Liquid cooling unit for dissipating heat from battery, and energy storage box

Abstract

Disclosed in the embodiments of the present application are a liquid cooling unit for dissipating heat from a battery, and an energy storage box. A controller, a driver and a spoiler fan are sealed in an electric control box, and the controller and the spoiler fan are arranged in a staggered manner in a height direction in the electric control box, such that air circulation flow is formed in the electric control box, and the temperature in the electric control box is kept uniform, thereby avoiding over-temperature operation of the controller. In addition, an air duct and a second heat sink arranged in the air duct are arranged outside the electric control box, and in cooperation with the air extraction effect of a heat dissipation fan located at the top and the heat dissipation effect of a first heat sink, most of heat can be taken away, thereby ensuring the heat dissipation of power systems.

Description

Liquid cooling unit and energy storage box for heat dissipation of battery

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202422306229.X, filed on September 20, 2024, and entitled "Liquid cooling unit and energy storage box for heat dissipation of battery", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of new energy technology, in particular to a liquid cooling unit and energy storage box for heat dissipation of battery. BACKGROUND

[0004] In order to load larger battery capacity, the energy storage box requires a high-density design of the liquid cooling unit. The liquid cooling unit, as the core thermal control component of the energy storage device, requires high compactness. Moreover, the electrical control devices such as the controller, the driver and the reactor of the liquid cooling unit generate a large amount of heat during operation. In order to meet the outdoor reliable application of the energy storage device, the controller, the driver and the reactor need to be installed in a sealed cavity that meets the protection level, therefore, it is difficult to remove the heat. How to solve the heat dissipation of the driver and the controller and maintain the uniform temperature in the compact and closed space by using a simple heat dissipation structure is a technical problem to be solved in the field. SUMMARY

[0005] The present application provides a liquid cooling unit and energy storage box for heat dissipation of battery, to achieve efficient heat dissipation of the electrical control structure of the liquid cooling unit.

[0006] In a first aspect, the embodiments of the present application provide a liquid cooling unit for heat dissipation of a battery, which comprises a frame, an electric control box, an air duct, a first heat sink and a heat dissipation fan. In the height direction of the frame, the heat dissipation fan is fixed to the top of the frame, the electric control box is fixed to the bottom of the frame, and the first heat sink is located between the heat dissipation fan and the electric control box. The first heat sink is used for heat exchange with the cooling liquid of the battery to dissipate heat of the battery, and the heat dissipation fan is used to drive the airflow to flow and carry away the heat of the first heat sink. The electric control box is provided with devices for controlling and driving components of the liquid cooling unit. Specifically, the inside of the electric control box is provided with a controller, a driver and a turbulence fan, the controller is used to control the driver to work and control the turbulence fan to rotate, and the driver is used to drive components of the liquid cooling unit, such as driving the compressor of the first heat sink to work, driving the water pump of the liquid cooling unit to work, etc. The turbulence fan and the controller are respectively arranged at different levels, that is, the distance between the bottom of the turbulence fan and the bottom of the electric control box is different from the distance between the bottom of the controller and the bottom of the electric control box, so that the turbulence fan and the controller are arranged in staggered arrangement in the height direction. The outside of the electric control box is provided with an air duct, which extends along the width direction of the energy storage box. In the height direction of the frame, the air duct can take in air at the bottom and discharge air at the top, so that the airflow can circulate in the air duct to carry away heat. The second heat sink is arranged in the air duct and can be directly fixed to the outside of the electric control box. The second heat sink is used for heat dissipation of the driver inside the electric control box, and the airflow flowing in the air duct can carry away the heat dissipated by the second heat sink.

[0007] In the present application, the electric control module such as the controller and the driver is integrated and designed in a closed metal shell to form an electric control box, which can meet the protection level requirements of outdoor application. The turbulence fan is added in the electric control box, and the layout of the devices in the electric control box is optimized, that is, the turbulence fan and the controller are arranged at different levels and staggered in the height direction, the position relationship between the controller and the turbulence fan is utilized to realize the circulation of the airflow in the electric control box, avoid the airflow flow dead angle, ensure the uniform distribution of the temperature in the electric control box, avoid the over-temperature of the controller, and accelerate the dissipation of the heat in the electric control box through the metal shell of the electric control box to improve the heat dissipation. The second heat sink arranged outside the electric control box accelerates the conduction of the heat of the driver to the outside of the electric control box, and the airflow flowing in the air duct carries away the heat. The heat dissipation fan arranged at the top of the frame can be one or more, and the suction effect of the heat dissipation fan can accelerate the flow speed of the airflow in the first heat sink and the air duct below, ensure that most of the heat dissipated by the second heat sink in the air duct can be carried away by the airflow, and ensure the heat dissipation of the power system.

[0008] In some embodiments of the present application, inside the electric control box, the turbulence fan and the driver can be arranged side by side in the horizontal direction, so that the turbulence fan can directly circulate air flow to the driver to cool the driver. The turbulence fan is arranged above the controller, and the air flow can be circulated to the controller below after passing through the driver. The circulation of the air flow in the electric control box is achieved, avoiding the occurrence of air flow dead angle, ensuring the uniform distribution of the internal temperature of the electric control box, and avoiding over-temperature of the controller.

[0009] In some embodiments of the present application, the driver includes a first driver and a second driver. The first driver is used to drive the compressor of the first radiator, and the second driver is used to drive the water pump of the liquid cooling unit. The turbulence fan is located between the first driver and the second driver, and faces the first driver. The circulation direction of the air flow in the electric control box is that the air flow is circulated to the first driver through the turbulence fan, and is turned to the second driver through the controller below. The circulation of the air flow in the electric control box is achieved by using the air extraction function of the turbulence fan, avoiding the occurrence of air flow dead angle, ensuring the uniform distribution of the internal temperature of the electric control box, and avoiding over-temperature of the controller.

[0010] In some embodiments of the present application, a second radiator can be attached to the position opposite to the driver outside the electric control box by using heat-conducting glue for heat dissipation. It can be considered that the second radiator is fixed to the outer side of the electric control box, and in the height direction of the frame, the second radiator is located in the same horizontal plane as the driver.

[0011] In some embodiments of the present application, a frame body can be arranged on the side of the electric control box close to the frame, and an air duct can be arranged on the side of the electric control box away from the frame. The air duct can be composed of a first side wall, a second side wall and a third side wall which are connected in sequence and surround the periphery of the second radiator. The first side wall and the third side wall are fixed to the outer side of the electric control box, and the second side wall is connected to the first side wall and the third side wall and is parallel to the outer side of the electric control box. The air duct can be fixed to the outer side of the electric control box by bolts, which is convenient for disassembly, so as to regularly clean and maintain the dust of the second radiator.

[0012] In some embodiments of the present application, in order to accelerate the flow speed of the air flow inside the air duct, at least one driving fan can be arranged at the bottom of the air duct. The driving fan blows air towards the inside of the air duct, accelerates the flow speed of the air flow in the air duct, and cooperates with the air extraction function of the heat dissipation fan at the top of the frame to make the air flow out of the air outlet at the top of the frame. The speed of the air flow flowing into the air duct can be improved, and the air flow circulation inside the air duct can be accelerated, so as to take away more heat in the electric control box conducted by the second radiator.

[0013] In some other embodiments of the present application, the driving fan can be arranged obliquely at the bottom of the air duct, for example, the driving fan can be inclined by 45 degrees with respect to the horizontal plane, so as to reduce the space occupied by the driving fan.

[0014] In the present application, the number of driving fans can be set as required, for example, two driving fans can be provided, each corresponding to the position of the gap between the two adjacent second radiators, so that the driving fan blows air to the two adjacent second radiators.

[0015] In some embodiments of the present application, in application scenarios where the environmental temperature requirement is not high, for example, the environmental temperature is lower than 50℃, or the driving heat generation is small, the number of driving fans can be reduced, or the driving fans can be directly omitted, to reduce the cost of heat dissipation. The air flow is directly driven by the air volume of the heat dissipation fan arranged at the top of the frame, a heat dissipation air duct is formed at the first radiator and the second radiator, and the purpose of taking away the heat of the main heat generating elements is achieved.

[0016] In some embodiments of the present application, in order to facilitate heat dissipation and air flow circulation, a plurality of first radiators can be provided, for example, two first radiators, and the bottom ends of the two first radiators form an acute angle, and the two first radiators can be fixed at the bottom ends by a connecting piece. The heat dissipation fan located at the top of the frame can drive the air flow to take away the heat dissipated by the first radiator.

[0017] In embodiments of the present application, the specific layout mode of the first radiator can be adjusted according to the specific application environment, for example, when air can enter from opposite sides of the frame, the two first radiators can be symmetrically arranged.

[0018] In some embodiments of the present application, when air can enter from only one side of the frame, for example, air cannot enter from the right side, in order to ensure the heat dissipation effect of the first radiator on the right side, the first radiator on the left side can be placed vertically, so as to increase the area and air intake of the first radiator on the right side, and improve the heat dissipation effect of the first radiator on the right side. As a whole, the bottom of the two first radiators can be considered to be arranged close to the side where air can enter.

[0019] In some embodiments of the present application, a pure inductance scheme can be used in the electrically controlled heat dissipation structure to achieve harmonic processing. Specifically, the electric reactor is fixed at the bottom of the frame, and the electric reactor is arranged side by side with the electric control box. In order to meet the protection level requirement of the outdoor application of the electric reactor, the electric reactor can be filled with glue for encapsulation to form a heat-conducting glue outside the electric reactor. The heat conductivity coefficient of the heat-conducting glue can be 0.7W / mK or 1.5W / mK. After the heat is transmitted to the shell through the heat-conducting glue, the heat dissipation fins extending in the horizontal direction are arranged outside the heat-conducting glue, that is, the heat dissipation fins are arranged horizontally. The heat dissipation air duct formed by the heat dissipation fan at the top of the frame and the first radiator can take away the heat of the electric reactor. A perforated mesh cover can also be used outside the heat dissipation fins for protection. The mesh cover can prevent burns and avoid direct contact between the maintenance personnel and the shell of the electric reactor.

[0020] In some embodiments of the present application, the second heat sink can specifically adopt a fin heat sink, and the fin direction of the fin heat sink can be in a vertical direction, i.e., the fins extend along the vertical direction, which is beneficial to reducing the resistance of the airflow in the air duct during the process of flowing from below to above, so as to take away the heat dissipated by the fins during the airflow flowing process. The number of the second heat sink can be set to be consistent with the number of the driver.

[0021] In a second aspect, the embodiments of the present application provide an energy storage box, comprising: a battery pack and the liquid cooling unit provided in the first aspect.

[0022] The technical effects that any possible design in the second aspect can achieve can refer to the technical effects that any possible design in the first aspect can achieve, which will not be repeated here. These aspects or other aspects of the present application will be more clear and understandable in the description of the following embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background art, the following will illustrate the drawings needed to be used in the embodiments of the present application or the background art.

[0024] Fig. 1 is a structural schematic diagram of an energy storage box;

[0025] Fig. 2 is a front view structural schematic diagram of an electric control heat dissipation structure of a liquid cooling unit provided by the embodiments of the present application;

[0026] Fig. 3a is a front view structural schematic diagram of the inside of an electric control box in the electric control heat dissipation structure of the liquid cooling unit provided by the embodiments of the present application;

[0027] Fig. 3b is a front view structural schematic diagram of the outside of the electric control box in the electric control heat dissipation structure of the liquid cooling unit provided by the embodiments of the present application;

[0028] Fig. 4 is a side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided by the embodiments of the present application;

[0029] Fig. 5 is another side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided by the embodiments of the present application;

[0030] Fig. 6 is another side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided by the embodiments of the present application;

[0031] Fig. 7 is another side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided by the embodiments of the present application.

[0032] Reference signs: 20 - energy storage container; 21 - box; 211 - first compartment; 212 - second compartment; 2121 - temperature control compartment; 2122 - power distribution compartment; 100 - frame; 200 - electric control box; 210 - controller; 220 - driver; 221a, 221b - first driver; 222 - second driver; 230 - spoiler fan; 240 - second radiator; 250 - driving fan; 300 - air duct; 400, 410, 420 - first radiator; 430 - connecting piece; 500 - radiating fan; 600 - electric reactor; 610 - radiating fin; 620 - open mesh cover. DETAILED DESCRIPTION

[0033] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0034] The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this specification and the appended claims, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise.

[0035] Reference herein to "one embodiment" or "an embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment" or "in some embodiments" or "in other embodiments" or "in still other embodiments" in various places in the specification are not necessarily all referring to the same embodiment, however, but are intended to convey a particular feature, structure, or characteristic described in connection with the embodiment that the phrase is used in, including alternative embodiments.

[0036] In addition, the same reference numerals are used in different drawings to represent the same or similar structures so that repeated description thereof will be omitted. The expressions of position and direction described in the present application are described with reference to the drawings, but can be changed as needed, and the changes are included in the scope of protection of the present application. The drawings of the present application are only used to show the relative positional relationship and do not represent the actual proportions.

[0037] The liquid cooling unit of the power station energy storage is a core thermal control component of the energy storage battery, and has high compactness requirement. The electric control devices such as the controller, the driver and the electric reactor generate a large amount of heat in the working process. In order to meet the reliable application in the outdoor, avoid the over-temperature work of the devices, and reduce the maintenance difficulty of the unit, the heat dissipation scheme with low noise, low energy consumption and low failure rate is needed to take away the heat in time.

[0038] Based on this, the application provides a liquid cooling unit and energy storage box for heat dissipation of a battery. The controller, the driver and the turbulence fan are sealed in the electric control box. The controller and the turbulence fan are arranged in a staggered manner in the height direction in the electric control box. The air circulation flow is formed in the electric control box to keep the temperature uniform in the electric control box and avoid over-temperature work of the controller. The air duct is arranged outside the electric control box, and the second radiator is arranged in the air duct. The air exhaust function of the cooling fan at the top and the heat dissipation function of the first radiator can take away most of the heat to ensure the heat dissipation of the power system.

[0039] The liquid cooling unit and energy storage box for heat dissipation of a battery provided by the application will be described in detail below with reference to the accompanying drawings.

[0040] In the micro-grid system, new energy power generation devices such as photovoltaic panels, photovoltaic inverters, power conversion systems (PCS) and energy storage boxes are usually configured. The photovoltaic inverter is used to convert the electric energy of the photovoltaic panel into alternating current and output to the power grid. The PCS is used to convert the electric energy stored in the energy storage box into alternating current and output to the power grid. The PCS can also be integrated in the energy storage box. In the power station scenario, the energy storage box is also called an energy storage container. Referring to FIG. 1, the energy storage container 20 is provided with a battery compartment, a temperature control compartment and a power distribution compartment. The liquid cooling unit is arranged in the temperature control compartment to dissipate heat for the energy storage container and prevent thermal runaway of the energy storage container.

[0041] In the energy storage container 20 of the application, the second compartment 212 is arranged on one side of the first compartment 211 in the length direction L of the box body 21. The first compartment 211 can form a battery compartment with continuous space, so that the battery packs can be continuously and reasonably distributed in the first compartment 211, thereby fully utilizing the internal space of the first compartment 211, improving the number of battery packs contained in the first compartment 211, and further improving the energy storage density of the first compartment 211, which is beneficial to improve the energy storage effect and integration of the energy storage container 20. Specifically, a plurality of battery packs are contained in the box body 21, and the plurality of battery packs are arranged in sequence along the length direction L of the box body 21.

[0042] The temperature control compartment 2121 is used to accommodate a liquid cooling unit, and the power distribution compartment 2122 is used to accommodate power distribution devices and control devices.

[0043] The power distribution compartment 2122 of the energy storage container 20 is provided with the electric control heat dissipation structure of the liquid cooling unit provided in the present application. The controller, the driver and the spoiler fan are sealed in the electric control box. The controller and the spoiler fan are arranged in a staggered manner in the height direction in the electric control box, so that air circulation is formed in the electric control box, the temperature in the electric control box is uniform, and the controller is prevented from working at a high temperature. In addition, the air duct is arranged outside the electric control box, and the second heat sink is arranged in the air duct. The air exhaust function of the heat dissipation fan located at the top and the heat dissipation function of the first heat sink can carry away most of the heat, so as to ensure the heat dissipation of the power system.

[0044] The electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application can be applied not only to the energy storage tank but also to the cooling liquid distribution unit (CDU) heat dissipation of the data center.

[0045] FIG. 2 exemplarily shows a front view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application; FIG. 3a exemplarily shows a front view structural schematic diagram of the inside of the electric control box in the electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application; FIG. 3b exemplarily shows a front view structural schematic diagram of the outside of the electric control box in the electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application. FIG. 4 exemplarily shows a side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application. The above front view structural schematic diagram can be regarded as a structural schematic diagram of the electric control heat dissipation structure viewed from the side of the width direction W of the energy storage tank, and correspondingly, the side view structural schematic diagram can be regarded as a structural schematic diagram of the electric control heat dissipation structure viewed from the side of the length direction L of the energy storage tank.

[0046] Referring to FIG. 2, FIG. 3a, FIG. 3b and FIG. 4, the electric control heat dissipation structure of the liquid cooling unit provided by the embodiments of the present application comprises a frame 100, an electric control box 200, an air duct 300, a first heat sink 400 and a heat dissipation fan 500. Wherein, in the height direction H of the frame 100, the heat dissipation fan 500 is fixed to the top of the frame 100, the electric control box 200 is fixed to the bottom of the frame 100, and the first heat sink 400 is located between the heat dissipation fan 500 and the electric control box 200, i.e. the first heat sink 400 is located below the heat dissipation fan 500 and above the electric control box 200. The first heat sink 400 is used for heat exchange with the cooling liquid of the battery to dissipate heat of the battery, and the heat dissipation fan 500 is used for driving airflow to flow and carry away heat of the first heat sink 400. The electric control box 200 is provided with devices for controlling and driving components of the liquid cooling unit. Specifically, the inside of the electric control box 200 is provided with a controller 210, a driver 220 and a turbulence fan 230, the controller 210 is used for controlling the work of the driver 220 and controlling the rotation of the turbulence fan 230 and the heat dissipation fan 500, the driver 220 is used for driving components of the liquid cooling unit, such as driving the compressor of the first heat sink 400 to work, driving the water pump of the liquid cooling unit to work, etc. The turbulence fan 230 and the controller 210 are respectively arranged on different horizontal planes, i.e. the distance between the bottom of the turbulence fan 230 and the bottom of the electric control box 200 is different from the distance between the bottom of the controller 210 and the bottom of the electric control box 200, so that the turbulence fan 230 and the controller 210 are arranged in staggered layout in the height direction H. The outside of the electric control box 200 is provided with the air duct 300, the air duct 300 extends along the width direction W of the energy storage tank, and in the height direction H of the frame 100, the air duct 300 can take in air at the bottom and take out air at the top, so that the airflow can flow through the inside of the air duct 300 to carry away heat. The air duct 300 is provided with a second heat sink 240, the second heat sink 240 can be directly fixed to the outside side of the electric control box 200, the second heat sink 240 is used for dissipating heat for the driver 220 inside the electric control box 200, and the airflow flowing in the air duct 300 can carry away heat dissipated by the second heat sink 240.

[0047] In the present application, the electric control modules such as the controller 210 and the driver 220 are integrated and designed in a sealed metal shell to form the electric control box 200, which can meet the protection level requirements of outdoor applications. The electric control box 200 is provided with the turbulence fan 230, and the layout of the device in the electric control box 200 is optimized, i.e. the turbulence fan 230 and the controller 210 are arranged at different levels and are staggered in the height direction, so that the air circulation is realized in the electric control box 200 by the position relationship between the controller 210 and the turbulence fan 230, the air flow dead angle is avoided, the internal temperature of the electric control box 200 is uniformly distributed, the controller over-temperature is avoided, and the heat in the electric control box 200 can be dissipated through the metal shell of the electric control box 200, thereby improving the heat dissipation. Referring to the dashed arrow shown in the figure, the second radiator 240 arranged outside the electric control box 200 accelerates the heat conduction of the driver 220 to the outside of the electric control box 200, and the heat is taken away by the air flow circulating in the air duct 300. The heat dissipation fan 500 arranged at the top of the frame 100 can be one or more, and the air flow circulation speed of the first radiator 400 and the air duct 300 below can be accelerated by the air suction of the heat dissipation fan 500, so that most of the heat dissipated by the second radiator 240 in the air duct 300 can be taken away by the air flow, thereby ensuring the heat dissipation of the power system.

[0048] Referring to FIG. 3a, in some embodiments of the present application, the turbulence fan 230 and the driver 220 can be arranged side by side in the horizontal direction inside the electric control box 200. Specifically, the turbulence fan 230 and the driver 220 can be arranged side by side along the width direction W of the energy storage tank, which facilitates the turbulence fan 230 to circulate air directly to the driver 220 to dissipate heat for the driver 220. The turbulence fan 230 is arranged above the controller 210, and the air flow can circulate to the controller 210 below after passing through the driver 220, thereby realizing the circulation of the air flow in the electric control box 200, avoiding the air flow dead angle, ensuring the uniform distribution of the internal temperature of the electric control box 200, and avoiding the controller over-temperature.

[0049] Referring to FIG. 3a, in some embodiments of the present application, the driver 220 can specifically include: first drivers 221a, 221b and a second driver 222. Among them, the first drivers 221a, 221b are used to drive the compressors of the first heat sinks 400, so that the first heat sinks 400 exchange heat with the cooling liquid of the battery, and the number of the first drivers 221a, 221b corresponds to the number of the first heat sinks 400 one by one, for example, when two first heat sinks 400 are arranged, the first driver corresponds to two. The second driver 222 is used to drive the water pump of the liquid cooling unit. In the width direction W of the energy storage box, the spoiler fan 230 can be located between the first drivers 221a, 221b and the second driver 222, and the spoiler fan 230 is arranged to face the first drivers 221a, 221b. The circulating flow direction of the air flow in the electric control box 200 is shown by the arrow in FIG. 3a, the air flow circulates to the first drivers 221a, 221b through the spoiler fan 230, turns to the second driver 222 through the controller 210 below, and completes the circulating flow of the air flow in the electric control box 200 by using the air extraction function of the spoiler fan 230, avoiding the occurrence of air flow dead angle, ensuring the uniform distribution of the internal temperature of the electric control box 200, and avoiding the over-temperature of the controller.

[0050] Referring to FIG. 3b, in some embodiments of the present application, a second heat sink 240 can be attached to the position opposite to the driver 220 outside the electric control box 200 for heat dissipation by using heat-conducting adhesive. It can be considered that the second heat sink 240 is fixed to the outer side of the electric control box 200, and in the height direction H of the frame 100, the second heat sink 240 is located in the same horizontal plane as the driver 220. The second heat sink 240 can specifically adopt a fin heat sink, and the fin direction of the fin heat sink can be a vertical direction, that is, the fins extend along the vertical direction, that is, the height direction H, which is beneficial to reduce the resistance of the air flow in the air duct 300 in the process of flowing from bottom to top, so as to take away the heat dissipated by the fins in the process of air flow. The number of the second heat sink 240 can be set to be consistent with the number of the driver 220, for example, referring to FIG. 3b, when the number of the driver 220 is three, the second heat sink 240 can also be correspondingly arranged as three.

[0051] Referring to FIG. 4, in some embodiments of the present application, a frame body can be arranged on the side of the electric control box 200 close to the frame 100, and an air duct 300 can be arranged on the side of the electric control box 200 away from the frame 100. The air duct 300 can be composed of a first side wall, a second side wall and a third side wall which are connected in sequence and surround the periphery of the second heat sink 240. The first side wall and the third side wall are fixed to the outer side of the electric control box 200, and the second side wall connects the first side wall and the third side wall and is parallel to the outer side of the electric control box 200. The air duct 300 can be fixed to the outside of the electric control box 200 by bolts, which is convenient for disassembly, so as to regularly clean and maintain the dust of the second heat sink 240.

[0052] Referring to FIG. 4, in some embodiments of the present application, in order to accelerate the flow speed of the airflow inside the air duct 300, at least one driving fan 250 can be further arranged at the bottom of the air duct 300, the driving fan 250 blows air towards the inside of the air duct 300, accelerates the flow speed of the airflow inside the air duct 300, and cooperates with the air extraction function of the heat dissipation fan 500 at the top of the frame 100 to discharge the airflow from the top of the frame 100, which can improve the speed of the airflow flowing into the air duct 300, accelerate the circulation of the airflow inside the air duct 300, and take away more heat from the inside of the electric control box 200 conducted by the second heat sink 240.

[0053] FIG. 5 exemplarily shows another side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application.

[0054] Referring to FIG. 5, in some other embodiments of the present application, the driving fan 250 can be arranged obliquely at the bottom of the air duct 300, for example, the driving fan 250 can be inclined by 45 degrees with respect to the horizontal plane, so as to reduce the space occupied by the driving fan 250.

[0055] In the present application, the number of the driving fan 250 can be set according to the requirement, for example, referring to FIG. 2, two driving fans 250 can be arranged, each of which corresponds to the position of the gap between the adjacent two second heat sinks 240, so as to blow air to the adjacent two second heat sinks 240 by the driving fan 250.

[0056] FIG. 6 exemplarily shows another side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application.

[0057] Referring to FIG. 6, in some other embodiments of the present application, in the application scenarios where the ambient temperature requirement is not high, for example, the ambient temperature is lower than 50℃, or the driving heat generation is small, the number of the driving fan 250 can be reduced, or the driving fan 250 can be directly omitted, so as to reduce the heat dissipation cost. The airflow is directly driven to flow by the air volume of the heat dissipation fan 500 arranged at the top of the frame 100, a heat dissipation air duct is formed at the first heat sink 400 and the second heat sink 240, and the purpose of taking away the heat of the main heat generating elements is achieved.

[0058] FIG. 7 exemplarily shows another side view structural schematic diagram of the electric control heat dissipation structure of the liquid cooling unit provided in the embodiments of the present application.

[0059] Referring to FIGS. 4-6, in some embodiments of the present application, in order to facilitate heat dissipation and air flow circulation, a plurality of first heat sinks 400 can be provided, for example, two first heat sinks 410 and 420, and the bottom ends of the two first heat sinks 410 and 420 form an acute angle, and the two first heat sinks 410 and 420 can be fixed at the bottom end by a connecting piece 430. The heat dissipation fan 500 located at the top of the frame 100 can drive the air flow to flow and carry away the heat dissipated by the first heat sinks 410 and 420.

[0060] In embodiments of the present application, the specific layout of the first heat sink 400 can be adjusted according to the specific application environment, for example, referring to FIGS. 4-6, when the opposite sides of the frame 100 are not blocked and can intake air A, the two first heat sinks 410 and 420 can be symmetrically arranged. In some embodiments of the present application, when the frame 100 can only intake air A on one side, for example, referring to FIG. 7, the right side cannot intake air, in order to ensure the heat dissipation effect of the first heat sink 410 on the right side, the first heat sink 420 can be placed vertically to increase the area and air intake of the first heat sink 410 and improve the heat dissipation effect of the first heat sink 410. Overall, the bottom of the two first heat sinks 410 and 420 can be arranged close to the side of the frame where air A can be taken in.

[0061] Referring to FIG. 2, in some embodiments of the present application, a pure inductance scheme can be used to realize harmonic processing in the electrically controlled heat dissipation structure. Specifically, the electric reactor 600 is fixed to the bottom of the frame 100, and the electric reactor 600 is arranged side by side with the electric control box 200 in the width direction W of the energy storage tank. In order to meet the protection level requirements of the outdoor application of the electric reactor 600, the electric reactor 600 can be filled with glue outside to form a heat-conducting glue, and the heat-conducting coefficient of the heat-conducting glue can be 0.7W / mK or 1.5W / mK. After the heat is transmitted to the shell through the heat-conducting glue, the heat dissipation fins arranged along the horizontal direction, i.e., the heat dissipation fins 610, are arranged horizontally outside the heat-conducting glue. The heat dissipation air duct formed by the heat dissipation fan 500 at the top of the frame 100 and the first heat sink 400 can carry away the heat of the electric reactor 600. The heat dissipation fins 610 can also be protected by an open mesh cover 620 outside. The mesh cover can prevent burns and avoid direct contact between the maintenance personnel and the shell of the electric reactor 600.

[0062] The above-mentioned liquid cooling unit and energy storage tank for dissipating heat from the battery provided by the present application seal the controller, the driver and the turbulence fan in the electric control box, and use the way of arranging the controller and the turbulence fan in the electric control box in the height direction to form air circulation in the electric control box, so as to keep the temperature in the electric control box uniform and avoid over-temperature operation of the controller. Moreover, the air duct outside the electric control box and the second heat sink arranged in the air duct can cooperate with the air extraction function of the heat dissipation fan at the top and the heat dissipation function of the first heat sink to carry away most of the heat and ensure the heat dissipation of the power system.

[0063] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A liquid cooling unit for cooling a battery, characterized by, The application relates to a liquid cooling unit for heat dissipation of a battery. The liquid cooling unit comprises a frame, an electric control box, an air duct, a first heat sink and a heat dissipation fan. The heat dissipation fan is fixed to the top of the frame in the height direction of the frame, the electric control box is fixed to the bottom of the frame, and the first heat sink is located between the heat dissipation fan and the electric control box. The first heat sink is used for heat exchange with cooling liquid of the battery, and the heat dissipation fan is used for driving heat of the first heat sink. The electric control box is internally provided with a controller, a driver and a turbulence fan, the controller is used for controlling the driver and the rotation of the turbulence fan, the driver is used for driving components of the liquid cooling unit, the turbulence fan and the controller are arranged on different horizontal planes, and the electric control box is externally provided with the air duct, and a second heat sink is arranged in the air duct.

2. The liquid chiller unit of claim 1, wherein, In the electric control box, the turbulence fan and the driver are arranged side by side in the horizontal direction, and the turbulence fan is arranged above the controller.

3. The liquid chiller unit of claim 2, wherein, The driver comprises a first driver and a second driver, the first driver is used for driving a compressor of the first heat sink, and the second driver is used for driving a water pump of the liquid cooling unit. The turbulence fan is located between the first driver and the second driver, and the turbulence fan faces the first driver.

4. The liquid chiller unit of any of claims 1-3, wherein, The second heat sink is fixed to the external side of the electric control box, and in the height direction of the frame, the second heat sink is located on the same horizontal plane as the driver.

5. The liquid chiller unit of any of claims 1-4, wherein, The air duct comprises a first side wall, a second side wall and a third side wall which are arranged in sequence and surround the periphery of the second heat sink, the first side wall and the third side wall are fixed to the external side of the electric control box, and the second side wall connects the first side wall and the third side wall and is parallel to the external side of the electric control box.

6. The liquid chiller unit of claim 5, wherein, The application further relates to the following: At least one driving fan is arranged at the bottom of the air duct and faces the inside of the air duct.

7. The liquid chiller unit of claim 6, wherein, The at least one driving fan is arranged in an inclined manner at the bottom of the air duct.

8. The liquid chiller unit of any of claims 1-7, wherein, The first heat sink is two, and the bottom end of the two first heat sinks has an acute angle and is fixed through a connecting piece.

9. The liquid chiller unit of any of claims 1-8, wherein, The application further relates to the following: An electric reactor is fixed to the bottom of the frame and arranged side by side with the electric control box. The electric reactor is externally packaged with heat-conducting glue, the heat dissipation fins are arranged on the outside of the heat-conducting glue and extend along the horizontal direction, and the second heat sink is externally provided with an open mesh cover.

10. The liquid chiller unit of any of claims 1-9, wherein, The second heat sink is a fin heat sink with fins extending along the vertical direction.

11. An energy storage tank characterized by, The application relates to a battery and a liquid cooling unit for heat dissipation of the battery. ​

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