Electrode assembly, battery cell, battery apparatus, electrical apparatus, and manufacturing method

Abstract

The present application provides an electrode assembly, a battery cell, a battery apparatus, an electrical apparatus, and a manufacturing method. The electrode assembly comprises a first electrode sheet, a first solid-state electrolyte layer, a second electrode sheet, and an insulating layer. The first electrode sheet comprises a first main body portion and a first tab. The first main body portion is provided with the first solid-state electrolyte layer. The first electrode sheet and the second electrode sheet have opposite polarities. The second electrode sheet comprises a second main body portion. The area of the second main body portion is greater than the area of the first main body portion. The first solid-state electrolyte layer is located between the first main body portion and the second main body portion. The second main body portion comprises a thinned-edge portion extending in a circumferential direction. The insulating layer is disposed at the thinned-edge portion. The insulating layer has a notch. The first tab is disposed corresponding to the notch.

Description

Electrode assemblies, battery cells, battery devices, electrical devices and manufacturing methods

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411808156.2, filed on December 10, 2024, entitled “Electrode Assembly, Battery Cell, Battery Device, Electrical Device and Manufacturing Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and in particular to an electrode assembly, a battery cell, a battery device, an electrical device, and a manufacturing method. Background Technology

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. Improving battery safety has always been a key research direction in battery technology development. Summary of the Invention

[0005] In view of the above problems, this application provides an electrode assembly, a battery cell, a battery device, an electrical device, and a manufacturing method, which is beneficial to improving the safety of the battery device.

[0006] This application provides an electrode assembly including a first electrode, a first solid electrolyte layer, a second electrode, and an insulating layer. The first electrode includes a first body portion and a first tab. The first solid electrolyte layer is disposed on the first body portion. The first electrode and the second electrode have opposite polarities. The second electrode includes a second body portion. The area of ​​the second body portion is larger than the area of ​​the first body portion. The first solid electrolyte layer is located between the first body portion and the second body portion. The second body portion includes a circumferentially extending edge-thinned portion. An insulating layer is disposed on the edge-thinned portion. The insulating layer has a notch. The first tab is disposed corresponding to the notch.

[0007] In the electrode assembly of this application embodiment, an edge-thinned portion is provided on the second electrode. An insulating layer is provided within the edge-thinned portion. The height difference between the insulating layer and the second electrode is relatively small. The insulating layer can isolate the edge of the first solid electrolyte layer and the edge of the second main body, reducing the possibility of a short circuit between the first and second main bodies caused by cracking or detachment of the first solid electrolyte layer during pressing. A notch corresponding to the position of the first electrode tab is provided on the insulating layer. After the first electrode tab is closed, the notch can be used to avoid the first electrode tab, making it less likely for the first electrode tab to come into contact with the insulating layer. This reduces the possibility of the insulating layer applying compressive stress to the closed first electrode tab, causing uneven stress on the first electrode and resulting in local cracking, which is beneficial to improving the safety of the electrode assembly.

[0008] In some possible implementations, the first electrode includes a first connecting segment and a second connecting segment connected together. The first connecting segment is connected to the first main body and is provided with a notch. The first electrode includes an isolation portion, which is provided on the first connecting segment and extends beyond the insulation layer.

[0009] The isolation section provides protection for the first connecting segment. When the first tab is retracted, the first connecting segment and the isolation section can deform simultaneously, for example, by bending. After the first tab is retracted, a portion of the first connecting segment and a portion of the isolation section can enter the notch. The isolation section separates the first connecting segment from the second main body, reducing the possibility of a short circuit between the first connecting segment and the second electrode due to direct contact between them, further improving the safety of the electrode assembly.

[0010] In some feasible implementations, the isolation section includes a second solid electrolyte layer.

[0011] The second solid electrolyte layer can protect the first connecting section. When the first tab is closed and the second solid electrolyte layer comes into contact with the second main body, the second solid electrolyte can effectively isolate the first connecting section and the second main body, reducing the possibility of direct contact and short circuit between the first connecting section and the second main body.

[0012] In some feasible ways, the first solid electrolyte layer and the second solid electrolyte layer are integrally formed.

[0013] In the same processing step, using the same material to form the first solid electrolyte layer and the second solid electrolyte layer simultaneously helps to reduce processing steps, lower the processing difficulty of the second solid electrolyte layer, and also helps to ensure the consistency of the thickness of the first solid electrolyte layer and the thickness of the second solid electrolyte layer.

[0014] In some feasible embodiments, the first main body includes a first current collector, a first connecting section is connected to the first current collector, the first electrode includes a first active material layer, the first active material layer is disposed on both the first connecting section and the first current collector, and the first solid electrolyte layer and the second solid electrolyte layer are disposed on the first active material layer.

[0015] A portion of the first active material layer is located in the first connecting section, and the second solid electrolyte layer is located on the first active material layer. The thickness of the first active material layer disposed on the first connecting section and the first current collector is well consistent, which helps to ensure that the thickness of the first solid electrolyte layer and the second solid electrolyte layer are well consistent.

[0016] In some feasible ways, the width of the notch is greater than or equal to the width of the first tab.

[0017] After the first tab is closed, the gap in the insulation layer can avoid the first tab, which helps to reduce the possibility of the first tab coming into contact with the insulation layer and causing the insulation layer to apply compressive stress to the first tab.

[0018] In some feasible implementations, the insulating layer includes a first portion and a second portion, the second portion being located outside the first portion, the first portion overlapping the first solid electrolyte layer, and the second portion extending beyond the first solid electrolyte layer.

[0019] The edge region of the first solid electrolyte layer can cover the first part. The second part is located outside the first solid electrolyte layer. The first solid electrolyte layer does not cover the second part. In the event that the edge of the first solid electrolyte layer cracks or falls off during the pressing process, the insulating layer can still separate the first main body and the second main body in the area where the first solid electrolyte layer is cracked or fallen off, thereby reducing the possibility of contact and short circuit between the first main body and the second main body and improving the safety of the electrode assembly.

[0020] In some feasible ways, the surface of the insulating layer facing the first electrode is flush with the surface of the second body portion facing the first electrode.

[0021] Both the insulating layer and the second main body can contact the first solid electrolyte layer. During the pressing process, the area of ​​the first solid electrolyte layer corresponding to the insulating layer experiences relatively consistent stress with the area of ​​the first solid electrolyte layer corresponding to the second main body, resulting in uniform stress on the first solid electrolyte layer as a whole and reducing the possibility of cracking or detachment of the first solid electrolyte layer at the edges.

[0022] In some feasible embodiments, the second electrode includes a second tab and a second active material layer, the second main body includes a second current collector, the second tab is connected to the second current collector, the second current collector is provided with the second active material layer, and the second active material layer is provided with an edge thinning portion.

[0023] The insulating layer provides protection for the second active material layer. The edge material of the second active material layer is removed, thus preventing it from detaching during the pressing process and reducing the likelihood of a short circuit occurring between the first and second main body portions due to the second active material layer detaching.

[0024] In some feasible ways, the edge thinning portion does not penetrate the second active material layer along the thickness direction of the electrode assembly.

[0025] The second active material layer retains active material at the edge thinning portion, so that the second current collector is not exposed at the edge thinning portion. Thus, at the gap in the insulation layer, the second current collector is not exposed, reducing the possibility of a violent reaction due to direct contact between the first electrode and the second current collector.

[0026] In some possible implementations, the first electrode and the second electrode are located on the same side of the first body portion; or, the first electrode and the second electrode are located on opposite sides of the first body portion.

[0027] In some feasible ways, the insulating layer does not extend beyond the edge of the second body portion.

[0028] In the pressing process, an encapsulation film is used to encapsulate the overall structure consisting of the first electrode, the first solid electrolyte layer, the second electrode, and the insulating layer, before pressing. Ensuring that the insulating layer does not extend beyond the edge of the second main body helps reduce the possibility of mutual compression between the insulating layer and the encapsulation film.

[0029] In some feasible implementations, the first electrode is the positive electrode and the second electrode is the negative electrode.

[0030] In some feasible implementations, there is one first electrode, two second electrodes, one first electrode between the two second electrodes, and an edge thinning section is provided on one side of the second main body.

[0031] In some feasible methods, there are two or more first electrodes and three or more second electrodes, with the second electrodes and first electrodes arranged alternately. On the two outermost second electrodes, an edge thinning portion is provided on one side of the second main body. On the second electrodes located between adjacent first electrodes, edge thinning portions are provided on both sides of the second main body.

[0032] This application provides a battery cell that includes the electrode assembly described above.

[0033] This application provides a battery device comprising a battery cell as described above.

[0034] This application provides an electrical device including the battery device described above. The battery device is used to provide electrical energy.

[0035] This application provides a method for manufacturing an electrode assembly, which includes:

[0036] A first electrode is provided, the first electrode comprising a first body portion and a first electrode tab;

[0037] A first solid electrolyte layer is disposed on the first main body, and the first electrode and the first solid electrolyte layer form a first electrode assembly;

[0038] A second electrode is provided, the second electrode including a second main body portion, the area of ​​the second main body portion being larger than the area of ​​the first main body portion, the second main body portion including an edge thinning portion extending circumferentially;

[0039] An insulating layer is provided within the edge thinning portion, the insulating layer has a notch, and the insulating layer and the second electrode form a second electrode assembly;

[0040] The first electrode assembly and the second electrode assembly are stacked, with the first solid electrolyte layer located between the first main body and the second main body, and the first electrode tab is provided with a corresponding notch. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

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

[0043] Figure 2 is a partially exploded structural diagram of a battery device provided in an embodiment of this application;

[0044] Figure 3 is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0045] Figure 4 is a partial exploded view of a battery cell provided in an embodiment of this application;

[0046] Figure 5 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0047] Figure 6 is an enlarged schematic diagram of point M in Figure 5;

[0048] Figure 7 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0049] Figure 8 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0050] Figure 9 is a partial cross-sectional view of the first tab of an electrode assembly provided in an embodiment of this application during its retraction process;

[0051] Figure 10 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0052] Figure 11 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0053] Figure 12 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0054] Figure 13 is a partially exploded structural diagram of the first electrode provided in an embodiment of this application;

[0055] Figure 14 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0056] Figure 15 is a partial cross-sectional view of an electrode assembly provided in one embodiment of this application;

[0057] Figure 16 is a partially exploded structural diagram of the second electrode provided in an embodiment of this application;

[0058] Figure 17 is a partial cross-sectional view of an electrode assembly provided in one embodiment of this application;

[0059] Figure 18 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0060] Figure 19 is a schematic diagram of the manufacturing process of an electrode assembly provided in one embodiment of this application.

[0061] Explanation of reference numerals in the attached drawings: 1. Vehicle; 10. Battery assembly; 10a. Housing; 10b. First housing section; 10c. Second housing section; 11. Controller; 12. Motor; 20. Battery module; 30. Battery cell; 40. End cap; 41. Electrode terminal; 50. Housing; 60. Electrode assembly; 70. First electrode; 71. First main body section; 711. First current collector; 72. First tab; 721. First connecting section; 722. Second connecting section; 73. Isolation section; 731. 74. Second solid electrolyte layer; 80. First active material layer; 90. Second electrode; 91. Second main body; 911. Edge thinning portion; 912. Second current collector; 92. Second tab; 93. Second active material layer; 100. Insulating layer; 101. Notch; 102. First part; 103. Second part; 110. First electrode assembly; 120. Second electrode assembly; X, length direction; Y, width direction; Z, thickness direction. Detailed Implementation

[0062] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0063] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0064] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied 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 device applications, market demand is also constantly increasing.

[0069] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0070] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. The battery device mentioned in this application can be a battery pack. For example, the battery device mentioned in this application can include battery modules, etc. A battery device generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0071] A single battery cell includes an electrode assembly. The electrode assembly consists of a positive electrode and a negative electrode. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0072] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab connected to the positive current collector portion. The positive current collector portion is coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes the positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0073] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer. The material of the negative current collector can be copper. The negative active material layer includes the negative active material. The negative active material can be carbon or silicon, etc.

[0074] An electrode assembly is the component in a battery cell where electrochemical reactions occur. The electrode assembly includes a positive electrode, a negative electrode, and an interlayer dielectric layer. An interlayer dielectric layer is disposed between the positive and negative electrode. The interlayer dielectric layer may include a solid electrolyte layer. When the electrode assembly formed by stacking the positive electrode, solid electrolyte layer, and negative electrode is applied to a battery cell, the battery cell is a solid-state battery, thus eliminating the need for liquid electrolyte filling within the battery cell. Exemplarily, the solid electrolyte layer may be a sulfide-based solid electrolyte, an oxide-based solid electrolyte, or a polymer-based solid electrolyte.

[0075] During the manufacturing process of the electrode assembly, the positive electrode, solid electrolyte layer, and negative electrode are stacked and pressed to ensure tight contact between each layer of the positive electrode, solid electrolyte layer, and negative electrode.

[0076] For example, the positive and negative electrode plates each have a main body portion. The portions of the positive and negative electrode plates extending from the main body portion constitute tabs. The positive and negative tabs may be located together at one end of the main body portion or separately at both ends of the main body portion. During the charging and discharging process of the battery, the positive and negative active materials undergo an electrochemical reaction with the solid electrolyte layer, and the tabs connect to the electrode terminals to form a current loop.

[0077] In related technologies, for solid-state batteries, to improve the contact between the solid electrolyte layer and the electrode, a pressing process is required to press the stacked solid electrolyte layer and electrode. During the pressing process, compressive stress is applied to both sides of the stacked solid electrolyte layer and electrode along the thickness direction. However, during the pressing process, there is a possibility that the edges of the solid electrolyte layer may crack or fall off, resulting in the edges of the electrode not being isolated by the solid electrolyte layer, thus leading to direct contact between the electrodes and the possibility of a short circuit. To solve the above problem, one approach is to place an insulating layer at the edge of the electrode to isolate the edge of the solid electrolyte layer from the edge of the electrode, reducing the possibility of a short circuit. However, the tabs of the electrode need to be folded towards one side of the electrode assembly and connected to the electrode terminals. After the tabs of the electrode are folded, there is a possibility that the insulating layer may come into contact with the tabs and apply pressure to the tabs, resulting in uneven stress on the electrode and cracking, affecting the safety of the electrode assembly.

[0078] To alleviate the problem of cracking caused by uneven stress on the electrode, a notch can be made in the insulation layer so that the tab does not come into contact with the insulation layer after it is closed.

[0079] Based on the above considerations, to alleviate the problem of cracking caused by uneven stress on the electrode sheets, the inventors, after in-depth research, designed an electrode assembly. In this electrode assembly, an insulating layer is provided on the electrode sheet to isolate the edge of the solid electrolyte layer from the edge of the electrode sheet, reducing the possibility of short circuits between the pressed electrodes. The area of ​​the insulating layer corresponding to the tab is set as a notch. After the tab is closed, the notch can avoid the tab, so that the tab and the insulating layer will not come into contact. Therefore, the insulating layer will not apply compressive stress to the tab, reducing the possibility of cracking caused by uneven stress on the electrode sheet and improving the safety of the electrode assembly.

[0080] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0081] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0082] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0083] Referring to Figure 1, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. The battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12. For example, this is for the power needs of vehicle 1 during starting, navigation, and driving.

[0084] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0085] To meet different power demands, the battery device 10 may include multiple battery cells. A battery cell is the smallest unit that makes up a battery module or battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery device mentioned in this application includes a battery module or battery pack. Multiple battery cells can be connected in series, parallel, or a combination thereof. A combination thereof refers to a mix of series and parallel connections. In the embodiments of this application, multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into a battery module, and then the battery modules can be assembled into a battery pack.

[0086] Referring to Figure 2, the battery device 10 includes a housing 10a and individual battery cells (not shown). The individual battery cells are housed within the housing 10a.

[0087] The housing 10a can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10a can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0088] The housing 10a is used to accommodate individual battery cells, and the housing 10a can have various structures. In some embodiments, the housing 10a may include a first housing portion 10b and a second housing portion 10c. The first housing portion 10b and the second housing portion 10c overlap each other. The first housing portion 10b and the second housing portion 10c together define a receiving space for accommodating the individual battery cells. The second housing portion 10c may be a hollow structure with one open end. In some embodiments, the first housing portion 10b is a plate-like structure. The first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. In some embodiments, both the first housing portion 10b and the second housing portion 10c may also be hollow structures with one open side. The open side of the first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. Of course, the first housing portion 10b and the second housing portion 10c can have various shapes, such as cylinders, cuboids, etc.

[0089] To improve the sealing performance after the first housing part 10b and the second housing part 10c are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 10b and the second housing part 10c.

[0090] In some embodiments, the first housing portion 10b covers the top of the second housing portion 10c. The first housing portion 10b may also be referred to as the upper housing cover, and the second housing portion 10c may also be referred to as the lower housing.

[0091] In the battery device 10, there can be one or more battery cells. When there are multiple battery cells, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 10a. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery module. Multiple battery modules can then be connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 10a.

[0092] In some embodiments, as shown in FIG3, there may be multiple battery cells 30. Multiple battery cells 30 are first connected in series, parallel, or in a mixed manner to form a battery module 20. Multiple battery modules 20 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the housing 10a.

[0093] Multiple battery cells 30 in the battery module 20 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 30 in the battery module 20.

[0094] In this embodiment, the battery cell 30 may include a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this embodiment is not limited thereto. The battery cell 30 may be flat, cuboid, or other shapes, and this embodiment is not limited thereto either. However, for the sake of brevity, the following embodiment uses a cuboid battery cell 30 as an example for illustration.

[0095] The battery cell 30 refers to the smallest unit that makes up the battery device 10. As shown in Figure 4, the battery cell 30 includes an end cap 40, a housing 50, and an electrode assembly 60.

[0096] End cap 40 refers to a component that covers the opening of housing 50 to isolate the internal environment of battery cell 30 from the external environment. Exemplarily, the shape of end cap 40 can be adapted to the shape of housing 50 to fit the housing 50. Exemplarily, end cap 40 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 40 is not easily deformed under pressure or impact, enabling battery cell 30 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 41 can be provided on end cap 40. Electrode terminals 41 can be used for electrical connection with the tabs of electrode assembly 60 for outputting or inputting electrical energy into battery cell 30.

[0097] In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold. The end cap 40 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40. The insulating component can be used to isolate the electrical connection components within the housing 50 from the end cap 40 to reduce the risk of short circuits. Exemplarily, the insulating component can be plastic, rubber, etc.

[0098] The housing 50 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 30. The formed internal environment can accommodate the electrode assembly 60 and other components. The housing 50 and the end cap 40 can be independent components. An opening can be provided on the housing 50, and the end cap 40 closes the opening to form the internal environment of the battery cell 30. Alternatively, the end cap 40 and the housing 50 can be integrated. Specifically, the end cap 40 and the housing 50 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 50, the end cap 40 closes the housing 50. The housing 50 can have various shapes and sizes, such as cuboid, hexagonal prism, etc. Specifically, the shape of the housing 50 can be determined according to the specific shape and size of the electrode assembly 60. The material of the housing 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0099] Referring to Figures 5, 6, 7 and 8, an embodiment of this application provides an electrode assembly 60, which includes a first electrode 70, a first solid electrolyte layer 80, a second electrode 90 and an insulating layer 100.

[0100] The first electrode 70 includes a first body portion 71 and a first tab 72. A first solid electrolyte layer 80 is disposed on the first body portion 71. The first electrode 70 and the second electrode 90 have opposite polarities. The second electrode 90 includes a second body portion 91. The area of ​​the second body portion 91 is larger than the area of ​​the first body portion 71. The first solid electrolyte layer 80 is located between the first body portion 71 and the second body portion 91. The second body portion 91 includes an edge thinning portion 911 extending circumferentially. An insulating layer 100 is disposed on the edge thinning portion 911. The insulating layer 100 has a notch 101. The first tab 72 is disposed corresponding to the notch 101.

[0101] In this embodiment, the edge thinning portion 911 of the second main body portion 91 refers to the space formed after removing a portion of the material from the edge of the second main body portion 91. The thickness of the second main body portion 91 in the edge thinning portion 911 region is less than the thickness of the region where the edge thinning portion 911 is not provided. The insulating layer 100 may be provided within the edge thinning portion 911 to reduce the height difference between the insulating layer 100 and the second main body portion 91. The insulating layer 100 is used to isolate the first solid electrolyte layer 80 and the second main body portion 91, reducing the possibility of a short circuit between the first main body portion 71 and the second main body portion 91 due to cracking or detachment of the edge of the first solid electrolyte layer 80 during the pressing process.

[0102] The first tab 72 is positioned corresponding to the notch 101 along the thickness direction Z of the electrode assembly 60, with the first tab 72 facing the notch 101 and its lead-out position corresponding to the position of the notch 101. The thickness direction Z of the electrode assembly 60 refers to the stacking direction of the first main body 71, the first solid electrolyte layer 80, and the second main body 91. The first main body 71 and the second main body 91 have different areas. A stepped structure is formed between the first main body 71 and the second main body 91. The second main body 91 has a portion extending beyond the first main body 71, and the root region of the first tab 72 extends beyond the portion of the second main body 91 beyond the first main body 71.

[0103] Referring to Figure 9, when the first tab 72 is retracted, the root region of the first tab 72 will deform, for example, bend. After the first tab 72 is retracted, a portion of the root region of the first tab 72 can enter the notch 101, allowing the insulating layer 100 to avoid the first tab 72. This helps to reduce the possibility of the insulating layer 100 applying compressive stress to the first tab 72 due to contact between the first tab 72 and the insulating layer 100.

[0104] In the electrode assembly 60 of this application embodiment, an edge thinning portion 911 is provided on the second electrode 90. An insulating layer 100 is provided within the edge thinning portion 911. The height difference between the insulating layer 100 and the second electrode 90 is relatively small. The insulating layer 100 can isolate the edge of the first solid electrolyte layer 80 and the edge of the second main body 91, reducing the possibility of a short circuit between the first main body 71 and the second main body 91 due to cracking or detachment of the first solid electrolyte layer 80 during the pressing process. A notch 101 corresponding to the position of the first tab 72 is provided on the insulating layer 100. After the first tab 72 is closed, the notch 101 can be used to avoid the first tab 72, making it less likely for the first tab 72 to come into contact with the insulating layer 100. This reduces the possibility of the insulating layer 100 applying compressive stress to the closed first tab 72, causing uneven stress on the first electrode 70 and resulting in local cracking, which is beneficial to improving the safety of the electrode assembly 60.

[0105] In some possible implementations, the edge thinning portion 911 on the second main body portion 91 can be annular. The insulating layer 100 can be a non-closed annular structure. The insulating layer 100 can be discontinuous at the notch 101.

[0106] In some feasible ways, the material of the insulating layer 100 may include, but is not limited to, one or more of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber.

[0107] In some feasible implementations, referring to Figures 10 and 11, both the first main body 71 and the second main body 91 can be rectangular. The length of the first main body 71 is C2, and the length of the second main body 91 is C1, where C1 is greater than C2. The width of the first main body 71 is L2, and the width of the second main body 91 is L1, where L1 is greater than L2. In the length direction X, both ends of the second main body 91 extend beyond the first main body 71. In the width direction Y, both ends of the second main body 91 extend beyond the first main body 71.

[0108] In some feasible embodiments, referring to Figure 12, the first electrode 70 and the first solid electrolyte layer 80 can be composited to form a first electrode assembly 110. The second electrode 90 and the insulating layer 100 can be composited to form a second electrode assembly 120. After the first electrode assembly 110 and the second electrode assembly 120 are each manufactured, the first electrode assembly 110 and the second electrode assembly 120 can be stacked together to form an electrode assembly 60.

[0109] In some possible implementations, referring to Figures 9 and 13, the first electrode tab 72 includes a first connecting segment 721 and a second connecting segment 722 connected together. The first connecting segment 721 is connected to the first main body portion 71. The first connecting segment 721 extends beyond the portion of the second main body portion 91 beyond the first main body portion 71 and is extended outward. The first connecting segment 721 is provided corresponding to the notch 101. The first electrode plate 70 includes an isolation portion 73. The isolation portion 73 is provided on the first connecting segment 721. The isolation portion 73 extends beyond the insulating layer 100.

[0110] The isolation portion 73 can protect the first connecting segment 721. After the first electrode tab 72 is retracted, the first connecting segment 721 and the isolation portion 73 can deform simultaneously, for example, by bending. After the first electrode tab 72 is retracted, a portion of the first connecting segment 721 and a portion of the isolation portion 73 can enter the notch 101. The isolation portion 73 can isolate the first connecting segment 721 and the second main body 91, reducing the possibility of a short circuit between the first connecting segment 721 and the second electrode 90 caused by direct contact between the first connecting segment 721 and the second main body 91, and further improving the safety of the electrode assembly 60.

[0111] The second connecting segment 722 is located on the side of the first connecting segment 721 away from the first main body portion 71. The second connecting segment 722 is used to connect to the electrode terminal 41. For example, the second connecting segment 722 is used to weld to the electrode terminal 41.

[0112] In some examples, the isolation portion 73 is connected to the first solid electrolyte layer 80. The orthographic projection of the isolation portion 73 onto the first connection segment 721 coincides with the first connection segment 721.

[0113] In some examples, isolation portions 73 may be provided on both sides of the first connecting segment 721 along the thickness direction Z of the electrode assembly 60.

[0114] In some examples, referring to Figures 10 and 11, both the first main body portion 71 and the second main body portion 91 are rectangular. The length of the first main body portion 71 is C2. The first tab 72 extends along the length direction X. The length of the second main body portion 91 is C1. In the length direction X, the length of the first tab 72 is W1. In the length direction X, the dimension W of the insulating portion 73 is greater than (C1 - C2) / 2 and less than W1, so that the insulating portion 73 extends beyond the insulating layer 100.

[0115] The width of the first main body portion 71 is L2, and the width of the second main body portion 91 is L1, wherein L1 is greater than L2. In the width direction Y, the width of the first electrode tab 72 is equal to the width of the isolation portion 73. In the width direction Y, the dimension of the isolation portion 73 is B.

[0116] In some examples, referring to Figure 14, the isolation portion 73 includes a second solid electrolyte layer 731. The second solid electrolyte layer 731 can protect the first connecting segment 721. When the first tab 72 is retracted and the second solid electrolyte layer 731 comes into contact with the second main body 91, the second solid electrolyte can effectively isolate the first connecting segment 721 and the second main body 91, reducing the possibility of direct contact and short circuit between the first connecting segment 721 and the second main body 91.

[0117] In some examples, the material of the first solid electrolyte layer 80 and the material of the second solid electrolyte layer 731 are the same, so that the first solid electrolyte layer 80 and the second solid electrolyte layer 731 can be formed using the same material, reducing the processing difficulty of the second solid electrolyte layer 731.

[0118] In some examples, the first solid electrolyte layer 80 and the second solid electrolyte layer 731 are integrally formed. Forming the first solid electrolyte layer 80 and the second solid electrolyte layer 731 simultaneously using the same material in the same processing step reduces processing steps, lowers the processing difficulty of the second solid electrolyte layer 731, and also helps ensure consistency in the thickness of the first solid electrolyte layer 80 and the second solid electrolyte layer 731.

[0119] In some examples, a coating process is used to coat solid electrolyte material onto the first body portion 71 and the first tab 72 to form a first solid electrolyte layer 80 and a second solid electrolyte layer 731.

[0120] In some feasible ways, the width of the notch 101 is greater than or equal to the width of the first tab 72.

[0121] After the first tab 72 is closed, the notch 101 of the insulating layer 100 can avoid the first tab 72, which helps to reduce the possibility that the first tab 72 will come into contact with the insulating layer 100 and cause the insulating layer 100 to apply compressive stress to the first tab 72.

[0122] In some possible implementations, as shown in Figures 13, 14, and 15, the first main body 71 includes a first current collector 711. A first connecting segment 721 is connected to the first current collector 711. The first electrode 70 includes a first active material layer 74. The first active material layer 74 is disposed on both the first connecting segment 721 and the first current collector 711. A first solid electrolyte layer 80 and a second solid electrolyte layer 731 are both disposed on the first active material layer 74.

[0123] A portion of the first active material layer 74 is located on the first connecting section 721, and the second solid electrolyte layer 731 is located on the first active material layer 74. The thickness of the first active material layer 74 disposed on the first connecting section 721 and the first current collector 711 is well consistent, which helps to ensure that the thickness of the first solid electrolyte layer 80 and the second solid electrolyte layer 731 is well consistent.

[0124] In some examples, a coating process is used to coat a solid electrolyte material onto the first active material layer 74 to simultaneously form a first solid electrolyte layer 80 and a second solid electrolyte layer 731. Exemplarily, the sum of the areas of the first solid electrolyte layer 80 and the second solid electrolyte layer 731 may be equal to the area of ​​the first active material layer 74.

[0125] In some possible implementations, referring to Figure 15, the insulating layer 100 includes a first portion 102 and a second portion 103. The second portion 103 is located outside the first portion 102. The first portion 102 overlaps with the first solid electrolyte layer 80. The second portion 103 extends beyond the first solid electrolyte layer 80.

[0126] The edge region of the first solid electrolyte layer 80 can cover the first portion 102. The second portion 103 is located outside the first solid electrolyte layer 80. The first solid electrolyte layer 80 does not cover the second portion 103. In the event that the edge of the first solid electrolyte layer 80 cracks or falls off during the pressing process, the insulating layer 100 can still separate the first main body portion 71 and the second main body portion 91 in the area where the first solid electrolyte layer 80 is cracked or falls off, thereby reducing the possibility of contact and short circuit between the first main body portion 71 and the second main body portion 91 and improving the safety of the electrode assembly 60.

[0127] In some examples, the surface of the insulating layer 100 facing the first electrode 70 is flush with the surface of the second body portion 91 facing the first electrode 70.

[0128] Both the insulating layer 100 and the second main body 91 can contact the first solid electrolyte layer 80. During the pressing process, the area of ​​the first solid electrolyte layer 80 corresponding to the insulating layer 100 is subjected to relatively consistent stress with the area of ​​the first solid electrolyte layer 80 corresponding to the second main body 91, so that the first solid electrolyte layer 80 is subjected to uniform stress as a whole, reducing the possibility of the first solid electrolyte layer 80 cracking or falling off at the edges.

[0129] If there is a significant height difference between the insulating layer 100 and the second main body 91, the insulating layer 100 will create a raised area at the edge of the first solid electrolyte layer 80. During the pressing process, the edge of the first solid electrolyte layer 80 experiences greater stress, resulting in uneven stress distribution across the entire first solid electrolyte layer 80. This can lead to the possibility of cracking or detachment of the first solid electrolyte layer 80 at its edge. In this embodiment, the insulating layer 100 is flush with the second main body 91 along the thickness direction Z of the electrode assembly 60, which helps to solve the above-mentioned technical problems.

[0130] In some possible implementations, as shown in Figures 15 and 16, the second electrode 90 includes a second tab 92 and a second active material layer 93. The second main body 91 includes a second current collector 912. The second tab 92 is connected to the second current collector 912. The second current collector 912 is provided with the second active material layer 93. The second active material layer 93 is provided with an edge thinning portion 911.

[0131] The insulating layer 100 can protect the second active material layer 93. The edge material of the second active material layer 93 is removed, so that the edge of the second active material layer 93 is less likely to fall off during the pressing process, reducing the possibility that the first main body portion 71 and the second main body portion 91 will be connected through the active material and short-circuit due to the second active material layer 93 falling off.

[0132] In some examples, the edge thinning portion 911 does not penetrate the second active material layer 93 along the thickness direction Z of the electrode assembly 60. The second active material layer 93 retains active material at the edge thinning portion 911, so that the second current collector 912 is not exposed at the edge thinning portion 911. Thus, the second current collector 912 is not exposed at the notch 101 of the insulating layer 100, reducing the possibility of a violent reaction due to direct contact between the first electrode tab 72 and the second current collector 912.

[0133] In some examples, an isolation portion 73 is provided on the first connecting segment 721. The isolation portion includes a second solid electrolyte layer 731. After the first tab 72 is closed, the first connecting segment 721 and the second solid electrolyte layer 731 undergo simultaneous bending deformation. At the notch 101 of the insulating layer 100, the second active material layer 93 can separate the second solid electrolyte layer 731 and the second current collector 912, reducing the possibility of affecting electrical performance due to direct contact between the second solid electrolyte layer 731 and the second current collector 912.

[0134] In some examples, the first electrode 72 and the second electrode 92 may be located on the same side of the first body portion 71. The first electrode 72 and the second electrode 92 extend from the same side. The first electrode 72 and the second electrode 92 are spaced apart.

[0135] In some examples, the first electrode 72 and the second electrode 92 are located on opposite sides of the first body portion 71. The first electrode 72 and the second electrode 92 extend from opposite sides respectively.

[0136] In some feasible implementations, the insulating layer 100 does not extend beyond the edge of the second body portion 91. In the pressing process, an encapsulation film is used to encapsulate the stacked structure of the first electrode 70, the first solid electrolyte layer 80, the second electrode 90, and the insulating layer 100 before pressing. The arrangement that the insulating layer 100 does not extend beyond the edge of the second body portion 91 helps reduce the possibility of mutual compression between the insulating layer 100 and the encapsulation film.

[0137] In some examples, referring to Figures 10 and 11, both the first main body portion 71 and the second main body portion 91 are rectangular. The length of the first main body portion 71 is C2, and the length of the second main body portion 91 is C1, where C1 is greater than C2. The width of the first main body portion 71 is L2, and the width of the second main body portion 91 is L1, where L1 is greater than L2. Exemplarily, the width of the insulating layer 100 can be L0. Wherein, in the length direction X, L0 ≤ (C1 - C2) / 2, and in the width direction Y, L0 ≤ (L1 - L2) / 2. In the length direction X, the length of the first tab 72 is W1. In the length direction X, the dimension W of the insulating portion 73 is greater than (C1 - C2) / 2 and less than W1. The dimension W of the insulating portion 73 is greater than the width L0 of the insulating layer 100.

[0138] In some examples, the edge of the insulating layer 100 is flush with the edge of the second body portion 91.

[0139] In some feasible implementations, the first electrode 70 is a positive electrode. The materials of the first tab 72 and the first current collector 711 can be aluminum. The first active material layer 74 includes a positive active material. The positive active material can include lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0140] The second electrode 90 is the negative electrode. The materials of the second electrode tab 92 and the second current collector 912 can be copper. The second active material layer 93 includes a negative electrode active material. The negative electrode active material can include carbon or silicon, etc.

[0141] In some possible implementations, referring to FIG17, the electrode assembly 60 may include one first electrode 70 and two second electrodes 90. The number of first electrodes 70 is one. The number of second electrodes 90 is two. A first electrode 70 is disposed between the two second electrodes 90. An edge thinning portion 911 is provided on the side of the second main body 91 facing the first electrode 70. An insulating layer 100 is disposed within the edge thinning portion 911.

[0142] In some examples, the thickness of the insulating layer 100 is H0. The thickness of the second main body 91 in the region of the edge thinning portion 911 is H1. The thickness of the second main body 91 in the region where the edge thinning portion 911 is not provided is H. The sum of H0 and H1 can be equal to H.

[0143] In some possible implementations, referring to Figure 18, the electrode assembly 60 includes two or more first electrodes 70 and three or more second electrodes 90. The number of first electrodes 70 is two or more. The number of second electrodes 90 is three or more. The second electrodes 90 and first electrodes 70 are alternately arranged. The difference between the number of second electrodes 90 and the number of first electrodes 70 is 1. In the electrode assembly 60, the two outermost electrodes can be second electrodes 90. On the two outermost second electrodes 90, an edge thinning portion 911 is provided on the side of the second main body portion 91 facing the first electrode 70. On the second electrodes 90 located between adjacent first electrodes 70, edge thinning portions 911 are provided on both sides of the second main body portion 91.

[0144] In some examples, for the second electrode 90 with an edge thinning portion 911 provided on one side of the second main body 91, the thickness of the insulating layer 100 is H0, the thickness of the second main body 91 in the area with the edge thinning portion 911 is H1, and the thickness of the second main body 91 in the area without the edge thinning portion 911 is H, wherein the sum of H0 and H1 can be equal to H.

[0145] For the second electrode 90 with edge thinning portions 911 respectively on both sides of the second main body 91, the thickness of the insulating layer 100 is H0, the thickness of the second main body 91 in the area with the edge thinning portion 911 is H1, and the thickness of the second main body 91 in the area without the edge thinning portion 911 is H, wherein the sum of 2H0 and H1 can be equal to H.

[0146] This application also provides a battery cell 30, which includes an electrode assembly 60 from any of the above embodiments.

[0147] This application also provides a battery device 10, including a battery cell 30 from any of the above embodiments.

[0148] This application also provides an electrical device, including a battery device 10 according to any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems that utilize the battery device 10.

[0149] Referring to Figure 19, this application embodiment also provides a method for manufacturing an electrode assembly 60, which includes:

[0150] A first electrode 70 is provided, the first electrode including a first body portion 71 and a first electrode tab 72;

[0151] A first solid electrolyte layer 80 is disposed on the first main body 71, and the first electrode 70 and the first solid electrolyte layer 80 form a first electrode assembly 110.

[0152] A second electrode 90 is provided, the second electrode including a second body portion 91, the area of ​​the second body portion being larger than the area of ​​the first body portion 71, the second body portion 91 including an edge thinning portion 911 extending circumferentially;

[0153] An insulating layer 100 is provided in the edge thinning portion, the insulating layer has a notch 101, and the insulating layer and the second electrode 90 form a second electrode assembly 120.

[0154] The first electrode assembly 110 and the second electrode assembly 120 are stacked, the first solid electrolyte layer 80 is located between the first main body 71 and the second main body 91, and the first tab 72 is provided corresponding to the notch 101.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode assembly, wherein, include: The first electrode plate includes a first main body and a first electrode tab; A first solid electrolyte layer is disposed on the first main body portion; The second electrode has the opposite polarity to the first electrode. The second electrode includes a second main body portion with an area larger than that of the first main body portion. The first solid electrolyte layer is located between the first main body portion and the second main body portion. The second main body portion includes an edge thinning portion extending circumferentially. An insulating layer is disposed at the edge thinning portion, the insulating layer having a notch, and the first electrode tab is disposed corresponding to the notch.

2. The electrode assembly according to claim 1, wherein, The first electrode tab includes a first connecting segment and a second connecting segment connected together. The first connecting segment is connected to the first main body and is provided corresponding to the notch. The first electrode includes an isolation portion, which is provided on the first connecting segment and extends beyond the insulating layer.

3. The electrode assembly according to claim 2, wherein, The isolation section includes a second solid electrolyte layer.

4. The electrode assembly according to claim 3, wherein, The first solid electrolyte layer and the second solid electrolyte layer are integrally formed.

5. The electrode assembly according to claim 3 or 4, wherein, The first main body includes a first current collector, the first connecting section is connected to the first current collector, the first electrode includes a first active material layer, the first active material layer is disposed on both the first connecting section and the first current collector, and the first solid electrolyte layer and the second solid electrolyte layer are disposed on the first active material layer.

6. The electrode assembly according to any one of claims 1 to 5, wherein, The width of the notch is greater than or equal to the width of the first tab.

7. The electrode assembly according to any one of claims 1 to 6, wherein, The insulating layer includes a first portion and a second portion, the second portion being located outside the first portion, the first portion overlapping the first solid electrolyte layer, and the second portion extending beyond the first solid electrolyte layer.

8. The electrode assembly according to claim 7, wherein, The insulating layer facing the first electrode is flush with the surface of the second body facing the first electrode.

9. The electrode assembly according to any one of claims 1 to 8, wherein, The second electrode includes a second tab and a second active material layer. The second main body includes a second current collector. The second tab is connected to the second current collector. The second current collector is provided with the second active material layer. The second active material layer is provided with the edge thinning portion.

10. The electrode assembly according to claim 9, wherein, Along the thickness direction of the electrode assembly, the edge thinning portion does not penetrate the second active material layer.

11. The electrode assembly according to claim 9 or 10, wherein, The first electrode and the second electrode are located on the same side of the first main body; or, the first electrode and the second electrode are located on opposite sides of the first main body.

12. The electrode assembly according to any one of claims 1 to 11, wherein, The insulating layer does not extend beyond the edge of the second body portion.

13. The electrode assembly according to any one of claims 1 to 12, wherein, The first electrode is the positive electrode, and the second electrode is the negative electrode.

14. The electrode assembly according to any one of claims 1 to 13, wherein, The number of first electrode sheets is one, the number of second electrode sheets is two, and a first electrode sheet is disposed between the two second electrode sheets. The edge thinning portion is disposed on one side of the second main body. or, The number of first electrode sheets is two or more, the number of second electrode sheets is three or more, and the second electrode sheets and the first electrode sheets are arranged alternately. On the two outermost second electrode sheets, the edge thinning portion is provided on one side of the second main body. On the second electrode sheets located between adjacent first electrode sheets, the edge thinning portion is provided on both sides of the second main body.

15. A single battery cell, wherein, Includes the electrode assembly as described in any one of claims 1 to 14.

16. A battery device, wherein, Includes the battery cell as described in claim 15.

17. An electrical appliance, wherein, Includes the battery device as described in claim 16, the battery device being used to provide electrical energy.

18. A method for manufacturing an electrode assembly, wherein, include: A first electrode is provided, the first electrode comprising a first body portion and a first electrode tab; A first solid electrolyte layer is disposed on the first main body, and the first electrode and the first solid electrolyte layer form a first electrode assembly; A second electrode is provided, the second electrode including a second body portion, the area of ​​the second body portion being larger than the area of ​​the first body portion, the second body portion including an edge thinning portion extending circumferentially; An insulating layer is provided within the edge thinning portion, the insulating layer having a notch, and the insulating layer and the second electrode form a second electrode assembly; The first electrode assembly and the second electrode assembly are stacked, the first solid electrolyte layer is located between the first body portion and the second body portion, and the first electrode tab is provided corresponding to the notch.

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