Battery and electric device

Abstract

The utility model is suitable for the technical field of power batteries, and provides a battery and a power utilization device. The box body comprises a lower box body and an upper box body covering the lower box body, the upper box body and the lower box body define a containing cavity used for containing the battery monomers, and the upper box body comprises an inner surface facing the containing cavity; the structural part is used for improving the strength of the box body and comprises a base layer and a surface layer connected to the base layer, the base layer is connected to the inner surface, and the surface layer is arranged on the side, facing the containing cavity, of the structural part; according to the battery provided by the invention, the structural member is arranged on the inner surface of the upper box body, so that the strength of the upper box body is enhanced through the structural member; the structural part is arranged to be of the structure with the at least two layers, so that the structural part can be combined by selecting different materials according to needs, the structural part can meet different requirements, and different effects are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery 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] In current batteries, the upper cover of the battery box is usually a sheet metal part or a plastic part, and the strength of the upper cover is usually weak, and the protection effect of the battery cells in the box is poor. Utility Model Content

[0004] In view of the above problems, the present application provides a battery and an electrical device that can alleviate the problem of poor strength of the upper cover of the battery box.

[0005] In a first aspect, the present application provides a battery, comprising:

[0006] A battery cell; a box body, comprising a lower box body and an upper box body covering the lower box body, the upper box body and the lower box body define a receiving cavity for receiving the battery cell, and the upper box body comprises an inner surface facing the receiving cavity; a structural member, used to improve the strength of the box body, the structural member comprises a base layer and a surface layer connected to the base layer, the base layer is connected to the inner surface, and the surface layer is arranged on a side of the structural member facing the receiving cavity.

[0007] In the technical solution of this embodiment, structural members are arranged on the inner surface of the upper box body to strengthen the strength of the upper box body through the structural members; the structural members are arranged to have at least two layers of structure, so that the structural members can be combined with different materials as needed, so that the structural members can meet different needs and achieve different effects.

[0008] In some embodiments, the strength of the base layer is less than or equal to the strength of the surface layer.

[0009] In the technical solution of this embodiment, the strength of the base layer is relatively low, so that the base layer has better toughness, so that the base layer is not prone to brittle fracture when subjected to the force transmitted by the upper box body, thereby enabling the base layer to absorb part of the force to improve the strength of the upper box body; the strength of the surface layer is relatively high, so that the strength of the upper box body is strengthened through the surface layer.

[0010] In some embodiments, the elastic modulus of the base layer is less than or equal to the elastic modulus of the surface layer; the elastic modulus of the base layer is greater than or equal to 800 MPa, and the elastic modulus of the surface layer is greater than or equal to 5000 MPa.

[0011] The technical solution of this embodiment provides some ranges of elastic modulus of the base layer and the surface layer, the elastic modulus of the base layer is smaller, while the elastic modulus of the surface layer is larger, so that the base layer can mainly play the role of absorbing energy and transmitting force, and the surface layer can mainly play the role of strengthening the upper box body.

[0012] In some embodiments, the elastic modulus of the base layer is greater than or equal to 1000 MPa, and the elastic modulus of the surface layer is greater than or equal to 6000 MPa.

[0013] The technical solution of this embodiment further provides some ranges of elastic moduli of the base layer and the surface layer, so that on the premise that the base layer can mainly play the role of absorbing energy and transmitting force, the base layer and the surface layer can also play the role of strengthening the upper box body.

[0014] In some embodiments, the thickness of the base layer is greater than the thickness of the surface layer.

[0015] In the technical solution of this embodiment, the thickness of the base layer is relatively thick, so that the base layer can be deformed after being subjected to force and is not easily broken, thereby facilitating the base layer to absorb part of the energy it bears; the thickness of the surface layer is relatively thin, and when the strength of the surface layer meets the requirements, the space occupied by the surface layer is reduced.

[0016] In some embodiments, the thickness of the base layer ranges from 1.0 mm to 2.0 mm, and the thickness of the surface layer ranges from 0.1 mm to 0.3 mm.

[0017] The technical solution of this embodiment provides some thickness ranges for the base layer and the surface layer, wherein the thickness of the base layer is relatively large and the thickness of the surface layer is relatively small, so that the base layer can mainly play the role of transmitting force and absorbing energy and reduce the space occupied by the surface layer.

[0018] In some embodiments, the surface layer is a fireproof material layer; and the base layer is an adhesive material layer to bond the surface layer to the inner surface.

[0019] In the technical solution of this embodiment, the base layer is a sticky material layer, so as to facilitate the connection of the surface layer to the upper box body, and also facilitate the base layer to absorb energy, thereby improving the strength of the upper box body; the surface layer is a fireproof material layer, and when the strength of the surface layer meets the requirements, the surface layer can hinder the diffusion of heat in the event of thermal runaway of the battery, thereby reducing the negative impact of thermal runaway of the battery on the outside world.

[0020] In some embodiments, the material of the base layer includes one of epoxy resin and rubber, and the material of the surface layer includes one of glass fiber, polycarbonate and polyvinylidene fluoride resin.

[0021] The technical solution of this embodiment provides some specific materials for the base layer and the surface layer, so that the base layer can mainly play the role of energy absorption and bonding, and the surface layer can mainly play the role of strengthening the upper box body and fire prevention.

[0022] In some embodiments, the battery cell includes a pressure relief structure; in the height direction of the box body, the projection of the pressure relief structure on the inner surface is located in the projection of the structural member on the inner surface.

[0023] In the technical solution of this embodiment, the structural member is located above the battery cell pressure relief structure in the height direction of the battery. In the event of thermal runaway of the battery cell, the high-temperature and high-pressure flue gas ejected from the pressure relief structure can first contact the structural member, thereby reducing the damage of the high-temperature and high-pressure flue gas to the upper box body, alleviating the impact force transmitted to the external environment of the battery, and reducing the temperature transmitted to the external environment of the battery.

[0024] In some embodiments, ribs are protruding from the upper box body in the direction toward the inner surface; in the height direction of the box body, the projection of the structural member on the inner surface is staggered with the projection of the ribs on the inner surface.

[0025] In the technical solution of this embodiment, the structural members are staggered with the ribs. When the structural members are arranged on the upper box body, this arrangement can reduce the thickness of the upper box body at the ribs, thereby reducing the overall thickness of the upper box body and reducing the space occupied by the upper box body.

[0026] In some embodiments, the upper box body is made of metal material through a stamping process; or the upper box body includes a profile.

[0027] The technical solution of this embodiment provides some structures of the upper box body so that the upper box body can have higher strength.

[0028] In some embodiments, a beam is provided in the lower box body, which divides the accommodating cavity into at least a first cavity and a second cavity, and the battery cell is accommodated in the first cavity; in the height direction of the box body, the projection of the second cavity on the inner surface is staggered with the projection of the structural member on the inner surface.

[0029] In the technical solution of this embodiment, the structural member is mainly opposite to the battery cells in the box body, and the structural member is not easily extended to other positions of the upper box body, so that the structural member can not only play a role in strengthening the strength of the upper box body, but also reduce the overall size of the structural member, reduce the space occupied by the structural member, reduce the overall weight of the upper box body, and reduce the cost of the structural member.

[0030] In some embodiments, the base layer is protruded from the inner surface toward a direction close to the battery cell.

[0031] In the technical solution of this embodiment, the structural member is protruded from the inner surface, which can better increase the strength of the upper box body and reduce the difficulty of installing the structural member.

[0032] In a second aspect, some embodiments of the present application further provide an electrical device, comprising the battery provided by some embodiments of the first aspect.

[0033] 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

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0036] Figure 2 A schematic diagram of an exploded structure of a battery provided in some embodiments of the present application;

[0037] Figure 3 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0038] Figure 4 A three-dimensional schematic diagram of an upper box provided in some embodiments of the present application;

[0039] Figure 5 A schematic cross-sectional view of a structural member provided in some embodiments of the present application;

[0040] Figure 6 A schematic top view of an upper box provided in some embodiments of the present application;

[0041] Figure 7 for Figure 6 Schematic cross-sectional view at AA in the middle;

[0042] Figure 8 for Figure 7 A partial enlarged schematic diagram of point B in the middle;

[0043] Fig. 9 A schematic top view of a lower box provided in some embodiments of the present application.

[0044] The meanings of the marks in the figure are:

[0045] 1000. Vehicles;

[0046] 100. Battery;

[0047] 10. Box body; 101. Accommodating cavity; 11. Upper box body; 111. Inner surface; 112. Ribs; 12. Lower box body; 121. Beam body; 122. First cavity; 123. Second cavity;

[0048] 20. Battery cell; 21. Shell; 22. End cover; 23. Electrode assembly; 24. Pressure relief structure;

[0049] 30. Structural parts; 31. Base layer; 32. Surface layer;

[0050] 200, motor;

[0051] 300. Controller. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In current batteries, the battery box usually includes a lower box and an upper box. The lower box is mainly used to carry and protect the battery cells, so the strength of the lower box is usually higher. Compared with the lower box, the upper box is mainly used to block the interference of the environment outside the box on the battery cells, so the upper box is usually a sheet metal part, a plastic part or other low-strength structural parts.

[0062] However, during the transportation, installation and use of batteries, the upper box is susceptible to external collisions. For example, for batteries in the transportation process, the upper box is prone to bumping against the corners and edges of the batteries next to it, causing dents and damage, and even causing damage to the battery cells inside the box. For another example, for batteries used in vehicles, debris such as gravel during vehicle driving can easily collide with the upper box, causing the upper box to dent and deform, which can easily cause the upper box to be damaged during long-term driving, and cause the box to fail to protect the battery cells.

[0063] Based on the above considerations, in order to alleviate the problem of poor strength of the upper box body of the battery box, an embodiment of the present application provides a battery, wherein a structural member is arranged in the battery box, and the structural member is arranged on the side of the upper box body facing the battery cell; the structural member includes a base layer and a surface layer connected to the base layer, and the base layer is connected to the upper box body, so that the surface layer faces the accommodating cavity.

[0064] In such a battery, the structural member is integrated on the upper box body, thereby enhancing the strength of the upper box body. The structural member is set to a structure of at least two layers. When the upper box body is subjected to force, each layer of the structural member can share and distribute the force exerted on the upper box body, and each layer of the structural member can provide support for the upper box body to improve the strength of the upper box body; at the same time, the structural member can be combined with different materials as needed, so that the structural member can also meet different needs and achieve different effects, such as fire prevention, heat insulation, etc.

[0065] The battery disclosed in the embodiments of the present application can be used in an electrical device that uses the battery as a power source or in various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0066] 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.

[0067] refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 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 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200, and the controller 300 is used to control the battery 100 to power the motor 200, for example, for starting, navigating and driving the vehicle 1000.

[0068] In some embodiments of the present application, the battery 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.

[0069] refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided for some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, wherein the battery cell 20 is contained in the housing 10. There may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells 20 are both connected in series and in parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is contained in the housing 10; of course, the battery 100 may also be a battery 100 module in which multiple battery cells 20 are first connected in series, in parallel, or in mixed connection, and multiple battery 100 modules are then connected in series, in parallel, or in mixed connection to form a whole, and contained in the housing 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0070] Each battery cell 20 may be a secondary battery cell or a primary battery cell, or a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0071] refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery 100. As shown in the figure, the battery cell 20 includes an end cap 22, a housing 21, an electrode assembly 23 and other functional components.

[0072] The end cap 22 refers to a component that covers the opening of the shell 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 22 can be adapted to the shape of the shell 21 to match the shell 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 22 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 22. The electrode terminal can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 22 can also be provided with a pressure relief structure 24 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 22 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 22, and the insulating member may be used to isolate the electrical connection components in the housing 21 from the end cap 22 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0073] The shell 21 is a component used to cooperate with the end cap 22 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 21 and the end cap 22 can be independent components, and an opening can be set on the shell 21, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 22 at the opening. Without limitation, the end cap 22 and the shell 21 can also be integrated. Specifically, the end cap 22 and the shell 21 can form a common connection surface before other components are put into the shell, and when the interior of the shell 21 needs to be encapsulated, the end cap 22 covers the shell 21. The shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0074] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 21. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0075] First, refer to Figures 2 to 5 The embodiment of the present application provides a battery 100, including a battery cell 20, a box body 10 and a structural member 30. The box body 10 includes a lower box body 12 and an upper box body 11 covering the lower box body 12, the upper box body 11 and the lower box body 12 define a receiving cavity 101 for receiving the battery cell 20, and the upper box body 11 includes an inner surface 111 facing the receiving cavity 101; the structural member 30 includes a base layer 31 and a surface layer 32 connected to the base layer 31, the base layer 31 is connected to the inner surface 111, and the surface layer 32 is provided on the side of the structural member 30 facing the receiving cavity 101.

[0076] The box body 10 is used to provide a storage space for the battery cells 20 . The box body 10 may include a frame structure, a box structure or other structures. The shape of the box body 10 may be a rectangular parallelepiped, a cylinder or other shapes.

[0077] The upper box body 11 and the lower box body 12 refer to partial structures of the box body 10. The upper box body 11 and the lower box body 12 can jointly define a accommodating cavity 101 to accommodate the battery cell 20; the upper box body 11 can directly cover and be connected to the lower box body 12, or it can be indirectly connected to the lower box body 12 through an intermediate structure; the upper box body 11 can be fixedly connected to the lower box body 12 by welding, bonding or other methods, and can also be detachably connected to the lower box body 12 by snap-on, screw-on or other methods.

[0078] The upper box body 11 can be a hollow structure with one end open to accommodate part or all of the structure of the battery cell 20. The upper box body 11 can also be a plate-like structure. The shape of the upper box body 11 can be rectangular, cylindrical or other shapes. The material of the upper box body 11 can include metal, plastic or other materials.

[0079] The lower box body 12 can be a hollow structure with one end open to accommodate part or all of the structure of the battery cell 20. The lower box body 12 can also be a plate-like structure. The shape of the lower box body 12 can be rectangular, cylindrical or other shapes. The material of the lower box body 12 can include metal, plastic or other materials.

[0080] The lower box body 12 can be connected to the vehicle 1000 to fix the battery 100 on the vehicle 1000 . At this time, the upper box body 11 covers the lower box body 12 .

[0081] The inner surface 111 refers to the surface of the upper box body 11 facing the accommodating cavity 101. When the battery cell 20 is accommodated in the box body 10, the inner surface 111 faces the battery cell 20; the inner surface 111 can be a flat plane, an uneven surface, a curved surface or a surface of other shapes. Depending on the shape of the upper box body 11, the inner surface 111 can include a portion opposite to the top of the upper box body 11, and can also include a portion opposite to the side of the upper box body 11; depending on the shape of the upper box body 11, the shape of the inner surface 111 can be square, circular or other shapes.

[0082] The structural member 30 refers to a structure in the battery 100 that is connected to the upper box body 11 to enhance the strength of the upper box body 11. Compared with arranging the structural member 30 on the side of the upper box body 11 facing the outside of the box body 10, arranging the structural member 30 on the inner surface 111 can not only improve the strength of the upper box body 11 through the structural member 30, but also reduce the volume change of the upper box body 11 and reduce the space occupied by the upper box body 11.

[0083] The base layer 31 refers to the structure in the structural member 30 that is connected to the upper box body 11, and the surface layer 32 refers to the structure in the structural member 30 that faces the side of the accommodating cavity 101; the shape of the base layer 31 can be circular, square or other shapes, and the shape of the surface layer 32 can be circular, square or other shapes. The shape of the base layer 31 can be the same as or different from the shape of the surface layer 32, and the shapes of the base layer 31 and the surface layer 32 can also be set according to the shape of the structural member 30; the thickness of the base layer 31 can be the same as or different from the thickness of the surface layer 32.

[0084] The material of the base layer 31 may be the same as or different from that of the surface layer 32. For example, according to the setting requirements of the structural member 30, the materials of the base layer 31 and the surface layer 32 may respectively have one or more of insulation, heat insulation, fire prevention or other functions.

[0085] The base layer 31 may only cover a portion of the inner surface 111 , for example, the base layer 31 may only be opposite to the top of the upper box body 11 ; the base layer 31 may also cover the entire inner surface 111 .

[0086] The base layer 31 may be protruding from the inner surface 111, or a groove may be provided on the inner surface 111, and the base layer 31 and / or the surface layer 32 may be embedded in the groove. When the base layer 31 is embedded in the groove, the base layer 31 and the surface layer 32 may be completely embedded in the groove, so that the structural member 30 may be completely embedded in the groove; or part of the surface layer 32 may be embedded in the groove, and another part of the surface layer 32 may be protruding from the inner surface 111; or part of the base layer 31 may be embedded in the groove, and another part of the base layer 31 and the surface layer 32 may be protruding from the inner surface 111.

[0087] When the upper box body 11 is subjected to an external collision, the upper box body 11 can transfer part of the force and energy generated by the collision to the base layer 31, and transfer it to the surface layer 32 through the base layer 31; the base layer 31 is mainly used to transfer force to the surface layer 32, and share part of the force and absorb part of the energy in the process of force transmission; the surface layer 32 is mainly used to bear the force and energy transmitted by the base layer 31; accordingly, the structural member 30 can share and absorb the force and energy borne by the upper box body 11 through the base layer 31 and the surface layer 32, thereby achieving the effect of improving the strength of the upper box body 11.

[0088] In the event of thermal runaway of the battery cell 20, since the structural member 30 is disposed on the inner surface 111, the structural member 30 can also prevent the high-temperature and high-pressure flue gas generated by the thermal runaway of the battery cell 20 from directly contacting the upper box body 11, thereby protecting the upper box body 11; at the same time, the structural member 30 can also alleviate the impact of the high-temperature and high-pressure flue gas on the upper box body 11, so as to reduce the deformation of the upper box body 11, thereby achieving the effect of improving the strength of the upper box body 11.

[0089] In this embodiment, the structural member 30 is integrated on the upper box body 11, thereby enhancing the strength of the upper box body 11. The structural member 30 is set to a structure of at least two layers, and when the upper box body 11 is subjected to force, each layer of the structural member 30 can share and distribute the force exerted on the upper box body 11, and each layer of the structural member 30 can provide support for the upper box body 11 to improve the strength of the upper box body 11; at the same time, the structural member 30 can be combined with different materials as needed, so that the structural member 30 can also meet different needs and achieve different effects, such as fire prevention, heat insulation, etc.

[0090] refer to Figure 4 , Figure 5 In some embodiments, the strength of the base layer 31 is less than or equal to the strength of the surface layer 32 .

[0091] In the figure, the direction of the X-axis is the length direction of the upper box body 11, which is also the length direction of the structural member 30; the direction of the Y-axis is the width direction of the upper box body 11, which is also the width direction of the structural member 30; the direction of the Z-axis is the height direction of the upper box body 11, which is also the thickness direction of the structural member 30.

[0092] Since the base layer 31 is mainly used to connect the surface layer 32 to the upper box body 11, the strength of the base layer 31 can be relatively low, so that the base layer 31 can be easily processed; at the same time, the relatively low strength of the base layer 31 also enables the base layer 31 to have better toughness. When the upper box body 11 is subjected to force, this arrangement enables the base layer 31 to be more easily deformed and less likely to break, so that the base layer 31 can better transfer part of the force it bears to the surface layer 32. At the same time, the deformation of the base layer 31 also facilitates it to better absorb energy, thereby playing a role in improving the strength of the upper box body 11.

[0093] When the base layer 31 is mainly used for transmitting force and absorbing energy, the surface layer 32 is mainly used for providing support for the upper box body 11 , so the strength of the surface layer 32 can be higher, so that the surface layer 32 can better provide support for the upper box body 11 and improve the strength of the upper box body 11 .

[0094] In this embodiment, the strength of the base layer 31 is relatively low, so that the base layer 31 has better toughness, so that the base layer 31 is not prone to brittle fracture when subjected to the force transmitted by the upper box body 11, so that the base layer 31 can absorb part of the force to improve the strength of the upper box body 11; the strength of the surface layer 32 is relatively high, so that the strength of the upper box body 11 is strengthened by the surface layer 32.

[0095] refer to Figure 4 , Figure 5 In some embodiments, the elastic modulus of the base layer 31 is less than or equal to the elastic modulus of the surface layer 32; the elastic modulus of the base layer 31 is greater than or equal to 800 MPa (megapascals), and the elastic modulus of the surface layer 32 is greater than or equal to 5000 MPa.

[0096] The elastic modulus of a material is a performance parameter used to measure the material's ability to resist elastic deformation energy. The larger the elastic modulus of a material, the greater the stress required for the material to undergo elastic deformation, that is, the greater the strength of the material, and the smaller the deformation of the material under a certain force.

[0097] The elastic modulus of a material can be measured by a tensile test, that is, a tensile force is applied to the material to deform the material and obtain a stress-strain curve, and the elastic modulus of the material can be obtained according to the slope of the neutral region of the linear stress-strain curve; the elastic modulus of a material can also be measured by a compression test, that is, a compressive force perpendicular to the surface of the material is applied to the material to deform the material and obtain a stress-strain curve, and the elastic modulus of the material can be obtained according to the slope of the neutral region of the linear stress-strain curve; the elastic modulus of a material can also be measured by a bending test, that is, the material is placed on a bracket and a force is applied to bend it, the deformation and stress after bending are measured, and the elastic modulus is obtained by analytical calculation; it can be understood that the elastic modulus of a material can also be measured by other methods, not limited to the above-mentioned ones.

[0098] The elastic modulus of the base layer 31 is greater than 800 MPa. For example, the elastic modulus of the base layer 31 may be 800 MPa, 850 MPa, 900 MPa, 950 MPa, 1000 MPa or other values.

[0099] The elastic modulus of the surface layer 32 is greater than 5000 MPa. For example, the elastic modulus of the surface layer 32 may be 5000 MPa, 6000 MPa, 7000 MPa, 8000 MPa, 9000 MPa, 10000 MPa or other values.

[0100] The elastic modulus of the base layer 31 can be smaller than the elastic modulus of the surface layer 32, so that the base layer 31 is more easily deformed by force than the surface layer 32, so that the base layer 31 can better absorb energy and transfer part of the force it receives to the surface layer 32; the elastic modulus of the surface layer 32 can be greater than the elastic modulus of the base layer 31, so that the surface layer 32 is less likely to be deformed by force, so that the surface layer 32 can better provide support for the upper box body 11, and also make it less likely for the surface layer 32 to deform and compress the battery cell 20 when the upper box body 11 is under force, so as to better protect the battery cell 20; the elastic modulus of the base layer 31 can also be equal to the elastic modulus of the surface layer 32, so that both the base layer 31 and the surface layer 32 can provide support for the upper box body 11.

[0101] For example, the elastic modulus of the base layer 31 can be 800 MPa, and the elastic modulus of the surface layer 32 can be 5000 MPa, so that the base layer 31 can be used to absorb part of the energy it receives and transmit part of the force it receives, and the surface layer 32 can better provide support for the upper box body 11; at the same time, under the premise of meeting the strength requirements, the elastic modulus of the base layer 31 and the surface layer 32 is not too high, so that the base layer 31 and the surface layer 32 are easier to process, reducing the processing difficulty, so as to improve the processing efficiency.

[0102] It can be understood that, when the strength of the base layer 31 meets the requirements, the elastic modulus of the base layer 31 can also be much larger than 800 MPa; when the strength of the surface layer 32 meets the requirements, the elastic modulus of the surface layer 32 can also be much larger than 5000 MPa.

[0103] In this embodiment, the elastic modulus of the base layer 31 is relatively small, while the elastic modulus of the surface layer 32 is relatively large, so that the base layer 31 can mainly play the role of absorbing energy and transmitting force, and the surface layer 32 can mainly play the role of strengthening the upper box body 11.

[0104] In some embodiments, the elastic modulus of the base layer 31 is greater than or equal to 1000 MPa, and the elastic modulus of the surface layer 32 is greater than or equal to 6000 MPa.

[0105] The elastic modulus of the base layer 31 is greater than 1000 MPa. For example, the elastic modulus of the base layer 31 may be 100 MPa, 1500 MPa, 2000 MPa, 2500 MPa, 3000 MPa or other values.

[0106] The elastic modulus of the surface layer 32 is greater than 5000 MPa. For example, the elastic modulus of the surface layer 32 may be 6000 MPa, 8000 MPa, 10000 MPa, 12000 MPa, 15000 MPa, 20000 MPa or other values.

[0107] For example, the elastic modulus of the base layer 31 can be 1000 MPa, and the elastic modulus of the surface layer 32 can be 6000 MPa, so that the base layer 31 can be used to absorb part of the energy it receives and transmit part of the force it receives. At the same time, this arrangement also enables the base layer 31 to better provide support for the upper box body 11, and also enables the surface layer 32 to better provide support for the upper box body 11.

[0108] This embodiment further provides some ranges of elastic moduli of the base layer 31 and the surface layer 32. On the premise that the base layer 31 can mainly play the role of energy absorption and force transmission, the base layer 31 and the surface layer 32 can also play the role of strengthening the upper box body.

[0109] refer to Figure 4 , Figure 5 In some embodiments, the thickness of the base layer 31 is greater than the thickness of the surface layer 32 .

[0110] The thickness of the base layer 31 refers to the size of the base layer 31 in the thickness direction of the structural member 30, and the thickness of the surface layer 32 refers to the size of the surface layer 32 in the thickness direction of the structural member 30; Figure 5 In the figure, the thickness of the base layer 31 is the size shown by h1, and the thickness of the surface layer 32 is the size shown by h2.

[0111] Since the base layer 31 is mainly used to absorb the energy it receives and to transmit force to the surface layer 32, the thickness of the base layer 31 is made larger so that the base layer 31 can better absorb energy. At the same time, this arrangement can also reduce the deformation of the base layer 31, so that the base layer 31 can deform to transmit force to the surface layer 32, but the deformation of the base layer 31 will not be too large, so as to reduce the situation where the surface layer 32 is subjected to excessive force and breaks.

[0112] Since the surface layer 32 is mainly used to provide support for the upper box body 11, when the strength of the surface layer 32 meets the requirements, the thickness of the surface layer 32 is made smaller to reduce the space occupied by the surface layer 32, thereby reducing the negative impact of the structural member 30 on the energy density of the battery 100; it can also reduce the weight of the structural member 30, thereby reducing the overall weight of the battery 100.

[0113] In this embodiment, the thickness of the base layer 31 is relatively thick, so that the base layer 31 can deform after being subjected to force, thereby facilitating the base layer 31 to absorb part of the energy it bears; the thickness of the surface layer 32 is relatively thin, and when the strength of the surface layer 32 meets the requirements, the space occupied by the surface layer 32 is reduced.

[0114] refer to Figure 4 , Figure 5 In some embodiments, the thickness of the base layer 31 ranges from 1.0 mm (millimeter) to 2.0 mm. Figure 5 In the figure, the thickness of the base layer 31 is the size shown in h1; for example, the thickness of the base layer 31 can be 1.0 mm, 1.2 mm, 1.0 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm or other values.

[0115] The thickness of the surface layer 32 ranges from 0.1 mm to 0.3 mm. Figure 5 In the figure, the thickness of the surface layer 32 is the size shown by h2; for example, the thickness of the surface layer 32 can be 0.10mm, 0.125mm, 0.15mm, 0.175mm, 0.2mm, 0.225mm, 0.25mm, 0.275mm, 0.3mm or other values.

[0116] For example, the thickness of the base layer 31 can be 1.0 mm, and the thickness of the surface layer 32 can be 0.1 mm. In this case, the thicknesses of the base layer 31 and the surface layer 32 are both relatively small. When the overall strength of the structural member 30 meets the requirements, this arrangement can reduce the occupation of the internal space of the box body 10 by the structural member 30, thereby reducing the negative impact of the structural member 30 on the energy density of the battery 100.

[0117] For example, the thickness of the base layer 31 can be 1.5 mm, and the thickness of the surface layer 32 can be 0.2 mm. At this time, the thickness of the base layer 31 and the surface layer 32 is moderate, so that the structural member 30 can provide support for the upper box body 11 to improve the strength of the upper box body 11, and can also reduce the occupation of the internal space of the box body 10 by the structural member 30.

[0118] For example, the thickness of the base layer 31 can be 2.0 mm, and the thickness of the surface layer 32 can be 0.3 mm. At this time, the thicknesses of the base layer 31 and the surface layer 32 are both relatively large, so that the structural member 30 can better provide support for the upper box body 11, thereby increasing the overall strength of the upper box body 11 and better providing protection for the battery cell 20.

[0119] This embodiment provides some thickness ranges for the base layer 31 and the surface layer 32 , wherein the base layer 31 is thicker and the surface layer 32 is thinner, so that the base layer 31 can mainly play the role of transmitting force and absorbing energy and reduce the space occupied by the surface layer 32 .

[0120] In some embodiments, the surface layer 32 is a fireproof material layer; the base layer 31 is an adhesive material layer to bond the surface layer 32 to the inner surface 111 .

[0121] The fireproof material layer refers to a structure with fireproof properties. The material of the fireproof material layer may include fireproof materials, such as calcium carbonate, magnesium and its compounds, mineral wool or other materials with fireproof properties.

[0122] The surface layer 32 is a fireproof material layer, so that the surface layer 32 can not only provide support for the upper box body 11 to enhance the strength of the upper box body 11, but also improve the fireproof performance of the upper box body 11; in the event of thermal runaway of the battery cell 20, this setting can reduce the spread of the flame inside the box body 10 to the outside of the box body 10.

[0123] The viscous material layer refers to a viscous structure, and the material of the viscous material layer may include a viscous material, for example, silicone, polyurethane, polyacrylic resin, epoxy resin or other viscous materials.

[0124] The base layer 31 is a sticky material layer so that the base layer 31 can adhere the surface layer 32 to the inner surface 111 of the upper box body 11 . At the same time, this setting also enables the base layer 31 to better absorb the energy it receives, thereby improving the strength of the upper box body 11 .

[0125] In this embodiment, the base layer 31 is a sticky material layer, so as to facilitate the connection of the surface layer 32 to the upper box body 11, and also facilitate the base layer 31 to absorb energy, thereby improving the strength of the upper box body 11; the surface layer 32 is a fireproof material layer, and when the strength of the surface layer 32 meets the requirements, the surface layer 32 can hinder the diffusion of heat in the case of thermal runaway of the battery 100, thereby reducing the negative impact of the thermal runaway of the battery 100 on the outside world.

[0126] In some embodiments, the material of the base layer 31 includes one of epoxy resin and rubber, and the material of the surface layer 32 includes one of glass fiber, polycarbonate and polyvinylidene fluoride resin.

[0127] The material of the base layer 31 may include epoxy resin, rubber or other materials, so that the base layer 31 can not only connect the surface layer 32 to the upper box body 11, but also absorb part of the energy it receives and transmit part of the force it receives. Among them, epoxy resin has excellent bonding properties and can adhere to a variety of materials; at the same time, epoxy resin also has high tensile, compressive and bending strengths after curing, and has a small shrinkage rate after curing, and has good insulation properties. Rubber has good bonding properties, and different formulas can be configured according to needs to bond to different materials; at the same time, rubber has excellent elasticity and good insulation properties.

[0128] It is understandable that the material of the base layer 31 may also include other materials, and is not limited to epoxy resin and rubber.

[0129] The material of the surface layer 32 may include glass fiber, polycarbonate, polyvinylidene fluoride resin or other materials, so that the surface layer 32 has higher strength. Among them, glass fiber has higher tensile strength and elastic modulus, better insulation performance, lower density, and is easy to process. Polycarbonate has higher strength, rigidity and toughness, better insulation performance, and is easy to process. Polyvinylidene fluoride resin has higher tensile strength and compressive strength, better toughness, better insulation performance, better non-flammability and self-extinguishing properties, and is easy to process.

[0130] It is understandable that the material of the surface layer 32 may also include other materials, and is not limited to glass fiber, polycarbonate, and polyvinylidene fluoride resin.

[0131] This embodiment provides some specific materials for the base layer 31 and the surface layer 32 so that the base layer 31 can mainly play the role of energy absorption and bonding, and the surface layer 32 can mainly play the role of strengthening the upper box body 11 and fire prevention.

[0132] In some embodiments, the battery cell 20 includes a pressure relief structure 24 ; in the height direction of the box body 10 , the projection of the pressure relief structure 24 on the inner surface 111 is located in the projection of the structural member 30 on the inner surface 111 .

[0133] The pressure relief structure 24 refers to a structure used to release the internal pressure when the internal pressure or temperature of the shell 21 of the battery cell 20 reaches a threshold value. The pressure relief structure 24 may include a pressure relief valve, a pressure relief film or other pressure relief structures 24; only one pressure relief structure 24 may be set on a battery cell 20, or two or more pressure relief structures 24 may be set; the pressure relief structure 24 may be set on the end cover 22, or at other positions of the battery cell 20.

[0134] In the height direction Z of the box body 10 , the projection of the pressure relief structure 24 on the inner surface 111 is located in the projection of the structural member 30 on the inner surface 111 , that is, the structural member 30 can cover the pressure relief structure 24 in the height direction Z of the box body 10 .

[0135] In the event of thermal runaway of the battery cell 20, high-temperature and high-pressure flue gas will enter the internal space of the box body 10 outside the shell 21 through the pressure relief structure 24, and the high-temperature and high-pressure flue gas will move upward; at this time, the structural member 30 can separate the high-temperature and high-pressure flue gas from the upper box body 11, thereby reducing the damage of the high-temperature and high-pressure flue gas to the upper box body 11, and at the same time can also hinder the temperature from being transmitted to the upper box body 11, thereby reducing the temperature of the upper box body 11 and reducing the negative impact on the outside world.

[0136] When the pressure relief structure 24 is located on the end cover 22, the high-temperature and high-pressure flue gas generated by the thermal runaway of the battery cell 20 is likely to directly impact the upper box body 11; at this time, the structural member 30 can withstand the impact of the high-temperature and high-pressure flue gas, thereby alleviating the deformation of the upper box body 11 under the impact of the high-temperature and high-pressure flue gas.

[0137] In this embodiment, in the height direction of the battery 100, the structural member 30 is located above the pressure relief structure 24 of the battery cell 20. In the event of thermal runaway of the battery cell 20, the high-temperature and high-pressure flue gas ejected from the pressure relief structure 24 can first contact the structural member 30, thereby reducing the damage of the high-temperature and high-pressure flue gas to the upper box body 11, alleviating the impact force transmitted to the external environment of the battery 100, and reducing the temperature transmitted to the external environment of the battery 100.

[0138] refer to Figures 6 to 8 In some embodiments, the upper box body 11 is provided with ribs 112 protruding in the direction toward the inner surface 111 ; in the height direction of the box body 10 , the projection of the structural member 30 on the inner surface 111 is staggered with the projection of the ribs 112 on the inner surface 111 .

[0139] The rib 112 refers to a structure in the upper box body 11 that protrudes from the inner surface 111. Since the inner surface 111 is located on the side of the upper box body 11 facing the battery cell 20, the rib 112 protrudes from the inner surface 111 toward the direction where the battery cell 20 is located; when the upper box body 11 is located above the battery cell 20, the rib 112 protrudes downward from the inner surface 111.

[0140] The cross-sectional shape of the rib 112 along its radial direction may include a semicircular, square, trapezoidal or other shapes; there may be one rib 112, or there may be two or more ribs 112; the rib 112 may be fixedly connected to the upper box body 11 by welding, bonding or other means, or may be detachably connected to the upper box body 11 by snap-on, screw-on or other means, and the rib 112 may also be integrally formed with the upper box body 11; according to the formation method of the rib 112, a groove opposite to the rib 112 may be provided on the other side of the upper box body 11 opposite to the inner surface 111, and the side of the upper box body 11 opposite to the inner surface 111 may also be a plane; the material of the rib 112 may include metal, plastic or other materials, and according to the formation method of the rib 112, the material of the rib 112 may be the same as or different from the material of the upper box body 11.

[0141] In the height direction Z of the box body 10, the projection of the structural member 30 on the inner surface 111 is staggered from the projection of the rib 112 on the inner surface 111, that is, the rib 112 and the structural member 30 are located at different positions on the inner surface 111, and the structural member 30 does not cover the rib 112. Since both the rib 112 and the structural member 30 are structures protruding from the inner surface 111, this arrangement can prevent the rib 112 and the structural member 30 from overlapping in the height direction Z of the box body 10, so as to reduce the overall thickness of the upper box body 11, thereby reducing the negative impact of the structural member 30 and the rib 112 on the energy density of the battery 100; at the same time, it is also convenient for the installation of the structural member 30.

[0142] In this embodiment, the structural member 30 is staggered with the rib 112. When the structural member 30 is arranged on the upper box body 11, this arrangement can reduce the thickness of the upper box body 11 at the rib 112, thereby reducing the overall thickness of the upper box body 11 and reducing the space occupied by the upper box body 11.

[0143] In some embodiments, the upper box body 11 is made of metal material through a stamping process; or the upper box body 11 includes a profile.

[0144] The stamping process is a processing technology that uses molds and stamping equipment to apply pressure to materials to cause plastic deformation of the materials to obtain a certain shape, size and performance; the upper box body 11 is formed by a metal material through a stamping process, so as to improve the strength of the upper box body 11 by adjusting the processing technology; because the current upper box body 11 is mostly a sheet metal structure or a plastic structure, this setting can increase the strength of the upper box body 11.

[0145] A profile refers to a structure formed by plastic processing of metal and having a certain cross-sectional shape and size. The cross-section of the profile can be a solid structure or a hollow structure; the upper box body 11 can include one profile or multiple profiles.

[0146] According to the shape of the profile cross section, the upper box body 11 generally has good strength and energy absorption performance; since the current upper box body 11 is mostly a sheet metal structure or a plastic structure, this setting can increase the strength of the upper box body 11.

[0147] This embodiment provides some structures of the upper box body 11 so that the upper box body 11 can have higher strength.

[0148] refer to Figure 6 , Fig. 9 In some embodiments, a beam body 121 is provided in the lower box body 12, and the beam body 121 divides the accommodating cavity 101 into at least a first cavity 122 and a second cavity 123, and the battery cell 20 is accommodated in the first cavity 122; in the height direction of the box body 10, the projection of the second cavity 123 on the inner surface 111 is staggered with the projection of the structural member 30 on the inner surface 111.

[0149] The beam body 121 refers to a beam structure arranged on the lower box body 12. The beam body 121 can be an expansion beam of the battery 100 or other beam structures. The number of beam bodies 121 can be one or two or more. The beam body 121 can be fixedly connected to the lower box body 12 by welding, bonding or other means, or can be detachably connected to the lower box body 12 by screwing, clamping or other means. The material of the beam body 121 can include metal, plastic or other materials.

[0150] The beam body 121 can separate the accommodating cavity 101 into at least a first cavity 122 and a second cavity 123, that is, the beam body 121 can only separate the accommodating cavity 101 into the first cavity 122 and the second cavity 123, and can also separate other cavities; wherein the first cavity 122 is used to accommodate the battery cell 20, and the second cavity 123 can also accommodate other electrical structures of the battery 100, and can also accommodate other structures.

[0151] In the height direction Z of the box body 10, the projection of the second cavity 123 on the inner surface 111 is staggered with the projection of the structural member 30 on the inner surface 111, that is, the structural member 30 is staggered with the second cavity 123 in the height direction Z of the box body 10, and does not extend above the second cavity 123, so that the structural member 30 can be mainly opposite to the battery cell 20; because the structural member 30 is mainly used to increase the strength of the upper box body 11 to better protect the battery cell 20, this arrangement can reduce the overall volume of the structural member 30 while meeting the demand for protecting the battery cell 20, so as to reduce the weight and space occupied by the structural member 30.

[0152] In this embodiment, the structural member 30 is mainly opposite to the battery cells 20 in the box body 10, and the structural member 30 is not easily extended to other positions of the upper box body 11, so that the structural member 30 can not only play a role in strengthening the strength of the upper box body 11, but also reduce the overall size of the structural member 30, reduce the space occupied by the structural member 30, reduce the overall weight of the upper box body 11, and reduce the cost of the structural member 30.

[0153] refer to Figures 6 to 8 In some embodiments, the base layer 31 is protruded from the inner surface 111 toward the direction close to the battery cell 20 .

[0154] Because the base layer 31 is connected to the inner surface 111 , the base layer 31 is protruded from the inner surface 111 toward the direction close to the battery cell 20 , that is, the structural member 30 is protruded from the inner surface 111 toward the direction close to the battery cell 20 .

[0155] Compared with the method of embedding the structural member 30 in the upper box body 11, protruding the structural member 30 on the inner surface 111 can make the overall thickness of the upper box body 11 at the structural member 30 thicker, thereby better enhancing the strength of the upper box body 11 and reducing the difficulty of installing the structural member 30.

[0156] In some embodiments, the battery 100 includes a battery cell 20 and a case 10 , the case 10 includes an upper case 11 and a lower case 12 covering each other, the upper case 11 and the lower case 12 enclose a receiving cavity 101 , and the battery cell 20 is received in the receiving cavity 101 .

[0157] A structural member 30 is provided on one side of the upper box body 11 facing the accommodating cavity 101 , which is disposed above the battery cell 20 and opposite to the pressure relief structure 24 of the battery cell 20 ; meanwhile, the structural member 30 and the ribs 112 of the upper box body 11 are arranged alternately.

[0158] The structural member 30 includes a base layer 31 and a surface layer 32 which are stacked, wherein the base layer 31 is connected to the upper box body 11, and the surface layer 32 is connected to the base layer 31; the base layer 31 is a viscous material layer, and the surface layer 32 is a fireproof material layer; the thickness of the base layer 31 is greater than the thickness of the surface layer 32, and the elastic modulus of the base layer 31 is less than the elastic modulus of the surface layer 32.

[0159] In a second aspect, some embodiments of the present application further provide an electrical device, comprising the battery 100 provided in some embodiments of the first aspect.

[0160] Under the action of the structural member 30 , the upper case 11 of the battery 100 has a high strength, thereby reducing the possibility that the upper case 11 is deformed or damaged by the external environment and thus damages the battery cell 20 .

[0161] Taking the electrical device as a vehicle 1000 as an example, under the action of the structural member 30, impurities such as gravel generated during the driving of the vehicle 1000 will not easily collide with the upper box body 11, causing deformation of the upper box body 11 or penetrate the upper box body 11. Even if the upper box body 11 is damaged, the structural member 30 can still protect the battery cells 20.

[0162] 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, characterized in that: include: Battery cells; A box body, comprising a lower box body and an upper box body covering the lower box body, wherein the upper box body and the lower box body define a receiving cavity for receiving the battery monomer, and the upper box body comprises an inner surface facing the receiving cavity; as well as A structural member is used to improve the strength of the box body, the structural member includes a base layer and a surface layer connected to the base layer, the base layer is connected to the inner surface, and the surface layer is arranged on a side of the structural member facing the accommodating cavity.

2. The battery according to claim 1, characterized in that The strength of the base layer is less than or equal to the strength of the surface layer.

3. The battery according to claim 2, characterized in that The elastic modulus of the base layer is less than or equal to the elastic modulus of the surface layer; The elastic modulus of the base layer is greater than or equal to 800 MPa, and the elastic modulus of the surface layer is greater than or equal to 5000 MPa.

4. The battery according to claim 3, characterized in that The elastic modulus of the base layer is greater than or equal to 1000 MPa, and the elastic modulus of the surface layer is greater than or equal to 6000 MPa.

5. The battery according to any one of claims 1 to 3, characterized in that The thickness of the base layer is greater than the thickness of the surface layer.

6. The battery according to claim 5, characterized in that The thickness of the base layer ranges from 1.0 mm to 2.0 mm, and the thickness of the surface layer ranges from 0.1 mm to 0.3 mm.

7. The battery according to any one of claims 1 to 4, characterized in that The surface layer is a fireproof material layer; The base layer is a layer of adhesive material to bond the surface layer to the inner surface.

8. The battery according to claim 7, characterized in that The material of the base layer includes one of epoxy resin and rubber, and the material of the surface layer includes one of glass fiber, polycarbonate and polyvinylidene fluoride resin.

9. The battery according to any one of claims 1 to 4, characterized in that The battery cell includes a pressure relief structure; In the height direction of the box body, the projection of the pressure relief structure on the inner surface is located in the projection of the structural member on the inner surface.

10. The battery according to any one of claims 1 to 4, characterized in that The upper box body is provided with ribs protruding in the direction toward the inner surface; In the height direction of the box body, a projection of the structural member on the inner surface is staggered from a projection of the rib on the inner surface.

11. The battery according to any one of claims 1 to 4, characterized in that: The upper box body is made of metal material through a stamping process; or The upper box body comprises a profile.

12. The battery according to any one of claims 1 to 4, characterized in that A beam body is provided in the lower box body, and the beam body divides the accommodation cavity into at least a first cavity and a second cavity, and the battery cell is accommodated in the first cavity; In the height direction of the box body, a projection of the second cavity on the inner surface is staggered from a projection of the structural member on the inner surface.

13. The battery according to any one of claims 1 to 4, characterized in that The base layer is protruded from the inner surface toward a direction close to the battery cell.

14. An electrical device, characterized in that: Comprising the battery according to any one of claims 1 to 13.

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