Battery device and electrical device

Abstract

The present application relates to the technical field of batteries, and discloses a battery device and an electrical device. The battery device comprises a housing, a battery cell, and a protective plate. The battery cell is arranged in the housing. The protective plate is arranged outside the housing. The protective plate comprises a first fiber resin layer, a reinforcing layer, a buffer layer, and a second fiber resin layer. The reinforcing layer and the buffer layer are located between the first fiber resin layer and the second fiber resin layer. The reinforcing layer has a first surface and a second surface opposite to each other in a thickness direction of the reinforcing layer. At least a part of the first surface and at least a part of the second surface are connected to the buffer layer. The battery device has high reliability.

Description

Battery devices and electrical appliances Cross-references to related applications

[0001] This application claims priority to Chinese Patent Application No. 202411045999.1, entitled “Battery Device and Power Consumption Device”, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

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

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

[0004] Improving the 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 individual battery cells.

[0006] In a first aspect, this application provides a battery device, which includes a housing, battery cells, and a protective plate, wherein the battery cells are disposed within the housing. The protective plate is disposed outside the housing and includes a first fiber resin layer, a reinforcing layer, a buffer layer, and a second fiber resin layer, wherein the reinforcing layer and the buffer layer are located between the first fiber resin layer and the second fiber resin layer. The reinforcing layer has a first surface and a second surface disposed opposite to each other along its thickness direction, and at least a portion of the first surface and at least a portion of the second surface are connected to the buffer layer.

[0007] In the technical solution of this application embodiment, at least one side of the reinforcing layer is connected to the buffer layer, making the sandwich connection between the reinforcing layer and the buffer layer tighter, which is beneficial to improving the overall structural strength of the protective plate, and thus beneficial to improving the reliability of the battery device.

[0008] In one or more embodiments of the first aspect, the reinforcing layer includes a body and a protrusion, the protrusion being formed on one side along the thickness direction of the body, the protrusion including a top wall and a side wall, the side wall connecting the top wall and the body, and at least a portion of the first and second surfaces of the side wall being connected to the buffer layer.

[0009] In the above design, the protrusion provides space around it for the rest of the reinforcing layer to deform. When the protective plate is impacted, the deformation of the protrusion can absorb some energy, reducing the impact force on the battery cells. Simultaneously, a deformable space is formed between the top and side walls, significantly enhancing the protective plate's ability to resist external forces.

[0010] In one or more embodiments of the first aspect, the top wall is connected to the first fiber resin layer, and the body is connected to the second fiber resin layer; or, the top wall is connected to the first fiber resin layer, and both the first surface and the second surface of the body are connected to the buffer layer; or, the body is connected to the second fiber resin layer, and both the first surface and the second surface of the top wall are connected to the buffer layer; or, both the first surface and the second surface of the top wall are connected to the buffer layer, and both the first surface and the second surface of the body are connected to the buffer layer.

[0011] In the above scheme, the protrusion has multiple installation positions, making the assembly of the protective plate more flexible and easier.

[0012] 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 first direction being a direction perpendicular to the large surface of the battery cells, and the protrusion extending along the first direction.

[0013] In the above solution, the extension direction of the protrusion is consistent with the arrangement direction of multiple battery cells in the same battery cell assembly, which simplifies the assembly difficulty of the protective plate.

[0014] In one or more embodiments of the first aspect, the orthographic projection of the protrusion at least partially overlaps with the orthographic projection of the battery cell assembly in the same projection plane perpendicular to the thickness direction of the protective plate.

[0015] In the above scheme, the impact load brought by external force can be evenly distributed and partially released by the protrusion before being transferred to the battery cell assembly, which reduces the risk of excessive deformation of the battery cell and helps to improve the reliability of the battery device.

[0016] In one or more embodiments of the first aspect, the battery cell has two opposite sides along a second direction, the second direction, the first direction, and the thickness direction of the protective plate are perpendicular to each other; protrusions 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 projection of the protrusions at least partially overlaps with the orthographic projection of the sides.

[0017] In the above scheme, the external force will first be transmitted to the side of the battery cell with higher structural strength, which helps to reduce the risk of excessive deformation of the battery cell.

[0018] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projections of the same side of a plurality of battery cells in the battery cell assembly at least partially overlap with the orthographic projection of the same protrusion.

[0019] In the above scheme, after the external force is transmitted from the protrusion to the inside of the box, it will be distributed among the sides with higher structural strength of the multiple battery cells in the same battery cell assembly, further reducing the risk of excessive deformation of a certain battery cell in the same battery cell assembly.

[0020] 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 projections of two adjacent battery cell assemblies at least partially overlap with the orthographic projections of the same protrusion.

[0021] 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 protrusion, the external force, after being transmitted from the protrusion to the inside of the housing, 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.

[0022] In one or more embodiments of the first aspect, the size of the protrusion is equal to the size of the reinforcing layer in the first direction.

[0023] In the above scheme, since the size of the protrusion is equal to the size of the reinforcing layer, the design and processing of the protrusion are less difficult, and the manufacturing cost of the reinforcing layer is lower.

[0024] In one or more embodiments of the first aspect, the angle between the top wall and the side wall is an obtuse angle.

[0025] In the above scheme, since the angle between the top wall and the side wall is an obtuse angle, when the impact force is transmitted to the side wall, part of the impact force will be decomposed and transmitted to the buffer layer. This reduces the risk of excessive impact force being transmitted along the side wall to the inside of the box, causing excessive deformation of the battery cells, which is beneficial to improving the reliability of the battery.

[0026] In one or more embodiments of the first aspect, the reinforcing layer is configured as a flat plate, the first surface of which and the second surface of which are connected to the buffer layer.

[0027] In the above scheme, the flat reinforcing layer enables the sandwich formed by the reinforcing layer and the buffer layer to have high structural strength while also taking into account low production costs.

[0028] In one or more embodiments of the first aspect, the first fiber resin layer is located on the side of the second fiber resin layer facing the housing, the second fiber resin layer includes a fourth connecting portion and a fifth connecting portion, the fifth connecting portion protrudes relative to the fourth connecting portion in a direction away from the first fiber resin layer, and the fifth connecting portion is connected to at least one of the buffer layer and the reinforcing layer.

[0029] In the above solution, a protective plate with a concave-convex structure can be formed by molding.

[0030] In one or more embodiments of the first aspect, the fourth connecting portion is connected to the first fiber resin layer; or the reinforcing layer further includes the first connecting portion, the first surface of the first connecting portion is connected to the first fiber resin layer, and the second surface of the first connecting portion is connected to the fourth connecting portion.

[0031] In the above scheme, since the fourth connecting part is connected to the first fiber resin layer, the assembly difficulty of the protective plate is relatively low. Alternatively, the second surface of the first connecting part is connected to the fourth connecting part, which can make the connection stability between the protective plate and the box body higher when the protective plate is connected to the box body through the position where the first connecting part is set.

[0032] In one or more embodiments of the first aspect, the protective plate further includes a reinforcing member located on the side of the fourth connection portion opposite to the first fiber resin layer.

[0033] In the above scheme, the addition of reinforcing components can further enhance the structural strength of the protective plate. At the same time, the protective plate can be processed into a flat plate through extrusion molding, which is beneficial to improving the production efficiency of the protective plate.

[0034] In one or more embodiments of the first aspect, the side of the reinforcing member opposite to the fourth connecting portion is flush with the side of the fifth connecting portion opposite to the first fiber resin layer.

[0035] The above solution helps reduce the risk of stress concentration between the reinforcing member and the second fiber resin layer.

[0036] In one or more embodiments of the first aspect, the reinforcing member is a frame structure, and the reinforcing member is arranged around the fifth connecting portion.

[0037] 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.

[0038] 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.

[0039] In one or more embodiments of the first aspect, the reinforcing member comprises multiple layers of first fiber-reinforced prepreg.

[0040] 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.

[0041] In one or more embodiments of the first aspect, the size of the reinforcing member along the thickness direction of the protective plate is H1, satisfying: 5.5mm≤H1≤8mm.

[0042] In the above scheme, when H1≥5.5mm, the reinforcing member has sufficient thickness, which is beneficial to the protective plate having high structural strength; when H1≤8mm, the space occupied by the reinforcing member is small, and the battery device has high energy density; therefore, when 5.5mm≤H1≤8mm, the protective plate can achieve both high reliability and high energy density.

[0043] In one or more embodiments of the first aspect, the protective plate is provided with a plurality of mounting holes, which pass through the first fiber resin layer, the fourth connecting portion and the reinforcing member in sequence.

[0044] 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.

[0045] In one or more embodiments of the first aspect, a plurality of fifth connecting portions are provided, the plurality of fifth connecting portions are spaced apart, a plurality of buffer layers are provided, the plurality of buffer layers correspond one-to-one with the plurality of fifth connecting portions, and some mounting holes are provided between two adjacent fifth connecting portions.

[0046] In the above scheme, the fastener set in the second mounting hole can share part of the space with the fifth connecting part, which is beneficial to improving the energy density of the battery device.

[0047] In one or more embodiments of the first aspect, the box body includes a beam body, and the mounting holes are located within the orthographic projection of the beam body in the same projection plane perpendicular to the thickness direction of the protective plate.

[0048] In the above scheme, the fasteners, after passing through the mounting holes and connecting to the beam, do not occupy the space inside the housing used for arranging individual battery cells, which is beneficial to improving the energy density of the battery device. At the same time, the beam generally has higher structural strength than other walls of the housing, which helps improve the connection stability between the protective plate and the housing.

[0049] 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 fourth connection away from the battery cell, and along the thickness direction of the protective plate, the head not extending beyond the surface of the fifth connection away from the battery cell.

[0050] In the above scheme, since the head does not extend beyond the surface of the fifth connection part away from the battery cell, the risk of external force acting directly on the fastener is low, and the risk of fastener damage is low. This is conducive to maintaining a tighter connection between the protective plate and the housing, thereby enabling the battery device to have higher structural stability and reliability.

[0051] In one or more embodiments of the first aspect, the protective plate further includes an edge sealing portion, and the reinforcing layer further has an outer peripheral surface connecting the first surface and the second surface, wherein the edge sealing portion is disposed on a portion of the outer peripheral surface and connects the first fiber resin layer and the second fiber resin layer.

[0052] In the above scheme, the sealing edge can reduce the risk of corrosion of the exposed reinforcement layer, which is beneficial to improving the reliability of the battery device.

[0053] In one or more embodiments of the first aspect, the edge sealing material includes resin.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In one or more embodiments of the first aspect, the first fiber resin layer comprises multiple layers of second fiber-reinforced prepreg; and / or, the second fiber resin layer comprises multiple layers of third fiber-reinforced prepreg.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In one or more embodiments of the first aspect, the thickness of the second fiber resin layer is H2, satisfying: 0.6mm≤H2≤2mm; and / or, the thickness of the first fiber resin layer is H3, satisfying: 0.4mm≤H3≤1.5mm; and / or, along the thickness direction of the protective plate, the size of the reinforcing layer is H4, satisfying: 5mm≤H4≤12mm.

[0062] In the above scheme, when H2≥0.6mm, the second fiber resin layer has a large thickness and a strong ability to resist the impact of gravel; when H2≤2mm, the space occupied by the second fiber resin layer is small, and the battery device has a high energy density; therefore, when 0.6mm≤H2≤2mm, while the second fiber resin layer has a strong ability to resist the impact of gravel, the battery device can also have a high energy density.

[0063] When H3 ≥ 0.4 mm, the first fiber resin layer has a strong ability to uniformly distribute load, which can weaken the impact force transmitted to the battery cell; when H3 ≤ 1.5 mm, the space occupied by the first fiber resin layer is small, and the battery has a high energy density; therefore, when 0.4 mm ≤ H3 ≤ 1.5 mm, the first fiber resin layer has a strong ability to uniformly distribute load, and the battery can also have a high energy density.

[0064] When H4 ≥ 0.3 mm, the reinforcing layer has a large thickness, and the protective plate has high structural strength; when H4 ≤ 1.2 mm, the reinforcing layer occupies less space, and the battery device has high energy density; therefore, when 0.3 mm ≤ H4 ≤ 1.2 mm, the battery device can balance high structural strength and energy density.

[0065] Secondly, this application provides an electrical device that includes the battery device in one or more embodiments of the first aspect, the battery device being used to provide electrical energy.

[0066] In the above solution, since the battery device in one or more embodiments of the first aspect has high reliability, the power supply device including the battery device in one or more embodiments of the first aspect also has high reliability.

[0067] 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

[0068] 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:

[0069] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0070] Figure 2 is an exploded view of a battery device according to some embodiments of this application;

[0071] Figure 3 is a cross-sectional view of a protective plate according to some embodiments of this application;

[0072] Figure 4 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0073] Figure 5 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0074] Figure 6 is a cross-sectional view of a protective plate according to some embodiments of this application;

[0075] Figure 7 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0076] Figure 8 is a cross-sectional view of the reinforcement layer in some embodiments of this application;

[0077] Figure 9 is a schematic diagram of the structure of the enhancement layer in some embodiments of this application.

[0078] The reference numerals in the detailed embodiments are as follows:

[0079] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 113 - Beam; 12 - Battery Cell; 121 - Side; 13 - Protective Plate; 131 - First Fiber Resin Layer; 132 - Second Fiber Resin Layer; 1321 - Fourth Connecting Part; 1322 - Fifth Connecting Part; 133 - Buffer Layer; 134 - Reinforcing Layer; 1340 - Body; 1341 - First Surface; 1342 - Second Surface; 1343 - Side Wall; 1344 - Top Wall; 1345 - First Connecting Part; 135 - Reinforcing Member; 136 - Edge Sealing Part; 137 - Mounting Hole; 138 - Fastener; 1381 - Head; 1382 - Rod Part; X - First Direction; Y - Second Direction. Detailed Implementation

[0080] 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.

[0081] 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.

[0082] In high-power applications such as electric vehicles, battery devices are used at three levels: individual battery cells, battery modules, and battery packs. A battery module is formed by electrically connecting a number of individual battery cells and placing them in a frame to protect them from external shocks, heat, and vibration. A battery pack refers to the final state of the battery system installed in an electric vehicle. The battery pack mentioned in the embodiments of this application refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. A battery pack generally includes a housing for encapsulating one or more individual battery cells. The housing reduces the risk of liquids or other foreign matter affecting the charging or discharging of the individual battery cells.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0088] 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.

[0089] In a typical battery cell structure, a battery cell includes a casing, electrode assemblies, and electrolyte. The casing includes end caps and a housing; the end caps close the openings of the housing to define a space for accommodating the electrode assemblies.

[0090] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0091] The outer side of the battery pack casing is fitted with a protective plate to mitigate impact forces and protect the individual battery cells from damage. The protective plate typically includes a cushioning layer for energy absorption during collapse and a reinforcing layer to enhance its structural strength, all encased in a fiber resin layer to form a single plate. In practice, the reinforcing and cushioning layers of the protective plate are often stacked, resulting in a relatively loose connection and poor structural stability. Excessive deformation can easily cause the connection between the protective plate and the casing to fail, leading to low reliability.

[0092] In view of this, this application provides a battery device, which includes a housing, battery cells, and a protective plate, with the battery cells disposed within the housing. The protective plate is disposed outside the housing and includes a first fiber resin layer, a reinforcing layer, a buffer layer, and a second fiber resin layer, with the reinforcing layer and the buffer layer located between the first and second fiber resin layers. The reinforcing layer has a first surface and a second surface disposed opposite to each other along its thickness direction, with at least a portion of the first surface and at least a portion of the second surface connected to the buffer layer. At least one side of the reinforcing layer is connected to the buffer layer, resulting in a tighter interlayer connection between the reinforcing layer and the buffer layer, which improves the overall structural strength of the protective plate and thus enhances the reliability of the battery device.

[0093] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0094] 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.

[0095] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0096] 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.

[0097] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or in a mixed configuration. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 12 can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules can be connected in series, parallel, or in a mixed configuration to form the battery device 100. That is, the multiple battery cells 12 can directly form the battery device 100, or they can first be formed into battery modules, and then the battery modules can be combined to form the battery device 100.

[0098] 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.

[0099] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar component can realize electrical connection between battery cells 12 by connecting the electrode terminals of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the housing 11 via a conductive mechanism.

[0100] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery module. The number of battery cells 12 included in a battery module is unlimited and can be set according to requirements. The battery device 100 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0101] According to some embodiments of this application, referring to Figures 3-6, this application provides a battery device 100. The battery device 100 includes a housing 11, a battery cell 12, and a protective plate 13. The battery cell 12 is disposed inside the housing 11. The protective plate 13 is disposed outside the housing 11 and includes a first fiber resin layer 131, a reinforcing layer 134, a buffer layer 133, and a second fiber resin layer 132. The reinforcing layer 134 and the buffer layer 133 are located between the first fiber resin layer 131 and the second fiber resin layer 132. The reinforcing layer 134 has a first surface 1341 and a second surface 1342 disposed opposite to each other along its thickness direction, and at least a portion of the first surface 1341 and at least a portion of the second surface 1342 are connected to the buffer layer 133.

[0102] In some embodiments, the protective plate 13 may be disposed on any side of the exterior of the housing 11, such as the bottom or side 121 of the housing 11. Taking the vehicle 1000 as an example, the bottom of the housing 11 may refer to the side of the housing 11 closest to the ground after the battery device 100 is installed in the vehicle 1000.

[0103] In some embodiments, the thickness direction of the protective plate 13 is parallel to the direction of gravity.

[0104] In some embodiments, the second fiber resin layer 132 is closer to the ground than the first fiber resin layer 131.

[0105] The reinforcing layer 134 can be connected to the first fiber resin layer 131 and the second fiber resin layer 132 by structural adhesive or by the adhesive properties of their resin portions.

[0106] In some embodiments, the reinforcing layer 134 is made of metal.

[0107] The provision of the second fiber resin layer 132 can reduce the risk that the reinforcing layer 134 will be exposed to air or other environments and corroded due to foreign objects scraping one side of the protective plate 13 in the thickness direction.

[0108] Before the impact force is transmitted from the first fiber resin layer 131 to the reinforcing layer 134 and before it is transmitted to the housing 11, the second fiber resin layer 132 can evenly distribute the impact load and reduce the risk of excessive deformation of the battery cells 12 inside the housing 11 due to the impact force.

[0109] 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.

[0110] In some embodiments, the first fiber resin layer 131 and / or the second fiber resin layer 132 cover the reinforcing layer 134 on the side 121 of the second direction Y, which intersects the thickness direction of the protective plate 13.

[0111] In some embodiments, referring to Figures 8 and 9, the reinforcing layer 134 includes a body and a protrusion. The protrusion includes a shell. The body has a through hole, and the shell surrounds the through hole to form a recess. The shell may be hemispherical.

[0112] Since at least a portion of the first surface 1341 and at least a portion of the second surface 1342 are connected to the buffer layer 133, it means that at least one side of the reinforcing layer 134 is connected to the buffer layer 133, making the interlayer connection between the reinforcing layer 134 and the buffer layer 133 more compact.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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".

[0120] In the technical solution of this application embodiment, at least one side of the reinforcing layer 134 is connected to the buffer layer 133, so that the sandwich connection formed by the reinforcing layer 134 and the buffer layer 133 is tighter, which is beneficial to improving the overall structural strength of the protective plate 13, and thus beneficial to improving the reliability of the battery device 100.

[0121] According to some embodiments of this application, referring to Figures 3-5, the reinforcing layer 134 includes a body 1340 and a protrusion. A protrusion is formed on one side along the thickness direction of the body 1340. The protrusion includes a top wall 1344 and a side wall 1343. The side wall 1343 connects the top wall 1344 and the body 1340. At least a portion of the first surface 1341 and the second surface 1342 of the side wall 1343 are connected to the buffer layer 133.

[0122] A cavity is formed between the top wall 1344 and the side wall 1343, and part of the buffer layer 133 is placed inside the cavity. There is a certain amount of deformation space both inside and outside the cavity.

[0123] In the above scheme, the protrusion provides space around it for the rest of the reinforcing layer 134 to deform. When the protective plate 13 is impacted, the deformation of the protrusion can absorb some energy, thus weakening the impact force on the battery cell 12. At the same time, a deformable space is also formed between the top wall 1344 and the side wall 1343, which significantly enhances the protective plate 13's ability to resist external forces.

[0124] According to some embodiments of this application, the top wall 1344 is connected to the first fiber resin layer 131, and the body 1340 is connected to the second fiber resin layer 132; or, the top wall 1344 is connected to the first fiber resin layer 131, and both the first surface 1341 and the second surface 1342 of the body 1340 are connected to the buffer layer 133; or, the body 1340 is connected to the second fiber resin layer 132, and both the first surface 1341 and the second surface 1342 of the top wall 1344 are connected to the buffer layer 133; or, both the first surface 1341 and the second surface 1342 of the top wall 1344 are connected to the buffer layer 133, and both the first surface 1341 and the second surface 1342 of the body 1340 are connected to the buffer layer 133.

[0125] The top wall 1344 is connected to the first fiber resin layer 131, and the body 1340 is connected to the second fiber resin layer 132, which means that the top wall 1344 and the body 1340 are exposed to the buffer layer 133.

[0126] The top wall 1344 is connected to the first fiber resin layer 131. The first surface 1341 and the second surface 1342 of the body 1340 are both connected to the buffer layer 133, which means that the top wall 1344 is exposed to the buffer layer 133 and the body 1340 is located inside the buffer layer 133.

[0127] The main body 1340 is connected to the second fiber resin layer 132. The first surface 1341 and the second surface 1342 of the top wall 1344 are both connected to the buffer layer 133, which means that the top wall 1344 is located inside the buffer layer 133, and the main body 1340 is exposed to the buffer layer 133.

[0128] The first surface 1341 and the second surface 1342 of the top wall 1344 are both connected to the buffer layer 133, and the first surface 1341 and the second surface 1342 of the body 1340 are both connected to the buffer layer 133, which means that the body 1340 and the top wall 1344 are disposed within the buffer layer 133.

[0129] In the above scheme, the protrusion has multiple installation positions, making the assembly of the protective plate 13 more flexible and easier.

[0130] According to some embodiments of this application, the battery device 100 includes at least one battery cell 12 assembly, the battery cell 12 assembly includes a plurality of battery cells 12 stacked along a first direction X, the first direction X being a direction perpendicular to the large surface of the battery cell 12, and the protrusions extending along the first direction X.

[0131] The outer casing of the battery cell 12 generally has multiple surfaces. The large surface of the battery cell 12 refers to the surface with the largest area in the battery cell 12, and the above surface generally overlaps with the surface with the largest area of ​​the electrode assembly.

[0132] In the above scheme, the extension direction of the protrusion is consistent with the arrangement direction of multiple battery cells 12 in the same battery cell 12 assembly, which simplifies the assembly difficulty of the protective plate 13.

[0133] According to some embodiments of this application, please refer to FIG5. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of the protrusion at least partially overlaps with the orthographic projection of the battery cell 12 assembly.

[0134] In some embodiments, a plurality of battery cells 12 in a battery cell 12 assembly correspond to a protrusion.

[0135] In some embodiments, a plurality of battery cells 12 in the battery cell 12 assembly each correspond to a protrusion.

[0136] In some embodiments, the battery cell 12 in the battery cell 12 assembly corresponds to a plurality of protrusions.

[0137] In the above scheme, the impact load brought by the external force can be evenly distributed and partially released by the protrusion before being transferred to the battery cell 12 assembly, which reduces the risk of excessive deformation of the battery cell 12 and helps to improve the reliability of the battery device 100.

[0138] According to some embodiments of this application, please refer to FIG5. The battery cell 12 has two opposite sides 121 along the second direction Y. The second direction Y, the first direction X and the thickness direction of the protective plate 13 are perpendicular to each other. Protrusions are respectively provided on the protective plate 13 at positions corresponding to the sides 121. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of the protrusions at least partially overlaps with the orthographic projection of the sides 121.

[0139] Each battery cell 12 has two opposing sides 121 along the second direction Y. These sides 121 are located at the shoulders of the battery cell 12. In a square battery cell 12, the two ends along the length of the battery cell 12 can be referred to as the shoulders of the battery cell 12. The edges at the two ends along the length of the battery cell 12 are relatively short and connected to the apex of the outer casing, thus exhibiting strong resistance to deformation. In other words, the shoulder structure of the battery cell 12 has strong structural strength. Since the orthographic projections of the same side 121 of multiple battery cells 12 in the battery cell assembly at least partially overlap with each other, external forces will first be transmitted to the side 121 of the battery cell 12 with higher structural strength.

[0140] In the above scheme, the external force will first be transmitted to the side 121 of the battery cell 12 with higher structural strength, which helps to reduce the risk of excessive deformation of the battery cell 12.

[0141] According to some embodiments of this application, please refer to FIG5. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of the side surface 121 of the same side of a plurality of battery cells 12 in the battery cell 12 assembly at least partially overlaps with the orthographic projection of the same protrusion.

[0142] In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projection of the side 121 of the same side of multiple battery cells 12 in the battery cell 12 assembly at least partially overlaps with the orthographic projection of the same protrusion. This means that after the external force is evenly distributed through the reinforcing strip, it will be dispersed to the shoulders of different battery cells 12 in the same battery cell 12 assembly, which can further disperse the external force and reduce the external force acting on a single battery cell 12.

[0143] In the above scheme, after the external force is transmitted from the protrusion to the inside of the housing 11, it will be distributed by the side 121 with higher structural strength among the multiple battery cells 12 in the same battery cell 12 assembly, further reducing the risk of excessive deformation of a certain battery cell 12 in the same battery cell 12 assembly.

[0144] According to some embodiments of this application, please refer to FIG5. A plurality of battery cell 12 assemblies are provided, and the plurality of battery cell 12 assemblies are arranged along the second direction Y. In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projections of two adjacent battery cell 12 assemblies at least partially overlap with the orthographic projections of the same protrusion.

[0145] In the same projection plane perpendicular to the thickness direction of the protective plate 13, the orthographic projections of two adjacent battery cells 12 modules overlap at least partially with the orthographic projection of the same protrusion. This means that after the external force is evenly distributed through the protrusion, it will be dispersed to the shoulders of different battery cells 12 in different battery cell 12 modules, which can further disperse the external force and reduce the external force acting on a single battery cell 12.

[0146] In the above scheme, since the orthographic projections of two adjacent battery cells 12 modules overlap at least partially with the orthographic projections of the same protrusion, the external force, after being transmitted from the protrusion to the inside of the housing 11, will be distributed by the side 121 with higher structural strength among the battery cells 12 of the two adjacent battery cells 12 modules, further reducing the risk of excessive deformation of a certain battery cell 12 in the same battery cell 12 module.

[0147] According to some embodiments of this application, in the first direction X, the size of the protrusion is equal to the size of the reinforcing layer 134.

[0148] Since the dimensions of the protrusion are equal to those of the reinforcing layer 134 in the first direction X, taking stamping as an example, the protrusion only needs to be processed with a stamping head that is wider than the reinforcing layer 134, without requiring special design of the stamping head's dimensions. Similarly, in machining, the tool's trajectory in the first direction X only needs to cover the dimensions of the reinforcing layer 134, without requiring special design of the tool's trajectory.

[0149] In some embodiments, the first direction X is the left and right direction of the vehicle 1000. The battery device 100 is also at relatively high risk of being impacted by the side 121 in the first direction X. Since the size of the protrusion is equal to the size of the reinforcing layer 134 and the protrusion extends to the edge of the reinforcing layer 134 in the first direction X, the protrusion acts as a "reinforcing rib" when impacted by the side 121, which can make the reinforcing layer 134 have high structural stability after being impacted.

[0150] In the above scheme, since the size of the protrusion is equal to the size of the reinforcing layer 134, the design and processing of the protrusion are less difficult, and the manufacturing cost of the reinforcing layer 134 is lower.

[0151] According to some embodiments of this application, please refer to Figures 4-5, the angle between the top wall 1344 and the side wall 1343 is an obtuse angle.

[0152] The angle between the top wall 1344 and the side wall 1343 is an obtuse angle, which can be described as the side wall 1343 being inclined relative to the top wall 1344. In some embodiments, the side wall 1343 is inclined relative to the thickness direction of the reinforcing layer 134.

[0153] When the protective plate 13 is subjected to an impact force transmitted from the thickness direction of the reinforcing layer 134, a component force in the second direction Y will be generated during the transmission of the impact force along the side wall 1343, which reduces the force transmitted to the inside of the housing 11 along the thickness direction of the reinforcing layer 134, thereby weakening the impact of the impact force on the battery cell 12.

[0154] In the above scheme, since the angle between the top wall 1344 and the side wall 1343 is an obtuse angle, when the impact force is transmitted to the side wall 1343, part of the impact force will be decomposed and transmitted to the buffer layer 133, reducing the risk of excessive impact force being transmitted along the side wall 1343 to the inside of the box 11, causing excessive deformation of the battery cell 12, which is beneficial to improving the reliability of the battery device 100.

[0155] According to some embodiments of this application, please refer to FIG6, the reinforcing layer 134 is configured as a plate, and the first surface 1341 and the second surface 1342 of the plate are both connected to the buffer layer 133.

[0156] The edge of the plate can extend beyond the buffer layer 133, or the plate can be placed inside the buffer layer 133.

[0157] In the above scheme, the flat reinforcing layer 134 enables the sandwich formed by the reinforcing layer 134 and the buffer layer 133 to have high structural strength while also taking into account low production costs.

[0158] According to some embodiments of this application, please refer to FIG4. The first fiber resin layer 131 is located on the side of the second fiber resin layer 132 facing the housing 11. The second fiber resin layer 132 includes a fourth connecting portion 1321 and a fifth connecting portion 1322. The fifth connecting portion 1322 protrudes away from the first fiber resin layer 131 relative to the fourth connecting portion 1321. The fifth connecting portion 1322 is connected to at least one of the buffer layer 133 and the reinforcing layer 134.

[0159] In some embodiments, the fifth connecting portion 1322 is a protrusion that protrudes from the fourth connecting portion 1321, and a recess is formed on the side of the protrusion away from the second fiber resin layer 132, and the buffer layer 133 and the reinforcing layer 134 are received in the recess.

[0160] In the above scheme, a protective plate 13 with a concave-convex structure can be formed by molding process.

[0161] According to some embodiments of this application, please refer to FIG4, the fourth connecting portion 1321 is connected to the first fiber resin layer 131; or the reinforcing layer 134 further includes a first connecting portion 1345, the first surface 1341 of the first connecting portion 1345 is connected to the first fiber resin layer 131, and the second surface 1342 of the first connecting portion 1345 is connected to the fourth connecting portion 1321.

[0162] In some embodiments, when the fourth connecting portion 1321 is connected to the first fiber resin layer 131, taking the connection of the protective plate 13 and the housing 11 by the fastener 138 as an example, the fastener 138 passes through the protective plate 13 and is connected to the housing 11 with relatively low difficulty. Similarly, if welding or other methods are used, the connection between the protective plate 13 and the housing 11 is also relatively easy.

[0163] In some embodiments, when the second surface 1342 of the first connecting portion 1345 is connected to the fourth connecting portion 1321, taking the connection of the protective plate 13 and the housing 11 by the fastener 138 as an example, the risk of torque attenuation of the fastener 138 is low. Similarly, if welding or other methods are used, the connection between the protective plate 13 and the housing 11 is relatively easy, and the strength of the weld after the protective plate 13 and the housing 11 form a weld mark is relatively high.

[0164] In the above scheme, since the fourth connecting part 1321 is connected to the first fiber resin layer 131, the assembly difficulty of the protective plate 13 is relatively low. Alternatively, the second surface 1342 of the first connecting part 1345 is connected to the fourth connecting part 1321, which can make the connection stability between the protective plate 13 and the box 11 higher when the protective plate 13 is connected to the box 11 through the position where the first connecting part 1345 is set.

[0165] According to some embodiments of this application, referring to FIG4, the protective plate 13 further includes a reinforcing member 135, which is located on the side of the fourth connection portion 1321 opposite to the first fiber resin layer 131.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] According to some embodiments of this application, please refer to FIG4, the side of the reinforcing member 135 opposite to the fourth connecting portion 1321 is flush with the side of the fifth connecting portion 1322 opposite to the first fiber resin layer 131.

[0172] The side of the reinforcing member 135 facing away from the fourth connecting part 1321 is flush with the side of the fifth connecting part 1322 facing away from the first fiber resin layer 131. This means that when external force is transmitted to the side of the reinforcing member 135 facing away from the fourth connecting part 1321, it can be diffused more evenly, and the risk of stress concentration is lower.

[0173] The above solution helps to reduce the risk of stress concentration between the reinforcing member 135 and the second fiber resin layer 132.

[0174] According to some embodiments of this application, please refer to FIG4. The reinforcing member 135 is a frame structure, and the reinforcing member 135 is arranged around the fifth connecting part 1322.

[0175] The reinforcing member 135 is arranged around the fifth connecting part 1322, which means that the reinforcing member 135 and the fifth connecting part 1322 share a portion of space.

[0176] In the above scheme, the reinforcing member 135 and the fifth connecting part 1322 share a portion of space, which is beneficial to improving the energy density of the battery device 100.

[0177] 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.

[0178] According to some embodiments of this application, the reinforcing member 135 includes multiple layers of first fiber-reinforced prepreg.

[0179] 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.

[0180] According to some embodiments of this application, please refer to FIG4. Along the thickness direction of the protective plate 13, the size of the reinforcing member 135 is H1, which satisfies: 5.5mm≤H1≤8mm.

[0181] Along the thickness direction of the protective plate 13, the size of the reinforcing member 135 can be any value greater than or equal to 5.5 mm and less than or equal to 8 mm, such as 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, etc.

[0182] In the above scheme, when H1≥5.5mm, the reinforcing member 135 has sufficient thickness, which is beneficial to the protective plate 13 having high structural strength; when H1≤8mm, the space occupied by the reinforcing member 135 is small, and the battery device 100 has high energy density; therefore, when 5.5mm≤H1≤8mm, the protective plate 13 can take into account both high reliability and high energy density.

[0183] According to some embodiments of this application, please refer to FIG7. The protective plate 13 is provided with a plurality of mounting holes 137, which pass through the first fiber resin layer 131, the fourth connecting part 1321 and the reinforcing member 135 in sequence.

[0184] The fastener 138 may protrude from the reinforcement 135 or be partially housed within the reinforcement 135. That is, in some embodiments, the head 1381 of the fastener 138 does not extend beyond the fifth connection portion 1322 away from the surface of the battery cell 12, nor does it extend beyond the surface of the reinforcement 135 away from the surface of the battery cell 12.

[0185] 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.

[0186] According to some embodiments of this application, please refer to FIG7. A plurality of fifth connecting portions 1322 are provided, and the plurality of fifth connecting portions 1322 are spaced apart. A plurality of buffer layers 133 are provided, and the plurality of buffer layers 133 correspond one-to-one with the plurality of fifth connecting portions 1322. Some mounting holes 137 are provided between two adjacent fifth connecting portions 1322.

[0187] The fact that some of the second mounting holes 137 are located between two adjacent fifth connecting portions 1322 means that the fasteners 138 located in the second mounting holes 137 can share some space with the fifth connecting portions 1322.

[0188] In the above scheme, the fastener 138 set in the second mounting hole 137 can share part of the space with the fifth connecting part 1322, which is beneficial to improving the energy density of the battery device 100.

[0189] According to some embodiments of this application, please refer to FIG7, the box body 11 includes a beam 113, and the mounting hole 137 is located in the orthographic projection of the beam 113 in the same projection plane perpendicular to the thickness direction of the protective plate 13.

[0190] The beam 113 can be an inherent horizontal or longitudinal beam inside the box 11, or it can be a suspended beam outside the box 11.

[0191] In the above scheme, the fastener 138 passes through the mounting hole 137 and is connected to the beam 113 without occupying the space inside the housing 11 used for arranging the battery cells 12, which is beneficial to improving the energy density of the battery device 100. At the same time, the beam 113 generally has higher structural strength than other walls of the housing 11, which is beneficial to improving the connection stability between the protective plate 13 and the housing 11.

[0192] According to some embodiments of this application, referring to FIG7, the battery device 100 further includes a fastener 138, which 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 fourth connecting portion 1321 away from the battery cell 12. Along the thickness direction of the protective plate 13, the head 1381 does not extend beyond the surface of the fifth connecting portion 1322 away from the battery cell 12.

[0193] Fastener 138 can be self-tapping screws, bolts, nuts, screws, rivets, etc.

[0194] The number of fasteners 138 can be one or more.

[0195] The fastener 138 may pass through the housing 11 first and then through the first fiber resin layer 131, or it may pass through the first fiber resin layer 131 first and then enter the housing 11. For example, in some embodiments, the housing 11 includes a base plate and a frame, and the fastener 138 can be fastened to the frame. In other embodiments, the housing 11 also includes a flange portion surrounding the frame, and the fastener 138 can pass through the flange portion to connect to the protective plate 13.

[0196] 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.

[0197] In the above scheme, since the head 1381 does not extend beyond the fifth connecting part 1322 away from the surface of the battery cell 12, the risk of external force directly acting on the fastener 138 is low, and the risk of damage to the fastener 138 is low. This is conducive to maintaining a tighter connection between the protective plate 13 and the housing 11, thereby enabling the battery device 100 to have higher structural stability and reliability.

[0198] According to some embodiments of this application, please refer to FIG7, the protective plate 13 further includes an edge sealing portion 136, and the reinforcing layer 134 further has an outer peripheral surface connecting the first surface 1341 and the second surface 1342. The edge sealing portion 136 is disposed on a portion of the outer peripheral surface and connects the first fiber resin layer 131 and the second fiber resin layer 132.

[0199] 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 coated.

[0200] In the above scheme, the sealing part 136 can reduce the risk of the exposed reinforcement layer 134 being corroded, which is beneficial to improving the reliability of the battery device 100.

[0201] According to some embodiments of this application, the edge banding 136 is made of resin.

[0202] Resins can include thermosetting resins, such as epoxy resins, phenolic resins, urea-formaldehyde resins, melamine resins, unsaturated polyester resins, silicone resins, polyurethanes, etc.

[0203] Resins can include thermoplastic resins, such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, etc.

[0204] Of course, resins can also include, but are not limited to, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, etc.

[0205] According to some embodiments of this application, the dimension of the edge sealing portion 136 in the direction perpendicular to the outer peripheral surface is D, which satisfies: 1mm≤D≤10mm.

[0206] The dimension of the edge sealing portion 136 in the direction perpendicular to the outer peripheral surface can be any value greater than or equal to 1 mm and less than or equal to 10 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, etc.

[0207] 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.

[0208] 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.

[0209] According to some embodiments of this application, the first fiber resin layer 131 includes multiple layers of second fiber-reinforced prepreg; and / or, the second fiber resin layer 132 includes multiple layers of third fiber-reinforced prepreg.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] According to some embodiments of this application, referring to FIG4, the thickness of the second fiber resin layer 132 is H2, satisfying: 0.6mm≤H2≤2mm; and / or, the thickness of the first fiber resin layer 131 is H3, satisfying: 0.4mm≤H3≤1.5mm; and / or, along the thickness direction of the protective plate 13, the size of the reinforcing layer 134 is H4, satisfying: 5mm≤H4≤12mm.

[0214] The thickness of the first fiber resin layer 131 can be any value between 0.6 mm and 2 mm, such as 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0215] Along the thickness direction of the protective plate 13, the size of the reinforcing layer 134 can be any value between 5 mm and 12 mm, such as 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, 10.5 mm, 11 mm, 11.5 mm, 12 mm, etc.

[0216] The thickness of the second fiber resin layer 132 can be any value between 0.4 mm and 1.5 mm, such as 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, etc.

[0217] In the above scheme, when H2≥0.6mm, the second fiber resin layer 132 has a large thickness and a strong ability to resist the impact of gravel; when H2≤2mm, the space occupied by the second fiber resin layer 132 is small, and the battery device 100 has a high energy density; therefore, when 0.6mm≤H2≤2mm, while the second fiber resin layer 132 has a strong ability to resist the impact of gravel, the battery device 100 can also have a high energy density.

[0218] When H3 ≥ 0.4 mm, the first fiber resin layer 131 has a strong ability to uniformly distribute load, which can weaken the impact force transmitted to the battery cell 12; when H3 ≤ 1.5 mm, the space occupied by the first fiber resin layer 131 is small, and the battery device 100 has a high energy density; therefore, when 0.4 mm ≤ H3 ≤ 1.5 mm, while the first fiber resin layer 131 has a strong ability to uniformly distribute load, the battery device 100 can also have a high energy density.

[0219] When H4 ≥ 0.3 mm, the reinforcing layer 134 has a large thickness, and the protective plate 13 has high structural strength; when H4 ≤ 1.2 mm, the reinforcing layer 134 occupies less space, and the battery device 100 has high energy density; therefore, when 0.3 mm ≤ H4 ≤ 1.2 mm, the battery device 100 can balance high structural strength and energy density.

[0220] According to some embodiments of this application, please refer to FIG1. ​​This application provides an electrical device, which includes the battery device 100 in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0221] In the above solutions, since the battery device 100 in one or more of the above embodiments has high reliability, the power-consuming device including the battery device 100 in one or more of the above embodiments also has high reliability.

[0222] According to some embodiments of this application, referring to Figures 3-5, this application provides a battery device 100. The battery device 100 includes a housing 11, a battery cell 12, and a protective plate 13. The battery cell 12 is disposed inside the housing 11. The protective plate 13 is disposed outside the housing 11 and includes a first fiber resin layer 131, a reinforcing layer 134, a buffer layer 133, and a second fiber resin layer 132. The reinforcing layer 134 and the buffer layer 133 are located between the first fiber resin layer 131 and the second fiber resin layer 132. The reinforcing layer 134 has a first surface 1341 and a second surface 1342 disposed opposite to each other along its thickness direction, and at least a portion of the first surface 1341 and at least a portion of the second surface 1342 are connected to the buffer layer 133. The reinforcing layer 134 includes a body 1340 and a protrusion. The protrusion is formed on one side along the thickness direction of the body 1340. The protrusion includes a top wall 1344 and a side wall 1343. The side wall 1343 connects the top wall 1344 and the body 1340. At least a portion of the first surface 1341 and the second surface 1342 of the side wall 1343 are connected to the buffer layer 133. The top wall 1344 is connected to the first fiber resin layer 131, and the body 1340 is connected to the second fiber resin layer 132. The angle between the top wall 1344 and the side wall 1343 is an obtuse angle. In the first direction X, the size of the protrusion is equal to the size of the reinforcing layer 134.

[0223] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body; a plurality of battery cells arranged in the box body; a protective plate arranged outside the box body, the protective plate comprising a first fiber resin layer, a reinforcing layer, a buffer layer and a second fiber resin layer, the reinforcing layer and the buffer layer being arranged between the first fiber resin layer and the second fiber resin layer; wherein the reinforcing layer has a first surface and a second surface arranged oppositely along the thickness direction of the reinforcing layer, at least part of the first surface and at least part of the second surface are connected with the buffer layer.

2. The battery device according to claim 1, characterized by The reinforcing layer comprises a body and a protruding portion, the protruding portion is formed on one side of the body along the thickness direction of the body, the protruding portion comprises a top wall and a side wall, the side wall connects the top wall and the body, and the first surface and the second surface of at least part of the side wall are connected with the buffer layer.

3. The battery device of claim 2, wherein, The top wall is connected with the first fiber resin layer, and the body is connected with the second fiber resin layer. Alternatively, the top wall is connected with the first fiber resin layer, and the first surface of the body and the second surface of the body are both connected with the buffer layer. Alternatively, the body is connected with the second fiber resin layer, and the first surface of the top wall and the second surface of the top wall are both connected with the buffer layer. Alternatively, the first surface of the top wall and the second surface of the top wall are both connected with the buffer layer, and the first surface of the body and the second surface of the body are both connected with the buffer layer.

4. The battery device according to claim 2 or 3, characterized by The battery device comprises at least one battery cell assembly, the battery cell assembly comprises a plurality of battery cells arranged in a first direction, the first direction is perpendicular to the large face of the battery cell, and the protruding portion extends along the first direction.

5. The battery device of claim 4, wherein In the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the protruding portion at least partially overlaps with the orthographic projection of the battery cell assembly.

6. The battery device of claim 5, wherein The battery cell has two opposite side faces along a second direction, the second direction, the first direction and the thickness direction of the protective plate are perpendicular to each other; The protruding portion is arranged at a position corresponding to the side face on the protective plate, and in the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the protruding portion at least partially overlaps with the orthographic projection of the side face.

7. The battery device of claim 6, wherein In the same projection plane perpendicular to the thickness direction of the protective plate, the orthographic projection of the side face of the same side of the plurality of battery cells in the battery cell assembly at least partially overlaps with the orthographic projection of the same protruding portion.

8. The battery device of claim 7, wherein, A plurality of battery cell assemblies are arranged, and the plurality of battery cell assemblies are arranged along the second direction, and 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 protruding portion.

9. The battery device according to any one of claims 4 to 8, characterized by, In the first direction, the size of the protruding portion is equal to the size of the reinforcing layer.

10. The battery device according to any one of claims 2 to 9, characterized by, The included angle between the top wall and the side wall is obtuse.

11. The battery device of claim 1, wherein The reinforcing layer is arranged as a flat plate, and the first surface of the flat plate and the second surface of the flat plate are both connected with the buffer layer.

12. The battery device according to claim 2 or 11, characterized by The first fiber resin layer is located on a side of the second fiber resin layer facing the box body, the second fiber resin layer comprises a fourth connecting part and a fifth connecting part, the fifth connecting part protrudes away from the first fiber resin layer relative to the fourth connecting part, and the fifth connecting part is connected with at least one of the buffer layer and the reinforcing layer.

13. The battery device of claim 12, wherein, The fourth connecting part is connected with the first fiber resin layer; or the reinforcing layer further comprises a first connecting part, a first surface of the first connecting part is connected with the first fiber resin layer, and a second surface of the first connecting part is connected with the fourth connecting part.

14. The battery device according to claim 12 or 13, characterized by The protective plate further comprises a reinforcing member, and the reinforcing member is located on a side of the fourth connecting part away from the first fiber resin layer.

15. The battery device of claim 14, wherein, A side of the reinforcing member away from the fourth connecting part is flush with a side of the fifth connecting part away from the first fiber resin layer.

16. The battery device according to claim 14 or 15, characterized by The reinforcing member is in a frame structure, and the reinforcing member is arranged around the fifth connecting part.

17. The battery device of any one of claims 14-16, wherein, The material of the reinforcing member is independently selected from a glass fiber reinforced polyamide resin member, a glass fiber reinforced polypropylene resin member, a glass fiber reinforced polyethylene resin member, a glass fiber reinforced polycarbonate resin member, or a glass fiber reinforced polystyrene resin member.

18. The battery device of any one of claims 14-17, wherein, The reinforcing member comprises a plurality of layers of first fiber reinforced prepreg stacked on each other.

19. The battery device of any one of claims 14-18, wherein, In the thickness direction of the protective plate, the size of the reinforcing member is H1, and 5.5mm≤H1≤8mm is satisfied.

20. The battery device of any one of claims 14-19, wherein, The protective plate is provided with a plurality of mounting holes, and the mounting holes pass through the first fiber resin layer, the fourth connecting part and the reinforcing member in sequence.

21. The battery device of claim 20, wherein, The fifth connecting part is provided in plurality, and the plurality of fifth connecting parts are arranged at intervals. The buffer layer is provided in plurality, and the plurality of buffer layers correspond one-to-one to the plurality of fifth connecting parts. Part of the mounting holes are arranged between adjacent two fifth connecting parts.

22. The battery device of claim 21, wherein, The box body comprises a beam body, and in the same projection plane perpendicular to the thickness direction of the protective plate, the mounting holes are located in the projection of the beam body.

23. The battery device of any one of claims 20-22, wherein, The battery device further comprises a fastener, the fastener comprises a head and a rod part, the rod part passes through the mounting hole, and the head is arranged on a side of the fourth connecting part away from the battery monomer. In the thickness direction of the protective plate, the head does not exceed the surface of the fifth connecting part away from the battery monomer.

24. The battery device of claim 13, wherein, The protective plate further comprises an edge sealing part, and the reinforcing layer further has an outer circumferential surface connecting the first surface and the second surface. The edge sealing part is arranged on part of the outer circumferential surface and connects the first fiber resin layer and the second fiber resin layer.

25. The battery device of claim 24, wherein, The material of the edge sealing part comprises resin.

26. The battery device of claim 24 or 25, wherein, The size of the edge sealing part in the direction perpendicular to the outer circumferential surface is D, and 1mm≤D≤10mm is satisfied.

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

28. The battery device of any one of claims 1-27, wherein, The first fiber resin layer comprises a plurality of second fiber reinforced prepregs stacked with each other; And / or, the second fiber resin layer comprises a plurality of third fiber reinforced prepregs stacked with each other.

29. The battery device of any one of claims 1-28, wherein, The material of the buffer layer comprises at least one of basswood, honeycomb, rubber, foamed material and hard polyurethane.

30. The battery device of any one of claims 1-29, wherein, The material of the reinforcing layer comprises at least one of steel, titanium, ceramic and high-strength plastic.

31. The battery device of any one of claims 1-30, wherein, The thickness of the second fiber resin layer is H2, satisfying: 0.6mm≤H2≤2mm; And / or, the thickness of the first fiber resin layer is H3, satisfying: 0.4mm≤H3≤1.5mm; And / or, along the thickness direction of the protective plate, the size of the reinforcing layer is H4, satisfying: 5mm≤H4≤12mm.

32. An electrical device, comprising: The battery device comprises the battery device according to any one of claims 1-31, and the battery device is used for providing electric energy.

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