Battery cell, electrode assembly and manufacturing method therefor, battery device, and electric device

Abstract

Provided are a battery cell, an electrode assembly and a manufacturing method therefor, a battery device, and an electric device. The battery cell comprises an electrode assembly, and the electrode assembly comprises a solid-state electrolyte layer, and a first electrode sheet and a second electrode sheet having opposite polarities. The first electrode sheet comprises a first current collecting layer, a first active material layer, and a first insulating layer, in a first direction, at least one side of the first current collecting layer is provided with the first active material layer and the first insulating layer, and in a second direction, both ends of the first active material layer are provided with the first insulating layers. The second electrode sheet comprises a second current collecting layer, a second active material layer, and a second insulating layer, in the first direction, at least one side of the second current collecting layer is provided with the second active material layer and the second insulating layer, and in a third direction, both ends of the second active material layer are provided with the second insulating layers. The solid-state electrolyte layer is arranged between the first electrode sheet and the second electrode sheet in the first direction. The first direction, the second direction, and the third direction intersect in pairs. The battery cell has high reliability.

Description

Battery cells, electrode assemblies and their manufacturing methods, battery devices and electrical devices Cross-reference to related applications

[0001] This application claims priority to Chinese patent application No. 202411433424.7, filed on October 14, 2024, entitled “Battery cell, electrode assembly and method of manufacturing thereof, battery device and power device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of batteries, and more specifically, to a battery cell, electrode assembly and manufacturing method thereof, battery device and power-consuming device. Background Technology

[0003] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, battery reliability must also be considered. However, current battery reliability is relatively poor. Summary of the Invention

[0004] The purpose of this application is to provide a battery cell, electrode assembly and its manufacturing method, battery device and power device, which aim to improve the problem of poor battery reliability in related technologies.

[0005] In a first aspect, embodiments of this application provide a battery cell, the battery cell including an electrode assembly, the electrode assembly including a first electrode, a second electrode, and a solid electrolyte layer, the first electrode including a first current collector layer, a first active material layer, and a first insulating layer, the first active material layer and the first insulating layer being disposed on at least one side of the first current collector layer along a first direction, and the first insulating layer being disposed at both ends of the first active material layer along a second direction; the second electrode has the opposite polarity to the first electrode, the second electrode including a second current collector layer, a second active material layer, and a second insulating layer, the second active material layer and the second insulating layer being disposed on at least one side of the second current collector layer along the first direction, and the second insulating layer being disposed at both ends of the second active material layer along a third direction; the solid electrolyte layer is disposed between the first electrode and the second electrode along the first direction, the first direction, the second direction, and the third direction intersect each other.

[0006] In the above technical solution, along the second direction, a first active material layer is disposed between two first insulating layers, and along the third direction, a second active material layer is disposed between two second insulating layers. During the manufacturing of the electrode assembly, a first electrode sheet, a solid electrolyte layer, and a second electrode sheet need to be extruded along the first direction. The two first insulating layers restrict the first active material layer in the second direction, making it difficult for the active material of the first active material layer to be extruded along one end of the second direction. When the active material of the first active material layer is extruded along one end of the third direction, the second insulating layers can provide insulation, thereby reducing the risk of short circuits caused by the overlap of the active materials of the first and second active material layers. Similarly, the two second insulating layers restrict the second active material layer in the third direction, making it difficult for the active material of the second active material layer to be extruded along one end of the third direction. When the active material of the second active material layer is extruded along one end of the second direction, the first insulating layers can provide insulation, thereby reducing the risk of short circuits caused by the overlap of the active materials of the first and second active material layers, which is beneficial to improving the reliability of the battery cell.

[0007] As an optional technical solution in this application embodiment, in a projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers located at both ends of the first active material layer are connected end to end with the orthographic projections of the two second insulating layers located at both ends of the second active material layer to form a ring.

[0008] In the above technical solution, by making the orthographic projections of the two first insulating layers on a projection plane perpendicular to the first direction and the orthographic projections of the two second insulating layers on a projection plane perpendicular to the first direction form a ring, the first insulating layer and the second insulating layer cooperate to achieve a better insulation effect, further reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer and the second active material layer, which is more conducive to improving the reliability of the battery cell.

[0009] As an optional technical solution in this application embodiment, the first electrode further includes a first electrode tab, which is connected to one end of the first current collector layer along the second direction; and / or the second electrode further includes a second electrode tab, which is connected to one end of the second current collector layer along the third direction.

[0010] In the above technical solution, two first insulating layers are disposed at both ends of the first active material layer along the second direction, and the first tab is connected to one end of the first current collector layer along the second direction. That is, the arrangement direction of the two first insulating layers is the same as the arrangement direction of the first tab and the first current collector layer. In this way, it is convenient to manufacture the first electrode sheet by continuous coating during manufacturing, which helps to reduce manufacturing costs. Similarly, two second insulating layers are disposed at both ends of the second active material layer along the third direction, and the second tab is connected to one end of the second current collector layer along the third direction. That is, the arrangement direction of the two second insulating layers is the same as the arrangement direction of the second tab and the second current collector layer. In this way, it is convenient to manufacture the second electrode sheet by continuous coating during manufacturing, which helps to reduce manufacturing costs.

[0011] As an optional technical solution in this application embodiment, along the first direction, the first active material layer and the first insulating layer are provided on both sides of the first current collector layer; and / or along the first direction, the second active material layer and the second insulating layer are provided on both sides of the second current collector layer.

[0012] In the above technical solution, by providing a first active material layer on both sides of the first current collector along the first direction, the energy density of the battery cell is improved. Correspondingly, by providing a first insulating layer on both sides of the first current collector along the first direction, the risk of short circuit caused by the overlap of the active materials of the first and second active material layers is reduced, which is beneficial to improving the reliability of the battery cell. Similarly, by providing a second active material layer on both sides of the second current collector along the first direction, the energy density of the battery cell is improved. Correspondingly, by providing a second insulating layer on both sides of the second current collector along the first direction, the risk of short circuit caused by the overlap of the active materials of the first and second active material layers is reduced, which is beneficial to improving the reliability of the battery cell.

[0013] As an optional technical solution in this application embodiment, along the third direction, the length of the first insulating layer is L1, and the minimum distance between the two second insulating layers is L2, satisfying: L1≥L2; and / or along the second direction, the length of the second insulating layer is L3, and the minimum distance between the two first insulating layers is L4, satisfying: L3≥L4.

[0014] In the above technical solution, when L1 = L2 and L3 = L4, in the projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers located at both ends of the first active material layer and the two second insulating layers located at both ends of the second active material layer form a ring, and the orthographic projections of the first and second insulating layers do not overlap. When L1 > L2 and L3 > L4, in the projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers located at both ends of the first active material layer and the two second insulating layers located at both ends of the second active material layer form a ring, and the orthographic projections of the first and second insulating layers overlap. Therefore, when L1 ≥ L2 and L3 ≥ L4, the first and second insulating layers can work together to achieve better insulation, further reducing the risk of short circuits caused by the overlap of the active materials in the first and second active material layers, and thus improving the reliability of the battery cell.

[0015] As an optional technical solution in this application embodiment, in a projection plane perpendicular to the first direction, the orthographic projection of the first insulating layer and the orthographic projection of the second insulating layer partially overlap.

[0016] In the above technical solution, when the orthographic projection of the first insulating layer on the projection plane perpendicular to the first direction and the orthographic projection of the second insulating layer on the projection plane perpendicular to the first direction partially overlap, the first insulating layer and the second insulating layer can work together to achieve a better insulation effect, further reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer and the second active material layer, which is more conducive to improving the reliability of the battery cell.

[0017] As an optional technical solution in this application embodiment, the thickness of the first insulating layer is less than the thickness of the first active material layer; and / or the thickness of the second insulating layer is less than the thickness of the second active material layer.

[0018] In the above technical solution, by making the thickness of the first insulating layer smaller than the thickness of the first active material layer and / or the thickness of the second insulating layer smaller than the thickness of the second active material layer, it is beneficial to reduce the risk of interference between the first and second insulating layers during manufacturing. Furthermore, the smaller volume occupied by the first and second insulating layers is beneficial to improving the energy density of the battery cell.

[0019] As an optional technical solution in this application embodiment, the thickness of the first insulating layer is H1, which satisfies: 2μm≤H1≤50μm; and / or the thickness of the second insulating layer is H2, which satisfies: 2μm≤H2≤50μm.

[0020] In the above technical solution, when H1 ≥ 2 μm, the thickness of the first insulating layer is relatively large, which can better confine the first active material layer and reduce the risk of the active material in the first active material layer being extruded along one end of the second direction. When H1 ≤ 50 μm, the thickness of the first insulating layer is not too large, which can reduce the risk of interference with other components during manufacturing and facilitate manufacturing. Therefore, when 2 μm ≤ H1 ≤ 50 μm, it can both reduce the risk of the active material in the first active material layer being extruded along one end of the second direction and facilitate manufacturing.

[0021] When H2 ≥ 2 μm, the thickness of the second insulating layer is relatively large, which can effectively confine the second active material layer and reduce the risk of the active material in the second active material layer being extruded along the third direction. When H2 ≤ 50 μm, the thickness of the second insulating layer is not too large, which can reduce the risk of interference with other components during manufacturing and facilitate manufacturing. Therefore, when 2 μm ≤ H2 ≤ 50 μm, it can both reduce the risk of the active material in the second active material layer being extruded along the third direction and facilitate manufacturing.

[0022] As an optional technical solution in this application embodiment, the first insulating layer includes boehmite or insulating adhesive; and / or the second insulating layer includes boehmite or insulating adhesive.

[0023] In the above technical solutions, boehmite and insulating adhesive have good insulation properties and low cost, which helps to improve the reliability of battery cells and reduce manufacturing costs.

[0024] As an optional technical solution in this application embodiment, the electrode assembly includes an insulating member, which is disposed around the solid electrolyte layer and abuts against the first insulating layer and the second insulating layer respectively along the first direction.

[0025] In the above technical solution, the insulating component is disposed around the solid electrolyte layer and abuts against the first insulating layer and the second insulating layer respectively along the first direction. In this way, the insulating component can surround the outside of at least one of the first active material layer and the second active material layer, thereby restricting the active material of the first active material layer and the second active material layer from being squeezed out, reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer and the second active material layer, which is beneficial to improving the reliability of the battery cell.

[0026] As an optional technical solution in this application embodiment, the thickness of the first active material layer is H3, satisfying: 10μm≤H3≤200μm; and / or the thickness of the second active material layer is H4, satisfying: 10μm≤H4≤200μm.

[0027] In the above technical solution, when 10μm≤H3≤200μm, the thickness of the first active material layer is moderate, which is beneficial to improving the energy density of the battery cell and is also easy to manufacture.

[0028] When 10μm≤H4≤200μm, the thickness of the second active material layer is moderate, which is beneficial to improving the energy density of the battery cell and is also easy to manufacture.

[0029] Secondly, embodiments of this application also provide an electrode assembly, the electrode assembly including a first electrode, a second electrode, and a solid electrolyte layer. The first electrode includes a first current collector layer, a first active material layer, and a first insulating layer. Along a first direction, at least one side of the first current collector layer is provided with the first active material layer and the first insulating layer. Along a second direction, both ends of the first active material layer are provided with the first insulating layer. The second electrode has the opposite polarity to the first electrode. The second electrode includes a second current collector layer, a second active material layer, and a second insulating layer. Along the first direction, at least one side of the second current collector layer is provided with the second active material layer and the second insulating layer. Along a third direction, both ends of the second active material layer are provided with the second insulating layer. The solid electrolyte layer is disposed between the first electrode and the second electrode along the first direction. The first direction, the second direction, and the third direction are not coplanar and intersect each other.

[0030] As an optional technical solution in this application embodiment, in a projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers located at both ends of the first active material layer and the orthographic projections of the two second insulating layers located at both ends of the second active material layer form a ring.

[0031] In the above technical solution, by making the orthographic projection of the first insulating layer on the projection plane perpendicular to the first direction and the orthographic projection of the second insulating layer on the projection plane perpendicular to the first direction form a ring, the first insulating layer and the second insulating layer cooperate to achieve a better insulation effect, further reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer and the second active material layer, which is more conducive to improving the reliability of the battery cell.

[0032] As an optional technical solution in this application embodiment, the first electrode further includes a first electrode tab, which is connected to one end of the first current collector layer along the second direction; and / or the second electrode further includes a second electrode tab, which is connected to one end of the second current collector layer along the third direction.

[0033] In the above technical solution, two first insulating layers are disposed at both ends of the first active material layer along the second direction, and the first tab is connected to one end of the first current collector layer along the second direction. That is, the arrangement direction of the two first insulating layers is the same as the arrangement direction of the first tab and the first current collector layer. In this way, it is convenient to manufacture the first electrode sheet by continuous coating during manufacturing, which helps to reduce manufacturing costs. Similarly, two second insulating layers are disposed at both ends of the second active material layer along the third direction, and the second tab is connected to one end of the second current collector layer along the third direction. That is, the arrangement direction of the two second insulating layers is the same as the arrangement direction of the second tab and the second current collector layer. In this way, it is convenient to manufacture the second electrode sheet by continuous coating during manufacturing, which helps to reduce manufacturing costs.

[0034] Thirdly, embodiments of this application also provide an electrode assembly manufacturing method, the electrode assembly manufacturing method comprising: providing a first electrode sheet, the first electrode sheet comprising a first current collector layer, a first active material layer and a first insulating layer, wherein the first active material layer and the first insulating layer are disposed on at least one side of the first current collector layer along a first direction, and the first insulating layer is disposed at both ends of the first active material layer along a second direction; providing a second electrode sheet, the second electrode sheet having the opposite polarity to the first electrode sheet, the second electrode sheet comprising a second current collector layer, a second active material layer and a second insulating layer, wherein the second active material layer and the second insulating layer are disposed on at least one side of the second current collector layer along the first direction, and the second insulating layer is disposed at both ends of the second active material layer along a third direction; providing a solid electrolyte layer; and stacking the first electrode sheet, the solid electrolyte layer and the second electrode sheet along the first direction, wherein the solid electrolyte layer is disposed between the first electrode sheet and the second electrode sheet along the first direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0035] As an optional technical solution in this application embodiment, providing the first electrode includes: providing a first substrate; coating the first substrate with a first active material slurry along the extension direction of the first substrate to form a corresponding first active material layer; coating the first substrate with a first insulating slurry along the extension direction of the first substrate to form a corresponding first insulating layer; and cutting the first substrate having the first insulating layer and the first active material layer formed thereon to form the first electrode.

[0036] In the above technical solution, the first electrode is manufactured by continuous coating, which helps to reduce manufacturing costs.

[0037] As an optional technical solution in this application embodiment, providing the second electrode includes: providing a second substrate; coating a second active material slurry on the second substrate along the extension direction of the second substrate to form a corresponding second active material layer; coating a second insulating slurry on the second substrate along the extension direction of the second substrate to form a corresponding second insulating layer; and cutting the second substrate having the second insulating layer and the second active material layer formed thereon to form the second electrode.

[0038] In the above technical solution, the second electrode is manufactured by continuous coating, which helps to reduce manufacturing costs.

[0039] Fourthly, embodiments of this application also provide a battery device, the battery device comprising the aforementioned battery cell.

[0040] Fifthly, embodiments of this application also provide an electrical device, the electrical device including the aforementioned battery cell, the battery cell being used to provide electrical energy to the electrical device. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0043] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0044] Figure 3 is an exploded view of a single battery cell provided in some embodiments of this application;

[0045] Figure 4 is a projection view of the first insulating layer and the second insulating layer along the first direction provided in some embodiments of this application;

[0046] Figure 5 is a front view schematic diagram of an electrode assembly provided in some embodiments of this application;

[0047] Figure 6 is a side view schematic diagram of an electrode assembly provided in some embodiments of this application;

[0048] Figure 7 is a first cross-sectional view of an electrode assembly provided in some other embodiments of this application;

[0049] Figure 8 is a second cross-sectional view of an electrode assembly provided in some other embodiments of this application;

[0050] Figure 9 is a schematic block diagram of an electrode assembly manufacturing method provided in some embodiments of this application;

[0051] Figure 10 is a schematic block diagram of an electrode assembly manufacturing method provided in some other embodiments of this application;

[0052] Figure 11 is a schematic block diagram of an electrode assembly manufacturing method provided in some embodiments of this application.

[0053] Icons: 10-Box; 11-First part; 12-Second part; 20-Battery cell; 21-Casing; 211-Shell; 212-End cap; 22-Electrode assembly; 221-First electrode; 2211-First current collector layer; 2212-First active material layer; 2213-First insulating layer; 2214-First tab; 222-Second electrode; 2221-Second current collector layer; 2222-Second active material layer; 2223-Second insulating layer; 2224-Second tab; 223-Solid electrolyte layer; 224-Insulator; 30-Electrode assembly manufacturing method; 100-Battery device; 200-Controller; 300-Motor; 1000-Vehicle. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0056] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0059] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0060] In this application, "multiple" means two or more (including two).

[0061] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0062] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0063] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0064] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0065] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can 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.).

[0066] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials in battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0067] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0068] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative current collector.

[0069] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0070] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0071] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0072] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0073] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0074] As an example, polymer solid electrolytes can be polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0075] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0076] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0077] In some implementations, the electrode assembly is a stacked structure.

[0078] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0079] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0080] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0081] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0082] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0083] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0084] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0085] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0086] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0087] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0088] As an example, the enclosure may include a first part and a second part. The first and second parts are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting off; it can be sealed or not sealed. The first part may be a top cover or a bottom plate.

[0089] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0090] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0091] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0092] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0093] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. Additionally, battery reliability must also be considered. However, current battery reliability is relatively poor.

[0094] Solid-state batteries are characterized by high energy density, and their use in new energy vehicles will significantly improve their range. During the manufacturing process of solid-state batteries, positive and negative electrode sheets and a solid electrolyte layer need to be extruded and compressed. During this extrusion process, the active materials of the positive and negative electrode sheets may be squeezed out, causing them to overlap and resulting in a short circuit, leading to poor reliability of the individual battery cells.

[0095] Therefore, this application provides a battery cell including an electrode assembly, which includes a first electrode, a second electrode, and a solid electrolyte layer. The first electrode includes a first current collector, a first active material layer, and a first insulating layer. Along a first direction, at least one side of the first current collector has the first active material layer and the first insulating layer. Along a second direction, both ends of the first active material layer have the first insulating layer. The second electrode has the opposite polarity to the first electrode. The second electrode includes a second current collector, a second active material layer, and a second insulating layer. Along the first direction, at least one side of the second current collector has the second active material layer and the second insulating layer. Along a third direction, both ends of the second active material layer have the second insulating layer. The solid electrolyte layer is disposed between the first and second electrodes along the first direction. The first, second, and third directions intersect each other.

[0096] Along the second direction, a first active material layer is disposed between two first insulating layers; along the third direction, a second active material layer is disposed between two second insulating layers. During the manufacturing of the electrode assembly, a first electrode, a solid electrolyte layer, and a second electrode need to be extruded along the first direction. The two first insulating layers restrict the first active material layer in the second direction, making it difficult for the active material of the first active material layer to be extruded along one end of the second direction. When the active material of the first active material layer is extruded along one end of the third direction, the second insulating layers provide insulation, thereby reducing the risk of short circuits caused by the overlap of the active materials of the first and second active material layers. Similarly, the two second insulating layers restrict the second active material layer in the third direction, making it difficult for the active material of the second active material layer to be extruded along one end of the third direction. When the active material of the second active material layer is extruded along one end of the second direction, the first insulating layers provide insulation, thereby reducing the risk of short circuits caused by the overlap of the active materials of the first and second active material layers, which is beneficial to improving the reliability of the battery cell.

[0097] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0098] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0099] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0100] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0101] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0102] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 10 and battery cells 20, with the housing 10 used to house the battery cells 20.

[0103] The housing 10 has an enclosed space inside for accommodating the battery cells 20. The housing 10 can have various structures. In some embodiments, the housing 10 may include a first part 11 and a second part 12, which are interlocked. The first part 11 and the second part 12 can have various shapes, such as cuboids or cylinders. The first part 11 can be a hollow structure open on one side, and the second part 12 can also be a hollow structure open on one side. The open side of the second part 12 interlocks with the open side of the first part 11, thus forming a housing 10 with an enclosed space. Alternatively, the first part 11 can be a hollow structure open on one side, and the second part 12 can be a plate-like structure, with the second part 12 interlocking with the open side of the first part 11, thus forming a housing 10 with an accommodating space.

[0104] In the battery device 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel. Alternatively, multiple battery cells 20 can be first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. Another option is that all battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the whole consisting of all battery cells 20 is housed within the housing 10.

[0105] In some embodiments, the battery device 100 may further include a busbar component, through which multiple battery cells 20 can be electrically connected to each other to achieve series, parallel, or mixed connection of the multiple battery cells 20. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0106] Please refer to Figures 3, 4, 5, and 6. Figure 3 is an exploded view of a battery cell 20 provided in some embodiments of this application. Figure 4 is a projected view of the first insulating layer 2213 and the second insulating layer 2223 provided in some embodiments of this application along a first direction. Figure 5 is a front view of an electrode assembly 22 provided in some embodiments of this application. Figure 6 is a side view of an electrode assembly 22 provided in some embodiments of this application. This application provides a battery cell 20, which includes an electrode assembly 22. The electrode assembly 22 includes a first electrode 221, a second electrode 222, and a solid electrolyte layer 223. The first electrode 221 includes a first current collector 2211, a first active material layer 2212, and a first insulating layer 2213. Along the first direction, at least one side of the first current collector 2211 is provided with the first active material layer 2212 and the first insulating layer 2213. Along the second direction, both ends of the first active material layer 2212 are provided with the first insulating layer 2213. The second electrode 222 has the opposite polarity to the first electrode 221. The second electrode 222 includes a second current collector layer 2221, a second active material layer 2222, and a second insulating layer 2223. Along a first direction, the second active material layer 2222 and the second insulating layer 2223 are disposed on at least one side of the second current collector layer 2221. Along a third direction, the second insulating layer 2223 is disposed at both ends of the second active material layer 2222. A solid electrolyte layer 223 is disposed between the first electrode 221 and the second electrode 222 along the first direction. The first direction, the second direction, and the third direction intersect each other.

[0107] Battery cell 20 refers to the smallest unit that makes up battery device 100.

[0108] In some embodiments, the housing 21 may include a housing 211 and an end cap 212, the housing 211 having an opening and the end cap 212 closing the opening of the housing 211. Here, "closing" refers to covering or closing, and can be either sealed or unsealed.

[0109] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 212 is less prone to deformation under pressure and impact, enabling battery cell 20 to have higher structural strength and improved reliability. The material of end cap 212 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0110] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common mating surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0111] In an embodiment where the housing 211 has an opening at one end, one end cap 212 may be provided. In an embodiment where the housing 211 has openings at opposite ends, two end caps 212 may be provided, with the two end caps 212 respectively closing the two openings of the housing 211. The two end caps 212 and the housing 211 together define the receiving space for accommodating the electrode assembly 22.

[0112] Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur. The casing 211 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by stacking a positive electrode, a solid electrolyte layer 223, and a negative electrode. The portions of the positive and negative electrode with active material constitute the main body of the electrode assembly 22, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the solid electrolyte layer 223.

[0113] One of the first electrode 221 and the second electrode 222 is a positive electrode, and the other is a negative electrode. For example, when the first electrode 221 is a positive electrode, the second electrode 222 is a negative electrode. Or, when the first electrode 221 is a positive electrode, the second electrode 222 is a negative electrode.

[0114] The first direction is the stacking direction of the first electrode 221, the solid electrolyte layer 223, and the second electrode 222. Referring to Figures 4, 5, and 6, the first direction is the Z direction shown in the figures. The second direction can be at an acute angle or a right angle to the first direction. Referring to Figures 4, 5, and 6, the second direction is the X direction shown in the figures; in this case, the second direction is perpendicular to the first direction. The third direction can be at an acute angle or a right angle to the first direction. Referring to Figures 4, 5, and 6, the third direction is the Y direction shown in the figures; in this case, the first direction, the second direction, and the third direction are all perpendicular to each other.

[0115] The first current collector layer 2211 is the portion of the current collector of the first electrode 221 where the first active material layer 2212 and the first insulating layer 2213 are disposed. The portion of the current collector of the first electrode 221 without the first active material layer 2212 and the first insulating layer 2213 constitutes the first tab 2214. The first active material layer 2212 and the first insulating layer 2213 are disposed on the same side of the first current collector layer 2211, and the first current collector layer 2211 is provided with two first insulating layers 2213, which are disposed at both ends of the first active material layer 2212 along a second direction.

[0116] In some embodiments, along the first direction, the first current collector 2211 is provided with a first active material layer 2212 and a first insulating layer 2213 on only one side. In other embodiments, along the first direction, the first active material layer 2212 and the first insulating layer 2213 are provided on both sides of the first current collector 2211.

[0117] The second current collector layer 2221 is the portion of the current collector of the second electrode 222 where the second active material layer 2222 and the second insulating layer 2223 are provided. The portion of the current collector of the second electrode 222 where the second active material layer 2222 and the second insulating layer 2223 are not provided constitutes the second tab 2224. The second active material layer 2222 and the second insulating layer 2223 are provided on the same side of the second current collector layer 2221, and the second current collector layer 2221 is provided with two second insulating layers 2223, which are provided at both ends of the second active material layer 2222 along a third direction.

[0118] In some embodiments, along the first direction, the second current collector 2221 has a second active material layer 2222 and a second insulating layer 2223 disposed on only one side. In other embodiments, along the first direction, the second current collector 2221 has a second active material layer 2222 and a second insulating layer 2223 disposed on both sides.

[0119] The solid electrolyte layer 223 includes a polymer solid electrolyte layer, an inorganic solid electrolyte layer, and a composite solid electrolyte layer.

[0120] As an example, the polymer solid electrolyte layer can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid-lithium salt, cellulose, etc.

[0121] As an example, the inorganic solid electrolyte layer may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver germanium sulfide), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0122] As an example, a composite solid electrolyte layer is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0123] Along the second direction, a first active material layer 2212 is disposed between two first insulating layers 2213; along the third direction, a second active material layer 2222 is disposed between two second insulating layers 2223. During the manufacture of the electrode assembly 22, the first electrode 221, the solid electrolyte layer 223, and the second electrode 222 need to be extruded along the first direction. The two first insulating layers 2213 restrict the first active material layer 2212 in the second direction, making it difficult for the active material of the first active material layer 2212 to be extruded along one end of the second direction. When the active material of the first active material layer 2212 is extruded along one end of the third direction, the second insulating layers 2223 can provide insulation, thereby reducing the risk of short circuits caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222. Similarly, the two second insulating layers 2223 restrict the second active material layer 2222 in the third direction, making it difficult for the active material of the second active material layer 2222 to be extruded along one end of the third direction. When the active material of the second active material layer 2222 is extruded along one end of the second direction, the first insulating layer 2213 can play an insulating role, thereby reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222, which is beneficial to improving the reliability of the battery cell 20.

[0124] Referring to Figures 3, 4, 5, and 6, in some embodiments, in a projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers 2213 located at both ends of the first active material layer 2212 are connected end to end with the orthographic projections of the two second insulating layers 2223 located at both ends of the second active material layer 2222 to form a ring.

[0125] The orthographic projections of the two first insulating layers 2213 onto a projection plane perpendicular to the first direction and the orthographic projections of the two second insulating layers 2223 onto a projection plane perpendicular to the first direction enclose a ring. The ring can be a rectangular ring or a circular ring.

[0126] Please refer to Figure 4. In the embodiment shown in Figure 4, the orthographic projections of the two first insulating layers 2213 onto a projection plane perpendicular to the first direction and the orthographic projections of the two second insulating layers 2223 onto a projection plane perpendicular to the first direction enclose a rectangular ring.

[0127] By forming a ring with the orthographic projections of the two first insulating layers 2213 onto a projection plane perpendicular to the first direction and the orthographic projections of the two second insulating layers 2223 onto a projection plane perpendicular to the first direction, the first insulating layers 2213 and the second insulating layers 2223 work together to achieve better insulation, further reducing the risk of short circuits caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222, which is more conducive to improving the reliability of the battery cell 20.

[0128] Referring to Figures 3, 4, 5, and 6, in some embodiments, the first electrode 221 further includes a first tab 2214, which is connected to one end of the first current collector 2211 along a second direction. And / or the second electrode 222 further includes a second tab 2224, which is connected to one end of the second current collector 2221 along a third direction.

[0129] When the first electrode 221 is the positive electrode, the second electrode 222 is the negative electrode, the first tab 2214 is the positive tab, and the second tab 2224 is the negative tab. When the first electrode 221 is the negative electrode, the second electrode 222 is the positive electrode, the first tab 2214 is the negative tab, and the second tab 2224 is the positive tab.

[0130] Two first insulating layers 2213 are disposed at both ends of the first active material layer 2212 along the second direction, and the first tab 2214 is connected to one end of the first current collector 2211 along the second direction. That is, the arrangement direction of the two first insulating layers 2213 is the same as the arrangement direction of the first tab 2214 and the first current collector 2211.

[0131] Two second insulating layers 2223 are disposed at both ends of the second active material layer 2222 along a third direction, and the second tab 2224 is connected to one end of the second current collector 2221 along a third direction. That is, the arrangement direction of the two second insulating layers 2223 is the same as the arrangement direction of the second tab 2224 and the second current collector 2221.

[0132] The arrangement direction of the two first insulating layers 2213 is the same as that of the first tab 2214 and the first current collector 2211. This facilitates the continuous coating process for manufacturing the first electrode 221, thus reducing manufacturing costs. Similarly, the arrangement direction of the two second insulating layers 2223 is the same as that of the second tab 2224 and the second current collector 2221. This facilitates the continuous coating process for manufacturing the second electrode 222, further reducing manufacturing costs.

[0133] Referring to Figures 3, 4, 5, and 6, in some embodiments, a first active material layer 2212 and a first insulating layer 2213 are provided on both sides of the first current collector 2211 along the first direction. And / or a second active material layer 2222 and a second insulating layer 2223 are provided on both sides of the second current collector 2221 along the first direction.

[0134] The first current collector layer 2211 has a first active material layer 2212 on both sides along the first direction, and each first active material layer 2212 has a first insulating layer 2213 at both ends along the second direction.

[0135] The second current collector layer 2221 is provided with a second active material layer 2222 on both sides along the first direction, and each second active material layer 2222 is provided with a second insulating layer 2223 at both ends along the third direction.

[0136] By providing a first active material layer 2212 on both sides of the first current collector along the first direction, the energy density of the battery cell 20 is improved. Correspondingly, by providing a first insulating layer 2213 on both sides of the first current collector along the first direction, the risk of short circuit caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222 is reduced, which is beneficial to improving the reliability of the battery cell 20. Similarly, by providing a second active material layer 2222 on both sides of the second current collector along the first direction, the energy density of the battery cell 20 is improved. Correspondingly, by providing a second insulating layer 2223 on both sides of the second current collector along the first direction, the risk of short circuit caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222 is reduced, which is beneficial to improving the reliability of the battery cell 20.

[0137] Referring to Figures 3, 4, 5, and 6, in some embodiments, along a third direction, the length of the first insulating layer 2213 is L1, and the minimum distance between the two second insulating layers 2223 is L2, satisfying: L1 ≥ L2. And / or along a second direction, the length of the second insulating layer 2223 is L3, and the minimum distance between the two first insulating layers 2213 is L4, satisfying: L3 ≥ L4.

[0138] L1 represents the length of the first insulating layer 2213 along a third direction. During measurement, multiple measurements can be taken and the average value can be used as L1.

[0139] L2 represents the minimum distance between the two second insulating layers 2223 along a third direction. During measurement, multiple measurements can be taken and the average value can be used as L2.

[0140] L1≥L2 means that the length of the first insulating layer 2213 along the third direction is greater than or equal to the minimum distance between the two second insulating layers 2223 along the third direction.

[0141] L3 represents the length of the second insulating layer 2223 along the second direction. During measurement, multiple measurements can be taken and the average value can be used as L3.

[0142] L4 represents the minimum distance between the two first insulating layers 2213 along the second direction. During measurement, multiple measurements can be taken and the average value can be used as L4.

[0143] L3≥L4 means that the length of the second insulating layer 2223 along the second direction is greater than or equal to the minimum distance between the two first insulating layers 2213 along the second direction.

[0144] When L1 = L2 and L3 = L4, in the projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers 2213 located at both ends of the first active material layer 2212 and the orthographic projections of the two second insulating layers 2223 located at both ends of the second active material layer 2222 form a ring, and the orthographic projections of the first insulating layer 2213 and the second insulating layer 2223 have no overlapping portion. When L1 > L2 and L3 > L4, in the projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers 2213 located at both ends of the first active material layer 2212 and the orthographic projections of the two second insulating layers 2223 located at both ends of the second active material layer 2222 form a ring, and the orthographic projections of the first insulating layer 2213 and the second insulating layer 2223 have an overlapping portion. Therefore, when L1≥L2 and L3≥L4, the first insulating layer 2213 and the second insulating layer 2223 can work together to achieve better insulation, further reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222, which is more conducive to improving the reliability of the battery cell 20.

[0145] In other embodiments, the orthographic projection of the first insulating layer 2213 and the orthographic projection of the second insulating layer 2223 partially overlap in a projection plane perpendicular to the first direction.

[0146] When the orthographic projection of the first insulating layer 2213 onto the projection plane perpendicular to the first direction and the orthographic projection of the second insulating layer 2223 onto the projection plane perpendicular to the first direction overlap, the first insulating layer 2213 and the second insulating layer 2223 can work together to achieve better insulation, further reducing the risk of short circuits caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222, which is more conducive to improving the reliability of the battery cell 20.

[0147] Referring to Figures 3, 4, 5, and 6, in some embodiments, the thickness of the first insulating layer 2213 is less than the thickness of the first active material layer 2212; and / or the thickness of the second insulating layer 2223 is less than the thickness of the second active material layer 2222.

[0148] "The thickness of the first insulating layer 2213 is less than the thickness of the first active material layer 2212", which means that the maximum thickness of the first insulating layer 2213 is less than the minimum thickness of the first active material layer 2212.

[0149] "The thickness of the second insulating layer 2223 is less than the thickness of the second active material layer 2222", which means that the maximum thickness of the second insulating layer 2223 is less than the minimum thickness of the second active material layer 2222.

[0150] By making the thickness of the first insulating layer 2213 smaller than the thickness of the first active material layer 2212 and / or the thickness of the second insulating layer 2223 smaller than the thickness of the second active material layer 2222, the risk of interference between the first insulating layer 2213 and the second insulating layer 2223 during manufacturing is reduced. Furthermore, the smaller volume occupied by the first insulating layer 2213 and the second insulating layer 2223 helps to improve the energy density of the battery cell 20.

[0151] Referring to Figures 3, 4, 5, and 6, in some embodiments, the thickness of the first insulating layer 2213 is H1, satisfying: 2μm ≤ H1 ≤ 50μm. And / or the thickness of the second insulating layer 2223 is H2, satisfying: 2μm ≤ H2 ≤ 50μm.

[0152] H1 represents the thickness of the first insulating layer 2213. During measurement, multiple measurements can be taken and the average value can be used as H1.

[0153] The thickness of the first insulating layer 2213 can be: H1 = 2μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc.

[0154] When H1 ≥ 2 μm, the thickness of the first insulating layer 2213 is relatively large, which can effectively confine the first active material layer 2212 and reduce the risk of the active material of the first active material layer 2212 being extruded along one end in the second direction. When H1 ≤ 50 μm, the thickness of the first insulating layer 2213 is not too large, which can reduce the risk of interference with other components during manufacturing and facilitate manufacturing. Therefore, when 2 μm ≤ H1 ≤ 50 μm, it can both reduce the risk of the active material of the first active material layer 2212 being extruded along one end in the second direction and facilitate manufacturing.

[0155] H2 represents the thickness of the second insulating layer 2223. During measurement, multiple measurements can be taken and the average value can be used as H2.

[0156] The thickness of the second insulating layer 2223 can be: H2 = 2μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc.

[0157] The thickness of the first insulating layer 2213 can be equal to or different from the thickness of the second insulating layer 2223.

[0158] When H2 ≥ 2 μm, the thickness of the second insulating layer 2223 is relatively large, which can effectively confine the second active material layer 2222 and reduce the risk of the active material of the second active material layer 2222 being extruded along the third direction. When H2 ≤ 50 μm, the thickness of the second insulating layer 2223 is not too large, which can reduce the risk of interference with other components during manufacturing and facilitate manufacturing. Therefore, when 2 μm ≤ H2 ≤ 50 μm, it can both reduce the risk of the active material of the second active material layer 2222 being extruded along the third direction and facilitate manufacturing.

[0159] In some embodiments, the first insulating layer 2213 comprises boehmite or insulating adhesive. And / or the second insulating layer 2223 comprises boehmite or insulating adhesive.

[0160] Boehmite and insulating adhesive have good insulation properties and low cost, which helps to improve the reliability of the battery cell 20 and reduce manufacturing costs.

[0161] Please refer to Figures 7 and 8. Figure 7 is a first cross-sectional view of an electrode assembly 22 provided in some embodiments of this application. Figure 8 is a second cross-sectional view of an electrode assembly 22 provided in some embodiments of this application. In some embodiments, the electrode assembly 22 includes an insulating member 224, which surrounds a solid electrolyte layer 223. Along a first direction, the insulating member 224 abuts against a first insulating layer 2213 and a second insulating layer 2223, respectively.

[0162] The insulating element 224 has an insulating function and is disposed around the solid electrolyte layer 223. The insulating element 224 is disposed on the outside of at least one of the first active material layer 2212 and the second active material layer 2222 to reduce the risk of short circuit due to contact between the first active material layer 2212 and the second active material layer 2222. For example, the insulating element 224 may be made of plastic, rubber, etc.

[0163] The insulating member 224 is disposed around the solid electrolyte layer 223 and abuts against the first insulating layer 2213 and the second insulating layer 2223 respectively along the first direction. In this way, the insulating member 224 can surround the outside of at least one of the first active material layer 2212 and the second active material layer 2222, thereby restricting the active material of the first active material layer 2212 and the second active material layer 2222 from being squeezed out, reducing the risk of short circuit caused by the overlap of the active material of the first active material layer 2212 and the second active material layer 2222, which is beneficial to improving the reliability of the battery cell 20.

[0164] Referring to Figures 3, 4, 5, and 6, in some embodiments, the thickness of the first active material layer 2212 is H3, satisfying: 10 μm ≤ H3 ≤ 200 μm. And / or the thickness of the second active material layer 2222 is H4, satisfying: 10 μm ≤ H4 ≤ 200 μm.

[0165] H3 represents the thickness of the first active material layer 2212. During measurement, multiple measurements can be taken and the average value can be used as H3.

[0166] The thickness of the first active material layer 2212 can be: H3 = 10μm, 30μm, 50μm, 70μm, 90μm, 100μm, 120μm, 150μm, 180μm, 200μm, etc.

[0167] When 10μm≤H3≤200μm, the thickness of the first active material layer 2212 is moderate, which is beneficial to improving the energy density of the battery cell 20 and is also easy to manufacture.

[0168] H4 represents the thickness of the second active material layer 2222. During measurement, multiple measurements can be taken and the average value can be used as H4.

[0169] The thickness of the second active material layer 2222 can be: H4 = 10μm, 30μm, 50μm, 70μm, 90μm, 100μm, 120μm, 150μm, 180μm, 200μm, etc.

[0170] When 10μm≤H4≤200μm, the thickness of the second active material layer 2222 is moderate, which is beneficial to improving the energy density of the battery cell 20 and is also easy to manufacture.

[0171] Referring to Figures 4, 5, and 6, in some embodiments, this application also provides an electrode assembly 22, which includes a first electrode 221, a second electrode 222, and a solid electrolyte layer 223. The first electrode 221 includes a first current collector layer 2211, a first active material layer 2212, and a first insulating layer 2213. Along a first direction, the first active material layer 2212 and the first insulating layer 2213 are disposed on at least one side of the first current collector layer 2211, and along a second direction, the first insulating layer 2213 is disposed at both ends of the first active material layer 2212. The second electrode 222 has the opposite polarity to the first electrode 221. The second electrode 222 includes a second current collector layer 2221, a second active material layer 2222, and a second insulating layer 2223. Along a first direction, the second active material layer 2222 and the second insulating layer 2223 are disposed on at least one side of the second current collector layer 2221. Along a third direction, the second insulating layer 2223 is disposed at both ends of the second active material layer 2222. The solid electrolyte layer 223 is disposed between the first electrode 221 and the second electrode 222 along the first direction. The first direction, the second direction, and the third direction are not coplanar and intersect each other.

[0172] Referring to Figures 4, 5, and 6, in some embodiments, in a projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers 2213 located at both ends of the first active material layer 2212 and the orthographic projections of the two second insulating layers 2223 located at both ends of the second active material layer 2222 form a ring.

[0173] By forming a ring with the orthographic projection of the first insulating layer 2213 onto a projection plane perpendicular to the first direction and the orthographic projection of the second insulating layer 2223 onto a projection plane perpendicular to the first direction, the first insulating layer 2213 and the second insulating layer 2223 work together to achieve better insulation, further reducing the risk of short circuits caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222, which is more conducive to improving the reliability of the battery cell 20.

[0174] Referring to Figures 4, 5, and 6, in some embodiments, the first electrode 221 further includes a first tab 2214 connected to one end of the first current collector 2211 along a second direction; and / or the second electrode 222 further includes a second tab 2224 connected to one end of the second current collector 2221 along a third direction.

[0175] Two first insulating layers 2213 are disposed at both ends of the first active material layer 2212 along a second direction, and a first tab 2214 is connected to one end of the first current collector 2211 along the second direction. That is, the arrangement direction of the two first insulating layers 2213 is the same as the arrangement direction of the first tab 2214 and the first current collector 2211. This facilitates the continuous coating process during manufacturing, which helps reduce manufacturing costs. Similarly, two second insulating layers 2223 are disposed at both ends of the second active material layer 2222 along a third direction, and a second tab 2224 is connected to one end of the second current collector 2221 along the third direction. That is, the arrangement direction of the two second insulating layers 2223 is the same as the arrangement direction of the second tab 2224 and the second current collector 2221. This facilitates the continuous coating process during manufacturing, which helps reduce manufacturing costs.

[0176] Please refer to Figure 9, which is a schematic block diagram of an electrode assembly manufacturing method 30 provided in some embodiments of this application. This application also provides an electrode assembly manufacturing method 30, which includes:

[0177] Step S100: Provide a first electrode 221. The first electrode 221 includes a first current collector layer 2211, a first active material layer 2212, and a first insulating layer 2213. Along the first direction, the first active material layer 2212 and the first insulating layer 2213 are provided on at least one side of the first current collector layer 2211. Along the second direction, the first insulating layer 2213 is provided at both ends of the first active material layer 2212.

[0178] Step S200: Provide a second electrode 222, the second electrode 222 having the opposite polarity to the first electrode 221. The second electrode 222 includes a second current collector layer 2221, a second active material layer 2222, and a second insulating layer 2223. Along a first direction, at least one side of the second current collector layer 2221 is provided with the second active material layer 2222 and the second insulating layer 2223. Along a third direction, both ends of the second active material layer 2222 are provided with the second insulating layer 2223.

[0179] Step S300: Provide a solid electrolyte layer 223;

[0180] Step S400: The first electrode 221, the solid electrolyte layer 223, and the second electrode 222 are stacked along the first direction. The solid electrolyte layer 223 is disposed between the first electrode 221 and the second electrode 222 along the first direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0181] It should be noted that steps S100, S200 and S300 are not in any particular order and can be performed simultaneously.

[0182] Please refer to Figure 10, which is a schematic block diagram of an electrode assembly manufacturing method 30 provided in other embodiments of this application. In other embodiments, step S100 includes:

[0183] Step S110: Provide a first substrate;

[0184] Step S120: Along the extension direction of the first substrate, a first active substance slurry is coated on the first substrate to form a first active substance layer 2212.

[0185] Step S130: Apply a first insulating paste to the first substrate along the extension direction of the first substrate to form a first insulating layer 2213.

[0186] Step S140: Cut the first substrate having the first insulating layer 2213 and the first active material layer 2212 to form the first electrode 221.

[0187] In step S120, the first active material slurry can be applied to the first substrate by continuous coating to form the first insulating layer 2213.

[0188] In step S130, the first insulating paste can be applied to the first substrate by continuous coating to form the first insulating layer 2213.

[0189] It should be noted that steps S120 and S130 are not in any particular order and can be performed simultaneously.

[0190] Manufacturing the first electrode 221 by continuous coating helps to reduce manufacturing costs.

[0191] Please refer to Figure 11, which is a schematic block diagram of an electrode assembly manufacturing method 30 provided in some embodiments of this application. In some embodiments, step S200 includes:

[0192] Step S210: Provide a second substrate;

[0193] Step S220: Along the extension direction of the second substrate, a second active material slurry is applied to the second substrate to form a second active material layer 2222.

[0194] Step S230: Apply a second insulating paste to the second substrate along the extension direction of the second substrate to form a second insulating layer 2223.

[0195] Step S240: Cut the second substrate having the second insulating layer 2223 and the second active material layer 2222 to form the second electrode 222.

[0196] In step S220, a second active material slurry can be applied to the second substrate by continuous coating to form a second insulating layer 2223.

[0197] In step S230, the second insulating paste can be applied to the second substrate by continuous coating to form the second insulating layer 2223.

[0198] It should be noted that steps S220 and S230 are not in any particular order and can be performed simultaneously.

[0199] Manufacturing the second electrode 222 by continuous coating helps to reduce manufacturing costs.

[0200] This application embodiment also provides a battery device 100, which includes the aforementioned battery cell 20.

[0201] This application embodiment also provides an electrical device, which includes the aforementioned battery cell 20, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0202] Please refer to Figures 3 to 8 for some embodiments of this application.

[0203] This application provides a battery cell 20, which includes an electrode assembly 22. The electrode assembly 22 includes a first electrode 221, a second electrode 222, and a solid electrolyte layer 223. The first electrode 221 includes a first current collector 2211, a first active material layer 2212, and a first insulating layer 2213. Along a first direction, the first active material layer 2212 and the first insulating layer 2213 are disposed on at least one side of the first current collector 2211. Along a second direction, the first insulating layer 2213 is disposed at both ends of the first active material layer 2212. The second electrode 222 has the opposite polarity to the first electrode 221. The second electrode 222 includes a second current collector 2221, a second active material layer 2222, and a second insulating layer 2223. Along the first direction, the second active material layer 2222 and the second insulating layer 2223 are disposed on at least one side of the second current collector 2221. Along a third direction, the second insulating layer 2223 is disposed at both ends of the second active material layer 2222. A solid electrolyte layer 223 is disposed between the first electrode 221 and the second electrode 222 along a first direction. The first direction, the second direction, and the third direction intersect each other. Along the second direction, a first active material layer 2212 is disposed between two first insulating layers 2213, and along the third direction, a second active material layer 2222 is disposed between two second insulating layers 2223. During the manufacture of the electrode assembly 22, the first electrode 221, the solid electrolyte layer 223, and the second electrode 222 need to be extruded along the first direction. The two first insulating layers 2213 restrict the first active material layer 2212 in the second direction, making it difficult for the active material of the first active material layer 2212 to be extruded along one end of the second direction. When the active material of the first active material layer 2212 is extruded along one end of the third direction, the second insulating element 224 can play an insulating role, thereby reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222. Similarly, the two second insulating layers 2223 restrict the second active material layer 2222 in the third direction, making it difficult for the active material of the second active material layer 2222 to be extruded along one end in the third direction. When the active material of the second active material layer 2222 is extruded along one end in the second direction, the first insulating member 224 can play an insulating role, thereby reducing the risk of short circuit caused by the overlap of the active materials of the first active material layer 2212 and the second active material layer 2222, which is beneficial to improving the reliability of the battery cell 20.

[0204] In a projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers 2213 located at both ends of the first active material layer 2212 and the orthographic projections of the two second insulating layers 2223 located at both ends of the second active material layer 2222 form a ring. By making the orthographic projections of the first insulating layer 2213 and the second insulating layer 2223 in the same projection plane form a ring, the first insulating layer 2213 and the second insulating layer 2223 work together to achieve better insulation, further reducing the risk of short circuits caused by the overlap of the active materials in the first active material layer 2212 and the second active material layer 2222, which is more conducive to improving the reliability of the battery cell 20.

[0205] The first electrode 221 further includes a first tab 2214, which is connected to one end of the first current collector 2211 along the second direction. And / or the second electrode 222 further includes a second tab 2224, which is connected to one end of the second current collector 2221 along the third direction. Two first insulating layers 2213 are disposed at both ends of the first active material layer 2212 along the second direction, and the first tab 2214 is connected to one end of the first current collector 2211 along the second direction. That is, the arrangement direction of the two first insulating layers 2213 is the same as the arrangement direction of the first tab 2214 and the first current collector 2211. This facilitates the continuous coating process during manufacturing, which helps reduce manufacturing costs. Similarly, two second insulating layers 2223 are disposed at both ends of the second active material layer 2222 along a third direction, and the second tab 2224 is connected to one end of the second current collector 2221 along a third direction. That is, the arrangement direction of the two second insulating layers 2223 is the same as the arrangement direction of the second tab 2224 and the second current collector 2221. In this way, it is convenient to manufacture the second electrode 222 by continuous coating during manufacturing, which helps to reduce manufacturing costs.

[0206] The electrode assembly 22 includes an insulating member 224, which surrounds the solid electrolyte layer 223. Along a first direction, the insulating member 224 abuts against the first insulating layer 2213 and the second insulating layer 2223, respectively. Because the insulating member 224 surrounds the solid electrolyte layer 223 and abuts against the first insulating layer 2213 and the second insulating layer 2223, it surrounds the outer side of the first active material layer 2212 and the second active material layer 2222, thereby limiting the extrusion of active materials from the first active material layer 2212 and the second active material layer 2222. This reduces the risk of short circuits caused by the overlap of active materials in the first active material layer 2212 and the second active material layer 2222, and helps improve the reliability of the battery cell 20.

[0207] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, Includes an electrode assembly, the electrode assembly comprising: The first electrode includes a first current collector layer, a first active material layer and a first insulating layer. Along a first direction, the first active material layer and the first insulating layer are disposed on at least one side of the first current collector layer. Along a second direction, the first insulating layer is disposed at both ends of the first active material layer. The second electrode has the opposite polarity to the first electrode. The second electrode includes a second current collector layer, a second active material layer and a second insulating layer. Along the first direction, at least one side of the second current collector layer is provided with the second active material layer and the second insulating layer. Along the third direction, both ends of the second active material layer are provided with the second insulating layer. A solid electrolyte layer is disposed between the first electrode and the second electrode along the first direction, wherein the first direction, the second direction, and the third direction intersect each other.

2. The battery cell of claim 1, wherein, In a projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers located at both ends of the first active material layer and the orthographic projections of the two second insulating layers located at both ends of the second active material layer are connected end to end to form a ring.

3. The battery cell of claim 1 or 2, wherein, The first electrode further includes a first tab, which is connected to one end of the first current collector along the second direction; and / or The second electrode also includes a second tab, which is connected to one end of the second current collector along the third direction.

4. The battery cell of any one of claims 1-3, wherein, Along the first direction, the first active material layer and the first insulating layer are disposed on both sides of the first current collector layer; and / or Along the first direction, the second active material layer and the second insulating layer are provided on both sides of the second current collecting layer.

5. The battery cell of any one of claims 1-4, wherein, Along the third direction, the length of the first insulating layer is L1, and the minimum distance between the two second insulating layers is L2, satisfying: L1 ≥ L2; and / or Along the second direction, the length of the second insulating layer is L3, and the minimum distance between the two first insulating layers is L4, satisfying: L3≥L4.

6. The battery cell of any one of claims 1-5, wherein, In a projection plane perpendicular to the first direction, the orthographic projections of the first insulating layer and the second insulating layer partially overlap.

7. The battery cell of any one of claims 1-6, wherein, The thickness of the first insulating layer is less than the thickness of the first active material layer; and / or The thickness of the second insulating layer is less than the thickness of the second active material layer.

8. The battery cell of any one of claims 1-7, wherein, The thickness of the first insulating layer is H1, satisfying: 2μm≤H1≤50μm; and / or The thickness of the second insulating layer is H2, which satisfies: 2μm≤H2≤50μm.

9. The battery cell of any one of claims 1-8, wherein, The first insulating layer comprises boehmite or insulating adhesive; and / or The second insulating layer comprises boehmite or insulating adhesive.

10. The battery cell of any one of claims 1-9, wherein, The electrode assembly includes an insulating element disposed around the solid electrolyte layer, and along the first direction, the insulating element abuts against the first insulating layer and the second insulating layer, respectively.

11. The battery cell of any one of claims 1-10, wherein, The thickness of the first active material layer is H3, satisfying: 10μm≤H3≤200μm; and / or The thickness of the second active material layer is H4, which satisfies the following condition: 10μm≤H4≤200μm.

12. An electrode assembly, wherein, include: The first electrode includes a first current collector layer, a first active material layer and a first insulating layer. Along a first direction, the first active material layer and the first insulating layer are disposed on at least one side of the first current collector layer. Along a second direction, the first insulating layer is disposed at both ends of the first active material layer. The second electrode has the opposite polarity to the first electrode. The second electrode includes a second current collector layer, a second active material layer and a second insulating layer. Along the first direction, at least one side of the second current collector layer is provided with the second active material layer and the second insulating layer. Along the third direction, both ends of the second active material layer are provided with the second insulating layer. A solid electrolyte layer is disposed between the first electrode and the second electrode along the first direction, wherein the first direction, the second direction, and the third direction are not coplanar and intersect each other.

13. The electrode assembly of claim 12, wherein, In a projection plane perpendicular to the first direction, the orthographic projections of the two first insulating layers located at both ends of the first active material layer and the orthographic projections of the two second insulating layers located at both ends of the second active material layer form a ring.

14. The electrode assembly of claim 12 or 13, wherein, The first electrode further includes a first tab, which is connected to one end of the first current collector along the second direction; and / or The second electrode also includes a second tab, which is connected to one end of the second current collector along the third direction.

15. A method of manufacturing an electrode assembly, wherein, include: A first electrode is provided, the first electrode comprising a first current collector layer, a first active material layer and a first insulating layer. Along a first direction, the first active material layer and the first insulating layer are disposed on at least one side of the first current collector layer, and along a second direction, the first insulating layer is disposed at both ends of the first active material layer. A second electrode is provided, the polarity of which is opposite to that of the first electrode. The second electrode includes a second current collector layer, a second active material layer and a second insulating layer. Along the first direction, at least one side of the second current collector layer is provided with the second active material layer and the second insulating layer. Along the third direction, both ends of the second active material layer are provided with the second insulating layer. Provide a solid electrolyte layer; The first electrode, the solid electrolyte layer, and the second electrode are stacked along the first direction, with the solid electrolyte layer disposed between the first electrode and the second electrode along the first direction. The first direction, the second direction, and the third direction are perpendicular to each other.

16. The method of claim 15, wherein the step of applying the adhesive is performed after the step of applying the electrode assembly to the substrate. The provision of the first electrode includes: Provide the first substrate; Along the extension direction of the first substrate, a first active substance slurry is coated on the first substrate to form the first active substance layer accordingly; Along the extension direction of the first substrate, a first insulating paste is applied to the first substrate to form the first insulating layer accordingly; The first substrate having the first insulating layer and the first active material layer formed is cut to form the first electrode.

17. The method of claim 15 or 16, wherein the electrode assembly is manufactured by the method of claim 1. The provision of the second electrode includes: Provide a second substrate; Along the extension direction of the second substrate, a second active substance slurry is coated on the second substrate to form a corresponding second active substance layer; coating a second insulating paste on the second substrate along the extending direction of the second substrate to correspondingly form the second insulating layer; cutting the second substrate formed with the second insulating layer and the second active material layer to form the second electrode plate.

18. A battery device, wherein, The battery cell according to any one of claims 1-11.

19. An electrical device, comprising: The battery cell according to any one of claims 1-11, wherein the battery cell is used to provide electric energy for the electric device.

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