Battery box body, battery and electric device

Abstract

The utility model discloses a battery box body, a battery and a power utilization device, the battery box body comprises a first box body, a second box body, a first sealing piece and a first fastening piece, the first box body and the second box body are in sealing connection to form a sealing cavity, the first box body comprises a first sealing surface, and the second box body comprises a second sealing surface; the first sealing face and the second sealing face are matched to form a sealing interface, and the first sealing piece is arranged on the sealing interface to seal the first sealing face and the second sealing face. The first fastener penetrates through the first sealing face and the second sealing face to connect the first sealing face and the second sealing face to clamp the first sealing piece, so that the first sealing face and the second sealing face are connected in a sealed mode, the first fastener is completely located on the outer side of the sealing cavity, and the first fastener is located on the side, away from the sealing cavity, of the first sealing piece in the extending direction of the sealing interface. And when a certain first fastener or a small number of first fasteners fail, the sealing performance of the battery box body is still maintained, the failure risk is reduced, and the working safety is improved.

Description

Technical Field

[0001] 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

[0002] 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, while the sealing reliability of existing battery boxes needs to be improved. Utility Model Content

[0003] 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.

[0004] In a 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 comprising a first sealing surface, the second case comprising a second sealing surface, the first sealing surface and the second sealing surface cooperate with each other to form a sealing 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.

[0005] In the above technical solution, the first fastener and the first seal are staggered and connected via the fastening connection of the first fastener, so that the first sealing surface and the second sealing surface clamp the first seal to achieve sealing cooperation. The first seal is isolated between the sealing cavity and the first fastener, which improves the connection between the sealing cavity and the outside through the pores penetrated by the first fastener, which is beneficial to improve the sealing of the battery case. When one or a small number of the first fasteners fail, the stable connection of the battery case can still be maintained 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.

[0006] 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.

[0007] In the above technical solution, the first mating part and the second mating part are used for sealing and matching, and the first fastener clearly divides the first connecting part and the second connecting part, the first mating part, the second mating 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.

[0008] In some embodiments, the second connecting portion is provided with a plurality of connecting holes arranged at intervals, and the connecting holes are for the first fastener to pass through. The second connecting portion is also provided with a lifting hole, and at least one of the lifting holes is located between two adjacent connecting holes. The first connecting portion is provided with an avoidance notch, and the avoidance notch corresponds to the number and position of the lifting holes.

[0009] 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, thereby improving the sealing reliability of the battery box and improving the working safety of the battery using the battery box of this application.

[0010] In some embodiments, 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 sides of the carrying plate perpendicular to the first direction.

[0011] In the above technical solution, by configuring the second connecting portion on the side of the carrying plate, the connection between the second connecting portion and the first connecting portion is facilitated, thereby improving the assembly efficiency of the battery box.

[0012] In some embodiments, the second box body further includes two extension plates, the two extension plates are arranged opposite to each other along the first direction and are both connected to the supporting plate, and there are two second matching portions which are respectively located on one side of the two extension plates away from the first matching portion.

[0013] 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.

[0014] In some embodiments, the first fastener is further disposed through the extension plate to connect the first connection portion, the second connection portion, and the extension plate.

[0015] 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.

[0016] In some embodiments, 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.

[0017] 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.

[0018] In some embodiments, the battery case further includes a second fastener, which sequentially passes through the fourth sealing surface, the second seal and the third sealing surface and is locked to the extension wall, and the second fastener is completely located outside the sealing cavity.

[0019] In the above technical solution, the fourth seal and the third seal are fixedly connected by the second fastener penetrating the second seal, and the fourth sealing surface and the third sealing surface are sealed and matched, which can save the layout area of ​​the second seal and the second fastener staggered, reduce the space occupied by the battery box, and is conducive to the miniaturization design of the battery box. In addition, the second fastener is completely located outside the sealed cavity, and the sealed cavity will not be connected to the outside of the battery box through the penetration of the second fastener, which is conducive to improving the sealing of the battery box.

[0020] In some embodiments, the first seal and the second seal are integrally formed in a ring shape.

[0021] 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.

[0022] In some embodiments, the extension wall is fully welded to the supporting plate.

[0023] In the above technical solution, the extended wall is fully welded to the bearing plate, which can improve the structural strength of the second box body and improve the working safety of the battery box body.

[0024] 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 the sealed cavity.

[0025] In the above technical solution, since the battery adopts the above battery box, the sealing reliability of the battery can be improved, thereby improving the working reliability and use safety of the battery.

[0026] In a third aspect, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy.

[0027] In the above technical solution, since the electric device adopts the above battery, the reliability and safety of the electric device can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0030] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0031] Figure 3 A schematic diagram of the structure of a battery box provided in some embodiments of the present application;

[0032] Figure 4 An exploded view of a battery box provided in some embodiments of the present application;

[0033] Figure 5 A front view of a battery box provided for some embodiments of the present application;

[0034] Figure 6 for Figure 5 Sectional view along AA direction;

[0035] Figure 7 for Figure 6 An enlarged view of the circled section B;

[0036] Figure 8 for Figure 3 The enlarged view of the C part circled in the middle;

[0037] Fig. 9 An exploded view of a portion of the structure of the second housing in some embodiments of the present application;

[0038] Fig.10 for Fig. 9 Enlarged view of the circled D section.

[0039] Reference numerals:

[0040] Electric device 1000, controller 300, motor 400,

[0041] Battery 200, battery box 100, sealed cavity 101, battery cell 110,

[0042] First direction X, second direction Y, third direction Z,

[0043] The first box body 1, the first sealing surface 10, the first matching portion 1a, the first connecting portion 1b, the avoidance notch 1b1, the top plate 11, the fourth sealing surface 111, the first plate portion 112, the second plate portion 113,

[0044] The second box body 2, the second sealing surface 20, the second matching portion 2a, the second connecting portion 2b, the connecting hole 2b1, the hanging hole 2b2, the bearing plate 21, the cavity 211, the extension plate 22, the extension wall 23, and the third sealing surface 231;

[0045] First seal 3,

[0046] First fastener 4, rivet nut 40,

[0047] The second fastening member 5 and the second sealing member 6 . DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0050] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0051] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0052] 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 exemplary and should not constitute any limitation to the present application; the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "axial", "radial" and the like 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0053] The term "plurality" used in the present application refers to two or more (including two).

[0054] In the present 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 the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0055] The battery mentioned in the embodiments of the present application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may be a battery module or a battery pack. A battery module generally includes multiple battery cells. The battery generally includes a box for encapsulating multiple battery cells or multiple battery modules, and the box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery may not include a box.

[0056] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator.

[0057] Among them, the positive electrode sheet can generally include 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 sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter sheet, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0058] 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 sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter sheet, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0059] 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. The battery box isolates and protects the internal battery cells, and the sealing reliability of the battery box directly affects the working safety of the battery.

[0060] In the related art, the battery case is formed by combining an upper cover and a lower shell, and the upper cover and the lower shell are connected by a seal at the joint of the upper cover and the lower shell to seal the inside of the battery case; and the battery case is fastened and connected by fasteners that directly pass through the upper cover, the seal and the lower shell. The fasteners not only fix the upper cover and the lower cover, but also use the fasteners to press the seal with the upper cover and the lower shell to seal the battery case. However, in this way, when one of the fasteners fails, the failure risk of the seal near the failed fastener is greatly increased, which is easy to cause the seal failure of the battery case.

[0061] Based on the above considerations, in order to further improve the sealing reliability of the battery case, the embodiment of the present application proposes a battery case, the battery case 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, 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 arranged at the sealing interface to seal the first sealing surface and the second sealing surface. The first fastener is inserted 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 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 the side of the first seal away from the sealing cavity.

[0062] In the above technical solution, the first fastener and the first seal are staggered and connected via the fastening connection of the first fastener, so that the first sealing surface and the second sealing surface clamp the first seal to achieve sealing cooperation. The first seal is isolated between the sealing cavity and the first fastener, which improves the connection between the sealing cavity and the outside through the pores penetrated by the first fastener, which is beneficial to improve the sealing of the battery case. When one or a small number of the first fasteners fail, the stable connection of the battery case can still be maintained 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.

[0063] The embodiment of the present application provides an electric device using the battery disclosed in the present application as a power source, and 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 car, 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 may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric 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.

[0064] For the convenience of explanation, 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.

[0065] Please refer to Figure 1 , Figure 1The power consumption device 1000 provided for some embodiments of the present application is a structural schematic diagram of 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 be used not only 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.

[0066] Please refer to Figure 2 , Figure 2 The battery cell 110 provided in some embodiments of the present application is used in the structural explosion diagram of the battery 200. The battery 200 includes a battery case 100 and a plurality of battery cells 110, and the battery cells 110 are accommodated in the battery case 100. Among them, the battery case 100 is used to provide an assembly space for the battery cells 110, and the battery case 100 can adopt a variety of structures.

[0067] 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-shaped structure, and 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; or the first case 11 and the second case 12 may also be both hollow structures with one end open (for example, Figure 2 As shown in FIG. 1 , the open side of the first box body 11 covers the open side of the second box body 12. Of course, the battery box body 1 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid.

[0068] In the battery 200, multiple battery cells 110 can be connected in series, in parallel or in a mixed connection. A mixed connection means that multiple battery cells 110 are connected in series and in parallel. Multiple battery cells 110 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by multiple battery cells 110 is accommodated in the battery box 100; or, the battery 200 can also be a battery module formed by multiple battery cells 110 connected in series, in parallel or in a mixed connection, and multiple battery modules are then connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the battery box 100. The battery 200 may also include other structures, for example, the battery 200 may also include a busbar for realizing electrical connection between multiple battery cells 110.

[0069] Each battery cell 110 may be a secondary battery or a primary battery, or 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.

[0070] Please refer to Figure 3 , Figure 4 and Figure 7 In the embodiment of the present application, the 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 parts of the battery case 100, the second case 2 and the first case 1 are connected to each other to jointly define a sealed cavity 101 for accommodating a battery cell 110, and the first case 1 and the second case 2 jointly protect the battery cell 110 disposed in the sealed cavity 101. Among them, the first case 1 includes a first sealing surface 10, and the second case 2 includes a second sealing surface 20, and the first sealing surface 10 and the second sealing surface 20 cooperate with each other to form a sealing interface.

[0071] The battery case 100 further includes a first seal 3, which is disposed at a sealing interface, that is, the first seal 3 is disposed between the first sealing surface 10 and the second sealing surface 20. The sealing performance of the battery case 100 is improved by providing the first seal 3 between the first sealing surface 10 and the second sealing surface 20 for sealing cooperation. The first seal 3 may be a component having sealing properties and disposed between the first sealing surface 10 and the second sealing surface 20.

[0072] The battery case 100 further includes a first fastener 4, which is disposed through the first sealing surface 10 and the second sealing surface 20 to connect the two, thereby fixing the first case 1 and the second case 2. The first fastener 4 is disposed through the first sealing surface 10 and the second sealing surface 20 and clamps the first sealing member 3, so that the first sealing surface 10 and the second sealing surface 20 are sealed and connected, thereby improving the sealing performance of the battery case 100.

[0073] 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 box 100 through the first fastener 4, which is beneficial to improving the sealing of the battery box 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.

[0074] It is worth noting that the sealing interface is arranged to surround the sealing cavity 101 at least along a portion of the sealing cavity 101, and the sealing interface is 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 above-mentioned sealing interface, and the first fastener 4 is arranged away from the sealing cavity 101 relative to the first sealing member 3. For example, Figure 7 The sealing interface extending in the vertical direction is shown as an example for explanation. 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 arranged from bottom to top, and the first fastener 4 is located below the first sealing member 3.

[0075] The first fastener 4 and the first seal 3 of the embodiment of the present application are staggered. Compared with the design method of inserting the fastener through the seal to seal and tighten at the same time, the present application inserts the first fastener 4 and the first seal 3 in a staggered manner, and the first fastener 4 does not need to be inserted through the first seal 3. Therefore, it is not necessary to set a hole for the first fastener 4 to be installed at the first seal 3 and the first sealing surface 10 and the second sealing surface 20 of the sandwiched first seal, which effectively improves the problem of sealing failure caused by loosening or failure of individual first fasteners 4, which causes the inside and outside to be connected through pores, and improves the sealing stability between the first box 1 and the second box 2. In addition, the present application does not need to set a hole for the first fastener 4 to pass through at the first seal 3 and the first sealing surface 10 and the second sealing surface 20 of the sandwiched first seal, which improves the problem that the pores are easy to cause the sealing failure of the battery box 100 due to the failure of individual first fasteners 4, and it is not necessary to densely distribute the first fasteners 4 to increase the tightening force in order to reduce the influence 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, and there is no need 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.

[0076] When all the first fasteners 4 work 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 in connection. Moreover, 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.

[0077] When one or a few of the first fasteners 4 fail, the remaining first fasteners 4 still work normally and can fix the first box 1 and the second box 2 together. Since the connecting part and the sealing part are separated, the first fasteners 4 and the first seal 3 are staggered. When only one or a few of the first fasteners 4 fail, the remaining first fasteners 4 work normally, and the fastening force on the first sealing surface 10 and the second sealing surface 20 of the first seal 3 will not be lost too much. The first fasteners 4 that work normally can still make the first sealing surface 10 and the second sealing surface seal stably, thereby improving the sealing reliability of the battery box 100. In addition, since the first fasteners 4 are not fixed on the first seal 3, when the first fasteners 4 fail, no pores connecting the inside and the outside will be generated on the first seal 3, which effectively improves the problem of sealing failure caused by pores when individual first fasteners 4 fail, and further improves the sealing reliability.

[0078] In the above technical solution, the first fastener 4 and the first seal 3 are staggered and connected via the fastening connection of the first fastener 4, so that the first sealing surface 10 and the second sealing surface 20 clamp the first seal 3 to achieve sealing cooperation. The first seal 3 is isolated between the sealing cavity 101 and the first fastener 4, improving the connection between the sealing cavity 101 and the outside through the pores penetrated by the first fastener 4, which is conducive 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 the present application.

[0079] Please refer to Figure 3 and Figure 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.

[0080] At least part of the first matching portion 1a and the first connecting portion 1b together form a first sealing surface 10, and at least part of the second matching portion 2a and the second connecting portion 2b together form a second sealing surface 20. The first sealing member 3 is disposed 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 to penetrate the first sealing surface 10 and the second sealing surface 20, so that the first matching portion 1a and the second matching portion 2a clamp the first sealing member 3.

[0081] 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.

[0082] In the above technical scheme, the first matching part 1a and the second matching part 2a are used for sealing matching, and the first fastener 4 connects the first connecting part 1b and the second connecting part 2b. The first matching part 1a, the second matching part 2a, the first connecting part 1b and the second connecting part 2b have clear division of labor and clear structure, which is conducive to saving the manufacturing cost of the battery box 100.

[0083] Please refer to Figure 3 and Figure 4 In some embodiments of the present application, the second connecting portion 2b is provided with a plurality of spaced connecting holes 2b1, 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, at least one lifting hole 2b2 is located between two adjacent connecting holes, and 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 hole 2b2.

[0084] The first fastener 4 is provided with a connection hole 2b1 and is fastened to the first connection part 1b. A plurality of connection holes 2b1 arranged at intervals are provided on the second connection part 2b. Correspondingly, the first fastener 4 is also provided in a plurality of ways corresponding to the connection holes 2b1. By arranging a plurality of first fasteners 4 at intervals to fasten the first connection part 1b and the second connection part 2b, the force of the first connection part 1b and the second connection part 2b can be uniformly applied, so that the first sealing surface 10 and the second sealing surface 20 can be firmly clamped to the first sealing member 3, thereby improving the sealing reliability of the battery case 100. Even if one of the first fasteners 4 or a small number of the first fasteners 4 fails, the stable connection of the battery case 100 and the sealing of the battery case 100 can still be maintained, thereby 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 the present application.

[0085] The second connection portion 2b is also provided with a lifting hole 2b2, which is used to cooperate with a lifting tool to lock the lifting tool with the battery box 100. The lifting tool is used to move the battery box 100 to facilitate the transportation and displacement of the battery box 100. By providing an avoidance notch 1b1 on the first connection portion 1b, please refer to Figure 8 The avoidance gap 1b1 and the avoidance lifting opening 2b2 are set to improve the interference caused by the cooperation between the first box body 1 and the lifting device and the lifting hole 2b2, thereby improving the stability of the lifting operation.

[0086] 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 for clamping 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, thereby improving the sealing reliability of the battery case 100 and improving the working safety of the battery using the battery case 100 of the present application.

[0087] In the above technical scheme, 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, thereby reducing 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 the present application.

[0088] Please refer to Figure 3 In some embodiments of the present application, there are multiple hoisting holes 2b2 and they are spaced apart along the second connecting portion 2b. When performing hoisting operations, the battery box 100 is evenly stressed, which can improve the safety of the battery box 100.

[0089] In some embodiments, reference Figure 5 As shown, 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.

[0090] Please refer to Figure 4 and Fig.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.

[0091] Correspondingly, please refer to Figure 4 The first connection part 1b also has two and is arranged opposite to each other along the first direction X. The first fastener 4 is passed through the first connection part 1b and the second connection part 2b so that the first matching part 1a and the second matching part 2a clamp the first sealing member 3. The second connection part 2b is arranged on the side of the carrier plate 21 to facilitate the connection between the second connection part 2b and the first connection part 1b, thereby improving the assembly efficiency of the battery box 100.

[0092] It is worth noting that the carrier plate 21 is not a straight plate, but a plate-like member having certain structural features in the thickness direction, and the second connecting portion 2b is provided at least on the side of the carrier plate 21 perpendicular to the first direction X. The length direction of the carrier plate 21 extends along the second direction Y, the width direction of the carrier plate 21 is the first direction X, and the second connecting portions 2b are provided on both sides of the first direction X respectively.

[0093] The two second connection parts 2b are arranged at intervals along the first direction X, the length direction of the second connection part 2b extends along the second direction Y, the width direction of the second connection part 2b extends along the third direction Z, and the first direction X, the second direction Y and the third direction Z are orthogonal to each other.

[0094] 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.

[0095] In the above technical solution, by disposing the second connection portion 2 b on the side of the carrier plate 21 , the connection between the second connection portion 2 b and the first connection portion 1 b is facilitated, thereby improving the assembly efficiency of the battery box 100 .

[0096] Please refer to Figure 4 and Fig.10 In some embodiments of the present application, both 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.

[0097] For example, please refer to Figure 7 and Fig.10As shown, both sides of the bearing plate 21 in the first direction are formed into a U-shaped structure with cavities 211, that is, cavities 211 are formed inside the second connecting portion 2b. When the first fastener 4 passes through the connecting hole 2b1, a part of the first fastener 4 extends into the cavity 211, and the first fastener 4 passes through the second connecting portion 2b and is fixedly connected to the first connecting portion 2b. By providing the cavities 211, it is convenient for the first fastener 4 to pass through, and the connection stability between the first box body 1 and the second box body can be improved.

[0098] Please refer to Figure 3 、 Figure 5 and Figure 7 As shown, in some embodiments of the present application, the first fastener 4 is a blind rivet nut 40.

[0099] In the above technical solution, the first connecting portion 1b and the second connecting portion 3b are fixedly connected by the blind rivet nut 40. Compared with ordinary bolt connections, the installation hole of the blind rivet nut 40 does not need to be tapped for internal threads, nor does it need to weld nuts, which is convenient to use and can improve the installation efficiency. And the riveting of the blind rivet nut 40 is firm and the connection stability is strong.

[0100] In some embodiments of the present application, please refer to Figure 7 As shown, a part of the blind rivet nut 40 extends into the cavity 211 inside the second connecting portion 2b. The blind rivet nut 40 clamps the first connecting portion 1b and the second connecting portion 2b to fixedly connect the first box body 1 and the second box body, and the first matching portion 1a and the second matching portion 1b clamp the first seal 3 to seal and protect the sealing cavity 101.

[0101] Please refer to Figure 4 and Fig.10 , in some embodiments of the present application, the second box body 2 further includes two extension plates 22. The two extension plates 22 are arranged opposite to each other in the first direction X and are both connected to the bearing plate 21. The second matching portions 2a are two and are respectively formed on the two extension plates 22.

[0102] Correspondingly, please refer to Figure 4 , the first matching portions 1a are also two and are arranged opposite to each other in the first direction X. The first matching portions 1a and the second matching portions 2a are arranged opposite to each other to clamp the first seal 3.

[0103] The second matching portion 2a is arranged adjacent to the second connecting portion 2b. After the first fastener 4 fixedly 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 seal 3 to seal and protect the sealing cavity 101.

[0104] 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.

[0105] Please refer to Figure 7 In some embodiments of the application, the first fastener 4 is also provided through the extension plate 22 to connect the first connection portion 1b, the second connection portion 2b and the extension plate 22. Fig.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 fix the extension plate 22. Compared with connecting the extension plate 22 to the carrier plate 21 by bonding and welding, directly using the first fastener 4 connecting the carrier plate 21 and the first connecting portion 1b to fix the extension plate 22 to the carrier plate 21 can reduce the assembly steps of the battery box 100, reduce the manufacturing cost, and improve the assembly efficiency.

[0106] 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.

[0107] 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, 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, the surface of the top plate 11 facing the extension wall is a fourth sealing surface 111, and a second sealing member 6 is sandwiched between the third sealing surface 231 and the fourth sealing surface 111.

[0108] 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.

[0109] 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 .

[0110] In some embodiments of the present application, the battery case 100 also 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 sealing cavity 101.

[0111] 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 .

[0112] In the above technical solution, the fourth sealing member 111 and the third sealing member 231 are fixedly connected by the second fastener 5 through the second sealing member 6, and the fourth sealing surface 11 and the third sealing surface 231 are sealed and matched, which can save the layout area of ​​the second sealing member 6 and the second fastener 5 staggered, and can reduce the space occupied by the battery box 100, which is conducive to the miniaturization design of the battery box 100. In addition, the second fastener 5 is completely located outside the sealed cavity 101, and the sealed cavity 101 will not be connected to the outside of the battery box 100 through the penetration of the second fastener 5, which is conducive to improving the sealing of the battery box 100.

[0113] Please refer to Figure 4 The second box body 2 includes a supporting plate 21 and two extending walls 23 arranged oppositely along the second direction Y. Correspondingly, the first box body 1 includes a top plate 11, and the top plate 11 includes a first plate portion 112 and two second plate portions 113 arranged oppositely along the first direction X.

[0114] The second plate portion 113 is formed with a first sealing surface 10 at one end away from the first plate portion 112, and both the first matching portion 1a and the second connecting portion 1b are two and extend along the second direction Y. The two sides of the first direction X of the carrier plate 21 are configured as second connecting portions 2b, and the number of the second connecting portions 2b is two and extends along the second direction Y. The extension plate 22 is connected to the carrier plate 21, and the extension plate 22 is formed with a second matching portion 2a, and the number of the second matching portion 2b is two and extends along the second direction X.

[0115] The first connection portion 1b and the second connection portion 2b are fixedly connected by a first fastener 4, and a first sealing member 3 is sandwiched between the first matching portion 2a and the second matching portion 2b to seal and match two pairs of edges of the first box body 1 and the second box body 2 extending along the second direction Y.

[0116] 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, and not directly connected to the carrier plate 21 can be understood as being set away from the carrier plate 21.

[0117] 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.

[0118] A second sealing member 6 is sandwiched between the third sealing surface 231 and the fourth sealing surface 111, and a 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, so as 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.

[0119] In some embodiments of the present application, the first seal 3 and the second seal 6 are integrally formed into a ring shape, and the first seal 3 and the second seal 6 have strong integrity, which can improve the sealing effect on the sealed cavity 101. Compared with the first seal 3 and the second seal 6 being connected separately, 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 can be improved, which is conducive to improving the sealing of the battery box 100.

[0120] 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.

[0121] In some embodiments of the present application, the extension wall 22 is fully welded to the supporting plate 21 .

[0122] 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 improve the working safety of the battery box body.

[0123] In a second aspect, an embodiment of the present application provides a battery 200 , including a battery cell 110 and the above-mentioned battery case 100100 , wherein the battery cell 110 is accommodated in a sealed cavity 101 .

[0124] 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.

[0125] In a third aspect, an embodiment of the present application provides an electrical device 1000, comprising the above-mentioned battery 200, and the battery 200 is used to provide electrical energy.

[0126] 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.

[0127] Please refer again Figure 3-Figure 10 , describing the battery case 100 of a specific embodiment of the present application.

[0128] In the embodiment of the present application, the battery box 100 includes: a first box 1, a second box 2, a first sealing member 3 and a first fastener 4. The battery box 100 is a rectangular parallelepiped, the first box 1 is located above the second box 2, the first box 1 includes a first plate portion 112 located above and extending in the horizontal direction, the first box 1 also includes two second plates 113 spaced apart in the front-to-back direction, the length of the second plate portion 113 extends in the left-right direction, and the first plate portion 112 and the second plate portion 113 are connected by bending.

[0129] The second box body 2 includes a support plate 21 located below and extending in the horizontal direction. The second box body 2 also includes two extension walls 23 spaced apart in the left-right direction. The length of the extension wall 23 extends in the front-back direction. The support plate 21 and the extension wall 23 are connected by bending.

[0130] 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 of the first box body 1 and the second box body 2 extending in the left and right directions.

[0131] The fourth sealing surface 111 is provided at the left and right ends of the first plate portion 112, and four fourth sealing surfaces extending in the up-down direction are also provided on the second plate portion 113; the third sealing panel 231 is 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 up-down direction. A second sealing member 6 is sandwiched between the third sealing surface 231 and the fourth sealing surface 111, and 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, so as to seal and match the two pairs of edges extending in the front-back direction of the first box body 1 and the second box body 2, and seal and match the two pairs of edges extending in the up-down direction of the first box body 1 and the second box body 2.

[0132] A hoisting hole 2b2 is also provided at the second connection portion 3b, and the hoisting hole 2b2 is separated from the first mating portion 1a and the second mating portion 2a for sealing, which can reduce the risk of sealing failure of the battery case 100 caused by deformation of the hoisting hole 2b2 during the hoisting process of the battery case 100, improve the sealing reliability of the battery case 100, and improve the working safety of the battery using the battery case 100 of the present application. When a certain first fastener 4 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 can be maintained, reducing the risk of sealing failure of the battery case 100 after the failure of the first fastener 4, and improving the working safety of the battery using the battery case 100 of the present application.

[0133] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0134] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery box, characterized in that: 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 box according to claim 1, characterized in that: 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 box according to claim 2, characterized in that: 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, characterized in that: 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 box according to claim 4, characterized in that: 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 box according to claim 5, characterized in that: 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 box according to claim 5, characterized in that: 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, characterized in that: 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, characterized in that: The first sealing member and the second sealing member are integrally formed in a ring shape.

10. The battery case according to claim 7, characterized in that: The extension wall is fully welded to the bearing plate.

11. A battery, characterized in that: 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, characterized in that: A battery according to claim 11, for providing electrical energy.

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