Battery device, bottom protection plate and electric equipment

Abstract

The utility model discloses a battery device, a bottom protection plate and electric equipment.The battery device comprises a battery monomer and a battery box body with a containing space, the containing space is used for containing the battery monomer, the battery box body at least comprises the bottom protection plate, and the bottom protection plate comprises a plate body, a carbon fiber layer and a polyurea layer; the carbon fiber layer is arranged on the surface, facing the accommodating space, of the plate body, and the polyurea layer is arranged on the surface, back to the accommodating space, of the plate body, so that the structural strength, impact resistance and toughness of the bottom protection plate can be improved, the risk of deformation of the bottom protection plate when the bottom protection plate is impacted or extruded is reduced, and the reliability of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery device, a bottom guard plate, and an electrical equipment. Background Art

[0002] The battery device of a new energy vehicle is usually arranged at the bottom of the vehicle to play roles such as reducing the center of gravity of the vehicle and balancing the front and rear weights of the vehicle. However, during the driving process of the vehicle, due to the uncertainty of road conditions, the bottom of the battery box of the battery device is prone to be impacted or squeezed. In order to enhance the protection effect on the battery device, the bottom guard plate emerges as the times require.

[0003] In the related art, ribs are usually arranged on the surface of the bottom guard plate in a criss-cross pattern to enhance the structural strength of the bottom guard plate. However, the overall strength of such a structure is not high, resulting in the bottom guard plate being prone to deformation when impacted or squeezed, affecting the reliability of the battery device. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery device, a bottom guard plate, and an electrical equipment to enhance the structural strength, impact resistance, and toughness of the bottom guard plate, reduce the risk of deformation of the bottom guard plate when impacted or squeezed, and thus improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device. The battery device includes battery cells and a battery box forming an accommodation space for accommodating the battery cells. The battery box includes at least a bottom guard plate, and the bottom guard plate includes: a plate body; a carbon fiber layer provided on the surface of the plate body facing the accommodation space; and a polyurea layer provided on the surface of the plate body facing away from the accommodation space. By providing a carbon fiber layer on the surface of the plate body facing the accommodation space and a polyurea layer on the surface of the plate body facing away from the accommodation space, the carbon fiber layer can absorb and disperse the energy generated when the bottom guard plate is squeezed, thereby playing a role in relieving stress concentration, enabling the bottom guard plate to better resist deformation when squeezed, and thus improving the toughness of the bottom guard plate; the plate body can enhance the strength of the bottom guard plate, thereby improving its impact resistance; there are a large number of hydrogen bonds between the polyurea molecular chains of the polyurea layer, and the hydrogen bonds enhance the interaction between polyurea molecules, which can improve the overall mechanical properties of the polyurea layer, enabling the polyurea layer to resist external extrusion and impact, and thus further improving the structural strength and impact resistance of the bottom guard plate; at the same time, the carbon fiber layer is provided on the surface of the plate body facing the accommodation space, and the plate body and the polyurea layer can reduce the influence of external impact on the carbon fiber layer, thereby reducing the risk of damage to the carbon fiber layer by external impact; the arrangement of the carbon fiber layer, the plate body, and the polyurea layer can take into account improving the structural strength, impact resistance, toughness, and anti-extrusion performance of the bottom guard plate, and can reduce the risk of deformation of the bottom guard plate when impacted or squeezed, and thus can improve the reliability of the battery device.

[0006] In some embodiments, the thickness of the carbon fiber layer is 0.9 mm to 1.1 mm. By making the thickness of the carbon fiber layer within the range of 0.9 mm to 1.1 mm, on the one hand, the carbon fiber layer can exert its excellent corrosion resistance, and can significantly improve the toughness of the bottom guard plate, making the bottom guard plate not easy to be corroded and deformed, and can improve the supporting ability and protection effect of the bottom guard plate on the battery cell; on the other hand, the weight of the carbon fiber layer is relatively light, which can improve the energy utilization efficiency and endurance of the battery device. When the bottom guard plate is used in the battery device of a vehicle, it can also reduce the impact of the weight of the bottom guard plate on the energy consumption, endurance and other aspects of the vehicle.

[0007] In some embodiments, the thickness of the plate body is 0.4 mm to 1.6 mm. By making the thickness of the plate body within the range of 0.4 mm to 1.6 mm, on the one hand, the bottom guard plate has sufficient strength and hardness and is not easy to be deformed or broken, and can improve the supporting ability and protection effect of the bottom guard plate on the battery cell; on the other hand, the weight of the bottom guard plate is relatively light. When the bottom guard plate is used in the battery device of a vehicle, it can reduce the impact of the weight of the bottom guard plate on the energy consumption, endurance and other aspects of the vehicle.

[0008] In some embodiments, the thickness of the polyurea layer is 0.3 mm to 3 mm. By making the thickness of the polyurea layer within the range of 0.3 mm to 3 mm, on the one hand, the polyurea layer can exert its excellent corrosion resistance, high temperature resistance, wear resistance and impact resistance and other properties, so that the polyurea layer can play a better protection effect on the plate body, and on the other hand, it can save the usage amount of the polyurea layer and reduce the cost.

[0009] In some embodiments, the plate body includes a steel plate, and the bottom guard plate further includes a first connection layer. The first connection layer is arranged between the carbon fiber layer and the steel plate, and the polyurea layer is arranged on the surface of the steel plate facing away from the carbon fiber layer. By arranging the first connection layer between the carbon fiber layer and the steel plate, the carbon fiber layer and the steel plate can be integrated, the overall performance of the bottom guard plate can be enhanced, the overall strength and toughness of the bottom guard plate are significantly improved, and at the same time, the bottom guard plate can maintain good stability during use, reducing the risk of separation between the carbon fiber layer and the steel plate, and can further improve the reliability of the battery device.

[0010] In some embodiments, the carbon fiber layer includes multiple layers of carbon fiber sub-layers arranged in a stacked manner and a second connection layer disposed between two adjacent carbon fiber sub-layers. Since the carbon fiber layer includes multiple layers of carbon fiber sub-layers, the multiple layers of carbon fiber sub-layers can improve the toughness, fatigue resistance, and shock absorption performance of the carbon fiber layer; by providing a second connection layer between two adjacent carbon fiber sub-layers, the multiple layers of carbon fiber sub-layers can form a tight composite structure, and this tight composite structure enables the carbon fiber layer to absorb more energy when subjected to external forces, thereby further enhancing the toughness, fatigue resistance, and shock absorption performance of the carbon fiber layer.

[0011] In some embodiments, the thickness of the carbon fiber sub-layer is 0.1 mm to 0.3 mm. By making the thickness of the carbon fiber sub-layer within the range of 0.1 mm to 0.3 mm, the mutual interference between the fibers in the carbon fiber sub-layer can be reduced, the distribution of the fibers can be made more uniform, which is beneficial to improving the toughness of the carbon fiber sub-layer, reducing or eliminating the risk of deformation of the carbon fiber sub-layer when being squeezed, and thus the reliability of the bottom guard plate can be improved.

[0012] In some embodiments, the laying angles of at least two adjacent carbon fiber sub-layers are different. By making the laying angles of at least two adjacent carbon fiber sub-layers different, when the bottom guard plate is subjected to extrusion or impact, it can better absorb and disperse the energy generated when the bottom guard plate is impacted or extruded, thereby playing a role in relieving stress concentration, enabling the bottom guard plate to better resist deformation, and at the same time, it can also relieve the vibration generated when the bottom guard plate is impacted or extruded, thereby improving the vibration isolation performance of the bottom guard plate.

[0013] In some embodiments, the carbon fiber layer includes two carbon fiber sub-layers, the laying angle of one carbon fiber sub-layer is +45°, and the laying angle of the other carbon fiber sub-layer is -45°. By making the laying angle of one carbon fiber sub-layer in the two carbon fiber sub-layers be +45° and the laying angle of the other carbon fiber sub-layer be -45°, when the bottom guard plate is subjected to extrusion or impact, the two carbon fiber sub-layers can work together, having the ability to resist the tensile force and shear force generated by multi-directional extrusion or impact, and can enhance the tensile resistance and shear resistance of the carbon fiber layer, thereby improving the toughness of the bottom guard plate.

[0014] In some embodiments, the material of the first connection layer is epoxy resin, polyimide resin, bismaleimide resin or phenolic resin, and the material of the second connection layer is epoxy resin, polyimide resin, bismaleimide resin or phenolic resin. Epoxy resin, polyimide resin, bismaleimide resin and phenolic resin can crosslink and polycondense during the curing process to form a crosslinked structure, which can fill the gaps between the carbon fiber layer and the plate body, between adjacent carbon fiber sub-layers and inside the carbon fiber sub-layers, so that the plate body and the multi-layer carbon fiber sub-layers form an integral body, which can not only improve the connection strength between the carbon fiber sub-layers and the connection strength between the carbon fiber layer and the plate body, but also enhance the overall structural strength and toughness of the carbon fiber layer.

[0015] In some embodiments, the bottom guard plate further includes a first coating layer and a second coating layer. The first coating layer is disposed between the plate body and the carbon fiber layer, and the second coating layer is disposed between the plate body and the polyurea layer. By disposing the first coating layer between the plate body and the carbon fiber layer and the second coating layer between the plate body and the polyurea layer, substances such as liquid can be blocked from contacting the plate body, reducing the risk of corrosion of the plate body.

[0016] In some embodiments, the first coating layer includes a galvanized layer or a galvanized magnesium aluminum layer, and the second coating layer includes a galvanized layer or a galvanized magnesium aluminum layer. The setting of the galvanized layer or the galvanized magnesium aluminum layer can effectively improve the corrosion resistance of the overall bottom guard plate.

[0017] In some embodiments, the battery box further includes a frame, and the frame is connected to the outer peripheral area of the bottom guard plate to form a receiving space with the bottom guard plate. By connecting the frame to the outer peripheral area of the bottom guard plate to form a receiving space with the bottom guard plate, the bottom guard plate can serve as the bottom wall of the battery box, which can improve the structural strength, impact resistance and toughness of the bottom wall of the battery box, and reduce the risk of deformation of the bottom wall of the battery box when it is impacted or squeezed, thereby improving the reliability of the battery device.

[0018] In some embodiments, the battery box further includes a frame and a bottom shell. The frame is connected to the outer peripheral area of the bottom shell to form a receiving space with the bottom shell, and the bottom guard plate is disposed on the side of the bottom shell facing away from the receiving space. By disposing the bottom guard plate on the side of the bottom shell facing away from the receiving space, the structural strength, impact resistance and toughness of the bottom shell of the battery box can be improved, and the risk of deformation of the bottom shell of the battery box when it is impacted or squeezed can be reduced, thereby improving the reliability of the battery device.

[0019] In a second aspect, the present application also provides a bottom guard plate, which includes: a plate body; a carbon fiber layer provided on one side surface of the plate body; and a polyurea layer provided on the surface of the plate body facing away from the carbon fiber layer. By providing a carbon fiber layer on one side surface of the plate body and a polyurea layer on the surface of the plate body facing away from the carbon fiber layer, the carbon fiber layer can absorb and disperse the energy generated when the bottom guard plate is squeezed, thereby playing a role in alleviating stress concentration, enabling the bottom guard plate to better resist deformation when being squeezed, and thus improving the toughness of the bottom guard plate; the plate body can enhance the strength of the bottom guard plate, thereby improving its impact resistance; there are a large number of hydrogen bonds between the polyurea molecular chains of the polyurea layer, and the hydrogen bonds enhance the interaction between the polyurea molecules, which can improve the overall mechanical properties of the polyurea layer, enabling the polyurea layer to resist external squeezing and impact, and thus further improving the structural strength and impact resistance of the bottom guard plate; at the same time, the carbon fiber layer is provided on the surface of the plate body facing the accommodation space, and the plate body and the polyurea layer can reduce the influence of external impact on the carbon fiber layer, thereby reducing the risk of damage to the carbon fiber layer by external impact; the arrangement of the carbon fiber layer, the plate body and the polyurea layer can take into account the improvement of the structural strength, impact resistance, toughness and extrusion resistance of the bottom guard plate, and can reduce the risk of deformation of the bottom guard plate when being impacted or squeezed, and thus improve the reliability of the battery device.

[0020] In some embodiments, the plate body includes a steel plate, and the bottom guard plate further includes a first connection layer provided between the carbon fiber layer and the steel plate, and the polyurea layer is provided on the surface of the steel plate facing away from the carbon fiber layer. By providing a first connection layer between the carbon fiber layer and the steel plate, the carbon fiber layer and the steel plate can form an integral body, which can enhance the overall performance of the bottom guard plate, significantly improve the overall strength and toughness of the bottom guard plate, and at the same time enable the bottom guard plate to maintain good stability during use, reduce the risk of separation between the carbon fiber layer and the steel plate, and further improve the reliability of the battery device.

[0021] In some embodiments, the carbon fiber layer includes a plurality of carbon fiber sub-layers stacked and a second connection layer provided between two adjacent carbon fiber sub-layers. Since the carbon fiber layer includes a plurality of carbon fiber sub-layers, the plurality of carbon fiber sub-layers can improve the toughness, fatigue resistance and shock absorption performance of the carbon fiber layer; by providing a second connection layer between two adjacent carbon fiber sub-layers, the multiple carbon fiber sub-layers can form a tight composite structure, and this tight composite structure enables the carbon fiber layer to absorb more energy when being subjected to external force, thereby further enhancing the toughness, fatigue resistance and shock absorption performance of the carbon fiber layer.

[0022] Third aspect, the present application also provides an electrical device, which includes: the above battery device, or the above bottom guard plate. By providing a carbon fiber layer on the surface of the plate body facing the accommodation space and a polyurea layer on the surface of the plate body facing away from the accommodation space, the carbon fiber layer can absorb and disperse the energy generated when the bottom guard plate is squeezed, thus playing a role in relieving stress concentration, enabling the bottom guard plate to better resist deformation when being squeezed, and therefore improving the toughness of the bottom guard plate; the plate body can enhance the strength of the bottom guard plate, thereby improving its impact resistance; there are a large number of hydrogen bonds between the polyurea molecular chains of the polyurea layer, and the hydrogen bonds enhance the interaction between polyurea molecules, which can improve the overall mechanical properties of the polyurea layer, enabling the polyurea layer to resist external extrusion and impact, and thus further improving the structural strength and impact resistance of the bottom guard plate; at the same time, the carbon fiber layer is provided on the surface of the plate body facing the accommodation space, and the plate body and the polyurea layer can reduce the impact of the outside world on the carbon fiber layer, thereby reducing the risk of the outside world damaging the carbon fiber layer; the setting of the carbon fiber layer, the plate body and the polyurea layer can take into account the improvement of the structural strength, impact resistance, toughness and extrusion resistance of the bottom guard plate, and can reduce the risk of deformation of the bottom guard plate when being impacted or squeezed, so the reliability of the battery device can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0024] Figure 1 is a schematic structural diagram of an embodiment of the electrical device provided by the present application;

[0025] Figure 2 is a schematic structural diagram of an embodiment of the battery device provided by the present application;

[0026] Figure 3 is an exploded structural diagram of an embodiment of the battery device provided by the present application;

[0027] Figure 4 is Figure 3 the enlarged view of part A in

[0028] Figure 5 is a schematic structural diagram of the first embodiment of the bottom guard plate of the battery device provided by the present application;

[0029] Figure 6 is a schematic structural diagram of the second embodiment of the bottom guard plate of the battery device provided by the present application;

[0030] Figure 7It is a schematic structural diagram of a carbon fiber layer of a bottom protection plate of a battery device provided by this application;

[0031] Figure 8 It is a schematic structural diagram of a third embodiment of the bottom protection plate of the battery device provided by this application;

[0032] Figure 9 It is a schematic structural diagram of a fourth embodiment of the bottom protection plate of the battery device provided by this application;

[0033] Figure 10 It is a schematic cross-sectional structural diagram of an embodiment of the battery device provided by this application;

[0034] Figure 11 It is a schematic cross-sectional structural diagram of another embodiment of the battery device provided by this application.

[0035] The reference numerals in the drawings in the specific embodiments are as follows:

[0036] Vehicle 1000a, battery device 100a, controller 200a, motor 300a, battery cell 10, housing 11, end cover 12, battery box 20, bottom protection plate 21, plate body 211, carbon fiber layer 212, carbon fiber sub-layer 2121, second connection layer 2122, polyurea layer 213, first connection layer 214, first coating layer 215, second coating layer 216, frame 22, first part 22a, second part 22b, first side wall 221, second side wall 222, third side wall 223, fourth side wall 224, bottom shell 23, mounting hole 21a, fixing member 30, first direction X-X, second direction Y-Y. Specific embodiments

[0037] The embodiments of the technical solutions of this application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0039] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate heat exchange medium, and it can be the communication inside 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 specific circumstances.

[0044] With the development of battery device technology, battery devices are applied in more and more fields and gradually replace traditional petrochemical energy in fields such as automotive power. A battery device refers to a physical module including one or more battery cells to provide higher voltage and capacity. The battery device includes a battery box for encapsulating one or more battery cells. The battery box includes a bottom guard plate, and the bottom guard plate can provide physical protection for the battery device. Especially during vehicle driving, it can reduce or eliminate the damage to the battery device when the bottom of the battery box of the battery device is impacted or squeezed.

[0045] In related technologies, usually criss-cross ribs are arranged on the surface of the bottom guard plate to improve the structural strength of the bottom guard plate. However, the overall strength of such a structure is not high, resulting in the bottom guard plate being prone to deformation when impacted or squeezed, affecting the reliability of the battery device.

[0046] Based on the above considerations, the present application provides a battery device, a bottom guard plate and an electrical equipment. Among them, the battery device includes battery cells and a battery box forming an accommodation space for accommodating the battery cells. The battery box at least includes a bottom guard plate. The bottom guard plate includes a plate body, a carbon fiber layer and a polyurea layer. The carbon fiber layer is arranged on the surface of the plate body facing the accommodation space, and the polyurea layer is arranged on the surface of the plate body facing away from the accommodation space. By arranging the carbon fiber layer on the surface of the plate body facing the accommodation space and the polyurea layer on the surface of the plate body facing away from the accommodation space, the carbon fiber layer can absorb and disperse the energy generated when the bottom guard plate is squeezed, thus playing a role in relieving stress concentration, enabling the bottom guard plate to better resist deformation when squeezed, and therefore improving the toughness of the bottom guard plate; the plate body can improve the strength of the bottom guard plate, thereby enhancing its impact resistance; there are a large number of hydrogen bonds between the polyurea molecular chains of the polyurea layer, and the hydrogen bonds enhance the interaction between polyurea molecules, capable of improving the overall mechanical properties of the polyurea layer, enabling the polyurea layer to resist external extrusion and impact, and thus further improving the structural strength and impact resistance of the bottom guard plate; at the same time, the carbon fiber layer is arranged on the surface of the plate body facing the accommodation space, and the plate body and the polyurea layer can reduce the influence of external impact on the carbon fiber layer, thereby reducing the risk of external impact damaging the carbon fiber layer; the arrangement of the carbon fiber layer, the plate body and the polyurea layer can take into account improving the structural strength, impact resistance, toughness and extrusion resistance of the bottom guard plate, reducing the risk of deformation of the bottom guard plate when impacted or squeezed, and thus improving the reliability of the battery device.

[0047] The battery device, bottom guard plate, and electrical equipment disclosed in the embodiments of the present application can be used in electrical equipment that uses the battery device as a power source or various energy storage systems that use the battery device as an energy storage element. The electrical equipment can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0048] For the convenience of description in the following embodiments, a vehicle 1000a, which is an electrical equipment in an embodiment of the present application, is taken as an example for illustration.

[0049] Please refer to Figure 1 , the vehicle 1000a can be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, or the like. A battery device 100a is disposed inside the vehicle 1000a, and the battery device 100a can be disposed at the bottom of the vehicle 1000a. The battery device 100a can be used for power supply of the vehicle 1000a. For example, the battery device 100a can be used as the operating power source of the vehicle 1000a. The vehicle 1000a can also include a controller 200a and a motor 300a. The controller 200a is used to control the battery device 100a to supply power to the motor 300a, for example, for the working power requirements during the start, navigation, and driving of the vehicle 1000a.

[0050] In some embodiments of the present application, the battery device 100a can not only be used as the operating power source of the vehicle 1000a, but also be used as the driving power source of the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0051] In some embodiments, the battery device 100a can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0052] Please refer to Figures 2 to 3 , the battery device 100a mentioned in the embodiments of the present application may include one or more battery cells 10 for providing voltage and capacity. The battery cell 10 may include a plurality of battery cells 10, and the plurality of battery cells 10 are connected in series, parallel, or in a hybrid connection through a busbar component.

[0053] In the embodiments of the present application, the battery cell 10 can be a secondary battery, which refers to a battery cell 10 that can be activated by charging after discharging to continue to be used.

[0054] The battery cell 10 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0055] In some embodiments, the battery device 100a includes a battery cell 10 and a battery box 20 formed with an accommodation space for accommodating the battery cell 10.

[0056] In some embodiments, the battery box 20 can be a part of the chassis structure of the vehicle 1000a. For example, a part of the battery box 20 can be at least a part of the chassis of the vehicle 1000a, or a part of the battery box 20 can be at least a part of the cross beam and longitudinal beam of the vehicle 1000a.

[0057] In some embodiments, at least a part of the battery box 20 can be disposed on the chassis structure of the vehicle 1000a.

[0058] In some embodiments, the battery box 20 at least includes a bottom guard plate 21. The bottom guard plate 21 can serve as the bottom wall of the battery box 20. The bottom guard plate 21 can not only be used to support the battery cell 10, but also reduce the damage to the battery device 100a caused when the bottom of the battery box 20 is impacted or squeezed.

[0059] In some other embodiments, the bottom guard plate 21 can be a component independent of the battery box 20, disposed close to the bottom wall of the battery box 20, and on the side of the bottom wall facing away from the accommodation space to support and protect the entire battery box 20.

[0060] The battery cell 10 includes an electrode assembly. The electrode assembly is mainly formed by winding or laminating a positive electrode plate, a negative electrode plate, and a separator, wherein the separator is disposed between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate having active substances constitute the main body part of the electrode assembly, the part of the positive electrode plate without active substances constitutes the positive electrode tab, and the part of the negative electrode plate without active substances constitutes the negative electrode tab. During the charging and discharging process of the battery device 100a, the positive active substance and the negative active substance react with the electrolyte to form a current loop.

[0061] The battery cell 10 further includes a housing 11 and an end cap 12. The housing 11 is a component for accommodating the electrode assembly. The housing 11 can be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at opposite ends. The housing 11 can be of various shapes, such as cylindrical, cuboid, etc. The material of the housing 11 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The end cap 12 is a component for closing the opening to isolate the internal environment of the battery cell 10 from the external environment. The end cap 12 and the housing 11 jointly define a receiving space for accommodating the electrode assembly, electrolyte and other components. The end cap 12 can be connected to the housing 11 by welding or crimping to close the opening of the housing 11. The shape of the end cap 12 can be adapted to the shape of the housing 11. For example, when the housing 11 is a cuboid structure, the end cap 12 is a rectangular plate-like structure adapted to the housing 11. Another example is that when the housing 11 is a cylindrical structure, the end cap 12 is a circular plate-like structure adapted to the housing 11. The material of the end cap 12 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The material of the end cap 12 and the housing 11 can be the same or different.

[0062] In some embodiments, please refer to Figures 2 to 5 , the battery device 100a includes a battery cell 10 and a battery box 20 formed with a receiving space for accommodating the battery cell 10. The battery box 20 at least includes a bottom guard plate 21. The bottom guard plate 21 includes a plate body 211, a carbon fiber layer 212 and a polyurea layer 213. The carbon fiber layer 212 is provided on the surface of the plate body 211 facing the receiving space, and the polyurea layer 213 is provided on the surface of the plate body 211 facing away from the receiving space.

[0063] In some embodiments, the tensile strength of the plate body 211 is 700 MPa to 1500 MPa.

[0064] The tensile strength of the plate body 211 can be 700 MPa, 750 MPa, 800 MPa, 830 MPa, 850 MPa, 880 MPa, 900 MPa, 920 MPa, 950 MPa, 985 MPa, 1000 MPa, 1050 MPa, 1100 MPa, 1130 MPa, 1180 MPa, 1200 MPa, 1250 MPa, 1280 MPa, 1300 MPa, 1360 MPa, 1375 MPa, 1400 MPa, 1450 MPa, 1490 MPa, 1500 MPa, etc., but not limited thereto. The specific value of the tensile strength of the plate body 211 can be selected according to the actual situation as long as the tensile strength of the plate body 211 is within the range of 700 MPa to 1500 MPa.

[0065] In some embodiments, the tensile strength of the plate body 211 is 900 MPa to 1180 MPa.

[0066] By making the tensile strength of the plate body 211 within the range of 700 MPa to 1500 MPa, the bottom guard plate 21 has sufficient strength and hardness. The plate body 211, in cooperation with the carbon fiber layer 212 and the polyurea layer 213, can significantly improve the structural strength, impact resistance, toughness and extrusion resistance of the bottom guard plate 21, making the bottom guard plate 21 not easily deformed or fractured.

[0067] Among them, the bottom guard plate 21 can play a role in supporting the battery cell 10. The carbon fiber layer 212 is located on the side of the plate body 211 facing the battery cell 10 and can resist the extrusion of the battery cell 10, etc., reducing the risk of the bottom guard plate 21 being deformed by the extrusion of the battery cell 10, etc.

[0068] Among them, the polyurea layer 213 can be provided on the surface of the plate body 211 facing away from the accommodation space by means of brushing or spraying, etc.

[0069] The material of the polyurea layer 213 is an elastomeric substance formed by the reaction of an isocyanate component and an amino compound component. In some embodiments, the polyurea layer 213 contains at least one of a flame retardant, a colorant, and an antioxidant. The flame retardant can improve the flame retardancy of the bottom guard plate 21 and reduce the risks such as fires caused by overheating of the battery box 20 or scratching or impact with other objects. Adding a colorant to the polyurea layer 213 can improve the aesthetics of the bottom guard plate 21. Adding an antioxidant to the polyurea layer 213 can inhibit or delay the degradation of the polyurea layer 213, improve the durability and stability of the polyurea layer 213, and thus extend the service life of the bottom guard plate 21.

[0070] By providing a carbon fiber layer 212 on the surface of the board body 211 facing the accommodation space and a polyurea layer 213 on the surface of the board body 211 facing away from the accommodation space, the carbon fiber layer 212 can absorb and disperse the energy generated when the bottom guard plate 21 is squeezed, thereby playing a role in relieving stress concentration, enabling the bottom guard plate 21 to better resist deformation when being squeezed, and thus improving the toughness of the bottom guard plate 21; the board body 211 can enhance the strength of the bottom guard plate 21, thereby improving its impact resistance; there are a large number of hydrogen bonds between the polyurea molecular chains of the polyurea layer 213, and the hydrogen bonds enhance the interaction between polyurea molecules, which can improve the overall mechanical properties of the polyurea layer 213, enabling the polyurea layer 213 to resist external squeezing and impact, and thus further improving the structural strength and impact resistance of the bottom guard plate 21; at the same time, the carbon fiber layer 212 is provided on the surface of the board body 211 facing the accommodation space, and the board body 211 and the polyurea layer 213 can reduce the impact of the outside world on the carbon fiber layer 212, thereby reducing the risk of the outside world damaging the carbon fiber layer 212; the arrangement of the carbon fiber layer 212, the board body 211 and the polyurea layer 213 can balance the improvement of the structural strength, impact resistance, toughness and extrusion resistance of the bottom guard plate 21, and can reduce the risk of deformation of the bottom guard plate 21 when being impacted or squeezed, and thus can improve the reliability of the battery device 100a.

[0071] In addition, the fibers in the carbon fiber layer 212 are composed of carbon atoms and have a stable chemical structure, enabling the carbon fiber layer 212 to have good corrosion resistance and high-temperature resistance. The polyurea layer 213 is continuous and dense and has a highly cross-linked network structure, enabling the polyurea layer 213 to have the ability to resist acids, alkalis, neutral salt spray and high temperatures. By providing the carbon fiber layer 212 on the surface of the board body 211 facing the accommodation space and the polyurea layer 213 on the surface of the board body 211 facing away from the accommodation space, the overall corrosion resistance and high-temperature resistance of the bottom guard plate 21 can also be improved, and thus the reliability of the battery device 100a can be further improved; at the same time, the carbon fiber layer 212 and the polyurea layer 213 are light in weight, which can reduce the weight of the bottom guard plate 21, and thus improve the energy utilization efficiency and endurance of the battery device 100a.

[0072] In some embodiments, the thickness of the carbon fiber layer 212 is 0.9 mm to 1.1 mm.

[0073] The thickness of the carbon fiber layer 212 can be 0.9 mm, 0.92 mm, 0.93 mm, 0.95 mm, 0.975 mm, 0.988 mm, 1 mm, 1.02 mm, 1.035 mm, 1.055 mm, 1.068 mm, 1.088 mm, 1.1 mm, etc., but not limited thereto. The thickness of the carbon fiber layer 212 can be selected according to the actual situation, as long as the thickness of the carbon fiber layer 212 is within the range of 0.9 mm to 1.1 mm.

[0074] By making the thickness of the carbon fiber layer 212 within the range of 0.9 mm to 1.1 mm, on the one hand, the carbon fiber layer 212 can exert its excellent corrosion resistance, and can significantly improve the toughness of the bottom guard plate 21, making the bottom guard plate 21 not easy to be corroded and deformed, and can improve the supporting ability and protection effect of the bottom guard plate 21 on the battery cell 10; on the other hand, the weight of the carbon fiber layer 212 is relatively light, which can improve the energy utilization efficiency and endurance of the battery device 100a. When the bottom guard plate 21 is used in the battery device 100a of the vehicle 1000a, it can also reduce the influence of the weight of the bottom guard plate 21 on the energy consumption, endurance and other aspects of the vehicle 1000a.

[0075] In some embodiments, the thickness of the plate body 211 is 0.4 mm to 1.6 mm.

[0076] The thickness of the plate body 211 can be 0.4 mm, 0.45 mm, 0.48 mm, 0.5 mm, 0.55 mm, 0.575 mm, 0.6 mm, 0.65 mm, 0.685 mm, 0.7 mm, 0.72 mm, 0.75 mm, 0.78 mm, 0.8 mm, 0.835 mm, 0.85 mm, 0.88 mm, 0.9 mm, 0.92 mm, 0.95 mm, 0.98 mm, 1 mm, 1.15 mm, 1.22 mm, 1.28 mm, 1.3 mm, 1.355 mm, 1.38 mm, 1.4 mm, 1.42 mm, 1.46 mm, 1.488 mm, 1.5 mm, 1.53 mm, 1.55 mm, 1.58 mm, 1.6 mm, etc., but not limited thereto. The specific thickness of the plate body 211 can be selected according to the actual situation, as long as the thickness of the plate body 211 is within the range of 0.4 mm to 1.6 mm.

[0077] In some embodiments, the thickness of the plate body 211 is 0.7 mm.

[0078] By making the thickness of the plate body 211 within the range of 0.4 mm to 1.6 mm, on the one hand, the bottom guard plate 21 has sufficient strength and hardness, is not prone to deformation or fracture, and can improve the supporting ability and protection effect of the bottom guard plate 21 on the battery cell 10; on the other hand, the weight of the bottom guard plate 21 is lighter. When the bottom guard plate 21 is used in the battery device 100a of the vehicle 1000a, it can reduce the impact of the weight of the bottom guard plate 21 on the energy consumption, endurance, etc. of the vehicle 1000a.

[0079] In addition, if the thickness of the plate body 211 is less than 0.4 mm, the thickness below 0.4 mm will cause insufficient mechanical strength of the bottom guard plate 21, resulting in the bottom guard plate 21 being unable to withstand external extrusion and impact well, and being prone to risks such as deformation or fracture, increasing the risk of damage to the battery device 100a and affecting the reliability of the battery device 100a; if the thickness of the plate body 211 is greater than 1.6 mm, it will cause the bottom guard plate 21 to be too heavy. When the bottom guard plate 21 is used in the battery device 100a of the vehicle 1000a, the weight of the bottom guard plate 21 may affect the endurance and energy consumption of the vehicle 1000a.

[0080] In some embodiments, the thickness of the polyurea layer 213 is 0.3 mm to 3 mm.

[0081] The thickness of the polyurea layer 213 can be 0.3 mm, 0.32 mm, 0.38 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.52 mm, 0.55 mm, 0.58 mm, 0.6 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.35 mm, 1.4 mm, 1.53 mm, 1.55 mm, 1.6 mm, 1.66 mm, 1.7 mm, 1.8 mm, 1.95 mm, 2 mm, 2.2 mm, 2.35 mm, 2.4 mm, 2.45 mm, 2.5 mm, 2.52 mm, 2.55 mm, 2.585 mm, 2.6 mm, 2.635 mm, 2.66 mm, 2.7 mm, 2.75 mm, 2.78 mm, 2.8 mm, 2.845 mm, 2.88 mm, 2.9 mm, 2.935 mm, 2.966 mm, 3 mm, etc., but not limited thereto. The specific thickness of the polyurea layer 213 can be selected according to the actual situation as long as the thickness of the polyurea layer 213 is within the range of 0.3 mm to 3 mm.

[0082] In some embodiments, the thickness of the polyurea layer 213 is 1.5 mm.

[0083] By making the thickness of the polyurea layer 213 within the range of 0.3 mm to 3 mm, on the one hand, the polyurea layer 213 can exert its excellent corrosion resistance, high temperature resistance, wear resistance, and impact resistance, etc., so that the polyurea layer 213 can provide a better protection effect for the plate body 211. On the other hand, the usage amount of the polyurea layer 213 can be saved and the cost can be reduced.

[0084] In addition, if the thickness of the polyurea layer 213 is less than 0.3 mm, the thickness below 0.3 mm will lead to insufficient thickness of the polyurea layer 213, making it difficult to resist external collisions, scratches, and impacts, resulting in poor protection effect of the polyurea layer 213 on the plate body 211. Moreover, the production process of the polyurea layer 213 is difficult, and it is hard to ensure the thickness consistency and accuracy of the polyurea layer 213. If the thickness of the polyurea layer 213 is greater than 3 mm, it will lead to too high cost of the polyurea layer 213.

[0085] By making the thickness of the carbon fiber layer 212 within the range of 0.9 mm to 1.1 mm, the thickness of the plate body 211 within the range of 0.4 mm to 1.6 mm, and at the same time making the thickness of the polyurea layer 213 within the range of 0.3 mm to 3 mm, not only can the structural strength, impact resistance, and toughness of the bottom guard plate 21 be improved, but also the overall thickness of the bottom guard plate 21 can be reduced and the weight of the bottom guard plate 21 can be lightened.

[0086] In some embodiments, please refer to Figure 6 , the plate body 211 includes a steel plate, and the bottom guard plate 21 further includes a first connection layer 214. The first connection layer 214 is disposed between the carbon fiber layer 212 and the steel plate, and the polyurea layer 213 is disposed on the surface of the steel plate facing away from the carbon fiber layer 212.

[0087] Among them, the steel plate can be any one of carbon steel, manganese steel, carbon manganese steel, and bainitic high-strength steel.

[0088] Among them, the first connection layer 214 can be used as an adhesive layer for connecting the carbon fiber layer 212 and the steel plate. There is a good bonding force between the surface of the first connection layer 214 and the surface of the carbon fiber layer 212, and there is also a good bonding force between the surface of the first connection layer 214 and the surface of the steel plate, which can increase the adhesion between the carbon fiber layer 212 and the steel plate, thereby improving the connection stability between the carbon fiber layer 212 and the steel plate and making it difficult for the carbon fiber layer 212 and the steel plate to separate. The polyurea layer 213 can improve the structural strength and impact resistance of the steel plate, and at the same time can also relieve the corrosion of the steel plate.

[0089] By providing a first connection layer 214 between the carbon fiber layer 212 and the steel plate, the carbon fiber layer 212 and the steel plate can be integrated, enhancing the overall performance of the bottom guard plate 21, significantly improving the overall strength and toughness of the bottom guard plate 21, and enabling the bottom guard plate 21 to maintain good stability during use, reducing the risk of separation between the carbon fiber layer 212 and the steel plate, and further enhancing the reliability of the battery device 100a.

[0090] In some embodiments, please refer to Figure 7 , the carbon fiber layer 212 includes a plurality of carbon fiber sub-layers 2121 arranged in layers and a second connection layer 2122 provided between two adjacent carbon fiber sub-layers 2121.

[0091] Among them, the number of the carbon fiber sub-layers 2121 is 2, 3, 5, 6, 8, etc., but is not limited thereto, and the specific number of the carbon fiber sub-layers 2121 can be selected according to the actual situation.

[0092] The second connection layer 2122 can be used as an adhesive layer for connecting two adjacent carbon fiber sub-layers 2121. There is a good bonding force between the surface of the second connection layer 2122 and the surface of the carbon fiber sub-layer 2121, which can increase the adhesion between two adjacent carbon fiber sub-layers 2121, thereby improving the connection stability between two adjacent carbon fiber sub-layers 2121 and making it difficult for two adjacent carbon fiber sub-layers 2121 to separate.

[0093] In some embodiments, in addition to being provided between two adjacent carbon fiber sub-layers 2121, the second connection layer 2122 is also provided on the surface of the carbon fiber sub-layer 2121 closest to the plate body 211 facing the plate body 211 and on the surface of the carbon fiber sub-layer 2121 farthest from the plate body 211 facing away from the plate body 211.

[0094] In some embodiments, the carbon fiber sub-layer 2121 includes, but is not limited to, prepregs such as 3K twill prepreg, T300 plain weave prepreg, T700 carbon cloth, and unidirectional prepreg.

[0095] In some embodiments, the carbon fiber layer 212 can be prepared by hot molding. First, the carbon fiber sub-layers 2121 are placed layer by layer in a mold, and a connecting coating is provided between two adjacent carbon fiber sub-layers 2121. The connecting coating can be provided on the surface of the carbon fiber sub-layers 2121 by brushing, roller coating, scraping or spraying; or the connecting coating is placed in the mold, and then the carbon fiber sub-layers 2121 are placed layer by layer in the mold so that the connecting coating infiltrates the carbon fiber sub-layers 2121; then the mold is closed so that the carbon fiber sub-layers 2121 and the connecting coating are hot molded in the mold. The connecting coating is cured under high temperature and high pressure in the mold to form a second connecting layer 2122, and the second connecting layer 2122 is connected between two adjacent carbon fiber sub-layers 2121 to form the carbon fiber layer 212.

[0096] In some embodiments, the carbon fiber layer 212 can also be prepared by injection molding, extrusion molding or other methods, but not limited thereto.

[0097] Since the carbon fiber layer 212 includes multiple carbon fiber sub-layers 2121, the multiple carbon fiber sub-layers 2121 can improve the toughness, fatigue resistance and shock absorption performance of the carbon fiber layer 212; by providing a second connecting layer 2122 between two adjacent carbon fiber sub-layers 2121, the multiple carbon fiber sub-layers 2121 can form a tight composite structure. This tight composite structure enables the carbon fiber layer 212 to absorb more energy when subjected to external forces, thereby further improving the toughness, fatigue resistance and shock absorption performance of the carbon fiber layer 212.

[0098] In some embodiments, the thickness of the carbon fiber sub-layer 2121 is 0.1 mm to 0.3 mm.

[0099] The thickness of the carbon fiber sub-layer 2121 can be 0.1 mm, 0.12 mm, 0.135 mm, 0.15 mm, 0.166 mm, 0.18 mm, 0.2 mm, 0.222 mm, 0.25 mm, 0.266 mm, 0.27 mm, 0.285 mm, 0.3 mm, etc., but not limited thereto. The specific thickness of the carbon fiber sub-layer 2121 can be selected according to the actual situation as long as the thickness of the carbon fiber sub-layer 2121 is within the range of 0.1 mm to 0.3 mm.

[0100] In some embodiments, the thickness of the carbon fiber sub-layer 2121 is 0.2 mm.

[0101] By making the thickness of the carbon fiber sub-layer 2121 within the range of 0.1 mm to 0.3 mm, the mutual interference between the fibers in the carbon fiber sub-layer 2121 can be reduced, making the distribution of the fibers more uniform, which is beneficial to improving the toughness of the carbon fiber sub-layer 2121, reducing or eliminating the risk of deformation of the carbon fiber sub-layer 2121 when being squeezed, and thus improving the reliability of the bottom guard plate 21.

[0102] In addition, if the thickness of the carbon fiber sub-layer 2121 is less than 0.1 mm, the thickness below 0.1 mm will result in insufficient toughness of the carbon fiber sub-layer 2121, making the bottom guard plate 21 prone to deformation when being squeezed, increasing the risk of damage to the battery device 100a and affecting the reliability of the battery device 100a; if the thickness of the carbon fiber sub-layer 2121 is greater than 0.3 mm, the mutual interference between the fibers in the carbon fiber sub-layer 2121 will increase, making it difficult for the fibers to achieve uniform distribution, and further making it difficult for the carbon fiber sub-layer 2121 to absorb and disperse the energy generated when the bottom guard plate 21 is squeezed. Therefore, when the thickness of the carbon fiber sub-layer 2121 is greater than 0.3 mm, it will also result in insufficient toughness of the carbon fiber sub-layer 2121.

[0103] In some embodiments, at least two adjacent carbon fiber sub-layers 2121 are arranged at different laying angles.

[0104] Wherein, the battery box body 20 includes a first side wall 221 and a second side wall 222 that are oppositely arranged in the first direction X-X, and a third side wall 223 and a fourth side wall 224 that are oppositely arranged in the second direction Y-Y. The first direction X-X is perpendicular to the second direction Y-Y, the first direction X-X is perpendicular to the arrangement direction of the polyurea layer 213, the plate body 211 and the carbon fiber layer 212, and the second direction Y-Y is perpendicular to the arrangement direction of the polyurea layer 213, the plate body 211 and the carbon fiber layer 212.

[0105] Wherein, the laying angle of the carbon fiber sub-layer 2121 can be the included angle between the arrangement direction of the fibers in the carbon fiber sub-layer 2121 and the first direction X-X, or the laying angle of the carbon fiber sub-layer 2121 can also be the included angle between the arrangement direction of the fibers in the carbon fiber sub-layer 2121 and the second direction Y-Y.

[0106] By making at least two adjacent carbon fiber sub-layers 2121 arranged at different laying angles, when the bottom guard plate 21 is squeezed or impacted, it can better absorb and disperse the energy generated when the bottom guard plate 21 is impacted or squeezed, thereby playing a role in relieving stress concentration, enabling the bottom guard plate 21 to better resist deformation. At the same time, it can also relieve the vibration generated when the bottom guard plate 21 is impacted or squeezed, and thus improve the vibration isolation performance of the bottom guard plate 21.

[0107] In some embodiments, please continue to refer toFigure 7 The carbon fiber layer 212 includes two carbon fiber sub-layers 2121, where the laying angle of one carbon fiber sub-layer 2121 is +45°, and the laying angle of the other carbon fiber sub-layer 2121 is -45°.

[0108] Wherein, when the laying angle of the carbon fiber sub-layer 2121 close to the plate body 211 is +45°, the laying angle of the carbon fiber sub-layer 2121 far from the plate body 211 is -45°; when the laying angle of the carbon fiber sub-layer 2121 close to the plate body 211 is -45°, the laying angle of the carbon fiber sub-layer 2121 far from the plate body 211 is +45°.

[0109] By making the laying angle of one of the two carbon fiber sub-layers 2121 be +45° and the laying angle of the other carbon fiber sub-layer 2121 be -45°, when the bottom guard plate 21 is subjected to extrusion or impact, the two carbon fiber sub-layers 2121 can work together, having the ability to resist the tensile force and shear force generated by extrusion or impact in multiple directions, and can enhance the tensile resistance and shear resistance of the carbon fiber layer 212, thereby improving the toughness of the bottom guard plate 21.

[0110] In some embodiments, the material of the first connection layer 214 is epoxy resin, polyimide resin, bismaleimide resin or phenolic resin, and the material of the second connection layer 2122 is epoxy resin, polyimide resin, bismaleimide resin or phenolic resin.

[0111] Wherein, the first connection layer 214 serves as the adhesive layer between the carbon fiber layer 212 and the plate body 211, and the second connection layer 2122 serves as the adhesive layer between two adjacent carbon fiber sub-layers 2121.

[0112] Epoxy resin, polyimide resin, bismaleimide resin and phenolic resin can crosslink and polycondense during the curing process to form a crosslinked structure, which can fill the gaps between the carbon fiber layer 212 and the plate body 211, the gaps between adjacent carbon fiber sub-layers 2121 and the gaps inside the carbon fiber sub-layer 2121, so that the plate body 211 and the multi-layer carbon fiber sub-layers 2121 form an integral body, which can not only improve the connection strength between the carbon fiber sub-layers 2121 and the connection strength between the carbon fiber layer 212 and the plate body 211, but also enhance the overall structural strength and toughness of the carbon fiber layer 212.

[0113] In some embodiments, please refer to Figure 8 The bottom guard plate 21 further includes a first coating layer 215 and a second coating layer 216. The first coating layer 215 is provided between the plate body 211 and the carbon fiber layer 212, and the second coating layer 216 is provided between the plate body 211 and the polyurea layer 213.

[0114] Among them, the first coating layer 215 can be formed on the surface of the plate body 211 facing the accommodation space by hot dip plating, electroplating, infiltration plating, etc. The carbon fiber layer 212 is disposed on the surface of the first coating layer 215 facing away from the plate body 211 through the first connection layer 214. The second coating layer 216 can be formed on the surface of the plate body 211 facing away from the accommodation space by hot dip plating, electroplating, infiltration plating, etc. The polyurea layer 213 can be disposed on the surface of the second coating layer 216 facing away from the plate body 211 by brushing or spraying. The first coating layer 215 and the second coating layer 216 can block substances such as liquid from contacting the plate body 211, thereby slowing down the corrosion rate of the plate body 211.

[0115] By disposing the first coating layer 215 between the plate body 211 and the carbon fiber layer 212, and disposing the second coating layer 216 between the plate body 211 and the polyurea layer 213, substances such as liquid can be blocked from contacting the plate body 211, reducing the risk of corrosion of the plate body 211.

[0116] In some embodiments, please refer to Figure 9 , the first connection layer 214 is disposed between the first coating layer 215 and the carbon fiber layer 212, which can increase the connection strength between the first coating layer 215 and the carbon fiber layer 212, and reduce the risk of separation between the first coating layer 215 and the carbon fiber layer 212.

[0117] In some embodiments, the first coating layer 215 includes a galvanized layer or a galvanized magnesium aluminum layer, and the second coating layer 216 includes a galvanized layer or a galvanized magnesium aluminum layer.

[0118] In some embodiments, the first coating layer 215 and / or the second coating layer 216 can be a galvanized layer. The galvanized layer is disposed on the surface of the plate body 211, which can play a role in blocking substances such as liquid from contacting the plate body 211; when the first coating layer 215 and / or the second coating layer 216 is damaged, a primary battery will be formed between the galvanized layer and the plate body 211 in a humid environment. Among them, the galvanized layer serves as the anode and is preferentially corroded, and the plate body 211 serves as the cathode and is protected, thereby playing a role in alleviating the corrosion of the plate body 211. In addition, the product formed after the galvanized layer is oxidized by oxygen is usually very dense, and the product can cover the damaged part, thereby reducing the corrosion rate of the galvanized layer and improving the overall corrosion resistance of the bottom guard plate 21.

[0119] In some embodiments, the first coating layer 215 and / or the second coating layer 216 may be a galvanized magnesium aluminum layer. The galvanized magnesium aluminum layer may be a zinc magnesium aluminum alloy layer. The galvanized magnesium aluminum layer is disposed on the surface of the plate body 211 and can play a role in blocking the contact between substances such as liquids and the plate body 211; when the first coating layer 215 and / or the second coating layer 216 is damaged, zinc and the plate body 211 will form a primary battery in a humid environment. Among them, zinc, as the anode, is preferentially corroded, and the plate body 211, as the cathode, is protected. This sacrificial anode protection effectively alleviates the corrosion rate of the plate body 211 and can improve the overall corrosion resistance of the bottom guard plate 21. At the same time, magnesium and aluminum can react with air to form a dense oxide film, and the oxide film can cover the damaged part, thereby preventing further corrosion of zinc and the plate body 211, further enhancing the corrosion resistance of the plate body 211, and further improving the corrosion resistance of the bottom guard plate 21.

[0120] The setting of the galvanized layer or the galvanized magnesium aluminum layer can effectively improve the overall corrosion resistance of the bottom guard plate 21.

[0121] In some embodiments, such as Figures 2 to 4 , Figure 10 as shown, the battery box body 20 further includes a frame body 22. The frame body 22 is connected to the outer peripheral area of the bottom guard plate 21 to form an accommodation space with the bottom guard plate 21.

[0122] In some embodiments, the frame body 22 may include a first part 22a and a second part 22b. The first part 22a includes a first side wall 221 and a second side wall 222 that are oppositely arranged in the first direction X-X and a third side wall 223 and a fourth side wall 224 that are oppositely arranged in the second direction Y-Y. The first part 22a may be a hollow structure with openings formed at both ends, and the second part 22b may be a hollow structure with an opening at one end or a plate-like structure. The second part 22b covers the opening at one end of the first part 22a, and the bottom guard plate 21 covers the opening at the other end of the first part 22a to form an accommodation space. The bottom guard plate 21 serves as the bottom wall of the battery box body 20 and is used to support and protect the battery cells 10.

[0123] In some embodiments, the bottom guard plate 21 is provided with mounting holes 21a. The mounting holes 21a can be used to cooperate with the fixing components 30 to mount the bottom guard plate 21 on the frame body 22 of the battery box body 20. An anti-corrosion layer may be provided on the inner wall of the mounting holes 21a to alleviate the corrosion of the inner wall of the mounting holes 21a. Among them, the fixing components 30 include but are not limited to screws, bolts, studs or rivets. Among them, the material of the anti-corrosion layer includes but is not limited to epoxy resin anti-corrosion paint, rubber resin anti-corrosion paint, modified resin anti-corrosion paint, polyurethane anti-corrosion paint, acrylate anti-corrosion paint or inorganic zinc-rich anti-corrosion paint.

[0124] By connecting the frame body 22 to the outer peripheral area of the bottom guard plate 21 to form a receiving space with the bottom guard plate 21, the bottom guard plate 21 can serve as the bottom wall of the battery box body 20, which can enhance the structural strength, impact resistance and toughness of the bottom wall of the battery box body 20, reduce the risk of deformation of the bottom wall of the battery box body 20 when being impacted or squeezed, and thus improve the reliability of the battery device 100a.

[0125] In some embodiments, such as Figures 2 to 4 , Figure 11 shown, the battery box body 20 further includes a frame body 22 and a bottom shell 23. The frame body 22 is connected to the outer peripheral area of the bottom shell 23 to form a receiving space with the bottom shell 23, and the bottom guard plate 21 is arranged on the side of the bottom shell 23 facing away from the receiving space.

[0126] In some embodiments, the frame body 22 may include a first part 22a, a second part 22b and a bottom shell 23. The first part 22a has a hollow structure with openings formed at both ends. The second part 22b may be a hollow structure with one end open or a plate-like structure. The second part 22b covers the opening at one end of the first part 22a, and the bottom shell 23 covers the opening at the other end of the first part 22a. Among them, the first part 22a and the bottom shell 23 may be fixedly combined together by welding, bolt connection, bonding and other means. In other embodiments, the first part 22a and the bottom shell 23 are integrally formed structures. The first part 22a and the bottom shell 23 may be integrally formed by forging, stamping and other means. An opening is formed at one end of the first part 22a away from the bottom shell 23, and the second part 22b may be a hollow structure with one end open or a plate-like structure. The second part 22b covers the opening of the first part 22a.

[0127] In some embodiments, the mounting holes 21a on the bottom guard plate 21 can be used to cooperate with the fixing component 30 to mount the bottom guard plate 21 on the bottom shell 23 of the battery box body 20.

[0128] By arranging the bottom guard plate 21 on the side of the bottom shell 23 facing away from the receiving space, the structural strength, impact resistance and toughness of the bottom shell 23 of the battery box body 20 can be enhanced, and the risk of deformation of the bottom shell 23 of the battery box body 20 when being impacted or squeezed can be reduced, thereby improving the reliability of the battery device 100a.

[0129] In some embodiments, such as Figures 6 to 7As shown in the figure, a carbon fiber layer 212 is provided on the surface of the plate body 211 facing the accommodation space, a polyurea layer 213 is provided on the surface of the plate body 211 facing away from the accommodation space, a first connection layer 214 is provided between the carbon fiber layer 212 and the plate body 211. The carbon fiber includes two carbon fiber sub-layers 2121 and a second connection layer 2122 provided between the two carbon fiber sub-layers 2121. Among them, the plate body 211 is made of high-strength steel, the thickness of the plate body 211 is 0.5 mm to 1.5 mm, the tensile strength of the plate body 211 is 900 MPa to 1180 MPa, the thickness of the carbon fiber sub-layer 2121 is 0.2 mm, the thickness of the carbon fiber layer 212 is 1 mm, and the thickness of the polyurea layer 213 is 1.5 mm.

[0130] The present application further provides a bottom guard plate. Among them, the bottom guard plate includes a plate body 211, a carbon fiber layer 212, and a polyurea layer 213. The carbon fiber layer 212 is provided on one surface of the plate body 211, and the polyurea layer 213 is provided on the surface of the plate body 211 facing away from the carbon fiber layer 212. The structure of this bottom guard plate can refer to the bottom guard plate 21 in the above-mentioned embodiment. This bottom guard plate 21 can be used for the battery device 100a and the electrical equipment. Since the bottom guard plate 21 is used for the battery device 100a and the electrical equipment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiment.

[0131] According to some embodiments of the present application, the above-mentioned battery device 100a or the above-mentioned bottom guard plate 21 can be used on electrical equipment. With such a setting, by providing a carbon fiber layer 212 on the surface of the plate body 211 facing the accommodation space and a polyurea layer 213 on the surface of the plate body 211 facing away from the accommodation space, the carbon fiber layer 212 can absorb and disperse the energy generated when the bottom guard plate 21 is squeezed, thereby playing a role in alleviating stress concentration, so that the bottom guard plate 21 can better resist deformation when being squeezed, and thus the toughness of the bottom guard plate 21 can be improved; the plate body 211 can enhance the strength of the bottom guard plate 21, thereby improving its impact resistance; there are a large number of hydrogen bonds between the polyurea molecular chains of the polyurea layer 213, and the hydrogen bonds enhance the interaction between the polyurea molecules, which can improve the overall mechanical properties of the polyurea layer 213, so that the polyurea layer 213 can resist external squeezing and impact, and thus can further improve the structural strength and impact resistance of the bottom guard plate 21; at the same time, the carbon fiber layer 212 is provided on the surface of the plate body 211 facing the accommodation space, and the plate body 211 and the polyurea layer 213 can reduce the impact of the outside world on the carbon fiber layer 212, thereby reducing the risk of the outside world damaging the carbon fiber layer 212; the settings of the carbon fiber layer 212, the plate body 211, and the polyurea layer 213 can take into account improving the structural strength and impact resistance, toughness and anti-extrusion performance of the bottom guard plate 21, and can reduce the risk of the bottom guard plate 21 deforming when being impacted or squeezed, so the reliability of the battery device 100a can be improved.

[0132] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that, The battery device includes battery cells and a battery box body having an accommodation space for accommodating the battery cells. The battery box body at least includes a bottom guard plate, and the bottom guard plate includes: a plate body; a carbon fiber layer provided on a surface of the plate body facing the accommodation space; a polyurea layer provided on a surface of the plate body facing away from the accommodation space.

2. The battery device according to claim 1, characterized in that, The thickness of the carbon fiber layer is 0.9 mm to 1.1 mm.

3. The battery device according to claim 1, characterized in that, The thickness of the plate body is 0.4 mm to 1.6 mm.

4. The battery device according to claim 1, wherein The thickness of the polyurea layer is 0.3 mm to 3 mm.

5. The battery device according to any one of claims 1 to 4, characterized in that The plate body includes a steel plate. The bottom guard plate further includes a first connection layer provided between the carbon fiber layer and the steel plate, and the polyurea layer is provided on a surface of the steel plate facing away from the carbon fiber layer.

6. The battery device according to claim 5, wherein, The carbon fiber layer includes multiple stacked carbon fiber sub-layers and a second connection layer provided between two adjacent carbon fiber sub-layers.

7. The battery device according to claim 6, characterized in that, The thickness of the carbon fiber sub-layer is 0.1 mm to 0.3 mm.

8. The battery device according to claim 6, characterized in that, At least two adjacent carbon fiber sub-layers have different laying angles.

9. The battery device according to claim 6, characterized in that, The carbon fiber layer includes two carbon fiber sub-layers, wherein the laying angle of one carbon fiber sub-layer is +45°, and the laying angle of the other carbon fiber sub-layer is -45°.

10. The battery device according to claim 6, characterized in that, The material of the first connection layer is epoxy resin, polyimide resin, bismaleimide resin or phenolic resin, and the material of the second connection layer is epoxy resin, polyimide resin, bismaleimide resin or phenolic resin.

11. The battery device according to claim 1, characterized in that, The bottom guard plate further includes a first coating layer and a second coating layer. The first coating layer is provided between the plate body and the carbon fiber layer, and the second coating layer is provided between the plate body and the polyurea layer.

12. The battery device according to claim 11, wherein, The first coating layer includes a galvanized layer or a galvanized magnesium aluminum layer, and the second coating layer includes a galvanized layer or a galvanized magnesium aluminum layer.

13. The battery device according to claim 1, characterized in that, The battery box body further includes a frame connected to an outer peripheral area of the bottom guard plate to form the accommodation space with the bottom guard plate.

14. The battery device according to claim 1, characterized in that, The battery box body further includes a frame and a bottom shell. The frame is connected to an outer peripheral area of the bottom shell to form the accommodation space with the bottom shell, and the bottom guard plate is provided on a side of the bottom shell facing away from the accommodation space.

15. A bottom guard plate, characterized in that, The bottom guard plate includes: a plate body; a carbon fiber layer provided on one surface of the plate body; a polyurea layer provided on a surface of the plate body facing away from the carbon fiber layer.

16. The bottom guard plate according to claim 15, characterized in that, The plate body includes a steel plate. The bottom guard plate further includes a first connection layer provided between the carbon fiber layer and the steel plate, and the polyurea layer is provided on a surface of the steel plate facing away from the carbon fiber layer.

17. The bottom guard plate according to claim 16, characterized in that, The carbon fiber layer includes multiple stacked carbon fiber sub-layers and a second connection layer provided between two adjacent carbon fiber sub-layers.

18. An electrical device, wherein, The electrical equipment includes: The battery device according to any one of claims 1 to 14, or the bottom guard plate according to any one of claims 15 to 17.

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