Energy storage system and energy storage power station

Abstract

Provided in the present application are an energy storage system (1000) and an energy storage power station. The energy storage system (1000) comprises a battery module (100), a converter (200) and a cooling device (300), wherein a cooling unit (310) of the cooling device (300) is connected to a first liquid inlet (111) and a second liquid outlet (212) by means of pipelines. A bypass structure (320) is configured to be in communication with a first liquid outlet (112) and a second liquid inlet (211), and can bypass part of a coolant, which is discharged from the first liquid outlet (112), to the outside of the second liquid inlet (211); therefore, only part of the coolant enters a second cooling structure (210) from a first cooling structure (110), such that only using one cooling device (300) can meet different flow requirements of both the first cooling structure (110) and the second cooling structure (210), thereby effectively reducing the cost of the energy storage system (1000).

Description

Energy storage systems and energy storage power stations

[0001] This application refers to Chinese patent application No. 202321658256.2, filed on June 28, 2023, entitled “Energy Storage System and Energy Storage Power Station,” which is incorporated herein by reference in its entirety. Technical Field

[0002] The present application relates to the technical field of energy storage system cooling, and in particular provides an energy storage system and an energy storage power station. Background Art

[0003] The energy storage system mainly includes equipment such as battery modules and inverters. During operation, battery modules, inverters and other equipment will generate heat and require a cooling system to cool them down.

[0004] In related technologies, since the battery modules and converters of an energy storage power station have different requirements for coolant flow and pressure, two cooling systems are required to simultaneously meet the different flow and pressure requirements of the coolant, resulting in high development and manufacturing costs for the energy storage system.

[0005] Application Contents

[0006] The purpose of the embodiments of the present application is to provide an energy storage system and an energy storage power station, aiming to solve the problem in the related art that the battery modules and converters of the energy storage system have different flow requirements for coolant, resulting in the need for two cooling systems and the resulting high cost.

[0007] The technical solution adopted in the embodiment of this application is:

[0008] In a first aspect, an embodiment of the present application provides an energy storage system, comprising a battery module, an inverter and a cooling device, wherein the battery module comprises a first cooling structure having a first liquid inlet and a first liquid outlet, and the inverter comprises a second cooling structure having a second liquid inlet and a second liquid outlet; the cooling device comprises a cooling unit and a bypass structure, wherein the liquid outlet end of the cooling unit is connected to the first liquid inlet through a pipeline, and the liquid inlet end of the cooling unit is connected to the second liquid outlet through a pipeline; the bypass structure is configured to be connected to the first liquid outlet and the second liquid inlet, and the bypass structure is further configured to bypass part of the cooling liquid discharged from the first liquid outlet to the outside of the second liquid inlet.

[0009] The beneficial effects of the embodiments of the present application: The energy storage system provided by the embodiments of the present application, the cooling unit can introduce the coolant and flow it through the first cooling structure and the second cooling structure in sequence to achieve heat dissipation for the battery module and the inverter respectively; after the coolant is discharged from the first liquid outlet of the first cooling structure, part of the coolant can be bypassed to the outside of the second liquid inlet by the bypass structure, so that only part of the coolant discharged from the first cooling structure can enter the second cooling structure from the second liquid inlet, that is, the flow rate of the coolant flowing through the second cooling structure is less than the flow rate of the coolant flowing through the first cooling structure, and the different flow requirements of the first cooling structure and the second cooling structure can be met, so that only one set of cooling devices can simultaneously introduce coolant to the first cooling structure of the battery module and the second cooling structure of the inverter to achieve the cooling purpose, so there is no need to use two sets of cooling devices to separately introduce coolant to the first cooling structure of the battery module and the second cooling structure of the inverter, which effectively reduces the cost of the energy storage system.

[0010] In some embodiments, the bypass structure has a bypass end connected to the liquid inlet end of the cooling unit.

[0011] By adopting the above-mentioned technical solution, the bypass end of the bypass structure can bypass part of the coolant discharged from the first liquid outlet of the first cooling structure to the liquid inlet end of the cooling unit, so that this part of the coolant flows through the first cooling structure and directly returns to the cooling unit for cooling and circulation.

[0012] In some embodiments, the bypass structure is a three-way valve, which includes a first valve port, a second valve port and a third valve port. The first valve port is connected to the first liquid outlet, the second valve port is connected to the second liquid inlet, the third valve port is the bypass end, and the third valve port is connected to the liquid inlet end of the cooling unit.

[0013] By adopting the above technical solution, the bypass structure is a three-way valve, the first liquid outlet is connected to the first valve port, and the first liquid outlet can introduce the coolant flowing through the first cooling structure into the three-way valve; the second valve port is connected to the second liquid inlet, and the third valve port is connected to the liquid inlet end of the cooling unit, the second valve port can introduce part of the coolant entering the three-way valve into the second liquid inlet and flow through the second cooling structure, and the third valve port can directly introduce the other part of the coolant entering the three-way valve into the cooling unit for cooling and circulation.

[0014] In some embodiments, the cooling device further includes a hydraulic pressure adjustment mechanism configured to adjust a hydraulic pressure difference between the coolant in the first cooling structure and the coolant in the second cooling structure.

[0015] By adopting the above technical solution, the hydraulic adjustment mechanism is used to adjust the hydraulic pressure difference between the coolant in the first cooling structure and the coolant in the second cooling structure, so as to meet the different hydraulic pressure requirements of the battery module and the converter for the coolant.

[0016] In some embodiments, the hydraulic adjustment mechanism includes a pad; in the direction of gravity, when the pad is configured to be set at the bottom of the first cooling structure, the height of the first cooling structure is greater than the height of the second cooling structure; or, in the direction of gravity, when the pad is configured to be set at the bottom of the second cooling structure, the height of the second cooling structure is greater than the height of the first cooling structure.

[0017] By adopting the above-mentioned technical solution, the first cooling structure or the second cooling structure is raised by using a pad to form a height difference between the first cooling structure and the second cooling structure in the direction of gravity. It can be understood that in the direction of gravity, the higher the height, the smaller the hydraulic pressure of the coolant. Therefore, by adjusting the height difference between the first cooling structure and the second cooling structure in the direction of gravity, the purpose of adjusting the hydraulic pressure difference between the coolant in the first cooling structure and the coolant in the second cooling structure can be achieved, thereby meeting the different hydraulic pressure requirements of the battery module and the converter for the coolant.

[0018] In some embodiments, the spacer has insulating properties.

[0019] By adopting the above technical solution, since the pad has insulating properties, when the pad is placed on the ground, the insulation level of the battery module or the converter to the ground can be improved.

[0020] In some embodiments, the hydraulic adjustment mechanism includes a pressure reducing structure, which is disposed between the second liquid inlet and the first liquid outlet.

[0021] By adopting the above-mentioned technical solution, the pressure reducing structure is arranged between the second liquid inlet and the first liquid outlet. When the coolant is introduced into the second liquid inlet, the hydraulic pressure will first be reduced by the pressure reducing structure, so that the hydraulic pressure of the coolant introduced into the second liquid inlet and flowing through the second cooling structure is lower than the hydraulic pressure of the coolant flowing through the first cooling structure, thereby being able to meet the different hydraulic requirements of the battery module and the converter for the coolant.

[0022] In some embodiments, the hydraulic adjustment mechanism includes a pressurizing structure, and the pressurizing structure is arranged between the liquid outlet and the first liquid inlet of the cooling unit.

[0023] By adopting the above technical solution, the coolant is introduced into the first cooling structure after being pressurized, and the coolant discharged from the first cooling structure is introduced into the second cooling structure after being depressurized, thereby meeting the different hydraulic requirements of the battery module and the converter for the coolant.

[0024] In some embodiments, the hydraulic adjustment mechanism includes a pressure-boosting structure, which is disposed between the second liquid inlet and the first liquid outlet.

[0025] By adopting the above-mentioned technical solution, the boosting structure is arranged between the second liquid inlet and the first liquid outlet. When the coolant is introduced into the second liquid inlet, the hydraulic pressure will first be enhanced by the boosting structure, so that the hydraulic pressure of the coolant introduced into the second liquid inlet and flowing through the second cooling structure is higher than the hydraulic pressure of the coolant flowing through the first cooling structure, thereby being able to meet the different hydraulic requirements of the battery module and the converter for the coolant.

[0026] In some embodiments, the hydraulic adjustment mechanism includes a pressure reducing structure, which is disposed between the liquid outlet and the first liquid inlet of the cooling unit.

[0027] By adopting the above technical solution, the coolant is introduced into the first cooling structure after being depressurized, and the coolant discharged from the first cooling structure is then pressurized and introduced into the second cooling structure, thereby meeting the different hydraulic requirements of the battery module and the converter for the coolant.

[0028] In a second aspect, an embodiment of the present application further provides an energy storage power station, which includes at least the energy storage system as described above.

[0029] Beneficial effects of the embodiments of the present application: The energy storage power station provided by the embodiments of the present application includes the above-mentioned energy storage system. Since the energy storage system can use a set of cooling devices to introduce coolant to the first cooling structure of the battery module and the second cooling structure of the converter to achieve cooling purposes, the cost of the energy storage system can be effectively reduced, and therefore, the cost of the energy storage power station can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or related technologies. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is a schematic structural diagram of an energy storage system provided in one embodiment of the present application;

[0032] FIG2 is a schematic structural diagram of an energy storage system provided in one embodiment of the present application;

[0033] FIG3 is a schematic structural diagram of an energy storage system provided in one embodiment of the present application;

[0034] FIG4 is a schematic structural diagram of an energy storage system provided in one embodiment of the present application;

[0035] FIG5 is a schematic structural diagram of an energy storage system provided in one embodiment of the present application;

[0036] FIG6 is a schematic structural diagram of an energy storage system provided in an embodiment of the present application including multiple energy storage subsystems.

[0037] Among them, the reference numerals in the figures are:

[0038] 1000. Energy storage system;

[0039] 100, battery module; 110, first cooling structure; 111, first liquid inlet; 112, first liquid outlet;

[0040] 200, converter; 210, second cooling structure; 211, second liquid inlet; 212, second liquid outlet;

[0041] 300, cooling device; 310, cooling unit; 320, bypass structure; 321, bypass terminal;

[0042] 410, pad; 420, pressure relief structure; 430, pressure relief structure;

[0043] G. Direction of gravity. DETAILED DESCRIPTION

[0044] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the terms "length", "width", "thickness", "inside", "outside", "up", "down", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0047] The terms "first," "second," and the like are used solely for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. For example, the terms "first guide member" and "second guide member" are used solely to distinguish between the different guide members and do not define their order. The first guide member could also be named "second guide member," and the second guide member could also be named "first guide member" without departing from the scope of the various described embodiments. Furthermore, the terms "first," "second," and the like do not necessarily specify that the features being referred to are different.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. The meaning of "plurality" is at least two, that is, two or more.

[0049] In this application, "and / or" is simply a way to describe the relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0050] It should be noted that, in this application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described in this application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example" is intended to present related concepts in a concrete way, meaning that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In order to make the purpose, technical solutions and advantages of this application more clear, this application is further described in detail below with reference to the accompanying drawings and embodiments.

[0052] Energy storage is a crucial equipment foundation and key supporting technology for building a new power system and promoting a green, low-carbon energy transition. As my country's renewable energy generation and installed capacity continue to increase, the "renewable energy + energy storage" model will play an increasingly important role in regulating and safeguarding the power system.

[0053] Energy storage systems include devices such as battery modules and converters. These devices generate heat during operation, necessitating a cooling system to maintain temperature. Both the battery modules and converters have cooling structures, such as water-cooled plates, for coolant to flow through. Coolant from the cooling system is passed through the battery module and converter cooling structures, effectively cooling the battery modules and converter.

[0054] However, the power of the battery module and the inverter of the energy storage system are basically the same, and the conversion efficiency of the inverter is generally slightly greater than that of the battery module. Therefore, the heat generation power of the inverter is less than that of the battery module. Therefore, according to the different heat generation power, the heat dissipation requirements of the battery module and the inverter are different, and the pipe diameters of the liquid cooling channel of the liquid cooling structure of the battery module and the liquid cooling structure of the inverter are also different. Therefore, the battery module and the inverter have different requirements for the flow rate of the coolant, and the requirements for the coolant of the battery module and the inverter may differ by about ten times. Simply connecting the cooling structure of the battery module and the cooling structure of the inverter will cause at least one of them to fail to meet the cooling requirements.

[0055] In related technologies, in order to simultaneously meet the flow and pressure requirements of the battery module and the converter for the coolant, two cooling systems with different parameters are generally used to act on the battery module and the converter respectively. The use of two cooling systems to act on the battery module and the converter respectively has a significant impact on the development and manufacturing costs of the energy storage system, resulting in an increase in the cost of the energy storage system.

[0056] Based on the above considerations, in order to solve the problem of high costs caused by the need for two cooling systems due to different flow requirements of the coolant for the battery modules and converters of the energy system, an energy storage system is designed. A bypass structure is set between the first liquid outlet of the first cooling structure and the second liquid inlet of the second cooling structure. The bypass structure can bypass part of the coolant discharged from the first liquid outlet to the outside of the second liquid inlet, that is, only part of the coolant discharged from the first liquid outlet enters the second liquid inlet, so as to achieve the effect of different flow rates of the coolant in the first cooling structure and the second cooling structure, thereby meeting the different flow requirements of the first cooling structure and the second cooling structure.

[0057] The energy storage system disclosed in the embodiments of this application can be used, but is not limited to, in fixed or mobile energy stations, such as energy storage containers, energy storage distribution cabinets, energy storage power stations, and battery swap stations. In some embodiments, the energy storage system may also include other functional compartments, such as a control compartment and a firefighting compartment. The control compartment is used to manage batteries to achieve the storage and output of electrical energy.

[0058] Below, the energy storage system provided in the embodiments of the present application will be introduced and explained.

[0059] Please refer to Figure 1. An embodiment of the present application provides an energy storage system 1000, including a battery module 100, an inverter 200 and a cooling device 300. The battery module 100 includes a first cooling structure 110, and the first cooling structure 110 has a first liquid inlet 111 and a first liquid outlet 112. The inverter 200 includes a second cooling structure 210, and the second cooling structure 210 has a second liquid inlet 211 and a second liquid outlet 212.

[0060] The battery module 100 included in the energy storage system 1000 disclosed in the embodiment of the present application is formed by connecting battery cells in series and parallel. In one embodiment, the battery cell includes an end cover, a shell and a battery cell assembly. The end cover and the shell enclose a receiving cavity, and the battery cell assembly is arranged in the receiving cavity. The battery cell assembly is a component in the battery cell where an electrochemical reaction occurs. The battery cell assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a diaphragm is usually provided between the positive electrode sheet and the negative electrode sheet. During the charge and discharge process of the battery, the active material on the positive electrode sheet and the active material on the negative electrode sheet react with the electrolyte to form an electric current.

[0061] The battery module 100 is a module formed by connecting battery cells in series and / or in parallel. In the embodiment of the present application, it is understandable that the battery module 100 is equipped with a first cooling structure 110 for circulating coolant. The first cooling structure 110 can be set on the battery module 100 formed by connecting a number of battery cells in series and / or in parallel, or on a single battery cell, or on a box / cabinet that accommodates all battery cells / battery modules 100. When the coolant circulates in the first cooling structure 110, the battery module 100 is cooled by the first cooling structure 110, and the heat generated by the battery module 100 during operation is taken away. The first cooling structure 110 can be, but is not limited to, a tube structure, a plate structure, etc. The first cooling structure 110 has a first liquid inlet 111 and a first liquid outlet 112. The coolant can flow into the first cooling structure 110 from the first liquid inlet 111 and flow out of the first cooling structure 110 from the first liquid outlet 112.

[0062] The converter 200 is an electrical device that changes the voltage, frequency, number of phases, and other electrical quantities or characteristics of the power supply system. It is understood that the converter 200 is equipped with a second cooling structure 210 through which coolant circulates. When the coolant circulates within the second cooling structure 210, it cools the converter 200 through the second cooling structure 210, removing the heat generated by the converter 200 during operation. The second cooling structure 210 can be, but is not limited to, a tube structure, a plate structure, etc. The second cooling structure 210 has a second liquid inlet 211 and a second liquid outlet 212. Coolant can flow into the second cooling structure 210 from the second liquid inlet 211 and out of the second cooling structure 210 from the second liquid outlet 212.

[0063] The cooling device 300 includes a cooling unit 310 and a bypass structure 320. The liquid outlet end of the cooling unit 310 is connected to the first liquid inlet 111 through a pipeline, and the liquid inlet end of the cooling unit 310 is connected to the second liquid outlet 212 through a pipeline; the bypass structure 320 is configured to be connected to the first liquid outlet 112 and the second liquid inlet 211, and the bypass structure 320 is also configured to bypass part of the cooling liquid discharged from the first liquid outlet 112 to the outside of the second liquid inlet 211.

[0064] The cooling unit 310 is used to provide coolant and to further cool the cooling liquid that has been cooled and returned. The liquid outlet of the cooling unit 310 refers to the outlet port of the cooling unit 310 for outputting the coolant, and the liquid outlet of the cooling unit 310 refers to the inlet port of the cooling unit 310 for introducing the returning coolant.

[0065] The above-mentioned pipeline is a pipeline structure for circulating the cooling liquid.

[0066] The liquid outlet of the cooling unit 310 is connected to the first liquid inlet 111 via a pipeline. This means that the cooling unit 310 can introduce coolant into the first liquid inlet 111, allowing the coolant to flow into the first cooling structure 110 and dissipate heat from the battery module 100. The liquid inlet of the cooling unit 310 is connected to the second liquid outlet 212 via a pipeline. This means that the coolant, which has sequentially flowed through the first cooling structure 110 and the second cooling structure 210 and absorbed heat and cooled the battery module 100, can then flow out of the second liquid outlet 212 and flow back into the cooling unit 310. The cooling unit 310 then cools the returned coolant so that it can be discharged again from the liquid outlet of the cooling unit 310 at a predetermined temperature.

[0067] The bypass structure 320 is used to bypass the coolant discharged from the first liquid outlet 112 of the first cooling structure 110, so that part of the coolant discharged from the first liquid outlet 112 is directed into the second liquid inlet 211 of the second cooling structure 210, and the other part is discharged outside the second liquid inlet 211. This achieves the purpose of differentiating the flow rate of the coolant flowing through the first cooling structure 110 and the coolant flowing through the second cooling structure 210. The bypass operation mentioned above refers to separating a branch of the fluid flowing from the first liquid outlet 112 to the second liquid inlet 211 and flowing it to the outside.

[0068] Specifically, the bypass structure 320 can be a multi-way valve, for example, a three-way valve, two of the valve ports of the three-way valve are respectively connected to the first liquid outlet 112 and the second liquid inlet 211, and the other valve port of the three-way valve is connected to the outside, so that only a part of the coolant discharged from the first liquid outlet 112 flows into the second liquid inlet 211; or, the bypass structure 320 can also be a shunt pipe, which is connected to the pipeline between the first liquid outlet 112 and the second liquid inlet 211. In the process of the coolant flowing from the first liquid outlet 112 to the second liquid inlet 211, the coolant can flow out of the shunt pipe, so that the coolant flowing into the second liquid inlet 211 only accounts for the part of the coolant flowing out of the first liquid outlet 112.

[0069] The number of the bypass structures 320 may be one or more. When the number of the bypass structures 320 is multiple, the multiple bypass structures 320 may be sequentially connected in series between the first liquid outlet 112 and the second liquid inlet 211 .

[0070] In the energy storage system 1000 provided in the embodiment of the present application, the cooling unit 310 can introduce the coolant and flow it through the first cooling structure 110 and the second cooling structure 210 in sequence to respectively realize heat dissipation of the battery module 100 and the converter 200; after the coolant is discharged from the first liquid outlet 112 of the first cooling structure 110, part of the coolant can be bypassed to the outside of the second liquid inlet 211 by the bypass structure 320, so that only part of the coolant discharged from the first cooling structure 110 can enter the second cooling structure 210 from the second liquid inlet 211, that is, the coolant flowing through the second cooling structure 210 is The flow rate of the coolant is less than the flow rate of the coolant flowing through the first cooling structure 110, and the flow limits of the first cooling structure 110 and the second cooling structure 210 can be met, so that only one set of cooling devices 300 can be used to simultaneously introduce coolant to the first cooling structure 110 of the battery module 100 and the second cooling structure 210 of the converter 200 to achieve the cooling purpose. Therefore, there is no need to use two sets of cooling devices 300 to separately introduce coolant to the first cooling structure 110 of the battery module 100 and the second cooling structure 210 of the converter 200, thereby effectively reducing the cost of the energy storage system 1000.

[0071] Referring to FIG. 1 , in some embodiments, the bypass structure 320 has a bypass end 321 , and the bypass end 321 is connected to the liquid inlet end of the cooling unit 310 .

[0072] It can be understood that the bypass structure 320 can bypass the coolant discharged from the first liquid outlet 112 of the first cooling structure 110, so that part of the coolant discharged from the first liquid outlet 112 is introduced into the second liquid inlet 211 of the second cooling structure 210, and the other part is discharged outside the second liquid inlet 211.

[0073] The bypass end 321 refers to an output port on the bypass structure 320 for directing the coolant from the first liquid outlet 112 to the outside of the second liquid inlet 211. For example, when the bypass structure 320 is a three-way valve, the bypass end is one of the valve ports of the three-way valve, which is connected to the outside of the first liquid outlet 112 and the second liquid inlet 211, so that the coolant from the first liquid outlet 112 can be directed to the outside of the second liquid inlet 211.

[0074] Specifically, the bypass structure 320 directly guides part of the coolant directed out of the second liquid inlet 211 into the liquid inlet of the cooling unit 310 , so that all the coolant can flow back into the cooling unit 310 for recycling.

[0075] For example, in some specific embodiments, the bypass structure 320 can be a three-way valve, two of the valve ports of the three-way valve are connected to the first liquid outlet 112 and the second liquid outlet 212 respectively, and the other valve port of the three-way valve is connected to the liquid inlet end of the cooling unit 310; the coolant is discharged from the liquid outlet end of the cooling unit 310 and then introduced into the first liquid inlet 111, and the coolant can flow through the first cooling structure 110 and cool the battery module 100; the coolant flowing through the first cooling structure 110 can be discharged from the first liquid outlet 112, and the coolant is partially introduced into the In the second liquid inlet 211, another part of the coolant is introduced into the liquid outlet end of the cooling unit 310 through the three-way valve; the coolant introduced into the second liquid inlet 211 can flow through the second cooling structure 210 and cool the converter 200; the coolant flow rate flowing through the second cooling structure 210 is less than the flow rate flowing through the first cooling structure 110, so that only one set of cooling units 310 can be used to connect the first cooling structure 110 and the second cooling structure 210 in sequence, and the different coolant flow requirements of the first cooling structure 110 and the second cooling structure 210 can be met.

[0076] The cooling unit 310 is a device for cooling the coolant. Cooling unit 310 can be a cooling tower. A cooling tower utilizes the heat exchange between the coolant and air to generate steam. The steam evaporates and removes heat, dissipating the coolant's temperature through evaporative heat dissipation, convection heat transfer, and radiation heat transfer, ensuring proper cooling. Specifically, the coolant can be, but is not limited to, cooling water, cooling oil, or the like.

[0077] It is understandable that a water pump may be provided between the liquid outlet of the cooling unit 310 and the first liquid inlet 111 to pump the coolant into the first cooling structure 110 .

[0078] In this configuration, the bypass end 321 of the bypass structure 320 can bypass part of the coolant discharged from the first liquid outlet 112 of the first cooling structure 110 to the liquid inlet end of the cooling unit 310, so that this part of the coolant flows through the first cooling structure 110 and then directly flows back to the cooling unit 310 for cooling and circulation.

[0079] Please refer to Figure 1. In some embodiments, the bypass structure 320 is a three-way valve, which includes a first valve port, a second valve port and a third valve port. The first valve port is connected to the first liquid outlet 112, the second valve port is connected to the second liquid inlet 211, and the third valve port is the bypass end, which is connected to the liquid inlet end of the cooling unit 310.

[0080] A three-way valve is a valve device with three ports, one for inlet and two for outlet. Specifically, in this embodiment, the first port serves as an inlet for coolant flow, while the second and third ports serve as outlets for coolant flow. The third port can also serve as a bypass port 321, diverting some coolant to the cooling unit 310.

[0081] Specifically, during the cooling operation, after the coolant is discharged from the cooling unit 310 and flows through the first cooling structure 110, the coolant is discharged from the first liquid outlet 112 to the first valve port of the three-way valve. The coolant entering the three-way valve will flow out of the three-way valve in two layers from the second valve port and the third valve port. One stream of coolant flowing out of the second valve port can be introduced into the second liquid inlet 211 and flow through the second cooling structure 210, and then flow out from the second liquid outlet 212 and flow back to the cooling unit 310. The other stream of coolant flowing out of the third valve port can directly flow back to the cooling unit 310, thereby achieving the purpose of different flow rates of the coolant flowing through the first cooling structure 110 and the coolant flowing through the second cooling structure 210.

[0082] Referring to FIG. 2 to FIG. 5 , in some embodiments, the cooling device 300 further includes a hydraulic adjustment mechanism configured to adjust a hydraulic pressure difference between the coolant in the first cooling structure 110 and the coolant in the second cooling structure 210 .

[0083] It can be understood that the hydraulic adjustment mechanism can adjust the hydraulic difference between the coolant in the first cooling structure 110 and the coolant in the second cooling structure 210 to meet the hydraulic difference between the coolant in the first cooling structure 110 and the coolant in the second cooling structure 210 under different conditions.

[0084] Specifically, the hydraulic regulating mechanism may include a boosting device for increasing the hydraulic pressure of the coolant, such as a boosting valve, a boosting pump, etc.; the hydraulic regulating mechanism may also include a pressure reducing device for reducing the hydraulic pressure of the coolant, such as a pressure reducing pipeline, a pressure reducing valve, etc., wherein the above-mentioned pressure reducing pipeline may be a pipeline structure with a pipeline cross-sectional area tending to increase. When the coolant flows, the larger the cross-sectional area of ​​the pipeline, the smaller the hydraulic pressure of the coolant; or, the hydraulic regulating mechanism may also include a pad, which is used to raise the first cooling structure 110 and the second cooling structure 210 to different heights, so that the hydraulic pressure of the coolant flowing through the first cooling structure 110 or the second cooling structure 210 with a higher height is smaller.

[0085] Among them, the hydraulic adjustment mechanism can be arranged between the liquid outlet end of the cooling unit 310 and the first liquid inlet 111, and the hydraulic adjustment mechanism can hydraulically adjust the coolant in the first cooling structure 110; or, the hydraulic adjustment mechanism can be arranged between the first liquid outlet 112 and the second liquid inlet 211, and the hydraulic adjustment mechanism can hydraulically adjust the coolant in the second cooling structure 210; or, the hydraulic adjustment mechanism can be arranged between the liquid outlet end of the cooling unit 310 and the first liquid inlet 111 and between the first liquid outlet 112 and the second liquid inlet 211 at the same time, and the hydraulic adjustment mechanism can hydraulically adjust the coolant in the first cooling structure 110 and the coolant in the second cooling structure 210 at the same time.

[0086] With this arrangement, the hydraulic adjustment mechanism is used to adjust the hydraulic pressure difference between the coolant in the first cooling structure 110 and the coolant in the second cooling structure 210 to meet the different hydraulic pressure requirements of the battery module 100 and the converter 200 for the coolant.

[0087] 1 and 5 , in some embodiments, the hydraulic adjustment mechanism includes a pad 410 . In the direction of gravity G, when the pad 410 is configured to be disposed at the bottom of the first cooling structure 110 , the height of the first cooling structure 110 is greater than the height of the second cooling structure 210 .

[0088] It can be understood that the pad 410 can be arranged at the bottom of the first cooling structure 110 in the gravity direction G, so that the first cooling structure 110 is raised in the gravity direction G, and the first cooling structure 110 is higher than the second cooling structure 210 in the gravity direction G, that is, there is a height difference between the first cooling structure 110 and the second cooling structure 210; it should be understood that the coolant needs to overcome gravity when flowing to a high place, so the higher the height, the smaller the hydraulic pressure of the coolant, and the hydraulic pressure of the coolant flowing through the first cooling structure 110 and the hydraulic pressure of the coolant flowing through the second cooling structure 210 form a hydraulic difference, and the hydraulic pressure of the coolant flowing through the first cooling structure 110 is less than the hydraulic pressure of the coolant flowing through the second cooling structure 210.

[0089] Specifically, the spacer 410 may be disposed below the battery module 100 to raise the entire battery module 100 , thereby raising the first cooling structure 110 .

[0090] 1 and 4 , in some embodiments, the hydraulic adjustment mechanism includes a pad 410 . In the direction of gravity, when the pad 410 is configured to be disposed at the bottom of the second cooling structure 210 , the height of the second cooling structure 210 is greater than the height of the first cooling structure 110 .

[0091] It can be understood that the pad 410 can be arranged at the bottom of the second cooling structure 210 in the gravity direction G, so that the second cooling structure 210 is raised in the gravity direction G, and the second cooling structure 210 is higher than the first cooling structure 110 in the gravity direction G, that is, there is a height difference between the first cooling structure 110 and the second cooling structure 210, so that the hydraulic pressure of the coolant flowing through the first cooling structure 110 and the hydraulic pressure of the coolant flowing through the second cooling structure 210 form a hydraulic difference, and the hydraulic pressure of the coolant flowing through the second cooling structure 210 is less than the hydraulic pressure of the coolant flowing through the first cooling structure 110.

[0092] Specifically, the pad 410 can be set below the converter 200 to raise the converter 200 as a whole, so that the second cooling structure 210 can be raised; or, the pad 410 can be set inside the converter 200 and below the second cooling structure 210, and the pad 410 can raise the second cooling structure 210.

[0093] In this configuration, the pad 410 is used to raise the first cooling structure 110 or the second cooling structure 210, so that a height difference is formed between the first cooling structure 110 and the second cooling structure 210 in the gravity direction G. It can be understood that in the gravity direction G, the higher the height, the smaller the hydraulic pressure of the coolant. Therefore, by adjusting the height difference between the first cooling structure 110 and the second cooling structure 210 in the gravity direction G, the purpose of adjusting the hydraulic pressure difference between the coolant in the first cooling structure 110 and the coolant in the second cooling structure 210 can be achieved, thereby meeting the different hydraulic pressure requirements of the battery module 100 and the converter 200 for the coolant.

[0094] 4 and 5 , in some embodiments, the spacer 410 has insulating properties.

[0095] It can be understood that the gasket 410 can be, but is not limited to, an inorganic insulating gasket (such as a ceramic gasket, a mica gasket, a glass gasket, etc.), an organic insulating gasket (such as a rubber gasket, a resin gasket, etc.), a hybrid insulating gasket (a gasket formed by combining two or more insulating materials), etc.

[0096] The number of the spacer block 410 may be one or more. Only one spacer block 410 may be used to elevate the first cooling structure 110 or the second cooling structure 210 , or multiple spacers 410 may be used to elevate the first cooling structure 110 or the second cooling structure 210 .

[0097] With this configuration, since the pad 410 has insulating properties, when the pad 410 is placed on the ground, the insulation level of the battery module 100 or the converter 200 to the ground can be improved.

[0098] For example, in some specific embodiments, the hydraulic adjustment mechanism includes a pad 410, which is insulating and is padded to the bottom of the converter 200 so that the converter 200 is raised as a whole. Thus, in the direction of gravity G, the height of the second cooling structure 210 is greater than the height of the first cooling structure 110; the bypass structure 320 is a three-way valve, the first valve port of the three-way valve is connected to the first liquid outlet 112, the second valve port of the three-way valve is connected to the second liquid inlet 211, and the third valve port of the three-way valve is connected to the liquid inlet end of the cooling unit 310. During the cooling operation, the cooling unit 310 discharges the coolant from the liquid outlet end, and the coolant is introduced into the first cooling structure 110 through the first liquid inlet 111. After the coolant flows through the first cooling structure 110, it flows out from the first liquid outlet 112 to the three-way valve. At this time, part of the coolant directly flows back to the liquid inlet end of the cooling unit 310 and enters the cooling unit 310, and the other part of the coolant overcomes gravity and flows to the second cooling structure 210 with a higher height. Therefore, the coolant flow rate and hydraulic pressure introduced from the second liquid inlet 211 to the second cooling structure 210 are lower than the coolant flowing through the first cooling structure 110. Therefore, it can meet the different requirements of the first cooling structure 110 and the second cooling structure 210 for the coolant flow rate and hydraulic pressure. That is, without changing the original structure of the battery module 100 and the converter 200, only one set of cooling units 310 is used to meet the cooling requirements of the battery module 100 and the converter 200, effectively reducing the cost of the energy storage system 1000.

[0099] Referring to FIG. 3 , in some embodiments, the hydraulic adjustment mechanism includes a pressure reducing structure 420 . The pressure reducing structure 420 is disposed between the second liquid inlet 211 and the first liquid outlet 112 .

[0100] It is understood that the pressure reducing structure 420 is used to reduce the pressure of the coolant. Specifically, the pressure reducing structure 420 may be, but is not limited to, a pressure reducing valve, a pressure reducing pipeline, etc. The number of pressure reducing structures 420 may be one or more. When there are multiple pressure reducing structures 420, each pressure reducing structure 420 may be sequentially arranged between the second liquid inlet 211 and the first liquid outlet 112.

[0101] For example, in some specific embodiments, the pressure reducing structure 420 is a pressure reducing valve, one of which is disposed in the pipeline between the second liquid inlet 211 and the first liquid outlet 112. For details, see FIG3 . It is understood that the pressure reducing valve reduces hydraulic pressure by creating local resistance to water flow in the flow channel within the valve. The range of the hydraulic pressure reduction is automatically adjusted by the pressure difference between the inlet and outlet water on both sides of the diaphragm or piston connecting the valve disc. The coolant flows through the first cooling structure 110 and is discharged from the first liquid outlet 112 to the pressure reducing valve, which can regulate the pressure of the coolant; the coolant flows to the bypass structure 320, and is bypassed and diverted by the bypass structure 320 and then flows to the pressure reducing valve, and is introduced into the second liquid inlet 211 after pressure reduction regulation by the pressure reducing valve, so that the coolant can be introduced into the second cooling structure 210 after diversion and pressure reduction. The hydraulic pressure of the coolant flowing through the second cooling structure 210 is less than the hydraulic pressure of the coolant flowing through the first cooling structure 110, and the flow rate of the coolant flowing through the second cooling structure 210 is less than the flow rate of the coolant flowing through the first cooling structure 110, so as to meet the purpose of different flow rates and different hydraulic pressures required by the first cooling structure 110 and the second cooling structure 210.

[0102] Referring to FIG. 3 , in some embodiments, the hydraulic adjustment mechanism includes a pressurizing structure 430 , which is disposed between the liquid outlet of the cooling unit 310 and the first liquid inlet 111 .

[0103] As can be understood, the pressurizing structure 430 is used to pressurize the coolant. Specifically, the pressurizing structure 430 may be, but is not limited to, a pressurizing valve, a pressurizing pump, a pressurizing pipeline, etc. The pressurizing pipeline may have a structure with a decreasing cross-sectional area. As the coolant flows, the smaller the cross-sectional area, the greater the hydraulic pressure of the coolant.

[0104] The number of the boosting structural components 430 may be one or more. When the number of the boosting structural components 430 is more than one, each boosting structural component 430 may be sequentially arranged between the liquid outlet of the cooling unit 310 and the first liquid inlet 111 .

[0105] For example, in some specific embodiments, the hydraulic adjustment mechanism includes a pressurizing structure 430 and a pressure reducing structure 420. The pressurizing structure 430 can be a pressurizing pump, and the pressure reducing structure 420 can be a pressure reducing valve. There is one pressurizing pump and one pressure reducing valve. The pressurizing pump is disposed in the pipeline between the cooling unit 310 and the first liquid inlet 111, and the pressure reducing valve is disposed in the pipeline between the first liquid outlet 112 and the second liquid inlet 211, as shown in FIG3 . It can be understood that the pressurizing pump achieves this by rapidly rotating its impeller, driving the coolant to rotate, causing the coolant to gain energy and flow out of the impeller, thereby achieving the purpose of pressurization. The cooling unit 310 discharges the coolant from the liquid outlet end, and the coolant is pressurized by the booster pump and introduced into the first cooling structure 110 from the first liquid inlet 111. After flowing through the first cooling structure 110, the coolant is discharged from the first liquid outlet 112. The discharged coolant is bypassed through the bypass structure 320, and the coolant with reduced flow is then reduced in pressure by the pressure reducing valve and introduced into the second cooling structure 210 from the second liquid inlet 211; therefore, the hydraulic pressure of the coolant flowing through the second cooling structure 210 is less than the hydraulic pressure of the coolant flowing through the first cooling structure 110, and the flow rate of the coolant flowing through the second cooling structure 210 is less than the flow rate of the coolant flowing through the first cooling structure 110, so as to meet the purpose of different flow rates and different hydraulic pressures required by the first cooling structure 110 and the second cooling structure 210.

[0106] Referring to FIG. 2 , in some embodiments, the hydraulic adjustment mechanism includes a pressure-boosting structure 430 . The pressure-boosting structure 430 is disposed between the second liquid inlet 211 and the first liquid outlet 112 .

[0107] For example, in some specific embodiments, the boosting structure 430 can be a boosting pump, and there is one boosting pump, which is disposed in the pipeline between the second liquid inlet 211 and the first liquid outlet 112, as shown in FIG2 . The coolant flows through the first cooling structure 110 and is discharged from the first liquid outlet 112 to the bypass structure 320. The bypass structure 320 bypasses and diverts the coolant before it is introduced into the boosting pump. The boosting pump can regulate the coolant pressure. After the boosting pump pressure regulation, the coolant flows to the second liquid inlet 211. Thus, the coolant can be diverted by the bypass structure 320 and pressurized by the boosting pump before it is introduced into the second cooling structure 210. The hydraulic pressure of the coolant flowing through the second cooling structure 210 is greater than the hydraulic pressure of the coolant flowing through the first cooling structure 110, and the flow rate of the coolant flowing through the second cooling structure 210 is less than the flow rate of the coolant flowing through the first cooling structure 110, thereby meeting the different flow rates and hydraulic pressures required by the first cooling structure 110 and the second cooling structure 210.

[0108] Referring to FIG. 2 , in some embodiments, the hydraulic adjustment mechanism includes a pressure reducing structure 420 . The pressure reducing structure 420 is disposed between the liquid outlet of the cooling unit 310 and the first liquid inlet 111 .

[0109] For example, in some specific embodiments, the hydraulic adjustment mechanism includes a boosting structure 430 and a pressure reducing structure 420, the boosting structure 430 can be a boosting pump, and the pressure reducing structure 420 can be a pressure reducing valve, and the number of the boosting pump and the pressure reducing valve are both one; the boosting pump is arranged on the pipeline between the first liquid outlet 112 and the second liquid inlet 211, and the pressure reducing valve is arranged on the pipeline between the cooling unit 310 and the first liquid inlet 111, and the details can be referred to as shown in Figure 3. The cooling unit 310 outputs the coolant from the liquid outlet end, and the coolant is introduced into the first cooling structure 110 from the first liquid inlet 111 after being reduced in pressure by the pressure reducing valve. The coolant flows through the first cooling structure 110 and is discharged from the first liquid outlet 112. The discharged coolant flows to the bypass structure 320, and is bypassed by the bypass structure 320 and then introduced into the booster pump. The booster pump can regulate the pressure of the coolant. The coolant flows to the second liquid inlet 211 after pressure regulation by the booster pump; therefore, the hydraulic pressure of the coolant flowing through the second cooling structure 210 is greater than the hydraulic pressure of the coolant flowing through the first cooling structure 110, and the flow rate of the coolant flowing through the second cooling structure 210 is less than the flow rate of the coolant flowing through the first cooling structure 110, so as to meet the purpose of different flow rates and different hydraulic pressures required by the first cooling structure 110 and the second cooling structure 210.

[0110] At the same time, it should be understood that a group of battery modules 100 and a corresponding group of converters 200 can constitute an energy storage subsystem, and the energy storage unit can include one or more energy storage subsystems, as shown in Figure 6. It is understood that each energy storage subsystem can be connected to the cooling unit 310 in parallel, that is, the cooling unit 310 can simultaneously provide coolant to multiple energy storage subsystems through the liquid outlet, and after the coolant is diverted to the multiple energy storage subsystems, it can all flow back to the liquid inlet of the cooling unit 310.

[0111] In addition, each energy storage subsystem includes a bypass structure 320, which is used to bypass the coolant flowing through the first cooling structure 110 of the battery module 100, so that the flow rate of the coolant flowing through the second cooling structure 210 of the corresponding inverter 200 is less than the flow rate of the coolant flowing through the first cooling structure 110.

[0112] In a second aspect, an embodiment of the present application further provides an energy storage power station, which includes at least the energy storage system 1000 as described above.

[0113] The energy storage power station provided in an embodiment of the present application includes the above-mentioned energy storage system 1000. Since the energy storage system 1000 can use a set of cooling devices 300 to introduce coolant to the first cooling structure 110 of the battery module 100 and the second cooling structure 210 of the converter 200 to achieve cooling purposes, the cost of the energy storage system 1000 can be effectively reduced, and therefore the cost of the energy storage power station can also be reduced.

[0114] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An energy storage system, characterized in that: include: A battery module, the battery module comprising a first cooling structure, the first cooling structure having a first liquid inlet and a first liquid outlet; A converter, the converter comprising a second cooling structure, the second cooling structure having a second liquid inlet and a second liquid outlet; as well as A cooling device, comprising a cooling unit and a bypass structure; the liquid outlet of the cooling unit is connected to the first liquid inlet through a pipeline, and the liquid inlet of the cooling unit is connected to the second liquid outlet through a pipeline; the bypass structure is configured to be connected to the first liquid outlet and the second liquid inlet, and the bypass structure is also configured to bypass part of the coolant discharged from the first liquid outlet to the outside of the second liquid inlet.

2. The energy storage system according to claim 1, characterized in that: The bypass structure has a bypass end, and the bypass end is connected to the liquid inlet end of the cooling unit.

3. The energy storage system according to claim 2, characterized in that: The bypass structure is a three-way valve, which includes a first valve port, a second valve port and a third valve port. The first valve port is connected to the first liquid outlet, the second valve port is connected to the second liquid inlet, the third valve port is the bypass end, and the third valve port is connected to the liquid inlet end of the cooling unit.

4. The energy storage system according to any one of claims 1 to 3, characterized in that: The cooling device further includes a hydraulic pressure adjustment mechanism configured to be able to adjust a hydraulic pressure difference between the coolant in the first cooling structure and the coolant in the second cooling structure.

5. The energy storage system according to claim 4, characterized in that: The hydraulic adjustment mechanism includes a cushion block; In the gravity direction, when the pad is configured to be disposed at the bottom of the first cooling structure, the height of the first cooling structure is greater than the height of the second cooling structure; Alternatively, in the gravity direction, when the cushion block is configured to be disposed at the bottom of the second cooling structure, the height of the second cooling structure is greater than the height of the first cooling structure.

6. The energy storage system according to claim 5, characterized in that: The spacer has insulating properties.

7. The energy storage system according to claim 4, characterized in that: The hydraulic adjustment mechanism includes a pressure reducing structure, and the pressure reducing structure is arranged between the second liquid inlet and the first liquid outlet.

8. The energy storage system according to claim 4 or 7, characterized in that: The hydraulic adjustment mechanism includes a pressure-boosting structure, and the pressure-boosting structure is arranged between the liquid outlet of the cooling unit and the first liquid inlet.

9. The energy storage system according to claim 4, characterized in that: The hydraulic adjustment mechanism includes a pressure-boosting structure, and the pressure-boosting structure is arranged between the second liquid inlet and the first liquid outlet.

10. The energy storage system according to claim 4 or 9, characterized in that: The hydraulic adjustment mechanism includes a pressure reducing structure, and the pressure reducing structure is arranged between the liquid outlet of the cooling unit and the first liquid inlet.

11. An energy storage power station, characterized in that: The energy storage power station comprises at least the energy storage system according to any one of claims 1-10.

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