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

Abstract

The application is suitable for the technical field of batteries, and provides a battery monomer, a battery, a power consumption device, and a processing method of the battery monomer. The power consumption device comprises a battery, the battery comprises a battery monomer, and the battery monomer comprises an electrode assembly and an active structure. The electrode assembly comprises a positive electrode sheet and a negative electrode sheet, and the electrode assembly comprises a flat portion and two corner portions arranged on opposite sides of the flat portion. The positive electrode sheet comprises a first flat segment and a first curved segment connected with the first flat segment, and the negative electrode sheet comprises a second flat segment and a second curved segment connected with the second flat segment. The first flat segment and the second flat segment are alternately stacked to form the flat portion, and the first curved segment and the second curved segment are alternately stacked to form the corner portion. At least part of the active structure is arranged between the first curved segment and the second curved segment adjacent to the inner side. In this way, the active structure can embed ions separated from the first curved segment, so as to improve the problem of ion precipitation in the corner portion.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and more particularly relates to a battery monomer, a battery, a power utilization device, and a processing method of the battery monomer. BACKGROUND

[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 flat portion and two corner portions, and the two corner portions are arranged on opposite sides of the flat portion.

[0003] For the corner portion 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 inside the positive electrode sheet, which makes the capacity ratio of the negative electrode sheet inside the positive electrode sheet and the positive electrode sheet insufficient. In this way, during the charging of the battery monomer, 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 the ions, which will cause the problem of ion precipitation in the corner portion, affecting the charge-discharge cycle and reliability of the battery monomer. SUMMARY

[0004] In view of the above problems, the embodiments of the application provide a battery monomer, a battery, a power utilization device, and a processing method of the battery monomer, which can improve the problem that the corner portion of the electrode assembly will precipitate ions.

[0005] In a first aspect, the embodiments of the application provide a battery monomer, comprising:

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

[0007] An active structure is arranged between the first curved segment and the second curved segment adjacent to the inside, and is used for embedding ions.

[0008] The battery cell provided by the embodiments of the present application is configured to set an active structure for embedding ions between the first bending segment of the electrode assembly and the second bending segment adjacent to the inner side, so that the ions released from the first bending segment can be embedded in the second bending segment and the active structure, which can improve the problem that the ions excessively reach the second bending segment and cause partial ion precipitation. In this way, the problem of ion precipitation at the corner portion of the electrode assembly can be improved, and the charge-discharge cycle and reliability of the battery cell can be improved.

[0009] In some embodiments, the positive electrode sheet includes three or more first bending segments spaced along the winding direction of the positive electrode sheet; and the inner side of at least the first first bending segment to the inner side of the third first bending segment is provided with an active structure between the corresponding adjacent second bending segment along the winding direction of the positive electrode sheet.

[0010] By setting the active structure at the first fold to the third fold of the positive electrode sheet, the problem of ion precipitation at the site of the electrode assembly where ion precipitation is serious can be improved, thereby improving the problem of ion precipitation of the battery as a whole, and the charge-discharge cycle performance and reliability of the battery can be improved.

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

[0012] The active structure is provided between the first bending segment and the separator adjacent to the inner side, and / or the active structure is provided between the second bending segment and the separator adjacent to the outer side.

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

[0014] In some embodiments, the active structure includes a substrate and an active layer provided on the substrate and used for embedding ions, and at least part of the substrate and at least part of the active layer are provided between the first bending segment and the second bending segment adjacent to the inner side.

[0015] By configuring the active structure to include a substrate and an active layer provided on the substrate, 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 is provided with the adhesive layer; and the electrode assembly further includes a separator, and the separator is laminated 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 diaphragm adjacent to the inner side, and is bonded to the first curved segment and / or the diaphragm through the bonding 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 bonding layer.

[0018] By arranging the bonding layer, the active structure can be stably fixed to the corner portion, the problem of the active structure falling off can be improved, and the problem of ion precipitation in the corner portion can be better improved. Moreover, the active structure is bonded to the corner portion through the bonding layer, so that the fixing process of the active structure on the corner portion is very simple and easy to implement.

[0019] In some embodiments, the bonding layer includes a plurality of bonding portions arranged at intervals in the active layer or the substrate; and the bonding portion of the single bonding layer is used to bond the first curved segment, the diaphragm or the second curved segment.

[0020] In this way, the ions released from the first curved segment can be more quickly embedded in the active structure, thereby better improving the problem that the ions released from the first curved segment excessively reach the second curved segment, and further improving the problem of ion precipitation in the corner portion.

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

[0022] In this way, the ions released from the first curved segment can be more quickly embedded in the active structure, thereby better improving the problem that the ions released from the first curved segment excessively reach the second curved segment, and further improving the problem of ion precipitation in the corner portion.

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

[0024] In this way, the active layer can be as close as possible to the inner side of the first curved segment, thereby improving the efficiency of embedding the ions released from the first curved segment into the active layer, to effectively improve the problem of ion precipitation in the corner portion. Moreover, the active structure is bonded to the first curved segment, which facilitates the embedding of the ions released from the first curved segment into the active layer, to effectively improve the problem of ion precipitation in the corner portion.

[0025] In some embodiments, the bonding layer is a conductive adhesive layer and is arranged closer to the first curved segment relative to the active layer.

[0026] In this way, the ions released from the first curved segment can be quickly embedded in the active layer in the conductive environment of the bonding layer, i.e., the efficiency of the reaction between the ions and the active layer can be improved, and the problem of ion precipitation in the corner portion can be effectively improved.

[0027] In some embodiments, the adhesive layer and the active layer are arranged on opposite sides of the substrate, the adhesive layer is bonded to the separator, and the active layer is in contact with the first curved segment.

[0028] In this way, the active structure can be bonded to the corner portion, and the active layer can be directly in contact with the inner side of the first curved segment, so that the ions released from the first curved segment can be directly inserted into the active layer, thereby improving the efficiency of ion insertion into the active structure and improving the problem of ion precipitation in the corner portion.

[0029] In some embodiments, the active layer has adhesive properties; the electrode assembly further comprises a separator, the separator is laminated 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] In this way, the active structure is simple without the need for an additional adhesive layer, and the ions released from the first curved segment can be quickly inserted into the active layer.

[0031] In some embodiments, the electrode assembly further comprises a separator, the separator is laminated between the positive electrode sheet and the negative electrode sheet; the substrate has insulating properties and is arranged between the first curved segment and the separator adjacent to the inner side, the active layer is arranged on the side of the substrate away from the first curved segment and is in electrical communication with the negative electrode sheet.

[0032] In this way, the active structure can insert ions during battery charging and release ions during battery discharging, thereby improving the utilization of ions in the battery and improving the charge and discharge capacity of the battery.

[0033] In some embodiments, the electrode assembly further comprises a separator, the separator is laminated between the positive electrode sheet and the negative electrode sheet; the active structure comprises an active layer for inserting ions, at least part 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 separator.

[0034] By arranging the active layer directly on the separator, the active structure can be reduced in size and weight, thereby helping to improve the energy density of the battery.

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

[0036] In this way, the active layer has the property of inserting ions, thereby improving the problem of ion precipitation in the corner portion. Furthermore, it is beneficial for the formation of the active layer on the substrate or the separator.

[0037] In some embodiments, the electrode assembly further comprises a separator, the separator is laminated between the positive electrode tab and the negative electrode tab.

[0038] At least part of the active structure is arranged between the second bending segment and the separator adjacent to the outer side, and is in conduction with the negative electrode tab.

[0039] In this way, the active structure can embed the ions released from the first bending segment during charging of the battery cell, and can release the ions and embed the ions into the first bending segment during discharging of the battery cell, so as to improve the charging and discharging capacity of the battery cell.

[0040] In some embodiments, the active structure comprises an active layer for embedding ions, at least part of the active layer is arranged between the first bending segment and the second bending segment adjacent to the inner side.

[0041] The active structure further comprises a metal piece arranged in the active layer, the metal piece is in conduction with the negative electrode tab; or the active layer is in conduction with the second bending segment.

[0042] By the metal piece being in conduction with the negative electrode tab, or the active layer being in conduction with the second bending segment, the active structure can maintain the same potential as the negative electrode tab, expand the potential difference between the positive electrode tab and the active structure, increase the reaction rate of the ions and the active structure, and improve the efficiency of the ions released from the first bending segment embedding into the active structure.

[0043] In some embodiments, the orthographic projection of the active structure on the first bending segment covers the first bending segment along the winding direction of the positive electrode tab.

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

[0045] By adopting the above technical solutions, the active structure can cover the inner side of the first bending segment as much as possible, so as to better embed the ions released from the first bending segment, and thus the problem of ion precipitation in the corner part can be improved.

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

[0047] In this way, the active structure can better cover the inner side of the first bending segment along the winding direction of the positive electrode tab, so as to better embed the ions released from the first bending segment.

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

[0049] In this way, the thickness of the active structure is designed to be reasonable, and on the basis of efficiently embedding the ions released from the first bending segment, the thickness of the active structure is small, so as to reduce the space occupied by the active structure in the electrode assembly as much as possible, thereby helping to maintain a high energy density of the battery.

[0050] In a second aspect, the embodiments of the present application provide a battery, including the battery cell.

[0051] The battery provided by the embodiments of the present application can improve the ion release problem of the battery cell by using the battery cell related by the above embodiments, and help to improve the charge-discharge cycle performance and reliability performance of the battery.

[0052] In a third aspect, the embodiments of the present application provide a power consumption device, including the battery cell or the battery.

[0053] The power consumption device provided by the embodiments of the present application helps to improve the charge-discharge cycle performance and reliability performance of the battery by using the battery related above.

[0054] In a fourth aspect, the embodiments of the present application provide a processing method of a battery cell, including:

[0055] Die cutting the positive electrode sheet;

[0056] Setting the active structure on the inner side of the first bending segment of the positive electrode sheet;

[0057] Winding the positive electrode sheet and the negative electrode sheet.

[0058] The processing method of the battery cell provided by the embodiments of the present application can improve the ion release problem of the corner part of the battery cell, and help to improve the charge-discharge cycle performance and reliability performance of the battery cell.

[0059] In a fifth aspect, the embodiments of the present application provide a processing method of a battery cell, including:

[0060] Die cutting the negative electrode sheet;

[0061] Setting the active structure on the outer side of the second bending segment of the negative electrode sheet;

[0062] Winding the positive electrode sheet and the negative electrode sheet.

[0063] The processing method of the battery cell provided by the embodiments of the present application can improve the ion release problem of the corner part of the battery cell, and help to improve the charge-discharge cycle performance and reliability performance of the battery cell.

[0064] In a sixth aspect, the embodiments of the present application provide a processing method of a battery cell, including:

[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, the active structure is arranged between the inner side of the first bending segment of the positive electrode sheet and the outer side of the second bending segment of the negative electrode sheet.

[0066] The processing method of the battery monomer provided by the embodiments of the present application can improve the ion precipitation problem of the corner part of the battery monomer, and help to improve the charge-discharge cycle performance and reliability performance of the battery monomer.

[0067] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0068] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0069] Figure 1 The schematic diagram of the vehicle provided by some embodiments of the present application is shown in the figure;

[0070] Figure 2 The exploded schematic diagram of the battery provided by some embodiments of the present application is shown in the figure;

[0071] Figure 3 The exploded schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0072] Figure 4 The matching sectional view of the electrode assembly and the active structure of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0073] Figure 5 The enlarged view of A in the figure; Figure 4 The enlarged view of A in the figure;

[0074] Figure 6 The expanded sectional view of the active structure of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0075] Figure 7 The expanded sectional view of the active structure of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0076] Figure 8 The expanded sectional view of the active structure of the battery monomer provided by some embodiments of the present application is shown in the figure;

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

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

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

[0080] In the drawings:

[0081] 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - case; 21 - first portion; 22 - second portion; 11 - electrode assembly; 1101 - flat portion; 1102 - corner portion; 111 - positive electrode tab; 1111 - first flat segment; 1112 - first curved segment; 1113 - positive electrode lug; 112 - negative electrode tab; 1121 - second flat segment; 1122 - second curved segment; 1123 - negative electrode lug; 113 - separator; 1131 - third flat segment; 1132 - third curved segment; 12 - active structure; 121 - substrate; 122 - active layer; 123 - adhesive layer; 1231 - adhesive part; 124 - metal piece; 13 - shell; 131 - case body; 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 below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0083] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0084] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying a number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0085] In the description of the present application, the meaning of "a plurality of" is more than two, and "more than two" includes two, unless otherwise explicitly specified and limited. Accordingly, the meaning of "a plurality of groups" is more than two groups, including two groups.

[0086] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0087] In the description of the present application, the term "and / or" is only to describe the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent: A exists, A and B exist, and B exists. In addition, in the present application, the character " / " generally represents that the front and rear associated objects have an "or" relationship.

[0088] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it and equivalent parts can be substituted for the parts thereof without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. 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 which an electrochemical reaction occurs in the battery cell. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator.

[0090] For a wound-type electrode assembly, the positive electrode sheet and the negative electrode sheet are stacked and wound. The separator is provided 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 flat portion and two corner portions, and the two corner portions are respectively arranged on opposite sides of the flat portion. Specifically, the positive electrode tab, the negative electrode tab and the separator each have a flat segment and a curved segment connected to the flat segment, the flat segments of the positive electrode tab, the negative electrode tab and the separator are arranged flatly and are stacked to form the flat portion of the electrode assembly, and the curved segments of the positive electrode tab, the negative electrode tab and the separator are arranged curvedly and are stacked to form the corner portion of the electrode assembly.

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

[0093] However, for the corner portion of the electrode assembly, the winding length of the positive electrode tab is greater than the winding length of the negative electrode tab inside the positive electrode tab, which makes the capacity ratio of the negative electrode tab inside the positive electrode tab and the positive electrode tab insufficient. In this way, when the lithium ions released from the positive electrode tab of the corner portion migrate to the negative electrode tab inside, the negative electrode tab inside does not have enough space to accommodate and embed these lithium ions. That is, the lithium ions will excessively reach the negative electrode tab inside, causing the negative electrode tab inside to precipitate lithium. Therefore, the corner portion has the problem of lithium precipitation, which affects the charge-discharge cycle and reliability of the battery cell.

[0094] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, a power-using device and a processing method of the battery cell. By arranging an active structure for embedding ions between the first curved segment and the second curved segment adjacent to the inside, the ions released from the first curved segment can be embedded in the active structure in addition to the second curved segment. In this way, the problem of excessive ions reaching the second curved segment causing some ions to precipitate can be improved. In this way, the problem of the corner portion of the electrode assembly precipitating ions can be improved, and the charge-discharge cycle and reliability of the battery cell can be improved.

[0095] In some embodiments, the battery cell related to the embodiments of the present application can be used in a power-using device using the battery cell or the battery as a power source. The battery related to the embodiments of the present application can be used in a power-using device using the battery as a power source.

[0096] The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, and the like.

[0097] The battery involved in the embodiments 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 a mixed connection through a busbar. The mixed connection means that there are both series and parallel connections among the multiple battery cells.

[0098] In some embodiments, the battery can 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 can be fixed to form a battery module by rolling or the like. As an example, the multiple battery cells can also be fixed to form a battery module by an end plate, a side plate, or the like.

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

[0100] For ease of description, the embodiments of the present application take a vehicle as an example for description.

[0101] Please refer to Figure 1 , Figure 1 A schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 is internally provided with the above-mentioned battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0102] In some embodiments, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0103] Please refer to Figure 2 , Figure 2This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 is a structure with an internal accommodating space, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first portion 21 and a second portion 22, which overlap each other and jointly define the aforementioned accommodating space. The first portion 21 may be a hollow structure with an opening at one end, and the second portion 22 is a plate-like structure, which covers the opening side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the aforementioned accommodating space; or, both the first portion 21 and the second portion 22 may be hollow structures with 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 together define the aforementioned accommodating space. The box 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, multiple battery cells 10 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 10 is directly housed in the aforementioned housing space of the casing 20, such as... Figure 2 As shown. Multiple battery cells 10 can also be connected in series, parallel or mixed, and arranged and fixed to form multiple battery modules. The multiple battery modules can then be connected in series, parallel or mixed to form a whole and housed in the aforementioned housing space of the housing 20.

[0105] In some embodiments, please combine Figure 1 and Figure 2 When the battery 100 is used in a vehicle, the battery housing 20 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can be at least part of the chassis of the vehicle 1000, or a portion of the housing 20 can be at least part of the crossbeams and longitudinal beams of the vehicle 1000.

[0106] A battery cell 10 refers to the smallest unit for storing and outputting electrical energy. The battery cell 10 can be a secondary battery or a primary battery. The battery cell 10 can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0107] Please refer to the following: Figure 3 and Figure 4 , Figure 3 This is an exploded view of the battery cell 10 provided in some embodiments of this application. Figure 4 This is a cross-sectional view showing the assembly of electrode assembly 11 and active structure 12 provided in some embodiments of this application. Figure 4The cross section shown is perpendicular to the Z axis in Figure 3 The battery cell 10 includes an electrode assembly 11 and a case 13.

[0108] The electrode assembly 11 is a component in which electrochemical reactions occur in the battery cell 10. Among them, 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 part of the positive electrode sheet 111 has an active material, a part of the negative electrode sheet 112 has an active material, and the part of the positive electrode sheet 111 without the active material and the part of the negative electrode sheet 112 without the active material each constitute a tab. The tab of the positive electrode sheet 111 is a positive electrode tab 1113, and the tab of the negative electrode sheet 112 is a negative electrode tab 1123, and the positive electrode tab 1113 and the negative electrode tab 1123 can be located at one end of the electrode assembly 11 or at opposite ends of the electrode assembly 11, respectively.

[0109] In the battery cell 10, the number of electrode assemblies 11 can be one or multiple.

[0110] In some embodiments, the battery cell 10 can also 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 can 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, which migrate to the negative electrode sheet 112 and are embedded in the active material of the negative electrode sheet 112. During the discharging process of the battery cell 10, the ions are released from the active material of the negative electrode sheet 112 and migrate to the positive electrode sheet 111 to be embedded in the active material of the positive electrode sheet 111.

[0111] The case 13 includes a shell 131 and an end cover 132, which are components for jointly defining the internal environment of the battery cell 10, and the internal environment defined by the shell 131 and the end cover 132 is used to accommodate the electrode assembly 11 and the electrolyte. Among them, the shell 131 and the end cover 132 can be independent components, specifically, the shell 131 has an opening, and the end cover 132 is provided 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 cover 132 can also be an integrated structure, specifically, the end cover 132 and the shell 131 can form a common connecting surface before the electrode assembly 11 enters the shell, and when the electrode assembly 11 needs to be packaged after entering the shell, the end cover 132 is then closed to the shell 131.

[0112] Among them, the number of end covers 132 can be one. The number of end covers 132 can also be two, and the two end covers 132 are respectively provided at opposite ends of the shell 131.

[0113] The shell 131 can be cylindrical, square, or the like, and can be determined according to the specific shape and size of the electrode assembly 11. The shell 131 and the end cover 132 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0114] The electrode assembly 11 related to the embodiments of the present application is developed based on the lithium precipitation problem of the battery monomer 10 in the charging and discharging process, but its application scenarios are not limited to this. Understandably, the electrode assembly 11 related to the embodiments of the present application can be applied to a lithium ion battery to improve the problem of lithium precipitation; can be applied to a sodium ion battery to improve the problem of sodium ion precipitation; and can be applied to other types of battery monomers 10 to improve the problem of precipitation of other types of ions. That is, the electrode assembly 11 related to the embodiments of the present application can be used for various types of battery monomers 10 to improve the problem of ion precipitation in the charging and discharging process of the battery monomer 10.

[0115] Please refer to Figure 3 to Figure 5 , Figure 4 the matching cross-sectional view of the electrode assembly 11 and the active structure 12 provided by some embodiments of the present application, Figure 4 the cross-section is perpendicular to the Z-axis (i.e. the first direction Z), Figure 5 for Figure 4 the battery monomer 10 provided by the embodiments of the present application includes the electrode assembly 11 and the active structure 12. The electrode assembly 11 includes the positive electrode sheet 111 and the 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 flat portion 1101 and two corner portions 1102, and the two corner portions 1102 are arranged on opposite sides of the flat portion 1101. The positive electrode sheet 111 includes a first flat segment 1111 and a first curved segment 1112, and the first curved segment 1112 is connected to the first flat segment 1111. The negative electrode sheet 112 includes a second flat segment 1121 and a second curved segment 1122, and the second curved segment 1122 is connected to the second flat segment 1121. The first flat segment 1111 and the second flat segment 1121 are alternately stacked to form the above-mentioned flat 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 above-mentioned corner portion 1102 of the electrode assembly 11. At least part of the active structure 12 is arranged between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side, and is used for embedding ions.

[0116] Understandably, the positive electrode sheet 111 and the negative electrode sheet 112 are stacked, and the whole is wound to form the electrode assembly 11.

[0117] As shown in Figure 3 and Figure 4 , the overall of the positive electrode tab 111 and the negative electrode tab 112 are wound and arranged around the first axis L to constitute the electrode assembly 11. The first axis L passes through the center position of the electrode assembly 11 and is parallel to the first direction Z.

[0118] As shown in Figure 3 and Figure 4 , the electrode assembly 11 can be divided into a flat portion 1101 and two corner portions 1102, which are respectively arranged on opposite sides of the flat portion 1101. Among them, Figure 4 The electrode assembly 11 is divided into a flat portion 1101 and a corner portion 1102 by a dashed line in the middle.

[0119] After the positive electrode tab 111 and the negative electrode tab 112 are wound and arranged to constitute the electrode assembly 11, as shown in Figure 4 , one part of the positive electrode tab 111 is in a straight distribution state, which is a first flat segment 1111; the other part of the positive electrode tab 111 is in a curved distribution state, which is a first curved segment 1112. One part of the negative electrode tab 112 is in a straight distribution state, which is a second flat segment 1121; the other part of the negative electrode tab 112 is in a curved distribution state, which is a second curved segment 1122.

[0120] As shown in Figure 4 and Figure 5 , the positive electrode tab 111 includes a plurality of first flat segments 1111 and a plurality of first curved segments 1112. Along the winding direction of the positive electrode tab 111, each first flat segment 1111 and each first curved segment 1112 are alternately distributed and connected, so that the plurality of first flat segments 1111 and the plurality of first curved segments 1112 are connected to constitute the positive electrode tab 111. Correspondingly, the negative electrode tab 112 includes a plurality of second flat segments 1121 and a plurality of second curved segments 1122. Along the winding direction of the negative electrode tab 112, each second flat segment 1121 and each second curved segment 1122 are alternately distributed and connected, so that the plurality of second flat segments 1121 and the second curved segments 1122 are connected to constitute the negative electrode tab 112.

[0121] Among them, the winding direction of the positive electrode tab 111 refers to the direction of the positive electrode tab 111 extending from the head end to the tail end of the positive electrode tab 111, and the head end of the positive electrode tab 111 is closer to the center position of the electrode assembly 11 than the tail end. The winding direction of the negative electrode tab 112 refers to the direction of the negative electrode tab 112 extending from the head end to the tail end of the negative electrode tab 112, and the head end of the negative electrode tab 112 is closer to the center position of the electrode assembly 11 than the tail end.

[0122] As shown in Figure 3 to Figure 5As shown, the plurality of first flat segments 1111 and the plurality of second flat segments 1121 constitute the flat portion 1101 of the electrode assembly 11, specifically, each first flat segment 1111 and each second flat segment 1121 are alternately and laminatedly arranged along the second direction X. Understandably, the flat portion 1101 of the electrode assembly 11 is in a flat extension state. Specifically, the positive electrode tab 111 located in the flat portion 1101 is a first flat segment 1111, and the negative electrode tab 112 located in the flat portion 1101 is a second flat segment 1121, that is, the positive electrode tab 111 and the negative electrode tab 112 located in the flat portion 1101 are both in a flat state distribution.

[0123] The plurality of first curved segments 1112 and the plurality of second curved segments 1122 constitute two corner portions 1102 of the electrode assembly 11, and the two corner portions 1102 are respectively located on opposite sides of the flat 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 and laminatedly arranged. Understandably, each corner portion 1102 is in a curved extension state. Specifically, the positive electrode tab 111 located in the corner portion 1102 is a first curved segment 1112, and the negative electrode tab 112 located in the corner portion 1102 is a second curved segment 1122, that is, the positive electrode tab 111 and the negative electrode tab 112 located in the corner portion 1102 are both in a curved state distribution.

[0124] Wherein, the first direction Z is perpendicular to the second direction X, the first direction Z is perpendicular to the third direction Y, and the second direction X is perpendicular to the third direction Y. As shown, Figure 3 to Figure 5 The first direction Z is parallel to the Z axis, the second direction X is parallel to the X axis, and the third direction Y is parallel to the Y axis. The X axis, the Y axis and the Z axis constitute Figure 3 a spatial coordinate system, that is, the X axis, the Y axis and the Z axis are respectively three mutually perpendicular coordinate axes in the spatial coordinate system. And the X axis and the Y axis constitute Figure 4 and Figure 5 a planar coordinate system.

[0125] Understandably, the positive electrode tab 111 includes the first flat segment 1111, the first curved segment 1112 and the positive electrode lug 1113. The first flat segment 1111 and the first curved segment 1112 are parts of the positive electrode tab 111 having active material, and the part of the positive electrode tab 111 without active material constitutes the positive electrode lug 1113. The positive electrode lug 1113 can be conductively connected with the first flat segment 1111, or can be conductively connected with the first curved segment 1112.

[0126] Correspondingly, the negative pole piece 112 includes a second straight segment 1121, a second curved segment 1122, and a negative pole tab 1123. The second straight segment 1121 and the second curved segment 1122 are portions of the negative pole piece 112 having active material, and the portion of the negative pole piece 112 not having active material constitutes the negative pole tab 1123. The negative pole tab 1123 can be in conductive connection with the second straight segment 1121 or the second curved segment 1122.

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

[0128] The at least part of the active structure 12 disposed between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side means that the at least part of the active structure 12 is disposed between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side of the first curved segment 1112. It should be noted that in the corner portion 1102, the first curved segments 1112 and the second curved segments 1122 are alternately arranged. In this way, among the first curved segments 1112 and the second curved segments 1122 adjacent in the third direction Y, there can be a case 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 to the inner side means the second curved segment 1122 located on the inner side of the first curved segment 1112 and adjacent to the first curved segment 1112 in the third direction Y. The inner side of the first curved segment 1112 means the side of the first curved segment 1112 facing the center position of the electrode assembly 11 in the third direction Y. The outer side of the second curved segment 1122 means the side of the second curved segment 1122 away from the center position of the electrode assembly 11 in 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 to the inner side, so that the active structure 12 can embed ions precipitated from the first curved segment 1112.

[0131] The electrode assembly 11 provided by the embodiment of the present application can improve the problem of ion precipitation in the corner portion 1102 of the electrode assembly 11, and thus can improve the charge-discharge cycle performance and reliability of the battery 100.

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

[0133] In addition, by arranging the active structure 12 in the corner portion 1102, the active structure 12 fills between the first curved segment 1112 and the second curved segment 1122, which can optimize the bending curvature of the corner portion 1102, help to improve the ion transmission kinetics of the corner portion 1102, and help 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, different proportions of active substances can be coated on the first flat segment 1111 and the first curved segment 1112 of the positive electrode tab 111, so that the ions released by the first curved segment 1112 can match the accommodation space of the second curved segment 1122 of the negative electrode tab 112, thereby improving the problem of ion precipitation in the corner portion 1102. However, this requires that the positive electrode tab 111 be coated with different proportions of active substances in an intermittent manner during the manufacturing process of the positive electrode tab 111 to produce a special positive electrode tab 111, which increases the process difficulty. The electrode assembly 11 provided by the embodiment of the present application can improve the problem of ion precipitation in the corner portion 1102 by arranging the 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 be easy to produce.

[0135] In some embodiments, please refer to Figure 4, and in combination with other drawings. The positive electrode tab 111 includes three or more first curved segments 1112, which are sequentially and spacedly arranged along the winding direction of the positive electrode tab 111. Along the winding direction of the positive electrode tab 111, the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side of the first curved segment 1112 are provided with the active structure 12.

[0136] Among them, three or more, including three. That is, the positive electrode tab 111 includes three or more first curved segments 1112, which can include three first curved segments 1112, or 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 tab 111, the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side of the first curved segment 1112 are provided with the active structure 12, the second curved segment 1112 and the second curved segment 1122 adjacent to the inner side of the second curved segment 1112 are also provided with the active structure 12, and the third curved segment 1112 and the second curved segment 1122 adjacent to the inner side of the third curved segment 1112 are also provided with the active structure 12. Based on this, the active structure 12 inside the first curved segment 1112 can improve the problem of ion precipitation at the first curved segment 1112, the active structure 12 inside the second curved segment 1112 can improve the problem of ion precipitation at the second curved segment 1112, and the active structure 12 inside the third curved segment 1112 can improve the problem of ion precipitation at the third curved segment 1112. That is, along the winding direction of the positive electrode tab 111, the first fold to the third fold of the positive electrode tab 111 are provided with the active structure 12, so as to improve the problem of ion precipitation at the first fold to the third fold of the positive electrode tab 111. Among them, the first curved segment 1112 refers to the first curved segment 1112 closest to the center position of the electrode assembly 11.

[0138] It should be noted that during the charging process of the battery 100, ions at the first fold to the fifth fold of the positive electrode tab 111 are prone to excessive arrival at the negative electrode tab 112, resulting in ion precipitation phenomenon. In particular, ions at the first fold to the third fold of the positive electrode tab 111 are more prone to precipitation.

[0139] By providing the above-mentioned active structure 12 at the first fold to the third fold of the positive electrode tab 111, the problem of ion precipitation at the part of the electrode assembly 11 where ion precipitation is serious can be improved, thereby the problem of ion precipitation of the battery 100 can be improved as a whole, and the charge-discharge cycle performance and reliability of the battery 100 can be improved.

[0140] In some embodiments, the active structure 12 can be arranged at the fourth fold and the fifth fold of the positive electrode tab 111, which can further improve the ion precipitation problem of the corner portion 1102 of the electrode assembly 11.

[0141] In some embodiments, please refer to Figure 4 and Figure 5 together with other drawings. The electrode assembly 11 further comprises a separator 113, which is laminated between the positive electrode tab 111 and the negative electrode tab 112.

[0142] The separator 113 is laminated between the positive electrode tab 111 and the negative electrode tab 112 to achieve insulation between the positive electrode tab 111 and the negative electrode tab 112, so as to avoid internal short circuit of the electrode assembly 11 as much as possible.

[0143] As shown in Figure 4 and Figure 5 , the separator 113 is laminated between the positive electrode tab 111 and the negative electrode tab 112, and is wound with the positive electrode tab 111 and the negative electrode tab 112 to form the electrode assembly 11. Among them, one part of the separator 113 is arranged in a flat state and is laminated between the first flat segment 1111 of the positive electrode tab 111 and the second flat segment 1121 of the negative electrode tab 112, so as to jointly form a flat portion 1101 of the electrode assembly 11 with the first flat segment 1111 and the second flat segment 1121. Another part of the separator 113 is arranged in a curved state and is laminated between the first curved segment 1112 of the positive electrode tab 111 and the second curved segment 1122 of the negative electrode tab 112, so as to jointly form a corner portion 1102 of the electrode assembly 11 with the first curved segment 1112 and the second curved segment 1122.

[0144] As shown in Figure 4 and Figure 5 , the separator 113 comprises a plurality of third flat segments 1131 and a plurality of third curved segments. Along the winding direction of the separator 113, each third flat segment 1131 and each third curved segment 1132 are alternately distributed and connected to connect the plurality of third flat segments 1131 and the plurality of third curved segments 1132 to form the separator 113. Among them, the winding direction of the separator 113 refers to the direction from the leading end of the separator 113 to the tail end of the separator 113, and the leading end of the separator 113 is closer to the center position of the electrode assembly 11 than the tail end.

[0145] As shown in Figure 4 and Figure 5As shown, the diaphragm 113 located at the flat portion 1101 is a third flat segment 1131, which is arranged between the first flat segment 1111 and the second flat segment 1121 along the second direction X to form the flat portion 1101 together with the first flat segment 1111 and the second flat segment 1121, so that the flat portion 1101 of the electrode assembly 11 is in a flat extension state. The diaphragm 113 located at the corner portion 1102 is a third curved segment 1132, which is arranged between the first curved segment 1112 and the second curved segment 1122 to form the corner portion 1102 together 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 flat segment 1131 is located between the first flat segment 1111 and the second flat segment 1121 to achieve insulation between the first flat segment 1111 and the second flat 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 diaphragm 113 achieves insulation between the positive electrode tab 111 and the negative electrode tab 112.

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

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

[0149] Based on this, when the active structure 12 is only one, at least part of the active structure 12 can be arranged between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side, or arranged between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side. When the number of active structures 12 is multiple, the multiple active structures 12 can all be arranged between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side; or all be arranged between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side; or at least one active structure 12 is arranged between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side, and at least one active structure 12 is arranged between the second curved segment 1122 and the diaphragm 113 adjacent to 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 to the inner side, or arranging at least part of the active structure 12 between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, the active structure 12 can be located on the inner side of the first curved segment 1112, so that the ions released from the first curved segment 1112 can be embedded into the active structure 12 on the inner side, so as to improve the problem of ion precipitation in the corner portion 1102. In this way, the arrangement of the active structure 12 in the corner portion 1102 is very flexible.

[0151] In some embodiments, please refer to Figure 5 and Figure 6 , and combine with other drawings. Among them, Figure 6 is a developed cross-sectional schematic view of the active structure 12 of the battery monomer 10 provided in some embodiments of the present application, Figure 6The cross section shown is perpendicular to the Z-axis (i.e., the first direction Z). That is, Figure 6 To Figure 4 A schematic diagram of the active structure 12 in the unfolded state is shown. It should be noted that the first curved segment 1112 and the second curved segment 1122 are arranged such that at least part of the active structure 12 is arranged between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side, the active structure 12 is also in the curved state. Figure 6 to Figure 9 The active structure 12 shown is in a flat state, that is, in an unfolded state. The active structure 12 includes a substrate 121 and an active layer 122. The active layer 122 is arranged on the substrate 121 and is used to embed ions. At least part of the substrate 121 and at least part of the active layer 122 are arranged between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side.

[0152] The substrate 121 refers to the base part of the active structure 12, which is used to support the active layer 122, so that the active layer 122 can be formed on the substrate 121.

[0153] The active layer 122 refers to the part of the active structure 12 that has active substances, and the active layer 122 can be used to embed ions.

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

[0155] Based on the above structure, during charging of the battery 100, the ions released from the first curved segment 1112 can be embedded in the second curved segment 1122, and can also be embedded in the active layer 122 of the active structure 12, so that the problem of ion precipitation caused by excessive ions reaching the second curved segment 1122 can be improved.

[0156] By arranging the active structure 12 to include the substrate 121 and the active layer 122 arranged on the substrate 121, 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 that is resistant to heat, so that the active structure 12 can maintain normal use after the electrode assembly 11 generates heat, so that the active structure 12 can normally insert ions, thereby improving the problem of ion precipitation.

[0158] For example, the substrate 121 can be, but is not limited to, a biaxially oriented polypropylene film, polyethylene, polypropylene, polyimide, polyethylene terephthalate, etc.

[0159] In some embodiments, as shown in Figure 5 and Figure 6 , 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 efficiently insert ions, thereby improving the problem of ion precipitation.

[0160] In some embodiments, please refer to Figure 5 to Figure 7 , and combine with other drawings. Among them, Figure 7 is a development cross-sectional view of the active structure 12 of the battery cell 10 provided by another embodiment of the present application. Figure 7 The cross section is perpendicular to the Z axis (i.e. the first direction Z). That is, Figure 7 is a schematic view of the active structure 12 in the development state of the structure shown in Figure 4 . The active structure 12 further includes an adhesive layer 123. In some possible designs, as shown in Figure 6 , the active layer 122 is provided with the adhesive layer 123; or, in some possible designs, as shown in Figure 7 , the substrate 121 is provided with the adhesive layer 123; or, in some possible designs, the substrate 121 and the active layer 122 are both provided with the adhesive layer 123.

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

[0162] At least part of the active structure 12 can be arranged between the first curved segment 1112 and the separator 113 adjacent to the inner side, or at least part of the active structure 12 can also be arranged between the second curved segment 1122 and the separator 113 adjacent to the outer side.

[0163] When at least part 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 adhered 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 adhered to the diaphragm 113 through the adhesive layer 123; or both sides of the active structure 12 are provided with adhesive layers 123 and are respectively adhered to the first curved segment 1112 and the diaphragm 113 through the adhesive layers 123.

[0164] When at least part of the active structure 12 is disposed between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, one side of the active structure 12 is provided with an adhesive layer 123 and is adhered to the second curved segment 1122 through the adhesive layer 123; or the other side of the active structure 12 is provided with an adhesive layer 123 and is adhered to the diaphragm 113 through the adhesive layer 123; or both sides of the active structure 12 are provided with adhesive layers 123 and are respectively adhered to the second curved segment 1122 and the diaphragm 113 through the adhesive layers 123.

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

[0166] When the active layer 122 is provided with an adhesive layer 123, as shown in FIG. 1C, 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 an adhesive layer 123, as shown in FIG. 1D, the adhesive layer 123 is disposed on the side of the substrate 121 away from the active layer 122. Figure 6 Figure 7

[0167] ​​It should be noted that when at least part of the active structure 12 is arranged between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side, in some possible designs, the active structure 12 is bonded to the first curved segment 1112 through the bonding layer 123, specifically, the bonding layer 123 is bonded to the inner side of the first curved segment 1112. Based on this, when the active layer 122 is arranged on the side of the substrate 121 facing the first curved segment 1112, the bonding layer 123 is arranged on the side of the active layer 122 away from the substrate 121; when the active layer 122 is arranged on the side of the substrate 121 away from the first curved segment 1112, the bonding layer 123 is arranged 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 bonding layer 123, specifically, the bonding 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 bonding 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 bonding layer 123 is arranged on the side of the active layer 122 away from the substrate 121. In yet other possible designs, the active structure 12 is bonded to the first curved segment 1112 and the diaphragm 113 through the bonding 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 the bonding layer 123, that is, there are two bonding layers 123. One of the bonding layers 123 is bonded to the inner side of the first curved segment 1112, and the other bonding 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 to the outer side, in some possible designs, the active structure 12 is bonded to the second curved segment 1122 by the bonding layer 123, specifically, the bonding layer 123 is bonded to the outer side 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 bonding 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 bonding 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 by the bonding layer 123, specifically, the bonding layer 123 is bonded to the inner side of the diaphragm 113. Based on this, when the active layer 122 is disposed on the side of the substrate 121 facing the second curved segment 1122, the bonding layer 123 is disposed on the side of the substrate 121 away from the active layer 122; when the active layer 122 is disposed on the side of the substrate 121 away from the second curved segment 1122, the bonding layer 123 is disposed on the side of the active layer 122 away from the substrate 121. In yet other possible designs, the active structure 12 is bonded to the second curved segment 1122 and the diaphragm 113 by the bonding 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 the bonding layer 123, that is, there are two bonding layers 123. One of the bonding layers 123 is bonded to the outer side of the second curved segment 1122, and the other bonding layer 123 is bonded to the inner side of the diaphragm 113.

[0169] By disposing the bonding layer 123, the active structure 12 can be stably fixed to the corner portion 1102, the problem of the active structure 12 falling off can be improved, and thus the problem of ion precipitation of the corner portion 1102 can be better improved. Moreover, the active structure 12 is bonded to the corner portion 1102 by the bonding 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 in combination with other drawings. Among them, Figure 8 is an expanded cross-sectional view of the active structure 12 of the electrode assembly 11 provided in some other embodiments of the present application.

[0171] Figure 8 The cross section shown is perpendicular to the Z axis (that is, the first direction Z). That is, Figure 8 is Figure 4The diagram shows the active structure 12 in its unfolded state. A single adhesive layer 123 includes a plurality of adhesive portions 1231 spaced apart from the active layer 122 or the substrate 121. The adhesive portions 1231 of the single adhesive 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 part of the adhesive layer 123, and each adhesive portion 1231 is used to perform the adhesive function.

[0173] Understandably, 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, a plurality of adhesive portions 1231 of the adhesive layer 123 are distributed at intervals on the active layer 122. When the adhesive layer 123 is disposed on the substrate 121, a plurality of adhesive portions 1231 of the adhesive layer 123 are distributed at intervals on the substrate 121.

[0175] When adhesive layer 123 is bonded to the first curved segment 1112, adhesive portion 1231 is bonded to the first curved segment 1112. When adhesive layer 123 is bonded to diaphragm 113, adhesive portion 1231 is bonded to diaphragm 113. When adhesive layer 123 is bonded to the second curved segment 1122, adhesive portion 1231 is bonded to the second curved segment 1122.

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

[0177] In some embodiments, the adhesive portion 1231 is disposed on the side of the active structure 12 near the first curved segment 1112.

[0178] Understandably, when the active layer 122 is disposed on the side of the substrate 121 facing the first curved segment 1112, the adhesive portion 1231 is disposed on the side of the active layer 122 away from the substrate 121. Similarly, when the active layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112, the adhesive portion 1231 is disposed on the side of the substrate 121 away from the active layer 122. Based on this, the adhesive portion 1231 can be disposed on the side of the active structure 12 close to 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 adjacent inner membrane 113, the active structure 12 is bonded to the inner side of the first curved segment 1112 via the adhesive portion 1231; when the active structure 12 is disposed between the second curved segment 1122 and the adjacent outer membrane 113, the active structure 12 is bonded to the inner side of the membrane 113 via the adhesive portion 1231.

[0179] 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 gaps between the adhesive portions 1231 and the adhesive portions 1231, so that the contact area of the inner side of the first curved segment 1112 and the substrate 121 or the contact area of the inner side of the first curved segment 1112 and the active layer 122 can be increased on the basis that the active structure 12 and the first curved segment 1112 can maintain a better adhesive effect. When the active structure 12 is arranged between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, the inner side of the diaphragm 113 can directly contact the substrate 121 or the active layer 122 through the gaps between the adhesive portions 1231 and the adhesive portions 1231, so that the contact area of the inner side of the diaphragm 113 and the substrate 121 or the contact area of the inner side of the diaphragm 113 and the active layer 122 can be increased on the basis that the active structure 12 and the diaphragm 113 can maintain a better adhesive effect. In this way, the ions discharged from the first curved segment 1112 can be more quickly inserted into the active structure 12, so that the problem that the ions discharged from the first curved segment 1112 excessively reach the second curved segment 1122 can be better improved, and the problem of ion precipitation at the corner portion 1102 can be improved.

[0180] In some embodiments, reference is made to Figure 5 and Figure 6 , and in combination with other drawings. The adhesive layer 123 is arranged on the active layer 122 and adheres to the first curved segment 1112.

[0181] As shown in Figure 6 , and in combination with Figure 5 , the active structure 12 is arranged between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side. Moreover, 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 active layer 122 away from the substrate 121, and the adhesive layer 123 adheres to the inner side of the first curved segment 1112.

[0182] In this way, the active layer 122 can be as close as possible to the inner side of the first curved segment 1112, so that the efficiency of the ions discharged from the first curved segment 1112 being inserted into the active layer 122 can be improved, so as to effectively improve the problem of ion precipitation at the corner portion 1102. Moreover, the active structure 12 adheres to the first curved segment 1112, so that the ions discharged from the first curved segment 1112 can be inserted into the active layer 122, so as to effectively improve the problem of ion precipitation at the corner portion 1102.

[0183] It should be noted that reference is made to Figure 5 ,Figure 6 and Figure 8 When the adhesive layer 123 includes a plurality of adhesive portions 1231, the plurality of adhesive portions 1231 are distributed at intervals on the side of the active layer 122 away from the substrate 121, and are all adhered to the inner side of the first curved segment 1112. In this way, the area of the active layer 122 directly in contact with 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 inserted into the active layer 122, thereby improving the efficiency of ion insertion into the active structure 12, and thus effectively improving the problem of ion precipitation in the corner portion 1102.

[0184] In some embodiments, please refer to Figure 5 to Figure 8 , and in combination with other drawings. The adhesive layer 123 is a conductive adhesive layer, and is arranged 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 a conductive property.

[0186] In some possible designs, the active layer 122 is arranged on the side of the substrate 121 facing the first curved segment 1112, and the adhesive layer 123 is arranged on the side of the active layer 122 away from the substrate 121. In other possible designs, the active layer 122 is arranged on the side of the substrate 121 away from the first curved segment 1112, and the adhesive layer 123 is arranged on the side of the substrate 121 away from the active layer 122. Based on the above designs, the adhesive layer 123 is arranged closer to the first curved segment 1112 than the active layer 122. When the active structure 12 is arranged between the first curved segment 1112 and the separator 113 adjacent to the inner side, the adhesive layer 123 is adhered to the inner side of the first curved segment 1112; when the active structure 12 is arranged between the second curved segment 1122 and the separator 113 adjacent to the outer side, the adhesive layer 123 is adhered to the inner side of the separator 113.

[0187] In this way, by arranging the adhesive layer 123 closer to the first curved segment 1112 than the active layer 122, the ions released from the first curved segment 1112 need to pass through the adhesive layer 123 before being inserted into the active layer 122. Since the adhesive layer 123 is a conductive adhesive layer, the active structure 12 can be stably adhered to the corner portion 1102, and the ions released from the first curved segment 1112 can be quickly inserted into 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, thereby effectively improving the problem of ion precipitation in the corner portion 1102.

[0188] In some embodiments, the material of the adhesive layer 123 can include an adhesive including at least one of acrylic, polyester, and conductive particles including 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 adhesive layer 123 has good adhesion to enable the active structure 12 to be stably adhered to the corner portion 1102. In addition, the adhesive layer 123 also has a conductive capability, thereby improving the efficiency of the ions released from the first curved segment 1112 being inserted into the active structure 12, 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 arranged on opposite sides of the substrate 121, the adhesive layer 123 is adhered to the separator 113, and the active layer 122 is in contact with the first curved segment 1112.

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

[0191] In this way, on the basis of the active structure 12 being adhered to the corner portion 1102, the active layer 122 can be directly in contact with the inner side of the first curved segment 1112, so that the ions released from the first curved segment 1112 can be directly inserted into the active layer 122, thereby improving the efficiency of the ions released from the first curved segment 1112 being inserted into the active structure 12, so as to improve the problem of ion precipitation in the corner portion 1102.

[0192] In some embodiments, please refer to Figure 9 , and in combination with other drawings. Among them, Figure 9 is an expanded cross-sectional view of the active structure 12 of the electrode assembly 11 according to some embodiments of the present application. Figure 9 The cross-section shown is perpendicular to the Z-axis (i.e., the first direction Z). That is, Figure 9 is Figure 4 a schematic view of the active structure 12 in an expanded state of the structure shown. The active layer 122 has adhesion. The electrode assembly 11 further includes a separator 113, which is laminated between the positive electrode tab 111 and the negative electrode tab 112. A single active layer 122 is adhered to the first curved segment 1112, the separator 113, or the second curved segment 1122.

[0193] 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 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 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 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 separator 113.

[0194] When 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 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 separator 113. When 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 layer 122 is disposed on the side of the substrate 121 away from the first curved segment 1112, the active layer 122 is bonded to the outer side of the second curved segment 1122.

[0195] In this way, there is no need to additionally dispose the bonding layer 123, so that the structure of the active structure 12 is very simple. Moreover, the ions released by the first curved segment 1112 can be quickly inserted into the active layer 122. In addition, the occupied space of 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 together with other drawings. The electrode assembly 11 further includes a separator 113, which is laminated between the positive electrode tab 111 and the negative electrode tab 112. The substrate 121 has an insulating property and is disposed between the first curved segment 1112 and the separator 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 in conduction with the negative electrode tab 112.

[0197] The active layer 122 is in conduction with the negative electrode tab 112, which can be in conduction with the second curved segment 1122 of the negative electrode tab 112, in conduction with the second straight segment 1121 of the negative electrode tab 112, or in conduction with the negative electrode tab 1123 of the negative electrode tab 112. As an example, the active layer 122 is in conduction with the negative electrode tab 1123 through the metal piece 124 described below.

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

[0199] Furthermore, the active structure 12 can maintain the same potential as the negative electrode tab 112 by being in conduction with the negative electrode tab 112, so that a larger potential difference between the positive electrode tab 111 and the active structure 12 can be obtained, and the reaction rate of ions with the active structure 12 can be increased. In this way, the active structure 12 can not only embed ions released from the first curved segment 1112, but also release ions to embed the ions in the first curved segment 1112, that is, the active structure 12 can release and embed ions.

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

[0201] During the discharging process of the battery monomer 10, the negative electrode tab 112 releases ions, which are embedded in the positive electrode tab 111. Specifically, the ions released from the second flat segment 1121 are embedded in the first flat segment 1111, and the ions released from the second curved segment 1122 are embedded in the first curved segment 1112. Furthermore, the active structure 12 can also release ions, which can be embedded in 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 monomer 10, ions are released from the negative electrode tab 112 and the active structure 12 and embedded in the positive electrode tab 111.

[0203] In this way, the active structure 12 can embed ions during the charging process of the battery monomer 10 and release ions during the discharging process of the battery monomer 10, which 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, thereby improving the utilization rate of ions in the battery monomer 10, and thus the charging and discharging capacity of the battery monomer 10 can be improved, and the charging and discharging performance of the battery monomer 10 can be improved.

[0204] It needs to be further explained that, as shown in Figure 5 and Figure 7 When the active structure 12 is bonded to the inner side of the first curved segment 1112, the bonding layer 123 is arranged on the side of the substrate 121 away from the active layer 122, and is 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 arranged on the side of the active layer 122 away from the substrate 121, and is 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 also needs to be further explained that, when at least part of the active structure 12 is arranged between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, regardless of whether the substrate 121 of the active structure 12 has insulation performance, the diaphragm 113 can achieve insulation between the active structure 12 and the first curved segment 1112. Based on this, the active layer 122 can be made to be conductive with the negative pole tab 112, that is, the active structure 12 can be made to be able to release ions during discharging of the battery monomer 10, and be 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 conductive with the negative pole tab 112, in addition to being conductive with at least one of the second curved segment 1122, the second straight segment 1121, and the negative pole tab 112 connected to the negative pole tab 112 through the metal piece 124 involved below, the active layer 122 can also be made to directly contact the second curved segment 1122 to achieve the conductive effect between the active layer 122 and the negative pole tab 112.

[0207] It also needs to be further explained that, when at least part of the active structure 12 is arranged between the first curved segment 1112 and the diaphragm 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 arranged between the first curved segment 1112 and the diaphragm 113 adjacent to the inner side, and the active layer 122 is not conductive with the negative pole tab 112; or, at least part of the active structure 12 is arranged between the second curved segment 1122 and the diaphragm 113 adjacent to the outer side, and the active structure 12 is not conductive with the negative pole tab 112. Then during charging of the battery 100, part of the ions released by 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, so that the problem of ion precipitation can be improved.

[0208] In some embodiments, the electrode assembly 11 further comprises a separator 113, which is laminated between the positive electrode tab 111 and the negative electrode tab 112. The active structure 12 comprises an active layer 122 for embedding ions, at least part of the active layer 122 is arranged between the first curved segment 1112 and the second curved segment 1122 adjacent to the inner side, and arranged on the separator 113.

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

[0210] It can be understood that the separator 113 serves as the substrate 121 of the active layer 122, that is, the active layer 122 can be directly formed on the separator 113.

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

[0212] In another possible design, the active layer 122 is arranged between the second curved segment 1122 and the separator 113 adjacent to the outer side, and arranged on the inner side of the separator 113.

[0213] By directly arranging the active layer 122 on the separator 113, the active structure 12 can be free of 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 can also be directly arranged on the inner side of the first curved segment 1112, and can also be directly arranged on the outer side of the second curved segment 1122.

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

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

[0217] The binder can be aqueous or oily, 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 separator 113, which is conducive to the formation of the active layer 122 on the substrate 121 or the separator 113.

[0218] In this way, the active layer 122 has the performance of embedding ions, so that it can embed ions to improve the problem of ion precipitation in the corner portion 1102. Moreover, it is also conducive to the formation of the active layer 122.

[0219] It is to be noted that the active layer 122 can have a certain adhesive property by increasing the proportion of the adhesive in the active layer 122, so that the active layer 122 can be directly adhered to the first curved segment 1112, the separator 113 or the second curved segment 1122.

[0220] In some embodiments, the electrode assembly 11 further comprises a separator 113, which is laminated between the positive electrode sheet 111 and the negative electrode sheet 112. At least part of the active structure 12 is arranged between the outer side of the second curved segment 1122 and the adjacent separator 113, and is in conduction with the negative electrode sheet 112.

[0221] It can be understood that the active structure 12 comprises an active layer 122, which is arranged between the second curved segment 1122 and the separator 113 adjacent along the outer side, and is in conduction with the negative electrode sheet 112.

[0222] In this way, the active structure 12 can intercalate ions released from the first curved segment 1112 during charging of the battery monomer 10, and can also release ions and intercalate ions into the first curved segment 1112 during discharging of the battery monomer 10, so as to improve the charge and discharge capacity of the battery monomer 10.

[0223] In some embodiments, please refer to Figure 6 to Figure 10 , and combine with other drawings. Among them, Figure 10 is a partial cross-sectional view of the corner portion 1102 of the electrode assembly 11 of the battery monomer 10 and the active structure provided in some embodiments of the present application, Figure 10 , the cross section is perpendicular to the X axis (i.e. the second direction X). The active structure 12 comprises an active layer 122 for intercalating ions. At least part of the active layer 122 is arranged between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side.

[0224] As shown in Figure 10 , the active structure 12 further comprises a metal piece 124 arranged in the active layer 122, which is in conduction with the negative electrode sheet 112. Alternatively, the active layer 122 is in contact and conduction with the second curved segment 1122.

[0225] The metal piece 124 can be a copper foil, an aluminum foil, etc.

[0226] As shown in Figure 6 to Figure 9 , the metal piece 124 is arranged in the active layer 122 and is in conduction with the active layer 122.

[0227] The metal piece 124 is in conductive connection with the negative electrode tab 112. The metal piece 124 can be in conductive connection with the second flat segment 1121 of the negative electrode tab 112. The metal piece 124 can also be in conductive connection with the second curved segment 1122 of the negative electrode tab 112. As shown in Figure 10 FIG. 6, the metal piece 124 can also be in conductive connection with the negative electrode tab 1123 of the negative electrode tab 112.

[0228] The metal piece 124 and the negative electrode tab 112 can be in conductive connection by welding, bonding, or the like.

[0229] The metal piece 124 and the negative electrode tab 112 are in conductive connection, or the active layer 122 is in conductive connection with the second curved segment 1122, so that the active structure 12 can maintain the same potential as the negative electrode tab 112, expand the potential difference between the positive electrode tab 111 and the active structure 12, increase the reaction rate of ions and the active structure 12, and improve the efficiency of the ions in the first curved segment 1112 embedded in the active structure 12.

[0230] It can be understood that the active layer 122 and the negative electrode tab 112 are in conductive connection. The active layer 122 can be in conductive connection with the second flat segment 1121 of the negative electrode tab 112. The active layer 122 can also be in conductive connection with the second curved segment 1122 of the negative electrode tab 112. The active layer 122 can also be in conductive connection with the negative electrode tab 1123 of the negative electrode tab 112.

[0231] When the active layer 122 is arranged between the first curved segment 1112 and the separator 113 adjacent along the inner side, the active layer 122 can be in conductive connection with the negative electrode tab 112 through the metal piece 124. Specifically, the metal piece 124 is in conductive connection with the active layer 122. The metal piece 124 is in conductive connection with the second flat segment 1121, or the metal piece 124 is in conductive connection with the second curved segment 1122, or the metal piece 124 is in conductive connection with the negative electrode tab 1123.

[0232] When the active layer 122 is arranged between the second curved segment 1122 and the separator 113 adjacent along the outer side, the active layer 122 can be in conductive connection with the negative electrode tab 112 through the metal piece 124, or the active layer 122 can be in conductive connection with the second curved segment 1122 directly. The active layer 122 in conductive connection with the negative electrode tab 112 through the metal piece 124 has the same mode as explained in the previous paragraph, which will not be repeated here.

[0233] In some embodiments, please refer to Figure 5 FIG. 7, and in combination with other drawings. The active structure 12 is in orthographic projection on the first curved segment 1112 along the winding direction of the positive electrode tab 111.

[0234] In some embodiments, please refer to Figure 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 first direction Z, and the positive electrode tab 111 and the negative electrode tab 112 are wound around the first axis L parallel to the first direction Z.

[0235] In some embodiments, please refer to Figure 5 and Figure 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 tab 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 tab 111 and the negative electrode tab 112 are wound around the 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 that escape from the first curved segment 1112 can be better embedded, and thus the problem of ion precipitation in the corner portion 1102 can be improved.

[0237] In some embodiments, please refer to Figure 6 to Figure 9 , and in combination with other drawings. The size of the active structure 12 along the winding direction of the positive electrode tab 111 is 10mm-20mm.

[0238] As shown in Figure 6 to Figure 9 , the size of the active structure 12 along the winding direction of the positive electrode tab 111 is Figure 6 to Figure 9 , which is the first size H1 of the active structure 12 in the unfolded state, and the first size H1 is 10mm-20mm, and specifically can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, etc.

[0239] By such arrangement, the active structure 12 can better cover the inner side of the first curved segment 1112 along the winding direction of the positive electrode tab 111, so that the ions that escape from the first curved segment 1112 can be better embedded, and thus the problem of ion precipitation in the corner portion 1102 can be improved, which helps to improve the charge and discharge performance of the battery monomer 10.

[0240] In some embodiments, please refer to Figure 5 , and in combination with other drawings. The active structure 12 is in the form of a sheet, and the thickness dimension of the active structure 12 ranges from 20μm to 40μm.

[0241] The active structure 12 is in a sheet form, which means that the active structure 12 is in a sheet structure. Based on this, the active structure 12 is in a sheet structure with the positive electrode sheet 111, the negative electrode sheet 112, and the separator 113.

[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-mentioned thickness direction and are parallel to each other. The active structure 12 is in a sheet form, so that the active structure 12 can be arranged 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 dimension of the active structure 12 is the second dimension H2 as shown in Figure 5 and Figure 6 to Figure 9 The second dimension H2 can be 21 μm, 22 μm, 24 μm, 26 μm, 28 μm, 30 μm, 32 μm, 35 μm, 37 μm, 39 μm, etc.

[0244] In this way, the thickness of the active structure 12 is designed to be reasonable, on the basis of efficient embedding of the ions released by the first curved segment 1112, the thickness of the active structure 12 is small, so as to reduce the space occupied by the active structure 12 in the electrode assembly 11 as much as possible, so as to help maintain a high energy density of the battery 100.

[0245] Please refer to Figure 2 and Figure 3 The battery 100 provided by the embodiment of the present application comprises the battery monomer 10. Wherein, the battery monomer 10 in the embodiment is the same as the battery monomer 10 in the previous embodiment, please refer to the related description of the battery monomer 10 in the previous embodiment, which will not be repeated here.

[0246] The battery 100 provided by the embodiment of the present application, by adopting the battery monomer 10 related by the above embodiments, can improve the ion release problem of the battery monomer 10, and help to improve the charge-discharge cycle performance and reliability performance of the battery 100.

[0247] Please refer to Figure 1 The power consumption device provided by the embodiment of the present application comprises the battery monomer 10 or the battery 100. Wherein, the battery monomer 10 and the battery 100 in the embodiment are the same as the battery monomer 10 and the battery 100 in the previous embodiment, please refer to the related description of the battery monomer 10 and the battery 100 in the previous embodiment, which will not be repeated here.

[0248] The power utilization device provided by the embodiment of the present application is helpful to improve the charge-discharge cycle performance and reliability of the battery 100 by using the battery monomer 10 or the battery 100.

[0249] Please refer to Figure 11 , and in combination with other drawings. The embodiment of the present application also provides a processing method of the battery monomer 10, wherein the battery monomer 10 in the embodiment is the same as the battery monomer 10 in the previous embodiment, and specific details can be referred to the related description of the battery monomer 10 in the previous embodiment, which will not be repeated here. The processing method of the battery monomer 10 comprises the following steps:

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

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

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

[0253] In this step, the active structure 12 can be set on the inner side of the first bending segment 1112 to the third bending segment 1112 of the positive electrode sheet 111.

[0254] In this step, the active structure 12 can be adhered to the inner side of the first bending 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, which can enable the active structure 12 to be arranged between the first bending segment 1112 and the second bending segment 1122 adjacent to the inner side. Based on this, the problem of ion precipitation of the corner portion 1102 of the electrode assembly 11 can be improved.

[0257] It should be noted that before step S30, the negative electrode sheet 112 can also be die cut, that is, the negative electrode sheet 112 is die cut from the incoming material to obtain the negative electrode sheet 112.

[0258] The processing method of the battery monomer 10 provided by the embodiment of the present application can set the active structure 12 on the positive electrode sheet 111 after die cutting and before winding, so that the active structure 12 can be arranged between the first bending segment 1112 and the second bending segment 1122 adjacent to the inner side, so as to improve the problem of ion precipitation of the corner portion 1102 of the electrode assembly 11.

[0259] The embodiment of the present application further provides a processing method of the battery monomer 10, wherein the battery monomer 10 in the embodiment is the same as the battery monomer 10 in the previous embodiment, and specific details can be referred to the related description of the battery monomer 10 in the previous embodiment, which will not be repeated here. The processing method of the battery monomer 10 comprises the following steps:

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

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

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

[0263] In this step, the active structure 12 can be adhered to the outer side of the second bending 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, which can enable the active structure 12 to be arranged between the first bending segment 1112 and the second bending segment 1122 adjacent to the inner side. Based on this, the problem of ion precipitation of the corner portion 1102 of the electrode assembly 11 can be improved.

[0266] It should be noted that before step S60, the positive electrode sheet 111 can also be die cut, that is, the positive electrode sheet 111 is die cut to obtain the positive electrode sheet 111.

[0267] The processing method of the battery monomer 10 provided by the embodiment of the present application can set the active structure 12 on the negative electrode sheet 112 after die cutting and before winding, so that the active structure 12 can be arranged between the first bending segment 1112 and the second bending segment 1122 adjacent to the inner side, so as to improve the problem of ion precipitation of the corner portion 1102 of the electrode assembly 11.

[0268] The embodiment of the present application further provides a processing method of the battery monomer 10, wherein the battery monomer 10 in the embodiment is the same as the battery monomer 10 in the previous embodiment, and specific details can be referred to the related description of the battery monomer 10 in the previous embodiment, which will not be repeated here. The processing method of the battery monomer 10 comprises the following steps:

[0269] S70, winding the positive electrode sheet 111 and the negative electrode sheet 112, and 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 during winding the positive electrode sheet 111 and the negative electrode sheet 112.

[0270] It can be understood that the active structure 12 is set in the electrode assembly 11 during winding the electrode assembly 11, so that the active structure 12 can be set between the first curved segment 1112 and the second curved segment 1122 adjacent along the inner side. By setting in this way, the problem of ion precipitation in the corner portion 1102 of the battery assembly 11 can be improved.

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

[0272] As one of the embodiments of the present application, as shown in Figure 3 to Figure 6 The battery monomer 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 flat portion 1101 and two corner portions 1102, the two corner portions 1102 are arranged on opposite sides of the flat portion 1101. The positive electrode sheet 111 includes a first flat segment 1111 and a first curved segment 1112, the first curved segment 1112 is connected to the first flat segment 1111. The negative electrode sheet 112 includes a second flat segment 1121 and a second curved segment 1122, the second curved segment 1122 is connected to the second flat segment 1121. The separator 113 includes a third flat segment 1131 and a third curved segment 1132, the third curved segment 1132 is connected to the third flat segment 1131. The first flat segment 1111 and the second flat segment 1121 are alternately stacked, and the third flat segment 1131 is stacked between the first flat segment 1111 and the second flat segment 1121, the first flat segment 1111, the second flat segment 1121 and the third flat segment 1131 constitute the above-mentioned flat 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 arranged between the first curved segment 1112 and the separator 113 adjacent along the inner side, and is used to embed ions precipitated 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 the side of the active layer 122 away from the substrate 121, and the adhesive layer 123 is adhered to the inner side of the first curved segment 1112.

[0274] During charging of the battery 100, part of the ions released from the positive electrode tab 111 are inserted into the negative electrode tab 112, and part of the ions are inserted into the active structure 12. The active structure 12 consumes part of the ions, which can improve the problem that the ions excessively reach the second curved segment 1122 of the negative electrode tab 112 and cause ion precipitation.

[0275] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized by, The application relates to an electrode assembly, comprising: an electrode assembly comprising a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and the negative electrode sheet being arranged in a laminated and wound manner; the electrode assembly comprises a flat portion and two corner portions arranged on opposite sides of the flat portion; the positive electrode sheet comprises a first flat segment and a first curved segment connected to the first flat segment, the negative electrode sheet comprises a second flat segment and a second curved segment connected to the second flat segment, the first flat segment and the second flat segment are alternately laminated to form the flat portion, and the first curved segment and the second curved segment are alternately laminated to form the corner portion; an active structure is arranged between at least part of the first curved segment and the second curved segment adjacent to the inner side, and the active structure has an active material and is used for embedding ions. The positive electrode sheet comprises more than three first curved segments distributed at intervals in the winding direction of the positive electrode sheet; and the inner side of at least the first first curved segment to the inner side of the third first curved segment is provided with the active structure between the corresponding adjacent second curved segment in the winding direction of the positive electrode sheet. The electrode assembly further comprises a separator, and the separator is arranged between the positive electrode sheet and the negative electrode sheet in a laminated manner.

2. The battery cell of claim 1, wherein, The active structure is arranged between the first curved segment and the separator adjacent to the inner side, and / or the active structure is arranged between the second curved segment and the separator adjacent to the outer side.

3. The battery cell of claim 1, wherein, The active structure comprises a substrate and an active layer arranged on the substrate and used for embedding ions, and at least part of the substrate and at least part of the active layer are arranged between the first curved segment and the second curved segment adjacent to the inner side. The active structure further comprises an adhesive layer, and the substrate and / or the active layer is provided with the adhesive layer; the electrode assembly further comprises a separator, and the separator is arranged between the positive electrode sheet and the negative electrode sheet in a laminated manner.

4. The battery cell according to any one of claims 1 to 3, characterized in that, At least part of the active structure is arranged between the first curved segment and the separator adjacent to the inner side and is bonded to the first curved segment and / or the separator through the adhesive layer, or at least part of the active structure is arranged between the second curved segment and the separator adjacent to the outer side and is bonded to the second curved segment and / or the separator through the adhesive layer.

5. The battery cell of claim 4, wherein, The adhesive layer comprises a plurality of adhesive portions arranged at intervals on the active layer or the substrate; and the adhesive portion of a single adhesive layer is used for bonding the first curved segment, the separator or the second curved segment. The adhesive portion is arranged on one side of the active structure close to the first curved segment.

6. The battery cell of claim 5, wherein, The adhesive layer is arranged on the active layer and is bonded to the first curved segment.

7. The battery cell of claim 6, wherein, The adhesive layer is a conductive adhesive layer and is arranged closer to the first curved segment than the active layer.

8. The battery cell of claim 5, wherein, The adhesive layer and the active layer are arranged on opposite sides of the substrate, the adhesive layer is bonded to the separator, and the active layer is in contact with the first curved segment.

9. The battery cell of claim 5, wherein, ​ 10. The battery cell of claim 5, wherein, ​ 11. The battery cell of claim 4, wherein, The active layer has adhesive property; the electrode assembly further comprises a separator, the separator is stacked between the positive electrode sheet and the negative electrode sheet; a single active layer is adhered to the first curved segment, the separator or the second curved segment.

12. The battery cell of claim 4, wherein, The electrode assembly further comprises a separator, the separator is stacked between the positive electrode sheet and the negative electrode sheet; the substrate has insulating property and is arranged between the first curved segment and the separator adjacent to the inner side, the active layer is arranged on the side of the substrate away from the first curved segment and is in conduction with the negative electrode sheet.

13. The battery cell of any one of claims 1-3, wherein, The electrode assembly further comprises a separator, the separator is stacked between the positive electrode sheet and the negative electrode sheet; the active structure comprises an active layer for embedding ions, at least part 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 separator.

14. The battery cell of claim 4, wherein, The material of the active layer comprises active material, conductive agent and adhesive.

15. The battery cell of any one of claims 1-3, wherein, The electrode assembly further comprises a separator, the separator is stacked between the positive electrode sheet and the negative electrode sheet; At least part of the active structure is arranged between the second curved segment and the separator adjacent to the outer side and is in conduction with the negative electrode sheet.

16. The battery cell of any one of claims 1-3, wherein, The active structure comprises an active layer for embedding ions, at least part of the active layer is arranged between the first curved segment and the second curved segment adjacent to the inner side; The active structure further comprises a metal piece arranged on the active layer, the metal piece is in conduction with the negative electrode sheet; or, the active layer is in conduction with the second curved segment.

17. The battery cell of any one of claims 1-3, wherein, The active structure is in conduction with the negative electrode sheet. The active structure is in conduction with the negative electrode sheet.

18. The battery cell of any one of claims 1-3, wherein, The size of the active structure along the winding direction of the positive electrode sheet is 10mm-20mm.

19. The battery cell of any one of claims 1-3, wherein, The active structure is in the form of sheet material and has a thickness dimension in the range of 20μm-40μm.

20. A battery, characterized by The battery cell according to any one of claims 1-19.

21. An electrical device, comprising: The battery according to claim 20.

22. A method of processing a battery cell according to any one of claims 1-19, characterized by, The battery comprises: Die-cutting the positive electrode sheet; Arranging the active structure on the inner side of the first curved segment of the positive electrode sheet; Winding the positive electrode sheet and the negative electrode sheet.

23. A method of processing a battery cell according to any one of claims 1-19, characterized by, The battery comprises: Die-cutting the negative electrode sheet; Arranging the active structure on the outer side of the second curved segment of the negative electrode sheet; Winding the positive electrode sheet and the negative electrode sheet.

24. A method of processing a battery cell according to any one of claims 1-19, characterized by, The battery comprises: Winding the positive electrode sheet and the negative electrode sheet, and arranging the active structure 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 during the winding of the positive electrode sheet and the negative electrode sheet.

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