Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises at least one battery monomer, a box body and a protective part, the box body is used for accommodating the single battery and comprises a bottom for bearing the single battery, a side part connected with the bottom and a fastener which at least partially protrudes out of the bottom and is far away from the surface of one side of the single battery; the protection piece is connected with the box body and is a plate piece; wherein in the thickness direction of the protective part, the fastener is located on one side, close to the geometric center of the bottom, of the protective part, and at least part of the protective part protrudes out of the surface of one side, away from the battery monomers, of the bottom. In this way, the fastener can be protected through the protection piece, so that the stability of box structure connection is improved, and the possibility of battery damage and sealing failure is reduced.

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] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] Battery bottom scraping refers to the phenomenon that the bottom of the battery is damaged due to friction or collision with external objects during use. In addition, battery bottom scraping can also cause damage to the internal structure or conductive path of the battery, thereby reducing battery performance. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one object of the present application is to provide a battery device and an electrical device to reduce the risk of battery damage.

[0005] The embodiment of the first aspect of the present application provides a battery device. The battery device includes at least one battery cell, a box and a protective member; the box is used to accommodate the battery cell, the box includes a bottom for supporting the battery cell and a side connected to the bottom, and at least partially protrudes from the bottom and is provided with a fastener on a side surface away from the battery cell; the bottom guard plate is located on a side of the bottom away from the battery cell and is connected to the bottom through a fastener; the protective member is connected to the box, and the protective member is a plate; wherein, along the thickness direction of the protective member, the fastener is located on a side of the protective member close to the geometric center of the bottom, and the protective member at least partially protrudes from a side surface of the bottom away from the battery cell.

[0006] In the technical solution of the embodiment of the present application, by providing a protective member to protect the fastener, it is beneficial to improve the stability of the box structure connection, reduce the probability of the fastener being damaged by external impact objects, thereby maintaining the fastening effect of the fastener, and reducing the risk of local structural rupture or even physical damage to the battery due to the pulling of the fastener. In addition, by providing a protective member, the fastening pressure of the fastener can be maintained, thereby reducing the possibility of sealing failure.

[0007] In some embodiments, the fastener is partially protruded along the vertical direction on the side of the bottom away from the battery cell; the protective member includes a connecting portion and a main body, the connecting portion is connected to the side, and the main body protrudes toward the side of the bottom away from the battery cell; wherein the protruding height of the main body relative to the side surface of the bottom away from the battery cell is greater than or equal to the protruding height of the fastener relative to the side surface of the bottom away from the battery cell. In this way, the protective effect of the protective member on the fastener can be improved at least in the horizontal direction, thereby maintaining the fastening effect of the fastener, improving the stability of the box structure connection, and reducing the risk of physical damage and sealing failure of the battery.

[0008] In some embodiments, the surface of one side of the main body facing the fastener is parallel to the vertical direction, which is helpful to determine the relative position of the main body and the fastener or the bottom, so as to facilitate positioning and installation, and at the same time, a certain deformation space can be reserved for the deformation of the main body after being hit or scratched, so as to better protect the fastener.

[0009] In some embodiments, the main body includes a first part and a second part; the first part is arranged in the vertical direction; the second part is connected to the first part and is located on a side of the first part away from the connecting part, and the second part is bent relative to the first part toward the side where the fastener is located. The second part is bent relative to the first part toward the side where the fastener is located, and the protective member can protect the fastener at least in the horizontal direction and the vertical direction, thereby realizing multi-directional protection of the fastener by the protective member, further reducing the probability of damage to the fastener caused by external impact objects, thereby maintaining the fastening effect of the fastener and reducing the risk of physical damage and sealing failure of the battery.

[0010] In some embodiments, the second portion is perpendicular to the first portion, and the orthographic projection of the fastener on the bottom is completely within the range of the orthographic projection of the second portion on the bottom. In this way, the protective member can provide multi-directional protection for the fastener and further improve the protection effect, thereby reducing the probability of damage to the fastener due to external impact objects and reducing the possibility of battery damage and sealing failure.

[0011] In some embodiments, the angle formed by the side surface of the second part facing the fastener and the side surface of the first part facing the fastener is greater than 90 degrees and less than 180 degrees. By selecting a suitable angle range, it is helpful to improve the blocking effect of external impact objects to improve the protective effect of the protective member on the fastener, thereby reducing the risk of physical damage to the battery and sealing failure.

[0012] In some embodiments, the angle formed by the side surface of the second part facing the fastener and the side surface of the first part facing the fastener is greater than or equal to 110 degrees and less than or equal to 150 degrees. By selecting a suitable angle range, it is not only conducive to more efficient use of space, but also conducive to improving the blocking effect of external impact objects to improve the protective effect of the protective member on the fastener, thereby reducing the risk of physical damage to the battery and sealing failure.

[0013] In some embodiments, the second part includes at least one structural weakening portion, and the structural weakening portion is configured so that the second part deforms at the location of the structural weakening portion under the action of an external force. By providing the structural weakening portion, the protective member can absorb the collision energy brought by the external impactor through deformation, thereby improving the blocking of the external impactor to improve the protective effect of the protective member on the fastener, and reducing the risk of physical damage to the battery and sealing failure. In addition, the deformation at the location of the structural weakening portion under the action of an external force can increase the degree of wrapping of the protective member on the fastener, thereby achieving multi-directional protection of the fastener by the protective member, and further reducing the probability of damage to the fastener due to external impactors.

[0014] In some embodiments, there are multiple structural weakening parts, and the multiple structural weakening parts are arranged in sequence from the connection between the first part and the second part in the direction away from the first part. In the face of impact forces of different directions and intensities, multiple structural weakening parts can provide better adaptability, and when one of the structural weakening parts fails, the other structural weakening parts still provide protection and are fault-tolerant. In addition, the multiple structural weakening parts are arranged at intervals, which is conducive to guiding the external impact force to be evenly distributed in the protective part, thereby improving the protective part's blocking of external impact objects to improve the protective effect of the protective part on the fastener, and reducing the risk of physical damage and sealing failure of the battery.

[0015] In some embodiments, the second portion includes a first region provided with a structural weakening portion, and a second region not provided with a structural weakening portion, and the minimum thickness of the first region is less than the minimum thickness of the second region. The thickness of the structural weakening portion has a significant impact on the collision energy absorption. By providing a first region with a smaller minimum thickness, it is beneficial for the second portion to deform under an external force to increase the degree of wrapping of the protective member on the fastener, thereby achieving multi-directional protection of the fastener by the protective member, and further reducing the probability of the fastener being damaged by an external impact object.

[0016] In some embodiments, the surface of the second part facing the fastener includes a plurality of spaced protrusions, and a structural weakening portion is formed between any two adjacent protrusions. By forming a structural weakening portion between any two adjacent protrusions, the second part is advantageously deformed under external forces to increase the degree of wrapping of the fastener by the protective member, thereby achieving multi-directional protection of the fastener by the protective member, and further reducing the probability of damage to the fastener caused by external impact objects.

[0017] In some embodiments, the ratio of the protruding height h1 of the main body relative to the side surface of the bottom away from the battery cell to the protruding height h2 of the fastener relative to the side surface of the bottom away from the battery cell satisfies: 1.5≤h1 / h2≤2. Thus, while improving the protective effect of the protective member on the fastener, the space utilization rate can also be improved.

[0018] In some embodiments, the bottom includes a box bottom plate and a bottom guard plate, the bottom guard plate is located on the side of the box bottom plate away from the battery cell, and is connected to the box bottom plate or side by fasteners. By providing a protective member to protect the fastener, it is beneficial to improve the stability of the connection between the bottom guard plate and the box bottom plate, reduce the probability of damage to the fastener due to external impact objects, thereby maintaining the fastening effect of the fastener, and reducing the risk of local structural rupture or even physical damage to the battery due to the pulling of the fastener. In addition, protecting the fastener with a protective member is beneficial to improving the integrity of the fastener during use, facilitating the maintenance and replacement of the bottom guard plate in the later stage, and improving installation flexibility. In addition, by providing a protective member, the fastening pressure of the fastener can be maintained, thereby reducing the possibility of sealing failure.

[0019] In some embodiments, the bottom guard plate includes a first guard portion, a second guard portion, and a transition portion; the first guard portion is located in the central area of ​​the bottom guard plate; the second guard portion is arranged around the periphery of the first guard portion; the transition portion connects the first guard portion and the second guard portion; wherein the second guard portion is offset relative to the first guard portion toward the side where the battery cell is located, the fastener is arranged on the second guard portion, and the fastener is at least partially located on the side surface of the second guard portion away from the battery cell. This is conducive to the first guard portion protecting the bottom plate of the box body while taking into account the protection of the fastener, thereby further improving the stability of the connection between the bottom guard plate and the bottom plate of the box body, and reducing the probability of battery damage and sealing failure.

[0020] In some embodiments, there are multiple fasteners and they are arranged at intervals along the outer periphery of the bottom; wherein there are multiple protective members, multiple protective members are arranged at intervals along the outer periphery of the bottom and are arranged corresponding to the fasteners; or, there is one protective member and it is continuously arranged along the outer periphery of the bottom. In this way, the fasteners arranged at multiple positions on the bottom can be protected in all directions, further reducing the probability of damage to the fasteners due to external impact objects, thereby maintaining the fastening effect of the fasteners and reducing the risk of physical damage and sealing failure of the battery.

[0021] In some embodiments, the protective member and the side of the box body are integrally formed, which can reduce the subsequent processing or assembly process and help improve production efficiency.

[0022] In some embodiments, the protective member is detachably connected to the side of the box body, which is convenient for the maintenance and replacement of the protective member, thereby further improving the protective effect of the protective member on the fastener.

[0023] In some embodiments, the yield strength of the material of the protective member is greater than or equal to 240 MPa. This is conducive to improving the deformation resistance and load-bearing capacity of the protective member, thereby reducing the probability of damage to the fastener due to external impact objects, further improving the protective effect of the protective member on the fastener, and reducing the possibility of battery damage and sealing failure.

[0024] An embodiment of a second aspect of the present application provides an electrical device, which includes the battery device in the above embodiment.

[0025] 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

[0026] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0027] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0028] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0029] Figure 3 This is one of the structural schematic diagrams of the battery device of some embodiments of the present application;

[0030] Figure 4 This is a second structural schematic diagram of a battery device according to some embodiments of the present application;

[0031] Figure 5 This is one of the partial structural schematic diagrams of the battery device of some embodiments of the present application;

[0032] Figure 6 for Figure 5 A partial enlarged view of part A;

[0033] Figure 7 This is a second partial structural schematic diagram of a battery device according to some embodiments of the present application;

[0034] Figure 8 This is a third partial structural diagram of a battery device according to some embodiments of the present application;

[0035] Fig. 9 This is a fourth schematic diagram of a partial structure of a battery device according to some embodiments of the present application;

[0036] Fig.10 This is a fifth partial structural diagram of a battery device according to some embodiments of the present application;

[0037] Fig.11 for Fig.10 A partial enlarged view of part B.

[0038] Description of reference numerals:

[0039] Vehicles 1000;

[0040] Battery device 100, controller 200, motor 300;

[0041] Box body 10, box body first part 11, box body second part 12, bottom 13, box body bottom plate 131, side part 14;

[0042] Battery cell 20, bottom guard plate 30, first protection portion 31, second protection portion 32, transition portion 33, fastener 40, protection member 50, main body 51, first portion 511, second portion 512, connection portion 52, structural weakening portion 53;

[0043] The first direction is X, the second direction is Y, and the third direction is Z. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0053] In some cases, the battery is installed at the bottom of the electric vehicle. During the driving of the electric vehicle, the bottom of the battery may be scratched and damaged due to uneven roads or external particles and foreign objects. This phenomenon will directly cause scratches, dents and other damage to the battery bottom shell. In particular, the fasteners arranged at the bottom of the battery usually partially protrude from the bottom surface, which makes the fasteners more susceptible to external impacts or scratches, resulting in failure of the battery connection and failure of the seal at the bottom of the battery, and may even cause local structural rupture due to the pulling of the fasteners.

[0054] Based on the above considerations, the present application provides a battery device and an electrical device. The battery device includes at least one battery cell, a box and a protective member; the box is used to accommodate the battery cell, and the box includes a bottom for supporting the battery cell and a side connected to the bottom, and a fastener at least partially protruding from the bottom and provided on a side surface away from the battery cell; the protective member is connected to the box, and the protective member is a plate; wherein, along the thickness direction of the protective member, the fastener is located on a side of the protective member close to the geometric center of the bottom, and the protective member at least partially protrudes from the bottom and on a side surface away from the battery cell. In this way, the fastener can be protected by the protective member, thereby improving the stability of the box structure connection and reducing the possibility of battery damage and sealing failure.

[0055] The battery device disclosed in the embodiment of the present application can be used to protect battery cells, which can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device.

[0056] The embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like.

[0057] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0058] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0059] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. Among them, the box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body part 11 and a second box body part 12, and the first box body part 11 and the second box body part 12 cover each other, and the first box body part 11 and the second box body part 12 jointly define a storage space for accommodating the battery cell 20. The second box body part 12 can be a hollow structure with one end open, and the first box body part 11 can be a plate-like structure. The first box body part 11 covers the open side of the second box body part 12, so that the first box body part 11 and the second box body part 12 jointly define a storage space; the first box body part 11 and the second box body part 12 can also be hollow structures with one side open, and the open side of the first box body part 11 covers the open side of the second box body part 12. Of course, the box body 10 formed by the first box body part 11 and the second box body part 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0061] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0062] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0063] Please refer to Figure 3-Figure 5 , Figure 3 This is one of the structural schematic diagrams of the battery device of some embodiments of the present application; Figure 4 This is a second structural schematic diagram of a battery device according to some embodiments of the present application; Figure 5 This is one of the partial structural schematic diagrams of the battery device of some embodiments of the present application.

[0064] The present application embodiment provides a battery device 100, such as Figure 3-Figure 5 As shown, the battery device 100 includes at least one battery cell 20, a box body 10 and a protective member 50; the box body 10 is used to accommodate the battery cell 20, and the box body 10 includes a bottom 13 for supporting the battery cell 20 and a side 14 connected to the bottom 13, and a fastener 40 at least partially protruding from the bottom 13 and provided on a side surface away from the battery cell 20; the protective member 50 is connected to the box body 10, and the protective member 50 is a plate; wherein, along the thickness direction of the protective member 50, the fastener 40 is located on a side of the protective member 50 close to the geometric center of the bottom 13, and the protective member 50 at least partially protrudes from the side surface of the bottom 13 away from the battery cell 20.

[0065] like Figure 3 As shown, the first direction X is the length direction of the box 10, the second direction Y is the width direction of the box 10, and the third direction Z is the height direction of the box 10. In some embodiments, the battery device 100 is installed in a vehicle, and the second direction Y may also be the driving direction of the vehicle.

[0066] The battery cell 20 is the basic unit of the battery. As a separate electrochemical energy storage device, it can convert chemical energy into electrical energy through redox reactions, or convert electrical energy into chemical energy for storage. The battery cell 20 generally consists of a positive electrode that undergoes a reduction reaction during the discharge process, a negative electrode that undergoes an oxidation reaction during the discharge process, an electrolyte that serves as an ion transmission medium, and a diaphragm material that is located between the positive and negative electrodes and can separate the positive and negative electrodes.

[0067] The box 10 is used to provide a storage space for the battery cells 20. The box 10 can adopt a variety of structures, wherein the shape of the box 10 is generally determined according to the arrangement of the battery cells 20 and the usage scenario. In some embodiments, the box 10 is in the shape of a rectangular parallelepiped, which is convenient for installation and layout in various occasions such as vehicles and energy storage equipment. Taking the vehicle 1000 as an example, the rectangular parallelepiped battery box 10 can be placed in the position of the vehicle chassis. The box 10 includes a bottom 13 and a side 14, wherein the bottom 13 is used to bear the weight of the battery cells 20 and the box 10 itself, and the side 14 mainly plays a protective and supporting role to prevent the battery cells 20 from being hit and squeezed from the side.

[0068] The fastener 40 may be a bolt structure or a rivet structure. Taking the bolt structure as an example of the fastener 40, the bolt includes a bolt head and a screw, wherein the bolt head protrudes from the side surface of the bottom 13 away from the battery cell 20. In some cases, the fastener 40 may be used in conjunction with a sealing material to maintain the sealing effect of the battery and prevent external dust, moisture and other harmful substances from entering the box 10.

[0069] The connection between the protective member 50 and the box body 10 can be a fixed connection or a detachable connection. In some embodiments, the protective member 50 is welded to the side 14 of the box body 10, or can be connected to the side 14 of the box body 10 by clamping or bolting. The protective member 50 is a plate, wherein the plate can be understood as having a relatively regular flat plate shape. In some embodiments, the protective member 50 can be a bent plate with a specific angle. Along the thickness direction of the protective member 50, the fastener 40 is located on the side of the protective member 50 close to the geometric center of the bottom 13. It can be understood that in the thickness direction of the protective member 50, that is, in the second direction Y (horizontal direction), the geometric centers of the protective member 50, the fastener 40 and the bottom 13 are arranged in sequence. It should be understood that in some embodiments, the bottom 13 is generally a rectangular parallelepiped structure, and its geometric center is the intersection of the three body diagonals. At the same time, for the bottom 13 with a regular shape, the geometric center of the bottom 13 is also its centroid. In addition, the fastener 40 will have at least a portion protruding from the side surface of the bottom 13 away from the battery cell 20, so that the protective member 50 can block objects or structures that may collide with the fastener 40 in the horizontal direction to protect the fastener 40 at least in the horizontal direction.

[0070] Taking the battery installed on the bottom 13 of an electric vehicle as an example, during the driving of the electric vehicle, the bottom 13 of the battery case 10 and the fastener 40 may be scratched and damaged due to uneven roads or foreign particles. The protective member 50 can protect the fastener 40 and reduce the risk of battery damage.

[0071] By providing a protective member 50 to protect the fastener 40, it is helpful to improve the stability of the box structure connection, reduce the probability of the fastener 40 being damaged by external impact objects such as gravel and external environmental protrusions, thereby maintaining the fastening effect of the fastener 40 and reducing the risk of local structural rupture or even physical damage to the battery due to the pulling of the fastener 40. At the same time, by providing the protective member 50, the fastening pressure of the fastener 40 can be maintained to reduce the possibility of sealing failure. In addition, the protective member 50 is a plate, and along the thickness direction of the protective member 50, the fastener 40 is located on the side of the protective member 50 close to the geometric center of the bottom 13, which is helpful to reduce the space occupied by the protective member 50 in the horizontal direction, thereby improving the space utilization of the battery device 100 to accommodate more battery cells 20.

[0072] Please refer to Figure 6 , Figure 6 for Figure 5 A partial enlarged view of part A.

[0073] According to some embodiments of the present application, Figure 6 As shown, the fastener 40 partially protrudes along the vertical direction on the side of the bottom 13 away from the battery cell 20; the protective member 50 includes a connecting portion 52 and a main body 51, the connecting portion 52 is connected to the side 14, and the main body 51 protrudes toward the side of the bottom 13 away from the battery cell 20; wherein, the protruding height h1 of the main body 51 relative to the surface of the side of the bottom 13 away from the battery cell 20 is greater than or equal to the protruding height h2 of the fastener 40 relative to the surface of the side of the bottom 30 away from the battery cell 20.

[0074] The vertical direction can be a third direction Z, and the fastener 40 is partially protruded along the vertical direction on the side of the bottom 13 away from the battery cell 20. Taking the fastener 40 as an example of a bolt structure, the vertical direction is the direction of the central axis of the bolt. After the fastener 40 realizes a fixed connection with the bottom 13, the head or washer of the bolt will protrude below the bottom 13.

[0075] The protective member 50 includes a connecting portion 52 and a main body 51. The connecting portion 52 and the main body 51 may be integrally formed. The connecting portion 52 and the side portion 14 may be connected by bolts, welding, snap connections, or riveting. The main body 51 protrudes toward the side of the bottom 13 away from the battery cell 20. The main body 51 may be partially protruding or completely protruding from the bottom 13. Figure 6 As shown, the protruding height of the main body 51 relative to the side surface of the bottom 13 away from the battery cell 20 is h1, and the protruding height of the fastener 40 relative to the side surface of the bottom 13 away from the battery cell 20 is h2, wherein h1 and h2 are both height distances in the vertical direction, and h1≥h2. It should be understood that the references of h1 and h2 relative to the bottom 13 are the same reference.

[0076] The protruding height of the main body 51 relative to the side surface of the bottom 13 away from the battery cell 20 is greater than or equal to the protruding height of the fastener 40 relative to the side surface of the bottom 13 away from the battery cell 20. This can improve the protective effect of the protective member 50 on the fastener 40 at least in the horizontal direction, thereby maintaining the fastening effect of the fastener 40, improving the stability of the structural connection of the box body 10, and reducing the risk of physical damage and sealing failure of the battery.

[0077] According to some embodiments of the present application, Figure 5 and Figure 6 As shown, a side surface of the main body portion 51 facing the fastener 40 is parallel to the vertical direction.

[0078] The surface of the main body 51 facing the fastener 40 is parallel to the vertical direction, wherein the vertical direction may be the direction of the central axis of the fastener 40. In some embodiments, the main body 51 may be a plate-like structure, the surface of the main body 51 facing the fastener 40 may be a plane, and the surface of the main body 51 facing away from the fastener 40 may be a plane, a curved surface, or other surface with a groove.

[0079] By setting the side surface of the main body 51 facing the fastener 40 to be vertically parallel, it is helpful to determine the relative position of the main body 51 and the fastener 40 or the bottom 13, thereby facilitating positioning and installation. At the same time, a certain deformation space can be reserved for the deformation of the main body 51 after impact or friction, thereby better protecting the fastener 40.

[0080] Please refer to Figure 7 and Figure 8 , Figure 7 This is the second partial structural diagram of the battery device in some embodiments of the present application. Figure 8 This is the third partial structural diagram of the battery device according to some embodiments of the present application.

[0081] According to some embodiments of the present application, Figure 7 and Figure 8 As shown, the main body 51 includes a first part 511 and a second part 512; the first part 511 is arranged along the vertical direction; the second part 512 is connected to the first part 511 and is located on the side of the first part 511 away from the connecting part 52, and the second part 512 is bent relative to the first part 511 toward the side where the fastener 40 is located.

[0082] The first part 511 is arranged along the vertical direction and the second part 512 is located on the side of the first part 511 away from the connecting part 52. It can be understood that the connecting part 52, the first part 511 and the second part 512 are arranged in sequence along the vertical direction. The second part 512 is connected to the first part 511. In some embodiments, the second part 512 can be integrally formed with the first part 511. The second part 512 is bent relative to the first part 511 toward the side where the fastener 40 is located. It can be understood that the second part 512 has a projection component in the horizontal direction of the first part 511 close to the fastener 40. The vertical direction can be the third direction Z, and the horizontal direction can be the second direction Y.

[0083] The second portion 512 is bent relative to the first portion 511 toward the side where the fastener 40 is located, and the protective member 50 can protect the fastener 40 at least in the horizontal direction and the vertical direction, thereby achieving multi-directional protection of the fastener 40 by the protective member 50, further reducing the probability of damage to the fastener 40 due to external impact objects, thereby maintaining the fastening effect of the fastener 40 and reducing the risk of physical damage and sealing failure of the battery.

[0084] Please refer to Fig. 9 , Fig. 9 This is a fourth schematic diagram of the partial structure of a battery device according to some embodiments of the present application.

[0085] According to some embodiments of the present application, Fig. 9 As shown, the second portion 512 is perpendicular to the first portion 511 , and the orthographic projection of the fastener 40 on the bottom 13 completely falls within the range of the orthographic projection of the second portion 512 on the bottom 13 .

[0086] The first part 511 and the second part 512 can both be plate-like structures. In some embodiments, the second part 512 is perpendicular to the first part 511, the second part 512 is arranged in a horizontal direction, and the first part 511 is arranged in a vertical direction. The orthographic projection of the fastener 40 on the bottom 13 completely falls within the range of the orthographic projection of the second part 512 on the bottom 13. It can be understood that along the projection line perpendicular to the bottom 13, the projection of the second part 512 completely covers the projection of the fastener 40. In some embodiments, the bottom 13 is arranged in a horizontal direction, which means that the horizontal projection of the second part 512 completely covers the horizontal projection of the fastener 40.

[0087] The orthographic projection of the fastener 40 on the bottom 13 completely falls within the range of the orthographic projection of the second part 512 on the bottom 13, so that the protective member 50 can provide all-round protection for the fastener 40 and further improve the protection effect, thereby reducing the probability of damage to the fastener 40 due to external impact objects and reducing the possibility of battery damage and sealing failure.

[0088] Please refer to Fig.10 and Fig.11 , Fig.10 This is a fifth partial structural diagram of a battery device according to some embodiments of the present application. Fig.11 for Fig.10 A partial enlarged view of part B.

[0089] According to some embodiments of the present application, Fig.10 and Fig.11 As shown, an angle α formed by a side surface of the second portion 512 facing the fastener 40 and a side surface of the first portion 511 facing the fastener 40 is greater than 90 degrees (°) and less than 180 degrees (°).

[0090] like Fig.10 and Fig.11 As shown, the angle α is set to an obtuse angle and satisfies 90°<α<180°, wherein the value of the angle α can be 95°, 115°, 135°, 155° or 175°.

[0091] The embodiment of the present application selects a suitable angle range, which is beneficial to improving the blocking effect against external impact objects to enhance the protective effect of the protective member 50 on the fastener 40, thereby reducing the risk of physical damage to the battery and sealing failure.

[0092] According to some embodiments of the present application, Fig.10 and Fig.11 As shown, an angle α formed by a side surface of the second portion 512 facing the fastener 40 and a side surface of the first portion 511 facing the fastener 40 is greater than or equal to 110 degrees (°) and less than or equal to 150 degrees (°).

[0093] like Fig.10 and Fig.11 As shown, the angle α is set to an obtuse angle and satisfies 110°≤α≤150°, wherein the value of the angle α can be 110°, 120°, 130°, 140° or 150°.

[0094] If the angle α is set too large, on the one hand, it will occupy too much vertical space, reducing the ground clearance between the bottom of the battery device and the ground, and will also reduce the protection angle range for the fastener 40; and if the angle α is set too small, the relatively deformable space of the second part 512 will be limited.

[0095] The embodiment of the present application selects a suitable angle range, which is beneficial for more efficient use of space and for improving the blocking effect against external impact objects to enhance the protective effect of the protective member 50 on the fastener 40, thereby reducing the risk of physical damage to the battery and sealing failure.

[0096] According to some embodiments of the present application, Fig.10 and Fig.11 As shown, the second portion 512 includes at least one structural weakening portion 53 , and the structural weakening portion 53 is configured such that the second portion 512 is deformed at the location of the structural weakening portion 53 under the action of an external force.

[0097] The structural weakening part 53 refers to a local area in an overall structure, which has lower mechanical properties such as bearing capacity, strength, and stiffness than other parts due to design, material characteristics, manufacturing process, use environment or other factors. These areas are more likely to deform when the structure is subjected to external loads (such as tension, pressure, bending force, shear force, etc.). In the embodiment of the present application, under the action of external force, the structural weakening part 53 of the second part 512 is more likely to deform than other parts of the second part 512, so that the second part 512 is bent at the location of the structural weakening part 53.

[0098] By providing the structural weakening portion 53, the protective member 50 can absorb the collision energy brought by the external impact object by deformation, thereby improving the blocking of the external impact object to improve the protective effect of the protective member 50 on the fastener 40, and reduce the risk of physical damage to the battery and sealing failure. In addition, the position where the structural weakening portion 53 can be deformed under the action of external force can improve the degree of wrapping of the protective member 50 on the fastener 40, thereby achieving multi-directional protection of the fastener 40 by the protective member 50, and further reducing the probability of damage to the fastener 40 caused by external impact objects.

[0099] According to some embodiments of the present application, there are multiple structural weakening portions 53 , and the multiple structural weakening portions 53 are sequentially spaced apart from the connection between the first portion 511 and the second portion 512 in a direction away from the first portion 511 .

[0100] There are multiple structural weakening parts 53, and the specific number can be determined according to the length of the second part 512. In some embodiments, the number of structural weakening parts 53 is 2-15, and can be specifically 2, 5, 7, 10, 12 or 15. Taking the first part 511 and the second part 512 as base points, multiple structural weakening parts 53 are sequentially arranged in intervals from the base points in the second part 512. It should be understood that the interval arrangement does not mean continuous arrangement or distribution, but is regularly placed at a certain distance and space interval. The interval can be uniform or non-uniformly distributed according to specific design requirements (for example, according to different stress areas, functional partitions, etc.).

[0101] In the face of impact forces of different directions and intensities, multiple structural weakening parts 53 can provide better adaptability, and when one of the structural weakening parts 53 fails, the other structural weakening parts 53 still provide protection, which is fault-tolerant. In addition, multiple structural weakening parts 53 are arranged at intervals, which is conducive to guiding the external impact force to be evenly distributed in the protective member 50, thereby improving the protective member 50's blocking of external impact objects to improve the protective effect of the protective member 50 on the fastener 40, and reducing the risk of physical damage to the battery and sealing failure.

[0102] According to some embodiments of the present application, the second portion 512 includes a first region provided with a structural weakening portion 53 and a second region not provided with a structural weakening portion 53 , and a minimum thickness of the first region is smaller than a minimum thickness of the second region.

[0103] In some embodiments, Fig.10 and Fig.11 As shown, the first area and the second area can be staggered, and the minimum dimension of the first area along the direction perpendicular to the second part 512 is the minimum thickness d1, and the minimum dimension of the second area along the direction perpendicular to the second part 512 is the minimum thickness d2, wherein d1<d2.

[0104] The thickness of the structural weakening portion 53 has a significant impact on the collision energy absorption. By setting a first area with a smaller minimum thickness, the second portion 512 is facilitated to deform under external force to increase the degree of wrapping of the protective member 50 on the fastener 40, thereby achieving multi-directional protection of the fastener 40 by the protective member 50 and further reducing the probability of damage to the fastener 40 due to external impact objects.

[0105] According to some embodiments of the present application, the surface of the second portion 512 facing the fastener 40 includes a plurality of protrusions arranged at intervals, and a structural weakened portion 53 is formed between any two adjacent protrusions.

[0106] The raised portions are arranged at intervals on the surface of the second portion 512 facing the fastener 40, wherein the raised portions may be extended in the first direction X, and the extension directions of the plurality of raised portions may be parallel to each other. Fig.10 and Fig.11 As shown, in some embodiments, a concave portion is formed between any two adjacent protrusions, and the concave portion serves as a structural weakening portion 53. The cross-sectional shape of the protrusion along the direction perpendicular to its extension direction can be rectangular, triangular, semicircular or arc-shaped, etc., and the embodiments of the present application do not limit this.

[0107] By forming a structural weakening portion 53 between any two adjacent protrusions, the second portion 512 is facilitated to deform under external force to increase the degree of wrapping of the fastener 40 by the protective member 50, thereby achieving all-round protection of the fastener 40 by the protective member 50 and further reducing the probability of damage to the fastener 40 due to external impact objects.

[0108] According to some embodiments of the present application, Fig.10 and Fig.11 As shown, the ratio of the protruding height h1 of the main body 51 relative to the side surface of the bottom 13 away from the battery cell 20 to the protruding height h2 of the fastener 40 relative to the side surface of the bottom 13 away from the battery cell 20 satisfies: 1.5≤h1 / h2≤2.

[0109] In some embodiments, the specific value of h1 / h2 may be 1.5, 1.6, 1.7, 1.8 or 2. Since the thickness of the bottom 13 varies at different locations, the reference of h1 and h2 relative to the bottom 13 must be the same reference. Fig.11 For example, the side surface of the bottom 13 away from the battery cell 20 based on h1 and h2 is the surface close to the connection position between the fastener 40 and the bottom 13. Therefore, while improving the protection effect of the protective member 50 on the fastener 40, the space utilization rate can also be improved.

[0110] According to some embodiments of the present application, Figure 3-Figure 5 As shown, the bottom 13 includes a box bottom plate 131 and a bottom guard plate 30 . The bottom guard plate 30 is located on a side of the box bottom plate 131 away from the battery cell 20 and is connected to the box bottom plate 131 or the side portion 14 via a fastener 40 .

[0111] The box bottom plate 131 is a plate-shaped structure for directly supporting the battery cell 20 . The box bottom plate 131 can be integrally formed with the side portion, or can be manufactured separately and connected to form a box structure with a receiving cavity.

[0112] The bottom guard plate 30 is located on the side of the box bottom plate 131 away from the battery cell 20, and can be understood as being installed on the outermost layer of the box bottom plate 131. The bottom guard plate 30 is an additional protective structure located on the box bottom plate 131, which is in direct contact with the external environment. The bottom guard plate 30 is the first line of defense for the battery box 10 to resist various potential damages from the box bottom plate 131. Taking the vehicle as the application scenario, the bottom guard plate 30 can prevent the battery box 10 from being hit by bumps, stones or other obstacles on the road surface and play a role in waterproofing, dustproofing and heat insulation.

[0113] The bottom guard plate 30 is connected to the bottom plate 131 or the side 14 of the box body through the fastener 40, wherein the fastener 40 may be a bolt structure or a rivet structure. In some embodiments, the bottom guard plate 30 and the bottom plate 131 of the box body are both preset with corresponding bolt holes, and the bottom guard plate 30 is firmly connected to the bottom plate 131 of the box body by passing the bolts through the bolt holes and fastening them with nuts. It should be understood that after the fastener 40 completes the connection between the bottom guard plate 30 and the bottom plate 131 of the box body, a part of the fastener 40 will still protrude from the side surface of the bottom guard plate 30 away from the bottom plate 131 of the box body. Taking the bolt structure as an example of the fastener 40, the bolt includes a bolt head and a screw, wherein the bolt head will protrude from the side surface of the bottom guard plate 30 away from the bottom plate 131 of the box body.

[0114] By providing a protective member 50 to protect the fastener 40, it is helpful to improve the stability of the connection between the bottom guard plate 30 and the bottom plate 131 of the box body, reduce the probability of damage to the fastener 40 due to external impact objects, thereby maintaining the fastening effect of the fastener 40 and reducing the risk of local structural rupture or even physical damage to the battery due to the pulling of the fastener 40. In addition, protecting the fastener 40 with the protective member 50 is helpful to improve the integrity of the fastener 40 during use, facilitate the maintenance and replacement of the bottom guard plate 30 in the later stage, and improve the installation flexibility. In addition, by providing the protective member 50, the fastening pressure of the fastener 40 can be maintained, thereby reducing the possibility of sealing failure.

[0115] According to some embodiments of the present application, Figure 3-Figure 6 As shown, the bottom guard plate 30 includes a first guard portion 31, a second guard portion 32 and a transition portion 33; the first guard portion 31 is located in the central area of ​​the bottom guard plate 30; the second guard portion 32 is arranged around the periphery of the first guard portion 31; the transition portion 33 connects the first guard portion 31 and the second guard portion 32; wherein the second guard portion 32 is offset relative to the first guard portion 31 toward the side where the battery cell 20 is located, and the fastener 40 is arranged on the second guard portion 32, and the fastener 40 is at least partially located on the side surface of the second guard portion 32 away from the battery cell 20.

[0116] The first guard portion 31 is located in the central area of ​​the bottom guard plate 30. It can be understood that the first guard portion 31 is at the center position or close to the center position of the bottom guard plate 30, wherein the center position of the bottom guard plate 30 is the geometric center of the bottom guard plate 30; the second guard portion 32 is arranged around the periphery of the first guard portion 31. Specifically, the second guard portion 32 is arranged outside the first guard portion 31. In some embodiments, the second guard portion 32 presents a surrounding shape; the transition portion 33 can make the first guard portion 31 and the second guard portion 32 smoothly connected together, thereby improving the smoothness of force transmission and reducing stress concentration.

[0117] The second protection part 32 is offset relative to the first protection part 31 toward the side where the battery cell 20 is located. Specifically, it can be understood that the second protection part 32 and the first protection part 31 are "stepped", wherein along the third direction Z, the second protection part 32 is closer to the battery cell 20 than the first protection part 31, and the fastener 40 is connected to the box bottom plate 131 through the second protection part 32 to achieve the connection and fixation of the box bottom plate 131 and the bottom guard plate 30. In addition, the fastener 40 is at least partially located on the side surface of the second protection part 32 away from the battery cell 20. In some embodiments, taking the fastener as a bolt structure as an example, the bolt head will protrude from the side surface of the second protection part 32 away from the battery cell 20.

[0118] The second protective portion 32 is offset relative to the first protective portion 31 toward the side where the battery cell 20 is located, and the fastener 40 is arranged on the second protective portion 32, which is beneficial for the first protective portion 31 to protect the fastener 40 while protecting the bottom plate 131 of the box body, thereby further improving the stability of the connection between the bottom guard plate 30 and the bottom plate 131 of the box body, and reducing the probability of battery damage and sealing failure.

[0119] According to some embodiments of the present application, Figure 3-Figure 6 As shown, the number of fasteners 40 is multiple and arranged at intervals along the outer periphery of the bottom 13; wherein, the number of protective members 50 is multiple, and the multiple protective members 50 are arranged at intervals along the outer periphery of the bottom 13 and are arranged corresponding to the fasteners 40. In some embodiments, the number of protective members 50 is one, and is continuously arranged along the outer periphery of the bottom 13.

[0120] like Figure 3 and Figure 4As shown, there are multiple fasteners 40 for connecting the box bottom plate 131 and the bottom guard plate 30, wherein the arrangement of the fasteners 40 can be arranged around the horizontal circumferential interval with the geometric center of the bottom 13 as the center. Correspondingly, multiple protective members 50 can also be arranged along the outer periphery of the bottom 13, wherein the protective members 50 can be arranged corresponding to the fasteners 40, for example, the two have the same number and are arranged one-to-one, or the number of protective members can be less than the fasteners 40, and they are arranged in a one-to-many manner, that is, one protective member can simultaneously protect multiple adjacent fasteners 40.

[0121] In other embodiments, the protective member 50 is a structural member continuously arranged along the outer circumference of the bottom 13 , so that the protective member 50 can surround all the fasteners 40 , thereby protecting multiple fasteners 40 .

[0122] By correspondingly arranging a plurality of fasteners 40 and protective members 50, the fasteners 40 arranged at a plurality of positions of the bottom 13 can be protected in all directions, further reducing the probability of the fasteners 40 being damaged by external impact objects, thereby maintaining the fastening effect of the fasteners 40 and reducing the risk of physical damage and sealing failure of the battery.

[0123] According to some embodiments of the present application, Figure 3-Figure 6 As shown, the protective member 50 and the side portion 14 of the box body 10 are an integrally formed structure.

[0124] As a manufacturing process, one-piece molding refers to the process of molding multiple parts or the entire product structure in one go through specific technical means during the manufacturing process, without subsequent assembly processes such as splicing and welding. One-piece molding is widely used in the fields of plastic products, metal products and composite materials. Taking plastic products as an example, after the plastic particles are melted at high temperature, they can be formed into plastic products with complex shapes at one time through molds.

[0125] The protective member 50 and the side portion 14 of the box body 10 are an integrally formed structure, which can reduce the subsequent processing or assembly steps and is conducive to improving production efficiency.

[0126] According to some embodiments of the present application, Figure 8-Figure 11 As shown, the protection member 50 is detachably connected to the side portion 14 of the box body 10 .

[0127] As a mechanical connection method, detachable connection allows two or more parts to be connected together and can be easily disassembled when needed without damaging the parts. Common detachable connection methods include screw connection, snap connection and pin connection. Figure 8-Figure 11In the illustrated embodiment, the protective member 50 is connected to the side portion 14 of the box body 10 by screws, wherein a threaded hole is preset in the side portion 14, and the screw is directly screwed into the threaded hole of the side portion 14 to achieve the fixing of the protective member 50 and the box body 10. The detachable connection between the protective member 50 and the side portion 14 of the box body 10 is conducive to the maintenance and replacement of the protective member 50, thereby further improving the protective effect of the protective member 50 on the fastener 40.

[0128] According to some embodiments of the present application, the material yield strength of the protective element 50 is greater than or equal to 240 MPa.

[0129] The protective member 50 may be specifically made of an aluminum-magnesium-silicon alloy, such as a 6061-T6 series alloy, or may be roll-formed from steel, such as DP590 material and DP780 material.

[0130] By setting the yield strength of the material of the protective member 50 to be greater than or equal to 240 MPa, it is beneficial to improve the deformation resistance and load-bearing capacity of the protective member 50, thereby reducing the probability of damage to the fastener 40 due to external impact objects, further improving the protective effect of the protective member 50 on the fastener 40, and reducing the possibility of battery damage and sealing failure.

[0131] An embodiment of the present application provides an electrical device, which includes the battery device 100 as described in the above embodiment.

[0132] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0133] The electric device of the embodiment of the present application includes the battery device 100 in the aforementioned embodiment, which also has the beneficial effects of the aforementioned embodiment and can improve the protection capability of the battery device.

[0134] like Figure 3 and Figure 4 As shown, the battery device 100 of the embodiment of the present application includes at least one battery cell 20, a box body 10 and a protective member 50; the box body 10 is used to accommodate the battery cell 20, and the box body 10 includes a bottom 13 for supporting the battery cell 20 and a side 14 connected to the bottom 13, and a fastener 40 at least partially protruding from the bottom 13 and provided on a side surface away from the battery cell 20; the protective member 50 is connected to the box body 10, and the protective member 50 is a plate; wherein, along the thickness direction of the protective member 50, the fastener 40 is located on a side of the protective member 50 close to the geometric center of the bottom 13, and the protective member 50 at least partially protrudes from the side surface of the bottom 13 away from the battery cell 20.

[0135] The bottom 13 includes a box bottom plate 131 and a bottom guard plate 30. The bottom guard plate 30 is located on a side of the box bottom plate 131 away from the battery cell 20 and is connected to the box bottom plate 131 or the side 14 through a fastener 40. The bottom guard plate 30 includes a first protective portion 31, a second protective portion 32 and a transition portion 33. The first protective portion 31 is located in the central area of ​​the bottom guard plate 30. The second protective portion 32 is arranged around the periphery of the first protective portion 31. The transition portion 33 connects the first protective portion 31 and the second protective portion 32. The second protective portion 32 is offset relative to the first protective portion 31 toward the side where the battery cell 20 is located. The fastener 40 is arranged on the second protective portion 32. The fastener 40 is at least partially located on a side surface of the second protective portion 32 away from the battery cell 20.

[0136] In addition, the fastener 40 protrudes along the vertical direction on the side of the bottom 13 away from the battery cell 20; the protective member 50 includes a connecting portion 52 and a main body portion 51, the connecting portion 52 is connected to the side portion 14, and the main body portion 51 protrudes toward the side of the bottom 13 away from the battery cell 20; wherein the protruding height of the main body portion 51 relative to the side surface of the bottom 13 away from the battery cell 20 is greater than or equal to the protruding height of the fastener 40 relative to the side surface of the bottom 13 away from the battery cell 20.

[0137] like Figure 5 and Figure 6 In one embodiment shown in FIG. 1 , a side surface of the main body portion 51 facing the fastener 40 is parallel to the vertical direction; Figure 7 and Figure 8 In the embodiment shown, the main body 51 includes a first portion 511 and a second portion 512 arranged in the vertical direction, the second portion 512 is connected to the first portion 511 and is located on a side of the first portion 511 away from the connecting portion 52, and the second portion 512 is bent relative to the first portion 511 toward the side where the fastener 40 is located. Figure 7 The protective member 50 of the embodiment is welded to the side portion 14. Figure 8 The guard 50 of the embodiment is screwed to the side portion 14 .

[0138] like Fig. 9In one embodiment shown, the main body 51 includes a first portion 511 and a second portion 512 arranged in the vertical direction, the second portion 512 is connected to the first portion 511 and is located on a side of the first portion 511 away from the connecting portion 52, and the second portion 512 is bent relative to the first portion 511 toward the side where the fastener 40 is located. Specifically, the second portion 512 is perpendicular to the first portion 511, and the orthographic projection of the fastener 40 on the bottom 13 completely falls within the range of the orthographic projection of the second portion 512 on the bottom 13. In addition, the protective member 50 is detachably connected to the side portion 14 of the box body 10, and the material yield strength of the protective member 50 is greater than or equal to 240 MPa.

[0139] Combination Fig.10 and Fig.11 Another embodiment of the battery device 100 of the present application is described. The main body 51 of the protective member 50 includes a first portion 511 and a second portion 512 arranged in the vertical direction. The second portion 512 is connected to the first portion 511 and is located on a side of the first portion 511 away from the connecting portion 52. The second portion 512 is bent relative to the first portion 511 toward the side where the fastener 40 is located. Specifically, the angle formed by the side surface of the second portion 512 facing the fastener 40 and the side surface of the first portion 511 facing the fastener 40 is greater than or equal to 110° and less than or equal to 150°, and the second portion 512 includes at least one structural weakening portion 53, and the structural weakening portion 53 is configured so that the second portion 512 is deformed at the location of the structural weakening portion 53 under the action of an external force, and the surface of the second portion 512 facing the fastener 40 includes a plurality of protrusions arranged at intervals, and a structural weakening portion 53 is formed between any two adjacent protrusions. In addition, the ratio of the protruding height h1 of the main body 51 relative to the side surface of the bottom 13 away from the battery cell 20 to the protruding height h2 of the fastener 40 relative to the side surface of the bottom 13 away from the battery cell 20 satisfies: 1.5≤h1 / h2≤2, the protective member 50 is connected to the side 14 of the box body 10 by screws, and the material yield strength of the protective member 50 is greater than or equal to 240 MPa.

[0140] 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, characterized in that: include: at least one battery cell, A box body, used to accommodate the battery monomer, the box body comprising a bottom for supporting the battery monomer and a side connected to the bottom, and a fastener at least partially protruding from the bottom and provided with a surface on one side away from the battery monomer; A protective member connected to the box body, wherein the protective member is a plate; Wherein, along the thickness direction of the protective member, the fastener is located on a side of the protective member close to the geometric center of the bottom, and the protective member at least partially protrudes from a side surface of the bottom away from the battery cell.

2. The battery device according to claim 1, characterized in that: The fastener is partially protruded along the vertical direction on a side of the bottom away from the battery cell; The protective member includes a connecting portion and a main body portion, wherein the connecting portion is connected to the side portion, and the main body portion protrudes toward a side of the bottom away from the battery cell; Wherein, a protruding height of the main body relative to a side surface of the bottom away from the battery cell is greater than or equal to a protruding height of the fastener relative to a side surface of the bottom away from the battery cell.

3. The battery device according to claim 2, characterized in that: A side surface of the main body facing the fastener is parallel to the vertical direction.

4. The battery device according to claim 2, characterized in that: The main body comprises: The first part is arranged in a vertical direction; and A second part connected to the first part and located on a side of the first part away from the connecting portion; Wherein, the second portion is bent relative to the first portion toward the side where the fastener is located.

5. The battery device according to claim 4, characterized in that: The second portion is perpendicular to the first portion, and an orthographic projection of the fastener on the bottom portion completely falls within a range of an orthographic projection of the second portion on the bottom portion.

6. The battery device according to claim 4, characterized in that: An angle formed by a side surface of the second portion facing the fastener and a side surface of the first portion facing the fastener is greater than 90° and less than 180°.

7. The battery device according to claim 4, characterized in that: An angle formed by a side surface of the second portion facing the fastener and a side surface of the first portion facing the fastener is greater than or equal to 110° and less than or equal to 150°.

8. The battery device according to any one of claims 4 to 7, characterized in that: The second portion includes at least one structural weakening portion, and the structural weakening portion is configured to cause the second portion to deform at a location where the structural weakening portion is located under the action of an external force.

9. The battery device according to claim 8, characterized in that: There are multiple structural weakening parts, and the multiple structural weakening parts are sequentially spaced from the connection between the first part and the second part in a direction away from the first part.

10. The battery device according to claim 8, characterized in that: The second portion includes a first region provided with the structural weakening portion and a second region not provided with the structural weakening portion, and a minimum thickness of the first region is smaller than a minimum thickness of the second region.

11. The battery device according to claim 9, characterized in that: The surface of the second portion facing the fastener includes a plurality of protrusions arranged at intervals, and the structural weakened portion is formed between any two adjacent protrusions.

12. The battery device according to any one of claims 2 to 7, characterized in that: A ratio of a protruding height h1 of the main body relative to a side surface of the bottom away from the battery cell to a protruding height h2 of the fastener relative to a side surface of the bottom away from the battery cell satisfies: 1.5≤h1 / h2≤2.

13. The battery device according to claim 12, characterized in that: The bottom comprises a box bottom plate and a bottom guard plate. The bottom guard plate is located on a side of the box bottom plate away from the battery cell and is connected to the box bottom plate or the side portion through the fastener.

14. The battery device according to claim 13, characterized in that: The bottom guard plate includes A first protection portion, located in the central area of ​​the bottom guard plate; a second protection portion, arranged around the outer periphery of the first protection portion, and a transition portion, connecting the first protection portion and the second protection portion; The second protection part is offset relative to the first protection part toward the side where the battery cell is located, the fastener is arranged on the second protection part, and the fastener is at least partially located on a side surface of the second protection part away from the battery cell.

15. The battery device according to any one of claims 1 to 7, characterized in that: The number of the fasteners is plural and they are arranged at intervals along the outer circumference of the bottom; There are multiple protective members, which are spaced apart along the outer circumference of the bottom and arranged corresponding to the fasteners; or there is only one protective member, which is continuously arranged along the outer circumference of the bottom.

16. The battery device according to any one of claims 1 to 7, characterized in that: The protective member and the side portion of the box body are integrally formed.

17. The battery device according to any one of claims 1 to 7, characterized in that: The protective member is detachably connected to the side of the box body.

18. The battery device according to any one of claims 1 to 7, characterized in that: The material yield strength of the protective member is greater than or equal to 240 MPa.

19. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1-18.

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