Cooling system, energy storage system and energy storage power station

Abstract

The invention relates to the technical field of energy storage cooling, and provides a cooling system, an energy storage system and an energy storage power station, the cooling system comprises a sealing structure, a liquid cooling unit, a cooling structure and a transmission pipeline, the cooling structure is arranged in the sealing structure, and the transmission pipeline comprises a first pipe body and a second pipe body; the first pipe body is connected with the liquid cooling unit and the cooling structure to form a cooling loop; the second pipe body sleeves the part, located outside the sealing structure, of the first pipe body, and the second pipe body is connected to the sealing structure; according to the cooling system provided by the embodiment of the invention, the first pipe body is sleeved with the second pipe body, and the first pipe body is connected with the cooling structure in the sealing structure, so that the first pipe body is separated from air, the probability that the first pipe body forms condensation is low, and meanwhile, due to the fact that the second pipe body does not make contact with the first pipe body and the cooling liquid in the first pipe body, the cooling effect is good. The influence of the cooling liquid on the second pipe body is relatively low, and the second pipe body is approximately at normal temperature, so that condensation is not easy to form on the surface of the second pipe body.

Description

Technical Field

[0001] The present application relates to the field of energy storage cooling technology, and in particular provides a cooling system, an energy storage system and an energy storage power station. Background Art

[0002] With the development of power systems and power electronics technology, energy storage power stations have increasingly higher requirements for energy storage capacity and reliability.

[0003] During operation, the energy storage unit in the energy storage power station generates heat, and a cooling system needs to be designed to introduce coolant through pipes and flow through the cold plate set on the energy storage unit to achieve heat exchange and heat dissipation. However, due to the low temperature of the coolant, condensation is likely to occur on the outer surface of the pipes, cold plates, and electronic devices during long-term operation, resulting in insulation failure, thus posing a major hidden danger to the energy storage power station. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a cooling system, an energy storage system and an energy storage power station, aiming to solve the problem that the structure used to transport coolant in the related technology is prone to condensation and poses a hidden danger to the live structure.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is:

[0006] In a first aspect, an embodiment of the present application provides a cooling system, including a sealing structure, a liquid cooling unit, a cooling structure and a transmission pipeline, wherein the liquid cooling unit is used to provide cooling liquid, the cooling structure is arranged in the sealing structure, and the transmission pipeline includes a first tube body and a second tube body, the first tube body connects the liquid cooling unit and the cooling structure to form a cooling circuit; the second tube body is sleeved on the part of the first tube body located outside the sealing structure, and the second tube body is connected to the sealing structure.

[0007] Beneficial effects of the embodiments of the present application: In the energy storage system provided by the embodiments of the present application, the liquid cooling unit can pass the cooling liquid into the cooling structure through the first tube body, so that the cooling liquid can flow in the cooling circuit for heat exchange; the first tube body extends into the interior of the sealing structure to connect the cooling structure, and at the same time, the part of the first tube body located outside the sealing structure is sleeved in the second tube body, that is, the first tube body is protected by the sleeve of the second tube body, and the cooling structure is arranged in the sealing structure, so the connection between the first tube body and the cooling structure is also located inside the sealing structure, thereby, the first tube body is not in direct contact with the air, and the probability of condensation on the first tube body can be reduced by controlling the humidity inside the second tube body and the sealing structure; and the second tube body is not in direct contact with the cooling liquid, and the temperature change of the second tube body is small, so the probability of condensation on the second tube body is also low, thereby effectively reducing the hidden dangers caused by condensation to the charged structure.

[0008] In some embodiments, the first tube body includes at least one of an insulating tube body and a metal tube body; and / or the second tube body includes at least one of an insulating tube body and a metal tube body.

[0009] By adopting the above-mentioned technical solution, the first tube body may include an insulating tube body and / or a metal tube body. When the insulating tube body is used, the insulating tube body can play an insulating effect. When the metal tube body is used, the cost of the metal tube body is lower, which can reduce the cost of the cooling system. Similarly, the second tube body may also include an insulating tube body and / or a metal tube body. When the insulating tube body is used, the insulating tube body can play an insulating effect. When the metal tube body is used, the cost of the metal tube body is lower, which can reduce the cost of the cooling system.

[0010] In some embodiments, the number of cooling structures is two or more, and liquid paths are formed in parallel between the cooling structures.

[0011] By adopting the above-mentioned technical solution, two or more cooling structures can be used to simultaneously cool multiple objects that need to be cooled, and coolant can be introduced between each cooling structure at the same time. The cooling effects between the cooling structures will not affect each other, thereby effectively improving the cooling efficiency.

[0012] In some embodiments, the cooling system includes a gas generating device for providing a protective gas, and the second pipe body is connected to the gas generating device and the sealing structure to form a loop.

[0013] By adopting the above-mentioned technical solution, a gas generating device can be used to continuously introduce protective gas into the second tube body so that the protective gas can replace the air and contact the first tube body and the cooling structure, thereby effectively improving the problem of condensation forming on the first tube body and the cooling structure.

[0014] In some embodiments, the number of the sealing structures is two or more, and gas paths are connected in parallel between the sealing structures.

[0015] By adopting the above-mentioned technical solution, two or more sealing structures can be used to accommodate multiple objects to be cooled, so that multiple objects can be cooled at the same time; and the gas generating device can introduce protective gas to multiple sealing structures at the same time through the second tube body, and perform anti-condensation treatment during the cooling process.

[0016] In some embodiments, the inner diameter of the second tube body can be determined by the inner diameter of the first tube body and influencing factors, wherein the influencing factors include the length of the second tube body, the type of shielding gas, the temperature of the shielding gas, the flow rate of the shielding gas, and the flow rate and temperature of the coolant.

[0017] By adopting the above technical solution, the inner diameter of the second tube body can be calculated by the above influencing factors and the inner diameter of the first tube body, so as to further improve the anti-condensation effect after the second tube body is sleeved on the first tube body and the protective gas is introduced.

[0018] In some embodiments, the inner diameter of the first tube is D1, the inner diameter of the second tube is D2,

[0019]

[0020] Wherein, x is the first empirical coefficient, y is the second empirical coefficient, z is the third empirical coefficient, L is the characteristic length of the annular section of the second tube, C is the specific heat capacity of the shielding gas, Q1 is the flow rate of the coolant, t1 is the temperature of the coolant, t2 is the temperature of the shielding gas, t dew is the dew point temperature, μ is the dynamic viscosity of the shielding gas, V2 is the flow rate of the shielding gas, ρ2 is the density of the shielding gas, λ is the thermal conductivity of the shielding gas, l is the length of the second tube, and Pr is the Prandtl number of the shielding gas.

[0021] By adopting the above technical solution, the relationship between the inner diameter of the first tube body and the inner diameter of the second tube body can be determined by the above formula to improve the anti-condensation effect.

[0022] In a second aspect, an embodiment of the present application provides an energy storage system, including an energy storage unit and a cooling system as described above, wherein the energy storage unit is disposed in the sealing structure, and the cooling structure is disposed on the energy storage unit.

[0023] Beneficial effects of the embodiments of the present application: The energy storage system provided by the embodiments of the present application includes the above-mentioned cooling system. When the probability of condensation in the above-mentioned cooling system is low, the operation of the energy storage system is more stable.

[0024] In some embodiments, the energy storage system includes a gas unit for providing fire-fighting gas, and the second pipe body connects the gas unit and the sealing structure to form a loop.

[0025] By adopting the above-mentioned technical solution, the gas unit contained in the energy storage system itself can be used to continuously introduce fire-fighting gas into the circuit, so that the fire-fighting gas can replace the air and come into contact with the first tube body and the cooling structure, thereby effectively improving the problem of condensation forming on the first tube body and the cooling structure.

[0026] In some embodiments, the energy storage unit includes a battery module, and the battery module is disposed in at least one sealed structure.

[0027] By adopting the above technical solution, the battery modules can be arranged in one or more sealed housings, so that multiple battery modules can be divided into multiple sealed housings for heat dissipation respectively, which effectively improves the heat dissipation efficiency of the battery modules.

[0028] In some embodiments, the energy storage unit includes a power module, and the power module is disposed in at least one sealed structure.

[0029] By adopting the above technical solution, a power module can be arranged in one or more sealed housings. Therefore, when there are multiple power modules, the multiple power modules can be divided into multiple sealed housings for heat dissipation respectively, which effectively improves the heat dissipation efficiency of the power modules.

[0030] In some embodiments, the energy storage system further includes an exhaust structure, and the exhaust structure is disposed at any location between the sealing structure and the gas inlet end of the gas unit.

[0031] By adopting the above-mentioned technical solution, in the event of thermal runaway of the energy storage unit, firefighting gas carrying flammable smoke, harmful gases, etc. generated by thermal runaway can be discharged to the outside through the exhaust structure, thereby reducing the impact on the gas unit.

[0032] In some embodiments, an on-off structure is provided on the exhaust structure.

[0033] By adopting the above technical solution, the on-off structure can be controlled so that when thermal runaway occurs, the on-off structure opens and the exhaust structure is turned on, thereby being able to promptly discharge combustible smoke, harmful gases, etc. generated by the thermal runaway.

[0034] In some embodiments, the energy storage system includes an equipotential region and a non-equipotential region, the second pipe body includes an insulating pipe segment and a metal pipe segment, the insulating pipe segment is arranged in the non-equipotential region, and the metal pipe segment is arranged in the equipotential region.

[0035] By adopting the above technical solution, in the non-equipotential area, the second tube body adopts an insulating tube section to improve the insulation protection effect; at the same time, in the equipotential area, the second tube body adopts a metal tube section, and the cost of the metal tube section is lower, thereby reducing the overall cost of the energy storage system.

[0036] In a third aspect, an embodiment of the present application further provides an energy storage power station, comprising the energy storage system as described above.

[0037] 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. On the basis that the probability of condensation in the energy storage system is low, the probability of condensation in the energy storage power station is also low, and the operation of the energy storage power station is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. 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 paying creative work.

[0039] Figure 1 A schematic diagram of the structure of a cooling system provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of another cooling system provided in an embodiment of the present application;

[0041] Figure 3 A cross-sectional view of a transmission pipeline provided in an embodiment of the present application;

[0042] Figure 4 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the structure of another energy storage system provided in an embodiment of the present application.

[0044] Among them, the reference numerals in the figure are:

[0045] 1000. Energy storage system;

[0046] 100. cooling system; 110. liquid cooling unit; 120. cooling structure;

[0047] 130. Transmission pipeline; 131. First pipe body; 1311. Cooling circuit; 132. Second pipe body;

[0048] 140. Gas generating device;

[0049] 200. Sealing structure;

[0050] 300, energy storage unit; 310, battery module; 320, power module;

[0051] 400, gas unit; 500, exhaust structure; 600, on-off structure. DETAILED DESCRIPTION

[0052] Embodiments of the present application are described in detail below, and examples of the embodiments 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.

[0053] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present application.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, 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 specific circumstances.

[0056] Energy storage is an important equipment foundation and key supporting technology for building a new power system and promoting the green and low-carbon transformation of energy. With the development of power systems and power electronics technology, energy storage power stations have higher and higher requirements for energy storage capacity and reliability.

[0057] The energy storage system includes an energy storage unit and a cooling system. During operation, the energy storage unit will generate heat, so a cooling system is required to dissipate heat and cool the energy storage unit. In the related art, the cooling system mainly uses pipelines to circulate the coolant into the cold plate and other structures provided on the energy storage unit, and uses the coolant to perform heat exchange and heat dissipation on the energy storage unit. However, due to the low temperature of the coolant, when the coolant flows through the pipeline and cold plate and other structures, the temperature of the pipeline and cold plate will also be relatively low. Since the pipeline, cold plate and other structures are lower than normal temperature, condensation is easily generated on their surfaces in contact with the air, resulting in condensation on the surfaces of the pipeline, cold plate, electronic devices and other structures; and the energy storage unit is a charged body, and the generation of condensation will pose a greater hidden danger to the energy storage unit and the energy storage system.

[0058] Based on the above considerations, in order to solve the problem that the structure used for conveying coolant in the related technology is prone to condensation and poses a hidden danger to the charged structure (such as the energy storage unit in the energy storage system and other components), a cooling system is designed, in which the first tube body of the transmission pipeline is extended into the sealing structure to connect the cooling structure, and then the second tube body is sleeved on the part of the first tube body located outside the sealing structure, so that the first tube body with a lower temperature is protected by the second tube body and the sealing structure to isolate the air. Therefore, the first tube body is located in an environment with lower humidity than the air, and the probability of condensation on the first tube body is lower; at the same time, since the second tube body is not in direct contact with the coolant, the temperature change of the second tube body is small, and therefore the probability of condensation on the second tube body is lower. Thus, the problem of condensation in the cooling system during the process of conveying coolant can be effectively improved.

[0059] The cooling system disclosed in the embodiments of the present application can be used, but is not limited to, in energy storage systems, power distribution systems, or other equipment including live structures.

[0060] For the sake of convenience, the following detailed description is given by taking the cooling system applied to the energy storage system as an example.

[0061] The energy storage system can be used in, but is not limited to, fixed or mobile energy stations, such as energy storage containers, energy storage distribution cabinets, energy storage power stations, battery swap stations, etc. In some embodiments, the energy storage system may also include other functional compartments, such as a control compartment, a fire compartment, etc. The control compartment is used to manage the battery to achieve storage and output of electrical energy.

[0062] Next, the cooling system provided in the embodiment of the present application will be introduced and explained.

[0063] Please refer to Figures 1 to 3 The embodiment of the present application provides a cooling system 100, including a sealing structure 200, a liquid cooling unit 110, a cooling structure 120 and a transmission pipeline 130, wherein the liquid cooling unit 110 is used to provide cooling liquid, the cooling structure 120 is arranged in the sealing structure 200, and the transmission pipeline 130 includes a first tube body 131 and a second tube body 132, the first tube body 131 connects the liquid cooling unit 110 and the cooling structure 120 to form a cooling circuit 1311; the second tube body 132 is sleeved on the part of the first tube body 131 located outside the sealing structure 200, and the second tube body 132 is connected to the sealing structure 200.

[0064] It can be understood that the cooling system 100 can be applied to, but not limited to, energy storage systems, power distribution systems, or other equipment containing live structures. The sealing structure 200 refers to a structure having a sealed inner cavity. Optionally, the sealing structure 200 can be, but not limited to, a sealed housing, a sealed cover, a sealed box, a sealed barrel, a sealed cabinet, a sealed cabin, etc.; for example, when the cooling system 100 is applied to an energy storage device, the sealing structure 200 of the energy storage device may include a battery cabinet sealed housing for accommodating a battery module, or a power cabinet sealed housing for accommodating a power module, etc.

[0065] The cooling structure 120 is arranged in the sealing structure 200, and a coolant can flow through the interior of the cooling structure 120, and the coolant absorbs the heat in the sealing structure 200 to achieve the purpose of cooling; at the same time, the sealing structure 200 can also separate the cooling structure 120 from the external air, so that the humidity inside the sealing structure 200 can be reduced by vacuuming, filling with dry gas or other protective gas, thereby reducing the probability of condensation in the cooling structure 120.

[0066] The cooling structure 120 includes but is not limited to cold plates, cooling pipes and other structural parts that can allow the coolant to flow.

[0067] The transmission pipeline 130 includes a first tube body 131 and a second tube body 132. Optionally, the material of the first tube body 131 and the second tube body 132 can be selected as an insulating material (for example, polyvinylidene fluoride material, polypropylene material, etc.) or a metal material (for example, a stainless steel tube, an aluminum tube, a copper tube, an alloy tube, etc.). For example, in some specific embodiments, the first tube body 131 and the second tube body 132 can be formed by a combination of an insulating tube body and a metal tube body. For example, in an equipotential area, the first tube body 131 and the second tube body 132 are metal tube bodies, and in a non-equipotential area, the first tube body 131 and the second tube body 132 are insulating tube bodies.

[0068] The first tube body 131 connects the liquid cooling unit 110 and the cooling structure 120 to form a cooling circuit 1311, wherein the liquid cooling unit 110 is used to provide a coolant so that the coolant can flow in the cooling circuit 1311 to achieve the cooling purpose; the liquid cooling unit 110 is also used to cool the cooling refluxed coolant again. The above-mentioned coolant can be, but is not limited to, cooling water, cooling oil, etc.

[0069] The first tube body 131 is connected to the cooling structure 120. Specifically, the first tube body 131 extends into the interior of the sealing structure 200 and is connected to the cooling structure 120 inside the sealing structure 200. Thus, the connection between the first tube body 131 and the cooling structure 120 is located inside the sealing structure 200. The connection between the first tube body 131 and the cooling structure 120 can also be protected by the cover of the sealing structure 200 and separated from the external air. Therefore, the connection between the first tube body 131 and the cooling structure 120 and the probability of condensation forming on the cooling structure 120 can be effectively reduced.

[0070] The second tube body 132 is sleeved on the portion of the first tube body 131 located outside the sealing structure 200. Thus, the portion of the first tube body 131 located outside the sealing structure 200 can be covered and protected by the second tube body 132 and separated from the external air. Therefore, the probability of condensation forming on the portion of the first tube body 131 located outside the sealing structure 200 can also be effectively reduced.

[0071] It should be understood that the coolant is located inside the first tube body 131, and the second tube body 132 is sleeved on the first tube body 131, and there is no contact between the second tube body 132 and the first tube body 131. Therefore, the temperature change of the second tube body 132 is less affected by the first tube body 131 and the coolant inside the first tube body 131, that is, the second tube body 132 can still maintain a roughly normal temperature state, so the probability of condensation forming on the second tube body 132 is low.

[0072] In the energy storage system provided in the embodiment of the present application, the liquid cooling unit 110 can pass the cooling liquid into the cooling structure 120 through the first tube body 131, so that the cooling liquid can flow in the cooling circuit 1311 for heat exchange; the first tube body 131 extends into the interior of the sealing structure 200 to connect the cooling structure 120, and at the same time, the part of the first tube body 131 located outside the sealing structure 200 is sleeved in the second tube body 132, that is, the first tube body 131 is sleeved and protected by the second tube body 132, and the cooling structure 120 is arranged in the sealing structure 200, so the first tube body 13 The connection between the first tube body 131 and the cooling structure 120 is also located inside the sealing structure 200, so that neither the first tube body 131 nor the cooling structure 120 is in direct contact with the outside air; the probability of condensation on the first tube body 131 and the cooling structure 120 can be reduced by controlling the humidity inside the second tube body 132 and the sealing structure 200; and the second tube body 132 is not in direct contact with the coolant, and the temperature change of the second tube body 132 is small, so the probability of condensation on the second tube body 132 is also low, thereby effectively reducing the hidden dangers caused by condensation to the charged structure.

[0073] Optionally, in some embodiments, the second tube body 132 and the sealing structure 200 can be vacuumed to reduce the humidity of the internal environment of the second tube body 132 and the sealing structure 200, thereby effectively reducing the probability of condensation on the first tube body 131 and the cooling structure 120; or, dry gas can be introduced into the second tube body 132 and the sealing structure 200 to reduce the humidity of the internal environment of the second tube body 132 and the sealing structure 200, thereby effectively reducing the probability of condensation on the first tube body 131 and the cooling structure 120.

[0074] Please refer to Figures 1 to 3 In some embodiments, the first tube body 131 includes at least one of an insulating tube body and a metal tube body; and / or the second tube body 132 includes at least one of an insulating tube body and a metal tube body.

[0075] It can be understood that the first tube body 131 can only include an insulating tube body, which has insulating properties, so the insulating tube body is safer when used in live equipment; or, the first tube body 131 can only include a metal tube body, which has a lower cost, so the use of a metal tube body can effectively reduce the cost of the cooling system 100; or, the first tube body 131 can include both an insulating tube body and a metal tube body, so that the insulating tube body can be used in the live area of ​​the live equipment, and the metal tube body can be used in the non-live area, thereby reducing the risks of short circuit, electric shock, etc., and improving the cost of the cooling system 100.

[0076] Similarly, the second tube body 132 may include only an insulating tube body; or, the second tube body 132 may include only a metal tube body; or, the second tube body 132 may include both an insulating tube body and a metal tube body.

[0077] Please refer to Figures 1 to 3 In some embodiments, the number of cooling structures 120 is two or more, and liquid paths are formed in parallel between the cooling structures 120 .

[0078] It should be understood that the parallel liquid circuits formed between the cooling structures 120 mean that the cooling liquid provided by the liquid cooling unit 110 can be simultaneously introduced into each cooling structure 120 through the first tube body 131, and the cooling liquid discharged from each cooling structure 120 can converge into the first tube body 131 and flow back into the liquid cooling unit 110 to form a cooling circuit 1311.

[0079] Optionally, the specific method of forming the liquid circuits in parallel between the cooling structures 120 can be: the first tube body 131 includes a first main pipe part and a plurality of first branch pipe parts connected to the first main pipe part, the first main pipe part is connected to the liquid cooling unit 110, and the first branch pipe parts are respectively connected to the corresponding cooling structures 120, so as to achieve the purpose of connecting the liquid circuits of the cooling structures 120 in parallel.

[0080] For example, in some embodiments, when the cooling system 100 is applied to the energy storage system 1000, multiple cooling structures 120 can be respectively arranged on multiple battery modules 310 of the energy storage system 1000, and the first tube body 131 is used to simultaneously introduce coolant into the multiple cooling structures 120, thereby achieving simultaneous heat dissipation of each battery module 310.

[0081] With such an arrangement, two or more cooling structures 120 can be used to cool multiple objects to be cooled simultaneously, and coolant can be introduced between the cooling structures 120 at the same time, which effectively improves the uneven cooling effect and improves the cooling efficiency.

[0082] Please refer to Figures 1 to 3 In some embodiments, the cooling system 100 includes a gas generating device 140 for providing a protective gas, and the second pipe body 132 is connected to the gas generating device 140 and the sealing structure 200 to form a loop.

[0083] The gas generating device 140 is used to supply protective gas, and the gas generating device 140 can continuously introduce protective gas into the second tube body 132 and the sealing structure 200 so that the inside of the gas generating device 140 and the sealing structure 200 are kept filled with protective gas.

[0084] The protective gas may be nitrogen, carbon dioxide, or an inert gas, etc. The second tube 132 and the sealing structure 200 are filled with the protective gas. Compared with air, the humidity of the protective gas is low or even dry gas without moisture. Therefore, the probability of condensation in the first tube 131 in an environment filled with protective gas is effectively reduced.

[0085] With such an arrangement, the gas generating device 140 can be used to continuously introduce protective gas into the second tube body 132 and the sealing structure 200 to reduce the humidity of the internal environment of the second tube body 132 and the sealing structure 200, thereby effectively improving the problem of condensation forming on the first tube body 131 and the cooling structure 120.

[0086] Please refer to Figures 1 to 3 In some embodiments, the number of the sealing structures 200 is two or more, and gas paths are formed in parallel between the sealing structures 200 .

[0087] It should be understood that the gas circuits formed in parallel between the sealing structures 200 mean that the protective gas provided by the gas generating device 140 can be simultaneously introduced into each sealing structure 200 through the second tube body 132, and the protective gas exported from each sealing structure 200 can converge into the second tube body 132 and flow back into the gas generating device 140 to form a loop.

[0088] Optionally, the specific method of forming the gas circuits in parallel between the sealing structures 200 can be: the second tube body 132 includes a second main pipe part and a plurality of second branch pipe parts connected to the second main pipe part, the second main pipe part is connected to the gas generating device 140, and the second branch pipe parts are respectively connected to the corresponding sealing structures 200, so as to achieve the purpose of connecting the liquid circuits of the sealing structures 200 in parallel.

[0089] For example, in some embodiments, when the cooling system 100 is applied to the energy storage system 1000, the multiple sealing structures 200 can respectively accommodate objects to be cooled, such as heating devices such as battery modules 310 or power modules 320. At this time, the sealing structure 200 can be a sealed housing or a sealed electrical cabinet, etc.; a cooling structure 120 is set on the battery module 310 or the power module 320 in each sealing structure 200 for cooling, and a liquid circuit is formed in parallel between the cooling structures 120 to ensure the cooling efficiency of the cooling structure 120; at the same time, a gas circuit is formed in parallel between the sealing structures 200, and the protective gas can be introduced into each sealing structure 200 through the second tube body 132 at the same time. When any one or more battery modules 310 or power modules 320 have thermal runaway, the probability of combustible smoke generated by thermal runaway entering other sealing structures 200 is low, so the probability of thermal runaway spreading is low, that is, the gas circuit parallel setting of the sealing structure 200 can effectively reduce the occurrence of thermal runaway spreading.

[0090] Please refer to Figures 1 to 3 In some embodiments, the inner diameter of the second tube body 132 can be determined by the inner diameter of the first tube body 131 and the influencing factors, wherein the influencing factors include the length of the second tube body 132, the type of protective gas, the temperature of the protective gas, the flow rate of the protective gas, and the flow rate and temperature of the coolant.

[0091] It is understandable that in order to improve the anti-condensation effect of the first tube body 131 and reduce the probability of condensation in the second tube body 132, it is necessary to obtain the relationship between the inner diameter of the second tube body 132 and the inner diameter of the first tube body, so as to obtain the required inner diameter of the second tube body 132.

[0092] The above-mentioned influencing factors refer to factors that affect the inner diameter of the second tube body 132. The inner diameter of the second tube body 132 is related to the length of the second tube body 132, the type of shielding gas, the temperature of shielding gas, the flow rate of shielding gas, and the flow rate and temperature of coolant.

[0093] The type of shielding gas will affect the shielding gas's specific heat capacity, density, thermal conductivity, dynamic viscosity, Prandtl number and other parameters; therefore, different types of shielding gas will also affect the selection of the inner diameter of the second tube 132 .

[0094] Please refer to Figures 1 to 3 In some embodiments, the inner diameter of the first tube 131 is D1, and the inner diameter of the second tube 132 is D2.

[0095]

[0096] Wherein, x is the first empirical coefficient, y is the second empirical coefficient, z is the third empirical coefficient, L is the characteristic length of the annular cross section of the second tube body 132, C is the specific heat capacity of the protective gas, Q1 is the flow rate of the coolant, t1 is the temperature of the coolant, t2 is the temperature of the protective gas, t dew is the dew point temperature, μ is the dynamic viscosity of the protective gas, V2 is the flow rate of the protective gas, ρ2 is the density of the protective gas, λ is the thermal conductivity of the protective gas, l is the length of the second tube 132, and Pr is the Prandtl number of the protective gas.

[0097] It can be understood that the first empirical coefficient x, the second empirical coefficient y and the third empirical coefficient z are specific numbers selected based on experience; therefore, according to different requirements, x, y, z can be different numbers.

[0098] Characteristic length belongs to the concept of fractal geometry. In physics, characteristic length is the dimension that defines the scale of a physical system; therefore, the characteristic length L of the annular cross-section of the second tube body 132 may be the diameter of the second tube body 132 .

[0099] Specific heat capacity is the heat capacity of a substance per unit mass, that is, the amount of heat absorbed or released when a unit mass of an object changes unit temperature; the specific heat capacity C of the protective gas is the amount of heat absorbed or released when a unit mass of the protective gas changes unit temperature.

[0100] Dew point temperature refers to the temperature of air when it is cooled to saturation under the condition that the water vapor content and air pressure remain unchanged; therefore, the dew point temperature t dew It refers to the temperature at which condensation will form on the second tube 132 in the current environment; it should be understood that the dew point temperature t dew It can be obtained by checking the current ambient temperature and relative humidity and looking up the psychrometric chart.

[0101] The Prandtl number Pr is a dimensionless scalar in fluid mechanics that reflects the mutual influence of energy and momentum transfer processes in the fluid.

[0102] As can be understood, the equation can be established by the Nusselt number; the Nusselt number is the ratio of the convective heat to the conductive heat across the boundary, and the Nusselt number Nu is defined as:

[0103] At the same time, the relationship between the Nusselt number Nu and the Prandtl number Pr and the Reynolds number Re is:

[0104] Nu=x·Re y ·Pr z ;

[0105] Among them, the Reynolds number Re is a dimensionless number that can be used to characterize the flow of fluids. The Reynolds number Re is defined as:

[0106] The above D is: D = D2-D1.

[0107] Therefore, we can substitute formula ④ into formula ③ to obtain:

[0108] Substituting formula ⑤ into formula ②, we get:

[0109] Combining formula ⑥ with formula ①, we get:

[0110] Then, according to the calculation formula of heat transfer q, the equation can be obtained:

[0111]

[0112] The relationship between h and D2 can be seen from equation ⑦:

[0113]

[0114] Substituting formula 9 into formula 8, we can get the relationship between D1 and D2:

[0115]

[0116] The specific values ​​of D1 and D2 under different environments can be calculated by the above equation to determine the diameters of the first tube body 131 and the second tube body 132 .

[0117] Please refer to Figure 4 In a second aspect, an embodiment of the present application provides an energy storage system 1000 , including an energy storage unit 300 and a cooling system 100 as described above, wherein the energy storage unit 300 is disposed in a sealing structure 200 , and the cooling structure 120 is disposed on the energy storage unit 300 .

[0118] The energy storage unit 300 refers to the smallest unit for storing energy in the energy storage system 1000. For example, the energy storage unit 300 may be a battery cabinet, a battery module, a power module, etc. The number of the energy storage unit 300 may be one or more.

[0119] The cooling system 100 is used to cool the energy storage unit 300 to reduce the risk of the energy storage unit 300 being overheated due to long-term operation.

[0120] The cooling structure 120 is used to be arranged on the energy storage unit 300, and can pass coolant through the first tube body 131 of the transmission pipeline 130, so that the coolant with a lower temperature passes into the cooling structure 120 and exchanges heat with the energy storage unit 300 with a higher temperature, thereby achieving cooling treatment of the energy storage unit 300.

[0121] The energy storage system 1000 provided in the embodiment of the present application includes the above-mentioned cooling system 100, which is used to cool the energy storage system 1000. The probability of condensation in the cooling system 100 during the process of transmitting coolant for cooling is low, so the operation of the energy storage system 1000 is more stable.

[0122] Please refer to Figure 4 and Figure 5 In some embodiments, the energy storage system 1000 includes a gas unit 400 for providing fire-fighting gas, and the second pipe body 132 connects the gas unit 400 and the sealing structure 200 to form a loop.

[0123] It can be understood that the gas unit 400 is a device for dealing with thermal runaway in the energy storage system 1000. The gas unit 400 is used to generate firefighting gas so that in the event of thermal runaway, the firefighting gas can hinder the combustion of the combustible smoke generated by the thermal runaway. Optionally, the firefighting gas includes but is not limited to nitrogen or various inert gases.

[0124] The second tube body 132 connects the gas unit 400 and the sealing structure 200 to form a loop, whereby the fire-fighting gas provided by the gas unit 400 can be passed into the interior of the second tube body 132 and the sealing structure 200, so that the first tube body 131 and the cooling structure 120 will be in an environment filled with fire-fighting gas. Since the humidity of the fire-fighting gas is low, the probability of condensation forming on the first tube body 131 and the cooling structure 120 is low.

[0125] It is understandable that the firefighting gas is introduced into the loop formed by the second tube 132 and the sealing structure 200. Due to the continuous introduction of the firefighting gas by the gas unit 400, the airflow velocity in the sealing structure 200 is increased, that is, the airflow velocity on the surface of the energy storage unit 300 is faster, thereby effectively improving the heat dissipation effect of the energy storage unit 300. It is understandable that the firefighting gas can also effectively deal with the thermal runaway of the energy storage unit 300. In the event of thermal runaway, the firefighting gas can suppress the occurrence of combustion.

[0126] At the same time, since the fire-fighting gas provided by the gas unit 400 is room temperature gas, the fire-fighting gas filling the second tube 132 has little effect on the temperature of the second tube 132, and the second tube 132 is still roughly at room temperature, so the probability of condensation in the second tube 132 is also low.

[0127] With such an arrangement, the gas unit 400 can be used to continuously introduce firefighting gas into the loop formed by the second tube body 132 and the sealing structure 200, so that the firefighting gas can replace the air and come into contact with the first tube body 131 and the cooling structure 120, thereby effectively improving the problem of condensation forming on the first tube body 131 and the cooling structure 120, while having a lower impact on the temperature of the second tube body 132, and a lower probability of condensation forming on the second tube body 132; and, by using the gas unit 400 contained in the energy storage system 1000 itself to provide firefighting gas, condensation can be reduced while also inhibiting thermal runaway.

[0128] Please refer to Figure 4 and Figure 5 In some embodiments, the energy storage unit 300 includes a battery module 310 , and the battery module 310 is disposed in at least one sealing structure 200 .

[0129] The battery module 310 is a module formed by connecting battery cells in series and / or in parallel.

[0130] The cooling structure 120 may be disposed on a battery module 310 formed by connecting a plurality 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 310. When the coolant flows in the cooling structure 120, the battery module 310 is cooled by the cooling structure 120, and the heat generated by the battery module 310 during operation is removed.

[0131] In some implementations of this embodiment, the sealing structure 200 may be a sealed shell structure such as a box or cabinet, and the sealing structure 200 is used to accommodate the battery module 310; optionally, in some implementations, the sealing structure 200 may be a cabinet, and the battery module 310 is disposed in the cabinet to form a battery cabinet.

[0132] Among them, the number of battery modules 310 can be one or more. When the number of battery modules 310 is one, the battery module 310 can be set in any sealing structure 200; when the number of battery modules 310 is two or more, multiple battery modules 310 can be set in one of the sealing structures 200, or, one or more battery modules 310 can be set in multiple sealing structures 200.

[0133] With such an arrangement, a battery module 310 can be arranged in one or more sealing structures 200, so that multiple battery modules 310 can be divided into multiple sealing structures 200 for separate heat dissipation, thereby effectively improving the heat dissipation efficiency of the battery module 310; at the same time, when thermal runaway occurs in the battery module 310 in any one or more sealing structures 200, the impact on other sealing structures 200 that have not experienced thermal runaway is relatively low; and, in the case where multiple sealing structures 200 are connected in parallel, the fire-fighting gas will drive the combustible smoke generated by thermal runaway to be discharged outside the sealing structure 200, and the probability of the exhausted gas entering other parallel sealing structures 200 is relatively low, thereby causing the probability of thermal runaway spreading to be relatively low.

[0134] Please refer to Figure 4 and Figure 5 In some embodiments, the energy storage unit 300 includes a power module 320 , and the power module 320 is disposed in at least one sealing structure 200 .

[0135] The power module 320 is a module used to control and adjust the battery module 310. The specific type of the power module 320 is not unique, and it can be a half-bridge, full-bridge, quasi-full-bridge, and other types of topology structures, which are not specifically limited. The power module 320 may also include a power module 320 controller, a bypass switch, a voltage equalization circuit, and other parts. The power module 320 controller realizes the control and protection of the entire power module 320; the bypass switch is used to quickly bypass the energy storage module when it fails.

[0136] In some implementations of this embodiment, the sealing structure 200 may be a sealed structure such as a shell, a box, a cabinet, etc.

[0137] With such an arrangement, at least one of the multiple sealing structures 200 can be used to accommodate the power module 320, so that the power module 20 and the battery module 310 can be placed in different sealing structures 200, thereby reducing the impact of possible thermal runaway of the battery module 310 on the power module 320; and, when the multiple sealing structures 200 are connected in parallel, the fire-fighting gas will drive the combustible smoke generated by thermal runaway to be discharged outside the sealing structure 200, and the probability of the exhausted gas entering other parallel sealing structures 200 is low, thereby causing the probability of thermal runaway spreading is also low.

[0138] Please refer to Figure 4 and Figure 5 In some embodiments, the energy storage system 1000 further includes an exhaust structure 500 , which is disposed at any location between the sealing structure 200 and the gas inlet end of the gas unit 400 .

[0139] The exhaust structure 500 is used to discharge the gas in the sealing structure 200 to the outside; the exhaust structure 500 can be set on the sealing structure 200, the exhaust structure 500 can also be set on the second tube body 132, or the exhaust structure 500 can be formed between the second tube body 132 and the sealing structure 200.

[0140] Optionally, the exhaust structure 500 can be an exhaust pipe, which can be set on the sealing structure 200 or on the second tube body 132; or, the exhaust structure 500 can also be an exhaust port, which can be opened on the sealing structure 200; or, the exhaust structure 500 can also be a hole structure opened on the second tube body 132.

[0141] With such arrangement, in the event of thermal runaway of the energy storage unit 300, the combustible smoke generated by the energy storage unit 300 during thermal runaway can be discharged outwardly from the exhaust structure 500 along with the fire-fighting gas, thereby reducing the probability of the combustible smoke flowing back to the gas unit 400 in the loop, thereby reducing the impact of the combustible smoke on the gas unit 400.

[0142] Please refer to Figure 4 and Figure 5 In some embodiments, a switch structure 600 is provided on the exhaust structure 500 .

[0143] The above-mentioned on-off structure 600 is used to control the on-off of the exhaust structure 500; optionally, the on-off structure 600 can be but is not limited to a solenoid valve, an electronic valve, a manual valve, a molten part, etc. For example, when the exhaust structure 500 includes an exhaust pipe, the on-off structure 600 can be a valve structure such as a solenoid valve, an electronic valve, a manual valve, etc., and the valve structure is used to control the on-off of the exhaust pipe; or, when the exhaust structure 500 includes an exhaust hole or an exhaust port, the on-off structure 600 can be a molten part, such as paraffin, plastic (polyvinyl chloride, polycarbonate, etc.) and other material layers with a low melting point, and these material layers are sealed on the exhaust hole or the exhaust port. In the event of thermal runaway, the combustible smoke generated by the thermal runaway contacts the molten part and melts through the molten part, so that the exhaust hole or the exhaust port is connected to the outside.

[0144] With such arrangement, the on-off structure 600 can be opened in the event of thermal runaway of the energy storage unit 300, so that the combustible smoke generated by the energy storage unit 300 in thermal runaway can be discharged from the exhaust structure 500 along with the fire-fighting gas, thereby reducing the impact of the combustible smoke on the gas unit 400.

[0145] For example, in some specific embodiments, the energy storage system 1000 includes an energy storage unit 300, a gas unit 400 and a cooling system 100; the cooling system 100 includes a sealing structure 200, a liquid cooling unit 110, a cooling structure 120 and a transmission pipeline 130, the energy storage unit 300 includes a power module 320 and a plurality of battery modules 310, the number of the sealing structures 200 is multiple, and the battery modules 310 and the power modules 320 are respectively arranged in the multiple sealing structures 200. The transmission pipeline 130 includes a first tube body 131 and a second tube body 132, and the first tube body 131 is arranged inside the second tube body 132.

[0146] The specific connection method of the transmission pipeline 130 is: the first tube body 131 extends from the second tube body 132 and is connected to the liquid outlet of the liquid cooling unit 110 for exporting the coolant, and the second tube body 132 is connected to the gas outlet of the gas unit 400 for exporting the fire-fighting gas; at the same time, a plurality of second branch sections are arranged on the second tube body 132, and each second branch section is connected to the corresponding sealing structure 200; at this time, the first tube body 131 located inside the second tube body 132 is also correspondingly provided with a plurality of first branch sections, and each first branch section is respectively located inside the corresponding second branch section, and the first branch section is penetrated through the sealing structure and connected to the internal cooling structure 120.

[0147] Similarly, between the liquid inlet end of the liquid cooling unit 110 for introducing and recovering the coolant and the sealing structure 200, and between the air inlet end of the gas unit 400 for introducing and recovering the firefighting gas and the cooling structure 120, the first tube body 131 and the second tube body 132 of the transmission pipeline 130 are connected in the above manner, so that a gas path is formed in parallel between multiple sealing structures 200. In addition, an exhaust pipe is also provided on the second tube body 132 between the air inlet end of the gas unit 400 and the cooling structure 120, and a solenoid valve is provided on the exhaust pipe, and the solenoid valve is only opened when the battery module 310 has thermal runaway, so that the combustible smoke generated by the battery module 310 during thermal runaway can be discharged from the exhaust pipe 133 along with the firefighting gas, which can reduce the impact of the combustible smoke on the gas unit 400.

[0148] In a third aspect, an embodiment of the present application further provides an energy storage power station, including the energy storage system 1000 as described above.

[0149] It can be understood that the energy storage power station may include one set of the above-mentioned energy storage system 1000, and the energy storage power station may also include multiple sets of energy storage systems 1000.

[0150] The energy storage power station provided in the embodiment of the present application includes the above-mentioned energy storage system 1000. Based on the low probability of condensation in the energy storage system 1000, the probability of condensation in the energy storage power station is also low, and the operation of the energy storage power station is more reliable.

[0151] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cooling system, characterized in that: include: Sealed structure; a cooling structure, wherein the cooling structure is disposed in the sealing structure; A liquid cooling unit, used for providing cooling liquid; as well as The transmission pipeline includes a first tube body and a second tube body, the first tube body connects the liquid cooling unit and the cooling structure to form a cooling circuit; the second tube body is sleeved on the part of the first tube body located outside the sealing structure, and the second tube body is connected to the sealing structure.

2. The cooling system according to claim 1, characterized in that: The first tube body includes at least one of an insulating tube body and a metal tube body; and / or the second tube body includes at least one of an insulating tube body and a metal tube body.

3. The cooling system according to claim 1 or 2, characterized in that: The number of the cooling structures is two or more, and liquid paths are formed in parallel between the cooling structures.

4. The cooling system according to any one of claims 1 to 3, characterized in that: The cooling system comprises a gas generating device for providing protective gas, and the second pipe body is connected to the gas generating device and the sealing structure to form a loop.

5. The cooling system according to claim 4, characterized in that: The number of the sealing structures is two or more, and gas paths are formed in parallel between the sealing structures.

6. The cooling system according to claim 4 or 5, characterized in that: The inner diameter of the second tube body can be determined by the inner diameter of the first tube body and an influencing factor, wherein the influencing factor includes the length of the second tube body, the type of the shielding gas, the temperature of the shielding gas, the flow rate of the shielding gas, and the flow rate of the coolant and the temperature of the coolant.

7. The cooling system according to claim 6, characterized in that: The inner diameter of the first tube is D1, and the inner diameter of the second tube is D2. Wherein, x is the first empirical coefficient, y is the second empirical coefficient, z is the third empirical coefficient, L is the characteristic length of the annular section of the second tube, C is the specific heat capacity of the shielding gas, Q1 is the flow rate of the coolant, t1 is the temperature of the coolant, t2 is the temperature of the shielding gas, t dew is the dew point temperature, μ is the dynamic viscosity of the shielding gas, V2 is the flow rate of the shielding gas, ρ2 is the density of the shielding gas, λ is the thermal conductivity of the shielding gas, l is the length of the second tube, and Pr is the Prandtl number of the shielding gas.

8. An energy storage system, characterized in that: include: Energy storage unit; as well as According to the cooling system according to any one of claims 1 to 7, the energy storage unit is arranged in the sealing structure, and the cooling structure is arranged on the energy storage unit.

9. The energy storage system according to claim 8, characterized in that: The energy storage system includes a gas unit for providing fire-fighting gas, and the second pipe body connects the gas unit and the sealing structure to form a loop.

10. The energy storage system according to claim 9, characterized in that: The energy storage unit includes a battery module, and the battery module is arranged in at least one of the sealing structures.

11. The energy storage system according to claim 9 or 10, characterized in that: The energy storage unit includes a power module, and the power module is arranged in at least one of the sealing structures.

12. The energy storage system according to any one of claims 9 to 11, characterized in that: The energy storage system further comprises an exhaust structure, and the exhaust structure is arranged at any position between the sealing structure and the gas inlet end of the gas unit.

13. The energy storage system according to claim 12, characterized in that: The exhaust structure is provided with an on-off structure.

14. The energy storage system according to any one of claims 8 to 13, characterized in that: The energy storage system includes an equipotential region and a non-equipotential region, the second pipe body includes an insulating pipe section and a metal pipe section, the insulating pipe section is arranged in the non-equipotential region, and the metal pipe section is arranged in the equipotential region.

15. An energy storage power station, characterized in that: Comprising the energy storage system as claimed in claims 8 to 14.

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