Battery device, electric device and energy storage device

Abstract

The application provides a battery device, a power utilization equipment and an energy storage equipment, and belongs to the technical field of batteries. The battery device comprises a box body with a containing cavity; a battery monomer accommodated in the containing cavity; and a bottom guard plate assembly arranged at the bottom of the box body, wherein the bottom guard plate assembly comprises a first protection piece and a second protection piece which are arranged in a stacking manner along a first direction, the second protection piece is located on the side of the first protection piece away from the containing cavity, and a sealed containing cavity is defined between the first protection piece and the second protection piece, and the sealed containing cavity is filled with a heat-resistant gas. Through the technical scheme, the heat preservation performance of the battery device can be improved, and thus the use performance of the battery device can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] In related technologies, the bottom of the battery device is usually equipped with a bottom protective plate. In order to improve the heat preservation effect of the battery device, the conventional method is to apply adhesive to the bottom protective plate for heat preservation. However, this method has poor heat preservation effect and affects the performance of the battery device. Utility Model Content

[0004] This application aims to at least solve one of the technical problems existing in the background art. Therefore, one object of this application is to provide a battery device, electrical appliance, and energy storage device to improve the thermal insulation performance of the battery device and enhance its overall performance.

[0005] An embodiment of the first aspect of this application provides a battery device, including: a housing having a receiving cavity; a battery cell housed in the receiving cavity; and a bottom protective plate assembly disposed at the bottom of the housing. The bottom protective plate assembly includes a first protective member and a second protective member stacked along a first direction. The second protective member is located on the side of the first protective member opposite to the receiving cavity and defines a sealed cavity between the second and the first protective member. The sealed cavity is filled with a heat-resistant gas.

[0006] In the technical solution of this application embodiment, a bottom protective plate assembly is provided at the bottom of the battery device's casing. The bottom protective plate assembly includes a first protective member and a second protective member. The first and second protective members are configured as a double-layer structure stacked along a first direction, forming a sealed cavity between them. Simultaneously, a heat-insulating gas is filled inside the sealed cavity. Utilizing the low thermal conductivity of the sealed cavity and its internal heat-insulating gas, the rate of temperature transfer between the external environment and the inside of the casing can be slowed down. Compared to the conventional method of simply spraying resin adhesive onto the surface of the bottom protective plate, this effectively improves the overall thermal insulation performance of the battery device, thereby enhancing its performance. Furthermore, it eliminates the need for surface adhesive coating for insulation, facilitating subsequent cleaning and maintenance of the bottom protective plate assembly surface.

[0007] In some embodiments, the second protective member includes a main body plate and an edge plate surrounding the periphery of the main body plate. At least a portion of the main body plate is recessed in a direction away from the first protective member to form a receiving groove. The edge plate is sealed to the first protective member to form a closed cavity between the second protective member and the first protective member.

[0008] By recessing at least a portion of the main body plate of the second protective component to form a receiving groove, and then sealingly connecting it with the edge plate on the periphery of the main body plate and the first protective component, a sealed cavity can be enclosed. This structural form can regularly define the forming space of the sealed cavity, facilitating the stable filling of heat-resistant gas in the area corresponding to the receiving groove. This allows the heat-resistant gas to be evenly distributed in the position between the bottom protective plate assembly and the box body, which is beneficial for the stable isolation of ambient temperature transfer, and at the same time facilitates the sealed assembly with the first and second protective components.

[0009] In some embodiments, the main body plate includes recessed segments and protruding segments that are alternately connected in sequence along a second direction, and the first direction and the second direction are intersecting.

[0010] The main body plate includes recessed sections and raised sections that are alternately connected along the second direction, thereby increasing the structural area and structural strength of the second protective component. At the same time, the alternating connection of the recessed and raised sections creates a staggered gas distribution space inside the sealed cavity, extending the heat transfer path between the bottom protective plate components and further weakening the heat conduction efficiency, thus helping to improve the thermal insulation performance of the battery device.

[0011] In some embodiments, the surfaces of the raised and / or recessed segments are arcuate surfaces.

[0012] By setting the surface of at least one of the raised and recessed sections to an arc-shaped surface, stress concentration at the structural transition between the raised and recessed sections can be reduced, improving the overall structural toughness of the main panel and reducing the likelihood of cracking and deformation due to vibration, impact, or compression during use. Simultaneously, the arc-shaped transition allows for a more uniform airflow distribution within the sealed cavity, reducing localized heat accumulation and helping to maintain a stable thermal insulation state.

[0013] In some embodiments, there is a gap between the protruding section and the first protective member; or, at least one protruding section is sealed to the first protective member to divide the sealed cavity into at least two sub-sealed cavities.

[0014] When a gap is reserved between the protruding section and the first protective component, the sealed cavity can form a continuous gas flow space, which facilitates the full filling and even spreading of heat-insulating gas in the sealed cavity, so as to maintain the stability of the overall heat insulation performance.

[0015] When at least one protruding section is sealed to the first protective component, the original sealed cavity can be divided into multiple independent sub-sealing cavities. Each sub-sealing cavity can maintain a stable gas insulation environment. Even if a small amount of air leakage occurs in a local area, the remaining sub-sealing cavities can still perform their insulation function normally, thereby improving the fault tolerance and operational stability of the bottom protective plate assembly insulation structure.

[0016] In some embodiments, the bottom guard assembly further includes a seal disposed between the first guard and the edge plate.

[0017] By setting a seal between the edge plates of the first protective component and the second protective component to fill the assembly gap between the assembly mating surfaces of the first protective component and the edge plates, the sealing performance of the sealed cavity can be improved, the risk of heat-insulating gas inside the sealed cavity escaping outward can be reduced, the gas concentration inside the sealed cavity can be kept stable, the heat-insulating gas can maintain a good heat insulation effect for a long time, and the stability and continuity of the heat preservation effect of the battery device can be improved.

[0018] In some embodiments, the seal includes foam or rubber.

[0019] Foam or rubber components are used as sealants. These components possess excellent elastic deformation capabilities, allowing them to adapt to subtle differences in flatness between the mating surfaces of the first protective component and the edge plate, and to seamlessly fill any tiny gaps. Furthermore, the foam or rubber components exhibit good resistance to environmental temperature variations, maintaining a sealed fit over extended periods, thus meeting the requirements of long-term outdoor use and complex operating conditions for battery devices.

[0020] In some embodiments, the edge plate is provided with a first limiting groove on the side facing the first protective member along the first direction. The first limiting groove extends circumferentially along the receiving groove. The first protective member is provided with a first protruding rib on the side facing the edge plate along the first direction. The position of the first protruding rib corresponds to the position of the first limiting groove. The first protruding rib is inserted into the first limiting groove, and part of the sealing member is pressed into the first limiting groove by the first protruding rib.

[0021] By providing a first limiting groove on the side of the edge plate facing the first protective member along the first direction, and providing a first protruding rib on the first protective member corresponding to the position of the first limiting groove, the first protruding rib and the first limiting groove can be interlocked to achieve assembly positioning of the first protective member and the second protective member, improving the convenience of their alignment and assembly. Simultaneously, a portion of the sealing element can be pressed between the first protruding rib and the first limiting groove to tighten the sealing element, enhancing the tightness of the fit between the sealing element and the first and second protective members, further improving the sealing effect, and reducing the risk of heat-resistant gas leakage.

[0022] In some embodiments, the edge plate is further provided with a second limiting groove on the side facing the first protective member along the first direction. The second limiting groove extends circumferentially along the receiving groove and is located on the side of the first limiting groove facing away from the receiving groove along the second direction. The box body is provided with a second protruding rib on the side facing the edge plate along the first direction. The position of the second protruding rib corresponds to the position of the second limiting groove. The second protruding rib is inserted into the second limiting groove, and a portion of the sealing member is pressed into the second limiting groove by the second protruding rib. The first direction and the second direction are intersecting. Alternatively, the edge plate is further provided with a second protruding rib on the side facing the first protective member along the first direction. The second protruding rib extends circumferentially along the receiving groove and is located on the side of the first limiting groove facing away from the receiving groove along the second direction. The box body is provided with a second limiting groove on the side facing the edge plate along the first direction. The position of the second limiting groove corresponds to the position of the second protruding rib. The second protruding rib is inserted into the second limiting groove, and a portion of the sealing member is pressed into the second limiting groove by the second protruding rib. The first direction and the second direction are intersecting.

[0023] By adding a second limiting groove on the side of the edge plate facing the first protective member, and providing a second protruding rib on the housing that engages with the second limiting groove, or by providing a second protruding rib on the side of the edge plate facing the first protective member, and providing a second limiting groove on the housing that engages with the second protruding rib, the assembly of the bottom protective plate assembly and the housing can be limited, thus improving the assembly efficiency of the bottom protective plate assembly and the housing. Simultaneously, some sealing elements are pressed between the second protruding rib and the second limiting groove to fill the assembly gap between the edge plate and the housing. This not only reduces the intrusion of external moisture and dust from the gaps but also further maintains the sealed environment of the sealed cavity, improving the stability of the battery device's thermal insulation.

[0024] In some embodiments, the surfaces of the first protective member and / or the second protective member are coated with a thermal insulation coating.

[0025] By applying an insulating coating to the surface of at least one of the first and second protective components, the insulation coating can further block the temperature transfer between the external environment and the inside of the enclosure, based on the double-layer plate structure and heat-insulating gas of the bottom protective plate assembly, thereby further improving the overall thermal insulation performance of the battery device.

[0026] In some embodiments, the housing includes a housing frame and a heat exchange plate. The heat exchange plate is disposed at the bottom of the housing frame and defines a receiving cavity between the heat exchange plate and the housing frame. The heat exchange plate is provided with a heat exchange channel for circulating a heat exchange medium. The bottom guard plate assembly is disposed on the side of the heat exchange plate away from the receiving cavity along a first direction.

[0027] The heat exchange medium flows through the heat exchange channels inside the heat exchange plate, which can regulate the temperature of the battery cells inside the housing. At the same time, the bottom protective plate assembly is set on the outside of the heat exchange plate, which can provide thermal insulation protection for the heat exchange plate and the battery cells inside the housing from the bottom, reducing the impact of external ambient temperature fluctuations on the temperature of the heat exchange medium in the heat exchange channels and the operating temperature of the battery cells, and helping to maintain the stability of the operating temperature of the battery cells.

[0028] In some embodiments, the battery device further includes fasteners, and the second protective member has a connection hole through which the fastener passes and is fixedly connected to the housing frame.

[0029] By using fasteners to pass through the connection holes of the second protective component and securely connect it to the housing frame, the reliability of the bottom protective plate assembly and its fixation to the housing frame is improved, and disassembly and maintenance are facilitated. Simultaneously, the fasteners provide clamping force to the seals, thereby enhancing the reliability of the seal assembly and fixation.

[0030] In some embodiments, the first protective member and / or the second protective member are provided with an injection port, which is equipped with an injection valve and is used to inject heat-resistant gas into the sealed cavity.

[0031] At least one of the first and second protective components is provided with an injection port with an injection valve, which allows for the replenishment or replacement of heat-insulating gas into the sealed cavity during production assembly and later use and maintenance. This enables the gas state inside the sealed cavity to be adjusted in a timely manner according to the wear and tear, so that the sealed cavity can maintain a stable heat insulation capacity for a long time and improve the convenience of later maintenance of the entire battery device.

[0032] In some embodiments, the heat-resistant gas includes one of xenon, krypton, argon, carbon dioxide, and nitrogen.

[0033] By using one of xenon, krypton, argon, carbon dioxide, and nitrogen as the heat-insulating gas to fill the sealed cavity, these gases, each with low thermal conductivity, possess excellent heat insulation capabilities and can effectively slow down the rate of heat conduction between the bottom protective plate assembly and the casing. Different gases can also be flexibly selected according to the application scenario and heat insulation level requirements to adapt to the heat preservation needs of the battery device under different operating conditions.

[0034] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0035] An embodiment of the third aspect of this application provides an energy storage device, which includes the battery device described in the above embodiments, the battery device being used to store electrical energy.

[0036] 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

[0037] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0038] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 2 This is an exploded view of the battery device according to some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 4 This is a bottom view structural diagram of a battery device according to some embodiments of this application; Figure 5 for Figure 4 A schematic diagram of a partial cross-sectional view along the AA direction; Figure 6 This is a partially exploded structural diagram of a battery device according to some embodiments of this application; Figure 7 for Figure 6 A magnified structural diagram of section B.

[0039] Explanation of reference numerals in the attached figures: 1000, vehicles; 100. Battery assembly; 200. Controller; 300. Motor; 10. Housing; 11. First housing; 12. Second housing; 121. Housing frame; 1211. Second rib; 122. Heat exchange plate; 20. Battery cell; 21. End cap; 211. Electrode terminal; 22. Housing; 23. Electrode assembly; 23a. Tab; 30. Bottom guard plate assembly; 31. First protective component; 311. First protruding rib; 32. Second protective component; 321. Main body plate; 3211. Recessed section; 3212. Protruding section; 322. Edge plate; 3221. First limiting groove; 3222. Second limiting groove; 323. Receiving groove; 33. Sealing component; 34. Sealed cavity; X represents the first direction; Y represents the second direction. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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).

[0046] 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.

[0047] 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.

[0048] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0049] In related technologies, a bottom protective plate is usually provided at the bottom of the battery device. In order to improve the heat preservation effect of the battery device, the conventional method is to apply adhesive to the bottom protective plate for heat preservation. However, this method has poor heat preservation effect and affects the performance of the battery cells.

[0050] To address the issue of poor heat insulation in battery devices, this application presents a battery device design. By installing a bottom protective plate assembly at the bottom of the battery device's casing, and configuring the bottom protective plate assembly as a double-layer structure consisting of a first protective component and a second protective component, a sealed cavity is formed between the two. Simultaneously, the sealed cavity is filled with a heat-insulating gas. Utilizing the low thermal conductivity of the sealed cavity and its internal heat-insulating gas, the rate of temperature transfer between the external environment and the interior of the casing can be slowed down. Compared to the conventional method of simply spraying resin adhesive onto the surface of the bottom protective plate, this design effectively improves the overall heat insulation performance of the battery device, thereby enhancing its usability.

[0051] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment or energy storage devices such as vehicles, ships, or aircraft. A power system for such electrical equipment or energy storage device can be constructed using the battery device disclosed in this application, thereby effectively improving the overall thermal insulation performance of the battery device and thus enhancing its performance.

[0052] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is 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.

[0053] This application also provides an energy storage device that uses a battery device as a power source. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0054] 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.

[0055] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 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 device 100 is installed inside the vehicle 1000, and the battery device 100 can be located 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. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0056] 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.

[0057] Please refer to Figures 2 to 5 , Figure 2 This is an exploded view of the battery device according to some embodiments of this application; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application; Figure 4This is a bottom view structural diagram of a battery device according to some embodiments of this application; Figure 5 for Figure 4 A cross-sectional view along the AA direction. This application provides a battery device 100, including: a housing 10, a battery cell 20, and a bottom protective plate assembly 30. The housing 10 has a receiving cavity; the battery cell 20 is housed within the receiving cavity; the bottom protective plate assembly 30 is disposed at the bottom of the housing 10, and includes a first protective member 31 and a second protective member 32 stacked along a first direction X. The second protective member 32 is located on the side of the first protective member 31 facing away from the receiving cavity, and defines a sealed cavity 34 between the second and first protective members 31, the sealed cavity 34 being filled with a heat-resistant gas.

[0058] In some embodiments, the housing 10 may include a first housing 11 and a second housing 12, which overlap each other, and together define a receiving cavity for accommodating the battery cell 20. The second housing 12 may be a hollow structure with one open end, and the first housing 11 may be a plate-like structure, with the first housing 11 covering the open side of the second housing 12 so that the first housing 11 and the second housing 12 together define the receiving cavity; alternatively, the first housing 11 and the second housing 12 may both be hollow structures with one open side, with the open side of the first housing 11 covering the open side of the second housing 12. Of course, the housing 10 formed by the first housing 11 and the second housing 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0059] In some embodiments, the housing 10 may include a top cover, a housing frame 121, and a bottom plate, with the top cover and bottom plate respectively connected to the housing frame 121, so that the interior of the housing 10 forms a closed receiving cavity to accommodate the battery cells 20. As an example, the bottom plate may be a heat exchange plate 122.

[0060] As an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, the top cover of the housing 10 can be at least part of the floor of the vehicle 1000, or the housing frame of the housing 10 can be at least part of the crossbeams and longitudinal beams of the vehicle 1000.

[0061] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0062] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0063] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up the battery. For example... Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0064] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on end cap 21. Electrode terminals 211 can be used for electrical connection with electrode assembly 23 for outputting or inputting electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0065] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0066] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode plates without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals to form a current loop.

[0067] Understandably, the first direction X is the thickness direction of the second protective component 32 and the first protective component 31.

[0068] The second protective member 32 is located on the side of the first protective member 31 away from the receiving cavity. That is, the first protective member 31 is located close to or connected to the housing 10, and the second protective member 32 is located on the side of the first protective member 31 away from the housing 10.

[0069] As an example, both the first protective member 31 and the second protective member 32 are plate structures. For example, both the first protective member 31 and the second protective member 32 can be metal plates.

[0070] Understandably, the second protective member 32 may be partially recessed away from the first protective member 31, or the first protective member 31 may be partially recessed away from the second protective member 32, and the two are sealed together around the recessed area, thereby defining a sealed cavity 34 between the second protective member 32 and the first protective member 31.

[0071] In some embodiments, the heat-resistant gas is a gas with a low thermal conductivity, such as xenon, krypton, argon, nitrogen, etc.

[0072] In the technical solution of this application embodiment, a bottom protective plate assembly 30 is provided at the bottom of the housing 10 of the battery device 100. The bottom protective plate assembly 30 includes a first protective member 31 and a second protective member 32 stacked along the first direction X, and a sealed cavity 34 is provided between the first protective member 31 and the second protective member 32. By filling the sealed cavity 34 with heat-insulating gas, the low thermal conductivity of the sealed cavity 34 and the heat-insulating gas inside it can slow down the rate of temperature transfer between the external environment and the inside of the housing 10. Compared with the conventional method of spraying resin glue only on the surface of the bottom protective plate, the overall heat preservation performance of the battery device 100 can be effectively improved. At the same time, it does not need to rely on the setting of heat preservation by coating the surface of the bottom protective plate, which facilitates the cleaning and maintenance of the surface of the bottom protective plate assembly 30 in the later stage.

[0073] Please refer to Figures 5 to 7 , Figure 6 A partially exploded view of a battery device provided in some embodiments of this application; Figure 7 for Figure 6 Enlarged structural schematic diagram of part B. According to some embodiments of this application, the second protective member 32 includes a main body plate 321 and an edge plate 322 surrounding the periphery of the main body plate 321. At least a portion of the main body plate 321 is recessed in a direction away from the first protective member 31 to form a receiving groove 323. The edge plate 322 is sealed to the first protective member 31 so that a closed cavity 34 is formed between the second protective member 32 and the first protective member 31.

[0074] As an example, at least a portion of the main body plate 321 is recessed in a direction away from the first protective member 31 to form one or more receiving grooves 323. When there are multiple receiving grooves 323, the multiple receiving grooves 323 may or may not be connected to each other.

[0075] As an example, the edge plate 322 is a flat plate used for sealing connection with the first protective member 31. For example, the edge plate 322 can be directly bonded or welded to the first protective member 31, or a sealing connection can be achieved between the edge plate 322 and the first protective member 31 by filling a sealing structure.

[0076] By partially recessing at least a portion of the main body plate 321 to form a receiving groove 323, and then sealingly connecting it with the edge plate 322 on the periphery of the main body plate 321 and the first protective member 31, a sealed cavity 34 can be enclosed. This structural form can regularly define the forming space of the sealed cavity 34, which facilitates the stable filling of heat-resistant gas in the area corresponding to the receiving groove 323. This allows the heat-resistant gas to be evenly distributed in the position opposite to the bottom protective plate assembly 30 and the box body 10, which is beneficial for the stable isolation of the transmission of ambient temperature. At the same time, it facilitates the sealed assembly with the first protective member 31 and the second protective member 32.

[0077] Please refer to Figure 5 According to some embodiments of this application, the main body plate 321 includes recessed segments 3211 and protruding segments 3212 that are alternately connected along the second direction Y, and the first direction X intersects the second direction Y.

[0078] As an example, the second direction Y can be the length direction or the width direction of the box 10.

[0079] Understandably, the recessed section 3211 is formed by at least a portion of the main body plate 321 being recessed in a direction away from the first protective member 31, and the protruding section 3212 is formed by the main body plate 321 being partially protruded in a direction closer to the first protective member 31 compared to the recessed section 3211.

[0080] As an example, the lowest point of each recessed segment 3211 is located on the same plane, and the highest point of each raised segment 3212 is located on the same plane. Both the lowest and highest points are relative to the plane where the first protective member 31 is located. As an example, the recessed segment 3211 and the raised segment 3212 are integrally connected.

[0081] As an example, the recessed section 3211 and the raised section 3212 are smoothly connected, thereby improving the second protective member 32's resistance to compression and deformation.

[0082] In some embodiments, along the arrangement direction of the bottom guard plate assembly 30 to the housing 10, the projected area of ​​the main body plate is not less than 50% of the projected area of ​​the housing.

[0083] The main body plate 321 includes recessed sections 3211 and raised sections 3212 alternately connected along the second direction Y, thereby increasing the structural area and structural strength of the second protective member 32. Simultaneously, the alternating connection of the recessed sections 3211 and raised sections 3212 creates a staggered gas distribution space within the sealed cavity 34, extending the heat transfer path between the bottom protective plate assemblies 30 and further reducing heat conduction efficiency, thus helping to improve the thermal insulation performance of the battery device.

[0084] Please refer to Figure 5According to some embodiments of this application, the surfaces of the protruding segment 3212 and / or the recessed segment 3211 are arc-shaped curved surfaces.

[0085] Understandably, an arcuate surface is a curved surface with a certain curvature. At least one of the protruding segment 3212 and the recessed segment 3211 has an arcuate surface, meaning either the surface of the protruding segment 3212 is an arcuate surface, or the surface of the recessed segment 3211 is an arcuate surface, or both the surfaces of the protruding segment 3212 and the recessed segment 3211 are arcuate surfaces. Specifically, both the inner and outer surfaces of the protruding segment 3212 and the recessed segment 3211 are arcuate surfaces. The inner surface is the side of the protruding segment 3212 or the recessed segment 3211 facing the first protective member 31, and the outer surface is the side of the protruding segment 3212 or the recessed segment 3211 facing away from the first protective member 31.

[0086] By setting the surface of at least one of the protruding section 3212 and the recessed section 3211 to an arc-shaped surface, the stress concentration at the structural transition point between the protruding section 3212 and the recessed section 3211 can be reduced, improving the overall structural toughness of the main body plate 321 and reducing the possibility of cracking and deformation due to vibration, collision, and compression during use. At the same time, the transition form of the arc-shaped surface can make the airflow distribution inside the sealed cavity 34 more uniform, reducing the phenomenon of heat accumulation in local areas and helping to maintain a stable thermal insulation state.

[0087] According to some embodiments of this application, there is a gap between the protruding section 3212 and the first protective member 31; or, at least one protruding section 3212 is sealed to the first protective member 31 to divide the sealed cavity 34 into at least two sub-sealed cavities.

[0088] Understandably, there is a gap between the protruding section 3212 and the first protective member 31, meaning that the protruding section 3212 and the first protective member 31 are not connected. When the protruding section 3212 and the first protective member 31 are sealed together, they can be connected by means of adhesive bonding or welding.

[0089] Please refer to Figure 5 When a gap is reserved between the protruding section 3212 and the first protective component 31, the sealed cavity 34 can form a continuous gas flow space, which facilitates the full filling and uniform spreading of heat-insulating gas in the sealed cavity 34, so as to maintain the stability of the overall heat insulation performance.

[0090] When at least one protruding section 3212 is sealed to the first protective member 31, the original sealed cavity 34 can be divided into multiple independent sub-sealing cavities. Each sub-sealing cavity can maintain a stable gas insulation environment. Even if a small amount of gas leakage occurs in a local area, the remaining sub-sealing cavities can still play a normal role in heat insulation, thereby improving the fault tolerance and operational stability of the insulation structure of the bottom protective plate assembly 30.

[0091] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, the bottom guard plate assembly 30 further includes a seal 33, which is arranged in a ring between the first guard plate 31 and the edge plate 322.

[0092] Understandably, the sealing element 33 is arranged around the periphery of the sealed cavity 34 to seal the gap between the first protective element 31 and the edge plate 322.

[0093] As an example, the seal 33 can be pressed between the first protective member 31 and the edge plate 322, or it can be bonded between the first protective member 31 and the edge plate 322.

[0094] By providing a sealing element 33 between the edge plates 322 of the first protective element 31 and the second protective element 32 to fill the assembly gap between the assembly mating surfaces of the first protective element 31 and the edge plates 322, the sealing performance of the sealed cavity 34 can be improved, the risk of heat-insulating gas inside the sealed cavity 34 escaping outward can be reduced, the gas concentration inside the sealed cavity 34 can be kept stable, the heat-insulating gas can maintain a good heat insulation effect for a long time, and the stability and continuity of the heat preservation effect of the battery device can be improved.

[0095] According to some embodiments of this application, the seal 33 includes foam or rubber.

[0096] As an example, the seal 33 can be a polyurethane foam layer, a polystyrene foam layer, a polypropylene foam layer, a rubber seal 33, etc.

[0097] Foam or rubber components are used as the sealing element 33. The foam or rubber components themselves have good elastic deformation ability, which can adapt to the slight flatness difference of the assembly and mating surfaces of the first protective component 31 and the edge plate 322, and fit and fill the tiny gaps. At the same time, the foam or rubber components have good resistance to changes in environmental temperature, which can maintain a sealed fit for a long time, and meet the needs of the battery device for long-term outdoor use and complex working conditions.

[0098] Please refer to Figure 5 According to some embodiments of this application, the edge plate 322 is provided with a first limiting groove 3221 on the side facing the first protective member 31 along the first direction X. The first limiting groove 3221 extends circumferentially along the receiving groove 323. The first protective member 31 is provided with a first protruding rib 311 on the side facing the edge plate 322 along the first direction X. The position of the first protruding rib 311 corresponds to the position of the first limiting groove 3221. The first protruding rib 311 is inserted into the first limiting groove 3221, and part of the sealing member 33 is pressed into the first limiting groove 3221 by the first protruding rib 311.

[0099] As an example, the first limiting groove 3221 is formed by a local recess in the area of ​​the edge plate 322 near the sealing groove.

[0100] As an example, the first rib 311 can be a flange formed by folding a portion of the periphery of the first protective member 31 toward the edge plate 322.

[0101] By providing a first limiting groove 3221 on the side of the edge plate 322 facing the first protective member 31 along the first direction X, and providing a first protruding rib 311 on the first protective member 31 corresponding to the position of the first limiting groove 3221, the first protruding rib 311 and the first limiting groove 3221 are interlocked, which enables the assembly and positioning of the first protective member 31 and the second protective member 32, improving the convenience of their alignment and assembly. At the same time, a portion of the sealing member 33 can be pressed between the first protruding rib 311 and the first limiting groove 3221 to provide a pressing effect on the sealing member 33, enhancing the tightness of the fit between the sealing member 33 and the first and second protective members 31 and 32, further improving the sealing effect, and reducing the risk of heat-resistant gas leakage.

[0102] Please refer to Figure 5 According to some embodiments of this application, the edge plate 322 is further provided with a second limiting groove 3222 on the side of the first protective member 31 along the first direction X. The second limiting groove 3222 extends circumferentially along the receiving groove 323 and is located on the side of the first limiting groove 3221 away from the receiving groove 323 along the first direction X. The box body 10 is provided with a second protruding rib 1211 on the side of the edge plate 322 along the first direction X. The position of the second protruding rib 1211 corresponds to the position of the second limiting groove 3222. The second protruding rib 1211 is inserted into the second limiting groove 3222, and part of the sealing member 33 is pressed into the second limiting groove 3222 by the second protruding rib 1211. The first direction X and the second direction Y are intersected. Alternatively, the edge plate 322 is provided with a second rib 1211 on the side facing the first protective member 31 along the first direction X. The second rib 1211 extends circumferentially along the receiving groove 323 and is located on the side of the first limiting groove 3221 facing away from the receiving groove 323 along the second direction Y. The box body 10 is provided with a second limiting groove 3222 on the side facing the edge plate 322 along the first direction X. The position of the second limiting groove 3222 corresponds to the position of the second rib 1211. The second rib 1211 is inserted into the second limiting groove 3222, and part of the sealing member 33 is pressed into the second limiting groove 3222 by the second rib 1211. The first direction X and the second direction Y are intersected.

[0103] As an example, the second limiting groove 3222 is arranged in parallel with the first limiting groove 3221, and the second limiting groove 3222 and the first limiting groove 3221 are not connected to each other.

[0104] As an example, the second rib 1211 is formed by a partial convex extension of the bottom of the box 10 along the circumference of the box 10.

[0105] Understandably, along the arrangement direction from the first protective member 31 to the second protective member 32, the projected area of ​​the second protective member 32 is larger than the projected area of ​​the first protective member 31, and some of the sealing members 33 are also disposed between the edge plate 322 and the housing 10.

[0106] By adding a second limiting groove 3222 on the side of the edge plate 322 facing the first protective member 31, and providing a second protruding rib 1211 on the housing 10 to engage with the second limiting groove 3222, or by providing a second protruding rib 1211 on the side of the edge plate 322 facing the first protective member 31, and providing a second limiting groove 3222 on the housing 10 to engage with the second protruding rib 1211, with the second protruding rib 1211 inserted into the second limiting groove 3222, the assembly limiting between the bottom protective plate assembly 30 and the housing 10 can be achieved, improving the assembly efficiency of the bottom protective plate assembly 30 and the housing 10. Simultaneously, a portion of the sealing member 33 is pressed between the second protruding rib 1211 and the second limiting groove 3222 to fill the assembly gap between the edge plate 322 and the housing 10. This not only reduces the intrusion of external moisture and dust from the gaps but also further maintains the sealed environment of the sealed cavity 34, improving the stability of the battery device's heat insulation.

[0107] According to some embodiments of this application, the surfaces of the first protective member 31 and / or the second protective member 32 are coated with a thermal insulation coating.

[0108] It is understood that a thermal insulation coating may be applied to the surface of the first protective member 31 or the second protective member 32, or the thermal insulation coating may be applied to the surface of the first protective member 31 and the second protective member 32, wherein the aforementioned surface refers to at least one of the inner surface and the outer surface.

[0109] As an example, the thermal insulation coating can be a hollow glass microsphere coating, a hollow ceramic microsphere coating, an aerogel thermal insulation coating, etc.

[0110] By applying a thermal insulation coating to the surface of at least one of the first protective member 31 and the second protective member 32, the thermal insulation performance of the battery device can be further improved by utilizing the low thermal conductivity of the thermal insulation coating itself, which is based on the double-layer plate structure and heat-insulating gas of the bottom protective plate assembly 30.

[0111] Please refer to Figure 5According to some embodiments of this application, the housing 10 includes a housing frame 121 and a heat exchange plate 122. The heat exchange plate 122 is disposed at the bottom of the housing frame 121 and defines a receiving cavity between the heat exchange plate 122 and the housing frame 121. A heat exchange channel is provided in the heat exchange plate 122 for circulating heat exchange medium. The bottom guard plate assembly 30 is disposed on the side of the heat exchange plate 122 away from the receiving cavity along the first direction X.

[0112] In some embodiments, the housing also includes a top cover, the top opening of the housing frame 121 can be closed by the top cover, and the bottom opening of the housing frame 121 is closed by the heat exchange plate 122.

[0113] As an example, there can be multiple heat exchange channels, which are interconnected. Each heat exchange channel has an inlet and an outlet, which are connected to an inlet pipe and an outlet pipe, respectively.

[0114] As an example, the heat exchange medium can be water, air, etc.

[0115] Specifically, the first protective component 31 is attached to the heat exchange plate 122.

[0116] The heat exchange medium flows through the heat exchange channels inside the heat exchange plate 122, which can regulate the temperature of the battery cells 20 inside the cavity. At the same time, the bottom protective plate assembly 30 is correspondingly arranged on the outside of the heat exchange plate 122, which can form heat insulation protection for the heat exchange plate 122 and the internal battery cells 20 from the bottom, reducing the impact of external ambient temperature fluctuations on the temperature of the heat exchange medium in the heat exchange channels and the operating temperature of the battery cells 20, and helping to maintain the stability of the operating environment temperature of the battery cells 20.

[0117] According to some embodiments of this application, the battery device further includes fasteners, and the second protective member 32 is provided with a connection hole. The fasteners pass through the connection hole and are fixedly connected to the housing frame 121.

[0118] As an example, the fasteners can be bolts, screws, etc. There are multiple fasteners, which are spaced apart circumferentially along the housing frame 121. The bottom guard plate assembly 30 is fixedly connected to the housing frame 121 by the multiple fasteners.

[0119] As an example, the fasteners and connecting holes are both located on the edge plate 322 and on the side of the second limiting groove 3222 away from the sealed cavity 34.

[0120] By using fasteners to pass through the connecting holes of the second protective member 32 and to fix it to the housing frame 121, the reliability of the assembly and fixation of the bottom protective plate assembly 30 and the housing frame 121 is improved, and disassembly and maintenance are facilitated. At the same time, the fasteners can provide clamping force on the seal 33 to improve the reliability of the assembly and fixation of the seal 33.

[0121] According to some embodiments of this application, the first protective member 31 and / or the second protective member 32 are provided with an air injection hole, and the air injection hole is equipped with an air injection valve. The air injection hole is used to inject heat-resistant gas into the sealed cavity 34.

[0122] As an example, at least one of the second protective member 32 and the second protective member 32 is provided with an injection port, and the number of injection ports can be one or more. The injection valve is a valve that can adjust the amount of gas injected into the sealed cavity 34, for example, it can be a self-sealing rubber valve plug, and the gas can be released when the injection valve is opened.

[0123] By providing an injection port with an injection valve on at least one of the first protective component 31 and the second protective component 32, it is convenient to replenish or replace the heat-insulating gas into the sealed cavity 34 during the production assembly and later use and maintenance stages. This allows the gas state inside the sealed cavity 34 to be adjusted in a timely manner according to the wear and tear, so that the sealed cavity 34 can maintain a stable heat insulation capacity for a long time and improve the convenience of later maintenance of the entire battery device.

[0124] According to some embodiments of this application, the heat-resistant gas includes one of xenon, krypton, argon, carbon dioxide, and nitrogen.

[0125] It is understandable that xenon, krypton, argon, carbon dioxide, and nitrogen are all gases with low thermal conductivity.

[0126] By using one of xenon, krypton, argon, carbon dioxide, and nitrogen as the heat-insulating gas filling the sealed cavity 34, each of these gases has a low thermal conductivity and good heat insulation capabilities, effectively slowing down the rate of temperature conduction between the bottom protective plate assembly 30 and the housing 10. Different gases can also be flexibly selected according to the application scenario and heat insulation level requirements to adapt to the heat preservation needs of the battery device under different operating conditions.

[0127] This application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0128] The electrical device provided in this application includes the battery device described in any of the above embodiments, and therefore also has the technical effects of any of the above embodiments, which will not be repeated here.

[0129] This application provides an energy storage device, which includes the battery device described in the above embodiments, and the battery device is used to store electrical energy.

[0130] The energy storage device provided in this application includes the battery device described in any of the above embodiments, and therefore also has the technical effects of any of the above embodiments, which will not be repeated here.

[0131] Please refer to Figures 2 to 7According to some embodiments of this application, this application provides a battery device 100, including a housing 10, a battery cell 20, a bottom protective plate assembly 30, and fasteners. The housing 10 has a receiving cavity; the battery cell 20 is housed within the receiving cavity; the bottom protective plate assembly 30 is disposed at the bottom of the housing 10 and includes a first protective member 31, a second protective member 32, and a sealing member 33. The second protective member 32 is disposed on the side of the first protective member 31 away from the receiving cavity and defines a sealed cavity 34 between the two members, the sealed cavity 34 being filled with a heat-resistant gas; the second protective member 32 includes an integrally connected main body plate 321 and an edge plate 322. The main body plate 321 is partially recessed to form a receiving groove 323, the edge plate 322 surrounds the periphery of the sealing groove, and the sealing member 33 is circumferentially disposed between the edge plate 322 and the first protective member 31 to seal the gap between the edge plate 322 and the first protective member 31; the edge plate 322... The housing 22 is provided with a first limiting groove 3221 and a second limiting groove 3222 extending circumferentially along the receiving groove 323. A first protective member 31 has a first protruding rib 311 on the side facing the edge plate 322, which is inserted into the first limiting groove 3221 and presses a portion of the sealing member 33 into the first limiting groove 3221. A second protruding rib 1211 is provided on the side facing the edge plate 322, which is inserted into the second limiting groove 3222 and presses a portion of the second sealing member 33 into the second limiting groove 3222. The housing 10 includes a housing frame 121 and a heat exchange plate 122 located at the bottom of the housing frame 121. The second protective member 32 has a connecting hole, through which fasteners are fixedly connected to the housing frame 121. The technical solution of this application can improve the heat preservation performance of the battery device, thus helping to improve the performance of the battery device.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box-shaped enclosure has a receiving cavity; A single battery cell is housed within the receiving cavity; A bottom protective plate assembly is disposed at the bottom of the housing. The bottom protective plate assembly includes a first protective member and a second protective member stacked along a first direction. The second protective member is located on the side of the first protective member away from the receiving cavity and defines a sealed cavity between the second and the first protective member. The sealed cavity is filled with heat-resistant gas.

2. The battery device according to claim 1, characterized in that, The second protective member includes a main body plate and an edge plate surrounding the periphery of the main body plate. At least a portion of the main body plate is recessed in a direction away from the first protective member to form a receiving groove. The edge plate is sealed to the first protective member so that the sealed cavity is formed between the second protective member and the first protective member.

3. The battery device according to claim 2, characterized in that, The main body plate includes recessed sections and raised sections that are alternately connected in sequence along a second direction, and the first direction and the second direction are intersecting.

4. The battery device according to claim 3, characterized in that, The surface of the raised section and / or recessed section is an arc-shaped curved surface.

5. The battery device according to claim 3, characterized in that, There is a gap between the protruding section and the first protective component; Alternatively, at least one of the protruding sections is sealed to the first protective member to divide the sealed cavity into at least two sub-sealed cavities.

6. The battery device according to any one of claims 2-4, characterized in that, The bottom guard plate assembly also includes a seal, which is circumferentially disposed between the first guard and the edge plate.

7. The battery device according to claim 6, characterized in that, The sealing element includes foam or rubber components.

8. The battery device according to claim 6, characterized in that, The edge plate is provided with a first limiting groove on the side facing the first protective member along the first direction. The first limiting groove extends circumferentially along the receiving groove. The first protective member is provided with a first protruding rib on the side facing the edge plate along the first direction. The position of the first protruding rib corresponds to the position of the first limiting groove. The first protruding rib is inserted into the first limiting groove, and part of the sealing member is pressed into the first limiting groove by the first protruding rib.

9. The battery device according to claim 8, characterized in that, The edge plate is provided with a second limiting groove on the side facing the first protective member along the first direction. The second limiting groove extends circumferentially along the receiving groove and is located on the side of the first limiting groove facing away from the receiving groove along the second direction. The box body is provided with a second protruding rib on the side facing the edge plate along the first direction. The position of the second protruding rib corresponds to the position of the second limiting groove. The second protruding rib is inserted into the second limiting groove, and part of the sealing member is pressed into the second limiting groove by the second protruding rib. The first direction and the second direction are intersecting. Alternatively, the edge plate is provided with a second rib on the side facing the first protective member along the first direction. The second rib extends circumferentially along the receiving groove and is located on the side of the first limiting groove facing away from the receiving groove along the second direction. The box body is provided with a second limiting groove on the side facing the edge plate along the first direction. The position of the second limiting groove corresponds to the position of the second rib. The second rib is inserted into the second limiting groove, and part of the sealing member is pressed into the second limiting groove by the second rib. The first direction and the second direction are intersecting.

10. The battery device according to any one of claims 1-4, characterized in that, The surface of the first protective component and / or the second protective component is coated with a heat-insulating coating.

11. The battery device according to any one of claims 1-4, characterized in that, The housing includes a housing frame and a heat exchange plate. The heat exchange plate is located at the bottom of the housing frame and defines the receiving cavity between the heat exchange plate and the housing frame. The heat exchange plate has a heat exchange channel for circulating heat exchange medium. The bottom guard plate assembly is located on the side of the heat exchange plate away from the receiving cavity along the first direction.

12. The battery device according to claim 11, characterized in that, The battery device also includes fasteners, and the second protective member has a connection hole. The fastener passes through the connection hole and is fixedly connected to the housing frame.

13. The battery device according to any one of claims 1-4, characterized in that, The first protective component and / or the second protective component are provided with an air injection hole, and the air injection hole is equipped with an air injection valve. The air injection hole is used to inject the heat-resistant gas into the sealed cavity.

14. The battery device according to any one of claims 1-4, characterized in that, The heat-resistant gas includes one of xenon, krypton, argon, carbon dioxide, and nitrogen.

15. An electrical appliance, characterized in that, The electrical equipment includes a battery device as described in any one of claims 1-14, the battery device being used to provide electrical energy.

16. An energy storage device, characterized in that, The energy storage device includes a battery device as described in any one of claims 1-14, the battery device being used to store electrical energy.

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