Energy storage device, energy storage system, and charging network

Abstract

The present application relates to the technical field of batteries, and discloses an energy storage device, an energy storage system, and a charging network. The energy storage device comprises battery cell assemblies, an energy storage housing, and a frame. Each battery cell assembly comprises at least one battery cell. The energy storage housing has an accommodating cavity; the frame is accommodated in the accommodating cavity; the frame is provided with a plurality of first partitions arranged at intervals in a height direction; an accommodating space is formed between every two adjacent first partitions; each accommodating space accommodates a battery cell assembly; and the first partition located at the bottom of each accommodating space is used for supporting the corresponding battery cell assembly. At least one of two adjacent first partitions is a thermal management component, and the thermal management component is used for regulating the temperature of battery cells. The technical solution provided by the present application can improve the volumetric energy density of the energy storage device.

Description

Energy storage devices, energy storage systems and charging networks Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202422475759.7, filed on October 14, 2024, entitled “Energy Storage Device, Energy Storage System and Charging Network”, the entire contents of which are incorporated herein by reference. Technical Field

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

[0003] In the development of energy storage devices, besides improving their reliability, increasing their volumetric energy density is also a crucial issue. Therefore, improving the volumetric energy density of energy storage devices remains a continuous technical challenge in energy storage technology. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0005] In the battery manufacturing process, battery assembly efficiency is a crucial issue. Therefore, improving battery assembly efficiency is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0006] This application provides an energy storage device, an energy storage system, and a charging network, which can improve the volumetric energy density of the energy storage device.

[0007] In a first aspect, embodiments of this application provide an energy storage device, including a battery cell assembly, a frame, and an energy storage housing; the battery cell assembly includes at least one battery cell; the frame has a plurality of first partitions spaced apart along the height direction, with a receiving space formed between two adjacent first partitions, the receiving space accommodating the battery cell assembly, and the first partition located at the bottom of the receiving space serving to support the battery cell assembly; the energy storage housing has a receiving cavity, and the frame is accommodated in the receiving cavity; wherein, in two adjacent first partitions, at least one first partition is a thermal management component, the thermal management component serving to regulate the temperature of the battery cell.

[0008] In the above technical solution, at least one of the two adjacent first separators is a thermal management component. The thermal management component is used to regulate the temperature of the battery cells. On the one hand, this allows at least one first separator in the two separators adjacent to the battery cell assembly to regulate the temperature of the battery cells in the battery cell assembly, thereby reducing the risk of the battery cell assembly temperature becoming too high due to heat generation during battery cell discharge and charging, thus improving the reliability of the energy storage device. On the other hand, by setting the first separator as a thermal management component, there is no need to set an additional thermal management component in the housing space, reducing the space occupied by the thermal management component and allowing the housing space to have more space to accommodate the battery cell assembly, thereby increasing the volumetric energy density of the energy storage device. At the same time, since the first separators are spaced apart, the housing space and the housing cavity are connected, which facilitates gas exchange between the housing space and the housing cavity, and facilitates heat exchange between the housing space and the housing cavity, thereby further reducing the risk of the battery cell assembly temperature becoming too high due to heat generation during battery cell discharge and charging, thus improving the reliability of the energy storage device.

[0009] In some embodiments, each of the first separators is the thermal management component.

[0010] In the above technical solution, each first separator is a thermal management component, which enables the first separator at the top of the battery cell assembly and the first separator at the bottom of the battery cell assembly to regulate the temperature of the battery cells in the battery cell assembly, thereby improving the temperature regulation efficiency and further reducing the risk of the battery cell assembly temperature being too high due to heat generation during the discharge and charging process of the battery cells, so as to improve the reliability of the energy storage device.

[0011] In some embodiments, the energy storage device further includes a connecting pipe and a thermal management module; one end of the connecting pipe is connected to the first separator and communicates with the flow channel inside the first separator; the other end of the connecting pipe is connected to the thermal management module so that the flow channel of the first separator is in fluid communication with the thermal management module, and the thermal management module is used to manage the temperature of the battery cell.

[0012] In the above technical solution, the flow channel of the first separator is fluidly connected to the thermal management module through the connecting pipe. By setting up the thermal management module, the thermal management module can manage the temperature of the battery cell and reduce the risk of temperature runaway of the battery cell.

[0013] In some embodiments, the battery cell assembly includes a plurality of battery cells, at least one of the battery cells contacting the first separator located at the top of the receiving space, and at least one of the battery cells abutting against the first separator located at the bottom of the receiving space.

[0014] In the above technical solution, at least one of the multiple battery cells contacts the first partition located at the top of the housing space, thereby improving the temperature regulation capability of the first partition located at the top of the housing space for the battery cell it contacts, and further reducing the risk of the battery cell assembly temperature being too high due to heat generation during the discharge and charging process of the battery cells; at least one of the multiple battery cells contacts the first partition located at the bottom of the housing space, thereby improving the temperature regulation capability of the first partition located at the top of the housing space for the battery cell it contacts, and further reducing the risk of the battery cell assembly temperature being too high due to heat generation during the discharge and charging process of the battery cells, thus improving the reliability of the energy storage device.

[0015] In some embodiments, a plurality of battery cells are stacked along the height direction, and each battery cell has a first wall and a second wall disposed opposite to each other in the height direction; the topmost of the plurality of battery cells is a first end battery cell, and the first wall of the first end battery cell contacts the first partition located at the top of the receiving space; the bottommost of the plurality of battery cells is a second end battery cell, and the second wall of the second end battery cell abuts against the first partition located at the bottom of the receiving space.

[0016] In the above technical solution, multiple battery cells are stacked along the height direction, with the first end battery cell contacting the first partition located at the top of the receiving space, and the second end battery cell abutting against the first partition located at the bottom of the receiving space. This allows two adjacent first partitions to abut against the battery cells at both ends of the battery cell assembly along the height direction. On one hand, the first partitions limit the expansion of the battery cells in the height direction, reducing the risk of the battery cell casing cracking due to excessive expansion and deformation, thus improving the reliability of the battery cells. On the other hand, the two adjacent first partitions directly contact the battery cells... The body components abut against each other to limit the height, thus eliminating the need for structural components (such as housings) that restrict the movement of individual battery cells within the housing space. This reduces the space occupied by limiting structural components, allowing more space to be used to accommodate individual battery cells, thereby increasing the volumetric energy density of the energy storage device. Furthermore, it allows both adjacent first separators to abut against the individual battery cells, improving the temperature regulation efficiency of the first separators on the individual battery cells within the battery cells. This further reduces the risk of overheating of the individual battery cells due to heat generation during discharge and charging, thereby improving the reliability of the energy storage device.

[0017] In some embodiments, the first wall and the second wall are the wall portions with the largest area of ​​the battery cell.

[0018] In the above technical solution, the first wall and the second wall are the wall portions with the largest area of ​​the battery cell. On the one hand, the first wall and the second wall have the largest area, thereby maximizing the expansion deformation of the battery cell in the height direction. By abutting the first wall of the first end battery cell against the first partition located at the top of the receiving space, and abutting the second wall of the second end battery cell against the first partition located at the bottom of the receiving space, the deformation of the battery cell in the direction of maximum deformation is better limited, further reducing the risk of the battery cell casing cracking due to excessive expansion and deformation, leading to the failure of the battery cell casing seal. This design improves the reliability of individual battery cells. Furthermore, the first and second walls have the largest areas, increasing the contact area between the first and second end battery cells and the first separator compared to cases where other walls are used to contact the first separator. This increases the area for heat exchange between the first separator and the battery cell assembly, further improving the temperature regulation efficiency of the first separator on the individual battery cells within the assembly. This further reduces the risk of overheating of the battery cell assembly due to heat generation during discharge and charging, thus enhancing the reliability of the energy storage device.

[0019] In some embodiments, the battery cell includes a housing and a first electrode assembly, the first electrode assembly being housed within the housing, the first electrode assembly including two first tabs of opposite polarity, the housing having a third wall and a fourth wall disposed opposite to each other in the width direction of the frame, one end of each of the two first tabs being disposed outside the third wall and the fourth wall respectively, the width direction of the frame being perpendicular to the height direction; the first tabs of two adjacent battery cells in the battery cell assembly are connected to electrically connect the first electrode assemblies of the two adjacent battery cells.

[0020] In the above technical solution, by connecting the first tabs of two adjacent battery cells in the height direction, the first electrode assembly of the two adjacent battery cells in the height direction is electrically connected. This eliminates the need for additional structural components to electrically connect the first electrode assembly of the two adjacent battery cells. Compared with the case of using a busbar to connect the first tabs of two adjacent battery cells, this reduces the production cost of the energy storage device and facilitates the assembly of the energy storage device, thereby improving the production efficiency of the energy storage device.

[0021] In some embodiments, the battery cell further includes a second electrode assembly housed within the housing, and the first electrode assembly and the second electrode assembly are spaced apart along the length of the frame; the second electrode assembly includes two second tabs of opposite polarity, one end of each second tab being disposed outside the third wall and the fourth wall respectively; the second tabs of two adjacent battery cells in the battery cell assembly are connected to electrically connect the second electrode assemblies of the two adjacent battery cells.

[0022] In the above technical solution, the first electrode assembly and the second electrode assembly are spaced apart along the length of the frame, thereby making reasonable use of the space in the length of the frame. By connecting the second tabs of two adjacent battery cells in the height direction, the second electrode assemblies of the two adjacent battery cells in the height direction are electrically connected. This eliminates the need for additional structural components to electrically connect the second electrode assemblies of the two adjacent battery cells. Compared with the case of using a busbar to connect the second tabs of the two adjacent battery cells, this reduces the production cost of the energy storage device and facilitates the assembly of the energy storage device, thereby improving the production efficiency of the energy storage device.

[0023] In some embodiments, along the width direction of the frame, the frame has a first side and a second side disposed opposite to each other, with a portion of one of the two first tabs extending beyond the first side and a portion of the other extending beyond the second side.

[0024] In the above technical solution, one of the two first tabs extends beyond the first side and the other extends beyond the second side. Thus, with a fixed length of the first tab, the space occupied by the first tab is reduced, allowing the storage space to have more space to accommodate the first electrode assembly of the battery cell, thereby increasing the volumetric energy density of the energy storage device.

[0025] In some embodiments, the first tabs of two adjacent battery cells in the battery cell assembly are welded together.

[0026] In the above technical solution, the first tabs of two adjacent battery cells are connected by welding, which can effectively improve the connection strength and reliability between the first tabs of the two battery cells, and help reduce the risk of the first tabs of the two battery cells falling off each other during use, thereby improving the reliability of the energy storage device.

[0027] In some embodiments, the accommodating space comprises a plurality of spaces arranged along the height direction; the frame comprises a plurality of spaces spaced apart along its width direction.

[0028] In the above technical solutions, the accommodating spaces are arranged in multiple units along the height direction. Therefore, when the dimensions of the accommodating spaces along the height direction of the frame are fixed, compared to the case where each frame has only one accommodating space, the space in the frame along the height direction is utilized more rationally. This allows the frame to accommodate more battery cell modules, and thus more battery cells, thereby increasing the energy density of the energy storage device. Similarly, when the dimensions of the energy storage box along the width direction of the frame are fixed, compared to the case where each energy storage box accommodates only one frame, the space in the width direction of the frame is utilized more rationally. This allows the energy storage box to accommodate more battery cell modules, and thus more battery cells, thereby increasing the energy density of the energy storage device.

[0029] In some embodiments, the energy storage device further includes a busbar for electrically connecting two adjacent battery cell assemblies.

[0030] In the above technical solution, two adjacent battery cell modules are connected by a busbar, which facilitates the output of current from multiple battery cell modules.

[0031] In some embodiments, the energy storage device further includes a strapping element that is fitted around the periphery of the battery cell assembly.

[0032] In the above technical solution, the strapping component is fitted around the outer periphery of the battery cell assembly, thereby restricting the expansion of the battery cells within the battery cell assembly. On the one hand, this reduces the risk of the battery cell casing cracking due to excessive expansion and deformation, leading to the failure of the battery cell casing seal, thus improving the reliability of the battery cell. On the other hand, it reduces the risk of the connection between the first tabs of two adjacent battery cells cracking due to excessive expansion of the battery cell in the height direction, thus improving the reliability of the energy storage device.

[0033] In some embodiments, the frame further includes a connector through which two adjacent first partitions are connected to form the receiving space.

[0034] In the above technical solution, two adjacent first separators are connected by a connector, so that the pressure applied to the first separator by the battery cell assembly carried by the first separator can be transmitted to the first separator or the ground below the first separator through the connector, and will not be transmitted to the battery cell assembly below the first separator. This reduces the risk of the bottom battery cell assembly malfunctioning due to excessive pressure and improves the reliability of the energy storage device.

[0035] In some embodiments, the connector includes a first sub-connector and a second sub-connector, one end of the first sub-connector being connected to one of two adjacent first separators, and the second sub-connector being connected to the other of the two adjacent first separators; the other end of the first sub-connector is detachably connected to the other end of the second sub-connector.

[0036] In the above technical solution, the other end of the first sub-connector is detachably connected to the other end of the second sub-connector. Thus, relative to the case where the frame is integrally formed, this structure can disassemble the frame into smaller modules, which facilitates the assembly and disassembly of the frame. On the one hand, it is convenient to put the battery cell assembly into the accommodating space or take out the battery cell assembly; on the other hand, it is convenient to reduce the space occupied by the frame when not assembled, which facilitates the transportation of the frame.

[0037] In some embodiments, the topmost of the plurality of first separators is a first end separator, and the bottommost of the plurality of first separators is a second end separator. The plurality of first separators further includes a middle partition located between the first end separator and the second end separator. The first end separator has a first sub-connector or a second sub-connector on the side facing the second end separator, and the second end separator has a first sub-connector or a second sub-connector on the side facing the first end separator. The middle partition has the first sub-connector and / or the second sub-connector on both sides in the height direction, respectively.

[0038] In the above technical solution, the first end separator is provided with a first sub-connector or a second sub-connector only on the side facing the second end separator, and the second end separator is provided with a first sub-connector or a second sub-connector only on the side facing the first end separator. This reduces the space occupied by the first sub-connector or the second sub-connector in the height direction compared to the case where the first end separator and the second end separator are provided with first sub-connectors or second sub-connectors on both sides. This reduces the space of the frame not used for assembling battery cell modules, thereby increasing the space of the frame used for assembling battery cell modules when the frame volume is fixed, and thus increasing the volumetric energy density of the energy storage device.

[0039] In some embodiments, there are multiple connectors, and the multiple connectors are spaced apart around the periphery of the first separator.

[0040] In the above technical solution, multiple connectors are spaced apart around the periphery of the first partition to uniformly support the first partition and uniformly transfer the pressure borne by the first partition to the first partition located below it, thereby improving the structural stability of the frame and thus improving the reliability of the energy storage device.

[0041] In some embodiments, the frame has a first side and a second side disposed opposite to each other in the width direction of the frame, and the plurality of connectors include a first connector disposed on the first side and a second connector disposed on the second side, the width direction of the frame being perpendicular to the height direction; on a projection plane perpendicular to the width direction of the frame, the orthographic projection of the first connector overlaps at least partially with the battery cell assembly, and the orthographic projection of the second connector overlaps at least partially with the battery cell assembly.

[0042] In the above technical solution, on the projection plane perpendicular to the width direction of the frame, the orthographic projection of the first connector overlaps with at least a portion of the battery cell assembly, and the orthographic projection of the second connector overlaps with at least a portion of the battery cell assembly. This restricts the movement of the battery cell assembly in the width direction of the frame by the first and second connectors, reducing the risk of the battery cell assembly falling out of the housing space along the width direction of the frame, thereby improving the reliability of the energy storage device.

[0043] In some embodiments, the frame has a third side and a fourth side disposed opposite to each other in the length direction of the frame, and the plurality of connectors include a third connector disposed on the third side and a fourth connector disposed on the fourth side, the length direction of the frame being perpendicular to the height direction; on a projection plane perpendicular to the length direction of the frame, the orthographic projection of the third connector overlaps at least partially with the battery cell assembly, and the orthographic projection of the fourth connector overlaps at least partially with the battery cell assembly.

[0044] In the above technical solution, on the projection plane perpendicular to the length direction of the frame, the orthographic projection of the third connector overlaps with at least a portion of the battery cell assembly, and the orthographic projection of the fourth connector overlaps with at least a portion of the battery cell assembly. This restricts the movement of the battery cell assembly in the length direction of the frame by the third and fourth connectors, reducing the risk of the battery cell assembly detaching from the housing space along the length direction of the frame, thereby improving the reliability of the energy storage device.

[0045] In some embodiments, the energy storage device further includes a control compartment, comprising a compartment body, a control module, and a thermal management module. The control module and the thermal management module are housed in the compartment body. The control module is used to perform electrical control on the individual battery cells, and the thermal management module is used to manage the temperature of the individual battery cells.

[0046] In the above technical solution, by setting up a control module, the electrical input or output of the battery cells can be controlled, realizing electrical control of the battery cells; by setting up a thermal management module, the temperature of the battery cells can be managed, reducing the risk of temperature runaway of the battery cells. The compartment can integrate the control module and the thermal management module, which is beneficial for the maintenance of the control module and the thermal management module.

[0047] In some embodiments, the energy storage enclosure includes an enclosure body and an enclosure door. The enclosure body has an interior cavity with an opening, and the enclosure door covers the opening. The enclosure body has a fifth wall extending away from the opening along the length direction of the frame. The inner surface of the fifth wall is recessed along the length direction of the frame to form a recess. The length direction of the frame is perpendicular to the height direction. The frame includes a frame body and a guide portion. The frame body has a third side facing the fifth wall along the length direction of the frame. The guide portion protrudes from the third side along the length direction of the frame and is used to guide it into the recess along the length direction of the frame to limit the position of the frame body.

[0048] In the above technical solution, the guide part is used to guide it to be inserted into the recess along the length direction of the frame, so as to facilitate the assembly of the frame and limit the frame.

[0049] In some embodiments, the energy storage box includes a plurality of second partitions disposed in the receiving cavity, and both ends of the second partitions in the height direction are connected to the box body; the plurality of second partitions are spaced apart along the width direction of the frame to divide the receiving cavity into a plurality of sub-receiving cavities, each of the sub-receiving cavities containing the frame, and the height direction, the length direction of the frame, and the width direction of the frame are perpendicular to each other.

[0050] In the above technical solution, multiple second separators are spaced apart along the width direction of the frame to divide the receiving cavity into multiple sub-receiving cavities. Each sub-receiving cavity contains the frame, thereby reducing the risk of the first tabs of the battery cells of different frames abutting in the width direction of the frame, causing a short circuit inside the energy storage device.

[0051] In some embodiments, along the length of the frame, the frame body has a fourth side, which is disposed opposite to the third side, and the second separator has a fifth side facing the opening; the energy storage device further includes a fifth connector, one end of which is connected to the fourth side, and the other end of which is connected to the fifth side.

[0052] In the above technical solution, one end of the fifth connector is connected to the fourth side, and the other end of the fifth connector is connected to the fifth side. On the one hand, the fifth connector and the fifth wall cooperate to restrict the movement of the frame in the length direction of the frame, reduce the risk of the frame coming out of the sub-accommodating cavity along the length direction of the frame, and improve the reliability of the energy storage device. On the other hand, by restricting the movement of the frame in the width direction of the frame through the fifth connector, the risk of the first tab of the battery cell abutting against the second separator in the width direction of the frame, causing a short circuit inside the energy storage device, is reduced.

[0053] Secondly, embodiments of this application provide an energy storage system, including a power conversion device and an energy storage device provided in any of the embodiments of the first aspect, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0054] Thirdly, embodiments of this application provide a charging network, including a charging pile and an energy storage device provided in any of the embodiments of the first aspect, wherein the charging pile is electrically connected to the energy storage device, and the energy storage device is used to provide power to the charging pile.

[0055] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0057] Figure 1 is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0058] Figure 2 is a schematic diagram of the energy storage system provided in some embodiments of this application;

[0059] Figure 3 is a structural schematic diagram of an energy storage device provided in some embodiments of this application (showing the energy storage box and frame);

[0060] Figure 4 is a structural schematic diagram of an energy storage device provided in some embodiments of this application (showing the frame and battery cell assembly);

[0061] Figure 5 is a cross-sectional view of a first separator provided in some embodiments of this application;

[0062] Figure 6 is a cross-sectional view of another first separator provided in some embodiments of this application;

[0063] Figure 7 is a schematic diagram of the structure of another energy storage device provided in some embodiments of this application (showing the frame and battery cell assembly);

[0064] Figure 8 is a structural schematic diagram of another energy storage device provided in some embodiments of this application (showing the frame and battery cell assembly);

[0065] Figure 9 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0066] Figure 10 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0067] Figure 11 is a cross-sectional view of AA in Figure 4;

[0068] Figure 12 is a schematic diagram of the structure of a battery cell assembly provided in some embodiments of this application;

[0069] Figure 13 is a schematic diagram of the framework provided in some embodiments of this application;

[0070] Figure 14 is a cross-sectional view of a connector provided in some embodiments of this application;

[0071] Figure 15 is a cross-sectional view of another connector provided in some embodiments of this application;

[0072] Figure 16 is an exploded view of the framework provided in some embodiments of this application;

[0073] Figure 17 is a schematic diagram of another framework provided in some embodiments of this application;

[0074] Figure 18 is a structural schematic diagram of an energy storage device provided in some embodiments of this application (showing the energy storage box and control compartment);

[0075] Figure 19 is an enlarged view of point B in Figure 3;

[0076] Figure 20 is a structural schematic diagram of the framework provided in some embodiments of the application from another perspective;

[0077] The accompanying drawings are not drawn to scale.

[0078] Marking Explanation: 1000-Charging Network; 2000-Energy Storage System; 3000-Power Generation Device; 100-Energy Storage Device; 200-Charging Pile; 300-Power Conversion Device; 10-Frame; 101-First Side; 102-Second Side; 103-Third Side; 104-Fourth Side; 1041-Flow Channel; 11-First Separator; 110-Flow Channel; 111-Connecting Pipe; 11A-First End Separator; 11B-Second End Separator; 11C-Middle Separator; 12-Connector; 12A-First Connector; 12B-Second Connector; 12C-Third Connector; 12D-Fourth Connector; 121-First Sub-Connector; 122-Second Sub-Connector; 123-Fastener; 13- Guide section; 14-Frame body; 20-Battery cell assembly; 21-Battery cell; 211-First wall; 212-Second wall; 213-First electrode assembly; 213A-First main body; 213B-First tab; 214-Outer shell; 214A-Third wall; 214B-Fourth wall; 215-Second electrode assembly; 215A-Second main body; 215B-Second tab; 22-First end battery cell; 23-Second end battery cell; 30-Busseter; 40-Binding component; 50-Thermal management module; 60-Energy storage box; 61-Box body; 62-Second separator; 63-Fifth connector; 70-Control compartment; X-Width direction of the frame; Y-Length direction of the frame; Z-Height direction. Detailed Implementation

[0079] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0080] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0081] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0082] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0083] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0084] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0085] 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0086] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0087] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0088] The battery mentioned in the embodiments of this application may include a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0089] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0090] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0091] Optionally, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0092] Optionally, the electrode assembly has a stacked structure.

[0093] Optionally, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0094] In energy storage device assembly schemes, thermal management components are typically incorporated to improve the reliability and stability of the device. These components contain fluids to regulate the temperature of the individual battery cells within the energy storage device. Currently, the thermal management components are housed alongside the battery cells within a space formed by a first partition on the frame. This occupies a portion of the space, reducing the usable volume for each battery cell and consequently decreasing the number of battery cells that can be accommodated within that space, thus lowering the volumetric energy density of the energy storage device.

[0095] Based on the above considerations, in order to improve the volumetric energy density of energy storage devices, this application proposes an energy storage device, including a battery cell assembly, a frame, and an energy storage housing. The battery cell assembly includes at least one battery cell. The frame has a plurality of first partitions spaced apart along the height direction, forming a receiving space between adjacent first partitions. Each receiving space contains a battery cell assembly, and the first partition at the bottom of the receiving space is used to support the battery cell assembly. The energy storage housing has a receiving cavity, and the frame is housed within the receiving cavity. In particular, at least one of the adjacent first partitions is a thermal management component used to regulate the temperature of the battery cell.

[0096] In this type of energy storage device, at least one of the two adjacent first separators is a thermal management component. The thermal management component is used to regulate the temperature of the battery cells. On the one hand, this allows at least one of the two separators adjacent to the battery cell assembly to regulate the temperature of the battery cells in the battery cell assembly, thereby reducing the risk of the battery cell assembly becoming too hot due to heat generation during battery cell discharge and charging, thus improving the reliability of the energy storage device. On the other hand, by setting the first separator as a thermal management component, there is no need to set up an additional thermal management component in the housing space, reducing the space occupied by the thermal management component and allowing more space to be used to accommodate the battery cell assembly, thereby increasing the volumetric energy density of the energy storage device.

[0097] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electricity, and then store it in energy storage devices. Solar power generation systems can convert solar energy into electricity, store it in energy storage devices, and supply it to users as needed. Mobile power systems can supply power to electrical equipment in areas inaccessible by the mains grid, such as remote mountainous areas and isolated wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0098] Please refer to Figure 1, which is a schematic diagram of the structure of a charging network 1000 provided in some embodiments of this application. This application provides a charging network 1000, which includes a charging pile 200 for charging electrical equipment. The charging network 1000 may also include an energy storage device 100, which is electrically connected to the charging pile 200 and provides power to the charging pile 200.

[0099] It should be noted that the charging pile 200 and the battery cells in the energy storage device 100 are electrically connected via cables, and the battery cells can supply their stored electrical energy to the charging pile 200. The charging pile 200 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's energy. The application of the energy storage device 100 in this charging network 1000 can effectively improve the safety of the charging network 1000 and also help to improve the flexibility of the charging network 1000 during deployment.

[0100] In a charging network 1000, there can be one charging pile 200, and the energy storage device 100 provides power to the one charging pile 200; there can also be multiple charging piles 200, and the energy storage device 100 provides power to multiple charging piles 200.

[0101] The energy storage device 100 may include a container, the container including individual battery cells, which are electrically connected to the charging pile 200 so that the battery can provide power to the charging pile 200.

[0102] As an example, as shown in Figure 1, the charging network 1000 includes an energy storage device 100 and two charging piles 200, with the energy storage device 100 providing power to the two charging piles 200.

[0103] Please refer to Figure 2, which is a schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of this application. This application provides an energy storage system 2000. The energy storage system 2000 includes a power conversion device 300, which 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 system 2000 may also include an energy storage device 100, which is electrically connected to the power conversion device 300. The power conversion device 300 converts the electrical energy provided by the power generation device 3000 and stores it in the energy storage device 100.

[0104] A power conversion device is used to connect 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. The application of the energy storage device 100 in the energy storage system 2000 can effectively improve the operational safety of the energy storage system 2000. In specific implementations, the power generation equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of power generation equipment.

[0105] As an example, as shown in Figure 2, the energy storage system 2000 includes an energy storage device 100 and a power conversion device 300. The two power generation devices 3000 respectively transmit the generated electrical energy to the power conversion device 300, and the power conversion device 300 imports the electrical energy into the energy storage device 100 for storage.

[0106] Please refer to Figures 3 and 4, and Figures 5 and 6. Figure 3 is a structural schematic diagram of an energy storage device provided in some embodiments of this application (showing the energy storage box and frame). Figure 4 is a structural schematic diagram of an energy storage device 100 provided in some embodiments of this application (showing the frame 10 and battery cell assembly 20). Figures 5 and 6 are cross-sectional views of two types of first separators 11 provided in some embodiments of this application. This application provides an energy storage device 100, including a battery cell assembly 20, a frame 10, and an energy storage box 60. The battery cell assembly 20 includes at least one battery cell 21. The frame 10 has a plurality of first separators 11 spaced apart along the height direction Z, forming a receiving space between adjacent first separators 11. Each receiving space accommodates a battery cell assembly 20, and the first separator 11 located at the bottom of the receiving space is used to support the battery cell assembly 20. The energy storage box 60 has a receiving cavity, in which the frame 10 is accommodated. Among the two adjacent first separators 11, at least one first separator 11 is a thermal management component, which is used to regulate the temperature of the battery cell 21.

[0107] The battery cell assembly 20 may be composed of one or more battery cells 21. In some embodiments, the battery cell assembly 20 may be composed of multiple battery cells 21, which may be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 21 may be connected in both series and parallel. Multiple battery cells 21 may be directly connected in series, parallel, or a combination thereof to form the battery cell assembly 20; alternatively, multiple battery cells 21 may first be connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules may be connected in series, parallel, or a combination thereof to form a battery cell assembly 20.

[0108] The battery cell 21 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.

[0109] A single battery cell 21 generally includes a first electrode assembly 213. The first electrode assembly 213 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the single battery cell 21, 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 the positive and negative electrodes, while allowing active ions to pass through.

[0110] In some embodiments, the battery cell 21 may include a housing 214. The housing 214 is used to encapsulate the first electrode assembly 213 and components such as the electrolyte. The housing 214 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 214), or an aluminum-plastic film, etc.

[0111] As an example, the battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0112] The frame 10 is a structural component for housing the battery cell assembly 20. Exemplarily, the frame 10 may be used to house one or more battery cell assemblies 20, each of which may be detachably connected to the frame 10.

[0113] The energy storage enclosure 60 is a component used to provide a stable operating environment for the individual battery cells. For example, the energy storage enclosure 60 can be a shipping container.

[0114] Understandably, since the energy storage box 60 is provided, there is no need to provide additional coverings between adjacent pairs of first separators 11 to cover the containing space, thereby reducing the number of parts in the energy storage device 100 and lowering the production cost of the energy storage device 100. At the same time, the containing space and the containing cavity are connected, which facilitates gas exchange between the containing space and the containing cavity, and facilitates heat exchange between the containing space and the containing cavity. This further reduces the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging process of the battery cell 21, thereby improving the reliability of the energy storage device 100.

[0115] In some embodiments, referring to FIG3, the energy storage box 60 is a cuboid structure, the length direction of the energy storage box 60 is parallel to the width direction X of the frame, the width direction of the energy storage box 60 is parallel to the length direction Y of the frame, and the frame 10 consists of a plurality of frames spaced apart in the receiving cavity along the width direction X of the frame 10.

[0116] The first separator 11 is a structural component in the frame 10 used to separate two adjacent battery cell modules 20 in the height direction Z or to separate the outside world from the battery cell module 20 in the height direction Z. The first separator 11 is generally made of metal to have high strength and rigidity, thereby reducing the risk of deformation of the frame 10 when the first separator 11 is subjected to a large load.

[0117] In some embodiments, referring to Figures 5 and 6, the first partition 11 may be plate-shaped, with the length direction Y and width direction X of the frame both perpendicular to the height direction Z, thereby forming an accommodating space between two adjacent first partitions 11.

[0118] The first partition 11 located at the bottom of the housing space is used to support the battery cell assembly 20. This means that the battery cell assembly 20 located in the housing space directly abuts against the first partition 11 in the height direction Z, or abuts against it through an insulating member, so that the weight of the battery cell assembly 20 directly acts on the first partition 11 located at the bottom of the housing space. That is, the first partition 11 located at the bottom of the housing space provides a supporting force to the battery cell 21 to restrict the movement of the battery cell assembly 20 in the height direction Z.

[0119] The thermal management component is a component that can cool or heat the battery cells 21 in the battery cell assembly 20.

[0120] In some embodiments, referring to Figures 4 and 5, the thermal management component has a flow channel 110 inside, which is used to contain a medium to regulate the temperature of the battery cell 21.

[0121] In some embodiments, the thermal management component may employ a containment medium to regulate the temperature of the battery cell 21 by means of heat exchange with the battery cell 21.

[0122] The thermal management component can contain a fluid or a solid-liquid phase change material to regulate the temperature of the battery cell 21. Specifically, the fluid can be a liquid or a gas. The solid-liquid phase change material is initially a solid and can become a liquid after absorbing heat.

[0123] Temperature regulation refers to heating or cooling the battery cell 21. For example, when the battery cell 21 is cooled or cooled down, the thermal management component is used to contain cooling fluid or solid-liquid phase change material to reduce the temperature of the battery cell 21. In this case, the thermal management component can also be called a cooling component, cooling system or cooling plate, etc., and the fluid contained therein can also be called a cooling medium or cooling fluid, more specifically, it can be called coolant or cooling gas.

[0124] Alternatively, the thermal management component can also be used to heat the battery cell 21, but this embodiment is not limited to this. Optionally, the fluid can be circulated to achieve better temperature regulation. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0125] Flow channel 110 refers to the part that can accommodate fluid or solid-liquid phase change material and allow the fluid or solid-liquid phase change material to flow.

[0126] Flow channel 110 refers to a portion that can contain and allow the medium to flow. In some embodiments, the thermal management component is connected to the thermal management module 50 of the energy storage device 100 via a connector. The medium storage device (e.g., a water tank) in the energy storage device 100 provides the medium to the thermal management component and enables the medium to circulate between the thermal management component and the medium storage device. Exemplarily, when it is necessary to heat the battery cell 21, the medium in the medium storage device flows out and is heated. The heated medium can flow into the thermal management component to heat the battery cell 21 in the battery cell assembly 20, and then flow back to the medium storage device.

[0127] In some embodiments, the thermal management component can be a water-cooled plate, which can cool the battery cell 21 by introducing water at a lower temperature and heat the battery cell 21 by introducing water at a higher temperature.

[0128] In some embodiments, the water-cooled plate may be formed by stacking two plate-like members, and grooves may be formed on the surfaces of the plate-like members facing each other, so that the grooves form a flow channel 110 that allows the medium to flow through.

[0129] In some embodiments, the thermal management component may be a roll forming element.

[0130] In some embodiments, please refer to FIG5, the flow channel 110 inside the thermal management component is harmonica-shaped so that the contact area between the medium and the battery cell 21 is large.

[0131] In some embodiments, referring to Figure 6, the flow channel 110 inside the thermal management component can be arranged in a roundabout manner so that the contact area between the medium and the battery cell 21 is larger.

[0132] The first separator 11 is a thermal management component. It can be understood that the first separator 11 has the aforementioned flow channel 110 inside so that the first separator 11 has the ability to regulate the temperature of the battery cell 21. It can also be understood that the thermal management component is used as the first separator 11 to support the battery cell assembly 20.

[0133] In two adjacent first partitions 11, at least one first partition 11 is a thermal management component. This can be understood as one of the two adjacent first partitions 11 in the height direction Z being a thermal management component, and the other being either a thermal management component or not.

[0134] In this embodiment, at least one of the two adjacent first separators 11 is a thermal management component. The thermal management component is used to regulate the temperature of the battery cell 21. On the one hand, this allows at least one of the two separators adjacent to the battery cell assembly 20 to regulate the temperature of the battery cell 21 in the battery cell assembly 20, thereby reducing the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging process of the battery cell 21, thus improving the reliability of the energy storage device 100. On the other hand, by setting the first separator 11 as a thermal management component, there is no need to set an additional thermal management component in the housing space, reducing the space occupied by the thermal management component and allowing the housing space to have more space to accommodate the battery cell assembly 20, thereby increasing the volumetric energy density of the energy storage device 100. Meanwhile, since the first separator 11 is spaced apart, the accommodating space and the accommodating cavity are connected, which facilitates gas exchange between the accommodating space and the accommodating cavity, and facilitates heat exchange between the accommodating space and the accommodating cavity. This further reduces the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging process of the battery cell 21, thereby improving the reliability of the energy storage device 100.

[0135] According to some embodiments of this application, each first partition 11 is a thermal management component.

[0136] Understandably, each of the first separators 11 is a thermal management component, so that the battery cell assembly 20 has thermal management components on both sides of the opposite sides in the height direction Z, thereby increasing the temperature regulation efficiency of the thermal management components for the battery cells 21 in the battery cell assembly 20.

[0137] In this embodiment, the first separator 11 is a thermal management component, so that the first separator 11 at the top of the battery cell assembly 20 and the first separator 11 at the bottom of the battery cell 21 can regulate the temperature of the battery cell 21 in the battery cell assembly 20, thereby improving the temperature regulation efficiency and further reducing the risk of the battery cell assembly 20 being too hot due to heat generation during the discharge and charging process of the battery cell 21, so as to improve the reliability of the energy storage device 100.

[0138] Referring to Figure 3, according to some embodiments of this application, the energy storage device 100 further includes a connecting pipe (not shown in the figure) and a thermal management module; one end of the connecting pipe (not shown in the figure) is connected to the first separator 11 and communicates with the flow channel 110 inside the first separator 11; the other end of the connecting pipe 111 is connected to the thermal management module 50 so that the flow channel 110 of the first separator 11 is in fluid communication with the thermal management module 50, and the thermal management module 50 is used to manage the temperature of the battery cell 21.

[0139] In this embodiment, the flow channel 110 of the first separator 11 is fluidly connected to the thermal management module 50 through a connecting pipe (not shown in the figure). By setting the thermal management module 50, the thermal management module 50 can manage the temperature of the battery cell and reduce the risk of temperature runaway of the battery cell.

[0140] Please refer to Figure 4, and also to Figures 7 and 8, which are schematic diagrams of the structures of two other energy storage devices 100 provided in some embodiments of this application (showing the frame 10 and the battery cell assembly 20). According to some embodiments of this application, the battery cell assembly 20 includes a plurality of battery cells 21, at least one of the battery cells 21 is in contact with a first partition 11 located at the top of the receiving space, and at least one of the battery cells 21 abuts against the first partition 11 located at the bottom of the receiving space.

[0141] The battery cell assembly 20 includes a plurality of battery cells 21. Exemplarily, the plurality of battery cells 21 can be stacked in any direction to facilitate the grouping and assembly of the battery cell assembly 20.

[0142] In some embodiments, referring to FIG4, the battery cell assembly 20 includes a plurality of battery cells 21, which are stacked along the height direction Z.

[0143] In some embodiments, referring to FIG7, the battery cell assembly 20 includes a plurality of battery cells 21, which are stacked along the length direction Y of the frame.

[0144] In some embodiments, referring to FIG8, the battery cell assembly 20 includes a plurality of battery cells 21, which are stacked along the width direction X of the frame.

[0145] The contact between at least one battery cell 21 and the first partition 11 located at the top of the receiving space can be understood as the contact between at least one battery cell 21 and the first partition 11 located at the top of the receiving space to provide mutual compressive force; it can also be understood as the contact between at least one battery cell 21 and the first partition 11 located at the top of the receiving space not providing mutual compressive force.

[0146] For example, the battery cell 21 and the first partition 11 located at the top of the receiving space can directly abut against each other, or indirectly abut against each other through structural components such as insulating components, that is, the battery cell 21 and the first partition 11 located at the top of the receiving space provide mutual compressive force; the battery cell 21 and the first partition 11 located at the top of the receiving space can directly contact each other, or indirectly contact each other through structural components such as insulating components, that is, the battery cell 21 and the first partition 11 located at the top of the receiving space do not provide mutual compressive force.

[0147] For example, the battery cell 21 can directly abut against the first partition 11 located at the bottom of the receiving space, or it can abut against the partition through an insulating member.

[0148] In an embodiment where one of the two adjacent first separators 11 is a thermal management component, at least one of the multiple battery cells 21 contacts the first separator 11 that is a thermal management component to improve the temperature regulation efficiency of the first separator 11 on the battery cell 21. In particular, the temperature regulation efficiency of the first separator 11 on the battery cell assembly 20 is highest when all the battery cells 21 in the battery cell assembly 20 are in contact with the first separator 11.

[0149] In embodiments where all first separators 11 are thermal management components, at least one of the plurality of battery cells 21 abuts against one of the first separators 11 to improve the temperature regulation efficiency of the first separator 11 for the battery cell 21. At least one of the plurality of battery cells 21 abuts against another first separator 11 to improve the temperature regulation efficiency of the other first separator 11 for the battery cell 21. In particular, when all battery cells 21 in the battery cell assembly 20 abut against two adjacent first separators 11, the temperature regulation efficiency of the two adjacent first separators 11 for the battery cells 21 in the battery cell assembly 20 is the highest.

[0150] In this embodiment, at least one of the multiple battery cells 21 abuts against the first partition 11 located at the top of the housing space, thereby improving the temperature regulation capability of the first partition 11 located at the top of the housing space for the battery cell 21 it abuts against, thereby further reducing the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging process of the battery cell 21; at least one of the multiple battery cells 21 abuts against the first partition 11 located at the bottom of the housing space, thereby improving the temperature regulation capability of the first partition 11 located at the top of the housing space for the battery cell 21 it abuts against, thereby further reducing the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging process of the battery cell 21, thus improving the reliability of the energy storage device 100.

[0151] Please refer to Figure 4 and Figure 9, which is a schematic diagram of the structure of a battery cell 21 provided in some embodiments of this application. According to some embodiments of this application, multiple battery cells 21 in a battery cell assembly 20 are stacked along the height direction Z. Each battery cell 21 has a first wall 211 and a second wall 212 disposed opposite to each other in the height direction Z. The topmost of the multiple battery cells 21 is a first end battery cell 22, and the first wall 211 of the first end battery cell 22 contacts a first partition 11 located at the top of the receiving space. The bottommost of the multiple battery cells 21 is a second end battery cell 23, and the second wall 212 of the second end battery cell 23 abuts against the first partition 11 located at the bottom of the receiving space.

[0152] The first wall 211 is a wall portion of the battery cell 21 in the height direction Z, and the second wall 212 is another wall portion of the battery cell 21 in the height direction Z. The first wall 211 and the second wall 212 are arranged opposite to each other in the height direction Z.

[0153] The first end battery cell 22 refers to a battery cell 21 located at one end of a plurality of battery cells 21 in the height direction Z. The first end battery cell 22 is closer to the first partition 11 located at the top of the housing space than the other battery cells 21.

[0154] The second end battery cell 23 refers to the battery cell 21 located at another end of the plurality of battery cells 21 in the height direction Z. The first end battery cell 22 and the second end battery cell 23 are arranged opposite to each other. The second end battery cell 23 is closer to the first partition 11 located at the bottom of the housing space than the other battery cells 21.

[0155] Understandably, the first wall 211 of the first end battery cell 22 abuts against the first partition 11 located at the top of the receiving space. On the one hand, this allows the first partition 11 located at the top of the receiving space to provide support to the first wall 211 of the first end battery cell 22. This restricts the movement of the first wall 211 of the first end battery cell 22 in the height direction Z when the first end battery cell 22 expands, or when the expansion of the remaining battery cells 21 in the battery cell assembly 20 in the height direction Z causes the first wall 211 of the first end battery cell 22 to tend to move in the height direction Z. This restricts the expansion of the battery cells 21 in the height direction Z within the battery cell assembly 20. On the other hand, this allows the first partition 11 located at the top of the receiving space to have surface contact with the first end battery cell 22, thereby improving the temperature regulation efficiency of the first partition 11 located at the top of the receiving space for the first end battery cell 22.

[0156] The second wall 212 of the second end battery cell 23 abuts against the first partition 11 located at the bottom of the receiving space. On the one hand, the first partition 11 located at the bottom of the receiving space can provide support to the second wall 212 of the second end battery cell 23, so that when the second end battery cell 23 expands in the height direction Z, or when the expansion of the other battery cells 21 in the battery cell assembly 20 in the height direction Z causes the second wall 212 of the second end battery cell 23 to tend to move in the height direction Z, the first partition 11 located at the bottom of the receiving space can restrict the movement of the second wall 212 of the second end battery cell 23 in the height direction Z, thereby restricting the expansion of the battery cells 21 in the height direction Z in the battery cell assembly 20. On the other hand, the first partition 11 located at the bottom of the receiving space and the second end battery cell 23 are in surface contact, thereby improving the temperature regulation efficiency of the first partition 11 located at the bottom of the receiving space for the second end battery cell 23.

[0157] In summary, the two adjacent first separators 11 can serve as end plates and housings to restrict the expansion of the battery cell assembly 20, thus eliminating the need to install end plates and housings within the housing space, thereby facilitating the assembly of the energy storage device 100.

[0158] The contact between the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the receiving space can be understood as the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the receiving space contacting each other to provide mutual compressive force; it can also be understood as the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the receiving space contacting each other without providing mutual compressive force.

[0159] For example, the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the receiving space can directly abut against each other, or indirectly abut against each other through structural components such as insulating components, that is, the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the receiving space provide mutual compressive force; the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the receiving space can directly contact each other, or indirectly contact each other through structural components such as insulating components, that is, the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the receiving space do not provide mutual compressive force.

[0160] For example, the second wall 212 of the second end battery cell 23 can directly abut against the first partition 11 located at the bottom of the receiving space, or it can abut against the partition through an insulating member.

[0161] In some embodiments, adjacent battery cells 21 of the plurality of battery cells 21 abut against each other. On the one hand, this allows the reaction force exerted by the two adjacent first separators 11 on the first end battery cell 22 and the second end battery cell 23 to resist expansion force to be sequentially transmitted to the adjacent battery cells 21 through the first end battery cell 22 and the second end battery cell 23, thereby helping to limit the expansion of the battery cells 21 located between the first end battery cell 22 and the second end battery cell 23 in the battery cell assembly 20. On the other hand, it facilitates the thermal connection between the first separators 11 and the battery cells 21 located between the first end battery cell 22 and the second end battery cell 23 through the first end battery cell 22 and / or the second end battery cell 23, thereby achieving temperature regulation of the battery cells 21 in the battery cell assembly 20, which helps to reduce the temperature of the battery cells 21 located between the first end battery cell 22 and the second end battery cell 23 in the battery cell assembly 20, thereby improving the reliability of the energy storage device 100.

[0162] For example, adjacent battery cells 21 in a plurality of battery cells 21 can be directly abutted or abutted by an insulating member.

[0163] In this embodiment, multiple battery cells 21 are stacked along the height direction Z, with the first end battery cell 22 abutting against the first partition 11 located at the top of the receiving space, and the second end battery cell 23 abutting against the first partition 11 located at the bottom of the receiving space. This allows two adjacent first partitions 11 to abut against the battery cells 21 at both ends of the battery cell assembly 20 along the height direction Z. On one hand, the first partitions 11 restrict the expansion of the battery cells 21 along the height direction Z, reducing the risk of the outer casing 214 of the battery cell 21 breaking due to excessive expansion and deformation, thus improving the reliability of the battery cells 21. On the other hand, the adjacent first partitions 11 directly... The first separator 11 abuts against the battery cell assembly 20 to limit its movement in the height direction Z, thus eliminating the need for structural components (such as a housing) to restrict the movement of the battery cell assembly 20 within the housing space. This reduces the space occupied by limiting structural components, allowing more space to be used to accommodate the battery cell assembly 20, thereby increasing the volumetric energy density of the energy storage device 100. Furthermore, it allows both adjacent first separators 11 to abut against the battery cell assembly 20, thereby improving the temperature regulation efficiency of the first separators 11 on the battery cells 21 within the battery cell assembly 20. This further reduces the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging processes of the battery cells 21, thus improving the reliability of the energy storage device 100.

[0164] Please refer to Figure 9 and Figure 10, which is an exploded view of the structure of a battery cell 21 provided in some embodiments of this application. According to some embodiments of this application, the first wall 211 and the second wall 212 are the walls with the largest area of ​​the battery cell 21.

[0165] Understandably, the first wall 211 is the wall portion with the largest area of ​​the battery cell 21, in order to increase the contact area between the battery cell 21 and the first separator 11, and to increase the contact area between the battery cells 21, thereby increasing the area for heat exchange between the battery cell 21 and the first separator 11, and simultaneously increasing the area for heat exchange between the battery cells 21, thereby increasing the heat exchange efficiency between the thermal management component and the battery cell 21, and further reducing the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging process of the battery cells 21.

[0166] In some embodiments, referring to FIG10, the battery cell 21 includes a housing 214 and a first electrode assembly 213. The first electrode assembly 213 is housed within the housing 214. The first electrode assembly 213 includes a positive electrode and a negative electrode. The first electrode assembly 213 has a flat region. The portion of the positive electrode located in the flat region and the portion of the negative electrode located in the flat region are stacked along the height direction Z.

[0167] The housing 214 is a component for accommodating the first electrode assembly 213. The housing 214 can also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, a receiving cavity is formed inside the housing 214 for accommodating the first electrode assembly 213.

[0168] The outer casing 214 can be made of metal or a combination of metal and non-metal. For example, the outer casing 214 can be made of metal, such as aluminum, copper, iron, steel, or aluminum alloy. Alternatively, some parts of the outer casing 214 can be made of metal, while the rest can be made of non-metal. For instance, the end caps of the outer casing 214 can be made of metal, while other parts of the outer casing 214 can be made of non-metallic materials. The outer casing 214 can be adapted to the shape of the first electrode assembly 213. For example, in Figure 10, the first electrode assembly 213 has a cuboid structure, so a cuboid structure outer casing 214 can be selected.

[0169] The first electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs.

[0170] Understandably, since the flat area of ​​the first electrode assembly 213 is prone to expansion, and since the positive electrode portion and the negative electrode portion located in the flat area are stacked along the height direction Z, when the first electrode assembly 213 expands due to long-term use, the expansion force exerted by the first electrode assembly 213 on the first wall 211 and the second wall 212 in the height direction Z is greater than the expansion force exerted by the first electrode assembly 213 on the casing in other directions. Therefore, the expansion amount of the battery cell 21 and the battery cell assembly 20 in the height direction Z is greater than that in other directions, thus requiring greater expansion restriction.

[0171] In this embodiment, the first wall 211 and the second wall 212 are the wall portions with the largest area of ​​the battery cell 21. On the one hand, the first wall 211 and the second wall 212 have the largest area, thereby maximizing the expansion deformation of the battery cell 21 in the height direction Z. By abutting the first wall 211 of the first end battery cell 22 against the first partition 11 located at the top of the receiving space, and abutting the second wall 212 of the second end battery cell 23 against the first partition 11 located at the bottom of the receiving space, the deformation of the battery cell 21 in the direction of maximum deformation is better restricted. This further reduces the risk of the outer casing 214 of the battery cell 21 breaking due to excessive expansion and deformation of the battery cell 21, leading to sealing failure of the outer casing 214 of the battery cell 21, and improves the sealing performance. The reliability of the battery cell 21; on the other hand, the first wall 211 and the second wall 212 are the walls with the largest area, thereby increasing the contact area between the first end battery cell 22 and the second end battery cell 23 and the first separator 11, compared to the case where the first end battery cell 22 and the second end battery cell 23 use other walls to abut against the first separator 11. This increases the area for heat exchange between the first separator 11 and the battery cell assembly 20, thereby further improving the temperature regulation efficiency of the first separator 11 on the battery cells 21 in the battery cell assembly 20. This further reduces the risk of the battery cell assembly 20 overheating due to heat generation during the discharge and charging process of the battery cells 21, thereby improving the reliability of the energy storage device 100.

[0172] According to some embodiments of this application, referring to FIG10, a battery cell 21 includes a housing 214 and a first electrode assembly 213. The first electrode assembly 213 is housed within the housing 214 and includes two first tabs 213B with opposite polarities. The housing 214 has a third wall 214A and a fourth wall 214B disposed opposite to each other in the width direction X of the frame 10. One end of each of the two first tabs 213B is disposed outside the third wall 214A and the fourth wall 214B, respectively. The width direction X of the frame is perpendicular to the height direction Z. The first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 are connected to electrically connect the first electrode assemblies 213 of the two adjacent battery cells 21.

[0173] The first electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs. The structure of the first electrode assembly 213 can be varied. Exemplarily, the first electrode assembly 213 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode. It can also be a stacked structure formed by stacking the positive electrode, the separator, and the negative electrode. Exemplarily, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0174] In some embodiments, referring to FIG10, the first electrode assembly 213 includes a first body 213A and two first tabs 213B.

[0175] The first main body 213A is the region in which the first electrode assembly 213 undergoes a chemical reaction within the battery cell 21. The first main body 213A is a structure formed by winding together the region of the positive electrode plate coated with a positive active material layer, the separator, and the region of the negative electrode plate coated with a negative active material layer. It mainly relies on the movement of metal ions between the positive and negative electrode plates with opposite polarities to work.

[0176] The two first tabs 213B are portions of the first electrode assembly 213 used to guide current into the first body 213A and out of the first body 213A, respectively. For example, one of the two first tabs 213B is used to guide current into the first body 213A, and the other of the two first tabs 213B is used to guide current out of the first body 213A.

[0177] In this embodiment, by connecting the first tabs 213B of two adjacent battery cells 21 in the height direction Z, the two adjacent battery cells 21 in the height direction Z are electrically connected. This eliminates the need for additional structural components to electrically connect the two adjacent battery cells 21. Compared to the case where the first tabs 213B of the two adjacent battery cells 21 are connected using a busbar 30, on the one hand, the production cost of the energy storage device 100 is reduced; on the other hand, it facilitates the assembly of the energy storage device 100 and improves the production efficiency of the energy storage device 100.

[0178] Referring to Figures 9 and 10, according to some embodiments of this application, the battery cell 21 further includes a second electrode assembly 215, which is housed within the housing 214. The first electrode assembly 213 and the second electrode assembly 215 are spaced apart along the length Y direction of the frame. The second electrode assembly 215 includes two second tabs 215B with opposite polarities, one end of which is respectively disposed outside the third wall 214A and the fourth wall 214B. The second tabs 215B of two adjacent battery cells 21 in the battery cell assembly 20 are connected to electrically connect the second electrode assemblies 215 of the two adjacent battery cells 21.

[0179] The second electrode assembly 215 is the component in the battery cell 21 where the electrochemical reaction occurs. The structure of the second electrode assembly 215 can be varied. Exemplarily, the second electrode assembly 215 can be a wound structure formed by winding a positive electrode, a separator, and a negative electrode. It can also be a stacked structure formed by stacking the positive electrode, the separator, and the negative electrode. Exemplarily, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0180] In some embodiments, referring to FIG10, the second electrode assembly 215 includes a second body 215A and two second tabs 215B.

[0181] The second body 215A is the region in which the second electrode assembly 215 undergoes a chemical reaction within the battery cell 21. The second body 215A is a structure formed by winding together the region of the positive electrode sheet coated with a positive active material layer, the separator, and the region of the negative electrode sheet coated with a negative active material layer. It mainly relies on the movement of metal ions between the positive and negative electrode sheets with opposite polarities to work.

[0182] The two second tabs 215B are portions of the second electrode assembly 215 used to guide current into the second body 215A and out of the second body 215A, respectively. For example, one of the two second tabs 215B is used to guide current into the second body 215A, and the other of the two second tabs 215B is used to guide current out of the second body 215A.

[0183] In some embodiments, the battery cell 21 further includes an insulating member located between the second body 215A and the first body 213A in the length direction Y of the frame, so as to insulatingly isolate the second body 215A and the first body 213A.

[0184] Understandably, the battery cell 21 may also include multiple electrode assemblies such as a third electrode assembly and a fourth electrode assembly, with multiple electrode assemblies spaced apart along the length Y of the frame.

[0185] In this embodiment, the first electrode assembly 213 and the second electrode assembly 215 are spaced apart along the length direction Y of the frame, thereby making reasonable use of the space in the length direction Y of the frame. By connecting the second tabs 215B of two adjacent battery cells 21 in the height direction Z, the second electrode assemblies 215 of the two adjacent battery cells 21 in the height direction are electrically connected. This eliminates the need for additional structural components to electrically connect the second electrode assemblies 215 of the two adjacent battery cells. Compared with the case where a busbar is used to connect the second tabs 215B of the two adjacent battery cells, on the one hand, the production cost of the energy storage device 100 is reduced; on the other hand, it facilitates the assembly of the energy storage device 100 and improves the production efficiency of the energy storage device 100.

[0186] Please refer to Figure 11, which is a cross-sectional view of AA in Figure 4. According to some embodiments of this application, along the width direction X of the frame, the frame 10 has a first side 101 and a second side 102 disposed opposite to each other, and a portion of one of the two first tabs 213B extends beyond the first side 101, while a portion of the other extends beyond the second side 102.

[0187] In some embodiments, two adjacent battery cells 21 in the height direction Z have the same polarity in the first tabs 213B on the same side of the frame in the width direction X. The two first tabs 213B are electrically connected to be connected in parallel to the two adjacent battery cells 21 in the height direction Z.

[0188] In some embodiments, two adjacent battery cells 21 in the height direction Z have opposite polarities in the first tabs 213B on the same side of the frame in the width direction X, and the two first tabs 213B are electrically connected to connect the two adjacent battery cells 21 in the height direction Z in series.

[0189] In this embodiment, a portion of one of the two first tabs 213B extends beyond the first side 101, and a portion of the other extends beyond the second side 102. Thus, with a fixed length of the first tab 213B, the space occupied by the first tab 213B within the accommodating space is reduced, allowing the accommodating space to have more space to accommodate the first electrode assembly 213 of the battery cell 21, thereby increasing the volumetric energy density of the energy storage device 100.

[0190] Please refer to Figure 11. According to some embodiments of this application, the first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 are welded together.

[0191] The first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 are welded together. That is, a portion of the first tab 213B of one battery cell 21 and a portion of the first tab 213B of the other battery cell are fused together and then fixedly connected. Alternatively, a portion of the first tab 213B of one battery cell 21 and a portion of the first tab 213B of the other battery cell, along with the welding material, are fused together and then fixedly connected, so that a portion of the first tab 213B of one battery cell 21 and a portion of the first tab 213B of the other battery cell are fused into one piece. For example, the welding method of the first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 can be various. For example, the first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 can be partially melted by laser welding to achieve welding between the first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20. Alternatively, the first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 can be partially melted by ultrasonic welding to achieve welding between the first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20.

[0192] In the embodiment where the first wall 211 of the first end battery cell 22 and the second wall 212 of the second end battery cell 23 respectively abut against two adjacent first separators 11, the reaction force applied by the two adjacent first separators 11 to the first end battery cell 22 and the second end battery cell 23 to resist the expansion force can be transmitted to the adjacent battery cell 21 through the first end battery cell 22 and the second end battery cell 23 in sequence. This helps to limit the expansion of the battery cell 21 located between the first end battery cell 22 and the second end battery cell 23 in the battery cell assembly 20, thereby reducing the risk of cracking at the weld of the first tab 213B and improving the reliability of the energy storage device 100.

[0193] In this embodiment, the first tabs 213B of two adjacent battery cells 21 are connected by welding, which can effectively improve the connection strength and reliability between the first tabs 213B of the two battery cells 21. This helps to reduce the risk of the first tabs 213B of the two battery cells 21 falling off each other during use, thereby improving the reliability of the energy storage device 100.

[0194] Please refer to Figures 3 and 4, and Figures 7 and 8. According to some embodiments of this application, the accommodating spaces are multiple units arranged along the height direction Z. The frames 10 are multiple units spaced apart along the width direction X of the frames.

[0195] Understandably, two adjacent accommodating spaces are separated by a first partition 11.

[0196] In this embodiment, multiple accommodating spaces are arranged along the height direction. Therefore, when the size of each accommodating space in the height direction Z of the frame 10 is fixed, compared to the case where each frame 10 has only one accommodating space, the space of the frame 10 in the height direction Z is utilized more rationally. This allows the frame 10 to accommodate more battery cell modules, and thus more battery cells 21, thereby increasing the energy density of the energy storage device 100. Similarly, multiple frames 10 are spaced apart along the width direction X of the frame. Therefore, when the size of the energy storage box 60 in the width direction X of the frame is fixed, compared to the case where each energy storage box 60 accommodates only one frame 10, the space of the energy storage box 60 in the width direction X of the frame is utilized more rationally. This allows the energy storage box 60 to accommodate more battery cell modules 20, and thus more battery cells 21, thereby increasing the energy density of the energy storage device 100.

[0197] Referring to Figure 11, according to some embodiments of this application, the energy storage device 100 further includes a busbar 30 for electrically connecting two adjacent battery cell assemblies 20.

[0198] Understandably, because a first separator 11 is provided in two adjacent battery cell assemblies 20 in the height direction Z, the two adjacent battery cell assemblies 20 have a certain distance in the height direction Z, which makes it inconvenient to connect them directly through the first tab 213B.

[0199] The busbar 30 is a component that can connect two adjacent battery cell modules 20 in series or in parallel to achieve an electrical connection between the two battery cell modules 20. The busbar 30 can also be called a busbar, busbar sheet, or busbar bar, and is generally a thin metal sheet.

[0200] For example, one end of the busbar 30 is welded to the first tab 213B of the first end battery cell 22 of the lower one of the two adjacent battery cell assemblies 20, and the other end of the busbar 30 is welded to the first tab 213B of the second end battery cell 23 of the upper one of the two adjacent battery cell assemblies 20, so that the two adjacent battery cell assemblies 20 are connected in series or in parallel.

[0201] In this embodiment, two adjacent battery cell assemblies 20 are connected by a busbar 30, thereby facilitating the output of current from multiple battery cell assemblies 20.

[0202] Referring to Figure 12, according to some embodiments of this application, the energy storage device 100 further includes a strapping member 40, which is sleeved on the outer periphery of the battery cell assembly 20.

[0203] The strapping member 40 is a structural member used to be fitted around the outer periphery of the battery cell assembly 20 to improve the integrity of the multiple battery cells 21 in the battery cell assembly 20.

[0204] For example, the strapping 40 is typically manufactured in a ring shape, and multiple battery cells 21 are bundled together using the fixed-size strapping 40.

[0205] In some embodiments, referring to FIG12, the winding axis of the strapping member 40 is parallel to the width direction X of the frame, and the strapping members 40 are a plurality of such strapping members spaced apart along the width direction X of the frame.

[0206] In this embodiment, the strapping member 40 is sleeved on the outer periphery of the battery cell assembly 20, thereby restricting the expansion of the battery cell 21 in the battery cell 21 assembly. On the one hand, this reduces the risk of the outer shell 214 of the battery cell 21 cracking due to excessive expansion and deformation of the battery cell 21, resulting in sealing failure of the outer shell 214 of the battery cell 21, thus improving the reliability of the battery cell 21. On the other hand, this reduces the risk of the connection between the first tabs 213B of two adjacent battery cells 21 cracking due to excessive expansion of the battery cell 21 in the height direction Z, thus improving the reliability of the energy storage device 100.

[0207] Please refer to Figure 13, which is a structural schematic diagram of the frame 10 provided in some embodiments of this application. According to some embodiments of this application, the frame 10 also includes a connector 12, and two adjacent first partitions 11 are connected by the connector 12 to form a receiving space.

[0208] Connector 12 is a structural component in frame 10 that connects two adjacent first separators 11.

[0209] For example, the connector 12 may be rod-shaped, with one end of the connector 12 connected to one of the two adjacent first partitions 11, the connector 12 extending along the height direction Z, and the other end of the connector 12 connected to the other of the two adjacent first partitions 11, so that the first partition 11 can transfer the load it carries to the first partition 11 located below it through the connector 12.

[0210] In this embodiment, two adjacent first partitions 11 are connected by a connector 12, so that the pressure applied to the first partition 11 by the battery cell assembly 20 carried by the first partition 11 can be transmitted to the first partition 11 below the first partition 11 or to the ground through the connector 12, and will not be transmitted to the battery cell assembly 20 below the first partition 11. This reduces the risk of the bottom battery cell assembly 20 malfunctioning due to excessive pressure and improves the reliability of the energy storage device 100.

[0211] Please refer to Figures 14 and 15, which are cross-sectional views of two types of connectors 12 provided in some embodiments of this application. According to some embodiments of this application, the connector 12 includes a first sub-connector 121 and a second sub-connector 122. One end of the first sub-connector 121 is connected to one of two adjacent first separators 11, and the second sub-connector 122 is connected to the other of the two adjacent first separators 11. The other end of the first sub-connector 121 is detachably connected to the other end of the second sub-connector 122.

[0212] The first sub-connector 121 and the second sub-connector 122 are the two main body parts of the connector 12. The first sub-connector 121 and the second sub-connector 122 are generally metal parts to have high strength and rigidity, thereby reducing the risk of deformation of the connector 12 when transmitting large loads.

[0213] In some embodiments, referring to FIG14, a first flange is provided at one end of the first sub-connector 121 near the second sub-connector 122, and a second flange is provided at one end of the second sub-connector 122 near the second sub-connector 122. The first flange and the second flange are connected by bolts.

[0214] In some embodiments, referring to FIG15, the second sub-connector 122 has a through hole at one end in the height direction Z near the first sub-connector 121 for the first sub-connector 121 to pass through. The second sub-connector 122 has a first mounting hole communicating with the through hole on its periphery, and the first sub-connector 121 has a second mounting hole on its periphery. The end of the first sub-connector 121 near the second sub-connector 122 is inserted into the through hole so that the first mounting hole and the second mounting hole are aligned. The connector 12 also includes a fastener 123, which passes through the first mounting hole and the second mounting hole in sequence to limit the relative movement of the first sub-connector 121 and the second sub-connector 122 in the height direction Z.

[0215] For example, one or both of the first mounting hole and the second mounting hole are threaded holes, and the fastener 123 is a bolt.

[0216] In this embodiment, the other end of the first sub-connector 121 is detachably connected to the other end of the second sub-connector 122, so that relative to the case where the frame 10 is integrally formed, this structure can disassemble the frame 10 into smaller modules, which facilitates the assembly and disassembly of the frame 10. On the one hand, it is convenient to put the battery cell assembly 20 into the accommodating space or to take out the battery cell assembly 20; on the other hand, it is convenient to reduce the space occupied by the frame 10 when not assembled, which facilitates the transportation of the frame 10.

[0217] Please refer to Figure 16, which is an exploded view of the frame 10 provided in some embodiments of this application. According to some embodiments of this application, the topmost of the plurality of first partitions 11 is a first end partition 11A, and the bottommost of the plurality of first partitions 11 is a second end partition 11B. The plurality of first partitions 11 also includes a middle partition 11C located between the first end partition 11A and the second end partition 11B. A first sub-connector 121 or a second sub-connector 122 is provided on the side of the first end partition 11A facing the second end partition 11B, and a first sub-connector 121 or a second sub-connector 122 is provided on the side of the second end partition 11B facing the first end partition 11A. The middle partition 11C has a first sub-connector 121 and / or a second sub-connector 122 on both sides in the height direction Z.

[0218] The first end separator 11A refers to the first separator 11 located at one end of the plurality of first separators 11 in the height direction Z, and the first end separator 11A is located above the other first separators 11.

[0219] The second end separator 11B refers to the first separator 11 located at another end of the plurality of first separators 11 in the height direction Z. The second end separator 11B and the first end separator 11A are arranged opposite to each other, and the second end separator 11B is located below the other first separators 11.

[0220] The middle partition 11C refers to the first partition 11 located between the first end partition 11A and the second end partition 11B in the height direction Z of the plurality of first partitions 11.

[0221] In some embodiments, a second sub-connector 122 is provided on the side of the first end partition 11A facing the second end partition 11B, a first sub-connector 121 is provided on the side of the middle partition 11C facing the first end partition 11A, a second sub-connector 122 is provided on the side of the middle partition 11C facing the second end partition 11B, and a first sub-connector 121 is provided on the side of the second end partition 11B facing the first end partition 11A.

[0222] In some embodiments, a first sub-connector 121 is provided on the side of the first end partition 11A facing the second end partition 11B, a second sub-connector 122 is provided on the side of the middle partition 11C facing the first end partition 11A, the first sub-connector 121 is provided on the side of the middle partition 11C facing the second end partition 11B, and the second sub-connector 122 is provided on the side of the second end partition 11B facing the first end partition 11A.

[0223] In this embodiment, the first end separator 11A is provided with a first sub-connector 121 or a second sub-connector 122 only on the side facing the second end separator 11B, and the second end separator 11B is provided with a first sub-connector 121 or a second sub-connector 122 only on the side facing the first end separator 11A. Therefore, compared to the case where the first sub-connector 121 or the second sub-connector 122 is provided on both sides of the first end separator 11A and the second end separator 11B, the space occupied by the first sub-connector 121 or the second sub-connector 122 in the height direction Z is reduced. This reduces the space of the frame 10 not used for assembling the battery cell assembly 20. Thus, when the volume of the frame 10 is fixed, the space of the frame 10 used for assembling the battery cell assembly 20 is increased, thereby increasing the volumetric energy density of the energy storage device 100.

[0224] Please refer to Figure 13. According to some embodiments of this application, there are multiple connectors 12, and the multiple connectors 12 are spaced apart around the first separator 11.

[0225] In this embodiment, multiple connectors 12 are spaced apart around the first separator 11 to uniformly support the first separator 11 and uniformly transfer the pressure borne by the first separator 11 to the first separator 11 located below it, thereby improving the structural stability of the frame 10 and thus improving the reliability of the energy storage device 100.

[0226] Referring to Figure 13, according to some embodiments of this application, the frame 10 has a first side 101 and a second side 102 disposed opposite to each other in the width direction X of the frame 10. A plurality of connectors 12 include a first connector 12A disposed on the first side 101 and a second connector 12B disposed on the second side 102. The width direction X of the frame is perpendicular to the height direction Z. On a projection plane perpendicular to the width direction X of the frame, the orthographic projection of the first connector 12A overlaps at least partially with the battery cell assembly 20, and the orthographic projection of the second connector 12B overlaps at least partially with the battery cell assembly 20.

[0227] The first side 101 and the second side 102 are two sides of the frame 10 that are arranged opposite each other in the width direction X of the frame. The first connector 12A is a connector 12 arranged on the first side 101, and the second connector 12B is a connector 12 arranged on the second side 102.

[0228] In some embodiments, the first connector 12A consists of a plurality of connectors spaced apart along the length Y direction of the frame; the second connector 12B consists of a plurality of connectors spaced apart along the length Y direction of the frame.

[0229] On the projection plane perpendicular to the width direction X of the frame, the orthographic projection of the first connector 12A overlaps at least partially with that of the battery cell assembly 20. That is, when viewed along the width direction X of the frame, the first connector 12A and the battery cell assembly 20 share at least a portion of the space. Thus, when the battery cell assembly 20 moves along the width direction X of the frame, the first connector 12A can restrict the battery cell assembly 20 from leaving the receiving space from the first side 101 along the width direction X of the frame.

[0230] On the projection plane perpendicular to the width direction X of the frame, the orthographic projection of the second connector 12B overlaps at least partially with the battery cell assembly 20. That is, when viewed along the width direction X of the frame, the second connector 12B and the battery cell assembly 20 share at least a portion of the space. Thus, when the battery cell assembly 20 moves along the width direction X of the frame, the second connector 12B can restrict the battery cell assembly 20 from leaving the receiving space from the second side 102 along the width direction X of the frame.

[0231] In this embodiment, on the projection plane perpendicular to the width direction X of the frame, the orthographic projection of the first connector 12A overlaps at least partially with the battery cell assembly 20, and the orthographic projection of the second connector 12B overlaps at least partially with the battery cell assembly 20. Thus, the movement of the battery cell assembly 20 in the width direction X of the frame is restricted by the first connector 12A and the second connector 12B, reducing the risk of the battery cell assembly 20 falling out of the housing space along the width direction X of the frame, thereby improving the reliability of the energy storage device 100.

[0232] Referring to Figure 17, which is a schematic diagram of another frame 10 provided in some embodiments of this application, according to some embodiments of this application, the frame 10 has a third side 103 and a fourth side 104 disposed opposite to each other in the length direction Y of the frame 10. A plurality of connectors 12 include a third connector 12C disposed on the third side 103 and a fourth connector 12D disposed on the fourth side 104. The length direction Y of the frame is perpendicular to the height direction Z. On a projection plane perpendicular to the length direction Y of the frame, the orthographic projection of the third connector 12C overlaps at least partially with the battery cell assembly 20, and the orthographic projection of the fourth connector 12D overlaps at least partially with the battery cell assembly 20.

[0233] The third side 103 and the fourth side 104 are two sides of the frame 10 that are arranged opposite each other in the length direction Y of the frame. The third connector 12C is a connector 12 arranged on the third side 103, and the fourth connector 12D is a connector 12 arranged on the fourth side 104.

[0234] In some embodiments, the third connector 12C is a plurality of connectors spaced apart along the width direction X of the frame; the fourth connector 12D is a plurality of connectors spaced apart along the width direction X of the frame.

[0235] On the projection plane perpendicular to the length direction Y of the frame, the orthographic projection of the third connector 12C overlaps at least partially with the battery cell assembly 20. That is, when viewed along the length direction Y of the frame, the third connector 12C and the battery cell assembly 20 share at least a portion of the space. Thus, when the battery cell assembly 20 moves along the length direction Y of the frame, the third connector 12C can restrict the battery cell assembly 20 from leaving the receiving space from the third side 103 along the length direction Y of the frame.

[0236] On the projection plane perpendicular to the width direction X of the frame, the orthographic projection of the fourth connector 12D overlaps at least partially with the battery cell assembly 20. That is, when viewed along the length direction Y of the frame, the fourth connector 12D and the battery cell assembly 20 share at least a portion of the space. Thus, when the battery cell assembly 20 moves along the length direction Y of the frame, the fourth connector 12D can restrict the battery cell assembly 20 from leaving the receiving space along the length direction Y of the frame from the fourth side 104.

[0237] In this embodiment, on the projection plane perpendicular to the length direction Y of the frame, the orthographic projection of the third connector 12C overlaps with at least a portion of the battery cell assembly 20, and the orthographic projection of the fourth connector 12D overlaps with at least a portion of the battery cell assembly 20. Thus, the movement of the battery cell assembly 20 in the length direction Y of the frame is restricted by the third connector 12C and the fourth connector 12D, reducing the risk of the battery cell assembly 20 falling out of the housing space along the length direction Y of the frame, thereby improving the reliability of the energy storage device 100.

[0238] Please refer to Figures 18 and 19. Figure 18 is a structural schematic diagram of an energy storage device 100 provided in some embodiments of this application (showing the energy storage housing 60 and the control compartment 70), and Figure 19 is an enlarged view of point B in Figure 3. According to some embodiments of this application, the energy storage device 100 further includes a control compartment 70. The control compartment 70 includes a compartment body, a control module (not shown in the figure), and a thermal management module (not shown in the figure). The control module (not shown in the figure) and the thermal management module (not shown in the figure) are housed in the compartment body. Both the control module (not shown in the figure) and the thermal management module (not shown in the figure) are connected to the energy storage housing 60. The control module (not shown in the figure) is used for electrical control of the battery cell 21, and the thermal management module (not shown in the figure) is used for managing the temperature of the battery cell 21.

[0239] In some embodiments, referring to FIG19, the first partition 11 is provided with a flow port 1041 communicating with the flow channel 110. One end of the connecting pipe 111 is connected to the connector, and the other end of the connecting pipe 111 is connected to the flow port 1041. It can be understood that there can be two flow ports 1041 and two connecting pipes 111. One of the two flow ports 1041 is used for the medium to flow into the flow channel 110, and the other of the two flow ports 1041 is used for the medium to flow out of the flow channel 110.

[0240] The control compartment 70 can be a separate compartment, housing both the control module (not shown in the figure) and the thermal management module (not shown in the figure). The control compartment 70 and the energy storage box 60 can be detachably connected, for example, by snap-fit ​​or bolt fastening; or they can be fixedly connected, for example, by welding; or the compartment and the energy storage box 60 can be placed separately.

[0241] In some embodiments, the control compartment 70 is mounted on one side of the energy storage box 60 along the length Y direction of the frame or the width X direction of the frame. For example, the control compartment 70 is mounted on one side of the energy storage box 60 along the length Y direction of the frame. By mounting the control compartment 70 on one side of the energy storage box 60 along the length Y direction of the frame or the width X direction of the frame, the installation or removal of the control compartment 70 is convenient.

[0242] A warehouse can also be a collection of multiple independent warehouses. For example, a warehouse may include multiple compartments, with a thermal management module (not shown in the figure) located in one compartment and a control module (not shown in the figure) located in another compartment.

[0243] In some embodiments, the control compartment 70 and the energy storage box 60 are separated. The control compartment 70 and the energy storage box 60 do not contact each other. The thermal management module and control module within the control compartment 70 are connected to the energy storage box 60 via pipes and cables. This reduces interference between the control compartment 70 and the energy storage box 60, allowing for more flexible configuration of both.

[0244] In some embodiments, the storage unit includes a first compartment and a second compartment separate from the first compartment. The thermal management module is housed in the first compartment, which is located on top of the energy storage unit. The control module includes a main control module, a power distribution module, a central control module, and a fire control module. The battery cells are electrically connected to the main control module, and the main control module is electrically connected to the central control module. The main control module, the central control module, and the fire control module are all electrically connected to the power distribution module. The main control module is located in the second compartment, and at least one of the power distribution module, the central control module, and the fire control module is located in the first compartment.

[0245] For example, the second compartment may be placed separately from the energy storage box 60; or the second compartment may be located within the receiving cavity of the energy storage box 60.

[0246] The control module (not shown in the figure) may include a main control module, a power distribution module, a central control module, and a fire control module (not shown in the figure). These modules may be located in the same compartment or in separate compartments. The main control module controls the input and output of high-voltage electrical energy to the individual battery cells within the energy storage tank 60. The central control module controls the switching actions of the main control module within the energy storage tank 60. The fire control module (not shown in the figure) controls the activation of fire-fighting components in the event of a fire due to temperature imbalance in the energy storage tank 60. These components may be fire extinguishers, etc., and can be located in the control compartment 70 or within the energy storage tank 60. The power distribution module electrically connects the main control module, central control module, and fire control module (not shown in the figure) to ensure circuit continuity and maintain their normal operation.

[0247] In this embodiment, a control module (not shown in the figure) is provided to control the electrical energy input or output of the battery cell 21, thereby achieving electrical control of the battery cell 21. A thermal management module (not shown in the figure) is also provided to manage the temperature of the battery cell 21, reducing the risk of temperature runaway. The housing can integrate the control module (not shown in the figure) and the thermal management module (not shown in the figure), which facilitates the maintenance of both modules.

[0248] Please refer to Figures 3 and 20. Figure 20 is a structural schematic diagram of the frame 10 provided in some embodiments of this application from another perspective. According to some embodiments of this application, the energy storage box 60 includes a box body 61 and a box door (not shown in the figure); the box body 61 forms an accommodating cavity with an opening inside; the box door (not shown in the figure) covers the opening, and the box body 61 has a fifth wall away from the opening along the length direction Y of the frame 10. The inner surface of the fifth wall is recessed along the length direction Y of the frame to form a recessed portion, and the length direction Y of the frame is perpendicular to the height direction Z. The frame 10 includes a frame body 14 and a guide portion 13. The frame body 14 has a third side 103 facing the fifth wall in the length direction Y of the frame 10. The guide portion 13 protrudes from the third side 103 along the length direction Y of the frame and is used to guide it to be inserted into the recessed portion along the length direction Y of the frame to limit the frame body 14 and the frame 10.

[0249] The fifth wall is the wall of the box body 61 that is away from the opening in the length direction Y of the frame, and the inner surface of the fifth wall is the surface of the fifth wall located inside the receiving cavity facing the opening.

[0250] The main body is the part of the frame 10 used to place the battery cell assembly 20. The third side 103 and the fourth side 104 are the two sides of the frame body 14 that are arranged opposite each other in the length direction Y of the frame. The third side 103 is farther away from the opening relative to the fourth side 104.

[0251] The guide portion 13 is a third side 103 that protrudes along the length Y direction of the frame.

[0252] In some embodiments, the cross-sectional area of ​​the guide portion 13 gradually decreases in the direction away from the frame body 14, so that when the frame 10 enters the receiving cavity along the length direction Y of the frame, the guide portion 13 can guide itself to be inserted into the recess, so as to guide the frame 10 to a preset installation position.

[0253] In some embodiments, the flow port 1041 is provided on the side of the first partition 11 facing the opening to facilitate the assembly and maintenance of the connecting pipe 111.

[0254] In this embodiment, the guide portion 13 is used to guide it to be inserted into the recess along the length direction Y of the frame, so as to facilitate the assembly of the frame 10 and limit the position of the frame 10.

[0255] Referring to Figures 3 and 19, according to some embodiments of this application, the energy storage housing 60 includes a plurality of second partitions 62 disposed in the receiving cavity. Both ends of the second partitions 62 in the height direction Z are connected to the housing body 61. The plurality of second partitions 62 are spaced apart along the width direction X of the frame 10 to divide the receiving cavity into a plurality of sub-receiving cavities. Each sub-receiving cavity contains the frame 10, and the height direction Z, the length direction Y of the frame, and the width direction X of the frame are perpendicular to each other.

[0256] The second partition 62 is a component in the energy storage housing 60 used to divide the receiving cavity. For example, the second partition 62 can be a plate-like structure, and the thickness direction of the second partition 62 is parallel to the width direction X of the frame.

[0257] In this embodiment, a plurality of second separators 62 are spaced apart along the width direction X of the frame to divide the receiving cavity into a plurality of sub-receiving cavities, each of which contains the frame 10, thereby reducing the risk of the first tabs 213B of the battery cells 21 of different frames 10 abutting in the width direction X of the frame, causing a short circuit inside the energy storage device 100.

[0258] Referring to Figure 19, according to some embodiments of this application, along the length direction Y of the frame, the frame 10 has a fourth side 104, which is disposed opposite to the third side 103, and the second partition 62 has a fifth side facing the opening; the energy storage device 100 also includes a fifth connector 63, one end of which is detachably connected to the fourth side 104, and the other end of which is connected to the fifth side.

[0259] The fifth side is the side of the second separator 62 facing the opening.

[0260] The fifth connector 63 is used to connect the fifth side and the fourth side 104 to restrict the movement of the frame 10 in the length direction of the frame 10. Exemplarily, the fifth connector 63 can be a metal part to give it a certain structural strength, thereby reducing the risk of the frame 10 coming out of the receiving cavity through the opening along the length direction Y of the frame.

[0261] The fifth connector 63 can be connected to the fourth side 104 and the fifth side by means of welding, snap-fitting, and riveting.

[0262] In some embodiments, one end of the fifth connector 63 is detachably connected to the fourth side 104 by bolts, and the other end of the fifth connector 63 is connected to the fifth side by bolts.

[0263] In this embodiment, one end of the fifth connector 63 is detachably connected to the fourth side 104, and the other end of the fifth connector 63 is connected to the fifth side. On the one hand, the fifth connector 63 and the fifth wall cooperate to restrict the movement of the frame 10 in the length direction Y of the frame, reduce the risk of the frame 10 coming out of the sub-accommodation cavity along the length direction Y of the frame, and improve the reliability of the energy storage device 100. On the other hand, by restricting the movement of the frame 10 in the width direction X of the frame through the fifth connector 63, the risk of the first tab 213B of the battery cell 21 abutting against the second separator 62 in the width direction X of the frame, causing a short circuit inside the energy storage device 100, is reduced.

[0264] According to some embodiments of this application, referring to Figures 3 to 20, this application provides an energy storage device 100, including a battery cell assembly 20, a frame 10, and an energy storage housing 60. The battery cell assembly 20 includes at least one battery cell 21. The frame 10 has a plurality of first partitions 11 spaced apart along the height direction Z, forming a receiving space between adjacent first partitions 11. Each receiving space accommodates a battery cell assembly 20, and the first partition 11 located at the bottom of the receiving space serves to support the battery cell assembly 20. The energy storage housing 60 has a receiving cavity, in which the frame 10 is accommodated. Each first partition 11 is a thermal management component used to regulate the temperature of the battery cell 21. The energy storage device 100 also includes a connecting pipe (not shown) and a thermal management module; one end of the connecting pipe (not shown) is connected to the first partition 11 and communicates with the flow channel 110 inside the first partition 11; the other end of the connecting pipe 111 is connected to the thermal management module 50, so that the flow channel 110 of the first partition 11 is in fluid communication with the thermal management module 50, and the thermal management module 50 is used to manage the temperature of the battery cells 21. The battery cell assembly 20 includes a plurality of battery cells 21, at least one of the battery cells 21 abuts against the first partition 11 located at the top of the housing space, and at least one of the battery cells 21 abuts against the first partition 11 located at the bottom of the housing space. The plurality of battery cells 21 in the battery cell assembly 20 are stacked along the height direction Z, and the battery cells 21 have a first wall 211 and a second wall 212 disposed opposite to each other in the height direction Z. Among the multiple battery cells 21, the topmost one is the first end battery cell 22, and the first wall 211 of the first end battery cell 22 abuts against the first partition 11 located at the top of the receiving space. Among the multiple battery cells 21, the bottommost one is the second end battery cell 23, and the second wall 212 of the second end battery cell 23 abuts against the first partition 11 located at the bottom of the receiving space. The first wall 211 and the second wall 212 are the walls with the largest area of ​​the battery cell 21. The battery cell 21 includes a housing 214 and a first electrode assembly 213, which is housed within the housing 214. The first electrode assembly 213 includes two first tabs 213B with opposite polarities. The housing 214 has a third wall 214A and a fourth wall 214B arranged opposite to each other in the width direction X of the frame 10. One end of each of the two first tabs 213B is located outside the third wall 214A and the fourth wall 214B, respectively. The width direction X of the frame is perpendicular to the height direction Z. The first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 are connected to electrically connect the first electrode assembly 213 of the two adjacent battery cells 21.The battery cell 21 also includes a second electrode assembly 215, which is housed within the housing 214. The first electrode assembly 213 and the second electrode assembly 215 are spaced apart along the length Y direction of the frame. The second electrode assembly 215 includes two second tabs 215B with opposite polarities, one end of which is respectively located outside the third wall 214A and the fourth wall 214B. The second tabs 215B of two adjacent battery cells 21 in the battery cell assembly 20 are connected to electrically connect the second electrode assemblies 215 of the two adjacent battery cells 21. The frame 10 has a first side 101 and a second side 102 arranged opposite to each other. A portion of one of the two first tabs 213B extends beyond the first side 101, and a portion of the other extends beyond the second side 102. The first tabs 213B of two adjacent battery cells 21 in the battery cell assembly 20 are welded together. The energy storage device 100 also includes a busbar 30 for electrically connecting two adjacent battery cell assemblies 20. The energy storage device 100 also includes a strapping member 40, which is fitted around the outer periphery of the battery cell assembly 20. The frame 10 also includes a connector 12, through which two adjacent first partitions 11 are connected to form a receiving space. The connector 12 includes a first sub-connector 121 and a second sub-connector 122. One end of the first sub-connector 121 is connected to one of the two adjacent first partitions 11, and the second sub-connector 122 is connected to the other of the two adjacent first partitions 11; the other end of the first sub-connector 121 and the other end of the second sub-connector 122 are detachably connected. The topmost of the plurality of first partitions 11 is a first end partition 11A, the bottommost of the plurality of first partitions 11 is a second end partition 11B, and the plurality of first partitions 11 also include a middle partition 11C located between the first end partition 11A and the second end partition 11B. A first sub-connector 121 or a second sub-connector 122 is provided on the side of the first end partition 11A facing the second end partition 11B. A first sub-connector 121 or a second sub-connector 122 is provided on the side of the second end partition 11B facing the first end partition 11A. A first sub-connector 121 and / or a second sub-connector 122 are respectively provided on both sides of the middle partition 11C in the height direction Z. Multiple connectors 12 are provided, spaced apart around the first partition 11. The frame 10 has a first side 101 and a second side 102 disposed opposite to each other in the width direction X. The multiple connectors 12 include a first connector 12A disposed on the first side 101 and a second connector 12B disposed on the second side 102. The width direction X of the frame is perpendicular to the height direction Z. On the projection plane perpendicular to the width direction X of the frame, the orthographic projection of the first connector 12A overlaps at least partially with the battery cell assembly 20, and the orthographic projection of the second connector 12B overlaps at least partially with the battery cell assembly 20.The frame 10 has a third side 103 and a fourth side 104 disposed opposite to each other in the length direction Y of the frame 10. Multiple connectors 12 include a third connector 12C disposed on the third side 103 and a fourth connector 12D disposed on the fourth side 104. The length direction Y of the frame is perpendicular to the height direction Z. On a projection plane perpendicular to the length direction Y of the frame, the orthographic projection of the third connector 12C overlaps at least partially with the battery cell assembly 20, and the orthographic projection of the fourth connector 12D overlaps at least partially with the battery cell assembly 20. The energy storage device 100 also includes a control compartment 70. The control compartment 70 includes a compartment body, a control module (not shown), and a thermal management module (not shown). The control module (not shown) and the thermal management module (not shown) are housed in the compartment body and are both connected to the energy storage enclosure 60. The control module (not shown) is used for electrical control of the battery cell 21, and the thermal management module (not shown) is used for managing the temperature of the battery cell 21. The energy storage enclosure 60 includes an enclosure body 61 and an enclosure door (not shown in the figure). The enclosure body 61 has an internal cavity with an opening. The enclosure door (not shown in the figure) covers the opening. The enclosure body 61 has a fifth wall extending away from the opening along the length Y direction of the frame 10. The inner surface of the fifth wall is recessed along the length Y direction of the frame to form a recessed portion. The length Y direction of the frame is perpendicular to the height Z direction. The frame 10 includes a frame body 14 and a guide portion 13. The frame body 14 has a third side 103 facing the fifth wall along the length Y direction of the frame 10. The guide portion 13 protrudes from the third side 103 along the length Y direction of the frame and guides it to be inserted into the recessed portion along the length Y direction of the frame to limit the frame body 14. The energy storage enclosure 60 includes a plurality of second partitions 62, which are disposed in the cavity. Both ends of the second partitions 62 in the height Z direction are connected to the enclosure body 61. Multiple second partitions 62 are spaced apart along the width direction X of the frame 10 to divide the receiving cavity into multiple sub-receiving cavities, each of which houses the frame 10. Along the length direction Y of the frame, the frame 10 has a fourth side 104, which is disposed opposite to the third side 103. The second partitions 62 have a fifth side facing the opening. The energy storage device 100 also includes a fifth connector 63, one end of which is detachably connected to the fourth side 104, and the other end of which is connected to the fifth side.

[0265] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, comprising: A battery cell assembly, including at least one battery cell; A frame having a plurality of first partitions spaced apart along its height, with a receiving space formed between two adjacent first partitions, the receiving space accommodating the battery cell assembly, and the first partition located at the bottom of the receiving space serving to support the battery cell assembly; An energy storage box having a receiving cavity, the frame being housed within the receiving cavity; In particular, in two adjacent first separators, at least one of the first separators is a thermal management component, which is used to regulate the temperature of the battery cell.

2. The energy storage device of claim 1, wherein, Each of the first separators is a thermal management component.

3. The energy storage device of claim 1 or 2, wherein, The energy storage device also includes: A connecting pipe, one end of which is connected to the first partition and communicates with the flow channel inside the first partition; A thermal management module is provided, with the other end of the connecting pipe connected to the thermal management module so that the flow channel of the first separator is in fluid communication with the thermal management module. The thermal management module is used to manage the temperature of the battery cell.

4. The energy storage device of any one of claims 1-3, wherein, The battery cell assembly includes a plurality of battery cells, at least one of the battery cells is in contact with the first separator located at the top of the receiving space, and at least one of the battery cells abuts against the first separator located at the bottom of the receiving space.

5. The energy storage device of claim 4, wherein, In the battery cell assembly, a plurality of battery cells are stacked along the height direction, and each battery cell has a first wall and a second wall that are disposed opposite to each other in the height direction; The topmost of the plurality of battery cells is the first end battery cell, and the first wall of the first end battery cell is in contact with the first partition located at the top of the receiving space; The bottommost of the plurality of battery cells is the second end battery cell, and the second wall of the second end battery cell abuts against the first partition located at the bottom of the receiving space.

6. The energy storage device of claim 5, wherein, The first wall and the second wall are the wall portions with the largest area of ​​the battery cell.

7. The energy storage device of claim 5 or 6, wherein, The battery cell includes a housing and a first electrode assembly. The first electrode assembly is housed within the housing and includes two first tabs with opposite polarities. The housing has a third wall and a fourth wall disposed opposite to each other in the width direction of the frame. One end of each of the two first tabs is disposed outside the third wall and the fourth wall, respectively. The width direction of the frame is perpendicular to the height direction. The first tabs of two adjacent battery cells in the battery cell assembly are connected to electrically connect the first electrode assembly of the two adjacent battery cells.

8. The energy storage device of claim 7, wherein, The battery cell further includes a second electrode assembly, which is housed within the housing. The first electrode assembly and the second electrode assembly are spaced apart along the length of the frame. The second electrode assembly includes two second electrodes with opposite polarities, one end of each second electrode being disposed outside the third wall and the fourth wall, respectively; The second tabs of two adjacent battery cells in the battery cell assembly are connected to electrically connect the second electrode assemblies of the two adjacent battery cells.

9. The energy storage device of claim 7 or 8, wherein, Along the width direction of the frame, the frame has a first side and a second side disposed opposite to each other, with a portion of one of the two first tabs extending beyond the first side and a portion of the other extending beyond the second side.

10. The energy storage device of any one of claims 7-9, wherein, The first tabs of two adjacent battery cells in the battery cell assembly are welded together.

11. The energy storage device of any one of claims 1-10, wherein, The accommodating space comprises multiple spaces arranged along the height direction; The frame consists of multiple frames spaced apart along its width.

12. The energy storage device of any one of claims 1-11, wherein, The energy storage device also includes a busbar for electrically connecting two adjacent battery cell assemblies.

13. The energy storage device of any one of claims 1-12, wherein, The energy storage device also includes a strapping component, which is fitted around the outer periphery of the battery cell assembly.

14. The energy storage device of any one of claims 1-13, wherein, The frame also includes a connector, through which two adjacent first partitions are connected to form the receiving space.

15. The energy storage device of claim 14, wherein, The connector includes a first sub-connector and a second sub-connector. One end of the first sub-connector is connected to one of two adjacent first separators, and the second sub-connector is connected to the other of the two adjacent first separators. The other end of the first sub-connector is detachably connected to the other end of the second sub-connector.

16. The energy storage device of claim 15, wherein, The topmost of the plurality of first separators is a first end separator, the bottommost of the plurality of first separators is a second end separator, and the plurality of first separators further includes a middle separator located between the first end separator and the second end separator; The first end partition is provided with a first sub-connector or a second sub-connector on the side facing the second end partition, the second end partition is provided with a first sub-connector or a second sub-connector on the side facing the first end partition, and the middle partition is provided with a first sub-connector and / or a second sub-connector on both sides in the height direction.

17. The energy storage device of claim 16, wherein, There are multiple connectors, and the multiple connectors are arranged at intervals around the periphery of the first separator.

18. The energy storage device of claim 17, wherein, The frame has a first side and a second side disposed opposite to each other in its width direction, and the plurality of connectors include a first connector disposed on the first side and a second connector disposed on the second side, wherein the width direction of the frame is perpendicular to the height direction; On a projection plane perpendicular to the width direction of the frame, the orthographic projection of the first connector overlaps at least partially with the battery cell assembly, and the orthographic projection of the second connector overlaps at least partially with the battery cell assembly.

19. The energy storage device of claim 17 or 18, wherein, The frame has a third side and a fourth side disposed opposite to each other in its length direction, and the plurality of connectors include a third connector disposed on the third side and a fourth connector disposed on the fourth side, and the length direction of the frame is perpendicular to the height direction; On a projection plane perpendicular to the length direction of the frame, the orthographic projection of the third connector overlaps at least partially with the battery cell assembly, and the orthographic projection of the fourth connector overlaps at least partially with the battery cell assembly.

20. The energy storage device of any one of claims 1-19, wherein, The energy storage device also includes: The control compartment includes a compartment body, a control module, and a thermal management module. The control module and the thermal management module are housed in the compartment body. The control module is used to perform electrical control on the individual battery cells, and the thermal management module is used to manage the temperature of the individual battery cells.

21. The energy storage device of claim 20, wherein, The energy storage box includes: a box body and a box door, wherein the interior of the box body forms the receiving cavity with an opening, and the box door covers the opening; The box body has a fifth wall that is away from the opening along the length direction of the frame, and the inner surface of the fifth wall is recessed along the length direction of the frame to form a recessed portion, and the length direction of the frame is perpendicular to the height direction; The frame includes a frame body and a guide portion. The frame body has a third side facing the fifth wall in the length direction of the frame. The guide portion protrudes from the third side in the length direction of the frame and is used to guide it to be inserted into the recess in the length direction of the frame to limit the position of the frame body.

22. The energy storage device of claim 21, wherein, The energy storage box includes a plurality of second partitions, which are disposed in the receiving cavity, and both ends of the second partitions in the height direction are connected to the box body; A plurality of second partitions are spaced apart along the width direction of the frame to divide the receiving cavity into a plurality of sub-receiving cavities, each of the sub-receiving cavities containing the frame, wherein the height direction, the length direction of the frame, and the width direction of the frame are perpendicular to each other.

23. The energy storage device of claim 22, wherein, Along the length of the frame, the frame body has a fourth side, which is disposed opposite to the third side, and the second partition has a fifth side facing the opening; The energy storage device further includes a fifth connector, one end of which is connected to the fourth side, and the other end of which is connected to the fifth side.

24. An energy storage system, comprising: Power conversion device; The energy storage device as described in any one of claims 1-23, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

25. A charging network, comprising: Charging stations; The energy storage device according to any one of claims 1-23, wherein the energy storage device is used to provide electrical energy to the charging pile.

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