Battery monomer, battery device and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a shell, at least one end of which is provided with an opening; the top cover is connected to the opening, and a pressure relief opening is formed in the top cover; the anti-explosion valve is arranged at the pressure relief opening; the mesh screen layering part is located on the side, close to the shell, of the anti-explosion valve, is opposite to the pressure relief opening and is configured to allow gas in the shell to pass through and be discharged from the pressure relief opening; and in the direction parallel to the top cover, the extension direction of the screen surface of the mesh screen layering piece is inclined relative to the direction. According to the gas-solid separation device, solid particles in discharged gas are efficiently intercepted while the gas is smoothly discharged, the gas-solid separation efficiency is improved, the safety in the pressure relief process is ensured, and the safety performance of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Battery devices are widely used in electronic equipment, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools. Under the condition of short circuit, overcharge and the like, a certain amount of high-temperature and high-pressure gas may be generated in the battery device, and when the generated gas increases to a certain extent, a thermal runaway phenomenon will occur. However, the gas generated by thermal runaway contains a large amount of solid particles, and the solid particles are ejected outside together with the gas and mixed with air, which is easy to cause the risk of fire and combustion, and the safety performance of the battery device is relatively low. CONTENT OF THE INVENTION

[0003] In view of the above problems, the present application provides a battery monomer, a battery device and a power utilization device, which ensures the smooth discharge of gas, realizes efficient interception of solid particles in the discharged gas, improves the gas-solid separation efficiency, guarantees the safety of the pressure relief process, and improves the safety performance of the battery device.

[0004] In a first aspect, the present application provides a battery monomer, comprising: a shell, at least one end of which is configured with an opening; a top cover connected to the opening, the top cover being configured with a pressure relief port; an explosion-proof valve arranged at the pressure relief port; a mesh screen layering piece located on the side of the explosion-proof valve close to the shell and opposite to the pressure relief port, configured to pass the gas in the shell and discharge from the pressure relief port; wherein, in a direction parallel to the top cover, the extending direction of the screen surface of the mesh screen layering piece is inclined relative to the direction.

[0005] In the technical scheme of the present application, the mesh screen layering piece is arranged, and the extending direction thereof is inclined relative to the direction parallel to the top cover. When the battery monomer is in thermal runaway, the high-speed ejected gas entrains solid particles and impacts the mesh screen, and the inclined screen surface generates an oblique resistance to the solid particles, so as to ensure the smooth discharge of gas, change the motion trajectory of the solid particles through the angle guide, make the solid particles more easily intercepted on the surface of the mesh screen, improve the interception efficiency, reduce the risk of directly passing through the mesh hole and discharging from the pressure relief port, further reduce the risk of fire and combustion caused by the mixing of the ejected solid particles and the gas, guarantee the safety of the pressure relief process, and improve the safety performance of the battery device.

[0006] In some embodiments, the inclination angle of the extending direction of the screen surface of the mesh screen layering piece is A, and the A satisfies the condition: 5°≤A≤15°.

[0007] By setting the tilt angle A of the screen surface relative to the direction parallel to the top cover between 5° and 15°, the solid particles can be more easily collided with the screen surface and intercepted by the movement trajectory of the solid particles; moreover, the tilt angle is moderate, so as not to excessively increase the resistance to gas passage and reduce the pressure accumulation inside the shell.

[0008] In some embodiments, the mesh layering element comprises a plurality of mesh wires connected to each other.

[0009] By setting up multiple interconnected mesh wires, the resulting mesh structure can provide sufficient channels for gas to pass through, ensuring smooth pressure relief, and can also effectively block solid particles entrained in the gas through the interception effect of the mesh wires.

[0010] In some embodiments, the average spacing between two adjacent mesh wires is d1, wherein d1 satisfies the condition: 2μm≤d1≤5μm.

[0011] By setting the average distance d1 between two adjacent mesh wires between 2μm and 5μm, it is possible to ensure that the gas can be smoothly discharged through the gas channel, while effectively intercepting solid particles in the discharged gas, thereby improving the gas-solid separation efficiency and reducing the risk of fire caused by solid particles after they are ejected.

[0012] In some embodiments, the shape of the mesh wire includes at least one of straight, curved, or zigzag shapes.

[0013] By setting diverse mesh shapes, the probability of intercepting solid particles of different sizes and trajectories can be increased while ensuring smooth gas passage, thus enhancing the gas-solid separation effect.

[0014] In some embodiments, the mesh screen layer comprises multiple layers along the thickness direction of the top cover, with the extension directions of adjacent mesh screen layers arranged in a cross pattern.

[0015] By setting up multi-layered mesh screens with adjacent layers extending in a cross direction, a three-dimensional, interwoven interception network can be formed. This helps reduce blind spots and improves the overall blocking effect on solid particles while ensuring gas flow, thus enhancing the safety performance during the depressurization process of individual battery cells.

[0016] In some embodiments, the mesh layer completely covers the pressure relief port in the orthographic projection of the top cover.

[0017] By setting the mesh screen layer to completely cover the pressure relief port in the orthogonal projection of the top cover, it can be ensured that the gas and solid particles in it flowing from the inside of the shell through the pressure relief channel to the pressure relief port must pass through the mesh screen layer, reducing the amount of unintercepted solid particles that are directly discharged from the pressure relief port, thereby maximizing the separation effect.

[0018] In some embodiments, a separator is also included, which is located on the side of the top cover near the opening and connected to the top cover; the mesh screen layer is disposed on the top cover.

[0019] By setting up an isolation component, the internal electrode assembly and the top cover can be isolated, reducing the risk of short circuits and corrosion caused by direct contact between the electrode assembly and the metal parts of the top cover; at the same time, it can provide stable support for the screen layer components.

[0020] In some embodiments, the isolation member has a through pressure relief channel along its thickness direction, the pressure relief channel connecting the interior of the housing with the pressure relief port, and the screen layer is disposed in the pressure relief channel.

[0021] By setting up a pressure relief channel, the gas and solid particles discharged from inside the casing can be concentrated through the pressure relief channel, which helps to ensure that the interception components can effectively intercept them.

[0022] In some embodiments, the isolation element includes an isolation body and a fixing structure;

[0023] The fixing structure protrudes from at least a portion of the isolation body toward the opening and is arranged around the inner edge of the pressure relief channel; the mesh screen layer is connected to the fixing structure;

[0024] The fixing structure and the isolation body together define a bending space for accommodating the tab.

[0025] By setting up a fixed structure that surrounds the inner edge of the pressure relief channel, the channel can be structurally reinforced, reducing the impact damage to the isolation body when high-temperature, high-pressure gas passes through it. Furthermore, the design of the bending space constrains the layout of the electrode tabs, making the internal structure of the battery cell more compact and orderly, improving space utilization, and thus enhancing the safety and reliability of the battery cell.

[0026] In some embodiments, the vertical distance between the end face of the fixing structure and the isolation body is d2, and d2 satisfies the condition: 3mm≤d2≤9mm.

[0027] By setting d2 within the range of 3mm to 9mm, sufficient and appropriate space can be provided for the bending part of the tab, ensuring the assembly stability of the tab, avoiding poor contact with other structures, and ensuring conductivity and safety; at the same time, it will not occupy too much internal space, maintaining the structural compactness of the battery cell and ensuring the normal function of the pressure relief channel.

[0028] In some embodiments, the surface of the screen layer is coated with an insulating coating.

[0029] By coating the surface of the screen layer with an insulating coating, the insulation performance can be maintained in the high-temperature environment of thermal runaway of battery cells, thus reducing the risk of short circuit.

[0030] In some embodiments, at least one end of the isolation member extends along its length direction and has an exhaust end that protrudes toward the opening side and has a plurality of exhaust holes.

[0031] By setting an exhaust end, the gas inside the housing can be guided to converge towards the opening. The multiple exhaust holes provide multiple paths for gas discharge, effectively reducing local gas accumulation inside the housing. At the same time, the distribution of multiple exhaust holes can disperse the impact force when gas is discharged. It is understandable that the exhaust end is located on the side of the isolation component, which facilitates the passage of gas from the side in the event of thermal runaway.

[0032] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0033] When the battery device provided in this application embodiment is in use, the mesh screen is arranged with its extension direction inclined relative to the direction parallel to the top cover. When a battery cell experiences thermal runaway, the high-speed ejected gas carries solid particles and impacts the mesh screen. The inclined screen surface generates oblique resistance to the solid particles, thereby ensuring smooth gas discharge while guiding and changing the trajectory of the solid particles through angle. This makes it easier for the solid particles to be intercepted on the screen surface, improving interception efficiency and reducing the risk of them directly passing through the mesh and being discharged from the pressure relief port. This reduces the risk of solid particles mixing with the gas after being ejected and causing fire, ensuring the safety of the pressure relief process and improving the safety performance of the battery device.

[0034] Thirdly, this application provides an electrical device, including the battery device in the above embodiments, wherein the battery device is used to provide electrical energy.

[0035] When the electrical device provided in this application embodiment is in use, the battery device composed of the battery cells provided in this application embodiment provides electrical energy to the electrical device. By setting the mesh screen layered component, its extension direction is inclined relative to the direction parallel to the top cover. When the battery cell experiences thermal runaway, the high-speed ejected gas carries solid particles and impacts the mesh screen. The inclined screen surface generates oblique resistance to the solid particles, thereby ensuring the smooth discharge of gas while guiding and changing the trajectory of the solid particles through the angle, making it easier for the solid particles to be intercepted on the mesh screen surface, improving the interception efficiency, reducing the risk of directly passing through the mesh and being discharged from the pressure relief port, and thus reducing the risk of solid particles mixing with the gas after being ejected and causing fire and combustion, ensuring the safety of the pressure relief process, and improving the safety performance of the battery device.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

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

[0038] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle.

[0039] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0040] Figure 3 Cross-sectional views of a battery cell provided in some embodiments of this application.

[0041] Figure 4 This is an exploded structural diagram of the top cover of a battery cell provided in some embodiments of this application.

[0042] Figure 5 This is a schematic diagram of the structure of the separator of a battery cell provided in some embodiments of this application.

[0043] Figure 6 This is a schematic diagram of the structure of the mesh layering component of a battery cell provided in some embodiments of this application.

[0044] Figure 7 This is a schematic diagram of a single-layer mesh screen component provided in some embodiments of this application.

[0045] Figure 8 The diagram shows a two-layer structure of the mesh screen provided in some embodiments of this application.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] 10000 - Vehicles;

[0048] 1000-battery;

[0049] 1100-cell battery;

[0050] 100 - Housing; 110 - Through hole; 120 - Positive terminal; 130 - Negative terminal; 140 - Explosion-proof valve; 150 - Protective patch; 160 - Sealing ring;

[0051] 200 - Top cover; 210 - Pressure relief port;

[0052] 300 - Mesh screen layer; 310 - Mesh wire;

[0053] 400 - Isolation component; 410 - Isolation body; 420 - Fixing structure; 430 - Bending space; 440 - Exhaust end; 441 - Exhaust port; 450 - Pressure relief channel;

[0054] 1200 - Box body; 1210 - Storage space; 1220 - First section; 1230 - Second section;

[0055] 2000-Controller;

[0056] 3000-motor. Detailed Implementation

[0057] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0063] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0065] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0066] Battery devices may generate a certain amount of high-temperature, high-pressure gas under conditions such as short circuits and overcharging. When the generated gas increases to a certain level, it can lead to thermal runaway. However, the gas generated by thermal runaway contains a large number of solid particles. When these solid particles are ejected into the outside and mix with the air, they can easily cause a fire, resulting in low safety performance of the battery device.

[0067] Based on the above considerations, in order to achieve efficient separation of solid particles in the discharged gas while ensuring smooth gas discharge, this application provides a battery cell with a screen layered component whose extension direction is inclined relative to the direction parallel to the top cover. When the battery cell experiences thermal runaway, the high-speed ejected gas carries solid particles and impacts the screen. The inclined screen surface generates oblique resistance to the solid particles, thereby ensuring smooth gas discharge while guiding and altering the trajectory of the solid particles through angle. This makes it easier for the solid particles to be intercepted on the screen surface, improving interception efficiency, reducing the risk of them directly passing through the mesh and being discharged from the pressure relief port, and further reducing the risk of solid particles mixing with the gas and causing fire, ensuring the safety of the pressure relief process and improving the safety performance of the battery device.

[0068] The power batteries manufactured using the battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0069] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0070] Please see Figure 1 , Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0071] Vehicle 10000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Vehicle 10000 has a battery internally installed, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power vehicle 10000; for example, it can serve as the operating power source for vehicle 10000. Vehicle 10000 may also include a controller and a motor. The controller is used to control the battery to power the motor, for example, to meet the power needs of vehicle 10000 during starting, navigation, and driving.

[0072] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle 10000, but also as the driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0073] Please see Figure 2 , Figure 2 Exploded views of batteries provided for some embodiments of this application.

[0074] The battery 1000 includes a housing 1200 and battery cells 1100, with the battery cells 1100 housed within the housing 1200. The housing 1200 provides a receiving space 1210 for the battery cells 1100, and the housing 1200 can adopt various structures. In some embodiments, the housing 1200 may include a first portion 1220 and a second portion 1230, which overlap each other, and together define the receiving space 1210 for accommodating the battery cells 1100. The second part 1230 can be a hollow structure with one end open, and the first part 1220 can be a plate-like structure. The first part 1220 covers the open side of the second part 1230 so that the first part 1220 and the second part 1230 together define the receiving space 1210. Alternatively, the first part 1220 and the second part 1230 can both be hollow structures with one side open, and the open side of the first part 1220 covers the open side of the second part 1230. Of course, the box 1200 formed by the first part 1220 and the second part 1230 can be of various shapes, such as a cylinder, a cuboid, etc.

[0075] In battery 1000, there can be multiple battery cells 1100. These multiple battery cells 1100 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 1100 are connected in both series and parallel. Multiple battery cells 1100 can be directly connected in series, parallel, or in a mixed configuration and then housed within housing 1200. Alternatively, battery 1000 can also consist of multiple battery cells 1100 first connected in series, parallel, or in a mixed configuration to form a battery module, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 1200. Battery 1000 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 1100.

[0076] Each battery cell 1100 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 1100 can be cylindrical, flat, cuboid, or other shapes.

[0077] A battery cell 1100 refers to the smallest unit that makes up a battery 1000. A battery cell 1100 includes a casing 100, a top cover 200, a cell assembly, and other functional components.

[0078] The top cover 200 refers to a component that closes onto the opening of the housing 100 to isolate the internal environment of the battery cell 1100 from the external environment. The shape of the top cover 200 can be adapted to the shape of the housing 100 to fit it. Optionally, the top cover 200 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 200 is less prone to deformation under pressure and impact, allowing the battery cell 1100 to have higher structural strength and improved safety performance. Functional components such as a positive terminal 120 and a negative terminal 130 can be provided on the top cover 200. The positive terminal 120 and the negative terminal 130 can be used for electrical connection with the cell assembly to output or input electrical energy to the battery cell 1100. In some embodiments, the top cover 200 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 1100 reaches a threshold. The top cover 200 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the top cover 200. The insulating structure can be used to isolate the electrical connection components inside the housing 100 from the top cover 200 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0079] The housing 100 is a component used to cooperate with the top cover 200 to form the internal environment of the battery cell 1100, wherein the formed internal environment can accommodate the cell assembly, electrolyte, and other components. The housing 100 and the top cover 200 can be independent components. An opening can be provided on the housing 100, and the top cover 200 closes the opening to form the internal environment of the battery cell 1100. Alternatively, the top cover 200 and the housing 100 can be integrated. Specifically, the top cover 200 and the housing 100 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 100, the top cover 200 closes onto the housing 100. The housing 100 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 100 can be determined according to the specific shape and size of the battery cell assembly. The shell 100 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0080] A cell assembly is the component within a single battery cell 1100 where an electrochemical reaction occurs. The casing 100 may contain one or more cell assemblies. The cell assembly is primarily formed by stacking composite strips, which are thermally bonded together with a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. The portions of the positive and negative electrodes containing active material constitute the main body of the cell assembly, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery device, the positive and negative active materials react with the electrolyte, and the tabs connect the positive electrode post 120 and the negative electrode post 130 to form a current loop.

[0081] The following is a detailed description of the structure of a single battery cell. Please refer to [link / reference]. Figures 3-8 , Figure 3 Cross-sectional views of battery cells provided in some embodiments are shown. Figure 4 An exploded structural diagram of the top cover of a battery cell provided in some embodiments is shown. Figure 5 The diagram shows a schematic representation of the structure of the separator for a battery cell provided in some embodiments. Figure 6 The diagram shows a structural schematic of the screen layered component of a battery cell provided in some embodiments. Figure 7 The diagram shows a structural schematic of a single-layer screen element provided in some embodiments. Figure 8 A schematic diagram of a two-layer mesh screen is shown in some embodiments.

[0082] Please see Figure 3 and Figure 4As shown, this application provides a battery cell 1100. In this embodiment, the battery cell 1100 is mainly described as a prismatic battery.

[0083] like Figure 3 and Figure 4 The battery cell 1100 includes a housing 100, a top cover 200 and an explosion-proof valve 140. At least one end of the housing 100 is provided with an opening, the top cover 200 is connected to the opening, the top cover 200 is provided with a pressure relief port 210, and the explosion-proof valve 140 is disposed at the pressure relief port 210.

[0084] It should be noted that the battery cell 1100 provided in this embodiment adopts a split structure design, consisting of a housing 100 and a top cover 200. The housing 100 and the top cover 200 are tightly connected, forming a closed cavity to accommodate components such as the battery cell assembly. The housing 100 and the top cover 200 cooperate in terms of material properties and structural design to jointly constitute the safety protection system of the battery cell 1100, ensuring the stable operation of the battery cell 1100 during charging and discharging.

[0085] like Figure 4 The top cover 200 has a pressure relief port 210. This port is a through-hole that extends along the thickness of the top cover 200, penetrating both the inner and outer surfaces to form a connecting channel, thus ensuring pressure can be released through this channel. An explosion-proof valve 140 is located at the pressure relief port 210, and a protective patch 150 is placed on top of the valve. Initially, the pressure relief port 210 is sealed. When the internal pressure of the battery reaches a threshold, the explosion-proof valve 140 opens, allowing the pressure relief port 210 to connect the inside and outside, thus releasing pressure.

[0086] like Figure 3 and Figure 4 The battery cell 1100 includes a separator 400, which is located on the side of the top cover 200 near the opening and connected to the top cover 200. The top cover 200 can be snapped into the separator 400. The positive terminal 120 and the negative terminal 130 are fixedly mounted on the top cover 200 at intervals. Both the top cover 200 and the separator 400 have through holes 110, allowing the positive terminal 120 and the negative terminal 130 to communicate with the inside and outside of the battery cell 1100. During installation, the periphery of the through hole 110 has an annular boss, onto which a sealing ring 160 is fitted, facilitating the installation of the positive terminal 120 and the negative terminal 130.

[0087] The isolator 400 can be an insulating plastic sheet, which mainly serves the functions of insulation, support, and sealing. Specifically, by setting the isolator 400, short circuits between the positive and negative electrodes can be prevented, and it can also isolate the internal electrode assembly of the housing 100 from the top cover 200, reducing the risk of short circuits, corrosion, and other problems caused by direct contact between the electrode assembly and the metal parts of the top cover 200.

[0088] To ensure the smooth discharge of gas while efficiently intercepting solid particles in the discharged gas, in some embodiments, such as Figures 3 to 5 The battery cell 1100 includes a mesh screen layer 300 located on the side of the explosion-proof valve 140 near the housing 100 and opposite the pressure relief port 210, configured to allow gas in the housing 100 to pass through and be discharged from the pressure relief port 210; wherein, as Figure 3 In a direction parallel to the top cover 200, the screen surface of the mesh layer 300 is inclined relative to this direction and is configured to block solid particles in the discharged gas.

[0089] The location of the screen layering component 300 is not limited. The screen layering component 300 can be set on the top cover 200, or it can be set between the top cover 200 and the isolation component 400; or it can be set on the isolation component 400.

[0090] In this embodiment, the example of the screen layer component 300 being disposed on the isolation component 400 is mainly used for explanation. The isolation component 400 can provide stable support for the screen layer component 300; moreover, since the isolation component 400 is located between the housing 100 and the top cover 200, fixing the screen layer component 300 here is equivalent to setting up a high-efficiency filtration barrier in advance on the path of gas flow to the pressure relief port 210, which helps to extend the gas flow path, providing more space and time for gas-solid separation, and significantly improving the interception effect.

[0091] The connection method between the screen layer component 300 and the isolation component 400 is not limited and can be installed according to actual needs. Furthermore, since the screen layer component 300 is opposite to the pressure relief port 210, it can be understood that the centerline of the screen layer component 300 and the centerline of the pressure relief port 210 can coincide or be parallel, so that the airflow direction is perpendicular to the interception surface, maximizing interception efficiency.

[0092] in, Figure 3 and Figure 4 In the diagram, the z-direction is the airflow direction, and the x-direction is the direction parallel to the top cover 200.

[0093] In this embodiment, the screen surface of the mesh screen layering component 300 extends at an angle relative to the horizontal direction. This means that when the top cover 200 is placed horizontally, the direction parallel to the top cover 200 is considered horizontal, and the screen surface of the mesh screen layering component 300 extends at an angle relative to the horizontal direction. This angle can be upwards or downwards. Symmetry is not limited in this embodiment.

[0094] Thus, when the internal pressure of the battery cell 1100 increases and triggers the explosion-proof valve 140 to open, the high-pressure gas and the solid particles it carries will be ejected at high speed through the pressure relief port 210. The gas is ejected axially along the pressure relief port 210, impacting the screen layer 300. The screen allows the gas to pass through, but the screen design reduces the gas flow rate and promotes particle settling. Among them, large solid particles cannot be well oriented with the airflow due to inertia. After impacting the screen surface, they fall into the housing 100 under the action of gravity. Small particles adhere to the screen surface due to static electricity or van der Waals forces.

[0095] Among them, the main components of the gas released by the thermal runaway of the 1100 battery cell are hydrogen, carbon monoxide and alkane gases. During the thermal runaway process, since the internal temperature of the cell is generally greater than 180°C, on the one hand, the bonding effect of the internal active materials deteriorates, and they can be discharged to the outside along with the thermal runaway gas. On the other hand, the aluminum beads generated by the thermal melting of aluminum foil at high temperature are also easily carried out of the cell along with the thermal runaway gas. Under the condition that the external air provides sufficient oxygen, it may cause the high-temperature solid particles ejected by the thermal runaway to ignite the thermal runaway gas solid.

[0096] Therefore, in the technical solution of this application embodiment, by setting the isolation component 400, it can isolate the internal electrode assembly of the housing 100 from the top cover 200, reducing the risk of short circuits and corrosion caused by direct contact between the electrode assembly and the metal parts of the top cover 200; at the same time, it can provide stable support for the screen layer component 300. By setting the screen layer component 300, its extension direction is inclined relative to the direction parallel to the top cover 200. When the battery cell 1100 thermally runs away, the high-speed ejected gas carries solid particles and impacts the screen. The inclined screen surface will generate oblique resistance to the solid particles, thereby ensuring that the gas is discharged smoothly, while guiding the movement trajectory of the solid particles by the angle, making it easier for the solid particles to be intercepted on the screen surface, improving the interception efficiency, reducing the risk of directly passing through the mesh and being discharged from the pressure relief port 210, and thus reducing the risk of solid particles mixing with the gas after being ejected and causing fire and combustion, ensuring the safety of the pressure relief process, and improving the safety performance of the battery device.

[0097] In some of these embodiments, such as Figure 3 The angle of inclination of the screen surface extension direction of the screen layer component 300 relative to the direction parallel to the top cover 200 can be A, and A can satisfy the condition: 5°≤A≤15°.

[0098] In some of these embodiments, such as Figure 3 The tilt angle A can be 5°, 6°, 8°, 10°, 15°, or any value between 5° and 15°. This embodiment does not limit this value; it can be set according to actual needs.

[0099] If the tilt angle A is less than 5°, the screen surface is nearly parallel to the direction parallel to the top cover 20°, and its effect on changing the trajectory of solid particles is weak. At this time, particles are more likely to pass directly through the mesh gaps of the screen along the airflow direction due to inertia, resulting in limited improvement in interception effect.

[0100] If the tilt angle A is greater than 15°, the angle between the screen surface and the direction parallel to the top cover 200 will be too large, significantly increasing the resistance of gas passing through the screen. The flow velocity of high-temperature and high-pressure gas inside the shell 100 will be obstructed, which may lead to untimely pressure discharge, excessive pressure accumulation inside the shell 100, and even the risk of deformation of the shell 100 due to a sudden increase in pressure. At the same time, an excessively large tilt angle will also increase the airflow impact force on the screen surface, which may easily cause damage such as wire deformation and breakage under long-term use or extreme conditions, affecting the structural stability and service life of the screen layering component 300.

[0101] By setting the tilt angle A of the screen surface relative to the direction parallel to the top cover 200 between 5° and 15°, the solid particles can be more easily collided with the screen surface and intercepted by the movement trajectory of the solid particles; moreover, the tilt angle is moderate, so as not to excessively increase the resistance to gas passage and reduce the pressure accumulation inside the shell 100.

[0102] In some of these embodiments, such as Figure 5 and Figure 6 The mesh screen layer 300 may include a plurality of mesh wires 310 connected to each other.

[0103] It is understood that the main structure of the mesh screen layer 300 is formed by connecting several independent mesh wires 310 together through methods such as crossing, welding, or weaving. These mesh wires 310 together constitute a mesh structure with grid gaps. The arrangement of the mesh wires 310 is not limited.

[0104] In some of these embodiments, such as Figure 6 The mesh 310 can be arranged in an orderly manner, crossing regularly in the horizontal, vertical, or specific angles. This helps to ensure the uniformity of the mesh gaps and makes the airflow more stable; or, as... Figure 5 The mesh 310 can also exhibit slight offsets or localized staggered angle changes within an ordered framework, which helps increase the probability of collision between solid particles and the mesh 310. This is not limited in the embodiments of this application.

[0105] By setting multiple interconnected mesh wires 310, the resulting mesh structure can provide sufficient channels for gas to pass through, ensuring smooth pressure relief, and can also effectively block solid particles entrained in the gas through the interception effect of the mesh wires 310.

[0106] In some of these embodiments, such as Figure 7and Figure 8 The average spacing between two adjacent mesh wires 310 can be d1, and d1 can satisfy the condition: 2μm≤d1≤5μm.

[0107] It should be noted that the average distance d1 can be measured as follows: within the effective interception area of ​​the mesh 310 layer, multiple groups of adjacent mesh 310 are randomly selected. For each group of adjacent mesh 310, the shortest straight distance between their edges is measured. All measured edge spacing values ​​are statistically analyzed, and their average value is calculated, which is the average distance d1.

[0108] If d1 is less than 2μm, the gap between adjacent wires 310 is too narrow, which increases the resistance to gas passage and slows down the gas discharge speed inside the shell 100, which may cause pressure accumulation and affect the pressure relief efficiency. At the same time, the narrow gap is easily blocked by intercepted solid particles, further hindering gas flow.

[0109] If d1 is greater than 5μm, the gap between the wires 310 is too large. When the battery cell 1100 experiences thermal runaway, the interception efficiency of the fine solid particles generated is poor. The solid particles may pass through the gap with the gas and be discharged from the pressure relief port 210. After mixing with the outside air, they are easily ignited by high temperature, increasing the risk of fire and combustion.

[0110] By setting the average distance d1 between two adjacent mesh wires 310 between 2μm and 5μm, it is possible to ensure that the gas can be smoothly discharged through the gas channel, and to effectively intercept solid particles in the discharged gas, thereby improving the gas-solid separation efficiency and reducing the risk of fire caused by solid particles after they are ejected.

[0111] In some embodiments, the shape of the mesh 310 may include at least one of straight, curved, or polygonal shapes. This embodiment does not limit this.

[0112] Among them, the straight mesh wires 310 extend along a fixed direction, and adjacent mesh wires 310 can intersect to form a uniform mesh structure with a stable mesh gap distribution, providing a smooth path for gas flow. Curved mesh wires 310, such as arcs or waves, change the local flow field through their continuous bending shape. When gas carrying solid particles flows through the curved mesh wires 310, the airflow will circulate around the curved contour of the mesh wires 310, making it easier for the gas to collide or entangle with the surface of the mesh wires 310. The abrupt structure formed by the bends in the zigzag type helps to increase the contact opportunities between particles and the mesh wires 310.

[0113] By setting diverse shapes for the mesh 310, the probability of intercepting solid particles of different sizes and trajectories can be increased while ensuring smooth gas passage, thus enhancing the gas-solid separation effect.

[0114] In some of these embodiments, such asFigure 6 Along the thickness direction of the separator 400, the mesh screen layer 300 may include multiple layers, and the extension directions of two adjacent mesh screen layer 300 may be arranged in a cross pattern.

[0115] It is understandable that "cross arrangement" means that in the multi-layer mesh 310 layered component arranged along the thickness direction of the separator 400, the extension direction of the screen surface of the adjacent two layers or the main arrangement direction of the mesh 310 form a certain angle, rather than extending in parallel or in the same direction.

[0116] By setting up multi-layer mesh screens 300 with adjacent layers extending in a cross direction, it helps to construct a three-dimensional, interwoven interception structure through directional differences, thereby reducing blind spots in the interception. While ensuring gas flow, it improves the overall blocking effect on solid particles and enhances the safety performance of the battery cell 1100 during pressure relief.

[0117] In some of these embodiments, such as Figure 4 The screen layer 300, when projected onto the top cover 200, completely covers the pressure relief port 210. "Completely covers" means that when a vertical projection is made from the plane of the top cover 200 onto the screen layer 300, the projected area of ​​the screen layer 300 completely encloses the entire area of ​​the pressure relief port 210. This entire area includes the edges and the entire interior of the pressure relief port 210.

[0118] By setting the mesh screen layer 300 to completely cover the pressure relief port 210 in the orthogonal projection of the top cover 200, it can be ensured that the gas and solid particles in it flowing from the inside of the housing 100 through the pressure relief channel to the pressure relief port 210 must pass through the mesh screen layer 300, reducing the amount of unintercepted solid particles that are directly discharged from the pressure relief port 210, thereby maximizing the separation effect.

[0119] In some of these embodiments, such as Figure 4 and Figure 5 The isolation member 400 may be provided with a through pressure relief channel 450 along its thickness direction. The pressure relief channel 450 connects the inside of the housing 100 with the pressure relief port 210. The screen layer member 300 is disposed in the pressure relief channel 450.

[0120] It should be noted that the shape and size of the pressure relief channel 450 are not limited. The pressure relief channel 450 can be circular, square, polygonal, etc., depending on actual design requirements. This embodiment does not impose any limitations in this regard.

[0121] By setting up the pressure relief channel 450, the gas and solid particles discharged from the housing 100 can be concentrated through the pressure relief channel 450, which helps to ensure that the interception component can effectively intercept them.

[0122] In some of these embodiments, such as Figure 4 and Figure 5 The isolation member 400 may include an isolation body 410 and a fixing structure 420; the fixing structure 420 protrudes from at least a portion of the isolation body 410 toward the opening and is disposed around the inner edge of the pressure relief channel 450, and the screen layer 300 is connected to the fixing structure 420; the fixing structure 420 and the isolation body 410 together define a bending space 430 for accommodating the tab.

[0123] By setting a fixed structure 420 and surrounding the inner edge of the pressure relief channel 450, the pressure relief channel 450 can also be structurally strengthened, reducing the impact damage to the isolation body 410 when high-temperature and high-pressure gas passes through the pressure relief channel 450. In addition, the design of the bending space 430 can constrain the layout of the electrode tabs, making the internal structure of the battery cell 1100 more compact and orderly, improving space utilization, and thus enhancing the safety performance and reliability of the battery cell 1100.

[0124] It should be noted that the screen layer component 300 and the fixing structure 420 can be connected by welding, screw connection or snap-fit, and this embodiment does not limit this.

[0125] In some of these embodiments, such as Figure 5 The vertical distance between the end face of the fixed structure 420 and the isolation body 410 can be d2, and d2 can satisfy the condition: 3mm≤d2≤9mm.

[0126] In some embodiments, d2 can be set to 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or any value between 3mm and 9mm, depending on actual needs.

[0127] If d2 is less than 3mm, the bending space 430 formed between the fixed structure 420 and the isolation body 410 is not high enough, and the bent part of the electrode tab cannot be fully accommodated. This may cause the electrode tab to exceed the space range after bending, and it may be easily squeezed and rubbed with the isolation body 410 or other structures in the pressure relief channel 450, thereby causing damage or displacement of the electrode tab, affecting the connection stability with the top cover 200, and even causing poor contact due to electrode tab deformation, resulting in a decrease in conductivity.

[0128] If d2 is greater than 9mm, the bending space 430 will be too high, occupying too much space inside the battery cell 1100, resulting in a decrease in the structural compactness of the battery cell 1100 and a reduction in space utilization. Furthermore, an excessively tall fixing structure 420 may obstruct gas flow within the pressure relief channel 450, affecting the smooth discharge of high-temperature, high-pressure gas and reducing pressure relief efficiency. Moreover, a larger space may cause unnecessary shaking of the tabs within, which is detrimental to the stable placement of the tabs and makes it difficult to ensure the reliability of their connection.

[0129] Therefore, by setting d2 within the range of 3mm to 9mm, sufficient and appropriate space can be provided for the bending part of the tab, ensuring the assembly stability of the tab, avoiding adverse contact with other structures, and ensuring conductivity and safety; at the same time, it will not occupy excessive internal space, maintain the structural compactness of the battery cell 1100, and ensure the normal function of the pressure relief channel 450.

[0130] In some embodiments, the surface of the screen layer 300 may be coated with an insulating coating.

[0131] The mesh screen layer 300 can be made of ceramic material; or it can be made of high-temperature resistant resin-based composite material. This embodiment does not limit this. By coating the surface of the mesh screen layer 300 with an insulating coating, the insulation performance can be maintained in the high-temperature environment of thermal runaway of the battery cell 1100, reducing the risk of short circuit.

[0132] In some of these embodiments, such as Figure 4 and Figure 5 Along the length of the isolation member 400, at least one end of the isolation member 400 extends to have an exhaust end 440, which protrudes toward the opening side and may have multiple exhaust holes 441.

[0133] By providing the exhaust end 440, the gas inside the housing 100 can be guided to converge towards the opening. The multiple exhaust holes 441 provide multiple paths for gas discharge, effectively reducing local gas accumulation inside the housing 100. At the same time, the distribution of the exhaust holes 441 can disperse the impact force when the gas is discharged. It is understandable that the exhaust end 440 is located on the side of the isolation member 400, which facilitates the passage of side gas in the event of thermal runaway.

[0134] The battery cell 1100 provided in this embodiment includes a housing 100 and a top cover 200. The top cover 200 is connected to the opening of the housing 100 and has a pressure relief port 210. An isolator 400 is located on the side of the top cover 200 near the opening. A mesh screen layer 300 is disposed on the isolator 400 and opposite to the pressure relief port 210. In the direction parallel to the top cover 200, the sieve surface of the mesh screen layer 300 is inclined relative to this direction and is configured to block solid particles in the discharged gas. The inclination angle of the sieve surface extension direction of the mesh screen layer 300 relative to the cross section is A, which satisfies the condition: 5°≤A≤15°. The average spacing between two adjacent mesh wires 310 is d1, which satisfies the condition: 2μm≤d1≤5μm.

[0135] During the manufacturing process of the battery cell 1100 provided in this application embodiment, the isolation component 400 serves to isolate the internal electrode assembly of the housing 100 from the top cover 200, reducing the risk of short circuits and corrosion caused by direct contact between the electrode assembly and the metal parts of the top cover 200. Simultaneously, it provides stable support for the screen layer component 300. The screen layer component 300 is inclined relative to the direction parallel to the top cover 200. When the battery cell 1100 experiences thermal runaway, the high-speed ejected gas carries solid particles that impact the screen. The inclined screen surface generates oblique resistance to the solid particles, ensuring smooth gas discharge while guiding the movement trajectory of the solid particles through angle. This makes it easier for the solid particles to be intercepted on the screen surface, improving interception efficiency and reducing the risk of them directly passing through the mesh and exiting through the pressure relief port 210. This further reduces the risk of fire caused by the solid particles mixing with the gas after ejection, ensuring the safety of the pressure relief process and improving the safety performance of the battery device. By setting the tilt angle A of the screen surface relative to the cross-section between 5° and 15°, the solid particles are more likely to collide with and be intercepted by the screen surface, taking into account their movement trajectory. Furthermore, the moderate tilt angle avoids excessively increasing the resistance to gas flow, reducing pressure buildup inside the shell 100. By setting the average distance d1 between two adjacent mesh wires 310 between 2μm and 5μm, the gas can be smoothly discharged through the gas flow channel while effectively intercepting solid particles in the discharged gas, improving gas-solid separation efficiency and reducing the risk of fire caused by ejected solid particles.

[0136] Please see Figure 2 This application also provides a battery device, including a housing 1200 and a battery cell 1100, wherein the battery cell 1100 is housed within the housing 1200.

[0137] When the battery cell 1100 provided in this embodiment is used, the isolation component 400 can isolate the electrode assembly inside the housing 100 from the top cover 200, reducing the risk of short circuits and corrosion caused by direct contact between the electrode assembly and the metal parts of the top cover 200; at the same time, it can provide stable support for the screen layer component 300. The screen layer component 300 is inclined relative to the direction parallel to the top cover 200. When the battery cell 1100 experiences thermal runaway, the high-speed ejected gas carries solid particles and impacts the screen. The inclined screen surface generates oblique resistance to the solid particles, thereby ensuring smooth gas discharge while guiding and changing the trajectory of the solid particles through angle, making it easier for the solid particles to be intercepted on the screen surface, improving interception efficiency, reducing the risk of direct discharge through the mesh and from the pressure relief port 210, and thus reducing the risk of fire caused by the solid particles mixing with the gas after being ejected, ensuring the safety of the pressure relief process and improving the safety performance of the battery device.

[0138] Please see Figure 1 This application provides an electrical device, including a battery device from any of the above embodiments, which is used to provide electrical energy to the electrical device.

[0139] When the electrical device provided in this application embodiment is in use, the battery device composed of the battery cell 1100 provided in this application embodiment provides electrical energy to the electrical device. By setting the isolation component 400, it can isolate the internal electrode assembly of the housing 100 from the top cover 200, reducing the risk of short circuits, corrosion, etc. caused by direct contact between the metal parts of the electrode assembly and the top cover 200; at the same time, it can provide stable support for the screen layer component 300. By setting the screen layer component 300, its extension direction is inclined relative to the direction parallel to the top cover 200. When the battery cell 1100 thermally runs away, the high-speed ejected gas carries solid particles and impacts the screen. The inclined screen surface will generate oblique resistance to the solid particles, thereby ensuring the smooth discharge of gas while guiding and changing the movement trajectory of the solid particles by angle, making it easier for the solid particles to be intercepted on the screen surface, improving the interception efficiency, reducing the risk of directly passing through the mesh and being discharged from the pressure relief port 210, and thus reducing the risk of solid particles mixing with gas and causing fire and combustion, ensuring the safety of the pressure relief process, and improving the safety performance of the battery device.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 cell, characterized in that, include: The housing (100) has an opening at at least one end; A top cover (200) is connected to the opening, and the top cover (200) is configured with a pressure relief port (210). An explosion-proof valve (140) is provided at the pressure relief port (210); The mesh screen layer (300), located on the side of the explosion-proof valve (140) near the housing (100) and opposite the pressure relief port (210), is configured to allow gas in the housing (100) to pass through and be discharged from the pressure relief port (210); Wherein, in a direction parallel to the top cover (200), the screen surface extension direction of the screen layer (300) is inclined relative to this direction.

2. The battery cell according to claim 1, characterized in that, The inclination angle of the screen surface extension direction of the screen layer component (300) is A, and A satisfies the following condition: 5°≤A≤15°。 3. The battery cell according to claim 1, characterized in that, The mesh screen layer (300) includes a plurality of interconnected mesh wires (310).

4. The battery cell according to claim 3, characterized in that, The average spacing between two adjacent mesh wires (310) is d1, and d1 satisfies the following condition: 2μm≤d1≤5μm.

5. The battery cell according to claim 3, characterized in that, The shape of the wire (310) includes at least one of straight, curved or zigzag.

6. The battery cell according to any one of claims 1-5, characterized in that, Along the thickness direction of the top cover (200), the mesh screen layer (300) comprises multiple layers, and the extension directions of adjacent mesh screen layer (300) are arranged in a cross pattern.

7. The battery cell according to any one of claims 1-5, characterized in that, The mesh layer (300) completely covers the pressure relief port (210) in the orthographic projection of the top cover (200).

8. The battery cell according to any one of claims 1-5, characterized in that, It also includes an isolation element (400) located on the side of the top cover (200) near the opening and connected to the top cover (200); the screen layering element (300) is disposed on the top cover (200).

9. The battery cell according to claim 8, characterized in that, The isolation member (400) is provided with a through pressure relief channel (450) along its thickness direction. The pressure relief channel (450) connects the interior of the housing (100) with the pressure relief port (210). The screen layer member (300) is disposed in the pressure relief channel (450).

10. The battery cell according to claim 9, characterized in that, The isolation element (400) includes an isolation body (410) and a fixing structure (420); The fixing structure (420) protrudes from at least a portion of the isolation body (410) toward the opening and is disposed around the inner edge of the pressure relief channel (450); the screen layer (300) is connected to the fixing structure (420). The fixed structure (420) and the isolation body (410) together define a bending space (430) for accommodating the tab.

11. The battery cell according to claim 10, characterized in that, The vertical distance between the end face of the fixed structure (420) and the isolation body (410) is d2, and d2 satisfies the following condition: 3mm≤d2≤9mm.

12. The battery cell according to claim 8, characterized in that, Along the length extension direction of the isolation member (400), at least one end of the isolation member (400) extends to have an exhaust end (440), the exhaust end (440) protrudes toward the opening side, and the exhaust end (440) has a plurality of exhaust holes (441).

13. The battery cell according to any one of claims 1-5, characterized in that, The surface of the mesh screen layer (300) is coated with an insulating coating.

14. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery device of claim 14, the battery device being used to provide electrical energy.

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