Battery case, battery, and electric device

Abstract

A battery case (100), a battery (200), and an electric device (1000). The battery case (100) comprises a first case portion (1), a second case portion (2), a first sealing member (3), and first fastening members (4); the first case portion (1) and the second case portion (2) are sealedly connected to form a sealed cavity (101), the first case portion (1) comprises a first sealing surface (10), the second case portion (2) comprises a second sealing surface (20), and the first sealing surface (10) and the second sealing surface (20) match to each other to form a sealing interface; the first sealing member (3) is arranged at the sealing interface to seal the first sealing surface (10) and the second sealing surface (20); the first fastening members (4) pass through the first sealing surface (10) and the second sealing surface (20) to connect the first sealing surface (10) and the second sealing surface (20) to clamp the first sealing member (3), so that the first sealing surface (10) and the second sealing surface (20) are sealedly connected; the first fastening members (4) are completely located on the outer side of the sealed cavity (101), and in the direction of extension of the sealing interface, the first fastening members (4) are located on the side of the first sealing member (3) away from the sealed cavity (101).

Description

Battery box, battery and electrical device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202323280853.9 and application date of November 30, 2023, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery box, a battery, and an electrical device. Background Art

[0004] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role, but the sealing reliability of existing battery boxes needs to be improved.

[0005] Summary of the Invention

[0006] The present application proposes a battery box, a battery and an electrical device, which are beneficial to improving the sealing reliability of the battery box.

[0007] In the first aspect, an embodiment of the present application provides a battery case, comprising: a first case and a second case, which are sealed and connected to form a sealed cavity, the first case including a first sealing surface, the second case including a second sealing surface, the first sealing surface and the second sealing surface cooperate with each other to form a sealed interface; a first seal, the first seal is arranged at the sealing interface to seal the first sealing surface and the second sealing surface; a first fastener, the first fastener is passed through the first sealing surface and the second sealing surface to connect the two and clamp the first seal, so that the first sealing surface and the second sealing surface are sealed and connected; the first fastener is completely located on the outside of the sealed cavity, and along the extension direction of the sealing interface, the first fastener is located on the side of the first seal away from the sealed cavity.

[0008] In the above technical solution, the first fastener and the first seal are staggered and connected via the fastening of the first fastener, so that the first sealing surface and the second sealing surface clamp the first seal to achieve a sealed fit. The first seal is isolated between the sealing cavity and the first fastener, improving the connection between the sealing cavity and the outside through the pores penetrated by the first fastener, which is beneficial to improving the sealing of the battery case. When a certain first fastener or a small number of first fasteners fail, the stable connection of the battery case and the sealing of the battery case can still be maintained, reducing the risk of sealing failure of the battery case after the failure of the first fastener, improving the sealing reliability of the battery case, and improving the working safety of the battery using the battery case of this application.

[0009] In some embodiments, the first box body has an adjacent first mating portion and a first connecting portion, the second box body has an adjacent second mating portion and a second connecting portion, the first seal is located between the first mating portion and the second mating portion, and the first fastener is connected to the first connecting portion and the second connecting portion so that the first mating portion and the second mating portion clamp the first seal.

[0010] In the above technical solution, the first matching part and the second matching part are used for sealing matching, and the first fastener clearly divides the first connecting part and the second connecting part, the first matching part, the second matching part, the first connecting part and the second connecting part, and the structure is clear, which is conducive to saving the manufacturing cost of the battery box.

[0011] In some embodiments, the second connecting portion is provided with a plurality of spaced connecting holes for the first fastener to pass through, and the second connecting portion is also provided with a lifting hole, at least one lifting hole is located between two adjacent connecting holes, and the first connecting portion is provided with an avoidance gap, and the avoidance gap corresponds to the number and position of the lifting holes.

[0012] In the above technical solution, by setting the lifting hole on the second connecting part and separating the lifting hole from the first connecting part and the second connecting part for clamping the first sealing member for sealing, the risk of battery box sealing failure caused by the lifting hole being deformed under force during the lifting process can be reduced, the sealing reliability of the battery box can be improved, and the working safety of the battery using the battery box of this application can be improved.

[0013] In some embodiments, the second box includes a supporting plate and two second connecting portions arranged opposite to each other along the first direction, and the second connecting portions are configured as side surfaces of the supporting plate perpendicular to the first direction.

[0014] In the above technical solution, by disposing the second connecting portion on the side of the supporting plate, the connection between the second connecting portion and the first connecting portion is facilitated, thereby improving the assembly efficiency of the battery box.

[0015] In some embodiments, the second box further includes two extension plates, which are arranged opposite to each other along the first direction and are both connected to the supporting plate. There are two second matching portions, which are respectively located on one side of the two extension plates away from the first matching portion.

[0016] In the above technical solution, by arranging the second matching portion adjacent to the second connecting portion, the clamping effect of the first fastener on the first matching portion and the second matching portion can be improved, which is beneficial to improving the sealing of the battery box.

[0017] In some embodiments, the first fastener is further provided through the extension plate to connect the first connection portion, the second connection portion and the extension plate.

[0018] In the above technical solution, by using the first fastener connecting the supporting plate and the first connecting part to fix the extension plate to the supporting plate, the assembly process of connecting the extension plate and the first connecting part to the supporting plate respectively can be reduced, thereby reducing the manufacturing cost of the battery box and improving the assembly efficiency of the battery box.

[0019] In some embodiments, the second box body also includes two extended walls arranged opposite to each other along a second direction, the second direction is arranged to intersect with the first direction, the first box body includes a top plate arranged opposite to the supporting plate, the surface of the extended wall facing away from the supporting plate is a third sealing surface, the surface of the top plate facing the extended wall is a fourth sealing surface, and a second sealing member is sandwiched between the third sealing surface and the fourth sealing surface.

[0020] In the above technical solution, the sealing cooperation between the first sealing surface and the second sealing surface, and the sealing cooperation between the third sealing surface and the fourth sealing surface completely surround the sealing cavity, thereby improving the sealing reliability of the sealing cavity.

[0021] In some embodiments, the battery case further includes a second fastener, which sequentially passes through the fourth sealing surface, the second sealing member, and the third sealing surface and is locked to the extension wall, and the second fastener is completely located outside the sealed cavity.

[0022] In the above technical solution, the second fastener penetrates the second seal to securely connect the fourth seal to the third seal, while also sealing the fourth sealing surface against the third sealing surface. This reduces the area required for staggered placement of the second seal and second fastener, reduces the space occupied by the battery case, and facilitates a more compact battery case design. Furthermore, the second fastener is completely located outside the sealed cavity, preventing the sealed cavity from connecting to the exterior of the battery case through the penetration of the second fastener, thereby enhancing the sealing performance of the battery case.

[0023] In some embodiments, the first sealing member and the second sealing member are integrally formed in a ring shape.

[0024] In the above technical solution, the first seal and the second seal have strong integrity, which can improve the situation where the sealed cavity is connected to the outside through the gap between the connecting ends of the first seal and the second seal, which is beneficial to improving the sealing of the battery box.

[0025] In some embodiments, the extension wall is fully welded to the carrier plate.

[0026] In the above technical solution, the extension wall is fully welded to the supporting plate, which can improve the structural strength of the second box body and enhance the working safety of the battery box body.

[0027] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell and the above-mentioned battery case, wherein the battery cell is disposed in a sealed cavity.

[0028] In the above technical solution, since the battery adopts the above-mentioned battery box, the sealing reliability of the battery can be improved, thereby improving the working reliability and use safety of the battery.

[0029] In a third aspect, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery, which is used to provide electrical energy.

[0030] In the above technical solution, since the electrical device adopts the above battery, the reliability and safety of the electrical device can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0033] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0034] FIG3 is a schematic structural diagram of a battery box provided in some embodiments of the present application;

[0035] FIG4 is an exploded view of a battery box provided in some embodiments of the present application;

[0036] FIG5 is a front view of a battery box provided in some embodiments of the present application;

[0037] FIG6 is a cross-sectional view taken along line AA in FIG5 ;

[0038] FIG7 is an enlarged view of the circled portion B in FIG6 ;

[0039] FIG8 is an enlarged view of the circled portion C in FIG3 ;

[0040] FIG9 is an exploded view of a portion of the second housing in some embodiments of the present application;

[0041] FIG10 is an enlarged view of the circled portion D in FIG9 .

[0042] Figure numerals: electrical device 1000, controller 300, motor 400, battery 200, battery case 100, sealed cavity 101, battery cell 110, first direction X, second direction Y, third direction Z, first case 1, first sealing surface 10, first matching part 1a, first connecting part 1b, avoidance gap 1b1, top plate 11, fourth sealing surface 111, first plate part 112, second plate part 113, second case 2, second sealing surface 20, second matching part 2a, second connecting part 2b, connecting hole 2b1, lifting hole 2b2, supporting plate 21, cavity 211, extension plate 22, extension wall 23, third sealing surface 231; first seal 3, first fastener 4, rivet nut 40, second fastener 5, second seal 6. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0045] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0046] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0047] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of the present application shown in the drawings are only for illustrative purposes and should not constitute any limitation on the present application; the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "axial", "radial", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0048] The term "plurality" used in this application refers to two or more (including two).

[0049] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0050] The battery referred to in the embodiments of this application refers to a single physical module that includes multiple battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may be a battery module or battery pack. A battery module generally includes multiple battery cells. A battery generally includes a casing for enclosing multiple battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells. Of course, the battery may also not include a casing.

[0051] For example, a battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive and negative electrode sheets and separators.

[0052] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and electrically connected to the positive electrode column. For example, the stacked multiple positive electrode tabs can be directly welded to the positive electrode column to form an electrical connection. Alternatively, the battery cell assembly may further include a positive electrode adapter. The stacked multiple positive electrode tabs are welded to one end of the positive electrode adapter, and the other end of the positive electrode adapter is welded to the positive electrode column to form an electrical connection between the positive electrode tab and the positive electrode column.

[0053] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode column. For example, the multiple stacked negative electrode tabs can be directly welded to the negative electrode column to form an electrical connection; alternatively, the battery cell assembly can further include a negative electrode adapter. The multiple stacked negative electrode tabs are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode column to form an electrical connection between the negative electrode tab and the negative electrode column. The material of the separator is not limited, and can be, for example, polypropylene or polyethylene.

[0054] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, batteries, as the power source, play an irreplaceable and important role. The battery case isolates and protects the internal battery cells, and the sealing reliability of the battery case directly affects the operational safety of the battery.

[0055] In related art, the battery case is formed by combining an upper cover and a lower shell, which are connected by a seal at the junction of the upper cover and the lower shell to seal the interior of the battery case. Fasteners are then used to directly pass through the upper cover, the seal, and the lower shell to fasten the battery case together. The fasteners not only securely connect the upper and lower covers, but also press the seal against the upper cover and the lower shell to seal the battery case. However, if one of the fasteners fails in this method, the risk of failure of the seal near the failed fastener is greatly increased, which can easily cause the seal of the battery case to fail.

[0056] Based on the above considerations, in order to further improve the sealing reliability of the battery case, an embodiment of the present application proposes a battery case, which includes: a first case, a second case, a first seal and a first fastener. The first case and the second case are sealed and connected to form a sealed cavity. The first case includes a first sealing surface, and the second case includes a second sealing surface. The first sealing surface and the second sealing surface cooperate with each other to form a sealing interface. The first seal is provided at the sealing interface to seal the first sealing surface and the second sealing surface. The first fastener is provided through the first sealing surface and the second sealing surface to connect and clamp the first seal so that the first sealing surface and the second sealing surface are sealed. The first fastener is completely located outside the sealed cavity. Along the extension direction of the sealing interface, the first fastener is located on the side of the first seal away from the sealed cavity.

[0057] In the above technical solution, by staggering the first fastener and the first seal, the first sealing surface and the second sealing surface clamp the first seal to achieve a sealed fit through the fastening connection of the first fastener. The first seal is isolated between the sealing cavity and the first fastener, improving the connection between the sealing cavity and the outside through the pores penetrated by the first fastener, which is beneficial to improving the sealing of the battery case. When a certain first fastener or a small number of first fasteners fail, the stable connection of the battery case and the sealing of the battery case can still be maintained, reducing the risk of sealing failure of the battery case after the failure of the first fastener, improving the sealing reliability of the battery case, and improving the working safety of the battery using the battery case of this application.

[0058] The embodiments of the present application provide an electric device using the battery disclosed herein as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0059] For the convenience of description, the following embodiments take the electric device 1000 as a vehicle as an example, and describe in detail the structures of the electric device 1000, the battery 200 and the battery box 100 of the present application.

[0060] Please refer to Figure 1, which is a schematic structural diagram of a vehicle in which the power-consuming device 1000 provided in some embodiments of the present application is a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery 200, and the battery 200 can be arranged at the bottom, head or tail of the vehicle. The battery 200 can be used to power the vehicle, for example, the battery 200 can be used as an operating power source for the vehicle. The vehicle may also include a controller 300 and a motor 400, and the controller 300 is used to control the battery 200 to power the motor 400, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 200 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0061] Please refer to Figure 2, which is an exploded view of a battery cell 110 used in a battery 200 according to some embodiments of the present application. Battery 200 includes a battery case 100 and a plurality of battery cells 110, with the battery cells 110 housed within the battery case 100. The battery case 100 is used to provide assembly space for the battery cells 110 and can adopt a variety of structures.

[0062] In some embodiments, the battery case 100 may include a first case 11 and a second case 12. The first case 11 and the second case 12 cover each other, and the first case 11 and the second case 12 jointly define a storage space 110 for accommodating a battery cell 110. The first case 11 may be a hollow structure with one end open, and the second case 12 may be a plate-like structure. The second case 12 covers the open side of the first case 11, so that the first case 11 and the second case 12 jointly define the storage space 110. Alternatively, the first case 11 and the second case 12 may both be hollow structures with one end open (for example, as shown in FIG. 2 ), with the open side of the first case 11 covering the open side of the second case 12. Of course, the battery case 1 formed by the first case 11 and the second case 12 may have various shapes, such as a cylinder or a rectangular parallelepiped.

[0063] In the battery 200, the multiple battery cells 110 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 110. The multiple battery cells 110 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 110 can be housed within the battery case 100. Alternatively, the battery 200 can be constructed by first connecting the multiple battery cells 110 in series, in parallel, or in a hybrid connection to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid connection to form an entire battery module, which is then housed within the battery case 100. The battery 200 may also include other structures. For example, the battery 200 may also include a busbar to electrically connect the multiple battery cells 110.

[0064] Each battery cell 110 may be a secondary battery or a primary battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 110 may be cylindrical, flat, rectangular, or in other shapes.

[0065] Referring to Figures 3, 4, and 7, in the embodiment of the present application, a battery case 100 includes: a first case 1 and a second case 2. The first case 1 and the second case 2 are the main components of the battery case 100. The second case 2 and the first case 1 are interconnected to jointly define a sealed cavity 101 for accommodating a battery cell 110. The first case 1 and the second case 2 jointly protect the battery cell 110 disposed in the sealed cavity 101. The first case 1 includes a first sealing surface 10, and the second case 2 includes a second sealing surface 20. The first sealing surface 10 and the second sealing surface 20 cooperate to form a sealed interface.

[0066] The battery case 100 also includes a first seal 3, which is disposed at the sealing interface, that is, between the first sealing surface 10 and the second sealing surface 20. The first seal 3 is provided between the first sealing surface 10 and the second sealing surface 20 to provide a sealing fit, thereby improving the sealing performance of the battery case 100. The first seal 3 can be a component having sealing properties and disposed between the first sealing surface 10 and the second sealing surface 20.

[0067] The battery case 100 further includes a first fastener 4, which penetrates the first sealing surface 10 and the second sealing surface 20 to connect the two, thereby fixedly connecting the first case 1 and the second case 2. Furthermore, the first fastener 4 penetrates the first sealing surface 10 and the second sealing surface 20 and clamps the first sealing member 3, thereby sealing the first sealing surface 10 and the second sealing surface 20, thereby improving the sealing performance of the battery case 100.

[0068] The first fastener 4 is completely located outside the sealed cavity 101, and the sealed cavity 101 is not connected to the outside of the battery case 100 through the first fastener 4, which helps improve the sealing of the battery case 100. In addition, along the extension direction of the sealing interface, the first fastener 4 is located on the side of the first sealing member 3 away from the sealed cavity 101.

[0069] It is worth noting that the sealing interface is arranged along at least a portion of the sealing cavity 101, surrounding the sealing cavity 101. The sealing interface is further arranged at the edge of the sealing cavity 101, thereby enclosing the sealing cavity 101. In the surface direction of the sealing interface, the direction toward the center of the sealing cavity is the extension direction of the sealing interface, and the first fastener 4 is arranged away from the sealing cavity 101 relative to the first sealing member 3. For example, taking the sealing interface extending in the vertical direction shown in Figure 7 as an example, the sealing interface is arranged adjacent to the bottom end of the sealing cavity 101, and the center of the sealing cavity 101 is located above the sealing interface. Therefore, the extension direction K is from bottom to top, and the first fastener 4 is located below the first sealing member 3.

[0070] The first fastener 4 and the first seal 3 of the embodiment of the present application are staggered. Compared to the design method of inserting the fastener through the seal to simultaneously seal and tighten, the present application staggers the first fastener 4 and the first seal 3, eliminating the need for the first fastener 4 to be inserted through the first seal 3. Therefore, it is not necessary to provide holes for the first fastener 4 to be installed on the first seal 3 and the first sealing surface 10 and the second sealing surface 20 of the sandwiched first seal. This effectively alleviates the problem of seal failure caused by loosening or failure of individual first fasteners 4, which results in pores connecting the inside and outside, thereby improving the sealing stability between the first housing 1 and the second housing 2. Furthermore, the present application does not require holes for the first fastener 4 to pass through on the first seal 3 and the first sealing surface 10 and the second sealing surface 20 of the sandwiched first seal. This alleviates the problem that pores can easily lead to seal failure of the battery housing 100 due to failure of individual first fasteners 4, thereby eliminating the need to densely distribute the first fasteners 4 to increase the tightening force in order to reduce the impact of pores, thereby reducing costs. In addition, by staggering the first fastener 4 and the first seal 3, there is no need to pass the first fastener 4 through the first seal 3, so the width of the first seal 3 can be selected more freely. It is not necessary to set the width of the first seal 3 larger in order to improve the problem of sealing failure that is prone to occur in the opening, which is conducive to appropriately reducing the width of the first seal 3, thereby reducing costs.

[0071] When all the first fasteners 4 are working normally, multiple first fasteners 4 connect and clamp the first sealing surface 10 and the second sealing surface 20, and fix the first box body 1 and the second box body 2 together. Due to the action of multiple first fasteners 4, the first sealing surface 10 and the second sealing surface 20 are tightly sealed through the first seal 3, and the battery box body 100 seals and protects the internal sealed cavity 101.

[0072] When one or a small number of first fasteners 4 fail, the remaining first fasteners 4 still work normally and can securely connect the first housing 1 and the second housing 2. Since the connecting portion and the sealing portion are separated, the first fasteners 4 and the first seal 3 are staggered. When only one or a small number of first fasteners 4 fail, the remaining first fasteners 4 work normally, and the tightening force applied to the first sealing surface 10 and the second sealing surface 20 of the first seal 3 will not be significantly lost. The normally working first fasteners 4 can still ensure a stable sealing fit between the first sealing surface 10 and the second sealing surface, thereby improving the sealing reliability of the battery housing 100. Furthermore, since the first fasteners 4 are not fixed to the first seal 3, when a first fastener 4 fails, no pores connecting the inside and the outside will be generated on the first seal 3. This effectively improves the problem of sealing failure caused by pores when individual first fasteners 4 fail, further improving the sealing reliability.

[0073] In the above technical solution, by staggering the first fastener 4 and the first seal 3, the first sealing surface 10 and the second sealing surface 20 are clamped to the first seal 3 to achieve a sealed fit through the fastening connection of the first fastener 4. The first seal 3 is isolated between the sealed cavity 101 and the first fastener 4, improving the connection between the sealed cavity 101 and the outside through the pores penetrated by the first fastener 4, which is beneficial to improving the sealing of the battery case 100. When a certain first fastener 4 or a small number of first fasteners 4 fail, the stable connection of the battery case 100 and the sealing of the battery case 100 can still be maintained, reducing the risk of sealing failure of the battery case 100 after the failure of the first fastener 4, improving the sealing reliability of the battery case 100, and improving the working safety of the battery using the battery case 100 of this application.

[0074] Please refer to Figures 3 and 4. The first box body 1 has an adjacent first matching portion 1a and a first connecting portion 1b, the second box body 2 has an adjacent second matching portion 2a and a second connecting portion 2b, the first seal 3 is located between the first matching portion 1a and the second matching portion 2a, and the first fastener 4 is connected to the first connecting portion 1b and the second connecting portion 2b so that the first matching portion 1a and the second matching portion 2a clamp the first seal 3.

[0075] At least portions of the first mating portion 1a and the first connecting portion 1b together form a first sealing surface 10, and at least portions of the second mating portion 2a and the second connecting portion 2b together form a second sealing surface 20. A first sealing member 3 is disposed between the first mating portion 1a and the second mating portion 2a. A first fastener 4 is connected to the first connecting portion 1b and the second connecting portion 2b to penetrate the first sealing surface 10 and the second sealing surface 20, thereby clamping the first mating portion 1a and the second mating portion 2a together.

[0076] Among them, the first sealing surface 10 is formed on the side of the first matching part 1a facing the second matching part 2a, and the second sealing surface 20 is formed on the side of the second matching part 2a facing the first matching part 1a, so that the first matching part 1a and the second matching part 2a are arranged relative to each other to clamp the first sealing member 3.

[0077] In the above technical solution, the first matching part 1a and the second matching part 2a are used for sealing matching, and the first fastener 4 connects the first connection part 1b and the second connection part 2b. The first matching part 1a, the second matching part 2a, the first connection part 1b and the second connection part 2b have clear division of labor and clear structure, which is conducive to saving the manufacturing cost of the battery box 100.

[0078] Please refer to Figures 3 and 4. In some embodiments of the present application, the second connecting portion 2b is provided with a plurality of spaced connecting holes 2b1, and the connecting holes 2b1 are for the first fastener 4 to pass through. The second connecting portion 2b is also provided with a lifting hole 2b2, and at least one lifting hole 2b2 is located between two adjacent connecting holes. The first connecting portion 1b is provided with an avoidance notch 1b1, and the avoidance notch 1b1 corresponds to the number and position of the lifting holes 2b2.

[0079] The first fastener 4 is provided with a connection hole 2b1 and is fastened to the first connection portion 1b. A plurality of connection holes 2b1 are arranged at intervals on the second connection portion 2b. Accordingly, a plurality of first fasteners 4 are provided in a one-to-one correspondence with the connection holes 2b1. By arranging a plurality of first fasteners 4 at intervals to fasten the first connection portion 1b and the second connection portion 2b, the force applied to the first connection portion 1b and the second connection portion 2b can be uniformed, thereby firmly clamping the first sealing surface 10 and the second sealing surface 20 to the first sealing member 3 and improving the sealing reliability of the battery case 100. Even if one or a small number of first fasteners 4 fail, the battery case 100 can still be stably connected and the sealing of the battery case 100 maintained, reducing the risk of sealing failure of the battery case 100 after the failure of the first fastener 4, improving the sealing reliability of the battery case 100, and improving the operating safety of the battery using the battery case 100 of the present application.

[0080] The second connecting portion 2b is further provided with a lifting hole 2b2, which is used to cooperate with a lifting tool to lock the lifting tool with the battery case 100. The lifting tool is used to move the battery case 100, facilitating transportation and relocation of the battery case 100. Furthermore, by providing an avoidance notch 1b1 on the first connecting portion 1b (see Figure 8), the avoidance notch 1b1 avoids the provision of the lifting opening 2b2, thereby reducing interference between the first case 1 and the lifting tool and the lifting hole 2b2, and improving the stability of the lifting operation.

[0081] By setting the lifting hole 2b2 on the second connecting part 2b and separating the lifting hole 2b2 from the first connecting part 1a and the second connecting part 2a used to clamp the first sealing member 3 for sealing, the risk of sealing failure of the battery case 100 caused by the lifting hole 2b2 being deformed under force during the lifting process of the battery case 100 can be reduced, the sealing reliability of the battery case 100 can be improved, and the working safety of the battery using the battery case 100 of this application can be improved.

[0082] In the above technical solution, by setting the lifting hole 2b2 on the second connecting part 2b, the lifting hole 2b2 is separated from the first connecting part 1a and the second connecting part 2a for clamping the first sealing member 3 for sealing. This can reduce the risk of sealing failure of the battery box 100 caused by the lifting hole 2b2 being deformed by force during the lifting process of the battery box 100, thereby improving the sealing reliability of the battery box 100 and improving the working safety of the battery using the battery box 100 of this application.

[0083] 3 , in some embodiments of the present application, there are multiple hoisting holes 2b2 that are spaced apart along the second connecting portion 2b. During hoisting operations, the battery box 100 is evenly stressed, thereby improving the safety of the battery box 100.

[0084] In some embodiments, as shown in Figure 5, the connection holes 2b1 adjacent to the lifting hole 2b2 are arranged more densely, which improves the connection tightness of the first connection part 1b and the second connection part 2b at the lifting hole 2b2, and can reduce the risk of sealing failure of the battery box 100 caused by the deformation of the lifting hole 2b2 during the lifting process of the battery box 100, thereby improving the sealing reliability of the battery box 100 and improving the working safety of the battery using the battery box 100 of the present application.

[0085] 4 and 10 , in some embodiments of the present application, the second box body 2 includes a supporting plate 21 and two second connecting portions 2b arranged opposite to each other along the first direction X, and the second connecting portions 2b are configured such that the supporting plate 21 is perpendicular to the side surface of the first direction X.

[0086] Correspondingly, referring to Figure 4 , two first connecting portions 1b are also provided, disposed opposite each other along the first direction X. The first fastener 4 penetrates the first connecting portion 1b and the second connecting portion 2b, allowing the first mating portion 1a and the second mating portion 2a to clamp the first sealing member 3. The second connecting portion 2b is disposed on the side of the carrier plate 21 to facilitate connection between the second connecting portion 2b and the first connecting portion 1b, thereby improving assembly efficiency of the battery case 100.

[0087] It is worth noting that the supporting plate 21 is not a straight plate, but rather a plate-shaped member having certain structural features in the thickness direction. The second connecting portion 2b is provided at least on the side of the supporting plate 21 perpendicular to the first direction X. The length direction of the supporting plate 21 extends along the second direction Y, and the width direction of the supporting plate 21 is the first direction X. The second connecting portion 2b is provided on both sides of the first direction X.

[0088] The two second connection parts 2b are spaced apart along the first direction X, the length direction of the second connection part 2b extends along the second direction Y, and the width direction of the second connection part 2b extends along the third direction Z. The first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0089] The second connection part 2b is provided with a plurality of connection holes 2b1 spaced apart along the length direction of the second connection part 2b to stably connect the second connection part 2b and the first connection part 1b, that is, the plurality of connection holes 2b1 are spaced apart along the second direction.

[0090] In the above technical solution, by disposing the second connecting portion 2 b on the side of the carrier plate 21 , the connection between the second connecting portion 2 b and the first connecting portion 1 b is facilitated, thereby improving the assembly efficiency of the battery box 100 .

[0091] Please refer to Figures 4 and 10. In some embodiments of the present application, the two sides of the first direction of the supporting plate 21 are formed into a bent structure, and a cavity 211 is formed inside the two sides of the first direction of the supporting plate 21. Compared with a flat plate structure, designing the supporting plate 21 as a structure with a cavity 211 can improve the structural strength of the second box body 2 and improve the impact resistance, thereby improving the working safety of the battery using the battery box body 100 of the present application.

[0092] For example, referring to Figures 7 and 10 , both sides of the support plate 21 in the first direction are formed into a ⌚-shaped structure with cavities 211. Specifically, the inner side of the second connecting portion 2b is formed with cavities 211. When the first fastener 4 passes through the connecting hole 2b1, a portion of the first fastener 4 extends into the cavity 211. The first fastener 4 is then passed through the second connecting portion 2b and fixedly connected to the first connecting portion 2b. The provision of cavities 211 facilitates the insertion of the first fastener 4, thereby improving the connection stability between the first and second housings 1 and 2.

[0093] Referring to FIG. 3 , FIG. 5 and FIG. 7 , in some embodiments of the present application, the first fastener 4 is a rivet nut 40 .

[0094] In the above technical solution, the first connecting portion 1b and the second connecting portion 3b are fixedly connected by the rivet nut 40. Compared with ordinary bolt connections, the mounting hole of the rivet nut 40 does not require tapping internal threads or welding nuts, which is convenient to use and can improve installation efficiency. In addition, the rivet nut 40 has a firm riveting connection and strong connection stability.

[0095] In some embodiments of the present application, please refer to Figure 7, part of the rivet nut 40 extends into the cavity 211 inside the second connecting part 2b, and the rivet nut 40 clamps the first connecting part 1b and the second connecting part 2b to fix the first box body 1 and the second box body, and enables the first matching part 1a and the second matching part 1b to clamp the first sealing member 3 to seal and protect the sealing cavity 101.

[0096] 4 and 10 , in some embodiments of the present application, the second box body 2 further includes two extension plates 22 , which are arranged opposite to each other along the first direction X and are both connected to the supporting plate 21 , and there are two second matching portions 2a formed on the two extension plates 22 , respectively.

[0097] Correspondingly, referring to FIG. 4 , there are also two first matching portions 1 a and the first matching portions 1 a are disposed opposite to each other along the first direction X. The first matching portions 1 a and the second matching portions 2 a are disposed opposite to each other to clamp the first sealing member 3 .

[0098] The second matching portion 2a is disposed adjacent to the second connecting portion 2b so that after the first fastener 4 securely connects the first connecting portion 1b and the second connecting portion 2b, the second matching portion 2a and the first matching portion 2b clamp the first sealing member 3 to seal and protect the sealing cavity 101.

[0099] In the above technical solution, by arranging the second matching portion 2a adjacent to the second connecting portion 2b, the clamping effect of the first fastener 4 on the first matching portion 1a and the second matching portion 2a can be improved, which is beneficial to improving the sealing of the battery box 100.

[0100] Referring to Figure 7 , in some embodiments of the application, the first fastener 4 is further provided through the extension plate 22 to connect the first connecting portion 1b, the second connecting portion 2b, and the extension plate 22. Referring to Figure 10 , the extension plate 22 is also provided with a through-hole for the first fastener 4 to pass through, and the first fastener 4 passes through the through-hole to securely connect the extension plate 22. Compared to connecting the extension plate 22 to the carrier plate 21 through bonding or welding, directly securing the extension plate 22 to the carrier plate 21 with the first fastener 4 connecting the carrier plate 21 and the first connecting portion 1b can reduce the number of assembly steps for the battery case 100, lower manufacturing costs, and improve assembly efficiency.

[0101] In the above technical solution, by using the first fastener 4 connecting the supporting plate 21 and the first connecting part 1b to fix the extension plate 22 to the supporting plate 21, the assembly process of connecting the extension plate 21 and the first connecting part 1b to the supporting plate 21 respectively can be reduced, thereby reducing the manufacturing cost of the battery box 100 and improving the assembly efficiency of the battery box 100.

[0102] Please refer to Figure 4. In some embodiments of the present application, the second box body 2 also includes two extension walls 23 arranged opposite to each other along the second direction Y, the second direction Y is arranged to intersect with the first direction X, and the first box body 1 includes a top plate 11 arranged opposite to the supporting plate 21. The surface of the extension wall 23 facing away from the supporting plate 21 is a third sealing surface 231, and the surface of the top plate 11 facing the extension wall is a fourth sealing surface 111. A second sealing member 6 is sandwiched between the third sealing surface 231 and the fourth sealing surface 111.

[0103] A first seal 3 is sandwiched between the first sealing surface 10 and the second sealing surface 20, and a second seal 6 is sandwiched between the third seal 231 and the fourth seal 111. The sealing cooperation between the first sealing surface 10 and the second sealing surface 20, and the sealing cooperation between the third sealing surface 231 and the fourth sealing surface 111 completely surround the sealing cavity 101, thereby improving the sealing reliability of the sealing cavity 101.

[0104] In the above technical solution, the sealing cooperation between the first sealing surface 10 and the second sealing surface 20, and the sealing cooperation between the third sealing surface 231 and the fourth sealing surface 111 completely surround the sealing cavity 101, thereby improving the sealing reliability of the sealing cavity 101.

[0105] In some embodiments of the present application, the battery case 100 further includes a second fastener 5, which passes through the fourth sealing surface 111, the second sealing member 6 and the third sealing surface 231 in sequence and is locked to the extension wall 23, and the second fastener 5 is completely located outside the sealed cavity 101.

[0106] The second fastener 5 is completely located outside the sealed cavity 101 , and the sealed cavity 101 is not connected to the outside of the battery box 100 through the second fastener 5 , which is beneficial to improving the sealing performance of the battery box 100 .

[0107] In the above technical solution, the second fastener 5 penetrates the second sealing member 6 to securely connect the fourth sealing member 111 and the third sealing member 231, while also sealing the fourth sealing surface 11 and the third sealing surface 231. This saves the layout area of ​​the second sealing member 6 and the second fastener 5 when they are staggered, reduces the space occupied by the battery case 100, and facilitates the miniaturization of the battery case 100. Furthermore, the second fastener 5 is completely located outside the sealed cavity 101, and the sealed cavity 101 is not connected to the exterior of the battery case 100 through the penetration of the second fastener 5, which helps to improve the sealing performance of the battery case 100.

[0108] 4 , the second box body 2 includes a supporting plate 21 and two extending walls 23 oppositely arranged along the second direction Y. Correspondingly, the first box body 1 includes a top plate 11 , which includes a first plate portion 112 and two second plate portions 113 oppositely arranged along the first direction X.

[0109] A first sealing surface 10 is formed on the end of the second plate portion 113 away from the first plate portion 112. Two first mating portions 1a and two second connecting portions 1b are formed, extending along the second direction Y. Second connecting portions 2b are formed on both sides of the support plate 21 in the first direction X. Two second connecting portions 2b extend along the second direction Y. An extension plate 22 is connected to the support plate 21 and is formed with two second mating portions 2a and 2b, extending along the second direction X.

[0110] The first connecting portion 1b and the second connecting portion 2b are fixedly connected by a first fastener 4. The first matching portion 2a and the second matching portion 2b are sandwiched with a first sealing member 3 to seal the two pairs of edges of the first box body 1 and the second box body 2 extending along the second direction Y.

[0111] The surface of the extension wall 23 facing away from the carrier plate 21 is the third sealing surface 231. It is worth noting that the third sealing surface 231 is set away from the carrier plate 21. The "away" should be understood in a broad sense. Anything not directly connected to the carrier plate 21 can be understood as being set away from the carrier plate 21.

[0112] Each extension wall 23 includes a third sealing surface 231 extending along the first direction X, and two third sealing surfaces 231 extending along the third direction Z; each second plate portion 113 includes two fourth sealing surfaces 111 extending along the third direction Z, and the first plate portion 112 also includes two fourth sealing surfaces 111 extending along the first direction X.

[0113] A second sealing member 6 is sandwiched between the third sealing surface 231 and the fourth sealing surface 111. The second fastener 5 passes through the fourth sealing surface 111, the second sealing member 6 and the third sealing surface 231 in sequence and is locked to the extension wall 23 to seal the two pairs of edges of the first box body 1 and the second box body 2 extending along the first direction X, as well as the four pairs of edges extending along the third direction Z.

[0114] In some embodiments of the present application, the first sealing member 3 and the second sealing member 6 are integrally formed into a ring shape. The first sealing member 3 and the second sealing member 6 have a strong integrity, which can improve the sealing effect of the sealed cavity 101. Compared with the first sealing member 3 and the second sealing member 6 being connected as separate parts, the sealed cavity 101 can be less likely to communicate with the outside world through the gap between the connecting ends of the first sealing member 3 and the second sealing member 6, which is beneficial to improving the sealing of the battery case 100.

[0115] In the above technical solution, the first seal 3 and the second seal 6 have strong integrity, which can improve the situation where the sealed cavity 101 is connected to the outside through the gap between the connecting ends of the first seal 3 and the second seal 6, which is beneficial to improving the sealing of the battery box 100.

[0116] In some embodiments of the present application, the extension wall 22 is fully welded to the supporting plate 21 .

[0117] In the above technical solution, the extension wall 22 is fully welded to the supporting plate 21 , which can improve the structural strength of the second box body 2 and enhance the working safety of the battery box body.

[0118] In a second aspect, an embodiment of the present application provides a battery 200 , including a battery cell 110 and the aforementioned battery case 100100 , wherein the battery cell 110 is accommodated in a sealed cavity 101 .

[0119] In the above technical solution, since the battery 200 adopts the above-mentioned battery case 100100, the sealing reliability of the battery 200 can be improved, thereby improving the working reliability and use safety of the battery 200.

[0120] In a third aspect, an embodiment of the present application provides an electrical device 1000 , comprising the above-mentioned battery 200 , wherein the battery 200 is used to provide electrical energy.

[0121] In the above technical solution, since the power-consuming device 1000 adopts the above-mentioned battery 200 , the reliability and safety of the power-consuming device 1000 can be effectively improved.

[0122] Please refer to Figures 3 to 10 again to describe the battery box 100 of a specific embodiment of the present application.

[0123] In the embodiment of the present application, the battery case 100 includes: a first case 1, a second case 2, a first sealing member 3, and a first fastener 4. The battery case 100 is a rectangular parallelepiped, with the first case 1 positioned above the second case 2. The first case 1 includes a first plate portion 112 extending horizontally from the top. The first case 1 also includes two second plates 113 spaced apart in the front-to-back direction. The length of the second plates 113 extends in the left-to-right direction, and the first and second plates 112 and 113 are connected by a bend.

[0124] The second box body 2 includes a supporting plate 21 located below and extending horizontally. The second box body 2 also includes two extending walls 23 spaced apart in the left-right direction. The length of the extending walls 23 extends in the front-to-back direction. The supporting plate 21 and the extending walls 23 are connected by bending.

[0125] A first connecting portion 1b and a first matching portion 1a are formed at the lower end of the second plate portion 113, and a second matching portion 2a and a second connecting portion 2b are formed on the front and rear sides of the supporting plate 21. The first connecting portion 1b and the second connecting portion 2b are fixedly connected by a first fastener 4, and a first sealing member 3 is clamped between the first matching portion 2a and the second matching portion 2b to seal and match the two pairs of edges extending along the left and right directions of the first box body 1 and the second box body 2.

[0126] Fourth sealing surfaces 111 are provided at the left and right ends of the first plate portion 112, and four fourth sealing surfaces extending in the vertical direction are also provided on the second plate portion 113. Third sealing panels 231 are provided at the left and right ends of the upper side of the extension wall 13, and the extension wall 13 also includes four third sealing surfaces 231 extending in the vertical direction. A second sealing member 6 is sandwiched between the third sealing surface 231 and the fourth sealing surface 111. A second fastener 5 sequentially passes through the fourth sealing surface 111, the second sealing member 6, and the third sealing surface 231 and is locked to the extension wall 23, thereby sealing the two pairs of edges extending in the front-to-back direction of the first and second housings 1 and 2, and also sealing the two pairs of edges extending in the vertical direction of the first and second housings 1 and 2.

[0127] A lifting hole 2b2 is also provided at the second connecting portion 3b, and the lifting hole 2b2 is separated from the first mating portion 1a and the second mating portion 2a used for sealing. This can reduce the risk of sealing failure of the battery case 100 caused by deformation of the lifting hole 2b2 during the lifting process of the battery case 100, thereby improving the sealing reliability of the battery case 100 and the operating safety of the battery using the battery case 100 of the present application. If one or a small number of the first fasteners 4 fail, the battery case 100 can still be stably connected and the sealing of the battery case 100 maintained, reducing the risk of sealing failure of the battery case 100 after the failure of the first fasteners 4, thereby improving the operating safety of the battery using the battery case 100 of the present application.

[0128] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0129] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery box, wherein: include: A first box body and a second box body are sealed and connected to form a sealed cavity, the first box body includes a first sealing surface, the second box body includes a second sealing surface, and the first sealing surface and the second sealing surface cooperate with each other to form a sealing interface; a first sealing member, the first sealing member being disposed at the sealing interface to seal the first sealing surface and the second sealing surface; A first fastener, the first fastener is inserted through the first sealing surface and the second sealing surface to connect the two and clamp the first sealing member, so that the first sealing surface and the second sealing surface are sealed and connected; The first fastener is completely located outside the sealing cavity, and along the extension direction of the sealing interface, the first fastener is located on a side of the first sealing member away from the sealing cavity.

2. The battery case according to claim 1, wherein: The first box body has a first mating portion and a first connecting portion adjacent to each other, the second box body has a second mating portion and a second connecting portion adjacent to each other, the first seal is located between the first mating portion and the second mating portion, and the first fastener is connected to the first connecting portion and the second connecting portion so that the first mating portion and the second mating portion clamp the first seal.

3. The battery case according to claim 2, wherein: The second connection part is provided with a plurality of connection holes arranged at intervals, and the first fastener is passed through the connection holes. The second connection part is also provided with a lifting hole, at least one of the lifting holes is located between two adjacent connection holes, and the first connection part is provided with an avoidance notch, and the avoidance notch corresponds to the number and position of the lifting holes.

4. The battery case according to claim 2 or 3, wherein: The second box body includes a carrying plate and two second connecting portions arranged opposite to each other along a first direction, and the second connecting portions are configured as side surfaces of the carrying plate perpendicular to the first direction.

5. The battery case according to claim 4, wherein: The second box body further includes two extension plates, which are arranged opposite to each other along the first direction and are both connected to the supporting plate. There are two second matching portions, which are respectively formed on the two extension plates.

6. The battery case according to claim 5, wherein: The first fastener is also passed through the extension plate to connect the first connection portion, the second connection portion and the extension plate.

7. The battery case according to claim 5 or 6, wherein: The second box body also includes two extension walls arranged opposite to each other along a second direction, the second direction is arranged to intersect with the first direction, the first box body includes a top plate arranged opposite to the supporting plate, the surface of the extension wall facing away from the supporting plate is a third sealing surface, the surface of the top plate facing the extension wall is a fourth sealing surface, and a second sealing member is sandwiched between the third sealing surface and the fourth sealing surface.

8. The battery case according to claim 7, wherein: The battery box also includes a second fastener, which passes through the fourth sealing surface, the second sealing member and the third sealing surface in sequence and is locked to the extension wall, and the second fastener is completely located outside the sealing cavity.

9. The battery case according to claim 7 or 8, wherein: The first sealing member and the second sealing member are integrally formed in a ring shape.

10. The battery case according to any one of claims 7 to 9, wherein: The extension wall is fully welded to the bearing plate.

11. A battery, wherein: It comprises a battery cell and a battery case according to any one of claims 1 to 10, wherein the battery cell is arranged in the sealed cavity.

12. An electrical device, wherein: A battery according to claim 11, for providing electrical energy.

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