Battery device, bottom protective plate, and electric apparatus

Abstract

A battery device (100a), a bottom protective plate (21), and an electric apparatus. The battery device (100a) comprises a battery cell (10) and a battery case (20) in which an accommodating space is formed. The accommodating space is used for accommodating the battery cell (10). The battery case (20) at least comprises the bottom protective plate (21). The bottom protective plate (21) is at least used for supporting the battery cell (10). The bottom protective plate (21) comprises a plate body (211) and a first polyurea layer (213). The surface of the plate body (211) facing towards the accommodating space is provided with an anti-corrosion layer (212). The first polyurea layer (213) is disposed on the surface of the plate body (211) facing away from the accommodating space. The described structure can improve the reliability of the battery device (100a).

Description

Battery assembly, bottom protection plate and electrical equipment Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device, a bottom protective plate, and an electrical device. Background Technology

[0002] The battery packs of new energy vehicles are usually mounted on the chassis. Some new energy vehicles have low chassis. Due to the uncertainty of road conditions when the vehicle is driving, there is a risk that the chassis may collide with the ground, scratch or hit objects such as gravel, which may damage the battery packs. In order to improve the protection of the battery packs, underbody protection plates have emerged.

[0003] In related technologies, polyvinyl chloride (PVC) coating is usually used as the scratch-resistant and corrosion-resistant layer of the bottom protection plate. However, the scratch resistance of PVC is very limited. When it encounters bumps, scratches or impacts with objects such as gravel, it is easy to fall off, which leads to problems such as easy corrosion of the bottom protection plate and affects the reliability of the battery device.

[0004] Summary of the Invention

[0005] In view of the above problems, this application provides a battery device, a bottom protection plate, and an electrical device to improve the corrosion resistance, high temperature resistance, wear resistance, and impact resistance of the bottom protection plate, thereby improving the reliability of the battery device.

[0006] In a first aspect, this application provides a battery device, which includes a battery cell and a battery housing with a receiving space. The receiving space is used to receive the battery cell. The battery housing includes at least a bottom protective plate, which is used to support the battery cell. The bottom protective plate includes: a plate body with an anti-corrosion layer disposed on the surface facing the receiving space; and 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, the first polyurea layer is continuous and dense, forming a highly cross-linked network structure. Furthermore, there are numerous hydrogen bonds between the polyurea molecular chains in the first polyurea layer. These hydrogen bonds enhance the interaction forces between 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, but also enable the first polyurea layer to resist external impacts, scratches, and collisions, and prevent it from easily detaching. This process improves the mechanical strength, wear resistance, and impact resistance of the bottom protective plate. Furthermore, it gives the first polyurea layer resistance to acids, alkalis, neutral salt spray, and high temperatures, making it less susceptible to corrosion and decomposition at high temperatures. This enhances the corrosion resistance and high-temperature resistance of the bottom protective plate, thereby improving the reliability of the battery device. On the other hand, the anti-corrosion layer, located on the surface of the plate body facing the containment space, prevents liquids and other substances from contacting the plate body, further improving the corrosion resistance of the bottom protective plate and thus further enhancing the reliability of the battery device.

[0007] In some embodiments, the thickness of the first polyurea layer is 0.3 mm to 3 mm. By keeping 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 allows it to exert its excellent properties such as corrosion resistance, high temperature resistance, wear resistance, and impact resistance, so that the first polyurea layer can provide better protection for the board body; on the other hand, it can save the amount of the first polyurea layer used and reduce costs.

[0008] In some embodiments, the thickness of the first polyurea layer is 0.5 mm to 1.5 mm. By keeping 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 provide better protection for the board body, but it can also significantly improve the corrosion resistance, high temperature resistance, wear resistance, and impact resistance of the bottom protection plate, while maintaining economic rationality and keeping the cost of the bottom protection plate within a reasonable range.

[0009] 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 abrasion-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 ensuring that the pull-out strength of the first polyurea layer is greater than or equal to 1 MPa, the mass loss of the abrasion-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, the first polyurea layer can exert its excellent corrosion resistance, high temperature resistance, abrasion resistance, and impact resistance properties, thereby enabling the first polyurea layer to provide better protection for the board body.

[0010] 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 receiving space, it is possible to prevent substances such as liquids from contacting the plate body, thereby further improving the corrosion resistance of the bottom protective plate and thus further improving the reliability of the battery device.

[0011] In some embodiments, the plate body includes a steel plate, the anti-corrosion layer includes a first coating layer, and the bottom protective plate further includes a second coating layer. The first coating layer is disposed on the surface of the steel plate facing the receiving space, the second coating layer is disposed on the surface of the steel plate facing away from the receiving space, and a first polyurea layer is disposed on the surface of the second coating layer facing away from the steel plate. By disposing of the first coating layer on the surface of the steel plate facing the receiving space, the second coating layer on the surface of the steel plate facing away from the receiving 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 and second coating layers wrap around the outer surface of the steel plate, which can prevent liquids and other substances from contacting the steel plate and reduce the risk of corrosion of the steel plate; 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 receiving space, thereby improving the structural strength and impact resistance of the surface of the steel plate facing away from the receiving space, reducing the risk of deformation or cracking of the bottom protective plate when subjected to external impact, and thus improving the reliability of the battery device.

[0012] In some embodiments, the first coating layer includes a zinc plating layer or a zinc-magnesium-aluminum plating layer, and the second coating layer includes a zinc plating layer or a zinc-magnesium-aluminum plating layer. The zinc plating layer or zinc-magnesium-aluminum plating layer effectively improves the overall corrosion resistance of the bottom protective plate.

[0013] In some embodiments, the first coating layer includes a zinc plating layer, the second coating layer includes a zinc plating layer, the anti-corrosion layer further includes a first electrophoretic paint layer, and the bottom protective 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 receiving space, which can further improve the corrosion resistance of the bottom protective plate on the side facing the receiving 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, thereby further improving the corrosion resistance, high temperature resistance, mechanical strength, wear resistance and impact resistance of the bottom protective plate.

[0014] In some embodiments, the anti-corrosion layer further includes a second polyurea layer 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 dual protection for the surface of the steel plate facing the receiving space. This not only further improves the mechanical strength of the side of the bottom cover plate facing the receiving space, thereby improving the bottom cover plate's support capacity for the battery cells, but also further improves the bottom cover plate's corrosion resistance and high-temperature resistance.

[0015] In some embodiments, the thickness of the second polyurea layer is 0.3 mm to 3 mm. By keeping 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, allowing it to exert its excellent properties such as corrosion resistance, high temperature resistance, wear resistance, and impact resistance, so that the second polyurea layer can provide better protection for the plate body, thereby improving the support effect of the bottom protective plate on the battery cells. On the other hand, it can save the amount of the second polyurea layer used and reduce costs.

[0016] In some embodiments, the thickness of the second polyurea layer is 0.5 mm to 1.5 mm. By keeping 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 better protection for the board body, but it can also significantly improve the corrosion resistance, high temperature resistance, wear resistance, and impact resistance of the bottom protection plate, while maintaining economic rationality and keeping the cost of the bottom protection plate within a reasonable range.

[0017] In some embodiments, the pull-out strength of the second polyurea layer is greater than or equal to 1 MPa, the abrasion-resistant coating mass loss 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 ensuring that the pull-out strength of the second polyurea layer is greater than or equal to 1 MPa, the abrasion-resistant coating mass loss 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, the second polyurea layer can exhibit its excellent corrosion resistance, high temperature resistance, abrasion resistance, and impact resistance, thereby enabling the second polyurea layer to provide better protection for the board body.

[0018] 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 protection plate has sufficient strength, hardness, and toughness, making it less prone to deformation or breakage, thereby improving the support and protection effect of the bottom protection plate on the battery cells; on the other hand, it makes the bottom protection plate lighter in weight, which can reduce the impact of the weight of the bottom protection plate on the vehicle's energy consumption, range, etc. when the bottom protection plate is used in the vehicle's battery device.

[0019] 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, the underbody protection plate not only has sufficient strength, hardness, and toughness, making it less prone to deformation or breakage, but also has a lighter weight, resulting in less impact on the vehicle's range and energy consumption. Furthermore, it can reduce the risk of the vehicle's chassis scraping or colliding with the road surface or other obstacles.

[0020] In some embodiments, the plate body has mounting holes, the first polyurea layer and the second polyurea layer avoid the mounting holes, and the first electrophoretic paint layer and / or anti-corrosion paint layer are disposed on the inner wall of the mounting holes. By disposing the first electrophoretic paint layer and / or anti-corrosion paint layer on the inner wall of the mounting holes, while ensuring that the first and second polyurea layers avoid the mounting holes, on the one hand, the placement of the first and second polyurea layers does not affect the inner diameter of the mounting holes, thereby allowing the inner diameter of the mounting holes to match the outer diameter of the fixing components; on the other hand, it can mitigate corrosion of the inner wall of the mounting holes.

[0021] In some embodiments, the bottom cover plate further includes a carbon fiber layer disposed on the surface of the anti-corrosion layer facing the receiving space. By disposing of the carbon fiber layer on the surface of the anti-corrosion layer facing the receiving space, on the one hand, the carbon fiber layer can absorb and disperse the energy generated when the bottom cover plate is subjected to impact or compression, thereby alleviating stress concentration and enabling the bottom cover plate to better resist deformation when subjected to compression or impact, thus improving the toughness of the bottom cover plate. On the other hand, the fibers in the carbon fiber layer are composed of carbon atoms, with a stable chemical structure, giving the carbon fiber layer good corrosion resistance and high temperature resistance, which can improve the overall corrosion resistance and high temperature resistance of the bottom cover plate, thus further improving the reliability of the battery device.

[0022] In some embodiments, the battery housing further includes a frame connected to the outer periphery of the bottom protective plate to form a receiving space with the bottom protective plate. By connecting the frame to the outer periphery of the bottom protective plate to form a receiving space, the bottom protective plate can serve as the bottom wall of the battery housing, thereby improving the corrosion resistance, high temperature resistance, wear resistance, and impact resistance of the bottom wall of the battery housing, thus improving the reliability of the battery device.

[0023] Secondly, this application provides a bottom protection plate, which includes: a plate body, one side surface of which is provided with an anti-corrosion layer; and a first polyurea layer disposed on the surface of the plate body opposite to the anti-corrosion layer. By setting an anti-corrosion layer on one side of the plate body and simultaneously setting a first polyurea layer on the surface of the plate body opposite to the anti-corrosion layer, the first polyurea layer is continuous and dense, forming a highly cross-linked network structure. Furthermore, there are numerous hydrogen bonds between the polyurea molecular chains in the first polyurea layer. These hydrogen bonds enhance the interaction forces between 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 it to resist external impacts, scratches, and collisions, and preventing it from easily detaching, but also improve the mechanical strength, wear resistance, and impact resistance of the bottom plate. Moreover, the first polyurea layer possesses resistance to acids, alkalis, neutral salt spray, and high temperatures, making it less susceptible to corrosion and less prone to decomposition at high temperatures. This improves the corrosion resistance and high-temperature resistance of the bottom plate, thereby enhancing the reliability of the battery device. On the other hand, the anti-corrosion layer prevents liquids and other substances from contacting the plate body, further improving the corrosion resistance of the bottom plate and thus further enhancing the reliability of the battery device.

[0024] 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 receiving space, it is possible to prevent substances such as liquids from contacting the plate body, thereby further improving the corrosion resistance of the bottom protective plate and thus further improving the reliability of the battery device.

[0025] Thirdly, this application provides an electrical device, which includes: the aforementioned battery device, or the aforementioned bottom protective plate.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 is a structural schematic diagram of an embodiment of the electrical equipment provided in this application;

[0029] Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application;

[0030] Figure 3 is an exploded structural diagram of an embodiment of the battery device provided in this application;

[0031] Figure 4 is an exploded structural diagram of the first embodiment of the bottom protective plate of the battery device provided in this application;

[0032] Figure 5 is an exploded structural diagram of the second embodiment of the bottom protective plate of the battery device provided in this application;

[0033] Figure 6 is an exploded structural diagram of the third embodiment of the bottom protective plate of the battery device provided in this application;

[0034] Figure 7 is an exploded structural diagram of the fourth embodiment of the bottom protective plate of the battery device provided in this application;

[0035] Figure 8 is an exploded structural diagram of the fifth embodiment of the bottom protective plate of the battery device provided in this application;

[0036] Figure 9 is an exploded structural diagram of the sixth embodiment of the bottom protective plate of the battery device provided in this application.

[0037] The reference numerals in the detailed embodiments are as follows: vehicle 1000a, battery device 100a, controller 200a, motor 300a, battery cell 10, housing 11, end cap 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. Detailed Implementation

[0038] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments in this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, "detector and / or B" can represent: the detector alone, the detector and B simultaneously, or B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0044] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] With the development of battery technology, battery devices are being applied in more and more fields, gradually replacing traditional fossil fuels in areas such as automotive power. A battery device refers to a physical module comprising one or more battery cells to provide higher voltage and capacity. A battery device includes a battery casing for encapsulating one or more battery cells. The battery casing includes a bottom guard plate, which provides physical protection for the battery device, especially during vehicle operation, reducing or eliminating damage caused by collisions, scrapes, or impacts with objects such as gravel.

[0047] In related technologies, polyvinyl chloride (PVC) coating is usually used as the anti-scratch and anti-corrosion layer of the bottom protection plate. However, PVC has very limited anti-scratch ability and is easy to fall off when it encounters bumps, scratches or impacts with objects such as gravel, which leads to problems such as easy corrosion of the bottom protection plate and affects the reliability of the battery device.

[0048] Based on the above considerations, this application provides a battery device, a bottom protective plate, and an electrical device. The battery device includes a single battery cell and a battery housing with a receiving space for accommodating the battery cell. The battery housing includes at least a bottom protective plate for supporting the battery cell. The bottom protective plate includes a plate body and a first polyurea layer. An anti-corrosion layer is disposed on the surface of the plate body facing the receiving space; the first polyurea layer is 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 of the first polyurea layer on the surface of the plate body facing away from the receiving space, the first polyurea layer is continuous and dense, forming a highly cross-linked network structure. Furthermore, the polyurea molecular chains in the first polyurea layer have a large number of hydrogen bonds. These hydrogen bonds enhance the interaction forces between 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 it to resist external impacts, scratches, and collisions, and preventing it from easily falling off, but also improve the mechanical strength, wear resistance, and impact resistance of the bottom protective plate. Moreover, the first polyurea layer possesses resistance to acids, alkalis, neutral salt spray, and high temperatures, making it less susceptible to corrosion and less prone to decomposition at high temperatures. This improves the corrosion resistance and high-temperature resistance of the bottom protective plate, thereby enhancing the reliability of the battery device. On the other hand, the anti-corrosion layer is located on the surface of the plate body facing the containment space, preventing liquids and other substances from contacting the plate body, further improving the corrosion resistance of the bottom protective plate, thus further enhancing the reliability of the battery device.

[0049] The battery device, bottom cover plate, and electrical equipment disclosed in this application can be used in electrical equipment that uses the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0050] For ease of explanation, the following embodiments will be described using a vehicle 1000a as an example of an electrical device according to an embodiment of this application.

[0051] Referring to Figure 1, vehicle 1000a can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100a is installed inside vehicle 1000a, and the battery device 100a can be located at the bottom of vehicle 1000a. The battery device 100a can be used to power vehicle 1000a; for example, the battery device 100a can serve as the operating power source for vehicle 1000a. Vehicle 1000a may 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, to meet the power needs of vehicle 1000a during starting, navigation, and driving.

[0052] In some embodiments of this application, the battery device 100a can not only serve as the operating power source for the vehicle 1000a, but also as the driving power source for 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 may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0054] Referring to Figures 2 and 3, the battery device 100a mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via a busbar.

[0055] In this embodiment of the application, the battery cell 10 can be a secondary battery, which refers to the battery cell 10 that can be used again after being discharged by recharging to activate the active material.

[0056] The battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0057] In some embodiments, the battery device 100a includes a battery cell 10 and a battery housing 20 having a receiving space for accommodating the battery cell 10.

[0058] In some embodiments, the battery housing 20 may be part of the chassis structure of the vehicle 1000a. For example, a portion of the battery housing 20 may be at least a part of the chassis of the vehicle 1000a, or a portion of the battery housing 20 may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0059] In some embodiments, at least a portion of the battery housing 20 may be disposed on the chassis structure of the vehicle 1000a.

[0060] In some embodiments, the battery housing 20 includes at least a bottom protective plate 21. The bottom protective plate 21 can serve as the bottom wall of the battery housing 20. The bottom protective plate 21 not only supports the individual battery cells 10, but also reduces the risk of damage to the battery housing 20 due to impacts with the ground, scratches, or collisions with objects such as gravel.

[0061] In some other embodiments, the bottom protective plate 21 can be a component independent of the battery box 20, located near the bottom wall of the battery box 20, and located on the side of the bottom wall facing away from the receiving space, so as to support and protect the entire battery box 20.

[0062] This application embodiment will be described using the bottom protective plate 21 as an example of the bottom wall of the battery box 20.

[0063] The battery cell 10 includes an electrode assembly. The electrode assembly is mainly formed by winding or stacking a positive electrode, a negative electrode, and a separator, wherein the separator is disposed between the positive and negative electrode. The portions of the positive and negative electrode containing active material constitute the main body of the electrode assembly, the portion of the positive electrode without active material constitutes the positive electrode tab, and the portion of the negative electrode without active material constitutes the negative electrode tab. During the charging and discharging process of the battery device 100a, the positive and negative active materials react with the electrolyte to form a current circuit.

[0064] The battery cell 10 also includes a housing 11 and an end cap 12. The housing 11 is a component for housing the electrode assembly. The housing 11 can be a hollow structure with an opening at one end, or a hollow structure with openings at both opposite ends. The housing 11 can have various shapes, such as cylindrical or cuboid. The housing 11 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. 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 together define a receiving space for housing the electrode assembly, electrolyte, and other components. The end cap 12 can be connected to the housing 11 by welding or roll sealing 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, if the housing 11 is a cuboid structure, the end cap 12 can be a rectangular plate structure adapted to the housing 11. Alternatively, if the housing 11 is a cylindrical structure, the end cap 12 can be a circular plate structure adapted to the housing 11. The end cap 12 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, or plastic. The end cap 12 and the housing 11 can be made of the same or different materials.

[0065] In some embodiments, referring to Figures 3 and 4, the battery device includes a battery cell 10 and a battery housing 20 having a receiving space for accommodating the battery cell 10. The battery housing 20 includes at least a bottom protective plate 21, which at least supports the battery cell 10. The bottom protective plate 21 includes a plate body 211 and a first polyurea layer 213. An anti-corrosion layer 212 is disposed on the surface of the plate body 211 facing the receiving space; the first polyurea layer 213 is disposed on the surface of the plate body 211 facing away from the receiving space.

[0066] In some embodiments, by providing an anti-corrosion layer 212 on the surface of the plate body 211 facing the accommodating space, it is possible to prevent substances such as liquids generated inside the battery box 20 from contacting the plate body 211, thereby reducing the risk of the plate body 211 being corroded by substances such as liquids generated inside the battery box 20.

[0067] The first polyurea layer 213 can be applied to the surface of the board body 211 facing away from the receiving space by means of scraping or spraying.

[0068] The first polyurea layer 213 is made of an elastomeric material formed by the reaction of isocyanate components and amino compound components. In some embodiments, the first polyurea layer 213 contains at least one of a flame retardant, a colorant, and an antioxidant. The flame retardant can improve the flame retardant performance of the bottom cover 21, reducing the risk of fire caused by overheating of the battery box 20 or scratching or impact with other objects. Adding a colorant to the first polyurea layer 213 can improve the aesthetics of the bottom cover 21. Adding an antioxidant to the first polyurea layer 213 can inhibit or delay the degradation of the first polyurea layer 213, improving its durability and stability, thereby extending the service life of the bottom cover 21.

[0069] By setting an anti-corrosion layer 212 on the surface of the plate body 211 facing the receiving space, and simultaneously setting a first polyurea layer 213 on the surface of the plate body 211 facing away from the receiving space, the first polyurea layer 213 is continuous and dense, forming a highly cross-linked network structure. Furthermore, there are numerous hydrogen bonds between the polyurea molecular chains of the first polyurea layer 213. These hydrogen bonds enhance the interaction forces between polyurea molecules, improving 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, but also enable it to resist external impacts, scratches, and collisions, and are not easily damaged. The first polyurea layer 213 is designed to prevent detachment, thereby improving the mechanical strength, wear resistance, and impact resistance of the bottom protective plate 21. It also provides the first polyurea layer 213 with resistance to acids, alkalis, neutral salt spray, and high temperatures, making it less susceptible to corrosion and decomposition at high temperatures. This enhances the corrosion resistance and high-temperature resistance of the bottom protective plate 21, thus improving the reliability of the battery device. Furthermore, the anti-corrosion layer 212, located on the surface of the plate body 211 facing the accommodating space, prevents liquids and other substances from contacting the plate body 211, further improving the corrosion resistance of the bottom protective plate 21 and thus further enhancing 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 0.3mm, 0.32mm, 0.38mm, 0.4mm, 0.52mm, 0.55mm, 0.58mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.35mm, 1.4mm, 1.53mm, 1.55mm, 1.6mm, 1.66mm, 1.7mm, 1.8mm, 1.95mm, 2mm, 2.2mm, 2.35mm, 2.4mm, 2 The 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 0.3mm to 3mm. The thicknesses are 0.45mm, 2.5mm, 2.52mm, 2.55mm, 2.585mm, 2.6mm, 2.635mm, 2.66mm, 2.7mm, 2.75mm, 2.78mm, 2.8mm, 2.845mm, 2.88mm, 2.9mm, 2.935mm, 2.966mm, 3mm, etc., but are not limited to these.

[0072] By making the thickness of the first polyurea layer 213 within the range of 0.3mm to 3mm, on the one hand, the thickness of the first polyurea layer 213 is moderate, which can give full play to its excellent properties such as corrosion resistance, high temperature resistance, wear resistance and impact resistance, so that the first polyurea layer 213 can provide better protection for the board body 211. On the other hand, it can save the amount of the first polyurea layer 213 used and reduce costs.

[0073] In addition, if the thickness of the first polyurea layer 213 is less than 0.3mm, the thickness of the first polyurea layer 213 will be insufficient, making it difficult to resist external collisions, scratches and impacts. As a result, the protective effect of the first polyurea layer 213 on the board body 211 will be poor, and the production process of the first polyurea layer 213 will be difficult, making it difficult to guarantee the consistency and precision of the thickness of the first polyurea layer 213. If the thickness of the first polyurea layer 213 is greater than 3mm, the cost of the first polyurea layer 213 will be too high.

[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 0.5mm, 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, or 1.15mm. The thickness of the first polyurea layer 213 can be 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 is not limited to these. 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 0.5mm to 1.5mm.

[0076] By making the thickness of the first polyurea layer 213 within the range of 0.5mm to 1.5mm, not only can the first polyurea layer 213 provide better protection for the plate body 211, but it can also significantly improve the corrosion resistance, high temperature resistance, wear resistance and impact resistance of the bottom protective plate 21, while maintaining economic rationality, so that the cost of the bottom protective plate 21 can 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 abrasion-resistant coating mass loss 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] The pull-out strength test can refer to the national standard GB / T 5210, the abrasion resistance coating mass loss test 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 is not limited to these. 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 abrasion-resistant coating of the first polyurea layer 213 can be 20mg, 18mg, 17mg, 16.5mg, 16mg, 15.55mg, 15mg, 14.7mg, 14.2mg, 13.8mg, 13mg, 12g, 11mg, 10mg, 8mg, etc., but is not limited to these. The specific value of the mass loss of the abrasion-resistant coating of the first polyurea layer 213 can be selected according to the actual situation, as long as the mass loss of the abrasion-resistant coating of the first polyurea layer 213 is less than or equal to 20mg.

[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 is not limited to these. 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 is not limited to these. 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 ensuring that the pull-out strength of the first polyurea layer 213 is greater than or equal to 1 MPa, the abrasion-resistant coating mass loss 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, the first polyurea layer 213 can exert its excellent corrosion resistance, high temperature resistance, abrasion resistance, and impact resistance properties, so that the first polyurea layer 213 can provide better protection for the plate body 211.

[0084] In some embodiments, the anti-corrosion layer 212 includes one or more of the following: 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 receiving space by means of hot-dip galvanizing, electroplating, diffusion 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 applied to the surface of the plate body 211 facing the receiving space by 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 coatings, rubber resin anti-corrosion coatings, modified resin anti-corrosion coatings, polyurethane anti-corrosion coatings, acrylic anti-corrosion coatings, or inorganic zinc-rich anti-corrosion coatings. The anti-corrosion paint layer can be applied to the surface of the plate body 211 facing the receiving space by spraying, roller coating, dipping, 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 material 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, which can resist collisions, scratches, and impacts from components such as the battery cells 10 inside the battery device, and is not easily detached. It can improve the mechanical strength, wear resistance, and impact resistance of the bottom protective plate 21. At the same time, the second polyurea layer 2123 has the ability to resist acids, alkalis, neutral salt spray, and high temperatures. It is not easily corroded and is not easily decomposed at high temperatures, which can improve the corrosion resistance and high temperature resistance of the bottom protective 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 differ from the color of the colorant in the first polyurea layer 213, allowing users to easily distinguish the surface of the bottom cover 21 facing the receiving space from the surface facing away from the receiving space, thereby improving 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 can 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 applying 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 to the surface of the plate body 211 facing the receiving space, it is possible to prevent liquids and other substances from contacting the plate body 211, thereby further improving the corrosion resistance of the bottom protective plate 21 and thus further improving the reliability of the battery device 100a.

[0092] In some embodiments, please refer to Figure 5 as well. The plate body 211 includes a steel plate 2112, the anti-corrosion layer 212 includes a first coating layer 2121, and the bottom protective plate 21 also includes a second coating layer 214. The first coating layer 2121 is disposed on the surface of the steel plate 2112 facing the receiving space, the second coating layer 214 is disposed on the surface of the steel plate 2112 facing away from the receiving 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 easily deformed or broken. The steel plate 2112 is the main body of the plate body 211. By using the steel plate 2112 as the main body of the plate body 211, when the chassis of the vehicle 1000a collidees with the ground, scrapes, or impacts with objects such as gravel, the underbody protection plate 21 can effectively resist external impacts without deforming or breaking, and will not compress the battery cells 10, thus protecting the safety of the battery cells 10. Therefore, it can improve the reliability of the battery box 20 and the battery pack 100a.

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

[0095] The second coating layer 214 can be formed on the surface of the steel plate 2112 facing away from the accommodating space by means of hot-dip galvanizing, electroplating, or diffusion coating.

[0096] The surface of the steel plate 2112 facing away from the receiving space is the outer surface of the steel plate 2112 and is also the surface most susceptible to external impact. By providing a second coating layer 214 and a first polyurea layer 213 on the surface of the steel plate 2112 facing away from the receiving 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 receiving space, thereby improving the structural strength and impact resistance of the surface of the steel plate 2112 facing away from the receiving space. This can reduce the risk of deformation or cracking of the bottom protective plate 21 when subjected to external impact, thus improving the reliability of the battery device 100a.

[0097] By providing a first coating layer 2121 on the surface of the steel plate 2112 facing the receiving space, a second coating layer 214 on the surface of the steel plate 2112 facing away from the receiving space, and a first polyurea layer 213 on the surface of the second coating layer 214 facing away from the steel plate 2112, the first coating layer 2121 and the second coating layer 214 wrap around the outer surface of the steel plate 2112, which can prevent liquids and other substances from contacting 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 receiving space, thereby improving the structural strength and impact resistance of the surface of the steel plate 2112 facing away from the receiving space, reducing the risk of deformation or cracking of the bottom protective plate 21 when subjected to external impact, and thus improving the reliability of the battery device 100a.

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

[0099] In some embodiments, the first coating layer 2121 and / or the second coating layer 214 may be a zinc plating layer. The zinc plating layer disposed on the surface of the steel plate 2112 can prevent liquids and other substances from contacting the steel plate 2112. When the first coating layer 2121 and / or the second coating layer 214 are damaged, the zinc plating layer and the steel plate 2112 will form a galvanic cell in a humid environment. In this cell, the zinc plating layer, as the anode, is preferentially corroded, while the steel plate 2112, as the cathode, is protected. This helps to mitigate the corrosion of the steel plate 2112. At the same time, the products generated after the zinc plating layer is oxidized by oxygen are usually very dense and can cover the damaged area, thereby reducing the rate of corrosion of the zinc plating layer and improving the overall corrosion resistance of the bottom protective plate 21.

[0100] In some embodiments, the first coating layer 2121 and / or the second coating layer 214 can be zinc-magnesium-aluminum coatings. The zinc-magnesium-aluminum coating can be a zinc-magnesium-aluminum alloy layer. The zinc-magnesium-aluminum coating, applied to the surface of the steel plate 2112, serves to prevent liquids and other substances from contacting the steel plate 2112. When the first coating layer 2121 and / or the second coating layer 214 are damaged, zinc and the steel plate 2112 will form a galvanic cell in a humid environment. Zinc, acting as the anode, is preferentially corroded, while the steel plate 2112, acting as the cathode, is protected. This sacrificial anode protection effectively slows down the corrosion rate of the steel plate 2112, improving the overall corrosion resistance of the bottom protective plate 21. Simultaneously, magnesium and aluminum can react with air to form a dense oxide film, which covers the damaged area, preventing further corrosion of zinc and the steel plate 2112, thereby further enhancing the corrosion resistance of the steel plate 2112 and further improving the corrosion resistance of the bottom protective plate 21.

[0101] The application of a galvanized or zinc-magnesium-aluminum galvanized layer can effectively improve the overall corrosion resistance of the bottom protective plate 21.

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

[0103] The first coating layer 2121 includes a zinc coating layer, and the second coating layer 214 includes a zinc coating layer. The zinc coating layer is wrapped 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 corresponding zinc coating layers on the surface facing away from the steel plate 2112. That is, the zinc coating layer and the first electrophoretic paint layer 2122 are disposed sequentially on the surface of the steel plate 2112 facing the receiving space, and the zinc coating layer and the second electrophoretic paint layer 215 are disposed sequentially on the surface of the steel plate 2112 facing away from the receiving space. This can meet the test requirements of no red rust in salt spray test for more than 720 hours.

[0104] In some embodiments, a zinc-magnesium-aluminum plating layer can be used instead of a zinc plating layer, and the first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 can be omitted. That is, the first coating layer 2121 includes a zinc-magnesium-aluminum plating layer, the second coating layer 214 includes a zinc-magnesium-aluminum plating layer, and the zinc-magnesium-aluminum plating layer is wrapped 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] The first electrophoretic paint layer 2122 is formed on the surface of the first coating layer 2121 facing away from the steel plate 2112 by 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 by an electrophoretic process.

[0106] In some embodiments, before forming the first electrophoretic paint layer 2122 on the surface of the first coating layer 2121 facing away from the steel plate 2112 by electrophoresis, and before forming the second electrophoretic paint layer 215 on the surface of the second coating layer 214 facing away from the steel plate 2112 by electrophoresis, dirt on the surfaces of the first coating layer 2121 and the second coating layer 214 can be removed by degreasing, pickling, spraying and other treatment methods, 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, so that the first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 are 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 materials, 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 materials, polyethylene, or polypropylene. The materials of the first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 can be the same, or they can be different. Both the first electrophoretic paint layer 2122 and the second electrophoretic paint layer 215 have advantages such as high density and high hardness, which can further improve the wear resistance and corrosion resistance of the bottom protective plate 21.

[0108] By placing the first electrophoretic paint layer 2122 on the surface of the first coating layer 2121 facing away from the steel plate 2112, and placing 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 receiving space, which can further improve the corrosion resistance of the side of the bottom protective plate 21 facing the receiving 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, thereby further improving the corrosion resistance, high temperature resistance, mechanical strength, wear resistance and impact resistance of the bottom protective plate 21.

[0109] In some embodiments, referring to FIG7, the anti-corrosion layer 212 further includes a second polyurea layer 2123, which 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 dual protection for the surface of the steel plate 2112 facing the receiving space. This not only further improves the mechanical strength of the side of the bottom protective plate 21 facing the receiving space, thereby improving the support capacity of the bottom protective plate 21 for the battery cell 10, but also further improves the corrosion resistance and high temperature resistance of the bottom protective plate 21.

[0111] In some embodiments, referring to FIG8, the second polyurea layer 2123 may 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, thereby further improving the corrosion resistance, high temperature resistance, mechanical strength, wear resistance and impact resistance of the bottom protective 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 0.3mm, 0.32mm, 0.38mm, 0.4mm, 0.52mm, 0.55mm, 0.58mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.35mm, 1.4mm, 1.53mm, 1.55mm, 1.6mm, 1.66mm, 1.7mm, 1.8mm, 1.95mm, 2mm, 2.2mm, 2.35mm, 2.4mm, 2 The 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 0.3mm to 3mm. The thicknesses are 0.45mm, 2.5mm, 2.52mm, 2.55mm, 2.585mm, 2.6mm, 2.635mm, 2.66mm, 2.7mm, 2.75mm, 2.78mm, 2.8mm, 2.845mm, 2.88mm, 2.9mm, 2.935mm, 2.966mm, 3mm, etc., but are not limited to these.

[0114] By making the thickness of the second polyurea layer 2123 within the range of 0.3mm to 3mm, on the one hand, the thickness of the second polyurea layer 2123 is moderate, which can give full play to its excellent properties such as corrosion resistance, high temperature resistance, wear resistance and impact resistance, so that the second polyurea layer 2123 can provide better protection for the plate body 211, thereby improving the support effect of the bottom protective plate 21 on the battery cell 10. On the other hand, it can save the amount of the second polyurea layer 2123 used and reduce costs.

[0115] In addition, if the thickness of the second polyurea layer 2123 is less than 0.3 mm, the thickness of the second polyurea layer 2123 will be insufficient, making it difficult to resist the impact inside the battery device 100a. This will result in poor protection of the plate body 211 by the second polyurea layer 2123, and the production process of the second polyurea layer 2123 will be difficult, and the consistency and precision of the thickness will be difficult to guarantee. If the thickness of the second polyurea layer 2123 is greater than 3 mm, the cost of the second polyurea layer 2123 will be too high.

[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, etc. The 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 0.88mm, 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 is not limited to these.

[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 better protection for the plate body 211, but it can also significantly improve the corrosion resistance, high temperature resistance, wear resistance and impact resistance of the bottom protective plate 21, while maintaining economic rationality, so that the cost of the bottom protective 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 1 MPa, the abrasion-resistant coating mass loss of the second polyurea layer 2123 is less than or equal to 20 mg, the tensile strength of the second polyurea layer 2123 is greater than or equal to 10 MPa, and the tear strength of the second polyurea layer 2123 is greater than or equal to 10 N / mm.

[0120] The pull-out strength test can refer to the national standard GB / T 5210, the abrasion resistance coating mass loss test 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 is not limited to these. 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 abrasion-resistant coating of the second polyurea layer 2123 can be 20mg, 18mg, 17mg, 16.5mg, 16mg, 15.55mg, 15mg, 14.7mg, 14.2mg, 13.8mg, 13mg, 12g, 11mg, 10mg, 8mg, etc., but is not limited to these. The specific value of the mass loss of the abrasion-resistant coating of the second polyurea layer 2123 can be selected according to the actual situation, as long as the mass loss of the abrasion-resistant coating of the second polyurea layer 2123 is less than or equal to 20mg.

[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 is not limited to these. 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 is not limited to these. 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 ensuring that the pull-out strength of the second polyurea layer 2123 is greater than or equal to 1 MPa, the abrasion-resistant coating mass loss of the second polyurea layer 2123 is less than or equal to 20 mg, the tensile strength of the second polyurea layer 2123 is greater than or equal to 10 MPa, and the tear strength of the second polyurea layer 2123 is greater than or equal to 10 N / mm, the second polyurea layer 2123 can exert its excellent corrosion resistance, high temperature resistance, abrasion resistance, and impact resistance properties, so that the second polyurea layer 2123 can provide better protection for 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 0.5mm, 0.52mm, 0.55mm, 0.58mm, 0.6mm, 0.635mm, 0.66mm, 0.68mm, 0.72mm, 0.75mm, 0.77mm, 0.785mm, 0.8mm, 0.85mm, 0.88mm, 0.9mm, 0.96mm, 1mm, 1.2mm, 1.35mm, 1.4mm, 1.47mm, 1.53mm, 1.55mm, 1.6mm, 1.66mm, 1.7mm, 1 The thicknesses can be 0.756mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, 2mm, 2.2mm, 2.35mm, 2.4mm, 2.45mm, 2.5mm, etc., but are not limited to these. 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 0.5mm to 2.5mm.

[0128] By ensuring that 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 0.5mm to 2.5mm, the bottom protection plate 21 possesses sufficient strength, hardness, and toughness, making it less prone to deformation or breakage, thus improving its support and protection effect on the battery cell 10. Furthermore, the bottom protection plate 21 is made lighter, reducing its impact on the energy consumption and range of the vehicle 1000a when used in the battery device 100a of the vehicle 1000a.

[0129] Furthermore, if the sum of the thicknesses of the plate 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 protection plate 21, causing it to be unable to effectively resist external collisions, scratches, and impacts, and making it prone to deformation or breakage, thus increasing the risk of damage to the battery cell 10 and affecting its reliability. If the sum of the thicknesses of the plate body 211, the first coating layer 2121, and the second coating layer 214 is greater than 2.5 mm, the bottom protection plate 21 will be too heavy. When the bottom protection plate 21 is used in the battery device 100a of the vehicle 1000a, its weight may affect the range and energy consumption of the vehicle 1000a. At the same time, it may also reduce the distance between the vehicle 1000a and the ground, thereby increasing the risk of the vehicle 1000a scraping or colliding with the road surface or other obstacles.

[0130] 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 0.7 mm to 1.5 mm.

[0131] The sum of the thicknesses of the plate body 211, the first coating layer 2121, and the second coating layer 214 can be 0.7mm, 0.73mm, 0.755mm, 0.788mm, 0.95mm, 0.82mm, 0.83mm, 0.86mm, 0.875mm, 0.89mm, 0.925mm, 0.94mm, 0.955mm, 0.97mm, 1.05mm, 1.15mm, 1.18mm, 1.22mm, 1.232mm, 1.255mm, and 1. The thicknesses can be 26mm, 1.28mm, 1.3mm, 1.33mm, 1.365mm, 1.38mm, 1.42mm, 1.44mm, 1.47mm, 1.485mm, 1.5mm, etc., but are not limited to these. 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 0.7mm to 1.5mm.

[0132] By ensuring that 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 0.7mm to 1.5mm, the underbody protection plate 21 not only possesses sufficient strength, hardness, and toughness, making it less prone to deformation or breakage, but also reduces its weight, minimizing its impact on the range and energy consumption of the vehicle 1000a. Furthermore, it reduces the risk of the vehicle 1000a's chassis scraping or colliding with 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 anti-corrosion paint layer are disposed on the inner wall of the mounting holes 2111.

[0134] The mounting hole 2111 can be a threaded hole 2111a and / or a mounting hole on the mounting part. The threaded hole 2111a is formed on the plate body 211. The threaded hole 2111a can be used to mate with a fixing component to mount the bottom cover plate 21 onto the frame 22 of the battery box 20. The threaded hole 2111a can penetrate the surface of the steel plate 2112 facing the receiving space and the surface away from the receiving space. The mounting part is fixed or integrally formed on the surface of the plate body 211 facing the receiving space and / or the surface of the plate body 211 away from the receiving space. The mounting hole is formed on the mounting part. The mounting hole can be used to mate with a fixing component to mount the bottom cover plate 21 onto the battery cell 10 housing 11 and / or electrical equipment. The fixing component includes, but is not limited to, screws, bolts, studs, or rivets.

[0135] During the preparation of the bottom protective plate 21, the first coating layer 2121 and the second coating layer 214 are preferentially disposed on the steel plate 2112, and then the mounting hole 2111 is opened. The mounting hole 2111 penetrates the steel plate 2112, the first coating layer 2121 and the second coating layer 214, and then the first electrophoretic paint layer 2122 is disposed. The first electrophoretic paint layer 2122 does not need to avoid the mounting hole 2111, so that the inner wall of the mounting hole 2111 is covered with the first electrophoretic paint layer 2122 to alleviate the problem of corrosion of the inner wall of the mounting hole 2111; or, an anti-corrosion paint layer can be applied on the first electrophoretic paint layer 2122 on the inner wall of the mounting hole 2111 to form double protection for the inner wall of the mounting hole 2111. The first polyurea layer 213 is formed on the surface of the bottom cover plate 21 facing away from the receiving space, and the second polyurea layer 2123 is formed on the surface of the bottom cover plate 21 facing the receiving space. The first polyurea layer 213 and the second polyurea layer 2123 can avoid the mounting hole 2111 by covering it, so that the arrangement of the first polyurea layer 213 and the second polyurea layer 2123 will not affect the inner diameter of the mounting hole 2111, thereby allowing the inner diameter of the mounting hole 2111 to be adapted to the outer diameter of the fixing component.

[0136] In some embodiments, the mounting portion is fixed or integrally formed on the surface of the plate body 211 facing the receiving space, and at least one of the following is provided on the surface of the mounting portion: a first coating layer 2121, a first electrophoretic paint layer 2122, and an anti-corrosion paint layer.

[0137] In some embodiments, the mounting portion is fixed or integrally formed on the surface of the plate body 211 facing away from the receiving space. At least one of a second coating layer 214, a second electrophoretic paint layer 215, and an anti-corrosion paint layer is provided on the surface of the mounting portion.

[0138] By setting the first electrophoretic paint layer 2122 and / or the anti-corrosion paint layer on the inner wall of the mounting hole 2111, while making the first polyurea layer 213 and the second polyurea layer 2123 avoid the mounting hole 2111, 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, thereby enabling the inner diameter of the mounting hole 2111 to match the outer diameter of the fixed component, and on the other hand, it can alleviate the corrosion of the inner wall of the mounting hole 2111.

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

[0140] In some embodiments, referring to FIG9, the bottom protective plate 21 further includes a carbon fiber layer 216 disposed on the surface of the anti-corrosion layer 212 facing the receiving space.

[0141] The carbon fiber layer 216 can be applied to the surface of the anti-corrosion layer 212 facing the receiving space using adhesives such as epoxy resin, polyimide resin, bismaleimide resin or phenolic resin, and then cured under pressure to ensure that the adhesive is evenly distributed and fully cured, thereby enhancing the connection strength between the carbon fiber layer 216 and the anti-corrosion layer 212.

[0142] By placing the carbon fiber layer 216 on the surface of the anti-corrosion layer 212 facing the accommodating space, the carbon fiber layer 216 can absorb and disperse the energy generated when the bottom protective plate 21 is subjected to impact or compression, thereby alleviating stress concentration and enabling the bottom protective plate 21 to better resist deformation when subjected to compression or impact, thus improving the toughness of the bottom protective plate 21. On the other hand, the fibers in the carbon fiber layer 216 are composed of carbon atoms, with a stable chemical structure, giving the carbon fiber layer 216 good corrosion resistance and high temperature resistance, which can improve the overall corrosion resistance and high temperature resistance of the bottom protective plate 21, thus further improving the reliability of the battery device 100a.

[0143] In addition, the carbon fiber layer 216 has good thermal conductivity, which 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 cover plate 21, thereby improving the reliability of the battery device 100a. At the same time, the carbon fiber layer 216 is lightweight, which can reduce the weight of the bottom cover plate 21, thereby improving the energy utilization efficiency and range of the battery device 100a.

[0144] In some embodiments, please continue to refer to Figures 2 to 3, the battery housing 20 also includes a frame 22, which is connected to the outer periphery of the bottom protective plate 21 to form a receiving space with the bottom protective 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 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 protective plate 21 covers the opening at the other end of the first part 221 to form a receiving space. The bottom protective plate 21 serves as the bottom wall of the battery box 20 and is used to support and protect the battery cell 10.

[0146] By connecting the frame 22 to the outer periphery of the bottom cover plate 21 to form a receiving space, the bottom cover plate 21 can serve as the bottom wall of the battery box 20, which can improve the corrosion resistance, high temperature resistance, wear resistance and impact resistance of the bottom wall of the battery box 20, thereby improving the reliability of the battery device.

[0147] In some embodiments, the battery housing 20 further includes a frame 22 and a bottom shell, the frame 22 being connected to the outer periphery of the bottom shell to form an accommodating space with the bottom shell, and a bottom protective plate 21 being disposed on the side of the bottom shell facing away from the accommodating space.

[0148] In some embodiments, referring to Figures 2 and 3, the frame 22 may include a first part 221, a second part 222, and a bottom shell (not shown). The first part 221 is a hollow structure with openings at both ends. 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 shell covers the opening at the other end of the first part 221. The first part 221 and the bottom shell can be fixed together by welding, bolting, bonding, or other methods. In other embodiments, the first part 221 and the bottom shell are integrally formed. The first part 221 and the bottom shell can be integrally formed by forging, stamping, or other methods. The end of the first part 221 away from the bottom shell has an opening. 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 of the first part 221.

[0149] In some embodiments, the mounting holes 2111 on the bottom cover 21 can be used to cooperate with a fixing component to mount the bottom cover 21 onto the bottom shell of the battery box 20.

[0150] By placing the bottom protective plate 21 on the side of the bottom shell facing away from the accommodating space, the structural strength, impact resistance and toughness of the bottom shell of the battery box 20 can be improved, the risk of deformation of the bottom shell of the battery box 20 when subjected to impact or compression can be reduced, thereby improving the reliability of the battery device 100a.

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

[0152] In some embodiments, as shown in FIG5, a first coating layer 2121 is provided on the surface of the plate body 211 facing the receiving space, a second coating layer 214 is provided on the surface of the plate body 211 facing away from the receiving 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. Both the first coating layer 2121 and the second coating layer 214 are zinc-plated 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. An anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111.

[0153] In some embodiments, as shown in FIG5, a first coating layer 2121 is provided on the surface of the plate body 211 facing the receiving space, a second coating layer 214 is provided on the surface of the plate body 211 facing away from the receiving 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. Both the first coating layer 2121 and the second coating layer 214 are zinc-aluminum-magnesium coated 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. An anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111.

[0154] In some embodiments, as shown in FIG6, a first coating layer 2121 is provided on the surface of the plate body 211 facing the receiving 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 receiving 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, and a first polyurea layer 213 is provided on the surface of the second electrophoretic paint layer 215 facing away from the plate body 211. The first coating layer 2121 and the second coating layer 214 are both zinc-plated 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 a first electrophoretic paint layer 2122 or a second electrophoretic paint layer 215; or, the inner wall of the mounting hole 2111 is provided with a first electrophoretic paint layer 2122 and an anti-corrosion paint layer; or, the inner wall of the mounting hole 2111 is provided with a second electrophoretic paint layer 215 and an anti-corrosion paint layer.

[0155] In some embodiments, as shown in FIG7, a first coating layer 2121 is provided on the surface of the plate body 211 facing the receiving 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 receiving space, and a first polyurea layer 213 is formed on the surface of the second coating layer 214 facing away from the plate body 211. Both the first coating layer 2121 and the second coating layer 214 are zinc-plated 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. An anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111.

[0156] In some embodiments, as shown in FIG7, a first coating layer 2121 is provided on the surface of the plate body 211 facing the receiving 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 receiving space, and a first polyurea layer 213 is formed on the surface of the second coating layer 214 facing away from the plate body 211. Both the first coating layer 2121 and the second coating layer 214 are zinc-aluminum-magnesium coated 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 and second polyurea layers 213 are 0.3 mm to 3 mm. An anti-corrosion paint layer is provided on the inner wall of the mounting hole 2111.

[0157] This application further proposes a bottom protector. The bottom protector includes a plate body 211 and a first polyurea layer 213. An anti-corrosion layer 212 is formed on one 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 protector can be referred to as the bottom protector 21 in the above embodiments. This bottom protector 21 can be used in battery device 100a and electrical equipment. Since the bottom protector 21 is used in battery device 100a and electrical equipment, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0158] According to some embodiments of this application, the battery device 100a or the bottom protective plate 21 described above can be used in electrical equipment. With this configuration, by providing an anti-corrosion layer 212 on the surface of the plate body 211 facing the receiving space, and simultaneously providing a first polyurea layer 213 on the surface of the plate body 211 facing away from the receiving space, the first polyurea layer 213 is continuous and dense, forming a highly cross-linked network structure. Furthermore, there are numerous hydrogen bonds between the polyurea molecular chains of the first polyurea layer 213. These hydrogen bonds enhance the interaction forces between polyurea molecules, improving 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 it to resist external impacts, scratches, and collisions, but also making it less prone to corrosion. The shedding of the first polyurea layer 213 improves the mechanical strength, wear resistance, and impact resistance of the bottom protective plate 21. It also makes the first polyurea layer 213 resistant to acid, alkali, neutral salt spray, and high temperatures, thus making it less susceptible to corrosion and decomposition at high temperatures. This enhances the corrosion resistance and high-temperature resistance of the bottom protective plate 21, thereby improving the reliability of the battery device. Furthermore, the anti-corrosion layer 212 is disposed on the surface of the plate body 211 facing the receiving space. The anti-corrosion layer 212 prevents liquids and other substances from contacting the plate body 211, further improving the corrosion resistance of the bottom protective plate 21 and thus further enhancing the reliability of the battery device.

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

Claims

1. A battery device, wherein, The battery device includes a battery cell and a battery housing with a receiving space for accommodating the battery cell. The battery housing includes at least a bottom protective plate for supporting the battery cell. The bottom protective plate includes: The plate body has an anti-corrosion layer on its surface facing the receiving space; A first polyurea layer is disposed on the surface of the plate body facing away from the receiving space.

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

3. The battery device according to claim 2, wherein, 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, wherein, The first polyurea layer has a pull-out strength greater than or equal to 1 MPa, a wear-resistant coating mass loss of the first polyurea layer less than or equal to 20 mg, a tensile strength of the first polyurea layer greater than or equal to 10 MPa, and a tear strength of the first polyurea layer greater than or equal to 10 N / mm.

5. The battery device according to claim 1, wherein, The anti-corrosion layer includes one or more of the following: 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, wherein, The plate body includes a steel plate, the anti-corrosion layer includes a first coating layer, and the bottom protective plate further includes a second coating layer. The first coating layer is disposed on the surface of the steel plate facing the receiving space, the second coating layer is disposed on the surface of the steel plate facing away from the receiving space, and the first polyurea layer is disposed 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 zinc coating layer or a zinc-magnesium-aluminum coating layer, and the second coating layer includes a zinc coating layer or a zinc-magnesium-aluminum coating layer.

8. The battery device according to claim 6, wherein, The first coating layer includes a zinc plating layer, the second coating layer includes a zinc plating layer, the anti-corrosion layer also includes the first electrophoretic paint layer, and the bottom protective plate also includes the 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.

9. The battery device according to claim 6, wherein, The anti-corrosion layer further includes a second polyurea layer, which is disposed on the surface of the first coating layer facing away from the steel plate.

10. The battery device according to claim 9, wherein, 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 abrasion-resistant coating mass loss 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, wherein, 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 are disposed on the inner wall of the mounting holes.

16. The battery device according to claim 1, wherein, The bottom protective plate also includes a carbon fiber layer disposed on the surface of the anti-corrosion layer facing the receiving space.

17. The battery device according to claim 1, wherein, The battery housing also includes a frame, which is connected to the outer periphery of the bottom protective plate to form the receiving space with the bottom protective plate.

18. A bottom protective plate, wherein, The bottom protective plate includes: The plate body has an anti-corrosion layer on one side surface; The first polyurea layer is disposed on the surface of the plate body facing away from the anti-corrosion layer.

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

20. An electrical appliance, wherein, The electrical equipment includes: The battery device as claimed in any one of claims 1 to 17; or the bottom protective plate as claimed in claim 18 or 19.

Images