Battery device, electric equipment and energy storage device

Abstract

The utility model provides a battery device, electric equipment and an energy storage device, and belongs to the field of batteries. The battery device comprises two box bodies and a sealing piece, wherein the two box bodies cover each other and define a mounting space; each box body comprises a first wall, a peripheral side wall and a connecting edge, the peripheral side wall is connected with the peripheral edge of the first wall, the connecting edge is arranged around the periphery of the peripheral side wall, and the connecting edge is connected with the end, back on to the first wall, of the peripheral side wall in a turning mode and extends in the direction away from the mounting space; a protrusion protruding in the direction away from the first wall of the protrusion is formed on the circumferential edge of the connecting edge of at least one box body. The connecting edges of the two box bodies are oppositely connected, and a containing groove is formed between the two box bodies. The sealing piece is arranged in the containing groove. The shape and the groove depth of the containing groove are fixed, and the influence of factors such as manufacturing tolerance accumulation, machining errors and uneven stress in the assembling process is small, so that the thickness uniformity of the sealing piece limited in the containing groove is improved, and the sealing reliability is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, electrical equipment, and energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] Battery packs must be sealed and waterproof to prevent moisture, dust, and other external contaminants from entering the pack and causing corrosion or short circuits in individual battery cells and electrical components. Currently, battery boxes are sealed with sealant, and the reliability of this sealant directly determines the safety and stability of the battery system. Therefore, improving the sealing reliability of the battery box is an urgent problem to be solved. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery device, electrical appliance, and energy storage device that can improve the sealing reliability of the battery box.

[0005] An embodiment of the first aspect of this application provides a battery device, comprising: two housings and a sealing element, the two housings covering each other and enclosing an installation space; each housing includes a first wall, a peripheral side wall, and a connecting edge, the peripheral side wall being connected to the circumferential edge of the first wall, the connecting edge being disposed around the outer periphery of the peripheral side wall, the connecting edge being bent and connected to the end of the peripheral side wall facing away from the first wall and extending in a direction away from the installation space; at least one of the two housings has a protrusion formed at the outer peripheral edge of the connecting edge thereon, protruding in a direction away from the first wall thereon; the connecting edges of the two housings are connected to each other and a receiving groove is formed between them; each housing also includes four brackets corresponding one-to-one with the four corners of the peripheral side wall, the brackets being connected to the peripheral side wall and extending at least partially into the installation space, each bracket of one housing being opposite to one bracket of the other housing and an installation gap being formed between them; the sealing element is used to seal the gap between the two housings; the sealing element includes a sealant and four first sealing gaskets; each installation gap is provided with a first sealing gasket, the sealant is disposed in the receiving groove, or the sealant and the four first sealing gaskets are all disposed in the receiving groove.

[0006] In the technical solution of this application embodiment, the depth and shape of the receiving groove determined by the protrusion are controlled and fixed. The sealing element is compressed and disposed in the receiving groove with a fixed shape and fixed depth, which can improve the thickness uniformity of the sealing element to a certain extent, thereby improving the sealing reliability of the battery box. Moreover, by making the sealing element include both sealant and a first sealing gasket, the characteristics of the sealant and the sealing gasket are complementary.

[0007] In some embodiments, at least one of the two housings has a plurality of protrusions spaced circumferentially along the connecting edge of the peripheral sidewall.

[0008] In some embodiments, the minimum distance between the inner edge of the protrusion and the inner edge of the connecting edge is 2δ to 3δ, where δ is the minimum preset adhesive thickness. Using this technical solution, the minimum effective adhesive width between the two housings is 2δ to 3δ, thus enabling the sealant to provide a more durable sealing effect.

[0009] In some embodiments, the dimension of the receiving groove along the first direction is δ~4δ; δ is the minimum preset adhesive thickness, and the first direction is the closing direction of the two housings. Using this technical solution, the dimension of the seal along the first direction will not be too small, thus providing sufficient sealing reliability and durability.

[0010] In some embodiments, the peripheral sidewall has a rectangular cross-section perpendicular to the first direction, which is the closing direction of the two housings; the receiving groove is filled with sealant at the four corners of the peripheral sidewall; four first sealing gaskets correspond one-to-one with the four corners, and the first sealing gaskets are disposed between the two housings with the sealant at the corresponding corners facing the installation space.

[0011] Using this technical solution, the battery device can be used in vibration conditions, and it still has good sealing reliability under vibration conditions.

[0012] In some embodiments, each housing has a groove formed between its support and its peripheral sidewall; each groove in one housing communicates with a groove in another housing to form a receiving space; each mounting gap is provided with a first sealing gasket, and both the receiving groove and the receiving space are filled with sealant. By also filling the receiving space with sealant, it is beneficial to improve the sealing reliability and bonding reliability between the two housings.

[0013] In some embodiments, the receiving groove is filled with sealant in the non-corner area of ​​the peripheral sidewall; or, the seal further includes a second sealing gasket, in which the receiving groove is provided with a second sealing gasket in the non-corner area of ​​the peripheral sidewall.

[0014] This technical solution can seal the gap between two boxes at non-corner locations, and eliminates the need for a combination of sealant and gasket at these locations, thus saving on sealing materials and simplifying the assembly process of the seals at non-corner locations.

[0015] In some embodiments, a fixing position is provided on the connecting edge; the battery device also includes a fixing member, which is disposed at the fixing position of the two housings, and the two housings are fixedly connected by the fixing member. This embodiment uses a fixing member to fix the two housings together, which helps to improve the connection reliability of the two housings.

[0016] In some embodiments, it is fixedly positioned on the protrusion.

[0017] In some embodiments, in each housing, the surface of the connecting edge facing away from the first wall thereon is connected to the inner surface of the peripheral sidewall thereon by an arc transition surface.

[0018] With this technical solution, after the sealant is extruded onto the connecting edge of one of the boxes and then the two boxes are closed, the sealant is squeezed and flows into the box. The arc transition surface can act as a guide to direct excess sealant into the box.

[0019] In some embodiments, the included angle α between the two surfaces connected by the arc transition surface satisfies: 15°≤α≤65°.

[0020] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0021] An embodiment of the third aspect of this application provides an energy storage device that includes the battery device described above, the battery device being capable of storing and providing electrical energy.

[0022] 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

[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0024] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0025] Figure 2This is an exploded view of the battery device according to some embodiments of this application;

[0026] Figure 3 This is an exploded structural diagram of the battery box according to some embodiments of this application;

[0027] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle;

[0028] Figure 5 This is a partial cross-sectional schematic diagram of the first and second housings according to some embodiments of this application;

[0029] Figure 6 This is a top view of the second housing according to some embodiments of this application;

[0030] Figure 7 for Figure 6 A magnified view of a portion of point B in the middle;

[0031] Figure 8 and Figure 9 This is a partial cross-sectional schematic diagram of the battery box according to some embodiments of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1000 vehicles;

[0034] Battery unit 100, controller 200, motor 300;

[0035] Battery cell module 10, battery cell 11;

[0036] Battery box 20, box body 21, first box body 21a, second box body 21b, first wall 211, peripheral side wall 212, connecting edge 213, first mating edge 2131, second mating edge 2132, mating surface 2133, protrusion 214, joint surface 2141, receiving groove 215, fixing position 216, groove 217, sealant 22, first sealing gasket 23, bracket 24, installation gap 241, connecting plate 242, support plate 243, arc transition surface 25, fastener 26, receiving space 27. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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).

[0043] 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.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "linking", 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 connection of two components or the interaction between two components.

[0045] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0046] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0047] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" may mean that other components not listed may also be included, or that only the listed components may be included. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0048] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0049] To achieve the required sealing and waterproofing, existing batteries typically use a sealant at the joint surface between the first and second housings to seal the gap between them. Taking sealant as an example, both the surface on the first housing that mates with the second housing and the surface on the second housing that mates with the first housing are flat. During assembly, sealant is first applied to the surface on the first housing that mates with the second housing, and then the second housing is fitted onto the first housing before the sealant cures.

[0050] Understandably, in this method, the thickness of the seal at various points depends on the gap between the surface of the first housing that mates with the second housing and the surface of the second housing that mates with the first housing. Factors such as flatness errors, accumulated manufacturing tolerances, and uneven pressure distribution between the first and second housings during assembly all affect the size of this gap, making it difficult to control its consistency. For example, some areas may have too small a gap, while others may have too large a gap. Therefore, the thickness uniformity of the seal is poor, making it prone to cracking, delamination, or aging under conditions of vibration, high temperature, and water immersion, leading to battery seal failure. In other words, the battery box's sealing reliability is poor.

[0051] Based on the above considerations, a battery device was designed to address the problem. The device includes two housings that overlap to form an installation space. A protrusion is formed at the circumferential edge of the connecting edge of at least one housing, allowing the connecting edges of the two housings to connect and form a receiving groove between them. A sealing element is disposed within this receiving groove. In this battery device, the groove structure (i.e., the receiving groove) formed between the connecting edges of the two housings accommodates the sealing element. The fixed depth of the receiving groove results in greater consistency in the thickness of the sealing element, thus improving sealing reliability.

[0052] By including both a sealant and a first gasket in the sealant, the properties of the sealant and the gasket are made complementary.

[0053] The battery devices described in this application can be used, but are not limited to, in electrical equipment or energy storage devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices described in this application can be used to construct such electrical equipment or energy storage devices.

[0054] The energy storage device utilizing a battery as a power system in this application embodiment can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output it at appropriate times. For example, the 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 device provided in this application embodiment can be used in any power system that requires energy storage.

[0055] In some embodiments, the energy storage device is an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0056] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet. Each battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, these clusters are connected in parallel to increase the capacity of the energy storage device.

[0057] In this application, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. For the sake of brevity, the following embodiments all use electric vehicles as examples.

[0058] 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 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0059] In some embodiments of this application, the battery device 100 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.

[0060] Figure 2 A schematic diagram of the structure of a battery device 100 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0061] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0062] The battery cell 11 can be a rechargeable battery, meaning it can be used again after being discharged by recharging to activate the active materials. The battery cell 11 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not limit this. As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell 11 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc., and this application does not have any particular limitations.

[0063] like Figure 2 As shown, the battery device 100 in this embodiment can be a battery pack, which includes a battery case 20 and one or more battery cell assemblies 10, with the battery cell assemblies 10 housed within the battery case 20. The battery case 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The battery case 20 can be made of alloy materials such as aluminum alloy or iron alloy, polymer materials such as polycarbonate or polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin.

[0064] As an example, the battery cell assembly 10 can be a battery module, which can be housed in the battery box 20 by fixing the battery module into the battery box 20. The battery module can be formed by arranging and fixing multiple battery cells 11 together to form an independent module, or by bundling multiple battery cells 11 together with cable ties. As an example, the battery cell assembly 10 can also be housed in the battery box 20 by directly fixing multiple battery cells 11 into the battery box 20.

[0065] Figure 3 This is an exploded view of the battery box according to some embodiments of this application. Figure 4 for Figure 3 A magnified view of a portion of point A in the diagram. Figure 5 This is a partial cross-sectional schematic diagram of the first housing 21a and the second housing 21b according to some embodiments of this application. Figures 3 to 5 As shown, the battery box 20 includes two boxes 21, namely a first box 21a and a second box 21b. The two boxes 21 (i.e., the first box 21a and the second box 21b) cover each other and enclose an installation space to accommodate individual battery cells. Each box 21 includes a first wall 211, a peripheral side wall 212, and a connecting edge 213. The peripheral side wall 212 is connected to the circumferential edge of the first wall 211, and the connecting edge 213 is arranged around the outer periphery of the peripheral side wall 212. The connecting edge 213 is connected to the end of the peripheral side wall 212 facing away from the first wall 211 and extends in a direction away from the installation space. At least one of the boxes 21 has a protrusion 214 formed at the outer peripheral edge of the connecting edge 213, protruding in a direction away from the first wall 211. The connecting edges 213 of the two boxes 21 are connected to each other, and a receiving groove 215 is formed between them.

[0066] Figure 6 This is a top view of the second housing 21b according to some embodiments of this application. Figure 7 for Figure 6 A magnified view of a portion of point B in the diagram. Figure 8 and Figure 9 This is a partial cross-sectional schematic diagram of the battery box 20 according to some embodiments of this application. Please refer to... Figure 4 , Figure 5 and Figure 9 Each housing 21 may also include four brackets 24 corresponding to the four corners. The brackets 24 are connected to the peripheral sidewalls 212 and extend at least partially into the installation space. Each bracket 24 of one housing 21 is opposite to a bracket 24 of another housing 21 and an installation gap 241 is formed between them.

[0067] The battery assembly 100 also includes a seal for sealing the gap between the two housings 21. (Please combine...) Figure 5 , Figure 8 and Figure 9 The sealing element may specifically include sealant 22 and four first sealing gaskets 23. Each mounting gap 241 is provided with a first sealing gasket 23, and the sealant 22 is disposed in the receiving groove 215, or the sealant 22 and the four first sealing gaskets 23 are all disposed in the receiving groove 215.

[0068] In some embodiments, the battery box 20 may be part of the vehicle's chassis structure. For example, a portion of the battery box 20 may be at least a part of the vehicle's floor, or a portion of the battery box 20 may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0069] The housing 21 can be a one-piece molded part, which refers to a part that is formed by combining multiple components into a complete part through a one-time molding process during manufacturing. One-piece molded parts can be made by injection molding, die casting, forging, extrusion, etc. The first housing 21a and the second housing 21b are closed together in the vertical direction. The first housing 21a can be located above the second housing 21b, or the second housing 21b can be located above the first housing 21a.

[0070] like Figure 3 As shown, the battery box 20 can be in the shape of a cuboid. Correspondingly, the cross-section of the first wall 211 and the peripheral side wall 212 along the closing direction perpendicular to the two boxes 21 is rectangular. The connecting edge 213 is connected to the four edges of the peripheral side wall 212, that is, the connecting edge 213 is rectangular.

[0071] In some embodiments, such as Figure 4 and Figure 5 As shown, a protrusion 214 is formed at the outer peripheral edge of the connecting edge 213 of the second box 21b, protruding in a direction away from the first wall 211 of the second box 21b. No protrusion 214 is formed at the outer peripheral edge of the connecting edge 213 of the first box 21a. Therefore, the side of the connecting edge 213 of the first box 21a facing away from the first wall 211 of the first box 21a is flat. The non-protruding position on the connecting edge 213 of the second box 21b, together with the side of the connecting edge 213 of the first box 21a facing away from the first wall 211 of the first box 21a, defines the receiving groove 215. In some embodiments, a protrusion 214 is formed at the outer peripheral edge of the connecting edge 213 of the first box 21a, protruding in a direction away from the first wall 211 of the first box 21a, and the side of the connecting edge 213 of the second box 21b facing away from the first wall 211 of the second box 21b is flat.

[0072] In some embodiments, a protrusion 214 is formed at the outer peripheral edge of the connecting edge 213 of the two boxes 21, and the protrusion 214 on each box 21 extends protruding towards the other box 21. In this embodiment, the protrusion 214 of the first box 21a and the protrusion 214 of the second box 21b are connected to each other, and the non-protruding positions on the first box 21a and the second box 21b together form a receiving groove 215.

[0073] As an example, the protrusion 214 formed at the outer peripheral edge of the connecting edge 213 can be understood as the entire outer peripheral edge of the connecting edge 213 protruding to form a protrusion 214, thus the protrusion 214 is annular. In this example, the connecting edges 213 of the two boxes 21 are connected relative to each other and together define a receiving groove 215, which is annular. As an example, the protrusion 214 formed at the outer peripheral edge of the connecting edge 213 can also be understood as a part of the outer peripheral edge of the connecting edge 213 protruding to form a protrusion 214. The connecting edge 213 may have one protrusion 214 or multiple protrusions 214 spaced circumferentially along the peripheral sidewall 212. In this example, the connecting edges 213 of the two boxes 21 are connected relative to each other and together define a receiving groove 215, which has an opening at the outer peripheral edge of the connecting edge 213 facing outwards from the installation space.

[0074] The protrusion 214 being formed at the outer peripheral edge of the connecting edge 213 means that there is a gap between the protrusion 214 and the inner edge of the connecting edge 213, and at least a portion of the receiving groove 215 is located on the side of the protrusion 214 facing the mounting space. The protrusion 214 can be formed in various ways. As an example, the connecting edge 213 may include a flat plate and the protrusion 214, with the protrusion 214 disposed on the surface of the flat plate and located at the outer peripheral edge of the flat plate. As an example, a portion of the connecting edge 213 may also arch away from the first wall 211 to form the protrusion 214.

[0075] exist Figure 6 In the middle, the part enclosed by the dashed box at the corner can be referred to. It can be understood that the cross-section of the peripheral sidewall 212 along the direction perpendicular to the first direction can be a right-angled rectangle, and the corner can be a right angle. Or, in Figure 6 In the middle, the cross section of the peripheral sidewall 212 perpendicular to the first direction can be a rounded rectangle, and the corners include connected arc segments and straight segments.

[0076] Each bracket 24 is positioned at a corresponding corner. The bracket 24 can be connected to the straight section of the peripheral sidewall 212 corresponding to the corner, or it can be connected to the curved section of the peripheral sidewall 212 corresponding to the corner.

[0077] The term "at least part" for the support 24 can refer to a portion of the support 24 or to the entire support 24. As an example, the support 24 may be a flat plate structure, with one end connected to the peripheral sidewall 212. For example, as... Figure 8 and Figure 9 As shown, the bracket 24 includes a connecting plate 242 and a support plate 243. The connecting plate 242 is connected to the peripheral wall 212, and the support plate 243 is connected to the connecting plate 242 by a bend, with the support plate 243 extending towards the inner side of the peripheral wall 212 relative to the connecting plate 242. When the two boxes 21 are closed, an installation gap 241 is formed between the support plate 243 of one box 21 and the support plate 243 of the other box 21. The connection between the bracket 24 and the peripheral wall 212 can be achieved using one or more of the following techniques: welding, screwing, bonding, and snap-fitting.

[0078] The sealant can be one or more of polyurethane adhesive, epoxy resin adhesive, modified silane polyether adhesive, etc. The material of the first sealing gasket 23 can be one or more of rubber (e.g., nitrile rubber, fluororubber, silicone rubber) and plastic (e.g., polyurethane, thermoplastic elastomer).

[0079] As an example, please combine Figure 8 The sealant 22 and four first sealing gaskets 23 are all disposed within the receiving groove 215. In this embodiment, the thickness of the first sealing gasket 23 in its natural state is greater than the dimension of the receiving groove 215 along the closing direction of the two boxes 21. The natural state of the first sealing gasket 23 refers to the state when the first sealing gasket 23 is not compressed.

[0080] An exemplary assembly process of the battery device 100 in this embodiment is roughly as follows: a) providing a first housing 21a and a second housing 21b, wherein the side of the connecting edge 213 of the first housing 21a facing away from the first wall 211 of the first housing 21a is a plane, and a protrusion 214 protruding in a direction away from the first wall 211 of the second housing 21b is formed at the outer peripheral edge of the connecting edge 213 of the second housing 21b; b) providing a first sealing gasket 23, wherein the first sealing gasket 23 is in its natural state and its thickness is equal to the initial thickness, and the first sealing gasket 23 is connected to the first wall 211 of the second housing 21b; a) Adhesive is applied to the connecting edge of the second housing 21b; c) A paste sealant is squeezed onto the surface of the connecting edge 213 of the second housing 21b, with the protrusion 214 facing inward towards the inside of the second housing 21b; d) The first housing 21a is placed over the second housing 21b. During the process of the first housing 21a and the second housing 21b being closed, the first sealing gasket 23 is squeezed by the connecting edge 213 of the two housings 21, and its thickness gradually decreases. The paste sealant 22 will flow to the surroundings under pressure until the first housing 21a and the second housing 21b are closed together.

[0081] As an example, please combine Figure 9 Each installation gap 241 is provided with a first sealing gasket 23, and sealant 22 is disposed in the receiving groove 215. In this embodiment, the thickness of the first sealing gasket 23 in its natural state is greater than the dimension of the installation gap 241 along the closing direction of the two housings 21. In this embodiment, during the assembly of the battery device 100, step b) above can be replaced by providing the first sealing gasket 23. At this time, the first sealing gasket 23 is in its natural state, and the first sealing gasket 23 is bonded to the bracket 24 with adhesive. During the closing process of the first housing 21a and the second housing 21b in step d) above, the first sealing gasket 23 is squeezed by the two brackets 24.

[0082] In this embodiment, the battery device 100 has a protrusion 214 formed on the outer peripheral edge of the connecting edge 213 of at least one housing 21, protruding in a direction away from its own first wall 211. This allows the connecting edges 213 of the two housings 21 to be connected relative to each other, forming a receiving groove 215 between them to accommodate a seal. It is understood that the depth and shape of the receiving groove 215, determined by the protrusion 214, are controlled and fixed. This allows the seal to be compressed and disposed within the receiving groove 215 of a fixed shape and fixed depth, rather than entirely depending on the gap between the two housings 21. Therefore, the fluctuations in the thickness of the seal caused by factors such as flatness error, accumulated manufacturing tolerances, and uneven pressure distribution between the two housings 21 during assembly are reduced. Consequently, the thickness uniformity of the seal can be improved to a certain extent, thereby improving the sealing reliability of the battery device 100.

[0083] It should also be noted that, regardless of whether manual or machine methods are used, when placing the seal on the housing 21, the protrusion 214 can serve as a visual positioning reference, so as to quickly and accurately locate the initial position of the seal during assembly.

[0084] Furthermore, by including the sealant 22 and four first sealing gaskets 23 in the sealant, this embodiment achieves complementary properties between the sealant 22 and the sealing gaskets, enabling the sealant to withstand stress and maintain a seal. Please refer to... Figure 9 In the embodiment where a first sealing gasket 23 is provided in each installation gap 241 and the sealant 22 is provided in the receiving groove 215, the sealant is also provided in the installation space, which helps to increase the sealing area between the two housings 21 and helps to improve the sealing reliability.

[0085] According to some embodiments of this application, at least one of the two housings 21 has a plurality of protrusions 214 spaced circumferentially along the peripheral sidewall 212 on the connecting edge 213.

[0086] In this embodiment, part of the receiving groove 215 is located on the side of the protrusion 214 facing the installation space, and part is located between two adjacent protrusions 214 along the circumferential sidewall 212. Thus, a seal is also provided between two adjacent protrusions 214 along the circumferential sidewall 212. The shape of the protrusion 214 is not limited and can be circular, rectangular, square-round, elongated, elliptical, or other irregular shapes.

[0087] According to some embodiments of this application, the dimension D of the receiving groove 215 along the first direction can be designed to be δ~4δ, where δ is the minimum preset adhesive thickness and the first direction is the closing direction of the two boxes 21.

[0088] The first direction can be referenced to the closing direction Z of the two housings 21. The minimum preset adhesive thickness δ can be determined based on the average thickness of the sealant's adhesive performance verification test. For example, the sealant can be epoxy resin, and δ can be 0.1 mm to 0.5 mm. Another example is polyurethane sealant, where δ can be 0.5 mm to 2 mm, specifically any value among 0.5 mm, 1 mm, 1.5 mm, and 2 mm. Yet another example is modified silane polyether sealant, where δ can be 1 mm to 3 mm.

[0089] In some examples, a protrusion 214 is formed at the circumferential edge of the connecting edge 213 of only one housing 21. For example, if the side of the connecting edge 213 of the first housing 21a facing away from the first wall 211 of the first housing 21a is flat, and the connecting edge 213 of the second housing 21b has a protrusion 214, then the side of the connecting edge 213 of the second housing 21b facing away from the first wall 211 of the second housing 21b includes a mating surface 2133 and a joining surface 2141. The protrusion 214 protrudes relative to the mating surface 2133 in a direction away from the first wall 211 of the second housing 21b, and the surface of the protrusion 214 is the joining surface 2141. Figure 4 In this embodiment, the protrusion 214 is configured such that the mating surface 2141 is planar. It can be understood that when the connecting edge 213 is configured to include a flat plate and the protrusion 214, the surface of the flat plate facing away from the first wall 211 is the mating surface 2133, and the protrusion 214 protrudes from the mating surface 2133; when the connecting edge 213 is configured to partially arch away from the first wall 211 to form the protrusion 214, the surface of the non-arched portion of the connecting edge 213 facing away from the first wall 211 is the mating surface 2133. In this embodiment, the dimension D of the receiving groove 215 along the first direction is equal to the normal distance between the mating surface 2133 and the mating surface 2141 along the first direction. Therefore, in this example, the normal distance between the mating surface 2133 and the mating surface 2141 along the first direction is δ~4δ.

[0090] In other examples, protrusions 214 are formed at the circumferential edges of the connecting edges 213 of the two boxes 21. The side of the first wall 211 facing away from itself on the connecting edges 213 of the first box 21a and the second box 21b both include the aforementioned mating surface 2133 and the aforementioned joining surface 2141. The mating surfaces 2133 of the first box 21a and the second box 21b are opposite to and connected, and the joining surfaces 2141 of the first box 21a and the second box 21b are opposite to and connected. Here, the joining surfaces 2141 of the two boxes 21 can be bonded together with adhesive or simply attached to each other. In this embodiment, the normal distance between the mating surfaces 2133 and the joining surfaces 2141 of the first box 21a along the first direction is the first distance, and the normal distance between the mating surfaces 2133 and the joining surfaces 2141 of the second box 21b along the first direction is the second distance. The sum of the first distance and the second distance is the dimension D of the receiving groove 215 along the first direction. The first distance and the second distance can be equal or unequal. For example, if the first distance and the second distance are both 0.5δ, then D equals δ; if the first distance and the second distance are both 2δ, then D equals 4δ.

[0091] Specifically, D can be a range consisting of δ, 1.5δ, 2δ, 2.5δ, 3δ, 3.5δ, 4δ, or any two of them.

[0092] In this embodiment, the battery device 100 forms a protrusion 214 on the circumferential edge of at least one housing 21's connecting edge 213, creating a receiving groove 215 between the connecting edges 213 of the two housings 21. The protrusion height of the protrusion 214 directly determines the dimension of the receiving groove 215 along the first direction (i.e., the groove depth of the receiving groove 215). This allows the dimension of the seal along the first direction to be controlled to be no less than the minimum design adhesive thickness δ and no more than 4δ, ensuring that the dimension of the seal along the first direction is not too small, thus providing sufficient sealing reliability and durability.

[0093] According to some embodiments of this application, such as Figure 4 As shown, the minimum distance W between the inner edge of the protrusion 214 and the inner edge of the connecting edge 213 can be designed to be 2δ~3δ, where δ is the minimum preset adhesive thickness.

[0094] As described above, the battery box 20 can be rectangular or cylindrical. Please refer to some embodiments of this application for further details. Figures 2 to 4The battery box 20 is rectangular, and its first wall 211 is rectangular. In this example, the receiving slot 215 may specifically include four sub-slots connected end to end along the circumference of the peripheral sidewall 212. The four sub-slots include two first sub-slots and two second sub-slots. The two first sub-slots are spaced apart along a second direction, and the two second sub-slots are spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The second direction can be referred to as the length direction X of the rectangular battery box 20, and the third direction can be referred to as the width direction Y of the rectangular battery box 20.

[0095] In this embodiment, the connecting edge 213 includes four mating edges that are sequentially connected end-to-end along the circumferential direction of the peripheral sidewall 212. The four mating edges include two first mating edges 2131 and two second mating edges 2132. The two first mating edges 2131 are spaced apart along a second direction, and the two second mating edges 2132 are spaced apart along a third direction. The first mating edge 2131 of one housing 21 is connected to the first mating edge 2131 of another housing 21, and the two together define a first sub-groove. Similarly, the second mating edges 2132 of one housing 21 are connected to the second mating edges 2132 of another housing 21, and the two together define a second sub-groove.

[0096] As described above, the protrusion 214 can be of a regular or irregular shape. Based on this, it is easy to understand that the dimension of the first sub-slot along the second direction can be equal or unequal everywhere, and the dimension of the second sub-slot along the third direction can be equal or unequal everywhere. The minimum value of the dimension of the first sub-slot along the second direction and the dimension of the second sub-slot along the third direction is W. Alternatively, in an embodiment where the battery box 20 is cylindrical, the minimum value of the radial dimension of the receiving groove 215 along the battery box 20 is W.

[0097] Wherein, W can be a range consisting of 2δ, 2.2δ, 2.4δ, 2.6δ, 2.8δ, 3δ, or any two of them.

[0098] In this embodiment, the minimum effective adhesive width (i.e., W) between the two housings 21 is 2δ~3δ, which enables the sealant to provide a more durable sealing effect, thus improving the sealing reliability of the battery housing 20.

[0099] According to some embodiments of this application, the battery box 20 is as follows: Figure 6 The structure shown is rectangular, with the sidewalls 212 having a rectangular cross-section perpendicular to a first direction, which is the closing direction Z of the two boxes 21. Furthermore, please refer to... Figure 5 , Figure 8 and Figure 9The areas at the four corners of the receiving groove 215 located on the peripheral sidewall 212 can be filled with sealant 22. Four first sealing gaskets 23 correspond one-to-one with the four corners. The first sealing gaskets 23 are placed on the side of the sealant 22 facing the installation space at the corresponding corners and compressed between the two housings 21.

[0100] Wherein, from one end connected to the first wall 211 to the end opposite to the first wall 211, the peripheral sidewall 212 can extend along the first direction, that is, the peripheral sidewall 212 is a prism structure. Alternatively, from one end connected to the first wall 211 to the end opposite to the first wall 211, the peripheral sidewall 212 gradually moves away from the circumferential edge of the first wall 211, that is, the peripheral sidewall 212 is a frustum pyramid structure.

[0101] The intersection area of ​​the first mating edge 2131 and each of the second mating edges 2132 is the corner. The first sealing gasket 23 can be arc-shaped and located in the arc segment, or it can be straight and located in the straight segment. The first sealing gasket 23 can be an integral structure or a split structure. For example, the first sealing gasket 23 is composed of multiple sub-sealing gaskets.

[0102] The entire circumference of the receiving groove 215 can be filled with sealant, or the areas at the four corners of the receiving groove 215 can be filled with sealant. A first sealing gasket 23 is provided at each corner. The first sealing gasket 23 is compressed between the two housings 21 when its compression rate is greater than 0%. The thickness of the first sealing gasket 23 in its natural state is the initial thickness. The difference between the initial thickness and the thickness of the first sealing gasket 23 when compressed between the two housings 21 is the first difference value. The compression rate is equal to the ratio of the first difference value to the initial thickness.

[0103] For example, when the battery device 100 of this embodiment is actually applied to a vehicle 1000, the frame of the vehicle 1000 is subjected to complex loads (e.g., torsional forces) and transmitted to the four corners of the battery box 20. In other words, the four corners of the cuboid battery box 20 of the battery device 100 on the vehicle 1000 bear significant stress. In this embodiment, the cuboid battery box 20 achieves double-layer sealing at the four corners using a combination of sealant 22 and sealing gaskets. The sealant 22 has a certain rigidity, so the sealant 22 at the four corners can withstand stress, which helps to reduce the possibility of the sealing at the corners failing due to excessive stress. Even if the sealant 22 at the four corners fails due to shear fatigue cracks caused by excessive stress, the first sealing gasket 23 can maintain the seal, making the sealing of the battery device 100 reliable. Thus, the battery device 100 of this embodiment can be used in vibration conditions, and the battery device 100 still has good sealing reliability under vibration conditions.

[0104] During assembly of the battery device 100 in this embodiment, when the first housing 21a and the second housing 21b are closed, the first sealing gasket 23 prevents the sealant 22 from overflowing into the installation space, thus restricting the flow of sealant 22 at the corners into the installation space and ensuring that the thickness of the sealant 22 at the inner periphery of the connecting edge 213 is not too small. Simultaneously, the protrusion 214 blocks the flow of the paste-like sealant 22, acting as a "barrier" and physically constraining the flow direction of the sealant 22. This restricts the flow of sealant 22 towards the outer periphery of the connecting edge 213, mitigating the problem of insufficient thickness of the sealant 22 at the outer periphery of the connecting edge 213. This improves the uniformity of the sealant 22 thickness to a certain extent, thus positively impacting sealing reliability.

[0105] According to some embodiments of this application, such as Figure 5 As shown, in each housing 21, a groove 217 is formed between the support 24 on it and its peripheral sidewall 212. (As...) Figure 8 and Figure 9 As shown, each groove 217 of the first housing 21a communicates with a groove 217 of the second housing 21b to form a receiving space 27. Each mounting gap 241 is provided with a first sealing gasket 23, and both the receiving groove 215 and the receiving space 27 are filled with sealant 22.

[0106] like Figure 5 and Figure 8 As shown, the connection between the peripheral sidewall 212 of the housing 21 and the connecting edge 213 is smoothly transitioned to form a first arc surface, and the connection between the support plate 243 of the bracket 24 and the connecting plate 242 is smoothly transitioned to form a second arc surface. The first arc surface and the second arc surface together define the groove 217.

[0107] During the assembly of the battery device 100, the first sealing gasket 23 is first placed on the bracket 24. A paste-like sealant is then extruded onto the surface of the connecting edge 213 of the second housing 21b, positioned between the first sealing gasket 23 and the protrusion 214. During the closing process of the first housing 21a and the second housing 21b, the paste-like sealant overflows and fills the receiving space 27. In some embodiments, the paste-like sealant overflows and fills part of the mounting gap 241.

[0108] By filling the containment space 27 with sealant 22, the sealing area between the two boxes 21 is further increased, which helps to improve the sealing reliability and bonding reliability between the two boxes 21.

[0109] According to some embodiments of this application, the area of ​​the receiving groove 215 corresponding to the non-corner area of ​​the peripheral sidewall 212 may be filled with sealant 22.

[0110] exist Figure 6 In the diagram, the portion of the peripheral sidewall 212 not within the dashed frame represents the non-corner portion of the peripheral sidewall 212. That is to say, combining... Figure 6 As shown, the portion of the receiving groove 215, except for the part within the dashed box, can also be filled with sealant 22. As an example, the receiving groove 215 is provided with sealant 22 along the entire circumference of the peripheral sidewall 212.

[0111] According to some embodiments of this application, the seal further includes a second sealing gasket (not shown in the figure), and the receiving groove 215 may be provided with the second sealing gasket in the non-corner area corresponding to the peripheral sidewall 212. That is to say, in combination with Figure 6 As shown, except for the portion within the dashed box, the remaining portion of the receiving groove 215 may be equipped with a second sealing gasket. The compression ratio of the second sealing gasket is also greater than 0%, meaning the second sealing gasket is compressed and disposed within the receiving groove 215. Furthermore, based on the embodiment where both the sealant 22 and the four first sealing gaskets 23 are disposed within the receiving groove 215, the first sealing gaskets 23 and the second sealing gaskets may be connected to each other to form an annular component, or the first sealing gaskets 23 and the second sealing gaskets may not be connected. The material of the second sealing gasket may be similar to that of the first sealing gasket 23, and the initial thickness of the second sealing gasket may be equal to the initial thickness of the first sealing gasket 23.

[0112] As described above, the frame of vehicle 1000 is subjected to complex loads, which are transmitted to the four corners of battery box 20. The non-corner areas of battery box 20 bear less stress. In this embodiment, by setting sealant 22 or a second sealing gasket in the area of ​​the receiving groove 215 corresponding to the non-corner area of ​​the peripheral sidewall 212, the gap between the two boxes 21 at the non-corner area can be sealed. Moreover, the non-corner area does not require the use of sealant 22 and sealing gasket combination, which helps to save sealing materials and simplify the assembly process of the sealing components at the non-corner area.

[0113] According to some embodiments of this application, a fixing position 216 is also provided on the connecting edge 213. The battery device 100 may also include a fixing member 26, which is disposed at the fixing position 216 of the two housings 21, and the two housings 21 are fixedly connected by the fixing member 26.

[0114] The fixing position 216 refers to the location and area on the connecting edge 213 used to provide installation for the fastener 26. Each fixing position 216 on the first housing 21a corresponds to each fixing position 216 on the second housing 21b, and the fastener 26 is fixed to one fixing position 216 on the first housing 21a and the corresponding fixing position 216 on the second housing 21b.

[0115] The fastener 26 can be implemented as any of a bolt, screw, or rivet. Taking the fastener 26 as a bolt as an example, the fixing position 216 can be a through hole that penetrates the thickness of the connecting edge 213.

[0116] In this embodiment, the two boxes 21 are fixedly connected by fasteners 26, which helps to improve the connection reliability of the two boxes 21.

[0117] According to some embodiments of this application, such as Figure 4 As shown, the fixing position 216 can be provided on the protrusion 214. In this embodiment, the fixing member 26 is fixedly provided on the protrusion 214. As an alternative embodiment, in an embodiment where multiple protrusions 214 are spaced apart circumferentially along the connecting edge 213 along the peripheral sidewall 212, the fixing position 216 can be located between two adjacent protrusions 214 along the circumferential direction of the peripheral sidewall 212.

[0118] Please refer to some embodiments of this application. Figure 4 , Figure 5 , Figure 8 and Figure 9 For each housing 21, the surface of the connecting edge 213 facing away from the first wall 211 is connected to the inner surface of the peripheral side wall 212 via an arc transition surface 25.

[0119] Specifically, for the box 21 with a protrusion 214 formed at the circumferential edge of the connecting edge 213, the mating surface 2133 of the connecting edge 213 is connected to the inner surface of the peripheral sidewall 212 through an arc transition surface 25. For the box 21 without a protrusion 214 formed at the circumferential edge of the connecting edge 213, the surface of the connecting edge 213 facing away from the first wall 211 is flat and is connected to the inner surface of the peripheral sidewall 212 through an arc transition surface 25. That is, the connection between the surface of the connecting edge 213 facing away from the first wall 211 and the inner surface of the peripheral sidewall 212 is rounded.

[0120] By setting the arc transition surface 25, when the sealant 22 is squeezed onto the connecting edge 213 of one of the boxes 21 and then the two boxes 21 are closed, the sealant 22 is squeezed and flows into the box 21. The arc transition surface 25 can play a guiding role to guide the excess sealant 22 at non-corner locations into the box 21.

[0121] According to some embodiments of this application, the included angle α between the two surfaces connected by the arc transition surface 25 can satisfy: 15°≤α≤65°. Specifically, α can be a range of 15°, 25°, 35°, 45°, 55°, 65°, or any combination thereof.

[0122] exist Figures 3 to 5In the middle, the peripheral sidewall 212 has a frustum pyramid structure. For the box 21 with a protrusion 214 formed on the connecting edge 213, the two surfaces connected by the arc transition surface 25 refer to the inner surface of the peripheral sidewall 212 and the mating surface 2133; for the box 21 without a protrusion 214 formed on the connecting edge 213, the two surfaces connected by the arc transition surface 25 refer to the inner surface of the peripheral sidewall 212 and the surface of the connecting edge 213 facing away from the first wall 211.

[0123] In this embodiment, the inner surface of the peripheral sidewall 212 is inclined relative to the first direction (the closing direction Z of the two boxes 21). Therefore, when the two boxes 21 are closed, the excess sealant 22 flows along the arc transition surface 25 to the inner surface of the peripheral sidewall 212, and flows to the first wall 211 of the lower box 21 under the guidance of the inner surface of the peripheral sidewall 212.

[0124] An embodiment of the second aspect of this application provides an electrical device including the battery device 100 described in the above embodiments, the battery device 100 being used to provide electrical energy. The electrical device includes vehicles (such as vehicles, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, power tools, etc. It is understood that the electrical device provided in this application, by employing any of the aforementioned battery devices 100, possesses all the beneficial effects of the aforementioned battery devices 100, which will not be elaborated further here.

[0125] An embodiment of the third aspect of this application provides an energy storage device, which includes the battery device 100 described in the above embodiments, the battery device 100 being used to store electrical energy. The energy storage device may include, but is not limited to, centralized energy storage devices (e.g., containerized energy storage devices), distributed energy storage devices, portable energy storage devices, wearable energy storage devices, etc. It is understood that the energy storage device provided in this application, by employing any of the aforementioned battery devices 100, possesses all the beneficial effects of the aforementioned battery devices 100, which will not be elaborated further here.

[0126] 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.

[0127] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0128] like Figures 3 to 5As shown, the battery device 100 includes a battery cell assembly and a cuboid battery box 20. The battery box 20 includes two boxes 21, namely a first box 21a and a second box 21b. The first box 21a covers the second box 21b and together encloses an installation space for installing the battery cell assembly. Each box 21 includes a first wall 211, a peripheral side wall 212, and a connecting edge 213. The peripheral side wall 212 is connected to the circumferential edge of the first wall 211. The connecting edge 213 is arranged around the outer periphery of the peripheral side wall 212. The connecting edge 213 is connected to the end of the peripheral side wall 212 facing away from the first wall 211 and extends in a direction away from the installation space. The connection between the peripheral side wall 212 and the connecting edge 213 of each box is smoothly transitioned and forms a first arc surface.

[0129] The surface of the connecting edge 213 of the first housing 21a facing away from the first wall 211 of the first housing 21a is flat. A portion of the connecting edge 213 of the second housing 21b arches towards the first housing 21a, forming a protrusion 214 located at the circumferential edge of the connecting edge 213. The surface of the non-arched portion of the connecting edge 213 facing away from the first wall 211 of the second housing 21b is the mating surface 2133, and the surface of the protrusion 214 facing away from the corresponding connecting edge 213 is the joining surface 2141, which is flat. The surface of the connecting edge 213 of the first housing 21a facing away from the first wall 211 of the first housing 21a is opposite to the mating surface 2133 and the joining surface 2141 of the second housing 21b, forming a receiving groove 215 between them. The dimension D of the receiving groove 215 along the closing direction of the two housings 21 is δ~4δ; δ is the minimum preset adhesive thickness, which is 1 mm. The areas at the four corners of the receiving groove 215 located on the peripheral sidewall 212 are filled with sealant 22. A first sealing gasket 23 is also provided on the inner side of the sealant 22 at each corner, and the first sealing gasket 23 is compressed and disposed between the two boxes 21.

[0130] like Figure 8 As shown, each housing 21 also includes four supports 24 corresponding to the four corners. Each support 24 includes a connecting plate 242 and a support plate 243. The connecting plate 242 is connected to the peripheral sidewall 212, and the support plate 243 is connected to the connecting plate 242 by a bend. The support plate 243 extends towards the inner side of the peripheral sidewall 212 relative to the connecting plate 242. The connection between the support plate 243 and the connecting plate 242 of the support 24 is smoothly transitioned and forms a second arc surface. The first arc surface and the second arc surface together define a groove 217. Each groove 217 of the first housing 21a communicates with a groove 217 of the second housing 21b to form a receiving space 27.

[0131] An installation gap 241 is formed between each bracket 24 of the first housing 21a and each bracket 24 of the second housing 21b. A first sealing gasket 23 is disposed in the installation gap 241, and both the receiving groove 215 and the receiving space 27 are filled with sealant 22. Alternatively, as Figure 9 As shown, the first sealing gasket 23 is disposed within the receiving groove 215. The area of ​​the receiving groove 215 corresponding to the non-corner area of ​​the peripheral sidewall 212 is filled with sealant 22 or provided with a second sealing gasket.

[0132] The minimum distance W between the inner edge of the protrusion 214 and the inner edge of the connecting edge 213 is 2δ~3δ.

[0133] The surface of the connecting edge 213 facing away from the first wall 211 is connected to the inner surface of the peripheral side wall 212 through an arc transition surface 25. The included angle α between the two surfaces connected by the arc transition surface 25 satisfies: 15°≤α≤65°.

[0134] Both the connecting edge 213 of the first housing 21a and the connecting edge 213 of the second housing 21b are provided with fixing positions 216, and the fixing position 216 of the second housing 21b is on the mating surface 2141. The connecting edge 213 of the first housing 21a and the connecting edge 213 of the second housing 21b are connected by a self-piercing riveting method, and the rivets are set at one fixing position 216 on the first housing 21a and one corresponding fixing position 216 on the second housing 21b.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Two enclosures are provided, which overlap each other to enclose an installation space. Each enclosure includes a first wall, a peripheral side wall, and a connecting edge. The peripheral side wall is connected to the circumferential edge of the first wall, and the connecting edge is arranged around the outer periphery of the peripheral side wall. The connecting edge is connected to the end of the peripheral side wall facing away from the first wall and extends in a direction away from the installation space. At least one of the enclosures has a protrusion at the outer peripheral edge of the connecting edge, which protrudes in a direction away from the first wall. The connecting edges of the two enclosures are connected to each other and a receiving groove is formed between them. Each enclosure also includes four brackets corresponding to the four corners of the peripheral side wall. The brackets are connected to the peripheral side wall and extend at least partially into the installation space. Each bracket of one enclosure is opposite to a bracket of the other enclosure, and an installation gap is formed between them. A sealing element is used to seal the gap between the two housings; the sealing element includes sealant and four first sealing gaskets; each of the installation gaps is provided with one first sealing gasket, and the sealant is disposed in the receiving groove, or the sealant and the four first sealing gaskets are all disposed in the receiving groove.

2. The battery device according to claim 1, characterized in that, At least one of the two housings has a plurality of protrusions spaced circumferentially along the connecting edge of the peripheral sidewall.

3. The battery device according to claim 1, characterized in that, The minimum distance between the inner edge of the protrusion and the inner edge of the connecting edge is 2δ~3δ, where δ is the minimum preset adhesive thickness.

4. The battery device according to claim 1, characterized in that, The dimension of the receiving groove along the first direction is δ~4δ; δ is the minimum preset glue thickness, and the first direction is the closing direction of the two boxes.

5. The battery device according to any one of claims 1 to 4, characterized in that, The peripheral sidewall has a rectangular cross-section perpendicular to the first direction, where the first direction is the closing direction of the two boxes; The area at the four corners of the receiving groove on the peripheral sidewall is filled with the sealant. The four first sealing gaskets correspond one-to-one with the four corners. The first sealing gaskets are placed on the side of the sealant facing the installation space at the corresponding corners and compressed between the two boxes.

6. The battery device according to claim 5, characterized in that, Each of the boxes has a groove formed between the support and its peripheral sidewall; each groove of one of the boxes communicates with a groove of the other box to form a receiving space; Each of the installation gaps is provided with a first sealing gasket, and the receiving groove and the receiving space are both filled with the sealant.

7. The battery device according to claim 5, characterized in that, The receiving groove is filled with the sealant in the area of ​​the non-corner section of the peripheral wall; or, the sealant further includes a second sealing gasket, and the receiving groove is provided with the second sealing gasket in the area of ​​the non-corner section of the peripheral wall.

8. The battery device according to any one of claims 1 to 3, characterized in that, The connecting edge is provided with a fixing position, and the battery device also includes a fixing member. The fixing member is disposed at the fixing position of the two boxes, and the two boxes are fixedly connected by the fixing member.

9. The battery device according to claim 8, characterized in that, The fixing position is located on the protrusion.

10. The battery device according to any one of claims 1 to 3, characterized in that, Each of the enclosures has its connecting edge facing away from the surface of the first wall thereon connected to the inner surface of the peripheral sidewall thereon via an arc transition surface.

11. The battery device according to claim 10, characterized in that, The included angle α between the two surfaces connected by the arc transition surface satisfies: 15°≤α≤65°.

12. An electrical appliance, characterized in that, The electrical equipment includes a battery device as described in any one of claims 1 to 11, the battery device being used to provide electrical energy.

13. An energy storage device, characterized in that, The energy storage device includes a battery device as described in any one of claims 1 to 11, the battery device being used to store electrical energy.

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