Battery cell, battery, and electrical device

Abstract

A battery cell (20), a battery (100), and an electrical device. The battery cell (20) comprises a housing (21), an electrode assembly (22), a pressure relief mechanism (23), and an insulating piece (24). The housing (21) comprises a first wall (211), and a second wall (212) connected to the first wall (211). The electrode assembly (22) is arranged in the housing (21). The second wall (212) surrounds the electrode assembly (22), and a first gap (25) is formed between the electrode assembly (22) and the second wall (212). The pressure relief mechanism (23) is arranged on the first wall (211). The insulating piece (24) is arranged between the first wall (211) and the electrode assembly (22), the insulating piece (24) is used for forming an airflow channel (26) in communication with the first gap (25), and the airflow channel (26) extends to the pressure relief mechanism (23).

Description

Battery cells, batteries and electrical equipment

[0001] Priority information

[0002] This application claims priority and benefits of patent application No. 202323226526.5 filed with the State Intellectual Property Office of China on November 27, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles. In addition to improving the performance of battery cells, safety is also a key consideration in the development of power battery technology. Therefore, improving the safety of battery cells is a pressing issue in battery technology.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can improve the safety of the battery cell.

[0007] In the first aspect, the present application provides a battery cell, which includes a shell, an electrode assembly, a pressure relief mechanism and an insulating member. The shell includes a first wall and a second wall connected to the first wall. The electrode assembly is arranged in the shell, the second wall surrounds the electrode assembly, and a first gap is formed between the electrode assembly and the second wall. The pressure relief mechanism is arranged on the first wall, and the insulating member is arranged between the first wall and the electrode assembly. The insulating member is used to form an airflow channel connected to the first gap, and the airflow channel extends to the pressure relief mechanism.

[0008] In the battery cell of the embodiment of the present application, the air flow channel formed by the insulating component connects the first gap and the pressure relief mechanism, reducing the obstruction of the insulating component to the gas flow and facilitating the flow of gas; when the battery cell fails thermally and the pressure relief mechanism is actuated, the gas can flow rapidly from the gas-producing area toward the pressure relief mechanism to be discharged from the pressure relief mechanism, reducing the risk of sealing failure of the first wall and the second wall and improving the safety of the battery cell.

[0009] In certain embodiments, the air flow channel and the first gap are directly opposite to each other in the thickness direction of the first wall.

[0010] In this way, the path of the gas flowing from the first gap to the first wall is shortened, which facilitates the gas to quickly reach the pressure relief mechanism and improves the smoothness of the gas flow.

[0011] In certain embodiments, the electrode assembly is wound into a wound structure and has an arc-shaped surface, and a first gap is formed between the arc-shaped surface and the second wall.

[0012] In this way, the arcuate surface can increase the cross-sectional area of ​​the first gap, thereby facilitating the rapid flow of gas to the pressure relief mechanism and improving the gas circulation efficiency.

[0013] In some embodiments, there are multiple electrode assemblies, which are arranged in parallel, and a first gap is formed between two arc-shaped surfaces and the second wall of adjacent electrode assemblies.

[0014] In this way, a first gap is formed between each electrode assembly and the second wall, which facilitates the rapid flow of gas to the pressure relief mechanism and improves the gas circulation efficiency; in addition, multiple electrode assemblies can increase the energy density of the battery cell.

[0015] In some embodiments, the insulating member includes a main body and a first protrusion, the main body includes a first surface and a second surface arranged opposite to each other along its thickness direction, the first surface faces the electrode assembly, the first protrusion is arranged on the first surface and abuts the electrode assembly, and the airflow channel includes a through hole formed on the first protrusion.

[0016] In this way, the first protrusion abuts against the electrode assembly, which can reduce the shaking of the electrode assembly. At the same time, the first protrusion increases the gap between the electrode assembly and the first surface, allowing gas to flow through the through hole to the pressure relief mechanism, thereby improving gas circulation efficiency.

[0017] In certain embodiments, the height of the first protrusion is 0.1 mm to 4 mm.

[0018] In this way, when the height of the first protrusion is within the above range, the weight of the insulating member can be reduced while meeting the strength requirement of the first protrusion, thereby improving the safety and practicality of the battery cell.

[0019] In certain embodiments, the first protrusion includes a bottom surface and a side surface, the bottom surface abuts against the electrode assembly, the side surface connects the first surface and the bottom surface, and the through hole passes through the side surface.

[0020] In this way, the through hole passes through two opposite side surfaces of the first protrusion, so that gas can pass through the first protrusion, thereby reducing the obstruction of the first protrusion to the gas flow and improving the smoothness of the gas flow.

[0021] In certain embodiments, the through hole extends through the bottom surface.

[0022] In this way, the through hole penetrates the bottom surface, increasing the cross-sectional area of ​​the through hole, facilitating the rapid flow of gas to the pressure relief mechanism, and improving the gas circulation efficiency; in addition, the through hole is also easier to form.

[0023] In some embodiments, the through hole passes through the side surface along the length direction of the body, the dimension of the through hole along the width direction of the body is D, the width of the body is W, and 0.1<D / W<0.9.

[0024] Thus, when D / W is within the above range, the through hole can be easily formed. In addition, the larger the ratio of the through hole's dimension along the width direction of the body to the width dimension of the body, the larger the through hole's dimension relative to the body, facilitating rapid gas flow to the pressure relief mechanism and improving gas flow efficiency.

[0025] In certain embodiments, the air flow channel includes a through hole formed in the body, the through hole passing through the first surface and the second surface, the through hole being opposite to the pressure relief mechanism along the thickness direction of the body, and the through hole being connected to the through hole.

[0026] In this way, the gas can flow from the first gap through the perforation to the pressure relief mechanism, thereby increasing the number of gas flow paths and improving the gas circulation efficiency.

[0027] In some embodiments, the air flow channel includes a mounting hole formed in the body, the mounting hole passes through the first surface and the second surface, the first protrusion is arranged at an edge of the mounting hole, and the mounting hole is used to lead out electrical energy of the battery cell.

[0028] In this way, the electrode assembly can charge and discharge the battery cell through the mounting hole. In addition, the gas can also flow to the pressure relief mechanism through the mounting hole, which increases the number of gas flow paths and improves the gas circulation efficiency.

[0029] In certain embodiments, a second gap is formed between the second surface and the first wall, and the air flow channel includes the second gap.

[0030] In this way, the size of the second gap is larger, and the gas can flow to the pressure relief mechanism through the second gap, which facilitates the gas to flow to the pressure relief mechanism quickly and improves the gas circulation efficiency.

[0031] In some embodiments, the insulating member includes a plurality of second protrusions arranged on the side of the body, the plurality of second protrusions are arranged at intervals along the circumference of the body, the second protrusions protrude from the second surface and abut against the first wall to form a second gap between the second surface and the first wall, and a gap is formed between two adjacent second protrusions along the circumference of the body, and the gap connects the first gap and the second gap.

[0032] In this way, multiple second protrusions can form multiple gaps, and the multiple gaps provide multiple gas flow locations on the insulating component, making it easier for gas to flow from the first gap, the gap and the second gap to the pressure relief mechanism in sequence, thereby improving the gas flow efficiency.

[0033] In certain embodiments, the body is formed with a groove, the groove is recessed from the second surface toward the first surface, and the groove is opposite to the pressure relief mechanism along the thickness direction of the body.

[0034] In this way, the groove can increase the area of ​​the second gap, facilitate the rapid flow of gas to the pressure relief mechanism, and improve the flow efficiency of the gas.

[0035] In some embodiments, the second protrusion abuts the second wall.

[0036] In this way, the plurality of second protrusions abut against the second wall, and the insulating component and the second wall have more contact positions, which can play a better positioning role for the insulating component.

[0037] In certain embodiments, an edge of the second face forms an edge of the insulating member.

[0038] Thus, the insulating member has a simple structure and is easier to form.

[0039] In certain embodiments, a dimension of the insulating member in a direction perpendicular to the thickness of the first wall is smaller than a dimension of the inner surface of the housing.

[0040] In this way, a gap may be formed between the edge of the insulating member and the second wall, facilitating gas flow from the first gap to the second gap through the edge of the insulating member.

[0041] In some embodiments, the electrode assembly includes a main body and a tab connected to the main body, and the battery cell includes an electrode terminal disposed on the first wall, the electrode terminal is connected to the tab, and an insulating layer is provided between the electrode terminal and the main body.

[0042] In this way, the electrode terminals are electrically connected to the tabs, and the electrical energy of the battery cells can be output or input to charge and discharge the battery cells.

[0043] In certain embodiments, the first wall and the second wall enclose a housing of the battery cell and are integrally formed; the housing includes a third wall, the third wall being opposite to the first wall, and the third wall being formed as a cover and connected to the second wall.

[0044] In this way, the outer shell formed by the first wall, the second wall and the third wall forms a closed space for accommodating the electrode assembly, isolating the electrode assembly from the external environment, and improving the safety of the battery cell.

[0045] In certain embodiments, the first wall has a wall thickness of 0.5 mm to 3 mm.

[0046] In this way, when the thickness of the first wall is within the above range, the weight of the outer shell can be reduced while meeting the strength requirements of the first wall, thereby improving the safety and practicality of the battery cell.

[0047] In a second aspect, the present application provides a battery comprising the battery cell in any of the above embodiments.

[0048] In a third aspect, the present application provides an electrical device, which includes a battery cell or battery in any of the above embodiments, and the battery cell or battery is used to provide electrical energy.

[0049] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0051] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0052] FIG2 is a schematic structural diagram of a battery according to some embodiments of the present application;

[0053] FIG3 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0054] FIG4 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0055] FIG5 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0056] FIG6 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0057] FIG7 is a schematic structural diagram of an insulating member according to some embodiments of the present application;

[0058] FIG8 is a schematic structural diagram of an insulating member according to some embodiments of the present application;

[0059] FIG9 is a front view of a battery cell according to some embodiments of the present application;

[0060] FIG10 is a cross-sectional view taken along the AA direction in FIG9 ;

[0061] FIG11 is a schematic structural diagram of an insulating component according to some embodiments of the present application;

[0062] FIG12 is a schematic structural diagram of an insulating member according to some embodiments of the present application;

[0063] FIG13 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0064] FIG14 is a side view of a battery cell according to some embodiments of the present application;

[0065] FIG15 is a cross-sectional view of FIG14 along the BB direction.

[0066] Explanation of the accompanying drawings: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, casing; 11, first part; 12, second part; 20, battery cell; 21, casing; 211, first wall; 212, second wall; 213, electrode terminal; 214, third wall; 22, electrode assembly; 221, arcuate surface; 222, main body; 223, tab; 23, pressure relief mechanism; 24, insulating member; 241, main body; 242, first protrusion; 243, first surface; 244, second surface; 245, bottom surface; 246, side surface; 247, second protrusion; 248, groove; 249, notch; 25, first gap; 26, air flow channel; 261, through hole; 262, through hole; 263, mounting hole; 264, second gap; 27, insulating layer. DETAILED DESCRIPTION

[0067] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0069] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0070] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0071] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0072] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

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

[0074] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0075] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0076] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0077] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0078] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure that high currents can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0079] The battery cell also includes a shell and an insulating member. The shell includes a first wall and a second wall. The electrode assembly is arranged in the second wall. The insulating member is arranged on the side of the first wall facing the interior of the battery cell. The insulating member is used to insulate and isolate the electrode assembly and the first wall.

[0080] The battery cell further includes a pressure relief mechanism, which may be provided on the first wall to release the internal pressure or temperature of the battery cell.

[0081] A pressure relief mechanism is an element or component that activates to release the internal pressure or temperature of a battery cell when the internal pressure or temperature reaches a predetermined threshold. The pressure relief mechanism can take the form of an explosion-proof valve, air valve, pressure relief valve, or safety valve, and can specifically employ a pressure-sensitive or temperature-sensitive element or structure. Specifically, when the internal pressure or temperature of a battery cell reaches a predetermined threshold, the pressure relief mechanism activates or a weakened structure within the pressure relief mechanism is destroyed, thereby creating an opening or channel for the internal pressure or temperature to be released.

[0082] The "activation" mentioned in this application refers to the action of the pressure relief mechanism or its activation to a certain state, thereby allowing the internal pressure and temperature of the battery cell to be released. The action produced by the pressure relief mechanism may include, but is not limited to: at least a portion of the pressure relief mechanism is ruptured, broken, torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the pressure of the battery cell can be relieved under controllable pressure, thereby avoiding potential more serious accidents.

[0083] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery safety must also be considered.

[0084] In the prior art, the first wall and second wall of a battery cell are welded together, and an insulating member is disposed on the side of the first wall facing the interior of the battery cell. A protrusion is disposed on the side of the insulating member facing the electrode assembly, which is used to abut against the electrode assembly to achieve positioning of the electrode assembly. Because the pressure relief mechanism on the first wall is disposed in the middle of the first wall, and an intermediate protrusion is disposed on the insulating member at a position corresponding to the pressure relief mechanism, the intermediate protrusion abuts against the electrode assembly to reduce shaking of the electrode assembly. At the same time, a through-hole extending along the thickness direction of the insulating member is provided on the surface of the intermediate protrusion facing the electrode assembly. However, when thermal runaway occurs in the battery cell, the pressure relief mechanism (such as an explosion-proof valve) still has the problem of not being able to release pressure in a timely manner. Analysis found that when thermal runaway occurs in a local area of ​​the battery cell, the gas production in this local area is large, and the air pressure in this area rises rapidly. The through hole of the middle protrusion facing the electrode assembly is covered by the electrode assembly. Due to the obstruction of the middle protrusion, the fluidity of the gas on both sides of the middle protrusion is poor, and the amount of gas flowing from the inside of the battery cell toward the pressure relief mechanism is small. At the moment when the pressure relief mechanism releases pressure, the gas generated in the area with large gas production cannot flow quickly to the pressure relief mechanism for discharge, causing the gas in this area to impact the nearby second wall, causing the weld between the second wall and the first wall to crack, resulting in the risk of fire and explosion.

[0085] To improve the safety of a battery cell, the present application provides an insulating member for use with a battery cell. The insulating member includes a body and a first protrusion. The body has a first surface and a second surface disposed opposite each other along its thickness direction, the first surface facing the electrode assembly of the battery cell, and the second surface facing away from the electrode assembly. The first protrusion is formed on the first surface and is configured to abut against the electrode assembly. The first protrusion is provided with a through hole that extends through the first protrusion in a direction intersecting the thickness direction. The through hole facilitates gas flow in a direction intersecting the thickness direction and through the first protrusion, reducing the obstruction of the first protrusion to gas flow, improving the smoothness of gas flow, and facilitating gas flow toward a pressure relief mechanism disposed on the first wall.

[0086] In a battery cell composed of such an insulating component, since the through hole passes through the first protrusion in a direction intersecting with the thickness direction, in other words, the extension direction of the through hole intersects with the thickness direction of the insulating component body, and the through hole passes through the first protrusion, the gas can quickly pass through the first protrusion when flowing through the first protrusion, reducing the obstruction of the first protrusion to the gas flow and facilitating the flow of gas; when thermal runaway occurs in the battery cell and the pressure relief mechanism is actuated, the gas can quickly flow from the gas-producing area toward the pressure relief mechanism to be discharged from the pressure relief mechanism, reducing the risk of cracking and failure of the weld between the first wall and the second wall, and improving the safety of the battery cell.

[0087] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical equipment.

[0088] The present invention provides an electrical device that uses a battery cell as a power source. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0089] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0090] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0091] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0092] In some embodiments, the battery 100 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0093] Please refer to Figure 2, which is a schematic diagram of the exploded structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and can adopt a variety of structures.

[0094] In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which cover each other and together define a storage space for accommodating the battery cells 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 may also be hollow structures with one end open, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0095] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0096] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0097] According to some embodiments of the present application, please refer to Figures 3 and 4. Figure 3 is a schematic structural diagram of a battery cell 20 according to some embodiments of the present application; Figure 4 is a schematic exploded structural diagram of a battery cell 20 according to some embodiments of the present application. The battery cell 20 of the embodiment of the present application includes a housing 21, an electrode assembly 22, a pressure relief mechanism 23, and an insulating member 24. The housing 21 includes a first wall 211 and a second wall 212 connected to the first wall 211. The electrode assembly 22 is disposed in the housing 21. The second wall 212 surrounds the electrode assembly 22. A first gap 25 is formed between the electrode assembly 22 and the second wall 212. The pressure relief mechanism 23 is disposed on the first wall 211. The insulating member 24 is disposed between the first wall 211 and the electrode assembly 22. The insulating member 24 is used to form an airflow channel 26 connected to the first gap 25. The airflow channel 26 extends to the pressure relief mechanism 23.

[0098] Specifically, the housing 21 is a hollow structure, forming a chamber within it for accommodating the electrode assembly 22 and the electrolyte. The housing 21 can have various shapes, such as a cylinder or a rectangular parallelepiped. The shape of the housing 21 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical housing 21 can be used; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 21 can be used.

[0099] The first wall 211 and the second wall 212 are arranged perpendicularly and sealed together to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. The first wall 211 and the second wall 212 can be integrally formed or welded together. The shape of the first wall 211 can be adapted to match the shape of the second wall 212. The first wall 211 can have a circular or square planar structure. Optionally, the first wall 211 can be made of a material with a certain degree of hardness and strength, such as an aluminum alloy. This makes the first wall 211 less susceptible to deformation during compression and collision, providing the battery cell 20 with greater structural strength and improved safety. The second wall 212 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the second wall 212 can be determined based on the specific shape and size of the electrode assembly 22. The second wall 212 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, and aluminum alloy. The material of the first wall 211 and the second wall 212 can be the same or different.

[0100] The electrode assembly 22 is the core component that enables the charge and discharge functions of the battery cell 20. It includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive and negative electrode sheets have opposite polarities, and the separator is used to insulate the positive and negative electrode sheets. The electrode assembly 22 primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0101] The pressure relief mechanism 23 is used to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. When thermal runaway occurs in the electrode assembly 22, high-temperature gases generated within the second wall 212 can reach the pressure relief mechanism 23. The impact forces the pressure relief mechanism 23 open, allowing the high-temperature gases to be released promptly, improving the safety of the battery cell 20. It should be noted that the pressure relief mechanism 23 can be located on either the first wall 211 or the second wall 212.

[0102] The insulating member 24 is disposed on the side of the first wall 211 facing the interior of the battery cell 20 and can be used to isolate the electrical connection components in the second wall 212 from the first wall 211 to reduce the risk of short circuit.

[0103] The first gap 25 is the gap between the electrode assembly 22 and the second wall 212 , and the airflow channel 26 is a channel for gas flow. The airflow channel 26 connects the first gap 25 and the pressure relief mechanism 23 , and the gas can flow from the first gap 25 to the pressure relief mechanism 23 through the airflow channel 26 .

[0104] In the battery cell 20 of the embodiment of the present application, the air flow channel 26 formed by the insulating component 24 connects the first gap 25 and the pressure relief mechanism 23, reducing the obstruction of the insulating component 24 to the gas flow and facilitating the flow of gas; when the battery cell 20 fails thermally and the pressure relief mechanism 23 is actuated, the gas can flow quickly from the gas-producing area toward the pressure relief mechanism 23 to be discharged from the pressure relief mechanism 23, reducing the risk of sealing failure of the first wall 211 and the second wall 212, and improving the safety of the battery cell 20.

[0105] Referring to FIG. 4 , in some embodiments, the air flow channel 26 and the first gap 25 are directly opposite to each other in the thickness direction of the first wall 211 .

[0106] Specifically, the first gap 25 extends toward the insulating member 24 along the thickness direction of the first wall 211 , and the air flow channel 26 extends from the insulating member 24 toward the pressure relief mechanism 23 along the thickness direction of the first wall 211 .

[0107] In this way, the path of the gas flowing from the first gap 25 to the first wall 211 is shortened, which facilitates the gas to quickly reach the pressure relief mechanism 23 and improves the smoothness of the gas flow.

[0108] 4 and 5 , FIG5 is a schematic diagram of the structure of a battery cell 20 in some embodiments of the present application. In some embodiments, the electrode assembly 22 is wound into a wound structure and has an arcuate surface 221 . A first gap 25 is formed between the arcuate surface 221 and the second wall 212 .

[0109] Specifically, the arcuate surface 221 may be in contact with the second wall 212 or may be spaced apart from the second wall 212. The plane of the electrode assembly 22 that is tangent to the arcuate surface 221 may be in contact with the second wall 212 or may be spaced apart from the second wall 212. The gap between the arcuate surface 221 and the plane and the second wall 212 forms a first gap 25.

[0110] In this way, the arcuate surface 221 can increase the cross-sectional area of ​​the first gap 25, thereby facilitating the rapid flow of gas toward the pressure relief mechanism 23 and improving the flow efficiency of the gas.

[0111] Please refer to Figures 4 and 6 , which are schematic diagrams of the structure of a battery cell 20 according to some embodiments of the present application. In some embodiments, there are multiple electrode assemblies 22, which are arranged in parallel, with a first gap 25 formed between two curved surfaces 221 and second walls 212 of adjacent electrode assemblies 22.

[0112] Specifically, the number of electrode assemblies 22 can be two, three, four, etc., and multiple electrode assemblies 22 are stacked along the thickness direction of the electrode assembly 22, and the gap between the arcuate surfaces 221 on both sides of the electrode assembly 22 and the second wall 212 forms a first gap 25.

[0113] In this way, a first gap 25 is formed between each electrode assembly 22 and the second wall 212, which facilitates the rapid flow of gas to the pressure relief mechanism 23 and improves the gas circulation efficiency; in addition, multiple electrode assemblies 22 can increase the energy density of the battery cell 20.

[0114] Please refer to Figures 7 and 8. Figure 7 is a schematic diagram of the structure of the insulating member 24 in some embodiments of the present application; Figure 8 is a schematic diagram of the structure of the insulating member 24 in some embodiments of the present application. In certain embodiments, the insulating member 24 includes a body 241 and a first protrusion 242. The body 241 includes a first surface 243 and a second surface 244 disposed opposite to each other along its thickness direction. The first surface 243 faces the electrode assembly 22. The first protrusion 242 is disposed on the first surface 243 and abuts the electrode assembly 22. The airflow channel 26 includes a through hole 261 formed in the first protrusion 242.

[0115] Specifically, the body 241 can be a rectangular plate-like structure, with a first surface 243 facing the electrode assembly 22 and a second surface 244 facing away from the electrode assembly 22. The first surface 243 and the second surface 244 are two surfaces of the body 241 that are arranged opposite each other along the thickness direction. The first protrusion 242 is formed on the first surface 243 and is used to mate with the electrode assembly 22. The first protrusion 242 can be integrally formed with the body 241, for example, by heat-melting the first protrusion 242 and the body 241. There can be two first protrusions 242, with the two first protrusions 242 being disposed at opposite ends of the body 241 along the length direction of the body 241. There can be four first protrusions 242, with the four first protrusions 242 being distributed at the four corners of the body 241 along the length and width direction of the body 241. The through hole 261 can be a regular hole such as a circular or square hole, or an irregular hole. The through hole 261 extends through the first protrusion 242 and communicates with the first gap 25.

[0116] In this way, the first protrusion 242 abuts against the electrode assembly 22, which can reduce the shaking of the electrode assembly 22. At the same time, the first protrusion 242 increases the gap between the electrode assembly 22 and the first surface 243, so that the gas can flow to the pressure relief mechanism 23 through the through hole 261, thereby improving the gas circulation efficiency.

[0117] In some embodiments, the height of the first protrusion 242 is 0.1 mm to 4 mm.

[0118] Specifically, the height direction of the first protrusion 242 is parallel to the thickness direction of the body 241, and the height of the first protrusion 242 can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0119] In this way, when the height of the first protrusion 242 is within the above range, the weight of the insulating member 24 can be reduced while meeting the strength requirement of the first protrusion 242 , thereby improving the safety and practicality of the battery cell 20 .

[0120] 6 and 7 , in some embodiments, the first protrusion 242 includes a bottom surface 245 and a side surface 246 . The bottom surface 245 abuts against the electrode assembly 22 , the side surface 246 connects the first surface 243 and the bottom surface 245 , and the through hole 261 passes through the side surface 246 .

[0121] Specifically, the bottom surface 245 is the surface of the first protrusion 242 facing the electrode assembly 22. In other words, the bottom surface 245 is the surface of the first protrusion 242 away from the first surface 243. The side surface 246 is disposed around the bottom surface 245 and is vertically arranged around the edge of the bottom surface 245.

[0122] In this way, the through hole 261 passes through the two opposite side surfaces 246 of the first protrusion 242 , so that gas can pass through the first protrusion 242 , thereby reducing the obstruction of the first protrusion 242 to the gas flow and improving the smoothness of the gas flow.

[0123] Referring to FIG. 7 , in some embodiments, the through hole 261 passes through the bottom surface 245 .

[0124] Specifically, in the thickness direction of the body 241 , the through hole 261 may extend from the first surface 243 toward the bottom surface 245 . There may be a certain distance between the through hole 261 and the bottom surface 245 , or the through hole 261 may pass through the bottom surface 245 .

[0125] In this way, the through hole 261 passes through the bottom surface 245, increasing the cross-sectional area of ​​the through hole 261, facilitating the rapid flow of gas to the pressure relief mechanism 23, and improving the gas circulation efficiency; in addition, the through hole 261 is also easier to form.

[0126] 11 , in some embodiments, the through hole 261 passes through the side surface 246 along the length direction of the body 241 . The through hole 261 has a dimension D along the width direction of the body 241 , and the width of the body 241 is W, where 0.1<D / W<0.9.

[0127] Specifically, in the length direction of the main body 241, the through hole 261 passes through the two opposite side surfaces 246 of the first protrusion 242, and the ratio of the size of the through hole 261 along the width direction of the main body 241 to the width size of the main body 241 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0128] Thus, when D / W is within the above range, the through hole 261 can be easily formed. In addition, the larger the ratio of the through hole 261 along the width direction of the body 241 to the width dimension of the body 241, the larger the size of the through hole 261 relative to the body 241, which facilitates the rapid flow of gas to the pressure relief mechanism 23 and improves the gas circulation efficiency.

[0129] In some embodiments, D and W may satisfy 0<D / W<1.

[0130] Please refer to Figures 4 and 7. In some embodiments, the air flow channel 26 includes a through-hole 262 formed in the main body 241. The through-hole 262 passes through the first surface 243 and the second surface 244. The through-hole 262 is opposite to the pressure relief mechanism 23 along the thickness direction of the main body 241. The through-hole 262 is connected to the through-hole 261.

[0131] Specifically, the perforation 262 is an area provided on the first surface 243 for communicating with the through hole 261. Gas can flow from the perforation 262 to the pressure relief mechanism 23. The perforation 262 can be a hollow portion on the insulating member 24. For example, the perforation 262 can penetrate the body 241 in the thickness direction of the body 241, that is, the perforation 262 can extend from the first surface 243 to the second surface 244. The perforation 262 can be rectangular, square, etc. The number of perforations 262 can be two, three, four, etc. The number, size and distance between two adjacent perforations 262 can be set according to actual needs. The perforations 262 are evenly distributed in the center of the body 241, and the pressure relief mechanism 23 is provided in the center of the first wall 211 so that the gas can reach the pressure relief mechanism 23 through the perforations 262, thereby shortening the flow distance of the gas.

[0132] In this way, the gas can flow from the first gap 25 to the pressure relief mechanism 23 through the through-hole 262 , thereby increasing the number of gas flow paths and improving the gas circulation efficiency.

[0133] Please refer to Figures 4 and 7. In some embodiments, the air flow channel 26 includes a mounting hole 263 formed in the main body 241. The mounting hole 263 passes through the first surface 243 and the second surface 244. The first protrusion 242 is set at the edge of the mounting hole 263. The mounting hole 263 is used to lead out the electrical energy of the battery cell 20.

[0134] Specifically, the mounting hole 263 is an area provided on the first surface 243 for communicating with the through hole 261. The shape of the mounting hole 263 can be square, circular, or oval. The mounting hole 263 can be a hollow portion on the insulating member 24. For example, the mounting hole 263 can penetrate the body 241 in the thickness direction, that is, the mounting hole 263 can extend from the first surface 243 to the second surface 244. There can be two mounting holes 263, and the two mounting holes 263 can be provided along the length of the body 241 at either end of the through hole 262.

[0135] In this way, the electrode assembly 22 can charge and discharge the battery cell 20 through the mounting hole 263. In addition, the gas can also flow to the pressure relief mechanism 23 through the mounting hole 263, thereby increasing the number of gas flow paths and improving the gas circulation efficiency.

[0136] Referring to Figures 4, 9, and 10, Figure 9 is a front view of a battery cell 20 according to some embodiments of the present application, and Figure 10 is a cross-sectional view taken along line AA of Figure 9. In some embodiments, a second gap 264 is formed between the second surface 244 and the first wall 211, and the airflow channel 26 includes the second gap 264.

[0137] Specifically, the gap between the second surface 244 and the first wall 211 forms a second gap 264 . The second gap 264 connects the first gap 25 and the pressure relief mechanism 23 . Gas can flow from the first gap 25 to the pressure relief mechanism 23 through the second gap 264 .

[0138] In this way, the size of the second gap 264 is relatively large, and the gas can flow to the pressure relief mechanism 23 through the second gap 264, which facilitates the gas to flow to the pressure relief mechanism 23 quickly, thereby improving the gas circulation efficiency.

[0139] Please refer to Figures 4, 8 and 10. In some embodiments, the insulating member 24 includes a plurality of second protrusions 247 arranged on the side surface 246 of the main body 241. The plurality of second protrusions 247 are arranged at intervals along the circumference of the main body 241. The second protrusions 247 protrude from the second surface 244 and abut against the first wall 211 to form a second gap 264 between the second surface 244 and the first wall 211. Along the circumference of the main body 241, a notch 249 is formed between two adjacent second protrusions 247. The notch 249 connects the first gap 25 and the second gap 264.

[0140] Specifically, the number of second protrusions 247 can be two, three, four, five, six, etc., and the plurality of second protrusions 247 are symmetrically arranged along the length and width directions of the body 241. The second protrusions 247 protrude from the second surface 244 and abut against the first wall 211. The second gap 264 is the gap formed between the second surface 244 and the first wall 211, that is, the second gap 264 is the gap formed between the second surface 244 and the top surface of the second protrusions 247. The notch 249 is the gap formed between two adjacent second protrusions 247, and gas can flow from the first gap 25 to the second gap 264 through the notch 249.

[0141] In this way, multiple second protrusions 247 can form multiple gaps 249. Multiple gaps 249 provide multiple gas flow positions on the insulating component 24, which facilitates the gas to flow from the first gap 25, the gap 249 and the second gap 264 to the pressure relief mechanism 23 in sequence, thereby improving the gas flow efficiency.

[0142] 4 , 7 and 8 , in some embodiments, the body 241 is formed with a groove 248 , which is recessed from the second surface 244 toward the first surface 243 . The groove 248 is opposite to the pressure relief mechanism 23 along the thickness direction of the body 241 .

[0143] Specifically, the shape of the groove 248 can be regular, such as circular or square, or irregular, and the number of grooves 248 can be one or more. The groove 248 can be provided at the edge of the mounting hole 263 or at the edge of the through-hole 262. The grooves 248 can be symmetrically arranged along the length and width of the body 241.

[0144] In this way, the groove 248 can increase the area of ​​the second gap 264, thereby facilitating the rapid flow of gas to the pressure relief mechanism 23 and improving the flow efficiency of the gas.

[0145] Referring to FIG. 4 , in some embodiments, the second protrusion 247 abuts against the second wall 212 .

[0146] Specifically, the second protrusion 247 protrudes from the edge of the body 241 along the length direction and the width direction of the body 241 , and the gap between the edge of the body 241 and the second wall 212 forms a notch 249 .

[0147] In this way, the plurality of second protrusions 247 abut against the second wall 212 , and the insulating member 24 and the second wall 212 have more contact positions, which can play a better positioning role for the insulating member 24 .

[0148] 11 and 12 , FIG11 is a schematic diagram of the structure of the insulating member 24 in some embodiments of the present application; FIG12 is a schematic diagram of the structure of the insulating member 24 in some embodiments of the present application. In some embodiments, the edge of the second surface 244 forms the edge of the insulating member 24.

[0149] Specifically, the edge of the body 241 forms the edge of the insulating member 24. That is, the length of the body 241 may be the length of the insulating member 24, and the width of the body 241 may be the width of the insulating member 24. The size of the insulating member 24 may be smaller than the size of the inner surface of the housing 21, or the size of the insulating member 24 may be equal to the size of the inner surface of the housing 21.

[0150] Thus, the insulating member 24 has a simple structure and is easier to form.

[0151] 4 and 13 , FIG13 is a schematic structural diagram of a battery cell 20 according to some embodiments of the present application. In some embodiments, the insulating member 24 is smaller than the inner surface of the housing 21 in a direction perpendicular to the thickness of the first wall 211 .

[0152] Specifically, the length dimension of the main body 241 may be smaller than the length dimension of the first wall 211, the width dimension of the main body 241 may be smaller than the width dimension of the first wall 211, or the length dimension and width dimension of the main body 241 may be smaller than the length dimension and width dimension of the first wall 211 respectively.

[0153] In this way, a gap may be formed between the edge of the insulating member 24 and the second wall 212 , facilitating gas flow from the first gap 25 to the second gap 264 through the edge of the insulating member 24 .

[0154] Please refer to Figures 4, 14, and 15. Figure 14 is a side view of a battery cell 20 according to some embodiments of the present application; Figure 15 is a cross-sectional view along line BB of Figure 14. In certain embodiments, the electrode assembly 22 includes a main body 222 and a tab 223 connected to the main body 222. The battery cell 20 includes an electrode terminal 213 disposed on the first wall 211. The electrode terminal 213 is connected to the tab 223, and an insulating layer 27 is disposed between the electrode terminal 213 and the main body 222.

[0155] Specifically, the main body 222 can be a wound body of the electrode assembly 22, and the number of tabs 223 can be two, namely a positive tab 223 and a negative tab 223. The positive tab 223 and the negative tab 223 can be located at one end of the main body 222 or at both ends of the main body 222. The electrode terminal 213 can be used to electrically connect to the electrode assembly 22 to output or input electrical energy to the battery cell 20. The tab 223 is connected to the electrode terminal 213 of the first wall 211 through the mounting hole 263 to form a current loop. The insulating layer 27 can be insulated by spraying an insulating material or gluing a high-temperature resistant insulating material.

[0156] In this way, the electrode terminal 213 is electrically connected to the tab 223 , so that the electric energy of the battery cell 20 can be output or input to charge and discharge the battery cell 20 .

[0157] 4 , in some embodiments, the first wall 211 and the second wall 212 enclose the outer shell 21 of the battery cell 20 and are integrally formed; the outer shell 21 includes a third wall 214 , which is opposite to the first wall 211 and is formed as a cover and connected to the second wall 212 .

[0158] Specifically, the second wall 212 and the third wall 214 are arranged perpendicularly and are detachably connected. The shape of the third wall 214 can be adapted to the shape of the second wall 212 to match the second wall 212. The third wall 214 can be a circular or square planar structure. Optionally, the third wall 214 can be made of a material with a certain hardness and strength, such as an aluminum alloy. In this way, the third wall 214 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. In some embodiments, the second wall 212 and the third wall 214 surround the outer shell 21 of the battery cell 20 and are integrally formed, and the first wall 211 is formed as a cover and is detachably connected to the second wall 212.

[0159] In this way, the housing 21 surrounded by the first wall 211 , the second wall 212 and the third wall 214 forms a closed space for accommodating the electrode assembly 22 , isolating the electrode assembly 22 from the external environment, and improving the safety of the battery cell 20 .

[0160] In some embodiments, the first wall 211 has a thickness of 0.5 mm to 3 mm.

[0161] Specifically, the wall thickness of the first wall 211 refers to the thickness of the first wall 211 in a direction parallel to the second wall 212 . The wall thickness of the first wall 211 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0162] In this way, when the thickness of the first wall 211 is within the above range, the weight of the outer shell 21 can be reduced while meeting the strength requirements of the first wall 211 , thereby improving the safety and practicality of the battery cell 20 .

[0163] 2 , a battery 100 according to an embodiment of the present application includes a battery cell 20 .

[0164] The battery 100 includes one or more battery cells 20 , and the battery 100 may include a battery module or a battery pack.

[0165] The electric device of the embodiment of the present application includes a battery cell 20 or a battery 100. The battery cell 20 or the battery 100 is used to provide electric energy to the electric device.

[0166] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing comprising a first wall and a second wall connected to the first wall; an electrode assembly disposed in the housing, wherein the second wall surrounds the electrode assembly, and a first gap is formed between the electrode assembly and the second wall; A pressure relief mechanism, arranged on the first wall; and, An insulating component is disposed between the first wall and the electrode assembly, and is used to form an air flow channel connected to the first gap, wherein the air flow channel extends to the pressure relief mechanism.

2. The battery cell according to claim 1, characterized in that: The air flow channel and the first gap are directly opposite to each other in the thickness direction of the first wall.

3. The battery cell according to claim 1, characterized in that: The electrode assembly is wound into a wound structure and forms an arc-shaped surface, and the first gap is formed between the arc-shaped surface and the second wall.

4. The battery cell according to claim 3, characterized in that: There are multiple electrode assemblies, which are arranged in parallel and are respectively located between two arc-shaped surfaces of adjacent electrode assemblies and the second wall to form the first gap.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The insulating component includes a main body and a first protrusion, the main body includes a first surface and a second surface arranged opposite to each other along a thickness direction thereof, the first surface faces the electrode assembly, the first protrusion is arranged on the first surface and abuts against the electrode assembly, and the airflow channel includes a through hole formed on the first protrusion.

6. The battery cell according to claim 5, characterized in that: The height of the first protrusion is 0.1 mm-4 mm.

7. The battery cell according to claim 5, characterized in that: The first protrusion includes a bottom surface and a side surface, the bottom surface abuts against the electrode assembly, the side surface connects the first surface and the bottom surface, and the through hole penetrates the side surface.

8. The battery cell according to claim 7, characterized in that: The through hole passes through the bottom surface.

9. The battery cell according to claim 7 or 8, characterized in that: The through hole passes through the side surface along the length direction of the body, the dimension of the through hole along the width direction of the body is D, the width of the body is W, and 0.1<D / W<0.

9.

10. The battery cell according to any one of claims 5 to 9, characterized in that: The air flow channel includes a through hole formed in the body, the through hole passes through the first surface and the second surface, the through hole is opposite to the pressure relief mechanism along the thickness direction of the body, and the through hole is communicated with the through hole.

11. The battery cell according to claim 10, characterized in that: The air flow channel includes a mounting hole formed in the body, the mounting hole passes through the first surface and the second surface, the first protrusion is arranged at an edge of the mounting hole, and the mounting hole is used to lead out the electric energy of the battery cell.

12. The battery cell according to any one of claims 5 to 10, characterized in that: A second gap is formed between the second surface and the first wall, and the air flow channel includes the second gap.

13. The battery cell according to claim 12, characterized in that: The insulating component includes a plurality of second protrusions arranged on the side surface of the body, the plurality of second protrusions are arranged at intervals along the circumference of the body, the second protrusions protrude from the second surface and abut against the first wall to form the second gap between the second surface and the first wall, and a notch is formed between two adjacent second protrusions along the circumference of the body, and the notch connects the first gap and the second gap.

14. The battery cell according to claim 12 or 13, characterized in that: The body is formed with a groove, the groove is recessed from the second surface toward the first surface, and the groove is opposite to the pressure relief mechanism along the thickness direction of the body.

15. The battery cell according to claim 13, characterized in that: The second protrusion abuts against the second wall.

16. The battery cell according to claim 12, characterized in that: An edge of the second face forms an edge of the insulating member.

17. The battery cell according to claim 16, characterized in that: The insulating member has a size smaller than a size of an inner surface of the housing in a thickness direction perpendicular to the first wall.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The electrode assembly includes a main body and a tab connected to the main body, and the battery cell includes an electrode terminal disposed on the first wall, the electrode terminal is connected to the tab, and an insulating layer is disposed between the electrode terminal and the main body.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The first wall and the second wall surround the outer shell of the battery cell and are formed in one piece; the outer shell includes a third wall, the third wall is opposite to the first wall, the third wall is formed as a cover and is connected to the second wall.

20. The battery cell according to claim 19, characterized in that: The thickness of the first wall is 0.5 mm-3 mm.

21. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 20.

22. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 20 or the battery according to claim 21.

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