Energy storage device, energy storage system and charging network

Abstract

The embodiment of the present application provides a kind of energy storage device, energy storage system and charging network.The energy storage device includes: box, with multiple box walls, multiple box walls enclose containing space, multiple box walls include first box wall;At least one battery cell is located in the containing space, and the battery cell includes battery monomer assembly and heat conduction component, the battery monomer assembly includes multiple battery monomers arranged, and the battery monomer includes shell;Heat conduction component includes heat conduction piece and heat pipe connected with heat conduction piece, heat pipe has evaporating end and condensing end, heat conduction piece is in contact with shell, heat pipe is installed on first box wall, and evaporating end is in contact with heat conduction piece and condensing end is located outside the box.Thereby, the heat generated by battery monomer is transferred to heat pipe through heat conduction piece, and heat is dissipated to external environment through heat pipe.Therefore, even if not setting up cooling unit, the heat management of energy storage device can be realized, and the operation and maintenance cost brought by cooling unit can be saved.

Description

Technical Field

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

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0003] Energy storage systems typically comprise multiple energy storage devices, including individual battery cells and a thermal management system for managing the thermal state of these cells. In related technologies, the thermal management system includes water-cooled units, liquid-cooled components, and battery heat exchangers. The thermal management system itself consumes energy and incurs operation and maintenance costs. Reducing the thermal management costs of energy storage devices is one of the key research topics. Utility Model Content

[0004] To address the aforementioned technical problems, embodiments of this application provide an energy storage device, an energy storage system, and a charging network to reduce the thermal management costs of the energy storage device.

[0005] The embodiments of this application are implemented through the following technical solutions.

[0006] A first aspect of this application provides an energy storage device, comprising: a housing having multiple housing walls forming a receiving space, the multiple housing walls including a first housing wall; at least one battery cell located in the receiving space, the battery cell including a battery cell assembly and a heat-conducting assembly, the battery cell assembly including multiple battery cells arranged in an array, the battery cell including a housing; the heat-conducting assembly including a heat-conducting element and a heat pipe connected to the heat-conducting element, the heat pipe having an evaporation end and a condensation end, the heat-conducting element contacting the housing, the heat pipe being mounted on the first housing wall, and the evaporation end contacting the heat-conducting element and the condensation end located outside the housing.

[0007] Because the heat-conducting component is in contact with the outer casing, the evaporation end is in contact with the heat-conducting component, and the condensation end is located outside the casing, the heat-conducting component can transfer heat from the battery cells to the evaporation end. The evaporation end absorbs the heat from the battery cells, and the liquid inside the heat pipe evaporates into gas, flowing to the condensation end, thus dissipating the heat to the outside of the casing, achieving heat dissipation (thermal management) for the energy storage device. This heat dissipation method does not require energy consumption like water-cooled units, thus reducing energy costs associated with thermal management. Moreover, thermal management of the battery cells in the energy storage device can be achieved even without a cooling unit, which helps save space for accommodating cooling unit components and improves the volumetric energy density of the energy storage device. In addition, since the heat-conducting component does not require moving mechanical parts, it is less prone to wear and mechanical failure, resulting in low maintenance costs. Furthermore, because the temperature of the battery cells is higher than the ambient temperature, the risk of condensation forming inside the energy storage device casing is reduced.

[0008] In some embodiments, the heat-conducting element includes a plurality of heat-conducting segments, the plurality of heat-conducting segments including a first heat-conducting segment and a second heat-conducting segment connected together. In the same battery cell, the first heat-conducting segment extends along the arrangement direction of the battery cells in the battery cell assembly and is in surface contact with the outer casing of the plurality of battery cells. The second heat-conducting segment extends along a direction intersecting the arrangement direction and is in surface contact with the evaporation end.

[0009] Since the first heat-conducting section is in surface contact with the outer casing of multiple battery cells, the heat from the multiple battery cells can be directly and effectively transferred to the first heat-conducting section. The first heat-conducting section then transfers the heat to the second heat-conducting section connected to it. Since the second heat-conducting section is in surface contact with the evaporation end, the heat can be effectively transferred to the evaporation end, and then to the condensation end, thereby dissipating the heat to the outside of the housing, thus achieving heat dissipation and improving the heat dissipation efficiency of the energy storage device.

[0010] In some embodiments, the first housing wall has a mounting through hole that extends through the first housing wall along the wall thickness direction. The heat pipe includes a first pipe section, a second pipe section, and an intermediate pipe section. The first pipe section, the intermediate pipe section, and the second pipe section are connected in sequence and internally communicate with each other. The evaporation end is located in the first pipe section, and the condensation end is located in the second pipe section. The heat pipe is embedded in the mounting through hole. The first pipe section is located in the receiving space and the evaporation end is in contact with the surface of the second heat-conducting section. The second pipe section is located outside the housing so that the condensation end is exposed to the external environment. Along the direction of gravity, the condensation end is higher than the evaporation end.

[0011] Because the first housing wall has mounting holes that penetrate the wall along its thickness, the evaporator end of the heat pipe can be easily connected to the heat-conducting component, while the condenser end is located outside the housing. Since the first pipe section is located within the containment space and the evaporator end is in contact with the second heat-conducting section, and the second pipe section is located outside the housing, exposing the condenser end to the external environment, heat from the battery cells can be transferred to the outside of the housing for heat dissipation. Furthermore, because the condenser end is higher than the evaporator end along the direction of gravity, the evaporator end absorbs heat from the battery cells, the liquid inside the heat pipe evaporates into gas, flows to the condenser end for heat dissipation, the gas becomes liquid again, and flows back to the evaporator end to absorb heat under gravity, thus achieving a cycle.

[0012] In some embodiments, the heat pipe is formed in the following shape: at least one of the first pipe segment and the second pipe segment is inclined relative to the wall surface of the first housing wall; or, the heat pipe is formed in the following shape: at least one of the first pipe segment and the second pipe segment is disposed along the wall surface of the first housing wall.

[0013] This increases the design freedom of heat pipe shapes.

[0014] In some embodiments, the number of heat pipes in the same heat-conducting assembly is multiple, and the evaporation end of each heat pipe is in contact with the same heat-conducting surface.

[0015] Therefore, the energy storage system can dissipate heat through multiple heat pipes, thereby improving the heat dissipation efficiency of the energy storage device.

[0016] In some embodiments, the heat pipe includes a vapor chamber.

[0017] Not only do vapor chambers have high heat dissipation performance, which can improve the heat dissipation efficiency of energy storage systems, but their small size can also reduce the overall size of energy storage devices.

[0018] In some embodiments, in the same battery cell, the number of first thermal conductive sections is at least two, and the battery cell assembly is provided with first thermal conductive sections on both sides along a first direction. The first direction intersects the arrangement direction of the battery cells. The second thermal conductive section extends along the first direction and is connected to the first thermal conductive section at both ends along the first direction. The plurality of thermal conductive sections also include a third thermal conductive section disposed opposite to the second thermal conductive section along the arrangement direction of the battery cells. The third thermal conductive section extends along the first direction and is connected to the first thermal conductive section at both ends along the first direction. The third thermal conductive section and the side of the battery cell assembly away from the second thermal conductive section are in surface contact with each other.

[0019] Since both the first and third heat-conducting sections are in contact with the surface of the battery cell, the contact area between the heat-conducting component and the battery cell is increased, which can more effectively transfer the heat of the battery cell to the heat-conducting component and then to the heat pipe, thereby improving the heat dissipation efficiency of the energy storage device.

[0020] In some embodiments, in the same battery cell, the battery cells are arranged with their large surfaces facing each other, and the large surface is the housing surface with the largest area in the housing; the battery cell also includes at least two end plates and at least one restraining member. Along the arrangement direction of the battery cells in the same battery cell, the battery cell assembly has end plates on both sides, and the restraining member and the heat-conducting member are arranged around the battery cell assembly and the end plates. The surrounding direction of the restraining member is the same as the surrounding direction of the heat-conducting member, and the heat-conducting member and the restraining member are staggered.

[0021] Because the battery cell assembly has end plates on both sides, and the restraints are arranged around the battery cell assembly and end plates, the end plates and restraints can fix the relative positions of multiple battery cells and keep them in close contact with each other, which is beneficial for assembling them as a whole into the energy storage device's housing. Since the restraints are arranged in the same direction as the heat-conducting components, and the heat-conducting components are staggered from the restraints, the arrangement of the restraints and heat-conducting components is convenient, reducing the probability of interference between them and also reducing the risk of the heat-conducting components being broken due to the expansion force of the battery cells.

[0022] In some embodiments, the restraint is configured as a strip, and there are multiple restraints in the same battery cell. The multiple restraints are spaced apart, and the heat-conducting element is arranged between adjacent restraints.

[0023] By setting two or more restraints, the restraint force on the battery cell assembly can be increased, reducing the significant change in the assembly size of the battery cell caused by the expansion of the battery cell. By arranging the heat-conducting component between adjacent restraints, contact heat transfer can be achieved while more effectively reducing the risk of the heat-conducting component being pulled off by the expansion force of the battery cell.

[0024] In some embodiments, the plurality of heat-conducting segments further include a fourth heat-conducting segment and a fifth heat-conducting segment connected together. In the same battery cell, the fourth heat-conducting segment is in contact with the outer casing surface of the plurality of battery cells, and the plane on which the outer casing contact surface of the fourth heat-conducting segment is located intersects the plane on which the outer casing contact surface of the first heat-conducting segment is located and the plane on which the outer casing contact surface of the third heat-conducting segment is located, respectively; the fifth heat-conducting segment is in surface contact with the evaporation end.

[0025] Because the fourth heat-conducting section is in contact with the outer casing surfaces of multiple battery cells, the heat from these cells can be directly and effectively transferred to it. The fourth heat-conducting section then transfers the heat to the connected fifth heat-conducting section. Since the fifth heat-conducting section is in surface contact with the evaporation end, it effectively transfers heat to the evaporation end, and subsequently to the condensation end, thus achieving heat dissipation and improving the heat dissipation efficiency of the energy storage device. Because the plane containing the outer casing contact surface of the fourth heat-conducting section intersects with the planes containing the outer casing contact surfaces of the first and third heat-conducting sections, the fourth, first, and third heat-conducting sections each contact different surfaces of the outer casing. This increases the contact area between the heat-conducting components and the outer casing, enabling more effective transfer of heat from the battery cell assembly to the heat-conducting components and further improving the heat dissipation efficiency of the energy storage device.

[0026] In some embodiments, the battery cell further includes electrode terminals and a pressure relief mechanism, which are disposed in the housing, and the heat-conducting element and the portion of the housing that avoids the electrode terminals and the pressure relief mechanism are in surface contact with each other.

[0027] Because the heat-conducting component is in surface contact with the housing at a location that avoids the electrode terminals and pressure relief mechanism, the heat-conducting component can avoid these components, allowing them to function properly. Furthermore, the heat-conducting component only needs to contact the housing surface at a location that avoids the electrode terminals and pressure relief mechanism; therefore, the heat-conducting component can be flexibly arranged according to the structure of the battery cell.

[0028] In some embodiments, the thermally conductive element is a sheet-like component that is bonded to the housing by thermally conductive adhesive.

[0029] Because the heat-conducting component is a sheet-like component, its overall size is small, which reduces the negative impact of the heat-conducting component on the volumetric energy density and mass energy density of the energy storage device.

[0030] In some embodiments, the in-plane thermal conductivity of the heat-conducting element is in the range of 1000 W / (m·K) to 5300 W / (m·K).

[0031] Because the heat-conducting component has good in-plane thermal conductivity, it can effectively transfer the heat of the battery cell to the evaporation end along the extension direction of the heat-conducting component, and then effectively transfer the heat to the condensation end, thus achieving rapid and efficient heat dissipation of the battery cell in the energy storage device.

[0032] In some embodiments, the thermal conductive material includes any one of graphene, carbon nanotubes, diamond, and boron nitride.

[0033] Because graphene, carbon nanotubes, diamond, or boron nitride have good thermal conductivity, they can effectively conduct the heat of the battery cells to the evaporation end, and then effectively transfer the heat to the condensation end, thereby effectively achieving heat dissipation of the energy storage device.

[0034] In some embodiments, the material of the first housing wall includes metal; the heat-conducting component is bonded to the first housing wall by thermally conductive adhesive.

[0035] Because the thermally conductive component is bonded to the first housing wall with thermally conductive adhesive, the heat from the battery cell can not only be transferred to the heat pipe through the thermally conductive component and dissipated through the heat pipe, but also transferred to the first housing wall through the thermally conductive component and dissipated through the first housing wall. Furthermore, because the metal material has good thermal conductivity and heat dissipation performance, and the thermally conductive component is tightly attached to the first housing wall with thermally conductive adhesive, heat can be efficiently transferred to the first housing wall through the thermally conductive component and diffused along the wall surface of the first housing wall, increasing the contact area between heat and air, and dissipating heat more effectively outside the energy storage device.

[0036] In some embodiments, the plurality of housing walls include a top wall and a bottom wall disposed opposite each other along the height direction of the energy storage device, and a plurality of side walls located between the top wall and the bottom wall. The plurality of side walls include a first housing wall. The number of battery cells is plurality of, and the first housing wall is perpendicular to the arrangement direction of the battery cells in the same battery cell.

[0037] Therefore, when the energy storage device has multiple battery cells, the heat-conducting components of each battery cell can contact the first housing wall without interfering with each other, thereby achieving heat dissipation for the multiple battery cells. Moreover, using the side walls of the housing to install the heat-conducting components facilitates the placement and arrangement of the battery cells within the housing.

[0038] In some embodiments, the multiple side walls also include a second housing wall. Along the arrangement direction of the battery cells in the same battery cell, the first housing wall and the second housing wall are disposed opposite to each other, and the second housing wall has a door opening and is connected to a door.

[0039] Since the second enclosure wall has a door opening and is connected to a door, the components inside the enclosure can be assembled, disassembled, or repaired through the door opening. Moreover, the heat pipe is installed on the first enclosure wall, which does not have a door opening, thus reducing the impact of opening and closing the door on the heat conduction components.

[0040] In some embodiments, the number of battery cells is multiple, and the multiple battery cells are arranged along a first direction to form a battery cell array. The energy storage device includes one or more battery clusters, each battery cluster includes multiple battery cell arrays, and each battery cell array is stacked along a second direction. The first direction, the second direction, and the arrangement direction of the battery cells in the same battery cell intersect each other, and the second direction is consistent with the height direction of the energy storage device.

[0041] Therefore, the energy storage device can include multiple battery clusters, and the battery cells in the battery clusters can be arranged in multiple layers, with multiple battery cells arranged in each layer. This is beneficial to improving the energy density of the energy storage device, and also allows the heat pipes in each battery cell to be installed on the first housing wall.

[0042] A second aspect of this application provides an energy storage system, which includes the energy storage device and power conversion device described in the first aspect, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0043] This helps reduce the energy consumption cost and operation and maintenance cost of energy storage systems.

[0044] A third aspect of this application provides a charging network, which includes a charging pile and an energy storage device described in the first aspect or an energy storage system described in the second aspect, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0045] This helps reduce the energy consumption and operation and maintenance costs of the charging network, and in turn, reduces the cost of using charging stations. Attached Figure Description

[0046] Figure 1 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0047] Figure 2 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0048] Figure 3 A schematic diagram of the structure of an energy storage device without showing the second housing wall and heat pipe, provided for some embodiments of this application;

[0049] Figure 4 A schematic diagram of the energy storage device from another angle, without showing one sidewall, provided for some embodiments of this application;

[0050] Figure 5 This is a schematic diagram of the structure of a battery cell array provided in some embodiments of this application;

[0051] Figure 6 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0052] Figure 7 for Figure 6 A schematic diagram of the AA cross-section;

[0053] Figure 8 for Figure 6 BB cross-sectional diagram;

[0054] Figure 9 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application;

[0055] Figure 10 Schematic diagram of the structure of the battery cell provided in some embodiments of this application

[0056] Figure 11 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0057] Explanation of reference numerals in the attached figures

[0058] 1000, Energy storage system; 100, Energy storage device; 200, Power conversion device; 2000, Charging network; 2100, Charging pile; 3000, Power generation device; 101, Container; 1011, First container wall; 1012, Second container wall; 1013, Top wall; 1014, Bottom wall; 1015, Door; 1016, Energy compartment; 1017, Electrical compartment; 1018, Storage space; 102, Battery cluster; 103, Fire protection power distribution module; 104, Battery management module; 105, Support frame; 106, Partition; 10A, Battery unit array; 10, Battery unit; 11. Battery cell assembly; 12. Thermal conductive assembly; 12M. Thermal conductive element; 12a. First thermal conductive section; 12b. Second thermal conductive section; 12c. Third thermal conductive section; 12e. Fourth thermal conductive section; 12f. Fifth thermal conductive section; 12N. Heat pipe; 12p. Evaporation end; 12q. Condensation end; 13. End plate; 14. Binding element; 110. Battery cell; 111. Electrode terminal; 112. Housing; 1121. First housing wall; 1123. Third housing wall; 113. Tab; 114. Electrode assembly; 115. Pressure relief mechanism; X. First direction; Y. Second direction; Z. Third direction. Detailed Implementation

[0059] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of this application, the technical terms "first," "second," "third," "fourth," "fifth," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0062] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application may be combined with each other to form new technical solutions.

[0063] In the description of the embodiments 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, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0064] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "projection" refers to an orthographic projection in which parallel projection lines are perpendicular to the projection plane.

[0068] The following is a detailed description of this application.

[0069] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0070] Energy storage systems typically comprise multiple energy storage devices, each consisting of individual battery cells and a thermal management system for thermal management of these cells. In related technologies, the thermal management system includes water-cooled units, liquid-cooled components, and battery heat exchangers. The thermal management system itself consumes energy and incurs operation and maintenance costs. Research has shown that passive cooling can be used to dissipate heat from the energy storage devices. Furthermore, thermally conductive components can be connected to the individual battery cells within the energy storage device, with a portion of the component extending outside the enclosure. These components dissipate the heat generated by the battery cells to the outside of the enclosure, thus achieving passive cooling and reducing the cost of the energy storage device.

[0071] Based on this design concept, this application provides an energy storage device, which includes: a housing having multiple housing walls that enclose a receiving space, the multiple housing walls including a first housing wall; at least one battery cell located in the receiving space, the battery cell including a battery cell assembly and a heat-conducting assembly, the battery cell assembly including multiple battery cells arranged in an array, the battery cell including a shell; the heat-conducting assembly including a heat-conducting element and a heat pipe connected to the heat-conducting element, the heat pipe having an evaporation end and a condensation end, the heat-conducting element contacting the shell, the heat pipe being installed on the first housing wall, and the evaporation end contacting the heat-conducting element and the condensation end located outside the housing.

[0072] Because the heat-conducting component is in contact with the outer casing, the evaporation end is in contact with the heat-conducting component, and the condensation end is located outside the casing, the heat-conducting component can transfer heat from the battery cells to the evaporation end. The evaporation end absorbs the heat from the battery cells, and the liquid inside the heat pipe evaporates into gas, flowing to the condensation end, thus dissipating the heat to the outside of the casing, achieving heat dissipation (thermal management) for the energy storage device. This heat dissipation method does not require energy consumption like water-cooled units, thus reducing energy costs associated with thermal management. Moreover, thermal management of the battery cells in the energy storage device can be achieved even without a cooling unit, which helps save space for accommodating cooling unit components and improves the volumetric energy density of the energy storage device. In addition, since the phase change heat conduction device does not require the movement of mechanical parts, it is less prone to wear and mechanical failures, resulting in low maintenance costs. Furthermore, because the temperature of the battery cells is higher than the ambient temperature, the risk of condensation forming inside the energy storage device casing is reduced.

[0073] The energy storage devices provided in this application embodiment may include energy storage containers, energy storage cabinets, etc. This application embodiment also provides an energy storage system, which includes a power conversion device and an energy storage device, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0074] This application also provides a charging network, which includes charging piles and energy storage devices or energy storage systems, wherein the energy storage devices are used to provide electrical energy to the charging piles.

[0075] The following description uses an energy storage container as an example of the energy storage device in this application.

[0076] like Figure 1 As shown in the figure, this application provides an energy storage system 1000. The energy storage system 1000 includes an energy storage device 100 and a power conversion device 200. The power conversion device 200 can be electrically connected to a power generation device 3000 to convert the electrical power provided by the power generation device 3000. The energy storage device 100 is electrically connected to the power conversion device 200, and the power conversion device 200 converts the electrical energy provided by the power generation device 3000 and then stores it in the energy storage device 100.

[0077] A power conversion device 200 is used to connect between the power generation device 3000 and the energy storage device 100. The power generation device 3000 generates electrical energy and stores the generated electrical energy in the energy storage device 100 via the power conversion device 200. Specifically, the power generation device 3000 can be a solar panel, a hydroelectric power generation device, a thermal power generation device, etc. This document does not limit the specific type of the power generation device 3000.

[0078] like Figure 2As shown in the figure, this application embodiment also provides a charging network 2000. The charging network 2000 includes an energy storage device 100 and two charging piles 2100, with the energy storage device 100 providing power to the two charging piles 2100. It can be understood that in a charging network 2000, there can be one charging pile 2100, with the energy storage device 100 providing power to that charging pile 2100; or there can be multiple charging piles 2100, with the energy storage device 100 providing power to multiple charging piles 2100.

[0079] The energy storage device 100 may include multiple battery devices that are electrically connected to the charging pile 2100 so that the battery devices can provide power to the charging pile 2100.

[0080] like Figure 3 and Figure 4 As shown, the energy storage device 100 may include a housing 101, and a battery cluster 102 is disposed inside the housing 101. Multiple energy storage devices 100 can be stacked, which can be stacked along the direction of gravity or stacked along a horizontal plane.

[0081] As an example, the energy storage device 100 can be an energy storage container, an energy storage cabinet, etc.

[0082] As an example, energy storage device 100 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 power stations can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 100. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 100, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas where the mains power supply cannot reach, such as remote mountainous areas and remote wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply.

[0083] In some embodiments, the energy storage device 100 includes an energy chamber 1016 and an electrical chamber 1017. One or more battery clusters 102 may be arranged in the energy chamber 1016. Each battery cluster 102 may include multiple battery cell arrays 10A, each containing multiple battery cells 10. These battery cells 10 may be connected in series or in parallel to increase the voltage or capacity of the energy storage device 100. When the energy storage device 100 includes multiple battery clusters 102, the multiple battery clusters 102 are connected in series or in parallel to increase the voltage or capacity of the energy storage device 100.

[0084] In some embodiments, the battery cell array 10A is a battery device.

[0085] In some embodiments, a battery apparatus may include one or more battery cells 10, each of which may include a battery cell assembly 11 for providing voltage and capacity. The battery cell assembly 11 may include multiple battery cells 110 connected in series, parallel, or in a mixed configuration via a busbar.

[0086] In some embodiments, the battery cell assembly 11 is typically formed by arranging a plurality of battery cells 110.

[0087] As an example, the battery cell assembly 11 can be a battery module, which is formed by arranging and fixing multiple battery cells 110 together. As an example, the battery module can be formed by binding multiple battery cells 110 together with cable ties (e.g., restraint 14).

[0088] In some embodiments, the energy storage device 100 may include a battery management module 104 and a fire protection power distribution module 103 located in the electrical compartment 1017. The battery management module 104 includes a thermal management module, a main control module, and a central control module. The fire protection power distribution module 103 includes a power distribution module and a fire protection system, etc.

[0089] As an example, the main control module can serve as the battery management unit for battery cluster 102, used to monitor and manage battery cluster 102. The main control module can monitor information such as current, voltage, power, or temperature of battery cluster 102. For example, it can control the charging and discharging current and voltage of battery cluster 102. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0090] As an example, the central control module can serve as the battery management unit of the energy storage device 100, used to monitor and manage the energy storage device 100. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 100. For example, it can control the charging and discharging current and voltage of the energy storage device 100. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module. Exemplarily, the central control module may include input / output devices for control, such as switches and panels, which can be arranged in a central control box.

[0091] As an example, the power distribution module can be used to distribute power to the electrical devices of the energy storage device 100. Exemplarily, the power distribution module may include input / output devices for control, such as switches, panels, etc., which may be arranged in a distribution box or distribution cabinet.

[0092] As an example, the fire protection system includes fire protection components, control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system 1000.

[0093] In this embodiment of the application, the battery cell 110 can be a secondary battery. A secondary battery refers to a battery cell 110 that can be used again after being discharged by recharging to activate the active materials.

[0094] The battery cell 110 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.

[0095] Battery cell 110 generally includes electrode assembly 114 (see Figure 7 The electrode assembly 114 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 110, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between them while allowing active ions to pass through.

[0096] Below, refer to Figures 3 to 11 Some embodiments of this application will be described in detail.

[0097] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X represents "first direction X", the direction of arrow Y represents "second direction Y", and the direction of arrow Z represents "third direction Z", wherein the third direction Z is the same as the arrangement direction of the battery cells 110 in the same battery cell 10. The first direction X, the second direction Y, and the third direction Z intersect each other and are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. In some embodiments, the second direction Y is consistent with the height direction of the energy storage device. The height direction refers to the direction perpendicular to the support surface when the energy storage device is stably placed on the support surface.

[0098] The first aspect of this application provides an energy storage device 100, such as... Figure 3 , Figure 4 and Figure 7As shown, the energy storage device 100 includes: a housing 101 having multiple housing walls that enclose a receiving space 1018, the multiple housing walls including a first housing wall 1011; at least one battery cell 10 located in the receiving space 1018, the battery cell 10 including a battery cell assembly 11 and a heat-conducting assembly 12, the battery cell assembly 11 including multiple battery cells 110 arranged in an array, the battery cell 110 including a housing 112; the heat-conducting assembly 12 including a heat-conducting element 12M and a heat pipe 12N connected to the heat-conducting element 12M, the heat pipe 12N having an evaporation end 12p and a condensation end 12q, the heat-conducting element 12M contacting the housing 112, the heat pipe 12N mounted on the first housing wall 1011, and the evaporation end 12p contacting the heat-conducting element 12M and the condensation end 12q located outside the housing 101.

[0099] In some embodiments, such as Figure 3 and Figure 4 As shown, the housing 101 includes multiple housing walls that surround and form a receiving space 1018, where the battery unit 10 is located. In some specific embodiments, the energy storage device 100 is an energy storage container, and the housing 101 is the container body of the energy storage container. In other specific embodiments, the energy storage device 100 is an energy storage cabinet, and the housing 101 is the cabinet body of the energy storage cabinet.

[0100] For ease of explanation, one of the multiple box walls will be named "the first box wall".

[0101] Optionally, the first housing wall 1011 can be the top wall, bottom wall, or side wall of the housing 101. In a specific embodiment, the first housing wall can be the side wall of the housing 101.

[0102] In some embodiments, such as Figure 4 As shown, the housing 101 has a doorway. The energy storage device 100 may also include a door 1015, which is connected to the housing wall surrounding the doorway and can be opened and closed relative to the doorway. The first housing wall 1011 and the housing wall with the doorway are two housing walls. In some embodiments, these two housing walls can be two opposite housing walls. Of course, the first housing wall 1011 and the housing wall with the doorway can also be adjacent housing walls.

[0103] In some embodiments, the second housing wall 1012 has a door opening, and the second housing wall 1012 is disposed opposite to the first housing wall 1011. Further, along the arrangement direction of the battery cells 110 in the same battery cell 10, the second housing wall 1012 is disposed opposite to the first housing wall 1011.

[0104] In some embodiments, the material of the first enclosure wall 1011 includes a metal material. More specifically, the first enclosure wall 1011 can be made of at least one of stainless steel plate, aluminized magnesium steel plate, or steel plate. In some embodiments, aluminized magnesium steel plate is selected to make the enclosure wall to balance the structural characteristics, corrosion resistance, and thermal conductivity of the enclosure.

[0105] In some embodiments, such as Figure 3 As shown, the enclosure 101 forms a receiving space 1018, which is used to house the components of the energy storage device 100. The receiving space 1018 provided by the enclosure 101 can be broadly divided into an energy compartment 1016 and an electrical compartment 1017. The energy compartment 1016 is mainly used to house the battery cluster 102 (including multiple unit arrays), and the electrical compartment 1017 is mainly used to house the fire protection power distribution module 103 and the battery management module 104. The fire protection power distribution module 103 includes a power distribution module and / or a fire protection module, and the battery management module 104 includes at least one of a main control module, a central control module, and a power distribution module.

[0106] In some embodiments, the energy storage 1016 is provided with a plurality of battery clusters 102, which are connected in parallel, series or mixed connection through a busbar assembly to improve the voltage or capacity of the energy storage device 100.

[0107] In some embodiments, the battery cluster 102 includes at least one battery cell 10.

[0108] In some embodiments, the battery cluster 102 includes a plurality of battery cells 10, which are connected in series, in parallel or in a mixed manner.

[0109] In some embodiments, the energy storage device 100 may further include a separator 106 that separates different battery clusters 102.

[0110] In some embodiments, such as Figure 4 As shown, the battery cell 10 includes a battery cell assembly 11, and the battery cell assembly 11 includes a plurality of battery cells 110. Optionally, with Figure 4 As illustrated in the diagram, multiple battery cells 110 can be arranged in the left-right direction within the same battery cell assembly 11.

[0111] Optionally, the battery cell assembly 11 may include two or more battery cells 110.

[0112] In some embodiments, such as Figures 5 to 8As shown, the heat-conducting element 12M is disposed around the battery cell assembly 11. Optionally, the heat-conducting element 12M may surround the battery cell assembly 11 in a first direction X; or the heat-conducting element 12M may surround the battery cell assembly 11 in a second direction Y; or the heat-conducting element 12M may surround the battery cell assembly 11 in a third direction Z.

[0113] Optionally, the thermal conductive element 12M may surround the battery cell assembly 11, for example, the thermal conductive element 12M is annular (O-shaped); or the thermal conductive element 12M may partially surround the battery cell assembly 11, for example, the thermal conductive element 12M is U-shaped or L-shaped; or the thermal conductive element 12M may include multiple thermal conductive segments, which are in surface contact with multiple surfaces of the battery cell assembly 11.

[0114] In some embodiments, such as Figure 5 As shown, within the same projection plane projected along the second direction Y, the projection of the heat-conducting component 12M surrounds the projection of the battery cell assembly 11.

[0115] In some embodiments, the heat-conducting element 12M can be a sheet-like component. A portion of the heat-conducting element 12M can contact the casing of the battery cell 110, and another portion of the heat-conducting element 12M can contact the evaporation end 12p of the heat pipe 12N and the first housing wall 1011. Alternatively, another portion of the heat-conducting element 12M can contact the evaporation end 12p of the heat pipe 12N but not the first housing wall 1011. In some embodiments, the heat-conducting element 12M is made of graphene. Exemplarily, the heat-conducting element 12M is formed using a graphene heat dissipation film. Of course, the heat-conducting element 12M can also be made of other sheets with high thermal conductivity, such as a graphite heat dissipation film.

[0116] In some embodiments, such as Figure 7 As shown, the battery cell 110 includes a casing 112. The casing 112 can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. The battery cell 110 generally also includes an electrode assembly 114. In some embodiments, the casing 112 can be a sealed structure or a non-sealed structure. As an example, when the casing 112 is a non-sealed structure, the casing 112 serves to protect the electrode assembly 114, and a sealing bag can also be included between the casing 112 and the electrode assembly 114. The sealing bag is used to encapsulate the electrode assembly 114 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the casing 112 is a sealed structure, it is used to encapsulate the electrode assembly 114 and the electrolyte, etc.

[0117] In some embodiments, such as Figure 7As shown, the battery cell 110 includes an electrode assembly 114. The electrode assembly 114 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 110, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0118] In some embodiments, the electrode assembly 114 is provided with tabs 113, which can conduct current from the electrode assembly 114. The tabs 113 include a positive tab and a negative tab.

[0119] As an example, the battery cell 110 can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells. For ease of explanation, in... Figures 3 to 10 The illustrated embodiment uses a prismatic battery cell as an example for explanation. Figure 11 The embodiments shown are illustrated using a blade battery cell as an example.

[0120] In some embodiments, such as Figure 7 As shown, at least one electrode terminal 111 is provided on the outer casing 112, and the electrode terminal 111 is electrically connected to the tab 113. The electrode terminal 111 can be directly connected to the tab 113, or it can be indirectly connected to the tab 113 through an adapter. The electrode terminal 111 can be provided on the top shell wall, side shell wall or bottom shell wall of the outer casing 112.

[0121] In some embodiments, a pressure relief mechanism 115 is provided on the housing 112. The pressure relief mechanism 115 is used to release the internal pressure of the battery cell 110. The pressure relief mechanism 115 may be provided on the top housing wall (first housing wall 1121), side housing wall or bottom housing wall of the housing 112.

[0122] Optionally, the electrode terminal 111 and the pressure relief mechanism 115 can be located on the housing wall of different or the same housing 112.

[0123] In some embodiments, such as Figures 6 to 11 As shown, the heat-conducting component 12M can be connected to any of the housing walls of the housing 112.

[0124] Optionally, the heat-conducting component 12M can be connected to the housing wall of the housing 112 that is provided with electrode terminals 111 and / or pressure relief mechanism 115, but must avoid the electrode terminals 111 and / or pressure relief mechanism 115. The heat-conducting component 12M can also be connected to the housing wall of the housing 112 that is not provided with electrode terminals 111 and / or pressure relief mechanism 115.

[0125] Optionally, the thermally conductive element 12M can be in direct or indirect contact with the housing 112. In one specific embodiment, a thermally conductive structure exists between the thermally conductive element 12M and the housing 112. Further, the thermally conductive structure is a thermally conductive adhesive.

[0126] In one specific embodiment, the heat-conducting element 12M and the housing 112 can be in surface contact.

[0127] Optionally, when the heat-conducting component 12M is in contact with the first housing wall 1011, the heat-conducting component 12M may be in direct or indirect contact with the first housing wall.

[0128] In one specific embodiment, a thermally conductive structure exists between the thermally conductive component 12M and the first housing wall. Further, the thermally conductive structure is a thermally conductive adhesive.

[0129] Optionally, the heat-conducting component 12M can be bonded to the first housing wall with thermally conductive adhesive to achieve close contact; or the heat-conducting component 12M can be snapped into the first housing wall to achieve close contact; or the heat-conducting component 12M can be pressed into the first housing wall to achieve close contact.

[0130] In one specific embodiment, the heat-conducting element 12M can be in surface contact with the first housing wall.

[0131] A heat pipe can be a closed metal tube with capillary structures (sintered powder, grooves, etc.) on its inner wall and filled with a small amount of working fluid. It can rapidly transfer heat from one end (evaporation end 12p) to the other end (condensation end 12q). For example, the liquid can be water; in this case, the pressure inside the heat pipe can be reduced to a vacuum to bring the boiling point of water to around 45°C (close to the design operating temperature of a single battery cell). Alternatively, the liquid can be a fluorinated liquid; in this case, the pressure inside the heat pipe can be increased to over 1 MPa (the specific value depends on the type of fluorinated liquid), also to raise the boiling point of the fluorinated liquid to around 45°C.

[0132] In the embodiments of this application, commercially available heat pipes can be used, or self-made heat pipes can be used, as long as they can achieve surface contact with the heat-conducting component and transfer the heat of the heat-conducting component to the outside of the box, there are no particular restrictions.

[0133] In some embodiments, such as Figure 5 or Figure 6 As shown, the heat-conducting element 12M and the evaporation end 12p of the heat pipe 12N are in surface contact with each other.

[0134] In some embodiments, thermally conductive adhesive is provided between the thermally conductive element 12M and the heat pipe 12N, and they are bonded together by the thermally conductive adhesive.

[0135] In some embodiments, the heat pipe 12N can be a cylinder or a prism, or of course, other shapes.

[0136] Optionally, such as Figure 6 As shown, heat pipe 12N can extend in one direction; as Figure 9 or Figure 10 As shown, multiple pipe sections can also be bent relative to each other to form a heat pipe 12N.

[0137] In some specific embodiments, the heat-conducting element 12M is spaced apart from the housing 101, the evaporation end 12p of the heat pipe 12N is in contact with the heat-conducting element 12M, and the condensation end 12q is located outside the housing 101. Thus, the heat of the battery cell 110 can be transferred through the heat-conducting element 12M to the heat pipe 12N and then dissipated outside the housing 101.

[0138] In some other specific embodiments, the heat-conducting element 12M is in contact with the first housing wall 1011 and the evaporation end 12p of the heat pipe 12N disposed on the first housing wall 1011. The condensation end 12q of the heat pipe 12N is located outside the housing 101. Thus, the heat of the battery cell 110 can be transferred to the heat pipe 12N through the heat-conducting element 12M and then dissipated outside the housing 101, or it can be directly transferred to the first housing wall 1011 through the heat-conducting element 12M and dissipated through the first housing wall 1011.

[0139] Since the heat-conducting component 12M is in contact with the outer casing 112, the evaporation end 12p is in contact with the heat-conducting component 12M, and the condensation end 12q is located outside the housing 101, the heat-conducting component 12M can transfer the heat of the battery cell 110 to the evaporation end 12p. The evaporation end 12p absorbs the heat of the battery cell, and the liquid in the heat pipe 12N evaporates into gas, flowing to the condensation end 12q, thereby dissipating the heat to the outside of the housing 101, achieving heat dissipation (thermal management) of the energy storage device 100. This heat dissipation method does not require energy consumption like water-cooled units, thus reducing the energy consumption cost caused by thermal management. Moreover, even without a cooling unit, thermal management of the battery cells 110 in the energy storage device 100 can be achieved, which helps save space in the energy storage device 100 used to arrange components related to the cooling unit, and helps improve the volumetric energy density of the energy storage device 100. In addition, since the heat-conducting component 12 does not require the operation of mechanical moving parts, it is less prone to wear and mechanical failure, resulting in low maintenance costs. Furthermore, since the temperature of the battery cell 110 is higher than the ambient temperature, the risk of condensation in the housing 101 of the energy storage device 100 is reduced.

[0140] In some embodiments, such as Figures 5 to 8 and Figure 11As shown, the heat-conducting component 12M includes multiple heat-conducting segments, including a first heat-conducting segment 12a and a second heat-conducting segment 12b connected together. In the same battery cell 10, the first heat-conducting segment 12a extends along the arrangement direction of the battery cells 110 in the battery cell assembly 11 and is in surface contact with the outer shell 112 of the multiple battery cells 110. The second heat-conducting segment 12b extends along a direction intersecting the arrangement direction and is in surface contact with the evaporation end 12p.

[0141] In some embodiments, such as Figure 8 As shown, the multiple heat-conducting sections include a first heat-conducting section 12a and a second heat-conducting section 12b that are connected and bent relative to each other.

[0142] In some embodiments, the first thermally conductive section 12a may be connected to the bottom of the battery cell assembly 11 (e.g., Figure 6 (as shown below), top (e.g.) Figure 6 (as shown on the upper side) or side (e.g.) Figure 8 The upper or lower side (as shown) is in contact. In a specific embodiment, the first thermally conductive section 12a contacts the side of the battery cell assembly 11 (e.g., the upper or lower side). Figure 8 (The upper or lower side shown) is in contact.

[0143] In some embodiments, such as Figure 5 As shown, there are multiple battery cells 10, which can be arranged along a first direction X, a second direction Y, or the arrangement direction of the individual battery cells 110 within the same battery cell 10. In one specific embodiment, the multiple battery cells 10 can be arranged along the first direction X.

[0144] The first heat-conducting section 12a may be in surface contact with the outer shell 112 of some of the battery cells 110 in the battery cell assembly 11, or the first heat-conducting section 12a may be in surface contact with the outer shell 112 of all the battery cells 110 in the battery cell assembly 11.

[0145] The shape of the surface of the first heat-conducting section 12a perpendicular to the thickness direction can be rectangular. The side in the direction of the battery cell arrangement can be a long side, or a short side, or both sides can be of equal length.

[0146] In this embodiment, the contact area between the first heat-conducting section 12a and the outer casing 112 is not specifically limited, but can be limited according to the heat dissipation requirements of the battery cell 10, the thermal conductivity parameters of the heat-conducting component 12M, and the heat dissipation parameters of the heat pipe 12N. The contact area can be adjusted by adjusting the width of the portion of the heat-conducting component 12M that contacts the outer casing 112.

[0147] In some embodiments, such as Figure 6 , Figure 7 , Figure 11As shown, along the second direction Y, the two ends of the first heat-conducting section 12a do not extend beyond the two end edges of the outer casing 112. In other words, the width of the first heat-conducting section 12a (in-plane width direction perpendicular to the length direction) does not exceed the dimension of the outer casing 112 it contacts in that direction.

[0148] There may be a small gap between the second heat-conducting section 12b and the battery cell assembly 11. This gap can be determined by the distance between the battery cell assembly 11 and the first housing wall 1011.

[0149] In some embodiments, such as Figure 5 and 6 As shown, along the second direction Y, the two ends of the second heat-conducting section 12b do not extend beyond the two end edges of the outer casing 112. In other words, the width of the second heat-conducting section 12b (in-plane width direction perpendicular to the length direction) does not exceed the dimension of the outer casing 112 it faces in that direction. Of course, the width of the second heat-conducting section 12b can be increased to be wider than the width of the first heat-conducting section 12a, or the width can be increased to exceed the dimension of the outer casing 112 in that direction.

[0150] The shape of the surface of the second heat-conducting section 12b perpendicular to the thickness direction can be rectangular. The sides of the second heat-conducting section 12b along its extension direction can be long sides, short sides, or both sides of equal length. Figure 6 , Figure 8 The orientation shown is illustrated by example; the extension direction of the second heat-conducting section 12b is consistent with the first direction X. Figure 11 The orientation shown is illustrated as an example. The extension direction of the second heat-conducting section 12b is consistent with the second direction Y.

[0151] In some embodiments, the second heat-conducting section 12b extends close to the inner wall surface of the first housing wall 1011. This application embodiment does not specifically limit the contact area between the second heat-conducting section 12b and the first housing wall 1011; it can be limited according to the heat dissipation requirements of the battery cell 10, the thermal conductivity parameters of the heat-conducting component 12M, and the heat dissipation parameters of the first housing wall. The contact area can be adjusted by changing the width of the portion of the heat-conducting component 12M that contacts the first housing wall 1011. Of course, the second heat-conducting section 12b and the first housing wall 1011 can be spaced apart.

[0152] In some embodiments, such as Figure 5 or Figure 8As shown, in the same battery cell 10, within the same projection plane projected along the arrangement direction of the battery cells 110, the projection of the second heat-conducting section 12b overlaps with the projection of the outer casing 112 of the battery cell 110. Projected along the arrangement direction onto the same projection plane, the projection of the second heat-conducting section 12b overlaps with the projection of the outer casing 112 of the battery cell 110. The second heat-conducting section 12b is in surface contact with the first housing wall 1011. Therefore, the second heat-conducting section 12b can be arranged using the gap between the battery cell assembly 11 and the first housing wall 1011, without causing a decrease in the volumetric energy density of the energy storage device 100, and can achieve contact heat conduction with the first housing wall 1011 with a simple structure.

[0153] In one specific embodiment, the heat-conducting element 12M may be composed of a first heat-conducting section 12a and a second heat-conducting section 12b. That is, the heat-conducting element 12M is formed in an L-shape, and the second heat-conducting section 12b is bent relative to the first heat-conducting section 12a toward the side where the battery cell assembly is located and contacts the surface of the first housing wall 1011.

[0154] In another specific embodiment, the heat-conducting element 12M may be composed of two first heat-conducting sections 12a and a second heat-conducting section 12b connected between the two first heat-conducting sections 12a. That is, the heat-conducting element 12M may be formed in a U-shape, and the second heat-conducting section 12b bends relative to the two first heat-conducting sections 12a toward the side where the battery cell assembly is located and contacts the surface of the first housing wall 1011.

[0155] In another specific embodiment, the heat-conducting element 12M can be formed as a continuous ring composed of multiple heat-conducting segments connected together, including a first heat-conducting segment 12a and a second heat-conducting segment 12b, and the second heat-conducting segment 12b is bent relative to the first heat-conducting segment 12a toward the side where the battery cell assembly is located.

[0156] There are no specific limitations on whether the second heat-conducting section 12b and the evaporation end 12p are in surface contact with each other, as long as the second heat-conducting section 12b and the evaporation end 12p can exchange heat.

[0157] Since the first heat-conducting section 12a is in surface contact with the outer casing 112 of the multiple battery cells 110, the heat of the multiple battery cells 110 can be directly and effectively transferred to the first heat-conducting section 12a. The first heat-conducting section 12a transfers the heat to the second heat-conducting section 12b connected to it. Since the second heat-conducting section 12b is in surface contact with the evaporation end 12p, the heat can be effectively transferred to the evaporation end 12p, and then the heat can be effectively transferred to the condensation end 12q, so that the heat is dissipated to the outside of the housing 101, thereby achieving heat dissipation and improving the heat dissipation efficiency of the energy storage device 100.

[0158] In some embodiments, such as Figure 4 and Figure 6As shown, the first housing wall 1011 has a mounting through hole that extends through the first housing wall 1011 along its thickness. The heat pipe 12N includes a first pipe section, a second pipe section, and an intermediate pipe section. The first pipe section, the intermediate pipe section, and the second pipe section are connected sequentially and internally. The evaporation end 12p is located in the first pipe section, and the condensation end 12q is located in the second pipe section. The heat pipe is embedded in the mounting through hole. The first pipe section is located in the accommodating space, and the evaporation end 12p is in contact with the surface of the second heat-conducting section 12b. The second pipe section is located outside the housing 101, so the condensation end 12q is exposed to the external environment. Along the direction of gravity, the condensation end 12q is higher than the evaporation end 12p.

[0159] This application does not specify the size or shape of the mounting hole, as long as the heat pipe 12N can pass through the mounting hole.

[0160] In some embodiments, a sealant is provided between the heat pipe 12N and the first housing wall 1011.

[0161] In some embodiments, the heat-conducting element 12M is in contact with the first housing wall 1011, the evaporation end 12p of the heat pipe 12N is in contact with the surface of the second heat-conducting section 12b, and the condensation end 12q passes through the mounting hole and is located outside the housing 101.

[0162] In other embodiments, the entire heat-conducting element 12M is spaced apart from the first housing wall 1011, the evaporation end 12p of the heat pipe 12N is in contact with the surface of the second heat-conducting section 12b, and the condensation end 12q passes through the mounting hole and is located outside the housing 101.

[0163] In some embodiments, along the extension direction of the first pipe segment, all or part of the first pipe segment may be in contact with the surface of the second heat-conducting segment 12b. This application does not impose any special limitations on the length of the first pipe segment along its extension direction or its cross-sectional area perpendicular to the extension direction, as long as it can absorb heat from the heat-conducting element. Of course, to more effectively absorb heat from the heat-conducting element, the contact area between the first pipe segment and the second heat-conducting segment 12b can be increased.

[0164] This application does not impose any special limitations on the length of the second pipe segment along its extension direction or its cross-sectional area perpendicular to the extension direction, as long as it can dissipate heat. Of course, the volume of the second pipe segment can be increased for more effective heat dissipation.

[0165] In some embodiments, part or all of the second pipe segment is higher than the first pipe segment along the direction of gravity.

[0166] Because the first housing wall 1011 has a mounting through hole that extends through the first housing wall 1011 along its thickness, the evaporation end of the heat pipe 12N can be easily connected to the heat conductor 12M, while the condensation end 12q is located outside the housing 101. Since the first pipe section is located within the containment space and the evaporation end 12p is in surface contact with the second heat conductor 12b, and the second pipe section is located outside the housing 101, thus exposing the condensation end 12q to the external environment, the heat from the battery cell can be transferred to the outside of the housing for heat dissipation. Furthermore, because the condensation end 12q is higher than the evaporation end 12p along the direction of gravity, the evaporation end 12p absorbs the heat from the battery cell, the liquid inside the heat pipe 12N evaporates into gas, flows to the condensation end 12q for heat dissipation, the gas becomes liquid again, and flows back to the evaporation end 12p under gravity to absorb heat, thereby achieving a cycle.

[0167] In some embodiments, such as Figure 6 As shown, the heat pipe 12N is formed in the following shape: at least one of the first pipe section and the second pipe section is inclined relative to the wall surface of the first housing wall 1011; or, as shown Figure 9 or Figure 10 As shown, the heat pipe 12N is formed in the following shape: at least one of the first pipe section and the second pipe section is disposed along the wall surface of the first housing wall 1011.

[0168] In some embodiments, such as Figure 6 As shown, the heat pipe 12N is in the shape of an "I" and passes obliquely through the first housing wall 1011. This allows the evaporation end 12p to contact and connect with the second heat-conducting section 12b, while the condensation end 12q is located outside the housing. It also allows the condensation end 12q to be higher than the evaporation end 12p along the direction of gravity.

[0169] In other embodiments, such as Figure 9 As shown, the second pipe section can extend along the inner wall of the first housing wall 1011, and the heat of the battery cell can be transferred to the evaporation end 12p. Part of the heat can be transferred from the evaporation end 12p to the first housing wall 1011 and dissipated through the first housing wall 1011. Another part of the heat can be transferred from the evaporation end 12p to the condensation end 12q and dissipated through the condensation end 12q.

[0170] In some other embodiments, such as Figure 10 As shown, the first pipe section can extend along the inner wall of the first housing wall 1011, and the heat of the battery cell can be transferred to the evaporation end 12p. Part of the heat can be transferred from the evaporation end 12p to the first housing wall 1011 and dissipated through the first housing wall 1011. Another part of the heat can be transferred from the evaporation end 12p to the condensation end 12q and dissipated through the condensation end 12q.

[0171] This increases the design freedom of heat pipe shapes.

[0172] In some embodiments, in the same heat-conducting component 12, there are multiple heat pipes 12N, and the evaporation end 12p of each of the multiple heat pipes 12N is in contact with the same heat-conducting element 12M surface.

[0173] In some embodiments, the number of heat pipes 12N can be two or more, and of course, the number of heat pipes 12N can also be one.

[0174] In some embodiments, a plurality of heat pipes 12N may contact the same or different heat-conducting sections of the heat-conducting element 12M.

[0175] In a specific embodiment, such as Figure 8 As shown, multiple heat pipes 12N are spaced apart along the first direction X, and all of the multiple heat pipes 12N are in contact with the second heat-conducting section 12b.

[0176] Therefore, the energy storage system can dissipate heat through multiple heat pipes, thereby improving the heat dissipation efficiency of the energy storage device.

[0177] In some embodiments, the heat pipe includes a vapor chamber.

[0178] A vapor chamber can be understood as a flattened, two-dimensional heat pipe. It upgrades heat transfer from a "line" or "point" to a "surface" heat transfer. The evaporator end 12p and the condenser end 12q of the vapor chamber are on a two-dimensional plane. It can rapidly and evenly diffuse the high heat flux density concentrated on tiny components to the entire vapor chamber, which is beneficial for subsequent heat dissipation.

[0179] For example, the heat spreader can be a vacuum chamber heat spreader (VC heat spreader).

[0180] Not only do vapor chambers have high heat dissipation performance, which can improve the heat dissipation efficiency of energy storage systems, but their small size can also reduce the overall size of energy storage devices.

[0181] In some embodiments, such as Figure 8 and Figure 10 As shown, in the same battery cell 10, there are at least two first heat-conducting sections 12a. The battery cell assembly 11 has first heat-conducting sections 12a on both sides along the first direction X. The first direction X intersects the arrangement direction of the battery cells 110. The second heat-conducting section 12b extends along the first direction X and is connected to the first heat-conducting section 12a at both ends along the first direction X. The multiple heat-conducting sections also include a third heat-conducting section 12c that is arranged opposite to the second heat-conducting section 12b along the arrangement direction of the battery cells 110. The third heat-conducting section 12c extends along the first direction X and is connected to the first heat-conducting section 12a at both ends along the first direction X. The third heat-conducting section 12c and the side of the battery cell assembly 11 away from the second heat-conducting section 12b are in surface contact with each other.

[0182] In some embodiments, the shape and size of the first heat-conducting sections 12a on both sides of the battery cell assembly 11 along the first direction X may be the same or different. In a specific embodiment, the shape and size of the first heat-conducting sections 12a on both sides of the battery cell assembly 11 along the first direction X are the same.

[0183] In some embodiments, the third heat-conducting section 12c is the battery cell 110 in the battery cell assembly 11 that is furthest from the second heat-conducting section 12b (and also furthest from the first housing wall 1011) along the arrangement direction of the battery cells 110 (e.g., Figure 8 The leftmost battery cell 110 shown is in contact with the casing surface.

[0184] In some embodiments, such as Figures 6 to 8 As shown, the first heat-conducting section 12a, the second heat-conducting section 12b, the first heat-conducting section 12a and the third heat-conducting section 12c are connected in sequence to form a ring. The ring-shaped heat-conducting component 12M surrounds the battery cell assembly 11. The two first heat-conducting sections 12a and the third heat-conducting section 12c are in close contact with the battery cell assembly 11, but there may be a small gap between the second heat-conducting section 12b and the battery cell assembly 11.

[0185] Since both the first heat-conducting section 12a and the third heat-conducting section 12c are in contact with the surface of the battery cell assembly 11, the contact area between the heat-conducting component 12M and the battery cell assembly 11 is increased, which can more effectively transfer the heat of the battery cell assembly 11 to the heat-conducting component 12M, and then to the heat pipe 12N, thereby improving the heat dissipation efficiency of the energy storage device 100.

[0186] In some embodiments, such as Figure 6 and Figure 7 As shown, in the same battery cell 10, the battery cells 110 are arranged with their large surfaces facing each other, and the large surface is the largest shell surface in the outer casing 112. The battery cell 10 also includes at least two end plates 13 and at least one restraining member 14. Along the arrangement direction of the battery cells 110 in the same battery cell 10, the battery cell assembly 11 is provided with end plates 13 on both sides. The restraining member 14 and the heat-conducting member 12M are both arranged around the battery cell assembly 11 and the end plates 13. The surrounding direction of the restraining member 14 is the same as the surrounding direction of the heat-conducting member 12M, and the heat-conducting member 12M and the restraining member 14 are staggered.

[0187] In some embodiments, along the arrangement direction of the battery cells 110 in the same battery cell 10, at least two end plates 13 are respectively located on both sides of the battery cell assembly 11, and the end plates 13 located on both sides of the battery cell assembly 11 clamp the battery cell assembly 11. The direction in which the end plates 13 clamp the battery cell assembly 11 is usually also the direction in which the battery cells 110 expand due to charge and discharge cycles. Therefore, the end plates 13, in cooperation with the restraint members 14, can suppress the deformation tendency caused by the expansion force of the battery cells.

[0188] The end plate 13 can be generally flat, or it can be other shapes. The end plate 13 can be made of metal, resin, or a combination of metal and resin parts.

[0189] Optionally, the number of restraints 14 can be one, two, or more.

[0190] In some embodiments, the restraint 14 is secured around the battery cell assembly 11. Where the battery cell assembly 11 also has end plates 13 on both sides, the restraint 14 secures the battery cell assembly 11 to the end plates 13.

[0191] exist Figure 6 and Figure 8 In the embodiment shown, the restraint 14 is bound around the battery cell assembly 11 and the end plate 13 when viewed along the second direction Y.

[0192] In one specific embodiment, the restraint 14 may be a steel strip formed into a loop.

[0193] In some embodiments, such as Figure 6 As shown, the number of restraint members 14 is at least two, and these restraint members 14 can be arranged at intervals along the second direction Y, with the heat-conducting member 12M located between the restraint members 14. Figure 6 The case with two restraints 14 is shown.

[0194] The thermal conductive element 12M and the restraining element 14 are staggered, meaning that for the casing wall of the same battery cell (e.g., the third casing wall 1123 hereinafter), the thermal conductive element 12M and the restraining element 14 are in contact with different surfaces on the casing wall along the second direction Y. For example, one restraining element 14 and one thermal conductive element 12M may be arranged alternately along the second direction Y. Alternatively, for example, the thermal conductive element 12M may be located between the restraining elements 14 spaced apart along the second direction Y, and the end edge of the thermal conductive element 12M may abut against the restraining element 14 or be spaced apart from the restraining element 14. In some embodiments, such as Figure 6 As shown, along the second direction Y, the two ends of the heat-conducting component 12M are respectively arranged adjacent to the two binding components 14.

[0195] In a specific embodiment, such as Figures 6 to 8 As shown, the battery cell 110 includes an electrode terminal 111 and an electrode assembly 114 located inside the housing 112 and electrically connected to the electrode terminal 111. The housing 112 includes a first housing wall 1121 and a third housing wall 1123 connected together. The first housing wall 1121 is located on one side of the electrode assembly 114 along the second direction Y. The electrode terminal 111 is disposed on the first housing wall 1121. The heat-conducting element 12M surrounds the battery cell assembly 110 along the second direction Y and contacts the third housing wall 1123 of each battery cell 110, and also contacts an end plate 13. Two binding members 14 surround the battery cell assembly 11 and the end plate 13 respectively around the second direction Y, and the two binding members 14 are spaced apart along the second direction Y. Along the second direction Y, the heat-conducting element 12M is located between the two spaced binding members 14.

[0196] In some alternative embodiments, the thickness of the restraint 14 is greater than the thickness of the heat-conducting element 12M.

[0197] Since the battery cell assembly 11 has end plates 13 on both sides, and the restraint member 14 is arranged around the battery cell assembly 11 and the end plates 13, the end plates 13 and the restraint member 14 can fix the relative positions of multiple battery cells 110 and keep them in close contact with each other, which is beneficial for assembling them as a whole into the housing 101 of the energy storage device 100. Since the surrounding direction of the restraint member 14 is the same as the surrounding direction of the heat conductor 12M and the heat conductor 12M is staggered from the restraint member 14, it is convenient to set up the restraint member 14 and the heat conductor 12M, reducing the probability of interference between the restraint member 14 and the heat conductor 12M, and also reducing the risk that the heat conductor 12M will be broken due to the expansion force of the battery cell 110.

[0198] In some embodiments, the restraint member 14 is configured as a strip, and there are multiple restraint members 14 in the same battery cell 10. The multiple restraint members 14 are arranged at intervals, and the heat-conducting member 12M is arranged between adjacent restraint members 14.

[0199] By setting two or more restraints 14, the restraint force on the battery cell assembly 11 can be increased, and the significant change in the assembly size of the battery cell 10 due to the expansion of the battery cell 110 can be reduced. By arranging the heat-conducting element 12M between adjacent restraints 14, the risk of the heat-conducting element 12M being pulled off by the expansion force of the battery cell 110 can be reduced more effectively while achieving contact heat transfer.

[0200] In some embodiments, such as Figure 10As shown, the multiple heat-conducting sections also include a fourth heat-conducting section 12e and a fifth heat-conducting section 12f connected to each other. In the same battery cell 10, the fourth heat-conducting section 12e is in contact with the outer shell 112 surface of the multiple battery cells 110, and the plane where the outer shell 112 contact surface of the fourth heat-conducting section 12e is located intersects the plane where the outer shell 112 contact surface of the first heat-conducting section 12a is located and the plane where the outer shell 112 contact surface of the third heat-conducting section 12c is located, respectively; the fifth heat-conducting section 12f is in surface contact with the evaporation end 12p.

[0201] In some embodiments, the fourth thermally conductive section 12e and the fifth thermally conductive section 12f are bent relative to each other.

[0202] In some embodiments, such as Figure 10 As shown, the fourth thermally conductive section 12e can be connected to the bottom of the battery cell assembly 11 (e.g., Figure 10 (as shown below), top (e.g.) Figure 10 The upper side (as shown) or side surface is in contact, but the plane where the outer shell 112 of the fourth heat-conducting section 12e is located intersects the plane where the outer shell 112 of the first heat-conducting section 12a is located and the plane where the outer shell 112 of the third heat-conducting section 12c is located. That is, in some embodiments, the fourth heat-conducting section 12e and the fifth heat-conducting section 12f can be provided instead of the first heat-conducting section 12a, the second heat-conducting section 12b, and the third heat-conducting section 12c. In other embodiments, it can be as follows: Figure 10 As shown, a first heat-conducting section 12a, a second heat-conducting section 12b, a third heat-conducting section 12c, a fourth heat-conducting section 12e, and a fifth heat-conducting section 12f are all provided.

[0203] Optionally, the fourth heat-conducting section 12e can be in surface contact with the outer casing 112 of some of the battery cells 110 in the battery cell assembly 11, or the fourth heat-conducting section 12e can be in surface contact with the outer casing 112 of all the battery cells 110 in the battery cell assembly 11. Figure 10 In the embodiment shown, the fourth thermally conductive section 12e is in contact with the bottom wall surface of all battery cells 110 in the battery cell assembly 11.

[0204] This application does not specifically limit the contact area between the fourth heat-conducting section 12e and the outer casing 112. It can be limited according to the heat dissipation requirements of the battery cell 10, the thermal conductivity parameters of the heat-conducting component 12M, and the heat dissipation parameters of the first casing wall 1011. The contact area can be adjusted by adjusting the width of the fourth heat-conducting section 12e.

[0205] In one specific embodiment, the fourth thermally conductive segment 12e extends along the third direction Z, and the fifth thermally conductive segment 12f extends along the second direction Y.

[0206] The fourth heat-conducting section 12e conducts the heat from the battery cell to the fifth heat-conducting section 12f, which in turn conducts the heat to the heat pipe 12N. The heat pipe 12N then conducts the heat to the outside of the housing 101, thereby dissipating heat. This application does not specifically limit the contact area between the fifth heat-conducting section 12f and the evaporation end 12p, but can limit it according to the heat dissipation requirements of the battery cell 10, the thermal conductivity parameters of the heat-conducting component 12M, and the heat dissipation parameters of the heat pipe 12N.

[0207] In some embodiments, the fifth thermally conductive section 12f can contact the first housing wall 1011. The fourth thermally conductive section 12e conducts heat from the battery cell to the fifth thermally conductive section 12f, which in turn conducts heat to the first housing wall 1011 for heat dissipation. This application does not specifically limit the contact area between the fifth thermally conductive section 12f and the first housing wall 1011; it can be limited according to the heat dissipation requirements of the battery cell 10, the thermal conductivity parameters of the thermally conductive component 12M, and the heat dissipation parameters of the first housing wall 1011. Of course, the fifth thermally conductive section 12f can be spaced apart from the first housing wall 1011.

[0208] In some embodiments, the fifth heat-conducting section 12f extends close to the inner wall surface of the first housing wall 1011.

[0209] In an optional embodiment, such as Figure 10 As shown, the fifth heat-conducting section 12f is connected to the second heat-conducting section 12b.

[0210] In some embodiments, the first thermally conductive section 12a, the third thermally conductive section 12c, and the fourth thermally conductive section 12e are respectively connected to different surfaces of the battery cell assembly 11. This arrangement of contacting the housing surfaces of multiple battery cells facilitates more efficient heat conduction from the battery cells.

[0211] Since the fourth heat-conducting section 12e is in contact with the outer casing 112 of the multiple battery cells 110, the heat of the multiple battery cells 110 can be directly and effectively transferred to the fourth heat-conducting section 12e. The fourth heat-conducting section 12e transfers the heat to the fifth heat-conducting section 12f connected to it. Since the fifth heat-conducting section 12f is in contact with the evaporation end 12p, the heat can be effectively transferred to the heat pipe and then dissipated outside the casing. Thus, heat dissipation is achieved, and the heat dissipation efficiency of the energy storage device 100 is improved. Since the plane where the outer shell 112 of the fourth heat-conducting section 12e is located intersects the plane where the outer shell 112 of the first heat-conducting section 12a and the third heat-conducting section 12c are located, the fourth heat-conducting section 12e, the first heat-conducting section 12a, and the third heat-conducting section 12c respectively contact different surfaces of the outer shell 112, increasing the contact area between the heat-conducting component 12M and the outer shell 112, it can more effectively transfer the heat of the battery cell assembly 11 to the heat-conducting component 12M, thereby improving the heat dissipation efficiency of the energy storage device 100.

[0212] In some embodiments, such as Figure 7 and Figure 11 As shown, the battery cell 110 also includes an electrode terminal 111 and a pressure relief mechanism 115. The electrode terminal 111 and the pressure relief mechanism 115 are disposed in the housing 112. The heat-conducting element 12M and the portion of the housing 112 that avoids the electrode terminal 111 and the pressure relief mechanism 115 are in surface contact with each other.

[0213] In some optional embodiments, the electrode terminal 111 and the pressure relief mechanism 115 are disposed on the first housing wall 1121 of the housing 112, and the heat-conducting element 12M is in contact with a portion of the first housing wall 1121 that avoids the electrode terminal 111 and the pressure relief mechanism 115. For example, the electrode terminal 111 is located near the center of the first housing wall 1121, and the heat-conducting element 12M can be in contact with the surfaces near both ends of the first housing wall 1121 without covering the pressure relief mechanism 115. In other embodiments, such as... Figures 6 to 8 As shown, the heat-conducting element 12M is in contact with the surface of the housing wall other than the first housing wall 1121. In another embodiment, as... Figure 11 As shown, the heat-conducting component 12M is in contact with the housing wall surface outside the housing wall where the electrode terminal 111 is located, and does not cover the pressure relief mechanism 115.

[0214] exist Figure 10 In the specific embodiment shown, the battery cell 110 includes a pressure relief mechanism 115 and electrode terminals 111; the housing 112 includes multiple housing walls, including a first housing wall 1121 intersecting the second direction Y (e.g., Figure 10 The pressure relief mechanism 115 and electrode terminals are located on the first housing wall 1121. The first heat-conducting section 12a is connected to the housing wall (third housing wall 1123) that is opposite to the first housing wall along the first direction X among the plurality of housing walls. The third heat-conducting section 12c is in contact with the housing wall that intersects the third direction Z and is along the third direction Z and away from the first housing wall 1011 among the plurality of housing walls. The fourth heat-conducting section 12e is connected to the housing wall (e.g., the first housing wall 1121) that is opposite to the first housing wall 1121 along the second direction Y. Figure 10 (The bottom wall shown is in contact with the ground).

[0215] Since the heat-conducting element 12M and the portion of the housing 112 that avoids the electrode terminal 111 and the pressure relief mechanism 115 are in surface contact with each other, the heat-conducting element 12M can avoid the electrode terminal 111 and the pressure relief mechanism 115, so that the electrode terminal 111 and the pressure relief mechanism 115 can work normally.

[0216] In some embodiments, the thermally conductive element 12M is a sheet-like component bonded to the housing by thermally conductive adhesive. Exemplarily, the thermally conductive element 12M can be a thermally conductive film.

[0217] In some embodiments, the surface with the largest surface area of ​​the sheet is in contact with the surface of the housing 112.

[0218] Since the heat-conducting component 12M is a sheet-like component, its overall size is small, which reduces the negative impact of the heat-conducting component 12M on the volumetric energy density and mass energy density of the energy storage device 100.

[0219] In some embodiments, the in-plane thermal conductivity of the thermally conductive element 12M is in the range of 1000 W / (m·K) to 5300 W / (m·K).

[0220] In-plane thermal conductivity refers to the ability of a material to conduct heat in its own plane direction. It can quantify the efficiency and rate of heat conduction within the plane of a material.

[0221] In-plane thermal conductivity measures the amount of heat passing through a unit area per unit time under steady-state thermal conductivity conditions in a specific planar direction, under a unit temperature gradient.

[0222] Optionally, the in-plane thermal conductivity of the heat-conducting component 12M can be 1000 W / (m·K), 1500 W / (m·K), 2000 W / (m·K), 2500 W / (m·K), 3000 W / (m·K), 3500 W / (m·K), 4000 W / (m·K), 4500 W / (m·K), 5000 W / (m·K), 5200 W / (m·K), 5300 W / (m·K), etc. Of course, the in-plane thermal conductivity of the heat-conducting component 12M can also be any other value among any two of the above values.

[0223] For example, the 12M thermal conductive component can use graphene heat dissipation film, graphite heat dissipation film, etc.

[0224] Because the heat conductor 12M has good in-plane thermal conductivity, it can effectively transfer the heat of the battery cell 110 to the evaporation end along the extension direction of the heat conductor 12M, and then effectively transfer the heat to the condensation end, so as to quickly and efficiently dissipate heat from the battery cell 110 in the energy storage device 100.

[0225] In some embodiments, the in-plane thermal conductivity of the thermally conductive element 12M is in the range of 1000 W / (m·K) to 1500 W / (m·K).

[0226] Optionally, the in-plane thermal conductivity of the heat-conducting component 12M can be 1100 W / (m·K), 1200 W / (m·K), 1300 W / (m·K), 1400 W / (m·K), etc. Of course, the in-plane thermal conductivity of the heat-conducting component 12M can also be any other value among any two of the above values.

[0227] This allows for a balance between the thermal conductivity of the 12M thermal conductive component and the need to reduce costs.

[0228] In some embodiments, the thermal conductive element 12M material includes any one of graphene, carbon nanotubes, diamond, and boron nitride.

[0229] Because graphene, carbon nanotubes, diamond, or boron nitride have good thermal conductivity, the heat of the battery cell 110 can be effectively conducted to the evaporation end 12p, and then the heat can be effectively transferred to the condensation end 12q, thereby effectively achieving heat dissipation of the energy storage device 100.

[0230] In some embodiments, the material of the first housing wall 1011 includes metal; the heat-conducting component 12M is bonded to the first housing wall 1011 by thermally conductive adhesive.

[0231] Optionally, the first housing wall 1011 may be made of at least one of stainless steel plate, aluminum-magnesium steel plate, steel plate, etc.

[0232] Since the heat-conducting component 12M is bonded to the first housing wall 1011 with thermally conductive adhesive, the heat from the battery cell 110 can not only be transferred to the heat pipe 12N through the heat-conducting component 12M for heat dissipation, but also transferred to the first housing wall 1011 through the heat-conducting component 12M for heat dissipation. Furthermore, since the metal material has good thermal conductivity and heat dissipation performance, and the heat-conducting component 12M is tightly attached to the first housing wall 1011 with thermally conductive adhesive, heat can be efficiently transferred to the first housing wall 1011 through the heat-conducting component 12M and diffused along the wall surface of the first housing wall 1011, increasing the contact area between heat and air, and dissipating heat more effectively outside the energy storage device 100.

[0233] In some embodiments, such as Figure 4 As shown, the multiple housing walls include a top wall 1013 and a bottom wall 1014 arranged opposite each other along the height direction of the energy storage device 100, and multiple side walls located between the top wall 1013 and the bottom wall 1014. The multiple side walls include a first housing wall 1011. The number of battery cells 10 is multiple. The first housing wall is perpendicular to the arrangement direction of the battery cells 110 in the same battery cell 10.

[0234] In some embodiments, the arrangement direction of the first housing wall 1011 and the battery cells 10 is the same as the arrangement direction of the individual battery cells 110 in the same battery cell 10. The heat-conducting components 12 in each battery cell 10 can be connected to the first housing wall, and the heat-conducting components 12 in each battery cell 10 do not interfere with each other.

[0235] by Figure 4 The orientation shown is illustrated as an example. The first box wall can be the left or right wall of box 101.

[0236] Therefore, when the energy storage device 100 has multiple battery cells 10, the heat-conducting components 12 of the multiple battery cells 10 can all contact the first housing wall 1011 without interfering with each other, thereby achieving heat dissipation of the multiple battery cells 10. Moreover, by using the side wall of the housing wall to install the heat-conducting components, it is convenient to arrange the battery cells 10 in the housing 101.

[0237] In some embodiments, such as Figure 4 As shown, the multiple side walls also include a second housing wall 1012. Along the arrangement direction of the battery cells 110 in the same battery unit 10, the first housing wall 1011 and the second housing wall 1012 are arranged opposite to each other. The second housing wall 1012 has a door opening and is connected to a door 1015.

[0238] This application does not specify the exact location, shape, or size of the doorway, as long as it allows components such as the battery unit 10 to be installed into or removed from the housing 101 through the doorway, and allows for the inspection or installation of components inside the housing 101 through the doorway.

[0239] The energy storage device 100 may also include a door 1015, which is connected to the box wall around the doorway and can be opened and closed relative to the doorway.

[0240] In some embodiments, the battery cells 110 in the same battery cell 10 are arranged in the same direction, and the first housing wall 1011 is arranged in sequence with the battery cell 10 and the second housing wall 1012.

[0241] The heat-conducting component 12 in the battery cell 10 is installed on the side wall where no doorway is provided.

[0242] Since the second housing wall has a door opening and is connected to a door 1015, the components inside the housing 101 can be assembled, disassembled or repaired through the door opening. Moreover, the heat pipe 12N is installed on the first housing wall 1011, which does not have a door opening, thus reducing the impact of opening and closing the door 1015 on the heat conduction component 12.

[0243] In some embodiments, such as Figure 3 and Figure 4 As shown, there are multiple battery cells 10, and the multiple battery cells 10 are arranged along the first direction X to form a battery cell array 10A. The energy storage device 100 includes one or more battery clusters 102, each battery cluster 102 includes multiple battery cell arrays 10A, and each battery cell array 10A is stacked along the second direction Y. The first direction X, the second direction Y and the arrangement direction of the battery cells in the same battery cell intersect each other, and the second direction Y is consistent with the height direction of the energy storage device 100.

[0244] In some embodiments, multiple battery cells 10 in the same battery cell array 10A may be spaced apart or arranged adjacent to each other along the first direction X. In some embodiments, the battery cell 10 may be regarded as a battery module, the battery cell array 10A may be regarded as a battery device (battery pack) including multiple battery modules, and multiple battery cell arrays 10A stacked in the same column along the second direction Y may be regarded as a battery cluster.

[0245] In some embodiments, the energy storage device 100 further includes a plurality of support members arranged along the second direction Y, the support members being located inside the housing 101, and a plurality of battery cells 10 arranged along the first direction X to form a battery cell array 10A, the support members supporting the battery cell array 10A.

[0246] Optionally, the support member can be configured as a support frame with multiple layers of support grids to support each battery cell array 10A in layers; or, the support member can be configured as multiple layers of partitions connected to the housing of the energy storage device 100 to support each battery cell array 10A in layers. As long as it can support each battery cell, the specific form of this application embodiment is not particularly limited.

[0247] In some embodiments, such as Figure 3 As shown, when viewed along the arrangement direction of the battery cells 110 in the same battery cell 10, the battery cells 10 are arranged in an array, and the heat-conducting components 12 in each battery cell 10 can be connected to the surface of the first housing wall 1011, and the heat-conducting components 12 in each battery cell 10 do not interfere with each other.

[0248] Therefore, the energy storage device 100 may include multiple battery clusters 102, and the battery cells 10 in the battery clusters 102 may be arranged in multiple layers, and multiple battery cells 10 may be arranged in each layer, which is beneficial to improving the energy density of the energy storage device 100, and also enables the heat pipe 12N of each battery cell 10 to be installed on the first housing wall 1011.

[0249] A second aspect of this application provides an energy storage system 1000, such as... Figure 1 As shown, the energy storage system 1000 includes the energy storage device 100 and the power conversion device 200 described in the first aspect above. The power conversion device 200 is used to electrically connect the power generation device 3000 and the energy storage device 100.

[0250] This helps reduce the energy consumption cost and operation and maintenance cost of the energy storage system 1000.

[0251] A third aspect of this application provides a charging network 2000, such as... Figure 1 and Figure 2As shown, the charging network 2000 includes a charging pile 2100 and the energy storage device 100 of the first aspect or the energy storage system 1000 of the second aspect, wherein the energy storage device 100 is used to provide electrical energy to the charging pile 2100.

[0252] This helps reduce the energy consumption and operation and maintenance costs of the charging network 2000, and in turn helps reduce the cost of charging using the charging pile 2100.

[0253] The following is a specific example from an embodiment of this application.

[0254] In a specific embodiment, such as Figure 3 and Figure 4 As shown, four battery clusters 102 are installed inside the container. Each battery cluster 102 contains eight battery unit arrays 10A. Each battery unit array 10A is fixed on the support frame 105 and contains four battery units 10. Each battery unit 10 is surrounded by a heat-conducting component 12M. The heat-conducting component 12M can be a graphene film. The graphene film extends to the heat pipe 12N and makes surface contact with the heat pipe 12N. The heat pipe 12N is embedded in the container wall. The evaporation end 12p of the heat pipe 12N is surface connected to the heat-conducting component 12M, and the condensation end 12q extends outside the container 101. Heat is transferred to the external environment in the container 101. A high thermal conductivity thermal adhesive is filled between the heat pipe 12N and the graphene film to reduce thermal resistance. When the battery cell 10 is in operation, the heat accumulated in the battery cell 110 causes the temperature of the battery cell 110 to rise. The heat of the battery cell 110 is transferred to the graphene film, improving the temperature uniformity of the battery cell assembly and diffusing the heat to the heat pipe 12N. The part of the heat pipe 12N in contact with the graphene film is the evaporation end 12p. The evaporation end 12p absorbs the heat from the battery cell and forms a gas, which diffuses along the heat pipe 12N to the condensation end 12q outside the housing. After releasing the heat, the gas condenses into a liquid and, under the action of gravity, condenses back to the evaporation end 12p in contact with the graphene film. This is the heat transfer process.

[0255] In the embodiments of this application, there are no requirements for the internal structure of the housing 101. In some embodiments, a case is described where four battery clusters 102 are present, each containing an array of eight battery cells 10A, such as... Figure 3As shown, the energy storage device also includes a fire control cabinet, a distribution box, a battery control system (BMS) control cabinet, and an external junction box. The structure of the energy storage device 100 is not specifically limited. The location and function of the distribution box, BMS control cabinet, and other equipment can be implemented in other ways (e.g., centralized BMS, centralized power distribution, etc.). There are no requirements for the fixing method of the battery unit array 10A. The battery unit array 10A described in this application is fixed on the support frame 105. In other solutions, the battery unit array 10A may be fixed on the support panel, the support panel may be fixed on the bracket, or other methods may be used to fix the battery unit array 10A.

[0256] In the embodiments of this application, the material of the thermal conductive element 12M is not specifically limited. In some embodiments, the thermal conductive element 12M is a graphene film with high thermal conductivity. In other embodiments, other materials with high thermal conductivity may also be used.

[0257] In the embodiments of this application, there are no requirements regarding the structure of the heat pipe 12N. In some embodiments, there are multiple heat pipes 12N, which together dissipate heat for the battery cell assembly. The multiple heat pipes 12N are spaced apart along the first direction X and connected to the second heat-conducting section 12b. In other embodiments, the heat pipe 12N can be a VC heat sink. In some embodiments, the heat pipe 12N is a straight pipe; in other embodiments, the heat pipe 12N can be a bent pipe, with the condenser end 12q extending outside the housing bent.

[0258] In the embodiments of this application, there are no special requirements for the fixing method of the graphene film and the heat pipe 12N. In some embodiments, the graphene film and the heat pipe 12N are bonded together, with the graphene film and the heat pipe 12N surface-to-surface, and a high-performance thermally conductive adhesive is used between the graphene film and the heat pipe 12N to reduce thermal resistance. In other embodiments, the graphene film and the heat pipe 12N can be pressed together or connected by adjustable clips or other means. For example, a quick-pressing structure can be provided to press the graphene film and the heat pipe 12N together to form surface contact, eliminating the need for high-performance thermally conductive adhesive and enabling quick assembly and disassembly of the battery unit 10, saving maintenance time. There are no requirements for the fixing method of the heat pipe 12N. In this solution, the heat pipe 12N is embedded in the first housing wall, and the gap is sealed with adhesive. In other embodiments, there may be other ways to fix the heat pipe 12N.

[0259] In the embodiments of this application, there are no special requirements for the installation position of graphene. In some embodiments, graphene is attached to both sides of the battery cell assembly 11 and extends along the arrangement direction of the battery cells 110 in the same battery cell 10. In other embodiments, graphene may be attached to the bottom of the battery cell assembly 11, or at the bottom of the battery cell assembly 11 (e.g., at the bottom of the bottom of the battery cell assembly 11). Figure 10 (as shown at the bottom) and both sides (e.g.) Figure 10The graphene film (shown on both the left and right sides) is attached to both sides. Increasing the contact area between the graphene film and the battery cell assembly or the cross-sectional area of ​​graphene conduction helps to improve heat dissipation and temperature uniformity of the battery cell 110.

[0260] In the embodiments of this application, there are no special requirements for the type of battery. In some embodiments, such as Figures 5 to 10 As shown, the battery cell 110 is a prismatic battery cell. In other embodiments, such as... Figure 11 As shown, the battery cell 110 is a short blade battery cell or a blade battery cell.

[0261] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of this application.

Claims

1. An energy storage device, characterized in that, include: The box has multiple box walls that enclose a receiving space, and the multiple box walls include a first box wall; At least one battery cell is located in the receiving space. The battery cell includes a battery cell assembly and a thermally conductive assembly. The battery cell assembly includes a plurality of battery cells arranged in an array, and each battery cell includes a housing. The thermally conductive assembly includes a thermally conductive element and a heat pipe connected to the thermally conductive element. The heat pipe has an evaporation end and a condensation end. The heat-conducting component is in contact with the outer shell, the heat pipe is installed on the first housing wall, and the evaporation end is in contact with the heat-conducting component while the condensation end is located outside the housing.

2. The energy storage device according to claim 1, characterized in that, The heat-conducting component includes multiple heat-conducting segments, and the multiple heat-conducting segments include a first heat-conducting segment and a second heat-conducting segment connected to each other. In the same battery cell, the first thermally conductive section extends along the arrangement direction of the battery cells in the battery cell assembly and is in surface contact with the outer casing of the plurality of battery cells, and the second thermally conductive section extends along a direction intersecting the arrangement direction and is in surface contact with the evaporation end.

3. The energy storage device according to claim 2, characterized in that, The first housing wall has a mounting through hole that extends through the first housing wall along its thickness direction. The heat pipe includes a first section, a second section, and an intermediate section, which are sequentially connected and internally interconnected. The evaporation end is located in the first section, and the condensation end is located in the second section. The heat pipe is embedded in the mounting through hole. The first pipe section is located in the receiving space, and the evaporation end is in contact with the surface of the second heat-conducting section. The second pipe section is located outside the housing, so that the condensation end is exposed to the external environment. Along the direction of gravity, the condensing end is higher than the evaporating end.

4. The energy storage device according to claim 3, characterized in that, The heat pipe is formed in the following shape: at least one of the first pipe section and the second pipe section is inclined relative to the wall surface of the first housing; or, The heat pipe is formed in the following shape: at least one of the first pipe segment and the second pipe segment is disposed along the wall surface of the first housing wall.

5. The energy storage device according to any one of claims 1 to 4, characterized in that, In the same heat-conducting assembly, there are multiple heat pipes, and the evaporation end of each of the multiple heat pipes is in contact with the same heat-conducting surface.

6. The energy storage device according to any one of claims 1 to 4, characterized in that, The heat pipe includes a heat spreader.

7. The energy storage device according to any one of claims 2 to 4, characterized in that, In the same battery cell, the number of the first heat-conducting sections is at least two. The first heat-conducting sections are provided on both sides of the battery cell assembly along the first direction. The first direction intersects the arrangement direction of the battery cell. The second heat-conducting section extends along the first direction and is connected to the first heat-conducting section at both ends along the first direction. The plurality of heat-conducting sections further include a third heat-conducting section disposed opposite to the second heat-conducting section along the arrangement direction of the battery cell. The third heat-conducting section extends along the first direction and is connected to the first heat-conducting section at both ends along the first direction. The third heat-conducting section and the side of the battery cell assembly opposite to the second heat-conducting section are in surface contact with each other.

8. The energy storage device according to claim 7, characterized in that, In the same battery cell, the battery cells are arranged with their large surfaces facing each other, and the large surface is the shell surface with the largest area in the outer casing; The battery cell further includes at least two end plates and at least one restraining member. Along the arrangement direction of the battery cells in the same battery cell, the battery cell assembly has end plates on both sides. The restraining member and the heat-conducting member are arranged around the battery cell assembly and the end plates. The surrounding direction of the restraining member is the same as the surrounding direction of the heat-conducting member, and the heat-conducting member and the restraining member are staggered.

9. The energy storage device according to claim 8, characterized in that, The restraint element is configured as a strip. The number of restraints in the same battery cell is multiple, and the multiple restraints are arranged at intervals, with the heat-conducting element arranged between adjacent restraints.

10. The energy storage device according to claim 7, characterized in that, The plurality of heat-conducting sections also includes a fourth heat-conducting section and a fifth heat-conducting section connected to each other. In the same battery cell, the fourth heat-conducting section is in contact with the outer casing surfaces of multiple battery cells, and the plane where the outer casing contact surface of the fourth heat-conducting section is located intersects the plane where the outer casing contact surface of the first heat-conducting section is located and the plane where the outer casing contact surface of the third heat-conducting section is located; the fifth heat-conducting section is in surface contact with the evaporation end.

11. The energy storage device according to any one of claims 1 to 4, characterized in that, The battery cell also includes electrode terminals and a pressure relief mechanism, which are located within the housing. The heat-conducting element and the portion of the housing that avoids the electrode terminals and the pressure relief mechanism are in surface contact with each other.

12. The energy storage device according to any one of claims 1 to 4, characterized in that, The heat-conducting component is a sheet-like component that is bonded to the outer shell with thermally conductive adhesive.

13. The energy storage device according to any one of claims 1 to 4, characterized in that, The in-plane thermal conductivity of the heat-conducting component is in the range of 1000 W / (m·K) to 5300 W / (m·K).

14. The energy storage device according to claim 12, characterized in that, The thermal conductive component is made of any one of graphene, carbon nanotubes, diamond, or boron nitride.

15. The energy storage device according to any one of claims 1 to 4, characterized in that, The material of the first housing wall includes metal; The heat-conducting component is bonded to the wall of the first housing using thermally conductive adhesive.

16. The energy storage device according to any one of claims 1 to 4, characterized in that, The plurality of enclosure walls include a top wall and a bottom wall arranged opposite each other along the height direction of the energy storage device, and a plurality of side walls located between the top wall and the bottom wall, the plurality of side walls including the first enclosure wall. The number of battery cells is multiple, and the first housing wall is perpendicular to the arrangement direction of the battery cells in the same battery cell.

17. The energy storage device according to claim 16, characterized in that, The plurality of side walls also include a second housing wall. Along the arrangement direction of the battery cells in the same battery unit, the first housing wall and the second housing wall are arranged opposite to each other. The second housing wall has a door opening and is connected to a door.

18. The energy storage device according to claim 16, characterized in that, The battery cells are multiple, and the multiple battery cells are arranged along a first direction to form a battery cell array. The energy storage device includes one or more battery clusters, each battery cluster includes multiple battery cell arrays, each battery cell array is stacked along a second direction, the first direction, the second direction and the arrangement direction of the battery cells in the same battery cell intersect each other, and the second direction is consistent with the height direction of the energy storage device.

19. An energy storage system comprising an energy storage device and a power conversion device as described in any one of claims 1 to 18, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

20. A charging network comprising a charging pile and an energy storage device according to any one of claims 1 to 15 or an energy storage system according to claim 19, the energy storage device being used to provide electrical energy to the charging pile.

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