Electrode assembly and manufacturing method and apparatus, battery cell, battery, electric device

Abstract

The embodiment of the application provides an electrode assembly, a manufacturing method and device, a battery monomer, a battery, and an electric device. The electrode assembly is used for a battery monomer (100) and comprises: first and second polar plates (1) and (2) with opposite polarities, the first and second polar plates (1) and (2) each comprising a main body part (11) and at least one tab group (12), the first and second polar plates (1) and (2) are wound around a winding axis (K) to superimpose the respective main body parts (11) to form a winding main body (S), and the main body part (11) has a plurality of polar plate layers (111) along the radial direction of the winding main body (S) after being wound; wherein the tab group (12) comprises a plurality of tabs (12') arranged in a stack, the plurality of tabs (12') protrude from the main body part (11), and in the radial direction, at least one polar plate layer (111) with the same polarity is arranged between at least two adjacent tabs (12') in the tab group (12).

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode assembly and its manufacturing method and apparatus, a battery cell, a battery, and an electrical device. Background Technology

[0002] Due to the advantages of lithium-ion batteries, such as high energy density, high power density, high cycle life, and long storage time, they have been widely used in electric vehicles.

[0003] However, improving the performance of batteries in electric vehicles has always been a challenge for the industry. Summary of the Invention

[0004] The purpose of this application is to improve battery performance.

[0005] According to a first aspect of this application, an electrode assembly is provided for a battery cell and includes:

[0006] The first and second pole pieces have opposite polarities. Both the first and second pole pieces include a main body and at least one set of pole tabs. The first and second pole pieces are wound around a winding axis so that their respective main bodies are superimposed to form a wound body. After the main body is wound, it has multiple pole piece layers along the radial direction of the wound body.

[0007] The electrode assembly includes multiple electrodes stacked together, with the electrodes protruding from the main body. In the radial direction, at least two adjacent electrodes in the electrode assembly are spaced apart by at least one electrode layer of the same polarity.

[0008] This embodiment reduces the number of tabs leading out from the same electrode sheet in the electrode assembly, simplifies the tab die-cutting process, and improves the misalignment of multiple tabs in the wound tab assembly, making it easier to control the misalignment within a small range, thereby increasing the effective connection between the tab assembly and the electrode terminals. Furthermore, this structure allows for sparser tab arrangement in the inner winding region, reducing the difficulty of tab die-cutting and improving the size and positional accuracy of the tabs. Additionally, this tab lead-out method reduces the weight of the electrode assembly, thereby reducing the weight of the individual battery cell. All of these advantages improve the performance of the individual battery cell.

[0009] In some embodiments, the interval between every two adjacent tabs in the tab group is provided along the winding direction.

[0010] In this embodiment, the tab arrangement allows the tab group to extend only along a portion of the circumferential direction of the winding structure after winding. This enables the tab groups of the first and second electrodes to be spaced apart along the circumferential direction of the winding structure. This not only spatially separates the different tab groups but also allows the electrolyte to penetrate into the winding body through the gap area, so that the electrolyte can fully react with the active materials on the first and second electrodes during the charging and discharging process of the battery.

[0011] In some embodiments, the number of electrode layers between every two adjacent electrodes in the electrode group gradually decreases from the inside to the outside.

[0012] This embodiment takes into account that the circumference of the electrode gradually decreases from the outer layer to the inner layer, the distance between two adjacent tabs near the inner layer is small, and the tabs are densely distributed. If tabs are led out from each electrode layer, the distance between adjacent tabs is small, the flow capacity of the radial inner region of the tab group has a margin, and it makes the die-cutting tab process more difficult, making it difficult to guarantee the accuracy of the die-cutting tabs, and it is also difficult to control the misalignment of multiple tabs in the tab group.

[0013] In some embodiments, the number of electrode layers between every two adjacent electrodes in the electrode group is equal.

[0014] This embodiment makes the multiple tabs in the tab group evenly distributed radially, making it easier to draw out the electrical energy provided by the multiple tabs in the tab group. For example, if the tab group is electrically connected to the electrode terminal through an adapter, it is easier to control the welding trajectory between the adapter and the tab group when welding, ensuring the electrical connection effect between the tab group and the adapter, and improving the reliability of the battery cell operation.

[0015] In some embodiments, the electrode group is provided such that the spacing between every two adjacent electrodes in the electrode group is consistent along the winding direction.

[0016] This embodiment, while satisfying the requirement of multiple electrode stacks in the electrode group, ensures that the spacing between adjacent electrodes in the electrode group remains consistent through design. This reduces the number of electrodes and lowers the difficulty of the die-cutting process. Only the same size cutter is needed for die-cutting, which can improve the production efficiency of the electrode assembly.

[0017] In some embodiments, the width of multiple tabs in the tab assembly gradually increases from the inside to the outside along the winding direction, so that the tab assembly has a fan-shaped structure.

[0018] This embodiment gradually increases the width of multiple tabs in the tab assembly from the inside to the outside in the radial direction. Based on the uniform distribution of the spacing between every two adjacent tabs, by increasing the width of the tabs in the outer layer area along the winding direction, the effective contact area when the tab assembly is connected to the electrode terminal can be increased, which can increase the current carrying capacity and thus improve the performance of the battery cell.

[0019] In some embodiments, the widths of the multiple tabs in the tab assembly are equal along the winding direction.

[0020] This embodiment makes the width of multiple electrodes in the electrode assembly equal, which reduces the difficulty of die-cutting electrodes, makes it easier to ensure the size of the electrodes, and makes it easier to ensure the alignment of multiple electrodes during winding, thereby reducing the process difficulty of manufacturing electrode components.

[0021] In some embodiments, the tabs of the first and second electrodes are respectively led out from the same end of the winding body along the winding axis.

[0022] This embodiment draws the tabs of the first and second electrodes from the same end of the winding body. It only requires reserving electrical connection space at one end of the electrode assembly, and eliminates the need to set electrode terminals at both ends of the battery cell. This can effectively improve the overall energy density of the battery cell. With a fixed capacity of the battery cell, it can reduce the volume of the battery cell, making it easier to arrange the battery in the power device.

[0023] In some embodiments, the tabs of the first and second electrodes are symmetrically arranged with respect to the winding axis.

[0024] This embodiment enables the first and second electrodes to have the same current-carrying capacity, and facilitates the increase of the circumferential dimensions of the tab assembly, thereby improving the current-carrying capacity of the battery cell and enhancing the spatial isolation effect of the tab assemblies of the first and second electrodes to prevent short circuits.

[0025] According to a second aspect of this application, a battery cell is provided, comprising:

[0026] The shell has an opening;

[0027] End cap assembly for closing an opening, the end cap assembly including an end cap body and a first electrode terminal, the end cap body for covering the opening, and the first electrode terminal disposed on the end cap body; and

[0028] In the above embodiment, the electrode assembly is disposed within the housing, at least one tab group of the first electrode is electrically connected to the first electrode terminal, and at least one tab group of the second electrode is electrically connected to the end cover body or the second electrode terminal disposed on the end cover body.

[0029] In some embodiments, the battery cell further includes two adapters, wherein at least one tab group of the first electrode is electrically connected to the first electrode terminal through one adapter, and at least one tab group of the second electrode is electrically connected to the end cap body or the second electrode terminal through the other adapter.

[0030] This embodiment takes into account that the multiple tabs in the tab assembly are in a fluffy state, making it difficult to connect them directly to the electrode terminals. By using an adapter to achieve the electrical connection between the tab assembly and the electrode terminals, the reliability of the connection between the tab assembly and the electrode terminals can be improved. This is beneficial for reliably transmitting the electrical energy output from the multiple tabs to the electrode terminals and reducing the process difficulty during connection.

[0031] In some embodiments, the end cap assembly further includes an insulating element comprising an insulating body and a first protrusion. The insulating body is disposed between the end cap body and the electrode assembly. The first protrusion is connected to the insulating body and protrudes toward the electrode assembly. An adapter and at least one tab connected thereto are located on one side of the first protrusion, and another adapter and at least one tab connected thereto are located on the other side of the first protrusion.

[0032] With the first and second electrode tabs extending from the same end of the winding body, this embodiment can physically isolate the tabs with opposite polarities through the first protrusion, preventing short circuits caused by vibration during assembly or use, ensuring the insulation performance between the first and second electrode tabs, and improving the reliability of the battery cell operation.

[0033] In some embodiments, the free ends of multiple electrodes in each electrode group are brought together and connected to the adapter.

[0034] In this embodiment, the connection method between the tab assembly and the adapter eliminates the tab flattening process. Multiple tabs are directly connected together and then connected to the adapter, which simplifies the assembly process of the battery cell and reduces the requirements for the positioning accuracy of the tab ends when connecting the tab assembly and the adapter, thereby improving the production efficiency of the battery cell.

[0035] In some embodiments, the free ends of multiple electrodes in each electrode group are flattened to form a connecting portion, and the connecting portion of each electrode is connected to the adapter.

[0036] This embodiment forms a connecting part by flattening the free ends of multiple tabs in the tab group, and connects it to the adapter through multiple connecting parts. This increases the radial length of the electrical connection between the adapter and the tab group. When welding is used for connection, it is easy to make the welding trajectory cover all the tabs in the tab group, improve welding reliability, and thus improve the performance of the battery cell.

[0037] According to a third aspect of this application, a battery is provided, comprising: a battery cell and a housing as described in the above embodiments, wherein the housing is used to house the battery cell.

[0038] According to a fourth aspect of this application, an electrical device is provided, including the battery of the above embodiment, the battery being used to provide electrical energy to the electrical device.

[0039] According to a fifth aspect of this application, a method for manufacturing an electrode assembly is provided, comprising:

[0040] Electrode supply step: Provide a first electrode and a second electrode with opposite polarities, each of the first electrode and the second electrode including a main body and at least one electrode tab group;

[0041] Electrode winding step: The first electrode and the second electrode are wound around the winding axis so that their respective main bodies are superimposed to form a winding body. After the main body is wound, it has multiple electrode layers along the radial direction of the winding body. The electrode tab group includes multiple electrode tabs stacked together. The multiple electrode tabs protrude from the main body. In the radial direction, at least two adjacent electrode tabs in the electrode tab group are spaced apart by at least one electrode layer of the same polarity.

[0042] According to a sixth aspect of this application, an apparatus for manufacturing an electrode assembly is provided, comprising:

[0043] An electrode providing device is configured to provide a first electrode and a second electrode of opposite polarity, each comprising a body portion and at least one tab assembly; and

[0044] An electrode winding apparatus is configured to wind a first electrode and a second electrode around a winding axis so that their respective main bodies are superimposed to form a winding body. After winding, the main body has multiple electrode layers along the radial direction of the winding body. An electrode tab assembly includes multiple electrode tabs stacked together, with the multiple electrode tabs protruding from the main body. In the radial direction, at least two adjacent electrode tabs in the electrode tab assembly are spaced apart by at least one electrode layer of the same polarity. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of some embodiments of the battery installation in a vehicle according to this application.

[0047] Figure 2 This is an exploded view of some embodiments of the battery in this application.

[0048] Figure 3 This is a schematic diagram of the structure of some embodiments of the battery cell of this application.

[0049] Figure 4 This is a cross-sectional view in longitudinal section of some embodiments of the battery cell of this application.

[0050] Figure 5 for Figure 4 A sectional view of the middle electrode assembly in the longitudinal section.

[0051] Figure 6 for Figure 5 The diagram shows the end structure of the electrode assembly.

[0052] Figure 7A and Figure 7BThe diagrams show the electrode assembly using a fan-shaped structure and an equal-width structure, respectively.

[0053] Figure 8 for Figure 4 A schematic diagram of the intermediate connector.

[0054] Figure 9 This is a cross-sectional view in longitudinal section of some other embodiments of the battery cell of this application.

[0055] Figure 10 for Figure 9 Schematic diagram of the end structure of the middle electrode assembly.

[0056] Figure 11 This is a schematic flowchart illustrating some embodiments of the electrode assembly manufacturing method of this application.

[0057] Figure 12 This is a schematic diagram of the module composition of some embodiments of the electrode assembly manufacturing apparatus of this application.

[0058] The accompanying drawings are not drawn to scale.

[0059] Marker explanation:

[0060] 10. Electrode assembly; 1. First electrode; 11. Main body; 111. Electrode layer; 12. Tab assembly; 12'. Tab; 121. Connecting part; 2. Second electrode; 3. Diaphragm;

[0061] 100. Battery cell; 101. Housing; 1011. Opening; 102. End cap assembly; 1021. End cap body; 1022. First electrode terminal; 1022'. Second electrode terminal; 1023. Insulator; 1023A. Insulator body; 1023B. First protrusion; 1023C. Second protrusion; 103. Adapter; 1031. First section; 1032. Second section; 1033. Third section; 1033'. Connecting hole; 1034. Extension section;

[0062] 200. Battery; 201. Housing; 201A. Receiving section; 201B. First cover; 201C. Second cover;

[0063] 300. Vehicle; 301. Axle; 302. Wheel; 303. Motor; 304. Controller;

[0064] 400. Manufacturing apparatus; 410. Electrode supply equipment; 420. Electrode winding equipment;

[0065] S, winding body; K, winding axis. Detailed Implementation

[0066] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating orientation or positional relationship are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0068] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" does not mean strictly vertical, but rather within the permissible range of error. "Parallel" does not mean strictly parallel, but rather within the permissible range of error. The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application.

[0069] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0070] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least some of the embodiments of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0071] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0072] This application uses terms such as "upper," "lower," "top," "bottom," "front," "back," "inner," and "outer" to indicate orientation or positional relationships. This is only for the convenience of describing this application and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this application.

[0073] Battery cells may include lithium-ion rechargeable batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0074] Current battery cells typically consist of a casing and an electrode assembly housed within the casing, with an electrolyte filled inside. The electrode assembly is mainly formed by stacking or winding a first electrode and a second electrode with opposite polarities, and a separator is usually provided between the first and second electrodes. The portions of the first and second electrodes coated with active material constitute the main body of the electrode assembly, while the portions of the first and second electrodes not coated with active material constitute the first tab and the second tab, respectively. In lithium-ion batteries, the first electrode can be a positive electrode, including a positive current collector and positive active material layers disposed on both sides of the positive current collector. The material of the positive current collector can be, for example, aluminum, and the positive active material can be, for example, lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The second electrode can be a negative electrode, including a negative current collector and negative active material layers disposed on both sides of the negative current collector. The material of the negative current collector can be, for example, copper, and the negative active material can be, for example, graphite or silicon, etc. The first tab and the second tab can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of a single battery cell, the positive and negative active materials react with the electrolyte, and the tabs connect the terminals to form a current loop.

[0075] Current battery cells typically have a first electrode terminal and a second electrode terminal with opposite polarities. The first electrode and the second electrode are die-cut tabs. After the first electrode and the second electrode are wound, each layer of the first electrode leads out a first tab. All the first tabs are stacked and electrically connected to the first electrode terminal. Each layer of the second electrode leads out a second tab. All the second tabs are stacked and electrically connected to the second electrode terminal.

[0076] However, the inventors discovered in practice that this type of electrode assembly has a large number of tabs on the same electrode sheet, which presents the following problems: First, it increases the difficulty of the tab die-cutting process. The multiple tabs stacked after winding are significantly misaligned, and the misalignment is difficult to control within a small range due to the influence of the tab die-cutting accuracy and winding tightness, thus reducing the effective connection between the stacked tabs and the electrode terminals. Second, the circumference of the electrode sheet gradually decreases from the outer layer to the inner layer, and the distance between adjacent tabs near the inner layer is small, resulting in a dense distribution of tabs, which makes die-cutting more difficult and makes it hard to guarantee the accuracy of the die-cutting. Third, it increases the weight of the electrode assembly, thereby increasing the weight of the battery cell. All of these problems affect the performance of the battery cell.

[0077] Based on the aforementioned problems, the inventors of this application, aiming to improve the performance of individual battery cells, sought to improve the lead-out method of the tabs in the electrode assembly by addressing the issues of tab misalignment and reducing tab die-cutting difficulty. The first and second electrode sheets each include a main body and at least one tab group. The first and second electrode sheets are wound around a winding axis, causing their respective main bodies to overlap and form a wound main body. After winding, the main body has multiple electrode layers along its radial direction. The tab group includes multiple stacked tabs, with at least one electrode layer of the same polarity spaced between at least two adjacent tabs in the tab group. This electrode assembly can improve tab misalignment, reduce tab die-cutting difficulty, and decrease the weight of the electrode assembly.

[0078] The battery cells in this application are applicable to batteries and electrical devices that use batteries.

[0079] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0080] like Figure 1As shown, the electrical device can be a vehicle 300, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle; or the electrical device can be a drone or a ship. Specifically, the vehicle 300 may include an axle 301, wheels 302 connected to the axle 301, a motor 303, a controller 304, and a battery 200. The motor 303 is used to drive the axle 301 to rotate, the controller 304 is used to control the operation of the motor 303, and the battery 200 can be located at the bottom, front, or rear of the vehicle 300 to provide power for the operation of the motor 303 and other components in the vehicle.

[0081] like Figure 2 As shown, battery 200 includes a housing 201 and battery cells 100. Battery 200 can contain one or more battery cells 100. If there are multiple battery cells 100, they can be connected in series, parallel, or a combination thereof. A combination connection means that multiple battery cells 100 can be connected in both series and parallel configurations. This can be achieved by first connecting multiple battery cells 100 in series, parallel, or a combination thereof to form a battery module, and then connecting multiple battery modules in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 201. Alternatively, all battery cells 100 can be directly connected in series, parallel, or a combination thereof, and then the whole formed by all battery cells 100 is housed within the housing 201.

[0082] The housing 201 is hollow inside, used to accommodate one or more battery cells 100. Depending on the shape, number, arrangement, and other requirements of the battery cells 100 accommodated, the housing 201 may also have different shapes and sizes. For example, the housing 201 may include: a receiving portion 201A, a first cover 201B, and a second cover 201C. The receiving portion 201A has openings at both opposite ends, and the first cover 201B and the second cover 201C are respectively used to close the openings at both ends of the receiving portion 201A. Figure 2 According to the arrangement of multiple battery cells 100, the receiving part 201A has a rectangular cylindrical structure.

[0083] like Figure 3 and Figure 4 As shown, the battery cell 100 includes a housing 101, an end cap assembly 102, and an electrode assembly 10. The battery cell 100 can be, for example, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, or a magnesium-ion battery.

[0084] The housing 101 is a hollow structure for accommodating the electrode assembly 10, and the housing 101 has an opening 1011; the end cap assembly 102 is used to close the opening 1011, and the end cap assembly 102 includes an end cap body 1021, a first electrode terminal 1022 and a second electrode terminal 1022', the first electrode terminal 1022 and the second electrode terminal 1022' are disposed on the end cap body 1021, and the end cap body 1021 is used to cover the opening 1011.

[0085] Electrode assembly 10 is disposed within housing 101. Electrode assembly 10 includes a first electrode 1 and a second electrode 2 with opposite polarities. The first electrode 1 and the second electrode 2 are formed by winding around a winding axis K. Both the first electrode 1 and the second electrode 2 of electrode assembly 10 include at least one tab group 12. The tab group 12 of the first electrode 1 may include multiple first tabs as mentioned above, and the tab group 12 of the second electrode 2 may include multiple second tabs as mentioned above. At least one tab group 12 of the first electrode 1 is electrically connected to a first electrode terminal 1022, and at least one tab group 12 of the second electrode 2 is electrically connected to a second electrode terminal 1022'.

[0086] like Figure 4 As shown, the tabs 12 of the first electrode 1 and the second electrode 2 can be located at the same end of the electrode assembly 10 along the winding axis K. Correspondingly, an end cap assembly 102 is provided at one end of the housing 101, and the first electrode terminal 1022 and the second electrode terminal 1022' are both provided on the same end cap body 1021. This can reduce the size of the battery cell 100 in the winding axis K direction and improve the overall energy density of the battery cell 100. Optionally, the tabs 12 of the first electrode 1 and the second electrode 2 are respectively located at both ends of the electrode assembly 10 along the winding axis K. Correspondingly, end cap assemblies 102 are respectively provided at both ends of the housing 101, and the first electrode terminal 1022 and the second electrode terminal 1022' are respectively provided on the end cap bodies 1021 at both ends.

[0087] Optionally, at least one tab group 12 of the first electrode 1 is electrically connected to the first electrode terminal 1022, and at least one tab group 12 of the second electrode 2 is electrically connected to the end cap body 1021. To facilitate connection, at least one tab group 12 of the second electrode 2 is electrically connected to the end cap body 1021 located at the same end.

[0088] In some embodiments, such as Figure 4 As shown, the battery cell 100 also includes two adapters 103. At least one tab group 12 of the first electrode 1 is electrically connected to the first electrode terminal 1022 through one adapter 103, and at least one tab group 12 of the second electrode 2 is electrically connected to the end cover body 1021 or the second electrode terminal 1022' through the other adapter 103.

[0089] This embodiment takes into account that the multiple tabs 12' in the tab group 12 are in a fluffy state, making it difficult to connect them directly to the electrode terminals. By using the adapter 103 to achieve the electrical connection between the tab group 12 and the electrode terminals, the reliability of the connection between the tab group 12 and the electrode terminals can be improved. This is beneficial for reliably transmitting the electrical energy output from the multiple tabs 12' to the electrode terminals and reducing the process difficulty during connection.

[0090] In some embodiments, the end cap assembly 102 further includes an insulating member 1023, which may be made of a material such as plastic. The insulating member 1023 includes an insulating body 1023A and a first protrusion 1023B. The insulating body 1023A is disposed between the end cap body 1021 and the electrode assembly 10 along the winding axis K. The first protrusion 1023B is connected to the insulating body 1023A and protrudes toward the electrode assembly 10. One adapter 103 and at least one tab assembly 12 connected thereto are located on one side of the first protrusion 1023B, and another adapter 103 and at least one tab assembly 12 connected thereto are located on the other side of the first protrusion 1023B.

[0091] For the cylindrical battery cell 100, the insulating body 1023A can be a disc structure. Grooves or protrusions can be provided on the disc structure as needed. Since the tabs 12 of the first electrode 1 and the second electrode 2 are spaced apart circumferentially along the winding body S, the first protrusion 1023B can be located within the spaced area and extend along the diameter of the insulating body 1023A. The first protrusion 1023B can be rectangular, trapezoidal, triangular, etc., within the longitudinal section of the battery cell 100. The insulating member 1023 may also include a second protrusion 1023C, which is connected to the insulating body 1023A and protrudes towards the electrode assembly 10. The second protrusion 1023C is located radially near the outer end of the insulating body 1023A and is used to prevent a short circuit between the housing 101 and the tab assembly 12. The second protrusion 1023C may extend only partially circumferentially at the location where the tab assembly 12 is located, or it may extend along the entire circumferential direction.

[0092] With the structure in which the tabs 12 of the first electrode 1 and the second electrode 2 are led out from the same end of the winding body S, this embodiment can physically isolate the tabs 12 with opposite polarities through the first protrusion 1023B, prevent short circuits caused by vibration during assembly or use, ensure the insulation performance between the tabs 12 of the first electrode 1 and the second electrode, and improve the reliability of the battery cell 100.

[0093] The structure of electrode assembly 10 is described in detail below.

[0094] In some embodiments, such as Figure 4As shown, the electrode assembly 10 includes a first electrode 1 and a second electrode 2 with opposite polarities. Both the first electrode 1 and the second electrode 2 include a main body portion 11 and at least one tab group 12. The first electrode 1 and the second electrode 2 are wound around a winding axis K such that their respective main bodies 11 are superimposed to form a wound body S. After winding, the main body portion 11 has multiple electrode layers 111 along the radial direction of the wound body S. The tab group 12 includes multiple tabs 12' stacked together, with the tabs 12' protruding from the main body portion 11. Radially, at least two adjacent tabs 12' in the tab group 12 are spaced apart by at least one tab layer 111 of the same polarity.

[0095] The first electrode 1 and the second electrode 2 have essentially the same shape and can be elongated strip structures. The first electrode 1 and the second electrode 2 are stacked along a direction perpendicular to the winding axis K, and the resulting winding body S can be a cylinder, a flat body, a cuboid, or other shapes. For example, the first electrode 1 is a positive electrode and the second electrode 2 is a negative electrode; or the first electrode 1 is a negative electrode and the second electrode 2 is a positive electrode. The electrode assembly 10 also includes a diaphragm 3, which is used to isolate the first electrode 1 and the second electrode 2. The diaphragm 3, the main body 11 of the first electrode 1, and the main body of the second electrode 2 are wound together to form the winding body S.

[0096] The main body 11 of the first electrode 1 has multiple electrode layers 111 along the radial direction of the winding body S after winding. The main body 11 of the second electrode 2 also has multiple electrode layers 111 along the radial direction of the winding body S after winding. The electrode layers 111 of the first electrode 1 and the second electrode 2 are arranged alternately in the radial direction, and all the electrode layers 111 of the first electrode 1 and all the electrode layers of the second electrode 2 together form the winding body S.

[0097] Each of the first electrode 1 and the second electrode 2 may be provided with a tab group 12. The tab groups 12 of the first electrode 1 and the second electrode 2 are spaced apart in the circumferential direction of the winding body S to avoid short circuits. Moreover, since the spaced areas are not provided with tabs, they can serve as electrolyte conducting areas, allowing the electrolyte to penetrate from the electrolyte conducting areas into the interior of the winding body S, so that the electrolyte can fully react with the active materials on the first electrode 1 and the second electrode 2 during the charging and discharging process of the battery. Optionally, at least one of the first electrode 1 and the second electrode 2 may also be provided with multiple tab groups 12.

[0098] The tab assembly 12 includes a plurality of tabs 12' stacked together, with the tabs 12' protruding from the main body 11 along the winding axis K. Stacking together means that the tabs 12' in the same tab assembly 12 are distributed along the same radial direction of the winding structure S, i.e., the radial projections of the tabs 12' have overlapping areas. Any side alignment or deviation of the tabs 12' along the winding direction is within the scope of protection of this application.

[0099] For at least one of the first electrode 1 and the second electrode 2, radially, at least two adjacent electrodes 12' in the electrode group 12 are spaced apart by at least one electrode layer 111 of the same polarity. For example, only one set of electrodes 12's two adjacent electrodes 12's are spaced apart by at least one electrode layer 111 of the same polarity, or multiple sets of electrodes 12's two adjacent electrodes 12's are spaced apart by at least one electrode layer 111 of the same polarity. In other words, at least one of the first electrode 1 and the second electrode 2 leads out electrodes 12' only in a portion of the electrode layers 111 to form the electrode group 12, and not in every electrode layer 111. In addition, the number of electrode layers 111 of the same polarity between two adjacent electrodes 12' is greater than one layer, for example, greater than five layers.

[0100] This embodiment reduces the number of tabs 12' leading out from the same electrode sheet in the electrode assembly 10, lowers the difficulty of the tab die-cutting process, and improves the misalignment of multiple tabs 12' in the wound tab group 12, making it easier to control the misalignment within a small range, thereby increasing the effective connection between the tab group 12 and the electrode terminal. Furthermore, this structure allows for the arrangement of sparser tabs 12' in the inner winding area, reducing the difficulty of die-cutting the tabs and improving the dimensional and positional accuracy of the tabs 12'. Additionally, this tab lead-out method reduces the weight of the electrode assembly 10, thereby reducing the weight of the battery cell 100. All of these advantages improve the performance of the battery cell 100.

[0101] In some embodiments, such as Figure 4 As shown, the tabs 12 of the first electrode 1 and the second electrode 2 are led out from the same end of the winding body S along the winding axis K.

[0102] In this embodiment, the tabs 12 of the first electrode 1 and the second electrode 2 are led out from the same end of the winding body S. Only one end of the electrode assembly 10 needs to be reserved for electrical connection, which also eliminates the need to set electrode terminals at both ends of the battery cell 100. This can effectively improve the overall energy density of the battery cell 100. With a certain capacity of the battery cell 100, the volume of the battery cell 100 can be reduced, making it easier to arrange the battery 200 in the power device.

[0103] For example, the tab assembly 12 of the first electrode 1 is electrically connected to the first electrode terminal 1022 via an adapter 103, and the tab assembly 12 of the second electrode 2 is electrically connected to the second electrode terminal 1022' via another adapter 103. Figure 8As shown, the adapter 103 is formed by bending a sheet-like structure and is composed of three stacked segments, which also occupy a certain space along the winding axis K. Therefore, the tab groups 12 of the first electrode 1 and the second electrode 2 are led out from the same end of the winding body S, which can save the height occupied by an electrode terminal, an adapter 103 and a tab group 12 in the direction of the winding axis K, and can greatly improve the overall energy density of the battery cell 100.

[0104] Optionally, the tabs 12 of the first electrode 1 and the second electrode 2 can also be led out from both ends of the winding body S along the winding axis K.

[0105] In some embodiments, the tabs 12 are spaced apart between every two adjacent tabs 12' in the winding direction. Since the tabs 12 of the first electrode 1 and the second electrode 2 are spaced apart along the circumferential direction of the winding structure S, the tabs 12 extend partially along the circumferential direction of the winding structure S. Therefore, the tabs 12 are discretely arranged in the main body 11 between every two adjacent tabs 12' in the winding direction.

[0106] In this embodiment, the tabs 12' are arranged such that after winding, the tab group 12 only extends circumferentially along a portion of the winding structure S. This allows the tab groups 12 of the first electrode 1 and the second electrode 2 to be spaced apart circumferentially along the winding structure S. This not only spatially separates the different tab groups 12, but also allows the electrolyte to penetrate into the winding body S through the gap area, so that during the charging and discharging process of the battery, the electrolyte can fully react with the active materials on the first electrode 1 and the second electrode 2.

[0107] In some embodiments, such as Figure 5 and Figure 6 As shown, the number of electrode layers 111 between every two adjacent electrodes 12' in the electrode group 12 gradually decreases from the inside to the outside.

[0108] Figure 6 The solid arc lines in the diagram represent the led-out tabs 12', and the dashed arc lines represent the electrode layers 111 without led-out tabs 12'. "From the inside out" relative to the radial direction of the winding body S, "gradually decreasing" includes decreasing according to an arithmetic progression; for example, the number of electrode layers 111 of the same polarity between every two adjacent tabs 12' from the inside out is: 4 layers, 3 layers, 2 layers, and 1 layer, respectively. Not all electrode layers 111 in the innermost region are shown. Alternatively, "gradually decreasing" may also include decreasing according to any other pattern.

[0109] This embodiment takes into account that the circumference of the electrode gradually decreases from the outer layer to the inner layer, the distance between two adjacent tabs near the inner layer is small, and the tabs are densely distributed. If each electrode layer 111 leads out a tab 12', the distance between adjacent tabs 12' is small, the flow capacity of the radial inner region of the tab group 12 has a margin, and it makes the die-cutting tab process more difficult, making it difficult to guarantee the accuracy of the die-cutting tabs, and it is also difficult to control the misalignment of multiple tabs 12' in the tab group 12.

[0110] This method of leading out the tabs 12' allows the multiple tabs 12' in the tab group 12 to gradually increase in density radially from the inside to the outside. While reducing the number of tabs 12', it balances the spacing between adjacent tabs 12' in the inner and outer rings based on the distribution characteristics of the tabs 12' from the inner to the outer layer, making the inner layer tabs 12' more sparsely distributed. This effectively reduces the difficulty of die-cutting the tabs while ensuring current carrying capacity and improves the precision of die-cutting. After winding, it is easier to control the misalignment of multiple tabs 12' in the tab group 12 within a small range. Furthermore, it can effectively reduce the weight of the electrode assembly 10.

[0111] In some embodiments, the tab group 12 is provided such that the spacing between every two adjacent tabs 12' in the tab group 12 is consistent along the winding direction.

[0112] The term "consistency" here includes the equal spacing between any two adjacent tabs 12' along the winding direction, and also includes situations where the spacing is adjusted within a preset range to ensure the alignment of the multiple tabs 12' stacked together. Accordingly, when the first electrode 1 and the second electrode 2 are in the unfolded state, the spacing between any two adjacent tabs 12' in the tab group 12 along the length direction of the electrode is consistent.

[0113] This embodiment, while satisfying the requirement of multiple tabs 12' being stacked in the tab group 12, designs to ensure that the spacing between adjacent tabs 12' in the tab group 12 remains consistent. This reduces the number of tabs 12' while lowering the difficulty of the die-cutting process. Only the same size cutter is needed for die-cutting, which can improve the production efficiency of the electrode assembly 10.

[0114] In some embodiments, such as Figure 7A As shown, the width of multiple tabs 12' in the tab group 12 gradually increases from the inside to the outside along the winding direction, making the tab group 12 have a fan-shaped structure.

[0115] This embodiment makes the width of the multiple tabs 12' in the tab group 12 gradually increase radially from the inside to the outside. Based on the uniform distribution of the spacing between every two adjacent tabs 12', by increasing the width of the outer layer tabs 12' along the winding direction, the effective contact area when the tab group 12 is connected to the electrode terminal can be increased, which can increase the overcurrent capacity and thus improve the performance of the battery cell 100.

[0116] In some embodiments, such as Figure 7B As shown, the widths of the multiple tabs 12' in the tab group 12 are equal along the winding direction.

[0117] The tab assembly 12 has a rectangular structure, except that the two radially opposite sides of the rectangular structure are rounded. The identical ends of multiple tabs 12' in the tab assembly 12 are aligned to increase the effective contact area when the tab assembly 12 is electrically connected to the electrode terminals, thereby improving the current carrying capacity. Optionally, positional deviations of the identical ends of multiple tabs 12' in the tab assembly 12 along the winding direction are also within the protection scope of this solution.

[0118] This embodiment makes the width of the multiple tabs 12' in the tab group 12 equal, which can reduce the difficulty of die-cutting the tabs, make it easier to ensure the size of the tabs 12', and make it easier to ensure the alignment of the multiple tabs 12' during winding, thereby reducing the process difficulty of preparing the electrode assembly 10.

[0119] In some embodiments, such as Figure 7A and Figure 7B The tab groups 12 of the first electrode 1 and the second electrode 2 are symmetrically arranged with respect to the winding axis K. The "symmetrical arrangement" means that the tab groups 12 of the first electrode 1 and the second electrode 2 have the same shape and are symmetrically positioned with respect to the center of the winding axis K.

[0120] This embodiment enables the first electrode 1 and the second electrode 2 to have the same current-carrying capacity, and facilitates increasing the circumferential dimensions of the tab assembly 12, thereby improving the current-carrying capacity of the battery cell 100 and enhancing the spatial isolation effect of the tab assemblies 12 of the first electrode 1 and the second electrode 2 to prevent short circuits. Furthermore, for Figure 4 In the structure shown, the tab group 12 of the first electrode 1 is electrically connected to the first electrode terminal 1022 via an adapter 103, and the tab group 12 of the second electrode 2 is electrically connected to the second electrode terminal 1022' via another adapter 103. The tab groups 12 of the first electrode 1 and the second electrode 2 are symmetrically arranged with two adapters 103 to provide arrangement space, which can prevent the two adapters 103 from short-circuiting due to being too close in the circumferential direction. The two adapters also make the first electrode terminal 1022 and the second electrode terminal 1022' symmetrically arranged with respect to the winding axis K.

[0121] In some embodiments, the free ends of a plurality of tabs 12' in each tab group 12 are brought together and connected to the adapter 103.

[0122] After the free ends of multiple tabs 12' are brought together, they can be connected together, for example, by welding. Then, the length of the multiple tabs 12' connected together is connected to the adapter 103. Finally, the adapter 103 is bent to facilitate the connection of the electrode terminals. Since the distances between the multiple tabs 12' and the brought-to-be-closed position are different, the multiple tabs 12' can be set to different lengths to facilitate the connection of the multiple tabs 12'. For the electrode assembly 10 in the tab group 12 where the number of electrode layers 111 between every two adjacent tabs 12' gradually decreases from the inside to the outside, since the multiple tabs 12' are not uniformly distributed in the radial direction, this method connects the multiple tabs 12' together with a simpler process, which can reduce the requirements for the positioning accuracy of the tab 12' ends during connection.

[0123] The adapter 103 has a sheet-like structure and is bent after being connected to the tab assembly 12, with more than two bends. Figure 8 As shown, along the winding axis K, it includes a first segment 1031, a second segment 1032, and a third segment 1033 arranged in parallel. The first end of the second segment 1032 is connected to the first segment 1031, and the second end of the second segment 1032 is connected to the third segment 1033. The third segment 1033 is provided with a connecting hole 1033' for connecting to the first electrode terminal 1022 or the second electrode terminal 1022'. An extension segment 1034 can be connected to the side of the first segment 1031 for electrical connection to the tab assembly 12. The length of the multiple tabs 12' connected together is electrically connected to the extension segment 1034 and bent to the side of the extension segment 1034 away from the electrode assembly 10, to prevent the risk of the tabs 12' inserting into the winding body S when the battery cell 100 is subjected to vibration, thereby improving the safety of the battery cell 100.

[0124] In this embodiment, the connection method between the tab assembly 12 and the adapter 103 can eliminate the tab flattening process, directly connecting multiple tabs 12' together and then connecting them to the adapter 103. This simplifies the assembly process of the battery cell 100 and reduces the requirements for the positioning accuracy of the tab 12' ends when connecting the tab assembly 12 and the adapter 103, thereby improving the production efficiency of the battery cell 100.

[0125] In some embodiments, such as Figure 9 As shown, the number of electrode layers 111 between every two adjacent electrodes 12' in the electrode group 12 is equal.

[0126] Figure 10 The solid arc-shaped lines in the diagram represent the tabs 12' that are brought out, and the dashed arc-shaped lines represent the electrode layers 111 that are not brought out. For example, the number of electrode layers 111 between every two adjacent tabs 12' can be 1, 2, 3 or more.

[0127] This embodiment makes the multiple tabs 12' in the tab group 12 evenly distributed radially, making it easier to draw out the electrical energy provided by the multiple tabs 12' in the tab group 12. For example, if the tab group 12 is electrically connected to the electrode terminal through the adapter 103, it is easier to control the welding trajectory of the adapter 103 and the tab group 12 when welding is used, ensuring the electrical connection effect between the tab group 12 and the adapter 103, and improving the reliability of the battery cell 100.

[0128] In some embodiments, the free ends of the plurality of tabs 12' in each tab group 12 are flattened to form a connecting portion 121, and the connecting portion 121 of each of the plurality of tabs 12' is connected to the adapter 103.

[0129] The flattening process involves applying external force to the tab 12' along the circumference of the winding body S using a tool, causing the tab 12' to bend and deform, so that the two adjacent tabs 12' along the radial direction are more compact, thereby facilitating the connection of the tab assembly 12 to the adapter 103 or the electrode terminal.

[0130] For electrode assembly 10 in electrode group 12, the number of electrode layers 111 between each two adjacent electrodes 12' is equal. Multiple electrodes 12' in electrode group 12 are evenly distributed radially. Through the flattening process, multiple electrodes 12' can form a connecting part 121 of the same length as a welding plane, and are connected to the adapter 103 through the connecting part 121 of each of the multiple electrodes 12'.

[0131] In this embodiment, the free ends of multiple tabs 12' in the tab group 12 are flattened to form a connecting part 121, and the multiple connecting parts 121 are connected to the adapter 103. This increases the radial length of the electrical connection between the adapter 103 and the tab group 12. When welding is used for connection, it is easy to make the welding trajectory cover all the tabs 12' in the tab group 12, improve the welding reliability, and thus improve the performance of the battery cell 100.

[0132] Two specific embodiments of the battery cell 100 will be given below.

[0133] In some embodiments, such as Figures 4 to 8 As shown, the battery cell 100 includes a housing 101, an end cap assembly 102, and an electrode assembly 10. The housing 101 has an opening 1011, and the end cap assembly 102 is used to close the opening 1011. The end cap assembly 102 includes an end cap body 1021, a first electrode terminal 1022, and a second electrode terminal 1022'. The first electrode terminal 1022 and the second electrode terminal 1022' are disposed on the end cap body 1021, and the end cap body 1021 is used to cover the opening 1011. For example, the battery cell 100 may be cylindrical.

[0134] Electrode assembly 10 is disposed within housing 101. Electrode assembly 10 includes a first electrode 1 and a second electrode 2 with opposite polarities. The first electrode 1 and the second electrode 2 are formed by winding around a winding axis K. Both the first electrode 1 and the second electrode 2 of electrode assembly 10 include a main body 11 and an electrode tab group 12. For example, to reduce the number of electrodes, one electrode tab group 12 can be provided. The electrode tab group 12 of the first electrode 1 is electrically connected to the first electrode terminal 1022 through an adapter 103, and the electrode tab group 12 of the second electrode 2 is electrically connected to the second electrode terminal 1022' through another adapter 103. The electrode tab groups 12 of the first electrode 1 and the second electrode 2 can be located at the same end of electrode assembly 10 along the winding axis K. Correspondingly, an end cap assembly 102 is provided at one end of housing 101, and the first electrode terminal 1022 and the second electrode terminal 1022' are both provided on the same end cap body 1021.

[0135] The first electrode 1 and the second electrode 2 are wound around the winding axis K so that their respective main body portions 11 are superimposed to form a wound body S, and the main body portion 11 has a plurality of electrode layers 111 along the radial direction of the wound body S after winding. The electrode tab group 12 includes a plurality of electrode tabs 12' stacked in a stacked manner. In the radial direction, at least two adjacent electrode tabs 12' in the electrode tab group 12 are spaced apart by at least one electrode layer 111 of the same polarity, and the number of electrode layers 111 spaced between every two adjacent electrode tabs 12' in the electrode tab group 12 gradually decreases from the inside to the outside.

[0136] For this type of tab 12' lead-out method, the free ends of multiple tabs 12' in each tab group 12 are brought together, and the length segment connecting the multiple tabs 12' is connected to the adapter 103. The adapter 103 is then bent to connect to the electrode terminal. The bringing-to-gather position can be located in the radial middle region to accommodate the connection of both inner and outer tabs 12'. The structure of the adapter 103 after bending is as follows... Figure 8 As shown, its specific structure has been described above.

[0137] In other embodiments, such as Figure 9 As shown, with Figures 4 to 8 The difference in the illustrated embodiment is that the number of electrode layers 111 between every two adjacent electrodes 12' in the electrode group 12 is equal, for example, the number of electrode layers 111 is 2 or other layers. The free ends of the plurality of electrodes 12' in each electrode group 12 are formed into connecting portions 121 by flattening, and the plurality of connecting portions 121 form a welding plane. The connecting portions 121 of each plurality of electrodes 12' are connected to the adapter 103, for example, by welding.

[0138] Secondly, this application provides a method for manufacturing an electrode assembly 10. In some embodiments, such as... Figure 11 As shown, the manufacturing method includes:

[0139] S110, Electrode Provision Step: Provide a first electrode 1 and a second electrode 2 with opposite polarities, each of the first electrode 1 and the second electrode 2 including a main body portion 11 and at least one electrode tab group 12;

[0140] S120, Electrode winding step: The first electrode 1 and the second electrode 2 are wound around the winding axis K so that their respective main body portions 11 are superimposed to form a winding body S. After the main body portion 11 is wound, it has a plurality of electrode layers 111 along the radial direction of the winding body S. The electrode tab group 12 includes a plurality of electrode tabs 12' stacked together. The plurality of electrode tabs 12' protrude from the main body portion 11. In the radial direction, at least two adjacent electrode tabs 12' in the electrode tab group 12 are spaced apart by at least one electrode layer 111 of the same polarity.

[0141] S110 and S120 are executed sequentially.

[0142] This embodiment reduces the number of tabs 12' leading out from the same electrode sheet in the electrode assembly 10, lowers the difficulty of the tab die-cutting process, and improves the misalignment of multiple tabs 12' in the wound tab group 12, making it easier to control the misalignment within a small range, thereby increasing the effective connection between the tab group 12 and the electrode terminal. Furthermore, this structure allows for the arrangement of sparser tabs 12' in the inner winding area, reducing the difficulty of die-cutting the tabs and improving the dimensional and positional accuracy of the tabs 12'. Additionally, this tab lead-out method reduces the weight of the electrode assembly 10, thereby reducing the weight of the battery cell 100. All of these advantages improve the performance of the battery cell 100.

[0143] Finally, this application provides a manufacturing apparatus 400 for an electrode assembly 10, in some embodiments, such as Figure 12 As shown, the manufacturing apparatus 400 includes an electrode feeding device 410 and an electrode winding device 420.

[0144] The electrode supply device 410 is configured to provide a first electrode 1 and a second electrode 2 of opposite polarities, each of the first electrode 1 and the second electrode 2 including a body portion 11 and at least one tab assembly 12; and

[0145] The electrode winding apparatus 420 is configured to wind the first electrode 1 and the second electrode 2 around the winding axis K so that their respective main bodies 11 are superimposed to form a winding body S. After the main body 11 is wound, it has a plurality of electrode layers 111 along the radial direction of the winding body S. The electrode tab assembly 12 includes a plurality of electrode tabs 12' stacked together. The plurality of electrode tabs 12' protrude from the main body 11. In the radial direction, at least two adjacent electrode tabs 12' in the electrode tab assembly 12 are spaced apart by at least one electrode layer 111 of the same polarity.

[0146] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing (101) has an opening (1011). The electrode assembly (10) includes a first electrode (1) and a second electrode (2) of opposite polarity. Both the first electrode (1) and the second electrode (2) include a main body (11) and at least one tab assembly (12). The first electrode (1) and the second electrode (2) are wound around a winding axis (K) such that their respective main bodies (11) are superimposed to form a wound body (S). After being wound, the main body (11) has multiple electrode layers (111) along the radial direction of the wound body (S). The tab groups (12) of the first electrode (1) and the second electrode (2) are respectively led out from the same end of the winding body (S) along the winding axis (K), wherein the tab group (12) includes a plurality of tabs (12') stacked together, the plurality of tabs (12') protruding from the body portion (11), and in the radial direction, at least two adjacent tabs (12') in the tab group (12) are spaced apart by at least one electrode layer (111) of the same polarity. An end cap assembly (102) is used to close the opening (1011). The end cap assembly (102) includes an end cap body (1021), a first electrode terminal (1022), and an insulating member (1023). The end cap body (1021) is used to cover the opening (1011). The first electrode terminal (1022) is disposed on the end cap body (1021). The insulating member (1023) includes an insulating body (1023A) and a first protrusion (1023B). The insulating body (1023A) is disposed between the end cap body (1021) and the electrode assembly (10). The first protrusion (1023B) is connected to the insulating body (1023A) and protrudes toward the electrode assembly (10). Two adapters (103), the adapters (103) are sheet-like structures, and the adapters (103) have a bending structure with more than two folds; The at least one tab group (12) of the first electrode (1) is electrically connected to the first electrode terminal (1022) via an adapter (103), and the at least one tab group (12) of the second electrode (2) is electrically connected to the end cap body (1021) or the second electrode terminal (1022') provided on the end cap body (1021) via another adapter (103). One adapter (103) and the at least one tab group (12) connected thereto are located on one side of the first protrusion (1023B), and the other adapter (103) and the at least one tab group (12) connected thereto are located on the other side of the first protrusion (1023B). The first protrusion (1023B) physically isolates the tab groups (12) with opposite polarities.

2. The battery cell according to claim 1, characterized in that, In the electrode group (12), every two adjacent electrodes (12') are spaced apart along the winding direction.

3. The battery cell according to claim 2, characterized in that, The number of electrode layers (111) between every two adjacent electrodes (12') in the electrode group (12) gradually decreases from the inside to the outside.

4. The battery cell according to claim 2, characterized in that, The number of electrode layers (111) between any two adjacent electrodes (12') in the electrode group (12) is equal.

5. The battery cell according to claim 1, characterized in that, The electrode group (12) is provided, and the spacing between any two adjacent electrodes (12') in the electrode group (12) along the winding direction is consistent.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The width of the plurality of electrodes (12') in the electrode group (12) gradually increases from the inside to the outside along the winding direction, so that the electrode group (12) has a fan-shaped structure.

7. The battery cell according to any one of claims 1 to 5, characterized in that, The widths of the plurality of tabs (12') in the tab group (12) are equal along the winding direction.

8. The battery cell according to claim 1, characterized in that, The tabs (12) of the first electrode (1) and the second electrode (2) are symmetrically arranged with respect to the winding axis (K).

9. The battery cell according to claim 1, characterized in that, The free ends of the plurality of electrodes (12') in each electrode group (12) are brought together and connected to the adapter (103).

10. The battery cell according to claim 1, characterized in that, The free ends of the plurality of electrodes (12') in each electrode group (12) are formed into connecting portions (121) by flattening, and the connecting portions (121) of each plurality of electrodes (12') are connected to the adapter (103).

11. A battery, characterized in that, include: The battery cell (100) as described in any one of claims 1 to 10. as well as The housing (201) is used to house the battery cell (100).

12. An electrical device comprising a battery (200) as claimed in claim 11, the battery (200) being used to provide electrical energy to the electrical device.

13. A method for manufacturing an electrode assembly, said electrode assembly being used in a battery cell as described in any one of claims 1-10, characterized in that, The manufacturing method includes: Electrode supply step: Provide a first electrode (1) and a second electrode (2) with opposite polarities, wherein the first electrode (1) and the second electrode (2) each include a main body (11) and at least one electrode tab group (12). Electrode winding step: The first electrode (1) and the second electrode (2) are wound around the winding axis (K) to form a winding body (S) of their respective main body (11), and the main body (11) has a plurality of electrode layers (111) along the radial direction of the winding body (S) after winding. The electrode tab group (12) includes a plurality of electrode tabs (12') stacked together. The plurality of electrode tabs (12') protrude from the main body (11). In the radial direction, at least two adjacent electrode tabs (12') in the electrode tab group (12) are spaced apart by at least one electrode layer (111) of the same polarity.

14. An apparatus for manufacturing an electrode assembly, said electrode assembly being used in a battery cell as described in any one of claims 1-10, characterized in that, The manufacturing apparatus includes: An electrode providing device (410) is configured to provide a first electrode (1) and a second electrode (2) of opposite polarity, each of the first electrode (1) and the second electrode (2) including a body portion (11) and at least one tab assembly (12); and An electrode winding apparatus (420) is configured to wind the first electrode (1) and the second electrode (2) around a winding axis (K) to form a winding body (S) with their respective main body portions (11), and the main body portions (11) having a plurality of electrode layers (111) radially along the winding body (S) after winding, and the tab group (12) including a plurality of tabs (12') stacked together, the plurality of tabs (12') protruding from the main body portions (11), and in the radial direction, at least two adjacent tabs (12') in the tab group (12) are spaced apart by at least one electrode layer (111) of the same polarity.

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