Energy storage device, energy storage system and charging network

Abstract

The utility model relates to the technical field of energy storage devices, and provides an energy storage device, an energy storage system and a charging network, the energy storage device comprises a battery device and a heat management module, the battery device is provided with a heat exchange structure, the heat management module comprises a liquid cooling unit and a connecting pipe, the liquid cooling unit is communicated with the heat exchange structure through the connecting pipe, the inner diameter of part of the pipe section of the connecting pipe is larger than that of the other part of the pipe section of the connecting pipe; according to the energy storage device provided by the embodiment of the invention, the inner diameter of part of the pipe section of the connecting pipe is larger than that of the other part of the pipe section of the connecting pipe, and the flow resistance of the pipe section with the larger inner diameter is relatively lower, so that the overall flow resistance between the liquid cooling unit and the heat exchange structure is effectively reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular provides an energy storage device, an energy storage system, and a charging network. Background Technology

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] Energy storage devices serve as supplementary and backup systems for the power grid. The batteries within these devices generate significant heat during high-power operation. Therefore, energy storage devices place high demands on the flow characteristics of the cooling medium in their thermal management modules, as these characteristics greatly influence battery lifespan. However, increasing the flow rate is limited by the overall pressure resistance of the thermal management module's piping. Exceeding certain pressure limits can lead to pipe rupture; furthermore, excessive flow resistance can result in excessive energy consumption. Utility Model Content

[0004] The purpose of this application is to provide an energy storage device, an energy storage system, and a charging network, aiming to solve the problem in the related art where the thermal management module of the energy storage device has large pipeline flow resistance, which affects the flow rate of the cooling medium in the pipeline.

[0005] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows:

[0006] In a first aspect, embodiments of this application provide an energy storage device, including a battery device and a thermal management module. The battery device is provided with a heat exchange structure, and the thermal management module includes a liquid cooler unit and a connecting pipe. The liquid cooler unit is connected to the heat exchange structure through the connecting pipe, wherein the inner diameter of a portion of the connecting pipe is larger than the inner diameter of another portion of the connecting pipe.

[0007] The beneficial effects of the embodiments of this application are as follows: The energy storage device provided in the embodiments of this application allows the liquid cooling unit to introduce cooling medium into the heat exchange structure through the connecting pipe, so that the cooling medium can exchange heat in the heat exchange structure to achieve heat dissipation for the battery device; wherein, the inner diameter of a part of the connecting pipe is larger than the inner diameter of another part of the connecting pipe, and the flow resistance of the pipe section with the larger inner diameter is relatively lower, thereby effectively reducing the overall flow resistance between the liquid cooling unit and the heat exchange structure.

[0008] In some embodiments, the connecting pipe includes a liquid-cooled pipe and a reducing pipe, which are connected in series, and at least a portion of the reducing pipe has an inner diameter larger than that of the liquid-cooled pipe.

[0009] By adopting the above technical solution, at least some sections of the pipe with larger inner diameter are connected in series to the liquid cooling pipeline for use, so as to effectively reduce the overall flow resistance between the liquid cooling unit and the heat exchange structure.

[0010] In some embodiments, multiple battery devices are stacked to form a battery assembly; the liquid cooling pipeline includes a first pipeline, a second pipeline, and a third pipeline, one end of the first pipeline is connected to a liquid cooling unit, one end of the second pipeline is connected to the first pipeline, the other end of the second pipeline extends toward the battery assembly, one end of the third pipeline is connected to the second pipeline, and the other end of the third pipeline is connected to a heat exchange structure within the corresponding battery assembly; a variable diameter pipeline is connected in series on the first pipeline, and at least a portion of the variable diameter pipeline has an inner diameter greater than the inner diameter of the first pipeline; and / or, a variable diameter pipeline is connected in series on the second pipeline, and at least a portion of the variable diameter pipeline has an inner diameter greater than the inner diameter of the second pipeline; and / or, a variable diameter pipeline is connected in series on the third pipeline, and at least a portion of the variable diameter pipeline has an inner diameter greater than the inner diameter of the second pipeline.

[0011] By adopting the above technical solution, a first pipeline is used to connect to the liquid cooling unit and to directly conduct the cooling medium with the cooling unit, a second pipeline is used to transmit the cooling medium towards the battery assembly, and a third pipeline is used to conduct the cooling medium to the heat exchange structure in the corresponding battery assembly to achieve heat exchange; wherein, a variable diameter pipeline can be used on the first pipeline and / or the second pipeline and / or the third pipeline, thereby reducing the flow resistance of the first pipeline and / or the second pipeline and / or the third pipeline.

[0012] In some embodiments, a variable diameter pipe is connected in series on a second pipe, with one end of the variable diameter pipe connected to a first pipe or a second pipe, and the other end of the variable diameter pipe connected to a second pipe or a third pipe.

[0013] By adopting the above technical solution, and by setting a variable diameter pipe in series on the second pipe, the cooling medium flow rate in the second pipe is large, and the layout space of the second pipe is sufficient, thereby reducing the assembly difficulty of the variable diameter pipe, and the variable diameter pipe has a better effect on reducing the flow resistance of the second pipe.

[0014] In some embodiments, the energy storage device further includes a housing, in which a plurality of battery modules are disposed; in the height direction of the housing, a first pipeline is located below the battery modules and extends along the arrangement direction of the battery modules, and a second pipeline is evenly distributed around each battery module, the second pipeline extending along the height direction of the housing and communicating with the first pipeline; wherein, a variable diameter pipeline is connected in series on the second pipeline, and the variable diameter pipeline is located below the battery modules.

[0015] By adopting the above technical solution, since there is sufficient space inside the housing below the battery pack, the section of the second pipeline located below the battery pack is connected in series with a variable diameter pipeline. The assembly space for the variable diameter pipeline is more sufficient, and at least one section of the variable diameter pipeline can be set with a larger inner diameter.

[0016] In some embodiments, there are multiple variable diameter pipes, which are connected in series on the liquid cooling pipe.

[0017] By adopting the above technical solution, which uses multiple variable diameter pipes connected in series on the liquid cooling pipeline, when one of them fails, only the variable diameter pipe at the location of the failure needs to be replaced, thereby reducing maintenance costs.

[0018] In some embodiments, at least two adjacent reducing pipes are connected.

[0019] By adopting the above technical solution, the proportion of variable diameter pipes replacing liquid cooling pipes can be effectively increased by directly connecting multiple adjacent variable diameter pipes, thereby further reducing the overall flow resistance between the liquid cooling unit and the heat exchange structure.

[0020] In some embodiments, the reducing pipe includes a main pipe section and connector pipe sections disposed at opposite ends of the main pipe section. The inner diameter of the main pipe section is larger than the inner diameter of the connector pipe sections and the inner diameter of the liquid cooling pipe. The connector pipe sections are connected to the liquid cooling pipe.

[0021] By adopting the above technical solution, the liquid cooling pipeline is connected using a joint pipe section, and the inner diameter of the main pipe section is set to be larger than that of the joint pipe section, so as to reduce the flow resistance of the main pipe section and thus reduce the overall flow resistance.

[0022] In some embodiments, the reducing pipe includes a main pipe section, an expanding pipe section, and a connector pipe section. The two opposite ends of the main pipe section are connected to the connector pipe section through the expanding pipe section. The inner diameter of one end of the expanding pipe section is equal to the inner diameter of the main pipe section, and the inner diameter of the other end of the expanding pipe section is equal to the inner diameter of the connector pipe section. The inner diameter of the main pipe section is greater than the inner diameter of the connector pipe section and the inner diameter of the liquid cooling pipe. The connector pipe section is connected to the liquid cooling pipe.

[0023] By adopting the above technical solution, the liquid cooling pipeline is connected by a joint pipe section. The main pipe section with a larger inner diameter is smoothly connected to the joint pipe section through the expansion pipe section, so as to reduce the disturbance and pressure loss when the cooling medium flows, thereby further reducing the flow resistance.

[0024] In some embodiments, the inner diameter of any segment of the reducing pipe is larger than the inner diameter of the liquid cooling pipe, and the reducing pipe is connected to the liquid cooling pipe through a connecting joint.

[0025] By adopting the above technical solution, the inner diameter of the variable diameter pipe can be set to be larger than the inner diameter of the liquid cooling pipe at any point. The variable diameter pipe is connected to the liquid cooling pipe through a connecting joint, so the variable diameter pipe with a larger inner diameter has a better effect on reducing flow resistance.

[0026] In some embodiments, at least a portion of the variable diameter conduit is a flexible section.

[0027] By adopting the above technical solutions, the stability of variable diameter pipelines can be improved by utilizing flexible pipe sections to compensate for displacement, damping, and absorb thermal expansion.

[0028] Secondly, embodiments of this application also provide an energy storage system, including a power conversion device and an energy storage device as described above, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0029] The beneficial effects of the embodiments of this application are as follows: The energy storage system provided in the embodiments of this application includes the above-mentioned energy storage device. On the basis of the better cooling effect of the above-mentioned energy storage device, the cooling effect of the energy storage system is also better.

[0030] Thirdly, embodiments of this application also provide a charging network, including a charging pile and an energy storage device or energy storage system as described above, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0031] The beneficial effects of the embodiments of this application: The charging network provided by the embodiments of this application includes the energy storage device or the energy storage system described above. Therefore, the charging network has a better cooling effect. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the energy storage device provided in the embodiments of this application;

[0034] Figure 2 This is a schematic diagram of the structure of a first type of variable diameter pipeline provided in the embodiments of this application;

[0035] Figure 3 An internal cross-sectional view of a first type of reducing pipe provided in this application embodiment;

[0036] Figure 4 for Figure 3 A magnified view of part A;

[0037] Figure 5 This is a schematic diagram of the structure of a second type of variable diameter pipeline provided in the embodiments of this application;

[0038] Figure 6 An internal cross-sectional view of a second type of variable diameter pipe provided in an embodiment of this application;

[0039] Figure 7 for Figure 6 A magnified view of part B;

[0040] Figure 8 A schematic diagram of a third type of variable diameter pipeline connected to a liquid cooling pipe via a connecting structure, as provided in an embodiment of this application;

[0041] Figure 9 A schematic diagram of an energy storage system provided in an embodiment of this application;

[0042] Figure 10 This is a schematic diagram of a charging network provided in an embodiment of this application.

[0043] The following are the labeling elements in the figure:

[0044] 1000, Energy storage device; 2000, Energy storage system; 2100, Power conversion device; 2200, Power generation device; 3000, Charging network; 3100, Charging pile; 3110, Connector;

[0045] 100. Battery device; 110. Heat exchange structure; 101. Battery assembly;

[0046] 200. Thermal management module; 201. Connecting pipe; 210. Liquid chiller unit; 220. Liquid cooling pipeline; 221. First pipeline; 222. Second pipeline; 223. Third pipeline; 230. Reducing pipeline; 2301. Flexible pipe section; 231. Main pipe section; 232. Joint pipe section; 233. Expanded pipe section; 240. Connecting joint;

[0047] 300, box; H, height direction; D, length direction. Detailed Implementation

[0048] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0049] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0053] Energy storage devices serve as supplementary and backup systems for the power grid. The batteries within these devices generate significant heat during high-power operation. Therefore, energy storage devices place high demands on the flow characteristics of the cooling medium in their thermal management modules, as these characteristics greatly influence battery lifespan. However, increasing the flow rate is limited by the overall pressure resistance of the thermal management module's piping. Exceeding certain pressure limits can lead to pipe rupture; furthermore, excessive flow resistance can result in excessive energy consumption.

[0054] Based on the above considerations, in order to solve the problem that the large flow resistance of the pipeline in the thermal management module of the energy storage device affects the flow rate of the cooling medium in the pipeline, an energy storage device is designed. The liquid cooler unit in the thermal management module of the energy storage device is connected to the heat exchange structure of the battery device through a connecting pipe. The inner diameter of a section of the connecting pipe is set to be larger, so the flow resistance of the section with a larger inner diameter is lower. As a result, the overall flow resistance of the connecting pipe is effectively reduced, and the influence of the connecting pipe between the liquid cooler unit and the heat exchange structure on the flow rate of the cooling medium is reduced, thus making the cooling effect of the thermal management module better.

[0055] The energy storage devices disclosed in this application can be used, but are not limited to, in fixed or mobile energy stations, such as energy storage containers, energy storage distribution cabinets, energy storage power stations, and battery swapping stations.

[0056] The energy storage device provided in the embodiments of this application will now be described.

[0057] Please refer to Figure 1 This application provides an energy storage device 1000, including one or more battery modules 101 to increase the voltage and capacity of the energy storage device 1000. The battery module 101 may include multiple battery devices 100, which are connected in series via a busbar to increase the voltage of the energy storage device 1000. When the energy storage device 1000 includes multiple battery modules 101, the multiple battery modules 101 are connected in parallel to increase the capacity of the energy storage device 1000.

[0058] The battery device 100 may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0060] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0061] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more battery cell assemblies housed within the housing.

[0062] As an example, the battery cell assembly can be a battery module, which can be housed in the housing by fixing the battery module in the housing.

[0063] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0064] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0065] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0066] The energy storage device 1000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 1000 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1000 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the energy storage device 1000.

[0067] In some embodiments, the energy storage device 1000 is an energy storage container or an energy storage cabinet.

[0068] In some embodiments, the energy storage device 1000 may include a cabinet and one or more battery clusters, the battery clusters being housed within the cabinet.

[0069] In some embodiments, the energy storage device 1000 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0070] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping for regulating the temperature of the individual battery cells.

[0071] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0072] As an example, the central control module can serve as the battery management unit of the energy storage device 1000, used for monitoring and managing the energy storage device 1000. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 1000. For example, it can control the charging and discharging current and voltage of the energy storage device 1000. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0073] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0074] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 1000 that require electricity.

[0075] Please refer to Figure 1 and Figure 2 In some embodiments, this application provides an energy storage device 1000, including a battery device 100 and a thermal management module 200. The battery device 100 is provided with a heat exchange structure 110. The thermal management module 200 includes a liquid cooler unit 210 and a connecting pipe 201. The liquid cooler unit 210 is connected to the heat exchange structure 110 through the connecting pipe 201. The inner diameter of a portion of the connecting pipe 201 is larger than the inner diameter of another portion of the connecting pipe 201.

[0076] The thermal management module 200 is used to circulate and provide cooling medium. The thermal management module 200 includes a liquid chiller 210, liquid cooling pipelines 220, and a variable diameter pipeline 230; wherein, the liquid chiller 210 is used to perform refrigeration operation on the cooling medium. Exemplarily, the liquid chiller 210 includes, but is not limited to, a condenser, a compressor, a plate heat exchanger, etc., and uses the condenser, compressor, and plate heat exchanger to achieve circulatory refrigeration of the cooling medium.

[0077] The battery device 100 is provided with a heat exchange structure 110. Optionally, the heat exchange structure 110 may be, but is not limited to, a heat exchange plate, a heat exchange tube, or a flow channel integrated into the wall panel of the battery device 100. The liquid cooling unit 210 can provide a cooling medium to the heat exchange structure 110 through the connecting pipe 201, so that the cooling medium absorbs the heat generated by the battery device 100 in the heat exchange structure 110 to achieve the purpose of cooling.

[0078] The connecting pipe 201 is used to supply the flow of cooling medium; optionally, the material of the connecting pipe 201 can be an insulating material (such as polyvinylidene fluoride, polypropylene, etc.) or a metal material (such as stainless steel pipe, aluminum pipe, copper pipe, alloy pipe, etc.).

[0079] The inner diameter of a portion of the connecting pipe 201 is larger than that of another portion of the connecting pipe 201. It should be understood that the portion of the connecting pipe 201 with the smaller inner diameter is the conventional section, while the other portion with the larger inner diameter is the expanded section. Since, for a given flow rate, a larger inner diameter pipe has lower flow resistance, expanding a portion of the connecting pipe 201 to have an inner diameter larger than that of the other portion will reduce the overall flow resistance of the connecting pipe 201.

[0080] The energy storage device 1000 provided in this application embodiment allows the liquid cooling unit 210 to introduce cooling medium into the heat exchange structure 110 through the connecting pipe 201. This allows the cooling medium to exchange heat in the heat exchange structure 110 to dissipate heat from the battery device 100. In this embodiment, the inner diameter of a portion of the connecting pipe 201 is larger than that of another portion of the connecting pipe 201. The larger inner diameter portion has a relatively lower flow resistance. As a result, the overall flow resistance between the liquid cooling unit 210 and the heat exchange structure 110 is effectively reduced, and the connecting pipe 201 has a lower impact on the flow rate of the cooling medium.

[0081] Please refer to Figure 1 and Figure 2 In some embodiments, the connecting pipe 201 includes a liquid cooling pipe 220 and a reducing pipe 230, which are connected in series. At least a portion of the reducing pipe 230 has an inner diameter larger than that of the liquid cooling pipe 220.

[0082] Liquid cooling pipe 220 refers to the pipe body in connecting pipe 201 that does not include the expanded diameter section, that is, it includes the section with a relatively smaller inner diameter. Liquid cooling pipe 220 can be directly connected to liquid cooling unit 210 and heat exchange structure 110.

[0083] The reducing pipe 230 refers to the pipe body in the connecting pipe 201 that includes the expanded pipe section, that is, the pipe body including the section with a relatively larger inner diameter. Thus, at least a portion of the inner diameter of the reducing pipe 230 is larger than the inner diameter of the liquid cooling pipe 220. The reducing pipe 230 and the liquid cooling pipe 220 are connected in series; optionally, one end of the reducing pipe 230 can be directly connected to the liquid cooling unit 210, or one end of the reducing pipe 230 can be directly connected to the heat exchange structure 110, or both ends of the reducing pipe 230 can be connected to the liquid cooling pipe 220. The number of reducing pipes 230 can be one, two, or more than two.

[0084] When the variable diameter pipe 230 is connected to the liquid cooling unit 210, the liquid cooling pipe 220 or the heat exchange structure 110, it can be connected by pipe joints, or it can be directly connected by sleeve, plug, welding or other means.

[0085] At least a portion of the inner diameter of the reducing pipe 230 is larger than the inner diameter of the liquid cooling pipe 220. Optionally, the inner diameter of the entire reducing pipe 230 is larger than that of the liquid cooling pipe 220; exemplaryly, in some embodiments, the inner diameter of the reducing pipe 230 is larger than that of the liquid cooling pipe 220, and the inner diameter is equal at all points in the reducing pipe 230; or, in other embodiments, the inner diameter of the reducing pipe 230 is larger than that of the liquid cooling pipe 220, and a portion of the inner diameter of the reducing pipe 230 is larger than another portion of the inner diameter, for example, a portion of the inner diameter of the middle section of the reducing pipe 230 is larger than a portion of the inner diameter of the two end sections of the reducing pipe 230. It should be understood that when the inner diameters of the reducing pipe 230 and the liquid cooling pipe 220 are different at the connection point, an adapter can be used for connection. The reducing pipe 230 and the liquid cooling pipe 220 are respectively fitted onto different connection ends of the adapter to achieve connection and conduction between the reducing pipe 230 and the liquid cooling pipe 220.

[0086] Alternatively, the inner diameter of a portion of the reducing pipe 230 is larger than the inner diameter of the liquid cooling pipe 220, while the inner diameter of another portion of the reducing pipe 230 is equal to the inner diameter of the liquid cooling pipe 220. For example, in some embodiments, the inner diameter of a portion of the middle section of the reducing pipe 230 is larger than the inner diameter of a portion of the inner diameter of both end sections of the reducing pipe 230, and the inner diameter of a portion of the inner diameter of both end sections of the reducing pipe 230 is equal to the inner diameter of the liquid cooling pipe 220; thus, the reducing pipe 230 can be more easily connected to the liquid cooling pipe 220.

[0087] With this configuration, a variable-diameter pipe 230 with a larger inner diameter in at least part of the pipe section is connected in series to the liquid cooling pipe 220 for use, so as to effectively reduce the overall flow resistance between the liquid cooling unit 210 and the heat exchange structure 110.

[0088] Please refer to Figure 1 and Figure 2In some embodiments, multiple battery devices 100 are stacked to form a battery assembly 101; the liquid cooling pipeline 220 includes a first pipeline 221, a second pipeline 222, and a third pipeline 223. One end of the first pipeline 221 is connected to the liquid cooling unit 210, one end of the second pipeline 222 is connected to the first pipeline 221, and the other end of the second pipeline 222 extends toward the battery assembly 101. One end of the third pipeline 223 is connected to the second pipeline 222, and the other end of the third pipeline 223 is connected to the corresponding battery assembly 101. Heat exchange structure 110; a reducing pipe 230 is connected in series on the first pipe 221, and the inner diameter of at least a portion of the reducing pipe 230 is larger than the inner diameter of the first pipe 221; and / or, a reducing pipe 230 is connected in series on the second pipe 222, and the inner diameter of at least a portion of the reducing pipe 230 is larger than the inner diameter of the second pipe 222; and / or, a reducing pipe 230 is connected in series on the third pipe 223, and the inner diameter of at least a portion of the reducing pipe 230 is larger than the inner diameter of the second pipe 222.

[0089] The liquid cooling pipeline 220 includes a first pipeline 221, a second pipeline 222 and a third pipeline 223; wherein, the first pipeline 221 refers to the main pipeline directly connected to the liquid cooling unit 210, and the first pipeline 221 is used to extract the cooling medium from the liquid cooling unit 210.

[0090] The second conduit 222 is used to distribute the cooling medium from the first conduit 221 to the periphery of each battery assembly 101; the number of second conduits 222 can be one or more, and in some embodiments, the number of second conduits 222 is the same as the number of battery assemblies 101. It should be understood that the inner diameter of the second conduit 222 is smaller than the inner diameter of the first conduit 221, but the second conduit 222 still has sufficient inner diameter to allow the cooling medium to flow at a large flow rate.

[0091] The third conduit 223 is used to distribute the cooling medium from the second conduit 222 to each battery device 100 within the corresponding battery assembly 101. It should be understood that the inner diameter of the third conduit 223 is smaller than the inner diameter of the second conduit 222, and the third conduit 223 is capable of specifically distributing the cooling medium in the second conduit 222 to the heat exchange structure 110 of the corresponding battery device 100.

[0092] In this embodiment, a variable diameter pipe 230 can be connected in series on the first pipe 221. One end of the variable diameter pipe 230 can be directly connected to the liquid cooling unit 210 or connected to the first pipe 221, and the other end of the variable diameter pipe 230 can be connected to either the first pipe 221 or the second pipe 222. One or more variable diameter pipes 230 can be connected in series on the first pipe 221, and at least a portion of the inner diameter of the variable diameter pipe 230 is larger than that of the first pipe 221 to reduce overall flow resistance.

[0093] Alternatively, a reducing pipe 230 can be connected in series on the second pipe 222. One end of the reducing pipe 230 can be connected to the first pipe 221 or the second pipe 222, and the other end of the reducing pipe 230 can be connected to the second pipe 222 or the third pipe 223. One or more reducing pipes 230 can be connected in series on the second pipe 222, and at least a portion of the reducing pipe 230 has an inner diameter larger than that of the second pipe 222 to reduce overall flow resistance.

[0094] Alternatively, a reducing pipe 230 can be connected in series with the third pipe 223. One end of the reducing pipe 230 can be connected to the second pipe 222 or the third pipe 223, and the other end of the reducing pipe 230 can be connected to the third pipe 223 or the heat exchange structure 110. One or more reducing pipes 230 can be connected in series with the third pipe 223, and at least a portion of the reducing pipe 230 has an inner diameter larger than that of the third pipe 223 to reduce overall flow resistance.

[0095] Alternatively, a reducing pipe 230 can be connected in series on both the first pipe 221 and the second pipe 222. At the same time, at least a portion of the reducing pipe 230 connected in series on the first pipe 221 has an inner diameter greater than that of the first pipe 221, and at least a portion of the reducing pipe 230 connected in series on the second pipe 222 has an inner diameter greater than that of the second pipe 222.

[0096] Alternatively, a reducing pipe 230 can be connected in series on both the second pipe 222 and the third pipe 223. At the same time, at least a portion of the reducing pipe 230 connected in series on the second pipe 222 has an inner diameter greater than that of the second pipe 222, and at least a portion of the reducing pipe 230 connected in series on the third pipe 223 has an inner diameter greater than that of the third pipe 223.

[0097] Alternatively, a reducing pipe 230 can be connected in series on the first pipe 221, the second pipe 222, and the third pipe 223 simultaneously; at least a portion of the reducing pipe 230 connected in series on the first pipe 221 has an inner diameter larger than the first pipe 221, at least a portion of the reducing pipe 230 connected in series on the second pipe 222 has an inner diameter larger than the second pipe 222, and at least a portion of the reducing pipe 230 connected in series on the third pipe 223 has an inner diameter larger than the third pipe 223.

[0098] With this configuration, the variable diameter pipe 230 can be used on the first pipe 221 and / or the second pipe 222 and / or the third pipe 223, thereby reducing the overall flow resistance between the liquid cooler unit 210 and the heat exchange structure 110.

[0099] Please refer to Figure 1 and Figure 2In some embodiments, the variable diameter pipe 230 is connected in series with the second pipe 222, one end of the variable diameter pipe 230 is connected to the first pipe 221 or the second pipe 222, and the other end of the variable diameter pipe 230 is connected to the second pipe 222 or the third pipe 223.

[0100] In this embodiment, the variable diameter pipe 230 is connected in series on the second pipe 222; wherein, the variable diameter pipe 230 can be connected in series at any point on the second pipe 222, for example, the variable diameter pipe 230 can be connected in series at one end near the first pipe 221, or the variable diameter pipe 230 can be connected in series at one end near the third pipe 223, or the variable diameter pipe 230 can be connected in series in the middle section of the second pipe 222, etc.

[0101] It should be understood that the second conduit 222 is used to divert the cooling medium from the first conduit 221 so that the cooling medium flows to each battery assembly 101; therefore, the flow rate in the second conduit 222 is relatively large. With this configuration, by connecting a variable diameter conduit 230 in series on the second conduit 222 and replacing part of the second conduit 222 with the variable diameter conduit 230, the overall flow resistance between the first conduit 221 and the third conduit 223 can be effectively reduced.

[0102] Please refer to Figure 1 and Figure 2 In some embodiments, the energy storage device 1000 further includes a housing 300, in which a plurality of battery modules 101 are disposed; in the height direction H of the housing 300, a first pipe 221 is located below the battery modules 101 and extends along the arrangement direction of the battery modules 101, and a second pipe 222 is evenly distributed around the periphery of each battery module 101, the second pipe 222 extends along the height direction H of the housing 300 and is connected to the first pipe 221; wherein, a variable diameter pipe 230 is connected in series on the second pipe 222, and the variable diameter pipe 230 is located below the battery modules 101.

[0103] The housing 300 is used to house the battery modules 101. Optionally, the interior of the housing 300 can be constructed using partitions, mounting beams, supports, or other structures to form a storage compartment for accommodating the battery modules 101. Furthermore, when there are multiple battery modules 101 (e.g., two, three, four, or more), the multiple battery modules 101 can be arranged sequentially along any direction of the housing 300. For example, taking the energy storage device 1000 as an energy storage container, four battery modules 101 can be arranged along the length direction D inside the housing 300 of the energy storage container. Each battery module 101 includes multiple battery devices 100, and the multiple battery devices 100 can be stacked along the height direction H of the housing 300.

[0104] Understandably, when multiple battery modules 101 are distributed along the length direction D of the housing 300, the first pipe 221 extends along the length direction D of the housing 300 so that the first pipe 221 can be laid under each battery module 101.

[0105] The second pipe 222 extends along the height direction H of the housing 300 and is arranged around the battery assembly 101. For example, when there are four battery assemblies 101 in the housing 300, the second pipe 222 is evenly arranged around the four battery assemblies 101, and the second pipe 222 extends along the height direction H of the housing 300 and connects to the first pipe 221. In this way, the third pipe 223 connected to the second pipe 222 can be routed more conveniently and connected to the heat exchange structure 110 in the corresponding battery assembly 101.

[0106] It should be understood that there is a large space below the battery assembly 101 within the housing 300; therefore, using a larger variable diameter pipe 230 to replace the second pipe 222 below the battery assembly 101 has a lower impact on the internal space layout of the housing 300, and the variable diameter pipe 230 can adopt a larger inner diameter scheme to effectively reduce the overall flow resistance.

[0107] Specifically, the variable diameter conduit 230 is connected in series to the portion of the second conduit 222 located below the battery assembly 101; one end of the variable diameter conduit 230 can be connected to either the first conduit 221 or the second conduit 222, and the other end of the variable diameter conduit 230 is connected to the second conduit 222. The number of variable diameter conduits 230 connected in series on the second conduit 222 can be any number of one, two, or more.

[0108] This configuration makes the assembly and maintenance of the reducing pipe 230 simpler, and the reducing pipe 230 can use a larger inner diameter to further improve the overall flow resistance.

[0109] Please refer to Figure 1 and Figure 2 In some embodiments, there are multiple variable diameter pipes 230, which are connected in series on the liquid cooling pipe 220.

[0110] The number of reducing pipes 230 can be two, three, four or more.

[0111] The reducing pipe 230 is connected in series on the liquid cooling pipe 220; optionally, multiple reducing pipes 230 can be connected in series on the first pipe 221; or, multiple reducing pipes 230 can be connected in series on the second pipe 222; or, multiple reducing pipes 230 can be connected in series on the third pipe 223; or, at least one reducing pipe 230 can be connected in series on both the first pipe 221 and the second pipe 222; or, at least one reducing pipe 230 can be connected in series on both the second pipe 222 and the third pipe 223; or, at least one reducing pipe 230 can be connected in series on the first pipe 221, the second pipe 222, and the third pipe 223.

[0112] Adjacent reducing pipes 230 can be connected by liquid cooling pipes 220; for example, within the range of the first pipe 221, adjacent reducing pipes 230 can be connected by the first pipe 221; or, within the range of the second pipe 222, adjacent reducing pipes 230 can be connected by the second pipe 222.

[0113] Alternatively, adjacent reducing pipes 230 can be directly connected, for example, one end of one reducing pipe 230 can be connected to one end of another reducing pipe 230.

[0114] With this configuration, multiple variable diameter pipes 230 are connected in series on the liquid cooling pipe 220. When one of them fails, only the variable diameter pipe 230 at the location of the failure needs to be replaced, thereby saving materials and reducing maintenance costs.

[0115] Please refer to Figure 1 and Figure 2 In some embodiments, at least two adjacent reducing pipes 230 are connected.

[0116] At least two adjacent reducing pipes 230 are connected; optionally, among the plurality of reducing pipes 230, each pair of adjacent reducing pipes 230 are connected.

[0117] Among them, two adjacent reducing pipes 230 can be connected by plugging in a connector or by welding to form a conductive connection.

[0118] In this way, multiple variable diameter pipes 230 can be connected in sequence to form a series connection to replace the liquid cooling pipe 220.

[0119] This configuration, by directly connecting multiple variable diameter pipes 230 adjacent to each other, can effectively increase the proportion of variable diameter pipes 230 replacing liquid cooling pipes 220, thereby further reducing the overall flow resistance between the liquid cooling unit 210 and the heat exchange structure 110.

[0120] Please refer to Figure 1 , Figures 5 to 7 In some embodiments, the reducing pipe 230 includes a main pipe section 231 and connector pipe sections 232 disposed at opposite ends of the main pipe section 231. The inner diameter of the main pipe section 231 is larger than the inner diameter of the connector pipe section 232 and the inner diameter of the liquid cooling pipe 220. The connector pipe section 232 is connected to the liquid cooling pipe 220.

[0121] The main pipe section 231 is the main part of the reducing pipe section 230. In some embodiments, the main pipe section 231 can be a pipe of equal diameter, and the inner diameter of the main pipe section 231 is larger than that of the connector pipe section 232.

[0122] Connector pipe sections 232 are disposed at opposite ends of the main pipe section 231, and are used to connect to the liquid cooling pipeline 220. In some embodiments, connector pipe sections 232 may also be connected to the liquid cooling unit 210 or the heat exchange structure 110.

[0123] The connector section 232 can be integrally formed with the main pipe section 231; or, the connector section 232 can be fixedly connected to the main pipe section 231 by welding or other means to form an integral unit. In some embodiments, the inner diameter of the connector section 232 is the same as the inner diameter of the liquid cooling pipe 220, so as to facilitate the connection and conduction of the connector section 232 to the liquid cooling pipe 220.

[0124] It should be understood that the inner diameter of the main pipe section 231 is larger than the inner diameter of the connector pipe section 232. Therefore, when the end of the main pipe section 231 connects to the connector pipe section 232, the different inner diameters of the main pipe section 231 and the connector pipe section 232 will create a stepped structure, such as... Figure 7 As shown.

[0125] With this configuration, the liquid cooling pipeline 220 can be connected using the connector pipe section 232, while the inner diameter of the main pipe section 231 is set to be larger than that of the connector pipe section 232, so as to reduce the flow resistance of the main pipe section 231 and thus reduce the overall flow resistance.

[0126] Please refer to Figures 1 to 4 In some embodiments, the reducing pipe 230 includes a main pipe section 231, an expanding pipe section 233, and a connector pipe section 232. The two ends of the main pipe section 231 are connected to the connector pipe section 232 through the expanding pipe section 233. The inner diameter of one end of the expanding pipe section 233 is equal to the inner diameter of the main pipe section 231, and the inner diameter of the other end of the expanding pipe section 233 is equal to the inner diameter of the connector pipe section 232. The inner diameter of the main pipe section 231 is greater than the inner diameter of the connector pipe section 232 and the inner diameter of the liquid cooling pipe 220. The connector pipe section 232 is connected to the liquid cooling pipe 220.

[0127] In this embodiment, an expanding pipe section 233 is added between the main pipe section 231 and the connector pipe section 232; wherein, the expanding pipe section 233 refers to a pipe section structure with a gradually increasing inner diameter. Thus, the connector pipe section 232 is connected to the main pipe section 231 via the expanding pipe section 233, allowing the smaller inner diameter connector pipe section 232 to more smoothly connect to the larger inner diameter main pipe section 231 via the expanding pipe section 233, specifically as follows... Figure 4 As shown.

[0128] The main pipe section 231, the expansion pipe section 233, and the joint pipe section 232 can be an integral structure; or, the main pipe section 231, the expansion pipe section 233, and the joint pipe section 232 can be fixedly connected by welding or other means to form an integral structure.

[0129] With this configuration, the liquid cooling pipeline 220 is connected using the connector pipe section 232, and the main pipe section 231 with a larger inner diameter is smoothly connected to the connector pipe section 232 through the expansion pipe section 233, so as to reduce the disturbance and pressure loss when the cooling medium flows, thereby further reducing the flow resistance.

[0130] Please refer to Figure 1 and Figure 8 In some embodiments, the inner diameter of any segment of the reducing pipe 230 is larger than the inner diameter of the liquid cooling pipe 220, and the reducing pipe 230 is connected to the liquid cooling pipe 220 through the connecting joint 240.

[0131] In this process, the inner diameter of any segment of the reducing pipe 230 is greater than the inner diameter of the liquid cooling pipe 220; optionally, the inner diameters of all segments of the reducing pipe 230 are equal; or, the inner diameter of some segments of the reducing pipe 230 is greater than the inner diameter of another segment, and the minimum inner diameter of the reducing pipe 230 is greater than the inner diameter of the liquid cooling pipe 220.

[0132] The reducing pipe 230 and the liquid cooling pipe 220 can be connected and connected via a connecting joint 240. The connecting joint 240 is a fitting used to connect two pipe sections and can be made of metal, plastic, or other materials. In use, it can be fixed to the reducing pipe 230 and the liquid cooling pipe 220 by means of threads, welding, or insertion. Exemplarily, in some embodiments, the connecting joint 240 can be a reducing joint, i.e., the two ends of the reducing joint have different sizes, thereby allowing the liquid cooling pipe 220 and the reducing pipe 230, which have different inner diameters, to be connected and connected via the reducing joint.

[0133] With this configuration, the inner diameter of the variable diameter pipe 230 can be set to be larger than the inner diameter of the liquid cooling pipe 220 at any point. The variable diameter pipe 230 is connected to the liquid cooling pipe 220 through the connecting joint 240, so the variable diameter pipe 230 with a larger inner diameter has a better effect in reducing flow resistance.

[0134] Please refer to Figure 2and Figure 3 In some embodiments, at least a portion of the variable diameter conduit 230 is a flexible pipe section 2301.

[0135] Optionally, the flexible pipe section 2301 includes, but is not limited to, corrugated pipes, flexible hoses, and other pipes with good flexibility. For example, taking a corrugated pipe as the flexible pipe section 2301, the entire variable diameter pipe 230 can be a corrugated pipe structure, or the variable diameter pipe 230 can be composed of corrugated pipes and stainless steel pipes connected together; the corrugated pipe can be used to realize displacement compensation when the variable diameter pipe 230 is connected to the liquid cooling pipe 220.

[0136] This design utilizes the flexible pipe section 2301 to compensate for displacement, damping, and absorb thermal expansion in the variable diameter pipe 230, thereby improving the stability and ease of installation of the variable diameter pipe 230.

[0137] The energy storage device 1000 provided in this application will now be further described according to specific embodiments.

[0138] Please refer to Figures 1 to 4 In this embodiment, the energy storage device 1000 can be an energy storage container, which includes a container body 300, battery modules 101, and a thermal management module 200. The battery modules 101 are housed within the container body 300, and multiple battery modules 101 are arranged sequentially along the length direction D of the container body 300. Each battery module 101 includes multiple battery devices 100 arranged along the height direction H of the container body 300, and these battery devices 100 are connected in series. A heat exchange structure 110 is provided on each battery device 100.

[0139] The thermal management module 200 includes a liquid chiller unit 210 and a connecting pipe 201. The connecting pipe 201 includes a liquid chiller pipe 220 and a reducing pipe 230 connected in series. The liquid chiller unit 210 is connected to the heat exchange structure 110 through the liquid chiller pipe 220 and the reducing pipe 230. The reducing pipe 230 includes a main pipe section 231, an expanded pipe section 233, and a connector pipe section 232. The opposite ends of the main pipe section 231 are connected to the connector pipe section 232 through the expanded pipe section 233. The inner diameter of one end of the expanded pipe section 233 is equal to the inner diameter of the main pipe section 231, and the inner diameter of the other end of the expanded pipe section 233 is equal to the inner diameter of the connector pipe section 232. The inner diameter of the main pipe section 231 is greater than the inner diameter of the connector pipe section 232 and the inner diameter of the liquid chiller pipe 220.

[0140] The liquid cooling pipeline 220 includes a first pipeline 221, a second pipeline 222, and a third pipeline 223. One end of the first pipeline 221 is connected to the liquid cooling unit 210, and the first pipeline 221 is located below the battery assembly 101 and extends along the arrangement direction of the battery assembly 101. Second pipelines 222 are evenly distributed around the periphery of each battery assembly 101, and the second pipelines 222 extend along the height direction H of the housing 300 and connect to the first pipeline 221. One end of the third pipeline 223 is connected to the second pipeline 222, and the other end of the third pipeline 223 is connected to the heat exchange structure 110 within the corresponding battery assembly 101. Multiple variable diameter pipelines 230 can be connected in series on the second pipeline 222, and the multiple variable diameter pipelines 230 are located below the battery assembly 101.

[0141] Please refer to Figure 1 and Figure 9 Secondly, embodiments of this application also provide an energy storage system 2000, including a power conversion device 2100 and an energy storage device 1000 as described above, wherein the power conversion device 2100 is used to electrically connect the power generation device 2200 and the energy storage device 1000.

[0142] In some embodiments, the energy storage system 2000 may include one or more energy storage devices 1000 and a power conversion device 2100, wherein the power conversion device 2100 is connected between the power generation device 2200 and the energy storage device 1000. The power generation device 2200 generates electrical energy, which can be stored in the energy storage device 1000 via the power conversion device 2100. As an example, the power generation device 2200 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 2200 is not limited in this application.

[0143] The energy storage system 2000 provided in this application embodiment includes the aforementioned energy storage device 1000. Based on the superior cooling effect of the aforementioned energy storage device 1000, the energy storage system 2000 also has a superior cooling effect.

[0144] Please refer to Figure 1 , Figure 9 and Figure 10 Thirdly, embodiments of this application also provide a charging network 3000, including a charging pile 3100 and an energy storage device 1000 or an energy storage system 2000 as described above, wherein the energy storage device 1000 is used to provide electrical energy to the charging pile 3100.

[0145] This application provides a charging network 3000, including a charging pile 3100 and an energy storage device 1000. The charging pile 3100 is electrically connected to the energy storage device 1000, which provides electrical energy to the charging pile 3100. The charging pile 3100 is electrically connected to a battery device 100 in the energy storage device 1000 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 3100. The charging pile 3100 has one or more connectors 3110 for connecting to an electrical device (such as a vehicle), thereby providing power to the electrical device.

[0146] The energy storage device 1000 can be located inside the charging pile 3100 (e.g., an integrated energy storage and charging unit) or outside the charging pile 3100.

[0147] The charging network 3000 provided in this application embodiment includes the energy storage device 1000 or the energy storage system described above. Therefore, the charging network 3000 has a better cooling effect.

[0148] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An energy storage device, characterized in that: include A battery device, wherein a heat exchange structure is provided on the battery device; and A thermal management module, comprising a liquid chiller and a connecting pipe, wherein the liquid chiller is connected to the heat exchange structure through the connecting pipe, and wherein the inner diameter of a portion of the connecting pipe is larger than the inner diameter of another portion of the connecting pipe.

2. The energy storage device according to claim 1, characterized in that: The connecting pipe includes a liquid-cooled pipe and a reducing pipe, which are connected in series. At least a portion of the reducing pipe has an inner diameter larger than that of the liquid-cooled pipe.

3. The energy storage device according to claim 2, characterized in that: Multiple of the aforementioned battery devices are stacked to form a battery assembly; The liquid cooling pipeline includes a first pipeline, a second pipeline, and a third pipeline. One end of the first pipeline is connected to the liquid cooling unit. One end of the second pipeline is connected to the first pipeline, and the other end of the second pipeline extends toward the battery assembly. One end of the third pipeline is connected to the second pipeline, and the other end of the third pipeline is connected to the heat exchange structure corresponding to the battery assembly. The variable diameter pipe is connected in series on the first pipe, and at least a portion of the variable diameter pipe has an inner diameter larger than that of the first pipe. And / or, the variable diameter pipe is connected in series on the second pipe, and at least a portion of the variable diameter pipe has an inner diameter greater than that of the second pipe. And / or, the variable diameter pipe is connected in series on the third pipe, and at least a portion of the variable diameter pipe has an inner diameter greater than that of the second pipe.

4. The energy storage device according to claim 3, characterized in that: The variable diameter pipe is connected in series on the second pipe, one end of the variable diameter pipe is connected to the first pipe or the second pipe, and the other end of the variable diameter pipe is connected to the second pipe or the third pipe.

5. The energy storage device according to claim 3, characterized in that: The energy storage device also includes a housing, in which a plurality of battery modules are disposed; in the height direction of the housing, the first pipeline is located below the battery modules and extends along the arrangement direction of the battery modules, and the second pipeline is evenly distributed around the periphery of each battery module, the second pipeline extending along the height direction of the housing and communicating with the first pipeline. The variable diameter pipe is connected in series on the second pipe and is located below the battery assembly.

6. The energy storage device according to claim 2 or 4, characterized in that: There are multiple variable diameter pipes, which are connected in series on the liquid cooling pipe.

7. The energy storage device according to claim 6, characterized in that: At least two adjacent variable diameter pipes are connected.

8. The energy storage device according to any one of claims 2 to 5, characterized in that: The variable diameter pipeline includes a main pipe section and connector pipe sections disposed at opposite ends of the main pipe section. The inner diameter of the main pipe section is larger than the inner diameter of the connector pipe sections and the inner diameter of the liquid cooling pipeline. The connector pipe sections are connected to the liquid cooling pipeline.

9. The energy storage device according to any one of claims 2 to 5, characterized in that: The reducing pipe includes a main pipe section, an expanding pipe section, and a connector pipe section. The two opposite ends of the main pipe section are connected to the connector pipe section through the expanding pipe section. The inner diameter of one end of the expanding pipe section is equal to the inner diameter of the main pipe section, and the inner diameter of the other end of the expanding pipe section is equal to the inner diameter of the connector pipe section. The inner diameter of the main pipe section is greater than the inner diameter of the connector pipe section and the inner diameter of the liquid cooling pipe. The connector pipe section is connected to the liquid cooling pipe.

10. The energy storage device according to any one of claims 2 to 5, characterized in that: The inner diameter of any section of the variable diameter pipe is larger than the inner diameter of the liquid cooling pipe, and the variable diameter pipe is connected to the liquid cooling pipe through a connecting joint.

11. The energy storage device according to any one of claims 2 to 5 and 7, characterized in that: At least a portion of the variable diameter pipeline is a flexible pipe section.

12. An energy storage system, characterized in that: It includes a power conversion device and an energy storage device as described in any one of claims 1 to 11, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

13. A charging network, characterized in that: It includes a charging pile and an energy storage device as described in any one of claims 1 to 11 or an energy storage system as described in claim 12, wherein the energy storage device is used to provide electrical energy to the charging pile.

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