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

Abstract

The present application is applicable to the technical field of batteries (100), and provides a battery cell (10), a battery (100), an electrical apparatus, a combination apparatus (2100) and method, and a processing device (2000). The processing device (2000) is used for processing of batteries (100), and comprises the combination apparatus (2100). The combination method comprises: driving the combination apparatus (2100) to cause a portion of a separator (113) to be combined with and fixed to a first electrode sheet (111) and / or a second electrode sheet (112). The electrical apparatus comprises the battery (100); the battery (100) comprises the battery cell (10); the battery cell (10) comprises an electrode assembly (11); the electrode assembly (11) comprises first electrode sheets (111), second electrode sheets (112) and separators (113); the first electrode sheets (111) and the second electrode sheets (112) are alternately stacked or alternately stacked and wound; at least a portion of each separator (113) is arranged between a first electrode sheet (111) and a second electrode sheet (112), and a portion of the separator (113) is combined with and fixed to the first electrode sheet (111) and / or the second electrode sheet (112). In this way, only a portion of each separator (113) is used for the combination operation, and the remaining portion of the separator (113) is not used for the combination operation, ameliorating the problem of poor overall air permeability of the separators (113), and helping to improve the ion conductivity of the separators (113), thus improving the dynamic properties of battery cells (10).

Description

Battery cell, battery, power device, composite device and method, processing equipment

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on October 18, 2023, with application number 202311349034.7 and application name "Battery Cell, Battery, Electrical Device, Composite Device and Method, Processing Equipment", the entire contents of which are incorporated by reference into this application. Technical Field

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

[0004] In related art, a battery cell generally includes a housing and an electrode assembly disposed within the housing. The electrode assembly is primarily formed by stacking or stacking and winding a positive electrode sheet and a negative electrode sheet, with a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0005] In some cases, during the processing of battery cells, it is necessary to apply significant pressure to the positive and negative electrode sheets and the separator to facilitate the lamination operation, thereby securing the separator to the positive and negative electrode sheets. However, during the lamination process, the separator is subjected to significant pressure, which can affect its permeability and, in turn, the charge and discharge performance of the battery cell, ultimately affecting its dynamic performance.

[0006] Summary of the Invention

[0007] In view of the above problems, the purpose of the embodiments of the present application is to provide a battery cell, a battery, an electrical device, a composite device and method, and a processing equipment, which can improve the technical problem of poor air permeability of the diaphragm.

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

[0009] In a first aspect, an embodiment of the present application provides a battery cell, comprising an electrode assembly, the electrode assembly comprising a first electrode sheet, a second electrode sheet and a diaphragm, the first electrode sheet and the second electrode sheet being alternately stacked or alternately stacked and wound; at least a portion of the diaphragm is disposed between the first electrode sheet and the second electrode sheet, and a portion of the diaphragm is compositely fixed to the first electrode sheet and / or the second electrode sheet.

[0010] The battery cell provided in the embodiments of the present application is constructed by partially bonding and fixing the diaphragm to the first pole piece; or partially bonding and fixing the diaphragm to the second pole piece; or partially bonding and fixing the diaphragm to the first pole piece and the second pole piece. In this way, only a portion of the diaphragm is used for bonding, while the other portion of the diaphragm is not used for bonding. This can improve the poor overall air permeability of the diaphragm, help improve the ion conductivity of the diaphragm, and further help improve the charge and discharge performance of the battery cell, thereby improving the dynamic performance of the battery cell.

[0011] In some embodiments, the first electrode piece includes a first current collector and a first active layer arranged on the first current collector, and the second electrode piece includes a second current collector and a second active layer arranged on the second current collector; the diaphragm includes a first film material and a second film material arranged on the end side of the first film material along the first direction, the first film material is arranged opposite to the first active layer and the second active layer respectively, and the second film material is located outside the end side of the first active layer and / or the second active layer along the first direction, and is at least partially composited and fixed to the first electrode piece and / or the second electrode piece; the first direction is parallel to the first electrode piece and the second electrode piece.

[0012] In this way, the first film material has a larger proportion in the diaphragm, that is, a larger part of the diaphragm is not used for composite operation, and has better air permeability and ion conductivity, thereby improving the charge and discharge performance of the battery cell and improving the dynamic performance of the battery cell.

[0013] In some embodiments, the first active layer extends beyond the second active layer along the first direction, and the second film material is located outside an end side of the second active layer along the first direction.

[0014] In this way, the problem that ions cannot be completely embedded in the first active layer after being released from the second active layer can be improved, and the problems of ions accumulating outside the first and second active layers and puncturing the diaphragm, ion precipitation, etc. can be improved.

[0015] In some embodiments, at least a portion of the second film material is compositely fixed to a portion of the first active layer that extends beyond the second active layer along the first direction.

[0016] In this way, the composite fixation of the second film material of the diaphragm and the first pole piece is achieved, which can maintain the insulation between the diaphragm and the first pole piece and improve the problem of overlap between the first pole piece and the second pole piece caused by the diaphragm being unable to wrap the pole piece due to the folding of the diaphragm.

[0017] In some embodiments, at least one side or two opposite sides of the first active layer that extend beyond the second active layer along the first direction are compositely fixed to the second film material.

[0018] In this way, the composite operation of the second film material and the portion of the first active layer extending beyond the second active layer is very flexible.

[0019] In some embodiments, the portion of the first active layer extending beyond one end of the second active layer along the first direction is compositely fixed to the second film material; or, the portions of the first active layer extending beyond both opposite ends of the second active layer along the first direction are compositely fixed to the second film material.

[0020] In this way, the first active layer can effectively deintercalate and deintercalate ions, thereby improving the charge and discharge performance of the battery cell and the dynamic performance of the battery cell. Alternatively, the composite fixing effect of the separator on the electrode assembly can be improved.

[0021] In some embodiments, the second pole piece further includes an insulating layer disposed on the second current collector. The insulating layer is disposed on the end side of the second active layer along the first direction, extends beyond the first active layer along the first direction, and is opposite to the second film material.

[0022] In this way, the insulating layer can achieve an insulating effect between the first active layer and the second current collector, thereby improving the problem that the first active layer pierces the diaphragm and overlaps the second current collector.

[0023] In some embodiments, at least a portion of the second film material is compositely fixed to the insulating layer.

[0024] In this way, the diaphragm can effectively achieve insulation between the first pole piece and the second pole piece, thereby improving the problem of overlap between the first active layer and the second current collector, that is, improving the problem of self-discharge of the electrode assembly caused by overlap between the first pole piece and the second pole piece.

[0025] In some embodiments, at least one side or two opposite sides of a portion of the insulating layer are compositely fixed to the second film material.

[0026] In this way, at least one side or both sides of a portion of the insulating layer are compositely fixed to the second film material, making the composite operation of the second pole piece and the diaphragm very flexible.

[0027] In some embodiments, the second current collector is provided with a second tab, which is located outside one end of the second active layer along the first direction; in the first direction, the insulating layer is located between the second active layer and the second tab.

[0028] In this way, the insulating layer can achieve insulation between the first active layer and the second current collector, and can improve the problem that the end of the first active layer along the first direction pierces the second film material and overlaps the second current collector.

[0029] In some embodiments, the first current collector is provided with a first pole tab, which is arranged at one end of the first active layer along the first direction, and the second current collector is provided with a second pole tab; the second pole tab is located at one end of the second active layer along the first direction close to the first pole tab, or the second pole tab is located at one end of the second active layer along the first direction away from the first pole tab.

[0030] In this way, the insulating layer can be located at one end of the second current collector close to or away from the first electrode tab along the first direction to achieve insulation between the second current collector and the first active layer, improving the problem of the end of the first active layer piercing the diaphragm and overlapping the second current collector.

[0031] In some embodiments, at least one side of a portion of the second film material is compositely fixed to the first pole piece or the second pole piece;

[0032] And / or, at least two opposite sides of a portion of the second film material are respectively compositely fixed to the first pole piece and the second pole piece.

[0033] Such an arrangement makes the composite operation of the second film material on the electrode assembly very flexible.

[0034] In some embodiments, the second film material is provided at both opposite ends of the first film material along the first direction, and the second film material at each end of the first film material along the first direction is compositely fixed to the first pole piece and / or the second pole piece.

[0035] In this way, the problem of the diaphragm being unable to wrap the electrode piece due to folding, which causes the first electrode piece and the second electrode piece to overlap and lead to self-discharge of the electrode assembly can be improved, and the insulation effect of the diaphragm on the first electrode piece and the second electrode piece can be better maintained.

[0036] In some embodiments, the second film material is compounded with the first electrode to form a first composite structure; the first composite structures at each end of the first electrode in the first direction are arranged at intervals or continuously, or the first electrode forms two groups of first composite structures spaced apart along the first direction, wherein one group of first composite structures is arranged at intervals and the other group of first composite structures is arranged continuously.

[0037] By adopting the above technical solution, the composite operation of the first pole piece and the second film material is made very flexible.

[0038] In some embodiments, the second film material and the second pole piece are combined to form a second composite structure, and the second composite structure is arranged at intervals or continuously.

[0039] By adopting the above technical solution, the composite operation of the second pole piece and the second film material is made very flexible.

[0040] In some embodiments, the diaphragm includes a substrate and adhesive layers disposed on opposite sides of the substrate, and the diaphragm is bonded to the first pole piece and / or the second pole piece via the adhesive layers to be compositely fixed to the first pole piece and / or the second pole piece;

[0041] And / or, the electrode assembly further includes a first adhesive layer provided on the diaphragm, and the diaphragm is bonded to the first electrode piece and / or the second electrode piece via the first adhesive layer to be compositely fixed to the first electrode piece and / or the second electrode piece;

[0042] And / or, the electrode assembly further includes a second adhesive layer provided on the first electrode piece, and the first electrode piece is bonded to the diaphragm via the second adhesive layer so as to be compositely fixed to the diaphragm;

[0043] And / or, the electrode assembly further includes a third adhesive layer provided on the second electrode piece, and the second electrode piece is bonded to the diaphragm via the third adhesive layer so as to be compositely fixed to the diaphragm.

[0044] By adopting the above technical solution, during the composite operation, the diaphragm can achieve composite fixation effect by bonding.

[0045] In some embodiments, the first electrode sheet and the second electrode sheet are stacked and wound, and the electrode assembly is flat or cylindrical.

[0046] In this way, the adhesive layer on the diaphragm can provide an appropriate buffer between the first pole piece and the second pole piece, thereby improving the problem of the first pole piece and / or the second pole piece being broken during the charge and discharge process of the battery cell.

[0047] In a second aspect, an embodiment of the present application provides a battery comprising a battery cell.

[0048] The battery provided in the embodiment of the present application adopts the battery cell involved above, so that only a part of the diaphragm is used for the composite operation, and the other parts of the diaphragm are not used for the composite operation. This can improve the problem of poor overall air permeability of the diaphragm, help improve the ion conductivity of the diaphragm, and further help improve the charge and discharge performance of the battery cell, thereby improving the dynamic performance of the battery cell.

[0049] In a third aspect, an embodiment of the present application provides an electrical device including a battery cell or a battery.

[0050] The electrical device provided in the embodiment of the present application, by adopting the battery cells or batteries involved above, helps to improve the charge and discharge performance of the battery cells, thereby improving the dynamic performance of the battery cells, and thus improving the reliability of the electrical device.

[0051] In a fourth aspect, an embodiment of the present application provides a composite device, which is applied to a battery cell; the composite device is used to composite and fix part of the diaphragm to the first pole piece and / or the second pole piece.

[0052] The composite device provided in the embodiment of the present application is used to composite and fix part of the diaphragm to the first pole piece and / or the second pole piece, so that only a part of the diaphragm is used for the composite operation, and the other parts of the diaphragm are not used for the composite operation. This can improve the problem of poor overall air permeability of the diaphragm, help improve the ion conductivity of the diaphragm, and further help improve the charge and discharge performance of the battery cell, thereby improving the dynamic performance of the battery cell.

[0053] In some embodiments, the compound device includes a compound mechanism for performing compound operations; the number of the compound mechanism is one, or the number of the compound mechanism is multiple, and the multiple compound mechanisms are used to perform the compound operations in sequence.

[0054] By adopting the above technical solution, the number of composite mechanisms can be selected according to the required composite fixing effect, thereby making the composite operation very flexible.

[0055] In some embodiments, the composite mechanism includes a first composite roller and a second composite roller, the first composite roller includes a first rotating roller and a first protrusion arranged on the outer peripheral side of the first rotating roller, the first protrusion and the second composite roller are used to cooperate in performing a rolling composite operation, the first protrusion and the second composite roller are spaced to form a rolling gap, and the first protrusion and the first rotating roller define a first avoidance space connected to the rolling gap.

[0056] In this way, part of the diaphragm is not used for the composite operation, thereby improving the problem of poor overall air permeability of the diaphragm, helping to improve the ion conductivity of the diaphragm, and further helping to improve the charge and discharge performance of the battery cell, thereby improving the dynamic performance of the battery cell.

[0057] In some embodiments, the second composite roller includes a second rotating roller and a second protrusion arranged on the outer periphery of the second rotating roller. The second protrusion is arranged opposite to the first protrusion and is separated to form a rolling gap; the second protrusion and the second rotating roller define a second avoidance space connected to the rolling gap.

[0058] In this way, parts of the membrane can be left unused for the compounding operation.

[0059] In some embodiments, the first protrusions are continuously arranged along the circumferential direction on the outer peripheral side of the first rotating roller; or, the first protrusions are arranged at intervals along the circumferential direction on the outer peripheral side of the first rotating roller; or, the first rotating roller is provided with two groups of first protrusions spaced apart along the first direction, wherein one group of first protrusions is continuously arranged along the circumferential direction on the outer peripheral side of the first rotating roller, and the other group of first protrusions is arranged at intervals along the circumferential direction on the outer peripheral side of the first rotating roller.

[0060] Such an arrangement can make the first composite structure formed after the composite operation be arranged continuously or at intervals, and can also make the second composite structure formed after the composite operation be arranged continuously or at intervals, thereby making the composite effect very flexible.

[0061] In some embodiments, the second protrusions are continuously arranged along the circumferential direction on the outer peripheral side of the second rotating roller; or, the second protrusions are arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller; or, the second rotating roller is provided with two groups of second protrusions spaced apart along the first direction, wherein one group of second protrusions is continuously arranged along the circumferential direction on the outer peripheral side of the second rotating roller, and the other group of second protrusions are arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller.

[0062] Such an arrangement can make the first composite structure formed after the composite operation be arranged continuously or at intervals, and can also make the second composite structure formed after the composite operation be arranged continuously or at intervals, thereby making the composite effect very flexible.

[0063] In a fifth aspect, an embodiment of the present application provides a processing device including a composite device.

[0064] The processing equipment provided in the embodiment of the present application, by adopting the composite device involved above, helps to improve the charge and discharge performance of the battery, thereby improving the dynamic performance of the battery.

[0065] In some embodiments, the processing equipment further comprises:

[0066] The winding device is used to wind the first pole piece, the second pole piece and the diaphragm to form an electrode assembly.

[0067] With such arrangement, an electrode assembly can be obtained by winding.

[0068] In some embodiments, the processing equipment further includes a shaping device for shaping the electrode assembly into a flat shape.

[0069] With such an arrangement, a flat electrode assembly can be obtained.

[0070] In some embodiments, the processing equipment further comprises:

[0071] An assembly device for assembling the electrode assembly to form a battery cell;

[0072] A stacking device is used to stack battery cells to form a battery.

[0073] With this arrangement, a battery can be obtained.

[0074] In a sixth aspect, an embodiment of the present application provides a composite method, using a composite device, including:

[0075] The driving compound device composites and fixes a portion of the diaphragm to the first pole piece and / or the second pole piece.

[0076] The composite method provided in the embodiment of the present application, by adopting the composite device involved above, can only perform composite operations on one part of the diaphragm, so that the other parts of the diaphragm are not used for composite operations. This can improve the problem of poor overall air permeability of the diaphragm, help improve the ion conductivity of the diaphragm, and further help improve the charge and discharge performance of the battery cell, thereby improving the dynamic performance of the battery cell.

[0077] In some embodiments, driving the composite device to composite and fix a portion of the diaphragm to the first pole piece and / or the second pole piece includes:

[0078] The first composite roller and / or the second composite roller are driven to rotate, so that the first protrusion on the first composite roller cooperates with the second composite roller to roll at least one of the first electrode piece and the second electrode piece and the diaphragm.

[0079] Such arrangement enables the composite device to perform a rolling operation through the cooperation of the first composite roller and the second composite roller, thereby making the other parts of the diaphragm not used for the composite operation.

[0080] In some embodiments, before the driving and combining device combines a portion of the diaphragm with the first pole piece and / or the second pole piece, the driving and combining device further comprises:

[0081] A first adhesive layer is provided on the diaphragm, and / or a second adhesive layer is provided on the first pole piece, and / or a third adhesive layer is provided on the second pole piece.

[0082] In this way, the diaphragm can achieve a more reliable composite fixing effect.

[0083] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0085] FIG1 is a schematic diagram of a vehicle provided in some embodiments of the present application;

[0086] FIG2 is an exploded schematic diagram of a battery provided in some embodiments of the present application;

[0087] FIG3 is a front view of an electrode assembly of a battery cell provided in some embodiments of the present application;

[0088] FIG4 is a top view of FIG3;

[0089] FIG5 is a schematic diagram of an electrode assembly of a battery cell provided in some other embodiments of the present application;

[0090] FIG6 is a cross-sectional view along AA in FIG5 ;

[0091] FIG7 is a cross-sectional view along line BB in FIG3 ;

[0092] FIG8 is a schematic diagram of the first separator, the first electrode sheet, the second separator, and the second electrode sheet of the electrode assembly shown in FIG3 after being stacked and before being wound;

[0093] FIG9 is a cross-sectional view taken along CC in FIG8 ;

[0094] FIG10 is a schematic diagram of the structure shown in FIG9 under another embodiment;

[0095] FIG11 is a schematic diagram of the structure shown in FIG9 under yet another embodiment;

[0096] FIG12 is a partial schematic diagram of processing equipment provided by some embodiments of the present application;

[0097] FIG13 is a schematic diagram of the electrode assembly obtained in FIG12;

[0098] FIG14 is a schematic diagram of the shaping device of the processing equipment shown in FIG12 processing the electrode assembly;

[0099] FIG15 is a schematic diagram of the electrode assembly obtained in FIG14;

[0100] FIG16 is a schematic diagram of the structure shown in FIG9 under yet another embodiment;

[0101] FIG17 is a schematic diagram of the structure shown in FIG9 under yet another embodiment;

[0102] FIG18 is a schematic diagram of the first electrode sheet and the separator of the electrode assembly shown in FIG3 after being stacked and before being wound;

[0103] FIG19 is a schematic diagram of the structure shown in FIG18 under another embodiment;

[0104] FIG20 is a schematic diagram of the structure shown in FIG18 under yet another embodiment;

[0105] FIG21 is a schematic diagram of the second electrode sheet and the separator of the electrode assembly shown in FIG3 after being stacked and before being wound;

[0106] FIG22 is a schematic diagram of the structure shown in FIG3 under another embodiment;

[0107] FIG23 is a schematic diagram of a composite device provided by some embodiments of the present application;

[0108] FIG24 is a schematic diagram of a composite mechanism of a composite device provided in some embodiments of the present application;

[0109] FIG25 is a cross-sectional view of a composite structure of a composite device provided in some embodiments of the present application;

[0110] FIG26 is a cross-sectional view of a composite structure of a composite device provided in some other embodiments of the present application;

[0111] FIG27 is a schematic diagram of processing equipment provided by some embodiments of the present application;

[0112] FIG28 is a flow chart of a composite method provided in some embodiments of the present application.

[0113] In the figures, the following reference numerals are used: 1000 - vehicle; 100 - battery; 200 - controller; 300 - motor; 10 - battery cell; 20 - housing; 201 - storage space; 21 - first portion; 22 - second portion; 11 - electrode assembly; 111 - first pole piece; 1111 - first current collector; 11111 - first pole tab; 1112 - first active layer; 112 - second pole piece; 1121 - second current collector; 11211 - second pole tab; 1122 - second active layer; 1123 - insulating layer; 113 - diaphragm; 113a - First diaphragm; 113b-second diaphragm; 1131-first film material; 1132-second film material; 1133-substrate; 1134-adhesive layer; 12-first adhesive layer; a-first composite structure; b-second composite structure; m-straight part; n-curved part; 2000-processing equipment; 2001-composite gap; 2002-first avoidance space; 2003-second avoidance space; 2100-composite device; 2110-composite mechanism; 2111-first composite roller; 21111-first rotating roller; 21112-first convex portion; 2112-second composite roller; 21121-second rotating roller; 21122-second convex portion; 2200-winding device; 2300-shaping device; 2400-assembling device; 2500-stacking device; Z-first direction; X-second direction. DETAILED DESCRIPTION

[0114] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0115] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0116] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0117] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0118] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0119] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0120] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0121] In related art, a battery cell typically includes a housing and an electrode assembly disposed within the housing. The electrode assembly is the component within the battery cell where the electrochemical reaction occurs. The electrode assembly is primarily composed of a stacked or wound positive and negative electrode sheets, with a separator disposed between the positive and negative electrode sheets. The separator is an insulating structure with insulating properties, used to insulate the positive and negative electrode sheets, thereby reducing the problem of self-discharge of the electrode assembly caused by overlapping the positive and negative electrode sheets.

[0122] In some cases, during the processing of battery cells, it is necessary to apply high pressure to the positive and negative electrode sheets and the separator by means of, but not limited to, rolling, in order to perform the lamination operation so that the separator is integrally laminated and fixed to the positive and negative electrode sheets. This maintains the position of the separator on the positive and negative electrode sheets, thereby maintaining the separator's insulating effect on the positive and negative electrode sheets.

[0123] However, during the process of applying significant pressure to the positive and negative electrode sheets, and the separator, by means of, but not limited to, rolling, to secure the separator to the positive and negative electrode sheets, the separator as a whole is subjected to significant pressure, which deteriorates its air permeability and ion conductivity. This makes it difficult for ions in the electrolyte to pass through the separator and, consequently, to be intercalated and deintercalated between the positive and negative electrode sheets. Consequently, during the composite operation, the permeability of the separator is affected, which in turn affects the charge and discharge performance of the battery cell, thereby affecting the kinetic performance of the battery cell.

[0124] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, an electrical device, a composite device, a method, and processing equipment. By compositely fixing a portion of the diaphragm to the first pole piece, or compositely fixing a portion of the diaphragm to the second pole piece, or compositely fixing a portion of the diaphragm to the first pole piece and the second pole piece, only a portion of the diaphragm is used for the composite operation, while the remaining portion of the diaphragm is not used for the composite operation. This can improve the poor overall air permeability of the diaphragm, help improve the ion conductivity of the diaphragm, and further help improve the charge and discharge performance of the battery cell, thereby improving the dynamic performance of the battery cell.

[0125] It should be noted that the composite device and method refer to a composite device and a composite method.

[0126] In some embodiments, the battery cells and batteries involved in the embodiments of the present application can be used in electrical devices that use the battery cells or batteries as a power source.

[0127] The electrical devices involved in the embodiments of the present application may be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like. According to the drive mode, vehicles may be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0128] In other embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, such as energy storage containers, energy storage cabinets, and the like.

[0129] The battery involved in the embodiments of the present application can be a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or in hybrid mode through a busbar. Hybrid mode refers to the multiple battery cells being connected in both series and parallel mode.

[0130] In some embodiments, the battery may be a battery module. When multiple battery cells are present, the multiple battery cells are arranged and secured to form a battery module. For example, the multiple battery cells may be secured to form a battery module using cable ties or other similar means. For example, the multiple battery cells may also be secured to form a battery module using end plates, side plates, or other similar means.

[0131] In other embodiments, the battery may be a battery pack, which may include a housing and battery cells. As an example, the battery cells may be directly housed in the housing. As an example, the battery cells may be first formed into a battery module and then housed in the housing.

[0132] The battery cells referred to in the embodiments of this application are the smallest units that store and output electrical energy. These cells can be secondary batteries or primary batteries. They can be, but are not limited to, metal batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries. They can be cylindrical, flat, rectangular, or other shapes.

[0133] For ease of description, the embodiments of the present application are described using a vehicle as an example of an electrical device.

[0134] In some embodiments, please refer to FIG1 , which is a schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The interior of the vehicle 1000 is provided with the above-mentioned battery 100, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0135] In some embodiments, the battery 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0136] In some embodiments, please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a plurality of battery cells 10. The housing 20 has a structure with a storage space 201 therein and can adopt a variety of structures. In some embodiments, the housing 20 can include a first portion 21 and a second portion 22, which overlap each other and together define the storage space 201.

[0137] 2 , the first portion 21 may be a hollow structure with an opening at one end, and the second portion 22 may be a plate-like structure. The second portion 22 covers the open side of the first portion 21, so that the first portion 21 and the second portion 22 jointly define the aforementioned accommodation space 201. Alternatively, the first portion 21 and the second portion 22 may both be hollow structures with an opening at one end, with the open side of the first portion 21 covering the open side of the second portion 22, so that the first portion 21 and the second portion 22 jointly define the aforementioned accommodation space 201.

[0138] The box body 20 composed of the first part 21 and the second part 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0139] In some embodiments, referring to FIG. 2 , multiple battery cells 10 may be connected in series, in parallel, or in a hybrid manner to form a whole, which is then directly housed in the aforementioned accommodation space 201 of the housing 20. In other embodiments, multiple battery cells 10 may also be first connected in series, in parallel, or in a hybrid manner, and then arranged and fixed to form multiple battery modules, which are then further connected in series, in parallel, or in a hybrid manner to form a whole, which is then housed in the aforementioned accommodation space 201 of the housing 20.

[0140] In some embodiments, the housing 20 of the battery 100 may serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 may form at least a portion of the chassis of the vehicle 1000, or a portion of the housing 20 may form at least a portion of a cross member or a longitudinal member of the vehicle 1000.

[0141] In some embodiments, please refer to Figures 3 to 5 together, and in combination with other drawings. Figure 3 is a front view of the electrode assembly 11 of the battery cell 10 provided in some embodiments of the present application, and Figure 4 is a top view of the electrode assembly 11 of the battery cell 10 provided in some embodiments of the present application. Among them, Figure 4 is specifically a schematic diagram of the electrode assembly 11 from the perspective of the first direction Z involved below, and the first composite structure and the second composite structure are not shown in Figure 4. In Figures 3 and 4, the electrode assembly 11 is mainly composed of positive electrode sheets and negative electrode sheets stacked and wound, which is the winding body involved below. Figure 5 is a schematic diagram of the electrode assembly 11 of the battery cell 10 provided in other embodiments of the present application. In Figure 5, the positive electrode sheets and negative electrode sheets of the electrode assembly 11 are indicated by dotted lines. In Figure 5, the electrode assembly 11 is mainly composed of positive electrode sheets and negative electrode sheets stacked and arranged, which is the winding body involved below.

[0142] The battery cell 10 may include an electrode assembly 11 and a case.

[0143] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator 113 is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 11, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the electrode ear. The ear of the positive electrode sheet is the positive electrode ear, and the ear of the negative electrode sheet is the negative electrode ear. The positive electrode ear and the negative electrode ear can be located together at one end of the main body or respectively at opposite ends of the main body. The separator 113 is an insulating structure with insulating properties, which is used to achieve insulation between the positive electrode sheet and the negative electrode sheet to improve the problem of self-discharge of the electrode assembly 11 caused by overlapping of the positive electrode sheet and the negative electrode sheet.

[0144] In the battery cell 10 , the shape of the electrode assembly 11 can be cylindrical, square, flat, etc.

[0145] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0146] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0147] In some embodiments, the battery cell 10 may further include an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. During the movement of ions between the positive and negative electrodes, the ions must pass through the separator 113 between the positive and negative electrodes. The electrolytes used in the embodiments of the present application may be liquid, gel, or solid.

[0148] In some embodiments, the housing may include a shell and an end cap, which are components for jointly defining the internal environment of the battery cell 10, and the internal environment defined by the shell and the end cap is used to accommodate the electrode assembly 11 and the electrolyte. The shell and the end cap may be independent components. Specifically, the shell has an opening, and the end cap is provided at the opening of the shell to jointly define the internal environment of the battery cell 10 with the shell, and to isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell and the end cap may be an integrated structure. Specifically, a common connection surface may be formed between the end cap and the shell before the electrode assembly 11 is placed in the shell. After the electrode assembly 11 is placed in the shell, when the electrode assembly 11 needs to be encapsulated, the end cap is closed over the shell.

[0149] The number of the end caps may be one, or two, which are respectively arranged at opposite ends of the housing.

[0150] The shell may be cylindrical, square, or other shapes, depending on the shape and size of the electrode assembly 11. Furthermore, the shell and end caps may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0151] Please refer to Figures 3 to 9 together with other accompanying drawings. Figure 6 is a cross-sectional view along AA in Figure 5, and some structures on both sides are omitted by ellipsis in Figure 6. Figure 7 is a cross-sectional view along BB in Figure 3, and some structures on both sides are omitted by ellipsis in Figure 7. Figure 8 is a schematic diagram of the first diaphragm 113a, the first pole piece 111, the second diaphragm 113b and the second pole piece 112 of the electrode assembly 11 of the battery 100 monomer provided in Figure 3 after stacking and before winding, and Figure 9 is a schematic diagram along CC in Figure 8. The battery 100 monomer provided in an embodiment of the present application includes an electrode assembly 11, and the electrode assembly 11 includes a first pole piece 111, a second pole piece 112 and a diaphragm 113. In some possible designs, as shown in Figures 5 and 6 , the first electrode sheet 111 and the second electrode sheet 112 are alternately stacked. Alternatively, in other possible designs, as shown in Figures 3 , 4 , 7 , and 9 , the first electrode sheet 111 and the second electrode sheet 112 are alternately stacked and wound. At least a portion of the diaphragm 113 is disposed between the first electrode sheet 111 and the second electrode sheet 112. Furthermore, a portion of the diaphragm 113 is compositely fixed to the first electrode sheet 111 and / or the second electrode sheet 112.

[0152] The first electrode 111 is a positive electrode, and the second electrode 112 is a negative electrode. Alternatively, the first electrode 111 is a negative electrode, and the second electrode 112 is a positive electrode.

[0153] It should be noted that the electrode assembly 11 includes a first electrode piece 111 , a second electrode piece 112 and a diaphragm 113 , which means that the electrode assembly 11 includes at least one first electrode piece 111 , at least one second electrode piece 112 and at least one diaphragm 113 .

[0154] When the number of the first pole piece 111 and the second pole piece 112 is one, the first pole piece 111 and the second pole piece 112 are alternately stacked, which means that the first pole piece 111 and the second pole piece 112 are stacked in sequence. As an example, in Figures 8 and 9, the number of the first pole piece 111 and the second pole piece 112 are both one. When the number of the first pole piece 111 and the second pole piece 112 are both multiple, the first pole piece 111 and the second pole piece 112 are alternately stacked, which means that the stacking order of the first pole piece 111 and the second pole piece 112 is the first pole piece 111, the second pole piece 112, the first pole piece 111... and so on. As an example, in Figures 5 and 6, the number of the first pole piece 111 and the second pole piece 112 are both multiple.

[0155] For ease of description, the electrode assembly 11 formed by alternately stacking the first electrode sheet 111 and the second electrode sheet 112 is named a stack, and the electrode assembly 11 formed by stacking and winding the first electrode sheet 111 and the second electrode sheet 112 is named a winding.

[0156] When the electrode assembly 11 is a stacked body, the number of separators 113 can be set to one, and the separator 113 is bent during the process of alternating stacking of the first electrode sheet 111 and the second electrode sheet 112, so that at least a portion of the separator 113 is stacked between the first electrode sheet 111 and the second electrode sheet 112. Alternatively, the number of separators 113 can be set to multiple, and at least one separator 113 is stacked between the first electrode sheet 111 and the second electrode sheet 112.

[0157] When the electrode assembly 11 is a wound body, the number of separators 113 is generally the same as the number of electrode sheets (including the first electrode sheet 111 and the second electrode sheet 112), and the separators 113 and the electrode sheets are stacked and wound in the order of separator 113, electrode sheet, and separator 113. Taking the case where the number of first electrode sheets 111 and the number of second electrode sheets 112 are both one as an example, as shown in Figures 3, 4, and 7 to 9, there are two separators 113, and the two separators 113 are respectively a first separator 113a and a second separator 113b. The first separator 113a, the first electrode sheet 111, the second separator 113b, and the second electrode sheet 112 are alternately stacked and wound.

[0158] Based on this, a diaphragm 113 is provided between the first electrode piece 111 and the second electrode piece 112 to achieve insulation between the first electrode piece 111 and the second electrode piece 112 and improve the problem of self-discharge caused by the overlap of the first electrode piece 111 and the second electrode piece 112.

[0159] In some possible designs, the diaphragm 113 is only provided between the first electrode sheet 111 and the second electrode sheet 112 to achieve insulation between the first electrode sheet 111 and the second electrode sheet 112, thereby improving the problem of self-discharge caused by the overlap of the first electrode sheet 111 and the second electrode sheet 112. Alternatively, in other possible designs, a portion of the diaphragm 113 is provided between the first electrode sheet 111 and the second electrode sheet 112, and another portion of the diaphragm 113 can be provided at the outermost side of the overall structure formed by the first electrode sheet 111 and the second electrode sheet 112, so that the outer peripheral side of the electrode assembly 11 has the diaphragm 113, thereby improving the problem of overlap and conduction between the electrode assembly 11 and the external structure. As an example, the electrode assembly 11 is a stack, and along the stacking direction of the first electrode sheet 111 and the second electrode sheet 112, the diaphragm 113 is provided on both opposite sides of the electrode assembly 11. As another example, as shown in FIG4 , the electrode assembly 11 is a wound body, and the electrode assembly 11 is terminated with the diaphragm 113 after winding.

[0160] Partial composite fixation of the diaphragm 113 to the first pole piece 111 and / or the second pole piece 112 means that only a portion of the diaphragm 113 is used for composite operation, and the other portion of the diaphragm 113 is not used for composite operation. Please refer to Figures 9 to 11 together. Figure 10 is a schematic diagram of the structure shown in Figure 9 under another embodiment, and Figure 11 is a schematic diagram of the structure shown in Figure 9 under yet another embodiment. It can be understood that in some possible designs, as shown in Figure 10, the diaphragm 113 is only partially composite fixed to the first pole piece 111, but not composite fixed to the second pole piece 112; or, in other possible designs, as shown in Figure 10, the diaphragm 113 is only partially composite fixed to the second pole piece 112, but not composite fixed to the first pole piece 111; or, in yet other possible designs, as shown in Figure 9, the diaphragm 113 is partially composite fixed to both the first pole piece 111 and the second pole piece 112.

[0161] Part of the diaphragm 113 is compositely fixed to the first electrode piece 111 and the second electrode piece 112, which means that part of the diaphragm 113 is compositely fixed to the first electrode piece 111, and part of the diaphragm 113 is compositely fixed to the second electrode piece 112. In addition, the rest of the diaphragm 113 is not compositely fixed to the first electrode piece 111 or the second electrode piece 112. As an example, as shown in Figure 9, part of the first diaphragm 113a is compositely fixed to the first electrode piece 111, and part of the second diaphragm 113b is compositely fixed to the first electrode piece 111 and the second electrode piece 112.

[0162] The battery 100 provided in the embodiments of the present application is constructed by partially bonding and fixing the diaphragm 113 to the first electrode 111; or, alternatively, bonding and fixing the diaphragm 113 to the second electrode 112; or, alternatively, bonding and fixing the diaphragm 113 to the first electrode 111 and the second electrode 112. In this way, only a portion of the diaphragm 113 is used for bonding, while the remaining portion of the diaphragm 113 is not used for bonding. This can improve the poor overall air permeability of the diaphragm 113, help enhance the ion conductivity of the diaphragm 113, and further help improve the charge and discharge performance of the battery 100, thereby enhancing the dynamic performance of the battery 100.

[0163] Please refer to Figures 12 to 15 in conjunction with the other accompanying drawings. Figure 12 is a partial schematic diagram of a processing apparatus 2000 provided in some embodiments of the present application, Figure 13 is an electrode assembly 11 obtained in Figure 12, Figure 14 is a schematic diagram of a shaping device 2300 of the processing apparatus 2000 provided in some embodiments of the present application shaping the electrode assembly 11 obtained in Figure 13, and Figure 15 is an electrode assembly 11 obtained in Figure 14. In Figures 13 to 15, the electrode assembly 11 is only briefly illustrated, that is, the structure of the diaphragm 113 is simply illustrated.

[0164] It is important to note that, as discussed in conjunction with Figures 13 to 15 and other accompanying drawings, the diaphragm 113 generally comprises a substrate 1133 and an adhesive layer 1134. Adhesive layers 1134 are provided on opposite sides of the substrate 1133. Adhesive layers 1134 possess adhesive properties, enabling the diaphragm 113 to be bonded.

[0165] For the electrode assembly 11 that is a wound body, as shown in FIG12 , the first electrode sheet 111 , the separator 113 , and the second electrode sheet 112 are generally stacked and composited first, and then wound to form the electrode assembly 11 .

[0166] In some related technologies, during the composite operation, the diaphragm 113 is subjected to greater pressure, causing the adhesive layer 1134 to be squeezed and deformed, and the structure to change and lose its adhesive ability. However, in the battery 100 monomer provided in the embodiment of the present application, only a portion of the diaphragm 113 is subjected to the composite operation, and the other portions are not subjected to the composite operation, so that the adhesive ability of the adhesive layer 1134 of the other portions of the diaphragm 113 can be retained. In this way, after the first electrode 111, the diaphragm 113 and the second electrode 112 are stacked and wound, the diaphragm 113 can be bonded to the first electrode 111 and the second electrode 112 through the adhesive layer 1134, which can improve the integrity of the electrode assembly 11 formed by winding, improve the problem of the electrode assembly 11 formed by winding being scattered, and thus improve the quality of the battery 100 monomer.

[0167] It should also be noted that the adhesive layer 1134 has a certain thickness, so that the entire diaphragm 113 has a certain thickness accordingly.

[0168] In other related technologies, after the diaphragm 113 is integrally fixed to the first pole piece 111 and the second pole piece 112, the diaphragm 113 as a whole will be subjected to greater pressure, causing the adhesive layer 1134 to be flattened and deformed, thereby making the overall thickness of the diaphragm 113 very small. Based on this, after the first pole piece 111, the diaphragm 113 and the second pole piece 112 are stacked and wound, since the overall thickness of the diaphragm 113 is very small, the distance between the first pole piece 111 and the second pole piece 112 is also smaller. During the charge and discharge process of the battery 100 single cell, the first pole piece 111 and the second pole piece 112 will expand, making the first pole piece 111 and the second pole piece 112 located on the outside of the electrode assembly 11 prone to breakage, thereby causing safety issues such as lithium deposition and overlap of the first pole piece 111 and the second pole piece 112. In the battery cell 100 provided in the embodiment of the present application, only a portion of the diaphragm 113 undergoes the composite operation, while the other portions do not. This prevents the adhesive layer 1134 of the portion of the diaphragm 113 that does not undergo the composite operation from being flattened and deformed. The portion of the diaphragm 113 that does not undergo the composite operation has a greater thickness, which can provide a larger buffer space for the expansion of the first electrode sheet 111 and the second electrode sheet 112. In this way, after the first electrode sheet 111, the diaphragm 113, and the second electrode sheet 112 are stacked and wound, a larger distance exists between the first electrode sheet 111 and the second electrode sheet 112 on opposite sides of the portion of the diaphragm 113 that does not undergo the composite operation. During the charge and discharge process of the battery cell 100, the first electrode sheet 111 and the second electrode sheet 112 can expand and squeeze the diaphragm 113 that does not undergo the composite operation. In other words, a certain buffer is provided by the diaphragm 113 that does not undergo the composite operation, thereby improving the problem of the first electrode sheet 111 and the second electrode sheet 112 expanding and fracturing during the charge and discharge process. It can be understood that only a portion of the separator 113 is composited, so that the adhesive layer 1134 of the separator 113 has the ability to provide a buffer gap for the charge and discharge of the electrode assembly 11 .

[0169] For some electrode assemblies 11 that are wound bodies, as shown in Figures 4, 12 to 15, and in combination with other figures. In Figures 4 and 15, the electrode assembly 11 is divided into a straight part m and a curved part n by dotted lines. After the first pole piece 111 and the second pole piece 112 are stacked and wound, they need to be shaped by a shaping device 2300 to obtain the electrode assembly 11. In particular, the electrode assembly 11 is flat and includes a straight part m and two curved parts n. The first pole piece 111, the second pole piece 112 and the diaphragm 113 of the straight part m are all arranged to extend straight, and the first pole piece 111, the second pole piece 112 and the diaphragm 113 of the curved part n are all arranged to extend bent, and the two curved parts n are respectively arranged at the opposite ends of the straight part m along the second direction X. In some other related technologies, after the diaphragm 113 is integrally composited and fixed to the first pole piece 111 and the second pole piece 112, the diaphragm 113 as a whole will be subjected to greater pressure, causing the adhesive layer 1134 to be flattened and deformed, thereby making the overall thickness of the diaphragm 113 very small. Based on this, the distance between the first pole piece 111 and the second pole piece 112 is very small. During the charge and discharge process of the battery 100, the first pole piece 111 and the second pole piece 112 will expand, making the first pole piece 111 and the second pole piece 112 located at the curved portion n prone to fracture during the expansion process, thereby causing safety issues such as lithium deposition and overlap of the first pole piece 111 and the second pole piece 112. In the battery 100 provided in the embodiment of the present application, only a portion of the diaphragm 113 is composited, and the other portions are not composited, so that the adhesive layer 1134 of the portion of the diaphragm 113 that is not composited is not flattened and deformed, and the portion of the diaphragm 113 that is not composited has a greater thickness. Thus, during the shaping process, the straight portion m of the electrode assembly 11 is subjected to a greater shaping pressure, allowing the adhesive layer 1134 of the separator 113 located in the straight portion m to fill as much as possible into the curved portion n, thereby forming a larger gap between the first electrode piece 111 and the second electrode piece 112 in the curved portion n. This provides expansion space for the first electrode piece 111 and the second electrode piece 112 in the curved portion n, thereby improving the problem of expansion and fracture of the first electrode piece 111 and the second electrode piece 112 during the charge and discharge process. It can be understood that only a portion of the separator 113 is subjected to the composite operation, so that the adhesive layer 1134 of the separator 113 has the ability to provide a buffer gap for the charge and discharge of the electrode assembly 11.

[0170] The second direction X is parallel to the X-axis shown in Figures 3 and 4 , and the first direction Z referred to below is parallel to the Z-axis. Figures 3 and 4 also show the Y-axis. The X-axis and the Z-axis are perpendicular, the X-axis and the Y-axis are perpendicular, and the Y-axis and the Z-axis are perpendicular. In other words, the first direction Z is perpendicular to the second direction X.

[0171] In some embodiments, please refer to Figures 5 to 11 together, and in conjunction with other figures. The first electrode 111 includes a first current collector 1111 and a first active layer 1112, and the first active layer 1112 is disposed on the first current collector 1111. The second electrode 112 includes a second current collector 1121 and a second active layer 1122, and the second active layer 1122 is disposed on the second current collector 1121. The diaphragm 113 includes a first film material 1131 and a second film material 1132, and the second film material 1132 is disposed on the end side of the first film material 1131 along the first direction Z. The first film material 1131 is disposed opposite to the first active layer 1112, and the first film material 1131 is disposed opposite to the second active layer 1122. The second film material 1132 is located only outside the end side of the first active layer 1112 along the first direction Z; or, as shown in Figures 5 to 9, the second film material 1132 is located only outside the end side of the second active layer 1122 along the first direction Z; or, the second film material 1132 is located not only outside the end side of the first active layer 1112 along the first direction Z, but also outside the end side of the second active layer 1122 along the first direction Z. As shown in Figure 10, the second film material 1132 is only at least partially composited and fixed to the first pole piece 111; or, as shown in Figure 11, the second film material 1132 is only at least partially composited and fixed to the second pole piece 112; or, as shown in Figure 9, at least part of the second film material 1132 is composited and fixed to the first pole piece 111 and the second pole piece 112. The first direction Z is parallel to the first pole piece 111 and the second pole piece 112.

[0172] The first active layer 1112 refers to a structural layer of the first electrode 111 composed of active materials, which is used to release or insert ions during the charge and discharge process of the battery 100. The first active layer 1112 is provided on both opposite sides of the first current collector 1111.

[0173] The first current collector 1111 refers to a metal structure of the first electrode 111 that is used to support the first active layer 1112 , collect and output the current generated by the first active layer 1112 , and input the current to the first active layer 1112 .

[0174] The second active layer 1122 refers to a structural layer of the second electrode 112 composed of active materials, which is used to release or insert ions during the charge and discharge process of the battery 100. The second active layer 1122 is provided on both opposite sides of the second current collector 1121.

[0175] The second current collector 1121 refers to a metal structure of the second electrode 112 that is used to support the second active layer 1122 , collect and output the current generated by the second active layer 1122 , and input the current to the second active layer 1122 .

[0176] As an example, the first current collector 1111 is aluminum foil, and the second current collector 1121 is copper foil.

[0177] The first film 1131 and the second film 1132 are different parts of the diaphragm 113. The second film 1132 is disposed at one end of the first film 1131 along the first direction Z; or, the second film 1132 is disposed at both opposite ends of the first film 1131 along the first direction Z.

[0178] In the case where the second film material 1132 is disposed at both opposite ends of the first film material 1131 along the first direction Z: when the second film material 1132 is located only outside the end side of the first active layer 1112 along the first direction Z, the second film materials 1132 at the opposite ends can be located outside the opposite ends of the first active layer 1112 along the first direction Z. When the second film material 1132 is located only outside the end side of the second active layer 1122 along the first direction Z, as shown in Figures 5 to 11, the second film materials 1132 at the opposite ends can be located outside the opposite ends of the second active layer 1122 along the first direction Z. When the second film material 1132 is located not only outside the end side of the first active layer 1112 along the first direction Z, but also outside the end side of the second active layer 1122 along the first direction Z, the second film materials 1132 at the opposite ends are located outside the opposite ends of the first active layer 1112 along the first direction Z, and are located outside the opposite ends of the second active layer 1122 along the first direction Z.

[0179] The first direction Z is parallel to the first electrode piece 111 and the second electrode piece 112, which means that the first direction Z is parallel to the surface of the first electrode piece 111, and the first direction Z is parallel to the surface of the second electrode piece 112. Specifically, the first direction Z is parallel to the first current collector 1111 and the first active layer 1112, and the first direction Z is parallel to the second current collector 1121 and the second active layer 1122.

[0180] It should be noted that when the electrode assembly 11 is a stack, as shown in Figures 5 and 6, the first direction Z is any direction parallel to the first electrode piece 111 and the second electrode piece 112. It can be understood that the first direction Z is any direction perpendicular to the stacking direction of the first electrode piece 111 and the second electrode piece 112, that is, any direction on the plane perpendicular to the stacking direction of the first electrode piece 111 and the second electrode piece 112. Among them, the first direction Z can be one of the above-mentioned arbitrary directions, or it can be multiple directions of the above-mentioned arbitrary directions. As an example, as shown in Figure 5, the second film material 1132 is located outside the end side of the second active layer 1122 along the X-axis, and is located outside the end side of the second active layer 1122 along the Z-axis, that is, the first direction Z includes the direction where the X-axis is located and the direction where the Z-axis is located. Of course, in other examples, the first direction Z can also be the direction where the Z-axis is located, or it can be the direction where the X-axis is located.

[0181] When the electrode assembly 11 is a wound body, as shown in Figures 3, 4, 7 to 11, the first direction Z is parallel to the central axis of the electrode assembly 11, and the first electrode sheet 111, the diaphragm 113 and the second electrode sheet 112 are stacked and wound around the central axis to form the electrode assembly 11.

[0182] When the second film material 1132 is located only outside the end side of the first active layer 1112 along the first direction Z, the second active layer 1122 is arranged to extend beyond the first active layer 1112 along the first direction Z. This allows at least a portion of the second film material 1132 to be positioned opposite the portion of the second active layer 1122 extending beyond the first active layer 1112, and is not located outside the end side of the second active layer 1122 along the first direction Z. In this manner, the second film material 1132 is not completely opposite to the first active layer 1112, and is not compositely fixed to the first active layer 1112. In this way, the first active layer 1112 is not used for the composite operation, and the first film material 1131 opposite to the first active layer 1112 and the part of the second active layer 1122 opposite to the first active layer 1112 are not used for the composite operation. In this way, the size of the first film material 1131 along the first direction Z is greater than or equal to the size of the first active layer 1112 along the first direction Z, and thus the first film material 1131 has a larger proportion in the diaphragm 113, that is, a larger part of the diaphragm 113 is not used for the composite operation, and has good air permeability and ion conductivity, thereby improving the charge and discharge performance of the battery 100 single cell, so as to improve the dynamic performance of the battery 100 single cell.

[0183] When the second film material 1132 is located only outside the end side of the second active layer 1122 along the first direction Z, as shown in Figures 6 to 11 , the first active layer 1112 is arranged to extend beyond the second active layer 1122 along the first direction Z, so that at least a portion of the second film material 1132 is arranged opposite the portion of the first active layer 1112 extending beyond the second active layer 1122, and is not located outside the end side of the first active layer 1112 along the first direction Z. In this way, the second active layer 1122 is not completely opposite the second film material 1132 and is not compositely fixed to the second active layer 1122. In this way, the second active layer 1122 is not used for the composite operation, and the first film material 1131 opposite to the second active layer 1122 and the part of the first active layer 1112 opposite to the second active layer 1122 are not used for the composite operation. In this way, the size of the first film material 1131 along the first direction Z is greater than or equal to the size of the second active layer 1122 along the first direction Z, and thus the first film material 1131 has a larger proportion in the diaphragm 113, that is, a larger part of the diaphragm 113 is not used for the composite operation, and has good air permeability and ion conductivity, thereby improving the charge and discharge performance of the battery 100 single cell, so as to improve the dynamic performance of the battery 100 single cell.

[0184] When the second film material 1132 is not only located outside the end side of the first active layer 1112 along the first direction Z, but also located outside the end side of the second active layer 1122 along the first direction Z, the second film material 1132 is completely not opposite to the first active layer 1112 and the second active layer 1122, and thus is not compositely fixed with the first active layer 1112 and the second active layer 1122. In this way, neither the first active layer 1112 nor the second active layer 1122 is used for the composite operation, nor is the first film material 1131 opposite the first active layer 1112 and the second active layer 1122. This ensures that the size of the first film material 1131 along the first direction Z is greater than or equal to the size of the first active layer 1112 and the size of the second active layer 1122 along the first direction Z. This, in turn, allows the first film material 1131 to occupy a larger proportion of the separator 113, meaning that a larger portion of the separator 113 is not used for the composite operation, resulting in better air permeability and ion conductivity, thereby improving the charge and discharge performance of the battery 100 cells and thereby improving the dynamic performance of the battery 100 cells. The end side of the first active layer 1112 along the first direction Z can be flush with the end side of the second active layer 1122 along the first direction Z. The first active layer 1112 can also extend beyond the second active layer 1122 along the first direction Z, and the second active layer 1122 can also extend beyond the first active layer 1112 along the first direction Z.

[0185] In the case where at least a portion of the second film material 1132 is compositely fixed to the first electrode piece 111 and the second electrode piece 112, a portion of the second film material 1132 is compositely fixed to the first electrode piece 111, and a portion of the second film material 1132 is compositely fixed to the second electrode piece 112. The portion of the second film material 1132 compositely fixed to the first electrode piece 111 and the portion of the second film material 1132 compositely fixed to the second electrode piece 112 may be overlapped or may not be overlapped.

[0186] The second film material 1132 is located outside the end side of the first active layer 1112 and / or the second active layer 1122 along the first direction Z, and is at least partially composited and fixed to the first electrode piece 111 and / or the second electrode piece 112; the first film material 1131 is opposite the first active layer 1112 and the second active layer 1122 and is not used for composite operation. In this way, the first film material 1131 has a larger proportion in the separator 113, that is, a larger portion of the separator 113 is not used for composite operation, and has better air permeability and ion conductivity, thereby improving the charge and discharge performance of the battery 100 cells, thereby improving the dynamic performance of the battery 100 cells. Moreover, since the second film material 1132 is located outside the end side of the first active layer 1112 and / or the second active layer 1122 along the first direction Z, the end side of the diaphragm 113 along the first direction Z is used for the composite operation, while the middle part of the diaphragm 113 along the first direction Z is not used for the composite operation. This facilitates the intercalation and deintercalation of ions in the first active layer 1112 and the second active layer 1122, thereby improving the charge and discharge performance of the battery 100 monomer, thereby improving the dynamic performance of the battery 100 monomer.

[0187] In addition, the second film material 1132 is located outside the end side of the first active layer 1112 and / or the second active layer 1122 along the first direction Z, so that the end side of the diaphragm 113 along the first direction Z is used for composite operations, which can effectively improve the problem of folding of the diaphragm 113, and further improve the problem that the diaphragm 113 cannot wrap the electrode piece due to the folding of the diaphragm 113, causing the first electrode piece 111 and the second electrode piece 112 to overlap and cause self-discharge of the electrode assembly 11.

[0188] 6 to 11 in conjunction with other figures, the first active layer 1112 extends beyond the second active layer 1122 along the first direction Z, and the second film 1132 is located outside the end side of the second active layer 1122 along the first direction Z.

[0189] The first active layer 1112 extends beyond the second active layer 1122 along the first direction Z, such that the dimension of the first active layer 1112 along the first direction Z is greater than the dimension of the second active layer 1122 along the first direction Z. Furthermore, the first active layer 1112 may completely cover the second active layer 1122 in the first direction Z. As shown in FIG6 to FIG11 , the first active layer 1112 may extend beyond opposite ends of the second active layer 1122 along the first direction Z, or may extend beyond one end of the second active layer 1122 along the first direction Z.

[0190] In some possible designs, the first electrode 111 is a negative electrode, and the second electrode 112 is a positive electrode.

[0191] With this arrangement, the active layer of the first electrode piece 111 extends beyond the active layer of the second electrode piece 112, such that the active layer of the first electrode piece 111 is larger than the active layer of the second electrode piece 112 along the first direction Z. This can alleviate the problem of ions being unable to fully embed into the first active layer 1112 after escaping from the second active layer 1122. This can further alleviate the problems of ions accumulating outside the first and second active layers 1112, puncturing the diaphragm 113, and ion precipitation. Moreover, by positioning the second film material 1132 outside the end side of the second active layer 1122 along the first direction Z, the second active layer 1122 is not composited and fixed with the diaphragm 113, so that the size of the first film material 1131 along the first direction Z is greater than or equal to the size of the second active layer 1122 along the first direction Z, and thus the first film material 1131 has a larger proportion in the diaphragm 113, that is, a larger portion of the diaphragm 113 is not used for composite operations, which facilitates the intercalation and deintercalation of ions in the first active layer 1112 and the second active layer 1122, thereby improving the charge and discharge performance of the battery 100 monomer, thereby improving the dynamic performance of the battery 100 monomer.

[0192] It should be noted that the second film material 1132 is located outside the end side of the second active layer 1122 along the first direction Z, so that the second film material 1132 can be arranged opposite to the portion of the first active layer 1112 that extends outside the second active layer 1122 .

[0193] In some embodiments, please refer to Figures 6 to 11, and Figure 16 in conjunction with other figures. Figure 16 is a schematic diagram of the structure shown in Figure 9 under further embodiments. The second film 1132 also extends beyond the first active layer 1112 along the first direction Z.

[0194] Such a configuration allows the second film material 1132 to better achieve insulation between the portion of the first active layer 1112 extending beyond the second active layer 1122 and the second electrode piece 112 , thereby improving the overlap problem between the first active layer 1112 and the second electrode piece 112 .

[0195] In some embodiments, referring to FIG9 and FIG10 together with other figures, at least a portion of the second film material 1132 is compositely fixed to a portion of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z.

[0196] It is understandable that in some possible designs, as shown in Figures 9 and 10, all of the second film material 1132 is compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z. On this basis, the second film material 1132 can be compositely fixed only to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z, as shown in Figure 10; or it can be compositely fixed not only to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z, but also at least a portion of the second film material 1132 can be compositely fixed to the insulating layer 1123 of the second pole piece 112, as shown in Figure 9. Alternatively, in other possible designs, as shown in FIG16 , a portion of the second film material 1132 is compounded and fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z; another portion of the second film material 1132 may not be used for the compounding operation, or may be compounded and fixed to the insulating layer 1123 of the second pole piece 112 mentioned below, or may be partially compounded and fixed to the insulating layer 1123, and partially not used for the compounding operation.

[0197] By adopting the above technical solution, the second film material 1132 is located outside the end side of the second active layer 1122 along the first direction Z, and is opposite and compositely fixed to the portion of the first active layer 1112 that extends outside the second active layer 1122 along the first direction Z. In this way, composite fixation of the second film material 1132 of the diaphragm 113 and the first electrode piece 111 is achieved, which can maintain insulation between the first electrode piece 111 and the second electrode piece 112 by the diaphragm 113, and improve the problem of overlapping of the first electrode piece 111 and the second electrode piece 112 caused by the diaphragm 113 being unable to wrap around the electrode piece due to folding.

[0198] In some embodiments, referring to Figures 9, 10, and 16 in conjunction with other figures, at least one side or two opposite sides of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z are compositely fixed to the second film material 1132 .

[0199] It can be understood that in some possible designs, as shown in FIG16 , one side of all portions of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z is compositely fixed to the second film material 1132. Alternatively, in other possible designs, as shown in FIG9 and FIG10 , both opposite sides of all portions of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z are compositely fixed to the second film material 1132. Alternatively, in still other possible designs, one side of a portion of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z is compositely fixed to the second film material 1132, and both opposite sides of another portion of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z are compositely fixed to the second film material 1132. Alternatively, in some other possible designs, one side of a portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z is laminated and fixed to the second film material 1132, while the other portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z is not used for the lamination operation. Alternatively, two opposite sides of a portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z are laminated and fixed to the second film material 1132, while the other portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z is not used for the lamination operation.

[0200] As an example, as shown in Figures 9 and 10, the first active layer 1112 has a diaphragm 113 on both sides of the opposite sides, and the second active layer 1122 is respectively composited and fixed to the second film material 1132 on the opposite sides. This arrangement allows the diaphragm 113 to be better composited and fixed to the first electrode 111.

[0201] By adopting the above technical solution, the composite operation of the second film material 1132 and the portion of the first active layer 1112 extending beyond the second active layer 1122 is very flexible.

[0202] In some embodiments, referring to Figures 9-10 and 16 in conjunction with other figures, in some possible designs, the portion of the first active layer 1112 that extends beyond one end of the second active layer 1122 along the first direction Z is compositely fixed to the second film material 1132. Alternatively, in other possible designs, such as Figures 9-10 and 16, the portions of the first active layer 1112 that extend beyond both opposite ends of the second active layer 1122 along the first direction Z are compositely fixed to the second film material 1132.

[0203] By arranging the portion of the first active layer 1112 that extends beyond one end of the second active layer 1122 along the first direction Z to be composited and fixed to the second film material 1132, the proportion of the first active layer 1112 used for composite operation can be reduced, thereby correspondingly increasing the proportion of the portion of the separator 113 not used for composite operation. In other words, the majority of the separator 113 is not used for composite operation, thus having better air permeability and ion conductivity. In this way, the first active layer 1112 can effectively intercalate and deintercalate ions, thereby improving the charge and discharge performance of the battery 100 cells and thus enhancing the dynamic performance of the battery 100 cells.

[0204] By providing that the portions of the first active layer 1112 that extend beyond the opposite ends of the second active layer 1122 along the first direction Z are both compositely fixed to the second film material 1132, the composite fixing effect of the separator 113 on the electrode assembly 11 can be improved. It should be noted that the portions of the first active layer 1112 that extend beyond the opposite ends of the second active layer 1122 along the first direction Z can be compositely fixed to the second film material 1132 on the same side, or can be compositely fixed to the second film material 1132 on opposite sides.

[0205] In some embodiments, referring to Figures 6 to 11 and 16 in conjunction with other figures, the second pole piece 112 further includes an insulating layer 1123. The insulating layer 1123 is disposed on the second current collector 1121 and on the end side of the second active layer 1122 along the first direction Z. The insulating layer 1123 extends beyond the first active layer 1112 along the first direction Z and is disposed opposite the second film 1132.

[0206] The insulating layer 1123 is a structural layer made of an insulating material. The insulating layer 1123 is disposed on two opposite sides of the first current collector 1111 .

[0207] The insulating layer 1123 is disposed opposite to the second film material 1132 , so that the insulating layer 1123 is also disposed opposite to a portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z.

[0208] The insulating layer 1123 is disposed at one end of the second active layer 1122 along the first direction Z. Alternatively, the insulating layer 1123 is disposed at both opposite ends of the second active layer 1122 along the first direction Z.

[0209] By setting the insulating layer 1123 on the end side of the second active layer 1122 along the first direction Z and extending beyond the first active layer 1112 along the first direction Z, the insulating layer 1123 can achieve an insulation effect between the first active layer 1112 and the second current collector 1121, thereby improving the problem of the first active layer 1112 piercing the diaphragm 113 and overlapping the second current collector 1121.

[0210] In some embodiments, please refer to FIG. 9 , FIG. 11 , and FIG. 16 in conjunction with other drawings. At least a portion of the second film material 1132 is compositely fixed to the insulating layer 1123 .

[0211] It is understood that in some possible designs, a portion of the second film material 1132 is compositely fixed to the insulating layer 1123; another portion of the second film material 1132 may not be used for the composite operation, or may be compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z. Alternatively, a portion of the second film material 1132 may be compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z, while another portion of the second film material 1132 is not used for the composite operation. Alternatively, in other possible designs, as shown in Figures 9, 11, and 16, all of the second film material 1132 is compositely fixed to the insulating layer 1123.

[0212] It should be noted that the second film material 1132 is disposed opposite the insulating layer 1123, and also opposite the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z. As an example, as shown in FIG9 , the second film material 1132 can be compositely fixed to both the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z and the insulating layer 1123. Specifically, one side of the second film material 1132 is compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z, and the other side is compositely fixed to the insulating layer 1123.

[0213] By fixing at least a portion of the second film material 1132 on the insulating layer 1123, the second film material 1132 can be fixedly located between the insulating layer 1123 and the portion of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z. This allows the diaphragm 113 to effectively achieve insulation between the first electrode piece 111 and the second electrode piece 112, thereby improving the problem of overlap between the first active layer 1112 and the second current collector 1121, that is, improving the problem of self-discharge of the electrode assembly 11 caused by overlap between the first electrode piece 111 and the second electrode piece 112.

[0214] In some embodiments, referring to FIG. 6 to FIG. 9 , FIG. 11 and FIG. 16 in conjunction with other drawings, at least a portion of the insulating layer 1123 is compositely fixed to the second film material 1132 on one side or two opposite sides.

[0215] It will be appreciated that in some possible designs, as shown in Figures 7 to 9, 11, and 16, one side of all insulating layers 1123 is compositely fixed to the second film material 1132. Alternatively, in other possible designs, as shown in Figure 6, both opposing sides of all insulating layers 1123 have the second film material 1132, and both opposing sides of all insulating layers 1123 are compositely fixed to the corresponding second film material 1132. Alternatively, in still other possible designs, one side of a portion of the insulating layers 1123 is compositely fixed to the second film material 1132, while both opposing sides of another portion of the insulating layers 1123 are compositely fixed to the second film material 1132. Alternatively, in still other possible designs, one side of a portion of the insulating layers 1123 is compositely fixed to the second film material 1132, while the other portion of the insulating layers 1123 is not used for the composite operation. Alternatively, both opposing sides of a portion of the insulating layers 1123 are compositely fixed to the second film material 1132, while the other portion of the insulating layers 1123 is not used for the composite operation.

[0216] By adopting the above technical solution, at least one side or both sides of a portion of the insulating layer 1123 are compositely fixed to the second film material 1132 , making the composite operation of the second pole piece 112 and the diaphragm 113 very flexible.

[0217] In some embodiments, referring to Figures 9, 11, and 16 in conjunction with other figures, the second current collector 1121 is provided with a second tab 11211. The second tab 11211 is located outside one end of the second active layer 1122 along the first direction Z. In the first direction Z, the insulating layer 1123 is located between the second active layer 1122 and the second tab 11211.

[0218] The second electrode tab 11211 is a tab disposed on the second electrode sheet 112 , and is formed by extending from the second current collector 1121 .

[0219] In the first direction Z, the insulating layer 1123 is located between the second active layer 1122 and the second electrode tab 11211 , so that the insulating layer 1123 is disposed on the second current collector 1121 between the second active layer 1122 and the second electrode tab 11211 .

[0220] By locating the insulating layer 1123 between the second active layer 1122 and the second electrode tab 11211 and extending beyond the end of the first active layer 1112 along the first direction Z away from the second active layer 1122, the insulating layer 1123 can achieve insulation between the first active layer 1112 and the second current collector 1121, thereby improving the problem of the end of the first active layer 1112 along the first direction Z piercing the second film material 1132 and overlapping with the second current collector 1121.

[0221] In some embodiments, please refer to Figures 9, 11, 16, and 17 together, and in conjunction with other drawings. Figure 17 is a schematic diagram of the structure shown in Figure 9 under some further embodiments. The first current collector 1111 is provided with a first pole tab 11111, and the first pole tab 11111 is provided at one end of the first active layer 1112 along the first direction Z. The second current collector 1121 is provided with a second pole tab 11211. In some possible designs, as shown in Figures 9, 11, and 16, the second pole tab 11211 is located at one end of the second active layer 1122 along the first direction Z close to the first pole tab 11111; or, in other possible designs, as shown in Figure 17, the second pole tab 11211 is located at one end of the second active layer 1122 along the first direction Z away from the first pole tab 11111.

[0222] The first electrode tab 11111 is a tab disposed on the first electrode sheet 111 , and is formed by extending from the first current collector 1111 .

[0223] 9 , 11 and 16 , the second electrode tab 11211 is located at one end of the second active layer 1122 close to the first electrode tab 11111 along the first direction Z. It is understood that the first electrode tab 11111 and the second electrode tab 11211 are located at the same end of the electrode assembly 11 along the first direction Z.

[0224] 7 , the second electrode tab 11211 is located at one end of the second active layer 1122 away from the first electrode tab 11111 along the first direction Z. It is understandable that the first electrode tab 11111 and the second electrode tab 11211 are located at opposite ends of the electrode assembly 11 along the first direction Z, respectively.

[0225] The insulating layer 1123 is disposed between the second electrode tab 11211 and the second active layer 1122 along the first direction Z. It can be understood that the insulating layer 1123 is disposed at one end of the second current collector 1121 along the first direction Z close to the second electrode tab 11211 .

[0226] Such an arrangement allows the first electrode tab 11111 and the second electrode tab 11211 to be disposed at the same end or opposite ends of the electrode assembly 11 along the first direction Z. Thus, the insulating layer 1123 can be located at one end of the second current collector 1121 close to or away from the first electrode tab 11111 along the first direction Z, thereby achieving insulation between the second current collector 1121 and the first active layer 1112 and improving the problem of the end of the first active layer 1112 piercing the separator 113 and overlapping the second current collector 1121.

[0227] In some embodiments, referring to Figures 9 to 11, 16, and 17 in conjunction with other figures, as shown in Figures 9 to 11, 16, and 17, at least one side of a portion of the second film material 1132 is compositely fixed to the first pole piece 111 or the second pole piece 112; and / or, as shown in Figures 9 and 17, at least two opposite sides of a portion of the second film material 1132 are compositely fixed to the first pole piece 111 and the second pole piece 112, respectively.

[0228] It can be understood that in some possible designs, as shown in Figures 10, 11 and 16, one side of all the second film materials 1132 is compositely fixed to the first pole piece 111 or the second pole piece 112. Alternatively, in other possible designs, the opposite sides of all the second film materials 1132 are compositely fixed to the first pole piece 111 and the second pole piece 112, respectively. Alternatively, in some other possible designs, as shown in Figures 9 and 17, one side of a portion of the second film materials 1132 is compositely fixed to the first pole piece 111 or the second pole piece 112, and the opposite sides of another portion of the second film materials 1132 are compositely fixed to the first pole piece 111 and the second pole piece 112, respectively. Alternatively, in some other possible designs, one side of a portion of the second film materials 1132 is compositely fixed to the first pole piece 111 or the second pole piece 112, and the other portion of the second film materials 1132 is not used for the composite operation. Alternatively, two opposite sides of a portion of the second film material 1132 are respectively composited and fixed to the first pole piece 111 and the second pole piece 112 , and another portion of the second film material 1132 is not used for the composite operation.

[0229] The second film material 1132 has two opposite sides fixed to the first electrode piece 111 and the second electrode piece 112, respectively. Specifically, one side of the second film material 1132 is fixed to the first electrode piece 111, and the other side of the second film material 1132 is fixed to the second electrode piece 112. This improves the fixing effect of the second film material 1132, thereby better maintaining the insulation effect of the second diaphragm 113b between the first electrode piece 111 and the second electrode piece 112.

[0230] Such an arrangement makes the composite operation of the second film material 1132 on the electrode assembly 11 very flexible.

[0231] In some embodiments, referring to FIG. 9 and FIG. 10 in conjunction with other drawings, a second film material 1132 is provided at opposite ends of the first film material 1131 along the first direction Z. The second film material 1132 at each end of the first film material 1131 along the first direction Z is compositely fixed to the first electrode piece 111 and / or the second electrode piece 112.

[0232] The second film material 1132 at each end of the first film material 1131 along the first direction Z is compounded and fixed to the first pole piece 111 and / or the second pole piece 112, which means that the second film material 1132 at each end along the first direction Z can be compounded and fixed to the first pole piece 111, or compounded and fixed to the second pole piece 112, or compounded and fixed to the first pole piece 111 and the second pole piece 112 at the same time.

[0233] This arrangement allows the second film materials 1132 at opposite ends of the first film material 1131 along the first direction Z to be laminated, thereby securing the second film materials 1132 at opposite ends of the diaphragm 113 along the first direction Z relative to the first electrode piece 111 and the second electrode piece 112. This can alleviate the problem of the diaphragm 113 being unable to wrap around the electrode piece due to folding, resulting in the first electrode piece 111 and the second electrode piece 112 overlapping and causing self-discharge of the electrode assembly 11, and can better maintain the insulation effect of the diaphragm 113 between the first electrode piece 111 and the second electrode piece 112.

[0234] Based on the above structure, in some embodiments, as shown in Figures 9 to 11, 16, and 17, the first active layer 1112 extends beyond the second active layer 1122 along the first direction Z, and the second film material 1132 is located at the end side of the second active layer 1122 along the first direction Z. Based on this, at least a portion of the second film material 1132 is compositely fixed to the first electrode piece 111 and / or the second electrode piece 112, which means that at least a portion of the second film material 1132 can be compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z; can also be compositely fixed to the insulating layer 1123 on the second current collector 1121; or can be compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z on one side and compositely fixed to the insulating layer 1123 on the second current collector 1121 on the other side.

[0235] In other embodiments, the second active layer 1122 may extend beyond the first active layer 1112 along the first direction Z, and the second film material 1132 may be located at the end side of the first active layer 1112 along the first direction Z. Based on this, the first current collector 1111 may also be provided with the aforementioned insulating layer 1123, and the insulating layer 1123 may be located at the end side of the first active layer 1112 along the first direction Z. Based on this, at least a portion of the second film material 1132 is compositely fixed to the first electrode piece 111 and / or the second electrode piece 112, which means that at least a portion of the second film material 1132 may be compositely fixed to the portion of the second active layer 1122 that extends beyond the first active layer 1112 along the first direction Z; may also be compositely fixed to the insulating layer 1123 on the first current collector 1111; or may be compositely fixed to the portion of the second active layer 1122 that extends beyond the first active layer 1112 along the first direction Z on one side and compositely fixed to the insulating layer 1123 on the first current collector 1111 on the other side.

[0236] In some other embodiments, the second film material 1132 is located at the end side of the first active layer 1112 and the second active layer 1122 along the first direction Z. In this case, the first current collector 1111 and the second current collector 1121 can both be provided with the aforementioned insulating layer 1123. The insulating layer 1123 of the first current collector 1111 is located at the end side of the first active layer 1112 along the first direction Z, and the insulating layer 1123 of the second current collector 1121 is located at the end side of the second active layer 1122 along the first direction Z. Based on this, at least a portion of the second film material 1132 is compositely fixed to the first electrode piece 111 and / or the second electrode piece 112, which means that at least a portion of the second film material 1132 can be compositely fixed to the insulating layer 1123 on the first current collector 1111; can also be compositely fixed to the insulating layer 1123 on the second current collector 1121; and can also be compositely fixed to the insulating layer 1123 on the first current collector 1111 on one side and compositely fixed to the insulating layer 1123 on the second current collector 1121 on the other side.

[0237] It can be understood that the second film material 1132 and the first electrode piece 111 are compositely fixed, which means that the second film material 1132 and the first active layer 1112 of the first electrode piece 111 are compositely fixed, or that the second film material 1132 and the insulating layer 1123 of the first electrode piece 111 are compositely fixed. Correspondingly, the second film material 1132 and the second electrode piece 112 are compositely fixed, which means that the second film material 1132 and the insulating layer 1123 of the second electrode piece 112 are compositely fixed, or that the second film material 1132 and the second active layer 1122 of the second electrode piece 112 are compositely fixed.

[0238] It should be noted that the term "one side" refers to one surface, and "two opposite sides" refers to two opposite surfaces. For reference, "one side" of the insulating layer 1123 refers to one surface of the insulating layer 1123 , and "two opposite sides" of the insulating layer 1123 refer to two opposite surfaces of the insulating layer 1123 .

[0239] As shown in Figures 9 to 11, 16, and 17, the electrode assembly 11 includes a first electrode sheet 111, a second electrode sheet 112, a first separator 113a, and a second separator 113b. The first separator 113a, the first electrode sheet 111, the second separator 113b, and the second electrode sheet 112 are sequentially stacked or stacked and wound. The second film material 1132 is provided at both ends of the first separator 113a and both ends of the second separator 113b that are opposite to each other along the first direction Z. Composite fixation can be performed between one end of the first diaphragm 113a along the first direction Z and the first active layer 1112, between the other end of the first diaphragm 113a along the first direction Z and the first active layer 1112, between one end of the second diaphragm 113b along the first direction Z and the first active layer 1112, between one end of the second diaphragm 113b along the first direction Z and the insulating layer 1123, and between the other end of the second diaphragm 113b along the first direction Z and the first active layer 1112, that is, there are a total of 5 areas that can be composite fixed. In actual applications, at least one of the above five areas can be used for composite fixation so that part of the diaphragm 113 is composite fixed to the first electrode 111 and / or the second electrode 112.

[0240] In some embodiments, please refer to Figures 18 to 20 in conjunction with other figures. Figure 18 is a schematic diagram of the first electrode piece 111 and the separator 113 of the electrode assembly 11 shown in Figure 3 after stacking and before winding, Figure 19 is a schematic diagram of the structure shown in Figure 18 under another embodiment, and Figure 20 is a schematic diagram of the structure shown in Figure 18 under yet another embodiment. In Figures 18 to 20, the first electrode piece 111 is indicated by a dotted line, and the first composite structure a is indicated by a shaded portion. The second film material 1132 is composited with the first electrode piece 111 to form the first composite structure a. In some possible designs, as shown in Figure 18, the first composite structures a of the first pole piece 111 at each end of the first direction Z are arranged at intervals; or, in other possible designs, as shown in Figure 19, the first composite structures a of the first pole piece 111 at each end of the first direction Z are arranged continuously; or, in some other possible designs, as shown in Figure 20, the first pole piece 111 is formed with two groups of the above-mentioned first composite structures a, and the two groups of first composite structures a are distributed at intervals along the first direction Z, wherein one group of the first composite structures a is arranged at intervals, and the other group of the first composite structures a is arranged continuously.

[0241] The first composite structure a refers to a structure formed by combining the second film material 1132 and the first pole piece 111 .

[0242] It should be noted that the second film material 1132 is provided at one end of the first active layer 1112 and / or the second active layer 1122 along the first direction Z; alternatively, the second film material 1132 is provided at both opposite ends of the first active layer 1112 and / or the second active layer 1122 along the first direction Z. Based on this, the first electrode piece 111 can be compositely fixed to the second film material 1132 at one end along the first direction Z, or compositely fixed to the second film material 1132 at both opposite ends along the first direction Z. In this way, the first electrode piece 111 has the first composite structure a at one end along the first direction Z, or the first electrode piece 111 has the first composite structure a at both opposite ends along the first direction Z.

[0243] One group of first composite structures a is arranged at intervals, and the other group of first composite structures a is arranged continuously, which means that the first composite structures a at one end of the first pole piece 111 along the first direction Z are arranged at intervals, and the first composite structures a at the other end of the first pole piece 111 along the first direction Z are arranged continuously.

[0244] By adopting the above technical solution, the composite operation of the first pole piece 111 and the second film material 1132 is very flexible.

[0245] It should be noted that by staggered arrangement of the first composite structures a at each end of the first electrode 111 in the first direction Z, only a portion of the second film material 1132 is used for composite operations, while the other portion is not used for composite operations. This allows a portion of the second film material 1132 to have good air permeability and ion conductivity, allowing a larger portion of the diaphragm 113 to be unused for composite operations, resulting in better air permeability and ion conductivity, facilitating ion deintercalation between the first electrode 111 and the second electrode 112, thereby improving the charge and discharge performance of the battery 100 cells and thereby improving the dynamic performance of the battery 100 cells. By continuously arranging the first composite structures a at each end of the first electrode 111 in the first direction Z, the composite fixing operation of the first electrode 111 and the second film material 1132 is very simple.

[0246] In some embodiments, please refer to Figures 21 and 22 together, and in combination with other drawings. Figure 21 is a schematic diagram of the second electrode piece 112 and the diaphragm 113 of the electrode assembly 11 shown in Figure 3 after stacking and before winding, and Figure 22 is a schematic diagram of the structure shown in Figure 21 under another embodiment. In Figures 21 and 22, the second electrode piece 112 is indicated by a dotted line, and the second composite structure b is indicated by a shaded portion. The second film material 1132 is compounded with the second electrode piece 112 to form the second composite structure b. In some possible designs, as shown in Figure 20, the second composite structures b on the second electrode piece 112 are arranged at intervals; or, in other possible designs, as shown in Figure 21, the second composite structure b on the second electrode piece 112 is arranged continuously.

[0247] The second composite structure b refers to a structure formed by combining the second film material 1132 and the second pole piece 112 .

[0248] By adopting the above technical solution, the composite operation of the second pole piece 112 and the second film material 1132 is very flexible.

[0249] In some embodiments, please refer to Figures 13 to 15 and other figures. The diaphragm 113 includes a substrate 1133 and an adhesive layer 1134, and the adhesive layer 1134 is provided on opposite sides of the substrate 1133. In some possible designs, the diaphragm 113 is bonded to the first pole piece 111 through the adhesive layer 1134 to be compositely fixed to the first pole piece 111. Alternatively, in other possible designs, the diaphragm 113 is bonded to the second pole piece 112 through the adhesive layer 1134 to be compositely fixed to the second pole piece 112. Alternatively, in yet other possible designs, the diaphragm 113 is bonded to the first pole piece 111 and the second pole piece 112 through the adhesive layer 1134 to be compositely fixed to the first pole piece 111 and the second pole piece 112.

[0250] The substrate 1133 refers to a structural layer of the diaphragm 113 for supporting the adhesive layer 1134. The adhesive layer 1134 refers to a structural layer provided on the substrate 1133 for bonding. Both the substrate 1133 and the adhesive layer 1134 can be used to pass ions.

[0251] It can be understood that during the composite operation, the diaphragm 113 is bonded and fixed by its own adhesive layer 1134 to achieve a composite fixing effect.

[0252] Among them, the diaphragm 113 is bonded to the first electrode piece 111 and the second electrode piece 112 through the adhesive layer 1134. Specifically, the adhesive layer 1134 on one side of the diaphragm 113 is bonded to the first electrode piece 111, and the adhesive layer 1134 on the other side of the diaphragm 113 is bonded to the second electrode piece 112, thereby achieving the effect of the diaphragm 113 being compositely fixed to the first electrode piece 111 and the second electrode piece 112.

[0253] In some embodiments, please refer to Figures 6 to 11, 16 and 17, and in combination with other drawings. The electrode assembly 11 may also include a first adhesive layer 12, and the first adhesive layer 12 is provided on the diaphragm 113. In some possible designs, the diaphragm 113 is bonded to the first electrode piece 111 through the first adhesive layer 12 to be compositely fixed to the first electrode piece 111; or, in other possible designs, the diaphragm 113 is bonded to the second electrode piece 112 through the first adhesive layer 12 to be compositely fixed to the second electrode piece 112; or, in yet other possible designs, the diaphragm 113 is bonded to the first electrode piece 111 and the second electrode piece 112 through the first adhesive layer 12 to be compositely fixed to the first electrode piece 111 and the second electrode piece 112.

[0254] The first adhesive layer 12 refers to a structural layer having adhesive bonding capability.

[0255] It can be understood that during the composite operation, the first adhesive layer 12 is bonded to the diaphragm 113 and to the first pole piece 111 and / or the second pole piece 112 , thereby achieving a composite fixing effect.

[0256] In some embodiments, the electrode assembly 11 may further include a second adhesive layer, which is disposed on the first electrode piece 111. The first electrode piece 111 is bonded to the diaphragm 113 via the second adhesive layer, so as to be compositely fixed to the diaphragm 113.

[0257] The second adhesive layer refers to a structural layer with adhesive bonding capabilities.

[0258] It can be understood that during the composite operation, the second adhesive layer adheres the diaphragm 113 to the first pole piece 111 , thereby achieving a composite fixing effect of the diaphragm 113 and the first pole piece 111 .

[0259] As an example, the second adhesive layer is disposed on the first active layer 1112 of the first electrode piece 111 .

[0260] In some embodiments, the electrode assembly 11 may further include a third adhesive layer, which is disposed on the second electrode piece 112. The second electrode piece 112 is bonded to the diaphragm 113 via the second adhesive layer, so as to be compositely fixed to the diaphragm 113.

[0261] The third adhesive layer refers to a structural layer with adhesive bonding capabilities.

[0262] It can be understood that during the composite operation, the third adhesive layer adheres the diaphragm 113 to the second pole piece 112 , thereby achieving a composite fixing effect of the diaphragm 113 and the second pole piece 112 .

[0263] As an example, the third adhesive layer is disposed on the insulating layer 1123 of the second pole piece 112 .

[0264] It should be noted that the above embodiments can be set one by one or in combination. As an example, the first adhesive layer 12 and the second adhesive layer can be set at the same time, so that the first adhesive layer 12 and the second adhesive layer are bonded to achieve composite fixation between the diaphragm 113 and the first electrode 111.

[0265] By adopting the above technical solution, during the composite operation, the diaphragm 113 can achieve composite fixation effect by bonding.

[0266] In some embodiments, referring to Figures 4, 12, 13, and 14, in conjunction with other figures, the first electrode sheet 111 and the second electrode sheet 112 are stacked and wound. Furthermore, in some possible designs, as shown in Figures 4, 12, 13, the electrode assembly 11 is flat; or, in other possible designs, as shown in Figure 13, the electrode assembly 11 is cylindrical.

[0267] It should be noted that after the first electrode sheet 111 , the separator 113 and the second electrode sheet 112 are stacked and wound, the wound whole can be subjected to an extrusion shaping operation to obtain a flat electrode assembly 11 .

[0268] By setting the electrode assembly 11 as a flat or cylindrical structure formed by stacking and winding the first electrode sheet 111 and the second electrode sheet 112, and fixing the diaphragm 113 to the first electrode sheet 111 and / or the second electrode sheet 112 through partial compounding, the adhesive layer 1134 on the diaphragm 113 can provide appropriate buffering between the first electrode sheet 111 and the second electrode sheet 112, thereby improving the problem of the first electrode sheet 111 and / or the second electrode sheet 112 breaking during the charging and discharging process of the battery 100 single cell.

[0269] Referring to FIG. 2 and the other accompanying drawings, the battery 100 provided in the embodiment of the present application includes a battery cell 100. The battery cell 100 in this embodiment is identical to the battery cell 100 in the previous embodiment. For details, please refer to the description of the battery cell 100 in the previous embodiment, which will not be repeated here.

[0270] The battery 100 provided in the embodiment of the present application adopts the battery 100 monomer involved above, so that only a part of the diaphragm 113 is used for the composite operation, and the other parts of the diaphragm 113 are not used for the composite operation. This can improve the problem of poor overall air permeability of the diaphragm 113, help improve the ion conductivity of the diaphragm 113, and further help improve the charge and discharge performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer.

[0271] Referring to FIG1 , the electrical device provided in the embodiment of the present application includes a battery 100 or a battery 100. The battery 100 and the battery 100 in this embodiment are the same as those in the previous embodiment. For details, please refer to the description of the battery 100 and the battery 100 in the previous embodiment, which will not be repeated here.

[0272] The electrical device provided in the embodiment of the present application, by adopting the battery 100 cell or battery 100 involved above, helps to improve the charge and discharge performance of the battery 100 cell, thereby improving the dynamic performance of the battery 100 cell, thereby improving the reliability of the electrical device.

[0273] Please refer to Figures 12 and 23 together, and in conjunction with other drawings. Figure 23 is a schematic diagram of a composite device 2100 provided in some embodiments of the present application. The composite device 2100 provided in the embodiments of the present application is applied to a battery 100 monomer. In some possible designs, the composite device 2100 is only used to composite and fix a portion of the diaphragm 113 to the first pole piece 111; or, in other possible designs, the composite device 2100 is only used to composite and fix a portion of the diaphragm 113 to the second pole piece 112; or, in yet other possible designs, the composite device 2100 is used to composite and fix a portion of the diaphragm 113 to the first pole piece 111 and the second pole piece 112. Among them, the battery 100 monomer in this embodiment is the same as the battery 100 monomer in the previous embodiment. Please refer to the relevant description of the battery 100 monomer in the previous embodiment for details, which will not be repeated here.

[0274] The composite device 2100 provided in the embodiment of the present application is used to composite and fix part of the diaphragm 113 to the first pole piece 111 and / or the second pole piece 112, so that only a part of the diaphragm 113 is used for the composite operation, and the other parts of the diaphragm 113 are not used for the composite operation. This can improve the problem of poor overall air permeability of the diaphragm 113, help improve the ion conductivity of the diaphragm 113, and further help improve the charge and discharge performance of the battery 100 single cell, thereby improving the dynamic performance of the battery 100 single cell.

[0275] In some embodiments, referring to Figures 12 and 23 in conjunction with other figures, a compound device 2100 includes a compound mechanism 2110, which is used to perform compound operations. In some possible designs, as shown in Figure 12, there is only one compound mechanism 2110; alternatively, in other possible designs, as shown in Figure 23, there are multiple compound mechanisms 2110, each of which is used to perform compound operations sequentially.

[0276] Specifically, the composite mechanism 2110 is used to perform a composite operation on at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 to achieve a composite fixing effect of at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 .

[0277] In an embodiment in which there is one composite structure 2110, when the diaphragm 113 only needs to be composited and fixed with the first electrode piece 111, then only the first electrode piece 111 and the diaphragm 113 need to pass through the composite structure 2110, while the second electrode piece 112 does not need to pass through the composite structure 2110 for composite operation. Accordingly, when the diaphragm 113 only needs to be composited and fixed with the second electrode piece 112, then only the second electrode piece 112 and the diaphragm 113 need to pass through the composite structure 2110, while the first electrode piece 111 does not need to pass through the composite structure 2110 for composite operation. When the diaphragm 113 needs to be composited and fixed to the first electrode piece 111 and the second electrode piece 112, as shown in FIG12 , the stacked structure of the first electrode piece 111, the diaphragm 113, and the second electrode piece 112 needs to pass through the composite structure 2110 for composite fixing operation.

[0278] In an embodiment in which there are multiple composite structures 2110, taking the case where there are two diaphragms 113, namely a first diaphragm 113a and a second diaphragm 113b, and the first diaphragm 113a, the first electrode piece 111, the second diaphragm 113b, and the second electrode piece 112 are stacked and wound to form the electrode assembly 11 as an example: if the diaphragm 113 only needs to be composited and fixed with the first electrode piece 111, the first diaphragm 113a and the first electrode piece 111 can first be composited and fixed through the first composite structure 2110, and then composited and fixed with the second diaphragm 113b through the second composite structure 2110. Based on this, the first composite structure 2110 can composite and fix the second film material 1132 of at least one end of the first diaphragm 113a along the first direction Z to the first electrode piece 111, and the second composite structure 2110 can also composite and fix the second film material 1132 of at least one end of the second diaphragm 113b along the first direction Z to the first electrode piece 111. As an example, the first composite structure 2110 compositely fixes one end of the first electrode piece 111 along the first direction Z to the first diaphragm 113a, and the second composite structure 2110 compositely fixes the other end of the first electrode piece 111 along the first direction Z to the second diaphragm 113b.

[0279] When the diaphragm 113, the first electrode 111 and the second electrode 112 need to be compositely fixed, the first diaphragm 113a and the first electrode 111 can be compositely fixed first through the first composite mechanism 2110, and then compositely fixed with the second diaphragm 113b and the second electrode 112 through the second composite mechanism 2110, as shown in Figure 23; the first diaphragm 113a, the first electrode 111 and the second diaphragm 113b can also be compositely fixed first through the first composite mechanism 2110, and then compositely fixed with the second electrode 112 through the second composite mechanism 2110; the first diaphragm 113a and the first electrode 111 can even be compositely fixed first through the first composite mechanism 2110, and then compositely fixed with the second diaphragm 113b through the second composite mechanism 2110, and finally compositely fixed with the second electrode 112 through the third composite mechanism 2110... and so on. Then, when the number of diaphragms 113 is greater than two and the number of first pole pieces 111 and / or second pole pieces 112 is multiple, a composite fixing operation can be performed sequentially through multiple composite mechanisms 2110. Based on this, each composite mechanism 2110 can perform a composite fixing operation on one or both ends of the diaphragm 113 along the first direction Z.

[0280] By adopting the above technical solution, the number of the composite mechanisms 2110 can be selected according to the desired composite fixing effect, thereby making the composite operation very flexible.

[0281] In some embodiments, please refer to Figure 24, in conjunction with other figures. Figure 24 is a schematic diagram of a compounding mechanism 2110 of a compounding device 2100 provided in some embodiments of the present application. The compounding mechanism 2110 includes a first compounding roller 2111 and a second compounding roller 2112. The first compounding roller 2111 includes a first rotating roller 21111 and a first protrusion 21112 provided on the outer peripheral side of the first rotating roller 21111. The first protrusion 21112 and the second compounding roller 2112 are used to cooperate in a rolling compounding operation. The first protrusion 21112 and the second compounding roller 2112 are separated to form a rolling gap, and the first protrusion 21112 and the first rotating roller 21111 define a first avoidance space 2002, and the first avoidance space 2002 is connected to the rolling gap.

[0282] The first composite roller 2111 and the second composite roller 2112 are roller-shaped structures used to cooperate in the rolling operation. The first composite roller 2111 and the second composite roller 2112 are arranged in parallel, and the rotation direction of the first composite roller 2111 is opposite to the rotation direction of the second composite roller 2112.

[0283] The first rotating roller 21111 is a roller-shaped structure of the first composite roller 2111 , and the first convex portion 21112 refers to a component provided on the outer peripheral side of the first rotating roller 21111 for performing a rolling operation.

[0284] Along the distribution direction of the first composite roller 2111 and the second composite roller 2112, the first protrusion 21112 of the first composite roller 2111 is spaced from the outer periphery of the second composite roller 2112 to form a rolling gap. Furthermore, along the distribution direction of the first composite roller 2111 and the second composite roller 2112, the side of the first protrusion 21112 away from the first rotating roller 21111 is spaced from the first rotating roller 21111 to form a first avoidance space 2002.

[0285] The distribution direction of the first composite roll 2111 and the second composite roll 2112 is parallel to the radial direction of the first composite roll 2111 and the radial direction of the second composite roll 2112. Furthermore, the distribution direction of the first composite roll 2111 and the second composite roll 2112 is perpendicular to the axial direction of the first composite roll 2111 and the axial direction of the second composite roll 2112. Furthermore, the axial directions of the first composite roll 2111 and the second composite roll 2112 are parallel to the first direction Z. In other words, the distribution direction of the first composite roll 2111 and the second composite roll 2112 is perpendicular to the first direction Z.

[0286] During the composite operation, at least one of the first rotating roller 21111 and the second composite roller 2112 can be driven to rotate, and at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 are rolled through the rolling gap formed by the first protrusion 21112 and the second composite roller 2112, so that the first rotating roller 21111 and the second composite roller 2112 rotate in opposite directions, so that the first protrusion 21112 and the second composite roller 2112 cooperate to roll at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113, thereby achieving a composite fixing effect between at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113.

[0287] By providing a first protrusion 21112 on the outer circumference of the first rotating roller 21111 of the first composite roller 2111, the first protrusion 21112 cooperates with the second composite roller 2112 to perform a rolling operation. The first protrusion 21112 and the first rotating roller 21111 define a first avoidance space 2002 that communicates with the rolling gap. This allows the first protrusion 21112 to cooperate with the second composite roller 2112 to roll a portion of the integral body formed by at least one of the first and second electrode sheets 111, 112, and the diaphragm 113, while the remaining portion avoids the first avoidance space 2002 and is not subjected to the composite fixation operation. This improves the poor overall air permeability of the diaphragm 113, helps improve the ion conductivity of the diaphragm 113, and further helps improve the charge and discharge performance of the battery 100, thereby improving the dynamic performance of the battery 100.

[0288] It should be supplemented here that when a composite operation needs to be performed on one end portion of the integral body formed by at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 along the first direction Z, the first rotating roller 21111 is provided with the above-mentioned first protrusion 21112 at one end portion along the first direction Z. When a composite operation needs to be performed on both ends of the integral body formed by at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 along the first direction Z, the first rotating roller 21111 is provided with the above-mentioned first protrusion 21112 at both ends along the first direction Z.

[0289] In some embodiments, referring to FIG. 23 and in conjunction with other figures, the second composite roller 2112 includes a second rotating roller 21121 and a second protrusion 21122 disposed on the outer circumference of the second rotating roller 21121. The second protrusion 21122 is disposed opposite the first protrusion 21112, and the second protrusion 21122 and the second rotating roller 21121 define a second escape space 2003, which communicates with the rolling gap.

[0290] The second rotating roller 21121 is a roller-shaped structure of the second composite roller 2112 , and the second convex portion 21122 refers to a component provided on the outer peripheral side of the second rotating roller 21121 for performing a rolling operation.

[0291] Along the distribution direction of the first composite roller 2111 and the second composite roller 2112, the first convex portion 21112 of the first composite roller 2111 and the second convex portion 21122 of the second composite roller 2112 are opposite each other, forming a rolling gap. Furthermore, along the distribution direction of the first composite roller 2111 and the second composite roller 2112, the side of the second convex portion 21122 facing away from the second rotating roller 21121 is separated from the second rotating roller 21121 to form a second avoidance space 2003.

[0292] During the composite operation, the first protrusion 21112 and the second protrusion 21122 cooperate to roll at least one of the first pole piece 111 and the second pole piece 112 and a part of the whole formed by the diaphragm 113, and the other part is avoided in the first avoidance space 2002 and the second avoidance space 2003, so that part of the diaphragm 113 is not used for the composite operation, which can improve the problem of poor overall air permeability of the diaphragm 113, help to improve the ion conductivity of the diaphragm 113, and then help to improve the charge and discharge performance of the battery 100 single cell, so as to improve the dynamic performance of the battery 100 single cell.

[0293] It should be supplemented here that when a composite operation needs to be performed on one end portion of the integral body formed by at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 along the first direction Z, the second convex portion 21122 is provided at one end portion of the second rotating roller 21121 along the first direction Z. When a composite operation needs to be performed on both ends of the integral body formed by at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 along the first direction Z, the second convex portion 21122 is provided at both ends of the second rotating roller 21121 along the first direction Z.

[0294] In some embodiments, please refer to Figures 25 and 26 together, in conjunction with other figures. Figure 25 is a cross-sectional view of the first composite roller 2111 and the second composite roller 2112 of the composite mechanism 2110 of the composite device 2100 provided in some embodiments of the present application, while Figure 26 is a cross-sectional view of the first composite roller 2111 and the second composite roller 2112 of the composite mechanism 2110 of the composite device 2100 provided in other embodiments of the present application. Both Figures 25 and 26 are schematic diagrams of Figure 24 taken along the axial direction of the first composite roller 2111, and are also schematic diagrams of Figure 24 taken along the first direction Z. In some possible designs, as shown in Figure 25 , the first protrusions 21112 are continuously arranged along the circumference of the outer periphery of the first rotating roller 21111. Alternatively, in other possible designs, as shown in Figure 26 , the first protrusions 21112 are arranged at intervals along the circumference of the outer periphery of the first rotating roller 21111. Alternatively, in some other possible designs, the first rotating roller 21111 is provided with two groups of the above-mentioned first protrusions 21112, and the two groups of first protrusions 21112 are spaced apart on the first rotating roller 21111 along the first direction Z. One group of the first protrusions 21112 is continuously provided on the outer circumference of the first rotating roller 21111, and the other group of the first protrusions 21112 is spaced apart on the outer circumference of the first rotating roller 21111.

[0295] As shown in Figures 25 and 19, when the first protrusions 21112 are continuously arranged on the outer peripheral side of the first rotating roller 21111 along the circumferential direction. Taking the first pole piece 111 fixed to the diaphragm 113 as an example, the first composite structure a at each end of the first pole piece 111 along the first direction Z is continuously arranged. Among them, the first protrusions 21112 can be set as one group or as two groups. When the first protrusions 21112 are set as two groups, the two groups of first protrusions 21112 are arranged at intervals on the outer peripheral side of the first rotating roller 21111 along the first direction Z. Among them, the second pole piece 112 fixed to the diaphragm 113 can also be explained in the same way.

[0296] As shown in Figures 26 and 18, when multiple first protrusions 21112 are arranged at intervals along the circumferential direction on the outer peripheral side of the first rotating roller 21111. Taking the first pole piece 111 fixed to the diaphragm 113 as an example, the first composite structures a at each end of the first pole piece 111 along the first direction Z are arranged at intervals. Among them, the first protrusions 21112 can be set as one group or as two groups. When the first protrusions 21112 are set as two groups, the two groups of first protrusions 21112 are arranged at intervals along the first direction Z on the outer peripheral side of the first rotating roller 21111. Among them, the second pole piece 112 fixed to the diaphragm 113 can also be explained in the same way.

[0297] Two groups of first protrusions 21112 are spaced apart on the first rotating roller 21111 along the first direction Z, wherein one group of first protrusions 21112 is continuously arranged on the outer periphery of the first rotating roller 21111, and the other group of first protrusions 21112 is spaced apart on the outer periphery of the first rotating roller 21111. It can be understood that both ends of the first rotating roller 21111 along the first direction Z are provided with first protrusions 21112. The first protrusions 21112 at one end of the first rotating roller 21111 along the first direction Z are continuously provided along the circumferential direction on the outer circumference of the first rotating roller 21111, and the first protrusions 21112 at the other end of the first rotating roller 21111 along the first direction Z are spaced apart along the circumferential direction on the outer circumference of the first rotating roller 21111. Taking the first pole piece 111 being compositely fixed to the diaphragm 113 as an example, the first composite structure a at one end of the first pole piece 111 along the first direction Z is continuously provided, and the first composite structures a at the other end of the first pole piece 111 along the first direction Z are spaced apart, as shown in FIG20. The composite structure a of the second pole piece 112 being compositely fixed to the diaphragm 113 can be explained in the same way.

[0298] It should be noted here that the first protrusions 21112 are circumferentially spaced apart on the outer peripheral side of the first rotating roller 21111 and a group of first protrusions 21112 are spaced apart on the outer peripheral side of the first rotating roller 21111 refer to multiple first protrusions 21112 being spaced apart on the outer peripheral side of the first rotating roller 21111.

[0299] Such arrangement can make the first composite structure a formed after the composite operation arranged continuously or at intervals, and can also make the second composite structure b formed after the composite operation arranged continuously or at intervals, thereby making the composite effect very flexible.

[0300] In some embodiments, please refer to Figures 25 and 26 together, and in conjunction with other figures. In some possible designs, as shown in Figure 25, the second protrusions 21122 are continuously arranged along the circumference of the outer circumference of the second rotating roller 21121. Alternatively, in other possible designs, as shown in Figure 26, the second protrusions 21122 are spaced apart along the circumference of the second rotating roller 21121. Alternatively, in still other possible designs, the second rotating roller 21121 is provided with two sets of the above-mentioned second protrusions 21122, the two sets of second protrusions 21122 being spaced apart along the first direction Z on the second rotating roller 21121. One set of the second protrusions 21122 is continuously arranged along the outer circumference of the second rotating roller 21121, while the other set of the second protrusions 21122 is spaced apart along the outer circumference of the second rotating roller 21121.

[0301] As shown in Figures 25 and 19, when the second protrusions 21122 are continuously arranged on the outer peripheral side of the second rotating roller 21121 along the circumferential direction. Taking the first pole piece 111 fixed to the diaphragm 113 as an example, the first composite structure a of each end of the first pole piece 111 along the first direction Z is continuously arranged. Among them, the second protrusions 21122 can be set as one group or as two groups. When the second protrusions 21122 are set as two groups, the two groups of second protrusions 21122 are arranged at intervals on the outer peripheral side of the second rotating roller 21121 along the first direction Z. Among them, the second pole piece 112 fixed to the diaphragm 113 can also be explained in the same way.

[0302] As shown in Figures 26 and 18, when multiple second protrusions 21122 are arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller 21121. Taking the first pole piece 111 fixed to the diaphragm 113 as an example, the first composite structure a at each end of the first pole piece 111 along the first direction Z is arranged at intervals. Among them, the second protrusions 21122 can be set as one group or as two groups. When the second protrusions 21122 are set as two groups, the two groups of second protrusions 21122 are arranged at intervals along the first direction Z on the outer peripheral side of the second rotating roller 21121. Among them, the second pole piece 112 fixed to the diaphragm 113 can also be explained in the same way.

[0303] Two groups of second protrusions 21122 are spaced apart along the first direction Z on the second rotating roller 21121 , wherein one group of second protrusions 21122 is continuously arranged on the outer periphery of the second rotating roller 21121 , and the other group of second protrusions 21122 is spaced apart on the outer periphery of the second rotating roller 21121 . It can be understood that the second rotating roller 21121 is provided with a second protrusion 21122 at both ends along the first direction Z. The second protrusion 21122 at one end of the second rotating roller 21121 along the first direction Z is continuously provided along the circumferential direction on the outer circumference of the first rotating roller 21111, and the second protrusion 21122 at the other end of the second rotating roller 21121 along the first direction Z is provided at intervals along the circumferential direction on the outer circumference of the second rotating roller 21121. Taking the first pole piece 111 being compositely fixed to the diaphragm 113 as an example, the first composite structure a of the first pole piece 111 at one end along the first direction Z is continuously provided, and the first composite structure a of the other end of the first pole piece 111 along the first direction Z is provided at intervals, as shown in FIG20 . The composite structure a of the second pole piece 112 being compositely fixed to the diaphragm 113 can be explained in the same way.

[0304] It should be noted here that the second protrusions 21122 are circumferentially spaced apart on the outer peripheral side of the second rotating roller 21121, and a group of second protrusions 21122 are spaced apart on the outer peripheral side of the second rotating roller 21121, both refer to multiple second protrusions 21122 being spaced apart on the outer peripheral side of the second rotating roller 21121.

[0305] Such arrangement can make the first composite structure a formed after the composite operation arranged continuously or at intervals, and can also make the second composite structure b formed after the composite operation arranged continuously or at intervals, thereby making the composite effect very flexible.

[0306] Based on the above structure, it can be understood that the first composite roller 2111 and the second composite roller 2112 cooperate to enable the composite device 2100 to perform a composite operation by rolling, wherein the rolling method can be cold pressing or hot pressing.

[0307] Please refer to Figures 12 and 27 together, and in conjunction with the other accompanying drawings. Figure 27 is a schematic diagram of a processing device 2000 provided in some embodiments of the present application. The processing device 2000 provided in the embodiments of the present application is used to process a battery 100, and the processing device 2000 includes a composite device 2100. The composite device 2100 in this embodiment is the same as the composite device 2100 in the previous embodiment. For details, please refer to the relevant description of the composite device 2100 in the previous embodiment, which will not be repeated here.

[0308] The processing equipment 2000 provided in the embodiment of the present application, by adopting the composite device 2100 involved above, helps to improve the charge and discharge performance of the battery 100, thereby improving the dynamic performance of the battery 100.

[0309] In some embodiments, please refer to FIG. 12 and FIG. 27 together with other drawings. The processing equipment 2000 further includes a winding device 2200 for winding the first electrode sheet 111 , the second electrode sheet 112 and the separator 113 to form the electrode assembly 11 .

[0310] The winding device 2200 is a device for winding the first electrode sheet 111 , the second electrode sheet 112 and the separator 113 to form the electrode assembly 11 .

[0311] With such arrangement, the electrode assembly 11 can be wound.

[0312] In some embodiments, please refer to FIG. 13 and FIG. 27 together with other drawings. The processing equipment 2000 further includes a shaping device 2300 , which is used to shape the electrode assembly 11 into a flat shape.

[0313] The shaping device 2300 is a device for shaping the electrode assembly 11 into a flat shape.

[0314] With such configuration, a flat electrode assembly 11 can be obtained.

[0315] In some embodiments, referring to FIG. 27 and in conjunction with other figures, the processing apparatus 2000 further includes an assembly device 2400 and a stacking device 2500 . The assembly device 2400 is used to assemble the electrode assemblies 11 to form a battery 100 unit, and the stacking device 2500 is used to stack the battery 100 units to form a battery 100 .

[0316] The assembling device 2400 is a device for assembling the electrode assembly 11 and the housing to form a single battery 100 , and the stacking device 2500 is a device for stacking a plurality of single batteries 100 to form a battery 100 .

[0317] With such configuration, the battery 100 can be obtained.

[0318] Please refer to Figure 28, in conjunction with the other accompanying drawings. Figure 28 is a flow chart of the composite method provided in some embodiments of the present application. The composite method provided in the embodiments of the present application utilizes a composite device 2100. The composite device 2100 in this embodiment is the same as the composite device 2100 in the previous embodiment. For details, please refer to the relevant description of the composite device 2100 in the previous embodiment, which will not be repeated here.

[0319] The composite method involved in the embodiment of the present application includes the following steps:

[0320] S10 , driving the composite device 2100 to composite and fix a portion of the diaphragm 113 to the first pole piece 111 and / or the second pole piece 112 .

[0321] Specifically, at least one of the first electrode piece 111 and the second electrode piece 112 and the diaphragm 113 can be passed through the composite device 2100 as needed, so that the composite device 2100 composites the part of the whole formed by at least one of the first electrode piece 111 and the second electrode piece 112 and the diaphragm 113, thereby performing a composite operation on the part of the diaphragm 113.

[0322] The composite device 2100 can perform a composite operation on at least one of the first electrode 111 and the second electrode 112 and the diaphragm 113 through a composite mechanism 2110 , or can perform a composite operation on at least one of the first electrode 111 and the second electrode 112 and the diaphragm 113 through multiple composite mechanisms 2110 .

[0323] The composite method provided in the embodiment of the present application, by adopting the composite device 2100 involved above, can only perform the composite operation on one part of the diaphragm 113, so that the other parts of the diaphragm 113 are not used for the composite operation. This can improve the problem of poor overall air permeability of the diaphragm 113, help improve the ion conductivity of the diaphragm 113, and further help improve the charge and discharge performance of the battery 100 single cell, so as to improve the dynamic performance of the battery 100 single cell.

[0324] In some embodiments, driving the composite device 2100 to composite and fix a portion of the diaphragm 113 to the first pole piece 111 and / or the second pole piece 112 (step S10) specifically includes the following steps:

[0325] S11. Drive the first composite roller 2111 to rotate; or drive the second composite roller 2112 to rotate; or drive the first composite roller 2111 and the second composite roller 2112 to rotate, so that the first protrusion 21112 on the first composite roller 2111 cooperates with the second composite roller 2112 to roll at least one of the first electrode sheet 111 and the second electrode sheet 112 and the diaphragm 113.

[0326] Such an arrangement allows the composite device 2100 to perform a rolling operation through the cooperation of the first composite roller 2111 and the second composite roller 2112, so that the other parts of the diaphragm 113 are not used for the composite operation. This can improve the problem of poor overall air permeability of the diaphragm 113, help improve the ion conductivity of the diaphragm 113, and further help improve the charge and discharge performance of the battery 100 single cell, thereby improving the dynamic performance of the battery 100 single cell.

[0327] In some embodiments, before driving the composite device 2100 to composite a portion of the diaphragm 113 onto the first pole piece 111 and / or the second pole piece 112 (step S10), the process further includes:

[0328] S20. Dispose a first adhesive layer 12 on the diaphragm 113; and / or, dispose a second adhesive layer on the first electrode 111; and / or, dispose a third adhesive layer on the second electrode 112. It is understood that disposing the first adhesive layer 12 on the diaphragm 113, disposing the second adhesive layer on the first electrode 111, and disposing the third adhesive layer on the second electrode 112 can be freely selected and combined according to needs.

[0329] It is understandable that the example of providing the first adhesive layer 12 on the diaphragm 113 is used for explanation: in some possible designs, the diaphragm 113 can be immersed in a glue tank so that the glue in the glue tank is retained on the diaphragm 113 and solidified to form the first adhesive layer 12. In other possible designs, the first adhesive layer 12 can also be applied to the diaphragm 113. In still other possible designs, the first adhesive layer 12 can also be bonded to the diaphragm 113. Correspondingly, the method of providing the second adhesive layer on the first electrode 111 and the third adhesive layer on the second electrode 112 can also adopt a similar solution, which will not be repeated here.

[0330] With this arrangement, the first adhesive layer 12 can be first provided on the diaphragm 113, and / or the second adhesive layer can be provided on the first electrode piece 111, and / or the third adhesive layer can be provided on the second electrode piece 112. Then, at least one of the first electrode piece 111 and the second electrode piece 112 and the diaphragm 113 are passed through the composite device 2100, so that the composite device 2100 composites at least one of the first electrode piece 111 and the second electrode piece 112 and the diaphragm 113, thereby achieving a partially completed composite operation of the diaphragm 113. In this way, the diaphragm 113 can achieve a relatively secure composite fixation effect.

[0331] As one of the embodiments of the present application, as shown in Figures 3, 4, 7 to 9, a battery cell 100 includes an electrode assembly 11. The electrode assembly 11 includes a first electrode sheet 111, a second electrode sheet 112, a first separator 113a, and a second separator 113b. The first separator 113a, the first electrode sheet 111, the second separator 113b, and the second electrode sheet 112 are stacked and wound in sequence. The first electrode sheet 111 includes a first current collector 1111 and a first active layer 1112 disposed on the first current collector 1111. The second electrode sheet 112 includes a second current collector 1121, a second active layer 1122, and an insulating layer 1123. The second active layer 1122 and the insulating layer 1123 are both disposed on the second current collector 1121, and the insulating layer 1123 is located at one end of the second active layer 1122 along the first direction Z. The first active layer 1112 extends beyond opposite ends of the second active layer 1122 along the first direction Z, and the insulating layer 1123 extends beyond one end of the first active layer 1112 along the first direction Z. The first diaphragm 113a and the second diaphragm 113b both include a first film material 1131 and a second film material 1132. The second film material 1132 is disposed at opposite ends of the first film material 1131 along the first direction Z. The first film material 1131 is disposed opposite the second active layer 1122, and the first film material 1131 is disposed opposite a portion of the first active layer 1112. The second film material 1132 at opposite ends of the first diaphragm 113a along the first direction Z is both compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z. The second film material 1132 of the second diaphragm 113b has one side compositely fixed to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z, and the other side compositely fixed to the insulating layer 1123. Furthermore, the second film materials 1132 at two opposite ends of the second diaphragm 113 b along the first direction Z are compositely fixed to a portion of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z.

[0332] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A battery cell (10), wherein: The invention comprises an electrode assembly (11), wherein the electrode assembly (11) comprises a first pole piece (111), a second pole piece (112) and a diaphragm (113), wherein the first pole piece (111) and the second pole piece (112) are alternately stacked or alternately stacked and wound; at least a portion of the diaphragm (113) is arranged between the first pole piece (111) and the second pole piece (112), and a portion of the diaphragm (113) is compositely fixed to the first pole piece (111) and / or the second pole piece (112).

2. The battery cell (10) according to claim 1, wherein: The first pole piece (111) comprises a first current collector (1111) and a first active layer (1112) arranged on the first current collector (1111); the second pole piece (112) comprises a second current collector (1121) and a second active layer (1122) arranged on the second current collector (1121); the diaphragm (113) comprises a first film material (1131) and a second film material (1132) arranged on the end side of the first film material (1131) along the first direction (Z); The film material (1131) is respectively arranged opposite to the first active layer (1112) and the second active layer (1122); the second film material (1132) is located outside the end side of the first active layer (1112) and / or the second active layer (1122) along the first direction (Z), and is at least partially compositely fixed to the first pole piece (111) and / or the second pole piece (112); the first direction (Z) is parallel to the first pole piece (111) and the second pole piece (112).

3. The battery cell (10) according to claim 2, wherein: The first active layer (1112) extends beyond the second active layer (1122) along the first direction (Z), and the second film material (1132) is located outside the end side of the second active layer (1122) along the first direction (Z).

4. The battery cell (10) according to claim 3, wherein: At least a portion of the second film material (1132) is compositely fixed to a portion of the first active layer (1112) that extends beyond the second active layer (1122) along the first direction (Z).

5. The battery cell (10) according to claim 4, wherein: At least one side or two opposite sides of the first active layer (1112) extending beyond the second active layer (1122) along the first direction (Z) are compositely fixed to the second film material (1132).

6. The battery cell (10) according to claim 4 or 5, wherein: The portion of the first active layer (1112) that extends beyond one end of the second active layer (1122) along the first direction (Z) is compositely fixed to the second film material (1132); or, the portion of the first active layer (1112) that extends beyond the opposite ends of the second active layer (1122) along the first direction (Z) is compositely fixed to the second film material (1132).

7. The battery cell (10) according to any one of claims 3 to 6, wherein: The second pole piece (112) also includes an insulating layer (1123) arranged on the second current collector (1121), and the insulating layer (1123) is arranged on the end side of the second active layer (1122) along the first direction (Z), and extends beyond the first active layer (1112) along the first direction (Z), and is opposite to the second film material (1132).

8. The battery cell (10) according to claim 7, wherein: At least a portion of the second film material (1132) is compositely fixed to the insulating layer (1123).

9. The battery cell (10) according to claim 8, wherein: At least one side or two opposite sides of a portion of the insulating layer (1123) are compositely fixed to the second film material (1132).

10. The battery cell (10) according to any one of claims 7 to 9, wherein: The second current collector (1121) is provided with a second pole ear (11211), and the second pole ear (11211) is located outside one end of the second active layer (1122) along the first direction (Z); in the first direction (Z), the insulating layer (1123) is located between the second active layer (1122) and the second pole ear (11211).

11. The battery cell (10) according to any one of claims 2 to 10, wherein: The first current collector (1111) is provided with a first pole ear (11111), and the first pole ear (11111) is arranged at one end of the first active layer (1112) along the first direction (Z); the second current collector (1121) is provided with a second pole ear (11211); the second pole ear (11211) is located at one end of the second active layer (1122) along the first direction (Z) close to the first pole ear (11211), or the second pole ear (11211) is located at one end of the second active layer (1122) along the first direction (Z) away from the first pole ear (11111).

12. The battery cell (10) according to any one of claims 2 to 11, wherein: At least one side of a portion of the second film material (1132) is compositely fixed to the first pole piece (111) or the second pole piece (112); And / or, at least part of the second film material (1132) has two opposite sides compositely fixed to the first pole piece (111) and the second pole piece (112), respectively.

13. The battery cell (10) according to any one of claims 2 to 12, wherein: The second film material (1132) is provided at both opposite ends of the first film material (1131) along the first direction (Z), and the second film material (1132) at each end of the first film material (1131) along the first direction (Z) is compositely fixed to the first pole piece (111) and / or the second pole piece (112).

14. The battery cell (10) according to any one of claims 2 to 13, wherein: The second film material (1132) and the first pole piece (111) are combined to form a first composite structure (a); the first composite structures (a) at each end of the first pole piece (111) in the first direction (Z) are arranged at intervals or continuously, or the first pole piece (111) is formed with two groups of the first composite structures (a) distributed at intervals along the first direction (Z), one group of the first composite structures (a) is arranged at intervals, and the other group of the first composite structures (a) is arranged continuously.

15. The battery cell (10) according to any one of claims 2 to 14, wherein: The second film material (1132) and the second pole piece (112) are combined to form a second composite structure (b), and the second composite structure (b) is arranged at intervals or continuously.

16. The battery cell (10) according to any one of claims 1 to 15, wherein: The diaphragm (113) comprises a substrate (1133) and adhesive layers (1134) arranged on opposite sides of the substrate (1133); the diaphragm (113) is bonded to the first pole piece (111) and / or the second pole piece (112) through the adhesive layer (1134) to be compositely fixed to the first pole piece (111) and / or the second pole piece (112); And / or, the electrode assembly (11) further comprises a first adhesive layer (12) arranged on the diaphragm (113), and the diaphragm (113) is bonded to the first pole piece (111) and / or the second pole piece (112) through the first adhesive layer (12) so as to be compositely fixed to the first pole piece (111) and / or the second pole piece (112); And / or, the electrode assembly (11) further comprises a second adhesive layer provided on the first electrode piece (111), and the first electrode piece (111) is bonded to the diaphragm (113) via the second adhesive layer so as to be compositely fixed to the diaphragm (113); And / or, the electrode assembly (11) further comprises a third adhesive layer disposed on the second pole piece (112), and the second pole piece (112) is bonded to the diaphragm (113) via the third adhesive layer so as to be compositely fixed to the diaphragm (113).

17. The battery cell (10) according to any one of claims 1 to 16, wherein: The first pole sheet (111) and the second pole sheet (112) are stacked and wound, and the electrode assembly (11) is flat or cylindrical.

18. A battery (100), wherein: Comprising a battery cell (10) according to any one of claims 1 to 17.

19. An electrical device, wherein: The method comprises a battery cell (10) according to any one of claims 1 to 17 or a battery (100) according to claim 18.

20. A composite device (2100), applied to a battery cell (10) according to any one of claims 1 to 17; wherein: The composite device (2100) is used to composite and fix part of the diaphragm (113) to the first pole piece (111) and / or the second pole piece (112).

21. The composite device (2100) according to claim 20, wherein: The composite device (2100) comprises a composite mechanism (2110) for performing composite operations; the number of the composite mechanism (2110) is one, or the number of the composite mechanism (2110) is multiple, and the multiple composite mechanisms (2110) are used to perform composite operations in sequence.

22. The composite device (2100) according to claim 21, wherein: The composite mechanism (2110) comprises a first composite roller (2111) and a second composite roller (2112); the first composite roller (2111) comprises a first rotating roller (21111) and a first convex portion (21112) arranged on the outer peripheral side of the first rotating roller (21111); the first convex portion (21112) and the second composite roller (2112) are used to cooperate in a rolling composite operation; the first convex portion (21112) and the second composite roller (2112) are spaced to form a rolling gap (2001); and the first convex portion (21112) and the first rotating roller (21111) define a first avoidance space (2002) connected to the rolling gap (2001).

23. The composite device (2100) according to claim 22, wherein: The second composite roller (2112) comprises a second rotating roller (21121) and a second convex portion (21122) arranged on the outer periphery of the second rotating roller (21121); the second convex portion (21122) and the first convex portion (21112) are arranged opposite to each other and are spaced apart to form the rolling gap (2001); the second convex portion (21122) and the second rotating roller (21121) define a second avoidance space (2003) connected to the rolling gap (2001).

24. The composite device (2100) according to claim 22 or 23, wherein: The first protrusions (21112) are continuously arranged along the circumferential direction on the outer peripheral side of the first rotating roller (21111); or, the first protrusions (21112) are arranged at intervals along the circumferential direction on the outer peripheral side of the first rotating roller (21111); or, the first rotating roller (21111) is provided with two groups of first protrusions (21112) distributed at intervals, wherein one group of the first protrusions (21112) is continuously arranged along the circumferential direction on the outer peripheral side of the first rotating roller (21111), and the other group of the first protrusions (21112) are arranged at intervals along the circumferential direction on the outer peripheral side of the first rotating roller (21111).

25. The composite device (2100) according to claim 23, wherein: The second protrusions (21122) are continuously arranged along the circumferential direction on the outer peripheral side of the second rotating roller (21121); or, the second protrusions (21122) are arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller (21121); or, the second rotating roller (21121) is provided with two groups of second protrusions (21122) distributed at intervals, wherein one group of the second protrusions (21122) is continuously arranged along the circumferential direction on the outer peripheral side of the second rotating roller (21121), and the other group of the second protrusions (21122) is arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller (21121).

26. A processing device (2000) for processing a battery (100); wherein: The processing equipment (2000) comprises the composite device (2100) according to any one of claims 20-25.

27. The processing device (2000) according to claim 26, wherein: The processing equipment (2000) also includes: A winding device (2200) is used for winding the first pole piece (111), the second pole piece (112) and the separator (113) to form the electrode assembly (11).

28. The processing device (2000) according to claim 27, wherein: The processing equipment (2000) further comprises a shaping device (2300), wherein the shaping device (2300) is used to shape the electrode assembly (11) into a flat shape.

29. The processing device (2000) according to claim 27 or 28, wherein: The processing equipment (2000) also includes: An assembling device (2400) for assembling the electrode assembly (11) to form the battery cell (10); A stacking device (2500) is used to stack the battery cells (10) to form a battery (100).

30. A composite method, using the composite device (2100) according to any one of claims 20 to 25, wherein: The composite method comprises: The composite device (2100) is driven to composite and fix a portion of the diaphragm (113) to the first pole piece (111) and / or the second pole piece (112).

31. The composite method according to claim 30, wherein: The driving of the composite device (2100) to composite and fix part of the diaphragm (113) to the first pole piece (111) and / or the second pole piece (112) comprises: The first composite roller (2111) and / or the second composite roller (2112) are driven to rotate so that the first protrusion (21112) on the first composite roller (2111) cooperates with the second composite roller (2112) to roll at least one of the first pole piece (111) and the second pole piece (112) and the diaphragm (113).

32. The composite method according to claim 30 or 31, wherein: Before the said driving the composite device (2100) to composite part of the said diaphragm (113) with the said first pole piece (111) and / or the said second pole piece (112), the said method further comprises: A first glue layer (12) is provided on the diaphragm (113), and / or a second glue layer is provided on the first pole piece (111), and / or a third glue layer is provided on the second pole piece (112).

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