Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a single battery and a box body, the box body comprises a frame, a bottom plate and a bearing part, the frame and the bottom plate define a containing space, and the single battery is arranged in the containing space. The bearing part is located on the outer side of the frame and connected to the frame, the bearing part comprises a first plate and a second plate, the first plate is connected with the second plate, the structural strength of the first plate is larger than that of the second plate, and the toughness of the second plate is larger than that of the first plate. According to the invention, the reliability of the battery device can be effectively improved.

Description

Technical Field

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

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, the reliability of battery devices will directly affect the reliability, cost of use and user experience of terminal products. Therefore, how to effectively improve the reliability of battery devices is a technical issue that needs to be continuously improved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can effectively improve the reliability of the battery device.

[0005] In the first aspect, an embodiment of the present application provides a battery device, the battery device includes a battery cell and a box body, the box body includes a frame, a bottom plate and a bearing portion, the frame and the bottom plate enclose a storage space, and the battery cell is arranged in the storage space. The bearing portion is located outside the frame and connected to the frame, the bearing portion includes a first plate and a second plate, the first plate and the second plate are connected, the structural strength of the first plate is greater than the structural strength of the second plate, and the toughness of the second plate is greater than the toughness of the first plate.

[0006] The above technical solution uses a first plate with high structural strength and a second plate with high toughness to form a bearing part. When the battery device is hit and squeezed, the first plate can provide strong support performance, and the second plate can deform and absorb energy. In this way, through the cooperation of the first plate and the second plate, not only can the bearing part have a higher bearing performance, but also the energy transferred to the battery cell can be reduced to reduce the risk of damage to the battery cell, thereby effectively improving the reliability of the battery device.

[0007] In some embodiments of the first aspect, a cavity is provided between the first plate and the second plate.

[0008] The above technical solution introduces a cavity between the first plate and the second plate. On the one hand, the cavity provides an energy-absorbing space for the bearing part, which can further reduce the energy transferred to the battery cell when the battery device is hit and squeezed; on the other hand, the cavity can also provide space for the deformation of the second plate when the battery device is hit and squeezed, thereby improving the deformation and energy-absorbing effect of the second plate. In short, the reliability of the battery device can be further improved.

[0009] In some embodiments of the first aspect, one end of the first plate along the first direction is connected to the frame, one end of the second plate along the first direction is connected to the frame, and the other end of the first plate along the first direction is connected to the other end of the second plate along the first direction. The first plate and the second plate are arranged opposite to each other along the second direction, and the first direction intersects the second direction.

[0010] In the above technical solution, when the battery device is hit or squeezed, both the first plate and the second plate can better realize their functions, so as to further improve the reliability of the battery device.

[0011] In some embodiments of the first aspect, the first board includes a first main body, a first connecting portion, and a second connecting portion, wherein the first connecting portion and the second connecting portion are respectively connected to two ends of the first main body along the first direction and extend along the second direction. The first connecting portion is attached to and connected to the frame, and the second connecting portion is connected to the second board.

[0012] The above technical solution can increase the contact area between the first plate and the frame to improve the connection firmness between the first plate and the frame, thereby further improving the reliability of the battery device.

[0013] In some embodiments of the first aspect, an extension direction of the first connection portion is opposite to an extension direction of the second connection portion.

[0014] The above technical solution can improve the structural stability of the first plate, thereby effectively improving the reliability of the bearing part.

[0015] In some embodiments of the first aspect, the second board includes a second main body, a third connecting portion and a fourth connecting portion, wherein the third connecting portion and the fourth connecting portion are respectively connected to two ends of the second main body along the first direction and extend along the second direction. The third connecting portion is attached to and connected to the frame, and the fourth connecting portion is connected to the second connecting portion.

[0016] The above technical solution can increase the contact area between the second plate and the frame to improve the connection firmness between the second plate and the frame, thereby further improving the reliability of the battery device.

[0017] In some embodiments of the first aspect, the fourth connection portion is attached to and connected to the second connection portion, and the fourth connection portion and the second connection portion at least partially overlap in the first direction.

[0018] The above technical solution can increase the contact area between the first plate and the second plate to improve the connection firmness between the first plate and the second plate, thereby effectively improving the reliability of the bearing part.

[0019] In some embodiments of the first aspect, the fourth connecting portion is attached to and connected to a side of the second connecting portion facing the cavity.

[0020] In the above technical solution, when the battery device is collided and squeezed, the second connection part can protect the fourth connection part, reducing the risk of failure of the bearing part due to breakage of the fourth connection part, thereby further improving the reliability of the battery device.

[0021] In some embodiments of the first aspect, an extension direction of the third connection portion is opposite to an extension direction of the fourth connection portion.

[0022] The above technical solution can improve the structural stability of the second plate, thereby effectively improving the reliability of the bearing part.

[0023] In some embodiments of the first aspect, the first plate is one of DP590 steel, DP780 steel, DP1180 steel, or DP980 steel. The second plate is one of DC56 steel, DC53 steel, or DC52 steel.

[0024] The above technical solution, by setting the first plate and the second plate as steel plates, can facilitate the first plate and the second plate to be connected by welding, which is simple to operate, has high reliability, and is conducive to reducing costs.

[0025] In some embodiments of the first aspect, the thickness of the first plate is 1 mm-6 mm, and the tensile strength of the first plate is 350 MPa-3000 MPa.

[0026] By setting the plate thickness and tensile strength of the first plate within the above range, the first plate has both high structural strength to provide support performance and the thickness can be flexibly adjusted according to the specific application environment to take into account lightweight requirements.

[0027] In some embodiments of the first aspect, the thickness of the second plate is 0.5 mm-4.5 mm, and the tensile strength of the second plate is 100 MPa-700 MPa.

[0028] By setting the thickness and tensile strength of the second plate within the above range, it is helpful to reduce the design difficulty and cost of the second plate, thereby improving the overall economic benefits of the battery device. In addition, the thickness of the second plate can be flexibly adjusted according to the specific application environment to take into account the lightweight requirements.

[0029] In some embodiments of the first aspect, the toughness of the first plate is 10 J / cm²-70 J / cm², and the toughness of the second plate is 60 J / cm²-300 J / cm².

[0030] The above technical solution helps to reduce the design difficulty and cost of the first plate by setting the toughness of the first plate within the above range, thereby improving the overall economic benefits of the battery device. By setting the toughness of the second plate within the above range, the second plate can have a better deformation energy absorption capability while reducing the cost of the second plate.

[0031] In some embodiments of the first aspect, the battery device further comprises a mounting sleeve, which is connected to the bearing portion. A first through hole is provided on the first plate, the first through hole penetrates the first plate along the thickness direction of the first plate, a second through hole is provided on the second plate, the second through hole penetrates the second plate along the thickness direction of the second plate, and the mounting sleeve is passed through the first through hole and the second through hole.

[0032] The above technical solution facilitates the assembly connection between the battery device and the electrical device by introducing the mounting sleeve, thereby improving the usability of the battery device. When the mounting sleeve is subjected to an external force, the external force can be directly transmitted to the first plate and the second plate, so that the first plate and the second plate can directly give corresponding feedback to it, thereby improving the reliability of the battery device. In addition, the connection stability of the mounting sleeve can also be improved.

[0033] In a second aspect, the present application provides an electrical device, comprising a battery device provided by any embodiment of the first aspect, and the battery device is used to store or provide electrical energy.

[0034] 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

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0037] Figure 2 A schematic diagram of a three-dimensional structure of a battery cell of a battery device provided in some embodiments of the present application;

[0038] Figure 3 A schematic diagram of the three-dimensional structure of a box of a battery device provided in some embodiments of the present application;

[0039] Figure 4 A schematic diagram of a top view of a box of a battery device provided in some embodiments of the present application;

[0040] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along AA.

[0041] The reference numerals in the specific implementation manner are as follows:

[0042] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor;

[0043] 10. Battery cells;

[0044] 20, box body; 21, frame; 22, bearing part; 221, first plate; 2211, first main body; 2212, first connecting part; 2213, second connecting part; 222, second plate; 2221, second main body; 2222, third connecting part; 2223, fourth connecting part; 223, cavity; 23, accommodating space; 24, bottom plate;

[0045] 30. Mounting sleeve;

[0046] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application 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 drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0049] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0052] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0053] The term “plurality” used in this application refers to two or more (including two).

[0054] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0055] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0056] The battery device mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0057] In some embodiments, the battery device may be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0058] In some embodiments, the battery device may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0059] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0060] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0061] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0062] In the development of battery technology, the reliability of battery devices will directly affect the reliability, cost of use and user experience of terminal products. When the battery device is hit or squeezed, the frame of the battery device needs to withstand a large force, so a high-strength load-bearing part is usually set on the frame to connect the mounting parts. However, if the strength of the load-bearing part is too high, when the battery device is hit or squeezed, too much energy will be transferred to the battery cell, which may easily cause leakage, fire or explosion of the battery cell, seriously affecting the reliability of the battery device.

[0063] Based on the above considerations, an embodiment of the present application provides a battery device, which includes a battery cell and a box body, the box body includes a frame, a bottom plate and a bearing portion, the frame and the bottom plate enclose a storage space, and the battery cell is arranged in the storage space. The bearing portion is located outside the frame and connected to the frame, the bearing portion includes a first plate and a second plate, the first plate and the second plate are connected, the structural strength of the first plate is greater than the structural strength of the second plate, and the toughness of the second plate is greater than the toughness of the first plate.

[0064] The above technical solution uses a first plate with high structural strength and a second plate with high toughness to form a bearing part. When the battery device is hit and squeezed, the first plate can provide strong support performance, and the second plate can deform and absorb energy. In this way, through the cooperation of the first plate and the second plate, not only can the bearing part have a higher bearing performance, but also the energy transferred to the battery cell can be reduced to reduce the risk of damage to the battery cell, thereby effectively improving the reliability of the battery device.

[0065] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0066] Electrical devices may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0067] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including battery boxes and electrical devices using battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0068] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0069] Continue to refer Figure 1 The vehicle 1 is provided with a battery device 2 inside, and the battery device 2 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 2 can be used for powering the vehicle 1, for example, the battery device 2 can be used as an operating power source for the vehicle 1.

[0070] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery device 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating and driving the vehicle 1 .

[0071] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0072] Figure 2 This is a schematic diagram of a three-dimensional structure of a battery cell of a battery device provided in some embodiments of the present application. Figure 3 This is a schematic diagram of the three-dimensional structure of a box of a battery device provided in some embodiments of the present application. Figure 4 This is a schematic diagram of a top view of a box of a battery device provided in some embodiments of the present application. Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along AA.

[0073] refer to Figures 2 to 5The embodiment of the present application provides a battery device, which includes a battery cell 10 and a box 20. The box 20 includes a frame 21, a bottom plate 24 and a bearing portion 22. The frame 21 and the bottom plate 24 enclose a receiving space 23, and the battery cell 10 is arranged in the receiving space 23. The bearing portion 22 is located outside the frame 21 and connected to the frame 21. The bearing portion 22 includes a first plate 221 and a second plate 222. The first plate 221 and the second plate 222 are connected. The structural strength of the first plate 221 is greater than the structural strength of the second plate 222. The toughness of the second plate 222 is greater than the toughness of the first plate 221.

[0074] In the battery device, the box 20 is used to accommodate the battery cell 10. The box 20 can be a variety of structures, such as a cylinder, a cuboid, etc. The battery cell 10 can be one or more. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, multiple battery cells 10 can also be connected in series, in parallel, or in mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 20.

[0075] In some examples, there are multiple battery cells 10 , and the multiple battery cells 10 are first connected in series, in parallel, or in hybrid connection to form a battery module. The multiple battery modules are then connected in series, in parallel, or in hybrid connection to form a whole, and are accommodated in the box 20 .

[0076] The multiple battery cells 10 in the battery module can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 10 in the battery module.

[0077] Exemplarily, the frame 21 may be a rectangular frame 21, a cylindrical frame 21, or other irregular frames 21. Accordingly, the shape of the receiving space 23 matches the shape of the frame 21. If the frame 21 is a rectangular frame 21, then the receiving space 23 is a rectangular parallelepiped. If the frame 21 is a cylindrical frame 21, then the receiving space 23 is a cylinder. The bottom plate 24 is used to carry the battery cell 10.

[0078] Optionally, the frame 21 and the base plate 24 can be made of but not limited to metal or non-metal materials. For example, the metal material can be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy or stainless steel, and the non-metal material can be ceramic, polyethylene, polypropylene, polyvinyl chloride, polyimide or polyamide, etc.

[0079] The bearing part 22 can be detachably connected to the frame 21, or can be integrally provided on the frame 21. The bearing part 22 can be directly connected to the frame 21, or can be restricted on the frame 21 by other components. As an example, the connection method between the bearing part 22 and the frame 21 can be, but is not limited to, bolt connection, welding, riveting, clamping or bonding.

[0080] Optionally, the bearing portion 22 is a beam structure.

[0081] The number of the bearing parts 22 may be, but is not limited to, one or more. As an example, when the number of the bearing parts 22 is plural, the bearing parts 22 are arranged at intervals.

[0082] The first plate 221 may be detachably connected to the second plate 222, or may be integrally provided on the second plate 222. The first plate 221 may be directly connected to the second plate 222, or may be restricted to the second plate 222 by other components. As an example, the connection method between the first plate 221 and the second plate 222 may be, but is not limited to, bolt connection, welding, riveting, clamping or bonding.

[0083] Optionally, the first plate 221 and the second plate 222 may be made of, but are not limited to, metal or non-metal materials. For example, the metal material may be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy or stainless steel, and the non-metal material may be ceramic, polyethylene, polypropylene, polyvinyl chloride, polyimide or polyamide, etc.

[0084] In some examples, the first plate 221 and the second plate 222 are made of the same material, which can simplify the manufacturing process and reduce costs.

[0085] Structural strength refers to the ability of materials and structures to resist fracture, excessive deformation and damage. The greater the structural strength, the stronger the ability of materials and structures to resist fracture, excessive deformation and damage; the smaller the structural strength, the weaker the ability of materials and structures to resist fracture, excessive deformation and damage. In the embodiments of the present application, structural strength refers to at least one of tensile strength, compressive strength, flexural strength, yield strength and shear strength.

[0086] Exemplarily, the strength of the first plate 221 and the second plate 222 can be measured by a tensile test, a bending test, a compression test, an impact test, or a shear test. As an example, in an impact test, the sample is impacted with a pendulum or a drop weight to measure its absorbed energy and toughness. Common tests include the Charpy impact test and the Einstein impact test. As another example, in a tensile test, the tensile strength of the material is measured by applying a tensile force. The specific steps of other test methods can be referred to the methods in the existing technical literature and will not be repeated here.

[0087] Toughness refers to the ability of materials and structures to absorb energy during plastic deformation and fracture. The greater the toughness, the stronger the ability of materials and structures to absorb energy during plastic deformation and fracture; the smaller the toughness, the weaker the ability of materials and structures to absorb energy during plastic deformation and fracture.

[0088] Exemplarily, the toughness of the first plate 221 and the second plate 222 can be measured by impact test, tensile test, fracture toughness test or dynamic mechanical analysis. As an example, in an impact test, a notched specimen is impacted by a pendulum, and the energy absorbed when the specimen breaks is measured, thereby calculating the toughness of the material. As another example, in a tensile test, the material is stretched until it breaks, and its stress-strain curve is measured, thereby calculating the toughness. The specific steps and processes of other testing methods can be referred to the methods in the existing technical literature, and will not be repeated here.

[0089] In some examples, the first plate 221 and the second plate 222 may be made of different materials. For example, the first plate 221 and the second plate 222 have the same structural form, that is, the thickness or structural shape of the first plate 221 and the second plate 222 are the same, and the strength properties of the material of the first plate 221 itself are greater than the strength properties of the material of the second plate 222 itself, so that the structural strength of the first plate 221 is greater than the structural strength of the second plate 222, and the toughness of the second plate 222 is greater than the toughness of the first plate 221.

[0090] In other examples, the first plate 221 and the second plate 222 are made of the same material, and the structural strength of the first plate 221 is greater than the structural strength of the second plate 222, and the toughness of the second plate 222 is greater than the toughness of the first plate 221 by differentially setting the structures of the first plate 221 and the second plate 222, for example, by differentially setting the thicknesses of the first plate 221 and the second plate 222, or by providing different reinforcements on the first plate 221 and the second plate 222.

[0091] The above technical solution uses a first plate 221 with high structural strength and a second plate 222 with high toughness to form the bearing part 22. When the battery device is collided and squeezed, the first plate 221 can provide strong support performance, and the second plate 222 can deform and absorb energy. In this way, through the cooperation of the first plate 221 and the second plate 222, not only can the bearing part 22 have a higher bearing performance, but also can reduce the energy transmitted to the battery cell 10, so as to reduce the risk of damage to the battery cell 10, thereby effectively improving the reliability of the battery device.

[0092] In some embodiments, a cavity 223 is provided between the first plate 221 and the second plate 222 .

[0093] In some examples, the first plate 221 is bent and surrounds a cavity 223 , and the second plate 222 is disposed in the cavity 223 and connected to the first plate 221 .

[0094] In some other examples, the second plate 222 is bent and encloses a cavity 223 , and the first plate 221 is disposed in the cavity 223 and connected to the second plate 222 .

[0095] In some other examples, at least one of the first plate 221 and the second plate 222 is bent, and the first plate 221 and the second plate 222 are connected to form a cavity 223 .

[0096] The above technical solution introduces the cavity 223 between the first plate 221 and the second plate 222. On the one hand, the cavity 223 provides an energy absorption space for the bearing portion 22, which can further reduce the energy transferred to the battery cell 10 when the battery device is collided and squeezed; on the other hand, the cavity 223 can also provide space for the deformation of the second plate 222 when the battery device is collided and squeezed, thereby improving the deformation energy absorption effect of the second plate 222. In short, the reliability of the battery device can be further improved.

[0097] In some embodiments, one end of the first plate 221 along the first direction X is connected to the frame 21, one end of the second plate 222 along the first direction X is connected to the frame 21, and the other end of the first plate 221 along the first direction X is connected to the other end of the second plate 222 along the first direction X. The first plate 221 and the second plate 222 are disposed opposite to each other along the second direction Y, and the first direction X intersects with the second direction Y.

[0098] Exemplarily, the first direction X may be understood as a direction perpendicular to the thickness direction of the first plate 221, and the first direction X may be understood as a direction perpendicular to the thickness direction of the second plate 222. The second direction Y may be understood as a direction parallel to the thickness direction of the first plate 221, and the second direction Y may be understood as a direction parallel to the thickness direction of the second plate 222.

[0099] In some examples, the frame 21 includes a first beam and a second beam disposed opposite to each other along a first direction X, and a third beam and a fourth beam disposed opposite to each other along a third direction Z. The first beam and the second beam extend along the third direction Z, and the third beam and the fourth beam extend along the first direction X. The bearing portion 22 is connected to the first beam. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0100] In some examples, the bearing portion 22 is connected to one side of the first beam along the first direction X, the first plate 221 and the second plate 222 are arranged opposite to each other along the second direction Y, and the bearing portion 22 is extended along the third direction Z.

[0101] In the above technical solution, when the battery device is hit or squeezed, both the first plate 221 and the second plate 222 can better realize their functions, so as to further improve the reliability of the battery device.

[0102] In some embodiments, the first direction X is perpendicular to the second direction Y.

[0103] In some embodiments, the first plate 221 includes a first main body 2211, a first connecting portion 2212, and a second connecting portion 2213, wherein the first connecting portion 2212 and the second connecting portion 2213 are respectively connected to two ends of the first main body 2211 along the first direction X and extend along the second direction Y. The first connecting portion 2212 is attached to and connected to the frame 21, and the second connecting portion 2213 is connected to the second plate 222.

[0104] The first connection portion 2212 may be detachably connected to the first main body portion 2211, or may be integrally provided on the first main body portion 2211. The first connection portion 2212 may be directly connected to the first main body portion 2211, or may be restricted on the first main body portion 2211 by other components. As an example, the connection method between the first connection portion 2212 and the first main body portion 2211 may be, but is not limited to, bolt connection, welding, riveting, clamping or bonding.

[0105] The second connection portion 2213 may be detachably connected to the first main body portion 2211, or may be integrally provided on the first main body portion 2211. The second connection portion 2213 may be directly connected to the first main body portion 2211, or may be restricted to the first main body portion 2211 by other components. As an example, the connection method between the second connection portion 2213 and the first main body portion 2211 may be, but is not limited to, bolt connection, welding, riveting, clamping or bonding.

[0106] In some examples, the first main body 2211, the first connection part 2212, and the second connection part 2213 are an integrally formed structure. On the one hand, there is no need to connect the first main body 2211, the first connection part 2212, and the second connection part 2213 through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the first main body 2211, the first connection part 2212, and the second connection part 2213 through an additional connection process, the first main body 2211, the first connection part 2212, and the second connection part 2213 in an integral structure have a higher connection firmness.

[0107] The first connection portion 2212 is fitted with the frame 21 , which means that the extension direction of the first connection portion 2212 is parallel to the plane where the side wall of the frame 21 is located, so that there is surface contact between the first connection portion 2212 and the frame 21 .

[0108] In some examples, the first direction X may be parallel to a horizontal plane, and the second direction Y may be perpendicular to the horizontal plane.

[0109] For example, the first connection part 2212 and the frame 21 may be connected by, but not limited to, welding, bolting, or riveting. The second connection part 2213 and the second plate 222 may be connected by, but not limited to, welding, bolting, or riveting.

[0110] The above technical solution can increase the contact area between the first plate 221 and the frame 21 to improve the connection firmness between the first plate 221 and the frame 21, thereby further improving the reliability of the battery device.

[0111] In some embodiments, an extending direction of the first connection portion 2212 is opposite to an extending direction of the second connection portion 2213 .

[0112] Exemplarily, the extension direction of the first connection portion 2212 is opposite to the extension direction of the second connection portion 2213 , so that the entire first plate 221 can form a Z-shaped structure, and the Z-shaped structure has better structural stability.

[0113] The above technical solution can improve the structural stability of the first plate 221 , thereby effectively improving the reliability of the bearing portion 22 .

[0114] In some embodiments, the second plate 222 includes a second main body portion 2221, a third connection portion 2222, and a fourth connection portion 2223, wherein the third connection portion 2222 and the fourth connection portion 2223 are respectively connected to two ends of the second main body portion 2221 along the first direction X and extend along the second direction Y. The third connection portion 2222 is attached to and connected to the frame 21, and the fourth connection portion 2223 is connected to the second connection portion 2213.

[0115] The third connection part 2222 can be detachably connected to the second main body part 2221, or can be integrally provided on the second main body part 2221. The third connection part 2222 can be directly connected to the second main body part 2221, or can be restricted on the second main body part 2221 by other components. As an example, the connection method between the third connection part 2222 and the second main body part 2221 can be, but is not limited to, bolt connection, welding, riveting, clamping or bonding, etc.

[0116] The fourth connection portion 2223 may be detachably connected to the second main body portion 2221, or may be integrally provided on the second main body portion 2221. The fourth connection portion 2223 may be directly connected to the second main body portion 2221, or may be restricted on the second main body portion 2221 by other components. As an example, the connection method between the fourth connection portion 2223 and the second main body portion 2221 may be, but is not limited to, bolt connection, welding, riveting, clamping or bonding.

[0117] In some examples, the second main body 2221, the third connection part 2222 and the fourth connection part 2223 are an integrally formed structure. On the one hand, there is no need to connect the second main body 2221, the third connection part 2222 and the fourth connection part 2223 through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the second main body 2221, the third connection part 2222 and the fourth connection part 2223 through an additional connection process, the second main body 2221, the third connection part 2222 and the fourth connection part 2223 in an integral structure have a higher connection firmness.

[0118] The third connection portion 2222 is fitted with the frame 21 , which means that the extension direction of the third connection portion 2222 is parallel to the plane where the side wall of the frame 21 is located, so that the third connection portion 2222 and the frame 21 are in surface contact.

[0119] For example, the third connection part 2222 and the frame 21 may be connected by, but not limited to, welding, bolting, or riveting. The fourth connection part 2223 and the second plate 222 may be connected by, but not limited to, welding, bolting, or riveting.

[0120] The above technical solution can increase the contact area between the second plate 222 and the frame 21 to improve the connection firmness between the second plate 222 and the frame 21, thereby further improving the reliability of the battery device.

[0121] In some embodiments, the fourth connection portion 2223 is attached to and connected to the second connection portion 2213 , and the fourth connection portion 2223 and the second connection portion 2213 at least partially overlap in the first direction X.

[0122] Exemplarily, the fourth connection part 2223 is fitted with the second connection part 2213, which means that the extension direction of the fourth connection part 2223 is parallel to the plane where the second connection part 2213 is located, so that the fourth connection part 2223 is in surface contact with the second connection part 2213. The fourth connection part 2223 and the second connection part 2213 can be but are not limited to welding, bolting or riveting.

[0123] The fourth connection portion 2223 and the second connection portion 2213 at least partially overlap in the first direction X. It can be understood that the entire fourth connection portion 2223 and the entire second connection portion 2213 overlap in the first direction X, or a portion of the fourth connection portion 2223 and a portion of the second connection portion 2213 overlap in the first direction X.

[0124] The above technical solution can increase the contact area between the first plate 221 and the second plate 222 to improve the connection firmness between the first plate 221 and the second plate 222 , thereby effectively improving the reliability of the bearing portion 22 .

[0125] In some embodiments, the fourth connection portion 2223 is attached to and connected to a side of the second connection portion 2213 facing the cavity 223 .

[0126] Exemplarily, the fourth connection portion 2223 is located in the cavity 223. It is understandable that the structural strength of the second connection portion 2213 is greater than that of the fourth connection portion 2223, and the ability of the second connection portion 2213 to resist external impact is better than that of the fourth connection portion 2223 to resist external impact.

[0127] In this way, when the battery device is collided and squeezed, the second connection part 2213 can protect the fourth connection part 2223, reducing the risk of failure of the supporting part 22 due to breakage of the fourth connection part 2223, thereby further improving the reliability of the battery device.

[0128] In some embodiments, an extending direction of the third connection portion 2222 is opposite to an extending direction of the fourth connection portion 2223 .

[0129] Exemplarily, the extension direction of the third connection portion 2222 is opposite to the extension direction of the fourth connection portion 2223 , so that the entire second plate 222 can form a Z-shaped structure, and the Z-shaped structure has better structural stability.

[0130] The above technical solution can improve the structural stability of the second plate 222 , thereby effectively improving the reliability of the bearing portion 22 .

[0131] In some embodiments, the first plate 221 includes at least one of DP590 steel, DP780 steel, DP1180 steel, or DP980 steel. The second plate 222 includes at least one of DC56 steel, DC53 steel, or DC52 steel.

[0132] Exemplarily, DP and DC in the above technical solution refer to the classification of steel, and DP590, DP780, DP1180, DP980, DC56, DC53 and DC52 are all grades of steel.

[0133] DP steel can also be called dual-phase steel. DP steel is a high-strength steel mainly composed of ferrite and martensite. The number after DP is used to indicate the tensile strength of the steel. For example, the tensile strength of DP590 steel is 590MPa, the tensile strength of DP780 steel is 780MPa, the tensile strength of DP1180 steel is 1180MPa, and the tensile strength of DP980 steel is 980MPa.

[0134] DC steel can also be called deep drawing steel or stretching steel. DC steel is a high-toughness steel. The carbon content of DC steel is usually low to have good toughness. The number after DP is usually used to indicate the toughness of the steel. The larger the number, the better the toughness. For example, the toughness of DC56 steel is greater than that of DC53 steel, which is greater than that of DC52 steel.

[0135] The above technical solution, by setting the first plate 221 and the second plate 222 as steel plates, can facilitate the first plate 221 and the second plate 222 to be connected by welding, which is simple to operate, has high reliability, and is conducive to reducing costs.

[0136] In some embodiments, the first plate 221 is a steel plate, and the second plate 222 is an aluminum alloy plate.

[0137] In some embodiments, the first plate 221 and the second plate 222 are both aluminum alloy plates.

[0138] In some embodiments, the first plate 221 is an aluminum alloy plate, and the second plate 222 is a steel plate.

[0139] In some embodiments, the first plate 221 is a titanium alloy plate, and the second plate 222 is an aluminum alloy plate.

[0140] It should be noted that the specific materials of the first plate 221 and the second plate 222 can have a variety of combinations and can be selected according to the actual application environment, as long as the structural strength of the first plate 221 is greater than the structural strength of the second plate 222, and the toughness of the second plate 222 is greater than the toughness of the first plate 221.

[0141] In some embodiments, the thickness of the first plate 221 is 1 mm-6 mm, and the tensile strength of the first plate 221 is 350 MPa-3000 MPa.

[0142] Illustratively, the thickness of the first plate 221 may be, but is not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc.

[0143] The tensile strength of the first plate 221 may be, but is not limited to, 350 MPa, 400 MPa, 450 MPa, 500 MPa, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1000 MPa, 1500 MPa, 2000 MPa, 2500 MPa, 3000 MPa, etc.

[0144] By setting the plate thickness and tensile strength of the first plate 221 within the above range, the first plate 221 has both high structural strength to provide support performance and the thickness can be flexibly adjusted according to the specific application environment to take into account the lightweight requirements.

[0145] Furthermore, the thickness of the first plate 221 is 1.8 mm-3.5 mm, and the tensile strength of the first plate 221 is 590 MPa-2000 MPa, so as to further improve the balance between the supporting performance and lightweight of the first plate 221 and improve the economy of the first plate 221.

[0146] Exemplarily, the thickness of the first plate 221 may be, but is not limited to, 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, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc.

[0147] The tensile strength of the first plate 221 may be, but is not limited to, 590 MPa, 600 MPa, 650 MPa, 750 MPa, 850 MPa, 950 MPa, 1000 MPa, 1100 MPa, 1200 MPa, 1300 MPa, 1400 MPa, 1500 MPa, 1600 MPa, 1700 MPa, 1800 MPa, 1900 MPa, 2000 MPa, etc.

[0148] In some embodiments, the thickness of the second plate 222 is 0.5 mm-4.5 mm, and the tensile strength of the second plate 222 is 100 MPa-700 MPa.

[0149] Exemplarily, the thickness of the second plate 222 may be, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, etc.

[0150] The tensile strength of the second plate 222 may be, but is not limited to, 100 MPa, 200 MPa, 300 MPa, 400 MPa, 500 MPa, 600 MPa, 700 MPa, etc.

[0151] It can be understood that the main function of the second plate 222 is to deform and absorb energy when the battery device is hit or squeezed, and the second plate 222 does not need to have a very high tensile strength.

[0152] By setting the thickness and tensile strength of the second plate 222 within the above range, it is helpful to reduce the design difficulty and cost of the second plate 222, thereby improving the overall economic benefits of the battery device. In addition, the thickness of the second plate 222 can be flexibly adjusted according to the specific application environment to take into account the lightweight requirements.

[0153] Furthermore, the thickness of the second plate 222 is 1.5 mm-2.5 mm, and the tensile strength of the second plate 222 is 200 MPa-590 MPa, so as to further reduce the design difficulty and cost of the second plate 222 .

[0154] Illustratively, the thickness of the second plate 222 may be, but is not limited to, 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, etc.

[0155] The tensile strength of the second plate 222 may be, but is not limited to, 200 MPa, 250 MPa, 300 MPa, 350 MPa, 400 MPa, 450 MPa, 500 MPa, 5500 MPa, 590 MPa, etc.

[0156] In some embodiments, the toughness of the first plate 221 is 10 J / cm²-70 J / cm², and the elongation after fracture of the first plate 221 is 5%-40%.

[0157] For example, the above-mentioned unit of joule per square centimeter can be understood as the energy absorbed by the first plate 221 per square centimeter when it is deformed and broken under impact load. The elongation after fracture is also an important indicator for judging the toughness of a material or structure. The elongation after fracture is the percentage of the elongated length of a material or structure when it is broken by an external force to the original length. The larger the elongation after fracture, the better the toughness of the material or structure.

[0158] As an example, the toughness of the first plate 221 may be, but is not limited to, 10 J / cm², 20 J / cm², 30 J / cm², 40 J / cm², 50 J / cm², 60 J / cm², 70 J / cm², etc. The elongation after fracture of the first plate 221 may be, but is not limited to, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, etc.

[0159] It can be understood that the main function of the first plate 221 is to provide strong support performance when the battery device is collided and squeezed, and the first plate 221 does not need to have too high toughness.

[0160] By setting the toughness of the first plate 221 within the above range, it is helpful to reduce the design difficulty and cost of the first plate 221, thereby improving the overall economic benefits of the battery device.

[0161] Furthermore, the toughness of the first plate 221 is 20 J / cm²-40 J / cm², and the elongation after fracture of the first plate 221 is 10%-25%, so as to reduce the design difficulty and cost of the first plate 221.

[0162] As an example, the toughness of the first plate 221 may be, but is not limited to, 20 J / cm², 25 J / cm², 30 J / cm², 35 J / cm², 40 J / cm, etc. The elongation after fracture of the first plate 221 may be, but is not limited to, 20%, 22%, 24%, 26%, 2%, 30%, 32%, 34%, 36%, 38%, 40%, etc.

[0163] In some embodiments, the toughness of the second plate 222 is 60 J / cm²-300 J / cm², and the elongation after fracture of the second plate 222 is 15%-50%.

[0164] Exemplarily, the toughness of the second plate 222 may be, but is not limited to, 60 J / cm², 100 J / cm², 150 J / cm², 200 J / cm², 250 J / cm², 300 J / cm², etc.

[0165] The elongation after fracture of the second plate 222 may be, but is not limited to, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc.

[0166] By setting the toughness and elongation after fracture of the second plate 222 within the above range, the second plate 222 can have a better deformation energy absorption capability while reducing the cost of the second plate 222 .

[0167] Furthermore, the toughness of the second plate 222 is 80 J / cm²-150 J / cm², and the elongation after fracture of the second plate 222 is 25%-35%, which can further improve the deformation energy absorption capability of the second plate 222 and the cost-effectiveness.

[0168] In some embodiments, the battery device further includes a mounting sleeve 30 , and the mounting sleeve 30 is connected to the carrying portion 22 .

[0169] Exemplarily, the mounting sleeve 30 is used to achieve a reliable connection between the battery device and the power-consuming device, wherein the power-consuming device may be, but is not limited to, a vehicle.

[0170] The mounting sleeve 30 can be detachably connected to the load-bearing portion 22, or can be integrally provided on the load-bearing portion 22. The mounting sleeve 30 can be directly connected to the load-bearing portion 22, or can be restricted on the load-bearing portion 22 by other components. As an example, the mounting sleeve 30 and the load-bearing portion 22 can be connected by, but not limited to, bolt connection, welding, riveting, clamping or bonding.

[0171] Optionally, the mounting sleeve 30 may be but is not limited to being made of metal or non-metallic materials. For example, the metal material may be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy or stainless steel, etc., and the non-metallic material may be ceramic, polyethylene, polypropylene, polyvinyl chloride, polyimide or polyamide, etc.

[0172] The above technical solution introduces the mounting sleeve 30 to facilitate the assembly connection between the battery device and the electrical device, thereby improving the usability of the battery device.

[0173] In some embodiments, a first through hole is opened on the first plate 221, and the first through hole passes through the first plate 221 along the thickness direction of the first plate 221. A second through hole is opened on the second plate 222, and the second through hole passes through the second plate 222 along the thickness direction of the second plate 222. The mounting sleeve 30 is passed through the first through hole and the second through hole.

[0174] For example, the projection shape of the first through hole along the thickness direction of the first plate 221 may be, but not limited to, circular, elliptical, rectangular, or trapezoidal, etc. The projection shape of the second through hole along the thickness direction of the second plate 222 may be, but not limited to, circular, elliptical, rectangular, or trapezoidal, etc.

[0175] In some examples, the first plate 221 and the second plate 222 are arranged in parallel, and the first through hole and the second through hole at least partially overlap in a direction perpendicular to the plane where the first plate 221 and the second plate 222 are located, which helps to reduce the difficulty of assembling the mounting sleeve 30.

[0176] In some examples, the first plate 221 and the second plate 222 are arranged in parallel, and the first through hole and the second through hole overlap in a direction perpendicular to the plane where the first plate 221 and the second plate 222 are located, which helps to further reduce the difficulty of assembling the mounting sleeve 30.

[0177] When the mounting sleeve 30 of the above technical solution is subjected to an external force, the external force can be directly transmitted to the first plate 221 and the second plate 222, so that the first plate 221 and the second plate 222 can directly make corresponding feedback to it, thereby improving the reliability of the battery device. In addition, the connection stability of the mounting sleeve 30 can also be improved.

[0178] According to some embodiments of the present application, the present application also provides an electrical device, including a battery device according to any of the above schemes, and the battery device is used to store or provide electrical energy.

[0179] If not otherwise specified, all implementations and optional implementations of the present application can be combined with each other to form a new technical solution. All technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0180] In order to better understand the battery device provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned battery device in practical application is provided here for illustration.

[0181] The embodiment of the present application provides a battery device, which includes a battery cell 10 and a box 20. The box 20 includes a frame 21, a bottom plate 24 and a bearing portion 22. The frame 21 and the bottom plate 24 enclose a receiving space 23, and the battery cell 10 is arranged in the receiving space 23. The bearing portion 22 is located outside the frame 21 and connected to the frame 21. The bearing portion 22 includes a first plate 221 and a second plate 222. The first plate 221 and the second plate 222 are connected and enclose a cavity 223. The first plate 221 includes high-strength steel, and the second plate 222 includes high-toughness steel. The structural strength of the first plate 221 is greater than the structural strength of the second plate 222, and the toughness of the second plate 222 is greater than the toughness of the first plate 221.

[0182] The first plate 221 includes a first main body 2211, a first connecting portion 2212 and a second connecting portion 2213. The first connecting portion 2212 and the second connecting portion 2213 are respectively connected to both ends of the first main body 2211 along the first direction X and are extended along the second direction Y. The extension direction of the first connecting portion 2212 is opposite to the extension direction of the second connecting portion 2213. The first connecting portion 2212 is attached to and connected to the frame 21. The first plate 221 and the second plate 222 are arranged opposite to each other along the second direction Y. The first direction X is parallel to the horizontal plane, and the second direction Y is perpendicular to the horizontal plane.

[0183] The second plate 222 includes a second main body portion 2221, a third connection portion 2222, and a fourth connection portion 2223. The third connection portion 2222 and the fourth connection portion 2223 are respectively connected to two ends of the second main body portion 2221 along the first direction X and are extended along the second direction Y. The extension direction of the third connection portion 2222 is opposite to the extension direction of the fourth connection portion 2223. The third connection portion 2222 is attached to and connected with the frame 21, and the fourth connection portion 2223 is attached to and connected with a side of the second connection portion 2213 facing the cavity 223. The fourth connection portion 2223 and the second connection portion 2213 at least partially overlap in the first direction X.

[0184] The above technical solution uses a first plate 221 with high structural strength and a second plate 222 with high toughness to form the bearing part 22. When the battery device is collided and squeezed, the first plate 221 can provide strong support performance, and the second plate 222 can deform and absorb energy. In this way, through the cooperation of the first plate 221 and the second plate 222, not only can the bearing part 22 have a higher bearing performance, but also can reduce the energy transmitted to the battery cell 10, so as to reduce the risk of damage to the battery cell 10, thereby effectively improving the reliability of the battery device.

[0185] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 battery device, It is characterized in that include: Battery cells; The box body includes a frame, a bottom plate and a bearing part, the frame and the bottom plate enclose a storage space, the battery cell is arranged in the storage space, the bearing part is located on the outside of the frame and connected to the frame, the bearing part includes a first plate and a second plate, the first plate and the second plate are connected, the structural strength of the first plate is greater than the structural strength of the second plate, and the toughness of the second plate is greater than the toughness of the first plate.

2. The battery device according to claim 1, It is characterized in that A cavity is defined between the first plate and the second plate.

3. The battery device according to claim 2, It is characterized in that One end of the first plate along the first direction is connected to the frame, one end of the second plate along the first direction is connected to the frame, and the other end of the first plate along the first direction is connected to the other end of the second plate along the first direction; The first plate and the second plate are arranged opposite to each other along a second direction, and the first direction intersects with the second direction.

4. The battery device according to claim 3, It is characterized in that The first plate includes a first main body, a first connecting portion and a second connecting portion, wherein the first connecting portion and the second connecting portion are respectively connected to two ends of the first main body along the first direction and extend along the second direction; The first connection portion is attached to and connected to the frame, and the second connection portion is connected to the second plate.

5. The battery device according to claim 4, It is characterized in that An extending direction of the first connecting portion is opposite to an extending direction of the second connecting portion.

6. The battery device according to claim 4, It is characterized in that The second plate includes a second main body portion, a third connecting portion and a fourth connecting portion, wherein the third connecting portion and the fourth connecting portion are respectively connected to two ends of the second main body portion along the first direction and extend along the second direction; The third connection portion is attached to and connected to the frame, and the fourth connection portion is connected to the second connection portion.

7. The battery device according to claim 6, It is characterized in that The fourth connection portion is attached to and connected to the second connection portion, and the fourth connection portion and the second connection portion at least partially overlap in the first direction.

8. The battery device according to claim 7, It is characterized in that The fourth connection portion is attached to and connected to a side of the second connection portion facing the cavity.

9. The battery device according to claim 6, It is characterized in that An extending direction of the third connection portion is opposite to an extending direction of the fourth connection portion.

10. The battery device according to claim 1, It is characterized in that The first plate is one of DP590 steel, DP780 steel, DP1180 steel or DP980 steel; The second plate is one of DC56 steel, DC53 steel or DC52 steel.

11. The battery device according to claim 1, It is characterized in that The thickness of the first plate is 1 mm-6 mm, and the tensile strength of the first plate is 350 MPa-3000 MPa.

12. The battery device according to claim 1, It is characterized in that The thickness of the second plate is 0.5 mm-4.5 mm, and the tensile strength of the second plate is 100 MPa-700 MPa.

13. The battery device according to claim 1, It is characterized in that The toughness of the first plate is 10J / cm²-70J / cm², and the toughness of the second plate is 60J / cm²-300J / cm².

14. The battery device according to any one of claims 1 to 13, It is characterized in that The battery device further comprises a mounting sleeve, wherein the mounting sleeve is connected to the carrying portion; A first through hole is provided on the first plate, and the first through hole penetrates the first plate along the thickness direction of the first plate. A second through hole is provided on the second plate, and the second through hole penetrates the second plate along the thickness direction of the second plate. The mounting sleeve is inserted into the first through hole and the second through hole.

15. An electrical device, It is characterized in that The invention comprises a battery device as described in any one of claims 1 to 14, wherein the battery device is used to store or provide electrical energy.

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