Battery device and electric device

Abstract

The present application relates to the technical field of batteries, and discloses a battery device and an electric device. The battery device comprises a case, battery cells and a protection plate, wherein the battery cells are arranged in the case. The protection plate is arranged outside the case. The protection plate comprises a first fiber resin layer, a reinforcement layer, a cushioning layer, and a second fiber resin layer. The reinforcement layer and the cushioning layer are located between the first fiber resin layer and the second fiber resin layer. The reinforcement layer comprises a first connecting portion and a second connecting portion. The first connecting portion is connected to both the first fiber resin layer and the second fiber resin layer, and the second connecting portion is connected to one of the first fiber resin layer and the second fiber resin layer. In the thickness direction of the protection plate, the cushioning layer has a first surface and a second surface opposite to each other, wherein the first surface is connected to the first fiber resin layer, and / or the second surface is connected to the second fiber resin layer. The battery device has high reliability.

Description

Battery device and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application No. 202411046064.5, filed on July 31, 2024, entitled “Battery device and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery device and an electric device. BACKGROUND

[0003] Energy saving and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0004] How to improve the reliability of the battery device is a problem to be solved in the battery technology. SUMMARY

[0005] In view of the above problems, the present application provides a battery device and an electric device, which can improve the reliability of the battery device.

[0006] In a first aspect, the present application provides a battery device, the battery device comprising a box body, a battery monomer and a protective plate, the battery monomer being arranged in the box body. The protective plate is arranged outside the box body, and the protective plate comprises a first fiber resin layer, a reinforcing layer, a buffer layer and a second fiber resin layer, the reinforcing layer and the buffer layer being located between the first fiber resin layer and the second fiber resin layer. The reinforcing layer comprises a first connecting portion and a second connecting portion, the first connecting portion being connected with the first fiber resin layer and the second fiber resin layer, and the second connecting portion being connected with one of the first fiber resin layer and the second fiber resin layer. In the thickness direction of the protective plate, the buffer layer has a first surface and a second surface arranged oppositely, the first surface being connected with the first fiber resin layer, and / or the second surface being connected with the second fiber resin layer.

[0007] In the scheme, the first connecting part is arranged on the first fiber resin layer and the second fiber resin layer, so that the position where the first connecting part is arranged on the protective plate has high strength, the protective plate is connected to the box at the position, and the connection stability of the protective plate and the box is improved. The second connecting part is connected to one of the first fiber resin layer and the second fiber resin layer, so that the protective plate has high corrosion resistance and strong resistance to slight impact. The buffer layer is arranged, so that the protective plate has a certain energy absorption capacity in collapse, so that the risk that the battery cell is deformed excessively due to the impact force transmitted to the inside of the box is reduced. Meanwhile, the first fiber resin layer and / or the second fiber resin layer is combined with the buffer layer to form a relatively stable integrated structure, so that the structural stability of the protective plate is improved. In summary, the battery device has high reliability.

[0008] In one or more embodiments of the first aspect, the first surface is connected to the first fiber resin layer, and the second connecting part is connected to the second surface and the second fiber resin layer on both sides.

[0009] In the scheme, one side of the buffer layer is connected to the first fiber resin layer, and the other side is connected to the reinforcing part, so that the protective plate has relatively light weight, high strength, rigidity, structural stability and corrosion resistance. When the protective plate is subjected to slight external force, the risk of failure is reduced, and the reliability of the battery device is improved.

[0010] In one or more embodiments of the first aspect, the second connecting part protrudes away from the first fiber resin layer relative to the first connecting part, the second connecting part forms a first cavity with the first fiber resin layer, and the buffer layer is arranged in the first cavity.

[0011] In the scheme, part of the buffer layer is accommodated in the cavity formed by the second connecting part and the first fiber resin layer, so that the deformation range of the buffer layer is limited, the risk of structural instability of the protective plate due to excessive deformation of the buffer layer is reduced, and the risk of damage to the buffer layer due to corrosion of foreign matters is reduced.

[0012] In one or more embodiments of the first aspect, a plurality of second connecting parts are arranged, the plurality of second connecting parts are arranged at intervals, a plurality of buffer layers are arranged, and the plurality of buffer layers correspond to the plurality of second connecting parts one by one.

[0013] In the scheme, more areas of the protective plate have energy absorption capacity in collapse, so that the reliability of the battery device is further improved.

[0014] In one or more embodiments of the first aspect, the second fiber resin layer further comprises a fourth connecting portion and a fifth connecting portion, the fifth connecting portion protrudes away from the first fiber resin layer relative to the fourth connecting portion, the fourth connecting portion is connected with the first connecting portion, and the fifth connecting portion is connected with the second connecting portion.

[0015] In the above scheme, the protective plate with the concave-convex configuration can be formed through a molding process.

[0016] In one or more embodiments of the first aspect, the second surface is connected with the second fiber resin layer, and the reinforcing layer comprises a third connecting portion, two sides of the third connecting portion are connected with the first surface and the first fiber resin layer respectively.

[0017] In the above scheme, the buffer layer can pre-absorb and disperse part of external force, reduce the risk of excessive deformation of the reinforcing layer, and is conducive to maintaining high structural stability of the protective plate when subjected to external force.

[0018] In one or more embodiments of the first aspect, the first connecting portion and the third connecting portion form a flat plate structure.

[0019] In the above scheme, the first connecting portion and the third connecting portion are processed into a flat plate structure, which can reduce the processing difficulty and cost.

[0020] In one or more embodiments of the first aspect, the second fiber resin layer comprises a fourth connecting portion and a fifth connecting portion, the fifth connecting portion protrudes away from the first fiber resin layer relative to the fourth connecting portion, the fourth connecting portion is connected with the first connecting portion, and the fifth connecting portion is connected with the second surface.

[0021] In the above scheme, the protective plate with the concave-convex configuration can be formed through a molding process.

[0022] In one or more embodiments of the first aspect, the protective plate further comprises a reinforcing member, and the reinforcing member is located on a side of the fourth connecting portion away from the first connecting portion.

[0023] In the above scheme, the reinforcing member can further enhance the structural strength of the position where the first connecting portion is arranged on the protective plate, and at the same time, the flat plate-shaped protective plate can be processed through an extrusion molding process, which is conducive to improving the production efficiency of the protective plate.

[0024] In one or more embodiments of the first aspect, the reinforcing member is a frame structure, and the reinforcing member is arranged around the fifth connecting portion.

[0025] In the above scheme, the frame-type reinforcing member arranged around the fifth connecting portion can make the strength distribution of the protective plate more uniform, and reduce the risk of stress concentration of the protective plate.

[0026] In one or more embodiments of the first aspect, the side of the reinforcing member away from the fourth connecting portion is flush with the side of the fifth connecting portion away from the first fibrous resin layer.

[0027] In the above solution, the risk of stress concentration between the reinforcing member and the second fibrous resin layer is reduced.

[0028] In one or more embodiments of the first aspect, the reinforcing member is independently selected from a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.

[0029] In one or more embodiments of the first aspect, the reinforcing member comprises a plurality of layers of first fiber reinforced prepreg stacked on each other.

[0030] In the above solution, while improving the strength and rigidity of the reinforcing member, the multi-layer structure helps to disperse stress and reduce stress concentration, thereby improving the fatigue resistance of the material.

[0031] In one or more embodiments of the first aspect, the reinforcing member has a size H1 in the thickness direction of the protective plate, and satisfies: 5.5mm≤H1≤8mm.

[0032] In the above solution, when H1≥5.5mm, the reinforcing member has sufficient thickness, which is conducive to making the protective plate have high structural strength; when H1≤8mm, the reinforcing member occupies a small space, and the battery device has high energy density; therefore, when 5.5mm≤H1≤8mm, the protective plate can have both high reliability and high energy density.

[0033] In one or more embodiments of the first aspect, the second fibrous resin layer comprises a fourth connecting portion, the fourth connecting portion is connected with the first connecting portion, the protective plate is provided with a plurality of mounting holes, and the mounting holes pass through the first fibrous resin layer, the first connecting portion and the fourth connecting portion in sequence.

[0034] In the above solution, since the mounting hole passes through the first connecting portion, the risk of torque attenuation of the fastener arranged in the mounting hole is low, which is conducive to making the protective plate and the box have high connection stability.

[0035] In one or more embodiments of the first aspect, the second fibrous resin layer further comprises a fifth connecting portion, the fifth connecting portion protrudes away from the first fibrous resin layer relative to the fourth connecting portion, and at least part of the orthographic projection of the buffer layer is located in the orthographic projection of the fifth connecting portion in the same projection plane perpendicular to the thickness direction of the protective plate.

[0036] In the scheme, when the protective plate is subjected to external force, the second fiber resin layer and the buffer layer can jointly absorb energy, thereby further improving the reliability of the battery device.

[0037] In one or more embodiments of the first aspect, the fifth connecting part is provided in plurality, the plurality of fifth connecting parts are arranged at intervals, the buffer layer is provided in plurality, the plurality of buffer layers correspond to the plurality of fifth connecting parts one by one, and the partial mounting hole is arranged between the adjacent two fifth connecting parts.

[0038] In the scheme, when the mounting hole is arranged with the fastener, the fastener can share part of the space with the buffer layer, thereby improving the energy density of the battery device.

[0039] In one or more embodiments of the first aspect, the box body comprises a beam body, and in the same projection plane perpendicular to the thickness direction of the protective plate, the mounting hole is located in the orthographic projection of the beam body.

[0040] In the scheme, after the fastener passes through the mounting hole and is connected to the beam body, the space in the box body for arranging the battery monomer is not occupied, thereby improving the energy density of the battery device. At the same time, the beam body generally has higher structural strength than other wall parts of the box body, thereby improving the connection stability between the protective plate and the box body.

[0041] In one or more embodiments of the first aspect, the battery device further comprises a fastener, the fastener comprises a head part and a rod part, the rod part passes through the mounting hole, and the head part is arranged on the side of the fourth connecting part away from the battery monomer, and in the thickness direction of the protective plate, the head part does not exceed the surface of the fifth connecting part away from the battery monomer.

[0042] In the scheme, since the head part does not exceed the surface of the fifth connecting part away from the battery monomer, the risk of external force directly acting on the fastener is low, and the risk of damage to the fastener is low, thereby making the protective plate and the box body maintain a relatively close connection, so that the battery device has higher structural stability and reliability.

[0043] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the battery monomer at least partially overlaps with the orthographic projection of the fifth connecting part.

[0044] In the scheme, the external force will be dispersed through the fifth connecting part and the buffer layer before being transmitted to the battery monomer, thereby weakening the influence of the external force on the battery monomer and improving the reliability of the battery device.

[0045] In one or more embodiments of the first aspect, the battery device further comprises a reinforcing member, the reinforcing member is arranged on the side of the fourth connecting part away from the first fiber resin layer, the reinforcing member is arranged around the fifth connecting part, and the mounting hole sequentially passes through the first fiber resin layer, the first connecting part, the fourth connecting part, and the reinforcing member.

[0046] In the above solution, the mounting hole passes through the first connecting portion and the reinforcing member, and the risk of torsion force attenuation of the fastener arranged in the mounting hole can be further reduced.

[0047] In one or more embodiments of the first aspect, the first fiber resin layer is in a flat plate structure, and the first fiber resin layer is located on the side of the first connecting portion facing the battery box.

[0048] In the above solution, since the first fiber resin layer is in a flat plate structure, the first fiber resin layer can uniformly distribute the impact load, and the risk of excessive deformation of part of the battery monomers in the battery box can be reduced.

[0049] In one or more embodiments of the first aspect, the protective plate further comprises an edge sealing portion, the reinforcing layer has a third surface and a fourth surface opposite along the thickness direction thereof, and an outer peripheral surface connecting the third surface and the fourth surface, and the edge sealing portion is wrapped on the outer peripheral surface and connects the first fiber resin layer and the second fiber resin layer.

[0050] In the above solution, the arrangement of the edge sealing portion can reduce the risk of corrosion of the exposed reinforcing layer, and the reliability of the battery device can be improved.

[0051] In one or more embodiments of the first aspect, the material of the edge sealing portion comprises resin.

[0052] In one or more embodiments of the first aspect, the size of the edge sealing portion in the direction perpendicular to the outer peripheral surface is D, and satisfies: 1mm≤D≤10mm.

[0053] In the above solution, when D≥1mm, the risk of exposure of the reinforcing layer can be reduced, and the battery device has higher reliability; when D≤10mm, the edge sealing portion occupies less space of the protective plate, and the structural strength of the protective plate is higher; therefore, when 1mm≤D≤10mm, the risk of exposure of the reinforcing layer is reduced while the protective plate has higher structural strength.

[0054] In one or more embodiments of the first aspect, the protective plate further comprises a bonding layer, the first connecting portion and the first fiber resin layer and the second fiber resin layer are connected through the bonding layer, and the second connecting portion and the first fiber resin layer are bonded through the bonding layer.

[0055] Alternatively, the second connecting portion and the second fiber resin layer are bonded through the bonding layer.

[0056] In the above solution, by arranging the bonding layer, the connection of each part of the protective plate can be more close, and the structure is more stable.

[0057] In one or more embodiments of the first aspect, the bonding layer comprises a resin film layer.

[0058] In one or more embodiments of the first aspect, the thickness of the adhesive layer is T, and 0 mm < T ≤ 0.5 mm.

[0059] In the above scheme, when T > 0 mm, the adhesive strength of each part of the protective plate is higher, and the structural stability is stronger, so that the battery device has higher reliability; when T ≤ 0.5 mm, the space occupied by the adhesive layer is smaller, and the energy density of the battery device is higher; therefore, when 0 mm < T ≤ 0.5 mm, the battery device can have higher reliability and energy density.

[0060] In one or more embodiments of the first aspect, the first fiber resin layer is independently selected from a glass fiber reinforced polyamide resin piece, a glass fiber reinforced polypropylene resin piece, a glass fiber reinforced polyethylene resin piece, a glass fiber reinforced polycarbonate resin piece, or a glass fiber reinforced polystyrene resin piece.

[0061] And / or, the second fiber resin layer is independently selected from a glass fiber reinforced polyamide resin piece, a glass fiber reinforced polypropylene resin piece, a glass fiber reinforced polyethylene resin piece, a glass fiber reinforced polycarbonate resin piece, or a glass fiber reinforced polystyrene resin piece.

[0062] In one or more embodiments of the first aspect, the first fiber resin layer comprises a plurality of layers of second fiber reinforced prepregs stacked with each other; and / or, the second fiber resin layer comprises a plurality of layers of third fiber reinforced prepregs stacked with each other.

[0063] In the above scheme, 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.

[0064] In one or more embodiments of the first aspect, the material of the buffer layer comprises at least one of basswood, honeycomb, rubber, foamed material, and hard polyurethane.

[0065] In one or more embodiments of the first aspect, the material of the reinforcing layer comprises at least one of steel, titanium, ceramic, and high-strength plastic.

[0066] In one or more embodiments of the first aspect, the thickness of the second fiber resin layer is H2, and satisfies: 0.6 mm ≤ H2 ≤ 2 mm; and / or, the thickness of the first fiber resin layer is H3, and satisfies: 0.4 mm ≤ H3 ≤ 1.5 mm; and / or, the thickness of the reinforcing layer is H4, and satisfies: 0.3 mm ≤ H4 ≤ 1.2 mm.

[0067] In the above scheme, when H2≥0.6 mm, the second fiber resin layer has a larger thickness and has a stronger ability to resist the impact of the stones; when H2≤2 mm, the second fiber resin layer occupies a smaller space, and the battery device has a higher energy density; therefore, when 0.6 mm≤H2≤2 mm, the second fiber resin layer has a stronger ability to resist the impact of the stones, and the battery device also has a higher energy density.

[0068] When H3≥0.4 mm, the first fiber resin layer has a stronger ability to distribute the load, and the impact force transmitted to the battery cell can be weakened; when H3≤1.5 mm, the first fiber resin layer occupies a smaller space, and the battery has a higher energy density; therefore, when 0.4 mm≤H3≤1.5 mm, the first fiber resin layer has a stronger ability to distribute the load, and the battery also has a higher energy density.

[0069] When H4≥0.3 mm, the reinforcing layer has a larger thickness, and the structural strength of the protection plate is higher; when H4≤1.2 mm, the reinforcing layer occupies a smaller space, and the battery device has a higher energy density; therefore, when 0.3 mm≤H4≤1.2 mm, the battery device has a higher structural strength and energy density.

[0070] In a second aspect, the application provides a power consumption device, which includes the battery device in one or more embodiments of the first aspect, and the battery device is used to provide electric energy.

[0071] In the above scheme, since the battery device in one or more embodiments of the first aspect has a higher reliability, the power consumption device including the battery device in one or more embodiments of the first aspect also has a higher reliability.

[0072] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the specification, and in order to make other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0073] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar elements. In the drawings:

[0074] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the application;

[0075] FIG. 2 is an exploded view of a battery device according to some embodiments of the application;

[0076] Fig. 3 is an exploded view of a shield plate according to some embodiments of the present application;

[0077] Fig. 4 is a cross-sectional view of a shield plate according to some embodiments of the present application;

[0078] Fig. 5 is a cross-sectional view of a shield plate according to further embodiments of the present application;

[0079] Fig. 6 is a cross-sectional view of a shield plate according to still further embodiments of the present application;

[0080] Fig. 7 is a cross-sectional view of a partial structure of a battery according to some embodiments of the present application;

[0081] Fig. 8 is a cross-sectional view of a shield plate according to still further embodiments of the present application.

[0082] Reference Signs in the Drawings

[0083] 1000 - vehicle; 200 - controller; 300 - motor; 100 - battery device; 11 - case; 111 - first case; 112 - second case; 113 - beam; 12 - battery cell; 13 - shield plate; 131 - first fiber resin layer; 132 - second fiber resin layer; 1321 - fourth connecting portion; 1322 - fifth connecting portion; 133 - buffer layer; 1331 - first surface; 1332 - second surface; 134 - reinforcing layer; 1341 - first connecting portion; 1342 - second connecting portion; 1343 - third connecting portion; 135 - reinforcing member; 136 - edge sealing portion; 137 - mounting hole; 138 - fastener; 1381 - head portion; 1382 - shaft portion; 139 - adhesive layer. DETAILED DESCRIPTION

[0084] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0085] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used herein are intended to cover a non-exclusive inclusion.

[0086] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0087] Reference herein to "embodiments" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0088] In the description of the embodiments of the present application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0089] In some high-power applications such as electric vehicles, the application of battery devices includes three levels: battery monomer, battery module, and battery device. The battery module is formed by electrically connecting a certain number of battery monomers together and placing them in a frame in order to protect the battery monomers from external impact, heat, vibration, etc. The battery device refers to the final state of the battery device system installed in the electric vehicle. The battery device referred to in the embodiments of the present application refers to a single physical module that includes one or more battery monomers to provide higher voltage and capacity. The battery device generally includes a box for packaging one or more battery monomers. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery monomers.

[0090] The battery device (Battery Apparatus) referred to in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery monomers connected in series, parallel, or mixed connection through busbar components.

[0091] In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery monomers; as an example, the battery cell assembly can be a battery module (Battery Module) formed by arranging and fixing a plurality of battery monomers into an independent module. As an example, the battery module can be formed by bundling a plurality of battery monomers with a cable tie.

[0092] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0093] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0094] As an example, the battery cell assembly can also be accommodated in the box by fixing a plurality of battery cells directly in the box.

[0095] In the following, the embodiments will mainly be described with respect to cuboid battery cells. It should be understood that the embodiments described in the following are also applicable to cylindrical battery cells or pouch battery cells or blade battery cells in some aspects.

[0096] In a general battery cell structure, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing includes an end cap and a case, and the end cap closes an opening of the case to define an accommodation space for accommodating the electrode assembly.

[0097] The development of battery technology needs to consider various design factors, such as performance parameters of energy density, cycle life, discharge capacity, and charge-discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0098] The outer side of the box of the battery device can be provided with a protective plate for weakening the impact force to resist the influence of external force impact on the battery cell. The protective plate generally has a buffer layer for energy absorption in collapse and an enhancement layer for improving the structural strength of the protective plate, and then forms a plate body through a fiber resin layer. Then the protective plate is arranged outside the box through fastening and other means. Generally, only the fiber resin layer is arranged at the position where the protective plate is connected with the box, and the risk of connection failure between the protective plate and the box is relatively high. Once the connection between the above two fails, the battery cell in the battery device loses external protection, and when external force acts on the box, the risk of excessive deformation of the battery cell is relatively high, and the reliability of the battery device is relatively poor.

[0099] In view of this, the battery device provided in the present application comprises a box body, a battery monomer and a protective plate, the battery monomer is arranged in the box body. The protective plate is arranged outside the box body, and the protective plate comprises a first fiber resin layer, a reinforcing layer, a buffer layer and a second fiber resin layer, the reinforcing layer and the buffer layer are located between the first fiber resin layer and the second fiber resin layer. The reinforcing layer comprises a first connecting part and a second connecting part, the first connecting part is connected with the first fiber resin layer and the second fiber resin layer, the second connecting part is connected with one of the first fiber resin layer and the second fiber resin layer, the buffer layer has a first surface and a second surface arranged oppositely along the thickness direction of the protective plate, the first surface is connected with the first fiber resin layer, and / or the second surface is connected with the second fiber resin layer. By arranging the first connecting part connected with the first fiber resin layer and the second fiber resin layer, the position of the protective plate provided with the first connecting part has high strength, the protective plate can be connected with the box body at the position, thereby facilitating to improve the connection stability of the protective plate and the box body. The second connecting part is connected with one of the first fiber resin layer and the second fiber resin layer, the protective plate can have high corrosion resistance and strong resistance to slight impact. The buffer layer can make the protective plate have a certain collapse energy absorption capacity, thereby reducing the risk that the impact force is transmitted to the inside of the box body to cause the battery monomer to be deformed excessively. At the same time, the first fiber resin layer and / or the second fiber resin layer can be closely combined with the buffer layer to form a relatively stable integrated structure, thereby improving the structural stability of the protective plate. In summary, the above battery device has high reliability.

[0100] The technical solutions described in the embodiments of the present application are suitable for battery monomers, battery devices and electric devices using the battery devices.

[0101] The electric device includes but is not limited to electric vehicles, electric vehicles, ships and spacecraft, etc., for example, the spacecraft includes airplanes, rockets, space shuttles and spaceships, etc.

[0102] The following embodiments are described for convenience with a vehicle 1000 as an example of an electric device in an embodiment of the present application.

[0103] For example, FIG. 1 is a structural schematic diagram of a vehicle 1000 according to 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 a range extended vehicle. The vehicle 1000 can be provided with a motor 300, a controller 200, and a battery device 100. The controller 200 is configured to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be configured to supply power to the vehicle 1000. For example, the battery device 100 can be configured as an operating power source of the vehicle 1000, and can be configured to supply power to the circuit system of the vehicle 1000, such as the power required for starting, navigation, and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 can be configured as an operating power source of the vehicle 1000, and can be configured to replace or partially replace fuel or natural gas to provide driving power to the vehicle 1000.

[0104] In order to meet different power requirements, the battery device 100 can include a plurality of battery cells 12. The plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner. The hybrid manner refers to a combination of series connection and parallel connection. The battery device 100 can also be referred to as a battery pack. Alternatively, the plurality of battery cells 12 can be connected in series, in parallel, or in a hybrid manner to form a battery module, and the plurality of battery modules can be connected in series, in parallel, or in a hybrid manner to form the battery device 100. That is, the plurality of battery cells 12 can be directly combined to form the battery device 100, or the plurality of battery cells 12 can be combined to form a battery module, and the battery module can be combined to form the battery device 100.

[0105] For example, please refer to FIG. 2, which is an exploded view of the battery device 100 according to some embodiments of the present application. The battery device 100 can include a plurality of battery cells 12. The battery device 100 can also include a box 11, which has a hollow structure, and the plurality of battery cells 12 can be accommodated in the box 11. As shown in FIG. 2, the first box 111 and the second box 112 are coupled together. The shapes of the first box 111 and the second box 112 can be determined according to the shape of the combination of the plurality of battery cells 12. The first box 111 and the second box 112 can each have an open surface. For example, the first box 111 and the second box 112 can each be a hollow cuboid and have only one surface as an open surface. The open surface of the first box 111 and the open surface of the second box 112 are arranged opposite to each other, and the first box 111 and the second box 112 are coupled to each other to form the box 11 having a closed cavity. The plurality of battery cells 12 can be combined in parallel, in series, or in a hybrid manner, and then placed in the box 11 formed by the coupling of the first box 111 and the second box 112.

[0106] Optionally, the battery device 100 can further include other structures, which will not be described herein. For example, the battery device 100 can further include a busbar component for realizing electrical connection between the plurality of battery cells 12, such as parallel connection or series connection or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 12 by connecting the electrode terminals of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals of the battery cells 12 by welding. The electrical energy of the plurality of battery cells 12 can be further led out through the box 11 by the conductive mechanism.

[0107] According to different power requirements, the number of battery cells 12 can be set to any value. The plurality of battery cells 12 can be connected in series, parallel or mixed connection to achieve larger capacity or power. Since the number of battery cells 12 included in each battery device 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery module. The number of battery cells 12 included in the battery module is not limited and can be set according to requirements. The battery device 100 can include a plurality of battery modules, and these battery modules can be connected in series, parallel or mixed connection.

[0108] According to some embodiments of the present application, referring to FIGS. 3-6, the present application provides a battery device 100, which includes a box 11, a battery cell 12 and a protective plate 13, the battery cell 12 is arranged in the box 11. The protective plate 13 is arranged outside the box 11, and the protective plate 13 includes a first fiber resin layer 131, a reinforcing layer 134, a buffer layer 133 and a second fiber resin layer 132, the reinforcing layer 134 and the buffer layer 133 are located between the first fiber resin layer 131 and the second fiber resin layer 132. Wherein, the reinforcing layer 134 includes a first connecting part 1341 and a second connecting part 1342, the first connecting part 1341 is connected with the first fiber resin layer 131 and the second fiber resin layer 132, the second connecting part 1342 is connected with one of the first fiber resin layer 131 and the second fiber resin layer 132, along the thickness direction of the protective plate 13, the buffer layer 133 has oppositely arranged first surface 1331 and second surface 1332, the first surface 1331 is connected with the first fiber resin layer 131, and / or the second surface 1332 is connected with the second fiber resin layer 132.

[0109] In some embodiments, the protective plate 13 can be arranged on any side of the outside of the box 11, such as the bottom, side, etc. of the box 11. Taking the electric device as a vehicle 1000 for example, the bottom of the box 11 can refer to the side of the box 11 close to the ground after the battery device 100 is installed to the vehicle 1000.

[0110] In some embodiments, the thickness direction of the protective plate 13 is parallel to the direction of gravity.

[0111] In some embodiments, the second fiber resin layer 132 is closer to the ground than the first fiber resin layer 131.

[0112] The first connecting portion 1341 can be connected to the first fiber resin layer 131 and the second fiber resin layer 132 by structural glue, or by the adhesive property of the resin part thereof.

[0113] In some embodiments, the material of the reinforcing layer 134 is metal.

[0114] The second fiber resin layer 132 can reduce the risk of the reinforcing layer 134 being exposed to the air and corroded by foreign matter scratching one side of the protective plate 13 in the thickness direction of the protective plate 13.

[0115] The second fiber resin layer 132 can distribute the impact load and reduce the risk of the impact force causing the battery monomer 12 inside the box body 11 to deform excessively before the impact force is transmitted to the box body 11.

[0116] In some embodiments, the first fiber resin layer 131 and the second fiber resin layer 132 can make the bottom protective plate have stronger fireproof ability, such as fiber resin composite material including carbon fiber, aramid fiber, or glass fiber.

[0117] In some embodiments, the first fiber resin layer 131 and / or the second fiber resin layer 132 cover the side of the reinforcing layer 134 in the second direction, and the second direction intersects the thickness direction of the protective plate 13.

[0118] In some embodiments, the protective plate 13 can be connected to the box body 11 by the fastener 138 passing through the first fiber resin layer 131, the second fiber resin layer 132, and the first connecting portion 1341. Since the fastener 138 passes through the first connecting portion 1341, the structural strength of the first connecting portion 1341 is relatively high, and the connection stability between the protective plate 13 and the box body 11 is relatively high. Similarly, in other embodiments, the protective plate 13 is connected to the box body 11 at the position where the first connecting portion 1341 is arranged, and both can make the connection stability between the protective plate 13 and the box body 11 relatively high. For example, riveting, resin adhesive connection, gluing, laser welding, hot pressing method, and the like. For example, composite connection by the above two ways.

[0119] One of the first fiber resin layer 131 or the second fiber resin layer 132 can play a role in preventing corrosion of the reinforcing layer 134, and the second connecting portion 1342 is connected by one of the first fiber resin layer 131 or the second fiber resin layer 132, and when the protective plate 13 is slightly impacted, the presence of the second connecting portion 1342 can make the protective plate 13 have substantially no excessive deformation, and still have a certain protective effect after being slightly impacted.

[0120] The first surface 1331 is connected with the first fiber resin layer 131, and / or the second surface 1332 is connected with the second fiber resin layer 132. This means that one side of the buffer layer 133 is connected with the fiber resin layer, and because the fiber resin layer itself has certain viscosity, such a setting makes the combination between each part of the protective plate 13 more compact.

[0121] In some embodiments, the tensile strength of the reinforcing layer 134 can be any value between greater than or equal to 200 MPa and less than or equal to 1000 MPa, for example, 200 MPa, 220 MPa, 240 MPa, 260 MPa, 280 MPa, 300 MPa, 320 MPa, 340 MPa, 360 MPa, 380 MPa, 400 MPa, 420 MPa, 440 MPa, 460 MPa, 480 MPa, 500 MPa, 520 MPa, 540 MPa, 560 MPa, 580 MPa, 600 MPa, 620 MPa, 640 MPa, 660 MPa, 680 MPa, 700 MPa, 720 MPa, 740 MPa, 760 MPa, 780 MPa, 800 MPa, 820 MPa, 840 MPa, 860 MPa, 880 MPa, 900 MPa, 920 MPa, 940 MPa, 960 MPa, 980 MPa, 1000 MPa, etc. The tensile strength of the reinforcing layer 134 can be determined according to “GBT 228.1-2021 Metallic Materials-Tensile Testing-Part 1: Method of Test at Room Temperature”.

[0122] In some embodiments, the tensile strength of the second fiber resin layer 132 can be any value between greater than or equal to 150 MPa and less than or equal to 600 MPa, for example, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, 200 MPa, 210 MPa, 220 MPa, 230 MPa, 240 MPa, 250 MPa, 260 MPa, 270 MPa, 280 MPa, 290 MPa, 300 MPa, 310 MPa, 320 MPa, 330 MPa, 340 MPa, 350 MPa, 360 MPa, 370 MPa, 380 MPa, 390 MPa, 400 MPa, 410 MPa, 420 MPa, 430 MPa, 440 MPa, 450 MPa, 460 MPa, 470 MPa, 480 MPa, 490 MPa, 500 MPa, 510 MPa, 520 MPa, 530 MPa, 540 MPa, 550 MPa, 560 MPa, 570 MPa, 580 MPa, 590 MPa, 600 MPa, or the like.

[0123] In some embodiments, the material of the second fiber resin layer 132 is a fiber resin composite material, and the tensile strength thereof can be determined according to the “GBT 1447-2005 Tensile Properties of Fiber Reinforced Plastics Test Method”.

[0124] In some embodiments, the tensile strength of the first fiber resin layer 131 can be any value between greater than or equal to 150 MPa and less than or equal to 600 MPa, for example, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, 200 MPa, 210 MPa, 220 MPa, 230 MPa, 240 MPa, 250 MPa, 260 MPa, 270 MPa, 280 MPa, 290 MPa, 300 MPa, 310 MPa, 320 MPa, 330 MPa, 340 MPa, 350 MPa, 360 MPa, 370 MPa, 380 MPa, 390 MPa, 400 MPa, 410 MPa, 420 MPa, 430 MPa, 440 MPa, 450 MPa, 460 MPa, 470 MPa, 480 MPa, 490 MPa, 500 MPa, 510 MPa, 520 MPa, 530 MPa, 540 MPa, 550 MPa, 560 MPa, 570 MPa, 580 MPa, 590 MPa, 600 MPa, or the like.

[0125] In some embodiments, the material of the first fiber resin layer 131 is a fiber resin composite material, and the tensile strength thereof can be determined according to the “GBT 1447-2005 Tensile Properties of Fiber Reinforced Plastics Test Method”.

[0126] In some embodiments, the compressive strength of the buffer layer 133 can be any value between greater than or equal to 1.5 MPa and less than or equal to 70 MPa, for example, 1.5 MPa, 10 MPa, 20 MPa, 30 MPa, 40 MPa, 50 MPa, 60 MPa, 70 MPa, etc.

[0127] In some cases, the compressive strength of the buffer layer 133 can be determined in accordance with the "GBT1453-2005 Interlayer Structure or Core Flat Compression Performance Test Method".

[0128] In the above scheme, by providing the first connecting portion 1341 connected to both the first fiber resin layer 131 and the second fiber resin layer 132, the position where the protective plate 13 is provided with the first connecting portion 1341 has high strength, and the protective plate 13 can be connected to the box body 11 at the position, thereby facilitating the connection stability of the protective plate 13 and the box body 11. The second connecting portion 1342 is connected to one of the first fiber resin layer 131 and the second fiber resin layer 132, and the protective plate 13 has high corrosion resistance and strong resistance to slight impact. The buffer layer 133 is provided to make the protective plate 13 have a certain collapse energy absorption capacity, thereby reducing the risk of the impact force being transmitted to the inside of the box body 11 to cause the battery monomer 12 to be deformed excessively. At the same time, the first fiber resin layer 131 and / or the second fiber resin layer 132 can be closely combined with the buffer layer 133 to form a relatively stable integrated structure, thereby improving the structural stability of the protective plate 13. In summary, the above battery device 100 has high reliability.

[0129] According to some embodiments of the present application, referring to FIG. 4, the first surface 1331 is connected to the first fiber resin layer 131, and the two sides of the second connecting portion 1342 are connected to the second surface 1332 and the second fiber resin layer 132, respectively.

[0130] In some embodiments, referring to FIG. 4, the part of the second connecting portion 1342 on one side is connected to the second surface 1332, the part of the second connecting portion 1342 on the other side is connected to the first fiber resin layer 131, and the other part of the second connecting portion 1342 on the other side is connected to the buffer layer 133.

[0131] In some embodiments, the second connecting portion 1342 protrudes in a direction away from the second fiber resin layer 132 relative to the first connecting portion 1341, the second connecting portion 1342 forms a second cavity with the second fiber resin layer 132, and the buffer layer 133 is arranged in the second cavity.

[0132] In the above scheme, the buffer layer 133 is connected to the first fiber resin layer 131 on one side and connected to the reinforcing member on the other side, so that the protective plate 13 has relatively light weight, and has relatively high strength, rigidity, structural stability and corrosion resistance. Since the reinforcing layer 134 is arranged on one side of the buffer layer 133, the risk of failure of the protective plate 13 under slight external force can be reduced, and the reliability of the battery device 100 can be improved.

[0133] According to some embodiments of the present application, referring to FIG. 4, the second connecting portion 1342 protrudes away from the first fiber resin layer 131 relative to the first connecting portion 1341, and the second connecting portion 1342 forms a first cavity with the first fiber resin layer 131, and the buffer layer 133 is arranged in the first cavity.

[0134] In some embodiments, the second connecting portion 1342 is a protruding portion protruding from the first connecting portion 1341, and a concave portion is formed on the side of the protruding portion away from the second fiber resin layer 132, and the concave portion forms the first cavity.

[0135] In the above scheme, part of the buffer layer 133 is accommodated in the cavity formed by the second connecting portion 1342 and the first fiber resin layer 131, so that the deformation range of the buffer layer 133 can be limited, and the risk of structural instability of the protective plate 13 and even failure of the connection between the protective plate 13 and the box body 11 due to excessive deformation of the buffer layer 133 can be reduced. At the same time, the risk of damage to the buffer layer 133 due to corrosion of foreign matter and deterioration of the energy absorption effect of the buffer layer 133 can be reduced.

[0136] According to some embodiments of the present application, referring to FIGS. 3 and 4, the second connecting portion 1342 is provided in plurality, and the plurality of second connecting portions 1342 are arranged at intervals, and the buffer layer 133 is provided in plurality, and the plurality of buffer layers 133 correspond one-to-one to the plurality of second connecting portions 1342.

[0137] In some embodiments, the plurality of second connecting portions 1342 can be simultaneously stamped by stamping processing.

[0138] In the above scheme, more areas of the protective plate 13 can have the ability to collapse and absorb energy, which is beneficial to further improve the reliability of the battery device 100.

[0139] According to some embodiments of the present application, referring to FIGS. 3 and 4, the second fiber resin layer 132 further includes a fourth connecting portion 1321 and a fifth connecting portion 1322, the fifth connecting portion 1322 protrudes away from the first fiber resin layer 131 relative to the fourth connecting portion 1321, the fourth connecting portion 1321 is connected to the first connecting portion 1341, and the fifth connecting portion 1322 is connected to the second connecting portion 1342.

[0140] In some embodiments, the first fiber resin layer 131 and the second fiber resin layer 132 can be respectively arranged on both sides of the reinforcing layer 134, and the protective plate 13 can be formed by one-time pressing of the upper and lower molds. After curing, cooling and other steps, the protective plate 13 can be taken out. At this time, different shaped molds can be customized according to requirements to process protective plates 13 suitable for different products. For example, the fifth connecting part 1322 protrudes away from the first fiber resin layer 131 relative to the fourth connecting part 1321. The fastener 138, the reinforcing frame and the like can be arranged around the fifth connecting part 1322 after the fifth connecting part 1322 protrudes.

[0141] In the above scheme, the protective plate 13 with the concave-convex configuration can be formed by the molding process.

[0142] According to some embodiments of the present application, referring to FIG. 5, the second surface 1332 is connected with the second fiber resin layer 132, and the reinforcing layer 134 includes a third connecting part 1343, and the two sides of the third connecting part 1343 are connected with the first surface 1331 and the first fiber resin layer 131 respectively.

[0143] In some embodiments, the third connecting part 1343 is arc transitioned with the first connecting part 1341, and the corresponding first fiber resin layer 131 covers the surface on one side of the reinforcing layer 134. In other embodiments, the third connecting part 1343 also protrudes relative to the first connecting part 1341, and the buffer layer 133 is provided with a groove for accommodating the third connecting part 1343. The first fiber resin layer 131 covers the inner surface of the groove.

[0144] In the above scheme, the buffer layer 133 can pre-absorb and disperse part of the external force, reduce the risk of excessive deformation of the reinforcing layer 134, and be beneficial to make the protective plate 13 still have high structural stability when subjected to external force.

[0145] According to some embodiments of the present application, referring to FIG. 5, the first connecting part 1341 and the third connecting part 1343 form a flat plate structure.

[0146] Since the first connecting part 1341 and the third connecting part 1343 form a flat plate structure, only the predetermined outer peripheral size and thickness need to be processed when processing the reinforcing layer 134, without the need for bending and stamping processes on the incoming material.

[0147] In the above scheme, the first connecting part 1341 and the third connecting part 1343 are processed into a flat plate structure, which can reduce the processing difficulty and cost.

[0148] According to some embodiments of the present application, referring to FIGS. 4-6, the protective plate 13 further includes a reinforcing piece 135, and the reinforcing piece 135 is located on the side of the fourth connecting part 1321 away from the first connecting part 1341.

[0149] In some embodiments, the reinforcing layer 134 has a convex portion, and the overall outer contour of the protective plate 13 can be plate-shaped by arranging the reinforcing member 135 around the convex portion, for example, as shown in FIG. 4. Such an arrangement can efficiently process the protective plate 13 through an extrusion process. Of course, when the fastener 138 passes through the reinforcing member 135, the connection strength of the protective plate 13 and the box 11 can also be improved.

[0150] The side of the reinforcing member 135 away from the fourth connecting portion 1321 is flush with the side of the fifth connecting portion 1322 away from the first fiber resin layer 131, which means that when an external force is transmitted to the side of the reinforcing member 135 away from the fourth connecting portion 1321, the external force can be more evenly spread, and the risk of stress concentration is lower.

[0151] In some embodiments, the material of the reinforcing member 135 is a fiber resin composite material, and its tensile strength can be determined according to “GBT 1447-2005 Fiber Reinforced Plastics Tensile Property Test Method”.

[0152] In some embodiments, the material of the reinforcing member 135 is metal, and its tensile strength can be determined according to “GBT 228.1-2021 Metallic Materials Tensile Test Part 1: Room Temperature Test Method”.

[0153] In some embodiments, the tensile strength of the reinforcing member 135 can be any value between greater than or equal to 200 MPa and less than or equal to 1000 MPa, for example, 200 MPa, 220 MPa, 240 MPa, 260 MPa, 280 MPa, 300 MPa, 320 MPa, 340 MPa, 360 MPa, 380 MPa, 400 MPa, 420 MPa, 440 MPa, 460 MPa, 480 MPa, 500 MPa, 520 MPa, 540 MPa, 560 MPa, 580 MPa, 600 MPa, 620 MPa, 640 MPa, 660 MPa, 680 MPa, 700 MPa, 720 MPa, 740 MPa, 760 MPa, 780 MPa, 800 MPa, 820 MPa, 840 MPa, 860 MPa, 880 MPa, 900 MPa, 920 MPa, 940 MPa, 960 MPa, 980 MPa, 1000 MPa, etc.

[0154] In the above scheme, the arrangement of the reinforcing member 135 can further enhance the structural strength of the position where the protective plate 13 is provided with the first connecting portion 1341, and at the same time, a flat plate-shaped protective plate 13 can be processed through an extrusion molding process, which is conducive to improving the production efficiency of the protective plate 13.

[0155] According to some embodiments of the present application, referring to FIGS. 4-6, the reinforcing member 135 is a frame structure, and the reinforcing member 135 is arranged around the fifth connecting portion 1322.

[0156] The specific shape of the reinforcing member 135 can be set according to the thickness, position, etc. of the buffer layer 133, for example, the shape of the reinforcing member 135 can include but is not limited to a rectangle, a circle, an arc, a U shape, etc.

[0157] In the above scheme, the frame-shaped reinforcing member 135 arranged around the fifth connecting portion 1322 can make the strength distribution of the protective plate 13 more uniform, and reduce the risk of stress concentration of the protective plate 13.

[0158] According to some embodiments of the present application, referring to FIGS. 4-6, the side of the reinforcing member 135 away from the fourth connecting portion 1321 is flush with the side of the fifth connecting portion 1322 away from the first fiber resin layer 131.

[0159] In the above scheme, it is beneficial to reduce the risk of stress concentration between the reinforcing member 135 and the second fiber resin layer 132.

[0160] According to some embodiments of the present application, the material of the reinforcing member 135 is independently selected from a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.

[0161] According to some embodiments of the present application, the reinforcing member 135 includes a plurality of layers of first fiber reinforced prepreg stacked on each other.

[0162] In the above scheme, while improving the strength and rigidity of the reinforcing member 135, the multi-layer structure helps to disperse stress and reduce stress concentration, thereby improving the fatigue resistance of the material.

[0163] According to some embodiments of the present application, referring to FIG. 4, along the thickness direction of the protective plate 13, the size of the reinforcing member 135 is H1, which satisfies: 5.5mm≤H1≤8mm.

[0164] Along the thickness direction of the protective plate 13, the size of the reinforcing member 135 can be any value greater than or equal to 5.5mm and less than or equal to 8mm, for example, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0165] In the above scheme, when H1 is greater than or equal to 5.5 mm, the reinforcing member 135 has sufficient thickness, which is beneficial to the protective plate 13 having high structural strength; when H1 is less than or equal to 8 mm, the reinforcing member 135 occupies a small space, and the battery device 100 has high energy density; therefore, when 5.5 mm≤H1≤8 mm, the protective plate 13 can have both high reliability and high energy density.

[0166] According to some embodiments of the present application, referring to FIGS. 3-6, the second fiber resin layer 132 includes a fourth connecting portion 1321 connected with the first connecting portion 1341, and the protective plate 13 is provided with a plurality of mounting holes 137 sequentially penetrating through the first fiber resin layer 131, the first connecting portion 1341 and the fourth connecting portion 1321.

[0167] The mounting hole 137 can be a light hole or a threaded hole.

[0168] In some embodiments, the mounting hole 137 is arranged around the buffer layer 133, that is, when a fastener 138 is arranged in the mounting hole 137, the fastener 138 does not contact the buffer layer 133, which is beneficial to the fastener 138 having high connection strength and the buffer layer 133 having high integrity and having a preset energy absorption capacity in collapse.

[0169] In the above scheme, since the mounting hole 137 penetrates through the first connecting portion 1341, the fastener 138 arranged in the mounting hole 137 has low risk of torque attenuation, which is beneficial to the protective plate 13 and the box body 11 having high connection stability.

[0170] According to some embodiments of the present application, referring to FIGS. 3-6, the second fiber resin layer 132 further includes a fifth connecting portion 1322 protruding away from the first fiber resin layer 131 relative to the fourth connecting portion 1321, and at least part of the normal projection of the buffer layer 133 is located in the normal projection of the fifth connecting portion 1322 in the same projection plane perpendicular to the thickness direction of the protective plate 13.

[0171] In some embodiments, the fifth connecting portion 1322 forms a cavity with the first fiber resin layer 131, and the buffer layer 133 is accommodated in the cavity; in other embodiments, the second connecting portion 1342 and the third connecting portion 1343 jointly define the cavity.

[0172] In the above scheme, when the protective plate 13 is subjected to an external force, the second fiber resin layer 132 and the buffer layer 133 can cooperate to absorb energy, which is beneficial to further improving the reliability of the battery device 100.

[0173] According to some embodiments of the present application, referring to FIG. 3 and FIG. 7, the fifth connecting part 1322 is provided in plurality, the plurality of fifth connecting parts 1322 are arranged at intervals, the buffer layer 133 is provided in plurality, the plurality of buffer layers 133 correspond to the plurality of fifth connecting parts 1322 one by one, and the partial mounting hole 137 is arranged between the adjacent two fifth connecting parts 1322.

[0174] Since the fifth connecting part 1322 protrudes from the fourth connecting part 1321, the partial mounting hole 137 is arranged between the adjacent two fifth connecting parts 1322, which means that the fastener 138 can share part of the space with the fifth connecting part 1322, and in some embodiments, it also means that the fastener 138 shares part of the space with the buffer layer 133.

[0175] In the above scheme, when the fastener 138 is arranged in the mounting hole 137, the fastener 138 can share part of the space with the buffer layer 133, which is beneficial to improve the energy density of the battery device 100.

[0176] According to some embodiments of the present application, referring to FIG. 3 and FIG. 7, the box body 11 includes a beam body 113, and in the same projection plane perpendicular to the thickness direction of the protective plate 13, the mounting hole 137 is located in the orthographic projection of the beam body 113.

[0177] The beam body 113 can include but is not limited to the side wall, cross beam, mounting beam, etc. of the box body 11.

[0178] The beam body 113 can be an inherent beam body 113 inside the box body 11 for separating the mounting space of the plurality of battery monomers 12.

[0179] In the above scheme, after the fastener 138 passes through the mounting hole 137 and is connected to the beam body 113, it does not occupy the space inside the box body 11 for arranging the battery monomer 12, which is beneficial to improve the energy density of the battery device 100. At the same time, the beam body 113 generally has higher structural strength compared with other wall parts of the box body 11, which is beneficial to improve the connection stability between the protective plate 13 and the box body 11.

[0180] According to some embodiments of the present application, referring to FIG. 3 and FIG. 7, the battery device 100 further includes a fastener 138, the fastener 138 includes a head part 1381 and a rod part 1382, the rod part 1382 passes through the mounting hole 137, and the head part 1381 is arranged on the side of the fourth connecting part 1321 away from the battery monomer 12, and in the thickness direction of the protective plate 13, the head part 1381 does not exceed the surface of the fifth connecting part 1322 away from the battery monomer 12.

[0181] The fastener 138 can be a self-tapping screw, a bolt and nut, a screw, a rivet, etc.

[0182] The number of fasteners 138 can be one or more.

[0183] The fastener 138 can pass through the box body 11 first and then pass through the first fiber resin layer 131, or pass through the first fiber resin layer 131 first and then enter the box body 11. For example, in some embodiments, the box body 11 includes a bottom plate and a frame, and the fastener 138 can be locked to the frame. In other embodiments, the box body 11 further includes a flange portion arranged around the frame, and the fastener 138 can pass through the flange portion to connect with the protective plate 13.

[0184] The material of the fastener 138 can be metal or non-metal. In embodiments where the material of the fastener 138 is metal, the material of the fastener 138 can include but is not limited to carbon steel, alloy steel, stainless steel, aluminum alloy, brass, etc. In embodiments where the material of the fastener 138 is non-metal, the material of the fastener 138 can include but is not limited to plastic, etc.

[0185] In the above scheme, since the head 1381 does not exceed the surface of the fifth connecting portion 1322 away from the battery monomer 12, the risk of external force directly acting on the fastener 138 is low, and the risk of damage to the fastener 138 is low, which is conducive to maintaining a relatively close connection between the protective plate 13 and the box body 11, thereby making the battery device 100 have higher structural stability and reliability.

[0186] According to some embodiments of the present application, please refer to FIG. 3 and FIG. 7, in the same projection plane perpendicular to the thickness direction of the protective plate 13, the front projection of the battery monomer 12 at least partially overlaps with the front projection of the fifth connecting portion 1322.

[0187] The front projection of the battery monomer 12 at least partially overlaps with the front projection of the fifth connecting portion 1322, which means that when the protective plate 13 is subjected to external force in the thickness direction, the force will first pass through the energy absorption of the collapse of the buffer layer 133 before being transmitted to the surrounding of the battery monomer 12.

[0188] In the above scheme, the external force will be dispersed through the fifth connecting portion 1322 and the buffer layer 133 before being transmitted to the battery monomer 12, which weakens the influence of the external force on the battery monomer 12 and improves the reliability of the battery device 100.

[0189] According to some embodiments of the present application, please refer to FIG. 3 and FIG. 7, the battery device 100 further includes a reinforcing member 135, the reinforcing member 135 is arranged on the side of the fourth connecting portion 1321 away from the first fiber resin layer 131, the reinforcing member 135 is arranged around the fifth connecting portion 1322, and the mounting hole 137 passes through the first fiber resin layer 131, the first connecting portion 1341, the fourth connecting portion 1321 and the reinforcing member 135 in sequence.

[0190] The fastener 138 can protrude from the reinforcing member 135 or can be partially accommodated in the reinforcing member 135, that is, in some embodiments, the head 1381 of the fastener 138 does not exceed the surface of the fifth connecting portion 1322 away from the battery cell 12, and does not exceed the surface of the reinforcing member 135 away from the battery cell 12.

[0191] In the above scheme, the mounting hole 137 passes through the first connecting portion 1341 and the reinforcing member 135, which can further reduce the risk of torque attenuation of the fastener 138 arranged in the mounting hole 137.

[0192] According to some embodiments of the present application, please refer to FIG. 3 and FIG. 7, the first fiber resin layer 131 is a flat plate structure, and the first fiber resin layer 131 is located on the side of the first connecting portion 1341 facing the box body 11.

[0193] Since the first fiber resin layer 131 is a flat plate structure, the connection between the first fiber resin layer 131 and the box body 11 is more convenient. If the box body 11 has a convex or concave part, a gasket can be easily added to realize the connection between the protective plate 13 and the box body 11.

[0194] In the above scheme, since the first fiber resin layer 131 is a flat plate structure, the first fiber resin layer 131 can uniformly distribute impact load, which is beneficial to reduce the risk of excessive deformation of part of the battery cells 12 in the box body 11.

[0195] According to some embodiments of the present application, please refer to FIG. 3-FIG. 7, the protective plate 13 further comprises an edge sealing portion 136, the reinforcing layer 134 has a third surface and a fourth surface opposite along the thickness direction thereof, and an outer peripheral surface connecting the third surface and the fourth surface, and the edge sealing portion 136 is wrapped on the outer peripheral surface and connects the first fiber resin layer 131 and the second fiber resin layer 132.

[0196] In some embodiments, the edge sealing portion 136 can be naturally formed by the first fiber resin layer 131 and / or the second fiber resin layer 132 under the action of external force during processing. In other embodiments, the edge sealing portion 136 can be subsequently injection molded.

[0197] In the above scheme, the arrangement of the edge sealing portion 136 can reduce the risk of corrosion of the exposed reinforcing layer 134, which is beneficial to improve the reliability of the battery device 100.

[0198] According to some embodiments of the present application, please refer to FIG. 3-FIG. 7, the material of the edge sealing portion 136 comprises resin.

[0199] The resin can include thermosetting resins, such as epoxy resin, phenolic resin, urea-formaldehyde resin, melamine resin, unsaturated polyester resin, silicone resin, polyurethane, etc.

[0200] The resin can include a thermoplastic resin, for example, polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.

[0201] Of course, the resin can also include, but is not limited to, polyamide, polyformaldehyde, polycarbonate, polyphenyl ether, polysulfone, rubber, etc.

[0202] According to some embodiments of the present application, referring to FIGS. 3-7, the size of the edge sealing portion 136 in the direction perpendicular to the outer circumferential surface is D, which satisfies: 1mm≤D≤10mm.

[0203] The size of the edge sealing portion 136 in the direction perpendicular to the outer circumferential surface can be any value greater than or equal to 1mm and less than or equal to 10mm, for example, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0204] In the above scheme, when D≥1mm, the risk of exposure of the reinforcing layer 134 can be reduced, and the battery device 100 has higher reliability; when D≤10mm, the edge sealing portion 136 occupies less space of the protective plate 13, and the structural strength of the protective plate 13 is higher; therefore, when 1mm≤D≤10mm, the risk of exposure of the reinforcing layer 134 is reduced, and the protective plate 13 has higher structural strength at the same time.

[0205] According to some embodiments of the present application, referring to FIG. 8, the protective plate 13 further includes a bonding layer, the first connecting portion 1341 is connected between the first fiber resin layer 131 and the second fiber resin layer 132 through the bonding layer, and the second connecting portion 1342 is bonded between the first fiber resin layer 131 through the bonding layer 139;

[0206] Or, the second connecting portion 1342 is bonded between the second fiber resin layer 132 through the bonding layer 139.

[0207] In some embodiments, the bonding layer 139 can be in a film shape, and is pre-laid to a specified position before the protective plate 13 is processed, and automatically realizes the effect of bonding two parts of the protective plate 13 in the process of molding or extrusion.

[0208] In the above scheme, by setting the bonding layer 139, the connection of each part of the protective plate 13 can be more compact, and the structure is more stable.

[0209] According to some embodiments of the present application, the bonding layer includes a resin film layer.

[0210] The material of the resin film layer can include a thermosetting resin, for example, epoxy resin, phenolic resin, urea-formaldehyde resin, melamine resin, unsaturated polyester resin, silicone resin polyurethane, etc.

[0211] The material of the resin film layer can include a thermoplastic resin, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.

[0212] Of course, the material of the resin film layer can also include, but is not limited to, polyamide, polyformaldehyde, polycarbonate, polyphenyl ether, polysulfone, rubber, etc.

[0213] According to some embodiments of the present application, referring to FIG. 8, the thickness of the bonding layer 139 is T, 0mm < T≤ 0.5mm.

[0214] The thickness of the bonding layer 139 can be any value between greater than 0mm and less than or equal to 0.5mm, such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm.

[0215] In the above scheme, when T>0mm, the bonding strength of each part of the protective plate 13 is higher, and the structural stability is stronger, so that the battery device 100 has higher reliability; when T≤0.5mm, the space occupied by the bonding layer 139 is smaller, and the energy density of the battery device 100 is higher; therefore, when 0mm < T≤ 0.5mm, the battery device 100 can have both high reliability and high energy density.

[0216] According to some embodiments of the present application, the first fiber resin layer 131 is independently selected from a glass fiber reinforced polyamide resin piece, a glass fiber reinforced polypropylene resin piece, a glass fiber reinforced polyethylene resin piece, a glass fiber reinforced polycarbonate resin piece, or a glass fiber reinforced polystyrene resin piece;

[0217] And / or, the second fiber resin layer 132 is independently selected from a glass fiber reinforced polyamide resin piece, a glass fiber reinforced polypropylene resin piece, a glass fiber reinforced polyethylene resin piece, a glass fiber reinforced polycarbonate resin piece, or a glass fiber reinforced polystyrene resin piece.

[0218] According to some embodiments of the present application, the first fiber resin layer 131 includes a plurality of layers of second fiber reinforced prepregs stacked with each other; and / or, the second fiber resin layer 132 includes a plurality of layers of third fiber reinforced prepregs stacked with each other.

[0219] In the above scheme, while improving the strength and rigidity of the protective plate 13, the multi-layer structure helps to disperse stress and reduce stress concentration, thereby improving the fatigue resistance of the material.

[0220] According to some embodiments of the present application, the material of the buffer layer 133 includes at least one of basswood, honeycomb, rubber, foamed material, and hard polyurethane.

[0221] According to some embodiments of the present application, the material of the reinforcing layer 134 comprises at least one of steel, titanium, ceramic and high-strength plastic.

[0222] According to some embodiments of the present application, referring to FIG. 4, the thickness of the second fiber resin layer 132 is H2, satisfying: 0.6mm≤H2≤2mm; and / or, the thickness of the first fiber resin layer 131 is H3, satisfying: 0.4mm≤H3≤1.5mm; and / or, the thickness of the reinforcing layer 134 is H4, satisfying: 0.3mm≤H4≤1.2mm.

[0223] The thickness of the first fiber resin layer 131 can be any value between greater than or equal to 0.6mm and less than or equal to 2mm, for example, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc.

[0224] The thickness of the reinforcing layer 134 can be any value between greater than or equal to 0.3mm and less than or equal to 1.2mm, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.

[0225] The thickness of the second fiber resin layer 132 can be any value between greater than or equal to 0.4mm and less than or equal to 1.5mm, for example, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.5mm, etc.

[0226] In the above scheme, when H2≥0.6mm, the second fiber resin layer 132 has a larger thickness and has a stronger ability to resist the impact of gravel; when H2≤2mm, the second fiber resin layer 132 occupies a smaller space, and the battery device 100 has a higher energy density; therefore, when 0.6mm≤H2≤2mm, the second fiber resin layer 132 has a stronger ability to resist the impact of gravel, and the battery device 100 also has a higher energy density.

[0227] When H3≥0.4mm, the first fiber resin layer 131 has a stronger ability to distribute load, which can weaken the impact force transmitted to the battery monomer 12; when H3≤1.5mm, the first fiber resin layer 131 occupies a smaller space, and the battery has a higher energy density; therefore, when 0.4mm≤H3≤1.5mm, the first fiber resin layer 131 has a stronger ability to distribute load, and the battery also has a higher energy density.

[0228] When H4≥0.3 mm, the reinforcing layer 134 has a larger thickness, and the structural strength of the protection plate 13 is higher; when H4≤1.2 mm, the reinforcing layer 134 occupies a smaller space, and the battery device 100 has a higher energy density; therefore, when 0.3 mm≤H4≤1.2 mm, the battery device 100 has both higher structural strength and energy density.

[0229] According to some embodiments of the present application, referring to FIG. 1, the present application provides a power consumption device, which includes the battery device 100 in one or more of the above embodiments, and the battery device 100 is used to provide electric energy.

[0230] In the above scheme, since the battery device 100 in one or more of the above embodiments has higher reliability, the power consumption device including the battery device 100 in one or more of the above embodiments also has higher reliability.

[0231] According to some embodiments of the present application, referring to FIGS. 3 and 4, the present application provides a battery device 100, which includes a box body 11, a battery cell 12, and a protection plate 13, and the battery cell 12 is arranged in the box body 11. The protection plate 13 is arranged outside the box body 11, and the protection plate 13 includes a first fiber resin layer 131, a reinforcing layer 134, a buffer layer 133, and a second fiber resin layer 132, and the reinforcing layer 134 and the buffer layer 133 are located between the first fiber resin layer 131 and the second fiber resin layer 132. The reinforcing layer 134 includes a first connecting portion 1341 and a second connecting portion 1342, the first connecting portion 1341 is connected with the first fiber resin layer 131 and the second fiber resin layer 132, and along the thickness direction of the protection plate 13, the buffer layer 133 has oppositely arranged first and second surfaces 1331 and 1332, and the first surface 1331 is connected with the first fiber resin layer 131. The second connecting portion 1342 is connected with the second surface 1332 and the second fiber resin layer 132 on both sides. The second connecting portion 1342 protrudes in a direction away from the first fiber resin layer 131 relative to the first connecting portion 1341, and the second connecting portion 1342 forms a first cavity with the first fiber resin layer 131, and the buffer layer 133 is arranged in the first cavity. The second connecting portion 1342 is provided in a plurality, and the plurality of second connecting portions 1342 are arranged at intervals, and the buffer layer 133 is provided in a plurality, and the plurality of buffer layers 133 correspond one-to-one to the plurality of second connecting portions 1342. The second fiber resin layer 132 further includes a fourth connecting portion 1321 and a fifth connecting portion 1322, the fifth connecting portion 1322 protrudes in a direction away from the first fiber resin layer 131 relative to the fourth connecting portion 1321, the fourth connecting portion 1321 is connected with the first connecting portion 1341, and the fifth connecting portion 1322 is connected with the second connecting portion 1342.

[0232] The protection plate 13 is provided with a plurality of mounting holes 137, the mounting holes 137 pass through the first fiber resin layer 131, the first connecting part 1341 and the fourth connecting part 1321 in sequence. In the same projection plane perpendicular to the thickness direction of the protection plate 13, at least part of the orthographic projection of the buffer layer 133 is located in the orthographic projection of the fifth connecting part 1322. The fifth connecting part 1322 is provided with a plurality of fifth connecting parts 1322, the plurality of fifth connecting parts 1322 are arranged at intervals, the buffer layer 133 is provided with a plurality of buffer layers 133, the plurality of buffer layers 133 correspond to the plurality of fifth connecting parts 1322 one by one, and part of the mounting hole 137 is arranged between the adjacent two fifth connecting parts 1322. The battery device 100 further comprises a fastener 138, the fastener 138 comprises a head part 1381 and a rod part 1382, the rod part 1382 is arranged in the mounting hole 137, the head part 1381 is arranged on the side of the fourth connecting part 1321 away from the battery monomer 12, and along the thickness direction of the protection plate 13, the head part 1381 does not exceed the surface of the fifth connecting part 1322 away from the battery monomer 12. In the same projection plane perpendicular to the thickness direction of the protection plate 13, the orthographic projection of the battery monomer 12 and the orthographic projection of the fifth connecting part 1322 at least partially overlap. The protection plate 13 further comprises an edge sealing part 136, the reinforcing layer 134 has a third surface and a fourth surface opposite along the thickness direction thereof, and an outer circumferential surface connecting the third surface and the fourth surface, and the edge sealing part 136 is wrapped on the outer circumferential surface and connects the first fiber resin layer 131 and the second fiber resin layer 132.

[0233] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery protection plate comprises a box body, a battery cell arranged in the box body, and a protection plate arranged outside the box body, wherein the protection plate comprises a first fiber resin layer, a reinforcing layer, a buffer layer, and a second fiber resin layer, the reinforcing layer and the buffer layer are arranged between the first fiber resin layer and the second fiber resin layer, the reinforcing layer comprises a first connecting portion and a second connecting portion, the first connecting portion is connected with the first fiber resin layer and the second fiber resin layer, the second connecting portion is connected with one of the first fiber resin layer and the second fiber resin layer, the buffer layer has a first surface and a second surface arranged oppositely along the thickness direction of the protection plate, the first surface is connected with the first fiber resin layer, and / or the second surface is connected with the second fiber resin layer. The first surface is connected with the first fiber resin layer, and the second connecting portion is connected with the second surface and the second fiber resin layer on both sides thereof. The second connecting portion protrudes away from the first fiber resin layer relative to the first connecting portion, and the second connecting portion and the first fiber resin layer form a first cavity, and the buffer layer is arranged in the first cavity. The second connecting portion is provided in a plurality of forms, and the buffer layer is provided in a plurality of forms, and the plurality of second connecting portions and the plurality of buffer layers correspond to each other. The second fiber resin layer further comprises a fourth connecting portion and a fifth connecting portion, the fifth connecting portion protrudes away from the first fiber resin layer relative to the fourth connecting portion, the fourth connecting portion is connected with the first connecting portion, and the fifth connecting portion is connected with the second connecting portion.

2. The battery device according to claim 1, characterized by The second surface is connected with the second fiber resin layer, and the reinforcing layer comprises a third connecting portion, and the third connecting portion is connected with the first surface and the first fiber resin layer on both sides thereof.

3. The battery device of claim 2, wherein, The first connecting portion and the third connecting portion form a flat plate structure.

4. The battery device of claim 3, wherein The second fiber resin layer comprises a fourth connecting portion and a fifth connecting portion, the fifth connecting portion protrudes away from the first fiber resin layer relative to the fourth connecting portion, the fourth connecting portion is connected with the first connecting portion, and the fifth connecting portion is connected with the second surface.

5. The battery device according to any one of claims 2 to 4, characterized by, The protection plate further comprises a reinforcing member, and the reinforcing member is arranged on the side of the fourth connecting portion away from the first connecting portion.

6. The battery device of claim 1, wherein The reinforcing member is in a frame structure, and the reinforcing member surrounds the fifth connecting portion.

7. The battery device of claim 6, wherein The side of the reinforcing member away from the fourth connecting portion is flush with the side of the fifth connecting portion away from the first fiber resin layer.

8. The battery device according to any one of claims 6-7, characterized in that, The material of the reinforcing member is independently selected from a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.

9. The battery device according to claim 5 or 8, characterized by The reinforcing member comprises a plurality of first fiber reinforced prepregs stacked on each other.

10. The battery device of claim 9, wherein, Along the thickness direction of the protection plate, the size of the reinforcing member is H1, and 5.5mm≤H1≤8mm is satisfied.

11. The battery device according to claim 9 or 10, characterized by ​ 12. The battery device according to any one of claims 9 to 11, characterized by, ​ 13. The battery device of any one of claims 9-12, wherein, ​ 14. The battery device of any one of claims 9-13, wherein, ​ 15. The battery device of any one of claims 1-14, wherein, The second fiber resin layer comprises a fourth connecting portion connected with the first connecting portion, and the protective plate is provided with a plurality of mounting holes sequentially penetrating through the first fiber resin layer, the first connecting portion and the fourth connecting portion.

16. The battery device of claim 15, wherein, The second fiber resin layer further comprises a fifth connecting portion protruding away from the first fiber resin layer relative to the fourth connecting portion, and at least part of the normal projection of the buffer layer is located in the normal projection of the fifth connecting portion in the same projection plane perpendicular to the thickness direction of the protective plate.

17. The battery device of claim 16, wherein, The fifth connecting portion is provided in plurality, and the buffer layer is provided in plurality corresponding to the fifth connecting portion, and part of the mounting holes are arranged between adjacent fifth connecting portions.

18. The battery device of claim 17, wherein, The box body comprises a beam body, and the mounting hole is located in the normal projection of the beam body in the same projection plane perpendicular to the thickness direction of the protective plate.

19. The battery device of any one of claims 16-18, wherein, The battery device further comprises a fastener comprising a head portion and a rod portion, the rod portion penetrating through the mounting hole, and the head portion being arranged on the side of the fourth connecting portion away from the battery monomer, and the head portion does not exceed the surface of the fifth connecting portion away from the battery monomer in the thickness direction of the protective plate.

20. The battery device of any one of claims 16-19, wherein, The normal projection of the battery monomer at least partially overlaps with the normal projection of the fifth connecting portion in the same projection plane perpendicular to the thickness direction of the protective plate.

21. The battery device of any one of claims 16-20, wherein, The battery device further comprises a reinforcing member arranged on the side of the fourth connecting portion away from the first fiber resin layer, and the reinforcing member is arranged around the fifth connecting portion, and the mounting hole sequentially penetrates through the first fiber resin layer, the first connecting portion, the fourth connecting portion and the reinforcing member.

22. The battery device of any one of claims 1-21, wherein, The first fiber resin layer is a flat plate structure, and the first fiber resin layer is located on the side of the first connecting portion facing the box body.

23. The battery device of any one of claims 1-22, wherein, The protective plate further comprises an edge sealing portion, the reinforcing layer has a third surface and a fourth surface opposite in the thickness direction thereof, and an outer peripheral surface connecting the third surface and the fourth surface, and the edge sealing portion is wrapped on the outer peripheral surface and connects the first fiber resin layer and the second fiber resin layer.

24. The battery device of claim 23, wherein, The material of the edge sealing portion comprises resin.

25. The battery device of claim 23 or 24, wherein, The size of the edge sealing portion in the direction perpendicular to the outer peripheral surface is D, which satisfies: 1mm≤D≤10mm.

26. The battery device of any one of claims 1-25, wherein, The protective plate further comprises a bonding layer, the first connecting portion is connected with the first fiber resin layer and the second fiber resin layer through the bonding layer, and the second connecting portion is bonded with the first fiber resin layer through the bonding layer. Or, the second connecting portion is bonded with the second fiber resin layer through the bonding layer.

27. The battery device of claim 26, wherein, The bonding layer comprises a resin film layer.

28. The battery device of claim 26 or 27, wherein, The thickness of the bonding layer is T, and 0mm 29. The battery device of any one of claims 1-28, wherein, The first fiber resin layer is independently selected from a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member or a glass fiber reinforced polystyrene resin member. And / or, the second fiber resin layer is independently selected from a glass fiber reinforced polyamide resin piece, a glass fiber reinforced polypropylene resin piece, a glass fiber reinforced polyethylene resin piece, a glass fiber reinforced polycarbonate resin piece, or a glass fiber reinforced polystyrene resin piece.

30. The battery device of any one of claims 1-29, wherein, The first fiber resin layer comprises a plurality of second fiber reinforced prepregs stacked with each other; And / or, the second fiber resin layer comprises a plurality of third fiber reinforced prepregs stacked with each other.

31. The battery device of any one of claims 1-30, wherein, The material of the buffer layer comprises at least one of basswood, honeycomb, rubber, foamed material and hard polyurethane.

32. The battery device of any one of claims 1-31, wherein, The material of the reinforcing layer comprises at least one of steel, titanium, ceramic and high-strength plastic.

33. The battery device of any one of claims 1-32, wherein, The thickness of the second fiber resin layer is H2, satisfying: 0.6mm≤H2≤2mm; And / or, the thickness of the first fiber resin layer is H3, satisfying: 0.4mm≤H3≤1.5mm; And / or, the thickness of the reinforcing layer is H4, satisfying: 0.3mm≤H4≤1.2mm.

34. An electrical device, comprising: The battery device as claimed in any one of claims 1-33 is used to provide electric energy.

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