Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a battery monomer; the protective plate is arranged on one side of the battery monomer in the first direction, the protective plate comprises a first protective layer and a resin layer, the resin layer is combined with the surface, deviating from the battery monomer, of the first protective layer, and at least part of the area, on the surface, deviating from the battery monomer, of the resin layer is 0.3-3mm higher than the first protective layer in the first direction; the elongation at break of the resin layer is larger than that of the first protective layer, and the first direction is the gravity direction. According to the technical scheme, through deformation of the resin layer, impact energy can be absorbed, the damage effect of impact on the first protection layer is reduced, when the protection plate bears large external force, the shape of the protection plate can be kept stable, the risk of overall structure failure caused by local damage can be reduced, the bearing capacity and the damage resistance of the protection plate are improved, and the service life of the protection plate is prolonged. And the scratch resistance and the impact resistance of the protective plate are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device, an electrical device, and an energy storage device. Background Art

[0002] In the field of battery technology, the impact and collision resistance of battery devices are extremely important. The protective plate is a key component set at the bottom of the battery device box. Its performance directly affects the reliability and service life of the battery device.

[0003] The protective plates of battery devices in related technologies lack structural strength. If a bottom collision occurs, the protective plates are prone to shattering and cracking, resulting in poor protective effect. The protective plates of other battery devices, while possessing a certain degree of strength, are also very rigid. At the moment of bottom impact, the protective plates themselves are unable to effectively buffer and absorb the impact energy, causing the impact energy to be directly transmitted to the battery cells inside the casing with almost no loss. This causes the battery cells and other electrical components inside the casing to be subjected to a large impact force, which can cause deformation of the battery cell casing or damage or even short circuit of the electrode assembly inside the battery cell, seriously affecting the performance and service life of the battery device. Utility Model Content

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery device, and an electrical device and energy storage device containing the battery device. The battery device can improve the load-bearing capacity, damage resistance, scratch resistance, and impact resistance of the protective plate, thereby enhancing the protective performance of the protective plate.

[0005] In the first aspect, an embodiment of the present application provides a battery device, comprising: a battery cell; a protective plate, wherein the protective plate is arranged on one side of the battery cell along a first direction, and the protective plate comprises: a first protective layer and a resin layer, wherein the resin layer is bonded to the surface of the first protective layer facing away from the battery cell, and along the first direction, the resin layer is 0.3 mm to 3 mm higher than the first protective layer in at least a portion of the area on the surface of the first protective layer facing away from the battery cell, the elongation at break of the resin layer is greater than the elongation at break of the first protective layer, and the first direction is the direction of gravity.

[0006] In the above technical solution, since the protective plate includes a first protective layer and a resin layer located on the side of the first protective layer away from the battery cell, the thickness of the resin layer is greater than or equal to 0.3 mm and less than or equal to 3 mm. During the process of being hit by the bottom ball, the resin layer deforms to absorb the impact energy and reduce the destructive effect of the impact on the first protective layer. When the protective plate is subjected to a large external force, it can maintain a stable shape and reduce the risk of overall structural failure due to local damage, thereby improving the load-bearing capacity and anti-destruction ability of the protective plate, improving the scratch resistance and impact resistance of the protective plate, and enhancing the protective ability of the protective plate.

[0007] In some embodiments, the resin layer is bonded to the surface of the first protective layer facing the battery cell. Along the first direction, at least a portion of the resin layer on the surface of the first protective layer facing the battery cell is 0.3 mm to 3 mm higher than the first protective layer.

[0008] In the above technical solution, by combining the resin layer with the surface of the first protective layer facing the battery cell, and the thickness of at least part of the area of ​​the resin layer facing the battery cell is greater than or equal to 0.3 mm and less than or equal to 3 mm, when the protective plate is impacted by external force, the resin layer facing the battery cell can effectively absorb and dissipate energy, thereby improving the impact resistance and fatigue resistance of the protective plate, extending the service life of the protective plate, and reducing the probability of penetrating perforations in the protective plate when subjected to external force, thereby improving the sealing performance of the protective plate. It can also control the material usage and weight of the resin layer facing the battery cell, reduce costs, and improve the energy density of the battery device.

[0009] In some embodiments, the first protective layer includes a metal layer.

[0010] In the above technical solution, the first protective layer includes a metal layer, which can improve the structural strength and rigidity of the protective plate and improve the protective performance of the protective plate on the battery cells.

[0011] In some embodiments, the first protective layer includes a first composite material layer, the first composite material layer is bonded to a surface of the metal layer on a side facing away from the battery cell in a first direction, and the first composite material layer is a fiber resin composite material layer.

[0012] In the above technical solution, by bonding the first composite layer to the surface of the metal layer on the side facing away from the battery cell, and the first composite layer being a fiber-resin composite material layer, the first composite layer can not only further improve the strength and rigidity of the guard plate and enhance the protective effect on the battery cell, but also have a certain absorption and buffering effect on the impact energy, thereby reducing the impact of the guard plate of the battery device on the battery cell when it is subjected to an impact.

[0013] In some embodiments, the first protective layer includes a second composite layer, the second composite layer is bonded to a surface of the metal layer facing the battery cell in the first direction, and the second composite layer is a fiber-resin composite material layer.

[0014] In the above technical solution, by arranging a second composite layer on the side of the metal layer away from the first composite layer, and the second composite layer is a fiber resin composite material layer, not only can the strength and rigidity of the protective plate be further improved, and the protective effect on the battery cell be improved, but the second composite layer can also cooperate with the first composite layer to wrap the metal layer, thereby improving the corrosion resistance of the first protective layer.

[0015] In some embodiments, the first protective layer includes a first composite material layer, and the first composite material layer is a fiber-resin composite material layer.

[0016] In the above technical solution, the first protective layer includes a first composite layer, and the first composite layer is a fiber resin composite material layer, which can ensure the strength and rigidity of the first protective layer and improve the protection effect on the battery cell. The first composite layer can also have a certain absorption and buffering effect on the impact energy, reducing the impact of the protective plate of the battery device on the battery cell when it is subjected to impact.

[0017] In some embodiments, along the first direction, the height of the resin layer on at least a portion of the surface of the first protective layer facing away from the battery cell is 0.4 mm to 2 mm higher than the first protective layer.

[0018] In the above technical solution, the resin layer is 0.4mm-2mm higher than the first protective layer in at least part of the area on the surface of the first protective layer away from the battery cell. This can reduce the material usage and weight of the resin layer and reduce costs while improving the impact resistance and fatigue resistance of the protective plate and improving the protective effect and service life of the protective plate.

[0019] In some embodiments, along the first direction, at least a portion of the resin layer on the surface of the first protective layer facing the battery cell is higher than the first protective layer by a height of 0.4 mm to 2 mm.

[0020] In the above technical solution, the resin layer is 0.4mm-2mm higher than the first protective layer in at least part of the area on the surface of the first protective layer facing the battery cell. This can reduce the material usage and weight of the resin layer and reduce costs while improving the impact resistance and fatigue resistance of the protective plate and improving the protective effect and service life of the protective plate.

[0021] In some embodiments, the elongation at break of the resin layer is greater than or equal to 50%.

[0022] In the above technical solution, by ensuring that the elongation at break of the resin layer is greater than or equal to 50%, the resin layer has sufficient toughness and can fully deform when the protective plate is subjected to external forces. As a result, the resin layer can not only effectively absorb energy, reducing energy transfer to the first protective layer and battery cells, and improving the impact resistance and cushioning performance of the protective plate, but also coordinate the deformation of the resin layer and the first protective layer, reducing the risk of cracks or debonding at the interface due to excessive deformation differences between the resin layer and the first protective layer, thereby enhancing the stability and durability of the protective plate. In addition, when cracks appear in the first protective layer, the resin layer can maintain sufficient toughness, reducing the risk of cracks and improving the sealing performance of the protective plate.

[0023] In some embodiments, the elongation at break of the resin layer is greater than or equal to 100% and less than or equal to 200%.

[0024] In the above technical solution, by making the elongation at break of the resin layer greater than or equal to 100% and less than or equal to 200%, when the protective plate is subjected to external force, the resin layer can deform moderately, effectively absorbing and dispersing energy, and reasonably transferring the load to the first protective layer, so that the resin layer and the first protective layer can work together to improve the overall bearing capacity and anti-destruction ability of the protective plate, and enhance the stability and durability of the protective plate.

[0025] In some embodiments, the first protective layer and the resin layer are connected as one body by injection molding.

[0026] In the above technical solution, by injection molding the resin layer and the first protective layer into one piece, the connection strength between the resin layer and the first protective layer can be improved, the number of parts of the guard plate can be reduced, the assembly steps can be reduced, and the assembly efficiency can be improved.

[0027] In some embodiments, the resin layer is formed with at least one process support hole, and the process support hole penetrates the resin layer along a thickness direction of the resin layer.

[0028] In the above technical solution, process support holes are formed on the resin layer, which can facilitate the support of the first protective layer at the position of the process support holes when the resin layer and the first protective layer are integrally injection molded, thereby facilitating the injection molding of the resin layer.

[0029] In some embodiments, there are multiple process support holes, and the multiple process support holes are arranged in an array; and / or the cross-section of the process support hole is circular, elliptical, or polygonal.

[0030] In the above technical solution, by setting a plurality of process support holes, the support stability of the first protective layer can be improved during the injection molding of the resin layer, the probability of the first protective layer being deflected can be reduced, and the finished product quality of the resin layer can be improved.

[0031] In some embodiments, a support member is embedded in the resin layer, and the support member is connected to the first protective layer.

[0032] In the above technical solution, by arranging a support member in the resin layer, the support member can not only support the first protective layer during injection molding of the resin layer, but also serve as a skeleton structure of the resin layer to enhance the overall performance of the resin layer.

[0033] In some embodiments, there are multiple support members, and the multiple support members are cross-connected to form a network.

[0034] In the above technical solution, by cross-connecting multiple support members into a mesh shape, the integrity of the multiple support members can be further enhanced, the support stability of the first protective layer can be further improved, and the toughness and overall stability of the resin layer can be further improved.

[0035] In some embodiments, there are multiple support members, and the multiple support members extend along the second direction and / or the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0036] In the above technical solution, multiple support members extend along the second direction and / or the third direction, so that the multiple support members can be cross-connected to form a network structure with square meshes. As a result, the structure of the multiple support members is regular, the molding is convenient, the processing efficiency is improved, and the uniformity of the distribution of the multiple support members in the resin layer is improved.

[0037] In some embodiments, the elongation at break of the support member is greater than or equal to 50%.

[0038] In the above technical solution, the support member has an elongation at break of 50% or greater. When the protective plate is subjected to external forces, the support member can fully deform, effectively absorbing energy and reducing energy transfer to the first protective layer and battery cells, thereby improving the protective plate's impact resistance and cushioning performance. Furthermore, the support member's elongation at break can be made consistent with, or approaching the same as, the elongation at break of the resin layer. This gives the combined structure of the support member and resin layer excellent toughness, allowing them to jointly absorb energy and further enhance the protective plate's impact resistance and cushioning performance.

[0039] In some embodiments, the support member is a nylon thread, a polyester thread, or a polyurethane elastic thread.

[0040] In the above technical solution, the support member is made of nylon thread, polyester thread, or polyurethane elastic thread, which can make the support member have good toughness and a relatively high elongation at break. It also helps to support the first protective layer and facilitates the injection molding of the resin layer. In addition, it can also reduce the cost of the support member.

[0041] In some embodiments, in the first direction, the thickness of the metal layer is greater than or equal to 0.2 mm and less than or equal to 1.5 mm.

[0042] In the above technical solution, since the thickness of the metal layer is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, it can not only make the metal layer have sufficient strength and rigidity, but also reduce the material usage of the metal layer, thereby reducing costs, achieving lightweight protection plates, and improving the energy density of the battery device.

[0043] In some embodiments, there are multiple battery cells, and in a projection plane perpendicular to the first direction, the projection of the metal layer at least completely covers the projections of the multiple battery cells.

[0044] In the above technical solution, in the projection plane perpendicular to the first direction, the projection of the metal layer at least completely covers the projections of multiple battery cells, which can reduce the material usage of the metal layer, lower the cost, and improve the energy density of the battery device.

[0045] In some embodiments, the elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 50%.

[0046] In the above technical solution, the elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 50%, which not only enables the first composite layer and / or the second composite layer to effectively absorb external force impact and improve the anti-destruction ability of the guard plate, but also improves the overall strength and rigidity of the guard plate, extends the service life of the guard plate, and improves the protective effect on the bottom of the box.

[0047] In some embodiments, the elongation at break of the resin in the fiber-resin composite material layer is 100%-200%.

[0048] In the above technical solution, the elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 100% and less than or equal to 200%, which can enable the first composite layer and / or the second composite layer to deform moderately when subjected to force, effectively absorb and disperse energy, and reasonably transfer the load to the first protective layer, thereby improving the impact resistance of the protective plate and enhancing the stability and durability of the protective plate.

[0049] In some embodiments, the thickness of the first composite layer is greater than or equal to 0.4 mm and less than or equal to 1.5 mm; and / or the tensile strength of the first composite layer is greater than or equal to 200 MPa; and / or the tensile modulus of the first composite layer is greater than or equal to 10 GPa.

[0050] In the above technical solution, by setting the thickness of the first composite layer to be greater than or equal to 0.4 mm and less than or equal to 1.5 mm, the tensile strength to be greater than or equal to 200 MPa, and the tensile modulus to be greater than or equal to 10 GPa, not only can the first composite layer effectively absorb and dissipate energy, thereby improving the impact resistance of the guard plate, but also the fatigue resistance of the guard plate can be enhanced, so that the guard plate maintains good stability and integrity, thereby extending the service life of the guard plate.

[0051] In some embodiments, the thickness of the second composite layer is greater than or equal to 0.2 mm and less than or equal to 1 mm; and / or the tensile strength of the second composite layer is greater than or equal to 200 MPa; and / or the tensile modulus of the second composite layer is greater than or equal to 10 GPa.

[0052] In the above technical solution, by setting the thickness of the second composite layer to be greater than or equal to 0.2 mm and less than or equal to 1 mm, the tensile strength to be greater than or equal to 200 MPa, and the tensile modulus to be greater than or equal to 10 GPa, not only can the second composite layer effectively absorb and dissipate energy, thereby improving the impact resistance of the protective plate, but also the fatigue resistance of the protective plate can be enhanced, the protective plate can maintain good stability and integrity, and the service life of the protective plate can be extended. It can also reduce the probability of penetrating perforations in the protective plate when subjected to external force, improve the sealing performance of the protective plate, reduce the thickness of the second composite layer and the amount of material used, reduce costs, and improve the energy density of the battery device.

[0053] In some embodiments, the guard plate includes a guard plate body and a flange portion, the flange portion is connected to the periphery of the guard plate body and extends in a ring shape along the circumference of the guard plate body, and the flange portion is located on the side of the guard plate body facing the battery cell in the first direction.

[0054] In the above technical solution, the guard plate includes a guard plate body and a flange portion, which not only improves the rigidity of the guard plate but also facilitates the fixed connection between the guard plate and the housing, simplifies the connection structure, and facilitates assembly. Furthermore, the fasteners connecting the housing and the guard plate do not occupy additional space beyond the underside surface of the guard plate body, resulting in a more compact and reasonable structure.

[0055] In some embodiments, the guard plate further includes: a reinforcement frame, the reinforcement frame extending in a ring shape along the circumference of the guard plate, the reinforcement frame and the flange portion being stacked in the first direction, or the reinforcement frame being embedded in the flange portion.

[0056] In the above technical solution, by setting a reinforcement frame, not only the local strength of the flange part can be improved, the connection stiffness between the guard plate and the box body can be improved, and the connection reliability and stability between the guard plate and the box body can be improved, but it can also ensure that during the locking process, the flange part can effectively compress the sealing gasket between the guard plate and the box body, thereby improving the sealing performance between the guard plate and the box body and improving the sealing performance of the battery device.

[0057] In some embodiments, in the first direction, the thickness of the flange portion is greater than the thickness of the guard plate body; or, a reinforcement structure is provided on the flange portion.

[0058] In the technical solution, the thickness of the flange part is greater than the thickness of the main body of the guard plate or a reinforcing structure is arranged on the flange part, so that the strength and rigidity of the flange part are enhanced, the connecting rigidity between the guard plate and the box is improved, the connecting reliability and stability between the guard plate and the box are improved, and the flange part of the guard plate can effectively compress the sealing gasket located between the guard plate and the box during locking, so that the sealing performance between the guard plate and the box is improved.

[0059] In some embodiments, the battery device includes a box, and the battery cell is arranged in the box. The box includes a bottom plate arranged on one side of the battery cell in a first direction. The guard plate is formed as the bottom plate, or the guard plate is arranged on a side of the bottom plate away from the battery cell.

[0060] In the technical solution, the guard plate is formed as the bottom plate of the box or arranged on a side of the bottom plate of the box away from the battery cell. When the bottom of the battery device is hit by a bottom ball, the guard plate can effectively protect the bottom of the battery device, and the impact resistance of the battery device is improved.

[0061] In a second aspect, the embodiments of the present application provide a power consumption device including the battery device according to the first aspect of the present application.

[0062] In the above-mentioned embodiments, the battery device according to the first aspect is provided. Since the guard plate of the battery device includes a first protective layer and a resin layer combined with a side surface of the first protective layer away from the battery cell, the thickness of the resin layer is 0.3mm-3mm, and the elongation at break of the resin layer is greater than that of the first protective layer. During the process of being hit by a bottom ball, the impact energy can be absorbed by the deformation of the resin layer, the damage of the first protective layer by the impact is reduced, the guard plate can maintain stable shape when bearing a large external force, and the risk of overall structure failure caused by local damage is reduced, so that the carrying capacity and damage resistance of the guard plate are improved, the scratch resistance and impact resistance of the guard plate are improved, the protection capability of the guard plate is improved, and the overall performance of the power consumption device is improved.

[0063] In a third aspect, the embodiments of the present application provide an energy storage device including the battery device according to the first aspect of the present application.

[0064] In the above embodiment, by setting the battery device of the first aspect, since the guard plate of the battery device comprises the first protective layer and the resin layer combined to the side surface of the first protective layer away from the battery monomer, the thickness of the resin layer is 0.3mm-3mm, and the breaking elongation of the resin layer is greater than the breaking elongation of the first protective layer, in the process of being hit by the bottom ball, the impact energy can be absorbed by the deformation of the resin layer, the damage of the first protective layer by the impact is reduced, the guard plate can maintain stable shape when bearing large external force, and the risk of overall structure failure caused by local damage is reduced, thereby improving the carrying capacity and damage resistance of the guard plate, improving the scratch resistance and impact resistance of the guard plate, improving the protection ability of the guard plate, and improving the overall performance of the energy storage device.

[0065] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 is a schematic view of a vehicle according to an embodiment of the application;

[0067] Figure 2 is an exploded view of a battery device according to an embodiment of the application;

[0068] Figure 3 is a structural schematic view of a guard plate according to embodiment one of the application;

[0069] Figure 4 is a sectional view along the line A-A shown in Figure 3 ;

[0070] Figure 5 is another angle structural schematic view of the guard plate shown in Figure 3 ;

[0071] Figure 6 is a structural schematic view of a guard plate according to embodiment two of the application;

[0072] Figure 7 is a sectional view along the line B-B shown in Figure 6 ;

[0073] Figure 8 is another angle structural schematic view of the guard plate shown in Figure 6 ;

[0074] Figure 9 is a structural schematic view of a guard plate according to embodiment three of the application;

[0075] Figure 10 is a sectional view along the line C-C shown in Figure 9 ;

[0076] Figure 11 yes Figure 9 A schematic structural diagram of another angle of the guard plate shown in FIG;

[0077] Figure 12 1 is a schematic structural diagram of a guard plate according to a fourth embodiment of the present application;

[0078] Figure 13 It is along Figure 12 A cross-sectional view of line DD shown in FIG;

[0079] Figure 14 This is an exploded view of the guard plate according to embodiment 5 of the present application.

[0080] Reference numerals:

[0081] 1. Electrical devices;

[0082] 1000, battery device; 2000, controller; 3000, motor;

[0083] 100, box body; 101, accommodating chamber; 10, first box body; 20, second box body;

[0084] 30. Guard plate;

[0085] 31. First protective layer;

[0086] 311, metal layer; 312, first composite material layer; 313, second composite material layer;

[0087] 32. Resin layer; 321. Process support hole;

[0088] 33. Support member;

[0089] 34. Strengthen the frame;

[0090] 301, guard plate body; 302, flange;

[0091] 200, battery cell; X, second direction; Y, third direction; Z, first direction. DETAILED DESCRIPTION

[0092] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0093] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0094] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0095] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0096] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0097] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0098] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0099] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0100] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0101] In recent years, new energy vehicles have experienced rapid development. In this field, battery devices, as the power source of electric vehicles, play an irreplaceable and important role. As a core component of new energy vehicles, battery devices have high reliability requirements.

[0102] In the field of battery technology, the impact and collision resistance of battery devices are extremely important. The protective plate is a key component set at the bottom of the battery device box. Its performance directly affects the reliability and service life of the battery device.

[0103] The protective plates of battery devices in related technologies lack structural strength. If a bottom collision occurs, the protective plates are prone to shattering and cracking, resulting in poor protective effect. The protective plates of other battery devices, while possessing a certain degree of strength, are also very rigid. At the moment of bottom impact, the protective plates themselves are unable to effectively buffer and absorb the impact energy, causing the impact energy to be directly transmitted to the battery cells inside the casing with almost no loss. This causes the battery cells and other electrical components inside the casing to be subjected to a large impact force, which can cause deformation of the battery cell casing or damage or even short circuit of the electrode assembly inside the battery cell, seriously affecting the performance and service life of the battery device.

[0104] Based on the above considerations, in order to improve the buffering and impact resistance of the protective plate, the application designs a battery device, which comprises a battery monomer and a protective plate arranged on one side of the battery monomer in the direction of gravity. The protective plate comprises a first protective layer and a resin layer combined with the first protective layer on the side away from the battery monomer. At least part of the resin layer is 0.3-3mm higher than the first protective layer in the direction of gravity, and the breaking elongation of the resin layer is greater than that of the first protective layer. During the process of being hit by a bottom ball, the impact energy can be absorbed by the deformation of the resin layer, reducing the damage of the impact to the first protective layer. When the protective plate bears a large external force, it can not only maintain stable shape, but also reduce the risk of overall structure failure caused by local damage, thereby improving the carrying capacity and damage resistance of the protective plate, improving the scratch resistance and impact resistance of the protective plate, and improving the protection capability of the protective plate.

[0105] The application embodiment provides a power consumption device using the battery device of the application as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc.

[0106] The following embodiments take the power consumption device 1 as a vehicle as an example to introduce the structure of the power consumption device 1, the battery device 1000 and the battery monomer 200 in detail.

[0107] Please refer to Figure 1 , Figure 1 The power consumption device 1 provided by some embodiments of the application is a structural schematic diagram of a vehicle. The vehicle can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle is provided with a battery device 1000, which can be arranged at the bottom, head or tail of the vehicle. The battery device 1000 can be used for power supply of the vehicle, for example, the battery device 1000 can be used as the operating power supply of the vehicle. The vehicle can also include a controller 2000 and a motor 3000, the controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, for the working power demand of the vehicle during starting, navigation and driving. In some embodiments of the application, the battery device 1000 can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0108] The following refers to Figure 2-Figure 14 to describe the battery device 1000 according to the first aspect of the application.

[0109] Please refer to Figure 2 , Figure 2 An exploded view of a battery device 1000 provided in some embodiments of the present application. The battery device 1000 includes a housing 100 and a battery cell assembly. In some embodiments, the battery device 1000 may be a battery pack, which includes the housing 100 and one or more battery cell assemblies housed within the housing 100.

[0110] The box body 100 may include a first box body 10 and a second box body 20. The first box body 10 and the second box body 20 are buckled together to form a closed space inside the box body 100 to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box body 10 may be a top cover or a bottom plate. The box body 100 may also include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box body 100 to accommodate the battery cell assembly. The box body 100 can also serve as part of the chassis structure of the vehicle. For example, the top cover of the box body 100 can become at least a part of the floor of the vehicle, or the frame of the box body 100 can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0111] The battery device 1000 may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include one or more battery cells 200. When there are multiple battery cells 200, the multiple battery cells 200 are connected in series, parallel, or in series through a busbar.

[0112] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 200. For example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 200 to form an independent module. For example, the battery module can be formed by bundling multiple battery cells 200 using cable ties.

[0113] As an example, the battery cell assembly may be a battery module, which may be housed in the housing 100 by fixing the battery module in the housing 100. As an example, the battery cell assembly may also be housed in the housing 100 by directly fixing a plurality of battery cells 200 to the housing 100.

[0114] The battery cells 200 mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. The battery cells 200 may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of the present application do not limit this. The battery cells 200 are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0115] For example, a battery cell 200 may generally include a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive and negative electrode sheets and a separator.

[0116] Figure 3 is a structural schematic diagram of the guard plate 30 according to the first embodiment of the present application; Figure 4 It is along Figure 3 A cross-sectional view of line AA shown in FIG; Figure 5 yes Figure 3 A schematic structural diagram of another angle of the guard plate 30 shown in FIG; Figure 6 is a structural diagram of the guard plate 30 according to the second embodiment of the present application; Figure 7 It is along Figure 6 A cross-sectional view of line BB shown in FIG; Figure 8 yes Figure 6 A schematic structural diagram of another angle of the guard plate 30 shown in FIG; Figure 9 is a schematic structural diagram of the guard plate 30 according to the third embodiment of the present application; Figure 10 It is along Figure 9 A cross-sectional view of the CC line shown in ; Figure 11 yes Figure 9 A schematic structural diagram of another angle of the guard plate 30 shown in FIG; Figure 12 is a structural diagram of the guard plate 30 according to the fourth embodiment of the present application; Figure 13 It is along Figure 12 A cross-sectional view of line DD shown in FIG; Figure 14 It is an exploded view of the guard plate 30 according to the fifth embodiment of the present application.

[0117] The embodiment of the present application proposes a battery device 1000, such as Figure 2-Figure 5 As shown, it includes: a battery cell 200 and a protective plate 30. Along the first direction Z, the protective plate 30 is arranged on one side of the battery cell 200. The protective plate 30 includes a first protective layer 31 and a resin layer 32. The resin layer 32 is combined with the surface of the first protective layer 31 facing away from the battery cell 200. Along the first direction Z, at least a part of the area of ​​the resin layer 32 on the surface of the first protective layer 31 facing away from the battery cell 200 is higher than the first protective layer 31 by 0.3mm-3mm. The elongation at break of the resin layer 32 is greater than the elongation at break of the first protective layer 31. The first direction Z is the direction of gravity.

[0118] In some examples, such as Figure 3 and Figure 4As shown, the protective plate 30 is disposed on one side of the battery cell 200 in the direction of gravity. The protective plate 30 includes a first protective layer 31 and a resin layer 32. The resin layer 32 and the first protective layer 31 are stacked in a first direction Z, and the resin layer 32 is located on the side of the first protective layer 31 facing away from the battery cell 200. For example, if the direction of gravity is the up-down direction, when the protective plate 30 is disposed on the upper side of the battery cell 200, the resin layer 32 is bonded to the upper surface of the first protective layer 31. When the protective plate 30 is disposed on the lower side of the battery cell 200, the resin layer 32 is bonded to the lower surface of the first protective layer 31.

[0119] The resin layer 32 possesses a certain degree of flexibility and elasticity, effectively absorbing external impacts and providing a buffering and protective effect, reducing damage to the first protective layer 31. Furthermore, the resin layer 32 can adapt to a certain degree of deformation, coordinating well with the deformation of the first protective layer 31, reducing stress concentration at the interface between the two and enhancing the stability and integrity of the protective plate 30. Furthermore, the resin layer 32 exhibits excellent corrosion and weather resistance, protecting the first protective layer 31 from environmental erosion, extending the service life of the protective plate 30, and improving its reliability under various operating conditions.

[0120] The protective plate 30 of this embodiment is provided with a resin layer 32 on the basis of the first protective layer 31. When subjected to an impact, the resin layer 32 can absorb and dissipate the impact energy by deformation, absorb and disperse external forces, reduce stress concentration, and improve the impact resistance of the protective plate 30. It can also protect the first protective layer 31 from erosion by the external environment and extend the service life of the protective plate 30.

[0121] Furthermore, the height of the resin layer 32 on the surface of the first protective layer 31 facing away from the battery cell 200 is higher than the height of the first protective layer 31, which is the thickness of the resin layer 32 in the first direction Z. In this embodiment, on the side of the first protective layer 31 facing away from the battery cell 200, the thickness of the resin layer 32 in the first direction Z may be 0.3 mm to 3 mm in only a portion of the area, or the thickness of the resin layer 32 in the first direction Z may be 0.3 mm to 3 mm in all areas.

[0122] For example, on the surface of the first protective layer 31 facing away from the battery cell 200, the thickness of the resin layer 32 in at least a portion of the area can be 0.3 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm or 3 mm.

[0123] It should be noted that when the thickness of the resin layer 32 is too small, for example, when the thickness of the resin layer 32 is less than 0.3 mm, when the protective plate 30 is impacted by external forces, the resin layer 32 cannot effectively absorb and dissipate energy. When cracks appear in the first protective layer 31, the resin layer 32 cannot effectively prevent the cracks from propagating, and the impact resistance and fatigue resistance of the protective plate 30 cannot be improved. When the thickness of the resin layer 32 is too large, for example, when the thickness of the resin layer 32 is greater than 3 mm, not only will the rigidity of the protective plate 30 be reduced, but the weight and cost of the resin layer 32 will also increase, affecting the energy density of the battery device 1000.

[0124] Therefore, in this embodiment, the thickness of the resin layer 32 of at least a portion of the surface of the side of the first protective layer 31 facing away from the battery cell 200 is set to be greater than or equal to 0.3 mm and less than or equal to 3 mm. When the protective plate 30 is impacted by external force, the resin layer 32 can effectively absorb and dissipate energy, thereby improving the impact resistance and fatigue resistance of the protective plate 30 and improving the protective effect of the protective plate 30. At the same time, the resin layer 32 can prevent cracks from expanding in the first protective layer 31, further enhancing the fatigue resistance of the protective plate 30, extending the service life of the protective plate 30, and reducing the material usage and weight of the resin layer 32, thereby reducing costs and improving the energy density of the battery device 1000.

[0125] "Elongation at break" refers to the ratio of the length (total elongation) of a material from its initial state to fracture during stretching to its original length. In this embodiment, the elongation at break of the resin layer 32 is greater than that of the first protective layer 31. This gives the resin layer 32 greater toughness and elasticity than the first protective layer 31, allowing it to deform more and absorb more energy and impact. This further enhances the resin layer's ability to absorb and disperse external forces, reduces stress concentration, and further improves the impact resistance of the protective plate 30.

[0126] In some examples, the strength of the first protective layer 31 is greater than the strength of the resin layer 32. Thus, the first protective layer 31 can withstand a large load and ensure stable support and protective function of the guard plate 30. In some examples, the first protective layer 31 is a metal plate with sufficient rigidity and strength, such as a steel plate or an aluminum alloy plate. In other examples, the first protective layer 31 can also be a composite material plate with sufficient rigidity and strength, such as a fiber-reinforced composite material plate or a sandwich composite material plate.

[0127] In this embodiment, the protective plate 30 includes a first protective layer 31 and a resin layer 32. The first protective layer 31 can withstand significant external forces and loads, effectively preventing deformation of the protective plate 30, significantly improving the puncture resistance of the protective plate 30, and maintaining the structural stability of the protective plate 30. The resin layer 32 has high toughness and elasticity, which can absorb and disperse external forces to a certain extent, reducing stress concentration. Furthermore, the excellent tensile strength of the resin layer 32 can suppress deformation of the first protective layer 31, thereby further improving the rigidity of the protective plate 30.

[0128] During a ball strike, the resin layer 32 absorbs the impact energy through its tensile deformation, damage, or fracture, reducing the damaging effects of the impact on the first protective layer 31 and improving the scratch resistance of the protective plate 30, thereby enhancing the impact resistance and protective capabilities of the protective plate 30. Under repeated loads, the resin layer 32 can alleviate fatigue stress through its own deformation, making the protective plate 30 more resistant to fatigue during long-term use, thereby improving the fatigue resistance of the protective plate 30. Furthermore, when the first protective layer 31 is a metal layer, the resin layer 32 can protect the first protective layer 31 and enhance the corrosion resistance of the protective plate 30.

[0129] Therefore, the guard plate 30 of this embodiment includes a first protective layer 31 and a resin layer 32, which can enable the guard plate 30 to maintain a stable shape when subjected to a large external force, and reduce the risk of overall structural failure due to local damage, thereby improving the load-bearing capacity and anti-destruction ability of the guard plate 30.

[0130] In the above technical solution, since the protective plate 30 includes a first protective layer 31 and a resin layer 32 located on the side of the first protective layer 31 away from the battery cell 200, the thickness of the resin layer 32 is greater than or equal to 0.3 mm and less than or equal to 3 mm. During the process of being hit by the bottom ball, the resin layer 32 deforms, which can absorb the impact energy and reduce the destructive effect of the impact on the first protective layer 31. When the protective plate 30 is subjected to a large external force, it can maintain a stable shape and reduce the risk of overall structural failure due to local damage, thereby improving the load-bearing capacity and anti-destruction ability of the protective plate 30, improving the scratch resistance and impact resistance of the protective plate 30, and enhancing the protective ability of the protective plate 30.

[0131] In some specific embodiments of the present application, along the first direction Z, at least a portion of the resin layer 32 on the surface of the first protective layer 31 facing away from the battery cell 200 is higher than the first protective layer 31 by a height of 0.4 mm to 2 mm.

[0132] For example, the resin layer 32 is higher than the first protective layer 31 by a height of 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm on at least a partial region of the surface of the first protective layer 31 away from the battery cell 200.

[0133] In the above technical solution, the resin layer 32 is higher than the first protective layer 31 by a height of 0.4 mm to 2 mm on at least a partial region of the surface of the first protective layer 31 away from the battery cell 200, which can reduce the material usage and weight of the resin layer 32 and reduce the cost while improving the impact resistance and fatigue resistance of the protective plate 30 and improving the protection effect and service life of the protective plate 30.

[0134] In some embodiments of the present application, as shown in Figure 13 and Figure 14 The resin layer 32 is also combined to the surface of the first protective layer 31 facing the battery cell 200, and along the first direction Z, the resin layer 32 is higher than the first protective layer 31 by a height of 0.3 mm to 3 mm on at least a partial region of the surface of the first protective layer 31 facing the battery cell 200.

[0135] For example, the resin layer 32 is higher than the first protective layer 31 by a height of 0.3 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, or 3 mm on at least a partial region of the surface of the first protective layer 31 facing the battery cell 200.

[0136] That is, the protective plate 30 includes one first protective layer 31 and two resin layers 32, and along the first direction Z, the two resin layers 32 are arranged on both sides of the first protective layer 31, and the height of any one resin layer 32 higher than the first protective layer 31 in the first direction Z is within the range of 0.3 mm to 3 mm.

[0137] Since the two sides of the first protective layer 31 are both provided with the resin layer 32, and the resin layers 32 on the two sides have good toughness, the two resin layers 32 on both sides of the first protective layer 31 in the first direction Z cooperate with each other, not only can jointly inhibit the deformation of the middle first protective layer 31 to improve the overall stiffness of the protective plate 30, but also can wrap the first protective layer 31 to protect the first protective layer 31 and improve the corrosion resistance of the protective plate 30.

[0138] At the same time, when being hit by a bottom ball, the resin layer 32 located on the side of the first protective layer 31 facing the battery cell 200 can not only absorb the impact energy through deformation, reduce the destructive effect of the impact on the first protective layer 31, improve the scratch resistance and impact resistance of the protective plate 30, and enhance the protective ability and service life of the protective plate 30, but also relieve fatigue stress through its own deformation, making the protective plate 30 more fatigue-resistant during long-term use, thereby improving the fatigue resistance of the protective plate 30.

[0139] In addition, when the bottom of the protective plate 30 is impacted, even if the structures of the first protective layer 31 and the resin layer 32 located on the side of the first protective layer 31 facing away from the battery cell 200 are damaged, since the fracture elongation of the resin layer 32 located on the side of the first protective layer 31 facing the battery cell 200 is greater than that of the first protective layer 31, the resin layer 32 located on the side of the first protective layer 31 facing the battery cell 200 can still maintain its shape, thereby reducing the probability of penetrating perforation of the protective plate 30 when subjected to external force, and improving the sealing performance of the protective plate 30.

[0140] In the above technical solution, by also combining the resin layer 32 with the surface of the first protective layer 31 facing the battery cell 200, and the thickness of at least part of the resin layer 32 facing the battery cell 200 is greater than or equal to 0.3 mm and less than or equal to 3 mm, when the protective plate 30 is impacted by external force, the resin layer 32 facing the battery cell 200 can effectively absorb and dissipate energy, thereby improving the impact resistance and fatigue resistance of the protective plate 30, extending the service life of the protective plate 30, and reducing the probability of penetrating perforations in the protective plate 30 when subjected to external force, thereby improving the sealing performance of the protective plate 30, and controlling the material usage and weight of the resin layer 32 facing the battery cell 200, thereby reducing costs and improving the energy density of the battery device 1000.

[0141] In some specific embodiments of the present application, along the first direction Z, at least a portion of the resin layer 32 on the surface of the first protective layer 31 facing the battery cell 200 is higher than the first protective layer 31 by a height of 0.4 mm to 2 mm.

[0142] For example, at least a portion of the resin layer 32 on the surface of the first protective layer 31 facing the battery cell 200 is 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm higher than the first protective layer 31 .

[0143] In the above technical solution, the resin layer 32 is 0.4mm-2mm higher than the first protective layer 31 in at least part of the area on the surface of the first protective layer 31 facing the battery cell 200. This can reduce the material usage and weight of the resin layer 32 and reduce costs while improving the impact resistance and fatigue resistance of the protective plate 30 and improving the protective effect and service life of the protective plate 30.

[0144] In some embodiments of the present application, Figure 13 and Figure 14 As shown, the first protection layer 31 includes a metal layer 311 .

[0145] In some examples, the first protective layer 31 may include only the metal layer 311, or may include the metal layer 311 and other non-metallic material layers (such as the first composite layer 312 and the second composite layer 313 described below). The metal layer 311 in the first protective layer 31 may be a steel plate or an aluminum alloy plate.

[0146] In the above technical solution, the first protective layer 31 includes a metal layer 311 , which can improve the structural strength and rigidity of the protective plate 30 and enhance the protective performance of the protective plate 30 on the battery cells 200 .

[0147] In some examples of this application, such as Figure 13 As shown, the thickness of the metal layer 311 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm.

[0148] For example, the thickness of the metal layer 311 may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.5 mm.

[0149] In the above technical solution, since the thickness of the metal layer 311 is greater than or equal to 0.2 mm and less than or equal to 1.5 mm, not only can the metal layer 311 have sufficient strength and rigidity, but the material usage of the metal layer 311 can also be reduced, thereby reducing costs and achieving lightweight protection plate 30, thereby improving the energy density of the battery device 1000.

[0150] In some specific examples of this application, such as Figure 2 and Figure 14 As shown, there are multiple battery cells 200 , and in a projection plane perpendicular to the first direction Z, the projection of the metal layer 311 at least completely covers the projections of the multiple battery cells 200 .

[0151] For example, within a projection plane perpendicular to the first direction Z, the projection of the metal layer 311 is exactly equal to and completely covers the projection of the multiple battery cells 200. This reduces the material usage of the metal layer 311, lowers costs, and improves the energy density of the battery device 1000. For another example, within a projection plane perpendicular to the first direction Z, the projected area of ​​the metal layer 311 is larger than the projected area of ​​the multiple battery cells 200, and the projections of the multiple battery cells 200 are completely within the projection of the metal layer 311. This further enhances the strength and effectiveness of the protection provided to the bottom of the housing 100.

[0152] In the above technical solution, in the projection plane perpendicular to the first direction Z, the projection of the metal layer 311 at least completely covers the projections of multiple battery cells 200, which can reduce the material usage of the metal layer 311, reduce costs, and improve the energy density of the battery device 1000.

[0153] In some embodiments of the present application, Figure 12 and Figure 13 As shown, the first protective layer 31 includes a first composite material layer 312 . The first composite material layer 312 is bonded to a surface of the metal layer 311 in the first direction Z facing away from the battery cell 200 . The first composite material layer 312 is a fiber-resin composite material layer.

[0154] The fiber-resin composite material layer is a high-performance material composed of fiber and resin. The fiber-resin composite material layer of the first composite layer 312 can improve the strength and rigidity of the first composite layer 312, further enhancing the strength and rigidity of the protective plate 30 and improving the protective effect of the protective plate 30. The first composite layer 312 can also absorb and cushion impact energy, reducing the impact on the battery cells 200 during an impact.

[0155] In some examples, the first composite layer 312 is a fiber-resin composite material layer, and the fibers in the first composite layer 312 may be glass fibers, carbon fibers, basalt fibers, or ultra-high molecular weight polyethylene fibers, and the resin in the first composite layer 312 may be high-toughness polyurethane or polyurea resin.

[0156] In the above technical solution, by bonding the first composite layer 312 to the surface of the metal layer 311 on the side facing away from the battery cell 200, and by forming the first composite layer 312 as a fiber-resin composite material layer, the first composite layer 312 not only further enhances the strength and rigidity of the protective plate 30 and improves the protective effect on the battery cell 200, but also provides a certain absorption and buffering effect on impact energy, thereby reducing the impact of the protective plate 30 of the battery device 1000 on the battery cell 200 when subjected to an impact.

[0157] In some embodiments of the present application, Figure 13As shown, the first protective layer 31 includes a second composite layer 313 . The second composite layer 313 is bonded to a surface of the metal layer 311 facing the battery cell 200 in the first direction Z. The second composite layer 313 is a fiber-resin composite material layer.

[0158] That is, the first protective layer 31 includes a metal layer 311, a first composite layer 312, and a second composite layer 313, and the first composite layer 312 and the second composite layer 313 are respectively arranged on both side surfaces of the metal layer 311 in the first direction, and the first composite layer 312 and the second composite layer 313 are both fiber-resin composite material layers.

[0159] The second composite material layer 313 is configured as a fiber resin composite material layer, which can improve the strength and rigidity of the first protective layer 31 , further enhance the strength and rigidity of the guard plate 30 , and improve the protective effect on the battery cell 200 .

[0160] In some examples, the fibers in the second composite layer 313 may be glass fibers, carbon fibers, basalt fibers, or ultra-high molecular weight polyethylene fibers, and the resin in the second composite layer 313 may be high-toughness polyurethane or polyurea resin.

[0161] In this embodiment, since the first composite layer 312 and the second composite layer 313 are respectively provided on both side surfaces of the metal layer 311 in the first direction, the first composite layer 312 and the second composite layer 313 cooperate with each other, which can not only jointly suppress the deformation of the middle metal layer 311 and improve the overall rigidity of the guard plate 30, but also wrap the metal layer 311 inside to protect the metal layer 311 and improve the corrosion resistance of the first protective layer 31.

[0162] In the above technical solution, by providing a second composite layer 313 on the side of the metal layer 311 facing away from the first composite layer 312, and the second composite layer 313 is a fiber-resin composite material layer, not only can the strength and rigidity of the protective plate 30 be further improved, thereby improving the protective effect of the battery cell 200, but the second composite layer 313 can also cooperate with the first composite layer 312 to wrap the metal layer 311, thereby improving the corrosion resistance of the first protective layer 31.

[0163] In some embodiments of the present application, the first protective layer 31 includes a first composite material layer 312 , and the first composite material layer 312 is a fiber-resin composite material layer.

[0164] In the above technical solution, the first protective layer 31 includes a first composite layer 312, and the first composite layer 312 is a fiber-resin composite material layer, which can ensure the strength and rigidity of the first protective layer 31 and improve the protection effect of the battery cell 200. The first composite layer 312 can also absorb and buffer the impact energy to a certain extent, thereby reducing the impact of the protective plate 30 of the battery device 1000 on the battery cell 200 when it is subjected to an impact.

[0165] In some embodiments of the present application, the elongation at break of the resin layer 32 is greater than or equal to 50%.

[0166] The elongation at break of the resin layer 32 is greater than or equal to 50%, that is, when the resin layer 32 is stretched to break, the elongated length can reach or exceed 50% of the original length.

[0167] For example, the elongation at break of the resin layer 32 may be 50%, 60%, 70%, 80%, 90%, 100%, 120%, 140%, 160%, 180%, 200%, 220%, 240%, 250%, 300% or 400%, etc.

[0168] It should be noted that when the elongation at break of the resin layer 32 is too small, for example, when the elongation at break of the resin layer 32 is 10%, 20%, 30% or 40%, the ability of the resin layer 32 to absorb and dissipate energy will be significantly weakened, making it difficult to play a buffering and protective role. At this time, under the impact of external forces, the first protective layer 31 will be subjected to greater destructive force, increasing the risk of damage to the protective plate 30. At the same time, in the face of deformation caused by temperature changes, load effects, etc., the resin layer 32 with too small an elongation at break cannot coordinate deformation with the first protective layer 31, and it is very easy for stress concentration to occur at the interface between the resin layer 32 and the first protective layer 31, causing cracks or even debonding. In addition, if the elongation at break of the resin layer 32 is too small, its ability to prevent crack expansion is insufficient. Once a tiny crack appears in the first protective layer 31, the crack will quickly penetrate the resin layer 32, affecting the protective performance and sealing performance of the protective plate 30.

[0169] In the above technical solution, by ensuring that the elongation at break of the resin layer 32 is greater than or equal to 50%, the resin layer 32 has sufficient toughness to fully deform when the protective plate 30 is subjected to external forces. As a result, the resin layer 32 not only effectively absorbs energy, reducing energy transfer to the first protective layer 31 and the battery cells 200, thereby improving the impact resistance and cushioning performance of the protective plate 30, but also coordinates the deformation of the resin layer 32 with the first protective layer 31, reducing the risk of cracks or debonding at the interface due to excessive deformation differences between the resin layer 32 and the first protective layer 31, thereby enhancing the stability and durability of the protective plate 30. Furthermore, when cracks appear in the first protective layer 31, the resin layer 32 maintains sufficient toughness, reducing the risk of cracks and improving the sealing performance of the protective plate 30.

[0170] In some embodiments of the present application, the elongation at break of the resin layer 32 is greater than or equal to 100% and less than or equal to 200%.

[0171] For example, the elongation at break of the resin layer 32 may be 100%, 110%, 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190%, or 200%.

[0172] It should be noted that when the elongation at break of the resin layer 32 is too high, for example, greater than 200%, the resin layer 32 may deform excessively when the guard plate 30 is subjected to force, resulting in significant relative displacement between the resin layer 32 and the first protective layer 31, disrupting the bond or connection between the two and further weakening the overall stability of the guard plate 30. Furthermore, excessive deformation of the resin layer 32 prevents it from efficiently transferring loads, leading to premature deformation and failure when the guard plate 30 is subjected to impact, severely reducing the protective capability of the guard plate 30.

[0173] In the above technical solution, by making the elongation at break of the resin layer 32 greater than or equal to 100% and less than or equal to 200%, when the guard plate 30 is subjected to external force, the resin layer 32 can be deformed moderately, which can not only effectively absorb and disperse energy, but also reasonably transfer the load to the first protective layer 31, so that the resin layer 32 and the first protective layer 31 can work together to improve the overall bearing capacity and anti-destruction ability of the guard plate 30, and enhance the stability and durability of the guard plate 30.

[0174] In some embodiments of the present application, reference is made to Figure 4 The first protective layer 31 and the resin layer 32 are connected as a whole through injection molding.

[0175] That is, the resin layer 32 is formed by a resin molding process, and the resin layer 32 is connected to the first protective layer 31 as a whole during the injection molding process.

[0176] In some examples, when processing and manufacturing the guard plate 30, the first protective layer 31 is first preformed; the preform of the first protective layer 31 is placed in a mold, and a cavity suitable for molding the resin layer 32 is defined between the first protective layer 31 and the inner cavity wall of the mold, and liquid resin is injected into the cavity. After the injection molding is completed, the resin is solidified in the mold to form the resin layer 32.

[0177] Furthermore, the cavity may be vacuumed before injecting the resin into it. The resin can be injected using either normal pressure injection or high pressure injection. For example, when injecting the resin using normal pressure, the injection pressure may be 10-30 bar, while when injecting the resin using high pressure, the injection pressure may be 80-120 bar.

[0178] When the resin layer 32 is injection molded, the temperature of the injection mold may be 70° C. to 130° C. The time for the resin to be cured in the mold may be 2 min to 5 min.

[0179] In other examples, the resin layer 32 may also be injection molded separately and then fixedly connected to the first protective layer 31 . For example, the injection-molded resin layer 32 may be adhesively connected to the first protective layer 31 .

[0180] In the above technical solution, by injection molding the resin layer 32 and the first protective layer 31 into one piece, the connection strength between the resin layer 32 and the first protective layer 31 can be improved, the number of parts of the guard plate 30 can be reduced, the assembly steps can be reduced, and the assembly efficiency can be improved.

[0181] In some embodiments of the present application, Figure 3-Figure 8 As shown, the resin layer 32 is formed with at least one process support hole 321 , and the process support hole 321 penetrates the resin layer 32 along the thickness direction of the resin layer 32 .

[0182] For example, the number of the process support holes 321 on the resin layer 32 may be one, two, three, five, eight, ten or more. The plurality of process support holes 321 may be spaced apart and distributed in a horizontal plane.

[0183] During the process of injection molding the resin layer 32 and the first protective layer 31 into one piece, in order to separate the first protective layer 31 from the inner wall of the mold to form a cavity suitable for filling with resin, a support structure for supporting the first protective layer 31 or a preform of the first protective layer 31 needs to be provided within the inner cavity of the mold. This support structure can be a support column, a support block, a support rib, etc. Because the support structure occupies the filling space for the resin, after the resin layer 32 is injection molded and the guard plate 30 is removed from the mold, process support holes 321 will be formed in the resin layer 32 at the location where the support structure supports the first protective layer 31.

[0184] In the above technical solution, a process support hole 321 is formed on the resin layer 32, which can facilitate the integral injection molding of the resin layer 32 and the first protective layer 31, and support the first protective layer 31 at the position of the process support hole 321, thereby facilitating the injection molding of the resin layer 32.

[0185] In some embodiments of the present application, Figure 3 and Figure 6 As shown, there are multiple process support holes 321 , and the multiple process support holes 321 are arranged in an array; and / or the cross section of the process support hole 321 is circular, elliptical or polygonal.

[0186] For example Figure 3-Figure 5 As shown, the plurality of process support holes 321 may be arranged in multiple rows and / or columns along the length direction and / or width direction of the resin layer 32. Specifically, as shown in FIG. Figure 3 As shown, the plurality of process support holes 321 may be arranged in five columns along the length direction of the resin layer 32 and in three rows along the width direction of the resin layer 32. Figure 6 As shown, the plurality of process support holes 321 may extend along the length direction of the resin layer 32 and be spaced apart in the width direction of the resin layer 32 .

[0187] In some examples, such as Figure 3 and Figure 6 As shown, the process support hole 321 may be a circular hole or a rectangular hole, etc. In other examples, the process support hole 321 may also be an elliptical hole, an oblong hole, a cross-shaped hole, or other special-shaped holes.

[0188] In the above technical solution, by setting multiple process support holes 321, the support stability of the first protective layer 31 can be improved when the resin layer 32 is injection molded, the probability of the first protective layer 31 being deflected can be reduced, and the finished product quality of the resin layer 32 can be improved.

[0189] In some embodiments of the present application, Figures 9-11 As shown, a support member 33 is embedded in the resin layer 32 , and the support member 33 is connected to the first protective layer 31 .

[0190] The elongation at break of the support member 33 is greater than that of the first protective layer 31 , thereby improving the elasticity and toughness of the support member 33 . Furthermore, the elongation at break of the support member 33 is consistent with that of the resin layer 32 .

[0191] In some examples, during the molding process of the guard plate 30 having the support member 33, the first protective layer 31 can be first connected and combined with the support member 33 to form a preform, and then the preform is placed in the mold. For the preform placed in the mold, the first protective layer 31 is supported on the bottom wall of the mold cavity by the support member 33. When the resin is injected, the resin is filled in the injection cavity defined by the first protective layer 31, the support member 33 and the inner wall surface of the mold cavity. After the resin is cured and molded, a resin layer 32 is formed.

[0192] Among them, the support part 33 plays the role of supporting the first protective layer 31 after the first protective layer 31 is put into the mold, and cooperates with the first protective layer 31 and the inner wall surface of the mold cavity to define the injection cavity of the resin layer 32. In addition, after the resin layer 32 is injection molded, the support part 33 is embedded in the resin layer 32, which can serve as the skeleton structure of the resin layer 32 to enhance the integrity of the resin layer 32.

[0193] In some examples, the support member 33 extends into a long strip shape in a plane perpendicular to the first direction Z. For example, the support member 33 may extend into a long strip shape along the length and / or width direction of the protective plate 30. The support member 33 may also extend to form an angle with the length and width directions of the protective plate 30. By extending the support member 33 into a long strip shape, on the one hand, it is possible to facilitate support for the first protective layer 31 and improve the stability of the support for the first protective layer 31. On the other hand, it is possible to reduce the space occupied by the support member 33, ensuring sufficient space for the resin to be filled. In addition, the long strip shape of the support member 33 can reduce the impact on the toughness and other properties of the resin layer 32.

[0194] In the above technical solution, by arranging the support member 33 in the resin layer 32 , the support member 33 can not only support the first protective layer 31 when the resin layer 32 is injection molded, but also serve as the skeleton structure of the resin layer 32 to enhance the overall performance of the resin layer 32 .

[0195] In some embodiments of the present application, Figures 9-11 As shown, there are multiple support members 33, and the multiple support members 33 are cross-connected to form a network.

[0196] For example, the number of support members 33 can be two, three, four, five, eight, ten, fifteen, twenty, thirty or more. In some examples, the plurality of support members 33 can be cross-connected to form a square mesh shape, a diamond mesh shape, a circular mesh shape, a hexagonal mesh shape, etc.

[0197] In the above technical solution, by cross-connecting multiple support members 33 into a mesh shape, the integrity of the multiple support members 33 can be further enhanced, the support stability of the first protective layer 31 can be further improved, and the toughness and overall stability of the resin layer 32 can be further improved.

[0198] In some embodiments of the present application, as shown in Figures 9-11 The number of support pieces 33 is multiple, and the multiple support pieces 33 extend along the second direction X and / or the third direction Y, and the second direction X and the third direction Y are perpendicular to each other.

[0199] In the above technical solution, the multiple support pieces 33 extend along the second direction X and / or the third direction Y, which can make the multiple support pieces 33 form a mesh structure with a square mesh after being connected in cross, thereby making the structure of the multiple support pieces 33 regular, facilitating molding, improving processing efficiency, and improving the uniformity of the distribution of the multiple support pieces 33 in the resin layer 32.

[0200] In some embodiments of the present application, the breaking elongation of the support piece 33 is greater than or equal to 50%.

[0201] For example, the breaking elongation of the support piece 33 can be 50%, 60%, 70%, 80%, 90%, 100%, 120%, 140%, 160%, 180%, 200%, 220%, 240%, 250%, 300%, or 400%, etc. In some examples, the breaking elongation of the support piece 33 can be greater than or equal to 100% and less than or equal to 200%. For example, the breaking elongation of the support piece 33 can be 100%, 110%, 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190%, or 200%, etc.

[0202] In some examples, the thickness of the support piece 33 in the first direction Z is equal to the thickness of the resin layer 32, for example, when the first direction Z is the up-down direction, the upper surface of the support piece 33 is flush with the upper surface of the resin layer 32, and the lower surface of the support piece 33 is flush with the lower surface of the resin layer 32.

[0203] In the above technical solution, the breaking elongation of the support piece 33 is greater than or equal to 50%, and when the protective plate 30 is subjected to an external force, the support piece 33 can also be deformed sufficiently, effectively absorbing energy, reducing the transmission of energy to the first protective layer 31 and the battery monomer 200, and improving the impact resistance and buffering performance of the protective plate 30. At the same time, the breaking elongation of the support piece 33 can be consistent or tend to be consistent with the breaking elongation of the resin layer 32, thereby making the combined structure of the support piece 33 and the resin layer 32 have good toughness, jointly absorbing energy, and further improving the impact resistance and buffering performance of the protective plate 30.

[0204] In some embodiments of the present application, as shown in Figures 9-11 The support piece 33 is a nylon thread, a polyester thread, or a polyurethane elastic thread.

[0205] In the above technical solution, the support member 33 is made of nylon thread, polyester thread, or polyurethane elastic thread, which can provide the support member 33 with good toughness and a relatively high elongation at break. This also facilitates support for the first protective layer 31 and facilitates injection molding of the resin layer 32. Furthermore, the cost of the support member 33 can be reduced.

[0206] In some embodiments of the present application, reference is made to Figure 13 The first composite material layer 312 is, and / or the second composite material layer 313 is a fiber-resin composite material layer, and the elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 50%.

[0207] For example, the elongation at break of the resin in the fiber resin composite layer may be 50%, 60%, 70%, 80%, 90%, 100%, 120%, 140%, 160%, 180%, 200%, 220%, 240%, 250%, 300% or 400%, etc.

[0208] In the above technical solution, the elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 50%, which not only enables the first composite layer 312 and / or the second composite layer 313 to effectively absorb external force impact and improve the anti-destruction ability of the protective plate 30, but also improves the overall strength and rigidity of the protective plate 30, extends the service life of the protective plate 30, and improves the protective effect on the bottom of the box 100.

[0209] In some embodiments of the present application, the elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 100% and less than or equal to 200%.

[0210] For example, the elongation at break of the resin in the fiber-resin composite material layer may be 100%, 110%, 120%, 130%, 140%, 150%, 160%, 170%, 180%, 190% or 200%, etc.

[0211] In the above technical solution, the elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 100% and less than or equal to 200%, which can enable the first composite layer 312 and / or the second composite layer 313 to deform moderately when subjected to force, effectively absorb and disperse energy, and reasonably transfer the load to the first protective layer 31, thereby improving the impact resistance of the protective plate 30 and enhancing the stability and durability of the protective plate 30.

[0212] In some embodiments of the present application, reference is made to Figure 13 The thickness of the first composite layer 312 is greater than or equal to 0.4 mm and less than or equal to 1.5 mm; and / or the tensile strength of the first composite layer 312 is greater than or equal to 200 MPa; and / or the tensile modulus of the first composite layer 312 is greater than or equal to 10 GPa.

[0213] In some examples, the thickness of the first composite layer 312 is greater than or equal to 0.4 mm and less than or equal to 1.5 mm. For example, the thickness of the first composite layer 312 may be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, or 1.5 mm.

[0214] It should be noted that when the thickness of the first composite layer 312 is too small, for example, when the thickness of the first composite layer 312 is less than 0.4 mm, when the protective plate 30 is impacted by external forces, the first composite layer 312 cannot effectively absorb and dissipate energy. When cracks appear in the metal layer 311, the first composite layer 312 cannot effectively prevent the cracks from propagating, and thus cannot improve the impact resistance and fatigue resistance of the protective plate 30. When the thickness of the first composite layer 312 is too large, for example, when the thickness of the first composite layer 312 is greater than 1.6 mm, not only will the stiffness of the protective plate 30 be reduced, but the weight and cost of the first composite layer 312 will also increase, affecting the energy density of the battery device 1000.

[0215] Therefore, in this embodiment, by setting the thickness of the first composite layer 312 to be greater than or equal to 0.4 mm and less than or equal to 1.5 mm, the first composite layer 312 can effectively absorb and dissipate energy when the guard plate 30 is impacted by external forces, thereby improving the impact resistance of the guard plate 30. Furthermore, the first composite layer 312 of appropriate thickness can prevent cracks from propagating in the metal layer 311, thereby enhancing the fatigue resistance of the guard plate 30 and extending the service life of the guard plate 30.

[0216] In addition, the thickness of the first composite layer 312 is greater than or equal to 0.4 mm and less than or equal to 1.5 mm, which can improve the overall flexibility of the guard plate 30 structure, so that the guard plate 30 can still maintain good stability and integrity when subjected to dynamic loads or deformation, thereby improving the reliability of the guard plate 30.

[0217] In some examples, the tensile strength of the first composite layer 312 is greater than or equal to 200 MPa. For example, the tensile strength of the first composite layer 312 may be 200 MPa, 220 MPa, 240 MPa, 260 MPa, 280 MPa, 300 MPa, 320 MPa, 340 MPa, 360 MPa, or 400 MPa.

[0218] In this embodiment, by ensuring that the tensile strength of the first composite layer 312 is greater than or equal to 200 MPa, the first composite layer 312 is not easily broken when subjected to external force, thereby ensuring that the first composite layer 312 can effectively play a connecting and buffering role to protect the metal layer 311. The first composite layer 312 can also be improved in its ability to absorb and dissipate energy, thereby increasing the impact resistance and durability of the guard plate 30, reducing the probability of fatigue failure of the guard plate 30, and increasing the service life of the guard plate 30.

[0219] The first composite layer 312 has a tensile modulus of greater than or equal to 10 GPa. The tensile modulus refers to the ratio of stress to strain during the elastic deformation phase of a tensile test. For example, the tensile modulus of the first composite layer 312 can be 10 GPa, 11 GPa, 12 GPa, 13 GPa, 14 GPa, 15 GPa, 16 GPa, 17 GPa, 18 GPa, 19 GPa, or 20 GPa or greater.

[0220] In this embodiment, by ensuring that the tensile modulus of the first composite layer 312 is greater than or equal to 10 GPa, the first composite layer 312 not only maintains good shape stability and reduces deformation when subjected to tensile forces, but also absorbs impact energy through significant elastic deformation and effectively recovers to its original shape after unloading, effectively protecting other parts of the guard plate 30 (such as the metal layer 311) from damage. Furthermore, the load is more evenly distributed throughout the guard plate 30, reducing local stress concentration and extending the service life of the guard plate 30 under cyclic loading.

[0221] In the above technical solution, by setting the thickness of the first composite layer 312 to be greater than or equal to 0.4 mm and less than or equal to 1.5 mm, the tensile strength to be greater than or equal to 200 MPa, and the tensile modulus to be greater than or equal to 10 GPa, not only can the first composite layer 312 effectively absorb and dissipate energy, thereby improving the impact resistance of the guard plate 30, but also the fatigue resistance of the guard plate 30 can be enhanced, so that the guard plate 30 maintains good stability and integrity, thereby extending the service life of the guard plate 30.

[0222] In some embodiments of the present application, Figure 13 As shown, the thickness of the second composite layer 313 is greater than or equal to 0.2 mm and less than or equal to 1 mm; and / or the tensile strength of the second composite layer 313 is greater than or equal to 200 MPa; and / or the tensile modulus of the second composite layer 313 is greater than or equal to 10 GPa.

[0223] In some examples, the thickness of the second composite layer 313 is greater than or equal to 0.2 mm and less than or equal to 1 mm. For example, the thickness of the second composite layer 313 may be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0224] In this embodiment, the thickness of the second composite layer 313 is greater than or equal to 0.2 mm and less than or equal to 1 mm. When the protective plate 30 is impacted by external force, the second composite layer 313 can not only effectively absorb and dissipate energy, thereby improving the impact resistance of the protective plate 30, but also prevent cracks from expanding in the metal layer 311, thereby enhancing the fatigue resistance of the protective plate 30 and extending the service life of the protective plate 30. It can also improve the overall flexibility of the structure of the protective plate 30, so that the protective plate 30 can still maintain good stability and integrity when subjected to dynamic loads or deformation, thereby improving the reliability of the protective plate 30, reducing the probability of penetrating perforations in the protective plate 30 when subjected to external force, improving the sealing performance of the protective plate 30, and reducing the thickness and material usage of the second composite layer 313, thereby reducing costs and improving the energy density of the battery device 1000.

[0225] In some examples, the tensile strength of the second composite layer 313 is greater than or equal to 200 MPa. For example, the tensile strength of the second composite layer 313 may be 200 MPa, 220 MPa, 240 MPa, 260 MPa, 280 MPa, 300 MPa, 320 MPa, 340 MPa, 360 MPa, or 400 MPa.

[0226] In this embodiment, by ensuring that the tensile strength of the second composite layer 313 is greater than or equal to 200 MPa, the second composite layer 313 is not easily broken when subjected to external force, thereby ensuring that the second composite layer 313 can effectively play a connecting and buffering role to protect the metal layer 311. The second composite layer 313 can also be improved in its ability to absorb and dissipate energy, thereby increasing the impact resistance and durability of the guard plate 30, reducing the probability of fatigue failure of the guard plate 30, and increasing the service life of the guard plate 30.

[0227] The tensile modulus of the second composite layer 313 is greater than or equal to 10 GPa. For example, the tensile modulus of the second composite layer 313 may be 10 GPa, 11 GPa, 12 GPa, 13 GPa, 14 GPa, 15 GPa, 16 GPa, 17 GPa, 18 GPa, 19 GPa, or 20 GPa or above.

[0228] In this embodiment, by ensuring that the tensile modulus of the second composite layer 313 is greater than or equal to 10 GPa, the second composite layer 313 can not only maintain good shape stability and reduce deformation when subjected to tensile force, but also absorb impact energy through the large elastic deformation of the second composite layer 313 and effectively restore its original shape after unloading, thereby effectively protecting other parts of the guard plate 30 (such as the metal layer 311) from damage. The second composite layer 313 can also more evenly distribute the load throughout the guard plate 30, reducing local stress concentration and extending the service life of the guard plate 30 under cyclic loads.

[0229] In the above technical solution, by setting the thickness of the second composite layer 313 to be greater than or equal to 0.2 mm and less than or equal to 1 mm, the tensile strength to be greater than or equal to 200 MPa, and the tensile modulus to be greater than or equal to 10 GPa, not only can the second composite layer 313 effectively absorb and dissipate energy, thereby improving the impact resistance of the protective plate 30, but also can enhance the fatigue resistance of the protective plate 30, so that the protective plate 30 maintains good stability and integrity, and extends the service life of the protective plate 30, but also can reduce the probability of penetrating perforation of the protective plate 30 when subjected to external force, improve the sealing performance of the protective plate 30, reduce the thickness of the second composite layer 313 and the amount of material used, reduce costs, and improve the energy density of the battery device 1000.

[0230] In some embodiments of the present application, the thickness of the first composite layer 312 is greater than or equal to the thickness of the second composite layer 313. The greater thickness of the first composite layer 312 allows the first composite layer 312 to have sufficient thickness to improve the impact resistance and scratch resistance of the protective plate 30 on the side facing away from the battery cell 200. The smaller thickness of the second composite layer 313 allows the thickness of the second composite layer 313 to be reduced, thereby reducing material usage, achieving a lighter protective plate 30, and improving the energy density of the battery device 1000.

[0231] In some embodiments of the present application, Figure 10 and Figure 14 As shown, the guard plate 30 includes a guard plate body 301 and a flange portion 302. The flange portion 302 is connected to the periphery of the guard plate body 301 and extends in a ring shape along the circumference of the guard plate body 301. The flange portion 302 is located on the side of the guard plate body 301 facing the battery cell 200 in the first direction Z.

[0232] In some examples, the flange portion 302 is formed with a plurality of first through-holes extending vertically therethrough. These first through-holes are spaced apart circumferentially around the flange portion 302. Fasteners pass through the first through-holes to secure the protective plate 30 to the housing 100. In the first direction Z, the end surface of the fastener facing away from the battery cell 200 does not extend beyond the side surface of the protective plate body 301 facing away from the battery cell 200. As a result, the fasteners do not occupy additional space beyond the lower side surface of the protective plate body 301 facing away from the battery cell 200, making the battery device 1000 more compact and reasonable.

[0233] In the above technical solution, the guard plate 30 includes a guard plate body 301 and a flange portion 302. This not only improves the rigidity of the guard plate 30 but also facilitates the fixed connection between the guard plate 30 and the housing 100, simplifies the connection structure, and facilitates assembly. Furthermore, the fasteners connecting the housing 100 and the guard plate 30 do not occupy additional space beyond the lower surface of the guard plate body 301, resulting in a more compact and reasonable structure.

[0234] In some embodiments of the present application, Figure 14 As shown, the guard plate 30 further includes: a reinforcement frame 34 , which extends in a ring shape along the circumference of the guard plate 30 , and the reinforcement frame 34 and the flange portion 302 are stacked in the first direction Z, or the reinforcement frame 34 is embedded in the flange portion 302 .

[0235] In some examples, along the first direction Z, the reinforcement frame 34 may be disposed on a side of the flange portion 302 facing the battery cell 200 , or the reinforcement frame 34 may be disposed on a side of the flange portion 302 facing the battery cell 200 .

[0236] In some examples, the projection of the reinforcement frame 34 completely overlaps with the projection of the flange portion 302 in a projection plane perpendicular to the first direction Z. Furthermore, the reinforcement frame 34 is formed with a plurality of second through holes extending vertically through the reinforcement frame 34 . The plurality of second through holes are spaced apart along the circumference of the flange portion 302 . The plurality of first through holes correspond to the plurality of second through holes in a one-to-one manner and face each other vertically. Fasteners pass through the first through holes and the second through holes in sequence to secure the guard plate 30 to the box body 100 .

[0237] In some examples, the material of the reinforcement frame 34 may be the same as the material of the first composite material layer 312 and the second composite material layer 313 . For example, the reinforcement frame 34 may be a fiber-resin composite material.

[0238] In the above technical solution, by providing a reinforcement frame 34, not only can the local strength of the flange portion 302 be improved, the connection rigidity between the guard plate 30 and the box body 100 be improved, and the connection reliability and stability between the guard plate 30 and the box body 100 be improved, but it can also ensure that during the locking process, the flange portion 302 can effectively compress the sealing gasket located between the guard plate 30 and the box body 100, thereby improving the sealing performance between the guard plate 30 and the box body 100 and improving the sealing performance of the battery device 1000.

[0239] In some embodiments of the present application, reference is made to Figure 3 The thickness of the flange portion 302 is greater than the thickness of the guard plate body 301, or a reinforcement structure is provided on the flange portion 302.

[0240] In the above technical solution, by making the thickness of the flange portion 302 greater than the thickness of the guard plate body 301 or providing a reinforcing structure on the flange portion 302, the strength and rigidity of the flange portion 302 can be enhanced, the connection rigidity between the guard plate 30 and the box body 100 can be improved, and the connection reliability and stability between the guard plate 30 and the box body 100 can be improved. It can also ensure that during the locking process, the flange portion 302 of the guard plate 30 can effectively compress the sealing gasket located between the guard plate 30 and the box body 100, thereby improving the sealing performance between the guard plate 30 and the box body 100.

[0241] In some embodiments of the present application, reference is made to Figure 2 The battery device 1000 includes a box body 100, a battery cell 200 is arranged in the box body 100, the box body 100 includes a bottom plate arranged on one side of the battery cell 200 in the first direction Z, and the protective plate 30 is formed as the bottom plate, or the protective plate 30 is arranged on the side of the bottom plate away from the battery cell 200.

[0242] In some examples, such as Figure 2 As shown, the battery device 1000 includes a box body 100, which includes a box body and a box cover. The box body is roughly in the shape of a rectangular box with an open top. The box body includes a frame beam and a bottom plate. The frame beam includes two first side beams and two second side beams. The two first side beams extend along the second direction X and are arranged at intervals in the third direction Y. The two second side beams extend along the third direction Y and are arranged at intervals in the second direction X. The two ends of the two first side beams are respectively connected to the two ends of the two second side beams to enclose a rectangular frame structure with both sides open in the first direction Z. The bottom plate is sealed on the bottom of the frame beam, and the box cover is sealed on the top of the frame beam. The bottom plate and the frame beam can be connected by welding or by fasteners, and the box cover and the frame beam can be connected by welding, by fasteners, or by structural adhesive.

[0243] In some examples, reference Figure 2 A partition beam is provided in the box body 100, which divides the space in the box body 100 into an installation cavity and an electrical cavity arranged at intervals in the second direction X. Multiple battery cells 200 are stacked in the installation cavity along the second direction X and the third direction Y, and electrical components such as a high-voltage distribution box are arranged in the electrical cavity.

[0244] In some examples, the battery device 1000 further includes a heat exchanger disposed between the battery cells 200 and the bottom plate, between the battery cells 200 and the cover, and / or between adjacent battery cells 200 for performing heat exchange with the battery cells 200 .

[0245] In some examples, reference Figure 2 The protective plate 30 is disposed on a side of the box body 100 that faces away from the accommodating cavity 101 in the first direction Z. The protective plate 30 and the box body 100 may be fixedly connected or removably connected. For example, the protective plate 30 and the box body 100 may be welded, fastened, adhesively bonded, snap-fitted, or riveted. The protective plate 30 is disposed on the bottom of the box body 100 to protect the bottom of the box body 100, ensuring that the battery device 1000 does not directly impact the bottom plate during a bottom-on ball strike, thereby improving the reliability of the battery device 1000.

[0246] In the above technical solution, by forming the protective plate 30 as the bottom plate of the box body 100, or arranging the protective plate 30 on the side of the bottom plate of the box body 100 away from the battery cell 200, when the bottom of the battery device 1000 is hit by a bottom ball, the protective plate 30 can effectively protect the bottom of the battery device 1000 and improve the impact resistance of the battery device 1000.

[0247] In a second aspect, an embodiment of the present application further provides an electrical device 1 comprising the battery device 1000 according to any one of the above embodiments.

[0248] In the above technical solution, since the electrical device 1 is provided with the above-mentioned battery device 1000, and since the protective plate 30 of the battery device 1000 includes a first protective layer 31 and a resin layer 32 bonded to the surface of the first protective layer 31 facing away from the battery cell 200, the thickness of the resin layer 32 is 0.3mm-3mm, and the elongation at break of the resin layer 32 is greater than the elongation at break of the first protective layer 31. During the process of being hit by the bottom ball, the resin layer 32 deforms, which can absorb the impact energy and reduce the destructive effect of the impact on the first protective layer 31. When the protective plate 30 is subjected to a large external force, it can maintain a stable shape and reduce the risk of overall structural failure due to local damage, thereby improving the load-bearing capacity and anti-destruction ability of the protective plate 30, improving the scratch resistance and impact resistance of the protective plate 30, and improving the protective ability of the protective plate 30, thereby improving the overall performance of the electrical device 1.

[0249] In a third aspect, an embodiment of the present application further provides an energy storage device, comprising the battery device 1000 of any one of the above embodiments.

[0250] In the above technical solution, since the energy storage device is provided with the above-mentioned battery device 1000, and since the protective plate 30 of the battery device 1000 includes a first protective layer 31 and a resin layer 32 bonded to the surface of the first protective layer 31 facing away from the battery cell 200, the thickness of the resin layer 32 is 0.3mm-3mm, and the elongation at break of the resin layer 32 is greater than the elongation at break of the first protective layer 31. In the process of being hit by a bottom ball, the resin layer 32 deforms, which can absorb the impact energy and reduce the destructive effect of the impact on the first protective layer 31. When the protective plate 30 is subjected to a large external force, it can maintain a stable shape and reduce the risk of overall structural failure due to local damage, thereby improving the load-bearing capacity and anti-destruction ability of the protective plate 30, improving the scratch resistance and impact resistance of the protective plate 30, and improving the protective ability of the protective plate 30, thereby improving the overall performance of the energy storage device.

[0251] The present application also provides a protective plate 30, which is the protective plate 30 of the battery device 1000 in any of the above-described embodiments. Specifically, the protective plate 30 includes a first protective layer 31 and a resin layer 32 stacked along a first direction Z. Along the first direction Z, the resin layer 32 is bonded to a side of the first protective layer 31 facing away from the battery cell 200. The resin layer 32 has a thickness of greater than or equal to 0.3 mm to 3 mm, and has a greater elongation at break than the first protective layer 31. The first direction Z is the direction of gravity.

[0252] In the above technical solution, since the protective plate 30 includes a first protective layer 31 and a resin layer 32 combined with the surface of the first protective layer 31 facing away from the box body 100, along the first direction, the thickness of at least part of the resin layer 32 is 0.4 mm. During the process of being hit by the bottom ball, the resin layer 32 deforms, which can absorb the impact energy and reduce the destructive effect of the impact on the first protective layer 31. When the protective plate 30 is subjected to a large external force, it can maintain a stable shape and reduce the risk of overall structural failure due to local damage, thereby improving the load-bearing capacity and anti-destruction ability of the protective plate 30, improving the scratch resistance and impact resistance of the protective plate 30, and enhancing the protective ability of the protective plate 30.

[0253] The following will refer to Figure 2-Figure 14 The battery device 1000 according to five specific embodiments of the present application is described.

[0254] Example 1, refer to Figure 2-Figure 5 The battery device 1000 includes a box body 100 , a plurality of battery cells 200 and a protective plate 30 . The plurality of battery cells 200 are arranged in the box body 100 , and the protective plate 30 is provided on the outer side of the bottom of the box body 100 .

[0255] Specifically, if Figure 3 and Figure 4 As shown, the protective plate 30 includes a first protective layer 31 and a resin layer 32, wherein the first protective layer 31 includes a metal layer 311 and a second composite layer 313, and the resin layer 32, the metal layer 311 and the second composite layer 313 are stacked in sequence from bottom to top.

[0256] like Figure 4 As shown, the metal layer 311 is a metal plate. The metal layer 311 can be made of steel or other high-modulus metal materials, and the thickness of the metal layer 311 is 0.2mm-1.5mm. Depending on the arrangement of the multiple battery cells 200 within the housing 100, the metal layer 311 can be reduced in size and arranged within the projection area of ​​the multiple battery cells 200, thereby further reducing the weight of the guard plate 30 and improving the vehicle's endurance.

[0257] like Figure 4As shown, resin layer 32 is a pure resin layer with a thickness of 0.5 mm to 2 mm, and an elongation at break of resin layer 32 is greater than or equal to 50%. Second composite layer 313 is a fiber-resin composite material layer with a thickness of 0.2 mm to 1 mm, a tensile strength of ≥ 200 MPa, and a tensile modulus of ≥ 10 GPa. The fibers in second composite layer 313 are glass fibers, carbon fibers, basalt fibers, or ultra-high molecular weight polyethylene fibers, and the resin in second composite layer 313 is a high-toughness polyurethane or polyurea resin with an elongation at break of ≥ 50%.

[0258] The guard plate 30 of this embodiment is formed by a resin transfer molding process. The specific molding process of the guard plate 30 of this embodiment 1 is described below.

[0259] First, the fibers required for the second composite layer 313 and the intermediate metal layer 311 are preformed and composited into a complete preform. Then, the preform is placed in a mold, and after evacuating the mold through a vacuum line, resin is injected into the mold cavity using a resin pump. Depending on the production cycle requirements, either normal pressure injection (injection pressure 10 bar-30 bar) or high pressure injection molding (injection pressure 80 bar-120 bar) can be used. After injection molding, curing is completed inside the mold at a mold temperature of 70°C-130°C and a curing reaction time of 2 minutes to 5 minutes.

[0260] Finally, the resin on the lower side of the metal layer 311 is solidified to form the resin layer 32 , and the resin on the upper side of the metal plate is wrapped with the fibers and solidified to form the second composite layer 313 .

[0261] A plurality of support columns are provided in the mold for supporting the preform. After the resin layer 32 is cured, a plurality of process support holes 321 arranged in an array are formed on the resin layer 32 , and the process support holes 321 are circular holes.

[0262] Example 2, as Figure 6-Figure 8 As shown, the structure of this embodiment is roughly the same as that of embodiment one, wherein the same parts are marked with the same figure, and the only difference is that the process support holes 321 of the resin layer 32 in embodiment one are circular holes and are arranged in an array, while the guard plate 30 in this embodiment two is supported by support ribs extending along the length direction of the guard plate 30 during the injection molding process, and the process support holes 321 on the resin layer 32 are formed into long strips extending along the length direction of the metal layer 311, and the number of process support holes 321 is multiple, and the multiple process support holes 321 are arranged at intervals along the width direction of the metal layer 311.

[0263] Example 3, as Figures 9-11As shown, the structure of this embodiment is roughly the same as that of embodiment one, wherein the same parts are marked with the same figure, and the only difference is that: the resin layer 32 in embodiment one is formed with a process support hole 321, while the resin layer 32 of the guard plate 30 in this embodiment three does not have the process support hole 321, and the guard plate 30 includes a support member 33 embedded in the resin layer 32, wherein the support member 33 can be a nylon wire, and the elongation at break of the support member 33 is greater than or equal to 50%, and the number of the support members 33 is multiple, and the multiple support members 33 are arranged at intervals along the length and width directions of the metal layer 311, and the multiple support members 33 are cross-connected to form a support network with square meshes.

[0264] The guard plate 30 of this embodiment is formed using a resin transfer molding process. First, the support mesh, the fibers required for the second composite layer 313, and the intermediate metal layer 311 are preformed to form a complete preform. The preform is then placed in a mold, with the metal layer 311 supported on the inner bottom surface of the mold cavity by the support mesh. After vacuuming the mold through vacuum lines, resin is injected into the mold cavity using a resin pump. After injection molding, the mold is cured and formed.

[0265] Example 4, as Figure 12-13 As shown, the structure of this embodiment is substantially the same as that of the first embodiment, with identical components designated by the same reference numerals. The only difference is that in the first embodiment, the protective plate 30 is provided with only one resin layer 32, and the first protective layer 31 comprises only a metal layer 311 and a second composite layer 313. In contrast, the protective plate 30 of the fourth embodiment includes two resin layers 32, and the first protective layer 31 comprises a metal layer 311, a first composite layer 312, and a second composite layer 313. The resin layer 32, the second composite layer 313, the metal layer 311, the first composite layer 312, and the resin layer 32 are stacked in sequence from top to bottom.

[0266] The thickness of the first composite layer 312 is 0.4 mm to 1.5 mm, and the material of the first composite layer 312 is identical to that of the second composite layer 313. Furthermore, the thickness of the first composite layer 312 is greater than or equal to the thickness of the second composite layer 313. Furthermore, the thickness of the resin layer 32 arranged along the first direction Z, facing the battery cell 200, is 0.5 mm to 2 mm.

[0267] The guard plate 30 of this embodiment is formed by a resin transfer molding process. First, according to different fiber lay-up designs (fibers in the first composite layer 312 and fibers in the second composite layer 313), the fibers in the first composite layer 312 and the fibers in the second composite layer 313 and the metal steel plate in the middle are preformed to form a complete preform. The preform is placed in a mold, and after vacuuming the mold through a vacuum pipe on the mold, resin is injected into the mold cavity using a resin pump. After the injection molding is completed, curing and molding are completed inside the mold.

[0268] Among them, the fibers located on the upper side of the metal layer 311 are solidified into a whole with the resin that wraps the fibers on the upper side of the metal layer 311, and are formed into a second composite layer 313; the resin above the fibers on the upper side of the metal layer 311 is solidified into one resin layer 32; the fibers located on the lower side of the metal layer 311 are solidified into a whole with the resin that wraps the fibers on the lower side of the metal layer 311, and are formed into a first composite layer 312; the resin below the fibers on the lower side of the metal layer 311 is solidified into another resin layer 32.

[0269] The protective plate 30 of this embodiment can fully utilize the performance characteristics of different materials to enhance the protective capability of the protective plate 30: the first composite layer 312 and the second composite layer 313 can utilize their excellent tensile strength to suppress deformation of the intermediate metal plate. During a ball strike, the impact energy is fully absorbed through the interface damage of the metal layer 311, the first composite layer 312, and the second composite layer 313, the damage of the internal fiber and resin interface, and the fracture of the fibers and resin themselves. The metal layer 311 can fully resist deformation by utilizing its own high modulus characteristics, while providing good puncture resistance. The first composite layer 312 contains resin, which can utilize the high toughness and high elasticity of the resin to produce non-Newtonian fluid properties, thereby enhancing the rigidity of the protective plate 30. The resin layer 32 arranged on the upper surface of the second composite layer 313 utilizes the high toughness of the resin layer 32 to ensure that the protective plate 30 will not be punctured even if the bottom structure is damaged, thereby ensuring the sealing of the protective plate 30.

[0270] The first composite layer 312 and the second composite layer 313 can protect the internal metal layer 311 and improve the corrosion resistance of the guard plate 30 . The first composite layer 312 close to the ground can improve the scratch resistance of the guard plate 30 .

[0271] Example 5, as Figure 14As shown, the structure of this embodiment is substantially the same as that of the first embodiment, with identical components designated by the same reference numerals. The only difference is that the guard plate 30 of the first embodiment comprises only a guard plate body 301 and a flange portion 302 connected to the periphery of the guard plate body 301. In contrast, the guard plate 30 of this embodiment further comprises a reinforcement frame 34, which is stacked with the flange portion 302 and is made of a fiber-resin composite material. The guard plate 30 is securely connected to the housing 100 via the flange portion 302 and the reinforcement frame 34. This improves the rigidity of the flange surface of the guard plate 30, ensuring a seal with the housing 100.

[0272] Furthermore, the protective plate 30 includes a first protective layer 31 and two resin layers 32 , wherein the first protective layer 31 is a metal layer 311 , and the two resin layers 32 are respectively combined on the upper and lower surfaces of the metal layer 311 .

[0273] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery Cell (200); A protective plate (30) is provided on one side of the battery cell (200) along a first direction (Z), and the protective plate (30) comprises: A first protective layer (31) and a resin layer (32), wherein the resin layer (32) is bonded to a surface of the first protective layer (31) facing away from the battery cell (200), and along the first direction (Z), at least a portion of the resin layer (32) on the surface of the first protective layer (31) facing away from the battery cell (200) is 0.3 mm to 3 mm higher than the first protective layer (31), and the elongation at break of the resin layer (32) is greater than the elongation at break of the first protective layer (31), and the first direction (Z) is the direction of gravity.

2. The battery device according to claim 1, wherein: The resin layer (32) is bonded to the surface of the first protective layer (31) facing the battery cell (200), and along the first direction (Z), at least a portion of the resin layer (32) on the surface of the first protective layer (31) facing the battery cell (200) is 0.3 mm to 3 mm higher than the first protective layer (31).

3. The battery device according to any one of claims 1 to 2, characterized in that: The first protective layer (31) comprises a metal layer (311).

4. The battery device according to claim 3, characterized in that The first protective layer (31) comprises a first composite material layer (312), the first composite material layer (312) being bonded to a surface of the metal layer (311) facing away from the battery cell (200) in the first direction (Z), and the first composite material layer (312) being a fiber resin composite material layer.

5. The battery device according to claim 4, characterized in that The first protective layer (31) includes a second composite material layer (313), the second composite material layer (313) being bonded to a surface of the metal layer (311) facing the battery cell (200) in the first direction (Z), and the second composite material layer (313) being a fiber resin composite material layer.

6. The battery device according to any one of claims 1 to 2, characterized in that: The first protective layer (31) comprises a first composite material layer (312), and the first composite material layer (312) is a fiber resin composite material layer.

7. The battery device according to claim 1, wherein: Along the first direction (Z), at least a portion of the resin layer (32) on the surface of the first protective layer (31) facing away from the battery cell (200) is higher than the first protective layer (31) by a height of 0.4 mm to 2 mm.

8. The battery device according to claim 2, wherein: Along the first direction (Z), at least a portion of the resin layer (32) on the surface of the first protective layer (31) facing the battery cell (200) is 0.4 mm to 2 mm higher than the first protective layer (31).

9. The battery device according to claim 1, wherein: The elongation at break of the resin layer (32) is greater than or equal to 50%.

10. The battery device according to claim 9, characterized in that The elongation at break of the resin layer (32) is greater than or equal to 100% and less than or equal to 200%.

11. The battery device according to claim 1, wherein: The first protective layer (31) and the resin layer (32) are connected as one body through injection molding.

12. The battery device according to claim 11, wherein: The resin layer (32) is formed with at least one process support hole (321), and the process support hole (321) penetrates the resin layer (32) along the thickness direction of the resin layer (32).

13. The battery device according to claim 12, characterized in that The number of the process support holes (321) is multiple, and the multiple process support holes (321) are arranged in an array; and / or, The cross section of the process support hole (321) is circular, elliptical or polygonal.

14. The battery device according to claim 11, wherein: A support member (33) is embedded in the resin layer (32), and the support member (33) is connected to the first protective layer (31).

15. The battery device according to claim 14, characterized in that There are multiple support members (33), and the multiple support members (33) are cross-connected to form a mesh.

16. The battery device according to claim 15, characterized in that There are multiple support members (33), and the multiple support members (33) extend along the second direction and / or the third direction, and the first direction (Z), the second direction, and the third direction are perpendicular to each other.

17. The battery device according to claim 14, wherein: The elongation at break of the support member (33) is greater than or equal to 50%.

18. The battery device according to claim 17, characterized in that The support member (33) is a nylon thread, a polyester thread or a polyurethane elastic thread.

19. The battery device according to claim 3, wherein: In the first direction (Z), the thickness of the metal layer (311) is greater than or equal to 0.2 mm and less than or equal to 1.5 mm.

20. The battery device according to claim 19, wherein: There are a plurality of battery cells (200), and in a projection plane perpendicular to the first direction (Z), the projection of the metal layer (311) at least completely covers the projections of the plurality of battery cells (200).

21. The battery device according to claim 4 or 5, characterized in that: The elongation at break of the resin in the fiber-resin composite material layer is greater than or equal to 50%.

22. The battery device according to claim 21, characterized in that The elongation at break of the resin in the fiber-resin composite material layer is 100%-200%.

23. The battery device according to claim 4, characterized in that The thickness of the first composite material layer (312) is greater than or equal to 0.4 mm and less than or equal to 1.5 mm; and / or, The tensile strength of the first composite material layer (312) is greater than or equal to 200 MPa; and / or, The tensile modulus of the first composite material layer (312) is greater than or equal to 10 GPa.

24. The battery device according to claim 5, characterized in that The thickness of the second composite material layer (313) is greater than or equal to 0.2 mm and less than or equal to 1 mm; and / or, The tensile strength of the second composite material layer (313) is greater than or equal to 200 MPa; and / or, The tensile modulus of the second composite material layer (313) is greater than or equal to 10 GPa.

25. The battery device according to claim 1, wherein: The guard plate (30) comprises a guard plate body (301) and a flange portion (302), wherein the flange portion (302) is connected to the periphery of the guard plate body (301) and extends in a ring shape along the circumference of the guard plate body (301), and the flange portion (302) is located on a side of the guard plate body (301) facing the battery cell (200) in the first direction (Z).

26. The battery device according to claim 25, characterized in that The guard plate (30) further includes a reinforcement frame (34), the reinforcement frame (34) extending in a ring shape along the circumference of the guard plate (30), the reinforcement frame (34) and the flange portion (302) being stacked in the first direction (Z), or the reinforcement frame (34) being embedded in the flange portion (302).

27. The battery device according to claim 25, characterized in that In the first direction (Z), the thickness of the flange portion (302) is greater than the thickness of the guard plate body (301); or, a reinforcement structure is provided on the flange portion (302).

28. The battery device according to claim 1, wherein: The battery device (1000) comprises a box (100), the battery cell (200) is arranged in the box (100), the box (100) comprises a bottom plate arranged on one side of the battery cell (200) in the first direction (Z), and the protective plate (30) is formed as the bottom plate, or the protective plate (30) is arranged on a side of the bottom plate facing away from the battery cell (200).

29. An electrical device, characterized in that: A battery device (1000) comprising any one of claims 1-28.

30. An energy storage device, characterized in that: A battery device (1000) comprising any one of claims 1-28.

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