Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer, a box body, a second pressure relief mechanism and at least two filtering pieces, the battery monomer is provided with a first pressure relief mechanism, the box body is provided with a containing cavity, the battery monomer is contained in the containing cavity, the box body is provided with an exhaust channel, and the exhaust channel is communicated with the containing cavity. The second pressure relief mechanism is arranged in the box body, and the exhaust channel is configured to guide emissions discharged by the first pressure relief mechanism to the second pressure relief mechanism so as to be discharged out of the box body. The at least two filtering pieces are arranged in the exhaust channel, the at least two filtering pieces are arranged at intervals in the extending direction of the exhaust channel, and the filtering pieces are configured to be capable of filtering particles in emissions. According to the battery device provided by the embodiment of the invention, the content of harmful substances in emissions discharged into the environment under the condition of thermal runaway of the battery device is reduced, so that the pollution to the environment is reduced.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, the environmental friendliness of battery devices in the case of thermal runaway is also an issue that needs to be considered. Therefore, in the case of thermal runaway of battery devices, how to reduce the pollution of emissions to the environment is an issue of continuous improvement in battery device technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device to improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, the battery device provided by the embodiment of the present application includes a battery cell, a housing, a second pressure relief mechanism and at least two filters, the battery cell has a first pressure relief mechanism, the housing has a receiving cavity, the battery cell is received in the receiving cavity, the housing has an exhaust passage, and the exhaust passage is connected to the receiving cavity. The second pressure relief mechanism is provided in the housing, and the exhaust passage is configured to guide the emissions discharged by the first pressure relief mechanism to the second pressure relief mechanism to be discharged from the housing. At least two filters are provided in the exhaust passage, and at least two filters are spaced apart along the extension direction of the exhaust passage, and the filter is configured to filter particles in the emissions.

[0007] The battery device provided in the embodiment of the present application is provided with at least two filters in the exhaust channel, so that in the case of thermal runaway of the battery device, the exhaust flows through the filter at least twice during the process of the exhaust channel, so as to filter the particles in the exhaust at least twice. This is conducive to reducing the risk of excessive deposition of particles in the exhaust at the filter and causing the exhaust channel to be blocked, and is conducive to reducing the content of particles in the exhaust discharged into the environment, thereby helping to reduce the pollution to the environment in the case of thermal runaway of the battery device.

[0008] According to some embodiments of the present application, at least two of the filter elements include at least two filter screens, and the at least two filter screens are spaced apart along an extension direction of the exhaust passage.

[0009] In the above scheme, by providing the filter element including a filter screen, it is helpful to simplify the structure of the filter element, and it is convenient to control the particle size of the particles filtered by the filter element, which is helpful to improve the efficiency of the filter element in filtering particles in emissions.

[0010] According to some embodiments of the present application, at least two filters include a first filter and a second filter. Along the extension direction of the exhaust channel, the first filter is arranged on a side of the second filter close to the second pressure relief mechanism, and the mesh number of the first filter is greater than the mesh number of the second filter.

[0011] In the above scheme, by setting the mesh number of the first filter to be larger than the mesh number of the second filter, the larger particles in the emissions are filtered out first when the emissions flow through the exhaust channel. This is beneficial to improving the filtering efficiency of the filter for particles in the emissions, while also helping to reduce the risk of excessive accumulation of particles on the filter and causing the exhaust channel to be blocked.

[0012] According to some embodiments of the present application, at least two filter elements include at least three filter screens, and the at least three filter screens are arranged at intervals along the extension direction of the exhaust channel. Along the extension direction of the exhaust channel, the mesh size of the filter screens increases successively from the side of the exhaust channel close to the accommodating chamber to the side close to the second pressure relief mechanism.

[0013] In the above scheme, at least three levels of filters are provided, and the mesh size of the filters increases successively from the side of the exhaust channel close to the accommodating chamber to the side close to the second pressure relief mechanism, which is beneficial to increase the total amount of particles filtered out of the emissions, so as to improve the filtering efficiency of the filters on the emissions, and is also beneficial to reduce the risk of the exhaust channel being blocked due to the accumulation of particles at the filters, and is beneficial to improve the smoothness of the emission discharge in the event of thermal runaway of the battery device.

[0014] According to some embodiments of the present application, along the extension direction of the exhaust passage, of any two adjacent filter screens, one close to the second pressure relief mechanism has a mesh size of A1, and the other has a mesh size of A2, and 2≤A1 / A2≤30.

[0015] In the above solution, by setting 2≤A1 / A2≤30, it is beneficial to reduce the risk of the exhaust passage being blocked and to increase the weight of the particles filtered by the filter.

[0016] According to some embodiments of the present application, 2≤A1 / A2≤20.

[0017] In the above solution, setting 2≤A1 / A2≤20 is beneficial to further reduce the risk of the exhaust passage being blocked, and is also beneficial to further increase the weight of particles filtered by the filter.

[0018] According to some embodiments of the present application, a distance d between any two adjacent filter screens along the extension direction of the exhaust passage satisfies: d≥0.5 m.

[0019] In the above scheme, by setting d≥0.5m, it is helpful to improve the smoothness of exhaust in the exhaust channel and reduce the risk of the exhaust channel being blocked.

[0020] According to some embodiments of the present application, d≥1m.

[0021] In the above scheme, by setting d≥1m, it is beneficial to further improve the smoothness of exhaust in the exhaust channel and further reduce the risk of the exhaust channel being blocked.

[0022] According to some embodiments of the present application, the filter is connected to the inner wall of the exhaust passage by welding, bonding or snapping.

[0023] In the above scheme, by setting a welding connection, adhesive connection or snap connection between the filter and the inner wall of the exhaust channel, the connection between the filter and the inner wall of the exhaust channel is facilitated and the reliability of the connection between the filter and the inner wall of the exhaust channel is improved.

[0024] According to some embodiments of the present application, the battery cell is a ternary battery cell.

[0025] In the above scheme, the ternary battery cell has a higher energy density, and the chemical reaction it produces in the case of thermal runaway is more violent, and the content of particles in the discharged emissions is higher. By arranging at least two filters in the exhaust channel, it is beneficial to give full play to the filtering effect of the filter element, reduce the risk of excessive deposition of particles in the emissions on the filter element and causing the exhaust channel to be blocked, and help reduce the content of particles in the emissions discharged into the environment, thereby helping to reduce the pollution to the environment in the case of thermal runaway of the battery device.

[0026] According to some embodiments of the present application, the box body includes a frame, the frame is arranged to form a containing cavity, and at least a portion of the exhaust passage is arranged in the frame.

[0027] In the above solution, without affecting the structural strength of the box, it is helpful to simplify the structure of the box, thereby reducing the production cost of the battery device.

[0028] According to some embodiments of the present application, the exhaust channel includes multiple flow channels, the frame forms a hollow cavity, the box body also includes a partition, the partition is arranged in the hollow cavity, the partition divides the hollow cavity into multiple flow channels, the multiple flow channels are connected end to end in sequence, and at least one filter element is arranged in any flow channel.

[0029] In the above scheme, by arranging multiple flow channels in the hollow cavity of the frame, and arranging multiple flow channels to be connected end to end in sequence, and at least one filter element is arranged in any flow channel, it is beneficial to further improve the treatment efficiency of emissions, increase the content of particulate matter deposited and retained in the exhaust channel, further reduce the pollution of the environment by emissions, and help reduce the risk of the exhaust channel being blocked.

[0030] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments.

[0031] The electric device provided in the embodiment of the present application has the same technical effect as the battery device provided in the above embodiment, and thus will not be described in detail here.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0036] Figure 3 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the structure of a box in a battery device provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of a part of the structure of the battery device provided in an embodiment of the present application;

[0039] Figure 6 A top view of a portion of the structure of a battery device provided in an embodiment of the present application;

[0040] Figure 7 A top view of a battery device provided in an embodiment of the present application;

[0041] Figure 8 for Figure 7Schematic diagram of the cross-sectional structure along AA, where the arrows indicate the flow direction of the emissions.

[0042] In the drawings, the figures are not necessarily drawn to scale.

[0043] Description of reference numerals:

[0044] 1- Vehicle;

[0045] 10-battery device; 11-box; 11a-accommodation cavity; 11b-exhaust channel; 111b-flow channel; 111-first sub-box; 112-second sub-box; 113-frame; 113a-hollow cavity; 113b-air inlet; 113c-air outlet; 114-partition; 1a-motor; 1b-controller;

[0046] 20-battery monomer assembly;

[0047] 30 - battery cell; 31 - shell; 311 - housing; 312 - end cover; 32 - electrode assembly; 321 - electrode body; 322 - pole ear; 33 - electrode terminal; 34 - first pressure relief mechanism;

[0048] 40- second pressure relief mechanism;

[0049] 50 - filter element; 51 - filter screen; 51a - first filter screen; 51b - second filter screen. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0052] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0055] The term "multiple" as used in the present application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0056] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0057] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0058] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0059] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0060] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0061] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0062] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0063] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0064] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0065] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0066] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0067] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0068] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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.).

[0069] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0070] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0071] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel or titanium.

[0072] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0073] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0074] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0075] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0076] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0077] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0078] In some embodiments, the electrode assembly is a laminate structure.

[0079] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0080] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0081] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0082] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0083] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0084] In the case of thermal runaway of the battery device, the battery cells release emissions into the battery device box. As the thermal runaway of the battery device spreads, a large amount of emissions accumulate in the box and are discharged to the outside of the box through the relevant exhaust channels. The emissions of the battery device usually contain a large number of pollutants, which will be discharged into the environment outside the battery device along with the emissions, thus causing certain pollution to the environment.

[0085] In view of this, the battery device provided in the embodiment of the present application includes a battery cell, a housing, a second pressure relief mechanism and at least two filters, the battery cell has a first pressure relief mechanism, the housing has a receiving cavity, the battery cell is received in the receiving cavity, the housing has an exhaust channel, and the exhaust channel is connected to the receiving cavity. The second pressure relief mechanism is arranged in the housing, and the exhaust channel is configured to guide the emissions discharged by the first pressure relief mechanism to the second pressure relief mechanism for discharge. At least two filters are arranged in the exhaust channel, and at least two filters are arranged at intervals along the extension direction of the exhaust channel, and the filter is configured to filter at least part of the particles in the emissions.

[0086] The battery device provided in the embodiment of the present application is provided with at least two filters in the exhaust channel, so that in the case of thermal runaway of the battery device, the exhaust flows through the filter at least twice during the process of the exhaust channel, so as to filter the particles in the exhaust at least twice. This is conducive to reducing the risk of excessive deposition of particles in the exhaust at the filter and causing the exhaust channel to be blocked, and is conducive to reducing the content of particles in the exhaust discharged into the environment, thereby helping to reduce the pollution to the environment in the case of thermal runaway of the battery device.

[0087] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0088] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical device.

[0089] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0090] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0091] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0092] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0093] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve 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 .

[0094] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3 A schematic diagram of the structure of a battery cell assembly 20 in a battery device 10 provided in an embodiment of the present application. The battery device 10 includes a housing 11 and a battery cell 30, and the battery cell 30 is accommodated in the housing 11. The housing 11 is used to provide a storage space for the battery cell 30, and the housing 11 can adopt a variety of structures. In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, and the first sub-housing 111 and the second sub-housing 112 cover each other, and the first sub-housing 111 and the second sub-housing 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0095] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery device 10 may also be a battery cell assembly 20 in which multiple battery cells 30 are first connected in series, in parallel, or in a mixed connection, and then the multiple battery cell assemblies 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0096] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0097] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. Figure 4As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0098] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0099] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0100] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tabs 322. The positive tab and the negative tab may be located together at one end of the electrode body 321 or at both ends of the electrode body 321, respectively. During the charge and discharge process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0101] In some embodiments, a first pressure relief mechanism 34 is disposed on the housing 31 , and the first pressure relief mechanism 34 is used to release the internal pressure of the battery cell 30 .

[0102] As an example, when the internal pressure or temperature of the battery cell 30 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 30 reaches a predetermined threshold, the first pressure relief mechanism 34 performs an action or a weak structure provided in the first pressure relief mechanism 34 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, the negative electrode plate, the electrolyte and the separator in the battery cell 30.

[0103] As an example, the first pressure relief mechanism 34 may be integrally formed with the housing 31 . For example, a notch is made on the housing 31 to form a weak structure, and the weak structure serves as the first pressure relief mechanism 34 .

[0104] The first pressure relief mechanism 34 may also be separately provided and connected to the housing 31. For example, the first pressure relief mechanism 34 is welded or connected to the housing 31 through other components. As an example, a notch is provided on the first pressure relief mechanism 34 to form a weak structure.

[0105] As an example, the first pressure relief mechanism 34 may be in the form of an explosion-proof valve, a balancing valve, a gas valve, a pressure relief valve, or a safety valve.

[0106] After the first pressure relief mechanism 34 of the battery cell 30 is actuated, the discharged exhaust will enter the accommodating chamber 11a. When the air pressure in the accommodating chamber 11a reaches the pressure relief threshold of the second pressure relief mechanism 40, the second pressure relief mechanism 40 is actuated to release the pressure in the accommodating chamber 11a.

[0107] The structural type of the second pressure relief mechanism 40 may be the same as or different from the structural type of the first pressure relief mechanism 34. The second pressure relief mechanism 40 may be in the form of an explosion-proof valve, a balancing valve, a gas valve, a pressure relief valve or a safety valve.

[0108] The "actuation" mentioned in this application means that the first pressure relief mechanism 34 is in action or 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 first pressure relief mechanism 34 may include but is not limited to: the components in the first pressure relief mechanism 34 move to form an exhaust flow channel, at least a part of the first pressure relief mechanism 34 ruptures, breaks, is torn or opened, and so on. When the first pressure relief mechanism 34 is actuated, the high-temperature and high-pressure substances inside the battery cell 30 will be discharged from the actuated part as emissions. In this way, the battery cell 30 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0109] The emissions from the battery cells 30 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the isolation membrane, high-temperature and high-pressure gas generated by the reaction, flames, and the like.

[0110] First, as Figure 2 , Figure 3 and Figure 4 As shown, the battery device 10 provided in the embodiment of the present application includes a battery cell 30, a housing 11, a second pressure relief mechanism 40 and at least two filters 50. The battery cell 30 has a first pressure relief mechanism 34. The housing 11 has a receiving chamber 11a. The battery cell 30 is received in the receiving chamber 11a. The housing 11 has an exhaust passage 11b. The exhaust passage 11b is connected to the receiving chamber 11a. The second pressure relief mechanism 40 is provided in the housing 11. The exhaust passage 11b is configured to guide the emissions discharged by the first pressure relief mechanism 34 to the second pressure relief mechanism 40 for discharge. At least two filters 50 are provided in the exhaust passage 11b. At least two filters 50 are arranged at intervals along the extension direction of the exhaust passage 11b. The filters 50 are configured to filter particles in the emissions.

[0111] When the battery cell 30 is in thermal runaway, the first pressure relief mechanism 34 is actuated to release the pressure inside the battery cell 30 . The exhaust discharged from the battery cell 30 is first discharged into the accommodating chamber 11 a of the box body 11 , and then flows from the accommodating chamber 11 a to the exhaust passage 11 b of the box body 11 .

[0112] The exhaust channel 11b is configured to guide the exhaust discharged from the battery cell 30 to the second pressure relief mechanism 40, and the exhaust channel 11b can be located on the path from the first pressure relief mechanism 34 of the battery cell 30 to the second pressure relief mechanism 40 of the box body 11. Optionally, the exhaust channel 11b can be located inside the frame 113 of the box body 11, or the exhaust channel 11b can be located in the accommodating cavity 11a. Of course, a part of the exhaust channel 11b can also be located in the accommodating cavity 11a, and the other part can be located in the frame 113 of the box body 11.

[0113] The accommodating chamber 11a is connected to the exhaust passage 11b, and the pressure in the accommodating chamber 11a acts on the second pressure relief mechanism 40 through the exhaust passage 11b. When the pressure in the accommodating chamber 11a reaches the pressure relief threshold of the second pressure relief mechanism 40, the second pressure relief mechanism 40 is actuated and discharges the exhaust to the outside of the box body 11 to reduce the pressure in the accommodating chamber 11a.

[0114] The battery device 10 includes at least two filters 50 , and the at least two filters 50 are arranged at intervals along the extension direction of the exhaust passage 11 b , so that the exhaust will flow through each filter 50 in sequence when flowing through the exhaust passage 11 b .

[0115] Since the filter element 50 is configured to filter at least some of the particles in the exhaust, when the exhaust flows through each filter element 50, some of the particles in the exhaust will be blocked by the filter element 50 and remain in the exhaust passage 11b.

[0116] It is understandable that the particle sizes of the particles in the emissions filtered by different filters 50 are different. For example, along the extension direction of the exhaust passage 11b, the particle size of the particles filtered by the filter 50 closer to the second pressure relief mechanism 40 is smaller. In this way, after the emissions flow through multiple filters 50 in sequence, the particle size of the particles filtered by the filter 50 becomes smaller and smaller, which is conducive to reducing the risk of the filter 50 being blocked.

[0117] The particles in the exhaust usually contain electrolyte, debris of the electrode assembly 32, etc. These particles usually contain more harmful substances. At least part of the exhaust is retained in the exhaust channel 11b through the filter element 50, which is beneficial to reduce the concentration and harmful substance content of the exhaust discharged to the outside of the battery device 10.

[0118] Optionally, the filter 50 may be a filter mesh 51, filter fabric or filter paper, etc., which can allow gas and liquid to pass through, so that the exhaust can pass through the filter 50 smoothly and be discharged to the outside of the battery device 10, but can block some particles from passing through, and retain the particles in the exhaust in the exhaust channel 11b. The structural type of the filter 50 can be selected according to actual needs.

[0119] Furthermore, since the exhaust is filtered at at least two filters 50 while flowing through the exhaust passage 11b, the amount of particles filtered out at each filter 50 can be smaller. This helps to reduce the amount of particles deposited at one filter 50 and reduce the risk of the exhaust passage 11b being blocked due to excessive accumulation of particles in the filter 50.

[0120] The battery device 10 provided in the embodiment of the present application is provided with at least two filters 50 in the exhaust passage 11b, so that when the battery device 10 is in thermal runaway, the exhaust passes through the filter 50 at least twice during the process of passing through the exhaust passage 11b, so as to filter the particles in the exhaust at least twice. In this way, it is helpful to reduce the risk of excessive deposition of particles in the exhaust at the filter 50, thereby causing the exhaust passage 11b to be blocked, and it is helpful to reduce the content of particles in the exhaust discharged into the environment, thereby helping to reduce the pollution to the environment in the case of thermal runaway of the battery device 10.

[0121] In some embodiments, Figure 5 As shown, at least two of the filter elements 50 include at least two filter screens 51, and at least two of the filter screens 51 are arranged at intervals along the extension direction of the exhaust passage 11b.

[0122] The filter element 50 includes a filter screen 51 , and the filter screen 51 is in a mesh shape. The material of the filter screen 51 can be a metal material such as steel, or the material of the filter screen 51 can be a high-temperature resistant plastic or fabric.

[0123] The filter screen 51 has a simple structure, and the particle size of the particles filtered by the filter screen 51 can be controlled by controlling the mesh number of the filter screen 51, so as to filter the particles in the discharge step by step.

[0124] Therefore, by providing the filter element 50 with a filter screen 51, it is helpful to simplify the structure of the filter element 50, and it is convenient to control the particle size of the particles filtered by the filter element 50, which is helpful to improve the efficiency of the filter element 50 in filtering particles in emissions.

[0125] In some embodiments, Figure 5 and Figure 6 As shown, at least two filters 51 include a first filter 51a and a second filter 51b. Along the extension direction of the exhaust channel 11b, the first filter 51a is arranged on the side of the second filter 51b close to the second pressure relief mechanism 40, and the mesh number of the first filter 51a is greater than the mesh number of the second filter 51b.

[0126] The "mesh number" can be the number of holes in the filter screen 51 per unit area, such as the number of holes in the filter screen 51 within 1 square inch. If the mesh number of the first filter screen 51a is greater than the mesh number of the second filter screen 51b, then the number of holes in the first filter screen 51a per unit area is greater than the number of holes in the second filter screen 51b, and the pore size of the first filter screen 51a is smaller than the pore size of the second filter screen 51b. In this way, the particle size of the particles filtered out by the first filter screen 51a is smaller than the particle size of the particles filtered out by the second filter screen 51b.

[0127] The first filter 51a is arranged on the side of the second filter 51b close to the second pressure relief mechanism 40 along the extension direction of the exhaust channel 11b. Then, after the discharge from the accommodating chamber 11a flows into the exhaust channel 11b, it will first flow through the second filter 51b, and after the second filter 51b filters out the particles with larger particle sizes, it will flow to the first filter 51a, and filter out the particles with smaller particle sizes through the first filter 51a. In this way, step-by-step filtration is beneficial to increase the amount of particles filtered out in the discharge, and is beneficial to reduce the risk of one filter 51 filtering out more particles and causing the particles to accumulate at the filter 51, thereby causing the exhaust channel 11b to be blocked.

[0128] Optionally, the first filter screen 51a and the second filter screen 51b may be arranged adjacent to each other, or other filter screens 51 may be arranged between the first filter screen 51a and the second filter screen 51b.

[0129] It should be noted that the mesh number of the first filter 51a is greater than the mesh number of the second filter 51b. This may be because, in an embodiment in which a plurality of filters 51 are arranged in the exhaust passage 11b along the extension direction of the exhaust passage 11b, the mesh number of any filter 51 is always greater than the mesh number of another filter 51 on the side facing away from the second pressure relief mechanism 40, and the mesh number of any filter 51 is always less than the mesh number of another filter 51 on the side facing the second pressure relief mechanism 40. In other words, in the extension direction of the exhaust passage 11b, the mesh numbers of the plurality of filters 51 decrease in sequence from the side of the exhaust passage 11b close to the second pressure relief mechanism 40 to the side close to the accommodating chamber 11a. In this way, the exhaust in the accommodating chamber 11a flows through the plurality of filters 51 in sequence during the process of being discharged to the outside of the battery device 10 through the exhaust passage 11b, and the particle size of the filtered particles decreases in sequence.

[0130] Therefore, by setting the mesh size of the first filter 51a to be larger than the mesh size of the second filter 51b, larger particles in the emissions are filtered out first when the emissions flow through the exhaust channel 11b. This is beneficial for improving the filtering efficiency of the filter 51 for particles in the emissions, while also helping to reduce the risk of excessive accumulation of particles in the filter 51, causing the exhaust channel 11b to be blocked.

[0131] In some embodiments, at least two filter elements 50 include at least three filter screens 51, and the at least three filter screens 51 are arranged at intervals along the extension direction of the exhaust channel 11b. Along the extension direction of the exhaust channel 11b, from the side of the exhaust channel 11b close to the accommodating chamber 11a to the side close to the second pressure relief mechanism 40, the mesh size of the filter screens 51 increases successively.

[0132] Optionally, three, four or more filters 51 may be arranged at intervals along the extension direction of the exhaust passage 11b, and may be selected according to actual needs.

[0133] Along the extension direction of the exhaust passage 11b, from the side of the exhaust passage 11b close to the accommodating chamber 11a to the side close to the second pressure relief mechanism 40, the mesh number of the filter 51 increases successively, and the emissions in the accommodating chamber 11a, after flowing into the exhaust passage 11b, the mesh number of the filter 51 passes through increases successively, so that the particle size of the particles filtered out by the multiple filter screens 51 in the emissions decreases successively. In other words, in the process of the emissions flowing through the multiple filter screens 51, the larger particles in the emissions are filtered out first, so that each time the emissions pass through a filter screen 51, a corresponding amount of particles are filtered out, which is beneficial to increase the total amount of particles filtered out of the emissions, and also helps to reduce the risk of particles accumulating at the filter screen 51.

[0134] Therefore, at least three levels of filters 51 are provided and arranged along the extension direction of the exhaust channel 11b, from the side of the exhaust channel 11b close to the accommodating chamber 11a to the side close to the second pressure relief mechanism 40, and the mesh size of the filters 51 increases successively, which is beneficial to increase the total amount of particles filtered out of the emissions, so as to improve the filtering efficiency of the filters 51 on the emissions, and is also beneficial to reduce the risk of the exhaust channel 11b being blocked due to the accumulation of particles at the filters 51, and is beneficial to improve the smoothness of the exhaust discharge in the event of thermal runaway of the battery device 10.

[0135] In some embodiments, along the extension direction of the exhaust passage 11 b , of any two adjacent filter screens 51 , one close to the second pressure relief mechanism 40 has a mesh size of A1, and the other has a mesh size of A2, and 2≤A1 / A2≤30.

[0136] Optionally, A1 / A2 can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30, etc.

[0137] It can be understood that multiple filters 51 can be arranged at intervals in the exhaust passage 11b. The larger the value of the ratio A1 / A2 of the mesh numbers of any two adjacent filters 51, the greater the difference in particle size of particles in the emissions filtered out by the two adjacent filters 51, the greater the difference in the amount of particles filtered out by the two adjacent filters 51, and the higher the risk that one of the two adjacent filters 51 close to the second pressure relief mechanism 40 is blocked by particulate matter.

[0138] The smaller the value of the ratio A1 / A2 of the mesh numbers of any two adjacent filter screens 51 is, the smaller the difference in particle size of the particles in the emissions filtered out by the two adjacent filter screens 51 is. Therefore, fewer particles are filtered out on the side of the second pressure relief mechanism 40 between the two adjacent filter screens 51, and the filtering effect is relatively small.

[0139] To this end, the inventor conducted a series of tests on a plurality of different battery devices 10. For different battery devices 10, only the mesh size of any two adjacent screens was changed, and other parameters were the same. By triggering thermal runaway on 100 battery devices 10 respectively, recording the proportion of blockage of the exhaust channel 11b in the 100 battery devices 10 and the weight of the particulate matter deposited on the screen, the test results are shown in Table 1 below, where the weight of the particulate matter deposited on the screen is the total weight of the particles deposited on the screens corresponding to the mesh sizes A1 and A2.

[0140] Table 1 Effect of different A1 / A2 on the smoothness of the exhaust passage 11b and the amount of filtered particles

[0141]

[0142] As can be seen from Table 1 above, in the comparative example where A1 / A2 is less than 2, the exhaust passage 11b is not blocked, but the weight of the particles filtered out of the filter 51 is small. In the comparative example where A1 / A2 is greater than 30, the weight of the particles deposited on the filter 51 is large, but the proportion of the filter 51 being blocked is large.

[0143] Therefore, the inventors have found through systematic analysis and long-term practice that setting 2≤A1 / A2≤30 is beneficial to reducing the risk of the exhaust passage 11b being blocked while also helping to increase the weight of particles filtered by the filter 51.

[0144] In some embodiments, 2≤A1 / A2≤20.

[0145] As shown in Table 1 above, when A1 / A2≤20, the battery device 10 will not be blocked, and when A1 / A2≥2, the weight of the particles filtered out by the filter 51 can be effectively increased. Therefore, setting 2≤A1 / A2≤20 is beneficial for further reducing the risk of the exhaust passage 11b being blocked, while also helping to further increase the weight of the particles filtered out by the filter 51.

[0146] In some embodiments, Figure 6 As shown, the distance d between any two adjacent filter screens 51 along the extension direction of the exhaust passage 11b satisfies: d≥0.5m.

[0147] Optionally, d may be 0.5 m, 0.6 m, 0.7 m, 0.8 m, 0.9 m, 1 m, 1.5 m or 2 m, etc.

[0148] It is understandable that the larger the distance d between two adjacent filters 51 along the extension direction of the exhaust channel 11b to a certain extent, the more conducive it is to improving the smoothness of exhaust in the exhaust channel 11b. If d is too small, it may cause a certain risk of blockage. Therefore, d has a minimum value.

[0149] To this end, the inventors conducted experiments on a series of battery devices 10. For different battery devices 10, only the spacing between two adjacent filters 51 was changed, and other parameters remained unchanged. Thermal runaway was triggered 100 times for each battery device 10 to obtain the percentage of blockage in the exhaust passage 11b. The experimental results are shown in Table 2.

[0150] Table 2 Effect of the distance d between two adjacent filter screens 51 on the smoothness of the exhaust passage 11b

[0151]

[0152] It can be seen from the above table that in the comparative example where d is less than 0.5 m, the proportion of blockage in the exhaust passage 11 b is relatively high, and in the embodiment where d reaches 0.5 m, the proportion of blockage in the exhaust passage 11 b is greatly reduced.

[0153] Therefore, after systematic analysis and long-term practice, the inventors found that setting d≥0.5m is beneficial to improving the smoothness of exhaust in the exhaust passage 11b and reducing the risk of the exhaust passage 11b being blocked.

[0154] In some embodiments, Figure 6 As shown, d≥1m.

[0155] It can be seen from Table 2 that in the embodiment where d is 1 m or more, the exhaust passage 11 b is no longer blocked. Therefore, by setting d ≥ 1 m, it is beneficial to further improve the smoothness of exhaust of the exhaust passage 11 b and further reduce the risk of the exhaust passage 11 b being blocked.

[0156] In some embodiments, the filter 51 is connected to the inner wall of the exhaust passage 11b by welding, bonding or snapping.

[0157] The filter screen 51 is connected to the inner wall of the exhaust passage 11 b , and the circumference of the filter screen 51 may be connected to the inner wall of the exhaust passage 11 b .

[0158] Since welding connection, adhesive connection and snap connection are simple, quick and have high connection reliability, therefore, by setting the filter 51 and the inner wall of the exhaust channel 11b for welding connection, adhesive connection or snap connection, it is convenient to connect the filter 51 with the inner wall of the exhaust channel 11b, and it is beneficial to improve the reliability of the connection between the filter 51 and the inner wall of the exhaust channel 11b.

[0159] In some embodiments, the battery cell 30 is a ternary battery cell.

[0160] The ternary battery cell has a high energy density, and the chemical reaction it produces in the case of thermal runaway is more violent, and the content of particles in the discharged emissions is relatively high. By arranging at least two filters 50 in the exhaust channel 11b, it is beneficial to give full play to the filtering effect of the filter 50, reduce the risk of excessive deposition of particles in the emissions at the filter 50 and cause the exhaust channel 11b to be blocked, and help reduce the content of particles in the emissions discharged into the environment, thereby helping to reduce the pollution to the environment in the case of thermal runaway of the battery device 10.

[0161] In some embodiments, Figure 7 and 8 As shown, the box body 11 includes a frame 113 , the frame 113 surrounds a receiving cavity 11 a , and at least a portion of the exhaust passage 11 b is disposed in the frame 113 .

[0162] The frame 113 can play a certain supporting role, so that the box body 11 has a certain structural strength to support the battery cells 30 in the box body 11 .

[0163] At least part of the exhaust passage 11 b is disposed in the frame 113 . The frame 113 can be used to set the exhaust passage 11 b , which is beneficial to simplify the structure of the box 11 without affecting the structural strength of the box 11 , thereby reducing the production cost of the battery device 10 .

[0164] In some embodiments, Figure 7 and Figure 8 As shown, the exhaust channel 11b includes a plurality of flow channels 111b, the frame 113 forms a hollow cavity 113a, the box body 11 also includes a partition 114, the partition 114 is arranged in the hollow cavity 113a, the partition 114 divides the hollow cavity 113a into a plurality of flow channels 111b, the plurality of flow channels 111b are connected end to end in sequence, and at least one filter element 50 is arranged in any flow channel 111b.

[0165] The frame 113 may have an air inlet 113b and an air outlet 113c, wherein the air inlet 113b is disposed toward the accommodating chamber 11a and communicates with the accommodating chamber 11a. The second pressure relief mechanism 40 is disposed on the frame 113 and communicates with the air outlet 113c. The exhaust channel 11b communicates with the air inlet 113b and the air outlet 113c, and the exhaust flows from the air inlet 113b through the plurality of flow channels 111b in sequence, flows to the air outlet 113c, and flows out through the air outlet 113c.

[0166] The partition 114 divides the hollow cavity 113a in the frame 113 into a plurality of flow channels 111b. The plurality of flow channels 111b are connected end to end in sequence, and the plurality of flow channels 111b may be in an "S" shape or a "bow" shape.

[0167] It can be understood that dividing the space within the frame 113 into a plurality of flow channels 111b by the partition 114 is conducive to increasing the overall length of the exhaust channel 11b. In the event of thermal runaway of the battery device 10, the exhaust flow through the exhaust channel 11b is longer, so that the exhaust can be more fully processed, the content of harmful substances in the exhaust discharged to the outside of the battery device 10 can be reduced, and the pollution of the exhaust to the environment can be reduced.

[0168] By providing at least one filter 50 in any flow channel 111b, the exhaust can be filtered multiple times through the filter 50, thereby increasing the total amount of particles remaining in the exhaust channel 11b and reducing the content of particles in the exhaust discharged to the outside of the battery device 10. Moreover, since the exhaust is filtered at multiple filters 50, the amount of particles remaining in each flow channel 111b can be less, which is conducive to further reducing the risk of the exhaust channel 11b being blocked.

[0169] Therefore, by setting a plurality of flow channels 111b in the hollow cavity 113a of the frame 113, and setting a plurality of flow channels 111b to be connected end to end in sequence, and setting at least one filter element 50 in any flow channel 111b, it is beneficial to further improve the treatment efficiency of emissions, increase the content of particulate matter deposited and retained in the exhaust channel 11b, further reduce the pollution of the environment by emissions, and help reduce the risk of the exhaust channel 11b being blocked.

[0170] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0171] The electric device provided in the embodiment of the present application has the same technical effect as the battery device 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0172] In some embodiments, Figures 2 to 8As shown, the battery device 10 includes a battery cell 30, a housing 11, a second pressure relief mechanism 40 and at least two filters 51. The battery cell 30 has a first pressure relief mechanism 34, the housing 11 has a receiving chamber 11a, the battery cell 30 is received in the receiving chamber 11a, the housing 11 has an exhaust passage 11b, and the exhaust passage 11b is connected to the receiving chamber 11a. The second pressure relief mechanism 40 is provided in the housing 11, and the exhaust passage 11b is configured to guide the exhaust discharged by the first pressure relief mechanism 34 to the second pressure relief mechanism 40 to be discharged outside the housing 11. At least two filters 51 are provided in the exhaust passage 11b, and at least two filter elements 50 are arranged at intervals along the extension direction of the exhaust passage 11b, and the filter 51 is configured to filter particles in the exhaust. At least two filters 51 include a first filter 51a and a second filter 51b. Along the extension direction of the exhaust passage 11b, the first filter 51a is arranged on the side of the second filter 51b close to the second pressure relief mechanism 40, and the mesh number of the first filter 51a is greater than the mesh number of the second filter 51b. Along the extension direction of the exhaust passage 11b, the mesh number of one of any two adjacent filter screens 51 close to the second pressure relief mechanism 40 is A1, and the mesh number of the other is A2, 2≤A1 / A2≤30. The spacing d between any two adjacent filter screens 51 along the extension direction of the exhaust passage 11b satisfies: d≥0.5m. The filter 51 is welded, bonded or snapped to the inner wall of the exhaust passage 11b. The box body 11 includes a frame 113, and the frame 113 is arranged to form a receiving cavity 11a, and at least part of the exhaust passage 11b is arranged in the frame 113. The exhaust channel 11b includes multiple flow channels 111b, the frame 113 forms a hollow cavity 113a, and the box body 11 also includes a partition 114, which is arranged in the hollow cavity 113a. The partition 114 divides the hollow cavity 113a into multiple flow channels 111b, and the multiple flow channels 111b are connected end to end in sequence. At least one filter element 50 is arranged in any flow channel 111b.

[0173] The battery device 10 provided in the embodiment of the present application is provided with at least two filters 50 in the exhaust passage 11b, so that when the battery device 10 is in thermal runaway, the exhaust passes through the filter 50 at least twice during the process of passing through the exhaust passage 11b, so as to filter the particles in the exhaust at least twice. In this way, it is helpful to reduce the risk of excessive deposition of particles in the exhaust at the filter 50, thereby causing the exhaust passage 11b to be blocked, and it is helpful to reduce the content of particles in the exhaust discharged into the environment, thereby helping to reduce the pollution to the environment in the case of thermal runaway of the battery device 10.

[0174] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery cell having a first pressure relief mechanism; A box body having a containing cavity, wherein the battery monomer is contained in the containing cavity, and the box body having an exhaust passage, wherein the exhaust passage is communicated with the containing cavity; A second pressure relief mechanism is provided in the housing, and the exhaust passage is configured to guide the exhaust discharged by the first pressure relief mechanism to the second pressure relief mechanism to be discharged from the housing; At least two filters are disposed in the exhaust passage. Along the extension direction of the exhaust passage, at least two filters are spaced apart. The filters are configured to filter particles in the exhaust.

2. The battery device according to claim 1, characterized in that: At least two of the filter elements include at least two filter screens, and the at least two filter screens are arranged at intervals along the extension direction of the exhaust passage.

3. The battery device according to claim 2, characterized in that: At least two of the filters include a first filter and a second filter. Along the extension direction of the exhaust passage, the first filter is arranged on a side of the second filter close to the second pressure relief mechanism, and the mesh number of the first filter is greater than the mesh number of the second filter.

4. The battery device according to claim 2, characterized in that: At least two of the filter elements include at least three filter screens, and at least three filter screens are arranged at intervals along the extension direction of the exhaust channel. Along the extension direction of the exhaust channel, the mesh size of the filter screens increases successively from the side of the exhaust channel close to the accommodating chamber to the side close to the second pressure relief mechanism.

5. The battery device according to claim 2, characterized in that: Along the extension direction of the exhaust passage, of any two adjacent filter screens, one close to the second pressure relief mechanism has a mesh size of A1, and the other has a mesh size of A2, and 2≤A1 / A2≤30.

6. The battery device according to claim 5, characterized in that: 2≤A1 / A2≤20.

7. The battery device according to claim 2, characterized in that: The distance d between any two adjacent filter screens along the extension direction of the exhaust passage satisfies: d≥0.5m.

8. The battery device according to claim 7, characterized in that: d≥1m.

9. The battery device according to any one of claims 2 to 8, characterized in that: The filter screen is connected to the inner wall of the exhaust passage by welding, bonding or clamping.

10. The battery device according to any one of claims 1 to 8, characterized in that: The battery cell is a ternary battery cell.

11. The battery device according to any one of claims 1 to 8, characterized in that: The box body comprises a frame, the frame is arranged to surround the accommodating cavity, and at least a part of the exhaust passage is arranged in the frame.

12. The battery device according to claim 11, characterized in that: The exhaust channel includes a plurality of flow channels, the frame forms a hollow cavity, the box body also includes a partition, the partition is arranged in the hollow cavity, the partition divides the hollow cavity into a plurality of the flow channels, the plurality of the flow channels are connected end to end in sequence, and at least one filter element is arranged in any of the flow channels.

13. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 12, wherein the battery device is used to provide electrical energy.

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