Battery device, energy storage device, energy storage system and power utilization device

Abstract

The utility model belongs to the technical field of battery production, and provides a battery device, an energy storage device, an energy storage system and a power utilization device.The battery device comprises a battery monomer assembly and a box body, the box body comprises a box body and a box cover, the box cover and the box body are connected and jointly define a containing space, and the battery monomer assembly is contained in the containing space; the box cover comprises a first flange structure, and a cavity is formed in the first flange structure. The utility model aims to improve the structural strength of the first flange structure on the premise of keeping the light weight of the first flange structure.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery device, energy storage device, energy storage system and power consumption device. Background Technology

[0002] Battery packs typically have an external casing, which includes a cover and a main body, with the cover fitting over the main body. The connection between the cover and the main body is usually a flange structure, and the thickness of this flange directly affects the reliability of the connection between the cover and the main body. Increasing the flange thickness tends to increase the overall weight of the cover, which is detrimental to the lightweight design of the battery pack. Utility Model Content

[0003] The purpose of this application is to provide a battery device, energy storage device, energy storage system and power consumption device, which aims to solve the technical problem of the conflict between the structural strength and lightweight of the flange structure when the cover and the body of the battery device are connected.

[0004] In a first aspect, this application provides a battery device, comprising:

[0005] Battery cell assembly;

[0006] The enclosure includes a main body and a cover. The cover is connected to the main body and together they enclose a space for housing, where the battery cell assembly is housed. The cover includes a first flange structure, and a cavity is formed inside the first flange structure.

[0007] In this embodiment, the cavity design can save materials and reduce the weight of the first flange structure. For a first flange structure of the same weight, the first flange structure with the cavity can have a greater thickness, thereby improving the rigidity and strength of the first flange structure. For a first flange structure of the same thickness, the first flange structure with the cavity saves more materials and is lighter, which is more beneficial for achieving lightweighting of the cover, body and battery device. In addition, the cavity can improve the mechanical properties of the first flange structure and increase its strength and rigidity.

[0008] In one embodiment, the first flange structure is arranged around a preset axis; the cavity is arranged around the preset axis.

[0009] In this embodiment, the surrounding shape of the cavity is made consistent with and matched with the surrounding shape of the first flange structure, which helps to reduce the internal stress caused by uneven flow of raw materials during the molding process of the first flange structure, thereby reducing the warping deformation caused by internal stress and making the dimensions of the first flange structure more stable.

[0010] In one embodiment, the mold cavity is provided with multiple cavities, and the extension axes of the multiple cavities are all located in the same plane perpendicular to the preset axis along the preset axis direction.

[0011] In this embodiment, the extension axes of multiple cavities are placed in the same plane perpendicular to a preset axis, thereby making the stress of the multiple cavities more balanced along the preset axis direction. This reduces the likelihood of warping during the fabrication of the first flange structure, resulting in greater dimensional stability. Furthermore, creating multiple cavities helps reduce the weight of the first flange structure, further facilitating the lightweighting of the cover and battery device.

[0012] In one embodiment, the first flange structure has a plurality of flange holes, which are spaced apart around a preset axis. The first flange structure has at least one cavity on the side of the flange hole closer to the preset axis; and / or, the first flange structure has at least one cavity on the side of the flange hole away from the preset axis; and / or, at least one cavity is formed between any two adjacent flange holes.

[0013] In this embodiment, by setting cavities on both sides of the flange hole near and away from the preset axis and between two adjacent flange holes, it is beneficial to balance the internal stress on both sides of the flange hole and balance the weight of the first flange structure on both sides of the flange hole, thereby reducing the warping deformation caused by internal stress and making the dimensions of the first flange structure more stable.

[0014] In one embodiment, the first flange structure has multiple flange holes, which are spaced apart around a preset axis. Along the extension direction of the cavity, the cavity bends and extends between two adjacent flange holes and is alternately located on both sides of the flange hole.

[0015] In this embodiment, the cavity is configured to bend and extend alternately between each pair of adjacent flange holes and on both sides, so that the stress between the two adjacent flange holes is balanced, the cavity and the flange holes have better encapsulation and fusion, and the cavity forms a larger extension length within the first flange structure, thereby enabling the cavity to reduce more material and facilitating the lightweighting of the cover and battery device.

[0016] In one embodiment, the first flange structure extends around a preset axis; the cavity includes multiple sub-cavities, which are spaced apart around the preset axis.

[0017] In this embodiment, the cavity adopts a method of arranging multiple sub-cavities at intervals, which makes the setting of the sub-cavities more flexible. The positions of the sub-cavities can be reasonably arranged according to the stress characteristics of the first flange structure, avoiding the weak positions of the structure, so as to improve the overall structural strength of the first flange structure.

[0018] In one embodiment, the cavity is filled with fluid.

[0019] In this embodiment, filling the cavity with fluid can improve the structural stability of the cavity and improve the forming effect of the flange surface.

[0020] In one embodiment, the cavity has a preset height along a preset axis, and the first flange structure has a preset thickness along a preset axis, with the preset height being 1%-95% of the preset thickness.

[0021] In this embodiment, the cavity is formed inside the first flange structure. The preset height of the cavity along the preset axis can be designed to be 1%-95% of the preset thickness of the first flange structure. The size design of the cavity can be more flexible. A larger preset height can increase the outer diameter of the cavity, which is beneficial to reducing the weight of the first flange structure and improving the forming effect of the flange surface.

[0022] In one embodiment, the cavity has a first width in a direction perpendicular to a preset axis, and the first flange structure has a second width in a direction perpendicular to the preset axis, wherein the first width is 1%-95% of the second width.

[0023] In this embodiment, the cavity is formed inside the first flange structure. The first width of the cavity along the direction perpendicular to the preset axis can be designed to be 1%-95% of the second width of the first flange structure. The size design of the cavity can be more flexible. A larger first width can increase the outer diameter of the cavity, which is beneficial to reducing the weight of the first flange structure and improving the forming effect of the flange surface.

[0024] In one embodiment, a connecting channel is formed inside the cover, which extends between the surface of the cavity and the first flange structure.

[0025] In this embodiment, the connecting channel is used to inject fluid into the cavity to improve the convenience of injecting fluid into the cavity.

[0026] In one embodiment, the lid includes a cover body and a frame body, the cover body having an edge portion, the frame body surrounding the cover body and connected to the edge portion; a first flange structure is formed on the frame body.

[0027] In this embodiment, the cover and frame can be prepared separately. By preparing them separately, lower-cost processing equipment can be used to prepare the cover and frame. The resulting cover and frame are then assembled. The production process of the box cover does not require the use of large equipment with high processing costs, which is beneficial to the processing difficulty and reduces the processing cost of the equipment, thereby reducing the production cost of the box cover and battery device.

[0028] In one embodiment, the frame includes a frame body and a first flange structure, the first flange structure being disposed around the frame body and connected to the frame body; the box also includes a locking structure, the locking structure being connected between the first flange structure and the box body.

[0029] In this embodiment, the frame is assembled with the box body through the first flange structure, and the frame and the box body are fixed through the locking structure. The edge part is connected and assembled with the frame body in the frame, so that the edge part can avoid the first flange structure and does not affect the connection and assembly of the first flange structure and the box body. The overall structural design is more reasonable.

[0030] In one embodiment, the first flange structure extends around a preset axis; the frame body includes a first support and a second support, the second support extends around the preset axis and is connected to the first flange structure, and the second support protrudes from the first flange structure in a direction parallel to the preset axis; the first support is connected to the protruding end of the second support, and the first support extends toward a direction close to the preset axis, and the first support is attached to and connected to the edge portion.

[0031] In this embodiment, the frame body is connected to the first flange structure through the second support body, and the first support body is connected to the edge portion, so that a certain pairing area or contact area is formed between the edge portion and the first support body, which helps to increase the connection strength between the first support body and the edge portion, improve the firmness of the connection between the cover and the frame body, and improve the resistance of the box cover to damage.

[0032] In one embodiment, the edges are connected to both the first support and the second support.

[0033] In this embodiment, the edge extends to the second support, so that the edge can be connected to the second support in addition to being connected to the first support. This increases the connection area between the edge and the frame body, which helps to enhance the connection strength between the edge and the frame body and improve the box cover's resistance to damage.

[0034] In one embodiment, the first flange structure has a flange face, and the edge portion includes a first edge sub-part and a second edge sub-part connected to the first edge sub-part. The first edge sub-part is attached to and connected to the frame body; the second edge sub-part is attached to and connected to the flange face.

[0035] In this embodiment, the edge portion can be connected to the frame body and the first flange structure at the same time, thereby increasing the connection area between the edge portion and the frame body. This is beneficial to improving the connection strength and bonding force between the cover and the frame body, improving the strength and resistance to damage of the cover, and reducing the creep of the flange surface.

[0036] In one embodiment, the first flange structure has a flange face, and the edge portion includes a first edge sub-part and a second edge sub-part connected to the first edge sub-part. The first edge sub-part is attached to and connected to both the first support and the second support. The second edge sub-part extends to the flange face and is attached to and connected to the flange face.

[0037] In this embodiment, the edge portion can be connected to the first support body and the second support body while also being connected to the first flange structure, thereby increasing the connection area between the edge portion and the frame, which helps to improve the connection strength between the cover and the frame, improve the strength and resistance to damage of the cover, and help to reduce the creep of the flange surface.

[0038] In one embodiment, the first flange structure extends around a preset axis; the frame body includes a second support body, which extends around the preset axis and is connected to the first flange structure. Along a direction parallel to the preset axis, the second support body protrudes from the first flange structure, and its edge is attached to and connected to the second support body.

[0039] In this embodiment, the second support body is attached to and connected to the edge, making the overall structure of the lid simpler and easier to manufacture.

[0040] In one embodiment, the first flange structure has a flange face, and the edge portion includes a first edge sub-part and a second edge sub-part connected to the first edge sub-part. The first edge sub-part is fitted and connected to the second support body, and the second edge sub-part is fitted and connected to the flange face.

[0041] In this embodiment, the edge portion can be connected to the first flange structure while being connected to the second support body, thereby increasing the connection area between the edge portion and the frame, which helps to improve the connection strength between the cover and the frame, improve the strength and resistance to damage of the cover, and help to reduce the creep of the flange surface.

[0042] In one embodiment, the frame is made of a non-metallic material.

[0043] In this embodiment, the non-metallic frame is lightweight, which helps to reduce the overall weight of the battery device. The frame and the cover are fitted together, and by forming a cavity inside the first flange structure during manufacturing, the deformation of the frame is reduced, and the forming effect and flatness of the flange surface of the first flange structure are improved.

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

[0045] Thirdly, this application provides an energy storage system, including a power conversion device and the aforementioned energy storage device, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0046] Fourthly, this application provides an electrical device, including a battery device, an energy storage device, or an energy storage system as described above, wherein the battery device is used to store or provide electrical energy.

[0047] Fifthly, this application provides a charging network, including a charging pile and the aforementioned energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0048] 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

[0049] 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.

[0050] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0051] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0052] Figure 3 This is a schematic diagram of the structure of the cover in a battery device provided in some embodiments of this application;

[0053] Figure 4 for Figure 3 AA section Figure 1 ;

[0054] Figure 5 for Figure 4 A magnified view of position C in the image;

[0055] Figure 6 for Figure 5 FF sectional view;

[0056] Figure 7 for Figure 3 BB sectional view Figure 1 ;

[0057] Figure 8 for Figure 7 A magnified view of position D in the image. Figure 1 ;

[0058] Figure 9 for Figure 7 A magnified view of position D in the image. Figure 2 ;

[0059] Figure 10 for Figure 9 EE section Figure 1 ;

[0060] Figure 11 for Figure 9 EE section Figure 2 ;

[0061] Figure 12 for Figure 7 A magnified view of position D in the image. Figure 3 ;

[0062] Figure 13 for Figure 3 Schematic diagram of three-dimensional structure Figure 1 ;

[0063] Figure 14 Schematic diagram of the structure of the frame in the battery device provided in some embodiments of this application Figure 1 ;

[0064] Figure 15 for Figure 3 BB sectional view Figure 2 ;

[0065] Figure 16 for Figure 15 A magnified view of position G in the image;

[0066] Figure 17 for Figure 3 AA section Figure 2 ;

[0067] Figure 18 for Figure 17 A magnified view of the J position in the image;

[0068] Figure 19 for Figure 3 Schematic diagram of three-dimensional structure Figure 2 ;

[0069] Figure 20 for Figure 3 BB sectional view Figure 3 ;

[0070] Figure 21 for Figure 20 A magnified view of the K position in the image;

[0071] Figure 22 for Figure 3 AA section Figure 3 ;

[0072] Figure 23 for Figure 22 A magnified view of the M position in the image;

[0073] Figure 24 Schematic diagram of the structure of the frame in the battery device provided in some embodiments of this application Figure 2 .

[0074] Explanation of reference numerals in the attached figures:

[0075] 1000. Vehicle; 1100. Battery assembly; 1110. Housing; 1120. Housing cover; 1121. Cover body; 11211. Edge portion; 11212. First edge sub-part; 11213. Second edge sub-part; 11214. Edge body; 11215. First plug-in structure; 1122. Frame; 11221. Frame body; 11222. First support body; 11223. Second support body; 11224. Edge portion; 11225. Second plug-in structure; 11226, First flange structure; 11227, Flange hole; 11228, Cavity; 11229, Sub-cavity; 1123, Connecting channel; 1130, Box body; 1131, Accommodation space; 1132, Locking structure; 1133, Preset axis; 1140, Battery cell assembly; 1200, Controller; 1300, Motor; H1, Preset height; H2, Preset thickness; L1, First width; L2, Second width. Detailed Implementation

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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).

[0082] 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.

[0083] 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.

[0084] A battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via busbars.

[0085] A battery device can be a battery pack, which generally includes a housing and one or more individual battery cells. The individual battery cells are housed within the housing, which encloses and protects them. Typically, the housing has a split structure, consisting of a cover and a body. The cover sits on top of the body, and together they form a storage space within which the individual battery cells are housed.

[0086] In related technologies, the part of the battery case lid that connects to the case body is usually a flange structure. The thickness of the flange structure directly affects the reliability of the connection between the lid and the case body. The greater the thickness of the flange structure, the higher the connection strength between the flange structure and the case body, and the more secure the connection between the lid and the case body. However, increasing the thickness of the flange structure will increase the weight of the flange structure itself, which in turn will increase the weight of the lid and the entire case body, which is not conducive to the lightweighting of the battery device.

[0087] Therefore, this application provides a battery device in which a cavity is formed inside the flange structure during the fabrication of the flange structure. The cavity can reduce the weight of the flange structure. Even when the thickness of the flange structure increases, the weight of the flange structure will not increase or will not increase excessively. This makes it difficult to increase the weight of the cover, which is beneficial to achieving lightweighting of the box body and the battery device. This solves the technical problem of the conflict between the connection strength of the flange structure and lightweighting when the cover is connected to the box body.

[0088] Specifically, refer to Figure 2 As shown in the illustration, this application provides a battery device 1100, which includes one or more battery cell assemblies 1140. The battery device 1100 disclosed in this application can be used in electrical devices that use the battery device 1100 as a power source or in various energy storage devices and 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. 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] Reference Figure 2-6 As shown, this application embodiment provides a battery device 1100, which includes a battery cell assembly 1140 and a housing 1110. The housing 1110 includes a housing body 1130 and a housing cover 1120. The housing cover 1120 is connected to the housing body 1130 and together forms an accommodating space 1131. The battery cell assembly 1140 is accommodated in the accommodating space 1131. The housing cover 1120 includes a first flange structure 11226, and a cavity 11228 is formed inside the first flange structure 11226.

[0093] For the battery cell assembly 1140, the battery cell assembly 1140 is usually formed by arranging multiple battery cells. Alternatively, the battery cell assembly 1140 can also be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0094] A battery cell refers to the smallest unit that makes up the battery device 1100. Each battery cell can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes.

[0095] For the housing 1110, the housing 1110 is used to provide a housing space 1131 for the battery cell assembly 1140, and the housing 1110 can adopt various structures. Specifically, the housing 1110 is used to house the battery cell assembly 1140, so the housing 1110 can include a cover 1120 and a body 1130. The cover 1120 and the body 1130 cover each other, and the cover 1120 and the body 1130 together define the housing space 1131 for accommodating the battery cell assembly 1140. The box body 1130 can be a hollow structure with one end open, and the box lid 1120 can be a plate-like structure. The box lid 1120 closes onto the open side of the box body 1130 so that the box lid 1120 and the box body 1130 together define the accommodating space 1131. Alternatively, both the box lid 1120 and the box body 1130 can be hollow structures with one side open, and the open side of the box lid 1120 closes onto the open side of the box body 1130. Of course, the box body 1110 formed by the box lid 1120 and the box body 1130 can be of various shapes, such as a cylinder, a cuboid, etc.

[0096] For the lid 1120, the lid 1120 includes a first flange structure 11226. The portion of the lid 1120 excluding the first flange structure 11226 can be defined as the main body of the lid 1120. The first flange structure 11226 is connected to the main body. The first flange structure 11226 is a structure for assembling the lid 1120 and the body 1130. The first flange structure 11226 is usually a ring-shaped plate structure. For example, the first flange structure 11226 is arranged around the circumference of the main body around a preset axis 1133 and connected to the main body. The first flange structure 11226 and the main body can be integrally formed. The first flange structure 11226 has a certain thickness, and the thickness direction of the first flange structure 11226 is the direction of the preset axis 1133.

[0097] A cavity 11228 is formed inside the first flange structure 11226. The cavity 11228 is a hollow space created inside the first flange structure 11226. The cavity 11228 can be formed during the fabrication of the first flange structure 11226. For example, the cavity 11228 can be formed during the fabrication of the first flange structure 11226 using a water-assisted injection molding process or a gas-assisted injection molding process. Alternatively, the cavity 11228 can be machined inside the first flange structure 11226 after it has been formed. There can be one or more cavities 11228. The extension shape of the cavities 11228 can be continuous or discontinuous. The cavities 11228 can be closed-loop connected or independent and non-connected. The cross-sectional outer contour shape of the cavity 11228 can be circular, elliptical, or polygonal, etc.

[0098] In this embodiment, the cavity 11228 can save materials and reduce the weight of the first flange structure 11226. For the same weight of the first flange structure 11226, the first flange structure 11226 with the cavity 11228 can have a larger thickness, thereby improving the rigidity and strength of the first flange structure 11226. For the same thickness of the first flange structure 11226, the first flange structure 11226 with the cavity saves more materials and is lighter, which is more beneficial to achieving the lightweighting of the cover 1120, the box body 1110 and the battery device 1100. In addition, the cavity 11228 can improve the mechanical properties of the first flange structure 11226 and improve the strength and rigidity of the first flange structure 11226.

[0099] In some embodiments, the first flange structure 11226 is injection molded. Then, the cavity 11228 can be prepared by water-assisted injection molding or air-assisted injection molding. During the injection molding process of the first flange structure 11226, high-pressure fluid is injected into the molten raw material by injection. The fluid causes the raw material to solidify and form the cavity 11228 inside the fluid.

[0100] In this embodiment, the cavity 11228 is prepared by water-assisted molding or air-assisted molding. The first flange structure 11226 formed by this method can reduce the internal stress generated by uneven flow of raw materials during molding, thereby reducing warping deformation caused by internal stress and making the dimensions of the first flange structure 11226 more stable. In addition, water-assisted molding or air-assisted molding can also reduce shrinkage and dents on the surface of the first flange structure 11226, improving the surface quality of the first flange structure 11226. Furthermore, the strength and rigidity of the first flange structure 11226 with cavity 11228 prepared by water-assisted molding or air-assisted molding can be further improved.

[0101] In some embodiments, refer to Figure 4 , Figure 7 and Figure 10 As shown, the first flange structure 11226 extends around the preset axis 1133; the cavity 11228 extends around the preset axis 1133.

[0102] Specifically, the first flange structure 11226 should be arranged in a ring shape, and the surrounding axis of the first flange structure 11226 is a preset axis 1133. It should be noted that the preset axis 1133 is a virtual axis, and the extension length (or height) of the first flange structure 11226 along the preset axis 1133 is the thickness of the first flange structure 11226. The surrounding shape of the first flange structure 11226 can be circular, elliptical, or polygonal, for example, rectangular.

[0103] Along the preset axis 1133, the first flange structure 11226 has a first flange face and a second flange face, which can be arranged opposite to each other. A cavity 11228 is formed inside the first flange structure 11226, and can be considered to be located between the first flange face and the second flange face. The shape of the cavity 11228 can match the surrounding shape of the first flange structure 11226. Specifically, the cavity 11228 extends around the preset axis 1133 to form an annular cavity. The cavity 11228 can be annularly continuous or non-continuous. The surrounding trajectory of the cavity 11228 can be circular, elliptical, or polygonal to match the extended shape of the first flange structure 11226.

[0104] In this embodiment, the surrounding shape of the cavity 11228 is made consistent with and matched with the surrounding shape of the first flange structure 11226, which helps to reduce the internal stress generated by uneven flow of raw materials during the molding process of the first flange structure 11226, thereby reducing the warping deformation caused by internal stress and making the dimensions of the first flange structure 11226 more stable.

[0105] In some embodiments, refer to Figure 4-6 As shown, there are multiple cavities 11228, and the extension axes of the multiple cavities 11228 are all located in the same plane perpendicular to the preset axis 1133.

[0106] Specifically, one or more cavities 11228 may be provided. When multiple cavities 11228 are provided, they can be arranged concentrically around a preset axis 1133. In the direction perpendicular to the preset axis 1133, the multiple cavities 11228 are spaced apart. The extension axis refers to the circumferential axis or circumferential trajectory line of the cavity 11228 when it surrounds the preset axis 1133. The extension axes of multiple cavities 11228 are all located in the same plane perpendicular to the preset axis 1133. This means that there is a plane perpendicular to the preset axis 1133, and the extension axes of multiple cavities 11228 are all located in this plane. In other words, multiple cavities 11228 are opened at the same thickness position in the thickness direction of the first flange structure 11226, so that the stress of the first flange structure 11226 in the direction perpendicular to the preset axis 1133 is more balanced, and the first flange structure 11226 is less prone to warping deformation during the manufacturing process, making the dimensions of the first flange structure 11226 more stable.

[0107] The cross-sectional (or cross-sectional) outer contour shapes of multiple cavities 11228 can be the same or different. For example, the cross-sectional outer contour shape of one cavity 11228 is circular, and the cross-sectional outer contour shape of another cavity 11228 is rectangular or elliptical, etc. The cross-sectional outer contour dimensions of multiple cavities 11228 can be the same or different. For example, the cross-sectional outer contour shapes of two cavities 11228 are both circular, and the diameters of the two cavities 11228 can be configured to be equal or unequal.

[0108] In this embodiment, the extension axes of the multiple cavities 11228 are located in the same plane perpendicular to the preset axis 1133, thereby making the stress of the multiple cavities 11228 more balanced in the direction along the preset axis 1133. This reduces the likelihood of warping during the fabrication of the first flange structure 11226, resulting in greater dimensional stability. Furthermore, the presence of multiple cavities 11228 helps reduce the weight of the first flange structure 11226, further contributing to the lightweighting of the cover 1120 and the battery device 1100.

[0109] In some embodiments, refer to Figure 6-10 and Figure 12 As shown, the first flange structure 11226 has a plurality of flange holes 11227, which are spaced apart around a preset axis 1133. The first flange structure 11226 has at least one cavity 11228 on the side of the flange hole 11227 close to the preset axis 1133; and / or, the first flange structure 11226 has at least one cavity 11228 on the side of the flange hole 11227 away from the preset axis 1133; and / or, at least one cavity 11228 is formed between any two adjacent flange holes 11227.

[0110] Specifically, a flange hole 11227 is typically provided along the thickness direction of the first flange structure 11226. The flange hole 11227 can be a through hole or a bolt hole. The thickness direction of the first flange structure 11226 should be understood as being parallel to the preset axis 1133 described below. It can be understood that the flange hole 11227 is a through hole or bolt hole passing between the first flange face and the second flange face of the first flange structure 11226. The flange hole 11227 is generally a circular hole. The flange hole 11227 is used for threading (or plugging) locking structures 1132, etc. For example, a bolt structure can be threaded into the flange hole 11227. Multiple flange holes 11227 can be configured, and the multiple flange holes 11227 are arranged around the preset axis 1133 and spaced apart.

[0111] The first flange structure 11226 forms two solid parts on the side of the flange hole 11227 that is close to the preset axis 1133 and on the side that is far from the preset axis 1133. For ease of description, the solid part of the first flange structure 11226 on the side of the flange hole 11227 that is close to the preset axis 1133 can be defined as the first part, and the solid part of the first flange structure 11226 on the side of the flange hole 11227 that is far from the preset axis 1133 can be defined as the second part.

[0112] Multiple cavities 11228 are configured, wherein at least one cavity 11228 is located on the side of the flange hole 11227 near the preset axis 1133. That is, at least one cavity 11228 is formed in the first part of the first flange structure 11226. There may be multiple cavities 11228 formed in the first part, and the multiple cavities 11228 may be spaced apart or connected to each other.

[0113] At least one cavity 11228 is located on the side of the flange hole 11227 away from the preset axis 1133. That is, at least one cavity 11228 is formed in the second part of the first flange structure 11226. There may be multiple cavities 11228 formed in the second part, and the multiple cavities 11228 may be spaced apart or connected. The cavities 11228 located in the first part and the cavities 11228 located in the second part may be connected or spaced apart.

[0114] Alternatively, in another possible approach, at least one cavity 11228 may be configured between any two adjacent flange holes 11227, and the multiple cavities 11228 may be arranged in a phase-separated manner.

[0115] The three arrangement methods of cavity 11228 described above can be combined arbitrarily, making the arrangement of cavity 11228 more flexible.

[0116] In this embodiment, by providing cavities 11228 on both sides of the flange hole 11227 near and away from the preset axis 1133, and between any two flange holes 11227, it is beneficial to balance the internal stress on both sides of the flange hole 11227 and balance the weight of the first flange structure 11226 on both sides of the flange hole 11227, thereby reducing warping deformation caused by internal stress and making the dimensions of the first flange structure 11226 more stable.

[0117] In some embodiments, refer to Figure 9 and Figure 11As shown, the first flange structure 11226 has multiple flange holes 11227. The multiple flange holes 11227 are arranged at intervals around the preset axis 1133. Along the extension direction of the cavity 11228, the cavity 11228 bends and extends between two adjacent flange holes 11227 and is alternately located on both sides of the flange hole 11227.

[0118] Specifically, multiple flange holes 11227 are spaced apart, and a solid portion is formed between two adjacent flange holes 11227. This solid portion is defined as the third part. The extension direction of the cavity 11228 is the circumferential direction of the cavity 11228 around the preset axis 1133. The cavity 11228 extends and forms an extension trajectory. The extension trajectory of the cavity 11228 is curved. The cavity 11228 extends curvedly through the first part of a flange hole 11227 near the preset axis 1133, and then through the flange hole 112227. The cavity 11228 extends from the third part between the flange hole 11227 and the third part between the flange hole 11227 and the flange hole 11227 adjacent to the flange hole 11227, and then through the second part opposite to the side of the adjacent flange hole 11227 away from the preset axis 1133. The cavity 11228 continues to extend to the third part and the first part, and so on, so that the cavity 11228 bends and extends between the two adjacent flange holes 11227 and is alternately arranged on both sides of the flange hole 11227, so that the outside of the cavity 11228 presents a reciprocating bending and extending shape, such as a snake shape, an S shape, etc.

[0119] In this embodiment, the cavity 11228 is configured to be alternately bent and extended between each pair of adjacent flange holes 11227 and on both sides, so that the stress between the two adjacent flange holes 11227 is balanced, the cavity 11228 and the flange holes 11227 have better encapsulation and fusion, and the cavity 11228 forms a larger extension length within the first flange structure 11226, thereby enabling the cavity 11228 to reduce more material, which is beneficial to achieving the lightweighting of the cover 1120 and the battery device 1100.

[0120] In some embodiments, refer to Figure 5 and Figure 6 As shown, the first flange structure 11226 extends around the preset axis 1133; the cavity 11228 includes multiple sub-cavities 11229, which are spaced apart around the preset axis 1133.

[0121] Specifically, one or more cavities 11228 may be provided, and each cavity 11228 includes multiple sub-cavities 11229. Each sub-cavity 11229 may be spherical or extend into a strip shape. The multiple sub-cavities 11229 are spaced apart and are spaced around a preset axis 1133. For example, the cavity 11228 includes multiple sub-cavities 11229 that extend into a strip shape. The extension trajectory of each sub-cavity 11229 is located in the same plane perpendicular to the preset axis 1133, thereby making the cavity 11228 form a discontinuously extended ring shape.

[0122] For example, the side of the flange hole 11227 near the preset axis 1133 and the side of the flange hole 11227 away from the preset axis 1133 may not have a sub-cavity 11229. The sub-cavity 11229 may be opened on the side of the solid part between two adjacent flange holes 11227 near the preset axis 1133 or away from the preset axis 1133, so that the sub-cavity 11229 can avoid the weak area after the flange hole 11227 is opened.

[0123] In this embodiment, the cavity 11228 adopts a multiple sub-cavities 11229 arranged at intervals, which makes the arrangement of the sub-cavities 11229 more flexible. The position of the sub-cavities 11229 can be reasonably arranged according to the stress characteristics of the first flange structure 11226, avoiding the weak position of the structure, so as to improve the overall structural strength of the first flange structure 11226.

[0124] In some embodiments, the cavity 11228 is filled with fluid.

[0125] Specifically, the fluid can be a gas or a liquid. Gases can be air, inert gases, etc., and liquids can be water, etc. The fluid filling the cavity 11228 provides support. For example, the cavity 11228 is a closed cavity. When the fluid is filled into the cavity 11228, a certain pressure is created, resulting in a supporting force within the cavity 11228 and the fluid inside. This helps improve the strength and rigidity of the first flange structure 11226, improves the forming effect of the flange surface, and reduces the occurrence of defects such as dents and unevenness.

[0126] In this embodiment, by filling the cavity 11228 with fluid, the structural stability of the cavity 11228 can be improved, and the forming effect of the flange surface can be improved.

[0127] In some embodiments, refer to Figure 5 As shown, the cavity 11228 has a preset height H1 along the preset axis 1133, and the first flange structure 11226 has a preset thickness H2 along the preset axis 1133. The preset height H1 is 1%-95% of the preset thickness H2.

[0128] Along the preset axis 1133, the first flange structure 11226 has two opposing flange faces, and the distance between the two flange faces is the thickness of the first flange structure 11226. A cavity 11228 is formed between these two flange faces, and the preset height H1 of the cavity 11228 is the opening length of the cavity 11228 along the preset axis 1133, which is the length of the cavity 11228 between the two flange faces. For example, if the cross-sectional outer contour of the cavity 11228 is circular, then the diameter of the cavity 11228 is the preset height H1 of the cavity 11228 along the preset axis 1133.

[0129] The preset height H1 is set to be 1%-95% of the preset thickness H2. For example, the ratio of preset height H1 to preset thickness H2 is defined as the percentage height, which can be any value between 1% and 95%, such as 1%, 10%, 20%, 50%, 80%, 95%, etc. A larger percentage height results in a larger opening of the cavity 11228 along the preset axis 1133, a larger space occupied by the cavity 11228 within the first flange structure 11226, and a lighter weight for the first flange structure 11226. Furthermore, a larger opening of the cavity 11228 and its closer proximity to the flange face facilitate stress balancing on the flange face during molding, improving stress uniformity and thus enhancing the molding effect of the flange face.

[0130] In this embodiment, the cavity 11228 is formed inside the first flange structure 11226. The preset height H1 of the cavity 11228 along the preset axis 1133 can be designed to be 1%-95% of the preset thickness H2 of the first flange structure 11226. The size design of the cavity 11228 can be more flexible. A larger preset height H1 can increase the outer diameter of the cavity 11228, which is beneficial to reduce the weight of the first flange structure 11226 and improve the forming effect of the flange surface.

[0131] In some embodiments, refer to Figure 5 As shown, the cavity 11228 has a first width L1 in the direction perpendicular to the preset axis 1133, and the first flange structure 11226 has a second width L2 in the direction perpendicular to the preset axis 1133. The first width L1 is 1%-95% of the second width L2.

[0132] Specifically, for cavity 11228, the direction of the preset axis 1133 can be considered as the height direction of cavity 11228, and the direction perpendicular to the preset axis 1133 can be considered as the width direction. Thus, cavity 11228 has a first width L1 in the width direction. Similarly, the first flange structure 11226 also has a second width L2 in the width direction. The first width L1 can be 1%-95% of the second width L2. For example, the first width L1 can be any value between 1% and 95% of the second width L2, such as 1%, 10%, 20%, 50%, 80%, or 95% of the second width L2. The larger this value, the larger the opening of the cavity 11228 in the direction perpendicular to the preset axis 1133, the larger the space occupied by the cavity 11228 inside the first flange structure 11226, and the lighter the weight of the first flange structure 11226. In addition, the larger the opening of the cavity 11228, the closer the cavity 11228 is to the circumferential outer side of the first flange structure 11226, which is more conducive to balancing the stress on the flange surface during molding, improving the stress balance, and thus improving the molding effect of the flange surface.

[0133] In this embodiment, the cavity 11228 is formed inside the first flange structure 11226. The first width L1 of the cavity 11228 along the direction perpendicular to the preset axis 1133 can be designed to be 1%-95% of the second width L2 of the first flange structure 11226. The size design of the cavity 11228 can be more flexible. A larger first width L1 can increase the outer diameter of the cavity 11228, which is beneficial to reduce the weight of the first flange structure 11226 and improve the forming effect of the flange surface.

[0134] In some embodiments, refer to Figure 8 , Figure 9 and Figure 12 As shown, a connecting channel 1123 is formed inside the box cover 1120, and the connecting channel 1123 passes through the surface between the cavity 11228 and the first flange structure 11226.

[0135] The surface of the first flange structure 11226 includes a flange face and a circumferential outer surface located between the two flange faces. A connecting channel 1123 connects the cavity 11228 and the surface of the first flange structure 11226, thereby allowing the cavity 11228 to communicate with the external space of the first flange structure 11226. This facilitates the injection of fluid into the cavity 11228 from the outside through the connecting channel 1123, which serves as the channel for injecting fluid into the cavity 11228. An opening is formed in the connecting channel 1123 on the surface of the first flange structure 11226, and this opening can be closed when no fluid injection is being performed.

[0136] The outer diameter of the connecting channel 1123 can range from 0.1mm to 60mm. For example, if the cross-sectional profile of the connecting channel 1123 is circular, then the outer diameter of the connecting channel 1123 is the diameter of the circle. The outer diameter of the connecting channel 1123 can be any value between 0.1mm and 60mm, such as 10mm, 20mm, 30mm, 40mm, 50mm, etc. The larger the outer diameter, the easier it is to inject fluid into the connecting channel 1123, and the faster the injection speed; the smaller the outer diameter, the less likely the fluid in the cavity 11228 will leak out.

[0137] One or more connecting channels 1123 may be provided. When the cavity 11228 includes multiple sub-cavities 11229, each sub-cavity 11229 may be connected to a connecting channel 1123.

[0138] In this embodiment, the connecting channel 1123 is used to inject fluid into the cavity 11228 to improve the convenience of injecting fluid into the cavity 11228.

[0139] In some embodiments, refer to Figure 13-16 As shown, the box cover 1120 includes a cover body 1121 and a frame body 1122. The cover body 1121 has an edge portion 11211, and the frame body 1122 is disposed around the cover body 1121 and connected to the edge portion 11211. A first flange structure 11226 is formed on the frame body 1122.

[0140] For the box lid 1120, the box lid 1120 includes a lid body 1121 and a frame 1122. The lid body 1121 forms the middle part of the box lid 1120. The lid body 1121 can be made of sheet metal or injection molded. The lid body 1121 can be made of non-metallic materials such as plastic, composite materials, mica, and ceramic. Of course, the lid body 1121 can also be made of metallic materials, such as iron, aluminum, stainless steel, and mica sheet.

[0141] Among them, combined Figure 15 and Figure 16As shown, the frame 1122 is a ring-shaped frame structure, surrounding the cover 1121 to enclose its outer perimeter. The cover 1121 has an edge portion 11211 near its edge, which is ring-shaped and can be continuous or discontinuous. The frame 1122 surrounds the cover 1121 and connects to the edge portion 11211. For example, a ring-shaped connecting plate is formed on the frame 1122, and the edge portion 11211 fits or interlocks with the connecting plate, thus creating a sufficient contact area between the edge portion 11211 and the frame 1122. The frame 1122 can be fabricated using a plate structure or as an injection-molded part. The frame 1122 can be made of metal or non-metal materials. For example, the frame 1122 can be made of non-metal materials such as plastic, composite materials, mica, and ceramics. Alternatively, the frame 1122 can also be made of materials such as iron, aluminum, and stainless steel.

[0142] There are several ways to connect the edge portion 11211 to the frame 1122. For example, the frame 1122 and the edge portion 11211 can be connected by injection molding; or the frame 1122 and the edge portion 11211 can be connected by melting, forming a fused joint; or the frame 1122 and the edge portion 11211 can be bonded with an adhesive; or the frame 1122 and the edge portion 11211 can be welded together; or the frame 1122 and the edge portion 11211 can be connected by bolts, riveting, etc. Of course, the frame 1122 and the edge portion 11211 can also be connected by one or more of the above methods in combination.

[0143] For example, when manufacturing the lid 1120, the lid body 1121 can be placed into the injection mold first, then the mold can be closed, and the raw material for manufacturing the frame 1122 can be injected into the mold cavity, so that the raw material for the frame 1122 and the lid body 1121 are fused together. The frame 1122 and the lid 1121 are then cooled and shaped, and the mold can be opened to remove the molded lid 1120. Alternatively, the mold can be closed first, the raw material for manufacturing the frame 1122 can be injected into the mold cavity, then cooled and shaped, and the mold can be opened to form the frame 1122. The frame 1122 can then be bonded or welded to the lid 1121.

[0144] For the first flange structure 11226, the first flange structure 11226 can be part of the frame 1122. The first flange structure 11226 can be formed during the preparation of the frame 1122. The flange hole 11227 can be formed by machining.

[0145] In this embodiment, the lid 1120 in the housing 1110 is a combination of a lid 1121 and a frame 1122, allowing the lid 1121 and frame 1122 to be manufactured separately. This separate manufacturing method allows for the use of lower-cost processing equipment to complete the production of the lid 1121 and frame 1122. The resulting lid 1121 and frame 1122 are then connected. The production of the lid 1120 does not require large, expensive equipment, which reduces processing difficulty and equipment costs, thereby lowering the production costs of the lid 1120 and the battery device 1100. When manufacturing the housing 1110, only the frame 1122 needs to be injection molded. When molding the lid 1120, only the frame 1122 requires clamping force; the lid 1121 does not. This significantly reduces the tonnage of the injection molding machine required to manufacture the lid 1120, thus lowering manufacturing costs.

[0146] In some embodiments, the thickness of the cover 1121 can range from 0.05mm to 50mm, and the frame 1122 can be fabricated as a plate structure with a thickness of 0.05mm to 50mm. The frame 1122 can be made of plastic. A mating surface can be formed between the cover 1121 and the frame 1122, and the width of this mating surface can be 0% to 50% of the width of the cover 1121. For example, the cover 1121 can adopt a thin-walled structure, so that the thickness of the cover 1121 can reach 0.1mm, thereby reducing costs. The cover 1121 can also have concave-convex structures or indented structures to enhance its structural strength.

[0147] In some embodiments, refer to Figure 2 and Figure 13-16 As shown, the frame 1122 includes a frame body 11221 and a first flange structure 11226. The first flange structure 11226 is arranged around the frame body 11221 and connected to the frame body 11221. The box 1110 also includes a locking structure 1132, which is connected between the first flange structure 11226 and the box body 1130.

[0148] Specifically, the frame body 11221 in the frame 1122 is connected to the first flange structure 11226. The frame body 11221 is located on the side of the first flange structure 11226 near the center. That is, the first flange structure 11226 surrounds the outer periphery of the frame body 11221 and is connected to the frame body 11221. The frame body 11221 and the first flange structure 11226 can be fixedly connected or detachably connected. For example, the frame body 11221 and the first flange structure 11226 can be connected by welding, bolting, riveting, or the frame body 11221 and the first flange structure 11226 can be integrally formed.

[0149] The side of the frame body 11221 near the edge portion 11211 is connected to the edge portion 11211. For example, a connecting plate extends outward from the frame body 11221 toward the edge portion 11211. The connecting plate is ring-shaped, and the edge portion 11211 is attached to the surface of the connecting plate and connected to the connecting plate. The frame body 11221 and the edge portion 11211 can be injection molded into an integral structure.

[0150] The housing body 1130 typically has a structure that mates with the first flange structure 11226. Generally, the frame body 11221 is provided with a corresponding opposing flange that matches the first flange structure 11226. Corresponding to the flange hole 11227 on the first flange structure 11226, the opposing flange has a corresponding flange hole, allowing the first flange structure 11226 and the opposing flange to fit together. A locking structure 1132 connects the first flange structure 11226 and the opposing flange, thereby achieving a connection and fixation between the housing cover 1120 and the housing body 1130. The locking structure 1132 can be a bolt assembly, etc., thereby achieving a detachable connection between the housing cover 1120 and the housing body 1130.

[0151] In this embodiment, the frame 1122 is assembled with the box body 1130 through the first flange structure 11226, and the frame 1122 and the box body 1130 are fixed through the locking structure 1132. The edge portion 11211 is connected and assembled with the frame body 11221 in the frame 1122, so that the edge portion 11211 can avoid the first flange structure 11226 and does not affect the connection and assembly of the first flange structure 11226 and the box body 1130. The overall structural design is more reasonable.

[0152] In some embodiments, refer to Figure 13-16As shown, the first flange structure 11226 extends around the preset axis 1133; the frame body 11221 includes a first support body 11222 and a second support body 11223. The second support body 11223 extends around the preset axis 1133 and is connected to the first flange structure 11226. The second support body 11223 protrudes from the first flange structure 11226 in a direction parallel to the preset axis 1133. The first support body 11222 is connected to the protruding end of the second support body 11223, and the first support body 11222 extends toward the preset axis 1133. The first support body 11222 is attached to and connected to the edge portion 11211.

[0153] The preset axis 1133 is a virtual axis, which is set to facilitate the description of the relative positional relationship between the first support 11222, the second support 11223 and the first flange structure 11226.

[0154] In the frame body 11221, the second support body 11223 is arranged around a preset axis 1133, thus the second support body 11223 is a ring structure. The second support body 11223 is connected to the first flange structure 11226, which has an inner ring side and an outer ring side. The second support body 11223 can be connected to the inner ring side of the first flange structure 11226. The second support body 11223 extends in a direction parallel to the preset axis 1133 and protrudes from one side of the first flange structure 11226. It can be considered that the second support body 11223 forms a certain protrusion height on one side of the first flange structure 11226. The second support body 11223 has a certain thickness in a direction perpendicular to the preset axis 1133. When the thickness of the second support body 11223 is less than the protrusion height, it can be considered that the second support body 11223 is a plate structure; of course, the thickness of the second support body 11223 can also be greater than or equal to the protrusion height.

[0155] The second support 11223 extends from the position connected to the first flange structure 11226 in a direction away from the first flange structure 11226 and forms an extension end. The first support 11222 is connected to this extension end. The first support 11222 extends from the position connected to the second support 11223 in a direction close to the preset axis 1133, that is, towards the center of the box cover 1120, so that the first support 11222 protrudes from the side of the second support 11223 near the center. It can be seen that the first support 11222 is also a ring structure around the preset axis 1133. Along a direction perpendicular to the preset axis 1133, the first support body 11222 has a certain extension width. Along the preset axis 1133, the first support body 11222 may have a certain thickness. When the thickness of the first support body 11222 is less than the extension width, it can be considered a plate structure. Of course, the thickness of the first support body 11222 can also be greater than or equal to the extension width. Then, the first support body 11222 and the second support body 11223 can be connected to form a bent shape. The first support body 11222 and the second support body 11223 can be fixedly or detachably connected. For example, the first support body 11222 and the second support body 11223 can be connected by welding or bolting, or they can be integrally molded.

[0156] The first support 11222 has a first connecting surface, which is a plane that fits and connects with the edge portion 11211. Therefore, it can be seen that the first connecting surface is parallel to the surface of the edge portion 11211. For example, the first connecting surface is a plane perpendicular to the preset axis 1133. The surface of the edge portion 11211 is opposite to and parallel to the first connecting surface. The edge portion 11211 is fitted and connected to the first connecting surface. A certain pairing or contact area is formed between the edge portion 11211 and the first support 11222. The edge portion 11211 and the first support 11222 can be connected by one or more of the above-mentioned injection molding, melting, welding, bonding and other methods.

[0157] In this embodiment, the frame body 11221 is connected to the first flange structure 11226 via the second support body 11223, and to the edge portion 11211 via the first support body 11222. This creates a certain pairing area or contact area between the edge portion 11211 and the first support body 11222, thereby increasing the connection strength between the first support body 11222 and the edge portion 11211, improving the firmness of the connection between the cover 1121 and the frame body 1122, and enhancing the resistance of the box cover 1120 to damage.

[0158] In some embodiments, refer to Figure 17 and Figure 18 As shown, the edge portion 11211 is connected to the first support body 11222 and the second support body 11223.

[0159] Specifically, the second support 11223 forms a second connecting surface on the side opposite to the preset axis 1133. The second connecting surface is a surface on the second support 11223. The second connecting surface is located on the side of the second support 11223 opposite to the preset axis 1133. Since the second support 11223 extends around the preset axis 1133, the second connecting surface can be the outer ring surface of the second support 11223. The outer ring surface is a continuous or discontinuous annular surface. For example, if the second support 11223 is cylindrical, then the second connecting surface is the outer cylindrical surface or the outer cylindrical surface.

[0160] The edge portion 11211 can extend to the first connecting surface and also to the second connecting surface, and is attached and connected to the first connecting surface and the second connecting surface respectively. The edge portion 11211 can cover all or part of the first connecting surface and the edge portion 11211 can also cover all or part of the second connecting surface. It can be seen that the edge portion 11211 can cover the first support body 11222 and the second support body 11223, and form a certain contact area with the first support body 11222 and the second support body 11223.

[0161] The edge portion 11211 and the frame body 11221 can also be connected by one or more of the above-mentioned injection molding, melting, welding, bonding and other methods. Using the above methods can increase the connection strength between the edge portion 11211 and the frame body 11221.

[0162] In this embodiment, the edge portion 11211 extends to the second support body 11223, so that the edge portion 11211 can be connected to the second support body 11223 in addition to being connected to the first support body 11222. This increases the connection area between the edge portion 11211 and the frame body 11221, which helps to enhance the connection strength between the edge portion 11211 and the frame body 11221 and improve the damage resistance of the box cover 1120.

[0163] In some embodiments, refer to Figure 17 and Figure 18 As shown, the second support 11223 is plate-shaped.

[0164] Specifically, the second support 11223 is fabricated using a plate structure (plate-like structure), forming a cylindrical structure. The preset axis 1133 is the central axis of the cylindrical structure. The first flange structure 11226 is connected to one end of the cylindrical structure, and the first support 11222 is connected to the other end of the cylindrical structure. The outer ring surface or outer surface of the cylindrical structure is the second connecting surface. The second support 11223 and the first flange structure 11226 can be integrally fabricated.

[0165] In this embodiment, the second support 11223 is made of a plate-like structure, which is easy to manufacture and helps to reduce the weight of the cover 1120, thus helping to achieve the lightweighting of the battery device 1100.

[0166] In some embodiments, refer to Figure 17 and Figure 18 As shown, the first support 11222 is plate-shaped.

[0167] Specifically, the first support 11222 is fabricated using a plate structure (plate-like structure), forming a sheet-like structure. The plate surface of the first support 11222 can be perpendicular to the preset axis 1133. That is, the first support 11222 and the second support 11223 can be connected perpendicularly. The first support 11222 and the second support 11223 are connected and form a vertical bend. For example, the frame body 11221 has an L-shaped cross-sectional profile in a direction parallel to the preset axis 1133. The first connecting surface can be the upper surface of the first support 11222. Along the preset axis 1133, the first support 11222 can be considered to be located above the second support 11223, and the first flange structure 11226 is located below the second support 11223. The second support 11223 can be integrally formed with the first support 11222.

[0168] In this embodiment, the first support 11222 is made with a plate-like structure, which facilitates its integral fabrication with the second support 11223 and helps to reduce the weight of the cover 1120, thus contributing to the lightweighting of the battery device 1100.

[0169] In some embodiments, refer to Figure 17 , Figure 18 , Figure 22 and Figure 23 As shown, the first flange structure 11226 has a flange face, and the edge portion 11211 includes a first edge sub-part 11212 and a second edge sub-part 11213 connected to the first edge sub-part 11212. The first edge sub-part 11212 is attached to and connected to the frame body 11221; the second edge sub-part 11213 is attached to and connected to the flange face.

[0170] For ease of description, the preset axis 1133 is set as the vertical axis. Then, the flange face can be the upper or lower surface of the first flange structure 11226. When the flange face is the lower surface, it can be seen that the edge portion 11211 is connected to the lower surface of the frame body 11221 (that is, the lower surface of the first support 11222 and the inner surface of the second support 11223 on the side close to the preset axis 1133). In this example, the flange face is taken as the upper surface for explanation. Then, it can be seen that the edge portion 11211 is connected to the upper surface of the frame body 11221 (that is, the upper surface of the first support 11222 and the outer surface of the second support 11223 on the side away from the preset axis 1133).

[0171] For the edge portion 11211, the edge portion 11211 is divided into two connected parts, namely a first edge sub-part 11212 and a second edge sub-part 11213. The first edge sub-part 11212 is connected to the frame body 11221, and the second edge sub-part 11213 is connected to the first flange structure 11226. The first edge sub-part 11212 is in contact with and connected to the surface of the frame body 11221, thereby forming a certain connection area between the first edge sub-part 11212 and the frame body 11221. The second edge sub-part 11213 is in contact with and connected to the flange surface, thereby forming a certain connection area between the second edge sub-part 11213 and the first flange structure 11226. The first edge sub-part 11212 and the second edge sub-part 11213 can be an integrally formed plate structure.

[0172] The first edge sub-part 11212 and the frame body 11221, as well as the second edge sub-part 11213 and the first flange structure 11226, can be connected by one or more of the above-mentioned injection molding, melting, welding, and bonding methods. It should be noted that the second edge sub-part 11213 must avoid the flange hole 11227 opened on the first flange structure 11226 so that the second edge sub-part 11213 can avoid the locking structure 1132.

[0173] In this embodiment, the edge portion 11211 can be connected to the frame body 11221 and the first flange structure 11226 at the same time, thereby increasing the connection area between the edge portion 11211 and the frame body 1122. This is beneficial to improving the connection strength and bonding force between the cover 1120 and the frame body 1122, improving the strength and resistance to damage of the cover 1120, and reducing the creep of the flange surface.

[0174] In some embodiments, refer to Figure 17 and Figure 18As shown, the first flange structure 11226 has a flange face, and the edge portion 11211 includes a first edge sub-part 11212 and a second edge sub-part 11213 connected to the first edge sub-part 11212. The first edge sub-part 11212 is attached to and connected to the first support body 11222 and the second support body 11223. The second edge sub-part 11213 extends to the flange face and is attached to and connected to the flange face.

[0175] The structural forms of the first flange structure 11226, the first edge sub-part 11212, and the second edge sub-part 11213 can be referred to in the above embodiments, and will not be repeated here. For the frame body 11221 including the first support body 11222 and the second support body 11223, the first edge sub-part 11212 extends in contact with the first connecting surface and the second connecting surface to achieve the purpose of contacting and connecting with the first support body 11222 and the second support body 11223; the second edge sub-part 11213 extends in contact with the flange surface to achieve the purpose of contacting and connecting with the first flange structure 11226.

[0176] At least one of the following can be connected by a combination of one or more of the above-mentioned methods, such as injection molding, melting, welding, and bonding: between the first edge sub-part 11212 and the first support body 11222, between the first edge sub-part 11212 and the second support body 11223, and between the second edge sub-part 11213 and the first flange structure 11226. It should be noted that the second edge sub-part 11213 must avoid the flange hole 11227 opened on the first flange structure 11226 so that the second edge sub-part 11213 can avoid the locking structure 1132.

[0177] In this embodiment, the edge portion 11211 can be connected to the first support body 11222 and the second support body 11223, and can also be connected to the first flange structure 11226, thereby increasing the connection area between the edge portion 11211 and the frame 1122. This helps to improve the connection strength between the cover 1120 and the frame 1122, improve the strength and resistance to damage of the cover 1120, and help to reduce the creep of the flange surface.

[0178] In some embodiments, refer to Figure 22 and Figure 23 As shown, the first flange structure 11226 extends around the preset axis 1133; the frame body 11221 includes a second support body 11223, which extends around the preset axis 1133 and is connected to the first flange structure 11226. Along a direction parallel to the preset axis 1133, the second support body 11223 protrudes from the first flange structure 11226, and the edge portion 11211 is attached to and connected to the second support body 11223.

[0179] In this example, for the frame body 11221, combined with Figure 24 As shown, the frame body 11221 includes a second support 11223, but does not include the first support 11222 in the above example. The structure of the second support 11223 is the same as that in the above embodiment. The second support 11223 is arranged in a ring shape around a preset axis 1133. The second support 11223 is connected to the first flange structure 11226. The first flange structure 11226 has an inner ring side and an outer ring side. The second support 11223 can be connected to the inner ring side of the first flange structure 11226. The second support 11223 extends in a direction parallel to the preset axis 1133 and protrudes from one side of the first flange structure 11226.

[0180] Since the second support 11223 has a ring-shaped structure, it can be seen that the second support 11223 has an inner ring surface and an outer ring surface. The side closer to the preset axis 1133 is called the inner side, and the side farther from the preset axis 1133 is called the outer side. The second support 11223 forms a second connecting surface on the side opposite to the preset axis 1133. Therefore, the second connecting surface can refer to the inner ring surface, or it can refer to the outer ring surface. The edge portion 11211 of the cover 1121 extends to the second connecting surface and fits against the second connecting surface, connecting the edge portion 11211 and the second support 11223. The connection method can also adopt one or more of the above-mentioned injection molding, melting, welding, bonding and other methods in combination. It can be seen that the edge portion 11211 is perpendicular to the other parts of the cover 1121, and the other parts of the cover 1121 are the middle part of the cover 1121 surrounded by the edge portion 11211.

[0181] In this embodiment, the frame body 11221 encloses the second support body 11223, the second support body 11223 is attached to the edge portion 11211, and the edge portion 11211 is connected to the second support body 11223, making the overall structure of the box cover 1120 simpler and easier to manufacture.

[0182] In some embodiments, refer to Figure 22 and Figure 23 As shown, the second support 11223 is plate-shaped.

[0183] Specifically, the second support 11223 is fabricated using a plate-like structure, forming a cylindrical structure. The preset axis 1133 is the central axis of the cylindrical structure, and the first flange structure 11226 is connected to one end of the cylindrical structure. The outer ring surface or outer surface of the cylindrical structure is the second connecting surface. The second support 11223 and the first flange structure 11226 can be integrally fabricated.

[0184] In this embodiment, the second support 11223 is made of a plate-like structure, which is easy to manufacture and helps to reduce the weight of the cover 1120, thus helping to achieve the lightweighting of the battery device 1100.

[0185] In some embodiments, refer to Figure 22 and Figure 23 As shown, the first flange structure 11226 has a flange face, and the edge portion 11211 includes a first edge sub-part 11212 and a second edge sub-part 11213 connected to the first edge sub-part 11212. The first edge sub-part 11212 is fitted and connected to the second support body 11223, and the second edge sub-part 11213 is fitted and connected to the flange face.

[0186] Similarly, the edge portion 11211 is divided into two connected parts: a first edge sub-part 11212 and a second edge sub-part 11213. The first edge sub-part 11212 is connected to the second support body 11223, and the second edge sub-part 11213 is connected to the first flange structure 11226. The first edge sub-part 11212 is in contact with and connected to the second connecting surface, thereby forming a certain connection area between the first edge sub-part 11212 and the second connecting surface. The second edge sub-part 11213 is in contact with the flange surface, thereby forming a certain connection area between the second edge sub-part 11213 and the flange surface. The first edge sub-part 11212 and the second edge sub-part 11213 can be an integrally formed plate structure.

[0187] At least one of the following methods, namely the first edge sub-part 11212 and the second support body 11223, and the second edge sub-part 11213 and the first flange structure 11226, can be connected by one or more combinations of the above-mentioned injection molding, melting, welding, and bonding methods. It should be noted that the second edge sub-part 11213 must avoid the flange hole 11227 opened on the first flange structure 11226 so that the second edge sub-part 11213 can avoid the locking structure 1132.

[0188] In this embodiment, the edge portion 11211 can be connected to the first flange structure 11226 while being connected to the second support body 11223, thereby increasing the connection area between the edge portion 11211 and the frame 1122. This helps to improve the connection strength between the cover 1120 and the frame 1122, enhance the strength and resistance to damage of the cover 1120, and help reduce the creep of the flange surface.

[0189] In some embodiments, refer to Figure 19As shown, the first flange structure 11226 extends around a preset axis 1133, and a plurality of flange holes 11227 are provided on the first flange structure 11226, which are arranged around the preset axis 1133 and spaced apart. The second edge sub-part 11213 includes a plurality of edge bodies 11214, which are all connected to the first edge sub-part 11212. Each edge body 11214 is connected to the first flange structure 11226. The plurality of edge bodies 11214 are arranged around the preset axis 1133 and spaced apart, and the edge bodies 11214 avoid the flange holes 11227.

[0190] Specifically, the second edge sub-part 11213 adopts a discontinuous structural form. The second edge sub-part 11213 includes a plurality of edge bodies 11214 arranged at intervals. Each edge body 11214 is connected to the first edge sub-part 11212. The first edge sub-part 11212 and each edge body 11214 can be integrally molded. Each edge body 11214 is arranged at intervals around a preset axis 1133. Each edge body 11214 is connected to the first flange structure 11226. For example, if each edge body 11214 is plate-shaped or sheet-shaped, then each edge body 11214 is arranged to fit against the flange surface of the first flange structure 11226.

[0191] The outer contour of the first flange structure 11226 in a plane perpendicular to the preset axis 1133 can be circular, elliptical, or polygonal. Multiple flange holes 11227 are arranged around the preset axis 1133 and spaced apart on the first flange structure 11226. Since the locking structure 1132 is inserted into the flange hole 11227, each edge body 11214 should avoid the flange hole 11227 so that the locking structure 1132 does not interfere with the edge body 11214.

[0192] In this embodiment, the second edge sub-part 11213 adopts a structure in which multiple edge bodies 11214 are arranged at intervals, so that the second edge sub-part 11213 can avoid the flange hole 11227 on the first flange structure 11226, and it is beneficial to reduce the weight of the second edge sub-part 11213, so as to achieve the lightweighting of the box cover 1120.

[0193] In some embodiments, refer to Figure 19 As shown, each edge body 11214 is flush with the flange face.

[0194] When the edge body 11214 is fitted to the first flange structure 11226, the edge body 11214 can be directly fitted to the flange surface, so that the edge body 11214 protrudes from the flange surface.

[0195] In this example, each edge body 11214 is flush with the flange face, so that the flange face and the surface of the edge body 11214 form a plane. For example, corresponding to the position of each edge body 11214, a groove structure is opened on the flange face so that the edge body 11214 is inserted into and accommodated in the groove structure, so that the surface of the edge body 11214 is flush with the flange face.

[0196] In this embodiment, each edge body 11214 is flush with the flange face, which helps to improve the overall appearance consistency of the flange face.

[0197] In some embodiments, refer to Figure 4 and Figure 5 As shown, the edge portion 11211 includes a first plug-in structure 11215, and the frame 1122 forms an edge portion 11224 near the edge. The edge portion 11224 includes a second plug-in structure 11225, and the first plug-in structure 11215 and the second plug-in structure 11225 are plugged into each other.

[0198] Specifically, the position near the edge of the frame 1122 refers to the position near the edge portion 11211 of the frame 1122. The edge portion 11224 is a part of the frame 1122. For example, the edge portion 11224 is the edge portion near the edge portion 11211 of the first support 11222. Since the edge portion 11211 is ring-shaped, the edge portion 11224 of the frame 1122 is also ring-shaped. The edge portion 11224 is arranged around the preset axis 1133. When the cover 1121 is connected to the frame 1122, it is achieved by connecting the edge portion 11211 and the edge portion 11224.

[0199] The first plug-in structure 11215 can be a protruding structure, and correspondingly, the second plug-in structure 11225 is a groove structure, with the protruding structure and the groove structure plugging and mating together.

[0200] Optionally, the first plug-in structure 11215 can also be a groove structure, and correspondingly, the second plug-in structure 11225 is a protrusion structure, which is plugged into and cooperates with the groove structure.

[0201] Furthermore, multiple groove structures and protrusion structures can be matched to form multiple insertion parts between the first insertion structure 11215 and the second insertion structure 11225, thereby increasing the contact area between the edge portion 11211 and the frame 1122.

[0202] The first plug-in structure 11215 and the second plug-in structure 11225 can be connected by one or more of the above-mentioned methods such as injection molding, melting, welding, and bonding.

[0203] In this embodiment, by using the first plug-in structure 11215 and the second plug-in structure 11225 to plug into each other, the plug-in fit between the edge portion 11211 and the frame 1122 is realized, which helps to increase the contact area between the edge portion 11211 and the frame 1122, thereby helping to increase the connection strength between the cover 1121 and the frame 1122.

[0204] In some embodiments, the frame 1122 is a frame made of non-metallic material.

[0205] The lightweight non-metallic frame helps reduce the overall weight of the battery device. The frame 1122 is manufactured using injection molding. During the cooling process after molding, the first flange structure 11226 is prone to shrinkage, causing unevenness on the flange surface and affecting assembly with the housing 1110. Therefore, in this example, water-assisted or air-assisted injection molding is used to create the cavity 11228, thereby improving the molding effect of the flange surface of the first flange structure 11226.

[0206] In this embodiment, the frame 1122 and the cover 1121 are fitted together, and by forming a cavity 11228 inside the first flange structure 11226 during manufacturing, the deformation of the frame 1122 is reduced, and the forming effect and flatness of the flange surface of the first flange structure 11226 are improved.

[0207] In some specific embodiments, refer to Figure 1-24As shown, the battery device 1100 includes a battery cell assembly 1140 and a housing 1110. The housing 1110 includes a housing body 1130 and a housing cover 1120. The housing cover 1120 is connected to the housing body 1130 and together forms an accommodating space 1131. The battery cell assembly 1140 is housed within the accommodating space 1131. The housing cover 1120 includes a first flange structure 11226, and the interior of the first flange structure 11226 forms a cavity 11228. The first flange structure 11226 is arranged around a predetermined axis 1133. The cavity 11228 is arranged around the predetermined axis 1133. The first flange structure 11226 has multiple flange holes 11227, which surround the predetermined axis 1133. The first flange structure 11226 has at least one cavity 11228 on the side of the flange hole 11227 near the preset axis 1133, provided by the axis 1133; and / or, the first flange structure 11226 has at least one cavity 11228 on the side of the flange hole 11227 away from the preset axis 1133; and / or, at least one cavity 11228 is provided between any two adjacent flange holes 11227; the first flange structure 11226 extends around the preset axis 1133; the cavity 11228 includes a plurality of sub-cavities 11229, which are spaced apart around the preset axis 1133; the cavity 11228 is filled with fluid; and the cover 1120... A connecting channel 1123 is formed inside the cavity 11228, which passes through the surface between the cavity 11228 and the first flange structure 11226. The cover 1120 includes a cover body 1121 and a frame body 1122. The cover body 1121 has an edge portion 11211, and the frame body 1122 is arranged around the cover body 1121 and connected to the edge portion 11211. The first flange structure 11226 is formed on the frame body 1122. The frame body 1122 includes a frame body 11221 and the first flange structure 11226. The first flange structure 11226 is arranged around the frame body 11221 and connected to the frame body 11221. The box body 1110 also includes a locking structure 1132, which is connected to the first flange structure. Between 11226 and the box body 1130; the first flange structure 11226 extends around the preset axis 1133; the frame body 11221 includes a first support 11222 and a second support 11223, the second support 11223 extends around the preset axis 1133 and is connected to the first flange structure 11226, and protrudes from the first flange structure 11226 in a direction parallel to the preset axis 1133; the first support 11222 is connected to the protruding end of the second support 11223, and the first support 11222 extends toward the preset axis 1133, and the first support 11222 is attached to and connected to the edge portion 11211;The first flange structure 11226 has a flange face, and the edge portion 11211 includes a first edge sub-part 11212 and a second edge sub-part 11213 connected to the first edge sub-part 11212. The first edge sub-part 11212 is attached to and connected to the frame body 11221; the second edge sub-part 11213 is attached to and connected to the flange face; the frame body 1122 is a frame body made of non-metallic material.

[0208] According to some embodiments of this application, this application also provides an energy storage device, which includes a power conversion device and the energy storage device in the above embodiments. The power conversion device is used to electrically connect the power generation device and the energy storage device.

[0209] 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.

[0210] 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.

[0211] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0212] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] As an example, a power distribution module can be used to distribute power to modules in an energy storage device that require electricity.

[0219] According to some embodiments of this application, this application also provides an energy storage system, which includes a power conversion device and an energy storage device as described in the above embodiments. The power conversion device is used to electrically connect the power generation device and the energy storage device.

[0220] In some embodiments, the energy storage system may include one or more energy storage devices and a power conversion system (PCS), wherein the power conversion system is used to connect the power generation device and the energy storage device. The power generation device generates electrical energy, which can be stored in the energy storage device through the power conversion system. As examples, the power generation device may specifically be a solar panel, hydroelectric power generation device, thermal power generation device, wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0221] 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 energy storage device in the above embodiments, or the energy storage system in the above embodiments. The battery device 1100 is used to store or provide electrical energy.

[0222] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0223] 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.

[0224] 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.

[0225] 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 unit 1100 in the energy storage devices via cables. The battery unit 1100 can provide 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) to replenish their power.

[0226] Energy storage devices can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0227] 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 module (1140); The enclosure (1110) includes a main body (1130) and a cover (1120). The cover (1120) is connected to the main body (1130) and together they enclose a receiving space (1131). The battery cell assembly (1140) is housed in the receiving space (1131). The cover (1120) includes a first flange structure (11226), and a cavity (11228) is formed inside the first flange structure (11226).

2. The battery device (1100) as claimed in claim 1, characterized in that, The first flange structure (11226) is arranged around a preset axis (1133); the cavity (11228) is arranged around the preset axis.

3. The battery device (1100) as claimed in claim 2, characterized in that, The cavity (11228) is provided in multiple ways, and the extension axes of the multiple cavities (11228) are all located in the same plane perpendicular to the preset axis (1133).

4. The battery device (1100) as claimed in claim 3, characterized in that, The first flange structure (11226) has a plurality of flange holes (11227), which are spaced apart around the preset axis (1133). The first flange structure (11226) has at least one cavity (11228) on the side of the flange hole (11227) close to the preset axis (1133); and / or, the first flange structure (11226) has at least one cavity (11228) on the side of the flange hole (11227) away from the preset axis (1133); and / or, at least one cavity (11228) is formed between any two adjacent flange holes (11227).

5. The battery device (1100) as claimed in claim 2, characterized in that, The first flange structure (11226) has a plurality of flange holes (11227), which are spaced apart around the preset axis (1133). Along the extension direction of the cavity (11228), the cavity (11228) bends and extends between two adjacent flange holes (11227) and is alternately located on both sides of the flange hole (11227).

6. The battery device (1100) as claimed in claim 1, characterized in that, The first flange structure (11226) extends around a preset axis (1133); the cavity (11228) includes a plurality of sub-cavities (11229), and the plurality of sub-cavities (11229) are arranged at intervals around the preset axis (1133).

7. The battery device (1100) according to any one of claims 1-6, characterized in that, The cavity (11228) is filled with fluid.

8. The battery device (1100) according to any one of claims 2-6, characterized in that, The cavity (11228) has a preset height (H1) along the preset axis (1133), and the first flange structure (11226) has a preset thickness (H2) along the preset axis (1133). The preset height (H1) is 1%-95% of the preset thickness (H2).

9. The battery device (1100) according to any one of claims 2-6, characterized in that, The cavity (11228) has a first width (L1) in a direction perpendicular to the preset axis (1133), and the first flange structure (11226) has a second width (L2) in a direction perpendicular to the preset axis (1133). The first width (L1) is 1%-95% of the second width (L2).

10. The battery device (1100) according to any one of claims 1-6, characterized in that, A connecting channel (1123) is formed inside the cover (1120), and the connecting channel (1123) passes through the surface between the cavity (11228) and the first flange structure (11226).

11. The battery device (1100) according to any one of claims 1-6, characterized in that, The lid (1120) includes a lid body (1121) and a frame body (1122). The lid body (1121) has an edge portion (11211). The frame body (1122) is arranged around the lid body (1121) and connected to the edge portion (11211). The first flange structure (11226) is formed on the frame body (1122).

12. The battery device (1100) as claimed in claim 11, characterized in that, The frame (1122) includes a frame body (11221) and a first flange structure (11226), the first flange structure (11226) is arranged around the frame body (11221) and connected to the frame body (11221); the box (1110) also includes a locking structure (1132), the locking structure (1132) is connected between the first flange structure (11226) and the box body (1130).

13. The battery device (1100) as claimed in claim 12, characterized in that, The first flange structure (11226) extends around a preset axis (1133); the frame body (11221) includes a first support (11222) and a second support (11223), the second support (11223) extends around the preset axis (1133) and is connected to the first flange structure (11226), and protrudes from the first flange structure (11226) in a direction parallel to the preset axis (1133); the first support (11222) is connected to the protruding end of the second support (11223), and the first support (11222) extends toward the preset axis (1133), and the first support (11222) is attached to and connected to the edge portion (11211).

14. The battery device (1100) as claimed in claim 13, characterized in that, The edge portion (11211) is connected to the first support (11222) and the second support (11223).

15. The battery device (1100) as claimed in claim 12, characterized in that, The first flange structure (11226) has a flange face, and the edge portion (11211) includes a first edge sub-part (11212) and a second edge sub-part (11213) connected to the first edge sub-part (11212). The first edge sub-part (11212) is attached to and connected to the frame body (11221); the second edge sub-part (11213) is attached to and connected to the flange face.

16. The battery device (1100) as claimed in claim 14, characterized in that, The first flange structure (11226) has a flange face, and the edge portion (11211) includes a first edge sub-part (11212) and a second edge sub-part (11213) connected to the first edge sub-part (11212). The first edge sub-part (11212) is attached to and connected to the first support body (11222) and the second support body (11223). The second edge sub-part (11213) extends to the flange face and is attached to and connected to the flange face.

17. The battery device (1100) as claimed in claim 12, characterized in that, The first flange structure (11226) extends around a preset axis (1133); the frame body (11221) includes a second support (11223), which extends around the preset axis (1133) and is connected to the first flange structure (11226). Along a direction parallel to the preset axis (1133), the second support (11223) protrudes from the first flange structure (11226), and the edge portion (11211) is attached to and connected to the second support (11223).

18. The battery device (1100) as claimed in claim 17, characterized in that, The first flange structure (11226) has a flange face, and the edge portion (11211) includes a first edge sub-part (11212) and a second edge sub-part (11213) connected to the first edge sub-part (11212). The first edge sub-part (11212) is attached to and connected to the second support body (11223), and the second edge sub-part (11213) is attached to and connected to the flange face.

19. The battery device (1100) as claimed in claim 11, characterized in that, The frame (1122) is made of non-metallic material.

20. An energy storage device, characterized in that, It includes a plurality of battery devices (1100) as described in any one of claims 1-19, the battery devices (1100) being used to store or provide electrical energy.

21. An energy storage system comprising a power conversion device and an energy storage device as claimed in claim 20, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

22. An electrical device comprising a battery device (1100) as claimed in any one of claims 1-19, an energy storage device as claimed in claim 20, or an energy storage system as claimed in claim 21, wherein the battery device (1100) is used to store or provide electrical energy.

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