Battery device and electric device

Abstract

The invention is applicable to the field of batteries, and provides a battery device and a power utilization device.The battery device comprises a box body, the box body comprises a box cover and a box body, the box cover and the box body are connected and define a containing space, the box cover comprises a main body part and a boss part, and the boss part protrudes in the direction away from the box body; the battery monomer assembly is arranged in the accommodating space, and the battery monomer assembly comprises a plurality of battery monomers which are arranged in sequence; the bracket is arranged between the battery monomer assembly and the box cover, and the bracket and the boss part are oppositely arranged; the first thermal protection structure is positioned in the accommodating space and is arranged on the main body part; the first thermal protection structure and the support are arranged in a non-overlapping mode in the thickness direction of the box cover. According to the battery device and the power utilization device provided by the embodiment of the invention, the reliability is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0003] Improving battery reliability is a crucial research direction in battery technology development. A battery consists of a casing and multiple individual cells housed within it. When a cell experiences thermal runaway, it releases high-temperature, high-pressure emissions. These emissions impact the casing's cover, potentially causing it to be punctured or ignited, thus affecting battery reliability. Summary of the Invention

[0004] In view of this, embodiments of this application provide a battery device and an electrical device that can improve the reliability of the battery device.

[0005] An embodiment of the first aspect of this application provides a battery device, comprising: a housing, including a cover and a body, the cover being connected to the body and forming an accommodating space, the cover including a main body and a boss, the boss protruding in a direction away from the body; a battery cell assembly disposed within the accommodating space, the battery cell assembly including a plurality of battery cells; a bracket disposed between the battery cell assembly and the cover, the bracket being disposed opposite to the boss and used to support the component accommodated in the boss; a first thermal protection structure located within the accommodating space, the first thermal protection structure being disposed on the main body; the first thermal protection structure and the bracket being disposed non-overlapping along the thickness direction of the cover.

[0006] In the battery device provided in the above embodiments, the bracket can provide thermal protection for the protrusion, and the first thermal protection structure provides thermal protection for the main body, thereby reducing the risk of the lid being punctured by exhaust materials or the lid catching fire. The first thermal protection structure avoids the bracket and can be directly installed on the main body, solving the problem of reduced exhaust space at the top of the casing due to the low installation height of the protective structure. This improves the exhaust flow of the battery device, reduces the risk of heat diffusion and the risk of thermal runaway of the battery device as a whole, and improves the reliability of the battery device. Furthermore, since the first thermal protection structure is staggered from the bracket, the redundant design cost of the protective structure is reduced, thereby reducing the overall cost of the battery device.

[0007] In some embodiments, a first thermal protection structure is connected to the surface of the main body facing the housing body, and the first thermal protection structure has a clearance opening for avoiding the support.

[0008] By adopting the above technical solution, the first thermal protection structure is fixedly connected to the surface of the main body, and the clearance opening of the first thermal protection structure can avoid the bracket. In this way, the installation height of the first thermal protection structure is not affected by the bracket, which improves the ventilation of the top of the box, reduces the risk of heat diffusion caused by poor ventilation, and improves the reliability of the battery device.

[0009] In some embodiments, the first thermal protection structure is adhered to the surface of the main body.

[0010] By adopting the above technical solution, the first thermal protection structure does not need to be fixed with screws or other fasteners, further saving protection costs.

[0011] In some embodiments, the first thermal protection structure has a perforated portion at the boss to form an avoidance opening, or the first thermal protection structure includes a plurality of protective portions, which are respectively fixedly connected to the main body portion, and at least two protective portions are spaced apart at the boss to form an avoidance opening.

[0012] By adopting the above technical solution, the first thermal protection structure can be an integral structure or a split structure. The first thermal protection structure can be flexibly set to adapt to the structure of the box cover.

[0013] In some embodiments, the battery device further includes an electronic control component disposed on the bracket and housed within the boss portion.

[0014] By adopting the above technical solution, the space inside the boss can be effectively utilized, which is conducive to improving the energy density of the battery. In addition, the bracket can support the electronic control components and withstand the impact of the emissions released by the battery cells, thus providing thermal protection for both the electronic control components and the boss.

[0015] In some embodiments, the battery cell has a pressure relief mechanism disposed on the side of the battery cell facing the cover; along the thickness direction of the cover, the first thermal protection structure overlaps with a plurality of the battery cells, and the bracket overlaps with at least one of the battery cells.

[0016] By adopting the above technical solution, when the pressure relief mechanism is activated, the emissions discharged from the battery cells will flow toward the cover. The first thermal protection structure and the bracket can prevent the emissions from directly impacting the cover, reducing the risk of cover damage and fire, and improving the reliability of the battery device.

[0017] In some embodiments, along the thickness direction of the cover, the distance from the surface of the first thermal protection structure away from the cover to the battery cell assembly is greater than the distance from the surface of the support away from the cover to the battery cell assembly.

[0018] By adopting the above technical solution, the exhaust space between the battery cell assembly and the first thermal protection structure is improved, which is conducive to the smooth flow of emissions in the box and reduces the risk of thermal diffusion.

[0019] In some embodiments, the first thermal protection structure is a mica plate or a flexible high-temperature resistant layer.

[0020] By adopting the above technical solution, the first thermal protection structure can be a rigid mica board or a flexible high-temperature resistant layer, which can be selected according to the material or thickness of the box cover to obtain a good thermal protection effect.

[0021] In some embodiments, the lid is a metal lid, and the first thermal protection structure is a mica plate.

[0022] By adopting the above technical solutions, mica sheets can improve the impact resistance of metal box covers, and mica sheets can also improve the heat resistance of metal box covers, thus providing good thermal protection for metal box covers.

[0023] In some embodiments, the first thermal protection structure is a mica plate with a thickness of 1 mm to 2 mm.

[0024] By adopting the above technical solution, the first thermal protection structure can provide good impact protection for the metal box cover; the first thermal protection structure is lightweight and can be easily attached to the main body; at the same time, the first thermal protection structure occupies little space and has little impact on the flow of flue gas inside the box.

[0025] In some embodiments, the battery device further includes a second thermal protection structure disposed on at least one of the support and the boss portion.

[0026] By adopting the above technical solution, the second thermal protection structure can be combined with the bracket to protect the protrusion, further reducing the risk of the protrusion being punctured, burning and catching fire.

[0027] In some embodiments, the second thermal protection structure includes a first flexible high-temperature resistant layer, which is attached to the surface of the protrusion facing the receiving space.

[0028] By adopting the above technical solution, the first flexible high-temperature resistant layer and the bracket provide dual protection for the boss. Even if the high-temperature emissions break through the bracket, the first flexible high-temperature resistant layer can still protect the boss, reducing the risk of the boss being broken or catching fire.

[0029] In some embodiments, the first flexible high-temperature resistant layer is mica paper, and the thickness of the first flexible high-temperature resistant layer is less than or equal to 1 mm.

[0030] By adopting the above technical solution, the first flexible high-temperature resistant layer can improve the heat resistance of the boss and reduce the risk of fire and combustion of the boss; the thickness of the first flexible high-temperature resistant layer is less than or equal to 1 mm, which can fit well into the surface of the boss.

[0031] In some embodiments, the boss portion includes a boss top wall and a boss side wall, the boss side wall being connected between the main body portion and the boss top wall; a first flexible high-temperature resistant layer is at least attached to the boss side wall, and along the thickness direction of the cover, the first flexible high-temperature resistant layer at least overlaps with the edge of the bracket.

[0032] By adopting the above technical solution, the first flexible high-temperature resistant layer is at least overlapped with the edge of the bracket. Even if the emissions generated by the battery cell flow from the edge of the bracket toward the protrusion, the first flexible high-temperature resistant layer can still provide thermal protection for the protrusion.

[0033] In some embodiments, the first flexible high-temperature resistant layer extends from the sidewall of the boss to the main body, and the first flexible high-temperature resistant layer partially overlaps with the first thermal protection structure.

[0034] By adopting the above technical solution, it is possible to increase the bonding area and bonding strength between the first flexible high-temperature resistant layer and the box cover, and also to improve the thermal protection effect of the edge of the boss.

[0035] In some embodiments, the second thermal protection structure includes a second flexible high-temperature resistant layer, which is attached to the surface of the support facing the battery cell assembly.

[0036] By adopting the above technical solution, the second flexible high-temperature resistant layer can improve the high-temperature resistance of the support, reduce the risk of the support being melted through, and thus reduce the impact of emissions on the boss.

[0037] In some embodiments, the second flexible high-temperature resistant layer is mica paper, and the thickness of the second flexible high-temperature resistant layer is less than or equal to 0.35 mm.

[0038] By adopting the above technical solution, the second flexible high-temperature resistant layer is mica paper, which is easy to attach to the surface of the bracket; the thickness of the second flexible high-temperature resistant layer is small, which can reduce the occupation of the exhaust space and facilitate the rapid discharge of emissions from the box.

[0039] In some embodiments, the lid is a composite lid made of composite material, the boss portion has a thickened portion, the thickness of the thickened portion is greater than the thickness of the main body portion, and the thickened portion overlaps at least with the edge of the bracket.

[0040] By adopting the above technical solution, the box cover is a composite box cover. The box cover itself has good thermal shock resistance and is not easy to burn. At the same time, by setting the boss part with a thickened part and making the thickened part overlap with the edge of the support, the impact resistance of the boss part can be improved.

[0041] In some embodiments, the thickness of the thickened portion is 3mm to 5mm.

[0042] By adopting the above technical solution, the thickened part has better impact resistance, thus avoiding excessive weight of the lid.

[0043] In some embodiments, the cover is a composite cover made of composite material, the thickness of the main body is greater than or equal to 3 mm, and a first thermal protection structure is formed on a portion of the main body near the battery cell assembly.

[0044] By adopting the above technical solution, the bracket can protect the protrusion. At the same time, the cover itself has good thermal protection performance, eliminating the need to set a high-temperature resistant plate under the bracket. This solves the problems of the high-temperature resistant plate affecting the exhaust space and the redundancy of the protective structure.

[0045] An embodiment of the second aspect of this application provides an electrical device, including a battery device as described in the first aspect, the battery device being used to store or provide electrical energy.

[0046] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0049] Figure 2 This is a schematic diagram of the exploded structure of a single battery cell provided in some embodiments of this application;

[0050] Figure 3 This is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0051] Figure 4 This is a cross-sectional view of the battery device provided in the first embodiment of this application;

[0052] Figure 5 yes Figure 4 A schematic diagram of the battery pack cover, the first thermal protection structure, and the second thermal protection structure shown in the diagram.

[0053] Figure 6 This is a partial cross-sectional view of the battery device provided in the second embodiment of this application;

[0054] Figure 7 This is a partial cross-sectional view of the battery device provided in the third embodiment of this application;

[0055] Figure 8 This is a partial cross-sectional view of the battery device provided in the fourth embodiment of this application.

[0056] The markings in the diagram mean:

[0057] 1000, Vehicle; 100, Battery unit; 200, Motor; 300, Controller; 10, Housing; 101, Accommodation space; 11, Housing cover; 111, Main body; 112, Boss; 1121, Top wall; 1122, Side wall; 1123, Thickened part; 12, Housing body; 20, Battery cell assembly; 21, Battery cell; 211, Housing; 212, End cap; 213, Electrode assembly; 214, Electrode terminal; 215, Pressure relief mechanism; 30, Bracket; 40, First thermal protection structure; 41, Clearance opening; 50, Second thermal protection structure; 51, First flexible high-temperature resistant layer; 52, Second flexible high-temperature resistant layer; 60, Electronic control assembly. Detailed Implementation

[0058] 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.

[0059] 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 and claims, book and foregoing description of the drawings, are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0061] 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.

[0062] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two groups).

[0064] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0067] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0068] Currently, judging from market trends, the application of power battery devices is becoming increasingly widespread. Power battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields. With the continuous expansion of the application areas of power battery devices, the market demand is also constantly increasing.

[0069] Improving battery reliability is a crucial research direction in battery technology development. A battery consists of a casing and multiple individual cells housed within it. When a cell experiences thermal runaway, it releases high-temperature, high-pressure emissions. These emissions impact the casing's cover, potentially causing it to puncture or catch fire, thus increasing the battery's risk.

[0070] Currently, some battery manufacturers have added a high-temperature resistant plate between the battery cells and the casing cover. In the event of thermal runaway in a battery cell, this plate protects the casing cover. Some current battery casing covers include a boss structure that houses high- and low-voltage components, which are supported by a bracket located below the boss structure. However, the traditional high-temperature resistant plate is placed below this bracket, meaning its installation height is lower than the bracket. This reduces the ventilation space at the top of the casing, decreasing ventilation within the casing and increasing the risk of heat diffusion and battery thermal runaway.

[0071] In view of this, embodiments of this application provide a battery device, including a housing, a battery cell assembly, a support, and a first thermal protection structure. The housing includes a cover and a body, the cover being connected to the body and forming an accommodating space. The cover includes a main body and a protrusion, the protrusion protruding in a direction away from the body. The battery cell assembly is disposed within the accommodating space, and the battery cell assembly includes a plurality of battery cells arranged sequentially. The support is disposed between the battery cell assembly and the cover, and the support is disposed opposite to the protrusion. The first thermal protection structure is disposed on the main body and is not overlapping with the support.

[0072] In the battery device provided in the above embodiments, the bracket and the boss are arranged opposite to each other, and the first thermal protection structure is located on the main body and is not overlapped with the bracket. When one or more battery cells experience thermal runaway, the battery cell discharges high-temperature and high-pressure emissions, and the emissions first impact the bracket and the first thermal protection structure. The bracket can provide thermal protection for the boss, and the first thermal protection structure can provide thermal protection for the main body, thereby reducing the risk of the lid being punctured by the emissions and the lid catching fire. At the same time, the first thermal protection structure avoids the bracket and can be directly located on the main body, solving the problem of the protective structure reducing the exhaust space at the top of the box, improving the exhaust flow of the battery device, and reducing the risk of thermal runaway of the battery device as a whole. Furthermore, since the first thermal protection structure is staggered from the bracket, the redundant design cost of the protective structure is reduced, thereby reducing the overall cost of the battery device.

[0073] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0074] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0075] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery device 100 to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0076] 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.

[0077] refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the exploded structure of a battery cell 21 provided in some embodiments of this application. Figure 3 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include multiple battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0078] In some embodiments, the battery cell assembly 20 is typically formed by arranging multiple battery cells 21; as an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0079] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed within the housing 10.

[0080] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0081] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells to the housing 10.

[0082] As an example, the housing 10 may include an upper housing and a lower housing. The upper housing and the lower housing are fastened together to form a closed receiving space inside the housing 10 to house the battery cell assembly 20. Here, "closed" means covered or closed, and can be either sealed or unsealed.

[0083] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms a closed receiving space to accommodate the battery cell assembly 20.

[0084] As an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, the top cover of the housing 10 can be at least part of the floor of the vehicle 1000, or the frame of the housing 10 can be at least part of the crossbeams and longitudinal beams of the vehicle 1000.

[0085] In some embodiments, battery device 100 refers to an energy storage device, which includes a housing 10, and at least one side of the housing 10 has a door. The energy storage device includes energy storage containers, energy storage cabinets, etc.

[0086] Please refer to Figure 2 The battery cell 21 is the smallest unit that makes up the battery device 100. The battery cell 21 includes a housing 211, an end cap 212, an electrode assembly 213, and other functional components.

[0087] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, allowing battery cell 21 to have higher structural strength and improved reliability. Functional components such as electrode terminals 214 and pressure relief mechanism 215 can be provided on end cap 212. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 for outputting or inputting electrical energy to battery cell 21. In some embodiments, pressure relief mechanism 215 is used to release internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may also be provided on the inner side of the end cap 212 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0088] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 213. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0089] Electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs. The casing 211 may contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 213, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 214 to form a current loop.

[0090] In some embodiments, a pressure relief mechanism 215 is provided on one side of the battery cell 21. The pressure relief mechanism 215 is an element or component that is actuated to release internal pressure when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold. The threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 21. The internal pressure of the battery cell 21 is the pressure inside the casing 211. The pressure relief mechanism 215 may take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and may specifically adopt a pressure-sensitive element or structure. That is, when the internal pressure of the battery cell 21 reaches the predetermined threshold, the pressure relief mechanism 215 performs an action or a weak part provided in the pressure relief mechanism 215 ruptures, thereby forming an opening or channel for releasing internal pressure.

[0091] Actuation of the pressure relief mechanism 215 refers to the action or activation of the pressure relief mechanism 215 to a certain state, thereby releasing the internal pressure of the battery cell 21. The action of the pressure relief mechanism 215 may include, but is not limited to, at least a portion of the pressure relief mechanism 215 rupturing, breaking, tearing, or opening, etc. When the pressure relief mechanism 215 is actuated, the high-temperature, high-pressure substances inside the battery cell 21 are discharged outwards from the actuated part as waste. In this way, the battery cell 21 can be depressurized under controllable pressure, thereby avoiding potentially more serious accidents. The waste from the battery cell 21 mentioned in this application includes, but is not limited to, electrolyte, dissolved or broken positive and negative electrode plates, fragments of the separator, high-temperature, high-pressure gases generated by the reaction, flames, etc.

[0092] Firstly, reference Figure 2 , Figure 4This application provides a battery device 100, including a housing 10, a battery cell assembly 20, a support 30, and a first thermal protection structure 40. The housing 10 includes a cover 11 and a body 12. The cover 11 is connected to the body 12 and forms an accommodating space 101. The cover 11 includes a main body portion 111 and a boss portion 112. The boss portion 112 protrudes in a direction away from the body 12. The battery cell assembly 20 is disposed in the accommodating space 101 and includes a plurality of battery cells 21 arranged in sequence. The support 30 is disposed between the battery cell assembly 20 and the cover 11. The support 30 is disposed opposite to the boss portion 112 and is used to support the components accommodated in the boss portion 112. The first thermal protection structure 40 is located in the accommodating space 101 and is disposed on the main body portion 111. Along the thickness direction of the cover 11, the first thermal protection structure 40 and the support 30 are not overlapped.

[0093] The housing 10 refers to the structure in the battery device 100 that provides a fixed foundation for the battery cell assembly 20. The housing 10 can be prismatic, cylindrical, or other shapes; the material of the housing 10 can include metal, plastic, or other materials. Optionally, the housing 10 is equipped with a gas balancing mechanism, which can also be called a pressure balancing mechanism. The gas balancing mechanism is set up to balance the pressure inside and outside the battery device. The gas balancing mechanism can play a role in relieving pressure when the battery device 100 experiences a fault caused by a short circuit or overcharging, releasing the gas inside the housing 10 to the outside of the housing 10, so that the battery device 100 is less likely to explode due to excessive internal pressure, thereby improving the reliability of the battery device 100.

[0094] The enclosure 10 includes a cover 11 and a body 12. The cover 11 includes a main body 111 and a boss 112. The main body 111 is the main part of the cover 11 and can be flat, frame-shaped, or other structures. The boss 112 is connected to the main body 111 and protrudes in a direction away from the body 12. Thus, the interior of the boss 112 forms a receiving groove, which can accommodate an electronic control component 60 or other components. The electronic control component 60 can be a high-voltage component, a low-voltage BMS (Battery Management System), etc. The boss 112 can be strip-shaped, square, or irregularly shaped; the area of ​​the boss 112 is smaller than the area of ​​the main body 111.

[0095] The battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially. For example, the plurality of battery cells 21 are arranged along a first direction, which may be the length direction of the housing 10. In other embodiments, the first direction may also be the width direction of the housing 10, or the first direction may be a direction that intersects both the length direction and the width direction of the housing 10.

[0096] The number of battery cell modules 20 can be one or more. When the number of battery cell modules 20 is multiple, the multiple battery cell modules 20 can be arranged in a row along the first direction, and the multiple battery cell modules 20 can also be arranged in multiple columns along the second direction intersecting the first direction, so that the battery cell modules 20 are arranged in an array.

[0097] The shape of the battery cell 21 can be cuboid, cylindrical, or other shapes; in the battery cell assembly 20, the number of battery cells 21 can be two, three or more.

[0098] After thermal runaway occurs in battery cell 21, battery cell 21 will release emissions, including high-temperature gases and substances released along with the high-temperature gases. In this application, the emissions include, but are not limited to: electrolyte, dissolved or broken positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc. Optionally, a pressure relief mechanism 215 is provided on one side of battery cell 21, and the pressure relief mechanism 215 is positioned facing the cover 11; it is understood that the pressure relief mechanism 215 may also be omitted.

[0099] The bracket 30 is used to support components housed within the boss portion 112. The bracket 30 is located between the battery cell assembly 20 and the cover 11. For example, the bracket 30 can be fixedly connected to the case body 12, such as by screws to a beam within the case body 12. It is understood that the bracket 30 can also be fixed within the case body 10 in other ways. Optionally, the orthographic projection of the bracket 30 toward the boss portion 112 falls entirely within the area of ​​the boss portion 112, so that the bracket 30 occupies less space.

[0100] The bracket 30 is disposed opposite to the boss portion 112, that is, one side of the bracket 30 faces the boss portion 112. The boss portion 112 can accommodate components such as the electronic control component 60, and the bracket 30 is used to support the electronic control component 60 and other components. Optionally, the orthographic projection of the bracket 30 onto the boss portion 112 falls entirely within the boss portion 112. In other embodiments, the orthographic projection of the bracket 30 onto the boss portion 112 may also partially extend beyond the boss portion 112.

[0101] Since the bracket 30 is located between the battery cell assembly 20 and the cover 11, in the event of thermal runaway of the battery cell 21, the bracket 30 can withstand the impact of the emissions from the battery cell 21, reducing the risk of the emissions impacting the protrusion 112, and lowering the risk of the protrusion 112 being punctured and catching fire due to heat. Optionally, the bracket 30 is a metal bracket, which has better structural strength and can better resist the impact of the emissions from the battery cell 21; in other embodiments, the bracket 30 may also be made of other materials with high structural strength.

[0102] The first thermal protection structure 40 is a structure with thermal protection function and good heat resistance. The first thermal protection structure 40 can be made of high-temperature resistant materials, such as mica sheets or high-temperature resistant films. The first thermal protection structure 40 is disposed on the main body 111, and can be fixedly connected to the main body 111 or integrally formed with the main body 111. The first thermal protection structure 40 can provide thermal protection for the main body 111. When the battery cell 21 experiences thermal runaway, the first thermal protection structure 40 can resist the impact of emissions, reducing the risk of the main body 111 being punctured or catching fire due to heat.

[0103] Along the thickness direction of the box cover 11 ( Figure 4 In the Z-direction, the first thermal protection structure 40 and the bracket 30 are not overlapped; that is, the first thermal protection structure 40 avoids the bracket 30 and is staggered. Thus, the first thermal protection structure 40 and the bracket 30 provide thermal protection for different parts of the cover 11. Specifically, the protrusion 112 of the cover 11 is protected by the bracket 30, and the main body 111 of the cover 11 is protected by the first thermal protection structure 40, reducing redundant design and cost of protective materials. Simultaneously, because the first thermal protection structure 40 and the bracket 30 are not overlapped, the first thermal protection structure 40 can be directly mounted on the main body 111 without reducing the installation height to avoid the bracket 30. Optionally, to improve the protective effect on the cover 11, the first thermal protection structure 40 and the bracket 30 together cover each battery cell assembly 20 inside the casing 10.

[0104] In the battery device 100 provided in the above embodiment, the bracket 30 and the boss portion 112 are arranged opposite to each other, and the first thermal protection structure 40 is provided on the main body portion 111. When one or more battery cells 21 experience thermal runaway, the battery cell 21 discharges high-temperature and high-pressure emissions. The emissions impact the bracket 30 and the first thermal protection structure 40. The bracket 30 can provide thermal protection for the boss portion 112, and the first thermal protection structure 40 provides thermal protection for the main body portion 111, thereby reducing the risk of the cover 11 being punctured by the emissions and the cover 11 catching fire. At the same time, the first thermal protection structure 40 and the bracket 30... The non-overlapping arrangement means that the first thermal protection structure 40 avoids the bracket 30 and can be directly installed on the main body 111. This solves the problem of the low installation height of the protective structure causing the exhaust space at the top of the housing 10 to be reduced, improves the exhaust flow of the battery device 100, reduces the risk of heat diffusion and the risk of thermal runaway of the battery device 100 as a whole, and improves the reliability of the battery device 100. Furthermore, since the first thermal protection structure 40 is staggered from the bracket 30, the redundant design cost of the protective structure is reduced, thereby reducing the overall cost of the battery device 100.

[0105] Please refer to Figure 4In the first embodiment, the first thermal protection structure 40 is connected to the surface of the main body 111 facing the box body 12, and the first thermal protection structure 40 has a clearance opening 41 for avoiding the support 30.

[0106] The first thermal protection structure 40 can be connected to the surface of the main body 111 by means of adhesive, locking, snap-fit, etc. In this way, the emissions from the battery cell 21 first impact the first thermal protection structure 40, and the first thermal protection structure 40 can protect the main body 111. Compared with fixing the first thermal protection structure 40 to the top of the lower casing 10, the solution provided in this application embodiment can improve the ventilation of the top of the casing 10.

[0107] The first thermal protection structure 40 has an avoidance opening 41. The first thermal protection structure 40 does not require a single high-temperature resistant plate design; it can both protect the lid and avoid the support 30 through the avoidance opening 41. For example... Figure 4 As shown, the bracket 30 is at least partially disposed within the clearance opening 41, thus allowing the first thermal protection structure 40 to be disposed without overlapping with the bracket 30. If the installation height of the bracket 30 is lower than the installation height of the first thermal protection structure 40, the bracket 30 may also be disposed opposite to the clearance opening 41.

[0108] In some embodiments, along the thickness direction (Z direction) of the cover 11, the orthographic projection of the bracket 30 toward the cover 11 falls within the orthographic projection of the clearance opening 41 toward the cover 11.

[0109] By adopting the above technical solution, the first thermal protection structure 40 is fixedly connected to the surface of the main body 111, and the clearance opening 41 of the first thermal protection structure 40 can avoid the bracket 30. In this way, the installation height of the first thermal protection structure 40 is not affected by the bracket 30, which improves the ventilation of the top of the box 10, reduces the risk of heat diffusion caused by poor ventilation, and improves the reliability of the battery device 100.

[0110] In some embodiments, the first thermal protection structure 40 is attached to the surface of the main body 111.

[0111] Since the bracket 30 avoids the obstruction opening 41, the first thermal protection structure 40 can be directly fixed to the surface of the main body 111. In this embodiment, the first thermal protection structure 40 is adhered to the surface of the main body 111 with adhesive, which not only fixes the first thermal protection structure 40 to the main body 111 but also ensures that the first thermal protection structure 40 is in close contact with the main body 111, reducing the risk of the protective structure obstructing the flow of emissions. Furthermore, the first thermal protection structure 40 does not require the use of screws or other fasteners for fixation, further saving on protection costs.

[0112] In some embodiments, the first thermal protection structure 40 is hollowed out at the boss portion 112 to form an avoidance opening 41, or the first thermal protection structure 40 includes a plurality of protective portions, the plurality of protective portions being fixedly connected to the main body portion 111 respectively, and at least two protective portions being spaced apart at the boss portion 112 to form an avoidance opening 41.

[0113] The first thermal protection structure 40 can be an integral structure. The first thermal protection structure 40 has a hollowed-out opening 41 at the position of the corresponding boss 112. Along the direction perpendicular to the cover 11, the orthographic projection of the bracket 30 on the cover 11 falls inside the orthographic projection of the opening 41 on the cover 11, so that the first thermal protection structure 40 can avoid the bracket 30.

[0114] The first thermal protection structure 40 can also be a split structure, comprising multiple protective parts, each fixedly connected to the main body 111. For example, each protective part is individually adhered to the surface of the main body 111, meaning the first thermal protection structure 40 comprises multiple protective parts segmented and adhered to the main body 111. Two adjacent protective parts can be connected or spaced apart, with at least two adjacent protective parts spaced apart at the protrusion 112 to form a clearance opening 41. It is understood that if the surface of the main body 111 has a protruding beam, two adjacent protective parts can be spaced apart to avoid the beam.

[0115] By adopting the above technical solution, the first thermal protection structure 40 can be an integral structure or a split structure. The first thermal protection structure 40 can be flexibly set to adapt to the structure of the box cover 11.

[0116] Please refer to Figure 2 and Figure 4 In some embodiments, the battery device 100 further includes an electronic control component 60, which is disposed on the bracket 30 and housed within the boss portion 112.

[0117] The battery unit 100 is assembled in electrical devices such as the vehicle 1000. Taking the vehicle 1000 as an example, due to the space constraints of the entire vehicle, the battery cover 11 needs to be designed as an irregular structure including a boss portion 112. In order to improve the battery energy density, the electronic control component 60 can be housed in the boss portion 112 and supported by the bracket 30. The electronic control component 60 can be a high-voltage component, a low-voltage BMS component, etc.

[0118] By setting the electronic control component 60 inside the boss portion 112, the space inside the boss portion 112 can be effectively utilized, which is beneficial to improving the energy density of the battery. Furthermore, the bracket 30 can support the electronic control component 60. In the event of thermal runaway of the battery cell 21, the bracket 30 can withstand the impact of the emissions released by the battery cell 21, thus providing thermal protection for both the electronic control component 60 and the boss portion 112.

[0119] Please refer to Figures 2 to 4 In some embodiments, the battery cell 21 has a pressure relief mechanism 215, which is located on the side of the battery cell 21 facing the cover 11; along the thickness direction of the cover 11, the first thermal protection structure 40 overlaps with a plurality of battery cells 21, and the bracket 30 overlaps with at least one battery cell 21.

[0120] The pressure relief mechanism 215 is a component or part that is activated to release internal pressure when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold. When the pressure relief mechanism 215 is activated, the high-temperature and high-pressure substances inside the battery cell 21 are discharged outward from the actuating part. An exhaust space is formed between the side of the battery cell 21 equipped with the pressure relief mechanism 215 and the cover 11. When the air pressure inside the housing 10 exceeds the threshold, the exhaust can be discharged from the pressure relief valve or air pressure balance valve on the side of the housing 10.

[0121] Along the thickness direction of the cover 11, the bracket 30 overlaps with at least one battery cell 21. Similarly, the boss portion 112 also overlaps with at least one battery cell 21. The first thermal protection structure 40 overlaps with multiple battery cells 21. Optionally, the first thermal protection structure 40 and the bracket 30 can cover all battery cells 21 to provide thermal protection for the entire cover 11.

[0122] By adopting the above technical solution, when the pressure relief mechanism 215 is activated, the emissions discharged by the battery cell 21 will flow toward the cover 11. The first thermal protection structure 40 and the bracket 30 can prevent the emissions from directly impacting the cover 11, reducing the risk of damage to the cover 11 and fire, and improving the reliability of the battery device 100.

[0123] like Figure 4 As shown, in some embodiments, along the thickness direction of the cover 11, the distance from the surface of the first thermal protection structure 40 away from the cover 11 to the battery cell assembly 20 is greater than the distance from the surface of the bracket 30 away from the cover 11 to the battery cell assembly 20.

[0124] like Figure 4 As shown, the distance from the surface of the first thermal protection structure 40 away from the cover 11 to the battery cell assembly 20 is H1, and the distance from the surface of the bracket 30 away from the cover 11 to the battery cell assembly 20 is H2, where H1 is greater than H2. It can be understood that when the cover 11 serves as the top cover of the battery device 100, the installation height of the first thermal protection structure 40 is higher than the installation height of the bracket 30.

[0125] Since the first thermal protection structure 40 can avoid the bracket 30, the first thermal protection structure 40 can be connected to the main body 111 without placing the first thermal protection structure 40 below the bracket 30. This increases the exhaust space between the battery cell assembly 20 and the first thermal protection structure 40, which is conducive to the smooth flow of emissions within the housing 10 and reduces the risk of thermal diffusion.

[0126] In some embodiments, the first thermal protection structure 40 is a mica plate or a flexible high-temperature resistant layer.

[0127] Mica is a high-performance insulating material, mainly made from processed mica minerals. Mica sheets possess excellent high-temperature resistance, electrical insulation, and thermal insulation properties, as well as high mechanical strength. Mica sheets can withstand high-temperature use without easily melting or deforming. When thermal runaway of the battery cell 21 generates high-temperature emissions, the mica sheet effectively protects the cover 11, reducing the risk of the cover 11 catching fire or being punctured.

[0128] The flexible high-temperature resistant layer is flexible and can withstand high temperatures. The flexible high-temperature resistant layer can be flexible mica paper or other flexible high-temperature resistant materials.

[0129] The first thermal protection structure 40 can be a rigid mica board or a flexible high-temperature resistant layer, depending on the material or thickness of the cover 11, in order to achieve a good thermal protection effect.

[0130] In some embodiments, the box cover 11 is a metal box cover, and the first thermal protection structure 40 is a mica plate.

[0131] The lid 11 is a metal lid, which can be a sheet metal lid, such as a lid made of steel plate, aluminum plate, copper plate, etc. When the lid 11 is a metal lid, there is a risk of combustion at high temperatures. In this case, a mica plate is installed on the main body 111, which can not only resist impact, but also reduce the risk of combustion of the lid 11.

[0132] By adopting the above technical solutions, mica sheets can improve the impact resistance of metal box covers, and mica sheets can also improve the heat resistance of metal box covers, thus providing good thermal protection for metal box covers.

[0133] Furthermore, such as Figure 4 and Figure 5 As shown, the first thermal protection structure 40 can be a mica plate with a thickness of 1mm to 2mm.

[0134] The thickness D1 of the first thermal protection structure 40 can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc.

[0135] By setting the first thermal protection structure 40 to be greater than or equal to 1mm, the first thermal protection structure 40 can provide good impact protection for the metal box cover; by setting the first thermal protection structure 40 to be less than or equal to 2mm, the first thermal protection structure 40 is lighter in weight and can be easily attached to the main body 111. At the same time, the first thermal protection structure 40 occupies less space and has less impact on the flow of flue gas inside the box 10.

[0136] In other embodiments, the lid 11 may also be made of composite material or other materials, and the first thermal protection structure 40 may also be made of flexible mica paper or other high-temperature resistant components.

[0137] Please refer to Figures 4 to 7 In some embodiments, the battery device 100 further includes a second thermal protection structure 50, which is disposed on at least one of the bracket 30 and the boss portion 112.

[0138] like Figure 4 As shown, in the first embodiment, the second thermal protection structure 50 is simultaneously provided on the surfaces of both the bracket 30 and the boss portion 112. Figure 6 As shown, in the second embodiment, the second thermal protection structure 50 is disposed on the surface of the boss portion 112 and is disposed opposite to the bracket 30. In another embodiment, the second thermal protection structure 50 is disposed on the bracket 30, and the second thermal protection structure 50 is located on the surface of the bracket 30 away from the boss portion 112.

[0139] Optionally, the edge of the main body 111 and the bracket 30 has a gap, and the projection of the second thermal protection structure 50 on the cover 11 at least partially coincides with the projection of the gap on the cover 11. In this way, if the discharged material impacts the boss 112 through the gap, the second thermal protection structure 50 can protect the boss 112.

[0140] The second thermal protection structure 50 can be set according to the material and thickness of the bracket 30 and the material and thickness of the cover 11 to protect the cover 11. The second thermal protection structure 50 can work together with the bracket 30 to protect the boss part 112, further reducing the risk of the boss part 112 being punctured, burning and catching fire.

[0141] Please refer to Figures 4 to 6 In some embodiments, the second thermal protection structure 50 includes a first flexible high-temperature resistant layer 51, which is attached to the surface of the boss portion 112 facing the receiving space 101.

[0142] The first flexible high-temperature resistant layer 51 is made of a flexible, high-temperature resistant material, which can not only provide heat protection but also be easily attached to the surface of the boss portion 112. The surface of the boss portion 112 facing the receiving space 101 is the inner surface of the boss portion 112. The first flexible high-temperature resistant layer 51 can be attached to the inner surface of the boss portion 112 with an adhesive, which is convenient for manufacturing.

[0143] By attaching a first flexible high-temperature resistant layer 51 to the surface of the boss portion 112, the first flexible high-temperature resistant layer 51 and the bracket 30 provide dual protection for the boss portion 112. Even if high-temperature emissions break through the bracket 30, the first flexible high-temperature resistant layer 51 can still protect the boss portion 112, reducing the risk of the boss portion 112 being broken or catching fire.

[0144] In some embodiments, the first flexible high-temperature resistant layer 51 is mica paper, and the thickness of the first flexible high-temperature resistant layer 51 is less than or equal to 1 mm.

[0145] Mica paper is a mica product made from crushed mica or mica powder through processes such as pulping, papermaking, forming, and pressing. It can replace natural mica flakes as an industrial electrical insulation material. Mica paper has good heat resistance, remains stable at high temperatures, and is not easily combustible. Figure 5 As shown, the thickness D2 of the first flexible high-temperature resistant layer 51 can be 0.2mm, 0.5mm, 0.8mm, 1mm, etc.

[0146] By adopting the above technical solution, the first flexible high-temperature resistant layer 51 can improve the heat resistance of the boss portion 112 and reduce the risk of fire and combustion of the boss portion 112; the thickness of the first flexible high-temperature resistant layer 51 is less than or equal to 1 mm, and it can fit well into the surface of the boss portion 112.

[0147] Please refer to Figure 4 and Figure 5 In some embodiments, the boss portion 112 includes a boss top wall 1121 and a boss side wall 1122, the boss side wall 1122 being connected between the main body portion 111 and the boss top wall 1121; the first flexible high temperature resistant layer 51 is at least attached to the boss side wall 1122, and along the thickness direction of the cover 11, the first flexible high temperature resistant layer 51 is at least overlapping the edge of the bracket 30.

[0148] The top wall 1121 of the boss can be a flat plate structure, and it can be arranged parallel to the main body 111, but is not limited thereto. The side wall 1122 of the boss is connected to the periphery of the top wall 1121, and one end of the side wall 1122 away from the top wall 1121 is connected to the main body 111. Optionally, the side wall 1122 of the boss includes a first section and a second section. The first section is vertically connected to the main body 111, and the second section is obliquely connected between the first section and the top wall 1121. The thickness of both the first section and the second section is configured as a thickened portion 1123.

[0149] The first flexible high-temperature resistant layer 51 is at least attached to the sidewall 1122 of the boss. For example... Figure 4 As shown, in some embodiments, the first flexible high-temperature resistant layer 51 overlaps at least with the edge of the bracket 30 along the thickness direction of the cover 11. That is, along the thickness direction of the cover 11, at least the orthographic projection of the edge of the bracket 30 toward the boss 112 coincides with the orthographic projection of the first flexible high-temperature resistant layer 51 toward the boss 112. Optionally, the first flexible high-temperature resistant layer 51 is not overlapped with the middle of the bracket 30, and the first flexible high-temperature resistant layer 51 does not cover or does not completely cover the top wall 1121 of the boss, so as to reduce the area of ​​the first flexible high-temperature resistant layer 51 and thus reduce the cost of thermal protection. In other embodiments, the first flexible high-temperature resistant layer 51 may also overlap with the entire bracket 30.

[0150] By adopting the above technical solution, the first flexible high-temperature resistant layer 51 is at least overlapped with the edge of the bracket 30. Even if the emissions generated by the battery cell 21 flow from the edge of the bracket 30 toward the protrusion 112, the first flexible high-temperature resistant layer 51 can still provide thermal protection for the protrusion 112, further improving the reliability of the battery device 100.

[0151] Please refer to Figure 4 and Figure 5 In some embodiments, the first flexible high-temperature resistant layer 51 extends from the boss sidewall 1122 to the main body 111, and the first flexible high-temperature resistant layer 51 partially overlaps with the first thermal protection structure 40.

[0152] During manufacturing, the first flexible high-temperature resistant layer 51 can be attached first, or the first thermal protection structure 40 can be attached first.

[0153] The first flexible high-temperature resistant layer 51 is attached to the side wall 1122 of the boss, and the edge of the first flexible high-temperature resistant layer 51 extends to the main body 111 and partially overlaps with the first thermal protection structure 40. This can not only increase the bonding area and bonding strength between the first flexible high-temperature resistant layer 51 and the cover 11, but also improve the thermal protection effect of the edge of the boss 112.

[0154] Please refer to Figure 4In some embodiments, the second thermal protection structure 50 includes a second flexible high-temperature resistant layer 52, which is attached to the surface of the support 30 facing the battery cell assembly 20.

[0155] The second flexible high-temperature resistant layer 52 can improve the high-temperature resistance of the bracket 30, reduce the risk of the bracket 30 being melted through, and thus reduce the impact of emissions on the boss. The second flexible high-temperature resistant layer 52 is made of flexible and high-temperature resistant material, which can not only play a role in heat protection, but also be easily attached to the surface of the bracket 30.

[0156] Optionally, the support 30 is an aluminum support. After thermal runaway of the battery cell 21, the aluminum support 30 can withstand most of the impact and heat. In some cases, the aluminum support 30 may be melted through. Therefore, in this embodiment, a second flexible high-temperature resistant layer 52 is attached below the support 30. The second flexible high-temperature resistant layer 52 can remain stable at high temperatures and is not easy to melt through, reducing the risk of the support 30 being melted through.

[0157] In some embodiments, the second flexible high-temperature resistant layer 52 is mica paper, and the thickness of the second flexible high-temperature resistant layer 52 is less than or equal to 0.35 mm.

[0158] Because the support 30 itself has high structural strength, the second flexible high-temperature resistant layer 52 can be made of mica paper, which has good flexibility. The thickness of the second flexible high-temperature resistant layer 52 is less than the thickness of the first thermal protection structure 40, such as... Figure 4 As shown, the thickness D3 of the second flexible high-temperature resistant layer 52 is less than or equal to 0.35 mm. For example, the thickness of the second flexible high-temperature resistant layer 52 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.35 mm, etc.

[0159] By adopting the above technical solution, the second flexible high-temperature resistant layer 52 is mica paper, which is easy to attach to the surface of the bracket 30; the thickness of the second flexible high-temperature resistant layer 52 is less than or equal to 0.35mm, which can reduce the occupation of the exhaust space and facilitate the rapid discharge of exhaust materials from the housing 10.

[0160] In other embodiments, the second flexible high-temperature resistant layer 52 may also be replaced with a mica plate.

[0161] In some other embodiments, the second flexible high-temperature resistant layer 52 may be omitted. For example, the support 30 may be a steel support 30, which has strong impact resistance and is not easily melted through.

[0162] Please refer to Figures 4 to 6 In the first and second embodiments, a first flexible high-temperature resistant layer 51 is attached to the surface of the boss portion 112, and the cover 11 can be made of sheet metal. The first flexible high-temperature resistant layer 51 can reduce the risk of the cover 11 burning and melting through.

[0163] Please refer to Figure 7 and Figure 8 In the third and fourth embodiments, the lid 11 is a composite lid, which can be made of a heat-diffusion-resistant composite material. Compared with a sheet metal lid 11, the composite lid has better high-temperature resistance. The material of the composite lid can be a resin composite material, such as glass fiber reinforced phenolic resin, high-silica cloth reinforced phenolic resin, basalt fiber reinforced phenolic resin, or carbon fiber cloth reinforced phenolic resin, etc.

[0164] like Figure 7 As shown, in the third embodiment, the box cover 11 is a composite box cover made of composite material, the boss portion 112 has a thickened portion 1123, the thickness of the thickened portion 1123 is greater than the thickness of the main body portion 111, and the thickened portion 1123 is at least overlapped with the edge of the bracket 30.

[0165] Specifically, the first thermal protection structure 40 is attached to the main body 111. The first thermal protection structure 40 can be a thermal protection structure such as a mica plate. The first thermal protection structure 40 is not overlapped with the bracket 30. The boss portion 111 includes a boss top wall 1121 and a boss side wall 1122. The boss side wall 1122 is configured as a thickened portion 1123, or both the boss side wall 1122 and at least a portion of the boss top wall 1121 are configured as thickened portions 1123. Optionally, the boss side wall 1122 includes a first section and a second section. The first section is vertically connected to the main body 111, and the second section is obliquely connected between the first section and the boss top wall 1121. The thickness of both the first section and the second section is configured as thickened portions 1123.

[0166] Optionally, the edge of the main body 111 and the bracket 30 has a gap, and the projection of the thickened part 1123 on the lid 11 at least partially coincides with the projection of the gap on the lid 11.

[0167] Optionally, the bracket 30 can be made of steel, which makes it less susceptible to being punctured, and the second flexible high-temperature resistant layer 52 can be omitted. Of course, the bracket 30 can also be made of aluminum or other materials. When the bracket 30 is made of aluminum, the second flexible high-temperature resistant layer 52 can be attached to the bottom of the bracket 30.

[0168] By adopting the above technical solution, the cover 11 is a composite cover. The cover 11 itself has good thermal shock resistance and is not easy to burn. At the same time, by setting the boss portion 112 with a thickened portion 1123 and making the thickened portion 1123 overlap with at least the edge of the support 30, the impact resistance of the boss portion 112 can be improved. Even if the exhaust flows from the edge of the support 30 to the boss portion 112, the boss portion 112 is not easy to be punctured or catch fire.

[0169] In some embodiments, the thickness D4 of the thickened portion 1123 is 3mm to 5mm. For example, the thickness of the thickened portion 1123 may be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0170] The thickness of the thickened part 1123 is greater than or equal to 3mm, which makes the thickened part 1123 have better impact resistance; the thickness of the thickened part 1123 is less than or equal to 5mm, which can prevent the weight of the box cover 11 from being too large.

[0171] In some embodiments, the thickness of the main body 111 may be 1 to 1.5 mm, for example, the thickness of the main body 111 may be 1.2 mm. Thus, the thickness of the thickened portion 1123 is more than twice the thickness of the main body 111, which significantly improves the impact resistance of the boss portion 112.

[0172] Please refer to Figure 8 In the fourth embodiment, the cover 11 is a composite cover, the thickness D5 of the main body 111 is greater than or equal to 3mm, and a portion of the main body 111 near the battery cell assembly 20 is formed as a first thermal protection structure 40.

[0173] For ease of understanding, Figure 8 The portion below the dotted line is the first thermal protection structure 40. The first thermal protection structure 40 can be regarded as a thickened structure on the main body 111, making the overall thickness of the main body 111 greater than the thickness of a conventional composite box cover. Optionally, the thickness D5 of the main body 111 is 3mm to 5mm. In this way, the first thermal protection structure 40 can also improve the impact resistance and heat resistance of the main body 111.

[0174] In the fourth embodiment, both the main body 111 and the boss 112 are thickened, and the thickness of the cover 11 in both the main body 111 and the boss 112 is greater than or equal to 3mm. Optionally, the thickness of the cover 11 in both the main body 111 and the boss 112 is less than or equal to 5mm.

[0175] By adopting the above technical solution, the bracket 30 can protect the boss 112. At the same time, the cover 11 itself has good thermal protection performance, eliminating the need to set a high-temperature resistant plate under the bracket 30. This solves the problems of the high-temperature resistant plate affecting the exhaust space and the redundancy of the protective structure.

[0176] Please refer to the following at the same time Figures 2 to 8Some embodiments of this application provide a battery device 100, including a housing 10, a battery cell assembly 20, a support 30, and a first thermal protection structure 40. The housing 10 includes a cover 11 and a body 12, the cover 11 being connected to the body 12 and forming an accommodating space 101. The cover 11 includes a main body portion 111 and a boss portion 112, the boss portion 112 protruding in a direction away from the body 12. The battery cell assembly 20 is disposed within the accommodating space, and the battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially. The support 30 is disposed between the battery cell assembly 20 and the cover 11, and the support 30 is disposed opposite to the boss portion 112. The first thermal protection structure 40 is disposed on the main body portion 111. Along the thickness direction of the cover 11, the first thermal protection structure 40 and the support 30 are not overlapped. The first thermal protection structure 40 is connected to the surface of the main body portion 111 facing the body 12, or the first thermal protection structure 40 is integrally formed with the main body portion 111. Optionally, the battery device 100 may further include a second thermal protection structure 50, which is disposed on at least one of the bracket 30 and the boss portion 112.

[0177] like Figure 4 As shown, in the first embodiment, the bracket 30 can be an aluminum bracket 30, and the box cover 11 can be a sheet metal box cover. The second thermal protection structure 50 includes a first flexible high-temperature resistant layer 51 and a second flexible high-temperature resistant layer 52. The first flexible high-temperature resistant layer 51 is attached to the surface of the boss portion 112, and the second flexible high-temperature resistant layer 52 is attached to the surface of the bracket 30.

[0178] like Figure 6 As shown, in the second embodiment, the bracket 30 can be a steel bracket 30, and the box cover 11 can be a sheet metal box cover. The second thermal protection structure 50 includes a first flexible high-temperature resistant layer 51, which is attached to the surface of the boss portion 112.

[0179] like Figure 7 As shown, in the third embodiment, the box cover 11 can be a composite box cover, the boss portion 112 has a thickened portion 1123, and the second heat protection structure 50 can be omitted.

[0180] like Figure 8 As shown, in the fourth embodiment, the box cover 11 can be a composite box cover, and the first heat protection structure 40 does not need to use mica plate. The first heat protection structure 40 is directly integrally formed with the main body 111.

[0181] Secondly, some embodiments of this application also provide an electrical device, including a battery device 100 provided in some embodiments of the first aspect, the battery device 100 being used to store or provide electrical energy.

[0182] Electrical devices can be vehicles (1000), or mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, ships, spacecraft, etc.

[0183] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: The box includes a lid and a body, the lid being connected to the body and forming an accommodating space, the lid including a main body and a boss, the boss protruding in a direction away from the body; A battery cell assembly is disposed within the accommodating space, and the battery cell assembly includes multiple battery cells; A bracket is disposed between the battery cell assembly and the box cover. The bracket is disposed opposite to the boss portion and is used to support the component housed in the boss portion. A first thermal protection structure is located within the accommodating space, and the first thermal protection structure is disposed on the main body. Along the thickness direction of the box cover, the first thermal protection structure is arranged without overlapping the bracket.

2. The battery device as claimed in claim 1, characterized in that, The first thermal protection structure is connected to the surface of the main body facing the box body, and the first thermal protection structure has a clearance opening for avoiding the support.

3. The battery device as claimed in claim 2, characterized in that, The first heat protection structure is attached to the surface of the main body.

4. The battery device as claimed in claim 2, characterized in that, The first thermal protection structure is hollowed out at the boss portion to form the clearance opening, or, The first thermal protection structure includes multiple protective parts, which are fixedly connected to the main body, and at least two of the protective parts are spaced apart at the boss to form the clearance opening.

5. The battery device as claimed in claim 1, characterized in that, The battery device also includes an electronic control component, which is disposed on the bracket and housed within the boss portion.

6. The battery device as claimed in claim 1, characterized in that, The battery cell has a pressure relief mechanism, which is located on the side of the battery cell facing the cover. Along the thickness direction of the cover, the first thermal protection structure overlaps with a plurality of the battery cells, and the bracket overlaps with at least one of the battery cells.

7. The battery device according to any one of claims 1-6, characterized in that, Along the thickness direction of the cover, the distance from the surface of the first thermal protection structure away from the cover to the battery cell assembly is greater than the distance from the surface of the bracket away from the cover to the battery cell assembly.

8. The battery device according to any one of claims 1-6, characterized in that, The first thermal protection structure is a mica plate or a flexible high-temperature resistant layer.

9. The battery device as claimed in claim 8, characterized in that, The box cover is a metal box cover, and the first heat protection structure is a mica plate.

10. The battery device as claimed in claim 9, characterized in that, The first thermal protection structure is a mica plate with a thickness of 1mm to 2mm.

11. The battery device according to any one of claims 1-10, characterized in that, The battery device further includes a second thermal protection structure, which is disposed on at least one of the bracket and the boss portion.

12. The battery device as claimed in claim 11, characterized in that, The second thermal protection structure includes a first flexible high-temperature resistant layer, which is attached to the surface of the protrusion facing the receiving space.

13. The battery device as claimed in claim 12, characterized in that, The first flexible high-temperature resistant layer is mica paper, and the thickness of the first flexible high-temperature resistant layer is less than or equal to 1 mm.

14. The battery device as claimed in claim 13, characterized in that, The boss portion includes a boss top wall and a boss side wall, the boss side wall being connected between the main body portion and the boss top wall; the first flexible high-temperature resistant layer is at least attached to the boss side wall, and along the thickness direction of the box cover, the first flexible high-temperature resistant layer is at least overlapping the edge of the bracket.

15. The battery device as claimed in claim 14, characterized in that, The first flexible high-temperature resistant layer extends from the sidewall of the boss to the main body, and the first flexible high-temperature resistant layer partially overlaps with the first thermal protection structure.

16. The battery device as claimed in claim 11, characterized in that, The second thermal protection structure includes a second flexible high-temperature resistant layer, which is attached to the surface of the bracket facing the battery cell assembly.

17. The battery device as claimed in claim 16, characterized in that, The second flexible high-temperature resistant layer is mica paper, and the thickness of the second flexible high-temperature resistant layer is less than or equal to 0.35 mm.

18. The battery device according to any one of claims 1-10, characterized in that, The lid is a composite lid made of composite materials. The protrusion has a thickened part, the thickness of which is greater than the thickness of the main body. The thickened part overlaps at least with the edge of the bracket.

19. The battery device as claimed in claim 18, characterized in that, The thickness of the thickened part is 3mm to 5mm.

20. The battery device according to any one of claims 1-6, characterized in that, The cover is a composite cover made of composite materials, the thickness of the main body is greater than or equal to 3mm, and a portion of the main body near the battery cell assembly forms the first thermal protection structure.

21. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-20, the battery device being used to store or provide electrical energy.

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