A power converter and energy storage system with an air-liquid composite cooling unit

Abstract

The present application relates to the field of heat dissipation units, and in particular to a power converter and energy storage system with an air-liquid composite heat dissipation unit. The power converter includes a housing, a power converter and an air-liquid composite heat dissipation unit. Among them, the power conversion circuit includes a circuit board and a power tube, the circuit board and the upper cover plate of the housing are stacked and arranged, and there is a gap for air circulation between the top of the circuit board and the upper cover plate of the housing, and the power tube is located between the bottom of the circuit board and the lower cover plate of the housing. The air-liquid composite heat dissipation unit includes a fan and a cold plate, the cold plate is fitted with the side of the power tube, the fan is arranged between the bottom of the circuit board and the lower cover plate of the housing, and there is a gap for air circulation between the fan and the side plate of the housing. The power converter with an air-liquid composite heat dissipation unit disclosed in the present application dissipates heat for power tubes with high heat dissipation requirements through a cold plate, and dissipates heat for air in the equipment through a fan, which helps to improve heat dissipation efficiency and reduce heat dissipation costs.

Description

Technical Field

[0001] The present application relates to the field of heat dissipation units, and more specifically, to a power converter and an energy storage system with an air-liquid composite heat dissipation unit. Background Art

[0002] With the vigorous development of the new energy industry, the output power of power converters is gradually increasing. Therefore, higher requirements are also put forward for the heat dissipation capacity of power converters. The power converter usually includes a power conversion module and a heat dissipation unit. Among them, the devices included in the power conversion module mainly include: power tubes, inductors, relays, lightning arresters and Hall elements, etc. Power tubes, such as insulated gate bipolar transistors (IGBT), are composite fully controlled voltage-driven power semiconductor devices composed of bipolar triodes and insulated gate field effect transistors. They have the advantages of high input impedance and low conduction voltage drop. They are key components for energy conversion and transmission. Their heat consumption is usually large, and they are the heat dissipation bottleneck device of the power conversion module.

[0003] At present, the mainstream cooling units in the industry are mainly air-cooled units and liquid-cooled units. In the air-cooled unit, the power tube is close to the heat sink, and the heat dissipation requirements of the power tube are met by blowing the fan to the heat sink. However, when the output power of the power conversion module is high, the number of power tubes and the heat consumption increase accordingly, and the air-cooled unit is difficult to meet its high heat flux density heat dissipation requirements. In the liquid-cooled unit, the power tube is close to the cold plate, and coolant flows in the cold plate, and the heat dissipation requirements of the power tube are met through heat exchange. However, the liquid-cooled unit is expensive and cannot effectively reduce the temperature of the entire module, such as the inductor and relay in the module that are not in contact with the cold plate.

[0004] Therefore, there is an urgent need for a heat dissipation unit applied to a power converter that can meet the heat dissipation requirements of high-heat devices, improve heat dissipation efficiency, and reduce heat dissipation costs. Summary of the invention

[0005] The present application provides a power converter and energy storage system with an air-liquid composite heat dissipation unit. The air-liquid composite heat dissipation unit in the power converter dissipates heat for power tubes with high heat dissipation requirements through a cold plate, and dissipates heat for air in the equipment through a fan, which helps to improve heat dissipation efficiency and reduce heat dissipation costs.

[0006] In the first aspect, the present application provides a power converter with an air-liquid composite heat dissipation unit, the power converter includes a housing, a power conversion circuit and an air-liquid composite heat dissipation unit, the housing is used to accommodate the power conversion circuit and the air-liquid composite heat dissipation unit. The power conversion circuit includes a circuit board and at least one power tube, the circuit board and the upper cover plate of the housing are stacked, and there is a gap between the top of the circuit board and the upper cover plate of the housing, at least one power tube is arranged between the bottom of the circuit board and the lower cover plate of the housing, and at least one power tube is electrically connected to the circuit board. The air-liquid composite heat dissipation unit includes a fan and at least one cold plate, at least one cold plate is fitted with the side of at least one power tube, the fan is arranged between the bottom of the circuit board and the lower cover plate of the housing, the fan is electrically connected to the circuit board, and there is a gap between the fan and the side plate of the housing. The air-liquid composite heat dissipation unit in the power converter provided by the present application dissipates heat for the power tube with high heat dissipation requirements through the cold plate, and the air in the housing is circulated and dissipated along the gaps between the components by the fan, thereby improving the heat dissipation efficiency and reducing the heat dissipation cost.

[0007] In one embodiment, the air-liquid composite heat dissipation unit further includes a liquid collecting cavity, which is arranged on both sides of the cold plate and the power tube, and there is a gap between the liquid collecting cavity and the side plate of the shell. The liquid collecting cavity has a first liquid cooling interface group on the side close to the power tube, and the first liquid cooling interface group is used to connect at least one cold plate. In this way, the liquid collecting cavity provides cooling liquid for the cold plate, and there is a gap between the liquid collecting cavity and the power converter shell, which can allow the air in the shell to complete the circulation heat dissipation, simplify the structure of the air-liquid composite heat dissipation unit, and reduce the material cost.

[0008] In one embodiment, the liquid collecting cavity has a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are arranged opposite to the fan. In this arrangement, the cooling liquid enters and exits the liquid collecting cavity from the end away from the fan, which facilitates the maintenance of the air-liquid composite heat dissipation unit.

[0009] More specifically, the coolant inlet and the coolant outlet are located on different sides of the liquid collecting cavity. In this way, after the coolant enters the liquid collecting cavity, it flows to the cold plate and other heat dissipation components at the same time, such as the air-to-liquid heat exchanger described below, which can quickly reduce the temperature inside the housing of the power converter. Correspondingly, the coolant inlet and the coolant outlet are located on the same side of the liquid collecting cavity, and a partition is provided inside the liquid collecting cavity, which is used to separate the coolant inlet and the coolant outlet. In this way, after the coolant enters the liquid collecting cavity, it can first flow to the cold plate and then flow to the air-to-liquid heat exchanger, which can give priority to heat dissipation for power tubes with higher heat dissipation requirements.

[0010] In one embodiment, the air-liquid composite unit further includes an air-liquid heat exchanger, which is located below the cold plate, and there is a gap between the air-liquid heat exchanger and the side plate of the shell, and in the projection of a plane perpendicular to the height direction of the shell, the air-liquid heat exchanger and the cold plate are staggered. The liquid collecting cavity also has a second liquid cooling interface group on the side close to the power tube, and the second liquid cooling interface group is used to connect the air-liquid heat exchanger. In this setting, an operating space is left below the cold plate, which is convenient for the installation and maintenance of the power tube, and is conducive to the circulation and heat dissipation of the air in the shell.

[0011] In one embodiment, the side of the air-to-liquid heat exchanger away from the fan has a fin structure, and the fin structure is used for heat exchange between the coolant in the air-to-liquid heat exchanger and the air in the shell. In this arrangement, the air in the shell is blown by the fan and circulates along the gap between each component and the shell to the fin structure. The fin structure transfers the heat carried in the air to the coolant, thereby reducing the temperature in the power converter shell and ensuring the normal operation of each component.

[0012] In one embodiment, the power conversion circuit also includes an inductor, which is arranged between the bottom of the circuit board and the lower cover of the shell, and is electrically connected to the circuit board. The inductor is arranged between the fan and the shell. In the projection of the plane perpendicular to the height direction of the shell, the inductor is located on the side of the fan away from the cold plate. In this setting, the wind blown by the fan first passes through the inductor, and then circulates to the air-liquid heat exchanger through the gaps between the components and the shell, thereby completing the heat dissipation of the air in the shell, which can improve the heat dissipation efficiency.

[0013] In one embodiment, the power conversion circuit also includes a relay or a capacitor, and in the projection of a plane perpendicular to the height direction of the shell, the relay or capacitor is located on the side of the cold plate away from the fan. In this setting, components such as relays or capacitors are arranged on the side close to the cold plate but away from the fan, so that the wind blown by the fan passes through the inductor and then passes through the relay or capacitor in turn, thereby completing the heat dissipation of the air in the shell, which can improve the heat dissipation efficiency. In addition, by arranging the relay or capacitor on the side close to the cold plate but away from the fan, operating space can also be reserved, which is convenient for the assembly and maintenance of the device.

[0014] In one embodiment, the power converter may be a power conversion system (PCS), a direct current-direct current (DC-DC) conversion device, a frequency converter, a converter or a charging module.

[0015] In the second aspect, the present application also provides an energy storage system, which includes an energy storage cabinet, the energy storage cabinet is used to accommodate a battery pack and the power converter in the first aspect above, and the battery pack is located above or below the power converter along the height direction of the energy storage cabinet. The energy storage cabinet includes a cabinet body and a cabinet door, the cabinet door is used to close the cabinet body, and the cabinet body is used to fix the battery pack and the power converter. A mounting port is provided on the side of the cabinet door facing the power converter, and the mounting port is used to install a liquid cooling unit, and the liquid cooling unit is connected to the coolant inlet and the coolant outlet. In the projection of the plane perpendicular to the height direction of the cabinet body, the liquid cooling unit and the cabinet body partially overlap. In this energy storage system, the cold plate in the air-liquid composite heat dissipation unit is used to dissipate heat for the power tube with high heat dissipation requirements, and the air in the housing is circulated and dissipated along the gaps between the components by the fan, thereby improving the heat dissipation efficiency and reducing the heat dissipation cost. In addition, the air-liquid composite heat dissipation unit is connected to the Ye Keng unit fixed on the cabinet door through a liquid cooling pipe, which improves the convenience of installation, does not occupy or occupies less space in the cabinet connected to the cabinet door, and improves the space utilization rate of the cabinet.

[0016] In one embodiment, the energy storage system may be an energy storage cabinet or a charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an application scenario of this application.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of a power converter with an air-liquid composite heat dissipation unit provided in an embodiment of the present application.

[0019] Figure 3 It is a front view and a side view of an air-liquid composite heat dissipation unit provided in an embodiment of the present application.

[0020] Figure 4 It is a front view and a side view of another air-liquid composite heat dissipation unit provided in an embodiment of the present application.

[0021] Figure 5 The present application provides an example of a wind direction schematic diagram of a power converter with an air-liquid composite heat dissipation unit.

[0022] Figure 6 This is a wind direction schematic diagram of another example of a power converter with an air-liquid composite heat dissipation unit provided in an embodiment of the present application.

[0023] Figure 7 This is another wind direction schematic diagram of a power converter with an air-liquid composite heat dissipation unit provided in an embodiment of the present application.

[0024] Figure 8 It is a structural schematic diagram of an energy storage system provided in an embodiment of the present application.

[0025] Reference numerals:

[0026] Power converter-200; housing-210; circuit board-220; power conversion module-230; power tube-231; inductor-232; first liquid collecting cavity-2411; second liquid collecting cavity-2412; partition-2413; cold plate-242; fan-243; air-liquid heat exchanger-244; fin structure-2441; cooling liquid inlet-245; cooling liquid outlet-246; battery pack-300; energy storage system-800; energy storage cabinet-801; cabinet body-810; cabinet door-820; liquid cooling unit-830; liquid cooling terminal interface group-840; liquid cooling pipeline group-850. DETAILED DESCRIPTION

[0027] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0028] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to be used as limitations on the present application. As used in the specification and the appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one, two or more. The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0029] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0030] Figure 1 An example application scenario of the present application is shown. Figure 1As shown, scene 100 may be an energy storage cabinet 100, specifically including a battery compartment 110 and a power compartment 120, and the positions of the battery compartment 110 and the power compartment 120 may be interchangeable. Among them, the battery compartment 110 includes at least one battery pack 111. In one embodiment, in order to increase the capacity of the battery compartment 110, the battery compartment 110 may also include multiple battery packs, for example, including battery pack 111 and battery pack 112 at the same time. At least one device 121 is provided in the power compartment 120, and the device 121 includes a circuit board 1212 and a heat dissipation system 1211. Although Figure 1 Not shown, the circuit board 1212 is provided with a module capable of realizing a power conversion function, such as a power conversion circuit. In one embodiment, a plurality of devices, such as device 121 and device 122, may also be provided in the power compartment 120. Among them, devices 121 and 122 are power supply devices capable of realizing a power conversion function, such as: an inverter, a DC-DC conversion device or a power distribution module, etc. Taking the battery compartment 110 including a battery pack 111 as an example, the electric energy stored in the battery pack 111 can be directly provided to the outside after being processed by a DC-DC conversion device, for example, a power supply device for a vehicle-mounted battery. Or after being processed by a DC-DC conversion device and an inverter in sequence, AC power is output to the outside, for example, electricity for daily life and production. In the current technology, due to heat dissipation requirements and cost considerations, the heat dissipation system 1211 can be an air-cooled heat dissipation system or a liquid-cooled heat dissipation system. Among them, the air cooling system uses a fan to blow ambient air directly onto the internal circuit boards and devices to achieve the purpose of heat dissipation; in the liquid cooling system, the heat-generating devices on the circuit boards are cooled by attached cold plates, and the heat generated by the heat-generating devices is brought out by the coolant. The circuit boards can be isolated from the external environment, thereby achieving high protection and high reliability.

[0031] However, both air-cooling and liquid-cooling systems have their limitations. For air-cooling systems, when the output power of the heating device is large or the number of heating devices is large, the air-cooling system is difficult to meet its high heat flux density heat dissipation requirements. Even if the temperature equalization capacity can be improved by heat pipes and other methods to meet some heat dissipation requirements, the required heat dissipation area is large and the size of the module is difficult to reduce. In addition, in the air-cooling system, when the fan dissipates heat for the heating device, the protection level of the module is difficult to increase. The outside air is in direct contact with the circuit board for a long time. The corrosive substances, dust, water vapor, etc. in the air will cause the long-term working reliability of the module to decrease, the failure rate to increase, and the life of the device to shorten. In addition, when the heating device is fully loaded or overloaded, the fan runs at a high speed, the noise is large, and the impact on the surrounding environment is greater. For the liquid cooling system, although its heat dissipation capacity is stronger, the noise is lower, and the protection level is high, its system complexity is high and the cost is difficult to reduce.

[0032] As described in the background technology, different heat-generating devices have different heat flux densities for heat dissipation. For example, in the present application, the devices in the power conversion module can be roughly divided into high heat flux density devices, medium heat flux density devices and low heat flux density devices according to the heat flux density, wherein the high heat flux density devices may include power tubes or insulated gate bipolar transistor (IGBT) modules, etc., the medium heat flux density devices may include inductors, etc., and the low heat flux density devices may include capacitors, relays, lightning arresters and Hall elements, etc. In this way, different heat dissipation systems can be matched according to the heat dissipation requirements of different heat flux densities.

[0033] Based on the above reasons, the present application proposes a power converter and energy storage system with an air-liquid composite heat dissipation unit, which can meet the heat dissipation requirements of different devices, improve heat dissipation efficiency, and reduce heat dissipation costs.

[0034] Figure 2 A three-dimensional structural schematic diagram of a power converter with an air-liquid composite heat dissipation unit provided in an embodiment of the present application is shown. Figure 3 The front view and side view of an air-liquid composite heat dissipation unit provided in an embodiment of the present application are shown, wherein the front view is facing Figure 2 The side view is a view of the plane in which the length direction of the power converter 200 is located. Figure 2 The width direction of the power converter 200 shown in FIG. Figure 2 and Figure 3 The power converter 200 includes a housing 210, a power conversion circuit 230 and an air-liquid composite heat dissipation unit 240. The housing 210 is used to accommodate the power conversion circuit 230 and the air-liquid composite heat dissipation unit 240; the power conversion circuit 230 includes a circuit board 220 and at least one power tube 231, the circuit board 220 and the upper cover plate of the housing 210 are stacked, and there is a gap between the top of the circuit board 220 and the upper cover plate of the housing 210, at least one power tube 231 is arranged between the bottom of the circuit board 220 and the lower cover plate of the housing 210, and at least one power tube 231 is electrically connected to the circuit board 220. The air-liquid composite heat dissipation unit 240 includes a fan 243 and at least one cold plate 242, at least one cold plate 242 is attached to the side of at least one power tube 231, the fan 243 is arranged between the bottom of the circuit board 220 and the lower cover plate of the housing 210, the fan 243 is electrically connected to the circuit board 220, and there is a gap between the fan 243 and the side plate of the housing 210. In this way, the air-liquid composite heat dissipation unit 240 in the power converter 200 dissipates heat for the power tube 231 with high heat dissipation requirements through the cold plate 242, and circulates the air in the shell 210 along the gaps between the components through the fan 243 to dissipate heat, thereby improving the heat dissipation efficiency and reducing the heat dissipation cost.

[0035] In the embodiment of the present application, the flow channel inside the cold plate 242 can be a porous structure processed by an extrusion process. When the coolant flows in the porous structure, the contact area with the cold plate 242 increases, thereby increasing the heat dissipation capacity of the cold plate 242 and improving the heat dissipation efficiency of the heat dissipation system. In one embodiment, the cold plate 242 can be processed or designed as a sandwich structure by profiles, aluminum extrusion and other process methods according to different heat dissipation requirements, and dissipate heat for high heat flux density devices such as power tubes 231 (or IGBT modules). The power tube 231 can be attached to the cold plate 242 by silicone grease, ceramic sheets and silicone grease for heat dissipation, and the IGBT module is attached to the cold plate 242 for heat dissipation by silicone grease. In one embodiment, a heat dissipation tooth structure (not shown in the figure) is provided in the flow channel of the cold plate 242. The heat dissipation tooth structure is used to increase the turbulence of the coolant in the flow channel of the cold plate 242 and the contact area between the coolant and the cold plate 242, further increase the heat dissipation capacity of the cold plate 242, and improve the heat dissipation efficiency of the heat dissipation system.

[0036] It is worth mentioning that when the cold plate 242 and the power tube 231 are installed, one cold plate 242 can dissipate heat for two power tubes 231 at the same time. In actual installation, the correspondence between the cold plate 242 and the power tube 231 can be flexibly configured according to the number of power tubes 231 and the actual needs of the power tubes 231. For example, when the number of power tubes 231 is large, in order to save the installation area, the correspondence between the cold plate 242 and the power tube 231 can be set to one-to-many, that is, one cold plate 242 dissipates heat for multiple power tubes 231 at the same time. For another example, when the power tube 231 has a high demand for heat dissipation, the correspondence between the cold plate 241 and the power tube 231 can be set to many-to-one, that is, multiple cold plates 242 dissipate heat for one power tube 231 at the same time. For another example, the correspondence between the cold plate 242 and the power tube 231 can also be one-to-one, which is not limited in this application.

[0037] Continue to refer to Figure 2 and Figure 3The air-liquid composite heat dissipation unit also includes a liquid collecting cavity 2411 and a liquid collecting cavity 2412, which are arranged on both sides of the cold plate 242 and the power tube 231, and there is a gap between the liquid collecting cavity 2411 and the liquid collecting cavity 2412 and the side plate of the shell 210. The liquid collecting cavity 2411 and the liquid collecting cavity 2412 have a first liquid cooling interface group (not shown in the figure) on the side close to the power tube 231, and the first liquid cooling interface group is used to connect at least one cold plate 242. In this way, the liquid collecting cavity 2411 and the liquid collecting cavity 2412 provide cooling liquid for the cold plate 242, and there is a gap between the liquid collecting cavity 2411 and the liquid collecting cavity 2412 and the shell 210 of the power converter, which can allow the air in the shell 210 to complete the circulation heat dissipation, simplify the structure of the air-liquid composite heat dissipation unit 240, and reduce the material cost.

[0038] Figure 4 The front view and side view of another air-liquid composite heat dissipation unit provided in the embodiment of the present application are shown, wherein the front view is facing Figure 2 The side view is a view of the plane in which the length direction of the power converter 200 is located. Figure 2 FIG. 2 is a view of a plane in which the width direction of the power converter 200 is located. Figure 3 and Figure 4 The liquid collecting cavity has a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are arranged opposite to the fan. In this arrangement, the cooling liquid enters and exits the liquid collecting cavity 2411 and the liquid collecting cavity 2412 from the end away from the fan 243, which is convenient for the maintenance of the air-liquid composite heat dissipation unit 240.

[0039] Reference Figure 3 In one embodiment, the cooling liquid inlet 245 and the cooling liquid outlet 246 are arranged on the same side of the liquid collecting cavity 2411 and the liquid collecting cavity 2412, for example, they are arranged on the liquid collecting cavity 2411, and the liquid collecting cavity 2411 also has a partition 2413 inside, and the partition 2413 is used to separate the cooling liquid inlet 245 and the cooling liquid outlet 246. The cooling liquid inlet 245 is located below the cooling liquid outlet 246. In this way, after the cooling liquid enters the liquid collecting cavity 2411, it first flows to the air-liquid heat exchanger 244, then flows to the liquid collecting cavity 2412, and then flows to the cold plate 242, which can preferentially reduce the temperature of the air in the shell 210. Although not shown in the figure, in another embodiment, when the coolant inlet 245 and the coolant outlet 246 are simultaneously arranged on the liquid collecting cavity 2411 and separated by the partition 2413, the coolant inlet 245 can also be located above the coolant outlet. In this way, after the coolant enters the liquid collecting cavity 2411, it first flows to the cold plate 242, then flows to the liquid collecting cavity 2412, and subsequently flows to the air-liquid heat exchanger 244, which can give priority to heat dissipation for the power tube 231 with higher heat dissipation requirements.

[0040] Refer to Figure 4 In one embodiment, the coolant inlet 245 and the coolant outlet 246 are arranged on different sides of the liquid collecting cavity. For example, the coolant inlet 245 is arranged on the side of the liquid collecting cavity 2411, and the coolant outlet 246 is arranged on the side of the liquid collecting cavity 2413. In this way, after the coolant enters the flow channel of the liquid collecting cavity 2411 from the coolant inlet, it flows to the flow channel of the air-to-liquid heat exchanger 244 and the flow channel of the cold plate 242 at the same time, that is, the flow channel of the air-to-liquid heat exchanger and the flow channel of the cold plate are in parallel. In this way, after the coolant flows into the liquid collecting cavity 2411, most of it can flow to the flow channel in the cold plate 242 to dissipate heat for the power tube 231, and a small part enters the air-to-liquid heat exchanger 244 to dissipate heat for the air in the shell 210.

[0041] Continue to refer to Figure 2 , Figure 3 and Figure 4 In one embodiment, the air-liquid combined unit 240 further includes an air-liquid heat exchanger 244, which is located below the cold plate 242, and there is a gap between the air-liquid heat exchanger 244 and the side plate of the shell 210, and in the projection perpendicular to the plane in the height direction of the shell 210, the air-liquid heat exchanger 244 and the cold plate 242 are staggered. The liquid collecting cavity 2411 and the side of the liquid collecting cavity 2412 close to the power tube 231 also have a second liquid cooling interface group (not shown in the figure), and the second liquid cooling interface group is used to connect the air-liquid heat exchanger 244. In this arrangement, an operating space is left below the cold plate 242, which is convenient for the installation and maintenance of the power tube 231, and is conducive to the circulation and heat dissipation of the air in the shell 210. The air-liquid heat exchanger 244 has a fin structure 2441 on the side away from the fan 243, and the fin structure 2441 is used for heat exchange between the coolant in the air-liquid heat exchanger 244 and the air in the shell 210. In this arrangement, the air in the housing 210 is blown by the fan 243 and circulates along the gaps between the components and the housing 210 to the fin structure 2441, thereby reducing the temperature in the power converter housing 210 and ensuring the normal operation of the components.

[0042] Continue to refer to Figure 2In one embodiment, the power conversion circuit 230 also includes an inductor 232, which is arranged between the bottom of the circuit board 220 and the lower cover plate of the shell 210, and the inductor 232 is electrically connected to the circuit board 220, and there is a gap between the inductor 232 and the side plate of the shell 210. The inductor 232 is arranged between the fan 243 and the shell 210. In the projection of the plane perpendicular to the height direction of the shell 210, the inductor 232 is located on the side of the fan 243 away from the cold plate 242. In this setting, the wind blown by the fan 243 first passes through the inductor 232, and then circulates to the air-liquid heat exchanger 244 through the gaps between the components and the shell 210, thereby completing the heat dissipation of the air in the shell 210, which can improve the heat dissipation efficiency.

[0043] In one embodiment, the power conversion circuit 230 also includes a relay or a capacitor. Although not shown in the figure, in the projection perpendicular to the plane in the height direction of the housing 210, the relay or capacitor is located on the side of the cold plate 242 away from the fan 243. In this arrangement, components such as relays or capacitors are arranged on a side close to the cold plate 242 but away from the fan 243, so that the wind blown out by the fan 243 passes through the inductor 232 and then passes through the relay or capacitor in turn, thereby completing the heat dissipation of the air in the housing 210, which can improve the heat dissipation efficiency. In addition, by arranging the relay or capacitor on a side close to the cold plate 242 but away from the fan 243, it is also possible to reserve operating space, which is convenient for the assembly and maintenance of the device.

[0044] Figure 5 A wind direction schematic diagram of a power converter with an air-liquid composite heat dissipation unit provided in an embodiment of the present application is shown. Figure 5 for Figure 2 An example side view of the power converter 200 shown in FIG. Figure 2 FIG. 2 is a view of a plane in which the width direction of the power converter 200 is located. Figure 5 There is a gap between the inductor 232 and the side wall of the housing 210, there is a gap between the circuit board 220 and the upper cover of the housing 210, and there is a gap between the air-liquid heat exchanger 244 and the side wall of the housing 210. In this way, the wind blown by the fan 243 can be blown along Figure 5 In the direction shown by the middle dotted line, the air first passes through the inductor 232, returns from the top of the circuit board 220, and then passes through possible capacitors, relays, Hall elements, lightning arresters, auxiliary sources and other devices in turn, and finally enters the air-to-liquid heat exchanger 244 for cooling, completing the circulation heat dissipation and reducing the volume of the power converter 200.

[0045] Figure 6 A wind direction schematic diagram of another power converter with an air-liquid composite heat dissipation unit provided in an embodiment of the present application is shown. Figure 7 A wind direction schematic diagram of another example of a power converter with an air-liquid composite heat dissipation unit provided in an embodiment of the present application is shown. Figure 6 and Figure 7 Both Figure 2 The side view of the power converter 200 shown in FIG. Figure 2 A view of a plane in which the height direction of the power converter 200 is located as shown in FIG. Figure 6 There is a gap between the inductor 232 and the front side wall of the housing 210, there is a gap between the circuit board 220 and the right side wall of the housing 210, and there is a gap between the air-liquid heat exchanger 244 and the rear side wall of the housing 210. In this way, the wind blown by the fan 243 can be blown along Figure 6 In the direction indicated by the dotted line, the air first passes through the inductor 232, returns from the right side of the circuit board 220, and then passes through the capacitor, relay, Hall element, lightning arrester, auxiliary source and other devices that may exist, and finally enters the air-to-liquid heat exchanger 244 for cooling, completing the circulation heat dissipation. Figure 7 There is a gap between the inductor 232 and the front side wall of the housing 210, there is a gap between the circuit board 220 and the left side wall and the right side wall of the housing 210, and there is a gap between the air-liquid heat exchanger 244 and the rear side wall of the housing 210. In this way, the wind blown by the fan 243 can be blown along Figure 7 In the direction shown by the middle dotted line, the air first passes through the inductor 232, returns from the left and right sides of the circuit board 220, and then passes through the possible capacitors, relays, Hall elements, lightning arresters, auxiliary sources and other devices in turn, and finally enters the air-to-liquid heat exchanger 244 for cooling, completing the circulation heat dissipation.

[0046] It is worth mentioning that, in one embodiment, the power converter 200 can simultaneously use Figure 5 The top side return air as shown and Figure 6 In another embodiment, the power converter 200 can simultaneously adopt the single-side return air combination design scheme shown in Figure 5 The top side return air as shown and Figure 7 The combined design of double-side return air shown in the figure increases the volume of the power converter 200 to a certain extent, but compared with the top-side return air and single-side return air designs, the air circulation speed is faster and the heat dissipation efficiency is better.

[0047] Figure 8 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application is shown. Figure 8The energy storage system 800 includes an energy storage cabinet 801, which is used to accommodate a battery pack 300 and a power converter 200. Along the height direction of the energy storage cabinet 801, the battery pack 300 is located above the power converter 200. The energy storage cabinet 801 includes a cabinet body 810 and a cabinet door 820, the cabinet door 820 is used to close the cabinet body 810, and the cabinet body 810 is used to fix the battery pack 300 and the power converter 200. The cabinet door 820 is provided with an installation opening (not shown in the figure) on the side facing the power converter 200, and the installation opening is used to install a liquid cooling unit 830, and the liquid cooling unit 830 is connected to the cooling liquid inlet 245 and the cooling liquid outlet 246. In the projection perpendicular to the plane in the height direction of the cabinet body 810, the liquid cooling unit 830 partially overlaps with the cabinet body 810. In this energy storage system, the cold plate 242 in the air-liquid composite heat dissipation unit 240 is used to dissipate heat for the power tube 231 with high heat dissipation requirements, and the air in the housing 210 is circulated along the gaps between the components by the fan 243 to dissipate heat, thereby improving the heat dissipation efficiency and reducing the heat dissipation cost. In addition, the air-liquid composite heat dissipation unit 240 is connected to the liquid cooling unit 830 fixed on the cabinet door 820 through the liquid cooling pipeline group 850, which improves the convenience of installation, does not occupy or occupies less space in the cabinet 810 connected to the cabinet door 820, and improves the space utilization rate of the cabinet 810.

[0048] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power converter with an air-liquid composite heat dissipation unit, characterized in that: The power converter comprises a housing, a power conversion circuit and the air-liquid composite heat dissipation unit, wherein the housing is used to accommodate the power conversion circuit and the air-liquid composite heat dissipation unit. The power conversion circuit includes a circuit board and a plurality of power tubes, the circuit board and the upper cover plate of the housing are stacked, and there is a gap between the top of the circuit board and the upper cover plate of the housing, each of the power tubes is arranged between the bottom of the circuit board and the lower cover plate of the housing, and each of the power tubes is electrically connected to the circuit board; The air-liquid composite heat dissipation unit comprises a fan and a plurality of cold plates, the arrangement direction of the plurality of cold plates is parallel to the arrangement direction of the fan and the side plates of the housing, both sides of each cold plate along the arrangement direction of the plurality of cold plates are respectively fitted with at least one of the power tubes, the fan is arranged between the bottom of the circuit board and the lower cover plate of the housing, and there is a gap between the fan and the side plates of the housing; The air-liquid composite heat dissipation unit also includes two liquid collecting cavities, which are arranged on both sides of the multiple cold plates and the multiple power tubes. The two liquid collecting cavities are respectively used to connect each of the cold plates, and the arrangement direction of the two liquid collecting cavities, the arrangement direction of the multiple cold plates, and the arrangement direction of the upper cover plate of the shell and the lower cover plate of the shell intersect each other.

2. The power converter according to claim 1, characterized in that: A first liquid cooling interface group is provided on a side of the liquid collecting cavity close to the power tube, and the first liquid cooling interface group is used to connect to the cold plate.

3. The power converter according to claim 1, characterized in that: The liquid collecting cavity is provided with a cooling liquid inlet and a cooling liquid outlet, and the cooling liquid inlet and the cooling liquid outlet are arranged opposite to the fan.

4. The power converter according to claim 3, characterized in that: The cooling liquid inlet and the cooling liquid outlet are located on the same side of the liquid collecting cavity. A partition is provided inside the liquid collecting cavity, and the partition is used to separate the cooling liquid inlet and the cooling liquid outlet.

5. The power converter according to claim 1, characterized in that: The air-liquid composite heat dissipation unit also includes an air-liquid heat exchanger, which is located below the cold plate. There is a gap between the air-liquid heat exchanger and the side plate of the shell, and in the projection perpendicular to the plane in the height direction of the shell, the air-liquid heat exchanger and the cold plate are staggered.

6. The power converter according to claim 5, characterized in that: The liquid collecting cavity also has a second liquid cooling interface group on one side close to the power tube, and the second liquid cooling interface group is used to connect to the air-liquid heat exchanger.

7. The power converter according to claim 5, characterized in that: The side of the air-to-liquid heat exchanger away from the fan has a fin structure, and the fin structure is used for heat exchange between the coolant in the air-to-liquid heat exchanger and the air in the shell.

8. The power converter according to claim 1, characterized in that: The power conversion circuit also includes an inductor, which is arranged between the bottom of the circuit board and the lower cover plate of the shell, the inductor is electrically connected to the circuit board, and there is a gap between the inductor and the side plate of the shell.

9. The power converter according to claim 8, characterized in that: In a projection perpendicular to a plane in a height direction of the housing, the inductor is arranged between the fan and the housing.

10. The power converter according to any one of claims 1 to 9, characterized in that: The power conversion circuit further includes a relay or a capacitor. In a projection perpendicular to a plane in the height direction of the housing, the relay or the capacitor is located on a side of the cold plate away from the fan.

11. An energy storage system, characterized in that: The energy storage system includes an energy storage cabinet and at least one power converter described in any one of 1 to 10, wherein the energy storage cabinet includes a cabinet body and a cabinet door, wherein the cabinet door is used to close the cabinet body, and the cabinet body is used to fix the power converter.

12. The energy storage system according to claim 11, characterized in that: The energy storage system includes a battery pack, and along the height direction of the energy storage cabinet, the battery pack is located above or below the power converter.

13. The energy storage system according to claim 12, characterized in that: A mounting opening is arranged on a side of the cabinet door facing the power converter, and the mounting opening is used for mounting a liquid cooling unit, and the liquid cooling unit is connected with a cooling liquid inlet and a cooling liquid outlet of the liquid collecting cavity.

14. The energy storage system according to claim 13, characterized in that: When the cabinet door closes the cabinet, in the projection of a plane perpendicular to the height direction of the cabinet, the liquid cooling unit partially overlaps with the cabinet.

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