Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a battery box body and a battery cell arranged in the box body. The battery box body comprises a box body main body and a guard plate assembly. The box body main body comprises a support plate for supporting the battery cell. The guard plate assembly is arranged outside the box body main body and is stacked and connected with the support plate. The guard plate assembly comprises a plurality of buffer layers and a plurality of guard plates arranged alternately along a first direction. The battery device and the power utilization device provided by the application can improve the impact resistance of the battery device.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery device and an electrical device. Background Technology

[0002] Related technologies incorporate protective plates outside the support plates of the battery casing in battery devices to reduce the risk of damage to the battery device. However, conventional protective plates absorb such impacts through their own structural deformation, and their impact absorption capacity is limited, resulting in weak impact resistance and consequently, weak impact resistance of the battery device. Utility Model Content

[0003] In view of the above problems, this application provides a battery device and an electrical device, which aims to improve the impact resistance of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, which includes a battery housing and battery cells disposed within the housing. The battery housing includes a housing body and a protective plate assembly. The housing body includes a support plate for supporting the battery cells. The protective plate assembly is located outside the housing body and is stacked and connected to the support plate. The protective plate assembly includes a plurality of buffer layers and a plurality of protective plates alternately arranged along a first direction.

[0005] The protective plate assembly in the battery box provided in this application embodiment is provided with multiple buffer layers and multiple protective plates. This allows the protective plate assembly to absorb external impacts not only by utilizing the deformation of the multiple protective plates themselves, but also by utilizing the multiple buffer layers. This can improve its own impact resistance to a certain extent, reduce the risk of the support plate of the main body of the box breaking, and thus improve the impact resistance of the battery device to a certain extent.

[0006] In some possible implementations, at least one protective plate and a support plate form a sealed cavity, and at least one buffer layer is disposed within the sealed cavity. This reduces the risk that objects outside the battery box (such as water, dust, stones, corrosive substances, etc.) may enter the cavity formed by the protective plate assembly and the support plate through the gap between them, thereby reducing the risk of such objects coming into contact with the support plate and consequently reducing the risk of damage to the support plate.

[0007] In some possible implementations, in the first direction, the guard plate with the smallest distance from the support plate among all guard plates is designated as the first guard plate, and the guard plate with the largest distance from the support plate among all guard plates is designated as the second guard plate. At least one of the first guard plate and the second guard plate and the support plate form a sealed cavity.

[0008] This reduces the risk of external objects (such as water, dust, stones, corrosive substances, etc.) entering the cavity formed by the protective plate assembly and the support plate through the gap between them. This reduces the risk of these objects contacting the support plate, and consequently, the risk of damage to the support plate. Furthermore, when the second protective plate and the support plate form a sealed cavity, objects outside the battery box can only contact the support plate after breaking through the protective plates and buffer layers in the protective plate assembly layer by layer. This not only reduces the risk of damage to the support plate but also reduces the risk of damage to the buffer layer and protective plate located within the sealed cavity.

[0009] In some possible implementations, at least a portion of the first protective plate and at least a portion of the support plate are sealed together by a first sealing structure to form a first receiving cavity, and a buffer layer located between the first protective plate and the support plate is disposed within the first receiving cavity. By employing the structure provided in this embodiment, the risk of objects outside the battery box entering the first receiving cavity through the gap between the first protective plate and the support plate can be reduced, thereby reducing the risk of damage to the buffer layer and the support plate located between the first protective plate and the support plate.

[0010] In some possible implementations, the first sealing structure includes a welded structure and / or a sealant layer. This first sealing structure, including a welded structure and / or a sealant layer, is easy to operate and provides a good seal.

[0011] In some possible implementations, the thickness of the second guard plate is greater than or equal to the thickness of the first guard plate. Since the second guard plate is located outside the first guard plate, and its thickness is greater than or equal to that of the first guard plate, the second guard plate can withstand greater impacts than the first guard plate, reducing the risk of breakage and thus reducing the risk of damage to components located inside the second guard plate.

[0012] In some possible implementations, at least a portion of two adjacent protective plates are sealed together by a second sealing structure to form a second receiving cavity, with a buffer layer located between the two adjacent protective plates disposed within the second receiving cavity. Using the structure provided in this embodiment, the risk of objects outside the battery box entering the second receiving cavity through the gap between the two adjacent protective plates can be reduced, thereby reducing the risk of damage to the buffer layer located within the second receiving cavity. Combined with the previous implementation, it can also reduce the risk of damage to the inner protective plates and support plates.

[0013] In some possible implementations, the second sealing structure includes a welded structure and / or a sealant layer. This second sealing structure, including a welded structure and / or a sealant layer, is easy to operate and provides a good seal.

[0014] In some possible implementations, at least part of the guard plate is also connected to the support plate by fasteners. This connection between at least part of the guard plate and the support plate, compared to all guard plates and the support plate being connected solely by the aforementioned first and second sealing structures, further improves the stability of the three-way connection structure.

[0015] In some possible implementations, a fastener avoidance buffer layer is provided. This fastener avoidance buffer layer can reduce the adverse effects of fastener deformation on the buffer layer and its ability to absorb impact forces and noise.

[0016] In some possible implementations, among all the protective plates connected to the support plate by fasteners, the protective plate with the largest distance from the support plate in a first direction is designated as the target protective plate. The target protective plate has a through hole through which the fastener passes. A third sealing structure is provided between the outer wall of the fastener and the inner wall of the through hole to seal the gap between the outer wall of the fastener and the inner wall of the through hole. The third sealing structure reduces the risk of objects outside the battery box entering the cavity formed by the protective plate assembly and the support plate through the gap between the fastener and the target protective plate, thereby reducing the risk of contact between objects outside the battery box and the support plate, and consequently reducing the risk of damage to the support plate.

[0017] In some possible implementations, the third sealing structure includes a sealing ring fitted over the fastener, at least a portion of which is interference-fitted with the gap. The third sealing structure, using the solution provided in this embodiment, is simple in structure and easy to assemble.

[0018] In some possible implementations, the guard plate includes a plate body and a protrusion. The plate body is disposed opposite to the support plate, the protrusion is disposed around the plate body and connected to the plate body, at least a portion of the protrusion protrudes toward the support plate, the guard plate is sealed to the support plate or an adjacent guard plate through the protrusion, and at least a portion of the plate body of the guard plate is connected to the support plate by fasteners.

[0019] Typically, each protective plate is spaced apart from the support plate. This allows at least a portion of the protective plate to be connected to the support plate via fasteners, enabling the connection of at least a portion of the hollow structure between the protective plate assembly and the support plate, thus improving the stability of the connection structure between the protective plate assembly and the support plate.

[0020] In some possible implementations, the battery housing includes a main body and support beams. Both the support beams and individual battery cells are located within the main body, and at least some of the battery cells abut against at least some of the support beams. The positions of the fasteners correspond to the positions of the support beams. This design ensures that when the battery housing is subjected to impact, the external impact force is not transmitted to the battery cells through the fasteners, thus stabilizing the performance of the battery device.

[0021] In some possible implementations, at least two protective plates have identical structures. This facilitates design and fabrication.

[0022] In some possible implementations, the location of at least part of the buffer layer corresponds to the location of the battery cell.

[0023] At least part of the buffer layer is positioned to correspond to the position of the battery cell. This allows at least part of the buffer layer to disperse or absorb the impact force acting on the area where the battery cell is located, thereby reducing the risk of impact to the battery cell and improving the reliability of the battery cell to a certain extent.

[0024] In some possible implementations, the buffer layer includes multiple buffer sections arranged in an array. Since battery modules formed by individual battery cells in a battery device are generally arranged in an array, the buffer layer including multiple buffer sections arranged in an array allows each buffer section to correspond to one or more battery modules. This reduces the risk of damage to the battery modules, reduces the number of buffer sections required in the buffer layer, facilitates assembly, and can reduce manufacturing costs to some extent.

[0025] In some possible implementations, at least two adjacent buffer sections are spaced apart within the same buffer layer. Using the solution provided in this embodiment, buffer sections can be placed only at locations where they are needed (such as the location corresponding to a battery cell), and not at locations where they are not needed (such as the portion of the support plate not used for contact with the battery cell). Compared to all buffer sections being connected in the same buffer layer, this reduces the number of buffer sections and the amount of material required, thereby lowering the manufacturing cost of the buffer layer.

[0026] In some possible implementations, the cushioning part is made of foam. Foam is used for the cushioning part because it provides good cushioning and is readily available.

[0027] In some possible implementations, at least one protective plate has a reinforcing structure in the area covered by the buffer section. The reinforcement structure enhances the impact resistance of the area covered by the buffer section, and since the area covered by the buffer section generally supports the battery cells, this reduces the risk of damage to the battery cells and improves the reliability of the battery device to some extent.

[0028] In some possible implementations, at least a portion of the reinforcing structure protrudes away from the support plate. This allows the protruding portion of the reinforcing structure to contact an object outside the battery box first when the protective plate assembly is impacted, thus reducing the risk of impact or damage to the main body of the protective plate, and consequently reducing the risk of damage to the support plate of the main body of the battery box.

[0029] In some possible implementations, the reinforcing structure is integrally molded into the protective plate. Integrating the reinforcing structure into the protective plate ensures a stable connection between the reinforcing structure and the protective plate, and facilitates fabrication and assembly.

[0030] In some possible implementations, the support plate is equipped with a liquid cooling structure.

[0031] The support plate is equipped with a liquid cooling structure, which facilitates the cooling of individual battery cells and can improve the reliability of the battery device to a certain extent.

[0032] Secondly, embodiments of this application provide an electrical device, including the battery device provided by any of the above solutions.

[0033] The effect of the second aspect is the same as that of the first aspect, so it will not be repeated here.

[0034] 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 above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] 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:

[0036] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0037] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0038] Figure 3 This is a three-dimensional structural diagram of the battery housing provided in some embodiments of this application;

[0039] Figure 4 An exploded view of the protective plate assembly in the battery box provided in some embodiments of this application;

[0040] Figure 5 A schematic diagram of the assembly structure of the battery box inner protective plate assembly provided in some embodiments of this application;

[0041] Figure 6 This is a schematic diagram of the assembly structure of the battery box body and the battery cells provided in some embodiments of this application.

[0042] The reference numerals in the detailed embodiments are as follows:

[0043] 1000, vehicles;

[0044] 100. Battery assembly; 200. Controller; 300. Motor;

[0045] 10. Battery housing; 11. Cover; 12. Tray; 13. Main body of the housing; 14. Protective plate assembly; 14a. Buffer layer; 14b. Protective plate; 15. Fasteners; 20. Individual battery cell;

[0046] 131. Main body; 132. Support beam; 141. First buffer layer; 142. First protective plate; 143. Second buffer layer; 144. Second protective plate; 145. Reinforcing structure; 146. Through hole;

[0047] 1411. Buffer part; 1421. Plate body; 1422. Projection part;

[0048] Z, First direction. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0054] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0055] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0056] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0057] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0058] Because the batteries in electric vehicles, hybrid vehicles, and other electrical devices are typically located at the bottom of the device, they are susceptible to damage from impacts by objects on the road, such as stones and branches. To address this issue, a protective plate is installed below the support plate of the battery compartment. This plate prevents the bottom of the battery from being scratched, and for vehicles that frequently travel on rough roads (such as muddy or gravel roads), the plate also protects the battery from impacts by gravel and mud, reducing the risk of damage and contributing to a longer battery lifespan.

[0059] However, conventional skid plates absorb the aforementioned impacts through structural deformation, but their impact absorption capacity is limited, resulting in weak impact resistance. Vehicles typically experience significant impacts in harsh road conditions, which can easily exceed the impact limits of conventional skid plates. This leads to conventional skid plates being prone to cracking in severe conditions, failing to protect the battery pack's support plate. A cracked support plate exposes the battery cells, exposing them to impacts and increasing the risk of damage, fire, or explosion.

[0060] To improve the impact resistance of battery devices, this application provides a battery device. The protective plate assembly in this battery device includes multiple buffer layers and multiple protective plates. This allows the protective plate assembly to absorb external impacts not only through the deformation of the multiple protective plates themselves, but also through the multiple buffer layers. This improves its impact resistance to a certain extent, reduces the risk of breakage of the support plate of the main body of the casing, and thus enhances the impact resistance of the battery device.

[0061] The battery housing disclosed in this application can be used for battery devices, electrical devices that use battery devices as power sources, or various energy storage devices, energy storage systems, and charging networks that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] 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.

[0063] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-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. A battery apparatus 100 is provided inside the vehicle 1000, and the battery apparatus 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery apparatus 100 can be used to power the vehicle 1000. For example, the battery apparatus 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery apparatus 100 to supply power to the motor 300, for example, to meet the power requirements of the vehicle 1000 during starting, navigation, and driving.

[0064] In some embodiments 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 for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0065] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery housing 10 and battery cells 20, with the battery cells 20 housed within the battery housing 10.

[0066] The battery housing 10 provides a storage space for the individual battery cells 20, and can adopt various structures. In some embodiments, the battery housing 10 may include a cover 11 and a tray 12. The cover 11 covers the tray 12, and together with the tray 12, defines a storage space for accommodating the individual battery cells 20. The tray 12 may be a hollow structure with one open end, and the cover 11 may be a plate-like structure, covering the open side of the tray 12 so that the cover 11 and the tray 12 together define the storage space; alternatively, both the cover 11 and the tray 12 may be hollow structures with side openings, with the open side of the cover 11 covering the open side of the tray 12. Of course, the battery housing 10 formed by the cover 11 and the tray 12 can be of various shapes, such as a circular through-hole or a cuboid. The tray 12 is an important structural support component in the battery system, used to store and protect the individual battery cells, and also has a significant impact on the collision safety of the entire vehicle and the overall torsional and bending stiffness of the vehicle body.

[0067] A battery cell 20 refers to the smallest unit that makes up the battery device 100. Multiple battery cells 20 can be provided, and these cells can be connected in series, parallel, or mixed connection via a busbar. Mixed connection means that multiple battery cells 20 can be connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or mixed connection, and then the entire assembly of the multiple battery cells 20 is housed within the battery casing 10. Alternatively, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or mixed connection to form a battery module, and then connecting multiple battery modules in series, parallel, or mixed connection to form a whole, which is also housed within the battery casing 10. The battery device 100 may also include other structures; for example, it may include a busbar for electrical connection between the multiple battery cells 20. As an example, multiple battery cells 20 can form a battery module, which is formed by arranging and fixing multiple battery cells 20 into an independent module. As an example, a battery module can be formed by binding multiple battery cells 20 together with cable ties.

[0068] Each battery cell 20 can be a secondary battery or a primary battery. A secondary battery refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can have a circular through-body, a flat body, a cuboid, or other shapes.

[0069] Figure 3 This is a three-dimensional structural diagram of the battery housing provided in some embodiments of this application; Figure 4 This is an exploded structural diagram of the protective plate assembly in the battery casing provided in some embodiments of this application. Please refer to... Figure 3 and Figure 4 This application provides a battery device. The battery device includes a battery housing and individual battery cells disposed within the battery housing. The battery housing 10 includes a housing body 13 and a protective plate assembly 14. The housing body 13 includes a support plate for supporting the individual battery cells. The protective plate assembly 14 is located outside the housing body 13 and is stacked and connected to the support plate. The protective plate assembly 14 includes a plurality of buffer layers 14a and a plurality of protective plates 14b alternately arranged along a first direction Z.

[0070] The main body 13 of the enclosure generally includes the cover 11 and the tray 12 mentioned above, but may also include only the tray 12, depending on the specific needs of use. In special cases, the main body 13 of the enclosure may also be part of the electrical device, used to carry the battery cells 20.

[0071] The main body 13 of the enclosure has at least a support plate for supporting the battery cells 20. The support plate is generally the bottom plate of the main body 13, but in special cases it can also be other plates in the main body 13.

[0072] The protective plate assembly 14 is a component located on the outside of the aforementioned support plate and is used to protect the support plate.

[0073] The first direction Z is the arrangement direction of the protective plate assembly 14 and the support plate, and it is also the arrangement direction of the buffer layer and the protective plate assembly 14. It is generally the thickness direction of the protective plate assembly 14 (which is also the thickness direction of the support plate), or it can be a direction that is set at an acute angle to any of the above thickness directions.

[0074] The guard plate 14b can absorb external impact energy through its own deformation, and can be made of metal plates (such as aluminum alloy plates, magnesium alloy plates, etc.) or composite material guard plates. The materials and structures of each guard plate 14b can be the same or different, depending on the application requirements.

[0075] The buffer layer 14a is used to absorb and disperse the external impact energy transmitted from the protective plate 14b to the support plate, and to prevent the support plate of the battery box 10 from being damaged by collision, scratch or impact from foreign objects on the road.

[0076] The buffer layer 14a can be a foam layer, a foamed polymer layer, etc. The materials and structures of different buffer layers 14a can be the same or different, depending on the application requirements.

[0077] Multiple buffer layers 14a and multiple protective plates 14b are alternately arranged along the first direction Z in a pattern of buffer layer 14a, protective plate 14b, buffer layer 14a, protective plate 14b, buffer layer 14a, protective plate 14b, ...

[0078] In this embodiment, there can be two or more buffer layers 14a and protective plates 14b, depending on the specific needs of use.

[0079] like Figure 4 As shown, when the protective panel assembly 14 is provided with two buffer layers 14a and two protective plates 14b, the protective panel assembly 14 can be referred to as including a first buffer layer 141, a first protective plate 142, a second buffer layer 143, and a second protective plate 144 arranged sequentially along a first direction. Among them, the first buffer layer 141 is located between the support plate of the housing body 13 and the first protective plate 142.

[0080] For ease of description, the principle of the battery device provided in this application embodiment absorbing impact will be explained by taking the protective plate assembly 14, which includes a first buffer layer 141, a first protective plate 142, a second buffer layer 143, and a second protective plate 144 arranged sequentially along the first direction Z:

[0081] When the bottom of the battery housing 10 is impacted, the outermost second protective plate 144 absorbs most of the impact energy through its own deformation. The inner second buffer layer 143 then absorbs a portion of the impact energy, followed by the inner first protective plate 142, which absorbs a further portion through its own deformation. The remaining small portion of the impact energy is absorbed and dispersed by the first buffer layer 141 before being transferred to the support plate. This multi-stage deformation and buffering absorption of impact energy reduces the risk of structural damage to the support plate and the battery cells 20 within the battery housing 10, thereby reducing the risk of fire, explosion, and other hazards, and ensuring the reliability of the battery device throughout its lifespan. Furthermore, the first and second buffer layers 141 and 143 also absorb noise, reducing the noise level of the battery housing 10 during operation.

[0082] The protective plate assembly 14 in the battery housing 10 provided in this application embodiment is provided with multiple buffer layers 14a and multiple protective plates 14b. This allows the protective plate assembly 14 to absorb external impacts not only by utilizing the deformation of the multiple protective plates 14b themselves, but also by utilizing the multiple buffer layers 14a to absorb external impacts. This can improve its own impact resistance to a certain extent, reduce the risk of the support plate of the housing body 13 breaking, and thus improve the impact resistance of the battery device to a certain extent.

[0083] In addition, the battery housing 10 provided in this application embodiment can reduce noise, improve the structural stability and performance reliability of the battery device and the power device, reduce the use risk of the battery device and the power device, and thus improve the reliability of the battery device and the power device throughout their life cycle.

[0084] In some embodiments, at least one protective plate 14b and a support plate form a sealed cavity. At least one buffer layer 14a is disposed within the sealed cavity.

[0085] A sealed cavity refers to a cavity that is isolated from the outside and has no connecting channels, so that water vapor, impurities, etc. cannot enter the cavity enclosed by the support plate and the protective plate assembly 14 through the connection between them.

[0086] For ease of understanding, the protective plate assembly 14 can be described as including a first buffer layer 141, a first protective plate 142, a second buffer layer 143 and a second protective plate 144 arranged sequentially along the first direction. In this embodiment, at least one protective plate 14b forms a sealed cavity with the support plate, and at least one buffer layer 14a is disposed in the sealed cavity.

[0087] The solution provided in this embodiment includes at least the following situations: First, the first protective plate 142 forms a sealed cavity with the support plate, and the second protective plate 144 does not contact the support plate, or although the second protective plate 144 contacts the support plate, it does not form a sealed cavity with the support plate. In this case, only the first buffer layer 141 is provided in the sealed cavity; Second, both the first protective plate 142 and the second protective plate 144 form a sealed cavity with the support plate. In this case, the first buffer layer 141 is provided in the sealed cavity formed by the first protective plate 142 and the support plate, and the second buffer layer 143 is provided in the sealed cavity formed by the second protective plate 144 and the support plate; Third, the first protective plate 142 does not form a sealed cavity with the support plate, and the second protective plate 144 forms a sealed cavity with the support plate. In this case, the first buffer layer 141, the first protective plate 142, and the second buffer layer 143 can all be provided in the sealed cavity.

[0088] At least one protective plate 14b forms a sealed cavity with the support plate, which reduces the risk that objects outside the battery box 10 (such as water, dust, stones, corrosive substances, etc.) will enter the cavity formed by the three through the gap between the protective plate assembly 14b and the support plate, thereby reducing the risk of the aforementioned objects coming into contact with the support plate and thus reducing the risk of damage to the support plate.

[0089] In some embodiments, in the first direction Z, the guard plate 14b with the smallest distance from the support plate among all guard plates 14b is designated as the first guard plate 142, and the guard plate 14b with the largest distance from the support plate among all guard plates 14b is designated as the second guard plate 144. At least one of the first guard plate 142 and the second guard plate 144 and the support plate form a sealed cavity.

[0090] This reduces the risk that objects outside the battery housing 10 (such as water, dust, stones, corrosive substances, etc.) may enter the cavity formed by the protective plate assembly 14 and the support plate through the gap between them, thereby reducing the risk of these objects coming into contact with the support plate and consequently reducing the risk of damage to the support plate.

[0091] Furthermore, when the second protective plate 144 and the support plate form a sealed cavity, the remaining protective plate 14b and all buffer layers 14a are located within the sealed cavity. Objects outside the battery box 10 can only damage the structures in the protective plate assembly 14 layer by layer, such as the second protective plate 144, the second buffer layer 143, the first protective plate 142, and the first buffer layer 141 before they can come into contact with the support plate. This not only reduces the risk of damage to the support plate but also reduces the risk of damage to the first buffer layer 141, the second buffer layer 143, and the first protective plate 142.

[0092] In some embodiments, at least a portion of the first guard plate 142 is sealed to at least a portion of the support plate by a first sealing structure, forming a first receiving cavity. A buffer layer 14a located between the first guard plate 142 and the support plate is disposed within the first receiving cavity.

[0093] At least a portion of the first protective plate 142 is sealed to at least a portion of the support plate through a first sealing structure, forming a first receiving cavity, including at least the following situations: First, the edge of the first protective plate 142 is sealed to the edge of the support plate through the first sealing structure, and the first protective plate 142 and the support plate form the first receiving cavity; Second, a portion of the first protective plate 142 is sealed to a portion of the support plate through the first sealing structure, and the sealed portion of the two forms the first receiving cavity; Third, the dimensions of the orthographic projection of the first protective plate 142 onto the support plate along the first direction are all smaller than the dimensions of the support plate, the edge of the first protective plate 142 is sealed to a portion of the support plate, and the portion of the first protective plate 142 and the support plate covered by the first protective plate 142 forms the first sealed cavity.

[0094] It is understandable that when the edge of the first protective plate 142 is sealed to the support plate through the first sealing structure, the volume of the first accommodating cavity formed by the first protective plate 142 and the support plate is large, and the volume of the buffer layer 14a (such as the first buffer layer 141 mentioned above) provided inside can be large, thereby absorbing more external impact energy and improving the impact resistance of the protective plate assembly 14 and the battery box 10 to a certain extent.

[0095] The first sealing structure is a sealing structure used to seal the gap at the connection between the first protective plate 142 and the support plate. It can be a sealing gasket, sealing ring, welding structure, etc., and the specific structure can be determined according to the application requirements.

[0096] In this embodiment, the first receiving cavity may or may not be a sealed cavity, depending on the usage requirements. If a sealed cavity is formed between the second protective plate 144 and the support plate, the first receiving cavity may have a channel communicating with the sealed cavity; if no sealed cavity is formed between the second protective plate 144 and the support plate, the first receiving cavity may be set as a sealed cavity in order to provide better protection for the support plate.

[0097] By adopting the structure provided in this embodiment, the risk of objects outside the battery box 10 entering the first receiving cavity through the gap between the first protective plate 142 and the support plate can be reduced, thereby reducing the risk of damage to the first buffer layer 141 and the support plate.

[0098] In some embodiments, the first sealing structure includes a welded structure and / or a sealant layer.

[0099] The first sealing structure includes a welded structure and / or a sealing layer, and includes at least the following types: First, the first sealing structure includes a welded structure, that is, at least a portion of the first protective plate 142 is sealed to at least a portion of the support plate through the welded structure; Second, the first sealing structure includes a sealing layer, that is, at least a portion of the first protective plate 142 is sealed to at least a portion of the support plate through the sealing layer; Third, the first sealing structure includes a welded structure and a sealing layer, that is, at least a portion of the first protective plate 142 is sealed to at least a portion of the support plate through the welded structure and the sealing layer.

[0100] The welded structure can be formed by brazing or by other welding methods, depending on the materials of the first protective plate 142 and the support plate, as well as the sealing requirements. The sealant layer can be a silicone sealant layer, a polyurethane sealant layer, etc., depending on the materials of the first protective plate 142 and the support plate, as well as the sealing requirements.

[0101] The first sealing structure includes a welded structure and / or a sealing layer, which is easy to operate and provides a good sealing effect.

[0102] In some embodiments, the thickness of the second guard plate 144 is greater than or equal to the thickness of the first guard plate 142.

[0103] The thickness of the second protective plate 144 is the dimension of the second protective plate 144 in its own thickness direction (also the first direction). The thickness of the first protective plate 142 is the dimension of the first protective plate 142 in its own thickness direction (also the first direction).

[0104] Since the second guard plate 144 is outside the first guard plate 142, and the thickness of the second guard plate 144 is greater than or equal to the thickness of the first guard plate 142, the second guard plate 144 can withstand greater impact than the first guard plate 142, which can reduce the risk of the second guard plate 144 breaking. This can reduce the risk of damage to the components located inside the second guard plate 144 (such as the second buffer layer 143, the first guard plate 142, the first buffer layer 141, and the support plate).

[0105] In some embodiments, at least a portion of two adjacent protective plates 14b are sealed together by a second sealing structure, forming a second receiving cavity. A buffer layer 14a located between two adjacent protective plates 14b is disposed within the second receiving cavity.

[0106] The second sealing structure is a sealing structure used at least to seal the gap at the connection between two adjacent protective plates 14b. It can be a sealing gasket, sealing ring, welded structure, etc., depending on the application requirements. The material and structure of the second sealing structure can be the same as or different from the first sealing structure, depending on the application requirements.

[0107] In this embodiment, the second receiving cavity may or may not be a sealed cavity, depending on the usage requirements. If the first receiving cavity formed between the first protective plate 142 and the support plate is a sealed cavity, then the second receiving cavity may have a channel communicating with the external space of the battery box 10; if the first receiving cavity formed between the first protective plate 142 and the support plate is not a sealed cavity, then in order to better protect the support plate, the second receiving cavity may be set as a sealed cavity.

[0108] By adopting the structure provided in this embodiment, the risk of objects outside the battery box 10 entering the second receiving cavity through the gap between two adjacent protective plates 14b can be reduced, thereby reducing the risk of damage to the buffer layer 14a located in the second receiving cavity. Combined with the solution of the previous embodiment, the risk of damage to the inner protective plate 14b and the support plate can also be reduced.

[0109] In some embodiments, the second sealing structure includes a welded structure and / or a sealant layer.

[0110] The second sealing structure includes a welded structure and / or a sealant layer, and includes at least the following types: First, the second sealing structure includes a welded structure, that is, at least a portion of two adjacent protective plates 14b are sealed together by the welded structure; Second, the second sealing structure includes a sealant layer, that is, at least a portion of two adjacent protective plates 14b are sealed together by the sealant layer; Third, the second sealing structure includes a welded structure and a sealant layer, that is, at least a portion of two adjacent protective plates 14b are sealed together by the welded structure and the sealant layer.

[0111] The welded structure can be formed by brazing or by other welding methods, depending on the materials of the two adjacent protective plates 14b and the sealing requirements. The sealant layer can be a silicone sealant layer, a polyurethane sealant layer, etc., depending on the materials of the two adjacent protective plates 14b and the sealing requirements.

[0112] The first sealing structure and the second sealing structure can have the same or different structures, depending on the application requirements.

[0113] The second sealing structure includes a welded structure and / or a sealing layer, which is easy to operate and provides a good sealing effect.

[0114] like Figure 3 and Figure 4 As shown, in some embodiments, at least a portion of the guard plate 14b is also connected to the support plate via fasteners 15.

[0115] Fastener 15 is a general-purpose part used for connection, fixation, sealing or adjustment in mechanical assembly. It can be bolts, screws, threaded rods, etc., depending on the specific needs of use.

[0116] At least some of the guard plates 14b are also connected to the support plate by fasteners 15. Compared with all the guard plates 14b and the support plate being connected only by the first sealing structure and the second sealing structure, the stability of the connection structure of the three can be further improved.

[0117] In some embodiments, the fastener 15 is provided to avoid the buffer layer 14a.

[0118] Avoidance means that the fastener 15 and the buffer layer 14a do not interfere with, collide with or conflict with each other.

[0119] The fastener 15 is designed to avoid the buffer layer 14a, which can reduce the adverse effects of the fastener on the deformation of the buffer layer 14a and the absorption of impact force and noise.

[0120] like Figure 4As shown, in some embodiments, among all the guard plates 14b connected to the support plate by fasteners, the guard plate 14b with the largest distance from the support plate in the first direction is designated as the target guard plate. The target guard plate has a through hole 146 for the fastener to pass through. A third sealing structure is provided between the outer wall of the fastener and the inner wall of the through hole 146. The third sealing structure is used to seal the gap between the outer wall of the fastener and the inner wall of the through hole 146.

[0121] A through hole 146 refers to a hole that penetrates two opposing sides of the second protective plate 144 along its thickness direction (also the first direction). The size of the through hole 146 is generally larger than the cross-sectional size of the portion of the fastener within the through hole 146. That is, there is generally a clearance fit between the outer wall of the fastener and the inner wall of the through hole 146.

[0122] The third sealing structure is used to seal the gap between the outer wall of the fastener and the inner wall of the through hole 146. The third sealing structure can be made of rubber gaskets, foam layers, etc., depending on the application requirements.

[0123] The third sealing structure reduces the risk of objects outside the battery box 10 entering the cavity formed by the guard plate assembly 14 and the support plate through the gap between the fastener 15 and the second guard plate 144. This reduces the risk of objects outside the battery box 10 coming into contact with the support plate, thereby reducing the risk of damage to the support plate.

[0124] In some embodiments, the third sealing structure includes a sealing ring fitted over the fastener 15. At least a portion of the sealing ring is interference-fitted with the gap.

[0125] An interference fit means that the inner wall of the sealing ring is in close contact with the outer wall of the fastener 15, and the outer diameter of the part of the sealing ring inside the through hole 146 is larger than the inner diameter of the through hole 146. The sealing ring needs to be forcibly assembled into the through hole 146 by external force, and the radial pressure generated on the inner wall of the through hole 146 by elastic deformation is used to achieve fastening.

[0126] The third sealing structure adopts the solution provided in this embodiment, which is simple in structure and easy to assemble.

[0127] Figure 5 This is a schematic diagram illustrating the assembly structure of the protective plate assembly in the battery casing according to some embodiments of this application. For example... Figure 5 As shown, in some embodiments, the protective plate 14b includes a plate body 1421 and a protrusion 1422. The plate body 1421 is disposed opposite to the support plate. The protrusion 1422 is disposed around the plate body 1421 and connected to the plate body 1421. At least a portion of the protrusion 1422 protrudes toward the support plate. The protective plate 14b is sealingly connected to the support plate or an adjacent protective plate 14b via the protrusion 1422. At least a portion of the plate body 1421 of the protective plate 14b is connected to the support plate by fasteners.

[0128] The structures of each protective plate 14b in this embodiment can be the same or different, depending on the usage requirements.

[0129] The guard plate 14b may include only the plate body 1421 and the protrusion 1422, or it may include other components in addition to the plate body 1421 and the protrusion 1422, depending on the needs of use.

[0130] The plate body 1421 and the protrusion 1422 in the same protective plate 14b can be integrally formed or connected separately.

[0131] Both the plate 1421 and the protrusion 1422 are components of the protective plate 14b.

[0132] The plate 1421 can be a flat plate or a plate-shaped structure with concave and convex structures. The protrusion 1422 can protrude partially or entirely from the plate 1421, depending on the application requirements.

[0133] Normally, the plate body 1421 of each guard plate 14b is spaced apart from the support plate. In this way, at least some of the plate bodies 1421 of the guard plates 14b are connected to the support plate by fasteners 15, which allows the hollow parts of the guard plate assembly 14 and the support plate to be connected by fasteners 15, thus helping to improve the stability of the connection structure between the guard plate assembly 14 and the support plate.

[0134] Figure 6 This is a schematic diagram illustrating the assembly structure of the battery housing body and individual battery cells in some embodiments of this application. Figure 6 As shown, in some embodiments, the housing body 13 includes a main body 131 and a support beam 132. Both the support beam 132 and the battery cells 20 are disposed within the main body 131, and at least a portion of the battery cells 20 abuts against at least a portion of the support beam 132. The positions of the fasteners correspond to the positions of the support beam 132.

[0135] The main body 131 is the main part of the box body 13, and may include the main structures of the cover 11 and the tray 12 (such as the support plate and the side wall connected to the support plate). The support beam 132 is a beam provided in the tray 12 to provide support or to suppress the expansion of the battery cell 20. It can be an expansion beam or a beam that does not contact the battery cell 20 or does not suppress the expansion of the battery cell 20.

[0136] The position of the fastener corresponds to the position of the support beam 132, meaning that along the first direction, the orthographic projection of the fastener on the support plate falls completely within the orthographic projection of the support beam 132 on the support plate.

[0137] This ensures that when the battery housing 10 is subjected to impact, the external impact force will not be transmitted to the battery cells 20 through the fasteners, thus stabilizing the performance of the battery device.

[0138] In some embodiments, at least two protective plates 14b have the same structure. This facilitates design and fabrication.

[0139] In some embodiments, at least a portion of the buffer layer 14a is positioned corresponding to the position of the battery cell 20.

[0140] The position of at least a portion of the buffer layer 14a corresponds to the position of the battery cell 20, meaning that the orthogonal projection area of ​​the battery cell 20 along the first direction on at least a portion of the buffer layer 14a completely falls onto the buffer layer 14a.

[0141] At least part of the buffer layer 14a is positioned corresponding to the position of the battery cell 20, so that the buffer layer 14a can disperse or absorb the impact force acting on the area where the battery cell 20 is located, thereby reducing the risk of the battery cell 20 being impacted and improving the reliability of the battery cell 20 to a certain extent.

[0142] like Figure 5 As shown, in some embodiments, the buffer layer 14a includes a plurality of buffer sections 1411 arranged in an array.

[0143] Since the battery modules formed by the battery cells 20 in the battery device are generally arranged in an array, the buffer layer 14a includes multiple buffer parts 1411 arranged in an array, so that each buffer part 1411 corresponds to one or more battery modules. This can reduce the risk of damage to the battery modules, and can reduce the number of buffer parts 1411 required in the buffer layer 14a, making assembly easier and reducing manufacturing costs to a certain extent.

[0144] In some embodiments, at least two adjacent buffer sections 1411 are spaced apart in the same buffer layer 14a.

[0145] The interval setting refers to the existence of a certain gap between the two buffer sections 1411.

[0146] At least two adjacent buffer sections 1411 are spaced apart, including at least the following situations: First, in the same buffer layer 14a, some adjacent buffer sections 1411 are spaced apart, and other adjacent buffer sections 1411 are connected; Second, in the same buffer layer 14a, any two adjacent buffer sections 1411 are spaced apart.

[0147] The same buffer layer 14a can be the same first buffer layer 141, the same second buffer layer 143, or other buffer layers, depending on the specific needs of use.

[0148] By adopting the solution provided in this embodiment, the buffer section 1411 can be set only at the position where the buffer section 1411 is required (such as the position corresponding to the battery cell 20), and the buffer section 1411 is not set at the position where the buffer section 1411 is not required (such as the part of the support plate that is not used to contact the battery cell 20). Compared with all the buffer sections 1411 in the same buffer layer 14a being connected, the number of buffer sections 1411 and the amount of materials required can be reduced to a certain extent, thereby reducing the manufacturing cost of the buffer layer 14a.

[0149] In some embodiments, the buffer portion 1411 is a foam portion.

[0150] The buffer section 1411 is made of foam, which has a good cushioning effect and is easy to obtain.

[0151] like Figure 4 As shown, in some embodiments, at least one guard plate 14b is provided with a reinforcing structure 145 in the area covered by the buffer portion 1411.

[0152] The reinforcing structure 145 is a structure that can enhance the impact resistance of the protective plate 14b, and can be a reinforcing rib, reinforcing block, etc.

[0153] The reinforcing structure 145 can be integrally formed with the protective plate 14b, or it can be separately connected to the protective plate 14b.

[0154] The area covered by the buffer 1411 can be the area covered only by the buffer 1411, or it can be the entire area of ​​the protective plate 14b, or the area of ​​the protective plate 14b covered by the buffer 1411 and at least a portion of the area outside the area covered by the buffer 1411.

[0155] The reinforcement structure 145 can enhance the impact resistance of the area of ​​the protective plate 14b covered by the buffer part 1411. Since the area covered by the buffer part 1411 is generally the area that supports the battery cell 20, this can reduce the risk of damage to the battery cell 20 and improve the reliability of the battery device to a certain extent.

[0156] In some embodiments, at least a portion of the reinforcing structure 145 protrudes toward the direction away from the support plate.

[0157] The reinforcing structure 145 can be integrally formed on the protective plate 14b through processes such as stamping and integral forming, or it can be installed on the protective plate 14b after it has been manufactured by means of welding or plugging.

[0158] At least a portion of the reinforcing structure 145 protrudes in a direction away from the support plate, so that when the protective plate assembly 14 is impacted, the protruding portion of the reinforcing structure 145 can first contact an object outside the battery box 10, which can reduce the risk of the main body of the protective plate 14b being impacted or damaged to a certain extent, thereby reducing the risk of damage to the support plate of the main body of the box 13.

[0159] In some embodiments, the reinforcing structure 145 is integrally formed on the protective plate 14b.

[0160] The reinforcing structure 145 is integrally molded onto the protective plate 14b, meaning that the reinforcing structure 145 and the protective plate 14b are manufactured by integral molding. For example, the combined structure formed by the two can be directly manufactured through processes such as stamping and injection molding. Integrating the reinforcing structure 145 into the protective plate 14b ensures a stable connection between the reinforcing structure 145 and the protective plate 14b, and facilitates preparation and assembly.

[0161] In some embodiments, the support plate is provided with a liquid cooling structure.

[0162] Liquid cooling structures can include liquid cooling channels, liquid cooling pipes, etc., for the flow of cooling media. The cooling media can be water, coolant, etc.

[0163] The support plate is equipped with a liquid cooling structure, which facilitates the cooling of the battery cells 20 and can improve the reliability of the battery device to a certain extent.

[0164] Another embodiment of this application provides an electrical device. This electrical device includes the battery device provided in any of the above embodiments.

[0165] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0166] The electrical device provided in this application embodiment includes the battery device described above and can achieve the same effect, which will not be repeated here.

[0167] like Figures 3 to 6 As shown, one embodiment of this application provides a battery device. The battery device includes a battery cell 20 and a battery housing 10. The battery cell 20 is disposed within the battery housing 10. The battery housing 10 includes a housing body 13 and a protective plate assembly 14. The protective plate assembly 14 includes a first buffer layer 141, a first protective plate 142, a second buffer layer 143, and a second protective plate 144 arranged sequentially along a first direction. The first buffer layer 141 is located between the support plate of the housing body 13 and the first protective plate 142.

[0168] The main body 13 includes a main body 131 and a support beam 132. The support beam 132 and the battery cells 20 are both located within the main body 131, and at least a portion of the battery cells 20 abuts against at least a portion of the support beam 132. The support beam 132 may be an expansion beam.

[0169] The position of the first buffer layer 141 corresponds to the position of the battery cell 20, and the position of the second buffer layer 143 corresponds to the position of the battery cell 20.

[0170] The second protective plate 144 and the support plate form a sealed cavity, and the first protective plate 142, the first buffer layer 141 and the second buffer layer 143 are all disposed in the sealed cavity.

[0171] At least a portion of the first protective plate 142 is sealed to at least a portion of the support plate by structural adhesive or brazing, forming a first receiving cavity, and a first buffer layer 141 is disposed in the first receiving cavity.

[0172] At least a portion of the second protective plate 144 is sealed to at least a portion of the first protective plate 142 by structural adhesive or brazing, forming a second receiving cavity, and a second buffer layer 143 is disposed in the second receiving cavity.

[0173] The first guard plate 142 and the second guard plate 144 are also connected to the support plate by fasteners 15.

[0174] The second guard plate 144 is provided with a through hole 146 for the fastener 15 to pass through. A third sealing structure is provided between the outer wall of the fastener 15 and the inner wall of the through hole 146. The third sealing structure is used to seal the gap between the outer wall of the fastener 15 and the inner wall of the through hole 146.

[0175] The third sealing structure includes a sealing ring fitted over the fastener 15, at least a portion of which is interference-fitted with the gap.

[0176] The first protective plate 142 and the second protective plate 144 both include a plate body 1421 and a protrusion 1422. The plate body 1421 is disposed opposite to the support plate. The protrusion 1422 is disposed around the plate body 1421 and connected to the plate body 1421. At least a portion of the protrusion 1422 protrudes toward the support plate. The first protective plate 142 is sealed to the support plate through the protrusion 1422. The second protective plate 144 is sealed to the first protective plate 142 through the protrusion 1422. The plate body 1421 of the second protective plate 144 is connected to the plate body 1421 of the first protective plate 142 and the support plate through fasteners 15.

[0177] The main body 13 of the housing includes a main body 131 and a support beam 132. The support beam 132 and the battery cells 20 are both located in the main body 131, and at least some of the battery cells 20 abut against at least some of the support beam 132. The position of the fastener 15 corresponds to the position of the support beam 132.

[0178] The first protective plate 142 and the second protective plate 144 have the same structure.

[0179] The thickness of the second protective plate 144 is greater than or equal to the thickness of the first protective plate 142.

[0180] The first buffer layer 141 and the second buffer layer 143 each include a plurality of buffer portions 1411 arranged in an array. The buffer portion 1411 is a foam portion.

[0181] In the same buffer layer, at least two adjacent buffer sections 1411 are arranged at intervals.

[0182] The first guard plate 142 and / or the second guard plate 144 are provided with a reinforcing structure 145 in the area covered by the buffer portion 1411. The reinforcing structure 145 is integrally formed on the first guard plate 142 or the second guard plate 144.

[0183] At least a portion of the reinforcing structure 145 protrudes in a direction away from the support plate.

[0184] The support plate is equipped with a liquid cooling structure.

[0185] The battery device provided in this embodiment improves the structure of the protective plate assembly 14 by adopting a 2+2 structure to enhance its resistance to bottom impacts. When the bottom of the battery device is impacted, the outermost second protective plate 144 absorbs most of the impact energy through its own deformation. The inner second buffer layer 143 then absorbs a portion of the impact energy, followed by the inner first protective plate 142, which absorbs a portion of the impact energy through its own deformation. The remaining small portion of the impact energy is absorbed and dispersed by the first buffer layer 141 and then transferred to the support plate (which is also the water-cooling plate). This multi-stage deformation and buffering absorption of impact energy reduces the risk of structural damage to the water-cooling plate and battery cells 20, thereby reducing the risk of fire, explosion, and other hazards, and ensuring the reliability of the battery device throughout its lifespan.

[0186] In this embodiment, the second protective plate 144 serves as the main body for resisting bottom impact. The second buffer layer 143 is attached to the second protective plate 144 with double-sided adhesive. Multiple protective plates have a circumferential flange surface and are sealed and connected with structural adhesive. The first buffer layer 141 is attached to the first protective plate 142 with double-sided adhesive.

[0187] To ensure the overall sealing of the protective plate assembly 14, multiple protective plate mounting interfaces (edges) are bonded together with structural adhesive and finally secured to the main body 13 of the enclosure with bolts or other fasteners 15, which provides corrosion protection. Alternatively, multiple protective plates can be connected by brazing in addition to structural adhesive to achieve the same effect.

[0188] In this embodiment, the protective plate assembly 14 not only improves the bottom's impact resistance, but also reduces abnormal noise through the double-layer buffer structure, and achieves bottom heat preservation for the battery device.

[0189] 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, The battery includes a battery housing and individual battery cells disposed within the battery housing. The battery housing includes a housing body and a protective plate assembly. The housing body includes a support plate for supporting the individual battery cells. The protective plate assembly is located outside the housing body and is stacked and connected to the support plate. The protective plate assembly includes multiple buffer layers and multiple protective plates alternately arranged along a first direction.

2. The battery device as claimed in claim 1, characterized in that, At least one of the protective plates and the support plate form a sealed cavity, and at least one of the buffer layers is disposed in the sealed cavity.

3. The battery device as claimed in claim 1, characterized in that, In the first direction, the guard plate with the smallest distance from the support plate among all the guard plates is designated as the first guard plate, and the guard plate with the largest distance from the support plate among all the guard plates is designated as the second guard plate. At least one of the first and second protective plates and the support plate form a sealed cavity.

4. The battery device as claimed in claim 3, characterized in that, At least a portion of the first protective plate is sealed to at least a portion of the support plate by a first sealing structure, forming a first receiving cavity, and the buffer layer located between the first protective plate and the support plate is disposed in the first receiving cavity.

5. The battery device as claimed in claim 4, characterized in that, The first sealing structure includes a welded structure and / or a sealant layer.

6. The battery device according to any one of claims 3-5, characterized in that, The thickness of the second protective plate is greater than or equal to the thickness of the first protective plate.

7. The battery device according to any one of claims 1-5, characterized in that, At least a portion of two adjacent protective plates are sealed together by a second sealing structure to form a second receiving cavity, and the buffer layer located between the two adjacent protective plates is disposed in the second receiving cavity.

8. The battery device as claimed in claim 7, characterized in that, The second sealing structure includes a welded structure and / or a sealant layer.

9. The battery device according to any one of claims 1-5, characterized in that, At least part of the guard plate is also connected to the support plate by fasteners.

10. The battery device as claimed in claim 9, characterized in that, The fasteners are designed to avoid the buffer layer.

11. The battery device as claimed in claim 9, characterized in that, Among all the guard plates connected to the support plate by the fasteners, the guard plate with the largest distance from the support plate in the first direction is denoted as the target guard plate; The target guard plate is provided with a through hole for the fastener to pass through, and a third sealing structure is provided between the outer wall of the fastener and the inner wall of the through hole. The third sealing structure is used to seal the gap between the outer wall of the fastener and the inner wall of the through hole.

12. The battery device as claimed in claim 11, characterized in that, The third sealing structure includes a sealing ring fitted over the fastener, at least a portion of which is interference-fitted with the gap.

13. The battery device as claimed in claim 9, characterized in that, The protective plate includes a plate body and a protrusion. The plate body is disposed opposite to the support plate. The protrusion is disposed around the plate body and connected to the plate body. At least a portion of the protrusion protrudes toward the support plate. The protective plate is sealed to the support plate or an adjacent protective plate through the protrusion. At least a portion of the plate body of the protective plate is connected to the support plate through the fastener.

14. The battery device as claimed in claim 9, characterized in that, The main body of the enclosure includes a main body and a support beam. The support beam and the battery cells are both located within the main body, and at least a portion of the battery cells abut against at least a portion of the support beam. The position of the fastener corresponds to the position of the support beam.

15. The battery device according to any one of claims 1-5, characterized in that, At least two of the protective panels have the same structure.

16. The battery device according to any one of claims 1-5, characterized in that, At least part of the buffer layer is located in a position that corresponds to the position of the battery cell.

17. The battery device according to any one of claims 1-5, characterized in that, The buffer layer includes multiple buffer sections arranged in an array.

18. The battery device as claimed in claim 17, characterized in that, In the same buffer layer, at least two adjacent buffer sections are arranged at intervals.

19. The battery device as claimed in claim 17, characterized in that, The buffer section is a foam section.

20. The battery device as claimed in claim 17, characterized in that, At least one of the protective plates has a reinforcing structure in at least the area covered by the buffer portion.

21. The battery device as claimed in claim 20, characterized in that, The reinforcing structure is integrally formed on the protective plate.

22. The battery device as claimed in claim 20, characterized in that, At least a portion of the reinforcing structure protrudes in a direction away from the support plate.

23. The battery device according to any one of claims 1-5, characterized in that, The support plate is equipped with a liquid cooling structure.

24. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-23.

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