Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a box body, a battery monomer and a fire-fighting assembly, the box body comprises a containing space. The battery monomers are arranged in the accommodating space; the fire-fighting assembly is arranged in the box body. The fire-fighting assembly comprises a working medium transmission part and a heating part. The heating component is arranged on the working medium transmission component. The heating component covers at least part of the working medium transmission component. The working medium conveying component is used for conveying fire-fighting working media to the containing space. The heating component is used for heating and vaporizing the fire-fighting working medium conveyed by the working medium conveying component so that the working medium conveying component can discharge the gaseous fire-fighting working medium into the containing space. The battery device provided by the utility model is beneficial to improving the safety of the battery device.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this sustainable development. Battery technology is a crucial factor in the development of electric vehicles. Improving battery safety has long been a key research topic within this field. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device and an electrical device, which are conducive to improving the safety of the battery device.

[0004] The present application provides a battery device, which includes a box, a battery cell and a fire protection component.

[0005] The housing includes a storage space. A battery cell is disposed within the storage space. A firefighting assembly is disposed within the housing. The firefighting assembly includes a fluid transfer component and a heating component. The heating component is disposed within the fluid transfer component. The heating component covers at least a portion of the fluid transfer component. The fluid transfer component is configured to deliver a firefighting fluid to the storage space. The heating component is configured to heat and vaporize the firefighting fluid delivered by the fluid transfer component, causing the fluid transfer component to discharge the gaseous firefighting fluid into the storage space.

[0006] The battery device of the embodiment of the present application includes a casing, a battery cell and a fire-fighting component. The fire-fighting component includes a working fluid transmission component and a heating component. The working fluid transmission component is used to transport the fire-fighting working fluid to the storage space. The heating component is used to heat and vaporize the fire-fighting working fluid transported by the working fluid transmission component. In the event that thermal runaway of the battery cell is detected, the heating component and the working fluid transmission component can be started. The heating component can heat the fire-fighting working fluid in the working fluid transmission component so that the liquid fire-fighting working fluid in the working fluid transmission component is converted into a gaseous fire-fighting working fluid. The working fluid transmission component can discharge the gaseous fire-fighting working fluid into the storage space. The gaseous fire-fighting working fluid can quickly fill the storage space of the casing so that the storage space forms an inert gas environment in a relatively short time, thereby reducing the oxygen concentration in the storage space, so that the combustible smoke is in an oxygen-deficient environment, and the combustible smoke is not easy to burn, thereby ensuring the safety of the battery device.

[0007] In some achievable embodiments, the heating component is a cylindrical structure having a through hole, and at least a portion of the working medium transmission component is accommodated in the through hole.

[0008] The heating component can heat the fire-fighting working fluid in the working fluid transmission component throughout the entire circumference of the working fluid transmission component. On the one hand, it is beneficial for the fire-fighting working fluid in the working fluid transmission component to be heated evenly and have a balanced vaporization effect; on the other hand, most of the heat generated by the heating component can be used to conduct the fire-fighting working fluid in the working fluid transmission component, which is beneficial to reduce heat loss, increase the heating rate of the fire-fighting working fluid, and improve heating efficiency.

[0009] In some achievable embodiments, the heating component is provided on the inner surface of the working medium transmission component for contacting the fire-fighting working medium.

[0010] When the fire-fighting working fluid is transported in the channel of the working fluid transmission component, the heating component can be in direct contact with the fire-fighting working fluid. The heat generated by the heating component can be directly conducted to the fire-fighting working fluid, thereby effectively improving the heating efficiency of the fire-fighting working fluid, which is beneficial to shortening the vaporization time of the fire-fighting working fluid, so that the fire-fighting working fluid can be converted from liquid to gas relatively quickly. The way in which the heating component is arranged on the inner surface of the working fluid transmission component, on the one hand, most of the heat generated by the heating component can be used to conduct to the fire-fighting working fluid, which is beneficial to reduce heat loss; on the other hand, the working fluid transmission component can form a protection for the heating component, reducing the possibility of the heating component being damaged and failed due to collisions and scratches with other structural parts; on the other hand, when the battery cell has thermal runaway, the combustible smoke ejected by the battery cell has a large impact force. The working fluid transmission component can effectively block the impact force from impacting the heating component, which is beneficial to reducing the possibility of the heating component being damaged and failed due to impact.

[0011] In some achievable embodiments, the working medium transmission component includes a delivery pipe and a nozzle portion connected to each other. The heating component is disposed in the delivery pipe. The nozzle portion is used to discharge the fire-fighting working medium into the accommodation space.

[0012] In the fluid transmission component, the firefighting fluid flows from the delivery pipe to the nozzle. The heating component heats the firefighting fluid in the delivery pipe, allowing the vaporized firefighting fluid to enter the nozzle buffer and ultimately be discharged into the storage space of the housing through the nozzle. Heating the firefighting fluid in the delivery pipe by the heating component helps ensure that the firefighting fluid is completely vaporized before entering the nozzle, reducing the possibility of liquid firefighting fluid remaining in the nozzle and affecting the efficient discharge of the gaseous firefighting fluid.

[0013] In some possible implementations, the heating component includes a heating film or a heating wire.

[0014] The heating film or heating wire can be easily designed into a structure that matches the surface contour of the working fluid transmission component, which helps to reduce the difficulty of arranging the heating component on the working fluid transmission component.

[0015] In some achievable embodiments, the firefighting assembly includes a temperature detector configured to detect a temperature of at least one of the working medium transmission component and the firefighting working medium.

[0016] The temperature signal collected by the temperature detector can be used to determine whether the current temperature is sufficient to ensure the successful vaporization of the liquid firefighting fluid. If the current temperature is judged to be too low, the heating power of the heating component needs to be increased to raise the heating temperature of the heating component and ensure the successful vaporization of the liquid firefighting fluid. If the current temperature is judged to be too high, the heating power of the heating component needs to be reduced to reduce energy loss.

[0017] In some possible implementations, the temperature detector is disposed outside the working medium transmission component.

[0018] The way in which the temperature detector is arranged outside the working fluid transmission component makes it relatively easy to arrange the temperature detector, which is conducive to reducing the difficulty of assembling the temperature detector and the working fluid transmission component.

[0019] In some achievable embodiments, the working medium transmission component includes a channel for conveying the fire-fighting working medium, and at least part of the temperature detector is disposed in the channel.

[0020] The temperature detector can directly detect the temperature of the fire-fighting working fluid, which can help improve the detection accuracy and reduce the possibility of misjudgment. In addition, when a battery cell experiences thermal runaway, the temperature in the accommodation space will rise. Since the temperature detector is arranged in the channel of the working fluid transmission component, the working fluid transmission component can isolate the heat released by the battery cell for a period of time to effectively prevent the heat released by the battery cell from contacting the temperature detector, thereby helping to reduce the possibility of the temperature detector being affected by the heat released by the battery cell, causing the temperature detector to be distorted and causing misjudgment, thereby ensuring that the temperature signal detected by the temperature detector can still accurately determine whether the current temperature can ensure that the liquid fire-fighting working fluid is successfully vaporized. If the temperature detector is affected by the heat released by the battery cell, the temperature detector detects that the current temperature is too high, resulting in a reduction in the heating power of the heating component, which in turn causes the temperature of the fire-fighting working fluid to be too low and fail to successfully complete vaporization, affecting the fire extinguishing effect.

[0021] In some achievable embodiments, the fire protection assembly includes a heat-insulating component. The heat-insulating component includes a receiving cavity. At least a portion of the working medium transmission component, at least a portion of the heating component, and at least a portion of the temperature detector are located in the receiving cavity.

[0022] The thermal insulation component provides protection for the fluid transmission component, the heating component, and the temperature detector. When a battery cell experiences thermal runaway, it releases heat, raising the temperature within the storage space. The thermal insulation component effectively isolates the heat released by the thermally runaway battery cell, effectively preventing the heat released by the battery cell from contacting at least one of the fluid transmission component, the heating component, and the temperature detector.

[0023] The heat insulation component can effectively prevent the heat released by the battery cells from contacting the working fluid transmission component, thereby helping to reduce the possibility of the working fluid transmission component being damaged or failing due to the heat released by the battery cells.

[0024] The heat-insulating component can effectively prevent the heat released by the battery cells from contacting the heating component, thereby helping to reduce the possibility of the heating component being damaged or failing due to the heat released by the battery cells.

[0025] The heat insulation component can effectively prevent the heat released by the battery cells from contacting the temperature detector, thereby helping to reduce the possibility that the temperature detector is affected by the heat released by the battery cells, resulting in distortion of the temperature detector detection and misjudgment.

[0026] In some possible implementations, the battery cell includes a pressure relief mechanism, and the working fluid transmission component, the heating component, and the temperature detector are all disposed on a side of the battery cell facing away from the pressure relief mechanism.

[0027] Since the working fluid transmission component, heating component and temperature detector are all arranged on the side of the battery cell facing away from the pressure relief mechanism, when the pressure relief mechanism opens to release the internal pressure of the battery cell, the high-temperature substance discharged by the pressure relief mechanism will not directly impact the working fluid transmission component, heating component and temperature detector, thereby helping to reduce the possibility of structural damage or failure of the working fluid transmission component, heating component and temperature detector due to high temperature impact.

[0028] In some implementations, the firefighting assembly includes a control valve, a delivery pipeline, and a thermal runaway signal collector. The working fluid transmission component is connected to the control valve via the delivery pipeline. The control valve is configured to open or close the delivery pipeline. The thermal runaway signal collector is in communication with the control valve.

[0029] When at least one of the voltage, temperature, and air pressure signals collected by the thermal runaway signal collector reaches a preset runaway threshold, it can accurately determine that a battery cell has experienced thermal runaway. The control valve is an electrically controlled valve. When thermal runaway is determined to have occurred in a battery cell, the control valve automatically opens to open the delivery pipeline. The firefighting fluid can be delivered to the fluid transmission component through the delivery pipeline. Simultaneously, the activated heating component heats the firefighting fluid, converting the liquid firefighting fluid into a gaseous state. The fluid transmission component discharges the gaseous firefighting fluid into the storage space of the box.

[0030] In some achievable embodiments, the fire protection component includes a thermal runaway warning signal collector, which is communicatively connected to the control valve.

[0031] Before the pressure relief mechanism of the battery cell opens, the thermal runaway warning signal collector can collect a signal indicating that thermal runaway has occurred inside the battery cell. The control valve can be opened automatically to conduct the delivery pipeline. The fire-fighting working fluid can be delivered to the working fluid transmission component through the delivery pipeline. At the same time, the heating component that starts working can heat the fire-fighting working fluid to convert the liquid fire-fighting working fluid into a gaseous fire-fighting working fluid. The working fluid transmission component discharges the gaseous fire-fighting working fluid into the accommodating space of the box body, thereby forming an inert gas environment in the accommodating space in advance, and then when the pressure relief mechanism of the battery cell opens to spray out the combustible smoke, the combustible smoke is in an oxygen-deficient environment, so that the combustible smoke is not easy to burn, thereby ensuring the safety of the battery device.

[0032] In some embodiments, the fire protection assembly includes a power switch and a power supply. The heating component and the power supply are electrically connected to the power switch, respectively. The power switch is used to connect the heating component and the power supply, or to disconnect the heating component and the power supply. The power supply is an independent power supply, or the power supply includes a battery cell.

[0033] When the battery unit is operating normally, the power switch disconnects the heating component from the power supply. The heating component is not powered. When the battery unit's operating state reaches a thermal runaway condition, the power switch can connect the heating component and the power supply to start heating the firefighting fluid delivered by the fluid transmission component.

[0034] The power supply can be an independent power supply. In the event of thermal runaway of a battery cell, the power supply is not easily affected and can still maintain normal operation, which helps reduce the possibility of the heating component failing to start due to power supply damage and ensures the good working reliability of the fire protection component.

[0035] The power source includes battery cells. The firefighting component can directly use the power provided by the battery cells within the housing to power the heating element. Therefore, the firefighting component does not require a separate power source, saving space within the housing and increasing the energy density of the battery unit.

[0036] In some possible implementations, the fire protection component includes a thermal runaway warning signal collector, which is communicatively connected to the power switch.

[0037] Before the pressure relief mechanism of the battery cell opens, the thermal runaway warning signal collector can collect a signal indicating that thermal runaway has occurred inside the battery cell. The power switch can connect the heating component and the power supply to start the heating component to heat the fire-fighting working fluid transported by the working fluid transmission component, thereby converting the liquid fire-fighting working fluid into a gaseous fire-fighting working fluid. The working fluid transmission component discharges the gaseous fire-fighting working fluid into the storage space of the box body, thereby forming an inert gas environment in the storage space in advance. Then, when the pressure relief mechanism of the battery cell opens to spray out the combustible smoke, the combustible smoke is in an oxygen-deficient environment, making it difficult for the combustible smoke to burn, thereby ensuring the safety of the battery device.

[0038] The embodiment of the present application provides an electrical device, which includes the above-mentioned battery device. The battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0040] Figure 1 is a structural schematic diagram of a vehicle provided in one embodiment of the present application;

[0041] Figure 2 is a schematic diagram of a partially exploded structure of a battery device provided in one embodiment of the present application;

[0042] Figure 3 This is a schematic structural diagram of a battery module provided in one embodiment of the application;

[0043] Figure 4 This is a schematic diagram of a partially exploded structure of a battery cell provided in one embodiment of the present application;

[0044] Figure 5 is a schematic diagram of a partially exploded structure of a battery device provided in one embodiment of the present application;

[0045] Figure 6 This is a partial structural diagram of a fire protection assembly provided in one embodiment of the present application;

[0046] Figure 7 This is a partial cross-sectional structural diagram of a fire protection assembly provided in one embodiment of the present application;

[0047] Figure 8This is a partial cross-sectional structural diagram of a fire protection assembly provided in one embodiment of the present application;

[0048] Figure 9 This is a partial structural diagram of a fire protection assembly provided in one embodiment of the present application;

[0049] Figure 10 This is a partial cross-sectional structural diagram of a fire protection assembly provided in one embodiment of the present application;

[0050] Figure 11 This is a partial cross-sectional structural diagram of a fire protection assembly provided in one embodiment of the present application;

[0051] Figure 12 It is a partial structural diagram of a fire protection assembly provided in one embodiment of the present application.

[0052] Description of reference numerals:

[0053] 1. Vehicle; 10. Battery device; 10a. Housing; 10b. First housing portion; 10c. Second housing portion; 11. Controller; 12. Motor;

[0054] 20. Battery module;

[0055] 30. Battery cell; 31. Pressure relief mechanism;

[0056] 40. End cap; 41. Electrode terminal;

[0057] 50. Shell;

[0058] 60. Electrode assembly;

[0059] 70. Firefighting components;

[0060] 71, working medium transmission component; 71a, channel; 71b, through hole; 711, delivery pipe; 712, nozzle;

[0061] 72. Heating components;

[0062] 73. Liquid storage tank;

[0063] 74. Control valve;

[0064] 75. Transportation pipeline;

[0065] 76. Temperature detector;

[0066] 77. Insulation component; 771. Accommodation cavity;

[0067] 78. Thermal runaway signal collector;

[0068] 79. Thermal runaway warning signal collector;

[0069] 701, power switch;

[0070] 702. Power supply. DETAILED DESCRIPTION

[0071] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0072] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0073] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0074] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0075] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0076] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0077] Currently, market developments indicate that battery applications are becoming increasingly widespread. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0078] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0079] The battery device referred to in the embodiments of this application refers to a single physical module that includes multiple battery cells to provide higher voltage and capacity. The battery device referred to in this application may be a battery pack. For example, the battery device referred to in this application may include a battery module. A battery device generally includes a housing for enclosing multiple battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0080] The inventors of this application have noted that when a battery cell in a battery device experiences thermal runaway, it produces a large amount of flammable fumes. Oxygen in the air is a combustion aid. Combustible fumes easily ignite when in contact with air (e.g., air with an oxygen content of approximately 21%), potentially causing the entire battery device to combust or explode, impacting the device's safety.

[0081] In order to alleviate the problem of combustion of combustible flue gas, the applicant has found that the oxygen content in the air can be reduced to place the combustible flue gas in an oxygen-deficient environment, thereby making it less likely for the combustible flue gas to burn and ensuring the safety of the battery device.

[0082] Based on the above considerations, the inventors have designed a battery device after in-depth research. In such a battery device, the battery device includes a fire-fighting component. When a battery cell experiences thermal runaway, the fire-fighting component can deliver a gaseous fire-fighting medium into the box. The gaseous fire-fighting medium can quickly fill the storage space in the box to dilute the oxygen concentration in the storage space (for example, reduce the oxygen content to below 15%), reduce the oxygen content in the storage space, and thus put the combustible smoke in an oxygen-deficient environment, making it difficult for the combustible smoke to burn, thereby ensuring the safety of the battery device. The gaseous fire-fighting medium can quickly fill the entire storage space, so the fire-fighting component can deliver the gaseous fire-fighting medium at any position in the box, which is beneficial to improving the fire-fighting efficiency and fire-fighting effect of the fire-fighting component. The fire-fighting component does not need to be aimed at the fire point, which reduces the difficulty of arranging the fire-fighting component and makes the arrangement position of the fire-fighting component more flexible.

[0083] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0084] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0085] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including a box and electrical devices using the battery devices. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0086] Figure 1 The structure of the vehicle 1 is schematically shown. Figure 1As shown, vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. A battery device 10 is provided inside vehicle 1. Battery device 10 can be provided at the bottom, head or tail of vehicle 1. Battery device 10 can be used to power vehicle 1. For example, battery device 10 can serve as an operating power source for vehicle 1. Vehicle 1 can also include a controller 11 and a motor 12. Controller 11 is used to control battery device 10 to power motor 12. For example, it is used for starting, navigating and operating power requirements of vehicle 1 during driving.

[0087] In some embodiments of the present application, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0088] In order to meet different power requirements, the battery device 10 may include multiple battery cells. A battery cell refers to the smallest unit that makes up a battery module or a battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery device mentioned in this application includes a battery module or a battery pack. Among them, multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection refers to a mixture of series and parallel connection. In the embodiment of the present application, multiple battery cells can directly form a battery pack, or they can first form a battery module 20, and the battery module 20 can then form a battery pack.

[0089] Figure 2 A partial exploded structure of the battery device 10 is schematically shown. Figure 3 The structure of the battery module 20 is schematically shown. Figure 2 and Figure 3 As shown, the battery device 10 includes a housing 10a and battery cells 30. The battery cells 30 are accommodated in the housing 10a.

[0090] The housing 10a may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere, and the present embodiment is not limited thereto. The housing 10a may be made of an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin, and the present embodiment is not limited thereto.

[0091] The case 10a is used to accommodate the battery cell 30, and the case 10a can be of various structures. In some embodiments, the case 10a may include a first case portion 10b and a second case portion 10c. The first case portion 10b and the second case portion 10c cover each other. The first case portion 10b and the second case portion 10c jointly define a storage space for accommodating the battery cell 30. The second case portion 10c can be a hollow structure with one end open. In some embodiments, the first case portion 10b is a plate-like structure. The first case portion 10b covers the open side of the second case portion 10c to form a case 10a with a storage space. In some embodiments, the first case portion 10b and the second case portion 10c can also be hollow structures with one side open. The open side of the first case portion 10b covers the open side of the second case portion 10c to form a case 10a with a storage space. Of course, the first box body portion 10b and the second box body portion 10c can be in various shapes, such as cylinder, cuboid, etc.

[0092] In order to improve the sealing performance after the first box body portion 10b and the second box body portion 10c are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body portion 10b and the second box body portion 10c.

[0093] In some embodiments, the first housing portion 10b covers the top of the second housing portion 10c. The first housing portion 10b can also be referred to as an upper housing cover, and the second housing portion 10c can also be referred to as a lower housing.

[0094] The battery device 10 may include multiple battery cells 30. When there are multiple battery cells 30, they can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cell 30. The battery cells 30 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 30 can be housed within the housing 10a. Alternatively, the battery cells 30 can be connected in series, in parallel, or in a hybrid configuration to form a battery module. The battery modules can then be connected in series, in parallel, or in a hybrid configuration to form a single unit, which is then housed within the housing 10a.

[0095] In some embodiments, see Figure 3 As shown, there may be multiple battery cells 30. The multiple battery cells 30 are first connected in series, in parallel, or in series to form a battery module 20. The multiple battery modules 20 are then connected in series, in parallel, or in series to form a whole and accommodated in the box 10a.

[0096] The multiple battery cells 30 in the battery module 20 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 30 in the battery module 20 .

[0097] In the embodiments of the present application, the battery cells 30 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of the present application are not limited thereto. The battery cells 30 may be flat, rectangular, or in other shapes, and the embodiments of the present application are not limited thereto. However, for the sake of simplicity, the following embodiments will use a rectangular battery cell 30 as an example.

[0098] Figure 4 The partial exploded structure of the battery cell 30 is schematically shown. The battery cell 30 is the smallest unit constituting the battery device 10. Figure 4 As shown, the battery cell 30 includes an end cap 40 , a housing 50 and an electrode assembly 60 .

[0099] The end cap 40 refers to a component that covers the opening of the shell 50 to isolate the internal environment of the battery cell 30 from the external environment. Exemplarily, the shape of the end cap 40 can be adapted to the shape of the shell 50 to match the shell 50. Exemplarily, the end cap 40 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 40 is not easily deformed when squeezed or collided, so that the battery cell 30 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 41 can be provided on the end cap 40. The electrode terminal 41 can be used to electrically connect to the electrode assembly 60 for outputting or inputting electrical energy of the battery cell 30.

[0100] In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism 31 for releasing the internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold value. The end cap 40 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40. The insulating component may be used to isolate the electrical connection components in the housing 50 from the end cap 40 to reduce the risk of short circuits. For example, the insulating component may be plastic, rubber, etc.

[0101] The housing 50 is a component that cooperates with the end cap 40 to form an internal environment for the battery cell 30. This internal environment can be used to accommodate the electrode assembly 60, electrolyte (not shown), and other components. The housing 50 and the end cap 40 can be separate components. An opening can be provided in the housing 50, and the end cap 40 can be placed over the opening to form the internal environment for the battery cell 30. Alternatively, the end cap 40 and the housing 50 can be integrated. Specifically, the end cap 40 and the housing 50 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 50 needs to be encapsulated, the end cap 40 is placed over the housing 50. The housing 50 can be of various shapes and sizes, such as a rectangular parallelepiped or a hexagonal prism. Specifically, the shape of the housing 50 can be determined based on the specific shape and size of the electrode assembly 60. The housing 50 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0102] In some embodiments, a pressure relief mechanism 31 is provided on the outer shell of the battery cell 30. The pressure relief mechanism 31 is used to release the internal pressure of the battery cell 30. In some examples, the outer shell of the battery cell 30 may include an end cap 40 and a housing 50. The pressure relief mechanism 31 is provided on the end cap 40.

[0103] For example, when the internal pressure or temperature of a battery cell 30 reaches a predetermined threshold, the pressure relief mechanism 31 activates to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 30 reaches the predetermined threshold, the pressure relief mechanism 31 activates or a weakened structure within the pressure relief mechanism 31 is destroyed, thereby creating an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on design requirements. This threshold may depend on the materials of one or more of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell 30.

[0104] As an example, the pressure relief mechanism 31 may be integrally formed with the housing. For example, notches may be made on the housing to form a weak structure, and the weak structure serves as the pressure relief mechanism 31 .

[0105] The pressure relief mechanism 31 can also be separately provided and connected to the housing, for example, the pressure relief mechanism 31 is welded to the housing or connected via other components. As an example, a notch is provided on the pressure relief mechanism 31 to form a weak structure.

[0106] As an example, the pressure relief mechanism 31 may be in the form of an explosion-proof valve, a balancing valve, an air valve, a pressure relief valve, or a safety valve.

[0107] The "activation" mentioned in this application means that the pressure relief mechanism 31 produces an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 30 can be released. The action produced by the pressure relief mechanism 31 may include but is not limited to: the components in the pressure relief mechanism 31 move to form an exhaust channel, at least a part of the pressure relief mechanism 31 ruptures, breaks, is torn or opened, etc. When the pressure relief mechanism 31 is actuated, the high-temperature and high-pressure substances inside the battery cell 30 will be discharged outward from the actuated part as exhaust. In this way, the battery cell 30 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0108] The emissions from the battery cells 30 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, and the like.

[0109] Figure 5 A partial exploded structure of the battery device 10 is schematically shown. Figure 6 Schematic showing the partial structure of the fire protection assembly. Figure 3 、 Figure 5 and Figure 6 As shown, an embodiment of the present application provides a battery device 10. The battery device 10 includes a housing 10a, a battery cell 30, and a fire protection assembly 70.

[0110] The housing 10a includes a storage space. The battery cell 30 is disposed within the storage space of the housing 10a. The firefighting assembly 70 is disposed within the housing 10a. The firefighting assembly 70 includes a working fluid transmission component 71 and a heating component 72. The heating component 72 is disposed within the working fluid transmission component 71. The heating component 72 covers at least a portion of the working fluid transmission component 71. The working fluid transmission component 71 is used to transport a firefighting working fluid into the storage space. The heating component 72 is used to heat and vaporize the firefighting working fluid transported by the working fluid transmission component 71, so that the working fluid transmission component 71 discharges the gaseous firefighting working fluid into the storage space.

[0111] When the battery device 10 is in normal operation, the storage space of the box 10a is filled with air so that part of the heat generated by the battery cell 30 can be dissipated through the box 10a, and it is beneficial to maintain the pressure balance inside and outside the box 10a. When it is monitored that the operating state of the battery cell 30 reaches the thermal runaway condition, the heating component 72 can be started to heat the fire-fighting working fluid transported by the working fluid transmission component 71. The fire-fighting working fluid transported in the working fluid transmission component 71 is a liquid fire-fighting working fluid before being heated by the heating component 72. The heating component 72 can heat the fire-fighting working fluid in the working fluid transmission component 71 to vaporize the fire-fighting working fluid in the working fluid transmission component 71 and convert it from a liquid fire-fighting working fluid to a gaseous fire-fighting working fluid. After the fire-fighting working fluid is heated by the heating component 72, the working fluid transmission component 71 can discharge the gaseous fire-fighting working fluid into the storage space.

[0112] In some achievable embodiments, the operating state of the battery cell 30 reaching a thermal runaway condition may include but is not limited to a voltage signal reaching a preset runaway threshold, a temperature signal reaching a preset runaway threshold, or an air pressure signal reaching a preset runaway threshold.

[0113] In some feasible implementations, the firefighting fluid can have insulating properties, so that the firefighting fluid released into the containment space will not cause a short circuit in the high-voltage electrical circuit, reducing the possibility of secondary hazards such as high-voltage ignition. The density of the vaporized firefighting fluid is less than that of air, which facilitates the rapid filling of the containment space with the gaseous firefighting fluid.

[0114] In some examples, the firefighting fluid may include, but is not limited to, perfluorohexanone, ultrapure water, and fluorinated liquid. For example, the firefighting fluid may be perfluorohexanone. Perfluorohexanone has a relatively low boiling point, which facilitates rapid vaporization after heating, effectively shortening the vaporization time and improving fire extinguishing efficiency. Perfluorohexanone itself has good insulating properties, so the perfluorohexanone released into the accommodation space will not cause a short circuit in the high-voltage electrical circuit, reducing the possibility of secondary disasters such as high-voltage ignition. Perfluorohexanone itself is environmentally friendly and will not pollute the air or water.

[0115] The battery device 10 of the embodiment of the present application includes a housing 10a, a battery cell 30, and a firefighting assembly 70. The firefighting assembly 70 includes a fluid transmission component 71 and a heating component 72. The fluid transmission component 71 is used to deliver a firefighting fluid to the storage space. The heating component 72 is used to heat the firefighting fluid delivered by the fluid transmission component 71. If thermal runaway of the battery cell 30 is detected, the heating component 72 and the fluid transmission component 71 can be activated. The heating component 72 can heat the firefighting fluid in the fluid transmission component 71, converting the liquid firefighting fluid therein into a gaseous state. The fluid transmission component 71 can discharge the gaseous firefighting fluid into the storage space. The gaseous firefighting fluid can quickly fill the storage space of the housing 10a, creating an inert gas environment in a relatively short period of time. This reduces the oxygen concentration in the storage space, creating an oxygen-deficient environment for the combustible smoke, making it less likely to ignite, and thus ensuring the safety of the battery device 10.

[0116] In some possible implementations, see Figure 5 and Figure 6 As shown, the firefighting assembly 70 further includes a liquid tank 73. The liquid tank 73 can be used to store firefighting fluid. Because liquid firefighting fluid rapidly expands upon vaporization, the liquid tank 73 can store a relatively small volume of liquid firefighting fluid to meet firefighting needs. This helps reduce the volume of the liquid tank 73 itself and reduces the possibility of the liquid tank 73 occupying excessive space in the housing 10a. The liquid tank 73 can be connected to the fluid transmission component 71.

[0117] In some examples, the firefighting assembly 70 includes a control valve 74 and a delivery pipe 75. The working fluid transmission component 71 is connected to the control valve 74 through the delivery pipe 75. The liquid storage tank 73 is connected to the delivery pipe 75. The control valve 74 is used to open or close the delivery pipe 75. Exemplarily, the control valve 74 can be an electrically controlled valve. For example, the control valve 74 can be a solenoid valve. When the battery device 10 is in normal operation, the control valve 74 closes the delivery pipe 75, and the firefighting working fluid cannot be delivered to the working fluid transmission component 71 through the delivery pipe 75. When the battery cell 30 of the battery device 10 experiences thermal runaway, the control valve 74 opens the delivery pipe 75, and the firefighting working fluid can be delivered to the working fluid transmission component 71 through the delivery pipe 75.

[0118] Since the position of the working fluid transmission component 71 itself is sufficient to smoothly discharge the gaseous fire-fighting working fluid, the layout position of the working fluid transmission component 71 itself is flexible, so that the working fluid transmission component 71 can be selected to be relatively close to the liquid storage tank 73, so as to shorten the length of the delivery pipeline 75 and shorten the delivery distance of the fire-fighting working fluid, which is conducive to the fire-fighting working fluid being delivered to the working fluid transmission component 71 in a relatively short time, thereby improving the fire-fighting efficiency.

[0119] In some achievable embodiments, the heating component 72 is disposed on the working medium transmission component 71 , and the heating component 72 covers at least a portion of the working medium transmission component 71 .

[0120] The heating element 72 can be positioned near the working medium transmission element 71. Therefore, the heat generated by the heating element 72 can be transferred relatively quickly to the firefighting working medium in the working medium transmission element 71, thereby improving heating efficiency. Most of the heat generated by the heating element 72 can be transferred to the firefighting working medium in the working medium transmission element 71, thereby reducing heat loss, increasing the heating rate of the firefighting working medium, and improving heating efficiency.

[0121] In some examples, Figure 7 The partial cross-sectional structure of the fire protection assembly 70 is schematically shown. Figure 6 and Figure 7 As shown, the heating component 72 can cover the outer surface of the working fluid transmission component 71. The heating component 72 can heat the working fluid transmission component 71. The working fluid transmission component 71 transfers heat to the firefighting working fluid to heat the firefighting working fluid. The arrangement of the heating component 72 outside the working fluid transmission component 71 makes the arrangement of the heating component 72 relatively easy, which helps to reduce the difficulty of assembling the heating component 72 and the working fluid transmission component 71. For example, the heating component 72 can completely cover the outer surface of the working fluid transmission component 71, further improving the heating efficiency.

[0122] In some feasible embodiments, the heating component 72 is a cylindrical structure having a through hole. At least a portion of the working fluid transmission component 71 is accommodated in the through hole. The portion of the working fluid transmission component 71 located in the through hole is covered by the heating component 72. The heating component 72 can heat the fire-fighting working fluid in the working fluid transmission component 71 along the entire circumference of the working fluid transmission component 71. On the one hand, it is beneficial for the fire-fighting working fluid in the working fluid transmission component 71 to be heated evenly and to have a balanced vaporization effect; on the other hand, most of the heat generated by the heating component 72 can be used to conduct the fire-fighting working fluid in the working fluid transmission component 71, which is beneficial for reducing heat loss, increasing the heating rate of the fire-fighting working fluid, and improving the heating efficiency.

[0123] For example, the working medium transmission component 71 is entirely accommodated in the through hole of the heating component 72. The heating component 72 completely covers the outer surface of the working medium transmission component 71, further improving the heating efficiency and enhancing the heating effect.

[0124] Illustratively, the heating component 72 comprises a heating film. The heating film can be rolled into a cylindrical structure having a through hole. At least a portion of the working fluid transmission component 71 is accommodated within the through hole. The heating film can be easily designed to match the surface contour of the working fluid transmission component 71, thereby simplifying the installation of the heating component 72 on the working fluid transmission component 71.

[0125] Illustratively, the heating component 72 comprises a heating wire. The heating wire can be spirally wound to form a cylindrical structure having a through hole. At least a portion of the working fluid transmission component 71 is accommodated within the through hole. The heating wire can be easily designed to match the surface contour of the working fluid transmission component 71, thereby reducing the difficulty of installing the heating component 72 on the working fluid transmission component 71.

[0126] In some achievable ways, Figure 8 The partial cross-sectional structure of the fire protection assembly 70 is schematically shown. Figure 8 As shown, the heating component 72 is provided on the inner surface of the medium transmission component 71 for contacting the fire-fighting medium. The medium transmission component 71 includes a channel 71a for conveying the fire-fighting medium. The inner surface of the medium transmission component 71 faces the channel 71a.

[0127] When the firefighting medium is transported within the channel 71a of the medium transmission component 71, the heating component 72 can come into direct contact with the firefighting medium. The heat generated by the heating component 72 can be directly transferred to the firefighting medium, thereby effectively improving the heating efficiency of the firefighting medium and shortening the vaporization time of the firefighting medium, allowing the firefighting medium to be converted from liquid to gas relatively quickly. The arrangement of the heating component 72 on the inner surface of the medium transmission component 71 allows, on the one hand, most of the heat generated by the heating component 72 to be transferred to the firefighting medium, thereby reducing heat loss. On the other hand, the medium transmission component 71 can protect the heating component 72, reducing the possibility of damage and failure of the heating component 72 due to collisions or scrapes with other structural components. Furthermore, when a battery cell 30 experiences thermal runaway, the combustible smoke emitted by the battery cell 30 has a significant impact force. The medium transmission component 71 can effectively block this impact force from impacting the heating component 72, thereby reducing the possibility of damage and failure of the heating component 72 due to impact.

[0128] In some examples, a through hole 71b is provided on the working medium transmission component 71. The electrode lead of the heating component 72 can pass through the through hole 71b. The through hole 71b is sealed with a sealant to prevent leakage of the fire-fighting working medium.

[0129] In some examples, the heating component 72 includes a heating film. The heating film can be rolled into a cylindrical structure with a through hole. The heating film is attached to the inner surface of the working fluid transmission component 71. Alternatively, the heating component 72 includes a heating wire. The heating wire can be spirally wound to form a cylindrical structure with a through hole. The firefighting working fluid in the working fluid transmission component 71 can pass through the through hole, and the heating component 72 can heat the firefighting working fluid in the working fluid transmission component 71 along the entire circumference, which facilitates uniform heating of the firefighting working fluid in the working fluid transmission component 71 and a balanced vaporization effect.

[0130] In some possible implementations, see Figure 8As shown, the working medium transmission component 71 includes a delivery pipe 711 and a nozzle portion 712 connected to each other. The heating component 72 is provided on the delivery pipe 711. The nozzle portion 712 is used to discharge the fire-fighting working medium into the accommodation space.

[0131] The firefighting working medium in the working medium transmission component 71 flows from the delivery pipe 711 to the nozzle portion 712. The heating component 72 heats the firefighting working medium in the delivery pipe 711, allowing the vaporized firefighting working medium to enter the nozzle portion 712 for buffering and ultimately be discharged into the storage space of the housing 10a through the nozzle portion 712. Heating the firefighting working medium in the delivery pipe 711 by the heating component 72 helps ensure that the firefighting working medium is completely vaporized before entering the nozzle portion 712, reducing the possibility of liquid firefighting working medium remaining in the nozzle portion 712 and affecting the discharge efficiency of the gaseous firefighting working medium.

[0132] In some examples, the delivery tube 711 may be a cylindrical tube. The nozzle portion 712 may be a tapered tube. For example, the heating component 72 may include a heating film. The heating film may be rolled into a cylindrical structure having a through hole. The delivery tube 711 is accommodated within the through hole. For example, the heating component 72 may include a heating wire. The heating wire may be spirally wound to form a cylindrical structure having a through hole. The delivery tube 711 may be inserted into the through hole.

[0133] In some achievable ways, Figure 9 The partial structure of the fire protection assembly 70 is schematically shown. Figure 9 As shown, the firefighting assembly 70 includes a temperature detector 76. The temperature detector 76 is used to detect the temperature of at least one of the working medium transmission component 71 and the firefighting working medium.

[0134] The temperature signal collected by temperature detector 76 can be used to determine whether the current temperature is sufficient to ensure the successful vaporization of the liquid firefighting medium. If the current temperature is determined to be low, the heating power of heating element 72 needs to be increased to raise the heating temperature of heating element 72 and ensure the successful vaporization of the liquid firefighting medium. If the current temperature is determined to be high, the heating power of heating element 72 needs to be reduced to reduce energy loss.

[0135] In some examples, the temperature detector 76 is disposed on the outside of the working fluid transmission component 71. The temperature detector 76 is used to detect the temperature of the working fluid transmission component 71. The heating component 72 is disposed on the outside of the working fluid transmission component 71. When the heating component 72 heats the fire-fighting working fluid in the working fluid transmission component 71, the working fluid transmission component 71 absorbs the heat of the heating component 72 and its own temperature rises. The working fluid transmission component 71 then transfers the heat to the fire-fighting working fluid to heat the fire-fighting working fluid. Alternatively, the heating component 72 is disposed on the inner surface of the working fluid transmission component 71. When the heating component 72 heats the fire-fighting working fluid in the working fluid transmission component 71, the heat of the fire-fighting working fluid is transferred to the working fluid transmission component 71 to increase the temperature of the working fluid transmission component 71. The temperature signal collected by the temperature detector 76 can be used to determine whether the current temperature can ensure that the liquid fire-fighting working fluid is successfully vaporized.

[0136] The temperature detector 76 is arranged outside the working fluid transmission component 71 , which makes it relatively easy to arrange the temperature detector 76 , and helps to reduce the difficulty of assembling the temperature detector 76 and the working fluid transmission component 71 .

[0137] In some examples, Figure 10 The partial cross-sectional structure of the fire protection assembly 70 is schematically shown. Figure 10 As shown, the working medium transmission component 71 includes a channel 71a for conveying the fire-fighting working medium. At least a portion of a temperature detector 76 is disposed within the channel 71a. The temperature detector 76 is used to detect the temperature of the fire-fighting working medium. For example, the temperature detector 76 is entirely disposed within the channel 71a.

[0138] The temperature detector 76 can directly detect the temperature of the fire-fighting fluid, which can help improve detection accuracy and reduce the possibility of misjudgment. In addition, when the battery cell 30 experiences thermal runaway, the temperature in the storage space will increase. Since the temperature detector 76 is arranged in the channel 71a of the working fluid transmission component 71, the working fluid transmission component 71 can isolate the heat released by the battery cell 30 for a period of time, thereby effectively preventing the heat released by the battery cell 30 from contacting the temperature detector 76, thereby helping to reduce the possibility of the temperature detector 76 being affected by the heat released by the battery cell 30, causing the temperature detector 76 to be distorted and causing misjudgment, thereby ensuring that the temperature signal detected by the temperature detector 76 can still accurately determine whether the current temperature can ensure that the liquid fire-fighting fluid is successfully vaporized. If the temperature detector 76 is affected by the heat released by the battery cell 30, the temperature detector 76 detects that the current temperature is too high, resulting in a reduction in the heating power of the heating component 72, which in turn causes the temperature of the fire-fighting fluid to be too low and fail to successfully complete vaporization, affecting the fire extinguishing effect.

[0139] In some examples, the temperature detector 76 has a detection portion. The detection portion of the temperature detector 76 is located in the channel 71 a.

[0140] In some examples, a through hole 71b is provided on the working medium transmission component 71. A wire of the temperature detector 76 can pass through the through hole 71b. The through hole 71b is sealed with a sealant to prevent leakage of the fire-fighting working medium.

[0141] In some examples, the temperature detector 76 may include, but is not limited to, a thermistor sensor, a thermocouple sensor.

[0142] In some examples, Figure 11 The partial cross-sectional structure of the fire protection assembly 70 is schematically shown. Figure 11 As shown, the fire protection assembly 70 includes a thermal insulation component 77. The thermal insulation component 77 includes a receiving cavity 771. At least a portion of the working fluid transmission component 71, at least a portion of the heating component 72, and at least a portion of the temperature detector 76 are located within the receiving cavity 771. For example, the thermal insulation component 77 can be disposed in the gaps between the working fluid transmission component 71, the heating component 72, and the temperature detector 76 and the battery cells 30.

[0143] The thermal insulation component 77 provides protection for the working fluid transmission component 71, the heating component 72, and the temperature detector 76. When a battery cell 30 experiences thermal runaway, it releases heat, raising the temperature within the storage space. The thermal insulation component 77 effectively isolates the heat released by the thermally runaway battery cell 30, effectively preventing the heat released by the battery cell 30 from contacting at least one of the working fluid transmission component 71, the heating component 72, and the temperature detector 76.

[0144] The heat insulating component 77 can effectively prevent the heat released by the battery cells 30 from contacting the working fluid transmission component 71 , thereby helping to reduce the possibility of the working fluid transmission component 71 being damaged or failing due to the heat released by the battery cells 30 .

[0145] The heat insulating component 77 can effectively prevent the heat released by the battery cells 30 from contacting the heating component 72 , thereby helping to reduce the possibility of the heating component 72 being damaged or failing due to the heat released by the battery cells 30 .

[0146] The heat insulating component 77 can effectively prevent the heat released by the battery cell 30 from contacting the temperature detector 76 , thereby helping to reduce the possibility that the temperature detector 76 is affected by the heat released by the battery cell 30 and causes distortion in the temperature detector 76 and misjudgment.

[0147] Since the fire-fighting working fluid discharged by the working fluid transmission component 71 is in gaseous state, the thermal insulation component 77 is not easy to prevent the gaseous fire-fighting working fluid from diffusing in the accommodating space of the box body 10a, so the structural design requirements of the thermal insulation component 77 itself are relatively low, reducing the processing difficulty of the thermal insulation component 77.

[0148] For example, the thermal insulation component 77 may include, but is not limited to, a fiberglass board and a polyurethane foam board.

[0149] Illustratively, the heat insulating member 77 may be a cylindrical structure.

[0150] In some implementations, the battery cell 30 includes a pressure relief mechanism 31. The working fluid transmission component 71, the heating component 72, and the temperature detector 76 are all disposed on the side of the battery cell 30 facing away from the pressure relief mechanism 31. If thermal runaway occurs in the battery cell 30 and the internal pressure or temperature of the battery cell 30 reaches a threshold, the pressure relief mechanism 31 opens to release the internal pressure of the battery cell 30. Combustible fumes can be ejected through the pressure relief mechanism 31 into the storage space of the housing 10a.

[0151] Since the working fluid transmission component 71, the heating component 72 and the temperature detector 76 are all arranged on the side of the battery cell 30 facing away from the pressure relief mechanism 31, when the pressure relief mechanism 31 opens to release the internal pressure of the battery cell 30, the high-temperature substance discharged by the pressure relief mechanism 31 will not directly impact the working fluid transmission component 71, the heating component 72 and the temperature detector 76, thereby helping to reduce the possibility of structural damage or failure of the working fluid transmission component 71, the heating component 72 and the temperature detector 76 due to high temperature impact.

[0152] In some examples, the pressure relief mechanism 31 of the battery cell 30 is disposed toward the bottom plate of the box body 10 a . The working medium transmission component 71 and the temperature detector 76 are both disposed between the top plate of the box body 10 a and the battery cell 30 .

[0153] In some achievable ways, Figure 12 The partial structure of the fire protection assembly 70 is schematically shown. Figure 12 As shown, firefighting assembly 70 includes a control valve 74, a delivery pipeline 75, and a thermal runaway signal collector 78. The working fluid transmission component 71 is connected to the control valve 74 via the delivery pipeline 75. The control valve 74 is used to open or close the delivery pipeline 75. Firefighting assembly 70 includes a thermal runaway signal collector 78. The thermal runaway signal collector 78 is in communication with the control valve 74.

[0154] The thermal runaway signal collector 78 can collect a signal representing the current state of the battery cell 30. The thermal runaway signal collector 78 can collect at least one of a voltage signal and a temperature signal of the battery cell 30. The thermal runaway signal collector 78 can also collect an air pressure signal of the accommodation space.

[0155] The operating state of the battery cell 30 reaching a thermal runaway condition may include but is not limited to a voltage signal reaching a preset runaway threshold, a temperature signal reaching a preset runaway threshold, or an air pressure signal reaching a preset runaway threshold.

[0156] When at least one of the voltage signal, temperature signal and air pressure signal collected by the thermal runaway signal collector 78 reaches the preset runaway threshold, it can be accurately determined that the battery cell 30 has thermal runaway. The control valve 74 is an electrically controlled valve. When it is determined that the battery cell 30 has thermal runaway, the control valve 74 can automatically open to connect the delivery pipe 75. The fire-fighting working fluid can be delivered to the working fluid transmission component 71 through the delivery pipe 75. At the same time, the heating component 72 that is started can heat the fire-fighting working fluid to convert the liquid fire-fighting working fluid into a gaseous fire-fighting working fluid. The working fluid transmission component 71 discharges the gaseous fire-fighting working fluid into the accommodating space of the box body 10a.

[0157] In some examples, thermal runaway signal collector 78 may include at least one of a voltage detection sensor, a temperature sensor, and an air pressure sensor. The voltage detection sensor may include a resistive voltage sensor, a transformer voltage sensor, or a capacitive voltage sensor. The temperature sensor may include a thermistor sensor or a thermocouple. The air pressure sensor may include a resistive strain gauge air pressure sensor or a thin film capacitive pressure sensor.

[0158] In some examples, the fire protection assembly 70 includes a thermal runaway warning signal collector 79 . The thermal runaway warning signal collector 79 is in communication with the control valve 74 .

[0159] When a battery cell 30 experiences thermal runaway, thermal runaway has already occurred inside the battery cell 30 before the pressure relief mechanism 31 of the battery cell 30 opens. When the internal pressure or temperature of the battery cell 30 reaches a threshold, the pressure relief mechanism 31 opens to release the internal pressure of the battery cell 30. Combustible fumes can be ejected into the storage space of the housing 10a through the pressure relief mechanism 31.

[0160] Before the pressure relief mechanism 31 of the battery cell 30 is opened, the thermal runaway warning signal collector 79 can collect a signal indicating that thermal runaway has occurred inside the battery cell 30. The control valve 74 can be opened automatically to connect the delivery pipe 75. The fire-fighting working fluid can be delivered to the working fluid transmission component 71 through the delivery pipe 75. At the same time, the heating component 72 that is started can heat the fire-fighting working fluid to convert the liquid fire-fighting working fluid into a gaseous fire-fighting working fluid. The working fluid transmission component 71 discharges the gaseous fire-fighting working fluid into the accommodation space of the box body 10a, thereby forming an inert gas environment in the accommodation space in advance, and then when the pressure relief mechanism 31 of the battery cell 30 is opened to spray out the combustible smoke, the combustible smoke is in an oxygen-deficient environment, so that the combustible smoke is not easy to burn, thereby ensuring the safety of the battery device 10.

[0161] For example, the voltage of the battery cell 30 may change before the pressure relief mechanism 31 of the battery cell 30 opens. The thermal runaway warning signal collector 79 can collect the voltage signal of the battery cell 30. When the voltage signal collected by the thermal runaway warning signal collector 79 reaches a preset runaway threshold, it can be determined that thermal runaway has occurred within the battery cell 30.

[0162] In some examples, the thermal runaway warning signal collector 79 may include a voltage detection sensor, which may include a resistive voltage sensor, a transformer voltage sensor, or a capacitive voltage sensor.

[0163] In some possible implementations, see Figure 12 As shown, the fire protection assembly 70 includes a power switch 701 and a power supply 702. The heating component 72 and the power supply 702 are electrically connected to the power switch 701. The power switch 701 is used to connect the heating component 72 and the power supply 702 or to disconnect the heating component 72 and the power supply 702.

[0164] When the battery device 10 is in normal operation, the power switch 701 disconnects the heating component 72 from the power source 702. The heating component 72 is not powered. When the battery cell 30 reaches a thermal runaway condition, the power switch 701 can connect the heating component 72 to the power source 702, activating the heating component 72 to heat the firefighting fluid being delivered by the fluid delivery component 71.

[0165] The power supply 702 can be an independent power supply. In the event of thermal runaway of the battery cell 30, the power supply 702 is not easily affected and can still maintain normal operation, which helps to reduce the possibility of the heating component 72 being unable to start due to the power supply 702 being affected, and ensures the good working reliability of the fire protection assembly 70.

[0166] The power source 702 includes a battery cell 30. The firefighting assembly 70 can directly use the power provided by the battery cells 30 within the housing 10a to power the heating element 72. Therefore, the firefighting assembly 70 does not require a separate power source, which helps save space within the housing 10a and improves the energy density of the battery device 10.

[0167] In some examples, the fire protection component 70 includes a thermal runaway warning signal collector 79. The thermal runaway warning signal collector 79 is in communication with a power switch 701. The power switch 701 is an electrically controlled switch.

[0168] Before the pressure relief mechanism 31 of the battery cell 30 opens, the thermal runaway warning signal collector 79 can collect a signal indicating that thermal runaway has occurred within the battery cell 30. The power switch 701 can connect the heating component 72 and the power supply 702 to activate the heating component 72 to heat the firefighting working fluid transported by the working fluid transmission component 71, thereby converting the liquid firefighting working fluid into a gaseous firefighting working fluid. The working fluid transmission component 71 discharges the gaseous firefighting working fluid into the storage space of the box body 10a, thereby preemptively forming an inert gas environment within the storage space. When the pressure relief mechanism 31 of the battery cell 30 opens to discharge the combustible smoke, the combustible smoke is in an oxygen-deficient environment, making it less likely for the combustible smoke to ignite, thereby ensuring the safety of the battery device 10.

[0169] In some implementations, the fire protection assembly 70 may be disposed in the housing 10 a or in the space between the housing 10 a and the battery cells 30 .

[0170] An embodiment of the present application further provides an electrical device, comprising the battery device 10 of any of the above solutions, and the battery device 10 is used to provide electrical energy to the electrical device.

[0171] The power-consuming device may be any of the aforementioned devices or systems using the battery device 10 .

[0172] The present embodiment further provides a method for using the battery device 10, including:

[0173] Monitoring the operating status of the battery cell 30;

[0174] When it is monitored that the operating state of the battery cell 30 reaches the thermal runaway condition, the heating component 72 is started to heat the fire-fighting working medium transported by the working medium transmission component 71, and the working medium transmission component 71 discharges the gaseous fire-fighting working medium into the accommodation space.

[0175] The method of using the battery device 10 of the embodiment of the present application can start the heating component 72 and the working fluid transmission component 71 when it is detected that the battery cell 30 has thermal runaway. The heating component 72 can heat the fire-fighting working fluid in the working fluid transmission component 71 to convert the liquid fire-fighting working fluid in the working fluid transmission component 71 into a gaseous fire-fighting working fluid. The working fluid transmission component 71 can discharge the gaseous fire-fighting working fluid into the storage space. The gaseous fire-fighting working fluid can quickly fill the storage space of the box 10a, so that the storage space forms an inert gas environment in a relatively short time, thereby reducing the oxygen concentration in the storage space, so that the combustible smoke is in an oxygen-deficient environment, and the combustible smoke is not easy to burn, thereby ensuring the safety of the battery device 10.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. 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. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, including a receiving space; A battery cell is disposed in the accommodation space; A fire-fighting component is arranged in the box body, and the fire-fighting component includes a working fluid transmission component and a heating component. The heating component is arranged in the working fluid transmission component, and the heating component covers at least a portion of the working fluid transmission component. The working fluid transmission component is used to transport the fire-fighting working fluid to the accommodating space, and the heating component is used to heat and vaporize the fire-fighting working fluid transported by the working fluid transmission component so that the working fluid transmission component discharges the gaseous fire-fighting working fluid into the accommodating space.

2. The battery device according to claim 1, wherein: The heating component is a cylindrical structure having a through hole, and at least a portion of the working medium transmission component is accommodated in the through hole.

3. The battery device according to claim 1, wherein: The heating component is arranged on the inner surface of the working medium transmission component for contacting the fire-fighting working medium.

4. The battery device according to claim 1, wherein: The working medium transmission component includes a delivery pipe and a nozzle part that are connected to each other. The heating component is arranged on the delivery pipe. The nozzle part is used to discharge the fire-fighting working medium into the accommodating space.

5. The battery device according to any one of claims 1 to 4, characterized in that: The heating component includes a heating film or a heating wire.

6. The battery device according to any one of claims 1 to 5, characterized in that: The fire-fighting component includes a temperature detector, which is used to detect the temperature of at least one of the working medium transmission component and the fire-fighting working medium.

7. The battery device according to claim 6, characterized in that The temperature detector is arranged outside the working medium transmission component; or, The working medium transmission component includes a channel for conveying the fire-fighting working medium, and at least part of the temperature detector is arranged in the channel.

8. The battery device according to claim 6, characterized in that The fire protection assembly includes a heat insulation component, and the heat insulation component includes a receiving cavity. At least part of the working medium transmission component, at least part of the heating component, and at least part of the temperature detector are located in the receiving cavity.

9. The battery device according to any one of claims 6 to 8, characterized in that: The battery cell includes a pressure relief mechanism, and the working medium transmission component, the heating component and the temperature detector are all arranged on a side of the battery cell facing away from the pressure relief mechanism.

10. The battery device according to any one of claims 1 to 9, characterized in that: The fire protection component includes a control valve, a delivery pipeline and a thermal runaway signal collector. The working fluid transmission component is connected to the control valve through the delivery pipeline. The control valve is used to open or close the delivery pipeline. The thermal runaway signal collector is communicatively connected to the control valve.

11. The battery device according to claim 10, characterized in that The fire protection component includes a thermal runaway warning signal collector, and the thermal runaway warning signal collector is communicatively connected to the control valve.

12. The battery device according to any one of claims 1 to 11, characterized in that: The fire-fighting component includes a power switch and a power supply. The heating component and the power supply are electrically connected to the power switch respectively. The power switch is used to connect the heating component and the power supply or to disconnect the heating component and the power supply. The power supply is an independent power supply, or the power supply includes the battery cell.

13. The battery device according to claim 12, characterized in that The fire protection component includes a thermal runaway warning signal collector, and the thermal runaway warning signal collector is communicatively connected to the power switch.

14. An electrical device, characterized in that: The battery device according to any one of claims 1 to 13 is used to provide electrical energy.

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