Energy storage device, energy storage system and charging network

Abstract

The utility model relates to the technical field of energy storage devices, and discloses an energy storage device, an energy storage system and a charging network. The battery device is arranged in the energy storage box, the battery device comprises a battery unit, a heat conduction structure and a heat exchange structure, the battery unit comprises at least one battery monomer, a medium accommodating cavity is formed in the heat conduction structure, the medium accommodating cavity is configured to accommodate a phase change medium, and the heat conduction structure is matched with the battery unit and the heat exchange structure in a heat exchange manner; and the heat dissipation structure is arranged outside the energy storage box, and the heat dissipation structure communicates with the heat exchange structure to form a circulating flow path of the heat exchange medium. Therefore, through cooperation of the heat conduction structure, the heat exchange structure and the heat dissipation structure, compared with the prior art, reduction of heat dissipation energy consumption, reduction of the failure rate of the energy storage device, reduction of the maintenance cost of the energy storage device and reduction of the manufacturing cost of the energy storage device are facilitated, and therefore the economic benefits of the energy storage device can be 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] In related technologies, energy storage devices are equipped with thermal management mechanisms to remove heat from the individual battery cells, maintaining their temperature at a suitable level. However, existing thermal management mechanisms, including water-cooled units, rely on components such as fans, condensers, and compressors, increasing the failure rate of the energy storage device. Furthermore, the thermal management mechanism consumes a large amount of electricity during operation, resulting in high energy consumption for heat dissipation and impacting the economic efficiency of the energy storage device. Additionally, components such as fans and compressors require regular replacement and maintenance, leading to high maintenance costs. Moreover, the high cost of water-cooled units contributes to the high manufacturing cost of the energy storage device. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide an energy storage device that reduces heat dissipation energy consumption, lowers the failure rate of the energy storage device, reduces maintenance costs, and lowers manufacturing costs, thereby improving the economic efficiency of the energy storage device.

[0004] This application also proposes an energy storage system.

[0005] This application also proposes a charging network.

[0006] In a first aspect, embodiments of this application provide an energy storage device, comprising:

[0007] Energy storage box;

[0008] The battery device is located inside the energy storage box. The battery device includes a battery cell, a heat-conducting structure and a heat-exchange structure. The battery cell includes at least one battery cell. A medium-containing cavity is formed in the heat-conducting structure. The medium-containing cavity is configured to contain a phase change medium. The heat-conducting structure is in heat-exchange cooperation with the battery cell and the heat-exchange structure.

[0009] The heat dissipation structure is located outside the energy storage tank. The heat dissipation structure and the heat exchange structure are connected to form a circulation path for the heat exchange medium.

[0010] In the above technical solution, through the cooperation of a heat-conducting structure, a heat-exchange structure, and a heat-dissipating structure, the heat-conducting structure can transfer the heat of the battery cells to the heat-exchange structure. The heat exchange medium circulates within the circulation path, transferring the heat from the heat-exchange structure to the heat-dissipating structure. The energy storage device of this application does not require water-cooling units or other components, and does not rely on fans, condensers, compressors, or other components for heat dissipation. Compared with existing technologies, this application eliminates the need for water-cooling units, simplifies the heat dissipation structure for battery cells, and reduces the number of components in the heat dissipation structure. This helps reduce the failure rate of the energy storage device, lowers its manufacturing cost, and reduces the power consumption required for heat dissipation, thus reducing energy consumption. Furthermore, the reduced number of components requiring regular replacement and maintenance helps reduce the operation and maintenance costs throughout the energy storage device's lifespan, thereby improving its economic efficiency.

[0011] In some embodiments, the heat-conducting structure includes: a first heat-conducting part and a second heat-conducting part that are bent and connected together, the first heat-conducting part and the corresponding battery cell are in heat exchange cooperation, the second heat-conducting part and the corresponding heat exchange structure are in heat exchange cooperation, the second heat-conducting part is located above the first heat-conducting part in the vertical direction, and the medium receiving cavity includes a first receiving cavity and a second receiving cavity that are connected, the first receiving cavity is formed in the first heat-conducting part, and the second receiving cavity is formed in the second heat-conducting part.

[0012] In the above technical solution, by setting the first heat-conducting part and the second heat-conducting part, different areas of the heat-conducting structure can be respectively matched with the corresponding battery cell and the corresponding heat exchange structure for heat exchange. The heat of the battery cell can be quickly transferred to the heat exchange structure. Furthermore, since the gaseous phase change medium flows upward, and the second heat-conducting part is set above the first heat-conducting part, the liquid phase change medium is heated and turns into a gaseous phase change medium, which facilitates the flow of the gaseous phase change medium into the second receiving cavity. This facilitates the transfer of heat to the second heat-conducting part, thereby achieving the effect of heat transfer to the heat exchange structure through the second heat-conducting part. This makes the structure of the heat-conducting structure reasonable. At the same time, since the liquid phase change medium flows downward under the action of gravity, and the second heat-conducting part is set above the first heat-conducting part, when the gaseous phase change medium in the second receiving cavity condenses and releases heat to become a liquid phase change medium, it is convenient for the liquid phase change medium in the second receiving cavity to flow back into the first receiving cavity. This facilitates the effect of the phase change medium circulating in the first and second receiving cavities.

[0013] In some embodiments, there are multiple second heat-conducting parts and multiple heat exchange structures, and the multiple second heat-conducting parts are respectively heat-exchange cooperative with multiple heat exchange structures.

[0014] In the above technical solution, by setting multiple second heat-conducting parts and multiple heat exchange structures, the multiple second heat-conducting parts can simultaneously exchange heat with multiple heat exchange structures, which can increase the heat exchange area between the heat-conducting structure and the heat exchange structure, which is conducive to improving the heat transfer efficiency between the heat-conducting structure and the heat exchange structure, and thus more conducive to the heat dissipation and cooling of the battery cell.

[0015] In some embodiments, there are two second heat-conducting parts, which are opposite to and spaced apart along a first direction of the battery device. A first heat-conducting part is connected between the two second heat-conducting parts. In the vertical direction, the battery cell is located above the first heat-conducting part and between the two second heat-conducting parts. The first direction is perpendicular to the vertical direction.

[0016] In the above technical solution, by setting two second heat-conducting parts, the two second heat-conducting parts of the same heat-conducting structure can simultaneously cooperate with the corresponding heat exchange structure for heat exchange, which is beneficial to increase the heat exchange area of ​​the heat-conducting structure and the heat exchange structure, thereby improving the heat transfer efficiency between the heat-conducting structure and the heat exchange structure. Furthermore, the battery cell is located above the first heat-conducting part and between the two second heat-conducting parts. Compared with the battery cell being located below the first heat-conducting part, this is beneficial to improve the structural compactness of the battery device and reduce the volume of the battery device, thereby facilitating the miniaturization design of the battery device and, consequently, the miniaturization design of the energy storage device.

[0017] In some embodiments, there are two heat exchange structures, and each second heat-conducting part is provided with a heat exchange structure on the side opposite to the battery cell along the first direction.

[0018] In the above technical solution, by providing a heat exchange structure on the side of each second heat-conducting part away from the battery cell, the relative positions of the second heat-conducting part and the heat exchange structure are reasonably set, which facilitates the heat exchange cooperation between the second heat-conducting part and the corresponding heat exchange structure, thereby facilitating the production and manufacturing of the battery device, reducing the manufacturing difficulty of the heat exchange structure, and thus improving the production efficiency of the battery device.

[0019] In some embodiments, the battery device further includes: a base plate, which is located below the battery cell and heat-exchanges with the battery cell in a vertical direction, and a first heat-conducting part is located between the base plate and the battery cell and heat-exchanges with the base plate.

[0020] In the above technical solution, by setting a bottom support plate, the bottom support plate, as a load-bearing component, can be fixed on the battery rack inside the energy storage box. The bottom support plate can reliably support the battery unit, so that the battery unit is stably assembled inside the energy storage box. Furthermore, the bottom support plate cooperates with the battery cell and the first heat-conducting part for heat exchange. The bottom support plate acts as a temperature equalization plate, which is conducive to improving the temperature uniformity of multiple battery cells in the battery unit and reducing the temperature difference between multiple battery cells in the battery unit, thereby reducing the risk of local overheating of the battery device.

[0021] In some embodiments, a mounting groove is formed on the side of the base plate facing the battery cell, and at least a portion of the first heat-conducting part is mounted in the mounting groove.

[0022] In the above technical solution, by assembling the first heat-conducting part into the assembly groove of the bottom support plate, the first heat-conducting part can be embedded in the bottom support plate. The side wall of the assembly groove can limit the heat-conducting structure, which is conducive to improving the positional stability of the heat-conducting structure and reducing the risk of displacement of the heat-conducting structure relative to the corresponding battery cell and the corresponding heat exchange structure. This is conducive to improving the heat exchange reliability between the heat-conducting structure and the corresponding battery cell and the corresponding heat exchange structure. Furthermore, it is conducive to increasing the heat exchange area between the first heat-conducting part and the bottom support plate, and improving the heat transfer efficiency between the first heat-conducting part and the bottom support plate per unit time.

[0023] In some embodiments, the second heat-conducting part is formed with a medium injection port, which is in communication with the medium receiving cavity.

[0024] In the above technical solution, a medium injection port is formed through the second heat-conducting part, which can inject the phase change medium into the medium receiving cavity, thereby achieving the effect of assembling the phase change medium into the medium receiving cavity.

[0025] In some embodiments, the energy storage device further includes: heat dissipation fins, which are disposed on the heat dissipation structure.

[0026] In the above technical solution, heat dissipation fins are installed on the heat dissipation structure, and the heat on the heat dissipation structure can be transferred to the heat dissipation fins. The natural wind outside the energy storage device dissipates the heat on the heat dissipation fins and the heat dissipation structure to the external environment of the energy storage device, which is conducive to improving the heat dissipation efficiency of the energy storage device. There is no need to set up a blower or other air supply structure to blow air to the heat dissipation fins and the heat dissipation structure to achieve heat dissipation of the energy storage device, which is more conducive to reducing heat dissipation energy consumption.

[0027] In some embodiments, at least one of the outer surface of the heat dissipation structure and the outer surface of the heat dissipation fins is provided with a heat dissipation layer.

[0028] In the above technical solution, by setting a heat dissipation layer, the heat on the heat dissipation fins can be dissipated quickly, which is more conducive to improving the heat dissipation efficiency of the heat dissipation fins.

[0029] In some embodiments, the battery cells and the first heat-conducting part are arranged in a vertical direction. The first heat-conducting part includes a heat conductor. The heat conductor and the corresponding battery cell are vertically aligned. The heat conductor includes a first heat-conducting segment and a second heat-conducting segment arranged and connected along a first direction of the battery device. The end face of the battery cell facing the corresponding heat conductor has a central heat exchange region and an edge heat exchange region arranged along the first direction. At least a portion of the first heat-conducting segment corresponds to the central heat exchange region, and at least a portion of the second heat-conducting segment corresponds to the edge heat exchange region. Along a second direction of the battery device, the width of the first heat-conducting segment is greater than the width of the second heat-conducting segment. The first direction, the second direction, and the vertical direction are perpendicular to each other.

[0030] In the above technical solution, by setting the width of the first heat-conducting section to be greater than that of the second heat-conducting section along the second direction of the battery device, the first heat-conducting section and the second heat-conducting section can be matched to different heat-generating areas of the battery cell, which is beneficial to improving the temperature uniformity of different areas of the battery cell, thereby reducing the risk of overheating in local positions of the battery cell and extending the service life of the battery cell.

[0031] In some embodiments, the first heat-conducting part includes a plurality of heat conductors, which are arranged sequentially along a first direction, and the plurality of heat conductors are respectively in heat exchange cooperation with the corresponding battery cells.

[0032] In the above technical solution, by setting the first heat-conducting part to include multiple heat conductors, and the multiple heat conductors of the first heat-conducting part are arranged sequentially along the first direction of the battery device, the multiple heat conductors of the first heat-conducting part can be matched with the multiple battery cells corresponding to the first heat-conducting part, so that each battery cell has a corresponding heat conductor for heat conduction, thereby improving the temperature uniformity of the multiple battery cells of the battery unit.

[0033] In some embodiments, there are multiple heat-conducting structures, which are arranged sequentially along the second direction. The battery cell includes multiple rows of battery bars, which are arranged sequentially along the second direction. Each row of battery bars corresponds to one of the multiple heat-conducting structures.

[0034] In the above technical solution, by setting multiple heat-conducting structures, with multiple rows of battery cells and multiple heat-conducting structures arranged one-to-one in the vertical direction, each row of battery cells can have a corresponding heat-conducting structure for heat conduction. The heat of the battery cells can be transferred to the heat exchange structure through the corresponding heat-conducting structure, which is more conducive to improving the temperature uniformity of multiple battery cells in the battery unit.

[0035] In some embodiments, the energy storage device further includes a drive pump, which is disposed on the communication path between the heat dissipation structure and the heat exchange structure, and is used to drive the heat exchange medium to circulate within the circulation path.

[0036] In the above technical solution, by setting up a drive pump, when the drive pump is turned on, the liquid heat exchange medium circulates between the heat dissipation structure and multiple heat exchange structures, so that the heat generated by the battery cell is quickly transferred to the heat dissipation structure, thereby continuously transferring heat to the heat dissipation structure, which is conducive to improving the heat dissipation efficiency of the energy storage device and extending the service life of the energy storage device.

[0037] In some embodiments, the drive pump is configured to drive the heat exchange medium to circulate within the circulation path when the average temperature of the battery cells in the energy storage device is greater than the ambient temperature.

[0038] In the above technical solution, the drive pump is configured to drive the heat exchange medium to circulate in the circulation path when the average temperature of the battery cells in the energy storage device is higher than the ambient temperature. When the energy storage device requires lower heat dissipation efficiency, the drive pump can be turned off to meet the heat dissipation requirements of the energy storage device. At this time, the drive pump does not consume electrical energy, which is more conducive to reducing heat dissipation energy consumption. In addition, the drive pump does not work in real time, which is conducive to extending the service life of the drive pump. When the energy storage device requires higher heat dissipation efficiency, the drive pump is turned on to meet the heat dissipation requirements of the energy storage device.

[0039] In some embodiments, the battery cell is a sodium-ion battery cell.

[0040] In the above technical solution, the battery cell is a sodium-ion battery cell. Sodium-ion battery cells have good discharge retention rate at low temperatures. Moreover, compared with lithium-ion battery cells, sodium-ion battery cells are less prone to thermal runaway in high-temperature environments. At the same time, it can reduce dependence on scarce resources such as lithium and cobalt, which is conducive to reducing the long-term manufacturing cost of energy storage devices and also conducive to the sustainable production of energy storage devices.

[0041] Secondly, embodiments of this application also provide an energy storage system, including an energy conversion system and the aforementioned energy storage device, wherein the energy conversion system and the energy storage device are connected to perform energy conversion on current input to the energy storage device or output from the energy storage device.

[0042] Thirdly, embodiments of this application also provide a charging network, including:

[0043] Charging stations;

[0044] The aforementioned energy storage device or energy storage system is used to provide electrical energy to the charging pile.

[0045] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0046] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0047] Figure 1 This is a connection block diagram of the energy storage device, charging pile, and connector according to embodiments of this application;

[0048] Figure 2 This is a connection block diagram of the energy storage device, energy conversion system, and power generation equipment according to embodiments of this application;

[0049] Figure 3 This is a schematic diagram of the internal structure of an energy storage device according to an embodiment of this application;

[0050] Figure 4 This is an assembly diagram of the battery device, heat dissipation structure, and heat dissipation fins according to embodiments of this application;

[0051] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0052] Figure 6 This is a schematic diagram showing the connection between the heat exchange structure and the drive pump according to an embodiment of this application;

[0053] Figure 7 This is a side view of a battery device according to an embodiment of this application;

[0054] Figure 8 This is a front view of a battery device according to an embodiment of this application;

[0055] Figure 9 This is an assembly diagram of a battery cell and multiple heat-conducting structures according to an embodiment of this application;

[0056] Figure 10 This is an assembly diagram of the base plate and multiple heat-conducting structures according to an embodiment of this application;

[0057] Figure 11 This is a schematic diagram of the cooperation between the first heat-conducting part and the battery cell according to an embodiment of this application;

[0058] Figure 12 This is a bottom view of a battery cell according to an embodiment of this application;

[0059] Figure 13 This is a schematic diagram of a battery cell according to an embodiment of this application.

[0060] Figure label:

[0061] Energy storage device 100;

[0062] Energy storage box 10;

[0063] Battery device 20;

[0064] Battery cell 21;

[0065] Battery cell 211; central heat exchange zone 2111; edge heat exchange zone 2112; outer casing 2113;

[0066] Thermally conductive structure 22;

[0067] First heat-conducting part 221; heat conductor 2211; first heat-conducting section 2212; second heat-conducting section 2213;

[0068] Second heat-conducting part 222; Medium injection port 224;

[0069] Medium receiving cavity 223; first receiving cavity 2231; second receiving cavity 2232;

[0070] Heat exchange structure 23; First inlet 231; First outlet 232;

[0071] Base plate 24; Assembly slot 241;

[0072] Heat dissipation structure 30; second flow channel 31; first sub-flow channel 311; second sub-flow channel 312;

[0073] Heat dissipation fins 40;

[0074] Drive pump 50; First connecting pipe 60; Second connecting pipe 70;

[0075] Energy conversion system 201; power generation equipment 202;

[0076] Charging pile 300; connector 301. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0079] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0080] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0081] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, R and / or S can represent: R existing alone, R and S existing simultaneously, or S existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0082] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0083] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0084] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0085] In this application, "multiple" means two or more (including two).

[0086] The battery device mentioned in the embodiments of this application may include multiple battery cells, which are connected in series, parallel or mixed connection through a busbar component.

[0087] 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.

[0088] 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.

[0089] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0090] A battery cell includes a casing, electrode assembly, and electrolyte. The casing houses the electrode assembly and electrolyte. The electrode assembly consists of an anode electrode, a cathode electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the anode and cathode electrodes. The anode electrode includes an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The uncoated anode current collector protrudes beyond the coated anode current collector and serves as the anode tab. Taking a lithium-ion battery as an example, the anode current collector can be made of aluminum, and the anode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The cathode electrode includes a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The uncoated cathode current collector protrudes beyond the coated cathode current collector and serves as the cathode tab. The cathode current collector can be made of copper, and the cathode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple anode tabs stacked together, and there are multiple cathode tabs stacked together.

[0091] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0092] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0093] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0094] 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.

[0095] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0096] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0097] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0098] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0099] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0100] In this embodiment, the energy storage device may include one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0101] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device 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 energy storage devices.

[0102] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0103] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0104] In some embodiments, the energy storage device 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.

[0105] 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.

[0106] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet module, and a fiber optic conversion module.

[0107] 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.

[0108] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0109] In recent years, energy storage devices have developed rapidly, playing an irreplaceable and important role in charging electrical devices.

[0110] In related technologies, energy storage devices are equipped with thermal management mechanisms to remove heat from the individual battery cells, maintaining their temperature at a suitable level. However, existing thermal management mechanisms, including water-cooled units, rely on components such as fans, condensers, and compressors, increasing the failure rate of the energy storage device. Furthermore, the thermal management mechanism consumes a large amount of electricity during operation, resulting in high energy consumption for heat dissipation and impacting the economic efficiency of the energy storage device. Additionally, components such as fans and compressors require regular replacement and maintenance, leading to high maintenance costs. Moreover, the high cost of water-cooled units contributes to the high manufacturing cost of the energy storage device.

[0111] Based on the above considerations, and to address the problems of high failure rate, high heat dissipation energy consumption, high maintenance cost, and high manufacturing cost of existing energy storage devices, an energy storage device has been designed after in-depth research. The device includes: an energy storage box; a battery unit housed within the energy storage box, comprising battery cells, a heat-conducting structure, and a heat-exchange structure. Each battery cell includes at least one individual battery cell. The heat-conducting structure contains a medium-containing cavity configured to house a phase-change medium. The heat-conducting structure is in heat exchange cooperation with both the battery cells and the heat-exchange structure; and a heat dissipation structure located outside the energy storage box. The heat dissipation structure and the heat-exchange structure are connected to form a circulation path for the heat exchange medium. Through the coordinated use of the heat-conducting, heat-exchange, and heat dissipation structures, compared to existing technologies, this design reduces heat dissipation energy consumption, lowers the failure rate of the energy storage device, reduces maintenance costs, and lowers manufacturing costs, thereby improving the economic efficiency of the energy storage device.

[0112] The following is for reference. Figures 3-13 Describes an energy storage device 100 according to an embodiment of this application.

[0113] like Figure 3 , Figure 4 , Figure 5 , Figure 8 and Figure 9 As shown, the energy storage device 100 according to an embodiment of this application includes:

[0114] Energy storage box 10;

[0115] The battery device 20 is located inside the energy storage box 10. The battery device 20 includes a battery cell 21, a heat-conducting structure 22, and a heat-exchange structure 23. The battery cell 21 includes at least one battery cell 211. A medium-containing cavity 223 is formed in the heat-conducting structure 22. The medium-containing cavity 223 is configured to contain a phase change medium. The heat-conducting structure 22 is in heat-exchange cooperation with the battery cell 21 and the heat-exchange structure 23.

[0116] The heat dissipation structure 30 is located outside the energy storage box 10. The heat dissipation structure 30 and the heat exchange structure 23 are connected to form a circulation path for the heat exchange medium.

[0117] The energy storage device 100 includes an energy storage box 10, a battery device 20, and a heat dissipation structure 30. The energy storage box 10 can define an installation space, which can be an enclosed space or an open space. For example, the energy storage box 10 can be made of metal. The battery device 20 is disposed within the energy storage box 10, and multiple battery devices 20 can be configured; the number of battery devices 20 can be reasonably selected according to actual conditions. A battery rack can be provided within the energy storage box 10, and the battery devices 20 can be placed on the battery rack.

[0118] The battery device 20 includes a battery cell 21, a heat-conducting structure 22, and a heat-exchange structure 23. The battery cell 21 includes at least one battery cell 211. This application describes the battery cell 21 as including multiple battery cells 211 as an example. When the battery cell 21 includes multiple battery cells 211, the battery cell 21 can be the battery cell assembly of the above embodiment.

[0119] A medium-containing cavity 223 is formed within the heat-conducting structure 22, where the phase change medium can be stored. A portion of the space within the medium-containing cavity 223 is filled with the phase change medium. The phase change medium can be a liquid phase change medium, or it can be dry ice. The type of phase change medium is not specifically limited, as long as the liquid phase change medium changes to a gaseous state upon heating, and the gaseous phase change medium can change back to a liquid state upon encountering a lower-temperature substance. The heat-conducting structure 22 can be made of a metallic material; for example, it can be made of aluminum, iron, or other materials. The heat-conducting structure 22 cooperates with the battery cell 21 for heat exchange. As one example, the heat-conducting structure 22 directly contacts the outer shell 2113 of the battery cell 211 for heat exchange. As another example, a first thermally conductive adhesive layer is provided between the heat-conducting structure 22 and the battery cell 21, thereby allowing indirect heat exchange between the heat-conducting structure 22 and the outer shell 2113 of the battery cell 211. By providing the first thermally conductive adhesive layer, the thermal resistance between the heat-conducting structure 22 and the battery cell 21 is reduced. Both the heat-conducting structure 22 and the heat-exchange structure 23 are in heat-exchange cooperation. As one example, the heat-conducting structure 22 and the heat-exchange structure 23 are in direct contact for heat exchange. As another example, a second thermally conductive adhesive layer is provided between the heat-conducting structure 22 and the heat-exchange structure 23, thereby allowing the heat-conducting structure 22 and the heat-exchange structure 23 to exchange heat indirectly. By providing the second thermally conductive adhesive layer, it is beneficial to reduce the thermal resistance between the heat-conducting structure 22 and the heat-exchange structure 23. This application describes an example where a part of the structure of the heat-conducting structure 22 is in heat-exchange cooperation with the battery cell 21, and another part of the structure of the heat-conducting structure 22 is in heat-exchange cooperation with the heat-exchange structure 23. The part of the heat-conducting structure 22 that is in heat-exchange cooperation with the battery cell 21 forms a medium-containing cavity 223, and the part of the heat-conducting structure 22 that is in heat-exchange cooperation with the heat-exchange structure 23 forms a medium-containing cavity 223. The medium-containing cavity 223 at the part of the heat-conducting structure 22 that is in heat-exchange cooperation with the battery cell 21 and the medium-containing cavity 223 at the part of the heat-conducting structure 22 that is in heat-exchange cooperation with the heat-exchange structure 23 are connected.

[0120] The heat dissipation structure 30 is disposed outside the energy storage box 10. The heat dissipation structure 30 can be fixed to the energy storage box 10 or fixed to other structural components. The heat dissipation structure 30 can be made of metal materials. For example, the heat dissipation structure 30 can be made of materials such as aluminum or iron.

[0121] A first flow channel can be formed within the heat exchange structure 23, having a first inlet 231 and a first outlet 232. A second flow channel 31 can be formed within the heat dissipation structure 30, having a second inlet and a second outlet. The first inlet 231 and the second outlet are connected, and the first outlet 232 and the second inlet are connected, thereby connecting the heat dissipation structure 30 and the heat exchange structure 23 to form a circulating flow path for the heat exchange medium. The heat exchange medium can circulate within the circulating flow path. The heat exchange medium can be a gaseous heat exchange medium or a liquid heat exchange medium. This application uses water as an example for the heat exchange medium.

[0122] Specifically, heat from the battery cell 211 is transferred from the outer casing 2113 to the heat-conducting structure 22. The liquid phase change medium in the medium-containing cavity 223 at the heat exchange mating part between the heat-conducting structure 22 and the battery cell 21 is heated and becomes a gaseous phase change medium. The gaseous phase change medium can flow into the medium-containing cavity 223 at the heat exchange mating part between the heat-conducting structure 22 and the heat exchange structure 23. The gaseous phase change medium condenses and releases heat at the heat exchange mating part between the heat-conducting structure 22 and the heat exchange structure 23, and the gaseous phase change medium becomes a liquid phase change medium. The heat is returned to the medium-containing cavity 223 at the heat exchange interface between the heat-conducting structure 22 and the battery cell 21, so that the phase change medium circulates within the medium-containing cavity 223. At the same time, the heat released by the condensation of the gaseous phase change medium is transferred to the heat dissipation structure 30 through the heat-conducting structure 22. Through the circulation of the heat exchange medium in the circulation path, the heat on the heat exchange structure 23 can be transferred to the heat dissipation structure 30. Finally, the heat is dissipated to the external environment of the energy storage device 100 through the heat dissipation structure 30, achieving the heat dissipation and cooling effect of the battery cell 211.

[0123] In this application, the heat-conducting structure 22 can transfer the heat of the battery cell 211 to the heat exchange structure 23. Through the circulation of the heat exchange medium in the circulation path, the heat on the heat exchange structure 23 is transferred to the heat dissipation structure 30. The energy storage device 100 of this application does not need to be equipped with components such as water-cooling units, and does not need to rely on components such as fans, condensers, and compressors for heat dissipation. Compared with the prior art, this application does not need to be equipped with water-cooling units, and the heat dissipation structure 30 for heat dissipation of battery cells 211 is simple and has fewer components. This is beneficial to reducing the failure rate of the energy storage device 100, reducing the manufacturing cost of the energy storage device 100, and reducing the power consumption required for heat dissipation, thereby reducing heat dissipation energy consumption. At the same time, the number of parts that need to be replaced and maintained regularly in the energy storage device 100 is reduced, which is beneficial to reducing the operation and maintenance costs of the energy storage device 100 throughout its entire life cycle, thereby improving the economic benefits of the energy storage device 100.

[0124] In the above technical solution, the combination of heat conduction structure 22, heat exchange structure 23 and heat dissipation structure 30, compared with the prior art, is beneficial to reduce heat dissipation energy consumption, reduce the failure rate of energy storage device 100, reduce the maintenance cost of energy storage device 100, and reduce the manufacturing cost of energy storage device 100, thereby improving the economic benefits of energy storage device 100.

[0125] In some examples of this application, such as Figures 8-10 As shown, the heat-conducting structure 22 includes a first heat-conducting part 221 and a second heat-conducting part 222 that are bent and connected. The first heat-conducting part 221 is in heat exchange cooperation with the corresponding battery cell 211, and the second heat-conducting part 222 is in heat exchange cooperation with the corresponding heat-conducting structure 23. In the vertical direction, the second heat-conducting part 222 is located above the first heat-conducting part 221. The medium receiving cavity 223 includes a first receiving cavity 2231 and a second receiving cavity 2232 that are connected. The first receiving cavity 2231 is formed in the first heat-conducting part 221, and the second receiving cavity 2232 is formed in the second heat-conducting part 222.

[0126] The heat-conducting structure 22 may include a first heat-conducting part 221 and a second heat-conducting part 222. The first heat-conducting part 221 and the second heat-conducting part 222 are bent and connected. The included angle between the first heat-conducting part 221 and the second heat-conducting part 222 can be reasonably selected and set according to the actual situation. This application takes an included angle of 90° between the first heat-conducting part 221 and the second heat-conducting part 222 as an example. In other words, this application takes the first heat-conducting part 221 and the second heat-conducting part 222 as a perpendicular example.

[0127] The first heat-conducting part 221 and the corresponding battery cell 211 are in heat exchange cooperation. The corresponding battery cell 211 refers to the battery cell 211 that is in heat exchange cooperation with the heat-conducting structure 22. The second heat-conducting part 222 and the corresponding heat exchange structure 23 are in heat exchange cooperation. The corresponding heat exchange structure 23 refers to the heat exchange structure 23 that is in heat exchange cooperation with the heat-conducting structure 22. Along the vertical direction, as... Figure 8 As shown, the vertical direction is Figure 8 In the Z direction, the second heat-conducting part 222 is located above the first heat-conducting part 221. The medium receiving cavity 223 includes a first receiving cavity 2231 and a second receiving cavity 2232, which are connected. The first receiving cavity 2231 is formed inside the first heat-conducting part 221, and the second receiving cavity 2232 is formed inside the second heat-conducting part 222.

[0128] The liquid phase change medium can absorb heat and evaporate into a gaseous phase change medium in the first receiving cavity 2231 of the first heat-conducting part 221. The gaseous phase change medium can condense and release heat in the second receiving cavity 2232 of the second heat-conducting part 222. The heat on the battery cell 211 is transferred from the outer shell 2113 of the battery cell 211 to the first heat-conducting part 221. The liquid phase change medium in the first receiving cavity 2231 is heated and becomes a gaseous phase change medium. The gaseous phase change medium can flow into the second receiving cavity 2232. The gaseous phase change medium condenses and releases heat in the second receiving cavity 2232 and becomes a liquid phase change medium again, flowing back into the first receiving cavity 2231. This causes the phase change medium to circulate in the medium receiving cavity 223. At the same time, the heat released by the condensation of the gaseous phase change medium is transferred to the heat dissipation structure 30 through the heat-conducting structure 22. The heat is dissipated to the external environment of the energy storage device 100 through the heat dissipation structure 30, achieving the heat dissipation and cooling effect of the battery cell 211.

[0129] In the above technical solution, by providing the first heat-conducting part 221 and the second heat-conducting part 222, different areas of the heat-conducting structure 22 can respectively exchange heat with the corresponding battery cell 211 and the corresponding heat exchange structure 23, so that the heat of the battery cell 211 can be quickly transferred to the heat exchange structure 23. Furthermore, since the gaseous phase change medium flows upward, and the second heat-conducting part 222 is located above the first heat-conducting part 221, after the liquid phase change medium is heated and becomes a gaseous phase change medium, it is convenient for the gaseous phase change medium to flow into the second receiving cavity 2232, thereby facilitating the transfer of heat to the second heat-conducting part 222. This facilitates the transfer of heat to the heat exchange structure 23 via the second heat-conducting part 222, making the structure of the heat-conducting structure 22 more reasonable. At the same time, since the liquid phase change medium flows downward under the action of gravity, and is positioned above the first heat-conducting part 221 via the second heat-conducting part 222, when the gaseous phase change medium in the second receiving cavity 2232 condenses and releases heat to become a liquid phase change medium, it is convenient for the liquid phase change medium in the second receiving cavity 2232 to flow back to the first receiving cavity 2231, thereby facilitating the circulation of the phase change medium in the first receiving cavity 2231 and the second receiving cavity 2232.

[0130] In some examples of this application, such as Figure 8 As shown, there are multiple second heat-conducting parts 222 and multiple heat exchange structures 23, and the multiple second heat-conducting parts 222 are respectively matched with the multiple heat exchange structures 23 for heat exchange.

[0131] The second heat-conducting part 222 can be configured in two, three, four, five, or other numbers, and the heat exchange structure 23 can be configured in two, three, four, five, or other numbers. The number of second heat-conducting parts 222 can be the same as the number of heat exchange structures 23, or the number of second heat-conducting parts 222 can be different from the number of heat exchange structures 23. Each second heat-conducting part 222 is heat-exchange matched with at least one heat exchange structure 23. This application uses the example of each second heat-conducting part 222 being heat-exchange matched with one heat exchange structure 23 for illustration.

[0132] As an example, such as Figure 8 As shown, both the second heat-conducting part 222 and the heat exchange structure 23 are configured in pairs. The two second heat-conducting parts 222 are opposite to each other and spaced apart along a first direction, which is... Figure 8 In the X direction, the first heat-conducting part 221 is connected between the two second heat-conducting parts 222. Along the first direction, the battery unit 21 is located between the two second heat-conducting parts 222. The second heat-conducting parts 222 and the battery unit 21 are located between the two heat exchange structures 23. The two second heat-conducting parts 222 are respectively heat-exchange cooperative with the heat exchange structure 23 on the corresponding side.

[0133] As another example, there are three second heat-conducting parts 222 and three heat exchange structures 23. The three second heat-conducting parts 222 are all connected to the first heat-conducting part 221. The three second heat-conducting parts 222 are located on different sides of the first heat-conducting part 221. The three second heat-conducting parts 222 are respectively arranged with three heat exchange junctions, and the second heat-conducting parts 222 are heat-exchange matched with the heat exchange structures 23 on the corresponding side.

[0134] In the above technical solution, by setting multiple second heat-conducting parts 222 and multiple heat exchange structures 23, the multiple second heat-conducting parts 222 can simultaneously cooperate with the multiple heat exchange structures 23 to increase the heat exchange area between the heat-conducting structure 22 and the heat exchange structure 23, which is conducive to improving the heat transfer efficiency between the heat-conducting structure 22 and the heat exchange structure 23, and thus more conducive to the heat dissipation and cooling of the battery cell 211.

[0135] In some examples of this application, such as Figure 8 As shown, there are two second heat-conducting parts 222. The two second heat-conducting parts 222 are opposite to each other and spaced apart along the first direction of the battery device 20. The first heat-conducting part 221 is connected between the two second heat-conducting parts 222. In the vertical direction, the battery cell 21 is located above the first heat-conducting part 221 and between the two second heat-conducting parts 222. The first direction is perpendicular to the vertical direction.

[0136] Each heat-conducting structure 22 includes two second heat-conducting parts 222 and one first heat-conducting part 221. The two second heat-conducting parts 222 are opposite to and spaced apart along a first direction of the battery device 20. The first direction is... Figure 8In the X direction, both second heat-conducting parts 222 are located above the first heat-conducting part 221. The first heat-conducting part 221 is connected between the two second heat-conducting parts 222. In the vertical direction, the battery unit 21 is located above the first heat-conducting part 221. In the first direction, the battery unit 21 is located between the two second heat-conducting parts 222. The second heat-conducting parts 222 can be spaced apart from the battery unit 21 in the first direction.

[0137] In the above technical solution, by setting two second heat-conducting parts 222, the two second heat-conducting parts 222 of the same heat-conducting structure 22 can simultaneously cooperate with the corresponding heat exchange structure 23 for heat exchange, which is beneficial to increase the heat exchange area of ​​the heat-conducting structure 22 and the heat exchange structure 23, thereby improving the heat transfer efficiency between the heat-conducting structure 22 and the heat exchange structure 23. Furthermore, the battery unit 21 is located above the first heat-conducting part 221 and between the two second heat-conducting parts 222. Compared with the battery unit 21 being located below the first heat-conducting part 221, this is beneficial to improve the structural compactness of the battery device 20 and reduce the volume of the battery device 20, thereby facilitating the miniaturization design of the battery device 20 and, consequently, the miniaturization design of the energy storage device 100.

[0138] In some examples of this application, such as Figure 8 As shown, there are two heat exchange structures 23. Along the first direction, each second heat-conducting part 222 is provided with a heat exchange structure 23 on the side opposite to the battery cell 21.

[0139] In this embodiment, the battery device 20 may include two heat exchange structures 23, which are arranged opposite to each other and spaced apart along a first direction. Along the first direction, a heat conduction structure 22 is located between the two heat exchange structures 23, and the two second heat conduction parts 222 of the same heat conduction structure 22 are respectively heat exchanged with the two heat exchange structures 23.

[0140] In the above technical solution, by providing a heat exchange structure 23 on the side of each second heat-conducting part 222 away from the battery cell 21, the relative positions of the second heat-conducting part 222 and the heat exchange structure 23 are reasonably set, which facilitates the heat exchange cooperation between the second heat-conducting part 222 and the corresponding heat exchange structure 23, thereby facilitating the production and manufacturing of the battery device 20, reducing the manufacturing difficulty of the heat exchange structure 23, and thus improving the production efficiency of the battery device 20.

[0141] In some examples of this application, such as Figure 10 As shown, the battery device 20 also includes: a base plate 24, which is located below the battery cell 21 and in heat exchange cooperation with the battery cell 211 in the vertical direction, and a first heat-conducting part 221 is located between the base plate 24 and the battery cell 21 and in heat exchange cooperation with the base plate 24.

[0142] The battery device 20 may further include a base plate 24, which may be made of a thermally conductive material. For example, the base plate 24 may be made of a metal material, such as aluminum or iron. Vertically, the base plate 24 is located below the battery cell 21, and it can exchange heat with the battery cell 211 of the battery cell 21. As an example, the base plate 24 directly contacts the outer casing 2113 of the battery cell 211 for heat exchange. As another example, a third thermally conductive adhesive layer is provided between the base plate 24 and the battery cell 21, thereby allowing indirect heat exchange between the base plate 24 and the outer casing 2113 of the battery cell 211. By providing the third thermally conductive adhesive layer, the thermal resistance between the base plate 24 and the battery cell 21 is reduced.

[0143] In the vertical direction, the first heat-conducting part 221 is located between the base plate 24 and the battery unit 21, and the first heat-conducting part 221 and the base plate 24 are in heat exchange cooperation. As an example, the base plate 24 and the first heat-conducting part 221 are in direct contact for heat exchange. As another example, a fourth thermally conductive adhesive layer is provided between the base plate 24 and the first heat-conducting part 221, so that the base plate 24 and the first heat-conducting part 221 are indirectly heat exchanged. By providing the fourth thermally conductive adhesive layer, it is beneficial to reduce the thermal resistance between the base plate 24 and the first heat-conducting part 221.

[0144] In the above technical solution, by setting a bottom support plate 24, the bottom support plate 24 can be fixed on the battery rack inside the energy storage box 10 as a load-bearing component. The bottom support plate 24 can reliably support the battery unit 21, so that the battery unit 21 is stably assembled inside the energy storage box 10. Furthermore, the bottom support plate 24 is in heat exchange cooperation with the battery cell 211 and the first heat-conducting part 221. The bottom support plate 24 acts as a temperature equalization plate, which is beneficial to improve the temperature uniformity of the multiple battery cells 211 of the battery unit 21 and to reduce the temperature difference of the multiple battery cells 211 of the battery unit 21, thereby reducing the risk of local overheating of the battery device 20.

[0145] In some examples of this application, such as Figure 10 As shown, a mounting groove 241 is formed on the side of the base plate 24 facing the battery cell 21, and at least a portion of the first heat-conducting part 221 is mounted in the mounting groove 241.

[0146] The base plate 24 has a mounting groove 241 located on the side of the base plate 24 facing the battery cell 21. The mounting groove 241 extends along a first direction to the edge of the base plate 24, meaning it penetrates the base plate 24 along the first direction. The mounting groove 241 is open towards the end of the battery cell 21. At least a portion of the first heat-conducting part 221 is mounted in the corresponding mounting groove 241. As an example, a portion of the structure of the first heat-conducting part 221 is mounted in the corresponding mounting groove 241; as another example, the entire structure of the first heat-conducting part 221 is mounted in the corresponding mounting groove 241. Exemplarily, the first heat-conducting part 221 and the mounting groove 241 are arranged in a one-to-one correspondence, meaning that one first heat-conducting part 221 is mounted in each mounting groove 241.

[0147] In the above technical solution, by assembling the first heat-conducting part 221 into the assembly groove 241 of the base plate 24, the first heat-conducting part 221 can be embedded in the base plate 24. The sidewall of the assembly groove 241 can limit the heat-conducting structure 22, which is conducive to improving the positional stability of the heat-conducting structure 22 and reducing the risk of displacement of the heat-conducting structure 22 relative to the corresponding battery cell 211 and the corresponding heat exchange structure 23. This is conducive to improving the heat exchange reliability between the heat-conducting structure 22 and the corresponding battery cell 211 and the corresponding heat exchange structure 23. Furthermore, it is conducive to increasing the heat exchange area between the first heat-conducting part 221 and the base plate 24, and improving the heat transfer efficiency between the first heat-conducting part 221 and the base plate 24 per unit time.

[0148] In some examples of this application, such as Figure 8 and Figure 10 As shown, the second heat-conducting part 222 has a medium injection port 224, which is connected to the medium receiving cavity 223.

[0149] The medium injection port 224 can be formed at the upper end of the second heat-conducting part 222. When the heat-conducting structure 22 includes multiple second heat-conducting parts 222, at least one of the second heat-conducting parts 222 has a medium injection port 224. The medium injection port 224 can be directly connected to the medium receiving cavity 223, or it can be indirectly connected to the medium receiving cavity 223 through a transition structure. When it is necessary to inject a phase change medium into the medium receiving cavity 223, the medium injection port 224 is opened, and the phase change medium is injected into the medium receiving cavity 223 through the medium injection port 224. After the phase change medium injection is completed, the medium injection port 224 is closed to reduce the risk of external substances flowing into the medium receiving cavity 223 and clogging it. For example, the medium injection port 224 can be provided with an on / off valve, which is used to open or close the medium injection port 224.

[0150] In the above technical solution, a medium injection port 224 is formed through the second heat-conducting part 222, which can inject the phase change medium into the medium receiving cavity 223, thereby achieving the effect of assembling the phase change medium into the medium receiving cavity 223.

[0151] In some examples of this application, such as Figure 4 and Figure 5 As shown, the energy storage device 100 also includes: heat dissipation fins 40, which are disposed on the heat dissipation structure 30.

[0152] The energy storage device 100 may further include heat dissipation fins 40, which may be made of metal materials, such as aluminum or iron. The heat dissipation fins 40 may be integrally formed with the heat dissipation structure 30 to reduce the risk of separation. Alternatively, the heat dissipation fins 40 may be separate from the heat dissipation structure 30 and may be welded to it. When the heat exchange medium circulates between the heat dissipation structure 30 and the heat exchange structure 23, transferring heat to the heat dissipation structure 30, the heat on the heat dissipation structure 30 can be transferred to the heat dissipation fins 40. The heat from the heat dissipation fins 40 and the heat dissipation structure 30 is then dissipated to the external environment of the energy storage device 100 by natural wind.

[0153] The number of heat dissipation fins 40 can be reasonably selected according to the actual situation. This application uses the example of having multiple heat dissipation fins 40 for illustration. For example, multiple heat dissipation fins 40 are arranged on the side of the heat dissipation structure 30 away from the energy storage box 10, and the multiple heat dissipation fins 40 are arranged alternately in the vertical direction.

[0154] In the above technical solution, the heat dissipation fins 40 are provided on the heat dissipation structure 30, and the heat on the heat dissipation structure 30 can be transferred to the heat dissipation fins 40. The heat on the heat dissipation fins 40 and the heat dissipation structure 30 can be dissipated to the external environment of the energy storage device 100 by the natural wind outside the energy storage device 100, which is conducive to improving the heat dissipation efficiency of the energy storage device 100. There is no need to set up a blower or other air supply structure to blow air to the heat dissipation fins 40 and the heat dissipation structure 30 to achieve heat dissipation of the energy storage device 100, which is more conducive to reducing heat dissipation energy consumption.

[0155] In some examples of this application, at least one of the outer surface of the heat dissipation structure 30 and the outer surface of the heat dissipation fins 40 is provided with a heat dissipation layer.

[0156] As an example, the outer surface of the heat dissipation structure 30 is provided with a heat dissipation layer. As another example, the outer surface of the heat dissipation fins 40 is provided with a heat dissipation layer. As yet another example, both the outer surfaces of the heat dissipation structure 30 and the outer surfaces of the heat dissipation fins 40 are provided with heat dissipation layers; this application uses the example of the outer surface of the heat dissipation fins 40 being provided with a heat dissipation layer. As an example, the heat dissipation layer can be a metal-based heat dissipation layer. A metal-based heat dissipation layer enables the heat on the heat dissipation fins 40 to dissipate quickly, which is beneficial to improving the heat dissipation efficiency of the heat dissipation fins 40, thereby improving the heat dissipation efficiency of the energy storage device 100.

[0157] As another example, the heat dissipation layer can also be a radiative heat dissipation layer. A radiative heat dissipation layer is a functional layer that dissipates heat using the principle of thermal radiation. It can be made of a high-reflectivity material, such as aluminum foil or other metals, or it can be a radiative heat dissipation cooling coating. The radiative heat dissipation layer radiates heat into the surrounding environment of the energy storage device 100, thereby achieving heat dissipation and facilitating the rapid dissipation of heat from the heat dissipation fins 40, thus improving the heat dissipation efficiency of the heat dissipation fins 40.

[0158] In the above technical solution, by setting a heat dissipation layer, it is beneficial to dissipate the heat on the heat dissipation fins 40 quickly, thereby improving the heat dissipation efficiency of the heat dissipation fins 40.

[0159] In some examples of this application, such as Figure 8 , Figure 11 and Figure 12 As shown, the battery cell 21 and the first heat-conducting part 221 are arranged in a vertical direction. The first heat-conducting part 221 includes a heat-conducting body 2211. The heat-conducting body 2211 and the corresponding battery cell 211 are vertically aligned. The heat-conducting body 2211 includes a first heat-conducting section 2212 and a second heat-conducting section 2213 arranged and connected in a first direction of the battery device 20. The end face of the battery cell 211 facing the corresponding heat-conducting body 2211 has a central heat exchange area 2111 and an edge heat exchange area 2112 arranged in the first direction. At least a portion of the first heat-conducting section 2212 corresponds to the central heat exchange area 2111, and at least a portion of the second heat-conducting section 2213 corresponds to the edge heat exchange area 2112. In the second direction of the battery device 20, the width of the first heat-conducting section 2212 is greater than the width of the second heat-conducting section 2213. The first direction, the second direction, and the vertical direction are perpendicular to each other.

[0160] In this configuration, the battery unit 21 and the first heat-conducting part 221 are arranged vertically. As an example, the battery unit 21 can be located below the first heat-conducting part 221; as another example, the battery unit 21 can be located above the first heat-conducting part 221. Figure 8As shown, this application describes the situation with the battery cell 21 located above the first heat-conducting part 221 as an example. The first heat-conducting part 221 includes a heat conductor 2211, and each heat conductor 2211 is vertically disposed corresponding to at least one battery cell 211. This application describes the situation with each heat conductor 2211 and one battery cell 211 vertically disposed as an example, and the heat conductor 2211 and the corresponding battery cell 211 are in heat exchange cooperation.

[0161] like Figure 11 and Figure 12 As shown, the heat conductor 2211 includes a first heat conductor section 2212 and a second heat conductor section 2213. The first heat conductor section 2212 and the second heat conductor section 2213 are arranged and connected along the first direction of the battery device 20. The outer shell 2113 of the battery cell 211 has a central heat exchange zone 2111 and an edge heat exchange zone 2112 on the end face facing the corresponding heat conductor 2211. The central heat exchange zone 2111 and the edge heat exchange zone 2112 are arranged along the first direction of the battery device 20 and are connected. The heat at the central heat exchange zone 2111 is greater than the heat at the edge heat exchange zone 2112 per unit time. There are two edge heat exchange zones 2112, and the central heat exchange zone 2111 is connected between the two edge heat exchange zones 2112.

[0162] Along the vertical direction, at least a portion of the structure of the first heat-conducting section 2212 corresponds to the central heat exchange zone 2111, and at least a portion of the structure of the second heat-conducting section 2213 corresponds to the corresponding edge heat exchange zone 2112. As an example, there is one first heat-conducting section 2212 and two second heat-conducting sections 2213. The first heat-conducting section 2212 is connected between the two second heat-conducting sections 2213. The first heat-conducting section 2212 corresponds to the central heat exchange zone 2111 of the corresponding battery cell 211, and the two second heat-conducting sections 2213 correspond to the two edge heat exchange zones 2112 of the corresponding battery cell 211.

[0163] Along the second direction of the battery device 20, such as Figure 8 As shown, the second direction of the battery device 20 is Figure 8 The direction perpendicular to the paper, such as Figure 11 As shown, the second direction of the battery device 20 is Figure 11 In the Y direction, in other words, the second direction of the battery device 20 is the width direction of the battery cell 211. The width of the first heat-conducting section 2212 is greater than the width of the second heat-conducting section 2213, which enables the heat conduction capacity of the first heat-conducting section 2212 to be greater than that of the second heat-conducting section 2213.

[0164] It should be noted that, per unit time, the heat generated at the central heat exchange zone 2111 of the battery cell 211 is greater than the heat generated at the edge heat exchange zone 2112 of the battery cell 211. Therefore, by having the first heat conduction section 2212 correspond to the central heat exchange zone 2111 and the second heat conduction section 2213 correspond to the edge heat exchange zone 2112, the part of the heat conductor 2211 with higher thermal conductivity corresponds to the central heat exchange zone 2111, and the part of the heat conductor 2211 with lower thermal conductivity corresponds to the central heat exchange zone 2111. This improves the heat transfer efficiency at the central heat exchange zone 2111 of the battery cell 211, allowing the heat at the central heat exchange zone 2111 of the battery cell 211 to be quickly removed. This helps to improve the temperature uniformity of different areas of the battery cell 211, thereby reducing the risk of overheating in localized areas of the battery cell 211 and extending the service life of the battery cell 211.

[0165] In the above technical solution, along the second direction of the battery device 20, by setting the width of the first heat-conducting section 2212 to be greater than the width of the second heat-conducting section 2213, the first heat-conducting section 2212 and the second heat-conducting section 2213 can be matched with different heat-generating areas of the battery cell 211, which is beneficial to improve the temperature uniformity of different areas of the battery cell 211, thereby reducing the risk of overheating in local positions of the battery cell 211 and extending the service life of the battery cell 211.

[0166] In some examples of this application, the first heat-conducting part 221 includes a plurality of heat conductors 2211, which are arranged sequentially along a first direction, and the plurality of heat conductors 2211 are respectively in heat exchange cooperation with the corresponding battery cell 211.

[0167] The first heat-conducting part 221 may include multiple heat conductors 2211. The first heat-conducting part 221 may include two, three, four, five, or other numbers of heat conductors 2211. The number of heat conductors 2211 in the first heat-conducting part 221 can be reasonably selected and set according to the actual situation. The multiple heat conductors 2211 of the same first heat-conducting part 221 can be arranged sequentially and connected along the first direction of the battery device 20. The multiple heat conductors 2211 are respectively opposite to the corresponding battery cell 211 in the vertical direction, and the multiple heat conductors 2211 are respectively heat exchanged with the corresponding battery cell 211. For example, the heat conductors 2211 and the battery cells 211 are arranged in a one-to-one correspondence.

[0168] The battery unit 21 may include multiple battery cells 211. The first heat-conducting part 221 may be arranged vertically opposite to the multiple battery cells 211. The multiple battery cells 211 corresponding to the first heat-conducting part 221 are arranged sequentially along the first direction of the battery device 20. Therefore, by including multiple heat conductors 2211 in the first heat-conducting part 221 and arranging them sequentially along the first direction of the battery device 20, the multiple heat conductors 2211 of the first heat-conducting part 221 can be matched with the multiple battery cells 211 corresponding to the first heat-conducting part 221, so that each battery cell 211 has a corresponding heat conductor 2211 for heat conduction, thereby improving the temperature uniformity of the multiple battery cells 211 in the battery unit 21.

[0169] In the above technical solution, by setting the first heat-conducting part 221 to include a plurality of heat-conducting bodies 2211, and the plurality of heat-conducting bodies 2211 of the first heat-conducting part 221 are arranged sequentially along the first direction of the battery device 20, the plurality of heat-conducting bodies 2211 of the first heat-conducting part 221 can be matched with the plurality of battery cells 211 corresponding to the first heat-conducting part 221, so that each battery cell 211 has a corresponding heat-conducting body 2211 for heat conduction, thereby improving the temperature uniformity of the plurality of battery cells 211 of the battery unit 21.

[0170] In some examples of this application, such as Figure 9 and Figure 10 As shown, there are multiple heat-conducting structures 22, which are arranged sequentially along the second direction. The battery cell 21 includes multiple rows of battery bars, which are arranged sequentially along the second direction. Each row of battery bars corresponds to one of the multiple heat-conducting structures 22.

[0171] The battery unit 21 may include multiple individual battery cells 211, which can form multiple rows of battery packs. These rows are arranged sequentially along the second direction of the battery device 20. Each row includes at least one individual battery cell 211. This application uses the example of each row including multiple individual battery cells 211 for illustration. The multiple individual battery cells 211 in each row are arranged sequentially along the first direction of the battery device 20. The battery device 20 may include multiple heat-conducting structures 22. The number of heat-conducting structures 22 can be the same as the number of battery packs. These multiple heat-conducting structures 22 are arranged sequentially along the second direction of the battery device 20. The multiple rows of battery packs and the multiple heat-conducting structures 22 are arranged in a one-to-one correspondence along the vertical direction.

[0172] In the above technical solution, by setting multiple heat-conducting structures 22, and setting multiple rows of battery packs and multiple heat-conducting structures 22 in a vertical direction, each row of battery packs can have a corresponding heat-conducting structure 22 for heat conduction. The heat of the battery cell 211 can be transferred to the heat exchange structure 23 through the corresponding heat-conducting structure 22, which is more conducive to improving the temperature uniformity of multiple battery cells 211 in the battery unit 21.

[0173] In some examples of this application, such as Figure 6 As shown, the energy storage device 100 also includes a drive pump 50, which is located on the communication path between the heat dissipation structure 30 and the heat exchange structure 23. The drive pump 50 is used to drive the heat exchange medium to circulate in the circulation path.

[0174] The energy storage device 100 may include a controller that is communicatively connected to the drive pump 50 and is used to control the drive pump 50 to turn on or off. As an example, a first flow channel may be formed within the heat exchange structure 23, having a first inlet 231 and a first outlet 232. A second flow channel 31 may be formed within the heat dissipation structure 30, having a second inlet and a second outlet. The energy storage device 100 may also include a first connecting pipe 60 and a second connecting pipe 70. The first connecting pipe 60 connects the first inlet 231 and the second outlet, and the second connecting pipe 70 connects the first outlet 232 and the second inlet, thereby connecting the heat dissipation structure 30 and the heat exchange structure 23 to form a circulating path for the heat exchange medium. At least one of the first connecting pipe 60 and the second connecting pipe 70 is equipped with a drive pump 50. When the drive pump 50 is turned on, it can drive the heat exchange medium to circulate between the heat dissipation structure 30 and the heat exchange structure 23, transferring heat to the heat dissipation structure 30.

[0175] As another example, the energy storage device 100 is provided with multiple heat exchange structures 23. A first flow channel can be formed in the heat exchange structure 23. The first flow channel has a first inlet 231 and a first outlet 232. A second flow channel 31 can be formed in the heat dissipation structure 30. The second flow channel 31 includes a first sub-flow channel 311 and a second sub-flow channel 312. A drive pump 50 is connected between the first sub-flow channel 311 and the second sub-flow channel 312. The first sub-flow channel 311 has multiple second inlets, and the second sub-flow channel 312 has multiple second outlets. The multiple first inlets 231 of the multiple heat exchange structures 23 are respectively connected to the multiple second outlets one by one. The multiple first outlets 232 of the multiple heat exchange structures 23 are respectively connected to the multiple second inlets, thereby connecting the heat dissipation structure 30 and the heat exchange structure 23 to form a circulating flow path for the heat exchange medium. When the drive pump 50 is turned on, it can drive the heat exchange medium to circulate between the heat dissipation structure 30 and the multiple heat exchange structures 23, so that heat is transferred to the heat dissipation structure 30.

[0176] In the above technical solution, by setting up a drive pump 50, when the drive pump 50 is turned on, the liquid heat exchange medium circulates between the heat dissipation structure 30 and multiple heat exchange structures 23, so that the heat generated by the battery cell 211 is quickly transferred to the heat dissipation structure 30, thereby continuously transferring heat to the heat dissipation structure 30, which is conducive to improving the heat dissipation efficiency of the energy storage device 100 and extending the service life of the energy storage device 100.

[0177] In some examples of this application, the drive pump 50 is configured to drive the heat exchange medium to circulate within the circulation path when the average temperature of the battery cells 211 of the energy storage device 100 is greater than the ambient temperature.

[0178] The energy storage device 100 may include a controller, which may be communicatively connected to the drive pump 50 and is used to control the drive pump 50 to turn on or off.

[0179] The battery management unit (BMS) of the energy storage device 100 calculates the highest, lowest, and average temperatures of multiple battery cells 211 within the energy storage device 100, as well as the ambient temperature outside the energy storage device 100, every first preset time interval. The BMS is communicatively connected to the controller. When the average temperature of the battery cells 211 in the energy storage device 100 is higher than the ambient temperature, the energy storage device 100 requires higher heat dissipation efficiency. The controller controls the drive pump 50 to turn on, allowing the heat generated by the battery cells 211 to be quickly transferred to the heat dissipation structure 30, thus continuously transferring heat to the heat dissipation structure 30 and improving the heat dissipation efficiency of the energy storage device 100. When the average temperature of the battery cells 211 in the energy storage device 100 is less than or equal to the ambient temperature, the energy storage device 100 requires lower heat dissipation efficiency. The controller controls the drive pump 50 to turn off, which can also meet the heat dissipation requirements of the energy storage device 100.

[0180] In the above technical solution, the drive pump 50 is configured to drive the heat exchange medium to circulate in the circulation path when the average temperature of the battery cells 211 of the energy storage device 100 is higher than the ambient temperature. When the energy storage device 100 requires a lower heat dissipation efficiency, the drive pump 50 can be turned off to meet the heat dissipation requirements of the energy storage device 100. At this time, the drive pump 50 does not consume electrical energy, which is more conducive to reducing heat dissipation energy consumption. In addition, the drive pump 50 does not work in real time, which is conducive to extending the service life of the drive pump 50. When the energy storage device 100 requires a higher heat dissipation efficiency, the drive pump 50 is turned on to meet the heat dissipation requirements of the energy storage device 100.

[0181] In some examples of this application, when the average temperature of the battery cells 211 of the energy storage device 100 is higher than the ambient temperature by a value exceeding a first preset temperature value (exemplarily, the first preset temperature value is 5°C or 6°C), the controller controls the drive pump 50 to turn on, so that the heat generated by the battery cells 211 is quickly transferred to the heat dissipation structure 30. When the average temperature of the battery cells 211 of the energy storage device 100 is higher than the ambient temperature but less than or equal to the first preset temperature value, or when the average temperature of the battery cells 211 of the energy storage device 100 is lower than the ambient temperature, the energy storage device 100 requires lower heat dissipation efficiency, and the controller controls the drive pump 50 to turn off.

[0182] In some examples of this application, when the average temperature of the battery cells 211 of the energy storage device 100 is greater than the ambient temperature by a value higher than a first preset temperature value (exemplarily, the first preset temperature value is 5°C or 6°C), the controller executes the formula... The undetermined rotational speed N1 of the drive pump 50 is calculated, where Tavg is the average temperature of the battery cell 211 in the energy storage device 100, and Tenv is the ambient temperature. The controller controls the drive pump 50 to operate at the rotational speed N1, so that the flow rate of the heat exchange medium meets the heat dissipation requirements, which is beneficial to the heat dissipation of the battery cell 211.

[0183] In some examples of this application, during the operation of the drive pump 50 at a rotational speed N2, the battery management unit (BMS) calculates the highest, lowest, and average temperatures of multiple battery cells 211 within the energy storage device 100, as well as the ambient temperature outside the energy storage device 100, at first preset intervals. The controller calculates the undetermined rotational speed N1 of the drive pump 50 according to a formula. If the absolute value of the difference between rotational speed N1 and rotational speed N2 is less than the preset rotational speed value, the controller does not control the drive pump 50 to adjust its frequency. If the absolute value of the difference between rotational speed N1 and rotational speed N2 is greater than or equal to the preset rotational speed value, the controller controls the drive pump 50 to adjust its frequency, thereby enabling the drive pump 50 to operate at the undetermined rotational speed N1, thus reducing the number of times the drive pump 50 adjusts its frequency, which is beneficial for extending the service life of the drive pump 50.

[0184] In some examples of this application, the battery cell 211 is a sodium-ion battery cell.

[0185] Existing energy storage devices contain lithium-ion battery cells, which are prone to thermal runaway at high temperatures. Current thermal management systems are inefficient at dissipating heat from these cells, increasing the risk of thermal runaway. Furthermore, lithium-ion battery cells rely on scarce resources such as lithium and cobalt, resulting in significant cost fluctuations and limited sustainability.

[0186] In this application, the battery cell 211 is a sodium-ion battery cell. Sodium-ion battery cells have good discharge retention at low temperatures. Moreover, compared with lithium-ion battery cells, sodium-ion battery cells are less prone to thermal runaway at high temperatures. At the same time, they can reduce dependence on scarce resources such as lithium and cobalt, which is conducive to reducing the long-term manufacturing cost of the energy storage device 100 and also conducive to the sustainable production of the energy storage device 100.

[0187] like Figure 2 As shown, the energy storage system according to the embodiment of this application includes an energy conversion system 201 and an energy storage device 100 as described above. The energy conversion system 201 and the energy storage device 100 are connected to convert the current input to the energy storage device 100 or output from the energy storage device 100 into energy.

[0188] An energy storage system may include one or more energy storage devices 100 and a power conversion system 201 (PCS). The power conversion system 201 is used to connect the power generation equipment 202, the power grid, or a load to the energy storage device 100. The power generation equipment 202 generates electrical energy, the energy storage device 100 stores electrical energy, and the power conversion system 201 converts the current input to the energy storage device 100 or the current output from the energy storage device 100 into energy. The electrical energy generated by the power generation equipment 202 can be stored in the energy storage device 100 through the power conversion system 201, and the electrical energy stored in the energy storage device 100 can also be output to the load or the power grid through the power conversion system 201. As an example, the power generation equipment 202 may specifically be a solar panel, a hydroelectric power generation device 202, a thermal power generation device 202, a wind power generation device 202, etc. The specific type of the power generation equipment 202 is not limited in this application.

[0189] like Figure 1 As shown, the charging network according to the embodiments of this application includes: a charging pile 300; an energy storage device 100 or an energy storage system as described in the above embodiments, wherein the energy storage device 100 is used to provide electrical energy to the charging pile 300.

[0190] As an example, a charging network includes a charging pile 300 and an energy storage device 100 as described in the above embodiment. The charging pile 300 is electrically connected to the energy storage device 100, which provides electrical energy to the charging pile 300. The charging pile 300 and the energy storage device 100 are electrically connected via a cable, and the energy storage device 100 can provide its stored electrical energy to the charging pile 300. The charging pile 300 has one or more connectors 301 for connecting to electrical equipment (such as a vehicle) to replenish energy for the equipment. The energy storage device 100 can be located inside the charging pile 300 (e.g., an integrated charging and energy storage unit) or outside the charging pile 300.

[0191] As another example, a charging network includes a charging pile 300 and an energy storage system as described in the above embodiments. The charging pile 300 is electrically connected to the energy storage system, which provides electrical energy to the charging pile 300. The charging pile 300 and the energy storage system are electrically connected via cables, and the energy storage device 100 can provide its stored electrical energy to the charging pile 300. The charging pile 300 has one or more connectors 301 for connecting to electrical equipment (such as a vehicle) to replenish energy to the equipment. The energy storage device 100 can be located inside the charging pile 300 (e.g., an integrated charging and energy storage unit) or outside the charging pile 300.

[0192] According to some embodiments of this application, see Figures 3-11 As shown, this application provides an energy storage device 100, including: an energy storage box 10, battery clusters, and a heat dissipation structure 30. Multiple battery clusters are included, each containing multiple battery devices 20 as described above, to increase the voltage and capacity of the energy storage device 100. The multiple battery devices 20 can be connected in series via a busbar to further increase the voltage of the energy storage device 100. When the energy storage device 100 includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device 100.

[0193] The battery device 20 is located inside the energy storage box 10. The battery device 20 includes a battery cell 21, a heat-conducting structure 22, and a heat exchange structure 23. The battery cell 21 includes multiple battery cells 211. A medium receiving cavity 223 is formed inside the heat-conducting structure 22. The medium receiving cavity 223 contains a phase change medium. The heat-conducting structure 22 is in heat exchange cooperation with the battery cell 21 and the heat exchange structure 23. The heat dissipation structure 30 is located outside the energy storage box 10. The heat dissipation structure 30 and the heat exchange structure 23 are connected to form a circulation path for the heat exchange medium.

[0194] The heat-conducting structure 22 includes a first heat-conducting part 221 and a second heat-conducting part 222 that are bent and connected together. There are two second heat-conducting parts 222. The first heat-conducting part 221 is connected between the two second heat-conducting parts 222. The battery cell 21 is located above the first heat-conducting part 221 and between the two second heat-conducting parts 222. The battery device 20 includes two heat-exchange structures 23. The heat-conducting structure 22 is located between the two heat-exchange structures 23. The first heat-conducting part 221 and the corresponding battery cell 211 are in heat-exchange cooperation. The second heat-conducting part 222 and the corresponding heat-exchange structure 23 are in heat-exchange cooperation. The medium receiving cavity 223 includes a first receiving cavity 2231 and a second receiving cavity 2232 that are connected. The first receiving cavity 2231 is formed in the first heat-conducting part 221, and the second receiving cavity 2232 is formed in the second heat-conducting part 222.

[0195] The battery device 20 also includes a base plate 24, which is located vertically below the battery cell 21 and engages with the battery cell 211 for heat exchange. A first heat-conducting part 221 is located between the base plate 24 and the battery cell 21 and engages with the base plate 24 for heat exchange. A mounting groove 241 is formed on the side of the base plate 24 facing the battery cell 21, and at least a portion of the first heat-conducting part 221 is mounted in the mounting groove 241. A second heat-conducting part 222 has a medium injection port 224, which communicates with a medium receiving cavity 223. The energy storage device 100 also includes a plurality of heat dissipation fins 40, which are disposed on the heat dissipation structure 30. A heat dissipation layer is provided on the outer surface of the heat dissipation fins 40.

[0196] The first heat-conducting part 221 includes a heat conductor 2211, which corresponds to a corresponding battery cell 211 in the vertical direction. The heat conductor 2211 includes a first heat-conducting section 2212 and a second heat-conducting section 2213 arranged and connected along the first direction of the battery device 20. At least a portion of the first heat-conducting section 2212 corresponds to the central heat exchange zone 2111, and at least a portion of the second heat-conducting section 2213 corresponds to the edge heat exchange zone 2112. Along the second direction of the battery device 20, the width of the first heat-conducting section 2212 is greater than the width of the second heat-conducting section 2213. The first heat-conducting part 221 includes a plurality of heat conductors 2211, which are arranged sequentially along the first direction of the battery device 20, and each heat conductor 2211 is in heat exchange cooperation with a corresponding battery cell 211.

[0197] Multiple heat-conducting structures 22 are arranged sequentially along the second direction of the battery device 20. Each battery cell 21 includes multiple rows of battery bars arranged sequentially along the second direction of the battery device 20. The multiple battery bars and the multiple heat-conducting structures 22 correspond one-to-one vertically. The energy storage device 100 also includes a drive pump 50, which is located on the communication path between the heat dissipation structure 30 and the heat exchange structure 23. The drive pump 50 drives the heat exchange medium to circulate within the circulation path. The drive pump 50 is configured to drive the heat exchange medium to circulate within the circulation path when the average temperature of the battery cells 211 in the energy storage device 100 is higher than the ambient temperature. The battery cells 211 are sodium-ion battery cells.

[0198] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0199] Other configurations and operations of the energy storage device 100 according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0200] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0201] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy storage device, characterized in that, include: Energy storage box; A battery device is disposed in the energy storage box. The battery device includes a battery cell, a heat-conducting structure, and a heat-exchange structure. The battery cell includes at least one battery cell. A medium-containing cavity is formed in the heat-conducting structure. The medium-containing cavity is configured to contain a phase change medium. The heat-conducting structure is in heat-exchange cooperation with the battery cell and the heat-exchange structure. A heat dissipation structure is provided outside the energy storage tank, and the heat dissipation structure and the heat exchange structure are connected to form a circulation path for the heat exchange medium.

2. The energy storage device according to claim 1, characterized in that, The heat-conducting structure includes: a first heat-conducting part and a second heat-conducting part that are bent and connected together. The first heat-conducting part is in heat exchange cooperation with the corresponding battery cell, and the second heat-conducting part is in heat exchange cooperation with the corresponding heat exchange structure. In the vertical direction, the second heat-conducting part is located above the first heat-conducting part. The medium receiving cavity includes a first receiving cavity and a second receiving cavity that are connected. The first receiving cavity is formed in the first heat-conducting part, and the second receiving cavity is formed in the second heat-conducting part.

3. The energy storage device according to claim 2, characterized in that, There are multiple second heat-conducting parts and multiple heat exchange structures, and the multiple second heat-conducting parts are respectively heat-exchange matched with the multiple heat exchange structures.

4. The energy storage device according to claim 2, characterized in that, There are two second heat-conducting parts, which are opposite to and spaced apart along the first direction of the battery device. The first heat-conducting part is connected between the two second heat-conducting parts. Along the vertical direction, the battery cell is located above the first heat-conducting part and between the two second heat-conducting parts. The first direction is perpendicular to the vertical direction.

5. The energy storage device according to claim 4, characterized in that, There are two heat exchange structures. Along the first direction, each of the second heat-conducting parts is provided with the heat exchange structure on the side away from the battery cell.

6. The energy storage device according to claim 2, characterized in that, The battery device further includes: a base plate, which is located below the battery cell and heat-exchanges with the battery cell along the vertical direction; and a first heat-conducting part is located between the base plate and the battery cell and heat-exchanges with the base plate.

7. The energy storage device according to claim 6, characterized in that, The bottom plate has a mounting groove on the side facing the battery cell, and at least a portion of the first heat-conducting part is mounted in the mounting groove.

8. The energy storage device according to claim 2, characterized in that, The second heat-conducting part has a medium injection port, which is connected to the medium receiving cavity.

9. The energy storage device according to claim 2, characterized in that, The energy storage device further includes: heat dissipation fins, which are disposed on the heat dissipation structure.

10. The energy storage device according to claim 9, characterized in that, At least one of the outer surfaces of the heat dissipation structure and the outer surfaces of the heat dissipation fins is provided with a heat dissipation layer.

11. The energy storage device according to any one of claims 2-10, characterized in that, The battery cells and the first heat-conducting part are arranged along the vertical direction. The first heat-conducting part includes a heat-conducting body, and the heat-conducting body and the corresponding battery cell are corresponding along the vertical direction. The heat-conducting body includes a first heat-conducting segment and a second heat-conducting segment arranged and connected along the first direction of the battery device. The end face of the battery cell facing the corresponding heat-conducting body has a central heat exchange area and an edge heat exchange area arranged along the first direction. At least a portion of the first heat-conducting segment corresponds to the central heat exchange area, and at least a portion of the second heat-conducting segment corresponds to the edge heat exchange area. Along the second direction of the battery device, the width of the first heat-conducting segment is greater than the width of the second heat-conducting segment. The first direction, the second direction, and the vertical direction are perpendicular to each other.

12. The energy storage device according to claim 11, characterized in that, The first heat-conducting part includes a plurality of heat-conducting elements, which are arranged sequentially along the first direction, and the plurality of heat-conducting elements are respectively in heat exchange cooperation with the corresponding battery cells.

13. The energy storage device according to claim 11, characterized in that, The heat-conducting structure comprises multiple structures arranged sequentially along the second direction. The battery cell includes multiple rows of battery bars arranged sequentially along the second direction, with each row of battery bars corresponding to one of the heat-conducting structures.

14. The energy storage device according to any one of claims 1-10, characterized in that, The energy storage device further includes a drive pump, which is located on the communication path between the heat dissipation structure and the heat exchange structure, and is used to drive the heat exchange medium to circulate within the circulation path.

15. The energy storage device according to claim 14, characterized in that, The drive pump is configured to drive the heat exchange medium to circulate within the circulation path when the average temperature of the battery cells in the energy storage device is greater than the ambient temperature.

16. The energy storage device according to any one of claims 1-10, characterized in that, The battery cell is a sodium-ion battery cell.

17. An energy storage system, characterized in that, It includes an energy conversion system and an energy storage device as described in any one of claims 1-16, wherein the energy conversion system and the energy storage device are connected to perform energy conversion on current input to or output from the energy storage device.

18. A charging network, characterized in that, include: Charging stations; The energy storage device according to any one of claims 1-16 or the energy storage system according to claim 17, wherein the energy storage device is used to provide electrical energy to the charging pile.

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