Battery device and electrical device

Abstract

A battery device (1100) comprises a case (10), battery cells (20), and a protective plate (100), wherein the battery cells (20) are arranged in the case (10). Along the direction of gravity, the protective plate (100) is arranged at the bottom of the battery cells (20); the protective plate (100) comprises a first fiber resin layer (110), an intermediate layer (120), and a second fiber resin layer (130) which are sequentially stacked in a first direction; the intermediate layer (120) comprises a resin frame portion (121) and a puncture-resistant plate portion (122); the puncture-resistant plate portion (122) is located in the resin frame portion (121); and the resin frame portion (121) is connected between the first fiber resin layer (110) and the second fiber resin layer (130). Provided is an electrical device using the battery device (1100).

Description

Battery devices and power-consuming devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420647264.5 filed on April 1, 2024, entitled “Protective plate, box, battery and electrical device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] How to improve the reliability of battery devices is an urgent problem to be solved in battery technology.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0008] In a first aspect, the present application provides a battery device comprising a housing, a battery cell, and a protective plate, wherein the battery cell is disposed within the housing. The protective plate is disposed at the bottom of the battery cell in the direction of gravity, and comprises a first fiber resin layer, an intermediate layer, and a second fiber resin layer stacked sequentially along a first direction. The intermediate layer comprises a resin frame portion and an anti-puncture plate portion. The anti-puncture plate portion is located within the resin frame portion, and the resin frame portion is connected between the first fiber resin layer and the second fiber resin layer.

[0009] In the technical solution of the embodiment of the present application, since the intermediate layer includes an anti-puncture plate portion and the anti-puncture plate portion is located between the first fiber resin layer and the second fiber resin layer, the risk of corrosion of the anti-puncture plate portion can be reduced. When the protective plate is subjected to external force, the anti-puncture plate portion can improve the ability of the protective plate to resist external force, thereby reducing the risk of excessive deformation of the protective plate. At the same time, the resin frame portion can further improve the strength and rigidity of the protective plate, thereby improving the ability of the protective plate to resist external force impact, and is also conducive to improving the reliability of the battery device. In the embodiment where the protective plate is connected to the box body through the resin frame portion, the provision of the resin frame portion can also improve the stability of the connection between the protective plate and the box body.

[0010] In one or more embodiments of the first aspect, the anti-puncture plate portion includes a plurality of spaced-apart sub-plate portions, and the resin frame portion includes a partition bar disposed between two adjacent sub-plate portions.

[0011] In this solution, the spacing of the multiple sub-panels optimizes stress distribution within the protective plate, reducing the risk of excessive deformation caused by a single point of stress. The separation strips serve as a reference for sub-panel assembly, improving assembly efficiency.

[0012] In one or more embodiments of the first aspect, the anti-puncture plate portion is a flat plate structure.

[0013] In the above solution, since the anti-puncture plate portion is a flat plate structure, the risk of stress concentration occurring in the anti-puncture plate portion is low and the structural stability is high.

[0014] In one or more embodiments of the first aspect, the protective plate is a flat plate structure.

[0015] In the above solution, since the protective plate is a flat plate, it can be processed through an extrusion process, which improves the production efficiency of the protective plate. Furthermore, it reduces the difficulty of assembling the housing and the protective plate. Furthermore, it also helps reduce the risk of seal failure between the housing and the protective plate.

[0016] In one or more embodiments of the first aspect, the width of the protective plate is W, and in the width direction of the protective plate, the size of the anti-puncture plate portion is w, and 0.6≤w / W<1.

[0017] In the above scheme, the size of the anti-puncture plate portion is set within a reasonable range in the width direction of the protective plate. While the protective plate has high structural strength and a large anti-puncture area, the weight of the protective plate can also be controlled within a reasonable range, thereby enabling the battery device to have a higher energy density.

[0018] In one or more embodiments of the first aspect, the length of the protective plate is L, and the dimension of the anti-puncture plate portion in the length direction of the protective plate is l, and 0.6≤l / L<1.

[0019] In the above scheme, the size of the anti-puncture plate portion is set within a reasonable range in the length direction of the protective plate. While the protective plate has a high structural strength and a large anti-puncture area, the weight of the protective plate can also be controlled within a reasonable range, thereby enabling the battery device to have a higher energy density.

[0020] In one or more embodiments of the first aspect, the plate thickness of the resin frame portion is equal to the plate thickness of the puncture-proof plate portion.

[0021] In the above solution, since the thickness of the resin frame is equal to that of the puncture-proof plate, this facilitates closer adhesion of the first and second fiber resin layers to the surface of the intermediate layer, thereby improving the connection strength between the first and second fiber resin layers and the intermediate layer. Furthermore, it reduces the risk of stress concentration between the resin frame and the puncture-proof plate.

[0022] In one or more embodiments of the first aspect, the layer thickness of the second fiber resin layer is greater than the layer thickness of the first fiber resin layer.

[0023] In the above scheme, since the thickness of the second fiber resin layer is greater than that of the first fiber resin layer, the second fiber resin layer has a higher structural strength, which can reduce the risk of excessive deformation of the protective plate and corrosion of the anti-puncture plate part due to external force acting on the protective plate through the second fiber resin layer.

[0024] In one or more embodiments of the first aspect, the first fiber resin layer has a thickness of h1, 0

[0025] In the above solution, the thickness of the first fiber resin layer is set within a reasonable range. The first fiber resin layer has a high ability to resist external impact, reducing the risk of corrosion of the anti-puncture plate, while also enabling the battery device to have a higher energy density and lower manufacturing cost.

[0026] In one or more embodiments of the first aspect, the second fiber resin layer has a thickness h2, 0<h2≤1.2 mm.

[0027] In the above solution, the thickness of the second fiber resin layer is set within a reasonable range. The second fiber resin layer has a high ability to resist external impact, reducing the risk of corrosion of the anti-puncture plate, while also enabling the battery device to have a higher energy density and lower manufacturing cost.

[0028] In one or more embodiments of the first aspect, the thickness of the anti-puncture plate is h3, where 0<h3≤1 mm.

[0029] In the above solution, the thickness of the anti-puncture plate is set within a reasonable range. While the protective plate has a high ability to resist external impact, the battery device can also have a higher energy density and lower manufacturing cost.

[0030] In one or more embodiments of the first aspect, the protective plate further includes an adhesive layer, and the first fiber resin layer and the intermediate layer are bonded together by the adhesive layer; and / or the second fiber resin layer and the intermediate layer are bonded together by the adhesive layer.

[0031] ​In the above solution, the provision of the adhesive layer can improve the connection strength between the intermediate layer and the first fiber resin layer, and reduce the risk of corrosion of the anti-puncture plate portion caused by separation of the intermediate layer and the first fiber resin layer and / or the second fiber resin layer.

[0032] In one or more embodiments of the first aspect, the adhesive layer includes a resin film layer.

[0033] In the above solution, the resin film layer is used as the adhesive layer. On the one hand, it is more tightly bonded to the fiber resin layer. On the other hand, it is beneficial to reduce the weight of the protective plate and improve the energy density of the battery device.

[0034] In one or more embodiments of the first aspect, the thickness of the adhesive layer is h4, 0<h4≤0.5 mm.

[0035] In the above solution, the thickness of the adhesive layer is set within a reasonable range, which can provide a strong connection strength between the fiber resin layer and the intermediate layer while enabling the battery device to have a higher energy density.

[0036] In one or more embodiments of the first aspect, the area corresponding to the protective plate and the anti-puncture plate portion is recessed along the first direction to form a accommodating cavity, and the bottom surface of the accommodating cavity is raised in the opposite direction of the first direction to form a sinking platform, and the sinking platform is surrounded to form a sinking hole for the first fastener to pass through.

[0037] In the above solution, the first fastener is housed in the countersunk hole. This, on the one hand, reduces the protrusion of the first fastener, thereby reducing the risk of scratches on the first fastener, thereby ensuring a higher connection strength between the protective plate and the housing. On the other hand, it also helps reduce the size of the battery, thereby achieving a higher energy density for the battery device.

[0038] In one or more embodiments of the first aspect, the protrusion height of the sink is H, 0mm<H≤10mm.

[0039] In the above solution, the raised height of the sink is set within a reasonable range. On the one hand, it can provide a larger assembly space for the first fastener and reduce the difficulty of assembling the first fastener. On the other hand, it can make the protective plate as a whole have a higher structural strength.

[0040] In one or more embodiments of the first aspect, the first fiber resin layer includes a plurality of first fiber reinforced prepregs stacked one above the other; and the second fiber resin layer includes a plurality of second fiber reinforced prepregs stacked one above the other.

[0041] In the above solution, while improving the strength and rigidity of the protective plate, the multi-layer structure helps to disperse stress and reduce stress concentration, thereby improving the fatigue resistance of the material.

[0042] In one or more embodiments of the first aspect, the anti-puncture plate portion is a steel plate, and the outer surface of the steel plate is provided with a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer.

[0043] In the above solution, since the outer surface of the steel plate is provided with a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer, the reinforcement layer can have higher wear resistance.

[0044] In one or more embodiments of the first aspect, the first fiber resin layer and the second fiber resin layer are each independently selected from a glass fiber reinforced polyamide resin part, a glass fiber reinforced polypropylene resin part, a glass fiber reinforced polyethylene resin part, a glass fiber reinforced polycarbonate resin part or a glass fiber reinforced polystyrene resin part.

[0045] In a second aspect, the present application provides an electrical device, which includes the battery device in one or more of the above embodiments, and the battery device is used to provide electrical energy.

[0046] In the above solution, since the battery device in one or more of the above embodiments has high reliability, the electrical device including the battery device in one or more of the above embodiments also has high reliability.

[0047] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0049] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0050] FIG2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0051] FIG3 is an exploded schematic diagram of a protective plate provided in some embodiments of the present application;

[0052] FIG4 is a schematic structural diagram of the intermediate layer shown in FIG3 ;

[0053] FIG5 is a schematic structural diagram of the protective plate shown in FIG3 ;

[0054] FIG6 is a cross-sectional view along line AA in FIG5;

[0055] FIG7 is a partial enlarged view of point B in FIG6;

[0056] FIG8 is a partial enlarged view of point C in FIG7;

[0057] FIG9 is a schematic structural diagram of a box provided in some embodiments of the present application;

[0058] FIG10 is a cross-sectional view along line DD in FIG9;

[0059] FIG11 is a partial enlarged view of point E in FIG10 .

[0060] The figure numbers in the specific implementation manner are as follows: 1000-vehicle; 1100-battery device; 1200-controller; 1300-motor; 100-protective plate; 1001-accommodating chamber; 110-first fiber resin layer; 120-middle layer; 121-resin frame; 1211-dividing strip; 122-anti-puncture plate; 1221-sub-plate; 130-second fiber resin layer; 140-adhesive layer; 150-sinking platform; 151-sinking hole; 200-box body; 300-middle beam; 410-first fastener; 420-second fastener; 500-seal; 10-box body; 11-first part; 12-second part; 20-battery cell; 30-heat exchange plate; 31-flow channel; 32-surface protrusion. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0066] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0067] Battery cells include but are not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0068] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions (such as lithium ions) move back and forth between the positive and negative electrodes. A separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0069] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical and mechanical stability.

[0070] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly is a laminate structure.

[0072] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0073] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0074] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal battery cells. Polygonal battery cells are, for example, hexagonal battery cells.

[0075] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0076] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0077] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0078] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0079] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0080] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0081] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0082] The following will mainly focus on rectangular parallelepiped battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, soft-pack battery cells, or blade battery cells in some aspects.

[0083] The development of battery technology must consider multiple design factors simultaneously, such as reliability, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the reliability of the battery device must also be considered.

[0084] A typical battery device generally includes a box body and a protective plate. The protective plate is arranged at the bottom of the box body. In order to improve the ability of the protective plate to resist the impact of the bottom of the battery device, the protective plate is generally provided with an anti-puncture plate portion. In order to further reduce the risk of corrosion of the anti-puncture plate portion, the anti-puncture plate portion is wrapped with two layers of corrosion-resistant layers. After that, the two layers of corrosion-resistant layers and the anti-puncture plate portion are processed into one body and connected to the box body to complete the assembly of the protective plate. In order to maintain a high structural stability of the anti-puncture plate portion, when connecting the anti-puncture plate portion to the box body, the area where the two are connected generally avoids the area where the anti-puncture plate portion is set. That is, the part of the protective plate located in the area where the two are connected generally only includes two layers of corrosion-resistant layers. The connection stability between the box body and the protective plate is low, and the reliability of the battery device is poor.

[0085] In view of this, the present application provides a battery device, comprising a housing, a battery cell, and a protective plate, wherein the battery cell is disposed within the housing. The protective plate is disposed at the bottom of the battery cell in the direction of gravity. The protective plate comprises a first fiber resin layer, an intermediate layer, and a second fiber resin layer stacked sequentially along a first direction. The intermediate layer comprises a resin frame portion and an anti-puncture plate portion, the anti-puncture plate portion being located within the resin frame portion and connected between the first fiber resin layer and the second fiber resin layer. Because the intermediate layer comprises the anti-puncture plate portion and the anti-puncture plate portion is located between the first fiber resin layer and the second fiber resin layer, the risk of corrosion of the anti-puncture plate portion can be reduced. When the protective plate is subjected to external forces, the anti-puncture plate portion can improve the protective plate's ability to resist external forces, thereby reducing the risk of excessive deformation of the protective plate. Furthermore, the resin frame portion can further increase the strength and rigidity of the protective plate, thereby improving the protective plate's ability to resist external impacts and also contributing to improved reliability of the battery device. In embodiments where the protective plate is connected to the housing via the resin frame portion, the provision of the resin frame portion can also improve the stability of the connection between the protective plate and the housing.

[0086] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices, and electrical devices using the battery devices.

[0087] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. Electrical devices can also be energy storage devices, such as energy storage cabinets and energy storage containers.

[0088] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0089] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 1100 is provided inside the vehicle 1000, and the battery device 1100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 1100 can be used to power the vehicle 1000. For example, the battery device 1100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery device 1100 to power the motor 1300, for example, for starting, navigating and driving the vehicle 1000.

[0090] In some embodiments of the present application, the battery device 1100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0091] 2 , the battery device 1100 includes a housing 10 and battery cells 20. The battery cells 20 are accommodated in the housing 10. The housing 10 is used to provide a space for accommodating the battery cells 20. The housing 10 can adopt various structures.

[0092] In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which cover each other and together define a storage space for accommodating the battery cells 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 may also be hollow structures with one end open, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0093] In the battery device 1100 , there may be multiple battery cells 20 , and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are connected in both series and in parallel.

[0094] In one embodiment, multiple battery cells 20 may be directly connected in series, parallel, or hybrid, and the entire battery assembly 20 may then be housed within the housing 10. Alternatively, the battery assembly 1100 may be constructed by first connecting multiple battery cells 20 in series, parallel, or hybrid to form a battery module, which is then connected in series, parallel, or hybrid to form a complete assembly and housed within the housing 10. The battery assembly 1100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0095] In this application, the battery cells 20 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, lithium metal batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. The battery cells 20 may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. The battery cells 20 are generally divided into three types based on the packaging method: cylindrical battery cells 20, prismatic battery cells 20, and soft-pack battery cells 20.

[0096] Referring to Figures 3 to 8 , which are representative schematic diagrams of a protective plate 100 provided in an embodiment of the present application, the protective plate 100 provided in the embodiment of the present application is described using a battery device 1100 as an example for use in an electrical device. Those skilled in the art will readily appreciate that various modifications, additions, substitutions, deletions, or other changes may be made to the following embodiments in order to adapt the design of the protective plate 100 provided in the embodiment of the present application to other applications, and such modifications remain within the scope of the principles of the electrical device provided in the embodiment of the present application.

[0097] According to some embodiments of the present application, referring to FIG. 3 to FIG. 8 , the present application provides a battery device 1100, which includes a housing 10, a battery cell 20, and a protective plate 100. The battery cell 20 is disposed within the housing 10. Along the direction of gravity, the protective plate 100 is disposed at the bottom of the battery cell 20. The protective plate 100 includes a first fiber resin layer 110, an intermediate layer 120, and a second fiber resin layer 130 stacked sequentially along a first direction. The intermediate layer 120 includes a resin frame portion 121 and an anti-puncture plate portion 122. The anti-puncture plate portion 122 is located within the resin frame portion 121. The resin frame portion 121 is connected between the first fiber resin layer 110 and the second fiber resin layer 130.

[0098] The first fiber resin layer 110 may also be referred to as a first fiber resin layer, and the second fiber resin layer 130 may also be referred to as a second fiber resin layer.

[0099] In some embodiments, the protection plate 100 may be a component used to protect the battery cells 20 in the battery device 1100 .

[0100] In some embodiments, the protective plate 100 can be used to support the battery cells 20. In other embodiments, the battery device 1100 further includes a heat exchange plate 30 disposed between the protective plate 100 and the battery cells 20 to support the battery cells 20.

[0101] The first direction may refer to the thickness direction of the protective plate 100. Referring to FIG3 , the protective plate 100 has a thickness direction, a length direction, and a width direction. The thickness direction of the protective plate 100 may be referred to as the Z direction in the figure, the width direction of the protective plate 100 may be referred to as the Y direction in the figure, and the length direction of the protective plate 100 may be referred to as the X direction in the figure.

[0102] The intermediate layer 120 may be a layer located between the first fiber resin layer 110 and the second fiber resin layer 130. The intermediate layer 120 plays a primary protective role, preventing foreign objects from piercing the protective plate 100. In other words, if the protective plate 100 is pierced by a foreign object, the provision of the intermediate layer 120 can reduce the risk of the foreign object penetrating the protective plate 100 and damaging the battery cells 20.

[0103] The middle layer 120 includes a resin frame portion 121 and an anti-puncture plate portion 122. The anti-puncture plate portion 122 may refer to the central portion of the middle layer 120, and the resin frame portion 121 may be annular and disposed around the anti-puncture plate portion 122. In some embodiments, the resin frame portion 121 may refer to the edge portion of the middle layer 120. The shape of the resin frame portion 121 may include, but is not limited to, a square shape, a U-shape, a sun-shaped shape, a field-shaped shape, and the like.

[0104] In some embodiments, the connection area between the housing 10 and the protective plate 100 is located within the resin frame 121. For example, using fasteners, the fasteners sequentially pass through the second fiber resin layer 130, the resin frame 121, and the first fiber resin layer 110 before being connected to the housing 10. For example, using welding or heat-melting, at least a portion of the projection of the weld mark formed by the welding or heat-melting connection is located within the resin frame 121 along the first direction.

[0105] In some embodiments, the first fiber resin layer 110 , the resin frame 121 , and the second fiber resin layer 130 may be connected by structural adhesive.

[0106] In some embodiments, the first fiber resin layer 110 , the resin frame 121 , and the second fiber resin layer 130 may be bonded together by the adhesiveness of the resin portions thereof and the adhesiveness of the resin frame 121 .

[0107] In some embodiments, the provision of the first fiber resin layer 110 and the second fiber resin layer 130 can enable the protective plate 100 to have a stronger fire resistance, such as a fiber resin composite material including fibers such as carbon fiber, aramid fiber, or glass fiber.

[0108] In some embodiments, the protective plate 100 can be connected to the box body 10 by fasteners passing through the first fiber resin layer 110, the second fiber resin layer 130 and the resin frame 121. Since the fasteners pass through the resin frame 121, the risk of fastener failure is low, and the connection stability between the protective plate 100 and the box body 10 is high.

[0109] In some embodiments, the first fiber resin layer 110, the second fiber resin layer 130, and the resin frame 121 can be connected by various methods, such as riveting, resin adhesive connection, gluing, laser welding, hot pressing, etc. Due to the provision of the resin frame 121, compared to embodiments without the resin frame 121, the connection strength between the protective plate 100 and the box body 10 is improved while not interfering with the anti-puncture component.

[0110] In some embodiments, the provision of the first fiber resin layer 110 or the second fiber resin layer 130 can have an effect of preventing the middle layer 120 from corrosion.

[0111] The material of the resin frame 121 may include thermosetting resins, such as epoxy resins, phenolic resins, urea-formaldehyde resins, melamine resins, unsaturated polyester resins, silicone resins, polyurethanes, etc. It may also include thermoplastic resins, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc. Of course, the material of the resin frame 121 may also include, but is not limited to, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, etc.

[0112] In the technical solution of the embodiment of the present application, since the intermediate layer 120 includes the anti-puncture plate portion 122 and the anti-puncture plate portion 122 is located between the first fiber resin layer 110 and the second fiber resin layer 130, the risk of corrosion of the anti-puncture plate portion 122 can be reduced. When the protective plate 100 is subjected to external force, the anti-puncture plate portion 122 can improve the ability of the protective plate 100 to resist external force, thereby reducing the risk of excessive deformation of the protective plate 100. At the same time, the resin frame portion 121 can further improve the strength and rigidity of the protective plate 100, thereby improving the ability of the protective plate 100 to resist external force impact, and is also conducive to improving the reliability of the battery device 1100. In the embodiment where the protective plate 100 is connected to the case 10 via the resin frame portion 121, the provision of the resin frame portion 121 can also improve the connection stability between the protective plate 100 and the case 10.

[0113] According to some embodiments of the present application, please refer to Figures 3 to 8. The anti-puncture plate portion 122 includes a plurality of spaced-apart sub-plate portions 1221. The resin frame portion 121 has a partition bar 1211 therein. The partition bar 1211 is provided between two adjacent sub-plate portions 1221.

[0114] The separator 1211 is part of the resin frame 121 and is also made of resin. The separator 1211 divides the resin frame 121 into multiple areas. The multiple sub-plates 1221 are installed in each area in a one-to-one correspondence, so that the separator 1211 separates two adjacent sub-plates 1221. The number of sub-plates 1221 can be, but is not limited to, two, three, or four.

[0115] For example, there are two sub-plate portions 1221, which are spaced apart along the length of the protective plate 100. In other embodiments, the sub-plate portions 1221 may be arranged in a matrix or spaced apart along the width of the protective plate 100, depending on actual design requirements.

[0116] In the above solution, the multiple sub-plates 1221 are spaced apart to optimize stress distribution within the protective plate 100, reducing the risk of excessive deformation due to a single point of stress on the protective plate 100. The separation strips 1211 serve as an assembly reference for the sub-plates 1221, improving assembly efficiency of the protective plate 100.

[0117] According to some embodiments of the present application, the anti-puncture plate portion 122 is a flat plate structure.

[0118] The anti-puncture plate portion 122 is a flat plate structure, which means that along the first direction, two opposite surfaces of the anti-puncture plate portion 122 are planes.

[0119] In the above solution, since the anti-puncture plate portion 122 is a flat plate structure, the risk of stress concentration on the anti-puncture plate portion 122 is low and the structural stability is high.

[0120] According to some embodiments of the present application, the protective plate 100 is a flat plate structure.

[0121] The protective plate 100 is a flat plate structure, which means that along a first direction, two opposite surfaces of the protective plate 100 are flat. In some embodiments, the first fiber resin layer 110 and the second fiber resin layer 130 are both flat plate structures.

[0122] In the above solution, since the protective plate 100 is a flat plate, it can be processed through an extrusion process, which improves the production efficiency of the protective plate 100. Furthermore, it reduces the difficulty of assembling the housing 10 and the protective plate 100. Furthermore, it also reduces the risk of sealing failure between the housing 10 and the protective plate 100.

[0123] According to some embodiments of the present application, referring to FIG. 4 , the width of the protective plate 100 is W. In the width direction of the protective plate 100 , the size of the anti-puncture plate portion 122 is w, and 0.6≤w / W<1.

[0124] The width W of the protection plate 100 may refer to the distance between two opposite surfaces of the protection plate 100 along the width direction.

[0125] In the width direction of the protection plate 100 , the dimension w of the anti-puncture plate portion 122 may refer to the distance between two opposite surfaces of the anti-puncture plate portion 122 along the width direction of the protection plate 100 .

[0126] 0.6≤w / W<1. It can be understood that when w / W<1, the resin frame portion 121 occupies a certain space in the width direction of the protective plate 100 to connect the first fiber resin layer 110 and the second fiber resin layer 130; when w / W≥0.6, the resin frame portion 121 occupies a smaller space in the width direction of the protective plate 100, and the anti-puncture plate portion 122 occupies a larger space, which can provide better protection for the battery cell 20 and the protective effect of the protective plate 100 is good.

[0127] In some embodiments, the value of w / W can be 0.6 and any number between 0.6 and 1; for example, the value of w / W can be but is not limited to 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, 0.72, 0.74, 0.76, 0.78, 0.8, 0.82, 0.84, 0.86, 0.88, 0.9, 0.92, 0.94, 0.96, 0.98, and 0.99.

[0128] In the above solution, the size of the anti-puncture plate portion 122 is set within a reasonable range in the width direction of the protective plate 100. While the protective plate 100 has a high structural strength and a large anti-puncture area, the weight of the protective plate 100 can also be controlled within a reasonable range, thereby enabling the battery device 1100 to have a higher energy density.

[0129] According to some embodiments of the present application, referring to FIG. 4 , the length of the protective plate 100 is L, and in the length direction of the protective plate 100 , the dimension of the anti-puncture plate portion 122 is l, and 0.6≤l / L<1.

[0130] The length L of the protection plate 100 may refer to the distance between two opposite surfaces of the protection plate 100 along the length direction.

[0131] In the length direction of the protection plate 100 , the dimension l of the anti-puncture plate portion 122 may refer to the distance between two opposite surfaces of the anti-puncture plate portion 122 along the length direction of the protection plate 100 .

[0132] 0.6≤l / L<1. It can be understood that when l / L<1, the resin frame portion 121 occupies a certain space in the length direction of the protective plate 100 to connect the first fiber resin layer 110 and the second fiber resin layer 130; when l / L≥0.6, the resin frame portion 121 occupies a smaller space in the length direction of the protective plate 100, and the anti-puncture plate portion 122 occupies a larger space, which can provide better protection for the battery cell 20 and the protective effect of the protective plate 100 is good.

[0133] In some embodiments, the value of l / L can be 0.6 and any number between 0.6 and 1; for example, the value of l / L can be but is not limited to 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, 0.72, 0.74, 0.76, 0.78, 0.8, 0.82, 0.84, 0.86, 0.88, 0.9, 0.92, 0.94, 0.96, 0.98, and 0.99.

[0134] In the above solution, the size of the anti-puncture plate portion 122 is set within a reasonable range in the length direction of the protective plate 100. While the protective plate 100 has a high structural strength and a large anti-puncture area, the weight of the protective plate 100 can also be controlled within a reasonable range, thereby enabling the battery device 1100 to have a higher energy density.

[0135] According to some embodiments of the present application, referring to FIG. 5 to FIG. 8 , the thickness of the resin frame portion 121 is equal to the thickness of the anti-puncture plate portion 122 .

[0136] The plate thickness h5 of the resin frame 121 may refer to a distance between two opposing surfaces of the resin frame 121 along the first direction.

[0137] The plate thickness h3 of the anti-puncture plate portion 122 may refer to the distance between two opposite surfaces of the anti-puncture plate portion 122 along the first direction.

[0138] In the above solution, since the thickness of the resin frame 121 is equal to the thickness of the puncture-proof plate 122, this facilitates a closer fit between the first fiber resin layer 110 and the second fiber resin layer 130 and the surface of the intermediate layer 120, thereby improving the connection strength between the first fiber resin layer 110, the second fiber resin layer 130, and the intermediate layer 120. Furthermore, the risk of stress concentration between the resin frame 121 and the puncture-proof plate 122 is reduced.

[0139] According to some embodiments of the present application, referring to FIG. 8 , the thickness of the second fiber resin layer 130 is greater than the thickness of the first fiber resin layer 110 .

[0140] The layer thickness h1 of the first fiber resin layer 110 may refer to a distance between two opposite surfaces of the first fiber resin layer 110 along the first direction.

[0141] The layer thickness h2 of the second fiber resin layer 130 may refer to a distance between two opposite surfaces of the second fiber resin layer 130 along the first direction.

[0142] In the above solution, since the thickness of the second fiber resin layer 130 is greater than the thickness of the first fiber resin layer 110, the second fiber resin layer 130 has a higher structural strength, which can reduce the risk of excessive deformation of the protective plate 100 and corrosion of the anti-puncture plate portion 122 caused by external force acting on the protective plate 100 through the second fiber resin layer 130.

[0143] According to some embodiments of the present application, referring to FIG. 8 , the thickness of the first fiber resin layer 110 is h1, where 0

[0144] 00, so that the first fiber resin layer 110 has a certain thickness, which can protect the anti-puncture plate portion 122; h1≤1.2mm, so that the thickness of the first fiber resin layer 110 is not too thick, which is beneficial to reducing the manufacturing cost of the protective plate 100 and also reducing the space occupied by the protective plate 100 on the battery device 1100, which is beneficial to reducing the size of the battery device 1100.<h1>

[0145] In some embodiments, the value of h1 can be 1.2 mm and any number between 0 and 1.2 mm; for example, the value of h1 can be but is not limited to 0.1 mm, 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, and 1.2 mm.

[0146] ​In the above solution, the thickness of the first fiber resin layer 110 is set within a reasonable range. The first fiber resin layer 110 has a high ability to resist external impact, reducing the risk of corrosion of the anti-puncture plate portion 122, while also enabling the battery device 1100 to have a higher energy density and lower manufacturing cost.

[0147] According to some embodiments of the present application, referring to FIG. 8 , the thickness of the second fiber resin layer 130 is h2, where 0<h2≤1.2 mm.

[0148] 0<h2≤1.2mm. It can be understood that h2>0, so that the second fiber resin layer 130 has a certain thickness, which can play a protective role for the anti-puncture plate portion 122; h2≤1.2mm, so that the thickness of the second fiber resin layer 130 is not too thick, which is beneficial to reducing the manufacturing cost of the protective plate 100 and also reducing the space occupied by the protective plate 100 on the battery device 1100, which is beneficial to reducing the size of the battery device 1100.

[0149] In some embodiments, the value of h2 can be 1.2 mm and any number between 0 and 1.2 mm; for example, the value of h2 can be but is not limited to 0.1 mm, 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, and 1.2 mm.

[0150] In the above solution, the thickness of the second fiber resin layer 130 is set within a reasonable range. The second fiber resin layer 130 has a high ability to resist external impact, reducing the risk of corrosion of the anti-puncture plate portion 122, while also enabling the battery device 1100 to have a higher energy density and lower manufacturing cost.

[0151] According to some embodiments of the present application, referring to FIG. 8 , the thickness of the anti-puncture plate portion 122 is h3, where 0<h3≤1 mm.

[0152] 0<h3≤1mm. It can be understood that h3>0, so that the anti-puncture plate portion 122 has a certain thickness, which can play an anti-puncture role; h3≤1mm, so that the thickness of the anti-puncture plate portion 122 is not too thick, which is beneficial to reducing the manufacturing cost of the protective plate 100.

[0153] In some embodiments, the value of h3 can be 1 mm and any number between 0 and 1 mm; for example, the value of h3 can be but is not limited to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0154] In the above solution, the thickness of the anti-puncture plate portion 122 is set within a reasonable range. While the protective plate 100 has a high ability to resist external impact, the battery device 1100 can also have a high energy density and a low manufacturing cost.

[0155] According to some embodiments of the present application, referring to FIG. 8 , the protective plate 100 further includes an adhesive layer 140 , and the first fiber resin layer 110 and the intermediate layer 120 are bonded together by the adhesive layer 140 ; ​​and / or, the second fiber resin layer 130 and the intermediate layer 120 are bonded together by the adhesive layer 140 .

[0156] The adhesive layer 140 may refer to a layered material capable of bonding two components. The adhesive layer 140 may refer to a layered structure formed by curing glue applied between the two components. It may also refer to a layered component with adhesive properties on both sides, such as double-sided tape. Of course, it may also refer to other structures.

[0157] In the above solution, the provision of the adhesive layer 140 can improve the connection strength between the intermediate layer 120 and the first fiber resin layer 110, and reduce the risk of corrosion of the anti-puncture plate portion 122 due to separation of the intermediate layer 120 and the first fiber resin layer 110, and / or the second fiber resin layer 130.

[0158] According to some embodiments of the present application, referring to FIG. 8 , the adhesive layer 140 includes a resin film layer.

[0159] The adhesive layer 140 is constructed of a resin film. Resin film refers to a material used for bonding. The principle is to form a uniform and durable bonding surface on the surface of the resin film by utilizing the properties of the resin, thereby achieving a bonding effect. Examples include double-sided tape, hot melt adhesive film, epoxy resin film, etc.

[0160] In the above solution, the resin film layer is used as the adhesive layer 140 . On the one hand, it is more tightly bonded to the fiber resin layer. On the other hand, it is beneficial to reduce the weight of the protective plate 100 and improve the energy density of the battery device 1100 .

[0161] According to some embodiments of the present application, referring to FIG. 8 , the thickness of the adhesive layer 140 is h4, where 0<h4≤0.5 mm.

[0162] The thickness h4 of the adhesive layer 140 may refer to the distance between two opposing surfaces of the adhesive layer 140 in the first direction. 0 < h4 ≤ 0.5 mm. It is understood that h4 > 0 ensures that the adhesive layer 140 has a certain thickness to achieve adhesion. When h4 ≤ 0.5 mm, the adhesive layer 140 is not too thick, improving the adhesive strength of the adhesive layer 140 and reducing the risk of delamination of the protective plate 100, material waste, and manufacturing costs.

[0163] In some embodiments, the value of h4 may be 0, 0.5 mm, or any number between 0 and 0.5 mm. For example, the value of h4 may be, but is not limited to, 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0164] In the above solution, by setting the thickness of the adhesive layer within a reasonable range, a strong connection strength can be achieved between the fiber resin layer and the intermediate layer 120 , while enabling the battery device 1100 to have a higher energy density.

[0165] According to some embodiments of the present application, please refer to Figures 9 to 11, the area corresponding to the protective plate 100 and the anti-puncture plate portion 122 is recessed along the first direction to form a accommodating cavity 1001, and the bottom surface of the accommodating cavity 1001 is raised in the opposite direction of the first direction to form a sink 150, and the sink 150 is surrounded by a sink hole 151 for the first fastener 410 to pass through.

[0166] The area corresponding to the protective plate 100 and the anti-puncture plate portion 122 is recessed along the first direction to form the accommodating cavity 1001; it can be understood that the middle area of ​​the protective plate 100 may be recessed, that is, the protective plate 100 may be a basin-shaped structure, thereby forming the accommodating cavity 1001; or the anti-puncture plate portion 122 may be a flat plate structure, and the inner side of the resin frame portion 121 is stretched to form a basin-shaped structure with an opening at the bottom; the anti-puncture plate portion 122 is located on the bottom wall of the accommodating cavity 1001, thereby protecting the components in the accommodating cavity 1001 and the components located on the side of the accommodating cavity 1001.

[0167] When the protective plate 100 is installed on the battery device 1100, the bottom surface of the accommodating cavity 1001 has a protrusion, which protrudes from the bottom surface of the accommodating cavity 1001. The protrusion is the sink 150. The surface of the protective plate 100 facing away from the accommodating cavity 1001 will form a recessed area, which is formed as a countersunk hole 151. The countersunk hole 151 can penetrate the bottom surface of the accommodating cavity 1001. In this way, the first fastener 410 can pass through the protective plate 100 and the heat exchange plate 30 from the outside of the battery device 1100 through the countersunk hole 151, thereby connecting with the middle beam 300, expansion beam and other components in the box body 10 to improve the installation reliability of the protective plate 100. The sink 150 can penetrate the area of ​​the resin frame portion 121 used to form the cavity bottom wall of the accommodating cavity 1001, and can also penetrate the anti-puncture plate portion 122. The first fastener 410 can be a bolt, a screw, etc.

[0168] In the above solution, the first fastener 410 is received in the countersunk hole 151. This, on the one hand, reduces the protrusion of the first fastener 410, thereby reducing the risk of the first fastener 410 being scratched, thereby facilitating a higher connection strength between the protective plate 100 and the housing 10. Furthermore, this also helps reduce the size of the battery, thereby enabling the battery device 1100 to have a higher energy density.

[0169] According to some embodiments of the present application, referring to FIG. 9 to FIG. 11 , the protrusion height of the sink 150 is H, 0 mm < H ≤ 10 mm.

[0170] The protruding height H of the sink 150 may refer to the distance between the surface of the sink 150 facing away from the bottom surface of the accommodating cavity 1001 and the bottom surface of the accommodating cavity 1001 .

[0171] 0mm<H≤10mm. It can be understood that when H>0, the sink 150 has a certain protruding height, and a recessed countersunk hole 151 is formed on the other side of the protective plate 100 to accommodate the first fastener 410, which is beneficial to reducing the protruding height of the first fastener 410; when H≤10mm, the protruding height H of the sink 150 will not be too large to reduce the risk of the overall structural strength of the protective plate 100 being too low.

[0172] In some embodiments, the value of H can be 10 mm and any number between 0 and 10 mm; for example, the value of H can be but is not limited to 0.1 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, and 10 mm.

[0173] In the above solution, the raised height of the sink 150 is set within a reasonable range. On the one hand, it can provide a larger assembly space for the first fastener 410 and reduce the difficulty of assembling the first fastener 410. On the other hand, it can make the protective plate 100 as a whole have a higher structural strength.

[0174] According to some embodiments of the present application, the first fiber resin layer 110 includes a plurality of first fiber reinforced prepregs stacked one on another; and the second fiber resin layer 130 includes a plurality of second fiber reinforced prepregs stacked one on another.

[0175] The fibers in each layer of the first fiber-reinforced prepreg are arranged unidirectionally. The fibers of two adjacent layers of the first fiber-reinforced prepreg are arranged in a staggered arrangement at approximately 90°. The allowable deviation range for the layup angles of two adjacent layers of the first fiber-reinforced prepreg unidirectional tapes 111 is ±20°. When subjected to a tensile force along the fiber extension direction, the fibers in the first fiber-reinforced prepreg are able to effectively withstand the tensile force. By staggering the fibers of adjacent first fiber-reinforced prepregs at approximately 90°, the uniformity of the force applied to the first fiber resin layer 110 in all directions is improved.

[0176] In another embodiment, the fibers in the first fiber-reinforced prepreg are interlaced to form a woven fabric.

[0177] The fiber arrangement of the second fiber reinforced prepreg is similar to that of the first fiber reinforced prepreg, and will not be described in detail.

[0178] In the above solution, while improving the strength and rigidity of the protective plate 100, the multi-layer structure helps to disperse stress and reduce stress concentration, thereby improving the fatigue resistance of the material.

[0179] According to some embodiments of the present application, the anti-puncture plate portion 122 is a steel plate, and the outer surface of the steel plate is provided with a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer.

[0180] In the above solution, since the outer surface of the steel plate is provided with a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer, the reinforcement layer can have higher wear resistance.

[0181] According to some embodiments of the present application, the first fiber resin layer 110 and the second fiber resin layer 130 are each independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin or glass fiber reinforced polystyrene resin.

[0182] According to some embodiments of the present application, please refer to FIG. 1 . The present application provides an electrical device, which includes the battery device 1100 in one or more of the above embodiments. The battery device 1100 is used to provide electrical energy.

[0183] In the above solution, since the battery device 1100 in one or more of the above embodiments has high reliability, the electrical device including the battery device 1100 in one or more of the above embodiments also has high reliability.

[0184] According to some embodiments of the present application, referring to Figures 3-8 , a battery device 1100 is provided. The battery device 1100 includes a housing 10, a battery cell 20, and a protective plate 100. The battery cell 20 is disposed within the housing 10. The protective plate 100 is disposed at the bottom of the battery cell 20 in the direction of gravity. The protective plate 100 includes a first fiber resin layer 110, an intermediate layer 120, and a second fiber resin layer 130 stacked sequentially along a first direction. The intermediate layer 120 includes a resin frame 121 and an anti-puncture plate 122. The anti-puncture plate 122 is located within the resin frame 121 and connected between the first fiber resin layer 110 and the second fiber resin layer 130. The anti-puncture plate 122 includes a plurality of spaced-apart sub-plates 1221. The resin frame 121 includes a separator 1211 disposed between two adjacent sub-plates 1221. The anti-puncture plate 122 is a flat plate. The thickness of the resin frame portion 121 is equal to that of the anti-puncture plate portion 122. The thickness of the second fiber resin layer 130 is greater than that of the first fiber resin layer 110. The area of ​​the protective plate 100 corresponding to the anti-puncture plate portion 122 is recessed along a first direction to form a receiving cavity 1001. The bottom surface of the receiving cavity 1001 is raised in the opposite direction of the first direction to form a recessed platform 150. The recessed platform 150 surrounds a countersunk hole 151 for receiving the first fastener 410.

[0185] A heat exchange plate 30 is also provided between the battery cell 20 and the protective plate 100. The heat exchange plate 30 may refer to a component that exchanges heat with the battery cell 20. A flow channel 31 is provided in the heat exchange plate 30. A heat exchange medium flows in the heat exchange plate 30, thereby realizing heat exchange of the battery device 1100. The heat exchange medium may heat the battery cell 20 or cool the battery cell 20, and its specific design may be based on needs. The heat exchange medium may be, but is not limited to, water, air, refrigerant, etc. The heat exchange plate 30 includes two plates, at least one of which has a surface depression that docks with the other plate, thereby forming a flow channel 31. The protrusion formed on the surface of the heat exchange plate 30 by the depression of the flow channel 31 is the surface protrusion 32. The battery cells 20 are located inside the main body 200, and the heat exchange plate 30 covers the opening of the main body 200. The protective plate 100 is installed on the side of the heat exchange plate 30 facing away from the battery cells 20 to protect the battery cells 20 and the heat exchange plate 30. The second fasteners 420 pass through the periphery of the protective plate 100 and the periphery of the heat exchange plate 30 before being connected to the main body 200. A seal 500 is sandwiched between the periphery of the protective plate 100 and the periphery of the heat exchange plate 30 to achieve a seal in the box 10. The second fasteners 420 can be, but are not limited to, screws or bolts; the seal 500 can be, but is not limited to, sealant or a sealing ring. The protective plate 100 can be located on the top or bottom of the battery assembly 1100.

[0186] 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: Box; A battery cell, wherein the battery cell is disposed in the box; A protective plate is arranged at the bottom of the battery cell along the direction of gravity. The protective plate includes a first fiber resin layer, an intermediate layer and a second fiber resin layer stacked in sequence along a first direction. The intermediate layer includes a resin frame portion and an anti-puncture plate portion. The anti-puncture plate portion is located in the resin frame portion, and the resin frame portion is connected between the first fiber resin layer and the second fiber resin layer.

2. The battery device according to claim 1, wherein: The anti-puncture plate portion includes a plurality of sub-plate portions arranged at intervals. A partition bar is provided in the resin frame portion, and the partition bar is provided between two adjacent sub-plate portions.

3. The battery device according to any one of claims 1 to 2, characterized in that: The anti-puncture plate portion is a flat plate structure.

4. The battery device according to any one of claims 1 to 3, characterized in that: The protective plate is a flat plate structure.

5. The battery device according to any one of claims 1 to 4, characterized in that: The width of the protective plate is W. In the width direction of the protective plate, the size of the anti-puncture plate portion is w, and 0.6≤w / W<1.

6. The battery device according to any one of claims 1 to 5, characterized in that: The length of the protective plate is L. In the longitudinal direction of the protective plate, the dimension of the anti-puncture plate portion is l, and 0.6≤l / L<1.

7. The battery device according to any one of claims 1 to 6, characterized in that: The plate thickness of the resin frame portion is equal to the plate thickness of the puncture-preventing plate portion.

8. The battery device according to any one of claims 1 to 7, characterized in that: The second fiber resin layer has a layer thickness greater than that of the first fiber resin layer.

9. The battery device according to any one of claims 1 to 8, characterized in that: The thickness of the first fiber resin layer is h1, 0<h1≤1.2mm.

10. The battery device according to any one of claims 1 to 9, characterized in that: The thickness of the second fiber resin layer is h2, 0<h2≤1.2mm.

11. The battery device according to any one of claims 1 to 10, characterized in that: The thickness of the puncture-proof plate portion is h3, 0<h3≤1mm.

12. The battery device according to any one of claims 1 to 11, characterized in that: The protective plate further includes an adhesive layer, and the first fiber resin layer and the intermediate layer are bonded together via the adhesive layer; and / or the second fiber resin layer and the intermediate layer are bonded together via the adhesive layer.

13. The battery device according to claim 12, characterized in that The adhesive layer includes a resin film layer.

14. The battery device according to claim 12, wherein: The thickness of the adhesive layer is h4, 0<h4≤0.5mm.

15. The battery device according to any one of claims 1 to 14, characterized in that: The area of ​​the protective plate corresponding to the anti-puncture plate portion is recessed along the first direction to form a receiving cavity, and the bottom surface of the receiving cavity is raised in the opposite direction of the first direction to form a sinking platform, and the sinking platform is surrounded by a sinking hole for the first fastener to pass through.

16. The battery device according to claim 15, characterized in that The raised height of the sinking platform is H, 0mm<H≤10mm.

17. The battery device according to any one of claims 1 to 16, characterized in that: The first fiber resin layer includes a plurality of first fiber reinforced prepregs stacked one above the other; and the second fiber resin layer includes a plurality of second fiber reinforced prepregs stacked one above the other.

18. The battery device according to any one of claims 1 to 17, characterized in that: The anti-puncture plate portion is a steel plate, and the outer surface of the steel plate is provided with a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer.

19. The battery device according to any one of claims 1 to 18, characterized in that: The first fiber resin layer and the second fiber resin layer are independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin or glass fiber reinforced polystyrene resin.

20. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 19, wherein the battery device is used to provide electrical energy.

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