Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box body, a battery monomer and a protection plate. The battery monomer is contained in the box body, and the protection plate is connected to the box body. The protection plate comprises a first fiber resin layer and a reinforcing plate. The first fiber resin layer is arranged on at least one side of the reinforcing plate along the thickness direction. The elongation after fracture e1 of the reinforcing plate is greater than or equal to 28%, and the strain hardening index N of the reinforcing plate is greater than or equal to 0.27. The battery device provided by the application is beneficial to reducing the risk of deformation of the protection plate and the risk of fracture of the protection plate.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, reliability is also a crucial consideration. Therefore, improving the reliability of battery devices is a continuous challenge in battery device technology. Utility Model Content

[0004] This application provides a battery device and an electrical device that are beneficial for improving the energy density of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, the battery device provided in the embodiments of this application includes a housing, a battery cell, and a protective plate. The battery cell is housed in the housing, and the protective plate is connected to the housing. The protective plate includes a first fiber resin layer and a reinforcing plate. The first fiber resin layer is disposed on at least one side of the reinforcing plate along the thickness direction. The elongation after fracture of the reinforcing plate is e1≥28%, and the strain hardening index N of the reinforcing plate is N≥0.25.

[0007] According to the battery device provided in the embodiments of this application, by setting the reinforcing plate with e1≥28% and N≥0.25, the hardness, tensile strength and yield strength of the protective plate of the battery device are improved under repeated external impacts or loads due to the high N value. At the same time, the protective plate also has good elongation after fracture, and can produce large plastic deformation under the action of external impact loads. Thus, it is beneficial to reduce the risk of deformation of the protective plate and also to reduce the risk of breakage of the protective plate.

[0008] According to some embodiments of this application, the tensile strength of the reinforcing plate is σ. a The yield strength of the reinforcing plate is σ. b e1≥40%, N≥0.27, σ a ≥900MPa, σ b ≥420Mpa.

[0009] In the above scheme, by setting e1≥40%, N≥0.27, σ a ≥900MPa, σ bA pressure of ≥420 MPa is beneficial for further improving the protective plate's ability to resist external impacts, vibrations, and other loads, and for further reducing the risk of deformation or cracking of the protective plate under external loads.

[0010] According to some embodiments of this application, the tensile strength of the reinforcing plate is σ. a The yield strength of the reinforcing plate is σ. b , σ a ≥1200MPa, σ b ≥600Mpa.

[0011] In the above scheme, by setting σ a ≥1200MPa, σ b A pressure of ≥600 MPa is beneficial for further improving the protective plate's ability to withstand external impacts, vibrations, and other loads, and further helps reduce the risk of deformation or permanent failure of the protective plate under external loads on the battery device.

[0012] According to some embodiments of this application, the plastic strain ratio R of the reinforcing plate satisfies: R≥0.8.

[0013] In the above scheme, by setting the plastic strain ratio R of the reinforcing plate to be ≥0.8, it is beneficial to improve the uniformity of the properties of the protective plate in all directions and reduce the risk of the protective plate cracking under external load.

[0014] According to some embodiments of this application, the reinforcing plate is a steel plate, and the carbon content in the reinforcing plate is 0.07% to 0.12% by mass.

[0015] In the above scheme, by setting the reinforcing plate as a steel plate, and the carbon content in the reinforcing plate is 0.07% to 0.12%, it is easy to achieve the elongation after fracture e1≥28% and the strain hardening index N≥0.25 of the protective plate 20, and it is beneficial to improve the tensile strength and yield strength of the protective plate 20.

[0016] According to some embodiments of this application, the surface roughness Ra of at least one side of the reinforcing plate facing the first fiber resin layer satisfies: 0.05μm≤Ra≤0.5μm.

[0017] In the above scheme, by setting 0.05μm≤Ra≤0.5μm, it is beneficial to improve the bonding strength between the reinforcing plate and the first fiber resin layer, reduce the risk of the first fiber resin layer falling off, simplify the production process of the protective plate, and improve the structural strength and load-bearing capacity of the protective plate.

[0018] According to some embodiments of this application, the thickness h1 of the reinforcing plate satisfies: 0.3mm≤h1≤3mm.

[0019] In the above scheme, by setting 0.3mm≤h1≤3mm, the structural strength of the protective plate can meet the relevant requirements, while also improving the energy density of the battery device.

[0020] According to some embodiments of this application, the mass content of fibers in the first fiber resin layer is greater than or equal to 50%, and the thickness h2 of the first fiber resin layer satisfies: 0.5mm≤h2≤2.5mm.

[0021] In the above scheme, by setting the mass content of the first fiber resin layer to be greater than or equal to 50%, and the thickness h2 of the first fiber resin layer to satisfy: 0.5mm≤h2≤2.5mm, it is beneficial to improve the structural strength of the first fiber resin layer and its protective effect on the reinforcing plate, thereby reducing the risk of corrosion of the reinforcing plate and also improving the energy density of the battery device.

[0022] According to some embodiments of this application, the first fiber resin layer includes at least one first unidirectional fiber and at least one second unidirectional fiber. The first unidirectional fiber extends along a first direction, and the second unidirectional fiber extends along a second direction. The first direction is perpendicular to the second direction, and the number of layers of the second unidirectional fiber is greater than the number of layers of the first unidirectional fiber.

[0023] In the above scheme, by setting the number of layers of second unidirectional fibers in the first fiber resin layer to be greater than the number of layers of first unidirectional fibers, it is beneficial to improve the tensile strength and elastic modulus of the first fiber resin layer along the second direction. During the process of the vehicle traveling along the first direction, it is beneficial to improve the first fiber resin layer's ability to withstand greater scraping force along the first direction, thereby reducing the risk of the protective plate deforming or breaking due to scraping.

[0024] According to some embodiments of this application, along the second direction, the tensile strength σ of the first fiber resin layer c ≥300MPa, along the second direction, the elastic modulus E1 of the first fiber resin layer is ≥15MPa.

[0025] In the above scheme, the first fiber resin layer has high tensile strength and elastic modulus along the second direction, which makes it easier for the first fiber resin layer to withstand large forces perpendicular to the first direction. During the operation of the battery device along the first direction, it further helps to reduce the risk of deformation or breakage of the first fiber resin layer due to scratches.

[0026] According to some embodiments of this application, along the first direction, the tensile strength σ of the first fiber resin layer... d ≤280MPa, the elastic modulus E2 of the first fiber resin layer is ≥10MPa.

[0027] In the above scheme, by setting the tensile strength σ of the first fiber resin layer along the first direction...d If the elastic modulus of the first fiber resin layer is ≤280MPa and the elastic modulus E2≥10MPa, then the number of first unidirectional fibers laid in the first fiber resin layer along the first direction can be reduced. This not only meets the mechanical requirements of the first fiber resin layer along the first direction, but also helps to reduce the production cost of the protective plate.

[0028] According to some embodiments of this application, the protective plate is disposed below the housing along the direction of gravity, and the first fiber resin layer is disposed at least on the side of the reinforcing plate facing away from the battery cell.

[0029] In the above solution, during vehicle operation, the first fiber resin layer can withstand the scraping force of obstacles on the road surface, and the first fiber resin layer can provide good protection for the reinforcing plate, which helps to reduce the risk of wear and tear on the reinforcing plate, as well as the risk of corrosion.

[0030] According to some embodiments of this application, a first fiber resin layer is provided on both sides of the reinforcing plate along the thickness direction.

[0031] In the above scheme, both sides of the reinforcing plate along the thickness direction are covered by the first fiber resin layer, which further helps to reduce the risk of corrosion of the reinforcing plate caused by contact with external water, oxygen, etc.

[0032] According to some embodiments of this application, the protective plate further includes a resin frame portion surrounding the periphery of the reinforcing plate and integrally formed with the first fiber resin layer.

[0033] In the above scheme, the resin frame surrounds the periphery of the reinforcing plate, and the first fiber resin layer is disposed on at least one side of the reinforcing plate along the thickness direction. The resin frame protects the end face of the periphery of the reinforcing plate, and the first fiber resin layer protects at least one side of the reinforcing plate along the thickness direction, which helps to further reduce the risk of corrosion of the reinforcing plate.

[0034] According to some embodiments of this application, a first fiber resin layer is provided on both sides of the reinforcing plate and the resin frame along the thickness direction, and the resin frame and the first fiber resin layers on both sides along the thickness direction are integrally formed.

[0035] In the above scheme, the resin frame surrounds the periphery of the reinforcing plate, and the first fiber resin layer is disposed on both sides of the reinforcing plate along the thickness direction. By covering the surface of the reinforcing part with the resin frame and the first fiber resin layer on both sides of the thickness direction, the risk of the reinforcing plate coming into contact with external water, oxygen, etc. is reduced, which further helps to reduce the risk of the reinforcing plate being corroded and improves the reliability of the protective plate.

[0036] Secondly, the electrical device provided in the embodiments of this application includes the battery device provided in the above embodiments, and the battery device is used to provide electrical energy.

[0037] The power device provided in this application embodiment has the same technical effect as the battery device provided in any of the above embodiments, and will not be described again here.

[0038] According to some embodiments of this application, the first fiber resin layer includes at least one first unidirectional fiber and at least one second unidirectional fiber. The first unidirectional fiber extends along a first direction, and the second unidirectional fiber extends along a second direction. The first direction is perpendicular to the second direction. The number of layers of the second unidirectional fiber is greater than the number of layers of the first unidirectional fiber. The electrical device moves forward or backward along the first direction.

[0039] In the above scheme, by setting the number of layers of second unidirectional fibers in the first fiber resin layer to be greater than the number of layers of first unidirectional fibers, it is beneficial to improve the tensile strength and elastic modulus of the first fiber resin layer along the second direction. During the process of the electrical device traveling along the first direction, it is beneficial to improve the first fiber resin layer's ability to withstand greater scraping force along the first direction, thereby reducing the risk of the protective plate deforming or breaking due to scraping.

[0040] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the exploded structure of a battery device provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of the exploded structure of the protective plate in the battery device provided in the embodiments of this application;

[0045] Figure 4 This is a cross-sectional view of the protective plate in the battery device provided in the embodiments of this application;

[0046] Figure 5 This is a schematic diagram showing the number of unidirectional fiber layers in the first fiber resin layer of the battery device provided in the embodiments of this application.

[0047] The accompanying drawings are not drawn to scale.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1-Vehicle;

[0050] 10 - Battery assembly; 11 - Housing; 111 - First sub-housing; 112 - Second sub-housing;

[0051] 20 - Protective plate; 21 - First fiber resin layer; 211 - First unidirectional fiber; 212 - Second unidirectional fiber; 22 - Reinforcing plate; 23 - Resin frame;

[0052] 30-cell battery;

[0053] X - First direction; Y - Second direction; Z - Thickness direction. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0056] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0059] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0060] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0061] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0062] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0063] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0064] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0065] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0066] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0067] Battery packs typically consist of a housing and a protective plate. The housing houses the individual battery cells and components such as the battery management system. The protective plate is usually attached to the housing to provide protection for the housing, the battery cells, and related components, reducing the risk of damage to the battery cells from external stresses, impacts, and vibrations. In related technologies, the protective plate is prone to breakage, twisting, and deformation under external scrapes, impacts, or vibrations, which severely affects the reliability of the battery pack.

[0068] In view of this, the battery device provided in this application embodiment includes a housing, battery cells, and a protective plate. The battery cells are housed in the housing, and the protective plate is connected to the housing. The protective plate includes a first fiber resin layer and a reinforcing plate. The first fiber resin layer is disposed on at least one side of the reinforcing plate along its thickness direction. The elongation after fracture of the reinforcing plate is e1 ≥ 28%, and the strain hardening index N ≥ 0.25. By setting the reinforcing plate to e1 ≥ 28% and N ≥ 0.25, the battery device provided in this application embodiment, due to the high N value, exhibits improved hardness, tensile strength, and yield strength under repeated external impacts or loads. Simultaneously, the protective plate possesses good elongation after fracture, enabling it to undergo significant plastic deformation under external impact loads. This reduces both the risk of deformation and the risk of breakage of the protective plate.

[0069] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0070] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application. This application provides an electrical device that uses a battery device as its power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0071] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0072] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1.

[0073] Vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of vehicle 1 during starting, navigation, and driving. In some embodiments of this application, the battery device 10 can not only serve as the operating power source of vehicle 1, but also as the driving power source of vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1.

[0074] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of this application. The battery device 10 includes a housing 11 and battery cells 30, with the battery cells 30 housed within the housing 11. The housing 11 provides space for the battery cells 30, and the housing 11 can adopt various structures.

[0075] In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, the first sub-housing 111 and the second sub-housing 112 covering each other, the first sub-housing 111 and the second sub-housing 112 together defining a receiving space for accommodating the battery cell 30. The second sub-housing 112 may be a hollow structure with one end open, and the first sub-housing 111 may be a plate-like structure, the first sub-housing 111 covering the open side of the second sub-housing 112, so that the first sub-housing 111 and the second sub-housing 112 together define the receiving space; the first sub-housing 111 and the second sub-housing 112 may also be hollow structures with one side open, the open side of the first sub-housing 111 covering the open side of the second sub-housing 112.

[0076] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0077] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0078] Firstly, such as Figure 2 and Figure 3 As shown, the battery device 10 provided in this application embodiment includes a housing 11, a battery cell 30, and a protective plate 20. The battery cell 30 is housed in the housing 11, and the protective plate 20 is connected to the housing 11. The protective plate 20 includes a first fiber resin layer 21 and a reinforcing plate 22. The first fiber resin layer 21 is disposed on at least one side of the reinforcing plate 22 along the thickness direction Z. The elongation after fracture of the reinforcing plate 22 is ≥28%, and the strain hardening index N of the reinforcing plate 22 is ≥0.25.

[0079] The protective plate 20 is connected to the box body 11. Optionally, the protective plate 20 can be connected to the box body 11 above or below along the direction of gravity. Of course, the protective plate 20 can also be connected to both the box body 11 above and below along the direction of gravity.

[0080] The protective plate 20 includes a first fiber resin layer 21 and a reinforcing plate 22. Optionally, the reinforcing plate 22 can be a metal plate or the like, to provide good protection for the battery cell 30. The first fiber resin layer 21 can be disposed on either side of the reinforcing plate 22 along the thickness direction Z, or the first fiber resin layer 21 can be disposed on both sides of the reinforcing plate 22 along the thickness direction Z. For example, the first fiber resin layer 21 can be disposed on at least the side of the reinforcing plate 22 opposite to the battery cell 30. The first fiber resin layer 21 can provide a certain degree of protection for the reinforcing plate 22, reducing the risk of corrosion of the reinforcing plate 22 under the influence of water, oxygen, etc. in the external environment.

[0081] Elongation after fracture is the percentage of the specimen's elongation after fracture in a tensile test compared to its original length. It reflects the material's ability to undergo permanent plastic deformation before fracture and is a key parameter for evaluating material ductility. For testing methods of elongation after fracture, please refer to GB / T228.1-2021 "Metallic materials, tensile testing—Part 1: Test at room temperature". It is understandable that the larger the elongation after fracture e1 of the reinforcing plate 22, the better its ductility will be under external loads such as impact and vibration, and the lower its risk of fracture.

[0082] The strain hardening exponent N is an important parameter describing the degree of hardening of a material during plastic deformation. It describes the material's ability to gradually increase in strength due to the impeded movement of dislocations during plastic deformation. It reflects the material's ability to resist further deformation in the uniform plastic deformation stage and is a key indicator for evaluating the work hardening characteristics of materials. Understandably, a larger N value indicates a stronger strain hardening ability, resulting in a greater increase in the material's strength during plastic deformation, which is beneficial for improving the material's ability to undergo uniform plastic deformation.

[0083] The reinforcing plate 22 has a high N value, so it can absorb energy through plastic deformation under overload, thereby improving the impact resistance of the protective plate 20. The method for determining the N value of the reinforcing plate 22 can be found in GB / T 5028-2008 "Determination of Tensile Strain Hardening Index (n value) of Thin Plates and Strips of Metallic Materials".

[0084] Therefore, for the reinforcing plate 22, the larger the value of its elongation after fracture e1, the greater the plastic deformation that the protective plate 20 can produce before fracture under the action of vibration, impact and other loads during the use of the battery device 10, and the less likely it is to fracture.

[0085] During the use of the battery device 10, the protective plate 20 will inevitably be subjected to repeated scratches, impacts or vibrations. The greater the strain hardening index of the reinforcing plate 22, the greater the increase in hardness, tensile strength or yield strength under repeated external loads, and the less likely it is to deform.

[0086] To this end, the inventors conducted a series of experiments, performing bottom ball tests on different battery devices 10. In the tests, only the elongation after fracture e1 and strain hardening index N of the reinforcing plate 22 of different battery devices 10 were changed, while other parameters remained unchanged. The test method referred to GB 38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles". The ball head shape was a hemispherical shape with a diameter of 30 mm, the ball head mass was 10 kg, and the ball head material was 45 steel. Different impact energies were provided to the reinforcing plate 22 along the thickness direction Z of the reinforcing plate 22. The test results are shown in Table 1 below.

[0087] Table 1. Influence of elongation at break e1 and strain hardening index N of reinforcing plate 22 of battery device 10 on bottom ball test

[0088]

[0089] As shown in Table 1 above, with the elongation after fracture e1 of the reinforcing plate 22 being 28% and the strain hardening index N being 0.25, the protective plate 20 can withstand an impact energy of 280J in the bottom ball test without breaking. Furthermore, through long-term practical experience, the inventors have discovered that if the protective plate 20 can withstand an impact energy of 280J, it can withstand impact loads under various working conditions without deformation or cracking.

[0090] Therefore, after systematic analysis and long-term practice, the inventors found that by setting the reinforcing plate 22 with e1≥28% and N≥0.25, it is beneficial to improve the impact resistance of the protective plate 20 and reduce the risk of the protective plate 20 breaking.

[0091] The battery device 10 provided in this application embodiment has a reinforcing plate 22 with e1≥28% and N≥0.25. Due to the high N value, the hardness, tensile strength and yield strength of the protective plate 20 of the battery device 10 are improved under repeated external impacts or loads. At the same time, the protective plate 20 has good elongation after fracture, and can produce large plastic deformation under external impact loads. This helps to reduce the risk of deformation of the protective plate 20 and also helps to reduce the risk of breakage of the protective plate 20.

[0092] In some embodiments, the tensile strength of the reinforcing plate 22 is σ. a The yield strength of reinforcing plate 22 is σ. b e1≥40%, N≥0.27, σ a ≥900MPa, σ b ≥420Mpa.

[0093] As shown in Table 1 above, when e1 is 40% and N is 0.27, the protective plate 20 of the battery device 10 can withstand at least 300J of impact energy. Therefore, when e1≥40% and N≥0.27, the battery device 10 can withstand higher impact, vibration and other loads.

[0094] Tensile strength reflects the maximum stress a material can withstand before breaking, while yield strength reflects the material's ability to resist minute plastic deformation. By setting the σ of the reinforcing plate 22... a ≥900MPa, σ b A tensile strength of ≥420 MPa is beneficial for improving the tensile strength of the reinforcing plate 22 and its ability to resist permanent deformation under external forces. Optionally, the raw material of the reinforcing plate 22 can be high-toughness steel, which has high toughness.

[0095] Therefore, through systematic analysis and long-term practice, the inventors discovered that by setting e1≥40%, N≥0.27, σ a ≥900MPa, σ b A load of ≥420 MPa is beneficial to further improve the protective plate 20's ability to resist external impacts, vibrations, and other loads, and to further reduce the risk of deformation or cracking of the protective plate 20 under external loads.

[0096] In some embodiments, the tensile strength of the reinforcing plate 22 is σ. a The yield strength of reinforcing plate 22 is σ. b , σ a ≥1200MPa, σ b ≥600Mpa.

[0097] Due to σ a ≥1200MPa, σ b With a stress ≥600 MPa, the reinforcing plate 22 can withstand greater external stress and generate higher plastic deformation. This means that under external loads such as impact and vibration, the reinforcing plate 22 can absorb higher energy and thus withstand greater impact forces. Optionally, the raw material of the reinforcing plate 22 can be high-energy-absorbing steel, etc.

[0098] Therefore, after systematic analysis and long-term practice, the inventors discovered that by setting σ... a ≥1200MPa, σ b A pressure of ≥600 MPa is beneficial to further improve the ability of the protective plate 20 to withstand external impacts, vibrations and other loads, and further reduces the risk of deformation or permanent failure of the protective plate 20 under external loads on the battery device 10.

[0099] In some embodiments, the plastic strain ratio R of the reinforcing plate 22 satisfies: R≥0.8.

[0100] The plastic strain wall R reflects the difference in the deformation capacity of a material in the thickness direction Z and the width direction during plastic deformation, which affects the material's resistance to splitting and the uniformity of forming.

[0101] The plastic strain ratio R of the reinforcing plate 22 is ≥0.8. For example, R ≥1 can be set, so that the performance difference between the reinforcing plate along the thickness direction Z and the width square is small, and the isotropic effect during the molding process is better.

[0102] The method for determining the plastic strain ratio R of the reinforcing plate 22 can be referred to GB / T 5027 "Determination of Plastic Strain Ratio (r value) of Thin Plates and Strips of Metallic Materials".

[0103] To this end, the inventors conducted a series of tests on different battery devices 10. In the tests, only the plastic strain ratio R of the reinforcing plate 22 of different battery cells 30 was changed, while other parameters remained unchanged. The test results are shown in Table 2.

[0104] Table 2 shows the effect of different plastic strain ratios R of the reinforcing plate 22 of the battery device 10 on the bottom ball test.

[0105] Plastic strain ratio R Bottom ball test results Comparative Example 1 0.6 It fractured under an impact energy of 270J. Comparative Example 2 0.7 It fractured under an impact energy of 280J. Example 1 0.8 Impact energy 300J, no fracture Example 2 0.9 Impact energy 300J, no fracture Example 3 1 Impact energy 300J, no fracture Example 4 1.2 Impact energy 300J, no fracture

[0106] As shown in Table 2 above, when the plastic strain ratio R of the reinforcing plate 22 is 0.8, the reinforcing plate 22 can withstand an impact energy of 300J, which meets the requirements of the relevant standards for the bottom ball test of the protective plate 20.

[0107] Through systematic analysis and long-term practice, the inventors discovered that by setting the plastic strain ratio R of the reinforcing plate 22 to be ≥0.8, it is beneficial to improve the uniformity of the properties of the protective plate 20 in all directions and reduce the risk of the protective plate 20 cracking under external loads.

[0108] The reinforcing plate 22 and the first fiber resin layer 21 can be formed by hot pressing. Specifically, the resin material in the first fiber resin layer 21 can melt under high temperature and be fused together with the reinforcing plate 22 during the curing process. In the hot pressing process, the first fiber resin layer 21 can be directly composited with the reinforcing plate 22, or an adhesive film layer can be provided between the reinforcing plate 22 and the first fiber resin layer 21 to achieve composite connection between the reinforcing plate 22 and the first fiber resin layer 21.

[0109] In some embodiments, the reinforcing plate 22 is a steel plate, and the carbon content in the reinforcing plate 22 is 0.07% to 0.12% by mass.

[0110] Specifically, a nickel-saving austenitic stainless steel billet can be used as raw material. The carbon content in the billet can be 0.07% to 0.12% by mass. The billet is then subjected to a series of processes such as hot rolling, cold rolling, and stamping to finally form a reinforcing plate 22 in the protective plate 20 with a carbon content of 0.07% to 0.12% by mass. After the reinforcing plate 22 is combined with the first fiber resin layer 21, the resulting protective plate 20 can meet the following requirements: elongation after fracture e1 ≥ 28%, strain hardening index N ≥ 0.25. Furthermore, by setting the carbon content in the protective plate 20 to 0.07% to 0.12% by mass, it is beneficial to improve the tensile strength and yield strength of the reinforcing plate 22.

[0111] Therefore, by setting the reinforcing plate 22 as a steel plate, and the carbon content in the reinforcing plate 22 is 0.07% to 0.12%, it is easy to achieve the elongation after fracture e1≥28% and the strain hardening index N≥0.25 of the protective plate 20, and it is beneficial to improve the tensile strength and yield strength of the protective plate 20.

[0112] In some embodiments, the surface roughness Ra of the reinforcing plate 22 on at least one side facing the first fiber resin layer 21 satisfies: 0.05μm≤Ra≤0.5μm.

[0113] Optionally, Ra can be 0.05μm, 0.1μm, 0.15μm, 0.2μm, 0.25μm, 0.3μm, 0.35μm, 0.4μm, 0.45μm or 0.5μm, etc.

[0114] Understandably, a higher surface roughness Ra on the side of the reinforcing plate 22 facing the first fiber resin layer 21 is more beneficial for improving the bonding strength between the reinforcing plate 22 and the first fiber resin layer 21 during hot pressing, thus reducing the risk of cracking between the first fiber resin layer 21 and the reinforcing plate 22. When the bonding strength between the first fiber resin layer 21 and the reinforcing plate 22 is sufficiently high, the adhesive film layer between the reinforcing plate 22 and the first fiber resin layer 21 can be omitted during the hot pressing process, thereby simplifying the production process of the protective plate 20. Conversely, a lower Ra is more beneficial for increasing the effective thickness of the reinforcing plate 22, thereby improving the structural strength and load-bearing capacity of the reinforcing portion.

[0115] To this end, the inventors conducted a series of tests on different protective plates 20. In the tests, only the surface roughness of the reinforcing plate 22 in the different protective plates 20 was changed; all parameters of the first fiber resin layer 21 remained the same. The measured bonding strength between the reinforcing plate 22 and the first fiber resin layer 21 is shown in Table 2 below. Table 3 shows the effect of the surface roughness of the reinforcing plate 22 on the bonding strength between the reinforcing plate 22 and the first fiber resin layer 21.

[0116]

[0117] As shown in Table 3 above, in the comparative examples where the surface roughness Ra of the reinforcing plate is less than 0.05 μm, the maximum bonding strength between the reinforcing plate 22 and the first fiber resin layer 21 is 140 MPa, which is relatively low. However, in the embodiment where the surface roughness Ra of the reinforcing plate reaches 0.05 μm, the minimum bonding strength between the reinforcing plate 22 and the first fiber resin layer 21 is 150 MPa, which just meets the bonding strength requirements of the protective plate 20 for the reinforcing plate 22 and the first fiber resin layer 21.

[0118] As the surface roughness Ra of the reinforcing plate increases further, when Ra reaches 0.5 μm or more, the bonding strength between the reinforcing plate 22 and the first fiber resin layer 21 further decreases, reaching a maximum of 150 MPa, which cannot meet the relevant requirements.

[0119] Therefore, after systematic analysis and long-term practice, the inventors found that by setting 0.05μm≤Ra≤0.5μm, it is beneficial to improve the bonding strength between the reinforcing plate 22 and the first fiber resin layer 21, reduce the risk of the first fiber resin layer 21 falling off, simplify the production process of the protective plate 20, and improve the structural strength and load-bearing capacity of the protective plate 20.

[0120] In some embodiments, such as Figure 4 As shown, the thickness h1 of the reinforcing plate 22 satisfies: 0.3mm≤h1≤3mm.

[0121] Optionally, h1 can be 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, etc.

[0122] It is understandable that the greater the thickness h1 of the reinforcing plate 22, the better it is to improve the structural strength and load-bearing capacity of the reinforcing plate 22. On the other hand, the smaller the thickness of the reinforcing plate 22, the better it is to reduce the weight of the protective plate 20 and improve the energy density of the battery device 10.

[0123] Therefore, after systematic analysis and long-term practice, the inventors found that by setting 0.3mm≤h1≤3mm, the structural strength of the protective plate 20 can meet the relevant requirements, while also improving the energy density of the battery device 10.

[0124] In some embodiments, such as Figure 4 As shown, the fiber content in the first fiber resin layer 21 is greater than or equal to 50%, and the thickness h2 of the first fiber resin layer 21 satisfies: 0.5mm≤h2≤2.5mm.

[0125] It is understandable that a higher fiber content in the first fiber resin layer 21 is more beneficial to improving the structural strength of the first fiber resin layer 21. A larger thickness h2 in the first fiber resin layer 21 is also more beneficial to improving its structural strength and its protective capability against the reinforcing plate 22. Conversely, a smaller h2 is more beneficial to reducing the weight of the protective plate 20, thereby improving the energy density of the battery device 10.

[0126] Therefore, after systematic analysis and long-term practice, the inventors discovered that by setting the fiber content in the first fiber resin layer 21 to be greater than or equal to 50%, and the thickness h2 of the first fiber resin layer 21 to satisfy: 0.5mm≤h2≤2.5mm, it is beneficial to improve the structural strength of the first fiber resin layer 21 and its protective effect on the reinforcing plate 22, thereby reducing the risk of corrosion of the reinforcing plate 22 and also improving the energy density of the battery device 10.

[0127] In some embodiments, such as Figure 4 and Figure 5 As shown, the first fiber resin layer 21 includes at least one first unidirectional fiber 211 and at least one second unidirectional fiber 212. The first unidirectional fiber 211 extends along the first direction X, and the second unidirectional fiber 212 extends along the second direction Y. The first direction X is perpendicular to the second direction Y, and the number of layers of the second unidirectional fiber 212 is greater than the number of layers of the first unidirectional fiber 211.

[0128] After the battery device 10 is installed on the vehicle 1, it usually moves forward or backward in one direction. Therefore, the protective plate 20 will bear more of the scraping force along the forward or backward direction of the vehicle 1.

[0129] By setting the first fiber resin layer 21 to include at least one first unidirectional fiber 211 and at least one second unidirectional fiber 212, and the number of layers of the second unidirectional fiber 212 is greater than the number of layers of the first unidirectional fiber 211, the second unidirectional fiber 212 has a strengthening effect on the tensile strength and yield strength of the first fiber resin layer 21 along the second direction Y, so that the first fiber resin layer 21 has higher tensile strength and elastic modulus along the second direction Y, so that the protective plate 20 can withstand larger scratching forces perpendicular to the second direction Y, etc.

[0130] Therefore, by setting the number of layers of second unidirectional fibers 212 in the first fiber resin layer 21 to be greater than the number of layers of first unidirectional fibers 211, it is beneficial to improve the tensile strength and elastic modulus of the first fiber resin layer 21 along the second direction Y. During the process of the vehicle 1 traveling along the first direction X, it is beneficial to improve the first fiber resin layer 21's ability to withstand greater scraping force along the first direction X, thereby reducing the risk of the protective plate 20 deforming or breaking due to scraping.

[0131] In some embodiments, along the second direction Y, the tensile strength σ of the first fiber resin layer 21 c ≥300MPa, along the second direction Y, the elastic modulus E1 of the first fiber resin layer 21 is ≥15MPa.

[0132] Thus, the first fiber resin layer 21 has high tensile strength and elastic modulus along the second direction Y, which makes it easier for the first fiber resin layer 21 to withstand large forces perpendicular to the first direction X. During the operation of the battery device 10 along the first direction X, it further helps to reduce the risk of deformation or breakage of the first fiber resin layer 21 due to scratches.

[0133] In some embodiments, along the first direction X, the tensile strength σ of the first fiber resin layer 21 is... d ≤280MPa, the elastic modulus E2 of the first fiber resin layer 21 is ≥10MPa.

[0134] During the operation of the battery device 10 along the first direction X, it mainly bears the scraping force along the first direction X. Therefore, the first fiber resin layer 21 has higher requirements for tensile strength and elastic modulus perpendicular to the first direction X, while the requirements for tensile strength and elastic modulus of the first fiber resin layer 21 along the first direction X are smaller.

[0135] By setting the tensile strength σ of the first fiber resin layer 21 along the first direction X, d If the elastic modulus E2 of the first fiber resin layer 21 is ≤280MPa and the elastic modulus E2 of the first fiber resin layer 21 is ≥10MPa, then the number of first unidirectional fibers 211 laid along the first direction X of the first fiber resin layer 21 can be reduced. While meeting the mechanical requirements of the first fiber resin layer 21 along the first direction X, it is beneficial to reduce the production cost of the protective plate 20.

[0136] In some embodiments, the protective plate 20 is disposed below the housing 11 along the direction of gravity, and the first fiber resin layer 21 is disposed at least on the side of the reinforcing plate 22 facing away from the battery cell 30.

[0137] The protective plate 20 is located below the box 11 along the direction of gravity, so as to protect the box 11 below the direction of gravity.

[0138] Optionally, the first fiber resin layer 21 may be provided only on the side of the reinforcing plate 22 facing away from the battery cell 30, or the first fiber resin layer 21 may be provided on both the side of the reinforcing plate 22 facing away from the battery cell 30 and the side facing the battery cell 30.

[0139] The first fiber resin layer 21 is disposed on the side of the reinforcing plate 22 facing away from the battery cell 30. If the first fiber resin layer 21 is disposed on the side of the reinforcing plate 22 facing the ground, then the vehicle 1 can withstand the scraping force of obstacles on the road surface through the first fiber resin layer 21 during driving. The first fiber resin layer 21 can provide good protection for the reinforcing plate 22, which helps to reduce the risk of wear and tear on the reinforcing plate 22, and also helps to reduce the risk of corrosion on the reinforcing plate 22.

[0140] In some embodiments, such as Figure 4 As shown, the reinforcing plate 22 has a first fiber resin layer 21 on both sides along the thickness direction Z.

[0141] Thus, both sides of the reinforcing plate 22 along the thickness direction Z are covered by the first fiber resin layer 21, which further helps to reduce the risk of corrosion of the reinforcing plate 22 caused by contact with external water, oxygen, etc.

[0142] In some embodiments, such as Figure 4 As shown, the protective plate 20 also includes a resin frame portion 23, which surrounds the periphery of the reinforcing plate 22 and is integrally formed with the first fiber resin layer 21.

[0143] The resin frame portion 23 and the first fiber resin layer 21 are integrally formed. Optionally, the resin frame portion 23 and the first fiber resin layer 21 can be fused together by a hot pressing process. Specifically, the blank of the resin frame portion 23 is arranged around the periphery of the reinforcing plate 22, and the thickness of the resin frame portion 23 can be equal to the thickness of the reinforcing plate 22. The material of the first fiber resin layer 21 is laid on at least one side of the reinforcing portion and the resin frame portion 23 along the thickness direction Z. Then, in the hot pressing process, the resin frame portion 23 is fused to the periphery of the reinforcing plate 22, and the first fiber resin layer 21 is fused to at least one side of the reinforcing portion and the resin frame portion 23 along the thickness direction Z.

[0144] Thus, the resin frame portion 23 surrounds the periphery of the reinforcing plate 22, and the first fiber resin layer 21 is disposed on at least one side of the reinforcing plate 22 along the thickness direction Z. The resin frame portion 23 protects the end face of the periphery of the reinforcing plate 22, and the first fiber resin layer 21 protects at least one side of the reinforcing plate 22 along the thickness direction Z, which helps to further reduce the risk of corrosion of the reinforcing plate 22.

[0145] In some embodiments, such as Figure 4 As shown, the reinforcing plate 22 and the resin frame 23 are provided with a first fiber resin layer 21 on both sides along the thickness direction Z, and the resin frame 23 and the first fiber resin layer 21 on both sides along the thickness direction Z are integrally formed.

[0146] The resin frame portion 23 can be arranged around the periphery of the reinforcing plate 22. The resin frame portion 23 can be set with the same thickness as the reinforcing portion. The first fiber resin layer 21 is provided on both sides of the reinforcing plate 22 and the resin frame portion 23 along the thickness direction Z. The resin frame portion 23 is fused to the first fiber resin layer 21 on both sides respectively, and is fused to the periphery end face of the reinforcing plate 22.

[0147] Thus, the resin frame 23 surrounds the periphery of the reinforcing plate 22, and the first fiber resin layer 21 is disposed on both sides of the reinforcing plate 22 along the thickness direction Z. The surface of the reinforcing part is covered by the resin frame 23 and the first fiber resin layer 21 on both sides of the thickness direction Z, so as to reduce the risk of the reinforcing plate 22 coming into contact with external water, oxygen and other substances, which further helps to reduce the risk of the reinforcing plate 22 being corroded and improves the reliability of the protective plate 20.

[0148] Secondly, the electrical device provided in the embodiments of this application includes the battery device 10 provided in the above embodiments, and the battery device 10 is used to provide electrical energy.

[0149] The power supply device provided in this application embodiment has the same technical effect as the battery device 10 provided in any of the above embodiments, and will not be described again here.

[0150] In some embodiments, such as Figure 4 and Figure 5 As shown, the first fiber resin layer 21 includes at least one first unidirectional fiber 211 and at least one second unidirectional fiber 212. The first unidirectional fiber 211 extends along the first direction X, and the second unidirectional fiber 212 extends along the second direction Y. The first direction X is perpendicular to the second direction Y. The number of layers of the second unidirectional fiber 212 is greater than the number of layers of the first unidirectional fiber 211. The electrical device moves forward or backward along the first direction X.

[0151] If the number of layers of the second unidirectional fiber 212 is greater than the number of layers of the first unidirectional fiber 211, then the second unidirectional fiber 212 has a strengthening effect on the tensile strength and yield strength of the first fiber resin layer 21 along the second direction Y, so that the first fiber resin layer 21 has higher tensile strength and elastic modulus along the second direction Y, so that the protective plate 20 can withstand greater scratching force perpendicular to the second direction Y, etc.

[0152] Therefore, by setting the number of layers of second unidirectional fibers 212 in the first fiber resin layer 21 to be greater than the number of layers of first unidirectional fibers 211, it is beneficial to improve the tensile strength and elastic modulus of the first fiber resin layer 21 along the second direction Y. During the process of the electrical device traveling along the first direction X, it is beneficial to improve the first fiber resin layer 21's ability to withstand greater scraping force along the first direction X, thereby reducing the risk of the protective plate 20 deforming or breaking due to scraping.

[0153] In some embodiments, such as Figures 2 to 5 As shown, the battery device 10 provided in this embodiment includes a housing 11, a battery cell 30, and a protective plate 20. The battery cell 30 is housed within the housing 11, and the protective plate 20 is connected to the housing 11. The protective plate 20 includes a first fiber resin layer 21 and a reinforcing plate 22. The first fiber resin layer 21 is disposed on both sides of the reinforcing plate 22 along the thickness direction Z. The elongation after fracture of the reinforcing plate 22 is e1 ≥ 28%, and the strain hardening index N ≥ 0.25. The tensile strength of the reinforcing plate 22 is σ. a The yield strength of reinforcing plate 22 is σ. b , σ a ≥900MPa, σ b The plastic strain ratio R of the reinforcing plate 22 is ≥420 MPa and satisfies: R≥0.8. The surface roughness Ra of at least one side of the reinforcing plate 22 facing the first fiber resin layer 21 satisfies: 0.05 μm≤Ra≤0.5 μm. The thickness h1 of the reinforcing plate 22 satisfies: 0.3 mm≤h1≤3 mm. The fiber mass content in the first fiber resin layer 21 is greater than or equal to 50%, and the thickness h2 of the first fiber resin layer 21 satisfies: 0.5 mm≤h2≤2.5 mm. The first fiber resin layer 21 includes at least one layer of first unidirectional fiber 211 and at least one layer of second unidirectional fiber 212. The first unidirectional fiber 211 extends along the first direction X, and the second unidirectional fiber 212 extends along the second direction Y. The first direction X is perpendicular to the second direction Y, and the number of layers of second unidirectional fiber 212 is greater than the number of layers of first unidirectional fiber 211. The tensile strength σ of the first fiber resin layer 21 along the second direction Y is... c ≥300MPa, along the second direction Y, the elastic modulus E1 of the first fiber resin layer 21 is ≥15MPa. Along the first direction X, the tensile strength σ of the first fiber resin layer 21 is... d The elastic modulus E2 of the first fiber resin layer 21 is ≤280MPa and ≥10MPa. The protective plate 20 is located below the housing 11 along the direction of gravity, and the first fiber resin layer 21 is located at least on the side of the reinforcing plate 22 facing away from the battery cell 30. The protective plate 20 also includes a resin frame portion 23, which surrounds the periphery of the reinforcing plate 22 and is integrally formed with the first fiber resin layers 21 on both sides along the thickness direction Z.

[0154] The battery device 10 provided in this application embodiment has a reinforcing plate 22 with e1≥28% and N≥0.25. Due to the high N value, the hardness, tensile strength and yield strength of the protective plate 20 of the battery device 10 are improved under repeated external impacts or loads. At the same time, the protective plate 20 has good elongation after fracture, and can produce large plastic deformation under external impact loads. This helps to reduce the risk of deformation of the protective plate 20 and also helps to reduce the risk of breakage of the protective plate 20.

[0155] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and equivalent components can be substituted without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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, characterized in that, include: Box; The battery cell is housed within the casing; A protective panel is connected to the housing. The protective panel includes a first fiber resin layer and a reinforcing plate. The first fiber resin layer is disposed on at least one side of the reinforcing plate along the thickness direction. The elongation after fracture of the reinforcing plate is e1≥28%, and the strain hardening index N≥0.

25.

2. The battery device according to claim 1, characterized in that, The tensile strength of the reinforcing plate is σ. a The yield strength of the reinforcing plate is σ. b e1≥40%, N ≥0.27, σ a ≥900MPa, σ b ≥420Mpa.

3. The battery device according to claim 1, characterized in that, The tensile strength of the reinforcing plate is σ. a The yield strength of the reinforcing plate is σ. b , σ a ≥1200MPa, σ b ≥600Mpa.

4. The battery device according to claim 1, characterized in that, The plastic strain ratio R of the reinforcing plate satisfies: R≥0.

8.

5. The battery device according to claim 1, characterized in that, The reinforcing plate is a steel plate, and the carbon content in the reinforcing plate is 0.07%~0.12% by mass.

6. The battery device according to claim 1, characterized in that, The surface roughness Ra of the reinforcing plate on at least one side facing the first fiber resin layer satisfies: 0.05μm≤Ra≤0.5μm.

7. The battery device according to claim 1, characterized in that, The thickness h1 of the reinforcing plate satisfies: 0.3mm≤h1≤3mm.

8. The battery device according to claim 1, characterized in that, The fiber content in the first fiber resin layer is greater than or equal to 50%, and the thickness h2 of the first fiber resin layer satisfies: 0.5mm≤h2≤2.5mm.

9. The battery device according to claim 1, characterized in that, The first fiber resin layer includes at least one first unidirectional fiber and at least one second unidirectional fiber. The first unidirectional fiber extends along a first direction, and the second unidirectional fiber extends along a second direction. The first direction is perpendicular to the second direction, and the number of layers of the second unidirectional fiber is greater than the number of layers of the first unidirectional fiber.

10. The battery device according to claim 9, characterized in that, Along the second direction, the tensile strength σ of the first fiber resin layer c ≥300MPa, along the second direction, the elastic modulus E1 of the first fiber resin layer is ≥15MPa.

11. The battery device according to claim 9, characterized in that, Along the first direction, the tensile strength σ of the first fiber resin layer d ≤280MPa, the elastic modulus E2 of the first fiber resin layer is ≥10MPa.

12. The battery device according to claim 1, characterized in that, The protective plate is located below the box body along the direction of gravity, and the first fiber resin layer is located at least on the side of the reinforcing plate facing away from the battery cell.

13. The battery device according to claim 1, characterized in that, The reinforcing plate is provided with the first fiber resin layer on both sides along the thickness direction.

14. The battery device according to any one of claims 1 to 13, characterized in that, The protective plate also includes a resin frame portion, which surrounds the periphery of the reinforcing plate and is integrally formed with the first fiber resin layer.

15. The battery device according to claim 14, characterized in that, The reinforcing plate and the resin frame are provided with the first fiber resin layer on both sides along the thickness direction, and the resin frame and the first fiber resin layer on both sides along the thickness direction are integrally formed.

16. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 15, the battery device being used to provide electrical energy.

17. The electrical appliance according to claim 16, characterized in that, The first fiber resin layer includes at least one first unidirectional fiber and at least one second unidirectional fiber. The first unidirectional fiber extends along a first direction, and the second unidirectional fiber extends along a second direction. The first direction is perpendicular to the second direction, and the number of layers of the second unidirectional fiber is greater than the number of layers of the first unidirectional fiber. The electrical device moves forward or backward in the first direction.

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