Battery cell, battery, electric device, and processing method for battery cell

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), an electric device, and a processing method for a battery cell (10). The battery cell (10) comprises an electrode assembly (11) and active structures (12). The electrode assembly (11) comprises a positive electrode sheet (111) and a negative electrode sheet (112), wherein the positive electrode sheet (111) comprises first straight segments (1111) and first bent segments (1112), and the negative electrode sheet (112) comprises second straight segments (1121) and second bent segments (1122), the first straight segments (1111) and the second straight segments (1121) are alternately stacked to form straight portions (1101), and the first bent segments (1112) and the second bent segments (1122) are alternately stacked to form corner portions (1102). At least some of the active structures (12) are provided between the first bent segments (1112) and the second bent segments (1122) adjacent to the inner sides of the first bent segments (1112). In this way, the problem of ion precipitation at the corner portions can be solved.

Description

Battery cell, battery, electrical device, and battery cell processing method

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on July 28, 2023, with application number 202310942755.2 and application name "Battery Cell, Battery, Electrical Device and Processing Method of Battery Cell", all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, and a method for processing the battery cell. Background Art

[0004] In some cases, the electrode assembly is mainly formed by stacking and winding positive and negative electrode sheets, so that the electrode assembly can be divided into a straight portion and two corner portions, and the two corner portions are located on opposite sides of the straight portion.

[0005] At the corners of the electrode assembly, the positive, negative, and separators are all bent, making the winding length of the positive electrode sheet longer than the winding length of the negative electrode sheet located inside the positive electrode sheet. This results in an insufficient capacity ratio between the negative electrode sheet located inside the positive electrode sheet and the positive electrode sheet. As a result, during the charging process of the battery cell, ions released from the positive electrode sheet migrate to the inner negative electrode sheet, which lacks sufficient space to accommodate and embed these ions. This can cause ion precipitation problems at the corners, affecting the charge and discharge cycles and reliability of the battery cell.

[0006] Summary of the Invention

[0007] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery, an electrical device and a method for processing the battery cell, which can improve the problem of ion precipitation at the corners of the electrode assembly.

[0008] The technical solution adopted in the embodiment of this application is:

[0009] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0010] An electrode assembly comprising a positive electrode sheet and a negative electrode sheet, the positive electrode sheets and the negative electrode sheets being stacked and wound; the electrode assembly comprising a straight portion and two corner portions disposed on opposite sides of the straight portion; the positive electrode sheet comprising a first straight segment and a first curved segment connected to the first straight segment, and the negative electrode sheet comprising a second straight segment and a second curved segment connected to the second straight segment, the first straight segment and the second straight segment being alternately stacked to form the straight portion, and the first curved segment and the second curved segment being alternately stacked to form the corner portion;

[0011] The active structure is arranged between the first curved segment and the second curved segment adjacent to the inner side and is used for embedding ions.

[0012] The battery cell provided in the embodiments of the present application has an active structure for ion embedding disposed between a first curved segment of the electrode assembly and a second curved segment adjacent along the inner side. This allows ions released from the first curved segment to embed not only in the second curved segment but also in the active structure. This alleviates the problem of excessive ion deposition in the second curved segment, causing some ions to precipitate. This alleviates the problem of ion elution at the corners of the electrode assembly, thereby improving the charge-discharge cycle and reliability of the battery cell.

[0013] In some embodiments, the positive electrode sheet includes more than three first curved segments spaced apart along the winding direction of the positive electrode sheet; along the winding direction of the positive electrode sheet, at least the inner side of the first first curved segment to the inner side of the third first curved segment are provided with active structures between the corresponding adjacent second curved segments.

[0014] By setting the above-mentioned active structure at the first to third folds of the positive electrode sheet, the problem of ion precipitation in the areas where ion precipitation is serious in the electrode assembly can be improved, thereby improving the ion precipitation problem of the battery as a whole, and further improving the battery's charge and discharge cycle performance and reliability.

[0015] In some embodiments, the electrode assembly further includes a separator, which is stacked between the positive electrode sheet and the negative electrode sheet;

[0016] An active structure is provided between the first curved segment and the diaphragm adjacent along the inner side, and / or an active structure is provided between the second curved segment and the diaphragm adjacent along the outer side.

[0017] This makes the arrangement of the active structure in the corner part very flexible.

[0018] In some embodiments, the active structure includes a substrate and an active layer disposed on the substrate and configured to intercalate ions, wherein at least a portion of the substrate and at least a portion of the active layer are disposed between a first curved segment and an inner adjacent second curved segment.

[0019] The active structure is configured to include a substrate and an active layer provided on the substrate, so that the active structure can embed ions through the active layer, thereby improving the problem of ion precipitation at the corner portion.

[0020] In some embodiments, the active structure further comprises an adhesive layer, and the substrate and / or the active layer are provided with an adhesive layer; the electrode assembly further comprises a separator, and the separator is stacked between the positive electrode sheet and the negative electrode sheet;

[0021] At least a portion of the active structure is disposed between the first curved segment and the adjacent diaphragm along the inner side, and is bonded to the first curved segment and / or the diaphragm via an adhesive layer, or at least a portion of the active structure is disposed between the second curved segment and the adjacent diaphragm along the outer side, and is bonded to the second curved segment and / or the diaphragm via an adhesive layer.

[0022] By providing an adhesive layer, the active structure can be stably fixed to the corner portion, which can improve the problem of active structure falling off and further improve the problem of ion precipitation in the corner portion. In addition, the active structure is bonded to the corner portion via the adhesive layer, making the process of fixing the active structure to the corner portion very simple and easy to implement.

[0023] In some embodiments, the bonding layer includes a plurality of bonding portions spaced apart and distributed on the active layer or the substrate; the bonding portion of a single bonding layer is used to bond the first curved segment, the diaphragm, or the second curved segment.

[0024] Such an arrangement allows the ions released from the first curved segment to be embedded in the active structure more quickly, thereby better improving the problem of excessive ions released from the first curved segment reaching the second curved segment, and further improving the problem of ion precipitation in the corner part.

[0025] In some embodiments, the bonding portion is disposed on a side of the active structure close to the first curved segment.

[0026] Such an arrangement allows the ions released from the first curved segment to be embedded in the active structure more quickly, thereby better improving the problem of excessive ions released from the first curved segment reaching the second curved segment, and further improving the problem of ion precipitation in the corner part.

[0027] In some embodiments, the adhesive layer is disposed on the active layer and adhered to the first curved segment.

[0028] This arrangement allows the active layer to be as close as possible to the inner side of the first curved segment, thereby improving the efficiency of ion embedding from the first curved segment into the active layer, effectively alleviating the problem of ion precipitation at the corner. Furthermore, the active structure is bonded to the first curved segment, facilitating the embedding of ions from the first curved segment into the active layer, effectively alleviating the problem of ion precipitation at the corner.

[0029] In some embodiments, the adhesive layer is a conductive adhesive layer and is disposed closer to the first curved segment than to the active layer.

[0030] Such an arrangement allows the ions released from the first curved segment to be quickly embedded in the active layer under the conductive environment of the adhesive layer, thereby improving the efficiency of the reaction between the ions and the active layer and effectively improving the problem of ion precipitation at the corner portion.

[0031] In some embodiments, the adhesive layer and the active layer are disposed on opposite sides of the substrate, the adhesive layer is bonded to the diaphragm, and the active layer is in contact with the first curved segment.

[0032] With such a setting, on the basis of being able to achieve the bonding of the active structure to the corner part, the active layer can directly contact the inner side of the first curved segment, so that the ions released from the first curved segment can be directly embedded in the active layer, which improves the efficiency of the ions released from the first curved segment to be embedded in the active structure, and facilitates improving the problem of ion precipitation in the corner part.

[0033] In some embodiments, the active layer has adhesive properties; the electrode assembly further includes a diaphragm, which is stacked between the positive electrode sheet and the negative electrode sheet; and the single active layer is bonded to the first curved segment, the diaphragm, or the second curved segment.

[0034] This arrangement eliminates the need for an additional adhesive layer, making the active structure very simple. Furthermore, the ions released from the first curved segment can be quickly embedded in the active layer.

[0035] In some embodiments, the electrode assembly further includes a diaphragm, which is stacked between the positive electrode sheet and the negative electrode sheet; the substrate has insulating properties and is disposed between the first curved segment and the diaphragm adjacent along the inner side; the active layer is disposed on the side of the substrate away from the first curved segment and is conductively connected to the negative electrode sheet.

[0036] Such a setting allows the active structure to embed ions during the battery charging process and release ions during the battery discharging process. In this way, on the basis of improving the problem of ion precipitation, it can also improve the utilization rate of ions in the battery, thereby improving the battery's charge and discharge capacity.

[0037] In some embodiments, the electrode assembly further includes a diaphragm, which is stacked between the positive electrode plate and the negative electrode plate; the active structure includes an active layer for embedding ions, at least a portion of the active layer is disposed between the first curved segment and the second curved segment adjacent along the inner side, and is disposed on the diaphragm.

[0038] By directly setting the active layer on the diaphragm, the active structure eliminates the need for a substrate, which can reduce the volume and mass of the active structure, thereby helping to improve the energy density of the battery.

[0039] In some embodiments, the active layer comprises an active material, a conductive agent, and a binder.

[0040] This configuration allows the active layer to embed ions, thereby improving the problem of ion precipitation at the corners and facilitating the formation of the active layer on the substrate or the diaphragm.

[0041] In some embodiments, the electrode assembly further includes a separator, which is stacked between the positive electrode sheet and the negative electrode sheet;

[0042] At least a portion of the active structure is disposed between the second curved segment and the separator adjacent to the outer side, and is electrically connected to the negative electrode plate.

[0043] Such an arrangement allows the active structure to embed ions released from the first curved segment during the battery cell charging process, and also release ions during the battery cell discharging process and embed the ions into the first curved segment, thereby improving the charge and discharge capacity of the battery cell.

[0044] In some embodiments, the active structure includes an active layer for intercalating ions, at least a portion of the active layer being disposed between the first curved segment and a second curved segment adjacent along the inner side;

[0045] The active structure further includes a metal piece provided on the active layer, and the metal piece is conductively connected to the negative electrode plate; or the active layer is in contact and conductive with the second curved segment.

[0046] The metal part is connected to the negative electrode sheet, or the active layer is in contact with the second curved segment, so that the active structure can maintain the same potential as the negative electrode sheet, expand the potential difference between the positive electrode sheet and the active structure, increase the reaction rate of ions with the active structure, and improve the efficiency of ions released from the first curved segment to be embedded in the active structure.

[0047] In some embodiments, the orthographic projection of the active structure on the first curved segment covers the first curved segment along the winding direction of the positive electrode sheet;

[0048] And / or, the orthographic projection of the active structure on the first curved segment covers the first curved segment along the first direction, and the positive electrode sheet and the negative electrode sheet are wound around a first axis parallel to the first direction.

[0049] By adopting the above technical solution, the active structure can cover the inner side of the first curved segment as much as possible, so that the ions released from the first curved segment can be better embedded, thereby improving the problem of ion precipitation in the corner part.

[0050] In some embodiments, along the winding direction of the positive electrode sheet, the size of the active structure is 10 mm to 20 mm.

[0051] Such an arrangement enables the active structure to better cover the inner side of the first curved segment along the winding direction of the positive electrode sheet, thereby better embedding the ions released from the first curved segment.

[0052] In some embodiments, the active structure is in the form of a sheet with a thickness ranging from 20 μm to 40 μm.

[0053] Such a setting makes it possible to design the thickness of the active structure more reasonably. On the basis of being able to efficiently embed the ions released from the first curved segment, the thickness of the active structure is made smaller, thereby minimizing the space occupied by the active structure in the electrode assembly, which helps to maintain a higher energy density of the battery.

[0054] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0055] The battery provided in the embodiments of the present application, by adopting the battery cells involved in the above embodiments, can improve the problem of ion precipitation of the battery cells, which helps to improve the charge and discharge cycle performance and reliability of the battery.

[0056] In a third aspect, an embodiment of the present application provides an electrical device including a battery cell or a battery.

[0057] The electrical device provided in the embodiment of the present application, by adopting the above-mentioned battery, helps to improve the charge and discharge cycle performance and reliability of the battery.

[0058] In a fourth aspect, an embodiment of the present application provides a method for processing a battery cell, comprising:

[0059] Die-cutting the positive electrode sheet;

[0060] An active structure is provided on the inner side of the first curved segment of the positive electrode sheet;

[0061] The positive electrode sheet and the negative electrode sheet are wound.

[0062] The processing method of the battery cell provided in the embodiment of the present application can improve the problem of ion precipitation at the corner portion of the battery cell, and help to improve the charge and discharge cycle performance and reliability of the battery cell.

[0063] In a fifth aspect, an embodiment of the present application provides a method for processing a battery cell, comprising:

[0064] Die-cutting the negative electrode sheet;

[0065] An active structure is provided on the outer side of the second curved segment of the negative electrode plate;

[0066] The positive electrode sheet and the negative electrode sheet are wound.

[0067] The processing method of the battery cell provided in the embodiment of the present application can improve the problem of ion precipitation at the corner portion of the battery cell, and help to improve the charge and discharge cycle performance and reliability of the battery cell.

[0068] In a sixth aspect, an embodiment of the present application provides a method for processing a battery cell, comprising:

[0069] The positive electrode sheet and the negative electrode sheet are wound, and during the winding process, an active structure is arranged between the inner side of the first curved segment of the positive electrode sheet and the outer side of the second curved segment of the negative electrode sheet.

[0070] The processing method of the battery cell provided in the embodiment of the present application can improve the problem of ion precipitation at the corner portion of the battery cell, and help to improve the charge and discharge cycle performance and reliability of the battery cell.

[0071] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0073] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0074] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0075] FIG3 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0076] FIG4 is a cross-sectional view of the electrode assembly and active structure of a battery cell provided in some embodiments of the present application;

[0077] Figure 5 is an enlarged view of point A in Figure 4;

[0078] FIG6 is an expanded cross-sectional view of an active structure of a battery cell provided in some embodiments of the present application;

[0079] FIG7 is an expanded cross-sectional view of the active structure of a battery cell provided in some other embodiments of the present application;

[0080] FIG8 is an expanded cross-sectional view of the active structure of a battery cell provided in some other embodiments of the present application;

[0081] FIG9 is an expanded cross-sectional view of the active structure of a battery cell provided in some further embodiments of the present application;

[0082] FIG10 is a partial cross-sectional view of a corner portion and an active structure of a battery cell provided by some embodiments of the present application;

[0083] FIG11 is a flow chart of a method for processing a battery cell according to some embodiments of the present application.

[0084] In the figures, the reference numerals are: 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - housing; 21 - first part; 22-second part; 11-electrode assembly; 1101-straight part; 1102-corner part; 111-positive electrode plate; 1111-first straight segment; 1112-first curved segment; 1113-positive electrode tab; 112-negative electrode plate; 1121-second straight segment; 1122-second curved segment; 1123-negative electrode tab; 113-diaphragm; 1131-third straight segment; 1132-third curved segment; 12-active structure; 121-substrate; 122-active layer; 123-adhesive layer; 1231-adhesive part; 124-metal part; 13-shell; 131-shell; 132-end cover; Z-first direction; X-second direction; Y-third direction; L-first axis; H1-first dimension; H2-second dimension. DETAILED DESCRIPTION

[0085] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0086] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0088] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0089] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0090] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0091] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0092] In related art, a battery cell includes an electrode assembly, which is the component where electrochemical reactions occur in the battery cell. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator.

[0093] In a wound electrode assembly, the positive electrode sheet and the negative electrode sheet are stacked and wound together. A separator is provided between the positive electrode sheet and the negative electrode sheet to provide insulation between the positive electrode sheet and the negative electrode sheet.

[0094] In some cases, the electrode assembly can be divided into a straight portion and two corner portions, with the two corner portions being located on opposite sides of the straight portion. Specifically, the positive electrode sheet, the negative electrode sheet, and the separator each have a straight segment and a curved segment connected to the straight segment. The straight segments of the positive electrode sheet, the negative electrode sheet, and the separator are arranged straight and stacked to form the straight portion of the electrode assembly; the curved segments of the positive electrode sheet, the negative electrode sheet, and the separator are arranged curved and stacked to form the corner portions of the electrode assembly.

[0095] During the charging process of a battery cell, ions are released from the positive electrode, migrate to the negative electrode, and then embed into the negative electrode. Taking lithium-ion batteries as an example, during the charging process of a battery cell, lithium ions are released from the positive electrode and migrate to the negative electrode to embed into the negative electrode.

[0096] However, for the corner portion of the electrode assembly, the winding length of the positive electrode sheet is greater than the winding length of the negative electrode sheet inside the positive electrode sheet, which makes the capacity ratio of the negative electrode sheet inside the positive electrode sheet to the positive electrode sheet insufficient. In this way, when the lithium ions released from the positive electrode sheet at the corner portion migrate to the negative electrode sheet inside, the negative electrode sheet inside the positive electrode sheet does not have enough space to accommodate and embed these lithium ions. In other words, lithium ions will reach the negative electrode sheet inside in excess, causing lithium deposition on the negative electrode sheet inside. Therefore, there is a problem of lithium deposition at the corner portion, which affects the charge and discharge cycle and reliability performance of the battery cell.

[0097] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, an electrical device, and a processing method for a battery cell. By providing an active structure for embedding ions between a first curved segment and a second curved segment adjacent along the inner side, ions released from the first curved segment can be embedded not only in the second curved segment but also in the active structure. This can alleviate the problem of excessive ions reaching the second curved segment, causing some ions to precipitate. This can alleviate the problem of ion precipitate from the corners of the electrode assembly, thereby improving the charge-discharge cycle and reliability of the battery cell.

[0098] In some embodiments, the battery cells involved in the embodiments of the present application can be used in electrical devices that use battery cells or batteries as power sources. The batteries involved in the embodiments of the present application can be used in electrical devices that use batteries as power sources.

[0099] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Vehicles may include gasoline-powered vehicles, gas-powered vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid electric vehicles, or extended-range electric vehicles.

[0100] The battery involved in the embodiments of the present application can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to the multiple battery cells being connected in both series and parallel mode.

[0101] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. For example, the multiple battery cells may be fixed to form a battery module using a rolling strip or the like. For example, the multiple battery cells may also be fixed to form a battery module using end plates, side plates, or the like.

[0102] In some embodiments, the battery may be a battery pack, which may include a housing and battery cells. As an example, the battery cells may be directly housed in the housing. As an example, the battery cells may also be formed into a battery module first and then housed in the housing.

[0103] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0104] Please refer to Figure 1, which is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The above-mentioned battery 100 is provided inside the vehicle 1000. The battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and driving the vehicle 1000.

[0105] In some embodiments, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0106] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 is a structure with a storage space inside, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first portion 21 and a second portion 22, which cover each other and together define the storage space. The first portion 21 can be a hollow structure with an opening at one end, and the second portion 22 can be a plate-like structure. The second portion 22 covers the open side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the storage space. Alternatively, the first portion 21 and the second portion 22 can both be hollow structures with an opening at one end, as shown in Figure 2, with the open side of the first portion 21 covering the open side of the second portion 22, so that the first portion 21 and the second portion 22 jointly define the storage space. The housing 20 composed of the first portion 21 and the second portion 22 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0107] In some embodiments, multiple battery cells 10 can be connected in series, in parallel, or in a hybrid to form a whole, which can then be directly housed in the aforementioned accommodation space of the housing 20, as shown in FIG2 . Alternatively, multiple battery cells 10 can be first connected in series, in parallel, or in a hybrid, and then arranged and fixed to form multiple battery modules, which can then be further connected in series, in parallel, or in a hybrid to form a whole, which can then be housed in the aforementioned accommodation space of the housing 20.

[0108] In some embodiments, referring to Figures 1 and 2 , when the battery 100 is used in a vehicle, the housing 20 of the battery 100 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can become at least a portion of the chassis of the vehicle 1000, or a portion of the housing 20 can become at least a portion of a cross member or a longitudinal member of the vehicle 1000.

[0109] A battery cell 10 is the smallest unit that stores and outputs electrical energy. The battery cell 10 can be a secondary battery or a primary battery. The battery cell 10 can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 10 can be cylindrical, flat, rectangular, or other shapes.

[0110] Please refer to Figures 3 and 4 together. Figure 3 is an exploded schematic diagram of a battery cell 10 provided in some embodiments of the present application. Figure 4 is a cross-sectional view of the electrode assembly 11 and active structure 12 provided in some embodiments of the present application. The cross section shown in Figure 4 is perpendicular to the Z-axis in Figure 3. The battery cell 10 includes an electrode assembly 11 and a housing 13.

[0111] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is primarily formed by winding a positive electrode sheet 111 and a negative electrode sheet 112, with a separator 113 provided between the positive electrode sheet 111 and the negative electrode sheet 112. A portion of the positive electrode sheet 111 contains active material, and a portion of the negative electrode sheet 112 contains active material. The portion of the positive electrode sheet 111 that does not contain active material and the portion of the negative electrode sheet 112 that does not contain active material each constitute a tab. The tab of the positive electrode sheet 111 is the positive tab 1113, and the tab of the negative electrode sheet 112 is the negative tab 1123. The positive tab 1113 and the negative tab 1123 may be located together at one end of the electrode assembly 11 or at opposite ends of the electrode assembly 11.

[0112] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0113] In some embodiments, the battery cell 10 may further include an electrolyte, which acts as a conductor of ions between the positive electrode sheet 111 and the negative electrode sheet 112. The electrolyte involved in the embodiments of the present application may be liquid, gel or solid. During the charging process of the battery cell 10, the active material of the positive electrode sheet 111 releases ions, which migrate toward the negative electrode sheet 112 and are embedded in the active material of the negative electrode sheet 112. During the discharge process of the battery cell 10, ions are released from the active material of the negative electrode sheet 112 and migrate toward the positive electrode sheet 111 to be embedded in the active material of the positive electrode sheet 111.

[0114] The outer shell 13 includes a shell 131 and an end cap 132. The shell 131 and the end cap 132 are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell 131 and the end cap 132 is used to accommodate the electrode assembly 11 and the electrolyte. The shell 131 and the end cap 132 can be independent components. Specifically, the shell 131 has an opening, and the end cap 132 is covered at the opening of the shell 131 to jointly define the internal environment of the battery cell 10 with the shell 131 and isolate the internal environment of the battery cell 10 from the external environment. The shell 131 and the end cap 132 can also be an integrated structure. Specifically, a common connection surface can be formed between the end cap 132 and the shell 131 before the electrode assembly 11 is placed in the shell. When the electrode assembly 11 needs to be encapsulated after the electrode assembly 11 is placed in the shell, the end cap 132 is then covered with the shell 131.

[0115] The number of the end cap 132 may be one or two, and the two end caps 132 are respectively disposed at opposite ends of the housing 131 .

[0116] The shell 131 may be cylindrical, square, or other shapes, depending on the shape and size of the electrode assembly 11. Furthermore, the shell 131 and the end cap 132 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0117] Although the electrode assembly 11 involved in the embodiment of the present application is developed based on the lithium precipitation problem that occurs during the charging and discharging process of the battery cell 10, its application scenarios are not limited to this. It can be understood that the electrode assembly 11 involved in the embodiment of the present application can be applied to lithium-ion batteries to improve the problem of lithium precipitation; it can also be applied to sodium-ion batteries to improve the problem of sodium ion precipitation; it can also be applied to other types of battery cells 10 to improve other types of ion precipitation problems. That is, the electrode assembly 11 involved in the embodiment of the present application can be used for various types of battery cells 10 to improve the problem of ion precipitation during the charging and discharging process of the battery cell 10.

[0118] Please refer to Figures 3 to 5. Figure 4 is a cross-sectional view of the electrode assembly 11 and the active structure 12 provided in some embodiments of the present application. The cross section shown in Figure 4 is perpendicular to the Z axis (that is, the first direction Z). Figure 5 is an enlarged view of point A in Figure 4. The battery cell 10 provided in an embodiment of the present application includes an electrode assembly 11 and an active structure 12. The electrode assembly 11 includes a positive electrode sheet 111 and a negative electrode sheet 112. The positive electrode sheet 111 and the negative electrode sheet 112 are stacked and wound. The electrode assembly 11 includes a straight portion 1101 and two corner portions 1102. The two corner portions 1102 are located on opposite sides of the straight portion 1101. The positive electrode sheet 111 includes a first straight segment 1111 and a first curved segment 1112. The first curved segment 1112 is connected to the first straight segment 1111. The negative electrode tab 112 includes a second straight segment 1121 and a second curved segment 1122, with the second curved segment 1122 connected to the second straight segment 1121. The first straight segments 1111 and the second straight segments 1121 are alternately stacked to form the straight portion 1101 of the electrode assembly 11, while the first curved segments 1112 and the second curved segments 1122 are alternately stacked to form the corner portion 1102 of the electrode assembly 11. At least a portion of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent thereto along the inner side, and is used to intercalate ions.

[0119] It can be understood that the positive electrode sheet 111 and the negative electrode sheet 112 are stacked and arranged in a whole wound arrangement to form the electrode assembly 11 .

[0120] 3 and 4 , the stacked positive electrode sheet 111 and the negative electrode sheet 112 are wound around a first axis L to form an electrode assembly 11 . The first axis L passes through the center of the electrode assembly 11 and is parallel to the first direction Z.

[0121] As shown in Figures 3 and 4, the electrode assembly 11 can be divided into a straight portion 1101 and two corner portions 1102, and the two corner portions 1102 are located on opposite sides of the straight portion 1101. In Figure 4, the electrode assembly 11 is divided into the straight portion 1101 and the corner portions 1102 by dotted lines.

[0122] After the positive electrode sheet 111 and the negative electrode sheet 112 are stacked and wound to form the electrode assembly 11, as shown in FIG4 , a portion of the positive electrode sheet 111 is arranged in a straight line, representing a first straight segment 1111; another portion of the positive electrode sheet 111 is arranged in a curved line, representing a first curved segment 1112. A portion of the negative electrode sheet 112 is arranged in a straight line, representing a second straight segment 1121; another portion of the negative electrode sheet 112 is arranged in a curved line, representing a second curved segment 1122.

[0123] As shown in Figures 4 and 5, the positive electrode sheet 111 includes a plurality of first straight segments 1111 and a plurality of first curved segments 1112. Along the winding direction of the positive electrode sheet 111, the first straight segments 1111 and the first curved segments 1112 are alternately distributed and connected, so that the plurality of first straight segments 1111 and the plurality of first curved segments 1112 are connected to form the positive electrode sheet 111. Correspondingly, the negative electrode sheet 112 includes a plurality of second straight segments 1121 and a plurality of second curved segments 1122. Along the winding direction of the negative electrode sheet 112, the second straight segments 1121 and the second curved segments 1122 are alternately distributed and connected, so that the plurality of second straight segments 1121 and the second curved segments 1122 are connected to form the negative electrode sheet 112.

[0124] The winding direction of the positive electrode sheet 111 refers to the direction in which the positive electrode sheet 111 is wound from the leading end to the trailing end of the positive electrode sheet 111, with the leading end of the positive electrode sheet 111 being closer to the center of the electrode assembly 11 than the trailing end. The winding direction of the negative electrode sheet 112 refers to the direction in which the negative electrode sheet 112 is wound from the leading end to the trailing end of the negative electrode sheet 112, with the leading end of the negative electrode sheet 112 being closer to the center of the electrode assembly 11 than the trailing end.

[0125] As shown in Figures 3 to 5, a plurality of first straight segments 1111 and a plurality of second straight segments 1121 constitute the straight portion 1101 of the electrode assembly 11. Specifically, the first straight segments 1111 and the second straight segments 1121 are alternately stacked along the second direction X. It can be understood that the straight portion 1101 of the electrode assembly 11 is in a straight, extended state. Specifically, the positive electrode tab 111 located in the straight portion 1101 is the first straight segment 1111, and the negative electrode tab 112 located in the straight portion 1101 is the second straight segment 1121. That is, both the positive electrode tab 111 and the negative electrode tab 112 located in the straight portion 1101 are distributed in a straight state.

[0126] A plurality of first curved segments 1112 and a plurality of second curved segments 1122 constitute two corner portions 1102 of the electrode assembly 11, and the two corner portions 1102 are arranged on opposite sides of the straight portion 1101 along the third direction Y. In each corner portion 1102, the first curved segments 1112 and the second curved segments 1122 are alternately stacked. It can be understood that each corner portion 1102 is in a curved and extended state. Specifically, the positive electrode sheet 111 located at the corner portion 1102 is the first curved segment 1112, and the negative electrode sheet 112 located at the corner portion 1102 is the second curved segment 1122, that is, the positive electrode sheet 111 and the negative electrode sheet 112 located at the corner portion 1102 are both distributed in a curved state.

[0127] The first direction Z is perpendicular to the second direction X, the first direction Z is perpendicular to the third direction Y, and the second direction X is perpendicular to the third direction Y. As shown in Figures 3 to 5, the first direction Z is parallel to the Z axis, the second direction X is parallel to the X axis, and the third direction Y is parallel to the Y axis. The X-axis, Y-axis, and Z-axis constitute the spatial coordinate system of Figure 3, i.e., the X-axis, Y-axis, and Z-axis are three perpendicular coordinate axes in the spatial coordinate system. Furthermore, the X-axis and Y-axis constitute the planar coordinate system of Figures 4 and 5.

[0128] It can be understood that the positive electrode plate 111 includes a first straight segment 1111, a first curved segment 1112, and a positive electrode tab 1113. The first straight segment 1111 and the first curved segment 1112 are the portions of the positive electrode plate 111 containing active materials, while the portion of the positive electrode plate 111 without active materials constitutes the positive electrode tab 1113. The positive electrode tab 1113 can be conductively connected to the first straight segment 1111 or to the first curved segment 1112.

[0129] Accordingly, the negative electrode plate 112 includes a second straight segment 1121, a second curved segment 1122, and a negative electrode tab 1123. The second straight segment 1121 and the second curved segment 1122 are the portions of the negative electrode plate 112 containing active material, while the portion of the negative electrode plate 112 without active material constitutes the negative electrode tab 1123. The negative electrode tab 1123 can be conductively connected to the second straight segment 1121 or the second curved segment 1122.

[0130] The active structure 12 is a component having active materials and capable of intercalating ions. The active structure 12 is disposed at the corner portion 1102 of the electrode assembly 11 to intercalate ions in the corner portion 1102 , thereby improving the problem of ion precipitation in the corner portion 1102 .

[0131] At least a portion of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side. This means that at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 located inside and adjacent to the first curved segment 1112. It should be noted that in the corner portion 1102, the first curved segments 1112 and the second curved segments 1122 are alternately arranged. Thus, in adjacent first and second curved segments 1112, 1122 along the third direction Y, the first curved segment 1112 may be located outside the second curved segment 1122. That is, the second curved segment 1122 may be located inside the first curved segment 1112, and the active structure 12 may be disposed between the inside of the first curved segment 1112 and the outside of the second curved segment 1122.

[0132] The innermost adjacent second curved segment 1122 refers to the second curved segment 1122 located inwardly of and adjacent to the first curved segment 1112 along the third direction Y. The innermost side of the first curved segment 1112 refers to the side of the first curved segment 1112 facing the center of the electrode assembly 11 along the third direction Y. The outermost side of the second curved segment 1122 refers to the side of the second curved segment 1122 away from the center of the electrode assembly 11 along the third direction Y.

[0133] It should be noted that the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, so that the active structure 12 can embed ions released from the first curved segment 1112 .

[0134] The electrode assembly 11 provided in the embodiment of the present application has an active structure 12 for embedding ions disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side. This allows ions released from the first curved segment 1112 to embed in the active structure 12 during the charging process of the battery 100. This alleviates the problem of excessive ions reaching the second curved segment 1122, causing some ions to precipitate. This alleviates the problem of ion precipitation at the corner portion 1102 of the electrode assembly 11, thereby improving the charge-discharge cycle performance and reliability of the battery 100.

[0135] Based on the above structure, during the charging process of the battery 100, the positive electrode plate 111 releases ions, which migrate toward and embed into the negative electrode plate 112. Specifically, the ions released from the first straight segment 1111 can be embedded into the second straight segment 1121, and the ions released from the first curved segment 1112 can be partially embedded into the active structure 12 and partially embedded into the second curved segment 1122.

[0136] In addition, by providing an active structure 12 in the corner portion 1102 so that the active structure 12 is filled between the first curved segment 1112 and the second curved segment 1122, the bending curvature of the corner portion 1102 can be optimized, which helps to improve the dynamics of ion transmission in the corner portion 1102, and at the same time helps to improve the problem of easy collapse of the first curved segment 1112 of the corner portion 1102, thereby helping to make the battery 100 have better quality.

[0137] In some cases, active substances with different material ratios can be coated on the first straight segment 1111 and the first curved segment 1112 of the positive electrode sheet 111, so that the ions released from the first curved segment 1112 can match the accommodation space of the second curved segment 1122 of the negative electrode sheet 112, thereby improving the problem of ion precipitation in the corner portion 1102. However, this requires that in the process of making the positive electrode sheet 111, an intermittent coating method be used to coat the positive electrode sheet 111 with active substances with different material ratios in order to produce a special positive electrode sheet 111, which increases the difficulty of the process. The electrode assembly 11 provided in the embodiment of the present application can improve the problem of ion precipitation in the corner portion 1102 by providing an active structure 12 between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side, thereby reducing the difficulty of the process and facilitating production.

[0138] In some embodiments, referring to FIG. 4 and in conjunction with other figures, the positive electrode sheet 111 includes three or more first curved segments 1112 , which are sequentially spaced apart along the winding direction of the positive electrode sheet 111 . Along the winding direction of the positive electrode sheet 111 , at least the first to third first curved segments 1112 are provided with an active structure 12 between the first curved segment 1112 and the inner adjacent second curved segment 1122 .

[0139] Here, more than three includes three. That is, the positive electrode plate 111 includes more than three first curved segments 1112, may include three first curved segments 1112, or may include four, five, six, or more than three first curved segments 1112.

[0140] It can be understood that, along the winding direction of the positive electrode sheet 111, an active structure 12 is provided between the first first curved segment 1112 and the second curved segment 1122 adjacent to the inside, an active structure 12 is also provided between the second first curved segment 1112 and the second curved segment 1122 adjacent to the inside, and an active structure 12 is also provided between the third first curved segment 1112 and the second curved segment 1122 adjacent to the inside. Based on this, the active structure 12 on the inside of the first first curved segment 1112 can improve the problem of ion precipitation at the first first curved segment 1112, the active structure 12 on the inside of the second first curved segment 1112 can improve the problem of ion precipitation at the second first curved segment 1112, and the active structure 12 on the inside of the third first curved segment 1112 can improve the problem of ion precipitation at the third first curved segment 1112. That is, along the winding direction of the positive electrode sheet 111, active structures 12 are provided at the first to third folds of the positive electrode sheet 111 to improve the problem of ion precipitation at the first to third folds of the positive electrode sheet 111. The first first curved segment 1112 refers to the first curved segment 1112 of the positive electrode sheet 111 that is closest to the center of the electrode assembly 11.

[0141] It should be noted that during the charging process of the battery 100, ions at the first to fifth folds of the positive electrode sheet 111 tend to excessively reach the negative electrode sheet 112, causing ion precipitation. In particular, ions at the first to third folds of the positive electrode sheet 111 tend to precipitate more easily.

[0142] By arranging the above-mentioned active structure 12 at the first to third folds of the positive electrode sheet 111, the problem of ion precipitation in the areas where ion precipitation is serious in the electrode assembly 11 can be improved, thereby improving the problem of ion precipitation of the battery 100 as a whole, and further improving the charge and discharge cycle performance and reliability of the battery 100.

[0143] In some embodiments, active structures 12 may be provided at the fourth and fifth folds of the positive electrode sheet 111 , which may further improve the problem of ion precipitation at the corner portion 1102 of the electrode assembly 11 .

[0144] In some embodiments, please refer to FIG. 4 and FIG. 5 together with other drawings. The electrode assembly 11 further includes a separator 113 , which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112 .

[0145] The separator 113 is stacked between the positive electrode sheet 111 and the negative electrode sheet 112 to achieve insulation between the positive electrode sheet 111 and the negative electrode sheet 112, thereby preventing the electrode assembly 11 from internal short circuiting as much as possible.

[0146] As shown in Figures 4 and 5, the separator 113 is stacked between the positive electrode sheet 111 and the negative electrode sheet 112, and is wound with the positive electrode sheet 111 and the negative electrode sheet 112 to form the electrode assembly 11. A portion of the separator 113 is arranged in a straight state and stacked between the first straight segment 1111 of the positive electrode sheet 111 and the second straight segment 1121 of the negative electrode sheet 112. Together with the first straight segment 1111 and the second straight segment 1121, the separator 113 forms the straight portion 1101 of the electrode assembly 11. Another portion of the separator 113 is arranged in a curved state and stacked between the first curved segment 1112 of the positive electrode sheet 111 and the second curved segment 1122 of the negative electrode sheet 112. Together with the first curved segment 1112 and the second curved segment 1122, the separator 113 forms the corner portion 1102 of the electrode assembly 11.

[0147] As shown in Figures 4 and 5, the separator 113 includes a plurality of third straight segments 1131 and a plurality of third curved segments. Along the winding direction of the separator 113, the third straight segments 1131 and the third curved segments 1132 are alternately distributed and connected, so that the plurality of third straight segments 1131 and the plurality of third curved segments 1132 are connected to form the separator 113. The winding direction of the separator 113 refers to the direction in which the separator 113 is wound from the leading end to the trailing end of the separator 113. The leading end of the separator 113 is closer to the center of the electrode assembly 11 than the trailing end.

[0148] As shown in Figures 4 and 5, the separator 113 located in the straight portion 1101 is a third straight segment 1131. The third straight segment 1131 is disposed between the first straight segment 1111 and the second straight segment 1121 along the second direction X. Together with the first straight segment 1111 and the second straight segment 1121, the third straight segment 1131 forms the straight portion 1101, thereby allowing the straight portion 1101 of the electrode assembly 11 to extend in a straight manner. The separator 113 located in the corner portion 1102 is a third curved segment 1132. The third curved segment 1132 is disposed between the first curved segment 1112 and the second curved segment 1122. Together with the first curved segment 1112 and the second curved segment 1122, the third curved segment 1132 forms the corner portion 1102, thereby allowing the corner portion 1102 of the electrode assembly 11 to extend in a curved manner.

[0149] The third straight segment 1131 is located between the first straight segment 1111 and the second straight segment 1121 to provide insulation between the first straight segment 1111 and the second straight segment 1121. The third curved segment 1132 is located between the first curved segment 1112 and the second curved segment 1122 to provide insulation between the first curved segment 1112 and the second curved segment 1122. In this way, the separator 113 provides insulation between the positive electrode sheet 111 and the negative electrode sheet 112.

[0150] In some embodiments, referring to Figures 4 and 5 together, and in conjunction with other figures, an active structure 12 is provided between the first curved segment 1112 and the innermost adjacent diaphragm 113. Alternatively, an active structure 12 is provided between the second curved segment 1122 and the outermost adjacent diaphragm 113. Alternatively, an active structure 12 is provided between the first curved segment 1112 and the innermost adjacent diaphragm 113, and an active structure 12 is provided between the second curved segment 1122 and the outermost adjacent diaphragm 113.

[0151] It can be understood that at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, that is, at least a portion of the active structure 12 is disposed on the inner side of the first curved segment 1112 and between the second curved segment 1122 located on the inner side of the first curved segment 1112 and adjacent to the first curved segment 1112. Specifically, at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the septum 113 adjacent along the inner side, that is, the active structure 12 is disposed on the inner side of the first curved segment 1112 and between the septum 113 located on the inner side of the first curved segment 1112 and adjacent to the first curved segment 1112; or, at least a portion of the active structure 12 is disposed between the second curved segment 1122 and the septum 113 adjacent along the outer side, that is, at least a portion of the active structure 12 is disposed on the outer side of the second bend and between the septum 113 located on the outer side of the second curved segment 1122 and adjacent to the second curved segment 1122.

[0152] Based on this, when there is only one active structure 12, at least a portion of the active structure 12 can be disposed between the first curved segment 1112 and the innermost adjacent septum 113, or between the second curved segment 1122 and the outermost adjacent septum 113. When there are multiple active structures 12, the multiple active structures 12 can all be disposed between the first curved segment 1112 and the innermost adjacent septum 113; or all be disposed between the second curved segment 1122 and the outermost adjacent septum 113; or at least one active structure 12 can be disposed between the first curved segment 1112 and the innermost adjacent septum 113, and at least one active structure 12 can be disposed between the second curved segment 1122 and the outermost adjacent septum 113.

[0153] By placing at least a portion of the active structure 12 between the first curved segment 1112 and the inner adjacent diaphragm 113, or between the second curved segment 1122 and the outer adjacent diaphragm 113, the active structure 12 can be positioned inside the first curved segment 1112. This allows ions released from the first curved segment 1112 to be embedded in the inner active structure 12, thereby alleviating the ion leaching problem at the corner portion 1102. This allows for greater flexibility in the placement of the active structure 12 at the corner portion 1102.

[0154] In some embodiments, please refer to Figures 5 and 6 together, in conjunction with other figures. Figure 6 is a schematic diagram of an unfolded cross-section of the active structure 12 of the battery cell 10 provided in some embodiments of the present application. The cross-section shown in Figure 6 is perpendicular to the Z-axis (i.e., the first direction Z). That is, Figure 6 is a schematic diagram of the active structure 12 of the structure shown in Figure 4 in an unfolded state. It should be noted that the first curved segment 1112 and the second curved segment 1122 are arranged so that when at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, the active structure 12 is also in a curved state. The active structures 12 illustrated in Figures 6 to 9 are all in a straight state, that is, in an unfolded state. The active structure 12 includes a substrate 121 and an active layer 122. The active layer 122 is disposed on the substrate 121 and is used to embed ions. At least a portion of the substrate 121 and at least a portion of the active layer 122 are both disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side.

[0155] The substrate 121 refers to the base portion of the active structure 12 , and is used to receive the active layer 122 so that the active layer 122 can be formed on the substrate 121 .

[0156] The active layer 122 refers to a portion of the active structure 12 having active materials. The active layer 122 can be used to embed ions.

[0157] The substrate 121 and the active layer 122 are both disposed on the inner side of the first curved segment 1112 and between the second curved segment 1122 located on the inner side of the first curved segment 1112 and adjacent to the first curved segment 1112. When the active structure 12 is disposed between the first curved segment 1112 and the innermost adjacent diaphragm 113, the substrate 121 and the active layer 122 are both disposed between the first curved segment 1112 and the innermost adjacent diaphragm 113. When the active structure 12 is disposed between the second curved segment 1122 and the outermost adjacent diaphragm 113, the substrate 121 and the active layer 122 are both disposed between the second curved segment 1122 and the outermost adjacent diaphragm 113.

[0158] Based on the above structure, during the charging process of the battery 100, the ions released from the first curved segment 1112 can be embedded in the second curved segment 1122 and can also be embedded in the active layer 122 of the active structure 12, thereby improving the problem of excessive ions reaching the second curved segment 1122 and causing ion precipitation.

[0159] The active structure 12 is configured to include a substrate 121 and an active layer 122 provided on the substrate 121 so that the active structure 12 can embed ions through the active layer 122 , thereby improving the problem of ion precipitation at the corner portion 1102 .

[0160] In some embodiments, the substrate 121 can be made of a material with a certain heat resistance, so that the active structure 12 can maintain normal use after the electrode assembly 11 generates heat, so that the active structure 12 can embed ions normally, thereby improving the problem of ion precipitation.

[0161] For example, the substrate 121 may be made of, but is not limited to, biaxially oriented polypropylene film, polyethylene, polypropylene, polyimide, polyethylene terephthalate, or the like.

[0162] In some embodiments, as shown in Figures 5 and 6 , the active layer 122 and the substrate 121 are sequentially arranged along the thickness direction of the substrate 121. Furthermore, when the active structure 12 is disposed at the corner portion 1102, the active layer 122 can be arranged parallel to the first curved segment 1112, thereby facilitating efficient ion embedding in the active layer 122 and improving ion leaching.

[0163] In some embodiments, please refer to Figures 5 to 7 together, and in combination with other drawings. Among them, Figure 7 is an expanded cross-sectional view of the active structure 12 of the battery cell 10 provided in other embodiments of the present application. The cross section shown in Figure 7 is perpendicular to the Z axis (that is, the first direction Z). That is, Figure 7 is a schematic diagram of the active structure 12 of the structure shown in Figure 4 in an expanded state. The active structure 12 also includes an adhesive layer 123. In some possible designs, as shown in Figure 6, the active layer 122 is provided with an adhesive layer 123; or, in some possible designs, as shown in Figure 7, the substrate 121 is provided with an adhesive layer 123; or, in some possible designs, both the substrate 121 and the active layer 122 are provided with an adhesive layer 123.

[0164] The electrode assembly 11 further includes a separator 113 , which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112 .

[0165] At least a portion of the active structure 12 may be disposed between the first curved segment 1112 and the inner adjacent diaphragm 113 , or at least a portion of the active structure 12 may also be disposed between the second curved segment 1122 and the outer adjacent diaphragm 113 .

[0166] When at least a portion of the active structure 12 is arranged between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, one side of the active structure 12 is provided with an adhesive layer 123, and is bonded to the first curved segment 1112 through the adhesive layer 123; or, the other side of the active structure 12 is provided with an adhesive layer 123, and is bonded to the diaphragm 113 through the adhesive layer 123; or, the active structure 12 is provided with adhesive layers 123 on both opposite sides, and is respectively bonded to the first curved segment 1112 and the diaphragm 113 through the adhesive layers 123 on the opposite sides.

[0167] When at least a portion of the active structure 12 is arranged between the second curved segment 1122 and the diaphragm 113 adjacent along the outside, one side of the active structure 12 is provided with an adhesive layer 123, and is bonded to the second curved segment 1122 through the adhesive layer 123; or, the other side of the active structure 12 is provided with an adhesive layer 123, and is bonded to the diaphragm 113 through the adhesive layer 123; or, adhesive layers 123 are provided on both opposite sides of the active structure 12, and are respectively bonded to the second curved segment 1122 and the diaphragm 113 through the adhesive layers 123 on the opposite sides.

[0168] The adhesive layer 123 is a component with adhesive properties on the active structure 12. For example, it can be double-sided tape, structural adhesive, etc.

[0169] When the active layer 122 is provided with an adhesive layer 123, as shown in FIG6 , the adhesive layer 123 is provided on the side of the active layer 122 away from the substrate 121. When the substrate 121 is provided with an adhesive layer 123, as shown in FIG7 , the adhesive layer 123 is provided on the side of the substrate 121 away from the active layer 122.

[0170] It should be noted that when at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the inner adjacent diaphragm 113, in some possible designs, the active structure 12 is bonded to the first curved segment 1112 via an adhesive layer 123, specifically, the adhesive layer 123 is bonded to the inner side of the first curved segment 1112. Accordingly, when the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112, the adhesive layer 123 is disposed on the side of the active layer 122 facing away from the substrate 121; when the active layer 122 is disposed on the side of the substrate 121 facing away from the first curved segment 1112, the adhesive layer 123 is disposed on the side of the substrate 121 facing away from the active layer 122. In other possible designs, the active structure 12 is bonded to the diaphragm 113 via the adhesive layer 123, specifically, the adhesive layer 123 is bonded to the outer side of the diaphragm 113. Based on this, when the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112, the adhesive layer 123 is disposed on the side of the substrate 121 away from the active layer 122. When the active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112, the adhesive layer 123 is disposed on the side of the active layer 122 away from the substrate 121. In other possible designs, the active structure 12 is bonded to the first curved segment 1112 and the diaphragm 113 via the adhesive layer 123. Specifically, adhesive layers 123 are disposed on both the side of the substrate 121 away from the active layer 122 and the side of the active layer 122 away from the substrate 121, i.e., two adhesive layers 123 are provided. One adhesive layer 123 is bonded to the inner side of the first curved segment 1112, and the other adhesive layer 123 is bonded to the outer side of the diaphragm 113.

[0171] When at least a portion of the active structure 12 is disposed between the second curved segment 1122 and the outer adjacent diaphragm 113, in some possible designs, the active structure 12 is bonded to the second curved segment 1122 via an adhesive layer 123, specifically, the adhesive layer 123 is bonded to the outer side of the second curved segment 1122. Accordingly, when the active layer 122 is disposed on the side of the substrate 121 facing the second curved segment 1122, the adhesive layer 123 is disposed on the side of the active layer 122 facing away from the substrate 121; when the active layer 122 is disposed on the side of the substrate 121 facing away from the second curved segment 1122, the adhesive layer 123 is disposed on the side of the substrate 121 facing away from the active layer 122. In other possible designs, the active structure 12 is bonded to the diaphragm 113 via the adhesive layer 123, specifically, the adhesive layer 123 is bonded to the inner side of the diaphragm 113. Based on this, when the active layer 122 is disposed on the side of the substrate 121 facing the second curved segment 1122, the adhesive layer 123 is disposed on the side of the substrate 121 away from the active layer 122. When the active layer 122 is disposed on the side of the substrate 121 away from the second curved segment 1122, the adhesive layer 123 is disposed on the side of the active layer 122 away from the substrate 121. In other possible designs, the active structure 12 is bonded to the second curved segment 1122 and the diaphragm 113 via the adhesive layer 123. Specifically, adhesive layers 123 are disposed on both the side of the substrate 121 away from the active layer 122 and the side of the active layer 122 away from the substrate 121, i.e., two adhesive layers 123 are provided. One adhesive layer 123 is bonded to the outside of the second curved segment 1122, and the other adhesive layer 123 is bonded to the inside of the diaphragm 113.

[0172] By providing the adhesive layer 123, the active structure 12 can be stably fixed to the corner portion 1102, thereby improving the problem of the active structure 12 falling off, and further improving the problem of ion precipitation in the corner portion 1102. In addition, the active structure 12 is bonded to the corner portion 1102 via the adhesive layer 123, making the process of fixing the active structure 12 to the corner portion 1102 very simple and easy to implement.

[0173] In some embodiments, please refer to Figures 5, 6 and 8 together, and in combination with other drawings. Among them, Figure 8 is an expanded cross-sectional view of the active structure 12 of the electrode assembly 11 provided in some other embodiments of the present application. The cross section shown in Figure 8 is perpendicular to the Z axis (that is, the first direction Z). That is, Figure 8 is a schematic diagram of the active structure 12 of the structure shown in Figure 4 in an expanded state. The single bonding layer 123 includes a plurality of bonding portions 1231 spaced apart on the active layer 122 or the substrate 121. The bonding portion 1231 of the single bonding layer 123 is used to bond the first curved segment 1112, the diaphragm 113 or the second curved segment 1122.

[0174] The adhesive portion 1231 is a portion of the adhesive layer 123 , and each adhesive portion 1231 is used to perform an adhesive function.

[0175] It is understood that a single adhesive layer 123 can be bonded to the first curved segment 1112 , the diaphragm 113 , or the second curved segment 1122 .

[0176] 8 , when the adhesive layer 123 is disposed on the active layer 122 , the adhesive portions 1231 of the adhesive layer 123 are spaced apart on the active layer 122 . When the adhesive layer 123 is disposed on the substrate 121 , the adhesive portions 1231 of the adhesive layer 123 are spaced apart on the substrate 121 .

[0177] When the adhesive layer 123 is bonded to the first curved segment 1112, the adhesive portion 1231 is bonded to the first curved segment 1112. When the adhesive layer 123 is bonded to the diaphragm 113, the adhesive portion 1231 is bonded to the diaphragm 113. When the adhesive layer 123 is bonded to the second curved segment 1122, the adhesive portion 1231 is bonded to the second curved segment 1122.

[0178] By dividing the adhesive layer 123 into a plurality of adhesive portions 1231 , the amount of adhesive layer 123 used can be reduced, thereby helping to improve the energy density of the battery 100 .

[0179] In some embodiments, the bonding portion 1231 is disposed on a side of the active structure 12 close to the first curved segment 1112 .

[0180] It can be understood that when the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112, the adhesive portion 1231 is disposed on the side of the active layer 122 facing away from the substrate 121. When the active layer 122 is disposed on the side of the substrate 121 facing away from the first curved segment 1112, the adhesive portion 1231 is disposed on the side of the substrate 121 facing away from the active layer 122. Based on this, the adhesive portion 1231 can be disposed on the side of the active structure 12 near the first curved segment 1112. When at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the innermost adjacent diaphragm 113, the active structure 12 is bonded to the inner side of the first curved segment 1112 via the adhesive portion 1231. When the active structure 12 is disposed between the second curved segment 1122 and the outermost adjacent diaphragm 113, the active structure 12 is bonded to the inner side of the diaphragm 113 via the adhesive portion 1231.

[0181] By arranging multiple adhesive portions 1231 in an intermittent distribution, when the active structure 12 is arranged between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, the inner side of the first curved segment 1112 can directly contact the substrate 121 or the active layer 122 through the gap between the adhesive portions 1231 and the adhesive portions 1231, thereby increasing the contact area between the inner side of the first curved segment 1112 and the substrate 121 or increasing the contact area between the inner side of the first curved segment 1112 and the active layer 122 while maintaining a better bonding effect between the active structure 12 and the first curved segment 1112. When the active structure 12 is disposed between the second curved segment 1122 and the outer adjacent diaphragm 113, the inner side of the diaphragm 113 can directly contact the substrate 121 or the active layer 122 through the gap between the adhesive portion 1231 and the adhesive portion 1231. This increases the contact area between the inner side of the diaphragm 113 and the substrate 121, or between the inner side of the diaphragm 113 and the active layer 122, while maintaining a good bonding effect between the active structure 12 and the diaphragm 113. This arrangement allows ions released from the first curved segment 1112 to be more quickly embedded in the active structure 12, thereby effectively alleviating the problem of ions released from the first curved segment 1112 excessively reaching the second curved segment 1122, and further alleviating the problem of ion precipitation in the corner portion 1102.

[0182] In some embodiments, please refer to FIG. 5 and FIG. 6 together with other figures. The adhesive layer 123 is disposed on the active layer 122 and adhered to the first curved segment 1112 .

[0183] As shown in FIG6 , and in conjunction with FIG5 , the active structure 12 is disposed between the first curved segment 1112 and the inner adjacent diaphragm 113 . Furthermore, the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112 , and the adhesive layer 123 is disposed on the side of the active layer 122 facing away from the substrate 121 . The adhesive layer 123 is bonded to the inner side of the first curved segment 1112 .

[0184] This arrangement allows the active layer 122 to be as close as possible to the inner side of the first curved segment 1112, thereby improving the efficiency of ions released from the first curved segment 1112 being embedded in the active layer 122, effectively alleviating the problem of ion precipitation at the corner portion 1102. Furthermore, the active structure 12 is bonded to the first curved segment 1112, facilitating the embedding of ions released from the first curved segment 1112 into the active layer 122, effectively alleviating the problem of ion precipitation at the corner portion 1102.

[0185] It should be noted that, referring to Figures 5, 6, and 8, when the bonding layer 123 includes multiple bonding portions 1231, the bonding portions 1231 are spaced apart on the side of the active layer 122 away from the substrate 121 and are all bonded to the inner side of the first curved segment 1112. This increases the area of ​​direct contact between the active layer 122 and the inner side of the first curved segment 1112, allowing ions released from the first curved segment 1112 to be directly embedded in the active layer 122, thereby improving the efficiency of ion embedding into the active structure 12 and effectively alleviating the problem of ion precipitation at the corner portion 1102.

[0186] In some embodiments, please refer to FIG. 5 to FIG. 8 in conjunction with other drawings. The adhesive layer 123 is a conductive adhesive layer and is disposed closer to the first curved segment 1112 than the active layer 122 .

[0187] The conductive adhesive layer refers to an adhesive layer made of conductive adhesive, and the conductive adhesive layer has conductive properties.

[0188] In some possible designs, the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112, and the adhesive layer 123 is disposed on the side of the active layer 122 facing away from the substrate 121. In other possible designs, the active layer 122 is disposed on the side of the substrate 121 facing away from the first curved segment 1112, and the adhesive layer 123 is disposed on the side of the substrate 121 facing away from the active layer 122. Based on the above design, the adhesive layer 123 is disposed closer to the first curved segment 1112 than the active layer 122. When the active structure 12 is disposed between the first curved segment 1112 and the adjacent diaphragm 113 along the inner side, the adhesive layer 123 adheres to the inner side of the first curved segment 1112; when the active structure 12 is disposed between the second curved segment 1122 and the adjacent diaphragm 113 along the outer side, the adhesive layer 123 adheres to the inner side of the diaphragm 113.

[0189] Thus, by positioning the adhesive layer 123 closer to the first curved segment 1112 relative to the active layer 122, ions released from the first curved segment 1112 must pass through the adhesive layer 123 before being embedded in the active layer 122. Furthermore, since the adhesive layer 123 is a conductive adhesive layer, the active structure 12 can be stably bonded to the corner portion 1102. Ions released from the first curved segment 1112 can be quickly embedded in the active layer 122 under the conductive environment of the adhesive layer 123, thereby improving the efficiency of the reaction between the ions and the active layer 122 and effectively alleviating the problem of ion precipitation in the corner portion 1102.

[0190] In some embodiments, the adhesive layer 123 can be made of an adhesive and conductive particles. The adhesive can include at least one of acrylic and polyester materials, and the conductive particles can include at least one of gold, silver, copper, aluminum, nickel, gold oxide, silver oxide, copper oxide, aluminum oxide, nickel oxide, graphene, and graphite. This configuration ensures that the adhesive layer 123 has excellent bonding properties, allowing the active structure 12 to be stably bonded to the corner portion 1102. Furthermore, the adhesive layer 123 is also conductive, thereby improving the efficiency of ions released from the first curved segment 1112 being embedded in the active structure 12, thereby improving the problem of ion precipitation at the corner portion 1102.

[0191] In some embodiments, the adhesive layer 123 and the active layer 122 are disposed on opposite sides of the substrate 121 , the adhesive layer 123 is bonded to the diaphragm 113 , and the active layer 122 is in contact with the first curved segment 1112 .

[0192] The active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112 and contacts the inner side of the first curved segment 1112. The adhesive layer 123 is disposed on the side of the substrate 121 away from the active layer 122 and adheres to the outer side of the diaphragm 113.

[0193] With such a configuration, while enabling the active structure 12 to be bonded to the corner portion 1102, the active layer 122 can directly contact the inner side of the first curved segment 1112, so that the ions released from the first curved segment 1112 can be directly embedded in the active layer 122, thereby improving the efficiency of the ions released from the first curved segment 1112 to be embedded in the active structure 12, thereby improving the problem of ion precipitation in the corner portion 1102.

[0194] In some embodiments, please refer to Figure 9, and combine it with other drawings. Among them, Figure 9 is an expanded cross-sectional view of the active structure 12 of the electrode assembly 11 provided in some other embodiments of the present application. The cross section shown in Figure 9 is perpendicular to the Z axis (that is, the first direction Z). That is, Figure 9 is a schematic diagram of the active structure 12 of the structure shown in Figure 4 in an expanded state. The active layer 122 has bonding properties. The electrode assembly 11 also includes a diaphragm 113, which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112. A single active layer 122 is bonded to the first curved segment 1112, the diaphragm 113 or the second curved segment 1122.

[0195] When at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the innermost adjacent diaphragm 113, and the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112, the active layer 122 is bonded to the inner side of the first curved segment 1112. When at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the innermost adjacent diaphragm 113, and the active layer 122 is disposed on the side of the substrate 121 facing away from the first curved segment 1112, the active layer 122 is bonded to the outer side of the diaphragm 113.

[0196] When at least a portion of the active structure 12 is disposed between the second curved segment 1122 and the outer adjacent diaphragm 113, and the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112, the active layer 122 is bonded to the inner side of the diaphragm 113. When at least a portion of the active structure 12 is disposed between the second curved segment 1122 and the outer adjacent diaphragm 113, and the active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112, the active layer 122 is bonded to the outer side of the second curved segment 1122.

[0197] This arrangement eliminates the need for an additional adhesive layer 123, simplifying the structure of the active structure 12. Furthermore, ions released from the first curved segment 1112 can be quickly embedded in the active layer 122. Furthermore, the space occupied by the active structure 12 within the electrode assembly 11 can be reduced, helping to increase the energy density of the battery 100.

[0198] In some embodiments, please refer to Figures 5 and 7 together, and in conjunction with other figures. The electrode assembly 11 also includes a separator 113, which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112. The substrate 121 has insulating properties and is disposed between the first curved segment 1112 and the separator 113 adjacent to it along the inner side. The active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112 and is electrically connected to the negative electrode sheet 112.

[0199] The active layer 122 is electrically connected to the negative electrode sheet 112. This can be done by connecting the active layer 122 to the second curved segment 1122 of the negative electrode sheet 112, connecting the active layer 122 to the second straight segment 1121 of the negative electrode sheet 112, or connecting the active layer 122 to the negative electrode tab 1123 of the negative electrode sheet 112. As an example, the active layer 122 is electrically connected to the negative electrode tab 1123 via a metal member 124 described below.

[0200] The substrate 121 is disposed between the first curved segment 1112 and the inner adjacent diaphragm 113, and the active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112. Thus, the substrate 121 is disposed between the first curved segment 1112 and the active layer 122. Since the substrate 121 has insulating properties, an insulating effect can be achieved between the active layer 122 and the first curved segment 1112.

[0201] Furthermore, due to the electrical connection between the active layer 122 and the negative electrode sheet 112, the active structure 12 can maintain the same potential as the negative electrode sheet 112, thereby creating a larger potential difference between the positive electrode sheet 111 and the active structure 12, thereby increasing the reaction rate between the ions and the active structure 12. In this way, the active structure 12 can not only embed ions released from the first curved segment 1112, but also release ions to allow ions to be embedded in the first curved segment 1112, that is, the active structure 12 can de-embed ions.

[0202] Based on the above structure, during the charging process of the battery cell 10, the positive electrode plate 111 releases ions, which migrate toward and embed into the negative electrode plate 112. Specifically, the ions released from the first straight segment 1111 can be embedded into the second straight segment 1121, and the ions released from the first curved segment 1112 can partially be embedded into the second curved segment 1122, while the remaining portion can be embedded into the active structure 12, specifically, after passing through the substrate 121, they can be embedded into the active layer 122.

[0203] During the discharge process of the battery cell 10, the negative electrode plate 112 releases ions and embeds them into the positive electrode plate 111. Specifically, the ions released from the second straight segment 1121 embed into the first straight segment 1111, and the ions released from the second curved segment 1122 embed into the first curved segment 1112. Furthermore, the active structure 12 can release ions, which can then embed into the first curved segment 1112.

[0204] That is, during the charging process of the battery 100, ions are released from the positive electrode tab 111 and embedded in the negative electrode tab 112 and the active structure 12. During the discharging process of the battery cell 10, ions are released from the negative electrode tab 112 and the active structure 12 and embedded in the positive electrode tab 111.

[0205] Such a configuration allows the active structure 12 to embed ions during the charging process of the battery cell 10 and release ions during the discharging process of the battery cell 10. In this way, on the basis of improving the problem of ion precipitation, the consumption of ions can be reduced, so that more ions can be embedded and released, so as to improve the utilization rate of ions in the battery cell 10, thereby improving the charge and discharge capacity of the battery cell 10, and further improving the charge and discharge performance of the battery cell 10.

[0206] It should be noted that, as shown in Figures 5 and 7 , when the active structure 12 is bonded to the inner side of the first curved segment 1112, the adhesive layer 123 is disposed on the side of the substrate 121 away from the active layer 122 and adheres to the inner side of the first curved segment 1112. When the active structure 12 is bonded to the diaphragm 113, the adhesive layer 123 is disposed on the side of the active layer 122 away from the substrate 121 and adheres to the outer side of the diaphragm 113. This allows the substrate 121 to provide insulation between the first curved segment 1112 and the active layer 122.

[0207] It should also be noted that when at least a portion of the active structure 12 is disposed between the second curved segment 1122 and the outer adjacent separator 113, regardless of whether the substrate 121 of the active structure 12 has insulating properties, the separator 113 can provide insulation between the active structure 12 and the first curved segment 1112. This allows electrical conduction between the active layer 122 and the negative electrode sheet 112, enabling the active structure 12 to release ions and embed into the first curved segment 1112 during discharge of the battery cell 10, thereby still improving the charge and discharge capacity of the battery 100.

[0208] Among them, the active layer 122 is conductively connected to the negative electrode plate 112. In addition to being conductively connected to at least one of the second curved segment 1122, the second straight segment 1121, and the negative electrode tab 1123 of the negative electrode plate 112 through the metal part 124 mentioned below, the active layer 122 can also be directly in contact with the second curved segment 1122 to achieve the conductive effect between the active layer 122 and the negative electrode plate 112.

[0209] It should also be noted that when at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the separator 113 adjacent along the inner side, and the substrate 121 is not made of an insulating material; or when at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the separator 113 adjacent along the inner side, and the active layer 122 is not electrically connected to the negative electrode tab 112; or when at least a portion of the active structure 12 is disposed between the second curved segment 1122 and the separator 113 adjacent along the outer side, and the active structure 12 is not electrically connected to the negative electrode tab 112, during the charging process of the battery 100, some of the ions released from the first curved segment 1112 are embedded in the second curved segment 1122, while others are embedded in the active structure 12 and consumed by the active structure 12. This can alleviate the problem of ion precipitation.

[0210] In some embodiments, the electrode assembly 11 further includes a separator 113, which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112. The active structure 12 includes an active layer 122, which is used to intercalate ions. At least a portion of the active layer 122 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, and is disposed on the separator 113.

[0211] The active layer 122 is a component in the active structure 12 for intercalating ions.

[0212] It can be understood that the diaphragm 113 serves as the substrate 121 of the active layer 122 , that is, the active layer 122 can be directly formed on the diaphragm 113 .

[0213] In some possible designs, the active layer 122 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, and is disposed on the outer side of the diaphragm 113 .

[0214] In some other possible designs, the active layer 122 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side, and is disposed on the inner side of the diaphragm 113 .

[0215] By directly disposing the active layer 122 on the separator 113 , the active structure 12 eliminates the need for the substrate 121 , which can reduce the volume and mass of the active structure 12 , thereby helping to improve the energy density of the battery 100 .

[0216] In some embodiments, the active layer 122 may be directly disposed on the inner side of the first curved segment 1112 or directly disposed on the outer side of the second curved segment 1122 .

[0217] In some embodiments, the active layer 122 is made of an active material, a conductive agent, and a binder.

[0218] The active material can be graphite, or other high-capacity materials such as hard carbon, silicon-carbon, silicon-oxygen, or titanium oxide. The conductive agent can be made of conductive carbon, carbon nanotubes, or graphene. This allows the active layer 122 to intercalate ions and release ions.

[0219] The binder can be water-based or oil-based, such as styrene-butadiene rubber, polyvinylidene fluoride, carboxymethyl cellulose, etc. In this way, the active layer 122 can be directly formed on the substrate 121 or the diaphragm 113, which facilitates the formation of the active layer 122 on the substrate 121 or the diaphragm 113.

[0220] This configuration enables the active layer 122 to have the ability to embed ions, thereby enabling ions to be embedded, thereby improving the problem of ion precipitation at the corner portion 1102. Furthermore, it is also beneficial to the formation of the active layer 122.

[0221] It should be noted that by increasing the proportion of adhesive in the active layer 122 , the active layer 122 can have certain adhesive properties so that the active layer 122 can be directly bonded to the first curved segment 1112 , the diaphragm 113 or the second curved segment 1122 .

[0222] In some embodiments, the electrode assembly 11 further includes a separator 113, which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112. At least a portion of the active structure 12 is disposed between the outer side of the second curved segment 1122 and the adjacent separator 113, and is electrically connected to the negative electrode sheet 112.

[0223] It can be understood that the active structure 12 includes an active layer 122 . The active layer 122 is disposed between the second curved segment 1122 and the separator 113 adjacent to the outer side, and is electrically connected to the negative electrode plate 112 .

[0224] In this way, the active structure 12 can embed ions released from the first curved segment 1112 during charging of the battery cell 10 , and can also release ions and embed them into the first curved segment 1112 during discharging of the battery cell 10 , thereby improving the charge and discharge capacity of the battery cell 10 .

[0225] In some embodiments, please refer to Figures 6 to 10 in conjunction with other figures. Figure 10 is a partial cross-sectional view of a corner portion 1102 and an active structure of an electrode assembly 11 of a battery cell 10 provided in some embodiments of the present application. The cross-section shown in Figure 10 is perpendicular to the X-axis (i.e., the second direction X). The active structure 12 includes an active layer 122, which is used to embed ions. At least a portion of the active layer 122 is disposed between a first curved segment 1112 and an inner adjacent second curved segment 1122.

[0226] As shown in FIG10 , the active structure 12 further includes a metal member 124 disposed on the active layer 122 , and the metal member 124 is conductively connected to the negative electrode plate 112 . Alternatively, the active layer 122 is in contact with and conductively connected to the second curved segment 1122 .

[0227] The metal member 124 may be copper foil, aluminum foil, or the like.

[0228] As shown in FIG. 6 to FIG. 9 , the metal member 124 is disposed on the active layer 122 and is electrically connected to the active layer 122 .

[0229] The metal part 124 is conductively connected to the negative electrode plate 112, and the metal part 124 can be conductively connected to the second straight segment 1121 of the negative electrode plate 112; or the metal part 124 can be conductively connected to the second curved segment 1122 of the negative electrode plate 112; as shown in Figure 10, the metal part 124 can also be conductively connected to the negative electrode tab 1123 of the negative electrode plate 112.

[0230] The metal member 124 and the negative electrode plate 112 can be electrically connected by welding, bonding, or the like.

[0231] The metal part 124 is conductively connected to the negative electrode plate 112, or the active layer 122 is in contact and conductive with the second curved segment 1122, so that the active structure 12 can maintain the same potential as the negative electrode plate 112, expand the potential difference between the positive electrode plate 111 and the active structure 12, increase the reaction rate of ions with the active structure 12, and improve the efficiency of ions released from the first curved segment 1112 being embedded in the active structure 12.

[0232] It can be understood that the active layer 122 is conductively connected to the negative electrode sheet 112, and the active layer 122 can be conductively connected to the second straight segment 1121 of the negative electrode sheet 112; the active layer 122 can be conductively connected to the second curved segment 1122 of the negative electrode sheet 112; or the active layer 122 can be conductively connected to the negative electrode tab 1123 of the negative electrode sheet 112.

[0233] When the active layer 122 is disposed between the first curved segment 1112 and the inner adjacent separator 113, the active layer 122 can be electrically connected to the negative electrode tab 112 via the metal member 124. Specifically, the metal member 124 is electrically connected to the active layer 122. Furthermore, the metal member 124 is electrically connected to the second straight segment 1121, or to the second curved segment 1122, or to the negative electrode tab 1123.

[0234] When the active layer 122 is disposed between the second curved segment 1122 and the outer adjacent separator 113, in addition to utilizing the metal member 124 to achieve electrical connection with the negative electrode plate 112, the active layer 122 can also directly contact and conduct electrical connection with the second curved segment 1122. The method for utilizing the metal member 124 to achieve electrical connection with the negative electrode plate 112 is the same as explained in the previous paragraph and will not be repeated here.

[0235] In some embodiments, referring to FIG5 and in conjunction with other drawings, the orthographic projection of the active structure 12 on the first curved segment 1112 covers the first curved segment 1112 along the winding direction of the positive electrode sheet 111 .

[0236] In some embodiments, referring to FIG10 and other figures, the orthographic projection of the active structure 12 on the first curved segment 1112 covers the first curved segment 1112 along the first direction Z, and the positive electrode sheet 111 and the negative electrode sheet 112 are wound around a first axis L parallel to the first direction Z.

[0237] In some embodiments, please refer to Figures 5 and 10 together, and in combination with other figures, the positive projection of the active structure 12 on the first curved segment 1112 covers the first curved segment 1112 along the winding direction of the positive electrode plate 111, and the positive projection of the active structure 12 on the first curved segment 1112 covers the first curved segment 1112 along the first direction Z, and the positive electrode plate 111 and the negative electrode plate 112 are wound around a first axis L parallel to the first direction Z.

[0238] By adopting the above technical solution, the active structure 12 can cover the inner side of the first curved segment 1112 as much as possible, so that the ions released from the first curved segment 1112 can be better embedded, thereby improving the problem of ion precipitation in the corner part 1102.

[0239] In some embodiments, please refer to FIG6 to FIG9 together with other drawings. Along the winding direction of the positive electrode sheet 111, the size of the active structure 12 is 10 mm to 20 mm.

[0240] As shown in Figures 6 to 9, along the winding direction of the positive electrode sheet 111, the size of the active structure 12 is the first size H1 of the active structure 12 in Figures 6 to 9 when it is in the unfolded state. The first size H1 is 10 mm to 20 mm, and specifically can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, etc.

[0241] Such a configuration enables the active structure 12 to better cover the inner side of the first curved segment 1112 along the winding direction of the positive electrode sheet 111, so that the ions released from the first curved segment 1112 can be better embedded. This can improve the problem of ion precipitation in the corner part 1102 and help improve the charge and discharge performance of the battery cell 10.

[0242] In some embodiments, referring to FIG5 and in conjunction with other drawings, the active structure 12 is in the form of a sheet, and the thickness of the active structure 12 ranges from 20 μm to 40 μm.

[0243] The active structure 12 is a sheet material, which means that the active structure 12 is a sheet-like structure. Based on this, the active structure 12, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are all sheet-like structures.

[0244] In the electrode assembly 11, the thickness directions of the positive electrode sheet 111, the thickness directions of the negative electrode sheet 112, and the thickness directions of the separator 113 are parallel. That is, the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113 are stacked along the above-mentioned thickness directions and are mutually parallel. The active structure 12 is a sheet material, so that the active structure 12 can be arranged parallel to the first curved segment 1112 and the second curved segment 1122. That is, the thickness direction of the active structure 12 is parallel to the thickness directions of the positive electrode sheet 111, the thickness direction of the negative electrode sheet 112, and the thickness direction of the separator 113.

[0245] The thickness dimension of the active structure 12 is shown as the second dimension H2 in FIG. 5 and FIG. 6 to FIG. 9 . The second dimension H2 may be 21 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 35 μm, 37 μm, 39 μm, etc.

[0246] Such a setting makes it possible to design the thickness of the active structure 12 more reasonably. On the basis of being able to efficiently embed the ions released from the first curved segment 1112, the thickness of the active structure 12 is made smaller, thereby minimizing the space occupied by the active structure 12 in the electrode assembly 11, which helps to maintain a higher energy density of the battery 100.

[0247] 2 and 3 , the battery 100 provided in the embodiment of the present application includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here.

[0248] The battery 100 provided in the embodiment of the present application, by adopting the battery cells 10 involved in the above embodiments, can improve the problem of ion precipitation of the battery cells 10, which helps to improve the charge and discharge cycle performance and reliability of the battery 100.

[0249] Referring to FIG1 , the electrical device provided in an embodiment of the present application includes a battery cell 10 or a battery 100. The battery cell 10 and battery 100 in this embodiment are identical to those in the previous embodiment. For details, please refer to the description of the battery cell 10 and battery 100 in the previous embodiment, which will not be repeated here.

[0250] The electrical device provided in the embodiment of the present application, by adopting the battery cell 10 or battery 100 involved above, helps to improve the charge and discharge cycle performance and reliability of the battery 100.

[0251] Please refer to Figure 11 and other figures. This embodiment of the application also provides a method for processing a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here. The processing method of the battery cell 10 includes the following steps:

[0252] S10, die-cutting the positive electrode sheet 111;

[0253] In this step, the incoming material of the positive electrode sheet 111 is die-cut to obtain the positive electrode sheet 111 .

[0254] S20, disposing an active structure 12 on the inner side of the first curved segment 1112 of the positive electrode sheet 111;

[0255] In this step, the active structure 12 may be provided at least on the inner side of the first curved segment 1112 to the third first curved segment 1112 of the positive electrode sheet 111 .

[0256] In this step, the active structure 12 may be bonded to the inner side of the first curved segment 1112 .

[0257] S30 , winding the positive electrode sheet 111 and the negative electrode sheet 112 .

[0258] In this step, the positive electrode sheet 111 and the negative electrode sheet 112, each provided with the active structure 12, are wound to obtain a matching structure of the electrode assembly 11 and the active structure 12. This allows the active structure 12 to be positioned between the first curved segment 1112 and the inner adjacent second curved segment 1122. This can alleviate the problem of ion precipitation at the corner portion 1102 of the electrode assembly 11.

[0259] It should be supplemented that, before step S 30 , the negative electrode sheet 112 may be die-cut, that is, the incoming material of the negative electrode sheet 112 may be die-cut to obtain the negative electrode sheet 112 .

[0260] The processing method of the battery cell 10 provided in the embodiment of the present application can set the active structure 12 on the positive electrode sheet 111 after the positive electrode sheet 111 is die-cut and before winding, so that the active structure 12 can be set between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, so as to improve the problem of ion precipitation in the corner part 1102 of the battery assembly 11.

[0261] The present embodiment also provides a method for processing a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here. The processing method of the battery cell 10 includes the following steps:

[0262] S40, die-cutting the negative electrode sheet 112;

[0263] In this step, the incoming material of the negative electrode sheet 112 is die-cut to obtain the negative electrode sheet 112 .

[0264] S50 , disposing an active structure 12 outside the second curved segment 1122 of the negative electrode sheet 112 ;

[0265] In this step, the active structure 12 may be bonded to the outer side of the second curved segment 1122 .

[0266] S60 , winding the positive electrode sheet 111 and the negative electrode sheet 112 .

[0267] In this step, the positive electrode sheet 111 and the negative electrode sheet 112, each provided with the active structure 12, are wound to obtain a matching structure of the electrode assembly 11 and the active structure 12. This allows the active structure 12 to be positioned between the first curved segment 1112 and the inner adjacent second curved segment 1122. This can alleviate the problem of ion precipitation at the corner portion 1102 of the electrode assembly 11.

[0268] It should be supplemented that, before step S60 , the positive electrode sheet 111 may be die-cut, that is, the incoming material of the positive electrode sheet 111 may be die-cut to obtain the positive electrode sheet 111 .

[0269] The processing method of the battery cell 10 provided in the embodiment of the present application can set the active structure 12 on the negative electrode sheet 112 after the negative electrode sheet 112 is die-cut and before winding, so that the active structure 12 can be set between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, so as to improve the problem of ion precipitation in the corner part 1102 of the battery assembly 11.

[0270] The present embodiment also provides a method for processing a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 in the previous embodiment, which will not be repeated here. The processing method of the battery cell 10 includes the following steps:

[0271] S70, winding the positive electrode sheet 111 and the negative electrode sheet 112, and in the process of winding the positive electrode sheet 111 and the negative electrode sheet 112, setting the active structure 12 between the inner side of the first curved segment 1112 of the positive electrode sheet 111 and the outer side of the second curved segment 1122 of the negative electrode sheet 112.

[0272] It is understood that during the winding process of the electrode assembly 11, the active structure 12 is disposed on the electrode assembly 11 so that the active structure 12 can be disposed between the first curved segment 1112 and the inner adjacent second curved segment 1122. This arrangement can improve the problem of ion precipitation at the corner portion 1102 of the battery assembly 11.

[0273] The above three processing methods of the battery cell 10 make the installation of the active structure 12 on the electrode assembly 11 simple, low-cost, and time-saving.

[0274] As one embodiment of the present application, as shown in Figures 3 to 6, a battery cell 10 includes an electrode assembly 11 and an active structure 12. The electrode assembly 11 includes a positive electrode sheet 111, a negative electrode sheet 112, and a separator 113. The positive electrode sheet 111 and the negative electrode sheet 112 are stacked and wound, and the separator 113 is disposed between the positive electrode sheet 111 and the negative electrode sheet 112. The electrode assembly 11 includes a straight portion 1101 and two corner portions 1102, which are located on opposite sides of the straight portion 1101. The positive electrode sheet 111 includes a first straight segment 1111 and a first curved segment 1112, with the first curved segment 1112 connected to the first straight segment 1111. The negative electrode sheet 112 includes a second straight segment 1121 and a second curved segment 1122, with the second curved segment 1122 connected to the second straight segment 1121. The separator 113 includes a third straight segment 1131 and a third curved segment 1132, with the third curved segment 1132 connected to the third straight segment 1131. The first straight segments 1111 and the second straight segments 1121 are alternately stacked, with the third straight segment 1131 stacked between the first straight segment 1111 and the second straight segment 1121. The first straight segments 1111, the second straight segments 1121, and the third straight segments 1131 constitute the aforementioned straight portion 1101 of the electrode assembly 11. The first curved segments 1112 and the second curved segments 1122 are alternately stacked, with the third curved segment 1132 stacked between the first curved segment 1112 and the second curved segment 1122. The first curved segments 1112, the second curved segments 1122, and the third curved segments 1132 constitute the aforementioned corner portion 1102 of the electrode assembly 11. The active structure 12 is disposed between the first curved segment 1112 and the inner adjacent diaphragm 113 and is configured to embed ions released from the first curved segment 1112 .

[0275] The active structure 12 includes a substrate 121 , an active layer 122 and an adhesive layer 123 . The active layer 122 is disposed on one side of the substrate 121 , and the adhesive layer 123 is disposed on a side of the active layer 122 away from the substrate 121 . The adhesive layer 123 is adhered to the inner side of the first curved segment 1112 .

[0276] During the charging process of the battery 100, a portion of the ions released from the positive electrode plate 111 are embedded in the negative electrode plate 112, and the other portion is embedded in the active structure 12, so that the active structure 12 consumes part of the ions, which can improve the problem of ion precipitation caused by excessive ions reaching the second curved segment 1122 of the negative electrode plate 112.

[0277] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cell (10), wherein: include: An electrode assembly (11) comprises a positive electrode sheet (111) and a negative electrode sheet (112), wherein the positive electrode sheet (111) and the negative electrode sheet (112) are stacked and wound; the electrode assembly (11) comprises a straight portion (1101) and two corner portions (1102) arranged on opposite sides of the straight portion (1101); the positive electrode sheet (111) comprises a first straight segment (1111) and a first a curved segment (1112), the negative electrode plate (112) comprising a second straight segment (1121) and a second curved segment (1122) connected to the second straight segment (1121), the first straight segment (1111) and the second straight segment (1121) are alternately stacked to form the straight portion (1101), and the first curved segment (1112) and the second curved segment (1122) are alternately stacked to form the corner portion (1102); The active structure (12) is at least partially disposed between the first curved segment (1112) and the second curved segment (1122) adjacent to the inner side, and is used for embedding ions.

2. The battery cell (10) according to claim 1, wherein: The positive electrode sheet (111) comprises more than three first curved segments (1112) spaced apart along the winding direction of the positive electrode sheet (111); along the winding direction of the positive electrode sheet (111), the active structure (12) is provided between the inner side of at least the first first curved segment (1112) to the inner side of the third first curved segment (1112) and the corresponding adjacent second curved segment (1122).

3. The battery cell (10) according to claim 1 or 2, wherein: The electrode assembly (11) further comprises a diaphragm (113), wherein the diaphragm (113) is stacked between the positive electrode sheet (111) and the negative electrode sheet (112); The active structure (12) is provided between the first curved segment (1112) and the diaphragm (113) adjacent along the inner side, and / or the active structure (12) is provided between the second curved segment (1122) and the diaphragm (113) adjacent along the outer side.

4. The battery cell (10) according to any one of claims 1 to 3, wherein: The active structure (12) comprises a substrate (121) and an active layer (122) disposed on the substrate (121) and used for embedding ions, and at least a portion of the substrate (121) and at least a portion of the active layer (122) are disposed between the first curved segment (1112) and the second curved segment (1122) adjacent to the inner side.

5. The battery cell (10) according to claim 4, wherein: The active structure (12) further comprises an adhesive layer (123), and the substrate (121) and / or the active layer (122) are provided with the adhesive layer (123); the electrode assembly (11) further comprises a diaphragm (113), and the diaphragm (113) is stacked between the positive electrode sheet (111) and the negative electrode sheet (112); At least part of the active structure (12) is arranged between the first curved segment (1112) and the diaphragm (113) adjacent along the inner side, and is bonded to the first curved segment (1112) and / or the diaphragm (113) through the adhesive layer (123); or, at least part of the active structure (12) is arranged between the second curved segment (1122) and the diaphragm (113) adjacent along the outer side, and is bonded to the second curved segment (1122) and / or the diaphragm (113) through the adhesive layer (123).

6. The battery cell (10) according to claim 5, wherein: The bonding layer (123) includes a plurality of bonding portions (1231) spaced apart on the active layer (122) or the substrate (121); the bonding portion (1231) of a single bonding layer (123) is used to bond the first curved segment (1112), the diaphragm (113) or the second curved segment (1122).

7. The battery cell (10) according to claim 6, wherein: The bonding portion (1231) is arranged on a side of the active structure (12) close to the first curved segment (1112).

8. The battery cell (10) according to any one of claims 5 to 7, wherein: The adhesive layer (123) is disposed on the active layer (122) and is bonded to the first curved segment (1112).

9. The battery cell (10) according to any one of claims 5 to 8, wherein: The adhesive layer (123) is a conductive adhesive layer and is arranged closer to the first curved segment (1112) than the active layer (122).

10. The battery cell (10) according to any one of claims 5 to 7, wherein: The adhesive layer (123) and the active layer (122) are arranged on opposite sides of the substrate (121), the adhesive layer (123) is bonded to the diaphragm (113), and the active layer (122) is in contact with the first curved segment (1112).

11. The battery cell (10) according to claim 4, wherein: The active layer (122) has adhesive properties; the electrode assembly (11) further comprises a diaphragm (113), and the diaphragm (113) is stacked between the positive electrode sheet (111) and the negative electrode sheet (112); a single active layer (122) is bonded to the first curved segment (1112), the diaphragm (113) or the second curved segment (1122).

12. The battery cell (10) according to any one of claims 4 to 11, wherein: The electrode assembly (11) further comprises a diaphragm (113), wherein the diaphragm (113) is stacked between the positive electrode sheet (111) and the negative electrode sheet (112); the substrate (121) has insulating properties and is arranged between the first curved segment (1112) and the diaphragm (113) adjacent to the inner side; the active layer (122) is arranged on a side of the substrate (121) away from the first curved segment (1112) and is electrically connected to the negative electrode sheet (112).

13. The battery cell (10) according to any one of claims 1 to 3, wherein: The electrode assembly (11) further comprises a diaphragm (113), wherein the diaphragm (113) is stacked between the positive electrode plate (111) and the negative electrode plate (112); the active structure (12) comprises an active layer (122) for embedding ions, wherein at least a portion of the active layer (122) is disposed between the first curved segment (1112) and the second curved segment (1122) adjacent to the inner side, and is disposed on the diaphragm (113).

14. The battery cell (10) according to any one of claims 4 to 13, wherein: The material of the active layer (122) includes active material, conductive agent and adhesive.

15. The battery cell (10) according to any one of claims 1 to 14, wherein: The electrode assembly (11) further comprises a diaphragm (113), wherein the diaphragm (113) is stacked between the positive electrode sheet (111) and the negative electrode sheet (112); At least a portion of the active structure (12) is disposed between the second curved segment (1122) and the separator (113) adjacent along the outer side, and is electrically connected to the negative electrode plate (112).

16. The battery cell (10) according to any one of claims 1 to 15, wherein: The active structure (12) comprises an active layer (122) for embedding ions, and at least a portion of the active layer (122) is disposed between the first curved segment (1112) and the second curved segment (1122) adjacent along the inner side; The active structure (12) further comprises a metal piece (124) provided on the active layer (122), wherein the metal piece (124) is conductively connected to the negative electrode plate (112); or, the active layer (122) is in contact and conductively connected to the second curved segment (1122).

17. The battery cell (10) according to any one of claims 1 to 16, wherein: The orthographic projection of the active structure (12) on the first curved segment (1112) covers the first curved segment (1112) along the winding direction of the positive electrode sheet (111); And / or, the positive projection of the active structure (12) on the first curved segment (1112) covers the first curved segment (1112) along a first direction (Z), and the positive electrode sheet (111) and the negative electrode sheet (112) are wound around a first axis (L) parallel to the first direction (Z).

18. The battery cell (10) according to any one of claims 1 to 17, wherein: Along the winding direction of the positive electrode sheet (111), the size of the active structure (12) is 10 mm to 20 mm.

19. The battery cell (10) according to any one of claims 1 to 18, wherein: The active structure (12) is in the form of a sheet, and has a thickness ranging from 20 μm to 40 μm.

20. A battery (100), wherein: Comprising a battery cell (10) according to any one of claims 1 to 19.

21. An electrical device, wherein: It comprises the battery cell (10) according to any one of claims 1 to 19; or, it comprises the battery (100) according to claim 20.

22. A method for processing a battery cell (10) according to any one of claims 1 to 19, wherein: include: Die-cutting the positive electrode sheet (111); An active structure (12) is arranged on the inner side of the first curved segment (1112) of the positive electrode plate (111); The positive electrode sheet (111) and the negative electrode sheet (112) are wound.

23. A method for processing a battery cell (10) according to any one of claims 1 to 19, wherein: include: Die-cutting the negative electrode sheet (112); An active structure (12) is arranged on the outer side of the second curved segment (1122) of the negative electrode plate (112); The positive electrode sheet (111) and the negative electrode sheet (112) are wound.

24. A method for processing a battery cell (10) according to any one of claims 1 to 19, wherein: include: The positive electrode sheet (111) and the negative electrode sheet (112) are wound, and in the process of winding the positive electrode sheet (111) and the negative electrode sheet (112), an active structure (12) is arranged between the inner side of a first curved segment (1112) of the positive electrode sheet (111) and the outer side of a second curved segment (1122) of the negative electrode sheet (112).

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