Battery device, electric device, and energy storage device

Abstract

Disclosed in the present disclosure are a battery device, an electric device, and an energy storage device. The battery device comprises: at least one battery cell, wherein the battery cell has a pressure relief structure, and a pressure relief port of the pressure relief structure faces a first direction; and at least one fire extinguishing assembly, wherein each fire extinguishing assembly is arranged opposite to the pressure relief structure in the first direction, the fire extinguishing assembly comprises a fire extinguishing agent layer and a protective net having an accommodating cavity, and the fire extinguishing agent layer is accommodated in the accommodating cavity of the protective net. The battery device has enhanced flame impact resistance.

Description

Battery devices, electrical devices and energy storage devices Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to battery devices, power consumption devices and energy storage devices. Background Technology

[0002] Battery devices are widely used in the new energy field, and the development of battery technology is crucial to the development of new energy technologies. However, the safety of battery devices is a critical issue that cannot be avoided in the development of battery technology. In battery devices, when a single cell experiences thermal runaway, the pressure relief structure releases excessive pressure within the cell to prevent it from exploding. However, the flames and sparks ejected during the pressure relief process can have negative impacts on the battery device. Summary of the Invention

[0003] To address the aforementioned technical problems, this disclosure provides a battery device, a power-consuming device, and an energy storage device. The battery device exhibits enhanced resistance to flame impact. This disclosure is achieved through the following technical solutions.

[0004] A first aspect of this disclosure provides a battery device, comprising: at least one battery cell having a pressure relief structure with the pressure relief port facing a first direction; and at least one fire extinguishing assembly, each fire extinguishing assembly being disposed opposite to the pressure relief structure along the first direction, the fire extinguishing assembly including a fire extinguishing agent layer and a protective net having a receiving cavity, the fire extinguishing agent layer being received within the receiving cavity of the protective net.

[0005] In this disclosure, a fire extinguishing component is installed at a relative position to the pressure relief structure in a first direction. When the battery device experiences thermal runaway, flames and sparks ejected through the pressure relief structure can contact the fire extinguishing component. The fire extinguishing component consists of a protective mesh and a layer of extinguishing agent disposed inside the protective mesh. Flames and sparks can penetrate the protective mesh and directly contact the extinguishing agent layer, allowing the extinguishing agent layer to extinguish the flames, thereby reducing damage to the battery device's casing from the flames.

[0006] In some embodiments, the melting point of the protective mesh is in the range of 800°C to 3500°C. By selecting a protective mesh with a melting point in the above range, it is beneficial to maintain the structural stability of the protective mesh in the event of thermal runaway of a battery cell. This allows the internal fire extinguishing agent layer to fully exert its fire extinguishing function, reduces the risk of larger-scale thermal runaway caused by flames, and prevents the enclosure from becoming too hot to perform its load-bearing function or even melting through.

[0007] In some embodiments, the melting point of the protective mesh is in the range of 1200°C to 3500°C. By selecting a protective mesh with a melting point within this range, higher reliability is provided for the battery device, making it suitable for high-temperature environments and applications with higher performance requirements.

[0008] In some embodiments, the mesh area of ​​the protective netting is 0.01 mm. 2 Up to 1mm 2 This allows for better control of the fire extinguishing agent layer, as flames and sparks can pass through the mesh more easily and contact the extinguishing agent layer in the event of thermal runaway in the battery unit, thus improving extinguishing efficiency. Furthermore, it reduces the possibility of extinguishing agent leakage from the mesh, thereby minimizing contamination of the internal environment of the battery unit.

[0009] In some embodiments, the protective netting is made of at least one of titanium, gold, platinum, iron, cobalt, nickel, manganese, silver, copper, and tungsten. These materials have high hardness and high melting points. By selecting a protective netting containing these materials, the netting can maintain its structural integrity even when in contact with flames, providing reliable protection for the extinguishing agent layer. This allows the extinguishing agent layer to fully exert its extinguishing function, reducing the risk of larger-scale thermal runaway caused by flames and preventing the enclosure from overheating and failing to perform its load-bearing function, or even melting through.

[0010] In some embodiments, an insulating layer is provided on the surface of the protective mesh. This design allows the protective mesh to isolate individual battery cells from the battery pack housing, reducing the risk of short circuits.

[0011] In some embodiments, the insulating layer is made of at least one of epoxy resin and polyimide. These materials can be electrophoretically loaded onto the surface of the protective mesh to form an insulating layer, thereby ensuring that the insulating layer is evenly distributed across every corner of the protective mesh, thus improving the insulation performance of the protective mesh and reducing the risk of short circuits in the battery device.

[0012] In some embodiments, the thickness of the insulating layer is in the range of 30 μm to 80 μm. With the above configuration, the insulating layer can provide sufficient insulation performance, thereby reducing the risk of short circuits in the battery device.

[0013] In some embodiments, under test conditions where a 1000V DC voltage is continuously applied to the protective mesh for 60 seconds, the insulation resistance of the protective mesh is in the range of 500MΩ to 99GΩ. This helps to further reduce the risk of short circuits in the battery device.

[0014] In some embodiments, under a test condition where a 2700V DC voltage is continuously applied to the protective mesh for 60 seconds, the withstand voltage leakage current of the protective mesh remains within the range of 0mA to 1mA. This helps to further reduce the risk of short circuits in the battery device. In some embodiments, the fire extinguishing assembly further includes: an encapsulation component; the encapsulation component is disposed within a receiving cavity and encapsulates the fire extinguishing agent layer. This design prevents the loss of fire extinguishing material, facilitates the full utilization of the fire extinguishing agent layer's fire extinguishing function, reduces the risk of large-scale thermal runaway caused by flames, and prevents the housing from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0015] In some embodiments, the melting point of the package is in the range of 160°C to 600°C. Packages with melting points in this range can respond rapidly to high temperatures upon initial contact with flames, promptly melting and releasing the internal extinguishing agent, thereby effectively suppressing the spread of fire, reducing the risk of larger-scale thermal runaway caused by flames, and preventing the enclosure from becoming too hot to perform its load-bearing function or even melting through.

[0016] In some embodiments, the encapsulation includes at least one resin layer and an aluminum foil stacked with the resin layer. The aluminum foil has good mechanical strength, toughness, and density. When stacked with the resin layer, it can form a high-mechanical-strength and high-density encapsulation space, which helps reduce the loss of the encapsulated fire extinguishing material inside, allows the fire extinguishing agent layer to fully exert its fire extinguishing function, reduces the risk of large-scale thermal runaway caused by flames, and prevents the enclosure from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0017] In some embodiments, at least one resin layer includes a first resin layer and a second resin layer, with an aluminum foil disposed between the first resin layer and the second resin layer. By disposing the aluminum foil between the first resin layer and the second resin layer, the first resin layer and the second resin layer together provide protection for the aluminum foil, effectively reducing aluminum foil loss.

[0018] In some embodiments, the first resin layer is made of at least one material selected from polyamide, polyimide, polyethylene terephthalate, polypropylene, and polyethylene, and / or the second resin layer is made of at least one material selected from polyamide, polyimide, polyethylene terephthalate, polypropylene, and polyethylene. These materials possess good mechanical properties, and using them as materials for the first and / or second resin layers can improve the mechanical properties of the fire extinguishing assembly.

[0019] In some embodiments, the second resin layer is disposed on the side adjacent to the extinguishing agent layer, and the material used for the second resin layer includes polypropylene. Because polypropylene has good corrosion resistance, using it as the material for the second resin layer can effectively reduce the corrosion of the aluminum foil by the extinguishing agent layer.

[0020] In some embodiments, at least one resin layer further includes a third resin layer disposed on the side of the first resin layer facing away from the aluminum foil. The third resin layer includes at least one of polyethylene terephthalate (PET) and polyimide. On one hand, PET has a high melting point and temperature resistance, enabling the third resin layer to withstand high temperatures during heat sealing and making it suitable for packaging environments requiring temperature variations. On the other hand, PET has good corrosion resistance. Using it as the material for the third resin layer (adjacent to the pressure relief structure) allows the second resin layer to effectively protect the aluminum foil from corrosive substances (such as electrolytes) sprayed through the explosion-proof valve. This facilitates the fire extinguishing assembly's full performance in extinguishing fires, reduces the risk of larger-scale thermal runaway caused by flames, and prevents the enclosure from overheating and failing to perform its load-bearing function, or even melting through.

[0021] In some embodiments, the thickness ratio of the first resin layer, the aluminum foil, and the second resin layer is in the range of (20-25):(40-55):(45-80):(0-25). By controlling the thickness ratio of the first resin layer, the aluminum foil, and the second resin layer within the above range, both the mechanical properties and the compactness of the package can be achieved.

[0022] In some embodiments, the thickness of the encapsulation is in the range of 110 μm to 1000 μm. Setting the thickness of the encapsulation within this range helps to balance the mechanical properties and density of the encapsulation. Furthermore, it facilitates the creation of lightweight fire extinguishing components.

[0023] In some embodiments, the extinguishing agent layer is made of at least one of gaseous extinguishing agents, liquid extinguishing agents, and solid extinguishing agents. This helps the extinguishing components to fully exert their extinguishing function, reduces the risk of large-scale thermal runaway caused by flames, and prevents the housing from becoming too hot to bear the load, or even melting through.

[0024] In some embodiments, the extinguishing agent layer is made of a gaseous extinguishing agent. Gaseous extinguishing agents respond rapidly to high temperatures upon initial contact with flames, thereby quickly suppressing the further spread of the fire. Furthermore, gaseous extinguishing agents do not leave residues on batteries or equipment, avoiding any adverse effects of residues on individual battery cells.

[0025] In some embodiments, the gaseous extinguishing agent includes at least one of inert gas extinguishing agents, carbon dioxide extinguishing agents, heptafluoropropane extinguishing agents, hexafluoropropane extinguishing agents, and perfluorohexanone extinguishing agents. These extinguishing agents have high diffusivity, and after release, they can rapidly diffuse and inhibit further flame spread, reducing the risk of larger-scale thermal runaway caused by the flame and preventing the enclosure from overheating and failing to perform its load-bearing function, or even melting through.

[0026] In some embodiments, along the first direction, the distance between the side of the fire extinguishing assembly facing away from the pressure relief structure and the side of the pressure relief structure facing the fire extinguishing assembly is denoted as L1, where L1 is in the range of 8 mm to 10 mm. This arrangement facilitates, on the one hand, using the gap between the fire extinguishing assembly and the pressure relief structure to buffer the pressure of the flame, thereby mitigating the impact of the flame on the fire extinguishing assembly. On the other hand, it facilitates the miniaturization of the battery device.

[0027] In some embodiments, along the first direction, the distance between the side of the fire extinguishing component facing the pressure relief structure and the side of the pressure relief structure facing the fire extinguishing component is denoted as L2, and the thickness of the fire extinguishing component in the first direction is denoted as L3. L3 and L2 satisfy the following relationship: 0.1≤L3 / L2≤1.5. This, on the one hand, helps reduce the impact of the flame released from the pressure relief structure on the fire extinguishing component, thereby facilitating the fire extinguishing component's fire extinguishing function, reducing the risk of large-scale thermal runaway caused by the flame, and preventing the housing from overheating and failing to perform its load-bearing function, or even melting through. On the other hand, it facilitates the miniaturization of the battery device.

[0028] In some embodiments, L3 is in the range of 1mm to 6mm. This, on the one hand, helps the fire extinguishing component to fully exert its fire extinguishing function, thereby helping to reduce the internal temperature of the battery device, reducing the risk of large-scale thermal runaway caused by high temperatures, and preventing the casing from becoming too hot to bear the load, or even melting through. On the other hand, it facilitates the miniaturization of the battery device.

[0029] In some embodiments, the ratio of the area of ​​the pressure relief structure projected onto the fire extinguishing assembly along the first direction to the area of ​​the fire extinguishing assembly facing the pressure relief structure is in the range of 1:(1-12). With this configuration, the area of ​​the fire extinguishing assembly is moderate, allowing it to effectively receive the ejected flames and improve extinguishing efficiency. Furthermore, it reduces the overuse of the fire extinguishing assembly and lowers its weight, thus facilitating the creation of a lightweight battery device.

[0030] In some embodiments, the battery device includes multiple battery cells, each with its own fire extinguishing component. By providing a fire extinguishing component for each battery cell, the flames emitted by any one battery cell in the event of thermal runaway can be quickly extinguished using its corresponding fire extinguishing component. This design reduces the transfer of heat to surrounding battery cells, thus mitigating the risk of a chain reaction.

[0031] In some embodiments, the battery device includes multiple fire extinguishing components connected by a protective mesh. Due to the connection of the protective mesh, the battery device's resistance to flame impact is enhanced, which helps reduce damage caused by flame impact.

[0032] In some embodiments, the battery device further includes a housing having a receiving space in which the battery cells and fire extinguishing components are housed.

[0033] A second aspect of this disclosure provides an electrical device, which includes the battery device provided in the first aspect.

[0034] In some embodiments, the electrical device includes an aircraft.

[0035] A third aspect of this disclosure provides an energy storage device, which includes the battery device provided in the first aspect.

[0036] In this disclosure, a fire extinguishing component is installed at a relative position to the pressure relief structure in a first direction. When the battery device experiences thermal runaway, the flame ejected through the pressure relief structure can contact the fire extinguishing component. The fire extinguishing component consists of a protective mesh and a layer of extinguishing agent disposed inside the protective mesh. The flame can penetrate the protective mesh and directly contact the extinguishing agent layer, allowing the extinguishing agent layer to extinguish the flame, thereby reducing damage to the battery device's casing. Attached Figure Description

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0038] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0039] Figure 2 is a three-dimensional exploded view of a battery provided in some embodiments of this disclosure;

[0040] Figure 3 is a cross-sectional view of the battery in Figure 2 on the AA' plane;

[0041] Figure 4 is a magnified view of a portion of region A in Figure 3;

[0042] Figure 5 is a top view of a portion of the battery device structure provided in some embodiments of this disclosure;

[0043] Figure 6 is a cross-sectional view of the battery device in Figure 5 on the BB' plane;

[0044] Figure 7 is a cross-sectional view of several fire extinguishing components provided in some embodiments of this disclosure in the XY plane;

[0045] Figure 8 is a schematic diagram of a fire extinguishing assembly provided in some embodiments of this disclosure;

[0046] Figure 9 is a cross-sectional view of the fire extinguishing assembly shown in Figure 8 on the CC' plane;

[0047] Figure 10 is another cross-sectional view of the fire extinguishing assembly shown in Figure 8 on the CC' plane;

[0048] Figure 11 is a schematic diagram of a package provided in some embodiments of this disclosure.

[0049] Explanation of reference numerals in the attached drawings: 1000 Vehicle; 100 Battery unit; 200 Controller; 300 Motor; 10 Battery unit housing; 20 Battery cell; 101 First housing; 102 Second housing; 21 Electrode assembly; 22 Housing; 23 Positive electrode terminal; 24 Negative electrode terminal; 25 Pressure relief structure; 221 Housing; 222 Cover; 1 Fire extinguishing assembly; 2 Bottom guard plate; 3 Pressure strip; 4 Exhaust channel; 11 Protective net; 12 Extinguishing agent layer; 13 Encapsulation component; 131 Resin layer; 132 Aluminum foil; 1311 First resin layer; 1312 Second resin layer; 1313 Third resin layer. Detailed Implementation

[0050] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0051] 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 disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" 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 or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0053] 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 disclosure. 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.

[0054] In the description of the embodiments of this disclosure, 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, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0055] In the description of the embodiments of this disclosure, 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 disclosure and simplifying the description, and are not intended to 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 disclosure.

[0056] In the description of the embodiments of this disclosure, 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 disclosure according to the specific circumstances.

[0057] In the description of the embodiments of this disclosure, 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.

[0058] In the embodiments of this disclosure, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0059] In cases of thermal runaway caused by battery overcharging or other abnormal conditions, a large amount of flame or high-temperature smoke can accumulate inside a single battery cell, leading to a surge in internal pressure. To address this dangerous situation, each battery cell is equipped with a specialized pressure relief structure. When excessive internal pressure is detected, this structure automatically activates, opening a venting channel to release excess pressure and effectively prevent the battery cell from exploding. However, the activation of the pressure relief structure is not without side effects. When activated, the flame and high-temperature smoke can directly contact the battery pack casing, potentially causing it to melt and penetrate.

[0060] Reducing the impact of flames on the battery enclosure is a pressing technical problem. To address this, a fire extinguishing component can be designed at a location relative to the pressure relief structure. This component can come into contact with and extinguish the flames in the event of battery thermal runaway, thereby reducing the risk of the battery enclosure melting and breaking down.

[0061] Based on this design concept, this disclosure provides a battery device, which includes: a battery cell and a fire extinguishing assembly. The battery cell has a pressure relief structure. Each fire extinguishing assembly is disposed opposite to the pressure relief structure along a first direction. The fire extinguishing assembly includes a fire extinguishing agent layer and a protective net with a receiving cavity, wherein the fire extinguishing agent layer is received in the receiving cavity of the protective net.

[0062] In this disclosure, a fire extinguishing component is installed at a relative position to the pressure relief structure in a first direction. When the battery device experiences thermal runaway, the flame ejected through the pressure relief structure can contact the fire extinguishing component. The fire extinguishing component consists of a protective mesh and a layer of extinguishing agent disposed inside the protective mesh. The flame can penetrate the protective mesh and directly contact the extinguishing agent layer, allowing the extinguishing agent layer to extinguish the flame, thereby reducing damage to the battery device's casing.

[0063] The battery apparatus mentioned in the embodiments of this disclosure may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0064] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0065] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0066] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0067] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0068] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0069] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0070] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0071] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0072] The technical solutions described in this disclosure are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0073] In this application, "aircraft" generally refers to a device that flies within or outside the atmosphere (space), and may include aircraft flying within the atmosphere and spacecraft flying in space. Aircraft may include airplanes, airships, etc., and for example, may be low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc.

[0074] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0075] The battery cell 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 disclosed herein are not limited to this.

[0076] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0077] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0078] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0079] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, silver-treated aluminum or stainless steel, copper, aluminum, nickel, titanium, etc., can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, the embodiments of this disclosure are not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0081] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0082] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0083] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver surface treatment, or stainless steel, copper, aluminum, nickel, titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0084] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0085] In some embodiments, the separator is a separator membrane. This disclosure does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0086] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0087] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0088] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0089] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0090] In some embodiments, the electrode assembly is a stacked structure. As an example, multiple positive and negative electrode sheets can be provided, with multiple positive and multiple negative electrode sheets alternately stacked. As an example, multiple positive electrode sheets can be provided, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments. As an example, both positive and negative electrode sheets are folded to form multiple stacked folded segments. As an example, multiple spacers can be provided, respectively disposed between any adjacent positive or negative electrode sheets. As an example, spacers can be continuously provided, disposed between any adjacent positive or negative electrode sheets by folding or winding.

[0091] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0092] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments disclosed herein.

[0094] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device according to an embodiment of this disclosure. Some embodiments of this disclosure will be described in detail below with reference to Figures 1 to 11.

[0095] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of the present disclosure; Figure 2 is a three-dimensional exploded schematic diagram of a battery provided in some embodiments of the present disclosure; Figure 3 is a cross-sectional view of the battery in Figure 2 on the AA' plane; Figure 4 is a partial enlarged view of region A in Figure 3; Figure 5 is a top view of a partial structure of a battery device provided in some embodiments of the present disclosure; Figure 6 is a cross-sectional view of the battery device in Figure 5 on the BB' plane; Figure 7 is a cross-sectional view of multiple fire extinguishing components provided in some embodiments of the present disclosure on the XY plane; Figure 8 is a schematic diagram of a fire extinguishing component provided in some embodiments of the present disclosure; Figure 9 is a cross-sectional view of the fire extinguishing component provided in Figure 8 on the CC' plane; Figure 10 is another cross-sectional view of the fire extinguishing component provided in Figure 8 on the CC' plane; Figure 11 is a schematic diagram of a package provided in some embodiments of the present disclosure.

[0096] Referring to Figure 1, a battery cell 100 is disposed inside the vehicle 1000. The battery cell 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery cell 100 can be used to power the vehicle 1000; for example, the battery cell 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 cell 100 to supply power to the motor 300, for example, to meet the power requirements of the vehicle 1000 during starting, navigation, and driving.

[0097] In some embodiments of this disclosure, the battery cell 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.

[0098] Referring to Figure 2, the battery cell 100 includes a battery housing 10 and at least one battery cell 20. The battery housing 10 has a receiving space, and at least one battery cell 20 is received in the receiving space.

[0099] In some embodiments of this disclosure, the battery device housing 10 includes a second housing 102 and a first housing cover 101, with the first housing cover 101 covering the second housing 102, thereby forming an accommodating space between the second housing 102 and the first housing cover 101.

[0100] The second housing 102 can be a hollow structure with one top wall, and the first cover 101 can be a plate-like structure. The first cover 101 covers the top wall of the second housing 102 so that the first cover 101 and the second housing 102 together define the receiving space. Alternatively, the first cover 101 and the second housing 102 can both be hollow structures with one top wall, and the top wall of the first cover 101 covers the top wall of the second housing 102. Of course, the housing 10 of the battery device formed by the first cover 101 and the second housing 102 can be of various shapes, such as cylindrical, square, etc.

[0101] In a battery cell 100, there can be multiple battery cells 20. These multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is placed in the receiving space formed by the second housing 102 and the first housing cover 101. Alternatively, the battery cell 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed in the receiving space formed by the second housing 102 and the first housing cover 101. The battery cell 100 may also include other structures; for example, the battery cell 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20.

[0102] Referring to Figure 3, the battery cell 20 includes a housing 22 and an electrode assembly 21 housed within the housing 22, as well as other functional components.

[0103] Electrode assembly 21 is the component in the battery cell 20 where electrochemical reactions occur. The casing 221 may contain one or more electrode assemblies 21. The electrode assembly 21 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 21, 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 cell 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 24 to form a current loop.

[0104] In this disclosure, the housing 221 is a component used to cooperate with the cover 222 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 21, electrolyte, and other components. The housing 221 and the cover 222 can be independent components. An opening can be provided on the housing 221, and the cover 222 closes the opening to form the internal environment of the battery cell 20. Alternatively, the cover 222 and the housing 221 can be integrated. Specifically, the cover 222 and the housing 221 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 221, the cover 222 closes the housing 221. The housing 221 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 221 can be determined according to the specific shape and size of the electrode assembly 21. The shell 221 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This disclosure does not impose any special restrictions on this.

[0105] The cover 222 refers to a component that covers the opening of the housing 221 to isolate the internal environment of the battery cell 20 from the external environment. In any case, the shape of the cover 222 can be adapted to the shape of the housing 221 to fit it. Optionally, the cover 222 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the cover 222 is less prone to deformation under pressure and impact, enabling the battery cell 20 to have higher mechanical strength and improved safety performance.

[0106] The cover 222 may be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect to the electrode assembly 21 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the cover 222 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The cover 222 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this disclosure does not impose any special limitations on these materials. In some embodiments, an insulating member may be provided on the inner side of the cover 222. The insulating member can be used to isolate the electrical connection components within the housing 221 from the cover 222 to reduce the risk of short circuits. Exemplarily, the insulating member can be plastic, rubber, etc.

[0107] The battery cell 20 also includes a positive electrode terminal 23, a negative electrode terminal 24, and a pressure relief structure 25. The positive electrode terminal 23, negative electrode terminal 24, and pressure relief structure 25 are all mounted on the cover 222. The positive electrode terminal 23 and negative electrode terminal 24 are used for electrical connection with the electrode assembly 21 to output the electrical energy generated by the electrode assembly 21. The pressure relief structure 25 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a predetermined value. The pressure relief structure 25 can be a component such as an explosion-proof valve, explosion-proof disc, air valve, pressure relief valve, or safety valve, but is not limited to these.

[0108] This disclosure does not specifically limit the positions of the positive electrode terminal 23, the negative electrode terminal 24, and the pressure relief structure 25. In some embodiments, the pressure relief structure 25 is located between the positive electrode terminal 23 and the negative electrode terminal 24. Of course, in other embodiments, the positive electrode terminal 23 is located between the pressure relief structure 25 and the negative electrode terminal 24, or the negative electrode terminal 24 is located between the pressure relief structure 25 and the positive electrode terminal 23.

[0109] In some embodiments, the positive electrode terminal 23 and the negative electrode terminal 24 may be disposed on the same side cover 222 as the pressure relief structure 25. Referring again to FIG3, in some embodiments, the positive electrode terminal 23 and the negative electrode terminal 24 may be disposed on both sides of the cover 222 as the pressure relief structure 25, that is, the pressure relief structure 25 and the positive electrode terminal 23 / negative electrode terminal 24 are located on both sides of the electrode assembly 21.

[0110] Please refer to Figure 3. The battery device 100 disclosed in this disclosure includes at least one battery cell 20 and at least one fire extinguishing component 1. The battery cell 20 has a pressure relief structure 25, and the fire extinguishing component 1 is disposed opposite to the pressure relief structure 25 in a first direction Z. Each fire extinguishing component 1 is disposed opposite to the pressure relief structure 25 in the first direction. The fire extinguishing component 1 includes a fire extinguishing agent layer 12 and a protective net 11 with a receiving cavity. The fire extinguishing agent layer 12 is contained in the receiving cavity of the protective net 11.

[0111] In this disclosure, the pressure relief structure 25 can be a component such as an explosion-proof valve, an explosion-proof disc, a gas valve, a pressure relief valve, or a safety valve, but is not limited to these. The pressure relief structure 25 can release the internal pressure of the battery cell 20 in a timely manner when the internal pressure is too high, thus preventing the cell from exploding due to pressure buildup.

[0112] In this disclosure, the fire extinguishing assembly 1 and the pressure relief structure 25 are arranged opposite each other along a first direction so that the flames ejected through the pressure relief structure 25 can contact the fire extinguishing assembly 1 when the battery device 100 experiences thermal runaway. The fire extinguishing assembly 1 consists of a protective net 11 and a fire extinguishing agent layer 12 disposed inside the protective net 11. The flames can penetrate the protective net 11 and directly contact the fire extinguishing agent layer 12, so that the fire extinguishing agent layer 12 can extinguish the flames, thereby reducing the damage of the flames to the battery device housing 10.

[0113] Referring to Figures 8 and 9, in this disclosure, the fire extinguishing component 1 includes a protective net 11 and a fire extinguishing agent layer 12 housed within a containment cavity of the protective net 11.

[0114] In this disclosure, the protective net 11 has a built-in receiving cavity specifically designed to house the extinguishing agent layer 12. The protective net 11 provides protection and support for the extinguishing agent layer 12, ensuring its stability under both normal and abnormal conditions. Simultaneously, the surface of the protective net 11 is designed with mesh openings. These mesh openings allow flames to penetrate and contact the extinguishing agent layer 12 in the event of thermal runaway in the battery cell 20, activating the extinguishing effect of the extinguishing agent layer 12 and ensuring timely and effective control of the flames.

[0115] In some embodiments, the melting point of the protective net 11 is in the range of 800°C to 3500°C. By selecting a protective net 11 with a melting point in the above range, it is ensured that the protective net 11 can maintain its structural stability in the event of thermal runaway of the battery cell 20. This is beneficial for the fire extinguishing agent layer 12 inside to fully exert its fire extinguishing function, reduce the risk of larger-scale thermal runaway caused by flames, and prevent the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through. For example, the melting point of the protective net 11 is 800℃, 900℃, 1000℃, 1100℃, 1200℃, 1300℃, 1400℃, 1500℃, 1600℃, 1700℃, 1800℃, 1900℃, 2000℃, 2100℃, 2200℃, 2300℃, 2400℃, 2500℃, 2600℃, 2700℃, 2800℃, 2900℃, 3000℃, 3500℃, or any value between two of these two values.

[0116] In some embodiments, the melting point of the protective mesh 11 is in the range of 1200°C to 3500°C. By selecting a protective mesh 11 with a melting point in the above range, the battery device 100 is provided with higher safety and reliability, making the battery device 100 suitable for high-temperature environments and applications with higher performance requirements.

[0117] In some embodiments, the mesh area of ​​the protective net 11 is 0.01 mm. 2 Up to 1mm 2 The mesh area of ​​the protective net 11 is within the aforementioned range. On the one hand, this facilitates the flames to pass through the mesh and contact the extinguishing agent layer 12 more easily in the event of thermal runaway of the battery device 100, thereby improving extinguishing efficiency. On the other hand, it reduces the possibility of extinguishing agent leaking out of the mesh, thus reducing pollution to the internal environment of the battery device housing 10. For example, the mesh area of ​​the protective net 11 is 0.01 mm. 2 0.05mm 2 0.1mm 2 0.2mm 2 0.4mm 2 0.6mm 2 0.8mm 2 1mm 2Or any value between two values. In some embodiments, the material used for the protective net 11 includes at least one of titanium, gold, platinum, iron, cobalt, nickel, manganese, silver, copper, and tungsten. The above materials have high hardness and high melting point. By selecting a protective net 11 containing the above materials, it is ensured that the protective net 11 can still maintain its structural integrity when in contact with flames, providing reliable protection for the extinguishing agent layer 12. This is conducive to the extinguishing agent layer 12 fully exerting its fire extinguishing function, reducing the risk of larger-scale thermal runaway caused by flames, and preventing the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0118] In some embodiments, the surface of the protective mesh 11 is provided with an insulating layer. This design allows the protective mesh 11 to isolate the battery cell 20 from the battery housing 10, thereby reducing the risk of short circuits.

[0119] The embodiments disclosed herein do not impose specific limitations on the material used for the insulating layer. For example, the material used for the insulating layer includes, but is not limited to, plastic, rubber, resin, etc.

[0120] In some embodiments, the insulating layer is made of at least one of epoxy resin and polyimide.

[0121] Electrophoretic coating is a technique that uses an electric field to uniformly coat charged particles (coating) onto the surface of a conductive substrate. During electrophoresis, the charged particles in the coating move towards the opposite electrode under the influence of the electric field, thus depositing uniformly on the electrode surface. Epoxy resin and polyimide, as insulating materials, are electrically charged and can be uniformly deposited on the surface of the protective mesh 11 via electrophoresis.

[0122] Since epoxy resin and polyimide are insulating materials and are electrically conductive, they are loaded onto the surface of the protective net 11 by electrophoresis to form an insulating layer. This allows the insulating layer to be evenly distributed in every corner of the protective net 11, thereby improving the insulation performance of the protective net 11 and reducing the risk of short circuit in the battery device 100.

[0123] In some embodiments, the thickness of the insulating layer is in the range of 30 μm to 80 μm. By controlling the thickness of the insulating layer within the above range, the insulating layer can provide sufficient insulation performance, thereby reducing the risk of short circuit in the battery device 100. Exemplarily, the thickness of the insulating layer is 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, or any two of these values.

[0124] In some embodiments, under a test condition of 1000V DC voltage for 60 seconds, the insulation resistance of the protective mesh 11 is in the range of 500MΩ to 99GΩ. This helps to further reduce the risk of short circuit in the battery device 100. Exemplarily, the insulation resistance of the protective mesh 11 under the test condition of 1000VDC for 60s is 500MΩ, 600MΩ, 700MΩ, 800MΩ, 900MΩ, 1GΩ, 10GΩ, 50GΩ, 99GΩ, or any value between two of these two values.

[0125] In some embodiments, under a test condition of 2700V DC for 60 seconds, the withstand voltage leakage current of the protective mesh 11 can remain within the range of 0mA to 1mA. This helps to further reduce the risk of short circuit in the battery device 100. Exemplarily, the withstand voltage leakage current of the protective mesh 11 under the test condition of 2700VDC for 60 seconds is 1mA, 0.8mA, 0.7mA, 0.6mA, 0.5mA, 0.4mA, 0.3mA, 0.2mA, 0.1mA, 0mA, or any value between two of these two values.

[0126] Referring to Figure 10, to prevent the loss of extinguishing material in the extinguishing agent layer 12, the extinguishing assembly 1 also includes an encapsulation component 13. The encapsulation component 13 is arranged inside the receiving cavity and encapsulates the extinguishing agent layer 12. With this design, the encapsulation component 13 can prevent the loss of extinguishing material, thereby helping the extinguishing agent layer 12 to fully exert its extinguishing function, reducing the risk of larger-scale thermal runaway caused by flames, and preventing the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0127] In some embodiments, the melting point of the encapsulation component 13 is in the range of 160°C to 600°C. Encapsulation components 13 with melting points within this range can rapidly respond to high temperatures upon initial contact with a flame, promptly melting and releasing the internal extinguishing agent, thereby effectively suppressing the spread of fire, reducing the risk of larger-scale thermal runaway caused by the flame, and preventing the enclosure 10 from becoming too hot and unable to perform its load-bearing function, or even melting through. Exemplarily, the melting point of the encapsulation component 13 is 160°C, 200°C, 300°C, 400°C, 500°C, 600°C, or any value between two of these.

[0128] Referring to Figure 11, in some embodiments, the encapsulation 13 includes at least one resin layer 131 and an aluminum foil 132 stacked with the resin layer 131. The aluminum foil 132 has good mechanical strength, toughness, and density. When stacked with the resin layer 131, it can form a high-mechanical-strength and high-density encapsulation space, which helps to reduce the loss of the encapsulated fire extinguishing material inside. This helps the fire extinguishing agent layer 12 to fully exert its fire extinguishing function, reduces the risk of larger-scale thermal runaway caused by flames, and prevents the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0129] In this disclosure, the resin layer 131 is made of resin material, which includes, but is not limited to, at least one of epoxy resin, polypropylene resin, polyethylene resin, polyvinyl chloride resin, polyester resin, acrylic resin, phenolic resin, polyurethane resin, silicone resin, polyamide resin, polyimide resin, and polyvinyl alcohol resin.

[0130] Referring again to Figure 11, in some embodiments, at least one resin layer 131 includes a first resin layer 1311 and a second resin layer 1312, with an aluminum foil 132 stacked between the first resin layer 1311 and the second resin layer 1312. By disposing of the aluminum foil 132 between the first resin layer 1311 and the second resin layer 1312, the first resin layer 1311 and the second resin layer 1312 jointly provide protection for the aluminum foil 132, effectively reducing the loss of the aluminum foil 132.

[0131] In some embodiments, the first resin layer 1311 is made of at least one of polyamide, polyimide, polyethylene terephthalate, polypropylene, and polyethylene, and / or the second resin layer 1312 is made of at least one of polyamide, polyimide, polyethylene terephthalate, polypropylene, and polyethylene. These materials possess good mechanical properties, and using them as the materials for the first resin layer 1311 and / or the second resin layer 1312 can improve the mechanical properties of the fire extinguishing assembly 1. This facilitates the fire extinguishing agent layer 12 in fully exerting its fire extinguishing function, reduces the risk of large-scale thermal runaway caused by flames, and prevents the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0132] In some embodiments, the second resin layer 1312 is disposed on one side adjacent to the extinguishing agent layer 12, and the material used for the second resin layer 1312 includes polypropylene. Since polypropylene has good corrosion resistance, using it as the material for the second resin layer 1312 can effectively reduce the impact of corrosive substances (extinguishing agent) in the extinguishing agent layer 12 on the protective aluminum foil 132.

[0133] In some embodiments, at least one resin layer 131 further includes a third resin layer 1313, which is disposed on the side of the first resin layer 1311 facing away from the aluminum foil 132. The third resin layer 1313 includes at least one of polyethylene terephthalate (PET) and polyimide. On one hand, PET has a high melting point and temperature resistance, which allows the third resin layer to withstand high temperatures during heat sealing and is also suitable for packaging environments requiring temperature variations. On the other hand, PET has good corrosion resistance; using it as the material for the third resin layer 1313 (on the side adjacent to the explosion-proof valve) effectively protects the aluminum foil 132 from corrosive substances (such as electrolyte) ejected through the explosion-proof valve.

[0134] In some embodiments, the thickness ratio of the first resin layer 1311, the aluminum foil 132, and the second resin layer 1312 is in the range of (20-25):(40-55):(45-80):(0-25). By controlling the thickness ratio of the first resin layer 1311, the aluminum foil 132, and the second resin layer 1312 within the above range, both the mechanical properties and the compactness of the package 13 can be achieved. Exemplarily, the thickness ratio of the first resin layer 1311, the aluminum foil 132, and the second resin layer 1312 is 20:40:45:0, 25:40:45:25, 20:55:80:25, or any value between two of these values.

[0135] In some embodiments, the thickness of the encapsulation 13 is in the range of 110 μm to 1000 μm. By setting the thickness of the encapsulation 13 within the above range, it is beneficial to balance the mechanical properties and compactness of the encapsulation 13. On the other hand, it is beneficial to achieve a lightweight fire extinguishing assembly 1. Exemplarily, the thickness of the encapsulation 13 is 110 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, or any value between two of these two values.

[0136] In some embodiments, the extinguishing agent layer 12 is made of at least one of gaseous extinguishing agents, liquid extinguishing agents, and solid extinguishing agents. This reduces the risk of larger-scale thermal runaway caused by flames and prevents the housing 10 from becoming too hot to bear loads or even melting through.

[0137] In some embodiments, the extinguishing agent layer 12 is made of a gaseous extinguishing agent. The gaseous extinguishing agent responds rapidly to high temperatures upon initial contact with the flame, thereby quickly suppressing the further spread of the fire. Furthermore, the gaseous extinguishing agent does not leave residue on the battery or equipment, avoiding any adverse effects of residue on the battery cells 20.

[0138] In some embodiments, the gaseous extinguishing agent includes at least one of inert gas extinguishing agents, carbon dioxide extinguishing agents, heptafluoropropane extinguishing agents, hexafluoropropane extinguishing agents, and perfluorohexanone extinguishing agents. These extinguishing agents have high diffusivity, rapidly spreading after release to effectively suppress further flame spread, reduce the risk of large-scale thermal runaway caused by the flame, and prevent the housing 10 from overheating and failing to perform its load-bearing function, or even melting through.

[0139] This disclosure does not specify a particular method for fixing the fire extinguishing component 1; any fixing method known in the art can be used. For example, the fire extinguishing component 1 can be attached to the inner wall of the battery device housing 10 by adhesive.

[0140] Referring to Figure 3, in some embodiments, a bottom protective plate 2 can be provided on the inner wall of the battery housing 10 facing the pressure relief structure 25. The bottom protective plate 2 has excellent electrical insulation, thereby providing good insulation protection to prevent direct contact between the battery cells 20 and the battery housing 10, avoiding short circuits or electrical leakage. Furthermore, the bottom protective plate 2 has good heat resistance, isolating heat sources and further reducing the impact of flames on the battery housing 10.

[0141] In this application, the bottom protective plate 2 can be the bottom plate of the box 10, or it can be a bottom protective plate 2 separately provided in the box 10.

[0142] Please refer to Figure 3. In some embodiments, the fire extinguishing component 1 may be disposed between the bottom protective plate 2 and the pressure relief structure 25. Through the combined action of the fire extinguishing component 1 and the bottom protective plate 2, the impact of the flame on the battery device housing 10 is further reduced.

[0143] Please refer to Figure 3. In some embodiments, a pressure strip 3 can be provided between the bottom protective plate 2 and the battery cell 20. The design of the pressure strip 3 must avoid the pressure relief structure 25 so that the pressure strip 3 can form an exhaust channel 4 between the pressure relief structure 25 and the fire extinguishing assembly 1. One end of the exhaust channel 4 is connected to the pressure relief structure 25, and the other end is connected to the fire extinguishing assembly 1. When the battery cell 20 experiences thermal runaway, the flame is guided to the fire extinguishing assembly 1 through this exhaust channel 4 to extinguish the fire. In addition, the exhaust channel 4 can effectively prevent the flame from spreading to other battery cells 20, avoiding further spread of the thermal runaway phenomenon.

[0144] To mitigate the impact of flames on the fire extinguishing assembly 1 during thermal runaway of the battery cell 20, in some embodiments, a space is reserved between the pressure relief structure 25 and the fire extinguishing assembly 1. This space is used for pressure relief to alleviate the impact on the fire extinguishing assembly 1, thereby enabling the fire extinguishing assembly 1 to fully perform its fire extinguishing function, reducing the risk of larger-scale thermal runaway caused by flames, and preventing the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0145] Referring to Figures 3 and 4, in some embodiments, the distance between the side of the fire extinguishing component 1 facing away from the pressure relief structure 25 and the side of the pressure relief structure 25 facing the fire extinguishing component 1 is the dimension of the exhaust channel 4 in the first direction, which can be represented as L1 in this disclosure. This dimension can be adaptively adjusted according to the specific application scenario and requirements of the battery device 100.

[0146] In some embodiments, the distance L1 between the side of the fire extinguishing component 1 facing away from the pressure relief structure 25 and the side of the pressure relief structure 25 facing the fire extinguishing component 1 is 8 mm to 10 mm. This arrangement facilitates the buffering of flame pressure by utilizing the gap between the fire extinguishing component 1 and the pressure relief structure 25, thereby mitigating the impact of the flame on the fire extinguishing component 1. Furthermore, it facilitates the miniaturization of the battery device 100. Exemplarily, L1 is 8 mm, 8.2 mm, 8.4 mm, 8.6 mm, 8.8 mm, 9 mm, 9.2 mm, 9.4 mm, 9.6 mm, 9.8 mm, 10 mm, or any value between two of these two values.

[0147] Please refer to Figure 4. The distance between the pressure relief structure 25 and the fire extinguishing assembly 1 in the first direction, unless otherwise specified, generally refers to the distance between the side of the fire extinguishing assembly 1 facing the pressure relief structure 25 and the side of the pressure relief structure 25 facing the fire extinguishing assembly 1. This distance can be represented as L2 in this disclosure. L2 can be adaptively adjusted according to the specific application scenario and requirements of the battery device 100. The thickness of the fire extinguishing assembly 1 in the first direction in this disclosure can be represented as L3.

[0148] In some embodiments, the distance between the pressure relief structure 25 and the fire extinguishing assembly 1 in the first direction is inversely related to the thickness of the fire extinguishing assembly 1 in that direction. That is, the distance between the pressure relief structure 25 and the fire extinguishing assembly 1 can be adaptively adjusted according to the thickness of the fire extinguishing assembly 1. Specifically:

[0149] When the thickness of the fire extinguishing assembly 1 in the first direction is small, the distance between the pressure relief structure 25 and the fire extinguishing assembly 1 can be increased accordingly. By increasing the distance between the pressure relief structure 25 and the fire extinguishing assembly 1, the impact force of the flame can be effectively buffered, protecting the thinner fire extinguishing assembly 1 from damage.

[0150] In some embodiments, when the thickness of the fire extinguishing assembly 1 in the first direction is large, the distance between the pressure relief structure 25 and the fire extinguishing assembly 1 can be appropriately reduced. A thicker fire extinguishing assembly 1 inherently possesses higher structural strength, thus a smaller distance is sufficient to provide the necessary buffering effect. This not only optimizes space utilization and reduces the overall structural size but also maintains the effectiveness of the fire extinguishing assembly 1, thereby facilitating the fire extinguishing assembly 1 to fully perform its fire extinguishing function, reducing the risk of larger-scale thermal runaway caused by flames, and preventing the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through.

[0151] Referring again to Figure 4, in some embodiments, L2 and L3 satisfy the following relationship: 0.1 ≤ L3 / L2 ≤ 1.5. By controlling L3 / L2 within the above range, on the one hand, it is beneficial to reduce the impact of the flame released by the pressure relief structure 25 on the fire extinguishing component 1, thereby enabling the fire extinguishing component 1 to fully exert its fire extinguishing function, reducing the risk of larger-scale thermal runaway caused by the flame, and preventing the housing 10 from becoming too hot and unable to perform its load-bearing function, or even melting through. On the other hand, it is beneficial to realize the miniaturization of the battery device 100. Exemplarily, L3 / L2 is 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 1, 1.5, or any value between two of these two values.

[0152] In some embodiments, the distance L2 between the side of the fire extinguishing component 1 facing the pressure relief structure 25 and the side of the pressure relief structure 25 facing the fire extinguishing component 1 is in the range of 2mm to 4mm. This design helps to mitigate the impact of the flame ejected from the pressure relief structure 25 on the fire extinguishing component 1, and also facilitates the miniaturization of the battery device 100. Exemplarily, L2 is 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, or any value between two of these two values.

[0153] In some embodiments, the thickness L3 of the fire extinguishing component 1 in the first direction is in the range of 1 mm to 6 mm. The thickness of the fire extinguishing component 1 within this range reflects a moderate thickness, which on the one hand facilitates the fire extinguishing component 1 to fully exert its fire extinguishing function, thereby helping to reduce the internal temperature of the battery device 100 and thus reducing the risk of thermal runaway. On the other hand, it facilitates the miniaturization of the battery device 100. Exemplarily, L3 is 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, or any value between two of these two values.

[0154] When the flame is ejected from the pressure relief structure 25, it typically appears as a high-speed jet. To increase the flame-resistance capacity of the fire extinguishing assembly 1, as shown in Figure 6, in some embodiments, the projected area of ​​a single pressure relief structure 25 on the fire extinguishing assembly 1 is smaller than the area of ​​the end of the fire extinguishing assembly 1 facing the pressure relief structure 25. This design increases the contact area between the flame and the fire extinguishing assembly 1, helping to slow down the gas flow rate and reduce the impact force of the flame on the fire extinguishing assembly 1, thereby improving the durability of the fire extinguishing assembly 1.

[0155] In some embodiments, the ratio of the area of ​​a single pressure relief structure 25 projected onto the fire extinguishing assembly 1 to the area of ​​the fire extinguishing assembly 1 facing the pressure relief structure 25 is in the range of 1:(1-12). With this configuration, the area of ​​the fire extinguishing assembly 1 is moderate, allowing it to effectively receive the ejected flames and improve extinguishing efficiency. Furthermore, it reduces overuse of the fire extinguishing assembly 1 and lowers its weight, thus contributing to a lightweight battery device 100. Exemplarily, the ratio of the area of ​​a single pressure relief structure 25 projected onto the fire extinguishing assembly 1 to the area of ​​the fire extinguishing assembly 1 facing the pressure relief structure 25 is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, or any value between two such values.

[0156] This disclosure does not impose a specific limitation on the number of battery cells 20 included in the battery device 100, and the number of battery cells 20 included in the battery device 100 can be set according to needs. For example, the number of battery cells 20 included in the battery device 100 can be 1, 2, 3, 4, 10, 50, 100 or any value between two of these two values.

[0157] Please refer to Figures 2 through 5. In some embodiments, the battery device 100 includes multiple battery cells 20, each battery cell 20 being equipped with a corresponding fire extinguishing component 1. By providing a fire extinguishing component 1 for each battery cell 20, in the event of thermal runaway in any battery cell 20, the corresponding fire extinguishing component 1 can be used to quickly extinguish the flames released. This design reduces the transfer of heat to surrounding battery cells 20, thus reducing the risk of a chain reaction.

[0158] This disclosure does not impose a specific limitation on the number of fire extinguishing components 1 included in the battery device 100. The number of fire extinguishing components 1 included in the battery device 100 can be set according to requirements. It is only necessary to ensure that each battery cell 20 is provided with a corresponding fire extinguishing component 1. For example, the number of fire extinguishing components 1 included in the battery device 100 can be 1, 2, 3, 4, 10, 50, 100 or any value between two of these two values.

[0159] In some embodiments, each fire extinguishing component 1 corresponds to one battery cell 20, and the fire extinguishing components 1 are spaced apart from each other. This design helps to further reduce the transfer of heat to the surrounding battery cells 20 and reduce the risk of a chain reaction.

[0160] In some embodiments, the battery device 100 further includes a housing 10 having a receiving space in which the battery cell 20 and the fire extinguishing component 1 are received.

[0161] Referring to Figure 7, in some embodiments, the battery device 100 includes a plurality of fire extinguishing components 1, and the protective nets 11 of the plurality of fire extinguishing components 1 are connected. Due to the connection of the protective nets 11, the battery device 100 is enhanced to resist flame impact, which helps to reduce damage caused by flame impact.

[0162] Referring to Figures 2 to 8, in one specific embodiment, the battery device 100 includes: a battery cell 20 and a fire extinguishing assembly 1. The battery cell 20 has a pressure relief structure 25. The fire extinguishing assembly 1 and the pressure relief structure 25 are arranged opposite to each other in a first direction. Each fire extinguishing assembly 1 and the pressure relief structure 25 are arranged opposite to each other in the first direction. The fire extinguishing assembly 1 includes a fire extinguishing agent layer 12 and a protective net 11 with a receiving cavity. The fire extinguishing agent layer 12 is received in the receiving cavity of the protective net 11.

[0163] In this disclosure, a fire extinguishing assembly 1 is arranged at a relative position to the pressure relief structure 25 in a first direction. When the battery device 100 experiences thermal runaway, the flame ejected through the pressure relief structure 25 can contact the fire extinguishing assembly 1. The fire extinguishing assembly 1 consists of a protective net 11 and a fire extinguishing agent layer 12 disposed inside the protective net 11. The flame can penetrate the protective net 11 and directly contact the fire extinguishing agent layer 12, allowing the fire extinguishing agent layer 12 to extinguish the flame, thereby reducing damage to the battery device housing 10 from the flame.

[0164] Example:

[0165] The following describes embodiments of this application. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all conventional products that can be obtained commercially.

[0166] Example 1

[0167] (1) Provide battery cells:

[0168] (11) Preparation of the isolation component:

[0169] A 7μm polyethylene film is used as the separator (separator).

[0170] (12) Preparation of the positive electrode sheet:

[0171] LiNi 0.8 Co 0.1 Mn 0.1O2, conductive carbon black, and polyvinylidene fluoride (PVDF) are mixed in a mass ratio of 97.2:1:1.8, and then N-methylpyrrolidone solvent is added and stirred until homogeneous to obtain a positive electrode slurry. The positive electrode slurry is coated on both surfaces of an aluminum foil, and after drying, cold pressing, die-cutting, and slitting, a positive electrode sheet is obtained.

[0172] (13) Preparation of negative electrode sheet:

[0173] Graphite, conductive carbon black, styrene-butadiene rubber (SBR), and carboxymethyl cellulose were mixed in a mass ratio of 97.7:0.7:1:0.6, then added to water and stirred until homogeneous to obtain a negative electrode slurry. The negative electrode slurry was coated onto both surfaces of the negative electrode current collector copper foil, and after drying and cold pressing, a negative electrode sheet was obtained.

[0174] (14) Preparation of electrolyte:

[0175] Ethylene carbonate, diethyl carbonate, and dimethyl carbonate were mixed in a volume ratio of 1:1:1 to obtain a mixed solvent. Then, fully dried lithium salt LiPF6 was dissolved in the mixed organic solvent to prepare an electrolyte with a concentration of 1 mol / L.

[0176] (15) Assembly of individual battery cells:

[0177] Arrange the negative electrode, separator, and positive electrode in sequence, with the separator positioned between the negative and positive electrodes to provide isolation. Then, wind and weld the tabs to obtain the electrode assembly.

[0178] A hole suitable for installing the explosion-proof valve (pressure relief structure) is pre-drilled in the aluminum housing. The explosion-proof valve is then installed into the hole in the aluminum housing. This typically involves ensuring a tight fit between the sealing portion of the explosion-proof valve and the aluminum housing, and guaranteeing a good seal.

[0179] Electrode components are placed in an aluminum shell and injected with electrolyte. After encapsulation, settling, formation, and capacity testing, a battery cell is prepared.

[0180] (2) Provide battery devices;

[0181] Five battery cells are modularly assembled, electrically connected, and installed inside the enclosure. A fire extinguishing assembly is installed for each battery cell's explosion-proof valve; the structure of the fire extinguishing assembly can be seen in Figure 8. The parameters of the protective mesh in the fire extinguishing assembly can be found in Table 1, and the parameters of the extinguishing agent and encapsulation components in the fire extinguishing assembly can be found in Table 2.

[0182] Examples 2 to 10

[0183] The battery device is prepared in a similar manner to that of Example 1, except that the protective net in the fire extinguishing assembly is adjusted according to the description in Table 1, and / or the fire extinguishing agent layer and encapsulation component in the fire extinguishing assembly are adjusted according to the description in Table 2.

[0184] Comparative Example 1

[0185] The battery device was prepared using a similar scheme to Example 1, except that the fire extinguishing agent layer in Comparative Example 1 was not surrounded by a protective net.

[0186] Comparative Example 2

[0187] The battery device was prepared using a scheme similar to that of Example 1, except that Comparative Example 2 did not include a fire extinguishing component.

[0188] Testing the performance of protective netting

[0189] (1) Testing the mesh area of ​​the protective netting;

[0190] The side length of the mesh was measured using a micrometer, and then the area of ​​a single mesh was calculated based on the side length of the mesh. The test results are recorded in Table 1.

[0191] (2) Testing the thickness of the insulation layer in the protective net;

[0192] The thickness of the insulation layer was measured using a micrometer, and the test results are recorded in Table 1.

[0193] (3) Testing the insulation resistance of the protective net;

[0194] Insulation resistance was tested according to the method in IEC 60243 standard. The test voltage was 1000VDC and the test time was 60s. The test results are recorded in Table 1.

[0195] (4) Testing the withstand voltage and leakage current of the protective net;

[0196] The withstand voltage and leakage current test was performed according to the method in IEC 60243 standard. The test voltage was 3800VDC and the test time was 60s. The test results are recorded in Table 1.

[0197] Package performance testing

[0198] (1) Testing the melting point of the packaged components;

[0199] The melting point of the package was tested according to ISO 11357-3:2018, and the test results are recorded in Table 2.

[0200] Table 1

[0201] In Table 1, " / " indicates that no related items have been set.

[0202] Table 2

[0203] PA represents polyamide, PP represents polypropylene, and PET represents polyethylene terephthalate. The thickness ratio indicates the ratio of the thickness of the first resin layer, the aluminum foil, and the second resin layer.

[0204] Battery device performance testing

[0205] The battery devices of Examples 1 to 10 and Comparative Examples 1 and 2 were respectively processed as follows:

[0206] A 30*30mm heating element was attached to the center of the large surface of one of the battery cells. After power was applied, the battery cell experienced thermal runaway when the temperature of the large surface reached 255℃ in about 30 seconds.

[0207] Observe whether the battery device casing is melted through, whether the battery device extinguishes the flame, and test whether the extinguishing agent achieves insulation effect after release. The test results are recorded in Table 3.

[0208] Table 3

[0209] The data in Tables 1 to 3 show that the battery devices provided in Examples 1 to 10 have fire extinguishing components installed at the corresponding positions of the pressure relief structures of each battery cell. In the event of thermal runaway, the protective mesh of the battery devices provided in Examples 1 to 10 can disperse the thermal shock. Furthermore, the fire extinguishing agent layer inside the protective mesh can extinguish the fire. Therefore, the probability of the casing being melted through is low, and the battery devices provided in Examples 1 to 10 have enhanced resistance to flame impact. Moreover, after the fire extinguishing agent is released, the remaining protective mesh can still provide insulation between the battery cell and the casing.

[0210] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and not to limit them. Although this disclosure 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 disclosure, and they should all be covered within the scope of the claims and specification of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This disclosure 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, wherein, include: At least one battery cell, the battery cell having a pressure relief structure, the pressure relief port of the pressure relief structure facing a first direction; At least one fire extinguishing component, each of the fire extinguishing components being disposed opposite to the pressure relief structure along the first direction, the fire extinguishing component including a fire extinguishing agent layer and a protective net having a receiving cavity, the fire extinguishing agent layer being contained within the receiving cavity of the protective net.

2. The battery device of claim 1, wherein, The melting point of the protective net is in the range of 800℃ to 3500℃.

3. The battery device according to claim 1 or 2, wherein The melting point of the protective net is in the range of 1200℃ to 3500℃.

4. The battery device according to any one of claims 1 to 3, wherein The mesh area of the protective net is in the range of 0.01mm 2 to 1mm 2 .

5. The battery device according to any one of claims 1 to 4, wherein The protective netting is made of at least one of the following materials: titanium, gold, platinum, iron, cobalt, nickel, manganese, silver, copper, and tungsten.

6. The battery device according to any one of claims 1 to 5, wherein The surface of the protective net is provided with an insulating layer.

7. The battery device of any one of claim 6, wherein, The insulating layer is made of at least one of epoxy resin and polyimide.

8. The battery device according to claim 6 or 7, wherein The thickness of the insulating layer is in the range of 30 μm to 80 μm.

9. The battery device according to any one of claims 1 to 8, wherein Under the test condition of applying a 1000V DC voltage continuously for 60 seconds, the insulation resistance of the protective net is in the range of 500MΩ to 99GΩ.

10. The battery device according to any one of claims 1 to 9, wherein Under the test condition of applying a 2700V DC voltage continuously for 60 seconds, the withstand voltage leakage current of the protective mesh is in the range of 0mA to 1mA.

11. The battery device according to any one of claims 1 to 10, wherein The fire extinguishing assembly also includes: a packaging component; The encapsulation component is disposed within the receiving cavity and encapsulates the fire extinguishing agent layer.

12. The battery device of claim 11, wherein, The melting point of the package is in the range of 160°C to 600°C.

13. The battery device according to claim 11 or 12, wherein The encapsulation includes at least one resin layer and an aluminum foil stacked with the resin layer.

14. The battery device of claim 13, wherein, The at least one resin layer includes a first resin layer and a second resin layer, and the aluminum foil is disposed between the first resin layer and the second resin layer.

15. The battery device according to claim 14, wherein, The first resin layer is made of at least one of polyamide, polyimide, polyethylene terephthalate, polypropylene, and polyethylene. And / or, The material used for the second resin layer includes at least one of polyamide, polyimide, polyethylene terephthalate, polypropylene, and polyethylene.

16. The battery device of claim 15, wherein, The second resin layer is disposed on one side adjacent to the extinguishing agent layer, and the material used for the second resin layer includes polypropylene.

17. The battery device of any one of claims 14-16, wherein, The resin layer also includes a third resin layer, which is disposed on the side of the first resin layer away from the aluminum foil, and the third resin layer includes polyethylene terephthalate.

18. The battery device of claim 17, wherein, The thickness ratio of the first resin layer, the aluminum foil, the second resin layer and the third resin layer is in the range of (20-25):(40-55):(45-80):(0-25).

19. The battery device of any one of claims 14-18, wherein, The thickness of the package is in the range of 110 μm to 1000 μm.

20. The battery device of any one of claims 1-19, wherein, The extinguishing agent layer is made of at least one of gaseous extinguishing agents, liquid extinguishing agents, and solid extinguishing agents.

21. The battery device of any one of claims 1-20, wherein, The extinguishing agent layer is made of materials including gaseous extinguishing agents.

22. The battery device of claim 20 or 21, wherein, The gaseous extinguishing agent includes at least one of the following: inert gas extinguishing agent, carbon dioxide extinguishing agent, heptafluoropropane extinguishing agent, hexafluoropropane extinguishing agent, and perfluorohexanone extinguishing agent.

23. The battery device of any one of claims 1-22, wherein, Along the first direction, the distance between the side of the fire extinguishing component away from the pressure relief structure and the side of the pressure relief structure facing the fire extinguishing component is denoted as L1, and L1 is in the range of 8mm to 10mm.

24. The battery device of any one of claims 1-23, wherein, Along the first direction, the distance between the side of the fire extinguishing component facing the pressure relief structure and the side of the pressure relief structure facing the fire extinguishing component is denoted as L2, and the thickness of the fire extinguishing component in the first direction is denoted as L3. The relationship between L3 and L2 is as follows: 0.1≤L3 / L2≤1.

5.

25. The battery device of claim 24, wherein, The L3 ranges from 1 mm to 6 mm.

26. The battery device of any one of claims 1-25, wherein, The ratio of the area of ​​the pressure relief structure projected onto the fire extinguishing assembly along the first direction to the area of ​​the fire extinguishing assembly facing the pressure relief structure is in the range of 1:(1-12).

27. The battery device of any one of claims 1-26, wherein, The battery device includes multiple battery cells, and the fire extinguishing component is respectively installed for each battery cell.

28. The battery device of any one of claims 1-27, wherein, The battery device includes multiple fire extinguishing components, and the protective nets of the multiple fire extinguishing components are connected together.

29. The battery device of any one of claims 1-28, wherein, The battery device also includes a housing with a receiving space, in which the battery cells and the fire extinguishing components are housed.

30. An electrical device, comprising: The electrical device includes the battery device according to any one of claims 1 to 29.

31. The powered device of claim 30, wherein, The electrical equipment includes aircraft.

32. An energy storage device, wherein, The energy storage device includes the battery device according to any one of claims 1 to 29.

Images