Battery monomer, battery device, power utilization device and manufacturing method

Abstract

The invention discloses a battery monomer, a battery device, a power utilization device and a manufacturing method. The battery monomer comprises a shell and an electrode assembly, and the shell forms an accommodating space; the electrode assembly is arranged in the accommodating space, the electrode assembly comprises an electrode plate, the electrode plate comprises a main body region and a tab region, the tab region comprises a die-cutting tab and a full tab, the electrode plate is wound to enable the main body region to be wound to form a winding main body part of the electrode assembly, and the die-cutting tab is wound to form a flattening tab region of the electrode assembly; all tabs are wound to form a tabs flattening area of the electrode assembly, and the winding main body part is provided with a tabs flattening area and a tabs flattening area at the same time on at least one side in the axial direction of the electrode assembly. According to the electrode assembly, the risk that the probability of downward insertion or folding of the die-cut tabs is large due to the fact that the number of the die-cut tabs is too large is reduced, the risks of self-discharge and the like caused by the fact that the number of all tabs is too large and many particles are generated are reduced, meanwhile, gas generated in the electrode assembly can be exhausted through the tab flattening area, and the gas exhaust efficiency is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to sustainable development, which in turn promotes the adjustment of the 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 capability, high operating voltage, environmental friendliness, and low self-discharge, it has been widely used in portable electronics, electric vehicles, and energy storage systems.

[0003] Currently, in the production process of battery cells, it is usually necessary to flatten the tabs, especially full tabs. However, the flattened tabs form a dense tab end face, which makes it difficult for the gas generated inside the electrode assembly to escape during the charging and discharging process of the battery cell. This can easily lead to problems such as thermal runaway in the battery cell, resulting in poor reliability. Summary of the Invention

[0004] The main objective of this application is to provide a battery cell, a battery device, an electrical device, and a manufacturing method, aiming to solve the technical problems of low exhaust efficiency and poor reliability of battery cells in the prior art.

[0005] To address the aforementioned issues, this application provides a battery cell comprising a casing and an electrode assembly. The casing has an accommodating space. The electrode assembly is disposed within the accommodating space and includes an electrode sheet. The electrode sheet includes a main body region and a tab region. The tab region includes a die-cut tab and a full tab. The electrode sheet is wound to form a wound main body portion of the electrode assembly, the die-cut tab is wound to form a smoothed tab region of the electrode assembly, and the full tab is wound to form a flattened tab region of the electrode assembly. The wound main body portion has both a smoothed tab region and a flattened tab region on at least one side in the axial direction of the electrode assembly. Therefore, the electrode sheet is wound to form the wound body of the electrode assembly by winding the main body area, the die-cut tabs are wound to form the smoothed tab area, and the full tabs are wound to form the smoothed tab area of ​​the electrode assembly. Compared to electrode assemblies that are all smoothed by die-cut tabs, this reduces the risk of the die-cut tabs being inserted or folded due to an excessive number of die-cut tabs. Furthermore, compared to electrode assemblies that are all smoothed by full tabs, this reduces the risk of self-discharge caused by a large number of particles generated from the numerous full tabs. Additionally, the smoothed tab area also... This allows the gas generated inside the electrode assembly to be discharged through the smoothing tab area, improving the gas discharge efficiency inside the electrode assembly. In addition, the winding body has a smoothing tab area and a flattening tab area on at least one side in the axial direction. Compared with only a smoothing tab area or a flattening tab area on the same side, this can further reduce the risk of a high probability of die-cut tab insertion and / or folding caused by smoothing too many die-cut tabs, and further reduce the risk of self-discharge caused by a large number of particles generated by flattening too many full tabs.

[0006] In some embodiments, in the smoothing tab area and the flattening tab area on the same side of the winding body, the smoothing tab area is closer to the center of the winding body in the radial direction of the electrode assembly than the flattening tab area. Therefore, by placing the die-cut tab closer to the center of the winding body in the radial direction of the electrode assembly than the flattening tab area, the venting efficiency of the electrode assembly can be further improved.

[0007] In some embodiments, the ratio of the radial dimension of the smoothed tab area to the radial dimension of the winding body is greater than or equal to 5% and less than or equal to 40%. Therefore, by appropriately setting the ratio of the radial dimensions of the smoothed tab area to the winding body, the risk of excessive die-cut tabs being inserted and / or folded due to an excessively large proportion of the smoothed tab area can be mitigated. Simultaneously, the risk of self-discharge caused by excessive particles generated from the excessive smoothing of all tabs due to an excessively large proportion of the smoothed tab area can also be mitigated.

[0008] In some embodiments, in the smoothing tab area and the kneading tab area on the same side of the winding body, the kneading tab area is closer to the center of the winding body in the radial direction of the electrode assembly than the smoothing tab area. Therefore, by setting the kneading tab area closer to the center of the winding body in the radial direction of the electrode assembly than the smoothing tab area, it is easier to improve the gas discharge efficiency near the edge of the winding body, while reducing the molding difficulty of the electrode assembly.

[0009] In some embodiments, in the smoothing tab region and the flattening tab region on the same side of the winding body portion, the flattening tab region includes at least two sub-flattening regions spaced apart in the radial direction of the electrode assembly, and the smoothing tab region is located between the at least two sub-flattening regions in the radial direction of the electrode assembly. Therefore, by positioning the smoothing tab region between at least two sub-flattening regions in the radial direction of the electrode assembly, the number of full tabs flattened in each flattening tab region on the same side of the winding body portion can be reduced, further reducing the risk of self-discharge and other hazards caused by excessive full tab flattening resulting in more particles.

[0010] In some embodiments, in the smoothing tab area and the kneading tab area on the same side of the winding body portion, the smoothing tab area includes at least two sub-smoothing areas spaced apart in the radial direction of the electrode assembly, and the kneading tab area is located between the at least two sub-smoothing areas in the radial direction of the electrode assembly. Therefore, by positioning the kneading tab area between at least two sub-smoothing areas in the radial direction of the electrode assembly, the number of die-cut tabs in each smoothing tab area on the same side of the winding body portion can be reduced, further reducing the risk of a higher probability of die-cut tab insertion and / or folding due to an excessive number of die-cut tabs.

[0011] In some embodiments, the winding body portion has both smoothing tab areas and flattening tab areas on both sides of the electrode assembly in the axial direction. The smoothing tab areas on different sides correspond to each other in the axial direction of the electrode assembly, and the flattening tab areas on different sides correspond to each other in the axial direction of the electrode assembly. Therefore, having both smoothing tab areas and flattening tab areas on both sides of the winding body portion in the axial direction of the electrode assembly can further reduce the risk of increased probability of die-cut tab insertion and / or folding caused by smoothing too many die-cut tabs on each side of the winding body portion, as well as the risk of self-discharge caused by generating more particles from flattening too many full tabs. Furthermore, the correspondence between the smoothing tab areas on different sides and the flattening tab areas on different sides in the axial direction of the electrode assembly facilitates processing and shaping, and makes it easier for the smoothing tab areas on different sides of the winding body portion to cooperate in discharging gas from the corresponding areas of the winding body portion.

[0012] In some embodiments, the battery cell further includes a current collector located on the same side of the winding body where the smoothed tab area and the flattened tab area are provided. The current collector is fixed to both the smoothed tab area and the flattened tab area. Therefore, by fixing the current collector to both the smoothed tab area and the flattened tab area simultaneously, the contact area between the current collector and the tab area is increased, the connection stability between the current collector and the tab area is improved, the risk of overcurrent is reduced, and thus the reliability of the battery cell is improved.

[0013] In some embodiments, in the axial direction, the height of the smoothed tab region protruding from the winding body is lower than the height of the flattened tab region protruding from the winding body. The current collector includes a first current collector body and a second current collector body connected to each other. The first current collector body is connected to the smoothed tab region, and the second current collector body is connected to the flattened tab region. The first current collector body is closer to the winding body in the axial direction than the second current collector body. Therefore, by making the first current collector body closer to the winding body in the axial direction than the second current collector body, it is easier to match the shape of the current collector with the smoothed tab region and the flattened tab region, which helps to increase the contact area between the current collector and the tab region, improve the connection stability between the current collector and the tab region, reduce the risk of overcurrent, and thus improve the reliability of the battery cell.

[0014] In some embodiments, the current collector is provided with side vents that penetrate the opposite surfaces of the current collector in the axial direction, and the side vents correspond to the smoothed tab area. Thus, by aligning the side vents with the smoothed tab area, gas generated inside the electrode assembly can be discharged sequentially through the smoothed tab area and the side vents, thereby improving the gas discharge efficiency inside the electrode assembly and enhancing the reliability of the battery cell.

[0015] In some embodiments, the current collector has a central vent hole that extends axially through both opposite surfaces of the current collector. Side vent holes and the central vent hole are spaced apart. The electrode sheet winding body has a winding center hole extending axially, with the central vent hole corresponding to the winding center hole. Thus, by having the central vent hole and the winding center hole corresponding, gas generated inside the electrode assembly can be discharged sequentially through the winding center hole and the central vent hole, thereby improving the gas discharge efficiency inside the electrode assembly and enhancing the reliability of the battery cell.

[0016] In some embodiments, the radial dimension of the side vent is smaller than that of the center vent. Therefore, by appropriately setting the radial dimensions of the side and center vents, the gas discharge efficiency inside the electrode assembly can be improved, while reducing the risk of overcurrent due to insufficient contact area between the current collector and the tab area caused by an excessively large radial dimension of the side vent, thus improving the reliability of the battery cell.

[0017] In some embodiments, the proportion of die-cut tabs and tab areas is greater than 0 and less than or equal to 30%. Therefore, by reasonably setting the proportion of die-cut tab areas and tab areas, the molding difficulty of the tab areas can be reduced, thereby improving production efficiency. In some embodiments, the battery cell includes a pressure relief mechanism disposed in the housing. Therefore, gas inside the electrode assembly can be discharged from the housing through the pressure relief mechanism, thereby improving gas discharge efficiency and enhancing the reliability of the battery cell.

[0018] To address the aforementioned problems, this application also provides a battery device, which includes the aforementioned battery cell.

[0019] To address the aforementioned problems, this application also provides an electrical device, which includes the aforementioned battery device.

[0020] To address the aforementioned issues, this application also provides a method for manufacturing a battery cell. The method includes providing an electrode sheet, which includes a main body region and a tab region. The tab region includes a die-cut tab and a full tab. The method involves winding the electrode sheet such that the main body region is wound to form a wound main body portion, the die-cut tab is wound to form a smoothed tab region, and the full tab is wound to form a flattened tab region. The wound main body portion has both a smoothed tab region and a flattened tab region on at least one side of the electrode assembly in the axial direction. Therefore, the electrode sheet is wound to form the wound body of the electrode assembly by winding the main body area, the die-cut tabs are wound to form the smoothed tab area, and the full tabs are wound to form the smoothed tab area of ​​the electrode assembly. Compared to electrode assemblies that are all smoothed by die-cut tabs, this reduces the risk of the die-cut tabs being inserted or folded due to an excessive number of die-cut tabs. Furthermore, compared to electrode assemblies that are all smoothed by full tabs, this reduces the risk of self-discharge caused by a large number of particles generated from the numerous full tabs. Additionally, the smoothed tab area also... This allows the gas generated inside the electrode assembly to be discharged through the smoothing tab area, improving the gas discharge efficiency inside the electrode assembly. In addition, the winding body has a smoothing tab area and a flattening tab area on at least one side in the axial direction. Compared with only a smoothing tab area or a flattening tab area on the same side, this can further reduce the risk of a high probability of die-cut tab insertion and / or folding caused by smoothing too many die-cut tabs, and further reduce the risk of self-discharge caused by a large number of particles generated by flattening too many full tabs.

[0021] In some embodiments, the steps of winding the electrode sheet to form a wound main body portion by winding the main body region, winding the die-cut electrode tab to form a smoothed electrode tab region, and winding the full electrode tab to form a flattened electrode tab region include: winding the electrode sheet to form a wound main body portion by winding the main body region, winding the die-cut electrode tab to form a die-cut electrode tab winding region, and winding the full electrode tab to form a full electrode tab winding region; performing a smoothing operation on the die-cut electrode tab winding region by a smoothing mechanism to form a smoothed electrode tab region; and performing a flattening operation on the full electrode tab winding region by a flattening mechanism to form a flattened electrode tab region. Therefore, by first performing a smoothing operation on the die-cut electrode tab winding region by a smoothing mechanism to form a smoothed electrode tab region, and then performing a flattening operation on the full electrode tab winding region by a flattening mechanism to form a flattened electrode tab region, the impact of the flattening operation on the die-cut electrode tab winding region is reduced, while the forming difficulty of the smoothed electrode tab region and the flattened electrode tab region is reduced, which is beneficial to improving production efficiency.

[0022] In some embodiments, the step of performing a smoothing operation on the die-cut electrode tab winding area by a smoothing mechanism to form a smoothed electrode tab area includes: simultaneously forming the die-cut electrode tab winding area by winding the electrode sheet, and simultaneously performing a smoothing operation on the die-cut electrode tab winding area by a smoothing mechanism to form a smoothed electrode tab area. Therefore, performing a smoothing operation on the die-cut electrode tab winding area by a smoothing mechanism while simultaneously forming the die-cut electrode tab winding area by winding the electrode sheet helps to improve the forming speed of the electrode assembly and increase production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a vehicle according to one or more embodiments of this application;

[0025] Figure 2 This is an exploded structural diagram of a battery device according to one or more embodiments of this application; Figure 3 This is a schematic diagram of the structure of a battery cell according to one or more embodiments of this application; Figure 4 This is a first cross-sectional view of a battery cell according to one or more embodiments of this application; Figure 5 It is based on Figure 4 The diagram shows the structure of the electrode assembly of the battery cell before it is wound. Figure 6 This is a second cross-sectional view of a battery cell according to one or more embodiments of this application; Figure 7 It is based on Figure 6 The diagram shows the structure of the electrode assembly of the battery cell before it is wound. Figure 8 This is a schematic diagram of the current collector of a battery cell according to one or more embodiments of this application; Figure 9 This is a third cross-sectional view of a battery cell according to one or more embodiments of this application; Figure 10 This is a fourth cross-sectional view of a battery cell according to one or more embodiments of this application; Figure 11 This is a fifth cross-sectional view of a battery cell according to one or more embodiments of this application; Figure 12 This is a schematic flowchart illustrating a method for manufacturing a battery cell according to one or more embodiments of this application.

[0026] Reference numerals: Vehicle 1; Battery unit 2; Housing 200; First part 210; Second part 220; Accommodation space 230; Controller 3; Motor 4; Battery cell 100; Housing 10; Accommodation space 11; Electrode assembly 20; Electrode sheet 21; Main body area 22; Winding main body 221; Winding center hole 2211; Tab area 23; Die-cut tab 231; Smooth tab area 232; Sub-smooth area 2321; Full tab 233; Flattened tab area 234; Sub-flattened area 2341; Current collector 30; First current collector body 31; Second current collector body 32; Side vent 33; Middle vent 34; Pressure relief mechanism 40; Axial direction x1; Radial direction x2. Detailed Implementation

[0027] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0033] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0036] Currently, in the production process of battery cells, it is usually necessary to flatten the tabs, especially full tabs. However, the flattened tabs form a dense tab end face, which makes it difficult for the gas generated inside the electrode assembly to escape during the charging and discharging process of the battery cell. This can easily lead to problems such as thermal runaway in the battery cell, resulting in poor reliability.

[0037] Batteries, as discussed in this field, can be categorized into primary batteries and rechargeable batteries based on whether they are rechargeable. Primary batteries, also known as "use-and-discard" batteries or galvanic cells, cannot be recharged after their charge is depleted and must be discarded. Rechargeable batteries, also called secondary batteries or rechargeable batteries, differ from primary batteries in their manufacturing materials and processes. Their advantage lies in their ability to be cycled multiple times after charging, and their output current capacity is higher than most primary batteries. Common types of rechargeable batteries include lead-acid batteries, nickel-metal hydride batteries, and lithium-ion batteries. Lithium-ion batteries are lightweight, have a large capacity (1.5 to 2 times that of a nickel-metal hydride battery of the same weight), no memory effect, and a very low self-discharge rate, thus enjoying widespread use despite their relatively high price. Lithium-ion batteries are also widely used in pure electric vehicles and hybrid vehicles. While the capacity of lithium-ion batteries used in these applications is relatively lower, they offer a larger output and charging current, and a longer lifespan, but at a higher cost.

[0038] The batteries described in the embodiments of this application refer to rechargeable batteries or disposable batteries. The embodiments disclosed in this application will be described below primarily using lithium-ion batteries as an example. It should be understood that the embodiments disclosed in this application are applicable to any other suitable type of rechargeable battery. The batteries mentioned in the embodiments disclosed in this application can be directly or indirectly used in suitable devices to power those devices.

[0039] This application provides an electrical device, which may include, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys may include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc. The electrical device may include a battery device, which can provide electrical power to achieve the corresponding function.

[0040] Taking an electric vehicle as an example, an electric vehicle may include a battery device.

[0041] Please refer to Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments of this application.

[0042] Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, it can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 controls the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0043] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0044] To improve the performance of electrical devices, this application also provides a battery device, see [link to relevant documentation]. Figure 2 , Figure 2 This is an exploded structural diagram of a battery device according to one or more embodiments of this application.

[0045] The shape of the battery device 2 may include, but is not limited to, a square, cylindrical or other arbitrary shapes.

[0046] In some embodiments, the battery device 2 includes a housing 200 and a battery cell 100 disposed within the housing 200. The housing 200 provides a accommodating space 230 for the battery cell 100, and the housing 200 can adopt various structures. In some embodiments, the housing 200 may include a first portion 210 and a second portion 220, which overlap each other, and together define the accommodating space 230 for accommodating the battery cell. The second portion 220 may be a hollow structure with one end open, and the first portion 210 may be a plate-like structure, with the first portion 210 covering the open side of the second portion 220 so that the first portion 210 and the second portion 220 together define the accommodating space 230; the first portion 210 and the second portion 220 may also both be hollow structures with one side open, with the open side of the first portion 210 covering the open side of the second portion 220.

[0047] In the battery device 2, there can be multiple battery cells 100, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 100 is housed within the housing 200. Alternatively, the battery device 2 can also consist of multiple battery cells 100 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 200. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 100.

[0048] The manufacturing methods for battery cells 100 mainly include winding, meaning that battery cells 100 are primarily wound batteries. Wound batteries are simple to manufacture; the sheet-making and assembly processes generally do not require high precision from equipment, resulting in high production efficiency and low cost. In terms of performance, wound batteries possess excellent high and low temperature performance, very rapid charging, ultra-long lifespan, stable high output voltage, and a robust structure with strong shock resistance.

[0049] Combination Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of a battery cell according to one or more embodiments of this application; Figure 4 This is a first cross-sectional view of a battery cell according to one or more embodiments of this application.

[0050] The battery cell 100 includes a housing 10 and an electrode assembly 20. The housing 10 forms a receiving space 11. The electrode assembly 20 is disposed in the receiving space 11. The electrode assembly 20 includes an electrode sheet 21. The electrode sheet 21 includes a main body region 22 and a tab region 23. The tab region 23 includes a die-cut tab 231 and a full tab 233. The electrode sheet 21 is wound so that the main body region 22 is wound to form a wound main body portion 221 of the electrode assembly 20, the die-cut tab 231 is wound to form a smoothed tab region 232 of the electrode assembly 20, and the full tab 233 is wound to form a flattened tab region 234 of the electrode assembly 20.

[0051] Battery cell 100 refers to the smallest unit that makes up battery device 2. Electrode assembly 20 is the component in battery cell 100 where electrochemical reactions occur.

[0052] The outer casing 10 isolates the internal environment of the battery cell 100 from the external environment. The outer casing 10 possesses a certain degree of hardness and strength, making it less prone to deformation under pressure and impact, thus improving the safety performance of the battery cell 100. The outer casing 10 can be of any shape, including but not limited to square, cylindrical, and prismatic shapes. The outer casing 10 may have an internal hollow structure with an internal receiving space 11, which can be used to accommodate electrode components 20 and electrolytes. Exemplarily, the outer casing 10 may include a housing and an end cap. The end cap is a component that closes onto the opening of the housing to isolate the internal environment of the battery cell 100 from the external environment. Unrestricted, the shape of the end cap can be adapted to the shape of the housing to fit the housing. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as aluminum alloy), making it less prone to deformation under pressure and impact, thus enabling the battery cell 100 to have higher structural strength and improved safety performance. Functional components such as electrode terminals may be provided on the end cap. Electrode terminals can be used to electrically connect to electrode assembly 20 for outputting or inputting electrical energy into battery cell 100. In some embodiments, electrode terminals may include terminals. Terminals may include positive and negative terminals for current output and connection to external circuits. The end cap can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. The housing is a component used to fit the end cap to form the internal environment of battery cell 100, wherein the formed internal environment can be used to accommodate electrode assembly 20, electrolyte, and other components. The housing and end cap can be independent components, and an opening can be provided on the housing. The end cap closes the opening to form the internal environment of battery cell 100. Alternatively, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connecting surface before other components are inserted into the housing, and the end cap closes the housing when it is necessary to encapsulate the interior of the housing. The housing can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly 20. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0053] The housing 10 may contain one or more electrode assemblies 20. Each electrode assembly 20 includes electrode sheets 21. Exemplarily, the electrode sheets 21 may include an anode electrode and a cathode electrode. The electrode assembly 20 is primarily formed by winding the anode electrode, the cathode electrode, and a separator separating the anode and cathode electrodes. The portions of the anode and cathode electrodes containing active material constitute the main body of the electrode assembly 20, while the portions of the anode and cathode electrodes not containing active material each constitute a tab region 23. The anode tab and cathode tab may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the anode and cathode active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0054] The cathode electrode may include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector. As an example, the cathode current collector has two surfaces opposite each other in its thickness direction, and the cathode active material is disposed on either or both of the opposite surfaces of the cathode current collector. As an example, the cathode current collector may be a metal foil or a composite current collector. For example, as a metal foil, silver-treated aluminum or stainless steel, copper, nickel, carbon electrodes, carbon, or titanium may be used. The composite current collector may include a polymer base material and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The cathode active material may include, but is not limited to, lithium phosphates, lithium transition metal oxides, and their respective modified compounds.

[0055] The anode electrode may include an anode current collector and an anode active material disposed on at least one surface of the anode current collector. The anode current collector may be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it may be silver-treated aluminum or stainless steel, copper, nickel, carbon electrodes, carbon, or titanium. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, or foamed alloys. The composite current collector may include a polymeric material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymeric material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The negative electrode active material may include, but is not limited to, at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0056] The main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be, but is not limited to, a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0057] The electrode sheet 21 includes a main body region 22 and a tab region 23. The main body region 22 refers to the main portion of the electrode sheet 21 excluding the tab region 23. The tab region 23 includes a die-cut tab 231 and a full tab 233. The full tab 233 refers to the complete tab portion that has not undergone die-cutting, and the die-cut tab 231 refers to the tab portion formed after die-cutting the complete tab. Exemplarily, the electrode sheet 21 can be formed using a current collector as the main body. A portion of the current collector is coated with an active material film to form the main body region 22, while the current collector without the active material film is directly exposed to form an empty foil region. It is understood that the empty foil region can be used to form the tab region 23 during the processing of the electrode sheet 21. Specifically, a portion of the empty foil region can be removed by die-cutting, resulting in the remaining portion forming the die-cut tab 231, and the remaining portion without die-cutting forming the full tab 233. As an example, the die-cut tabs 231 can be die-cut by a die-cutting mechanism, wherein the die-cutting mechanism may include a tool assembly capable of contacting and cutting off a portion of the empty foil area, so that the remaining empty foil area forms a plurality of die-cut tabs 231 spaced apart.

[0058] The electrode sheet 21 is wound so that the main body area 22 is wound to form the wound main body 221 of the electrode assembly 20, the die-cut electrode tab 231 is wound to form the smoothed electrode tab area 232 of the electrode assembly 20, and the full electrode tab 233 is wound to form the flattened electrode tab area 234 of the electrode assembly 20. The die-cut tab 231 can be smoothed by a smoothing mechanism to form a smoothed tab area 232, and the full tab 233 can be smoothed by a kneading mechanism to form a kneaded tab area 234. It should be noted that the smoothed tab area 232 is formed by arranging, guiding or pressing the die-cut tab 231, and there are gaps between adjacent winding layers. Gas generated inside the winding body 221 can be discharged through the gaps. The kneaded tab area 234 is formed by high-pressure rolling to plastically deform the full tab 233, thereby forming a dense and flat end face. It can be understood that the kneaded tab area 234 after the full tab 233 is smoothed forms a dense tab end face, making it difficult for gas generated inside the electrode assembly 20 to be discharged during the charging and discharging process of the battery cell 100. By smoothing the tab area 232 and kneading the tab area 234 in cooperation, the gas generated inside the electrode assembly 20 can be discharged through the smoothing tab area 232, thereby improving the gas removal efficiency inside the electrode assembly 20. At the same time, it can reduce the risk of excessive particles generated by the full tab 233 due to the excessive size of the kneading tab area 234, thus improving the reliability of the battery cell 100.

[0059] Through the above embodiments, the electrode sheet 21 is wound to form the wound main body 221 of the electrode assembly 20 by winding the main body area 22, the die-cut tab 231 is wound to form the smoothed tab area 232, and the full tab 233 is wound to form the flattened tab area 234 of the electrode assembly 20. Compared with the electrode assembly 20 which is entirely smoothed by die-cut tab 231, the risk of the die-cut tab 231 being inserted or folded down due to the large number of die-cut tabs 231 can be reduced. Compared with the electrode assembly 20 which is entirely flattened by full tab 233, the risk of self-discharge caused by the large number of particles generated by the full tab 233 can be reduced. At the same time, the smoothed tab area 232 can also allow the gas generated inside the electrode assembly 20 to be discharged through the smoothed tab area 232, thereby improving the gas discharge efficiency inside the electrode assembly 20.

[0060] In some embodiments, the winding body portion 221 has both a smoothing tab region 232 and a kneading tab region 234 on at least one side of the electrode assembly 20 in the axial direction x1. It should be noted that the winding body portion 221 may have both a smoothing tab region 232 and a kneading tab region 234 on one side of the electrode assembly 20 in the axial direction x1, while the other side may only have a smoothing tab region 232 or only a kneading tab region 234. Alternatively, the winding body portion 221 may have both a smoothing tab region 232 and a kneading tab region 234 on both sides in the axial direction x1. Specifically, in the axial direction x1, two smoothing tab regions 232 on different sides may be correspondingly arranged, two kneading tab regions 234 on different sides may also be correspondingly arranged, or one smoothing tab region 232 and one kneading tab region 234 on different sides may also be correspondingly arranged.

[0061] It should be noted that, in the axial direction x1 of the electrode assembly 20, the electrode terminals of the battery cell 100 can be disposed on both sides of the housing 10 or on the same side of the housing 10. For example, the electrode terminals may include a positive terminal and a negative terminal. In some applications, the positive terminal may be disposed on one side of the housing 10, and the negative terminal may be disposed on the other side of the housing 10. Specifically, the side of the winding body portion 221 near the positive terminal may simultaneously have a smoothing tab area 232 and a flattening tab area 234, and the side of the winding body portion 221 near the negative terminal may also have... The casing 10 has a smoothing tab area 232 and a flattening tab area 234; or the winding body 221 has both a smoothing tab area 232 and a flattening tab area 234 on the side near the positive electrode post, and only one of the smoothing tab area 232 and the flattening tab area 234 is provided on the side near the negative electrode post; or the winding body 221 has both a smoothing tab area 232 and a flattening tab area 234 on the side near the negative electrode post, and only one of the smoothing tab area 232 and the flattening tab area 234 is provided on the side near the positive electrode post. In some applications, the positive and negative electrodes are located on the same side of the casing 10, and the winding body 221 has both a smoothing tab area 232 and a flattening tab area 234 on the side near both the positive and negative electrodes.

[0062] Therefore, the winding body portion 221 has a smoothing tab area 232 and a flattening tab area 234 on at least one side in the axial direction x1. Compared with only smoothing tab area 232 or flattening tab area 234 on the same side, it can further reduce the risk of the die-cut tabs 231 being inserted and / or folded due to the smoothing of too many die-cut tabs 231, and further reduce the risk of self-discharge caused by the large number of particles generated by the flattening of too many full tabs 233.

[0063] In some embodiments, the electrode assembly 20 battery cell 100 includes a pressure relief mechanism 40 disposed on the housing 10. Exemplarily, the housing 10 may include a wall portion, which refers to any one of the wall surfaces of the housing 10. Taking a cylindrical shape as an example, the wall portion can be either one of the two ends of the cylinder or a sidewall of the cylinder. The pressure relief mechanism 40 is fixedly mounted on the wall portion; for example, the pressure relief mechanism 40 can be welded to the surface of the wall portion facing the interior of the housing 10. Specifically, the pressure relief mechanism 40 may completely cover the pressure relief hole in a direction perpendicular to the wall surface, or the venting membrane of the pressure relief mechanism 40 may completely cover the pressure relief hole in a direction perpendicular to the wall surface. The pressure relief mechanism 40 may also be referred to as a pressure relief valve, and it can be used to release internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. As an example, the internal pressure or temperature of the battery cell 100 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 100 reaches a predetermined threshold, the pressure relief mechanism 40 actuates or a weak structure provided in the pressure relief mechanism 40 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. This threshold design varies depending on design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 100. As an example, the pressure relief mechanism 40 can be integrally formed with the housing 10; for example, grooves are made on the housing 10 to form a weak structure, which serves as the pressure relief mechanism 40. Alternatively, the pressure relief mechanism 40 can be separately provided and connected to the housing 10; for example, the pressure relief mechanism 40 is welded to the housing 10 or connected via other components. As an example, grooves are provided on the pressure relief mechanism 40 to form a weak structure. As an example, the pressure relief mechanism 40 can take the form of an explosion-proof valve, a balance valve, a gas valve, a pressure relief valve, or a safety valve.

[0064] The term "actuation" as used in this application refers to the pressure relief mechanism 40 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 100. The actions of the pressure relief mechanism 40 may include, but are not limited to: movement of components within the pressure relief mechanism 40 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 40, etc. When the pressure relief mechanism 40 is activated, the high-temperature, high-pressure substances inside the battery cell 100 are discharged outwards from the activated portion as emissions. This method allows for pressure and temperature relief of the battery cell 100 under controllable pressure or temperature, thereby reducing the risk of more serious accidents. The emissions from the battery cell 100 mentioned in this application include, but are not limited to: electrolyte, dissolved or broken positive and negative electrode plates, fragments of the separator, high-temperature, high-pressure gases generated during the reaction, flames, etc. In some applications, the pressure relief mechanism 40 can be configured corresponding to the winding center hole 2211 of the winding body 221, thereby facilitating the discharge of gas inside the electrode assembly 20 through the winding center hole 2211 and the pressure relief mechanism 40 into the battery cell 100. This allows the gas inside the electrode assembly 20 to be discharged into the housing 10 via the pressure relief mechanism 40, improving gas discharge efficiency and enhancing the reliability of the battery cell 100. In some applications, the pressure relief mechanism 40 is configured corresponding to the flattened tab area 232 in the axial direction of the electrode assembly 20.

[0065] Combination Figure 4 and Figure 5 , Figure 5 It is based on Figure 4 The diagram shows the structure of the electrode assembly of the battery cell before it is wound.

[0066] In some embodiments, in the smoothing tab area 232 and the flattening tab area 234 on the same side of the winding body portion 221, the smoothing tab area 232 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the flattening tab area 234. Exemplarily, the electrode sheet 21 can be divided into a first segment and a second segment before winding, with the tab area 23 of the first segment being a die-cut tab 231 and the tab area 23 of the second segment being a full tab 233. During the winding process of the electrode sheet 21, winding can begin from the first segment, thereby making the die-cut tab 231 of the first segment closer to the center of the winding body portion 221. It is understood that gas is more easily discharged from the smoothing tab area 232, thereby making it easier for gas inside the electrode assembly 20 to be discharged from a position closer to the center of the winding body portion 221. In some applications, both sides of the winding main body 221 are provided with a smoothing tab area 232 and a flattening tab area 234. The smoothing tab area 232 on each side is closer to the center of the winding main body 221 in the radial direction x2 of the electrode assembly 20 than the flattening tab area 234 on the same side. The areas of the smoothing tab areas 232 and the flattening tab areas 234 on both sides can be the same or different. Therefore, by placing the smoothing tab area 232 closer to the center of the winding main body 221 in the radial direction x2 of the electrode assembly 20 than the flattening tab area 234, the die-cut tab 231 is positioned where the venting demand of the electrode assembly 20 is greater, which can further improve the venting efficiency of the electrode assembly 20.

[0067] In some embodiments, the ratio of the radial dimension of the smoothing tab region 232 in the radial direction x2 to the radial dimension of the winding body portion 221 in the radial direction x2 is greater than or equal to 5% and less than or equal to 40%. Exemplarily, the ratio of the radial dimension of the smoothing tab region 232 in the radial direction x2 to the radial dimension of the winding body portion 221 in the radial direction x2 can be greater than or equal to 5% and less than or equal to 10%, or greater than or equal to 15% and less than or equal to 30%, or greater than or equal to 20% and less than or equal to 40%, etc. Specifically, the ratio of the radial dimension of the smoothing tab region 232 in the radial direction x2 to the radial dimension of the winding body portion 221 in the radial direction x2 can be, but is not limited to, 5%, 10%, 15%, 26%, 30%, 35%, or 40%, etc. It should be noted that if the proportion of the smoothed tab area 232 is too large, the risk of the tab area 23 folding over is relatively high. If the proportion of the kneaded tab area 234 is too large, the risk of excessive particles generated by the full tab 233 is relatively high, leading to a greater risk of self-discharge. Therefore, by reasonably setting the ratio of the smoothed tab area 232 to the radial dimension of the winding body 221, the risk of excessive die-cut tabs 231 being smoothed and inserted downwards and / or folded over due to the excessive proportion of the smoothed tab area 232 can be mitigated. At the same time, the risk of self-discharge caused by excessive particles generated by the kneading of too many full tabs 233 due to the excessive proportion of the kneaded tab area 234 can also be mitigated.

[0068] Combination Figures 6-7 , Figure 6 This is a second cross-sectional view of a battery cell according to one or more embodiments of this application; Figure 7 It is based on Figure 6 The diagram shows the structure of the electrode assembly of the battery cell before it is wound.

[0069] In some embodiments, in the smoothing tab area 232 and the flattening tab area 234 on the same side of the winding body portion 221, the flattening tab area 234 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the smoothing tab area 232. Exemplarily, the electrode sheet 21 can be divided into a first segment and a second segment before winding. The tab area 23 of the first segment is a die-cut tab 231, and the tab area 23 of the second segment is a full tab 233. During the winding process of the electrode sheet 21, winding can begin from the second segment, thereby making the full tab 233 of the second segment closer to the center of the winding body portion 221. It is understood that gas is more easily discharged from the smoothing tab area 232, thereby making it easier for gas inside the electrode assembly 20 to be discharged from a position near the edge of the winding body portion 221. In some applications, both sides of the winding main body 221 are provided with a smoothing tab area 232 and a kneading tab area 234. The kneading tab area 234 on each side is closer to the center of the winding main body 221 in the radial direction x2 of the electrode assembly 20 than the smoothing tab area 232 on the same side. The areas of the smoothing tab areas 232 on both sides can be the same or different, and the areas of the kneading tab areas 234 on both sides can also be the same or different. Therefore, by setting the kneading tab area 234 closer to the center of the winding main body 221 in the radial direction x2 of the electrode assembly 20 than the smoothing tab area 232, the gas discharge efficiency near the edge of the winding main body 221 is improved, while the molding difficulty of the electrode assembly 20 is reduced.

[0070] Combination Figure 4 and Figure 6 In some embodiments, the battery cell 100 further includes a current collector 30, which is located on the same side of the winding body 221 where the flattened tab area 232 and the kneaded tab area 234 are provided. The current collector 30 is fixed to both the flattened tab area 232 and the kneaded tab area 234. The current collector 30 is a key conductive component connecting the cell tab and the terminal post, and can be used to efficiently collect current and conduct it to the external circuit. For example, when a smoothing tab area 232 and a kneading tab area 234 are provided on one side of the winding main body 221, the current collector 30 can be fixed to both the smoothing tab area 232 and the kneading tab area 234 simultaneously, thereby achieving electrical connection with the smoothing tab area 232 and the kneading tab area 234. When both sides of the winding main body 221 are provided with smoothing tab areas 232 and kneading tab areas 234, there can be two current collectors 30. The two current collectors 30 are respectively provided on both sides of the winding main body 221, and each current collector 30 is fixed to the smoothing tab area 232 and the kneading tab area 234 on the same side simultaneously. Therefore, by fixing the current collector 30 to both the flattened tab area 232 and the smoothed tab area 234, it is beneficial to increase the contact area between the current collector 30 and the tab area 23, improve the connection stability between the current collector 30 and the tab area 23, reduce the risk of overcurrent, and thus improve the reliability of the battery cell 100.

[0071] In some embodiments, in the axial direction x1, the height of the smoothed tab region 232 protruding from the winding body portion 221 is lower than the height of the flattened tab region 234 protruding from the winding body portion 221. The collector plate 30 includes a first collector body 31 and a second collector body 32 connected to each other. The first collector body 31 is connected to the smoothed tab region 232, and the second collector body 32 is connected to the flattened tab region 234. The first collector body 31 is closer to the winding body portion 221 in the axial direction x1 than the second collector body 32. It is understandable that, due to the different forming methods of the smoothing tab area 232 and the flattening tab area 234, in the axial direction x1, the height of the smoothing tab area 232 protruding from the winding body 221 is lower than the height of the flattening tab area 234 protruding from the winding body 221. Therefore, by setting the first current collector 31 closer to the winding body 221 relative to the second current collector 32 in the axial direction x1, it is easier for the first current collector 31 to connect better with the smoothing tab area 232, and for the second current collector 32 to connect better with the flattening tab area 234, thereby improving the connection stability between the current collector plate 30 and the tab area 23. For example, when the flattened tab area 232 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the flattened tab area 234, and the first current collector 31 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the second current collector 31, the current collector disk 30 is generally concave in shape; when the flattened tab area 234 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the flattened tab area 232, and the second current collector 32 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the first current collector 31, the current collector disk 30 is generally convex in shape. Therefore, by placing the first current collector 31 closer to the winding body 221 in the axial direction x1 than the second current collector 32, it is easier to match the shape of the current collector 30 with the flattened tab area 232 and the smoothed tab area 234. This helps to increase the contact area between the current collector 30 and the tab area 23, improve the connection stability between the current collector 30 and the tab area 23, reduce the risk of overcurrent, and thus improve the reliability of the battery cell 100.

[0072] Combination Figure 8 , Figure 8 This is a schematic diagram of the current collector of a battery cell according to one or more embodiments of this application.

[0073] In some embodiments, the collector plate 30 is provided with edge vents 33, which penetrate the opposite side surfaces of the collector plate 30 in the axial direction x1, and correspond to the flattened tab area 232. Exemplarily, the flattened tab area 234 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 relative to the flattened tab area 232, so that the flattened tab area 232 is located at the edge of the winding body portion 221 in the radial direction x2, and the edge vents 33 correspond to the flattened tab area 232, thereby facilitating the discharge of gas inside the electrode assembly 20 through the flattened tab area 232 and the edge vents 33 in sequence. The number of edge vents 33 can be one, two, or more. When there are multiple edge vents 33, they can be spaced apart. The shape of the edge vents 33 can be any shape, including but not limited to circles, squares, etc. Therefore, by setting the side vent 33 and the smoothed tab area 232 together, the gas generated inside the electrode assembly 20 can be discharged sequentially through the smoothed tab area 232 and the side vent 33, thereby improving the gas discharge efficiency inside the electrode assembly 20 and improving the reliability of the battery cell 100.

[0074] In some embodiments, the collector plate 30 is provided with a central vent 34, which penetrates the opposite surfaces of the collector plate 30 in the axial direction x1. The side vents 33 and the central vent 34 are spaced apart. The electrode sheet 21 winding body 221 is provided with a winding center hole 2211 extending in the axial direction x1. The central vent 34 and the winding center hole 2211 correspond to each other. It should be noted that in the process of winding to form the electrode assembly 20, a winding needle can be set first, and then the anode electrode sheet, cathode electrode sheet and diaphragm can be wound on the winding needle simultaneously until the electrode assembly 20 is formed. The position of the electrode assembly 20 corresponding to the winding needle is formed as the winding center hole 2211 inside the electrode assembly 20. The winding center hole 2211 is a through hole extending along the central axis of the electrode assembly 20. A central vent 34 is located in the center of the current collector 30. For example, assuming the current collector 30 is circular, the central vent 34 can cover the center of the current collector 30. It is understood that the central vent 34 and the winding center hole 2211 are correspondingly arranged, allowing gas generated inside the electrode assembly 20 to be discharged sequentially through the winding center hole and the central vent 34. Therefore, by correspondingly arranging the central vent 34 and the winding center hole 2211, gas generated inside the electrode assembly 20 can be discharged sequentially through the winding center hole 2211 and the central vent 34, thereby improving the gas discharge efficiency inside the electrode assembly 20 and enhancing the reliability of the battery cell 100.

[0075] In some embodiments, the radial dimension of the edge vent 33 is smaller than the radial dimension of the center vent 34. Exemplarily, there can be multiple edge vents 33, and the radial dimensions of these multiple edge vents 33 can be the same or different, wherein the radial dimension of the largest edge vent 33 is smaller than the radial dimension of the center vent 34. Therefore, by reasonably setting the radial dimensions of the edge vents 33 and the center vent 34, the gas discharge efficiency inside the electrode assembly 20 can be improved, while reducing the risk of overcurrent due to an excessively large radial dimension of the edge vent 33 causing an insufficient contact area between the current collector 30 and the tab region 23, thus improving the reliability of the battery cell 100.

[0076] Furthermore, in some embodiments, the battery cell 100 also includes a pressure relief mechanism 40. In the flattened tab area 232 and the kneaded tab area 234 on the same side of the winding body 221, the flattened tab area 232 is closer to the center of the winding body 221 in the radial direction x2 of the electrode assembly 20 than the kneaded tab area 234. The collector plate 30 is also provided with a central vent hole 34. The winding center hole 2211, the central vent hole 34 and the pressure relief mechanism 40 are correspondingly arranged in the axial direction x1, thereby facilitating the convergence and discharge of gas inside the electrode assembly 20 to the center of the battery cell 100, and improving the exhaust efficiency of the battery cell 100.

[0077] Combination Figure 9 , Figure 9 This is a third cross-sectional view of a battery cell according to one or more embodiments of this application.

[0078] In some embodiments, in the flattening tab region 232 and the kneading tab region 234 on the same side of the winding body portion 221, the kneading tab region 234 includes at least two sub-kneading regions 2341 spaced apart in the radial direction x2 of the electrode assembly 20, and the flattening tab region 232 is located between the at least two sub-kneading regions 2341 in the radial direction x2 of the electrode assembly 20. For example, taking two sub-kneading regions 2341 and one flattening tab region 232 as an example, one sub-kneading region 2341 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 relative to the flattening tab region 232, and the other sub-kneading region 2341 is closer to the edge of the winding body portion 221 in the radial direction x2 of the flattening tab region 232, with the flattening tab region 232 located between the two sub-kneading regions 2341. Understandably, gas is more easily discharged from the smoothed tab region 232, thus making it easier for gas inside the electrode assembly 20 to be discharged from the position between the two sub-smoothing regions 2341. In some applications, the smoothed tab region 232 also includes at least two sub-smoothing regions 2321 spaced apart in the radial direction x2, each sub-smoothing region 2321 located between at least two sub-smoothing regions 2341 in the radial direction x2. Specifically, the dimensions of each sub-smoothing region 2341 in the radial direction x2 can be the same or different. Thus, by positioning the smoothed tab region 232 between at least two sub-smoothing regions 2341 in the radial direction x2 of the electrode assembly 20, the number of full tabs 233 smoothed in each smoothed tab region 234 on the same side of the winding body portion 221 can be reduced, further reducing the risk of self-discharge caused by excessive particles generated from smoothing too many full tabs 233.

[0079] Combination Figure 10 , Figure 10 This is a fourth cross-sectional view of a battery cell according to one or more embodiments of this application; In some embodiments, in the smoothing tab region 232 and the flattening tab region 234 on the same side of the winding body portion 221, the smoothing tab region 232 includes at least two sub-smoothing regions 2321 spaced apart in the radial direction x2 of the electrode assembly 20, and the flattening tab region 234 is located between the at least two sub-smoothing regions 2321 in the radial direction x2 of the electrode assembly 20. For example, taking two sub-smoothing regions 2321 and one flattening tab region 234 as an example, one sub-smoothing region 2321 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 relative to the flattening tab region 234, and the other sub-smoothing region 2321 is closer to the edge of the winding body portion 221 in the radial direction x2 of the flattening tab region 234, with the flattening tab region 234 located between the two sub-smoothing regions 2321. Understandably, gas is more easily discharged from the smoothed tab region 232, thus making it easier for gas inside the electrode assembly 20 to be discharged from the positions on both sides of the smoothed tab region 234. In some applications, the smoothed tab region 234 also includes at least two sub-smoothing regions 2341 spaced apart in the radial direction x2, each sub-smoothing region 2341 located between at least two sub-smoothing regions 2321 in the radial direction x2. Specifically, the dimensions of each sub-smoothing region 2321 in the radial direction x2 can be the same or different. Thus, by positioning the smoothed tab region 234 between at least two sub-smoothing regions 2321 in the radial direction x2 of the electrode assembly 20, the number of die-cut tabs 231 in each smoothed tab region 232 on the same side of the winding body portion 221 can be reduced, further reducing the risk of a higher probability of die-cut tabs 231 insertion and / or folding due to an excessive number of die-cut tabs 231.

[0080] In some embodiments, the winding body portion 221 is provided with a smoothing tab area 232 and a kneading tab area 234 on both sides of the electrode assembly 20 in the axial direction x1. The smoothing tab areas 232 on different sides correspond to each other in the axial direction x1 of the electrode assembly 20, and the kneading tab areas 234 on different sides correspond to each other in the axial direction x1 of the electrode assembly 20. For example, when one side of the smoothing tab area 232 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 relative to the flattening tab area 234, the other side of the smoothing tab area 232 is also closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 relative to the flattening tab area 234; when one side of the flattening tab area 234 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 relative to the smoothing tab area 232, the other side of the flattening tab area 234 is also closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 relative to the smoothing tab area 232; when one side of the flattening tab area 234 includes at least two sub-flattening areas 2341 spaced apart in the radial direction x2 of the electrode assembly 20, the smoothing tab area 232 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20. The flattened tab region 234 on one side is located between at least two sub-flattened regions 2341 in the radial direction x2 of the electrode assembly 20, and its flattened tab region 232 is also located between at least two sub-flattened regions 2341 in the radial direction x2 of the electrode assembly 20; when one side of the flattened tab region 232 includes at least two sub-flattened regions 2321 in the radial direction x2 of the electrode assembly 20, and the flattened tab region 234 is located between at least two sub-flattened regions 2321 in the radial direction x2 of the electrode assembly 20, and the flattened tab region 232 on the other side also includes at least two sub-flattened regions 2321 in the radial direction x2 of the electrode assembly 20, and its flattened tab region 234 is also located between at least two sub-flattened regions 2321 in the radial direction x2 of the electrode assembly 20. Therefore, the winding body 221 is provided with a smoothing tab area 232 and a flattening tab area 234 on both sides of the electrode assembly 20 in the axial direction x1. This can further reduce the risk of the die-cut tabs 231 being inserted and / or folded down due to the smoothing of too many die-cut tabs 231 on each side of the winding body 221, as well as the risk of self-discharge caused by the large number of particles generated by the flattening of too many full tabs 233. At the same time, the smoothing tab areas 232 on different sides correspond to each other in the axial direction x1 of the electrode assembly 20, and the flattening tab areas 234 on different sides correspond to each other in the axial direction x1 of the electrode assembly 20, which is more conducive to processing and forming, and facilitates the smoothing tab areas 232 on different sides of the winding body 221 to cooperate with each other to discharge the gas in the corresponding area of ​​the winding body 221.

[0081] Combination Figure 11 , Figure 11 This is a fifth cross-sectional view of a battery cell according to one or more embodiments of this application; In some embodiments, the winding body portion 221 has a smoothing tab region 232 on one side and a flattening tab region 234 on the other side in the axial direction x1 of the electrode assembly 20. Exemplarily, the electrode terminals may include a positive electrode post and a negative electrode post. The positive electrode post may be disposed on one side of the housing 10, and the negative electrode post may be disposed on the other side of the housing 10. The smoothing tab region 232 may be disposed on the side of the winding body portion 221 near the positive electrode post, and the flattening tab region 234 may be disposed on the side of the winding body portion 221 near the negative electrode post; alternatively, the smoothing tab region 232 may be disposed on the side of the winding body portion 221 near the negative electrode post, and the flattening tab region 234 may be disposed on the side of the winding body portion 221 near the positive electrode post. In some other embodiments, the battery cell 100 further includes a current collector 30, which can be fixed to at least one of the flattened tab region 232 and the smoothed tab region 234. Exemplarily, there can be two current collectors 30, disposed on opposite sides of the winding body portion 221 in the axial direction x1. One current collector 30 is fixed to the smoothed tab region 234, and the other current collector 30 is fixed to the flattened tab region 232. Thus, by providing a flattened tab region 232 on one side of the winding body portion 221 in the axial direction x1 and a smoothed tab region 234 on the other side, the risk of tab folding and / or insertion is reduced by the smoothed tab region 234 on one side, improving the welding stability of the tab region 23. Simultaneously, it facilitates the discharge of gas inside the electrode assembly 20 through the side with the flattened tab region 232, improving gas discharge efficiency and thereby enhancing the reliability of the battery cell 100.

[0082] In some embodiments, the proportion of die-cut tabs 231 and tab regions 23 is greater than 0 and less than or equal to 30%. Exemplarily, the proportion of die-cut tabs 231 and tab regions 23 can be greater than 0 and less than or equal to 10%, or greater than or equal to 10% and less than or equal to 15%, or greater than or equal to 20% and less than or equal to 30%, etc. Specifically, the proportion of die-cut tabs 231 and tab regions 23 can be, but is not limited to, 5%, 8%, 10%, 15%, 16%, 20%, 25%, or 30%, etc. Therefore, by reasonably setting the proportion of die-cut tab regions 231 and 23, the molding difficulty of tab regions 23 can be reduced, thereby improving production efficiency. Furthermore, by reasonably setting the proportion of die-cut tabs 231 and tab regions 23, it is also possible to avoid increasing the size of the winding center hole 2211, reducing the risk of collapse of the winding center hole 2211 due to its excessive size.

[0083] Combination Figure 12 , Figure 12This is a schematic flowchart illustrating a method for manufacturing a battery cell according to one or more embodiments of this application.

[0084] To address the aforementioned problems, this application also provides a method for manufacturing the aforementioned battery cell.

[0085] The manufacturing method provided in this application includes the following steps: Step S110: Provide an electrode sheet, which includes a main body area and a tab area, and the tab area includes a die-cut tab and a full tab.

[0086] Specifically, the electrode sheet 21 can be formed primarily of a current collector, with a portion of the current collector coated with an active material film to form the main body region 22, and the current collector without the active material film coating directly exposed to form an empty foil region. It is understood that the empty foil region can be processed to form the tab region 23. Exemplarily, a portion of the empty foil region can be removed by die-cutting, resulting in the remaining portion forming a die-cut tab 231, and the remaining portion of the empty foil region that has not undergone die-cutting forming a full tab 233, thereby forming the electrode sheet 21. As an example, the die-cut tab 231 can be die-cut using a die-cutting mechanism, which may include a tool assembly capable of contacting and cutting away a portion of the empty foil region, so that the remaining empty foil region forms a plurality of spaced-apart die-cut tabs 231.

[0087] Step S120: The electrode sheet is wound to form a wound main body, the die-cut electrode tab is wound to form a smoothed electrode tab area, and the full electrode tab is wound to form a flattened electrode tab area. The wound main body has a smoothed electrode tab area and a flattened electrode tab area on at least one side of the electrode assembly in the axial direction.

[0088] Specifically, a winding needle can be set first, and then the electrode sheet 21 can be wound onto the winding needle until it forms an electrode assembly 20. The position of the electrode assembly 20 corresponding to the winding needle can also form a winding center hole 2211 inside the electrode assembly 20. The winding center hole 2211 is a through hole extending along the central axis of the electrode assembly 20. After winding, the main body area 22 of the electrode sheet 21 forms a winding main body 221, the die-cut electrode tabs 231 of the tab area 23 form a smoothed electrode tab area 232, and the full electrode tab 233 forms a flattened electrode tab area 234. For example, in some application scenarios, the electrode sheet 21 includes a first segment and a second segment. The tab area 23 of the first segment is a die-cut tab 231, and the tab area 23 of the second segment is a full tab 233. The winding can start preferentially from the first segment, so that the die-cut tab 231 of the first segment is closer to the center of the winding body 221. This results in the smoothing tab area 232 and the flattening tab area 234 on the same side of the winding body 221 having a higher relative position than the flattening tab area 23. 4. The electrode assembly 20 is closer to the center of the winding body 221 in the radial direction x2; or the winding can start from the second segment first, so that the full tab 233 of the second segment is closer to the center of the winding body 221, thereby making the flattened tab area 234 closer to the center of the winding body 221 in the radial direction x2 of the electrode assembly 20 than the flattened tab area 232, in the flattened tab area 234 on the same side of the winding body 221.

[0089] Through the above embodiments, the electrode sheet 21 is wound to form the wound main body 221 of the electrode assembly 20 by winding the main body area 22, the die-cut tab 231 is wound to form the smoothed tab area 232, and the full tab 233 is wound to form the flattened tab area 234 of the electrode assembly 20. Compared with the electrode assembly 20 which is entirely smoothed by die-cut tab 231, the risk of the die-cut tab 231 being inserted or folded down due to the large number of die-cut tabs 231 can be reduced. Compared with the electrode assembly 20 which is entirely flattened by full tab 233, the risk of self-discharge caused by the large number of particles generated by the full tab 233 can be reduced. At the same time, the smoothed tab area 232 can also allow the gas generated inside the electrode assembly 20 to be discharged through the smoothed tab area 232, thereby improving the gas discharge efficiency inside the electrode assembly 20. Furthermore, the winding body portion 221 has a smoothing tab area 232 and a flattening tab area 234 on at least one side in the axial direction x1. Compared to having only a smoothing tab area 232 or a flattening tab area 234 on the same side, this can further reduce the risk of the die-cut tabs 231 being inserted downwards and / or folded due to the smoothing of too many die-cut tabs 231, and further reduce the risk of self-discharge caused by the large number of particles generated by the flattening of too many full tabs 233.

[0090] In some embodiments, step S120 includes: winding the electrode sheet 21 to form a wound body portion 221 by winding the main body region 22; winding the die-cut electrode tab 231 to form a die-cut electrode tab 231 winding area; and winding the full electrode tab 233 to form a full electrode tab 233 winding area; performing a smoothing operation on the winding area of ​​the die-cut electrode tab 231 by a smoothing mechanism to form a smoothed electrode tab area 232; and performing a kneading operation on the winding area of ​​the full electrode tab 233 by a kneading mechanism to form a kneaded electrode tab area 234.

[0091] Specifically, the smoothing mechanism can be, but is not limited to, mechanical smoothing equipment and ultrasonic smoothing equipment. Mechanical smoothing equipment can include, but is not limited to, smoothing rollers, which can contact and smooth the tabs 233. The smoothing mechanism can include, but is not limited to, pneumatic smoothing mechanisms and mechanical smoothing mechanisms. Pneumatic smoothing mechanisms can use air knives to blow out high-speed, uniform airflow to smooth the tabs. Mechanical smoothing mechanisms can include, but are not limited to, smoothing plates. It should be noted that, firstly, the smoothing mechanism performs a smoothing operation on the winding area of ​​the die-cut tab 231 to form the smoothed tab area 232, and then the kneading mechanism performs a kneading operation on the winding area of ​​the full tab 233 to form the kneaded tab area 234. Compared with performing a kneading operation on the winding area of ​​the full tab 233 first and then performing a smoothing operation on the winding area of ​​the die-cut tab 231, the impact of the kneading operation on the die-cut tab 231 is reduced, thereby reducing the forming difficulty of the smoothed tab area 232 and the kneaded tab area 234.

[0092] In some application scenarios, the flattening mechanism includes a flattening roller, which may include a flattening section and a clearance area. The flattening section is arranged in the axial direction x1 of the electrode assembly 20 corresponding to the winding area of ​​the full tab 233, and the clearance area is arranged in the axial direction x1 of the electrode assembly 20 corresponding to the winding area of ​​the die-cut tab 231. The flattening section can be used to contact the winding area of ​​the full tab 233, and the clearance area can be used to avoid the winding area of ​​the die-cut tab 231. Thus, during the flattening operation of the winding area of ​​the full tab 233, the clearance area avoids the winding area of ​​the die-cut tab 231, reducing the impact of the flattening operation on the die-cut tab 231. For example, when the winding area of ​​the die-cut tab 231 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the winding area of ​​the full tab 233, the clearance area may be closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the flattening portion; when the winding area of ​​the full tab 233 is closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the winding area of ​​the die-cut tab 231, the flattening portion may be closer to the center of the winding body portion 221 in the radial direction x2 of the electrode assembly 20 than the clearance area. In other application scenarios, when the winding area of ​​the die-cut tab 231 is closer to the center of the winding body 221 in the radial direction x2 of the electrode assembly 20 than the winding area of ​​the full tab 233, the flattening roller can be set correspondingly to the winding area of ​​the full tab 233, and the length of the flattening roller in the radial direction x2 of the electrode assembly 20 corresponds to the length of the winding area of ​​the full tab 233 in the radial direction x2, so as to avoid the winding area of ​​the die-cut tab 231. Thus, the flattening mechanism first performs a flattening operation on the winding area of ​​the die-cut tab 231 to form the flattened tab area 232, and then the flattening mechanism performs a flattening operation on the winding area of ​​the full tab 233 to form the flattened tab area 234. This reduces the impact of the flattening operation on the winding area of ​​the die-cut tab 231, and at the same time reduces the forming difficulty of the flattened tab area 232 and the flattened tab area 234, which is conducive to improving production efficiency.

[0093] In some embodiments, the step of performing a smoothing operation on the winding area of ​​the die-cut tab 231 by a smoothing mechanism to form a smoothed tab area 232 includes: simultaneously forming the winding area of ​​the die-cut tab 231 by winding the electrode sheet 21, and simultaneously performing a smoothing operation on the winding area of ​​the die-cut tab 231 by a smoothing mechanism to form a smoothed tab area 232. It is understood that compared to performing a smoothing operation on the winding area of ​​the die-cut tab 231 after the electrode assembly 20 has completely completed the winding process, performing a smoothing operation on the winding area of ​​the die-cut tab 231 by a smoothing mechanism simultaneously forming the winding area of ​​the die-cut tab 231 by winding the electrode sheet 21 to form a smoothed tab area 232 can significantly reduce the forming time of the electrode assembly 20, thereby improving production efficiency. Therefore, while the winding electrode sheet 21 forms the winding area of ​​the die-cut electrode tab 231, the smoothing mechanism performs a smoothing operation on the winding area of ​​the die-cut electrode tab 231 to form the smoothed electrode tab area 232, which helps to improve the forming speed of the electrode assembly 20 and increase production efficiency.

[0094] In summary, the battery cell 100 provided in this application includes a housing 10 and an electrode assembly 20. The housing 10 forms a receiving space 11. The electrode assembly 20 is disposed in the receiving space 11. The electrode assembly 20 includes an electrode sheet 21. The electrode sheet 21 includes a main body region 22 and a tab region 23. The tab region 23 includes a die-cut tab 231 and a full tab 233. The electrode sheet 21 is wound so that the main body region 22 is wound to form the wound main body portion 221 of the electrode assembly 20, the die-cut tab 231 is wound to form the smoothed tab region 232 of the electrode assembly 20, and the full tab 233 is wound to form the flattened tab region 234 of the electrode assembly 20. Therefore, the electrode sheet 21 is wound to form the wound body portion 221 of the electrode assembly 20 by winding the main body region 22, the die-cut tab 231 is wound to form the smoothed tab region 232, and the full tab 233 is wound to form the flattened tab region 234 of the electrode assembly 20. Compared with an electrode assembly 20 that is entirely smoothed by die-cut tabs 231, this reduces the risk of the die-cut tabs 231 being inserted downwards or folded due to an excessive number of die-cut tabs 231. Furthermore, compared with an electrode assembly 20 that is entirely flattened by full tabs 233, this reduces the risk of self-discharge caused by the large number of particles generated by the numerous full tabs 233. At the same time, the smoothed tab region 232 allows gas generated inside the electrode assembly 20 to be discharged through the smoothed tab region 232, improving the gas discharge efficiency inside the electrode assembly 20. Compared with other battery cells, the battery cell 100 provided in this application has higher exhaust efficiency and better reliability.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, The battery cell includes: The outer shell forms a space for containment; An electrode assembly is disposed within the receiving space. The electrode assembly includes an electrode sheet, which includes a main body region and an electrode tab region. The electrode tab region includes a die-cut electrode tab and a full electrode tab. The electrode sheet is wound so that the main body region is wound to form a wound main body portion of the electrode assembly, the die-cut electrode tab is wound to form a smoothed electrode tab region of the electrode assembly, and the full electrode tab is wound to form a kneaded electrode tab region of the electrode assembly. The winding body portion has both the smoothing tab area and the kneading tab area on at least one side of the electrode assembly in the axial direction.

2. The battery cell according to claim 1, characterized in that, In the smoothing tab area and the kneading tab area on the same side of the wound body portion, the smoothing tab area is closer to the center of the wound body portion in the radial direction of the electrode assembly than the kneading tab area.

3. The battery cell according to claim 2, characterized in that, The ratio of the radial dimension of the smoothing tab area in the radial direction to the radial dimension of the wound body in the radial direction is greater than or equal to 5% and less than or equal to 40%.

4. The battery cell according to claim 1, characterized in that, In the smoothing tab area and the kneading tab area on the same side of the wound body portion, the kneading tab area is closer to the center of the wound body portion in the radial direction of the electrode assembly than the smoothing tab area.

5. The battery cell according to claim 1, characterized in that, In the smoothing tab area and the kneading tab area on the same side of the winding body portion, the kneading tab area includes at least two sub-kneading areas spaced apart in the radial direction of the electrode assembly, and the smoothing tab area is located between the at least two sub-kneading areas in the radial direction of the electrode assembly.

6. The battery cell according to claim 1, characterized in that, In the smoothing tab area and the kneading tab area on the same side of the winding body portion, the smoothing tab area includes at least two sub-smoothing areas spaced apart in the radial direction of the electrode assembly, and the kneading tab area is located between the at least two sub-smoothing areas in the radial direction of the electrode assembly.

7. The battery cell according to claim 1, characterized in that, The winding main body is provided with the smoothing tab area and the kneading tab area on both sides of the electrode assembly in the axial direction. The smoothing tab areas on different sides correspond to each other in the axial direction of the electrode assembly, and the kneading tab areas on different sides correspond to each other in the axial direction of the electrode assembly.

8. The battery cell according to claim 1, characterized in that, The battery cell also includes a current collector, which is located on the same side of the winding body where the flattened tab area and the kneaded tab area are located, and the current collector is fixed to both the flattened tab area and the kneaded tab area.

9. The battery cell according to claim 8, characterized in that, In the axial direction, the height of the smoothing tab area protruding from the winding body is lower than the height of the kneading tab area protruding from the winding body. The collector plate includes a first collector body and a second collector body connected to each other. The first collector body is connected to the smoothing tab area, and the second collector body is connected to the kneading tab area. The first collector body is closer to the winding body portion in the axial direction relative to the second collector body.

10. The battery cell according to claim 8, characterized in that, The collector plate is provided with side vent holes, which penetrate the opposite sides of the collector plate in the axial direction and correspond to the smoothing tab area.

11. The battery cell according to claim 10, characterized in that, The collector plate is provided with a central vent hole, which penetrates the opposite two surfaces of the collector plate in the axial direction. The side vent holes and the central vent hole are spaced apart. The electrode sheet winding body is provided with a winding center hole extending in the axial direction. The central vent hole and the winding center hole correspond to each other.

12. The battery cell according to claim 11, characterized in that, The radial dimension of the edge vent is smaller than the radial dimension of the middle vent.

13. The battery cell according to any one of claims 1 to 12, characterized in that, The proportion of the die-cut tabs and the tab region is greater than 0 and less than or equal to 30%.

14. The battery cell according to any one of claims 1 to 12, characterized in that, The battery cell includes a pressure relief mechanism, which is disposed on the housing.

15. A battery device, characterized in that, The battery device includes a battery cell as described in any one of claims 1 to 14.

16. An electrical appliance, characterized in that, The electrical device includes the battery device as described in claim 15.

17. A method for manufacturing a single battery cell, characterized in that, The manufacturing method is used to manufacture a battery cell as described in any one of claims 1 to 14, the manufacturing method comprising: An electrode sheet is provided, the electrode sheet comprising a main body region and a tab region, the tab region comprising a die-cut tab and a full tab; The electrode sheet is wound to form a wound body portion, the die-cut electrode tab is wound to form a smoothed electrode tab region, and the full electrode tab is wound to form a kneaded electrode tab region. The wound body portion has both the smoothed electrode tab region and the kneaded electrode tab region on at least one side of the electrode assembly in the axial direction.

18. The manufacturing method according to claim 17, characterized in that, The steps of winding the electrode sheet to form a wound body portion, winding the die-cut electrode tab to form a smoothed electrode tab region, and winding the full electrode tab to form a kneaded electrode tab region include: The electrode sheet is wound to form a wound main body portion by winding the main body region, the die-cut electrode tab is wound to form a die-cut electrode tab winding area, and the full electrode tab is wound to form a full electrode tab winding area. The smoothed electrode area is formed by performing a smoothing operation on the die-cut electrode winding area using a smoothing mechanism; The flattened electrode area is formed by performing a flattening operation on the total electrode winding area using a flattening mechanism.

19. The manufacturing method according to claim 18, characterized in that, The step of performing a smoothing operation on the die-cut electrode winding area by a smoothing mechanism to form the smoothed electrode area includes: While the electrode sheet is wound to form the die-cut electrode loop winding area, a smoothing mechanism is used to perform a smoothing operation on the die-cut electrode loop winding area to form the smoothed electrode loop area.

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