Battery device, battery box body and power utilization device

Abstract

The embodiment of the utility model discloses a battery device, a battery box body and a power utilization device. The battery device comprises a battery monomer and a box body, the box body accommodates a battery monomer and comprises a bottom wall and a side wall, the bottom wall comprises a main body part and a flange part, the side wall comprises a connecting part, the flange part is provided with a connecting hole, the connecting part is provided with a mounting hole, and the connecting hole and the mounting hole are connected through a fastener so as to connect the bottom wall and the side wall; the bottom wall comprises a first composite material layer and a second composite material layer which are arranged in a stacked mode and further comprises a metal layer, and the metal layer is located between the first composite material layer and the second composite material layer. Wherein the edges of the first composite material layer and the second composite material layer both exceed the edge of the metal layer, and the edge of the metal layer exceeds the edge of the connecting hole, so that the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device, a battery housing, and an electrical device. Background Technology

[0002] Currently, the bottom and side walls of battery devices are often connected by flanges. However, due to the weak structural strength of the flange connection, when the battery device is subjected to a side impact or long-term use, the flange connection area may be damaged or twisted, resulting in sealing failure and reduced reliability of the battery device.

[0003] Therefore, improving the reliability of battery devices has become an urgent problem to be solved. Utility Model Content

[0004] This application provides a battery device, a battery housing, and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, a battery device is provided, including a battery cell and a housing. The housing houses the battery cell and includes a bottom wall and side walls. The bottom wall includes a main body and a flange, and the side walls include a connecting portion. The flange has a connecting hole, and the connecting portion has a mounting hole. The connecting hole and the mounting hole are connected by fasteners to connect the bottom wall and the side walls. The bottom wall includes a first composite material layer and a second composite material layer stacked together, and the bottom wall also includes a metal layer located between the first composite material layer and the second composite material layer. Projected along a direction perpendicular to the surface with the largest surface area of ​​the bottom wall, the edges of both the first and second composite material layers extend beyond the edge of the metal layer, and the edge of the metal layer extends beyond the edge of the connecting hole.

[0006] In the technical solution provided in this application embodiment, the bottom wall and side wall of the housing are connected to the mounting holes provided on the side wall through the connection holes provided on the bottom wall. The bottom wall includes a first composite material layer, a metal layer and a second composite material layer stacked together. The first composite material layer and the second composite material layer can protect the metal layer from scratches from the inside and outside of the battery device. The edge of the metal layer extends beyond the connection hole, which can effectively protect the flange connection area when the battery device is subjected to side impact or long-term use, thereby improving the reliability of the battery device.

[0007] In some embodiments, the flange portion is closer to the sidewall than the body portion, along the direction perpendicular to the surface with the largest bottom wall surface area.

[0008] In the technical solution provided in this application embodiment, the flange portion is closer to the side wall along the direction perpendicular to the surface with the largest bottom wall area, which can provide a clearance area for the fasteners. After the housing is assembled, the fasteners will not be exposed, thereby reducing the possibility of collision damage to the fasteners of the battery device and thus improving the reliability of the battery device.

[0009] In some embodiments, the tensile strength of the metal layer is greater than the tensile strength of the first composite material layer and the tensile strength of the second composite material layer.

[0010] In the technical solution provided in this application embodiment, the tensile strength of the metal layer is greater than the tensile strength of the first composite material layer and the tensile strength of the second composite material layer. In the event of a side impact of the battery device, the metal layer can better maintain the connection strength between the connection hole and the fastener, thereby improving the reliability of the battery device.

[0011] In some embodiments, the first composite material layer includes a first through hole, the metal layer includes a second through hole, and the second composite material layer includes a third through hole, with the first through hole, the second through hole, and the third through hole being disposed correspondingly to form a connecting hole.

[0012] In the technical solution provided in this application embodiment, the first composite material layer includes a first through hole, the metal layer includes a second through hole, and the second composite material layer includes a third through hole. The fastener passes through the through holes of the first composite material layer, the metal layer, and the second composite material layer. On the one hand, the fastener can play a role in pressing and fixing the first composite material layer, the metal layer, and the second composite material layer. On the other hand, the areas of the first composite material layer, the metal layer, and the second composite material layer without through holes can be effectively protected, thereby improving the reliability of the battery device.

[0013] In some embodiments, the edge of the second through hole, projected along a direction perpendicular to the surface with the largest bottom wall area, extends beyond the edges of the first and third through holes.

[0014] In the technical solution provided in this application embodiment, the edge of the second through hole, projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall, exceeds the edges of the first and third through holes. When assembling fasteners, a certain tolerance is left between the through holes provided in the first composite material layer, the metal layer, and the second composite material layer, which can reduce the possibility of the connection hole left after the combination of the first composite material layer, the metal layer, and the second composite material layer jamming the fastener, thereby improving the reliability of the battery device.

[0015] In some embodiments, the edge of the second through hole, projected along the direction perpendicular to the surface with the largest bottom wall area, exceeds the edge dimension d1 of the first through hole and / or the third through hole, satisfying: 0 < d1 ≤ 5 mm.

[0016] In the technical solution provided in this application embodiment, the edge of the second through hole along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall exceeds the edge dimension d1 of the first through hole and / or the third through hole, which satisfies: 0 < d1 ≤ 5 mm. On the one hand, the second through hole reserves a certain assembly tolerance, which can reduce the possibility of fastener jamming during assembly. On the other hand, the size of the second through hole exceeding the first and third through holes is not too large, thereby enhancing the rigidity of the flange and thus improving the reliability of the battery device.

[0017] In some embodiments, the edge of the second via extends to the edge of the metal layer.

[0018] In the technical solution provided in this application embodiment, the edge of the second through hole extends to the edge of the metal layer, thereby forming a semi-open through hole. On the one hand, the semi-open through hole is easier to process, and on the other hand, the semi-open through hole can reserve a larger assembly tolerance, which can improve the assembly success rate and thus improve the reliability of the battery device.

[0019] In some embodiments, a protective frame is provided on the outer side of the metal layer along a first direction, the first direction being parallel to the metal layer. The protective frame is provided with a first extension extending toward the center of the metal layer, the first extension being at least partially accommodated within a second through hole. The first extension is provided with a fourth through hole, the fourth through hole being correspondingly provided with the first through hole and the third through hole to form a connection hole.

[0020] In the technical solution provided in this application embodiment, a protective frame is provided on the outer side of the metal layer along the first direction. The protective frame can reduce the possibility of the metal layer directly contacting the air and can reduce the damage that occurs when the battery device is side-impacted. The first extension of the protective frame extends into the second through hole, which can further reduce the possibility of the metal layer directly contacting the air, thereby improving the reliability of the battery device.

[0021] In some embodiments, a protective frame is provided on the outer side of the metal layer along a first direction, the first direction being parallel to the metal layer.

[0022] In the technical solution provided in this application embodiment, a protective frame is provided on the outer side of the metal layer along the first direction. The protective frame can reduce the possibility of the metal layer directly contacting the air and can reduce the damage that occurs when the battery device is side-impacted, thereby improving the reliability of the battery device.

[0023] In some embodiments, the battery device further includes: a threaded sleeve that passes through a mounting hole, and a first groove is provided on the surface of the threaded sleeve facing the bottom wall; wherein the inner wall of the first groove is provided with a threaded groove for engaging with a fastener.

[0024] In some embodiments, the diameter of the portion of the fastener located within the mounting hole is greater than the diameter of the portion of the fastener located within the first groove.

[0025] In the technical solution provided in this application embodiment, the diameter of the part of the fastener located in the connecting hole is larger than the diameter of the part of the fastener located in the first groove, thereby forming a stepped structure. After the fastener is screwed in, the stepped structure can support the bottom wall and side wall on the one hand, and on the other hand, the stepped structure of the fastener is a rigid structure. When the battery device is subjected to vibration and impact, the fastener between the softer first composite material layer and the second composite material layer can maintain rigidity, thereby reducing the possibility of the fastener falling off and twisting, thereby improving the reliability of the battery device.

[0026] In some embodiments, the fastener includes a nut located on the side of the bottom wall away from the sidewall, and a sealing gasket is provided between the nut and the bottom wall.

[0027] In the technical solution provided in this application embodiment, a sealing gasket is provided between the nut of the fastener and the bottom wall. The sealing gasket can be pressed against the bottom wall to seal the connection hole, thereby reducing the probability of moisture in the air entering the connection hole and thus reducing the probability of metal layer corrosion, thereby improving the reliability of the battery device.

[0028] In some embodiments, the dimension W1 by which the edge of the first composite material layer and / or the second composite material layer extends beyond the edge of the metal layer satisfies: 0 < W1 ≤ 5 mm.

[0029] In the technical solution provided in this application embodiment, the dimension W1 by which the edge of the first composite material layer and / or the second composite material layer exceeds the edge of the metal layer satisfies: 0 < W1 ≤ 5 mm. Within this range, on the one hand, the first composite material layer and / or the second composite material layer can provide the metal layer with a certain degree of impact and scratch resistance, and the coating of the metal layer by the first composite material layer and / or the second composite material layer can reduce the possibility of the metal layer being corroded by moisture. On the other hand, the dimension of W1 is not too large, thereby reducing the size of the bottom wall and thus increasing the energy density of the battery device.

[0030] Secondly, a battery housing is provided, comprising: a bottom wall and a side wall, the bottom wall including a main body and a flange, the side wall including a connecting part, the flange having a connecting hole, the connecting part having a mounting hole, the connecting hole and the mounting hole being connected to connect the bottom wall and the side wall; the bottom wall including a first composite material layer and a second composite material layer stacked together, the bottom wall also including a metal layer, the metal layer being located between the first composite material layer and the second composite material layer; wherein, when projected along a direction perpendicular to the surface with the largest surface area of ​​the bottom wall, the edges of the first composite material layer and the second composite material layer both extend beyond the edge of the metal layer, and the edge of the metal layer extends beyond the edge of the connecting hole.

[0031] Thirdly, an electrical device is provided, comprising a battery device as described in any of the first aspects, the battery device being used to provide electrical energy. In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft. Attached Figure Description

[0032] Figure 1 A schematic diagram of the structure of a vehicle according to one embodiment of this application is shown;

[0033] Figure 2 A partial structural schematic diagram of the battery device according to an embodiment of this application is shown;

[0034] Figure 3 A top view schematic diagram of a battery device provided in one embodiment of this application is shown;

[0035] Figure 4 An exploded view of the bottom wall of a battery device according to a certain embodiment of this application is shown;

[0036] Figure 5 This application shows Figure 3 A schematic diagram of the AA cross-section of the battery device in the diagram;

[0037] Figure 6 This application shows Figure 5 Detailed drawing of Part A of the battery device;

[0038] Figure 7 A top view of the bottom wall portion of a battery device according to a certain embodiment of this application is shown;

[0039] Figure 8 It shows Figure 7 Detailed drawing of Part B of the battery device;

[0040] Figure 9 A top view of another possible bottom wall portion of the battery device provided in one embodiment of this application is shown;

[0041] Figure 10 It shows Figure 9 Detailed drawing of part C of the battery device;

[0042] Figure 11 An exploded schematic diagram of the bottom wall of a battery device provided in another embodiment of this application is shown;

[0043] Figure 12 It shows Figure 11 Detailed view of part D of the battery device;

[0044] Figure 13 This application shows Figure 5 Another possible detailed view of part A of the provided battery device;

[0045] Figure 14 A schematic diagram of a fastener provided in one embodiment of this application is shown;

[0046] Figure 15 This application shows Figure 7 Another possible detailed drawing of section B of the battery device.

[0047] Figure label:

[0048] 1-Vehicle; 10-Battery unit; 11-Box; 111-First box section; 112-Second box section; 20-Battery cell; 200-Battery cell assembly; 30-Controller; 40-Motor; 300-Bottom wall; 400-Side wall; 310-Main body; 320-Flange; 410-Connecting part; 321-First composite material layer; 322-Metal layer; 323-Second composite material layer; 330-Connecting hole; 331-First through hole; 332-Second through hole; 333-Third through hole; 411-Mounting hole; 324-Protective frame; 3241-First extension; 3242-Fourth through hole; 500-Fastener; 510-Nut; 520-Sealing gasket; 600-Threaded sleeve; 610-First groove. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0051] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0055] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0056] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0057] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0058] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0059] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0060] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0061] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0062] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0063] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0064] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0065] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0066] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0067] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0068] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0069] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0070] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0071] Currently, the bottom and side walls of battery devices are often connected by flanges. However, due to the weak structural strength of the flange connection, when the battery device is subjected to a side impact or long-term use, the flange connection area may be damaged or twisted, resulting in sealing failure and reduced reliability of the battery device.

[0072] Therefore, improving the reliability of battery devices has become an urgent problem to be solved.

[0073] This application provides a battery device, including a battery cell and a housing. The housing houses the battery cell and includes a bottom wall and side walls. The bottom wall includes a main body and a flange, and the side walls include a connecting portion. The flange has a connecting hole, and the connecting portion has a mounting hole. The connecting hole connects with the mounting hole to connect the bottom wall and the side walls. The bottom wall includes a first composite material layer and a second composite material layer stacked together, and the bottom wall also includes a metal layer located between the first composite material layer and the second composite material layer. Projected along a direction perpendicular to the surface with the largest surface area of ​​the bottom wall, the edges of both the first and second composite material layers extend beyond the edge of the metal layer, and the edge of the metal layer extends beyond the edge of the connecting hole.

[0074] In the technical solution provided in this application embodiment, the bottom wall and side wall of the housing are connected by a flange and a connecting part. The flange of the bottom wall includes a first composite material layer, a metal layer and a second composite material layer stacked together. The first composite material layer and the second composite material layer can protect the metal layer from scratches from the inside and outside of the battery device, so that the flange connection area can be effectively protected when the battery device is subjected to side impact or long-term use, thereby improving the reliability of the battery device.

[0075] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0076] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0077] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0078] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0079] For example, Figure 2 A partial structural schematic diagram of the battery device 10 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The prism shape shown, or it could be different. Figure 2 Other shapes are shown, but the embodiments of this application are not limited to these.

[0080] It should be understood that, such as Figure 2As shown, the battery device 10 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 20. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 20 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 20 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as... Figure 2 As shown, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0081] For example, unlike Figure 2 As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0082] The following is combined Figures 3 to 6 This application describes a battery device 10 provided in one embodiment.

[0083] Figure 3 A top view schematic diagram of a battery device 10 provided in a certain embodiment of this application is shown; Figure 4 An exploded view of the bottom wall 300 of a battery device 10 according to a certain embodiment of this application is shown; Figure 5 This application shows Figure 3 A schematic cross-sectional view of the battery device 10 in the diagram; Figure 6 This application shows Figure 5 Detailed view of part A of the battery device 10.

[0084] This application provides a battery device 10, including a battery cell 20 and a housing 11. The housing 11 houses the battery cell 20 and includes a bottom wall 300 and a side wall 400. The bottom wall 300 includes a main body portion 310 and a flange portion 320, and the side wall 400 includes a connecting portion 410. The flange portion 320 is provided with a connecting hole 330, and the connecting portion 410 is provided with a mounting hole 411. The connecting hole 330 and the mounting hole 411 are connected by a fastener 500 to connect the bottom wall 300 and the side wall 400. The bottom wall 300 includes a first composite material layer 321 and a second composite material layer 323 stacked together. The bottom wall 300 also includes a metal layer 322 located between the first composite material layer 321 and the second composite material layer 323. Projected along a direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, the edges of the first composite material layer 321 and the second composite material layer 323 both extend beyond the edge of the metal layer 322, and the edge of the metal layer 322 extends beyond the edge of the connecting hole 330.

[0085] The flange portion 320 can be an area for flange connection. The flange portion 320 can be provided with a connection hole 330, through which a fastener 500 can pass to fix the bottom wall 300 and the side wall 400. The embodiments of this application are not limited thereto.

[0086] Fastener 500 can be a bolt or other components with fastening functions, and the embodiments of this application are not limited thereto.

[0087] The connection hole 330 and the mounting hole 411 are connected to connect the bottom wall 300 and the side wall 400. The connection hole 330 and the mounting hole 411 can be engaged with the fastener 500 to fix the bottom wall 300 and the side wall 400.

[0088] For example, the main material of metal layer 322 can be metal, such as iron. Materials with iron as the main material can be steel, titanium alloys, or other hard alloys.

[0089] In some embodiments, the main material of the metal layer 322 may also be other materials with high tensile strength, such as ceramics, high-strength plastics, etc.

[0090] The main materials of the first composite material layer 321 and the second composite material layer 323 can be composite materials, such as fiber composites, such as carbon fiber, aramid fiber, glass fiber, etc.

[0091] During the use of the battery device 10, the battery device 10 may be subjected to side impacts. The flange connection area of ​​the battery device 10 is located on the side of the battery device 10. When the structural strength of the flange connection area is insufficient, the side impact may cause the fasteners 500 to twist, loosen or even fall off, thereby affecting the reliability of the battery device 10.

[0092] In this embodiment, the edge of the projection of the metal layer 322 extends beyond the edge of the connection hole 330. The structure at the connection hole 330 has greater strength. When the battery device 10 is subjected to a side impact, the metal layer 322 can maintain the shape of the connection hole 330, thereby reducing the possibility of twisting problems.

[0093] The projected edges of the first composite material layer 321 and the second composite material layer 323 extend beyond the edge of the metal layer 322. On the one hand, this reduces the possibility of corrosion of the cross section of the metal layer 322. On the other hand, it protects the metal layer 322 from scratches from inside and outside the battery device 10.

[0094] In the technical solution provided in this application embodiment, the bottom wall 300 and side wall 400 of the housing 11 are connected to the mounting hole 411 of the side wall 400 through the connection hole 330 of the bottom wall 300. The bottom wall 300 includes a first composite material layer 321, a metal layer 322 and a second composite material layer 323 stacked together. The first composite material layer 321 and the second composite material layer 323 can protect the metal layer 322 from scratches from the inside and outside of the battery device 10. The edge of the metal layer 322 extends beyond the connection hole 330, which can effectively protect the flange connection area when the battery device 10 is subjected to side impact or long-term use, thereby improving the reliability of the battery device 10.

[0095] The thicknesses of the first composite material layer 321, the metal layer 322, and the second composite material layer 323 are not limited in this embodiment. For example, the first composite material layer 321 can be thinner and the second composite material layer 323 can be thicker, thereby enabling the second composite material layer 323 to better absorb scrapes and vibrations in the direction close to the ground. The thicknesses of the first composite material layer 321, the metal layer 322, and the second composite material layer 323 can be from 0 to 3 mm, and this embodiment is not limited thereto.

[0096] A transition membrane can be provided between the first composite material layer 321 and the metal layer 322, and between the metal layer 322 and the second composite material layer 323 to increase the interfacial bonding force. The transition membrane can be a resin membrane, and the thickness of the resin membrane can be between 0 and 0.5 mm.

[0097] In some possible embodiments, the flange portion 320 is closer to the sidewall 400 than the main body portion 310, along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300.

[0098] The flange portion 320 is closer to the side wall 400 along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300. This can be understood as the bottom wall 300 partially protruding towards the side wall 400 along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300.

[0099] The flange portion 320 is closer to the side wall 400 along a direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, which can form a clearance area at the bottom of the battery device 10, so that the top of the fastener 500 for flange connection can be accommodated in the clearance area.

[0100] Since the flange portion 320 is closer to the side wall 400 along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, the bottom wall 300 needs to be bent at the connection between the flange portion 320 and the main body portion 310. Due to the different tensile strengths of the first composite material layer 321, the second composite material layer 323, and the metal layer 322, the bent portion at the connection can be processed by the following steps: firstly, the edge of the metal layer 322 is bent out, and then the first composite material layer 321 and the second composite material layer 323 are formed together with the metal layer 322 in the mold. In this way, the metal layer 322 can protect the flange connection area.

[0101] In the technical solution provided in this application embodiment, the flange portion 320 is closer to the side wall 400 along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, which can provide a clearance area for the fastener 500. After the housing 11 is assembled, the fastener 500 will not be exposed, thereby reducing the possibility of collision damage to the fastener 500 of the battery device 10, thereby improving the reliability of the battery device 10.

[0102] In some embodiments, the tensile strength of the metal layer 322 is greater than the tensile strength of the first composite material layer 321 and the tensile strength of the second composite material layer 323.

[0103] Tensile strength refers to the maximum force a metallic material can withstand during the tensile process, from the yield stage to the strengthening stage, until it breaks, divided by the original cross-sectional area of ​​the specimen. Tensile strength testing can refer to standard GB / T 228-2002, but this application does not limit the specific testing methods.

[0104] The metal layer 322 has greater tensile strength and can withstand stronger stress. In the event of a side impact to the battery device 10, the metal layer 322 can better maintain its shape, thereby maintaining the torque of the fastener 500.

[0105] In the technical solution provided in this application embodiment, the tensile strength of the metal layer 322 is greater than the tensile strength of the first composite material layer 321 and the tensile strength of the second composite material layer 323. In the event of a side impact of the battery device 10, the metal layer 322 can better maintain the connection strength between the connection hole 330 and the fastener 500, thereby improving the reliability of the battery device 10.

[0106] The connecting hole 330 and the mounting hole 411 can be formed by multiple through holes in a multi-layer structure, and this application embodiment does not limit this.

[0107] The connecting hole 330 and the mounting hole 411 can be directly used for the fastener 500 to pass through. A nut or other type of fastener can be provided on one side of the connecting hole 330 and the mounting hole 411 to fix the bottom wall 300 and the side wall 400. The connecting hole 330 and the mounting hole 411 can also have threads on their inner walls, thereby fixing the fastener 500 through the threads. The connecting hole 330 and the mounting hole 411 can also be provided with a threaded sleeve, which passes through the connecting hole 330 and / or the mounting hole 411, thereby fixing the fastener 500 through the threads within the threaded sleeve. This embodiment is not limited to these methods.

[0108] The following is for reference. Figure 6 And further reading Figures 7 to 10 This application describes a battery device 10 provided in one embodiment.

[0109] Figure 7 A top view of the bottom wall 300 portion of a battery device 10 provided in one embodiment of this application is shown; Figure 8 It shows Figure 7 Detailed view of part B of the battery device 10; Figure 9 A top view of another possible bottom wall 300 portion of the battery device 10 provided in one embodiment of this application is shown; Figure 10 It shows Figure 9 Detailed drawing of part C of the battery device 10.

[0110] In some possible embodiments, the first composite material layer 321 includes a first through hole 331, the metal layer 322 includes a second through hole 332, and the second composite material layer 323 includes a third through hole 333. The first through hole 331, the second through hole 332, and the third through hole 333 are correspondingly arranged to form a connecting hole 330.

[0111] The first composite material layer 321, the metal layer 322, and the second composite material layer 323 of the flange portion 320 are respectively provided with through holes, so that the fastener 500 can pass through the first composite material layer 321, the metal layer 322, and the second composite material layer 323, and protect the areas where no through holes are provided.

[0112] In the technical solution provided in this application embodiment, the first composite material layer 321 includes a first through hole 331, the metal layer 322 includes a second through hole 332, and the second composite material layer 323 includes a third through hole 333. The fastener 500 passes through the through holes of the first composite material layer 321, the metal layer 322, and the second composite material layer 323. On the one hand, the fastener 500 can play a role in pressing and fixing the first composite material layer 321, the metal layer 322, and the second composite material layer 323. On the other hand, the areas of the first composite material layer 321, the metal layer 322, and the second composite material layer 323 without through holes can be effectively protected, thereby improving the reliability of the battery device 10.

[0113] In some possible embodiments, for example Figure 9 and Figure 10 The edge of the second through hole 332, projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, extends beyond the edges of the first through hole 331 and the third through hole 333.

[0114] The edge of the second through hole 332, projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, exceeds the first through hole 331 and the third through hole 333. The second through hole 332 is larger in size. When the metal layer 322 is processed separately, a certain assembly error can be left when the metal layer 322 and the first composite material layer 321 are assembled with the second composite material layer 323, so that the fastener 500 can pass smoothly.

[0115] In the technical solution provided in this application embodiment, the edge of the second through hole 332, projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, exceeds the edges of the first through hole 331 and the third through hole 333. When assembling the fastener 500, a certain tolerance is left between the through holes provided in the first composite material layer 321, the metal layer 322, and the second composite material layer 323. This can reduce the possibility that the connection hole 330 left after the first composite material layer 321, the metal layer 322, and the second composite material layer 323 are stuck in the fastener 500, thereby improving the reliability of the battery device 10.

[0116] In some possible embodiments, the edge of the second through hole 332, projected along a direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300, exceeds the edge dimension d1 of the first through hole 331 and / or the third through hole 333, satisfying: 0 < d1 ≤ 5 mm.

[0117] In the technical solution provided in this application embodiment, the edge of the second through hole 332 projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300 exceeds the edge dimension d1 of the first through hole 331 and / or the third through hole 333, which satisfies: 0 < d1 ≤ 5 mm. On the one hand, the second through hole 332 reserves a certain assembly tolerance, which can reduce the possibility of the fastener 500 getting stuck during assembly. On the other hand, the size of the second through hole 332 exceeding the first through hole 331 and the third through hole 333 is not too large, thereby enhancing the rigidity of the flange 320 and thus improving the reliability of the battery device 10.

[0118] Furthermore, the edge of the second through hole 332 projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300 can exceed the edge dimension d1 of the first through hole 331 and / or the third through hole 333, which can satisfy: 1mm≤d1≤4mm. If d1 is within this range, the second through hole 332 has sufficient assembly tolerance and can further improve the rigidity of the flange 320.

[0119] The edge of the second through hole 332 projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall 300 exceeds the edge of the first through hole 331 and / or the third through hole 333. The dimension d1 can also take other values. For example, d1 can take any of the following values ​​or any value between any two of them: 0.25mm, 0.5mm, 0.75mm, 1.0mm, 1.25mm, 1.5mm, 1.75mm, 2.0mm, 2.25mm, 2.5mm, 2.75mm, 3.0mm, 3.25mm, 3.5mm, 3.75mm, 4.0mm, 4.25mm, 4.5mm, 4.75mm and 5.0mm.

[0120] In some possible embodiments, the edge of the second via 332 extends to the edge of the metal layer 322.

[0121] The edge of the second through hole 332 extends to the edge of the metal layer 322, that is, the edge of the second through hole 332 is connected to or shares the edge of the metal layer 322. For example, the second through hole 332 is a U-shaped hole as shown in the figure. This application embodiment is not limited to this.

[0122] In the technical solution provided in this application embodiment, the edge of the second through hole 332 extends to the edge of the metal layer 322, thereby forming a semi-open through hole. On the one hand, the semi-open through hole is easier to process, and on the other hand, the semi-open through hole can reserve a larger assembly tolerance, which can improve the assembly success rate and thus improve the reliability of the battery device 10.

[0123] The following is combined Figure 11 and Figure 12 This application describes a battery device 10 provided in another embodiment.

[0124] Figure 11 An exploded view of the bottom wall 300 of the battery device 10 provided in another embodiment of this application is shown; Figure 12 It shows Figure 11 Detailed view of part D of the battery device 10.

[0125] In some possible embodiments, a protective frame 324 is provided on the outer side of the metal layer 322 along a first direction, the first direction being parallel to the metal layer 322.

[0126] The protective frame 324 can be a frame with a certain anti-collision capability. For example, the main material of the protective frame 324 can be a plastic material. For example, the base material of the protective frame 324 is resin. The resin can be thermosetting resin or thermoplastic resin. The embodiments of this application are not limited thereto.

[0127] The outer side of the metal layer 322 along the first direction can be understood as the periphery of the metal layer 322. The periphery of the metal layer 322 is provided with a protective frame 324, which can reduce the possibility that the periphery of the metal layer 322 is directly exposed to the air, and can protect the flange portion 320 of the bottom wall 300 when the battery device 10 is involved in a side collision.

[0128] In the technical solution provided in this application embodiment, a protective frame 324 is provided on the outer side of the metal layer 322 along the first direction. The protective frame 324 can reduce the possibility of the metal layer 322 directly contacting the air and can reduce the damage that occurs when the battery device 10 is side-impacted, thereby improving the reliability of the battery device 10.

[0129] In some possible embodiments, a protective frame 324 is provided on the outer side of the metal layer 322 along a first direction parallel to the metal layer 322. The protective frame 324 is provided with a first extension 3241 extending toward the center of the metal layer 322. The first extension 3241 is at least partially accommodated in the second through hole 332. The first extension 3241 is provided with a fourth through hole 3242, which is provided corresponding to the first through hole 331 and the third through hole 333 to form a connecting hole 330.

[0130] Furthermore, the first extension 3241 of the protective frame 324 extends into the second through hole 332 and is used as a through hole for the fastener 500 through the fourth through hole 3242. In this way, when the connecting hole 330 passes through the fastener 500, the cross-section of the metal layer 322 will not be directly exposed, thereby reducing the possibility of corrosion of the metal layer 322.

[0131] The protective frame 324 may not extend into the second through hole 332. For example, the second through hole 332 may be a round hole. In this case, the protective frame 324 may only be provided on the periphery of the metal layer 322.

[0132] In the technical solution provided in this application embodiment, a protective frame 324 is provided on the outer side of the metal layer 322 along the first direction. The protective frame 324 can reduce the possibility of the metal layer 322 directly contacting the air and can reduce the damage that occurs when the battery device 10 is bumped from the side. The first extension 3241 of the protective frame 324 extends into the second through hole 332, which can further reduce the possibility of the metal layer 322 directly contacting the air, thereby improving the reliability of the battery device 10.

[0133] The following is combined Figure 13 and Figure 14 This application describes a battery device 10 provided in one embodiment.

[0134] Figure 13 This application shows Figure 5 Another possible detailed view of part A of the provided battery device 10; Figure 14 A schematic diagram of a fastener 500 provided in one embodiment of this application is shown.

[0135] In some possible embodiments, the second flange connection 410 includes a threaded sleeve 600 that passes through the mounting hole 411, and a first groove 610 is provided on the surface of the threaded sleeve 600 facing the bottom wall 300; wherein the inner wall of the first groove 610 is provided with a threaded groove for engaging with the fastener 500.

[0136] A first groove 610 is provided on the surface of the threaded sleeve 600 facing the bottom wall 300. The first groove 610 is provided with a threaded groove, which can cooperate with the fastener 500. After the fastener 500 passes through the connecting hole 330, it can be further screwed into the threaded sleeve 600, thereby realizing the fixed connection between the bottom wall 300 and the side wall 400.

[0137] The threaded sleeve 600 passes through the mounting hole 411, which facilitates the fixing of the fastener 500 to the second flange connection 410. Compared with the fastener 500 passing directly through the mounting hole 411, the threaded sleeve 600 and the fastener 500 have a higher connection strength, which can improve the connection strength between the bottom wall 300 and the side wall 400, thereby improving the reliability of the battery device 10.

[0138] In some possible embodiments, the diameter of the portion of the fastener 500 located within the connection hole 330 is larger than the diameter of the portion of the fastener 500 located within the first groove 610.

[0139] The diameter of the portion of the fastener 500 located in the connecting hole 330 is larger than the diameter of the portion of the fastener 500 located in the first groove 610. The fastener 500 forms a stepped structure at the connection interface between the bottom wall 300 and the side wall 400. After the fastener 500 is tightened, the stepped structure can abut against the interface between the bottom wall 300 and the side wall 400, effectively supporting the bottom wall 300 and the side wall 400.

[0140] The first composite material layer 321 and the second composite material layer 323 have low tensile strength. When the flange connection is subjected to vibration and impact, the flange connection may loosen, which may lead to the problem of fastener 500 falling off.

[0141] The stepped structure can also absorb stress. During the use of the battery device 10, even if the flange connection is subjected to vibration and impact, the stepped structure can form a rigid connection, and the softer first composite material layer 321 and second composite material layer 323 are not prone to loosening.

[0142] In the technical solution provided in this application embodiment, the diameter of the portion of the fastener 500 located in the connecting hole 330 is larger than the diameter of the portion of the fastener 500 located in the first groove 610, thereby forming a stepped structure. After the fastener 500 is screwed in, the stepped structure can support the bottom wall 300 and the side wall 400 on the one hand, and on the other hand, the stepped structure of the fastener 500 is a rigid structure. When the battery device 10 is subjected to vibration and impact, the fastener 500 between the softer first composite material layer 321 and the second composite material layer 323 can maintain rigidity, thereby reducing the possibility of the fastener 500 falling off and twisting, thereby improving the reliability of the battery device 10.

[0143] In some possible embodiments, the fastener 500 includes a nut 510 located on the side of the bottom wall 300 away from the side wall 400, and a sealing gasket 520 is provided between the nut 510 and the bottom wall 300.

[0144] The sealing gasket 520 is disposed between the nut 510 of the fastener 500 and the bottom wall 300. The sealing gasket 520 can seal the connection hole 330, thereby reducing the possibility of external moisture and oxygen entering the connection hole 330 and coming into contact with the cross section of the metal layer 322.

[0145] The sealing gasket 520 can be a gasket with certain sealing performance. The material of the sealing gasket 520 is not limited in this application embodiment. For example, the sealing gasket 520 can be a metal gasket, a rubber gasket, a plastic gasket, etc.

[0146] For example, the thickness of the sealing gasket 520 can be 0-3 mm, and the embodiments of this application are not limited thereto.

[0147] Furthermore, the thickness of the sealing gasket 520 can be 0-1mm. Within this range, the sealing gasket 520 can provide sufficient support to improve the rigidity of the flange connection, while also preventing it from being too thick, thus reducing the weight of the battery device 10.

[0148] In the technical solution provided in this application embodiment, a sealing gasket 520 is provided between the nut 510 of the fastener 500 and the bottom wall 300. The sealing gasket 520 can be pressed against the bottom wall 300 to seal the connection hole 330, thereby reducing the probability of moisture in the air entering the connection hole 330, thereby reducing the probability of corrosion of the metal layer 322, and thus improving the reliability of the battery device 10.

[0149] Figure 15 This application shows Figure 7 Another possible detailed view of part B of the battery device 10.

[0150] In some possible embodiments, the edges of the first composite material layer 321 and / or the second composite material layer 323 extend beyond the edge of the metal layer 322.

[0151] The edges of the first composite material layer 321 and / or the second composite material layer 323 extend beyond the edge of the metal layer 322. The first composite material layer 321 and / or the second composite material layer 323 can provide a certain degree of protection for the metal layer 322 and can provide a certain degree of buffering for the metal layer 322 when the battery device 10 is subjected to stress.

[0152] In the technical solution provided in this application embodiment, the edges of the first composite material layer 321 and / or the second composite material layer 323 extend beyond the edge of the metal layer 322. The first composite material layer 321 and / or the second composite material layer 323 cover the edge of the metal layer 322, thereby providing a certain buffer for the metal layer 322 and improving the impact and scratch resistance of the metal layer 322, thereby improving the reliability of the battery device 10.

[0153] In some possible embodiments, the dimension W1 by which the edge of the first composite material layer 321 and / or the second composite material layer 323 extends beyond the edge of the metal layer 322 satisfies: 0 < W1 ≤ 5 mm.

[0154] In the technical solution provided in this application embodiment, the dimension W1 by which the edge of the first composite material layer 321 and / or the second composite material layer 323 exceeds the edge of the metal layer 322 satisfies: 0 < W1 ≤ 5 mm. Within this range, on the one hand, the first composite material layer 321 and / or the second composite material layer 323 can provide the metal layer 322 with a certain degree of impact and scratch resistance, and the covering of the metal layer 322 by the first composite material layer 321 and / or the second composite material layer 323 can reduce the possibility of the metal layer 322 being corroded by moisture. On the other hand, the dimension W1 is not too large, thereby reducing the dimension of the bottom wall 300, and thus increasing the energy density of the battery device 10.

[0155] Furthermore, the dimension W1 by which the edges of the first composite material layer 321 and / or the second composite material layer 323 extend beyond the edge of the metal layer 322 can satisfy: 1mm ≤ W1 ≤ 3mm. Within this range, on the one hand, the first composite material layer 321 and / or the second composite material layer 323 can more effectively prevent scratches; on the other hand, the size of the bottom wall 300 is further reduced, which can improve the energy density of the battery device 10.

[0156] The dimension W1 by which the edge of the first composite material layer 321 and / or the second composite material layer 323 extends beyond the edge of the metal layer 322 can also be other values. For example, W1 can be any of the following values ​​or any two of the following values: 0.25mm, 0.5mm, 0.75mm, 1.0mm, 1.25mm, 1.5mm, 1.75mm, 2.0mm, 2.25mm, 2.5mm, 2.75mm, 3.0mm, 3.25mm, 3.5mm, 3.75mm, 4.0mm, 4.25mm, 4.5mm, 4.75mm, and 5.0mm.

[0157] According to some embodiments of this application, this application also provides an electrical device including the battery device 10 described in any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device.

[0158] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, include: Battery cell (20); A housing (11) is provided to house the battery cell (20). The housing (11) includes a bottom wall (300) and a side wall (400). The bottom wall (300) includes a main body (310) and a flange (320). The side wall (400) includes a connecting part (410). The flange (320) is provided with a connecting hole (330). The connecting part (410) is provided with a mounting hole (411). The connecting hole (330) and the mounting hole (411) are connected by fasteners (500) to connect the bottom wall (300) and the side wall (400). The bottom wall (300) includes a first composite material layer (321) and a second composite material layer (323) stacked together. The bottom wall (300) also includes a metal layer (322) located between the first composite material layer (321) and the second composite material layer (323). Wherein, when projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall (300), the edges of the first composite material layer (321) and the second composite material layer (323) both extend beyond the edge of the metal layer (322), and the edge of the metal layer (322) extends beyond the edge of the connecting hole (330).

2. The battery device according to claim 1, characterized in that, Along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall (300), the flange portion (320) is closer to the side wall (400) than the main body portion (310).

3. The battery device of claim 1, wherein The tensile strength of the metal layer (322) is greater than the tensile strength of the first composite material layer (321) and the tensile strength of the second composite material layer (323).

4. The battery device of claim 1, wherein The first composite material layer (321) includes a first through hole (331), the metal layer (322) includes a second through hole (332), and the second composite material layer (323) includes a third through hole (333). The first through hole (331), the second through hole (332), and the third through hole (333) are respectively arranged to form the connecting hole (330).

5. The battery device according to claim 4, characterized in that, The edge of the second through hole (332) projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall (300) extends beyond the edges of the first through hole (331) and the third through hole (333).

6. The battery device of claim 5, wherein, The edge of the second through hole (332) projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall (300) exceeds the edge dimension d1 of the first through hole (331) and / or the third through hole (333) and satisfies: 0 < d1 ≤ 5 mm.

7. The battery device of claim 5, wherein The edge of the second through hole (332) extends to the edge of the metal layer (322).

8. The battery device of claim 7, wherein, The metal layer (322) is provided with a protective frame (324) on the outer side along a first direction, the first direction being parallel to the metal layer (322). The protective frame (324) is provided with a first extension (3241) extending toward the center of the metal layer (322), the first extension (3241) being at least partially accommodated within the second through hole (332). The first extension (3241) is provided with a fourth through hole (3242), which is provided in correspondence with the first through hole (331) and the third through hole (333) to form the connecting hole (330).

9. The battery device of claim 1, wherein, The metal layer (322) is provided with a protective frame (324) on the outer side along the first direction, which is parallel to the metal layer (322).

10. The battery device of claim 1, wherein The battery device also includes: A threaded sleeve (600) passes through the mounting hole (411), and a first groove (610) is provided on the surface of the threaded sleeve (600) facing the bottom wall (300). The inner wall of the first groove (610) is provided with a threaded groove, which is used to cooperate with the fastener (500).

11. The battery device of claim 10, wherein, The diameter of the portion of the fastener (500) located within the mounting hole (411) is greater than the diameter of the portion of the fastener (500) located within the first groove (610).

12. The battery device of claim 10, wherein, The fastener (500) includes a nut (510) located on the side of the bottom wall (300) away from the side wall (400), and a sealing gasket (520) is provided between the nut (510) and the bottom wall (300).

13. The battery device according to any one of claims 1 to 12, characterized by, The dimension W1 by which the edge of the first composite material layer (321) and / or the second composite material layer (323) extends beyond the edge of the metal layer (322) satisfies: 0 < W1 ≤ 5 mm.

14. A battery pack (11) characterized by include: The bottom wall (300) and the side wall (400) are provided. The bottom wall (300) includes a main body (310) and a flange (320). The side wall (400) includes a connecting part (410). The flange (320) is provided with a connecting hole (330). The connecting part (410) is provided with a mounting hole (411). The connecting hole (330) is connected to the mounting hole (411) to connect the bottom wall (300) and the side wall (400). The bottom wall (300) includes a first composite material layer (321) and a second composite material layer (323) stacked together. The bottom wall (300) also includes a metal layer (322) located between the first composite material layer (321) and the second composite material layer (323). Wherein, when projected along the direction perpendicular to the surface with the largest surface area of ​​the bottom wall (300), the edges of the first composite material layer (321) and the second composite material layer (323) both extend beyond the edge of the metal layer (322), and the edge of the metal layer (322) extends beyond the edge of the connecting hole (330).

15. An electrical device, comprising: The electrical device includes: The battery device according to any one of claims 1 to 13, wherein the battery device is used to provide electrical energy.

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