Immersed liquid cooling charging system and control method thereof

Abstract

The invention discloses an immersed liquid cooling charging system and a control method thereof, the immersed liquid cooling charging system comprises a cabinet, a plurality of power modules, a radiator, a circulation pipeline, a circulation pump, a valve and a cooling fan, and the cabinet is provided with a top plate and a bottom plate which are oppositely arranged in the height direction of the cabinet; the plurality of power modules are arranged in the cabinet; the radiator is arranged in the cabinet and is located between the power module and the top plate; the circulation pipeline is communicated with the radiator and each power module; the circulating pump is arranged on the circulating pipeline; and the cooling fan is arranged on the top plate. According to the immersed liquid cooling charging system provided by the invention, the power module is directly communicated with the radiator through the circulating pipeline, a scheme that a cold plate is in contact with an internal device of the power module is not needed, a cold plate flow channel does not need to be designed and arranged, and the use is more convenient; meanwhile, all heating devices and circuits in the power module are soaked in insulation, so that heat dissipation is more direct and effective; and oxygen is isolated from being in contact with a heating device and a circuit, so that the safety is higher.

Description

Technical Field

[0001] The present application relates to the technical field of charging systems, and in particular to an immersion liquid-cooled charging system and a control method thereof. Background Art

[0002] With the rapid development of new energy vehicles, the demand for high-power, high-current fast charging is becoming more and more urgent, and the heat dissipation requirements of high-power, high-current charging equipment are relatively high.

[0003] Currently, the high-power liquid-cooled charging equipment on the market mainly installs a cold plate liquid-cooled power module inside the charging equipment cabinet. The cold plate liquid-cooled power module is a power module with a cold plate installed inside. A liquid-to-air radiator is installed on the top of the charging equipment cabinet. The cold plate and the radiator are connected by pipes. The cooling medium flows horizontally in the liquid-to-air radiator. The cooling medium is usually a mixture of pure water and ethylene glycol antifreeze.

[0004] However, in the above-mentioned charging equipment solution using a cold plate liquid-cooled power module, the flow channel of the cooling medium in the cold plate must pass through the areas where all heat-generating components and high-temperature-sensitive components are located in the power module to meet the heat dissipation requirements of the power module. The flow channel must also be designed and laid out based on the heat generation and temperature resistance of the components inside the power module to provide a suitable temperature environment for the components inside the power module. This results in a relatively complex overall design of the cold plate power module, a large power module size, and high product and maintenance costs for the charging equipment. Summary of the Invention

[0005] The main purpose of this application is to provide an immersion liquid-cooled charging system and a control method thereof, aiming to solve the problem of high cost and maintenance cost of traditional charging equipment products.

[0006] To achieve the above-mentioned purpose, the present application provides an immersion liquid-cooled charging system, which includes a cabinet, multiple power modules, a radiator, a circulation pipeline, a circulation pump, a valve and a cooling fan. The cabinet has a top plate and a bottom plate arranged relative to each other in its own height direction; multiple power modules are arranged inside the cabinet, and the power modules include a sealed shell and a PCBA assembly arranged inside the sealed shell, and the PCBA assembly includes power electronic devices and a control circuit; the radiator is arranged inside the cabinet and is located between the power module and the top plate, and the radiator includes a high-temperature side collector, a low-temperature side collector, and a cooling fan. A collecting pipe and multiple heat dissipation pipes, the high-temperature side collecting pipe is higher than the low-temperature side collecting pipe in the direction of gravity, and the multiple heat dissipation pipes are connected between the high-temperature side collecting pipe and the low-temperature side collecting pipe, and are arranged in sequence on the outer periphery of the high-temperature side collecting pipe along the axial direction of the high-temperature side collecting pipe, wherein the axial direction of the heat dissipation pipe has an angle with the horizontal plane; a circulation pipeline connects the radiator and each of the power modules; a circulation pump is arranged on the circulation pipeline; a valve and the circulation pump are connected in parallel on the circulation pipeline; a heat dissipation fan is arranged on the cabinet, and the air supply direction of the heat dissipation fan has an angle with the plane formed by the multiple heat dissipation pipes.

[0007] Optionally, the power module has a low-temperature oil inlet and a high-temperature oil outlet, the high-temperature oil outlet is higher than the low-temperature oil inlet in the direction of gravity, the radiator has a liquid inlet and a liquid outlet, the liquid inlet is arranged on the high-temperature side collecting pipe, and the liquid outlet is arranged on the low-temperature side collecting pipe; the circulation pipeline includes a high-temperature oil pipeline and a low-temperature oil pipeline, the high-temperature oil pipeline connects the high-temperature oil outlet of the power module and the liquid inlet of the radiator; the low-temperature oil pipeline connects the low-temperature oil inlet of the power module and the liquid outlet of the radiator; wherein, the circulation pump and the valve are both arranged on the low-temperature oil pipeline.

[0008] Optionally, the immersion liquid-cooled charging system further includes an expansion oil pot, which is arranged inside the cabinet and connected to the low-temperature oil pipeline. The expansion oil pot is located between the power module and the top plate and is arranged horizontally parallel to the radiator; wherein, on the low-temperature oil pipeline, the expansion oil pot is located between the circulation pump and the liquid outlet of the radiator.

[0009] Optionally, the immersion liquid-cooled charging system further includes a plurality of liquid level sensors, which are spaced apart on the inner side of the expansion oil pot in the height direction of the cabinet.

[0010] Optionally, the immersion liquid-cooled charging system further includes a filter, which is disposed in the expansion oil pot to filter the insulating oil entering the expansion oil pot.

[0011] Optionally, the immersion liquid-cooled charging system further includes a plurality of temperature and pressure sensors, which are respectively arranged at at least one of the three positions: in the power module, on the high-temperature oil pipeline, and on the low-temperature oil pipeline.

[0012] Optionally, the valve and the circulation pump form a power assembly, and there are two groups of power assemblies which are arranged in parallel on the circulation pipeline.

[0013] Optionally, the high-temperature side collecting pipe, the low-temperature side collecting pipe and multiple heat dissipation pipes form a heat dissipation module, and the radiator is composed of a heat dissipation assembly, and the heat dissipation assembly includes at least one heat dissipation module; wherein, when the heat dissipation assembly includes multiple heat dissipation modules, the multiple heat dissipation modules in the same heat dissipation assembly are arranged in sequence in the axial direction of the high-temperature side collecting pipe, the high-temperature side collecting pipes in adjacent heat dissipation modules are interconnected, and the low-temperature side collecting pipes in adjacent heat dissipation modules are interconnected.

[0014] Optionally, there are at least two groups of heat dissipation components, which are arranged in a horizontal direction perpendicular to the axial direction of the high-temperature side collecting pipe.

[0015] Optionally, there are two groups of heat dissipation components and there is an angle between the two groups of heat dissipation components.

[0016] Optionally, the radiator and the power module are both provided with connecting pipelines to connect the high-temperature oil pipeline and the low-temperature oil pipeline; wherein, at the connecting pipeline at the radiator, the connection position of the high-temperature oil pipeline and the connecting pipeline is the radiator front diverter pipe position interface, and the connection position of the low-temperature oil pipeline and the connecting pipeline is the radiator rear diverter pipe position interface, and the insulating oil flows from the radiator front diverter pipe position interface in sequence through the connecting pipeline, each of the heat dissipation modules, the connecting pipeline and reaches the radiator rear diverter pipe position When the interface is connected, the insulating oil flowing through different heat dissipation modules has the same length; at the connecting pipeline at the power module, the connection position of the high-temperature oil pipeline and the connecting pipeline is the module rear shunt pipe position interface, and the connection position of the low-temperature oil pipeline and the connecting pipeline is the module front shunt pipe position interface. When the insulating oil flows from the module front shunt pipe position interface in sequence through the connecting pipeline, each of the power modules, the connecting pipeline and reaches the module rear shunt pipe position interface, the insulating oil flowing through different power modules 2 has the same length.

[0017] In addition, to achieve the above-mentioned purpose, an embodiment of the present application also provides a control method for an immersion liquid-cooled charging system, which is applied to the above-mentioned immersion liquid-cooled charging system, wherein the immersion liquid-cooled charging system includes a controller, and the controller is electrically connected to a circulation pump and a heat dissipation fan. The method includes real-time acquisition of key parameters and preset conditions in the immersion liquid-cooled charging system, wherein the preset conditions include a first condition; judging whether the key parameters meet the first condition; if the key parameters meet the first condition, outputting a first control signal to the first mechanism and the second mechanism, wherein the first control signal is used to instruct the first mechanism and the second mechanism to shut down, the first mechanism is any one of the circulation pump and the heat dissipation fan, and the second mechanism is the other of the circulation pump and the heat dissipation fan, and the insulating oil in the circulation pipeline flows at a first flow rate.

[0018] Optionally, the preset conditions also include a second condition and a third condition, wherein the first condition to the third condition do not overlap with each other; after determining whether the key parameter meets the first condition, the method also includes determining whether the key parameter meets the second condition; determining whether the key parameter meets the third condition; if the key parameter meets the second condition, outputting a second control signal to the first mechanism and the second mechanism, the second control signal being used to instruct the first mechanism to operate in a low-power state and to instruct the second mechanism to shut down; if the key parameter meets the third condition, outputting a third control signal to the first mechanism and the second mechanism, the third control signal being used to instruct both the first mechanism and the second mechanism to operate in a low-power state.

[0019] Optionally, the preset conditions also include a fourth condition and a fifth condition, wherein the first condition to the fifth condition do not overlap with each other; after determining whether the key parameter meets the third condition, the method also includes determining whether the key parameter meets the fourth condition; determining whether the key parameter meets the fifth condition; if the key parameter meets the fourth condition, outputting a fourth control signal to the first mechanism and the second mechanism, the fourth control signal being used to instruct the first mechanism to operate in a high-power state and to instruct the second mechanism to operate in a low-power state; if the key parameter meets the fifth condition, outputting a fifth control signal to the first mechanism and the second mechanism, the fifth control signal being used to instruct both the first mechanism and the second mechanism to operate in a high-power state.

[0020] Optionally, the key parameters are any one or more of the circulation pipeline temperature value, the radiator temperature value, the power module temperature value, the liquid flow rate value in the radiator, the charging system power value, and the charging system current value.

[0021] An immersion liquid-cooled charging system proposed in an embodiment of the present application has a power module directly connected to a radiator through a circulation pipeline, and the cooling medium is insulating oil. Driven by a circulation pump, the insulating oil flows through the interior of the power module and the interior of the radiator, and brings the heat generated by the internal components of the power module to the radiator, where the heat dissipation fan dissipates the heat. There is no need to adopt a solution in which a cold plate contacts the internal components of the power module, so there is no need to design and layout a cold plate flow channel, which is more convenient to use and has lower cost. At the same time, all heating components and circuits in the power module are immersed in insulation, and all surfaces of the heating components and heating circuits are directly in contact with the insulating cooling oil, directly transferring heat to the insulating cooling oil, increasing the heat dissipation and heat transfer area of ​​the heating components and heating circuits, and making heat dissipation more direct and effective. In addition, the insulating oil completely isolates the possibility of oxygen contacting the heating components and circuits. When the components and circuits have quality problems such as aging themselves, high temperature or arcing is generated, which will be extinguished and cooled by the insulating oil. They are not exposed to oxygen and thus will not produce open flames, which is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the embodiments of the present invention. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other drawings based on the provided drawings without inventive effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented. Any structural modifications, changes in proportions, or adjustments in sizes should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and objectives that can be achieved by the present invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of an immersion liquid-cooled charging system proposed in an embodiment of the present application; Figure 2 for Figure 1 A schematic diagram of the structural disassembly of the embodiment; Figure 3 for Figure 1 Schematic diagram of the internal structure of the embodiment; Figure 4 This is a schematic diagram of the structure of the radiator in the embodiment of the present application. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the radiator in the embodiment of the present application. Figure 2 ; Figure 6 Figure 5Another perspective structural diagram of the embodiment; Figure 7 This is a schematic diagram of the insulating oil circulation path in the embodiment of the present application; Figure 8 This is a simplified diagram of the internal structure of the cabinet in the embodiment of this application; Figure 9 Schematic diagram of the heat dissipation module arrangement structure in the embodiment of this application Figure 1 ; Figure 10 Schematic diagram of the heat dissipation module arrangement structure in the embodiment of this application Figure 2 ; Figure 11 This is a flow chart of a control method for an immersion liquid-cooled charging system proposed in an embodiment of the present application.

[0025] In the figure: 1. Cabinet; 11. Temperature and pressure sensor; 2. Power module; 3. Radiator; 31. High-temperature side manifold; 32. Low-temperature side manifold; 33. Heat dissipation pipe; 4. Circulation pipeline; 41. High-temperature oil pipeline; 42. Low-temperature oil pipeline; 5. Circulation pump; 6. Expansion oil tank; 61. Liquid level sensor; 7. Valve; 8. Cooling fan; 91. Radiator front manifold; 92. Radiator rear manifold; 93. Diversion bend pipe; 94. Middle manifold.

[0026] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a schematic diagram of the overall structure of an immersion liquid-cooled charging system proposed in an embodiment of the present application; Figure 2 for Figure 1 A schematic diagram of the structural disassembly of the embodiment; Figure 3 for Figure 1 Schematic diagram of the internal structure of the embodiment; Figure 4 This is a schematic diagram of the structure of the radiator in the embodiment of the present application. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the radiator in the embodiment of the present application. Figure 2 ; Figure 6 Figure 5 Another perspective structural diagram of the embodiment; Figure 7 This is a schematic diagram of the insulating oil circulation path in the embodiment of the present application; Figure 8 This is a simplified diagram of the internal structure of the cabinet in the embodiment of this application; Figure 9 Schematic diagram of the heat dissipation module arrangement structure in the embodiment of this application Figure 1 ; Figure 10 Schematic diagram of the heat dissipation module arrangement structure in the embodiment of this application Figure 2 ; Figure 11This is a flow chart of a control method for an immersion liquid-cooled charging system proposed in an embodiment of the present application.

[0033] in, Figure 7 The black arrow in the middle indicates the flow direction of the insulating oil. The green part of the pipeline is the low-temperature pipeline, and the red part of the pipeline is the high-temperature pipeline.

[0034] refer to Figures 1 to 7 , it should be understood that Figure 2 The connections between the components should be like Figure 1 As compact as in the example, this is just an example. Figure 2 Some components are disassembled and displayed for easy understanding. The embodiment of the present application provides an immersion liquid-cooled charging system, which may include a cabinet 1, multiple power modules 2, a radiator 3, a circulation pipeline 4, a circulation pump 5, a valve 7 and a heat dissipation fan 8. The cabinet 1 has a top plate and a bottom plate arranged relative to each other in its own height direction; multiple power modules 2 are arranged inside the cabinet 1, and the power module 2 includes a sealed shell and a PCBA assembly arranged inside the sealed shell. The PCBA assembly includes power electronic devices and a control circuit; the radiator 3 is arranged inside the cabinet 1 and is located between the power module 2 and the top plate. The radiator 3 includes a high-temperature side collecting pipe 3 1. A low-temperature side manifold 32 and multiple heat dissipation tubes 33. The high-temperature side manifold 31 is higher than the low-temperature side manifold 32 in the direction of gravity. The multiple heat dissipation tubes 33 are connected between the high-temperature side manifold 31 and the low-temperature side manifold 32, and are arranged in sequence on the outer periphery of the high-temperature side manifold 31 along the axial direction of the high-temperature side manifold 31. The axial direction of the heat dissipation tube 33 forms an angle with the horizontal plane. A circulation pipeline 4 connects the radiator 3 and each power module 2. A circulation pump 5 is provided on the circulation pipeline 4. A valve 7 is connected to the circulation pump 5 in parallel on the circulation pipeline 4. A heat dissipation fan 8 is provided on the cabinet 1, and the air supply direction of the heat dissipation fan 8 forms an angle with the plane formed by the multiple heat dissipation tubes 33.

[0035] In an embodiment of the present application, an immersion-type liquid-cooled charging system is proposed. The power module 2 is directly connected to the radiator 3 through a circulation pipe 4. The cooling medium is insulating oil. Driven by a circulation pump 5, the insulating oil flows through the interior of the power module 2 and the interior of the radiator 3, and brings the heat generated by the components inside the power module 2 to the radiator 3. The heat dissipation fan 8 dissipates heat from the radiator 3. There is no need to adopt a solution in which a cold plate contacts the internal components of the power module 2, so there is no need to design and layout a cold plate flow channel, which is more convenient to use and lowers the cost. At the same time, all heating components and circuits in the power module 2 are immersed in insulation. All surfaces of the heating components and heating circuits are in direct contact with the insulating cooling oil, directly transferring heat to the insulating cooling oil, increasing the heat dissipation and heat transfer area of ​​the heating components and heating circuits, and dissipating heat more directly and effectively. In addition, the insulating oil completely isolates the possibility of oxygen contacting the heating components and circuits. When the components and circuits have quality problems such as aging, high temperature or arcing is generated, the arc is extinguished and cooled by the insulating oil. The lack of contact with oxygen will not produce open flames, which is safer.

[0036] It should be understood that the cabinet 1 is usually placed on a plane when in use, so that the height direction of the cabinet 1 is the same as the direction of gravity. The bottom plate and the top plate are two plates of the cabinet 1 arranged opposite to each other in the direction of gravity, and the top plate is located above the bottom plate.

[0037] In addition, the circulation pump 5 can be a gear pump; the specific arrangement of the multiple power modules 2 is not limited here, and they can be distributed in an array in the horizontal direction, in an array in space, or in other arrangements; the area where the multiple power modules 2 are located can be recorded as the heating area, and the area where the radiator 3 is located can be recorded as the heat dissipation area. To facilitate the installation of the radiator 3, a partition can be added between the heating area and the heat dissipation area to install the radiator 3 on the partition; of course, the partition should also be provided with holes for the circulation pipe 4 to pass through.

[0038] Among them, the air supply path of the heat dissipation fan 8 refers to the flow path of the wind blown out by the heat dissipation fan 8. The heat dissipation fan 8 is often provided with blades rotating around a fixed axis to blow air. Usually, the air supply path is the same as the axial direction of the fixed axis, that is, the air supply path of the heat dissipation fan 8 can be changed by adjusting the axial direction of the fixed axis; and the air supply direction of the heat dissipation fan 8 has an angle with the plane formed by the multiple heat dissipation pipes 33. It can be understood that there is an angle between the axial direction of the fixed axis in the heat dissipation fan 8 and the plane formed by the multiple heat dissipation pipes 33, so that the wind flow blown out by the heat dissipation fan 8 can directly blow the heat dissipation pipe 33. In the embodiment of the present application, Figure 2 and Figure 3As shown, the heat dissipation fan 8 can be set through the top plate, and the air supply direction of the heat dissipation fan 8 is the same as the height direction of the cabinet 1. In this way, when the two heat dissipation components are arranged at a "V"-shaped angle (which will be explained later), the heat dissipation fan 8 located at the top plate (that is, located above the "V" shape) blows the air downward, making it easier for the heat dissipation fan 8 to blow the air to each heat dissipation pipe 3 in the two heat dissipation components, thereby achieving a maximum air supply area and a better heat dissipation effect.

[0039] It should be noted that the angle between the axial direction of the heat pipe 33 and the horizontal plane means that the angle between the axial direction of the heat pipe 33 and the horizontal plane is greater than 0° and less than or equal to 90°. If the angle between the heat pipe 33 and the horizontal plane is too large, for example 90°, then if the heat dissipation fan 8 is set on the top plate to blow air vertically downward, the air supply path is parallel to the axial direction of the heat dissipation tube 33, the contact area between the airflow and the heat dissipation tube 33 is too small, and the airflow does not directly blow onto the heat dissipation tube 33, resulting in poor heat dissipation effect. In this case, the air supply direction of the heat dissipation fan 8 can be adjusted so that the air supply direction of the heat dissipation fan 8 has a larger angle with the plane formed by the multiple heat dissipation tubes 33 as much as possible. In this way, the contact area between the airflow blown by the heat dissipation fan 8 and the heat dissipation tube 33 is increased, and the airflow blows directly onto the heat dissipation tube 33, thereby improving the heat dissipation effect. Of course, if the angle between the heat pipe 33 and the horizontal plane is too large, for example 90°, the heat dissipation fan 8 can be set on the side wall of the cabinet 1, so that the heat dissipation fan 8 and the radiator 3 are parallel in the horizontal direction, and the air supply direction of the heat dissipation fan 8 is perpendicular to the plane formed by the multiple heat dissipation tubes 33, so that the air flow blown by the heat dissipation fan 8 blows directly into the heat dissipation tube 33, and the heat dissipation effect is also better. However, this solution of setting the heat dissipation fan 8 on the side wall of the cabinet 1 is only applicable to the case of one group of heat dissipation components. In the case of multiple groups of heat dissipation components, the heat dissipation components away from the heat dissipation fan 8 are subject to small air flow and poor heat dissipation effect.

[0040] Furthermore, ventilation holes may be provided on the side wall of the cabinet 1 at the heat dissipation area to improve the heat dissipation effect of the radiator 3 .

[0041] It should be noted that power module 2 is a fully submerged power module, primarily consisting of a sealed housing and a PCBA assembly. The sealed housing forms a completely enclosed cavity, preventing leakage of insulating oil. The PCBA assembly contains power electronics and control circuits, all of which are immersed in insulating oil for direct heat dissipation.

[0042] The operating principle of power module 2 is as follows: When power module 2 is in operation, the heat generated by the power components is directly absorbed by the surrounding insulating oil, causing the insulating oil temperature to gradually rise. A built-in temperature detection device collects real-time temperature data from the insulating coolant. When the temperature reaches a certain threshold, the charging system controller activates an external cooling system, such as a circulating pump 5. At this point, the hot insulating oil is pumped out of the power module 2 cavity, and the cooler insulating oil, treated by the external cooling system, is injected back into the cavity, forming a closed-loop heat exchange loop.

[0043] Among them, the power module 2 generates heat during operation, and the density of the insulating oil decreases after absorbing the heat. The insulating oil naturally flows upward into the high-temperature side manifold 31 due to its volume expansion at high temperature, and flows evenly into each heat dissipation tube 33 for heat dissipation. Each heat dissipation tube 33 has an angle with the horizontal plane. The cooling medium flowing into the heat dissipation tube 33 will converge in the low-temperature side manifold 32 and flow back to the power module 2 to continue to cool the power module 2. In this way, the insulating oil can achieve natural convection and circulation heat dissipation during operation, and heat dissipation can be achieved without the operation of the circulating pump 5, which is lower in cost and more convenient in maintenance.

[0044] It should be understood that the valve 7 can be a one-way valve. When the insulating oil circulates naturally in the circulation pipeline 4 to dissipate heat, since the gears in the circulation pump 5 are in a meshing state, the flow rate and pressure of the insulating oil that circulates naturally due to thermal expansion and contraction are low, and the insulating oil will be blocked by the meshing gears in the cavity of the circulation pump 5. At this time, the pressure of the insulating oil flow will push open the flap in the one-way valve to pass through the one-way valve, thereby realizing the natural circulation and convection heat dissipation of the insulating oil between the circulation pipeline 4 and the radiator 3 and the power module 2, without starting the circulation pump 5, effectively improving the service life of the circulation pump 5, and reducing the heat dissipation cost of the charging system.

[0045] It should be noted that the high-temperature side manifold 31 is located between the low-temperature side manifold 32 and the top plate, and there is an angle between the axial direction of the heat dissipation pipe 33 and the horizontal plane. In this way, when the insulating oil flows from the high-temperature side manifold 31 to the low-temperature side manifold 32, it flows obliquely downward, and the flow is smoother, which facilitates the natural convection of the insulating oil.

[0046] It should be noted that in this application, the insulating oil can be a liquid with a large thermal expansion coefficient. The larger the thermal expansion coefficient, the greater the volume expansion of the insulating oil after absorbing the same amount of heat, the faster the flow rate of the insulating oil in the radiator 3, and the better the heat dissipation effect.

[0047] For example, in an embodiment of the present application, the insulating oil can be an insulating oil with a thermal expansion coefficient of 5% per 60-degree temperature difference. Of course, a mineral oil-based insulating oil with a thermal expansion coefficient of 0.07% to 0.1% per degree Celsius, such as transformer oil, can also be used; or silicone oil or synthetic ester insulating oil with a thermal expansion coefficient of 0.1% to 0.12% per degree Celsius can be used.

[0048] Furthermore, the flow rate of the cooling medium is also related to the viscosity. The higher the temperature of the insulating oil used in this application, the lower the viscosity, thereby making the flow resistance of the insulating oil smaller; the insulating oil has the characteristics of upward heat transfer, the heated oil naturally convects upward, and the cooled oil naturally convects downward, thereby achieving, in a low-temperature environment, the heat power consumption generated during the operation of the power module 2 is used to heat the insulating oil, the heated insulating oil fluid naturally convects upward, and the low-temperature insulating oil fluid after heat dissipation by the radiator 3 flows naturally downward, thereby realizing natural convection of the insulating oil in the charging system and circulating heat dissipation, and there is no need for the circulating pump 5 to work.

[0049] It should be understood that the axial horizontal arrangement of the high-temperature side header 31 allows the insulating oil entering the high-temperature side header 31 to flow more evenly into the heat dissipation tubes 33 for heat dissipation.

[0050] In addition, when using the radiator 3, the high-temperature side manifold 31 is higher than the low-temperature side manifold 32 in the direction of gravity, so that the insulating oil in the heat dissipation tube 33 flows from top to bottom. In this way, when the charging system is height-restricted, the number of heat dissipation tubes 33 can be increased in the horizontal direction to meet the heat dissipation requirements of the high-power charging system without increasing the length of a single heat dissipation tube 33. The flow resistance of the insulating oil is lower and the flow is smoother, thereby increasing the flow rate of the insulating oil, improving the insulating oil flow rate, and further enhancing the heat dissipation effect.

[0051] It should be noted that conventional heat pipes have a longer path. When the insulating oil enters the front end of the heat pipe, the insulating oil temperature is higher, with a larger temperature difference from the outside, resulting in better heat dissipation. However, when the insulating oil enters the rear end of the heat pipe, the insulating oil temperature becomes lower, with a smaller temperature difference from the outside, resulting in poor heat dissipation and greater flow resistance. In the embodiment of the present application, the heat pipe 33 has a shorter path. When the insulating oil flows to the outlet of the low-temperature side manifold 32, there is still a certain temperature difference between the insulating oil and the ambient temperature. This results in a higher temperature of the insulating oil in the heat pipe 33, with a constant larger temperature difference from the outside, resulting in better heat dissipation. This results in a lower flow resistance and higher flow rate for the insulating oil flowing in the heat pipe 33, further increasing the flow rate of the insulating oil and thereby improving the heat dissipation efficiency of the radiator 3.

[0052] In an exemplary embodiment, the axial direction of the heat dissipation tube 33 is perpendicular to the axial direction of the high-temperature side manifold 31, and the axial direction of the low-temperature side manifold 32 is parallel to the axial direction of the high-temperature side manifold 31. In this way, when the total flow of multiple heat dissipation tubes 33 remains unchanged, the arrangement of the heat dissipation tube 33, the high-temperature side manifold 31 and the low-temperature side manifold 32 is closer, and the space occupied is smaller; the low-temperature side manifold 32 is parallel to the high-temperature side manifold 31, so that the lengths of each heat dissipation tube 33 are the same, so that the heat dissipation effect of the insulating oil in different heat dissipation tubes 33 is similar, and the heat dissipation is more uniform.

[0053] In an exemplary embodiment, the heat dissipation pipe 33 is a flat pipe. The cross section of the heat dissipation pipe 33 perpendicular to its own axis is rectangular. The rectangle has a long side and a short side. The direction of the short side is parallel to the axis of the high-temperature side header 31 .

[0054] Specifically, in the traditional solution, the heat dissipation pipes of the radiator are mostly circular pipes. Compared with the circular pipes, the flat pipes can be arranged more densely, thereby increasing the total flow of the multiple heat dissipation pipes 33 in the radiator 3, thereby improving the heat dissipation efficiency.

[0055] Furthermore, the direction of the short side is parallel to the axial direction of the high-temperature side collecting pipe 31. The direction of the short side can be understood as the thickness direction of the flat tube, and the arrangement of the multiple heat dissipation tubes 33 can be understood as the multiple heat dissipation tubes 33 being stacked in sequence in their own thickness direction. In this way, on the one hand, a denser arrangement of the heat dissipation tubes 33 can be achieved, and on the other hand, the heat dissipation tubes 33 can be extended in the direction of the long side, that is, the length of the long side of the rectangle is increased, thereby increasing the area of ​​the rectangle, and further increasing the flow rate of the heat dissipation tubes 33 to improve the heat dissipation effect.

[0056] In an exemplary embodiment, the included angle between the axial direction of the heat dissipation pipe 33 and the horizontal plane is n, and 40°≤n≤60°.

[0057] Specifically, when the radiator 3 is installed on the top of the cabinet 1, the heat dissipation pipe 33 can be arranged vertically in the cabinet 1, that is, the angle between the heat dissipation pipe 33 and the horizontal plane is 90°. In a preferred embodiment, under the trend of small volume of the charging system, the heat dissipation pipe 33 is arranged obliquely, that is, there is an angle between the heat dissipation pipe 33 and the horizontal plane. The angle between the heat dissipation pipe 33 and the horizontal plane is greater than 0° and less than 90°, for example, it can be 30°, 60°, 90°, etc., wherein the angle between the axial direction of the heat dissipation pipe 33 and the horizontal plane can be further specified to 40°~50°, for example, it can be 40°, 43°, 45°, 47°, 50°, etc. At this time, a height difference is formed at both ends of the heat dissipation pipe 33, which is not only conducive to the natural flow of insulating oil, but also makes the overall height occupied by the radiator 3 smaller.

[0058] refer to Figure 7 In an exemplary embodiment, the power module 2 has a low-temperature oil inlet and a high-temperature oil outlet, and the high-temperature oil outlet is higher than the low-temperature oil inlet in the direction of gravity. The radiator 3 has a liquid inlet and a liquid outlet, the liquid inlet is arranged on the high-temperature side manifold 31, and the liquid outlet is arranged on the low-temperature side manifold 32; the circulation pipeline 4 may include a high-temperature oil pipeline 41 and a low-temperature oil pipeline 42, the high-temperature oil pipeline 41 connects the high-temperature oil outlet of the power module 2 and the liquid inlet of the radiator 3; the low-temperature oil pipeline 42 connects the low-temperature oil inlet of the power module 2 and the liquid outlet of the radiator 3; wherein, the circulation pump 5 and the valve 7 are both arranged on the low-temperature oil pipeline 42.

[0059] Specifically, temperature detection devices are installed at both the high-temperature oil outlet and the low-temperature oil inlet of power module 2. These devices interact in real time with an external cooling control system via communication protocols such as CAN, 485, or 232 to control the circulation of the insulating oil. Specially designed check structures are used at both the high-temperature oil outlet and the low-temperature oil inlet to effectively prevent backflow of the insulating coolant and ensure unidirectional circulation.

[0060] It should be understood that the high-temperature oil outlet is used for the insulating oil to flow out of the power module 2 and flow into the high-temperature oil pipeline 41, and the low-temperature oil inlet is used for the insulating oil in the low-temperature oil pipeline 42 to flow into the power module 2. Since the insulating oil will take away the heat of the heating components or heating circuits inside the power module 2 when it is in the power module 2, the temperature of the insulating oil in the low-temperature oil pipeline 42 is lower than the temperature of the insulating oil in the high-temperature oil pipeline 41. Therefore, setting the circulating pump 5 on the low-temperature oil pipeline 42 can prevent the high temperature from damaging the circulating pump 5, thereby effectively improving the service life of the circulating pump 5.

[0061] At the same time, the circulating pump 5 is arranged at the low-temperature oil pipeline 42 to increase the pressure at the low-temperature oil pipeline 42, making it easier to press the low-temperature insulating oil into the power module 2 to dissipate heat from the power module 2.

[0062] Furthermore, in the height direction of the cabinet 1, the high-temperature oil outlet is above the low-temperature oil inlet, so that the high-temperature insulating oil in the power module 2 expands and rises and flows out from the high-temperature oil outlet. The flow process is more reasonable and smooth, and the insulating oil at the high-temperature oil outlet will not repeatedly cross the insulating oil at the low-temperature oil inlet, further increasing the temperature difference and density difference between the insulating oil in the low-temperature oil pipeline 42 and the insulating oil in the high-temperature oil pipeline 41, which is more convenient for the natural circulation convection of the insulating oil (the natural circulation convection of the insulating oil will be explained later); of course, the viscosity of the insulating oil decreases as the temperature increases, so that the flow resistance of the insulating oil is lower, which is also beneficial for the circulating pump 5 to drive the insulating oil to circulate and dissipate heat.

[0063] If the high-temperature oil outlet is located below the low-temperature oil inlet, the insulating oil at the high-temperature oil outlet in the power module 2 expands and rises, repeatedly crossing the insulating oil at the low-temperature oil inlet, affecting the heat dissipation effect.

[0064] Furthermore, the valve 7 is connected in parallel with the circulation pump 5 on the low-temperature oil pipeline 42; in a low-temperature environment, when the power module 2 generates heat, the thermal expansion and contraction characteristics of the insulating oil itself can be used to dissipate heat. Specifically, the insulating oil in the power module 2 expands due to the heat and enters the high-temperature oil pipeline 41. The insulating oil in the high-temperature oil pipeline 41 has a high temperature, and the density of the insulating oil decreases, so it floats up and flows into the high-temperature side collecting pipe 31 of the radiator 3; the insulating oil in the low-temperature oil pipeline 42 has a low temperature, and the density of the insulating oil increases, so it sinks and flows. In the charging system, the insulating oil dissipates heat through natural circulation convection in the circulation pipeline 4. The greater the temperature difference between the high-temperature oil pipeline 41 and the low-temperature oil pipeline 42 in the charging system, the greater the natural circulation flow and pressure generated by the insulating oil in the charging system.

[0065] It should be understood that when the controller of the charging system monitors that the temperature value of the highest temperature device in any power module 2 in the system or the temperature value of the insulating oil in the module exceeds the set threshold, the circulating pump 5 can be controlled to start running, and a negative pressure will be formed in the front end pipe of the liquid inlet of the circulating pump 5, and a positive pressure fluid will be formed in the pipeline at the rear end of the liquid outlet of the circulating pump 5 to push the flap of the one-way valve to close, so that the insulating oil can only pass through the circulating pump 5 and cannot pass through the one-way valve, that is, the circulating pump 5 drives the insulating oil to circulate to dissipate heat for the power module 2, which is more effective.

[0066] It should be noted that when the circulating pump 5 is used to drive the insulating oil to circulate and dissipate heat, heat dissipation can be performed normally regardless of whether the environment is low temperature or not.

[0067] Furthermore, the valve 7 can also directly adopt a solenoid valve or an electric valve. When it is necessary to utilize the natural circulation flow formed by the temperature difference and density difference of the insulating oil in the high-temperature oil pipeline 41 and the low-temperature oil pipeline 42 to dissipate heat, the valve 7 is controlled to be open and the gear circulation pump 5 is not started; when it is necessary to start the circulation pump 5 to drive the insulating oil to circulate and dissipate heat, the valve 7 is controlled to be closed and the circulation pump 5 is started.

[0068] In the exemplary embodiment, the valve 7 and the circulation pump 5 form a set of power components, and there are two sets of power components that are arranged in parallel on the circulation pipeline 4.

[0069] It should be understood that the power assembly can be set on the low-temperature oil pipeline 42. When two groups of power assemblies are set in parallel on the low-temperature oil pipeline 42, only the circulation pump 5 in one group of power assemblies will work at the same time. When a circulation pump 5 fails or is damaged, the circulation pump 5 in the other power assembly can be used to continue to provide circulation power for the insulating oil.

[0070] Furthermore, if the valve 7 adopts a one-way valve, when it is necessary to utilize the natural circulation flow formed by the temperature difference and density difference of the insulating oil in the high-temperature oil pipeline 41 and the low-temperature oil pipeline 42 to dissipate heat, the two circulation pumps 5 are both closed, and the insulating oil can flow through one of the two valves 7 or flow through both valves 7 at the same time. When it is necessary to start the circulation pump 5 to drive the insulating oil to circulate and dissipate heat, one of the circulation pumps 5 is turned on, and a fluid with positive pressure will be formed in the pipeline at the rear end of the liquid outlet of the circulation pump 5 to push the flaps of the two one-way valves to close, so that the insulating oil can only pass through the circulation pump 5 and cannot pass through the one-way valve, that is, the circulating pump 5 drives the insulating oil to circulate to dissipate heat for the power module 2.

[0071] refer to Figure 3 and Figure 7 In an exemplary embodiment, the immersion liquid-cooled charging system may further include an expansion oil pot 6, which is arranged inside the cabinet 1 and connected to the low-temperature oil pipeline 42. The expansion oil pot 6 is located between the power module 2 and the top plate and is arranged horizontally parallel to the radiator 3; wherein, on the low-temperature oil pipeline 42, the expansion oil pot 6 is located between the circulation pump 5 and the liquid outlet of the radiator 3.

[0072] like Figure 3 As shown, the expansion oil pot 6 is also located in the top area of ​​the cabinet 1 and is arranged in parallel with the radiator 3. Specifically, the expansion oil pot 6 can be set at the end position of the high-temperature side header 31 of the radiator 3, so that the low-temperature side header 32 is connected to the side wall of the expansion oil pot 6, and it is convenient to lead out a pipeline from the bottom of the expansion oil pot 6 to connect each of the power modules 2.

[0073] Among them, insulating oil is added to the expansion oil pot 6, and the expansion oil pot 6 is set on the low-temperature oil pipeline 42 instead of the high-temperature oil pipeline 41, which can also prevent the high temperature from damaging the expansion oil pot 6 and effectively increase the service life of the expansion oil pot 6.

[0074] In addition, the expansion oil pot 6 is located between the circulation pump 5 and the liquid outlet of the radiator 3. When the circulation pump 5 is working, the expansion oil pot 6 can ensure that the circulation pump 5 can always pump insulating oil without idling, which affects the service life of the circulation pump 5.

[0075] At the same time, arranging the circulating pump 5 behind the expansion oil pot 6 on the low-temperature oil pipeline 42 can prevent the expansion oil pot 6 from being subjected to a large pressure from the circulating pump 5 and ensure that the expansion oil pot 6 will not be damaged or leaked.

[0076] Among them, the expansion oil tank 6 can effectively balance the pressure in the system. When the temperature of the insulating oil in the charging system rises and the volume increases, the insulating oil level in the expansion oil tank 6 rises. When the temperature of the insulating oil in the system drops and the volume shrinks, the insulating oil level in the expansion oil tank 6 drops. In addition, the mouth of the expansion oil tank 6 usually has a pressure relief cover to balance the internal pressure of the expansion oil tank 6. There are many existing solutions for the specific containment structure with a pressure relief structure, which will not be repeated here.

[0077] refer to Figure 7 In an exemplary embodiment, the immersion liquid-cooled charging system may further include a plurality of liquid level sensors 61 , which are spaced apart on the inner side of the expansion oil pot 6 in the height direction of the cabinet 1 .

[0078] In the embodiment of the present application, there are three liquid level sensors 61, which are respectively recorded as the first liquid level sensor 61, the second liquid level sensor 61 and the third liquid level sensor 61 from top to bottom. When the insulating oil temperature in the charging system is too high and begins to expand, so that the insulating oil level in the expansion oil tank 6 reaches or exceeds the first liquid level sensor 61, the circulation pump 5 and / or the cooling fan 8 can be turned on, or the power of the circulation pump 5 and / or the cooling fan 8 can be increased to reduce the temperature of the insulating oil in the charging system and prevent the insulating oil in the expansion oil tank 6 from overflowing.

[0079] Among them, Figure 7 As shown, Figure 7 The three black dots in the middle expansion oil pot 6 represent three liquid level sensors 61 .

[0080] When the insulating oil level in the expansion oil pot 6 is too low, lower than the third liquid level sensor 61, insulating oil can be added to the expansion oil pot 6 until the insulating oil level in the expansion oil pot 6 reaches the second liquid level sensor 61. The second liquid level sensor 61 cooperates with the third liquid level sensor 61 to perform automatic refueling. For example, when it is detected that the liquid level is lower than the first liquid level sensor 61, the refueling mechanism is started until the liquid level reaches the second liquid level sensor 61. Of course, automatic refueling is not protected by this application. This is only an example of a solution, so the refueling mechanism and the like will not be described in detail.

[0081] In an exemplary embodiment, the submerged liquid-cooled charging system may further include a filter, which is disposed in the oil expansion pot 6 to filter the insulating oil entering the oil expansion pot 6 .

[0082] Among them, the filter is arranged in the oil pot, so that the filter can filter the insulating oil when the expansion oil pot 6 is refueled. At the same time, the filter also filters the insulating oil from the radiator 3. In this way, the insulating oil that subsequently flows to the circulation pump 5 is all filtered insulating oil, which effectively intercepts impurities mixed in the insulating oil, prevents damage to the circulation pump 5, and effectively improves the service life of the circulation pump 5.

[0083] refer to Figure 7 In an exemplary embodiment, the immersion liquid-cooled charging system may further include a plurality of temperature and pressure sensors 11, which are respectively arranged at at least one of the three positions in the power module 2, on the high-temperature oil pipeline 41, and on the low-temperature oil pipeline 42.

[0084] It should be understood that the temperature and pressure sensor 11 can be used to detect the temperature and pressure of the insulating oil in the power module 2, the low-temperature oil pipeline 42 and the high-temperature oil pipeline 41; the temperature and pressure of the insulating oil in the low-temperature oil pipeline 42 are recorded as the first temperature and the first pressure, the temperature and pressure of the insulating oil in the high-temperature oil pipeline 41 are recorded as the second temperature and the second pressure, and the temperature and pressure of the insulating oil in the power module 2 are recorded as the third pressure.

[0085] In the embodiment of the present application, temperature and pressure sensors 11 are provided in the power module 2 , on the high-temperature oil pipeline 41 , and on the low-temperature oil pipeline 42 .

[0086] Among them, after the insulating oil passes through the power module 2, it will take away the internal heat of the power module 2, thereby increasing the temperature of the insulating oil, making the second temperature greater than the first temperature. In this way, the heat dissipation effect of the power module 2 can be judged by the difference between the second temperature and the first temperature.

[0087] Furthermore, the heat dissipation effect of the power module 2 can be judged based on the change in the difference between the second temperature and the first temperature of the circulating pump 5 at different powers, which is convenient for subsequent improvement of the charging system or prediction of the heat dissipation effect of such heat dissipation method.

[0088] In addition, whether the circulation pump 5 or the cooling fan 8 needs to be turned on for heat dissipation can also be determined based on the third temperature value. The specific determination method will be described later.

[0089] In addition, for the detected first pressure, second pressure and third pressure, the comparison results of the preset pressure ranges of the three pressures can be used to determine whether there is a leak or a blockage in the charging system; for example, taking the first pressure as an example, if the first pressure is within the corresponding preset pressure range, the charging system is working normally; if the first pressure is less than the minimum value within the corresponding preset pressure range, it indicates that there is a leak somewhere in the charging system, resulting in a decrease in the insulating oil pressure, and maintenance is required; if the first pressure is greater than the maximum value within the corresponding preset pressure range, it indicates that there is a blockage somewhere in the charging system, resulting in an increase in the insulating oil pressure, and maintenance is required; this effectively improves the safety performance of the charging system and enables timely maintenance and repairs.

[0090] refer to Figure 4In the exemplary embodiment, the high-temperature side header 31, the low-temperature side header 32 and the plurality of heat dissipation pipes 33 form a heat dissipation module, the radiator 3 is composed of a heat dissipation assembly, and the heat dissipation assembly includes at least one heat dissipation module; Among them, when the heat dissipation assembly includes multiple heat dissipation modules, the multiple heat dissipation modules in the same heat dissipation assembly are arranged in sequence in the axial direction of the high-temperature side collecting pipe 31, the high-temperature side collecting pipes 31 in adjacent heat dissipation modules are connected to each other, and the low-temperature side collecting pipes 32 in adjacent heat dissipation modules are connected to each other.

[0091] Specifically, the radiator 3 is modularized so that the heat dissipation component of the radiator 3 can be assembled from an indefinite number of heat dissipation modules. In this way, the heat dissipation modules can be disassembled and assembled in time according to the size of the charging device to adjust the size of the radiator 3 to adapt to the charging device. In addition, when a heat dissipation module fails, such as leaking, the individual heat dissipation modules can be disassembled for replacement and maintenance without replacing the entire radiator 3. Maintenance of the radiator 3 is more convenient, faster, and less costly.

[0092] Of course, the axial direction of the high-temperature side collecting pipe 31 is parallel to the horizontal plane. In this way, no matter how many heat dissipation modules are assembled in the same heat dissipation assembly, it will not affect the overall height of the charging device; the heat dissipation pipe 33 in the heat dissipation assembly here can also maintain an angle of 40° to 50° with the horizontal plane.

[0093] In the embodiment of the present application, there are three heat dissipation modules in the heat dissipation assembly.

[0094] refer to Figures 8 to 10 In an exemplary embodiment, there are at least two groups of heat dissipation components and they are arranged in a horizontal direction perpendicular to the axial direction of the high-temperature side header 31 .

[0095] The horizontal direction perpendicular to the axial direction of the high-temperature side header 31 is Figure 8 The horizontal direction in the figure can be recorded as the first direction, and multiple groups of heat dissipation components are arranged in the first direction, such as Figure 8 As shown, each heat dissipation component is parallel to each other and arranged vertically. The vertical arrangement means that the angle between the heat dissipation pipe 33 in the heat dissipation component and the horizontal plane is 90°; Figure 9 As shown, the heat dissipation components are also arranged parallel to each other, but the angle between each heat dissipation component and the horizontal plane is smaller than that of Figure 8 Make changes; such as Figure 10 As shown, the two groups of heat dissipation components on the left are parallel to each other, the two groups of heat dissipation components on the right are parallel to each other, and the two groups of heat dissipation components on the left are arranged at an angle to the two groups of heat dissipation components on the right.

[0096] It should be noted that at least two groups of heat dissipation components are a preferred arrangement scheme, and using only one group of heat dissipation components will not affect the normal use of the radiator 3.

[0097] In an exemplary embodiment, there are two groups of heat dissipation components, and an angle is formed between the two groups of heat dissipation components.

[0098] Among them, Figure 3 and Figure 5 As shown, the minimum distance between the high-temperature side headers 31 in the two groups of heat dissipation components is a, and the minimum distance between the low-temperature side headers 32 in the two groups of heat dissipation components is b, and a>b. Then, when the radiator 3 is installed on the top of the charging device, the two groups of heat dissipation components are arranged in a "V" shape; wherein, the angle between the heat dissipation pipe 33 and the horizontal plane can be 40°~50°, and the angle between the two groups of heat dissipation components arranged in a "V" shape can be 80°~100°. This not only meets the heat dissipation requirements of high-power charging equipment, but also reduces the overall height of the charging device.

[0099] In addition, if a<b, when the radiator 3 is installed on the top of the charging device, the two groups of heat dissipation components can be arranged in an inverted "V" shape.

[0100] It should be noted that the two groups of heat dissipation components arranged in a "V" shape can be fixedly connected. For example, a connecting plate can be welded to the outer periphery of the low-temperature side collecting pipe 32 or the high-temperature side collecting pipe 31 of the two groups of heat dissipation components, and a through hole is opened on the connecting plate. The two groups of heat dissipation components are fixed by passing bolts through the two connecting plates and pushing the two connecting plates to fit together. When the two connecting plates are fitted together, the two groups of heat dissipation components are in a "V" shape. There are many traditional solutions for fixing the two groups of heat dissipation components, which will not be repeated here.

[0101] It should be understood that the radiator 3 does not have to have only two sets of heat dissipation components. Among them, the arrangement direction of multiple sets of heat dissipation components is perpendicular to the arrangement direction of the heat dissipation modules in the heat dissipation components. Then, multiple sets of heat dissipation components can also be arranged in the corresponding direction to improve the heat dissipation effect. When in use, it is sufficient to ensure that the high-temperature side manifold 31 in each heat dissipation component is located above the low-temperature side manifold 32.

[0102] It should be noted that Figure 3 and Figure 5 The figure shows a case where both groups of heat dissipation components include three heat dissipation modules. This is only an exemplary description. For example, both groups of heat dissipation components may also include one heat dissipation module. In this way, the two heat dissipation modules can be arranged in the above-mentioned "V" shape. Of course, the number of heat dissipation modules included in the two groups of heat dissipation components may also be different. For example, one heat dissipation component may include one heat dissipation module, and the other heat dissipation component may include three heat dissipation modules, and so on. There are many specific arrangement schemes, which will not be described here one by one.

[0103] In an embodiment of the present application, for a low-power charging system (for example, below 120KW), only a single heat dissipation module can be used in the system, that is, only one heat dissipation component is provided, and the heat dissipation component contains only one heat dissipation module. For a charging system with a power of 360KW, two heat dissipation modules can be used for heat dissipation, and the two heat dissipation modules can be arranged in a "V" shape, that is, two groups of heat dissipation components arranged at an angle are provided, and each heat dissipation component contains only one heat dissipation module, so that the heat dissipation fan 8 provided on the top of the cabinet 1 can blow air to the two heat dissipation modules, and the two heat dissipation modules occupy less space. Furthermore, for a charging system with a power of 720KW, six heat dissipation modules can be used to form two groups of heat dissipation components arranged in a "V" shape, that is, the two groups of heat dissipation components are arranged at an angle, and each heat dissipation component contains three heat dissipation modules, such as Figure 3 As shown, the heat dissipation fan 8 arranged on the top of the cabinet 1 can blow air to the six heat dissipation modules, and the six heat dissipation modules occupy less space.

[0104] In an exemplary embodiment, the heat dissipation modules included in the two groups of heat dissipation assemblies correspond to each other one by one, and the corresponding heat dissipation modules share the low-temperature side header 32 .

[0105] Specifically, for ease of understanding, two corresponding heat dissipation modules are taken as an example for explanation. The two heat dissipation modules share a low-temperature side collecting pipe 32, and the high-temperature side collecting pipes 31 of the two heat dissipation modules are independent of each other. In this way, the two heat dissipation modules can naturally be arranged in a "V" shape, and more materials can be saved.

[0106] It should be understood that if a design of a shared low-temperature side manifold 32 is adopted, the two high-temperature side manifolds 31 of the two heat dissipation modules, multiple heat dissipation tubes 33 and one low-temperature side manifold 32 can be used to form a new heat dissipation module. The new heat dissipation modules can be arranged in sequence in the axial direction of the high-temperature side manifold 31. In the axial direction of the high-temperature side manifold 31, adjacent high-temperature side manifolds 31 are connected to each other, and adjacent low-temperature side manifolds 32 are connected to each other.

[0107] Of course, if the above-mentioned inverted “V”-shaped arrangement is adopted, the two heat dissipation modules can share the high-temperature side header 31 .

[0108] It should be noted that the “V” shape in the present application refers to the cross-sectional shape of the liquid-cooled radiator perpendicular to the axial direction of the high-temperature side header 1 .

[0109] refer to Figure 7In an exemplary embodiment, connecting pipes are provided on both the radiator 3 and the power module 2 to connect the high-temperature oil pipe 41 and the low-temperature oil pipe 42. In the connecting pipe on the radiator 3, the connection position of the high-temperature oil pipe 41 and the connecting pipe is the radiator front manifold position interface, and the connection position of the low-temperature oil pipe 42 and the connecting pipe is the radiator rear manifold position interface. When the insulating oil flows from the radiator front manifold position interface through the connecting pipe, each heat dissipation module, the connecting pipe, and reaches the radiator rear manifold position interface, the insulating oil flows through different heat dissipation modules with the same length. In the connecting pipe on the power module 2, the connection position of the high-temperature oil pipe 41 and the connecting pipe is the module rear manifold position interface, and the connection position of the low-temperature oil pipe 42 and the connecting pipe is the module front manifold position interface. When the insulating oil flows from the module front manifold position interface through the connecting pipe, each power module 2, the connecting pipe, and reaches the module rear manifold position interface, the insulating oil flows through different power modules with the same length.

[0110] like Figure 7 As shown, two sets of heat dissipation components are used here, and each heat dissipation component includes three heat dissipation modules. This is explained as an example. It should be understood that this is not a schematic diagram of the arrangement of the two sets of heat dissipation components, but only a schematic diagram to indicate the connection relationship of the pipeline. The specific heat dissipation components and the arrangement of the power module 2 can be referred to. Figure 3 .

[0111] Specifically, taking the connecting pipes at the radiator 3 as an example, the connecting pipes include a radiator front-end manifold 91, a radiator rear-end manifold 92, a diversion bending pipe 93 and an intermediate manifold 94. Each heat dissipation component has a radiator front-end manifold 91 connected to the liquid inlet of each heat dissipation module in the heat dissipation component through multiple diversion bending pipes 93. Each heat dissipation component also has a radiator rear-end manifold 92 connected to the liquid outlet of each heat dissipation module in the heat dissipation component through multiple diversion bending pipes 93, wherein the bending angle or structure of each diversion bending pipe 93 is the same.

[0112] Among them, when two sets of heat dissipation components are used, such as Figure 7 As shown, the high-temperature oil pipeline 41 is directly connected to the central area of ​​the two radiator front-end manifolds 91 that are close to each other, so that the high-temperature oil pipeline 41 is connected to the two radiator front-end manifolds 91 at the same time; the low-temperature oil pipeline 42 is connected to the ends of the two radiator rear-end manifolds 92 that are far away from each other through the intermediate manifold 94, and the low-temperature oil pipeline 42 is connected to the center of the intermediate manifold 94, so that the low-temperature oil pipeline 42 is connected to the two radiator rear-end manifolds 92 at the same time.

[0113] It should be understood that the ends close to each other and the ends far away from each other are only Figure 7 As shown in , in actual assembly, Figure 3If the two radiator front end manifolds 91 are placed close to each other Figure 3 The left end is considered as the end close to each other, and the two radiator rear end manifolds 92 are close to each other. Figure 3 The right end is regarded as the end moving away from each other.

[0114] The connection area between the high-temperature oil pipeline 41 and the two radiator front end manifolds 91 is recorded as the radiator front diverter pipe position interface, and the connection area between the low-temperature oil pipeline 42 and the intermediate manifold 94 is recorded as the radiator rear diverter pipe position interface. The insulating oil is diverted from the radiator front diverter pipe position interface and flows through each heat dissipation module and then converges at the radiator rear diverter pipe position interface. During the process, multiple insulating oils diverted from the radiator front diverter pipe position interface flow into different heat dissipation modules respectively until they converge at the radiator rear diverter pipe position interface. The length of the distance they flow through is consistent, so as to ensure that the fluid flow of the insulating oil flowing through each heat dissipation module is automatically distributed and highly consistent, and the balanced distribution of the insulating oil ensures that the heat dissipation capacity of each radiator and the heat dissipation effect of each power module 2 are consistent.

[0115] It should be noted that the above-mentioned insulating oil uniform distribution scheme can also be adopted at multiple power modules 2. The power module 2 is similar to the heat dissipation module. The high-temperature oil outlet of the power module 2 corresponds to the liquid outlet of the heat dissipation module, and the low-temperature oil inlet of the power module 2 corresponds to the liquid inlet of the heat dissipation module. The multiple power modules 2 arranged in parallel are regarded as heat dissipation components. In this way, the corresponding connecting pipelines can be arranged in the above-mentioned manner to achieve uniform distribution of insulating oil to each power module 2. The specific scheme will not be described in detail here. Figure 7 The middle power module 2 is shown as only a feasible pipe connection method, and is not the pipeline structure corresponding to the above-mentioned uniform flow distribution solution.

[0116] refer to Figure 5 and Figure 6 In an exemplary embodiment, both ends of the high-temperature side collecting pipe 31 and both ends of the low-temperature side collecting pipe 32 are open, and the liquid inlet and the liquid outlet are respectively arranged on the outer periphery of each high-temperature side collecting pipe 31 and each low-temperature side collecting pipe 32; the heat dissipation component can also include multiple covers and two collecting pipes, and the multiple covers are connected to the two ends of each high-temperature side collecting pipe 31 and the two ends of each low-temperature side collecting pipe 32 in a one-to-one manner; both collecting pipes are closed at one end and open at the other end, the outer periphery of one collecting pipe is connected to the liquid inlet on each high-temperature side collecting pipe 31; the outer periphery of the other collecting pipe is connected to the liquid outlet on each low-temperature side collecting pipe 32.

[0117] Among them, taking the high-temperature side collecting pipe 31 as an example, internal threads can be set at both ends of the high-temperature side collecting pipe 31, and external threads can be set on the outer periphery of the cover. In this way, the cover can seal both ends of the high-temperature side collecting pipe 31. At this time, the insulating oil heated in the power module 2 will first enter the corresponding collecting pipe and flow to the liquid inlet of each high-temperature side collecting pipe 31. The insulating oil flowing out from the liquid outlet of each low-temperature side collecting pipe 32 will also first enter the corresponding collecting pipe for convergence and then flow into the power module 2 to dissipate heat for the power module 2.

[0118] It should be understood that the axial direction of the manifold connected to the liquid inlet of the high-temperature side manifold 31 should be parallel to the horizontal plane, so that the oil can flow into each high-temperature side manifold 31 more evenly.

[0119] In an exemplary embodiment, both ends of the high-temperature side collecting pipe 31 and both ends of the low-temperature side collecting pipe 32 are open; the heat dissipation assembly may also include multiple transfer tubes and two covers, and the multiple transfer tubes are respectively connected between adjacent high-temperature side collecting pipes 31 and adjacent low-temperature side collecting pipes 32; one cover is connected to one end of a high-temperature side collecting pipe 31 where no transfer tube is provided; the other cover is connected to one end of a low-temperature side collecting pipe 32 where no transfer tube is provided.

[0120] Among them, taking the high-temperature side collecting pipe 31 as an example, internal threads can be set at both ends of the high-temperature side collecting pipe 31, one end of which can be used as the liquid inlet of the high-temperature side collecting pipe 31, and external threads can be set at both ends of the adapter tube, so that the adapter tube can be screwed into the adjacent high-temperature side collecting pipes 31 to connect the adjacent high-temperature side collecting pipes 31. At this time, the high-temperature side collecting pipes 31 that are connected to each other have only two open ends, and one end is sealed by the cover, so that the high-temperature side collecting pipes 31 that are connected to each other have only one open end as the liquid inlet to connect with the power module 2. The connection method of multiple low-temperature side collecting pipes 32 is the same, and it will not be repeated here.

[0121] In this way, the heated insulating oil in the power module 2 will first enter the liquid inlet of the interconnected high-temperature side collecting pipes 31, and flow through the heat dissipation pipes 33 in each heat dissipation module to the liquid outlet of the interconnected low-temperature side collecting pipes 32, and finally flow into the power module 2 to dissipate heat from the power module 2.

[0122] It should be understood that two connection methods are provided here. Taking the high-temperature side collecting pipe 31 as an example, the first method is that the high-temperature side collecting pipes 31 are connected to each other through a transfer pipe; the second method is that the high-temperature side collecting pipes 31 are independent of each other and converge through a confluence pipe, and the same is true for the low-temperature side collecting pipe 32; in the embodiment of the present application, the high-temperature side collecting pipe 31 and the low-temperature side collecting pipe 32 both adopt the second method of confluence through a confluence pipe.

[0123] It should be noted that the scheme of interconnecting the high-temperature side headers 31 and the scheme of interconnecting the low-temperature side headers 32 can be any one of the above two schemes.

[0124] It should be noted that the two manifolds here are the above-mentioned radiator front-end manifold 91 and radiator rear-end manifold 92. If the above-mentioned scheme of setting connecting pipes to evenly distribute the insulating oil is to be adopted, then only the high-temperature side manifolds 31 can be used here to be independent of each other and to converge through the manifolds. The same applies to the low-temperature side manifold 32.

[0125] refer to Figure 11 Based on the above embodiment, the present application also provides a control method for an immersion-type liquid-cooled charging system, which is applied to the above immersion-type liquid-cooled charging system. The immersion-type liquid-cooled charging system includes a controller, which is electrically connected to a circulation pump 5 and a cooling fan 8. The method may specifically include the following steps: S100, acquiring key parameters and preset conditions in the immersion liquid-cooled charging system in real time, wherein the preset conditions include a first condition; S200, determining whether the key parameter meets the first condition; S210. If the key parameters meet the first condition, a first control signal is output to the first mechanism and the second mechanism, wherein the first control signal is used to instruct the first mechanism and the second mechanism to shut down, the first mechanism is any one of the circulating pump 5 and the cooling fan 8, and the second mechanism is the other of the circulating pump 5 and the cooling fan 8, and the insulating oil in the circulation pipeline 4 flows at a first flow rate.

[0126] In step S100 , the key parameters may be any one or more of the circulation pipe temperature, the radiator temperature, the power module temperature, the liquid flow rate in the radiator, the charging system power, and the charging system current.

[0127] It should be understood that the key parameter may be one or more of the above parameters, which may be determined according to actual application conditions; each key parameter has a corresponding preset condition.

[0128] For example, if the key parameter is the power module temperature value, there will be a first condition corresponding to the power module temperature value. The first condition can be a temperature range. When the detected power module temperature value is within the temperature range corresponding to the first condition, it is considered that the detected power module temperature value meets the first condition.

[0129] At this time, the circulating pump 5 and the cooling fan 8 can be put into a shutdown state, and the insulating oil can be expanded by heat, thereby achieving natural convection in the circulation pipeline 4 to achieve heat dissipation of the power module 2. At this time, the flow rate of the insulating oil in the circulation pipeline 4 is the first flow rate, and the first flow rate is not zero at this time. The specific convection process of the insulating oil can refer to the introduction of the relevant natural convection in the above-mentioned immersion liquid-cooled charging system, which will not be repeated here.

[0130] In an exemplary embodiment, the preset conditions further include a second condition and a third condition, wherein the first condition to the third condition do not overlap with each other; after step S200, the method further includes: S300, determining whether the key parameter meets the second condition; S400, determining whether the key parameter meets the third condition; S310: If the key parameter satisfies the second condition, output a second control signal to the first mechanism and the second mechanism, wherein the second control signal is used to instruct the first mechanism to operate in a low-power state and to instruct the second mechanism to shut down; S410: If the key parameter satisfies a third condition, a third control signal is output to the first mechanism and the second mechanism, where the third control signal is used to instruct the first mechanism and the second mechanism to operate in a low power state.

[0131] In an exemplary embodiment, the preset conditions further include a fourth condition and a fifth condition, wherein the first to fifth conditions do not overlap with each other; after determining whether the key parameter satisfies the third condition, the method further includes: S500, determining whether the key parameters meet the fourth condition; S600, determining whether the key parameter meets the fifth condition; S510: If the key parameter satisfies a fourth condition, output a fourth control signal to the first mechanism and the second mechanism, where the fourth control signal is used to instruct the first mechanism to operate in a high-power state and to instruct the second mechanism to operate in a low-power state; S610: If the key parameter satisfies the fifth condition, output a fifth control signal to the first mechanism and the second mechanism, where the fifth control signal is used to instruct the first mechanism and the second mechanism to operate in a high power state.

[0132] It should be understood that, taking the key parameter as the power module temperature value as an example, the preset conditions include first to fifth conditions corresponding to the power module temperature value, and the first to fifth conditions are five successively increasing temperature ranges.

[0133] Taking the second condition and the first condition as an example, the successively increasing temperature ranges refer to that the minimum temperature value of the temperature range in the second condition is greater than or equal to the maximum temperature value of the first temperature range.

[0134] Furthermore, four successively increasing temperature thresholds may be defined, namely a first threshold to a fourth threshold, and a minimum initial threshold.

[0135] The first condition can be greater than the initial threshold and less than or equal to the first threshold; the second condition can be greater than the first threshold and less than or equal to the second threshold; the third condition can be greater than the second threshold and less than or equal to the third threshold; the fourth condition can be greater than the third threshold and less than or equal to the fourth threshold; the fifth condition can be greater than the fifth threshold; the power module temperature value will only meet one condition at the same time, that is, the first to fifth conditions do not overlap.

[0136] It should be understood that, from the working states of the circulation pump 5 and the cooling fan 8 corresponding to the first to fifth conditions, it can be seen that the heat dissipation effect increases progressively. In this way, the working states of the circulation pump 5 and the cooling fan 8 can be changed at any time according to the specific temperature value inside the power module 2 to achieve the frequency conversion effect, reduce energy waste, reduce cooling costs, and at the same time improve the service life of the circulation pump 5 and the cooling fan 8. Among them, the power module temperature value is the third temperature mentioned above, which is measured by the temperature and pressure sensor in the power module 2.

[0137] For ease of understanding, steps S210, S310, S410, S510, and S610 can be understood as five heat dissipation levels, ranging from level 1 to level 5. That is, the heat dissipation level of the charging system can be determined based on the comparison results of key parameters with preset conditions. For example, if the charging system power value meets the fourth condition, the heat dissipation level corresponding to the charging system power value is level 4.

[0138] It should be noted that the key parameters in the above content can be multiple parameters, in which case the heat dissipation level can be the maximum value; for example, when the key parameters are the charging system power value, the radiator temperature value, and the power module temperature value, if the heat dissipation level corresponding to the charging system power value is level one, and the heat dissipation levels corresponding to the radiator temperature value and the power module temperature value are both level two, then the charging system can be cooled according to the level two heat dissipation steps.

[0139] The following example uses the charging system power value as a key parameter. In this case, the five power thresholds corresponding to the first to fifth conditions are the initial threshold, the first threshold to the fourth threshold, which increase in sequence. The process of determining the charging system power value is as follows: comparing the charging system power value with an initial threshold and first to fourth thresholds; If the charging system power value is greater than the initial threshold and less than or equal to the first threshold, sending a first control signal to the first mechanism and the second mechanism; If the charging system power value is greater than the first threshold and less than or equal to the second threshold, sending a second control signal to the first mechanism and the second mechanism; If the charging system power value is greater than the second threshold and less than or equal to the third threshold, sending a third control signal to the first mechanism and the second mechanism; If the charging system power value is greater than the third threshold and less than or equal to the fourth threshold, sending a fourth control signal to the first mechanism and the second mechanism; If the charging system power value is greater than the fourth power threshold, a fifth control signal is sent to the first mechanism and the second mechanism.

[0140] Specifically, taking the first mechanism as the circulation pump 5 as an example, the power value of the charging system is obtained and compared in real time. Therefore, when the charging system just starts working, the power value of the charging system should be less than the initial threshold value. At this time, the temperature of the power module 2 is not high and no heat dissipation is required. When the charging system continues to work, the power value of the charging system is greater than the initial threshold value and less than or equal to the first power threshold value. At this time, the circulation pump 5 and the cooling fan 8 are both in standby state. At this time, the heat dissipation demand of the heat dissipation charging system can be met by natural convection of insulating oil, which saves costs and is more convenient. When the power value of the charging system gradually increases and is greater than the first threshold value and is less than or equal to the second threshold, the circulation pump 5 is turned on to drive the insulating oil circulation for heat dissipation; when the power value of the charging system is greater than the second threshold and less than or equal to the third threshold, the heat dissipation fan 8 can be turned on to speed up the heat dissipation of the radiator 3; when the power value of the charging system is greater than the third threshold and less than the fourth threshold, the power of the circulation pump 5 is increased to increase the flow rate of the insulating oil, thereby improving the heat dissipation effect; when the power value of the charging system is greater than the fourth power threshold, the power of the heat dissipation fan 8 can be increased to increase the speed of the heat dissipation fan 8, thereby improving the heat dissipation effect of the radiator 3, and further improving the heat dissipation effect of the power module 2.

[0141] The above are only preferred embodiments of the present application and do 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. An immersion liquid cooling charging system, characterized in that: include: The cabinet (1) has a top plate and a bottom plate arranged opposite to each other in its own height direction; A plurality of power modules (2) are all arranged inside the cabinet (1), the power modules (2) comprising a sealed housing and a PCBA assembly arranged inside the sealed housing, the PCBA assembly comprising a power electronic device and a control circuit; A radiator (3) is arranged inside the cabinet (1) and between the power module (2) and the top plate, the radiator (3) comprising a high-temperature side header (31), a low-temperature side header (32) and a plurality of heat dissipation pipes (33), the high-temperature side header (31) being higher than the low-temperature side header (32) in the direction of gravity, the plurality of heat dissipation pipes (33) being connected between the high-temperature side header (31) and the low-temperature side header (32), and being sequentially arranged on the outer periphery of the high-temperature side header (31) along the axial direction of the high-temperature side header (31), wherein an angle is formed between the axial direction of the heat dissipation pipe (33) and a horizontal plane; A circulation pipeline (4) connecting the radiator (3) and each of the power modules (2); A circulation pump (5) is provided on the circulation pipeline (4); A valve (7) is connected in parallel with the circulation pump (5) on the circulation pipeline (4); A heat dissipation fan (8) is provided on the cabinet (1), and an angle is formed between the air supply direction of the heat dissipation fan (8) and the plane formed by the plurality of heat dissipation pipes (33).

2. The immersion liquid cooling charging system according to claim 1, characterized in that: The power module (2) has a low-temperature oil inlet and a high-temperature oil outlet, the high-temperature oil outlet being higher than the low-temperature oil inlet in the direction of gravity, the radiator (3) having a liquid inlet and a liquid outlet, the liquid inlet being arranged on the high-temperature side header (31), and the liquid outlet being arranged on the low-temperature side header (32); the circulation pipeline (4) comprising: A high-temperature oil pipeline (41) connecting the high-temperature oil outlet of the power module (2) and the liquid inlet of the radiator (3); A low-temperature oil pipeline (42) connects the low-temperature oil inlet of the power module (2) and the liquid outlet of the radiator (3); Wherein, the circulation pump (5) and the valve (7) are both arranged on the low-temperature oil pipeline (42).

3. The immersion liquid cooling charging system according to claim 2, characterized in that: The immersion liquid cooling charging system further includes: an expansion oil pot (6) disposed inside the cabinet (1) and connected to the low-temperature oil pipeline (42); the expansion oil pot (6) is located between the power module (2) and the top plate and is arranged in parallel with the radiator (3) in a horizontal direction; Wherein, on the low-temperature oil pipeline (42), the expansion oil pot (6) is located between the circulation pump (5) and the liquid outlet of the radiator (3).

4. The immersion liquid cooling charging system according to claim 3, characterized in that: The immersion liquid cooling charging system further includes: A plurality of liquid level sensors (61) are arranged at intervals on the inner side of the expansion oil pot (6) in the height direction of the cabinet (1).

5. The immersion liquid cooling charging system according to claim 3, characterized in that: The immersion liquid cooling charging system further includes: A filter is provided in the expansion oil pot (6) to filter the insulating oil entering the expansion oil pot (6).

6. The immersion liquid-cooled charging system according to claim 2, wherein: The immersion liquid cooling charging system further includes: A plurality of temperature and pressure sensors (11) are respectively arranged at at least one of three positions: in the power module (2), on the high-temperature oil pipeline (41), and on the low-temperature oil pipeline (42).

7. The immersion liquid-cooled charging system according to claim 1, wherein: The valve (7) and the circulation pump (5) form a power assembly, and there are two groups of power assemblies which are arranged in parallel on the circulation pipeline (4).

8. The immersion liquid-cooled charging system according to claim 2, wherein: The high-temperature side collecting pipe (31), the low-temperature side collecting pipe (32), and the plurality of heat dissipation pipes (33) form a heat dissipation module, the radiator (3) is composed of a heat dissipation component, and the heat dissipation component includes at least one heat dissipation module; Wherein, when the heat dissipation assembly includes a plurality of the heat dissipation modules, the plurality of heat dissipation modules in the same heat dissipation assembly are arranged in sequence in the axial direction of the high-temperature side header (31), the high-temperature side headers (31) in adjacent heat dissipation modules are interconnected, and the low-temperature side headers (32) in adjacent heat dissipation modules are interconnected.

9. The immersion liquid-cooled charging system according to claim 8, characterized in that: There are at least two groups of heat dissipation components, which are arranged in a horizontal direction perpendicular to the axial direction of the high-temperature side collecting pipe (31).

10. The immersion liquid-cooled charging system according to claim 9, characterized in that: There are two groups of heat dissipation components, and an angle is formed between the two groups of heat dissipation components.

11. The immersion liquid-cooled charging system according to claim 10, wherein: The radiator (3) and the power module (2) are both provided with connecting pipelines for connecting the high-temperature oil pipeline (41) and the low-temperature oil pipeline (42); Wherein, at the connecting pipeline at the radiator (3), the connection position of the high-temperature oil pipeline (41) and the connecting pipeline is the radiator front shunt pipe position interface, and the connection position of the low-temperature oil pipeline (42) and the connecting pipeline is the radiator rear shunt pipe position interface. When the insulating oil flows from the radiator front shunt pipe position interface in sequence through the connecting pipeline, each of the heat dissipation modules, the connecting pipeline, and reaches the radiator rear shunt pipe position interface, the insulating oil flows through different heat dissipation modules with the same length of distance. At the connecting pipeline at the power module (2), the connection position of the high-temperature oil pipeline (41) and the connecting pipeline is the module rear shunt pipe position interface, and the connection position of the low-temperature oil pipeline (42) and the connecting pipeline is the module front shunt pipe position interface. When the insulating oil flows from the module front shunt pipe position interface in sequence through the connecting pipeline, each of the power modules (2), the connecting pipeline, and reaches the module rear shunt pipe position interface, the insulating oil flowing through different power modules (2) has the same flow distance.

12. A control method for an immersion liquid-cooled charging system, characterized in that: The immersion liquid-cooled charging system according to any one of claims 1 to 11 comprises a controller, wherein the controller is electrically connected to a circulation pump (5) and a cooling fan (8), and the method comprises: Acquire key parameters and preset conditions in the immersion liquid-cooled charging system in real time, wherein the preset conditions include a first condition; Determining whether the key parameter meets the first condition; If the key parameter satisfies the first condition, a first control signal is output to the first mechanism and the second mechanism, wherein the first control signal is used to instruct the first mechanism and the second mechanism to shut down, the first mechanism is any one of the circulation pump (5) and the heat dissipation fan (8), and the second mechanism is the other of the circulation pump (5) and the heat dissipation fan (8), and the insulating oil in the circulation pipeline (4) flows at a first flow rate.

13. The control method of the immersion liquid cooling charging system according to claim 12, characterized in that: The preset condition further includes a second condition and a third condition, wherein the first condition to the third condition do not overlap with each other; after determining whether the key parameter satisfies the first condition, the method further includes: Determining whether the key parameter meets the second condition; Determining whether the key parameter meets the third condition; If the key parameter satisfies the second condition, outputting a second control signal to the first mechanism and the second mechanism, wherein the second control signal is used to instruct the first mechanism to operate in a low power state and to instruct the second mechanism to shut down; If the key parameter satisfies the third condition, a third control signal is output to the first mechanism and the second mechanism, where the third control signal is used to instruct the first mechanism and the second mechanism to operate in a low power state.

14. The control method of the immersion liquid cooling charging system according to claim 13, characterized in that: The preset conditions further include a fourth condition and a fifth condition, wherein the first condition to the fifth condition do not overlap with each other; after determining whether the key parameter satisfies the third condition, the method further includes: Determining whether the key parameter meets the fourth condition; Determining whether the key parameter satisfies the fifth condition; If the key parameter satisfies the fourth condition, outputting a fourth control signal to the first mechanism and the second mechanism, wherein the fourth control signal is used to instruct the first mechanism to operate in a high-power state and to instruct the second mechanism to operate in a low-power state; If the key parameter satisfies the fifth condition, a fifth control signal is output to the first mechanism and the second mechanism, where the fifth control signal is used to instruct the first mechanism and the second mechanism to operate in a high power state.

15. The control method of the immersion liquid cooling charging system according to claim 12, wherein: The key parameters are any one or more of the circulation pipeline temperature value, the radiator temperature value, the power module temperature value, the liquid flow rate value in the radiator, the charging system power value and the charging system current value.

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