Box body, battery, power utilization device and assembly method of box body

Abstract

The embodiment of the invention provides a box body, a battery, a power utilization device and an assembling method of the box body. The box body comprises a frame (20); the end plate (10) is connected to the frame (20), and the end plate (10) comprises a first connecting part (11) and a second connecting part (21) which face the frame (20); the circumferential edge of the first connecting part (11) and the circumferential edge of the second connecting part (21) are connected with the frame (20); wherein the whole circumferential edge of at least one of the first connecting part (11) and the second connecting part (21) is continuously and hermetically connected with the frame (20). The end plate (10) and the frame (20) are connected through the first connecting part (11) and the second connecting part (21) in a double-connection fastening mode, the structure is simple, installation is convenient, the assembling efficiency is high, cost is low, and reliability is good.

Description

Box, battery, electrical device and box assembly method Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a box, a battery, an electrical device, and a method for assembling the box. Background Art

[0002] In some related technologies, a battery includes a housing and battery cells. The battery cells are placed in the housing. The housing has many components and a complex structure.

[0003] Summary of the Invention

[0004] Some embodiments of the present application provide a box, a battery, an electrical device, and a box assembly method to alleviate the problem of complex box structure.

[0005] Some embodiments of the present application also provide a box body, which includes: a frame; and an end plate connected to the frame, the end plate including a first connecting portion and a second connecting portion facing the frame; the circumferential edge of the first connecting portion and the circumferential edge of the second connecting portion are both connected to the frame; wherein the entire circumferential edge of at least one of the first connecting portion and the second connecting portion is continuously sealed and connected to the frame.

[0006] In the above embodiment, the entire circumferential edge of at least one of the first connecting part and the second connecting part is continuously sealed and connected to the frame, which is used to achieve sealing at the connection between the end plate and the frame. It has a simple structure, easy installation, high assembly efficiency, low cost and good reliability.

[0007] In some embodiments, the first connection portion and the second connection portion are not on the same plane.

[0008] In the above embodiment, the first connection portion and the second connection portion are not on the same plane, and when one of the first connection portion and the second connection portion is connected, the other of the first connection portion and the second connection portion will not be affected.

[0009] In some embodiments, the first connection portion is closer to the inner space of the box than the second connection portion.

[0010] In the above embodiment, the first connection portion is closer to the inner space of the box than the second connection portion. When one of the first connection portion and the second connection portion is connected, the other one of the first connection portion and the second connection portion is not affected.

[0011] In some embodiments, the entire circumferential edge of the first connecting portion is continuously and sealedly connected to the frame, and the circumferential edge of the second connecting portion is connected to the frame through at least two connecting members.

[0012] In the above embodiment, the entire circumferential edge of the first connecting portion is continuously sealed to the frame, thereby achieving a seal at the connection between the end plate and the frame. The circumferential edge of the second connecting portion is connected to the frame via at least two connecting members, thereby enhancing the connection strength between the end plate and the frame. This results in a simple structure with a small number of components for the end plate, making the connection between the end plate and the frame easy to operate, low in cost, and highly reliable.

[0013] In some embodiments, the entire circumferential edge of at least one of the first connecting portion and the second connecting portion is continuously sealed to the frame by friction stir welding.

[0014] In the above embodiment, friction stir welding is used to form a continuous sealed connection, which is easy to operate, conducive to mechanization and automation, simple in equipment, and low in cost.

[0015] In some embodiments, the entire circumferential edge of one of the first connecting portion and the second connecting portion is continuously and sealedly connected to the frame, and the circumferential edge of the other one is connected to the frame via at least two connecting members.

[0016] In the above embodiment, the entire circumferential edge of one of the first and second connecting portions is continuously sealed to the frame, thereby achieving a seal at the connection between the end plate and the frame. The circumferential edge of the other of the first and second connecting portions is connected to the frame via at least two connecting members, thereby enhancing the connection strength between the end plate and the frame. The end plate has a small number of parts and a simple structure, making the connection between the end plate and the frame easy, low-cost, and highly reliable.

[0017] In some embodiments, the connector comprises a heat-melt self-tapping screw.

[0018] In the above embodiment, the frame is connected by at least two hot-melt self-tapping screws, and no pre-drilling is required, which is convenient to operate and low in cost.

[0019] In some embodiments, the end plate includes a first plate and a second plate stacked along a first direction; the first connecting portion is located on the first plate, and the second connecting portion is located on the second plate.

[0020] In the above embodiment, the entire circumferential edge of at least one of the first and second connecting portions is continuously sealed to the frame, thereby achieving a seal at the connection between the end plate and the frame. The end plate has a small number of parts and a simple structure, making the connection between the end plate and the frame easy to operate, low in cost, and highly reliable.

[0021] In some embodiments, the end plate further includes a middle piece disposed between the first plate and the second plate, wherein the middle piece connects the first plate and the second plate and forms a space between the first plate and the second plate.

[0022] In the above embodiment, an intermediate piece is provided between the first plate and the second plate. The intermediate piece forms a gap between the first plate and the second plate, which can provide a buffering effect for the end plate and improve the ability of the end plate to withstand impact.

[0023] In some embodiments, the intermediate member is configured as a honeycomb structure.

[0024] In the above embodiment, a middle piece with a honeycomb structure is provided between the first plate and the second plate, which can provide a better buffering effect for the end plate and improve the ability of the end plate to withstand impact.

[0025] In some embodiments, the intermediate piece forms at least one flow channel between the first plate and the second plate, and an extending direction of the flow channel intersects with the first direction.

[0026] In the above embodiment, the intermediate piece forms at least one flow channel between the first plate and the second plate, which can not only transport coolant through the flow channel to reduce the temperature of the end plate and other components abutting the end plate, but also provide a buffering effect through the intermediate piece to improve the end plate's ability to withstand impact.

[0027] In some embodiments, the intermediate piece includes a first component and a second component, wherein the first component is constructed as a honeycomb structure, and the second component forms at least one flow channel between the first component and the first plate or the second plate; the extension direction of the flow channel intersects with the first direction.

[0028] In the above embodiment, the intermediate member includes a first component and a second component. The first component is constructed as a honeycomb structure, providing a cushioning effect and improving the end plate's ability to withstand impact. The second component forms at least one flow channel between the first and second plates. This flow channel can not only transport coolant to reduce the temperature of the end plate and other components abutting the end plate, but also provide a cushioning effect, improving the end plate's ability to withstand impact.

[0029] In some embodiments, the projection range of the second connecting portion in the first direction covers and exceeds the projection range of the first connecting portion in the first direction; the frame is arranged on a side of the second plate adjacent to the first plate, and the frame is arranged around the circumferential outer edge of the first plate.

[0030] In the above embodiment, the frame is provided on a side of the second plate adjacent to the first plate, the second plate covers the frame, and the frame is provided around the circumferential outer edge of the first plate. The projection range of the second connection portion in the first direction covers and exceeds the projection range of the first connection portion in the first direction, and is used to realize a continuous sealed connection between the first connection portion at the circumferential edge of the first plate and the frame, enabling the frame to form a sealed connection with the end plate, so that the cavity enclosed by the frame is sealed at the end plate; at least two connecting members spaced apart at the circumferential edge of the second plate are connected to the frame, so as to improve the connection strength between the end plate and the frame.

[0031] In some embodiments, the projection range of the first connecting portion in the first direction covers and exceeds the projection range of the middle piece in the first direction; the frame includes a first extension portion extending between the first plate and the second plate, and the first extension portion forms a continuous sealed connection with the first connecting portion.

[0032] In the above embodiment, the projection of the first connecting portion in the first direction covers and exceeds the projection of the intermediate member in the first direction, so that the first plate, the intermediate member, and the second plate can be assembled first, and then the first extension of the frame can be inserted between the first and second plates to achieve a continuous sealed connection between the first plate and the frame from the side of the first plate facing away from the second plate. The first extension serves to connect the frame to the end plate and also provides support for welding the first plate.

[0033] In some embodiments, a side of the first extension portion facing away from the second plate forms a continuous sealed connection with the first connecting portion.

[0034] In the above embodiment, the first extension portion of the frame is inserted between the first plate and the second plate, and the side of the first extension portion facing away from the second plate abuts against the first connection portion to form a continuous sealed connection, thereby achieving a continuous sealed connection between the first plate and the frame.

[0035] In some embodiments, the frame further includes a first limiting portion, which is provided on a side of the first extension portion facing away from the second plate, and the first limiting portion abuts against a circumferential outer edge of the first plate.

[0036] In the above embodiment, the first limiting portion abuts against the circumferential outer edge of the first plate, can position the first plate, and is used to achieve a continuous sealed connection between the first plate, the first limiting portion, and the first extending portion.

[0037] In some embodiments, a side of the first limiting portion facing away from the second plate is flush with a side of the first plate facing away from the second plate.

[0038] In the above embodiment, the side of the first limiting portion facing away from the second plate is flush with the side of the first plate facing away from the second plate, thereby forming a flat bottom structure in the box.

[0039] In some embodiments, the projection range of the middle piece in the first direction covers and exceeds the projection range of the first connecting portion in the first direction; the frame includes a second extension portion, which is located on the side of the first plate away from the second plate, and the second extension portion forms a continuous sealed connection with the first connecting portion.

[0040] In the above embodiment, the projection of the intermediate member in the first direction overlaps and exceeds the projection of the first connecting portion in the first direction, enabling a continuous, sealed connection between the first plate and the frame from the side of the first plate closest to the second plate, before the intermediate member and the second plate are assembled. The first plate is supported by the second extension, and the first connecting portion is continuously and sealedly connected to the second extension of the frame before the second plate is assembled. The second extension serves both to connect the frame to the end plate and to support welding of the first plate.

[0041] In some embodiments, the second extension portion forms a continuous sealed connection with the first connection portion adjacent to a side of the second plate.

[0042] In the above embodiment, the second extension portion is located on the side of the first plate facing away from the second plate, and the second extension portion is adjacent to the side of the second plate and abuts against the first connection portion, forming a continuous sealed connection with the first connection portion, thereby realizing a continuous sealed connection between the first plate and the frame.

[0043] In some embodiments, the frame further includes a second limiting portion, which is provided on a side of the second extending portion adjacent to the second plate, and the second limiting portion abuts against a circumferential outer edge of the first plate.

[0044] In the above embodiment, the second limiting portion abuts against the circumferential outer edge of the first plate, can position the first plate, and is used to achieve a continuous sealed connection between the first plate, the second limiting portion, and the second extending portion.

[0045] In some embodiments, a side of the second limiting portion adjacent to the second plate is flush with a side of the first plate adjacent to the second plate.

[0046] In the above embodiment, the second limiting portion is used to limit the first plate.

[0047] Some embodiments of the present application further provide a battery, which includes the box provided by any of the above embodiments.

[0048] In the above embodiments, the battery includes the box body in any of the above embodiments, and accordingly has the beneficial effects of the box body.

[0049] Some embodiments of the present application further provide an electrical device comprising the battery provided by any of the above embodiments.

[0050] In the above embodiments, the electrical device includes the battery in any of the above embodiments, and accordingly has the beneficial effects of the battery.

[0051] Some embodiments of the present application further provide a method for assembling a box, which includes the following steps:

[0052] Provide a border; and

[0053] Providing an end plate, the end plate comprising a first connecting portion and a second connecting portion facing the frame;

[0054] The circumferential edge of the first connecting portion and the circumferential edge of the second connecting portion are both connected to the frame; wherein the entire circumferential edge of at least one of the first connecting portion and the second connecting portion is continuously and sealedly connected to the frame.

[0055] In the above embodiment, the entire circumferential edge of at least one of the first connecting part and the second connecting part is continuously sealed and connected to the frame, which is used to achieve sealing at the connection between the end plate and the frame. It has a simple structure, easy installation, high assembly efficiency, low cost and good reliability.

[0056] In some embodiments, the first connection portion is closer to the interior space of the box than the second connection portion;

[0057] The method of continuously sealingly connecting the entire circumferential edge of at least one of the first connecting part and the second connecting part to the frame includes: continuously sealingly connecting the entire circumferential edge of the first connecting part to the frame, and connecting the circumferential edge of the second connecting part to the frame through at least two connecting parts.

[0058] In the above embodiment, the first connecting portion forms a continuous, sealed connection with the frame, thereby achieving a seal at the connection between the end plate and the frame. The second connecting portion is connected to the frame via at least two connecting members, thereby enhancing the connection strength between the end plate and the frame. The end plate has a small number of components and a simple structure, making the connection between the end plate and the frame easy to operate, low in cost, and highly reliable.

[0059] In some embodiments, the end plate includes a first plate and a second plate stacked along a first direction; the first connecting portion is located on the first plate, and the second connecting portion is located on the second plate;

[0060] Before connecting the circumferential edge of the first connecting portion and the circumferential edge of the second connecting portion to the frame, the assembly method further includes:

[0061] The frame is placed on a side of the second plate adjacent to the first plate, the frame is arranged around the circumferential outer edge of the first plate, and the first extension portion on the frame extends between the first plate and the second plate;

[0062] The step of continuously sealingly connecting the entire circumferential edge of at least one of the first connecting portion and the second connecting portion to the frame comprises:

[0063] forming a continuous sealed connection between the entire circumferential edge of the first connecting portion and the first extending portion; and

[0064] The peripheral edge of the second connecting portion is connected to the frame through at least two connecting members.

[0065] In the above embodiment, the end plate is first manufactured and then connected to the frame. The connection between the end plate and the frame is divided into an upper connection and a lower connection. The upper part of the end plate adopts a continuous sealing connection to connect the first plate to the frame, and the lower part of the end plate connects the second plate to the frame through a connecting piece; the upper and lower double connection fastening method has a simple structure, easy installation, high assembly efficiency, low cost and good reliability.

[0066] In some embodiments, the end plate includes a first plate and a second plate stacked along a first direction; the first connecting portion is located on the first plate, and the second connecting portion is located on the second plate, wherein;

[0067] Providing the frame includes: placing the frame so that the end portion of the frame connected to the end plate is located above the cavity enclosed by the frame;

[0068] The step of continuously and sealingly connecting the entire circumferential edge of at least one of the first connecting portion and the second connecting portion to the frame comprises: placing a first plate within an end portion of the frame and supporting it through a second extension portion on the frame; continuously and sealingly connecting the entire circumferential edge of the first connecting portion to the second extension portion; and

[0069] The second plate is arranged on a side of the first plate away from the frame, the second plate covers the frame, and the peripheral edge of the second connecting portion is connected to the frame through at least two connecting pieces.

[0070] In the above embodiment, the first end plate is first connected to the frame in a continuous, sealed manner, and then the second end plate is installed. Finally, the second end plate is integrally connected to the frame, forming a box structure with few parts and a simple structure. This double connection and fastening method of the upper and lower parts provides a simple structure, convenient installation, high assembly efficiency, low cost, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0072] FIG1 is a schematic structural diagram of a vehicle disclosed in some embodiments of the present application;

[0073] FIG2 is a schematic diagram of the exploded structure of a battery disclosed in some embodiments of the present application;

[0074] FIG3 is a schematic cross-sectional view of the box disclosed in the first embodiment of the present application;

[0075] FIG4 is a schematic cross-sectional view of a box body disclosed in a second embodiment of the present application;

[0076] FIG5 is a schematic cross-sectional view of a box body disclosed in a third embodiment of the present application;

[0077] FIG6 is a schematic diagram of the exploded structure of the end plate disclosed in some embodiments of the present application;

[0078] FIG7 is a schematic cross-sectional view of the end plate disclosed in the first embodiment of the present application;

[0079] FIG8 is a partial enlarged schematic diagram of FIG7;

[0080] FIG9 is a schematic diagram of a first honeycomb structure disclosed in some embodiments of the present application;

[0081] FIG10 is a schematic diagram of a second honeycomb structure disclosed in some embodiments of the present application;

[0082] FIG11 is a schematic cross-sectional view of an end plate disclosed in a second embodiment of the present application;

[0083] FIG12 is a partial enlarged schematic diagram of FIG11;

[0084] FIG13 is a schematic diagram of the exploded structure of the box disclosed in the first embodiment of the present application;

[0085] FIG14 is a schematic top view of the box disclosed in the first embodiment of the present application;

[0086] FIG15 is a bottom view of the box disclosed in the first embodiment of the present application;

[0087] FIG16 is a partial cross-sectional schematic diagram of the box disclosed in the first embodiment of the present application;

[0088] FIG17 is a schematic diagram of the exploded structure of the box disclosed in the second embodiment of the present application;

[0089] FIG18 is a schematic diagram of placing a first plate on the frame of the box disclosed in the second embodiment of the present application;

[0090] FIG19 is a partial cross-sectional view of the frame of the box body after being connected to the first plate according to the second embodiment of the present application;

[0091] FIG20 is a schematic diagram of the second embodiment of the present application, in which the frame of the box is connected to the first plate and the intermediate member and the second plate are placed thereon;

[0092] FIG21 is a schematic diagram of a box body according to a second embodiment of the present application after the frame is connected to the first plate, and the first plate is connected to the middle piece and the second plate;

[0093] FIG22 is a schematic diagram of the connection between the second plate and the frame of the box disclosed in the second embodiment of the present application;

[0094] FIG23 is a partial cross-sectional schematic diagram of the box body disclosed in the second embodiment of the present application.

[0095] In the drawings, the drawings are not drawn to scale.

[0096] Marking instructions: 10-end plate; 1-first plate; 11-first connecting part; 2-second plate; 21-second connecting part; 3-middle piece; 31-first component; 32-second component; 33-first honeycomb structure; 34-second honeycomb structure; 4-flow channel; 20-frame; 201-first extension part; 202-second extension part; 203-first limiting part; 204-second limiting part; 30-connecting part; 40-weld; 100-battery; 101-box assembly; 101a-first box; 101b-second box; 102-battery cell; 200-vehicle; 200a-axle; 200b-wheel; 200c-motor; 200d-controller. DETAILED DESCRIPTION

[0097] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0098] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0099] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0100] With the vigorous promotion of new energy vehicles, power batteries, as rechargeable batteries, are widely used as the power source for new energy vehicles. In some related technologies, the battery includes a housing and battery cells. The battery cells are housed in the housing. The housing has a large number of parts and a complex structure.

[0101] Based on this, some embodiments of the present application provide a box, a battery, an electrical device, and an assembly method for the box, so as to alleviate the problem of complex box structure.

[0102] The battery of the present application can be used in electrical devices to provide electrical energy for the electrical devices, and the electrical devices can be mobile phones, portable devices, laptop computers, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, etc. Among them, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0103] 1 , the power-consuming device of the present application may be a vehicle 200. For example, a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle.

[0104] Vehicle 200 includes an axle 200a, wheels 200b, a motor 200c, a controller 200d, and a battery 100. Wheels 200b are connected to axle 200a, motor 200c is used to drive axle 200a, and controller 200d is used to control the operation of motor 200c. Battery 100 can be located at the bottom, front, or rear of vehicle 200 to provide power to motor 200c and other components of the vehicle.

[0105] Referring to Figure 2 , battery 100 includes a housing assembly 101 and at least one battery cell 102. The at least one battery cell 102 may include two or more battery cells 102. Multiple battery cells 102 may be connected in series, in parallel, or in a hybrid configuration. The hybrid configuration refers to a combination of series and parallel connections. The housing assembly 101 is hollow, housing the at least one battery cell 102.

[0106] The box assembly 101 may include a first box 101a and a second box 101b. A plurality of battery cells 102 are connected in parallel, series, or in a hybrid combination and are placed in a closed chamber formed by the first box 101a and the second box 101b being fastened together.

[0107] At least one of the first box body 101a and the second box body 101b can adopt the box body provided in the embodiment of the present application.

[0108] 3 to 5 , some embodiments of the present application provide a box body, which includes a frame 20 and an end plate 10 .

[0109] The end plate 10 is connected to the frame 20, and the end plate 10 includes a first connecting portion 11 and a second connecting portion 21 facing the frame 20; the circumferential edge of the first connecting portion 11 and the circumferential edge of the second connecting portion 21 are both connected to the frame 20; wherein, the entire circumferential edge of at least one of the first connecting portion 11 and the second connecting portion 21 is continuously sealed and connected to the frame 20.

[0110] In the above embodiment, the entire circumferential edge of at least one of the first connection part 11 and the second connection part 21 is continuously sealed and connected to the frame 20, so as to achieve sealing at the connection between the end plate 10 and the frame 20. It has a simple structure, is easy to install, has high assembly efficiency, low cost and good reliability.

[0111] In some embodiments, the frame 20 includes circumferential sidewalls that enclose a cavity. For example, the frame 20 includes four sequentially connected sidewalls.

[0112] In some embodiments, the first connection portion 11 and the second connection portion 21 are not on the same plane.

[0113] In the above embodiment, the entire circumferential edges of the first connection part 11 and the second connection part 21 can be continuously sealed and connected to the frame 20, or one of them can be continuously sealed and connected to the frame 20. The first connection part 11 and the second connection part 21 are not on the same plane. When connecting one of the first connection part 11 and the second connection part 21, it will not affect the other one of the first connection part 11 and the second connection part 21.

[0114] In some embodiments, the first connection portion 11 is closer to the inner space of the box than the second connection portion 21 .

[0115] In the above embodiment, the entire circumferential edges of the first connection part 11 and the second connection part 21 can be continuously sealed and connected to the frame 20, or one of them can be continuously sealed and connected to the frame 20. The first connection part 11 is closer to the internal space of the box than the second connection part 21. When connecting one of the first connection part 11 and the second connection part 21, it will not affect the other one of the first connection part 11 and the second connection part 21.

[0116] In some embodiments, the entire circumferential edge of the first connection portion 11 is continuously and sealedly connected to the frame 20 , and the circumferential edge of the second connection portion 21 is connected to the frame 20 via at least two connectors 30 .

[0117] In the above embodiment, the entire circumferential edge of the first connecting portion 11 is continuously sealed to the frame 20 to achieve a seal at the connection between the end plate 10 and the frame 20. The circumferential edge of the second connecting portion 21 is connected to the frame 20 via at least two connecting members 30 to improve the connection strength between the end plate 10 and the frame 20. The end plate 10 has a small number of parts and a simple structure. The connection operation between the end plate 10 and the frame 20 is convenient, low-cost, and highly reliable.

[0118] In some embodiments, the entire circumferential edge of at least one of the first connection portion 11 and the second connection portion 21 is continuously sealed to the frame 20 by friction stir welding.

[0119] In the above embodiment, friction stir welding is used to form a continuous sealed connection, which is easy to operate, conducive to mechanization and automation, simple in equipment, and low in cost.

[0120] In the above embodiment, friction stir welding belongs to solid phase welding. Of course, continuous sealing connection is not limited to solid phase welding, and continuous sealing connection can also be formed by fusion welding or brazing.

[0121] In the above embodiment, the entire circumferential edge of the first connection portion 11 is continuously sealed to the frame 20 by friction stir welding. And / or the entire circumferential edge of the second connection portion 21 is continuously sealed to the frame 20 by friction stir welding.

[0122] In some embodiments, the entire circumferential edge of one of the first connecting portion 11 and the second connecting portion 21 is continuously sealed and connected to the frame 20 , and the circumferential edge of the other one is connected to the frame 20 via at least two connecting members 30 .

[0123] In the above embodiment, the entire circumferential edge of one of the first connecting portion 11 and the second connecting portion 21 is continuously sealed and connected to the frame 20, thereby achieving a seal at the connection between the end plate 10 and the frame 20. The circumferential edge of the other of the first connecting portion 11 and the second connecting portion 21 is connected to the frame 20 via at least two connecting members 30, thereby improving the connection strength between the end plate 10 and the frame 20. The end plate 10 has a small number of parts and a simple structure. The connection operation between the end plate 10 and the frame 20 is convenient, low-cost, and highly reliable.

[0124] In some embodiments, the connector 30 comprises a heat-melt self-tapping screw.

[0125] In the above embodiment, the circumferential edge of the other one of the first connection part 11 and the second connection part 21 is connected to the frame 20 by at least two hot-melt self-tapping screws. By being connected to the frame 20 by at least two hot-melt self-tapping screws, no pre-punching is required, the operation is convenient, and the cost is low.

[0126] In some embodiments, the connecting member 30 includes a bolt, a screw, a connecting pin, or the like.

[0127] 6 to 8 , in some embodiments, the end plate 10 includes a first plate 1 and a second plate 2 stacked along a first direction X; the first connection portion 11 is located on the first plate 1 , and the second connection portion 21 is located on the second plate 2 .

[0128] In the above embodiment, the first direction X is parallel to the direction from the first plate 1 to the second plate 2 .

[0129] In the above embodiment, the end plate 10 includes a first plate 1 and a second plate 2 stacked along a first direction X; the first connecting portion 11 is located on the first plate 1, and the second connecting portion 21 is located on the second plate 2. The entire circumferential edge of at least one of the first connecting portion 11 and the second connecting portion 21 is continuously and hermetically connected to the frame 20, thereby achieving a seal at the connection between the end plate 10 and the frame 20. The end plate 10 has a small number of parts and a simple structure. The connection between the end plate 10 and the frame 20 is easy to operate, low in cost, and highly reliable.

[0130] In some embodiments, the first plate 1 comprises an aluminum plate.

[0131] In some embodiments, the second plate 2 includes a steel plate or an aluminum plate.

[0132] In some embodiments, the first connection portion 11 is provided in a closed loop along the circumferential edge of the first plate 1 and forms a continuous sealed connection with the frame 20. The second connection portion 21 is connected to the frame 20 via at least two connectors 30.

[0133] In the above embodiment, the end plate 10 includes a first plate 1 and a second plate 2 stacked together. The first connecting portion 11 of the first plate 1 forms a continuous, sealed connection with the frame 20, thereby achieving a seal at the connection between the end plate 10 and the frame 20. The second connecting portion 21 of the second plate 2 is connected to the frame 20 via at least two connecting members 30, thereby enhancing the connection strength between the end plate 10 and the frame 20. The end plate 10 has a small number of components and a simple structure. The connection between the end plate 10 and the frame 20 is easy to operate, low in cost, and highly reliable.

[0134] In some embodiments, the first connection portion 11 and the frame 20 are continuously sealed together by friction stir welding (FSW).

[0135] In the above embodiment, the first connection portion 11 and the frame 20 are connected by stir friction welding, which is easy to operate, conducive to mechanization and automation, simple in equipment, and low in cost.

[0136] In some embodiments, the box further includes a connector 30 , and the connector 30 includes a hot-melt self-tapping screw FDS.

[0137] In the above embodiment, the second connection portion 21 is connected to the frame 20 by hot-melt self-tapping screws, which does not require pre-drilling, is easy to operate, and has low cost.

[0138] 3 and 4 , in some embodiments, the end plate 10 further includes a middle piece 3 disposed between the first plate 1 and the second plate 2 . The middle piece 3 connects the first plate 1 and the second plate 2 and forms a gap between the first plate 1 and the second plate 2 .

[0139] In the above embodiment, an intermediate member 3 is provided between the first plate 1 and the second plate 2. The intermediate member 3 forms a gap between the first plate 1 and the second plate 2, which can provide a buffering effect for the end plate 10 and improve the ability of the end plate 10 to withstand impact.

[0140] In some embodiments, the intermediate member 3 is constructed as a honeycomb structure.

[0141] In the above embodiment, the middle piece 3 with a honeycomb structure is provided between the first plate 1 and the second plate 2, which can provide a better buffering effect for the end plate 10 and improve the ability of the end plate 10 to withstand impact.

[0142] In some embodiments, the material of the middle piece 3 includes plastic, such as PP (polypropylene), or the material of the middle piece 3 includes aluminum.

[0143] In some embodiments, the middle piece 3 is made of PP material and has a honeycomb structure. The first plate 1, the second plate 2, and the middle piece 3 located between the first plate 1 and the second plate 2 are integrated into an end plate 10 with a three-layer structure by hot melting.

[0144] In some embodiments, the middle piece 3 is made of aluminum and has a honeycomb structure. The first plate 1 , the second plate 2 , and the middle piece 3 located between the first plate 1 and the second plate 2 are integrated into an end plate 10 having a three-layer structure by brazing with aluminum alloy.

[0145] In some embodiments, the first plate 1 is an aluminum plate, the second plate 2 is a steel plate, and the middle piece 3 is a PP honeycomb structure. The aluminum plate, the PP honeycomb structure and the steel plate are pressed into a whole to form an end plate 10.

[0146] 5 , in some embodiments, the intermediate member 3 forms at least one flow channel 4 between the first plate 1 and the second plate 2 , and an extending direction of the flow channel 4 intersects with the first direction X.

[0147] In the above embodiment, the intermediate member 3 forms at least one flow channel 4 between the first plate 1 and the second plate 2, which can not only transport coolant through the flow channel 4 to reduce the temperature of the end plate 10 and other components abutting the end plate 10, but also provide a buffering effect through the intermediate member 3 to improve the ability of the end plate 10 to withstand impact.

[0148] In some embodiments, the extension direction of the flow channel 4 is perpendicular to the first direction X.

[0149] The first direction X is parallel to the direction from the first plate 1 to the second plate 2. The first direction X is perpendicular to the second direction Y and the third direction Z, respectively. The second direction Y is perpendicular to the third direction Z.

[0150] In some embodiments, referring to Figure 5, the middle piece 3 includes a first component 31 and a second component 32, wherein the first component 31 is constructed as a honeycomb structure, and the second component 32 forms at least one flow channel 4 between the first component 31 and the first plate 1 or the second plate 2; the extension direction of the flow channel 4 intersects with the first direction X.

[0151] In the above embodiment, the intermediate member 3 includes a first component 31 and a second component 32. The first component 31 is constructed as a honeycomb structure, which provides a cushioning effect and improves the end plate 10's ability to withstand impact. The second component 32 forms at least one flow channel 4 between the first plate 1 and the second plate 2. This flow channel 4 can not only transport coolant to reduce the temperature of the end plate 10 and other components abutting the end plate 10, but also provide a cushioning effect through the second component 32, improving the end plate 10's ability to withstand impact.

[0152] 9 , in some embodiments, the honeycomb structure includes a first honeycomb structure 33 , and the first honeycomb structure 33 is a hexagonal honeycomb structure.

[0153] 10 , in some embodiments, the honeycomb structure further includes a second honeycomb structure 34 , and the second honeycomb structure 34 is a circular honeycomb structure.

[0154] Of course, the honeycomb structure is not limited to the hexagonal honeycomb structure and the circular honeycomb structure.

[0155] Referring to Figures 7, 8, 11 and 12, in some embodiments, the projection range of the second connection portion 21 in the first direction X covers and exceeds the projection range of the first connection portion 11 in the first direction X; referring to Figures 3 to 5, the frame 20 is arranged on the side of the second plate 2 adjacent to the first plate 1, and the frame 20 is arranged around the circumferential outer edge of the first plate 1.

[0156] In the above embodiment, the frame 20 is arranged on the side of the second plate 2 adjacent to the first plate 1, the second plate 2 covers the frame 20, and the frame 20 is arranged around the circumferential outer edge of the first plate 1. The projection range of the second connection part 21 in the first direction X covers and exceeds the projection range of the first connection part 11 in the first direction X, which is used to realize the first connection part 11 on the circumferential edge of the first plate 1 to form a continuous sealed connection with the frame 20, so that the frame 20 can form a sealed connection with the end plate 10, so that the cavity enclosed by the frame 20 is sealed at the end plate 10; at least two connecting members 30 spaced apart on the circumferential edge of the second plate 2 are connected to the frame 20, so as to improve the connection strength between the end plate 10 and the frame 20.

[0157] Referring to Figures 7 and 8, in some embodiments, the projection range of the first connecting portion 11 in the first direction X covers and exceeds the projection range of the middle piece 3 in the first direction X; referring to Figure 3, the frame 20 includes a first extension portion 201 extending between the first plate 1 and the second plate 2, and the first extension portion 201 forms a continuous sealed connection with the first connecting portion 11.

[0158] In the above embodiment, the projection range of the first connecting portion 11 in the first direction X covers and exceeds the projection range of the middle piece 3 in the first direction X, so that the first plate 1, the middle piece 3, and the second plate 2 are first assembled, and then the first extension portion 201 of the frame 20 is inserted between the first plate 1 and the second plate 2, so as to achieve a continuous sealed connection between the first plate 1 and the frame 20 from the side of the first plate 1 facing away from the second plate 2. The first extension portion 201 is used to connect the frame 20 to the end plate 10 and also provides support for the welding of the first plate 1.

[0159] In some embodiments, the side of the first extension portion 201 facing away from the second plate 2 forms a continuous sealed connection with the first connection portion 11 .

[0160] In the above embodiment, the first extension portion 201 of the frame 20 is inserted between the first plate 1 and the second plate 2, and the side of the first extension portion 201 facing away from the second plate 2 abuts against the first connecting portion 11 to form a continuous sealed connection, thereby realizing a continuous sealed connection between the first plate 1 and the frame 20.

[0161] In the above embodiment, the first plate 1 and the second plate 2 are first assembled into the end plate 10, and then the first connecting portion 11 and the first extension portion 201 of the frame 20 are continuously sealed and connected from the cavity surrounded by the frame 20. The first extension portion 201 is used to realize the connection between the frame 20 and the end plate 10, and can also play a supporting role in the welding of the first plate 1.

[0162] In some embodiments, the projection range of the first connecting portion 11 in the first direction X covers and exceeds the projection range of the middle member 3 in the first direction X. The projection range of the second connecting portion 21 in the first direction X covers and exceeds the projection range of the first connecting portion 11 in the first direction X. This allows the first extending portion 201 to extend between the first plate 1 and the second plate 2.

[0163] In some embodiments, the first extension portion 201 abuts against the circumferential outer edge of the intermediate component 3 .

[0164] In some embodiments, the frame 20 further includes a first limiting portion 203 . The first limiting portion 203 is provided on a side of the first extension portion 201 away from the second plate 2 . The first limiting portion 203 abuts against the circumferential outer edge of the first plate 1 .

[0165] In the above embodiment, the first limiting portion 203 abuts against the circumferential outer edge of the first plate 1 to position the first plate 1 and to achieve a continuous sealed connection between the first plate 1 and the first limiting portion 203 and the first extension portion 201 .

[0166] In the above embodiment, the first limiting portion 203 is arranged on the side of the first extension portion 201 away from the second plate 2. The first limiting portion 203 and the first extension portion 201 form a step-like structure, which can not only limit the first plate 1, but also form a continuous sealed connection with the first plate 1.

[0167] In some embodiments, a side of the first limiting portion 203 facing away from the second plate 2 is flush with a side of the first plate 1 facing away from the second plate 2 .

[0168] In the above embodiment, the side of the first limiting portion 203 facing away from the second plate 2 is flush with the side of the first plate 1 facing away from the second plate 2 , thereby forming a flat bottom structure in the box.

[0169] Referring to Figures 11 and 12, in some embodiments, the projection range of the middle piece 3 in the first direction X covers and exceeds the projection range of the first connecting portion 11 in the first direction X; referring to Figures 4 and 5, the frame 20 includes a second extension portion 202, and the second extension portion 202 is located on the side of the first plate 1 away from the second plate 2, and the second extension portion 202 forms a continuous sealed connection with the first connecting portion 11.

[0170] In the above embodiment, the projection range of the middle piece 3 in the first direction X covers and exceeds the projection range of the first connecting portion 11 in the first direction X, and is used to achieve a continuous sealed connection between the first plate 1 and the frame 20 from the side of the first plate 1 close to the second plate 2, and then assemble the middle piece 3 and the second plate 2.

[0171] In the above embodiment, the first plate 1 is first supported by the second extension portion 202, the first connecting portion 11 is continuously and sealedly connected to the second extension portion 202 of the frame 20, and then the second plate 2 is assembled. The second extension portion 202 is used to connect the frame 20 to the end plate 10 and also supports the welding of the first plate 1.

[0172] In some embodiments, the second extension portion 202 is adjacent to a side of the second plate 2 and forms a continuous sealed connection with the first connection portion 11 .

[0173] In the above embodiment, the second extension portion 202 is located on the side of the first plate 1 facing away from the second plate 2, and the second extension portion 202 is adjacent to the side of the second plate 2 and abuts against the first connection portion 11, forming a continuous sealed connection with the first connection portion 11, thereby realizing a continuous sealed connection between the first plate 1 and the frame 20.

[0174] In some embodiments, the frame 20 further includes a second limiting portion 204 . The second limiting portion 204 is disposed on a side of the second extending portion 202 adjacent to the second plate 2 . The second limiting portion 204 abuts against the circumferential outer edge of the first plate 1 .

[0175] In the above embodiment, the second limiting portion 204 abuts against the circumferential outer edge of the first plate 1 to position the first plate 1 and to achieve a continuous sealed connection between the first plate 1 and the second limiting portion 204 and the second extending portion 202 .

[0176] In some embodiments, a side of the second limiting portion 204 adjacent to the second plate 2 is flush with a side of the first plate 1 adjacent to the second plate 2 .

[0177] In the above embodiment, the second limiting portion 204 is used to limit the first plate 1 .

[0178] In some embodiments, the projection of the middle member 3 in the first direction X covers and exceeds the projection of the first plate 1 in the first direction X, and the projection of the second plate 2 in the first direction X covers and exceeds the projection of the middle member 3 in the first direction X. The first direction X is parallel to the direction from the first plate 1 to the second plate 2.

[0179] In the above embodiment, the circumferential edge of the middle piece 3 exceeds the circumferential edge of the first plate 1, and is used to abut against the frame 20. The circumferential edge of the second plate 2 exceeds the circumferential edge of the middle piece 3, and is used to enable the second plate 2 to cover the frame 20 and achieve connection with the frame 20.

[0180] Some embodiments of the present application further provide a battery 100 comprising the box body in any of the above embodiments.

[0181] The box body may be at least one of the first box body 101a and the second box body 101b.

[0182] In some embodiments, the battery 100 further includes at least one battery cell 102. The at least one battery cell 102 includes two or more battery cells 102. The battery cells 102 can be connected in series, in parallel, or in hybrid mode. Hybrid mode refers to a combination of series and parallel modes.

[0183] In some embodiments, the battery 100 includes a first housing 101a and a second housing 101b , wherein a plurality of battery cells 102 are connected in parallel, series, or in a hybrid manner and placed in a closed chamber formed by the first housing 101a and the second housing 101b being fastened together.

[0184] At least one of the first box body 101a and the second box body 101b adopts the box body provided by any of the above embodiments of the present application, and accordingly has the beneficial effects of the box body.

[0185] Some embodiments of the present application further provide an electrical device, which includes the battery 100 in any of the above embodiments.

[0186] The electrical device includes the battery 100 in any of the above embodiments and correspondingly possesses the beneficial effects of the battery 100 .

[0187] In some embodiments, the powered device includes a vehicle.

[0188] Some embodiments of the present application further provide a method for assembling a box, which includes the following steps:

[0189] providing a frame 20; and

[0190] Provide an end plate 10, the end plate 10 includes a first connecting portion 11 and a second connecting portion 21 facing the frame 20;

[0191] The circumferential edges of the first connection portion 11 and the second connection portion 21 are both connected to the frame 20 ; wherein the entire circumferential edge of at least one of the first connection portion 11 and the second connection portion 21 is continuously and sealedly connected to the frame 20 .

[0192] In the above embodiment, the entire circumferential edge of at least one of the first connection part 11 and the second connection part 21 is continuously sealed and connected to the frame 20, so as to achieve sealing at the connection between the end plate 10 and the frame 20. It has a simple structure, is easy to install, has high assembly efficiency, low cost and good reliability.

[0193] In some embodiments, the first connection portion 11 is closer to the interior space of the box than the second connection portion 21;

[0194] Continuously sealingly connecting the entire circumferential edge of at least one of the first connecting part 11 and the second connecting part 21 to the frame 20 includes: continuously sealingly connecting the entire circumferential edge of the first connecting part 11 to the frame 20, and connecting the circumferential edge of the second connecting part 21 to the frame 20 through at least two connecting members 30.

[0195] In the above embodiment, the first connecting portion 11 forms a continuous sealed connection with the frame 20, which is used to achieve a seal at the connection between the end plate 10 and the frame 20. The second connecting portion 21 is connected to the frame 20 via at least two connecting members 30, which is used to improve the connection strength between the end plate 10 and the frame 20. The end plate 10 has a small number of parts and a simple structure. The connection operation between the end plate 10 and the frame 20 is convenient, low-cost, and highly reliable.

[0196] In the above embodiment, the end plate 10 is first manufactured and then connected to the frame 20. The connection between the end plate 10 and the frame 20 is divided into an upper connection and a lower connection. The upper part of the end plate 10 adopts a continuous sealing connection to connect the first plate 1 to the frame 20, and the lower part of the end plate 10 connects the second plate 2 to the frame 20 through a connecting member 30; the upper and lower double connection fastening method has a simple structure, easy installation, high assembly efficiency, low cost and good reliability.

[0197] In some embodiments, the end plate 10 includes a first plate 1 and a second plate 2 stacked along a first direction X; the first connecting portion 11 is located on the first plate 1, and the second connecting portion 21 is located on the second plate 2;

[0198] Before connecting the circumferential edge of the first connecting portion 11 and the circumferential edge of the second connecting portion 21 to the frame 20, the assembly method further includes:

[0199] The frame 20 is placed on a side of the second plate 2 adjacent to the first plate 1. The frame 20 is arranged around the circumferential outer edge of the first plate 1. The first extension portion 201 on the frame 20 extends between the first plate 1 and the second plate 2.

[0200] Continuously sealingly connecting the entire circumferential edge of at least one of the first connection portion 11 and the second connection portion 21 to the frame 20 includes:

[0201] Forming a continuous sealed connection between the entire circumferential edge of the first connecting portion 11 and the first extending portion 201; and

[0202] The peripheral edge of the second connecting portion 21 is connected to the frame 20 through at least two connecting members 30 .

[0203] In the above embodiment, the end plate 10 includes a first plate 1 and a second plate 2 that are stacked. The first connecting portion 11 of the first plate 1 forms a continuous sealed connection with the frame 20, which is used to achieve a seal at the connection between the end plate 10 and the frame 20. The second connecting portion 21 of the second plate 2 is connected to the frame 20 via at least two connecting members 30, which is used to improve the connection strength between the end plate 10 and the frame 20. The end plate 10 has a small number of parts and a simple structure. The connection operation between the end plate 10 and the frame 20 is convenient, low-cost, and highly reliable.

[0204] In some embodiments, the end plate 10 includes a first plate 1 and a second plate 2 stacked along a first direction X; the first connecting portion 11 is located on the first plate 1, and the second connecting portion 121 is located on the second plate 2, wherein;

[0205] Providing the frame 20 includes: placing the frame 20 so that the end portion of the frame 20 connected to the end plate 10 is located above the cavity enclosed by the frame 20;

[0206] Continuously sealingly connecting the entire circumferential edge of at least one of the first connecting portion 11 and the second connecting portion 21 to the frame 20 includes: placing the first plate 1 within the end of the frame 20 and supported by the second extension portion 202 on the frame 20; continuously sealingly connecting the entire circumferential edge of the first connecting portion 11 to the second extension portion 202; and

[0207] The second plate 2 is arranged on a side of the first plate 1 away from the frame 20 , the second plate 2 covers the frame 20 , and the circumferential edge of the second connecting portion 21 is connected to the frame 20 via at least two connecting members 30 .

[0208] In the above embodiment, the end plate 10 includes a first plate 1 and a second plate 2 that are stacked. The first connecting portion 11 of the first plate 1 forms a continuous sealed connection with the frame 20, which is used to achieve a seal at the connection between the end plate 10 and the frame 20. The second connecting portion 21 of the second plate 2 is connected to the frame 20 via at least two connecting members 30, which is used to improve the connection strength between the end plate 10 and the frame 20. The end plate 10 has a small number of parts and a simple structure. The connection operation between the end plate 10 and the frame 20 is convenient, low-cost, and highly reliable.

[0209] In the above embodiment, the first plate 1 of the end panel 10 is first connected to the frame 20 in a continuous and sealed manner, and then the second plate 2 is installed. Finally, the second plate 2 is integrally connected to the frame 20, forming a box structure with few parts and a simple structure. This double connection and fastening method of the upper and lower parts has a simple structure, convenient installation, high assembly efficiency, low cost, and high reliability.

[0210] This application provides two methods for assembling the box, which are described below in conjunction with Figures 13 to 23.

[0211] 13 to 16 , some embodiments provide a method for assembling a box, which includes the following steps:

[0212] 13 , an end plate 10 and a frame 20 are prepared, wherein the end plate 10 includes a first plate 1 and a second plate 2 stacked together;

[0213] Referring to FIG14 , a frame 20 is placed on a side of the second plate 2 adjacent to the first plate 1 . The frame 20 surrounds the circumferential outer edge of the first plate 1 , and a first extension 201 on the frame 20 extends between the first plate 1 and the second plate 2 (see FIG3 ). The circumferential edge of the first plate 1 is continuously sealed to the first extension 201 .

[0214] 15 , the peripheral edge of the second plate 2 is connected to the frame 20 via at least two connecting members 30 .

[0215] 16 is a schematic diagram of the box after assembly, the circumferential edge of the first plate 1 forms a continuous sealed connection with the first extension portion 201 , and the circumferential edge of the second plate 2 is connected to the frame 20 via at least two connectors 30 .

[0216] In the above embodiment, the end plate 10 is first manufactured and then connected to the frame 20. The connection between the end plate 10 and the frame 20 is divided into an upper connection and a lower connection. The upper part of the end plate 10 adopts a continuous sealing connection to connect the first plate 1 to the frame 20, and the lower part of the end plate 10 connects the second plate 2 to the frame 20 through a connecting member 30; the upper and lower double connection fastening method has a simple structure, easy installation, high assembly efficiency, low cost and good reliability.

[0217] 17 to 23 , some other embodiments provide a method for assembling a box, which includes the following steps:

[0218] 18 , the frame 20 is placed so that the end of the frame 20 is located above the cavity enclosed by the frame 20 ;

[0219] 19 , the first plate 1 is placed inside the end of the frame 20 and supported by the second extension 202 on the frame 20 ; the circumferential edge of the first plate 1 is continuously sealed to the second extension 202 ;

[0220] 20 and 21 , the second plate 2 is disposed on the side of the first plate 1 away from the frame 20 , and the second plate 2 covers the frame 20 . Referring to FIG. 22 , the circumferential edge of the second plate 2 is connected to the frame 20 via at least two connectors 30 .

[0221] 23 , which is a schematic diagram of the box after assembly, the circumferential edge of the first plate 1 forms a continuous sealed connection with the second extension portion 202 , and the circumferential edge of the second plate 2 is connected to the frame 20 via at least two connectors 30 .

[0222] In the above embodiment, the first plate 1 of the end panel 10 is first connected to the frame 20 in a continuous and sealed manner, and then the second plate 2 is installed. Finally, the second plate 2 is integrally connected to the frame 20, forming a box structure with few parts and a simple structure. This double connection and fastening method of the upper and lower parts has a simple structure, convenient installation, high assembly efficiency, low cost, and high reliability.

[0223] It should be noted that the weld 40 shown in Figures 13, 17 and 18 can be formed after welding the first plate 1 and the frame 20. The weld 40 is shown separately in order to clearly show the various components of the box.

[0224] Two embodiments of the end plate 10 and two assembly methods of the box are listed below.

[0225] First embodiment: Referring to FIG. 6 to FIG. 8 , the end plate 10 includes a first plate 1 , a middle member 3 , and a second plate 2 that are stacked.

[0226] The projection of the first plate 1 in the first direction X covers and exceeds the projection of the middle member 3 in the first direction X. The projection of the second plate 2 in the first direction X covers and exceeds the projection of the first plate 1 in the first direction X. The first direction X is parallel to the direction from the first plate 1 to the second plate 2.

[0227] The first plate 1 is an aluminum plate and has a thickness ranging from 1.5 mm to 2.5 mm.

[0228] The second plate 2 is a steel plate or an aluminum plate. The second plate 2 is a steel plate, and the thickness of the second plate 2 ranges from 0.5 mm to 1.5 mm. The second plate 2 is an aluminum plate, and the thickness of the second plate 2 ranges from 1 mm to 2 mm.

[0229] The middle piece 3 is a honeycomb panel. The material of the middle piece 3 can be plastic or aluminum. For example, the plastic can be PP (polypropylene) to form a honeycomb plastic or honeycomb aluminum panel. When the middle piece 3 is a honeycomb aluminum panel, aluminum alloy brazing is used to integrate the first plate 1, the second plate 2 and the middle piece 3 into one, forming an end plate 10 with a three-layer structure having good rigidity and high strength. When the middle piece 3 is a honeycomb plastic, PP film is attached to the upper and lower surfaces of the honeycomb panel, and the first plate 1, the second plate 2 and the middle piece 3 are integrated into one by hot pressing and hot melting to form an end plate 10 with a three-layer structure having good rigidity and high strength. The thickness H1 of the middle piece 3 has a value range of 5 mm to 10 mm. Referring to FIG9 , the honeycomb structure includes a first honeycomb structure 33, and the first honeycomb structure 33 is a hexagonal honeycomb structure. Referring to FIG10 , the honeycomb structure also includes a second honeycomb structure 34, and the second honeycomb structure 34 is a circular honeycomb structure.

[0230] 8 , the projection of the second plate 2 in the first direction X covers and exceeds the projection of the first plate 1 in the first direction X. The dimension L1 of the second plate 2 exceeding the first plate 1 ranges from 10 mm to 50 mm.

[0231] The first assembly method of the box, that is, the assembly method of the end plate 10 and the frame 20 in the first embodiment is:

[0232] 13 , an end plate 10 and a frame 20 are prepared, wherein the end plate 10 includes a first plate 1 , a middle member 3 , and a second plate 2 that are stacked;

[0233] 3 and 14 , a frame 20 is placed on a side of the second plate 2 adjacent to the first plate 1 . The frame 20 is disposed around the circumferential outer edge of the first plate 1 . A first extension 201 on the frame 20 extends between the first plate 1 and the second plate 2 and abuts against the intermediate member 3 . The circumferential edge of the first plate 1 and the first extension 201 are continuously sealed by friction stir welding (FSW).

[0234] 15 , the peripheral edge of the second plate 2 is connected to the frame 20 by at least two hot-melt self-tapping screws (FDS).

[0235] Refer to Figure 16, which is a schematic diagram after the box is assembled. The circumferential edge of the first plate 1 and the first extension portion 201 are continuously sealed by friction stir welding (FSW), and the circumferential edge of the second plate 2 is connected to the frame 20 by at least two hot melt self-tapping screws (FDS).

[0236] In the first embodiment, the end plate 10 is first manufactured and then connected to the frame 20. The end plate 10 can serve as the bottom plate of the box. The connection between the end plate 10 and the frame 20 is divided into an upper connection and a lower connection. The upper part of the end plate 10 uses FSW to connect the first plate to the frame, and the lower part of the end plate 10 uses FDS to connect the second plate to the frame.

[0237] The FSW and FDS connections integrate the end plate 10 and frame 20, creating a simple box structure with few components. The dual-connection fastening system at the top and bottom provides a simple structure, easy installation, high assembly efficiency, low cost, and excellent reliability. This design is suitable for widespread adoption and has high market value.

[0238] In the first embodiment, the FSW weld is located at the bottom of the inner cavity of the box, that is, the end plate 10 and the frame 20 are welded from the inside of the cavity surrounded by the frame 20. Because the weld is close to the circumferential sidewalls of the frame 20, when the cavity surrounded by the frame 20 is deep, the space is limited and friction stir welding cannot be performed, or a customized special friction stir welding head equipment is required. In this case, the end plate 10 provided in the second embodiment below and the second assembly method of the box can be used.

[0239] Second embodiment: with reference to FIG. 6 , FIG. 11 and FIG. 12 , the end plate 10 includes a first plate 1 , a middle member 3 and a second plate 2 which are stacked.

[0240] The projection of the middle member 3 in the first direction X covers and exceeds the projection of the first plate 1 in the first direction X. The projection of the second plate 2 in the first direction X covers and exceeds the projection of the middle member 3 in the first direction X. The first direction X is parallel to the direction from the first plate 1 to the second plate 2.

[0241] The first plate 1 is an aluminum plate and has a thickness ranging from 1.5 mm to 2.5 mm.

[0242] The second plate 2 is a steel plate or an aluminum plate. The second plate 2 is a steel plate, and the thickness of the second plate 2 ranges from 0.5 mm to 1.5 mm. The second plate 2 is an aluminum plate, and the thickness of the second plate 2 ranges from 1 mm to 2 mm.

[0243] The middle piece 3 is a honeycomb panel. The material of the middle piece 3 can be plastic or aluminum. For example, the plastic can be PP (polypropylene) to form a honeycomb plastic or honeycomb aluminum panel. When the middle piece 3 is a honeycomb aluminum panel, aluminum alloy brazing is used to integrate the first plate 1, the second plate 2 and the middle piece 3 into one, forming an end plate 10 with a three-layer structure having good rigidity and high strength. When the middle piece 3 is a honeycomb plastic, PP film is attached to the upper and lower surfaces of the honeycomb panel, and the first plate 1, the second plate 2 and the middle piece 3 are integrated into one by hot pressing and hot melting to form an end plate 10 with a three-layer structure having good rigidity and high strength. The thickness H2 of the middle piece 3 ranges from 5 mm to 10 mm. Referring to FIG9 , the honeycomb structure includes a first honeycomb structure 33, and the first honeycomb structure 33 is a hexagonal honeycomb structure. Referring to FIG10 , the honeycomb structure also includes a second honeycomb structure 34, and the second honeycomb structure 34 is a circular honeycomb structure.

[0244] 12 , the projection of the second plate 2 in the first direction X covers and exceeds the projection of the first plate 1 in the first direction X. The dimension L2 of the second plate 2 exceeding the first plate 1 ranges from 25 mm to 60 mm.

[0245] The second assembly method of the box, that is, the assembly method of the end plate 10 and the frame 20 in the second embodiment is:

[0246] 18 , the frame 20 is placed so that the end of the frame 20 is located above the cavity enclosed by the frame 20 .

[0247] Referring to Figure 19, the first plate 1 and the frame 20 are formed by FSW to form a box half assembly of the first plate 1 including only the end plate 10, specifically: the first plate 1 is placed in the end of the frame 20 and supported by the second extension 202 on the frame 20; the circumferential edge of the first plate 1 and the second extension 202 are continuously sealed by friction stir welding (FSW).

[0248] Referring to Figures 20 and 21, the first plate 1, the middle piece 3 and the second plate 2 of the box half assembly are hot-pressed into shape. Specifically, the middle piece 3 is placed on the side of the first plate 1 away from the frame 20, and the second plate 2 is placed on the side of the middle piece 3 away from the first plate 1, and the second plate 2 covers the frame 20, and the first plate 1, the middle piece 3 and the second plate 2 are hot-pressed into shape.

[0249] 22 , the second plate 2 is rigidly connected to the frame 20 using FDS, specifically, the circumferential edge of the second plate 2 is connected to the frame 20 via at least two hot-melt self-tapping screws FDS.

[0250] Refer to Figure 23, which is a schematic diagram after the box is assembled. The circumferential edge of the first plate 1 and the second extension portion 202 are continuously sealed by friction stir welding (FSW), and the circumferential edge of the second plate 2 is connected to the frame 20 by at least two hot melt self-tapping screws (FDS).

[0251] In the second embodiment, the first plate 1 of the end plate 10 is first connected to the frame 20 by FSW, and then the middle piece 3 is inlaid, and finally the second plate 2 is assembled. The first plate 1, the middle piece 3 and the second plate 2 are integrated into one by hot pressing and hot melting to form an end plate 10 with a three-layer structure having good rigidity and high strength. Then, the FDS connection method is adopted to connect the second plate 2 to the frame 20 to form a box structure with few parts and a simple structure. In summary, this box structure has few parts and a double connection and fastening method at the top and bottom, which is simple in structure, easy to install, high in assembly efficiency, low in cost and high in reliability. It can be promoted and used on a large scale and has a high market value.

[0252] 3 , which shows a first embodiment of a box body, the box body includes the end plate 10 provided in the first embodiment and is formed using the first assembly method of the box body.

[0253] 4 , which shows a second embodiment of a box body, the box body includes the end plate 10 provided in the second embodiment and is formed using a second assembly method for the box body.

[0254] 5 shows a third embodiment of a box body, wherein the end plate 10 of the box body is different from the middle piece 3 of the end plate 10 provided in the second embodiment, but the other structures are the same.

[0255] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A box, comprising: Border(20); as well as An end plate (10) is connected to the frame (20), wherein the end plate (10) comprises a first connection portion (11) and a second connection portion (21) facing the frame (20); the circumferential edge of the first connection portion (11) and the circumferential edge of the second connection portion (21) are both connected to the frame (20); wherein the entire circumferential edge of at least one of the first connection portion (11) and the second connection portion (21) is continuously and sealedly connected to the frame (20).

2. The box according to claim 1, wherein the first connecting portion (11) and the second connecting portion (21) are not on the same plane.

3. The box according to claim 1 or 2, wherein the first connection portion (11) is closer to the internal space of the box than the second connection portion (21).

4. A box according to any one of claims 1 to 3, wherein the entire circumferential edge of the first connecting portion (11) is continuously sealed and connected to the frame (20), and the circumferential edge of the second connecting portion (21) is connected to the frame (20) via at least two connecting members (30).

5. The box according to any one of claims 1 to 4, wherein the entire circumferential edge of at least one of the first connecting portion (11) and the second connecting portion (21) is continuously sealed and connected to the frame (20) by friction stir welding.

6. A box according to any one of claims 1 to 5, wherein the entire circumferential edge of one of the first connecting portion (11) and the second connecting portion (21) is continuously and sealedly connected to the frame (20), and the circumferential edge of the other one is connected to the frame (20) via at least two connecting members (30).

7. The box according to claim 4 or 6, wherein the connecting member (30) comprises a hot melt self-tapping screw.

8. A box body according to any one of claims 1 to 7, wherein the end plate (10) comprises a first plate (1) and a second plate (2) stacked along a first direction (X); the first connecting portion (11) is located on the first plate (1), and the second connecting portion (21) is located on the second plate (2).

9. The box body according to claim 8, wherein the end plate (10) further comprises a middle piece (3) arranged between the first plate (1) and the second plate (2), wherein the middle piece (3) connects the first plate (1) and the second plate (2) and forms a gap between the first plate (1) and the second plate (2).

10. The casing according to claim 9, wherein the intermediate member (3) is constructed as a honeycomb structure.

11. The box according to claim 9 or 10, wherein the middle piece (3) forms at least one flow channel (4) between the first plate (1) and the second plate (2), and an extension direction of the flow channel (4) intersects with the first direction (X).

12. The box according to claim 9, wherein the middle piece (3) comprises a first part (31) and a second part (32), wherein: The first component (31) is constructed as a honeycomb structure, and the second component (32) forms at least one flow channel (4) between the first component (31) and the first plate (1) or the second plate (2); the extension direction of the flow channel (4) intersects with the first direction (X).

13. A box according to any one of claims 8 to 12, wherein the projection range of the second connecting portion (21) in the first direction (X) covers and exceeds the projection range of the first connecting portion (11) in the first direction (X); the frame (20) is arranged on a side of the second plate (2) adjacent to the first plate (1), and the frame (20) is arranged around the circumferential outer edge of the first plate (1).

14. The box body according to claim 13, wherein the projection range of the first connecting portion (11) in the first direction (X) covers and exceeds the projection range of the middle piece (3) in the first direction (X); the frame (20) includes a first extension portion (201) extending between the first plate (1) and the second plate (2), and the first extension portion (201) forms a continuous sealed connection with the first connecting portion (11).

15. The box according to claim 14, wherein a side of the first extension portion (201) facing away from the second plate (2) forms a continuous sealed connection with the first connection portion (11).

16. A box according to claim 14 or 15, wherein the frame (20) further comprises a first limiting portion (203), the first limiting portion (203) being arranged on a side of the first extension portion (201) away from the second plate (2), the first limiting portion (203) being in contact with a circumferential outer edge of the first plate (1).

17. The box according to claim 16, wherein a side of the first limiting portion (203) facing away from the second plate (2) is flush with a side of the first plate (1) facing away from the second plate (2).

18. A box according to claim 13, wherein the projection range of the middle piece (3) in the first direction (X) covers and exceeds the projection range of the first connecting portion (11) in the first direction (X); the frame (20) includes a second extension portion (202), the second extension portion (202) is located on the side of the first plate (1) away from the second plate (2), and the second extension portion (202) forms a continuous sealed connection with the first connecting portion (11).

19. The box according to claim 18, wherein a side of the second extension portion (202) adjacent to the second plate (2) forms a continuous sealed connection with the first connection portion (11).

20. A box according to claim 18 or 19, wherein the frame (20) further comprises a second limiting portion (204), the second limiting portion (204) being arranged on a side of the second extension portion (202) adjacent to the second plate (2), the second limiting portion (204) being in contact with the circumferential outer edge of the first plate (1).

21. The box according to claim 20, wherein a side of the second limiting portion (204) adjacent to the second plate (2) is flush with a side of the first plate (1) adjacent to the second plate (2).

22. A battery comprising the casing according to any one of claims 1 to 21.

23. An electrical device comprising the battery according to claim 22.

24. A method for assembling a box, comprising the following steps: providing a border (20); as well as Providing an end plate (10), wherein the end plate (10) comprises a first connecting portion (11) and a second connecting portion (21) facing the frame (20); The circumferential edge of the first connecting portion (11) and the circumferential edge of the second connecting portion (21) are both connected to the frame (20); wherein the entire circumferential edge of at least one of the first connecting portion (11) and the second connecting portion (21) is continuously and sealedly connected to the frame (20).

25. The assembly method according to claim 24, wherein: The first connection portion (11) is closer to the internal space of the box body than the second connection portion (21); The step of continuously and sealingly connecting the entire circumferential edge of at least one of the first connecting portion (11) and the second connecting portion (21) to the frame (20) comprises: continuously and sealingly connecting the entire circumferential edge of the first connecting portion (11) to the frame (20), and connecting the circumferential edge of the second connecting portion (21) to the frame (20) via at least two connecting members (30).

26. The method for assembling a box according to claim 24 or 25, wherein: The end plate (10) comprises a first plate (1) and a second plate (2) stacked along a first direction (X); the first connecting portion (11) is located on the first plate (1), and the second connecting portion (21) is located on the second plate (2); Wherein, before the circumferential edge of the first connecting portion (11) and the circumferential edge of the second connecting portion (21) are connected to the frame (20), the assembling method further comprises: The frame (20) is placed on a side of the second plate (2) adjacent to the first plate (1), the frame (20) is arranged around the circumferential outer edge of the first plate (1), and the first extension portion (201) on the frame (20) extends between the first plate (1) and the second plate (2); The entire circumference of at least one of the first connecting portion (11) and the second connecting portion (21) is The edge is continuously sealed and connected to the frame (20) including: The entire circumferential edge of the first connecting portion (11) is continuously sealed and connected to the first extending portion (201); and The peripheral edge of the second connecting portion (21) is connected to the frame (20) via at least two connecting members (30).

27. The method for assembling a box as claimed in claim 24, wherein: The end plate (10) comprises a first plate (1) and a second plate (2) stacked along a first direction (X); the first connecting portion (11) is located on the first plate (1), and the second connecting portion (121) is located on the second plate (2), wherein; Providing the frame (20) comprises: placing the frame (20) so that the end of the frame (20) connected to the end plate (10) is located above the cavity surrounded by the frame (20); The step of continuously and sealingly connecting the entire circumferential edge of at least one of the first connecting portion (11) and the second connecting portion (21) to the frame (20) comprises: placing the first plate (1) inside the end of the frame (20) and supporting it through the second extension portion (202) on the frame (20); continuously and sealingly connecting the entire circumferential edge of the first connecting portion (11) to the second extension portion (202); and The second plate (2) is arranged on a side of the first plate (1) away from the frame (20), the second plate (2) covers the frame (20), and the peripheral edge of the second connecting portion (21) is connected to the frame (20) via at least two connecting members (30).

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