Battery monomer, battery, power utilization device, compounding device and method, and processing equipment

Abstract

The invention is applicable to the technical field of batteries, and provides a battery monomer, a battery, a power utilization device, a composite device, a method and processing equipment, and the processing equipment is used for processing the battery and comprises the composite device. The compounding method comprises the step of driving the compounding device to compound and fix part of the diaphragm on the first pole piece and / or the second pole piece. The power utilization device comprises a battery, the battery comprises a battery monomer, the battery monomer comprises an electrode assembly, and the electrode assembly comprises a first pole piece, a second pole piece and a diaphragm. The first pole pieces and the second pole pieces are alternately laminated or alternately laminated and wound; at least part of the diaphragm is arranged between the first pole piece and the second pole piece, and part of the diaphragm is compounded and fixed on the first pole piece and / or the second pole piece. Therefore, only one part of the diaphragm is used for compounding operation, and the other part of the diaphragm is not used for compounding operation, so that the problem of poor overall air permeability of the diaphragm can be improved, the ion conduction capability of the diaphragm is favorably improved, and the dynamic performance of the battery monomer is improved.

Description

Technical Field

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

[0002] In the related art, a battery cell may generally include a housing and an electrode assembly disposed in the housing, wherein the electrode assembly is mainly formed by stacking or stacking and winding a positive electrode sheet and a negative electrode sheet, and a separator is disposed between the positive electrode sheet and the negative electrode sheet.

[0003] In some cases, during the processing of battery cells, it is necessary to provide a large pressure on the positive electrode sheet, the negative electrode sheet and the separator to perform the composite operation so that the separator is composited and fixed to the positive electrode sheet and the negative electrode sheet as a whole. However, during the composite process, the separator as a whole will be subjected to a large pressure, which will affect the permeability of the separator, thereby affecting the charge and discharge performance of the battery cell, thereby affecting the dynamic performance of the battery cell. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide a battery cell, a battery, an electrical device, a composite device and method, and a processing equipment, which can improve the technical problem of poor air permeability of the diaphragm.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, including an electrode assembly, the electrode assembly including a first pole sheet, a second pole sheet and a diaphragm, the first pole sheet and the second pole sheet are alternately stacked or alternately stacked and wound; at least a portion of the diaphragm is disposed between the first pole sheet and the second pole sheet, and a portion of the diaphragm is compositely fixed to the first pole sheet and / or the second pole sheet.

[0006] The battery cell provided in the embodiment of the present application is provided by fixing part of the diaphragm to the first pole piece by compounding; or fixing part of the diaphragm to the second pole piece by compounding; or fixing part of the diaphragm to the first pole piece and the second pole piece by compounding. In this way, only part of the diaphragm is used for compounding operation, and the other part of the diaphragm is not used for compounding operation, which 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, so as to improve the dynamic performance of the battery cell.

[0007] In some embodiments, the first pole piece includes a first current collector and a first active layer arranged on the first current collector, and the second pole 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, 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 pole piece and / or the second pole piece; the first direction is parallel to the first pole piece and the second pole piece.

[0008] 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 to improve the dynamic performance of the battery cell.

[0009] 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.

[0010] In this way, the problem that ions cannot be completely embedded in the first active layer after escaping from the second active layer can be improved, and the problems of ion accumulation outside the first and second active layers and puncturing the diaphragm, ion precipitation, etc. can be improved.

[0011] 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.

[0012] In this way, the composite fixation of the second film material of the diaphragm and the first pole piece is achieved, the insulation between the diaphragm and the first pole piece and the second pole piece can be maintained, and 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 is improved.

[0013] 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.

[0014] In this way, the composite operation of the second membrane material and the portion of the first active layer extending beyond the second active layer is very flexible.

[0015] 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.

[0016] In this way, the first active layer can effectively deintercalate ions, thereby improving the charge and discharge performance of the battery cell, thereby improving the dynamic performance of the battery cell. Alternatively, the composite fixing effect of the separator on the electrode assembly can be improved.

[0017] 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.

[0018] 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.

[0019] In some embodiments, at least a portion of the second film material is compositely fixed to the insulating layer.

[0020] In this way, the diaphragm can effectively achieve insulation between the first pole piece and the second pole piece, thereby improving the overlap problem between the first active layer and the second current collector, that is, improving the self-discharge problem of the electrode assembly caused by the overlap between the first pole piece and the second pole piece.

[0021] 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.

[0022] 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.

[0023] In some embodiments, the second current collector is provided with a second pole tab, and the second pole tab 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 pole tab.

[0024] 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.

[0025] In some embodiments, the first current collector is provided with a first pole ear, and the first pole ear 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 ear; the second pole ear is located at one end of the second active layer along the first direction close to the first pole ear, or the second pole ear is located at one end of the second active layer along the first direction away from the first pole ear.

[0026] 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 ear along the first direction to achieve insulation between the second current collector and the first active layer, thereby improving the problem of the end of the first active layer piercing the diaphragm and overlapping the second current collector.

[0027] 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;

[0028] 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.

[0029] Such an arrangement makes the composite operation of the second film material on the electrode assembly very flexible.

[0030] In some embodiments, the second film material is disposed 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.

[0031] In this way, the problem of the diaphragm being unable to wrap the pole piece due to folding, causing the first pole piece and the second pole 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 pole piece and the second pole piece can be better maintained.

[0032] In some embodiments, the second film material is composited with the first pole piece to form a first composite structure; the first composite structures at each end of the first pole piece in the first direction are arranged at intervals or continuously, or the first pole piece forms two groups of first composite structures spaced apart and distributed 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.

[0033] By adopting the above technical solution, the composite operation of the first pole piece and the second film material is very flexible.

[0034] 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.

[0035] By adopting the above technical solution, the composite operation of the second pole piece and the second film material is very flexible.

[0036] In some embodiments, the diaphragm includes a substrate and an adhesive layer disposed on opposite sides of the substrate, and the diaphragm is bonded to the first pole piece and / or the second pole piece through the adhesive layer to be compositely fixed to the first pole piece and / or the second pole piece;

[0037] And / or, the electrode assembly further comprises a first adhesive layer disposed on the diaphragm, and the diaphragm is bonded to the first pole piece and / or the second pole piece through the first adhesive layer to be compositely fixed to the first pole piece and / or the second pole piece;

[0038] And / or, the electrode assembly further includes a second adhesive layer disposed on the first electrode piece, and the first electrode piece is bonded to the diaphragm through the second adhesive layer to be compositely fixed to the diaphragm;

[0039] And / or, the electrode assembly further includes a third adhesive layer disposed on the second electrode piece, and the second electrode piece is bonded to the diaphragm through the third adhesive layer to be compositely fixed to the diaphragm.

[0040] By adopting the above technical solution, during the composite operation, the diaphragm can achieve the composite fixation effect by bonding.

[0041] In some embodiments, the first pole sheet and the second pole sheet are stacked and wound, and the electrode assembly is flat or cylindrical.

[0042] In this way, the adhesive layer on the separator 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 charging and discharging process of the battery cell.

[0043] In a second aspect, an embodiment of the present application provides a battery, including a battery cell.

[0044] 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 composite operation, and the other part of the diaphragm is not used for 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, so as to improve the dynamic performance of the battery cell.

[0045] In a third aspect, an embodiment of the present application provides an electrical device, including a battery cell or a battery.

[0046] The electric device provided in the embodiment of the present application, by adopting the battery cells or batteries involved above, helps to improve the charging and discharging performance of the battery cells, so as to improve the dynamic performance of the battery cells, thereby improving the reliability of the electric device.

[0047] 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.

[0048] 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 part of the diaphragm is 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, so as to improve the dynamic performance of the battery cell.

[0049] In some embodiments, the composite device includes a composite mechanism for performing composite operations; the number of the composite mechanism is one, or the number of the composite mechanism is multiple, and the multiple composite mechanisms are used to perform the composite operations in sequence.

[0050] 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.

[0051] 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 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.

[0052] In this way, part of the diaphragm is not used for 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.

[0053] In some embodiments, the second composite roller includes a second rotating roller and a second protrusion arranged on the outer circumference of the second rotating roller, the second protrusion is arranged opposite to the first protrusion and separated to form a rolling gap; the second protrusion and the second rotating roller define a second avoidance space connected to the rolling gap.

[0054] In this way, parts of the membrane can be made unavailable for the compounding operation.

[0055] 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.

[0056] Such 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, so that the composite effect can be very flexible.

[0057] 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 first protrusions spaced apart along the first direction, 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 is arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller.

[0058] Such 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, so that the composite effect can be very flexible.

[0059] In a fifth aspect, an embodiment of the present application provides a processing equipment including a composite device.

[0060] The processing equipment provided in the embodiment of the present application, by adopting the composite device involved above, helps to improve the charging and discharging performance of the battery, so as to improve the dynamic performance of the battery.

[0061] In some embodiments, the processing equipment further comprises:

[0062] The winding device is used to wind the first pole piece, the second pole piece and the diaphragm to form an electrode assembly.

[0063] With such arrangement, an electrode assembly can be obtained by winding.

[0064] In some embodiments, the processing equipment further includes a shaping device for shaping the electrode assembly into a flat shape.

[0065] With such arrangement, a flat electrode assembly can be obtained.

[0066] In some embodiments, the processing equipment further comprises:

[0067] An assembly device for assembling the electrode assembly to form a battery cell;

[0068] A stacking device is used to stack battery cells to form a battery.

[0069] With this arrangement, a battery can be obtained.

[0070] In a sixth aspect, an embodiment of the present application provides a composite method, using a composite device, including:

[0071] The driving compound device composites and fixes part of the diaphragm to the first pole piece and / or the second pole piece.

[0072] The composite method provided in the embodiment of the present application, by adopting the composite device involved above, can only perform the composite operation on one part of the diaphragm, so that the other part of the diaphragm is 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, so as to improve the kinetic performance of the battery cell.

[0073] In some embodiments, the driving compound device to compound and fix a portion of the diaphragm to the first pole piece and / or the second pole piece comprises:

[0074] The first composite roller and / or the second composite roller are driven to rotate, so that the first convex portion on the first composite roller cooperates with the second composite roller to roll at least one of the first pole piece and the second pole piece and the diaphragm.

[0075] Such arrangement enables the composite device to perform a rolling operation through the cooperation of the first composite roller and the second composite roller, so that the other parts of the diaphragm are not used for the composite operation.

[0076] In some embodiments, before the driving compound device compounds part of the diaphragm with the first pole piece and / or the second pole piece, it also includes:

[0077] A first glue layer is provided on the diaphragm, and / or a second glue layer is provided on the first pole piece, and / or a third glue layer is provided on the second pole piece.

[0078] In this way, the diaphragm can achieve a more reliable composite fixing effect.

[0079] 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

[0080] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0081] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0082] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0083] Figure 3 A front view of an electrode assembly of a battery cell provided in some embodiments of the present application;

[0084] Figure 4 for Figure 3 A top view of

[0085] Figure 5 Schematic diagram of an electrode assembly of a battery cell provided in some other embodiments of the present application;

[0086] Figure 6 for Figure 5 Sectional view along AA;

[0087] Figure 7 for Figure 3 Sectional view along BB;

[0088] Figure 8 for Figure 3 A schematic diagram of a first diaphragm, a first pole piece, a second diaphragm and a second pole piece of an electrode assembly after being stacked and before being wound;

[0089] Fig. 9 for Figure 8 Cross-sectional view along CC;

[0090] Fig.10 for Fig. 9 A schematic diagram of the structure shown in another embodiment;

[0091] Fig.11 for Fig. 9 A schematic diagram of the structure shown in yet another embodiment;

[0092] Fig.12 A partial schematic diagram of a processing device provided for some embodiments of the present application;

[0093] Fig.13 for Fig.12 A schematic diagram of the resulting electrode assembly;

[0094] Fig.14 for Fig.12 A schematic diagram of processing an electrode assembly by a shaping device of a processing equipment shown;

[0095] Fig.15 for Fig.14 A schematic diagram of the resulting electrode assembly;

[0096] Fig.16 for Fig. 9 A schematic diagram of the structure shown in yet another embodiment;

[0097] Fig.17 for Fig. 9 A schematic diagram of the structure shown in yet another embodiment;

[0098] Fig.18 for Figure 3 A schematic diagram of the first pole piece and the separator of the electrode assembly after being stacked and before being wound;

[0099] Fig.19 for Fig.18 A schematic diagram of the structure shown in another embodiment;

[0100] Fig. 20 for Fig.18 A schematic diagram of the structure shown in yet another embodiment;

[0101] Fig.21 for Figure 3 A schematic diagram of the second pole piece and the separator of the electrode assembly after being stacked and before being wound;

[0102] Fig. 22 for Figure 3 A schematic diagram of the structure shown in another embodiment;

[0103] Fig.23 A schematic diagram of a composite device provided for some embodiments of the present application;

[0104] Fig.24 A schematic diagram of a composite mechanism of a composite device provided in some embodiments of the present application;

[0105] Fig.25 A cross-sectional view of a composite mechanism of a composite device provided in some embodiments of the present application;

[0106] Fig.26 A cross-sectional view of a composite mechanism of a composite device provided in some other embodiments of the present application;

[0107] Fig. 27 A schematic diagram of a processing device provided for some embodiments of the present application;

[0108] Fig.28 A flowchart of a composite method provided for some embodiments of the present application.

[0109] Among them, the reference numerals in the figure are:

[0110] 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 20-box; 201-accommodation space; 21-first part; 22-second part; 11-electrode assembly; 111-first pole piece; 1111-first current collector; 11111-first pole ear; 1112-first active layer; 112-second pole piece; 1121-second current collector; 11211-second pole ear; 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

[0111] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0112] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0113] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0114] In the description of the present application, "plurality" means more than two, and unless otherwise clearly and specifically defined, "more than two" includes two. Accordingly, "multiple groups" means more than two groups, including two groups.

[0115] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0116] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0117] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0118] In the related art, a battery cell may generally include a housing and an electrode assembly disposed in the housing. The electrode assembly is a component in the battery cell where an electrochemical reaction occurs. The electrode assembly is mainly formed by stacking or winding a positive electrode sheet and a negative electrode sheet, and a diaphragm is disposed between the positive electrode sheet and the negative electrode sheet. The diaphragm is an insulating structure with insulating properties, and 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 caused by overlapping the positive electrode sheet and the negative electrode sheet.

[0119] In some cases, during the processing of the battery cell, it is necessary to apply a large pressure to the positive electrode sheet, the negative electrode sheet and the separator by means of, but not limited to, rolling, so as to perform a composite operation, so that the separator is integrally composited and fixed to the positive electrode sheet and the negative electrode sheet. In this way, the position of the separator on the positive electrode sheet and the negative electrode sheet can be maintained, thereby maintaining the insulation effect of the separator on the positive electrode sheet and the negative electrode sheet.

[0120] However, in the process of applying a large pressure to the positive electrode sheet, the negative electrode sheet and the diaphragm by a method that can be but not limited to rolling, so that the diaphragm is composited and fixed to the positive electrode sheet and the negative electrode sheet as a whole, the diaphragm as a whole will be subjected to a large pressure, which makes the air permeability of the diaphragm worse, and the ion conductivity of the diaphragm also weakens. In this way, it is difficult for ions in the electrolyte to pass through the diaphragm, and thus it is difficult to deintercalate between the positive electrode sheet and the negative electrode sheet. Therefore, under the composite operation, the air permeability of the diaphragm is affected, which in turn affects the charge and discharge performance of the battery cell, thereby affecting the dynamic performance of the battery cell.

[0121] Based on the above considerations, the embodiments of the present application provide a battery cell, a battery, an electrical device, a composite device and method, and a processing device, by compositely fixing part of the diaphragm to the first pole piece; or, compositely fixing part of the diaphragm to the second pole piece; or, compositely fixing part of the diaphragm to the first pole piece and the second pole piece. In this way, only a part of the diaphragm is used for the composite operation, and the other part of the diaphragm is not used for the composite operation, which can improve the problem of poor overall air permeability of the diaphragm, help improve the ion conductivity of the diaphragm, and then help improve the charge and discharge performance of the battery cell, so as to improve the dynamic performance of the battery cell.

[0122] It should be noted that the composite device and method refer to a composite device and a composite method.

[0123] 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 power sources.

[0124] 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, for example, 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, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. According to the drive mode, the vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle.

[0125] In other embodiments, the battery cells and batteries involved in the embodiments of the present application may also be used in energy storage devices, wherein the energy storage devices may be energy storage containers, energy storage cabinets, and the like.

[0126] The battery involved in the embodiment of the present application can be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component. Hybrid connection means that multiple battery cells are connected in both series and in parallel.

[0127] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, the multiple battery cells may be fixed by cable ties or the like to form a battery module. As an example, the multiple battery cells may also be fixed by end plates, side plates, or the like to form a battery module.

[0128] In other embodiments, the battery may be a battery pack, which may include a box and a battery cell. As an example, the battery cell may be directly accommodated in the box. As an example, the battery cell may also be formed into a battery module first and then accommodated in the box.

[0129] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell may be a secondary battery or a primary battery. The battery cell may be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell may be cylindrical, flat, rectangular, or in other shapes.

[0130] For ease of description, the embodiments of the present application are described using an electrical device as a vehicle as an example.

[0131] In some embodiments, see Figure 1 , Figure 1 Schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The above-mentioned battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0132] In some embodiments, the battery 100 can be used not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0133] In some embodiments, see Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 20 and a plurality of battery cells 10. The box body 20 is a structure having a receiving space 201 inside, and the box body 20 can adopt a variety of structures. In some embodiments, the box body 20 can include a first part 21 and a second part 22, and the first part 21 and the second part 22 cover each other and jointly define the receiving space 201.

[0134] Among them, see Figure 2 , the first part 21 can be a hollow structure with an opening at one end, the second part 22 is a plate-like structure, and the second part 22 covers the opening side of the first part 21, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space 201. Alternatively, the first part 21 and the second part 22 can both be hollow structures with an opening at one end, and the opening side of the first part 21 covers the opening side of the second part 22, so that the first part 21 and the second part 22 jointly define the above-mentioned accommodation space 201.

[0135] 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.

[0136] In some embodiments, see Figure 2, multiple battery cells 10 can be connected in series, in parallel or in hybrid connection to form a whole, and then the whole formed by the multiple battery cells 10 is directly accommodated in the above-mentioned accommodation space 201 of the box body 20. In other embodiments, multiple battery cells 10 can also be connected in series, in parallel or in hybrid connection first, and arranged and fixed to form multiple battery modules, and the multiple battery modules are then connected in series, in parallel or in hybrid connection to form a whole, and accommodated in the above-mentioned accommodation space 201 of the box body 20.

[0137] In some embodiments, the box 20 of the battery 100 can be used as part of the chassis structure of the vehicle 1000. For example, part of the box 20 can become at least a part of the chassis of the vehicle 1000, or part of the box 20 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0138] In some embodiments, please refer to Figures 3 to 5 , and combined with other drawings. Figure 3 A front view of an electrode assembly 11 of a battery cell 10 provided in some embodiments of the present application, Figure 4 A top view of an electrode assembly 11 of a battery cell 10 provided in some embodiments of the present application. Figure 4 Specifically, it is a schematic diagram of the electrode assembly 11 from the perspective of the first direction Z mentioned below, Figure 4 The first composite structure and the second composite structure are not shown. Figure 3 and Figure 4 In the embodiment, the electrode assembly 11 is mainly formed by stacking and winding the positive electrode sheet and the negative electrode sheet, which is the winding body mentioned below. Figure 5 Schematic diagram of an electrode assembly 11 of a battery cell 10 provided in some other embodiments of the present application, Figure 5 The positive electrode sheet and the negative electrode sheet of the electrode assembly 11 are indicated by dotted lines. Figure 5 In the embodiment, the electrode assembly 11 is mainly composed of a positive electrode sheet and a negative electrode sheet stacked together, which is a winding body referred to below.

[0139] The battery cell 10 may include an electrode assembly 11 and a case.

[0140] The electrode assembly 11 is a component in the battery cell 10 where an electrochemical reaction occurs. Among them, 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 a pole ear. The pole ear of the positive electrode sheet is the positive pole ear, and the pole ear of the negative electrode sheet is the negative pole ear. The positive pole ear and the negative pole 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 the positive electrode sheet and the negative electrode sheet.

[0141] In the battery cell 10 , the shape of the electrode assembly 11 may be cylindrical, square, flat, or the like.

[0142] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0143] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0144] In some embodiments, the battery cell 10 may further include an electrolyte, which plays a role in conducting ions between the positive electrode sheet and the negative electrode sheet. In the process of ions moving between the positive electrode sheet and the negative electrode sheet, the ions need to pass through the separator 113 between the positive electrode sheet and the negative electrode sheet. In particular, the electrolyte involved in the embodiments of the present application may be liquid, gel or solid.

[0145] In some embodiments, the housing may include a shell and an end cap, the shell and the end cap 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. Among them, the shell and the end cap may be independent components. Specifically, the shell has an opening, and the end cap is arranged 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 also 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. When the electrode assembly 11 needs to be packaged after the electrode assembly 11 is placed in the shell, the end cap is closed with the shell.

[0146] The number of the end caps may be one, or the number of the end caps may be two, and the two end caps are respectively arranged at opposite ends of the shell.

[0147] The shell may be cylindrical, square, or other shapes, which may be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell and the end cap may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0148] Please also read Figures 3 to 9 , and combined with other drawings. Figure 6 for Figure 5 The cross-sectional view along AA, Figure 6 Ellipses are used to omit some of the structures on both sides. Figure 7 for Figure 3 Cross-sectional view along BB, Figure 7 Ellipses are used to omit some of the structures on both sides. Figure 8 for Figure 3 A schematic diagram of the first separator 113a, the first pole piece 111, the second separator 113b and the second pole piece 112 of the electrode assembly 11 of the battery 100 monomer after being stacked and before being wound is provided, Fig. 9 for Figure 8 Schematic diagram of the middle edge CC. The battery 100 provided in the embodiment of the present application includes an electrode assembly 11, and the electrode assembly 11 includes a first electrode sheet 111, a second electrode sheet 112 and a separator 113. In some possible designs, please refer to Figure 5 and Figure 6 , the first pole piece 111 and the second pole piece 112 are alternately stacked; or, in other possible designs, please refer to Figure 3 , Figure 4 , Figures 7 to 9 The first pole piece 111 and the second pole piece 112 are alternately stacked and wound. At least a portion of the diaphragm 113 is disposed between the first pole piece 111 and the second pole piece 112. In addition, a portion of the diaphragm 113 is compositely fixed to the first pole piece 111 and / or the second pole piece 112.

[0149] The first pole piece 111 is a positive pole piece, and the second pole piece 112 is a negative pole piece. Alternatively, the first pole piece 111 is a negative pole piece, and the second pole piece 112 is a positive pole piece.

[0150] 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 .

[0151] 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, Figure 8 and Fig. 9In the embodiment, 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, Figure 5 and Figure 6 In the embodiment, the number of the first pole piece 111 and the number of the second pole piece 112 are both multiple.

[0152] For ease of description, the electrode assembly 11 formed by alternately stacking the first pole piece 111 and the second pole piece 112 is named a stack, and the electrode assembly 11 formed by stacking and winding the first pole piece 111 and the second pole piece 112 is named a winding.

[0153] When the electrode assembly 11 is a stacked body, the number of the diaphragm 113 can be set to one, and the diaphragm 113 is bent and arranged in the process of alternating stacking of the first pole piece 111 and the second pole piece 112, so that at least a part of the diaphragm 113 is stacked between the first pole piece 111 and the second pole piece 112. Alternatively, the number of the diaphragm 113 can also be set to multiple, and at least one diaphragm 113 is stacked between the first pole piece 111 and the second pole piece 112.

[0154] When the electrode assembly 11 is a wound body, the number of the separators 113 is generally the same as the number of the pole pieces (including the first pole piece 111 and the second pole piece 112), and the separators 113 and the pole pieces are stacked and wound in the order of separators 113, pole pieces, and separators 113. For example, the number of the first pole piece 111 and the number of the second pole piece 112 are both one. Figure 3 , Figure 4 , Figures 7 to 9 As shown, there are two diaphragms 113 , which are respectively a first diaphragm 113 a and a second diaphragm 113 b . The first diaphragm 113 a , the first pole piece 111 , the second diaphragm 113 b and the second pole piece 112 are alternately stacked and wound.

[0155] Based on this, a diaphragm 113 is provided between the first pole piece 111 and the second pole piece 112 to achieve insulation between the first pole piece 111 and the second pole piece 112 and improve the problem of self-discharge caused by the overlap of the first pole piece 111 and the second pole piece 112 .

[0156] In some possible designs, the diaphragm 113 is only disposed between the first pole piece 111 and the second pole piece 112 to achieve insulation between the first pole piece 111 and the second pole piece 112, and to improve the problem of self-discharge caused by the overlap of the first pole piece 111 and the second pole piece 112. Alternatively, in some other possible designs, a portion of the diaphragm 113 is disposed between the first pole piece 111 and the second pole piece 112, and another portion of the diaphragm 113 can be disposed at the outermost side of the overall structure formed by the first pole piece 111 and the second pole piece 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 pole piece 111 and the second pole piece 112, the diaphragm 113 is provided on both opposite sides of the electrode assembly 11. As another example, Figure 4 As shown, the electrode assembly 11 is a wound body, and the electrode assembly 11 is terminated with a separator 113 after winding.

[0157] Part of the diaphragm 113 is compositely fixed to the first pole piece 111 and / or the second pole piece 112, which means that only part of the diaphragm 113 is used for composite operation, and the other part of the diaphragm 113 is not used for composite operation. Figures 9 to 11 , Fig.10 for Fig. 9 The structure shown is a schematic diagram of another embodiment, Fig.11 for Fig. 9 The structure shown is a schematic diagram of another embodiment. It can be understood that in some possible designs, such as Fig.10 As shown, the diaphragm 113 is only partially fixed to the first pole piece 111, but not fixed to the second pole piece 112; or, in some other possible designs, such as Fig.10 As described above, the diaphragm 113 is only partially fixed to the second pole piece 112, but not fixed to the first pole piece 111; or, in some other possible designs, such as Fig. 9 As shown, a portion of the diaphragm 113 is compositely fixed to the first pole piece 111 and the second pole piece 112 .

[0158] Part of the diaphragm 113 is fixed to the first pole piece 111 and the second pole piece 112, which means that part of the diaphragm 113 is fixed to the first pole piece 111, and part of the diaphragm 113 is fixed to the second pole piece 112. In addition, the other part of the diaphragm 113 is not fixed to the first pole piece 111, nor is it fixed to the second pole piece 112. As an example, Fig. 9 As shown, a portion of the first diaphragm 113 a is compositely fixed to the first pole piece 111 , and a portion of the second diaphragm 113 b is compositely fixed to the first pole piece 111 and the second pole piece 112 .

[0159] The battery 100 monomer provided in the embodiment of the present application is obtained by fixing part of the diaphragm 113 to the first pole piece 111; or fixing part of the diaphragm 113 to the second pole piece 112; or fixing part of the diaphragm 113 to the first pole piece 111 and the second pole piece 112. In this way, only a part of the diaphragm 113 is used for the compounding operation, and the other part of the diaphragm 113 is not used for the compounding operation. In this way, the problem of poor overall air permeability of the diaphragm 113 can be improved, which helps to improve the ion conductivity of the diaphragm 113, and further helps to improve the charge and discharge performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer.

[0160] Please also read Figures 12 to 15 , and combined with other drawings. Fig.12 A partial schematic diagram of a processing device 2000 provided in some embodiments of the present application, Fig.13 for Fig.12 The obtained electrode assembly 11, Fig.14 The shaping device 2300 of the processing equipment 2000 provided in some embodiments of the present application is Fig.13 The schematic diagram of the obtained electrode assembly 11 undergoing shaping, Fig.15 for Fig.14 The obtained electrode assembly 11. Figures 13 to 15 In the figure, the electrode assembly 11 is only briefly illustrated, that is, the structure of the diaphragm 113 is simply illustrated.

[0161] It is necessary to add that please also refer to Figures 13 to 15 , and in combination with other drawings. The diaphragm 113 generally includes a substrate 1133 and an adhesive layer 1134, and the substrate 1133 has an adhesive layer 1134 on both opposite sides. The adhesive layer 1134 has an adhesive property, so that the diaphragm 113 can be bonded.

[0162] For the electrode assembly 11 which is a wound body, Fig.12 As shown, 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 .

[0163] In some related technologies, during the composite operation, the diaphragm 113 is subjected to a large pressure, causing the adhesive layer 1134 to be squeezed and deformed, and the structure changes and loses its adhesive ability. In the battery 100 monomer provided in the embodiment of the present application, only a part of the diaphragm 113 is subjected to the composite operation, and the other parts are not subjected to the composite operation, so that the adhesive ability of the adhesive layer 1134 of the other parts of the diaphragm 113 can be retained. In this way, after the first pole piece 111, the diaphragm 113 and the second pole piece 112 are stacked and wound, the diaphragm 113 can be bonded to the first pole piece 111 and the second pole piece 112 through the adhesive layer 1134, so that the integrity of the electrode assembly 11 formed by winding can be improved, and the problem of the electrode assembly 11 formed by winding being scattered can be improved, thereby improving the quality of the battery 100 monomer.

[0164] 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.

[0165] 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 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 outside 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 100 monomer provided in the embodiment of the present application, only a part of the diaphragm 113 is subjected to the composite operation, and the other part is not subjected to the composite operation, so that the adhesive layer 1134 of the part of the diaphragm 113 that is not subjected to the composite operation is not flattened and deformed, and the part of the diaphragm 113 that is not subjected to the composite operation has a larger thickness, which can provide a larger buffer space for the expansion of the first pole piece 111 and the second pole piece 112. In this way, after the first pole piece 111, the diaphragm 113 and the second pole piece 112 are stacked and wound, there is a large distance between the first pole piece 111 and the second pole piece 112 on the opposite sides of the part of the diaphragm 113 that is not subjected to the composite operation. During the charge and discharge process of the battery 100 monomer, the first pole piece 111 and the second pole piece 112 can expand and squeeze the diaphragm 113 that is not subjected to the composite operation, that is, a certain buffer is obtained through the diaphragm 113 that is not subjected to the composite operation, thereby improving the problem of expansion and fracture of the first pole piece 111 and the second pole piece 112 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 .

[0166] For some electrode assemblies 11 that are wound bodies, such as Figure 4 , Figures 12 to 15 As shown in the figure, and combined with other figures. Figure 4 and Fig.15The 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. 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 straightly extended, and the first pole piece 111, the second pole piece 112 and the diaphragm 113 of the curved part n are all bent and extended, 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 fixed to the first pole piece 111 and the second pole piece 112, the diaphragm 113 as a whole will be subjected to a large pressure, so that the adhesive layer 1134 is 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 easily break during the expansion process, thereby causing safety problems 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 part of the diaphragm 113 is composited, and the other parts are not composited, so that the adhesive layer 1134 of the part of the diaphragm 113 that is not composited is not flattened and deformed, and the part of the diaphragm 113 that is not composited has a larger thickness. In this way, during the shaping process, the straight portion m of the electrode assembly 11 will be subjected to a large shaping pressure, so that the adhesive layer 1134 of the diaphragm 113 located in the straight portion m can be filled to the curved portion n as much as possible, so that a larger gap can be formed between the first pole piece 111 and the second pole piece 112 of the curved portion n, so that the first pole piece 111 and the second pole piece 112 of the curved portion n can be provided with expansion space to improve the problem of expansion and fracture of the first pole piece 111 and the second pole piece 112 during the charging and discharging process. It can be understood that only a part of the diaphragm 113 is composited, so that the adhesive layer 1134 of the diaphragm 113 has the ability to provide a buffer gap for the charging and discharging of the electrode assembly 11.

[0167] The second direction X is parallel to Figure 3 and Figure 4 The X-axis shown in the figure, the first direction Z mentioned below is parallel to the Z-axis, Figure 3 and Figure 4 The Y axis is also shown in the figure. The X axis is perpendicular to the Z axis, the X axis is perpendicular to the Y axis, and the Y axis is perpendicular to the Z axis. That is, the first direction Z is perpendicular to the second direction X.

[0168] In some embodiments, please refer to FIG. Figures 5 to 11, and combined with other drawings. The first pole piece 111 includes a first current collector 1111 and a first active layer 1112, and the first active layer 1112 is arranged on the first current collector 1111. The second pole piece 112 includes a second current collector 1121 and a second active layer 1122, and the second active layer 1122 is arranged 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 arranged on the end side of the first film material 1131 along the first direction Z. The first film material 1131 is arranged opposite to the first active layer 1112, and the first film material 1131 is arranged opposite to the second active layer 1122. The second film material 1132 is only located outside the end side of the first active layer 1112 along the first direction Z; or, as Figures 5 to 9 As shown, the second film material 1132 is only located outside the end side of the second active layer 1122 along the first direction Z; or, 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. Fig.10 As shown, the second film material 1132 is only at least partially composited and fixed to the first pole piece 111; or Fig.11 As shown, the second film material 1132 is only at least partially fixed to the second pole piece 112; or Fig. 9 As shown, at least a portion of the second film material 1132 is compositely 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 .

[0169] The first active layer 1112 refers to a structural layer of the first electrode 111 composed of active materials, which is used to extract or embed ions during the charge and discharge process of the battery 100. The first active layer 1112 is disposed on opposite sides of the first current collector 1111.

[0170] The first current collector 1111 refers to a metal structure of the first pole piece 111 that is used to carry 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 .

[0171] The second active layer 1122 refers to a structural layer of the second electrode 112 composed of active materials, which is used to extract or embed ions during the charge and discharge process of the battery 100. The second active layer 1122 is disposed on both opposite sides of the second current collector 1121.

[0172] The second current collector 1121 refers to a metal structure of the second pole piece 112 that is used to carry 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 .

[0173] As an example, the first current collector 1111 is an aluminum foil, and the second current collector 1121 is a copper foil.

[0174] The first film material 1131 and the second film material 1132 are different parts of the diaphragm 113. The second film material 1132 is disposed at one end of the first film material 1131 along the first direction Z; or, the second film material 1132 is disposed at both opposite ends of the first film material 1131 along the first direction Z.

[0175] Wherein, 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 only located 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 respectively located outside the opposite ends of the first active layer 1112 along the first direction Z. When the second film material 1132 is only located outside the end side of the second active layer 1122 along the first direction Z, such as Figures 5 to 11 As shown, the second film material 1132 at the opposite ends can be respectively located outside the opposite ends of the second active layer 1122 along the first direction Z. 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 at the opposite ends is respectively located outside the opposite ends of the first active layer 1112 along the first direction Z, and is respectively located outside the opposite ends of the second active layer 1122 along the first direction Z.

[0176] The first direction Z is parallel to the first pole piece 111 and the second pole piece 112, which means that the first direction Z is parallel to the surface of the first pole piece 111, and the first direction Z is parallel to the surface of the second pole 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.

[0177] It should be noted that when the electrode assembly 11 is a laminate, such as Figure 5 and Figure 6 As shown, the first direction Z is any direction parallel to the first pole piece 111 and the second pole piece 112. It can be understood that the first direction Z is any direction perpendicular to the stacking direction of the first pole piece 111 and the second pole piece 112, that is, any direction on the plane perpendicular to the stacking direction of the first pole piece 111 and the second pole piece 112. The first direction Z can be one of the above arbitrary directions, or multiple directions of the above arbitrary directions. As an example, Figure 5As shown, 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, and can also be the direction where the X axis is located.

[0178] When the electrode assembly 11 is a wound body, such as Figure 3 , Figure 4 , Figures 7 to 11 As shown, 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 .

[0179] When the second film material 1132 is only located outside the end side of the first active layer 1112 along the first direction Z, the second active layer 1122 is arranged to extend outside the first active layer 1112 along the first direction Z, so that at least part of the second film material 1132 and the part of the second active layer 1122 extending outside the first active layer 1112 are arranged opposite to each other, and are not located outside the end side of the second active layer 1122 along the first direction Z. In this way, 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 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 composite operation, 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 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 composite operation, and has good air permeability and ion conductivity, thereby improving the charging and discharging performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer.

[0180] When the second film material 1132 is only located outside the end side of the second active layer 1122 along the first direction Z, such as Figures 6 to 11As shown, 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 to a 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 to 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 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 composite operation, 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 part of the diaphragm 113 is not used for composite operation, and has good air permeability and ion conductivity, so as to improve the charging and discharging performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer.

[0181] 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, the first active layer 1112 and the second active layer 1122 are not used for composite operation, and the first film material 1131 opposite to the first active layer 1112 and the second active layer 1122 is not used for composite operation, 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 first active layer 1112 along the first direction Z and the size of the second active layer 1122 along the first direction Z, and then 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 composite operation, and has good air permeability and ion conductivity, so as to improve the charge and discharge performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer. Among them, 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.

[0182] In the case where at least part of the second film material 1132 is compositely fixed to the first pole piece 111 and the second pole piece 112, part of the second film material 1132 is compositely fixed to the first pole piece 111, and part of the second film material 1132 is compositely fixed to the second pole piece 112. The part of the second film material 1132 compositely fixed to the first pole piece 111 and the part of the second film material 1132 compositely fixed to the second pole piece 112 may be overlapped or may not be overlapped.

[0183] 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 pole piece 111 and / or the second pole piece 112; the first film material 1131 is relative to 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 diaphragm 113, that is, a larger part of the diaphragm 113 is not used for composite operation, and has good air permeability and ion conductivity, so that the charge and discharge performance of the battery 100 monomer can be improved, so as to improve the dynamic performance of the battery 100 monomer. Furthermore, 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 composite operations, while the middle part of the diaphragm 113 along the first direction Z is not used for composite operations. This facilitates the embedding and de-embedding 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, so as to improve the dynamic performance of the battery 100 monomer.

[0184] 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 of self-discharge of the electrode assembly 11 caused by the overlap of the first pole piece 111 and the second pole piece 112 caused by the folding of the diaphragm 113 and the inability of the diaphragm 113 to wrap the pole piece.

[0185] In some embodiments, please refer to Figures 6 to 11 , and in combination with other drawings. The first active layer 1112 is 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.

[0186] The first active layer 1112 extends beyond the second active layer 1122 along the first direction Z, so that the size of the first active layer 1112 along the first direction Z is larger than the size of the second active layer 1122 along the first direction Z; and in the first direction Z, the first active layer 1112 can completely cover the second active layer 1122. Figures 6 to 11 As shown, the first active layer 1112 may extend beyond two opposite ends of the second active layer 1122 along the first direction Z; or, the first active layer 1112 may extend beyond one end of the second active layer 1122 along the first direction Z.

[0187] In some possible designs, the first pole piece 111 is a negative pole piece, and the second pole piece 112 is a positive pole piece.

[0188] In this configuration, the active layer of the first electrode 111 exceeds the active layer of the second electrode 112, so that the size of the active layer of the first electrode 111 along the first direction Z is larger than the size of the active layer of the second electrode 112 along the first direction Z. In this way, the problem that ions cannot be completely embedded in the first active layer 1112 after escaping from the second active layer 1122 can be improved, and further the problem that ions accumulate outside the first active layer 1112 and the second active layer 1122 and puncture the diaphragm 113, ion precipitation, etc. can be improved. Furthermore, 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 occupies 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 embedding and de-embedding 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, so as to improve the dynamic performance of the battery 100 monomer.

[0189] It should be additionally explained 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 .

[0190] In some embodiments, please refer to Figures 6 to 11 , Fig.16 , and combined with other drawings. Among them, Fig.16 for Fig. 9 The second film material 1132 also extends beyond the first active layer 1112 along the first direction Z.

[0191] With such configuration, the second film material 1132 can better achieve insulation between the portion of the first active layer 1112 that extends beyond the second active layer 1122 and the second pole piece 112 , thereby improving the overlap problem between the first active layer 1112 and the second pole piece 112 .

[0192] In some embodiments, please refer to Fig. 9 and Fig.10, and in combination with other drawings. At least a portion of the second film material 1132 is compositely fixed to a portion of the first active layer 1112 that is beyond the second active layer 1122 along the first direction Z.

[0193] Understandably, in some possible designs, such as Fig. 9 and Fig.10 As shown, all the second film materials 1132 are 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, such as Fig.10 As shown; it can also be compositely fixed not only to the first active layer 1112 along the first direction Z beyond the second active layer 1122, and at least part of the second film material 1132 can also be compositely fixed to the insulating layer 1123 of the second pole piece 112, as shown Fig. 9 Alternatively, in some other possible designs, such as Fig.16 As shown, a portion 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; another portion of the second film material 1132 may not be used for composite operation, or may be compositely fixed to the insulating layer 1123 of the second pole piece 112 mentioned below, or may be partially compositely fixed to the insulating layer 1123 and partially not used for composite operation.

[0194] 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 to and compositely fixed to the portion of the first active layer 1112 that exceeds 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 pole piece 111 is achieved, and the insulation between the first pole piece 111 and the second pole piece 112 by the diaphragm 113 can be maintained, and the problem of overlap between the first pole piece 111 and the second pole piece 112 caused by the diaphragm 113 being unable to wrap the pole piece due to the folding of the diaphragm 113 is improved.

[0195] In some embodiments, please refer to FIG. Fig. 9 and Fig.10 , Fig.16 , and in combination with other drawings. At least one side or two opposite sides of the first active layer 1112 that is beyond the second active layer 1122 along the first direction Z are compositely fixed to the second film material 1132 .

[0196] Understandably, in some possible designs, such as Fig.16As shown, one side of the first active layer 1112 that exceeds all parts of the second active layer 1122 along the first direction Z is compositely fixed to the second film material 1132. Alternatively, in some other possible designs, such as Fig. 9 and Fig.10 As shown, the opposite sides of all the parts of the first active layer 1112 that extend 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 part of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z is compositely fixed to the second film material 1132, and the opposite sides of another part of the first active layer 1112 that extends 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 part of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z is compositely fixed to the second film material 1132, and another part of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z is not used for composite operation. Alternatively, two opposite sides of a portion of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z are both composited and fixed to the second film material 1132 , and another portion of the first active layer 1112 extending beyond the second active layer 1122 along the first direction Z is not used for the composite operation.

[0197] As an example, Fig. 9 and Fig.10 As shown, the first active layer 1112 has a diaphragm 113 on both sides, and the second active layer 1122 has a second film material 1132 on both sides. This arrangement allows the diaphragm 113 to be better fixed to the first pole piece 111.

[0198] 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.

[0199] In some embodiments, please refer to Figures 9 and 10 , Fig.16 In some possible designs, the first active layer 1112 is fixed to the second film material 1132 at a portion extending beyond one end of the second active layer 1122 along the first direction Z. Alternatively, in some other possible designs, such as Figures 9 and 10 , Fig.16 Portions of the first active layer 1112 that extend beyond the two opposite ends of the second active layer 1122 along the first direction Z are both compositely fixed to the second film material 1132 .

[0200] By arranging the portion of the first active layer 1112 that exceeds one end of the second active layer 1122 along the first direction Z to be compositely fixed to the second film material 1132, the proportion of the portion of the first active layer 1112 used for composite operation can be reduced, so that the proportion of the portion of the diaphragm 113 that is not used for composite operation can be correspondingly increased, that is, most of the diaphragm 113 is not used for composite operation, and has good air permeability and ion conductivity. In this way, the first active layer 1112 can effectively deintercalate ions, thereby improving the charge and discharge performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer.

[0201] By arranging 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 all compositely fixed to the second film material 1132, the composite fixing effect of the diaphragm 113 on the electrode assembly 11 can be improved. It should be supplemented 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 materials 1132 on opposite sides.

[0202] In some embodiments, please refer to Figures 6 to 11 , Fig.16 , and in combination with other drawings. The second pole piece 112 further includes an insulating layer 1123, which is disposed on the second current collector 1121, and the insulating layer 1123 is disposed 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 to the second film material 1132.

[0203] The insulating layer 1123 refers to a structural layer made of an insulating material. The insulating layer 1123 is disposed on opposite sides of the first current collector 1111 .

[0204] 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.

[0205] 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.

[0206] 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.

[0207] In some embodiments, please refer to Fig. 9 , Fig.11 and Fig.16 At least a portion of the second film material 1132 is compositely fixed to the insulating layer 1123 .

[0208] It can be 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 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, 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, and a portion of the second film material 1132 may not be used for composite operation. Or, in other possible designs, such as Fig. 9 , Fig.11 and Fig.16 As shown, all the second film materials 1132 are compositely fixed to the insulating layer 1123 .

[0209] It should be noted that the second film material 1132 is disposed opposite to the insulating layer 1123, and the second film material 1132 is disposed opposite to the portion of the first active layer 1112 that extends beyond the second active layer 1122 along the first direction Z. Based on this, as an example, Fig. 9 As shown, 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 and the insulating layer 1123 at the same time. 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.

[0210] 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 that extends beyond the second active layer 1122 along the first direction Z. In this way, the diaphragm 113 can effectively achieve insulation between the first pole piece 111 and the second pole piece 112, thereby improving the overlap problem between the first active layer 1112 and the second current collector 1121, that is, improving the self-discharge problem of the electrode assembly 11 caused by the overlap between the first pole piece 111 and the second pole piece 112.

[0211] In some embodiments, please refer to Figures 6 to 9 , Fig.11 and Fig.16 , and in combination with other drawings. 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 .

[0212] Understandably, in some possible designs, such as Figures 7 to 9 , Fig.11 and Fig.16 As shown, one side of all insulating layers 1123 is compositely fixed to the second film material 1132. Alternatively, in some other possible designs, such as Figure 6 As shown, the opposite sides of all insulating layers 1123 have the second film material 1132, and the opposite sides of all insulating layers 1123 are compositely fixed to the corresponding second film material 1132. Alternatively, in some possible designs, one side of a portion of the insulating layers 1123 is compositely fixed to the second film material 1132, and the opposite sides of another portion of the insulating layers 1123 are compositely fixed to the second film material 1132. Alternatively, in some possible designs, one side of a portion of the insulating layers 1123 is compositely fixed to the second film material 1132, and the other portion of the insulating layers 1123 is not used for composite operation. Alternatively, the opposite sides of a portion of the insulating layers 1123 are compositely fixed to the second film material 1132, and the other portion of the insulating layers 1123 is not used for composite operation.

[0213] 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 , so that the composite operation of the second pole piece 112 and the diaphragm 113 is very flexible.

[0214] In some embodiments, please refer to Fig. 9 , Fig.11 and Fig.16 , and in combination with other drawings. 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 .

[0215] The second pole tab 11211 is a pole tab disposed on the second pole piece 112 , and the second pole tab 11211 is formed by extending from the second current collector 1121 .

[0216] 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 .

[0217] By locating the insulating layer 1123 between the second active layer 1122 and the second pole ear 11211 and extending beyond one end of the first active layer 1112 away from the second active layer 1122 along the first direction Z, the insulating layer 1123 can achieve insulation between the first active layer 1112 and the second current collector 1121, thereby improving the problem that the end of the first active layer 1112 along the first direction Z pierces the second film material 1132 and overlaps the second current collector 1121.

[0218] In some embodiments, please refer to Fig. 9 , Fig.11 , Fig.16 and Fig.17 , and combined with other drawings. Among them, Fig.17 for Fig. 9 The structure shown is a schematic diagram of some further embodiments. 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. In some possible designs, such as Fig. 9 , Fig.11 and Fig.16 As shown, 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 11111; or, in some other possible designs, such as Fig.17 As shown, the second electrode tab 11211 is located at one end of the second active layer 1122 along the first direction Z away from the first electrode tab 11111 .

[0219] The first pole tab 11111 is a pole tab disposed on the first pole sheet 111 , and the first pole tab 11111 is formed by extending from the first current collector 1111 .

[0220] like Fig. 9 , Fig.11 and Fig.16 As shown, 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 can be 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.

[0221] like Figure 7 As shown, 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 can be understood 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.

[0222] 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 .

[0223] In this way, the first pole tab 11111 and the second pole tab 11211 can be arranged at the same end or opposite ends of the electrode assembly 11 along the first direction Z. In this way, the insulating layer 1123 can be located at one end of the second current collector 1121 close to or away from the first pole tab 11111 along the first direction Z to achieve insulation between the second current collector 1121 and the first active layer 1112, thereby improving the problem that the end of the first active layer 1112 pierces the diaphragm 113 and overlaps the second current collector 1121.

[0224] In some embodiments, please refer to Figures 9 to 11 , Fig.16 and Fig.17 , and combined with other drawings. Figures 9 to 11 , Fig.16 and Fig.17 As shown, 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 Fig. 9 and Fig.17 As shown, at least two opposite sides of a portion of the second film material 1132 are respectively compositely fixed to the first pole piece 111 and the second pole piece 112 .

[0225] Understandably, in some possible designs, such as Fig.10 , Fig.11 and Fig.16 As shown, one side of all the second film materials 1132 is fixed to the first pole piece 111 or the second pole piece 112. Alternatively, in some other possible designs, the opposite sides of all the second film materials 1132 are fixed to the first pole piece 111 and the second pole piece 112 respectively. Alternatively, in some other possible designs, as Fig. 9 and Fig.17 As shown, 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 the opposite two sides of another portion of the second film material 1132 are compositely fixed to the first pole piece 111 and the second pole piece 112. Alternatively, in some other possible designs, 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 the other portion of the second film material 1132 is not used for composite operation. Alternatively, the opposite two 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, and the other portion of the second film material 1132 is not used for composite operation.

[0226] The two opposite sides of the second film material 1132 are respectively fixed to the first pole piece 111 and the second pole piece 112, specifically, one side of the second film material 1132 is fixed to the first pole piece 111, and the other side of the second film material 1132 is fixed to the second pole piece 112. Based on this, the composite fixing effect of the second film material 1132 can be improved to better maintain the insulation effect of the second diaphragm 113b on the first pole piece 111 and the second pole piece 112.

[0227] Such an arrangement makes the composite operation of the second film material 1132 on the electrode assembly 11 very flexible.

[0228] In some embodiments, please refer to Fig. 9 and Fig.10 The second film material 1132 is disposed 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 .

[0229] 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, which means that the second film material 1132 at each end along the first direction Z can be compositely fixed to the first pole piece 111, or to the second pole piece 112, or to both the first pole piece 111 and the second pole piece 112.

[0230] Such arrangement enables the second film materials 1132 at opposite ends of the first film material 1131 along the first direction Z to be composited, so that the second film materials 1132 at opposite ends of the diaphragm 113 along the first direction Z are fixed relative to the first pole piece 111 and the second pole piece 112. In this way, the problem that the diaphragm 113 cannot wrap the pole piece due to the folding of the diaphragm 113, which causes the first pole piece 111 and the second pole piece 112 to overlap and cause the electrode assembly 11 to self-discharge can be improved, and the insulation effect of the diaphragm 113 on the first pole piece 111 and the second pole piece 112 can be better maintained.

[0231] Based on the above structure, in some embodiments, Figures 9 to 11 , Fig.16 and Fig.17As shown, 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 part of the second film material 1132 is compositely fixed to the first pole piece 111 and / or the second pole piece 112, which means that at least part of the second film material 1132 can be compositely fixed to the portion of the first active layer 1112 extending 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; can also be compositely fixed to the portion of the first active layer 1112 extending 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.

[0232] In other embodiments, the second active layer 1122 may also extend beyond the first active layer 1112 along the first direction Z, and the second film material 1132 is 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 above-mentioned insulating layer 1123, and the insulating layer 1123 is located at the end side of the first active layer 1112 along the first direction Z. Based on this, at least part of the second film material 1132 is compositely fixed to the first pole piece 111 and / or the second pole piece 112, which means that at least part of the second film material 1132 may be compositely fixed to the portion of the second active layer 1122 extending 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; may also be compositely fixed to the portion of the second active layer 1122 extending 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.

[0233] 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 above-mentioned 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 part of the second film material 1132 is compositely fixed to the first pole piece 111 and / or the second pole piece 112, which means that at least part of the second film material 1132 can be compositely fixed to the insulating layer 1123 on the first current collector 1111; it can also be compositely fixed to the insulating layer 1123 on the second current collector 1121; it 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.

[0234] It can be understood that the second film material 1132 and the first pole piece 111 are compositely fixed, which means that the second film material 1132 and the first active layer 1112 of the first pole piece 111 are compositely fixed, or that the second film material 1132 and the insulating layer 1123 of the first pole piece 111 are compositely fixed. Correspondingly, the second film material 1132 and the second pole piece 112 are compositely fixed, which means that the second film material 1132 and the insulating layer 1123 of the second pole piece 112 are compositely fixed, or that the second film material 1132 and the second active layer 1122 of the second pole piece 112 are compositely fixed.

[0235] It should be noted that the above-mentioned one side refers to one surface, and the opposite two sides refer to opposite two surfaces. As a reference, one side of the insulating layer 1123 refers to one surface of the insulating layer 1123; the opposite two sides of the insulating layer 1123 refer to opposite two surfaces of the insulating layer 1123.

[0236] like Figures 9 to 11 , Fig.16 and Fig.17 As shown, the electrode assembly 11 includes a first electrode sheet 111, a second electrode sheet 112, a first diaphragm 113a and a second diaphragm 113b, and the first diaphragm 113a, the first electrode sheet 111, the second diaphragm 113b and the second electrode sheet 112 are sequentially stacked or stacked and wound. Both ends of the first diaphragm 113a opposite to each other along the first direction Z and both ends of the second diaphragm 113b opposite to each other along the first direction Z have a second film material 1132. 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 pole piece 111 and / or the second pole piece 112.

[0237] In some embodiments, please refer to Figures 18 to 20 , and combined with other drawings. Among them, Fig.18 for Figure 3 The schematic diagram of the first pole piece 111 and the separator 113 of the electrode assembly 11 after being stacked and before being wound is shown. Fig.19 for Fig.18 The structure shown is a schematic diagram of another embodiment, Fig. 20 for Fig.18 The structure shown is a schematic diagram of another embodiment. Figures 18 to 20In the figure, the first pole 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 combined with the first pole piece 111 to form the first composite structure a. In some possible designs, such as Fig.18 As shown, the first composite structure a of each end of the first pole piece 111 in the first direction Z is arranged at intervals; or, in some other possible designs, such as Fig.19 As shown, the first composite structure a of each end of the first pole piece 111 in the first direction Z is continuously arranged; or, in some other possible designs, such as Fig. 20 As shown, the first pole piece 111 is formed with two groups of the above-mentioned first composite structures a, which are spaced apart along the first direction Z, wherein one group of the first composite structures a is spaced apart, and the other group of the first composite structures a is continuously disposed.

[0238] The first composite structure a refers to a structure formed by the second film material 1132 and the first pole piece 111 .

[0239] It should be noted that the first active layer 1112 and / or the second active layer 1122 is provided with a second film material 1132 at one end along the first direction Z; or, the first active layer 1112 and / or the second active layer 1122 is provided with a second film material 1132 at both opposite ends along the first direction Z. Based on this, the first pole piece 111 can be compositely fixed with the second film material 1132 at one end along the first direction Z, or compositely fixed with the second film material 1132 at both opposite ends along the first direction Z. In this way, one end of the first pole piece 111 along the first direction Z has a first composite structure a, or both opposite ends of the first pole piece 111 along the first direction Z have the first composite structure a.

[0240] 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.

[0241] By adopting the above technical solution, the composite operation of the first pole piece 111 and the second film material 1132 is very flexible.

[0242] It should be noted that, by setting the first composite structure a at each end of the first pole piece 111 in the first direction Z at intervals, only a part of the second film material 1132 is used for composite operation, and the other part is not used for composite operation. In this way, part of the second film material 1132 can also have good air permeability and ion conductivity, so that a larger part of the diaphragm 113 is not used for composite operation, and has good air permeability and ion conductivity, which facilitates ion deintercalation between the first pole piece 111 and the second pole piece 112, and then facilitates improving the charge and discharge performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer. By setting the first composite structure a of the first pole piece 111 at each end of the first direction Z continuously, the composite fixing operation of the first pole piece 111 and the second film material 1132 is very simple.

[0243] In some embodiments, please refer to Fig.21 and Fig. 22 , and combined with other drawings. Fig.21 for Figure 3 The schematic diagram of the second pole piece 112 and the separator 113 of the electrode assembly 11 after stacking and before winding is shown. Fig. 22 for Fig.21 The structure shown is a schematic diagram of another embodiment. Fig.21 and Fig. 22 In the figure, 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 combined with the second electrode piece 112 to form the second composite structure b. In some possible designs, such as Fig. 20 As shown, the second composite structures b on the second pole piece 112 are arranged at intervals; or, in some other possible designs, such as Fig.21 As shown, the second composite structure b on the second pole piece 112 is continuously arranged.

[0244] The second composite structure b refers to a structure formed by the second film material 1132 and the second pole piece 112 .

[0245] By adopting the above technical solution, the composite operation of the second pole piece 112 and the second film material 1132 is very flexible.

[0246] In some embodiments, please combine the attached Figures 13 to 15and other drawings. 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.

[0247] The substrate 1133 refers to a structural layer of the diaphragm 113 for carrying the adhesive layer 1134, and the adhesive layer 1134 refers to a structural layer for bonding disposed on the substrate 1133. Both the substrate 1133 and the adhesive layer 1134 can be used to pass ions.

[0248] 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.

[0249] Among them, the diaphragm 113 is bonded to the first pole piece 111 and the second pole piece 112 through the adhesive layer 1134, specifically, the adhesive layer 1134 on one side of the diaphragm 113 is bonded to the first pole piece 111, and the adhesive layer 1134 on the other side of the diaphragm 113 is bonded to the second pole piece 112, thereby achieving the effect of the diaphragm 113 being compositely fixed to the first pole piece 111 and the second pole piece 112.

[0250] In some embodiments, see Figures 6 to 11 , Fig.16 and Fig.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 disposed 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.

[0251] The first adhesive layer 12 refers to a structural layer having adhesive bonding capability.

[0252] 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.

[0253] In some embodiments, the electrode assembly 11 may further include a second adhesive layer, and the second adhesive layer is disposed on the first electrode piece 111. The first electrode piece 111 is bonded to the diaphragm 113 through the second adhesive layer, so as to be compositely fixed to the diaphragm 113.

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

[0255] 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 .

[0256] As an example, the second adhesive layer is disposed on the first active layer 1112 of the first pole piece 111 .

[0257] In some embodiments, the electrode assembly 11 may further include a third adhesive layer, and the third adhesive layer is disposed on the second electrode piece 112. The second electrode piece 112 is bonded to the diaphragm 113 through the second adhesive layer, so as to be compositely fixed to the diaphragm 113.

[0258] The third adhesive layer refers to a structural layer having adhesive bonding capability.

[0259] 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 .

[0260] As an example, the third glue layer is disposed on the insulating layer 1123 of the second pole piece 112 .

[0261] 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 pole piece 111.

[0262] By adopting the above technical solution, during the composite operation, the diaphragm 113 can achieve a composite fixing effect by bonding.

[0263] In some embodiments, please refer to Figure 4 , Figures 12 to 15 , and in combination with other drawings. The first pole piece 111 and the second pole piece 112 are stacked and wound. And, in some possible designs, such as Figure 4 , Figures 12 to 15 As shown, the electrode assembly 11 is flat; or, in some other possible designs, such as Fig.13 As shown, the electrode assembly 11 is cylindrical.

[0264] 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 whole wound structure can be extruded and shaped to obtain a flat electrode assembly 11 .

[0265] By configuring 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 first electrode sheet 111 and / or the second electrode sheet 112 through partial compounding of the diaphragm 113, 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 breakage of the first electrode sheet 111 and / or the second electrode sheet 112 during the charging and discharging process of the battery 100 single cell.

[0266] See also Figure 2 , and in combination with other drawings. The battery 100 provided in the embodiment of the present application includes a battery 100 monomer. Among them, the battery 100 monomer in this embodiment is the same as the battery 100 monomer in the previous embodiment. For details, please refer to the relevant description of the battery 100 monomer in the previous embodiment, which will not be repeated here.

[0267] 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.

[0268] See also Figure 1 The electric device provided in the embodiment of the present application includes a battery 100 monomer or a battery 100. The battery 100 monomer and the battery 100 in the present embodiment are the same as the battery 100 monomer and the battery 100 in the previous embodiment. For details, please refer to the relevant description of the battery 100 monomer and the battery 100 in the previous embodiment, which will not be repeated here.

[0269] The electrical device provided in the embodiment of the present application, by adopting the battery 100 monomer or the battery 100 involved above, helps to improve the charging and discharging performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer, thereby improving the reliability of the electrical device.

[0270] Please also read Fig.12 and Fig.23 , and combined with other drawings. Fig.23Schematic 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.

[0271] 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 part of the diaphragm 113 is 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.

[0272] In some embodiments, please refer to Fig.12 and Fig.23 , and in combination with other figures. The composite device 2100 includes a composite mechanism 2110, and the composite mechanism 2110 is used to perform composite operations. In some possible designs, such as Fig.12 As shown, the number of the composite mechanism 2110 is one; or, in some other possible designs, such as Fig.23 As shown, there are multiple compound mechanisms 2110, and the multiple compound mechanisms 2110 are used to perform compound operations in sequence.

[0273] 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 .

[0274] In the embodiment where the number of the composite structure 2110 is one, when the diaphragm 113 only needs to be composited and fixed with the first pole piece 111, then only the first pole piece 111 and the diaphragm 113 need to pass through the composite structure 2110, and the second pole piece 112 does not need to pass through the composite structure 2110 for composite operation. Correspondingly, when the diaphragm 113 only needs to be composited and fixed with the second pole piece 112, then only the second pole piece 112 and the diaphragm 113 need to pass through the composite structure 2110, and the first pole 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 pole piece 111 and the second pole piece 112, as Fig.12 As shown, the stacked structure of the first pole piece 111, the diaphragm 113 and the second pole piece 112 needs to pass through a composite mechanism 2110 to perform a composite fixing operation.

[0275] In the embodiment where the number of the composite structures 2110 is multiple, take the number of the diaphragms 113 as two, the two diaphragms 113 are respectively the first diaphragm 113a and the second diaphragm 113b, and the first diaphragm 113a, the first pole piece 111, the second diaphragm 113b and the second pole piece 112 are stacked and wound to form the electrode assembly 11 as an example: when the diaphragm 113 only needs to be composited and fixed with the first pole piece 111, the first diaphragm 113a and the first pole piece 111 can be composited and fixed through the first composite structure 2110 first, 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 at at least one end of the first diaphragm 113a along the first direction Z to the first pole piece 111, and the second composite structure 2110 can also composite and fix the second film material 1132 at at least one end of the second diaphragm 113b along the first direction Z to the first pole piece 111. As an example, the first composite structure 2110 compositely fixes one end of the first pole 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 pole piece 111 along the first direction Z to the second diaphragm 113b.

[0276] 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 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. Fig.23As shown; the first diaphragm 113a, the first pole piece 111 and the second diaphragm 113b can also be firstly composited and fixed through the first composite mechanism 2110, and then composited and fixed with the second pole piece 112 through the second composite mechanism 2110; the first diaphragm 113a and the first pole piece 111 can even be firstly composited and fixed through the first composite mechanism 2110, and then composited and fixed with the second diaphragm 113b through the second composite mechanism 2110, and finally composited and fixed with the second pole piece 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, composite fixing operations can be performed sequentially through multiple composite mechanisms 2110. Based on this, each composite mechanism 2110 can perform composite fixing operations on one or both ends of the diaphragm 113 along the first direction Z.

[0277] By adopting the above technical solution, the number of composite mechanisms 2110 can be selected according to the required composite fixing effect, thereby making the composite operation very flexible.

[0278] In some embodiments, see Fig.24 , and combined with other drawings. Fig.24 Schematic diagram of a composite mechanism 2110 of a composite device 2100 provided in some embodiments of the present application. The composite mechanism 2110 includes a first composite roller 2111 and a second composite roller 2112, and the first composite roller 2111 includes a first rotating roller 21111 and a first convex portion 21112 disposed 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 roll-combining operation. The first convex portion 21112 and the second composite roller 2112 are spaced to form a rolling gap, and the first convex portion 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.

[0279] The first composite roller 2111 and the second composite roller 2112 refer to roller-shaped structures for cooperating in a rolling operation, wherein 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.

[0280] 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.

[0281] 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 is spaced from the outer circumference of the second composite roller 2112 to form a rolling gap. In addition, along the distribution direction of the first composite roller 2111 and the second composite roller 2112, the side of the first convex portion 21112 away from the first rotating roller 21111 is spaced from the first rotating roller 21111 to form a first avoidance space 2002.

[0282] The distribution direction of the first composite roller 2111 and the second composite roller 2112 is parallel to the radial direction of the first composite roller 2111 and also parallel to the radial direction of the second composite roller 2112. Moreover, the distribution direction of the first composite roller 2111 and the second composite roller 2112 is perpendicular to the axial direction of the first composite roller 2111 and the axial direction of the second composite roller 2112. Moreover, the axial direction of the first composite roller 2111 and the second composite roller 2112 is parallel to the first direction Z. That is, the distribution direction of the first composite roller 2111 and the second composite roller 2112 is perpendicular to the first direction Z.

[0283] 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 together 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.

[0284] By setting the first convex part 21112 on the outer peripheral side of the first rotating roller 21111 of the first composite roller 2111, the first convex part 21112 and the second composite roller 2112 cooperate to perform the rolling operation, and the first convex part 21112 and the first rotating roller 21111 define a first avoidance space 2002 connected to the rolling gap, so that the first convex part 21112 can cooperate with the second composite roller 2112 to roll a part of the whole formed by at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113, and the other part avoids the first avoidance space 2002 without performing the composite fixing operation. In this way, the problem of poor overall air permeability of the diaphragm 113 can be improved, which helps to improve the ion conductivity of the diaphragm 113, and further helps to improve the charge and discharge performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer.

[0285] It should be supplemented here that when a composite operation needs to be performed on one end of the whole 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 first convex portion 21112 at one end along the first direction Z. When a composite operation needs to be performed on both ends of the whole 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 first convex portion 21112 at both ends along the first direction Z.

[0286] In some embodiments, see Fig.23 , and in combination with other drawings. The second composite roller 2112 includes a second rotating roller 21121 and a second convex portion 21122 disposed on the outer periphery of the second rotating roller 21121. The second convex portion 21122 is disposed opposite to the first convex portion 21112, and the above-mentioned rolling gap is formed by the interval. The second convex portion 21122 and the second rotating roller 21121 define a second avoidance space 2003, and the second avoidance space 2003 is connected to the rolling gap.

[0287] 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.

[0288] 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 is opposite to the second convex portion 21122 of the second composite roller 2112, and a rolling gap is formed between them. In addition, along the distribution direction of the first composite roller 2111 and the second composite roller 2112, the side of the second convex portion 21122 away from the second rotating roller 21121 is separated from the second rotating roller 21121 to form a second avoidance space 2003.

[0289] 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 charging and discharging performance of the battery 100 monomer, so as to improve the dynamic performance of the battery 100 monomer.

[0290] It should be supplemented here that when a composite operation needs to be performed on one end of the whole 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 rotating roller 21121 is provided with the second convex portion 21122 at one end along the first direction Z. When a composite operation needs to be performed on both ends of the whole 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 rotating roller 21121 is provided with the second convex portion 21122 at both ends along the first direction Z.

[0291] In some embodiments, please refer to Fig.25 and Fig.26 , and combined with other drawings. Fig.25 A cross-sectional view of a first composite roller 2111 and a second composite roller 2112 of a composite mechanism 2110 of a composite device 2100 provided in some embodiments of the present application, FIG. Fig.26 The 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 other embodiments of the present application. Fig.25 and Fig.26 Both Fig.24 A schematic diagram of the axial perspective of the first composite roller 2111 is also shown in FIG. Fig.24 Schematic diagram along the first direction Z. In some possible designs, such as Fig.25 As shown, the first convex portion 21112 is continuously arranged on the outer peripheral side of the first rotating roller 21111 along the circumferential direction. Alternatively, in some other possible designs, such as Fig.26 As shown, the first convex portions 21112 are arranged at intervals along the circumferential direction on the outer peripheral side 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 convex portions 21112, and the two groups of first convex portions 21112 are distributed at intervals along the first direction Z on the first rotating roller 21111. One group of the first convex portions 21112 is continuously arranged on the outer peripheral side of the first rotating roller 21111, and the other group of the first convex portions 21112 is arranged at intervals on the outer peripheral side of the first rotating roller 21111.

[0292] like Fig.25 and Fig.19As shown, when the first protrusion 21112 is continuously arranged on the outer peripheral side of the first rotating roller 21111 along the circumferential direction. Taking the first pole piece 111 compound 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 first protrusion 21112 can be set as one group or two groups. When the first protrusion 21112 is 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 compound fixed to the diaphragm 113 can also be explained in the same way.

[0293] like Fig.26 and Fig.18 As shown, when a plurality of 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 compound 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 first protrusions 21112 can be set as one group or 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 compound fixed to the diaphragm 113 can also be explained in the same way.

[0294] 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 peripheral side of the first rotating roller 21111, and the other group of first protrusions 21112 is spaced apart on the outer peripheral side of the first rotating roller 21111. It can be understood that the first rotating roller 21111 is provided with a first convex portion 21112 at both ends along the first direction Z, the first convex portion 21112 at one end of the first rotating roller 21111 along the first direction Z is continuously arranged on the outer peripheral side of the first rotating roller 21111 along the circumferential direction, and the first convex portion 21112 at the other end of the first rotating roller 21111 along the first direction Z is arranged at intervals along the circumferential direction on the outer peripheral side of the first rotating roller 21111. Taking the first pole piece 111 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 arranged, and the first composite structure a at the other end of the first pole piece 111 along the first direction Z is arranged at intervals, as shown in FIG. Fig. 20 The second pole piece 112 is compositely fixed to the diaphragm 113 and can be explained in the same way.

[0295] It should be noted here that the first protrusions 21112 are circumferentially spaced apart on the outer circumference of the first rotating roller 21111 and a group of first protrusions 21112 are spaced apart on the outer circumference of the first rotating roller 21111 refer to multiple first protrusions 21112 being spaced apart on the outer circumference of the first rotating roller 21111.

[0296] By such arrangement, the first composite structures a formed after the composite operation can be arranged continuously or at intervals, and the second composite structures b formed after the composite operation can be arranged continuously or at intervals, so that the composite effect can be very flexible.

[0297] In some embodiments, please refer to Fig.25 and Fig.26 , and combined with other drawings. In some possible designs, such as Fig.25 As shown, the second convex portion 21122 is continuously arranged on the outer peripheral side of the second rotating roller 21121 along the circumferential direction. Alternatively, in some other possible designs, such as Fig.26 As shown, the second convex portions 21122 are arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller 21121. Alternatively, in some other possible designs, the second rotating roller 21121 is provided with two groups of the second convex portions 21122, and the two groups of second convex portions 21122 are distributed at intervals along the first direction Z on the second rotating roller 21121. One group of the second convex portions 21122 is continuously arranged on the outer peripheral side of the second rotating roller 21121, and the other group of the second convex portions 21122 is arranged at intervals on the outer peripheral side of the second rotating roller 21121.

[0298] like Fig.25 and Fig.19 As shown, when the second protrusion 21122 is continuously arranged on the outer peripheral side of the second rotating roller 21121 along the circumferential direction. Taking the first pole piece 111 compound 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 protrusion 21122 can be set as one group or two groups. When the second protrusion 21122 is 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 compound fixed to the diaphragm 113 can also be explained in the same way.

[0299] like Fig.26 and Fig.18 As shown, when a plurality of 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 compound 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 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 compound fixed to the diaphragm 113 can also be explained in the same way.

[0300] Two groups of second protrusions 21122 are spaced apart on the second rotating roller 21121 along the first direction Z, wherein one group of second protrusions 21122 is continuously arranged on the outer peripheral side of the second rotating roller 21121 , and the other group of second protrusions 21122 is spaced apart on the outer peripheral side of the second rotating roller 21121 . It can be understood that the second rotating roller 21121 is provided with second convex portions 21122 at both ends along the first direction Z, the second convex portion 21122 at one end of the second rotating roller 21121 along the first direction Z is continuously arranged on the outer peripheral side of the first rotating roller 21111 along the circumferential direction, and the second convex portion 21122 at the other end of the second rotating roller 21121 along the first direction Z is arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller 21121. Taking the first pole piece 111 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 arranged, and the first composite structure a at the other end of the first pole piece 111 along the first direction Z is arranged at intervals, as shown in FIG. Fig. 20 The second pole piece 112 is compositely fixed to the diaphragm 113 and can be explained in the same way.

[0301] It should be noted here that the second protrusions 21122 are circumferentially spaced apart on the outer circumference of the second rotating roller 21121 and a group of second protrusions 21122 are spaced apart on the outer circumference of the second rotating roller 21121 refer to multiple second protrusions 21122 spaced apart on the outer circumference of the second rotating roller 21121.

[0302] By such arrangement, the first composite structures a formed after the composite operation can be arranged continuously or at intervals, and the second composite structures b formed after the composite operation can be arranged continuously or at intervals, so that the composite effect can be very flexible.

[0303] Based on the above structure, it can be understood that the first composite roller 2111 and the second composite roller 2112 cooperate so that the composite device 2100 performs a composite operation by rolling. The rolling method can be cold pressing or hot pressing.

[0304] Please also read Fig.12 and Fig. 27 , and combined with other drawings. Fig. 27 Schematic diagram of a processing device 2000 provided in some embodiments of the present application. The processing device 2000 provided in the embodiment 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.

[0305] 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, so as to improve the dynamic performance of the battery 100.

[0306] In some embodiments, please refer to Fig.12 and Fig. 27 The processing equipment 2000 further includes a winding device 2200 , which is used to wind the first pole piece 111 , the second pole piece 112 and the separator 113 to form the electrode assembly 11 .

[0307] The winding device 2200 refers to a device for winding the first pole sheet 111 , the second pole sheet 112 and the separator 113 to form the electrode assembly 11 .

[0308] With such arrangement, the electrode assembly 11 can be wound up.

[0309] In some embodiments, please refer to Fig.13 and Fig. 27 , and in combination with other drawings. The processing equipment 2000 further includes a shaping device 2300, and the shaping device 2300 is used to shape the electrode assembly 11 into a flat shape.

[0310] The shaping device 2300 is a device for shaping the electrode assembly 11 into a flat shape.

[0311] With such configuration, a flat electrode assembly 11 can be obtained.

[0312] In some embodiments, see Fig. 27 , and in combination with other drawings. The processing equipment 2000 also includes an assembly device 2400 and a stacking device 2500. The assembly device 2400 is used to assemble the electrode assembly 11 to form a battery 100 monomer, and the stacking device 2500 is used to stack the battery 100 monomers to form a battery 100.

[0313] The assembling device 2400 is a device for assembling the electrode assembly 11 and the housing etc. to form a battery 100 unit, and the stacking device 2500 is a device for stacking a plurality of battery 100 units to form a battery 100 .

[0314] With such configuration, the battery 100 can be obtained.

[0315] See also Fig.28 , and combined with other drawings. Fig.28Flowchart of the composite method provided in some embodiments of the present application. The composite method provided in the embodiments of the present application adopts 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.

[0316] The composite method involved in the embodiment of the present application comprises the following steps:

[0317] S10 , driving 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 .

[0318] Specifically, at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 can be passed through the composite device 2100 as needed, so that the composite device 2100 composites part of the whole formed by at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113, thereby performing a composite operation on part of the diaphragm 113.

[0319] The composite device 2100 may perform a composite operation on at least one of the first electrode piece 111 and the second electrode piece 112 and the diaphragm 113 through one composite mechanism 2110 , or may perform a composite operation on at least one of the first electrode piece 111 and the second electrode piece 112 and the diaphragm 113 through multiple composite mechanisms 2110 .

[0320] 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 part of the diaphragm 113 is 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.

[0321] In some embodiments, driving 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 (step S10) specifically includes the following steps:

[0322] S11, driving the first composite roller 2111 to rotate; or driving the second composite roller 2112 to rotate; or driving the first composite roller 2111 and the second composite roller 2112 to rotate, so that the first convex portion 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.

[0323] Such arrangement enables 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 overall poor 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.

[0324] In some embodiments, before the driving compound device 2100 compounds a portion of the diaphragm 113 onto the first pole piece 111 and / or the second pole piece 112 (step S10), the method further includes:

[0325] S20, a first adhesive layer 12 is provided on the diaphragm 113; and / or a second adhesive layer is provided on the first pole piece 111; and / or a third adhesive layer is provided on the second pole piece 112. It can be understood that the first adhesive layer 12 is provided on the diaphragm 113, the second adhesive layer is provided on the first pole piece 111, and the third adhesive layer is provided on the second pole piece 112. These three embodiments can be freely selected and combined according to needs.

[0326] It can be understood that the first glue layer 12 is provided on the diaphragm 113 as an example 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 glue layer 12. In other possible designs, the first glue layer 12 can also be applied on the diaphragm 113 by coating. In some other possible designs, the first glue layer 12 can also be bonded to the diaphragm 113. Correspondingly, the second glue layer is provided on the first pole piece 111 and the third glue layer is provided on the second pole piece 112, and similar solutions can also be adopted, which will not be repeated here.

[0327] In this way, the first adhesive layer 12 can be firstly arranged on the diaphragm 113, and / or the second adhesive layer can be arranged on the first pole piece 111, and / or the third adhesive layer can be arranged on the second pole piece 112. Then, at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113 are passed through the composite device 2100, so that the composite device 2100 performs a composite operation on at least one of the first pole piece 111 and the second pole piece 112 and the diaphragm 113, so that the effect of partially completing the composite operation of the diaphragm 113 can be achieved. In this way, the diaphragm 113 can achieve a relatively reliable composite fixing effect.

[0328] As one of the embodiments of this application, Figure 3 , Figure 4 , Figures 7 to 9As shown, the battery 100 monomer includes an electrode assembly 11, and 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 and wound. 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 the 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, and the second film material 1132 is disposed at both opposite ends of the first film material 1131 along the first direction Z. The first film material 1131 is disposed opposite to the second active layer 1122, and the first film material 1131 is disposed opposite to a portion of the first active layer 1112. The second film materials 1132 at both opposite ends of the first diaphragm 113a along the first direction Z are both compositely fixed to the portion of the first active layer 1112 that exceeds the second active layer 1122 along the first direction Z. One side of the second film material 1132 of the second diaphragm 113b is compositely fixed to the portion of the first active layer 1112 that exceeds the second active layer 1122 along the first direction Z, and the other side is compositely fixed to the insulating layer 1123. In addition, the second film materials 1132 at both opposite ends of the second diaphragm 113b along the first direction Z are compositely fixed to the portion of the first active layer 1112 that exceeds the second active layer 1122 along the first direction Z.

[0329] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: The invention comprises an electrode assembly, wherein the electrode assembly comprises a first pole piece, a second pole piece and a diaphragm, wherein the first pole piece and the second pole piece are alternately stacked or alternately stacked and wound; at least a portion of the diaphragm is arranged between the first pole piece and the second pole piece, and a portion of the diaphragm is compositely fixed to the first pole piece and / or the second pole piece.

2. The battery cell according to claim 1, characterized in that: The first pole piece includes a first current collector and a first active layer arranged on the first current collector, and the second pole 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, 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 pole piece and / or the second pole piece; the first direction is parallel to the first pole piece and the second pole piece.

3. The battery cell according to claim 2, characterized in that: 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.

4. The battery cell according to claim 3, characterized in that: 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.

5. The battery cell according to claim 4, characterized in that: 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.

6. The battery cell according to claim 4 or 5, characterized in that: 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 portion of the first active layer extending beyond both opposite ends of the second active layer along the first direction is compositely fixed to the second film material.

7. The battery cell according to any one of claims 3 to 6, characterized in that: 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.

8. The battery cell according to claim 7, characterized in that: At least a portion of the second film material is compositely fixed to the insulating layer.

9. The battery cell according to claim 8, characterized in that: At least one side or two opposite sides of a portion of the insulating layer are compositely fixed to the second film material.

10. The battery cell according to any one of claims 7 to 9, characterized in that: The second current collector is provided with a second pole tab, and the second pole tab 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 pole tab.

11. The battery cell according to any one of claims 2 to 10, characterized in that: The first current collector is provided with a first pole ear, and the first pole ear 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 ear; the second pole ear is located at one end of the second active layer along the first direction close to the first pole ear, or the second pole ear is located at one end of the second active layer along the first direction away from the first pole ear.

12. The battery cell according to any one of claims 2 to 11, characterized in that: 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; 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.

13. The battery cell according to any one of claims 2 to 12, characterized in that: The second film material is disposed 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.

14. The battery cell according to any one of claims 2 to 13, characterized in that: The second film material is combined with the first pole piece to form a first composite structure; the first composite structures at each end of the first pole piece in the first direction are arranged at intervals or continuously, or the first pole piece forms two groups of the first composite structures spaced apart and distributed along the first direction, one group of the first composite structures is arranged at intervals, and the other group of the first composite structures is arranged continuously.

15. The battery cell according to any one of claims 2 to 14, characterized in that: 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.

16. The battery cell according to any one of claims 1 to 15, characterized in that: The diaphragm includes a substrate and an adhesive layer disposed on two opposite sides of the substrate, and the diaphragm is bonded to the first pole piece and / or the second pole piece through the adhesive layer to be compositely fixed to the first pole piece and / or the second pole piece; And / or, the electrode assembly further comprises a first adhesive layer disposed on the diaphragm, and the diaphragm is bonded to the first pole piece and / or the second pole piece through the first adhesive layer to be compositely fixed to the first pole piece and / or the second pole piece; And / or, the electrode assembly further comprises a second adhesive layer disposed on the first electrode piece, and the first electrode piece is bonded to the diaphragm through the second adhesive layer to be compositely fixed to the diaphragm; And / or, the electrode assembly further includes a third adhesive layer disposed on the second pole piece, and the second pole piece is bonded to the diaphragm through the third adhesive layer to be compositely fixed to the diaphragm.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The first pole sheet and the second pole sheet are stacked and wound, and the electrode assembly is flat or cylindrical.

18. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-17.

19. An electrical device, characterized in that: The method comprises a battery cell according to any one of claims 1 to 17 or a battery according to claim 18.

20. A composite device, applied to a battery cell according to any one of claims 1 to 17; characterized in that: The composite device is used to composite and fix part of the diaphragm to the first pole piece and / or the second pole piece.

21. The composite device according to claim 20, characterized in that The composite device includes a composite mechanism for performing composite operations; the number of the composite mechanism is one, or the number of the composite mechanism is multiple, and the multiple composite mechanisms are used to perform composite operations in sequence.

22. The composite device according to claim 21, characterized in that 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 convex portion arranged on the outer peripheral side of the first rotating roller, the first convex portion and the second composite roller are used to cooperate in a rolling composite operation, the first convex portion and the second composite roller are spaced to form a rolling gap, and the first convex portion and the first rotating roller define a first avoidance space connected to the rolling gap.

23. The composite device according to claim 22, characterized in that The second composite roller includes a second rotating roller and a second convex portion arranged on the outer circumference of the second rotating roller, the second convex portion is arranged opposite to the first convex portion and is spaced to form the rolling gap; the second convex portion and the second rotating roller define a second avoidance space connected to the rolling gap.

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

25. The composite device according to claim 23, characterized in that 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 the first protrusions distributed at intervals, one group of the second protrusions is continuously arranged along the circumferential direction on the outer peripheral side of the second rotating roller, and the other group of the second protrusions is arranged at intervals along the circumferential direction on the outer peripheral side of the second rotating roller.

26. A processing device for processing batteries; characterized in that: The processing equipment comprises a composite device according to any one of claims 20-25.

27. The processing equipment according to claim 26, characterized in that The processing equipment also includes: A winding device is used to wind the first pole piece, the second pole piece and the diaphragm to form the electrode assembly.

28. The processing equipment according to claim 27, characterized in that The processing equipment also includes a shaping device, which is used to shape the electrode assembly into a flat shape.

29. The processing equipment according to claim 27 or 28, characterized in that The processing equipment also includes: An assembling device, used for assembling the electrode assembly to form the battery cell; The stacking device is used to stack the battery cells to form a battery.

30. A composite method, using the composite device according to any one of claims 20 to 25, characterized in that: The composite method comprises: The driving compound device composites and fixes a part of the diaphragm to the first pole piece and / or the second pole piece.

31. The composite method according to claim 30, characterized in that: The driving composite device compositely fixes part of the diaphragm to the first pole piece and / or the second pole piece, including: The first composite roller and / or the second composite roller are driven to rotate, so that the first convex portion on the first composite roller cooperates with the second composite roller to roll at least one of the first pole piece and the second pole piece and the diaphragm.

32. The composite method according to claim 30 or 31, characterized in that: Before the driving composite device composites part of the diaphragm onto the first pole piece and / or the second pole piece, the driving composite device further comprises: A first glue layer is provided on the diaphragm, and / or a second glue layer is provided on the first pole piece, and / or a third glue layer is provided on the second pole piece.

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