End plate, box body, battery, electric device and assembling method of box body

Abstract

The invention discloses an end plate, a box body, a battery, a power utilization device and an assembling method of the box body. Wherein the end plate (10) comprises: a first plate (1) comprising a first connection portion (11), the first connection portion (11) being arranged in a closed loop along a circumferential edge of the first plate (1) and configured to form a continuous sealing connection with an environmental component; the second plate (2) and the first plate (1) are stacked in the first direction (X); and the second plate (2) comprises second connecting parts (21) which are arranged along the circumferential edge of the second plate (2) at intervals. Wherein the first connecting part (11) of the first plate (1) is in continuous sealing connection with an environment component and used for sealing the joint of the end plate (10) and the environment component, and the second connecting parts (21) of the second plate (2) are connected with the environment component through connecting pieces (30) and used for improving the connecting strength of the end plate (10) and the environment component. The end plate (10) has the advantages of few parts, simple structure, convenience in connection operation with environmental parts, low cost and high reliability.

Description

End plate, box, battery, electrical device and box assembly method

[0001] The present application relates to the field of battery technology, and in particular to an end plate, a box, a battery, an electrical device and an assembly method of the box.

[0002] In some related technologies, the battery includes a box body and a battery cell. The battery cell is placed in the box body. The end plate of the box body has many parts and a complex structure.

[0003] Summary of the invention

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

[0005] Some embodiments of the present application also provide an end plate, which includes: a first plate, including a first connecting portion, which is arranged in a closed loop along the circumferential edge of the first plate and is configured to form a continuous sealed connection with the environmental component; and a second plate, which is stacked with the first plate along a first direction; the second plate includes a second connecting portion arranged at intervals along the circumferential edge of the second plate, and the second connecting portion is configured to be connected to the environmental component through a connecting piece.

[0006] In the above embodiment, the end plate includes a first plate and a second plate which are stacked. The first connection portion of the first plate forms a continuous sealing connection with the environmental component, which is used to achieve the sealing of the connection between the end plate and the environmental component. The second connection portion of the second plate is connected to the environmental component through a connecting piece, which is used to improve the connection strength between the end plate and the environmental component. The end plate has fewer parts, a simple structure, convenient connection operation with the environmental component, low cost, and high 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 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.

[0010] In the above embodiment, an intermediate piece is arranged between the first plate and the second plate, and 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.

[0011] In some embodiments, the intermediate member is configured as a honeycomb structure.

[0012] In the above embodiment, a middle piece with a honeycomb structure is arranged 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.

[0013] In some embodiments, the intermediate piece forms at least one flow channel between the first plate and the second plate, and an extension direction of the flow channel intersects with the first direction.

[0014] 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.

[0015] In some embodiments, the middle piece includes a first component and a second component, the first component is configured 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, and an extension direction of the flow channel intersects with the first direction.

[0016] In the above embodiment, the middle piece includes a first component and a second component. The first component is constructed as a honeycomb structure, which can provide a buffering effect and improve the ability of the end plate to withstand impact. The second component 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 second component to improve the ability of the end plate to withstand impact.

[0017] In some embodiments, a projection range of the second connection portion in the first direction covers and exceeds a projection range of the first connection portion in the first direction.

[0018] In the above embodiment, the circumferential edge of the second plate exceeds the circumferential edge of the first plate, so that the first connecting portion of the circumferential edge of the first plate forms a continuous sealed connection with the environmental component, and at least two connecting members spaced apart at the circumferential edge of the second plate are connected to the environmental component.

[0019] In some embodiments, a projection range of the first connection portion in the first direction covers and exceeds a projection range of the middle piece in the first direction.

[0020] In the above embodiment, the circumferential edge of the first plate exceeds the circumferential edge of the middle piece, so as to realize first assembling the first plate, the middle piece and the second plate, and then inserting the extension portion of the environmental component between the first plate and the second plate, so as to realize a continuous sealed connection between the first plate and the environmental component from the side of the first plate facing away from the second plate.

[0021] In some embodiments, a projection range of the intermediate piece in the first direction covers and exceeds a projection range of the first connecting portion in the first direction.

[0022] In the above embodiment, the circumferential edge of the middle piece exceeds the circumferential edge of the first plate, so as to realize continuous sealing connection between the first plate and the environmental component from the side of the first plate close to the second plate, and then assemble the middle piece and the second plate.

[0023] Some embodiments of the present application further provide a box body, which includes: the end plate in any of the above embodiments; and a frame, which is the environmental component.

[0024] In the above embodiments, the box body includes the end plate in any of the above embodiments, and correspondingly has the beneficial effects of the end plate.

[0025] In some embodiments, the first connection portion is closer to the inner space of the box body than the second connection portion.

[0026] In the above embodiment, the first connection portion is closer to the inner space of the box body than the second connection portion, 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.

[0027] In some embodiments, the first connection portion and the frame are continuously sealed by friction stir welding.

[0028] In the above embodiment, the first connection portion and the frame are connected by stir friction welding, which is easy to operate, conducive to mechanization and automation, simple in equipment and low in cost.

[0029] In some embodiments, the housing further comprises the connecting piece, and the connecting piece comprises a hot-melt self-tapping screw.

[0030] In the above embodiment, the second connection portion is connected to the frame by hot-melt self-tapping screws, which does not require pre-punching, is easy to operate and has low cost.

[0031] 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.

[0032] In the above embodiment, the frame is arranged on a side of the second plate adjacent to the first plate, the second plate covers the frame, the frame is arranged around the circumferential outer edge of the first plate, 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, and is used to realize that the first connecting portion at the circumferential edge of the first plate forms a continuous sealed connection with the frame, and can form a sealed connection between the frame and the end plate, so that the cavity enclosed by the frame forms a seal at the end plate; at least two connecting members spaced apart at the circumferential edge of the second plate are connected to the frame, and are used to improve the connection strength between the end plate and the frame.

[0033] 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.

[0034] In the above embodiment, 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, so as to realize the first plate, the middle piece and the second plate are assembled first, and then the first extension portion of the frame is inserted between the first plate and the second plate, so as to realize the continuous sealing connection between the first plate and the frame from the side of the first plate away from the second plate. The first extension portion is used to realize the connection between the frame and the end plate, and can also play a supporting role in the welding of the first plate.

[0035] In some embodiments, a side of the first extension portion facing away from the second plate forms a continuous sealed connection with the first connection portion.

[0036] 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 connecting portion to form a continuous sealed connection, thereby achieving a continuous sealed connection between the first plate and the frame.

[0037] In some embodiments, the frame further includes a first limiting portion, which is disposed on a side of the first extending portion facing away from the second plate, and the first limiting portion abuts against a circumferential outer edge of the first plate.

[0038] In the above embodiment, the first limiting portion abuts against the circumferential outer edge of the first plate, which 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.

[0039] 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.

[0040] 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, so that a flat bottom structure can be formed in the box.

[0041] 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, the second extension portion 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.

[0042] In the above embodiment, 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, and is used to realize continuous sealing connection between the first plate and the frame from the side of the first plate close to the second plate, and then assemble the middle piece and the second plate; first support the first plate through the second extension portion, form a continuous sealing connection between the first connecting portion and the second extension portion of the frame, and then assemble the second plate. The second extension portion is used to realize the connection between the frame and the end plate, and also to support the welding of the first plate.

[0043] In some embodiments, the second extension portion is adjacent to a side of the second plate and forms a continuous sealed connection with the first connection portion.

[0044] 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 abuts against the first connection portion on the side adjacent to the second plate to form a continuous sealed connection with the first connection portion, thereby achieving a continuous sealed connection between the first plate and the frame.

[0045] In some embodiments, the frame further includes a second limiting portion, which is disposed 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.

[0046] 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.

[0047] 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.

[0048] In the above embodiment, the second limiting portion is used to limit the first plate.

[0049] Some embodiments of the present application further provide a battery, which includes the housing provided by any of the above embodiments.

[0050] In the above embodiments, the battery includes the box body in any of the above embodiments, and correspondingly has the beneficial effects of the box body.

[0051] Some embodiments of the present application further provide an electrical device, which includes the battery provided by any of the above embodiments.

[0052] 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.

[0053] Some embodiments of the present application also provide a method for assembling a box, which includes the following steps: providing a frame; and providing an end plate, the end plate including the first plate and the second plate stacked along a first direction, the first plate including a first connection portion arranged in a closed loop along a circumferential edge of the first plate, and the second plate including a second connection portion arranged at intervals along a circumferential edge of the second plate; and continuously sealingly connecting the entire circumferential edge of at least one of the first connection portion and the second connection portion to the frame.

[0054] 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, so as to achieve sealing at the connection between the end plate and the frame, with simple structure, convenient installation, high assembly efficiency, low cost and good reliability.

[0055] In some embodiments, the first connection portion is closer to the internal space of the box body than the second connection portion; the continuous sealing connection of the entire circumferential edge of at least one of the first connection portion and the second connection portion to the frame includes: continuously sealing the entire circumferential edge of the first connection portion to the frame, and connecting the circumferential edge of the second connection portion to the frame through at least two connecting members.

[0056] In the above embodiment, the first connection portion forms a continuous sealing connection with the frame, which is used to achieve the sealing of the connection between the end plate and the frame, and the second connection portion is connected to the frame through at least two connecting pieces, which is used to improve the connection strength between the end plate and the frame. The end plate has fewer parts and a simple structure, and the connection operation between the end plate and the frame is convenient, low in cost, and high in reliability.

[0057] In some embodiments, before the circumferential edge of the first connecting portion and the circumferential edge of the second connecting portion are connected to the frame, the assembly method also includes: placing the frame 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; the continuous sealing connection of the entire circumferential edge of at least one of the first connecting portion and the second connecting portion to the frame includes: forming a continuous sealing connection between the entire circumferential edge of the first connecting portion and the first extension portion; and connecting the circumferential edge of the second connecting portion to the frame through at least two connecting members.

[0058] 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 and fastening method has a simple structure, convenient installation, high assembly efficiency, low cost and good reliability.

[0059] In some embodiments, providing the frame includes: placing the frame so that the end of the frame connected to the end plate is located above the cavity enclosed by the frame; continuously sealingly connecting the entire circumferential edge of at least one of the first connecting portion and the second connecting portion to the frame includes: placing a first plate inside the end of the frame and supporting it through a second extension portion on the frame; forming a continuous sealing connection between the entire circumferential edge of the first connecting portion and the second extension portion; and arranging a second plate on the side of the first plate facing away from the frame, the second plate covering the frame, and connecting the second connecting portion to the frame through at least two connecting members.

[0060] In the above embodiment, the first plate of the end plate is firstly connected to the frame in a continuous sealing manner, and then the second plate is installed; finally, the second plate is connected to the frame as a whole, forming a box structure with few parts and a simple structure. The upper and lower double connection and fastening method has a simple structure, convenient installation, high assembly efficiency, low cost and high reliability.

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. 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 paying creative work.

[0062] FIG1 is a schematic diagram of the structure of a vehicle disclosed in some embodiments of the present application;

[0063] FIG2 is a schematic diagram of an exploded structure of a battery disclosed in some embodiments of the present application;

[0064] FIG3 is a schematic diagram of an exploded structure of an end plate disclosed in some embodiments of the present application;

[0065] FIG4 is a cross-sectional schematic diagram of the end plate disclosed in the first embodiment of the present application;

[0066] FIG5 is a partial enlarged schematic diagram of FIG4;

[0067] FIG6 is a cross-sectional schematic diagram of a box body disclosed in the first embodiment of the present application;

[0068] FIG7 is a cross-sectional schematic diagram of a box body disclosed in the second embodiment of the present application;

[0069] FIG8 is a cross-sectional schematic diagram of a box body disclosed in the third embodiment of the present application;

[0070] FIG9 is a schematic diagram of a first honeycomb structure disclosed in some embodiments of the present application;

[0071] FIG10 is a schematic diagram of a second honeycomb structure disclosed in some embodiments of the present application;

[0072] FIG11 is a cross-sectional schematic diagram of an end plate disclosed in a second embodiment of the present application;

[0073] FIG12 is a partial enlarged schematic diagram of FIG11;

[0074] FIG13 is a schematic diagram of the exploded structure of the box disclosed in the first embodiment of the present application;

[0075] FIG14 is a schematic top view of the box body disclosed in the first embodiment of the present application;

[0076] FIG15 is a bottom view of the box disclosed in the first embodiment of the present application;

[0077] FIG16 is a partial cross-sectional schematic diagram of the box body disclosed in the first embodiment of the present application;

[0078] FIG17 is a schematic diagram of the exploded structure of the box disclosed in the second embodiment of the present application;

[0079] 18 is a schematic diagram of placing a first plate on the frame of the box disclosed in the second embodiment of the present application;

[0080] 19 is a partial cross-sectional schematic diagram of the frame of the box body after being connected to the first plate according to the second embodiment of the present application;

[0081] 20 is a schematic diagram of placing an intermediate piece and a second plate after the frame of the box disclosed in the second embodiment of the present application is connected to the first plate;

[0082] 21 is a schematic diagram of a box body disclosed in the 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;

[0083] 22 is a schematic diagram of the connection between the second plate and the frame of the box body disclosed in the second embodiment of the present application;

[0084] FIG. 23 is a partial cross-sectional schematic diagram of the box body disclosed in the second embodiment of the present application.

[0085] In the drawings, the drawings are not drawn to scale.

[0086] Marking instructions: 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; 10-end plate; 20-frame; 201-first extension part; 202-second extension part; 203-first limiting part; 204-second limiting part; 30-connecting piece; 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.

[0087] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0088] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present 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 vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0089] 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.

[0090] With the vigorous promotion of new energy vehicles, power batteries, as a rechargeable battery, are the power source of new energy vehicles and are widely used in the field of new energy vehicles. In some related technologies, the battery includes a box assembly and a battery cell. The box assembly includes a first box and a second box, and the battery cell is accommodated in a closed chamber formed by the first box and the second box being buckled. At least one of the first box and the second box includes an end plate and a frame. In order to achieve the connection between the end plate and the frame, the end plate includes more parts and the connection structure with the frame is complex.

[0091] Based on this, some embodiments of the present application provide an assembly method of an end plate, a box, a battery, an electrical device and a box, so as to alleviate the problem of complex end plate structure.

[0092] 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 electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0093] 1 , the electric 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.

[0094] The vehicle 200 includes an axle 200a, a wheel 200b, a motor 200c, a controller 200d and a battery 100. The wheel 200b is connected to the axle 200a, the motor 200c is used to drive the axle 200a to rotate, the controller 200d is used to control the operation of the motor 200c, and the battery 100 can be arranged at the bottom, head or tail of the vehicle 200 to provide electrical energy for the operation of the motor 200c and other components in the vehicle.

[0095] Referring to FIG. 2 , the battery 100 includes a box assembly 101 and at least one battery cell 102. The at least one battery cell 102 includes more than two battery cells 102, and the multiple battery cells 102 can be connected in series, in parallel, or in mixed connection. Mixed connection refers to a mixture of series and parallel connection. The box assembly 101 is a hollow structure inside, and the at least one battery cell 102 is accommodated in the box assembly 101.

[0096] 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, in series or in a mixed combination and are placed in a closed chamber formed by the first box 101a and the second box 101b being buckled together.

[0097] At least one of the first box body 101 a and the second box body 101 b includes an end plate 10 .

[0098] 3 to 5 , some embodiments of the present application provide an end plate 10 , which includes a first plate 1 and a second plate 2 .

[0099] The first plate 1 comprises a first connection portion 11 , which is arranged in a closed loop along a circumferential edge of the first plate 1 , and the first connection portion 11 is configured to form a continuous sealed connection with an environmental component.

[0100] The second plate 2 is stacked with the first plate 1 along the first direction X. The second plate 2 includes second connection portions 21 spaced apart along the circumferential edge of the second plate 2 . The second connection portions 21 are configured to be connected to the environmental component through the connection member 30 .

[0101] In the above embodiment, the end plate 10 includes a first plate 1 and a second plate 2 which are stacked. The first connection portion 11 of the first plate 1 forms a continuous sealing connection with the environmental component, which is used to achieve the sealing of the connection between the end plate 10 and the environmental component. The second connection portion 21 of the second plate 2 is connected to the environmental component through a connector 30, which is used to improve the connection strength between the end plate 10 and the environmental component. The end plate 10 has a small number of parts, a simple structure, and is easy to connect with the environmental component, with low cost and high reliability.

[0102] In some embodiments, the first plate 1 comprises an aluminum plate.

[0103] In some embodiments, the second plate 2 includes a steel plate or an aluminum plate.

[0104] In some embodiments, the first connection portion 11 and the second connection portion 21 are not on the same plane.

[0105] In the above embodiment, the first connection portion 11 and the second connection portion 21 are not on the same plane, and when one of the first connection portion 11 and the second connection portion 21 is connected, the other of the first connection portion 11 and the second connection portion 21 will not be affected.

[0106] 6 and 7 , 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.

[0107] In the above embodiment, an intermediate member 3 is disposed 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.

[0108] In some embodiments, the intermediate member 3 is constructed as a honeycomb structure.

[0109] In the above embodiment, a middle piece 3 with a honeycomb structure is arranged 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.

[0110] 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.

[0111] 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 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.

[0112] In some embodiments, the middle piece 3 is made of aluminum material to form 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 brazing with aluminum alloy.

[0113] In some embodiments, the first plate 1 is made of an aluminum plate, the second plate 2 is made of a steel plate, and the middle piece 3 is made of a PP honeycomb structure. The aluminum plate, the PP honeycomb structure and the steel plate are crimped into a whole to form an end plate 10 .

[0114] 8 , the end plate 10 further includes a middle piece 3, which forms at least one flow channel 4 between the first plate 1 and the second plate 2. The extension direction of the flow channel 4 intersects with the first direction X, and the first direction X is parallel to the direction from the first plate 1 to the second plate 2.

[0115] In the above embodiment, the middle piece 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 against the end plate 10, but also provide a buffering effect through the middle piece 3 to improve the ability of the end plate 10 to withstand impact.

[0116] In some embodiments, the extension direction of the flow channel 4 is perpendicular to the first direction X.

[0117] 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, and the second direction Y is perpendicular to the third direction Z.

[0118] Referring to FIG8 , the end plate 10 further includes an intermediate member 3 disposed between the first plate 1 and the second plate 2. The intermediate member 3 includes a first component 31 and a second component 32. The first component 31 is configured as a honeycomb structure. The second component 32 forms at least one flow channel 4 between the first component 31 and the first plate 1. Alternatively, the second component 32 forms at least one flow channel 4 between the first component 31 and the second plate 2. The extension direction of the flow channel 4 intersects with the first direction X, and the first direction X is parallel to the direction from the first plate 1 to the second plate 2.

[0119] In the above embodiment, the middle member 3 includes a first component 31 and a second component 32. The first component 31 is constructed as a honeycomb structure, which can provide a buffering effect and improve the ability of the end plate 10 to withstand impact. The second component 32 forms at least one flow channel 4 between the first plate 1 and the second plate 2, which can not only transport cooling liquid through the flow channel 4 to reduce the temperature of the end plate 10 and other components abutting against the end plate 10, but also provide a buffering effect through the second component 32 to improve the ability of the end plate 10 to withstand impact.

[0120] 9 , in some embodiments, the honeycomb structure includes a first honeycomb structure 33 , and the first honeycomb structure 33 is a hexagonal honeycomb structure.

[0121] 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.

[0122] Of course, the honeycomb structure is not limited to the hexagonal honeycomb structure and the circular honeycomb structure.

[0123] 4 , 5 , 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.

[0124] 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 .

[0125] In the above embodiment, the circumferential edge of the second plate 2 exceeds the circumferential edge of the first plate 1, so as to realize a continuous sealed connection between the first connection portion 11 at the circumferential edge of the first plate 1 and the environmental component, and the second connection portion 21 arranged at the circumferential edge of the second plate 2 is connected to the environmental component through a connector 30.

[0126] 4 and 5 , in some embodiments, the projection range of the first connection portion 11 in the first direction X covers and exceeds the projection range of the middle piece 3 in the first direction X.

[0127] 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, and the first direction X is parallel to the direction from the first plate 1 to the second plate 2 .

[0128] In the above embodiment, the circumferential edge of the first plate 1 exceeds the circumferential edge of the middle piece 3, so as to realize first assembling the first plate 1, the middle piece 3 and the second plate 2, and then inserting the extension portion of the environmental component between the first plate 1 and the second plate 2, so as to realize a continuous sealed connection between the first plate 1 and the environmental component from the side of the first plate 1 facing away from the second plate 2.

[0129] 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 connection portion 11 in the first direction X.

[0130] The projection of the intermediate member 3 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 .

[0131] In the above embodiment, the circumferential edge of the middle piece 3 exceeds the circumferential edge of the first plate 1, so as to realize a continuous sealed connection between the first plate 1 and the environmental component 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.

[0132] 6 to 8 , some embodiments further provide a box body, which includes an end plate 10 and a frame 20 provided according to any of the above embodiments. The frame 20 is an environmental component.

[0133] In some embodiments, the frame 20 includes a circumferential side wall, and the circumferential side wall encloses a cavity. For example, the frame 20 includes four side walls connected in sequence.

[0134] The end plate 10 includes a first plate 1 and a second plate 2 which are stacked.

[0135] The first plate 1 includes a first connection portion 11 , which is arranged in a closed loop along the circumferential edge of the first plate 1 , and the first connection portion 11 is continuously sealedly connected to the frame 20 .

[0136] The second plate 2 includes a second connection portion 21 disposed along a circumferential edge of the second plate 2 , and the second connection portion 21 is connected to the frame 20 via a connection member 30 .

[0137] In the above embodiment, the end plate 10 includes a first plate 1 and a second plate 2 which are stacked. The first connection portion 11 of the first plate 1 forms a continuous sealing connection with the frame 20, which is used to achieve the sealing of the connection between the end plate 10 and the frame 20. The second connection portion 21 of the second plate 2 is connected to the frame 20 through a connector 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 in cost, and high in reliability.

[0138] In some embodiments, the first connection portion 11 is closer to the inner space of the box than the second connection portion 21 .

[0139] In the above embodiment, the first connection portion 11 is closer to the inner space of the box than the second connection portion 21 , and when one of the first connection portion 11 and the second connection portion 21 is connected, the other of the first connection portion 11 and the second connection portion 21 will not be affected.

[0140] In some embodiments, the first connection portion 11 and the frame 20 are continuously sealed and connected by friction stir welding (FSW).

[0141] 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.

[0142] In the above embodiment, the friction stir welding belongs to solid phase welding. Of course, the first connection portion 11 and the frame 20 are not limited to solid phase welding, and can also form a continuous sealed connection by melting welding or brazing.

[0143] In some embodiments, the housing further comprises a connector 30, and the connector 30 comprises a hot melt self-tapping screw (FDS).

[0144] 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.

[0145] In some embodiments, the connecting member 30 includes a bolt, a screw, a connecting pin, or the like.

[0146] Referring to Figures 6 to 8, 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; 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.

[0147] In the above embodiment, the frame 20 is arranged on a side of the second plate 2 adjacent to the first plate 1, the second plate 2 covers the frame 20, the frame 20 is arranged around the circumferential outer edge of the first plate 1, and 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; the first connection portion 11 at the circumferential edge of the first plate 1 is used to form a continuous sealed connection with the frame 20, so that the frame 20 and the end plate 10 can form a sealed connection, so that the cavity enclosed by the frame 20 is sealed at the end plate 10; at least two connecting members 30 spaced apart at 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.

[0148] Referring to Figure 6, 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; 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.

[0149] 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, and is used to first assemble the first plate 1, the middle piece 3 and the second plate 2 into the end plate 10, and then insert the first extension portion 201 of the frame 20 between the first plate 1 and the second plate 2, and then form a continuous sealed connection between the first connecting portion 11 and the first extension portion 201 of the frame 20 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 support the welding of the first plate 1.

[0150] In some embodiments, 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 .

[0151] 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 achieving a continuous sealed connection between the first plate 1 and the frame 20.

[0152] In some embodiments, the frame 20 further includes a first limiting portion 203 , which is disposed on a side of the first extending portion 201 away from the second plate 2 , and the first limiting portion 203 abuts against a circumferential outer edge of the first plate 1 .

[0153] In the above embodiment, the first limiting portion 203 abuts against the circumferential outer edge of the first plate 1 , which can position the first plate 1 and is used to achieve a continuous sealed connection between the first plate 1 and the first limiting portion 203 and the first extending portion 201 .

[0154] 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.

[0155] 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 .

[0156] 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, so that a flat bottom structure can be formed in the box.

[0157] In some embodiments, a projection of the first plate 1 in the first direction X covers and exceeds a projection of the middle member 3 in the first direction X, and the first direction X is parallel to a direction from the first plate 1 to the second plate 2 .

[0158] In the above embodiment, the circumferential edge of the first plate 1 exceeds the circumferential edge of the middle piece 3 , so that the first extension portion 201 extends between the first plate 1 and the second plate 2 .

[0159] In some embodiments, the first extension portion 201 abuts against the circumferential outer edge of the middle piece 3 .

[0160] Referring to Figures 7 and 8, in other 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; 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.

[0161] 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.

[0162] In the above embodiment, the first plate 1 is first supported by the second extension portion 202, the first connection portion 11 is continuously sealed and connected with 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 with the end plate 10 and also to support the welding of the first plate 1.

[0163] In some embodiments, the second extension portion 202 is adjacent to one side of the second plate 2 and forms a continuous sealed connection with the first connection portion 11 .

[0164] 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.

[0165] In some embodiments, the frame 20 further includes a second limiting portion 204 , which is disposed on a side of the second extending portion 202 adjacent to the second plate 2 , and the second limiting portion 204 abuts against a circumferential outer edge of the first plate 1 .

[0166] 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 .

[0167] 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 .

[0168] In the above embodiment, the second limiting portion 204 is used to limit the first plate 1 .

[0169] 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.

[0170] 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 achieve the second plate 2 covering the frame 20 and achieving connection with the frame 20.

[0171] Some embodiments of the present application further provide a battery 100, comprising the box body in any of the above embodiments.

[0172] The box body may be at least one of the first box body 101a and the second box body 101b.

[0173] In some embodiments, the battery 100 further includes at least one battery cell 102. The at least one battery cell 102 includes more than two battery cells 102, and the multiple battery cells 102 can be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series connection and parallel connection.

[0174] In some embodiments, the battery 100 includes a first box body 101a and a second box body 101b. A plurality of battery cells 102 are connected in parallel, in series or in a mixed combination and placed in a closed chamber formed by the first box body 101a and the second box body 101b being buckled together.

[0175] 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 correspondingly has the beneficial effects of the box body.

[0176] Some embodiments of the present application further provide an electrical device, which includes the battery 100 in any of the above embodiments.

[0177] The electrical device includes the battery 100 in any of the above embodiments, and correspondingly has the beneficial effects of the battery 100.

[0178] In some embodiments, the electric device comprises a vehicle.

[0179] Some embodiments of the present application also provide a method for assembling a box, which comprises the following steps:

[0180] providing a frame 20; and

[0181] An end plate 10 is provided, the end plate 10 comprises a first plate 1 and a second plate 2 stacked along a first direction X, the first plate 1 comprises a first connection portion 11 arranged in a closed loop along a circumferential edge of the first plate 1, and the second plate 2 comprises a second connection portion 21 arranged at intervals along a circumferential edge of the second plate 2;

[0182] The entire circumferential edge of at least one of the first connection portion 11 and the second connection portion 21 is continuously and sealably connected to the frame 20 .

[0183] 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, which has a simple structure, convenient installation, high assembly efficiency, low cost and good reliability.

[0184] In some embodiments, the first connection portion 11 is closer to the inner space of the box body than the second connection portion 21;

[0185] Continuously sealingly connecting the entire circumferential edge of at least one of the first connection part 11 and the second connection part 21 to the frame 20 includes: continuously sealingly connecting the entire circumferential edge of the first connection part 11 to the frame 20, and connecting the circumferential edge of the second connection part 21 to the frame 20 through at least two connecting members 30.

[0186] In the above embodiment, the first connection portion 11 forms a continuous sealing connection with the frame 20, which is used to achieve sealing at the connection between the end plate 10 and the frame 20, and the second connection portion 21 is connected to the frame 20 through at least two connecting members 30, respectively, which is used to improve the connection strength between the end plate 10 and the frame 20. The end plate 10 has fewer parts and a simple structure, and the connection operation between the end plate 10 and the frame 20 is convenient, low in cost, and high in reliability.

[0187] In some embodiments, before the circumferential edge of the first connection portion 11 and the circumferential edge of the second connection portion 21 are connected to the frame 20, the assembly method further includes:

[0188] 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;

[0189] 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:

[0190] The entire circumferential edge of the first connecting portion 11 is continuously sealed to the first extending portion 201; and

[0191] The peripheral edge of the second connecting portion 21 is connected to the frame 20 via at least two connecting members 30 .

[0192] 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 and fastening method has a simple structure, convenient installation, high assembly efficiency, low cost and good reliability.

[0193] In some embodiments, providing the frame 20 includes: placing the frame 20 so that an end portion of the frame 20 connected to the end plate 10 is located above the cavity enclosed by the frame 20;

[0194] 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, comprising: placing the first plate 1 in the end of the frame 20 and supported by the second extension portion 202 on the frame 20; the entire circumferential edge of the first connection portion 11 is continuously sealed to the second extension portion 202; and

[0195] The second plate 2 is disposed on a side of the first plate 1 facing away from the frame 20 , the second plate 2 covers the frame 20 , and the second connecting portion 21 is connected to the frame 20 through at least two connecting members 30 .

[0196] In the above embodiment, the first plate 1 of the end plate 10 is firstly 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 connected to the frame 20 to form a box structure with few parts and a simple structure. The upper and lower double connection and fastening method has a simple structure, convenient installation, high assembly efficiency, low cost and high reliability.

[0197] In the above embodiment, the end plate 10 includes a first plate 1 and a second plate 2 which are stacked. The first connection portion 11 of the first plate 1 forms a continuous sealing connection with the frame 20, which is used to achieve the sealing of the connection between the end plate 10 and the frame 20. The second connection portion 21 of the second plate 2 is connected to the frame 20 through 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 few parts and a simple structure. The connection operation between the end plate 10 and the frame 20 is convenient, low in cost, and high in reliability.

[0198] The present application provides two methods for assembling the box, which are described below in conjunction with Figures 13 to 23.

[0199] With reference to FIGS. 13 to 16 , some embodiments provide a method for assembling a box, which includes the following steps:

[0200] 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 which are stacked;

[0201] Referring to FIG. 14 , a 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 a first extension portion 201 on the frame 20 extends between the first plate 1 and the second plate 2 (refer to FIG. 6 ); the circumferential edge of the first plate 1 is continuously sealed to the first extension portion 201 ; and

[0202] 15 , the peripheral edge of the second plate 2 is connected to the frame 20 via at least two connecting members 30 .

[0203] 16 is a schematic diagram of the box after assembly, the circumferential edge of the first plate 1 is continuously sealed 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 .

[0204] 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 and fastening method has a simple structure, convenient installation, high assembly efficiency, low cost and good reliability.

[0205] Referring to FIGS. 17 to 23 , some other embodiments provide a method for assembling a box, which includes the following steps:

[0206] 18 , the frame 20 is placed so that the end of the frame 20 is located above the cavity enclosed by the frame 20;

[0207] Referring to FIG. 19 , the first plate 1 is placed inside the end of the frame 20 and supported by the second extension portion 202 on the frame 20 ; the circumferential edge of the first plate 1 is continuously sealed and connected to the second extension portion 202 ;

[0208] 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 .

[0209] 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 .

[0210] In the above embodiment, the first plate 1 of the end plate 10 is firstly 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 connected to the frame 20 to form a box structure with few parts and a simple structure. The upper and lower double connection and fastening method has a simple structure, convenient installation, high assembly efficiency, low cost and high reliability.

[0211] It should be noted that the weld 40 shown in Figures 13, 17 and 18 may be formed after the first plate 1 and the frame 20 are welded. The weld 40 is illustrated separately in order to clearly show the various components of the box.

[0212] Two embodiments of the end plate 10 and two assembly methods of the box are listed below.

[0213] First embodiment: Referring to FIG. 3 to FIG. 5 , the end plate 10 includes a first plate 1 , a middle member 3 , and a second plate 2 which are stacked.

[0214] 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.

[0215] The first plate 1 is an aluminum plate and has a thickness ranging from 1.5 mm to 2.5 mm.

[0216] 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 is in the range of 0.5 mm to 1.5 mm. The second plate 2 is an aluminum plate, and the thickness of the second plate 2 is in the range of 1 mm to 2 mm.

[0217] 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 a honeycomb aluminum panel. When the middle piece 3 is a honeycomb aluminum panel, the first plate 1, the second plate 2 and the middle piece 3 are integrated by aluminum alloy brazing to form an end plate 10 with a three-layer structure having good rigidity and high strength. When the middle piece 3 is a honeycomb plastic, a 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 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.

[0218] 5 , 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, and the dimension L1 of the second plate 2 exceeding the first plate 1 ranges from 10 mm to 50 mm.

[0219] 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:

[0220] 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 which are stacked;

[0221] 6 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 arranged around the circumferential outer edge of the first plate 1, and a first extension portion 201 on the frame 20 extends between the first plate 1 and the second plate 2 and abuts against the middle member 3; the circumferential edge of the first plate 1 and the first extension portion 201 are continuously sealed and connected by friction stir welding (FSW); and

[0222] 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).

[0223] 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).

[0224] In the first embodiment, the end plate 10 is manufactured first and then connected to the frame 20. The end plate 10 can be used 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.

[0225] The FSW and FDS connection methods are used to connect the end plate 10 and the frame 20 together to form a box structure with few parts and a simple structure. The upper and lower double connection fastening methods have a simple structure, convenient installation, high assembly efficiency, low cost, and good reliability; it can be widely promoted and used, and has a high market value.

[0226] The FSW weld in the first embodiment 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. Since the weld is close to the circumferential side wall 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 special friction stir welding head equipment needs to be customized. In this case, the end plate 10 provided in the second embodiment below and the second assembly method of the box can be used.

[0227] Second embodiment: with reference to FIG. 3 , 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.

[0228] 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.

[0229] The first plate 1 is an aluminum plate and has a thickness ranging from 1.5 mm to 2.5 mm.

[0230] 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 is in the range of 0.5 mm to 1.5 mm. The second plate 2 is an aluminum plate, and the thickness of the second plate 2 is in the range of 1 mm to 2 mm.

[0231] 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 a honeycomb aluminum panel. When the middle piece 3 is a honeycomb aluminum panel, the first plate 1, the second plate 2 and the middle piece 3 are integrated by aluminum alloy brazing to form an end plate 10 with a three-layer structure having good rigidity and high strength. When the middle piece 3 is a honeycomb plastic, a 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 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 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.

[0232] 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, and the dimension L2 of the second plate 2 exceeding the first plate 1 ranges from 25 mm to 60 mm.

[0233] 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:

[0234] 18 , the frame 20 is placed so that the end of the frame 20 is located above the cavity enclosed by the frame 20 .

[0235] 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 that only includes the end plate 10. Specifically, the first plate 1 is placed in the end of the frame 20 and supported by the second extension portion 202 on the frame 20; the circumferential edge of the first plate 1 and the second extension portion 202 are continuously sealed and connected by stir friction welding (FSW).

[0236] 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.

[0237] Referring to FIG. 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.

[0238] 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).

[0239] 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, and 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 second plate 2 is connected to the frame 20 by the FDS connection method to form a box structure with few parts and a simple structure. In summary, this box structure has few parts, a double connection and fastening method of the upper and lower parts, a simple structure, easy installation, high assembly efficiency, low cost and high reliability. It can be promoted and used in large quantities and has a high market value.

[0240] 6 , which is a first embodiment of a box body, the box body includes the end plate 10 provided in the first embodiment and is formed by using a first assembly method of the box body.

[0241] 7 , which is a second embodiment of a box body, the box body includes the end plate 10 provided in the second embodiment and is formed by a second assembly method of the box body.

[0242] Referring to Fig. 8, a third embodiment of the box body is shown, the end plate 10 included in the box body is different from the middle piece 3 of the end plate 10 provided in the second embodiment, and the other structures are the same. The second assembly method of the box body is used to form the box body.

[0243] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned 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 includes all technical solutions falling within the scope of the claims.

Claims

An end plate (10) comprising: A first plate (1) comprises a first connection portion (11), the first connection portion (11) being arranged in a closed loop along a circumferential edge of the first plate (1) and being configured to form a continuous sealed connection with an environmental component; and a second plate (2) being arranged in a stacked manner with the first plate (1) along a first direction (X); the second plate (2) comprises a second connection portion (21) being arranged at intervals along a circumferential edge of the second plate (2), the second connection portion (21) being configured to be connected to the environmental component via a connector (30). The end plate (10) according to claim 1, wherein the first connecting portion (11) and the second connecting portion (21) are not on the same plane. The end plate (10) according to claim 1 or 2, 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). The end plate (10) according to claim 3, wherein the intermediate member (3) is constructed as a honeycomb structure. According to the end plate (10) according to claim 3 or 4, the intermediate member (3) forms at least one flow channel (4) between the first plate (1) and the second plate (2), and the extension direction of the flow channel (4) intersects with the first direction (X). The end plate (10) according to claim 3, wherein the intermediate member (3) comprises a first component (31) and a second component (32), the first component (31) being constructed as a honeycomb structure, the second component (32) forming at least one flow channel (4) between the first component (31) and the first plate (1) or the second plate (2), and the extension direction of the flow channel (4) intersects with the first direction (X). According to any one of claims 1 to 6, the end plate (10) 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). According to any one of claims 2 to 6, the end plate (10) 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). According to the end plate (10) according to any one of claims 2 to 6 and 8, 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). A box body, comprising: The end plate (10) according to any one of claims 1 to 9; And a frame (20) is the environmental component. The box body according to claim 10, wherein the first connecting portion (11) is closer to the internal space of the box body than the second connecting portion (21). The box body according to claim 10 or 11, wherein the first connecting portion (11) and the frame (20) are continuously sealed by friction stir welding. The box body according to any one of claims 10 to 12, further comprising the connecting member (30), wherein the connecting member (30) comprises a hot-melt self-tapping screw. The box body according to any one of claims 10 to 13, 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). The box body according to claim 14, 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). The box body according to claim 15, wherein a side of the first extension portion (201) facing away from the second plate (2) forms a continuous sealed connection with the first connecting portion (11). According to the box body according to claim 15 or 16, the frame (20) further includes a first limiting portion (203), the first limiting portion (203) is arranged on a side of the first extension portion (201) away from the second plate (2), and the first limiting portion (203) abuts against the circumferential outer edge of the first plate (1). The box body according to claim 17, 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). The box body according to claim 14, 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 a 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). The box body according to claim 19, wherein 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). According to the box body according to claim 19 or 20, the frame (20) further includes a second limiting portion (204), the second limiting portion (204) is arranged on a side of the second extension portion (202) adjacent to the second plate (2), and the second limiting portion (204) abuts against the circumferential outer edge of the first plate (1). The box body according to claim 21, 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). A battery comprising the casing according to any one of claims 1 to 22. An electrical device comprising the battery according to claim 23. A method for assembling a box body comprises the following steps: providing a border (20); And providing an end plate (10), wherein the end plate (10) comprises the first plate (1) and the second plate (2) stacked along a first direction (X), the first plate (1) comprising a first connecting portion (11) arranged in a closed loop along the circumferential edge of the first plate (1), and the second plate (2) comprising a second connecting portion (21) arranged at intervals along the circumferential edge of 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 sealed and connected to the frame (20). The assembly method according to claim 25, 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 sealing and 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) comprises: 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). The method for assembling a box according to claim 25 or 26, 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: placing the frame (20) on a side of the second plate (2) adjacent to the first plate (1), the frame (20) being arranged around the circumferential outer edge of the first plate (1), and the first extension portion (201) on the frame (20) extending between the first plate (1) and the second plate (2); the step of 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) comprises: forming a continuous sealing connection between the entire circumferential edge of the first connecting portion (11) and the first extension portion (201); and connecting the circumferential edge of the second connecting portion (21) to the frame (20) via at least two connecting members (30). The method for assembling a box as claimed in claim 25, wherein: The provision of 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 continuous sealing connection of 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 a first plate (1) inside the end of the frame (20) and supporting it through a second extension portion (202) on the frame (20); forming a continuous sealing connection between the entire circumferential edge of the first connecting portion (11) and the second extension portion (202); and arranging a second plate (2) on a side of the first plate (1) facing away from the frame (20), the second plate (2) covering the frame (20), and connecting the second connecting portion (21) to the frame (20) through at least two connecting members (30).

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