Battery device, electric device, and energy storage device

Abstract

The application provides a battery device, a power consumption device and an energy storage device. The battery device comprises a box assembly and a battery cell group. An accommodating cavity is formed in the box assembly. The battery cell group is located in the accommodating cavity, and comprises a plurality of battery cells arranged along a first direction. At least one air duct for air flow is formed between adjacent battery cells along the first direction, the air duct is in communication with the outside, and a part of the shell wall of each of the adjacent battery cells is configured as an air duct wall opposite to the air duct along the first direction. The battery device provided by the application has good heat exchange performance, and does not need to increase additional heat exchange components, which is beneficial to reducing the weight of the whole battery device while ensuring heat exchange, and saving cost.

Description

Technical Field

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

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, battery-powered electrical devices are already in widespread use. In addition, batteries are increasingly being used in the field of energy storage.

[0003] In battery-powered electrical devices, batteries can provide all or part of the power. In the energy storage field, batteries can be installed in energy storage enclosures or directly on the user side. During the use of battery devices, the individual battery cells generate heat. If this heat is too high, it will adversely affect the performance and lifespan of the battery device. Therefore, how to effectively exchange heat between the battery cells in a battery device is one of the research topics in the industry. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a battery device, an electrical device, and an energy storage device that feature good heat exchange performance, light weight, and high reliability.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides a battery device, including a housing assembly and a battery cell group, wherein a receiving cavity is formed inside the housing assembly; the battery cell group is located inside the receiving cavity, and the battery cell group includes a plurality of battery cells arranged along a first direction; at least one air duct for airflow is formed between adjacent battery cells along the first direction, the air duct is connected to the outside, and a portion of the housing wall of each adjacent battery cell constitutes the air duct wall opposite to the air duct along the first direction.

[0007] In the battery device of this application, a portion of the casing wall of each battery cell can form part of the air duct wall. Thus, when the airflow passes through the air duct, it can directly exchange heat with the casing wall of the battery cell, resulting in better heat exchange effect. Moreover, there is no need to set up additional heat exchange structures in the battery device. The air duct can be formed by the cooperation between the existing structural components of the battery device to achieve cooling or heating of the battery device. This helps to reduce the number of parts and lower production costs. While ensuring good heat exchange effect, it also helps to reduce the overall weight of the battery device and achieve overall lightweighting of the battery device.

[0008] In addition, the battery device of this application uses gas for heat exchange, which is lighter and occupies less space compared to liquid heat exchange. It also eliminates the need for separate liquid cooling units and liquid cooling plates, which helps to further reduce the overall weight of the battery device. Furthermore, it helps to increase the energy density of the battery device without changing the overall volume of the battery device.

[0009] In some embodiments, the battery device includes a spacer assembly located between adjacent battery cells along a first direction; the number of spacer assemblies between adjacent battery cells along the first direction is at least two, and the at least two spacer assemblies are arranged at intervals along a second direction to form at least one gap region, the gap region constituting an air duct; the second direction intersects the first direction.

[0010] Therefore, by arranging the spacer assemblies between adjacent battery cells at intervals along the second direction, the air duct can be formed by utilizing the structure within the battery device itself. There is no need to set up a separate heat exchange component. The structure is simple and ingeniously designed, and it can also reduce the overall weight of the battery device, which is conducive to achieving lightweighting of the battery device.

[0011] In some embodiments, the air duct extends along a third direction; the battery device forms a ventilation cavity that communicates with the air duct, the ventilation cavity includes an air inlet cavity and an air outlet cavity, the air inlet cavity is located on one side of the battery cell group along the third direction, and the air outlet cavity is located on the other side of the battery cell group along the third direction; the housing assembly is provided with an air inlet and an air outlet, the air inlet communicates with the air inlet cavity, and the air outlet communicates with the air outlet cavity; the third direction intersects with both the first direction and the second direction.

[0012] Therefore, the air duct can be connected to the outside through the ventilation cavity, and the heat exchange gas can flow in the air duct through the air inlet, air inlet cavity, air outlet cavity and air outlet to exchange heat with the shell wall of the battery cell, thereby realizing heat exchange with the battery cell, improving the heat exchange effect of the battery cell, and maintaining the temperature of the battery cell within a suitable range.

[0013] In addition, because of the ventilation chamber, there is no need to install additional connecting parts between the various air ducts and the air inlet and outlet, which helps to reduce the overall weight of the battery device and achieve lightweighting.

[0014] In some embodiments, the battery device includes a plurality of battery cell groups, each battery cell group being arranged along a third direction to form a battery cell array, the battery cell array including a battery cell row, the battery cell row including a plurality of battery cells arranged along a third direction; an air duct is located between two adjacent battery cell rows along a first direction; an air inlet is located on one side of the battery cell array along a third direction, and an air outlet is located on the other side of the battery cell array along a third direction.

[0015] Therefore, the heat exchange gas can circulate in the air duct extending in the third direction, thereby exchanging heat with multiple battery cells arranged in the third direction to achieve cooling or heating of the battery cells in the entire battery cell array.

[0016] In some embodiments, the housing assembly includes a side panel assembly, which includes an inner wall facing the interior of the receiving cavity and an outer wall facing the exterior of the receiving cavity. A hollow cavity is formed between the inner wall and the outer wall, which is configured as at least a partial air inlet cavity or at least a partial air outlet cavity. The inner wall of the side panel also has an air vent, and the hollow cavity is connected to each air duct through the air vent.

[0017] A hollow cavity is formed between the inner and outer walls of the side panel. On the one hand, this helps to reduce the overall weight of the housing assembly and achieve lightweighting of the battery device. On the other hand, the hollow cavity can be used to form an air inlet and outlet cavity for heat exchange gas to flow in and out. The heat exchange gas can circulate in the air duct through the air inlet and outlet cavity. This eliminates the need for multiple air inlets, outlets and connecting parts to connect the various air ducts. The heat exchange gas can also circulate in multiple air ducts of the battery cell group through the air inlet and outlet cavity to exchange heat with each battery cell in the battery cell group. The structure is simpler and it is also conducive to further reducing the overall weight of the battery device.

[0018] In some embodiments, the ventilation cavity further includes a collection cavity; a collection cavity is formed between the battery cell group adjacent to the side panel assembly along a third direction and the side panel assembly, the collection cavity is connected to each air duct, and the hollow cavity is connected to the collection cavity through an air outlet.

[0019] Therefore, the air inlet and outlet chambers do not need to have the same number of air vents as the air ducts. The heat exchange gas can also enter each air duct through the collection chamber, which facilitates heat exchange for each battery cell. While ensuring the heat exchange effect, it helps to reduce the manufacturing difficulty of the battery device.

[0020] In some embodiments, the housing assembly includes a first housing and a second housing, which are fastened together to form a receiving cavity; the first housing includes a bottom plate on which a battery cell pack is supported; the second housing includes a top plate located on opposite sides of the bottom plate along a second direction; the side plate assembly includes side plate members disposed opposite each other along the second direction, each side plate member including a first side plate disposed on an air inlet side and a second side plate disposed on an air outlet side, the first side plate having an air inlet cavity formed therein, and the second side plate having an air outlet cavity formed therein; both the first side plate and the second side plate are connected to the bottom plate, and / or both the first side plate and the second side plate are connected to the top plate, or the first side plate and the second side plate are respectively connected to the top plate and the bottom plate.

[0021] Therefore, the air inlet and air outlet can be located in the first housing, the second housing, or both, or separately in the first and second housings, allowing for flexible arrangement based on the actual air inlet and outlet conditions, thus offering greater flexibility.

[0022] In some embodiments, the air inlet is disposed on the top plate and / or the bottom plate; and / or the air outlet is disposed on the top plate and / or the bottom plate; in a projection plane perpendicular to the second direction, the projection of the air inlet falls into the projection range of the air inlet cavity, and the projection of the air outlet falls into the projection range of the air outlet cavity.

[0023] Thus, the heat exchange gas can flow into the air inlet cavity through the air inlet provided on the top plate and / or bottom plate, and flow out of the air outlet cavity through the air outlet provided on the top plate and / or bottom plate, thereby realizing the circulation of heat exchange gas in the air duct and heat exchange with the battery cells.

[0024] In some embodiments, there are multiple air vents, which are spaced apart along a first direction; the number of air vents is the same as the number of multiple air ducts arranged along the first direction and corresponds one-to-one.

[0025] This helps to optimize the distribution of heat exchange gas, improve the uniformity of heat exchange gas distribution, and enable the heat exchange gas to flow more evenly through each air duct of the battery cell group, thereby improving the heat exchange effect.

[0026] In some embodiments, along the first direction, the opening area of ​​the air vent is larger the further away from the air inlet.

[0027] This can compensate for the loss of airflow pressure, making the gas flow through each air outlet roughly the same, which helps to further improve the uniformity of heat exchange, making the distribution of heat exchange gas in multiple air ducts more uniform, thereby improving the overall heat exchange effect of the battery device.

[0028] In some embodiments, the thickness of the side panel assembly along a third direction is in the range of 10 mm to 20 mm.

[0029] The thickness of the side panel assembly is within a suitable range, which allows the side panel assembly to have sufficient thickness to open the hollow cavity, and also ensures that the overall thickness of the housing assembly is not too thick, thereby facilitating the miniaturization and weight reduction of the battery device as a whole.

[0030] In some embodiments, the battery device further includes a seal that is frame-shaped and abuts between the battery cell pack and the side panel assembly adjacent to the side panel assembly in a third direction.

[0031] This improves the sealing performance of the collector cavity, making it less likely for the heat exchange gas to escape from the collector cavity to other parts of the battery device. This allows for better control of the flow rate and direction of the heat exchange gas, enabling it to circulate as much as possible within the duct, thereby improving heat exchange efficiency.

[0032] In some embodiments, the housing assembly includes a side panel assembly surrounding the battery cell group, and a ventilation cavity is formed between the battery cell group adjacent to the side panel assembly in a third direction and the side panel assembly.

[0033] Therefore, the ventilation cavity is formed inside the housing cavity of the box assembly, and the air duct of the battery cell group can be directly connected to the outside through the ventilation cavity. The structure is simple and the heat exchange effect is good.

[0034] In some embodiments, the gasket assembly includes a heat insulation member and a frame member surrounding the heat insulation member, the two ends of the frame member along a first direction respectively abutting against the respective housing walls of adjacent battery cells.

[0035] Therefore, the frame component provides additional structural support for the gasket assembly, reducing the likelihood of displacement or deformation when the battery cell expands or is subjected to external impact, thus maintaining the integrity and functionality of the gasket assembly. Furthermore, encapsulating the thermal insulation component within the frame component facilitates the overall installation and maintenance of the gasket assembly, making it easier to fix and separate the gasket assembly from the battery cell.

[0036] In some embodiments, the frame member is configured as an elastic member whose thickness along the first direction can vary with the expansion of the battery cell.

[0037] Therefore, the frame components can absorb the expansion of individual battery cells, thereby reducing the degree of expansion of individual battery cells, reducing the risks caused by expansion, and helping to improve the cycle life of the battery device.

[0038] In some embodiments, the frame component comprises a silicone-based material or a foamed polypropylene-based material.

[0039] Silicone-based materials and foamed polypropylene-based materials possess excellent high-temperature resistance, enabling the frame components to provide effective encapsulation and support even in high-temperature environments. They also exhibit good insulation and flame-retardant properties. Furthermore, the low density and light weight of these two materials contribute to reducing the overall weight of the battery device, facilitating lightweight design.

[0040] In some embodiments, the thermal insulation component includes at least one of aerogel thermal insulation materials, foamed thermal insulation materials, and ceramic thermal insulation materials.

[0041] The aforementioned materials have excellent thermal insulation properties, which can effectively reduce the heat diffusion between battery cells and / or between battery cells and other surrounding components, reduce the possibility of thermal runaway, and improve the overall reliability of the battery device.

[0042] In some embodiments, the material of the thermal insulation component includes at least one of ceramic fiber, glass fiber, aerogel, pre-oxidized fiber, organic foam, silica, and alumina fiber.

[0043] In some embodiments, the thermal conductivity of the insulation element is in the range of 0.03 W / (m·K) to 0.1 W / (m·K).

[0044] Therefore, the heat insulation component has good heat insulation properties and can more effectively block heat transfer between battery cells and / or between battery cells and other surrounding components.

[0045] In some embodiments, the gasket assembly further includes an encapsulation for encapsulating the thermal insulation within the frame member; the encapsulation includes a polyimide material or a high-temperature resistant polyester material.

[0046] Therefore, the encapsulation component provides excellent insulation and encapsulation for the thermal insulation component, reducing the likelihood of it being affected by the external environment and extending its service life. Furthermore, polyimide or high-temperature resistant polyester materials possess excellent physical, chemical, and dimensional properties, as well as superior mechanical properties and heat resistance, making them less prone to damage in high-temperature environments. This contributes to improving the overall reliability of the gasket assembly, thereby better insulating and buffering the individual battery cells.

[0047] In some embodiments, the battery cell includes a first housing wall facing away from each other along a first direction, the first housing wall being the housing wall with the largest area in the battery cell; the gasket assembly is in contact with the first housing wall.

[0048] Therefore, the gasket assembly contacts the first housing wall to insulate the large surface of the battery cell, and part of the first housing wall forms the air duct wall, allowing the heat exchange gas to flow between the housing walls with the largest area of ​​the battery cell, thereby better conducting the heat of the battery cell or better conducting heat to the battery cell, further improving the heat conduction efficiency of the battery cell.

[0049] In some embodiments, the housing assembly includes a stacked insulating structure layer and a fiber composite material layer, wherein the insulating structure layer is located between the fiber composite material layer and the battery cell along a second direction; the second direction intersects with the first direction.

[0050] The fiber composite layer provides excellent structural strength, while the insulating layer not only supports the individual battery cells but also electrically isolates them from the external environment, reducing external interference. The combination of the insulating and fiber composite layers allows the enclosure assembly to balance structural strength and protective performance. Furthermore, the lightweight nature of the fiber composite material contributes to the overall weight reduction of the enclosure assembly.

[0051] In some embodiments, the housing assembly includes a base plate and a side plate assembly, the battery cell pack is supported on the base plate, and the side plate assembly includes two side plate members disposed on opposite sides of the base plate along a second direction, at least a partial insulating structural layer forms the inner wall of the side plate member facing the interior of the receiving cavity, and a fiber composite material layer forms the outer wall of the side plate member facing the exterior of the receiving cavity.

[0052] This ensures both the protective effect and facilitates the connection between the insulation layer and the fiber composite layer.

[0053] In some embodiments, the side panel assembly further includes two beam members connected to opposite sides of the base plate along a first direction, with adjacent beam members connected to the side panel members.

[0054] Therefore, the beam member can constrain the battery cell group in the first direction to withstand the expansion force of the battery cells.

[0055] In some embodiments, the side panel assembly is configured to have a hollow cavity located between the insulating structural layer and the fiber composite material layer of the side panel assembly, and at least a portion of the hollow cavity is configured as an air inlet cavity or an air outlet cavity.

[0056] The hollow cavity design helps reduce the overall weight of the side panel assembly, thus contributing to the lightweighting of the housing assembly. Additionally, the hollow cavity can serve as a heat insulation layer, improving the thermal management capabilities of the battery device. Furthermore, at least a portion of the hollow cavity can be configured as an air inlet and outlet cavity, further enhancing the thermal management capabilities of the battery device.

[0057] In some embodiments, the side panel assembly further includes a support structure located in the hollow cavity and abutting against at least one of the insulating structural layer and the fiber composite material layer of the side panel assembly.

[0058] Therefore, the supporting structure can provide support for the insulation layer and fiber composite layer, thereby improving their resistance to deformation. In addition, the supporting structure can also disperse impacts, enhancing the structural stability of the enclosure assembly.

[0059] In some embodiments, the housing assembly includes a first housing and a second housing that are sealed together, and the first housing and the second housing are snapped together to form a receiving cavity.

[0060] This is beneficial for the overall sealing of the enclosure components and for isolating the battery cells inside the cavity from the external environment.

[0061] A second aspect of this application provides an electrical device including a battery device as described in the first aspect of this application for providing electrical energy.

[0062] The electrical device provided in this application embodiment, by employing the battery device described above, helps to improve the heat exchange efficiency of the electrical device, enabling the battery device to better provide or store electrical energy to the electrical device. Furthermore, the risk of the electrical device failing due to battery device malfunction is reduced, maintenance time is decreased, and reliability is higher. In addition, it also contributes to achieving a lighter overall design for the electrical device.

[0063] In some embodiments, the electrical device includes an aircraft.

[0064] A third aspect of this application provides an energy storage device, including a battery device as described in the first aspect of this application for storing or providing electrical energy.

[0065] The energy storage device provided in this application embodiment, by employing the battery device described above, helps to improve the heat exchange efficiency of the energy storage device, enabling the battery device to better provide or store electrical energy to the energy storage device. Furthermore, the risk of failure due to battery device malfunction is reduced, decreasing maintenance time and increasing reliability. Additionally, it contributes to the overall lightweight design of the energy storage device.

[0066] Utility Model Effect

[0067] This application provides a battery device, power supply device, and energy storage device that have good heat exchange performance, are lightweight, and have high reliability. Attached Figure Description

[0068] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0069] Figure 1 Structural schematic diagrams of vehicles provided for some embodiments of this application;

[0070] Figure 2 Schematic diagrams of the structure of the aircraft provided for some embodiments of this application;

[0071] Figure 3 Schematic diagram of the exploded structure of a battery device provided for some embodiments of this application Figure 1 ;

[0072] Figure 4 Schematic diagram of the exploded structure of a battery device provided for some embodiments of this application Figure 2 ;

[0073] Figure 5 A perspective structural schematic diagram of the first housing of a battery device provided for some embodiments of this application;

[0074] Figure 6 Top view of a battery device provided for some embodiments of this application;

[0075] Figure 7 for Figure 6 AA section view;

[0076] Figure 8 for Figure 6 BB cross-sectional view;

[0077] Figure 9 for Figure 6 CC section view;

[0078] Figure 10 A partial schematic cross-sectional view of a battery cell assembly provided for some embodiments of this application, showing the battery cell, gasket assembly, and air duct;

[0079] Figure 11 Bottom view of a battery device provided for some embodiments of this application;

[0080] Figure 12 A three-dimensional structural schematic diagram of the seal provided for some embodiments of this application;

[0081] Figure 13 A three-dimensional structural schematic diagram of a gasket assembly provided for some embodiments of this application.

[0082] Explanation of reference numerals in the attached figures

[0083] 1. Housing assembly; 11. First housing; 111. Bottom plate; 12. Second housing; 121. Top plate; 13. Air inlet; 14. Air outlet; 15. Side panel assembly; 15a. Side panel component; 15b. Beam component; 151. Inner wall of side panel; 152. Outer wall of side panel; 153. Air vent; 154. First side panel; 155. Second side panel; 2. Battery cell assembly; 21. Battery cell; 22. Housing wall; 22 1. First housing wall; 3. Gasket assembly; 31. Thermal insulation; 32. Frame; 4. Sealing; 41. First section; 42. Second section; 10. Receiving cavity; 20. Air duct; 30. Ventilation cavity; 301. Air inlet cavity; 302. Air outlet cavity; 303. Collector cavity; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle; 2000. Aircraft; 2100. Cabin shell. Detailed Implementation

[0084] 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.

[0085] 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.

[0086] In the description of the embodiments of this application, the technical terms "first," "second," "third," "fourth," "fifth," etc., 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.

[0087] 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.

[0088] 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 are in an "or" relationship.

[0089] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., 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 do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0090] 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0091] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0092] The following is a detailed description of this application.

[0093] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as aircraft. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0094] The temperature inside a battery pack is affected by the external environment. The individual battery cells within the pack need to operate within a certain normal temperature range. If the temperature of a battery cell exceeds or falls below this range, it will significantly impact the performance and lifespan of the battery pack. For example, in hot weather, the battery pack needs to cool the individual cells to maintain the required temperature within the pack; in cold weather, the battery cells need to be heated to keep the internal temperature within a suitable range.

[0095] In related technologies, heat exchange components such as liquid cooling plates and air cooling plates are typically placed between adjacent battery cells to dissipate heat or increase the temperature of the battery cells, thereby enabling the battery cells to operate within a normal temperature range. However, heat exchange components usually have a certain thickness and internal channels for the flow of the heat exchange medium. Therefore, heat exchange components occupy a large space within the battery device, and the weight of liquid heat exchange media is relatively heavy, which is detrimental to achieving lightweight battery devices and improving the energy density of the battery device.

[0096] Especially for battery devices used in aerospace and other fields, the unique application environment places higher demands on the weight, reliability and energy density of the battery devices.

[0097] This application addresses the problems existing in the aforementioned related technologies by proposing a battery device. The battery device includes a housing assembly and a battery cell group, with a receiving cavity formed inside the housing assembly. The battery cell group is located within the receiving cavity and includes a plurality of battery cells arranged along a first direction. At least one air duct for airflow is formed between adjacent battery cells along the first direction, and the air duct communicates with the outside. A portion of the casing wall of each adjacent battery cell constitutes the air duct wall opposite to the air duct along the first direction.

[0098] In the battery device of this application, a portion of the casing wall of each battery cell can form part of the air duct wall. As a result, when the airflow passes through the air duct, it can directly exchange heat with the casing wall of the battery cell, resulting in better heat exchange effect. Moreover, there is no need to set up additional heat exchange structures in the battery device. The air duct can be formed by the cooperation between the existing structural components of the battery device to achieve cooling or heating of the battery device. This helps to reduce the number of parts and lower production costs. While ensuring good heat exchange effect, it also helps to reduce the overall weight of the battery device and achieve overall lightweighting of the battery device.

[0099] In addition, the battery device of this application uses gas for heat exchange, which is lighter and occupies less space compared to liquid heat exchange. It also eliminates the need for separate liquid cooling units and liquid cooling plates, which helps to further reduce the overall weight of the battery device. Furthermore, it helps to increase the energy density of the battery device without changing the overall volume of the battery device.

[0100] The battery apparatus provided in this application embodiment can be used, but is not limited to, in energy storage power systems, vehicles, ships or aircraft and other electrical devices, as well as in energy storage containers, energy storage cabinets and other energy storage devices.

[0101] This application provides an electrical device that includes the aforementioned battery device for providing electrical energy. The electrical device includes, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. 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.

[0102] For ease of explanation, the description will be exemplified by taking a vehicle 1000 as an example of an embodiment of the present application.

[0103] Figure 1 The diagram illustrates the structure of a vehicle 1000 as 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. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. 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.

[0104] 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.

[0105] As an example, an aircraft 2000 is used as an example of an electrical device in one embodiment of this application for explanation.

[0106] Figure 2The diagram shows the structure of an aircraft 2000 provided for some embodiments of this application. An aircraft generally refers to a device that flies within or outside the atmosphere (space), and may include aircraft that fly within the atmosphere and spacecraft that fly in space.

[0107] Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc.

[0108] Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0109] Reference Figure 2 The aircraft 2000 typically includes an airframe (including a cabin shell 2100) and a battery device 100 (including a housing assembly 1) disposed on the airframe and providing electrical power to the airframe.

[0110] Below, refer to Figures 3 to 12 Some embodiments of this application will be described in detail.

[0111] Figure 3 Schematic diagram of the exploded structure of a battery device provided for some embodiments of this application Figure 1 ; Figure 4 Schematic diagram of the exploded structure of a battery device provided for some embodiments of this application Figure 2 ; Figure 5 A perspective structural schematic diagram of the first housing of a battery device provided for some embodiments of this application; Figure 6 Top view of a battery device provided for some embodiments of this application; Figure 7 for Figure 6 AA section view; Figure 8 for Figure 6 BB cross-sectional view; Figure 9 for Figure 6 CC section view; Figure 10 A partial schematic cross-sectional view of a battery cell assembly provided for some embodiments of this application, showing the battery cell, gasket assembly, and air duct; Figure 11 Bottom view of a battery device provided for some embodiments of this application; Figure 12 A three-dimensional structural schematic diagram of the seal provided for some embodiments of this application; Figure 13 A three-dimensional structural schematic diagram of a gasket assembly provided for some embodiments of this application.

[0112] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined, which are perpendicular to each other. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions are perpendicular to each other. For ease of explanation, as... Figures 3 to 11 As shown by the arrows in the diagram, the direction of arrow X is the first direction, the direction of arrow Y is the second direction, and the direction of arrow Z is the third direction.

[0113] The first aspect of this application provides a battery device 100, such as Figure 3 and Figure 4 As shown, the battery device 100 includes a housing assembly 1 and a battery cell group 2. A receiving cavity 10 is formed inside the housing assembly 1. The battery cell group 2 is located within the receiving cavity 10 and includes a plurality of battery cells 21 arranged along a first direction. At least one air duct 20 for airflow is formed between adjacent battery cells 21 along the first direction. The air duct 20 communicates with the outside, and a portion of the casing wall of each adjacent battery cell 21 constitutes an opposing air duct wall of the air duct 20 along the first direction.

[0114] The battery device 100 is used to provide voltage and capacity.

[0115] The battery cell 21 can be a secondary battery. A secondary battery is a battery cell 21 that can be recharged to activate the active materials and continue to be used after it has been discharged.

[0116] The battery cell 21 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 the embodiments of this application are not limited to this.

[0117] The battery cell 21 includes an electrode assembly, which is the component in the battery cell 21 where electrochemical reactions occur. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which are typically stacked along the thickness direction (first direction) of the battery cell 21. During the charging and discharging process of the battery cell 21, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode. The separator is disposed between the positive and negative electrode to prevent short circuits between the positive and negative electrode while allowing active ions to pass through.

[0118] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0119] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0120] In some implementations, the electrode assembly is a stacked structure.

[0121] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0122] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0123] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0124] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0125] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0126] In some embodiments, the battery cell 21 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0127] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0128] In some embodiments, the battery cell 21 may include a housing, which includes a plurality of housing walls 22. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0129] In the battery device 100, there can be multiple battery cells 21. These multiple battery cells 21 can be connected in series, in parallel, or in a mixed manner to form a battery cell group 2 (multiple battery cells 21 arranged along a first direction), a battery cell row (multiple battery cells 21 arranged along a third direction), or a battery cell array (multiple battery cell groups 2 arranged along a third direction). A mixed connection means that multiple battery cells 21 are connected in both series and parallel.

[0130] The battery device 100 may also include other structures, such as a busbar for electrical connection between multiple battery cells 21 or multiple battery cell groups 2.

[0131] The housing assembly 1 is the external protective shell of the battery device 100, used to house various functional components that enable the battery device 100 to function. An accommodating cavity 10 is formed inside the housing assembly 1, within which the battery cell group 2 is housed. The housing assembly 1 provides a certain degree of protection for the battery cell group 2, thereby reducing the possibility of damage to individual battery cells 21 due to mechanical impact or thermal runaway.

[0132] For example, the battery cell pack 2 can be mounted to the electrical device via the housing assembly 1.

[0133] The box assembly 1 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0134] For example, the housing assembly 1 is typically a cuboid structure. Both the length and width directions of the housing assembly 1 are parallel to the horizontal plane, and the length direction of the housing assembly 1 is parallel to the longest side of its cuboid structure. The height direction of the housing assembly is perpendicular to the ground. For example, as... Figure 3 and Figure 4 As shown, the length direction of the housing assembly 1 is the first direction, and the width direction of the housing assembly 1 is the third direction; or the length direction of the housing assembly 1 is the third direction, and the width direction of the housing assembly 1 is the first direction. The height direction of the housing assembly 1 is the second direction.

[0135] like Figure 3 As shown, an air duct 20 is formed between adjacent battery cells 21 along the first direction. The air duct 20 is connected to the outside, and the airflow from the outside can flow through the air duct 20 between adjacent battery cells 21, thereby realizing heat exchange between the battery cells 21 inside the housing assembly 1 and the outside, so as to cool or heat the battery cells 21.

[0136] For example, the air duct 20 can communicate with the outside gas through the air inlet and air outlet provided on the housing assembly 1.

[0137] This application does not specifically limit the formation method of the air duct 20.

[0138] For example, a seal may be provided between adjacent battery cells 21 along the first direction so that an air duct 20 is formed between adjacent battery cells 21.

[0139] As another example, a structural component with a high thermal conductivity can be provided between adjacent battery cells 21 along the first direction so that an air duct 20 is formed between adjacent battery cells 21.

[0140] As another example, adjacent battery cells 21 along the first direction can be separated by existing structural members within the battery device 100, so that an air duct 20 is formed between adjacent battery cells 21.

[0141] This application embodiment does not specifically limit the number of air ducts 20 between adjacent battery cells 21. For example, there may be only one air duct 20 between adjacent battery cells 21 along the first direction, or there may be two, three or more air ducts 20.

[0142] In this embodiment, a portion of the casing wall 22 of each battery cell 21 in the battery device 100 can be configured as part of the air duct wall of the air duct 20. Thus, when the airflow passes through the air duct 20, it can directly exchange heat with the casing wall 22 of the battery cell 21, resulting in better heat exchange. Moreover, there is no need to install additional heat exchange structures such as liquid cooling plates or air cooling plates inside the battery device 100. The air duct 20 can be formed by the cooperation between the existing structural components inside the battery device 100, so as to achieve cooling or heating of the battery device 100. This helps to reduce the number of parts and reduce production costs. While ensuring good heat exchange effect, it also helps to reduce the overall weight of the battery device 100, thus achieving overall lightweighting of the battery device 100.

[0143] In addition, the battery device 100 of this application uses gas for heat exchange, which is lighter and occupies less space compared to liquid heat exchange. It also eliminates the need for a separate liquid cooling unit, which helps to further reduce the overall weight of the battery device 100. Furthermore, it helps to increase the energy density of the battery device 100 while keeping the overall volume of the battery device 100 unchanged.

[0144] In some embodiments of this application, such as Figure 2 , Figure 3 and Figure 10 As shown, the battery device 100 includes a spacer assembly 3 located between adjacent battery cells 21 along a first direction. The number of spacer assemblies 3 between adjacent battery cells 21 along the first direction is at least two, and these at least two spacer assemblies 3 are arranged at intervals along a second direction to form at least one gap region, which constitutes an air duct 20. The second direction intersects the first direction.

[0145] The gasket assembly 3 may be a functional gasket assembly for example, used for thermal management of the battery cell 21 or to reduce the expansion of the battery cell 21.

[0146] For example, the gasket assembly 3 may include a thermal insulation element with a low thermal conductivity.

[0147] As another example, the gasket assembly 3 may include a cushioning element.

[0148] As another example, the gasket assembly 3 may include a thermally conductive element with a high thermal conductivity.

[0149] The gasket assembly 3 can be a simple single-layer structure, a multi-layer stacked structure, or a complex composite structure. The embodiments of this application do not limit the specific structure of the gasket assembly 3, and can be set according to the actual situation.

[0150] In this embodiment, the gasket assembly 3 extends along a third direction and is generally flat. At least a portion of the cross-sectional shape of the gasket assembly 3 is substantially the same as the shape of the housing wall 22 of the battery cell 21, thereby enabling better contact with the housing wall 22 of the battery cell 21 and realizing its function.

[0151] like Figure 10 As shown in the embodiment of this application, there are multiple spacer assemblies 3 between adjacent battery cells 21 along the first direction, and the multiple spacer assemblies 3 are arranged at intervals along the second direction. Thus, a certain interval area is formed between adjacent spacer assemblies 3 along the second direction, and the interval area constitutes the air duct 20.

[0152] Therefore, by arranging the gasket assembly 3 between adjacent battery cells 21 at intervals along the second direction, the air duct 20 can be formed by the structural components within the battery device 100 itself, without the need for a separate heat exchange assembly. The structure is simple and the design is ingenious, which can also reduce the overall weight of the battery device 100, thus helping to achieve lightweighting of the battery device 100.

[0153] This application does not specifically limit the number of spacer assemblies 3 between adjacent battery cells 21 along the first direction; the number can be set according to the actual needs of the air ducts 20. In the battery cell group 2, the number of spacer assemblies 3 between each adjacent battery cell 21 along the first direction can be the same or different.

[0154] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, the air duct 20 extends along a third direction. The battery device 100 forms a ventilation cavity 30, which communicates with the air duct 20. The ventilation cavity 30 includes an air inlet cavity 301 and an air outlet cavity 302. The air inlet cavity 301 is located on one side of the battery cell group 2 along the third direction, and the air outlet cavity 302 is located on the other side of the battery cell group 2 along the third direction. The housing assembly 1 is provided with an air inlet 13 and an air outlet 14. The air inlet 13 communicates with the air inlet cavity 301, and the air outlet 14 communicates with the air outlet cavity 302. The third direction intersects with both the first and second directions.

[0155] Thus, the air duct 20 can be connected to the outside through the ventilation cavity 30. Figure 7 and Figure 8The dashed lines in the diagram schematically indicate the direction of gas flow. The heat exchange medium enters the air inlet chamber 301 through the air inlet 13, and then enters the air duct 20 through the air inlet chamber 301. After flowing through the air duct 20, the heat exchange medium enters the air outlet chamber 302, and then flows out to the outside through the air outlet 14. This allows the heat exchange medium to flow within the air duct 20 and exchange heat with the casing wall 22 of the battery cell 21, thereby achieving heat exchange with the battery cell 21, improving the heat exchange effect of the battery cell 21, and maintaining the temperature of the battery cell 21 within a suitable range.

[0156] In addition, since the ventilation cavity 30 is provided, there is no need to provide additional connecting parts for connecting each air duct 20 or connecting the ventilation duct 20 with the air inlet 13 and the air outlet 14 inside the battery device 100. The structure is simpler, which helps to reduce the overall weight of the battery device 100 and achieve the lightweighting of the battery device 100.

[0157] Since the battery cell group 2 has multiple battery cells 21 arranged along the first direction, multiple air ducts 20 are formed within the battery cell group 2 along the first direction. That is, air ducts 20 are formed between each adjacent battery cell 21 along the first direction. The ventilation cavity 30 can connect the multiple air ducts 20 along the first direction. Therefore, it is not necessary to set multiple air inlets 13 and multiple air outlets 14, and each air duct 20 can be connected to the outside through the ventilation cavity 30, thereby enabling good heat exchange for each battery cell 21. Alternatively, when the battery device 100 only has With a small number of air inlets 13 or a small number of air outlets 14, each air duct 20 within the battery device 100 can be connected to the air inlets 13 and air outlets 14 through the ventilation cavity 30. This eliminates the need for connecting pipes or other connecting components between the air ducts 20 and the air inlets 13 and air outlets 14, thereby helping to reduce the overall weight of the battery device 100 and achieve better weight reduction. With the overall volume of the housing assembly 1 remaining unchanged, more battery cells 21 can be placed inside the housing assembly 1, which is beneficial to improving the energy density of the battery device 100.

[0158] Of course, those skilled in the art should understand that in some other embodiments, the battery device 100 may not have a ventilation cavity 30, and the housing assembly 1 may have an air inlet 13 and an air outlet 14 corresponding to each air duct 20, or multiple air ducts 20 may be connected to each other through a harmonica tube or other connecting member and connected together to the air inlet 13 or the air outlet 14.

[0159] In this embodiment, the ventilation cavity 30 can be formed in the receiving cavity 10 of the housing assembly 1 or in the housing wall of the housing assembly 1. This embodiment does not specifically limit the formation location of the ventilation cavity 30, as long as each air duct 20 can be connected to each other through the ventilation cavity 30 and connected to the air inlet 13 and the air outlet 14.

[0160] For example, the air inlet 13 and the air outlet 14 can be connected to an air conditioning system, an air-cooling system, a fan device, etc.

[0161] As another example, the air inlet 13 and the air outlet 14 can be directly connected to the outside of the electrical device, for example, the electrical device is the aircraft 2000, and the heat exchange medium is the airflow generated during the flight of the aircraft 2000. The airflow generated during the flight of the aircraft 2000 is used to cool the battery cell 21. The airflow has a high velocity, which facilitates the cooling of the battery cell 21 and simplifies the heat exchange structure. There is no need to set up an additional cooling and heat exchange mechanism, which helps to achieve the lightweighting of the aircraft.

[0162] For example, the aircraft 2000 can also direct natural air through the air inlet 13 to the ventilation cavity 30 via the air diversion duct in the cabin.

[0163] Here, because the aircraft 2000 has strong convection characteristics during flight, it is beneficial to further improve the heat exchange effect on the battery cell 21.

[0164] Of course, in embodiments where the electrical device is a vehicle 1000 or the like, the battery cell 21 can also be cooled by natural wind.

[0165] For example, the air inlet 13 and the air outlet 14 may have the same or different structures, the air inlet 13 and the air outlet 14 may have the same or different sizes, the number of air inlets 13 and the air outlet 14 may be the same or different, and the air inlets 13 and the air outlet 14 may be set on the same structural component or on different structural components.

[0166] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the battery device 100 includes multiple battery cell groups 2, each battery cell group 2 arranged along a third direction to form a battery cell array. The battery cell array 21 includes battery cell rows, and each battery cell row includes multiple battery cells 21 arranged along a third direction. The air duct 20 is located between two adjacent battery cell rows along the first direction. The air inlet 301 is located on one side of the battery cell array along the third direction, and the air outlet 302 is located on the other side of the battery cell array along the third direction.

[0167] Thus, the heat exchange gas can circulate within the air duct 20 extending in the third direction, thereby exchanging heat with the multiple battery cells 21 arranged in the third direction to achieve cooling or heating of the battery cells 21 of the entire battery cell array.

[0168] In some embodiments of this application, such as Figure 5 As shown, the housing assembly 1 includes a side panel assembly 15, which includes an inner wall 151 facing the interior of the receiving cavity 10 and an outer wall 152 facing the exterior of the receiving cavity 10. A hollow cavity is formed between the inner wall 151 and the outer wall 152, which is configured as at least a partial air inlet cavity 301 or at least a partial air outlet cavity 302. The inner wall 151 also has an air passage 153, and the hollow cavity is connected to each air duct 20 through the air passage 153.

[0169] In this application, a hollow cavity is formed in the side panel assembly 15, and part of the hollow cavity constitutes the air inlet cavity 301 and the air outlet cavity 302 of the ventilation cavity 30. The air outlet 153 is formed on the inner wall 151 of the side panel, thereby connecting the air inlet cavity 301 and the air duct 20, as well as the air outlet cavity 302 and the air duct 20.

[0170] Figure 7 The dashed lines in the figure schematically show the direction of airflow. The airflow from the outside enters the air inlet cavity 301 through the air inlet 13, and then flows into the receiving cavity 10 through the air outlet 153 on the air inlet side. Although the air outlet cavity 302 is not shown in the figure, the airflow flowing through the air duct 20 flows into the air outlet cavity 302 through the air outlet 153 on the air outlet side, and then flows out to the outside through the air outlet 14.

[0171] For example, the number of air vents 153 can be one, and an air vent 153 can be an elongated oval extending along a first direction.

[0172] As another example, the number of air vents 153 can be multiple, and the multiple air vents 153 are arranged at intervals along the first direction.

[0173] This application does not impose a specific limitation on the number of air vents 153, nor does it impose a specific limitation on the shape of the air vents 153. When there are multiple air vents 153, the number of air vents 153 on the air inlet side and the air outlet side can be the same or different, and the shape of each air vent 153 can be the same or different.

[0174] A hollow cavity is formed between the inner wall 151 and the outer wall 152 of the side panel. On the one hand, this helps to reduce the overall weight of the housing assembly 1 and achieve lightweighting of the battery device 100. On the other hand, the hollow cavity can be used to form an air inlet cavity 301 and an air outlet cavity 302 for the inflow and outflow of heat exchange gas. The heat exchange gas can circulate in the air duct 20 through the air inlet cavity 301 and the air outlet cavity 302. This eliminates the need for multiple air inlets 13, air outlets 14 and connecting parts connecting each air duct 20. The heat exchange gas can also circulate in multiple air ducts 20 of the battery cell group 2 through the air inlet cavity 301 and the air outlet cavity 302 to exchange heat with each battery cell 21 in the battery cell group 2. The structure is simpler and it is also helpful to further reduce the overall weight of the battery device 100.

[0175] In some embodiments of this application, the ventilation cavity 30 further includes a flow collection cavity 303. A flow collection cavity 303 is formed between the battery cell group 2 adjacent to the side panel assembly 15 along a third direction and the side panel assembly 15. The flow collection cavity 303 is connected to each air duct 20, and the hollow cavity is connected to the flow collection cavity 303 through the air outlet 153.

[0176] In this embodiment, there are two current collection cavities 303, which are respectively located on opposite sides of the receiving cavity 10 along a third direction. Specifically, the battery cell group 2 or battery cell array are arranged at intervals with the inner wall 151 of the side plate of the housing assembly 1 along a third direction to form a certain gap space, which constitutes the current collection cavity 303.

[0177] Thus, the external heat exchange gas first flows into the air inlet cavity 301 through the air inlet 13, then into the air inlet side collection cavity 303 through the air outlet 153, and then into each air duct 20. The heat exchange gas flows out through the air duct to the air outlet collection cavity 303, and then into the air outlet cavity 302 through the air outlet 153. Finally, it flows out to the outside through the air outlet 14, realizing the circulation of the heat exchange gas and exchanging heat with the battery cell 21, thereby maintaining the temperature of the battery cell 21 within the normal operating range.

[0178] Those skilled in the art should understand that in some other embodiments, the collecting cavity 303 may be provided only on the air inlet side, or only on the air outlet side, or no collecting cavity 303 may be provided. Of course, when the battery device 100 does not have a collecting cavity 303, the number of air passages 153 connecting the air inlet cavity 301 and the air passages 153 connecting the air outlet cavity 302 should be multiple, and the multiple air passages should correspond to the positions of the air duct 20.

[0179] By setting up the collection cavity 303, along the first direction, the air inlet cavity 301 and the air outlet cavity 302 do not need to be equipped with the same number of air outlets 153 as the air ducts 20. The heat exchange gas can also enter each air duct 20 through the collection cavity 303, which facilitates heat exchange for each battery cell 21. While ensuring the heat exchange effect, it helps to reduce the manufacturing difficulty of the battery device 100.

[0180] In some embodiments of this application, such as Figures 3 to 6 and Figure 11 As shown, the housing assembly 1 includes a first housing 11 and a second housing 12, which are fastened together to form a receiving cavity 10. The first housing 11 includes a bottom plate 111, on which the battery cell pack 2 is supported. The second housing 12 includes a top plate 121, which is located on the opposite side of the bottom plate 111 along a second direction. The side panel assembly 15 includes side panel members 15a disposed opposite each other along the second direction. The side panel members 15a include a first side panel 154 disposed on the air inlet side and a second side panel 155 disposed on the air outlet side. An air inlet cavity 301 is formed in the first side panel 154, and an air outlet cavity 302 is formed in the second side panel 155. The first side plate 154 and the second side plate 155 are both connected to the bottom plate 111, and / or the first side plate 154 and the second side plate 155 are both connected to the top plate 121, or the first side plate 154 and the second side plate 155 are respectively connected to the top plate 121 and the bottom plate 111.

[0181] The first box 11 and the second box 12 are fastened together to form a closed receiving cavity 10. Here, "closed" means to cover or shut, which can be sealed or unsealed.

[0182] In some embodiments of this application, the housing assembly 1 includes a first housing 11 and a second housing 12 that are sealed together, and the first housing 11 and the second housing 12 are fastened together to form a receiving cavity 10.

[0183] This is beneficial for sealing the entire housing assembly 1 and for isolating the battery cell group 2 inside the housing cavity 10 from the external environment.

[0184] In this embodiment of the application, the first box 11 includes a bottom plate 111, which is equivalent to the base of the box assembly 1 (also referred to as the lower box). The second box 12 includes a top plate 121, which is equivalent to the top cover of the box assembly 1 (also referred to as the upper box). In some other embodiments, the first box 11 may include a top plate as the upper box, and the second box 12 may include a bottom plate as the lower box.

[0185] In some embodiments, the housing assembly 1 may be part of the chassis structure of the vehicle 1000. For example, a portion of the first housing 11 of the housing assembly 1 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing assembly 1 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0186] Those skilled in the art should understand that this application only schematically refers to the side panel member 15a with the air inlet cavity 301 as the first side panel 154, and the side panel member 15a with the air outlet cavity 302 as the second side panel 155. The side panel member 15a does not only include the first side panel 154 and the second side panel 155. For example, in some embodiments, the side panel member 15a may also include a third side panel with a hollow cavity, the hollow cavity of which does not constitute the air inlet cavity 301 or the air outlet cavity 302. Alternatively, the side panel member 15a may also include a fourth side panel without a hollow cavity, i.e., the fourth side panel is a solid structure. The side panel member 15a of the housing assembly 1 may simultaneously include the first side panel 154, the second side panel 155, the third side panel, and the fourth side panel, or it may only include at least one of the above four types of side panel members 15a. The embodiments of this application do not specifically limit the type of side panel member 15a.

[0187] In this embodiment, the side panel component 15a includes at least a first side panel 154 and a second side panel 155. The first side panel 154 and the second side panel 155 can both be connected to the bottom plate 111, that is, the air inlet cavity 301 and the air outlet cavity 302 are both formed on opposite sides along a third direction on the lower box of the box assembly 1. Alternatively, the first side panel 154 and the second side panel 155 can both be connected to the top plate 121, that is, the air inlet cavity 301 and the air outlet cavity 302 are both formed on opposite sides along a third direction on the upper box of the box assembly 1. Alternatively, the first side panel 154 and the second side panel 155 are respectively connected to the top plate 121 and the bottom plate 111, that is, one of the air inlet cavity 301 and the air outlet cavity 302 is formed on the upper box of the box assembly 1, and the other is formed on the lower box of the box assembly 1.

[0188] Of course, in some embodiments, the upper and lower housings of the housing assembly 1 may both have an air inlet cavity 301 and an air outlet cavity 302, that is, there are two air inlet cavities 301 and two air outlet cavities 302.

[0189] Therefore, the air inlet cavity 301 and the air outlet cavity 302 can be set in the first housing 11, or in the second housing 12, or simultaneously or separately in the first housing 11 and the second housing 12, so that they can be flexibly arranged according to the actual air inlet and outlet conditions, thus making them more flexible.

[0190] In some embodiments of this application, the air inlet 13 is disposed on the top plate 121 and / or the bottom plate 111, and / or the air outlet 14 is disposed on the top plate 121 and / or the bottom plate 111. In a projection plane perpendicular to the second direction, the projection of the air inlet 13 falls within the projection range of the air inlet cavity 301, and the projection of the air outlet 14 falls within the projection range of the air outlet cavity 302.

[0191] Thus, the heat exchange gas can flow into the air inlet cavity 301 through the air inlet 13 provided in the top plate 121 and / or the bottom plate 111, and flow out of the air outlet cavity 302 through the air outlet 14 provided in the top plate 121 and / or the bottom plate 111, thereby realizing the circulation of heat exchange gas in the air duct 20 to exchange heat with the battery cell 21.

[0192] like Figure 11 As shown in this embodiment, both the air inlet 301 and the air outlet 302 are formed within the side panel assembly 15 of the first housing 11, and both the air inlet 13 and the air outlet 14 are formed on the base plate 111. Thus, when the electrical device is, for example, a vehicle 1000 or an aircraft 2000, and the base plate 111 of the battery device 100 serves as the base plate of the aforementioned electrical device, external airflow can flow directly into the battery device 100 through the air inlet 13 provided on the base plate 111, and flow in the air duct 20, thereby exchanging heat for the battery cells 21. There is no need to set up an additional cooling mechanism, which simplifies the overall heat exchange structure and helps to achieve the lightweighting of the electrical device.

[0193] In some other embodiments, the air inlet cavity 301 and the air outlet cavity 302 are both formed in the side panel assembly 15 of the second housing 12, and the air inlet 13 and the air outlet 14 can both be formed on the top plate 121. Alternatively, the air inlet cavity 301 and the air outlet cavity 302 are respectively formed in the side panel assembly 15 of the first housing 11 and the second housing 12, and the air inlet 13 and the air outlet 14 can be respectively formed on the top plate 121 and the bottom plate 111.

[0194] In some other embodiments, the air inlet 13 and the air outlet 14 may also be formed on the outer wall 152 of the side panel assembly 15.

[0195] This application embodiment does not specifically limit the formation positions of the air inlet 13 and the air outlet 14, as long as the air inlet 13 is connected to the air inlet cavity 301 and the air outlet 14 is connected to the air outlet cavity 302.

[0196] In some embodiments of this application, there are multiple air vents 153, which are spaced apart along a first direction. The number of air vents 153 is the same as the number of multiple air ducts 20 arranged along the first direction and corresponds one-to-one.

[0197] Therefore, the heat exchange gas flows into the corresponding air duct 20 through the air outlet 153 that corresponds to the air duct 20 in a generally direct manner, which helps to optimize the distribution of the heat exchange gas, improve the uniformity of the heat exchange gas distribution, and enable the heat exchange gas to flow more evenly through each air duct 20 of the battery cell group 2, thereby improving the heat exchange effect.

[0198] In this embodiment, there are multiple air vents 153, and the number is the same as the number of multiple air ducts 20 arranged along the first direction. Each air vent 153 is generally an elongated oval extending along the second direction. In a unified projection plane perpendicular to the third direction, the projection of one air vent 153 falls within the projection range of all air ducts 20 arranged along the second direction. Thus, when there are multiple air ducts 20 between adjacent battery cells 21 along the first direction, one air vent 153 can also correspond to multiple air ducts 20 at the same time, thereby making the air volume distribution of the multiple air ducts 20 arranged along the second direction more uniform.

[0199] Of course, those skilled in the art should understand that in some other embodiments, multiple air vents 153 may be provided along the second direction, that is, multiple rows of air vents 153 are provided along the second direction at intervals along the first direction, so that each air vent 153 corresponds to an air duct 20.

[0200] In some embodiments of this application, along the first direction, the opening area of ​​the air outlet 153 is larger the further away from the air inlet 13.

[0201] This can compensate for the loss of airflow pressure, making the gas flow through each air outlet 153 roughly the same, which helps to further improve the uniformity of heat exchange, making the distribution of heat exchange gas in multiple air ducts 20 more uniform, thereby improving the overall heat exchange effect of the battery device 100.

[0202] For example, the air volume at different locations can be calculated in advance, and when processing each air inlet 153 on the air inlet side, the opening area of ​​each air inlet 153 can be made into an air inlet 153 with a different opening area.

[0203] As another example, valves that can adjust the opening area of ​​each air inlet 153 on the air inlet side can be installed to adjust the opening area of ​​each air inlet 153 in real time according to the actual situation.

[0204] In some embodiments of this application, the thickness of the side panel assembly 15 along a third direction is in the range of 10 mm to 20 mm.

[0205] The thickness of the side panel assembly 15 is within a suitable range, which allows the side panel assembly 15 to have sufficient thickness to open the hollow cavity, and ensures that the overall thickness of the housing assembly 1 is not too thick, thereby facilitating the miniaturization and weight reduction of the battery device 100 as a whole.

[0206] For example, the thickness of the side panel assembly 15 along a third direction can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc.

[0207] In some embodiments of this application, the battery device 100 further includes a seal 4, which is frame-shaped and abuts between the battery cell group 2 and the side panel assembly 15 adjacent to the side panel assembly 15 in a third direction.

[0208] This improves the sealing performance of the collector cavity 303, making it less likely for the heat exchange gas to escape to other locations within the battery device 100. This allows for better control of the flow rate and direction of the heat exchange gas, ensuring that the heat exchange gas circulates within the air duct 20 as much as possible, thereby improving heat exchange efficiency.

[0209] like Figure 12 As shown in this embodiment, the battery cell 21 is supported on the base plate 111. The sealing member 4 is generally semi-frame shaped and includes a first segment 41 extending along a first direction and two second segments 42 extending along a second direction. The two second segments 42 are respectively disposed on opposite sides of the first segment 41 along the first direction. A portion of the first segment 41 abuts against the housing wall of the battery cell 21 facing the top plate 121 along the second direction and the top plate 121, while another portion abuts against the housing wall of the battery cell 21 facing the side plate assembly 15 along the first direction and the side plate assembly 15, thereby forming a good seal at the top. The second segments 42 abut against the housing wall of the battery cell 21 facing the side plate assembly 15 along the first direction and the side plate assembly 15, thereby forming a good seal on both sides.

[0210] In some other embodiments, the seal 4 may also be square-shaped and abut against the battery cell group 2 and the side panel assembly 15 adjacent to the side panel assembly 15 in a third direction.

[0211] In some other embodiments, the sealant 4 can be a sealant.

[0212] This application does not specifically limit the shape and structure of the seal 4, but aims to make the collecting cavity 303 a relatively sealed chamber, so that the gas flowing into the collecting cavity 303 through the air inlet cavity 301 can flow into the air duct 20 as much as possible.

[0213] In some embodiments of this application, the housing assembly 1 includes a side panel assembly 15, which surrounds the battery cell group 2, and a ventilation cavity 30 is formed between the battery cell group 2 adjacent to the side panel assembly 15 along a third direction.

[0214] In some embodiments, the side panel assembly 15 does not have a ventilation cavity 30 inside; instead, the ventilation cavity 30 is directly formed within the receiving cavity 10 of the housing assembly 1. That is, the aforementioned collecting cavity 303 is directly configured as the ventilation cavity 30. For example, a space is formed between the battery cell group 2 adjacent to the side panel assembly 15 along a third direction and the side panel assembly 15. One side of the space is configured as an air inlet cavity, and the other side of the space along a third direction is configured as an air outlet cavity. The air inlet 13 and the air outlet 14 can be formed on the bottom plate 111 and / or the top plate 121, or they can be formed on the side panel assembly 15.

[0215] Therefore, the air duct 20 of the battery cell pack 2 can also be directly connected to the outside through the ventilation cavity 30 formed inside the housing cavity 10, which has a simple structure and good heat exchange effect.

[0216] In some embodiments of this application, such as Figure 13 As shown, the gasket assembly 3 includes a heat insulation member 31 and a frame member 32 surrounding the heat insulation member 31. The two ends of the frame member 32 along the first direction respectively abut against the housing wall 22 of the adjacent battery cell 21.

[0217] In this embodiment of the application, the gasket assembly 3 is used to isolate heat between adjacent battery cells 21 along the first direction and to buffer the expansion of the battery cells 21, thereby reducing the possibility of thermal diffusion of the battery cells 21 and improving the reliability of the battery device 100.

[0218] The frame member 32 is generally frame-shaped, and the heat insulation member 31 is placed inside the frame member 32. Thus, the frame member 32 can provide additional structural support for the gasket assembly 3, reducing the possibility of displacement or deformation of the gasket assembly 3 when the battery cell 21 expands or is subjected to external impact, thereby maintaining the integrity and functionality of the gasket assembly 3.

[0219] Furthermore, encapsulating the heat insulation component 31 within the frame component 32 makes it easier to install and maintain the gasket assembly 3 as a whole, and makes it easier to fix and separate the gasket assembly 3 from the battery cell 21.

[0220] In some embodiments of this application, the frame member 32 is configured as an elastic member whose thickness along the first direction can vary with the expansion of the battery cell 21.

[0221] During the charge and discharge cycle, the internal electrode components and electrolyte of the battery cell 21 undergo chemical reactions, resulting in phenomena such as negative electrode expansion or gas generation causing the battery cell 21 to expand.

[0222] Especially for lithium metal batteries that use lithium metal as the negative electrode, the negative electrode expands in volume during cycling, which leads to a continuous increase in the thickness of the electrode assembly, causing the battery cell 21 to bulge or even fail.

[0223] The frame member 32 of this application embodiment can absorb the expansion of the battery cell 21, thereby reducing the degree of expansion of the battery cell 21, reducing the risk caused by expansion, and improving the cycle life of the battery device 100.

[0224] Moreover, since the frame member 32 can also act as a buffer to absorb the expansion of the battery cell 21, there is no need to set up an additional buffer structure. This can effectively reduce the number of parts in the battery device 100, reduce the weight of the battery device 100, reduce production costs, and improve the space utilization rate in the housing assembly 1, so that more battery cells 21 can be arranged in the housing assembly 1, which is beneficial to improving the energy density of the battery device 100.

[0225] In addition, since the thickness of the frame member 32 along the first direction can change with the expansion of the battery cell 21, it can provide a suitable expansion space for the battery cell 21, so that the expansion force of the battery cell 21 can be released evenly, reducing the possibility of free expansion of the battery cell 21, reducing the polarization accumulation of the battery cell 21, and improving the performance of the battery device 100.

[0226] In some embodiments of this application, the frame member 32 includes silicone-based materials or foamed polypropylene-based materials.

[0227] Silicone-based materials and foamed polypropylene materials have good high-temperature resistance, enabling the frame component 32 to provide good encapsulation and support even in high-temperature environments, and also exhibiting good insulation and flame-retardant properties. Furthermore, both silicone-based materials and foamed polypropylene materials possess good elasticity.

[0228] In addition, the low density and light weight of these two materials help reduce the overall weight of the battery device 100, which is beneficial to the lightweight design of the battery device 100.

[0229] Of course, those skilled in the art will understand that in some other embodiments, the frame member 32 may also be made of any other suitable material.

[0230] In some embodiments of this application, the thermal insulation component 31 includes at least one of aerogel thermal insulation materials, foamed thermal insulation materials, and ceramic thermal insulation materials.

[0231] Aerogel is a lightweight porous material with a three-dimensional network structure. Its unique nanoporous structure and low density give it excellent thermal insulation properties. Furthermore, aerogel also exhibits good compressibility.

[0232] Therefore, the heat insulation component 31 made of aerogel material can effectively insulate the heat generated by the battery cell 21, and can also absorb the expansion force of the battery cell 21 to a certain extent, which is beneficial to improving the service life of the battery cell 21.

[0233] In addition, the lightweight nature of aerogel materials contributes to the weight reduction of the battery device 100.

[0234] For example, the aerogel layer can be a pre-oxygenated fiber aerogel layer, a ceramic fiber aerogel layer, a silica aerogel composite glass fiber, or a silica aerogel composite ceramic fiber, etc.

[0235] Foamed materials include, but are not limited to, foamed polyurethane, foamed polypropylene, foamed polystyrene, foamed silicone rubber, foamed polyamide resin, foamed polyethylene terephthalate / butylene glycol, and foamed phenolic resin. These materials have low thermal conductivity, thus exhibiting good thermal insulation properties, and also possess good compressibility, thereby providing a certain degree of buffering and energy absorption. Furthermore, the low density and light weight of foamed materials are also beneficial for the lightweight design of the battery device 100.

[0236] Ceramic insulation materials have low thermal conductivity, good thermal and chemical stability, good electrical insulation properties, and typically have low density and high strength.

[0237] This application does not specifically limit the types of aerogel-based heat insulation materials, foam-based heat insulation materials, and ceramic-based heat insulation materials, as long as they can provide good heat insulation for the battery cell 21.

[0238] In some embodiments of this application, the material of the heat insulation component 31 includes at least one of ceramic fiber, glass fiber, aerogel, pre-oxidized fiber, organic foam, silica, and alumina fiber.

[0239] The aforementioned materials have excellent thermal insulation properties, which can effectively reduce the heat diffusion between battery cells 21 and / or between battery cells 21 and other surrounding components, reduce the possibility of thermal runaway, and improve the overall reliability of the battery device 100.

[0240] Of course, those skilled in the art will understand that in some other embodiments, the thermal insulation element 31 may also be made of any other suitable material.

[0241] In some embodiments of this application, the thermal conductivity of the heat insulation element 31 is in the range of 0.03 W / (m·K) to 0.1 W / (m·K).

[0242] Thermal conductivity, also known as thermal conductivity, is an important physical quantity that measures a material's ability to conduct heat. It is defined as the amount of heat transferred per unit time through a 1-square-meter area under steady-state heat transfer conditions, when the material thickness is 1 meter and the temperature difference between its two surfaces is 1 degree Celsius (K or °C). The unit of thermal conductivity is usually watts per meter per Kelvin (W / (m*K)), but it is sometimes expressed in joules per square meter Kelvin (J / (m*K)) in the International System of Units (SI). The magnitude of thermal conductivity has a significant impact on the heat insulation or heat dissipation performance of a material. For example, materials with low thermal conductivity perform well in heat insulation, while materials with high thermal conductivity are suitable for applications requiring rapid heat transfer.

[0243] Therefore, the thermal conductivity of the heat insulation component 31 is within a suitable range, which can provide good heat insulation and thus more effectively block heat transfer between battery cells 21 and / or between battery cells 21 and other surrounding components.

[0244] In some embodiments of this application, although not shown in the figures, the gasket assembly 3 also includes an encapsulation for encapsulating the thermal insulation 31 within the frame member 32. The encapsulation comprises a polyimide material or a high-temperature resistant polyester material.

[0245] Therefore, the encapsulation component can provide good insulation and encapsulation for the heat insulation component 31, reduce the possibility of the heat insulation component 31 being affected by the external environment, and extend the service life of the heat insulation component 31.

[0246] In addition, polyimide or high-temperature resistant polyester materials have excellent physical properties, chemical properties and dimensional stability, as well as excellent mechanical properties and good heat resistance. They are not easily damaged in high-temperature environments, which helps to improve the overall reliability of the gasket assembly 3 and thus better insulate and buffer the battery cell 21.

[0247] For example, the encapsulation component can be a PET film (high temperature resistant polyester film). PET film has excellent physical properties, chemical properties and dimensional stability, as well as excellent mechanical properties, good heat resistance, high toughness, and good tensile strength and impact resistance. Therefore, PET film is not easily damaged in high temperature environments and does not easily affect the function of the heat insulation component 31 in absorbing the expansion of the battery cell 21.

[0248] As an example, the encapsulation component may also be a PI film (polyimide film), a PP film (polypropylene film), a PC film (polycarbonate film), a PVC film (polyvinyl chloride film), etc.

[0249] In some embodiments of this application, the battery cell 21 includes a first housing wall 221 facing away from each other along a first direction, the first housing wall 221 being the housing wall 22 with the largest area in the battery cell 21; the gasket assembly 3 is in contact with the first housing wall 221.

[0250] Thus, the gasket assembly 3 contacts the first housing wall 221 to insulate the large surface of the battery cell 21, and part of the first housing wall 221 forms the air duct wall of the air duct 20, so that the heat exchange gas flows between the housing walls 22 with the largest area of ​​the battery cell 21, thereby better conducting the heat of the battery cell 21 or better conducting heat to the battery cell 21, and further improving the heat conduction efficiency of the battery cell 21.

[0251] In some embodiments of this application, the housing assembly 1 includes a stacked insulating structure layer and a fiber composite material layer. Along the second direction, the insulating structure layer is located between the fiber composite material layer and the battery cell 21, and the second direction intersects with the first direction.

[0252] The fiber composite material layer provides good structural strength, and the insulating structural layer not only supports the battery cell 21, but also electrically isolates the battery cell 21 from the outside world, reducing external interference to the battery cell 21. The combination of the insulating structural layer and the fiber composite material layer allows the housing assembly 1 to take into account both structural strength and protective performance.

[0253] In addition, the lightweight nature of fiber composite materials helps to achieve overall lightweighting of the housing component 1.

[0254] In the embodiments of this application, the insulating structural layer can be made of a single material or a composite material, and the fiber composite material layer is made of a composite material. A composite material refers to a composite material composed of two or more materials with different physical or chemical properties.

[0255] In some embodiments, the composite material includes a substrate and auxiliary materials. The substrate encapsulates, supports, and connects the auxiliary materials, which in turn enhance chemical or physical properties such as structural strength and insulation. The auxiliary materials are pre-impregnated in the substrate to form a structural layer.

[0256] In this embodiment, the side panel assembly 15 is integrally provided with an insulating structural layer on the inner side of the corresponding cavity 10 (inner wall 151 of the side panel), or the side panel assembly 15 is partially provided with an insulating structural layer on the inner side of the corresponding cavity 10. The top plate 121 and / or the bottom plate 111 are integrally provided with an insulating structural layer on the inner side of the corresponding cavity 10, or the top plate 121 and / or the bottom plate 111 are partially provided with an insulating structural layer on the inner side of the corresponding cavity 10. It is understood that an integrally provided insulating layer has a better insulation effect.

[0257] The insulating structure layer may include a first fiber fabric, and the fiber composite material layer may include a second fiber fabric. The first fiber fabric includes multiple first fibers, and the second fiber fabric includes multiple second fibers. The first fibers are different from the second fibers, and the density of the second fibers is less than the density of the first fibers.

[0258] For example, the first fiber includes at least one of glass fiber, basalt fiber, and aramid fiber, and / or the second fiber includes at least one of carbon fiber and polyethylene fiber.

[0259] In some embodiments of this application, such as Figure 5 As shown, the housing assembly 1 includes a base plate 111 and a side plate assembly 15. The battery cell group 2 is supported on the base plate 111. The side plate assembly 15 includes two side plate members 15a disposed on opposite sides of the base plate 111 along a second direction. At least a partial insulating structural layer forms the inner wall 151 of the side plate member 15a facing the inside of the receiving cavity, and a fiber composite material layer forms the outer wall 152 of the side plate member 15a facing the outside of the receiving cavity.

[0260] This ensures both the protective effect and facilitates the connection between the insulation layer and the fiber composite layer.

[0261] In some embodiments of this application, such as Figure 5 and Figure 9 As shown, the side plate assembly 15 also includes two beam members 15b, which are connected to opposite sides of the base plate 111 along the first direction, and adjacent beam members 15b are connected to the side plate members 15a.

[0262] Thus, the beam member 15b can constrain the battery cell group 2 in the first direction to withstand the expansion force of the battery cell 21.

[0263] In this embodiment, the side plate member 15a and the beam member 15b may have the same or different structures. In some examples, the side plate member 15a and the beam member 15b have different structures. The side plate member 15a is disposed opposite to each other on both sides of the bottom plate 111 and the top plate 121 along a third direction, and the side plate member 15a is used to limit the battery cell 21 along the third direction. The two beam members 15b are disposed opposite to each other on both sides of the bottom plate 111 along a first direction, and the beam members 15b are used to limit the battery cell 21 along the first direction. The beam members 15b correspond to the large surface of the battery cell 21 (i.e., the first housing wall 221), and the load-bearing capacity of the beam members 15b is greater than that of the side plate member 15a.

[0264] In some examples, the side plate member 15a is a cuboid structure and the beam member 15b is a structure with an approximately trapezoidal cross section. In other words, the dimensions of the beam member 15b gradually decrease along the thickness direction (second direction) of the base plate 111 away from the base plate 111.

[0265] In the embodiments of this application, the two beam members 15b may adopt the same or different structures. In some examples, the two beam members 15b adopt similar structures. The beam member 15b includes an insulating structural layer and a fiber composite material layer. At least part of the insulating structural layer forms the wall surface of the beam member 15b facing the receiving cavity 10. In other words, the insulating structural layer serves as the inner wall of the beam member 15b relative to the receiving cavity 10. The fiber composite material layer forms the wall surface of the beam member 15b away from the receiving cavity 10. In other words, the fiber composite material layer serves as the outer wall of the beam member 15b relative to the receiving cavity 10.

[0266] In some examples, a hollow cavity is formed between the insulating structural layer and the fiber composite layer of the beam member 15b, and the cavity contains a support.

[0267] In some embodiments of this application, the side panel assembly 15 is configured to have a hollow cavity located between the insulating structure layer and the fiber composite material layer of the side panel assembly 15, and at least part of the hollow cavity is configured as an air inlet cavity 301 or an air outlet cavity 302.

[0268] The hollow cavity design helps reduce the overall weight of the side panel assembly 15, thus contributing to the lightweighting of the housing assembly 1. Furthermore, the hollow cavity can also serve as a heat insulation layer, improving the thermal management capability of the battery device 100. At least a portion of the hollow cavity can be configured as an air inlet 301 and an air outlet 302, further enhancing the thermal management capability of the battery device 100.

[0269] In some embodiments of this application, the side panel assembly 15 further includes a support structure located in the hollow cavity and abutting against at least one of the insulating structural layer and the fiber composite material layer of the side panel assembly 15.

[0270] Therefore, the supporting structure can provide support for the insulation layer and the fiber composite layer, thereby improving their resistance to deformation. In addition, the supporting structure can also disperse impacts and enhance the structural stability of the housing assembly 1.

[0271] Supporting structures can be, for example, columnar structures, ribbed structures, shell structures, plate structures, mesh structures, honeycomb structures, or filling structures. One or more supporting structures can be installed within the hollow cavity.

[0272] In the embodiments of this application, the support structure may abut against the insulating structure layer, or against the fiber composite material layer, or one side of the support structure abuts against the insulating structure layer and the other side of the support structure abuts against the fiber composite material layer.

[0273] In the embodiments of this application, the support structure can also be connected to the corresponding insulating structure layer and fiber composite material layer by means of snap-fitting, bonding, welding, fastener connection, riveting, etc., thereby improving the connection strength.

[0274] A second aspect of this application provides an electrical device that includes a battery device 100 as described in the first aspect of this application for providing electrical energy.

[0275] The electrical device provided in this application embodiment, by employing the battery device 100 as described above, helps to improve the heat exchange efficiency of the electrical device, enabling the battery device 100 to better provide or store electrical energy to the electrical device. Furthermore, the risk of the electrical device failing due to a battery device 100 malfunction is reduced, decreasing maintenance time and resulting in higher reliability and better stability. Additionally, it contributes to achieving overall lightweight design of the electrical device.

[0276] A third aspect of this application provides an energy storage device, including a battery device 100 as described in the first aspect of this application for storing or providing electrical energy.

[0277] The energy storage device provided in this application embodiment, by employing the battery device 100 as described above, helps to improve the heat exchange efficiency of the energy storage device, enabling the battery device 100 to better provide or store electrical energy to the energy storage device. Furthermore, the risk of failure due to battery device 100 malfunction is reduced, maintenance time is decreased, and reliability and stability are improved. In addition, it contributes to the overall lightweighting of the energy storage device.

[0278] The following describes specific examples of some embodiments of this application with reference to the accompanying drawings.

[0279] As a specific example, the battery assembly 100 includes a lower housing (first housing 11), a battery cell (battery cell 21), a large heat insulation pad (gasket assembly 3), a top cover (second housing 12), and a buffer sealing gasket (sealant 4). The bottom of the lower housing has an air inlet (air inlet 13) and an air outlet (air outlet 14). A cavity (air inlet cavity 301) is provided in one side beam (side plate component 15a) of the lower housing, which communicates with the bottom air inlet. The side wall of the side beam has an opening (air outlet 153) facing the battery cell side. The air volume at different positions is balanced by adjusting the size of the opening. A cavity (air outlet cavity 302) is provided in the other side beam, which communicates with the bottom air outlet. The side wall of the side beam has an opening facing the battery cell side.

[0280] A buffer sealing gasket is filled between the top cover and the side of the battery cell to form a sealed cavity (collecting cavity 303) between the side beam of the box, the top cover and the battery cell. Both the air inlet and outlet sides are filled with sealing elements to form a collecting cavity.

[0281] Multiple large-area heat insulation pads arranged along the height direction (second direction) of the battery cells are sandwiched between the cells. The gap between adjacent large-area heat insulation pads along the second direction forms an air-cooling channel (air duct 20), which connects to the collection cavities on both sides. The large-area heat insulation pads are divided into two parts: a buffer frame (frame piece 32) and a heat insulation core material (heat insulation piece 31). The buffer frame is deformable and can absorb the expansion deformation of the battery cells, while the heat insulation core material does not deform or deforms very little, and is used to isolate the heat during thermal runaway of the battery cells.

[0282] Cooling air enters the side beam of the lower housing through an air inlet on one side of the bottom of the housing, and then is distributed into the collector chamber through the air inlet (air inlet 153 on the air inlet side) on the side beam. It then flows through the air-cooling channel along the height of the large surface of the battery cell, cooling the large surface of the cell. The cooled air enters the collector chamber on the other side, and then enters the side beam of the housing on the other side through the exhaust vent (air outlet 153 on the air outlet side) on the side wall of the housing, before being discharged outside the housing assembly 1 through the exhaust vent. The battery device 100 does not add any additional cooling components; it utilizes the cooperation between existing structural components to form a cooling circuit to achieve cooling or heating of the battery cells.

[0283] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. 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 device includes: The housing assembly has an internal cavity. A battery cell assembly is located within the receiving cavity, the battery cell assembly comprising a plurality of battery cells arranged along a first direction; At least one air duct for airflow is formed between adjacent battery cells along the first direction. The air duct is connected to the outside. A portion of the casing wall of each adjacent battery cell constitutes the air duct wall opposite to the air duct along the first direction.

2. The battery device according to claim 1, characterized in that, The battery device includes a spacer assembly located between adjacent battery cells along the first direction; The number of spacer assemblies between adjacent battery cells along the first direction is at least two, and at least two spacer assemblies are arranged at intervals along the second direction to form at least one interval region, the interval region constituting the air duct; The second direction intersects with the first direction.

3. The battery device according to claim 2, characterized in that, The air duct extends in a third direction; The battery device has a ventilation cavity that is connected to the air duct. The ventilation cavity includes an air inlet cavity and an air outlet cavity. The air inlet cavity is located on one side of the battery cell group along the third direction, and the air outlet cavity is located on the other side of the battery cell group along the third direction. The housing assembly is provided with an air inlet and an air outlet, the air inlet being connected to the air inlet cavity and the air outlet being connected to the air outlet cavity; The third direction intersects with both the first and second directions.

4. The battery device according to claim 3, characterized in that, The battery device includes a plurality of battery cell groups, each of the battery cell groups being arranged along the third direction to form a battery cell array, the battery cell array including a battery cell row, the battery cell row including a plurality of battery cells arranged along the third direction; The air duct is located between two adjacent rows of battery cells along the first direction; The air inlet cavity is located on one side of the battery cell array along the third direction, and the air outlet cavity is located on the other side of the battery cell array along the third direction.

5. The battery device according to claim 3, characterized in that, The housing assembly includes a side panel assembly, which includes an inner wall facing the interior of the receiving cavity and an outer wall facing the exterior of the receiving cavity. A hollow cavity is formed between the inner wall and the outer wall, and the hollow cavity is configured as at least a portion of the air inlet cavity or at least a portion of the air outlet cavity. The inner wall of the side panel also has an air vent, and the hollow cavity is connected to each of the air ducts through the air vent.

6. The battery device according to claim 5, characterized in that, The ventilation cavity also includes a flow collection cavity; A current collection cavity is formed between the battery cell group adjacent to the side panel assembly along the third direction and the side panel assembly. The current collection cavity is connected to each of the air ducts, and the hollow cavity is connected to the current collection cavity through the air outlet.

7. The battery device according to claim 5, characterized in that, The housing assembly includes a first housing and a second housing, which are fastened together to form the receiving cavity; The first housing includes a bottom plate, on which the battery cell pack is supported; the second housing includes a top plate, which is located on the opposite side of the bottom plate along the second direction. The side panel assembly includes side panel members disposed opposite each other along the second direction. The side panel members include a first side panel disposed on the air inlet side and a second side panel disposed on the air outlet side. The air inlet cavity is formed in the first side panel, and the air outlet cavity is formed in the second side panel. The first side plate and the second side plate are both connected to the bottom plate, and / or the first side plate and the second side plate are both connected to the top plate, or the first side plate and the second side plate are respectively connected to the top plate and the bottom plate.

8. The battery device according to claim 7, characterized in that, The air inlet is disposed on the top plate and / or the bottom plate; and / or The air outlet is located on the top plate and / or the bottom plate; In a projection plane perpendicular to the second direction, the projection of the air inlet falls within the projection range of the air inlet cavity, and the projection of the air outlet falls within the projection range of the air outlet cavity.

9. The battery device according to any one of claims 5 to 8, characterized in that, The number of air vents is multiple, and the multiple air vents are spaced apart along the first direction; The number of air vents is the same as the number of the plurality of air ducts arranged along the first direction and corresponds one-to-one.

10. The battery device according to claim 9, characterized in that, Along the first direction, the opening area of ​​the air outlet is larger the further away from the air inlet.

11. The battery device according to any one of claims 5 to 8, characterized in that... The thickness of the side panel assembly along the third direction is in the range of 10 mm to 20 mm.

12. The battery device according to any one of claims 5 to 8, characterized in that, The battery device further includes a seal that is frame-shaped and abuts against the battery cell assembly and the side panel assembly adjacent to the side panel assembly along the third direction.

13. The battery device according to claim 3 or 4, characterized in that, The housing assembly includes a side panel assembly that surrounds the battery cell group. A ventilation cavity is formed between the battery cell group adjacent to the side panel assembly along the third direction.

14. The battery device according to any one of claims 2 to 8, characterized in that, The gasket assembly includes a heat insulation element and a frame element surrounding the heat insulation element, wherein the two ends of the frame element along the first direction respectively abut against the respective housing walls of the adjacent battery cells.

15. The battery device according to claim 14, characterized in that, The frame member is configured to be an elastic member whose thickness along the first direction can vary with the expansion of the battery cell.

16. The battery device according to claim 14, characterized in that, The frame components include silicone-based materials or foamed polypropylene materials.

17. The battery device according to claim 14, characterized in that, The thermal insulation component includes one of the following: aerogel thermal insulation material, foamed thermal insulation material, and ceramic thermal insulation material.

18. The battery device according to claim 17, characterized in that, The material of the thermal insulation component includes one of ceramic fiber, glass fiber, aerogel, pre-oxidized fiber, organic foam, silica, and alumina fiber.

19. The battery device according to claim 14, characterized in that, The thermal conductivity of the insulation component is in the range of 0.03 W / (m·K) to 0.1 W / (m·K).

20. The battery device according to claim 14, characterized in that, The gasket assembly further includes an encapsulation component for encapsulating the thermal insulation component within the frame component; The encapsulation component comprises polyimide material or high-temperature resistant polyester material.

21. The battery device according to any one of claims 1 to 8, characterized in that, The battery cell includes a first housing wall opposite to the first direction, and the first housing wall is the housing wall with the largest area in the battery cell. The gasket assembly contacts the first housing wall.

22. The battery device according to any one of claims 1 to 8, characterized in that, The housing assembly includes a stacked insulating structure layer and a fiber composite material layer, wherein, along the second direction, the insulating structure layer is located between the fiber composite material layer and the battery cell; The second direction intersects with the first direction.

23. The battery device according to claim 22, characterized in that, The housing assembly includes a bottom plate and a side plate assembly. The battery cell pack is supported on the bottom plate. The side plate assembly includes two side plate members disposed on opposite sides of the bottom plate along the second direction. At least a portion of the insulating structural layer forms the inner wall of the side plate member facing the interior of the receiving cavity, and the fiber composite material layer forms the outer wall of the side plate member facing the exterior of the receiving cavity.

24. The battery device according to claim 23, characterized in that, The side plate assembly further includes two beam members, which are connected to opposite sides of the base plate along the first direction, and adjacent beam members are connected to the side plate members.

25. The battery device according to claim 23, characterized in that, The side panel assembly is configured to have a hollow cavity, which is located between the insulating structure layer and the fiber composite material layer of the side panel assembly, and at least a portion of the hollow cavity is configured as an air inlet cavity or an air outlet cavity.

26. The battery device according to claim 25, characterized in that, The side panel assembly further includes a support structure located in the hollow cavity and abutting against at least one of the insulating structural layer and the fiber composite material layer of the side panel assembly.

27. The battery device according to any one of claims 1 to 8, characterized in that, The housing assembly includes a first housing and a second housing that are sealed together, and the first housing and the second housing are fastened together to form the receiving cavity.

28. An electrical appliance, characterized in that, The electrical device includes a battery device according to any one of claims 1 to 27 for providing electrical energy.

29. The electrical appliance according to claim 28, characterized in that, The electrical equipment includes aircraft.

30. An energy storage device, characterized in that, The energy storage device includes a battery device according to any one of claims 1 to 27 for storing or providing electrical energy.

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