Battery device and electric device

Abstract

The present application relates to the technical field of batteries. Disclosed are a battery device and an electric device. The battery device comprises a casing, battery cells, and a guard plate, wherein the battery cells are arranged in the casing. The guard plate comprises a first fiber resin layer, a second fiber resin layer, a buffer layer, and a reinforcing layer, wherein the buffer layer and the reinforcing layer are arranged between the first fiber resin layer and the second fiber resin layer, two sides of the reinforcing layer are respectively connected to the first fiber resin layer and the second fiber resin layer, the buffer layer has a first surface and a second surface which are opposite each other, and 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 above battery device has a high energy density.

Description

Battery devices and electrical appliances Cross-references to related applications

[0001] This application claims priority to Chinese Patent Application No. 202411045727.1, entitled “Battery Device and Power Consumption Device”, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery device and an electrical device. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] Improving the energy density of battery devices is a pressing issue in battery technology. Summary of the Invention

[0005] In view of the above problems, this application provides a battery device and an electrical device that can improve the energy density of the battery device.

[0006] In a first aspect, this application provides a battery device, which includes a housing, a battery cell, and a protective plate, wherein the battery cell is disposed within the housing. The protective plate includes a first fiber resin layer, a second fiber resin layer, a buffer layer, and a reinforcing layer, wherein the buffer layer and the reinforcing layer are disposed between the first fiber resin layer and the second fiber resin layer, and both sides of the reinforcing layer are respectively connected to the first fiber resin layer and the second fiber resin layer. The buffer layer has a first surface and a second surface facing 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.

[0007] In the technical solution of this application embodiment, since the two sides of the reinforcing layer are respectively connected to the first fiber resin layer and the second fiber resin layer, the protective plate is enhanced with higher strength, which is beneficial to the connection stability of the protective plate after it is connected to the housing. Simultaneously, the first fiber resin layer and / or the second fiber resin layer can be tightly bonded to the buffer layer, forming a relatively stable integrated structure, thereby improving the structural stability of the protective plate. Furthermore, since the reinforcing layer is connected to the first and second fiber resin layers, and the buffer layer is connected to the first and / or the second fiber resin layers, the reinforcing layer and the buffer layer share some space, resulting in a higher energy density for the battery device. In summary, the above-mentioned battery device can achieve both high energy density and 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 surface is connected to the second fiber resin layer.

[0009] In the above scheme, the two sides of the buffer layer are connected to the first fiber resin layer and the second fiber resin layer respectively, which can make the first fiber resin layer, the second fiber resin layer and the buffer layer more tightly bonded together, giving the protective plate higher structural stability.

[0010] In one or more embodiments of the first aspect, the first fiber resin layer is located on the side of the reinforcing layer facing the battery cell, a first gap is provided between the first surface and the first fiber resin layer, and the second surface is connected to the second fiber resin layer.

[0011] In the above scheme, due to the presence of the first gap, the buffer layer has a larger deformation space after the external force is transmitted to it, which is beneficial to improving the energy absorption effect of the buffer layer in case of collapse. At the same time, the buffer layer will deform towards the first gap, so the risk of the structural stability of the protective plate being reduced due to deformation of the buffer layer in all directions is low.

[0012] In one or more embodiments of the first aspect, the first fiber resin layer is located on the side of the reinforcing layer facing the battery cell, the first surface is connected to the first fiber resin layer, and a second gap is provided between the second surface and the second fiber resin layer.

[0013] In the above scheme, due to the existence of the second gap, after the external force is applied to the second fiber resin layer, it will be preferentially transmitted to the reinforcing layer. When the external force is relatively small, the protective plate will not deform excessively, and the protective plate and the box will still maintain a relatively stable connection.

[0014] In one or more embodiments of the first aspect, multiple buffer layers are provided, the multiple buffer layers are spaced apart, and an enhancement layer is provided between two adjacent buffer layers.

[0015] In the above scheme, the reinforcement layer can limit the deformation range of the buffer layer, reducing the risk of structural instability of the protective plate due to excessive deformation of the buffer layer, or even failure of the connection with the box.

[0016] In one or more embodiments of the first aspect, the reinforcing layer includes a reinforcing strip, the battery device includes at least one battery cell assembly, the battery cell assembly includes a plurality of battery cells stacked along a first direction, the first direction being perpendicular to the large surface of the battery cells, and the reinforcing strip extends along the first direction.

[0017] In the above scheme, the extension direction of the reinforcing strip is consistent with the arrangement direction of multiple battery cells in the same battery cell assembly, which simplifies the assembly difficulty of the protective plate.

[0018] In one or more embodiments of the first aspect, the orthographic projection of the reinforcing strip at least partially overlaps with the orthographic projection of the battery cell assembly in the same projection plane perpendicular to the thickness direction of the protective plate.

[0019] In the above scheme, the impact load brought by external force can be evenly distributed and discharged by the reinforcing strips before being transferred to the battery cell assembly, which reduces the risk of excessive deformation of the battery cell and helps to improve the reliability of the battery device.

[0020] In one or more embodiments of the first aspect, the battery cell has two opposite sides along a second direction, and the second direction, the first direction, and the thickness direction of the protective plate are perpendicular to each other. Reinforcing strips are respectively provided on the protective plate at positions corresponding to the sides, and in the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projections of the same side of multiple battery cells in the battery cell assembly at least partially overlap with the orthographic projection of the same reinforcing strip.

[0021] In the above scheme, the external force will first be transmitted to the side of the battery cell with higher structural strength, which helps to reduce the risk of excessive deformation of the battery cell.

[0022] In one or more embodiments of the first aspect, a plurality of battery cell assemblies are provided, and the plurality of battery cell assemblies are arranged along the second direction. In the same projection plane along the thickness direction of the protective plate, the orthographic projection of two adjacent battery cell assemblies at least partially overlaps with the orthographic projection of the same reinforcing strip.

[0023] In the above scheme, since the orthographic projections of two adjacent battery cell modules overlap at least partially with the orthographic projections of the same reinforcing strip, the external force, after being transmitted to the inside of the housing by the reinforcing strip, will be distributed by the side with higher structural strength in the battery cell of the two adjacent battery cell modules, further reducing the risk of excessive deformation of a certain battery cell in the same battery cell module.

[0024] In one or more embodiments of the first aspect, the reinforcing layer is a reinforcing plate, and the buffer layer includes a first buffer layer and a second buffer layer. The first buffer layer, the reinforcing plate, and the second buffer layer are arranged along a first direction, which intersects with the thickness direction of the protective plate.

[0025] In the above scheme, the reinforcement plate can improve the structural strength of the protective plate, and the first and second buffers can enable the protective plate to have a certain ability to collapse and absorb energy when it is impacted on one side of its thickness direction. This can reduce the risk of the impact force being transmitted to the inside of the box and causing excessive deformation of the battery cells, weaken the impact force on the battery cells, and improve the reliability of the battery.

[0026] In one or more embodiments of the first aspect, at least a portion of the orthographic projection of the battery cell overlaps with the orthographic projection of the reinforcing plate in the same projection plane perpendicular to the thickness direction of the protective plate.

[0027] In the above scheme, since at least part of the orthographic projection of the battery cell overlaps with the orthographic projection of the reinforcing plate, the external force is only transmitted to the battery cell after being dispersed by the reinforcing plate, which reduces the risk of excessive deformation of the battery cell caused by excessive external force acting directly on it.

[0028] In one or more embodiments of the first aspect, at least one end of the reinforcing plate protrudes from the first buffer layer and the second buffer layer along the second direction, and the first direction, the second direction and the thickness direction of the protective plate are perpendicular to each other.

[0029] In the above scheme, when the two sides of the protective plate are impacted along the second direction, the impact force will be transmitted to the reinforcement first. Since the reinforcement has high structural strength, the risk of excessive deformation of the protective plate is low, thereby further improving the battery's ability to resist external impacts in the second direction.

[0030] In one or more embodiments of the first aspect, the protective plate further includes an edge sealing portion, the reinforcing layer has a third surface and a fourth surface opposite to each other along its thickness direction, and an outer peripheral surface connecting the third surface and the fourth surface, the buffer layer covers a portion of the outer peripheral surface, the edge sealing portion covers the remaining outer peripheral surface, and the edge sealing portion connects the first fiber resin layer and the second fiber resin layer.

[0031] In the above scheme, the sealing edge can reduce the risk of corrosion of the exposed reinforcement layer, which is beneficial to improving the reliability of the battery device.

[0032] In one or more embodiments of the first aspect, the first fiber resin layer is located on the side of the second fiber resin layer facing the housing, the second fiber resin layer includes a fourth connecting portion and a fifth connecting portion, the fifth connecting portion protrudes relative to the fourth connecting portion in a direction away from the first fiber resin layer, the fourth connecting portion is connected to the first fiber resin layer, and the fifth connecting portion is connected to at least one of the buffer layer and the reinforcing layer.

[0033] In the above solution, a protective plate with a concave-convex structure can be formed by molding.

[0034] In one or more embodiments of the first aspect, the reinforcing layer has a through-hole extending along its thickness direction, and a buffer layer is disposed within the through-hole.

[0035] In the above scheme, the through holes can pre-position the buffer layer, reducing the assembly difficulty of the protective plate.

[0036] In one or more embodiments of the first aspect, the second fiber resin layer includes a fourth connecting portion and a fifth connecting portion, the fifth connecting portion protruding relative to the fourth connecting portion in a direction away from the first fiber resin layer, the fourth connecting portion being connected to the reinforcing layer, and the fifth connecting portion being connected to the buffer layer.

[0037] In the above scheme, the protective plate with a buffer layer inside the through hole can also be formed by molding process.

[0038] In one or more embodiments of the first aspect, the protective plate further includes a reinforcing member located on the side of the fourth connection portion opposite to the first fiber resin layer.

[0039] In the above scheme, the addition of reinforcing components can further enhance the structural strength of the protective plate. At the same time, the protective plate can be processed into a flat plate through extrusion molding, which is beneficial to improving the production efficiency of the protective plate.

[0040] In one or more embodiments of the first aspect, the side of the reinforcing member opposite to the fourth connecting portion is flush with the side of the fifth connecting portion opposite to the first fiber resin layer.

[0041] The above solution helps reduce the risk of stress concentration between the reinforcing member and the second fiber resin layer.

[0042] In one or more embodiments of the first aspect, the protective plate is provided with a first mounting hole, which passes through the first fiber resin layer, the fourth connecting portion and the reinforcing member in sequence.

[0043] In the above solution, the mounting hole passes through the reinforcement, which can reduce the risk of torque decay of the fasteners installed in the mounting hole.

[0044] In one or more embodiments of the first aspect, the reinforcing member is disposed around the fifth connecting portion.

[0045] In the above scheme, the reinforcing member and the fifth connecting part share a portion of the space, which is beneficial to improving the energy density of the battery device.

[0046] In one or more embodiments of the first aspect, the material of the reinforcing member is independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin, or glass fiber reinforced polystyrene resin.

[0047] In one or more embodiments of the first aspect, the reinforcing member comprises multiple layers of first fiber-reinforced prepreg.

[0048] In the above scheme, while improving the strength and stiffness of the reinforcing member, the multi-layer structure helps to disperse stress and reduce stress concentration, thereby improving the fatigue resistance of the material.

[0049] In one or more embodiments of the first aspect, the protective plate is provided with a plurality of second mounting holes, which pass through the first fiber resin layer and the fourth connecting portion in sequence.

[0050] The above solution reduces the assembly difficulty of the fasteners located in the second mounting hole.

[0051] In one or more embodiments of the first aspect, a plurality of fifth connecting portions are provided, the plurality of fifth connecting portions are spaced apart, a plurality of buffer layers are provided, the plurality of buffer layers correspond one-to-one with the plurality of fifth connecting portions, and a portion of the second mounting holes are provided between two adjacent fifth connecting portions.

[0052] In the above scheme, the fastener set in the second mounting hole can share part of the space with the fifth connecting part, which is beneficial to improving the energy density of the battery device.

[0053] In one or more embodiments of the first aspect, the housing includes a beam, and the second mounting hole is located within the orthographic projection of the beam in the same projection plane perpendicular to the thickness direction of the protective plate.

[0054] In the above scheme, the fasteners, after passing through the mounting holes and connecting to the beam, do not occupy the space inside the housing used for arranging individual battery cells, which is beneficial to improving the energy density of the battery device. At the same time, the beam generally has higher structural strength than other walls of the housing, which helps improve the connection stability between the protective plate and the housing.

[0055] In one or more embodiments of the first aspect, the battery device further includes a fastener, the fastener including a head and a rod, the rod having a second mounting hole, the head being positioned on the side of the fourth connection away from the battery cell, and the head not extending beyond the surface of the fifth connection away from the battery cell along the thickness direction of the protective plate.

[0056] In the above scheme, since the head does not extend beyond the surface of the fifth connection part away from the battery cell, the risk of external force acting directly on the fastener is low, and the risk of fastener damage is low. This is conducive to maintaining a tighter connection between the protective plate and the housing, thereby enabling the battery device to have higher structural stability and reliability.

[0057] In one or more embodiments of the first aspect, the protective plate further includes an edge sealing portion, the reinforcing layer having a third surface and a fourth surface opposite to each other along its thickness direction, and an outer peripheral surface connecting the third surface and the fourth surface, the edge sealing portion covering the outer peripheral surface and connecting the first fiber resin layer and the second fiber resin layer.

[0058] In the above solution, the edge sealing can reduce the risk of corrosion caused by exposed reinforcement.

[0059] In one or more embodiments of the first aspect, the edge sealing material includes resin.

[0060] In one or more embodiments of the first aspect, the dimension of the sealing portion in the direction perpendicular to the outer peripheral surface is D, satisfying: 1mm≤D≤10mm.

[0061] In the above scheme, when D≥1mm, the risk of exposed reinforcement layer can be reduced, and the battery device can have higher reliability; when D≤10mm, the space occupied by the sealing part of the protective plate is small, and the structural strength of the protective plate is high; therefore, when 1mm≤D≤10mm, the risk of exposed reinforcement layer can be reduced while the protective plate can also have high structural strength.

[0062] In one or more embodiments of the first aspect, the protective plate further includes an adhesive layer, wherein the first fiber resin layer and the reinforcing layer are bonded together by the adhesive layer; and / or, the second fiber resin layer and the reinforcing layer are bonded together by the adhesive layer.

[0063] In the above scheme, the bonding layer can make the connection between the various parts of the protective plate tighter and the structure more stable.

[0064] In one or more embodiments of the first aspect, the adhesive layer includes a resin film layer.

[0065] In one or more embodiments of the first aspect, the thickness of the adhesive layer is T, where 0 mm < T ≤ 0.5 mm.

[0066] In the above scheme, when T > 0 mm, the bonding 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 bonding 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 balance high reliability and energy density.

[0067] In one or more embodiments of the first aspect, the first fiber resin layer is independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin, or glass fiber reinforced polystyrene resin; and / or, the second fiber resin layer is independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin, or glass fiber reinforced polystyrene resin.

[0068] In one or more embodiments of the first aspect, the first fiber resin layer comprises multiple layers of second fiber-reinforced prepreg; and / or, the second fiber resin layer comprises multiple layers of third fiber-reinforced prepreg.

[0069] 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.

[0070] In one or more embodiments of the first aspect, the material of the buffer layer includes at least one of balsa wood, honeycomb, rubber, foam material and rigid polyurethane.

[0071] In one or more embodiments of the first aspect, the reinforcing layer is made of at least one of steel, titanium, ceramic, and high-strength plastic.

[0072] In one or more embodiments of the first aspect, 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.

[0073] In the above scheme, when H2≥0.6mm, the second fiber resin layer has a large thickness and a strong ability to resist the impact of gravel; when H2≤2mm, the space occupied by the second fiber resin layer is small, and the battery device has a high energy density; therefore, when 0.6mm≤H2≤2mm, while the second fiber resin layer has a strong ability to resist the impact of gravel, the battery device can also have a high energy density.

[0074] When H3 ≥ 0.4 mm, the first fiber resin layer has a strong ability to uniformly distribute load, which can weaken the impact force transmitted to the battery cell; when H3 ≤ 1.5 mm, the space occupied by the first fiber resin layer is small, and the battery has a high energy density; therefore, when 0.4 mm ≤ H3 ≤ 1.5 mm, the first fiber resin layer has a strong ability to uniformly distribute load, and the battery can also have a high energy density.

[0075] When H4 ≥ 0.3 mm, the reinforcing layer has a large thickness, and the protective plate has high structural strength; when H4 ≤ 1.2 mm, the reinforcing layer occupies less space, and the battery device has high energy density; therefore, when 0.3 mm ≤ H4 ≤ 1.2 mm, the battery device can balance high structural strength and energy density.

[0076] Secondly, this application provides an electrical device that includes the battery device in one or more embodiments of the first aspect, the battery device being used to provide electrical energy.

[0077] In the above solution, since the battery device in one or more embodiments of the first aspect has high reliability, the power supply device including the battery device in one or more embodiments of the first aspect also has high reliability.

[0078] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0079] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0080] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0081] Figure 2 is an exploded view of a battery device according to some embodiments of this application;

[0082] Figure 3 is a cross-sectional view of a protective plate according to some embodiments of this application;

[0083] Figure 4 is a schematic diagram of a portion of the structure of the protective plate according to some embodiments of this application;

[0084] Figure 5 is a cross-sectional view of a protective plate according to some embodiments of this application;

[0085] Figure 6 is a schematic diagram of a portion of the structure of the protective plate according to some embodiments of this application;

[0086] Figure 7 is an exploded view of the protective plate of some embodiments of this application;

[0087] Figure 8 is a cross-sectional view of the protective plate according to some other embodiments of this application;

[0088] Figure 9 is a schematic diagram of a portion of the structure of the protective plate according to some other embodiments of this application;

[0089] Figure 10 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0090] Figure 11 is a cross-sectional view of a partial structure of a battery device according to some other embodiments of this application;

[0091] Figure 12 is an exploded view of a battery device according to some other embodiments of this application;

[0092] Figure 13 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application.

[0093] The reference numerals in the detailed embodiments are as follows:

[0094] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 113 - Beam; 12 - Battery Cell; 121 - Side; 13 - Protective Plate; 131 - First Fiber Resin Layer; 132 - Second Fiber Resin Layer; 1321 - Fourth Connecting Part; 1322 - Fifth Connecting Part; 133 - Buffer Layer; 1331 - First Surface; 1332 - Second Surface; 1333 - First Buffer Layer; 1334 - Second Buffer Layer; 134 - Reinforcing Layer; 135 - Reinforcing Member; 136 - Edge Sealing Part; 137 - First Mounting Hole; 138 - Fastener; 1381 - Head; 1382 - Rod Part; 139 - Adhesive Layer; 140 - Second Mounting Hole; X - First Direction; Y - Second Direction. Detailed Implementation

[0095] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0096] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0097] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0098] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0099] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0100] In high-power applications such as electric vehicles, battery devices are used at three levels: individual battery cells, battery modules, and battery packs. A battery module is formed by electrically connecting a number of individual battery cells and placing them in a frame to protect them from external shocks, heat, and vibration. A battery pack refers to the final state of the battery system installed in an electric vehicle. The battery pack mentioned in the embodiments of this application refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. A battery pack generally includes a housing for encapsulating one or more individual battery cells. The housing reduces the risk of liquids or other foreign matter affecting the charging or discharging of the individual battery cells.

[0101] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0102] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0103] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0104] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0105] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0106] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0107] In a typical battery cell structure, a battery cell includes a casing, electrode assemblies, and electrolyte. The casing includes end caps and a housing; the end caps close the openings of the housing to define a space for accommodating the electrode assemblies.

[0108] The development of battery technology must take into account multiple design factors, such as reliability, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the energy density of the battery device also needs to be considered.

[0109] The outer side of the battery pack casing is fitted with a protective plate to mitigate impact forces and protect the individual battery cells from damage. The protective plate typically includes a cushioning layer for energy absorption during collapse and a reinforcing layer to enhance its structural strength, all encased in a fiber resin layer to form a single plate. The typical stacked reinforcement and cushioning layers of the protective plate consume excessive space, resulting in a lower energy density for the battery pack.

[0110] In view of this, this application provides a battery device, which includes a housing, a battery cell, and a protective plate, with the battery cell disposed within the housing. The protective plate includes a first fiber resin layer, a second fiber resin layer, a buffer layer, and a reinforcing layer, with the buffer layer and the reinforcing layer positioned between the first and second fiber resin layers. The two sides of the reinforcing layer are respectively connected to the first and second fiber resin layers. The buffer layer has opposing first and second surfaces, with the first surface connected to the first fiber resin layer and / or the second surface connected to the second fiber resin layer. Because the reinforcing layer is connected to the first and second fiber resin layers, and the buffer layer is connected to the first and / or second fiber resin layers, the reinforcing layer and the buffer layer share some space, resulting in a higher energy density for the battery device.

[0111] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0112] Electrical devices include, but are not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0113] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0114] For example, Figure 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a fuel-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may have a motor 300, a controller 200, and a battery device 100 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0115] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or in a mixed configuration. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 12 can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules can be connected in series, parallel, or in a mixed configuration to form the battery device 100. That is, the multiple battery cells 12 can directly form the battery device 100, or they can first be formed into battery modules, and then the battery modules can be combined to form the battery device 100.

[0116] For example, please refer to Figure 2, which is an exploded view of a battery device 100 according to some embodiments of this application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may also include a housing 11, which has a hollow internal structure, and the plurality of battery cells 12 are housed within the housing 11. As shown in Figure 2, these are referred to here as a first housing 111 and a second housing 112, which are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the shape of the combination of the plurality of battery cells 12. Both the first housing 111 and the second housing 112 may have an open surface. For example, both the first housing 111 and the second housing 112 may be hollow cuboids with only one open surface each. The open surfaces of the first housing 111 and the second housing 112 are arranged opposite to each other, and the first housing 111 and the second housing 112 are fastened together to form a housing 11 with a closed cavity. Multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the first housing 111 and the second housing 112 being fastened together.

[0117] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar component can realize electrical connection between 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 multiple battery cells 12 can be further led out through the housing 11 via a conductive mechanism.

[0118] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery module. The number of battery cells 12 included in a battery module is unlimited and can be set according to requirements. The battery device 100 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0119] According to some embodiments of this application, referring to Figures 3-9, this application provides a battery device 100. The battery device 100 includes a housing 11, a battery cell 12, and a protective plate 13. The battery cell 12 is disposed within the housing 11. The protective plate 13 includes a first fiber resin layer 131, a second fiber resin layer 132, a buffer layer 133, and a reinforcing layer 134. The buffer layer 133 and the reinforcing layer 134 are disposed between the first fiber resin layer 131 and the second fiber resin layer 132. The two sides of the reinforcing layer 134 are respectively connected to the first fiber resin layer 131 and the second fiber resin layer 132. The buffer layer 133 has a first surface 1331 and a second surface 1332 facing each other. The first surface 1331 is connected to the first fiber resin layer 131, and / or the second surface 1332 is connected to the second fiber resin layer 132.

[0120] In some embodiments, the protective plate 13 may be disposed on any side of the exterior of the housing 11, such as the bottom or side 121 of the housing 11. Taking the vehicle 1000 as an example, the bottom of the housing 11 may refer to the side of the housing 11 closest to the ground after the battery device 100 is installed in the vehicle 1000.

[0121] In some embodiments, the thickness direction of the protective plate 13 is parallel to the direction of gravity.

[0122] In some embodiments, the second fiber resin layer 132 is closer to the ground than the first fiber resin layer 131.

[0123] The reinforcing layer 134 can be connected to the first fiber resin layer 131 and the second fiber resin layer 132 by structural adhesive or by the adhesive properties of their resin portions.

[0124] In some embodiments, the reinforcing layer 134 is made of metal.

[0125] The provision of the second fiber resin layer 132 can reduce the risk that the reinforcing layer 134 will be exposed to air or other environments and corroded due to foreign objects scraping one side of the protective plate 13 in the thickness direction.

[0126] Before the impact force is transmitted from the first fiber resin layer 131 to the reinforcing layer 134 and before it is transmitted to the housing 11, the second fiber resin layer 132 can evenly distribute the impact load and reduce the risk of excessive deformation of the battery cells 12 inside the housing 11 due to the impact force.

[0127] In some embodiments, the provision of the first fiber resin layer 131 and the second fiber resin layer 132 can enable the bottom protective plate to have strong fire resistance, for example, a fiber resin composite material including fibers such as carbon fiber, aramid fiber or glass fiber.

[0128] In some embodiments, the first fiber resin layer 131 and / or the second fiber resin layer 132 cover the reinforcing layer 134 on the side 121 of the second direction Y, which intersects the thickness direction of the protective plate 13.

[0129] Since the reinforcing layer 134 is connected to the first fiber resin layer 131 and the second fiber resin layer 132 on both sides, and the buffer layer 133 has a first surface 1331 and a second surface 1332 opposite to each other, the first surface 1331 is connected to the first fiber resin layer 131, and / or the second surface 1332 is connected to the second fiber resin layer 132, it means that the reinforcing layer 134 and the buffer layer 133 will share part of the space, and the energy density of the battery device 100 is high.

[0130] The first surface 1331 is connected to the first fiber resin layer 131, and / or the second surface 1332 is connected to the second fiber resin layer 132. This means that one side of the buffer layer 133 is connected to the fiber resin layer. Since the fiber resin layer itself has a certain degree of adhesion, this arrangement makes the bonding between the various parts of the protective plate 13 tighter.

[0131] In some embodiments, the tensile strength of the reinforcing layer 134 can be any value between 200 MPa and 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, and 520 MPa. The tensile strengths are 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, and 1000 MPa, etc. The tensile strength of the reinforcing layer 134 can be determined according to GB / T 228.1-2021 Metallic Materials - Tensile Testing - Part 1: Test at Room Temperature.

[0132] In some embodiments, the tensile strength of the second fiber resin layer 132 can be any value between 150 MPa and 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. 340MPa, 350MPa, 360MPa, 370MPa, 380MPa, 390MPa, 400MPa, 410MPa, 420MPa, 430MPa, 440MPa, 450MPa, 460MPa, 470M Pa, 480MPa, 490MPa, 500MPa, 510MPa, 520MPa, 530MPa, 540MPa, 550MPa, 560MPa, 570MPa, 580MPa, 590MPa, 600MPa, etc.

[0133] In some embodiments, the second fiber resin layer 132 is made of fiber resin composite material, and its tensile strength can be determined with reference to GB / T 1447-2005 Test Method for Tensile Properties of Fiber Reinforced Plastics.

[0134] In some embodiments, the tensile strength of the first fiber resin layer 131 can be any value between 150 MPa and 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. 340MPa, 350MPa, 360MPa, 370MPa, 380MPa, 390MPa, 400MPa, 410MPa, 420MPa, 430MPa, 440MPa, 450MPa, 460MPa, 470M Pa, 480MPa, 490MPa, 500MPa, 510MPa, 520MPa, 530MPa, 540MPa, 550MPa, 560MPa, 570MPa, 580MPa, 590MPa, 600MPa, etc.

[0135] In some embodiments, the first fiber resin layer 131 is made of fiber resin composite material, and its tensile strength can be determined with reference to GB / T 1447-2005 Test Method for Tensile Properties of Fiber Reinforced Plastics.

[0136] In some embodiments, the compressive strength of the buffer layer 133 can be any value between 1.5 MPa and 70 MPa, such as 1.5 MPa, 10 MPa, 20 MPa, 30 MPa, 40 MPa, 50 MPa, 60 MPa, 70 MPa, etc.

[0137] In some cases, the compressive strength of the buffer layer 133 can be determined with reference to the "GBT1453-2005 Test Method for Flat Compression Performance of Sandwich Structures or Cores".

[0138] In the technical solution of this application embodiment, since the two sides of the reinforcing layer 134 are respectively connected to the first fiber resin layer 131 and the second fiber resin layer 132, the protective plate 13 is enhanced with higher strength, which is beneficial to the connection stability of the protective plate 13 after it is connected to the housing 11. At the same time, the first fiber resin layer 131 and / or the second fiber resin layer 132 can be tightly bonded to the buffer layer 133 to form a relatively stable integrated structure, thereby improving the structural stability of the protective plate 13. Meanwhile, since the reinforcing layer 134 is connected to the first fiber resin layer 131 and the second fiber resin layer 132, and the buffer layer 133 is connected to the first fiber resin layer 131 and / or the second fiber resin layer 132, the reinforcing layer 134 and the buffer layer 133 share some space, resulting in a higher energy density of the battery device 100.

[0139] According to some embodiments of this application, referring to Figures 3-9, the first surface 1331 is connected to the first fiber resin layer 131, and the second surface 1332 is connected to the second fiber resin layer 132.

[0140] Since the resin portions of the first fiber resin layer 131 and the second fiber resin layer 132 have a certain degree of viscosity, during the processing of the protective plate 13, the aforementioned resin portions can make the connection between the buffer layer 133 and the first fiber resin layer 131 and the second fiber resin layer 132 more compact.

[0141] In the above scheme, the two sides of the buffer layer 133 are connected to the first fiber resin layer 131 and the second fiber resin layer 132 respectively, which can make the first fiber resin layer 131, the second fiber resin layer 132 and the buffer layer 133 more tightly bonded together, so that the protective plate 13 has higher structural stability.

[0142] According to some embodiments of this application, referring to FIG10, the first fiber resin layer 131 is located on the side of the reinforcing layer 134 facing the battery cell 12, a first gap is provided between the first surface 1331 and the first fiber resin layer 131, and the second surface 1332 is connected to the second fiber resin layer 132.

[0143] Please refer to Figure 10. Due to the presence of the first gap, the buffer layer 133 will deform towards the first gap when deformed, thereby reducing the risk of excessive deformation of the protective plate 13 caused by the buffer layer 133 squeezing the reinforcing layer 134, such as failure of the connection between the various parts of the protective plate 13.

[0144] In the above scheme, due to the existence of the first gap, after the external force is transmitted to the buffer layer 133, the buffer layer 133 has a larger deformation space, which is beneficial to improving the collapse energy absorption effect of the buffer layer 133. At the same time, the buffer layer 133 will deform towards the first gap, so the risk of the structural stability of the protective plate 13 being reduced due to the deformation of the buffer layer 133 in all directions is low.

[0145] According to some embodiments of this application, referring to FIG11, the first fiber resin layer 131 is located on the side of the reinforcing layer 134 facing the battery cell 12, the first surface 1331 is connected to the first fiber resin layer 131, and a second gap is provided between the second surface 1332 and the second fiber resin layer 132.

[0146] Please refer to Figure 11. Due to the existence of the second gap, after the external force is applied to the second fiber resin layer 132, it will be preferentially transmitted to the reinforcing layer 134.

[0147] In the above scheme, due to the existence of the second gap, after the external force is applied to the second fiber resin layer 132, it will be preferentially transmitted to the reinforcing layer 134. When the external force is relatively small, the protective plate 13 will not be excessively deformed, and the protective plate 13 and the box 11 will still maintain a relatively stable connection.

[0148] According to some embodiments of this application, referring to FIG6, a plurality of buffer layers 133 are provided, the plurality of buffer layers 133 are spaced apart, and an enhancement layer 134 is provided between two adjacent buffer layers 133.

[0149] Since the structure of the reinforcing layer 134 is relatively stable, the buffer layer 133 may transmit external forces in multiple directions after collapsing and deforming. Setting a reinforcing layer 134 between two adjacent buffer layers 133 can limit the deformation range of the buffer layer 133 to a certain extent.

[0150] In the above scheme, the reinforcement layer 134 can limit the deformation range of the buffer layer 133, reducing the risk of structural instability of the protective plate 13 due to excessive deformation of the buffer layer 133, or even failure of connection with the box 11.

[0151] According to some embodiments of this application, please refer to Figures 9 and 12. The reinforcing layer 134 includes a reinforcing strip, and the battery device 100 includes at least one battery cell assembly. The battery cell assembly includes a plurality of battery cells 12 stacked along a first direction X. The first direction X is perpendicular to the large surface of the battery cell 12, and the reinforcing strip extends along the first direction X.

[0152] The outer casing of the battery cell 12 generally has multiple surfaces. The large surface of the battery cell 12 refers to the surface with the largest area in the battery cell 12, and the above surface generally overlaps with the surface with the largest area of ​​the electrode assembly.

[0153] In some embodiments, each battery cell assembly corresponds to a reinforcing strip.

[0154] In some embodiments, each battery cell assembly corresponds to multiple reinforcing strips.

[0155] In some embodiments, multiple battery cell assemblies correspond to one reinforcement strip.

[0156] In the above scheme, the extension direction of the reinforcing strip is consistent with the arrangement direction of multiple battery cells 12 in the same battery cell assembly, which simplifies the assembly difficulty of the protective plate 13.

[0157] According to some embodiments of this application, referring to Figures 9-12, in the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of the reinforcing strip at least partially overlaps with the orthographic projection of the battery cell assembly.

[0158] After the external force is transmitted to the reinforcing bar, part of the external force can be evenly distributed through the plastic deformation of the reinforcing bar.

[0159] In the above scheme, the impact load brought by external force can be evenly distributed by the reinforcing strips and then transferred to the battery cell assembly, which reduces the risk of excessive deformation of the battery cell 12 and helps to improve the reliability of the battery device 100.

[0160] According to some embodiments of this application, referring to Figures 9-12, the battery cell 12 has two opposite sides 121 along a second direction Y, and the second direction Y, the first direction X, and the thickness direction of the protective plate 13 are perpendicular to each other. Reinforcing strips are respectively provided on the protective plate 13 at positions corresponding to the sides 121. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projections of the same side 121 of multiple battery cells 12 in the battery cell assembly at least partially overlap with the orthographic projection of the same reinforcing strip.

[0161] Each battery cell 12 has two opposing sides 121 along the second direction Y. These sides 121 are located at the shoulders of the battery cell 12. In a square battery cell 12, the two ends along the length of the battery cell 12 can be referred to as the shoulders of the battery cell 12. The edges at the two ends along the length of the battery cell 12 are relatively short and connected to the apex of the outer casing, thus exhibiting strong resistance to deformation. In other words, the shoulder structure of the battery cell 12 has strong structural strength. Since the orthographic projection of the same side 121 of multiple battery cells 12 in the battery cell assembly at least partially overlaps with the orthographic projection of the same reinforcing strip, external forces will first be transmitted to the side 121 of the battery cell 12 with higher structural strength.

[0162] In the above scheme, the external force will first be transmitted to the side 121 of the battery cell 12 with higher structural strength, which helps to reduce the risk of excessive deformation of the battery cell 12.

[0163] According to some embodiments of this application, please refer to Figures 9-12. Multiple battery cell assemblies are provided, and the multiple battery cell assemblies are arranged along the second direction Y. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of two adjacent battery cell assemblies at least partially overlaps with the orthographic projection of the same reinforcing strip.

[0164] Within the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projections of two adjacent battery cell modules overlap at least partially with the orthographic projection of the same reinforcing strip. This means that after the external force is evenly distributed through the reinforcing strip, it will be dispersed to the shoulders of different battery cells 12 in different battery cell modules, which can further disperse the external force and reduce the external force acting on a single battery cell 12.

[0165] In the above scheme, since the orthographic projection of two adjacent battery cell modules overlaps at least partially with the orthographic projection of the same reinforcing strip, the external force, after being transmitted to the inside of the housing 11 by the reinforcing strip, will be distributed by the side 121 with higher structural strength in the battery cell 12 of the two adjacent battery cell modules, further reducing the risk of excessive deformation of a certain battery cell 12 in the same battery cell module.

[0166] According to some embodiments of this application, please refer to Figures 6-7. The reinforcing layer 134 is a reinforcing plate, and the buffer layer 133 includes a first buffer layer 1333 and a second buffer layer 1334. The first buffer layer 1333, the reinforcing plate and the second buffer layer 1334 are arranged along a first direction X, and the first direction X intersects with the thickness direction of the protective plate 13.

[0167] The size of the first buffer layer 1333 may be the same as or different from the size of the second buffer layer 1334.

[0168] In some embodiments, the protective plate 13 is connected to the housing 11 by fasteners 138. Some of the fasteners 138 can be arranged around the edge of the reinforcing plate, and others can be arranged around the edge of the protective plate 13. That is, providing a reinforcing plate can increase the number of fasteners 138 on the protective plate 13, thereby improving the connection stability between the protective plate 13 and the housing 11. Furthermore, the fasteners 138 arranged on the reinforcing plate have a lower risk of torque attenuation.

[0169] In the above scheme, the reinforcement plate can improve the structural strength of the protective plate 13. The first and second buffers can enable the protective plate 13 to have a certain ability to collapse and absorb energy when it is impacted on one side of its thickness direction. This can reduce the risk of the impact force being transmitted to the inside of the housing 11 and causing the battery cell 12 to be over-deformed, weaken the impact of the impact force on the battery cell 12, and improve the reliability of the battery.

[0170] According to some embodiments of this application, at least a portion of the orthographic projection of the battery cell 12 overlaps with the orthographic projection of the reinforcing plate in the same projection plane perpendicular to the thickness direction of the protective plate 13.

[0171] In the same projection plane perpendicular to the thickness direction of the protective plate 13, at least a portion of the orthographic projection of the battery cell 12 overlaps with the orthographic projection of the reinforcing plate, which means that the external force will not act directly on the battery cell 12, but will be dispersed by the reinforcing plate.

[0172] In the above scheme, since at least part of the orthographic projection of the battery cell 12 overlaps with the orthographic projection of the reinforcing plate, the external force is only transmitted to the battery cell 12 after being dispersed by the reinforcing plate, which reduces the risk of excessive deformation of the battery cell 12 caused by excessive external force acting directly on it.

[0173] According to some embodiments of this application, please refer to Figures 6 and 7. Along the second direction Y, at least one end of the reinforcing plate protrudes from the first buffer layer 1333 and the second buffer layer 1334. The first direction X, the second direction Y and the thickness direction of the protective plate 13 are perpendicular to each other.

[0174] In some embodiments, the first direction X is the front-rear direction of the vehicle 1000, and the second direction Y is the left-right direction of the vehicle 1000. Since at least one end of the reinforcing plate protrudes from the first buffer layer 1333 and the second buffer layer 1334, the protective plate 13 can resist not only the bottom impact of the vehicle 1000 but also the side impact of the vehicle 1000.

[0175] In the above scheme, when the two sides of the protective plate 13 are impacted along the second direction Y, the impact force will be transmitted to the reinforcement first. Since the reinforcement has high structural strength, the risk of excessive deformation of the protective plate 13 is low, thereby further improving the battery's ability to resist external impacts in the second direction Y.

[0176] According to some embodiments of this application, referring to FIG6, the protective plate 13 further includes an edge sealing portion 136, the reinforcing layer 134 has a third surface and a fourth surface opposite to each other along its thickness direction, and an outer peripheral surface connecting the third surface and the fourth surface, the buffer layer 133 covers a portion of the outer peripheral surface, the edge sealing portion 136 covers the remaining outer peripheral surface, and the edge sealing portion 136 connects the first fiber resin layer 131 and the second fiber resin layer 132.

[0177] In some embodiments, the edge banding 136 may be naturally formed by the first fiber resin layer 131 and / or the second fiber resin layer 132 under external force during processing. In other embodiments, the edge banding 136 may also be subsequently injection molded.

[0178] In some embodiments, referring to FIG6, the sealing portion 136 may be provided on the outer peripheral surface of the portion of the reinforcing layer 134 that protrudes from the buffer layer 133.

[0179] In the above scheme, the sealing part 136 can reduce the risk of the exposed reinforcement layer 134 being corroded, which is beneficial to improving the reliability of the battery device 100.

[0180] According to some embodiments of this application, please refer to FIG6. The first fiber resin layer 131 is located on the side of the second fiber resin layer 132 facing the housing 11. The second fiber resin layer 132 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 fiber resin layer 131. The fifth connecting portion 1322 is connected to at least one of the buffer layer 133 and the reinforcing layer 134.

[0181] In some embodiments, the fifth connecting portion 1322 is a protrusion that protrudes from the fourth connecting portion 1321, and a recess is formed on the side of the protrusion away from the second fiber resin layer 132, and the buffer layer 133 and the reinforcing layer 134 are received in the recess.

[0182] In the above scheme, a protective plate 13 with a concave-convex structure can be formed by molding process.

[0183] According to some embodiments of this application, referring to Figures 8 and 9, the reinforcing layer 134 has a through hole extending along its thickness direction, and a buffer layer 133 is disposed in the through hole.

[0184] The shape of the through hole can include, but is not limited to, round holes, polygonal holes, and irregularly shaped holes.

[0185] In the above scheme, the through hole can pre-position the buffer layer 133, reducing the assembly difficulty of the protective plate 13.

[0186] According to some embodiments of this application, referring to FIG3, the second fiber resin layer 132 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 reinforcing layer 134, and the fifth connecting portion 1322 is connected to the buffer layer 133.

[0187] In some embodiments, the fifth connecting portion 1322 is a protrusion that protrudes from the fourth connecting portion 1321, and a recess is formed on the side of the protrusion away from the second fiber resin layer 132, and the buffer layer 133 is received in the recess.

[0188] In the above scheme, the protective plate 13 with a buffer layer 133 inside the through hole can also be formed by molding process.

[0189] According to some embodiments of this application, referring to FIG3, the protective plate 13 further includes a reinforcing member 135, which is located on the side of the fourth connection portion 1321 opposite to the first fiber resin layer 131.

[0190] In some embodiments, the second fiber resin layer 132 has a protrusion, and by providing a reinforcing member 135 around the outer periphery of the protrusion, the overall outer contour of the protective plate 13 can be plate-shaped. This arrangement allows for efficient processing of the protective plate 13 through an extrusion process. Of course, when the fastener 138 passes through the reinforcing member 135, the connection strength between the protective plate 13 and the housing 11 can also be improved.

[0191] In some embodiments, the reinforcing member 135 is made of fiber-reinforced resin composite material, and its tensile strength can be determined with reference to GB / T 1447-2005 Test Method for Tensile Properties of Fiber Reinforced Plastics.

[0192] In some embodiments, the reinforcing member 135 is made of metal, and its tensile strength can be determined with reference to GB / T 228.1-2021 Metallic materials, tensile testing - Part 1: Room temperature test method.

[0193] In some embodiments, the tensile strength of the reinforcing member 135 can be any value between 200 MPa and 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, and 520 MPa. , 540MPa, 560MPa, 580MPa, 600MPa, 620MPa, 640MPa, 660MPa, 680MPa, 700MPa, 720MPa, 740MPa, 760MPa, 780MPa, 800MPa, 820MPa, 840MPa, 860MPa, 880MPa, 900MPa, 920MPa, 940MPa, 960MPa, 980MPa, 1000MPa, etc.

[0194] In the above scheme, the reinforcement 135 can further enhance the structural strength of the protective plate 13. At the same time, the protective plate 13 can be processed into a flat plate by extrusion molding, which is conducive to improving the production efficiency of the protective plate 13.

[0195] According to some embodiments of this application, please refer to FIG3, the side of the reinforcing member 135 opposite to the fourth connecting portion 1321 is flush with the side of the fifth connecting portion 1322 opposite to the first fiber resin layer 131.

[0196] The side of the reinforcing member 135 facing away from the fourth connecting part 1321 is flush with the side of the fifth connecting part 1322 facing away from the first fiber resin layer 131. This means that when external force is transmitted to the side of the reinforcing member 135 facing away from the fourth connecting part 1321, it can be diffused more evenly, and the risk of stress concentration is lower.

[0197] The above solution helps to reduce the risk of stress concentration between the reinforcing member 135 and the second fiber resin layer 132.

[0198] According to some embodiments of this application, please refer to FIG3. The protective plate 13 is provided with a first mounting hole 137, which passes through the first fiber resin layer 131, the fourth connecting part 1321 and the reinforcing member 135 in sequence.

[0199] The first mounting hole 137 can be either a smooth hole or a threaded hole.

[0200] In some embodiments, the first mounting hole 137 is disposed around the buffer layer 133. That is, when the fastener 138 is disposed in the first mounting hole 137, the fastener 138 will not contact the buffer layer 133. On the one hand, the fastener 138 can have a high connection strength, and on the other hand, the buffer layer 133 can have a high integrity, so that it has a preset collapse energy absorption capacity.

[0201] In the above scheme, the mounting hole passes through the reinforcement 135, which can reduce the risk of torque attenuation of the fastener 138 set in the mounting hole.

[0202] According to some embodiments of this application, the reinforcing member 135 is disposed around the fifth connecting portion 1322.

[0203] The reinforcing member 135 is arranged around the fifth connecting part 1322, which means that the reinforcing member 135 and the fifth connecting part 1322 share a portion of space.

[0204] In the above scheme, the reinforcing member 135 and the fifth connecting part 1322 share a portion of space, which is beneficial to improving the energy density of the battery device 100.

[0205] According to some embodiments of this application, the material of the reinforcing member 135 is independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin, or glass fiber reinforced polystyrene resin.

[0206] According to some embodiments of this application, the reinforcing member 135 includes multiple layers of first fiber-reinforced prepreg.

[0207] In the above scheme, while improving the strength and stiffness 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.

[0208] According to some embodiments of this application, please refer to FIG13. The protective plate 13 is provided with a plurality of second mounting holes 140, which pass through the first fiber resin layer 131 and the fourth connecting portion 1321 in sequence.

[0209] The second mounting hole 140 allows direct connection to the housing 11 after passing through the first fiber resin layer 131 and the second fiber resin layer 132, making assembly relatively easy.

[0210] The above solution reduces the assembly difficulty of the fastener 138 located in the second mounting hole 140.

[0211] According to some embodiments of this application, please refer to FIG13. A plurality of fifth connecting portions 1322 are provided, and the plurality of fifth connecting portions 1322 are spaced apart. A plurality of buffer layers 133 are provided, and the plurality of buffer layers 133 correspond one-to-one with the plurality of fifth connecting portions 1322. A portion of the second mounting holes 140 are provided between two adjacent fifth connecting portions 1322.

[0212] The fact that some of the second mounting holes 140 are located between two adjacent fifth connecting portions 1322 means that the fasteners 138 located in the second mounting holes 140 can share some space with the fifth connecting portions 1322.

[0213] In the above scheme, the fastener 138 provided in the second mounting hole 140 can share part of the space with the fifth connecting part 1322, which is beneficial to improving the energy density of the battery device 100.

[0214] According to some embodiments of this application, please refer to FIG13. The box body 11 includes a beam body 113. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the second mounting hole 140 is located in the orthographic projection of the beam body 113.

[0215] The beam 113 can be an inherent horizontal or longitudinal beam inside the box 11, or it can be a suspended beam outside the box 11.

[0216] In the above scheme, the fastener 138, after passing through the mounting hole and connecting to the beam 113, does not occupy the space inside the housing 11 used for arranging the battery cells 12, which is beneficial to improving the energy density of the battery device 100. At the same time, the beam 113 generally has higher structural strength than other walls of the housing 11, which is beneficial to improving the connection stability between the protective plate 13 and the housing 11.

[0217] According to some embodiments of this application, referring to FIG13, the battery device 100 further includes a fastener 138, the fastener 138 including a head 1381 and a rod 1382, the rod 1382 passing through the second mounting hole 140, the head 1381 being positioned on the side of the fourth connecting portion 1321 away from the battery cell 12, and along the thickness direction of the protective plate 13, the head 1381 not extending beyond the surface of the fifth connecting portion 1322 away from the battery cell 12.

[0218] Fastener 138 can be self-tapping screws, bolts, nuts, screws, rivets, etc.

[0219] The number of fasteners 138 can be one or more.

[0220] The fastener 138 may pass through the housing 11 first and then through the first fiber resin layer 131, or it may pass through the first fiber resin layer 131 first and then enter the housing 11. For example, in some embodiments, the housing 11 includes a base plate and a frame, and the fastener 138 can be fastened to the frame. In other embodiments, the housing 11 also includes a flange portion surrounding the frame, and the fastener 138 can pass through the flange portion to connect to the protective plate 13.

[0221] The fastener 138 can be made of metal or non-metal. In embodiments where the fastener 138 is made of metal, the material may include, but is not limited to, carbon steel, alloy steel, stainless steel, aluminum alloy, brass, etc. In embodiments where the fastener 138 is made of non-metal, the material may include, but is not limited to, plastic, etc.

[0222] In the above scheme, since the head 1381 does not extend beyond the fifth connecting part 1322 away from the surface of the battery cell 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. This is conducive to maintaining a tighter connection between the protective plate 13 and the housing 11, thereby enabling the battery device 100 to have higher structural stability and reliability.

[0223] According to some embodiments of this application, referring to FIG13, the protective plate 13 further includes an edge sealing portion 136, the reinforcing layer 134 has a third surface and a fourth surface opposite to each other along its thickness direction, and an outer peripheral surface connecting the third surface and the fourth surface, the edge sealing portion 136 covers the outer peripheral surface and connects the first fiber resin layer 131 and the second fiber resin layer 132.

[0224] In some embodiments, the edge banding 136 may be naturally formed by the first fiber resin layer 131 and / or the second fiber resin layer 132 under external force during processing. In other embodiments, the edge banding 136 may also be subsequently injection molded.

[0225] In the above scheme, the edge sealing part 136 can reduce the risk of corrosion due to the exposed reinforcement.

[0226] According to some embodiments of this application, please refer to FIG3, the material of the edge sealing portion 136 includes resin.

[0227] Resins can include thermosetting resins, such as epoxy resins, phenolic resins, urea-formaldehyde resins, melamine resins, unsaturated polyester resins, silicone resins, polyurethanes, etc.

[0228] Resins can include thermoplastic resins, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.

[0229] Of course, resins can also include, but are not limited to, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, etc.

[0230] According to some embodiments of this application, the dimension of the edge sealing portion 136 in the direction perpendicular to the outer peripheral surface is D, which satisfies: 1mm≤D≤10mm.

[0231] The dimension of the edge sealing portion 136 in the direction perpendicular to the outer peripheral surface can be any value greater than or equal to 1 mm and less than or equal to 10 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, etc.

[0232] In the above scheme, when D≥1mm, the risk of the reinforcing layer 134 being exposed can be reduced, and the battery device 100 can have higher reliability; when D≤10mm, the sealing part 136 occupies less space in the protective plate 13, and the structural strength of the protective plate 13 is higher; therefore, when 1mm≤D≤10mm, the risk of the reinforcing layer 134 being exposed can be reduced while the protective plate 13 can also have higher structural strength.

[0233] According to some embodiments of this application, the protective plate 13 further includes an adhesive layer, wherein the first fiber resin layer 131 and the reinforcing layer 134 are bonded together by an adhesive layer 139; and / or, the second fiber resin layer 132 and the reinforcing layer 134 are bonded together by an adhesive layer 139.

[0234] In some embodiments, the adhesive layer 139 may be in the form of a thin film, pre-laid at a designated position before the protective plate 13 is processed, and automatically achieves the effect of bonding the two parts of the protective plate 13 during the molding or extrusion process.

[0235] In the above scheme, by setting the adhesive layer 139, the connection between the various parts of the protective plate 13 can be made tighter and the structure more stable.

[0236] According to some embodiments of this application, the adhesive layer includes a resin film layer.

[0237] The material of the resin film layer can include thermosetting resins, such as epoxy resin, phenolic resin, urea-formaldehyde resin, melamine resin, unsaturated polyester resin, silicone resin, polyurethane, etc.

[0238] The material of the resin film layer can include thermoplastic resins, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.

[0239] Of course, the materials of the resin film layer can also include, but are not limited to, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, etc.

[0240] According to some embodiments of this application, the thickness of the adhesive layer 139 is T, where 0 mm < T ≤ 0.5 mm.

[0241] The thickness of the adhesive layer 139 can be any value between 0 mm and 0.5 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0242] In the above scheme, when T > 0 mm, 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 ≤ 0.5 mm, the space occupied by the adhesive layer 139 is smaller and the energy density of the battery device 100 is higher; therefore, when 0 mm < T ≤ 0.5 mm, the battery device 100 can balance high reliability and energy density.

[0243] According to some embodiments of this application, the first fiber resin layer 131 is independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin, or glass fiber reinforced polystyrene resin; and / or, the second fiber resin layer 132 is independently selected from glass fiber reinforced polyamide resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polyethylene resin, glass fiber reinforced polycarbonate resin, or glass fiber reinforced polystyrene resin.

[0244] According to some embodiments of this application, the first fiber resin layer 131 includes multiple layers of second fiber-reinforced prepreg; and / or, the second fiber resin layer 132 includes multiple layers of third fiber-reinforced prepreg.

[0245] In the above scheme, while improving the strength and stiffness 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.

[0246] According to some embodiments of this application, the material of the buffer layer 133 includes at least one of balsa wood, honeycomb, rubber, foam material and rigid polyurethane.

[0247] According to some embodiments of this application, the reinforcing layer 134 is made of at least one of steel, titanium, ceramic, and high-strength plastic.

[0248] According to some embodiments of this application, 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.

[0249] The thickness of the first fiber resin layer 131 can be any value between 0.6 mm and 2 mm, such as 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0250] The thickness of the reinforcing layer 134 can be any value between 0.3 mm and 1.2 mm, such as 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, etc.

[0251] The thickness of the second fiber resin layer 132 can be any value between 0.4 mm and 1.5 mm, such as 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, etc.

[0252] In the above scheme, when H2≥0.6mm, the second fiber resin layer 132 has a large thickness and a strong ability to resist the impact of gravel; when H2≤2mm, the space occupied by the second fiber resin layer 132 is small, and the battery device 100 has a high energy density; therefore, when 0.6mm≤H2≤2mm, while the second fiber resin layer 132 has a strong ability to resist the impact of gravel, the battery device 100 can also have a high energy density.

[0253] When H3 ≥ 0.4 mm, the first fiber resin layer 131 has a strong ability to uniformly distribute load, which can weaken the impact force transmitted to the battery cell 12; when H3 ≤ 1.5 mm, the space occupied by the first fiber resin layer 131 is small, and the battery has a high energy density; therefore, when 0.4 mm ≤ H3 ≤ 1.5 mm, the first fiber resin layer 131 has a strong ability to uniformly distribute load, and the battery can also have a high energy density.

[0254] When H4 ≥ 0.3 mm, the reinforcing layer 134 has a large thickness, and the protective plate 13 has high structural strength; when H4 ≤ 1.2 mm, the reinforcing layer 134 occupies less space, and the battery device 100 has high energy density; therefore, when 0.3 mm ≤ H4 ≤ 1.2 mm, the battery device 100 can balance high structural strength and energy density.

[0255] According to some embodiments of this application, please refer to FIG1. ​​This application provides an electrical device, which includes the battery device 100 in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0256] In the above solutions, since the battery device 100 in one or more of the above embodiments has high reliability, the power-consuming device including the battery device 100 in one or more of the above embodiments also has high reliability.

[0257] According to some embodiments of this application, referring to Figures 3 and 4, this application provides a battery device 100. The battery device 100 includes a housing 11, a battery cell 12, and a protective plate 13. The battery cell 12 is disposed within the housing 11. The protective plate 13 includes a first fiber resin layer 131, a second fiber resin layer 132, a buffer layer 133, and a reinforcing layer 134. The buffer layer 133 and the reinforcing layer 134 are disposed between the first fiber resin layer 131 and the second fiber resin layer 132. The two sides of the reinforcing layer 134 are respectively connected to the first fiber resin layer 131 and the second fiber resin layer 132. The buffer layer 133 has a first surface 1331 and a second surface 1332 facing each other. The first surface 1331 is connected to the first fiber resin layer 131, and the second surface 1332 is connected to the second fiber resin layer 132.

[0258] According to some embodiments of this application, referring to Figures 5-7, this application provides a battery device 100. The battery device 100 includes a housing 11, a battery cell 12, and a protective plate 13. The battery cell 12 is disposed within the housing 11. The protective plate 13 includes a first fiber resin layer 131, a second fiber resin layer 132, a buffer layer 133, and a reinforcing layer 134. The buffer layer 133 and the reinforcing layer 134 are disposed between the first fiber resin layer 131 and the second fiber resin layer 132. The two sides of the reinforcing layer 134 are respectively connected to the first fiber resin layer 131 and the second fiber resin layer 132. The buffer layer 133 has a first surface 1331 and a second surface 1332 facing each other. The first surface 1331 is connected to the first fiber resin layer 131, and the second surface 1332 is connected to the second fiber resin layer 132. The reinforcing layer 134 is a reinforcing plate, and the buffer layer 133 includes a first buffer layer 1333 and a second buffer layer 1334. The first buffer layer 1333, the reinforcing plate, and the second buffer layer 1334 are arranged along a first direction X, which intersects the thickness direction of the protective plate 13. Along the second direction Y, at least one end of the reinforcing plate protrudes from the first buffer layer 1333 and the second buffer layer 1334. The first direction X, the second direction Y, and the thickness direction of the protective plate 13 are perpendicular to each other.

[0259] According to some embodiments of this application, referring to Figures 8-9, this application provides a battery device 100. The battery device 100 includes a housing 11, a battery cell 12, and a protective plate 13. The battery cell 12 is disposed within the housing 11. The protective plate 13 includes a first fiber resin layer 131, a second fiber resin layer 132, a buffer layer 133, and a reinforcing layer 134. The buffer layer 133 and the reinforcing layer 134 are disposed between the first fiber resin layer 131 and the second fiber resin layer 132. The two sides of the reinforcing layer 134 are respectively connected to the first fiber resin layer 131 and the second fiber resin layer 132. The buffer layer 133 has a first surface 1331 and a second surface 1332 facing each other. The first surface 1331 is connected to the first fiber resin layer 131, and the second surface 1332 is connected to the second fiber resin layer 132. The reinforcing layer 134 includes reinforcing strips. The battery device 100 includes at least one battery cell assembly. The battery cell assembly includes a plurality of battery cells 12 stacked along a first direction X, which is perpendicular to the large surface of the battery cell 12. The reinforcing strips extend along the first direction X. The battery cell 12 has two opposite sides 121 along a second direction Y. The second direction Y, the first direction X, and the thickness direction of the protective plate 13 are perpendicular to each other. Reinforcing strips are respectively provided on the protective plate 13 at positions corresponding to the sides 121. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of the same side 121 of the plurality of battery cells 12 in the battery cell assembly at least partially overlaps with the orthographic projection of the same reinforcing strip. A plurality of battery cell assemblies are provided, and the plurality of battery cell assemblies are arranged along the second direction Y. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of two adjacent battery cell assemblies at least partially overlaps with the orthographic projection of the same reinforcing strip.

[0260] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body; a battery cell arranged in the box body; a protection plate comprising a first fiber resin layer, a second fiber resin layer, a buffer layer and a reinforcing layer, the buffer layer and the reinforcing layer being arranged between the first fiber resin layer and the second fiber resin layer, the reinforcing layer being connected to the first fiber resin layer and the second fiber resin layer on both sides, the buffer layer having opposite first and second surfaces, the first surface being connected to the first fiber resin layer, and / or the second surface being connected to the second fiber resin layer.

2. The battery device according to claim 1, characterized by The first surface is connected to the first fiber resin layer, and the second surface is connected to the second fiber resin layer.

3. The battery device of claim 1, wherein The first fiber resin layer is arranged on the side of the reinforcing layer facing the battery cell, a first gap is arranged between the first surface and the first fiber resin layer, and the second surface is connected to the second fiber resin layer.

4. The battery device of claim 1, wherein The first fiber resin layer is arranged on the side of the reinforcing layer facing the battery cell, the first surface is connected to the first fiber resin layer, and a second gap is arranged between the second surface and the second fiber resin layer.

5. The battery device according to any one of claims 1 to 4, characterized by, A plurality of buffer layers are arranged, the buffer layers are arranged at intervals, and the reinforcing layer is arranged between adjacent two buffer layers.

6. The battery device according to any one of claims 1 to 5, wherein The reinforcing layer comprises a reinforcing strip, the battery device comprises at least one battery cell assembly, the battery cell assembly comprises a plurality of battery cells arranged in a first direction, the first direction is perpendicular to the direction of the large surface of the battery cell, and the reinforcing strip extends in the first direction.

7. The battery device of claim 6, wherein In the same projection plane perpendicular to the thickness direction of the protection plate, the orthogonal projection of the reinforcing strip at least partially overlaps the orthogonal projection of the battery cell assembly.

8. The battery device according to claim 6 or 7, characterized by The battery cell has two opposite sides in a second direction, the second direction, the first direction and the thickness direction of the protection plate are perpendicular to each other; The reinforcing strip is arranged at a position corresponding to the side on the protection plate, and in the same projection plane perpendicular to the thickness direction of the protection plate, the orthogonal projection of the side of the same side of the plurality of battery cells in the battery cell assembly at least partially overlaps the orthogonal projection of the same reinforcing strip.

9. The battery device of claim 8, wherein, A plurality of battery cell assemblies are arranged, the battery cell assemblies are arranged in the second direction, and in the same projection plane perpendicular to the thickness direction of the protection plate, the orthogonal projection of adjacent two battery cell assemblies at least partially overlaps the orthogonal projection of the same reinforcing strip.

10. The battery device of any one of claims 1-5, wherein, The reinforcing layer is a reinforcing plate, the buffer layer comprises a first buffer layer and a second buffer layer, the first buffer layer, the reinforcing plate and the second buffer layer are arranged in a first direction, and the first direction intersects the thickness direction of the protection plate.

11. The battery device of claim 10, wherein, In the same projection plane perpendicular to the thickness direction of the protection plate, at least part of the orthogonal projection of the battery cell overlaps the orthogonal projection of the reinforcing plate.

12. The battery device of claim 11, wherein, In the second direction, at least one end of the reinforcing plate protrudes from the first buffer layer and the second buffer layer, the first direction, the second direction and the thickness direction of the protection plate are perpendicular to each other.

13. The battery device of any one of claims 10-12, wherein, The protective plate further comprises an edge sealing portion, the reinforcing layer has a third surface and a fourth surface opposite to each other along the thickness direction, and an outer peripheral surface connecting the third surface and the fourth surface, the cushion layer covers a part of the outer peripheral surface, and the edge sealing portion covers the remaining outer peripheral surface, and the edge sealing portion connects the first fiber resin layer and the second fiber resin layer.

14. The battery device according to claim 6 or 10, wherein The first fiber resin layer is located on the side of the second fiber resin layer facing the box body, 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 fiber resin layer, and the fifth connecting portion is connected with at least one of the cushion layer and the reinforcing layer.

15. The battery device of any one of claims 1-5, wherein, The reinforcing layer has a through hole penetrating through along the thickness direction, and the through hole is provided with the cushion layer.

16. The battery device of claim 15, 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 reinforcing layer, and the fifth connecting portion is connected with the cushion layer.

17. The battery device according to claim 14 or 16, characterized by The protective plate further comprises a reinforcing member, and the reinforcing member is located on the side of the fourth connecting portion away from the first fiber resin layer.

18. The battery device of claim 17, 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.

19. The battery device according to claim 17 or 18, characterized by The protective plate is provided with a first mounting hole, and the first mounting hole sequentially penetrates through the first fiber resin layer, the fourth connecting portion and the reinforcing member.

20. The battery device of any one of claims 17-19, wherein, The reinforcing member is arranged around the fifth connecting portion.

21. The battery device of any one of claims 17-20, wherein, 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.

22. The battery device of any one of claims 17-21, wherein, The reinforcing member comprises a plurality of first fiber reinforced prepregs stacked on each other.

23. The battery device of claim 14 or 16, wherein, The protective plate is provided with a plurality of second mounting holes, and the second mounting holes sequentially penetrate through the first fiber resin layer and the fourth connecting portion.

24. The battery device of claim 23, wherein, The fifth connecting portion is provided in plurality, and the plurality of fifth connecting portions are arranged at intervals, the cushion layer is provided in plurality, and the plurality of fifth connecting portions correspond to the plurality of cushion layers one by one, and part of the second mounting holes are arranged between adjacent two fifth connecting portions.

25. The battery device of claim 24, wherein, The box body comprises a beam body, and in the same projection plane perpendicular to the thickness direction of the protective plate, the second mounting hole is located in the orthographic projection of the beam body.

26. The battery device of any one of claims 23-25, wherein, The battery device further comprises a fastener, the fastener comprises a head portion and a rod portion, the rod portion penetrates through the second mounting hole, the head portion is arranged on the side of the fourth connecting portion away from the battery monomer, and in the thickness direction of the protective plate, the head portion does not exceed the surface of the fifth connecting portion away from the battery monomer.

27. The battery device of claim 15, wherein, The protective plate further comprises an edge sealing portion, the reinforcing layer has a third surface and a fourth surface opposite to each other along the thickness direction, and an outer peripheral surface connecting the third surface and the fourth surface, the edge sealing portion covers the outer peripheral surface and connects the first fiber resin layer and the second fiber resin layer.

28. The battery device of claim 13 or 27, wherein, The material of the edge sealing portion comprises resin.

29. The battery device of claim 13 or 27, wherein, The size of the edge sealing portion in the direction perpendicular to the outer circumferential surface is D, and 1mm≤D≤10mm is satisfied.

30. The battery device of any one of claims 1-29, wherein, The protective plate further comprises a bonding layer, the first fiber resin layer and the reinforcing layer are bonded through the bonding layer; and / or, the second fiber resin layer and the reinforcing layer are bonded through the bonding layer.

31. The battery device of claim 30, wherein, The bonding layer comprises a resin film layer.

32. The battery device of claim 30 or 31, wherein, The thickness of the bonding layer is T, and 0mm 33. The battery device of any one of claims 1-32, wherein, 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; 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.

34. The battery device of any one of claims 1-33, wherein, The first fiber resin layer comprises a plurality of layers of second fiber reinforced prepregs stacked on each other; The second fiber resin layer comprises a plurality of layers of third fiber reinforced prepregs stacked on each other.

35. The battery device of any one of claims 1-34, wherein, The material of the buffer layer comprises at least one of basswood, honeycomb, rubber, foamed material, and hard polyurethane.

36. The battery device of any one of claims 1-35, wherein, The material of the reinforcing layer comprises at least one of steel, titanium, ceramic, and high-strength plastic.

37. The battery device of any one of claims 1-36, wherein, The thickness of the second fiber resin layer is H2, and 0.6mm≤H2≤2mm is satisfied; The thickness of the first fiber resin layer is H3, and 0.4mm≤H3≤1.5mm is satisfied; The thickness of the reinforcing layer is H4, and 0.3mm≤H4≤1.2mm is satisfied.

38. An electrical device, comprising: The battery device as claimed in any one of claims 1-37 is used to provide electric energy.

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