Winding type electrode assembly, battery monomer, battery and electric equipment

Abstract

The utility model relates to a winding type electrode assembly, a battery monomer, a battery and electric equipment, and belongs to the technical field of battery manufacturing. The winding type electrode assembly comprises a first pole piece, the first pole piece comprises a plurality of first tabs, the first tabs are stacked after the first pole piece is wound, the widths of the first tabs are gradually increased from the inner ring to the outer ring of the first pole piece, the height of a first tab 1211 is H1, the width of the root of the first tab 1211 is L1, and H1 / L1 is larger than 0.3 and smaller than 1. After the winding type electrode assembly forms a battery monomer, the service life of the battery monomer can be prolonged.

Description

[0001] Cross - Reference to Related Applications

[0002] This application claims the priority of Chinese Patent Application No. 202210057806.9, titled "Wound Electrode Assembly, Battery Cell, Battery and Electrical Equipment", filed on January 19, 2022, the entire content of which is incorporated herein by reference. Technical Field

[0003] This application relates to the technical field of battery manufacturing, and more particularly, to a wound electrode assembly, a battery cell, a battery and an electrical equipment. Background Art

[0004] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, battery technology is an important factor related to their development.

[0005] In the development of battery technology, in addition to improving the energy density of the battery, the service life of the battery is also an issue that cannot be ignored. Therefore, how to improve the service life of the battery is an urgent technical problem in battery technology. Summary of the Invention

[0006] The purpose of this application is to provide a wound electrode assembly, a battery cell, a battery and an electrical equipment. After forming a battery cell, the wound electrode assembly can improve the service life of the battery cell.

[0007] This application is achieved by the following technical solutions:

[0008] In a first aspect, this application provides a wound electrode assembly, including a first electrode tab. The first electrode tab includes a plurality of first tab ears, and the plurality of first tab ears are stacked after the first electrode tab is wound. The widths of the plurality of first tab ears gradually increase from the inner circle to the outer circle of the first electrode tab; the height of the first tab ear is H1, and the width of the root of the first tab ear is L1, satisfying 0.3 < H1 / L1 < 1.

[0009] For the wound electrode assembly according to the embodiments of the present application, after the first electrode sheet is wound, a plurality of first electrode tabs are stacked in sequence from the inner circle to the outer circle of the first electrode sheet, and the widths of the plurality of first electrode tabs gradually increase from the inner circle to the outer circle of the first electrode sheet. Even if the outer first electrode tab is misaligned during the winding process, the plurality of first electrode tabs still have a large overlapping area in the stacking direction from the inner circle to the outer circle of the first electrode sheet; when the wound electrode assembly is assembled into a battery cell, it is necessary to connect the first electrode tab to a connecting member. To ensure connection to each first electrode tab, the connecting member is connected to the first electrode tab in the overlapping area of the plurality of first electrode tabs. Since the plurality of first electrode tabs have a large overlapping area, the influence of the misalignment of the first electrode tab on the connection area is reduced, it can be ensured that the first electrode tab and the connecting member have a large connection area, the connection reliability between the first electrode tab and the connecting member is improved, the overcurrent capacity is ensured, and thus the service life of the battery cell is improved. In addition, increasing the width of the first electrode tab can also reduce the probability of the first electrode tab folding during winding, so as to improve the safety of the battery cell formed by the wound electrode assembly. The relationship between the height of the first electrode tab and the width of the root of the first electrode tab satisfies 0.3 < H1 / L1 < 1, which can ensure that the first electrode tab 1211 is not easily folded, and can also ensure that the first electrode tab 1211 does not interfere with other components (such as insulating parts), so as to ensure safety. When the height of the first electrode tab is certain, the larger the width of the root of the first electrode tab, the less likely the first electrode tab is to fold during winding, ensuring that the battery cell formed by the wound electrode assembly has high safety. If the width of the root of the first electrode tab is too large, the first electrode tab is likely to interfere with other components (such as insulating parts); if the width of the root of the first electrode tab is too small, during the conveying process of the first electrode sheet, the reverse force of the first electrode tab passing over the roller is large, then the first electrode tab is easily folded, and the folded first electrode tab will affect the safety of the battery cell formed by the wound electrode assembly.

[0010] According to some embodiments of the present application, among the plurality of first electrode tabs, the projection of the innermost first electrode tab on a preset plane is located within the projection of the outermost first electrode tab on the preset plane, and the preset plane is perpendicular to the stacking direction of the plurality of first electrode tabs.

[0011] In the above solution, among the plurality of first electrode tabs, the projection of the innermost first electrode tab on a preset plane is located within the projection of the outermost first electrode tab on the preset plane. Even if the first electrode tab is misaligned during winding, the projection of the innermost first electrode tab on the preset plane is still located within the projection of the outermost first electrode tab on the preset plane, and the overlapping area between the innermost first electrode tab and the outermost first electrode tab remains unchanged, ensuring that both the innermost first electrode tab and the outermost first electrode tab can be connected to the connecting member, and further ensuring that the plurality of first electrode tabs and the connecting member have a large connection area.

[0012] According to some embodiments of the present application, among two adjacent first tabs, the projection of the inner first tab on the preset plane is located within the projection of the outer first tab on the preset plane.

[0013] In the above solution, among two adjacent first tabs, the projection of the inner first tab is located within the projection of the outer first tab, so that the overlapping area of any two adjacent first tabs remains unchanged. When winding, the misalignment of the first tabs does not affect the connection area between the multiple first tabs and the connecting member, ensuring a high connection reliability between the multiple first tabs and the connecting member.

[0014] According to some embodiments of the present application, the width difference between every two adjacent first tabs is equal.

[0015] In the above solution, among the multiple first tabs, the width gradient law of any two adjacent first tabs is the same, which is convenient for processing and manufacturing.

[0016] According to some embodiments of the present application, the first pole piece further includes a first main body portion. The first tab protrudes from a first edge of the first main body portion. The first tab includes two second edges oppositely arranged along its width direction. The included angle between the second edge and the first edge is R, satisfying 90° < R < 120°.

[0017] In the above solution, the included angle R between the second edge and the first edge determines the edge inclination degree of the first tab. The above angle range ensures both a large connection area between the first tab and the connecting member and that the first tab is not easily folded. If the included angle R is too small, the first tab is easily folded; if the included angle R is too large, the connection area between the first tab and the connecting member is reduced, affecting the connection reliability between the first tab and the connecting member.

[0018] According to some embodiments of the present application, the wound electrode assembly further includes a second pole piece having a polarity opposite to that of the first pole piece. The second pole piece includes a plurality of second tabs. The plurality of second tabs are stacked after the second pole piece is wound. The widths of the plurality of second tabs gradually increase from the inner circle to the outer circle of the second pole piece.

[0019] In the above solution, the second tabs of the second pole piece have the same structure as the first tabs, ensuring the connection reliability between the second tabs and another connecting member, thereby improving the service life of the battery cell. The widths of the plurality of second tabs gradually increase from the inner circle to the outer circle of the second pole piece, making the second tabs not easily folded and improving the safety of the battery cell.

[0020] In a second aspect, the present application provides a battery cell, including: a housing; and the wound electrode assembly in the above embodiments, where the wound electrode assembly is disposed within the housing.

[0021] For a battery cell according to an embodiment of the present application, since the width of the first tab of the wound electrode assembly gradually increases from the inner circle to the outer circle in the stacking direction, even if the first tab is misaligned during winding, there is still a large contact area between the plurality of first tabs and the connecting member, ensuring the connection reliability between the first tab and the connecting member and improving the service life of the battery cell.

[0022] According to some embodiments of the present application, the housing includes a housing body and an end cap. The housing body has an opening, and the wound electrode assembly is disposed inside the housing body. The end cap is used to cover the opening. The battery cell further includes: an insulating member disposed between the end cap and the wound electrode assembly for insulating and isolating the end cap from the first tab. Wherein, a first protrusion is provided on a side of the insulating member facing the wound electrode assembly, and the first protrusion abuts against the wound electrode assembly. The first protrusion is provided with a first avoidance portion for avoiding the plurality of first tabs.

[0023] In the above solution, by abutting the first protrusion against the wound electrode assembly, the movement of the wound electrode assembly inside the housing is restricted to position the wound electrode assembly; by avoiding the plurality of first tabs through the first avoidance portion, interference between the first tabs and the first protrusion can be avoided, ensuring the assembly accuracy.

[0024] In a third aspect, the present application provides a battery including the battery cell as in the above embodiment.

[0025] In a fourth aspect, the present application provides an electrical device including the battery as in the above embodiment, and the battery is used to provide electrical energy.

[0026] In a fifth aspect, the present application provides a manufacturing method of a battery cell, which includes: providing a housing; providing a wound electrode assembly, the wound electrode assembly including a first electrode tab, the first electrode tab including a plurality of first tabs, the plurality of first tabs being stacked after the first electrode tab is wound, the widths of the plurality of first tabs gradually increasing from the inner circle to the outer circle of the first electrode tab, the height of the first tab being H1, and the width of the root of the first tab being L1, satisfying 0.3 < H1 / L1 < 1; and disposing the wound electrode assembly inside the housing.

[0027] Sixth aspect, the present application provides a manufacturing device for a battery cell, which includes: a providing module for providing a housing and a wound electrode assembly, the wound electrode assembly includes a first electrode tab, the first electrode tab includes a plurality of first tab ears, the plurality of first tab ears are stacked after the first electrode tab is wound, the widths of the plurality of first tab ears gradually increase from the inner circle to the outer circle of the first electrode tab, the height of the first tab ear is H1, the width of the root of the first tab ear is L1, and 0.3 < H1 / L1 < 1; an assembling module for disposing the wound electrode assembly in the housing.

[0028] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without creative efforts.

[0030] Figure 1 Schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0031] Figure 2 Explosion view of a battery provided in some embodiments of the present application;

[0032] Figure 3 Explosion view of a battery cell provided in some embodiments of the present application;

[0033] Figure 4 Axonometric view of a wound electrode assembly provided in some embodiments of the present application;

[0034] Figure 5 Front view of a wound electrode assembly provided in some embodiments of the present application;

[0035] Figure 6 Top view of a wound electrode assembly provided in some embodiments of the present application;

[0036] Figure 7 Schematic diagram of the unfolded state of the first electrode tab of a wound electrode assembly provided in some embodiments of the present application;

[0037] Figure 8 Partial schematic diagram of a first electrode tab provided in some embodiments of the present application;

[0038] Figure 9 Schematic diagram of the assembly process of a battery cell provided in some embodiments of the present application;

[0039] Figure 10 Partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0040] Figure 11 Schematic diagram of the structure of an insulating member provided in some embodiments of the present application;

[0041] Figure 12 Schematic diagram of the assembly process of a battery cell when the tabs are misaligned, provided in some embodiments of the present application;

[0042] Figure 13 Schematic flow chart of the manufacturing method of a battery cell provided in some embodiments of the present application;

[0043] Figure 14 Schematic block diagram of the manufacturing equipment of the battery cell 10 provided in some embodiments of the present application.

[0044] In the drawings, the drawings are not drawn to actual scale.

[0045] Marking description: 100 - battery; 101 - box body; 1011 - first part; 1012 - second part; 10 - battery cell; 11 - outer shell; 111 - housing; 112 - end cap; 12 - wound electrode assembly; 121 - first electrode tab; 1211 - first tab; 1212 - first main body part; 1213 - first edge; 1214 - second edge; 122 - second electrode tab; 1221 - second tab; 13 - insulating member; 131 - first protrusion; 1311 - first avoidance part; 1312 - second avoidance part; 141 - first connecting member; 142 - second connecting member; 151 - first electrode terminal; 152 - second electrode terminal; P1 - first connection area; P2 - second connection area; 200 - controller; 300 - motor; 1000 - vehicle. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application pertains; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims, or drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0048] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0051] The term "plurality" as used in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0052] In this application, the battery mentioned refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in this application can include a battery module or a battery pack, etc.

[0053] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the coated positive active material layer protrudes from the positive current collector with the coated positive active material layer. The positive current collector without the coated positive active material layer serves as the positive electrode ear. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the coated negative active material layer protrudes from the negative current collector with the coated negative active material layer. The negative current collector without the coated negative active material layer serves as the negative electrode ear. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that large currents can pass through without fusing, the number of positive electrode ears is multiple and they are stacked together, and the number of negative electrode ears is multiple and they are stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. The electrode assembly mentioned in the embodiments of the present application is a wound structure.

[0054] The battery cell further includes a connection member, or can also be called a current collecting member, for electrically connecting with the electrode ears of the electrode assembly.

[0055] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0056] The development of battery technology needs to consider various design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered.

[0057] For a battery cell, the main reliability factor is the connection reliability between the tab of the electrode assembly and the connection member. To ensure the connection reliability between the tab and the connection member, the tab and the connection member are usually welded. However, the inventor found that multiple tabs of the wound electrode assembly are prone to dislocation after winding. The multiple dislocated tabs have a small connection area with the connection member, resulting in poor connection reliability between the tab and the connection member. Specifically, when welding multiple tabs and the connection member, if each tab needs to be welded, the multiple tabs need to be overlapped and the connection member is welded to the overlapping area of the multiple tabs. Since the tabs are prone to dislocation during winding, the overlapping area of the multiple tabs is small, resulting in a small welding area, a weak connection part between the tab and the connection member, a small overcurrent area, poor connection reliability, easy damage, easy fusing, and affecting the service life of the battery cell; or, there may be partial virtual welding of some tabs, resulting in a reduced overcurrent area.

[0058] In view of this, to solve the problem of poor connection reliability between the tab and the connection member, the inventor conducted in-depth research and designed a wound electrode assembly. The wound electrode assembly includes a first electrode tab, and the first electrode tab includes multiple first tabs. The multiple first tabs are stacked after the first electrode tab is wound, and the widths of the multiple first tabs gradually increase from the inner circle to the outer circle of the first electrode tab. By increasing the width of the outer first tab, the dislocation amount of the outer first tab is compensated to ensure that the multiple first tabs have a large overlapping area.

[0059] In a battery cell composed of such a wound electrode assembly, even if the outer first tab is dislocated during the winding process, the multiple first tabs still have a large overlapping area. During the assembly process of the battery cell, the connection member is connected to the overlapping area of the multiple first tabs, reducing the influence of the first tab dislocation on the connection area, ensuring that the first tab and the connection member have a large connection area, improving the connection reliability between the first tab and the connection member, and also ensuring the overcurrent capacity, thereby improving the service life of the battery cell. In addition, increasing the width of the first tab can also reduce the probability of the first tab folding during winding, improving the safety of the battery cell composed of the wound electrode assembly.

[0060] The battery cell disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. A power supply system of the power-consuming device can be composed of the battery cell, battery, etc. disclosed in the present application.

[0061] Embodiments of the present application provide an electrical device using a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, and the like.

[0062] For the convenience of description, the following embodiments take a vehicle 1000, which is an electrical device according to an embodiment of the present application, as an example for illustration.

[0063] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of the vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, or the like. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000. For example, the battery 100 may be used as an operating power source of the vehicle 1000 and be used for the electrical system of the vehicle, such as for the working power requirements during the startup, navigation, and operation of the vehicle.

[0064] The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the startup, navigation, and driving of the vehicle 1000.

[0065] In some embodiments of the present application, the battery 100 may not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 , Figure 2Exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a box body 101 and battery cells 10, and the battery cells 10 are accommodated in the box body 101. Among them, the box body 101 is used to provide an accommodation space for the battery cells 10, and the box body 101 can adopt various structures. In some embodiments, the box body 101 may include a first part 1011 and a second part 1012, the first part 1011 and the second part 1012 cover each other, and the first part 1011 and the second part 1012 jointly define an accommodation space for accommodating the battery cells 10. The second part 1012 may be a hollow structure with one end open, and the first part 1011 may be a plate-like structure. The first part 1011 covers the open side of the second part 1012 so that the first part 1011 and the second part 1012 jointly define an accommodation space; the first part 1011 and the second part 1012 may also both be hollow structures with one side open, and the open side of the first part 1011 covers the open side of the second part 1012. Of course, the box body 101 formed by the first part 1011 and the second part 1012 can be of various shapes, such as a cylinder, a cuboid, etc.

[0067] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 10 is accommodated in the box body 101; of course, the battery 100 can also be that multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 101. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 10.

[0068] Among them, each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but not limited thereto. The battery cell 10 provided by the embodiments of the present application is in a cube shape.

[0069] Please refer to Figure 3 , Figure 3 Exploded view of the battery cell 10 provided by some embodiments of the present application. The battery cell 10 refers to the smallest unit that makes up the battery 100. As Figure 3 shown, the battery cell 10 includes a housing 11, a wound electrode assembly 12, a connecting member, and other functional components.

[0070] The outer shell 11 is a component for forming the internal environment of the battery cell 10, and the formed internal environment can be used to accommodate the wound electrode assembly 12, the electrolyte, and other components. The outer shell 11 may include a housing 111 and an end cap 112. The housing 111 and the end cap 112 may be independent components, or an opening may be provided on the housing 111, and the end cap 112 may be covered at the opening to form the internal environment of the battery cell 10. Without limitation, the end cap 112 and the housing 111 may also be integrated. Specifically, the end cap 112 and the housing 111 may first form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 111, the end cap 112 is then covered on the housing 111. The housing 111 may be rectangular parallelepiped-shaped. Specifically, the shape of the housing 111 may be determined according to the specific shape and size of the wound electrode assembly 12. The material of the housing 111 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereto.

[0071] The end cap 112 refers to a component that covers the opening of the housing 111 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 112 may be adapted to the shape of the housing 111 to cooperate with the housing 111. Optionally, the end cap 112 may be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 112 is not easily deformed when being squeezed or collided, enabling the battery cell 10 to have higher structural strength and improved safety performance. Functional components such as electrode terminals may be provided on the end cap 112. The electrode terminals may be used for electrically connecting with the wound electrode assembly 12 to output or input the electric energy of the battery cell 10. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold may also be provided on the end cap 112. The material of the end cap 112 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereto. In some embodiments, an insulating member may also be provided on the inner side of the end cap 112, and the insulating member may be used to isolate the electrical connection components in the housing 111 from the end cap 112 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0072] The wound electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The housing 111 can contain one or more wound electrode assemblies 12. In the implementation of this application, the wound electrode assembly 12 is mainly formed by winding a positive electrode tab and a negative electrode tab, and a separator is usually provided between the positive electrode tab and the negative electrode tab. The portions of the positive electrode tab and the negative electrode tab with active materials constitute the main body of the wound electrode assembly 12, and the portions of the positive electrode tab and the negative electrode tab without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can 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 positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode lead-out components (such as electrode terminals, housing 111) to form an electric current loop.

[0073] The connecting member is a conductive component for connecting the electrode tab and the electrode lead-out component to achieve electrical connection between the electrode tab and the electrode lead-out component.

[0074] According to some embodiments of this application, refer to Figures 4 to 7 , Figure 4 is an axonometric view of the wound electrode assembly 12 provided by some embodiments of this application, Figure 5 is a front view of the wound electrode assembly 12 provided by some embodiments of this application, Figure 6 is a top view of the wound electrode assembly 12 provided by some embodiments of this application, Figure 7 is a schematic diagram of the unfolded state of the first electrode tab 121 of the wound electrode assembly 12 provided by some embodiments of this application. This application provides a wound electrode assembly 12, as Figures 4 to 7 shown, the wound electrode assembly 12 includes a first electrode tab 121, the first electrode tab 121 includes a plurality of first electrode tabs 1211, the plurality of first electrode tabs 1211 are stacked after the first electrode tab 121 is wound, and the widths of the plurality of first electrode tabs 1211 gradually increase from the inner circle to the outer circle of the first electrode tab 121.

[0075] The first electrode tab 121 is a component of the wound electrode assembly 12. The first electrode tab 121 includes a first current collector and a first active material layer, the first active material layer is coated on the surface of the first current collector, the first current collector without the first active material layer coated protrudes from the first current collector with the first active material layer coated, and the first current collector without the first active material layer coated serves as the first electrode tab 1211. The first electrode tab 121 can be a positive electrode tab or a negative electrode tab. When the first electrode tab 121 is a positive electrode tab, the first electrode tab 1211 is a positive electrode tab; when the first electrode tab 121 is a negative electrode tab, the first electrode tab 1211 is a negative electrode tab.

[0076] The first pole piece 121 includes a plurality of first tab ears 1211. During the winding process of the first pole piece 121, at least one first tab ear 1211 is provided in each turn of the first pole piece 121. The plurality of first tab ears 1211 are stacked after the first pole piece 121 is wound, that is, the plurality of first tab ears 1211 are sequentially stacked and distributed along the thickness direction of the wound electrode assembly 12.

[0077] In the figure, the dimension represented by the letter L is the width of the first tab ear 1211, the direction indicated by the letter X is the length direction of the first pole piece 121, and the direction indicated by the letter Y is the thickness direction of the wound electrode assembly 12. As Figure 6 and Figure 7 shown, the width L of the first tab ear 1211 refers to the dimension of the first tab ear 1211 in the length direction X of the first pole piece 121. For example, along the length direction X of the first pole piece 121, at the same position on one side edge of the first tab ear 1211, the distance from one side of the first tab ear 1211 to the other side of the first tab ear 1211.

[0078] The widths of the plurality of first tab ears 1211 gradually increase from the inner circle to the outer circle of the first pole piece 121, that is, as Figure 6 shown, in the stacking direction of the plurality of first tab ears 1211, the widths of the plurality of first tab ears 1211 show an increasing trend. The width of the first tab ear 1211 located in the innermost circle of the first pole piece 121 is the smallest, and the width of the first tab ear 1211 located in the outermost circle of the first pole piece 121 is the largest.

[0079] For the wound electrode assembly 12 according to the embodiment of the present application, the plurality of first tab ears 1211 are stacked after the first pole piece 121 is wound, and the widths of the plurality of first tab ears 1211 gradually increase from the inner circle to the outer circle of the first pole piece 121. Even if the outer first tab ear 1211 is misaligned during the winding process, the plurality of first tab ears 1211 still have a large overlapping area in the stacking direction from the inner circle to the outer circle of the first pole piece 121; when the wound electrode assembly 12 is assembled into the battery cell 10, due to the large overlapping area of the plurality of first tab ears 1211, the influence of the misalignment of the first tab ears 1211 on the connection area is reduced, the connection area between the first tab ears 1211 and the connection member can be ensured to be large, the connection reliability between the first tab ears 1211 and the connection member is improved, and the overcurrent capacity can also be ensured, thereby improving the service life of the battery cell 10. In addition, the increase in the width of the first tab ear 1211 can also reduce the probability of the first tab ear 1211 being folded during winding, so as to improve the safety of the battery cell 10 formed by the wound electrode assembly 12.

[0080] According to some embodiments of the present application, optionally, as Figure 5 and Figure 6As shown, among the multiple first tab ears 1211, the projection of the innermost first tab ear 1211 on the preset plane is located within the projection of the outermost first tab ear 1211 on the preset plane, and the preset plane is perpendicular to the stacking direction of the multiple first tab ears 1211.

[0081] The preset plane is a plane perpendicular to the stacking direction of the multiple first tab ears 1211, and it is a reference plane for comparing the overlapping situation of the multiple first tab ears 1211.

[0082] The innermost first tab ear 1211 and the outermost first tab ear 1211 refer to the direction from the inner circle to the outer circle of the wound first tab 121 in the stacking direction of the multiple first tab ears 1211. The innermost first tab ear 1211 is closer to the innermost circle of the first tab 121 than the outermost first tab ear 1211, and the outermost first tab ear 1211 is closer to the outermost circle of the first tab 121 than the innermost first tab ear 1211.

[0083] The projection of the innermost first tab ear 1211 on the preset plane is located within the projection of the outermost first tab ear 1211 on the preset plane, that is, along the stacking direction of the multiple first tab ears 1211, on the preset plane, the projection of the innermost first tab ear 1211 and the projection of the outermost first tab ear 1211 have the largest overlapping area.

[0084] In this case, during the winding process of the first tab 121, even if the outermost first tab ear 1211 is misaligned, after winding is completed, when the multiple first tab ears 1211 are stacked, the projection of the innermost first tab ear 1211 on the preset plane is still located within the projection of the outermost first tab ear 1211 on the preset plane, and the overlapping area between the innermost first tab ear 1211 and the outermost first tab ear 1211 will not change, ensuring that both the innermost first tab ear 1211 and the outermost first tab ear 1211 can be connected to the connecting member, and further ensuring that the multiple first tab ears 1211 and the connecting member have a large connecting area.

[0085] According to some embodiments of the present application, optionally, among two adjacent first tab ears 1211, the projection of the inner first tab ear 1211 on the preset plane is located within the projection of the outer first tab ear 1211 on the preset plane.

[0086] The inner first tab ear 1211 and the outer first tab ear 1211 refer to two first tab ears 1211 in the direction from the inner circle to the outer circle of the first tab 121. The inner first tab ear 1211 is close to the inner circle of the first tab 121, and the outer first tab ear 1211 is close to the outer circle of the first tab 121.

[0087] Among two adjacent first tab ears 1211, the projection of the inner first tab ear 1211 on a preset plane is located within the projection of the outer first tab ear 1211 on the preset plane. That is, the overlapping area of any two adjacent first tab ears 1211 remains unchanged. When winding, the error of the first tab ear 1211 does not affect the connection area between the multiple first tab ears 1211 and the connecting member, ensuring a high connection reliability between the multiple first tab ears 1211 and the connecting member.

[0088] According to some embodiments of the present application, optionally, the width difference between every two adjacent first tab ears 1211 is equal.

[0089] The width difference between every two adjacent first tab ears 1211 is equal. That is, along the stacking direction of the multiple first tab ears 1211, the widths of the multiple first tab ears 1211 form an arithmetic progression with an increasing trend from the inner circle to the outer circle of the first tab 121. For example, along the stacking direction of the multiple first tab ears 1211, the width difference between the second first tab ear 1211 and the first first tab ear 1211 is n, the width difference between the third first tab ear 1211 and the second first tab ear 1211 is also n, and the width difference between the mth first tab ear 1211 and the (m - 1)th first tab ear 1211 is also n, where m is greater than 3, such as m being 4, 5, 6, 7, etc.

[0090] Among the multiple first tab ears 1211, the width gradual change rule of any two adjacent first tab ears 1211 is the same, which is convenient for processing and manufacturing.

[0091] Please refer to Figure 8 , Figure 8 which is a partial schematic diagram of the first tab 121 provided by some embodiments of the present application. According to some embodiments of the present application, optionally, the height of the first tab ear 1211 is H1, and the width of the root of the first tab ear 1211 is L1, satisfying 0.3 < H1 / L1 < 1.

[0092] In the figure, the direction indicated by the letter Z is the width direction of the first tab 121. The height H1 of the first tab ear 1211 refers to the dimension of the first tab ear 1211 in the width direction Z of the first tab 121 during the forming process of the first tab 121.

[0093] The first tab 121 further includes a first main body portion 1212. The first tab ear 1211 is connected to the first main body portion 1212. The root of the first tab ear 1211 refers to the part of the first tab ear 1211 used to connect to the first main body portion 1212, that is, the end of the first tab ear 1211 far from the connecting member. The width L1 of the root of the first tab ear 1211 refers to the dimension of the root of the first tab ear 1211 in the length direction of the first tab 121.

[0094] The relationship between the height H1 of the first tab 1211 and the width L1 of the root of the first tab 1211 satisfies 0.3 < H1 / L1 < 1, which can ensure that the first tab 1211 is not easily folded over and can also ensure that the first tab 1211 does not interfere with other components (such as insulating parts). When the height H1 of the first tab 1211 is fixed, the larger the width L1 of the root of the first tab 1211, the lower the reverse force of the first tab 1211 passing over the roller during the conveyance of the first electrode sheet 121, and the less likely the first tab 1211 is to be folded over, ensuring that the battery cell 10 formed by the wound electrode assembly 12 has a high level of safety. If the width L1 of the root of the first tab 1211 is too large, the first tab 1211 is likely to interfere with other components (such as insulating parts); if the width L1 of the root of the first tab 1211 is too small, the reverse force of the first tab 1211 passing over the roller is relatively large, and the first tab 1211 is likely to be folded over, affecting the safety of the battery cell 10 formed by the wound electrode assembly 12.

[0095] Optionally, the relationship between the height H1 of the first tab 1211 and the width L1 of the root of the first tab 1211 satisfies 0.4 < H1 / L1 < 0.7.

[0096] According to some embodiments of the present application, optionally, as Figure 8 shown, the first electrode sheet 121 further includes a first main body portion 1212, the first tab 1211 protrudes from a first edge 1213 of the first main body portion 1212, the first tab 1211 includes two second edges 1214 oppositely arranged along its width direction, and the angle R between the second edge 1214 and the first edge 1213 satisfies 90° < R < 120°.

[0097] The first tab 1211 protrudes from the first edge 1213 of the first main body portion 1212. During the forming process of the first electrode sheet 121, a die-cutting device (such as cutting methods using a blade, laser, etc.) cuts the first electrode sheet 121 to form the first tab 1211, and the first edge 1213 is a cutting edge.

[0098] The two second edges 1214 are oppositely arranged along the width direction of the first tab 1211, and the second edge 1214 is also a cutting edge.

[0099] The included angle R between the second edge 1214 and the first edge 1213 determines the edge inclination degree of the first tab 1211. The included angle R between the second edge 1214 and the first edge 1213 satisfies 90° < R < 120°, which not only ensures a large connection area between the first tab 1211 and the connecting member, but also ensures that the first tab 1211 is not easily folded. If the included angle R between the second edge 1214 and the first edge 1213 is too small, the first tab 1211 is easily folded. If the included angle R between the second edge 1214 and the first edge 1213 is too large, the connection area between the first tab 1211 and the connecting member is reduced, affecting the connection reliability between the first tab 1211 and the connecting member.

[0100] Optionally, the included angle R between the second edge 1214 and the first edge 1213 satisfies 100° < R < 110°.

[0101] According to some embodiments of the present application, optionally, as Figure 4 shown, the wound electrode assembly 12 further includes a second electrode tab 122 having a polarity opposite to that of the first electrode tab 121. The second electrode tab 122 includes a plurality of second tabs 1221. After the second electrode tab 122 is wound, the plurality of second tabs 1221 are stacked. The widths of the plurality of second tabs 1221 gradually increase from the inner circle to the outer circle of the second electrode tab 122.

[0102] The second electrode tab 122 is a conductive member having a polarity opposite to that of the first electrode tab 121. For the structure of the second electrode tab 122, refer to the structure of the first electrode tab 121.

[0103] The structure of the second tab 1221 is the same as that of the first tab 1211, which ensures the connection reliability between the second tab 1221 and another connecting member, thereby improving the service life of the battery cell 10. The widths of the plurality of second tabs 1221 gradually increase from the inner circle to the outer circle of the second electrode tab 122, making the second tabs 1221 not easily folded and improving the safety of the battery cell 10.

[0104] The second electrode tab 122 further includes a second main body portion. The second tab 1221 protrudes from the second main body portion, and its structural form is the same as that of the first tab protruding from the first main body portion 1212.

[0105] According to some embodiments of the present application, the present application further provides a battery cell 10, which includes a housing 11 and the wound electrode assembly 12 described in any of the above solutions. The wound electrode assembly 12 is disposed inside the housing 11.

[0106] The housing 11 is a hollow component, and its interior is used to accommodate the electrode assembly to protect the electrode assembly.

[0107] For the battery cell 10 according to the embodiments of the present application, since the width of the first tab 1211 of the wound electrode assembly 12 gradually increases from the inner circle to the outer circle in the stacking direction, even if the first tab 1211 is misaligned during winding, there is still a large contact area between the plurality of first tabs 1211 and the connecting member, ensuring the connection reliability between the first tab 1211 and the connecting member and improving the service life of the battery cell 10.

[0108] According to some embodiments of the present application, optionally, as Figure 3 shown, the wound electrode assembly 12 further includes a second electrode tab 122, and the second electrode tab 122 includes a plurality of second tabs 1221. The battery cell 10 further includes a first electrode terminal 151, a second electrode terminal 152, a first connecting member 141, and a second connecting member 142. The first electrode terminal 151 and the second electrode terminal 152 are both disposed on the end cap 112; the first tab 1211 is electrically connected to the first electrode terminal 151 through the first connecting member 141, and the second tab 1221 is electrically connected to the second electrode terminal 152 through the second connecting member 142. The first electrode terminal 151 and the second electrode terminal 152 are electrode lead-out members.

[0109] Please refer to Figures 9 - 11 , Figure 9 which is a schematic diagram of the assembly process of the battery cell 10 provided by some embodiments of the present application, Figure 9 showing a schematic diagram of the state where the tabs are connected to the connecting member. In the figure, the first tab 1211 is connected to the first connecting member 141, and the second tab 1221 is connected to the second connecting member 142. At this time, the wound electrode assembly 12 has not been placed into the housing 11 yet; Figure 10 which is a partial cross-sectional view of the battery cell 10 provided by some embodiments of the present application, Figure 11 which is a schematic structural diagram of the insulating member 13 provided by some embodiments of the present application.

[0110] According to some embodiments of the present application, optionally, as Figure 3 shown, the housing 11 includes a housing body 111 and an end cap 112. The housing body 111 has an opening, and the wound electrode assembly 12 is disposed inside the housing body 111; the end cap 112 is used to cover the opening. As Figure 3 , and Figures 9 - 11 shown, the battery cell 10 further includes an insulating member 13, and the insulating member 13 is disposed between the end cap 112 and the wound electrode assembly 12. The insulating member 13 is used for insulating and isolating the end cap 112 from the first tab 1211. Among them, a first protrusion 131 is provided on the side of the insulating member 13 facing the wound electrode assembly 12. The first protrusion 131 abuts against the wound electrode assembly 12, and the first protrusion 131 is provided with a first avoidance portion 1311 for avoiding the plurality of first tabs 1211.

[0111] The housing 111 has a hollow interior structure, and the opening is in communication with the interior space of the housing 111 to facilitate the entry of the wound electrode assembly 12 into the interior of the housing 111.

[0112] The end cap 112 covers the opening and is sealingly connected to the housing 111, so that the interior of the outer housing 11 is a sealed chamber, preventing the leakage of electrolyte or dust from entering the interior of the outer housing 11.

[0113] The insulating member 13 is an electrically insulating component, for example, it can be rubber, plastic (such as PET (Polyethyleneterephthalate), PP (polypropylene), etc.).

[0114] In some embodiments, the insulating member 13 is rectangular, the width direction of the insulating member 13 corresponds to the thickness direction Y of the wound electrode assembly 12, and the first protrusion 131 extends along the width direction of the insulating member 13.

[0115] The first protrusion 131 is located on the side of the insulating member 13 facing the wound electrode assembly 12, that is, the first protrusion 131 protrudes from the surface of the insulating member 13 facing the wound electrode assembly 12, and the first protrusion 131 is closer to the wound electrode assembly 12 than the surface.

[0116] The number of wound electrode assemblies 12 is multiple, and the tabs of each wound electrode assembly 12 are located on the same side of the wound electrode assembly 12. For example, as Figure 3 、 Figure 9 and Figure 10 shown, the number of wound electrode assemblies 12 is two, and the two wound electrode assemblies 12 are arranged in sequence along the thickness direction Y of the wound electrode assembly 12. The first tabs 1211 of the two wound electrode assemblies 12 are connected to the first connection member 141; the first protrusion 131 extends along the thickness direction Y of the wound electrode assembly 12. As Figure 11 shown, the first protrusion 131 has two first avoidance portions 1311, and the two first avoidance portions 1311 are located at both ends of the first protrusion 131 along the width direction of the insulating member 13, and the two first avoidance portions 1311 are respectively used to avoid the first tabs 1211 of the two electrode assemblies.

[0117] By abutting the first protrusion 131 against the wound electrode assembly 12, the movement of the wound electrode assembly 12 in the housing 111 is restricted, and the wound electrode assembly 12 is positioned; by avoiding the first tabs 1211 through the first avoidance portions 1311, interference between the first tabs 1211 and the first protrusion 131 can be avoided, ensuring the assembly accuracy.

[0118] According to some embodiments of the present application, optionally, in the embodiment where the wound electrode assembly 12 further includes a second electrode tab 122, asFigure 9 and Figure 11 As shown in Figure 11 , the first protrusion 131 is further provided with a second avoidance portion 1312 for avoiding a plurality of second tab ears 1221.

[0119] The second avoidance portion 1312 and the first avoidance portion 1111 are distributed on both sides of the first protrusion 131 along the length direction of the insulating member 13. That is, along the length direction of the insulating member 13, the first tab ear 1211 and the second tab ear 1221 are distributed on both sides of the first protrusion 131.

[0120] By avoiding a plurality of second tab ears 1221 through the second avoidance portion 1312, interference between the second tab ears 1221 and the first protrusion 131 can be avoided, ensuring the assembly accuracy.

[0121] According to some embodiments of the present application, optionally, as Figure 11 shown, a second protrusion 132 is further provided on the side of the insulating member 13 facing the wound electrode assembly 12. The second protrusion 132 is distributed at both ends of the insulating member 13 along the length direction, and the second protrusion 132 is used to abut against the wound electrode assembly 12. In other words, the second protrusion 132 is distributed at two edges of the insulating member 13 along the length direction.

[0122] Please refer to Figure 12 , Figure 12 which is a schematic diagram of the assembly process of the battery cell 10 when the tab ears are misaligned provided by some embodiments of the present application. For the convenience of reference, Figure 12 only a partial structure of the battery cell 10 is shown. In the battery cell 10 of the embodiments of the present application, when the wound electrode assembly 12 is wound, after the first tab ear 1211 of the first electrode sheet 121 and the second tab ear 1221 of the second electrode sheet 122 are misaligned, when the wound electrode assembly 12 is connected and assembled with the connecting member, the first connection regions P1 of the plurality of first tab ears 1211 and the first connecting member 141 can completely cover each first tab ear 1211, and the second connection regions P2 of the plurality of second tab ears 1221 and the second connecting member 142 can completely cover each second tab ear 1221.

[0123] According to some embodiments of the present application, the present application further provides a battery, which includes the battery cell 10 described in any of the above solutions.

[0124] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery described in any of the above solutions, and the battery is used to provide electrical energy for the electrical device.

[0125] The electrical device can be any of the above devices or systems that apply the battery.

[0126] According to some embodiments of the present application, refer to Figures 3 to 12, this application provides a battery cell 10, which includes a wound electrode assembly 12, a first connection member 141, and a second connection member 142. The wound electrode assembly 12 includes a first electrode tab 121, a second electrode tab 122, and a separator disposed between the first electrode tab 121 and the second electrode tab 122. The first electrode tab 121 includes a plurality of first tab ears 1211, and the plurality of first tab ears 1211 are stacked after the first electrode tab 121 is wound. The widths of the plurality of first tab ears 1211 gradually increase from the inner circle to the outer circle of the first electrode tab 121; the second electrode tab 122 includes a plurality of second tab ears 1221, and the plurality of second tab ears 1221 are stacked after the second electrode tab 122 is wound. The widths of the plurality of second tab ears 1221 gradually increase from the inner circle to the outer circle of the second electrode tab 122. After winding, regardless of whether the outer first tab ear 1211 is misaligned, there is a large overlapping area between the plurality of first tab ears 1211, so that the plurality of first tab ears 1211 and the first connection member 141 have a large connection area, ensuring the connection reliability between the plurality of first tab ears 1211 and the first connection member 141; similarly, regardless of whether the outer second tab ear 1221 is misaligned, there is a large overlapping area between the plurality of second tab ears 1221, so that the plurality of second tab ears 1221 and the second connection member 142 have a large connection area, ensuring the connection reliability between the plurality of second tab ears 1221 and the second connection member 142. The connection between the wound electrode assembly 12 and the connection member of the battery cell 10 is stable and reliable, not easily damaged, and has a high service life.

[0127] Figure 13 FIG. shows a schematic flow chart of a method for manufacturing the battery cell 10 according to some embodiments of the present application. As Figure 13 shown, the method for manufacturing the battery cell 10 may include:

[0128] 401, providing a housing 11;

[0129] 402, providing a wound electrode assembly 12, the wound electrode assembly 12 includes a first electrode tab 121, the first electrode tab 121 includes a plurality of first tab ears 1211, the plurality of first tab ears 1211 are stacked after the first electrode tab 121 is wound, the widths of the plurality of first tab ears 1211 gradually increase from the inner circle to the outer circle of the first electrode tab 121, the height of the first tab ear 1211 is H1, and the width of the root of the first tab ear 1211 is L1, satisfying 0.3 < H1 / L1 < 1;

[0130] 403, disposing the wound electrode assembly 12 in the housing 11.

[0131] It should be noted that the steps "401, providing the housing 11" and "402, providing the wound electrode assembly 12" are parallel steps, and the order of providing them is not limited. For example, the step "401, providing the housing 11" can be performed first, and then the step "402, providing the wound electrode assembly 12"; or, the step "402, providing the wound electrode assembly 12" can be performed first, and then the step "401, providing the housing 11".

[0132] Figure 14 FIG. shows a schematic block diagram of a manufacturing apparatus for a battery cell 10 according to some embodiments of the present application. As Figure 14 shown, the manufacturing apparatus for the battery cell 10 may include a providing module 501 and an assembling module 502. The providing module 501 is configured to provide the housing 11 and provide the wound electrode assembly 12. The wound electrode assembly 12 includes a first electrode tab 121. The first electrode tab 121 includes a plurality of first tab ears 1211. The plurality of first tab ears 1211 are stacked after the first electrode tab 121 is wound. The widths of the plurality of first tab ears 1211 gradually increase from the inner circle to the outer circle of the first electrode tab 121. The height of the first tab ear 1211 is H1, and the width of the root of the first tab ear 1211 is L1, satisfying 0.3 < H1 / L1 < 1. The assembling module 502 is configured to dispose the wound electrode assembly 12 within the housing 11.

[0133] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any manner. The present 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 wound electrode assembly for use in a prismatic battery cell, characterized in that, It includes a first pole piece and a second pole piece with a polarity opposite to that of the first pole piece. The first pole piece includes a plurality of first pole tabs, and the second pole piece includes a plurality of second pole tabs. After the first pole piece is wound, the plurality of first pole tabs are stacked along the thickness direction of the electrode assembly. The widths of the plurality of first pole tabs gradually increase from the inner circle to the outer circle of the first pole piece. The first pole tabs and the second pole tabs are arranged at intervals along a direction intersecting with the thickness direction of the electrode assembly. The height of the first pole tab is H1, and the width of the root of the first pole tab is L1, satisfying 0.3 < H1 / L1 < 1.

2. The wound electrode assembly according to claim 1, wherein Among the plurality of first pole tabs, the projection of the innermost first pole tab on a preset plane is located within the projection of the outermost first pole tab on the preset plane, and the preset plane is perpendicular to the stacking direction of the plurality of first pole tabs.

3. The wound electrode assembly according to claim 2, wherein, Among two adjacent first pole tabs, the projection of the inner first pole tab on the preset plane is located within the projection of the outer first pole tab on the preset plane.

4. The wound electrode assembly according to claim 1, wherein The width difference between every two adjacent first pole tabs is equal.

5. The wound electrode assembly according to claim 1, wherein, The first pole piece further includes a first main body portion. The first pole tab protrudes from the first edge of the first main body portion. The first pole tab includes two second edges oppositely arranged along its width direction, and the included angle between the second edge and the first edge is R, satisfying 90° < R < 120°.

6. The wound electrode assembly according to any one of claims 1-5, characterized in that, After the second pole piece is wound, the plurality of second pole tabs are stacked. The widths of the plurality of second pole tabs gradually increase from the inner circle to the outer circle of the second pole piece.

7. A battery cell, characterized in that, It includes: A housing; And A wound electrode assembly as described in any one of claims 1-6, and the wound electrode assembly is arranged inside the housing.

8. According to the battery cell described in claim 7, characterized in that The housing includes a housing body and an end cover. The housing body has an opening. The wound electrode assembly is arranged inside the housing body, and the end cover is used to cover the opening. The battery cell further includes: An insulating member, arranged between the end cover and the wound electrode assembly, for insulating and isolating the end cover from the first pole tab; Wherein, a first protrusion is arranged on the side of the insulating member facing the wound electrode assembly. The first protrusion abuts against the wound electrode assembly, and the first protrusion is provided with a first avoidance portion for avoiding the plurality of first pole tabs.

9. A battery, characterized in that, It includes a battery cell as described in any one of claims 7-8.

10. An electrical device, characterized in that, It includes a battery as described in claim 9, and the battery is used to provide electric energy.

11. A manufacturing device for a battery cell, characterized in that, It includes: A providing module is configured to provide a casing and a wound electrode assembly. The wound electrode assembly is used in a prismatic cell unit and includes a first electrode tab and a second electrode tab having a polarity opposite to that of the first electrode tab. The first electrode tab includes a plurality of first tab ears, and the second electrode tab includes a plurality of second tab ears. After the first electrode tab is wound, the plurality of first tab ears are stacked along the thickness direction of the electrode assembly. The widths of the plurality of first tab ears gradually increase from the inner circle to the outer circle of the first electrode tab. The first tab ears and the second tab ears are arranged at intervals along a direction intersecting with the thickness direction of the electrode assembly. The height of the first tab ear is H1, and the width of the root of the first tab ear is L1, satisfying 0.3 < H1 / L1 < 1; An assembling module is configured to dispose the wound electrode assembly in the casing.

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