Case, battery and electric device

Abstract

Disclosed in the present application are a case, a battery and an electric device. The case comprises a steel frame and a panel assembly, wherein the steel frame creates an enclosure to form an accommodating cavity and a first opening communicating with the accommodating cavity; the panel assembly covers the first opening, and the panel assembly comprises a first steel-aluminum composite panel; and the first steel-aluminum composite panel comprises a first steel panel layer and a first aluminum panel layer, which are stacked, with the first steel panel layer being welded to the steel frame.

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 202410256693.4 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 field of battery technology, 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 typically includes a case and battery cells. The battery cells are installed in the case, and the case protects the battery cells. However, the case has many parts, takes a long time to assemble, and has low assembly efficiency.

[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, including but not limited to solving the problems of the box having a large number of parts, a long assembly time and low assembly efficiency in the related art.

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

[0009] In a first aspect, a box body is provided, which includes a steel frame and a plate assembly, the steel frame enclosing a receiving cavity and a first opening connected to the receiving cavity; the plate assembly covers the first opening, and the plate assembly 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 steel frame.

[0010] The box body of the embodiment of the present application includes a steel frame and a plate assembly, and the plate assembly covers the first opening of the frame to achieve the closure of the first opening; the plate assembly includes a first steel-aluminum composite plate, and the first steel-aluminum composite plate includes a first steel plate layer and a first aluminum plate layer that are stacked, and the first steel plate layer and the steel frame are both made of steel. Therefore, the first steel plate layer can be welded to the steel frame, which can reduce the use of bolts in the connection between the plate assembly and the steel frame, and even eliminate the bolts, thereby reducing the number of parts of the box body and improving the assembly efficiency of the box body; in addition, the welding connection between the first steel plate layer and the steel frame is efficient, which can also reduce the assembly time of the box body and improve the assembly efficiency of the box body.

[0011] In some embodiments, the plate assembly further includes a plate member, and the plate member and the first steel-aluminum composite plate are stacked and enclosed to form a heat exchange channel for the flow of heat exchange medium.

[0012] By adopting the technical solution of this embodiment, the plate assembly has a thermal management function and can be used as a heat exchange component. The box body does not need to be additionally provided with a heat exchange component, which is beneficial to reducing the number of parts of the box body, improving assembly efficiency, and also improving the integration of the battery; in addition, the battery cell can directly exchange heat with the plate assembly through the first opening, thereby improving the heat exchange effect.

[0013] In some embodiments, the panel comprises at least one of an aluminum panel and a second steel-aluminum composite panel.

[0014] By adopting the technical solution of this embodiment, the plate assembly can be flexibly arranged to meet different battery usage requirements.

[0015] In some embodiments, when the plate component 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 brazed to the first aluminum plate layer; when the plate component 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.

[0016] By adopting the technical solution of this embodiment, the aluminum plate and the first aluminum plate layer are welded by brazing, the welding quality is good, the sealing performance of the plate assembly is good, and the risk of leakage of the heat exchange medium is small; 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 assembly 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 steel frame.

[0017] In some embodiments, when the panel comprises a second steel-aluminum composite panel, edges of the first steel-aluminum composite panel and the second steel-aluminum composite panel overlap to form an overlapping area, and the overlapping area is welded to the steel frame.

[0018] 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 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.

[0019] In some embodiments, the first aluminum sheet layer and the second aluminum sheet layer are brazed.

[0020] By adopting the technical solution of this embodiment, the first aluminum plate layer and the second aluminum plate layer are welded by brazing, the welding quality is good, the sealing performance of the plate assembly is good, and the leakage risk of the heat exchange medium is small.

[0021] In some embodiments, the plate member is located on a side of the first steel-aluminum composite plate close to the receiving cavity.

[0022] 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.

[0023] In some embodiments, the plate is a flat plate structure, and the first steel-aluminum composite plate is recessed toward the back of the plate to form a heat exchange channel.

[0024] 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.

[0025] In some embodiments, the plate has a thickness ranging from 0.3 mm to 3 mm.

[0026] By adopting the technical solution of this embodiment, the thickness of the plate is in the range of 0.3 mm to 3 mm, so that the plate can better balance the structural strength and production cost.

[0027] In some embodiments, the plate has a thickness ranging from 0.5 mm to 1.5 mm.

[0028] By adopting the technical solution of this embodiment, the thickness of the plate is in the range of 0.5 mm to 1.5 mm, so that the plate can better balance the structural strength and production cost.

[0029] In some embodiments, the edge of the first steel-aluminum composite panel protrudes from the panel to form a protruding portion, and the first steel plate layer of the protruding portion is welded to the steel frame.

[0030] By adopting the technical solution of this embodiment, the edge of the first steel-aluminum composite plate is exposed, which facilitates the welding of the first steel plate layer and the steel frame.

[0031] In some embodiments, the box further includes a heat exchange tube for allowing a heat exchange medium to flow, and the heat exchange tube is connected to the first steel-aluminum composite plate.

[0032] By adopting the technical solution of this embodiment, the first steel-aluminum composite plate is used as the installation base of the heat exchange tube. The first steel-aluminum composite plate has good structural strength and the heat exchange tube has good installation stability, which is conducive to improving the reliability of the box.

[0033] In some embodiments, the heat exchange tube is an aluminum tube, the first aluminum plate layer is located between the aluminum tube and the first steel plate layer, and the aluminum tube and the first aluminum plate layer are welded.

[0034] By adopting the technical solution of this embodiment, the aluminum tube can be welded to the first aluminum plate layer. The connection operation of the aluminum tube and the first steel-aluminum composite plate is simple, the integration difficulty is small, and it is beneficial to reduce the production cost of the box.

[0035] In some embodiments, the aluminum tube is brazed to the first aluminum sheet layer.

[0036] By adopting the technical solution of this embodiment, the aluminum tube and the first aluminum plate layer are welded by brazing, the welding quality is good, the sealing performance of the aluminum tube is good, and the leakage risk of the heat exchange medium is small.

[0037] In some embodiments, a heat exchange tube is provided on a side of the first steel-aluminum composite plate facing away from the receiving cavity and / or on a side facing the receiving cavity.

[0038] By adopting the technical solution of this embodiment, the installation position of the heat exchange tube can be flexible to meet the use requirements of different batteries.

[0039] In some embodiments, when the heat exchange tube is located on the side of the first steel-aluminum composite plate facing away from the receiving cavity, the heat exchange tube is bent to form a hollow area, and the first steel-aluminum composite plate is provided with a convex portion, which is located in the hollow area; when the heat exchange tube is located on the side of the first steel-aluminum composite plate facing the receiving cavity, the first steel-aluminum composite plate is provided with a groove, and at least part of the heat exchange tube is located in the groove.

[0040] By adopting the technical solution of this embodiment, the protrusion is inserted into the hollow area, and the protrusion can play a positioning role for the heat exchange tube, thereby facilitating the assembly of the first steel-aluminum composite plate and the heat exchange tube; the groove can accommodate the heat exchange tube, which can reduce the height of the heat exchange tube extending into the accommodating cavity, thereby facilitating the installation of the battery cell.

[0041] In some embodiments, the steel frame and the first steel plate layer are laser welded, resistance spot welded, or arc welded.

[0042] By adopting the technical solution of this embodiment, laser welding is adopted between the steel frame and the first steel plate layer. The laser welding has good welding quality and good welding reliability between the first steel plate layer and the steel frame, which is beneficial to improving the reliability of battery use; resistance spot welding or arc welding is adopted between the steel frame and the first steel plate layer. The resistance spot welding has low welding cost, which is beneficial to reducing the production cost of the box.

[0043] In some embodiments, the steel frame and the first steel plate layer are laser welded with filler wire.

[0044] Through the technical solution of this embodiment, filling material (wire) can be filled between the steel frame and the first steel plate layer, and the steel frame and the first steel plate layer can be welded by melting the filling material using a laser beam. In this way, a filling material with a lower melting point can be selected to lower the welding temperature, reduce the impact on the first aluminum plate layer, and improve the reliability of welding.

[0045] In some embodiments, 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 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 to the steel frame.

[0047] In some embodiments, the steel frame includes a frame body and a connecting portion connected to each other. The frame body is arranged to form a receiving cavity. The connecting portion is located on the side of the frame body facing the receiving cavity. The connecting portion is welded to the first steel plate layer.

[0048] By adopting the technical solution of this embodiment, the connecting part is located on the side of the frame facing the receiving cavity, so that the welding equipment can be installed in the receiving cavity to reduce the difficulty of welding the connecting part and the first aluminum plate layer and improve welding efficiency.

[0049] In some embodiments, the edge of the first steel-aluminum composite plate is overlapped at the connecting portion, and the edge of the first steel-aluminum composite plate is welded to the connecting portion.

[0050] By adopting the technical solution of this embodiment, the edges of the first steel-aluminum composite plate are overlapped at the connecting portion to form a multi-layer structure. The welding reliability between the first steel plate layer of the first steel-aluminum composite plate and the connecting portion is good, which is beneficial to improving the sealing and structural reliability of the box.

[0051] In some embodiments, the end of the connecting portion facing away from the frame is welded to the edge of the first steel plate layer, and / or the middle portion of the connecting portion is welded to the edge of the first steel plate layer.

[0052] By adopting the technical solution of this embodiment, the welding position of the connecting portion and the first steel plate layer can be flexibly set to meet different battery usage requirements.

[0053] In some embodiments, an edge of the first steel-aluminum composite plate abuts against a surface of the connecting portion facing the receiving cavity.

[0054] By adopting the technical solution of this embodiment, after the battery cell is placed in the receiving cavity, the first steel-aluminum composite plate supports the battery cell, and the edge of the first steel-aluminum composite plate abuts the surface of the connecting portion facing the receiving cavity, so that the connecting portion can support the first steel-aluminum composite plate and reduce the stress on the welding structure between the first steel plate layer and the connecting portion. The connection reliability between the first steel plate layer and the connecting portion is good, the structural strength of the box is good, and it is beneficial to improve the reliability of the battery.

[0055] In some embodiments, an edge of the first steel-aluminum composite panel abuts against an end surface of the steel frame located on the same side as the first opening.

[0056] By adopting the technical solution of this embodiment, the first steel plate layer can be welded to the steel frame from the outside of the steel frame, and the welding operation is simple.

[0057] In some embodiments, a periphery of the first steel plate layer is welded to the steel frame.

[0058] By adopting the technical solution of this embodiment, the entire periphery of the first steel plate layer and the steel frame can obtain an annular welded structure, which can improve the sealing performance of the box at the first opening; in addition, there is no need to set other sealing structures at the first opening, which is conducive to improving the assembly efficiency of the box.

[0059] In some embodiments, the thickness of the first steel plate layer is greater than the thickness of the first aluminum plate layer.

[0060] By adopting the technical solution of this embodiment, the thickness of the first steel plate layer is greater than the thickness of the first aluminum plate layer. The first steel plate layer is thicker, and the structural strength of the first steel-aluminum composite plate is good, which is beneficial to improving the structural strength of the box and also facilitates the integration of other components on the first steel-aluminum composite plate to improve the integration of electrical devices or batteries.

[0061] In some embodiments, the thickness of the first steel plate layer ranges from 0.3 mm to 3 mm.

[0062] By adopting the technical solution of this embodiment, the thickness of the first steel plate layer ranges from 0.3 mm to 3 mm, so that the first steel-aluminum composite plate can better balance the structural strength and production cost of the first steel-aluminum composite plate.

[0063] In some embodiments, the thickness of the first steel plate layer ranges from 0.5 mm to 2 mm.

[0064] By adopting the technical solution of this embodiment, the thickness of the first steel plate layer ranges from 0.5 mm to 2 mm, so that the first steel-aluminum composite plate can better balance the structural strength and production cost of the first steel-aluminum composite plate.

[0065] In some embodiments, the thickness of the first aluminum plate layer ranges from 0.02 mm to 1 mm.

[0066] By adopting the technical solution of this embodiment, the thickness of the first aluminum plate layer ranges from 0.02 mm to 1 mm, so that the first steel-aluminum composite plate can better take into account the weight and production cost of the first steel-aluminum composite plate.

[0067] In some embodiments, the thickness of the first aluminum plate layer ranges from 0.05 mm to 0.3 mm.

[0068] By adopting the technical solution of this embodiment, the thickness of the first aluminum plate layer ranges from 0.05 mm to 0.3 mm, so that the first steel-aluminum composite plate can better take into account the weight and production cost of the first steel-aluminum composite plate.

[0069] In some embodiments, 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 main body and a flange portion; the first steel plate layer of the flange portion is welded to the steel frame; and / or, the first steel plate layer of the main body is welded to the steel frame.

[0070] 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 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 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 steel frame.

[0071] In some embodiments, the angle between the flange portion and the main body portion is α, wherein 90°≤α<180°.

[0072] By adopting the technical solution of this embodiment, the bending angle of the flange portion relative to the 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 body.

[0073] In some embodiments, 90°≤α≤110°.

[0074] By adopting the technical solution of this embodiment, the design of 90°≤α≤110° allows the flange portion and the 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 steel frame.

[0075] In some embodiments, at least a portion of the flange portion is inserted into the receiving cavity.

[0076] By adopting the technical solution of this embodiment, the 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 flange portion is located in the receiving cavity, which also facilitates the welding of the first steel plate layer of the flange portion and the steel frame.

[0077] In some embodiments, the first steel plate layer of the flange portion abuts against the surface of the steel frame facing the receiving cavity.

[0078] By adopting the technical solution of this embodiment, the first steel plate layer of the flange portion abuts against the surface of the steel frame facing the receiving cavity, which is beneficial to improving the welding quality and welding reliability after welding and improving the structural reliability of the box.

[0079] In some embodiments, the angle between the flange portion and the main body portion is α, where 0°≤α<90°.

[0080] 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 can better protect the first aluminum plate layer, reducing the impact of the high temperature of welding the first steel plate layer and the steel frame on the first aluminum plate layer, which is conducive to improving the welding quality.

[0081] In some embodiments, 0°≤α≤10°.

[0082] By adopting the technical solution of this embodiment, the design of 0°≤α≤10° makes the flange portion parallel or nearly parallel to the 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 steel frame; in addition, the double-layer structure formed by the bending of the first steel plate layer is welded to the steel roll-pressed 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 steel frame, and improving the overall strength and reliability of the box.

[0083] In some embodiments, the flanging portion includes a bending section and a flanging section, the bending section is connected between the flanging section and the main body; the first steel plate layer of the bending section is welded to the steel frame.

[0084] By adopting the technical solution of this embodiment, the welding operation of the bending section and the 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 steel frame.

[0085] In some embodiments, the box body also includes a connecting beam located in the receiving cavity, and the connecting beam is connected to the first steel-aluminum composite plate by fasteners; or, the connecting beam is located on the side of the first steel plate layer facing away from the first aluminum plate layer, and the connecting beam is welded to the first steel plate layer; or, the plate assembly also includes a second steel-aluminum composite plate, and the second steel-aluminum composite plate is located between the connecting beam and the first steel-aluminum composite plate, and the second steel-aluminum composite plate includes a second steel plate layer and a second aluminum plate layer stacked together, 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, and the second steel plate layer is welded to the connecting beam.

[0086] By adopting the technical solution of this embodiment, the connection method between the connecting beam and the first steel-aluminum composite plate is flexible to meet the usage requirements of different batteries.

[0087] In some embodiments, the box body further includes a connecting beam located in the receiving cavity, a heat exchange area is formed on the surface of the plate assembly facing the connecting beam, and a projection of the connecting beam on the plane where the heat exchange area is located is staggered with the heat exchange area.

[0088] By adopting the technical solution of this embodiment, the projection of the connecting beam on the plane where the heat exchange zone is located is staggered with the heat exchange zone, so that the connecting beam does not occupy the space corresponding to the heat exchange zone for installing battery cells, so that the box can accommodate more battery cells for installation, thereby increasing the number of battery cells in the battery and improving the energy density of the battery.

[0089] In some embodiments, the top panel of the enclosure and / or the bottom panel of the enclosure comprise a panel assembly.

[0090] By adopting the technical solution of this embodiment, the plate assembly is used as the top plate and / or bottom plate of the box, which can increase the structural strength of the box and is also conducive to integrating the first steel-aluminum composite plate with other components to reduce the use of bolts and improve the assembly efficiency of the box.

[0091] In a second aspect, a battery is provided, comprising the box body as described in the above embodiment.

[0092] The battery of the embodiment of the present application adopts the above-mentioned box body, which has high assembly efficiency and is conducive to reducing the production cost of the battery.

[0093] In some embodiments, the battery further includes a mounting member for mounting the battery, and the mounting member is connected to the first steel-aluminum composite plate.

[0094] By adopting the technical solution of this embodiment, the mounting part is connected to the first steel-aluminum composite plate, so that the mounting part and the first steel-aluminum composite plate are integrated, which is beneficial to improving the integration of the battery; in addition, the first steel-aluminum composite plate has a large area, and the mounting parts can be flexibly arranged to improve the mounting reliability of the battery.

[0095] In some embodiments, the first steel plate layer is welded to the mounting component.

[0096] By adopting the technical solution of this embodiment, the first steel plate layer is welded to the mounting part, which can reduce the use of bolts, reduce the number of parts, and improve the assembly efficiency of the battery.

[0097] In some embodiments, the battery further includes a seat beam for connecting a seat of the entire vehicle, and the seat beam is connected to the first steel-aluminum composite panel.

[0098] By adopting the technical solution of this embodiment, the first steel-aluminum composite plate has good structural strength and can be used as a mounting base for the seat beam, so that the seat beam and the battery plate assembly are integrated, which is conducive to improving the integration of the battery.

[0099] In some embodiments, the seat beam is welded to the first steel sheet layer.

[0100] By adopting the technical solution of this embodiment, the seat beam is welded to the first steel plate layer, which can reduce the number of bolts used and improve the assembly efficiency of the vehicle.

[0101] In a third aspect, an electrical device is provided, comprising the battery as described in the above embodiment.

[0102] The electrical device of the embodiment of the present application uses the above-mentioned battery, and the manufacturing cost of the battery is low, which helps to reduce the manufacturing cost of the electrical device.

[0103] In some embodiments, the electrical device is a vehicle, and the first steel-aluminum composite panel forms a floor of the vehicle.

[0104] By adopting the technical solution of this embodiment, the first steel-aluminum composite plate has good structural strength and can be used directly as the floor of the vehicle. This eliminates the need for an additional floor, helps reduce vehicle parts, improves the structural compactness and integration of the vehicle, and reduces the manufacturing cost of the vehicle.

[0105] 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

[0106] 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.

[0107] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0108] FIG2 is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application.

[0109] FIG3 is a schematic diagram of the exploded structure of a box provided in some embodiments of the present application.

[0110] FIG4 is a schematic structural diagram of the box shown in FIG3 .

[0111] FIG5 is a cross-sectional view taken along line AA in FIG4 .

[0112] FIG6 is a partial enlarged view of point C in FIG5 .

[0113] FIG7 is a schematic diagram of the exploded structure of a plate assembly provided in some embodiments of the present application.

[0114] FIG8 is a schematic diagram of the exploded structure of the plate assembly provided in some other embodiments of the present application.

[0115] FIG9 is a schematic structural diagram of a box provided in some other embodiments of the present application.

[0116] FIG10 is a cross-sectional view taken along line DD in FIG9 .

[0117] FIG11 is a partial enlarged view of point E in FIG10 .

[0118] FIG12 is a partial enlarged view of the box provided in some other embodiments of the present application at point E in FIG10 .

[0119] FIG13 is a partial enlarged view of the box provided in some other embodiments of the present application at point E in FIG10 .

[0120] FIG14 is a schematic structural diagram of a plate assembly provided in some other embodiments of the present application.

[0121] FIG15 is a cross-sectional view taken along line FF in FIG14 .

[0122] FIG16 is a partial enlarged view of point H in FIG15 .

[0123] FIG17 is a structural diagram of a box provided in some other embodiments of the present application from one perspective.

[0124] FIG18 is a schematic structural diagram of the box shown in FIG17 from another perspective.

[0125] FIG19 is a cross-sectional view taken along line II in FIG18 .

[0126] FIG20 is a partial enlarged view of point J in FIG19 .

[0127] FIG21 is a schematic structural diagram of a stamping basin provided in some other embodiments of the present application.

[0128] FIG22 is a schematic structural diagram of a box provided in some other embodiments of the present application.

[0129] FIG23 is a cross-sectional view taken along line KK in FIG22 .

[0130] FIG24 is a partial enlarged view of point M in FIG23 .

[0131] FIG25 is a partial enlarged view of the box provided in some other embodiments of the present application at point M in FIG23 .

[0132] FIG26 is a cross-sectional view taken along line BB in FIG4 .

[0133] FIG27 is a partial enlarged view of point N in FIG26 .

[0134] FIG28 is a partial enlarged view of the box provided in some other embodiments of the present application at position N in FIG26 .

[0135] FIG29 is a partial enlarged view of the box provided in some other embodiments of the present application at position N in FIG26 .

[0136] FIG30 is a schematic structural diagram of a stamping basin of a box provided in some other embodiments of the present application.

[0137] FIG31 is a cross-sectional view taken along line OO in FIG30.

[0138] FIG32 is a schematic diagram of the structure of batteries provided in some other embodiments of the present application.

[0139] Among them, the reference numerals in the figures are:

[0140] 1000, vehicle; 1100, battery; 1200, controller; 1300, motor; 100, housing; 110, first housing; 120, second housing; 130, plate assembly; 131, first steel-aluminum composite panel; 1311, first steel plate layer; 13111, uncovered area; 13112, covered area; 1312, first aluminum plate layer; 1313, main body; 1314, flange portion; 13141, bending section; 13142, flange portion; 1315, convex portion; 1316, groove; 132, plate; 1321, aluminum plate; 13 22. Second steel-aluminum composite panel; 13221. Second steel plate layer; 13222. Second aluminum plate layer; 133. Heat exchange channel; 134. Protrusion; 135. Heat exchange area; 136. Overlap area; 137. Heat exchange tube; 1371. Hollow area; 140. Steel frame; 141. Frame; 142. Connecting portion; 1401. Accommodating cavity; 1402. First opening; 150. Stamping basin; 160. Connecting beam; 161. Bending plate; 170. Mounting part; 180. Welding structure; 190. Fastener; 200. Battery cell; 300. Seat beam. DETAILED DESCRIPTION

[0141] 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.

[0142] 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.

[0143] 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.

[0144] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least some embodiments 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] A battery usually includes a box body and battery cells. The battery cells are installed in the box body, and the box body protects the battery cells. The box body usually includes a steel frame and a plate assembly. The plate assembly cover is provided at the opening of the steel frame to achieve the closure of the steel frame opening. However, the plate assembly is made of aluminum material, and the steel frame is made of steel material. Due to the different thermal expansion coefficients of aluminum and steel, the thermal expansion is uneven during welding, which is prone to cracks, deformation and other problems. Therefore, bolts are usually used to connect the plate assembly and the steel frame. In order to achieve a stable connection and a better sealing effect between the plate assembly and the steel frame, the bolts need to be distributed around the opening of the steel frame. With this arrangement, a large number of bolts are required, the assembly time of the box is long, and the assembly efficiency of the box is low.

[0162] Based on this, an embodiment of the present application provides a box body. Since the first steel plate layer and the steel frame of the first steel-aluminum composite plate in the plate assembly of the box body are both made of steel, 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 plate assembly and the steel frame, or even eliminate bolts, thereby reducing the number of parts of the box body and improving the assembly efficiency of the box body.

[0163] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0164] Electrical devices may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, electric tools, and the like. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices. Batteries may also be energy storage devices. Energy storage devices include energy storage containers, energy storage cabinets, and the like.

[0165] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0166] Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application.

[0167] 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.

[0168] 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.

[0169] Please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the exploded structure of a battery 1100 provided in some embodiments of the present application. Figure 3 is a schematic diagram of the exploded structure of a box 100 provided in some embodiments of the present application.

[0170] In some embodiments, the battery 1100 includes a housing 100 and battery cells 200, with the battery cells 200 housed within the housing 100. The housing 100 is used to provide a storage space for the battery cells 200 and can have various structures. In some embodiments, the housing 100 can include a first housing 110 and a second housing 120, which cover each other and together define a storage space for the battery cells 200.

[0171] As shown in FIG. 2 , the first box body 110 and the second box body 120 may also be hollow structures with one side open, and the open side of the first box body 110 covers the open side of the second box body 120 .

[0172] 3 , the second box body 120 may be a hollow structure with one end open, and the first box body 110 may be a plate-like structure. The first box body 110 covers the open side of the second box body 120 so that the first box body 110 and the second box body 120 jointly define a storage space.

[0173] Of course, the box body 100 formed by the first box body 110 and the second box body 120 can be in various shapes, such as a cylinder, a cuboid, etc.

[0174] 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.

[0175] 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.

[0176] Each battery cell 200 may be a secondary battery or a primary battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 200 may be cylindrical, flat, rectangular, or in other shapes.

[0177] Please refer to Figures 4 to 6. Figure 4 is a schematic structural diagram of the box 100 shown in Figure 3. Figure 5 is a cross-sectional view along line AA in Figure 4. Figure 6 is a partial enlarged view of point C in Figure 8.

[0178] In some embodiments of the present application, a box body 100 is provided, which includes a steel frame 140 and a plate assembly 130, wherein the steel frame 140 is arranged to form a receiving cavity 1401 and a first opening 1402 connected to the receiving cavity 1401; the plate assembly 130 covers the first opening 1402, and the plate assembly 130 includes a first steel-aluminum composite plate 131; the first steel-aluminum composite plate 131 includes a first steel plate layer 1311 and a first aluminum plate layer 1312 arranged in a stacked manner, and the first steel plate layer 1311 is welded to the steel frame 140.

[0179] The steel frame 140 may refer to the side of the box 100. The steel frame 140 may also form the peripheral wall of the receiving cavity 1401. The steel frame 140 may be formed by a plurality of frame bars connected end to end to form a circular frame, the interior space of the circular frame forming the receiving cavity 1401. The frame bars may refer to the side walls of one side of the receiving cavity 1401. Openings are formed on opposite sides of the steel frame 140, one of which is a first opening 1402. The frame bars may be plates, profiles, etc., and the cross-sectional shape of the frame bars may be, but is not limited to, L-shaped, Z-shaped, or a hollow structure with a hollow interior.

[0180] In the box body 100 shown in FIG. 3 , the steel frame 140 includes four frame bars, which are connected end to end and enclosed to form a rectangular frame. The space enclosed by the rectangular frame is the receiving cavity 1401 .

[0181] When the box body 100 only includes the second box body 120, and the second box body 120 is a hollow structure with an opening at one end, the plate assembly 130 may refer to the bottom plate of the second box body 120 arranged opposite to its opening, and the steel frame 140 may refer to the surrounding side walls of the second box body 120, and the space enclosed by the second box body 120 is the accommodating cavity 1401.

[0182] When the box body 100 includes a first box body 110 and a second box body 120, the first box body 110 is a plate-like structure, and the second box body 120 is a hollow structure with an opening at one end, the steel frame 140 may refer to the surrounding side wall of the second box body 120; the plate assembly 130 may refer to the first box body 110, or may refer to the bottom plate of the second box body 120 arranged opposite to its opening, and the space enclosed by the second box body 120 is the accommodating cavity 1401.

[0183] When the box body 100 includes a first box body 110 and a second box body 120, and both the first box body 110 and the second box body 120 are hollow structures with an opening on one side, the steel frame 140 may refer to the peripheral side wall of the second box body 120, and the plate assembly 130 may refer to the first box body 110 or the bottom plate of the second box body 120 arranged opposite to its opening, and the space enclosed by the second box body 120 is the accommodating cavity 1401.

[0184] The plate assembly 130 may refer to a component covering the first opening 1402, and the plate assembly 130 may close the first opening 1402; the plate assembly 130 includes a first steel-aluminum composite plate 131, the first steel-aluminum composite plate 131 covers the first opening 1402, the first steel-aluminum composite plate 131 includes a first steel plate layer 1311 and a first aluminum plate layer 1312, and the first steel plate layer 1311 and the first aluminum plate layer 1312 are stacked; the first steel plate layer 1311 is located on the side of the first steel-aluminum composite plate 131 close to the receiving cavity 1401, or the first aluminum plate layer 1312 is located on the side of the first steel-aluminum composite plate 131 close to the receiving cavity 1401.

[0185] The first steel-aluminum composite plate 131 may be a composite plate formed by cladding a steel plate with an aluminum plate. The cladding process for the steel and aluminum plates may include, but is not limited to, explosive cladding, explosive rolling cladding, or rolling cladding. For example, after cleaning, the steel and aluminum plates are conveyed to a rolling machine via a conveyor mechanism for rolling cladding. The plates then undergo diffusion heat treatment, leveling, finish rolling, stamping, and inspection to ultimately form the first steel-aluminum composite plate 131. The steel plate forms the first steel plate layer 1311 of the first steel-aluminum composite plate 131, and the aluminum plate forms the first aluminum plate layer 1312 of the first steel-aluminum composite plate 131. Of course, the number of first steel plate layers 1311 in the first steel-aluminum composite panel 131 can be one, two, three or more than four, and the number of first aluminum plate layers 1312 can also be one, two, three or more than four; as an example, the first steel-aluminum composite panel 131 includes two first steel plate layers 1311 and one first aluminum plate layer 1312, and the first aluminum plate layer 1312 is located between the two first steel plate layers 1311 to facilitate welding of the first steel plate layer 1311 to the steel frame 140.

[0186] The number of plate assemblies 130 can be two, and the two plate assemblies 130 respectively cover the openings on opposite sides of the steel frame 140 to obtain a closed box 100; of course, the number of plate assemblies 130 can be one, and the plate assembly 130 is covered at the first opening 1402 of the steel frame 140, and the opening on the other side of the steel frame 140 is covered with other plate structures.

[0187] The first steel plate layer 1311 is welded to the steel frame 140 . The first steel plate layer 1311 and the steel frame 140 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.

[0188] The box body 100 of the embodiment of the present application includes a steel frame 140 and a plate assembly 130. The plate assembly 130 covers the first opening 1402 of the frame to achieve the closure of the first opening 1402; the plate assembly 130 includes a first steel-aluminum composite plate 131. The first steel-aluminum composite plate 131 includes a first steel plate layer 1311 and a first aluminum plate layer 1312 that are stacked. The first steel plate layer 1311 and the steel frame 140 are both made of steel. Therefore, the first steel plate layer 1311 can be welded to the steel frame 140. This can reduce the use of bolts in the connection between the plate assembly 130 and the steel frame 140, and even eliminate bolts, thereby reducing the number of parts of the box body 100 and improving the assembly efficiency of the box body 100; in addition, the welding connection between the first steel plate layer 1311 and the steel frame 140 is efficient, which reduces the assembly time of the box body 100 and improves the assembly efficiency of the box body 100.

[0189] In addition, the first steel-aluminum composite plate 131 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.

[0190] In some cases, the plate assembly 130 and the steel frame 140 are connected by bolts, and the bolts are sealed by coating a whole circle with sealant or using sealing foam. This sealing method is complicated, and the sealing interfaces between the bolts and the plate assembly 130 and the bolts and the steel frame 140 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 1311 and the steel frame 140 are connected by welding. The connection interface between the first steel plate layer 1311 and the steel frame 140 is simple, the welding seal is simple, and the sealing effect is good.

[0191] In other embodiments of the present application, referring to FIG. 3 and FIG. 6 , the periphery of the first steel plate layer 1311 is welded to the steel frame 140 .

[0192] The periphery of the first steel plate layer 1311 may refer to an edge portion of the first steel plate layer 1311 away from the center thereof.

[0193] As an example, as shown in FIG3 , the four edges of the first steel plate layer 1311 are respectively welded to the four frame bars to form an annular welded structure 180. The annular welded structure 180 is disposed around the first steel plate layer 1311 to seal the first opening 1402. The welded structure 180 may be a weld point, a weld seam, or other structure.

[0194] By adopting the technical solution of this embodiment, the entire periphery of the first steel plate layer 1311 and the steel frame 140 can obtain an annular welded structure 180, which can improve the sealing performance of the box body 100 at the first opening 1402; in addition, there is no need to set other sealing structures at the first opening 1402, which is conducive to improving the assembly efficiency of the box body 100.

[0195] In some embodiments, an edge portion on one side of the first steel plate layer 1311 is welded to a corresponding frame strip, or two opposite edges or two adjacent edges of the first steel plate layer 1311 are welded to a corresponding frame strip.

[0196] Please refer to Figures 7 to 16. Figure 7 is a schematic diagram of the decomposed structure of the plate assembly 130 provided in some embodiments of the present application. Figure 8 is a schematic diagram of the decomposed structure of the plate assembly 130 provided in other embodiments of the present application. Figure 9 is a schematic diagram of the structure of the box 100 provided in some other embodiments of the present application. Figure 10 is a sectional view along the DD line in Figure 9. Figure 11 is a partial enlarged view of point E in Figure 10. Figure 12 is a partial enlarged view of point E in Figure 10 of the box 100 provided in some other embodiments of the present application. Figure 13 is a partial enlarged view of point E in Figure 10 of the box 100 provided in some other embodiments of the present application. Figure 14 is a schematic diagram of the structure of the plate assembly 130 provided in some other embodiments of the present application. Figure 15 is a sectional view along the FF line in Figure 14. Figure 16 is a partial enlarged view of point H in Figure 15.

[0197] In other embodiments of the present application, referring to FIG. 7 or FIG. 8 , the plate assembly 130 further includes a plate member 132 , and the plate member 132 and the first steel-aluminum composite plate 131 are stacked and enclosed to form a heat exchange channel 133 for the flow of heat exchange medium.

[0198] The plate 132 and the first steel-aluminum composite plate 131 are stacked along the thickness direction of the first steel-aluminum composite plate 131 . The plate 132 can be located on the side of the first steel-aluminum composite plate 131 facing the receiving cavity 1401 , or on the side of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401 .

[0199] The plate 132 and the first steel-aluminum composite plate 131 enclose a heat exchange channel 133 for the flow of a heat exchange medium. It is understood that the plate 132 is recessed away from the first steel-aluminum composite plate 131 to form the heat exchange channel 133, or the first steel-aluminum composite plate 131 is recessed away from the plate 132 to form the heat exchange channel 133; or the plate 132 is recessed away from the first steel-aluminum composite plate 131, and the first steel-aluminum composite plate 131 is also recessed away from the plate 132 to form the heat exchange channel 133. "Recessed" can refer to removing some material to form a recessed structure, or can refer to forming the recessed structure by stamping or other methods.

[0200] The heat exchange channel 133 may refer to a channel within the plate assembly 130 for the flow of a heat exchange medium. As the heat exchange medium flows through the heat exchange channel 133, 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.

[0201] By adopting the technical solution of this embodiment, the plate assembly 130 has a thermal management function and can be used as a heat exchange component. The box body 100 does not need to be additionally provided with a heat exchange component, 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 assembly 130 through the first opening 1402, thereby improving the heat exchange effect.

[0202] In some other embodiments of the present application, referring to FIG. 7 or FIG. 8 , the plate 132 includes at least one of an aluminum plate 1321 and a second steel-aluminum composite plate 1322 .

[0203] The second steel-aluminum composite plate 1322 may be a composite plate formed by compositing a steel plate and an aluminum plate 1321 . The compositing method of the first steel-aluminum composite plate 131 and the compositing method of the second steel-aluminum composite plate 1322 may be the same or different.

[0204] In one possible embodiment, the plate 132 includes an aluminum plate 1321, and the aluminum plate 1321 is stacked with the first steel-aluminum composite plate 131. The aluminum plate 1321 and the first steel-aluminum composite plate 131 are surrounded by a heat exchange channel 133. In this way, the aluminum plate 1321 and the first aluminum plate layer 1312 have good thermal conductivity to improve the heat exchange efficiency of the plate assembly 130, and the first steel plate layer 1311 has good structural strength to improve the structural strength of the box 100. At the same time, the first steel plate layer 1311 can also be welded to the steel frame 140, reducing the number of bolts used in the box 100, improving assembly efficiency, and also helping to increase the sealing performance of the box 100.

[0205] As an example, the aluminum plate 1321 can be located on the side of the first aluminum plate layer 1312 facing the receiving cavity 1401, so that the battery cell 200 can realize heat exchange between the heat exchange medium and the battery cell 200 through the aluminum plate 1321. The aluminum plate 1321 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.

[0206] In another possible embodiment, the plate 132 includes a second steel-aluminum composite plate 1322, and the second steel-aluminum composite plate 1322 and the first steel-aluminum composite plate 131 are arranged to form a heat exchange channel 133. The first aluminum plate layer 1312 and the second aluminum plate layer 13222 in the second steel-aluminum composite plate 1322 have good thermal conductivity to improve the heat exchange efficiency of the plate assembly 130. The first steel plate layer 1311 and the second steel plate layer 13221 have good structural strength to better improve the structural strength of the box 100. At the same time, the first steel plate layer 1311 can also be welded to the steel frame 140, reducing the number of parts of the box 100, improving assembly efficiency, and also helping to increase the sealing performance of the box 100.

[0207] As an example, the second steel-aluminum composite plate 1322 is located on the side of the first steel-aluminum composite plate 131 facing the receiving cavity 1401 . Of course, in other examples, the second steel-aluminum composite plate 1322 may also be located on the side of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401 .

[0208] In another possible embodiment, the plate member 132 includes an aluminum plate 1321 and a second steel-aluminum composite plate 1322 , and the performance of the aluminum plate 1321 and the second steel-aluminum composite plate 1322 can be simultaneously utilized to increase the thermal conductivity and structural strength of the plate assembly 130 .

[0209] As an example, the aluminum plate 1321 is located between the first steel-aluminum composite plate 131 and the second steel-aluminum composite plate 1322; or, the second steel-aluminum composite plate 1322 is located between the aluminum plate 1321 and the first steel-aluminum composite plate 131; or, the first steel-aluminum composite plate 131 is located between the aluminum plate 1321 and the second steel-aluminum composite plate 1322.

[0210] By adopting the technical solution of this embodiment, the plate assembly 130 can be flexibly configured to meet different battery 1100 usage requirements.

[0211] In some cases, the box body 100 is provided with a heat exchanger for exchanging heat with the battery cell 200. The heat exchanger can be arranged at the first opening 1402 of the steel frame 140 and close the first opening 1402. The heat exchanger is usually made of aluminum so that the heat exchanger has good heat conduction efficiency. However, the heat exchanger made of aluminum and the steel frame 140 are usually connected by bolts. The number of bolts is large, the assembly time of the box body 100 is long, and the assembly efficiency is low.

[0212] In other embodiments of the present application, please refer to Figures 9 to 12. When the plate 132 includes an aluminum plate 1321, the first aluminum plate layer 1312 is located between the aluminum plate 1321 and the first steel plate layer 1311, and the aluminum plate 1321 is brazed to the first aluminum plate layer 1312; when the plate 132 includes a second steel-aluminum composite plate 1322, the second steel-aluminum composite plate 1322 includes a stacked second steel plate layer 13221 and a second aluminum plate layer 13222, and the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221; the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are connected.

[0213] Brazing refers to a welding method in which a brazing filler metal with a melting point lower than the melting point of the welded parts is heated together with the welded parts, causing the brazing filler metal to melt and fill the gap at the weld joint, thereby achieving a connection between the welded parts.

[0214] In one possible embodiment, when the plate 132 includes an aluminum plate 1321, the first aluminum plate layer 1312 is located between the aluminum plate 1321 and the first steel plate layer 1311, and the aluminum plate 1321 is brazed to the first aluminum plate layer 1312; it can be understood that the aluminum plate 1321 is covered on the first aluminum plate layer 1312, and the aluminum plate 1321 is adjacent to the first aluminum plate layer 1312 to facilitate the brazing of the first aluminum plate layer 1312 and the aluminum plate 1321; the first aluminum plate layer 1312 and the aluminum plate 1321 are connected by brazing, the brazing temperature is low, and the impact on the first aluminum plate layer 1312 and the aluminum plate 1321 is small, which is beneficial to improving the welding quality of the first aluminum plate layer 1312 and the aluminum plate 1321 and reducing the risk of leakage of the heat exchange medium.

[0215] In another possible embodiment, when the plate 132 includes a second steel-aluminum composite plate 1322, the second steel-aluminum composite plate 1322 includes a second steel plate layer 13221 and a second aluminum plate layer 13222 stacked, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221; the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are connected; it can be understood that the first steel-aluminum composite plate 131 and the second steel-aluminum composite plate 1322 are stacked, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221; A steel-aluminum composite plate 131 and a second steel-aluminum composite plate 1322 are stacked along the thickness direction of the first steel-aluminum composite plate 131. The second steel-aluminum composite plate includes a second steel plate layer 13221 and a second aluminum plate layer 13222. The first steel plate layer 1311, the first aluminum plate layer 1312, the second aluminum plate layer 13222, and the second steel plate layer 13221 are stacked along the thickness direction of the first steel-aluminum composite plate 131, and the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221. The first steel-aluminum composite plate 131 can be located on the side of the second steel-aluminum composite plate 1322 facing the receiving cavity 1401, or the first steel-aluminum composite plate 131 can be located on the side of the second steel-aluminum composite plate 1322 facing away from the receiving cavity 1401.

[0216] The stacking of first steel-aluminum composite plate 131 and second steel-aluminum composite plate 1322 increases the structural strength of plate assembly 130, thereby improving the structural strength of battery 1100. Furthermore, first aluminum plate layer 1312 and second aluminum plate layer 13222 are positioned between first steel plate layer 1311 and second steel plate layer 13221. This allows for even higher-temperature welding of first steel plate layer 1311 and steel frame 140. After melting, first aluminum plate layer 1312 and second aluminum plate layer 13222 remain positioned between first steel plate layer 1311 and second steel plate layer 13221, thereby reducing welding defects and improving welding reliability. Furthermore, first steel plate layer 1311 can be welded to steel frame 140 using higher-temperature welding methods, such as resistance spot welding and arc welding, to reduce welding costs.

[0217] By adopting the technical solution of this embodiment, the aluminum plate 1321 and the first aluminum plate layer 1312 are welded by brazing, the welding quality is good, the sealing performance of the plate assembly 130 is good, and the risk of leakage of the heat exchange medium is small; in addition, the first steel-aluminum composite plate 131 and the second steel-aluminum composite plate 1322 are stacked, which can increase the structural strength of the plate assembly 130, thereby improving the structural strength of the battery 1100; and the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221, which facilitates the welding of the first steel plate layer 1311 and the steel frame 140.

[0218] In some other embodiments of the present application, as shown in FIG12 , when the panel 132 includes a second steel-aluminum composite panel 1322 , edges of the first steel-aluminum composite panel 131 and edges of the second steel-aluminum composite panel 1322 overlap to form an overlap region 136 , and the overlap region 136 is welded to the steel frame 140 .

[0219] The double-layer steel-aluminum composite plate structure formed by the edge of the second steel-aluminum composite plate 1322 covering the edge of the first steel-aluminum composite plate 131 is the overlapping area 136 .

[0220] By adopting the technical solution of this embodiment, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 in the overlap area 136 are located between the first steel plate layer 1311 and the second steel plate layer 13221. In this way, even if the first steel plate layer 1311 and the steel frame 140 are welded using a welding method with a higher welding temperature, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 can still be located between the first steel plate layer 1311 and the second steel plate layer 13221 after melting, so as to reduce welding defects and improve welding reliability.

[0221] In some other embodiments of the present application, referring to FIG. 12 , when the plate 132 includes a second steel-aluminum composite plate 1322 , the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are brazed.

[0222] By adopting the technical solution of this embodiment, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are welded by brazing, the welding quality is good, the sealing performance of the plate assembly 130 is good, and the leakage risk of the heat exchange medium is small.

[0223] In some other embodiments of the present application, referring to FIG. 12 , the plate member 132 is located on a side of the first steel-aluminum composite plate 131 close to the receiving cavity 1401 .

[0224] 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.

[0225] By adopting the technical solution of this embodiment, the first steel-aluminum composite plate 131 has good structural strength. The first steel-aluminum composite plate 131 is located outside the box 100, which can eliminate protective parts, reduce the number of parts of the box 100, and improve assembly efficiency.

[0226] In other embodiments of the present application, referring to FIG. 7 and FIG. 8 , the plate 132 is a flat plate structure, and the first steel-aluminum composite plate 131 is recessed toward the plate 132 to form a heat exchange channel 133 .

[0227] The plate 132 adopts a flat plate structure with a smooth surface, which can provide good support for the battery 1100 cells and can also fully contact the battery 1100 cells to improve the heat exchange effect; the first steel-aluminum composite plate 131 is recessed toward the plate 132 to form a recessed space. This recessed space cooperates with the flat plate to form a heat exchange channel 133, and the recessed space also directly provides flow space for heat exchange.

[0228] By adopting the technical solution of this embodiment, the battery 1100 cell is supported on the flat plate structure, and the support stability and reliability of the battery 1100 cell are good. In addition, the heat exchange area between the battery 1100 cell and the flat plate structure is large, and the heat exchange effect of the battery 1100 cell is good, which is beneficial to improving the performance of the battery 1100.

[0229] In other embodiments of the present application, referring to Figures 11 to 13 , the thickness of the plate 132 ranges from 0.3 mm to 3 mm.

[0230] The thickness H3 of the plate 132 may refer to the distance between two opposing surfaces along the thickness direction of the plate 132. In the case where the plate 132 has a convex portion or a concave portion, the thickness of the plate 132 is measured based on the plane area.

[0231] When the plate 132 is an aluminum plate 1321, the plate thickness H3 of the plate 132 is the plate thickness of the aluminum plate 1321. When the plate 132 is a second steel-aluminum composite plate 1322, the plate thickness H3 of the plate 132 is the plate thickness of the second steel-aluminum composite plate 1322. The plate thickness of the second steel-aluminum composite plate 1322 is equal to the sum of the plate thickness H4 of the second steel plate layer 13221 and the plate thickness H5 of the second aluminum plate layer 13222.

[0232] It can be understood that 0.3mm≤H3≤3mm, where H3≥0.3mm, so that the plate 132 has a certain thickness, so that the plate 132 has a certain structural strength, reducing the risk of leakage of the heat exchange medium; H3≤3mm, so that the thickness of the plate 132 is not too large, causing material waste, which is beneficial to reducing the production cost of the box 100.

[0233] By adopting the technical solution of this embodiment, the thickness of the plate 132 ranges from 0.3 mm to 3 mm, so that the plate 132 can better balance the structural strength and the production cost.

[0234] In other embodiments of the present application, referring to Figures 13 to 15 , the thickness of the plate 132 ranges from 0.5 mm to 1.5 mm.

[0235] It can be understood that 0.5mm≤H3≤1.5mm, where H3≥0.5mm, so that the plate 132 has a suitable thickness, which can effectively reduce the leakage risk of the heat exchange channel 133; H3≤1.5mm, so that the plate 132 can better save materials and reduce production costs.

[0236] By adopting the technical solution of this embodiment, the thickness of the plate 132 ranges from 0.5 mm to 1.5 mm, so that the plate 132 can better balance structural strength and production cost.

[0237] In some embodiments, the value of the plate thickness H3 of the plate 132 can be, but is not limited to, 0.3 mm, 3 mm, or any number between 0.3 mm and 3 mm; for example: 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm.

[0238] In other embodiments of the present application, referring to Figures 14 to 16 , the edge of the first steel-aluminum composite plate 131 protrudes from the plate member 132 to form a protruding portion 134 , and the first steel plate layer 1311 of the protruding portion 134 is welded to the steel frame 140 .

[0239] The protrusion 134 may refer to a portion of the first steel-aluminum composite panel 131 protruding from the plate 132 , that is, the size of the first steel-aluminum composite panel 131 is larger than the size of the plate 132 , and the portion of the first steel-aluminum composite panel 131 not covered by the plate 132 is the protrusion 134 .

[0240] By adopting the technical solution of this embodiment, the first steel plate layer 1311 of the protrusion 134 is welded to the steel frame 140, so that there is a certain distance between the welding positions of the plate 132 and the first steel plate layer 1311, which can reduce the impact of the welding temperature on the plate 132 and is conducive to improving the reliability of welding.

[0241] Please refer to Figures 17 to 21. Figure 17 is a schematic structural diagram of a box body 100 provided in some other embodiments of the present application from one perspective. Figure 18 is a schematic structural diagram of the box body 100 shown in Figure 17 from another perspective. Figure 19 is a cross-sectional view taken along line II in Figure 18. Figure 20 is a partial enlarged view of point J in Figure 19. Figure 21 is a schematic structural diagram of a stamping basin 150 provided in some other embodiments of the present application.

[0242] In other embodiments of the present application, referring to Figures 17 to 20 , the housing 100 further includes a heat exchange tube 137 for allowing a heat exchange medium to flow, and the heat exchange tube 137 is connected to the first steel-aluminum composite plate 131 .

[0243] Heat exchange tube 137 may refer to a pipe for the flow of heat exchange medium. Heat exchange tube 137 may be a straight tube, a curved tube, a serpentine tube, etc., and the pipe may include, but is not limited to, a flat tube or a round tube. The specific shape and structure of heat exchange tube 137 can be determined based on the arrangement of the battery cells 1100 and the heat exchange requirements.

[0244] By adopting the technical solution of this embodiment, the first steel-aluminum composite plate 131 is used as the installation base of the heat exchange tube 137. The first steel-aluminum composite plate 131 has good structural strength and the heat exchange tube 137 has good installation stability, which is conducive to improving the reliability of the box body 100.

[0245] In other embodiments of the present application, referring to Figures 17 to 20, the heat exchange tube 137 is an aluminum tube, the first aluminum plate layer 1312 is located between the aluminum tube and the first steel plate layer 1311, and the aluminum tube and the first aluminum plate layer 1312 are welded.

[0246] By adopting the technical solution of this embodiment, the aluminum tube can be welded to the first aluminum plate layer 1312 , and the connection operation between the aluminum tube and the first steel-aluminum composite plate 131 is simple, and the integration difficulty is small, which is conducive to reducing the production cost of the box 100 .

[0247] In other embodiments of the present application, referring to Figures 17 to 20 , the aluminum tube and the first aluminum plate layer 1312 are brazed.

[0248] By adopting the technical solution of this embodiment, the aluminum tube and the first aluminum plate layer 1312 are welded by brazing, the welding quality is good, the sealing performance of the aluminum tube is good, and the leakage risk of the heat exchange medium is small.

[0249] In other embodiments of the present application, referring to Figures 20 and 21 , a heat exchange tube 137 is provided on a side of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401 and / or on a side facing the receiving cavity 1401 .

[0250] In one possible embodiment, a heat exchange tube 137 is provided on the side of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401. The first steel-aluminum composite plate 131 can separate the battery 1100 and the heat exchange tube 137, thereby reducing the risk of damage to the heat exchange tube 137 by the battery 1100 and improving the reliability of the box 100.

[0251] In another possible embodiment, a heat exchange tube 137 is provided on the side of the first steel-aluminum composite plate 131 facing the first steel-aluminum composite plate 131 , and the battery cells 1100 can directly contact and exchange heat with the battery cells 1100 , which is conducive to improving the heat exchange effect.

[0252] In another possible embodiment, heat exchange tubes 137 are provided on the side of the first steel-aluminum composite plate 131 facing away from the accommodating cavity 1401 and the side facing the accommodating cavity 1401. Heat exchange tubes 137 are provided on opposite sides of the first steel-aluminum composite plate 131. The large number of heat exchange tubes 137 provides a good heat exchange effect.

[0253] By adopting the technical solution of this embodiment, the installation position of the heat exchange tube 137 can be flexible to meet the usage requirements of different batteries 1100.

[0254] In other embodiments of the present application, referring to FIG21 , when the heat exchange tube 137 is located on the side of the first steel-aluminum composite plate 131 facing away from the accommodating cavity 1401 , the heat exchange tube 137 is bent to form a hollow area 1371 , and the first steel-aluminum composite plate 131 is provided with a convex portion 1315 , which is located in the hollow area 1371 .

[0255] The protrusion 1315 may be a protruding structure on the surface of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401 , for example, a protruding structure obtained by stamping the first steel-aluminum composite member.

[0256] The hollow area 1371 may refer to the gap area between the heat exchange tubes 137 after being bent.

[0257] By adopting the technical solution of this embodiment, the protrusion 1315 is inserted into the hollow area 1371 , and the protrusion 1315 can position the heat exchange tube 137 to facilitate the assembly of the first steel-aluminum composite plate 131 and the heat exchange tube 137 .

[0258] In some other embodiments of the present application, referring to FIG20 , when the heat exchange tube 137 is located on the side of the first steel-aluminum composite plate 131 facing the receiving cavity 1401 , the first steel-aluminum composite plate 131 is provided with a groove 1316 , and at least a portion of the heat exchange tube 137 is located in the groove 1316 .

[0259] The groove 1316 may be a groove structure formed by the surface of the first steel-aluminum composite plate 131 being recessed toward the receiving cavity 1401 , for example, a groove structure obtained by stamping the first steel-aluminum composite member.

[0260] By adopting the technical solution of this embodiment, the groove 1316 can accommodate the heat exchange tube 137, which can reduce the height of the heat exchange tube 137 extending into the receiving cavity 1401, thereby facilitating the installation of the battery 1100.

[0261] In other embodiments of the present application, referring to FIG. 13 , the steel frame 140 and the first steel plate layer 1311 are laser welded, resistance spot welded, or arc welded.

[0262] It is understandable that the steel frame 140 and the first steel plate layer 1311 can be welded by laser welding, resistance spot welding, or arc welding.

[0263] By adopting the technical solution of this embodiment, laser welding is adopted between the steel frame 140 and the first steel plate layer 1311. The laser welding has good welding quality and the welding reliability between the first steel plate layer 1311 and the steel frame 140 is good, which is beneficial to improving the reliability of the battery 1100. Resistance spot welding or arc welding is adopted between the steel frame 140 and the first steel plate layer 1311. The resistance spot welding has low welding cost, which is beneficial to reducing the production cost of the box body 100.

[0264] In other embodiments of the present application, referring to FIG. 10 , the steel frame 140 and the first steel plate layer 1311 are laser welded with filler wire.

[0265] Laser wire welding is a metal welding technology that uses a laser beam as a heat source. The high energy density laser beam heats the welding area to melt the filler material (wire) and combine it with the base metal.

[0266] Through the technical solution of this embodiment, filling material (wire) can be filled between the steel frame 140 and the first steel plate layer 1311, and the steel frame 140 and the first steel plate layer 1311 can be welded by melting the filling material with a laser beam. In this way, a filling material with a lower melting point can be selected to lower the welding temperature, reduce the impact on the first aluminum plate layer 1312, and improve the reliability of welding.

[0267] In some cases, due to the low melting point of the first aluminum plate layer 1312, if the temperature of welding the first steel plate layer 1311 to the steel frame 140 is high, the first aluminum plate layer 1312 may melt, resulting in welding defects, thereby affecting the connection reliability of the first steel-aluminum composite plate 131 and the steel frame 140.

[0268] In other embodiments of the present application, as shown in Figure 11, the first steel plate layer 1311 includes a covering area 13112 and an uncovered area 13111 connected to the covering area 13112, the first aluminum plate layer 1312 covers the covering area 13112, and the uncovered area 13111 is welded to the steel frame 140.

[0269] The covered area 13112 may refer to an area where the first steel plate layer 1311 is covered with the first aluminum plate layer 1312 , and the uncovered area 13111 may refer to an area where the first steel plate layer 1311 is not covered with the first aluminum plate layer 1312 .

[0270] The uncovered area 13111 is welded to the steel frame 140 , and the uncovered area 13111 can be welded to the steel frame 140 by resistance spot welding, arc welding, laser welding, or the like.

[0271] In some cases, the first aluminum plate layer 1312 can be peeled off in some areas on the first steel plate layer 1311 by mechanical means or chemical means. The area on the first steel plate layer 1311 where the first aluminum plate layer 1312 is peeled off is the uncovered area 13111, and the area on the first steel plate layer 1311 where the first aluminum plate layer 1312 is not removed is the covered area 13112.

[0272] By adopting the technical solution of this embodiment, an uncovered area is provided on the first steel-aluminum composite plate 131 , so that the first steel plate layer 1311 in the uncovered area is exposed, facilitating welding of the first steel-aluminum composite plate 131 and the steel frame 140 .

[0273] In addition, the first aluminum plate layer 1312 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 1312, which is beneficial to improving the reliability of welding; in addition, the first aluminum plate layer 1312 can be placed at a certain distance from the welding area, so that the first steel plate layer 1311 and the steel frame 140 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 1311 and the steel frame 140 to reduce welding costs. For example, the welding method between the first steel plate layer 1311 and the steel frame 140 can be resistance spot welding or arc welding to reduce welding costs.

[0274] In other embodiments of the present application, referring to Figure 11, the steel frame 140 includes a frame body 141 and a connecting portion 142 connected to each other. The frame body 141 is arranged to form a receiving cavity 1401. The connecting portion 142 is located on the side of the frame body 141 facing the receiving cavity 1401. The connecting portion 142 is welded to the first steel plate layer 1311.

[0275] The frame body 141 may refer to the main part of the steel frame 140. The frame body 141 is a frame structure with a hollow interior. The internal space of the frame body 141 forms a receiving cavity 1401. The connecting portion 142 may refer to the portion of the steel frame 140 that is connected to the frame body 141 and is located on the side of the frame body 141 facing the receiving cavity 1401. The connecting portion 142 extends toward the receiving cavity 1401. The connecting portion 142 and the frame body 141 may be an integrally molded structure. The connecting portion 142 and the frame body 141 may be two separately molded components. The connecting portion 142 and the frame body 141 may be connected by means of threads, clamping, bonding, etc.

[0276] As an example, each of the four frame strips is provided with a connecting portion 142 , and the four connecting portions 142 are connected end to end to form a first opening 1402 . The four sides of the first steel-aluminum composite plate 131 are welded to the four connecting portions 142 , thereby closing the first opening 1402 .

[0277] By adopting the technical solution of this embodiment, the connection portion 142 is located on the side of the frame 141 facing the receiving cavity 1401, allowing the welding equipment to be installed in the receiving cavity 1401, thereby reducing the difficulty of welding the connection portion 142 and the first aluminum plate layer 1312 and improving welding efficiency. In particular, when using resistance spot welding, the receiving cavity 1401 can provide installation space for the welding electrodes of the resistance spot welding, thereby facilitating the resistance spot welding of the connection portion 142 and the first steel plate layer 1311.

[0278] In other embodiments of the present application, as shown in FIG. 11 , the edge of the first steel-aluminum composite plate 131 is overlapped with the connecting portion 142 , and the edge of the first steel-aluminum composite plate 131 and the connecting portion 142 are welded.

[0279] The first steel-aluminum composite plate 131 and the connection portion 142 are stacked. The connection portion 142 can be located on the side of the first steel-aluminum composite plate 131 facing the receiving cavity 1401 or on the side of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401 .

[0280] By adopting the technical solution of this embodiment, the edge of the first steel-aluminum composite panel 131 is overlapped with the connecting portion 142 to form a multi-layer structure. The welding reliability between the first steel plate layer 1311 of the first steel-aluminum composite panel 131 and the connecting portion 142 is good, which is conducive to improving the sealing and structural reliability of the box body 100.

[0281] In other embodiments of the present application, referring to Figures 11 to 13, the end of the connecting portion 142 facing away from the frame 141 is welded to the edge of the first steel plate layer 1311; and / or, the middle portion of the connecting portion 142 is welded to the edge of the first steel plate layer 1311.

[0282] In a possible embodiment, referring to Figure 13, the end of the connecting portion 142 facing away from the frame 141 is welded to the first steel plate layer 1311, the first steel plate layer 1311 and the connecting portion 142 are abutted against each other, and the first steel plate layer 1311 is located on the side of the connecting portion 142 facing the accommodating cavity 1401, and the connecting portion 142 is located on the outside of the box body 100 to facilitate welding from the outside of the box body 100, and the welding operation is simple.

[0283] The end of the connecting portion 142 facing away from the frame 141 is welded to the first steel plate layer 1311, and the end of the connecting portion 142 facing away from the frame 141 is located on the outside of the box body 100, so as to facilitate welding from the outside of the box body 100, and the welding operation is simple; in addition, the end of the connecting portion 142 facing away from the frame body 141 forms a step structure with the first steel plate layer 1311, the welding quality is good, and the sealing performance after welding is good, which is beneficial to improving the reliability of the box body 100.

[0284] In another possible embodiment, the middle portion of the connection portion 142 is welded to the edge portion of the first steel plate layer 1311 , and the welding area between the middle portion of the connection portion 142 and the first steel plate layer 1311 is large, and the welding reliability is good.

[0285] In another possible embodiment, the end of the connection part 142 facing away from the frame 141 is welded to the edge of the first steel plate layer 1311; the middle part of the connection part 142 is welded to the edge of the first steel plate layer 1311, with multiple welding positions and good welding reliability.

[0286] By adopting the technical solution of this embodiment, the welding position of the connecting portion 142 and the first steel plate layer 1311 can be flexibly set to meet different usage requirements of the battery 1100.

[0287] In some other embodiments of the present application, referring to FIG. 13 , an edge of the first steel-aluminum composite plate 131 abuts against a surface of the connecting portion 142 facing the receiving cavity 1401 .

[0288] It is understandable that the first steel-aluminum composite plate 131 is located in the receiving cavity 1401 , and the edge of the first steel-aluminum composite plate 131 abuts against the connecting portion 142 .

[0289] By adopting the technical solution of this embodiment, the battery cell 200 is placed in the receiving cavity 1401, and the first steel-aluminum composite plate 131 supports the battery cell 200. The edge of the first steel-aluminum composite plate 131 abuts against the surface of the connecting portion 142 facing the receiving cavity 1401, so that the connecting portion 142 can support the first steel-aluminum composite plate 131 and reduce the stress on the weld structure 180 between the first steel plate layer 1311 and the connecting portion 142. The connection reliability between the first steel plate layer 1311 and the connecting portion 142 is good, the structural strength of the box body 100 is good, and it is beneficial to improve the reliability of the battery 1100.

[0290] In other embodiments of the present application, referring to FIG. 6 , an edge of the first steel-aluminum composite plate 131 abuts against an end surface of the steel frame 140 that is located on the same side as the first opening 1402 .

[0291] It can be understood that the first steel-aluminum composite panel 131 abuts against the end surface of the steel frame 140 and the first opening 1402 on the same side, the first steel-aluminum composite panel 131 can abut against the outer end surface of the steel frame 140, and the first steel-aluminum composite panel 131 can cover the first opening 1402 to achieve the closure of the first opening 1402.

[0292] By adopting the technical solution of this embodiment, the first steel plate layer 1311 can be welded to the steel frame 140 from the outside of the steel frame 140, and the welding operation is simple.

[0293] In some other embodiments of the present application, referring to FIG. 6 , the thickness H1 of the first steel plate layer 1311 is greater than the thickness H2 of the first aluminum plate layer 1312 .

[0294] The thickness H1 of the first steel plate layer 1311 may refer to the distance between two opposing surfaces along the thickness direction of the first steel plate layer 1311. When the first steel plate layer 1311 has convex or concave portions, the thickness of the first steel plate layer 1311 is measured based on a flat surface.

[0295] The thickness H2 of the first aluminum plate layer 1312 may refer to the distance between two opposing surfaces along the thickness direction of the first aluminum plate layer 1312. When the first aluminum plate layer 1312 has a convex portion or a concave portion, the thickness of the first aluminum plate layer 1312 is measured based on the flat surface.

[0296] By adopting the technical solution of this embodiment, the plate thickness H1 of the first steel plate layer 1311 is greater than the plate thickness H2 of the first aluminum plate layer 1312. The first steel plate layer 1311 is thicker, and the structural strength of the first steel-aluminum composite panel 131 is good, which is beneficial to improving the structural strength of the box 100 and also facilitates the integration of other components on the first steel-aluminum composite panel 131, thereby improving the integration of the electrical device or battery 1100.

[0297] In other embodiments of the present application, referring to FIG. 6 , the thickness of the first steel plate layer 1311 ranges from 0.3 mm to 3 mm.

[0298] It can be understood that 0.3mm≤H1≤3mm, where H1≥0.3mm, so that the first steel plate layer 1311 has a certain thickness, and the first steel plate layer 1311 has a certain structural strength, and can be stably welded to the steel frame 140; H1≤3mm, so that the thickness of the first steel plate layer 1311 is not too large, which will cause material waste, which is beneficial to reducing the production cost of the box 100.

[0299] By adopting the technical solution of this embodiment, the thickness of the first steel plate layer 1311 ranges from 0.3 mm to 3 mm, so that the first steel-aluminum composite plate 131 can better balance the structural strength and production cost of the first steel-aluminum composite plate 131.

[0300] In other embodiments of the present application, referring to FIG. 6 , the thickness of the first steel plate layer 1311 ranges from 0.5 mm to 2 mm.

[0301] It can be understood that 0.5mm≤H1≤2mm, where H1≥0.5mm, so that the first steel plate layer 1311 has a suitable thickness, so that the first steel-aluminum composite plate 131 has good structural strength, and the first steel-aluminum composite plate 131 can be better welded to the steel frame 140; H1≤2mm, so that the first steel plate layer 1311 can better save materials and reduce production costs.

[0302] By adopting the technical solution of this embodiment, the thickness of the first steel plate layer 1311 ranges from 0.5 mm to 2 mm, so that the first steel-aluminum composite plate 131 can better balance the structural strength and production cost of the first steel-aluminum composite plate 131 .

[0303] In some embodiments, the value of the plate thickness H1 of the first steel plate layer 1311 can be, but is not limited to, 0.3 mm, 3 mm, or any number between 0.3 mm and 3 mm; for example: 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm.

[0304] In other embodiments of the present application, referring to FIG. 6 , the thickness of the first aluminum plate layer 1312 ranges from 0.02 mm to 1 mm.

[0305] It can be understood that 0.02mm≤H2≤1mm, where H2≥0.02mm, ensures that the first aluminum plate layer 1312 has a certain thickness to reduce the weight of the plate assembly 130; H2≤1mm ensures that the thickness of the first aluminum plate layer 1312 is not too large, thereby causing material waste, which is beneficial to reducing the production cost of the box 100.

[0306] By adopting the technical solution of this embodiment, the thickness of the first aluminum plate layer 1312 ranges from 0.02 mm to 1 mm, so that the first steel-aluminum composite plate 131 can better balance the weight and production cost of the first steel-aluminum composite plate 131 .

[0307] In other embodiments of the present application, referring to FIG. 6 , the thickness of the first aluminum plate layer 1312 ranges from 0.05 mm to 0.3 mm.

[0308] It can be understood that 0.05mm≤H2≤0.3mm, where H2≥0.3mm, so that the first aluminum plate layer 1312 has a suitable thickness to better reduce the weight of the first steel-aluminum composite panel 131; H2≤2mm, so that the first aluminum plate layer 1312 can better save materials and reduce production costs.

[0309] By adopting the technical solution of this embodiment, the thickness of the first aluminum plate layer 1312 ranges from 0.05 mm to 0.3 mm, so that the first steel-aluminum composite plate 131 can better balance the weight and production cost of the first steel-aluminum composite plate 131 .

[0310] In some embodiments, the value of the plate thickness H2 of the first aluminum plate layer 1312 can be, but is not limited to, 0.02 mm, 1 mm, or any number between 0.02 mm and 1 mm; for example: 0.02 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm.

[0311] Please refer to Figures 22 to 25. Figure 22 is a schematic structural diagram of the housing 100 provided in other embodiments of the present application. Figure 23 is a cross-sectional view along line KK in Figure 22. Figure 24 is a partial enlarged view of point M in Figure 23. Figure 25 is a partial enlarged view of point E in Figure 24 of the housing 100 provided in other embodiments of the present application.

[0312] In other embodiments of the present application, referring to Figures 22 to 24, the edge of the first steel-aluminum composite plate 131 is bent toward the first aluminum plate layer 1312, so that the first steel-aluminum composite plate 131 forms a main body 1313 and a flange portion 1314; the first steel plate layer 1311 of the flange portion 1314 is welded to the steel frame 140; and / or, the first steel plate layer 1311 of the main body 1313 is welded to the steel frame 140.

[0313] The main body 1313 may refer to the main body 1313 of the first steel-aluminum composite panel 131 ; the flange 1314 may refer to a portion of the edge of the first steel-aluminum composite panel 131 that is bent and flipped relative to the main body 1313 .

[0314] The edge of the first steel-aluminum composite panel 131 is bent toward the first aluminum plate layer 1312 , so that the first steel plate layer 1311 of the first steel-aluminum composite panel 131 is located on the outside, so that the steel frame 140 and the first aluminum plate layer 1312 can be separated by the first steel plate layer 1311 .

[0315] In one possible embodiment, the edge of the first steel-aluminum composite plate 131 is bent toward the first aluminum plate layer 1312 so that the first steel-aluminum composite plate 131 forms a main body 1313 and a flange portion 1314; the first steel plate layer 1311 of the flange portion 1314 is welded to the steel frame 140.

[0316] In one example, when the first aluminum plate layer 1312 is located on the side of the first steel-aluminum composite panel 131 close to the receiving cavity 1401, the flange portion 1314 can be inserted into the receiving cavity 1401, so that the first steel plate layer 1311 of the flange portion 1314 can be arranged opposite to the surface of the steel frame 140 facing the receiving cavity 1401, so as to facilitate welding of the first steel plate layer 1311 of the flange portion 1314 to the steel frame 140.

[0317] In another example, when the first steel plate layer 1311 is located on the side of the first steel-aluminum composite panel 131 close to the receiving cavity 1401, the first steel plate layer 1311 of the flange portion 1314 is adjacent to the steel frame 140, thereby achieving welding between the first steel plate layer 1311 of the flange portion 1314 and the steel frame 140. The flange portion 1314 may or may not be inserted into the receiving cavity 1401.

[0318] In another possible embodiment, the edge of the first steel-aluminum composite panel 131 is bent toward the first aluminum plate layer 1312 so that the first steel-aluminum composite panel 131 forms a main body 1313 and a flange portion 1314; the first steel plate layer 1311 of the main body 1313 is welded to the steel frame 140.

[0319] In one example, when the first aluminum plate layer 1312 is located on the side of the first steel-aluminum composite plate 131 close to the receiving cavity 1401, the flange portion 1314 is completely inserted into the receiving cavity 1401, and the edge of the first steel plate layer 1311 of the main body 1313 close to the flange portion 1314 can be welded to the steel frame 140.

[0320] In another example, when the first steel plate layer 1311 is located on the side of the first steel-aluminum composite panel 131 close to the receiving cavity 1401 , the main body 1313 is located in the receiving cavity 1401 , and the main body 1313 directly abuts against the steel frame 140 and is welded to the steel frame 140 .

[0321] In another possible embodiment, the edge of the first steel-aluminum composite plate 131 is bent toward the first aluminum plate layer 1312 so that the first steel-aluminum composite plate 131 forms a main body 1313 and a flange portion 1314; the first steel plate layer 1311 of the flange portion 1314 is welded to the steel frame 140, and the first steel plate layer 1311 of the main body 1313 is welded to the steel frame 140.

[0322] In one example, when the first aluminum plate layer 1312 is located on the side of the first steel-aluminum composite panel 131 close to the receiving cavity 1401, the flange portion 1314 is completely inserted into the receiving cavity 1401, and the edge of the first steel plate layer 1311 of the body 1313 close to the flange portion 1314 can be welded to the steel frame 140, and the first steel plate layer 1311 of the flange portion 1314 is welded to the steel frame 140.

[0323] In another example, when the first steel plate layer 1311 is located on the side of the first steel-aluminum composite panel 131 close to the receiving cavity 1401, the main body 1313 is located inside the receiving cavity 1401, or the main body 1313 is located outside the receiving cavity 1401; when the main body 1313 is located outside the receiving cavity 1401, the main body 1313 directly abuts against the steel frame 140, the first steel plate layer 1311 of the main body 1313 is welded to the steel frame 140, and the first steel plate layer 1311 of the flange portion 1314 is welded to the steel frame 140.

[0324] By adopting the technical solution of this embodiment, after the edge of the first steel-aluminum composite panel 131 is bent toward the first aluminum plate layer 1312, the first steel plate layer 1311 is covered on the outside of the first aluminum plate layer 1312. The first steel plate layer 1311 can separate the steel frame 140 and the first aluminum plate layer 1312, thereby protecting the first aluminum plate layer 1312 and reducing the impact of the high temperature of welding the first steel plate layer 1311 to the steel frame 140 on the first aluminum plate layer 1312. This is conducive to reducing welding defects, improving welding quality, and improving the connection reliability of the first steel-aluminum composite panel 131 and the steel frame 140.

[0325] In some other embodiments of the present application, referring to FIG. 24 , the angle between the flange portion 1314 and the main body portion 1313 is α, wherein 90°≤α<180°.

[0326] It can be understood that the bending angle β of the flange portion 1314 relative to the main portion 1313 is less than or equal to 90°, and the angle α between the flange portion 1314 and the main portion 1313 and the bending angle β of the flange portion 1314 relative to the main portion 1313 are complementary angles.

[0327] By adopting the technical solution of this embodiment, the bending angle of the flange portion 1314 relative to the main body portion 1313 is small, and the bending difficulty of the first steel-aluminum composite plate 131 is small, which is conducive to improving the manufacturing efficiency of the box body 100.

[0328] In other embodiments of the present application, referring to FIG. 24 , 90°≤α≤110°.

[0329] By adopting the technical solution of this embodiment, the design of 90°≤α≤110° makes the flange portion 1314 and the main body portion 1313 vertical or nearly vertical, and the structure of the first steel-aluminum composite plate 131 is regular, which facilitates the connection between the first steel plate layer 1311 and the steel frame 140.

[0330] 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°.

[0331] In other embodiments of the present application, referring to FIG. 24 , at least a portion of the flange portion 1314 is inserted into the receiving cavity 1401 .

[0332] It is understandable that a portion of the flange portion 1314 is inserted into the receiving cavity 1401 , and another portion of the flange portion 1314 is located outside the receiving cavity 1401 , or the entire flange portion 1314 is located inside the receiving cavity 1401 .

[0333] By adopting the technical solution of this embodiment, the flange portion 1314 is located in the receiving cavity 1401, which can reduce the size of the box body 100 and help improve the volume energy density of the battery 1100; in addition, the flange portion 1314 is located in the receiving cavity 1401, which also facilitates the welding of the first steel plate layer 1311 of the flange portion 1314 and the steel frame 140.

[0334] In some other embodiments of the present application, referring to FIG. 24 , the first steel plate layer 1311 of the flange portion 1314 abuts against the surface of the steel frame 140 facing the receiving cavity 1401 .

[0335] It can be understood that the first steel plate layer 1311 of the flange portion 1314 is inserted into the receiving cavity 1401 , and the first steel plate layer 1311 abuts against the side wall surface of the receiving cavity 1401 .

[0336] By adopting the technical solution of this embodiment, the first steel plate layer 1311 of the flange portion 1314 abuts against the surface of the steel frame 140 facing the receiving cavity 1401 , which is beneficial to improving the welding quality and welding reliability after welding and improving the structural reliability of the box body 100 .

[0337] In some other embodiments of the present application, referring to FIG. 25 , the angle between the flange portion 1314 and the main body portion 1313 is α, where 0°≤α<90°.

[0338] It can be understood that the bending angle β of the flange portion 1314 relative to the main body portion 1313 is greater than 90°, so that the first steel plate layer 1311 can form a double-layer structure after bending, and the first aluminum plate layer 1312 is located in the double-layer structure, and the first steel plate layer 1311 can better cover the first aluminum plate layer 1312.

[0339] By adopting the technical solution of this embodiment, the first steel plate layer 1311 can better cover the first aluminum plate layer 1312, and the first steel plate layer 1311 can better protect the first aluminum plate layer 1312, reducing the impact of the high temperature of welding the first steel plate layer 1311 and the steel frame 140 on the first aluminum plate layer 1312, which is conducive to improving the welding quality.

[0340] In other embodiments of the present application, referring to FIG. 25 , 0°≤α≤10°.

[0341] By adopting the technical solution of this embodiment, the design of 0°≤α≤10° makes the flange portion 1314 parallel or nearly parallel to the main body portion 1313, and the first aluminum plate layer 1312 is located within the double-layer structure formed by the bending of the first steel plate layer 1311. In this way, even if the first steel plate layer 1311 is affected by the high temperature of welding, the first aluminum plate layer 1312 is still located between the two layers of the first steel plate layer 1311 after melting, thereby reducing welding defects and improving the connection reliability between the first steel-aluminum composite panel 131 and the steel frame 140. In addition, the double-layer structure formed by the bending of the first steel plate layer 1311 is welded to the steel roll-pressed frame, so that the first steel-aluminum composite panel 131 does not need to use a complex process to peel off the first aluminum plate layer 1312 in the welding area, simplifying the manufacturing process, which is conducive to improving manufacturing efficiency and reducing manufacturing costs. At the same time, the double-layer structure formed by the bending of the first steel plate layer 1311 has good structural strength, which is conducive to improving the connection strength between the first steel plate layer 1311 and the steel frame 140, and improving the overall strength and reliability of the box 100.

[0342] In this case, the first steel plate layer 1311 and the steel frame 140 can be welded by resistance spot welding or arc welding with a higher welding temperature. 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.

[0343] As an example, as shown in FIG. 25 , when the value of α is 0°, the flange portion 1314 is bent 180° relative to the main body portion 1313 , and the flange portion 1314 covers the edge of the main body portion 1313 .

[0344] 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°.

[0345] In other embodiments of the present application, referring to Figures 24 and 25, the flange portion 1314 includes a bending section 13141 and a flange section 13142, the bending section 13141 is connected between the flange section 13142 and the main body 1313; the first steel plate layer 1311 of the bending section 13141 is welded to the steel frame 140.

[0346] The bending section 13141 may refer to the bent portion in the flange portion 1314 , that is, the bent portion in the first steel-aluminum composite plate 131 , the portion where the flange portion 1314 is bent relative to the main body portion 1313 , and the bending section 13141 is connected between the flange section 13142 and the main body portion 1313 .

[0347] As an example, as shown in Figures 24 and 25 , the first steel-aluminum composite panel 131 is divided into a main body 1313 and a bent section 13141 at the point where the flange 1314 begins to bend relative to the main body 1313. The point where the flange 1314 begins to bend relative to the main body 1313 can be seen in dashed line a in Figures 24 and 25 , i.e., the main body 1313 and the bent section 13141 are separated by dashed line a. The first steel-aluminum composite panel 131 is divided into a bent section 13141 and a flange section 13142 at the point where the flange 1314 ends to bend relative to the main body 1313. The point where the flange 1314 ends to bend relative to the main body 1313 can be seen in dashed line b in Figures 24 and 25 , i.e., the bent section 13141 and the flange section 13142 are separated by dashed line b. The bent section 13141 can have various shapes, such as a circular arc, an elliptical arc, etc.

[0348] As shown in FIG. 24 , the shape of the bending section 13141 is a quarter arc, so that the value of α is 90°.

[0349] As shown in FIG. 25 , the shape of the bending section 13141 is a half-circle arc, so that the value of α is 0°.

[0350] By adopting the technical solution of this embodiment, the welding operation between the bending section 13141 and the steel frame 140 is easy. In addition, the bending section 13141 also has a large welding area, which is beneficial to improving the welding reliability of the first steel plate layer 1311 and the steel frame 140.

[0351] Please refer to Figures 26 to 31. Figure 26 is a cross-sectional view along line BB in Figure 4. Figure 27 is a partial enlarged view of point N in Figure 26. Figure 28 is a partial enlarged view of point N in Figure 26 of the box body 100 provided in some other embodiments of the present application. Figure 29 is a partial enlarged view of point N in Figure 26 of the box body 100 provided in some other embodiments of the present application. Figure 30 is a structural schematic diagram of the stamping basin 150 of the box body 100 provided in some other embodiments of the present application. Figure 31 is a cross-sectional view along line OO in Figure 30.

[0352] In other embodiments of the present application, referring to FIG. 26 and FIG. 27 , the box body 100 further includes a connecting beam 160 located in the receiving cavity 1401 , and the connecting beam 160 is connected to the first steel-aluminum composite panel 131 via a fastener 190 .

[0353] The connecting beam 160 may refer to a beam structure disposed within the receiving cavity 1401. The connecting beam 160 may be an expansion beam used to limit the expansion of the battery cells 200 within the receiving cavity 1401, or a reinforcement beam disposed within the receiving cavity 1401 to increase the structural strength of the housing 100. Of course, the connecting beam 160 may also refer to a beam structure serving other functions within the receiving cavity 1401. The connecting beam 160 may be a die-cast structure, a profile structure, or the like.

[0354] The connecting beam 160 is connected to the first steel-aluminum composite panel 131 via fasteners 190. As will be understood, the connecting beam 160 has a first connection hole, and the first steel-aluminum composite panel 131 has a second connection hole. Fasteners 190 are inserted through the first and second connection holes, thereby securing the first steel-aluminum composite panel 131 to the connecting beam 160. Fasteners 190 can be bolts, rivets, screws, etc. There can be one or more fasteners 190, and multiple fasteners 190 can be spaced apart along the length of the connecting beam 160 to enhance the reliability of the connection between the connecting beam 160 and the first steel-aluminum composite panel 131. Sealant is applied to the fasteners 190 to seal the second connection hole, thereby enhancing the sealing performance of the housing 100.

[0355] As an example, the fastener 190 is a double-layer rivet nut, and a sealant is provided between the flange of the double-layer rivet nut and the first steel-aluminum composite plate 131 , and the sealant can improve the sealing performance of the connection.

[0356] By adopting the technical solution of this embodiment, the connecting beam 160 and the first steel-aluminum composite plate 131 are connected by the fastener 190 , and the connection reliability between the connecting beam 160 and the first steel-aluminum composite plate 131 is good.

[0357] In other embodiments of the present application, as shown in FIG. 28 , the connecting beam 160 is located on the side of the first steel plate layer 1311 facing away from the first aluminum plate layer 1312 , and the connecting beam 160 is welded to the first steel plate layer 1311 .

[0358] The connecting beam 160 is located on the side of the first steel plate layer 1311 facing away from the first aluminum plate layer 1312, that is, the first steel plate layer 1311 is located between the connecting beam 160 and the first aluminum plate layer 1312. The first steel plate layer 1311 is adjacent to the connecting beam 160, which facilitates the welding of the first steel plate layer 1311 to the connecting beam 160.

[0359] When the plate member 132 includes an aluminum plate 1321 , the aluminum plate 1321 is located on a side of the first steel-aluminum composite plate 131 facing away from the connection beam 160 , so that the first steel plate layer 1311 is adjacent to the connection beam 160 .

[0360] In the case where the panel 132 includes the second steel-aluminum composite panel 1322 , the first steel-aluminum composite panel 131 is located between the second steel-aluminum composite panel 1322 and the connecting beam 160 such that the first steel plate layer 1311 is adjacent to the connecting beam 160 .

[0361] By adopting the technical solution of this embodiment, the connecting beam 160 is welded to the first steel plate layer 1311, which can reduce the use of fasteners 190 and the number of parts of the box body 100, which is beneficial to improving the assembly efficiency of the box body 100, and can also simplify the structure of the box body 100, which is beneficial to reducing the production cost of the box body 100.

[0362] In some other embodiments of the present application, referring to Figure 29, the plate assembly 130 also includes a second steel-aluminum composite plate 1322 stacked with the first steel-aluminum composite plate 131, the second steel-aluminum composite plate 1322 is located between the connecting beam 160 and the first steel-aluminum composite plate 131, the second steel-aluminum composite plate 1322 includes a second steel plate layer 13221 and a second aluminum plate layer 13222 stacked, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221, and the second steel plate layer 13221 is welded to the connecting beam 160.

[0363] It can be understood that the second steel-aluminum composite plate 1322 is located between the first steel-aluminum composite plate 131 and the connecting beam 160, and the second aluminum plate layer 13222 of the second steel-aluminum composite plate 1322 is located between the second steel plate layer 13221 and the first steel-aluminum composite plate 131, that is, the second steel plate layer 13221 can be adjacent to the connecting beam 160, so that the second steel plate layer 13221 and the connecting beam 160 can be welded.

[0364] By adopting the technical solution of this embodiment, the plate assembly 130 includes a first steel-aluminum composite plate 131 and a second steel-aluminum composite plate 1322 stacked in a structure, and the structural reliability of the box 100 is good. In addition, the connection beam 160 is welded to the second steel plate layer 13221, which can reduce the use of fasteners 190 and the number of parts of the box 100, which is beneficial to improving the assembly efficiency of the box 100, and can also simplify the structure of the box 100, which is beneficial to reducing the production cost of the box 100.

[0365] In other embodiments of the present application, referring to Figures 30 and 31, the box body 100 also includes a connecting beam 160 located in the accommodating cavity 1401, and a heat exchange area 135 for placing the battery cell 200 is formed on the surface of the plate assembly 130 facing the connecting beam 160, and the projection of the connecting beam 160 on the plane where the heat exchange area 135 is located is staggered with the heat exchange area 135.

[0366] The heat exchange area 135 may refer to a portion of the surface of the plate assembly 130 facing the connecting beam 160. This area is where the battery cells 200 are mounted, allowing them to exchange heat with the plate assembly 130. For example, the projected area of ​​the battery cells 200 in the battery 1100 onto the plane where the heat exchange area 135 is located is the heat exchange area 135. Heat exchange channels 133 may be provided in the portion of the plate assembly 130 corresponding to the heat exchange area 135 to facilitate heat exchange between the battery cells 200.

[0367] The projection of the connecting beam 160 on the plane where the heat exchange zone 135 is located is staggered with the heat exchange zone 135. It can be understood that the connecting beam 160 is located on the side of the heat exchange zone 135, and the projection of the connecting beam 160 on the plane where the heat exchange zone 135 is located does not overlap with the heat exchange zone 135.

[0368] By adopting the technical solution of this embodiment, the projection of the connecting beam 160 on the plane where the heat exchange zone 135 is located is staggered with the heat exchange zone 135, so that the connecting beam 160 will not occupy the space corresponding to the heat exchange zone 135 for installing the battery cell 200, so that the box 100 can accommodate more battery cells 200 for installation, thereby increasing the number of battery cells 200 in the battery 1100 and improving the energy density of the battery 1100.

[0369] As an example, the connecting beam 160 can be connected to the connecting portion 142, and the connecting beam 160 can be spliced ​​together by multiple bent plates 161. At least one of the ends facing the plate assembly 130 and the ends facing away from the plate assembly 130 of the bent plates 161 adjacent to the heat exchange zone 135 is bent away from the heat exchange zone 135, so that the connecting beam 160 does not occupy the space corresponding to the heat exchange zone 135 for the installation of the battery cell 200, so that the box 100 can accommodate more battery cells 200 for installation, thereby increasing the number of battery cells 200 in the battery 1100 and improving the energy density of the battery 1100.

[0370] Of course, in other examples, the connecting beam 160 may also be connected to the first steel-aluminum composite panel 131 .

[0371] In some stamped enclosure designs, the heat exchanger is mounted on the underside of a stamped basin 150 at the bottom of the enclosure 100. Heat exchange between the heat exchanger and the battery cells 200 must pass through the bottom of the stamped basin 150, resulting in poor heat transfer within the battery cells 200. Furthermore, a bottom support plate is required to protect the heat exchanger, complicating the enclosure 100's structure.

[0372] In some embodiments, referring to Figures 30 and 31, the stamping basin 150 is a hollow structure with an opening on one side. The peripheral wall of the stamping basin 150 forms at least a portion of the frame 141. A portion of the material is removed from the bottom of the stamping basin 150 to form a first opening 1402, and the portion of the bottom of the stamping basin 150 that is not removed forms a connecting portion 142. The plate assembly 130 includes a first steel-aluminum composite plate 131 and a plate 132. The plate 132 and the first steel-aluminum composite plate 131 are stacked and enclosed to form a heat exchange channel 133 for the flow of a heat exchange medium. The first steel-aluminum composite plate 131 and The plate 132 covers the first opening 1402, so that the battery cell 200 is placed in the stamping basin 150, and the battery cell 200 directly exchanges heat with the plate assembly 130 without passing through the stamping basin 150, which is beneficial to improving the heat exchange effect; the first steel plate layer 1311 of the first steel-aluminum composite plate 131 is located on the side of the first aluminum plate layer 1312 facing away from the accommodating cavity 1401. Since the first steel plate layer 1311 has good structural strength and can play a good protective role, the tray can be removed, thereby simplifying the structure of the box body 100 and reducing the production cost of the box body 100.

[0373] In other embodiments of the present application, referring to FIG. 3 and FIG. 9 , the top plate of the box body 100 and / or the bottom plate of the box body 100 include a plate assembly 130 .

[0374] During use of the battery 1100 , the box body 100 has upper and lower positions. The top plate of the box body 100 may refer to the plate located on the upper side of the box body 100 , and the bottom plate of the box body 100 may refer to the plate located on the lower side of the box body 100 .

[0375] In one possible embodiment, as shown in FIG3 , the top plate of the housing 100 includes a plate assembly 130. It will be appreciated that the plate assembly 130 is located on the upper side of the housing 100 and is capable of sealing the upper opening of the housing 100. Specifically, when heat exchange channels 133 are formed within the plate assembly 130, heat exchange can be achieved from the top of the battery cells 200.

[0376] In another possible embodiment, as shown in Figures 9 to 11 , the bottom plate of the housing 100 includes a plate assembly 130. It will be appreciated that the plate assembly 130 is located on the bottom side of the housing 100 and is capable of sealing the bottom opening of the housing 100. Specifically, when heat exchange channels 133 are formed within the plate assembly 130, bottom heat exchange can be achieved for the battery cells 200.

[0377] In another possible embodiment, both the top plate and the bottom plate of the housing 100 include a plate assembly 130. It is understood that there are two plate assemblies 130, one of which is located on the upper side of the housing 100 and is capable of closing the upper opening of the housing 100, and the other of which is located on the lower side of the housing 100 and is capable of closing the lower opening of the housing 100. The structures of the two plate assemblies 130 may be the same or different. In particular, when heat exchange channels 133 are formed in both plate assemblies 130, heat exchange between the bottom and top of the battery cells 200 can be achieved.

[0378] By adopting the technical solution of this embodiment, the plate assembly 130 is used as the top plate and / or bottom plate of the box body 100, which can increase the structural strength of the box body 100 and is also conducive to integrating the first steel-aluminum composite plate 131 with other components to reduce the use of bolts and improve the assembly efficiency of the box body 100.

[0379] The present application is described below with reference to some embodiments.

[0380] Example 1

[0381] In this embodiment, referring to Figures 3 to 7, the box body 100 includes a steel frame 140 and a panel assembly 130. The steel frame 140 encloses a receiving cavity 1401 and a first opening 1402 communicating with the receiving cavity 1401. The panel assembly 130 covers the first opening 1402 and includes a first steel-aluminum composite panel 131. The first steel-aluminum composite panel 131 includes a first steel plate layer 1311 and a first aluminum plate layer 1312 stacked together. The first steel plate layer 1311 is welded to the steel frame 140.

[0382] Example 2

[0383] This embodiment differs from the first embodiment in that, as shown in Figures 3 to 7, the plate assembly 130 further includes a plate 132, which is stacked with the first steel-aluminum composite plate 131. The plate 132 and the first steel-aluminum composite plate 131 enclose a heat exchange channel 133 for the flow of heat exchange medium.

[0384] In this embodiment, the plate 132 is located on the side of the first steel-aluminum composite plate 131 facing the receiving cavity 1401 . The plate 132 is a flat plate. The first steel-aluminum composite plate 131 is recessed away from the aluminum plate 1321 to form the heat exchange channel 133 .

[0385] In this embodiment, the edge of the first steel-aluminum composite plate 131 abuts against the end surface of the steel frame 140 that is located on the same side as the first opening 1402 .

[0386] In this embodiment, the periphery of the first steel plate layer 1311 is laser welded to the steel frame 140 .

[0387] In this embodiment, the periphery of the first steel plate layer 1311 is laser welded to the steel frame 140 by means of filler wire.

[0388] In this embodiment, the first opening 1402 is located on the upper side of the box body 100 , and the plate assembly 130 serves as the top plate of the box body 100 .

[0389] In this embodiment, the plate 132 is an aluminum plate 1321 , and the aluminum plate 1321 is brazed to the first aluminum plate layer 1312 .

[0390] Example 3

[0391] The difference between this embodiment and the second embodiment is that: as shown in Figures 9 to 11, the first steel plate layer 1311 includes a covering area 13112 and an uncovered area 13111 connected to the covering area 13112, the first aluminum plate layer 1312 covers the covering area 13112, and the uncovered area 13111 is welded to the steel frame 140.

[0392] In this embodiment, the steel frame 140 includes a frame body 141 and a connecting portion 142 connected to each other. The frame body 141 surrounds a receiving cavity 1401 . The connecting portion 142 is located on the side of the frame body 141 facing the receiving cavity 1401 . The connecting portion 142 is welded to the first steel plate layer 1311 .

[0393] In this embodiment, the uncovered area 13111 abuts against the surface of the connecting portion 142 facing the receiving cavity 1401 .

[0394] In this embodiment, the uncovered area 13111 and the middle portion of the connecting portion 142 are resistance spot welded or arc welded.

[0395] Example 4

[0396] The difference between this embodiment and the third embodiment is that: as shown in Figure 12, the plate 132 is a first steel-aluminum composite plate 131, the first steel-aluminum composite plate 131 is stacked with the first steel-aluminum composite plate 131, the second steel-aluminum composite plate 1322 includes a second steel plate layer 13221 and a second aluminum plate layer 13222 stacked, and the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221.

[0397] In this embodiment, the edge of the first steel-aluminum composite panel 131 and the edge of the second steel-aluminum composite panel 1322 overlap to form an overlapping area 136 , and the overlapping area 136 is welded to the steel frame 140 .

[0398] In this embodiment, the overlapping area 136 and the middle portion of the connecting portion 142 are resistance spot welded or arc welded.

[0399] In this embodiment, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are brazed.

[0400] Example 5

[0401] The difference between this embodiment and the second embodiment is that: as shown in FIG. 13 , the aluminum plate 1321 completely covers the first steel-aluminum composite plate 131 , and the first aluminum plate layer 1312 is located between the aluminum plate 1321 and the first steel plate layer 1311 .

[0402] In this embodiment, the end of the connecting portion 142 facing away from the frame 141 is welded to the first steel plate layer 1311 .

[0403] In this embodiment, the end of the connecting portion 142 facing away from the frame 141 is laser welded to the first steel plate layer 1311 by means of filler wire.

[0404] Example 6

[0405] The difference between this embodiment and the second embodiment is shown in Figures 14 to 16. The edge of the first steel-aluminum composite plate 131 protrudes from the plate member 132 to form a protruding portion 134. The first steel plate layer 1311 of the protruding portion 134 is welded to the steel frame 140.

[0406] Example 7

[0407] The difference between this embodiment and the first embodiment is that, as shown in Figures 17 to 20 , the housing 100 further includes a heat exchange tube 137 for allowing the heat exchange medium to flow, and the heat exchange tube 137 is connected to the first steel-aluminum composite plate 131 .

[0408] In this embodiment, the heat exchange tube 137 is an aluminum tube, the first aluminum plate layer 1312 is located between the aluminum tube and the first steel plate layer 1311 , and the aluminum tube and the first aluminum plate layer 1312 are welded.

[0409] In this embodiment, the aluminum tube is brazed to the first aluminum plate layer 1312 .

[0410] In this embodiment, a heat exchange tube 137 is provided on the side of the first steel-aluminum composite plate 131 facing the receiving cavity 1401 .

[0411] In this embodiment, the first steel-aluminum composite plate 131 is provided with a groove 1316 , and at least a portion of the heat exchange tube 137 is located in the groove 1316 .

[0412] Example 8

[0413] The difference between this embodiment and the seventh embodiment is that, as shown in FIG. 21 , a heat exchange tube 137 is provided on the side of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401 .

[0414] In this embodiment, when the heat exchange tube 137 is located on the side of the first steel-aluminum composite plate 131 facing away from the receiving cavity 1401, the heat exchange tube 137 is bent to form a hollow area 1371, and the first steel-aluminum composite plate 131 is provided with a convex portion 1315, which is located in the hollow area 1371.

[0415] Example 9

[0416] The difference between this embodiment and the first embodiment is that, as shown in Figures 22 to 24, the edge of the first steel-aluminum composite plate 131 is bent toward the first aluminum plate layer 1312, so that the first steel-aluminum composite plate 131 forms a main body 1313 and a flange portion 1314; the first steel plate layer 1311 of the flange portion 1314 is welded to the steel frame 140; and / or, the first steel plate layer 1311 of the main body 1313 is welded to the steel frame 140.

[0417] In this embodiment, the included angle between the flange portion 1314 and the main body portion 1313 is α, wherein 90°≤α<180°.

[0418] In this embodiment, 90°≤α≤110°.

[0419] In this embodiment, α=90°.

[0420] In this embodiment, at least a portion of the flange portion 1314 is inserted into the receiving cavity 1401 .

[0421] In this embodiment, the first steel plate layer 1311 of the flange portion 1314 abuts against the surface of the steel frame 140 facing the receiving cavity 1401 .

[0422] In this embodiment, the flange portion 1314 includes a bending section 13141 and a flange section 13142 , and the bending section 13141 is connected between the flange section 13142 and the main body 1313 ; the first steel plate layer 1311 of the bending section 13141 is welded to the steel frame 140 .

[0423] In this embodiment, the first aluminum plate layer 1312 is located on the side of the first steel plate layer 1311 facing the receiving cavity 1401 , and the flange portion 1314 is completely inserted into the receiving cavity 1401 .

[0424] In this embodiment, the first opening 1402 is located at the lower side of the box body 100 , and the plate assembly 130 serves as the bottom plate of the box body 100 .

[0425] Example 10

[0426] The difference between this embodiment and the ninth embodiment is that, as shown in FIG. 10 , the angle between the flange portion 1314 and the main body portion 1313 is α, where 0°≤α<90°.

[0427] In this embodiment, 0°≤α≤10°.

[0428] In this embodiment, α=0°.

[0429] In this embodiment, the flange section 13142 abuts against the end surface of the steel frame 140 that is located on the same side as the first opening 1402 .

[0430] In this embodiment, the plate 132 is an aluminum plate 1321 .

[0431] Example 11

[0432] The difference between this embodiment and the second embodiment is that, referring to Figures 4, 26 and 27, the box body 100 further includes a connecting beam 160 located in the receiving cavity 1401, and the connecting beam 160 is connected to the first steel-aluminum composite panel 131 via a fastener 190.

[0433] Example 12

[0434] The difference between this embodiment and the eleventh embodiment is that: as shown in Figure 28, the box body 100 also includes a connecting beam 160 located in the receiving cavity 1401, the first steel plate layer 1311 is located between the connecting beam 160 and the first aluminum plate layer 1312, and the connecting beam 160 is welded to the first steel plate layer 1311.

[0435] Example 13

[0436] The difference between this embodiment and the twelfth embodiment is that: as shown in Figure 29, the plate 132 is a second steel-aluminum composite plate 1322, the second steel-aluminum composite plate 1322 is stacked with the first steel-aluminum composite plate 131, the second steel-aluminum composite plate 1322 is located between the connecting beam 160 and the first steel-aluminum composite plate 131, the second steel-aluminum composite plate 1322 includes a second steel plate layer 13221 and a second aluminum plate layer 13222 stacked, the first aluminum plate layer 1312 and the second aluminum plate layer 13222 are located between the first steel plate layer 1311 and the second steel plate layer 13221, and the second steel plate layer 13221 is welded to the connecting beam 160.

[0437] Example 14

[0438] The difference between this embodiment and the third embodiment is that: referring to Figures 30 and 31, the box body 100 also includes a connecting beam 160 located in the accommodating cavity 1401, and a heat exchange area 135 is formed on the surface of the plate assembly 130 facing the connecting beam 160, and the projection of the connecting beam 160 on the plane where the heat exchange area 135 is located is staggered with the heat exchange area 135.

[0439] In this embodiment, the connecting beam 160 can be installed on the connecting portion 142, and the connecting beam 160 can be assembled by bending multiple plates. In the plate of the connecting beam 160 facing the heat exchange zone 135, at least one of the end facing the plate assembly 130 and the end facing away from the plate assembly 130 is bent away from the heat exchange zone 135, so that the connecting beam 160 will not occupy the space corresponding to the heat exchange zone 135 for the installation of the battery cell 200, so that the heat exchange zone 135 can accommodate more battery cells 200 for installation, thereby increasing the number of battery cells 200 in the battery 1100 and improving the energy density of the battery 1100.

[0440] In other embodiments of the present application, as shown in combination with FIG. 2 and FIG. 3 , a battery 1100 is provided, including the box 100 as described in the above embodiment.

[0441] The battery 1100 of the embodiment of the present application adopts the above-mentioned box body 100. The box body 100 has high assembly efficiency, which is conducive to reducing the production cost of the battery 1100.

[0442] Please also refer to FIG. 32 , which is a schematic diagram of the structure of batteries provided in some other embodiments of the present application.

[0443] In other embodiments of the present application, as shown in FIG. 32 , a battery 1100 is provided that further includes a mounting member 170 for mounting the battery 1100 , and the mounting member 170 is connected to the first steel-aluminum composite plate 131 .

[0444] The mounting member 170 may be a component that connects the battery 1100 to the electrical device and secures the battery 1100 within the electrical device. The mounting member 170 may be formed by bending a plate or a beam structure. The mounting member 170 may be secured within the electrical device using bolts, rivets, or the like.

[0445] The mounting member 170 is connected to the first steel-aluminum composite plate 131 . It is understandable that the mounting member 170 can be connected to the first steel-aluminum composite plate 131 by welding, clamping, screwing, or the like.

[0446] By adopting the technical solution of this embodiment, the mounting member 170 is connected to the first steel-aluminum composite plate 131, so that the mounting member 170 and the first steel-aluminum composite plate 131 are integrated, which is conducive to improving the integration of the battery 1100. In addition, the first steel-aluminum composite plate 131 has a large area, which allows for flexible arrangement of the mounting member 170, thereby improving the mounting reliability of the battery 1100.

[0447] In other embodiments of the present application, referring to FIG. 32 , the first steel plate layer 1311 is welded to the mounting member 170 .

[0448] As an example, as shown in FIG32 , the first steel plate layer 1311 is located between the mount 170 and the first aluminum plate layer 1312 to facilitate welding to the mount 170. In other examples, the first aluminum plate layer 1312 may be located on the side of the first steel plate layer 1311 facing the mount 170, and the first steel plate layer 1311 is stripped of aluminum in the welding area with the mount 170, thereby facilitating welding of the first steel plate layer 1311 to the mount 170.

[0449] Generally, the mounting member 170 is made of steel, so that the mounting member 170 has good structural strength to achieve stable mounting of the battery 1100 ; it also enables the mounting member 170 to be welded to the first steel plate layer 1311 .

[0450] By adopting the technical solution of this embodiment, the first steel plate layer 1311 is welded to the mounting member 170 , which can reduce the use of bolts, reduce the number of parts, and improve the assembly efficiency of the battery 1100 .

[0451] In other embodiments of the present application, referring to FIG. 3 and FIG. 4 , the battery 1100 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 131 .

[0452] 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 131 by welding, clamping, bonding, screwing, or the like.

[0453] By adopting the technical solution of this embodiment, the first steel-aluminum composite panel 131 has good structural strength and can serve as a mounting base for the seat beam 300, so that the seat beam 300 and the plate assembly 130 of the battery 1100 are integrated, which is beneficial to improving the integration of the vehicle 1000 and reducing the manufacturing cost of the vehicle 1000.

[0454] In other embodiments of the present application, referring to FIG. 3 to FIG. 6 , the seat beam 300 is welded to the first steel plate layer 1311 .

[0455] As an example, referring to Figures 3 to 6 , the first steel plate layer 1311 is positioned between the first aluminum plate layer 1312 and the seat beam 300 to facilitate welding to the seat beam 300. In other examples, the first aluminum plate layer 1312 may be positioned on the side of the first steel plate layer 1311 facing the seat beam 300, and the first steel plate layer 1311 may be stripped of aluminum in the area where it is welded to the seat beam 300, thereby facilitating welding of the first steel plate layer 1311 to the seat beam 300.

[0456] 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; it also enables the seat beam 300 to be welded to the first steel plate layer 1311.

[0457] By adopting the technical solution of this embodiment, the seat beam 300 is welded to the first steel plate layer 1311 , which can reduce the number of bolts used and improve the assembly efficiency of the vehicle 1000 .

[0458] In other embodiments of the present application, referring to FIG. 1 , an electrical device is provided, including the battery 1100 as described in the above embodiment.

[0459] The electric device of the embodiment of the present application adopts the above-mentioned battery 1100. The manufacturing cost of the battery 1100 is low, which helps to reduce the manufacturing cost of the electric device.

[0460] In other embodiments of the present application, the electrical device is a vehicle 1000 , and the first steel-aluminum composite panel 131 forms a floor of the vehicle 1000 .

[0461] The floor of vehicle 1000 is a structure located at the bottom of the interior of vehicle 1000. It supports various components and equipment of vehicle 1000 and serves as a connection between them. Generally, the floor is made of high-strength materials, such as steel plates, to ensure the stability and safety of vehicle 1000.

[0462] By adopting the technical solution of this embodiment, the first steel-aluminum composite panel 131 has good structural strength and can be used directly as the floor of the vehicle 1000. This eliminates the need for an additional floor, helps reduce the number of components of the vehicle 1000, improves the structural compactness and integration of the vehicle 1000, reduces the manufacturing cost of the vehicle 1000, and also facilitates the realization of CTB (Cell to Body).

[0463] In some CTB solutions adopted by the vehicle 1000, the heat exchanger of the battery 1100 is usually arranged at the bottom or side of the battery cell 200, and the top plate of the box body 100 is usually made of sheet metal structure, which is heavy and increases the cost. In some solutions that use the heat exchanger as the top plate of the box body 100, the heat exchanger is usually made of 3 series aluminum. However, 3 series aluminum has poor yield strength, and the heat exchanger as the floor of the vehicle 1000 has poor strength and cannot meet the operating conditions of the entire vehicle. In addition, the heat exchanger cannot be integrated with the steel mounting part 170, resulting in a low degree of integration of the vehicle 1000.

[0464] In some embodiments of the present application, the electrical device provided has a plate assembly 130 including a first steel-aluminum composite plate 131 and an aluminum plate 1321. The first steel-aluminum composite plate 131 and the aluminum plate 1321 are arranged to form a heat exchange channel 133. The first steel-aluminum composite plate 131 and the aluminum plate 1321 form the top plate of the box body 100. The heat exchange component and the top plate of the box body 100 are integrated into one, which is beneficial to the top water cooling of the battery 1100 and improves the integration of the battery 1100. Since the first steel-aluminum composite plate 131 has good structural strength, it can be used as the floor of the vehicle 1000. In addition, the first steel plate layer 1311 in the first steel-aluminum composite plate 131 can be welded to the mounting part 170 and the seat beam 300, thereby improving the integration of the vehicle 1000 and enhancing the rigidity of the battery 1100, thereby achieving lightweighting of the vehicle 1000 and reducing costs.

[0465] 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.

[0466] 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: a steel frame, the steel frame enclosing a receiving cavity and a first opening communicating with the receiving cavity; A plate assembly covers the first opening, the plate assembly 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, and the first steel plate layer is welded to the steel frame.

2. The housing according to claim 1, wherein: The plate assembly further includes a plate member, which is stacked with the first steel-aluminum composite plate and surrounds a heat exchange channel for the flow of a heat exchange medium.

3. The housing according to claim 2, wherein: The panel member includes at least one of an aluminum plate and a second steel-aluminum composite plate.

4. The housing according to claim 3, wherein: In the case where the plate member 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 brazed to the first aluminum plate layer; In the case where the panel includes the second steel-aluminum composite panel, the second steel-aluminum composite panel 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.

5. The housing according to claim 4, wherein: In the case where the panel includes the second steel-aluminum composite panel, edges of the first steel-aluminum composite panel and the second steel-aluminum composite panel overlap to form an overlapping area, and the overlapping area is welded to the steel frame.

6. The box according to claim 4 or 5, wherein: In the case where the panel comprises the second steel-aluminum composite panel, the first aluminum plate layer and the second aluminum plate layer are brazed.

7. The box according to any one of claims 2 to 6, wherein: The plate member is located on a side of the first steel-aluminum composite plate close to the receiving cavity.

8. The housing according to claim 7, wherein: The plate is a flat plate structure, and the first steel-aluminum composite plate is recessed toward the back of the plate to form the heat exchange channel.

9. The box according to any one of claims 2 to 8, wherein: The thickness of the plate is in the range of 0.3 mm to 3 mm.

10. The housing according to claim 9, wherein: The thickness of the plate is in the range of 0.5 mm to 1.5 mm.

11. The box according to any one of claims 2 to 10, wherein: The edge of the first steel-aluminum composite plate protrudes from the plate component to form a protruding portion, and the first steel plate layer of the protruding portion is welded to the steel frame.

12. The box according to any one of claims 1 to 11, wherein: The box body also includes a heat exchange tube for allowing heat exchange medium to flow, and the heat exchange tube is connected to the first steel-aluminum composite plate.

13. The housing according to claim 12, wherein: The heat exchange tube is an aluminum tube, the first aluminum plate layer is located between the aluminum tube and the first steel plate layer, and the aluminum tube is welded to the first aluminum plate layer.

14. The housing according to claim 13, wherein: The aluminum tube is brazed to the first aluminum plate layer.

15. The box according to any one of claims 12 to 14, wherein: The heat exchange tubes are provided on the side of the first steel-aluminum composite plate facing away from the accommodating cavity and / or on the side facing the accommodating cavity.

16. The housing according to claim 15, wherein: In the case where the heat exchange tube is located on the side of the first steel-aluminum composite plate facing away from the receiving cavity, the heat exchange tube is bent to form a hollow area, and the first steel-aluminum composite plate is provided with a convex portion, and the convex portion is located in the hollow area; In a case where the heat exchange tube is located on a side of the first steel-aluminum composite plate facing the accommodating cavity, the first steel-aluminum composite plate is provided with a groove, and at least a portion of the heat exchange tube is located in the groove.

17. The box according to any one of claims 1 to 16, wherein: The steel frame and the first steel plate layer are laser welded, resistance spot welded or arc welded.

18. The box according to any one of claims 1 to 16, wherein: The steel frame and the first steel plate layer are laser welded with filler wire.

19. The box according to any one of claims 1 to 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 steel frame.

20. The housing according to any one of claims 1 to 19, wherein: The steel frame includes a frame body and a connecting portion connected to each other. The frame body surrounds the receiving cavity. The connecting portion is located on the side of the frame body facing the receiving cavity. The connecting portion is welded to the first steel plate layer.

21. The housing according to claim 20, wherein: The edge of the first steel-aluminum composite plate is overlapped with the connecting portion, and the edge of the first steel-aluminum composite plate is welded to the connecting portion.

22. The housing according to claim 21, wherein: The end of the connecting portion facing away from the frame is welded to the edge of the first steel plate layer; and / or the middle portion of the connecting portion is welded to the edge of the first steel plate layer.

23. The box according to any one of claims 20 to 22, wherein: An edge of the first steel-aluminum composite plate abuts against a surface of the connecting portion facing the receiving cavity.

24. The housing according to any one of claims 1 to 22, wherein: An edge of the first steel-aluminum composite panel abuts against an end surface of the steel frame located on the same side as the first opening.

25. The housing according to any one of claims 1 to 24, wherein: The periphery of the first steel plate layer is welded to the steel frame.

26. The housing according to any one of claims 1 to 25, wherein: The thickness of the first steel plate layer is greater than the thickness of the first aluminum plate layer.

27. The housing according to any one of claims 1 to 26, wherein: The thickness of the first steel plate layer ranges from 0.3 mm to 3 mm.

28. The housing of claim 27, wherein: The thickness of the first steel plate layer ranges from 0.5 mm to 2 mm.

29. The housing according to any one of claims 1 to 28, wherein: The thickness of the first aluminum plate layer ranges from 0.02 mm to 1 mm.

30. The housing of claim 29, wherein: The thickness of the first aluminum plate layer ranges from 0.05 mm to 0.3 mm.

31. The housing according to any one of claims 1 to 30, 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 main body portion and a flange portion; The first steel plate layer of the flange portion is welded to the steel frame; and / or the first steel plate layer of the main body portion is welded to the steel frame.

32. The housing of claim 31 , wherein: The included angle between the flange portion and the main body portion is α, wherein 90°≤α<180°.

33. The housing of claim 32, wherein: 90°≤α≤110°。 34. A casing according to claim 32 or 33, wherein: At least a portion of the flange portion is inserted into the receiving cavity.

35. The housing of claim 34, wherein: The first steel plate layer of the flange portion abuts against a surface of the steel frame facing the receiving cavity.

36. The housing of claim 31 , wherein: The included angle between the flange portion and the main body portion is α, wherein 0°≤α<90°.

37. The housing of claim 36, wherein: 0°≤α≤10°。 38. The housing according to any one of claims 31 to 37, wherein: The flanging portion includes a bending section and a flanging section, the bending section is connected between the flanging section and the main body; the first steel plate layer of the bending section is welded to the steel frame.

39. The housing according to any one of claims 1 to 38, wherein: The box body further includes a connecting beam located in the receiving cavity, wherein the connecting beam is connected to the first steel-aluminum composite plate via a fastener; Alternatively, the connecting beam is located on a side of the first steel plate layer facing away from the first aluminum plate layer, and the connecting beam is welded to the first steel plate layer; Alternatively, the plate assembly further includes a second steel-aluminum composite plate, the second steel-aluminum composite plate being located between the connecting beam and the first steel-aluminum composite plate, the second steel-aluminum composite plate including a second steel plate layer and a second aluminum plate layer stacked together, the first aluminum plate layer and the second aluminum plate layer being located between the first steel plate layer and the second steel plate layer, and the second steel plate layer being welded to the connecting beam.

40. The housing according to any one of claims 1 to 39, wherein: The box body further includes a connecting beam located in the receiving cavity, a heat exchange area is formed on the surface of the plate assembly facing the connecting beam, and a projection of the connecting beam on the plane where the heat exchange area is located is staggered with the heat exchange area.

41. The housing according to any one of claims 1 to 40, wherein: The top plate of the box body and / or the bottom plate of the box body include the plate assembly.

42. A battery, wherein: A box comprising the box according to any one of claims 1 to 41.

43. The battery of claim 42, wherein: The battery further includes a mounting member for mounting the battery, and the mounting member is connected to the first steel-aluminum composite plate.

44. The battery of claim 43, wherein: The first steel plate layer is welded to the mounting component.

45. The battery according to any one of claims 42 to 44, wherein: The battery also includes a seat beam for connecting a whole vehicle seat, and the seat beam is connected to the first steel-aluminum composite panel.

46. ​​The battery of claim 45, wherein: The seat beam is welded to the first steel plate layer.

47. An electrical device, wherein: A battery comprising the battery according to any one of claims 42 to 46.

48. The electrical device according to claim 47, wherein: The electrical device is a vehicle, and the first steel-aluminum composite panel forms a floor of the vehicle.

Images