Box body, box body assembly, battery and electric device

Abstract

The invention provides a box body, a box body assembly, a battery and a power utilization device. The box body comprises an end wall; the side wall is arranged on the periphery of the end wall in a surrounding mode, and the side wall and the end wall jointly define a containing space with an opening in a surrounding mode; the first flange part is arranged at the end, away from the end wall, of the side wall, and at least part of the first flange part protrudes out of the inner surface of the side wall. According to the technical scheme, part or all of the first flange part protrudes out of the inner surface of the side wall of the box body, so that the first flange part can share part of the containing space, the size of the first flange part extending to the outer side of the box body is reduced, or the first flange part is prevented from extending to the outer side of the box body; therefore, the space outside the box body occupied by the first flange part is reduced or the space outside the box body occupied by the first flange part is avoided, the space outside the box body originally reserved for the first flange part can be contained in the box body, the overall containing space of the box body is increased, and space waste is reduced. And the energy density and the grouping efficiency of the battery using the box body are improved.

Description

Box, box components, batteries and electrical devices Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a box, a box assembly, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In battery technology, how to improve the energy density of batteries is a technical problem that needs to be solved urgently.

[0004] Summary of the Invention

[0005] The present application provides a box, a box assembly, a battery and an electrical device, which can effectively improve the energy density of the battery.

[0006] In a first aspect, the present application provides a box body, which includes: an end wall; a side wall, which is arranged around the end wall, and the side wall and the end wall together form a accommodating space with an opening; a first flange portion, which is arranged at an end of the side wall away from the end wall, and at least part of the first flange portion protrudes from the inner surface of the side wall.

[0007] In the technical solution of the present application, the first flange portion of the side wall of the box body provides a connection surface for the box body, and part or all of the first flange portion protrudes from the inner surface of the side wall of the box body, so that the first flange portion can share part of the accommodation space, reducing the size of the first flange portion extending to the outside of the box body or avoiding the first flange portion extending to the outside of the box body, thereby reducing the space outside the box body occupied by the first flange portion or avoiding the first flange portion occupying the space outside the box body, and then the space outside the box body originally reserved for the first flange portion can be incorporated into the box body to increase the overall accommodation space of the box body, reduce space waste, and improve the energy density and grouping efficiency of the battery using the box body.

[0008] According to some embodiments of the present application, the first flange portion is integrally formed with the side wall.

[0009] In the above technical solution, the first flange portion and the side wall are integrally formed to improve the structural strength of the first flange portion and the entire box body, thereby improving the structural stability of the box body.

[0010] According to some embodiments of the present application, the first flange portion is provided with a threaded hole.

[0011] In the above technical solution, the first flange portion is provided with threaded holes, which facilitate connecting the box with other accessories or fixing the box to the carrier through the threaded holes, thereby improving the convenience of installing the box.

[0012] According to some embodiments of the present application, the first flange portion has a first flange surface facing away from the end wall, and the width of the first flange surface is D, satisfying 10 mm ≤ D ≤ 30 mm.

[0013] In the above technical solution, the side of the first flange facing away from the end wall forms a first flange surface for connection. If the width of the first flange surface is too small, the width of the connection area provided by the first flange is too small, which is not conducive to improving the reliability of the connection or sealing of the box. If the width of the first flange surface is too large, the width of the first flange portion is too large, and the height of the first flange portion protruding from the inner surface of the side wall is also correspondingly large, which tends to excessively block the opening of the storage space and hinder the installation of battery cells into the box. Designing the width D of the first flange surface between 10mm and 30mm can improve the reliability of the first flange surface connection while avoiding excessive obstruction of the opening of the storage space by the first flange portion, thereby fully utilizing the space within the box and improving the energy density of batteries using the box.

[0014] According to some embodiments of the present application, the first flange portion has a first flange surface facing away from the end wall, the first flange portion includes a first sub-portion and a second sub-portion, the first sub-portion connects the second sub-portion and the side wall, and along a direction perpendicular to the first flange surface, the thickness of the first sub-portion is greater than the thickness of the second sub-portion.

[0015] In the above technical solution, the first flange portion includes a second sub-portion and a first sub-portion whose thickness is greater than that of the second sub-portion. The first sub-portion connects the side wall and the second sub-portion. The first sub-portion plays a structural reinforcement role by increasing the structural thickness, thereby further improving the structural strength of the first flange portion.

[0016] According to some embodiments of the present application, the first sub-portion is provided with a threaded hole.

[0017] In the above technical solution, the thickness of the first subsection is greater than that of the second subsection. The threaded holes are located in the first subsection, which increases the processing depth of the threaded holes, thereby improving the connection stability and structural stability of the box body under stress. Furthermore, the threaded holes are located in the thicker first subsection of the first flange, which reduces their impact on the structural strength of the first flange, thereby improving the structural strength and stability of the box body itself.

[0018] According to some embodiments of the present application, the side wall includes two first side walls arranged opposite to each other along a first direction and two second side walls arranged opposite to each other along a second direction, the first direction is perpendicular to the second direction, and the first flange portion is arranged at one end of the first side wall away from the end wall.

[0019] In the above technical solution, the side wall includes two first side walls opposite to each other along the first direction, and the first flange portion is arranged at the end of the first side wall away from the end wall. Part or all of the first flange portion protrudes from the inner surface of the first side wall, which can reduce the occupancy rate of the first flange portion on the external space of the box in the first direction, thereby increasing the size of the box in the first direction accordingly. In actual applications, the battery cells installed in the accommodating space and the first flange portion can share part of the space of the box in the first direction, thereby improving the energy density and grouping efficiency of the battery using the box.

[0020] According to some embodiments of the present application, the box body further includes: a second flange portion, the second flange portion extending outward from an end of one of the second side walls away from the end wall.

[0021] In the above technical solution, the second flange extends outward from the end of the second side wall away from the end wall. This second flange further increases the flange surface area of ​​the box, improving the stability of the box connection and the balance of force. Furthermore, the outward extension of the second flange prevents it from blocking the opening of the storage space, facilitating battery installation and fully utilizing the internal space of the box, thereby increasing the battery's energy density.

[0022] According to some embodiments of the present application, the box body further includes: a third flange portion, the third flange portion is arranged at an end of the other second side wall away from the end wall, and at least a portion of the third flange portion protrudes from the inner surface of the other second side wall.

[0023] In the above technical solution, the third flange portion is arranged at the end of the other second side wall away from the end wall, and part or all of the third flange portion protrudes from the inner surface of the second side wall, which can reduce the occupancy rate of the third flange portion on the external space of the box in the second direction, thereby correspondingly increasing the size of the box in the second direction. In actual applications, the battery cells installed in the accommodating space and the third flange portion can share part of the space of the box in the second direction, which is also beneficial to improving the energy density and grouping efficiency of the battery using the box.

[0024] According to some embodiments of the present application, a dimension of the end wall in the first direction is smaller than a dimension in the second direction.

[0025] In the above technical solution, the first flange portion is located on both sides of the width direction of the box body, and part or all of the first flange portion protrudes from the inner surface of the first side wall, which can reduce the size of the first flange portion extending to the outside of the box body or avoid the first flange portion extending to the outside of the box body, thereby reducing the external space occupied by the first flange portion in the width direction of the box body, so that the space outside the box body originally reserved for the first flange portion can be incorporated into the box body to increase the overall accommodation space of the box body. When multiple boxes are arranged side by side along the width direction of the box body, the space waste of multiple boxes can be further reduced, and the energy density and grouping efficiency of the battery using the box body can be improved.

[0026] According to some embodiments of the present application, the thickness of the side wall is T, satisfying 1mm≤T≤6mm.

[0027] In the above technical solution, the side walls and end walls together form a accommodating space with an opening. If the thickness of the side walls is too small, the structural strength of the box body is low and it is easy to deform under force. If the thickness of the side walls is too large, the side walls will take up more space, which is not conducive to improving the energy density and grouping efficiency of the battery. Designing the thickness of the side walls between 1mm and 6mm can improve the structural strength of the box body and, at the same time, help improve the energy density and grouping efficiency of the battery using the box body.

[0028] According to some embodiments of the present application, the maximum height of the box along a direction perpendicular to the end wall is H1, satisfying 50 mm ≤ H1 ≤ 300 mm.

[0029] In the above technical solution, if the height of the box is designed to be too small, the box's storage space will be insufficient to accommodate the battery cells, or the size of the battery cells that can be accommodated will be too small, making the battery manufacturing process more difficult and not conducive to improving the energy density of the battery using the box. If the height of the box is designed to be too large, it will not be conducive to the development of miniaturization and lightweighting of the box, and there may be a lot of empty space inside the box, which is also not conducive to improving the energy density of the battery using the box. Designing the box height between 50mm and 300mm is conducive to fully utilizing the box space and improving the energy density of the battery using the box.

[0030] According to some embodiments of the present application, the end wall is provided with a mounting portion for mounting the box on an electrical device.

[0031] In the above technical solution, a mounting portion is provided on the end wall, which facilitates the installation of the box on the electrical device through the mounting portion. At the same time, the mounting portion is provided on the end wall, which can reduce the size of the mounting portion extending to the outside of the box, thereby reducing the space occupied by the mounting portion outside the box, which is also beneficial to improving the energy density of the battery using the box.

[0032] According to some embodiments of the present application, a flow channel for accommodating a heat exchange medium is provided inside the end wall.

[0033] In the above technical solution, a flow channel for accommodating a heat exchange medium is provided inside the end wall, so that the end wall can regulate the temperature of the battery cells accommodated in the accommodation space, which is beneficial to improving the temperature controllability and uniformity of the battery; at the same time, it improves the functional integration of the box, which is beneficial to simplifying the battery structure and improving the battery energy density.

[0034] According to some embodiments of the present application, the side wall is provided with a hoisting hole for hoisting the box body.

[0035] In the above technical solution, the side walls are provided with lifting holes to facilitate the lifting and transportation of the box. At the same time, the lifting holes do not occupy additional space in the length or width direction of the box, which is also conducive to improving the energy density of the battery.

[0036] In a second aspect, the present application provides a box assembly, comprising: a box as in any of the above solutions; and a cover, the cover being used to cover the opening and connected to the first flange portion.

[0037] In the above technical solution, the box assembly includes a box body and a cover body, and the cover body is connected to the first flange portion, so that the cover body can close the opening of the accommodating space, isolate the accommodating space from the external environment, and improve the sealing performance of the box body.

[0038] According to some embodiments of the present application, the cover body includes: a main body, used to cover the opening and connected to the first flange portion, the main body having a first surface facing the opening; a flange portion, extending from the edge of the main body toward the direction close to the end wall, and the flange portion is configured to cover at least a portion of the outer surface of the side wall.

[0039] In the above technical solution, the cover body includes a main body covering the opening of the box body and a flange portion extending from the edge of the main body, and the flange portion extends in a direction close to the end wall. After the cover body is closed on the opening of the box body, the flange portion can at least partially cover the outer surface of the side wall of the box body. The flange portion plays a guiding and auxiliary sealing role in the mutual covering of the box body and the cover body.

[0040] According to some embodiments of the present application, a groove is provided on the outer surface of the side wall, and the flange portion is at least partially accommodated in the groove.

[0041] In the above technical solution, a groove is provided on the outer surface of the side wall, and part or all of the flange portion is accommodated in the groove. The setting of the groove can reduce the size of the flange portion protruding from the outer surface of the side wall or avoid the flange portion protruding from the outer surface of the side wall, thereby reducing the external space of the box body occupied by the flange portion alone or avoiding the flange portion occupying the external space of the box body alone. The flange portion and the side wall share part of the horizontal space of the box body, which is conducive to further improving the energy density and grouping efficiency of the battery using the box body.

[0042] According to some embodiments of the present application, the side wall includes two first side walls arranged opposite to each other along a first direction and two second side walls arranged opposite to each other along a second direction, the first direction is perpendicular to the second direction, the first flange portion is arranged at an end of the first side wall away from the end wall; the groove is arranged on the outer surface of the first side wall.

[0043] In the above technical solution, the groove is arranged on the outer surface of the first side wall, so the first side wall and the flange portion of the box body share part of the space of the box body along the first direction, which is beneficial for the battery cells to fully utilize the space of the box body in the first direction, thereby improving the energy density and grouping efficiency of the battery using the box body.

[0044] According to some embodiments of the present application, the maximum height of the cover body along a direction perpendicular to the end wall is H2, satisfying H2≤10 mm.

[0045] In the above technical solution, the greater the height of the cover, the more space it occupies, and the more serious the space waste of the battery using the box. Designing the maximum height of the cover to be within 10 mm can reduce the space waste of the cover on the box, thereby improving the energy density and grouping efficiency of the battery using the box.

[0046] According to some embodiments of the present application, the cover body is riveted or screwed to the first flange portion.

[0047] In the above technical solution, the cover body and the first flange portion are riveted or screwed, which makes assembly and disassembly easy, and the connection is stable, which facilitates the grouping of the box assembly.

[0048] According to some embodiments of the present application, the box assembly further includes a seal, at least a portion of which is disposed between the cover and the first flange portion.

[0049] In the above technical solution, a seal is provided between the cover and the first flange portion of the box body to achieve a sealed connection between the cover and the box body, which is beneficial to improving the sealing performance of the battery pack.

[0050] In a third aspect, the present application provides a battery, comprising: a box assembly as described in any of the above schemes; and a plurality of battery cells arranged in a accommodating space.

[0051] According to some embodiments of the present application, a plurality of battery cells form a battery module, and at least three battery modules are arranged side by side in a direction parallel to the end wall.

[0052] In the above technical solution, at least three battery modules are arranged side by side in the accommodating space in a direction parallel to the end wall, that is, the opening size of the accommodating space is much larger than the size of the battery module. When the battery module is installed into the box, it can avoid each other with the box, reducing the possibility of the first flange interfering with the installation of the battery module, making it convenient to fully utilize the accommodating space of the box and reduce space waste in the box, which is also beneficial to improving the energy density and grouping efficiency of the battery using the box.

[0053] According to some embodiments of the present application, when viewed in a direction perpendicular to the end wall, the first flange portion has an overlapping area with at least a portion of the plurality of battery cells.

[0054] In the above technical solution, the first flange portion and the battery cell share the space of the box body parallel to the end wall direction, thereby increasing the space occupancy rate of the battery cell in the housing space of the box body, reducing the space waste in the position below the first flange portion of the housing space, and improving the energy density and grouping efficiency of the battery using the box body.

[0055] In a fourth aspect, the present application provides an electrical device comprising a battery according to any of the above schemes, wherein the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0057] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0058] FIG2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0059] FIG3 is an axonometric view of a box provided in some embodiments of the present application;

[0060] FIG4 is a top view of a box provided in some embodiments of the present application;

[0061] FIG5 is a cross-sectional view of the box shown in FIG4 along the AA direction in some embodiments;

[0062] FIG6 is a cross-sectional view of the box shown in FIG4 along the AA direction in some other embodiments;

[0063] FIG7 is a cross-sectional view of the box body shown in FIG4 along the line BB;

[0064] FIG8 is a bottom view of a box provided in some embodiments of the present application;

[0065] FIG9 is a schematic structural diagram of a box assembly provided in some embodiments of the present application;

[0066] FIG10 is a partial enlarged view of portion E shown in FIG9 ;

[0067] FIG11 is an exploded view of a box assembly provided in some embodiments of the present application;

[0068] FIG12 is a partial enlarged view of portion F shown in FIG11 ;

[0069] FIG13 is a cross-sectional schematic diagram of a battery module installed in a box according to some embodiments of the present application.

[0070] In the drawings, the drawings are not drawn to scale.

[0071] Marking instructions: 1000-vehicle; 100-battery; 10-battery module; 11-battery cell; 20-box assembly; 21-box; 211-end wall; 2111-flow channel; 212-side wall; 2121-first side wall; 2122-second side wall; 2123-groove; 213-accommodation space; 214-first flange; 2141-first sub-section; 2142-second sub-section; 2143- First flange surface; 215-threaded hole; 216-second flange portion; 2161-second flange surface; 217-third flange portion; 2171-third flange surface; 218-lifting hole; 219-mounting portion; 22-cover body; 221-main body; 222-flanged portion; 223-first surface; 23-seal; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0072] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0073] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0074] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0075] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0076] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0077] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0078] The term "plurality" used in this application refers to two or more (including two).

[0079] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to this. Battery cells may be flat, rectangular, or in other shapes, and may also be soft-pack battery cells, and the embodiments of this application are not limited to this.

[0080] The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack.

[0081] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The electrode assembly can be a wound or laminated structure, but the embodiments of this application are not limited to this.

[0082] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a key component of today's new energy development. Improving the energy density of batteries is a pressing technical challenge.

[0083] In some technologies, the battery also includes a housing for enclosing one or more battery cells or multiple battery modules. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells. The housing may include a first portion and a second portion, which overlap each other and together define an assembly space for accommodating the battery cells. To facilitate connection, the first portion is often provided with a flange, which connects to the second portion to form a connection area.

[0084] The inventors found that in some technologies, the flange protrudes from the outer surface of the box, and the flange needs to occupy part of the external space of the battery box alone, resulting in a large waste of space and affecting the energy density and grouping efficiency of the battery.

[0085] Based on the above reasons, in order to improve the battery energy density and grouping efficiency, the inventors have designed a box body after research, which includes: an end wall and a side wall surrounding the end wall, and a first flange portion is provided at one end of the side wall away from the end wall, and at least a part of the first flange portion protrudes from the inner surface of the side wall.

[0086] In the technical solution of the present application, the first flange portion of the side wall of the box body provides a connection surface for the box body, and part or all of the first flange portion protrudes from the inner surface of the side wall of the box body, so that the first flange portion can share part of the space with the contents (such as battery cells) arranged in the accommodating space, which can reduce the size of the first flange portion extending to the outside of the box body or avoid the first flange portion extending to the outside of the box body, thereby reducing the space outside the box body occupied by the first flange portion or avoiding the first flange portion occupying the space outside the box body, so that the space outside the box body originally reserved for the first flange portion can be incorporated into the box body to increase the overall accommodating space of the box body, reduce space waste, and improve the energy density and grouping efficiency of the battery using the box body.

[0087] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical device.

[0088] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0089] The battery described in the embodiments of the present application is not limited to being applicable to the electrical devices described above, but can also be applied to all electrical devices that use batteries. However, for the sake of simplicity, the following embodiments are described using an electrical device such as a vehicle as an example.

[0090] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0091] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0092] Please refer to Figure 2, which is a schematic diagram of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 may include a case assembly 20 and a battery cell 11. The battery cell 11 is used to be accommodated in the case assembly 20. In the battery 100, there may be multiple battery cells 11, and the multiple battery cells 11 may be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 11 are connected in series and in parallel. The multiple battery cells 11 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 11 is accommodated in the case assembly 20; of course, the battery 100 can also be a battery module 10 formed by first connecting multiple battery cells 11 in series, in parallel, or in a mixed connection, and then the multiple battery modules 10 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the case assembly 20. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for achieving electrical connection between the multiple battery cells 11.

[0093] Each battery cell 11 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 11 can be cylindrical, flat, rectangular, or in other shapes. For example, the battery cell 11 is a rectangular parallelepiped.

[0094] The box assembly 20 is used to provide an assembly space for the battery cells 11, and the box assembly 20 can adopt a variety of structures. In some embodiments, the box assembly 20 can include a box body 21 and a cover body 22. The box body 21 and the cover body 22 cover each other, and the box body 21 and the cover body 22 together define an assembly space for accommodating the battery cells 11. The box body 21 can be a hollow structure with one end open, and the cover body 22 can be a plate-like structure. The cover body 22 covers the open side of the box body 21, so that the box body 21 and the cover body 22 together define an assembly space; the box body 21 and the cover body 22 can also be hollow structures with one side open, and the open side of the box body 21 covers the open side of the cover body 22. Of course, the box assembly 20 formed by the box body 21 and the cover body 22 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0095] Please refer to Figures 3 to 6. Figure 3 is an isometric view of a box provided in some embodiments of the present application; Figure 4 is a top view of a box provided in some embodiments of the present application; Figure 5 is a cross-sectional view of a box provided in some embodiments of the present application taken along the AA direction in some embodiments; Figure 6 is a cross-sectional view of a box provided in some embodiments of the present application taken along the AA direction in other embodiments; some embodiments of the present application provide a box 21, which includes an end wall 211, a side wall 212, and a first flange portion 214. The side wall 212 is arranged around the end wall 211, and the side wall 212 and the end wall 211 together define a receiving space 213 with an opening. The first flange portion 214 is arranged at an end of the side wall 212 away from the end wall 211, and at least a portion of the first flange portion 214 protrudes from the inner surface of the side wall 212.

[0096] Specifically, the side walls 212 and the end walls 211 together form a hollow structure with an open end. Along the thickness direction of the end wall 211 (the Z direction shown in FIG3 ), the end wall 211 is opposite to the opening. In actual applications, the battery cell 11 can be placed in the accommodating space 213 of the box body 21. The end wall 211 can serve as the bottom wall of the box body 21 and be located at the bottom of the battery cell 11 to support the battery cell 11. Of course, the end wall 211 can also serve as the top wall of the box body 21 and be located above the battery cell 11. In some other embodiments, the end wall 211 can also be located to the side of the battery cell 11. For example, the end wall 211 forms the bottom wall of the box body 21 and can be used to support the battery cell 11.

[0097] The first flange portion 214 is arranged at the end of the side wall 212 away from the end wall 211, that is, the first flange portion 214 is close to the opening of the accommodating space 213. The first flange portion 214 is used to connect the box body 21 with the cover body 22 or other mounting surfaces. After connection, the surface of the first flange portion 214 facing or directly contacting the cover body 22 or other mounting surfaces forms the connecting surface of the first flange portion 214 (that is, the first flange surface 2143 described below).

[0098] It can be understood that the first flange portion 214 is arranged at the end of the side wall 212 away from the end wall 211, which may refer to the first flange portion 214 extending from the end of the side wall 212 away from the end wall 211, or it may refer to the first flange portion 214 only being close to the end of the side wall 212 away from the end wall 211, that is, there may be a small distance between the first flange portion 214 and the end of the side wall 212 away from the end wall 211.

[0099] In some embodiments, as shown in FIG. 5 , the first flange portion 214 may entirely protrude from the inner surface of the sidewall 212 , that is, the first flange portion 214 is formed on the inner surface of the sidewall 212 and protrudes from the inner surface of the sidewall 212 .

[0100] Of course, in other embodiments, as shown in FIG6 , only a portion of the first flange portion 214 may protrude from the inner surface of the side wall 212. For example, the first flange portion 214 may be formed at the end of the side wall 212, and the first flange portion 214 may include a first portion protruding from the outer surface of the side wall 212 and a second portion protruding from the inner surface of the side wall 212. After the first flange portion 214 is connected to the cover 22 or other mounting surface, the partial surface of the first portion and the partial surface of the second portion together form the connection surface of the first flange portion 214 (i.e., the first flange surface 2143 described below).

[0101] The first flange portion 214 can be integrally formed with the side wall 212 of the box body 21 , or can be separately provided with the side wall 212 of the box body 21 and connected to form an integral structure by welding, bonding, riveting, screwing, etc.

[0102] In some embodiments, the first flange portion 214 is integrally formed with the side wall 212 to improve the structural strength of the first flange portion 214 and the entire box body 21 , thereby improving the structural stability of the box body 21 .

[0103] Exemplarily, as shown in FIG. 5 , the first flange portion 214 bends and extends from the end portion of the side wall 212 away from the end wall 211 into the accommodation space 213 , and the first flange portion 214 and the side wall 212 are integrally formed.

[0104] The material of the first flange portion 214 can be the same as the material of the side wall 212, or different from the material of the side wall 212. For example, the end wall 211 and the side wall 212 of the box body 21 can be made of metal materials such as aluminum and alloy. The first flange portion 214 can be made of the same material as the side wall 212, also using metal materials such as aluminum and alloy. This embodiment does not make a unique limitation to this.

[0105] The first flange portion 214 of the side wall 212 of the box body 21 provides a connection surface for the box body 21. Part or all of the first flange portion 214 protrudes from the inner surface of the side wall 212 of the box body 21, so that the first flange portion 214 can share part of the accommodating space 213, reducing the size of the first flange portion 214 extending to the outside of the box body 21 or avoiding the first flange portion 214 extending to the outside of the box body 21, thereby reducing the space outside the box body 21 occupied by the first flange portion 214 or avoiding the first flange portion 214 occupying the space outside the box body 21, and then the space outside the box body 21 originally reserved for the first flange portion 214 can be incorporated into the box body 21 to increase the overall accommodating space 213 of the box body 21, reducing space waste, and improving the energy density and grouping efficiency of the battery 100 using the box body 21.

[0106] In some embodiments, the first flange portion 214 defines a threaded hole 215 .

[0107] As previously mentioned, the first flange portion 214 is used to connect the box body 21 to the cover body 22 or other mounting surface. The threaded holes 215 provided in the first flange portion 214 are used to connect the box body 21 to the cover body 22 or other mounting surface. Specifically, fasteners such as bolts and studs can be inserted into the threaded holes 215 and threadedly connected to the box body 21, thereby connecting the box body to the cover body 22 or other mounting surface.

[0108] The threaded hole 215 may extend axially substantially parallel to the sidewall 212, and the threaded hole 215 may or may not penetrate the first flange portion 214. In some embodiments, the threaded hole 215 does not penetrate the first flange portion 214, i.e., the threaded hole 215 forms a blind hole structure on the first flange portion 214.

[0109] The first flange portion 214 is provided with a threaded hole 215 , which facilitates connecting the box body 21 with other accessories or fixing the box body 21 to a carrier through the threaded hole 215 , thereby facilitating the installation of the box body 21 .

[0110] In some embodiments, referring to FIG. 4 to FIG. 6 , the first flange portion 214 has a first flange surface 2143 facing away from the end wall 211 . The width of the first flange surface 2143 is D, satisfying 10 mm ≤ D ≤ 30 mm.

[0111] As mentioned above, the first flange portion 214 is used to connect the box body 21 with the cover body 22 or other mounting surfaces. After connection, the surface of the first flange portion 214 facing or directly contacting the cover body 22 or other mounting surfaces forms the connecting surface of the first flange portion 214, which is the first flange surface 2143 of the first flange portion 214.

[0112] It is understandable that the plane where the first flange surface 2143 is located intersects with the side wall 212 , and the first flange surface 2143 may be perpendicular to the side wall 212 or may not be perpendicular to the side wall 212 .

[0113] The width of the first flange surface 2143 refers to the distance from one end to the other end of the first flange surface 2143 along a direction perpendicular to the connecting line between the first flange surface 2143 and the side wall 212 and parallel to the first flange surface 2143 (as shown in Figure 5, the side wall is parallel to the Z direction, the first flange surface 2143 is perpendicular to the side wall 212, and the width direction of the first flange surface 2143 extends along the X direction shown in Figure 5).

[0114] The width D of the first flange surface 2143 can be 10 mm, 11 mm, 12 mm, 13 mm, 15 mm, 20 mm, 25 mm, 30 mm, or a value greater than or equal to 10 mm and less than or equal to 30 mm.

[0115] In some embodiments, the width D of the first flange surface 2143 can be 15 mm, 16 mm, 17.5 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, or a value greater than or equal to 15 mm and less than or equal to 25 mm.

[0116] Exemplarily, the width D of the first flange surface 2143 may be 15 mm.

[0117] The side of the first flange portion 214 facing away from the end wall 211 forms a first flange surface 2143 for connection. If the width of the first flange surface 2143 is too small, the width of the connection area provided by the first flange portion 214 is too small, which is not conducive to improving the reliability of the connection or sealing of the case 21. If the width of the first flange surface 2143 is too large, the width of the first flange portion 214 is too large, and the height of the first flange portion 214 protruding from the inner surface of the side wall 212 is also correspondingly large, which may easily block the opening of the accommodating space 213 and hinder the installation of the battery cell 11 into the case 21. Designing the width D of the first flange surface 2143 to be between 10 mm and 30 mm can improve the connection reliability of the first flange surface 2143 while preventing the first flange portion 214 from excessively blocking the opening of the accommodating space 213. This helps fully utilize the space within the case 21 and improves the energy density of the battery 100 using the case 21.

[0118] In some embodiments, the first flange portion 214 has a first flange surface 2143 facing away from the end wall 211, and the first flange portion 214 includes a first sub-portion 2141 and a second sub-portion 2142. The first sub-portion 2141 connects the second sub-portion 2142 and the side wall 212. Along the direction perpendicular to the first flange surface 2143, the thickness of the first sub-portion 2141 is greater than the thickness of the second sub-portion 2142.

[0119] Specifically, as shown in Figures 5 and 6, the first flange portion 214 includes a first sub-portion 2141 and a second sub-portion 2142. The first sub-portion 2141 has a first sub-flange surface facing away from the end wall 211, and the second sub-portion 2142 has a second sub-flange surface facing away from the end wall 211. The first sub-flange surface and the second sub-flange surface together constitute a first flange surface 2143.

[0120] The first sub-portion 2141 connects the second sub-portion 2142 and the side wall 212 , that is, a portion of the first sub-portion 2141 connects to the side wall 212 , and another portion connects to the second sub-portion 2142 . The second sub-portion 2142 and the side wall 212 are connected through the first sub-portion 2141 .

[0121] The first sub-portion 2141 may protrude from the outer surface of the side wall 212 or the inner surface of the side wall 212 , and the second sub-portion 2142 may protrude from the inner surface of the side wall 212 .

[0122] In some embodiments, as shown in FIG. 5 , the first sub-portion 2141 and the second sub-portion 2142 both protrude from the inner surface of the sidewall 212 .

[0123] In other embodiments, as shown in FIG. 6 , the first sub-portion 2141 protrudes from the outer surface of the sidewall 212 , and the second sub-portion 2142 protrudes from the inner surface of the sidewall 212 .

[0124] As shown in FIG5 and FIG6 , the first flange surface 2143 extends in a plane parallel to the X direction. The Z direction is perpendicular to the first flange surface 2143 . Along the Z direction, the thickness of the first sub-portion 2141 is greater than the thickness of the second sub-portion 2142 .

[0125] Exemplarily, as shown in FIG5 and FIG6 , the first flange surface 2143 is perpendicular to the thickness direction of the end wall 211 , and along the thickness direction of the end wall 211 , the thickness of the first sub-portion 2141 is greater than the thickness of the second sub-portion 2142 .

[0126] The first flange portion 214 includes a second sub-portion 2142 and a first sub-portion 2141 having a thickness greater than that of the second sub-portion 2142. The first sub-portion 2141 connects the side wall 212 and the second sub-portion 2142. The first sub-portion 2141 plays a structural reinforcement role by increasing the structural thickness, thereby further improving the structural strength of the first flange portion 214.

[0127] In some embodiments, as shown in FIG. 5 and FIG. 6 , the first sub-portion 2141 is provided with a threaded hole 215 .

[0128] As previously described, the threaded hole 215 provided in the first flange portion 214 is used to connect the housing 21 to the cover 22 or other mounting surface. The axial direction of the threaded hole 215 can extend substantially perpendicular to the first flange surface 2143. The threaded hole 215 may or may not pass through the first sub-portion 2141. In some embodiments, the threaded hole 215 does not pass through the first sub-portion 2141, that is, the threaded hole 215 forms a blind hole structure on the first sub-portion 2141.

[0129] The thickness of the first sub-section 2141 is greater than that of the second sub-section 2142. The threaded hole 215 is provided in the first sub-section 2141, which helps increase the processing depth of the threaded hole 215, thereby improving the connection stability and structural stability of the box 21 after being subjected to stress. Furthermore, the threaded hole 215 is provided in the first sub-section 2141 of the first flange 214, which has a greater thickness, to reduce the impact of the threaded hole 215 on the structural strength of the first flange 214, thereby improving the structural strength and stability of the box 21 itself.

[0130] In some embodiments, referring again to Figures 3 and 4, the side wall 212 includes two first side walls 2121 arranged opposite to each other along a first direction X and two second side walls 2122 arranged opposite to each other along a second direction Y, the first direction X is perpendicular to the second direction Y, and the first flange portion 214 is arranged at an end of the first side wall 2121 away from the end wall 211.

[0131] Specifically, the two first side walls 2121, the two second side walls 2122, and the end wall 211 collectively form a hollow structure with one end open. The two first side walls 2121 are arranged opposite each other along the first direction X, the two second side walls 2122 are arranged opposite each other along the second direction Y, and the thickness direction of the end wall 211 extends along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The entire box body 21 forms a hexahedron structure with one end open.

[0132] Among them, the first flange portion 214 is arranged at the end of the first side wall 2121 away from the end wall 211, that is, the two first side walls 2121 are both provided with a first flange portion 214 at one end away from the end wall 211, and the two first flange portions 214 are arranged on opposite sides of the box body 21 along the first direction X.

[0133] At least a portion of each first flange portion 214 protrudes from the inner surface of the first side wall 2121 connected to the first flange portion 214. In other words, at least portions of the two first flange portions 214 may extend toward each other into the accommodation space 213.

[0134] Part or all of the first flange portion 214 protrudes from the inner surface of the first side wall 2121, which can reduce the occupancy rate of the first flange portion 214 on the external space of the box body 21 in the first direction X, thereby correspondingly increasing the size of the box body 21 in the first direction X. In actual applications, the battery cell 11 installed in the accommodating space 213 and the first flange portion 214 can share part of the space of the box body 21 in the first direction X, thereby improving the energy density and grouping efficiency of the battery 100 using the box body 21.

[0135] In some embodiments, please refer to Figures 3 and 4, and further refer to Figure 7, which is a cross-sectional view of the box body in the BB direction provided in some embodiments of the present application; the box body 21 also includes a second flange portion 216, and the second flange portion 216 extends outward from one end of one of the second side walls 2122 away from the end wall 211.

[0136] It will be appreciated that, similar to the working principle of the first flange portion 214, the second flange portion 216 is used to work together with the first flange portion 214 to connect the housing 21 to the cover 22 or other mounting surface. Specifically, the second flange portion 216 has a second flange surface 2161 facing away from the end wall 211. The second flange surface 2161 and the first flange surface 2143 are both used to connect to the cover 22 or other mounting surface. Exemplarily, the first flange surface 2143 and the second flange surface 2161 are coplanar.

[0137] The end of the second flange portion 216 along the first direction X may or may not be connected to the first flange portion 214. For example, both ends of the second flange portion 216 along the first direction X are connected to two first flange portions 214 arranged opposite to each other along the first direction X.

[0138] The second flange portion 216 is disposed at one end of the second side wall 2122 away from the end wall 211 , and extends from the second side wall 2122 in a direction away from the accommodating space 213 , that is, a portion or all of the second flange portion 216 protrudes from the outer surface of the second side wall 2122 .

[0139] The second flange portion 216 further increases the flange surface area of ​​the housing 21, improving the connection stability and force balance of the housing 21. Furthermore, the second flange portion 216 extends outward to prevent it from blocking the opening of the accommodating space 213, facilitating the installation of the battery 100 and fully utilizing the interior space of the housing 21, thereby increasing the energy density of the battery 100.

[0140] In some embodiments, please continue to refer to Figures 3, 4 and 7. The box body 21 also includes a third flange portion 217, which is arranged at an end of the other second side wall 2122 away from the end wall 211, and at least a portion of the third flange portion 217 protrudes from the inner surface of the other second side wall 2122.

[0141] The third flange 217 functions in a similar manner to the first and second flanges 214, 216. The third flange 217 is used to connect the housing 21 to the cover 22 or another mounting surface, together with the first and second flanges 214, 216. Specifically, the third flange 217 has a third flange surface 2171 facing away from the end wall 211. The third flange surface 2171, the first flange surface 2143, and the second flange surface 2161 are all used to connect to the cover 22 or another mounting surface. Exemplarily, the first flange surface 2143, the second flange surface 2161, and the third flange surface 2171 are coplanar.

[0142] Similar to the structure of the second flange portion 216, the end portion of the third flange portion 217 along the first direction X may or may not be connected to the first flange portion 214. For example, both ends of the third flange portion 217 along the first direction X are respectively connected to two first flange portions 214 arranged opposite to each other along the first direction X.

[0143] The third flange portion 217 is disposed at an end of the second side wall 2122 away from the end wall 211 , and a portion or the entirety of the third flange portion 217 protrudes from the inner surface of the second side wall 2122 connected to the third flange portion 217 .

[0144] Part or all of the third flange portion 217 protrudes from the inner surface of the second side wall 2122, which can reduce the occupancy rate of the third flange portion 217 on the external space in the second direction Y of the box body 21, thereby correspondingly increasing the size of the box body 21 in the second direction Y. In actual applications, the battery cell 11 installed in the accommodating space 213 and the third flange portion 217 can share part of the space of the box body 21 in the second direction Y, which is also beneficial to improving the energy density and grouping efficiency of the battery 100 using the box body 21.

[0145] In some embodiments, as shown in FIG. 3 , the dimension of the end wall 211 in the first direction X is smaller than the dimension in the second direction Y.

[0146] The dimension of the end wall 211 in the first direction X is smaller than its dimension in the second direction Y. That is, the width of the end wall 211 extends along the first direction X, and the length of the end wall 211 extends along the second direction Y. The box body 21 has a hexahedral structure with one end open. If the thickness direction of the end wall 211 (the third direction Z) is used as the height direction of the box body 21, then the width of the box body 21 extends along the first direction X, and the length of the box body 21 extends along the second direction Y.

[0147] The first flange portion 214 is located on both sides of the width direction of the box body 21, and part or all of the first flange portion 214 protrudes from the inner surface of the first side wall 2121, which can reduce the size of the first flange portion 214 extending to the outside of the box body 21 or avoid the first flange portion 214 extending to the outside of the box body 21, thereby reducing the external space occupied by the first flange portion 214 in the width direction of the box body 21, so that the outer space of the box body 21 originally reserved for the first flange portion 214 can be incorporated into the box body 21 to increase the overall accommodating space 213 of the box body 21. When multiple box bodies 21 are arranged side by side along the width direction of the box body 21, the space waste of multiple box body 21 groups can be further reduced, thereby improving the energy density and grouping efficiency of the battery 100 using the box body 21.

[0148] In some embodiments, as shown in FIG. 5 and FIG. 6 , the thickness of the sidewall 212 is T, satisfying 1 mm ≤ T ≤ 6 mm.

[0149] Specifically, the side wall 212 may be a uniform thickness structure, and the thickness of the side wall 212 may be any value greater than 1 mm and less than 6 mm. For example, the thickness T of the side wall 212 may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, etc.

[0150] Of course, the side wall 212 may also be a structure of unequal thickness. The thickness of the maximum portion of the side wall 212 may be less than or equal to 6 mm, and the thickness of the minimum portion of the side wall 212 may be greater than or equal to 1 mm.

[0151] Exemplarily, the side wall 212 is a uniform thickness structure, and the thickness T of the side wall 212 is 3 mm.

[0152] The side walls 212 and the end walls 211 together form an accommodating space 213 with an opening. If the thickness of the side walls 212 is too small, the structural strength of the box body 21 is low and it is easy to deform under stress. If the thickness of the side walls 212 is too large, the side walls 212 will take up more space, which is not conducive to improving the energy density and grouping efficiency of the battery 100. Designing the thickness of the side walls 212 to be between 1 mm and 6 mm can improve the structural strength of the box body 21 and, at the same time, help improve the energy density and grouping efficiency of the battery 100 using the box body 21.

[0153] In some embodiments, as shown in FIG. 5 to FIG. 7 , the maximum height of the box body 21 along a direction perpendicular to the end wall 211 is H1 , satisfying 50 mm ≤ H1 ≤ 300 mm.

[0154] Specifically, if the first flange portion 214 protrudes from the end of the side wall 212 facing away from the end wall 211 in a direction perpendicular to the end wall 211, the maximum height of the box body 21 is the dimension between the end of the first flange portion 214 facing away from the end wall 211 and the end of the end wall 211 facing away from the accommodating space 213.

[0155] If the first flange portion 214 does not protrude from the end of the side wall 212 facing away from the end wall 211 in a direction perpendicular to the end wall 211, the maximum height of the box body 21 is the dimension between the end of the side wall 212 facing away from the end wall 211 and the end of the end wall 211 facing away from the accommodating space 213.

[0156] The maximum height H1 of the box 21 can be any value greater than or equal to 50 mm and less than or equal to 300 mm. For example, H1 can be 50 mm, 60 mm, 80 mm, 100 mm, 120 mm, 150 mm, 200 mm, 250 mm, 285 mm, etc.

[0157] In some embodiments, H1 can be a value greater than or equal to 100 mm and less than or equal to 300 mm. For example, H1 can be 110 mm, 130 mm, 140 mm, 160 mm, 170 mm, 180 mm, 190 mm, 210 mm, 220 mm, 260 mm, 290 mm, etc.

[0158] If the height of the housing 21 is designed to be too small, the accommodation space 213 of the housing 21 will be insufficient to accommodate the battery cells 11, or the size of the battery cells 11 that can be accommodated will be too small, making the manufacturing process of the battery 100 more difficult and hindering the improvement of the energy density of the battery 100 using the housing 21. If the height of the housing 21 is designed to be too large, it will be detrimental to the miniaturization and lightweighting of the housing 21, and there may be a large amount of empty space within the housing 21, which is also detrimental to improving the energy density of the battery 100 using the housing 21. Designing the height of the housing 21 to be between 50 mm and 300 mm is conducive to fully utilizing the space of the housing 21 and improving the energy density of the battery 100 using the housing 21.

[0159] In some embodiments, please refer to FIG. 8 , which is a bottom view of a box provided in some embodiments of the present application; the end wall 211 is provided with a mounting portion 219 for mounting the box 21 on an electrical device.

[0160] The mounting portion 219 is used to mount the box 21 on an electrical device. The mounting portion 219 can have various structures. For example, the mounting portion 219 can be a fastener such as a snap ring or a stud provided on the end wall 211. The mounting portion 219 can also be a mounting hole provided on the end wall 211.

[0161] Depending on the specifications of the battery 100, the mounting requirements and other factors, one or more mounting parts 219 can be provided. For example, multiple columns of mounting parts 219 can be arranged at intervals on the end wall 211, and multiple mounting parts 219 are arranged at intervals in each column to increase the force-bearing area and force balance of the bottom plate, thereby improving the stability and reliability of the battery 100 when mounted on the electrical device.

[0162] The end wall 211 is provided with a mounting portion 219, which facilitates the installation of the box body 21 on the electrical device through the mounting portion 219. At the same time, the mounting portion 219 is provided on the end wall 211, which can reduce the size of the mounting portion 219 extending to the outside of the box body 21, thereby reducing the space occupied by the mounting portion 219 outside the box body 21, which is also beneficial to improving the energy density of the battery 100 using the box body 21.

[0163] In some embodiments, referring again to FIG. 5 and FIG. 6 , a flow channel 2111 for accommodating a heat exchange medium is provided inside the end wall 211 .

[0164] Specifically, the end wall 211 accommodates a heat exchange medium to adjust the temperature of the battery cell 11 installed in the accommodation space 213, and the heat exchange medium is accommodated in the flow channel 2111 provided inside the end wall 211. The heat exchange medium here can be a liquid or a gas, and adjusting the temperature refers to heating or cooling the battery cell 11. In the case of cooling or lowering the temperature of the battery cell 11, the flow channel 2111 of the end wall 211 is used to accommodate a cooling medium to lower the temperature of the battery cell 11. At this time, the end wall 211 can also be called a cooling component, a cooling system or a cooling plate, etc., and the heat exchange medium it accommodates can also be called a cooling medium, more specifically, it can be called a coolant or a cooling gas. In addition, the end wall 211 can also be used to accommodate a heating medium to heat the battery cell 11, and the embodiment is not limited to this. For example, the flow channel 2111 of the end wall 211 accommodates a coolant to cool the battery cell 11.

[0165] The interior of the end wall 211 is provided with a flow channel 2111 for accommodating a heat exchange medium, so that the end wall 211 can regulate the temperature of the battery cell 11 accommodated in the accommodating space 213, which is beneficial to improving the temperature controllability and uniformity of the battery 100; at the same time, the functional integration of the box body 21 is improved, which is beneficial to simplifying the structure of the battery 100 and improving the energy density of the battery 100.

[0166] In some embodiments, referring to FIG. 3 again, the side wall 212 is provided with a hoisting hole 218 for hoisting the box body 21 .

[0167] Specifically, the hanging hole 218 may or may not pass through the side wall 212. The hanging hole 218 may be provided at a position of the side wall 212 corresponding to the end wall 211. In this case, the hanging hole 218 may extend into the end wall 211. Of course, the hanging hole 218 may also be provided at a position of the side wall 212 that is offset from the end wall 211.

[0168] A plurality of lifting holes 218 may be provided, and the plurality of lifting holes 218 may be spaced apart on the side wall 212 to increase the number of lifting points of the battery 100 and improve the force balance of the battery 100 .

[0169] In some embodiments, the side wall 212 includes two first side walls 2121 arranged opposite to each other along the width direction of the box body 21 (the X direction shown in Figure 3), and each first side wall 2121 has a plurality of lifting holes 218 spaced apart along the length direction of the box body 21 (the Y direction shown in Figure 3).

[0170] The side wall 212 is provided with a hoisting hole 218 to facilitate the hoisting and transportation of the box body 21. At the same time, the hoisting hole 218 does not occupy additional space in the length or width direction of the box body 21, which is also beneficial to improving the energy density of the battery 100.

[0171] Please refer to Figures 2 to 8, and further refer to Figures 9 to 12. Figure 9 is a structural schematic diagram of the box assembly provided in some embodiments of the present application; Figure 10 is a partial enlarged view of part E shown in Figure 9; Figure 11 is an exploded view of the box assembly provided in some embodiments of the present application; Figure 12 is a partial enlarged view of part F shown in Figure 11; some embodiments of the present application also provide a box assembly 20, the box assembly 20 includes a box body 21 and a cover body 22, the box body 21 can be the box body 21 described in any of the above embodiments, the cover body 22 is used to cover the opening of the box body 21 and is connected to the first flange portion 214.

[0172] As mentioned above, the cover body 22 is used to cover the opening of the box body 21 and is connected to the first flange portion 214. The cover body 22 can be a flat plate structure, and the cover body 22 covers the open side of the box body 21 so that the box body 21 and the cover body 22 jointly define an assembly space; the cover body 22 can also be a hollow structure with one end open, and the open side of the box body 21 covers the open side of the cover body 22.

[0173] The shape of the cover 22 may or may not match the shape of the box 21. For example, the box 21 may be a hexahedron structure, and the cover 22 may be a rectangular plate structure that matches the opening of the box 21.

[0174] In some embodiments, the cover 22 and the box 21 can be detachably connected by screwing, riveting, snapping, etc. Of course, in some other embodiments, the cover 22 and the box 21 can be supplied separately. After the battery is assembled, the cover 22 and the box 21 can be welded to each other.

[0175] In some embodiments, the cover 22 is riveted or screwed to the first flange portion 214. This facilitates assembly and disassembly, and provides strong connection stability, thereby facilitating grouping of the box assembly 20.

[0176] The box assembly 20 includes a box body 21 and a cover body 22 . The cover body 22 is connected to the first flange portion 214 , so that the cover body 22 can close the opening of the accommodating space 213 , isolate the accommodating space 213 from the external environment, and improve the sealing performance of the box body 21 .

[0177] In some embodiments, as shown in Figures 9 to 12, the cover 22 includes a body 221 and a flange portion 222. The body 221 is used to cover the opening and is connected to the first flange portion 214. The body 221 has a first surface 223 facing the opening. The flange portion 222 extends from the edge of the body 221 toward the end wall 211 and is configured to cover at least a portion of the outer surface of the side wall 212.

[0178] Specifically, the flange portion 222 can extend a certain length toward the end wall 211. When the cover 22 is closed on the box body 21, the flange portion 222 can only cover a portion of the outer surface of the side wall 212. Of course, the flange portion 222 can also extend toward the end wall 211 all the way to the end wall 211 or beyond the end wall 211. When the cover 22 is closed on the box body 21, the flange portion 222 can completely cover the side wall 212.

[0179] In addition, a single flange portion 222 may be provided, and the flange portion 222 may extend along the circumference of the body 221 to form a closed loop structure. Of course, the flange portion 222 may also be formed only on a portion of the edge of the body 221, that is, the flange portion 222 does not extend along the circumference of the body 221 to form a closed loop structure. Alternatively, a plurality of flange portions 222 may be provided, and the plurality of flange portions 222 may be spaced apart along the circumference of the body 221. The lengths of the plurality of flange portions 222 extending toward the end wall 211 may be the same or different.

[0180] The cover body 22 includes a main body 221 covering the opening of the box body 21 and a flange portion 222 extending from the edge of the main body 221. The flange portion 222 extends in a direction close to the end wall 211. After the cover body 22 is covered on the opening of the box body 21, the flange portion 222 can at least partially cover the outer surface of the side wall 212 of the box body 21. The flange portion 222 plays a guiding and auxiliary sealing role in the mutual covering of the box body 21 and the cover body 22.

[0181] In some embodiments, a groove 2123 is provided on the outer surface of the side wall 212 , and the flange portion 222 is at least partially accommodated in the groove 2123 .

[0182] Specifically, all positions of the outer surface of the side wall 212 corresponding to the flange portion 222 may be provided with grooves 2123 , and the grooves 2123 may extend to an end of the side wall 212 facing the first surface 223 .

[0183] The flange portion 222 may be entirely or partially accommodated within the groove 2123. Specifically, the depth of the groove 2123 may be greater than the thickness of the flange portion 222. After the flange portion 222 is accommodated within the groove 2123, the flange portion 222 does not protrude from the outer surface of the sidewall 212. Of course, the depth of the groove 2123 may also be less than the thickness of the flange portion 222. After the flange portion 222 is accommodated within the groove 2123, the side of the flange portion 222 facing away from the sidewall 212 protrudes from the outer surface of the sidewall 212.

[0184] Exemplarily, the depth of the groove 2123 is greater than the thickness of the flange portion 222 . After the flange portion 222 is accommodated in the groove 2123 , the flange portion 222 does not protrude from the outer surface of the side wall 212 .

[0185] In addition, the groove 2123 may not be set at the position corresponding to the outer surface of the side wall 212 and the part of the flange portion 222. In this way, along the circumference of the main body 221, the part of the flange portion 222 can be accommodated in the groove 2123 corresponding to its position, while the groove 2123 is not set at the position corresponding to the part of the flange portion 222, and the part of the flange portion 222 cannot be placed in the groove 2123.

[0186] The outer surface of the side wall 212 is provided with a groove 2123, and part or all of the flange portion 222 is accommodated in the groove 2123. The setting of the groove 2123 can reduce the size of the flange portion 222 protruding from the outer surface of the side wall 212 or avoid the flange portion 222 protruding from the outer surface of the side wall 212, thereby reducing the external space of the box body 21 occupied by the flange portion 222 alone or avoiding the external space of the box body 21 occupied by the flange portion 222 alone. The flange portion 222 and the side wall 212 share part of the horizontal space of the box body 21, which is conducive to further improving the energy density and grouping efficiency of the battery 100 using the box body 21.

[0187] In some embodiments, as shown in Figures 9 to 12, the side wall 212 includes two first side walls 2121 arranged opposite to each other along a first direction X and two second side walls 2122 arranged opposite to each other along a second direction Y, the first direction X is perpendicular to the second direction Y, the first flange portion 214 is arranged at an end of the first side wall 2121 away from the end wall 211; the groove 2123 is arranged on the outer surface of the first side wall 2121.

[0188] Specifically, the two first side walls 2121, the two second side walls 2122, and the end wall 211 collectively form a hollow structure with one end open. The two first side walls 2121 are disposed opposite each other along a first direction X, and the two second side walls 2122 are disposed opposite each other along a second direction Y. The first direction X, the second direction Y, and the thickness direction of the end walls 211 are perpendicular to each other. The entire box body 21 forms a hexahedral structure with one end open.

[0189] Among them, the first flange portion 214 is arranged at the end of the first side wall 2121 away from the end wall 211, that is, two first flange portions 214 can be set, and the two first side walls 2121 are both provided with a first flange portion 214 at one end away from the end wall 211, and the two first flange portions 214 are arranged on opposite sides of the box body 21 along the first direction X.

[0190] At the same time, a groove 2123 is provided on the outer surface of each first side wall 2121 , so that the flange portion 222 covering the outer surface of the first side wall 2121 can be accommodated in the groove 2123 .

[0191] The flange portion 222 and the first side wall 2121 share part of the space of the box body 21 along the first direction X. This helps the battery cells 11 fully utilize the space of the box body 21 in the first direction X, thereby improving the energy density and assembly efficiency of the battery 100 using the box body 21 .

[0192] In some embodiments, as shown in FIG. 11 and FIG. 12 , the maximum height of the cover 22 along a direction perpendicular to the end wall 211 is H2 , satisfying H2 ≤ 10 mm.

[0193] Specifically, the maximum height of the cover body 22 refers to the minimum straight-line distance between the position of the cover body 22 farthest from the end wall 211 and the position of the cover body 22 closest to the end wall 211 along the direction perpendicular to the end wall 211 (Z direction shown in Figure 11).

[0194] For example, based on the implementation form of "the cover body 22 includes a main body 221 and a flange portion 222", the maximum height H2 of the cover body 22 refers to: along the direction perpendicular to the end wall 211 (Z direction), the distance between the end of the main body 221 facing away from the end wall 211 and the end of the flange portion 222 facing the end wall 211.

[0195] The maximum height H2 of the cover 22 can be 10 mm, 9 mm, 8 mm, 7 mm, 6 mm, 5 mm, 4 mm, 3 mm, 2 mm, 1 mm, or any other value less than or equal to 10 mm.

[0196] The greater the height of the cover 22, the more space it occupies, and the more serious the space waste of the battery 100 using the box 21. Designing the maximum height of the cover 22 to be within 10 mm can reduce the space waste of the cover 22 on the box 21, thereby improving the energy density and grouping efficiency of the battery 100 using the box 21.

[0197] In some embodiments, as shown in FIG. 11 , the box assembly 20 further includes a sealing member 23 , at least a portion of which is disposed between the cover 22 and the first flange portion 214 .

[0198] The seal 23 can be implemented in various forms. For example, the seal 23 can be a separately provided sealing ring structure, which is embedded between the first flange portion 214 and the cover body 22 to achieve a sealed connection between the cover body 22 and the box body 21.

[0199] For another example, the sealing member 23 may be a sealant layer. The sealant is applied between the first flange portion 214 and the cover 22 to form a sealant layer, which realizes a sealed connection between the cover 22 and the box body 21 .

[0200] A seal 23 is provided between the cover 22 and the first flange portion 214 of the box 21 to achieve a sealed connection between the cover 22 and the box 21 , which is beneficial to improving the sealing performance of the battery 100 after assembly.

[0201] Some embodiments of the present application further provide a battery 100 comprising a plurality of battery cells 11 and a box assembly 20 . The box assembly 20 may be the box assembly 20 described in any of the above schemes. The plurality of battery cells 11 are disposed in the accommodating space 213 of the box assembly 20 .

[0202] As previously mentioned, the multiple battery cells 11 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections within the multiple battery cells 11. The multiple battery cells 11 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery module 10 is housed within the housing assembly 20. Alternatively, the multiple battery cells 11 can be first connected in series, in parallel, or in a hybrid connection to form a battery module 10, and then the multiple battery modules 10 are further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing assembly 20.

[0203] In some embodiments, referring to FIG3 and further to FIG13 , which is a cross-sectional schematic diagram of a battery module installed within a housing according to some embodiments of the present application, a plurality of battery cells 11 form a battery module 10 , with at least three battery modules 10 arranged side by side parallel to the end wall 211 .

[0204] Specifically, at least three battery modules 10 are arranged in the receiving space 213 along a direction parallel to the end wall 211 . That is, three, four, or even more battery modules 10 may be arranged in the receiving space 213 along a direction parallel to the end wall 211 .

[0205] Exemplarily, as shown in Figures 11 and 13, the box body 21 includes an end wall 211, a side wall 212 and a first flange portion 214, the side wall 212 is arranged around the end wall 211, and the side wall 212 and the end wall 211 together form a accommodating space 213 with an opening, the side wall 212 includes two first side walls 2121 arranged opposite to each other along a first direction X and two second side walls 2122 arranged opposite to each other along a second direction Y, the first direction X is perpendicular to the second direction Y, the first flange portion 214 is arranged at one end of the first side wall 2121 away from the end wall 211, and at least part of the first flange portion 214 protrudes from the inner surface of the first side wall 2121.

[0206] Along the first direction X, three battery modules 10 are arranged in the accommodation space 213 .

[0207] When installing the battery module 10 into the box body 21, the battery module 10 can be pushed into the box body 21 by side push. Specifically, the first battery module 10 can be moved into the box body 21 along a direction perpendicular to the end wall 211 (Z direction) so that the battery module 10 enters the accommodating space 213, and then the battery module 10 entering the accommodating space 213 is moved along the first direction X so that the first battery module 10 is close to a first side wall 2121, and a portion of the battery module 10 can be located below the first flange portion 214 connected to the first side wall 2121. Then, the second battery module 10 is loaded into the box body 21 in the same manner as the first battery module 10, and the second battery module 10 is placed close to the second first side wall 2121. Part of the battery module 10 can be located below the first flange portion 214 connected to the first side wall 2121. Then, the third battery module 10 is moved in a direction perpendicular to the end wall 211 (Z direction) and loaded between the first battery module 10 and the second battery module 10.

[0208] At least three battery modules 10 are arranged side by side in the accommodating space 213 in a direction parallel to the end wall 211, that is, the opening size of the accommodating space 213 is much larger than the size of the battery module 10. When the battery module 10 is installed into the box body 21, it can avoid each other with the box body 21, reducing the possibility of the first flange portion 214 interfering with the installation of the battery module 10, making it convenient to fully utilize the accommodating space 213 of the box body 21, reducing space waste in the box body 21, and also helping to improve the energy density and grouping efficiency of the battery 100 using the box body 21.

[0209] In some embodiments, as shown in FIG. 13 , when viewed in a direction perpendicular to the end wall 211 , the first flange portion 214 and at least a portion of the battery cells 11 have overlapping areas.

[0210] That is to say, after the battery cell 11 is installed into the box body 21, part of the battery cell 11 and the first flange portion 214 can share part of the space of the box body 21 in the direction parallel to the end wall 211, further improving the space occupancy rate of the battery cell 11 in the accommodating space 213 of the box body 21, reducing the space waste of the accommodating space 213 located below the first flange portion 214, and improving the energy density and grouping efficiency of the battery 100 using the box body 21.

[0211] Some embodiments of the present application further provide an electrical device, comprising the battery 100 described in any of the above solutions, wherein the battery 100 is used to provide electrical energy.

[0212] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0213] Referring to Figures 3 to 8 , some embodiments of the present application provide a box assembly 20 comprising a box body 21 and a cover body 22. The box body 21 includes an end wall 211, a side wall 212, a first flange 214, a second flange 216, and a third flange 217. The side wall 212 surrounds the end wall 211, and the side wall 212 and the end wall 211 together define an opening accommodating space 213. The side wall 212 includes two first side walls 2121 disposed opposite each other along a first direction X, and two second side walls 2122 disposed opposite each other along a second direction Y. The first direction X, the second direction Y, and the thickness direction of the end wall 211 (the third direction Z) are perpendicular to each other. The dimension of the end wall 211 in the first direction X is smaller than its dimension in the second direction Y. The first flange 214 is disposed at an end of the first side wall 2121 distal from the end wall 211, with at least a portion of the first flange 214 protruding from the inner surface of the first side wall 2121. The second flange portion 216 extends outward from one end of one of the second side walls 2122 away from the end wall 211, and the third flange portion 217 is arranged at the end of the other second side wall 2122 away from the end wall 211, and at least a portion of the third flange portion 217 protrudes from the inner surface of the other second side wall 2122.

[0214] The first flange portion 214 has a first flange surface 2143 facing away from the end wall 211. The first flange portion 214 includes a first sub-portion 2141 and a second sub-portion 2142. The first sub-portion 2141 connects the second sub-portion 2142 and the side wall 212. In a direction perpendicular to the first flange surface 2143, the thickness of the first sub-portion 2141 is greater than that of the second sub-portion 2142. The first sub-portion 2141 is defined by a threaded hole 215.

[0215] The cover 22 is used to cover the opening and is threadedly connected to the first flange portion 214. The cover 22 includes a body 221 and a flange portion 222. The body 221 is used to cover the opening and is connected to the first flange portion 214. The body 221 has a first surface 223 facing the opening. The flange portion 222 extends from the edge of the body 221 toward the end wall 211 and is configured to cover at least a portion of the outer surface of the side wall 212. The outer surface of the first side wall 2121 is provided with a groove 2123, and the flange portion 222 is at least partially accommodated in the groove 2123.

[0216] Referring to Figures 3 to 13, some embodiments of the present application provide a battery 100 comprising a housing assembly 20 and a plurality of battery cells 11. The housing assembly 20 comprises a housing 21 and a cover 22. The housing 21 comprises an end wall 211, a side wall 212, a first flange portion 214, a second flange portion 216, and a third flange portion 217. The side wall 212 surrounds the end wall 211, and the side wall 212 and the end wall 211 together define a receiving space 213 having an opening. The side wall 212 comprises two first side walls 2121 disposed opposite each other along a first direction X, and two second side walls 2122 disposed opposite each other along a second direction Y. The first direction X, the second direction Y, and the thickness direction of the end wall 211 (the third direction Z) are perpendicular to each other. The dimension of the end wall 211 in the first direction X is smaller than the dimension in the second direction Y. The first flange portion 214 is disposed at an end of the first side wall 2121 away from the end wall 211, and at least a portion of the first flange portion 214 protrudes from the inner surface of the first side wall 2121. The second flange portion 216 extends outward from an end of one of the second side walls 2122 away from the end wall 211. The third flange portion 217 is disposed at an end of the other second side wall 2122 away from the end wall 211, and at least a portion of the third flange portion 217 protrudes from the inner surface of the other second side wall 2122.

[0217] The first flange portion 214 has a first flange surface 2143 facing away from the end wall 211. The first flange portion 214 includes a first sub-portion 2141 and a second sub-portion 2142. The first sub-portion 2141 connects the second sub-portion 2142 and the side wall 212. In a direction perpendicular to the first flange surface 2143, the thickness of the first sub-portion 2141 is greater than that of the second sub-portion 2142. The first sub-portion 2141 is defined by a threaded hole 215.

[0218] The cover 22 is used to cover the opening and is threadedly connected to the first flange portion 214. The cover 22 includes a body 221 and a flange portion 222. The body 221 is used to cover the opening and is connected to the first flange portion 214. The body 221 has a first surface 223 facing the opening. The flange portion 222 extends from the edge of the body 221 toward the end wall 211 and is configured to cover at least a portion of the outer surface of the side wall 212. The outer surface of the first side wall 2121 is provided with a groove 2123, and the flange portion 222 is at least partially accommodated in the groove 2123.

[0219] Multiple battery cells 11 are first connected in series, parallel, or in series to form a battery module 10. The multiple battery modules 10 are then connected in series, parallel, or in series to form a single unit and housed within the housing assembly 20. Along the first direction X, three battery modules 10 are arranged within the housing space 213. When viewed perpendicular to the end wall 211, the first flange 214 overlaps with at least a portion of the battery cells 11 in the battery module 10.

[0220] When assembling the battery 100, the battery modules 10 can be pushed into the housing 21 using a side-pushing method. Specifically, the first battery module 10 can be first moved into the housing 21 in a direction perpendicular to the end wall 211 so that the battery module 10 enters the accommodating space 213. The battery module 10 in the accommodating space 213 is then moved in a first direction X so that the first battery module 10 approaches a first side wall 2121, with a portion of the battery module 10 positioned below the first flange 214 of the first side wall 2121. The second battery module 10 is then inserted into the housing 21 in the same manner as the first battery module 10, and the second battery module 10 approaches a second first side wall 2121, with a portion of the battery module 10 positioned below the first flange 214 of the first side wall 2121. The third battery module 10 is then installed into the accommodating space 213 in a direction perpendicular to the end wall 211, positioned between the first and second battery modules 10. Finally, the cover 22 is placed on the box body 21 , and the main body 221 of the cover 22 is connected to the first flange portion 214 , the second flange portion 216 and the third flange portion 217 .

[0221] In some embodiments, before connecting the cover body 22 and the box body 21, a seal 23 (sealing ring or sealant) can be arranged on the first flange portion 214, the second flange portion 216 and the third flange portion 217, and finally the cover body 22 is installed. The seal 23 enables the cover body 22 and the box body 21 to be sealed and connected.

[0222] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A box, comprising: end wall; a side wall, the side wall being arranged around the end wall, the side wall and the end wall together forming a receiving space with an opening; A first flange portion is provided at an end of the side wall away from the end wall, and at least a portion of the first flange portion protrudes from an inner surface of the side wall.

2. The box according to claim 1, wherein: The first flange portion and the side wall are integrally formed.

3. The box according to claim 1 or 2, wherein: The first flange portion is provided with a threaded hole.

4. The box according to any one of claims 1 to 3, wherein: The first flange portion has a first flange surface facing away from the end wall. The width of the first flange surface is D, which satisfies 10 mm ≤ D ≤ 30 mm.

5. The box according to any one of claims 1 to 4, wherein: The first flange portion has a first flange surface facing away from the end wall. The first flange portion includes a first sub-portion and a second sub-portion. The first sub-portion connects the second sub-portion and the side wall. Along a direction perpendicular to the first flange surface, the thickness of the first sub-portion is greater than the thickness of the second sub-portion.

6. The box according to claim 5, wherein: The first sub-portion is provided with a threaded hole.

7. The box according to any one of claims 1 to 6, wherein: The side wall includes two first side walls arranged opposite to each other along a first direction and two second side walls arranged opposite to each other along a second direction, the first direction is perpendicular to the second direction, and the first flange portion is arranged at an end of the first side wall away from the end wall.

8. The box according to claim 7, wherein: The box also includes: A second flange portion extends outward from an end of one of the second side walls away from the end wall.

9. The box according to claim 8, wherein: The box also includes: A third flange portion is provided at an end of the other second side wall away from the end wall, and at least a portion of the third flange portion protrudes from an inner surface of the other second side wall.

10. The box according to any one of claims 7 to 9, wherein: The dimension of the end wall in the first direction is smaller than the dimension in the second direction.

11. The box according to any one of claims 1 to 10, wherein: The thickness of the side wall is T, which satisfies 1mm≤T≤6mm.

12. The box according to any one of claims 1 to 11, wherein: Along the direction perpendicular to the end wall, the maximum height of the box body is H1, which satisfies 50mm≤H1≤300mm.

13. The box according to any one of claims 1 to 12, wherein: The end wall is provided with a mounting portion for mounting the box on an electrical device.

14. The box according to any one of claims 1 to 13, wherein: A flow channel for accommodating a heat exchange medium is provided inside the end wall.

15. The box according to any one of claims 1 to 14, wherein: The side wall is provided with a hoisting hole for hoisting the box body.

16. A box assembly comprising: The box according to any one of claims 1 to 15; A cover body is used to cover the opening and is connected to the first flange portion.

17. The box assembly according to claim 16, wherein: The cover body comprises: a body, used to cover the opening and connected to the first flange portion, the body having a first surface facing the opening; The flange portion extends from the edge of the body toward the end wall, and the flange portion is configured to cover at least a portion of the outer surface of the side wall.

18. The box assembly according to claim 17, wherein: The outer surface of the side wall is provided with a groove, and the flange portion is at least partially accommodated in the groove.

19. The box assembly according to claim 18, wherein: The side wall includes two first side walls arranged opposite to each other along a first direction and two second side walls arranged opposite to each other along a second direction, the first direction is perpendicular to the second direction, and the first flange portion is arranged at an end of the first side wall away from the end wall; The groove is arranged on the outer surface of the first side wall.

20. The box assembly according to any one of claims 16 to 19, wherein: Along a direction perpendicular to the end wall, the maximum height of the cover body is H2, satisfying H2≤10mm.

21. The box assembly according to any one of claims 16 to 20, wherein: The cover body is riveted or screwed to the first flange portion.

22. The box assembly according to any one of claims 16 to 21, wherein: The box assembly further includes a sealing member, at least a portion of which is disposed between the cover and the first flange portion.

23. A battery comprising: The box assembly according to any one of claims 16 to 22; A plurality of battery cells are arranged in the accommodation space.

24. The battery according to claim 23, wherein The plurality of battery cells form a battery module, and at least three of the battery modules are arranged side by side in a direction parallel to the end wall.

25. The battery according to claim 23 or 24, wherein When viewed in a direction perpendicular to the end wall, the first flange portion has an overlapping area with at least a portion of the plurality of battery cells.

26. An electrical device comprising the battery according to any one of claims 23 to 25, wherein the battery is used to provide electrical energy.

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