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 intercepting assembly is located on the side, close to the shell, of the anti-explosion valve and is opposite to the pressure relief opening; wherein the intercepting assembly comprises a plurality of intercepting structures which are arranged at intervals, a gas flow channel for gas to pass through is formed between a part of adjacent two intercepting structures, and the side, facing the opening, of each intercepting structure is provided with an intercepting face used for intercepting solid-liquid substances. According to the invention, gas is ensured to be discharged smoothly, solid-liquid substances are intercepted efficiently, the gas-solid separation efficiency is improved, the safety of the pressure relief process is ensured, and the safety performance of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Under conditions such as short circuits or overcharging, battery devices may generate a certain amount of high-temperature, high-pressure gas. 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. These solid particles, when ejected with the gas and mixed with the air, easily create a fire hazard, resulting in relatively low safety performance of the battery device. Utility Model Content

[0003] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that ensures the smooth discharge of gas while achieving efficient interception of solid and liquid substances, improving gas-solid separation efficiency, ensuring the safety of the pressure relief process, and enhancing the safety performance of the battery device.

[0004] In a first aspect, this application provides a battery cell, comprising: a housing having an opening at at least one end; a top cover connected to the opening, the top cover having a pressure relief port; an explosion-proof valve disposed at the pressure relief port; and an interception assembly located on the side of the explosion-proof valve near the housing and opposite to the pressure relief port; wherein the interception assembly comprises a plurality of spaced-apart interception structures, a gas flow channel for gas passage is formed between a portion of adjacent interception structures, and each interception structure has an interception surface on the side facing the opening, the interception surface being used to intercept solid and liquid substances.

[0005] In the technical solution of this application embodiment, an interception component is provided, including multiple interception structures arranged at intervals. When a battery cell experiences thermal runaway, the high-speed ejected gas carries solid particles and impacts the interception structures. The interception structures have a large interception area, thereby ensuring the smooth discharge of gas while altering the trajectory of solid and liquid substances, causing them to be intercepted and returned to the casing. This improves interception efficiency, reduces the risk of direct discharge from the pressure relief port, and further reduces the risk of fire caused by solid particles mixing with gas after being ejected, ensuring the safety of the pressure relief process and improving the safety performance of the battery device.

[0006] In some embodiments, a number of adjacent interception structures have overlapping areas.

[0007] By setting a certain number of adjacent interception structures with overlapping areas, the effective channel cross-section of the gas flow channel can be further reduced, enhancing the interception effect on solid and liquid substances and reducing the risk of them being discharged from the pressure relief port.

[0008] In some embodiments, multiple interception structures are arranged in an array.

[0009] By setting up an array arrangement, regular and evenly distributed gas flow channels can be formed, ensuring smooth gas discharge while achieving efficient and stable interception of solid and liquid substances, thus improving gas-solid separation efficiency.

[0010] In some embodiments, the distance between the center lines of any two adjacent interception structures is d1, and d1 satisfies the condition: 2μm≤d1≤10μm.

[0011] By setting the average distance d1 between the centers of any two adjacent interception structures between 2μm and 10μm, it is possible to ensure that the gas can be smoothly discharged through the gas flow channel, while effectively intercepting solid and liquid substances 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 cross-sectional shape of the interception structure in a plane parallel to the top cover includes at least one of a disc shape, a triangle, a square shape, or a rhombus shape.

[0013] By limiting the shape of the interception structure to be diverse, the probability of intercepting solid and liquid substances of different sizes and trajectories can be increased while ensuring the smooth passage of gas, thereby enhancing the gas-solid separation effect.

[0014] In some embodiments, along the thickness direction of the top cover, the interception assembly includes at least a first layer of interceptors and a second layer of interceptors;

[0015] The second layer of interceptor is connected to the side of the first layer of interceptor facing the pressure relief port, and the orthographic projection of the second layer of interceptor on the top cover partially overlaps with the orthographic projection of the first layer of interceptor on the top cover.

[0016] By including a first layer of interceptors and a second layer of interceptors, a multi-stage interception structure is formed, which can achieve multiple interceptions by changing the movement trajectory of solid and liquid substances, thereby further improving the interception efficiency of solid and liquid substances. At the same time, it ensures that the gas can be smoothly discharged through the flow channel of the non-overlapping area, thus enhancing the gas-solid separation effect.

[0017] In some embodiments, the interception component covers a portion of the pressure relief port in the orthographic projection of the top cover.

[0018] By setting the interception component to cover the pressure relief port in the orthogonal projection of the top cover, it can be ensured that the gas flowing from the inside of the shell through the pressure relief channel to the pressure relief port can be smoothly discharged from the pressure relief port that is not covered by the interception component. The solid and liquid substances in the gas must be intercepted by the area covered by the interception component, reducing the direct discharge of unintercepted solid and liquid substances from the pressure relief port, thereby maximizing the interception effect.

[0019] In some embodiments, the interception structure is an insulating element.

[0020] By setting up an interception structure made of insulating material, the structure can maintain stability when the battery cell experiences thermal runaway and generates high temperatures, reducing the risk of losing the interception function due to high temperature damage. At the same time, it helps prevent the interception component from forming a conductive path with other metal parts, which could lead to a short circuit.

[0021] In some embodiments, the battery cell further includes a separator located on the side of the top cover near the opening and connected to the top cover; the interception assembly is disposed on the separator.

[0022] By setting up an isolator, 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 interception assembly.

[0023] In some embodiments, the isolator 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 interception group is disposed in the pressure relief channel.

[0024] By setting up a pressure relief channel, the gas and solid-liquid substances 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.

[0025] In some embodiments, the battery cell further includes a support frame disposed on the pressure relief channel, and the interception component is disposed on the support frame.

[0026] By installing a support frame inside the pressure relief channel, stable support can be provided for the interception component, reducing the impact of displacement or deformation of the interception component due to force on the interception effect, ensuring its continuous and efficient interception of solid and liquid substances, and improving the safety performance of the battery cell.

[0027] In some embodiments, the interception component is welded to the support frame.

[0028] By welding the interception components to the support frame, the stability of the connection between the two is enhanced, making the interception components less likely to fall off or shift under the impact of high temperature and high pressure gas. This ensures the integrity of the interception structure and the continuity of the interception function, thereby stably and efficiently intercepting solid and liquid substances, improving the gas-solid separation effect and the safety performance of the battery cells.

[0029] In some embodiments, the support frame includes at least a first layer of support and a second layer of support, wherein the first layer of support includes a plurality of first support rods extending along a first direction;

[0030] The second layer of support is connected to the side of the first layer of support facing the top cover, and the second layer of support includes a plurality of second support rods extending along a second direction; the first direction intersects the second direction.

[0031] By including a first-layer support and a second-layer support, a cross-support structure can be formed, which not only provides more stable support for the interception component and enhances its structural stability under the impact of high-temperature and high-pressure gas, but also optimizes the gas flow path in the pressure relief channel through the cross-arranged support rods. While ensuring the smooth passage of gas, it helps the interception component to improve the interception effect on solid and liquid substances, and further improves the safety performance of the battery cell.

[0032] In some embodiments, the surface of the support frame is coated with an insulating coating.

[0033] By coating the surface of the support frame with an insulating coating, the insulation performance can be maintained in the high-temperature environment of thermal runaway of the battery cell, reducing the risk of short circuit caused by the formation of a conductive path between the support frame and the interception component or other components. At the same time, the high-temperature resistance of the support frame can be enhanced to maintain structural stability and ensure effective support for the interception component.

[0034] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0035] When the battery device provided in this application embodiment is in use, an interception component is provided, including multiple interception structures arranged at intervals. When a single battery cell experiences thermal runaway, the high-speed ejected gas carries solid particles that impact the interception structures. The interception structures have a large interception area, thereby ensuring the smooth discharge of gas while altering the trajectory of solid and liquid substances, causing them to be intercepted and returned to the casing. This improves interception efficiency, reduces the risk of direct discharge from the pressure relief port, and further reduces the risk of solid particles mixing with gas and igniting, ensuring the safety of the pressure relief process and improving the safety performance of the battery device.

[0036] 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.

[0037] 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. An interception component is provided, including multiple interception structures arranged at intervals. When a battery cell experiences thermal runaway, the high-speed ejected gas, carrying solid particles, impacts the interception structures. The interception structures have a large interception area, thereby ensuring the smooth discharge of gas while altering the trajectory of solid and liquid substances, causing them to be intercepted and returned to the casing. This improves interception efficiency, reduces the risk of direct discharge from the pressure relief port, and further reduces the risk of fire caused by the mixture of ejected solid particles and gas, ensuring the safety of the pressure relief process and improving the safety performance of the battery device.

[0038] 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

[0039] 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:

[0040] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle.

[0041] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0042] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0043] Figure 4 This is a schematic diagram of the structure of the separator of a battery cell provided in some embodiments of this application.

[0044] Figure 5 This is a schematic diagram of the support frame and interception assembly provided in some embodiments of this application.

[0045] Figure 6 This is a schematic diagram of the structure of a first-layer interceptor provided in some embodiments of this application.

[0046] Figure 7 The diagram shows the structure of the first-layer interceptor and the second-layer interceptor provided in some embodiments of this application.

[0047] The reference numerals in the detailed embodiments are as follows:

[0048] 10000 - Vehicles;

[0049] 1000-battery;

[0050] 1100-cell battery;

[0051] 110 - Through hole; 120 - Positive terminal; 130 - Negative terminal; 140 - Explosion-proof valve; 150 - Protective patch; 160 - Sealing ring;

[0052] 200 - Top cover; 210 - Pressure relief port;

[0053] 300 - Interception component; 310 - First-layer interceptor; 311 - First-layer interceptor structure; 320 - Second-layer interceptor; 321 - Second-layer interceptor structure; 330 - Gas flow channel;

[0054] 400 - Isolation component; 410 - Isolation body; 420 - Fixing structure; 430 - Bending space; 440 - Exhaust end; 441 - Exhaust port; 450 - Pressure relief channel;

[0055] 500 - Support frame; 510 - First layer support; 511 - First support rod; 520 - Second layer support; 521 - Second support rod;

[0056] 1200 - Box body; 1210 - Storage space; 1220 - First section; 1230 - Second section;

[0057] 2000-Controller;

[0058] 3000-motor. Detailed Implementation

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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).

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] Based on the above considerations, in order to achieve efficient interception of solid and liquid substances while ensuring smooth gas discharge, this application provides a battery cell with an interception assembly including multiple spaced-apart interception structures. When the battery cell experiences thermal runaway, the high-speed ejected gas carries solid particles that impact the interception structures. These structures have a large interception area, thus ensuring smooth gas discharge while altering the trajectory of the solid and liquid substances, causing them to be intercepted and returned to the casing. This improves interception efficiency, reduces the risk of direct discharge from the pressure relief port, and further reduces the risk of fire caused by 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.

[0070] 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.

[0071] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0072] Please see Figure 1 , Figure 1 The diagram shows the structure of a vehicle provided in some embodiments of this application.

[0073] 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.

[0074] 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.

[0075] Please see Figure 2 , Figure 2 Exploded views of batteries provided for some embodiments of this application.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] A battery cell 1100 refers to the smallest unit that makes up a battery 1000. A battery cell 1100 includes a casing, a top cover 200, a cell assembly, and other functional components.

[0080] The top cover 200 refers to a component that closes onto the opening of the housing 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 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, giving the battery cell 1100 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 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 also 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 from the top cover 200 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0081] The housing 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 be used to accommodate the cell assembly, electrolyte, and other components. The housing and the top cover 200 can be independent components. An opening can be provided on the housing, 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 can be integrated. Specifically, the top cover 200 and the housing 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, the top cover 200 closes onto the housing. The housing can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the cell assembly. The housing 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.

[0082] A cell assembly is the component within a single battery cell 1100 where an electrochemical reaction occurs. The casing 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.

[0083] The following is a detailed description of the structure of a single battery cell. Please refer to [link / reference needed]. Figures 3-7 , Figure 3 The diagram shows an exploded structural diagram of a battery cell provided in some embodiments. Figure 4 The diagram shows a schematic representation of the structure of the separator for a battery cell provided in some embodiments. Figure 5 The diagram shows structural schematics of the support frame and interception components provided in some embodiments. Figure 6 The diagram shows a schematic representation of the structure of the first-layer interceptor provided in some embodiments. Figure 7 The diagram shows structural schematics of a first-layer interceptor and a second-layer interceptor provided in some embodiments.

[0084] Please see Figure 3 and Figure 4 This application provides a battery cell 1100. In this embodiment, the battery cell 1100 is mainly described as a prismatic battery.

[0085] like Figure 3The battery cell 1100 includes a housing, a top cover 200 and an explosion-proof valve 140. At least one end of the housing 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.

[0086] It should be noted that the battery cell 1100 provided in this embodiment adopts a split structure design, consisting of a shell and a top cover 200. The shell and top cover 200 are tightly connected, forming a closed cavity to accommodate components such as the battery cell assembly. The shell and 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.

[0087] like Figure 3 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 1000 reaches a threshold, the explosion-proof valve 140 opens, allowing the pressure relief port 210 to connect the inside and outside, thus releasing pressure.

[0088] 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. The top cover 200 and the separator 400 each have through holes 110 facing the positive terminal 120 and the negative terminal 130, respectively, 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, on which a sealing ring 160 is fitted to facilitate the installation of the positive terminal 120 and the negative terminal 130.

[0089] 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 isolate the internal electrode assembly 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 interception assembly.

[0090] To ensure the smooth discharge of gas while achieving efficient interception of solid and liquid substances, in some embodiments, such as Figure 3 and Figure 4The battery cell 1100 includes an interception assembly 300 located on the side of the explosion-proof valve 140 near the housing and opposite the pressure relief port 210. The interception assembly 300 includes multiple interception structures arranged at intervals. A gas flow channel 330 for gas to pass through is formed between a number of adjacent interception structures. Each interception structure has an interception surface on the side facing the opening, which is used to intercept solid and liquid substances.

[0091] It should be noted that "solid-liquid substances" refers to all non-gaseous substances that occur during thermal runaway of the battery cell 1100. Their forms and compositions include, but are not limited to: individual solid particles, such as fragments of electrode active material; individual liquid substances, such as molten metal beads of aluminum, copper, etc.; or mixtures of solid and liquid, such as electrode material encased in molten metal. The interception surface of the interception component 300 can effectively intercept all of the above-mentioned substances. This embodiment does not limit this.

[0092] The location of the interception component 300 is not limited. The interception component 300 can be set on the top cover 200, or between the top cover 200 and the isolator 400; or the interception component 300 can be set on the isolator 400.

[0093] In this embodiment, the interception component 300 is mainly described using the example of the isolation member 400. The isolation member 400 provides stable support for the interception component 300; moreover, since the isolation member 400 is located between the housing and the top cover 200, fixing the interception 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.

[0094] The connection method between the interception component 300 and the isolator 400 is not limited and can be installed according to actual needs. Furthermore, since the interception component 300 is opposite the pressure relief port 210, it can be understood that the centerline of the interception component 300 and the centerline of the pressure relief port 210 can coincide or be parallel to ensure that the airflow direction is perpendicular to the interception surface, maximizing interception efficiency.

[0095] There are no restrictions on the shape, number, or size of the interception structure; it can be set according to actual needs. Furthermore, the interception surface of the structure faces the opening side, which can be understood as facing the direction of gas ejection, thereby capturing solid and liquid substances through collision, adsorption, or other methods.

[0096] Thus, when the internal pressure of the battery cell 1100 increases and triggers the opening of the explosion-proof valve 140, the high-pressure gas and the carried solid and liquid substances will be ejected at high speed through the pressure relief port 210. The gas is ejected axially along the pressure relief port 210 and impacts the interception surface of the interception component 300. The gas flow channel 330 between adjacent interception structures allows the gas to pass through, but the tortuous or narrow design of the flow channel will reduce the gas flow velocity and promote particulate matter sedimentation. Among them, large solid particles cannot be well oriented with the airflow due to inertia. After impacting the interception surface, they fall into the shell under the action of gravity. Small particles adhere to the surface of the interception structure due to electrostatic or van der Waals forces.

[0097] 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.

[0098] Therefore, in the technical solution of this application embodiment, an interception component 300 is provided, including multiple interception structures arranged at intervals. When the battery cell 1100 experiences thermal runaway, the high-speed ejected gas carries solid particles and impacts the interception structure. The interception structure has a large interception area, thereby ensuring the smooth discharge of gas while altering the trajectory of the solid and liquid substances, causing them to be intercepted and returned to the casing, improving interception efficiency, reducing the risk of direct discharge from the pressure relief port 210, and further 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.

[0099] In some of these embodiments, such as Figure 4 A number of adjacent interception structures may have overlapping areas.

[0100] It should be noted that the "overlapping area" can include axial overlap and radial overlap. Axial overlap is characterized by the edge of the later intercepting structure covering part of the area of ​​the previous intercepting structure along the gas flow direction, and the projections of the two overlap. Radial overlap is characterized by the edge areas of adjacent intercepting structures partially overlapping in the direction parallel to the top cover 200.

[0101] The number of interception structures with overlapping areas is not limited and can be set according to actual needs. By setting a certain number of adjacent interception structures with overlapping areas, the effective channel cross-section of the gas flow channel 330 can be further reduced, enhancing the interception effect on solid and liquid substances and reducing the risk of them being discharged from the pressure relief port 210.

[0102] In some of these embodiments, such as Figure 5 Multiple interception structures can be arranged in an array.

[0103] It should be noted that the multiple interception structures can be arranged in a grid pattern on the surface of the isolator 400, forming a regular longitudinal and transverse distribution pattern; or, the spacing between the interception structures in different areas of the array can be differentiated according to actual needs. This embodiment does not limit this.

[0104] By setting up an array arrangement, regular and evenly distributed gas flow channels 330 can be formed, which can ensure smooth gas discharge while achieving efficient and stable interception of solid and liquid substances, thereby improving gas-solid separation efficiency.

[0105] In some of these embodiments, such as Figure 6 The distance between the centers of any two adjacent interceptor structures can be d1, and d1 can satisfy the condition: 2μm≤d1≤10μm.

[0106] It should be noted that for multiple interception structures arranged in a rectangular or other spaced pattern, the distance d1 can be measured as follows: select any two adjacent interception structures, determine their respective geometric center points, and measure the straight-line distance between these two center points.

[0107] In some embodiments, d1 can be set to 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm or any value between 2μm and 10μm, depending on actual needs.

[0108] If d1 is less than 2μm, the spacing between adjacent interception structures is too small, resulting in an excessively small cross-sectional size of the gas flow channel 330. In this case, the resistance encountered by the gas generated by thermal runaway when passing through the flow channel increases significantly, which may prevent it from being discharged smoothly from the inside of the casing. This leads to a continuous increase in internal pressure, posing a risk of cell explosion due to excessive pressure. At the same time, the excessively small spacing may also make the interception structures prone to blockage by solid and liquid substances, further hindering gas discharge, affecting the pressure relief effect, and ultimately reducing the safety performance of the 1100 battery cell.

[0109] If d1 is greater than 10μm, the spacing between adjacent interception structures is too large, resulting in a large cross-sectional size of the gas flow channel 330. Although the gas can be discharged smoothly, the interception effect of the interception structure on solid and liquid substances will be significantly weakened, and a large amount of solid and liquid substances will be discharged from the pressure relief port 210 along with the gas through the flow channel. After these discharged solid and liquid substances mix with the outside air, they are very likely to ignite and burn, making effective gas-solid separation impossible and increasing the safety risk of the battery cell 1100 during thermal runaway.

[0110] Therefore, by setting the distance d1 between the center lines of any two adjacent interception structures between 2μm and 10μm, it is possible to ensure that the gas can be smoothly discharged through the gas flow channel 330, and to effectively intercept solid and liquid substances 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 cross-sectional shape of the interception structure in a plane parallel to the top cover 200 may include at least one of a disc shape, a triangle, a square, or a rhombus. Different shapes of interception structures can form diverse interception surfaces and gas flow channels 330. For example, a disc-shaped structure with smooth edges can reduce resistance when gas passes through; polygonal structures such as triangles, squares, and rhombuses can create more complex flow fields through their corners, altering the trajectory of solid and liquid substances.

[0112] In the embodiments of this application, such as Figure 5 The example mainly uses a disc-shaped interception structure. The interception component 300 is a disassembled structure composed of multiple discs. The total area of ​​the discs can be greater than the area of ​​the explosion-proof valve 140. In this way, under abnormal conditions such as thermal runaway of the battery cell, the probability of solid particles passing upward can be reduced, while the efficiency of gas passage is not reduced, thus improving the efficiency of spark ignition of smoke.

[0113] By diversifying the shapes of the interception structures, the probability of intercepting solid and liquid substances of different sizes and trajectories can be increased while ensuring the smooth passage of gas, thereby enhancing the gas-solid separation effect.

[0114] In some embodiments, the disk structure in this application embodiment can also be designed as a dense mesh structure. This graded mesh structure can also improve the efficiency of gas passage and effectively block solid and liquid substances.

[0115] In some of these embodiments, such as Figures 5 to 7 Along the direction from the isolator 400 to the top cover 200, the interception assembly 300 may include at least a first layer of interceptors 310 and a second layer of interceptors 320. The number of interceptors is not limited; for example, it may include two, three, or more layers of interceptors.

[0116] In the embodiments of this application, such as Figure 5 and Figure 7 The following explanation will primarily focus on an example comprising a first-layer interceptor 310 and a second-layer interceptor 320. Specifically, the first-layer interceptor 310 comprises multiple spaced-apart first-layer interceptor structures 311, and the second-layer interceptor 320 comprises multiple spaced-apart second-layer interceptor structures 321.

[0117] The second layer interceptor 320 is connected to the side of the first layer interceptor 310 facing the pressure relief port 210, and the orthographic projection of the second layer interceptor 320 on the top cover 200 overlaps with the orthographic projection of the first layer interceptor 310 on the top cover 200.

[0118] The first-layer interceptor 310 serves as a primary interception structure, initially intercepting the gas and solid-liquid substances discharged from the shell. Solid-liquid substances that are not intercepted by the first layer will continue to move toward the pressure relief port 210. The second-layer interceptor 320 overlaps with the projection of the first-layer interceptor 310, enabling secondary interception.

[0119] Therefore, by including the first interceptor 310 and the second interceptor 320, a multi-stage interception structure is formed, which can achieve multiple interceptions by changing the movement trajectory of solid and liquid substances, thereby further improving the interception efficiency of solid and liquid substances. At the same time, it ensures that the gas can be smoothly discharged through the flow channel of the non-overlapping area, enhancing the gas-solid separation effect. Moreover, the top cover 200 has the functions of opening the valve to release pressure and blocking the leakage of high-temperature particles inside the shell, improving the safety performance of the battery cell 1100 under extreme conditions.

[0120] In some embodiments, the interceptor component 300's orthographic projection onto the top cover 200 covers a portion of the pressure relief port 210. It is understood that "covering a portion of the pressure relief port 210" means that when a vertical projection is made from the plane of the top cover 200 onto the interceptor component 300, the projection area of ​​the interceptor component 300 covers a portion of the pressure relief port 210.

[0121] This ensures that the gas flowing from inside the casing through the pressure relief channel to the pressure relief port 210 can be smoothly discharged from the pressure relief port 210, which is not covered by the interception component 300, and that all solid and liquid substances in the gas must be intercepted by the area covered by the interception component 300, thereby reducing the amount of unintercepted solid and liquid substances that are directly discharged from the pressure relief port 210, thus maximizing the interception effect.

[0122] In some embodiments, the interception structure can be a high-temperature resistant insulating component. It is understood that the interception structure can be made of a high-temperature resistant insulating material.

[0123] In some embodiments, the interception structure may be made of ceramic material; or, the interception structure may be made of high-temperature resistant resin-based composite material. This embodiment does not limit this.

[0124] By setting up an interception structure made of insulating material, on the one hand, the structure can maintain its stability when the battery cell 1100 experiences thermal runaway and high temperatures, reducing the risk of losing its interception function due to high temperature damage. At the same time, it helps prevent the interception structure from forming a conductive path with other metal components, thus preventing short circuits. On the other hand, it reduces the risk of thermal melting at high temperatures, effectively maintaining structural stability, thereby providing a stable exhaust path and reducing the risk of the electrode assembly potentially blocking the explosion-proof valve 140 under the action of airflow, leading to an explosion, and improving the safety performance of the battery cell 1100.

[0125] In some of these embodiments, such as Figure 3 and Figure 4 The isolation component 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 with the pressure relief port 210. The interception group is disposed in the pressure relief channel 450.

[0126] 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.

[0127] By setting up a pressure relief channel 450, the gas and solid-liquid substances discharged from inside the casing can be concentrated through the pressure relief channel 450, which helps to ensure that the interception component 300 intercepts them in a targeted manner.

[0128] In some of these embodiments, such as Figure 5 The battery cell 1100 may also include a support frame 500, which is disposed in the pressure relief channel 450, and the interception component 300 is disposed in the support frame 500.

[0129] It should be noted that the arrangement of the support frame 500 is not limited. The support frame 500 is located entirely inside the pressure relief channel 450, and its outer periphery can be connected to the inner wall of the pressure relief channel 450, for example, by welding, snap-fitting, or integral molding, to ensure that it will not shift under the impact of high-temperature and high-pressure gas. This embodiment does not limit this.

[0130] Alternatively, the interception component 300 can be placed directly on the support surface of the support frame 500 and then fixed by bolts, clips, or other connectors; or, the interception component 300 can be welded to the support frame 500. The structural form of the support frame 500 can be matched to the shape of the pressure relief channel 450 and the design of the interception component 300.

[0131] By setting a support frame 500 in the pressure relief channel 450, a stable support can be provided for the interception component 300, reducing the impact of displacement or deformation of the interception component 300 due to force on the interception effect, ensuring its continuous and efficient interception of solid and liquid substances, and improving the safety performance of the battery cell 1100.

[0132] By welding the interception component 300 to the support frame 500, the stability of the connection between the two is enhanced, making the interception component 300 less likely to fall off or shift under the impact of high temperature and high pressure gas, ensuring the integrity of the interception structure and the continuity of the interception function, thereby stably and efficiently intercepting solid and liquid substances, improving the gas-solid separation effect and the safety performance of the battery cell 1100.

[0133] In some of these embodiments, such as Figure 5 The support frame 500 may include at least a first layer support 510 and a second layer support 520. The first layer support 510 includes a plurality of first support rods 511 extending along a first direction. The second layer support 520 is connected to the side of the first layer support 510 facing the top cover 200, and the second layer support 520 includes a plurality of second support rods 521 extending along a second direction; the first direction and the second direction intersect.

[0134] The number of support frames 500 is not limited; for example, it may include two layers of support frames 500, three layers of support frames 500, or more layers of support frames 500. In this embodiment, the example mainly includes a first layer of support 510 and a second layer of support 520.

[0135] Among them, the first direction can be as follows: Figure 5 As indicated by the middle arrow 'a', the second direction can be as follows: Figure 5 As indicated by arrow b. The first direction and the second direction can intersect perpendicularly; alternatively, the first direction and the second direction can also have an angle between them. In the embodiments of this application, as... Figure 5 The explanation will mainly take the example of the first direction and the second direction intersecting perpendicularly.

[0136] By including the first layer support 510 and the second layer support 520, a cross-support structure can be formed, which not only provides more stable support for the interception component 300 and enhances its structural stability under the impact of high temperature and high pressure gas, but also optimizes the gas flow path in the pressure relief channel 450 through the cross-arranged support rods. While ensuring the smooth passage of gas, it helps the interception component 300 to improve the interception effect on solid and liquid substances, and further improves the safety performance of the battery cell 1100.

[0137] In some embodiments, the surface of the support frame 500 may be coated with a high-temperature resistant insulating coating.

[0138] The support frame 500 may be made of ceramic material; or, the support frame 500 may be made of high-temperature resistant resin-based composite material. This embodiment does not limit this.

[0139] By coating the surface of the support frame 500 with a high-temperature resistant 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 caused by the formation of a conductive path between the support frame 500 and the interception component 300 or other components. At the same time, the high-temperature resistance of the support frame 500 can be enhanced to maintain structural stability and ensure effective support for the interception component 300.

[0140] In some of these embodiments, such as Figure 4 The isolation member 400 may include an isolation body 410 and a fixing structure 420, the fixing structure 420 protruding from at least a portion of the isolation body 410 toward the opening and disposed around the inner edge of the pressure relief channel 450; the fixing structure 420 and the isolation body 410 together define a bending space 430 for accommodating the tab.

[0141] By setting up the fixing structure 420, on the one hand, the fixing structure 420 can provide a stable accommodating area for the bending space 430 of the electrode tab, reducing the positional displacement or damage of the electrode tab due to shaking or collision during the assembly or use of the battery cell 1100, and ensuring the connection stability between the electrode tab and the top cover 200; on the other hand, the fixing structure 420 is set around the inner edge of the pressure relief channel 450, which can also form a certain structural reinforcement of the pressure relief channel 450, 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 tab, making the internal structure of the battery cell 1100 more compact and orderly, improving space utilization, thereby enhancing the safety performance and reliability of the battery cell 1100.

[0142] In some of these embodiments, such as Figure 4 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.

[0143] 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.

[0144] If d2 is less than 3mm, the bending space 430 formed between the fixed structure 420 and the isolation body 410 is not tall enough, and the bent part of the electrode cannot be fully accommodated within it. This may cause the electrode to exceed the space range after bending, making it easy for it to be squeezed and rubbed against the isolation body 410 or other structures within the pressure relief channel 450, thereby causing damage or displacement of the electrode, affecting its connection stability with the top cover 200, and even causing poor contact due to electrode deformation, resulting in a decrease in conductivity. At the same time, a shallow space may also cause the electrode to be too close to structures such as the interception component 300 and the support frame 500, increasing the risk of short circuit.

[0145] If d2 is greater than 9mm, the bending space 430 will be too high, occupying too much internal space of the battery 1000, 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 their stable placement and makes it difficult to ensure the reliability of their connection.

[0146] Therefore, by setting d2 within the range of 3mm to 9mm, sufficient and suitable space 1210 can be provided for the bending part of the electrode tab, ensuring the assembly stability of the electrode 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.

[0147] In some of these embodiments, such as Figure 3 and Figure 4 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 has a plurality of exhaust holes 441.

[0148] By setting the exhaust end 440, the gas inside the housing can be guided to converge towards the opening. The exhaust port 441 provides multiple paths for gas discharge, effectively reducing local gas accumulation inside the housing. At the same time, the distribution of the exhaust ports 441 can disperse the impact force when the gas is discharged. It can be understood 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.

[0149] The battery cell 1100 provided in this embodiment includes a housing and a top cover 200. The top cover 200 is connected to the opening of the housing and has a pressure relief port 210. An isolator 400 is located on the side of the top cover 200 near the opening. An interception assembly 300 is disposed on the isolator 400 and opposite to the pressure relief port 210. Along the direction from the isolator 400 to the top cover 200, the interception assembly 300 includes at least a first interception layer 310 and a second interception layer 320. The second interception layer 320 is connected to the side of the first interception layer 310 facing the pressure relief port 210, and the orthographic projection of the second interception layer 320 on the top cover 200 partially overlaps with the orthographic projection of the first interception layer 310 on the top cover 200. Each interception layer includes multiple spaced-apart interception structures. A gas flow channel 330 is formed between a number of adjacent interception structures for gas passage. Each interception structure has an interception surface on the side facing the opening, and the interception surface is configured to intercept solid and liquid substances. Some of the adjacent interception structures have overlapping areas, and the interception structures are disc-shaped.

[0150] 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 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 interception component 300. By including the first layer of interception component 310 and the second layer of interception component 320, a multi-stage interception structure is formed, thereby enabling multiple interceptions by altering the movement trajectory of solid and liquid substances, further improving the interception efficiency of solid and liquid substances. At the same time, it ensures that gas can be smoothly discharged through the flow channels in the non-overlapping areas, enhancing the gas-solid separation effect. Each layer of the interceptor includes multiple spaced-apart interceptor structures. A number of adjacent interceptor structures form a gas flow channel 330 for gas passage. When a battery cell 1100 experiences thermal runaway, the high-speed ejected gas, carrying solid particles, impacts the interceptor structures. These structures have a large interception area, thus ensuring smooth gas discharge while altering the trajectory of solid and liquid substances, causing them to be intercepted and returned to the casing. This improves interception efficiency, reduces the risk of direct discharge from the pressure relief port 210, and further reduces the risk of solid particles mixing with the gas and igniting, ensuring the safety of the pressure relief process and improving the safety performance of the battery device. By setting a number of overlapping areas between adjacent interceptor structures, the effective cross-section of the gas flow channel 330 can be further reduced, enhancing the interception effect on solid and liquid substances and reducing the risk of them being discharged from the pressure relief port 210.

[0151] 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.

[0152] When the battery cell 1100 provided in this embodiment is used, the isolation component 400 isolates the electrode assembly inside the casing from the top cover 200, reducing the risk of short circuits and corrosion caused by direct contact between the metal parts of the electrode assembly and the top cover 200. Simultaneously, it provides stable support for the interception component 300. The interception component 300 includes multiple spaced-apart interception structures. When the battery cell 1100 experiences thermal runaway, the high-speed ejected gas carries solid particles that impact the interception structures. These structures have a large interception area, ensuring smooth gas discharge while altering the trajectory of the solid and liquid substances, causing them to be intercepted and returned to the casing. This improves interception efficiency, reduces the risk of direct discharge from the pressure relief port 210, and 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.

[0153] 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.

[0154] When the electrical device provided in this application embodiment is in use, the battery device composed of the battery cells 1100 provided in this application embodiment provides electrical energy to the electrical device. By setting the isolator 400, it can isolate the electrode assembly inside the shell 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 interception assembly 300. The interception assembly 300 includes multiple interception structures arranged at intervals. When the battery cell 1100 thermally runs away, the high-speed ejected gas carries solid and liquid substances and impacts the interception structure. The interception structure has a large interception area, thereby ensuring the smooth discharge of gas while changing the trajectory of the solid and liquid substances, causing them to be intercepted and returned to the shell, improving the interception efficiency, reducing the risk of direct discharge from the pressure relief port 210, and thus reducing the risk of fire caused by the mixture of solid particles and gas after being ejected, ensuring the safety of the pressure relief process, and improving the safety performance of the battery device.

[0155] 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 shell 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 interception assembly (300) is located on the side of the explosion-proof valve (140) near the housing and opposite the pressure relief port (210); The interception component (300) includes a plurality of interception structures arranged at intervals, and a gas flow channel (330) for gas to pass through is formed between a number of adjacent two interception structures. Each interception structure has an interception surface on the side facing the opening, and the interception surface is used to intercept solid and liquid substances. A number of adjacent interception structures have overlapping areas.

2. The battery cell according to claim 1, characterized in that, The multiple interception structures are arranged in an array.

3. The battery cell according to claim 2, characterized in that, The distance between the lines connecting any two adjacent centers of the interception structures is d1, and d1 satisfies the following condition: 2μm≤d1≤10μm.

4. The battery cell according to any one of claims 1-3, characterized in that, In a plane parallel to the top cover (200), the cross-sectional shape of the interception structure includes at least one of a disc shape, a triangle shape, a square shape, or a rhombus shape.

5. The battery cell according to any one of claims 1-3, characterized in that, Along the thickness direction of the top cover (200), the interception assembly (300) includes at least a first interception element (310) and a second interception element (320). The second layer interceptor (320) is connected to the side of the first layer interceptor (310) facing the pressure relief port (210), and the orthographic projection of the second layer interceptor (320) on the top cover (200) partially overlaps with the orthographic projection of the first layer interceptor (310) on the top cover (200).

6. The battery cell according to any one of claims 1-3, characterized in that, The interception component (300) covers the pressure relief port (210) in the orthographic projection of the top cover (200).

7. The battery cell according to any one of claims 1-3, characterized in that, The interception structure is an insulating component.

8. The battery cell according to any one of claims 1-3, characterized in that, The battery cell also includes an isolator (400), which is located on the side of the top cover (200) near the opening and is connected to the top cover (200); the interception component (300) is disposed on the isolator (400).

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

10. The battery cell according to claim 9, characterized in that, The battery cell also includes a support frame (500), which is disposed in the pressure relief channel (450), and the interception component (300) is disposed in the support frame (500).

11. The battery cell according to claim 10, characterized in that, The interception component (300) is welded to the support frame (500).

12. The battery cell according to claim 10, characterized in that, The support frame (500) includes at least a first layer support (510) and a second layer support (520), wherein the first layer support (510) includes a plurality of first support rods (511) extending along a first direction; The second layer support (520) is connected to the side of the first layer support (510) facing the top cover (200), and the second layer support (520) includes a plurality of second support rods (521) extending along a second direction; the first direction intersects the second direction.

13. The battery cell according to claim 10, characterized in that, The surface of the support frame (500) 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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