Battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery device and electric equipment. The battery device comprises a battery monomer assembly and a box body, the battery cell assembly includes at least one battery cell. The box body comprises a cover body and a seat body, the cover body and the seat body define at least part of accommodating space, the battery monomer assembly is positioned in the accommodating space, at least one of the cover body and the seat body is provided with a composite area and a reinforcing area, the composite area and the reinforcing area both face the accommodating space, and the composite area comprises a framework structure and a first coating structure; the framework structure is provided with a plurality of hollowed-out portions, the first wrapping structure wraps at least part of the framework structure and fills the hollowed-out portions, the reinforcing area comprises a reinforcing plate, and the reinforcing plate is connected to the framework structure. The weight of the box body can be reduced, and the reliability of the box body is also considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery device and an electric device. BACKGROUND

[0002] Battery devices are widely used in electronic devices, such as electric vehicles, electric cars, electric aircraft, electric ships, and the like.

[0003] In the development of battery technology, how to reduce the weight of the box while considering its reliability is a research direction in battery technology. CONTENT OF THE INVENTION

[0004] The present application provides a battery device and an electric device, which can reduce the weight of the box while considering its reliability.

[0005] The present application provides a battery device, which comprises a battery monomer assembly and a box. The battery monomer assembly comprises at least one battery monomer. The box comprises a cover body and a seat body, and the cover body and the seat body surround to form an accommodation space, and the battery monomer assembly is located in the accommodation space. At least one of the cover body and the seat body is provided with a composite area and a reinforcing area, and the composite area and the reinforcing area both face the accommodation space. The composite area comprises a framework structure and a first cladding structure, the framework structure has a plurality of hollow parts, and the first cladding structure is wrapped around the framework structure and fills the hollow parts. The reinforcing area comprises a reinforcing plate, and the reinforcing plate is connected to the framework structure.

[0006] In the above technical solution, the battery device of the present application sets the composite area and the reinforcing area in at least one of the cover body and the seat body, sets the framework structure in the composite area, and sets the reinforcing plate in the reinforcing area. In this way, the combination of the framework structure and the first cladding structure helps to reduce the weight of the box, and the setting of the reinforcing plate can enhance the area with high structural strength requirement of the box, so that the box meets the structural strength requirement while reducing the weight.

[0007] In some embodiments, the bending strength of the material of the reinforcing plate is greater than the bending strength of the material of the first cladding structure.

[0008] In the above technical solution, the structural strength of the box is further improved, and the reliability of the box is improved.

[0009] In some embodiments, the density of the material of the first cladding structure is less than the density of the material of the framework structure.

[0010] In the above technical solution, the weight of the composite area can be reduced, thereby reducing the weight of the box.

[0011] In some embodiments, the framework structure comprises a plurality of first ribs and a plurality of second ribs, and the plurality of first ribs and the plurality of second ribs are cross-set and form a plurality of hollow parts.

[0012] In the technical solution, the skeleton structure is arranged as a net structure, the load bearing capacity of the skeleton structure can be adjusted by changing the number and interval of the first and second ribs, and the net structure can form a high adhesion with the first covering structure, thereby improving the combination strength of the two.

[0013] In some embodiments, the reinforcing plate is directly connected with the skeleton structure.

[0014] In the technical solution, the two are directly connected, the use of intermediate elements is omitted, and the structure is simplified.

[0015] In some embodiments, one of the cover body and the seat body comprises a wall body and first, second, third and fourth side walls connected with the wall body respectively, the first and second side walls are oppositely arranged along a first direction, the third and fourth side walls are oppositely arranged along a second direction, the other of the cover body and the seat body is oppositely arranged with the wall body along a third direction, the first, second, third and fourth directions are intersected with each other, the battery monomer assembly is connected to the wall body, and at least one of the first, second, third and fourth side walls comprises a reinforcing plate.

[0016] In the technical solution, the reinforcing plate arranged in at least one of the first, second, third and fourth side walls can improve the lateral extrusion resistance of the battery device, thereby improving the safety of the battery device, and the reinforcing plate can be used to connect with other structures of the box body, thereby improving the connection strength.

[0017] In some embodiments, the wall body comprises a reinforcing plate, and at least part of the reinforcing plate of the wall body is directly and angularly connected with the reinforcing plate of the first, second, third or fourth side wall.

[0018] In the technical solution, the overall structural strength of the wall body and the side wall can be improved, and the problem that the corner connection between the wall body and the side wall is easily damaged due to stress concentration can be solved.

[0019] In some embodiments, the battery device further comprises a bracket, the bracket is arranged on at least one of the first, second, third and fourth side walls, and the bracket is located outside the accommodation space, the bracket is connected with the reinforcing plate, and the bracket is used to mount a wire harness or a pipeline.

[0020] In the technical solution, the bracket is connected with the reinforcing plate, which not only facilitates the connection of the bracket, but also improves the connection strength of the bracket and the box body.

[0021] In some embodiments, the surface of the battery cell along the thickness direction thereof is opposite to the first sidewall and the second sidewall; the third sidewall and the fourth sidewall are each provided with a reinforcing plate; and the battery device further comprises a limiting beam, two ends of the limiting beam being connected to the reinforcing plate of the third sidewall and the reinforcing plate of the fourth sidewall respectively, the limiting beam being used to limit the expansion of the battery cell.

[0022] In the above technical solution, the limiting beam is connected to the third sidewall and the fourth sidewall, which not only facilitates the connection of the limiting beam with the cover body or the seat body, but also can better limit the expansion of the battery cell.

[0023] In some embodiments, the reinforcing area further comprises a second cladding structure, the second cladding structure being wrapped on at least part of the reinforcing plate.

[0024] In the above technical solution, the second cladding structure is wrapped on the reinforcing plate, which can protect the reinforcing plate and reduce the possibility of rusting, and also improve the structural strength of the reinforcing area.

[0025] In some embodiments, the material of the framework structure is steel or aluminum alloy, and / or the first cladding structure is a plastic structure, and / or the reinforcing plate is a steel plate or an aluminum alloy plate.

[0026] In the above technical solution, the framework structure and the reinforcing plate can have high structural strength while taking into account the cost.

[0027] In a second aspect, the embodiments of the present application further provide a power-using device, comprising the above battery device, the battery device being used to store or provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0029] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0030] Figure 2 The structural schematic diagram of a battery device is provided for some embodiments of the present application;

[0031] Figure 3 The structural schematic diagram of a battery cell assembly is provided for some embodiments of the present application;

[0032] Figure 4 A structural schematic diagram of a seat body is provided for some embodiments of the present application;

[0033] Figure 5 Another structural schematic diagram of a seat provided in some embodiments of the present application;

[0034] Figure 6 for Figure 5 Cross-sectional view at AA;

[0035] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0036] The reference numerals for the specific embodiments are as follows:

[0037] 100, vehicle; 200, battery device; 300, controller; 400, motor; 210, battery cell assembly; 220, battery cell; 221, busbar; 230, housing; 240, cover; 250, seat; 260, storage space; 270, bracket; 280, limiting beam;

[0038] 1. Composite area; 11. Skeleton structure; 111. Hollow portion; 112. First rib; 113. Second rib; 12. First covering structure;

[0039] 2. Reinforced area; 21. Reinforced plate;

[0040] 31. Wall; 32. First side wall; 33. Second side wall; 34. Third side wall; 35. Fourth side wall;

[0041] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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 drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0044] Reference to "an embodiment" or "the embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" or "in the embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive.

[0045] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0046] The term "and / or" in this application is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0047] In the embodiments of the application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0048] "Multiple" appearing in this application means two or more (including two).

[0049] In this application, the battery monomer can include a lithium ion secondary battery monomer, a lithium ion primary battery monomer, a lithium-sulfur battery monomer, a sodium lithium ion battery monomer, a sodium ion battery monomer or a magnesium ion battery monomer, etc. The embodiments of the application are not limited thereto. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of the application are not limited thereto.

[0050] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating area coated with the positive electrode active material layer and a positive electrode tab connected to the positive electrode coating area and not coated with the positive electrode active material layer. Taking a lithium ion battery cell as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area coated with the negative electrode active material layer and a negative electrode tab connected to the negative electrode coating area and not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon. The material of the separator can be polypropylene (PP) or polyethylene (PE).

[0051] The battery device generally includes a box body and a battery cell assembly, and the battery cell assembly is accommodated in the box body. The existing box body is generally made of metal materials, such as steel or aluminum. Although the metal material has high structural strength, the weight is often large, making it difficult to achieve lightweight of the battery device.

[0052] In order to achieve lightweight, the above-mentioned metal plate is improved to include a skeleton structure and a first cladding structure, and the first cladding structure is wrapped on the outside of the skeleton structure, thereby reducing the weight of the box body.

[0053] It is found through research that although the box body structure reduces the weight, the structural strength of individual areas is not enough, for example, it cannot meet the requirement of resisting deformation or cannot integrate other components.

[0054] Therefore, the battery device provided by the present application sets a composite area and a reinforcing area in at least one of the cover body and the seat body, sets a skeleton structure in the composite area, the skeleton structure is provided with a hollow part, and a first cladding structure wraps the skeleton structure and fills the hollow part, thereby reducing the weight of the box body. Moreover, the reinforcing area is provided with a reinforcing plate, and the reinforcing plate is connected with the skeleton structure. In this way, the setting of the reinforcing plate improves the structural strength of the box body, improves the reliability of the box body, and the setting of the reinforcing plate also facilitates the integration of other components of the battery device.

[0055] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0056] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0057] Figure 1 A schematic structural diagram of a vehicle 100 provided in some embodiments of the present application.

[0058] like Figure 1 As shown, a battery device 200 is provided inside the vehicle 100, and the battery device 200 can be provided at the bottom, head, or tail of the vehicle 100. The battery device 200 can be used to power the vehicle 100, for example, the battery device 200 can serve as an operating power source for the vehicle 100.

[0059] The vehicle 100 may further include a controller 300 and a motor 400 . The controller 300 is used to control the battery device 200 to supply power to the motor 400 , for example, to meet the power requirements of the vehicle 100 during startup, navigation, and driving.

[0060] In some embodiments of the present application, the battery device 200 can not only serve as the operating power source of the vehicle 100, but also serve as the driving power source of the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0061] Figure 2 This is a schematic diagram of the structure of a battery device 200 provided in some embodiments of the present application. Figure 3 This is a schematic structural diagram of a battery cell assembly 210 provided in some embodiments of the present application. Figure 4 A schematic structural diagram of a seat provided in some embodiments of the present application.

[0062] like Figures 2 to 4 As shown, battery device 200 includes a battery cell assembly 210 and a housing 230. Housing 230 includes a cover 240 and a base 250. Cover 240 and base 250 enclose a storage space 260. Battery cell assembly 210 is located in storage space 260 and includes at least one battery cell 220. At least one of cover 240 and base 250 is provided with a composite region 1 and a reinforcement region 2. Both composite region 1 and reinforcement region 2 face storage space 260. Composite region 1 includes a skeleton structure 11 and a first encapsulating structure 12. Skeleton structure 11 has multiple hollow portions 111. First encapsulating structure 12 wraps around skeleton structure 11 and fills hollow portions 111. Reinforcement region 2 includes a reinforcement plate 21 connected to skeleton structure 11.

[0063] The battery device 200 mentioned in the embodiment of the present application may include one or more battery cell assemblies 210 for providing voltage and capacity. The battery cell assembly 210 may include multiple battery cells 220, which are connected in series, parallel, or hybrid via a busbar 221.

[0064] In some embodiments, the battery cell assembly 210 is formed by arranging a plurality of battery cells 220. For example, the battery cell assembly 210 may be a battery module, which is formed by arranging and fixing a plurality of battery cells 220 to form an independent module. For example, the battery module may be formed by bundling a plurality of battery cells 220 with a cable tie.

[0065] In some embodiments, the battery device 200 may be a battery pack, which includes a case 230 and one or more battery cell assemblies 210 . The battery cell assemblies 210 are housed in the case 230 .

[0066] As an example, the battery cell assembly 210 may be a battery module, and the battery cell assembly 210 may be accommodated in the box 230 by fixing the battery module in the box 230 .

[0067] As an example, the battery cell assembly 210 may also be housed in the box body 230 by directly fixing the plurality of battery cells 220 to the box body 230 .

[0068] In some embodiments, the battery device 200 is an energy storage device, which includes a housing 230 with a door on at least one side of the housing 230. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0069] The cover 240 or the base 250 of this embodiment may have an opening, or may simply be a plate-shaped structure.

[0070] In this embodiment, the composite area 1 and the reinforcement area 2 both face the accommodation space 260 , that is, the composite area 1 and the reinforcement area 2 are located in different areas of the cover 240 or the base 250 , and are not located in the same area.

[0071] For example, the skeleton structure 11 may be a plate-like member with a plurality of through holes provided thereon. The through holes may be circular, rectangular, or diamond-shaped, and the through holes are the hollow portions 111. Optionally, the skeleton structure 11 is made of metal material.

[0072] For example, the first covering structure 12 can wrap the skeleton structure 11 and fill the hollow portion 111 by spraying or blistering.

[0073] Optionally, the first cladding structure 12 is provided with a reserved area in the area where the framework structure 11 is located. The framework structure 11 is connected to other components of the battery device, such as a bracket, a beam, etc. in the reserved area. For example, the reserved area can be a groove structure. The groove structure exposes one side of the framework structure 11, so that the bracket or the beam is connected to the framework structure 11, such as welding, through the opening area of the groove structure. The reserved area can also be a through hole. The through hole exposes both sides of the framework structure 11, so that the framework structure 11 is connected to the components on both sides, such as welding.

[0074] The reinforcing plate 21 of the embodiment can be made of a metal material, i.e., the reinforcing plate 21 is a metal plate. Of course, other plate materials, such as carbon fiber composite plates, can also be used.

[0075] The reinforcing plate 21 of the embodiment is connected to the framework structure 11. The reinforcing plate 21 can be directly connected to the framework structure 11, or indirectly connected to the framework structure 11 through other structures, such as being wrapped by a second cladding structure. The second cladding structure is integrally connected to the first cladding structure 12. The reinforcing plate 21 is indirectly connected to the framework structure 11 through the second cladding structure and the first cladding structure 12.

[0076] The composite area 1 of the embodiment can be connected to the reinforcing area 2, or can be spaced apart. The position of the reinforcing plate 21 of the embodiment is determined according to actual needs. Specifically, the reinforcing plate 21 can be arranged in a load-bearing area of the cover body 240 or the seat body 250 for bearing the weight of the battery monomer assembly 210. The reinforcing plate 21 can also be arranged in a side wall area of the cover body 240 or the seat body 250. The cover body 240 and the seat body 250 are arranged along the third direction Z. The side wall area refers to the area of the cover body 240 or the seat body 250 surrounding the third direction Z.

[0077] The battery device 200 of the embodiment is provided with the composite area 1 and the reinforcing area 2 in at least one of the cover body 240 and the seat body 250. The framework structure 11 and the first cladding structure 12 are arranged in the composite area 1. The reinforcing plate 21 is arranged in the reinforcing area 2. In this way, the combined use of the framework structure 11 and the first cladding structure 12 is conducive to reducing the weight of the box body 230. The arrangement of the reinforcing plate can enhance the area of the box body 230 which has a higher requirement for structural strength, so that the box body 230 meets the requirement for structural strength while reducing the weight.

[0078] In some embodiments, the bending strength of the material of the reinforcing plate 21 is greater than the bending strength of the material of the first cladding structure 12.

[0079] The bending strength of this embodiment refers to the maximum stress value of the material of the reinforcing plate 21 or the first cladding structure 12 before it breaks or yields under a bending load, and is used to measure the ability of the material to resist bending deformation and fracture.

[0080] Optionally, the bending strength of the material of the reinforcing plate 21 is measured using GB / T 232-2010 or GB / T 1449-2005.

[0081] Optionally, the bending strength of the first covering structure 12 is measured using GB / T 9341-2008 or GB / T 1449-2005.

[0082] This configuration further improves the structural strength of the box body 230 and enhances the reliability of the box body 230 .

[0083] In some embodiments, the density of the material of the first encapsulation structure 12 is less than the density of the material of the skeleton structure 11 .

[0084] The density in this embodiment refers to a physical quantity that describes the mass per unit volume of the material of the first coating structure 12 and the skeleton structure 11 , and indicates the degree of compactness.

[0085] For example, the density test method of the first coating structure 12 may be GB / T 1033.1-2022, and the density test method of the skeleton structure 11 may be GB / T 3850-2015.

[0086] This configuration can reduce the weight of the composite area 1 and thus reduce the weight of the box 230 .

[0087] Optionally, the material of the first covering structure 12 may be plastic or a composite material based on plastic, for example, polycarbonate, nylon, glass fiber reinforced nylon or carbon fiber reinforced plastic.

[0088] Optionally, the skeleton structure 11 is made of metal material.

[0089] In some embodiments, the skeleton structure 11 includes a plurality of first ribs 112 and a plurality of second ribs 113, the plurality of first ribs 112 extend in the same direction and are spaced apart, the plurality of second ribs 113 extend in the same direction and are spaced apart, the extension direction of the first ribs 112 intersects with the extension direction of the second ribs 113, the plurality of first ribs 112 and the plurality of second ribs 113 are connected into a mesh structure, and a plurality of hollow portions 111 are formed.

[0090] In this embodiment, the multiple first ribs 112 extending in the same direction means that the multiple first ribs 112 extend along the same direction.

[0091] Exemplarily, the first rib 112 can be a straight strip structure, and the plurality of first ribs 112 are substantially parallel.

[0092] Exemplarily, the first rib 112 can also be a curved strip structure, and the plurality of first ribs 112 have substantially consistent bending directions.

[0093] The plurality of second ribs 113 of the embodiment also extend in the same direction, which will not be described herein.

[0094] The extension direction of the first rib 112 of the embodiment intersects with the extension direction of the second rib 113, and the intersection angle can be an acute angle, an obtuse angle or a right angle.

[0095] Exemplarily, the plurality of first ribs 112 are straight strip structures and parallel to each other, and the plurality of second ribs 113 are straight strip structures and parallel to each other.

[0096] The shape of the hollow part 111 of the embodiment can be a square, a rhombus or a parallelogram.

[0097] The skeleton structure 11 is provided in a mesh structure, and the load bearing capacity of the skeleton structure 11 can be adjusted by changing the number and spacing of the first ribs 112 and the second ribs 113. In addition, the mesh structure can form a high adhesion with the first cladding structure 12, thereby improving the bonding strength of the two.

[0098] In some embodiments, the reinforcing plate 21 is directly connected to the skeleton structure 11.

[0099] The reinforcing plate 21 of the embodiment is directly connected to the skeleton structure 11, that is, there is no other adapter structure between the two, and the two are directly connected. Specifically, the two can be directly connected by welding or one-piece forming.

[0100] Directly connecting the two can save the use of intermediate elements, which is conducive to simplifying the structure.

[0101] Figure 5 Another structural schematic diagram of the seat body provided for some embodiments of the application.

[0102] Please refer to Figure 4 and Figure 5In some embodiments, one of the cover 240 and the base 250 comprises a wall 31, and a first side wall 32, a second side wall 33, a third side wall 34 and a fourth side wall 35 connected to the wall 31 respectively, the first side wall 32 and the second side wall 33 are oppositely arranged along a first direction X, the third side wall 34 and the fourth side wall 35 are oppositely arranged along a second direction Y, the other one of the cover 240 and the base 250 is oppositely arranged with the wall 31 along a third direction Z, the first direction X, the second direction Y and the third direction Z are perpendicular to each other, the battery monomer assembly 210 is connected to the wall 31, and at least one of the first side wall 32, the second side wall 33, the third side wall 34 and the fourth side wall 35 comprises a reinforcing plate 21.

[0103] For example, the first side wall 32, the third side wall 34, the second side wall 33 and the fourth side wall 35 are sequentially connected end to end to form a ring structure.

[0104] Optionally, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0105] By arranging the reinforcing plate 21 in at least one of the first side wall 32, the second side wall 33, the third side wall 34 and the fourth side wall 35, the lateral extrusion resistance of the battery device 200 is improved, thereby improving the safety of the battery device 200; and the reinforcing plate 21 can be used to connect with other structures of the box 230 to improve the connection strength. The other structures can be a limiting beam 280 for limiting the expansion of the battery monomer or a bracket for mounting a wire harness or a pipeline. Specifically, the cover 240 is connected to the battery monomer 220, and the cover 240 bears the weight, and the base 250 is connected to the battery monomer 220, and the base 250 bears the weight.

[0106] For example, the wall 31 comprises a composite area 1 and a reinforcing area 2. Optionally, for the wall 31, the reinforcing area 2, the composite area 1 and the reinforcing area 2 are sequentially arranged along the first direction X or the second direction Y. Further optionally, for the wall 31, the reinforcing plate 21 is arranged around the periphery of the composite area 1.

[0107] For example, at least one of the first side wall 32, the second side wall 33, the third side wall 34 and the fourth side wall 35 comprises a composite area 1.

[0108] Optionally, the wall 31 comprises a reinforcing plate 21, and the reinforcing plate 21 of the wall 31 is directly connected to the framework structure 11 of the wall 31.

[0109] The direct connection of the present embodiment means that the two are connected by integral molding, welding or other methods without the aid of other connecting parts.

[0110] The reinforcing plate 21 of the wall 31 of the present embodiment can be located at any area of the wall 31 where strength needs to be improved, such as the central area or the edge area of the wall 31.

[0111] This configuration improves the overall strength of the reinforcing plate 21 and the skeleton structure 11 , thereby improving the structural strength of the wall 31 .

[0112] In some embodiments, the wall 31 includes a reinforcing plate 21 , and at least part of the reinforcing plate 21 of the wall 31 is directly and angledly connected to the reinforcing plate 21 of the first side wall 32 , the second side wall 33 , the third side wall 34 or the fourth side wall 35 .

[0113] The direct connection in this embodiment means that the reinforcing plate 21 of the wall body 31 and the reinforcing plate 21 of the side wall are directly connected by integral molding, welding, etc., without the aid of other transition structures.

[0114] The reinforcing plate 21 of the wall 31 of this embodiment may be connected to the reinforcing plate 21 of the first side wall 32, the second side wall 33, the third side wall 34 or the fourth side wall 35 at an obtuse angle, an acute angle or a right angle.

[0115] Such an arrangement can improve the overall structural strength of the wall body 31 and the side wall, and improve the problem that the corner connection between the wall body 31 and the side wall is easily damaged due to stress concentration.

[0116] Figure 6 for Figure 5 The cross-sectional view at AA, Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0117] See also Figure 6 and Figure 7 In some embodiments, the battery device 200 further includes a bracket 270, which is disposed on at least one of the first side wall 32, the second side wall 33, the third side wall 34, and the fourth side wall 35, and the bracket 270 is located outside the accommodating space 260. The bracket 270 is connected to the reinforcing plate 21, and the bracket 270 is used to install a wiring harness or a pipeline.

[0118] The bracket 270 of this embodiment is connected to the reinforcing plate 21 , which refers to the reinforcing plate 21 in the first side wall 32 , the second side wall 33 , the third side wall 34 or the fourth side wall 35 .

[0119] The bracket 270 and the reinforcing plate 21 of this embodiment can be connected by welding, threading or riveting.

[0120] Bracket 270 of this embodiment can be used to mount heat exchange tubes, which carry a heat exchange fluid for exchanging heat with battery cells 220. Bracket 270 can also be used to mount wiring harnesses for transmitting signals or current. Bracket 270 can also be used to mount a bottom guard plate, which is located below and protects the box body 230.

[0121] The bracket 270 is connected with the reinforcing plate 21, which not only facilitates the connection of the bracket 270, but also improves the connection strength of the bracket 270 and the box 230.

[0122] Please refer to Figure 4 In some embodiments, the surfaces of the battery monomer 220 along the thickness direction thereof are opposite to the first side wall 32 and the second side wall 33; the third side wall 34 and the fourth side wall 35 are both provided with the reinforcing plate 21; and the battery device 200 further comprises a limiting beam 280, two ends of the limiting beam 280 are connected to the reinforcing plate 21 of the third side wall 34 and the reinforcing plate 21 of the fourth side wall 35 respectively, and the limiting beam 280 is used to limit the expansion of the battery monomer 220.

[0123] For example, for a square battery monomer, the two surfaces opposite to each other with the largest area are opposite to the first side wall 32 and the second side wall 33.

[0124] The limiting beam 280 of the present embodiment limits the expansion of the battery monomer 220 by directly contacting the battery monomer 220 or indirectly applying pressure.

[0125] The end of the limiting beam 280 of the present embodiment and the reinforcing plate 21 can be connected by welding, threaded connection or riveting, etc.

[0126] The limiting beam 280 is connected to the third side wall 34 and the fourth side wall 35, which not only facilitates the connection of the limiting beam 280 and the cover 240 or the seat 250, but also can better limit the expansion of the battery monomer 220.

[0127] In some embodiments, the reinforcing area 2 further comprises a second cladding structure, and the second cladding structure wraps at least part of the reinforcing plate 21.

[0128] Optionally, the material of the second cladding structure can be plastic or a composite material with plastic as the base material, etc. For example, it can be polyethylene, polypropylene, polycarbonate, nylon, glass fiber reinforced nylon or carbon fiber reinforced plastic, etc.

[0129] The second cladding structure wraps the reinforcing plate 21, which can protect the reinforcing plate 21 and reduce the possibility of rusting, and also improve the structural strength of the reinforcing area 2.

[0130] In some embodiments, the material of the skeleton structure 11 is steel or aluminum alloy, and / or the first cladding structure 12 is a plastic structure, and / or the reinforcing plate 21 is a steel plate or an aluminum alloy plate.

[0131] When the skeleton structure 11 and the reinforcing plate 21 of the present embodiment are made of steel, stainless steel, galvanized steel or nickel-plated steel can be used.

[0132] In this way, the skeleton structure 11 and the reinforcing plate 21 have high structural strength and low cost.

[0133] The embodiment of the application further provides a power-using device, which comprises the battery device 200.

[0134] Please refer to Figures 4 to 7The present invention provides a battery device 200. The battery device 200 includes a battery cell assembly 210 and a housing 230. The housing 230 includes a cover 240 and a base 250. The cover 240 and base 250 enclose at least a portion of a storage space 260. The battery cell assembly 210 is located in the storage space 260 and includes a plurality of battery cells 220. The base 250 includes a composite region 1 and a reinforcement region 2. The composite region 1 and the reinforcement region 2 respectively face the storage space 260. The composite region 1 includes a skeleton structure 11 and a first encapsulating structure 12. The skeleton structure 11 has a plurality of hollow portions 111. The first encapsulating structure 12 wraps around the skeleton structure 11 and fills the hollow portions 111. The reinforcement region 2 includes a reinforcement plate 21 connected to the skeleton structure 11. The bending strength of the material of the reinforcement plate 21 is greater than the bending strength of the material of the first encapsulating structure 12. The density of the material of the first encapsulating structure 12 is lower than the density of the material of the skeleton structure 11. The skeleton structure 11 includes a plurality of first ribs 112 and a plurality of second ribs 113. The plurality of first ribs 112 extend in the same direction and are arranged at intervals. The plurality of second ribs 113 extend in the same direction and are arranged at intervals. The extension direction of the first ribs 112 intersects with the extension direction of the second ribs 113. The plurality of first ribs 112 and the plurality of second ribs 113 are connected into a network structure and form a plurality of hollow portions 111. One of the cover 240 and the base 250 includes a wall 31 and a first side wall 32, a second side wall 33, a third side wall 34, and a fourth side wall 35 respectively connected to the wall 31. The first side wall 32 and the second side wall 33 are arranged opposite each other along a first direction X, and the third side wall 34 and the fourth side wall 35 are arranged opposite each other along a second direction Y. The other of the cover 240 and the base 250 is arranged opposite each other to the wall 31 along a third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other. The battery cell assembly is connected to the wall 31. At least one of the first side wall 32, the second side wall 33, the third side wall 34, and the fourth side wall 35 includes a reinforcing plate 21. The wall 31 includes the reinforcing plate 21, and at least a portion of the reinforcing plate 21 of the wall 31 is directly and angularly connected to the reinforcing plate 21 of the first side wall 32, the second side wall 33, the third side wall 34, or the fourth side wall 35. The battery device 200 also includes a bracket 270, which is provided on at least one of the first side wall 32, the second side wall 33, the third side wall 34, and the fourth side wall 35. Bracket 270 is located outside the accommodating space 260 and is connected to the reinforcing plate 21. Bracket 270 is used to install wiring harnesses or piping. The thickness of the battery cell 220 faces the first and second side walls 32, 33. The third and fourth side walls 34, 35 are each provided with a reinforcing plate 21. The battery device 200 also includes a limiting beam 280, whose ends are connected to the reinforcing plates 21 of the third and fourth side walls 34, 35, respectively. Limiting beam 280 is used to limit the expansion of the battery cell 220.The reinforcement area 2 further includes a second covering structure, which wraps around at least a portion of the reinforcement plate 21 .

[0135] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0136] 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 of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery device, characterized in that: include: A battery cell assembly comprising at least one battery cell; The box body includes a cover body and a base body, wherein the cover body and the base body are arranged to form a receiving space, and the battery cell assembly is located in the receiving space. At least one of the cover body and the base body is provided with a composite area and a reinforcement area, both of which face the accommodating space, the composite area includes a skeleton structure and a first covering structure, the skeleton structure has a plurality of hollow parts, the first covering structure is wrapped around the skeleton structure and fills the hollow parts, the reinforcement area includes a reinforcement plate, and the reinforcement plate is connected to the skeleton structure.

2. The battery device according to claim 1, wherein: The bending strength of the material of the reinforcing plate is greater than the bending strength of the material of the first covering structure.

3. The battery device according to claim 1, wherein: The density of the material of the first coating structure is lower than the density of the material of the skeleton structure.

4. The battery device according to claim 1, wherein: The skeleton structure includes a plurality of first ribs and a plurality of second ribs, wherein the plurality of first ribs extend in the same direction and are arranged at intervals, and the plurality of second ribs extend in the same direction and are arranged at intervals, and the extension direction of the first ribs intersects with the extension direction of the second ribs, and the plurality of first ribs and the plurality of second ribs are connected into a mesh structure to form a plurality of the hollow portions.

5. The battery device according to claim 1, wherein: The reinforcing plate is directly connected to the skeleton structure.

6. The battery device according to claim 1, wherein: One of the cover body and the base body includes a wall body and a first side wall, a second side wall, a third side wall, and a fourth side wall respectively connected to the wall body, the first side wall and the second side wall are arranged opposite to each other along a first direction, the third side wall and the fourth side wall are arranged opposite to each other along a second direction, and the other of the cover body and the base body is arranged opposite to the wall body along a third direction, and the first direction, the second direction, and the third direction intersect with each other; The battery cell assembly is connected to the wall body, and at least one of the first side wall, the second side wall, the third side wall, and the fourth side wall includes the reinforcing plate.

7. The battery device according to claim 6, characterized in that The wall body includes the reinforcing plate, and at least a portion of the reinforcing plate of the wall body is directly and angledly connected to the reinforcing plate of the first side wall, the second side wall, the third side wall, or the fourth side wall.

8. The battery device according to claim 6, characterized in that The battery device also includes a bracket, which is arranged on at least one of the first side wall, the second side wall, the third side wall and the fourth side wall, and the bracket is located outside the accommodating space. The bracket is connected to the reinforcing plate and is used to install a wiring harness or a pipeline.

9. The battery device according to claim 6, characterized in that The surface of the battery cell along the thickness direction thereof is opposite to the first side wall and the second side wall; the third side wall and the fourth side wall are both provided with the reinforcing plate; The battery device further includes a limiting beam, both ends of which are respectively connected to the reinforcing plate of the third side wall and the reinforcing plate of the fourth side wall, and the limiting beam is used to limit the expansion of the battery cell.

10. The battery device according to any one of claims 1 to 9, characterized in that: The reinforcement area further includes a second covering structure, and the second covering structure wraps around at least a portion of the reinforcement plate.

11. The battery device according to any one of claims 1 to 9, characterized in that: The skeleton structure is made of steel or aluminum alloy, and / or the first covering structure is a plastic structure, and / or the reinforcing plate is a steel plate or an aluminum alloy plate.

12. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 11, wherein the battery device is used to store electrical energy or provide electrical energy.

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