Battery device and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device and a power utilization device, the battery device comprises a plurality of battery monomers and first filtering pieces, the plurality of battery monomers are arranged in sequence, and the first filtering pieces are located on the peripheral sides of the surfaces, provided with pressure relief mechanisms, of the battery monomers and located between the adjacent battery monomers. According to the battery device disclosed by the embodiment of the invention, by arranging the first filtering piece, high-temperature particulate matters can be screened out when the battery monomers are in thermal runaway, so that the spreading speed of the thermal runaway is reduced, and the safety, the reliability and the robustness of the battery device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery device and an electric device. Background Art

[0002] In the related art, when a battery cell in a battery device experiences thermal runaway, the pressure relief mechanism will release pressure in a timely manner, and the high-temperature particulate matter inside the battery cell will be ejected outward under the influence of the high-temperature airflow ejected by the pressure relief mechanism, and then spread to the surrounding battery cells that have not experienced thermal runaway, thereby accelerating the spread of thermal runaway. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery device, wherein the thermal runaway of the battery device has a slower propagation speed and higher safety.

[0004] The present application further proposes an electrical device using the above battery device.

[0005] In a first aspect, the present application proposes a battery device, comprising: a battery cell and a first filter element, wherein the battery cells are multiple and arranged in sequence, and the first filter element is located on the peripheral side of the surface of the battery cell having a pressure relief mechanism and is located between adjacent battery cells.

[0006] According to the battery device of the embodiment of the present application, by providing a first filter element, high-temperature particulate matter can be screened out when thermal runaway occurs in the battery cell, thereby reducing the propagation speed of the thermal runaway and improving the safety, reliability and robustness of the battery assembly system.

[0007] According to some embodiments of the present application, the battery cells are arranged in rows along a first direction and in columns along a second direction, the first direction is perpendicular to the second direction, there are multiple first filters, and they are arranged on both sides of each battery cell along the first direction and / or on both sides of each battery cell along the second direction.

[0008] In the above technical solution, high-temperature filter material blocking can be achieved between adjacent battery cells at least in the first direction or the second direction, so as to achieve the technical effect of reducing the spread speed of thermal runaway, improve the safety and reliability of the battery device, and reduce the difficulty of laying out the first filter element.

[0009] According to some embodiments of the present application, a avoiding portion is provided on the first filter element, and the avoiding portion is used to avoid a boundary component electrically connected to the battery cell.

[0010] In the above technical solution, the avoidance portion can avoid the boundary component, so that it is easier to arrange the boundary component on the battery cell, reduce the probability of interference between the first filter element and the boundary component, reduce the difficulty of assembling the battery device, improve the assembly efficiency, and enable it to meet various structural design requirements, such as different electrical connection schemes for multiple battery cells.

[0011] According to some embodiments of the present application, a dimension of the battery cell in the first direction is L1, and the pressure relief mechanism and the electrode terminals are sequentially arranged along the first direction, a length dimension of the pressure relief mechanism in the first direction is L2, a distance between two electrode terminals is L3, a dimension of the avoidance portion is L4, and (L1-L3) / 2≤L4≤(L1-L2) / 2 is satisfied.

[0012] In the above technical solution, there are two avoidance parts, each corresponding to an electrode terminal, so as to avoid the boundary component connected to the electrode terminal, and the size of the avoidance part is larger than the above size range, so that the size of the part of the first filter element located between adjacent electrode terminals can be more reasonable. The size of this part is larger than the size of the pressure relief mechanism and smaller than the distance between adjacent electrode terminals, so as to improve the barrier effect of the first filter element on high-temperature particulate matter between adjacent battery cells, thereby improving safety and reliability.

[0013] According to some embodiments of the present application, each first filter element includes a plurality of sub-filter elements, and the plurality of sub-filter elements are arranged at intervals in the first direction and correspond one-to-one to the battery cells.

[0014] In the above technical solution, while meeting the corresponding protection effect, the material cost of the first filter element can also be reduced.

[0015] According to some embodiments of the present application, the size of the sub-filter element is L5, and satisfies L2≤L5≤L3.

[0016] In the above technical solution, the size of the sub-filter element is within the above-mentioned proportional range, so that the size of the sub-filter element can be larger than the size of the pressure relief mechanism and smaller than the distance between two adjacent electrode terminals, so as to improve the barrier and protection effect of the sub-filter element. At the same time, in the first direction, the area between adjacent sub-filter elements can be formed into an avoidance gap, which can also achieve the same technical effect as the above-mentioned avoidance portion.

[0017] According to some embodiments of the present application, the battery device further includes: a box body, the box body defines a containing space, the battery cell is arranged in the containing space, and the first filter is arranged between the box body and the battery cell.

[0018] In the above technical solution, the first filter element is arranged in the accommodating space and is located between the box body and the battery cell, such as between the top inner wall of the box body and the battery cell, between the side inner wall and the battery cell, and between the bottom inner wall and the battery cell, that is, it is arranged in the gap between the battery cell and the box body. In this gap, high-temperature particulate matter is screened and blocked, thereby effectively reducing the heat propagation rate between adjacent battery cells and improving safety and reliability.

[0019] According to some embodiments of the present application, the box body has a tray and a cover plate, and the first filter element is integrated with the cover plate, or the first filter element is connected to the battery cell.

[0020] In the above technical solution, in the embodiment where the first filter element is connected to the battery cell, the difficulty of arranging the boundary components during the assembly process can be reduced and the assembly efficiency can be improved. In the embodiment where the first filter element is integrated with the cover plate, the difficulty of grouping the battery device is lowered, the assembly tolerance can be reduced and the assembly accuracy can be improved.

[0021] According to some embodiments of the present application, a battery cell includes: a shell and an end cover, the end cover is connected to the shell, the end cover is integrated with an electrode terminal and a pressure relief mechanism, and the first filter is arranged on the peripheral side of the end cover.

[0022] According to some embodiments of the present application, a second filter element is further provided on the end cover. The second filter element is located on a side of the end cover facing the shell or a side away from the shell and directly opposite to the pressure relief mechanism.

[0023] In the above technical solution, a second filter element is further arranged on the inner side or the outer side of the pressure relief mechanism, and the second filter element can be used to block and screen out high-temperature particulate matter, and the first filter element and the second filter element can cooperate to achieve double screening and blocking effects, which can further improve the safety and reliability of the battery device.

[0024] According to some embodiments of the present application, the area of ​​the second filter element is S1, the flow area when the pressure relief mechanism is opened is S2, and S1≥S2 is satisfied.

[0025] In the above technical scheme, under the premise that the second filter element has a stable and reliable screening and blocking effect, the flow area of ​​the pressure relief mechanism can also be kept stable, preventing the effective flow area of ​​the pressure relief mechanism from being reduced due to the small area of ​​the second filter element, so that the pressure relief effect of the pressure relief mechanism can be kept stable and reliable.

[0026] According to some embodiments of the present application, the connection strength between the shell and the end cover is Q1, the structural strength of the second filter element is Q2, the connection strength between the second filter element and the end cover is Q3, and Q3>Q1>Q2 is satisfied.

[0027] In the above technical solution, when the battery cell is subjected to greater pressure, the shell and the end cover will not be disengaged when the pressure relief mechanism is opened under pressure, and the second filter chamber and the end cover will not be disengaged when the pressure relief mechanism is opened, so as to ensure the fixing stability and reliability of the second filter element, reduce the probability of the second filter element falling off, and make the filtering function of the second filter element stable and reliable.

[0028] According to some embodiments of the present application, the first filter element and the second filter element are both configured as filter screens, and the pore size R of the filter screens satisfies: 0.02 mm ≤ R < 5 mm.

[0029] In the above technical solution, the present application can improve the filtering effect and effectively screen out high-temperature particulate matter by setting a first filter element and a second filter element with a more reasonable pore size, so as to improve the safety and reliability of the battery device.

[0030] In a second aspect, the present application proposes an electrical device, including: the battery device in the above embodiment.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the cooperation between the battery cell and the first filter element according to the first embodiment of the present application;

[0035] Figure 3 yes Figure 2 A schematic side view of the structure;

[0036] Figure 4 is a schematic diagram of the cooperation between a battery cell and a first filter according to the second embodiment of the present application;

[0037] Figure 5 is a schematic diagram of a first filter element according to an embodiment of the present application;

[0038] Figure 6 is a schematic diagram of a sub-filter according to an embodiment of the present application;

[0039] Figure 7 is a schematic diagram of the cooperation between the avoidance portion of the first filter element and the battery cell according to an embodiment of the present application;

[0040] Figure 8 is a schematic diagram of the cooperation between the sub-filter and the battery cell according to an embodiment of the present application;

[0041] Fig. 9 is a schematic diagram of a battery device according to an embodiment of the present application;

[0042] Fig.10 is a schematic diagram of a disassembled battery device according to an embodiment of the present application;

[0043] Fig.11 is a schematic diagram of a first end cap according to an embodiment of the present application;

[0044] Fig.12 is a schematic diagram of the disassembly of the first end cover according to an embodiment of the present application;

[0045] Fig.13 is a schematic diagram of an angle of a second end cap according to an embodiment of the present application;

[0046] Fig.14 is a schematic diagram of another angle of the second end cap according to an embodiment of the present application;

[0047] Fig.15 is a schematic diagram of a third end cap according to an embodiment of the present application;

[0048] Fig.16 is a schematic diagram of a first second filter element according to an embodiment of the present application;

[0049] Fig.17 It is a schematic diagram of a second type of second filter element according to an embodiment of the present application.

[0050] Reference numerals:

[0051] The battery device 100,

[0052] Battery cell 10, housing 11, end cover 12, electrode terminal 13, pressure relief mechanism 14, second filter element 15,

[0053] The first filter element 20, the avoidance portion 21, the sub-filter element 22,

[0054] Tray 31, cover 32,

[0055] Electric device 200, controller 300, motor 400,

[0056] The first direction is X, and the second direction is Y. DETAILED DESCRIPTION

[0057] 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 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.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings 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.

[0059] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0060] 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.

[0061] 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.

[0062] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0065] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0066] The term “plurality” used in this application refers to two or more (including two).

[0067] At present, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as assembly, aerospace and other fields. As the application fields of batteries continue to expand, their market demand is also constantly expanding.

[0068] The battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0069] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0070] The battery apparatus 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 multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0071] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0077] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, and may also include a top cover and a tray, so that a closed space is formed inside the box body to accommodate the battery monomer assembly.

[0078] 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.

[0079] The embodiment of the present application provides an energy storage device, including one or more battery clusters (Battery Cluster) to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0080] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0081] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0082] 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, and the like. The vehicle 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0083] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0084] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application. A battery device 100 is provided inside the vehicle, and the battery device 100 can be provided at the bottom, head, or tail of the vehicle. The battery device 100 can be used to power the vehicle, for example, the battery device 100 can be used as an operating power source for the vehicle.

[0085] The vehicle may further include a controller 300 and a motor 400 . The controller 300 is used to control the battery device 100 to supply power to the motor 400 . The motor 400 serves as a load, for example, to meet the power requirements of starting, navigating and driving the vehicle.

[0086] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0087] Please refer to Fig. 9 and Fig.10 As shown, Fig. 9 and Fig.10A schematic diagram of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a battery cell and a box, and the box is used to accommodate the battery cell (such as a battery module).

[0088] Among them, the box body is a component for accommodating the battery unit, and the box body provides a placement space for multiple battery cells 10 in the battery unit. The box body can adopt a variety of structures. In some embodiments, the box body may include a tray 31 and a cover plate 32, and the tray 31 and the cover plate 32 cover each other to define a placement space for accommodating the battery cell 10. The tray 31 and the cover plate 32 can be in various shapes, such as a cuboid, a cylinder, etc. The tray 31 can be a hollow structure with one side open, and the cover plate 32 can also be a hollow structure with one side open, and the open side of the cover plate 32 covers the open side of the tray 31, so as to form a box body with a placement space. It can also be that the tray 31 is a hollow structure with one side open, the cover plate 32 is a plate-like structure, and the cover plate 32 covers the open side of the tray 31, so as to form a box body with a placement space. As an example, the battery cell 10 can be a cylindrical battery cell 10, a prismatic battery cell 10, or a battery cell 10 of other shapes, and there is no special limitation in this application.

[0089] In the battery device 100, there can be one or more battery cells 10. If there are more than one battery cell 10, the battery cells 10 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 10 are both connected in series and in parallel. A battery unit can be formed by connecting a plurality of battery cells 10 in series, in parallel, or in a mixed connection, and then the battery units are connected in series, in parallel, or in a mixed connection to form a whole and accommodated in a box. Alternatively, all battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all battery cells 10 is accommodated in a box.

[0090] The battery cell 10 is the smallest energy unit of the battery unit or the battery device 100 . The battery unit or the battery device 100 includes a plurality of battery cells 10 . The battery cell 10 includes a housing 11 , an end cover 12 , and an electrode assembly disposed in the housing 11 .

[0091] The battery cell 10 includes: a shell 11, an end cover 12 and an electrode assembly. The shell 11 may include a bottom plate and a side plate. The side plate is arranged around the bottom plate and defines an installation space with an installation opening. The electrode assembly and other functional components can be arranged in the installation space. The end cover 12 covers the installation opening of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. The shape of the end cover 12 is compatible with the shape of the shell 11. The end cover 12 can be supported by a material with a certain hardness and strength (such as aluminum alloy, carbon fiber plate), and the end cover 12 can effectively protect the safety and reliability of the internal components of the shell 11 during extrusion and collision.

[0092] In some embodiments, the end cap 12 may also be provided with a pressure relief mechanism 14 (such as a pressure relief valve) for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The material of the end cap 12 may also be various, 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 member may also be provided on the inner side of the end cap 12, and the insulating member may be used to isolate the electrical connection components in the housing 11 from the end cap 12 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0093] The shell 11 is a component used to cooperate with the end cap 12 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell 11 and the end cap 12 can be independent components, and a mounting port can be set on the shell 11, and the internal environment of the battery cell 10 is formed by covering the opening of the end cap 12 at the mounting port. The shell 11 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 11 can be determined according to the specific shape and size of the electrode assembly. The material of the shell 11 can be various, 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.

[0094] The electrode assembly is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies may be included in the housing 11. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery device 100, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 13 to form a current loop.

[0095] In the prior art, when thermal runaway occurs in the battery device 100, the pressure relief mechanism 14 of one or more battery cells 10 starts to relieve pressure and generates a high-pressure and high-temperature airflow. The high-pressure and high-temperature airflow will entrain the high-temperature particles inside the battery cell 10 and spray them out. The high-temperature particles may act on the adjacent battery cells 10 that have not experienced thermal runaway, and cause the battery cells 10 that have not experienced thermal runaway to experience thermal runaway, thereby aggravating the spread of thermal runaway and posing a safety hazard.

[0096] In view of this, an embodiment of the present application provides a battery device 100, which can reduce the thermal runaway propagation speed between adjacent battery cells 10 by providing a first filter 20, so as to reduce safety hazards and improve safety.

[0097] Reference below Figure 1-Figure 17 A battery device 100 and an electric device 200 according to an embodiment of the present invention are described.

[0098] like Figure 2 , Figure 3 and Figure 4 As shown, the present application proposes a battery device 100 , including: a battery cell 10 and a first filter 20 .

[0099] There are multiple battery cells 10 , and the multiple battery cells 10 are arranged in sequence. The first filter 20 is located on the peripheral side of the surface of the battery cell 10 having the pressure relief mechanism 14 , and is located between adjacent battery cells 10 .

[0100] Specifically, the battery cells 10 can be arranged in a row, such as arranging a plurality of cells in sequence in a first direction, or in an array, such as arranging a plurality of cells in sequence in both the first direction and the second direction, with the first direction being perpendicular to the second direction. A pressure relief mechanism 14 can be provided on at least one side surface of the battery cell 10. The pressure relief mechanism 14 is suitable for opening when the internal pressure of the battery cell 10 exceeds a pressure threshold, and for timely pressure relief to prevent the internal pressure of the battery cell 10 from being too high, thereby causing more serious damage to the battery device 100.

[0101] However, when the pressure relief mechanism 14 releases pressure, it means that the battery cell 10 has thermal runaway. While discharging the high-temperature and high-pressure airflow, the high-temperature particles inside the battery cell 10 will also be ejected. That is, when the battery cell 10 has thermal runaway, a large amount of high-temperature particles will be ejected from the pressure relief mechanism 14. The high-temperature particles will cause damage to the battery system interface, such as generating local hot spots, insulation failure, impact damage and other thermal, electrical and mechanical damage, and aggravate the spread of thermal runaway, reducing the escape time of nearby personnel when the battery device 100 has thermal runaway, and posing a great safety hazard.

[0102] Based on this, the present application further provides a first filter element 20, and the first filter element 20 and the pressure relief mechanism 14 are arranged on the same side surface of the battery cell 10, and the first filter element 20 can be arranged around the circumference of the surface. If the pressure relief mechanism 14 is arranged on the cell end face of the battery cell 10, the first filter element 20 can be arranged on the circumference of the cell end face, so that the adjacent battery cells 10 can be separated in at least one direction by the first filter element 20 to achieve the isolation of high-temperature particulate matter between adjacent battery cells 10, that is, the high-temperature particulate matter splashed during thermal runaway can be effectively screened out, and the propagation of particulate matter can be prevented from the path to reduce safety hazards.

[0103] Exemplarily, the battery cell 10 includes a large cell surface, a cell end surface and a cell side surface. Taking the pressure relief mechanism 14 provided on the cell end surface as an example, the first filter element 20 can be arranged around the side of the cell end surface. For example, there are four first filter elements 20, two of which are arranged opposite to each other in the direction of the two cell side surfaces to block the transfer of high-temperature particles between adjacent battery cells 10 in the direction of the cell side surfaces, and the other two are arranged opposite to each other in the direction of the two cell side surfaces to block the transfer of high-temperature particles between opposite battery cells 10 in the direction of the large cell surfaces.

[0104] Of course, there may be two first filter elements 20, such as being arranged in the direction of two monomer side surfaces, or being arranged in the direction of two monomer end surfaces, which is not specifically limited in the present application.

[0105] According to the battery device 100 of the embodiment of the present application, by providing the first filter element 20, when the battery cell 10 has thermal runaway, high-temperature particles can be screened out to reduce the spread of thermal runaway and improve the safety, reliability and robustness of the battery device. Figure 2 and Figure 4 As shown, according to some embodiments of the present application, the battery cells 10 are arranged in rows along a first direction and in columns along a second direction, the first direction is perpendicular to the second direction, there are multiple first filters 20, and they are arranged on both sides of each battery cell 10 along the first direction and / or on both sides of each battery cell 10 along the second direction.

[0106] For example, in Figure 2 In the illustrated embodiment, the battery cells 10 are arranged in rows along the first direction and in columns along the second direction, and a plurality of first filters 20 are arranged on both sides of each battery cell 10 in the second direction. Figure 4 In the illustrated embodiment, the battery cells 10 are arranged in rows along the first direction and in columns along the second direction, and a plurality of first filters 20 are disposed on both sides of each battery cell 10 in the first direction.

[0107] Of course, the first filter 20 may also be arranged on both sides of each battery cell 10 in the first direction and the second direction.

[0108] Thus, high-temperature filter material can be blocked between adjacent battery cells 10 at least in the first direction or the second direction, so as to achieve the technical effect of reducing the propagation speed of thermal runaway, improve the safety and reliability of the battery device 100, and reduce the difficulty of laying out the first filter element 20.

[0109] It can be understood that the first filter element 20 is suitable for being relatively arranged on the side of the single body, or relatively arranged on the large surface of the single body, so that the first filter element 20 structure can be applicable to the battery single body 10 where the electrode assembly and the electrode terminal 13 are located on the same side, and can also be applicable to the battery single body 10 where the electrode assembly and the electrode terminal 13 are located on different sides.

[0110] It should be pointed out that if Figure 5 As shown, the first filter 20 can be an integrated long plate structure, such as four battery cells 10 are arranged in sequence in the first direction, and the length of the first filter 20 is close to the sum of the lengths of the four battery cells 10 in the first direction, and is arranged on both sides of the four battery cells 10 in the second direction, such as Figure 6 As shown, the first filter 20 may also include a plurality of sub-filters 22, the length of the sub-filters 22 being consistent with the length of the battery cell 10 in the first direction or the length in the second direction, and being arranged in the second direction or the first direction accordingly.

[0111] In this way, a flexible selection can be made according to the design requirements of the battery device 100, and the arrangement and assembly difficulty of the first filter element 20 can be reduced, thereby improving the assembly efficiency.

[0112] See also Figure 7 As shown, according to some embodiments of the present application, a avoiding portion 21 is provided on the first filter element 20 , and the avoiding portion 21 is used to avoid a boundary component electrically connected to the battery cell 10 .

[0113] It should be pointed out that the boundary components can be components such as bars for electrically connecting adjacent battery cells 10, collection harnesses for collecting working signals (such as temperature signals, voltage signals, current signals), and the avoidance portion 21 can avoid the boundary components to make it easier to arrange the boundary components on the battery cells 10, reduce the probability of interference between the first filter element 20 and the boundary components, reduce the difficulty of assembling the battery device 100, improve assembly efficiency, and enable it to meet various structural design requirements, such as different electrical connection schemes for multiple battery cells 10.

[0114] It should be noted that the avoidance portion 21 can be configured as a circular, square or irregular-shaped through hole on the first filter element 20 .

[0115] Combination Figure 7 and Fig.11 As shown, according to some embodiments of the present application, the dimension of the battery cell 10 in the first direction is L1, and the pressure relief mechanism 14 and the electrode terminal 13 are arranged sequentially along the first direction, the length dimension of the pressure relief mechanism 14 in the first direction is L2, the distance between the two electrode terminals 13 is L3, the dimension of the avoidance portion 21 is L4, and (L1-L3) / 2≤L4≤(L1-L2) / 2 is satisfied.

[0116] Among them, an electrode terminal 13 can be set on at least one side surface of the battery cell 10, the electrode terminal 13 can include a positive terminal and a negative terminal, and the positive terminal and the negative terminal can be at least one. The electrode terminal 13 can be arranged on at least one of the multiple surfaces of the battery cell 10, and the electrode terminal 13 can be located on the same side surface as the pressure relief mechanism 14.

[0117] Furthermore, in an embodiment where the first filter element 20 is relatively arranged in the second direction, the electrode terminal 13 and the pressure relief mechanism 14 are located on the same side surface, and the two are arranged sequentially along the first direction, the distance between two adjacent electrode terminals 13 (which may be a positive terminal and a negative terminal, or two positive terminals, or two negative terminals) on the side surface is L3, the length dimension of the battery cell 10 in the first direction is L1, the length dimension of the pressure relief mechanism 14 in the first direction is L2, and the size of the avoidance portion 21 is L4, which should satisfy (L1-L3) / 2≤L4≤(L1-L2) / 2.

[0118] That is to say, there are two avoidance parts 21, each corresponding to an electrode terminal 13, so as to avoid the boundary component connected to the electrode terminal 13, and the size of the avoidance part 21 is larger than the above-mentioned size range, so that the size of the part of the first filter element 20 located between adjacent electrode terminals 13 can be more reasonable, and the size of the part can be larger than the size of the pressure relief mechanism 14 and smaller than the distance between adjacent electrode terminals 13, so as to improve the barrier effect of the first filter element 20 on high-temperature particulate matter between adjacent battery cells 10, thereby improving safety and reliability.

[0119] like Figure 6 As shown, according to some embodiments of the present application, each first filter element 20 includes a plurality of sub-filter elements 22 , and the plurality of sub-filter elements 22 are arranged at intervals in the first direction and correspond one-to-one to the battery cells 10 .

[0120] Specifically, in an embodiment in which the first filter element 20 is constructed as a split structure, multiple sub-filter elements 22 can be arranged in sequence, and the multiple sub-filter elements 22 can be connected end to end, or can be arranged at intervals, but all correspond one to one with the battery cells 10. In the embodiment in which the sub-filter elements 22 are arranged at intervals, while meeting the corresponding protection effect, the material cost of the first filter element 20 can also be reduced.

[0121] like Figure 8 As shown, according to some embodiments of the present application, the size of the sub-filter 22 is L5, and satisfies L2≤L5≤L3.

[0122] That is to say, the size of the sub-filter element 22 is within the above-mentioned proportional range, so that the size of the sub-filter element 22 can be larger than the size of the pressure relief mechanism 14 and smaller than the distance between two adjacent electrode terminals 13, so as to improve the barrier and protection effect of the sub-filter element 22. At the same time, in the first direction, the area between adjacent sub-filter elements 22 can be formed into an avoidance gap, which can also achieve the same technical effect as the above-mentioned avoidance portion 21.

[0123] like Fig. 9 and Fig.10 As shown, according to some embodiments of the present application, the battery device 100 further includes: a box body, the box body defines a containing space, the battery cell 10 is disposed in the containing space, and the first filter element 20 is disposed between the box body and the battery cell 10 .

[0124] That is, the first filter element 20 is arranged in the accommodation space and is located between the box body and the battery cell 10, such as between the top inner wall of the box body and the battery cell 10, between the side inner wall and the battery cell 10, between the bottom inner wall and the battery cell 10, that is, arranged in the gap between the battery cell 10 and the box body, in which the high-temperature particles are screened and blocked, thereby effectively reducing the heat propagation speed between adjacent battery cells 10 and improving safety and reliability. Fig.10 As shown, according to some embodiments of the present application, the box body has a tray 31 and a cover plate 32 , and the first filter element 20 is integrated with the cover plate 32 , or the first filter element 20 is connected to the battery cell 10 .

[0125] It should be noted that the first filter element 20 can be fixed to the battery cell 10 or the box body by riveting, welding, hot melting, etc.

[0126] Among them, in the embodiment in which the first filter element 20 is connected to the battery cell 10, the difficulty of arranging the boundary components during the assembly process can be reduced and the assembly efficiency can be improved. In the embodiment in which the first filter element 20 is integrated with the cover plate 32, the difficulty of grouping the battery device 100 is lowered, the assembly tolerance can be reduced, and the assembly accuracy can be improved.

[0127] It should be noted that a water cooling plate structure may be further provided below the battery cell 10, or the battery cell 10 may be directly provided in the support plate structure on the tray 31, that is, Fig. 9 and Fig.10 The indicated tray 31 may actually be a support plate attached to the tray 31 , or a water cooling plate inside the tray 31 .

[0128] According to some embodiments of the present application, the battery cell 10 includes: a shell 11 and an end cover 12 , the end cover 12 is connected to the shell 11 , the end cover 12 is integrated with an electrode terminal 13 and a pressure relief mechanism 14 , and the first filter element 20 is arranged on the peripheral side of the end cover 12 .

[0129] Specifically, the end cover 12 and the shell 11 can be fixed by any structural form such as welding, clamping or plugging, and the pressure relief mechanism 14 and the electrode terminal 13 can be integrated on the end cover 12, and the corresponding first filter element 20 is also arranged on the peripheral side of the end cover 12, such as the first filter element 20 is connected to the cover plate 32 and is located on the peripheral side of the end cover 12, or the first filter element 20 is connected to the shell 11 and is located on the peripheral side of the cover plate 32. In some embodiments, the first filter element 20 can also be integrated with the cover plate 32, and this application does not impose further restrictions.

[0130] like Figure 11-Figure 15 As shown, according to some embodiments of the present application, a second filter element 15 is further provided on the end cover 12 . The second filter element 15 is located on a side of the end cover 12 facing the housing 11 or a side away from the housing 11 and directly opposite to the pressure relief mechanism 14 .

[0131] Specifically, a second filter element 15 is further arranged on the end cover 12 , and the second filter element 15 can achieve preliminary screening and blocking in the area where the pressure relief mechanism 14 is located, such as the inside of the pressure relief mechanism 14 or the outside of the pressure relief structure, while the first filter element 20 can achieve further screening and blocking between adjacent battery cells 10 .

[0132] That is to say, a second filter element 15 is further provided on the inner or outer side of the pressure relief mechanism 14, and the second filter element 15 can be used to block and screen out high-temperature particulate matter, and the first filter element 20 and the second filter element 15 can cooperate to achieve double screening and blocking effects, which can further improve the safety and reliability of the battery device 100.

[0133] According to some embodiments of the present application, the area of ​​the second filter element 15 is S1, the flow area of ​​the pressure relief mechanism 14 when it is opened is S2, and S1≥S2 is satisfied.

[0134] It should be noted that the second filter element 15 can be disposed on the end cap 12 by welding, hot melting, stamping, etc., and in some embodiments, the second filter element 15 can be located on the outside of the end cap 12 (see Fig.11 and Fig.12 In other embodiments, the second filter element 15 may be located on the inner side of the end cap 12 (see Fig.13 , Fig.14 ), of course, the end cover 12 can also be constructed as a double-layer plate body or a multi-layer plate body structure, the second filter element 15 is arranged between adjacent plates, and the pressure relief mechanism 14 is located on the outside or inside of the second filter element 15.

[0135] It can be understood that S1≥S2, and preferably, S1≥1.1S2, and more preferably, S1≥1.5S2.

[0136] Specifically, referring to the table below, taking a specific embodiment in which the filtration aperture of the second filter element 15 is 3 mm, the filtration effects of the second filter elements 15 of different areas are compared and displayed. The spray valve weight ratio refers to the percentage of high-temperature particulate matter sprayed out of the battery cell 10 to the weight of the battery cell when thermal runaway occurs in the battery cell 10. The pressure relief area corresponds to the maximum flow area when the pressure relief valve is opened.

[0137]

[0138] It can be seen from the above table that in Example 1, S1=S2, which is the control group, the spray valve weight ratio is 31.6%; in Comparative Examples 1-2, S1<S2, compared with the control group, the spray valve weight ratio is slightly decreased, which means that the pressure relief area is partially occupied and does not meet the requirements; in Examples 2-3, S1≥1.1S2, the spray valve weight ratio is slightly increased compared with the control group, which means that the occupied part of the pressure relief area is released; in Examples 4-5, S1≥1.5S2, the spray valve weight ratio is further increased, which means that the occupied part of the pressure relief area is released to a greater extent.

[0139] That is to say, the area of ​​the second filter element 15 of the present application is greater than or equal to the flow area of ​​the pressure relief mechanism 14. On the premise that the second filter element 15 has a stable and reliable screening and blocking effect, the flow area of ​​the pressure relief mechanism 14 can also be kept stable, thereby preventing the second filter element 15 from occupying too much of the pressure relief area due to the second filter element 15 being too small, thereby ensuring that the pressure relief effect of the pressure relief mechanism 14 can remain stable and reliable.

[0140] According to some embodiments of the present application, the connection strength between the shell 11 and the end cover 12 is Q1, the structural strength of the second filter element 15 is Q2, the connection strength between the second filter element 15 and the end cover 12 is Q3, and Q3>Q1>Q2 is satisfied.

[0141] In this way, when the battery cell 10 is subjected to greater pressure, the shell 11 and the end cover 12 will not be disengaged when the pressure relief mechanism 14 is opened under pressure, and the second filter chamber and the end cover 12 will not be disengaged when the pressure relief mechanism 14 is opened, so as to ensure the fixing stability and reliability of the second filter element 15, reduce the probability of the second filter element 15 falling off, and make the filtering function of the second filter element 15 stable and reliable.

[0142] According to some embodiments of the present application, the first filter element 20 and the second filter element 15 are both configured as filter screens, and the pore size R of the filter screens satisfies: 0.02 mm ≤ R < 5 mm.

[0143] Specifically, see Fig.16As shown, in some embodiments, the holes of the filter screen can be rectangular, rhombus, triangular, etc., and the pore size of the filter screen is the maximum inscribed circle diameter of the hole. The measurement method can refer to GB / T 32045-2015 "Determination of flow average pore size in permeable sintered metal materials", such as Fig.17 As shown, in other embodiments, the holes of the filter are circular, and the hole diameter is the diameter.

[0144] Further, see the table below, which is a comparison table of the pore size of the first filter element 20 and the transfer weight ratio, wherein the transfer weight ratio refers to the ratio of the weight of the accumulated particulate matter on the surface of the adjacent battery cell 10 to the weight of the high-temperature particulate matter in the thermal runaway battery cell 10.

[0145]

[0146] Among them, the comparative example 1 in which the first filter element 20 is not placed is taken as the control group. In the comparative example 1, the transfer weight ratio is 22.5%. In the comparative example 2, the aperture K is less than 0.02mm, the aperture is too small, and the particulate matter can hardly pass through the screen, and the transfer weight ratio is 0%, but at the same time the exhaust path is also blocked, resulting in a high pressure on the upper part of the runaway battery cell 10, and there is a risk of explosion, which does not meet the requirements; in the comparative examples 3-4, the aperture K is greater than 5mm, and the transfer weight ratio is slightly lower than that of the control group, but the transfer weight ratio is still too high, which does not meet the functional requirements, and the effect of delaying the spread speed of thermal runaway is not obvious; in the embodiments 1-2, 0.02mm≤aperture K≤5mm, the transfer weight ratio is significantly reduced, and the screening effect is better; in the following embodiments 3-4, 0.02mm≤aperture K≤1mm, the transfer weight ratio is further reduced, and the screening effect is better than that of the embodiments 1-2; in the following embodiments 5-6, 0.02mm≤aperture K≤0.6mm, the transfer weight ratio is greatly reduced, the screening effect is optimal, and the exhaust is not affected.

[0147] Further, see the table below, which is a comparison table of the pore size and transfer weight ratio of the second filter element 15, wherein the spray valve weight ratio refers to the percentage of high-temperature particulate matter sprayed out of the battery cell 10 to the weight of the battery cell when the battery cell 10 has thermal runaway.

[0148]

[0149] As shown in the table above, Example 1 is used as the control group. Example 1 does not have the second filter element 15, and the spray valve weight ratio is about 43.1%; in Example 2, the aperture is too small, resulting in the battery cell 10 being unable to release pressure normally, resulting in the possibility of explosion of the battery cell 10, which does not meet the requirements; in Example 3-4, the aperture is greater than 5mm, the spray valve weight ratio is not much different from the spray valve weight of the screenless group, the screening effect is not good, and does not meet the requirements; in Example 1-2, 0.02mm≤K≤5mm, the spray valve weight ratio is lower than that of the control group, and the screening effect is good; in the following Examples 3-4, 0.02mm ≤K≤1mm, the spray valve weight ratio is significantly lower than that of the control group, and is better than Example 1-2, and the screening effect is excellent; in Example 5-6, 0.02mm ≤K≤0.6mm, the spray valve weight ratio is greatly reduced compared with the control group, and the screening effect is the best.

[0150] In summary, the present application provides the first filter element 20 and the second filter element 15 with more reasonable pore sizes, thereby improving the filtering effect and effectively filtering out high-temperature particulate matter, thereby improving the safety and reliability of the battery device 100.

[0151] Among them, the first filter element 20 and the second filter element 15 can be made of the same material or different materials, and the melting points of the first filter element 20 and the second filter element 15 are both greater than or equal to 950 degrees Celsius, so that when the battery cell 10 has thermal runaway, the first filter element 20 and the second filter element 15 both have reliable and stable filtering effects. The first filter element 20 and the second filter element 15 can be made of tungsten, molybdenum, titanium alloy, cobalt-based alloy, nickel-based superalloy, silicon carbide (SiC), boron carbide (B4C), aluminum oxide (Al2O3) and other materials. Titanium alloy, silicon carbide (SiC), boron carbide (B4C) are preferably selected to have high bending strength while ensuring a high melting point, which can improve the structural strength and service life of the first filter element 20 and the second filter element 15.

[0152] It should be pointed out that regarding the measurement method of melting point, the corresponding national standard can be selected according to its material; for example, plastic materials are based on GB / T 8927-2008 "Determination of Melting Point of Plastics Using Differential Scanning Calorimetry (DSC)", and metal materials are based on GB / T1507.1-2005 "Terms of Thermal Analysis of Metallic Materials" and GB / T 1507.2-2005 "Thermal Analysis Methods of Metallic Materials".

[0153] In a second aspect, the present application proposes an electrical device 200 , comprising: the battery device 100 in the above embodiment.

[0154] In a specific embodiment of the present application, the battery cells 10 are arranged in an array along a first direction and a second direction, and a relative first filter element 20 is provided in at least the first direction or the second direction, and a avoidance portion 21 is provided in the area of ​​the first filter element 20 corresponding to the electrode terminal 13, and a second filter element 15 is integrated on the end cover 12 of the battery cell 10. The first filter element 20 cooperates with the second filter element 15 to effectively screen out high-temperature particulate matter ejected outward from the battery cell 10 that has thermal runaway, reduce the thermal runaway propagation speed between adjacent battery cells 10, and improve safety and reliability.

[0155] Other structures and operations of the battery device 100 and the power-consuming device 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0156] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0157] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A battery cell (10), wherein the battery cell (10) is multiple and the multiple battery cells (10) are arranged in sequence; A first filter element (20), the first filter element (20) being located on the peripheral side of the surface of the battery cell (10) having the pressure relief mechanism (14), and being located between adjacent battery cells (10).

2. The battery device according to claim 1, characterized in that: The battery cells (10) are arranged in rows along a first direction and in columns along a second direction, the first direction being perpendicular to the second direction, and a plurality of first filters (20) are arranged on both sides of each of the battery cells (10) along the first direction and / or on both sides of each of the battery cells (10) along the second direction.

3. The battery device according to claim 2, characterized in that: The first filter element (20) is provided with an avoidance portion (21), and the avoidance portion (21) is used to avoid a boundary component electrically connected to the battery cell (10).

4. The battery device according to claim 3, characterized in that: The dimension of the battery cell (10) in the first direction is L1, and the pressure relief mechanism (14) and the electrode terminal (13) are arranged in sequence along the first direction, the length dimension of the pressure relief mechanism (14) in the first direction is L2, the distance between the two electrode terminals (13) is L3, the dimension of the avoidance portion (21) is L4, and (L1-L3) / 2≤L4≤(L1-L2) / 2 is satisfied.

5. The battery device according to claim 2, characterized in that: Each of the first filter elements (20) comprises a plurality of sub-filter elements (22), and the plurality of sub-filter elements (22) are arranged at intervals in the first direction and correspond one-to-one to the battery cells (10).

6. The battery device according to claim 5, characterized in that: The sub-filter element (22) has a size of L5 and satisfies L2≤L5≤L3.

7. The battery device according to claim 1, characterized in that: The battery device further comprises a box body, the box body defining an accommodation space, the battery cell (10) being arranged in the accommodation space, and the first filter element (20) being arranged between the box body and the battery cell (10).

8. The battery device according to claim 7, characterized in that: The box body comprises a tray (31) and a cover plate (32); the first filter element (20) is integrated with the cover plate (32), or the first filter element (20) is connected to the battery cell (10).

9. The battery device according to claim 1, characterized in that: The battery cell (10) comprises: a housing (11) and an end cover (12); the end cover (12) is connected to the housing (11); an electrode terminal (13) and a pressure relief mechanism (14) are integrated on the end cover (12); and the first filter element (20) is arranged on the peripheral side of the end cover (12).

10. The battery device according to claim 9, characterized in that: A second filter element (15) is also provided on the end cover (12). The second filter element (15) is located on a side of the end cover (12) facing the housing (11) or on a side away from the housing (11) and directly opposite to the pressure relief mechanism (14).

11. The battery device according to claim 10, characterized in that: The area of ​​the second filter element (15) is S1, the flow area of ​​the pressure relief mechanism (14) when it is opened is S2, and S1≥S2 is satisfied.

12. The battery device according to claim 10, characterized in that: The connection strength between the housing (11) and the end cover (12) is Q1, the structural strength of the second filter element (15) is Q2, the connection strength between the second filter element (15) and the end cover (12) is Q3, and Q3>Q1>Q2 is satisfied.

13. The battery device according to any one of claims 1 to 12, characterized in that: The first filter element (20) and the second filter element (15) are both configured as filter screens, and the pore size R of the filter screens satisfies: 0.02 mm ≤ R < 5 mm.

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

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