Energy storage device, energy storage system and charging network

Abstract

The utility model discloses an energy storage device, an energy storage system and a charging network, and belongs to the technical field of batteries. The energy storage device comprises a battery monomer assembly, an energy storage box body and a frame, the battery cell assembly includes at least one battery cell. The energy storage box body is provided with a containing cavity, the frame is contained in the containing cavity, the frame is provided with a plurality of first partition pieces arranged at intervals in the height direction, a containing space is formed between every two adjacent first partition pieces, battery monomer assemblies are contained in the containing spaces, and the first partition pieces located at the bottoms of the containing spaces are used for bearing the battery monomer assemblies. Wherein in the two adjacent first separators, at least one first separator is a heat management part, and the heat management part is used for adjusting the temperature of the battery monomer. According to the technical scheme, the volume energy density of the energy storage device can be improved.

Description

Technical Field

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

[0002] With the rapid development of science and technology, electric energy has become an indispensable energy source in people's production and life. In order to improve the smoothness of electric energy supply and realize the normal operation of production and life, energy storage devices are needed. As a device for cyclically storing and releasing electric energy, the energy storage device can store electric energy in the energy storage device by charging or discharging the energy storage device, or supply the electric energy stored in the energy storage device to the power-consuming device. 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, energy storage power stations and other fields.

[0003] In the development of energy storage devices, in addition to improving the reliability of energy storage devices, how to improve the volume energy density of energy storage devices is also an issue that cannot be ignored. Therefore, how to improve the volume energy density of energy storage devices is a technical issue that needs to be continuously improved in energy storage technology. Utility Model Content

[0004] The embodiments of the present application provide an energy storage device, an energy storage system, and a charging network, which can improve the volume energy density of the energy storage device.

[0005] In a first aspect, an embodiment of the present application provides an energy storage device, comprising a battery cell assembly, a frame and an energy storage box; the battery cell assembly comprises at least one battery cell; the frame comprises a plurality of first partitions spaced apart in a height direction, a receiving space is formed between two adjacent first partitions, the receiving space receives the battery cell assembly, and the first partition located at the bottom of the receiving space is used to support the battery cell assembly; the energy storage box has a receiving cavity, the frame is received in the receiving cavity; wherein, at least one of the two adjacent first partitions is a thermal management component, and the thermal management component is used to adjust the temperature of the battery cell.

[0006] In the above technical scheme, at least one of the two adjacent first separators is a thermal management component, which is used to adjust the temperature of the battery cell. On the one hand, at least one of the two separators adjacent to the battery cell assembly can adjust the temperature of the battery cell in the battery cell assembly, thereby reducing the risk of excessive temperature of the battery cell assembly due to heat generation during discharge and charging of the battery cell, so as to improve the reliability of the energy storage device; on the other hand, the first separator is set as a thermal management component, so that there is no need to set an additional thermal management component in the accommodation space, reducing the occupation of the accommodation space by the thermal management component, so that the accommodation space can have more space for accommodating the battery cell assembly, thereby increasing the volume energy density of the energy storage device; at the same time, because the first separator is set at an interval, the accommodation space and the accommodation cavity are connected, thereby facilitating gas exchange between the accommodation space and the accommodation cavity, thereby facilitating heat exchange between the accommodation space and the accommodation cavity, thereby facilitating further reducing the risk of excessive temperature of the battery cell assembly due to heat generation during discharge and charging of the battery cell, so as to improve the reliability of the energy storage device.

[0007] In some embodiments, each of the first partitions is the thermal management component.

[0008] In the above technical solution, each first separator is a thermal management component, so that the first separator at the top of the battery cell assembly and the first separator at the bottom of the battery cell can both regulate the temperature of the battery cells in the battery cell assembly, thereby improving the temperature regulation efficiency, thereby further reducing the risk of excessive temperature of the battery cell assembly due to heat generated during the discharge and charging process of the battery cells, thereby improving the reliability of the energy storage device.

[0009] In some embodiments, the energy storage device also includes a connecting tube and a thermal management module; one end of the connecting tube is connected to the first partition and communicates with the flow channel inside the first partition; the other end of the connecting tube is connected to the thermal management module so that the flow channel of the first partition is fluidically connected to the thermal management module, and the thermal management module is used to manage the temperature of the battery cell.

[0010] In the above technical solution, the flow channel of the first separator is connected to the thermal management module fluid through the connecting pipe. By setting 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.

[0011] In some embodiments, the battery cell assembly includes a plurality of battery cells, at least one of the plurality of battery cells is in contact with the first partition located at the top of the accommodating space, and at least one of the plurality of battery cells is abutted against the first partition located at the bottom of the accommodating space.

[0012] In the above technical scheme, at least one of the multiple battery cells is in contact with the first separator located at the top of the accommodating space, thereby improving the temperature regulation ability of the first separator located at the top of the accommodating space for the battery cell abutting therewith, thereby further reducing the risk of excessive temperature of the battery cell assembly due to heat generated by the battery cell during discharge and charging; at least one of the multiple battery cells is in contact with the first separator located at the bottom of the accommodating space, thereby improving the temperature regulation ability of the first separator located at the top of the accommodating space for the battery cell abutting therewith, thereby further reducing the risk of excessive temperature of the battery cell assembly due to heat generated by the battery cell during discharge and charging, thereby improving the reliability of the energy storage device.

[0013] In some embodiments, a plurality of the battery cells are stacked along the height direction, and the battery cells have a first wall and a second wall that are oppositely arranged in the height direction; the topmost one of the plurality of the 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 accommodating space; the bottommost one of the plurality of the battery cells is a second end battery cell, and the second wall of the second end battery cell abuts the first partition located at the bottom of the accommodating space.

[0014] In the above technical solution, multiple battery cells are stacked in the height direction, and the first end battery cell contacts the first partition located at the top of the accommodating space, and the second end battery cell abuts the first partition located at the bottom of the accommodating space, so that the two adjacent first partitions respectively abut the battery cells at both ends of the battery cell assembly in the height direction. On the one hand, the first partition limits the expansion of the battery cell in the height direction, reduces the risk of rupture of the battery cell shell due to excessive expansion and deformation of the battery cell, and causes failure of the sealing of the battery cell shell, thereby improving the reliability of the battery cell; on the other hand, the two adjacent first partitions directly contact the battery cell The body assembly abuts against the body assembly to limit the position in the height direction, so that there is no need to set a structural member (such as a box body) in the accommodating space to limit the movement of the battery cell assembly, thereby reducing the occupation of the accommodating space by the limiting structural member, so that the accommodating space can have more space for accommodating the battery cell assembly, thereby increasing the volume energy density of the energy storage device; on the other hand, the two adjacent first separators can abut against the battery cell assembly, thereby improving the temperature regulation efficiency of the first separator on the battery cell in the battery cell assembly, thereby further reducing the risk of excessive temperature of the battery cell assembly due to heat generated during the discharge and charging process of the battery cell, so as to improve the reliability of the energy storage device.

[0015] In some embodiments, the first wall and the second wall are the walls of the battery cell with the largest areas.

[0016] 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 are the wall portions with the largest area, so that the expansion deformation of the battery cell in the height direction is the largest. By abutting the first wall of the battery cell at the first end with the first partition located at the top of the accommodating space, and abutting the second wall of the battery cell at the second end with the first partition located at the bottom of the accommodating space, the deformation of the battery cell in the direction of maximum deformation is better limited, and the risk of rupture of the battery cell shell due to excessive expansion and deformation of the battery cell, resulting in sealing failure of the battery cell shell, is further reduced. On the other hand, the first wall and the second wall are the largest wall portions, thereby increasing the abutment area of ​​the first end battery cell and the second end battery cell with the first separator relative to the situation where the first end battery cell and the second end battery cell use other wall portions to abut the first separator, thereby increasing the area of ​​heat exchange between the first separator and the battery cell assembly, thereby further improving the temperature regulation efficiency of the first separator on the battery cells in the battery cell assembly, thereby further reducing the risk of overheating of the battery cell assembly due to heat generation during discharge and charging of the battery cell, so as to improve the reliability of the energy storage device.

[0017] In some embodiments, the battery cell includes a shell and a first electrode assembly, the first electrode assembly is accommodated in the shell, the first electrode assembly includes two first pole ears with opposite polarities, the shell has a third wall and a fourth wall relatively arranged in the width direction of the frame, one end of the two first pole ears are respectively arranged outside the third wall and outside the fourth wall, and the width direction of the frame is perpendicular to the height direction; the first pole ears 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.

[0018] In the above technical solution, the first pole ears of two battery cells adjacent to each other in the height direction are connected to electrically connect the first electrode assemblies of two battery cells adjacent to each other in the height direction, thereby eliminating the need for additional structural members to electrically connect the first electrode assemblies of two adjacent battery cells. Compared with the case where a busbar is used to connect the first pole ears of two adjacent battery cells, on the one hand, the production cost of the energy storage device is reduced; on the other hand, the assembly of the energy storage device is facilitated, thereby improving the production efficiency of the energy storage device.

[0019] In some embodiments, the battery cell also includes a second electrode assembly, which is accommodated in the outer shell, and the first electrode assembly and the second electrode assembly are spaced apart along the length direction of the frame; the second electrode assembly includes two second pole ears with opposite polarities, and one end of the two second pole ears is respectively arranged outside the third wall and outside the fourth wall; the second pole ears 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.

[0020] In the above technical solution, the first electrode assembly and the second electrode assembly are spaced apart along the length direction of the frame, thereby rationally utilizing the space of the accommodation space in the length direction of the frame; by connecting the second pole ears of two battery cells adjacent to each other in the height direction to electrically connect the second electrode assemblies of two battery cells adjacent to each other in the height direction, no additional structural parts are required to electrically connect the second electrode assemblies of two adjacent battery cells, thereby, compared with the case where a busbar is used to connect the second pole ears of two adjacent battery cells, on the one hand, the production cost of the energy storage device is reduced; on the other hand, the assembly of the energy storage device is facilitated, thereby improving the production efficiency of the energy storage device.

[0021] In some embodiments, along a width direction of the frame, the frame has a first side and a second side that are oppositely disposed, a portion of one of the two first electrode tabs extends beyond the first side, and a portion of the other one extends beyond the second side.

[0022] In the above technical solution, a portion of one of the two first pole ears extends beyond the first side, and a portion of the other pole ear extends beyond the second side, thereby reducing the space occupied by the first pole ear within the accommodation space when the length of the first pole ear is constant, so that the accommodation space can have more space for accommodating the first electrode assembly of the battery cell, thereby increasing the volume energy density of the energy storage device.

[0023] In some embodiments, the first tabs of two adjacent battery cells in the battery cell assembly are welded.

[0024] In the above technical solution, the first pole ears of two adjacent battery cells are connected by welding, which can effectively improve the connection firmness and reliability between the first pole ears of the two battery cells, and is conducive to reducing the risk of the first pole ears of the two battery cells falling off from each other during use, so as to improve the reliability of the energy storage device.

[0025] In some embodiments, the accommodating spaces are multiple and arranged along the height direction; and the frames are multiple and spaced apart along the width direction thereof.

[0026] In the above technical solution, there are multiple accommodating spaces arranged in the height direction, so that when the size of the accommodating space in the height direction of the frame is constant, compared with the case where each frame has only one accommodating space, the space of the frame in the height direction is more reasonably used, so that the frame can accommodate more battery cell assemblies, and then more battery cells, thereby increasing the energy density of the energy storage device. There are multiple frames arranged at intervals along the width direction, so that when the size of the energy storage box in the width direction of the frame is constant, compared with the case where each energy storage box only accommodates one frame, the space of the energy storage box in the width direction of the frame is more reasonably used, so that the energy storage box can accommodate more battery cell assemblies, and then more battery cells, thereby increasing the energy density of the energy storage device.

[0027] In some embodiments, the energy storage device further includes a busbar, which is used to electrically connect two adjacent battery cell assemblies.

[0028] In the above technical solution, two adjacent battery cell assemblies are connected by a busbar, thereby facilitating the output of currents of multiple battery cell assemblies.

[0029] In some embodiments, the energy storage device further includes a bundling member, and the bundling member is sleeved on the outer circumference of the battery cell assembly.

[0030] In the above technical solution, the bundling piece is sleeved on the periphery of the battery cell assembly, so as to limit the expansion of the battery cells in the battery cell assembly through the bundling piece. On the one hand, the risk of the battery cell shell rupture caused by excessive expansion and deformation of the battery cell, resulting in failure of the sealing of the battery cell shell, is reduced, thereby improving the reliability of the battery cell; on the other hand, the risk of the connection between the first pole ears of two adjacent battery cells being subjected to stress and cracking due to excessive expansion of the battery cell in the height direction is reduced, thereby improving the reliability of the energy storage device.

[0031] In some embodiments, the frame further includes a connecting piece, and two adjacent first partitions are connected by the connecting piece to form the accommodating space.

[0032] In the above technical solution, two adjacent first separators are connected by a connecting piece, 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 connecting piece, and will not be transmitted to the battery cell assembly below the first separator, thereby reducing the risk of abnormal use of the battery cell assembly at the bottom due to excessive pressure, thereby improving the reliability of the energy storage device.

[0033] In some embodiments, 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 partitions, and the second sub-connector is connected to the other of the two adjacent first partitions; the other end of the first sub-connector is detachably connected to the other end of the second sub-connector.

[0034] 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, so that compared with the case where the frame is integrally formed, this structure can disassemble the frame into smaller modules, which is convenient for assembling and disassembling the frame. On the one hand, it is convenient to place the battery cell assembly into the accommodating space or remove the battery cell assembly; on the other hand, it is convenient to reduce the space occupied by the frame when it is not assembled, which is convenient for transporting the frame.

[0035] In some embodiments, the one located at the top of the multiple first partitions is a first end partition, and the one located at the bottom of the multiple first partitions is a second end partition, and the multiple first partitions also include a middle partition located between the first end partition and the second end partition; the first end partition is provided with the first sub-connector or the second sub-connector on the side facing the second end partition, and the second end partition is provided with the first sub-connector or the second sub-connector on the side facing the first end partition, and the first sub-connector and / or the second sub-connector are respectively provided on both sides of the middle partition in the height direction.

[0036] In the above technical solution, the first end separator is provided with the first sub-connector or the second sub-connector only on the side facing the second end separator, and the second end separator is provided with the first sub-connector or the second sub-connector only on the side facing the first end separator. Therefore, compared with the situation where the first sub-connector or the second sub-connector is provided on both sides of the first end separator and the second end separator, the space occupied by the first sub-connector or the second sub-connector in the height direction is reduced, thereby reducing the space of the frame not used for assembling battery cell assemblies, so that when the volume of the frame is constant, the space of the frame for assembling battery cell assemblies is increased, thereby increasing the volume energy density of the energy storage device.

[0037] In some embodiments, there are a plurality of the connecting members, and the plurality of the connecting members are spaced apart around a circumference of the first partition.

[0038] In the above technical solution, multiple connecting members are arranged at intervals around the circumference of the first partition to evenly support the first partition and evenly transfer the pressure borne by the first partition to the first partition located below the first partition, thereby improving the structural stability of the frame and further improving the reliability of the energy storage device.

[0039] In some embodiments, the frame has a first side and a second side that are relatively arranged in the width direction of the frame, the multiple connecting members include a first connecting member arranged on the first side and a second connecting member arranged on the second side, and the width direction of the frame is perpendicular to the height direction; on the projection plane perpendicular to the width direction of the frame, the orthographic projection of the first connecting member overlaps with at least part of the battery cell assembly, and the orthographic projection of the second connecting member overlaps with at least part of the battery cell assembly.

[0040] In the above technical solution, on the projection plane perpendicular to the width direction of the frame, the orthographic projection of the first connecting member overlaps with at least part of the battery cell assembly, and the orthographic projection of the second connecting member overlaps with at least part of the battery cell assembly, thereby limiting the movement of the battery cell assembly in the width direction of the frame by the first connecting member and the second connecting member, reducing the risk of the battery cell assembly escaping from the accommodation space along the width direction of the frame, thereby improving the reliability of the energy storage device.

[0041] In some embodiments, the frame has a third side and a fourth side relatively arranged in the length direction of the frame, the multiple connectors include a third connector arranged on the third side and a fourth connector arranged on the fourth side, and the length direction of the frame is perpendicular to the height direction; on the projection plane perpendicular to the length direction of the frame, the orthographic projection of the third connector overlaps with at least part of the battery cell assembly, and the orthographic projection of the fourth connector overlaps with at least part of the battery cell assembly.

[0042] In the above technical solution, on the projection plane perpendicular to the length direction of the frame, the orthographic projection of the third connecting member at least partially overlaps with the battery cell assembly, and the orthographic projection of the fourth connecting member at least partially overlaps with the battery cell assembly, thereby limiting the movement of the battery cell assembly in the length direction of the frame by the third connecting member and the fourth connecting member, reducing the risk of the battery cell assembly escaping from the accommodation space along the length direction of the frame, thereby improving the reliability of the energy storage device.

[0043] In some embodiments, the energy storage device also includes a control compartment, including 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 electrically control the battery cells, and the thermal management module is used to manage the temperature of the battery cells.

[0044] In the above technical solution, by setting up a control module, the control module can control the input or output of electric energy of the battery cell to realize electrical control of the battery cell; by setting up a thermal management module, the thermal management module can manage the temperature of the battery cell to reduce the risk of temperature runaway of the battery cell. The warehouse can integrate the control module and the thermal management module, which is conducive to the maintenance of the control module and the thermal management module.

[0045] In some embodiments, the energy storage box includes a box body and a box door, the interior of the box body forms the accommodating cavity with an opening, and the box door covers the opening; the box body has a fifth wall 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, and the guide portion protrudes from the third side along the length direction of the frame, and the guide portion is used to guide it to be inserted into the recessed portion along the length direction of the frame to limit the frame body.

[0046] In the above technical solution, the guide part is used to guide it to be inserted into the recessed part along the length direction of the frame, so as to facilitate the assembly of the frame and limit the position of the frame.

[0047] In some embodiments, the energy storage box includes a plurality of second partitions, which are arranged in the accommodating cavity, and both ends of the second partitions in the height direction are connected to the box body; the plurality of second partitions are arranged at intervals along the width direction of the frame to divide the accommodating cavity into a plurality of sub-accommodating cavities, each of the sub-accommodating cavities accommodating the frame, and the height direction, the length direction of the frame and the width direction of the frame are perpendicular to each other.

[0048] In the above technical solution, a plurality of second separators are arranged at intervals along the width direction of the frame to divide the accommodating cavity into a plurality of sub-accommodating cavities, each of which accommodates a frame, thereby reducing the risk of the first pole ears of battery cells of different frames abutting against each other in the width direction of the frame, causing internal short circuit of the energy storage device.

[0049] In some embodiments, along the length direction of the frame, the frame body has a fourth side, the fourth side is arranged opposite to the third side, and the second partition has a fifth side facing the opening; the energy storage device also includes a fifth connecting member, one end of the fifth connecting member is connected to the fourth side, and the other end of the fifth connecting member is connected to the fifth side.

[0050] In the above technical solution, one end of the fifth connecting member is connected to the fourth side, and the other end of the fifth connecting member is connected to the fifth side. On the one hand, the fifth connecting member and the fifth wall cooperate to limit the movement of the frame in the length direction of the frame, thereby reducing the risk of the frame escaping from the sub-containing cavity along the length direction of the frame and improving the reliability of the energy storage device. On the other hand, the movement of the frame in the width direction of the frame is limited by the fifth connecting member, thereby reducing the risk of the first pole ear of the battery cell abutting against the second separator in the width direction of the frame, resulting in an internal short circuit in the energy storage device.

[0051] In a second aspect, an embodiment of the present application provides an energy storage system, comprising a power conversion device, and the energy storage device provided by any embodiment of the first aspect, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0052] In a third aspect, an embodiment of the present application provides a charging network, including a charging pile, and an energy storage device provided by any embodiment 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 electrical energy to the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 A schematic diagram of the structure of a charging network provided in some embodiments of the present application;

[0055] Figure 2 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0056] Figure 3 A schematic diagram of the structure of an energy storage device provided for some embodiments of the present application (showing an energy storage box and a frame);

[0057] Figure 4 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application (showing a frame and a battery cell assembly);

[0058] Figure 5 A cross-sectional view of a first partition provided for some embodiments of the present application;

[0059] Figure 6 A cross-sectional view of another first partition provided for some embodiments of the present application;

[0060] Figure 7A schematic structural diagram of another energy storage device provided for some embodiments of the present application (showing a frame and a battery cell assembly);

[0061] Figure 8 A schematic structural diagram of another energy storage device provided for some embodiments of the present application (showing a frame and a battery cell assembly);

[0062] Fig. 9 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0063] Fig.10 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0064] Fig.11 for Figure 4 Sectional view of AA in the middle;

[0065] Fig.12 A schematic diagram of the structure of a battery cell assembly provided in some embodiments of the present application;

[0066] Fig.13 A schematic diagram of the structure of a framework provided for some embodiments of the present application;

[0067] Fig.14 A cross-sectional view of a connector provided in some embodiments of the present application;

[0068] Fig.15 A cross-sectional view of another connecting member provided for some embodiments of the present application;

[0069] Fig.16 An exploded view of the structure of a framework provided for some embodiments of the present application;

[0070] Fig.17 A schematic diagram of another structure of a framework provided for some embodiments of the present application;

[0071] Fig.18 A schematic diagram of the structure of an energy storage device provided for some embodiments of the present application (showing an energy storage box and a control compartment);

[0072] Fig.19 for Figure 3 The enlarged view of point B in the middle;

[0073] Fig. 20 A schematic structural diagram of a framework provided in some embodiments of the application from another perspective.

[0074] Icon: 1000-charging network; 2000-energy storage system; 3000-power generation device; 100-energy storage device; 200-charging pile; 300-power conversion device;

[0075] 10-frame; 101-first side; 102-second side; 103-third side; 104-fourth side; 1041-flow channel opening; 11-first partition; 110-flow channel; 111-connecting pipe; 11A-first end partition; 11B-second end partition; 11C-middle partition;

[0076] 12-connecting member; 12A-first connecting member; 12B-second connecting member; 12C-third connecting member; 12D-fourth connecting member; 121-first sub-connecting member; 122-second sub-connecting member; 123-fastening member; 13-guide portion; 14-frame body;

[0077] 20-battery cell assembly; 21-battery cell; 211-first wall; 212-second wall; 213-first electrode assembly; 213A-first body; 213B-first pole ear; 214-housing; 214A-third wall; 214B-fourth wall; 215-second electrode assembly; 215A-second body; 215B-second pole ear; 22-first end battery cell; 23-second end battery cell;

[0078] 30- busbar; 40- bundling piece; 50- thermal management module; 60- energy storage box; 61- box body; 62- second partition; 63- fifth connecting piece; 70- control compartment;

[0079] X-width direction of the frame; Y-length direction of the frame; Z-height direction. DETAILED DESCRIPTION

[0080] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0081] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0082] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0083] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0084] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0085] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0086] The term “plurality” used in this application refers to two or more (including two).

[0087] In the present 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 the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

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

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

[0090] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0091] Optionally, the electrode assembly is a winding structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a winding structure.

[0092] Optionally, the electrode assembly is a laminate structure.

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

[0094] In order to improve the working reliability and stability of the energy storage device, a thermal management component is usually provided in the assembly scheme of the energy storage device. The thermal management component is used to contain a fluid to adjust the temperature of the battery cells in the energy storage device. At present, the thermal management component is contained together with the battery cells in the containing space formed by the first partition on the frame, thereby occupying part of the containing space, reducing the volume of the containing space that can be used by the battery cells, and further reducing the number of battery cells that can be contained in the containing space, thereby reducing the volume energy density of the energy storage device.

[0095] Based on the above considerations, in order to improve the volume energy density of the energy storage device, the embodiment of the present application proposes an energy storage device, including a battery cell assembly, a frame and an energy storage box; the battery cell assembly includes at least one battery cell; the frame has a plurality of first partitions arranged at intervals along the height direction, and a storage space is formed between two adjacent first partitions, each storage space contains a battery cell assembly, and the first partition located at the bottom of the storage space is used to carry the battery cell assembly; the energy storage box has a storage cavity, and the frame is accommodated in the storage cavity. Among them, at least one of the two adjacent first partitions is a thermal management component, and the thermal management component is used to adjust the temperature of the battery cell.

[0096] In an energy storage device of this structure, at least one of the two adjacent first separators is a thermal management component, which is used to adjust the temperature of the battery cells. On the one hand, at least one of the two separators adjacent to the battery cell assembly can adjust the temperature of the battery cells in the battery cell assembly, thereby reducing the risk of excessive temperature of the battery cell assembly due to heat generated during discharge and charging of the battery cells, so as to improve the reliability of the energy storage device. On the other hand, the first separator is set as a thermal management component, so that there is no need to set an additional thermal management component in the accommodation space, which reduces the occupation of the accommodation space by the thermal management component, so that the accommodation space can have more space for accommodating the battery cell assembly, thereby increasing the volume energy density of the energy storage device.

[0097] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage power station can store electric energy during low electricity consumption, and provide electric energy to relevant users or electrical equipment during peak electricity consumption. The wind energy collected by the wind turbine of the wind power generation system is converted into electric energy and stored by the energy storage device. The solar power generation system can convert solar energy into electric energy, store it by the energy storage device, and supply it to users in a timely manner. The mobile power system can supply power to relevant electrical equipment in places that the power grid power supply system cannot reach, such as remote mountainous areas, remote wilderness and other areas. The temporary power supply system can supply power to users when the power supply is insufficient. The energy storage system provided in the embodiment of the present application can be any power system that requires an energy storage device.

[0098] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a charging network 1000 provided in some embodiments of the present application. The present application embodiment provides a charging network 1000, the charging network 1000 includes a charging pile 200, and the charging pile 200 is used to charge electrical equipment. The charging network 1000 may also include an energy storage device 100, the energy storage device 100 is electrically connected to the charging pile 200, and the energy storage device 100 is used to provide electrical energy to the charging pile 200.

[0099] It should be noted that the charging pile 200 is electrically connected to the battery cells in the energy storage device 100 through a cable, and the battery cells can provide the electric energy stored in themselves to the charging pile 200. The charging pile 200 has a connector, which can be connected to an electric device, so that the electric device can be replenished. The application of the energy storage device 100 in the charging network 1000 can effectively improve the safety of the charging network 1000 and also help improve the flexibility of the charging network 1000 in deployment.

[0100] In a charging network 1000 , there may be one charging pile 200 , and the energy storage device 100 provides power to the one charging pile 200 ; there may 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 includes battery cells, and the battery cells are electrically connected to the charging pile 200 so that the battery provides electrical energy to the charging pile 200.

[0102] As an example, Figure 1 As shown, the charging network 1000 includes an energy storage device 100 and two charging posts 200 , and one energy storage device 100 provides electrical energy for the two charging posts 200 .

[0103] Please refer to Figure 2 , Figure 2 A schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of the present application. An embodiment of the present 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 electric 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, and the power conversion device 300 converts the electric energy provided by the power generation device 3000 into the energy storage device 100 for storage.

[0104] The power conversion device is used to connect between the power generation device 3000 and the energy storage device 100. The power generation device 3000 is used to generate electric energy, and the power generation device 3000 is used to store the electric energy generated by it in the energy storage device 100 through the power conversion device. The energy storage system 2000 uses the energy storage device 100, which can effectively improve the operational safety of the energy storage system 2000. In specific implementation, the power generation equipment can specifically be a solar panel, a hydropower generation equipment, a thermal power generation equipment, etc. Among them, the specific type of the power generation equipment is not limited in this application.

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

[0106] Please refer to Figure 3 and Figure 4 , and please refer to Figure 5 and Figure 6 , Figure 3 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application (showing an energy storage box and a frame), Figure 4A schematic diagram of the structure of an energy storage device 100 provided in some embodiments of the present application is an energy storage device 100 (showing a frame 10 and a battery cell assembly 20), Figure 5 and Figure 6 Cross-sectional views of two types of first separators 11 provided for some embodiments of the present application. The embodiments of the present application provide an energy storage device 100, comprising a battery cell assembly 20, a frame 10 and an energy storage box 60. The battery cell assembly 20 comprises at least one battery cell 21. The frame 10 has a plurality of first separators 11 spaced apart in the height direction Z, and a receiving space is formed between two adjacent first separators 11, each receiving space receiving a battery cell assembly 20, and the first separator 11 located at the bottom of the receiving space is used to carry the battery cell assembly 20. The energy storage box 60 has a receiving cavity, and the frame 10 is received in the receiving cavity. Among them, at least one of the two adjacent first separators 11 is a thermal management component, and the thermal management component is used to adjust 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. The multiple battery cells 21 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that the multiple battery cells 21 are both connected in series and in parallel. The multiple battery cells 21 may be directly connected in series, in parallel, or in a hybrid connection to form a battery cell assembly 20; or, the multiple battery cells 21 may be first connected in series, in parallel, or in a hybrid connection to form a battery module, and the multiple battery modules may then be connected in series, in parallel, or in a hybrid connection to form a battery cell assembly 20.

[0108] The battery cell 21 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0109] The 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 charge and discharge process of the battery cell 21, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, 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.

[0111] As an example, the battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cells include but are not limited to square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. The polygonal prismatic batteries are, for example, hexagonal prismatic batteries.

[0112] The frame 10 is a structural component for placing the battery cell assembly 20. For example, the frame 10 can be used to place one or more battery cell assemblies 20, and each battery cell assembly 20 can be detachably connected to the frame 10.

[0113] The energy storage box 60 is a component for providing a stable working environment for the battery cells. Exemplarily, the energy storage box 60 may be a container.

[0114] It can be understood that, since the energy storage box 60 is provided, there is no need to set additional covering members between adjacent pairs of first partitions 11 to cover the accommodating space, thereby reducing the number of parts of the energy storage device 100 and reducing the production cost of the energy storage device 100. At the same time, the accommodating space and the accommodating cavity are connected to facilitate gas exchange between the accommodating space and the accommodating cavity, thereby facilitating heat exchange between the accommodating space and the accommodating cavity, thereby facilitating further reducing the risk of excessive temperature of the battery cell assembly 20 due to heat generated during the discharge and charging process of the battery cell 21, so as to improve the reliability of the energy storage device 100.

[0115] In some embodiments, reference Figure 3 The energy storage box 60 is a rectangular parallelepiped 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 is a plurality of frames 10 spaced apart in the accommodating cavity along the width direction X of the frame 10.

[0116] The first separator 11 is a structural member in the frame 10 for separating two adjacent battery cell assemblies 20 in the height direction Z or for separating the outside world and the battery cell assembly 20 in the height direction Z. The first separator 11 is generally a metal member 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, reference Figure 5 and Figure 6 The first partition 11 may be plate-shaped, and the length direction Y of the frame and the width direction X of the frame are both perpendicular to the height direction Z, so that an accommodation space is formed between two adjacent first partitions 11 .

[0118] The first partition 11 located at the bottom of the accommodating space is used to support the battery cell assembly 20, which means that the battery cell assembly 20 located in the accommodating space is directly abutted against the first partition 11 in the height direction Z, or abutted through an insulating member, so that the gravity of the battery cell assembly 20 directly acts on the first partition 11 located at the bottom of the accommodating space, that is, the first partition 11 located at the bottom of the accommodating space provides supporting force to the battery cell 21 to limit 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, reference Figure 4 and Figure 5 The thermal management component has a flow channel 110 inside, and the flow channel 110 is used to accommodate a medium to adjust the temperature of the battery cell 21.

[0121] In some embodiments, the thermal management component may adjust the temperature of the battery cell 21 by using the accommodation medium to exchange heat with the battery cell 21 .

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

[0123] Adjusting the temperature means heating or cooling the battery cell 21. Exemplarily, when the battery cell 21 is cooled or lowered in temperature, the thermal management component is used to contain a cooling fluid or a solid-liquid phase change material to lower the temperature of the battery cell 21. At this time, the thermal management component may also be referred to as a cooling component, a cooling system, or a cooling plate, etc., and the fluid contained therein may also be referred to as a cooling medium or a cooling fluid, and more specifically, may be referred to as a coolant or a cooling gas.

[0124] In addition, the thermal management component can also be used to heat the battery cell 21, which is not limited in the present application. Optionally, the fluid can be circulated to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air.

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

[0126] The flow channel 110 refers to a part that can accommodate a medium 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 through a connector, and the medium storage device (such as a water tank) in the energy storage device 100 provides the medium to the thermal management component and realizes the circulation of the medium 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, and 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 may be a water cooling plate, which can cool the battery cells 21 by passing water with a relatively low temperature, and can heat the battery cells 21 by passing water with a relatively high temperature.

[0128] In some embodiments, the water cooling plate may be formed by stacking two plate-like members, and surfaces of the plate-like members facing each other may form a groove, and the two plate-like members are stacked so that the groove forms a flow channel 110 allowing the medium to flow.

[0129] In some embodiments, the thermal management component may be a rolled piece.

[0130] In some embodiments, please refer to Figure 5 The flow channel 110 inside the thermal management component is in a harmonica shape, so that the contact area between the medium and the battery cell 21 is larger.

[0131] In some embodiments, please refer to Figure 6 The flow channel 110 inside the thermal management component can be arranged in a circuitous 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 is provided with the above-mentioned 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] Among two adjacent first partitions 11, at least one first partition 11 is a thermal management component, which can be understood as one of the two adjacent first partitions 11 in the height direction Z is a thermal management component, and the other may or may not be a thermal management component.

[0134] In this embodiment, at least one of the two adjacent first separators 11 is a thermal management component, which is used to adjust the temperature of the battery cell 21. On the one hand, at least one of the two separators adjacent to the battery cell assembly 20 can adjust the temperature of the battery cell 21 in the battery cell assembly 20, thereby reducing the risk of excessive temperature of the battery cell assembly 20 due to heat generated by the battery cell 21 during discharge and charging, so as to improve the reliability of the energy storage device 100. On the other hand, the first separator 11 is set as a thermal management component, so that there is no need to set an additional thermal management component in the accommodation space, which reduces the occupation of the accommodation space by the thermal management component, so that the accommodation space can have more space for accommodating the battery cell assembly 20, thereby increasing the volume energy density of the energy storage device 100. At the same time, since the first partition 11 is arranged at intervals, the accommodating space and the accommodating cavity are connected, which facilitates gas exchange between the accommodating space and the accommodating cavity, thereby facilitating heat exchange between the accommodating space and the accommodating cavity, and further facilitating further reducing the risk of overheating of the battery cell assembly 20 due to heat generated during discharge and charging of the battery cell 21, so as to improve the reliability of the energy storage device 100.

[0135] According to some embodiments of the present application, each first partition 11 is a heat management component.

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

[0137] In the present embodiment, the first separators 11 are all thermal management components, so that the first separators 11 at the top of the battery cell assembly 20 and the first separators 11 at the bottom of the battery cells 21 can both regulate the temperature of the battery cells 21 in the battery cell assembly 20, thereby improving the temperature regulation efficiency, thereby further reducing the risk of overheating of the battery cell assembly 20 due to heat generated by the battery cells 21 during discharge and charging, thereby improving the reliability of the energy storage device 100.

[0138] Please refer to Figure 3 According to some embodiments of the present application, the energy storage device 100 further includes a connecting tube (not shown in the figure) and a thermal management module; one end of the connecting tube (not shown in the figure) 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 tube 111 is connected to the thermal management module 50 so that the flow channel 110 of the first partition 11 is fluidically connected to 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 partition 11 is connected to the fluid of the thermal management module 50 through a connecting tube (not shown in the figure). By setting up 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 please refer to Figure 7 and Figure 8 , Figure 7 and Figure 8 Schematic diagram of the structure of two other energy storage devices 100 provided for some embodiments of the present application (showing the frame 10 and the battery cell assembly 20). According to some embodiments of the present application, the battery cell assembly 20 includes a plurality of battery cells 21, at least one of the plurality of battery cells 21 is in contact with the first partition 11 located at the top of the accommodation space, and at least one of the plurality of battery cells 21 is in contact with the first partition 11 located at the bottom of the accommodation space.

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

[0142] In some embodiments, reference Figure 4 The battery cell assembly 20 includes a plurality of battery cells 21 , and the battery cells 21 are stacked along a height direction Z.

[0143] In some embodiments, reference Figure 7 The battery cell assembly 20 includes a plurality of battery cells 21 , and the battery cells 21 are stacked along the length direction Y of the frame.

[0144] In some embodiments, reference Figure 8 The battery cell assembly 20 includes a plurality of battery cells 21 , and the battery cells 21 are stacked along a width direction X of the frame.

[0145] At least one battery cell 21 is in contact with the first separator 11 located at the top of the accommodating space, which can be understood as at least one battery cell 21 is in contact with the first separator 11 located at the top of the accommodating space to provide extrusion pressure to each other; it can also be understood that at least one battery cell 21 is in contact with the first separator 11 located at the top of the accommodating space and does not provide extrusion pressure to each other.

[0146] Exemplarily, the battery cell 21 and the first separator 11 located at the top of the accommodating space can be directly abutted, or can be indirectly abutted through structural parts such as insulating parts, that is, the battery cell 21 and the first separator 11 located at the top of the accommodating space provide extrusion pressure to each other; the battery cell 21 and the first separator 11 located at the top of the accommodating space can be directly in contact, or can be indirectly in contact through structural parts such as insulating parts, that is, the battery cell 21 and the first separator 11 located at the top of the accommodating space do not provide extrusion pressure to each other.

[0147] For example, the battery cell 21 may directly abut against the first separator 11 located at the bottom of the accommodation space, or may abut against the first separator 11 through an insulating member.

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

[0149] In an embodiment where all the first separators 11 are thermal management components, at least one battery cell 21 among the multiple battery cells 21 abuts against one of the first separators 11 to improve the temperature regulation efficiency of the first separator 11 on the battery cell 21, and at least one battery cell 21 among the multiple battery cells 21 abuts against another first separator 11 to improve the temperature regulation efficiency of the other first separator 11 on the battery cell 21. In particular, when all the battery cells 21 in a battery cell assembly 20 abut against two adjacent first separators 11, the two adjacent first separators 11 have the highest temperature regulation efficiency for the battery cells 21 in the battery cell assembly 20.

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

[0151] Please refer to Figure 4 , and please refer to Fig. 9 , Fig. 9 A schematic diagram of the structure of a battery cell 21 provided for some embodiments of the present application. According to some embodiments of the present application, a plurality of battery cells 21 in a battery cell assembly 20 are stacked along the height direction Z, and the battery cell 21 has a first wall 211 and a second wall 212 arranged opposite to each other in the height direction Z. The topmost one of the plurality of battery cells 21 is a first end battery cell 22, and the first wall 211 of the first end battery cell 22 contacts the first partition 11 located at the top of the accommodation space. The bottommost one of the plurality of 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 accommodation 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 disposed 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 the 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 accommodation space than other battery cells 21 .

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

[0155] It can be understood that the first wall 211 of the first end battery cell 22 abuts against the first partition 11 located at the top of the accommodating space. On the one hand, the first partition 11 located at the top of the accommodating space can provide support force to the first wall 211 of the first end battery cell 22, so that the first end battery cell 22 expands in the height direction Z, or, when the remaining battery cells 21 in the battery cell assembly 20 expand in the height direction Z and cause the first wall 211 of the first end battery cell 22 to have a tendency to move along the height direction Z, the first partition 11 located at the top of the accommodating space can limit the movement of the first wall 211 of the first end battery cell 22 in the height direction Z, thereby limiting the expansion of the battery cells 21 in the battery cell assembly 20 in the height direction Z; on the other hand, the first partition 11 located at the top of the accommodating space is in 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 accommodating space on 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 accommodating space. On the one hand, the first partition 11 located at the bottom of the accommodating space can provide support force to the second wall 212 of the second end battery cell 23, so that the second end battery cell 23 expands in the height direction Z, or, when the remaining battery cells 21 in the battery cell assembly 20 expand in the height direction Z and cause the second wall 212 of the second end battery cell 23 to have a tendency to move along the height direction Z, the first partition 11 located at the bottom of the accommodating space can limit the movement of the second wall 212 of the second end battery cell 23 in the height direction Z, thereby limiting the expansion of the battery cells 21 in the battery cell assembly 20 in the height direction Z; on the other hand, the first partition 11 located at the bottom of the accommodating space is in surface contact with the second end battery cell 23, thereby improving the temperature regulation efficiency of the first partition 11 located at the bottom of the accommodating space on the second end battery cell 23.

[0157] In summary, the two adjacent first separators 11 can function as end plates and boxes to limit the expansion of the battery cell assembly 20 , thereby eliminating the need to provide structural components such as end plates and boxes in the accommodation space, thereby facilitating 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 accommodating space can be understood as 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 accommodating space to provide extrusion pressure to each other; it can also be understood as 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 accommodating space and no extrusion pressure is provided to each other.

[0159] Exemplarily, the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the accommodating space can be directly abutted, or can be indirectly abutted through structural parts such as insulating parts, that is, the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the accommodating space provide extrusion pressure to each other; the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the accommodating space can be directly in contact, or can be indirectly in contact through structural parts such as insulating parts, that is, the first wall 211 of the first end battery cell 22 and the first partition 11 located at the top of the accommodating space do not provide extrusion pressure to each other.

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

[0161] In some embodiments, the adjacent battery cells 21 of the plurality of battery cells 21 abut against each other. On the one hand, 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 sequentially transmitted to the adjacent battery cells 21 through the first end battery cell 22 and the second end battery cell 23, thereby facilitating the restriction of 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; on the other hand, the first separator 11 is conveniently connected to the battery cell 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 realizing the temperature regulation of the battery cell 21 in the battery cell assembly 20, facilitating the reduction of the temperature 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 improving the reliability of the energy storage device 100.

[0162] Illustratively, adjacent battery cells 21 among the plurality of battery cells 21 may be directly abutted against each other or may be abutted against each other through an insulating member.

[0163] In the present embodiment, a plurality of battery cells 21 are stacked in the height direction Z, and the first end battery cell 22 abuts against the first partition 11 located at the top of the accommodating space, and the second end battery cell 23 abuts against the first partition 11 located at the bottom of the accommodating space, so that the two adjacent first partitions 11 respectively abut against the battery cells 21 at both ends of the battery cell assembly 20 in the height direction Z. On the one hand, the first partition 11 limits the expansion of the battery cell 21 in the height direction Z, thereby reducing the risk of rupture of the outer shell 214 of the battery cell 21 due to excessive expansion and deformation of the battery cell 21, thereby reducing the risk of sealing failure of the outer shell 214 of the battery cell 21, thereby improving the reliability of the battery cell 21. On the other hand, the two adjacent first partitions 11 directly It is in contact with the battery cell assembly 20 to limit the position in the height direction Z, so that there is no need to set a structure (such as a box) in the accommodation space to limit the movement of the battery cell assembly 20, thereby reducing the occupation of the accommodation space by the structure for limiting the position, so that the accommodation space can have more space for accommodating the battery cell assembly 20, thereby increasing the volume energy density of the energy storage device 100; on the other hand, the two adjacent first separators 11 can both abut against the battery cell assembly 20, thereby improving the temperature regulation efficiency of the first separator 11 on the battery cell 21 in the battery cell assembly 20, thereby further reducing the risk of excessive temperature of the battery cell assembly 20 due to heat generated by the battery cell 21 during discharge and charging, so as to improve the reliability of the energy storage device 100.

[0164] Please refer to Fig. 9 , and please refer to Fig.10 , Fig.10 An exploded view of the structure of a battery cell 21 provided in some embodiments of the present application. According to some embodiments of the present application, the first wall 211 and the second wall 212 are the wall portions with the largest area of ​​the battery cell 21.

[0165] It can be understood that the first wall 211 is the wall portion with the largest area of ​​the battery cell 21, so as to increase the size of the abutment area between the battery cell 21 and the first separator 11, and increase the size of the abutment area between the battery cells 21, thereby increasing the size of the area for heat exchange between the battery cell 21 and the first separator 11, and at the same time increase the size of 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 increasing the heat exchange efficiency between the battery cells 21, thereby further reducing the risk of excessive temperature of the battery cell assembly 20 due to heat generation during the discharge and charging process of the battery cell 21.

[0166] In some embodiments, reference Fig.10The battery cell 21 includes a shell 214 and a first electrode assembly 213. The first electrode assembly 213 is accommodated in the shell 214. The first electrode assembly 213 includes a positive electrode sheet and a negative electrode sheet. The first electrode assembly 213 has a straight area. The part of the positive electrode sheet located in the straight area and the part of the negative electrode sheet located in the straight area are stacked along the height direction Z.

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

[0168] The material of the shell 214 can be metal or a combination of metal and non-metal. For example, the shell 214 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy. For another example, part of the shell 214 can be made of metal, and the rest can be made of non-metal. For example, the end cap of the shell 214 can be made of metal, and the other parts of the shell 214 can be made of non-metallic materials. The shell 214 can be adapted to the shape of the first electrode assembly 213. For example, in Fig.10 In the embodiment, the first electrode assembly 213 is a rectangular parallelepiped structure, and a housing 214 with a rectangular parallelepiped structure can be selected.

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

[0170] It can be understood that since the straight area of ​​the first electrode assembly 213 is prone to expansion, and since the portion of the positive electrode sheet located in the straight area and the portion of the negative electrode sheet located in the straight 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 shell 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, and thus it is more necessary to limit their expansion.

[0171] In the present 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 are the wall portions with the largest area, so that the expansion deformation of the battery cell 21 in the height direction Z is the largest. By abutting the first wall 211 of the battery cell 22 at the first end against the first partition 11 located at the top of the accommodating space, and abutting the second wall 212 of the battery cell 23 at the second end against the first partition 11 located at the bottom of the accommodating space, the deformation of the battery cell 21 in the direction of maximum deformation is better limited, and the risk of rupture of the outer shell 214 of the battery cell 21 due to excessive expansion and deformation of the battery cell 21, which leads to sealing failure of the outer shell 214 of the battery cell 21, is further reduced, thereby improving The reliability of the battery cell 21; on the other hand, the first wall 211 and the second wall 212 are the largest wall portions, thereby increasing the area of ​​the first end battery cell 22 and the second end battery cell 23 abutting against the first separator 11 relative to the situation where the first end battery cell 22 and the second end battery cell 23 use other wall portions to abut against the first separator 11, thereby increasing the area of ​​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 cell 21 in the battery cell assembly 20, thereby further reducing the risk of overheating of the battery cell assembly 20 due to heat generation during discharge and charging of the battery cell 21, so as to improve the reliability of the energy storage device 100.

[0172] According to some embodiments of the present application, referring to Fig.10 The battery cell 21 includes a housing 214 and a first electrode assembly 213, the first electrode assembly 213 is accommodated in the housing 214, the first electrode assembly 213 includes two first pole 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 the two first pole tabs 213B is respectively arranged outside the third wall 214A and outside the fourth wall 214B, and the width direction X of the frame is perpendicular to the height direction Z. The first pole 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 a component in the battery cell 21 where an electrochemical reaction occurs. The structure of the first electrode assembly 213 can be various. For example, the first electrode assembly 213 can be a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet. It can also be a laminated structure formed by stacking a positive electrode sheet, a separator and a negative electrode sheet. For example, the separator is a separator, and the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0174] In some embodiments, reference Fig.10 The first electrode assembly 213 includes a first body 213A and two first electrode tabs 213B.

[0175] The first main body 213A is the area where the chemical reaction occurs in the first electrode assembly 213 within the battery cell 21. The first main body 213A is a structure formed by winding the area of ​​the positive electrode plate coated with the positive active material layer, the isolation member and the area of ​​the negative electrode plate coated with the negative active material layer. It mainly works by moving metal ions between the positive electrode plate and the negative electrode plate of opposite polarity.

[0176] The two first tabs 213B are parts of the first electrode assembly 213 for guiding current into and out of the first body 213A. Exemplarily, 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 the present embodiment, the first pole ears 213B of two battery cells 21 adjacent to each other in the height direction Z are connected to electrically connect the two battery cells 21 adjacent to each other in the height direction Z, thereby eliminating the need for additional structural members to electrically connect the two adjacent battery cells 21. Compared with the case where the first pole ears 213B of 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, the assembly of the energy storage device 100 is facilitated, thereby improving the production efficiency of the energy storage device 100.

[0178] Please refer to Fig. 9 and Fig.10 According to some embodiments of the present application, the battery cell 21 also includes a second electrode assembly 215, the second electrode assembly 215 is accommodated in the outer shell 214, and the first electrode assembly 213 and the second electrode assembly 215 are arranged at intervals along the length direction Y of the frame; the second electrode assembly 215 includes two second pole ears 215B with opposite polarities, and one end of the two second pole ears 215B is respectively arranged outside the third wall 214A and outside the fourth wall 214B; the second pole ears 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 a component in the battery cell 21 where an electrochemical reaction occurs. The structure of the second electrode assembly 215 can be various. For example, the second electrode assembly 215 can be a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet. It can also be a laminated structure formed by stacking a positive electrode sheet, a separator and a negative electrode sheet. For example, the separator is a separator, and the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0180] In some embodiments, reference Fig.10 The second electrode assembly 215 includes a second body 215A and two second electrode tabs 215B.

[0181] The second main body 215A is the area where the chemical reaction occurs in the second electrode assembly 215 inside the battery cell 21. The second main body 215A is a structure formed by winding the area of ​​the positive electrode plate coated with the positive active material layer, the isolation member and the area of ​​the negative electrode plate coated with the negative active material layer. It mainly works by moving metal ions between the positive electrode plate and the negative electrode plate of opposite polarity.

[0182] The two second tabs 215B are parts of the second electrode assembly 215 for guiding current into and out of the second body 215A. 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, and in the length direction Y of the frame, the insulating member is located between the second body 215A and the first body 213A to insulate and isolate the second body 215A from the first body 213A.

[0184] It can be understood that the battery cell 21 may further include a third electrode assembly, a fourth electrode assembly and other multiple electrode assemblies, and the multiple electrode assemblies are arranged at intervals along the length direction Y of the frame.

[0185] In the present embodiment, the first electrode assembly 213 and the second electrode assembly 215 are arranged at intervals along the length direction Y of the frame, thereby rationally utilizing the space of the accommodation space in the length direction Y of the frame; by connecting the second pole ears 215B of two battery cells 21 adjacent in the height direction Z to electrically connect the second electrode assemblies 215 of two battery cells 21 adjacent in the height direction, no additional structural parts are required to electrically connect the second electrode assemblies 215 of two adjacent battery cells, thereby, compared with the case of using a busbar to connect the second pole ears 215B of two adjacent battery cells, on the one hand, reducing the production cost of the energy storage device 100; on the other hand, facilitating the assembly of the energy storage device 100 and improving the production efficiency of the energy storage device 100.

[0186] Please refer to Fig.11 , Fig.11 for Figure 4 According to some embodiments of the present application, along the width direction X of the frame, the frame 10 has a first side 101 and a second side 102 that are oppositely disposed, and a portion of one of the two first tabs 213B exceeds the first side 101 , and a portion of the other exceeds the second side 102 .

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

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

[0189] In this embodiment, a portion of one of the two first pole ears 213B extends beyond the first side 101, and a portion of the other extends beyond the second side 102. Thus, when the length of the first pole ear 213B is constant, the space occupied by the first pole ear 213B in the accommodation space is reduced, so that the accommodation space can have more space for accommodating the first electrode assembly 213 of the battery cell 21, thereby increasing the volume energy density of the energy storage device 100.

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

[0191] The first pole lugs 213B of two adjacent battery cells 21 in the battery cell assembly 20 are welded, that is, a partial area of ​​the first pole lug 213B of one battery cell 21 and a partial area of ​​the first pole lug 213B of the other battery are melted to each other and then fixedly connected, or a partial area of ​​the first pole lug 213B of one battery cell 21 and a partial area of ​​the first pole lug 213B of the other battery and the welding material are melted to each other and then fixedly connected, so that a partial area of ​​the first pole lug 213B of one battery cell 21 and a partial area of ​​the first pole lug 213B of the other battery are melted into one. Exemplarily, there may be multiple ways to weld the first pole ears 213B of two adjacent battery cells 21 in a battery cell assembly 20. For example, the first pole ears 213B of two adjacent battery cells 21 in the battery cell assembly 20 may be partially melted by laser welding to achieve welding between the first pole ears 213B of two adjacent battery cells 21 in the battery cell assembly 20. Alternatively, the first pole ears 213B of two adjacent battery cells 21 in the battery cell assembly 20 may be partially melted by ultrasonic welding to achieve welding between the first pole ears 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 are respectively abutted 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 in sequence through the first end battery cell 22 and the second end battery cell 23, which is beneficial 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 welding point of the first pole ear 213B and thereby improving the reliability of the energy storage device 100.

[0193] In this embodiment, the first pole ears 213B of two adjacent battery cells 21 are connected by welding, which can effectively improve the connection firmness and reliability between the first pole ears 213B of the two battery cells 21, and is conducive to reducing the risk of the first pole ears 213B of the two battery cells 21 falling off from each other during use, so as to improve the reliability of the energy storage device 100.

[0194] Please refer to Figure 3 and Figure 4 , and please refer to Figure 7 and Figure 8 According to some embodiments of the present application, the accommodating spaces are multiple and arranged along the height direction Z. The frames 10 are multiple and arranged at intervals along the width direction X of the frames.

[0195] It can be understood that two adjacent accommodating spaces are separated by the first partition 11 .

[0196] In this embodiment, the accommodating spaces are arranged in the height direction, so that when the size of the accommodating space in the height direction Z of the frame 10 is constant, relative to the case where each frame 10 has only one accommodating space, the space of the frame 10 in the height direction Z is more reasonably used, so that the frame 10 can accommodate more battery cell assemblies, and then more battery cells 21, thereby increasing the energy density of the energy storage device 100. The frame 10 is arranged in the width direction X of the frame at intervals, so that when the size of the energy storage box 60 in the width direction X of the frame is constant, relative to the case where each energy storage box 60 only accommodates one frame 10, the space of the energy storage box 60 in the width direction X of the frame is more reasonably used, so that the energy storage box 60 can accommodate more battery cell assemblies 20, and then more battery cells 21, thereby increasing the energy density of the energy storage device 100.

[0197] Please refer to Fig.11 According to some embodiments of the present application, the energy storage device 100 further includes a busbar 30 , which is used to electrically connect two adjacent battery cell assemblies 20 .

[0198] It can be understood that, since a first separator 11 is provided in two adjacent battery cell assemblies 20 in the height direction Z, there is a certain distance between the two adjacent battery cell assemblies 20 in the height direction Z, which makes it inconvenient to directly connect them through the first electrode tab 213B.

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

[0200] Exemplarily, one end of the busbar 30 is welded to the first pole ear 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 pole ear 213B of the second end battery cell 23 of the other upper one of the two adjacent battery cell assemblies 20, so as to connect the two adjacent battery cell assemblies 20 in series or in parallel.

[0201] In the present embodiment, two adjacent battery cell assemblies 20 are connected by the busbar 30 , thereby facilitating the output of currents of the plurality of battery cell assemblies 20 .

[0202] Please refer to Fig.12According to some embodiments of the present application, the energy storage device 100 further includes a bundling member 40 , which is sleeved on the outer periphery of the battery cell assembly 20 .

[0203] The binding member 40 is a structural member that is sleeved on the outer circumference of the battery cell assembly 20 to improve the integrity of the plurality of battery cells 21 in the battery cell assembly 20 .

[0204] For example, the bundle 40 is generally manufactured in a ring shape, and the bundle 40 of a fixed size is used to bundle a plurality of battery cells 21 into a group.

[0205] In some embodiments, reference Fig.12 The winding axis of the binding member 40 is parallel to the width direction X of the frame, and the binding members 40 are multiple and spaced apart along the width direction X of the frame.

[0206] In this embodiment, the bundling piece 40 is sleeved on the outer periphery of the battery cell assembly 20, so that the expansion of the battery cells 21 in the battery cell 21 is limited by the bundling piece 40. On the one hand, the risk of the outer shell 214 of the battery cell 21 rupturing 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, is reduced, thereby improving the reliability of the battery cell 21; on the other hand, the risk of the connection between the first pole ears 213B of two adjacent battery cells 21 being subjected to stress and cracking due to excessive expansion of the battery cell 21 in the height direction Z is reduced, thereby improving the reliability of the energy storage device 100.

[0207] Please refer to Fig.13 , Fig.13 A schematic diagram of the structure of a frame 10 provided in some embodiments of the present application. According to some embodiments of the present application, the frame 10 further includes a connecting member 12, and two adjacent first partitions 11 are connected by the connecting member 12 to form a receiving space.

[0208] The connecting member 12 is a structural member in the frame 10 that connects two adjacent first partition members 11 .

[0209] Exemplarily, the connecting member 12 can be rod-shaped, one end of the connecting member 12 is connected to one of the two adjacent first partitions 11, the connecting member 12 extends along the height direction Z, and the other end of the connecting member 12 is 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 connecting member 12.

[0210] In this embodiment, two adjacent first separators 11 are connected by a connector 12, so that the pressure applied to the first separator 11 by the battery cell assembly 20 carried by the first separator 11 can be transmitted to the first separator 11 or the ground below the first separator 11 through the connector 12, and will not be transmitted to the battery cell assembly 20 below the first separator 11, thereby reducing the risk of abnormal use of the battery cell assembly 20 located at the bottom due to excessive pressure, thereby improving the reliability of the energy storage device 100.

[0211] Please refer to Fig.14 and Fig.15 , Fig.14 and Fig.15 Cross-sectional views of two types of connectors 12 provided for some embodiments of the present application. According to some embodiments of the present 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 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 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 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 higher strength and rigidity, thereby reducing the risk of deformation of the connector 12 when transmitting a large load.

[0213] In some embodiments, reference Fig.14 A first flange is provided at one end of the first sub-connector 121 close to the second sub-connector 122, and a second flange is provided at one end of the second sub-connector 122 close to the second sub-connector 122. The first flange and the second flange are connected by bolts.

[0214] In some embodiments, reference Fig.15 , a through hole for the first sub-connector 121 to pass through is provided at one end of the second sub-connector 122 close to the first sub-connector 121 in the height direction Z, a first mounting hole connected to the through hole is provided on the peripheral side of the second sub-connector 122, a second mounting hole is provided on the peripheral side of the first sub-connector 121, and an end of the first sub-connector 121 close to 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 further 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] Exemplarily, 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 place the battery cell assembly 20 into the accommodating space or remove the battery cell assembly 20; on the other hand, it is convenient to reduce the space occupied by the frame 10 when it is not assembled, which facilitates the transportation of the frame 10.

[0217] Please refer to Fig.16 , Fig.16 An exploded view of the structure of the frame 10 provided for some embodiments of the present application. According to some embodiments of the present application, the topmost one of the plurality of first partitions 11 is the first end partition 11A, the bottommost one of the plurality of first partitions 11 is the second end partition 11B, and the plurality of first partitions 11 further include a middle partition 11C located between the first end partition 11A and the second end partition 11B. The first end partition 11A is provided with a first sub-connector 121 or a second sub-connector 122 on the side facing the second end partition 11B, the second end partition 11B is provided with a first sub-connector 121 or a second sub-connector 122 on the side facing the first end partition 11A, and the middle partition 11C is provided with 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 a 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 the other 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 a first partition 11 located between the first end partition 11A and the second end partition 11B in the height direction Z among the plurality of first partitions 11 .

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

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

[0223] In this embodiment, the first end separator 11A is provided with the first sub-connector 121 or the second sub-connector 122 only on the side facing the second end separator 11B, and the second end separator 11B is provided with the first sub-connector 121 or the second sub-connector 122 only on the side facing the first end separator 11A. Therefore, compared with the situation 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, thereby reducing the space of the frame 10 not used for assembling the battery cell assembly 20. Therefore, when the volume of the frame 10 is constant, the space of the frame 10 for assembling the battery cell assembly 20 is increased, thereby increasing the volume energy density of the energy storage device 100.

[0224] Please refer to Fig.13 According to some embodiments of the present application, there are multiple connecting members 12, and the multiple connecting members 12 are arranged at intervals around the circumference of the first partition 11.

[0225] In this embodiment, a plurality of connecting members 12 are spaced apart around the first partition 11 to uniformly support the first partition 11 and uniformly transfer the pressure borne by the first partition 11 to the first partition 11 located below the first partition 11, thereby improving the structural stability of the frame 10 and further improving the reliability of the energy storage device 100.

[0226] Please refer to Fig.13According to some embodiments of the present application, the frame 10 has a first side 101 and a second side 102 that are oppositely disposed in a width direction X of the frame 10 , the 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 , and 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, an orthographic projection of the first connector 12A overlaps at least partially with the battery cell assembly 20 , and an 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 oppositely disposed in the width direction X of the frame. The first connecting member 12A is the connecting member 12 disposed on the first side 101 , and the second connecting member 12B is the connecting member 12 disposed on the second side 102 .

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

[0229] On the projection plane perpendicular to the width direction X of the frame, the orthographic projection of the first connecting member 12A overlaps with at least part of the battery cell assembly 20, that is, when observed along the width direction X of the frame, the first connecting member 12A and the battery cell assembly 20 share at least part of the space, so that when the battery cell assembly 20 moves along the width direction X of the frame, the first connecting member 12A can limit the battery cell assembly 20 from leaving the accommodation 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 connecting member 12B overlaps with at least part of the battery cell assembly 20, that is, when observed along the width direction X of the frame, the second connecting member 12B and the battery cell assembly 20 share at least part of the space, so that when the battery cell assembly 20 moves along the width direction X of the frame, the second connecting member 12B can limit the battery cell assembly 20 from leaving the accommodation 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 with at least part of the battery cell assembly 20, and the orthographic projection of the second connector 12B overlaps with at least part of the battery cell assembly 20, thereby limiting the movement of the battery cell assembly 20 in the width direction X of the frame by the first connector 12A and the second connector 12B, reducing the risk of the battery cell assembly 20 escaping from the accommodation space along the width direction X of the frame, thereby improving the reliability of the energy storage device 100.

[0232] Reference Fig.17 , Fig.17 A schematic diagram of another structure of a frame 10 provided for some embodiments of the present application. According to some embodiments of the present application, the frame 10 has a third side 103 and a fourth side 104 that are arranged opposite to each other in the length direction Y of the frame 10, and the plurality of connectors 12 include a third connector 12C arranged on the third side 103 and a fourth connector 12D arranged on the fourth side 104, and 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 oppositely arranged in the length direction Y of the frame. The third connecting member 12C is the connecting member 12 arranged on the third side 103 , and the fourth connecting member 12D is the connecting member 12 arranged on the fourth side 104 .

[0234] In some embodiments, a plurality of third connecting members 12C are arranged at intervals along the width direction X of the frame; and a plurality of fourth connecting members 12D are arranged at intervals 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 connecting member 12C at least partially overlaps with the battery cell assembly 20, that is, when observed along the length direction Y of the frame, the third connecting member 12C and the battery cell assembly 20 at least share part of the space, so that when the battery cell assembly 20 moves along the length direction Y of the frame, the third connecting member 12C can limit the battery cell assembly 20 from leaving the accommodating 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 connecting member 12D at least partially overlaps with the battery cell assembly 20, that is, when observed along the length direction Y of the frame, the fourth connecting member 12D and the battery cell assembly 20 at least share part of the space, so that when the battery cell assembly 20 moves along the length direction Y of the frame, the fourth connecting member 12D can limit the battery cell assembly 20 from leaving the accommodating space from the fourth side 104 along the length direction Y of the frame.

[0237] In this embodiment, on the projection plane perpendicular to the length direction Y of the frame, the orthographic projection of the third connecting member 12C at least partially overlaps with the battery cell assembly 20, and the orthographic projection of the fourth connecting member 12D at least partially overlaps with the battery cell assembly 20, thereby limiting the movement of the battery cell assembly 20 in the length direction Y of the frame by the third connecting member 12C and the fourth connecting member 12D, reducing the risk of the battery cell assembly 20 escaping from the accommodation space along the length direction Y of the frame, thereby improving the reliability of the energy storage device 100.

[0238] Please refer to Fig.18 and Fig.19 , Fig.18 A schematic diagram of the structure of an energy storage device 100 provided in some embodiments of the present application (showing an energy storage box 60 and a control compartment 70), Fig.19 for Figure 3 Enlarged view of B in the figure. According to some embodiments of the present application, the energy storage device 100 also 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 accommodated in the compartment body, the control module (not shown in the figure) and the thermal management module (not shown in the figure) are both connected to the energy storage box 60, the control module (not shown in the figure) is used to electrically control the battery cell 21, and the thermal management module (not shown in the figure) is used to manage the temperature of the battery cell 21.

[0239] In some embodiments, reference Fig.19 A flow channel opening 1041 connected to the flow channel 110 is provided on the first partition 11, one end of the connecting tube 111 is connected to the connector, and the other end of the connecting tube 111 is connected to the flow channel opening 1041. It can be understood that there can be two flow channel openings 1041 and two connecting tubes 111. One of the two flow channel openings 1041 is used for the medium to flow into the flow channel 110, and the other of the two flow channel openings 1041 is used for the medium to flow out of the flow channel 110.

[0240] The control chamber 70 may be an independent chamber, and the control module (not shown in the figure) and the thermal management module (not shown in the figure) are both contained in the chamber. The control chamber 70 may be detachably connected to the energy storage box 60, for example, by snap-fitting or bolt-locking connection; the control chamber 70 may be fixedly connected to the energy storage box 60, for example, by welding; or the chamber and the energy storage box 60 may be placed separately.

[0241] In some embodiments, the control bin 70 is hung on one side of the energy storage box 60 along the length direction Y of the frame or the width direction X of the frame. Exemplarily, the control bin 70 is hung on one side of the energy storage box 60 along the length direction Y of the frame. By hanging the control bin 70 on one side of the energy storage box 60 along the length direction Y of the frame or the width direction X of the frame, the installation or removal of the control bin 70 is convenient.

[0242] The warehouse body may also be a collection of multiple independent warehouses. For example, the warehouse body includes multiple warehouse parts, the thermal management module (not shown in the figure) is arranged in one part of the warehouse parts, and the control module (not shown in the figure) is arranged in another part of the warehouse parts.

[0243] In some embodiments, the warehouse body is separated from the energy storage box 60. The warehouse body of the control warehouse 70 and the energy storage box 60 do not contact each other, and the thermal management module and the control module in the control warehouse 70 can be connected to the energy storage box 60 through pipes and cables. The interference between the warehouse body and the energy storage box 60 is reduced, so that the setting method of the control warehouse 70 and the energy storage box 60 is more free.

[0244] In some embodiments, the warehouse body includes a first warehouse and a second warehouse separated from the first warehouse, the thermal management module is accommodated in the first warehouse, and the first warehouse is located on the top of the topmost energy storage box. The control module includes a main control module, a power distribution module, a master control module and a fire control module, the battery cell is electrically connected to the main control module, the main control module is electrically connected to the master control module, the main control module, the master 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 warehouse, and at least one of the power distribution module, the master control module and the fire control module is located in the first warehouse.

[0245] Exemplarily, the second compartment and the energy storage box 60 may be placed separately; or, the second compartment is disposed in the accommodating 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 master control module and a fire control module (not shown in the figure). The main control module, the power distribution module, the master control module and the fire control module (not shown in the figure) may be located in the same compartment, or they may be separately arranged in different compartments. The main control module is used to control the input and output of the high-voltage electric energy of the battery cells in the energy storage box 60. The master control module is used to control the switch action of the main control module in the energy storage box 60. The fire control module (not shown in the figure) is used to control the action of the fire fighting element when the temperature of the energy storage box 60 is unbalanced and a fire occurs. The fire fighting element may be a fire extinguisher, etc. The fire fighting element may be arranged in the control compartment 70 or in the energy storage box 60. The power distribution module is used to electrically connect the main control module, the master control module and the fire fighting control module (not shown in the figure) so as to facilitate the circuit conduction of the main control module, the master control module and the fire fighting control module (not shown in the figure) and maintain the normal operation of the main control module, the master control module and the fire fighting control module (not shown in the figure).

[0247] In this embodiment, by setting a control module (not shown in the figure), the control module (not shown in the figure) can control the input or output of electric energy of the battery cell 21, and realize electrical control of the battery cell 21; by setting a thermal management module (not shown in the figure), the thermal management module (not shown in the figure) can manage the temperature of the battery cell 21, and reduce the risk of temperature runaway of the battery cell 21. The warehouse body can integrate the control module (not shown in the figure) and the thermal management module (not shown in the figure), which is conducive to the maintenance of the control module (not shown in the figure) and the thermal management module (not shown in the figure).

[0248] Please refer to Figure 3 and Fig. 20 , Fig. 20 A schematic diagram of the structure of the frame 10 provided in some embodiments of the application from another perspective. According to some embodiments of the present application, the energy storage box 60 includes a box body 61 and a box door (not shown in the figure); a receiving cavity with an opening is formed inside the box body 61; 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, and 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, and the frame body 14 has a third side 103 facing the fifth wall in the length direction Y of the frame 10, and the guide portion 13 protrudes from the third side 103 along the length direction Y of the frame, and the guide portion 13 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 frame 10.

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

[0250] The body is the portion of the frame 10 for placing the battery cell assembly 20 . The third side 103 and the fourth side 104 are two sides of the frame body 14 that are oppositely disposed in the length direction Y of the frame. The third side 103 is farther away from the opening than the fourth side 104 .

[0251] The guide portion 13 is a portion of the third side 103 that protrudes along the length direction Y 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 accommodating cavity along the length direction Y of the frame, the guide portion 13 can guide itself into the recessed portion to guide the frame 10 to a preset installation position.

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

[0254] In this embodiment, the guide portion 13 is used to guide the frame 10 to be inserted into the recessed portion 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] Please refer to Figure 3 and Fig.19According to some embodiments of the present application, the energy storage box 60 includes a plurality of second partitions 62, which are arranged in the accommodating cavity, and both ends of the second partitions 62 in the height direction Z are connected to the box body 61. The plurality of second partitions 62 are arranged at intervals along the width direction X of the frame 10 to divide the accommodating cavity into a plurality of sub-accommodating cavities, each of which accommodates 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 used to partition the accommodating cavity in the energy storage box 60. Exemplarily, the second partition 62 may 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 partitions 62 are arranged at intervals along the width direction X of the frame to divide the accommodating cavity into a plurality of sub-accommodating cavities, each of which accommodates a frame 10, thereby reducing the risk of the first pole ears 213B of the battery cells 21 of different frames 10 abutting against each other in the width direction X of the frame, causing an internal short circuit in the energy storage device 100.

[0258] Please refer to Fig.19 According to some embodiments of the present application, along the length direction Y of the frame, the frame 10 has a fourth side 104, the fourth side 104 is arranged 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 connecting member 63, one end of the fifth connecting member 63 is detachably connected to the fourth side 104, and the other end of the fifth connecting member 63 is connected to the fifth side.

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

[0260] The fifth connecting member 63 is a structural member used to connect the fifth side and the fourth side 104 to limit the movement of the frame 10 in the length direction of the frame 10. Exemplarily, the fifth connecting member 63 can be a metal member, so that the fifth connecting member 63 has a certain structural strength, thereby reducing the risk of the frame 10 escaping from the accommodating cavity through the opening along the length direction Y of the frame.

[0261] The fifth connecting member 63 can be connected to the fourth side 104 and the fifth side by welding, clamping, riveting, etc.

[0262] In some embodiments, one end of the fifth connecting member 63 is detachably connected to the fourth side 104 via a bolt connection, and the other end of the fifth connecting member 63 is connected to the fifth side via a bolt connection.

[0263] In this embodiment, one end of the fifth connecting member 63 is detachably connected to the fourth side 104, and the other end of the fifth connecting member 63 is connected to the fifth side. On the one hand, the fifth connecting member 63 and the fifth wall cooperate to limit the movement of the frame 10 in the length direction Y of the frame, thereby reducing the risk of the frame 10 escaping from the sub-accommodation cavity along the length direction Y of the frame and improving the reliability of the energy storage device 100. On the other hand, the movement of the frame 10 in the width direction X of the frame is limited by the fifth connecting member 63, thereby reducing the risk of the first pole ear 213B of the battery cell 21 abutting against the second separator 62 in the width direction X of the frame, thereby reducing the risk of internal short circuit in the energy storage device 100.

[0264] According to some embodiments of the present application, see Figures 3 to 20As shown, the present 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 partitions 11 arranged at intervals along the height direction Z, and a receiving space is formed between two adjacent first partitions 11. Each receiving space receives a battery cell assembly 20, and the first partition 11 located at the bottom of the receiving space is used to carry the battery cell assembly 20. The energy storage box 60 has a receiving cavity, and the frame 10 is received in the receiving cavity. Among them, each first partition 11 is a thermal management component, and the thermal management component is used to adjust the temperature of the battery cell 21. The energy storage device 100 further includes a connecting tube (not shown in the figure) and a thermal management module; one end of the connecting tube (not shown in the figure) 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 tube 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 cell 21. The battery cell assembly 20 includes a plurality of battery cells 21, at least one of the plurality of battery cells 21 abuts against the first partition 11 located at the top of the accommodation space, and at least one of the plurality of battery cells 21 abuts against the first partition 11 located at the bottom of the accommodation 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 arranged opposite to each other in the height direction Z. The topmost one of the plurality of battery cells 21 is a 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 accommodation space. The bottommost one of the plurality of 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 accommodation 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, the first electrode assembly 213 is accommodated in the housing 214, and the first electrode assembly 213 includes two first pole tabs 213B with opposite polarities, and the housing 214 has a third wall 214A and a fourth wall 214B arranged oppositely in the width direction X of the frame 10, and one end of the two first pole tabs 213B is respectively arranged outside the third wall 214A and outside the fourth wall 214B, and the width direction X of the frame is perpendicular to the height direction Z. The first electrode 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 .The battery cell 21 further includes a second electrode assembly 215, which is accommodated in the housing 214, and the first electrode assembly 213 and the second electrode assembly 215 are arranged at intervals along the length direction Y of the frame; the second electrode assembly 215 includes two second pole ears 215B with opposite polarities, and one end of the two second pole ears 215B is respectively arranged outside the third wall 214A and outside the fourth wall 214B; the second pole ears 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, and a portion of one of the two first pole ears 213B exceeds the first side 101, and a portion of the other exceeds the second side 102. The first pole ears 213B of two adjacent battery cells 21 in the battery cell assembly 20 are welded. The energy storage device 100 further includes a busbar 30, which is used to electrically connect two adjacent battery cell assemblies 20. The energy storage device 100 further includes a bundling member 40, which is sleeved on the outer periphery of the battery cell assembly 20. The frame 10 further includes a connector 12, through which two adjacent first separators 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 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. The topmost one of the plurality of first separators 11 is a first end separator 11A, the bottommost one of the plurality of first separators 11 is a second end separator 11B, and the plurality of first separators 11 further include a middle separator 11C located between the first end separator 11A and the second end separator 11B. The first end separator 11A is provided with a first sub-connector 121 or a second sub-connector 122 on one side facing the second end separator 11B, the second end separator 11B is provided with a first sub-connector 121 or a second sub-connector 122 on one side facing the first end separator 11A, and the middle separator 11C is provided with a first sub-connector 121 and / or a second sub-connector 122 on both sides in the height direction Z. There are a plurality of connectors 12, and the plurality of connectors 12 are arranged at intervals around the circumference of the first separator 11. The frame 10 has a first side 101 and a second side 102 that are arranged oppositely in the width direction X of the frame 10, and the plurality of connectors 12 include a first connector 12A arranged on the first side 101 and a second connector 12B arranged on the second side 102, and 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 .The frame 10 has a third side 103 and a fourth side 104 arranged opposite to each other in the length direction Y of the frame 10. The plurality of connectors 12 include a third connector 12C arranged on the third side 103 and a fourth connector 12D arranged 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 part of the battery cell assembly 20, and the orthographic projection of the fourth connector 12D overlaps at least part of the battery cell assembly 20. 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 accommodated in the compartment body. The control module (not shown in the figure) and the thermal management module (not shown in the figure) are both connected to the energy storage box 60. The control module (not shown in the figure) is used to electrically control the battery cell 21, and the thermal management module (not shown in the figure) is used to manage the temperature of the battery cell 21. The energy storage box 60 includes a box body 61 and a box door (not shown in the figure); a receiving cavity with an opening is formed inside the box body 61; 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, and 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, and the frame body 14 has a third side 103 facing the fifth wall in the length direction Y of the frame 10, and the guide portion 13 protrudes from the third side 103 along the length direction Y of the frame, and the guide portion 13 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. The energy storage box 60 includes a plurality of second partitions 62, and the second partitions 62 are arranged in the receiving cavity, and both ends of the second partitions 62 in the height direction Z are connected to the box body 61. A plurality of second partitions 62 are arranged at intervals along the width direction X of the frame 10 to divide the accommodating cavity into a plurality of sub-accommodating cavities, each of which accommodates the frame 10. Along the length direction Y of the frame, the frame 10 has a fourth side 104, the fourth side 104 is arranged opposite to the third side 103, and the second partition 62 has a fifth side facing the opening; the energy storage device 100 further includes a fifth connecting member 63, one end of the fifth connecting member 63 is detachably connected to the fourth side 104, and the other end of the fifth connecting member 63 is connected to the fifth side.

[0265] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0266] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An energy storage device, characterized in that: include: A battery cell assembly, comprising at least one battery cell; A frame having a plurality of first separators spaced apart along its height direction, a receiving space being formed between two adjacent first separators, the receiving space receiving the battery monomer assembly, and the first separator located at the bottom of the receiving space being used to carry the battery monomer assembly; The energy storage box has a receiving cavity, and the frame is received in the receiving cavity; Among two adjacent first separators, at least one of the first separators is a heat management component, and the heat management component is used to adjust the temperature of the battery cell.

2. The energy storage device according to claim 1, characterized in that Each of the first partitions is the heat management component.

3. The energy storage device according to claim 1, characterized in that: 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, 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.

4. The energy storage device according to claim 1, characterized in that: The battery cell assembly includes a plurality of battery cells, at least one of which contacts the first partition located at the top of the accommodation space, and at least one of which abuts the first partition located at the bottom of the accommodation space.

5. The energy storage device according to claim 4, characterized in that: A plurality of battery cells in the battery cell assembly are stacked along the height direction, and the battery cells have a first wall and a second wall oppositely arranged in the height direction; The topmost one 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 accommodation space; The one located at the bottom 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 accommodation space.

6. The energy storage device according to claim 5, characterized in that: The first wall and the second wall are the wall portions of the battery cell having the largest area.

7. The energy storage device according to claim 5, characterized in that: The battery cell comprises a housing and a first electrode assembly, wherein the first electrode assembly is accommodated in the housing, the first electrode assembly comprises two first pole tabs with opposite polarities, the housing comprises a third wall and a fourth wall which are arranged opposite to each other in the width direction of the frame, one end of the two first pole tabs are arranged outside the third wall and outside the fourth wall respectively, and the width direction of the frame is perpendicular to the height direction; The first electrode 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.

8. The energy storage device according to claim 7, characterized in that: The battery cell further includes a second electrode assembly, the second electrode assembly is accommodated in the housing, and the first electrode assembly and the second electrode assembly are spaced apart along the length direction of the frame; The second electrode assembly includes two second electrode tabs with opposite polarities, and one end of the two second electrode tabs is respectively arranged outside the third wall and outside the fourth wall; The second electrode 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 according to claim 7, characterized in that: Along the width direction of the frame, the frame has a first side and a second side that are opposite to each other, a portion of one of the two first pole tabs exceeds the first side, and a portion of the other exceeds the second side.

10. The energy storage device according to claim 7, characterized in that: The first tabs of two adjacent battery cells in the battery cell assembly are welded.

11. The energy storage device according to claim 1, characterized in that: The accommodating spaces are multiple and arranged along the height direction; The frame is a plurality of frames arranged at intervals along the width direction thereof.

12. The energy storage device according to claim 1, characterized in that: The energy storage device further includes a busbar, which is used to electrically connect two adjacent battery cell assemblies.

13. The energy storage device according to claim 1, characterized in that: The energy storage device further comprises a bundling piece, and the bundling piece is sleeved on the outer circumference of the battery monomer assembly.

14. The energy storage device according to claim 1, characterized in that: The frame further includes a connecting piece, and two adjacent first partitions are connected by the connecting piece to form the accommodating space.

15. The energy storage device according to claim 14, characterized in that: The connecting member includes a first sub-connecting member and a second sub-connecting member, one end of the first sub-connecting member is connected to one of the two adjacent first partitions, and the second sub-connecting member is connected to the other of the two adjacent first partitions; 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 according to claim 15, characterized in that: The topmost one of the plurality of first partitions is a first end partition, the bottommost one of the plurality of first partitions is a second end partition, and the plurality of first partitions further include a middle partition located between the first end partition and the second end partition; The first end separator is provided with the first sub-connector or the second sub-connector on the side facing the second end separator, the second end separator is provided with the first sub-connector or the second sub-connector on the side facing the first end separator, and the first sub-connector and / or the second sub-connector are respectively provided with the first sub-connector and / or the second sub-connector on both sides of the middle separator in the height direction.

17. The energy storage device according to claim 16, characterized in that: There are a plurality of the connecting members, and the plurality of the connecting members are arranged at intervals around the circumference of the first partition.

18. The energy storage device according to claim 17, characterized in that: The frame has a first side and a second side oppositely disposed in a width direction thereof, the plurality of connecting members include a first connecting member disposed on the first side and a second connecting member disposed on the second side, and the width direction of the frame is perpendicular to the height direction; On a projection plane perpendicular to the width direction of the frame, an orthographic projection of the first connector overlaps at least partially with the battery cell assembly, and an orthographic projection of the second connector overlaps at least partially with the battery cell assembly.

19. The energy storage device according to claim 17, characterized in that: The frame has a third side and a fourth side that are oppositely arranged in the length direction thereof, the plurality of connecting members include a third connecting member arranged on the third side and a fourth connecting member arranged 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, an orthographic projection of the third connector overlaps at least partially with the battery cell assembly, and an orthographic projection of the fourth connector overlaps at least partially with the battery cell assembly.

20. The energy storage device according to claim 1, characterized in that: The energy storage device also includes: The control compartment comprises a compartment body, a control module and a thermal management module. The control module and the thermal management module are accommodated in the compartment body. The control module is used to electrically control the battery cells, and the thermal management module is used to manage the temperature of the battery cells.

21. The energy storage device according to claim 20, characterized in that: The energy storage box comprises: a box body and a box door, wherein the interior of the box body forms the accommodating cavity having an opening, and the box door covers the opening; The box body has a fifth wall 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 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 along the length direction of the frame, and the guide portion is used to guide it to be inserted into the recessed portion along the length direction of the frame to limit the frame body.

22. The energy storage device according to claim 21, characterized in that The energy storage box includes a plurality of second partitions, the second partitions are arranged in the accommodating cavity, and both ends of the second partitions in the height direction are connected to the box body; A plurality of the second partitions are spaced apart along the width direction of the frame to divide the accommodating cavity into a plurality of sub-accommodating cavities, each of which accommodates the frame, and 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 according to claim 22, characterized in that: Along the length direction of the frame, the frame body has a fourth side, the fourth side is arranged opposite to the third side, and the second partition has a fifth side facing the opening; The energy storage device further includes a fifth connecting member, 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, characterized in that: include: Power conversion devices; The energy storage device according to any one of claims 1 to 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 to 23, characterized in that the energy storage device is used to provide electrical energy to the charging pile.

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