Battery device, power consuming device, and method for manufacturing battery device

Abstract

The application belongs to the technical field of batteries, and provides a battery device, a power consumption device and a preparation method of the battery device. The battery device comprises a battery monomer assembly, a box assembly, a positioning structure and a edge covering structure. The box assembly comprises a first box and a second box. The first box and the second box jointly enclose a containing cavity. The battery monomer assembly is contained in the containing cavity. The positioning structure is connected to the first box. The edge covering structure is connected to the second box. The second direction is perpendicular to the first direction. In the second direction, the box assembly has a first side and a second side. The first side and the second side of the first box are both connected to the positioning structure. The first side and the second side of the second box are both connected to the edge covering structure. The second box is heat treated to be able to shrink in the second direction. In the second direction, the edge covering structure is moved towards the positioning structure to be inserted with the positioning structure. The application can improve the assembly efficiency between the first box and the second box.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, an electrical device, and a method for preparing the battery device. Background Technology

[0002] In the field of battery technology, the housing assembly of a battery device is typically composed of two parts combined to form a space for accommodating individual battery cells.

[0003] In related technologies, the two housing parts in a housing assembly are often fixed together using fasteners such as bolts. However, using bolts for fixing has many drawbacks. During installation, each bolt needs to be tightened individually, which is not only time-consuming and labor-intensive, but also cumbersome and reduces the assembly efficiency of the battery device. Summary of the Invention

[0004] The purpose of this application is to provide a battery device, an electrical device, and a method for manufacturing the battery device, aiming to solve the technical problems of the assembly of the first and second housings in the battery device relying on fasteners and the cumbersome assembly process.

[0005] In a first aspect, this application provides a battery device, comprising:

[0006] Battery cell assembly;

[0007] The housing assembly includes a first housing and a second housing, the first housing and the second housing being arranged opposite to each other in a first direction and jointly enclosing a receiving cavity, and the battery cell assembly being housed in the receiving cavity;

[0008] A positioning structure is attached to the first housing.

[0009] The edge-sealing structure is connected to the second housing. Along the second direction, the positioning structure is inserted into the edge-sealing structure. The second direction is perpendicular to the first direction.

[0010] In the second direction, the housing assembly has a first side and a second side opposite to each other. The first side and the second side of the first housing are both connected to positioning structures. Correspondingly, the first side and the second side of the second housing are both connected to edge-wrapping structures. Each positioning structure is inserted into each edge-wrapping structure in the second direction to restrict the movement of the edge-wrapping structure relative to the positioning structure in the first and second directions. The second housing is heat-treated to shrink in the second direction, so that the edge-wrapping structure moves toward the positioning structure to be inserted into the positioning structure. The edge-wrapping structures located on the first side and the second side apply opposing forces to the positioning structure in the second direction.

[0011] In this embodiment, the first and second housings can be connected and assembled through the interlocking of the positioning structure on the first housing and the edge-wrapping structure on the second housing, without the need for fasteners, which simplifies the assembly operation and improves assembly efficiency. The interlocking structures on both sides can jointly withstand the external force, limiting the relative displacement of the first and second housings in the second direction, improving the overall stability of the housing assembly structure, and thus better protecting the internal battery cell assembly. The heat treatment of the second housing achieves the purpose of connecting the positioning structure and the edge-wrapping structure, making the connection between the first and second housings more convenient and improving the reliability of the connection.

[0012] In one embodiment, the positioning structure protrudes from the side wall of the first housing along the second direction, and the edge-sealing structure has a snap-fit ​​groove, into which the positioning structure is inserted.

[0013] In this embodiment, the insertion and engagement of the positioning structure and the snap-fit ​​groove make the connection between the two more compact and reliable, further enhancing the connection stability between the first housing and the second housing.

[0014] In one embodiment, the first housing has a receiving groove with a depth extending along a first direction, and the second housing covers the opening of the receiving groove to form a receiving cavity; the positioning structure is disposed on the outer edge of the opening and protrudes along a second direction toward a direction away from the opening.

[0015] In this embodiment, the positioning structure is arranged at the opening of the receiving groove, which facilitates the assembly of the edge-wrapping structure with it. After the edge-wrapping structure is inserted with the positioning structure, it can provide better support and positioning for the second box, further reducing the risk of displacement of the second box in the first and second directions, and ensuring the overall structural stability of the box assembly.

[0016] In one embodiment, the first housing has a first housing wall on a first side, and the positioning structure is connected to the first housing wall and extends continuously along the wall surface of the first housing wall; and / or,

[0017] The first box has a second box wall on the second side, and the positioning structure is connected to the second box wall and extends continuously along the wall surface of the second box wall.

[0018] In this embodiment, the positioning structure extends continuously to form a raised strip structure. The raised structure is interlocked with the edge-sealing structure, which can increase the length and area of ​​the interlocking limit, thus improving the reliability of the limit on the first and second boxes.

[0019] In one embodiment, the first housing has a first housing wall on a first side, and positioning structures are connected to the first housing wall and are discontinuously distributed along the wall surface of the first housing wall; and / or

[0020] The first box has a second box wall on the second side, and the positioning structure is connected to the second box wall and is distributed intermittently along the wall surface of the second box wall.

[0021] In this embodiment, the intermittent positioning structure can further reduce the weight of the positioning structure while ensuring connection reliability, which is beneficial to the lightweighting of the battery device.

[0022] In one embodiment, the edging structure includes a first edging body and a second edging body connected to each other. The first edging body extends along a first direction, one end of the first edging body is connected to a second housing, and the other end of the first edging body is connected to the second edging body. The second edging body and the first edging body are arranged at a preset angle, and the second edging body extends toward the middle area of ​​the second housing, so that the first edging body, the second edging body and the second housing together form a snap-fit ​​groove; the positioning structure is inserted into the snap-fit ​​groove.

[0023] In this embodiment, the structure in which the first and second edging bodies are connected has high stability, is simple in structure, easy to manufacture, and not prone to deformation, which helps to improve the connection reliability between the edging structure and the positioning structure.

[0024] In one embodiment, the preset included angle is 90°, and along the second direction, the second edging body has a first preset width, which ranges from 1mm to 100mm.

[0025] In this embodiment, the preset included angle is set to 90°, which makes the first and second edging bodies perpendicular to each other, facilitating the fit and connection between the second edging body and the surface of the positioning body, and improving the reliability of the connection.

[0026] In one embodiment, the first housing also has a limiting groove, and the second edging body is inserted into the limiting groove.

[0027] In this embodiment, by setting a limiting groove, the edge-wrapping structure can be further limited, thereby improving the reliability and stability of the connection between the positioning structure and the edge-wrapping structure.

[0028] In one embodiment, the second housing has a third housing wall on the first side, and an edge-sealing structure is connected to the third housing wall and extends continuously along the wall surface of the third housing wall; and / or

[0029] The second box has a fourth box wall on the second side, and the edging structure is connected to the fourth box wall and extends continuously along the wall surface of the fourth box wall.

[0030] In this embodiment, the edge-binding structure extends continuously to form a strip structure. The strip structure is interlocked with the positioning structure, which increases the length and area of ​​the interlocking limit, thus improving the reliability of the limit on the first and second boxes.

[0031] In one embodiment, the second housing has a third housing wall on the first side, and the edging structure is connected to the third housing wall and is discontinuously distributed along the wall surface of the third housing wall; and / or

[0032] The second box has a fourth box wall on the second side, and the edging structure is connected to the fourth box wall and is distributed intermittently along the wall surface of the fourth box wall.

[0033] In this embodiment, the intermittent edge-wrapping structure can further reduce the weight of the positioning structure while ensuring connection reliability, which is beneficial to the lightweighting of the battery device.

[0034] In one embodiment, the positioning structure and the edge-binding structure are interference-fitted.

[0035] In this embodiment, the positioning structure and the edge-wrapping structure are connected by an interference fit, which can reduce the risk of loosening between the positioning structure and the edge-wrapping structure and improve the reliability of their connection.

[0036] In one embodiment, the second enclosure is made of aluminum alloy or carbon steel.

[0037] In this embodiment, aluminum alloy or carbon steel is selected to prepare the second box. The thermal expansion and contraction properties of the material can be used to achieve the purpose of interlocking and positioning between the positioning structure and the edge-wrapping structure, thereby improving the convenience of connection.

[0038] In one embodiment, in the third direction, the housing assembly has opposing third and fourth sides, with the first, second, and third directions mutually perpendicular to each other; the third side of the first housing is fixedly or detachably connected to the third side of the second housing; and / or

[0039] The fourth side of the first housing is fixedly or detachably connected to the fourth side of the second housing.

[0040] In this embodiment, by adding connections and fixation between the first housing and the second housing on the third side and the fourth side, the reliability of the connection between the first housing and the second housing can be further improved.

[0041] In one embodiment, the positioning structure is integrally formed onto the first housing; and / or

[0042] The edge-sealing structure is integrally molded onto the second housing.

[0043] In this embodiment, the integrated molding design of the positioning structure with the first box and the edge-wrapping structure with the second box can ensure structural strength and stability, improve production efficiency, reduce costs and extend service life.

[0044] Secondly, this application provides an electrical device, including a battery device as described in any of the above, the battery device being used to store or provide electrical energy.

[0045] Secondly, this application provides a method for manufacturing a battery device, the method being applied to a battery device as described in any of the above claims, the method comprising:

[0046] The second housing is subjected to a first heat treatment, causing the second housing to expand at least in the second direction;

[0047] The second box is pre-assembled with the first box;

[0048] The second housing undergoes a second heat treatment, causing it to shrink at least in the second direction, and the edging structure moves toward the positioning structure to interlock with it.

[0049] In this embodiment, the second housing is heat-treated to allow it to expand and contract in at least the second direction, thereby enabling the positioning structure and the edge-sealing structure to fit together. This makes the assembly between the first housing and the second housing more convenient, eliminating the need for fasteners, simplifying the assembly process and improving assembly efficiency.

[0050] In one embodiment, the second housing has a second preset width along the second direction; the edging structure includes a first edging body and a second edging body connected together, the first edging body extending along the first direction, one end of the first edging body being connected to the second housing, the other end of the second edging body being connected to the second edging body, the second edging body being arranged at a 90° angle to the first edging body, and the second edging body extending towards the central region of the second housing with a first preset width; the ratio of the first preset width to the second preset width is greater than 0 and less than or equal to 2.3 × 10⁻³.

[0051] In this embodiment, by limiting the ratio of the width of the second edging body to the width of the second box body, the problem of interference between the positioning structure and the edging structure is not easily achieved when the first box body and the second box body are pre-assembled. In addition, the reliability of the connection between the positioning structure and the edging structure can also be guaranteed.

[0052] In one embodiment, the temperature difference between the first heat treatment and the second heat treatment is 150°C-250°C.

[0053] In this embodiment, the temperature difference between the first heat treatment and the second heat treatment is 150℃-250℃, which can ensure the reliable cooperation between the positioning structure and the edge-wrapping structure.

[0054] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0055] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0057] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0058] Figure 3 Front view of a battery device provided for some embodiments of this application;

[0059] Figure 4 for Figure 3 AA section view;

[0060] Figure 5 for Figure 4 A magnified view of position C;

[0061] Figure 6 for Figure 4 A magnified view of a portion of the area at position D;

[0062] Figure 7 A partial schematic diagram showing the relative position between the second housing and the first housing in a battery device provided in some embodiments of this application after undergoing a first heat treatment;

[0063] Figure 8 A partial schematic diagram showing the relative position between the second housing and the first housing in a battery device provided in some embodiments of this application after undergoing a second heat treatment;

[0064] Figure 9 for Figure 3 Axonometric Figure 1 ;

[0065] Figure 10 for Figure 9 A magnified view at position E in the middle Figure 1 ;

[0066] Figure 11 for Figure 9 A magnified view at position E in the middle Figure 2 ;

[0067] Figure 12 for Figure 3 A bottom view;

[0068] Figure 13 for Figure 12 A magnified view of position F;

[0069] Figure 14 for Figure 3 Axonometric Figure 2 ;

[0070] Figure 15 for Figure 3 Axonometric Figure 3 ;

[0071] Figure 16 for Figure 15 A magnified view of the area at position G;

[0072] Figure 17 for Figure 15 A schematic diagram of the structure in which the center positioning structure and the edge-wrapping structure work together;

[0073] Figure 18 for Figure 3 BB cross-sectional view;

[0074] Figure 19 for Figure 18 A magnified view of the area at position H in the middle;

[0075] Figure 20 This is a schematic flowchart illustrating the preparation method of a battery device provided in some embodiments of this application.

[0076] Explanation of reference numerals in the attached figures:

[0077] 1000, Vehicle; 1100, Battery assembly; 1110, Housing assembly; 1111, First housing; 11111, First housing wall; 11112, Second housing wall; 1112, Second housing; 11121, Third housing wall; 11122, Fourth housing wall; 1113, Receiving cavity; 1114, First side; 1115, Second side; 1116, Third side; 1117, Fourth side; 1120, Electricity Battery cell assembly; 1121, battery cell; 1130, positioning structure; 1131, limiting groove; 1140, edge-wrapping structure; 1141, first edge-wrapping body; 1142, second edge-wrapping body; 1143, snap-fit ​​groove; 1150, bonding structure; 1200, controller; 1300, motor; X, first direction; Y, second direction; Z, third direction; L1, first preset width; L2, second preset width. Detailed Implementation

[0078] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0080] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0081] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0082] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

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

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

[0085] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0086] With the rapid development of the new energy industry, battery technologies (such as lithium-ion batteries and sodium-ion batteries) are widely used in electric vehicles, energy storage systems and other fields due to their advantages such as high energy density and long cycle life.

[0087] In the field of battery technology, the housing assembly of a battery device is typically composed of two parts combined to form a space for accommodating individual battery cells.

[0088] In related technologies, the two housing parts in a housing assembly are often fixed together using fasteners such as bolts. However, using bolts for fixing has many drawbacks. During installation, each bolt needs to be tightened individually, which is not only time-consuming and labor-intensive, but also cumbersome and reduces the assembly efficiency of the battery device.

[0089] In addition, after long-term use, the bolts may loosen, affecting the connection stability of the housing components and thus posing a potential threat to the safety and reliability of the battery device.

[0090] To address the cumbersome assembly process of the housing components in battery devices in related technologies, this application proposes a battery device that uses interlocking positioning and edge-wrapping structures to connect to two parts of the housing component. This interlocking method achieves fixation and positioning of the two housing parts without the need for bolts or other fasteners, simplifying the operation process and improving assembly efficiency.

[0091] Specifically, refer to Figure 2 As shown, this application embodiment provides a battery device 1100. The battery device 1100 disclosed in this application embodiment can be used in electrical devices that use the battery device 1100 as a power source or in various energy storage devices and energy storage systems that use the battery device 1100 as an energy storage element. Electrical devices can be, but are not limited to, mobile phones, portable devices, laptops, electric toys, power tools, electric vehicles, vehicles 1000, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0092] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0093] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 1100 is provided inside the vehicle 1000, and the battery device 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1100 can be used to power the vehicle 1000; for example, the battery device 1100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery device 1100 to supply power to the motor 1300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0094] In some embodiments of this application, the battery device 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0095] For ease of explanation, the following embodiments use a horizontally placed battery device 1100 as an example. The definition of direction can include vertical and horizontal directions, which are perpendicular. The vertical direction can be understood as the height direction of the housing assembly 1110, and the horizontal direction can be understood as the length or width direction of the housing assembly 1110. Therefore, in the vertical direction, the lower part of the housing assembly 1110 can be understood as the bottom of the housing assembly 1110, and the upper part of the housing assembly 1110 can be understood as the top of the housing assembly. Thus, in the following examples, the first direction is vertical, and the third and second directions are horizontal, with each of the first, second, and third directions being mutually perpendicular; that is, any one of the first, second, and third directions is perpendicular to the other two directions.

[0096] According to some embodiments of this application, refer to Figure 2-8 As shown, this application embodiment provides a battery device 1100, which includes a battery cell assembly 1120, a housing assembly 1110, a positioning structure 1130, and an edge-wrapping structure 1140. The housing assembly 1110 includes a first housing 1111 and a second housing 1112. The first housing 1111 and the second housing 1112 are arranged opposite to each other in a first direction X and together form a receiving cavity 1113, in which the battery cell assembly 1120 is housed. The positioning structure 1130 is connected to the first housing 1111. The edge-wrapping structure 1140 is connected to the second housing 1112. Along a second direction Y, the positioning structure 1130 and the edge-wrapping structure 1140 are interlocked. The second direction Y is perpendicular to the first direction X. In the second direction Y, the housing assembly 1110 has a relative... On the first side 1114 and the second side 1115 of the first housing 1111, positioning structures 1130 are connected. Correspondingly, on the first side 1114 and the second side 1115 of the second housing 1112, edging structures 1140 are connected. Each positioning structure 1130 is inserted into each edging structure 1140 in the second direction Y to restrict the movement of the edging structure 1140 relative to the positioning structure 1130 along the first direction X and the second direction Y. The second housing 1112 is heat-treated to be able to shrink in the second direction Y, so that the edging structure 1140 moves toward the positioning structure 1130 to be inserted into the positioning structure 1130. The edging structures 1140 located on the first side 1114 and the second side 1115 exert opposing forces on the positioning structure 1130 in the second direction Y.

[0097] Specifically, please refer to Figure 2 As shown, Figure 2This is an exploded structural diagram of a battery device 1100 provided in some embodiments of this application. The battery device 1100 includes a housing assembly 1110 and one or more battery cell assemblies 1120. A receiving cavity 1113 is formed within the housing assembly 1110, and the battery cell assemblies 1120 are housed within the receiving cavity 1113. Each battery cell assembly 1120 is typically formed by arranging multiple battery cells 1121. These multiple battery cells 1121 can be stacked in the second direction Y. Alternatively, for example, the battery cell assembly 1120 can also be a battery module. A battery module is formed by arranging and fixing multiple battery cells 1121 to form an independent module (i.e., a battery cell group). In each independent module, the multiple battery cells 1121 are stacked in the second direction Y (see below), and the multiple independent modules are sequentially arranged in the third direction Z, which is perpendicular to the second direction Y. As an example, a battery module can be formed by binding multiple battery cells 1121 together with cable ties. The housing assembly 1110 is used to provide a housing cavity 1113 for the battery cell assembly 1120, and the housing assembly 1110 can adopt various structural forms.

[0098] A battery cell 1121 refers to the smallest unit that makes up the battery device 1100. Each battery cell 1121 can be a secondary battery cell 1121 or a primary battery cell 1121; it can also be a lithium-sulfur battery cell 1121, a sodium-ion battery cell 1121, or a magnesium-ion battery cell 1121, but is not limited to these. The battery cell 1121 can be cylindrical, flat, cuboid, or other shapes.

[0099] Referring to Figure 2, the housing assembly 1110 may include a first housing 1111 and a second housing 1112. The first housing 1111 and the second housing 1112 are fastened together to form a closed space inside the housing assembly 1110, which is the receiving cavity 1113, for housing the battery cell assembly 1120. The aforementioned closure refers to covering or closing, and can be either sealed or unsealed. The first housing 1111 may be a top cover or a bottom plate. For example, the housing assembly 1110 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the housing assembly 1110 forms a closed space inside to housing the battery cell assembly 1120. The first housing 1111 can be a top cover, in which case the second housing 1112 is a frame and a bottom plate; or, the second housing 1112 can be a top cover, in which case the first housing 1111 is a frame and a bottom plate; or, the first housing 1111 can be a bottom plate, in which case the second housing 1112 is a frame and a top plate; or, the second housing 1112 can be a bottom plate, in which case the first housing 1111 is a frame and a top plate. Of course, the housing assembly 1110 formed by the first housing 1111 and the second housing 1112 can be of various shapes, such as a cylinder, a cuboid, etc. In this application, a rectangular housing assembly 1110 is used as an example for illustration.

[0100] In some embodiments, the housing assembly 1110 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing assembly 1110 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing assembly 1110 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0101] The first box 1111 and the second box 1112 are arranged opposite to each other in the first direction X. After the first box 1111 and the second box 1112 are engaged, the positioning structure 1130 can be connected to the edge-sealing structure 1140, thereby limiting and fixing the first box 1111 and the second box 1112, so that the second box 1112 cannot be separated from the first box 1111 at least along the first direction X. The first box 1111 and the second box 1112 form a limit in the first direction X.

[0102] Specifically, the positioning structure 1130 can be fixed or detached and connected to the first housing 1111. For example, the positioning structure 1130 can be connected to the first housing 1111 by fasteners such as bolts or clips; or the positioning structure 1130 can be welded to the first housing 1111; or the positioning structure 1130 can be integrally formed on the first housing 1111.

[0103] The edge-binding structure 1140 can be fixedly or detachably connected to the second housing 1112. For example, the edge-binding structure 1140 can be connected to the second housing 1112 by fasteners such as bolts and clips; or the edge-binding structure 1140 can be welded to the second housing 1112; or the edge-binding structure 1140 can be integrally formed on the second housing 1112.

[0104] Reference Figure 5-8 As shown, the positioning structure 1130 and the edge-wrapping structure 1140 are connected by a plug-in connection. The plug-in direction is along the second direction Y, which is perpendicular to the first direction X. This plug-in connection can at least restrict the edge-wrapping structure 1140 from moving relative to the positioning structure 1130 along the first direction X. That is, this plug-in connection can at least restrict the second housing 1112 from moving relative to the first housing 1111 along the first direction X. The restriction on the movement of the edging structure 1140 relative to the positioning structure 1130 along the first direction X should be understood as, in addition to restricting movement along the first direction X, movement in directions other than the first direction X can also be restricted. For example, the edging structure 1140 (and the second housing 1112) relative to the positioning structure 1130 (and the first housing 1111) along the second direction Y, which is perpendicular to the first direction X, can also be restricted. The edging structure 1140 (and the second housing 1112) relative to the positioning structure 1130 (and the first housing 1111) along a third direction Z, which is perpendicular to the first direction X and the second direction Y.

[0105] Combination Figure 8 As shown, since the edging structure 1140 can restrict the positioning structure 1130 from moving along the first direction X, it is understood that the edging structure 1140 must have an edging body (i.e., the second edging body 1142 below) that blocks the positioning structure 1130 in the first direction X. The edging body abuts against the surface of the positioning body, thereby restricting the positioning structure 1130 from moving along the first direction X, which means restricting the first box 1111 from moving relative to the second box 1112 in the first direction X.

[0106] During assembly, the housing assembly 1110 only requires aligning the edge-wrapping structure 1140 on the second housing 1112 with the positioning structure 1130 on the first housing 1111, and then inserting the edge-wrapping structure 1140 and the positioning structure 1130 in the second direction Y to achieve initial fixation of the first housing 1111 and the second housing 1112. No bolts or other fasteners are needed, greatly simplifying the assembly operation and improving assembly efficiency. When disassembly is required, simply separate the edge-wrapping structure 1140 from the positioning structure 1130 in the opposite direction; the operation is equally simple. Furthermore, the insertion and engagement of the positioning structure 1130 and the edge-wrapping structure 1140 restricts their relative movement in the first direction X, ensuring the stability of the connection between the first housing 1111 and the second housing 1112 in the first direction X, thereby providing reliable protection for the battery cell assembly 1120 within the accommodating cavity 1113.

[0107] In some embodiments, refer to Figure 3-6 As shown, in the second direction Y, the housing assembly 1110 has a first side 1114 and a second side 1115 opposite to each other. The first side 1114 and the second side 1115 of the first housing 1111 are both connected to positioning structures 1130. Correspondingly, the first side 1114 and the second side 1115 of the second housing 1112 are both connected to edge-binding structures 1140. Each positioning structure 1130 is inserted into each edge-binding structure 1140 in the second direction Y to restrict the edge-binding structure 1140 from moving relative to the positioning structure 1130 along the first direction X and the second direction Y.

[0108] Specifically, the first side 1114 and the second side 1115 are two positions of the housing assembly 1110 in the second direction Y, and these two positions are arranged opposite to each other on the housing assembly 1110 along the second direction Y. Since the housing assembly 1110 includes a first housing 1111 and a second housing 1112 arranged opposite to each other in the first direction X, it can be understood that the first housing 1111 has opposite first sides 1114 and second sides 1115 in the second direction Y, and the second housing 1112 has opposite first sides 1114 and second sides 1115 in the second direction Y. When the first direction X is vertical, the first side 1114 and the second side 1115 can be understood as the left side and the right side (or the front side and the rear side).

[0109] A positioning structure 1130 and an edge-binding structure 1140 form a plug-in combination. In this example, two plug-in combinations are set, which are located on the first side 1114 and the second side 1115 of the housing assembly 1110, respectively.

[0110] Specifically, on the first side 1114, a positioning structure 1130 is connected to the first housing 1111, and an edge-binding structure 1140 is connected to the second housing 1112. The positioning structure 1130 and the edge-binding structure 1140 are inserted into each other along the second direction Y. On the second side 1115, another positioning structure 1130 is connected to the first housing 1111, and another edge-binding structure 1140 is connected to the second housing 1112. The positioning structure 1130 and the edge-binding structure 1140 are inserted into each other along the second direction Y.

[0111] On the one hand, the insertion direction of the positioning structure 1130 and the edge-wrapping structure 1140 is along the second direction Y. It can be seen that the edge-wrapping structure 1140 forms a limit on the positioning structure 1130 in the first direction X. Setting two insertion combinations can improve the reliability of the limit in the first direction X. On the other hand, in the second direction Y, the two edge-wrapping structures 1140 are respectively on opposite sides of the second housing 1112. After the two positioning structures 1130 are inserted with the two edge-wrapping structures 1140, the two positioning structures 1130 restrict the movement of the two positioning structures 1130 and the first housing 1111 between the two positioning structures 1130 in the second direction Y.

[0112] As can be seen, the insertion design of positioning structure 1130 and edge-wrapping structure 1140 respectively set on the first side 1114 and the second side 1115 can restrict the movement of the first box 1111 relative to the second box 1112 along the first direction X, and also restrict their movement in the second direction Y. It can also be understood that after the first box 1111 and the second box 1112 are limited by the two insertion combinations on both sides, the first box 1111 cannot move relative to the second box 1112 in the vertical and left and right directions, thereby achieving the purpose of firmly connecting and assembling the first box 1111 and the second box 1112.

[0113] In some embodiments, the second housing 1112 is heat-treated to be able to shrink in the second direction Y, so that the edging structure 1140 moves toward the positioning structure 1130 to be inserted into the positioning structure 1130, and the edging structure 1140 located on the first side 1114 and the second side 1115 exerts opposing forces on the positioning structure 1130 in the second direction Y.

[0114] Specifically, the second housing 1112 is made of a material that can shrink and expand through heat treatment. For example, the material used to make the second housing 1112 has the property of thermal expansion and contraction. The second housing 1112 can expand when heated and shrink when cooled, thereby cleverly realizing the assembly of the positioning structure 1130 and the edge-wrapping structure 1140.

[0115] For example, when heated, the second housing 1112 will expand by a predetermined amount in the second direction Y, thereby increasing the distance between the first side 1114 and the second side 1115 of the second housing 1112, which in turn increases the distance between the two edging structures 1140 of the first side 1114 and the second side 1115. At this time, the second housing 1112 can be pre-assembled with the first housing 1111. Then, the second housing 1112 is cooled, causing it to contract in the second direction Y, shortening the distance between the first side 1114 and the second side 1115. After shortening, the positioning structures 1130 on both sides can be inserted and fitted with the edging structures 1140. The housing 1112 experiences a contraction force in the second direction Y. The edging structure 1140 of the first side 1114 and the second side 1115 applies opposing forces to the positioning structure 1130 in the second direction Y, thereby achieving a firm connection between the positioning structure 1130 and the edging structure 1140. The second housing 1112 is under tension in the second direction Y, creating tensile stress inside. Even if the first housing 1111 uses a large-area plate between the first side 1114 and the second side, the plate is less prone to vibration. This makes the structure of the second housing 1112 more durable and less likely to vibrate when the battery device 1100 is subjected to vibration, and it is also less likely to expand with other surrounding components, which helps reduce vibration noise. The first housing 1111 and the second housing 1112 are positioned and fixed through the insertion and cooperation of the positioning structure 1130 and the edging structure 1140.

[0116] Based on the above embodiments, this example further illustrates the assembly process and effects of the second housing 1112 and the first housing 1111. The second housing 1112 is heat-treated on the first housing 1111 to shrink in the second direction Y. The positioning structure 1130 applies opposing forces to the edge-wrapping structure 1140 in the second direction Y.

[0117] Specifically, during assembly, the second housing 1112 is initially inserted into the first housing 1111 using the positioning structure 1130 and the edge-sealing structure 1140, and then subjected to heat treatment. Due to the thermal expansion and contraction characteristics of the material, the second housing 1112 will shrink in the second direction Y during the heat treatment process. The positioning structure 1130 has a restraining effect on the edge-sealing structure 1140, thus limiting the shrinkage of the second housing 1112.

[0118] This force enables a tighter connection between the positioning structure 1130 and the edge-wrapping structure 1140, improving the stability of the connection and effectively reducing loosening caused by vibration and other factors during use. Simultaneously, the force also enhances the overall stiffness of the housing assembly 1110 in the second direction Y, improving the deformation resistance of the battery device 1100.

[0119] By heat-treating the second housing 1112, the connection between the positioning structure 1130 and the edge-wrapping structure 1140 is achieved, making the connection between the first housing 1111 and the second housing 1112 more convenient and improving the reliability of the connection.

[0120] In this embodiment, the first housing 1111 and the second housing 1112 can be connected and assembled by the insertion and engagement between the positioning structure 1130 on the first housing 1111 and the edge-wrapping structure 1140 on the second housing 1112, without the need for fasteners, which simplifies the assembly operation and improves the assembly efficiency. When the battery device 1100 is subjected to an external force along the second direction Y, the insertion structures on both sides (i.e., the engagement between the positioning structure 1130 and the insertion structure) can jointly bear the external force, limiting the relative displacement of the first housing 1111 and the second housing 1112 in the second direction Y, improving the overall structural stability of the housing assembly 1110, and thus better protecting the internal battery cell assembly 1120. Meanwhile, the symmetrical arrangement on both sides makes the box assembly 1110 more uniform under stress, reducing the possibility of excessive local stress and helping to extend the service life of the box assembly 1110. The plug-in structures on both sides can jointly bear the external force, limiting the relative displacement of the first box 1111 and the second box 1112 in the second direction Y, improving the overall structural stability of the box assembly 1110, and thus better protecting the internal battery cell assembly 1120. By heat-treating the second box 1112, the connection between the positioning structure 1130 and the edge-wrapping structure 1140 is achieved, making the connection between the first box 1111 and the second box 1112 more convenient and improving the reliability of the connection.

[0121] In some embodiments, refer to Figure 5-8 As shown, the positioning structure 1130 protrudes from the side wall of the first housing 1111 along the second direction Y, and the edge-sealing structure 1140 has a snap-fit ​​groove 1143, into which the positioning structure 1130 is inserted.

[0122] Specifically, the positioning structure 1130 can be understood as a protruding structure, such as a protruding block or a protruding plate. The positioning structure 1130 is connected to the side wall of the first housing 1111, and the side wall can be understood as the side wall of the first side 1114 or the side wall of the second side 1115 of the first housing 1111. The protrusion direction of the positioning structure 1130 is along the second direction Y, and the positioning structure 1130 extends outward from the side wall of the first housing 1111 along the second direction Y in a direction away from the side wall.

[0123] The edging structure 1140 can be a block structure or a bent plate structure. The edging structure 1140 has a snap-fit ​​groove 1143, which is a recess, and can be a blind groove or a through groove. The snap-fit ​​groove 1143 can be formed by recessing a portion of the material of the edging structure 1140, or it can be formed by enclosing components such as baffles on the edging structure 1140. The depth direction of the snap-fit ​​groove 1143 is along the second direction Y; therefore, the protruding structure can be inserted into the snap-fit ​​groove 1143 in the second direction Y.

[0124] Understandably, in the first direction X, the snap-fit ​​groove 1143 has two opposing groove walls (e.g., an upper groove wall and a lower groove wall) that can restrict the movement of the positioning structure 1130 in the first direction X.

[0125] It is also understandable that the slots 1143 of the first side 1114 and the second side 1115 on the second housing 1112 are arranged opposite to each other, and the outward extension directions of the positioning structures 1130 of the first side 1114 and the second side 1115 on the first housing 1111 are opposite to each other. The bottom walls of the two slots 1143 are opposite to each other in the second direction Y, thereby achieving the purpose of restricting the movement of the positioning structure 1130 and the first housing 1111 in the second direction Y. In this case, in the third direction Z, the slot 1143 can form a lateral slot or a through slot. When the first housing 1111 and the second housing 1112 are assembled, the positioning structure 1130 can be inserted into the slot 1143 from the lateral slot along the third direction Z, realizing the insertion and limiting of the positioning structure 1130 and the edge-sealing structure 1140.

[0126] In this embodiment, the insertion and engagement of the positioning structure 1130 and the snap-fit ​​groove 1143 makes the connection between the two more compact and reliable, further enhancing the connection stability between the first housing 1111 and the second housing 1112. Furthermore, the structure of the snap-fit ​​groove 1143 facilitates the insertion and removal of the positioning structure 1130, making operation simple and convenient. In addition, the manufacturing processes of the positioning structure 1130 protruding from the side wall of the first housing 1111 and the edge-wrapping structure 1140 with the snap-fit ​​groove 1143 are relatively simple, reducing production costs.

[0127] In some embodiments, refer to Figure 5-8 As shown, the first housing 1111 has a receiving groove with a depth extending along the first direction X, and the second housing 1112 covers the opening of the receiving groove to form a receiving cavity 1113; the positioning structure 1130 is disposed on the outer edge (or outer edge) of the opening and protrudes along the second direction Y in a direction away from the opening.

[0128] Specifically, the first housing 1111 can adopt a hollow structure with an open opening. That is, the interior of the first housing 1111 forms a receiving groove, in which the battery cell assembly 1120 can be accommodated. The battery cell assembly 1120 can enter and exit the receiving groove through the opening. The depth direction of the receiving groove is defined along the first direction X, taking the first direction X as the vertical direction for example.

[0129] The receiving slot has an opening, and the positioning structure 1130 is disposed on the outer edge (or outer periphery) of the opening. The positioning structure 1130 extends outward from the opening along the second direction Y in a direction away from the opening, thus protruding onto the side wall of the first housing 1111. This arrangement ensures that the positioning structure 1130 does not occupy the internal space of the receiving slot, guaranteeing that the receiving slot can accommodate a battery cell assembly 1120 of sufficient size. In addition, the positioning structure 1130 is located on the outer edge of the opening, facilitating alignment and insertion with the edge-wrapping structure 1140 on the second housing 1112. During assembly, the operator can more intuitively observe the positions of the positioning structure 1130 and the edge-wrapping structure 1140, improving the accuracy and efficiency of assembly.

[0130] The second housing 1112 covers the opening of the receiving groove, thereby closing the receiving groove to form a receiving cavity 1113, in which the battery cell assembly 1120 is housed. The second housing 1112 may be a plate-shaped structure; for example, the second housing 1112 may be a plate-shaped cover, in which case the edge-sealing structure 1140 is located at the edge of the cover.

[0131] Taking the first box 1111 as a rectangular box and the second box 1112 as a rectangular cover as an example, if the opening of the receiving groove faces upward or downward, then the second box 1112 is located above or below the first box 1111. The first box 1111 is provided with positioning structures 1130 on both the left and right sides. The positioning structures 1130 are located at the outer edge of the opening of the receiving groove. The second box 1112 is provided with edging structures 1140 on both the left and right sides. When the second box 1112 is assembled with the first box 1111, the second box 1112 is inserted from one side of the second box 1112 or the edging structure 1140 along the third direction Z (front and back direction), so that the positioning structure 1130 is inserted into the snap-fit ​​groove 1143 along the third direction Z.

[0132] In this embodiment, the positioning structure 1130 is arranged at the opening of the receiving groove, which facilitates the assembly of the edge-wrapping structure 1140 with it. After the edge-wrapping structure 1140 is inserted with the positioning structure 1130, it can provide better support and positioning for the second box 1112, further reducing the risk of displacement of the second box 1112 in the first direction X and the second direction Y, and ensuring the overall structural stability of the box assembly 1110.

[0133] In some embodiments, refer to Figure 9 and Figure 10 As shown, the first box 1111 has a first box wall 11111 on the first side 1114, and the positioning structure 1130 is connected to the first box wall 11111 and extends continuously along the wall surface of the first box wall 11111.

[0134] Specifically, the first box 1111 has a box wall 11114 on the first side 1114. The first box wall 11111 can be flat or curved. For example, the first box wall 11111 is a flat plate with its surface parallel to the second direction Y and the first direction X.

[0135] As for the positioning structure 1130, the positioning structure 1130 is connected to the first box wall 11111. Since the second box 1112 will cover the first box 1111, it can be known that the first box wall 11111 and the second box 1112 will have a certain mating length or contact length. Therefore, the positioning structure 1130 can be designed as a continuously extending structure, so that the positioning structure 1130 extends along the wall or surface of the first box wall 11111, so that the positioning structure 1130 is provided along the entire extension length of the first box wall 11111. The positioning structure 1130 forms an outwardly convex, continuous convex strip structure.

[0136] Correspondingly, the edge-binding structure 1140 is also continuous or discontinuous. The edge-binding structure 1140 is inserted into the positioning structure 1130, which helps to increase the length and area of ​​the insertion and improve the reliability of the insertion limit.

[0137] In this embodiment, the positioning structure 1130 extends continuously to form a raised strip structure. The raised structure is inserted into the edge-sealing structure 1140, which can increase the length and area of ​​the insertion limit, which is beneficial to improving the reliability of the limit on the first box 1111 and the second box 1112.

[0138] In some embodiments, refer to Figure 9 and Figure 10 As shown, the first box 1111 has a second box wall 11112 on the second side 1115, and the positioning structure 1130 is connected to the second box wall 11112 and extends continuously along the wall surface of the second box wall 11112.

[0139] Specifically, the first box 1111 has a second box wall 11112 on the second side 1115. The second box wall 11112 can be flat or curved. For example, if the second box wall 11112 is a flat plate with its surface parallel to the second direction Y and the first direction X, then the first box wall 11111 and the second box wall 11112 are arranged opposite to each other and parallel to each other.

[0140] As for the positioning structure 1130, the positioning structure 1130 is connected to the second box wall 11112. Since the second box 1112 will cover the first box 1111, it can be known that the second box wall 11112 will have a certain mating length or contact length with the second box 1112. Therefore, the positioning structure 1130 can be designed as a continuously extending structure, so that the positioning structure 1130 extends along the wall or surface of the second box wall 11112, so that the positioning structure 1130 is provided along the entire extension length of the second box wall 11112, and the positioning structure 1130 forms an outwardly convex, continuous convex strip structure.

[0141] Correspondingly, the edge-binding structure 1140 is also continuous or discontinuous. The edge-binding structure 1140 is inserted into the positioning structure 1130, which helps to increase the length and area of ​​the insertion and improve the reliability of the insertion limit.

[0142] In this embodiment, the positioning structure 1130 extends continuously to form a raised strip structure. The raised structure is inserted into the edge-sealing structure 1140, which can increase the length and area of ​​the insertion limit, which is beneficial to improving the reliability of the limit on the first box 1111 and the second box 1112.

[0143] In some embodiments, refer to Figure 11-13 As shown, the first box 1111 has a first box wall 11111 on the first side 1114, and the positioning structure 1130 is connected to the first box wall 11111 and is distributed intermittently along the wall surface of the first box wall 11111.

[0144] Specifically, the structural form of the first box wall 11111 can be seen in the example above. In this example, the positioning structure 1130 is distributed intermittently. Alternatively, the positioning structure 1130 can be considered as including multiple positioning parts connected to the first box wall 11111, with the multiple positioning parts arranged at intervals. It can be seen that the positioning structure 1130 can form multiple spaced-apart convex strip structures or protrusion structures along the extension length of the first box wall 11111. For example, the first box wall 11111 is parallel to the first direction X and the second direction Y, and the multiple positioning parts can be arranged sequentially at intervals along the third direction Z.

[0145] The discontinuously distributed positioning structure 1130 is more economical in terms of material usage, reducing production costs and the overall weight of the battery device 1100. During assembly, since each positioning structure 1130 exists independently, a slight positional deviation in one positioning structure 1130 will not significantly affect the insertion of other positioning structures 1130 and the edge-wrapping structure 1140, resulting in a relatively high assembly tolerance. Furthermore, in scenarios with stringent weight requirements, this discontinuously distributed structure better meets the needs. For example, in the battery device 1100 of an electric vehicle, weight reduction helps improve the vehicle's range; the discontinuously distributed positioning structure 1130 can contribute to weight reduction while maintaining a certain connection strength.

[0146] In this embodiment, the intermittent positioning structure 1130 can further reduce the weight of the positioning structure 1130 while ensuring connection reliability, which is beneficial to the lightweighting of the battery device 1100.

[0147] In some embodiments, refer to Figure 11-13 As shown, the first box 1111 has a second box wall 11112 on the second side 1115, and the positioning structure 1130 is connected to the second box wall 11112 and is distributed intermittently along the wall surface of the second box wall 11112.

[0148] Specifically, the structural form of the second box wall 11112 can be seen in the example above. In this example, the positioning structure 1130 is distributed intermittently. Alternatively, the positioning structure 1130 can be considered as including multiple positioning parts connected to the second box wall 11112, with the multiple positioning parts arranged at intervals. It can be seen that the positioning structure 1130 can form multiple spaced-apart convex strip structures or protrusion structures along the extension length of the second box wall 11112. For example, the second box wall 11112 is parallel to the first direction X and the second direction Y, and the multiple positioning parts can be arranged sequentially at intervals along the third direction Z.

[0149] Similarly, the discontinuously distributed positioning structure 1130 is more economical in terms of material usage, reducing production costs and the overall weight of the battery device 1100. During assembly, since each positioning structure 1130 exists independently, a slight positional deviation in one positioning structure 1130 will not significantly affect the insertion of other positioning structures 1130 and the edge-wrapping structure 1140, resulting in a relatively high assembly tolerance. Furthermore, in scenarios with stringent weight requirements, this discontinuously distributed structure better meets the needs. For example, in the battery device 1100 of an electric vehicle, weight reduction helps improve the vehicle's range; the discontinuously distributed positioning structure 1130 can contribute to weight reduction while maintaining a certain connection strength.

[0150] In this embodiment, the intermittent positioning structure 1130 can further reduce the weight of the positioning structure 1130 while ensuring connection reliability, which is beneficial to the lightweighting of the battery device 1100.

[0151] In some embodiments, refer to Figure 5 and Figure 6 as well as Figure 7 As shown, the edging structure 1140 includes a first edging body 1141 and a second edging body 1142 connected to each other. The first edging body 1141 extends along a first direction X. One end of the first edging body 1141 is connected to the second housing 1112, and the other end of the first edging body 1141 is connected to the second edging body 1142. The second edging body 1142 is arranged at a preset angle to the first edging body 1141, and the second edging body 1142 extends toward the middle area of ​​the second housing 1112, so that the first edging body 1141, the second edging body 1142 and the second housing 1112 together form a snap-fit ​​groove 1143; the positioning structure 1130 is inserted into the snap-fit ​​groove 1143.

[0152] Specifically, the first edging body 1141 and the second edging body 1142 are two parts of the edging structure 1140. The first edging body 1141 has two connecting ends. One connecting end is directly connected to the second housing 1112, and the other connecting end is connected to the second edging body 1142. The second edging body 1142 is set at an angle to the first edging body 1141, and the second edging body 1142 extends toward the middle area of ​​the second housing 1112, so that the first edging body 1141 and the second edging body 1142 form a bent structure. The bent structure and the second housing 1112 together form a snap-fit ​​groove 1143. The groove depth direction of the snap-fit ​​groove 1143 can be along the second direction Y, so that the positioning structure 1130 can be inserted into the snap-fit ​​groove 1143 along the second direction Y. The snap-fit ​​groove 1143 in this example can be referred to the above description.

[0153] For the edge-binding structure 1140, the first edge-binding body 1141 can be considered as the bottom wall of the snap-fit ​​groove 1143, and the second edge-binding body 1142 can be considered as a side wall of the snap-fit ​​groove 1143. When the preset included angle between the second edge-binding body 1142 and the first edge-binding body 1141 is 90°, the second edge-binding body 1142 can be arranged in a spaced-apart and parallel manner with a wall surface of the second box 1112, thereby forming a snap-fit ​​groove 1143 between the first edge-binding body 1141, the second edge-binding body 1142, and a wall surface of the second box 1112.

[0154] The first edge-binding body 1141 and the second edge-binding body 1142 can be integrally formed. The first edge-binding body 1141 can be connected to the second box 1112 by a fixed or detachable method. Alternatively, the first edge-binding body 1141, the second edge-binding body 1142 and the second box 1112 can be integrally formed.

[0155] The preset included angle can be set according to actual needs, as long as it ensures that the locking groove 1143 formed by the enclosure is compatible with the positioning structure 1130. This structure, in which the locking groove 1143 is formed by two edging bodies and the second box 1112, makes the forming of the locking groove 1143 more flexible and can be adjusted according to the shape and size of the positioning structure 1130. The first edging body 1141 extends along the first direction X, providing a good limiting effect for the positioning structure 1130 in the first direction X. The second edging body 1142 extends toward the middle of the second box 1112, cooperating with the second box 1112 in a plane perpendicular to the first direction X to constrain the positioning structure 1130, thereby ensuring the stability of the insertion between the positioning structure 1130 and the edging structure 1140.

[0156] The angular structure formed by the connection of the first edge-binding body 1141 and the second edge-binding body 1142 has good stability, can withstand large external forces, and is not easily deformed, thus ensuring that the constraint effect of the snap-fit ​​groove 1143 on the positioning structure 1130 is effective for a long time. In the manufacturing process, this edge-binding structure 1140 can be made by stamping, bending and other processes, which is relatively simple and suitable for mass production.

[0157] In this embodiment, the structure in which the first edging body 1141 and the second edging body 1142 are connected has high stability, is simple in structure, easy to manufacture, and is not easily deformed, which is conducive to improving the connection reliability between the edging structure 1140 and the positioning structure 1130.

[0158] In some embodiments, refer to Figure 7 and Figure 8 As shown, the preset included angle is 90°, and along the second direction Y, the second edging body 1142 has a first preset width L1, which ranges from 1mm to 100mm.

[0159] Specifically, given the preset included angle of 90°, it can be seen that the second edging body 1142 extends along the second direction Y. The extension length of the second edging body 1142 in the second direction Y can be considered as the width of the second edging body 1142. Therefore, the second edging body 1142 has a first preset width L1 in the second direction Y. The value of the first preset width L1 can reflect the depth of the snap-fit ​​groove 1143. The larger the value of the first preset width L1, the larger the depth of the snap-fit ​​groove 1143 in the second direction Y. That is, the greater the depth to which the positioning structure 1130 is inserted into the snap-fit ​​groove 1143, the larger the blocking area of ​​the second edging body 1142 on the positioning structure 1130, the stronger the supporting effect of the second edging body 1142 on the positioning structure 1130, and the better the limiting effect.

[0160] When the first preset width L1 is too small, the second edging body 1142 has a weaker constraint effect on the positioning structure 1130, which may cause the positioning structure 1130 to easily come out of the snap-fit ​​groove 1143; when the first preset width L1 is too large, it may occupy too much space in the middle area of ​​the second housing 1112, affecting the accommodation of the battery cell assembly 1120 or the arrangement of other components.

[0161] Limiting the first preset width L1 to the range of 1mm-100mm ensures that the second edging body 1142 has sufficient constraint on the positioning structure 1130, guaranteeing the stability of the connection, while also avoiding excessive space occupation, thus balancing structural stability and space utilization. For example, for a small battery device 1100, the first preset width L1 of the second edging body 1142 can be selected from 1mm to 30mm; for a large battery device 1100, the first preset width L1 can be selected from 30mm to 100mm to adapt to different usage scenarios. The value of the first preset width L1 can be any value between 1mm and 100mm, for example, the first preset width L1 is 5mm, 10mm, 15mm, 20mm...100mm, etc.

[0162] In this embodiment, the preset included angle is set to 90°, which makes the first edging body 1141 and the second edging body 1142 perpendicular to each other, which facilitates the fit and connection between the second edging body 1142 and the surface of the positioning body, and improves the reliability of the connection.

[0163] In some embodiments, refer to Figure 14-16 As shown, the first housing 1111 also has a limiting groove 1131, and the second edging body 1142 is inserted into the limiting groove 1131.

[0164] Specifically, the limiting groove 1131 is used to engage with the end of the first edging body 1141 that is away from the second edging body 1142. The limiting groove 1131 can position and fix the second edging body 1142, thereby enhancing the stability of the connection between the second edging body 1142 and the second housing 1112.

[0165] For example, the second limiting groove 1131 is formed on the first box wall 11111 or the second box wall 11112 of the first box body 1111. The extension direction of the groove opening of the second limiting groove 1131 is consistent with the extension direction of the edge-sealing structure 1140 (specifically the second edge-sealing body 1142). Of course, the extension direction of the groove opening of the second limiting groove 1131 can also be the same as the extension direction of the positioning structure 1130.

[0166] The groove depth of the limiting groove 1131 is along the second direction Y. Therefore, it can be seen that the limiting groove 1131 can limit the second edge-covering body 1142 in the first direction X. The snap-fit ​​groove 1143 and the limiting groove 1131 are two groove structures with opposite groove depth directions, so that the edge-covering structure 1140, the positioning structure 1130 and the first box 1111 form a plug-in interlocking structure, thereby improving the reliability of the connection between the positioning structure 1130 and the edge-covering structure 1140.

[0167] The groove opening of the limiting groove 1131, the positioning structure 1130, and the edge-wrapping structure 1140 (first edge-wrapping body 1141 and second edge-wrapping body 1142) can all extend along the third direction Z. When the first housing 1111 and the second housing 1112 are assembled, along the third direction Z, the positioning structure 1130 is inserted into the snap-fit ​​groove 1143 of the edge-wrapping structure 1140, and at the same time, the second edge-wrapping body 1142 can be inserted into the limiting groove 1131. Of course, the connection between the positioning structure 1130 and the edge-wrapping structure 1140 can also adopt the heat treatment method described below (such as thermal expansion and contraction), which will not be elaborated here, but can be referred to the examples above and below.

[0168] In this example, when the edge-wrapping structure 1140 is subjected to external force, the limiting groove 1131 can share part of the force, reducing the stress at the connection between the second edge-wrapping body 1142 and the first housing 1111, and reducing the possibility of loosening or breakage at the connection. For example, when the battery device 1100 encounters bumps and vibrations during transportation, the second edge-wrapping body 1142 may be subjected to outward or inward forces. The limiting groove 1131 can block these forces, limiting excessive movement and ensuring the positional stability of the entire edge-wrapping structure 1140. This, in turn, ensures the reliability of the insertion between the positioning structure 1130 and the edge-wrapping structure 1140, providing continuous and stable protection for the battery cell assembly 1120.

[0169] In this embodiment, by setting the limiting groove 1131, the edge-binding structure 1140 can be further limited, thereby improving the reliability and stability of the connection between the positioning structure 1130 and the edge-binding structure 1140.

[0170] In some embodiments, refer to Figure 9 and Figure 10 As shown, the second box 1112 has a third box wall 11121 on the first side 1114, and the edge-sealing structure 1140 is connected to the third box wall 11121 and extends continuously along the wall surface of the third box wall 11121.

[0171] Specifically, the second box 1112 has a third box wall 11121 on the first side 1114. The third box wall 11121 can be flat or curved. For example, the third box wall 11121 is a flat plate with its surface parallel to the second direction Y and the first direction X.

[0172] For the edge-sealing structure 1140, the edge-sealing structure 1140 is connected to the third box wall 11121. Since the second box 1112 will cover the first box 1111, it can be known that the third box wall 11121 will have a certain mating length or contact length with the first box 1111. Therefore, the edge-sealing structure 1140 can be designed as a continuously extending structure, so that the edge-sealing structure 1140 extends along the wall or surface of the third box wall 11121, so that the entire third box wall 11121 will be provided with the edge-sealing structure 1140 along its extension length. The edge-sealing structure 1140 forms an outwardly convex, continuous strip structure.

[0173] Correspondingly, the positioning structure 1130 is also continuous or discontinuous, and the edge-wrapping structure 1140 is inserted into the positioning structure 1130, which helps to increase the length and area of ​​the insertion and improve the reliability of the insertion limit.

[0174] In this embodiment, the edge-binding structure 1140 extends continuously to form a strip structure. The strip structure is inserted into the positioning structure 1130, which increases the length and area of ​​the insertion limit, thereby improving the reliability of the limit on the first box 1111 and the second box 1112.

[0175] In some embodiments, refer to Figure 9 and Figure 10 As shown, the second box 1112 has a fourth box wall 11122 on the second side 1115. The edging structure 1140 is connected to the fourth box wall 11122 and extends continuously along the wall surface of the fourth box wall 11122. The distribution of the edging structure 1140 of the fourth box wall 11122 can be referred to Figure 10 A schematic diagram of the distribution of the edging structure 1140 on the third box wall 11121.

[0176] Specifically, the second box 1112 has a fourth box wall 11122 on the second side 1115. The fourth box wall 11122 can be flat or curved. For example, the third box wall 11121 is a flat plate with its surface parallel to the second direction Y and the first direction X.

[0177] For the edge-sealing structure 1140, the edge-sealing structure 1140 is connected to the fourth box wall 11122. Since the second box 1112 will cover the first box 1111, it can be known that the fourth box wall 11122 will have a certain mating length or contact length with the first box 1111. Therefore, the edge-sealing structure 1140 can be designed as a continuously extending structure, so that the edge-sealing structure 1140 extends along the wall or surface of the fourth box wall 11122, so that the entire fourth box wall 11122 will be provided with the edge-sealing structure 1140 along its extension length. The edge-sealing structure 1140 forms an outwardly convex, continuous strip structure.

[0178] The edging structures 1140 on the third box wall 11121 and the fourth box wall 11122 can both be continuous, or either one can be continuous; correspondingly, the positioning structures 1130 on the first box wall 11111 and the second box wall 11112 can both be continuous, or either one can be continuous. The edging structure 1140 and the positioning structure 1130 are interlocked, which helps to increase the length and area of ​​the interlocking and improves the reliability of the interlocking limit.

[0179] In this embodiment, the edge-binding structure 1140 extends continuously to form a strip structure. The strip structure is inserted into the positioning structure 1130, which increases the length and area of ​​the insertion limit, thereby improving the reliability of the limit on the first box 1111 and the second box 1112.

[0180] In some embodiments, refer to Figure 11 As shown, the second box 1112 has a third box wall 11121 on the first side 1114, and the edge-sealing structure 1140 is connected to the third box wall 11121 and is distributed intermittently along the wall surface of the third box wall 11121.

[0181] Specifically, the structural form of the third box wall 11121 can be seen in the example above. In this example, the edging structure 1140 is distributed intermittently. It can also be considered that the edging structure 1140 includes multiple edging portions connected to the third box wall 11121, and the multiple edging portions are arranged at intervals. It can be seen that the edging structure 1140 can form multiple spaced strip structures or protrusion structures along the extension length of the third box wall 11121. For example, the third box wall 11121 is parallel to the first direction X and the second direction Y, and the multiple edging portions can be arranged sequentially at intervals along the third direction Z.

[0182] The discontinuously distributed edge-wrapping structure 1140 is more economical in terms of material usage, reducing production costs and the overall weight of the battery device 1100. During assembly, since each edge-wrapping structure 1140 exists independently, a slight positional deviation in one edge-wrapping structure 1140 will not significantly affect the insertion of other positioning structures 1130 with the edge-wrapping structure 1140, resulting in a relatively high assembly tolerance. Furthermore, in scenarios with strict weight requirements, this discontinuously distributed edge-wrapping structure 1140 better meets the needs. For example, in the battery device 1100 of an electric vehicle, weight reduction helps improve the vehicle's range; the discontinuously distributed edge-wrapping structure 1140 can contribute to weight reduction while maintaining a certain connection strength.

[0183] In this embodiment, the intermittent edge-wrapping structure 1140 can further reduce the weight of the positioning structure 1130 while ensuring connection reliability, which is beneficial to the lightweighting of the battery device 1100.

[0184] In some embodiments, refer to Figure 9 As shown, the second box 1112 has a fourth box wall 11122 on the second side 1115. The edging structure 1140 is connected to the fourth box wall 11122 and is distributed intermittently along the wall surface of the fourth box wall 11122. The distribution of the edging structure 1140 on the fourth box wall 11122 can be referred to Figure 11 A schematic diagram of the distribution of the edging structure 1140 on the third box wall 11121.

[0185] Specifically, the structural form of the fourth box wall 11122 can be seen in the example above. In this example, the edging structure 1140 is distributed intermittently. It can also be considered that the edging structure 1140 includes multiple edging portions connected to the fourth box wall 11122, and the multiple edging portions are arranged at intervals. It can be seen that the edging structure 1140 can form multiple spaced strip structures or protrusion structures along the extension length of the fourth box wall 11122. For example, the fourth box wall 11122 is parallel to the first direction X and the second direction Y, and the multiple edging portions can be arranged sequentially at intervals along the third direction Z.

[0186] The discontinuously distributed edge-wrapping structure 1140 is more economical in terms of material usage, reducing production costs and the overall weight of the battery device 1100. During assembly, since each edge-wrapping structure 1140 exists independently, a slight positional deviation in one edge-wrapping structure 1140 will not significantly affect the insertion of other positioning structures 1130 with the edge-wrapping structure 1140, resulting in a relatively high assembly tolerance. Furthermore, in scenarios with strict weight requirements, this discontinuously distributed edge-wrapping structure 1140 better meets the needs. For example, in the battery device 1100 of an electric vehicle, weight reduction helps improve the vehicle's range; the discontinuously distributed edge-wrapping structure 1140 can contribute to weight reduction while maintaining a certain connection strength.

[0187] The edging structures 1140 on the third box wall 11121 and the fourth box wall 11122 can both be discontinuous, or either one can be discontinuous; correspondingly, the positioning structures 1130 on the first box wall 11111 and the second box wall 11112 can both be discontinuous, or either one can be continuous. The edging structures 1140 and the positioning structures 1130 are interlocked, which helps to increase the length and area of ​​the interlocking and improves the reliability of the interlocking limit.

[0188] In this embodiment, the intermittent edge-wrapping structure 1140 can further reduce the weight of the positioning structure 1130 while ensuring connection reliability, which is beneficial to the lightweighting of the battery device 1100.

[0189] In some embodiments, the positioning structure 1130 and the edge-binding structure 1140 are interference-fitted.

[0190] Specifically, the size of the positioning structure 1130 is slightly larger than the size of the insertion part (such as the snap-fit ​​groove 1143) on the edging structure 1140. During assembly, a certain external force needs to be applied to insert the positioning structure 1130 into the edging structure 1140. This connection method ensures that there is no gap between the positioning structure 1130 and the edging structure 1140, allowing for a tight fit.

[0191] The interference fit can effectively reduce the probability of relative loosening between the positioning structure 1130 and the edge-wrapping structure 1140. Even if the battery device 1100 is subjected to large vibration or impact, the positioning structure 1130 and the edge-wrapping structure 1140 can maintain a stable connection, thereby ensuring the reliability of the connection between the first housing 1111 and the second housing 1112 and providing a stable protective environment for the battery cell assembly 1120.

[0192] Furthermore, due to the use of an interference fit, no additional fasteners are required, which simplifies the assembly process and reduces safety hazards caused by loose fasteners. However, the interference fit needs to be carefully controlled during the design process. The appropriate interference fit is typically determined based on the elastic properties of the materials of the positioning structure 1130 and the edging structure 1140, as well as the stress requirements of the application scenario.

[0193] In this embodiment, the positioning structure 1130 and the edge-wrapping structure 1140 are connected by an interference fit, which can reduce the risk of loosening between the positioning structure 1130 and the edge-wrapping structure 1140 and improve the reliability of their connection.

[0194] In some embodiments, the second housing 1112 is a housing made of aluminum alloy or carbon steel.

[0195] Specifically, aluminum alloys possess advantages such as low density, high strength, and good corrosion resistance. Using aluminum alloys to fabricate the second housing 1112 reduces the overall weight of the battery device 1100 while maintaining structural strength, which is particularly important for applications where weight is a concern (such as electric vehicles and drones). Furthermore, aluminum alloys have good machinability, facilitating the manufacture of various complex structures to meet the connection requirements between the second housing 1112 and components such as the edging structure 1140.

[0196] Carbon steel, on the other hand, possesses high strength and hardness while being relatively inexpensive. Using carbon steel to fabricate the second housing 1112 provides stronger structural support and protection for the battery cell assembly 1120, making it suitable for applications requiring high housing strength. Furthermore, carbon steel exhibits good weldability, facilitating connection and fixation with other components.

[0197] In addition, aluminum alloy and carbon steel materials have good thermal deformation properties. They can expand when heated and contract when cooled, thus enabling the clever assembly of the positioning structure 1130 and the edge-wrapping structure 1140. The first housing 1111 and the second housing 1112 are limited and fixed through the interlocking of the positioning structure 1130 and the edge-wrapping structure 1140.

[0198] In this embodiment, aluminum alloy or carbon steel is selected to prepare the second box 1112. The thermal expansion and contraction properties of the material can be used to achieve the purpose of plugging and positioning between the positioning structure 1130 and the edge-wrapping structure 1140, thereby improving the convenience of connection.

[0199] In some embodiments, refer to Figure 18 and Figure 19As shown, in the third direction Z, the housing assembly 1110 has opposing third side 1116 and fourth side 1117, with the third side 1116 of the first housing 1111 being fixedly or detachably connected to the third side 1116 of the second housing 1112.

[0200] Furthermore, the fourth side 1117 of the first housing 1111 and the fourth side 1117 of the second housing 1112 are fixedly or detachably connected.

[0201] Specifically, the third side 1116 and the fourth side 1117 are the two opposite sides of the housing assembly 1110 in the third direction Z. For example, when the third direction Z is the front-rear direction of the housing assembly 1110, then the third side 1116 and the fourth side 1117 are the front and rear sides of the housing assembly 1110. Then, the first side 1114 and the second side are the left and right sides of the housing assembly 1110.

[0202] The fixing or detachable methods may include bonding, bolting, snap-fitting, and welding. For example, the third side 1116 of the first housing 1111 is fixed to the third side 1116 of the second housing 1112 by bonding, and the fourth side 1117 of the first housing 1111 and the fourth side 1117 of the second housing 1112 can also be fixed by bonding, for example, referring to... Figure 19 As shown, an adhesive structure 1150 is provided between the third side 1116 of the first housing 1111 and the third side 1116 of the second housing 1112, and an adhesive structure 1150 is provided between the fourth side 1117 of the first housing 1111 and the fourth side 1117 of the second housing 1112. It is understood that in this example, during the assembly of the first housing 1111 and the second housing 1112, the connections between the third sides 1116 and the fourth side 1117 should be made after the first side 1114 is connected and the second side 1115 is connected.

[0203] In this embodiment, by adding connections and fixation between the first housing 1111 and the second housing 1112 on the third side 1116 and the fourth side 1117, the reliability of the connection between the first housing 1111 and the second housing 1112 can be further improved.

[0204] In some embodiments, the positioning structure 1130 is integrally formed on the first housing 1111. In other embodiments, the edge-sealing structure 1140 is integrally formed on the second housing 1112.

[0205] Specifically, integral molding refers to manufacturing the positioning structure 1130 and the first housing 1111, and the edge-binding structure 1140 and the second housing 1112 into a single unit through a one-time molding process. For example, injection molding, casting, stamping, and other processes can be used. Taking injection molding as an example, for the first housing 1111 and the positioning structure 1130 made of plastic, molten plastic can be injected into the same mold. After cooling and solidification, the positioning structure 1130 and the first housing 1111 form an inseparable unit. For the first housing 1111 and the positioning structure 1130 made of metal, a casting process can be used, pouring molten metal into a mold containing the shapes of the first housing 1111 and the positioning structure 1130, resulting in a single unit. The integral molding of the edge-binding structure 1140 and the second housing 1112 can also be achieved using the aforementioned processes.

[0206] In terms of connection strength, the integrated molding structure eliminates the connection interface between the positioning structure 1130 and the first housing 1111, and between the edge-wrapping structure 1140 and the second housing 1112. This helps to reduce the occurrence of problems such as weak connection and easy loosening that may occur due to welding, bolt connection, etc., and greatly improves the strength and stability of the overall structure. It can better withstand various external forces and ensure the safe operation of the battery device 1100.

[0207] In terms of manufacturing process, one-piece molding simplifies the production process, reduces the number of parts and assembly steps, and lowers errors and costs during production. Originally, it was necessary to manufacture the positioning structure 1130, the first housing 1111, the edge-wrapping structure 1140, and the second housing 1112 separately and then assemble them. However, the one-piece molding process can complete the process in one go, improving production efficiency and reducing quality problems caused by improper assembly.

[0208] In terms of service life, the unibody structure eliminates the risks of wear and corrosion at the connection points. If a detachable connection method is used, gaps or damage may occur at the connection points after long-term use due to factors such as vibration and environmental corrosion. The unibody structure effectively reduces the probability of such problems and helps extend the service life of the battery device 1100.

[0209] Furthermore, unibody molding allows for a more compact and rational structural design, reducing unnecessary space occupation and facilitating the miniaturization and weight reduction of the battery device 1100. For example, in the electric vehicle battery device 1100, lightweight design helps improve driving range, while the compact structure better adapts to the limited installation space inside the vehicle.

[0210] In this embodiment, the integral molding design of the positioning structure 1130 and the first box 1111, and the edge-wrapping structure 1140 and the second box 1112 can ensure structural strength and stability, improve production efficiency, reduce costs and extend service life.

[0211] According to some embodiments of this application, refer to Figure 1 As shown, this application also provides an electrical device, which includes the battery device 1100 in the above embodiments. The battery device 1100 is used to store or provide electrical energy.

[0212] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 1121, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0213] The examples of electrical devices in this application are based on the examples of the battery device 1100 described above. The examples of electrical devices include all the technical effects of the examples of the battery device 1100 described above, and will not be repeated here.

[0214] According to some embodiments of this application, this application also provides an energy storage device, which includes the battery device 1100 in the above embodiments.

[0215] Specifically, the energy storage device may include one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices 1100, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device. The definition of battery device 1100 is given in section 2.6.

[0216] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0217] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0218] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0219] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0220] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 1100 via piping to regulate the temperature of the individual battery cells 1121.

[0221] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0222] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0223] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0224] As an example, a power distribution module can be used to distribute power to modules in an energy storage device that require electricity.

[0225] According to some embodiments of this application, this application also provides an energy storage system, which includes the energy storage device in the above embodiments.

[0226] In some embodiments, an energy storage system may include one or more energy storage devices and a power conversion system (PCS), wherein the power conversion system is connected between a power generation device and an energy storage device. The power generation device generates electrical energy, the energy storage device stores electrical energy, and the power conversion system converts the current input to the energy storage device or the current output from the energy storage device into power. The electrical energy generated by the power generation device can be stored in the energy storage device through the power conversion system, and the electrical energy stored in the energy storage device can also be output to a load or the power grid through the power conversion system. As examples, the power generation device may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0227] According to some embodiments of this application, this application also provides a charging network, which includes charging piles and energy storage devices or energy storage systems as described in the above embodiments, wherein the energy storage devices are used to provide electrical energy to the charging piles.

[0228] For example, the charging network includes charging stations and energy storage devices. The charging stations are electrically connected to the energy storage devices, which provide power to the charging stations. The charging stations are also electrically connected to a battery device 1100 within the energy storage device via cables. The battery device 1100 can supply its stored electrical energy to the charging stations. The charging stations have one or more connectors for connecting to electrical devices (such as vehicle 1000), thereby enabling them to replenish power.

[0229] Energy storage devices can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0230] This application also provides a method for manufacturing a battery device 1100, referring to... Figure 20 As shown, this method is applied to the battery device 1100 in the above embodiment, and the method specifically includes the following steps:

[0231] Step S01: Perform a first heat treatment on the second housing 1112 to cause the second housing 1112 to expand at least in the second direction Y.

[0232] Specifically, the purpose of the first heat treatment of the second housing 1112 is to cause the second housing 1112 to expand, mainly to cause the second housing 1112 to expand in the second direction Y. The main reason is that the positioning structure 1130 and the edge-wrapping structure 1140 are interlocked in the second direction Y. It can be understood that the positioning structure 1130 and the edge-wrapping structure 1140 are arranged opposite to each other in the second direction Y. After the first heat treatment of the second housing 1112, the second housing 1112 expands, thereby causing the edge-wrapping structure 1140 on it to move in the second direction Y toward a direction away from the positioning structure 1130, so that the edge-wrapping structure 1140 moves away from the positioning structure 1130.

[0233] The above design ensures that during the pre-assembly of the first housing 1111 and the second housing 1112, there will be no interference between the positioning structure 1130 and the edge-sealing structure 1140. Therefore, in this step, since the positioning structure 1130 and the edge-sealing structure 1140 are detached and do not interfere, the second housing 1112 can be directly placed on the first housing 1111 along the first direction X, without requiring the positioning structure 1130 to be inserted into the snap-fit ​​groove 1143 of the edge-sealing structure 1140 along the third direction Z. This first heat treatment method enables more convenient assembly and fastening of the first housing 1111 and the second housing 1112.

[0234] The first heat treatment can be either heating or cooling, depending on the material properties of the second housing 1112. For example, if the second housing 1112 is made of aluminum alloy or carbon steel, and aluminum alloy or carbon steel has the property of thermal expansion and contraction, then the first heat treatment should be heating.

[0235] Step S02: The second box 1112 is pre-assembled with the first box 1111.

[0236] Since the second housing 1112 is in an expanded state after the first heat treatment, there will be no interference between the positioning structure 1130 and the edge-wrapping structure 1140 during assembly. The first housing 1111 and the second housing 1112 can be directly fastened along the first direction X, making the pre-assembly of the first housing 1111 and the second housing 1112 more convenient.

[0237] It should be noted that the expansion of the second housing 1112 is multi-directional, not only in the second direction Y, but also in the first direction X and the third direction Z. Since the third direction Z does not involve the positioning structure 1130 and the edge-wrapping structure 1140, its expansion will not be analyzed here. Because the second housing 1112 has a large length in the second direction Y—for example, if the second housing 1112 uses a cover plate with a large length in the second direction Y and a thinner thickness in the first direction X—the expansion of the second housing 1112 in the thickness direction is relatively small. After the first housing 1111 and the second housing 1112 are pre-assembled, although the positioning structure 1130 and the edge-wrapping structure 1140 will not be strictly opposite each other in the second direction Y, the misalignment of the positioning structure 1130 and the edge-wrapping structure 1140 in the first direction X is relatively small.

[0238] Step S03, the second housing 1112 is subjected to a second heat treatment, causing the second housing 1112 to shrink at least in the second direction Y, and the edge-wrapping structure 1140 moves toward the positioning structure 1130 to be inserted between them.

[0239] Specifically, the purpose of the second heat treatment on the second housing 1112 is to cause the second housing 1112 to shrink, mainly in the second direction Y. This is primarily because the positioning structure 1130 and the edge-wrapping structure 1140 need to be interlocked along the second direction Y. After the first heat treatment, the second housing 1112 expands, causing the edge-wrapping structure 1140 to move away from the positioning structure 1130 along the second direction Y. Then, after the first housing 1111 and the second housing 1112 are pre-assembled, the second heat treatment on the second housing 1112 causes it to shrink, causing the edge-wrapping structure 1140 to move closer to the positioning structure 1130 along the second direction Y, thus allowing the edge-wrapping structure 1140 to interlock with the positioning structure 1130.

[0240] The second heat treatment can be either cooling or heating, depending on the material properties of the second housing 1112. For example, if the second housing 1112 is made of aluminum alloy or carbon steel, and aluminum alloy or carbon steel has the property of thermal expansion and contraction, then the second heat treatment should be cooling.

[0241] In this embodiment, the second housing 1112 is heat-treated so that it can expand and contract at least in the second direction Y, thereby enabling the positioning structure 1130 and the edge-wrapping structure 1140 to be inserted and fitted together. This makes the assembly between the first housing 1111 and the second housing 1112 more convenient, without the need for fasteners, which helps to simplify the assembly operation and improve the assembly efficiency.

[0242] In some embodiments, the second housing 1112 has a second preset width L2 along the second direction Y; the edging structure 1140 includes a first edging body 1141 and a second edging body 1142 connected to each other, the first edging body 1141 extends along the first direction X, one end of the first edging body 1141 is connected to the second housing 1112, the other end of the second edging body 1142 is connected to the second edging body 1142, the second edging body 1142 is arranged at a 90° angle to the first edging body 1141, and the second edging body 1142 extends toward the middle region of the second housing 1112 with a first preset width L1; the ratio of the first preset width L1 to the second preset width L2 is greater than 0 and less than or equal to 2.3 × 10⁻³.

[0243] Specifically, the structural design of the edging structure 1140 can be referred to the above embodiment.

[0244] The extension width of the second edging body 1142 in the second direction Y is defined as the first preset width L1, and the extension width of the second box body 1112 in the second direction Y can be considered as the width of the second box body 1112, which is defined as the second preset width L2. Considering that after the first heat treatment, the second box body 1112 needs to be pre-assembled with the first box body 1111, when the second box body 1112 is fastened to the first box body 1111 along the first direction X, the expansion of the second box body 1112 in the second direction Y should ensure that there is no interference between the edging structure 1140 and the positioning structure 1130. Therefore, the first preset width L1 of the second edging body 1142 needs to be reasonably designed.

[0245] Specifically, based on the thermal expansion formula:

[0246] ΔL=a×L0×ΔT

[0247] Where ΔL is the elongation (i.e., the expansion in the second direction Y); a is the coefficient of thermal expansion; L0 is the original length; and ΔT is the temperature change.

[0248] Taking the second housing 1112 as an example, the calculation of the elongation of the aluminum rod is as follows:

[0249] α (aluminum) = 23.6 × 10 -6 / °C;

[0250] L0 = 1 m = 1000 mm;

[0251] ΔT = 200 °C;

[0252] So,

[0253] ΔL (aluminum) = (23.6 × 10) -6 ) ×1000×200= 4.720 mm;

[0254] Therefore, the elongation of the aluminum rod is 4.72 mm.

[0255] Taking the second housing 1112 as an example, the calculation of the elongation of the aluminum-carbon steel rod is as follows:

[0256] α (carbon steel) = 12.0 × 10 -6 / °C;

[0257] L0 = 1 m = 1000 mm;

[0258] ΔT = 200 °C;

[0259] So,

[0260] ΔL (carbon steel) = (12.0 × 10) -6 ) ×1000×200= 2.400 mm;

[0261] Therefore, the elongation of the carbon steel bar is 2.40 mm.

[0262] When both the first side 1114 and the second side 1115 are provided with positioning structure 1130 and edging structure 1140, the values ​​of ΔL (aluminum) and ΔL (carbon steel) should be half of each other.

[0263] According to calculations, when the material of the second housing 1112 is aluminum alloy, the second preset width L2 is 1000mm, and the first preset width L1 should be less than 2.3mm; when the material of the second housing 1112 is carbon steel, the first preset width L1 should be less than 1.1mm.

[0264] Based on the above, it can be concluded that when the second housing 1112 is made of aluminum alloy, the first preset width L1 / second preset width L2 ≤ 2.3 / 1000; when the second housing 1112 is made of carbon steel, the first preset width L1 / second preset width L2 ≤ 1.2 / 1000.

[0265] In this embodiment, by limiting the ratio of the width of the second edging body 1142 to the width of the second box 1112, the positioning structure 1130 and the edging structure 1140 are less likely to interfere when the first box 1111 and the second box 1112 are pre-assembled. In addition, the connection reliability between the positioning structure 1130 and the edging structure 1140 can also be guaranteed.

[0266] In some embodiments, the temperature difference between the first heat treatment and the second heat treatment is 150°C-250°C.

[0267] A suitable temperature difference is crucial to ensuring that the second housing 1112 can expand sufficiently during the first heat treatment and contract effectively with the positioning structure 1130 during the second heat treatment. If the temperature difference is too small, the expansion and contraction of the second housing 1112 will be insufficient, which may result in insufficient operating space during pre-assembly or a loose final connection. If the temperature difference is too large, the expansion and contraction of the second housing 1112 will be excessive, which may cause excessive internal stress in the second housing 1112 during thermal expansion and contraction, leading to structural deformation or damage.

[0268] Setting the temperature difference between 150℃ and 250℃ ensures that the second housing 1112 has sufficient expansion and contraction for smooth assembly and stable connection, while reducing damage to the second housing 1112 caused by excessive temperature changes, thus ensuring the structural integrity and performance stability of the battery device 1100. For example, when the first heat treatment temperature is 250℃ and the second heat treatment temperature is 50℃, the temperature difference is 200℃, which falls within this range and can better meet the assembly requirements.

[0269] In this embodiment, the temperature difference between the first heat treatment and the second heat treatment is 150℃-250℃, which can ensure the reliable fit between the positioning structure 1130 and the edge-wrapping structure 1140.

[0270] The above are merely preferred embodiments of this application, and only specifically describe the technical principles of this application. These descriptions are only for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, as well as other specific embodiments of this application that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, include: Battery cell assembly; The housing assembly includes a first housing and a second housing, wherein the first housing and the second housing are arranged opposite to each other in a first direction and together enclose a receiving cavity, and the battery cell assembly is housed in the receiving cavity; A positioning structure is connected to the first housing, and the positioning structure protrudes from the side wall of the first housing along a second direction; An edge-sealing structure is connected to the second housing. The edge-sealing structure has a snap-fit ​​groove, the depth of which is along a second direction. Along the second direction, the positioning structure is inserted into the snap-fit ​​groove, and the second direction is perpendicular to the first direction. In the second direction, the housing assembly has a first side and a second side facing each other. The positioning structure is connected to both the first side and the second side of the first housing. Correspondingly, the edge-wrapping structure is connected to both the first side and the second side of the second housing. The slots of the two snap-fit ​​grooves on the first side and the second side are arranged opposite to each other along the second direction. Each positioning structure is inserted into each edge-wrapping structure in the second direction to restrict the movement of the edge-wrapping structure relative to the positioning structure along the first direction and the second direction. The second housing is heat-treated to shrink in the second direction, so that the edge-wrapping structure moves toward the positioning structure to be inserted into the positioning structure. The edge-wrapping structures located on the first side and the second side apply opposing forces to the positioning structure in the second direction.

2. The battery device as claimed in claim 1, characterized in that, The first housing has a receiving groove with a depth extending along the first direction, and the second housing covers the opening of the receiving groove to form the receiving cavity; the positioning structure is disposed on the outer edge of the opening and protrudes along the second direction toward a direction away from the opening.

3. The battery device as claimed in claim 1, characterized in that, The first housing has a first housing wall on the first side, and the positioning structure is connected to the first housing wall and extends continuously along the wall surface of the first housing wall; and / or, The first box has a second box wall on the second side, and the positioning structure is connected to the second box wall and extends continuously along the wall surface of the second box wall.

4. The battery device as claimed in claim 1, characterized in that, The first housing has a first housing wall on the first side, and the positioning structure is connected to the first housing wall and is distributed intermittently along the wall surface of the first housing wall; and / or, The first box has a second box wall on the second side, and the positioning structure is connected to the second box wall and is distributed intermittently along the wall surface of the second box wall.

5. The battery device according to any one of claims 1-4, characterized in that, The edging structure includes a first edging body and a second edging body connected to each other. The first edging body extends along the first direction. One end of the first edging body is connected to the second housing, and the other end of the first edging body is connected to the second edging body. The second edging body is arranged at a preset angle to the first edging body, and the second edging body extends toward the middle area of ​​the second housing, so that the first edging body, the second edging body, and the second housing together form a snap-fit ​​groove. The positioning structure is inserted into the snap-fit ​​groove.

6. The battery device as claimed in claim 5, characterized in that, The preset included angle is 90°, and along the second direction, the second edging body has a first preset width, which ranges from 1mm to 100mm.

7. The battery device as claimed in claim 5, characterized in that, The first box body also has a limiting groove, and the second edging body is inserted into the limiting groove.

8. The battery device as claimed in claim 5, characterized in that, The second housing has a third housing wall on the first side, and the edging structure is connected to the third housing wall and extends continuously along the wall surface of the third housing wall; and / or The second box has a fourth box wall on the second side, and the edging structure is connected to the fourth box wall and extends continuously along the wall surface of the fourth box wall.

9. The battery device according to any one of claims 1-4, characterized in that, The second housing has a third housing wall on the first side, and the edging structure is connected to the third housing wall and is distributed intermittently along the wall surface of the third housing wall; and / or The second box has a fourth box wall on the second side, and the edging structure is connected to the fourth box wall and is distributed intermittently along the wall surface of the fourth box wall.

10. The battery device as claimed in claim 1, characterized in that, The positioning structure and the edge-wrapping structure are interference-fitted.

11. The battery device as claimed in claim 1, characterized in that, The second enclosure is made of aluminum alloy or carbon steel.

12. The battery device as claimed in claim 1, characterized in that, In a third direction, the housing assembly has opposing third and fourth sides, with the first direction, the second direction, and the third direction being mutually perpendicular; the third side of the first housing is fixedly or detachably connected to the third side of the second housing; and / or The fourth side of the first housing and the fourth side of the second housing are fixedly or detachably connected.

13. The battery device as claimed in claim 1, characterized in that, The positioning structure is integrally formed on the first housing; and / or The edge-sealing structure is integrally formed on the second box body.

14. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-13, the battery device being used to store or provide electrical energy.

15. A method for preparing a battery device, characterized in that, The method is applied to the battery device as described in any one of claims 1-13, the method comprising: The second housing is subjected to a first heat treatment, causing the second housing to expand at least in the second direction; The second housing is pre-assembled with the first housing; The second housing is subjected to a second heat treatment, causing the second housing to shrink at least in the second direction, and the edge-sealing structure moves toward the positioning structure to insert with the positioning structure.

16. The method for preparing the battery device as described in claim 15, characterized in that, Along the second direction, the second housing has a second preset width; the edging structure includes a first edging body and a second edging body connected together, the first edging body extending along the first direction, one end of the first edging body connected to the second housing, the other end of the second edging body connected to the second housing, the second edging body and the first edging body arranged at a 90° angle, and the second edging body extending towards the central region of the second housing with a first preset width; the ratio of the first preset width to the second preset width is greater than 0 and less than or equal to 2.3 × 10⁻⁶. -3 .

17. The method for preparing the battery device as described in claim 15, characterized in that, The temperature difference between the first heat treatment and the second heat treatment is 150℃-250℃.

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