Battery device and electrical device

Abstract

Disclosed in the present application are a battery device and an electrical device, belonging to the technical field of batteries. The battery device comprises a battery cell and a box body, wherein the box body is used for accommodating the battery cell; the box body comprises a protective plate; the protective plate carries the battery cell, and the protective plate comprises a first fiber resin layer, a second fiber resin layer, a buffer layer and a reinforcing member; the buffer layer and the reinforcing member are both arranged between the first fiber resin layer and the second fiber resin layer; the buffer layer has a first surface and a second surface opposite to each other, the first surface being connected to the first fiber resin layer, and / or the second surface being connected to the second fiber resin layer. The battery device has high reliability.

Description

Battery devices and electrical appliances Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 202411595017.6, filed on November 8, 2024, entitled “Battery Device and Power Consumption Device”, 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 reliability 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 reliability of the battery device.

[0006] In a first aspect, this application provides a battery device, which includes a battery cell and a housing. The housing is used to accommodate the battery cell and includes a protective plate that supports the battery cell. The protective plate includes a first fiber resin layer, a second fiber resin layer, a buffer layer, and a reinforcing member. The buffer layer and the reinforcing member are both disposed between 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. 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, the first fiber resin layer and / or the second fiber resin layer can be tightly bonded to the buffer layer to form a relatively stable integrated structure, thereby improving the structural stability of the protective plate. The reinforcement can improve the overall rigidity of the protective plate and reduce the risk of excessive deformation after being subjected to external impact. The buffer layer enables the protective plate to have a certain capacity for collapsing and absorbing energy, thereby reducing the risk of impact force being transmitted to the inside of the casing, causing excessive deformation of the battery cells. This, in turn, makes the battery device highly reliable.

[0008] In one or more embodiments of the first aspect, the battery device includes at least one battery cell assembly, the battery cell assembly including a plurality of battery cells stacked along a first direction, the surface of the battery cell perpendicular to the first direction being the surface with the largest area of ​​the battery cell. The reinforcing member extends along a second direction, the first and second directions intersect, and both the first and second directions are perpendicular to the thickness direction of the protective plate.

[0009] In the above solution, the extension direction of the reinforcing member intersects with the arrangement direction of multiple battery cells in the battery cell assembly, which can reduce the risk of excessive deformation of the protective plate due to force in a single direction.

[0010] In one or more embodiments of the first aspect, the first direction, the second direction, and the thickness direction of the protective plate are perpendicular to each other.

[0011] In the above scheme, since the extension direction of the reinforcing member is perpendicular to the arrangement direction of multiple battery cells in the battery cell assembly and the thickness direction of the protective plate, the reinforcing member, battery cell and protective plate can serve as references to each other during the assembly process, thereby simplifying the assembly difficulty of the battery device.

[0012] In one or more embodiments of the first aspect, the support member is disposed between the battery cell and the protective plate, and the support member extends along a first direction.

[0013] In the above design, the support components improve the assembly stability of the battery cells. Simultaneously, during the transmission of external forces, the support components also provide some resistance to deformation, further reducing the risk of excessive deformation of the battery cells. Furthermore, the intersection of the extension direction of the support components and the extension direction of the reinforcing components further reduces the risk of excessive deformation of the battery cells when the protective plate is subjected to a force in one direction.

[0014] In one or more embodiments of the first aspect, a cavity is formed inside the support member.

[0015] In the above scheme, because there is space inside the support, the support also has a certain ability to collapse and absorb energy, thereby further reducing the risk of external force being transmitted to the battery cell and causing excessive deformation of the battery cell.

[0016] In one or more embodiments of the first aspect, the battery cell has two opposing sides along a second direction. Support members 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 support member.

[0017] In the above scheme, the external force is first transmitted to the side of the battery cell with higher structural strength before being transmitted to the battery cell, thereby further reducing the risk of excessive deformation of the battery cell.

[0018] 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 perpendicular to 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 support member.

[0019] 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 support member, the external force, after being transmitted from the protective plate to the inside of the box, will be distributed by the side with higher structural strength of the battery cell in the two adjacent battery cell modules, further reducing the risk of excessive deformation of a certain battery cell in the same battery cell module.

[0020] In one or more embodiments of the first aspect, the orthographic projection of the support member intersects with the orthographic projection of the reinforcement member in the same projection plane perpendicular to the thickness direction of the protective plate.

[0021] In the above scheme, before the local impact is transmitted to the battery cell, the orthographic projection of the support member and the orthographic projection of the reinforcement member intersect in the same projection plane perpendicular to the thickness direction of the protective plate. The support member and the reinforcement member are distributed in a grid pattern. The impact force is distributed by the grid-like support member and reinforcement member, thereby further reducing the risk of excessive deformation of the battery cell.

[0022] In one or more embodiments of the first aspect, multiple support members are provided, and the multiple support members are spaced apart along the second direction. In the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the reinforcing member intersects with the orthographic projection of each support member.

[0023] In the above scheme, since the orthographic projection of the reinforcing member intersects with the orthographic projection of each supporting member in the same projection plane perpendicular to the thickness direction of the protective plate, the external force can be further distributed, thereby further reducing the risk of excessive deformation of the battery cell.

[0024] 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 battery cell, the support is made of fiber resin material, and the support is integrally formed with the first fiber resin layer.

[0025] In the above scheme, since the support component is integrally formed with the first fiber resin layer, the risk of stress concentration between the support component and the protective plate is low, and the overall structural stability of the battery device is high.

[0026] In one or more embodiments of the first aspect, a pressure relief mechanism is provided on the side of the battery cell facing the protective plate.

[0027] In the above scheme, when the battery device is used in a vehicle, the protective plate is generally closer to the ground and farther away from the passengers. Since the pressure relief mechanism is set on the side of the battery cell facing the protective plate, when the battery cell thermally runs away, the direction of the discharge will be away from the passengers, thereby reducing the risk of passenger injury and improving the reliability of the battery device during use.

[0028] In one or more embodiments of the first aspect, a plurality of reinforcing members are provided, the plurality of reinforcing members are spaced apart along a first direction, each reinforcing member extends along a second direction, the first direction and the second direction intersect, and both the first direction and the second direction are perpendicular to the thickness direction of the protective plate.

[0029] In the above scheme, the addition of multiple reinforcing members can further improve the overall rigidity of the protective plate, thereby enhancing its structural stability. Furthermore, the spaced arrangement of multiple reinforcing members allows for a reduction in the overall weight of the protective plate while maintaining high structural strength.

[0030] In one or more embodiments of the first aspect, a buffer layer is provided between two adjacent reinforcing members.

[0031] In the above scheme, the deformation range of the buffer layer can be limited by the two adjacent reinforcing members, thereby reducing the risk of the protective plate structure becoming unstable and detaching from the box due to excessive deformation during the process of the buffer layer collapsing and deforming.

[0032] In one or more embodiments of the first aspect, a cavity is formed inside the reinforcing member.

[0033] In the above solution, because the reinforcing component has a cavity inside, it also has a certain capacity for collapsing and absorbing energy, thereby further reducing the risk of external forces being transmitted to the inside of the casing and causing excessive deformation of the battery cells.

[0034] In one or more embodiments of the first aspect, the reinforcing member extends along the second direction, the reinforcing member is made of fiber resin material, and the reinforcing member includes multiple layers of first fiber-reinforced prepreg, the fiber direction of each layer of first fiber-reinforced prepreg being parallel to the second direction.

[0035] In the above scheme, since the fiber direction of the first fiber-reinforced prepreg is parallel to the extension direction of the reinforcing member, when the reinforcing member is subjected to localized external force impact, the fibers of different layers can work together to disperse and resist the external force, reducing the risk of failure due to excessive localized stress on the reinforcing member. At the same time, this arrangement also helps to improve the bending strength of the reinforcing member.

[0036] In one or more embodiments of the first aspect, the protective plate further includes a reinforcing layer, the reinforcing layer including a first connecting portion, the first connecting portion being connected to both a first fiber resin layer and a second fiber resin layer, the first connecting portion being disposed around the buffer layer and the reinforcing member.

[0037] In the above solution, since the first connecting part is connected to both the first fiber resin layer and the second fiber resin layer, the position where the first connecting part is set on the protective plate has high strength, which allows the protective plate to be connected to the box at the above position, thereby improving the connection stability between the protective plate and the box.

[0038] In one or more embodiments of the first aspect, the reinforcing layer further includes a second connecting portion, which is connected to the first connecting portion, and both sides of the second connecting portion are respectively connected to the second fiber resin layer and the second surface.

[0039] In the above scheme, when the external force is transmitted from one side of the second fiber resin layer to the inside of the protective plate, since the two sides of the second connection part are connected to the second fiber resin layer and the second surface respectively, the second connection part can contact the external force before the buffer layer, thereby reducing the risk that the buffer layer will be irreversibly deformed by slight impact, which is beneficial to improving the structural stability of the protective plate.

[0040] In one or more embodiments of the first aspect, the reinforcing layer further includes a second connecting portion, which is connected to the first connecting portion, and both sides of the second connecting portion are respectively connected to the first fiber resin layer and the first surface.

[0041] In the above scheme, when the external force is transmitted from the second fiber resin layer to the inside of the protective plate, since the two sides of the second connection are connected to the first fiber resin layer and the first surface respectively, the buffer layer can come into contact with the external force before the second connection. The external force has been dispersed by the buffer layer before it is transmitted to the second connection. The risk of local excessive deformation of the second connection is low, and the life of the reinforcement layer is high.

[0042] In one or more embodiments of the first aspect, the first connecting portion encloses to form a through hole, and the buffer layer and the reinforcing member are located inside the through hole.

[0043] In the above scheme, the through holes can pre-position the buffer layer, reducing the assembly difficulty of the protective plate.

[0044] 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.

[0045] 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.

[0046] In the above scheme, the edge sealing can reduce the risk of corrosion due to the exposed reinforcement layer.

[0047] In one or more embodiments of the first aspect, the edge sealing material includes resin.

[0048] 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.

[0049] 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.

[0050] In one or more embodiments of the first aspect, the second fiber resin layer includes a third connecting portion and a fourth connecting portion, the third connecting portion is disposed around the fourth connecting portion, the fourth connecting portion protrudes away from the first fiber resin layer relative to the third connecting portion, the third connecting portion is connected to the first connecting portion, and the battery cell is disposed on the side of the fourth connecting portion away from the second fiber resin layer.

[0051] In the above scheme, the fourth connecting part protrudes away from the first fiber resin layer relative to the third connecting part, and the third connecting part is connected to the first connecting part. A protective plate with a concave-convex structure can be formed by molding process.

[0052] In one or more embodiments of the first aspect, the first fiber resin layer is connected to the second fiber resin layer.

[0053] In the above scheme, the first fiber resin layer and the second fiber resin layer can be directly connected using their resin portions, making assembly relatively easy.

[0054] In one or more embodiments of the first aspect, the second fiber resin layer includes a third connecting portion and a fourth connecting portion, the third connecting portion is disposed around the fourth connecting portion, the fourth connecting portion protrudes away from the first fiber resin layer relative to the third connecting portion, the third connecting portion is connected to the first fiber resin layer, and the battery cell is disposed on the side of the fourth connecting portion away from the second fiber resin layer.

[0055] In the above scheme, the fourth connecting part protrudes away from the first fiber resin layer relative to the third connecting part, and the third connecting part is connected to the first fiber resin layer. A protective plate with a concave-convex structure can be formed by molding.

[0056] 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 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; or, a second gap is provided between the second surface and the second fiber resin layer, and the first surface is connected to the first fiber resin layer.

[0057] In the above scheme, due to the presence of the first or second 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 during collapse. At the same time, the deformation direction of the buffer layer is relatively fixed, and the risk of the protective plate structure stability decreasing due to the extrusion of the reinforcing member is low.

[0058] In one or more embodiments of the first aspect, the protective plate further includes a reinforcing member located on the side of the third connection portion opposite to the first fiber resin layer.

[0059] 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 shape through extrusion molding, which is beneficial to improving the production efficiency of the protective plate.

[0060] In one or more embodiments of the first aspect, the side of the reinforcing member opposite to the third connecting portion is flush with the side of the fourth connecting portion opposite to the first fiber resin layer.

[0061] The above solution helps reduce the risk of stress concentration between the reinforcing member and the fourth connection.

[0062] In one or more embodiments of the first aspect, the protective plate is provided with mounting holes that pass through the first fiber resin layer, the fourth connecting portion, and the reinforcing member in sequence.

[0063] 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.

[0064] 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 mounting hole, the head being positioned on the side of the third connection away from the battery cell, and the head not extending beyond the surface of the fourth connection away from the battery cell along the thickness direction of the protective plate.

[0065] In the above scheme, since the head does not extend beyond the surface of the fourth 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 making the connection of the protective plate more stable, thereby giving the battery device higher structural stability and reliability.

[0066] In one or more embodiments of the first aspect, the reinforcing member is disposed around the fourth connection portion.

[0067] 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.

[0068] 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.

[0069] In one or more embodiments of the first aspect, the reinforcing member comprises multiple layers of second fiber-reinforced prepreg.

[0070] 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.

[0071] In one or more embodiments of the first aspect, the housing further includes a frame surrounding the protective plate; the first fiber resin layer is located on the side of the second fiber resin layer facing the battery cell, the first fiber resin layer includes a fifth connecting portion and a sixth connecting portion, the fifth connecting portion is disposed around the sixth connecting portion, the sixth connecting portion protrudes away from the first fiber resin layer relative to the fifth connecting portion, the fifth connecting portion is connected to the frame, and the battery cell is disposed on the side of the sixth connecting portion away from the second fiber resin layer.

[0072] In the above scheme, since the sixth connecting part protrudes away from the first fiber resin layer relative to the fifth connecting part, the fifth connecting part is connected to the frame. When the maximum thickness of the protective plate is constant, the side of the sixth connecting part away from the second fiber resin layer can form a certain receiving space, which is beneficial to improving the volumetric energy density of the battery device.

[0073] 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 battery cell, and the thickness of the second fiber resin layer is H1, satisfying: 0.6mm ≤ H1 ≤ 2mm. And / or, the thickness of the first fiber resin layer is H2, satisfying: 0.4mm ≤ H2 ≤ 1.5mm.

[0074] In the above scheme, when H1≥0.6mm, the second fiber resin layer has a large thickness and a strong ability to resist the impact of gravel; when H1≤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≤H1≤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.

[0075] When H2 ≥ 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 H2 ≤ 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 ≤ H2 ≤ 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.

[0076] 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.

[0077] In one or more embodiments of the first aspect, the first fiber resin layer comprises multiple layers of a third fiber-reinforced prepreg; and / or, the second fiber resin layer comprises multiple layers of a fourth fiber-reinforced prepreg.

[0078] 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.

[0079] 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.

[0080] Secondly, this application provides an electrical device that includes the battery device described in one or more of the above embodiments, the battery device being used to provide electrical energy.

[0081] In the above solutions, since the battery device has high reliability, the power supply device including the battery device of one or more of the above embodiments also has high reliability.

[0082] 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

[0083] 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:

[0084] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0085] Figure 2 is an exploded view of a battery device according to some embodiments of this application;

[0086] Figure 3 is an exploded view of a battery cell according to some embodiments of this application;

[0087] Figure 4 is an exploded view of the protective plate of some embodiments of this application;

[0088] Figure 5 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0089] Figure 6 is a magnified view of a portion A in Figure 5;

[0090] Figure 7 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0091] Figure 8 is a schematic diagram of the structure of the protective plate according to some embodiments of this application;

[0092] Figure 9 is a cross-sectional view of a portion of the structure of a protective plate according to some embodiments of this application;

[0093] Figure 10 is a cross-sectional view of a portion of the structure of a protective plate according to some embodiments of this application;

[0094] Figure 11 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0095] Figure 12 is a cross-sectional view of a portion of the structure of a battery device according to some other embodiments of this application;

[0096] Figure 13 is a cross-sectional view of a portion of the structure of a battery device according to some other embodiments of this application.

[0097] The reference numerals in the detailed embodiments are as follows:

[0098] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 113 - Frame; 12 - Battery Cell; 121 - Housing; 1211 - End Cap; 1212 - Shell; 1213 - Side; 122 - Electrode Assembly; 123 - Electrode Terminal; 124 - Adapter Plate; 125 - Pressure Relief Mechanism; 13 - Protective Plate; 131 - First Fiber Resin Layer; 1311 - Fifth Connection; 1312 - Sixth Connection; 1 32-Second fiber resin layer; 1321-Third connecting part; 1322-Fourth connecting part; 133-Buffer layer; 1331-First surface; 1332-Second surface; 134-Reinforcing layer; 1341-First connecting part; 1342-Second connecting part; 135-Reinforcing member; 136-Edge sealing part; 137-Mounting hole; 138-Fastener; 1381-Head; 1382-Ring part; 139-Reinforcing member; 14-Support member; X-First direction; Y-Second direction; Z-Thickness direction of protective plate. Detailed Implementation

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0104] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0105] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0106] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0107] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0108] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0109] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0110] In some implementations, the electrode assembly is a stacked structure.

[0111] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0117] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0118] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0119] 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.

[0120] In a typical battery cell structure, a battery cell includes a casing, electrode components, 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 components. The casing can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0121] The development of battery technology must take into account multiple design factors, such as energy density, reliability, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0122] Some battery packs include protective plates to mitigate impact forces and protect the individual battery cells from external impacts. To improve the rigidity and structural stability of the protective plate, a reinforcing layer is typically incorporated within it. While this enhances the structural stability of the protective plate, its ability to absorb energy through collapse is relatively weak. Consequently, when subjected to an external impact, the force transmitted to the individual battery cells is greater, increasing the risk of excessive deformation and lowering the overall reliability of the battery pack.

[0123] In view of this, this application provides a battery device, which includes a battery cell and a housing. The housing is used to house the battery cell and includes a protective plate that supports the battery cell. The protective plate includes a first fiber resin layer, a second fiber resin layer, a buffer layer, and a reinforcing member. The buffer layer and the reinforcing member are both disposed between the first and second fiber resin layers. The buffer layer has a first surface and a second surface facing each other. 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 first fiber resin layer and / or the second fiber resin layer can be tightly bonded to the buffer layer to form a relatively stable integrated structure, thereby improving the structural stability of the protective plate. The reinforcing member can improve the overall rigidity of the protective plate and reduce the risk of excessive deformation after the protective plate is subjected to external impact. The buffer layer can give the protective plate a certain ability to collapse and absorb energy, thereby reducing the risk of impact force being transmitted to the inside of the housing and causing excessive deformation of the battery cell. This results in higher reliability of the battery device.

[0124] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0125] 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.

[0126] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0127] 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.

[0128] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or a combination thereof. 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 a combination thereof to form a battery cell assembly, and then the battery cell assemblies can be connected in series, parallel, or a combination thereof to form the battery device 100. In other words, the multiple battery cells 12 can directly form the battery device 100, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into the battery device 100.

[0129] 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.

[0130] 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 123 of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals 123 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.

[0131] 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 cell assembly. The number of battery cells 12 included in a battery cell assembly is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies, which can be connected in series, parallel, or mixed connection.

[0132] Please refer to Figure 3, which is an exploded view of a battery cell 12 according to some embodiments of this application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212, and multiple walls of the shell 1212 form a cavity that can be used to accommodate the electrode assemblies 122. The shape of the shell 1212 depends on the combined shape of the one or more electrode assemblies 122. For example, the shell 1212 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 1212 has an opening so that one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution. The battery cell 12 may also include two electrode terminals 123, which may be disposed on an end cap 1211. The end cap 1211 is typically flat, with two electrode terminals 123 fixed to its flat surface. These terminals are designated as a positive electrode terminal and a negative electrode terminal, respectively. Each electrode terminal 123 is associated with a corresponding adapter piece 124, located between the end cap 1211 and the electrode assembly 122, used to electrically connect the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, depending on actual usage requirements, the electrode assembly 122 can be single or multiple, with multiple independent electrode assemblies 122 disposed within the battery cell 12.

[0133] According to some embodiments of this application, please refer to Figures 4-7. This application provides a battery device 100, which includes a battery cell 12 and a housing 11. The housing 11 is used to accommodate the battery cell 12. The housing 11 includes a protective plate 13, which supports the battery cell 12. The protective plate 13 includes a first fiber resin layer 131, a second fiber resin layer 132, a buffer layer 133, and a reinforcing member 139. The buffer layer 133 and the reinforcing member 139 are both disposed between 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.

[0134] The protective plate 13 supports the battery cell 12, meaning that the protective plate 13 is used to support the weight of the battery cell 12. In some embodiments, a support member 14 may also be provided between the protective plates 13, so that the weight of the battery cell 12 is ultimately supported by the protective plate 13 in the direction of gravity. This can also be described as a mechanical contact between the protective plate 13 and the battery cell 12 in the direction of gravity.

[0135] In some embodiments, the protective plate 13 can be any wall of the housing 11, such as the bottom or side of the housing 11. Taking the vehicle 1000 as an example, the bottom of the housing 11 can refer to the side of the housing 11 closest to the ground after the battery device 100 is installed in the vehicle 1000.

[0136] In some embodiments, the thickness direction of the protective plate 13 is parallel to the direction of gravity.

[0137] In some embodiments, the second fiber resin layer 132 is closer to the ground than the first fiber resin layer 131.

[0138] In some embodiments, the housing 11 may further include a frame 113 and a cover, the frame 113 having two opposing openings, the cover closing one of the openings, and the protective plate 13 closing the other opening, together defining a receiving space for housing the battery cell 12. Of course, in some other embodiments, the housing 11 may include a housing body with one opening, and the protective plate 13 closing the opening of the housing body to form the aforementioned receiving space.

[0139] In some embodiments, the first fiber resin layer 131 is a flat plate structure, and / or the second fiber resin layer 132 is a flat plate structure.

[0140] In some embodiments, the reinforcing member 139 may be made of metal, such as aluminum, copper, steel, stainless steel, titanium alloy, etc. The reinforcing member 139 may also be a metal profile.

[0141] In some embodiments, the cross-sectional shape of the reinforcing member 139 can be rectangular, trapezoidal, or the like. In other embodiments, the cross-sectional shape of the reinforcing member 139 can also be square, rectangular, or the like. In this embodiment, it is beneficial to reduce the weight of the reinforcing member 139, thereby increasing the energy density of the battery device 100.

[0142] 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.

[0143] Both the buffer layer 133 and the reinforcing member 139 are placed between 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 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. This means that one side of the buffer layer 133 will be 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.

[0144] In some embodiments, the reinforcing member 139 and the buffer layer 133 are arranged along the first direction X, and the reinforcing member 139 and the buffer layer 133 share a portion of the space, which is beneficial to improving the energy density of the battery device 100.

[0145] In some embodiments, the reinforcement 139 and the buffer layer 133 are arranged along the thickness direction Z of the protective plate.

[0146] In some embodiments, the reinforcement 139 is connected to one of the first fiber resin layer 131 and the second fiber resin layer 132.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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".

[0153] In some embodiments, the battery cell 12 may include a pressure relief mechanism 125, which may be disposed on any wall of the battery cell 12, for example, on the side of the battery cell 12 away from the protective plate 13 along the thickness direction Z of the protective plate.

[0154] In the technical solution of this application embodiment, 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. The reinforcement 139 can improve the overall rigidity of the protective plate 13 and reduce the risk of excessive deformation of the protective plate 13 after being subjected to external impact. The buffer layer 133 can enable the protective plate 13 to have a certain ability to collapse and absorb energy, thereby reducing the risk of the impact force being transmitted to the inside of the housing 11 and causing the battery cell 12 to be subjected to excessive deformation. This makes the battery device 100 have high reliability.

[0155] According to some embodiments of this application, referring to Figures 4-7, 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 surface of each battery cell 12 perpendicular to the first direction X is the surface with the largest area of ​​the battery cell 12. The reinforcing member 139 extends along a second direction Y, where the first direction X and the second direction Y intersect. Both the first direction X and the second direction Y are perpendicular to the thickness direction Z of the protective plate.

[0156] The reinforcement 139 extends along the second direction Y, meaning that the length direction of the reinforcement 139 is parallel to the second direction Y. In some embodiments, in the projection plane perpendicular to the thickness direction Z of the protective plate, the length direction of the orthographic projection of the reinforcement 139 is the length direction of the reinforcement 139, that is, the extension direction of the reinforcement 139.

[0157] The intersection of the first direction X and the second direction Y means that the first direction X and the second direction Y are set at an angle. For example, the angle between the first direction X and the second direction Y is 30°, 60°, 90°, 120°, 150°, etc. When the angle between the first direction X and the second direction Y is 90°, it can also be said that the first direction X is perpendicular to the second direction Y.

[0158] In some embodiments, the orthographic projection of the reinforcing member 139 intersects with the plurality of battery cells 12 in the same projection plane perpendicular to the thickness direction Z of the protective plate.

[0159] In some embodiments, the battery device 100 includes a plurality of battery cell assemblies, which are spaced apart along a second direction Y. In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the reinforcing member 139 intersects with the orthographic projection of the battery cell 12 of the different battery cell assemblies.

[0160] In the above solution, the extension direction of the reinforcing member 139 intersects with the arrangement direction of the multiple battery cells 12 in the battery cell assembly, which can reduce the risk of excessive deformation of the protective plate 13 due to force in a single direction.

[0161] According to some embodiments of this application, please refer to Figures 4-7, the first direction X, the second direction Y, and the thickness direction Z of the protective plate are perpendicular to each other.

[0162] The first direction X, the second direction Y, and the thickness direction Z of the protective plate are all perpendicular to each other, which means that the extension direction of the reinforcing member 139 is perpendicular to the arrangement direction of the multiple battery cells 12 in the battery cell assembly and the thickness direction Z of the protective plate.

[0163] In the above solution, since the extension direction of the reinforcing member 139 is perpendicular to the arrangement direction of the multiple battery cells 12 in the battery cell assembly and the thickness direction Z of the protective plate, the reinforcing member 139, the battery cells 12, and the protective plate 13 can serve as references to each other during assembly, thereby simplifying the assembly difficulty of the battery device 100. At the same time, it can also improve the maintenance efficiency of the battery device 100.

[0164] According to some embodiments of this application, please refer to Figures 4-7. The support member 14 is disposed between the battery cell 12 and the protective plate 13, and the support member 14 extends along the first direction X.

[0165] The support member 14 is disposed between the battery cell 12 and the protective plate 13, including but not limited to the following embodiments: In some embodiments, the support member 14 is connected to both the battery cell 12 and the protective plate 13. In some embodiments, the support member 14 is connected to one of the battery cell 12 and the protective plate 13. In some embodiments, the support member 14 is not connected to either the battery cell 12 or the protective plate 13.

[0166] In some embodiments, the housing 11 includes a housing body with an opening, a protective plate 13 that closes the opening, and both the protective plate 13 and the support member 14 are fixedly connected to the housing body.

[0167] In some embodiments, the support member 14 is bonded to the outer casing 121 of the battery cell 12. During assembly, the battery cell assembly is pre-bonded to the support member 14 and then the entire assembly is inserted into the frame 113. After assembly, the support member 14 abuts against the protective plate 13.

[0168] The support member 14 extends along the first direction X, which means that the length direction of the reinforcing member 139 is parallel to the first direction X. In some embodiments, in the projection plane perpendicular to the thickness direction Z of the protective plate, the length direction of the orthographic projection of the support member 14 is the length direction of the support member 14, which is also the extension direction of the reinforcing member 139.

[0169] The support member 14 is disposed between the battery cell 12 and the protective plate 13, which means that the external force will pass through the support member 14 before being transmitted to the battery cell 12 after passing through the protective plate 13. In other words, the setting of the support member 14 can further weaken the impact of the external force on the battery cell 12 and improve the reliability of the battery cell 12.

[0170] In some embodiments, the support member 14 may be made of metal, such as aluminum, copper, steel, stainless steel, titanium alloy, etc. The support member 14 may be a metal profile.

[0171] In some embodiments, the support member 14 may be made of fiber resin composite material.

[0172] In the above scheme, the support member 14 can improve the assembly stability of the battery cell 12. At the same time, during the transmission of external forces, the support member 14 can also play a certain role in resisting deformation, thereby further reducing the risk of excessive deformation of the battery cell 12. In addition, the extension direction of the support member 14 intersects with the extension direction of the reinforcing member 139, which can further reduce the risk of excessive deformation of the battery cell 12 when the protective plate 13 is subjected to a force in one direction.

[0173] According to some embodiments of this application, please refer to Figures 4-7, a cavity is formed inside the support member 14.

[0174] The cross-sectional shape of the support member 14 may include, but is not limited to, a square shape, a sun shape, a field shape, etc.

[0175] The cavity can be formed in one step during the production of the support component 14, or it can be formed in two steps through machining or other methods.

[0176] In some embodiments, the cavity has an opening located on the surface of the support 14, which can also be understood as the support 14 having a cavity inside.

[0177] In the above scheme, because the support member 14 has a space inside, it also has a certain ability to collapse and absorb energy, thereby further reducing the risk of excessive deformation of the battery cell 12 caused by external force transmission. The cavity inside the support member 14 can also reduce the weight of the support member 14, thereby increasing the energy density of the battery device 100.

[0178] According to some embodiments of this application, referring to Figures 4-7, the battery cell 12 has two opposite sides 1213 along the second direction Y. Support members 14 are respectively provided on the protective plate 13 at positions corresponding to the sides 1213. In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the same side 1213 of multiple battery cells 12 in the battery cell assembly at least partially overlaps with the orthographic projection of the same support member 14.

[0179] Each battery cell 12 has two opposing sides 1213 along the second direction Y. These sides 1213 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 121, 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 1213 of multiple battery cells 12 in the battery cell assembly at least partially overlaps with the orthographic projection of the same support member 14, external forces will first be transmitted to the side 1213 of the battery cell 12 with higher structural strength.

[0180] In the above scheme, the external force is first transmitted to the side 1213 of the battery cell 12 with higher structural strength before being transmitted to the battery cell 12, thereby further reducing the risk of excessive deformation of the battery cell 12.

[0181] According to some embodiments of this application, please refer to Figures 4-7. 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 Z of the protective plate, the orthographic projection of two adjacent battery cell assemblies at least partially overlaps with the orthographic projection of the same support member 14.

[0182] Within the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projections of two adjacent battery cell assemblies overlap at least partially with the orthographic projection of the same support member 14. This means that after the external force is evenly distributed through the support member 14, it will be dispersed to the shoulders of the battery cells 12 of different battery cell assemblies, which can further disperse the external force and reduce the external force acting on a single battery cell 12.

[0183] 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 support 14, the external force, after being transmitted from the protective plate 13 to the inside of the housing 11, will be distributed by the side 1213 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.

[0184] According to some embodiments of this application, please refer to Figures 4-8. In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the support member 14 intersects with the orthographic projection of the reinforcement member 139.

[0185] In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the support member 14 intersects with the orthographic projection of the reinforcing member 139, which means that the support member 14 and the reinforcing member 139 are distributed in a grid pattern.

[0186] In the above scheme, before the local impact is transmitted to the battery cell 12, since the orthographic projection of the support member 14 and the orthographic projection of the reinforcement member 139 intersect in the same projection plane perpendicular to the thickness direction Z of the protective plate, and the support member 14 and the reinforcement member 139 are distributed in a grid pattern, the impact force will be distributed by the grid-like support member 14 and the reinforcement member 139, thereby further reducing the risk of excessive deformation of the battery cell 12.

[0187] According to some embodiments of this application, please refer to Figures 4-8. Multiple support members 14 are provided, and the multiple support members 14 are spaced apart along the second direction Y. In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the reinforcing member 139 intersects with the orthographic projection of each support member 14.

[0188] In some embodiments, multiple reinforcing members 139 are provided, and in the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of each reinforcing member 139 intersects with the orthographic projection of at least one support member 14.

[0189] In the above scheme, since the orthographic projection of the reinforcing member 139 intersects with the orthographic projection of each support member 14 in the same projection plane perpendicular to the thickness direction Z of the protective plate, the external force can be further distributed, thereby further reducing the risk of excessive deformation of the battery cell 12.

[0190] According to some embodiments of this application, the first fiber resin layer 131 is located on the side of the second fiber resin layer 132 facing the battery cell 12, and the support member 14 is made of fiber resin material, and the support member 14 is integrally formed with the first fiber resin layer 131.

[0191] In some embodiments, the support member 14 comprises multiple layers of fiber-reinforced prepreg, with the fibers in each layer arranged in a unidirectional direction. The fiber orientations of adjacent layers of fiber-reinforced prepreg are staggered at approximately 90°, and the allowable deviation range of the layup angle between the unidirectional strips of adjacent layers of fiber-reinforced prepreg is ±20°. When subjected to tensile force along the fiber extension direction, the fibers in the fiber-reinforced prepreg can effectively bear the tensile force. By staggering the fiber orientations of adjacent layers of fiber-reinforced prepreg at approximately 90°, the uniformity of stress on the support member 14 in all directions is improved.

[0192] In some embodiments, the support member 14 may be molded together with the protective plate 13.

[0193] In the above scheme, since the support member 14 and the first fiber resin layer 131 are integrally formed, the risk of stress concentration between the support member 14 and the protective plate 13 is low, and the overall structural stability of the battery device 100 is high.

[0194] According to some embodiments of this application, as shown in Figures 5-7, a pressure relief mechanism 125 is provided on the side of the battery cell 12 facing the protective plate 13.

[0195] The pressure relief mechanism 125 is used to release the pressure inside the battery cell 12 when the internal pressure or temperature of the battery cell 12 reaches a predetermined value.

[0196] The pressure relief mechanism 125 can be a pressure relief component installed on the housing 121, such as an explosion-proof plate or a safety valve. The pressure relief mechanism 125 can also be integrally formed with the housing 121. The pressure relief mechanism 125 can be provided with a pressure relief groove to allow the battery cell 12 to split along the groove when pressure is released. The pressure relief groove can be a groove extending along a closed trajectory, such as a circular or rectangular trajectory; or it can be a groove extending along a non-closed trajectory, such as an H-shaped, Y-shaped, V-shaped, or U-shaped trajectory.

[0197] In some embodiments, the battery cell 12 includes a housing 121, and a pressure relief mechanism 125 may be disposed on any wall of the housing 121. For example, the housing 121 includes a shell 1212 and an end cap 1211, the shell 1212 having an opening and the end cap 1211 closing the opening. The end cap 1211 is located on the side of the electrode assembly 122 facing the protective plate 13.

[0198] In some embodiments, the orthographic projection of the pressure relief mechanism 125 and the orthographic projection of the support member 14 do not overlap in the same projection plane perpendicular to the thickness direction Z of the protective plate. In other embodiments, multiple support members 14 are provided, spaced apart along the second direction Y, and the orthographic projection of the pressure relief mechanism 125 is located between the orthographic projections of two adjacent support members 14 in the same projection plane perpendicular to the thickness direction Z of the protective plate. The two adjacent support members 14, the protective plate 13, and the outer casing 121 of the battery cell 12 can jointly define the pressure relief channel of the battery cell 12.

[0199] In some embodiments, the battery cell 12 further includes an electrode terminal 123 disposed on the wall portion of the housing 121 opposite to the protective plate 13. Since the electrode terminal 123 and the pressure relief mechanism 125 are located on opposite sides of the battery cell 12, this arrangement reduces the risk of short circuits in the electrode terminal 123 caused by the discharge material when the battery cell 12 is depressurized.

[0200] In the above scheme, when the battery device 100 is used in the vehicle 1000, the protective plate 13 is generally closer to the ground and farther away from the passengers. Since the pressure relief mechanism 125 is located on the side of the battery cell 12 facing the protective plate 13, when the battery cell 12 thermally runs away, the direction of the discharge will be away from the passengers, thereby reducing the risk of passenger injury and improving the reliability of the battery device 100 during use.

[0201] According to some embodiments of this application, as shown in Figures 5-7, a plurality of reinforcing members 139 are provided, and the plurality of reinforcing members 139 are spaced apart along a first direction X. Each reinforcing member 139 extends along a second direction Y. The first direction X and the second direction Y intersect, and both the first direction X and the second direction Y are perpendicular to the thickness direction Z of the protective plate.

[0202] In the above scheme, the arrangement of multiple reinforcing members 139 can further improve the overall rigidity of the protective plate 13, thereby improving the structural stability of the protective plate 13. Furthermore, the spaced arrangement of multiple reinforcing members 139 can reduce the overall weight of the protective plate 13 while maintaining high structural strength.

[0203] According to some embodiments of this application, as shown in Figures 5-7, a buffer layer 133 is provided between two adjacent reinforcing members 139.

[0204] In some embodiments, the buffer layer 133 is provided with a plurality of through holes, which are spaced apart along a first direction X. A plurality of reinforcing members 139 are provided, which correspond one-to-one with the plurality of through holes. At least a portion of the reinforcing members 139 is disposed within the through holes.

[0205] In the above scheme, the deformation range of the buffer layer 133 can be limited by the two adjacent reinforcing members 139, thereby reducing the risk of the protective plate 13 structure becoming unstable and detaching from the box 11 due to excessive deformation during the process of the buffer layer 133 collapsing and deforming.

[0206] According to some embodiments of this application, as shown in Figures 5-7, a cavity is formed inside the reinforcing member 139.

[0207] In some embodiments, the cavity may be formed by an extrusion process.

[0208] In some embodiments, the cavity has an opening that extends to the outer surface of the reinforcement 139. This arrangement can also be understood as the reinforcement 139 having a cavity inside.

[0209] In the above solution, since the reinforcing member 139 has a cavity inside, the reinforcing member 139 also has a certain collapse energy absorption capacity, thereby further reducing the risk of external force being transmitted to the inside of the housing 11 and causing excessive deformation of the battery cell 12.

[0210] According to some embodiments of this application, as shown in Figures 5-7, the reinforcing member 139 extends along the second direction Y. The material of the reinforcing member 139 is fiber resin material. The reinforcing member 139 includes multiple layers of first fiber reinforced prepreg that are stacked on top of each other. The fiber direction of each layer of first fiber reinforced prepreg is parallel to the second direction Y.

[0211] The fibers in each layer of the first fiber-reinforced prepreg are arranged in a unidirectional direction. In some embodiments, the reinforcing member 139 extends along a second direction Y, which is perpendicular to the thickness direction Z of the protective plate. When an external force is applied to the reinforcing member 139 along the thickness direction Z of the protective plate, the fibers in each layer of the first fiber-reinforced prepreg can collectively resist the external force, thereby reducing the risk of the resin's adhesive force failing, the fibers scattering, and the reinforcing member 139 becoming excessively deformed after the external force is applied to the reinforcing member 139.

[0212] In the above scheme, since the fiber directions of the first fiber-reinforced prepreg are all parallel to the extension direction of the reinforcing member 139, when the reinforcing member 139 is subjected to localized external force impact, the fibers of different layers can work together to disperse and resist the external force, reducing the risk of failure due to excessive localized stress on the reinforcing member 139. At the same time, this arrangement also helps to improve the bending strength of the reinforcing member 139.

[0213] According to some embodiments of this application, as shown in Figures 5-7, the protective plate 13 further includes a reinforcing layer 134. The reinforcing layer 134 includes a first connecting portion 1341, which is connected to both the first fiber resin layer 131 and the second fiber resin layer 132. The first connecting portion 1341 is disposed around the buffer layer 133 and the reinforcing member 139.

[0214] In some embodiments, the first connecting portion 1341, the first fiber resin layer 131, and the second fiber resin layer 132 can be connected by structural adhesive or by the adhesive properties of their resin portions.

[0215] 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.

[0216] In some embodiments, the protective plate 13 can be connected to the housing 11 by fasteners 138 passing through the first fiber resin layer 131, the second fiber resin layer 132, and the first connecting portion 1341. Since the fasteners 138 pass through the first connecting portion 1341, the structural strength of the first connecting portion 1341 is relatively high, resulting in high connection stability between the protective plate 13 and the housing 11. Similarly, in other embodiments, the protective plate 13 is connected to the housing 11 at the location where the first connecting portion 1341 is provided, which also ensures high connection stability between the protective plate 13 and the housing 11. Examples include riveting, resin adhesive bonding, gluing, laser welding, and hot pressing. Another example is a combination of the aforementioned two methods.

[0217] In the above scheme, since the first connecting part 1341 is connected to both the first fiber resin layer 131 and the second fiber resin layer 132, the position where the first connecting part 1341 is located on the protective plate 13 has high strength, which allows the protective plate 13 to be connected to the box 11 at the above position, thereby improving the connection stability between the protective plate 13 and the box 11.

[0218] According to some embodiments of this application, as shown in Figures 5, 6 and 11, the reinforcing layer 134 further includes a second connecting portion 1342, which is connected to the first connecting portion 1341, and both sides of the second connecting portion 1342 are connected to the second fiber resin layer 132 and the second surface 1332, respectively.

[0219] In some embodiments, the second connecting portion 1342 is integrally formed with the first connecting portion 1341.

[0220] In the above scheme, when the external force is transmitted from one side of the second fiber resin layer 132 to the interior of the protective plate 13, since the two sides of the second connecting part 1342 are respectively connected to the second fiber resin layer 132 and the second surface 1332, the second connecting part 1342 can contact the external force before the buffer layer 133, thereby reducing the risk that the buffer layer 133 will be irreversibly deformed by slight impact, which is beneficial to improving the structural stability of the protective plate 13.

[0221] According to some embodiments of this application, as shown in Figures 5, 6 and 13, the reinforcing layer 134 further includes a second connecting portion 1342, which is connected to the first connecting portion 1341, and both sides of the second connecting portion 1342 are connected to the first fiber resin layer 131 and the first surface 1331, respectively.

[0222] In some embodiments, the second connecting portion 1342 and the first connecting portion 1341 may be in the form of a flat plate.

[0223] In the above scheme, when the external force is transmitted from the second fiber resin layer 132 to the interior of the protective plate 13, since the two sides of the second connecting part 1342 are respectively connected to the first fiber resin layer 131 and the first surface 1331, the buffer layer 133 can come into contact with the external force before the second connecting part 1342. Before the external force is transmitted to the second connecting part 1342, it has been dispersed by the buffer layer 133. The risk of local excessive deformation of the second connecting part 1342 is low, and the life of the reinforcing layer 134 is high.

[0224] According to some embodiments of this application, as shown in Figures 5, 6 and 12, the first connecting portion 1341 encloses to form a through hole, and the buffer layer 133 and the reinforcing member 139 are located inside the through hole.

[0225] In some embodiments, the through hole may be formed by machining the plate body, and the remaining part of the plate body after the through hole is machined may serve as the first connecting part 1341, or a portion of the remaining part of the plate body after the through hole is machined may serve as the first connecting part 1341.

[0226] In the above scheme, the through hole can pre-position the buffer layer 133, reducing the assembly difficulty of the protective plate 13.

[0227] 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.

[0228] According to some embodiments of this application, as shown in Figures 5, 6, and 11-13, 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.

[0229] 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.

[0230] In the above scheme, the edge sealing part 136 can reduce the risk of corrosion due to the exposed reinforcement layer 134.

[0231] According to some embodiments of this application, the edge banding 136 is made of resin.

[0232] Resins can include thermosetting resins, such as epoxy resins, phenolic resins, urea-formaldehyde resins, melamine resins, unsaturated polyester resins, silicone resins, polyurethanes, etc.

[0233] Resins can include thermoplastic resins, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.

[0234] Of course, resins can also include, but are not limited to, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, etc.

[0235] According to some embodiments of this application, please refer to Figures 5-13. The dimension of the sealing portion 136 in the direction perpendicular to the outer peripheral surface is D, which satisfies: 1mm≤D≤10mm.

[0236] 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 any point value or a range between any two of 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.

[0237] 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.

[0238] According to some embodiments of this application, please refer to Figures 5, 6, and 11-13. The second fiber resin layer 132 includes a third connecting portion 1321 and a fourth connecting portion 1322. The third connecting portion 1321 is disposed around the fourth connecting portion 1322. The fourth connecting portion 1322 protrudes away from the first fiber resin layer 131 relative to the third connecting portion 1321. The third connecting portion 1321 is connected to the first connecting portion 1341. The battery cell 12 is disposed on the side of the fourth connecting portion 1322 away from the second fiber resin layer 132.

[0239] In some embodiments, after arranging the buffer layer 133, the reinforcing member 139, and the reinforcing layer 134, a first fiber resin layer 131 and a second fiber resin layer 132 are placed on both sides respectively, and the protective plate 13 is formed by pressing together the upper and lower molds in one step. After curing and cooling, the protective plate 13 can be removed. At this time, molds of different shapes can be customized according to requirements to process protective plates 13 suitable for different products. For example, the protective plate 13 with the fourth connecting part 1322 protruding away from the first fiber resin layer 131 relative to the third connecting part 1321. After the fourth connecting part 1322 protrudes, fasteners 138, reinforcing members 135, etc. can be arranged around the fourth connecting part 1322.

[0240] In the above scheme, the fourth connecting part 1322 protrudes away from the first fiber resin layer 131 relative to the third connecting part 1321, and the third connecting part 1321 is connected to the first connecting part 1341. The protective plate 13 with a concave-convex structure can be formed by molding process.

[0241] According to some embodiments of this application, please refer to Figures 7, 9 and 10, the first fiber resin layer 131 is connected to the second fiber resin layer 132.

[0242] In some embodiments, the first fiber resin layer 131 and the second fiber resin layer 132 can be connected together during the molding or extrusion process of the protective plate 13.

[0243] In the above scheme, the first fiber resin layer 131 and the second fiber resin layer 132 can be directly connected using their resin portions, making assembly relatively easy.

[0244] According to some embodiments of this application, please refer to Figures 7, 9 and 10. The second fiber resin layer 132 includes a third connecting portion 1321 and a fourth connecting portion 1322. The third connecting portion 1321 is disposed around the fourth connecting portion 1322. The fourth connecting portion 1322 protrudes away from the first fiber resin layer 131 relative to the third connecting portion 1321. The third connecting portion 1321 is connected to the first fiber resin layer 131. The battery cell 12 is disposed on the side of the fourth connecting portion 1322 away from the second fiber resin layer 132.

[0245] In some embodiments, after arranging the buffer layer 133 and the reinforcing member 139, a first fiber resin layer 131 and a second fiber resin layer 132 are placed on both sides respectively, and the protective plate 13 is formed by pressing together the upper and lower molds in one step. After curing and cooling, the protective plate 13 can be removed. At this time, molds of different shapes can be customized according to requirements to process protective plates 13 suitable for different products. For example, the protective plate 13 with the fourth connecting part 1322 protruding away from the first fiber resin layer 131 relative to the third connecting part 1321. After the fourth connecting part 1322 protrudes, fasteners 138, reinforcing members 135, etc. can be arranged around the fourth connecting part 1322.

[0246] In the above scheme, the fourth connecting part 1322 protrudes away from the first fiber resin layer 131 relative to the third connecting part 1321, and the third connecting part 1321 is connected to the first fiber resin layer 131. The protective plate 13 with a concave-convex structure can be formed by molding process.

[0247] According to some embodiments of this application, please refer to Figures 7, 9 and 10. The first fiber resin layer 131 is located on the side of the second fiber resin layer 132 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. Alternatively, a second gap is provided between the second surface 1332 and the second fiber resin layer 132, and the first surface 1331 is connected to the first fiber resin layer 131.

[0248] Due to the presence of the first gap and the second gap, the buffer layer 133 will deform towards the first gap or the second gap when deformed, thereby reducing the risk of excessive deformation of the protective plate 13 caused by the buffer layer 133 pressing against the reinforcing member 139, such as failure of the connection between the various parts of the protective plate 13.

[0249] In the above scheme, due to the presence of the first or second 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 energy absorption effect of the buffer layer 133. At the same time, the deformation direction of the buffer layer 133 is relatively fixed, and the risk of the protective plate 13 structural stability decreasing due to the compression of the reinforcing member 139 is low.

[0250] According to some embodiments of this application, referring to Figures 7-13, the protective plate 13 further includes a reinforcing member 135, which is located on the side of the third connecting portion 1321 opposite to the first fiber resin layer 131.

[0251] In some embodiments, the first fiber resin layer 131 is located on the side of the second fiber resin layer 132 facing the battery cell 12, for example, in Figures 11-13.

[0252] In some embodiments, the second fiber resin layer 132 is located on the side of the first fiber resin layer 131 facing the battery cell 12, and in this case, the reinforcing member 135 is located between the frame 113 and the third connecting portion 1321.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] According to some embodiments of this application, referring to Figures 7-13, the side of the reinforcing member 135 opposite to the third connecting portion 1321 is flush with the side of the fourth connecting portion 1322 opposite to the first fiber resin layer 131.

[0259] The side of the reinforcing member 135 facing away from the third connecting part 1321 is flush with the side of the fourth 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 third connecting part 1321, it can be diffused more evenly, and the risk of stress concentration is lower.

[0260] The above solution helps to reduce the risk of stress concentration between the reinforcing member 135 and the fourth connection part 1322.

[0261] According to some embodiments of this application, please refer to Figures 7-13. The protective plate 13 is provided with mounting holes 137, which pass through the first fiber resin layer 131, the fourth connecting part 1322 and the reinforcing member 135 in sequence.

[0262] Mounting hole 137 can be either a smooth hole or a threaded hole.

[0263] In some embodiments, the mounting hole 137 is provided around the buffer layer 133 and the reinforcement 139. That is, when the fastener 138 is provided in the mounting hole 137, the fastener 138 will not contact the buffer layer 133 and the reinforcement 139. 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.

[0264] In the above solution, the mounting hole 137 passes through the reinforcing member 135, which can reduce the risk of torque attenuation of the fastener 138 set in the mounting hole 137.

[0265] According to some embodiments of this application, please refer to Figures 6, 7, and 11-13. The battery device 100 further includes a fastener 138. The fastener 138 includes a head 1381 and a rod 1382. The rod 1382 passes through a mounting hole 137. The head 1381 is located on the side of the third connecting portion 1321 away from the battery cell 12, along the thickness direction Z of the protective plate. The head 1381 does not extend beyond the surface of the fourth connecting portion 1322 away from the battery cell 12.

[0266] Fastener 138 can be self-tapping screws, bolts, nuts, screws, rivets, etc.

[0267] The number of fasteners 138 can be one or more.

[0268] The fastener 138 can pass through the housing 11 first and then through the first fiber resin layer 131, or it can 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 frame 113 with a flange portion surrounding the frame 113, and the fastener 138 can pass through the flange portion to connect to the protective plate 13. Of course, the fastener 138 can also pass through the second fiber resin layer 132 first and then be fastened to the frame 113.

[0269] 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.

[0270] In the above scheme, since the head 1381 does not extend beyond the fourth 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 making the connection of the protective plate 13 more stable, thereby giving the battery device 100 higher structural stability and reliability.

[0271] According to some embodiments of this application, please refer to Figures 6, 7, and 11-13, the reinforcing member 135 is disposed around the fourth connecting portion 1322.

[0272] The reinforcing member 135 is arranged around the fifth connecting part 1311, which means that the reinforcing member 135 and the fifth connecting part 1311 share a portion of the space.

[0273] In the above scheme, the reinforcing member 135 and the fifth connecting part 1311 share a portion of space, which is beneficial to improving the energy density of the battery device 100.

[0274] 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.

[0275] According to some embodiments of this application, the reinforcing member 135 includes multiple layers of second fiber-reinforced prepreg.

[0276] The fibers in each layer of the second fiber-reinforced prepreg are arranged in a unidirectional manner. The fiber directions of adjacent layers of the second fiber-reinforced prepreg are staggered at approximately 90°, and the allowable deviation range of the layup angle of the unidirectional strips of adjacent layers of the second fiber-reinforced prepreg is ±20°. When subjected to tensile force along the fiber extension direction, the fibers in the second fiber-reinforced prepreg can effectively bear the tensile force. By staggering the fiber directions of adjacent layers of the second fiber-reinforced prepreg, it is beneficial to improve the uniformity of stress on the second fiber resin layer 132 in all directions. In another embodiment, the fibers in the second fiber-reinforced prepreg are interlaced to form a woven fabric. The fiber arrangement of the third and fourth fiber-reinforced prepregs described below is similar to that of the second fiber-reinforced prepreg and will not be repeated.

[0277] 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.

[0278] According to some embodiments of this application, please refer to Figures 6, 7 and 13. The housing 11 also includes a frame 113, which surrounds the protective plate 13. The first fiber resin layer 131 is located on the side of the second fiber resin layer 132 facing the battery cell 12. The first fiber resin layer 131 includes a fifth connecting portion 1311 and a sixth connecting portion 1312. The fifth connecting portion 1311 is disposed around the sixth connecting portion 1312. The sixth connecting portion 1312 protrudes away from the first fiber resin layer 131 relative to the fifth connecting portion 1311. The fifth connecting portion 1311 is connected to the frame 113. The battery cell 12 is disposed on the side of the sixth connecting portion 1312 away from the second fiber resin layer 132.

[0279] In some embodiments, the frame 113 includes a plurality of side beams, which enclose a frame 113 having two opposing openings. The number of side beams can be 2, 3, 4, 5, 6, etc.

[0280] In some embodiments, the frame 113 has a frame structure with two opposing openings.

[0281] In some embodiments, after the buffer layer 133 and the reinforcing member 139 are arranged, or after the buffer layer 133, the reinforcing member 139 and the reinforcing layer 134 are arranged, the first fiber resin layer 131 and the second fiber resin layer 132 are placed on both sides respectively, and the protective plate 13 is formed by pressing the upper and lower molds together in one step. After curing, cooling and other steps, the protective plate 13 can be taken out. At this time, molds of different shapes can be customized according to the needs to process protective plates 13 that are suitable for different products.

[0282] When the maximum thickness of the protective plate 13 is fixed, referring to Figures 12 and 13, compared with the embodiment where the sixth connecting part 1312 and the fifth connecting part 1311 are flat, the sixth connecting part 1312 protrudes away from the first fiber resin layer 131 relative to the fifth connecting part 1311, which can increase the space inside the box 11.

[0283] In the above scheme, since the sixth connecting part 1312 protrudes away from the first fiber resin layer 131 relative to the fifth connecting part 1311, and the fifth connecting part 1311 is connected to the frame 113, when the maximum thickness of the protective plate 13 is constant, the side of the sixth connecting part 1312 away from the second fiber resin layer 132 can form a certain receiving space, which is beneficial to improving the volumetric energy density of the battery device 100.

[0284] According to some embodiments of this application, referring to Figures 6, 7, and 11, the first fiber resin layer 131 is located on the side of the second fiber resin layer 132 facing the battery cell 12, and the thickness of the second fiber resin layer 132 is H1, satisfying: 0.6mm ≤ H1 ≤ 2mm. And / or, the thickness of the first fiber resin layer 131 is H2, satisfying: 0.4mm ≤ H2 ≤ 1.5mm.

[0285] The thickness of the first fiber resin layer 131 can be any value between 0.6 mm and 2 mm, for example, any one of 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, or any range between two of them.

[0286] The thickness of the second fiber resin layer 132 can be any value between 0.4 mm and 1.5 mm, for example, any one of 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, or any range between two of them.

[0287] In the above scheme, when H1≥0.6mm, the second fiber resin layer 132 has a large thickness and a strong ability to resist the impact of gravel; when H1≤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≤H1≤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.

[0288] When H2 ≥ 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 H2 ≤ 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 ≤ H2 ≤ 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.

[0289] 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.

[0290] According to some embodiments of this application, the first fiber resin layer 131 includes multiple layers of a third fiber-reinforced prepreg; and / or, the second fiber resin layer 132 includes multiple layers of a fourth fiber-reinforced prepreg.

[0291] 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.

[0292] 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.

[0293] According to some embodiments of this application, please refer to FIG1, this application provides an electrical device that includes a battery device 100 as described in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0294] In the above solution, since the battery device 100 has high reliability, the power supply device including the battery device 100 of one or more of the above embodiments also has high reliability.

[0295] According to some embodiments of this application, referring to Figures 4-6 and Figure 8, this application provides a battery device 100. The battery device 100 includes a battery cell 12 and a housing 11. The housing 11 is used to accommodate the battery cell 12. The housing 11 also includes a frame 113 and a protective plate 13. The frame 113 surrounds the protective plate 13. The protective plate 13 supports the battery cell 12 and includes a first fiber resin layer 131, a second fiber resin layer 132, a buffer layer 133, a reinforcing member 139, a strengthening layer 134, and a support member 14. The buffer layer 133, the reinforcing member 139, and the strengthening layer 134 are all disposed between the first fiber resin layer 131 and the second fiber resin layer 132.

[0296] The battery assembly 100 includes multiple battery cell assemblies, each comprising multiple battery cells 12 stacked along a first direction X. The surface of each battery cell 12 perpendicular to the first direction X is the surface with the largest area. The multiple battery cell assemblies are arranged along a second direction Y. A reinforcing member 139 extends along the second direction Y, and the first direction X, the second direction Y, and the thickness direction Z of the protective plate are all perpendicular to each other. A support member 14 is disposed between the battery cells 12 and the protective plate 13, and extends along the first direction X. A cavity is formed inside the support member 14. Each battery cell 12 has two opposing sides 1213 along the second direction Y. Support members 14 are respectively disposed on the protective plate 13 at positions corresponding to the sides 1213. In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the same side 1213 of the multiple battery cells 12 in the battery cell assembly at least partially overlaps with the orthographic projection of the same support member 14. In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projections of two adjacent battery cell assemblies at least partially overlap with the orthographic projection of the same support member 14.

[0297] In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the support member 14 intersects with the orthographic projection of the reinforcement member 139. Multiple support members 14 are provided, spaced apart along the second direction Y. In the same projection plane perpendicular to the thickness direction Z of the protective plate, the orthographic projection of the reinforcement member 139 intersects with the orthographic projection of each support member 14. Multiple reinforcement members 139 are provided, spaced apart along the first direction X, and each reinforcement member 139 extends along the second direction Y. A buffer layer 133 is provided between two adjacent reinforcement members 139. The reinforcement members 139 extend along the second direction Y and are made of fiber resin material. Each reinforcement member 139 includes multiple layers of first fiber-reinforced prepreg, with the fiber direction of each layer of first fiber-reinforced prepreg parallel to the second direction Y.

[0298] The first fiber resin layer 131 is located on the side of the second fiber resin layer 132 facing the battery cell 12. A pressure relief mechanism 125 is provided on the side of the battery cell 12 facing the first fiber resin layer 131.

[0299] The reinforcing layer 134 includes a first connecting portion 1341 and a second connecting portion 1342, with the first connecting portion 1341 surrounding the second connecting portion 1342. The second fiber resin layer 132 includes a third connecting portion 1321 and a fourth connecting portion 1322, with the third connecting portion 1321 surrounding the fourth connecting portion 1322, and the fourth connecting portion 1322 protruding relative to the third connecting portion 1321 in a direction away from the first fiber resin layer 131. The first fiber resin layer 131 includes a fifth connecting portion 1311 and a sixth connecting portion 1312, with the fifth connecting portion 1311 surrounding the sixth connecting portion 1312, and the sixth connecting portion 1312 protruding relative to the fifth connecting portion 1311 in a direction away from the first fiber resin layer 131.

[0300] The fifth connecting portion 1311 is connected to the frame 113 and the first connecting portion 1341 on both sides, and the other side of the first connecting portion 1341 is connected to the third connecting portion 1321. The sixth connecting portion 1312, facing the second fiber resin layer 132, is connected to one of the first surface 1331 and the reinforcing member 139. The second connecting portion 1342 is connected to one of the second surface 1332 and the reinforcing member 139 on one side, and the other side of the second connecting portion 1342 is connected to the fourth connecting portion 1322. The support member 14 is disposed between the sixth connecting portion 1312 and the battery cell 12.

[0301] Taking the battery device 100 used in the vehicle 1000 as an example, the second fiber resin layer 132 is closer to the ground, and can withstand minor impacts when the bottom of the battery device 100 is subjected to an impact. The buffer layer 133 can collapse and absorb energy. The reinforcement layer 134 can withstand slightly larger external impacts. At the same time, since the reinforcing member 139 and the support member 14 are distributed in a grid pattern, the external force can be effectively dispersed before it is transmitted to the battery cell 12, thereby reducing the risk of excessive deformation of the battery cell 12. In addition, the grid-distributed reinforcing member 139 and the support member 14 can also give the protective plate 13 high structural stability.

[0302] 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 in that, include: Battery cell; A housing for accommodating the battery cell, the housing including a protective plate that supports the battery cell, the protective plate including a first fiber resin layer, a second fiber resin layer, a buffer layer and a reinforcing member, the buffer layer and the reinforcing member being disposed between the first fiber resin layer and the second fiber resin layer, the buffer layer having a first surface and a second surface opposite to each other, 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 in that, 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, and the surface of the battery cell perpendicular to the first direction is the surface with the largest area of ​​the battery cell. The reinforcing member extends along a second direction, the first direction and the second direction intersect, and both the first direction and the second direction are perpendicular to the thickness direction of the protective plate.

3. The battery device according to claim 2, characterized in that, The first direction, the second direction, and the thickness direction of the protective plate are perpendicular to each other.

4. The battery device according to claim 2 or 3, characterized in that, The battery device also includes: A support member is disposed between the battery cell and the protective plate, and the support member extends along the first direction.

5. The battery device according to claim 4, characterized in that, The support member has a cavity inside.

6. The battery device according to claim 4 or 5, characterized in that, The battery cell has two opposite sides along the second direction; The support members are respectively provided at positions corresponding to the side on the protective plate. In the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the side of the same side of multiple battery cells in the battery cell assembly at least partially overlaps with the orthographic projection of the same support member.

7. The battery device according to any one of claims 4-6, characterized in that, Multiple battery cell assemblies are provided, and the multiple battery cell assemblies are arranged along the second direction. In the same projection plane perpendicular to 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 support member.

8. The battery device according to any one of claims 4-7, characterized in that, In the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the support member intersects with the orthographic projection of the reinforcement member.

9. The battery device according to claim 8, characterized in that, Multiple support members are provided, and the multiple support members are spaced apart along the second direction. In the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the reinforcing member intersects with the orthographic projection of each support member.

10. The battery device according to any one of claims 4-9, characterized in that, The first fiber resin layer is located on the side of the second fiber resin layer facing the battery cell, and the support is made of fiber resin material, and the support is integrally formed with the first fiber resin layer.

11. The battery device according to any one of claims 1-10, characterized in that, A pressure relief mechanism is provided on the side of the battery cell facing the protective plate.

12. The battery device according to any one of claims 1-11, characterized in that, The reinforcing members are provided in multiple ways, and the multiple reinforcing members are spaced apart along a first direction. Each reinforcing member extends along a second direction, and the first direction and the second direction intersect. Both the first direction and the second direction are perpendicular to the thickness direction of the protective plate.

13. The battery device according to claim 12, characterized in that, A buffer layer is provided between two adjacent reinforcing members.

14. The battery device according to any one of claims 1-13, characterized in that, The reinforcing member has a cavity inside.

15. The battery device according to any one of claims 1-13, characterized in that, The reinforcing member extends along the second direction and is made of fiber resin material. The reinforcing member includes multiple layers of first fiber-reinforced prepreg, and the fiber direction of each layer of the first fiber-reinforced prepreg is parallel to the second direction.

16. The battery device according to any one of claims 1-15, characterized in that, The protective plate further includes a reinforcing layer, which includes a first connecting portion connected to both the first fiber resin layer and the second fiber resin layer. The first connecting portion is disposed around the buffer layer and the reinforcing member.

17. The battery device according to claim 16, characterized in that, The reinforcing layer further includes a second connecting portion, which is connected to the first connecting portion, and both sides of the second connecting portion are connected to the second fiber resin layer and the second surface, respectively.

18. The battery device according to claim 16, characterized in that, The reinforcing layer further includes a second connecting portion, which is connected to the first connecting portion, and both sides of the second connecting portion are respectively connected to the first fiber resin layer and the first surface.

19. The battery device according to claim 16, characterized in that, The first connecting portion encloses and forms a through hole, and the buffer layer and the reinforcing member are located within the through hole.

20. The battery device according to any one of claims 16-19, characterized in that, The reinforcing layer is made of at least one of steel, titanium, ceramic, and high-strength plastic.

21. The battery device according to any one of claims 16-20, characterized in that, The protective panel 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 edge sealing portion covers the outer peripheral surface and connects the first fiber resin layer and the second fiber resin layer.

22. The battery device according to claim 21, characterized in that, The edge banding material includes resin.

23. The battery device according to claim 21 or 22, characterized in that, The dimension of the sealing portion in the direction perpendicular to the outer peripheral surface is D, which satisfies: 1mm≤D≤10mm.

24. The battery device according to any one of claims 16-23, characterized in that, The second fiber resin layer includes a third connecting portion and a fourth connecting portion. The third connecting portion is disposed around the fourth connecting portion. The fourth connecting portion protrudes away from the first fiber resin layer relative to the third connecting portion. The third connecting portion is connected to the first connecting portion. The battery cell is disposed on the side of the fourth connecting portion away from the second fiber resin layer.

25. The battery device according to any one of claims 1-15, characterized in that, The first fiber resin layer is connected to the second fiber resin layer.

26. The battery device according to claim 25, characterized in that, The second fiber resin layer includes a third connecting portion and a fourth connecting portion. The third connecting portion is disposed around the fourth connecting portion. The fourth connecting portion protrudes away from the first fiber resin layer relative to the third connecting portion. The third connecting portion is connected to the first fiber resin layer. The battery cell is disposed on the side of the fourth connecting portion away from the second fiber resin layer.

27. The battery device according to claim 25 or 26, characterized in that, 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; or, a second gap is provided between the second surface and the second fiber resin layer, and the first surface is connected to the first fiber resin layer.

28. The battery device according to claim 24 or 26, characterized in that, The protective plate also includes a reinforcing member located on the side of the third connecting portion away from the first fiber resin layer.

29. The battery device according to claim 28, characterized in that, The side of the reinforcing member opposite to the third connecting portion is flush with the side of the fourth connecting portion opposite to the first fiber resin layer.

30. The battery device according to any one of claims 28-29, characterized in that, The protective plate is provided with mounting holes, which pass through the first fiber resin layer, the fourth connecting part and the reinforcing member in sequence.

31. The battery device according to claim 30, characterized in that, The battery device further includes a fastener, which includes a head and a rod. The rod passes through the mounting hole, and the head is positioned on the side of the third connecting portion away from the battery cell. Along the thickness direction of the protective plate, the head does not extend beyond the surface of the fourth connecting portion away from the battery cell.

32. The battery device according to any one of claims 28-31, characterized in that, The reinforcing member is disposed around the fourth connecting portion.

33. The battery device according to any one of claims 28-32, characterized in that, 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.

34. The battery device according to any one of claims 28-33, characterized in that, The reinforcing element comprises multiple layers of second fiber-reinforced prepreg.

35. The battery device according to any one of claims 1-34, characterized in that, The enclosure also includes a frame that surrounds the protective panel; The first fiber resin layer is located on the side of the second fiber resin layer facing the battery cell. The first fiber resin layer includes a fifth connecting portion and a sixth connecting portion. The fifth connecting portion is disposed around the sixth connecting portion. The sixth connecting portion protrudes away from the first fiber resin layer relative to the fifth connecting portion. The fifth connecting portion is connected to the frame. The battery cell is disposed on the side of the sixth connecting portion away from the second fiber resin layer.

36. The battery device according to any one of claims 1-35, characterized in that, The first fiber resin layer is located on the side of the second fiber resin layer facing the battery cell, and the thickness of the second fiber resin layer is H1, which satisfies: 0.6mm≤H1≤2mm; And / or, the thickness of the first fiber resin layer is H2, satisfying: 0.4mm≤H2≤1.5mm.

37. The battery device according to any one of claims 1-36, characterized in that, 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.

38. The battery device according to any one of claims 1-37, characterized in that, The first fiber resin layer comprises multiple layers of third fiber-reinforced prepreg; And / or, the second fiber resin layer comprises multiple layers of a fourth fiber-reinforced prepreg.

39. The battery device according to any one of claims 1-38, characterized in that, The material of the buffer layer includes at least one of balsa wood, honeycomb, rubber, foam material, and rigid polyurethane.

40. An electrical device, characterized in that, Includes a battery device as described in any one of claims 1-39, the battery device being used to provide electrical energy.

Images