Battery monomer, battery device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, a cover body and an electrode assembly, the shell comprises a main body part and a port part, a first cavity is formed in the main body part, a second cavity is formed in the port part, and the main body part is connected with the port part so that the first cavity is communicated with the second cavity; wherein the wall thickness of the port part is larger than that of the main body part, the cover body covers the port part, the cover body is provided with an exhaust port, the main body part is provided with an airflow channel, at least one end of the airflow channel extends to be close to the second cavity, the electrode assembly is located in the first cavity, and the end, close to the second cavity, of the airflow channel is located between the electrode assembly and the second cavity. Therefore, the risk that gas in the first cavity cannot be discharged from the gas flow channel to the second cavity is improved, and the risk that the gas in the second cavity cannot be discharged from the exhaust port of the cover body in time to damage the battery monomers is relieved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to sustainable development, which in turn promotes the adjustment of energy structure and drives the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology. Due to its advantages such as high energy density, good cycle life, high operating voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0003] A battery device includes one or more battery cells. During multiple cycles of charge and discharge, gas will be generated inside the battery cells due to side reactions of the electrochemical reaction. As the gas content increases, the air pressure inside the battery casing will also increase. If the gas cannot be properly guided out of the casing, the service life of the battery cells will be easily reduced. Utility Model Content

[0004] The main purpose of the present application is to provide a battery cell, a battery device and an electrical device, aiming to solve the technical problem in the prior art that it is difficult to draw out the gas in the shell.

[0005] To solve the above problems, the present application provides a battery cell, which includes a shell, a cover and an electrode assembly, the shell including a main body and a port portion, the main body forming a first cavity, the port portion forming a second cavity, the main body being connected to the port portion so that the first cavity and the second cavity are connected; wherein the wall thickness of the port portion is greater than the wall thickness of the main body, the cover is provided on the port portion, the cover is provided with an exhaust port, the main body is provided with an air flow channel, at least one end of the air flow channel extends close to the second cavity, the electrode assembly is located in the first cavity, and an end of the air flow channel close to the second cavity is located between the electrode assembly and the second cavity. Thus, at least one end of the airflow channel extends to near the second cavity, the electrode assembly is located in the first cavity, and one end of the airflow channel near the second cavity is located between the electrode assembly and the second cavity, so that at least part of the airflow channel and the electrode assembly can be avoided, thereby improving the risk that the electrode assembly deforms and blocks the airflow channel, resulting in the gas inside the first cavity being unable to be discharged from the airflow channel to the second cavity, and the wall thickness of the port part is greater than the wall thickness of the main body part, thereby improving the stability of the cover body covering the port part, and alleviating the risk that the gas in the second cavity cannot be discharged from the second cavity from the exhaust port of the cover body in time, resulting in excessive air pressure in the second cavity and damaging the battery cell.

[0006] In some embodiments, the inner sidewall of the port portion protrudes toward the inside of the housing relative to the inner sidewall of the main body; alternatively, the outer sidewall of the port portion protrudes toward the inside of the housing relative to the outer sidewall of the main body. Thus, the inner sidewall of the port portion protrudes toward the inside of the housing relative to the inner sidewall of the main body, which can reduce the diameter of the second cavity of the port portion, reduce the overall volume of the housing, and increase the energy density of the battery cell. The outer sidewall of the port portion protrudes toward the inside of the housing relative to the outer sidewall of the main body, which can expand the diameter of the second cavity of the port portion, reduce the accumulation of gas after entering the second cavity, and thus reduce the stability of the connection between the cover and the port portion.

[0007] In some embodiments, the inner sidewall of the port portion protrudes toward the inside of the shell relative to the inner sidewall of the main body portion, and the second cavity includes a first cavity segment and a second cavity segment that are interconnected. The second cavity segment is located between the first cavity segment and the first cavity. The aperture of the first cavity segment is smaller than the aperture of the second cavity segment, and the aperture of the second cavity segment gradually decreases from the first cavity to the first cavity segment. Thus, the aperture of the first cavity segment is smaller than the aperture of the second cavity segment, and the aperture of the second cavity segment gradually decreases from the first cavity to the first cavity segment. The change in the aperture of the second cavity segment can guide the gas in the first cavity through the airflow channel to the second cavity segment, thereby improving the efficiency of gas flow and reducing the risk of large airflow impact at the connection between the port portion and the main body.

[0008] In some embodiments, the distance between the end of the port away from the first cavity and the end closer to the first cavity is between 5 mm and 10 mm. Thus, by properly setting the distance between the end of the port away from the first cavity and the end closer to the first cavity, the utilization rate of the internal space of the housing affected by an excessively large distance can be improved. At the same time, the risk of damage to the electrode assembly during the fixing process of the cover and the housing due to the electrode assembly being too close to the cover due to an excessively small distance can be reduced.

[0009] In some embodiments, the distance between the end of the airflow channel closest to the second cavity and the electrode assembly is between 2 mm and 5 mm. Thus, by properly setting the distance between the end of the airflow channel closest to the second cavity and the electrode assembly, the efficiency of gas discharge from the first cavity to the second cavity, which is affected by a too small distance, can be improved, while the utilization rate of the internal space of the housing, which is affected by an excessively large distance, can also be improved.

[0010] In some embodiments, the wall thickness of the housing is between 0.6 mm and 1 mm. Thus, by properly setting the wall thickness of the housing, it is possible to facilitate the creation of airflow channels on the housing while improving the structural strength of the housing, thereby reducing the difficulty of manufacturing the housing.

[0011] In some embodiments, the difference between the wall thickness of the port portion and the wall thickness of the main body is between 0.2 mm and 0.3 mm. Thus, by properly setting the difference between the wall thickness of the port portion and the wall thickness of the main body, the stability of the cover body covering the port portion can be improved, and the risk of excessive air pressure in the second cavity, which could damage the battery cell, due to the inability of gas in the second cavity to be discharged from the second cavity through the vent of the cover body in a timely manner, can be mitigated.

[0012] In some embodiments, the gas flow channel includes a gas sub-channel that extends from an end distal to the second cavity to an end proximal to the second cavity. Thus, the gas sub-channel extends from an end distal to the second cavity to an end proximal to the second cavity, and gas in the first cavity distal to the second cavity end can be guided to the second cavity via the gas sub-channel, further efficiently exhausting the gas through the exhaust port on the cover.

[0013] In some embodiments, the number of the gas sub-channels is multiple, and the multiple gas sub-channels are spaced apart. Thus, the simultaneous opening of multiple gas sub-channels can improve the efficiency of guiding the gas to the second cavity and further efficiently exhaust the gas through the exhaust port on the cover.

[0014] In some embodiments, the spacing between two adjacent gas sub-channels is between 10 mm and 15 mm. Thus, by properly setting the spacing between two adjacent gas sub-channels, the utilization rate of the internal space of the housing is improved, so that a sufficient number of gas sub-channels can be arranged while taking into account the structural strength of the housing, thereby improving the gas exhaust efficiency.

[0015] In some embodiments, the inner sidewall of the main body is recessed to form the gas sub-channel, and the wall thickness of the main body is 3 to 10 times the depth of the gas sub-channel. Thus, the inner sidewall of the main body is recessed to form the gas sub-channel, thereby reducing the manufacturing cost of the housing while also mitigating the risk of low gas guidance efficiency due to a small gas sub-channel depth and the risk of abnormal damage to the housing due to a large gas sub-channel depth.

[0016] In some embodiments, the depth of the gas sub-channel is between 0.1 mm and 0.2 mm. Thus, by properly setting the depth of the gas sub-channel, the risk of low gas guidance efficiency due to a smaller gas sub-channel depth can be mitigated, as can the risk of abnormal damage to the housing due to a larger gas sub-channel depth.

[0017] In some embodiments, the width of the gas sub-channel is between 5 mm and 20 mm. Thus, by properly setting the width of the gas sub-channel, the risk of stress concentration at corresponding locations of the gas sub-channel due to a smaller width can be mitigated, as can the risk of reducing the overall structural strength of the housing due to a larger width of the gas sub-channel.

[0018] In some embodiments, the main body has two first inner side walls and two second inner side walls disposed opposite each other, the area of ​​the first inner side walls being larger than the area of ​​the second inner side walls, the first inner side walls being provided with the airflow channel, and / or both the first inner side walls and the second inner side walls being provided with the airflow channel. Thus, by providing the airflow channel on the first inner side wall having a larger surface area, the difficulty of forming the airflow channel can be reduced while improving the structural strength of the housing. Furthermore, by providing the airflow channel on the second inner side wall, the efficiency of gas discharge can be further improved.

[0019] To solve the above problems, the present application provides a battery device, which includes the battery cell as described above.

[0020] In order to solve the above problems, the present application provides an electrical device, which includes the battery device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments of the present application;

[0023] Figure 2 is a schematic diagram of the exploded structure of a battery device according to one or more embodiments of the present application;

[0024] Figure 3 is a schematic diagram of the disassembled structure of a battery cell according to one or more embodiments of the present application;

[0025] Figure 4 is a schematic diagram of a first cross-sectional structure of a battery cell according to one or more embodiments;

[0026] Figure 5 is a second cross-sectional structural schematic diagram of a battery cell according to one or more embodiments;

[0027] Figure 6 is a third cross-sectional structural schematic diagram of a battery cell according to one or more embodiments;

[0028] Figure 7 is a fourth cross-sectional structural schematic diagram of a battery cell according to one or more embodiments.

[0029] Figure numbers: vehicle 1; battery device 2; housing 20; first part 21; second part 22; controller 3; motor 4; battery cell 10; housing 100; main body 110; first cavity 111; port 120; second cavity 121; first cavity section 1211; second cavity section 1212; air flow channel 130; gas sub-channel 131; first inner side wall 141; second inner side wall 142; electrode assembly 200; cover 300; exhaust port 310. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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).

[0036] 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.

[0037] 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.

[0038] Currently, market developments indicate that batteries are increasingly being 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 cars, as well as in aerospace and other fields. As battery applications continue to expand, market demand is also growing.

[0039] Batteries mentioned in this field can be categorized as either primary batteries or rechargeable batteries, depending on whether they are rechargeable. Primary batteries are also called "disposable" batteries or primary batteries because once they are depleted, they cannot be recharged and must be discarded. Rechargeable batteries are also called secondary batteries, secondary batteries, or storage batteries. Rechargeable batteries are manufactured using different materials and processes than primary batteries. Their advantage is that they can be reused multiple times after charging, and their output current capacity is higher than that of most primary batteries. Common types of rechargeable batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries offer advantages such as light weight, high capacity (1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and a very low self-discharge rate. Consequently, despite their relatively high price, they are widely used. Lithium-ion batteries are also widely used in pure electric vehicles and hybrid vehicles. While the capacity of lithium-ion batteries used for these applications is relatively low, they offer higher output, higher charging current, and a longer service life, albeit at a higher cost.

[0040] The batteries described in the embodiments of this application are either rechargeable batteries or disposable batteries. The embodiments disclosed herein will be described primarily using lithium-ion batteries as an example. It should be understood that the embodiments disclosed herein are applicable to any other suitable type of rechargeable battery. The batteries described in the embodiments disclosed herein can be directly or indirectly used in appropriate devices to power such devices.

[0041] A battery device includes one or more battery cells. During multiple cycles of charge and discharge, gas will be generated inside the battery cells due to side reactions of the electrochemical reaction. As the gas content increases, the air pressure inside the battery casing will also increase. If the gas cannot be properly guided out of the casing, the service life of the battery cells will be easily reduced.

[0042] In order to solve the relevant technical problems, the battery cell provided in the present application is provided with an air flow channel inside the shell, and an electrode assembly is placed inside the shell. The air flow channel will not be at least partially blocked by the electrode assembly, so that the gas inside the shell can flow to the port of the shell through the air flow channel. The thickness of the shell port is relatively large, which can facilitate the strengthening of the connection relationship between the shell and the cover body, thereby reducing the impact of the gas on the fixed relationship between the shell and the cover body during the process of discharging the shell through the exhaust port of the cover body.

[0043] Specifically, the present application provides an electrical device, which may include, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. Among them, the electrical device may include a battery, and the electrical device may use the battery to provide electrical energy to achieve corresponding functions.

[0044] The present application also provides an electric vehicle, which may include a battery device.

[0045] Please refer to Figure 1 , Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments of the present application.

[0046] Vehicle 1 can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Vehicle 1 is internally provided with a battery assembly 2, which can be located at the bottom, front, or rear of vehicle 1. Battery assembly 2 can be used to power vehicle 1, for example, as an operating power source for vehicle 1. Vehicle 1 also includes a controller 3 and a motor 4. Controller 3 controls battery assembly 2 to power motor 4, for example, to meet the power requirements of vehicle 1 for starting, navigation, and driving.

[0047] In some embodiments of the present application, the battery device 2 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0048] In order to improve the performance of the electrical device, the present application also provides a battery device, see Figure 2 , Figure 2 is a schematic diagram of the exploded structure of a battery device according to one or more embodiments of the present application.

[0049] The shape of the battery device 2 may include but is not limited to a square, cylindrical, or other arbitrary shapes.

[0050] In some embodiments, the battery device 2 may include a housing 20 and a battery cell 10, with the battery cell 10 being housed within the housing 20. The housing 20 is used to provide a storage space for the battery cell 10, and the housing 20 may adopt a variety of structures. In some embodiments, the housing 20 may include a first portion 21 and a second portion 22, the first portion 21 and the second portion 22 overlapping each other, and the first portion 21 and the second portion 22 jointly define a storage space for accommodating the battery cell 10. The second portion 22 may be a hollow structure with one end open, and the first portion 21 may be a plate-like structure, with the first portion 21 overlapping the open side of the second portion 22, so that the first portion 21 and the second portion 22 jointly define a storage space; the first portion 21 and the second portion 22 may also be hollow structures both with one side open, with the open side of the first portion 21 overlapping the open side of the second portion 22.

[0051] In the battery device 2, there may be multiple battery cells 10, which 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 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 10 may be housed within the housing 20. Alternatively, the battery device 2 may comprise multiple battery cells 10 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 20. The battery device 2 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 10.

[0052] The battery cell 10 can be manufactured in two ways: laminated and wound. Laminated batteries have a uniform current collection effect, low internal resistance, and high specific power. However, in order to improve precision, they require extremely high mold precision, high equipment investment, and a relatively complex process, resulting in low production efficiency. Wound batteries are simple to manufacture, with average equipment precision requirements for the production and assembly processes, high production efficiency, and low cost. In terms of performance, wound batteries have excellent high and low temperature performance, charge very quickly, have an ultra-long life, stable high output voltage, a sturdy structure, and strong shock resistance.

[0053] However, during multiple charge and discharge cycles, battery cells will produce gas due to side reactions of the electrochemical reaction. As the gas content increases, the gas pressure inside the battery shell will also increase. If the gas cannot be properly guided to the outside of the shell, the service life of the battery cells will be easily reduced.

[0054] In order to solve the technical problems existing in the related art, the present application provides a battery cell, see Figure 3 and Figure 4 , Figure 3is a schematic diagram of the disassembled structure of a battery cell according to one or more embodiments of the present application, Figure 4 is a schematic diagram of a first cross-sectional structure of a battery cell according to one or more embodiments.

[0055] The battery cell 10 includes a shell 100, a cover 300 and an electrode assembly 200. The shell 100 includes a main body 110 and a port portion 120. The main body 110 forms a first cavity 111, and the port portion 120 forms a second cavity 121. The main body 110 and the port portion 120 are connected to make the first cavity 111 and the second cavity 121 communicate with each other; wherein the wall thickness of the port portion 120 is greater than the wall thickness of the main body 110, the cover 300 is covered on the port portion 120, the cover 300 is provided with an exhaust port 310, the main body 110 is provided with an air flow channel 130, at least one end of the air flow channel 130 extends to near the second cavity 121, the electrode assembly 200 is located in the first cavity 111, and one end of the air flow channel 130 near the second cavity 121 is located between the electrode assembly 200 and the second cavity 121.

[0056] The housing 100 can have any shape. For example, shapes include, but are not limited to, square, cylindrical, and prismatic. The housing 100 has a hollow recessed structure, and the electrode assembly 200 can be placed within the recessed portion of the housing 100. The cover 300 is positioned over the opening of the recessed portion of the housing 100 and secured to the housing 100 by welding or other means. The cover 300 can be an end cap, which is a component that fits over the opening of the housing 100 to isolate the internal environment of the battery cell 10 from the external environment. The shape of the end cap can be adapted to the shape of the housing 100 to ensure compatibility with the housing 100. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as aluminum alloy). This reduces deformation during compression and collision, providing the battery cell 10 with greater structural strength and improved safety. Functional components, such as electrode terminals, can be provided on the end cap for current output and connection to external circuits. The end cap may be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may be provided on the inner side of the end cap to isolate the electrical connection components in the housing 100 from the end cap to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, etc.

[0057] The housing 100 can be divided into a main body 110 and a port portion 120. The main body 110 serves as the bottom of the housing 100, and the port portion 120 serves as the opening of the housing 100. The main body 110 has a bottom wall and side walls. The side walls of the main body 110 are connected to the bottom wall of the main body 110 to form a first cavity 111. The port portion 120 can have a side wall. The side wall of the port portion 120 can be cylindrical to form a second cavity 121. The end of the side wall of the main body 110 away from the bottom wall is connected to the side wall of the port portion 120, thereby connecting the first cavity 111 and the second cavity 121. The shapes of the side walls of the main body 110 and the port portion 120 can be the same or similar. For example, the shapes of the side walls of the main body 110 and the port portion 120 can both be cylindrical or square. Among them, the wall thickness of the port part 120 is greater than the wall thickness of the main body 110, which can make the surface area of ​​the port part 120 in contact with the cover body 300 larger. When the cover body 300 is covered on the port part 120, the stability of the connection between the cover body 300 and the shell 100 can be further increased.

[0058] The cover 300 may be provided with an exhaust port 310, through which gas inside the housing 100 can be discharged from the housing 100. The exhaust port 310 may be a through hole, and an explosion-proof valve may be provided on the exhaust port 310. The explosion-proof valve may be fixedly connected to the cover 300. The explosion-proof valve is used to connect the interior of the housing 100 with the exterior of the housing 100 so that gas inside the housing 100 can exit the interior of the housing 100 through the explosion-proof valve. For example, the explosion-proof valve can be used to release internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. In some embodiments, a pressure relief hole may be provided on the cover 300, which passes through opposite surfaces of the wall. The explosion-proof valve can block the pressure relief hole so that gas in the accommodation space can exit the interior of the housing 100 through the explosion-proof valve. For example, during multiple charge and discharge cycles of a battery cell 10, gas may be generated inside the housing 100 due to side reactions of the electrochemical reaction. As the gas content increases, the air pressure inside the housing 100 also increases. This increase in air pressure inside the housing 100 can easily cause the housing 100 of the battery cell 10 to deform, thereby causing the structural strength of the housing 100 to fail. When the internal pressure of the battery cell 10 reaches a threshold, the air pressure inside the housing 100 can be released through an explosion-proof valve.

[0059] The electrode assembly 200 is the component within the battery cell 10 where the electrochemical reaction occurs. There can be one or more electrode assemblies 200. The electrode assembly 200 is primarily composed of a positive electrode sheet and a negative electrode sheet wound or stacked, typically with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body 110 of the electrode assembly 200, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body 110 or separately at opposite ends. During the battery's charge and discharge processes, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current circuit. In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge processes of the battery cell 10, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0060] The air flow channel 130 can be opened on the inner wall of the main body 110. The air flow channel 130 is connected to the first cavity 111 and the second cavity 121. The electrode assembly 200 is located in the first cavity 111. During multiple charge and discharge cycles of the battery cell 10, gas may be generated in the first cavity 111 due to side reactions of the electrochemical reaction. The gas will enter the air flow channel 130 and flow in the air flow channel 130. The shape, size, etc. of the airflow channel 130 can be set according to actual conditions. The end of the airflow channel 130 close to the second cavity 121 is located between the electrode assembly 200 and the second cavity 121. For example, when the electrode assembly 200 is placed in the shell 100, the electrode assembly 200 is supported on the bottom wall of the main body 110. In the height direction of the electrode assembly 200, one end of the airflow channel 130 is higher than the height of the electrode assembly 200, so that the end of the airflow channel 130 close to the second cavity 121 is located between the electrode assembly 200 and the second cavity 121. After the electrode assembly 200 expands, the electrode assembly 200 will not block all the airflow channels 130. The gas generated in the first cavity 111 can still enter the second cavity 121 through the airflow channel 130, and then be discharged from the second cavity 121 through the exhaust port 310 on the cover body 300.

[0061] Through the above embodiment, at least one end of the airflow channel 130 extends close to the second cavity 121, the electrode assembly 200 is located in the first cavity 111, and the end of the airflow channel 130 close to the second cavity 121 is located between the electrode assembly 200 and the second cavity 121, so that at least part of the airflow channel 130 and the electrode assembly 200 can be avoided, thereby improving the risk that the electrode assembly 200 deforms and blocks the airflow channel 130, resulting in the gas inside the first cavity 111 being unable to be discharged from the airflow channel 130 to the second cavity 121, and the wall thickness of the port portion 120 is greater than the wall thickness of the main body 110, thereby improving the stability of the cover body 300 covering the port portion 120, and alleviating the risk that the gas in the second cavity 121 cannot be discharged from the second cavity 121 from the exhaust port 310 of the cover body 300 in time, resulting in excessive air pressure in the second cavity 121 and damaging the battery cell 10.

[0062] Furthermore, the inner side wall of the port portion 120 is convex toward the inner side of the housing 100 relative to the inner side wall of the main body portion 110. Figure 4 As shown, the port portion 120 protrudes toward the inside of the housing 100 relative to the main body 110, and the outer sidewalls of the port portion 120 and the main body 110 can be on the same plane. For example, when the outer side surfaces of the port portion 120 and the main body 110 are cylindrical, the outer side surface of the port portion 120 and the outer side surface of the main body 110 can be on the same arc surface after being connected. Or when the outer side surfaces of the port portion 120 and the main body 110 are square cylindrical, the outer side surface of the port portion 120 and the corresponding outer side surface of the main body 110 can be on the same plane after being connected. As a result, the inner sidewall of the port portion 120 protrudes toward the inside of the housing 100 relative to the inner sidewall of the main body 110, which can reduce the diameter of the second cavity 121 of the port portion 120, reduce the overall volume of the housing 100, and improve the energy density of the battery cell 10.

[0063] Alternatively, the outer sidewall of the port portion 120 protrudes toward the inside of the housing 100 relative to the outer sidewall of the main body 110. In other embodiments, the port portion 120 protrudes toward the outside of the housing 100 relative to the main body 110, and the inner sidewalls of the port portion 120 and the main body 110 may be on the same plane. For example, when the inner side surfaces of the port portion 120 and the main body 110 are cylindrical, the inner side surfaces of the port portion 120 and the main body 110 may be connected to form the same arc surface, or when the inner side surfaces of the port portion 120 and the main body 110 are cylindrical, the inner side surfaces of the port portion 120 and the corresponding inner side surfaces of the main body 110 may be connected to form the same plane. The outer sidewall of the port portion 120 and the outer sidewall of the main body 110 may form a stepped form. Therefore, the outer wall of the port portion 120 protrudes toward the inner side of the shell 100 relative to the outer wall of the main body 110, which can reduce the connection stability between the cover body and the port portion by expanding the diameter of the second cavity of the port portion and reducing the accumulation of gas after entering the second cavity.

[0064] See also Figure 5 , Figure 5 is a second cross-sectional structural schematic diagram of a battery cell according to one or more embodiments.

[0065] The inner sidewall of the port portion 120 protrudes inward from the inner sidewall of the main body portion 110 toward the inside of the housing 100. The second cavity 121 includes a first cavity section 1211 and a second cavity section 1212 that are interconnected. The second cavity section 1212 is located between the first cavity section 1211 and the first cavity 111. The aperture of the first cavity section 1211 is smaller than that of the second cavity section 1212, and the aperture of the second cavity section 1212 gradually decreases from the first cavity 111 to the first cavity section 1211. The first cavity section 1211 can be straight cylindrical, and the second cavity section 1212 can be funnel-shaped, with the first cavity section 1211 closer to the opening of the housing 100. The aperture of the end of the second cavity section 1212 connected to the first cavity section 1211 can be greater than or equal to the aperture of the first cavity section 1211, and the aperture of the end of the second cavity section 1212 connected to the first cavity 111 can be smaller than or equal to the aperture of the first cavity 111. The shape of the connection between the second cavity segment 1212 and the first cavity 111 can match the shape of the connection between the first cavity 111 and the second cavity segment 1212, so that the second cavity segment 1212 can be directly connected to the airflow channel 130, and the aperture of the second cavity segment 1212 gradually decreases from the first cavity 111 to the first cavity segment 1211, so that the gas in the first cavity 111 can flow to the second cavity segment 1212 through the airflow channel 130, and then be guided to the first cavity segment 1211 along the side wall of the second cavity segment 1212, and then be discharged from the first cavity segment 1211 through the exhaust port 310 on the cover body 300, thereby improving the efficiency of gas flow and improving the risk of the connection between the port portion 120 and the main body portion 110 being impacted by a large airflow.

[0066] Furthermore, the distance D1 between the end of the port portion 120 away from the first cavity 111 and the end close to the first cavity 111 is between 5 mm and 10 mm. The end of the port portion 120 away from the first cavity 111 and the end close to the first cavity 111 can be understood as the two ends of the port portion 120 in the depth direction of the first cavity 111. Figure 4 As shown, the distance D1 between the end of the port portion 120 away from the first cavity 111 and the end close to the first cavity 111 can be understood as the size of the entire port portion 120 in the depth direction of the first cavity 111. Figure 5As shown, when the port portion 120 is formed with a first cavity segment 1211 and a second cavity segment 1212, the distance between the end of the port portion 120 away from the first cavity 111 and the end close to the first cavity 111 can also be understood as the dimension of the first cavity segment 1211 in the depth direction of the first cavity 111, or can be understood as the sum of the dimensions of the first cavity segment 1211 and the second cavity segment 1212 in the depth direction of the first cavity 111. The distance D1 between the end of the port portion 120 away from the first cavity 111 and the end close to the first cavity 111 can also be between 6 mm and 10 mm, between 7 mm and 9 mm, between 8 mm and 10 mm, between 6 mm and 9 mm, or between 6 mm and 8 mm, etc. Specifically, the distance D1 between the end of the port portion 120 away from the first cavity 111 and the end close to the first cavity 111 can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, or 10 mm. Thus, by properly setting the distance D1 between the end of the port portion 120 away from the first cavity 111 and the end close to the first cavity 111, the utilization rate of the internal space of the housing 100 affected by an excessively large distance can be improved. At the same time, the risk of damage to the electrode assembly 200 during the process of fixing the cover 300 and the housing 100 due to an excessively small distance causing the electrode assembly 200 to be too close to the cover 300 can be reduced.

[0067] In some embodiments, the distance D2 between the end of the airflow channel 130 near the second cavity 121 and the electrode assembly 200 is between 2 mm and 5 mm. For example, when the electrode assembly 200 is placed in the shell 100, the electrode assembly 200 is supported on the bottom wall of the main body 110. In the height direction of the electrode assembly 200, the distance D2 between the end of the airflow channel 130 near the second cavity 121 and the electrode assembly 200 can be obtained by one end of the airflow channel 130 being higher than the height of the electrode assembly 200. When the electrode assembly 200 expands, the electrode assembly 200 will not block all of the airflow channel 130. The gas generated in the first cavity 111 can still enter the second cavity 121 through the airflow channel 130, and then be discharged from the second cavity 121 through the exhaust port 310 on the cover 300. Among them, the distance D2 between the end of the air flow channel 130 close to the second cavity 121 and the electrode assembly 200 can also be between 2mm and 4mm, between 2mm and 3mm, between 2mm and 3.5mm, between 3mm and 4mm, or between 2.5mm and 3.5mm, etc. Specifically, the distance D2 between the end of the air flow channel 130 close to the second cavity 121 and the electrode assembly 200 can be 2mm, 2.5mm, 3mm, 3.5mm or 4mm, etc. Thus, by reasonably setting the distance between the end of the air flow channel 130 close to the second cavity 121 and the electrode assembly 200, the efficiency of the gas in the first cavity 111 being discharged to the second cavity 121 due to the small distance is improved, and at the same time, the utilization rate of the internal space of the shell 100 affected by the large distance can be improved.

[0068] In some embodiments, the wall thickness of the housing 100 is between 0.6 mm and 1 mm. The wall thickness of the housing 100 can be understood as the thickness of any side wall of the housing 100, for example, the side wall thickness at the port portion 120, or the side wall thickness at the main body 110. The wall thickness of the housing 100 can be between 0.6 mm and 0.9 mm, between 0.7 mm and 0.9 mm, between 0.7 mm and 1 mm, between 0.8 mm and 0.9 mm, between 0.6 mm and 0.8 mm, between 0.6 mm and 0.85 mm, and so on. Specifically, the wall thickness of the housing 100 can be 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 1 mm, and so on. Thus, by reasonably setting the wall thickness of the housing 100, it is possible to facilitate the opening of the airflow channel 130 on the housing 100 while improving the structural strength of the housing 100, thereby reducing the manufacturing difficulty of the housing 100.

[0069] In some embodiments, the difference between the wall thickness of the port portion 120 and the wall thickness of the main body 110 is between 0.2 mm and 0.3 mm. The difference between the wall thickness of the port portion 120 and the wall thickness of the main body 110 is between 0.2 mm and 0.275 mm, between 0.2 mm and 0.27 mm, between 0.25 mm and 0.275 mm, between 0.25 mm and 0.3 mm, between 0.225 mm and 0.275 mm, etc. Specifically, the difference between the wall thickness of the port portion 120 and the wall thickness of the main body 110 may include 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, 0.3 mm, etc. For example, if the wall thickness of the main body 110 is 0.6 mm, the wall thickness of the port portion 120 can be 0.8 mm to 0.9 mm. Alternatively, if the wall thickness of the main body 110 is 0.7 mm, the wall thickness of the port portion 120 can be 0.9 mm to 1 mm. Thus, by properly setting the difference between the wall thickness of the port portion 120 and the wall thickness of the main body 110, the stability of the cover 300 covering the port portion 120 can be improved, and the risk of excessive pressure in the second cavity 121 damaging the battery cell 10 due to the gas in the second cavity 121 not being able to be discharged from the second cavity 121 through the exhaust port 310 of the cover 300 can be reduced.

[0070] See also Figure 6 and Figure 7 , Figure 6 is a third cross-sectional structural schematic diagram of a battery cell according to one or more embodiments, Figure 7 is a fourth cross-sectional structural schematic diagram of a battery cell according to one or more embodiments.

[0071] The main body 110 has two first inner side walls 141 and two second inner side walls 142 arranged opposite to each other. The area of ​​the first inner side wall 141 is larger than the area of ​​the second inner side wall 142. The first inner side wall 141 is provided with an air flow channel 130, or both the first inner side wall 141 and the second inner side wall 142 are provided with an air flow channel 130. In this embodiment, the housing 100 can be in the shape of a square shell, and the interior of the first cavity 111 is correspondingly prismatic. For example, the first cavity 111 can be in the shape of a quadrangular prism. The two first inner side walls 141 are spaced apart from each other, and the two second inner side walls 142 are spaced apart from each other. One first inner side wall 141 connects the two second inner side walls 142, thereby enclosing the two first inner side walls 141 and the two second inner side walls 142 to form the first cavity 111. The area of ​​the first inner sidewall 141 is larger than the area of ​​the second inner sidewall 142. Accordingly, the shape of the electrode assembly 200 can match the shape of the first cavity 111. When the electrode assembly 200 is assembled into the first cavity 111, the large surface of the electrode assembly 200 can correspond to the first inner sidewall 141. Figure 6 As shown, the two opposite first inner side walls 141 are each provided with an air flow channel 130. By providing the air flow channel on the first inner side wall 141 with a larger surface area, the structural strength of the housing can be improved while reducing the difficulty of forming the air flow channel. Figure 7 As shown, when there is a need to exhaust from the second inner side wall 142, such as when a laminated electrode assembly 200 is assembled into the first cavity 111, air flow channels 130 can be opened on the two opposite first inner side walls 141 and the two opposite second inner side walls 142, thereby reducing the difficulty of forming the gas flow channel on the basis of improving the structural strength of the shell. At the same time, the air flow channel 130 is opened on the second inner side wall 142, which can further improve the gas exhaust efficiency.

[0072] See further Figure 6 and Figure 7 The airflow channel 130 includes a gas sub-channel 131, which extends from one end away from the second cavity 121 to the end close to the second cavity 121. The shape, size, etc. of the gas sub-channel 131 can be set according to actual conditions. For example, the gas sub-channel 131 can be a linear strip structure, or the gas sub-channel 131 can also be other curved shapes. For example, the gas sub-channel 131 can extend along the depth direction of the first cavity 111. One end of the gas sub-channel 131 extends to the side close to the second cavity 121, and the other end extends to the side of the bottom wall of the main body 110. The gas sub-channel 131 can extend continuously from one end to the other end, so that at least part of the gas on the side of the bottom wall of the main body 110 can be guided to the side of the second cavity 121 through the gas sub-channel 131, and the gas can be further efficiently discharged through the exhaust port 310 on the cover 300.

[0073] Furthermore, there are multiple gas sub-channels 131, and the multiple gas sub-channels 131 are arranged at intervals. The number of gas sub-channels 131 can be set according to actual conditions. For example, the number of gas sub-channels 131 can be proportional to the capacity of the battery cell 10. When the capacity of the battery cell 10 is large, the number of gas sub-channels 131 can be more, and when the capacity of the battery cell 10 is small, the number of gas sub-channels 131 can be fewer. The gas sub-channel 131 can be in the shape of an elongated strip, and each gas sub-channel 131 can be extended along the depth direction of the first cavity 111. The gas sub-channel 131 can be distributed throughout all or part of the inner wall of the shell 100. For example, a gas sub-channel 131 can be opened on the first inner wall 141, or a gas sub-channel 131 can be opened on the first inner wall 141 and the second inner wall 142 at the same time, so as to improve the efficiency of guiding the gas to the second cavity 121 by opening multiple gas sub-channels 131 at the same time, and further efficiently discharge the gas from the shell 100 through the exhaust port 310 on the cover body 300.

[0074] In some embodiments, the spacing between two adjacent gas sub-channels 131 is between 10 mm and 15 mm. The spacing between two adjacent gas sub-channels 131 on the same side may be between 10 mm and 15 mm, for example, the spacing between two adjacent gas sub-channels 131 located on the first inner sidewall 141 is between 10 mm and 15 mm, or the spacing between two adjacent gas sub-channels 131 located on the second inner sidewall 142 is between 10 mm and 15 mm. The spacing between two adjacent gas sub-channels 131 may be between 10 mm and 14 mm, between 11 mm and 14 mm, between 12 mm and 14 mm, between 12 mm and 15 mm, between 13 mm and 15 mm, or between 13 mm and 14 mm, etc. Specifically, the spacing between two adjacent gas sub-channels 131 may be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, etc. Therefore, by reasonably setting the distance between two adjacent gas sub-channels 131, the utilization rate of the internal space of the shell 100 is improved, so that sufficient gas sub-channels 131 can be arranged on the basis of taking into account the structural strength of the shell 100, thereby improving the gas discharge efficiency.

[0075] In some embodiments, the width of the gas sub-channel 131 is between 5 mm and 20 mm. The width of the gas sub-channel 131 can be understood as the size of the gas sub-channel 131 in the depth direction perpendicular to the first cavity 111 and the direction perpendicular to the side wall of the main body 110. The width of each gas sub-channel 131 is between 5 mm and 15 mm, between 7 mm and 20 mm, between 10 mm and 15 mm, between 10 mm and 20 mm, or between 7 mm and 10 mm, between 5 mm and 10 mm. Specifically, the width of each gas sub-channel 131 can be 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, 17 mm, 19 mm, or 20 mm. Therefore, by reasonably setting the width of the gas sub-channel 131, the risk of stress concentration at the corresponding position of the gas sub-channel 131 due to the small width of the gas sub-channel 131 can be alleviated, and the risk of reducing the overall structural strength of the shell due to the large width of the gas sub-channel 131 can be alleviated.

[0076] In some embodiments, the inner sidewall of the main body 110 is recessed to form a gas sub-channel 131, and the wall thickness of the main body 110 is 3 to 10 times the depth of the gas sub-channel 131. The depth of the gas sub-channel 131 can be understood as the depth of the gas sub-channel 131 extending along the wall thickness of a certain sidewall of the main body 110. The wall thickness of the housing 100 can be at a location corresponding to the gas sub-channel 131 or at a location where the gas sub-channel 131 is not provided. The wall thickness of the main body 110 can be 3 to 9 times the depth of the gas sub-channel 131, 3 to 8 times the wall thickness of the housing 100, 4 to 7 times the wall thickness of the housing 100, 5 to 9 times the wall thickness of the housing 100, 6 to 10 times the wall thickness of the housing 100, 3 to 5 times the wall thickness of the housing 100, and so on. Specifically, the wall thickness of the main body 110 is 3 times, 4 times, 5 times, 6 times, 7 times, 8 times, 9 times, or 10 times, etc., the depth of the gas sub-channel 131. Thus, the inner sidewall of the main body 110 is recessed to form the gas sub-channel 131. This not only reduces the manufacturing cost of the housing 100, but also mitigates the risk of low gas guiding efficiency due to the small depth of the gas sub-channel 131, and mitigates the risk of abnormal damage to the housing 100 due to the large depth of the gas sub-channel 131.

[0077] Specifically, the depth of the gas sub-channel 131 is between 0.1mm and 0.2mm. The depth of the gas sub-channel 131 can be between 0.15mm and 0.2mm, between 0.1mm and 0.15mm, between 0.11mm and 0.18mm, between 0.12mm and 0.17mm, between 0.13mm and 0.16mm, and so on. Specifically, the depth of the gas sub-channel 131 can be 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm or 0.2mm, and so on. Thus, by reasonably setting the depth of the gas sub-channel 131, the risk of low gas guiding efficiency due to the small depth of the gas sub-channel 131 can be alleviated, as well as the risk of abnormal damage to the shell 100 due to the large depth of the gas sub-channel 131 can be alleviated.

[0078] To sum up, at least one end of the airflow channel 130 extends close to the second cavity 121, the electrode assembly 200 is located in the first cavity 111, and the end of the airflow channel 130 close to the second cavity 121 is located between the electrode assembly 200 and the second cavity 121, so that at least part of the airflow channel 130 and the electrode assembly 200 can be avoided, thereby improving the risk that the electrode assembly 200 deforms and blocks the airflow channel 130, resulting in the gas inside the first cavity 111 being unable to be discharged from the airflow channel 130 to the second cavity 121, and the wall thickness of the port portion 120 is greater than the wall thickness of the main body 110, thereby improving the stability of the cover body 300 covering the port portion 120, and alleviating the risk that the gas in the second cavity 121 cannot be discharged from the second cavity 121 from the exhaust port 310 of the cover body 300 in time, resulting in excessive air pressure in the second cavity 121 and damaging the battery cell 10.

[0079] 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: The battery cell includes a housing, a cover, and an electrode assembly, the housing includes a main body and a port portion, the main body forming a first cavity, the port portion forming a second cavity, the main body and the port portion being connected to communicate with each other. In which, the wall thickness of the port part is greater than the wall thickness of the main body part, the cover body is covered on the port part, the cover body is provided with an exhaust port, the main body part is provided with an air flow channel, at least one end of the air flow channel extends to near the second cavity, the electrode assembly is located in the first cavity, and the end of the air flow channel close to the second cavity is located between the electrode assembly and the second cavity.

2. The battery cell according to claim 1, wherein: The inner side wall of the port portion protrudes toward the inner side of the shell relative to the inner side wall of the main body portion; Alternatively, the outer side wall of the port portion protrudes toward the inner side of the shell relative to the outer side wall of the main body portion.

3. The battery cell according to claim 1, wherein: The inner side wall of the port portion protrudes toward the inner side of the shell relative to the inner side wall of the main body portion, and the second cavity includes a first cavity segment and a second cavity segment that are interconnected. The second cavity segment is located between the first cavity segment and the first cavity, and the aperture of the first cavity segment is smaller than the aperture of the second cavity segment. The aperture of the second cavity segment gradually decreases along the direction from the first cavity to the first cavity segment.

4. The battery cell according to claim 1, wherein: The distance between the end of the port portion away from the first cavity and the end close to the first cavity is between 5 mm and 10 mm.

5. The battery cell according to claim 1, characterized in that The distance between one end of the air flow channel close to the second cavity and the electrode assembly is between 2 mm and 5 mm.

6. The battery cell according to claim 1, characterized in that The wall thickness of the shell is between 0.6 mm and 1 mm.

7. The battery cell according to claim 6, characterized in that The difference between the wall thickness of the port portion and the wall thickness of the main body portion is between 0.2 mm and 0.3 mm.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The gas flow channel includes a gas sub-flow channel, and the gas sub-flow channel extends from an end away from the second cavity to a end close to the second cavity.

9. The battery cell according to claim 8, characterized in that There are multiple gas sub-flow channels, and the multiple gas sub-flow channels are arranged at intervals.

10. The battery cell according to claim 9, characterized in that: The distance between two adjacent gas sub-channels is between 10 mm and 15 mm.

11. The battery cell according to claim 8, characterized in that The inner side wall of the main body is recessed to form the gas sub-channel, and the wall thickness of the main body is 3 to 10 times the depth of the gas sub-channel.

12. The battery cell according to claim 11, characterized in that The depth of the gas sub-channel is between 0.1 mm and 0.2 mm.

13. The battery cell according to claim 8, characterized in that The width of the gas sub-channel is between 5 mm and 20 mm.

14. The battery cell according to any one of claims 1 to 7, characterized in that: The main body has two first inner side walls and two second inner side walls that are opposite to each other, and the area of ​​the first inner side walls is larger than that of the second inner side walls; The first inner side wall is provided with the air flow channel, and / or both the first inner side wall and the second inner side wall are provided with the air flow channel.

15. A battery device, characterized in that: The battery device comprises the battery cell according to any one of claims 1 to 14.

16. An electrical device, characterized in that: The electrical device comprises the battery device as claimed in claim 15 .

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