Battery device, bottom protection plate and electric equipment

Abstract

The utility model provides 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, the bottom protection plate is at least used for supporting the battery monomer, the bottom protection plate comprises a plate body and a first polyurea layer, and the first polyurea layer is arranged on the plate body. An anti-corrosion layer is arranged on the surface, facing the accommodating space, of the plate body, the first polyurea layer is arranged on the surface, back to the accommodating space, of the plate body, and the reliability of the battery device can be 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 installed on the chassis. The chassis of some new energy vehicles is relatively low. Due to the uncertainty of the road conditions during vehicle driving, there are risks such as the chassis colliding with, scratching against the ground or hitting objects such as gravel, which may cause damage to the battery device. In order to improve the protection of the battery device, the bottom guard plate came into being.

[0003] In the related art, a polyvinyl chloride (PVC) coating is usually used as the scratch-resistant layer and corrosion-resistant layer of the bottom guard plate. However, the scratch-resistant ability of polyvinyl chloride is very limited and it is easy to fall off when encountering collisions, scratches or hitting objects such as gravel, resulting in problems such as the bottom guard plate being easily corroded, 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 improve the corrosion resistance, high temperature resistance, wear resistance and impact resistance of the bottom guard plate, thereby improving 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 body formed with a receiving space for receiving the battery cells. The battery box body includes at least a bottom protection plate which is at least used to support the battery cells. The bottom protection plate includes: a plate body, on the surface facing the receiving space, there is an anti-corrosion layer; a first polyurea layer, disposed on the surface of the plate body facing away from the receiving space. By providing an anti-corrosion layer on the surface of the plate body facing the receiving space and simultaneously disposing the first polyurea layer on the surface of the plate body facing away from the receiving space, on the one hand, the first polyurea layer is continuous and dense, being a highly cross-linked network structure, and there are a large number of hydrogen bonds between the polyurea molecular chains of the first polyurea layer. The hydrogen bonds enhance the interaction force between the polyurea molecules, which can improve the overall mechanical properties of the first polyurea layer. The highly cross-linked network structure and hydrogen bonds not only endow the first polyurea layer with extremely high hardness, rigidity and adhesion, making the first polyurea layer able to resist external collisions, scratches and impacts and not easy to fall off, which can improve the mechanical strength, wear resistance and impact resistance of the bottom protection plate, but also enable the first polyurea layer to have the ability to resist acids, alkalis, neutral salt spray and high temperatures, so that the first polyurea layer is not easy to be corroded and not easy to be decomposed at high temperatures, which can improve the corrosion resistance and high temperature resistance of the bottom protection plate, thereby improving the reliability of the battery device; on the other hand, the anti-corrosion layer is disposed on the surface of the plate body facing the receiving space, which can block the contact between liquids and other substances and the plate body, thereby further improving the corrosion resistance of the bottom protection plate, and thus further improving the reliability of the battery device.

[0006] In some embodiments, the thickness of the first polyurea layer is 0.3 mm to 3 mm. By making the thickness of the first polyurea layer within the range of 0.3 mm to 3 mm, on the one hand, the thickness of the first polyurea layer is moderate, which can exert its excellent corrosion resistance, high temperature resistance, wear resistance and impact resistance and other properties, so that the first 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 first polyurea layer and reduce the cost.

[0007] In some embodiments, the thickness of the first polyurea layer is 0.5 mm to 1.5 mm. By making the thickness of the first polyurea layer within the range of 0.5 mm to 1.5 mm, not only can the first polyurea layer play a better protection effect on the plate body, but also it can significantly improve the corrosion resistance, high temperature resistance, wear resistance and impact resistance of the bottom protection plate, and at the same time, it can maintain economic rationality, so that the cost of the bottom protection plate can be controlled within a reasonable range.

[0008] In some embodiments, the pull-out strength of the first polyurea layer is greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the first polyurea layer is less than or equal to 20 mg, the tensile strength of the first polyurea layer is greater than or equal to 10 MPa, and the tear strength of the first polyurea layer is greater than or equal to 10 N / mm. By making the pull-out strength of the first polyurea layer greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the first polyurea layer less than or equal to 20 mg, the tensile strength of the first polyurea layer greater than or equal to 10 MPa, and the tear strength of the first polyurea layer greater than or equal to 10 N / mm, the first polyurea layer can exert its excellent corrosion resistance, high temperature resistance, wear resistance, and impact resistance, etc., so that the first polyurea layer can provide a better protection effect on the plate body.

[0009] In some embodiments, the anti-corrosion layer includes one or more of a first coating layer, a first electrophoretic paint layer, an anti-corrosion paint layer, and a second polyurea layer. By disposing one or more of the first coating layer, the first electrophoretic paint layer, the anti-corrosion paint layer, and the second polyurea layer on the surface of the plate body facing the accommodation space, substances such as liquid can be blocked from contacting the plate body, thereby further improving the corrosion resistance of the bottom guard plate, and thus the reliability of the battery device can be further improved.

[0010] In some embodiments, the plate body includes a steel plate, the anti-corrosion layer includes a first coating layer, the bottom guard plate further includes a second coating layer, the first coating layer is disposed on the surface of the steel plate facing the accommodation space, the second coating layer is disposed on the surface of the steel plate facing away from the accommodation space, and the first polyurea layer is disposed on the surface of the second coating layer facing away from the steel plate. By disposing the first coating layer on the surface of the steel plate facing the accommodation space, the second coating layer on the surface of the steel plate facing away from the accommodation space, and the first polyurea layer on the surface of the second coating layer facing away from the steel plate, on the one hand, the first coating layer and the second coating layer wrap the outer surface of the steel plate, which can block substances such as liquid from contacting the steel plate and reduce the risk of the steel plate being corroded. On the other hand, the second coating layer and the first polyurea layer can provide double protection for the surface of the steel plate facing away from the accommodation space, thereby improving the structural strength and impact resistance of the surface of the steel plate facing away from the accommodation space, and reducing the risk of deformation or cracking of the bottom guard plate when it is subjected to external impact. Therefore, the reliability of the battery device can be improved.

[0011] 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 overall corrosion resistance of the bottom guard plate.

[0012] In some embodiments, the first coating layer includes a galvanized layer, the second coating layer includes a galvanized layer, the anti-corrosion layer further includes a first electrophoretic paint layer, the bottom guard plate further includes a second electrophoretic paint layer, the first electrophoretic paint layer is disposed on the surface of the first coating layer facing away from the steel plate, and the second electrophoretic paint layer is disposed between the first polyurea layer and the second coating layer. By disposing the first electrophoretic paint layer on the surface of the first coating layer facing away from the steel plate and disposing the second electrophoretic paint layer between the first polyurea layer and the second coating layer, on the one hand, the first coating layer and the first electrophoretic paint layer can provide double protection for the surface of the steel plate facing the accommodation space, and can further improve the corrosion resistance of the side of the bottom guard plate facing the accommodation space; on the other hand, the surface roughness of the second electrophoretic paint layer is controllable, and the adhesion between the first polyurea layer and the second electrophoretic paint layer can be adjusted by adjusting the surface roughness of the second electrophoretic paint layer, so as to improve the connection strength between the first polyurea layer and the second electrophoretic paint layer, and further improve the corrosion resistance, high temperature resistance, mechanical strength, wear resistance and impact resistance of the bottom guard plate.

[0013] In some embodiments, the anti-corrosion layer further includes a second polyurea layer, and the second polyurea layer is disposed on the surface of the first coating layer facing away from the steel plate. By disposing the second polyurea layer on the surface of the first coating layer facing away from the steel plate, the second polyurea layer and the first coating layer can provide double protection for the surface of the steel plate facing the accommodation space, which can not only further improve the mechanical strength of the side of the bottom guard plate facing the accommodation space, thereby improving the supporting ability of the bottom guard plate for the battery cell, but also further improve the corrosion resistance and high temperature resistance of the bottom guard plate.

[0014] In some embodiments, the thickness of the second polyurea layer is 0.3 mm to 3 mm. By making the thickness of the second polyurea layer within the range of 0.3 mm to 3 mm, on the one hand, the thickness of the second polyurea layer is moderate, and its excellent corrosion resistance, high temperature resistance, wear resistance and impact resistance can be exerted, so that the second polyurea layer can provide a better protection effect on the plate body, thereby improving the supporting effect of the bottom guard plate on the battery cell; on the other hand, the usage amount of the second polyurea layer can be saved, and the cost can be reduced.

[0015] In some embodiments, the thickness of the second polyurea layer is 0.5 mm to 1.5 mm. By making the thickness of the second polyurea layer within the range of 0.5 mm to 1.5 mm, not only can the second polyurea layer provide a better protection effect on the plate body, but also the corrosion resistance, high temperature resistance, wear resistance and impact resistance of the bottom guard plate can be significantly improved. At the same time, the economic rationality can be maintained, and the cost of the bottom guard plate can be controlled within a reasonable range.

[0016] In some embodiments, the pull-out strength of the second polyurea layer is greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the second polyurea layer is less than or equal to 20 mg, the tensile strength of the second polyurea layer is greater than or equal to 10 MPa, and the tear strength of the second polyurea layer is greater than or equal to 10 N / mm. By making the pull-out strength of the second polyurea layer greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the second polyurea layer less than or equal to 20 mg, the tensile strength of the second polyurea layer greater than or equal to 10 MPa, and the tear strength of the second polyurea layer greater than or equal to 10 N / mm, the second polyurea layer can exhibit its excellent corrosion resistance, high temperature resistance, wear resistance, and impact resistance, etc., so that the second polyurea layer can provide a better protection effect on the plate body.

[0017] In some embodiments, the sum of the thicknesses of the plate body, the first coating layer, and the second coating layer is 0.5 mm to 2.5 mm. By making the sum of the thicknesses of the plate body, the first coating layer, and the second coating layer within the range of 0.5 mm to 2.5 mm, on the one hand, the bottom guard plate has sufficient strength, hardness, and toughness, is not prone to deformation or fracture, and can improve the support effect and protection effect of the bottom guard plate on the battery cell; on the other hand, the bottom guard plate is lighter in weight, and 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 aspects such as the energy consumption and endurance of the vehicle.

[0018] In some embodiments, the sum of the thicknesses of the plate body, the first coating layer, and the second coating layer is 0.7 mm to 1.5 mm. By making the sum of the thicknesses of the plate body, the first coating layer, and the second coating layer within the range of 0.7 mm to 1.5 mm, not only does the bottom guard plate have sufficient strength, hardness, and toughness and is not prone to deformation or fracture, but also the bottom guard plate is lighter in weight, has a smaller impact on the endurance and energy consumption of the vehicle, and can also reduce the risks of scratching or collision between the vehicle chassis and the road surface or other obstacles.

[0019] In some embodiments, the plate body is provided with mounting holes, the first polyurea layer and the second polyurea layer avoid the mounting holes, and the first electrophoretic paint layer and / or the anti-corrosion paint layer is provided on the inner wall of the mounting holes. By providing the first electrophoretic paint layer and / or the anti-corrosion paint layer on the inner wall of the mounting holes and making the first polyurea layer and the second polyurea layer avoid the mounting holes, on the one hand, the setting of the first polyurea layer and the second polyurea layer will not affect the inner diameter of the mounting holes, so that the inner diameter of the mounting holes can be adapted to the outer diameter of the fixing components, and on the other hand, it can alleviate the corrosion of the inner wall of the mounting holes.

[0020] In some embodiments, the bottom guard plate further includes a carbon fiber layer disposed on the surface of the anti-corrosion layer facing the accommodation space. By disposing the carbon fiber layer on the surface of the anti-corrosion layer facing the accommodation space, on the one hand, the carbon fiber layer can absorb and disperse the energy generated when the bottom guard plate is impacted or squeezed, thus playing a role in relieving stress concentration, enabling the bottom guard plate to better resist deformation when being squeezed or impacted, and improving the toughness of the bottom guard plate. On the other hand, the fibers in the carbon fiber layer are composed of carbon atoms with a stable chemical structure, making the carbon fiber layer have good corrosion resistance and high-temperature resistance, and being able to enhance the overall corrosion resistance and high-temperature resistance of the bottom guard plate. Therefore, the reliability of the battery device can be further improved.

[0021] In some embodiments, the battery box body further includes a frame body connected to the outer peripheral area of the bottom guard plate to form an accommodation space with the bottom guard plate. By connecting the frame body to the outer peripheral area of the bottom guard plate to form an accommodation space with the bottom guard plate, the bottom guard plate can serve as the bottom wall of the battery box body, improving the corrosion resistance, high-temperature resistance, wear resistance, and impact resistance of the bottom wall of the battery box body, thereby improving the reliability of the battery device.

[0022] In a second aspect, the present application provides a bottom guard plate, which includes: a plate body, with an anti-corrosion layer disposed on one side surface of the plate body; and a first polyurea layer disposed on the surface of the plate body facing away from the anti-corrosion layer. By disposing the anti-corrosion layer on one side surface of the plate body and simultaneously disposing the first polyurea layer on the surface of the plate body facing away from the anti-corrosion layer, on the one hand, the first polyurea layer is continuous and dense, being a highly cross-linked network structure, and there are a large number of hydrogen bonds between the polyurea molecular chains of the first polyurea layer. The hydrogen bonds enhance the intermolecular interaction force of the polyurea molecules, improving the overall mechanical properties of the first polyurea layer. The highly cross-linked network structure and hydrogen bonds not only endow the first polyurea layer with extremely high hardness, rigidity, and adhesion, enabling the first polyurea layer to resist external collisions, scratches, and impacts and not being easily detached, improving the mechanical strength, wear resistance, and impact resistance of the bottom guard plate, but also endowing the first polyurea layer with the ability to resist acids, alkalis, neutral salt spray, and high temperatures, making the first polyurea layer not easily corroded and not easily decomposed at high temperatures, improving the corrosion resistance and high-temperature resistance of the bottom guard plate, and thus improving the reliability of the battery device. On the other hand, the anti-corrosion layer can block the contact between substances such as liquids and the plate body, further improving the corrosion resistance of the bottom guard plate. Therefore, the reliability of the battery device can be further improved.

[0023] In some embodiments, the anti-corrosion layer includes one or more of a first coating layer, a first electrophoretic paint layer, an anti-corrosion paint layer, and a second polyurea layer. By disposing one or more of the first coating layer, the first electrophoretic paint layer, the anti-corrosion paint layer, and the second polyurea layer on the surface of the plate body facing the accommodation space, substances such as liquids can be blocked from contacting the plate body, thereby further improving the corrosion resistance of the bottom guard plate, and thus the reliability of the battery device can be further improved.

[0024] In a third aspect, the present application provides an electrical device, which includes: the above-mentioned battery device, or the above-mentioned bottom guard plate.

[0025] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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:

[0027] Figure 1 is a schematic structural diagram of an embodiment of the electrical device provided by the present application;

[0028] Figure 2 is a schematic structural diagram of an embodiment of the battery device provided by the present application;

[0029] Figure 3 is an exploded structural diagram of an embodiment of the battery device provided by the present application;

[0030] Figure 4 is an exploded structural diagram of a first embodiment of the bottom guard plate of the battery device provided by the present application;

[0031] Figure 5 is an exploded structural diagram of a second embodiment of the bottom guard plate of the battery device provided by the present application;

[0032] Figure 6 is an exploded structural diagram of a third embodiment of the bottom guard plate of the battery device provided by the present application;

[0033] Figure 7 is an exploded structural diagram of a fourth embodiment of the bottom guard plate of the battery device provided by the present application;

[0034] Figure 8It is a schematic exploded view of the fifth embodiment of the bottom guard plate of the battery device provided by the present application;

[0035] Figure 9 It is a schematic exploded view of the sixth embodiment of the bottom guard plate of the battery device provided by the present application.

[0036] The reference numerals in the specific embodiments are as follows:

[0037] Vehicle 1000a, battery device 100a, controller 200a, motor 300a, battery cell 10, housing 11, end cover 12, battery box 20, bottom guard plate 21, plate body 211, mounting hole 2111, threaded hole 2111a, steel plate 2112, anti-corrosion layer 212, first coating layer 2121, first electrophoretic paint layer 2122, second polyurea layer 2123, first polyurea layer 213, second coating layer 214, second electrophoretic paint layer 215, carbon fiber layer 216, frame 22, first part 221, second part 222. Specific embodiments

[0038] The embodiments of the technical solution of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0039] 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 description of the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0041] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of this 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 explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[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 there can be three relationships. For example, detector and / or B can represent three situations: the detector exists alone, the detector and B exist simultaneously, and B exists alone. Additionally, in this text, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "plural" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0044] In the description of the embodiments of the present application, for technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated 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. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "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 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.

[0046] With the development of battery device technology, battery devices are applied in more and more fields and are gradually replacing 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, which can provide physical protection for the battery device, especially during vehicle driving, and can reduce or eliminate the damage to the battery device caused by the chassis bumping, scraping against the ground or hitting objects such as gravel.

[0047] In the related art, a polyvinyl chloride coating is usually used as a scratch-resistant layer and a corrosion-resistant layer of the bottom guard plate. However, the scratch-resistant ability of polyvinyl chloride is very limited and it is prone to peeling off when encountering bumps, scratches or impacts with objects such as gravel, resulting in problems such as the bottom guard plate being easily corroded, which affects the reliability of the battery device.

[0048] In view of the above considerations, the present application provides a battery device, a bottom guard plate and an electrical equipment. 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 which is at least used for supporting the battery cells. The bottom guard plate includes a plate body and a first polyurea layer. An anti-corrosion layer is provided on the surface of the plate body facing the accommodation space; the first polyurea layer is provided on the surface of the plate body facing away from the accommodation space. By providing an anti-corrosion layer on the surface of the plate body facing the accommodation space and at the same time providing the first polyurea layer on the surface of the plate body facing away from the accommodation space, on the one hand, the first polyurea layer is continuous and dense, and is a highly cross-linked network structure. There are a large number of hydrogen bonds between the polyurea molecular chains of the first polyurea layer. The hydrogen bonds enhance the interaction between polyurea molecules, which can improve the overall mechanical properties of the first polyurea layer. The highly cross-linked network structure and hydrogen bonds not only endow the first polyurea layer with extremely high hardness, rigidity and adhesion, making the first polyurea layer able to resist external collisions, scratches and impacts and not easy to fall off, which can improve the mechanical strength, wear resistance and impact resistance of the bottom guard plate, but also make the first polyurea layer have the ability to resist acids, alkalis, neutral salt spray and high temperatures, so that the first polyurea layer is not easy to be corroded and not easy to be decomposed at high temperatures, which can improve the corrosion resistance and high temperature resistance of the bottom guard plate, thereby improving the reliability of the battery device; on the other hand, the anti-corrosion layer is provided on the surface of the plate body facing the accommodation space, which can block the contact between liquids and other substances and the plate body, thereby further improving the corrosion resistance of the bottom guard plate, and thus can further improve the reliability of the battery device.

[0049] The battery device, bottom guard plate and electrical equipment disclosed in the embodiments of the present application can be used in electrical equipment using the battery device as a power source or various energy storage systems using 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, etc. 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.

[0050] 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 description.

[0051] Please refer to Figure 1, the vehicle 1000a can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. 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 to supply power to the vehicle 1000a. For example, the battery device 100a can serve 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, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000a.

[0052] In some embodiments of the present application, the battery device 100a can not only serve as the operating power source of the vehicle 1000a, but also serve 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.

[0053] 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.

[0054] 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 cell components for providing voltage and capacity. The battery cell components 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.

[0055] 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.

[0056] 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. The embodiments of the present application do not limit this.

[0057] In some embodiments, the battery device 100a includes the battery cell 10 and a battery box 20 formed with an accommodation space for accommodating the battery cell 10.

[0058] 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 crossbeam and longitudinal beam of the vehicle.

[0059] In some embodiments, at least a part of the battery box 20 can be disposed on the chassis structure of the vehicle 1000a.

[0060] In some embodiments, the battery box body 20 at least includes a bottom guard plate 21. The bottom guard plate 21 can serve as the bottom wall of the battery box body 20. The bottom guard plate 21 can not only be used to support the battery cells 10, but also reduce the risk of damage to the battery box body 20 due to bumping, scratching against the ground or hitting objects such as gravel.

[0061] In some other embodiments, the bottom guard plate 21 can be a component independent of the battery box body 20, arranged close to the bottom wall of the battery box body 20, and disposed on the side of the bottom wall facing away from the accommodation space to support and protect the entire battery box body 20.

[0062] In the embodiments of the present application, the bottom guard plate 21 will be described as an example of the bottom wall of the battery box body 20.

[0063] 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 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 charge and discharge process of the battery device 100a, the positive active substance and the negative active substance react with the electrolyte to form a current loop.

[0064] 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, the 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.

[0065] In some embodiments, please refer to Figure 3 and Figure 4, the battery device includes battery cells 10 and a battery box body 20 formed with an accommodation space for accommodating the battery cells 10. The battery box body 20 at least includes a bottom guard plate 21, and the bottom guard plate 21 is at least used to support the battery cells 10. The bottom guard plate 21 includes a plate body 211 and a first polyurea layer 213. An anti-corrosion layer 212 is provided on the surface of the plate body 211 facing the accommodation space; the first polyurea layer 213 is provided on the surface of the plate body 211 facing away from the accommodation space.

[0066] In some embodiments, by providing the anti-corrosion layer 212 on the surface of the plate body 211 facing the accommodation space, substances such as liquid generated inside the battery box body 20 can be blocked from contacting the plate body 211, reducing the risk of the plate body 211 being corroded by substances such as liquid generated inside the battery box body 20.

[0067] Among them, the first polyurea layer 213 can be provided on the surface of the plate body 211 facing away from the accommodation space by means such as brushing or spraying.

[0068] The material of the first polyurea layer 213 is an elastomeric substance formed by the reaction of an isocyanate component and an amino compound component. In some embodiments, the first polyurea layer 213 has at least one of a flame retardant, a colorant, and an antioxidant. The flame retardant can improve the flame retardant performance of the bottom guard plate 21, reducing risks such as fires caused by overheating of the battery box body 20 or scratching or impact with other objects. By adding a colorant to the first polyurea layer 213, the aesthetics of the bottom guard plate 21 can be improved. By adding an antioxidant to the first polyurea layer 213, the degradation of the first polyurea layer 213 can be inhibited or delayed, improving the durability and stability of the first polyurea layer 213, thereby extending the service life of the bottom guard plate 21.

[0069] By providing an anti-corrosion layer 212 on the surface of the board body 211 facing the accommodation space, and simultaneously providing the first polyurea layer 213 on the surface of the board body 211 facing away from the accommodation space, on the one hand, the first polyurea layer 213 is continuous and dense, being a highly cross-linked network structure, and there are a large number of hydrogen bonds between the polyurea molecular chains of the first polyurea layer 213. The hydrogen bonds enhance the interaction force between the polyurea molecules, which can improve the overall mechanical properties of the first polyurea layer 213. The highly cross-linked network structure and hydrogen bonds not only endow the first polyurea layer 213 with extremely high hardness, rigidity, and adhesion, enabling the first polyurea layer 213 to resist external collisions, scratches, and impacts, and being not easy to fall off, which can improve the mechanical strength, wear resistance, and impact resistance of the bottom guard plate 21, but also enable the first polyurea layer 213 to have the ability to resist acids, alkalis, neutral salt spray, and high temperatures. Thus, the first polyurea layer 213 is not easy to be corroded and is not easy to be decomposed at high temperatures, which can improve the corrosion resistance and high-temperature resistance of the bottom guard plate 21, thereby improving the reliability of the battery device; on the other hand, the anti-corrosion layer 212 is provided on the surface of the board body 211 facing the accommodation space, which can block the contact between liquids and other substances and the board body 211, thereby further improving the corrosion resistance of the bottom guard plate 21, and thus further improving the reliability of the battery device.

[0070] In some embodiments, the thickness of the first polyurea layer 213 is 0.3 mm to 3 mm.

[0071] The thickness of the first polyurea layer 213 can be 0.3 mm, 0.32 mm, 0.38 mm, 0.4 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 first polyurea layer 213 can be selected according to the actual situation, as long as the thickness of the first polyurea layer 213 is within the range of 0.3 mm to 3 mm.

[0072] By making the thickness of the first polyurea layer 213 within the range of 0.3 mm to 3 mm, on the one hand, the thickness of the first polyurea layer 213 is moderate, enabling it to exhibit its excellent corrosion resistance, high temperature resistance, wear resistance, impact resistance and other properties, so that the first polyurea layer 213 can provide a better protection effect for the plate body 211. On the other hand, the usage amount of the first polyurea layer 213 can be saved, and the cost can be reduced.

[0073] In addition, if the thickness of the first polyurea layer 213 is less than 0.3 mm, the thickness below 0.3 mm will result in insufficient thickness of the first polyurea layer 213, making it difficult to resist external collisions, scratches and impacts, thus leading to poor protection effect of the first polyurea layer 213 on the plate body 211. Moreover, the production process of the first polyurea layer 213 is difficult, and it is hard to ensure the thickness consistency and accuracy of the first polyurea layer 213. If the thickness of the first polyurea layer 213 is greater than 3 mm, it will lead to too high cost of the first polyurea layer 213.

[0074] In some embodiments, the thickness of the first polyurea layer 213 is 0.5 mm to 1.5 mm.

[0075] The thickness of the first polyurea layer 213 can be 0.5 mm, 0.515 mm, 0.56 mm, 0.588 mm, 0.62 mm, 0.65 mm, 0.665 mm, 0.69 mm, 0.715 mm, 0.73 mm, 0.77 mm, 0.83 mm, 0.85 mm, 0.866 mm, 0.88 mm, 0.89 mm, 0.925 mm, 0.94 mm, 0.955 mm, 0.97 mm, 1.02 mm, 1.15 mm, 1.18 mm, 1.22 mm, 1.255 mm, 1.258 mm, 1.26 mm, 1.28 mm, 1.3 mm, 1.33 mm, 1.365 mm, 1.38 mm, 1.42 mm, 1.44 mm, 1.47 mm, 1.485 mm, 1.5 mm, etc., but not limited thereto. The specific thickness of the first polyurea layer 213 can be selected according to the actual situation as long as the thickness of the first polyurea layer 213 is within the range of 0.5 mm to 1.5 mm.

[0076] By making the thickness of the first polyurea layer 213 within the range of 0.5 mm to 1.5 mm, not only can the first polyurea layer 213 provide a better protection effect for the plate body 211, but also it can significantly improve the corrosion resistance, high temperature resistance, wear resistance, impact resistance and other properties of the bottom guard plate 21. At the same time, it can also maintain economic rationality, enabling the cost of the bottom guard plate 21 to be controlled within a reasonable range.

[0077] In some embodiments, the pull-out strength of the first polyurea layer 213 is greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the first polyurea layer 213 is less than or equal to 20 mg, the tensile strength of the first polyurea layer 213 is greater than or equal to 10 MPa, and the tear strength of the first polyurea layer 213 is greater than or equal to 10 N / mm.

[0078] Among them, the pull-out strength test can refer to the national standard GB / T 5210, the mass loss test of the wear-resistant coating can refer to the national standard GB / T 1768, the tensile strength test can refer to the national standard GB / T 528, and the tear strength test can refer to the national standard GB / T 529.

[0079] In some embodiments, the pull-out strength of the first polyurea layer 213 can be 1 MPa, 1.35 MPa, 1.5 MPa, 1.88 MPa, 2 MPa, 2.5 MPa, 2.75 MPa, 3 MPa, 3.3 MPa, 3.6 MPa, 3.8 MPa, 4 MPa, 4.5 MPa, 5 MPa, 5.6 MPa, 6 MPa, 6.8 MPa, 7 MPa, 8 MPa, 8.5 MPa, 9 MPa, 10 MPa, etc., but not limited thereto. The specific value of the pull-out strength of the first polyurea layer 213 can be selected according to the actual situation as long as the pull-out strength of the first polyurea layer 213 is greater than or equal to 1 MPa.

[0080] In some embodiments, the mass loss of the wear-resistant coating of the first polyurea layer 213 can be 20 mg, 18 mg, 17 mg, 16.5 mg, 16 mg, 15.55 mg, 15 mg, 14.7 mg, 14.2 mg, 13.8 mg, 13 mg, 12 g, 11 mg, 10 mg, 8 mg, etc., but not limited thereto. The specific value of the mass loss of the wear-resistant coating of the first polyurea layer 213 can be selected according to the actual situation as long as the mass loss of the wear-resistant coating of the first polyurea layer 213 is less than or equal to 20 mg.

[0081] In some embodiments, the tensile strength of the first polyurea layer 213 can be 10 MPa, 11.5 MPa, 12 MPa, 12.5 MPa, 13 MPa, 14.5 MPa, 15.45 MPa, 15.88 MPa, 16 MPa, 16.5 MPa, 17 MPa, 18.5 MPa, 19 MPa, 20 MPa, etc., but not limited thereto. The specific value of the tensile strength of the first polyurea layer 213 can be selected according to the actual situation as long as the tensile strength of the first polyurea layer 213 is greater than or equal to 10 MPa.

[0082] In some embodiments, the tear strength of the first polyurea layer 213 can be 10 N / mm, 12 N / mm, 12.5 N / mm, 12.88 N / mm, 13 N / mm, 13.5 N / mm, 14 N / mm, 14.6 N / mm, 15 N / mm, 15.55 N / mm, 16 N / mm, 17 N / mm, 18 N / mm, 18.5 N / mm, 20 N / mm, etc., but not limited thereto. The specific value of the tear strength of the first polyurea layer 213 can be selected according to the actual situation, as long as the tear strength of the first polyurea layer 213 is greater than or equal to 10 N / mm.

[0083] By making the pull-out strength of the first polyurea layer 213 greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the first polyurea layer 213 less than or equal to 20 mg, the tensile strength of the first polyurea layer 213 greater than or equal to 10 MPa, and the tear strength of the first polyurea layer 213 greater than or equal to 10 N / mm, the first polyurea layer 213 can exhibit its excellent corrosion resistance, high temperature resistance, wear resistance, and impact resistance, etc., so that the first polyurea layer 213 can provide a better protection effect on the plate body 211.

[0084] In some embodiments, the anti-corrosion layer 212 includes one or more of a first coating layer 2121, a first electrophoretic paint layer 2122, an anti-corrosion paint layer, and a second polyurea layer 2123.

[0085] In some embodiments, the anti-corrosion layer 212 includes a first coating layer 2121. The first coating layer 2121 can be formed on the surface of the plate body 211 facing the accommodation space by hot dip coating, electroplating, infiltration plating, etc.

[0086] In some embodiments, the anti-corrosion layer 212 includes a first electrophoretic paint layer 2122. The first electrophoretic paint layer 2122 is disposed on the surface of the plate body 211 facing the accommodation space through an electrophoretic process.

[0087] In some embodiments, the anti-corrosion layer 212 includes an anti-corrosion paint layer. The material of the anti-corrosion paint layer includes but is not limited to epoxy resin anti-corrosion coating, rubber resin anti-corrosion coating, modified resin anti-corrosion coating, polyurethane anti-corrosion coating, acrylate anti-corrosion coating, or inorganic zinc-rich anti-corrosion coating. The anti-corrosion paint layer can be disposed on the surface of the plate body 211 facing the accommodation space by spraying, roll coating, dip coating, or brushing.

[0088] In some embodiments, the anti-corrosion layer 212 includes a second polyurea layer 2123. The second polyurea layer 2123 is an elastomeric substance formed by the reaction of an isocyanate component and an amino compound component. The second polyurea layer 2123 has extremely high hardness, rigidity, and adhesion, can resist collisions, scratches, and impacts of components such as the battery cell 10 inside the battery device, is not easy to fall off, can improve the mechanical strength, wear resistance, and impact resistance of the bottom guard plate 21. At the same time, the second polyurea layer 2123 has the ability to resist acids, alkalis, neutral salt spray, and high temperatures, is not easy to be corroded, and is not easy to be decomposed at high temperatures, can improve the corrosion resistance and high-temperature resistance of the bottom guard plate 21, thereby improving the reliability of the battery device.

[0089] In some embodiments, the second polyurea layer 2123 contains at least one of a flame retardant, a colorant, and an antioxidant. The color of the colorant in the second polyurea layer 2123 may be different from the color of the colorant in the first polyurea layer 213, which is convenient for users to distinguish the surface of the bottom guard plate 21 facing the accommodation space and the surface facing away from the accommodation space through the color of the colorant, and can improve the assembly efficiency of the battery box 20 and the battery device. Of course, the color of the colorant in the second polyurea layer 2123 may also be the same as the color of the colorant in the first polyurea layer 213.

[0090] In some embodiments, the anti-corrosion layer 212 includes a first coating layer 2121 and a first electrophoretic paint layer 2122; or the anti-corrosion layer 212 includes a first coating layer 2121 and an anti-corrosion paint layer; or the anti-corrosion layer 212 includes a first coating layer 2121 and a second polyurea layer 2123; or the anti-corrosion layer 212 may be a first coating layer 2121, a first electrophoretic paint layer 2122, an anti-corrosion paint layer, and a second polyurea layer 2123.

[0091] By disposing one or more of the first coating layer 2121, the first electrophoretic paint layer 2122, the anti-corrosion paint layer, and the second polyurea layer 2123 on the surface of the plate body 211 facing the accommodation space, substances such as liquids can be blocked from contacting the plate body 211, thereby further improving the corrosion resistance of the bottom guard plate 21, and thus further improving the reliability of the battery device 100a.

[0092] In some embodiments, please refer to Figure 5 together, the plate body 211 includes a steel plate 2112, the anti-corrosion layer 212 includes a first coating layer 2121, the bottom guard plate 21 further includes a second coating layer 214, the first coating layer 2121 is disposed on the surface of the steel plate 2112 facing the accommodation space, the second coating layer 214 is disposed on the surface of the steel plate 2112 facing away from the accommodation space, and the first polyurea layer 213 is disposed on the surface of the second coating layer 214 facing away from the steel plate 2112.

[0093] The steel plate 2112 has strong impact resistance and is not prone to deformation and fracture. The steel plate 2112 is the main body part of the plate body 211. Using the steel plate 2112 as the main body part of the plate body 211 enables the bottom guard plate 21 to effectively resist external impacts when the chassis of the vehicle 1000a collides with, scratches against the ground, or impacts objects such as gravel, without deformation or fracture, and without squeezing the battery cell 10, thus protecting the safety of the battery cell 10 and improving the reliability of the battery box 20 and the battery pack 100a.

[0094] In some embodiments, the steel plate 2112 can be any one of carbon steel, manganese steel, carbon manganese steel, and bainitic high-strength steel.

[0095] Among them, the second coating layer 214 can be formed on the surface of the steel plate 2112 facing away from the accommodating space by hot dip plating, electroplating, infiltration plating, etc.

[0096] The surface of the steel plate 2112 facing away from the accommodating space is the outer surface of the steel plate 2112 and is also the surface most vulnerable to external impacts. By providing the second coating layer 214 and the first polyurea layer 213 on the surface of the steel plate 2112 facing away from the accommodating space, the second coating layer 214 and the first polyurea layer 213 can provide double protection for the surface of the steel plate 2112 facing away from the accommodating space, thereby improving the structural strength and impact resistance of the surface of the steel plate 2112 facing away from the accommodating space, reducing the risk of deformation or cracking of the bottom guard plate 21 when subjected to external impacts, and thus improving the reliability of the battery device 100a.

[0097] By providing the first coating layer 2121 on the surface of the steel plate 2112 facing the accommodating space, the second coating layer 214 on the surface of the steel plate 2112 facing away from the accommodating space, and the first polyurea layer 213 on the surface of the second coating layer 214 facing away from the steel plate 2112, on the one hand, the first coating layer 2121 and the second coating layer 214 wrap the outer surface of the steel plate 2112, which can block the contact between substances such as liquids and the steel plate 2112 and reduce the risk of corrosion of the steel plate 2112. On the other hand, the second coating layer 214 and the first polyurea layer 213 can provide double protection for the surface of the steel plate 2112 facing away from the accommodating space, thereby improving the structural strength and impact resistance of the surface of the steel plate 2112 facing away from the accommodating space, reducing the risk of deformation or cracking of the bottom guard plate 21 when subjected to external impacts, and thus improving the reliability of the battery device 100a.

[0098] In some embodiments, the first coating layer 2121 includes a galvanized layer or a galvanized magnesium aluminum layer, and the second coating layer 214 includes a galvanized layer or a galvanized magnesium aluminum layer. The galvanized layer can be formed by hot dip plating, electroplating, infiltration plating, etc., and the galvanized magnesium aluminum layer can be formed by hot dip plating.

[0099] In some embodiments, the first coating layer 2121 and / or the second coating layer 214 may be a galvanized layer. The galvanized layer provided on the surface of the steel plate 2112 can prevent substances such as liquids from contacting the steel plate 2112. When the first coating layer 2121 and / or the second coating layer 214 are damaged, a primary battery will be formed between the galvanized layer and the steel plate 2112 in a humid environment. Among them, the galvanized layer, as the anode, is preferentially corroded, and the steel plate 2112, as the cathode, is protected, thus playing a role in alleviating the corrosion of the steel plate 2112. At the same time, 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 thus improving the overall corrosion resistance of the bottom guard plate 21.

[0100] In some embodiments, the first coating layer 2121 and / or the second coating layer 214 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 provided on the surface of the steel plate 2112 can prevent substances such as liquids from contacting the steel plate 2112. When the first coating layer 2121 and / or the second coating layer 214 are damaged, a primary battery will be formed between zinc and the steel plate 2112 in a humid environment. Among them, zinc, as the anode, is preferentially corroded, and the steel plate 2112, as the cathode, is protected. This sacrificial anode protection effectively alleviates the corrosion rate of the steel plate 2112 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 steel plate 2112, and further enhancing the corrosion resistance of the steel plate 2112, making the corrosion resistance of the bottom guard plate 21 further improved.

[0101] 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.

[0102] In some embodiments, please refer to Figure 6 , the first coating layer 2121 includes a galvanized layer, the second coating layer 214 includes a galvanized layer, the anti-corrosion layer 212 further includes a first electrophoretic paint layer 2122, the bottom guard plate 21 further includes a second electrophoretic paint layer 215, the first electrophoretic paint layer 2122 is provided on the surface of the first coating layer 2121 facing away from the steel plate 2112, and the second electrophoretic paint layer 215 is provided between the first polyurea layer 213 and the second coating layer 214.

[0103] Among them, the first coating layer 2121 includes a galvanized layer, and the second coating layer 214 includes a galvanized layer. The galvanized layer wraps around the outer surface of the steel plate 2112. The first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 are disposed on the surface of the corresponding galvanized layer facing away from the steel plate 2112. That is, the galvanized layer and the first electrophoretic paint layer 2122 are sequentially disposed on the surface of the steel plate 2112 facing the accommodation space, and the galvanized layer and the second electrophoretic paint layer 215 are sequentially disposed on the surface of the steel plate 2112 facing away from the accommodation space, which can meet the test requirements of no red rust in salt spray test for more than 720 hours.

[0104] In some embodiments, the galvanized layer can be replaced by a galvanized magnesium aluminum layer, and at the same time, the setting of the first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 is cancelled. That is, the first coating layer 2121 includes a galvanized magnesium aluminum layer, and the second coating layer 214 includes a galvanized magnesium aluminum layer. The galvanized magnesium aluminum layer wraps around the outer surface of the steel plate 2112, which can meet the test requirements of no red rust in salt spray test for more than 720 hours.

[0105] Among them, the first electrophoretic paint layer 2122 is formed on the surface of the first coating layer 2121 facing away from the steel plate 2112 through an electrophoretic process, and the second electrophoretic paint layer 215 is formed on the surface of the second coating layer 214 facing away from the steel plate 2112 through an electrophoretic process.

[0106] In some embodiments, before the first electrophoretic paint layer 2122 is formed on the surface of the first coating layer 2121 facing away from the steel plate 2112 through an electrophoretic process, and the second electrophoretic paint layer 215 is formed on the surface of the second coating layer 214 facing away from the steel plate 2112 through an electrophoretic process, the dirt on the surfaces of the first coating layer 2121 and the second coating layer 214 can be removed by treatment methods such as degreasing, pickling, and phosphatization, so as to improve the adhesion between the first electrophoretic paint layer 2122 and the first coating layer 2121 and the adhesion between the second electrophoretic paint layer 215 and the second coating layer 214, making the first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 not easy to peel off.

[0107] The material of the first electrophoretic paint layer 2122 includes but is not limited to anti-corrosion materials such as epoxy resin, rubber resin, modified resin, polyurethane, acrylate, inorganic zinc-rich, polyethylene, or polypropylene. The material of the second electrophoretic paint layer 215 includes but is not limited to anti-corrosion materials such as epoxy resin, rubber resin, modified resin, polyurethane, acrylate, inorganic zinc-rich, polyethylene, or polypropylene. The material of the first electrophoretic paint layer 2122 and the material of the second electrophoretic paint layer 215 can be the same. Of course, the material of the first electrophoretic paint layer 2122 and the material of the second electrophoretic paint layer 215 can also be different. The first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 have the advantages of high density and high hardness, and can further improve the wear resistance and corrosion resistance of the bottom guard plate 21.

[0108] By disposing the first electrophoretic paint layer 2122 on the surface of the first coating layer 2121 facing away from the steel plate 2112 and disposing the second electrophoretic paint layer 215 between the first polyurea layer 213 and the second coating layer 214, on the one hand, the first coating layer 2121 and the first electrophoretic paint layer 2122 can provide double protection for the surface of the steel plate 2112 facing the accommodation space, and can further improve the corrosion resistance of the side of the bottom guard plate 21 facing the accommodation space; on the other hand, the surface roughness of the second electrophoretic paint layer 215 is controllable, and the adhesion between the first polyurea layer 213 and the second electrophoretic paint layer 215 can be adjusted by adjusting the surface roughness of the second electrophoretic paint layer 215, so as to improve the connection strength between the first polyurea layer 213 and the second electrophoretic paint layer 215, and further improve the corrosion resistance, high temperature resistance, mechanical strength, wear resistance and impact resistance of the bottom guard plate 21.

[0109] In some embodiments, please refer to Figure 7 , the anticorrosion layer 212 further includes a second polyurea layer 2123, and the second polyurea layer 2123 is disposed on the surface of the first coating layer 2121 facing away from the steel plate 2112.

[0110] By disposing the second polyurea layer 2123 on the surface of the first coating layer 2121 facing away from the steel plate 2112, the second polyurea layer 2123 and the first coating layer 2121 can provide double protection for the surface of the steel plate 2112 facing the accommodation space, which can not only further improve the mechanical strength of the side of the bottom guard plate 21 facing the accommodation space, thereby improving the supporting ability of the bottom guard plate 21 for the battery cell 10, but also further improve the corrosion resistance and high temperature resistance of the bottom guard plate 21.

[0111] In some embodiments, please refer to Figure 8 , the second polyurea layer 2123 can be disposed on the side of the first electrophoretic paint layer 2122 facing away from the first coating layer 2121. The surface roughness of the first electrophoretic paint layer 2122 is controllable, and the adhesion between the second polyurea layer 2123 and the first electrophoretic paint layer 2122 can be adjusted by adjusting the surface roughness of the first electrophoretic paint layer 2122, so as to improve the connection strength between the second polyurea layer 2123 and the first electrophoretic paint layer 2122, and further improve the corrosion resistance, high temperature resistance, mechanical strength, wear resistance and impact resistance of the bottom guard plate 21.

[0112] In some embodiments, the thickness of the second polyurea layer 2123 is 0.3 mm to 3 mm.

[0113] The thickness of the second polyurea layer 2123 can be 0.3 mm, 0.32 mm, 0.38 mm, 0.4 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 second polyurea layer 2123 can be selected according to the actual situation, as long as the thickness of the second polyurea layer 2123 is within the range of 0.3 mm to 3 mm.

[0114] By making the thickness of the second polyurea layer 2123 within the range of 0.3 mm to 3 mm, on the one hand, the thickness of the second polyurea layer 2123 is moderate, and its excellent corrosion resistance, high temperature resistance, wear resistance, and impact resistance and other properties can be exerted, so that the second polyurea layer 2123 can play a better protective effect on the plate body 211, thereby improving the support effect of the bottom guard plate 21 on the battery cell 10. On the other hand, the usage amount of the second polyurea layer 2123 can be saved, and the cost can be reduced.

[0115] In addition, if the thickness of the second polyurea layer 2123 is less than 0.3 mm, the thickness below 0.3 mm will cause the thickness of the second polyurea layer 2123 to be insufficient, making it difficult to resist the impact inside the battery device 100a, resulting in a poor protective effect of the second polyurea layer 2123 on the plate body 211, and the production process of the second polyurea layer 2123 is difficult, and the thickness consistency and accuracy are difficult to guarantee; if the thickness of the second polyurea layer 2123 is greater than 3 mm, it will result in too high a cost of the second polyurea layer 2123.

[0116] In some embodiments, the thickness of the second polyurea layer 2123 is 0.5 mm to 1.5 mm.

[0117] The thickness of the second polyurea layer 2123 can be 0.5mm, 0.515mm, 0.56mm, 0.588mm, 0.62mm, 0.65mm, 0.665mm, 0.69mm, 0.715mm, 0.73mm, 0.77mm, 0.83mm, 0.85mm, 0.866mm, 0.88mm, 0.89mm, 0.925mm, 0.94mm, 0.955mm, 0.97mm, 1.02mm, 1.15mm, 1.18mm, 1.22mm, 1.255mm, 1.258mm, 1.26mm, 1.28mm, 1.3mm, 1.33mm, 1.365mm, 1.38mm, 1.42mm, 1.44mm, 1.47mm, 1.485mm, 1.5mm, etc., but not limited to this. The specific thickness of the second polyurea layer 2123 can be selected according to the actual situation, as long as the thickness of the second polyurea layer 2123 is within the range of 0.5mm to 1.5mm.

[0118] By making the thickness of the second polyurea layer 2123 within the range of 0.5mm to 1.5mm, not only can the second polyurea layer 2123 provide a better protection effect on the plate body 211, but also can significantly improve the corrosion resistance, high temperature resistance, wear resistance, and impact resistance of the bottom guard plate 21. At the same time, it can also maintain economic rationality, so that the cost of the bottom guard plate 21 can be controlled within a reasonable range.

[0119] In some embodiments, the pull-out strength of the second polyurea layer 2123 is greater than or equal to 1MPa, the mass loss of the wear-resistant coating of the second polyurea layer 2123 is less than or equal to 20mg, the tensile strength of the second polyurea layer 2123 is greater than or equal to 10MPa, and the tear strength of the second polyurea layer 2123 is greater than or equal to 10N / mm.

[0120] Among them, the pull-out strength test can refer to the national standard GB / T 5210, the mass loss test of the wear-resistant coating can refer to the national standard GB / T 1768, the tensile strength test can refer to the national standard GB / T 528, and the tear strength test can refer to the national standard GB / T 529.

[0121] In some embodiments, the pull-out strength of the second polyurea layer 2123 can be 1 MPa, 1.35 MPa, 1.5 MPa, 1.88 MPa, 2 MPa, 2.5 MPa, 2.75 MPa, 3 MPa, 3.3 MPa, 3.6 MPa, 3.8 MPa, 4 MPa, 4.5 MPa, 5 MPa, 5.6 MPa, 6 MPa, 6.8 MPa, 7 MPa, 8 MPa, 8.5 MPa, 9 MPa, 10 MPa, etc., but not limited thereto. The specific value of the pull-out strength of the second polyurea layer 2123 can be selected according to the actual situation, as long as the pull-out strength of the second polyurea layer 2123 is greater than or equal to 1 MPa.

[0122] In some embodiments, the mass loss of the wear-resistant coating of the second polyurea layer 2123 can be 20 mg, 18 mg, 17 mg, 16.5 mg, 16 mg, 15.55 mg, 15 mg, 14.7 mg, 14.2 mg, 13.8 mg, 13 mg, 12 g, 11 mg, 10 mg, 8 mg, etc., but not limited thereto. The specific value of the mass loss of the wear-resistant coating of the second polyurea layer 2123 can be selected according to the actual situation, as long as the mass loss of the wear-resistant coating of the second polyurea layer 2123 is less than or equal to 20 mg.

[0123] In some embodiments, the tensile strength of the second polyurea layer 2123 can be 10 MPa, 11.5 MPa, 12 MPa, 12.5 MPa, 13 MPa, 14.5 MPa, 15.45 MPa, 15.88 MPa, 16 MPa, 16.5 MPa, 17 MPa, 18.5 MPa, 19 MPa, 20 MPa, etc., but not limited thereto. The specific value of the tensile strength of the second polyurea layer 2123 can be selected according to the actual situation, as long as the tensile strength of the second polyurea layer 2123 is greater than or equal to 10 MPa.

[0124] In some embodiments, the tear strength of the second polyurea layer 2123 can be 10 N / mm, 12 N / mm, 12.5 N / mm, 12.88 N / mm, 13 N / mm, 13.5 N / mm, 14 N / mm, 14.6 N / mm, 15 N / mm, 15.55 N / mm, 16 N / mm, 17 N / mm, 18 N / mm, 18.5 N / mm, 20 N / mm, etc., but not limited thereto. The specific value of the tear strength of the second polyurea layer 2123 can be selected according to the actual situation, as long as the tear strength of the second polyurea layer 2123 is greater than or equal to 10 N / mm.

[0125] By making the pull-out strength of the second polyurea layer 2123 greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the second polyurea layer 2123 less than or equal to 20 mg, the tensile strength of the second polyurea layer 2123 greater than or equal to 10 MPa, and the tear strength of the second polyurea layer 2123 greater than or equal to 10 N / mm, the second polyurea layer 2123 can exhibit its excellent corrosion resistance, high temperature resistance, wear resistance, impact resistance and other properties, so that the second polyurea layer 2123 can provide a better protection effect on the plate body 211.

[0126] In some embodiments, the sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 is 0.5 mm to 2.5 mm.

[0127] The sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 can be 0.5 mm, 0.52 mm, 0.55 mm, 0.58 mm, 0.6 mm, 0.635 mm, 0.66 mm, 0.68 mm, 0.72 mm, 0.75 mm, 0.77 mm, 0.785 mm, 0.8 mm, 0.85 mm, 0.88 mm, 0.9 mm, 0.96 mm, 1 mm, 1.2 mm, 1.35 mm, 1.4 mm, 1.47 mm, 1.53 mm, 1.55 mm, 1.6 mm, 1.66 mm, 1.7 mm, 1.756 mm, 1.8 mm, 1.85 mm, 1.9 mm, 1.95 mm, 2 mm, 2.2 mm, 2.35 mm, 2.4 mm, 2.45 mm, 2.5 mm, etc., but not limited thereto. The specific value of the sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 can be selected according to the actual situation, as long as the sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 is within the range of 0.5 mm to 2.5 mm.

[0128] By making the sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 within the range of 0.5 mm to 2.5 mm, on the one hand, the bottom guard plate 21 has sufficient strength, hardness and toughness, is not easy to deform or break, and can improve the support effect 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 and other aspects of the vehicle 1000a.

[0129] In addition, if the sum of the thicknesses of the board body 211, the first coating layer 2121, and the second coating layer 214 is less than 0.5 mm, a thickness below 0.5 mm will result in insufficient mechanical strength of the bottom guard plate 21, causing the bottom guard plate 21 to be unable to withstand external collisions, scratches, and impacts well, and being prone to risks such as deformation or fracture, increasing the risk of damage to the battery cell 10 and affecting the reliability of the battery cell 10; if the sum of the thicknesses of the board body 211, the first coating layer 2121, and the second coating layer 214 is greater than 2.5 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. At the same time, it may also cause the distance between the vehicle 1000a and the ground to decrease, thereby increasing the risks of scratching or colliding with the road surface or other obstacles for the vehicle 1000a.

[0130] In some embodiments, the sum of the thicknesses of the board body 211, the first coating layer 2121, and the second coating layer 214 is 0.7 mm to 1.5 mm.

[0131] The sum of the thicknesses of the board body 211, the first coating layer 2121, and the second coating layer 214 can be 0.7 mm, 0.73 mm, 0.755 mm, 0.788 mm, 0.95 mm, 0.82 mm, 0.83 mm, 0.86 mm, 0.875 mm, 0.89 mm, 0.925 mm, 0.94 mm, 0.955 mm, 0.97 mm, 1.05 mm, 1.15 mm, 1.18 mm, 1.22 mm, 1.232 mm, 1.255 mm, 1.26 mm, 1.28 mm, 1.3 mm, 1.33 mm, 1.365 mm, 1.38 mm, 1.42 mm, 1.44 mm, 1.47 mm, 1.485 mm, 1.5 mm, etc., but not limited thereto. The specific value of the sum of the thicknesses of the board body 211, the first coating layer 2121, and the second coating layer 214 can be selected according to the actual situation, as long as the sum of the thicknesses of the board body 211, the first coating layer 2121, and the second coating layer 214 is within the range of 0.7 mm to 1.5 mm.

[0132] By making the sum of the thicknesses of the board body 211, the first coating layer 2121, and the second coating layer 214 within the range of 0.7 mm to 1.5 mm, not only does the bottom guard plate 21 have sufficient strength, hardness, and toughness, and is not prone to deformation or fracture, but also the bottom guard plate 21 is lighter in weight, has less impact on the endurance and energy consumption of the vehicle 1000a, and can also reduce the risks of scratching or colliding between the chassis of the vehicle 1000a and the road surface or other obstacles.

[0133] In some embodiments, please continue to refer to Figures 2 to 8, the plate body 211 is provided with mounting holes 2111, the first polyurea layer 213 and the second polyurea layer 2123 avoid the mounting holes 2111, and the first electrophoretic paint layer 2122 and / or the anti-corrosion paint layer is arranged on the inner wall of the mounting holes 2111.

[0134] The mounting holes 2111 can be threaded holes 2111a and / or hanging holes on the hanging part. Among them, the threaded holes 2111a are formed on the plate body 211. The threaded holes 2111a can be used to cooperate with fixing components to mount the bottom guard plate 21 on the frame 22 of the battery box body 20. The threaded holes 2111a can penetrate the surface of the steel plate 2112 facing the accommodation space and the surface facing away from the accommodation space. The hanging part is fixed or integrally formed on the surface of the plate body 211 facing the accommodation space and / or the surface of the plate body 211 facing away from the accommodation space. The hanging holes are formed in the hanging part. The hanging holes can be used to cooperate with fixing components to mount the bottom guard plate 21 on the housing 11 of the battery cell 10 and / or the electrical equipment. Among them, the fixing components include but are not limited to screws, bolts, studs or rivets.

[0135] During the preparation process of the bottom guard plate 21, the first coating layer 2121 and the second coating layer 214 are preferentially arranged on the steel plate 2112, and then the mounting holes 2111 are formed. The mounting holes 2111 penetrate the steel plate 2112, the first coating layer 2121 and the second coating layer 214, and then the first electrophoretic paint layer 2122 is arranged. The first electrophoretic paint layer 2122 does not need to avoid the mounting holes 2111, so that the inner wall of the mounting holes 2111 is formed with the first electrophoretic paint layer 2122 to alleviate the problem of corrosion of the inner wall of the mounting holes 2111; or, an anti-corrosion paint layer can be applied on the first electrophoretic paint layer 2122 on the inner wall of the mounting holes 2111 to form double protection for the inner wall of the mounting holes 2111. The first polyurea layer 213 is formed on the surface of the bottom guard plate 21 facing away from the accommodation space, and the second polyurea layer 2123 is formed on the surface of the bottom guard plate 21 facing the accommodation space. The first polyurea layer 213 and the second polyurea layer 2123 can avoid the mounting holes 2111 by covering the mounting holes 2111, so that the setting of the first polyurea layer 213 and the second polyurea layer 2123 will not affect the inner diameter of the mounting holes 2111, so that the inner diameter of the mounting holes 2111 can be adapted to the outer diameter of the fixing components.

[0136] In some embodiments, the hanging part is fixed or integrally formed on the surface of the plate body 211 facing the accommodation space, and at least one of the first coating layer 2121, the first electrophoretic paint layer 2122 and the anti-corrosion paint layer is arranged on the surface of the hanging part.

[0137] In some embodiments, the hanging part is fixed or integrally formed on the surface of the plate body 211 facing away from the accommodation space. At least one of the second coating layer 214, the second electrophoretic paint layer 215 and the anti-corrosion paint layer is arranged on the surface of the hanging part.

[0138] By disposing the first electrophoretic paint layer 2122 and / or the anticorrosive paint layer on the inner wall of the mounting hole 2111, and at the same time avoiding the mounting hole 2111 for the first polyurea layer 213 and the second polyurea layer 2123, on the one hand, the setting of the first polyurea layer 213 and the second polyurea layer 2123 will not affect the inner diameter of the mounting hole 2111, so that the inner diameter of the mounting hole 2111 can be adapted to the outer diameter of the fixing component, and on the other hand, the corrosion of the inner wall of the mounting hole 2111 can be alleviated.

[0139] In some embodiments, the second polyurea layer 2123 avoids the mounting hole 2111, and the second electrophoretic paint layer 215 and / or the anticorrosive paint layer are disposed on the inner wall of the mounting hole 2111.

[0140] In some embodiments, please refer to Figure 9 , the bottom guard plate 21 further includes a carbon fiber layer 216, and the carbon fiber layer 216 is disposed on the surface of the anticorrosive layer 212 facing the accommodation space.

[0141] Among them, the carbon fiber layer 216 can be disposed on the surface of the anticorrosive layer 212 facing the accommodation space through adhesives such as epoxy resin, polyimide resin, bismaleimide resin or phenolic resin, and is pressurized and cured so that the adhesive can be evenly distributed and fully cured, thereby enhancing the connection strength between the carbon fiber layer 216 and the anticorrosive layer 212.

[0142] By disposing the carbon fiber layer 216 on the surface of the anticorrosive layer 212 facing the accommodation space, on the one hand, the carbon fiber layer 216 can absorb and disperse the energy generated when the bottom guard plate 21 is impacted or squeezed, thereby playing a role in alleviating stress concentration, so that the bottom guard plate 21 can better resist deformation when being squeezed or impacted, and can improve the toughness of the bottom guard plate 21. On the other hand, the fibers in the carbon fiber layer 216 are composed of carbon atoms, and the chemical structure is stable, so that the carbon fiber layer 216 has good corrosion resistance and high temperature resistance, and can improve the overall corrosion resistance and high temperature resistance of the bottom guard plate 21. Therefore, the reliability of the battery device 100a can be further improved.

[0143] In addition, the carbon fiber layer 216 has good thermal conductivity and can conduct the heat generated by the battery cell 10, so that the heat generated by the battery cell 10 will not accumulate on the bottom guard plate 21, which can improve the reliability of the battery device 100a. At the same time, the carbon fiber layer 216 is light in weight and can reduce the weight of the bottom guard plate 21, thereby improving the energy utilization efficiency and endurance of the battery device 100a.

[0144] In some embodiments, please continue to refer to Figures 2 to 3 , the battery box body 20 further includes a frame body 22, and the frame body 22 is connected to the outer peripheral region of the bottom guard plate 21 to form an accommodation space with the bottom guard plate 21.

[0145] In some embodiments, the frame 22 may include a first part 221 and a second part 222. The first part 221 may be a hollow structure with openings formed at both ends, and the second part 222 may be a hollow structure with an opening at one end or a plate-like structure. The second part 222 covers the opening at one end of the first part 221, and the bottom guard plate 21 covers the opening at the other end of the first part 221 to form a receiving space. The bottom guard plate 21 serves as the bottom wall of the battery box 20 and is used to support and protect the battery cells 10.

[0146] By connecting the frame 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 20, and the corrosion resistance, high temperature resistance, wear resistance, and impact resistance of the bottom wall of the battery box 20 can be improved, thereby improving the reliability of the battery device.

[0147] In some embodiments, the battery box 20 further includes a frame 22 and a bottom case. The frame 22 is connected to the outer peripheral area of the bottom case to form a receiving space with the bottom case, and the bottom guard plate 21 is provided on the side of the bottom case facing away from the receiving space.

[0148] In some embodiments, please continue to refer to Figures 2 to 3 , the frame 22 may include a first part 221, a second part 222, and a bottom case (not shown in the figure). The first part 221 is a hollow structure with openings formed at both ends, and the second part 222 may be a hollow structure with an opening at one end or a plate-like structure. The second part 222 covers the opening at one end of the first part 221, and the bottom case covers the opening at the other end of the first part 221. Among them, the first part 221 and the bottom case may be fixedly combined together by welding, bolt connection, bonding, etc. In some other embodiments, the first part 221 and the bottom case are an integrally formed structure, and the first part 221 and the bottom case may be integrally formed by forging, stamping, etc. An opening is formed at one end of the first part 221 away from the bottom case, and the second part 222 may be a hollow structure with an opening at one end or a plate-like structure, and the second part 222 covers the opening of the first part 221.

[0149] In some embodiments, the mounting holes 2111 on the bottom guard plate 21 can be used to cooperate with fixing components to mount the bottom guard plate 21 on the bottom case of the battery box 20.

[0150] By providing the bottom guard plate 21 on the side of the bottom case facing away from the receiving space, the structural strength, impact resistance, and toughness of the bottom case of the battery box 20 can be improved, and the risk of deformation of the bottom case of the battery box 20 when being impacted or squeezed can be reduced, thereby improving the reliability of the battery device 100a.

[0151] In some embodiments, such as Figure 4As shown, a first polyurea layer 213 is provided on the surface of the plate body 211 facing away from the accommodating space, and the thickness of the first polyurea layer 213 is 0.3 mm to 3 mm. An anti-corrosion layer 212 is provided on the surface of the plate body 211 facing the accommodating space. The anti-corrosion layer 212 includes a first coating layer 2121, a first electrophoretic paint layer 2122, an anti-corrosion paint layer or a second polyurea layer 2123. The first coating layer 2121 is a galvanized layer or a galvanized magnesium-aluminum layer. When the anti-corrosion layer 212 is the first coating layer 2121, an anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111. When the anti-corrosion layer 212 is the first electrophoretic paint layer 2122, the first electrophoretic paint layer 2122 is provided on the inner wall of the mounting hole 2111. When the anti-corrosion layer 212 is the anti-corrosion paint layer, an anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111. When the anti-corrosion layer 212 is the second polyurea layer 2123, an anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111.

[0152] In some embodiments, as Figure 5 shown, a first coating layer 2121 is provided on the surface of the plate body 211 facing the accommodating space, a second coating layer 214 is provided on the surface of the plate body 211 facing away from the accommodating space, and a first polyurea layer 213 is provided on the surface of the second coating layer 214 facing away from the plate body 211. Among them, both the first coating layer 2121 and the second coating layer 214 are galvanized layers, and the sum of the thicknesses of the plate body 211, the first coating layer 2121, and the second coating layer 214 is 0.5 mm to 2.5 mm, and the thickness of the first polyurea layer 213 is 0.3 mm to 3 mm. An anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111.

[0153] In some embodiments, as Figure 5 shown, a first coating layer 2121 is provided on the surface of the plate body 211 facing the accommodating space, a second coating layer 214 is provided on the surface of the plate body 211 facing away from the accommodating space, and a first polyurea layer 213 is provided on the surface of the second coating layer 214 facing away from the plate body 211. Among them, both the first coating layer 2121 and the second coating layer 214 are galvanized aluminum-magnesium layers, and the sum of the thicknesses of the plate body 211, the first coating layer 2121, and the second coating layer 214 is 0.5 mm to 2.5 mm, and the thickness of the first polyurea layer 213 is 0.3 mm to 3 mm. An anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111.

[0154] In some embodiments, as Figure 6As shown, a first coating layer 2121 is provided on the surface of the plate body 211 facing the accommodation space. A first electrophoretic paint layer 2122 is provided on the surface of the first coating layer 2121 facing away from the plate body 211. A second coating layer 214 is provided on the surface of the plate body 211 facing away from the accommodation space. And a second electrophoretic paint layer 215 is provided on the surface of the second coating layer 214 facing away from the plate body 211. A first polyurea layer 213 is provided on the surface of the second electrophoretic paint layer 215 facing away from the plate body 211. Among them, both the first coating layer 2121 and the second coating layer 214 are galvanized layers. The sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 is 0.5 mm to 2.5 mm, and the thickness of the first polyurea layer 213 is 0.3 mm to 3 mm. The inner wall of the mounting hole 2111 is provided with the first electrophoretic paint layer 2122 or the second electrophoretic paint layer 215; or, the inner wall of the mounting hole 2111 is provided with the first electrophoretic paint layer 2122 and an anti-corrosion paint layer; or, the inner wall of the mounting hole 2111 is provided with the second electrophoretic paint layer 215 and an anti-corrosion paint layer.

[0155] In some embodiments, as Figure 7 shown, a first coating layer 2121 is provided on the surface of the plate body 211 facing the accommodation space. A second polyurea layer 2123 is provided on the surface of the first coating layer 2121 facing away from the plate body 211. A second coating layer 214 is provided on the surface of the plate body 211 facing away from the accommodation space. A first polyurea layer 213 is formed on the surface of the second coating layer 214 facing away from the plate body 211. Among them, both the first coating layer 2121 and the second coating layer 214 are galvanized layers. The sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 is 0.5 mm to 2.5 mm, and the thicknesses of both the first polyurea layer 213 and the second polyurea layer 2123 are 0.3 mm to 3 mm. The inner wall of the mounting hole 2111 is provided with an anti-corrosion paint layer.

[0156] In some embodiments, as Figure 7 shown, a first coating layer 2121 is provided on the surface of the plate body 211 facing the accommodation space. A second polyurea layer 2123 is provided on the surface of the first coating layer 2121 facing away from the plate body 211. A second coating layer 214 is provided on the surface of the plate body 211 facing away from the accommodation space. A first polyurea layer 213 is formed on the surface of the second coating layer 214 facing away from the plate body 211. Among them, both the first coating layer 2121 and the second coating layer 214 are galvanized aluminum-magnesium layers. The sum of the thicknesses of the plate body 211, the first coating layer 2121 and the second coating layer 214 is 0.5 mm to 2.5 mm, and the thicknesses of both the first polyurea layer 213 and the second polyurea layer 2123 are 0.3 mm to 3 mm. The inner wall of the mounting hole 2111 is provided with an anti-corrosion paint layer.

[0157] The present application further provides a bottom guard plate. The bottom guard plate includes a plate body 211 and a first polyurea layer 213. An anti-corrosion layer 212 is formed on one side surface of the plate body 211, and the first polyurea layer 213 is disposed on the surface of the plate body 211 facing away from the anti-corrosion layer 212. The structure of this bottom guard plate can refer to the bottom guard plate 21 in the above 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 embodiments.

[0158] According to some embodiments of the present application, the above battery device 100a or the above bottom guard plate 21 can be used on electrical equipment. With such an arrangement, by providing the anti-corrosion layer 212 on the surface of the plate body 211 facing the accommodation space, and at the same time disposing the first polyurea layer 213 on the surface of the plate body 211 facing away from the accommodation space. On the one hand, the first polyurea layer 213 is continuous and dense, and is a highly cross-linked network structure. There are a large number of hydrogen bonds between the polyurea molecular chains of the first polyurea layer 213. The hydrogen bonds enhance the intermolecular force between the polyurea molecules, which can improve the overall mechanical properties of the first polyurea layer 213. The highly cross-linked network structure and hydrogen bonds not only endow the first polyurea layer 213 with extremely high hardness, rigidity and adhesion, making the first polyurea layer 213 able to resist external collisions, scratches and impacts, and not easy to fall off, which can improve the mechanical strength, wear resistance and impact resistance of the bottom guard plate 21, but also enable the first polyurea layer 213 to have the ability to resist acids, alkalis, neutral salt spray and high temperatures, so that the first polyurea layer 213 is not easy to be corroded and not easy to be decomposed at high temperatures, which can improve the corrosion resistance and high temperature resistance of the bottom guard plate 21, thus improving the reliability of the battery device; on the other hand, the anti-corrosion layer 212 is disposed on the surface of the plate body 211 facing the accommodation space, and the anti-corrosion layer 212 can block the contact between liquids and other substances and the plate body 211, thereby further improving the corrosion resistance of the bottom guard plate 21, so the reliability of the battery device can be further improved.

[0159] 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 described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; 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 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 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 falling 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 is at least used to support the battery cells. The bottom guard plate includes: a plate body, on the surface facing the accommodation space, an anti-corrosion layer is provided; a first polyurea layer, provided on the 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 first polyurea layer is 0.3 mm to 3 mm.

3. The battery device according to claim 2, characterized in that, The thickness of the first polyurea layer is 0.5 mm to 1.5 mm.

4. The battery device according to any one of claims 1 to 3, characterized in that The pull-out strength of the first polyurea layer is greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the first polyurea layer is less than or equal to 20 mg, the tensile strength of the first polyurea layer is greater than or equal to 10 MPa, and the tear strength of the first polyurea layer is greater than or equal to 10 N / mm.

5. The battery device according to claim 1, characterized in that, The anti-corrosion layer includes one or more of a first coating layer, a first electrophoretic paint layer, an anti-corrosion paint layer, and a second polyurea layer.

6. The battery device according to claim 5, characterized in that, The plate body includes a steel plate, the anti-corrosion layer includes the first coating layer, the bottom guard plate further includes a second coating layer, the first coating layer is provided on the surface of the steel plate facing the accommodation space, the second coating layer is provided on the surface of the steel plate facing away from the accommodation space, and the first polyurea layer is provided on the surface of the second coating layer facing away from the steel plate.

7. The battery device according to claim 6, 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.

8. The battery device according to claim 6, wherein, The first coating layer includes a galvanized layer, the second coating layer includes a galvanized layer, the anti-corrosion layer further includes the first electrophoretic paint layer, the bottom guard plate further includes a second electrophoretic paint layer, the first electrophoretic paint layer is provided on the surface of the first coating layer facing away from the steel plate, and the second electrophoretic paint layer is provided between the first polyurea layer and the second coating layer.

9. The battery device according to claim 6, characterized in that, The anti-corrosion layer further includes the second polyurea layer, and the second polyurea layer is provided on the surface of the first coating layer facing away from the steel plate.

10. The battery device according to claim 9, characterized in that, The thickness of the second polyurea layer is 0.3 mm to 3 mm.

11. The battery device according to claim 10, wherein The thickness of the second polyurea layer is 0.5 mm to 1.5 mm.

12. The battery device according to claim 9, wherein, The pull-out strength of the second polyurea layer is greater than or equal to 1 MPa, the mass loss of the wear-resistant coating of the second polyurea layer is less than or equal to 20 mg, the tensile strength of the second polyurea layer is greater than or equal to 10 MPa, and the tear strength of the second polyurea layer is greater than or equal to 10 N / mm.

13. The battery device according to any one of claims 6 to 12, characterized in that, The sum of the thicknesses of the plate body, the first coating layer, and the second coating layer is 0.5 mm to 2.5 mm.

14. The battery device according to claim 13, wherein, The sum of the thicknesses of the plate body, the first coating layer, and the second coating layer is 0.7 mm to 1.5 mm.

15. The battery device according to claim 5, wherein The plate body is provided with mounting holes, the first polyurea layer and the second polyurea layer avoid the mounting holes, and the first electrophoretic paint layer and / or the anti-corrosion paint layer is provided on the inner wall of the mounting holes.

16. The battery device according to claim 1, wherein The bottom guard plate further includes a carbon fiber layer, and the carbon fiber layer is provided on the surface of the anti-corrosion layer facing the accommodation space.

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

18. A bottom guard plate, characterized in that, The bottom guard plate includes: a plate body, on one side surface of which an anti-corrosion layer is provided; a first polyurea layer, disposed on the surface of the plate body facing away from the anti-corrosion layer.

19. The bottom guard plate according to claim 18, wherein The anti-corrosion layer includes one or more of a first coating layer, a first electrophoretic paint layer, an anti-corrosion paint layer, and a second polyurea layer.

20. An electrical device, characterized in that, The electrical equipment includes: the battery device according to any one of claims 1 to 17; or, the bottom guard plate according to claim 18 or 19.

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