Battery monomer, battery, power utilization device and processing method of battery monomer

Abstract

The invention is applicable to the technical field of batteries, and provides a battery monomer, a battery, a power utilization device and a processing method of the battery monomer, the power utilization device comprises the battery, the battery comprises the battery monomer, and the battery monomer comprises an electrode assembly and an active structure. The electrode assembly comprises a positive pole piece and a negative pole piece, and the electrode assembly comprises a straight part and two corner parts respectively arranged on two opposite sides of the straight part; the positive pole piece comprises a first straight segment and a first bent segment connected with the first straight segment, the negative pole piece comprises a second straight segment and a second bent segment connected with the second straight segment, and the first straight segment and the second straight segment are alternately stacked to form a straight part; the first curved segments and the second curved segments are alternately stacked to form a corner portion. At least a portion of the active structure is disposed between the first curved segment and a second curved segment adjacent along the inner side. In this way, the active structure can embed ions removed from the first curved segment to improve the problem of ion precipitation in the corner portion.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and more specifically, relates to a battery cell, a battery, an electrical device, and a processing method for a battery cell. Background Art

[0002] In some cases, the electrode assembly is mainly formed by stacking and winding the positive electrode sheet and the negative electrode sheet, so that the electrode assembly can be divided into a straight portion and two corner portions, and the two corner portions are arranged on opposite sides of the straight portion.

[0003] For the corner part of the electrode assembly, the positive electrode sheet, the negative electrode sheet and the separator are all bent, so that the winding length of the positive electrode sheet is greater than the winding length of the negative electrode sheet located inside the positive electrode sheet, which makes the capacity ratio of the negative electrode sheet located inside the positive electrode sheet to the positive electrode sheet insufficient. In this way, during the charging process of the battery cell, the ions released from the positive electrode sheet migrate to the negative electrode sheet inside, and the negative electrode sheet inside does not have enough space to accommodate and embed these ions, which will cause the problem of ion precipitation in the corner part, affecting the charge and discharge cycle and reliability performance of the battery cell. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application 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.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including:

[0006] An electrode assembly, comprising a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are stacked and wound; the electrode assembly comprises a straight portion and two corner portions arranged on opposite sides of the straight portion; the positive electrode sheet comprises a first straight segment and a first curved segment connected to the first straight segment, the negative electrode sheet comprises a second straight segment and a second curved segment connected to the second straight segment, the first straight segment and the second straight segment are alternately stacked to form the straight portion, and the first curved segment and the second curved segment are alternately stacked to form the corner portion;

[0007] 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.

[0008] The battery cell provided in the embodiment of the present application has an active structure for embedding ions between the first curved segment of the electrode assembly and the second curved segment adjacent to the inner side, so that the ions released from the first curved segment can be embedded in the active structure in addition to the second curved segment, thereby improving the problem of excessive ions reaching the second curved segment and causing some ions to precipitate. In this way, the problem of ions being precipitated from the corner of the electrode assembly can be improved, thereby improving the charge and discharge cycle and reliability of the battery cell.

[0009] 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 an active structure is provided between the inner side of the first first curved segment to the inner side of the third first curved segment and the corresponding adjacent second curved segments.

[0010] By setting the above-mentioned active structure at the 1st to 3rd folds of the positive electrode sheet, the problem of ion precipitation in the parts of the electrode assembly where ion precipitation is serious 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 performance.

[0011] In some embodiments, the electrode assembly further includes a separator, which is stacked between the positive electrode sheet and the negative electrode sheet;

[0012] 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.

[0013] In this way, the arrangement of the active structure in the corner part is very flexible.

[0014] In some embodiments, the active structure includes a substrate and an active layer disposed on the substrate and used to insert ions, and at least a portion of the substrate and at least a portion of the active layer are disposed between a first curved segment and a second curved segment adjacent to the inner side.

[0015] The active structure is configured to include a substrate and an active layer disposed 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.

[0016] In some embodiments, the active structure further includes an adhesive layer, and the substrate and / or the active layer are provided with an adhesive layer; the electrode assembly further includes a diaphragm, and the diaphragm is stacked between the positive electrode sheet and the negative electrode sheet;

[0017] At least part of the active structure is arranged 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 through an adhesive layer, or at least part of the active structure is arranged 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 through an adhesive layer.

[0018] By providing an adhesive layer, the active structure can be stably fixed to the corner part, which can improve the problem of the active structure falling off, and further improve the problem of ion precipitation in the corner part. In addition, the active structure is bonded to the corner part through the adhesive layer, making the fixing process of the active structure on the corner part very simple and easy to implement.

[0019] 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.

[0020] Such an arrangement enables 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.

[0021] In some embodiments, the bonding portion is disposed on a side of the active structure close to the first curved segment.

[0022] Such an arrangement enables 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.

[0023] In some embodiments, the bonding layer is disposed on the active layer and bonded to the first curved segment.

[0024] Such arrangement enables the active layer to be as close as possible to the inner side of the first curved segment, thereby improving the efficiency of ions released from the first curved segment to be embedded in the active layer, effectively improving the problem of ion precipitation at the corner. In addition, the active structure is bonded to the first curved segment, facilitating the ions released from the first curved segment to be embedded in the active layer, effectively improving the problem of ion precipitation at the corner.

[0025] In some embodiments, the bonding layer is a conductive adhesive layer and is disposed closer to the first bending segment than the active layer.

[0026] Such an arrangement enables the ions released from the first curved segment to be quickly embedded in the active layer in 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.

[0027] 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.

[0028] With such an arrangement, while the active structure can be bonded to the corner portion, 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, thereby improving the efficiency of the ions released from the first curved segment to be embedded in the active structure, and facilitating the improvement of the problem of ion precipitation in the corner portion.

[0029] In some embodiments, the active layer has adhesive properties; the electrode assembly also includes a separator, 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 separator or the second curved segment.

[0030] With this arrangement, no additional bonding layer is required, making the structure of the active structure very simple. In addition, the ions released from the first curved segment can be quickly embedded in the active layer.

[0031] In some embodiments, the electrode assembly also includes a diaphragm, which is stacked between the positive electrode plate and the negative electrode plate; the substrate has insulating properties and is arranged between the first curved segment and the diaphragm adjacent to the inner side, and the active layer is arranged on the side of the substrate away from the first curved segment and is conductive to the negative electrode plate.

[0032] Such a configuration allows the active structure to embed ions during battery charging and release ions during battery discharging. This not only improves the problem of ion precipitation, but also improves the utilization rate of ions in the battery, thereby increasing the battery's charge and discharge capacity.

[0033] In some embodiments, the electrode assembly also 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 to the inner side, and is disposed on the diaphragm.

[0034] By directly setting the active layer on the diaphragm, the active structure does not need to have a substrate, which can reduce the volume and mass of the active structure, thereby helping to improve the energy density of the battery.

[0035] In some embodiments, the material of the active layer includes an active material, a conductive agent, and a binder.

[0036] Such a configuration enables the active layer to have the ability to embed ions, thereby enabling the ions to be embedded to improve the problem of ion precipitation at the corners, and also facilitates the formation of the active layer on the substrate or the diaphragm.

[0037] In some embodiments, the electrode assembly further includes a separator, which is stacked between the positive electrode sheet and the negative electrode sheet;

[0038] At least part 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.

[0039] 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.

[0040] In some embodiments, the active structure includes an active layer for intercalating ions, at least a portion of the active layer being disposed between a first curved segment and a second curved segment adjacent along an inner side;

[0041] The active structure also includes a metal piece arranged 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.

[0042] The metal part is connected to the negative electrode plate, 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 plate, expand the potential difference between the positive electrode plate and the active structure, increase the reaction rate of ions and the active structure, and improve the efficiency of ions released from the first curved segment to embed into the active structure.

[0043] 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;

[0044] And / or, the orthographic projection of the active structure on the first curved segment covers the first curved segment along a first direction, and the positive electrode sheet and the negative electrode sheet are wound around a first axis parallel to the first direction.

[0045] 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 escaped from the first curved segment can be better embedded, thus improving the problem of ion precipitation in the corner part.

[0046] In some embodiments, along the winding direction of the positive electrode sheet, the size of the active structure is 10 mm to 20 mm.

[0047] 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.

[0048] In some embodiments, the active structure is in the form of a sheet with a thickness ranging from 20 μm to 40 μm.

[0049] Such an arrangement allows the thickness of the active structure to be designed more reasonably. On the basis of being able to efficiently embed the ions escaped from the first curved segment, the thickness of the active structure is reduced, thereby minimizing the space occupied by the active structure in the electrode assembly, which helps maintain a higher energy density of the battery.

[0050] In a second aspect, an embodiment of the present application provides a battery, including a battery cell.

[0051] The battery provided in the embodiment of the present application can improve the problem of ion precipitation of the battery cell by adopting the battery cell involved in the above embodiments, which helps to improve the charge and discharge cycle performance and reliability of the battery.

[0052] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0053] 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.

[0054] In a fourth aspect, an embodiment of the present application provides a method for processing a battery cell, comprising:

[0055] Die-cutting the positive electrode sheet;

[0056] An active structure is disposed on the inner side of the first curved segment of the positive electrode plate;

[0057] The positive electrode sheet and the negative electrode sheet are wound.

[0058] 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 part of the battery cell, and help to improve the charge and discharge cycle performance and reliability performance of the battery cell.

[0059] In a fifth aspect, an embodiment of the present application provides a method for processing a battery cell, comprising:

[0060] Die-cutting the negative electrode sheet;

[0061] An active structure is disposed outside the second curved segment of the negative electrode plate;

[0062] The positive electrode sheet and the negative electrode sheet are wound.

[0063] 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 part of the battery cell, and help to improve the charge and discharge cycle performance and reliability performance of the battery cell.

[0064] In a sixth aspect, an embodiment of the present application provides a method for processing a battery cell, comprising:

[0065] The positive electrode sheet and the negative electrode sheet are wound, and in the process of winding the positive electrode sheet and the negative electrode sheet, 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.

[0066] 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 part of the battery cell, and help to improve the charge and discharge cycle performance and reliability performance of the battery cell.

[0067] 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

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0069] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0070] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0071] Figure 3 An exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0072] Figure 4 A cross-sectional view of the electrode assembly and active structure of a battery cell provided in some embodiments of the present application;

[0073] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0074] Figure 6 An expanded cross-sectional view of an active structure of a battery cell provided in some embodiments of the present application;

[0075] Figure 7 An expanded cross-sectional view of an active structure of a battery cell provided in some other embodiments of the present application;

[0076] Figure 8 An expanded cross-sectional view of an active structure of a battery cell provided in some other embodiments of the present application;

[0077] Fig. 9 An expanded cross-sectional view of an active structure of a battery cell provided in some further embodiments of the present application;

[0078] Fig.10 A partial cross-sectional view of a corner portion and an active structure of a battery cell provided in some embodiments of the present application;

[0079] Fig.11 A flow chart of a method for processing a battery cell provided in some embodiments of the present application.

[0080] Among them, the reference numerals in the figure are:

[0081] 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 ear; 112-negative electrode plate; 1121-second straight segment; 1122-first curved segment Two curved segments; 1123-negative electrode ear; 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

[0082] Embodiments of the present application are described in detail below, and examples of the embodiments 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.

[0083] In the description of the present 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 drawings, and are only for the convenience of describing the present 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 should not be understood as a limitation on the present application.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0085] In the description of the present application, "plurality" means more than two, and unless otherwise clearly and specifically defined, "more than two" includes two. Accordingly, "multiple groups" means more than two groups, including two groups.

[0086] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0087] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0088] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned 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 includes all technical solutions falling within the scope of the claims.

[0089] In the related art, a battery cell includes an electrode assembly, which is a component in the battery cell where electrochemical reactions occur. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator.

[0090] For the wound electrode assembly, the positive electrode sheet and the negative electrode sheet are stacked and wound. The separator is arranged between the positive electrode sheet and the negative electrode sheet to achieve insulation between the positive electrode sheet and the negative electrode sheet.

[0091] In some cases, the electrode assembly can be divided into a straight portion and two corner portions, and the two corner portions are respectively arranged on opposite sides of the straight portion. Specifically, the positive electrode sheet, the negative electrode sheet and the separator all have a straight segment and a curved segment connected to the straight segment, and the straight segment of the positive electrode sheet, the straight segment of the negative electrode sheet and the straight segment of the separator are arranged straight and stacked to form the above-mentioned straight portion of the electrode assembly; the curved segment of the positive electrode sheet, the curved segment of the negative electrode sheet and the curved segment of the separator are arranged curved and stacked to form the above-mentioned corner portion of the electrode assembly.

[0092] During the charging process of a battery cell, the positive electrode sheet releases ions, which migrate to the negative electrode sheet and are embedded in the negative electrode sheet. Taking lithium-ion batteries as an example, during the charging process of a battery cell, lithium ions release from the positive electrode sheet and migrate to the negative electrode sheet to be embedded in the negative electrode sheet.

[0093] 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. That is, lithium ions will reach the negative electrode sheet inside in excess, causing lithium deposition from the negative electrode sheet inside. Therefore, there is a problem of lithium deposition in the corner portion, which affects the charge and discharge cycle and reliability performance of the battery cell.

[0094] 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, wherein an active structure for embedding ions is provided between a first curved segment and a second curved segment adjacent to the inner side, so that ions released from the first curved segment can be embedded in the active structure in addition to the second curved segment, thereby improving the problem of excessive ions reaching the second curved segment and causing partial ion precipitation. In this way, the problem of ion precipitation at the corner of the electrode assembly can be improved, thereby improving the charge and discharge cycle and reliability of the battery cell.

[0095] In some embodiments, the battery cell involved in the embodiments of the present application can be used in an electrical device that uses a battery cell or a battery as a power source. The battery involved in the embodiments of the present application can be used in an electrical device that uses a battery as a power source.

[0096] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.

[0097] The battery involved in the embodiment of the present application can be a single physical module including 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, in parallel or in hybrid connection through a busbar component. Hybrid connection means that multiple battery cells are connected in both series and in parallel.

[0098] 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. As an example, the multiple battery cells may be fixed to form a battery module by rolling strips, etc. As an example, the multiple battery cells may also be fixed to form a battery module by end plates, side plates, etc.

[0099] In some embodiments, the battery may be a battery pack, which may include a box and a battery cell. As an example, the battery cell may be directly accommodated in the box. As an example, the battery cell may also be formed into a battery module first and then accommodated in the box.

[0100] For ease of description, the embodiments of the present application are described using the electrical device being a vehicle as an example.

[0101] See also Figure 1 , Figure 1 Schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The above-mentioned battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed 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 be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0102] In some embodiments, the battery 100 can be used 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.

[0103] See also Figure 2 , Figure 2An exploded view of a battery 100 provided for 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 having a storage space inside, and the housing 20 may adopt a variety of structures. In some embodiments, the housing 20 may include a first portion 21 and a second portion 22, which cover each other and jointly define the above-mentioned storage space. The first portion 21 may be a hollow structure having an opening at one end, and the second portion 22 is a plate-like structure, and 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 above-mentioned storage space; or, the first portion 21 and the second portion 22 may both be hollow structures having an opening at one end, such as Figure 2 As shown, the opening side of the first part 21 covers the opening side of the second part 22, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space. Among them, the box body 20 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0104] In some embodiments, a plurality of battery cells 10 may be connected in series, in parallel or in mixed connection to form a whole, and then the whole formed by the plurality of battery cells 10 may be directly accommodated in the above-mentioned accommodation space of the box body 20, such as Figure 2 Multiple battery cells 10 can also be connected in series, in parallel or in mixed connection, and arranged and fixed to form multiple battery modules, and then multiple battery modules are connected in series, in parallel or in mixed connection to form a whole, and accommodated in the above-mentioned accommodation space of the box body 20.

[0105] In some embodiments, please combine Figure 1 and Figure 2 When the battery 100 is applied to a vehicle, the box 20 of the battery 100 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 20 can become at least a part of the chassis of the vehicle 1000, or part of the box 20 can become at least a part of the cross beam and the longitudinal beam of the vehicle 1000.

[0106] The battery cell 10 refers to the smallest unit for storing and outputting electric energy. The battery cell 10 may be a secondary battery or a primary battery. The battery cell 10 may 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 may be cylindrical, flat, rectangular, or in other shapes.

[0107] Please also read Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of an exploded view of a battery cell 10 provided in some embodiments of the present application. Figure 4 A cross-sectional view of the electrode assembly 11 and the active structure 12 provided in some embodiments of the present application. Figure 4The cross section shown is Figure 3 The Z axis in the figure is vertical. The battery cell 10 includes an electrode assembly 11 and a housing 13 .

[0108] The electrode assembly 11 is a component in the battery cell 10 where an electrochemical reaction occurs. The electrode assembly 11 is mainly formed by winding a positive electrode sheet 111 and a negative electrode sheet 112, and a separator 113 is provided between the positive electrode sheet 111 and the negative electrode sheet 112. A portion of the positive electrode sheet 111 has an active material, a portion of the negative electrode sheet 112 has an active material, and a portion of the positive electrode sheet 111 without an active material and a portion of the negative electrode sheet 112 without an active material each constitute a tab. The tab of the positive electrode sheet 111 is a positive tab 1113, and the tab of the negative electrode sheet 112 is a 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.

[0109] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0110] In some embodiments, the battery cell 10 may further include an electrolyte, which plays a role in conducting 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. Among them, during the charging process of the battery cell 10, the active material of the positive electrode sheet 111 releases ions, and the ions migrate to the negative electrode sheet 112 and embed into 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 to the positive electrode sheet 111 to embed into the active material of the positive electrode sheet 111.

[0111] The outer shell 13 includes a shell 131 and an end cap 132. The shell 131 and the end cap 132 are components used to jointly define 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 to 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 packaged after the electrode assembly 11 is placed in the shell, the end cap 132 covers the shell 131.

[0112] The number of the end cap 132 may be one. The number of the end cap 132 may also be two, and the two end caps 132 are respectively disposed at two opposite ends of the housing 131 .

[0113] The shell 131 may be cylindrical, square, or other shapes, which may be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell 131 and the end cap 132 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0114] 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.

[0115] Please also read Figures 3 to 5 , Figure 4 A cross-sectional view of the electrode assembly 11 and the active structure 12 provided in some embodiments of the present application. Figure 4 The cross section shown is perpendicular to the Z axis (that is, the first direction Z). Figure 5 for Figure 4 Enlarged view of point A in the middle. The battery cell 10 provided in the 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, and 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, and the two corner portions 1102 are arranged 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, and the first curved segment 1112 is connected to the first straight segment 1111. The negative electrode sheet 112 includes a second straight segment 1121 and a second curved segment 1122, and the second curved segment 1122 is 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 of the electrode assembly 11, and the first curved segment 1112 and the second curved segment 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 along the inner side, and is used to embed ions.

[0116] It can be understood that the positive electrode sheet 111 and the negative electrode sheet 112 are stacked and arranged, and the positive electrode sheet 111 and the negative electrode sheet 112 are stacked and arranged as a whole to form a wound arrangement to constitute the electrode assembly 11 .

[0117] like Figure 3 and Figure 4 As shown, 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.

[0118] like Figure 3 and Figure 4 As shown, the electrode assembly 11 can be divided into a straight portion 1101 and two corner portions 1102, and the two corner portions 1102 are arranged on opposite sides of the straight portion 1101. Figure 4 The electrode assembly 11 is divided into a straight portion 1101 and a corner portion 1102 by dotted lines.

[0119] After the positive electrode sheet 111 and the negative electrode sheet 112 are stacked and wound to form the electrode assembly 11, Figure 4 As shown, a portion of the positive electrode sheet 111 is in a straight distribution state, which is a first straight segment 1111; another portion of the positive electrode sheet 111 is in a curved distribution state, which is a first curved segment 1112. A portion of the negative electrode sheet 112 is in a straight distribution state, which is a second straight segment 1121; another portion of the negative electrode sheet 112 is in a curved distribution state, which is a second curved segment 1122.

[0120] like Figure 4 and Figure 5 As shown, 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, each first straight segment 1111 and each first curved segment 1112 are alternately distributed and connected, so that a plurality of first straight segments 1111 and a 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, each second straight segment 1121 and each second curved segment 1122 are alternately distributed and connected, so that a plurality of second straight segments 1121 and second curved segments 1122 are connected to form the negative electrode sheet 112.

[0121] The winding direction of the positive electrode sheet 111 refers to the direction in which the positive electrode sheet 111 is wound from the head end to the tail end of the positive electrode sheet 111, and the head end of the positive electrode sheet 111 is closer to the center of the electrode assembly 11 than the tail 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 head end to the tail end of the negative electrode sheet 112, and the head end of the negative electrode sheet 112 is closer to the center of the electrode assembly 11 than the tail end.

[0122] like Figures 3 to 5As shown, 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, each first straight segment 1111 and each second straight segment 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 extension state. Specifically, the positive electrode sheet 111 located in the straight portion 1101 is the first straight segment 1111, and the negative electrode sheet 112 located in the straight portion 1101 is the second straight segment 1121, that is, the positive electrode sheet 111 and the negative electrode sheet 112 located in the straight portion 1101 are both distributed in a straight state.

[0123] 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, each first curved segment 1112 and each second curved segment 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.

[0124] 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. Figures 3 to 5 As shown, 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, the Y axis and the Z axis constitute Figure 3 The X-axis, Y-axis and Z-axis are three coordinate axes that are perpendicular to each other in the spatial coordinate system. Figure 4 and Figure 5 plane coordinate system.

[0125] 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 parts of the positive electrode plate 111 having active materials, and the part 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, and can also be conductively connected to the first curved segment 1112.

[0126] 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 parts of the negative electrode plate 112 having active materials, and the part of the negative electrode plate 112 not having active materials constitutes the negative electrode tab 1123. The negative electrode tab 1123 can be conductively connected to the second straight segment 1121, and can also be conductively connected to the second curved segment 1122.

[0127] The active structure 12 is a component having active materials and capable of embedding ions. The active structure 12 is arranged at the corner portion 1102 of the electrode assembly 11 to embed ions at the corner portion 1102 , thereby improving the problem of ion precipitation at the corner portion 1102 .

[0128] At least part of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, which means that at least part of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 located on the inner side of the first curved segment 1112 and adjacent to the first curved segment 1112. It should be noted that in the corner portion 1102, each first curved segment 1112 and each second curved segment 1122 are alternately arranged. In this way, in the first curved segment 1112 and the second curved segment 1122 adjacent along the third direction Y, there may be a situation where the first curved segment 1112 is located on the outer side of the second curved segment 1122, that is, the second curved segment 1122 is located on the inner side of the first curved segment 1112, and the active structure 12 is disposed between the inner side of the first curved segment 1112 and the outer side of the second curved segment 1122.

[0129] The second curved segment 1122 adjacent along the inner side refers to the second curved segment 1122 located on the inner side of the first curved segment 1112 and adjacent to the first curved segment 1112 along the third direction Y. The inner 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 outer 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.

[0130] 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 escaped from the first curved segment 1112 .

[0131] The electrode assembly 11 provided in the embodiment of the present application is provided with an active structure 12 for embedding ions between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side, so that during the charging process of the battery 100 monomer, the ions released from the first curved segment 1112 can be embedded in the second curved segment 1122 as well as the active structure 12, which can improve the problem of excessive ions reaching the second curved segment 1122 and causing some ions to precipitate. In this way, the problem of ion precipitation in the corner portion 1102 of the electrode assembly 11 can be improved, and the charge and discharge cycle performance and reliability of the battery 100 can be improved.

[0132] Based on the above structure, during the charging process of the battery 100, the positive electrode sheet 111 releases ions, and the ions migrate to the negative electrode sheet 112 and are embedded in the negative electrode sheet 112. Specifically, the ions released from the first straight segment 1111 can be embedded in the second straight segment 1121, and the ions released from the first curved segment 1112 can be partially embedded in the active structure 12 and the other part embedded in the second curved segment 1122.

[0133] In addition, by providing an active structure 12 at the corner portion 1102 so that the active structure 12 fills 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 transport 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.

[0134] In some cases, active substances of different material ratios can be coated on the first straight segment 1111 and the first curved segment 1112 of the positive electrode plate 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 plate 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 plate 111, an intermittent coating method be used to coat the positive electrode plate 111 with active substances of different material ratios to make a special positive electrode plate 111, which increases the process difficulty. 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 setting an active structure 12 between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side, which can reduce the process difficulty and facilitate production.

[0135] In some embodiments, see Figure 4, and in combination with other drawings. The positive electrode sheet 111 includes more than three first curved segments 1112, and the more than three first curved segments 1112 are sequentially spaced and distributed along the winding direction of the positive electrode sheet 111. Along the winding direction of the positive electrode sheet 111, at least the first first curved segment 1112 to the third first curved segment 1112 are provided with an active structure 12 between the second curved segment 1122 adjacent to the inner side.

[0136] Among them, 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, and may also include four, five, six, or more than three first curved segments 1112.

[0137] 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 inner side, an active structure 12 is also provided between the second first curved segment 1112 and the second curved segment 1122 adjacent to the inner side, and an active structure 12 is also provided between the third first curved segment 1112 and the second curved segment 1122 adjacent to the inner side. Based on this, the active structure 12 inside the first first curved segment 1112 can improve the problem of ion precipitation at the first first curved segment 1112, the active structure 12 inside 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 inside 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, the active structures 12 are arranged at the first to third folds of the positive electrode sheet 111, so as 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.

[0138] It should be noted that during the charging process of the battery 100, the ions at the first to fifth folds of the positive electrode sheet 111 tend to excessively reach the negative electrode sheet 112, resulting in ion precipitation. In particular, the ions at the first to third folds of the positive electrode sheet 111 tend to precipitate more easily.

[0139] By providing the above-mentioned active structure 12 at the 1st to 3rd folds of the positive electrode sheet 111, the problem of ion precipitation in the parts of the electrode assembly 11 where ion precipitation is serious 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.

[0140] In some embodiments, an active structure 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 .

[0141] In some embodiments, please refer to Figure 4 and Figure 5 , and in combination with other drawings. The electrode assembly 11 further includes a separator 113 , and the separator 113 is stacked between the positive electrode sheet 111 and the negative electrode sheet 112 .

[0142] 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 having an internal short circuit as much as possible.

[0143] like Figure 4 and Figure 5 As shown, 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. Part of the separator 113 is arranged in a straight state, and is 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, thereby forming the straight portion 1101 of the electrode assembly 11 together with the first straight segment 1111 and the second straight segment 1121. Another part of the separator 113 is arranged in a curved state, and is 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, thereby forming the corner portion 1102 of the electrode assembly 11 together with the first curved segment 1112 and the second curved segment 1122.

[0144] like Figure 4 and Figure 5 As shown, the separator 113 includes a plurality of third straight segments 1131 and a plurality of third bent segments. Along the winding direction of the separator 113, each third straight segment 1131 and each third bent segment 1132 are alternately distributed and connected, so that a plurality of third straight segments 1131 and a plurality of third bent 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 head end to the tail end of the separator 113, and the head end of the separator 113 is closer to the center position of the electrode assembly 11 than the tail end.

[0145] like Figure 4 and Figure 5As shown, the diaphragm 113 located at the straight portion 1101 is a third straight segment 1131, which is disposed between the first straight segment 1111 and the second straight segment 1121 along the second direction X to form the straight portion 1101 with the first straight segment 1111 and the second straight segment 1121, so that the straight portion 1101 of the electrode assembly 11 is in a straight extension state. The diaphragm 113 located at the corner portion 1102 is a third curved segment 1132, which is disposed between the first curved segment 1112 and the second curved segment 1122 to form the corner portion 1102 with the first curved segment 1112 and the second curved segment 1122, so that the corner portion 1102 of the electrode assembly 11 is in a curved extension state.

[0146] The third straight segment 1131 is located between the first straight segment 1111 and the second straight segment 1121 to achieve 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 achieve insulation between the first curved segment 1112 and the second curved segment 1122. In this way, the separator 113 achieves insulation between the positive electrode sheet 111 and the negative electrode sheet 112.

[0147] In some embodiments, please refer to Figure 4 and Figure 5 , and in combination with other drawings. An active structure 12 is provided between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side. Alternatively, an active structure 12 is provided between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side. Alternatively, an active structure 12 is provided between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, and an active structure 12 is provided between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side.

[0148] It can be understood that at least part 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 part 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 part of the active structure 12 is disposed between the first curved segment 1112 and the diaphragm 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 diaphragm 113 located on the inner side of the first curved segment 1112 and adjacent to the first curved segment 1112; or, at least part of the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side, that is, at least part of the active structure 12 is disposed on the outer side of the second bend and between the diaphragm 113 located on the outer side of the second curved segment 1122 and adjacent to the second curved segment 1122.

[0149] Based on this, when there is only one active structure 12, at least part of the active structure 12 can be arranged between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, or between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side. When there are multiple active structures 12, the multiple active structures 12 can all be arranged between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side; or all can be arranged between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side; or at least one active structure 12 can be arranged between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, and at least one active structure 12 can be arranged between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side.

[0150] By arranging at least part of the active structure 12 between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, or arranging at least part of the active structure 12 between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side, the active structure 12 can be located inside the first curved segment 1112, so that the ions released from the first curved segment 1112 can be embedded in the active structure 12 inside, so as to improve the problem of ion precipitation at the corner portion 1102. In this way, the arrangement of the active structure 12 at the corner portion 1102 is very flexible.

[0151] In some embodiments, please refer to Figure 5 and Figure 6 , and combined with other drawings. Among them, Figure 6 Schematic diagram of an expanded cross-section of an active structure 12 of a battery cell 10 provided in some embodiments of the present application, Figure 6The cross section shown is perpendicular to the Z axis (that is, the first direction Z). That is, Figure 6 for Figure 4 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 arranged 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. Figures 6 to 9 The active structures 12 shown are all in a straight state, that is, in an unfolded state. The active structures 12 include 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 disposed between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side.

[0152] 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 .

[0153] The active layer 122 refers to a portion of the active structure 12 having active materials, and the active layer 122 can be used to embed ions.

[0154] 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 diaphragm 113 adjacent to the inner side, the substrate 121 and the active layer 122 are both disposed between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side. When the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, the substrate 121 and the active layer 122 are both disposed between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side.

[0155] Based on the above structure, during the charging process of the battery 100, 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 ion precipitation caused by excessive ions reaching the second curved segment 1122.

[0156] The active structure 12 is configured to include a substrate 121 and an active layer 122 disposed 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 .

[0157] 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.

[0158] For example, the substrate 121 may be made of, but is not limited to, biaxially oriented polypropylene film, polyethylene, polypropylene, polyimide, polyethylene terephthalate, and the like.

[0159] In some embodiments, Figure 5 and Figure 6 As shown, the active layer 122 and the substrate 121 are sequentially arranged along the thickness direction of the substrate 121. Moreover, when the active structure 12 is arranged at the corner portion 1102, the active layer 122 can be arranged parallel to the first curved segment 1112, so that the active layer 122 can be efficiently embedded with ions to improve the problem of ion precipitation.

[0160] In some embodiments, please refer to Figures 5 to 7 , and combined with other drawings. Among them, Figure 7 The following are expanded cross-sectional views of the active structure 12 of the battery cell 10 provided in some other embodiments of the present application. Figure 7 The cross section shown is perpendicular to the Z axis (that is, the first direction Z). That is, Figure 7 for Figure 4 The active structure 12 of the structure shown is in a schematic diagram in an unfolded state. The active structure 12 also includes an adhesive layer 123. In some possible designs, such as Figure 6 As shown, the active layer 122 is provided with an adhesive layer 123; or, in some possible designs, such as Figure 7 As shown, 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 .

[0161] The electrode assembly 11 further includes a separator 113 , which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112 .

[0162] At least part of the active structure 12 may be disposed between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, or at least part of the active structure 12 may also be disposed between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side.

[0163] When at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the diaphragm 113 adjacent to 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, adhesive layers 123 are provided on opposite sides of the active structure 12, and are respectively bonded to the first curved segment 1112 and the diaphragm 113 through the adhesive layers 123 on the opposite sides.

[0164] When at least a portion of the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, an adhesive layer 123 is provided on one side of the active structure 12, and is bonded to the second curved segment 1122 through the adhesive layer 123; or, an adhesive layer 123 is provided on the other side of the active structure 12, and is bonded to the diaphragm 113 through the adhesive layer 123; or, adhesive layers 123 are provided on two 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.

[0165] The adhesive layer 123 is a component with adhesive properties on the active structure 12. For example, it can be double-sided adhesive, structural adhesive, etc.

[0166] Wherein, when the active layer 122 is provided with an adhesive layer 123, as Figure 6 As shown, the adhesive layer 123 is disposed on the side of the active layer 122 away from the substrate 121. When the substrate 121 is provided with the adhesive layer 123, as shown in FIG. Figure 7 As shown, the adhesive layer 123 is disposed on a side of the substrate 121 away from the active layer 122 .

[0167] It should be noted that when at least part of the active structure 12 is disposed between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, in some possible designs, the active structure 12 is bonded to the first curved segment 1112 through the adhesive layer 123, specifically, the adhesive layer 123 is bonded to the inner side of the first curved segment 1112. 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 active layer 122 away from the substrate 121; 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 substrate 121 away from the active layer 122. In other possible designs, the active structure 12 is bonded to the diaphragm 113 through 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 arranged on the side of the substrate 121 facing the first curved segment 1112, the adhesive layer 123 is arranged on the side of the substrate 121 away from the active layer 122; when the active layer 122 is arranged on the side of the substrate 121 away from the first curved segment 1112, the adhesive layer 123 is arranged on the side of the active layer 122 away from the substrate 121. In some other possible designs, the active structure 12 is bonded to the first curved segment 1112 and the diaphragm 113 through the adhesive layer 123. Specifically, 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 are both provided with adhesive layers 123, that is, there are two adhesive layers 123. One of the adhesive layers 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.

[0168] When at least part of the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent along the outside, in some possible designs, the active structure 12 is bonded to the second curved segment 1122 through the adhesive layer 123, specifically, the adhesive layer 123 is bonded to the outside of the second curved segment 1122. 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 active layer 122 away from the substrate 121; 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 substrate 121 away from the active layer 122. In other possible designs, the active structure 12 is bonded to the diaphragm 113 through the adhesive layer 123, specifically, the adhesive layer 123 is bonded to the inside of the diaphragm 113. Based on this, when the active layer 122 is arranged on the side of the substrate 121 facing the second curved segment 1122, the adhesive layer 123 is arranged on the side of the substrate 121 away from the active layer 122; when the active layer 122 is arranged on the side of the substrate 121 away from the second curved segment 1122, the adhesive layer 123 is arranged on the side of the active layer 122 away from the substrate 121. In some other possible designs, the active structure 12 is bonded to the second curved segment 1122 and the diaphragm 113 through the adhesive layer 123. Specifically, 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 are both provided with adhesive layers 123, that is, there are two adhesive layers 123. One of the adhesive layers 123 is bonded to the outer side of the second curved segment 1122, and the other adhesive layer 123 is bonded to the inner side of the diaphragm 113.

[0169] By providing the adhesive layer 123, the active structure 12 can be stably fixed to the corner portion 1102, which can improve the problem of the active structure 12 falling off, and further improve the problem of ion precipitation in the corner portion 1102. In addition, the active structure 12 is bonded to the corner portion 1102 through the adhesive layer 123, so that the fixing process of the active structure 12 on the corner portion 1102 is very simple and easy to implement.

[0170] In some embodiments, please refer to Figure 5 , Figure 6 and Figure 8 , and combined with other drawings. Among them, Figure 8 The expanded cross-sectional view is of the active structure 12 of the electrode assembly 11 provided in some other embodiments of the present application.

[0171] Figure 8 The cross section shown is perpendicular to the Z axis (that is, the first direction Z). That is, Figure 8 for Figure 4The schematic diagram of the active structure 12 of the structure shown is in the unfolded 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 portions 1231 of the single bonding layer 123 are used to bond the first curved segment 1112, the diaphragm 113 or the second curved segment 1122.

[0172] The adhesive portion 1231 is a portion of the adhesive layer 123 , and each adhesive portion 1231 is used to perform an adhesive function.

[0173] It is understandable that a single adhesive layer 123 may be bonded to the first curved segment 1112 , the diaphragm 113 , or the second curved segment 1122 .

[0174] like Figure 8 As shown, 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.

[0175] 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.

[0176] By dividing the adhesive layer 123 into a plurality of adhesive portions 1231 , the amount of the adhesive layer 123 used can be reduced, thereby helping to improve the energy density of the battery 100 .

[0177] In some embodiments, the bonding portion 1231 is disposed on a side of the active structure 12 close to the first curved segment 1112 .

[0178] 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 bonding portion 1231 is disposed on the side of the active layer 122 away from the substrate 121. When the active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112, the bonding portion 1231 is disposed on the side of the substrate 121 away from the active layer 122. Based on this, the bonding portion 1231 can be disposed on the side of the active structure 12 close to the first curved segment 1112. When at least part of the active structure 12 is disposed between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, the active structure 12 is bonded to the inner side of the first curved segment 1112 through the bonding portion 1231; when the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent along the outer side, the active structure 12 is bonded to the inner side of the diaphragm 113 through the bonding portion 1231.

[0179] By arranging multiple adhesive portions 1231 in an intervally distributed manner, when the active structure 12 is arranged between the first curved segment 1112 and the diaphragm 113 adjacent to 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 diaphragm 113 adjacent to the outside, 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, thereby increasing the contact area between the inner side of the diaphragm 113 and the substrate 121, or increasing the contact area between the inner side of the diaphragm 113 and the active layer 122, on the basis of maintaining a good bonding effect between the active structure 12 and the diaphragm 113. In this way, the ions released from the first curved segment 1112 can be embedded in the active structure 12 more quickly, thereby better improving the problem that the ions released from the first curved segment 1112 excessively reach the second curved segment 1122, and further improving the problem of ion precipitation in the corner portion 1102.

[0180] In some embodiments, please refer to Figure 5 and Figure 6 , and in combination with other drawings. The adhesive layer 123 is disposed on the active layer 122 and is bonded to the first curved segment 1112 .

[0181] like Figure 6 As shown, combined with Figure 5 The active structure 12 is disposed between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side. In addition, 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 away from the substrate 121, and the adhesive layer 123 is bonded to the inner side of the first curved segment 1112.

[0182] Such arrangement enables the active layer 122 to be as close to the inner side of the first curved segment 1112 as possible, thereby improving the efficiency of the ions released from the first curved segment 1112 to be embedded in the active layer 122, so as to effectively improve the problem of ion precipitation at the corner portion 1102. In addition, the active structure 12 is bonded to the first curved segment 1112, so as to facilitate the ions released from the first curved segment 1112 to be embedded in the active layer 122, so as to effectively improve the problem of ion precipitation at the corner portion 1102.

[0183] For additional information, please refer to Figure 5 , Figure 6 and Figure 8 When the bonding layer 123 includes a plurality of bonding portions 1231, the plurality of bonding portions 1231 are spaced apart and distributed 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. In this way, the area of ​​the active layer 122 directly contacting the inner side of the first curved segment 1112 can be increased, so that the ions released from the first curved segment 1112 can be directly embedded in the active layer 122, so as to improve the efficiency of ion embedding in the active structure 12, and further effectively improve the problem of ion precipitation in the corner portion 1102.

[0184] In some embodiments, please refer to Figures 5 to 8 , and in combination 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 .

[0185] The conductive adhesive layer refers to an adhesive layer made of conductive adhesive, and the conductive adhesive layer has conductive properties.

[0186] 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 away from the substrate 121. In other possible designs, the active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112, and the adhesive layer 123 is disposed on the side of the substrate 121 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 diaphragm 113 adjacent along the inner side, the adhesive layer 123 is bonded 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 diaphragm 113 adjacent along the outer side, the adhesive layer 123 is bonded to the inner side of the diaphragm 113.

[0187] In this way, the adhesive layer 123 is arranged closer to the first curved segment 1112 than the active layer 122, so that the ions released from the first curved segment 1112 can be embedded in the active layer 122 only after passing through the adhesive layer 123. Since the adhesive layer 123 is a conductive adhesive layer, the active structure 12 can be stably bonded to the corner portion 1102, and the ions released from the first curved segment 1112 can be quickly embedded in the active layer 122 in the conductive environment of the adhesive layer 123, that is, the efficiency of the reaction between the ions and the active layer 122 can be improved, and the problem of ion precipitation in the corner portion 1102 can be effectively improved.

[0188] In some embodiments, the material of the bonding layer 123 may include an adhesive and conductive particles, the adhesive includes at least one of acrylic acid and polyester materials, and the conductive particles include at least one of gold, silver, copper, aluminum, nickel, gold oxide, silver oxide, copper oxide, aluminum oxide, nickel oxide, graphene and graphite. In this way, the bonding layer 123 has good bonding properties, so that the active structure 12 can be stably bonded to the corner portion 1102. In addition, the bonding layer 123 also has a conductive ability, so that the efficiency of the ions released from the first curved segment 1112 to be embedded in the active structure 12 can be improved, so as to improve the problem of ion precipitation in the corner portion 1102.

[0189] 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 .

[0190] The active layer 122 is disposed on a side of the substrate 121 facing the first curved segment 1112 and in contact with the inner side of the first curved segment 1112. The adhesive layer 123 is disposed on a side of the substrate 121 away from the active layer 122 and is bonded to the outer side of the diaphragm 113.

[0191] With such arrangement, 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 facilitating improvement of the problem of ion precipitation in the corner portion 1102.

[0192] In some embodiments, see Fig. 9 , and combined with other drawings. Among them, Fig. 9 An expanded cross-sectional view of the active structure 12 of the electrode assembly 11 provided in some further embodiments of the present application. Fig. 9 The cross section shown is perpendicular to the Z axis (that is, the first direction Z). That is, Fig. 9 for Figure 4 Schematic diagram of the active structure 12 of the structure shown in the unfolded state. The active layer 122 has adhesive properties. The electrode assembly 11 also includes a separator 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 separator 113 or the second curved segment 1122.

[0193] When at least a portion of the active structure 12 is disposed between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, 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 diaphragm 113 adjacent along the inner side, 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 diaphragm 113.

[0194] When at least part of the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent along the outside, 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 inside of the diaphragm 113. When at least part of the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent along the outside, 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 outside of the second curved segment 1122.

[0195] With such a configuration, there is no need to additionally configure the adhesive layer 123, making the structure of the active structure 12 very simple. Moreover, the ions released from the first curved segment 1112 can be quickly embedded in the active layer 122. In addition, the space occupied by the active structure 12 in the electrode assembly 11 can be reduced, which helps to improve the energy density of the battery 100.

[0196] In some embodiments, please refer to Figure 5 and Figure 7 , and in combination with other drawings. The electrode assembly 11 also includes a diaphragm 113, which is stacked between the positive electrode sheet 111 and the negative electrode sheet 112. The substrate 121 has an insulating property and is disposed between the first curved segment 1112 and the diaphragm 113 adjacent to 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 conductively connected to the negative electrode sheet 112.

[0197] The active layer 122 is connected to the negative electrode sheet 112, and the active layer 122 may be connected to the second curved segment 1122 of the negative electrode sheet 112, or the active layer 122 may be connected to the second straight segment 1121 of the negative electrode sheet 112, or the active layer 122 may be connected to the negative electrode tab 1123 of the negative electrode sheet 112. As an example, the active layer 122 is connected to the negative electrode tab 1123 through the metal member 124 described below.

[0198] The substrate 121 is disposed between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side, and the active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112, so that the substrate 121 is disposed between the first curved segment 1112 and the active layer 122. Since the substrate 121 has an insulating property, an insulating effect between the active layer 122 and the first curved segment 1112 can be achieved.

[0199] Furthermore, by conducting the active layer 122 with the negative electrode sheet 112, the active structure 12 can maintain the same potential as the negative electrode sheet 112, thereby making the positive electrode sheet 111 and the active structure 12 have a larger potential difference, which can increase the reaction rate of ions with the active structure 12. In this way, the active structure 12 can not only embed the ions released from the first curved segment 1112, but also release the ions so that the ions are embedded in the first curved segment 1112, that is, the active structure 12 can release the ions.

[0200] Based on the above structure, during the charging process of the battery cell 10, the positive electrode sheet 111 releases ions, which migrate to the negative electrode sheet 112 and are embedded in the negative electrode sheet 112. Specifically, the ions released from the first straight segment 1111 can be embedded in the second straight segment 1121, and the ions released from the first curved segment 1112 can be partially embedded in the second curved segment 1122, and the other part can be embedded in the active structure 12, specifically, embedded in the active layer 122 after passing through the substrate 121.

[0201] During the discharge process of the battery cell 10, the negative electrode plate 112 will release ions and embed into the positive electrode plate 111. Specifically, the ions released from the second straight segment 1121 are embedded into the first straight segment 1111, and the ions released from the second curved segment 1122 are embedded into the first curved segment 1112. In addition, the active structure 12 can also release ions, which can be embedded into the first curved segment 1112.

[0202] 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.

[0203] 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. This can not only improve the problem of ion precipitation, but also reduce the consumption of ions, 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.

[0204] It is necessary to add that, if Figure 5 and Figure 7 As shown, when the active structure 12 is bonded to the inner side of the first curved segment 1112, the bonding layer 123 is disposed on the side of the substrate 121 away from the active layer 122 and bonded to the inner side of the first curved segment 1112. When the active structure 12 is bonded to the diaphragm 113, the bonding layer 123 is disposed on the side of the active layer 122 away from the substrate 121 and bonded to the outer side of the diaphragm 113. Based on this, the substrate 121 can achieve insulation between the first curved segment 1112 and the active layer 122.

[0205] It should also be noted that when at least part of the active structure 12 is disposed between the second curved segment 1122 and the separator 113 adjacent to the outside, regardless of whether the substrate 121 of the active structure 12 has insulating properties, the separator 113 can achieve insulation between the active structure 12 and the first curved segment 1112. Based on this, the active layer 122 can be connected to the negative electrode plate 112, that is, the active structure 12 can be deionized during the discharge process of the battery cell 10 and embedded in the first curved segment 1112, so that the charge and discharge capacity of the battery 100 can still be improved.

[0206] Among them, the active layer 122 is conductively connected to the negative electrode plate 112 through the metal part 124 mentioned below, which is connected to at least one of the second curved segment 1122, the second straight segment 1121, and the negative electrode ear 1123 of the negative electrode plate 112. In addition, 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.

[0207] It is also necessary to add that when at least part of the active structure 12 is disposed between the first curved segment 1112 and the separator 113 adjacent to the inner side, and the substrate 121 is not an insulating material; or, when at least part of the active structure 12 is disposed between the first curved segment 1112 and the separator 113 adjacent to the inner side, and the active layer 122 is not connected to the negative electrode sheet 112; or, at least part of the active structure 12 is disposed between the second curved segment 1122 and the separator 113 adjacent to the outer side, and the active structure 12 is not connected to the negative electrode sheet 112. Then, during the charging process of the battery 100, part of the ions released from the first curved segment 1112 are embedded in the second curved segment 1122, and the other part are embedded in the active structure 12 and consumed by the active structure 12, which can improve the problem of ion precipitation.

[0208] 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 embed 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, and is disposed on the separator 113.

[0209] The active layer 122 is a component in the active structure 12 for embedding ions.

[0210] 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 .

[0211] In some possible designs, the active layer 122 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent to the first curved segment 1112 along the inner side, and is disposed on the outer side of the diaphragm 113 .

[0212] In some other possible designs, the active layer 122 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, and is disposed on the inner side of the diaphragm 113 .

[0213] 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 .

[0214] In some embodiments, the active layer 122 may also 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 .

[0215] In some embodiments, the material of the active layer 122 includes an active material, a conductive agent, and a binder.

[0216] The active material may be graphite, or high-capacity hard carbon, silicon carbon, silicon oxygen, titanium oxide, etc. The conductive agent may be conductive carbon, carbon nanotubes, graphene, etc. In this way, the active layer 122 can embed ions. In addition, the active layer 122 can also release ions.

[0217] 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 is conducive to the formation of the active layer 122 on the substrate 121 or the diaphragm 113.

[0218] Such a configuration enables the active layer 122 to have the property of embedding ions, so that ions can be embedded to improve the problem of ion precipitation at the corner portion 1102. In addition, the molding of the active layer 122 is also facilitated.

[0219] It should be supplemented here that by increasing the proportion of the adhesive in the active layer 122 , the active layer 122 can have a certain adhesive property 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 .

[0220] 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 part of the active structure 12 is disposed between the outer side of the second curved segment 1122 and the adjacent separator 113, and is in electrical communication with the negative electrode sheet 112.

[0221] It can be understood that the active structure 12 includes an active layer 122 , which 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 .

[0222] In this way, the active structure 12 can embed ions released from the first curved segment 1112 during the charging process of the battery cell 10, and can also release ions during the discharging process of the battery cell 10 and embed the ions into the first curved segment 1112, thereby improving the charge and discharge capacity of the battery cell 10.

[0223] In some embodiments, please refer to Figures 6 to 10 , and combined with other drawings. Among them, Fig.10 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, Fig.10 The cross section shown is perpendicular to the X-axis (ie, the second direction X). The active structure 12 includes an active layer 122 for embedding 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.

[0224] like Fig.10 As shown, the active structure 12 further includes a metal piece 124 disposed on the active layer 122 , and the metal piece 124 is conductively connected to the negative electrode plate 112 . Alternatively, the active layer 122 is in contact and conductively connected to the second curved segment 1122 .

[0225] The metal member 124 may be copper foil, aluminum foil, or the like.

[0226] like Figures 6 to 9 As shown, the metal member 124 is disposed on the active layer 122 and is electrically connected to the active layer 122 .

[0227] The metal member 124 is conductively connected to the negative electrode plate 112. The metal member 124 may be conductively connected to the second straight segment 1121 of the negative electrode plate 112; or the metal member 124 may be conductively connected to the second curved segment 1122 of the negative electrode plate 112; Fig.10 As shown, the metal part 124 may also be conductively connected to the negative electrode tab 1123 of the negative electrode sheet 112 .

[0228] The metal member 124 and the negative electrode plate 112 can be conductively connected by welding, bonding, or the like.

[0229] 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, thereby expanding the potential difference between the positive electrode plate 111 and the active structure 12, and increasing the reaction rate between the ions and the active structure 12, so as to improve the efficiency of the ions escaped from the first curved segment 1112 and embedded in the active structure 12.

[0230] It can be understood that the active layer 122 is conductively connected to the negative electrode plate 112 , and the active layer 122 can be conductively connected to the second straight segment 1121 of the negative electrode plate 112 ; the active layer 122 can be conductively connected to the second curved segment 1122 of the negative electrode plate 112 ; or the active layer 122 can be conductively connected to the negative electrode ear 1123 of the negative electrode plate 112 .

[0231] When the active layer 122 is disposed between the first curved segment 1112 and the separator 113 adjacent to the inner side, the active layer 122 can be electrically connected to the negative electrode plate 112 through the metal member 124. Specifically, the metal member 124 is electrically connected to the active layer 122. In addition, the metal member 124 is electrically connected to the second straight segment 1121, or the metal member 124 is electrically connected to the second curved segment 1122; or the metal member 124 is electrically connected to the negative electrode tab 1123.

[0232] When the active layer 122 is disposed between the second curved segment 1122 and the separator 113 adjacent to the outside, the active layer 122 can be connected to the negative electrode plate 112 by using the metal member 124, or the active layer 122 can be directly connected to the second curved segment 1122. The way in which the active layer 122 is connected to the negative electrode plate 112 by using the metal member 124 is the same as explained in the previous paragraph, and will not be repeated here.

[0233] In some embodiments, see Figure 5 , and in combination 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 .

[0234] In some embodiments, see Fig.10 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 sheet 111 and the negative electrode sheet 112 are wound around the first axis L parallel to the first direction Z.

[0235] In some embodiments, please refer to Figure 5 and Fig.10 , and in combination 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, and 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.

[0236] 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 escaped from the first curved segment 1112 can be better embedded, thereby improving the problem of ion precipitation in the corner part 1102.

[0237] In some embodiments, please refer to Figures 6 to 9 , and in combination 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.

[0238] like Figures 6 to 9 As shown, along the winding direction of the positive electrode sheet 111, the size of the active structure 12 is Figures 6 to 9 The active structure 12 in the expanded state has a first size H1, and the first size H1 is 10 mm to 20 mm, specifically 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, etc.

[0239] Such arrangement 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, thereby improving the problem of ion precipitation in the corner part 1102 and helping to improve the charge and discharge performance of the battery cell 10.

[0240] In some embodiments, see Figure 5 , and combined with other drawings. The active structure 12 is a sheet, and the thickness of the active structure 12 ranges from 20 μm to 40 μm.

[0241] 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.

[0242] In the electrode assembly 11, the thickness direction of the positive electrode sheet 111, the thickness direction of the negative electrode sheet 112 and the thickness direction 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 thickness direction and are parallel to each other. The active structure 12 is a sheet material, so that the active structure 12 can be arranged in parallel between 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 direction of the positive electrode sheet 111, the thickness direction of the negative electrode sheet 112 and the thickness direction of the separator 113.

[0243] The thickness of the active structure 12 is as follows: Figure 5 and Figures 6 to 9 As shown in the figure, the second size H2 may be 21 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 35 μm, 37 μm, 39 μm, etc.

[0244] Such a configuration allows the thickness of the active structure 12 to be designed 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 reduced, thereby minimizing the space occupied by the active structure 12 in the electrode assembly 11, which helps maintain a higher energy density of the battery 100.

[0245] Please also read Figure 2 and Figure 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.

[0246] The battery 100 provided in the embodiment of the present application can improve the problem of ion precipitation of the battery cell 10 by adopting the battery cell 10 involved in the above embodiments, which helps to improve the charge and discharge cycle performance and reliability of the battery 100.

[0247] See also Figure 1 The electric device provided in the embodiment of the present application includes a battery cell 10 or a battery 100. The battery cell 10 and the battery 100 in the present embodiment are the same as the battery cell 10 and the battery 100 in the previous embodiment. For details, please refer to the relevant description of the battery cell 10 and the battery 100 in the previous embodiment, which will not be repeated here.

[0248] The electrical device provided in the embodiment of the present application, by adopting the battery cell 10 or the battery 100 involved above, helps to improve the charge and discharge cycle performance and reliability performance of the battery 100.

[0249] See also Fig.11 , and in combination with other drawings. The present application embodiment also provides a method for processing a battery cell 10, wherein 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:

[0250] S10, die-cutting the positive electrode sheet 111;

[0251] In this step, the incoming material of the positive electrode sheet 111 is die-cut to obtain the positive electrode sheet 111 .

[0252] S20, disposing an active structure 12 on the inner side of the first curved segment 1112 of the positive electrode sheet 111;

[0253] In this step, the active structure 12 may be disposed at least on the inner side of the first first curved segment 1112 to the third first curved segment 1112 of the positive electrode sheet 111 .

[0254] In this step, the active structure 12 may be bonded to the inner side of the first curved segment 1112 .

[0255] S30 , winding the positive electrode sheet 111 and the negative electrode sheet 112 .

[0256] In this step, the positive electrode sheet 111 and the negative electrode sheet 112 provided with the active structure 12 are wound, so that the matching structure of the electrode assembly 11 and the active structure 12 can be obtained, so that the active structure 12 can be arranged between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side. Based on this, the problem of ion precipitation at the corner portion 1102 of the electrode assembly 11 can be improved.

[0257] It should be supplemented that, before step S30 , 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 .

[0258] 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 to the inner side, so as to improve the problem of ion precipitation in the corner part 1102 of the battery assembly 11.

[0259] The present application also provides a method for processing a battery cell 10, wherein 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:

[0260] S40, die-cutting the negative electrode sheet 112;

[0261] In this step, the incoming material of the negative electrode sheet 112 is die-cut to obtain the negative electrode sheet 112 .

[0262] S50, disposing an active structure 12 on the outer side of the second curved segment 1122 of the negative electrode sheet 112;

[0263] In this step, the active structure 12 may be bonded to the outer side of the second curved segment 1122 .

[0264] S60 , winding the positive electrode sheet 111 and the negative electrode sheet 112 .

[0265] In this step, the positive electrode sheet 111 and the negative electrode sheet 112 provided with the active structure 12 are wound, so that the matching structure of the electrode assembly 11 and the active structure 12 can be obtained, so that the active structure 12 can be arranged between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side. Based on this, the problem of ion precipitation at the corner portion 1102 of the electrode assembly 11 can be improved.

[0266] 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 .

[0267] 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 plate 112 after the negative electrode plate 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 to the inner side, so as to improve the problem of ion precipitation in the corner portion 1102 of the battery assembly 11.

[0268] The present application also provides a method for processing a battery cell 10, wherein 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:

[0269] 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.

[0270] It can be understood that during the winding process of the electrode assembly 11, the active structure 12 is arranged on the electrode assembly 11 so that the active structure 12 can be arranged between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side. Such arrangement can improve the problem of ion precipitation at the corner portion 1102 of the battery assembly 11.

[0271] The above three processing methods of the battery cell 10 make the arrangement of the active structure 12 on the electrode assembly 11 simple, low-cost, and less time-consuming.

[0272] As one of the embodiments of this application, Figures 3 to 6 As shown, the 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 arranged 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, and the two corner portions 1102 are arranged 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, and the first curved segment 1112 is connected to the first straight segment 1111. The negative electrode sheet 112 includes a second straight segment 1121 and a second curved segment 1122, and the second curved segment 1122 is connected to the second straight segment 1121. The separator 113 includes a third straight segment 1131 and a third curved segment 1132, and the third curved segment 1132 is connected to the third straight segment 1131. The first straight segment 1111 and the second straight segment 1121 are alternately stacked, and the third straight segment 1131 is stacked between the first straight segment 1111 and the second straight segment 1121. The first straight segment 1111, the second straight segment 1121, and the third straight segment 1131 constitute the above-mentioned straight portion 1101 of the electrode assembly 11. The first curved segment 1112 and the second curved segment 1122 are alternately stacked, and the third curved segment 1132 is stacked between the first curved segment 1112 and the second curved segment 1122. The first curved segment 1112, the second curved segment 1122, and the third curved segment 1132 constitute the above-mentioned corner portion 1102 of the electrode assembly 11. The active structure 12 is disposed between the first curved segment 1112 and the diaphragm 113 adjacent along the inner side, and is used to embed ions escaped from the first curved segment 1112 .

[0273] 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 , the adhesive layer 123 is disposed on a side of the active layer 122 away from the substrate 121 , and the adhesive layer 123 is bonded to the inner side of the first curved segment 1112 .

[0274] 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 excessive ions reaching the second curved segment 1122 of the negative electrode plate 112 and causing ion precipitation.

[0275] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: An electrode assembly, comprising a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet and the negative electrode sheet are stacked and wound; the electrode assembly comprises a straight portion and two corner portions arranged on opposite sides of the straight portion; the positive electrode sheet comprises a first straight segment and a first curved segment connected to the first straight segment, the negative electrode sheet comprises a second straight segment and a second curved segment connected to the second straight segment, the first straight segment and the second straight segment are alternately stacked to form the straight portion, and the first curved segment and the second curved segment are alternately stacked to form the corner portion; The active structure is at least partially disposed between the first curved segment and the second curved segment adjacent to the inner side, and is used for embedding ions.

2. The battery cell according to claim 1, characterized in that: 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, the active structure is provided between at least the inner side of the first first curved segment to the inner side of the third first curved segment and the corresponding adjacent second curved segments.

3. The battery cell according to claim 1 or 2, characterized in that: The electrode assembly further comprises a diaphragm, wherein the diaphragm is stacked between the positive electrode sheet and the negative electrode sheet; The active structure is provided between the first curved segment and the diaphragm adjacent along the inner side, and / or the active structure is provided between the second curved segment and the diaphragm adjacent along the outer side.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The active structure includes a substrate and an active layer disposed on the substrate and used for inserting ions. At least a portion of the substrate and at least a portion of the active layer are disposed between the first curved segment and the second curved segment adjacent to the inner side.

5. The battery cell according to claim 4, characterized in that: The active structure further includes an adhesive layer, and the substrate and / or the active layer are provided with the adhesive layer; the electrode assembly further includes a diaphragm, and the diaphragm is stacked between the positive electrode sheet and the negative electrode sheet; At least part of the active structure is arranged between the first curved segment and the diaphragm adjacent to the inner side, and is bonded to the first curved segment and / or the diaphragm through the adhesive layer, or at least part of the active structure is arranged between the second curved segment and the diaphragm adjacent to the outer side, and is bonded to the second curved segment and / or the diaphragm through the adhesive layer.

6. The battery cell according to claim 5, characterized in that: 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.

7. The battery cell according to claim 6, characterized in that: The bonding portion is disposed on a side of the active structure close to the first curved segment.

8. The battery cell according to any one of claims 5 to 7, characterized in that: The adhesive layer is disposed on the active layer and is bonded to the first curved segment.

9. The battery cell according to any one of claims 5 to 8, characterized in that: The bonding layer is a conductive adhesive layer and is arranged closer to the first bending segment than the active layer.

10. The battery cell according to any one of claims 5 to 7, characterized in that: 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.

11. The battery cell according to claim 4, characterized in that: The active layer has adhesive properties; the electrode assembly also includes a diaphragm, which is stacked between the positive electrode sheet and the negative electrode sheet; a single active layer is bonded to the first curved segment, the diaphragm or the second curved segment.

12. The battery cell according to any one of claims 4 to 11, characterized in that: The electrode assembly also includes a diaphragm, which is stacked between the positive electrode plate and the negative electrode plate; the substrate has insulating properties and is arranged between the first curved segment and the diaphragm adjacent to the inner side, and the active layer is arranged on the side of the substrate away from the first curved segment and is conductively connected to the negative electrode plate.

13. The battery cell according to any one of claims 1 to 3, characterized in that: The electrode assembly also 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 arranged between the first curved segment and the second curved segment adjacent to the inner side, and is arranged on the diaphragm.

14. The battery cell according to any one of claims 4 to 13, characterized in that: The material of the active layer includes active material, conductive agent and adhesive.

15. The battery cell according to any one of claims 1 to 14, characterized in that: The electrode assembly further comprises a diaphragm, wherein the diaphragm is stacked between the positive electrode sheet and the negative electrode sheet; 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.

16. The battery cell according to any one of claims 1 to 15, characterized in that: The active structure comprises an active layer for embedding ions, at least a portion of the active layer being disposed between the first curved segment and the second curved segment adjacent along the inner side; 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 conductively connected to the second curved segment.

17. The battery cell according to any one of claims 1 to 16, characterized in that: 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; And / or, the orthographic projection of the active structure on the first curved segment covers the first curved segment along a first direction, and the positive electrode sheet and the negative electrode sheet are wound around a first axis parallel to the first direction.

18. The battery cell according to any one of claims 1 to 17, characterized in that: Along the winding direction of the positive electrode sheet, the size of the active structure is 10 mm to 20 mm.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The active structure is in the form of a sheet, and the thickness ranges from 20 μm to 40 μm.

20. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-19.

21. An electrical device, characterized in that: Comprising the battery cell according to any one of claims 1 to 19 or the battery according to claim 20.

22. A method for processing a battery cell according to any one of claims 1 to 19, characterized in that: include: Die-cutting the positive electrode sheet; An active structure is disposed on the inner side of the first curved segment of the positive electrode plate; The positive electrode sheet and the negative electrode sheet are wound.

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

24. A method for processing a battery cell according to any one of claims 1 to 19, characterized in that: include: The positive electrode sheet and the negative electrode sheet are wound, and in the process of winding the positive electrode sheet and the negative electrode sheet, 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.

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