Case, battery and electric device

Abstract

A case (100), a battery (1100), and an electric device. The case (100) comprises an annular frame (10) and a plate member (20); the annular frame (10) is enclosed to form an accommodating cavity (101), and an opening on at least one side of the accommodating cavity (101) is covered with the plate member (20), wherein the annular frame (10) is formed by bending a frame strip (111), and one end of the frame strip (111) is hermetically connected to the other end of the frame strip (111).

Description

Box, battery and electrical device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 6, 2024, with application number 202410257004.1 and invention name “Box, Battery and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the technical field of battery boxes, and in particular relates to a box, a battery and an electrical device. Background Art

[0003] Batteries are widely used in a variety of electronic devices, including mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy planes, and power tools. Batteries are devices that can store and release electrical energy, providing the power required by these electronic devices.

[0004] A battery generally includes a box and battery cells. The battery cells are installed in the box. The box protects the battery cells, but the sealing performance of the box is poor.

[0005] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art.

[0006] Application Contents

[0007] The purpose of the embodiments of the present application is to provide a box, a battery and an electrical device that are conducive to improving the sealing performance.

[0008] The technical solution adopted in the embodiment of this application is:

[0009] In a first aspect, a box is provided, which includes an annular frame and a plate, wherein the annular frame is surrounded to form a receiving cavity; at least one side opening of the receiving cavity is covered with the plate; wherein the annular frame is formed by bending a frame bar, and one end of the frame bar is sealed and connected to the other end of the frame bar.

[0010] The box body of the embodiment of the present application has an annular frame formed by bending a frame bar, and one end of the frame bar is sealed with the other end of the frame bar, so that a sealed connection of the annular frame can be achieved. In addition, this method allows the annular frame to have a sealed connection position, and the number of sealed connection positions is small, which is beneficial to improving the sealing performance of the box body and also beneficial to improving the reliability of battery use.

[0011] In one embodiment, the border strips are roll bent to form an annular frame.

[0012] By adopting the technical solution of this embodiment, the border strip is bent by roller bending to obtain an annular frame. The roller bending operation is efficient and has high bending precision. The production operation of the annular frame is simple and the cost is low. In addition, during the roller bending process, the internal structure and strength of the border strip remain basically unchanged. Therefore, roller bending can achieve bending of the desired shape without reducing the performance of the border strip, which is beneficial to improving the structural strength of the box and improving the reliability of the battery.

[0013] In one embodiment, one end of the frame bar is welded to the other end of the frame bar.

[0014] By adopting the technical solution of this embodiment, the two ends of the frame strip are sealed and connected by welding. After welding, the sealing performance between the two ends of the frame strip is good, which is beneficial to improving the sealing performance of the box. In addition, the welding operation is simple, which is beneficial to improving the production efficiency of the box and reducing the production cost of the box.

[0015] In one embodiment, the annular frame includes a plurality of straight segments and a plurality of arc segments. The plurality of straight segments are arranged around the receiving cavity, and an arc segment is connected between two adjacent straight segments.

[0016] By adopting the technical solution of this embodiment, two adjacent straight line segments are smoothly transitioned through the arc segment, which is beneficial to reducing stress concentration, improving the structural strength of the annular frame, and improving the structural strength of the box.

[0017] In one embodiment, the arc segment is a circular arc segment.

[0018] By adopting the technical solution of this embodiment, the two straight line segments are smoothly connected by the arc segment, the risk of stress concentration at the connection is smaller, the structural strength is better, and it is more conducive to improving the structural strength of the box; and the bending operation of the arc segment is simple, which is conducive to reducing production costs.

[0019] In one embodiment, the radius of the inner wall surface of the arc segment is R, wherein 40 mm ≤ R ≤ 200 mm.

[0020] By adopting the technical solution of this embodiment, the radius of the inner wall surface of the arc segment is reasonably set, which can take into account both the production of the annular frame and the energy density of the battery.

[0021] In one embodiment, 60 mm ≤ R ≤ 120 mm.

[0022] By adopting the technical solution of this embodiment, the radius of the inner wall surface of the arc segment is set more reasonably, which can better take into account both the production of the annular frame and the energy density of the battery.

[0023] In one embodiment, the frame strip is hollow inside and encloses one or more hollow cavities.

[0024] By adopting the technical solution of this embodiment, the frame bar has a hollow structure, the structural strength of the frame bar is good, the structural strength of the annular frame is good, and the structural strength of the box body is good, which is beneficial to improving the reliability of battery use; in addition, the setting of the hollow cavity is also beneficial to reducing material accumulation and reducing the production cost of the box body.

[0025] In one embodiment, the frame strip comprises a bent plate, and the bent plate is bent to form a hollow cavity.

[0026] By adopting the technical solution of this embodiment, the frame strips are formed by bending the bending plate, and the manufacturing method of the frame strips is simple, which is conducive to reducing the manufacturing cost of the box.

[0027] In one embodiment, the bent sheet is roll bent to form the hollow cavity.

[0028] By adopting the technical solution of this embodiment, the frame strips are formed by roller bending the bent plate. The production method of the frame strips is simple, which is beneficial to reducing the production cost of the box; the frame strips made by roller bending have good structural strength, which is beneficial to improving the structural strength of the box.

[0029] In one embodiment, the bending plate includes a bending starting portion, a bending portion and a bending ending portion that are connected to each other, and the bending starting portion is fixedly connected to the bending ending portion; or, the bending starting portion is fixedly connected to the bending portion; or, the bending ending portion is fixedly connected to the bending portion.

[0030] By adopting the technical solution of this embodiment, the bending plates can be restricted from spreading out, so that the frame strips can maintain a hollow shape, which is beneficial to improving the structural strength of the box.

[0031] In one embodiment, when the bending start portion is connected to the bending end portion, the bending start portion and the bending end portion are fixedly connected; or, the bending start portion and the bending end portion are fixedly connected.

[0032] By adopting the technical solution of this embodiment, the connection between the bending start portion and the bending end portion can be flexibly set to meet the use requirements of frame strips of different shapes.

[0033] In one embodiment, the annular frame includes an annular body and a first connecting portion connected to the annular body. The annular body is arranged to form a receiving cavity. The first connecting portion is located on the side of the annular body facing away from the receiving cavity. The edge of the plate is covered on the end of the first connecting portion away from the annular body.

[0034] By adopting the technical solution of this embodiment, the edge of the plate is wrapped around the end of the first connecting part away from the annular body, so that the edge of the plate covers the end face of the first connecting part away from the annular body, reducing the exposure of the end face of the first connecting part away from the annular body, reducing the risk of corrosion of the end face of the first connecting part away from the annular body, and helping to improve the reliability and service life of the border strip.

[0035] In one embodiment, the edge of the plate is bent to form a first main body portion and a first flange portion, and the end of the first connecting portion away from the annular body is located between the first main body portion and the first flange portion.

[0036] By adopting the technical solution of this embodiment, the edge of the plate can be bent to wrap the end of the first connecting part away from the annular body. The edging operation is simple, which is conducive to simplifying the assembly operation of the box and also helps to reduce the production cost of the box.

[0037] In one embodiment, the box body also includes a seal, one side of which overlaps the surface of the first flange portion facing away from the first main body portion; the other side of the seal overlaps at least one of the surface of the annular body facing away from the accommodating cavity and the surface of the first connecting portion facing away from the first main body portion.

[0038] By adopting the technical solution of this embodiment, the seal can seal the gap between the first flange portion and the first connecting portion, which is beneficial to improving the sealing performance of the plate and the annular frame, and improving the sealing performance of the box. In addition, the seal can also separate the end face of the first flange portion from the external environment, reducing the risk of corrosion of the end face of the first flange portion, which is beneficial to improving the reliability and service life of the plate.

[0039] In one embodiment, the annular frame includes an annular body and a second connecting portion connected to the annular body. The annular body is arranged to form a receiving cavity. The second connecting portion is located on the side of the annular body facing the receiving cavity. The edge of the plate is connected to the second connecting portion.

[0040] By adopting the technical solution of this embodiment, the second connecting part is located on the side of the annular body facing the accommodating cavity and is connected to the second connecting part, that is, the plate is connected to the inner side of the annular frame, which can reduce the external dimensions of the box and improve the volume energy density of the battery.

[0041] In one embodiment, an edge of the plate abuts against a surface of the second connecting portion facing the receiving cavity.

[0042] By adopting the technical solution of this embodiment, the battery cell is placed in the receiving cavity, the plate supports the battery cell, and the edge of the plate abuts against the surface of the second connecting part facing the receiving cavity, so that the second connecting part can support the plate and reduce the force on the connecting structure between the plate and the second connecting part. The connection reliability of the plate and the second connecting part is good, and the structural strength of the box is good, which is conducive to improving the reliability of the battery.

[0043] In one embodiment, the annular frame is an annular steel frame, the plate member includes a first steel-aluminum composite plate, the first steel-aluminum composite plate includes a first steel plate layer and a first aluminum plate layer stacked together, and the first steel plate layer is welded to the annular steel frame.

[0044] By adopting the technical solution of this embodiment, since the first steel plate layer of the first steel-aluminum composite plate in the panel of the box and the steel frame are both made of steel material, the first steel plate layer can be welded to the steel frame. This makes it possible to reduce the use of bolts in the connection between the panel and the steel frame, or even eliminate bolts, thereby reducing the number of parts of the box and improving the assembly efficiency of the box.

[0045] In one embodiment, the first steel plate layer includes a covering area and an uncovered area connected to the covering area, the first aluminum plate layer covers the covering area, and the uncovered area is welded to the annular steel frame.

[0046] By adopting the technical solution of this embodiment, an uncovered area is provided on the first steel-aluminum composite plate, so that the first steel plate layer in the uncovered area is exposed, which facilitates welding of the first steel-aluminum composite plate and the annular steel frame.

[0047] In one embodiment, the edge of the first steel-aluminum composite plate is bent toward the first aluminum plate layer so that the first steel-aluminum composite plate forms a second main body portion and a second flange portion; the first steel plate layer of the second flange portion is welded to the annular steel frame; and / or, the first steel plate layer of the second main body portion is welded to the annular steel frame.

[0048] By adopting the technical solution of this embodiment, after the edge of the first steel-aluminum composite plate is bent toward the first aluminum plate layer, the first steel plate layer is covered outside the first aluminum plate layer. The first steel plate layer can separate the annular steel frame and the first aluminum plate layer, thereby protecting the first aluminum plate layer and reducing the impact of the high temperature of welding the first steel plate layer to the annular steel frame on the first aluminum plate layer, which is conducive to reducing welding defects, improving welding quality, and improving the connection reliability of the first steel-aluminum composite plate and the annular steel frame.

[0049] In one embodiment, the included angle between the second flange portion and the second main body portion is α, wherein 90°≤α<180°.

[0050] By adopting the technical solution of this embodiment, the bending angle of the second flange portion relative to the second main body portion is small, and the bending difficulty of the first steel-aluminum composite plate is small, which is conducive to improving the production efficiency of the box.

[0051] In one embodiment, 90°≤α≤110°.

[0052] By adopting the technical solution of this embodiment, the design of 90°≤α≤110° allows the second flange portion and the second main body portion to be arranged vertically or nearly vertically, and the structure of the first steel-aluminum composite plate is regular, which facilitates the connection between the first steel plate layer and the annular steel frame.

[0053] In one embodiment, at least a portion of the second flange portion is inserted into the receiving cavity.

[0054] By adopting the technical solution of this embodiment, the second flange portion is located in the receiving cavity, which can reduce the size of the box body and help improve the volume energy density of the battery; in addition, the second flange portion is located in the receiving cavity, which also facilitates the welding of the first steel plate layer of the second flange portion and the annular steel frame.

[0055] In one embodiment, the first steel plate layer of the second flange portion abuts against the surface of the annular steel frame facing the receiving cavity.

[0056] By adopting the technical solution of this embodiment, the first steel plate layer of the second flange portion abuts against the surface of the annular steel frame facing the accommodating cavity, which is beneficial to improving the welding quality and welding reliability after welding and improving the structural reliability of the box.

[0057] In one embodiment, the included angle between the second flange portion and the second main body portion is α, wherein 0°≤α<90°.

[0058] By adopting the technical solution of this embodiment, the first steel plate layer can better cover the first aluminum plate layer, and the first steel plate layer provides better protection for the first aluminum plate layer, thereby reducing the impact of the high temperature of welding the first steel plate layer and the annular steel frame on the first aluminum plate layer, which is beneficial to improving the welding quality.

[0059] In one embodiment, 0°≤α≤10°.

[0060] By adopting the technical solution of this embodiment, the design of 0°≤α≤10° makes the second flange portion parallel or nearly parallel to the second main body portion, and the first aluminum plate layer is located within the double-layer structure formed by the bending of the first steel plate layer. In this way, even if the first steel plate layer is affected by the high temperature of welding, the first aluminum plate layer is still located between the two first steel plate layers after melting, so as to reduce welding defects and improve the connection reliability of the first steel-aluminum composite plate and the annular steel frame; in addition, the double-layer structure formed by the bending of the first steel plate layer is welded to the annular steel frame, so that the first steel-aluminum composite plate does not need to adopt a complicated process to peel off the first aluminum plate layer in the welding area, which simplifies the manufacturing process, is conducive to improving production efficiency and reducing production costs; at the same time, the first steel plate layer is bent to form a double-layer structure, which has good structural strength, is conducive to improving the connection strength between the first steel plate layer and the annular steel frame, and improving the overall strength and reliability of the box.

[0061] In one embodiment, the second flange portion abuts against the end surface of the annular steel frame facing the plate, or the second main body portion abuts against the end surface of the annular steel frame facing the plate.

[0062] By adopting the technical solution of this embodiment, the first steel plate layer can be welded to the annular steel frame from the outside of the box body. The welding operation is simple, which is conducive to improving the assembly efficiency of the box body. In addition, the welding method of the first steel plate composite plate and the annular steel frame can be flexibly set to meet different needs.

[0063] In one embodiment, the second flange portion includes a bending section and a flange section, the bending section is connected between the flange section and the second main body portion; the first steel plate layer of the bending section is welded to the annular steel frame.

[0064] By adopting the technical solution of this embodiment, the welding operation of the bending section and the annular steel frame is easy. In addition, the bending section also has a large welding area, which is conducive to improving the welding reliability of the first steel plate layer and the annular steel frame.

[0065] In one embodiment, the plate further includes a heat conducting plate, and the first steel-aluminum composite plate and the heat conducting plate are stacked and enclosed to form a heat exchange channel for the heat exchange medium to flow.

[0066] By adopting the technical solution of this embodiment, the plate has a thermal management function and can be used as a heat exchanger. The box body does not need to be equipped with an additional heat exchanger, which is beneficial to reducing the number of parts of the box body, improving assembly efficiency, and improving the integration of the battery. In addition, the battery cells can directly exchange heat with the plate, thereby improving the heat exchange effect.

[0067] In one embodiment, the thermally conductive plate includes at least one of an aluminum plate and a second steel-aluminum composite plate.

[0068] By adopting the technical solution of this embodiment, the panels can be flexibly arranged to meet different battery usage requirements.

[0069] In one embodiment, when the heat conducting plate includes an aluminum plate, the first aluminum plate layer is located between the aluminum plate and the first steel plate layer, and the aluminum plate is connected to the first aluminum plate layer; when the heat conducting plate includes a second steel-aluminum composite plate, the second steel-aluminum composite plate includes a second steel plate layer and a second aluminum plate layer stacked together, the first aluminum plate layer and the second aluminum plate layer are located between the first steel plate layer and the second steel plate layer, and the first aluminum plate layer and the second aluminum plate layer are connected.

[0070] By adopting the technical solution of this embodiment, the aluminum plate and the first aluminum plate layer are arranged close to each other, the materials of the aluminum plate and the first aluminum plate layer are the same or similar, the connection method between the first aluminum plate layer and the aluminum plate is simple, and the connection reliability is good; in addition, the first steel-aluminum composite plate and the second steel-aluminum composite plate are stacked, which can increase the structural strength of the plate to improve the structural strength of the battery; and the first aluminum plate layer and the second aluminum plate layer are located between the first steel plate layer and the second steel plate layer, which facilitates the welding of the first steel plate layer and the annular steel frame.

[0071] In one embodiment, when the heat conducting plate includes the second steel-aluminum composite plate, edges of the first steel-aluminum composite plate and the second steel-aluminum composite plate overlap to form an overlapping area, which is welded to the annular steel frame.

[0072] By adopting the technical solution of this embodiment, the first aluminum plate layer and the second aluminum plate layer in the overlap area are located between the first steel plate layer and the second steel plate layer. In this way, even if the first steel plate layer and the annular steel frame are welded using a welding method with a higher welding temperature, the first aluminum plate layer and the second aluminum plate layer can still be located between the first steel plate layer and the second steel plate layer after melting, thereby reducing welding defects and improving welding reliability.

[0073] In one embodiment, an edge of the first steel-aluminum composite plate protrudes from the heat conducting plate to form a protruding portion, and the first steel plate layer of the protruding portion is connected to the annular steel frame.

[0074] By adopting the technical solution of this embodiment, the first steel plate layer of the protrusion is welded to the annular steel frame, so that the welding position of the first steel plate layer is at a certain distance from the heat conducting plate, which can reduce the impact of the welding temperature on the heat conducting plate and is conducive to improving the reliability of welding.

[0075] In one embodiment, the heat conducting plate is located on a side of the first steel-aluminum composite plate close to the receiving cavity.

[0076] By adopting the technical solution of this embodiment, the first steel-aluminum composite plate has good structural strength. The first steel-aluminum composite plate is located outside the box, which can eliminate protective parts, reduce the number of parts of the box, and improve assembly efficiency.

[0077] In one embodiment, the heat conducting plate is a flat plate structure, and the first steel-aluminum composite plate is recessed toward the heat conducting plate to form a heat exchange channel.

[0078] By adopting the technical solution of this embodiment, the battery cells are supported on the flat plate structure, and the support of the battery cells is stable and reliable. In addition, the heat exchange area between the battery cells and the flat plate structure is large, and the heat exchange effect of the battery cells is good, which is conducive to improving the performance of the battery.

[0079] In a second aspect, a battery is provided, comprising the box body as described in the above embodiment.

[0080] In a third aspect, an electrical device is provided, comprising the battery as described in the above embodiment.

[0081] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. 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 these drawings without any creative work.

[0083] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0084] FIG2 is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application.

[0085] FIG3 is a schematic diagram of the exploded structure of a box provided in some embodiments of the present application.

[0086] FIG4 is a schematic structural diagram of a box from one perspective provided in some other embodiments of the present application.

[0087] FIG5 is a schematic structural diagram of the box shown in FIG3 from another perspective.

[0088] FIG6 is a cross-sectional view taken along line AA in FIG5 .

[0089] FIG7 is a cross-sectional view of a box provided by some other embodiments of the present application along line AA in FIG5 .

[0090] FIG8 is a cross-sectional view of a box provided by some other embodiments of the present application along line AA in FIG5 .

[0091] FIG9 is a cross-sectional view of a box provided by some other embodiments of the present application along line AA in FIG5 .

[0092] FIG10 is a partial enlarged view of point B in FIG9 .

[0093] FIG11 is a partial enlarged view of the box provided in some other embodiments of the present application at point B in FIG9 .

[0094] FIG12 is a partial enlarged view of the box provided in some other embodiments of the present application at point B in FIG9 .

[0095] FIG13 is a cross-sectional view of a box provided by some other embodiments of the present application along line AA in FIG5 .

[0096] FIG14 is a partial enlarged view of point C in FIG13 .

[0097] FIG15 is a partial enlarged view of a box provided in some other embodiments of the present application at point C in FIG13 .

[0098] FIG16 is a schematic diagram of the exploded structure of a panel provided in some embodiments of the present application.

[0099] FIG17 is a schematic diagram of the exploded structure of panels provided in other embodiments of the present application.

[0100] , wherein the figure marks are: 1000, vehicle; 1100, battery; 1200, controller; 1300, motor; 100, box; 10, annular frame; 101, receiving cavity; 102, annular steel frame; 111, frame bar; 1111, hollow cavity; 1112, bending plate; 11121, bending starting part; 11122, bending part; 11123, bending ending part; 121, straight line segment; 122, arc segment; 131, annular main body; 132, first connecting part; 133, second connecting part; 20, plate; 201, heat exchange channel; 202, overlapping area; 211, first main body; 212, first flange part; 221, first steel-aluminum composite plate; 2211, first steel plate layer; 22111, covered area; 22112, uncovered area; 2212, first An aluminum plate layer; 2213, a second main body; 2214, a second flange portion; 22141, a bending section; 22142, a flange section; 2215, a protruding portion; 222, a heat conducting plate; 2221, an aluminum plate; 2222, a second steel-aluminum composite plate; 22221, a second steel plate layer; 22222, a second aluminum plate layer; 30, a seal; 41, a first box body; 42, a second box body; 51, a first welding structure; 52, a second welding structure; 53, a third welding structure; 54, a fourth welding structure; 55, a fifth welding structure; 56, a sixth welding structure; 200, a battery cell; 300, a seat beam. DETAILED DESCRIPTION

[0101] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0102] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0103] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Therefore, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0104] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments in any suitable manner.

[0105] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0106] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple sheets" refers to two or more (including two sheets). "Several" means one or more, unless otherwise specifically defined.

[0107] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0108] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0109] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0110] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. A battery generally includes a housing that encloses one or more battery cells. The housing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0111] In a battery, when there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell structure is housed within a housing. Alternatively, a battery can be constructed by first connecting multiple battery cells in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a single unit, which is then housed within a housing. The battery may also include other structures, such as a busbar assembly for electrically connecting multiple battery cells.

[0112] The battery cell in the embodiment of the present application includes an electrode assembly and a housing, and the electrode assembly is installed in the housing to protect the electrode assembly.

[0113] The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive electrode active material layer protrudes from the portion coated with the positive electrode active material layer. The portion not coated with the positive electrode active material layer serves as the positive electrode tab, or a metal conductor is welded to the positive electrode collector and led out to serve as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is applied to the surface of the negative current collector. The portion of the negative current collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. The portion not coated with the negative active material layer serves as the negative electrode tab, or a metal conductor is welded to the negative current collector and extended to serve as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. It is understood that the electrode assembly can have one positive electrode tab and one negative electrode tab. In other words, the electrode assembly is provided with two sets of tabs, each set containing at least one tab, with one set being the positive electrode tab and the other being the negative electrode tab.

[0114] The electrode assembly can be a wound structure or a laminated structure. The embodiments of the present application are not limited to this. The wound structure is mostly to weld the tabs to the current collector, and then arrange them in the order of positive electrode sheet-diaphragm-negative electrode sheet-diaphragm; and then form a cylindrical or square battery cell by winding. The laminated structure is mostly to lead out the tabs on the current collector, arrange the positive electrode sheet, negative electrode sheet and separator in the order of positive electrode sheet-diaphragm-negative electrode sheet-diaphragm, and stack them together layer by layer to form a laminated battery cell; wherein, the separator can be cut and directly laminated with the separator sheet, or the separator is not cut, but is folded in a Z shape. The material of the separator can be PP (Polypropylene, polypropylene) or PE (Polyethylene, polyethylene), etc. The separator is an insulating film arranged between the positive electrode sheet and the negative electrode sheet. Its main function is to isolate the positive and negative electrodes and prevent the electrons in the battery from passing freely, to prevent short circuits to a certain extent, and to allow the ions in the electrolyte to pass freely between the positive and negative electrodes to form a loop between the positive and negative electrodes. The positive electrode sheet and the negative electrode sheet are collectively referred to as the electrode sheet. The positive electrode tab and the negative electrode tab are collectively referred to as the tab.

[0115] The outer shell refers to the housing structure with a space inside to accommodate and protect the electrode assembly. The outer shell can be made of a material with a certain degree of hardness and strength. This prevents deformation during compression and collision, giving the battery cells greater structural strength and improved reliability. The outer shell can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0116] The outer casing of a battery cell is equipped with electrode terminals. Electrode terminals are conductive components attached to the outer casing. They connect to the tabs of the electrode assembly to output power from the battery cell or charge the battery cell. A battery cell generally has two electrode terminals, one connected to the positive and negative tabs of the electrode assembly. The electrode terminal connected to the positive tab is the positive electrode terminal, and the electrode terminal connected to the negative tab is the negative electrode terminal. The electrode assembly and electrode terminals are connected to form a battery cell.

[0117] When a battery cell is charged, the current converts electrical energy into chemical energy through chemical reactions between the electrolyte and electrodes, which is stored in the cell. During discharge, the chemical energy is converted back into electrical energy and released. This energy conversion process is accompanied by energy loss and heat generation. If the heat cannot be effectively dissipated due to poor heat dissipation within the battery cell, the cell can overheat. Battery cells have a certain internal resistance, and when current flows through this resistance, it generates resistance losses, causing internal heat generation. When the current is too high or the internal resistance is too high, the internal heat generation intensifies, leading to overheating. If a battery cell exceeds its maximum design voltage during charging, or if the voltage drops too low during discharge, the cell can overvoltage or overdischarge. Overcharging or overdischarging can trigger runaway chemical reactions within the cell, generating excessive heat and causing overheating. Furthermore, defects in the battery cell design or manufacturing process, such as improper material selection or poor cell assembly, can lead to poor internal heat dissipation or uneven current distribution, increasing the risk of overheating or overvoltage. Therefore, the battery cells may overheat or overvoltage during charging or use.

[0118] Battery cells typically contain a certain amount of gas. When a battery cell is charged or discharged, the electrolyte solution undergoes gas generation or absorption reactions. The generation of these gases causes the gas pressure inside the battery cell to increase, causing the battery cell to swell and deform. During the charging or discharging process, the positive and negative electrode materials undergo chemical reactions to form new compounds. These chemical reactions are accompanied by volume changes, which cause the volume of the materials inside the battery cell to change, causing the battery to swell and deform. When a battery cell is overcharged or over-discharged, the chemical reactions inside the battery cell can become uncontrolled, generating excessive gas or causing structural damage to the electrode materials, which in turn causes the battery cell to swell and deform. Charging or discharging a battery cell in a high-temperature environment accelerates the internal chemical reactions, increasing gas generation and volume changes. High temperatures also cause the materials inside the battery cell to expand, also causing the battery cell to swell and deform.

[0119] To reduce the risk of explosion or fire caused by overheating or overpressure during charging or use, battery cell casings are often equipped with pressure relief mechanisms such as explosion-proof valves and explosion-proof discs. These release internal gas or liquid when the temperature or pressure of a battery cell exceeds a safety threshold, thereby reducing the pressure inside the cell and lowering the risk of explosion. This improves the safety of the battery cell and reduces potential safety risks.

[0120] Batteries are widely used in a variety of electronic devices, including mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy planes, and power tools. Batteries are devices that store and release electrical energy, providing the power required by these electronic devices. Batteries can also be energy storage devices, such as energy storage containers and energy storage cabinets.

[0121] Batteries typically consist of a housing and battery cells. The battery cells are installed in the housing, which protects the battery cells and needs to be airtight to prevent external liquids from entering the housing, thereby affecting the charging and discharging of the battery cells. The housing typically includes a ring frame and a plate. The plate covers the opening of the ring frame to seal the steel frame opening. However, in actual manufacturing, the ring frame is made of multiple frame strips that are sealed end to end. The numerous sealing connection points on the ring frame can result in poor sealing performance of the housing.

[0122] Based on this, an embodiment of the present application provides a box body. Since the annular frame of the box body is formed by bending a border bar, and one end of the border bar is sealed with the other end of the border bar, the annular frame has a sealed connection position, and the number of sealed connection positions is small, which is conducive to improving the sealing performance of the box body.

[0123] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0124] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, among others. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, among others; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, among others; and 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, among others. The embodiments of the present application do not impose any particular restrictions on the above-mentioned electrical devices.

[0125] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0126] Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application.

[0127] The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1100 is provided inside the vehicle 1000. The battery 1100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 1100 may be used to power the vehicle 1000. For example, the battery 1100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to power the motor 1300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0128] In some embodiments of the present application, the battery 1100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0129] Please refer to Figures 2 to 5. Figure 2 is a schematic diagram of the exploded structure of the battery 1100 provided in some embodiments of the present application. Figure 3 is a schematic diagram of the exploded structure of the housing 100 provided in some embodiments of the present application. Figure 4 is a schematic diagram of the structure of the housing 100 provided in other embodiments of the present application from one perspective. Figure 5 is a schematic diagram of the structure of the housing 100 shown in Figure 3 from another perspective.

[0130] Referring to Figures 2 and 3 , in some embodiments, a battery 1100 includes a housing 100 and battery cells 200, with the battery cells 200 housed within the housing 100. The housing 100 is configured to provide a storage space for the battery cells 200 and can employ a variety of structures. In some embodiments, the housing 100 can include a first housing 41 and a second housing 42 , which cover each other and together define a storage space for the battery cells 200.

[0131] As shown in FIG. 2 , the first box body 41 and the second box body 42 may also be hollow structures both with one side open, and the open side of the first box body 41 covers the open side of the second box body 42 .

[0132] 3 , the second box body 42 may be a hollow structure with one side open, and the first box body 41 may be a plate-like structure. The first box body 41 covers the open side of the second box body 42 so that the first box body 41 and the second box body 42 jointly define a storage space.

[0133] Of course, the box body 100 formed by the first box body 41 and the second box body 42 can be in various shapes, such as a cylinder, a cuboid, etc.

[0134] In the battery 1100 , there may be multiple battery cells 200 , and the multiple battery cells 200 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 200 are connected in both series and in parallel.

[0135] In one embodiment, multiple battery cells 200 may be directly connected in series, parallel, or hybrid, and the entire battery 1100 may then be housed within the housing 100. Alternatively, the battery 1100 may be constructed by first connecting multiple battery cells 200 in series, parallel, or hybrid to form a battery module 1100, and then connecting multiple battery modules 1100 in series, parallel, or hybrid to form an entire battery 1100, which may then be housed within the housing 100. The battery 1100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 200.

[0136] Each battery cell 200 may be a secondary battery 1100 or a primary battery 1100; it may also be a lithium-sulfur battery 1100, a sodium-ion battery 1100, or a magnesium-ion battery 1100, but is not limited thereto. The battery cell 200 may be cylindrical, flat, rectangular, or in other shapes.

[0137] In some embodiments of the present application, referring to Figures 4 and 5, a box body 100 is provided, which includes an annular frame 10 and a plate 20. The annular frame 10 is surrounded by a receiving cavity 101; at least one side opening of the receiving cavity 101 is covered with the plate 20; wherein, the annular frame 10 is formed by bending a border strip 111, and one end of the border strip 111 is sealed and connected to the other end of the border strip 111.

[0138] The annular frame 10 may refer to the side of the box body 100 , the annular frame 10 may refer to an annular frame structure, the space formed by the annular frame 100 is the receiving cavity 101 , the annular frame 10 may also form the surrounding wall of the receiving cavity 101 , the receiving cavity 101 may also refer to the space for accommodating the battery cell 200 .

[0139] In the box 100 shown in Figures 4 and 5, the annular frame 10 is formed by a bent and enclosed frame strip 111, with one end of the frame strip 111 sealed to the other end. The frame strip 111 may be a plate 20, a profile, or the like, and the cross-sectional shape of the frame strip 111 may be, but is not limited to, an L-shape, a Z-shape, or a hollow structure with a hollow interior. The shape of the annular frame 10 may be, but is not limited to, circular, polygonal, or elliptical.

[0140] One end of the frame strip 111 and the other end of the frame strip 111 can be sealed and connected by means of sealant, welding, a sealing ring, etc.

[0141] 4 and 5 , the box 100 is a hollow structure with an opening on one side. The plate 20 may refer to the bottom plate of the box 100, which is disposed opposite the opening. The annular frame 10 may refer to the peripheral sidewall of the box 100. The interior space of the box 100 is a receiving chamber 101. The other end of the box 100 is open and can be connected to components on the vehicle 1000 to achieve a closed structure.

[0142] As shown in Figure 3, the box body 100 includes a first box body 41 and a second box body 42. The first box body 41 is a plate-like structure, and the second box body 42 is a hollow structure with an opening on one side. The annular frame 10 can refer to the surrounding side wall of the second box body 42; the plate 20 can refer to the first box body 41, or it can refer to the bottom plate of the second box body 42 arranged opposite to its opening. The space enclosed by the second box body 42 is the accommodating cavity 101.

[0143] As shown in Figure 2, the box body 100 includes a first box body 41 and a second box body 42. The first box body 41 and the second box body 42 are both hollow structures with an opening on one side. The annular frame 10 can refer to the surrounding side wall of the second box body 42. The plate 20 can refer to the first box body 41 or the bottom plate of the second box body 42 arranged opposite to its opening. The space enclosed by the second box body 42 is the accommodating cavity 101.

[0144] The plate 20 may refer to a component covering an opening on one side of the annular frame 10 , and the plate 20 may close the opening on one side of the annular frame 10 . The number of plate 20 may be two, with the two plate 20 covering the openings on opposite sides of the annular frame 10 to form a closed box 100 . Of course, the number of plate 20 may be one, with the plate 20 covering the opening on one side of the annular frame 10 , while the opening on the other side of the annular frame 10 is covered and closed with another plate-like structure. The plate 20 may be, but is not limited to, a steel plate, an aluminum plate 2221 , or a composite plate.

[0145] The box body 100 of the embodiment of the present application has an annular frame 10 formed by bending a border bar 111, and one end of the border bar 111 is sealed and connected to the other end of the border bar 111, so that a sealed connection of the annular frame 10 can be achieved. In addition, this method allows the annular frame 10 to have a sealed connection position, and the number of sealed connection positions is small, which is beneficial to improving the sealing performance of the box body 100 and also beneficial to improving the reliability of the battery 1100.

[0146] In other embodiments of the present application, referring to FIG. 4 and FIG. 5 , the border strip 111 is roll-bent to form the annular frame 10 .

[0147] It is understandable that the frame strip 111 is placed on a roll bender, and then the frame strip 111 is bent by applying pressure and controlling the movement of the roll bender, so that the frame strip 111 forms an annular frame 10 structure.

[0148] By adopting the technical solution of this embodiment, the border strip 111 is bent by roller bending to obtain the annular frame 10. The roller bending operation is efficient and has high bending precision. The production operation of the annular frame 10 is simple and the cost is low. In addition, during the roller bending process, the internal structure and strength of the border strip 111 remain basically unchanged. Therefore, the roller bending can achieve the bending of the desired shape without reducing the performance of the border strip 111, which is beneficial to improving the structural strength of the box body 100 and improving the reliability of the battery 1100.

[0149] In other embodiments of the present application, referring to FIG. 4 and FIG. 5 , one end of the frame bar 111 is welded to the other end of the frame bar 111 .

[0150] It can be understood that one end of the frame bar 111 is connected to the other end of the frame bar 111 by welding; one end of the frame bar 111 and the other end of the frame bar 111 can be welded by arc welding, gas shielded welding, submerged arc welding, electroslag welding, laser welding, friction welding, ultrasonic welding, explosion welding and other welding methods.

[0151] For example, welding can be performed around the ends of the frame strip 111 to form a ring-shaped first welding structure 51. This allows the two ends of the frame strip 111 to be stably welded together, resulting in better sealing at both ends of the frame strip 111, which helps improve the sealing of the box body 100. The first welding structure 51 can be a weld seam, a weld point, a weld mark, or other structures.

[0152] By adopting the technical solution of this embodiment, the two ends of the frame strip 111 are sealed and connected by welding. After welding, the sealing performance between the two ends of the frame strip 111 is good, which is beneficial to improving the sealing performance of the box body 100. In addition, the welding operation is simple, which is beneficial to improving the production efficiency of the box body 100 and reducing the production cost of the box body 100.

[0153] In other embodiments of the present application, referring to FIG. 4 and FIG. 5 , the annular frame 10 includes a plurality of straight segments 121 and a plurality of arc segments 122 . The plurality of straight segments 121 are arranged around the receiving cavity 101 , and an arc segment 122 is connected between two adjacent straight segments 121 .

[0154] The straight segment 121 may refer to a straight segment of the annular frame 10 , and the arc segment 122 may refer to an arc segment of the annular frame 10 . The arc segment 122 may have various shapes, such as a circular arc, an elliptical arc, and the like.

[0155] A plurality of straight segments 121 are arranged at intervals along the circumference of the receiving cavity 101. The adjacent ends of two adjacent straight segments 121 are connected to the ends of the arc segment 122, thereby forming the annular frame 10. The first welding structure 51 can be located on the straight segment 121, at the connection between the arc segment 122 and the straight segment 121, or on the arc segment 122, depending on the actual bending method of the frame strip 111.

[0156] The number of straight segments 121 can be but is not limited to three, four or five, and the number of arc segments 122 can be but is not limited to three, four or five; the number of arc segments 122 is equal to the number of straight segments 121, so that multiple straight segments 121 and multiple arc segments 122 can be arranged to form an annular frame 10.

[0157] As an example, the number of the straight segments 121 is four, and the number of the arc segments 122 is four. The four straight segments 121 and the four arc segments 122 are arranged to form a quadrilateral annular frame 10 .

[0158] By adopting the technical solution of this embodiment, a smooth transition is formed between two adjacent straight segments 121 through the arc segment 122, which is beneficial to reducing stress concentration, improving the structural strength of the annular frame 10, and improving the structural strength of the box body 100.

[0159] In other embodiments of the present application, referring to FIG. 4 and FIG. 5 , the arc segment 122 is a circular arc segment.

[0160] It can be understood that the shape of the arc segment 122 is an arc.

[0161] As an example, the shape of the arc segment 122 can be a quarter arc, thereby forming a quadrilateral annular frame 10. Of course, in other examples, the shape of the arc segment 122 can also be a fifth arc, a third arc, etc., which can be determined according to the shape of the annular frame 10.

[0162] By adopting the technical solution of this embodiment, the two straight line segments 121 are smoothly connected by an arc segment, and the risk of stress concentration at the connection is smaller, the structural strength is better, and it is more conducive to improving the structural strength of the box 100; and the bending operation of the arc segment is simple, which is conducive to reducing production costs.

[0163] In other embodiments of the present application, referring to FIG. 4 and FIG. 5 , the radius of the inner wall surface of the arc segment is R, wherein 40 mm ≤ R ≤ 200 mm.

[0164] The inner wall surface of the arc segment may refer to the wall surface of the arc segment close to the receiving cavity 101 , and the wall surface is cylindrical, and the radius corresponding to the wall surface is R.

[0165] 40mm≤R≤200mm. It can be understood that R≥40mm makes the arc have a certain radius to reduce the difficulty of bending, and R≤200mm makes the radius of the arc segment not too large, so that the accommodating cavity 101 has a larger space to accommodate more battery cells 200 and improve the energy density of the battery 1100.

[0166] By adopting the technical solution of this embodiment, the radius of the inner wall surface of the arc segment is reasonably set, which can take into account both the production of the annular frame 10 and the energy density of the battery 1100.

[0167] In other embodiments of the present application, referring to FIG. 4 and FIG. 5 , 60 mm ≤ R ≤ 120 mm.

[0168] By adopting the technical solution of this embodiment, the radius of the inner wall surface of the arc segment is set more reasonably, which can better take into account both the production of the annular frame 10 and the energy density of the battery 1100.

[0169] In some embodiments, the value of R can be 40 mm, 200 mm, or any value between 40 mm and 200 mm. For example, the value of R can be, but is not limited to, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, or 200 mm.

[0170] Please refer to Figures 6 to 9. Figure 6 is a cross-sectional view taken along line AA in Figure 5. Figure 7 is a cross-sectional view of the box body 100 provided in some other embodiments of the present application along line AA in Figure 5. Figure 8 is a cross-sectional view of the box body 100 provided in some other embodiments of the present application along line AA in Figure 5. Figure 9 is a cross-sectional view of the box body 100 provided in some other embodiments of the present application along line AA in Figure 5.

[0171] In other embodiments of the present application, referring to FIG. 6 and FIG. 9 , the frame strip 111 is hollow inside and encloses one or more hollow cavities 1111 .

[0172] It can be understood that the border strip 111 is a hollow structure, the cross-section of the border strip 111 is a hollow structure, the chamber inside the border strip 111 forms a hollow cavity 1111, and the number of hollow cavities 1111 can be but is not limited to one, two, three, four or more than five.

[0173] For example, referring to FIG. 6 , the number of the hollow cavity 1111 of the border strip 111 is one, the cross section of the border strip 111 is quadrilateral, and the inner space of the quadrilateral forms one hollow cavity 1111 .

[0174] For example, referring to Figure 9, the number of hollow cavities 1111 of the border strip 111 is three, and the cross-section of the outer peripheral wall of the border strip 111 is a quadrilateral. A partition portion is provided inside the quadrilateral, and the partition portion separates two adjacent hollow cavities 1111. At the same time, the partition portion acts as the outer peripheral wall of the border strip 111, which is beneficial to improving the structural strength of the annular frame 10.

[0175] By adopting the technical solution of this embodiment, the frame strip 111 has a hollow structure, which improves the structural strength of the frame strip 111, the annular frame 10, and the box body 100, thereby improving the reliability of the battery 1100. In addition, the provision of the hollow cavity 1111 also helps reduce material accumulation and reduce the production cost of the box body 100.

[0176] In other embodiments of the present application, referring to FIG. 6 and FIG. 9 , the frame strip 111 includes a bending plate 1112 , and the bending plate 1112 is bent to form a hollow cavity 1111 .

[0177] It can be understood that the bending plate 1112 forms a frame strip 111 with a hollow interior after being bent.

[0178] By adopting the technical solution of this embodiment, the frame strip 111 is formed by bending the bending plate 1112 . The manufacturing method of the frame strip 111 is simple, which is conducive to reducing the manufacturing cost of the box body 100 .

[0179] In other embodiments of the present application, referring to FIG. 6 and FIG. 9 , the bending plate 1112 is roll-bent to form a hollow cavity 1111 .

[0180] It can be understood that the bending plate 1112 is formed into a frame strip 111 with a hollow interior after being roller-bent.

[0181] By adopting the technical solution of this embodiment, the border strip 111 is formed by roller bending the bending plate 1112. The manufacturing method of the border strip 111 is simple, which is beneficial to reducing the manufacturing cost of the box 100; the structural strength of the border strip 111 made by roller bending is good, which is beneficial to improving the structural strength of the box 100.

[0182] In other embodiments of the present application, referring to Figures 6 and 9, the bending plate 1112 includes a bending starting portion 11121, a bending portion 11122 and a bending ending portion 11123 that are connected to each other, and the bending starting portion 11121 is fixedly connected to the bending ending portion 11123; or, the bending starting portion 11121 is fixedly connected to the bending portion 11122; or, the bending ending portion 11123 is fixedly connected to the bending portion 11122.

[0183] For example, before the bending plate 1112 is bent, the bending plate 1112 has a first side and a second side that are relatively set. After the bending plate 1112 is bent from the first side to the second side for multiple times, an internal hollow frame strip 111 is obtained, wherein the part from the first side to the first bend in the bending plate 1112 is the bending starting part 11121, the part from the second side to the last bend in the bending plate 1112 is the bending ending part 11123, and the part of the bending plate 1112 located at the first bend and the last bend is the bending part 11122.

[0184] In some cases, after being bent, the bending plate 1112 may spread out due to its own restoring force, making it difficult to maintain the hollow shape, which seriously affects the structural strength of the frame strip 111.

[0185] In one possible embodiment, as shown in FIG6 , the bend start portion 11121 is fixedly connected to the bend end portion 11123 to reduce the risk of the bent plate 1112 falling apart, allowing the frame strip 111 to maintain a hollow shape, thereby improving the structural strength of the box 100. The bend start portion 11121 and the bend end portion 11123 can be fixedly connected by welding, screwing, bonding, or the like.

[0186] In another possible embodiment, as shown in FIG9 , the bend start portion 11121 is fixedly connected to the bend portion 11122, which can also prevent the bend plate 1112 from spreading, allowing the frame strip 111 to maintain a hollow shape, thereby improving the structural strength of the box 100. The bend start portion 11121 and the bend portion 11122 can be fixedly connected by welding, screwing, bonding, etc. The bend end portion 11123 and the bend portion 11122 can be fixedly connected.

[0187] In another possible embodiment, as shown in FIG9 , the bend stop 11123 is fixedly connected to the bend portion 11122, which can also prevent the bend plate 1112 from spreading, allowing the frame strip 111 to maintain a hollow shape, thereby improving the structural strength of the box 100. The bend stop 11123 and the bend portion 11122 can be fixedly connected by welding, screwing, bonding, etc. Specifically, the bend stop 11123 and the bend portion 11122 can be fixedly connected.

[0188] As an example, referring to Figure 9, the bending plate 1112 is arranged to form three hollow cavities 1111, the bending starting portion 11121 is welded to the bending portion 11122 to form a second welding structure 52, and the bending ending portion 11123 is welded to the bending portion 11122 to form a third welding structure 53. In this way, the frame strip 111 can be stably maintained in a hollow shape, so that the box body 100 has good structural strength; the second welding structure 52 and the third welding structure 53 can be but are not limited to welds, welding points, and weld marks.

[0189] By adopting the technical solution of this embodiment, the bending plate 1112 can also be restricted from spreading out, so that the frame strip 111 can maintain a hollow shape, which is beneficial to improving the structural strength of the box body 100.

[0190] In other embodiments of the present application, referring to Figures 6 and 7, when the bending starting portion 11121 is connected to the bending ending portion 11123, the bending starting portion 11121 and the bending ending portion 11123 are fixedly docked; or, the bending starting portion 11121 and the bending ending portion 11123 are fixedly overlapped.

[0191] The bending starting portion 11121 and the bending ending portion 11123 are fixedly docked. It can be understood that the bending starting portion 11121 and the bending ending portion 11123 are fixedly connected face to face; for example, referring to Figure 6, the cross-section of the border strip 111 is a quadrilateral, the first side and the second side of the bending plate 1112 are arranged face to face, and the first side and the second side are fixedly connected, thereby realizing the docking of the bending starting portion 11121 and the bending ending portion 11123; the bending starting portion 11121 and the bending ending portion 11123 are welded and docked to form a fourth welding structure 54, and the fourth welding structure 54 can be but is not limited to a weld, a weld point, or a weld mark.

[0192] The bending starting portion 11121 and the bending ending portion 11123 are fixedly overlapped. It can be understood that the bending starting portion 11121 and the bending ending portion 11123 are overlapped and fixedly connected; for example, referring to Figure 7, the bending ending portion 11123 and the bending starting portion 11121 are stacked, overlapped and fixedly connected, thereby realizing the overlapping and fixation of the bending starting portion 11121 and the bending ending portion 11123; the bending starting portion 11121 and the bending ending portion 11123 are welded and fixed to form a fifth welding structure 55. The fifth welding structure 55 can be but is not limited to a weld, a weld point, or a weld mark.

[0193] In a possible embodiment, referring to FIG6 , when the bending starting portion 11121 is connected to the bending ending portion 11123 , the bending starting portion 11121 and the bending ending portion 11123 are fixedly docked, which can reduce material accumulation and help reduce manufacturing costs.

[0194] In another possible embodiment, referring to Figure 7, when the bending starting portion 11121 is connected to the bending ending portion 11123, the bending starting portion 11121 and the bending ending portion 11123 are fixedly overlapped; the connection area between the bending starting portion 11121 and the bending ending portion 11123 is large, which is conducive to improving the connection reliability between the bending starting portion 11121 and the bending ending portion 11123.

[0195] By adopting the technical solution of this embodiment, the connection between the bending starting portion 11121 and the bending ending portion 11123 can be flexibly set to meet the use requirements of border strips 111 of different shapes.

[0196] In other embodiments of the present application, referring to Figure 7, the annular frame 10 includes an annular body 131 and a first connecting portion 132 connected to the annular body 131. The annular body 131 is arranged to form a receiving cavity 101, and the first connecting portion 132 is located on the side of the annular body 131 facing away from the receiving cavity 101; the edge of the plate 20 is covered by the end of the first connecting portion 132 away from the annular body 131.

[0197] The annular body 131 may refer to the main body of the annular frame 10, and the first connecting portion 132 may refer to the portion protruding from the annular body 131 and facing away from the receiving cavity 101. For example, the portion of the bend starting portion 11121 that protrudes from the bend portion 11122 facing away from the receiving cavity 101 forms the first connecting portion 132, and the bend portion 11122 and the bend starting portion 11121 form the annular body 131.

[0198] In some cases, the surface of the bending plate 1112 is covered with a plating layer, while the end surface of the first connecting portion 132 away from the annular body 131 is usually not covered with a plating layer. The end surface without the plating layer is exposed to the outside and is easily corroded, thereby affecting the reliability of the frame strip 111.

[0199] The edge of the plate 20 covers the end of the first connection portion 132 away from the annular body 131 , that is, the edge of the plate 20 covers the end of the first connection portion 132 away from the annular body 131 .

[0200] By adopting the technical solution of this embodiment, the edge of the plate 20 is wrapped around the end of the first connecting part 132 away from the annular body 131, so that the edge of the plate 20 covers the end face of the first connecting part 132 away from the annular body 131, reducing the exposure of the end face of the first connecting part 132 away from the annular body 131, and reducing the risk of corrosion of the end face of the first connecting part 132 away from the annular body 131, which is beneficial to improving the reliability and service life of the border strip 111.

[0201] In other embodiments of the present application, as shown in Figure 7, the edge of the plate 20 is bent so that the plate 20 forms a first main body portion 211 and a first flange portion 212, and the end of the first connecting portion 132 away from the annular body 131 is located between the first main body portion 211 and the first flange portion 212.

[0202] After the edge of the plate 20 is bent, the plate 20 forms a first main body portion 211 and a first flange portion 212. The first main body portion 211 may refer to the main part of the plate 20. The first main body portion 211 covers the opening on one side of the accommodating cavity 101. The first flange portion 212 may refer to the part of the plate 20 that is flipped relative to the first main body portion 211.

[0203] For example, referring to Figure 7, the plate 20 covers the lower opening of the accommodating cavity 101, and the edge of the plate 20 is bent upward so that the edge of the plate 20 abuts against the upper surface of the first connecting portion 132, that is, the end of the first connecting portion 132 away from the annular body 131 is located between the first main body portion 211 and the first flange portion 212, so that the end of the first connecting portion 132 away from the annular body 131 can be wrapped to achieve the edging of the first connecting portion 132.

[0204] By adopting the technical solution of this embodiment, the edge of the plate 20 can be bent to wrap the end of the first connecting part 132 away from the annular body 131. The edging operation is simple, which is conducive to simplifying the assembly operation of the box 100 and also helps to reduce the production cost of the box 100.

[0205] In other embodiments of the present application, referring to Figures 7 and 8, the box body 100 also includes a seal 30, one side of which overlaps the surface of the first flange portion 212 facing away from the first main body portion 211; the other side of the seal 30 overlaps at least one of the surface of the annular body 131 facing away from the accommodating cavity 101 and the surface of the first connecting portion 132 facing away from the first main body portion 211.

[0206] In some cases, the surface of the plate 20 is covered with a plating layer, while the end surface of the first flange portion 212 is usually not covered with the plating layer. The end surface without the plating layer is exposed and easily corroded, thereby affecting the reliability of the plate 20.

[0207] Seal 30 refers to a material or component used to seal or connect two or more components. It is typically used to prevent liquid, gas, or dust from entering or escaping the gap between connected components. Seal 30 can be in the form of sealant, sealing tape, or the like.

[0208] One side of the seal 30 overlaps the surface of the first flange portion 212 facing away from the first main body portion 211; the other side of the seal 30 overlaps at least one of the surface of the annular body 131 facing away from the accommodating cavity 101 and the surface of the first connecting portion 132 facing away from the first main body portion 211. It can be understood that one side of the seal 30 covers and is fixed on the surface of the first flange portion 212 facing away from the first main body portion 211, and the other side of the seal 30 covers and is fixed on at least one of the surface of the annular body 131 facing away from the accommodating cavity 101 and the surface of the first connecting portion 132 facing away from the first main body portion 211.

[0209] In a possible embodiment, as shown in FIG. 7 , one side of the seal 30 overlaps the surface of the first flange portion 212 facing away from the first main body portion 211 , and the other side of the seal 30 overlaps the surface of the annular body 131 facing away from the accommodating cavity 101 .

[0210] In another possible embodiment, as shown in Figure 8, one side of the seal 30 overlaps the surface of the first flange portion 212 facing away from the first main body portion 211, and the other side of the seal 30 overlaps at least one of the surfaces of the first connecting portion 132 facing away from the first main body portion 211.

[0211] In another possible embodiment, one side of the seal 30 overlaps the surface of the first flange portion 212 facing away from the first main body portion 211; the other side of the seal 30 overlaps the surface of the annular body 131 facing away from the accommodating cavity 101 and the surface of the first connecting portion 132 facing away from the first main body portion 211.

[0212] By adopting the technical solution of this embodiment, the seal 30 can seal the gap between the first flange portion 212 and the first connecting portion 132, which is beneficial to improving the sealing performance of the plate 20 and the annular frame 10, and improving the sealing performance of the box body 100. In addition, the seal 30 can also separate the end face of the first flange portion 212 from the external environment, reducing the risk of corrosion of the end face of the first flange portion 212, which is beneficial to improving the reliability and service life of the plate 20.

[0213] Please refer to Figures 10 to 17. Figure 10 is a partial enlarged view of point B in Figure 9. Figure 11 is a partial enlarged view of point B in Figure 9 of the box body 100 provided in some other embodiments of the present application. Figure 12 is a partial enlarged view of point B in Figure 9 of the box body 100 provided in some other embodiments of the present application. Figure 13 is a cross-sectional view of the box body 100 along line AA in Figure 5 provided in some other embodiments of the present application. Figure 14 is a partial enlarged view of point C in Figure 13. Figure 15 is a partial enlarged view of point C in Figure 13 of the box body 100 provided in some other embodiments of the present application. Figure 16 is a schematic diagram of the decomposed structure of the panel 20 provided in some embodiments of the present application. Figure 17 is a schematic diagram of the decomposed structure of the panel 20 provided in other embodiments of the present application.

[0214] In other embodiments of the present application, referring to Figures 9 and 10, the annular frame 10 includes an annular main body 131 and a second connecting portion 133 connected to the annular main body 131. The annular main body 131 is arranged to form a receiving cavity 101, and the second connecting portion 133 is located on the side of the annular main body 131 facing the receiving cavity 101; the edge of the plate 20 is connected to the second connecting portion 133.

[0215] The second connection portion 133 may refer to the portion of the annular frame 10 protruding from the annular body 131 toward the receiving cavity 101. For example, the portion of the bending starting portion 11121 protruding from the bending portion 11122 toward the receiving cavity 101 forms the second connection portion 133, and the bending portion 11122 and the bending starting portion 11121 form the annular body 131.

[0216] The edge of the plate 20 is connected to the second connection portion 133 , and the edge of the plate 20 and the second connection portion 133 can be connected by welding, screwing, bonding, or the like.

[0217] By adopting the technical solution of this embodiment, the second connecting portion 133 is located on the side of the annular main body 131 facing the accommodating cavity 101 and is connected to the second connecting portion 133, that is, the plate 20 is connected to the inner side of the annular frame 10, which can reduce the external dimensions of the box body 100 and improve the volume energy density of the battery 1100.

[0218] In other embodiments of the present application, referring to FIG. 9 and FIG. 10 , the edge of the plate 20 abuts against the surface of the second connection portion 133 facing the receiving cavity 101 .

[0219] It is understandable that the plate 20 is located in the receiving cavity 101 , and the edge of the plate 20 abuts against the second connecting portion 133 .

[0220] By adopting the technical solution of this embodiment, the battery cell 200 is placed in the accommodating cavity 101, and the plate 20 supports the battery cell 200, and the edge of the plate 20 abuts against the surface of the second connecting part 133 facing the accommodating cavity 101, so that the second connecting part 133 can support the plate 20 and reduce the force on the connection structure between the plate 20 and the second connecting part 133. The connection reliability between the plate 20 and the second connecting part 133 is good, and the structural strength of the box body 100 is good, which is conducive to improving the reliability of the battery 1100.

[0221] In some cases, the plate 20 is made of aluminum and the annular frame 10 is made of steel. Due to the different thermal expansion coefficients of aluminum and steel, the thermal expansion during welding is uneven, which can easily cause problems such as cracks and deformation. Therefore, bolts are usually used to connect the plate 20 and the annular frame 10. In order to achieve a stable connection and a better sealing effect between the plate 20 and the annular frame 10, the bolts need to be distributed around the opening of the annular frame 10. With this arrangement, a large number of bolts are required, the assembly time of the box 100 is long, and the assembly efficiency of the box 100 is low.

[0222] In other embodiments of the present application, referring to Figures 9, 10 and 16, the annular frame 10 is an annular steel frame 102, and the plate 20 includes a first steel-aluminum composite plate 221. The first steel-aluminum composite plate 221 includes a first steel plate layer 2211 and a first aluminum plate layer 2212 that are stacked. The first steel plate layer 2211 is welded to the annular steel frame 102.

[0223] The annular frame 10 is an annular steel frame 102. It is understood that the annular frame 10 is made of steel. For example, a steel plate can be bent to form a frame bar 111, and then the frame bar 111 is bent to form the annular frame 10.

[0224] The first steel-aluminum composite plate 221 may be a composite plate formed by cladding a steel plate and an aluminum plate 2221. The cladding process of the steel plate and the aluminum plate 2221 may include, but is not limited to, explosive cladding, explosive rolling cladding, or rolling cladding. For example, after cleaning, the steel plate and the aluminum plate 2221 are conveyed to a rolling machine via a conveyor mechanism for rolling cladding. The steel plate and the aluminum plate 2221 then undergo diffusion heat treatment, leveling, finish rolling, stamping, and inspection to ultimately form the first steel-aluminum composite plate 221. The steel plate forms the first steel plate layer 2211 of the first steel-aluminum composite plate 221, and the aluminum plate 2221 forms the first aluminum plate layer 2212 of the first steel-aluminum composite plate 221. Of course, the number of first steel plate layers 2211 in the first steel-aluminum composite plate 221 can be one, two, three or more than four, and the number of first aluminum plate layers 2212 can also be one, two, three or more than four; for example, the first steel-aluminum composite plate 221 includes a first steel plate layer 2211 and a first aluminum plate layer 2212, and the first steel plate layer 2211 is located between the second connecting portion 133 and the first aluminum plate layer 2212 to facilitate welding of the first steel plate layer 2211 and the second connecting portion 133; for example, the first steel-aluminum composite plate 221 includes two first steel plate layers 2211 and a first aluminum plate layer 2212, and the first aluminum plate layer 2212 is located between the two first steel plate layers 2211 to facilitate welding of the first steel plate layer 2211 and the annular steel frame 102.

[0225] For example, the first aluminum plate layer 2212 may be located on the side of the first steel plate layer 2211 close to the receiving cavity 101 , or may be located on the side of the first steel plate layer 2211 facing away from the receiving cavity 101 .

[0226] The first steel plate layer 2211 is welded to the annular steel frame 102. The first steel plate layer 2211 and the annular steel frame 102 can be welded by arc welding, gas shielded welding, submerged arc welding, electroslag welding, laser welding, friction welding, ultrasonic welding, explosion welding or other welding methods.

[0227] By adopting the technical solution of this embodiment, since the first steel plate layer 2211 of the first steel-aluminum composite panel 221 in the panel 20 of the box body 100 and the steel frame are both made of steel material, the first steel plate layer 2211 can be welded to the steel frame. In this way, the connection between the panel 20 and the steel frame can reduce the use of bolts or even eliminate bolts, thereby reducing the number of parts of the box body 100 and improving the assembly efficiency of the box body 100.

[0228] In addition, the first steel-aluminum composite plate 221 has the characteristics of high strength and high melting point of steel, and the excellent electrical conductivity, thermal conductivity, good corrosion resistance, and low density of aluminum. After the two are combined, the excellent properties of the two metals are fully utilized, thereby increasing the structural strength of the box body 100 and reducing the weight and production cost of the box body 100.

[0229] In some cases, the plate 20 and the annular steel frame 102 are connected by bolts, and the bolts are sealed by coating the entire circle with sealant or using sealing foam. This sealing method is complicated, and the sealing interfaces between the bolts and the plate 20 and the bolts and the annular steel frame 102 are complicated, and the seal is prone to failure. However, in the box body 100 of the embodiment of the present application, the first steel plate layer 2211 and the annular steel frame 102 are connected by welding. The connection interface between the first steel plate layer 2211 and the annular steel frame 102 is simple, the welding seal is simple, and the sealing effect is good.

[0230] In some cases, due to the low melting point of the first aluminum plate layer 2212, if the welding temperature of the first steel plate layer 2211 and the annular steel frame 102 is high, the first aluminum plate layer 2212 may melt, resulting in welding defects, thereby affecting the connection reliability of the first steel-aluminum composite plate 221 and the annular steel frame 102.

[0231] In other embodiments of the present application, as shown in Figure 11, the first steel plate layer 2211 includes a covering area 22111 and an uncovered area 22112 connected to the covering area 22111, the first aluminum plate layer 2212 covers the covering area 22111, and the uncovered area 22112 is welded to the annular steel frame 102.

[0232] The covered area 22111 may refer to an area where the first steel plate layer 2211 is covered with the first aluminum plate layer 2212 , and the uncovered area 22112 may refer to an area where the first steel plate layer 2211 is not covered with the first aluminum plate layer 2212 .

[0233] The uncovered area 22112 is welded to the annular steel frame 102 . The uncovered area 22112 can be welded to the annular steel frame 102 by resistance spot welding, arc welding, laser welding, or the like.

[0234] In some cases, the first aluminum plate layer 2212 can be peeled off in some areas on the first steel plate layer 2211 by mechanical means or chemical means. The area on the first steel plate layer 2211 where the first aluminum plate layer 2212 is peeled off is the uncovered area 22112, and the area on the first steel plate layer 2211 where the first aluminum plate layer 2212 is not removed is the covered area 22111.

[0235] By adopting the technical solution of this embodiment, by setting the uncovered area 22112 on the first steel-aluminum composite plate 221, the first steel plate layer 2211 in the uncovered area 22112 is exposed, which facilitates welding of the first steel-aluminum composite plate 221 to the annular steel frame 102.

[0236] In addition, the first aluminum plate layer 2212 can be placed at a certain distance from the welding area to reduce the impact of the welding temperature on the first aluminum plate layer 2212, which is beneficial to improving the reliability of welding; in addition, the first aluminum plate layer 2212 can be placed at a certain distance from the welding area, so that the first steel plate layer 2211 and the annular steel frame 102 can be welded using a welding method with a higher welding temperature, so that more welding methods can be used between the first steel plate layer 2211 and the annular steel frame 102 to reduce welding costs. For example, the welding method between the first steel plate layer 2211 and the annular steel frame 102 can be resistance spot welding or arc welding to reduce welding costs.

[0237] In some embodiments, referring to FIG. 3 , the periphery of the first steel plate layer 2211 is welded to the annular steel frame 102 .

[0238] The periphery of the first steel plate layer 2211 may refer to an edge portion of the first steel plate layer 2211 away from the center thereof.

[0239] As an example, as shown in FIG3 , the four edges of the first steel plate layer 2211 are respectively welded to the four sides of the annular frame 10 to form an annular sixth welded structure 56. The annular sixth welded structure 56 is disposed around the first steel plate layer 2211 to seal the opening of the annular steel frame 102. The sixth welded structure 56 can be a weld point, weld seam, weld spot, weld mark, or other structure.

[0240] By adopting the technical solution of this embodiment, the entire periphery of the first steel plate layer 2211 and the annular steel frame 102 can obtain an annular sixth welding structure 56, which can improve the sealing performance at the opening of the annular steel frame 102; in addition, there is no need to set other sealing structures at the opening of the annular steel frame 102, which is conducive to improving the assembly efficiency of the box 100.

[0241] In other embodiments of the present application, referring to Figures 13 and 14, the edge of the first steel-aluminum composite plate 221 is bent toward the first aluminum plate layer 2212, so that the first steel-aluminum composite plate 221 forms a second main body portion 2213 and a second flange portion 2214; the first steel plate layer 2211 of the second flange portion 2214 is welded to the annular steel frame 102; and / or, the first steel plate layer 2211 of the second main body portion 2213 is welded to the annular steel frame 102.

[0242] The second main body portion 2213 may refer to the main body portion of the first steel-aluminum composite panel 221 ; the second flange portion 2214 may refer to the edge portion of the first steel-aluminum composite panel 221 that is bent and flipped relative to the second main body portion 2213 .

[0243] The edge of the first steel-aluminum composite plate 221 is bent toward the first aluminum plate layer 2212 , so that the first steel plate layer 2211 of the first steel-aluminum composite plate 221 is located on the outside, so that the annular steel frame 102 and the first aluminum plate layer 2212 can be separated by the first steel plate layer 2211 .

[0244] In a possible embodiment, the edge of the first steel-aluminum composite plate 221 is bent toward the first aluminum plate layer 2212 so that the first steel-aluminum composite plate 221 forms a second main body portion 2213 and a second flange portion 2214; the first steel plate layer 2211 of the second flange portion 2214 is welded to the annular steel frame 102.

[0245] For example, the first aluminum plate layer 2212 is located on the side of the first steel-aluminum composite plate 221 close to the receiving cavity 101, and the second flange portion 2214 can be inserted into the receiving cavity 101, so that the first steel plate layer 2211 of the second flange portion 2214 can be arranged opposite to the surface of the annular steel frame 102 facing the receiving cavity 101, so as to facilitate welding of the first steel plate layer 2211 of the second flange portion 2214 and the annular steel frame 102.

[0246] For example, the first steel plate layer 2211 is located on the side of the first steel-aluminum composite plate 221 close to the receiving cavity 101, and the first steel plate layer 2211 of the second flange portion 2214 is adjacent to the annular steel frame 102, thereby achieving welding of the first steel plate layer 2211 of the second flange portion 2214 and the annular steel frame 102. The second flange portion 2214 may be inserted into the receiving cavity 101 or may not be inserted into the receiving cavity 101.

[0247] In another possible embodiment, the edge of the first steel-aluminum composite plate 221 is bent toward the first aluminum plate layer 2212 so that the first steel-aluminum composite plate 221 forms a second main body portion 2213 and a second flange portion 2214; the first steel plate layer 2211 of the second main body portion 2213 is welded to the annular steel frame 102.

[0248] For example, the first aluminum plate layer 2212 is located on the side of the first steel-aluminum composite plate 221 close to the accommodating cavity 101, the second flange portion 2214 is completely inserted into the accommodating cavity 101, and the edge of the first steel plate layer 2211 of the second main body portion 2213 close to the second flange portion 2214 can be welded to the annular steel frame 102.

[0249] For example, the first steel plate layer 2211 is located on the side of the first steel-aluminum composite plate 221 close to the receiving cavity 101, the second main body 2213 is located in the receiving cavity 101, and the second main body 2213 directly abuts against the annular steel frame 102 and is welded to the annular steel frame 102.

[0250] In another possible embodiment, the edge of the first steel-aluminum composite plate 221 is bent toward the first aluminum plate layer 2212 so that the first steel-aluminum composite plate 221 forms a second main body portion 2213 and a second flange portion 2214; the first steel plate layer 2211 of the second flange portion 2214 is welded to the annular steel frame 102, and the first steel plate layer 2211 of the second main body portion 2213 is welded to the annular steel frame 102.

[0251] For example, when the first aluminum plate layer 2212 is located on the side of the first steel-aluminum composite plate 221 close to the accommodating cavity 101, the second flange portion 2214 is completely inserted into the accommodating cavity 101, and the edge of the first steel plate layer 2211 of the second main body portion 2213 close to the second flange portion 2214 can be welded to the annular steel frame 102, and the first steel plate layer 2211 of the second flange portion 2214 is welded to the annular steel frame 102.

[0252] For example, when the first steel plate layer 2211 is located on the side of the first steel-aluminum composite plate 221 close to the accommodating cavity 101, the second main body 2213 is located inside the accommodating cavity 101, or the second main body 2213 is located outside the accommodating cavity 101; when the second main body 2213 is located outside the accommodating cavity 101, the second main body 2213 directly abuts against the annular steel frame 102, the first steel plate layer 2211 of the second main body 2213 is welded to the annular steel frame 102, and the first steel plate layer 2211 of the second flange portion 2214 is welded to the annular steel frame 102.

[0253] By adopting the technical solution of this embodiment, after the edge of the first steel-aluminum composite plate 221 is bent toward the first aluminum plate layer 2212, the first steel plate layer 2211 is covered on the outside of the first aluminum plate layer 2212. The first steel plate layer 2211 can separate the annular steel frame 102 and the first aluminum plate layer 2212, thereby protecting the first aluminum plate layer 2212 and reducing the impact of the high temperature of welding the first steel plate layer 2211 and the annular steel frame 102 on the first aluminum plate layer 2212, which is conducive to reducing welding defects, improving welding quality, and improving the connection reliability of the first steel-aluminum composite plate 221 and the annular steel frame 102.

[0254] In some other embodiments of the present application, referring to FIG. 14 , the included angle between the second flange portion 2214 and the second main body portion 2213 is α, wherein 90°≤α<180°.

[0255] It can be understood that the bending angle β of the second flange portion 2214 relative to the second main body portion 2213 is less than or equal to 90°, and the angle α between the second flange portion 2214 and the second main body portion 2213 and the bending angle β of the second flange portion 2214 relative to the second main body portion 2213 are complementary angles.

[0256] By adopting the technical solution of this embodiment, the bending angle of the second flange portion 2214 relative to the second main body portion 2213 is small, and the bending difficulty of the first steel-aluminum composite plate 221 is small, which is conducive to improving the production efficiency of the box body 100.

[0257] In other embodiments of the present application, referring to FIG. 14 , 90°≤α≤110°.

[0258] By adopting the technical solution of this embodiment, the design of 90°≤α≤110° makes the second flange portion 2214 and the second main body portion 2213 vertical or nearly vertical, and the structure of the first steel-aluminum composite plate 221 is regular, which facilitates the connection between the first steel plate layer 2211 and the annular steel frame 102.

[0259] As an example, as shown in FIG. 14 , when the value of α is 90°, the second flange portion 2214 is bent 90° relative to the second main body portion 2213 , and the second flange portion 2214 is perpendicular to the second main body portion 2213 .

[0260] In some embodiments, the value of α may be, but is not limited to, 90° or any value between 90° and 180°. For example, the value of α may be, but is not limited to, 90°, 92°, 94°, 96°, 98°, 100°, 102°, 104°, 106°, 108°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, 175°, or 179°.

[0261] In some other embodiments of the present application, referring to FIG. 14 , at least a portion of the second flange portion 2214 is inserted into the receiving cavity 101 .

[0262] It can be understood that a portion of the second flange portion 2214 is inserted into the receiving cavity 101 , and another portion of the second flange portion 2214 is located outside the receiving cavity 101 , or the entire second flange portion 2214 is located inside the receiving cavity 101 .

[0263] By adopting the technical solution of this embodiment, the second flange portion 2214 is located in the receiving cavity 101, which can reduce the size of the box body 100 and help improve the volume energy density of the battery 1100; in addition, the second flange portion 2214 is located in the receiving cavity 101, which also facilitates the welding of the first steel plate layer 2211 of the second flange portion 2214 and the annular steel frame 102.

[0264] In other embodiments of the present application, referring to FIG. 14 , the first steel plate layer 2211 of the second flange portion 2214 abuts against the surface of the annular steel frame 102 facing the receiving cavity 101 .

[0265] It can be understood that the first steel plate layer 2211 of the second flange portion 2214 is inserted into the receiving cavity 101 , and the first steel plate layer 2211 abuts against the side wall surface of the receiving cavity 101 .

[0266] By adopting the technical solution of this embodiment, the first steel plate layer 2211 of the second flange portion 2214 abuts against the surface of the annular steel frame 102 facing the accommodating cavity 101, which is beneficial to improving the welding quality and welding reliability after welding and improving the structural reliability of the box body 100.

[0267] In some other embodiments of the present application, referring to FIG. 15 , the angle between the second flange portion 2214 and the second main body portion 2213 is α, where 0°≤α<90°.

[0268] It can be understood that the bending angle β of the second flange portion 2214 relative to the second main body portion 2213 is greater than 90°, so that the first steel plate layer 2211 can form a double-layer structure after bending, and the first aluminum plate layer 2212 is located in the double-layer structure, and the first steel plate layer 2211 can better cover the first aluminum plate layer 2212.

[0269] By adopting the technical solution of this embodiment, the first steel plate layer 2211 can better cover the first aluminum plate layer 2212, and the first steel plate layer 2211 can better protect the first aluminum plate layer 2212, reducing the impact of the high temperature of welding the first steel plate layer 2211 and the annular steel frame 102 on the first aluminum plate layer 2212, which is conducive to improving the welding quality.

[0270] In other embodiments of the present application, referring to FIG. 15 , 0°≤α≤10°.

[0271] By adopting the technical solution of this embodiment, the design of 0°≤α≤10° makes the second flange portion 2214 parallel or nearly parallel to the second main body portion 2213, and the first aluminum plate layer 2212 is located within the double-layer structure formed by the bending of the first steel plate layer 2211. In this way, even if the first steel plate layer 2211 is affected by the high temperature of welding, the first aluminum plate layer 2212 is still located between the two first steel plate layers 2211 after melting, thereby reducing welding defects and improving the connection reliability of the first steel-aluminum composite plate 221 and the annular steel frame 102. reliability; in addition, the double-layer structure formed by bending the first steel plate layer 2211 is welded to the annular steel frame 102, so that the first steel-aluminum composite plate 221 does not need to use a complicated process to peel off the first aluminum plate layer 2212 in the welding area, which simplifies the manufacturing process, is conducive to improving production efficiency and reducing production costs; at the same time, the first steel plate layer 2211 is bent to form a double-layer structure, which has good structural strength, is conducive to improving the connection strength between the first steel plate layer 2211 and the annular steel frame 102, and improving the overall strength and reliability of the box body 100.

[0272] In this case, the first steel plate layer 2211 and the annular steel frame 102 can be welded by resistance spot welding or arc welding with a higher welding temperature. The resistance spot welding or arc welding has simple welding operations and low welding costs, which is conducive to reducing the production cost of the box body 100.

[0273] As an example, as shown in FIG. 15 , when the value of α is 0°, the second flange portion 2214 is bent 180° relative to the second main body portion 2213 , and the second flange portion 2214 covers the edge of the second main body portion 2213 .

[0274] In some embodiments, the value of α may be, but is not limited to, 0° or any value between 0° and 90°. For example, the value of α may be, but is not limited to, 0°, 2°, 4°, 6°, 8°, 10°, 12°, 14°, 16°, 18°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, or 89°.

[0275] In other embodiments of the present application, as shown in Figure 15, the second flange portion 2214 abuts against the end surface of the annular steel frame 102 facing the plate 20, or the second main body portion 2213 abuts against the end surface of the annular steel frame 102 facing the plate 20.

[0276] In a possible embodiment, referring to Figure 15, the second flange portion 2214 abuts against the end face of the annular steel frame 102 facing the plate 20. It can be understood that the second flange portion 2214 is located between the second main body portion 2213 and the annular steel frame 102, and the second flange portion 2214 abuts against the annular steel frame 102 to facilitate welding of the first steel plate layer 2211 and the annular steel frame 102.

[0277] In another possible embodiment, the second main body portion 2213 abuts against the end face of the annular steel frame 102 facing the plate 20. It can be understood that the second main body portion 2213 is located between the second flange portion 2214 and the annular steel frame 102, and the second main body portion 2213 abuts against the annular steel frame 102 to facilitate welding of the first steel plate layer 2211 and the annular steel frame 102.

[0278] By adopting the technical solution of this embodiment, the first steel plate layer 2211 can be welded to the annular steel frame 102 from the outside of the box body 100. The welding operation is simple, which is conducive to improving the assembly efficiency of the box body 100. In addition, the welding method of the first steel plate composite plate and the annular steel frame 102 can be flexibly set to meet different needs.

[0279] In other embodiments of the present application, referring to Figures 14 and 15, the second flange portion 2214 includes a bending section 22141 and a flange section 22142, and the bending section 22141 is connected between the flange section 22142 and the second main body portion 2213; the first steel plate layer 2211 of the bending section 22141 is welded to the annular steel frame 102.

[0280] The bending section 22141 may refer to the bent portion in the second flange portion 2214 , that is, the bent portion in the first steel-aluminum composite plate 221 , the portion where the second flange portion 2214 is bent relative to the second main body portion 2213 , and the bending section 22141 is connected between the flange section 22142 and the second main body portion 2213 .

[0281] As an example, referring to Figures 14 and 15, the first steel-aluminum composite plate 221 is divided into the second main body 2213 and the bending section 22141 at the place where the second flange portion 2214 starts to bend relative to the second main body 2213. The place where the second flange portion 2214 starts to bend relative to the second main body 2213 can be referred to the dotted line a in Figures 14 and 15, that is, the second main body 2213 and the bending section 22141 are divided by the dotted line a; the first steel-aluminum composite plate 221 is divided into the bending section 22141 and the flange section 22142 at the place where the second flange portion 2214 ends bending relative to the second main body 2213. The place where the second flange portion 2214 ends bending relative to the second main body 2213 can be referred to the dotted line b in Figures 14 and 15, that is, the bending section 22141 and the flange section 22142 are divided by the dotted line b. The shape of the bending section 22141 can be of various types, such as a circular arc, an elliptical arc, etc.

[0282] As shown in FIG. 14 , the shape of the bending section 22141 is a quarter arc, so that the value of α is 90°.

[0283] As shown in FIG. 15 , the shape of the bending section 22141 is a half-circle arc, so that the value of α is 0°.

[0284] By adopting the technical solution of this embodiment, the welding operation between the bending section 22141 and the annular steel frame 102 is easy. In addition, the bending section 22141 also has a large welding area, which is beneficial to improving the welding reliability of the first steel plate layer 2211 and the annular steel frame 102.

[0285] In other embodiments of the present application, referring to FIG. 9 and FIG. 16 , the plate 20 further includes a heat conducting plate 222 , and the first steel-aluminum composite plate 221 and the heat conducting plate 222 are stacked and enclosed to form a heat exchange channel 201 for the flow of heat exchange medium.

[0286] The heat conducting plate 222 and the first steel-aluminum composite plate 221 are stacked along the thickness direction of the first steel-aluminum composite plate 221 . The heat conducting plate 222 can be located on the side of the first steel-aluminum composite plate 221 facing the receiving cavity 101 , or on the side of the first steel-aluminum composite plate 221 facing away from the receiving cavity 101 .

[0287] The heat conducting plate 222 and the first steel-aluminum composite plate 221 enclose a heat exchange channel 201 for the flow of heat exchange medium. It is understood that the heat conducting plate 222 is recessed away from the first steel-aluminum composite plate 221 to form the heat exchange channel 201, or the first steel-aluminum composite plate 221 is recessed away from the heat conducting plate 222 to form the heat exchange channel 201; or the heat conducting plate 222 is recessed away from the first steel-aluminum composite plate 221, and the first steel-aluminum composite plate 221 is also recessed away from the heat conducting plate 222 to form the heat exchange channel 201. Here, "recessed" can refer to removing part of the material to form a groove structure, and can also refer to forming the groove structure by stamping or other methods.

[0288] Heat exchange channel 201 may refer to a channel within plate 20 for the flow of a heat exchange medium. As the heat exchange medium flows through heat exchange channel 201, it exchanges heat with the battery cells 200, thereby achieving thermal management of the battery cells 200. This allows the battery cells 200 to operate within an appropriate temperature range, improving the charge and discharge performance and reliability of the battery cells 200. When the temperature of the heat exchange medium is higher than that of the battery cells 200, the heat exchange medium heats the battery cells 200. When the temperature of the heat exchange medium is lower than that of the battery cells 200, the heat exchange medium removes heat from the battery cells 200, cooling them, thereby achieving thermal management of the battery cells 200. The heat exchange medium may be air, water, coolant, or the like.

[0289] By adopting the technical solution of this embodiment, the plate 20 has a thermal management function and can be used as a heat exchanger. The box body 100 does not need to be additionally provided with a heat exchanger, which is beneficial to reducing the number of parts of the box body 100, improving assembly efficiency, and also improving the integration of the battery 1100; in addition, the battery cell 200 can directly exchange heat with the plate 20, thereby improving the heat exchange effect.

[0290] In other embodiments of the present application, referring to FIG. 9 , FIG. 12 , FIG. 16 and FIG. 17 , the heat conducting plate 222 includes at least one of an aluminum plate 2221 and a second steel-aluminum composite plate 2222 .

[0291] The second steel-aluminum composite plate 2222 may refer to a composite plate formed by compositing a steel plate and an aluminum plate 2221 . The compositing method of the first steel-aluminum composite plate 221 may be the same as or different from the compositing method of the second steel-aluminum composite plate 2222 .

[0292] In a possible embodiment, referring to Figures 9 and 16, the heat conducting plate 222 includes an aluminum plate 2221, and the aluminum plate 2221 is stacked with the first steel-aluminum composite plate 221. The aluminum plate 2221 and the first steel-aluminum composite plate 221 are surrounded by a heat exchange channel 201. In this way, the aluminum plate 2221 and the first aluminum plate layer 2212 have good thermal conductivity to improve the heat exchange efficiency of the plate 20, and the first steel plate layer 2211 has good structural strength to improve the structural strength of the box 100. At the same time, the first steel plate layer 2211 can also be welded to the annular steel frame 102, which reduces the number of bolts used in the box 100, improves assembly efficiency, and is also conducive to increasing the sealing performance of the box 100.

[0293] As an example, referring to Figures 9 and 16, the aluminum plate 2221 can be located on the side of the first aluminum plate layer 2212 facing the receiving cavity 101, so that the battery cell 200 can realize heat exchange between the heat exchange medium and the battery cell 200 through the aluminum plate 2221. The aluminum plate 2221 has good thermal conductivity, which is beneficial to improving the heat exchange effect of the battery cell 200, thereby improving the charging and discharging performance of the battery cell 200, and is also beneficial to realizing a higher rate of charging and discharging of the battery 1100.

[0294] In another possible embodiment, referring to Figures 12 and 17, the heat conducting plate 222 includes a second steel-aluminum composite plate 2222, and the second steel-aluminum composite plate 2222 and the first steel-aluminum composite plate 221 are arranged to form a heat exchange channel 201. The first aluminum plate layer 2212 and the second aluminum plate layer 22222 in the second steel-aluminum composite plate 2222 have good thermal conductivity to improve the heat exchange efficiency of the plate 20. The first steel plate layer 2211 and the second steel plate layer 22221 have good structural strength to better improve the structural strength of the box 100. At the same time, the first steel plate layer 2211 can also be welded to the annular steel frame 102, thereby reducing the number of parts of the box 100, improving assembly efficiency, and also helping to increase the sealing performance of the box 100.

[0295] As an example, referring to Figures 12 and 17, the second steel-aluminum composite plate 2222 is located on the side of the first steel-aluminum composite plate 221 facing the receiving cavity 101. Of course, in other examples, the second steel-aluminum composite plate 2222 can also be located on the side of the first steel-aluminum composite plate 221 facing away from the receiving cavity 101.

[0296] In another possible embodiment, the heat conducting plate 222 includes an aluminum plate 2221 and a second steel-aluminum composite plate 2222 , and the performance of the aluminum plate 2221 and the second steel-aluminum composite plate 2222 can be simultaneously utilized to increase the thermal conductivity and structural strength of the plate 20 .

[0297] As an example, the aluminum plate 2221 is located between the first steel-aluminum composite plate 221 and the second steel-aluminum composite plate 2222; or, the second steel-aluminum composite plate 2222 is located between the aluminum plate 2221 and the first steel-aluminum composite plate 221; or, the first steel-aluminum composite plate 221 is located between the aluminum plate 2221 and the second steel-aluminum composite plate 2222.

[0298] By adopting the technical solution of this embodiment, the plate 20 can be flexibly configured to meet the usage requirements of different batteries 1100.

[0299] In other embodiments of the present application, referring to Figures 9, 12, 16 and 17, when the heat conducting plate 222 includes an aluminum plate 2221, the first aluminum plate layer 2212 is located between the aluminum plate 2221 and the first steel plate layer 2211, and the aluminum plate 2221 is connected to the first aluminum plate layer 2212; when the heat conducting plate 222 includes a second steel-aluminum composite plate 2222, the second steel-aluminum composite plate 2222 includes a stacked second steel plate layer 22221 and a second aluminum plate layer 22222, the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are located between the first steel plate layer 2211 and the second steel plate layer 22221, and the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are connected.

[0300] In a possible embodiment, referring to Figures 9 and 16, when the heat conducting plate 222 includes an aluminum plate 2221, the first aluminum plate layer 2212 is located between the aluminum plate 2221 and the first steel plate layer 2211, and the aluminum plate 2221 is connected to the first aluminum plate layer 2212. It can be understood that the aluminum plate 2221 is covered on the first aluminum plate layer 2212, and the aluminum plate 2221 is adjacent to the first aluminum plate layer 2212 to facilitate the connection between the first aluminum plate layer 2212 and the aluminum plate 2221.

[0301] The aluminum plate 2221 and the first aluminum plate layer 2212 are arranged close to each other, and the materials of the aluminum plate 2221 and the first aluminum plate layer 2212 are the same or similar. The connection method between the first aluminum plate layer 2212 and the aluminum plate 2221 is simple and the connection reliability is good; for example, the first aluminum plate layer 2212 and the aluminum plate 2221 are connected by brazing. The brazing welding temperature is low and the impact on the first aluminum plate layer 2212 and the aluminum plate 2221 is small, which is beneficial to improving the welding quality of the first aluminum plate layer 2212 and the aluminum plate 2221 and reducing the risk of leakage of the heat exchange medium.

[0302] In another possible embodiment, referring to FIG12 and FIG17, when the heat conducting plate 222 includes a second steel-aluminum composite plate 2222, the second steel-aluminum composite plate 2222 includes a second steel plate layer 22221 and a second aluminum plate layer 22222 stacked, the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are located between the first steel plate layer 2211 and the second steel plate layer 22221; the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are connected; it can be understood that the first steel-aluminum composite plate 221 and the second steel-aluminum composite plate 2222 are stacked. The first steel-aluminum composite plate 221 and the second steel-aluminum composite plate 2222 are stacked along the thickness direction of the first steel-aluminum composite plate 221. The second steel-aluminum composite plate 2222 includes a second steel plate layer 22221 and a second aluminum plate layer 22222. The first steel plate layer 2211, the first aluminum plate layer 2212, the second aluminum plate layer 22222, and the second steel plate layer 22221 are stacked along the thickness direction of the first steel-aluminum composite plate 221, and the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are located between the first steel plate layer 2211 and the second steel plate layer 22221. The first steel-aluminum composite plate 221 can be located on the side of the second steel-aluminum composite plate 2222 facing the receiving cavity 101, or the first steel-aluminum composite plate 221 can be located on the side of the second steel-aluminum composite plate 2222 facing away from the receiving cavity 101.

[0303] The stacking of the first steel-aluminum composite plate 221 and the second steel-aluminum composite plate 2222 increases the structural strength of the plate 20, thereby improving the structural strength of the battery 1100. Furthermore, the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are located between the first steel plate layer 2211 and the second steel plate layer 22221. This allows the first aluminum plate layer 2212 and the second aluminum plate layer 22222 to remain located between the first steel plate layer 2211 and the second steel plate layer 22221 even when the first steel plate layer 2211 and the annular steel frame 102 are welded using a higher-temperature welding method, such as resistance spot welding or arc welding, to reduce welding costs.

[0304] The first aluminum plate layer 2212 and the second aluminum plate layer 22222 are arranged close to each other, and the materials of the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are the same or similar. The connection method between the first aluminum plate layer 2212 and the second aluminum plate layer 22222 is simple, and the connection reliability is good; for example, the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are connected by brazing, and the brazing welding temperature is low, and the impact on the first aluminum plate layer 2212 and the second aluminum plate layer 22222 is small, which is beneficial to improving the welding quality of the first aluminum plate layer 2212 and the second aluminum plate layer 22222 and reducing the risk of leakage of the heat exchange medium.

[0305] By adopting the technical solution of this embodiment, the aluminum plate 2221 and the first aluminum plate layer 2212 are arranged close to each other, and the materials of the aluminum plate 2221 and the first aluminum plate layer 2212 are the same or similar. The connection method between the first aluminum plate layer 2212 and the aluminum plate 2221 is simple and the connection reliability is good; in addition, the first steel-aluminum composite plate 221 and the second steel-aluminum composite plate 2222 are stacked, which can increase the structural strength of the plate 20 to improve the structural strength of the battery 1100; and the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are located between the first steel plate layer 2211 and the second steel plate layer 22221, which facilitates the welding of the first steel plate layer 2211 and the annular steel frame 102.

[0306] In other embodiments of the present application, referring to FIG. 12 , when the heat conducting plate 222 includes a second steel-aluminum composite plate 2222 , edges of the first steel-aluminum composite plate 221 and edges of the second steel-aluminum composite plate 2222 overlap to form an overlapping area 202 , and the overlapping area 202 is welded to the annular steel frame 102 .

[0307] The double-layer steel-aluminum composite plate structure formed by the edge of the second steel-aluminum composite plate 2222 covering the edge of the first steel-aluminum composite plate 221 is the overlapping area 202 .

[0308] By adopting the technical solution of this embodiment, the first aluminum plate layer 2212 and the second aluminum plate layer 22222 in the overlap area 202 are located between the first steel plate layer 2211 and the second steel plate layer 22221. In this way, even if the first steel plate layer 2211 and the annular steel frame 102 are welded using a welding method with a higher welding temperature, the first aluminum plate layer 2212 and the second aluminum plate layer 22222 can still be located between the first steel plate layer 2211 and the second steel plate layer 22221 after melting, so as to reduce welding defects and improve welding reliability.

[0309] In other embodiments of the present application, as shown in FIG. 11 , the edge of the first steel-aluminum composite plate 221 protrudes from the heat conducting plate 222 to form a protrusion 2215 , and the first steel plate layer 2211 of the protrusion 2215 is connected to the annular steel frame 102 .

[0310] The protrusion 2215 may refer to the portion of the first steel-aluminum composite plate 221 that protrudes from the heat conducting plate 222 , that is, the size of the first steel-aluminum composite plate 221 is larger than the size of the heat conducting plate 222 , and the portion of the first steel-aluminum composite plate 221 not covered by the heat conducting plate 222 is the protrusion 2215 .

[0311] As an example, the edge of the heat conducting plate 222 is flush with the edge of the first aluminum plate layer 2212 , and the uncovered area 22112 of the first steel plate layer 2211 may also be referred to as a protrusion 2215 .

[0312] By adopting the technical solution of this embodiment, the first steel plate layer 2211 of the protrusion 2215 is welded to the annular steel frame 102, so that the welding position of the first steel plate layer 2211 is at a certain distance from the heat conducting plate 222, which can reduce the impact of the welding temperature on the heat conducting plate 222 and is conducive to improving the reliability of welding.

[0313] In some cases, the structural strength of the heat exchange component is weak, and the box body 100 is provided with a protective member (for example, a bottom support plate) to protect the heat exchange component and reduce the risk of leakage of the heat exchange medium.

[0314] In some other embodiments of the present application, referring to FIG. 12 , the heat conducting plate 222 is located on a side of the first steel-aluminum composite plate 221 close to the receiving cavity 101 .

[0315] By adopting the technical solution of this embodiment, the first steel-aluminum composite plate 221 has good structural strength. The first steel-aluminum composite plate 221 is located outside the box 100, which can eliminate protective parts, reduce the number of parts of the box 100, and improve assembly efficiency.

[0316] In other embodiments of the present application, referring to FIG. 16 and FIG. 17 , the heat conducting plate 222 is a flat plate structure, and the first steel-aluminum composite plate 221 is recessed away from the heat conducting plate 222 to form a heat exchange channel 201 .

[0317] The heat conducting plate 222 adopts a flat plate structure with a smooth surface, which can provide good support for the battery cell 200 and can also fully contact the battery cell 200 to improve the heat exchange effect; the first steel-aluminum composite plate 221 is recessed toward the heat conducting plate 222 to form a recessed space. This recessed space cooperates with the flat plate to form a heat exchange channel 201, and the recessed space also directly provides flow space for heat exchange.

[0318] By adopting the technical solution of this embodiment, the battery cell 200 is supported on the flat plate structure, and the support stability and reliability of the battery cell 200 are good. In addition, the heat exchange area between the battery cell 200 and the flat plate structure is large, and the heat exchange effect of the battery cell 200 is good, which is beneficial to improving the performance of the battery 1100.

[0319] In other embodiments of the present application, referring to FIG. 3 and FIG. 16 , the box body 100 further includes a seat beam 300 for connecting the entire vehicle seat, and the seat beam 300 is connected to the first steel-aluminum composite panel 221 .

[0320] The seat beam 300 may refer to a component for installing a seat in the vehicle 1000. The seat beam 300 may be connected to the first steel-aluminum composite panel 221 by welding, clamping, bonding, screwing, or the like.

[0321] By adopting the technical solution of this embodiment, the first steel-aluminum composite panel 221 has good structural strength and can be used as a mounting base for the seat beam 300, so that the seat beam 300 is integrated with the panel 20 of the battery 1100, which is beneficial to improving the integration of the vehicle 1000 and reducing the production cost of the vehicle 1000.

[0322] As an example, the seat beam 300 is welded to the first steel plate layer 2211; the first steel plate layer 2211 is located between the first aluminum plate layer 2212 and the seat beam 300 to facilitate welding to the seat beam 300. In other examples, the first aluminum plate layer 2212 may be located on the side of the first steel plate layer 2211 facing the seat beam 300, and the first steel plate layer 2211 is stripped of aluminum in the area where it is welded to the seat beam 300, thereby facilitating welding of the first steel plate layer 2211 to the seat beam 300.

[0323] In some cases, the seat beam 300 is made of steel, so that the seat beam 300 has good structural strength to achieve stable mounting of the seat and also enables the seat beam 300 to be welded to the first steel plate layer 2211.

[0324] By adopting the technical solution of this embodiment, the seat beam 300 is welded to the first steel plate layer 2211 , which can reduce the number of bolts used and improve the assembly efficiency of the vehicle 1000 .

[0325] The present application is described below with reference to some embodiments.

[0326] Example 1

[0327] In this embodiment, referring to Figure 3, the box body 100 includes an annular frame 10 and a plate 20. The annular frame 10 is surrounded by a receiving cavity 101; at least one side opening of the receiving cavity 101 is covered with the plate 20; wherein, the annular frame 10 is formed by bending a border strip 111, and one end of the border strip 111 is sealed and connected to the other end of the border strip 111.

[0328] In this embodiment, the plate 20 covers the upper opening of the receiving cavity 101 .

[0329] Example 2

[0330] The difference between this embodiment and the first embodiment is that, as shown in FIG. 4 to FIG. 6 , the plate 20 covers the upper opening of the receiving cavity 101 .

[0331] In this embodiment, the border strip 111 is roll-bent to form the annular frame 10 .

[0332] In this embodiment, one end of the frame bar 111 is welded to the other end of the frame bar 111 .

[0333] In this embodiment, the annular frame 10 includes a plurality of straight segments 121 and a plurality of arc segments 122 . The plurality of straight segments 121 are arranged around the receiving cavity 101 , and an arc segment 122 connects two adjacent straight segments 121 .

[0334] In this embodiment, the arc segment 122 is a circular arc segment.

[0335] In this embodiment, the frame strip 111 is hollow inside and surrounds a hollow cavity 1111 .

[0336] In this embodiment, the frame strip 111 includes a bending plate 1112 , and the bending plate 1112 is bent to form a hollow cavity 1111 .

[0337] In this embodiment, the bending plate 1112 is roll-bent to form the hollow cavity 1111 .

[0338] In this embodiment, the bending plate 1112 includes a bending starting portion 11121, a bending portion 11122 and a bending ending portion 11123 which are connected to each other, and the bending starting portion 11121 is fixedly connected to the bending ending portion 11123.

[0339] In this embodiment, the bending starting portion 11121 and the bending ending portion 11123 are fixedly connected.

[0340] Example 3

[0341] The difference between this embodiment and the second embodiment is that: as shown in FIG. 7 , the bending start portion 11121 and the bending end portion 11123 are fixedly overlapped.

[0342] In this embodiment, the annular frame 10 includes an annular main body 131 and a first connecting portion 132 connected to the annular main body 131. The annular main body 131 is arranged to form a receiving cavity 101. The first connecting portion 132 is located on the side of the annular main body 131 facing away from the receiving cavity 101. The edge of the plate 20 is covered by the end of the first connecting portion 132 away from the annular main body 131.

[0343] In this embodiment, the edge of the plate 20 is bent to form a first main portion 211 and a first flange portion 212 , and the end of the first connecting portion 132 away from the annular body 131 is located between the first main portion 211 and the first flange portion 212 .

[0344] In this embodiment, the box body 100 further includes a seal 30 , one side of which overlaps the surface of the first flange portion 212 facing away from the first main body portion 211 ; the other side of the seal 30 overlaps the surface of the annular body 131 facing away from the accommodating cavity 101 .

[0345] In this embodiment, the portion of the bending starting portion 11121 that protrudes from the bending portion 11122 facing away from the receiving cavity 101 forms the first connecting portion 132 , and the bending portion 11122 and the bending starting portion 11121 form the annular main body 131 .

[0346] Example 4

[0347] The difference between this embodiment and the third embodiment is that, as shown in FIG. 8 , the other side of the sealing member 30 overlaps the surface of the first connecting portion 132 facing away from the first main body portion 211 .

[0348] Example 5

[0349] The difference between this embodiment and the second embodiment is that, as shown in FIG9 , FIG10 and FIG16 , the frame strip 111 is hollow inside and surrounds a plurality of hollow cavities 1111 .

[0350] In this embodiment, the bending starting portion 11121 is fixedly connected to the bending portion 11122 , and the bending ending portion 11123 is fixedly connected to the bending portion 11122 .

[0351] In this embodiment, the annular frame 10 includes an annular main body 131 and a second connecting portion 133 connected to the annular main body 131. The annular main body 131 surrounds a receiving cavity 101, and the second connecting portion 133 is located on the side of the annular main body 131 facing the receiving cavity 101; the edge of the plate 20 is connected to the second connecting portion 133.

[0352] In this embodiment, the portion of the bending starting portion 11121 that protrudes from the bending portion 11122 toward the receiving cavity 101 forms the second connecting portion 133 , and the bending portion 11122 and the bending starting portion 11121 form the annular main body 131 .

[0353] In this embodiment, the edge of the plate 20 abuts against the surface of the second connecting portion 133 facing the receiving cavity 101 .

[0354] In this embodiment, the annular frame 10 is an annular steel frame 102 , and the plate 20 includes a first steel-aluminum composite plate 221 . The first steel-aluminum composite plate 221 includes a first steel plate layer 2211 and a first aluminum plate layer 2212 stacked together. The first steel plate layer 2211 is welded to the annular steel frame 102 .

[0355] In this embodiment, the plate 20 further includes a heat conducting plate 222 . The first steel-aluminum composite plate 221 and the heat conducting plate 222 are stacked and enclosed to form a heat exchange channel 201 for the heat exchange medium to flow.

[0356] In this embodiment, the heat conducting plate 222 is an aluminum plate 2221 , the first aluminum plate layer 2212 is located between the aluminum plate 2221 and the first steel plate layer 2211 , and the aluminum plate 2221 is connected to the first aluminum plate layer 2212 .

[0357] In this embodiment, the heat conducting plate 222 is located on a side of the first steel-aluminum composite plate 221 close to the receiving cavity 101 .

[0358] In this embodiment, the heat conducting plate 222 is a flat plate structure, and the first steel-aluminum composite plate 221 is recessed toward the back of the heat conducting plate 222 to form a heat exchange channel 201 .

[0359] Example 6

[0360] The difference between this embodiment and the fifth embodiment is that: as shown in Figures 11 and 16, the first steel plate layer 2211 includes a covering area 22111 and an uncovered area 22112 connected to the covering area 22111, the first aluminum plate layer 2212 covers the covering area 22111, and the uncovered area 22112 is welded to the annular steel frame 102.

[0361] In this embodiment, the edge of the first steel-aluminum composite plate 221 protrudes from the heat conducting plate 222 to form a protruding portion 2215 , and the first steel plate layer 2211 of the protruding portion 2215 is connected to the annular steel frame 102 .

[0362] In this embodiment, the aluminum plate 2221 covers the first aluminum plate layer 2212 , the edge of the aluminum plate 2221 is flush with the edge of the first aluminum plate layer 2212 , and the uncovered area 22112 is the protrusion 2215 .

[0363] Example 7

[0364] The difference between this embodiment and the fifth embodiment is that: referring to Figures 12 and 17, the heat conducting plate 222 is a second steel-aluminum composite plate 2222, the second steel-aluminum composite plate 2222 includes a second steel plate layer 22221 and a second aluminum plate layer 22222 stacked, the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are located between the first steel plate layer 2211 and the second steel plate layer 22221, and the first aluminum plate layer 2212 and the second aluminum plate layer 22222 are connected.

[0365] In this embodiment, the edge of the first steel-aluminum composite plate 221 and the edge of the second steel-aluminum composite plate 2222 are overlapped to form an overlap area 202 , and the overlap area 202 is welded to the annular steel frame 102 .

[0366] Example 8

[0367] The difference between this embodiment and the second embodiment is that: as shown in Figures 13 and 14, the plate 20 is a first steel-aluminum composite plate 221, and the first steel-aluminum composite plate 221 includes a first steel plate layer 2211 and a first aluminum plate layer 2212 stacked together. The first steel plate layer 2211 is welded to the annular steel frame 102.

[0368] In this embodiment, the edge of the first steel-aluminum composite plate 221 is bent toward the first aluminum plate layer 2212 to form the second main body portion 2213 and the second flange portion 2214 of the first steel-aluminum composite plate 221; the first steel plate layer 2211 of the second flange portion 2214 is welded to the annular steel frame 102.

[0369] In this embodiment, the included angle between the second flange portion 2214 and the second main body portion 2213 is α, wherein 90°≤α<180°.

[0370] In this embodiment, 90°≤α≤110°.

[0371] In this embodiment, α=90°.

[0372] In this embodiment, at least a portion of the second flange portion 2214 is inserted into the receiving cavity 101 .

[0373] In this embodiment, the first steel plate layer 2211 of the second flange portion 2214 abuts against the surface of the annular steel frame 102 facing the receiving cavity 101 .

[0374] In this embodiment, the second flange portion 2214 includes a bending section 22141 and a flange section 22142 , the bending section 22141 is connected between the flange section 22142 and the second main body 2213 ; the first steel plate layer 2211 of the bending section 22141 is welded to the annular steel frame 102 .

[0375] Example 9

[0376] The difference between this embodiment and the eighth embodiment is that, as shown in FIG. 15 , the angle between the second flange portion 2214 and the second main body portion 2213 is α, where 0°≤α<90°.

[0377] In this embodiment, 0°≤α≤10°.

[0378] In this embodiment, α=90°.

[0379] In this embodiment, the second flange portion 2214 abuts against the end surface of the annular steel frame 102 facing the plate 20 .

[0380] In another embodiment of the present application, a battery 1100 is provided, comprising the housing 100 as described in the above embodiment.

[0381] In another embodiment of the present application, an electrical device is provided, comprising the battery 1100 as described in the above embodiment.

[0382] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0383] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A box, wherein: include, An annular frame is formed to form a receiving cavity; as well as a plate, at least one side opening of the receiving cavity being covered by the plate; The annular frame is formed by bending a frame bar, and one end of the frame bar is sealed and connected to the other end of the frame bar.

2. The housing according to claim 1, wherein: The border strips are roller-bent to form the annular frame.

3. The box according to claim 1 or 2, wherein: One end of the frame bar is welded to the other end of the frame bar.

4. The box according to any one of claims 1 to 3, wherein: The annular frame includes a plurality of straight segments and a plurality of arc segments. The plurality of straight segments are arranged around the receiving cavity, and the arc segments are connected between two adjacent straight segments.

5. The housing according to claim 4, wherein: The arc segment is a circular arc segment.

6. The housing according to claim 5, wherein: The radius of the inner wall surface of the arc segment is R, wherein 40 mm ≤ R ≤ 200 mm.

7. The housing according to claim 6, wherein: 60mm≤R≤120mm.

8. The box according to any one of claims 1 to 7, wherein: The frame strip is hollow inside and surrounds one or more hollow cavities.

9. The housing according to claim 8, wherein: The frame strip includes a bending plate, and the bending plate is bent to form the hollow cavity.

10. The housing according to claim 9, wherein: The bent plate is rolled to form the hollow cavity.

11. The housing according to claim 10, wherein: The bending plate includes a bending starting portion, a bending portion and a bending ending portion that are connected to each other, wherein the bending starting portion is fixedly connected to the bending ending portion; or, the bending starting portion is fixedly connected to the bending portion; or, the bending ending portion is fixedly connected to the bending portion.

12. The housing according to claim 11, wherein: When the bending start portion is connected to the bending end portion, the bending start portion and the bending end portion are fixedly connected; or, the bending start portion and the bending end portion are fixedly connected.

13. The box according to any one of claims 1 to 12, wherein: The annular frame includes an annular body and a first connecting portion connected to the annular body. The annular body surrounds the accommodating cavity. The first connecting portion is located on the side of the annular body facing away from the accommodating cavity. The edge of the plate is covered by the end of the first connecting portion away from the annular body.

14. The housing according to claim 13, wherein: The edge of the plate is bent to form a first main body portion and a first flange portion, and the end of the first connecting portion away from the annular body is located between the first main body portion and the first flange portion.

15. The housing according to claim 14, wherein: The box body also includes a seal, one side of which overlaps the surface of the first flange portion facing away from the first main body portion; the other side of the seal overlaps at least one of the surface of the annular body facing away from the accommodating cavity and the surface of the first connecting portion facing away from the first main body portion.

16. The box according to any one of claims 1 to 15, wherein: The annular frame includes an annular body and a second connecting portion connected to the annular body. The annular body surrounds the receiving cavity. The second connecting portion is located on the side of the annular body facing the receiving cavity. The edge of the plate is connected to the second connecting portion.

17. The housing according to claim 16, wherein: The edge of the plate abuts against a surface of the second connecting portion facing the receiving cavity.

18. The box according to any one of claims 1 to 17, wherein: The annular frame is an annular steel frame, and the plate member includes a first steel-aluminum composite plate, which includes a first steel plate layer and a first aluminum plate layer stacked together, and the first steel plate layer is welded to the annular steel frame.

19. The housing according to claim 18, wherein: The first steel plate layer includes a covering area and an uncovered area connected to the covering area. The first aluminum plate layer covers the covering area, and the uncovered area is welded to the annular steel frame.

20. The housing according to claim 18 or 19, wherein: The edge of the first steel-aluminum composite plate is bent toward the first aluminum plate layer, so that the first steel-aluminum composite plate forms a second main body portion and a second flange portion; The first steel plate layer of the second flange portion is welded to the annular steel frame; and / or the first steel plate layer of the second main body portion is welded to the annular steel frame.

21. The housing according to claim 20, wherein: An included angle between the second flange portion and the second main body portion is α, wherein 90°≤α<180°.

22. The housing according to claim 21, wherein: 90°≤α≤110°。 23. The housing according to claim 21 or 22, wherein: At least a portion of the second flange portion is inserted into the receiving cavity.

24. The housing according to claim 23, wherein: The first steel plate layer of the second flange portion abuts against a surface of the annular steel frame facing the receiving cavity.

25. The housing of claim 20, wherein: An included angle between the second flange portion and the second main body portion is α, wherein 0°≤α<90°.

26. The housing according to claim 25, wherein: 0°≤α≤10°。 27. A casing according to claim 25 or 26, wherein: The second flange portion abuts against the end surface of the annular steel frame facing the plate, or the second main body portion abuts against the end surface of the annular steel frame facing the plate.

28. The housing according to any one of claims 20 to 27, wherein: The second flanging portion includes a bending section and a flanging section, the bending section is connected between the flanging section and the second main body portion; the first steel plate layer of the bending section is welded to the annular steel frame.

29. The housing according to any one of claims 18 to 28, wherein: The plate component further includes a heat conducting plate, and the first steel-aluminum composite plate and the heat conducting plate are stacked and enclosed to form a heat exchange channel for the flow of heat exchange medium.

30. The housing of claim 29, wherein: The heat conducting plate includes at least one of an aluminum plate and a second steel-aluminum composite plate.

31. The housing of claim 30, wherein: In the case where the heat conducting plate comprises an aluminum plate, the first aluminum plate layer is located between the aluminum plate and the first steel plate layer, and the aluminum plate is connected to the first aluminum plate layer; In the case where the heat conducting plate includes the second steel-aluminum composite plate, the second steel-aluminum composite plate includes a second steel plate layer and a second aluminum plate layer stacked together, the first aluminum plate layer and the second aluminum plate layer are located between the first steel plate layer and the second steel plate layer, and the first aluminum plate layer and the second aluminum plate layer are connected.

32. A casing according to claim 30 or 31, wherein: When the heat conducting plate includes the second steel-aluminum composite plate, edges of the first steel-aluminum composite plate and the second steel-aluminum composite plate overlap to form an overlapping area, and the overlapping area is welded to the annular steel frame.

33. The housing according to any one of claims 29 to 32, wherein: The edge of the first steel-aluminum composite plate protrudes from the heat conducting plate to form a protruding portion, and the first steel plate layer of the protruding portion is connected to the annular steel frame.

34. The housing according to any one of claims 29 to 33, wherein: The heat conducting plate is located on a side of the first steel-aluminum composite plate close to the receiving cavity.

35. The housing according to any one of claims 29 to 34, wherein: The heat conducting plate is a flat plate structure, and the first steel-aluminum composite plate is recessed toward the back of the heat conducting plate to form the heat exchange channel.

36. A battery, wherein: A box comprising the box according to any one of claims 1 to 35.

37. An electrical device, wherein: Including the battery of claim 36.

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