Energy storage device, energy storage system and charging network

Abstract

The utility model relates to an energy storage device, an energy storage system and a charging network. The energy storage device comprises a box body; the conveying pipeline is arranged in the box body in a penetrating manner; the metal connecting piece is connected between the box body and the conveying pipeline; the metal connecting piece is provided with a plurality of folding parts which are sequentially connected in the axial direction of the conveying pipeline, and at least part of the folding parts are constructed to be capable of deforming in the axial direction of the conveying pipeline so that the conveying pipeline can move relative to the box body; the connecting piece is detachably connected with the box body, one end of the metal connecting piece is connected with the conveying pipeline, and the other end of the metal connecting piece is connected with the connecting piece. The metal connecting piece is connected between the box body and the conveying pipeline, the metal connecting piece is provided with the multiple folding parts, and flexible connection between the box body and the conveying pipeline can be achieved through the folding parts, so that the conveying pipeline can move relative to the box body, the manufacturing tolerance in the installation process is eliminated, and the connection sealing performance is improved.

Description

Technical Field

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

[0002] With the rapid development of technology, electricity has become an indispensable energy source in people's production and daily life. To improve the smoothness of electricity supply and ensure the normal operation of production and daily life, energy storage devices are needed. As devices that cyclically store and release electrical energy, energy storage devices store electrical energy or supply the stored energy to electrical devices through charging or discharging. Energy storage devices are widely used in industrial power supply, household power supply, temporary power supply, mobile power supply, wind power generation, solar power generation, and energy storage power stations.

[0003] In the structure of energy storage devices, pipelines are required to transport heat exchange media such as coolant. However, in current energy storage devices, misalignment and other deviations in pipeline connections are prone to occur, affecting the sealing performance of the connections. Utility Model Content

[0004] Therefore, it is necessary to provide an energy storage device, energy storage system, and charging network to address the problem that misalignment and other deviations in the connections of pipelines in current energy storage devices can easily affect the sealing performance of the connections.

[0005] In a first aspect, this application provides an energy storage device, including a housing, a transmission pipeline, a metal connector, and a connecting member. The transmission pipeline passes through the housing; the metal connector connects the housing and the transmission pipeline; the metal connector has multiple folded portions connected sequentially along the axial direction of the transmission pipeline, at least some of the folded portions being configured to deform along the axial direction of the transmission pipeline so that the transmission pipeline can move relative to the housing; the connecting member is detachably connected to the housing, one end of the metal connector is connected to the transmission pipeline, and the other end is connected to the connecting member.

[0006] Through the above structure, each fold can achieve a flexible connection between the box and the conveying pipeline, allowing the conveying pipeline to move relative to the box, eliminating manufacturing tolerances during the installation process, and improving the connection sealing performance.

[0007] In addition, by setting up connectors, a smooth connection between the conveying pipeline and the housing can be achieved, and the metal connectors can be stably and sealed between the conveying pipeline and the housing.

[0008] In some embodiments, the metal connector is arranged around the outer periphery of the delivery pipeline, and the outer diameters of each fold are equal.

[0009] With the above structure, not only is the manufacturing process of the metal connectors convenient and simple, but the metal connectors can also absorb the axial deviation of the conveying pipeline through each fold, so that the conveying pipeline can be installed on the box more smoothly and stably.

[0010] In some embodiments, the metal connector is arranged around the outer periphery of the delivery pipeline, and the outer diameter of each fold is different.

[0011] Therefore, through the above structure, each fold can simultaneously absorb the axial and radial deviations of the conveying pipeline, further improving the connection stability and sealing between the conveying pipeline and the housing.

[0012] In some embodiments, the outer diameter of each fold increases or decreases along the axial direction of the conveying pipeline. With this structure, each fold can simultaneously absorb axial and radial deviations in the conveying pipeline, further improving the connection stability and sealing between the conveying pipeline and the housing.

[0013] In some embodiments, the tensile strength of the metal connector ranges from 100 MPa to 1300 MPa. Therefore, setting the tensile strength of the metal connector within this range provides it with a degree of flexibility, enabling it to better absorb manufacturing tolerances between the conveying pipeline and the housing.

[0014] In some embodiments, the wall thickness of each folded portion ranges from 0.1 mm to 8 mm. By setting the wall thickness of each folded portion within this range, the pressure-bearing capacity and mobility of the metal connector can be effectively improved, allowing the metal connector to better absorb manufacturing tolerances between the conveying pipeline and the housing.

[0015] In some embodiments, the wall thickness of each fold portion ranges from 0.1 mm to 0.3 mm. Setting the wall thickness of each fold portion within the above range can further improve the pressure-bearing capacity and mobility of the metal connector.

[0016] In some embodiments, the pipeline includes a pipeline body and an insulation layer, wherein the interior of the pipeline body forms a transport channel for transporting the heat exchange medium, and the insulation layer is wrapped around the outer periphery of the pipeline body.

[0017] Therefore, the above structure can reduce the heat exchange between the heat exchange medium inside the conveying channel and the external environment, reduce the impact of the external environment on the heat exchange medium, and improve the heat exchange efficiency.

[0018] Secondly, this application also provides an energy storage system, including the energy storage device described above.

[0019] Thirdly, this application also provides a charging network including the energy storage device described above.

[0020] The aforementioned energy storage device, energy storage system, and charging network are connected between the housing and the delivery pipeline via metal connectors. The metal connectors have multiple folds, which enable a flexible connection between the housing and the delivery pipeline, allowing the delivery pipeline to move relative to the housing, eliminating manufacturing tolerances during installation, and improving connection sealing performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an energy storage system according to one or more embodiments.

[0022] Figure 2 This is a schematic diagram of the structure of an energy storage submodule according to one or more embodiments.

[0023] Figure 3 This is a schematic diagram of the assembly structure of the housing and delivery pipeline in an energy storage device according to one or more embodiments.

[0024] Figure 4 This is an assembly cross-sectional view of the housing and delivery pipeline in an energy storage device according to one or more embodiments.

[0025] Figure 5 This is a schematic diagram of the assembly structure of the housing and delivery pipeline in an energy storage device according to one or more embodiments.

[0026] Figure 6 This is an assembly cross-sectional view of the housing and delivery pipeline in an energy storage device according to one or more embodiments.

[0027] Explanation of reference numerals in the attached drawings: 101, monitoring backend; 102, system controller; 103, energy storage submodule; 104, battery management controller; 105, submodule controller; 10, energy storage device; 11, enclosure; 12, conveying pipeline; 13, metal connector; 14, connector; 121, pipeline body; 122, insulation layer; 123, conveying channel; 131, folding section. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms 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.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are 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 with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0035] Energy storage devices typically include a housing, a thermal management module, connecting pipes, and a battery unit. Both the battery unit and the thermal management module are housed within the housing. The connecting pipes connect the battery unit and the thermal management module to facilitate the exchange of coolant between the thermal management module and the battery unit, allowing the thermal management module to regulate the temperature of the battery unit.

[0036] The battery device can be a battery module, or when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. The battery device can also be a battery pack, which includes a housing and battery cells, with the battery cells or battery modules housed in the housing.

[0037] Energy storage devices are used in energy storage systems, specifically, such as Figure 1 As shown, the energy storage system includes a monitoring backend 101, a system controller 102 (Valve Base Controller, VBC), multiple energy storage sub-modules 103, a battery management controller 104 (BMC) and a sub-module controller 105 (SMC) corresponding to each energy storage sub-module 103 (Sub-Module, SM). The battery management controller 104 and the sub-module controller 105 are connected in a one-to-one communication manner. The monitoring backend 101 is connected to the system controller 102 and each battery management controller 104, and the system controller 102 is also connected to each sub-module controller 105. The battery management controller 104 is used to obtain the status information of the corresponding energy storage sub-module 103. The sub-module controller 105 is used to control the corresponding energy storage sub-module 103. The monitoring backend 101 is used for status monitoring. The system controller 102 is used to obtain the communication status of each communication path in the energy storage system and execute corresponding processing actions according to the communication status.

[0038] In this embodiment of the application, the energy storage system includes multiple energy storage submodules 103. Each energy storage submodule 103 can be composed of multiple electrical cabinets connected in series and / or in parallel. Each electrical cabinet can be composed of multiple electrical boxes connected in series and / or in parallel. Each electrical box can be composed of multiple batteries connected in series and / or in parallel. Figure 2 As shown.

[0039] The energy storage system also includes a battery management controller 104 corresponding to the energy storage submodule 103. The battery management controller 104 can collect the status information of the corresponding energy storage submodule 103 and is responsible for detecting the battery's status, performance, and health status. The aforementioned status information may include voltage, current, temperature, state of charge / discharge, state of charge (SOC), state of health (SOH), etc.

[0040] The energy storage system also includes submodule controllers 105 that are communicatively connected to the battery management controller 104. The battery management controller 104 can transmit the collected status information to the submodule controllers 105, and the submodule controllers 105 can also transmit control commands to the battery management controller 104, thereby controlling the corresponding energy storage submodules 103. For example, controlling the energy storage submodules 103 to enter or leave the energy storage system, and also controlling the charging and discharging of the energy storage submodules 103.

[0041] The energy storage system also includes a system controller 102 and a monitoring backend 101. The system controller 102 is communicatively connected to multiple submodule controllers 105 and the monitoring backend 101, respectively. The monitoring backend 101 is also communicatively connected to multiple battery management controllers 104. The system controller 102 can obtain status information collected by the battery management controllers 104 through the submodule controllers 105 and transmit the status information to the monitoring backend 101. The system controller 102 can also obtain status information collected by the battery management controllers 104 through the monitoring backend 101. The system controller 102 can send control commands to the submodule controllers 105 based on the status information, thereby controlling each energy storage submodule 103. The system controller 102 can determine the communication status of each communication path and take corresponding actions when a communication failure occurs. The monitoring backend 101 can monitor the status of the system controller 102 through communication with the system controller 102, and can also monitor the status of the battery management controllers 104 through communication with them. The monitoring backend 101 is mainly used for monitoring status. In some embodiments, the monitoring backend 101 and the system controller 102 can be integrated as two components into a single hardware device.

[0042] It should be noted that during the operation of energy storage devices, the battery unit generates heat. Therefore, a pipeline structure is required to deliver heat exchange media such as coolant to the battery unit. However, both the pipeline structure and the casing have certain manufacturing tolerances. This can easily lead to misalignment of the connection positions when the pipeline and the casing are connected, affecting the sealing performance of the connection.

[0043] Based on the above considerations, in order to solve the problem that misalignment and other deviations are prone to occur in the connection of pipelines in current energy storage devices, affecting the connection sealing performance, one or more embodiments of this application provide an energy storage device that is connected between the housing and the delivery pipeline by a metal connector. The metal connector has multiple folds, and each fold can realize a flexible connection between the housing and the delivery pipeline, allowing the delivery pipeline to move relative to the housing, eliminating manufacturing tolerances during the installation process, and improving the connection sealing performance.

[0044] See Figure 3 and Figure 4 One embodiment of this application provides an energy storage device 10, including a housing 11, a delivery pipeline 12, and a metal connector 13. The housing 11 has a housing wall, and the delivery pipeline 12 passes through the housing wall and is used to deliver a heat exchange medium into the housing 11. The metal connector 13 connects the housing wall of the housing 11 and the delivery pipeline 12. The metal connector 13 has a plurality of folds 131 connected sequentially along the axial direction of the delivery pipeline 12. At least some of the folds 131 are configured to deform along the axial direction of the delivery pipeline 12 so that the delivery pipeline 12 can move relative to the housing 11.

[0045] It should be noted that the energy storage device 10 can be applied to a charging network, which typically includes charging piles. The charging piles can be used to charge electrical equipment, and the energy storage device 10 is electrically connected to the charging piles to provide power to them.

[0046] Specifically, the charging pile and the battery device in the energy storage device 10 are electrically connected via a cable, and the battery device can supply the electrical energy it stores to the charging pile. In a charging network, there can be one, two, or more charging piles.

[0047] The energy storage device 10 typically includes a housing 11 and a battery pack housed within the housing 11. The housing 11 provides a space for the battery pack and offers some protection. Understandably, the energy storage device 10 may also include electrical components and a thermal management module to achieve the storage and transmission of electrical energy.

[0048] Furthermore, the battery device generates a certain amount of heat during operation, and if the internal temperature of the housing 11 is too high or too low, it will affect the performance of the battery device.

[0049] Therefore, it is usually necessary to set up a delivery pipeline 12 to deliver heat exchange medium such as coolant into the housing 11 to exchange heat with the battery device and keep the battery device in a suitable temperature range to improve its performance.

[0050] One end of the delivery pipeline 12 is located outside the housing 11 and is connected to an external rigid pipeline to form a closed heat exchange medium loop. The other end of the delivery pipeline 12 passes through the housing wall and is connected to the battery device to deliver the heat exchange medium to a designated location in the battery device, thereby realizing heat exchange in the battery device.

[0051] Under these conditions, this application provides a metal connector 13, which connects the container wall and the conveying pipeline 12. The metal connector 13 has multiple folds 131, which are sequentially connected along the axial direction of the conveying pipeline 12 and are deformable along the axial direction of the pipeline 12. In this way, each fold 131 provides a certain amount of movement space for the conveying pipeline 12, allowing it to move relative to the container wall. This eliminates manufacturing tolerances during installation, enabling a faster and more stable connection between the conveying pipeline 12 and the container wall, and improving the sealing performance.

[0052] Thus, through the above structure, each fold 131 can achieve a flexible connection between the box wall and the conveying pipeline 12, allowing the conveying pipeline 12 to move relative to the box wall, eliminating manufacturing tolerances during the installation process, and improving the connection sealing performance.

[0053] In some embodiments, the metal connector 13 is arranged around the outer periphery of the delivery pipeline 12, and the outer diameter of each fold 131 is equal.

[0054] Specifically, the metal connector 13 is arranged around the circumference of the conveying pipeline 12, thereby better absorbing the manufacturing tolerances between the conveying pipeline 12 and the box wall.

[0055] Furthermore, the outer diameters of each fold 131 are equal, meaning that the radial dimensions of each fold 131 in the conveying pipe 12 are all equal. During the manufacturing process, the metal connector 13 can be formed by welding thin metal sheets, such as stainless steel sheets, into a tube, and then extruding it through a mold to form a regular corrugated structure, thus creating each fold 131.

[0056] With the above structure, not only is the manufacturing process of the metal connector 13 convenient and simple, but the metal connector 13 can also absorb the axial deviation of the conveying pipeline 12 through each fold 131, so that the conveying pipeline 12 can be installed on the box wall more smoothly and stably.

[0057] like Figure 5 and Figure 6 As shown, in some embodiments, the metal connector 13 is arranged around the outer periphery of the delivery pipeline 12, and the outer diameter of each fold 131 is different.

[0058] Specifically, each fold 131 can also be configured with a different outer diameter. That is, the radial dimensions of each fold 131 in the conveying pipe 12 are not equal. In this way, each fold 131 can absorb not only the axial deviation of the conveying pipe 12, but also the radial deviation of the conveying pipe 12.

[0059] Thus, through the above structure, each fold 131 can simultaneously absorb the axial and radial deviations of the conveying pipeline 12, further improving the connection stability and sealing between the conveying pipeline 12 and the housing 11.

[0060] In some embodiments, the outer diameter of each fold 131 increases or decreases along the axial direction of the delivery conduit 12.

[0061] Specifically, along the axial direction of the conveying pipeline 12, the outer diameter of each fold 131 can be set to increase or decrease. That is, the outer diameter of each fold 131 can gradually decrease from the end connected to the box wall to the end connected to the conveying pipeline 12, or it can gradually increase from the end connected to the box wall to the end connected to the conveying pipeline 12.

[0062] Of course, in some other embodiments, the outer diameter of each fold 131 can be increased first and then decreased, or decreased first and then increased, both of which can achieve the purpose of simultaneously absorbing the axial and radial deviations of the conveying pipeline 12, which will not be elaborated here.

[0063] Furthermore, the aforementioned structure can be fabricated by welding multiple metal sheets together to form a sealed body.

[0064] With the above structure, each fold 131 can simultaneously absorb the axial and radial deviations of the conveying pipeline 12, further improving the connection stability and sealing between the conveying pipeline 12 and the housing 11.

[0065] In some embodiments, the tensile strength of the metal connector 13 ranges from 100 MPa to 1300 MPa.

[0066] Specifically, the metal connector 13 has a certain degree of flexibility. As a specific embodiment, the metal connector 13 can be, but is not limited to, made of aluminum, stainless steel, carbon steel, copper, or other metal materials. Among them, the tensile strength of steel is typically 400MPa~1300MPa, the tensile strength of aluminum alloy is typically 100MPa~600MPa, and the tensile strength of copper is typically 100MPa~600MPa.

[0067] Therefore, the tensile strength of the metal connector 13 is set within the above range, so that the metal connector 13 has a certain degree of flexibility and can better absorb the manufacturing tolerance between the conveying pipeline 12 and the housing 11.

[0068] In some embodiments, the wall thickness of each fold 131 ranges from 0.1 mm to 8 mm.

[0069] Specifically, the wall thickness of each fold 131 refers to the thickness of the metal sheet before it is formed into the metal connector 13. The wall thickness of each fold 131 will affect the pressure-bearing capacity and mobility of the metal connector 13.

[0070] As a specific embodiment, the wall thickness of each fold 131 can be, but is not limited to, 0.1mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, or 8mm.

[0071] By setting the wall thickness of each fold 131 within the aforementioned range, the pressure-bearing capacity and mobility of the metal connector 13 can be effectively improved, enabling the metal connector 13 to better absorb the manufacturing tolerances between the conveying pipeline 12 and the housing 11.

[0072] In some embodiments, the wall thickness of each fold 131 ranges from 0.1 mm to 0.3 mm.

[0073] As a specific embodiment, the wall thickness of each fold 131 can be, but is not limited to, 0.1mm, 0.2mm, or 0.3mm. Setting the wall thickness of each fold 131 within the above range can further improve the pressure-bearing capacity and mobility of the metal connector 13.

[0074] In some embodiments, the conveying pipeline 12 includes a pipeline body 121 and an insulation layer 122. The pipeline body 121 has a conveying channel 123 for conveying heat exchange medium inside, and the insulation layer 122 is wrapped around the outer periphery of the pipeline body 121.

[0075] Specifically, the interior of the pipeline body 121 is hollow to form a transport channel 123 for transporting the heat exchange medium.

[0076] Furthermore, the insulation layer 122 is wrapped around the outer periphery of the pipeline body 121. In this way, the insulation layer 122 can effectively reduce the heat exchange between the environment and the coolant in the delivery channel 123, thereby reducing condensation.

[0077] Therefore, the above structure can reduce the heat exchange between the heat exchange medium inside the conveying channel 123 and the external environment, reduce the impact of the external environment on the heat exchange medium, and improve the heat exchange efficiency.

[0078] In some embodiments, the energy storage device 10 further includes a connector 14, which is detachably connected to the tank wall. One end of the metal connector 13 is connected to the delivery pipeline 12, and the other end is connected to the connector 14.

[0079] Specifically, the connector 14 can be, but is not limited to, a sheet metal part. The sheet metal part is first detachably connected to the box wall by bolts or other structures. Then, one end of the metal connector 13 is connected to the conveying pipeline 12, and the other end is connected to the sheet metal part, thus realizing the connection between the conveying pipeline 12 and the box wall.

[0080] The above structure enables a smooth connection between the conveying pipeline 12 and the box wall, and ensures that the metal connector 13 is stably and sealed between the conveying pipeline 12 and the box wall.

[0081] Based on the same concept as the energy storage device 10 described above, this application also provides an energy storage system, including the energy storage device 10 as described above.

[0082] Based on the same concept as the energy storage device 10 described above, this application also provides a charging network including the energy storage device 10 as described above.

[0083] According to one or more embodiments, in specific use, a through hole is first made in the wall of the housing 11. The connector 14 is fixed to the housing wall with screws and surrounds the outside of the through hole. Then, the delivery pipe 12 is passed through the through hole, so that one end of the delivery pipe 12 extends into the interior of the housing 11 and is connected to a designated position of the battery device. The other end of the delivery pipe 12 is connected to an external rigid pipe to form a closed coolant circuit to deliver coolant to the battery device.

[0084] One end of the metal connector 13 is connected to the connector 14, and the other end is connected to the conveying pipeline 12. At this time, the metal connector 13 can absorb the axial and / or radial deviation of the conveying pipeline 12, eliminate the manufacturing tolerance during the installation process, and enable the conveying pipeline 12 to move relative to the box wall, thereby improving the connection stability and sealing performance between the conveying pipeline 12 and the box 11.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An energy storage device, characterized by, include: Box; The delivery pipeline passes through the box body; A metal connector is provided between the housing and the conveying pipeline; the metal connector has a plurality of folds connected sequentially along the axial direction of the conveying pipeline, at least some of the folds being configured to deform along the axial direction of the conveying pipeline so that the conveying pipeline can move relative to the housing; and A connector is detachably connected to the housing. One end of the metal connector is connected to the conveying pipeline, and the other end is connected to the connector.

2. The energy storage device of claim 1, wherein, The metal connector is wound around the outer periphery of the conveying pipeline, and the outer diameter of each of the folded portions is equal.

3. The energy storage device of claim 1, wherein, The metal connector is wound around the outer periphery of the conveying pipeline, and the outer diameter of each of the folded portions is different.

4. The energy storage device of claim 3, wherein, Along the axial direction of the conveying pipeline, the outer diameter of each of the folded portions increases or decreases.

5. The energy storage device of any one of claims 1-4, wherein, The tensile strength of the metal connector ranges from 100MPa to 1300MPa.

6. The energy storage device of any one of claims 1-4, wherein, The wall thickness of each folded part ranges from 0.1 mm to 8 mm.

7. The energy storage device of claim 6, wherein, The wall thickness of each of the folded parts ranges from 0.1 mm to 0.3 mm.

8. The energy storage device of any one of claims 1-4, wherein, The conveying pipeline includes a pipeline body and an insulation layer. The interior of the pipeline body forms a conveying channel for conveying the heat exchange medium, and the insulation layer wraps around the outer periphery of the pipeline body.

9. An energy storage system characterized by, Includes the energy storage device as described in any one of claims 1-8.

10. A charging network characterized in that, Includes the energy storage device as described in any one of claims 1-8.

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