Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly accommodated in a shell, and the electrode assembly comprises a first pole piece and a second pole piece which are opposite in polarity. The first pole piece comprises a first current collector, a first active material layer and a first insulating layer, the first current collector comprises a first coating region, a first blank region and a first tab region, the first active material layer is arranged in the first coating region, and the first active material layer is not arranged in the first blank region and the first tab region; the first tab area and the first blank area are arranged on the two sides of the first coating area. The first insulating layer is arranged in the first blank area, and the first insulating layer exceeds the end face, away from the first coating area, of the first blank area in the direction from the first coating area to the first blank area.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Art

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] In the development of battery technology, how to improve the reliability of battery cells is a research direction in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can improve the reliability of the battery cell.

[0005] On the one hand, an embodiment of the present application provides a battery cell, comprising an electrode assembly housed in a housing, the electrode assembly comprising a first pole piece and a second pole piece of opposite polarity. The first pole piece comprises a first current collector, a first active material layer, and a first insulating layer. The first current collector comprises a first coating region, a first blank region, and a first tab region. The first active material layer is disposed in the first coating region. Neither the first blank region nor the first tab region is provided with the first active material layer. The first tab region and the first blank region are disposed on either side of the first coating region. The first insulating layer is disposed in the first blank region, extending from the first coating region toward the first blank region, and the first insulating layer extends beyond the first blank region and away from the end face of the first coating region.

[0006] In the above solution, the dimensions of the first current collector are adjusted to provide a first blank area, not covered by the first active material layer, on the side of the first coating region away from the first tab region. Furthermore, a first insulating layer comprising an insulating material is added. This layer extends from the first coating region toward the first blank area, extending beyond the end face of the first blank area away from the first coating region. This provides a protective covering for this end face, thereby reducing the risk of this end face being punctured by burrs on the second electrode sheet, potentially causing a short circuit, and improving the reliability of the battery cell.

[0007] Furthermore, since the first insulating layer is arranged in the first blank area, the first insulating layer can be directly bonded to the first current collector. Compared with the solution in which the first insulating layer is directly bonded to the first active material layer, this helps to reduce the difficulty of preparing the first insulating layer, and can also reduce the degree of shielding of the first active material layer by the first insulating layer, that is, reduce the impact of the first insulating layer on the capacity of the battery cell and improve the performance reliability of the battery cell.

[0008] In some embodiments, in the thickness direction of the first pole piece, the projection of the first insulating layer is located outside the projection of the first active material layer.

[0009] In the above scheme, the first insulating layer is completely located outside the first coating area and does not contact the surface of the first active material layer facing away from the first current collector. In this way, during the use of the battery cell, the presence of the first insulating layer will not block the charge transfer path, thereby helping to improve the battery cell's own capacity performance.

[0010] In some embodiments, the first insulating layer includes a first sublayer and a second sublayer disposed on both sides of the first current collector in the thickness direction of the first pole piece, and a connecting portion connecting the first sublayer and the second sublayer, wherein the connecting portion covers the end surface.

[0011] In the above solution, the first sublayer and the second sublayer can provide a covering and protective effect on the two surfaces of the first blank area in the thickness direction of the first electrode, reducing the risk of puncture caused by burrs on the second electrode at these two surfaces. In addition to connecting the first sublayer and the second sublayer, the connecting portion can also provide a covering and protective effect on the end surface, thereby reducing the risk of puncture caused by burrs on the second electrode at the end surface. In addition, the first sublayer, the second sublayer, and the connecting portion can respectively contact and adhere to different surfaces on the first current collector, thereby helping to improve the positional reliability between the first insulating layer and the first current collector.

[0012] In some embodiments, in some embodiments, the first insulating layer includes two independently formed insulating parts, one of which includes a first sublayer and a first connecting portion, and the other insulating part includes a second sublayer and a second connecting portion, and the first connecting portion and the second connecting portion are stacked to form a connecting portion.

[0013] In the above solution, two insulating members can be attached to the first current collector from opposite sides of the first blank area to form a first insulating layer. This can improve the protection effect of the first insulating layer on the first blank area while reducing the difficulty of preparing the first insulating layer.

[0014] In some embodiments, the first active material layer includes a first surface facing away from the first current collector, the first insulating layer includes a second surface facing away from the first current collector, and in the thickness direction of the first electrode sheet, the maximum distance between the first surface and the first current collector is greater than or equal to the maximum distance between the second surface and the first current collector.

[0015] In the above scheme, the maximum distance between the first surface and the first current collector is not less than the maximum distance between the second surface and the first current collector, that is, in the thickness direction of the first electrode sheet, the first insulating layer will not exceed the first active material layer. This can reduce the influence of the existence of the first insulating layer on the overall thickness of the first electrode sheet, thereby helping to reduce the influence of the first insulating layer on the capacity of the battery cell and improve the performance of the battery cell.

[0016] In some embodiments, in the thickness direction of the first pole piece, the maximum distance between the second surface and the first current collector is H2, and H2 satisfies: 3 μm≤H2≤20 μm.

[0017] In the above solution, by setting the maximum distance H2 between the second surface and the first current collector to no less than 3 μm, the first insulating layer can have a certain thickness, thereby reducing the risk of burrs penetrating the first insulating layer and damaging the first current collector, and meeting the first insulating layer's protection requirements for the first blank area and its end surface. Furthermore, the maximum distance H2 between the second surface and the first current collector is set to no more than 20 μm to reduce the adverse effects of an excessively thick first insulating layer on the overall size and weight of the first pole piece. This helps reduce the impact of the first insulating layer on the battery cell capacity and improves the battery cell's performance.

[0018] In some embodiments, the material in the first insulating layer and the material in the first active material layer are immiscible with each other.

[0019] In the above scheme, the material in the first insulating layer is restricted so that the material in the first insulating layer and the material in the first active material layer are immiscible with each other. In this way, even if the first insulating layer and the first active material layer come into contact, the material in the first insulating layer will not penetrate into the first active material layer, thereby improving the performance reliability of the first active material layer.

[0020] In some embodiments, the material of the first insulating layer includes at least one of polyethylene terephthalate, polypropylene, polytetrafluoroethylene, polyethylene, and polyvinylidene fluoride.

[0021] In the above solution, by configuring the first insulating layer to include at least one of polyethylene terephthalate, polypropylene, polytetrafluoroethylene, polyethylene, and polyvinylidene fluoride, the first insulating layer not only provides insulation protection but also is immiscible with the first active material layer, thereby improving the performance and reliability of the battery cell. Furthermore, the above materials can be used to form a tape structure that is attached to the first blank area, thereby simplifying the installation process for the first insulating layer.

[0022] In some embodiments, the first blank area is located on one side of the coating area along the first direction, and a size of the first blank area in the first direction is L1, where L1 satisfies: 1 mm ≤ L1 < 10 mm.

[0023] In the above solution, by setting the dimension L1 of the first blank area in the first direction to no less than 1 mm, the first blank area can have a certain size in the first direction, thereby ensuring the attachment and fixation of the first insulating layer to the first blank area, and improving the reliability of the first insulating layer's position relative to the first blank area. Furthermore, by setting the dimension L1 of the first blank area in the first direction to less than 10 mm, the impact of the first blank area on the overall dimension of the first current collector in the first direction is reduced, which also helps reduce the dimension of the first insulating layer in the first direction. This, in turn, reduces the impact of the first blank area and the first insulating layer on the overall capacity of the battery cell, thus providing strong practicality.

[0024] In some embodiments, the first blank area is located on one side of the first coating area along the first direction, and a dimension of the first insulating layer in the first direction is L2, where L2 satisfies: 1 mm < L2 ≤ 10 mm.

[0025] In the above solution, by setting the dimension L2 of the first insulating layer in the first direction to be greater than 1 mm, the minimum dimension of the first insulating layer is ensured to exceed the minimum dimension of the first blank area. This ensures that the first insulating layer provides protective coverage of the end face, reduces the risk of short circuits between the first and second pole pieces, and improves the reliability of the battery cell. Furthermore, by setting the dimension L2 of the first insulating layer in the first direction to be no greater than 10 mm, the impact of the first insulating layer on the overall capacity of the battery cell is reduced, thereby improving the performance of the battery cell.

[0026] In some embodiments, a dimension of the first insulating layer extending beyond the first blank area in the first direction is L3, and L3 satisfies: 0.1 mm≤L3≤5 mm.

[0027] In the above solution, the dimension of the first insulating layer extending beyond the first blank area is the dimension of the connecting portion in the first direction. By setting the dimension L3 of the first insulating layer extending beyond the first blank area in the first direction to be no less than 0.1 mm, the connecting portion has a certain dimension in the first direction to cover and protect the end face, reducing the risk of burrs penetrating the connecting portion and damaging the end face. Furthermore, by setting the dimension L3 of the first insulating layer extending beyond the first blank area in the first direction to no more than 5 mm, the impact of the first insulating layer on the overall capacity of the battery cell is reduced, thereby improving the performance of the battery cell.

[0028] In some embodiments, the first current collector further includes a second blank area between the first coating area and the first tab area, and the battery cell further includes a second insulating layer, which is at least partially disposed in the second blank area.

[0029] In the above solution, the presence of the second insulating layer can cover and protect the surface and side of the second blank area, thereby reducing the risk of short circuit between the first electrode and the second electrode in the second blank area and improving the reliability of the battery cell.

[0030] In some embodiments, the active material layer includes a first surface facing away from the first current collector, the second insulating layer has a third surface facing away from the first current collector, and in the thickness direction of the first electrode sheet, the maximum distance between the first surface and the first current collector is greater than or equal to the maximum distance between the third surface and the first current collector.

[0031] In the above scheme, the maximum distance between the first surface and the first current collector is not less than the maximum distance between the third surface and the first current collector, that is, in the thickness direction of the first electrode sheet, the second insulating layer will not exceed the first active material layer. This can reduce the influence of the existence of the second insulating layer on the overall thickness of the first electrode sheet, thereby helping to reduce the influence of the second insulating layer on the capacity of the battery cell and improve the performance of the battery cell.

[0032] In some embodiments, the first active material layer includes a central portion and a first edge portion located on a side of the central portion close to the second blank region, wherein the central portion is thicker than the first edge portion. The second insulating layer is partially located on a side of the first edge portion away from the first current collector.

[0033] In the above solution, the second insulating layer can be partially disposed in the second blank area and partially disposed on the side of the first edge portion facing away from the first current collector. Furthermore, because the thickness of the first edge portion is less than that of the center portion, the portion of the second insulating layer located on the side of the first edge portion facing away from the first current collector will not extend beyond the surface of the center portion facing away from the first current collector. This design does not adversely affect the overall thickness of the first electrode sheet, while also helping to increase the size of the second insulating layer in the first direction and improve the corresponding coverage and protection effect of the second insulating layer, thereby improving the reliability of the battery cell.

[0034] In some optional embodiments, the first electrode is a positive electrode, and the second electrode is a negative electrode.

[0035] In the above solution, by adding a first insulating layer to the positive electrode sheet, the end surface is covered and protected, thereby reducing the risk of the end surface being punctured by burrs on the negative electrode sheet, thereby causing a short circuit, and improving the reliability of the battery cell. Furthermore, a second insulating layer can be added to the positive electrode sheet to cover and protect the side of the second blank area away from the first coated area, thereby further reducing the risk of short circuits and improving the reliability of the battery cell.

[0036] In some embodiments, the second pole piece includes a second current collector and a second active material layer, the second current collector includes a second coating region and a second tab region, and the second active material layer is disposed in the second coating region. In the thickness direction of the first pole piece, a projection of the first insulating layer overlaps with an interface between the second coating region and the second tab region.

[0037] In the above scheme, in the thickness direction of the first pole piece, the projection of the first insulating layer overlaps with the interface between the second coating area and the second pole ear area, so that the first insulating layer can block the burrs generated by the second pole piece at the interface, reduce the risk of short circuit between the first pole piece and the second pole piece, and improve the reliability of the battery cell.

[0038] In some embodiments, there are multiple first pole pieces and multiple second pole pieces, and the multiple first pole pieces and the multiple second pole pieces are alternately stacked.

[0039] In the above solution, a first insulating layer comprising an insulating material is added to the first pole piece. Along the direction of the first coating area pointing to the first blank area, the first insulating layer can extend beyond the first blank area and away from the end face of the first coating area, thereby covering and protecting the end face, thereby reducing the risk of the end face being punctured by burrs on the second pole piece and causing a short circuit problem, thereby improving the reliability of the battery cell.

[0040] In a second aspect, an embodiment of the present application provides a battery device, which includes a battery cell in any of the aforementioned embodiments.

[0041] In a third aspect, an embodiment of the present application provides an electrical device, which includes a battery cell in any of the aforementioned embodiments, or a battery device in any of the aforementioned embodiments, wherein the battery cell or the battery device is used to provide electrical energy.

[0042] 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

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. 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 creative work.

[0044] Figure 1 This is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0045] Figure 2 This is a schematic diagram of the exploded structure of a battery device provided in an embodiment of the present application;

[0046] Figure 3 This is a schematic diagram of the internal structure of a battery module provided in an embodiment of the present application;

[0047] Figure 4 This is a schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application;

[0048] Figure 5 is a schematic cross-sectional structure diagram of an electrode assembly in a battery cell provided in an embodiment of the present application;

[0049] Figure 6 is a partial cross-sectional schematic diagram of an electrode assembly in a battery cell provided in an embodiment of the present application;

[0050] Figure 7 is a partial cross-sectional schematic diagram of an electrode assembly in a battery cell provided in an embodiment of the present application;

[0051] Figure 8 is a partial cross-sectional schematic diagram of another electrode assembly in a battery cell provided in an embodiment of the present application;

[0052] Figure 9 is a partial cross-sectional schematic diagram of another electrode assembly in a battery cell provided in an embodiment of the present application;

[0053] Figure 10 is a partial cross-sectional schematic diagram of another electrode assembly in a battery cell provided in an embodiment of the present application;

[0054] Figure 11 This is a structural schematic diagram of the first pole piece in another battery cell provided in an embodiment of the present application.

[0055] In the attached figure:

[0056] 1000, vehicle;

[0057] 100, battery device; 200, controller; 300, motor; 400, housing; 401, first housing portion; 402, second housing portion; 500, battery cell; 600, battery module;

[0058] 10. Housing; 11. Shell; 12. End cover;

[0059] 20. Electrode assembly;

[0060] 30. First pole piece; 31. First current collector; 32. First active material layer; 321. Center portion; 322. First edge portion; 323. Second edge portion; 33. First insulating layer; 331. First sublayer; 332. Second sublayer; 333. Connecting portion; 334. Insulating member; 335. First connecting portion; 336. Second connecting portion; 34. Second insulating layer;

[0061] 40. Second pole piece; 41. Second current collector; 42. Second active material layer;

[0062] A1, first coating area; A2, first tab area; A3, first blank area; A4, second blank area; A5, second coating area; A6, second tab area;

[0063] M1, first surface; M2, second surface; M3, third surface; M4, end surface; M5, interface;

[0064] X, first direction; Y, second direction; Z, thickness direction. DETAILED DESCRIPTION

[0065] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0067] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0068] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0069] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0070] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0071] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0072] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0073] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0074] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 cannot be understood as a limitation on the embodiments of the present application.

[0075] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0076] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0077] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0078] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0079] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0080] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0081] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, or a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co At least one of LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.8Co0.15Al0.05O2), and modified compounds thereof. Modified compounds refer to substances obtained by modifying the above substances through doping or coating.

[0083] In some embodiments, a metal foam may be used as the positive electrode. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, the positive electrode active material may be filled and / or deposited within the metal foam.

[0084] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0085] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, or a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0086] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0087] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0088] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0089] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0090] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0091] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0092] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0093] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0094] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. The surface of the separator can also be coated with an inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating.

[0095] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0096] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0097] The liquid electrolyte includes an electrolyte salt and a solvent.

[0098] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0099] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0100] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives capable of improving certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0101] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0102] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0103] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0104] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphide, germanium silver sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0105] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0106] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0107] In some embodiments, the electrode assembly is a laminated structure. As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0108] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0109] In some embodiments, the battery cell may include an outer shell. The outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0110] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0111] In some embodiments, a current collecting member may be disposed in the housing, and the electrode assembly may be electrically connected to the housing or electrode terminals disposed on the housing through the current collecting member.

[0112] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0113] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0114] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0115] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0116] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0117] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0118] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0119] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0120] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0121] In some embodiments, the battery device may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0122] During the preparation of electrodes (positive or negative), cutting (e.g., electrode slitting or tab die-cutting) is typically required to achieve the desired size and shape. However, after cutting, burrs are prone to form on the current collector at the cutting locations. During the charge and discharge process of the battery cell, these burrs may puncture the separator and connect the positive and negative electrodes, causing a short circuit risk and affecting the reliability of the battery cell.

[0123] Based on the above technical problems, the present application provides a battery cell, a battery device and an electrical device. By setting the first blank area in the first pole piece beyond the first coating area, and making the first insulating layer extend beyond the first blank area and away from the end face of the first coating area, the first insulating layer can be used to protect the end face, thereby blocking the adverse effects of burrs on the current collector at the corresponding cutting position on the first pole piece, reducing the risk of burrs causing conduction of the positive and negative pole pieces, and improving the reliability of the battery cell.

[0124] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0125] The cylindrical battery cells described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0126] See also Figure 1 , Figure 1A simple schematic diagram of a vehicle 1000 provided in an embodiment of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 may be provided inside the vehicle 1000. Specifically, for example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used, for example, to control the battery to power the motor 300. The battery device 100 may be used for starting and navigating the vehicle 1000. Of course, the battery device 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0127] Figure 2 Schematic diagram of an explosion of a battery device provided in some embodiments of the present application. Figure 2 As shown, the battery device 100 includes a box body 400 and battery cells (not shown in the figure), and the battery cells are accommodated in the box body 400.

[0128] The housing 400 is used to accommodate battery cells and can have various structures. In some embodiments, the housing 400 can include a first housing portion 401 and a second housing portion 402. The first housing portion 401 and the second housing portion 402 overlap each other, and the first housing portion 401 and the second housing portion 402 together define a housing for accommodating battery cells. The second housing portion 402 can be a hollow structure with one end open. The first housing portion 401 is a plate-like structure, and the first housing portion 401 overlaps the open side of the second housing portion 402 to form a housing with a housing. The first housing portion 401 and the second housing portion 402 can also be hollow structures with one end open. The open side of the first housing portion 401 overlaps the open side of the second housing portion 402 to form the housing 400 with a housing. Of course, the first housing portion 401 and the second housing portion 402 can have various shapes, such as cylinders, rectangular parallelepipeds, etc.

[0129] In the battery device 100, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery module can be housed within the housing 400. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid configuration to form a battery module 600, and then the battery modules 600 can be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 400.

[0130] Figure 3 for Figure 2 Schematic diagram of the structure of the battery module 600 shown in FIG. Figure 3 As shown, there are multiple battery cells 500, which are first connected in series, in parallel, or in series to form a battery module 600. The multiple battery modules 600 are then connected in series, in parallel, or in series to form a whole, which is then housed in a box.

[0131] Next, the structure of the battery cell will be described with reference to the accompanying drawings.

[0132] See also Figures 4 to 8 The battery cell 500 includes an electrode assembly 20 housed within a housing 10. The electrode assembly 20 includes a first electrode sheet 30 and a second electrode sheet 40 of opposite polarity. The first electrode sheet 30 includes a first current collector 31, a first active material layer 32, and a first insulating layer 33. The first current collector 31 includes a first coating area A1, a first blank area A3, and a first tab area A2. The first active material layer 32 is disposed in the first coating area A1. Neither the first blank area A3 nor the first tab area A2 is provided with the first active material layer 32. The first tab area A2 and the first blank area A3 are disposed on either side of the first coating area A1. The first insulating layer 33 is disposed in the first blank area A3, extending from the first coating area A1 toward the first blank area A3. The first insulating layer 33 extends beyond the first blank area A3 and extends away from the end surface M4 of the first coating area A1.

[0133] The battery cell 500 is a device for providing electrical energy. The battery cell 500 is provided with a housing 10. The housing 10 is a hollow structure, and the housing 10 can protect other components located therein. Specifically, the housing 10 can include a shell 11 having an opening and an end cap 12. The end cap 12 covers the opening of the shell 11 and forms a storage space. The electrode assembly 20 is disposed in the storage space of the housing 10, and the housing 10 can protect the electrode assembly 20. Among them, the electrode assembly 20 is the core component for realizing the storage or release of electrical energy of the cylindrical battery cell 500.

[0134] The shape of the housing 10 can be determined based on the specific shape of the electrode assembly 20. That is, the shape of the housing 10 can be adapted to the shape of the electrode assembly 20. For example, when the electrode assembly 20 has a cylindrical structure, a cylindrical housing 10 can be selected; when the electrode assembly 20 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 10 can be selected. Alternatively, depending on actual needs, the shape of the housing 10 can also be different from the shape of the electrode assembly 20. For example, when the electrode assembly 20 has a cylindrical structure, the housing 10 can have a rectangular parallelepiped structure or other polygonal structure; when the electrode assembly 20 has a rectangular parallelepiped structure, the housing 10 can have a cylindrical structure.

[0135] In some embodiments, the housing 10 can be a sealed structure or a non-sealed structure. As an example, when the housing 10 is a sealed structure, the housing 10 can protect the electrode assembly 20 and prevent electrolyte leakage to a certain extent. When the housing 10 is a non-sealed structure, the housing 10 can protect the electrode assembly 20. A sealing bag can be included between the housing 10 and the electrode assembly 20 to encapsulate the electrode assembly 20 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member 334 or an aluminum-plastic film.

[0136] The electrode assembly 20 can have various forms, for example, the electrode assembly 20 has a wound structure. For example, the first electrode sheet 30 and the second electrode sheet 40 are both strip-shaped structures, and the first electrode sheet 30, the second electrode sheet 40, and the separator are wound together to form the wound structure. Alternatively, the electrode assembly 20 can have a laminated structure, and multiple first electrode sheets 30 and multiple second electrode sheets 40 can be provided, with multiple first electrode sheets 30 and multiple second electrode sheets 40 alternately stacked. The figure illustrates the case where the electrode assembly 20 has a laminated structure.

[0137] The first electrode sheet 30 includes a first current collector 31, a first active material layer 32, and a first insulating layer 33. For example, the first electrode sheet 30 may be a positive electrode sheet, in which case the first current collector 31 is a positive electrode current collector and the first active material layer 32 is a positive electrode active material layer. Alternatively, the first electrode sheet 30 may be a negative electrode sheet, in which case the first current collector 31 is a negative electrode current collector and the first active material layer 32 is a negative electrode active material layer.

[0138] The first current collector 31 includes a first coating area A1, a first blank area A3, and a first tab area A2. The first coating area A1 is the area on the first current collector 31 for disposing the first active material layer 32. The first active material layer 32 can be disposed on one or both sides of the first current collector 31 along the thickness direction Z of the first electrode sheet 30. The first tab area A2 is the area for forming the tab corresponding to the first electrode sheet 30, and the first active material layer 32 is not disposed on the first tab area A2. The first tab area A2 can be disposed adjacent to the first coating area A1, or other areas can exist between the first tab area A2 and the first coating area A1.

[0139] The first blank area A3 and the first tab area A2 are located on either side of the first coating area A1. That is, the first blank area A3 is located on the side of the first coating area A1 away from the first tab area A2. Furthermore, the first blank area A3 is also the area on the first current collector 31 where the first active material layer 32 is not disposed.

[0140] In the related art, there is no area corresponding to the first blank area A3 on the positive electrode plate and the negative electrode plate, that is, the electrode plate only includes a coating area and a tab area, and the coating area on the surface of one of the electrode plates away from the tab area is easily punctured by the burrs on the other electrode plate, thereby easily causing a short circuit problem between the positive and negative electrode plates, affecting the reliability of the battery cell 500.

[0141] In the embodiment of the present application, the size of the first current collector 31 is adjusted so that the first current collector 31 has a first blank area A3 not covered by the first active material layer 32 on the side of the first coating area A1 away from the first tab area A2. Furthermore, a first insulating layer 33 comprising an insulating material is added, extending from the first coating area A1 toward the first blank area A3. The first insulating layer 33 extends beyond the end surface M4 of the first blank area A3 away from the first coating area A1, thereby providing a protective covering for the end surface M4. This reduces the risk of the end surface M4 being punctured by burrs on the second pole piece 40, potentially causing a short circuit, and improves the reliability of the battery cell 500.

[0142] Furthermore, since the first insulating layer 33 is arranged in the first blank area A3, the first insulating layer 33 can be directly bonded to the first current collector 31. Compared with the solution in which the first insulating layer 33 is directly bonded to the first active material layer 32, this helps to reduce the difficulty of preparing the first insulating layer 33, and can also reduce the degree of shielding of the first insulating layer 33 to the first active material layer 32, that is, reduce the impact of the first insulating layer 33 on the capacity of the battery cell 500, and improve the performance reliability of the battery cell 500.

[0143] It should be noted that the first insulating layer 33 can be composed of a variety of materials, depending on the actual situation, as long as the first insulating layer 33 can meet the insulation requirements and protect the first blank area A3 and the end surface M4. The first insulating layer 33 can also be formed in a variety of ways. For example, the first insulating layer 33 can be formed in the first blank area A3 by coating, or by bonding, as long as the first insulating layer 33 does not adversely affect the performance of the first active material layer 32 during and after its formation.

[0144] In some optional embodiments, the first insulating layer 33 can be formed in the first blank area A3 by bonding. This method can improve the position accuracy of the first insulating layer 33, reduce the adverse effects of the existence of the first insulating layer 33 and its preparation process on the first active material layer 32, and help improve the reliability of the capacity performance of the battery cell 500 itself.

[0145] In addition, if Figure 8As shown, in the thickness direction Z of the first electrode 30, the first insulating layer 33 can be provided only on one side of the first current collector 31, or as shown in FIG. Figure 7 As shown, it can also be disposed on both sides of the first current collector 31. As long as the first insulating layer 33 can satisfy the direction from the first coating area A1 to the first blank area A3, the first insulating layer 33 can exceed and cover the end surface M4.

[0146] In some embodiments, as Figures 4 to 8 As shown, in the thickness direction Z of the first electrode 30, the projection of the first insulating layer 33 is located outside the projection of the first active material layer 32. In other words, along the direction from the first blank area A3 to the first coating area A1, the first insulating layer 33 does not extend beyond the end of the first coating area A1 facing the first blank area A3.

[0147] In the embodiment of the present application, the first insulating layer 33 is completely located outside the first coating area A1 and does not contact the surface of the first active material layer 32 that is away from the first current collector 31. In this way, during the use of the battery cell 500, the presence of the first insulating layer 33 will not block the charge transfer path, thereby helping to improve the capacity performance of the battery cell 500 itself.

[0148] In some embodiments, as Figure 6 and Figure 7 As shown, the first insulating layer 33 includes a first sublayer 331 and a second sublayer 332 arranged on both sides of the first current collector 31 in the thickness direction Z of the first pole piece 30, and a connecting portion 333 connecting the first sublayer 331 and the second sublayer 332, and the connecting portion 333 is arranged to cover the end surface M4.

[0149] In the thickness direction Z of the first pole piece 30, the projections of the first sublayer 331 and the second sublayer 332 are both located within the first blank area A3, and the first sublayer 331 and the second sublayer 332 are disposed on either side of the first current collector 31. The shape and size of the first sublayer 331 can be the same as or different from those of the second sublayer 332. Optionally, the projections of the first sublayer 331 and the second sublayer 332 in the thickness direction Z of the first pole piece 30 are both rectangular, and their corresponding projections are arranged overlappingly.

[0150] The connecting portion 333 is used to connect the first sublayer 331 and the second sublayer 332. The first sublayer 331 and the second sublayer 332 are relatively fixed by the connecting portion 333. The connecting portion 333 is located outside the first current collector 31 and on the side of the first blank area A3 away from the first coating area A1. That is, in the thickness direction Z of the first pole piece 30, the projection of the connecting portion 333 is located outside the projection of the first current collector 31 and is adjacent to the first blank area A3.

[0151] In the embodiment of the present application, the first sublayer 331 and the second sublayer 332 can provide a covering and protective effect on the two surfaces of the first blank area A3 in the thickness direction Z of the first pole piece 30, thereby reducing the risk of puncture caused by burrs on the second pole piece 40 at these two surfaces. In addition to being used to connect the first sublayer 331 and the second sublayer 332, the connecting portion 333 can also provide a covering and protective effect on the end surface M4, thereby reducing the risk of puncture caused by burrs on the second pole piece 40 at the end surface M4. In addition, the first sublayer 331, the second sublayer 332 and the connecting portion 333 can respectively contact and adhere to different surfaces on the first current collector 31, thereby helping to improve the positional reliability between the first insulating layer 33 and the first current collector 31.

[0152] In some embodiments, in some embodiments, as Figure 6 and Figure 7 As shown, the first insulating layer 33 includes two independently formed insulating parts 334, one of which includes a first sublayer 331 and a first connecting part 335, and the other insulating part 334 includes a second sublayer 332 and a second connecting part 336. The first connecting part 335 and the second connecting part 336 are stacked to form a connecting part 333.

[0153] The insulating member 334 is an independent component that can be prepared separately relative to the first current collector 31 and the first active material layer 32. Two insulating members 334 are provided. The two insulating members 334 can be attached to the first current collector 31 from both sides of the first pole piece 30 in the thickness direction Z, and contact and fit on the side of the first blank area A3 away from the first coating area A1, that is, outside the first current collector 31 to achieve connection and fixation between the two insulating members 334.

[0154] On this basis, one of the two insulating members 334 may include a first sublayer 331 to protect one surface of the first blank area A3 in the thickness direction Z, while the other insulating member 334 may include a second sublayer 332 to protect the other surface of the first blank area A3 in the thickness direction Z. Furthermore, the first connecting portion 335 and the second connecting portion 336 of the two insulating members 334 may jointly constitute a connecting portion 333, thereby achieving a connection and fixation between the two insulating members 334 while also protecting the end surface M4.

[0155] In an embodiment of the present application, two insulating members 334 can be attached to the first current collector 31 from opposite sides of the first blank area A3 to form a first insulating layer 33. This can improve the protection effect of the first insulating layer 33 on the first blank area A3 while reducing the difficulty of preparing the first insulating layer 33.

[0156] In some embodiments, as Figure 6 and Figure 7 As shown, the first active material layer 32 includes a first surface M1 facing away from the first current collector 31, and the first insulating layer 33 has a second surface M2 facing away from the first current collector 31. In the thickness direction Z of the first electrode sheet 30, the maximum distance H1 between the first surface M1 and the first current collector 31 is greater than or equal to the maximum distance H2 between the second surface M2 and the first current collector 31.

[0157] The first surface M1 is the surface of the first active material layer 32 facing away from the first current collector 31. The maximum distance H1 between the first surface M1 and the first current collector 31 is the maximum thickness of the first active material layer 32. Due to factors such as processing, the first surface M1 may not be completely flat. Specifically, the first active material layer 32 may include a central portion 321, a first edge portion 322 located on the side of the central portion 321 close to the first tab area A2, and a second edge portion 323 located on the side of the central portion 321 close to the first blank area A3.

[0158] Due to the influence of the preparation process for the first active material layer 32, the thickness of the center portion 321 and the second edge portion 323 can be consistent at all locations, and the thickness of the center portion 321 and the second edge portion 323 are the same. The thickness of the first edge portion 322 gradually decreases away from the center portion 321, that is, toward the first tab area A2. Based on this, the first surface M1 can be a flat surface at the center portion 321 and the second edge portion 323, and an inclined surface at the first edge portion 322. Given this, the maximum distance between the first surface M1 and the first current collector 31 can be the thickness of the center portion 321.

[0159] The second surface M2 is the surface of the first insulating layer 33 facing away from the first current collector 31. The maximum distance H2 between the second surface M2 and the first current collector 31 is the maximum thickness of the first sublayer 331. Optionally, the thickness of the first sublayer 331 at different locations remains consistent, so that the second surface M2 can be a flat surface.

[0160] In the embodiment of the present application, the maximum distance H1 between the first surface M1 and the first current collector 31 is not less than the maximum distance H2 between the second surface M2 and the first current collector 31, that is, in the thickness direction Z of the first electrode sheet 30, the first insulating layer 33 will not exceed the first active material layer 32. This can reduce the impact of the existence of the first insulating layer 33 on the overall thickness of the first electrode sheet 30, thereby helping to reduce the impact of the first insulating layer 33 on the capacity of the battery cell 500 and improve the performance of the battery cell 500.

[0161] In some embodiments, in the thickness direction Z of the first pole piece 30 , the maximum distance between the second surface M2 and the first current collector 31 is H2 , and H2 satisfies: 3 μm ≤ H2 ≤ 20 μm. Optionally, H2 is one of 3 μm, 8 μm, 10 μm, 15 μm, and 20 μm.

[0162] In the embodiment of the present application, by setting the maximum distance H2 between the second surface M2 and the first current collector 31 to no less than 3 μm, the first insulating layer 33 can have a certain thickness. This reduces the risk of burrs penetrating the first insulating layer 33 and damaging the first current collector 31, thereby ensuring that the first insulating layer 33 protects the first blank area A3 and its end surface M4. Furthermore, the maximum distance H2 between the second surface M2 and the first current collector 31 is set to no more than 20 μm to reduce the adverse effects of the excessive thickness of the first insulating layer 33 on the overall size and weight of the first pole piece 30. This helps reduce the impact of the first insulating layer 33 on the capacity of the battery cell 500 and improve the performance of the battery cell 500.

[0163] In some embodiments, the material in the first insulating layer 33 and the material in the first active material layer 32 are immiscible with each other.

[0164] Although the first insulating layer 33 does not cover the surface of the first active material layer 32 facing away from the first current collector 31, the first insulating layer 33 may contact the side surface of the first active material layer 32. On this basis, if the material in the first insulating layer 33 can dissolve into the first active material layer 32, the first active material layer 32 will be doped with the insulating material, affecting the performance of the first active material layer 32.

[0165] In view of this, the embodiment of the present application restricts the materials in the first insulating layer 33 so that the materials in the first insulating layer 33 and the materials in the first active material layer 32 are immiscible with each other. In this way, even if the first insulating layer 33 and the first active material layer 32 come into contact, the materials in the first insulating layer 33 will not penetrate into the first active material layer 32, thereby improving the performance reliability of the first active material layer 32.

[0166] In some embodiments, the material of the first insulating layer 33 includes at least one of polyethylene terephthalate (PET), polypropylene (PP), polytetrafluoroethylene (PTFE), polyethylene (PE), and polyvinylidene difluoride (PVDF).

[0167] In the embodiment of the present application, by configuring the material of the first insulating layer 33 to include at least one of polyethylene terephthalate, polypropylene, polytetrafluoroethylene, polyethylene, and polyvinylidene fluoride, the first insulating layer 33 not only provides insulation protection but also is immiscible with the first active material layer 32, thereby improving the performance and reliability of the battery cell 500. Furthermore, the aforementioned materials can be used to form a tape structure, which is then attached to the first blank area A3, thereby simplifying the installation process corresponding to the first insulating layer 33.

[0168] In some embodiments, as Figure 6 and Figure 8 As shown, the first blank area A3 is located on one side of the coating area along the first direction X. The size of the first blank area A3 in the first direction X is L1, and L1 satisfies: 1mm≤L1<10mm. Optionally, L1 is one of 1mm, 2mm, 5mm, 7mm and 9mm.

[0169] In the embodiment of the present application, by setting the dimension L1 of the first blank area A3 in the first direction X to be no less than 1 mm, the first blank area A3 can have a certain size in the first direction X, thereby ensuring that the first insulating layer 33 is attached and fixed to the first blank area A3, thereby improving the reliability of the position of the first insulating layer 33 relative to the first blank area A3. Furthermore, by setting the dimension L1 of the first blank area A3 in the first direction X to be less than 10 mm, the effect of the presence of the first blank area A3 on the overall size of the first current collector 31 in the first direction X is reduced, and the size of the first insulating layer 33 in the first direction X is also reduced. This reduces the effect of the presence of the first blank area A3 and the first insulating layer 33 on the overall capacity of the battery cell 500, thus providing strong practicality.

[0170] In some embodiments, the first blank area A3 is located on one side of the first coating area A1 along the first direction X. The first insulating layer 33 has a dimension L2 in the first direction X, where L2 satisfies: 1 mm < L2 ≤ 10 mm. Optionally, L1 is one of 2 mm, 4 mm, 5 mm, 7 mm, and 10 mm.

[0171] In the embodiment of the present application, the dimension L2 of the first insulating layer 33 in the first direction X is set to be greater than 1 mm, thereby ensuring that the minimum dimension of the first insulating layer 33 exceeds the minimum dimension of the first blank area A3. This ensures that the first insulating layer 33 covers and protects the end surface M4, reduces the risk of a short circuit between the first electrode sheet 30 and the second electrode sheet 40, and improves the reliability of the battery cell 500. Furthermore, the dimension L2 of the first insulating layer 33 in the first direction X is set to be no greater than 10 mm, thereby reducing the impact of the first insulating layer 33 on the overall capacity of the battery cell 500 and improving the performance of the battery cell 500.

[0172] In some embodiments, the first insulating layer 33 extends beyond the first blank area A3 by a dimension L3 in the first direction X, and L3 satisfies: 0.1 mm≤L3≤5 mm. Optionally, L3 is one of 0.1 mm, 0.5 mm, 1 mm, 3 mm, and 5 mm.

[0173] In the embodiment of the present application, the dimension of the first insulating layer 33 that extends beyond the first blank area A3 is the dimension of the connecting portion 333 in the first direction X. By setting the dimension L3 of the first insulating layer 33 that extends beyond the first blank area A3 in the first direction X to be no less than 0.1 mm, the connecting portion 333 has a certain dimension in the first direction X to cover and protect the end surface M4, thereby reducing the risk of burrs penetrating the connecting portion 333 and damaging the end surface M4. Furthermore, the dimension L3 of the first insulating layer 33 that extends beyond the first blank area A3 in the first direction X is set to no more than 5 mm, thereby reducing the impact of the first insulating layer 33 on the overall capacity of the battery cell 500 and improving the performance of the battery cell 500.

[0174] In some embodiments, see Figures 9 to 11 The first current collector 31 further includes a second blank area A4 located between the first coating area A1 and the first tab area A2 . The battery cell 500 further includes a second insulating layer 34 . The second insulating layer 34 is at least partially disposed in the second blank area A4 .

[0175] In addition to being easily short-circuited due to burrs on the second pole piece 40 on the side of the first coating area A1 away from the first pole lug area A2, the first pole piece 30 is also easily short-circuited on the side close to the first pole lug area A2. In view of this, the embodiment of the present application adds a second insulating layer 34 in the second blank area A4, and uses the second insulating layer 34 to reduce the risk of short circuit caused by contact with burrs in the second blank area A4. Specifically, the second blank area A4 is an area located between the first coating area A1 and the first pole lug area A2, and is not used to act as a pole lug. In conjunction with the accompanying drawings, the first pole lug area A2 is arranged to protrude from the second blank area A4 along the first direction X, and multiple first pole lug areas A2 are arranged at intervals in the second direction Y.

[0176] On this basis, the side portions of the second blank area A4 that are not connected to the first tab area A2 are susceptible to short circuits due to burrs on the second pole piece 40, affecting the reliability of the battery cell 500. However, in the embodiment of the present application, the presence of the second insulating layer 34 can provide a protective covering for the surface and side surfaces of the second blank area A4, thereby reducing the risk of short circuits between the first pole piece 30 and the second pole piece 40 in the second blank area A4 and improving the reliability of the battery cell 500.

[0177] It should be noted that, along the thickness direction Z of the first electrode 30, the second insulating layer 34 can be provided only on one side of the first current collector 31, or on both sides. Furthermore, the corresponding projection of the second insulating layer 34 can overlap or not overlap with the projection of the first active material layer 32. That is, the second insulating layer 34 can be partially located on the side of the first active material layer 32 facing away from the first current collector 31, or it can be completely not located on the side of the first active material layer 32 facing away from the first current collector 31. Furthermore, optionally, the dimension of the second blank area A4 in the first direction X is L4, that is, the dimension of the second insulating layer 34 extending beyond the first active material layer 32 in the second direction Y is L4, and L4 satisfies the following: 0.1 mm ≤ L4 ≤ 5 mm. Optionally, L4 is one of 0.1 mm, 0.5 mm, 1 mm, 3 mm, and 5 mm.

[0178] In addition, the material and formation method of the second insulating layer 34 may be consistent with or different from those of the first insulating layer 33. Optionally, the material and formation method of the first insulating layer 33 and the second insulating layer 34 are consistent.

[0179] In some embodiments, as Figure 9 and Figure 10 As shown, the first active material layer 32 includes a first surface M1 facing away from the first current collector 31, and the second insulating layer 34 has a third surface M3 facing away from the first current collector 31. In the thickness direction Z of the first electrode 30, the maximum distance H1 between the first surface M1 and the first current collector 31 is greater than or equal to the maximum distance H3 between the third surface M3 and the first current collector 31.

[0180] The third surface M3 is the surface of the second insulating layer 34 facing away from the first current collector 31. The maximum distance H2 between the third surface M3 and the first current collector 31 is the maximum thickness of the second insulating layer 34 on the side of the first current collector 31. The third surface M3 can be a flat surface or an inclined surface.

[0181] In the embodiment of the present application, the maximum distance H1 between the first surface M1 and the first current collector 31 is not less than the maximum distance H3 between the third surface M3 and the first current collector 31, that is, in the thickness direction Z of the first electrode sheet 30, the second insulating layer 34 will not exceed the first active material layer 32. This can reduce the impact of the existence of the second insulating layer 34 on the overall thickness of the first electrode sheet 30, thereby helping to reduce the impact of the second insulating layer 34 on the capacity of the battery cell 500 and improve the performance of the battery cell 500.

[0182] In some embodiments, the first active material layer 32 includes a central portion 321 and a first edge portion 322 located on a side of the central portion 321 close to the second blank area A4. The central portion 321 is thicker than the first edge portion 322. The second insulating layer 34 is partially located on a side of the first edge portion 322 facing away from the first current collector 31.

[0183] Due to factors such as the preparation process, the thickness of the first active material layer 32 is different in the center portion 321 and the first edge portion 322. The thickness of the center portion 321 mentioned here refers to the average thickness of the center portion 321. Similarly, the thickness of the first edge portion 322 refers to the average thickness of the first edge portion 322. The thickness of the first edge portion 322 gradually decreases in the direction away from the center portion 321, that is, in the direction toward the second blank area A4.

[0184] In the embodiment of the present application, the second insulating layer 34 may be partially disposed in the second blank area A4 and partially disposed on the side of the first edge portion 322 facing away from the first current collector 31. Furthermore, because the thickness of the first edge portion 322 is less than the thickness of the center portion 321, the portion of the second insulating layer 34 located on the side of the first edge portion 322 facing away from the first current collector 31 will not extend beyond the surface of the center portion 321 facing away from the first current collector 31. This design does not adversely affect the overall thickness of the first electrode sheet 30, and at the same time helps to increase the size of the second insulating layer 34 in the first direction X, thereby improving the corresponding coverage and protection effect of the second insulating layer 34, thereby improving the reliability of the battery cell 500.

[0185] In some optional embodiments, such as Figure 9 and Figure 10As shown, the portion of the second insulating layer 34 located on the side of the first edge portion 322 facing away from the first current collector 31 has a dimension L4 in the first direction X, where L4 satisfies the following: 0.1 mm ≤ L4 ≤ 5 mm. Optionally, L4 is one of 0.1 mm, 0.5 mm, 1 mm, 3 mm, and 5 mm. This can improve the coverage and protection of the second insulating layer 34, reduce the risk of partial exposure of the structure in the second blank area A4, and improve the reliability of the battery cell 500. It can also reduce the loss of battery cell 500 capacity caused by the presence of the second insulating layer 34, thereby improving the performance of the battery cell 500.

[0186] In some embodiments, the first electrode 30 is a positive electrode, and the second electrode 40 is a negative electrode.

[0187] In the embodiment of the present application, a first insulating layer 33 is added to the positive electrode sheet to provide a protective covering for the end surface M4, thereby reducing the risk of the end surface M4 being punctured by burrs on the negative electrode sheet, thereby increasing the reliability of the battery cell 500. Furthermore, a second insulating layer 34 can be added to the positive electrode sheet to provide a protective covering for the side of the second blank area A4 away from the first coating area A1, thereby further reducing the risk of a short circuit and increasing the reliability of the battery cell 500.

[0188] In some embodiments, as Figure 9 As shown, the second pole piece 40 includes a second current collector 41 and a second active material layer 42. The second current collector 41 includes a second coating area A5 and a second tab area A6. The second active material layer 42 is disposed in the second coating area A5. In the thickness direction Z of the first pole piece 30, the projection of the first insulating layer 33 overlaps the interface M5 between the second coating area A5 and the second tab area A6.

[0189] The second current collector 41 includes a second coating area A5 and a second tab area A6. The second coating area A5 is an area on the second current collector 41 for disposing the second active material layer 42. The second active material layer 42 can be disposed on one side or both sides of the second current collector 41 along the thickness direction Z. The second tab area A6 is an area for forming the tab corresponding to the second pole piece 40, and the second active material layer 42 is not disposed on the second tab area A6. The second tab area A6 is adjacent to the second coating area A5, and the interface M5 between the second tab area A6 and the second coating area A5 is the cutting surface corresponding to the second pole piece 40. At this position, the second pole piece 40 is prone to burrs and short circuits with the first pole piece 30.

[0190] In the embodiment of the present application, in the thickness direction Z of the first pole piece 30, the projection of the first insulating layer 33 is overlapped with the interface M5 between the second coating area A5 and the second pole tab area A6, so that the first insulating layer 33 can block the burrs generated by the second pole piece 40 at the interface M5, thereby reducing the risk of short circuit between the first pole piece 30 and the second pole piece 40 and improving the reliability of the battery cell 500.

[0191] In some embodiments, there are multiple first pole pieces 30 and multiple second pole pieces 40 , and the multiple first pole pieces 30 and the multiple second pole pieces 40 are alternately stacked.

[0192] The electrode assembly 20 is a laminated structure. In related technologies, the coating area in one electrode piece in the laminated electrode assembly is on the surface away from the ear area, which is more easily punctured by burrs on the other electrode piece, thereby easily causing a short circuit problem between the two electrode pieces.

[0193] In view of this, in the embodiment of the present application, a first insulating layer 33 comprising an insulating material is added to the first pole piece 30, and the first insulating layer 33 is directed along the direction of the first coating area A1 toward the first blank area A3. The first insulating layer 33 can extend beyond the first blank area A3 and away from the end surface M4 of the first coating area A1, thereby covering and protecting the end surface M4, thereby reducing the risk of the end surface M4 being punctured by burrs on the second pole piece 40 and causing a short circuit problem, thereby improving the reliability of the battery cell 500.

[0194] In a second aspect, an embodiment of the present application provides a battery device, which includes the battery cell 500 in any of the aforementioned embodiments.

[0195] It should be noted that the battery device provided in the embodiment of the present application has the beneficial effects of the battery cell 500 in any of the aforementioned embodiments. Please refer to the aforementioned description of the beneficial effects of the battery cell 500 for details, and the embodiment of the present application will not be repeated.

[0196] In a third aspect, an embodiment of the present application provides an electrical device, which includes a battery cell 500 in any of the aforementioned embodiments, a battery device in any of the aforementioned embodiments, and a cylindrical battery cell 500 or a battery device for providing electrical energy.

[0197] It should be noted that the electrical device provided in the embodiment of the present application has the beneficial effects of the battery cell 500 in any of the aforementioned embodiments. Please refer to the aforementioned description of the beneficial effects of the battery cell 500 for details, and the embodiment of the present application will not be repeated.

[0198] According to some embodiments of this application, please refer to Figures 9 to 11The battery cell 500 includes an electrode assembly 20 housed within a housing 10. The electrode assembly 20 includes a first electrode sheet 30 and a second electrode sheet 40 of opposite polarity. The first electrode sheet 30 is a positive electrode sheet, and the second electrode sheet 40 is a negative electrode sheet. The first electrode sheet 30 includes a first current collector 31, a first active material layer 32, a first insulating layer 33, and a second insulating layer 34. The first current collector 31 includes a first coating area A1, a first blank area A3, a second blank area A4, and a first tab area A2. The first blank area A3, the second blank area A4, and the first tab area A2 are not provided with the first active material layer 32. The first tab area A2 and the first blank area A3 are located on either side of the first coating area A1, and the second blank area A4 is located between the first tab area A2 and the first coating area A1.

[0199] The first insulating layer 33 is disposed in the first blank area A3. The first insulating layer 33 includes a first sublayer 331 and a second sublayer 332, which are disposed on either side of the first current collector 31 in the thickness direction Z of the first electrode 30, and a connecting portion 333 connecting the first sublayer 331 and the second sublayer 332. The connecting portion 333 is disposed over the end surface M4. The first insulating layer 333 includes two independently formed insulating members 334. One insulating member 334 includes a first sublayer 331 and a first connecting portion 335, and the other insulating member 334 includes a second sublayer 332 and a second connecting portion 336. The first connecting portion 335 and the second connecting portion 336 are stacked to form the connecting portion 333.

[0200] The first active material layer 32 includes a first surface M1 facing away from the first current collector 31, and the first insulating layer 33 includes a second surface M2 facing away from the first current collector 31. In the thickness direction Z of the first electrode 30, the maximum distance between the first surface M1 and the first current collector 31 is greater than or equal to the maximum distance between the second surface M2 and the first current collector 31. The materials in the first insulating layer 33 and the first active material layer 32 are immiscible with each other.

[0201] The second insulating layer 34 is at least partially disposed within the second blank area A4. The first active material layer 32 includes a central portion 321 and a first edge portion 322 located on the side of the central portion 321 closer to the second blank area A4. The central portion 321 is thicker than the first edge portion 322. The second insulating layer 34 is partially located on the side of the first edge portion 322 facing away from the first current collector 31. The first active material layer 32 includes a first surface M1 facing away from the first current collector 31. The second insulating layer 34 has a third surface M3 facing away from the first current collector 31. In the thickness direction Z of the first electrode sheet 30, the maximum distance between the first surface M1 and the first current collector 31 is greater than or equal to the maximum distance between the third surface M3 and the first current collector 31.

[0202] The second pole piece 40 includes a second current collector 41 and a second active material layer 42. The second current collector 41 includes a second coating area A5 and a second tab area A6. The second active material layer 42 is arranged in the second coating area A5. In the thickness direction Z of the first pole piece 30, the projection of the first insulating layer 33 overlaps with the interface M5 between the second coating area A5 and the second tab area A6.

[0203] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: An electrode assembly is contained in a housing, wherein the electrode assembly includes a first electrode piece and a second electrode piece having opposite polarities; The first electrode sheet includes a first current collector, a first active material layer, and a first insulating layer. The first current collector includes a first coating area, a first blank area, and a first tab area. The first active material layer is provided in the first coating area. The first blank area and the first tab area are not provided with the first active material layer. The first tab area and the first blank area are provided on both sides of the first coating area. The first insulating layer is disposed in the first blank area, along a direction from the first coating area to the first blank area, and the first insulating layer extends beyond the first blank area and away from an end surface of the first coating area.

2. The battery cell according to claim 1, wherein: In the thickness direction of the first pole piece, the projection of the first insulating layer is located outside the projection of the first active material layer.

3. The battery cell according to claim 1, wherein: The first insulating layer includes a first sublayer and a second sublayer respectively arranged on both sides of the first current collector in the thickness direction of the first pole piece, and a connecting portion connecting the first sublayer and the second sublayer, wherein the connecting portion covers the end surface.

4. The battery cell according to claim 3, characterized in that The first insulating layer includes two independently formed insulating parts, one of which includes the first sublayer and a first connecting portion, and the other includes the second sublayer and a second connecting portion, and the first connecting portion and the second connecting portion are stacked to form the connecting portion.

5. The battery cell according to claim 1, characterized in that The first active material layer includes a first surface facing away from the first current collector, and the first insulating layer has a second surface facing away from the first current collector; In the thickness direction of the first pole piece, the maximum distance between the first surface and the first current collector is greater than or equal to the maximum distance between the second surface and the first current collector.

6. The battery cell according to claim 5, characterized in that In the thickness direction of the first pole piece, the maximum distance between the second surface and the first current collector is H2, and H2 satisfies: 3 μm≤H2≤20 μm.

7. The battery cell according to claim 1, characterized in that The material in the first insulating layer and the material in the first active material layer are immiscible with each other.

8. The battery cell according to claim 1, wherein: The material of the first insulating layer includes at least one of polyethylene terephthalate, polypropylene, polytetrafluoroethylene, polyethylene, and polyvinylidene fluoride.

9. The battery cell according to claim 1, characterized in that The first blank area is located at one side of the coating area along a first direction. The size of the first blank area in the first direction is L1, and L1 satisfies: 1 mm ≤ L1 ≤ 10 mm.

10. The battery cell according to claim 1, characterized in that The first blank area is located at one side of the first coating area along the first direction. The size of the first insulating layer in the first direction is L2, and L2 satisfies: 1 mm < L2 ≤ 10 mm.

11. The battery cell according to claim 1, characterized in that The first blank area is located at one side of the first coating area along the first direction. The first insulating layer extends beyond the first blank area by a dimension L3 in the first direction, and L3 satisfies the following: 0.1 mm ≤ L3 ≤ 5 mm.

12. The battery cell according to claim 1, wherein The first current collector further includes a second blank area between the first coating area and the first tab area. The battery cell further includes a second insulating layer, and the second insulating layer is at least partially disposed in the second blank area.

13. The battery cell according to claim 12, characterized in that: The first active material layer includes a first surface facing away from the first current collector, and the second insulating layer has a third surface facing away from the first current collector; In the thickness direction of the first pole piece, the maximum distance between the first surface and the first current collector is greater than or equal to the maximum distance between the third surface and the first current collector.

14. The battery cell according to claim 13, characterized in that The first active material layer includes a central portion and a first edge portion located on a side of the central portion close to the second blank area, and the central portion is thicker than the first edge portion; The second insulating layer is partially located on a side of the first edge portion away from the first current collector.

15. The battery cell according to claim 1, characterized in that The first pole piece is a positive pole piece, and the second pole piece is a negative pole piece.

16. The battery cell according to claim 1, characterized in that The second pole piece includes a second current collector and a second active material layer, the second current collector includes a second coating area and a second tab area, and the second active material layer is provided in the second coating area; In the thickness direction of the first pole piece, the projection of the first insulating layer overlaps with the interface between the second coating area and the second pole tab area.

17. The battery cell according to claim 1, characterized in that There are multiple first pole pieces and multiple second pole pieces, and the multiple first pole pieces and the multiple second pole pieces are alternately stacked.

18. A battery device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 17.

19. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 17.

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