Electrode assembly, battery cell, battery, power-consuming device and apparatus for forming electrode tabs

Abstract

Electrode arrangement comprising: a first electrode sheet (10A) and a second electrode sheet (10B) having opposite polarities, and a separator film (10C) arranged between the first electrode sheet (10A) and the second electrode sheet (10B), wherein the first electrode sheet (10A), the separator film (10C) and the second electrode sheet (10B) are wound along a winding direction (r) to form a winding structure (100); wherein at least one of the first electrode sheet (10A) and the second electrode sheet (10B) comprises: a current collector (17A; 17B); an active substance layer (12A; 12B) arranged at least on the surface of one side of the current collector (17A; 17B) near the separator film (10C); and an electrode tab section (11A; 11B) which is connected to a side of the current collector (17A; 17B) extending along the winding direction r, wherein the electrode tab section (11A;11B) has a continuous region (15A; 15B) located near the active substance layer (12A; 12B) and a discontinuous region (14A; 14B) located away from the active substance layer (12A; 12B), wherein the discontinuous region (14A; 14B) comprises several electrode tabs (16A; 16B) spaced apart along the winding direction (r).

Description

Technical field The present application relates to the technical field of batteries and in particular to an electrode arrangement, a battery cell, a battery, a power-consuming device and a device for forming electrode tabs. State of the art A rechargeable battery cell, also known as a secondary battery cell, refers to a battery cell that can be used continuously by recharging after discharging, thus reactivating the active substance. Rechargeable battery cells are widely used in electronic devices such as mobile phones, laptops, battery-powered vehicles, electric vehicles, electric aircraft, electric boats, electric toy cars, electric toy ships, electric toy airplanes, and power tools. As a key component of the battery cell, the electrode arrangement poses some problems regarding battery performance or safety during its formation process, specifically in relation to the electrode tabs. Content of the utility model The present application aims to solve at least one of the prior art technical problems of electrode arrangement. To this end, one object of the present application is to provide an electrode arrangement, a battery cell, a battery, a power-consuming device, and a device for forming electrode tabs. In exemplary embodiments of a first aspect of the present application, an electrode arrangement is provided comprising a first electrode sheet and a second electrode sheet having opposite polarities, and a separator film arranged between the first and the second electrode sheet, wherein the first electrode sheet, the separator film, and the second electrode sheet are wound along a winding direction to form a winding structure. At least one of the first and second electrode sheets comprises a current collector.It also comprises an active substance layer arranged at least on the surface of one side of the current collector near the separator film, and an electrode tab section connected to a side of the current collector extending along the winding direction, wherein the electrode tab section comprises a continuous area located near the active substance layer and a discontinuous area located away from the active substance layer, the discontinuous area comprising several electrode tabs spaced apart along the winding direction. In the technical solutions of the embodiments of the present application, the electrode tab section comprises a continuous and a discontinuous area. The discontinuous area includes several electrode tabs spaced apart along the winding direction. These electrode tabs can be formed, for example, by punching. The continuous area allows a specific distance to be created between the electrode tabs and the current collector. This prevents the active substance coating on the current collector from detaching when the electrode tabs are cut, thus improving battery performance. In some embodiments, the height of the electrode tab section with unbent electrode tabs is designated as h0 and the height of the unbent electrode tab as h1 in the axial direction of the winding structure, where h0 and h1 are: 0.25 ≤ h1 / h0 < 1. The height ratio between the electrode tab section and the electrode tab disclosed in this embodiment can ensure that the thickness of the dense layer formed by flattening the electrode tab corresponds to the welding conditions, and also solve the problem of the active substance coating detaching when cutting the electrode tabs as well as the problem of the separator film burning when welding the electrode tab section. In some embodiments, 0.4 ≤ h1 / h0 ≤ 0.8. Through extensive experimental analyses, the applicants of the present application have found that when the height ratio between the electrode tab section and the electrode tab is 0.4 ≤ h1 / h0 ≤ 0.8, the requirements for the thickness of the dense layer are better met, and the problems of active substance coating detachment and separator film burning during welding can be solved. This can optimize welding and electrode tab cutting conditions and lead to a higher yield of the electrode assembly. In some embodiments, at least part of the electrode tab is bent and flattened relative to the current collector, with the maximum distance between the bend line and the tip of the electrode tab being designated h2. In the axial direction of the winding structure, the height of the undistorted electrode tab is designated h1. For h1 and h2, the following holds: 0.3 ≤ h2 / h1 ≤ 1. The dimensional ratio between the electrode tab and the bent part disclosed in this embodiment can ensure that the thickness of the dense layer formed by flattening the electrode tab corresponds to the welding conditions and also increases the wetting properties of the electrolyte solution, thereby increasing the cycle and performance of the electrolysis. In some embodiments, the winding structure is a cylindrical winding structure, wherein the diameter of the central cylinder of the winding structure is denoted as d and the width of the electrode tab as l, where for l and d: 0.7 ≤ l / d ≤ 2. The ratio disclosed in this embodiment between the width of the electrode tab and the diameter of the innermost ring of the winding structure can ensure that the density of the dense layer formed by flattening the electrode tab corresponds to the welding conditions, while at the same time avoiding a loss of yield due to buckling or tearing of the electrode tab during winding of the bare cell. In some embodiments, the maximum distance between adjacent electrode tabs in the electrode tab section is denoted as g and the width of the electrode tab as l, where for l and g: g / l ≤ 0.2. The ratio disclosed in this embodiment between the width of the electrode tab and the distance between adjacent electrode tabs can ensure that the thickness of the dense layer formed by flattening the electrode tab corresponds to the welding conditions, thereby increasing the weld quality. In some embodiments, in the axial direction of the winding structure, the height h0 of the electrode tab section with unbent electrode tabs is: 3 mm ≤ h0 ≤ 8 mm, and / or the height h1 of the unbent electrode tab is: 1 mm ≤ h1 ≤ 8 mm, and / or at least a part of the electrode tab is bent and flattened relative to the current collector, wherein the maximum distance between the bend line and the tip of the electrode tab is referred to as h2, where h2 is: 1 mm ≤ h2 ≤ 8 mm. The dimensioning of the electrode tab section, the electrode tab, and the curved part disclosed in this embodiment allows the electrode tabs to overlap during flattening, thus forming a denser layer. This significantly reduces the probability of laser burn-through and improves weld quality. At the same time, problems such as the detachment of the active substance layer and impairment of the electrolyte solution's wetting are avoided. In some embodiments, the height h0 is: 4 mm ≤ h0 ≤ 7 mm, and / or the height h1 is: 2 mm ≤ h1 ≤ 7 mm, and / or the distance h2 is: 2 mm ≤ h2 ≤ 7 mm. Through extensive experimental analyses, the applicants of the present application have found that the dimensioning of the electrode tab section, the electrode tab, and the bent part disclosed in this embodiment enables an improved density of the dense layer formed by overlapping during the flattening of the electrode tabs. This leads to a significant reduction in the probability of laser burn-through and achieves better results with regard to improving weld quality, preventing the detachment of the active substance layer, and avoiding impairment of the electrolyte solution wetting. In some embodiments, the electrode tab is inclined relative to a side of the current collector running along the winding direction. By angling the electrode tab of the electrode blade relative to the side of the current collector, the stiffness of the electrode tab in the interrupted area can be further reduced, facilitating pressing and flattening. This contributes to increasing the density and thickness of the dense layer formed by flattening, thus improving weld yield. In some embodiments, the inclination direction of the electrode tab is opposite to the winding direction. Because the inclination direction of the electrode tab is opposite to the winding direction of the electrode sheet, the electrode tab is less prone to kinking or breaking during winding of the electrode sheet, which can improve the yield of the winding structure. In some embodiments, at least part of the electrode tab is bent and flattened relative to the current collector. The bent portion of the electrode tab is formed by the rotary pressure of a press head, and the direction of inclination of the electrode tab coincides with the direction of rotation of the press head. This alignment of the electrode tab's inclination direction with the direction of rotation of the press head prevents damage to the electrode tab during flattening, particularly damage to the electrode tab at the outer ring and end section of the winding structure, and thus improves the yield of the winding structure. In some embodiments, the inclination angle θ of the electrode tab is: 45° ≤ θ < 90°. The inclination angle θ of the electrode tab disclosed in this embodiment can effectively reduce the bending strength of the electrode tab, thereby facilitating the pressing and flattening of the electrode tab and effectively avoiding problems such as kinking and breaking of the electrode tab during winding and / or flattening. In some embodiments, a chamfer formed by cutting a corner part is provided on a side of the electrode tab located near the end, which is situated at the end section of the winding structure. When cutting off the end section of the wound electrode sheet, the unknown cutting position can result in the last electrode tab having an insufficient width in the interrupted area. This, in turn, can lead to problems such as detachment, breakage, or lifting of the electrode tab at the end section. To remedy these problems, in this embodiment, the electrode tab at the end section is punched in such a way that its corner portion is removed. In some embodiments, at least part of the chamfer is arc-shaped. Through experimental analyses, the applicants of the present application have found that punching the electrode tab at the end section of the electrode sheet to form an arc-shaped chamfer can more effectively prevent problems such as detachment, breakage or lifting of the electrode tab at the end section and further improve the yield of the winding structure. In embodiments of a second aspect of the present application, a battery cell is provided which comprises an electrode arrangement as described in the embodiments above. In some embodiments, at least part of the electrode tab is bent and flattened relative to the current collector, with the maximum distance between the bend line and the tip of the electrode tab being denoted as h2. The winding structure is a cylindrical winding structure. The battery cell also includes a current collector disk located on one side of the cylindrical winding structure, connected to the electrode tab section, and welded to the bent part of the electrode tab, with the thickness of the current collector disk being denoted as t1. For t1 and h2, 0.05 ≤ t1 / h2 ≤ 0.2. The ratio disclosed in this embodiment between the height of the bent part of the electrode tab and the thickness of the current collecting disk can ensure that the thickness of the dense layer formed by flattening the electrode tab corresponds to the welding conditions, while simultaneously increasing the battery capacity. In embodiments of a third aspect of the present application, a battery is provided which comprises a battery cell as described in the embodiments above. In embodiments of a fourth aspect of the present application, a power-consuming device is provided which includes a battery as described in the embodiments above, wherein the battery serves to provide power. In embodiments of a fifth aspect of the present application, a device for forming electrode tabs is provided, comprising a press head, wherein the press head serves to smooth an electrode tab in an electrode arrangement described above, such that at least part of the electrode tab is bent and flattened relative to the current collector. In some embodiments, the electrode tab is inclined relative to a side of the current collector running along the winding direction. The direction of rotation of the press head is designed to coincide with the inclination direction of the electrode tab. By ensuring that the direction of rotation of the press head matches the direction of inclination of the electrode tab, damage to the electrode tab during flattening, especially to the electrode tab on the outer ring and the end section of the winding structure, can be avoided and the yield of the winding structure improved. The above description merely provides an overview of the technical solution of the present application. To better understand the technical means of the present application, they can be implemented according to the details in the description. To make the above-mentioned and further purposes, features, and advantages of the present application clearer and more understandable, the detailed embodiments of the present application are listed below. Description of the drawings In the accompanying drawings, unless otherwise indicated, the same reference numerals in all drawings denote identical or similar parts or elements. These drawings are not necessarily to scale. It is understood that the drawings only depict some disclosed embodiments according to the present application and are not to be interpreted as limiting the scope of protection of the present application. Fig. 1 shows a schematic representation of the structure of some embodiments of a power-consuming device according to the present application; Fig. 2A shows a schematic representation of the structure of some embodiments of a battery according to the present application; Fig. 2B shows a schematic representation of the structure of the electrical connection of several battery cells in some embodiments of a battery according to the present application; Fig.Figure 3 shows a schematic exploded view of a battery cell formed according to some embodiments of a battery cell of the present application; Figure 4 shows a schematic cross-sectional view of a winding structure formed according to some embodiments of an electrode arrangement of the present application; Figure 5 shows a schematic representation of the structure of a first electrode sheet, a second electrode sheet and a separator film in some embodiments of an electrode arrangement according to the present application; Figure 6 shows a schematic representation of the structure of some embodiments of an electrode arrangement according to the present application; Figure 7 shows a schematic representation of the structure of some further embodiments of an electrode arrangement according to the present application; FigureFigure 8 shows a schematic representation of an unfolded electrode sheet in some embodiments of an electrode arrangement according to the present application; Figure 9 shows a schematic representation of the cross-section of an electrode sheet in some embodiments of an electrode arrangement according to the present application; Figure 10 shows a schematic representation of an unfolded electrode sheet in some further embodiments of an electrode arrangement according to the present application; Figure 11 shows a schematic representation of the structure of some further embodiments of an electrode arrangement according to the present application; Figure 12 shows a schematic representation of an unfolded electrode sheet in some further embodiments of an electrode arrangement according to the present application. Reference symbol list: 10A: First electrode sheet; 10B: Second electrode sheet; 10C: Separator film; 100: Winding structure; 11A, 11B, 222: Electrode tab section; 12A, 12B: Active substance layer; 13A: Insulating layer; 17A, 17B: Current collector; 14A, 14B: Interrupted section; 15A, 15B: Continuous section; 16A, 16B: Electrode tab; 1000: Press head; 20: Battery cell; 21: Housing assembly; 211: Housing body; 212: End cap; 22: Electrode assembly; 221: Main body section; 23: Current collector component; 230: Current collector disc; 231: Welding area; 30: Battery; 31: First box body; 32: Second box body; 33: Electrode connection; 34: Busbar; 40: Vehicle. Detailed descriptions The following describes in detail the embodiments of the technical solutions of the present application with reference to the drawings. These embodiments serve only to clarify the technical solution of the present application, merely provide examples, and are not intended to limit the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by a person skilled in the art in the field of the present application; the terminology used herein serves solely to describe certain embodiments and is not intended to limit the present application; the terms "comprising" and "with" and all variations thereof in the description, claims and foregoing drawings of the present application are intended to signify non-exclusive inclusion. In the description of embodiments of this application, technical terms such as "first" and "second", etc., are used solely to distinguish between different objects and should not be interpreted as indicating or suggesting a relative meaning, nor as implicitly specifying the quantity, particular order, or hierarchical relationship of the technical features mentioned. In the description of embodiments of this application, the term "several" means two or more, unless expressly stated otherwise. The reference to "embodiment" here means that a particular feature, structure, or property described in connection with the embodiments may be included in at least one embodiment of the present application. The occurrence of this expression at different points in the description does not necessarily always refer to the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments. It is expressly and implicitly clear to the person skilled in the art that the embodiments described herein may be combined with other embodiments. In the embodiments of this application, the term "and / or" merely describes the relationship between related objects and indicates that three states of the relationship are possible. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the symbol " / " in this application generally indicates that the objects preceding and following it are in an "or" relationship. In the description of embodiments of the present application, the term “several” refers to two or more (including two), likewise “several sets” refers to two or more sets (including two sets) and “several sheets” refers to two or more sheets (including two sheets). In the description of the embodiments of this application, the orientation or position relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., refer to the orientation or position relationships shown in the drawings and serve only to simplify the description of the embodiments of this application. They are not intended to suggest or imply that the devices or elements described must have a specific orientation or be designed or operated in a specific orientation, and therefore must not be understood as limiting the embodiments of this application. In the description of the embodiments of this application, the technical terms "assemble," "connect," "connect," "fasten," etc., are to be interpreted broadly unless expressly specified otherwise or limited. For example, they may mean a permanent connection, a detachable connection, or a one-piece construction. They may also mean a mechanical connection or an electrical connection. They may mean a direct connection or an indirect connection via an intermediate element. A person skilled in the art in this field will be able to understand the specific meanings of the aforementioned terms in the embodiments of this application according to the specific circumstances. Current market developments indicate that the use of high-performance batteries is becoming increasingly widespread. High-performance batteries are not only used in energy storage and power supply systems such as hydroelectric, thermal, wind, and solar power plants, but also find broad application in electric transport vehicles such as e-bikes, e-motorcycles, and electric cars, as well as in military equipment, aerospace, and other sectors. As the application areas of high-performance batteries continue to expand, market demand is growing accordingly. In some related technologies, an electrode array in a cylindrical battery cell has long electrode tabs that protrude from the ends of a winding structure. These long electrode tabs are continuously distributed along the winding direction of an electrode sheet. Before the long electrode tabs are welded to a current collector disk, they must be bent and flattened to form a structure in which the electrode tabs overlap layer by layer from the outside in. Through analysis, the applicants found that the long electrode tabs exhibit a certain curvature as the electrode sheet is wound. When flattened, these bent electrode tabs tend to wrinkle, which can easily lead to breakage and damage to the electrode tabs.Furthermore, the penetration of folds into the electrode sheet can cause a short circuit, compromising the battery's safety performance. The ring-wound, long electrode tabs exhibit high flexural strength, and ensuring continuous and uniform deformation during pressing and collapse is challenging. Consequently, the overlapping layer of flattened electrode tabs is uneven and has a low density, which can easily lead to burn-through during welding to the current collector disc, posing a significant challenge for manufacturing equipment and processes. Taking into account the above-mentioned aspects, the embodiments of the present application provide an electrode arrangement, a battery cell, a battery, a power-consuming device and a device for forming electrode tabs, which can improve the safety performance of the battery. The electrode arrangement of the embodiments of the present application is applicable to various types of battery cells. The battery cells can comprise a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, the embodiments of the present disclosure being no limited thereto. The battery cells can be cylindrical, flat, rectangular, or of other shapes, the embodiments of the present disclosure being no limited thereto. The battery cells are generally classified as cylindrical, square, and pouch cells according to their encapsulation type. However, the embodiments of the present application are not limited thereto. The battery cell of the embodiments of the present application is applicable to various types of batteries. The battery can be used to supply power to electrical devices such as vehicles, for example, to provide energy for vehicle operation or driving. The battery can comprise a housing and a battery module, the housing providing a receiving space for the battery module, which is arranged inside the housing. The housing can be made of metal. The battery module can comprise several battery cells connected in series, parallel, or in a mixed configuration. The battery cell is the smallest unit that forms the battery. The battery cell includes an electrode arrangement in which the electrochemical reaction takes place. The battery in the embodiments of the present application is applicable to various types of power-consuming devices that use a battery. These power-consuming devices can be mobile phones, portable devices, laptops, battery-powered vehicles, electric vehicles, ships, spacecraft, electric toys, power tools, etc. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys can be stationary or mobile, such as game consoles, toy electric vehicles, toy electric boats, and toy electric airplanes. Power tools include electric cutting tools, electric grinding tools, electric assembly tools, and electric railway tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.The embodiments of the present invention do not represent any particular limitations with regard to the above power-consuming devices. Fig. 1 shows a schematic representation of the structure of some embodiments of a power-consuming device according to the present application. For clarity, a vehicle is used as an example to illustrate the power-consuming device. Referring to Fig. 1, a battery 30 is arranged in the vehicle 40. The battery 30 is located at the bottom, front, or rear of the vehicle 40. The battery 30 can be used to supply power to the vehicle 40. For example, the battery 30 serves as the operating current source for the vehicle 40. The vehicle 40 can also include a control unit and a motor, the control unit being used to control the battery 30 to supply power to the motor, for example, to meet the power requirements of the vehicle 40 during starting, navigation, and driving. In some embodiments of the present application, the battery 30 can not only serve as an operating current source for the vehicle 40, but can also be used as a drive current source for the vehicle 40, thereby replacing fuel or natural gas wholly or partially and providing drive power to the vehicle 40. Fig. 2A shows a schematic representation of the structure of some embodiments of a battery according to the present application. Fig. 2B shows a schematic representation of the structure of the electrical connection of several battery cells in some embodiments of a battery according to the present application. Referring to Fig. 2A, the battery 30 in some embodiments comprises a box body and one or more battery cells 20 arranged in the box body. The box body comprises a first box body 31 and a second box body 32, wherein the first box body 31 and the second box body 32 cover each other and together define a receiving space for receiving the battery cells 20. The second box body 32 can be a hollow, open-ended structure to form a receiving chamber for receiving the battery cells 20.The first box body 31 can be a plate-like structure. The first box body 31 covers the open side of the second box body 32, so that the first box body 31 and the second box body 32 together define a receiving space. The first box body 31 and the second box body 32 can also be hollow structures with an open side to form a receiving chamber for receiving the battery cells 20, and the open side of the first box body 31 covers the open side of the second box body 32. Of course, the box body 20 formed from the first box body 31 and the second box body 32 can have various shapes, which can be, for example, cylindrical or cuboid. To facilitate the observation of the multiple battery cells 20 inside the box body 31, Fig. 2A shows only a part of the second box body 32. Referring to Fig.2B, the individual battery cells 20 are electrically connected to one another, for example in series, parallel or mixed configurations, to achieve the required electrical performance parameters of the battery 30. The multiple battery cells 20 are arranged in a series. Depending on requirements, one or more rows of battery cells 20 can be arranged in the housing. In some embodiments, the individual battery cells 20 of the battery 30 can be arranged along at least one of the longitudinal and lateral directions of the housing. Depending on the actual requirements, at least one row or one column of battery cells 20 can be arranged. Depending on the requirements, one or more layers of battery cells 20 can also be arranged in the vertical direction of the battery 30. In some embodiments, the multiple battery cells 20 can be connected in series, parallel, or mixed configurations to form a battery module, and multiple battery modules can then be connected in series, parallel, or mixed configurations to form a whole that is housed in the box body. In some further embodiments, all battery cells 20 can be directly connected to one another in series, parallel, or mixed configurations, and then the whole formed from all battery cells 20 is housed in the box body. In Fig. 2B, the electrode terminal 33 of battery cell 20 is electrically connected to the adjacent battery cell 20 via a busbar 34. Fig. 3 shows a schematic exploded view of a battery cell according to some embodiments of the present application. As shown in Fig. 3, the battery cell 20 can comprise a housing assembly 21 and an electrode assembly 22 arranged in the housing assembly 21. The housing assembly 21 comprises a housing body 211 and an end cap 212. The housing body 211 has a hollow structure with an opening on one side. The end cap 212 covers the opening of the housing body 211 to form a tight connection, thereby creating a sealed space for receiving the electrode assembly 22. The electrode assembly 22 is arranged in the cavity of the housing body 211. The housing body 211 and the end cap 212 can be independent components. The end cap 212 covers the opening of the housing body 211 to form an internal environment for the battery cells 20. The housing body 211 and the end cap 212 can be formed as a single piece without limitation. In particular, the housing body 211 and the end cap 212 can form a common interface before the insertion of other components. If the battery cells 20 need to be encapsulated inside the housing body, the end cap 212 is then placed onto the housing body 211. The housing body 211 and the end cap 212 can be made of various materials, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application are not specifically limited in this respect. Understandably, the housing arrangement is not limited to the structure described above. The housing arrangement can also have other structures. For example, the housing arrangement can comprise a housing body and two end caps, the housing body having a hollow structure with opposing openings on both sides. The end caps each cover one opening of the housing body to form a tight seal, creating a sealed space to accommodate the electrode assembly and the electrolyte. The electrode assembly 22 can comprise a main body section 221 and an electrode tab section 222, the electrode tab section 222 extending from the main body section 221 such that the electrode tab section 222 projects from one end of the main body section 221. The electrode assembly 22 can comprise a positive electrode sheet, a negative electrode sheet, and a separator film. The electrode assembly 22 can have a wound structure formed by winding the positive electrode sheet, the negative electrode sheet, and the separator film. The electrode assembly 22 can have a stacked structure formed by stacking the positive electrode sheet, the negative electrode sheet, and the separator film.The positive electrode sheet comprises a positive electrode current collector and positive electrode active substance layers applied to both sides of the positive electrode current collector. The negative electrode sheet comprises a negative electrode current collector and negative electrode active substance layers applied to both sides of the negative electrode current collector. The main body section 221 is a part of the electrode assembly 22 that corresponds to an area of ​​the electrode sheet coated with the active substance layer, and the electrode tab section 222 is a part of the electrode sheet that is not coated with the active substance layer. The electrode tab section 222 can be subdivided into a positive and a negative electrode tab section. The positive and negative electrode tab sections can be arranged at both ends of the main body section 221 or at one end of the main body section 221.As shown in Fig. 3, the battery cell 20 comprises, in addition to the electrode assembly 22 and the housing assembly 21, an electrolyte solution and a current collector 23. The electrolyte solution is located in the housing body and permeates the electrode assembly 22. The housing assembly 21 comprises an electrode output (such as the housing body, end cap, or electrode terminal located on the housing body or end cap) for the input or output of electrical energy; the electrode assembly 22 is arranged in the housing assembly 21; the current collector 23 is received in the housing assembly 21, and the current collector 23 serves to connect the electrode output of the housing assembly 21 to the electrode tab section 222 of the electrode assembly 22 such that the electrode tab section 222 is electrically connected to the electrode output.In some embodiments, the current collecting component 23 can, for example, be designed in a disc shape and be referred to as a current collecting disc to facilitate the connection with the electrode tab section 222 at the end of the electrode arrangement 22. Fig. 4 shows a schematic representation of the cross-section of a winding structure formed according to some embodiments of an electrode arrangement of the present application. Referring to Fig. 4, the electrode arrangement according to some embodiments of the present application comprises a first electrode sheet 10A and a second electrode sheet 10B having opposite polarities, and a separator film 10C arranged between the first electrode sheet 10A and the second electrode sheet 10B. The first electrode sheet 10A, the separator film 10C, and the second electrode sheet 10B are wound along a winding direction r to form a winding structure 100, for example, a stacked structure of the second electrode sheet 10B, the separator film 10C, the first electrode sheet 10A, the separator film 10C, etc., formed radially along the winding structure 100 in Fig. 4.The first electrode sheet 10A can be either the negative or the positive electrode sheet, and the second electrode sheet 10B can be either the positive or negative electrode sheet with the opposite polarity to the first electrode sheet 10A. The winding structure 100 can be a cylindrical winding structure formed by coiling. Accordingly, the battery cell, which includes the electrode assembly, uses a casing body that has a cylindrical casing body structure. The battery cell 10 functions primarily through the movement of metal ions between the positive and negative electrode sheets. The separator film 10C can be made of polypropylene (PP) or polyethylene (PE). Fig. 5 shows a schematic representation of the arrangement of a first electrode sheet, a second electrode sheet, and a separator film in some embodiments of an electrode arrangement according to the present application. Fig. 6 shows a schematic representation of the structure of some embodiments of an electrode arrangement according to the present application. Fig. 7 shows a schematic representation of the structure of some further embodiments of an electrode arrangement according to the present application. Fig. 8 shows a schematic representation of an unfolded electrode sheet in some embodiments of an electrode arrangement according to the present application. Fig. 9 shows a schematic representation of the cross-section of an electrode sheet in some embodiments of an electrode arrangement according to the present application. Referring to Figs. 5, 8, and 9, in some embodiments at least one of the first electrode sheet 10A and the second electrode sheet 10B comprises a current collector 17A, 17B, an active substance layer 12A, 12B, and an electrode tab section 11A, 11B. For example, when the first electrode sheet 10A is shown in Figs. 8 and 9, the first electrode sheet 10A, as shown in Figs. 5, 8, and 9, comprises the current collector 17A, the active substance layer 12A, and the electrode tab section 11A. The active substance layer 12A is arranged at least on the surface of one side of the current collector near the separator film 10C. For example, if the second electrode sheet 10B is shown in Fig. 8 and Fig. 9, the second electrode sheet 10B comprises, as shown in Fig. 5, Fig. 8 and Fig. 9, the current collector 17B, the active substance layer 12B and the electrode tab section 11B.The active substance layer 12B is located at least on the surface of one side of the current collector near the separator film 10C. In the example where the first electrode sheet 10A is the negative electrode sheet, the negative electrode sheet comprises the current collector (i.e., the negative electrode current collector), the active substance layer 12A (i.e., the negative electrode active substance layer), and the electrode tab section 11A (i.e., the negative electrode tab section). The active substance layer 12A is applied to the surface of the current collector. In the example of Fig. 5, the negative electrode sheet can also include an insulating layer 13A (such as a ceramic insulating layer) that covers the surface of the current collector and is located on one side of the active substance layer 12A near the electrode tab section 11A. The insulating layer 13A can prevent the burrs on the cut edges of the anode electrode sheet from penetrating the separator film and causing a short circuit with the cathode electrode sheet. The electrode tab section 11A is connected to a side of the current collector extending along the winding direction r. The electrode tab section 11A has two regions: a continuous region 15A located near the active substance layer, and a discontinuous region 14A located away from the active substance layer, the discontinuous region 14A comprising several electrode tabs 16A spaced apart along the winding direction r. The negative electrode current collector can be made of copper, and the negative electrode active substance layer can be made of graphite, silicon, or the like. In some embodiments, the electrode tab section 11A can be welded to the side of the current collector. The electrode tab section 11A can also be formed by stamping the current collector. For example, assuming the second electrode sheet 10B is the positive electrode sheet, the positive electrode sheet comprises the current collector (i.e., the positive electrode current collector), the active substance layer 12B (i.e., the positive electrode active substance layer), and the electrode tab section 11B (i.e., the positive electrode tab section). The active substance layer 12B is applied to the surface of the current collector. The electrode tab section 11B is connected to a side of the current collector extending along the winding direction r. The electrode tab section 11B has two regions: a continuous region 15B located near the active material layer, and a discontinuous region 14B located away from the active material layer, the discontinuous region 14B comprising several electrode tabs 16B spaced apart along the winding direction r. Using the example of a lithium-ion battery, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can consist of lithium cobalt oxide, lithium iron phosphate, tertiary lithium, or lithium manganese oxide. In some embodiments, the electrode tab section 11B can be welded to the side of the current collector. The electrode tab section 11B can also be formed by stamping the current collector. As shown in Figs. 6 and 7, in the electrode arrangement, the electrode tab section 11A of the first electrode sheet 10A and the electrode tab section 11B of the second electrode sheet 10B protrude from the ends of the winding structure 100 and can be bent and flattened by a press head, for example by rolling or smoothing. The flattened electrode tab section is then welded to the current collector component (e.g., to the current collector disk 230 in Fig. 7). In Fig. 7, for example, the two ends of the winding structure 100 are provided with the electrode tab section 11A and the electrode tab section 11B, respectively, and the electrode tab section 11A and the electrode tab section 11B are each welded to the current collector disk 230 after rolling or smoothing. Referring to Figures 5, 6 to 7, the continuous section 15A, 15B and the interrupted section 14A, 14B are arranged in the electrode tab section 11A, 11B. The interrupted section 14A, 14B comprises several electrode tabs 16A, 16B spaced apart along the winding direction r. These electrode tabs 16A, 16B can be formed, for example, by punching. The continuous section 15A, 15B allows a specific distance to be created between the electrode tabs 16A, 16B and the current collector 17A, 17B. This prevents the active substance coating on the current collector 17A, 17B from detaching during the punching of the electrode tabs and thus improves battery performance. Furthermore, the interrupted section 14A, 14B exhibits a significantly lower flexural strength than the continuous section 15A, 15B when the electrode tab section 11A, 11B is flattened. This ensures that when the interrupted section 14A, 14B is bent and flattened, the continuous section 15A, 15B does not exhibit any noticeable flow bending. This prevents the end face of the electrode tab section from being too close to the separator film 10C, which would otherwise lead to the separator film 10C burning during welding of the flattened electrode tab section 11A, 11B. Furthermore, the arrangement of several spaced electrode tabs 16A, 16B on the side of the electrode sheet 10A, 10B running along the winding direction r reduces wrinkling when the electrode tabs 16A, 16B are flattened at the end of the winding structure 100. This largely prevents problems such as breakage of the electrode tabs 16A, 16B due to wrinkling, penetration of convex folds of the electrode tabs 16A and 16B into the electrode sheet layers with resulting damage to the electrode sheet, and short circuits caused by this. In addition, the flattened, offset electrode tabs 16A, 16B form a more compact, dense layer when overlapping, which prevents burn-through in subsequent welding processes and thus improves the weld yield. According to some embodiments of the present application, the axis of the winding structure 100, as shown in Fig. 6, Fig. 7 and Fig. 8, is designated as X. In the axial direction of the winding structure 100, i.e., in the direction of the axis X, the height of the electrode tab section with straight electrode tabs is designated as h0 and the height of the straight electrode tab is designated as h1, where for both: 0.25 ≤ h1 / h0 < 1. In some embodiments, for example, h1 / h0 can be equal to 0.25, 0.35, 0.45, 0.55, 0.65, 0.75, 0.85 or 0.95. Of course, the numerical range of h1 / h0 is not limited to this. In other embodiments, for example, it could be a different value, as long as the condition h1 < h0 can be satisfied. Understandably, the electrode tab in the electrode assembly must be bent and flattened in the final state to establish a connection with the current collector disk. As shown in Fig. 8, the height h0 of the electrode tab section and the height h1 of the electrode tab in this embodiment refer to the heights with the electrode tabs 16A, 16B undistorted, which can also be referred to as the original heights of the electrode tab section and the electrode tab 16A, 16B. In some embodiments, h0 and h1 can be measured before bending the electrode tabs 16A, 16B of the electrode sheet, as shown in Fig. 8. In other embodiments, h0 and h1 can also be measured by straightening the electrode tab section 11A, 11B in the winding structure 100, as shown in Figs. 6 and 7. In this embodiment, the dimension of the electrode tab section of at least one of the first electrode sheet 10A and the second electrode sheet 10B satisfies the above formula. For example, the electrode tab section 11A of the first electrode sheet 10A can satisfy the above dimension, or the electrode tab section 11B of the second electrode sheet 10B can satisfy the above dimension, or both the electrode tab section 11A of the first electrode sheet 10A and the electrode tab section 11B of the second electrode sheet 10B can satisfy the above dimension. The height h0 of the electrode tab section indicates the dimension of extension of the electrode tab section in a direction perpendicular to the side of the current collector; the height h1 of the electrode tab corresponds to the height of the interrupted area, and likewise the height h1 of the electrode tab indicates the dimension of extension of the electrode tab along a direction perpendicular to the side of the current collector. Through analysis, the applicants of the present application have found that if h1 / h0 < 0.25, the height of the electrode tab in the interrupted area is insufficient. The dense layer formed by flattening the electrode tab is too thin, which can easily lead to problems such as burn-through. If h1 / h0 ≥ 1, the height of the electrode tab is greater than or equal to the total height of the electrode tab section. Cutting the electrode tabs can easily lead to the detachment of the active substance coating. Furthermore, there is a risk of burning the separator film when welding the flattened electrode tab section.The height ratio between the electrode tab section and the electrode tab disclosed in this embodiment can ensure that the thickness of the dense layer formed by flattening the electrode tab corresponds to the welding conditions, and also solve the problem of the active substance coating detaching when cutting off the electrode tab as well as the problem of the separator film burning when welding the electrode tab section. According to some embodiments of the present application, the height h0 of the electrode tab section with unbent electrode tabs and the height h1 of the unbent electrode tab are: 0.4 ≤ h1 / h0 ≤ 0.8. In some embodiments, for example, h1 / h0 can be equal to 0.4, 0.5, 0.6, 0.7 or 0.8. Through extensive experimental analyses, the applicants of the present application have found that when the height ratio between the electrode tab section and the electrode tab is 0.4 ≤ h1 / h0 ≤ 0.8, the requirements for the thickness of the dense layer are better met, and the problems of active substance coating detachment and separator film burning during welding can be solved. This can optimize welding and electrode tab cutting conditions and lead to a higher yield of the electrode assembly. According to some embodiments of the present application, at least a portion of the electrode tab is bent and flattened relative to the current collector, as shown in Fig. 8, where the maximum distance between the bend line and the tip (of the free end) of the electrode tab 16A, 16B is designated as h2, i.e., the height of the bent portion is designated as h2. In the axial direction of the winding structure 100, the height of the undistorted electrode tab is designated as h1. For h1 and h2, the following holds: 0.3 ≤ h2 / h1 ≤ 1. In some embodiments, for example, h2 / h1 can be equal to 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1. Of course, the numerical range of h2 / h1 is not limited to this in practice. For example, h2 / h1 can also be greater than 1 in other embodiments, i.e., flow bending can also occur in the continuous area of ​​the electrode tab section. In this embodiment, the dimension of the electrode tab section of at least one of the first electrode sheet 10A and the second electrode sheet 10B satisfies the above formula. For example, the electrode tab section 11A of the first electrode sheet 10A can satisfy the above dimension, or the electrode tab section 11B of the second electrode sheet 10B can satisfy the above dimension, or both the electrode tab section 11A of the first electrode sheet 10A and the electrode tab section 11B of the second electrode sheet 10B can satisfy the above dimension. The curved and flattened part of the electrode tab also serves to weld to the current collector component (e.g., the current collector disc 20). The height h2 of the curved part of the electrode tab influences the yield of the subsequent weld. Through analysis, the applicants of the present application have found that if h2 / h1 < 0.3, the height of the bent portion is insufficient. This results in a dense layer that is too thin to meet the welding requirements and can easily lead to problems such as burn-through. If h2 / h1 > 1, the height of the bent portion is greater than the height of the unbent electrode tab. This means that even the continuous area is bent. In this case, the thickness of the dense layer formed by the flattening does not increase significantly. Instead, the gap between the electrode tabs is completely compressed, which adversely affects the wetting properties of the electrolyte solution.The dimensional ratio between the electrode tab and the bent part disclosed in this embodiment can ensure that the thickness of the dense layer formed by flattening the electrode tab corresponds to the welding conditions and also increases the wetting properties of the electrolyte solution, thereby increasing the cycle and performance of the electrolysis. As shown in Fig. 6, according to some embodiments of the present application, the winding structure 100 is a cylindrical winding structure. The diameter of the central cylinder of the winding structure 100 is denoted as d. With the position indicated by the arrow of the winding direction (r) as the starting end, d refers to the circumferential diameter of the electrode sheet layer that, in the cylindrical winding structure 100, corresponds to the first electrode tab of the electrode tab section 11A, 11B in the winding direction (r), i.e., the minimum diameter of the innermost ring of the electrode tab of the winding structure is denoted as d. The width of the electrode tab is denoted as l, where 0.7 ≤ l / d ≤ 2. The width l of the electrode tab corresponds to the dimension of the electrode tab along the winding direction r. In some embodiments, for example, l / d can be equal to 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2. In this embodiment, the dimension of the electrode tab of at least one of the electrode sheets 10A and 10B satisfies the above formula. For example, the electrode tab 16A of the first electrode sheet 10A can satisfy the above dimension, or the electrode tab 16B of the second electrode sheet 10B can satisfy the above dimension, or both the electrode tab 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B can satisfy the above dimension. Through analysis, the applicants of the present application have found that if l / d < 0.7, the electrode tab width is too small. When winding the electrode sheet after punching the electrode tab, as well as when winding the bare cell, the electrode tab tends to kink and tear, leading to yield losses or even safety issues. If l / d > 2, the electrode tab width is excessively large. This prevents the electrode tab's strength (particularly in the inner and middle rings of the bare cell) from being effectively reduced, and the density of the dense layer formed by flattening cannot be sufficiently improved, easily resulting in poor welding outcomes.The ratio disclosed in this embodiment between the width of the electrode tab and the diameter of the innermost ring of the winding structure can ensure that the density of the dense layer formed by flattening the electrode tab corresponds to the welding conditions, while at the same time avoiding a loss of yield due to buckling or tearing of the electrode tab during winding of the bare cell. As shown in Fig. 8, according to some embodiments of the present application, the maximum distance between adjacent electrode tabs in the electrode tab section is designated as g and the width of the electrode tab as l, where for l and g: g / l ≤ 0.2. In some embodiments, g / l can be equal to 0.05, 0.10, 0.15, or 0.2. In this embodiment, the dimension of the electrode tab of at least one of the electrode sheets 10A and 10B satisfies the above formula. For example, the electrode tab 16A of the first electrode sheet 10A can satisfy the above dimension, or the electrode tab 16B of the second electrode sheet 10B can satisfy the above dimension, or both the electrode tab 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B can satisfy the above dimension. Through analysis, the applicants of the present application discovered that when g / l > 0.2, the electrode pad width is too small and the spacing between the electrode pads is too large. Consequently, the dense layer formed by the flattening is insufficiently thick, which can negatively impact the weld yield. The ratio between the electrode pad width and the spacing between adjacent electrode pads disclosed in this embodiment ensures that the thickness of the dense layer formed by the flattening of the electrode pad meets the welding conditions, thereby improving weld quality. As shown in Fig. 8, according to some embodiments of the present application, the height h0 of the electrode tab section with unbent electrode tabs is: 3 mm ≤ h0 ≤ 8 mm, and / or the height h1 of the unbent electrode tab is: 1 mm ≤ h1 ≤ 8 mm, and / or the height h2 of the bent part of the electrode tab is: 1 mm ≤ h2 ≤ 8 mm. In some embodiments, h0 can be, for example, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm. h1 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm. h2 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm. In this embodiment, the dimension of the electrode tab section of at least one of the first electrode sheet 10A and the second electrode sheet 10B satisfies the above formula. For example, the electrode tab section 11A of the first electrode sheet 10A can satisfy the above dimension, or the electrode tab section 11B of the second electrode sheet 10B can satisfy the above dimension, or both the electrode tab section 11A of the first electrode sheet 10A and the electrode tab section 11B of the second electrode sheet 10B can satisfy the above dimension. Through extensive experimental analyses, the applicants of the present application have discovered that the dimensioning of the electrode tab section, the electrode tab, and the curved part disclosed in this embodiment allows the electrode tabs to overlap during flattening, thus forming a denser electrode tab layer. This significantly reduces the probability of laser burn-through and improves weld quality. At the same time, problems such as the detachment of the active substance coating and impairment of the electrolyte solution's wetting are avoided. As shown in Fig. 8, according to some embodiments of the present application, the height h0 of the electrode tab section with straight electrode tabs is: 4 mm ≤ h0 ≤ 7 mm, and / or the height h1 of the straight electrode tab is: 2 mm ≤ h1 ≤ 7 mm, and / or the height h2 of the bent part of the electrode tab is: 2 mm ≤ h2 ≤ 7 mm. In this embodiment, the dimension of the electrode tab section of at least one of the first electrode sheet 10A and the second electrode sheet 10B satisfies the above formula. In some embodiments, h0 can be, for example, 4 mm, 5 mm, 6 mm, or 7 mm. h1 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or 7 mm. h2 can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or 7 mm. Through extensive experimental analyses, the applicants of the present application have found that the dimensioning of the electrode tab section, the electrode tab, and the bent part disclosed in this embodiment enables an optimized density of the electrode tab layer formed by overlapping during the flattening of the electrode tabs. This leads to a significant reduction in the probability of laser burn-through and achieves better results with regard to improving weld quality, preventing the detachment of the active substance coating, and avoiding impairment of the electrolyte solution wetting. Fig. 10 shows a schematic representation of an unfolded electrode sheet in some further embodiments of an electrode arrangement according to the present application. According to some embodiments of the present application, the electrode tab 16A, 16B of the electrode sheet 10A, 10B is inclined relative to a side of the current collector running along the winding direction, as shown in Fig. 10. In this embodiment, at least one of the electrode tabs 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B is inclined. For example, the electrode tab 16A of the first electrode sheet 10A can be inclined, or the electrode tab 16B of the second electrode sheet 10B can be inclined, or both the electrode tab 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B can be inclined. In conventional designs, the electrode tab extends perpendicular to the side of the current collector. In the embodiments of the present application, the electrode tab does not extend perpendicularly, but is inclined at a specific angle to the side of the current collector. By angling the electrode tab of the electrode blade relative to the side of the current collector, the rigidity of the electrode tab in the interrupted area can be further reduced, and pressing and flattening can be facilitated. This contributes to increasing the density and thickness of the dense layer formed by flattening and thus improves the welding yield. As shown in Fig. 10, according to some embodiments of the present application, the inclination angle θ of the electrode tab 16A, 16B is: 45° ≤ θ < 90°. In some embodiments, for example, θ can be 45°, 55°, 65°, 75° or 85°. In this embodiment, the inclination angle of at least one of the electrode tabs 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B satisfies the above condition. For example, the inclination angle of the electrode tab 16A of the first electrode sheet 10A can satisfy the above condition, or the inclination angle of the electrode tab 16B of the second electrode sheet 10B can satisfy the above condition, or the inclination angles of both the electrode tab 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B can satisfy the above condition. Through extensive experimental analyses, the applicants of the present application have found that at an electrode tab inclination angle of less than 45°, the bending strength of the electrode tab cannot be effectively reduced, but instead makes the electrode tab more susceptible to kinking and breakage. The electrode tab inclination angle θ disclosed in this embodiment can effectively reduce the bending strength of the electrode tab, thereby facilitating the pressing and flattening of the electrode tab and effectively avoiding problems such as kinking and breakage of the electrode tab during winding and / or flattening. Fig. 11 shows a schematic representation of the structure of some further embodiments of an electrode arrangement according to the present application. As shown in Fig. 11, according to some embodiments of the present application, the inclination direction of the electrode tab 16A, 16B in the electrode sheet 10A, 10B is opposite to the winding direction r of the electrode sheet 10A, 10B. In this embodiment, at least one of the electrode tabs 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B is inclined, with its inclination direction being opposite to the winding direction r. For example, in Fig. 10, both the electrode tab 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B are inclined, with the inclination directions of both being opposite to the winding direction r. Because the inclination direction of the electrode tab is opposite to the winding direction of the electrode sheet, the electrode tab is less prone to kinking or breaking when the electrode sheet is wound, which can improve the yield of the winding structure. As shown in Fig. 11, according to some embodiments of the present application, the curved part of the electrode tab 16A, 16B is bent and flattened by the rotary pressing of the press head 1000. The press head 1000 rotates in the direction of rotation o in order to roll in or flatten the curved part of the electrode tab 16A, 16B. The inclination direction of the electrode tab 16A, 16B coincides with the direction of rotation o of the press head 1000. In this embodiment, at least one of the electrode tabs 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B is inclined, their inclination direction corresponding to the direction of rotation o of the press head 1000. For example, in Fig. 11, both the electrode tab 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B are inclined, with the inclination directions of the two corresponding to the direction of rotation o of the press head 1000. By ensuring that the inclination direction of the electrode tab 16A, 16B matches the direction of rotation o of the press head 1000, damage to the electrode tab 16A, 16B during flattening, especially to the electrode tab 16A, 16B on the outer ring and on the end section of the winding structure 100, can be avoided and the yield of the winding structure 100 can be improved. In some embodiments, the direction of rotation o of the press head 1000, as shown in Fig. 11, is opposite to the winding direction r of the winding structure. The inclination direction of the electrode tab 16A, 16B coincides with the direction of rotation o of the press head 1000 and is opposite to the winding direction r of the winding structure. This prevents the electrode tab 16A, 16B from kinking or breaking when the electrode sheet 10A, 10B is wound on, and also avoids damage to the electrode tab 16A, 16B when it is flattened, thereby improving the yield of the winding structure. Fig. 12 shows a schematic representation of an unfolded electrode sheet in some further embodiments of an electrode arrangement according to the present application. As shown in Fig. 12, according to some embodiments of the present application, a chamfer Q formed by corner cutting is provided on a side of the electrode tab 160A, 160B located near the end, which is situated at the end section of the winding structure. For example, when cutting off the end section of the wound electrode sheet 10A, 10B, the corner of the electrode tab 160A, 160B located near the end can be cut off directly at the end section, thereby creating a chamfer Q at the end of the electrode tab. In this embodiment, at least one of the electrode tabs 160A of the first electrode sheet 10A at the end section of the winding structure and the electrode tab 160B of the second electrode sheet 10B at the end section of the winding structure are provided with a chamfer Q. For example, the electrode tab 160A of the first electrode sheet 10A at the end section of the winding structure can be provided with a chamfer Q, or the electrode tab 160B of the second electrode sheet 10B at the end section of the winding structure can be provided with a chamfer Q, or both the electrode tab 160A of the first electrode sheet 10A and the electrode tab 160B of the second electrode sheet 10B at the end section of the winding structure can be provided with a chamfer Q. As shown in Fig. 11, when cutting off the end section of the wound electrode sheet, the unknown cutting position can result in the last electrode tab 16A, 16B having an insufficient width in the interrupted area. This, in turn, can lead to problems such as detachment, breakage, or lifting of the electrode tab at the end section. To remedy these problems, in this embodiment, the electrode tab at the end section is punched in such a way that its corner portion is removed. As shown in Fig. 12, according to some embodiments of the present application, at least a part of the chamfer Q of the electrode tab 160A, 160B at the end section of the winding structure is formed in an arc shape. For example, in some embodiments, the corner part of the electrode tab 160A, 160B at the end section of the electrode sheet is machined by arc-shaped cutting to form an arc-shaped chamfer Q. In this embodiment, at least one of the electrode tabs 160A of the first electrode sheet 10A at the end section of the winding structure and the electrode tab 160B of the second electrode sheet 10B at the end section of the winding structure are provided with an arc-shaped chamfer Q. For example, the electrode tab 160A of the first electrode sheet 10A at the end section of the winding structure can be provided with an arc-shaped chamfer Q, or the electrode tab 160B of the second electrode sheet 10B at the end section of the winding structure can be provided with an arc-shaped chamfer Q, or both the electrode tab 160A of the first electrode sheet 10A and the electrode tab 160B of the second electrode sheet 10B at the end section of the winding structure can be provided with an arc-shaped chamfer Q. Through experimental analyses, the applicants of the present application have found that punching the electrode tab at the end section of the electrode sheet to form an arc-shaped chamfer can more effectively prevent problems such as detachment, breakage or lifting of the electrode tab at the end section and further improve the yield of the winding structure. Naturally, the chamfer formed by punching the corner part of the electrode tab is not limited to arc-shaped designs. For example, it can also be straight. According to some embodiments of the present application, a device for forming electrode tabs is further provided. As shown in Fig. 11, the device for forming electrode tabs comprises a press head 1000. The press head 1000 serves to smooth an electrode tab 16A, 16B in an electrode arrangement according to one of the above embodiments, such that at least a part of the electrode tab 16A, 16B is bent and flattened relative to a current collector. According to some embodiments of the present application, the bent part of the electrode tab 16A, 16B is bent and flattened by the rotary pressing of the press head 1000. According to some embodiments of the present application, the electrode tab 16A, 16B is inclined relative to a side of the current collector extending along the winding direction r. As shown in Fig. 11, the press head 1000 rotates in the direction of rotation o to roll in or flatten the curved part of the electrode tab 16A, 16B, the direction of rotation o of the press head 1000 being designed to coincide with the direction of inclination of the electrode tab 16A, 16B. By ensuring that the direction of rotation o of the press head 1000 matches the direction of inclination of the electrode tab 16A, 16B, damage to the electrode tab 16A, 16B during flattening, in particular to the electrode tab 16A, 16B on the outer ring and on the end section of the winding structure 100, can be avoided and the yield of the winding structure 100 can be improved. Of course, the device for forming electrode tabs provided in the present application may also include other structures, such as a drive mechanism for driving the press head, which is not limited in this embodiment. According to some embodiments of the present application, a battery cell is further provided which comprises an electrode arrangement according to one of the above embodiments. Fig. 2B, for example, shows a schematic representation of the interconnection structure of several battery cells 20, each battery cell 20 comprising an electrode arrangement described in one of the above embodiments. Or, for example, the electrode arrangement 22 in the battery cell 20 shown in Fig. 3 is the electrode arrangement described in one of the above embodiments. The battery cell having the above electrode arrangement exhibits improved performance, is, for example, safer, and has a higher product yield. According to some embodiments of the present application, at least a portion of the electrode tab is bent and flattened relative to the current collector, with the maximum distance between the bend line and the tip of the electrode tab being designated h2. The winding structure is a cylindrical winding structure. The electrode arrangement also includes a current collector disk located on one side of the cylindrical winding structure, which is connected to the electrode tab section and is firmly joined to the bent portion of the electrode tab by welding. In Fig. 7, for example, the winding structure 100 is a cylindrical winding structure. The two ends of the winding structure 100 are provided with an electrode tab section 13A and an electrode tab section 13B, respectively, and the electrode tab section 13A and the electrode tab section 13B are each welded to the current collector disk 230 after rolling or smoothing. As shown in Fig. 7, the reference numeral 231 designates a welding area 231 on the current collector disk 20. As shown in Fig. 7, in some embodiments the thickness of the current collecting disk 20 is designated as t1 and the height of the curved part of the electrode tab as h2, where for t1 and h2: 0.05 ≤ t1 / h2 ≤ 0.2. In this embodiment, the dimension of the bent part of the electrode tab of at least one of the electrode sheets 10A and 10B satisfies the above formula. For example, the dimension of the bent part of the electrode tab 16A of the first electrode sheet 10A can satisfy the above dimension, or the dimension of the bent part of the electrode tab 16B of the second electrode sheet 10B can satisfy the above dimension, or both the bent part of the electrode tab 16A of the first electrode sheet 10A and the bent part of the electrode tab 16B of the second electrode sheet 10B can satisfy the above dimension. Through analysis, the applicants of the present application have found that if t1 / h2 < 0.05, the height of the bent part is too large. This leads to an excessive thickness of the dense layer formed by flattening the electrode tab, resulting in a reduction of the battery capacity. If t1 / h2 > 0.2, the height of the bent part is too small, resulting in an insufficient thickness of the dense layer formed by flattening. This does not meet the welding conditions and can easily lead to problems such as burn-through. The ratio disclosed in this embodiment between the height of the bent part of the electrode tab and the thickness of the current collector disk can ensure that the thickness of the dense layer formed by flattening the electrode tab meets the welding conditions while simultaneously increasing the battery capacity. As shown in Fig. 2A, according to some embodiments of the present application, a battery 30 is further provided which comprises a battery cell 20 according to one of the above embodiments. The battery 30, which has the above battery cell 20, exhibits improved performance, is, for example, safer and has a higher product yield. As shown in Fig. 1, according to some embodiments of the present application, a power-consuming device is provided which includes a battery 30 according to one of the above embodiments. The power-consuming device can be one of the above-mentioned devices that requires a battery, such as a power-consuming appliance or an energy storage device. The power-consuming device in Fig. 1, for example, is a vehicle. The power-consuming device that incorporates the above battery offers improved performance and is, for example, safer and more reliable. As shown in Fig. 4, the electrode arrangement according to some embodiments of the present application comprises a first electrode sheet 10A and a second electrode sheet 10B having opposite polarities, and a separator film 10C arranged between the first electrode sheet 10A and the second electrode sheet 10B. The first electrode sheet 10A, the separator film 10C, and the second electrode sheet 10B are wound along a winding direction r to form a winding structure 100. The first electrode sheet 10A is a negative electrode sheet, and the second electrode sheet 10B is a positive electrode sheet with opposite polarity to the first electrode sheet 10A. The winding structure 100 is a cylindrical winding structure formed by winding. As shown in Figs. 5, 8, and 9, the first electrode sheet 10A comprises a current collector 17A (i.e., a negative electrode current collector), an active substance layer 12A (i.e., a negative electrode active substance layer), and an electrode tab section 11A (i.e., a negative electrode tab section). It also comprises an insulating layer 13A (such as a ceramic insulating layer) that covers the surface of the current collector 17A and is located on one side of the active substance layer 12A near the electrode tab section 11A. The electrode tab section 11A is connected to a side of the current collector 17A that runs along the winding direction r.The electrode tab section 11A has a continuous area 15A located near the active substance layer and a discontinuous area 14A located away from the active substance layer, the discontinuous area 14A comprising several electrode tabs 16A spaced apart along the winding direction r. The second electrode sheet 10B comprises a current collector 17B (i.e., a positive electrode current collector), an active substance layer 12B (i.e., a positive electrode active substance layer), and an electrode tab section 11B (i.e., a positive electrode tab section). The electrode tab section 11B is connected to a side of the current collector 17B extending along the winding direction r. The electrode tab section 11B has a continuous region 15B located near the active substance layer and a discontinuous region 14B located away from the active substance layer, the discontinuous region 14B comprising several electrode tabs 16B spaced apart along the winding direction r. As shown in Figs. 6 and 7, the electrode tab section 11A of the first electrode sheet 10A and the electrode tab section 11B of the second electrode sheet 10B protrude from both ends of the winding structure 100. The electrode tab 16A of electrode tab section 11A and the electrode tab 16B of electrode tab section 11B can be pressed and flattened by a press head 1000, for example by rolling or smoothing. The flattened electrode tabs 16A and 16B are each welded to the current collector disk 230. The electrode tab section 11A of the first electrode sheet 10A and the electrode tab section 11B of the second electrode sheet 10B satisfy the following dimensional specifications: As shown in Fig. 8, in the axial direction of the winding structure, the height h0 of the electrode tab section with undistorted electrode tabs, the height h1 of the undistorted electrode tab section, and the height h2 of the part of the electrode tab section used for bending and flattening satisfy the following conditions: for h0, 4 mm ≤ h0 ≤ 7 mm; for h1, 2 mm ≤ h1 ≤ 7 mm; for h2, 2 mm ≤ h2 ≤ 7 mm, where 0.25 ≤ h1 / h0 < 1 and 0.3 ≤ h2 / h1 ≤ 1. Furthermore, as shown in Fig. 10 and Fig. 11, the electrode tab 16A of the first electrode sheet 10A and the electrode tab 16B of the second electrode sheet 10B are inclined, the inclination satisfying the following conditions: The inclination direction is opposite to the winding direction r of the winding structure and coincides with the direction of rotation o of the press head 1000, and for the inclination angle θ: 45° ≤ θ < 90°. Finally, it should be noted that the above embodiments serve only to illustrate the technical solutions of the present application and do not limit them. Although the present application has been described in detail with reference to the above embodiments, it should be clear to those skilled in the art that the technical solutions described in the above embodiments can be modified or some or all of the technical features can be replaced by equivalent features without such modifications or replacements altering the essential character of the corresponding technical solutions beyond the scope of the technical solutions of the embodiments of the present application, and all of them should fall within the scope of the claims and the description of the present application.In particular, the technical features described in the individual embodiments can be combined with one another in any way, provided there are no structural contradictions. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions that fall within the scope of the claims.

Claims

Electrode arrangement comprising: a first electrode sheet (10A) and a second electrode sheet (10B) having opposite polarities, and a separator film (10C) arranged between the first electrode sheet (10A) and the second electrode sheet (10B), wherein the first electrode sheet (10A), the separator film (10C) and the second electrode sheet (10B) are wound along a winding direction (r) to form a winding structure (100); wherein at least one of the first electrode sheet (10A) and the second electrode sheet (10B) comprises: a current collector (17A; 17B); an active substance layer (12A; 12B) arranged at least on the surface of one side of the current collector (17A; 17B) near the separator film (10C); and an electrode tab section (11A; 11B) which is connected to a side of the current collector (17A; 17B) extending along the winding direction r, wherein the electrode tab section (11A;11B) has a continuous region (15A; 15B) located near the active substance layer (12A; 12B) and a discontinuous region (14A; 14B) located away from the active substance layer (12A; 12B), wherein the discontinuous region (14A; 14B) comprises several electrode tabs (16A; 16B) spaced apart along the winding direction (r). Electrode arrangement according to claim 1, wherein in the axial direction of the winding structure (100) the height of the electrode tab section (11A; 11B) with unbent electrode tabs (16A; 16B) is designated as h0 and the height of the unbent electrode tab (16A; 16B) is designated as h1, wherein for h0 and h1: 0.25 ≤ h1 / h0 < 1. Electrode arrangement according to claim 2, wherein 0.4 ≤ h1 / h0 ≤ 0.

8. Electrode arrangement according to one of claims 1 to 3, wherein at least a part of the electrode tab (16A; 16B) is bent and flattened relative to the current collector (17A; 17B), wherein the maximum distance between the bend line (S) and the tip of the electrode tab is referred to as h2, and in the axial direction of the winding structure (100) the height of the undistorted electrode tab (16A; 16B) is referred to as h1, wherein for h1 and h2: 0.3 ≤ h2 / h1 ≤ 1. Electrode arrangement according to one of claims 1 to 4, wherein the winding structure (100) is a cylindrical winding structure, wherein the diameter of the central cylinder of the winding structure (100) is referred to as d and the width of the electrode tab (16A; 16B) is referred to as l, wherein for l and d: 0.7 ≤ l / d ≤ 2. Electrode arrangement according to one of claims 1 to 5, wherein the maximum distance between adjacent electrode tabs (16A; 16B) in the electrode tab section (11A; 11B) is designated as g and the width of the electrode tab (16A; 16B) as l, wherein for l and g: g / l ≤ 0.

2. Electrode arrangement according to one of claims 1 to 6, wherein in the axial direction of the winding structure (100) the height h0 of the electrode tab section (11A; 11B) with unbent electrode tabs (16A; 16B) is: 3 mm ≤ h0 ≤ 8 mm, and / or the height h1 of the unbent electrode tab (16A; 16B) is: 1 mm ≤ h1 ≤ 8 mm, and / or at least a part of the electrode tab (16A; 16B) is bent and flattened relative to the current collector (17A; 17B), wherein the maximum distance h2 between the bending line (S) and the tip of the electrode tab (16A; 16B) is: 1 mm ≤ h2 ≤ 8 mm. Electrode arrangement according to claim 7, wherein the height h0 is: 4 mm ≤ h0 ≤ 7 mm, and / or the height h1 is: 2 mm ≤ h1 ≤ 7 mm, and / or the distance h2 is: 2 mm ≤ h2 ≤ 7 mm. Electrode arrangement according to one of claims 1 to 8, wherein the electrode tab (16A; 16B) is inclined relative to a side of the current collector (17A; 17B) extending along the winding direction (r), preferably wherein the inclination direction of the electrode tab (16A; 16B) is opposite to the winding direction (r), particularly preferably wherein at least a part of the electrode tab (16A; 16B) is bent and flattened relative to the current collector (17A; 17B), wherein the bent part of the electrode tab (16A; 16B) is bent by the rotary pressing of a press head (1000), and the inclination direction of the electrode tab (16A; 16B) coincides with the direction of rotation (o) of the press head (1000). Electrode arrangement according to claim 9, wherein the inclination angle θ of the electrode tab (16A; 16B) is: 45° ≤ θ < 90°. Electrode arrangement according to one of claims 1 to 10, wherein a chamfer (Q) formed by corner cutting is provided on a side of the electrode tab (160A; 160B) located near the end, which is located on the end section of the winding structure (100), preferably wherein at least a part of the chamfer (Q) is arc-shaped. Battery cell comprising: an electrode arrangement according to any one of claims 1 to 11, preferably wherein at least a part of the electrode tab (16A; 16B) is bent and flattened relative to the current collector (17A; 17B), wherein the maximum distance between the bend line (S) and the tip of the electrode tab is designated as h2, the winding structure (100) is a cylindrical winding structure, the battery cell also comprises a current collector disk (230) located on one side of the cylindrical winding structure (100) which is connected to the electrode tab section (11A; 11B) and is firmly connected to the bent part of the electrode tab (16A; 16B) by welding, wherein the thickness of the current collector disk (230) is designated as t1, wherein for t1 and h2: 0.05 ≤ t1 / h2 ≤ 0.

2. Battery comprising a battery cell according to claim 12. Power-consuming device comprising a battery according to claim 13. Device for forming electrode tabs, comprising a press head (1000), wherein the press head (1000) serves to smooth an electrode tab (16A; 16B) in an electrode arrangement according to one of claims 1 to 11, such that at least a part of the electrode tab (16A; 16B) is bent and flattened relative to the current collector (17A; 17B), preferably wherein the electrode tab (16A; 16B) is inclined relative to a side of the current collector (17A; 17B) extending along the winding direction (r); the direction of rotation (o) of the press head (1000) is designed to coincide with the direction of inclination of the electrode tab (16A; 16B).

Images