Electrode assembly, battery cell, battery apparatus, electrical apparatus, and manufacturing method
By setting an insulating layer and designing a notch at the edge of the electrode, the problem of cracking or falling off of the solid electrolyte layer during the pressing process is solved, thereby improving the safety and electrical performance of the electrode assembly.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-04-24
- Publication Date
- 2026-06-18
AI Technical Summary
During the pressing process of the battery device, the edges of the solid electrolyte layer are prone to cracking or falling off, which may lead to short circuits or lithium plating between the electrodes, affecting the safety of the electrode assembly.
An insulating layer is set at the edge of the electrode sheet, and a notch is designed on the insulating layer to avoid the position of the electrode tab. This prevents the electrode tab from contacting the insulating layer after it is closed, reducing the possibility of uneven stress on the electrode sheet and improving the safety of the electrode assembly.
By designing the insulating layer, the possibility of the solid electrolyte layer cracking or falling off during the pressing process is reduced, the risk of short circuits between electrodes is reduced, and the safety and electrical performance of the electrode assembly are improved.
Smart Images
Figure CN2025090993_18062026_PF_FP_ABST
Abstract
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. 202411812980.5, filed on December 10, 2024, entitled “Electrode Assembly, Battery Cell, Battery Device, Electrical Device and Method of Manufacturing”, 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 second electrode, a solid electrolyte layer, and an insulating layer. The first electrode includes a first body portion and a first tab. 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 solid electrolyte layer is disposed on the second body portion. The solid electrolyte layer is located between the first body portion and the second body portion. An insulating layer is disposed at the edge of the solid electrolyte layer. The insulating layer faces the first electrode. 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 insulating layer is provided at the edge of the solid electrolyte layer. The insulating layer provides protection and support to the edge of the solid electrolyte layer, reducing the possibility of short circuits or lithium plating between the first and second main bodies due to cracking or detachment of the solid electrolyte layer during pressing. A notch is provided on the insulating layer, corresponding to the position of the first tab. After the first tab is closed, the notch can be used to avoid contact between the first tab and the insulating layer, preventing the insulating layer from raising the first tab in the thickness direction of the electrode assembly. This reduces the possibility of the insulating layer applying compressive stress to the closed first tab, leading to uneven stress on the first electrode and localized cracking, thus improving the safety of the electrode assembly.
[0008] In some feasible ways, the first electrode tab passes through the notch, with a portion of the first electrode tab located within the notch.
[0009] The first tab does not need to cross the insulating layer, so the insulating layer will not raise the first tab in the thickness direction of the electrode assembly. The first tab can reuse the space of the notch, reducing the space occupied by the first tab in the thickness direction of the electrode assembly.
[0010] In some feasible implementations, the first electrode includes an isolation portion, the first electrode tab is provided with the isolation portion, the isolation portion passes through a notch and extends beyond the insulating layer, and a portion of the isolation portion is located within the notch.
[0011] The isolation section provides protection for the first tab. It separates the first tab from the solid electrolyte layer, reducing the possibility of direct contact between the first tab and the solid electrolyte layer affecting the electrical performance of the electrode assembly. When the first tab is retracted, the isolation section also separates the first tab from the second body, reducing the possibility of a short circuit between the first tab and the second electrode plate caused by direct contact between them.
[0012] In some possible implementations, the first tab includes a first connecting segment and a second connecting segment connected together, the first connecting segment being connected to a first main body portion, a portion of the first connecting segment being located within a notch, the first connecting segment extending beyond the insulating layer, and the first connecting segment having an isolation portion.
[0013] The isolation section provides protection for the first connecting segment. It separates the first connecting segment from the solid electrolyte layer, reducing the possibility of the electrical performance of the electrode assembly being affected by direct contact between the solid electrolyte layer and the first connecting segment. When the first tab is retracted, the isolation section also separates the first connecting segment from the second main body, reducing the possibility of a short circuit between the first tab and the second electrode plate caused by direct contact between the first connecting segment and the second main body.
[0014] In some feasible embodiments, the first main body includes a first current collector and a first active material layer, the first current collector is provided with the first active material layer, the first connecting section is connected to the first current collector, and the thickness of the isolation part is less than or equal to the thickness of the first active material layer.
[0015] If the thickness of the insulating portion is greater than the thickness of the first active material layer, the insulating portion extends beyond the first active material layer along the thickness direction of the electrode assembly. The portion of the insulating portion located at the notch contacts the solid electrolyte layer, while the edge of the first active material layer near the insulating portion may not contact the solid electrolyte layer, affecting the electrical performance between the first active material layer and the solid electrolyte. Having the thickness of the insulating portion less than or equal to the thickness of the first active material layer can help reduce the likelihood of the aforementioned technical problems occurring.
[0016] In some feasible implementations, the isolation element includes at least one of a ceramic structure, an insulating tape, and a solid electrolyte structure.
[0017] In some feasible ways, the width of the notch is greater than or equal to the width of the first tab.
[0018] The gap in the insulation layer can avoid the first tab, and when the first electrode is stacked, a part of the first tab can enter the gap relatively easily, reducing the difficulty of positioning and matching the first tab with the gap.
[0019] In some feasible embodiments, the insulating layer protrudes from the solid electrolyte layer along the thickness direction of the electrode assembly, and the insulating layer surrounds the edge of the first body portion.
[0020] The insulating layer can protect the edges of the first main body. During the pressing process, the edges of the first main body are less prone to material cracking or falling off, reducing the possibility of a short circuit between the first and second main bodies caused by the falling off material.
[0021] In some feasible implementations, the thickness of the insulating layer protruding from the solid electrolyte layer is H0, and the thickness of the first main body is H1, where H0 = H1 / 2.
[0022] Along the thickness direction of the electrode assembly, a second electrode and a solid electrolyte layer can be respectively disposed on both sides of the first electrode. An insulating layer is disposed on each solid electrolyte layer. After the first electrode, second electrode, solid electrolyte layer and insulating layer are stacked, two adjacent insulating layers can contact each other, so that the two insulating layers surround and enclose the first main body, which helps to improve the protective and isolation effect of the insulating layers on the first main body.
[0023] In some feasible embodiments, the solid electrolyte layer includes an edge thinning portion, a portion of which is disposed within the edge thinning portion, and the edge thinning portion does not penetrate the solid electrolyte layer along the thickness direction of the electrode assembly.
[0024] The edge thinning portion of the solid electrolyte layer refers to the space formed after removing a portion of the material from the edge of the solid electrolyte layer. The thickness of the area in the edge thinning portion of the solid electrolyte layer can be less than the thickness of the area without an edge thinning portion. Part of the insulating layer is located within the edge thinning portion and partially protrudes from the solid electrolyte layer. The insulating layer provides circumferential protection for the solid electrolyte layer, helping to reduce the possibility of cracking or detachment during the pressing process.
[0025] In some feasible ways, the insulating layer does not extend beyond the edge of the solid electrolyte layer.
[0026] In the pressing process, an encapsulation film is used to encapsulate the stacked structure of the first electrode, solid electrolyte layer, second electrode, and insulating layer before pressing. Ensuring the insulating layer does not extend beyond the edge of the solid electrolyte layer helps reduce the possibility of mutual compression between the insulating layer and the encapsulation film.
[0027] In some feasible embodiments, the second electrode includes a second tab, the second main body includes a second current collector and a second active material layer, the second tab is connected to the second current collector, the second current collector is provided with the second active material layer, and a solid electrolyte layer is provided on the second active material layer.
[0028] 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.
[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, a first electrode is placed between the two second electrodes, and a solid electrolyte layer and an insulating layer are 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, a solid electrolyte layer and an insulating layer are provided on one side of the second main body. On the second electrodes located between adjacent first electrodes, a solid electrolyte layer and an insulating layer 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 second electrode is provided, wherein the first electrode has the opposite polarity to the second electrode, and the second electrode includes a second main body portion, the area of which is larger than the area of the first main body portion;
[0038] A solid electrolyte layer is provided on the second main body;
[0039] An insulating layer is disposed on a solid electrolyte, the insulating layer having a notch, and the second electrode, the solid electrolyte layer and the insulating layer form a composite structure.
[0040] The first electrode and the composite structure are stacked, with the solid electrolyte 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 partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;
[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 partial cross-sectional view of the first tab of an electrode assembly provided in an embodiment of this application during its retraction process.
[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 partial cross-sectional view 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 schematic diagram of the structure of an electrode assembly provided in an 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 partial cross-sectional view of an electrode assembly provided in an embodiment of this application;
[0061] Figure 20 is a schematic diagram of the manufacturing process of an electrode assembly provided in one embodiment of this application.
[0062] 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; 712. First active material layer; 72. First tab; 721. First connecting section; 722. Second connecting section; 73. Isolation section; 80. Second electrode; 81. Second main body section; 811. Second current collector; 812. Second active material layer; 82. Second tab; 90. Solid electrolyte layer; 91. Edge thinning section; 100. Insulating layer; 101. Notch; X: Length direction; Y: Width direction; Z: Thickness direction. Detailed Implementation
[0063] 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.
[0064] 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.
[0065] 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.
[0066] 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.
[0067] 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.
[0068] 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.
[0069] 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.
[0070] 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.
[0071] 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.
[0072] 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.
[0073] 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.
[0074] 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.
[0075] 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.
[0076] 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.
[0077] 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.
[0078] 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.
[0079] 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.
[0080] 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.
[0081] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.
[0082] 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.
[0083] 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.
[0084] 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.
[0085] 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.
[0086] 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.
[0087] 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.
[0088] 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.
[0089] 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.
[0090] 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.
[0091] 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.
[0092] 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.
[0093] 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.
[0094] 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.
[0095] 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.
[0096] 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.
[0097] 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.
[0098] 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.
[0099] 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.
[0100] Referring to Figures 5 to 9, this application provides an electrode assembly 60, which includes a first electrode 70, a second electrode 80, a solid electrolyte layer 90, and an insulating layer 100.
[0101] The first electrode 70 includes a first body portion 71 and a first tab 72. The first electrode 70 has the opposite polarity to the second electrode 80. The second electrode 80 includes a second body portion 81. The area of the second body portion 81 is larger than the area of the first body portion 71. A solid electrolyte layer 90 is disposed on the second body portion 81. The solid electrolyte layer 90 is located between the first body portion 71 and the second body portion 81. An insulating layer 100 is disposed at the edge of the solid electrolyte layer 90. The insulating layer 100 faces the first electrode 70. The insulating layer 100 has a notch 101. The first tab 72 is disposed corresponding to the notch 101.
[0102] In this embodiment, after the first electrode 70, the second electrode 80, and the solid electrolyte layer 90 are stacked and pressed, the first main body 71 and the second main body 81 can each be in contact with the solid electrolyte layer 90. The insulating layer 100 can support the edges of the solid electrolyte layer 90. The insulating layer 100 can be used to isolate the first main body 71 and the second main body 81, reducing the possibility of short circuits or lithium plating between the first main body 71 and the second main body 81 due to cracking or detachment of the edges of the solid electrolyte layer 90 during the pressing process.
[0103] The first tab 72 is positioned corresponding to the notch 101, meaning the lead-out position of the first tab 72 corresponds to the position of the notch 101. The areas of the first main body 71 and the second main body 81 are different. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the first main body 71 lies within the orthographic projection of the second main body 81. The thickness direction Z of the electrode assembly 60 refers to the stacking direction of the first main body 71, the solid electrolyte layer 90, and the second main body 81. A stepped structure is formed between the first main body 71 and the second main body 81. The second main body 81 has a portion extending beyond the first main body 71, and the root region of the first tab 72 extends across the portion of the second main body 81 that extends beyond the first main body 71 and is led out.
[0104] 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, the notch 101 of the insulating layer 100 can avoid the first tab 72, which helps to reduce the possibility that the insulating layer 100 will apply compressive stress to the first tab 72 due to contact between the first tab 72 and the insulating layer 100.
[0105] In the electrode assembly 60 of this application embodiment, an insulating layer 100 is provided at the edge of the solid electrolyte layer 90. The insulating layer 100 can protect and support the edge of the solid electrolyte layer 90, reducing the possibility of short circuit or lithium plating between the first main body 71 and the second main body 81 due to cracking or detachment of the solid electrolyte layer 90 during the pressing process. A notch 101 is provided on the insulating layer 100. The notch 101 corresponds to the position of the first tab 72. After the first tab 72 is closed, the notch 101 can be used to avoid the first tab 72, making it difficult for the first tab 72 to come into contact with the insulating layer 100. The insulating layer 100 will not raise the first tab 72 in the thickness direction Z of the electrode assembly 60, thereby reducing 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.
[0106] In some feasible implementations, the insulating layer 100 can be a non-closed annular structure. The insulating layer 100 can be discontinuous at the notch 101.
[0107] 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.
[0108] In some feasible implementations, referring to Figures 10 and 11, both the first main body 71 and the second main body 81 can be rectangular. The length of the first main body 71 is C2, and the length of the second main body 81 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 81 is L1, where L1 is greater than L2. In the length direction X, both ends of the second main body 81 extend beyond the first main body 71. In the width direction Y, both ends of the second main body 81 extend beyond the first main body 71.
[0109] In some feasible implementations, as shown in Figures 7 and 12, the first tab 72 passes through the notch 101. A portion of the first tab 72 is located within the notch 101. The notch 101 can serve as an exit space for the first tab 72. The first tab 72 does not need to cross the insulating layer 100, so that the insulating layer 100 does not elevate the first tab 72 in the thickness direction Z of the electrode assembly 60. The first tab 72 can reuse the space of the notch 101, reducing the space occupancy of the first tab 72 in the thickness direction Z of the electrode assembly 60.
[0110] In some possible implementations, as shown in Figures 7 and 12, the first electrode 70 includes an isolation portion 73. A first electrode tab 72 is disposed on the isolation portion 73. The isolation portion 73 extends through the notch 101 and beyond the insulating layer 100. A portion of the isolation portion 73 is located within the notch 101.
[0111] The isolation portion 73 can protect the first electrode tab 72. When the first electrode tab 72 is retracted, the first electrode tab 72 and the isolation portion 73 can deform simultaneously, for example, by bending. After the first electrode tab 72 is retracted, the isolation portion 73 can isolate the first electrode tab 72 from the solid electrolyte layer 90, reducing the possibility that the electrical performance of the electrode assembly 60 may be affected due to direct contact between the first electrode tab 72 and the solid electrolyte layer 90. After the first electrode tab 72 is retracted, the isolation portion 73 can also isolate the first electrode tab 72 from the second main body portion 81, reducing the possibility that a short circuit may occur between the first electrode tab 72 and the second electrode plate 80 due to direct contact between the first electrode tab 72 and the second main body portion 81.
[0112] In some possible implementations, referring to Figures 12 and 13, the first 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 81 beyond the first main body portion 71 and extends outwards. A portion of the first connecting segment 721 is located within the notch 101. The first connecting segment 721 extends beyond the insulating layer 100. An isolation portion 73 is provided on the first connecting segment 721. The isolation portion 73 extends beyond the insulating layer 100.
[0113] 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.
[0114] The isolation portion 73 can protect the first connecting segment 721. After the first tab 72 is retracted, the first connecting segment 721 and the isolation portion 73 can deform simultaneously, for example, by bending. After the first tab 72 is retracted, the isolation portion 73 can isolate the first connecting segment 721 and the solid electrolyte layer 90, reducing the possibility that the electrical performance of the electrode assembly 60 may be affected due to direct contact between the solid electrolyte layer 90 and the first connecting segment 721. After the first tab 72 is retracted, the isolation portion 73 can also isolate the first connecting segment 721 and the second main body 81, reducing the possibility that a short circuit may occur between the first tab 72 and the second electrode plate 80 due to direct contact between the first connecting segment 721 and the second main body 81.
[0115] 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.
[0116] In some examples, referring to Figures 10 and 11, both the first main body 71 and the second main body 81 are rectangular. The length of the first main body 71 is C2. The first tab 72 extends along the length direction X. The length of the second main body 81 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. The width of the first main body 71 is L2, and the width of the second main body 81 is L1, wherein L1 is greater than L2. In the width direction Y, the width of the first tab 72 is equal to the width of the insulating portion 73. In the width direction Y, the dimension of the insulating portion 73 is B.
[0117] In some possible implementations, referring to Figures 12 and 13, the first main body 71 includes a first current collector 711 and a first active material layer 712. The first current collector 711 is provided with the first active material layer 712. A first connecting segment 721 is connected to the first current collector 711. The thickness of the isolation portion 73 is less than or equal to the thickness of the first active material layer 712.
[0118] The thickness of the insulating portion 73 is equal to the thickness of the first active material layer 712, and the insulating portion 73 and the first active material layer 712 can be flush. Along the thickness direction Z of the electrode assembly 60, the notch 101 can penetrate the insulating layer 100. The portion of the insulating portion 73 located at the notch 101 and the first active material layer 712 are both in contact with the solid electrolyte layer 90.
[0119] The thickness of the isolation portion 73 is less than the thickness of the first active material layer 712, and there is a height difference between the isolation portion 73 and the first active material layer 712. The first active material layer 712 is in contact with the solid electrolyte layer 90. The portion of the isolation portion 73 located at the notch 101 may or may not be in contact with the solid electrolyte layer 90.
[0120] If the thickness of the insulating portion 73 is greater than the thickness of the first active material layer 712, the insulating portion 73 may extend beyond the first active material layer 712 along the thickness direction Z of the electrode assembly 60. The portion of the insulating portion 73 located at the notch 101 contacts the solid electrolyte layer 90, while there is a possibility that the edge of the first active material layer 712 near the insulating portion 73 may not contact the solid electrolyte layer 90, affecting the electrical performance between the first active material layer 712 and the solid electrolyte. Having the thickness of the insulating portion 73 less than or equal to the thickness of the first active material layer 712 can help reduce the likelihood of the aforementioned technical problems occurring.
[0121] In some examples, the isolation section 73 and the first active material layer 712 can be in contact with each other.
[0122] In some feasible ways, the isolation portion 73 may include, but is not limited to, at least one of a ceramic structure, an insulating tape, and a solid electrolyte structure.
[0123] In some examples, the materials of the ceramic structure include, but are not limited to, alumina. Exemplarily, a coating process is used to coat the first tab 72 with ceramic material to form the insulating portion 73.
[0124] The insulating tape is made of at least one of the following materials: polyethylene, polypropylene, polytetrafluoroethylene, and polyimide. The insulating tape can be adhered to the first tab 72.
[0125] The material of the solid electrolyte structure can be the same as that of the solid electrolyte layer 90, so that the same material can be used to form the isolation portion 73 and the solid electrolyte layer 90. When the isolation portion 73 and the solid electrolyte layer 90 come into contact at the notch 101, no chemical reaction will occur between them because they are made of the same material. In some examples, a coating process is used to coat the solid electrolyte material onto the first tab 72 to form the isolation portion 73.
[0126] In some examples, the width of the notch 101 is greater than or equal to the width of the first tab 72, so that the notch 101 of the insulating layer 100 can avoid the first tab 72, and when the first electrode 70 is stacked, a portion of the first tab 72 can relatively easily enter the notch 101, reducing the difficulty of positioning and matching the first tab 72 with the notch 101.
[0127] In some possible implementations, referring to Figures 7, 8, and 14, the insulating layer 100 protrudes beyond the solid electrolyte layer 90 along the thickness direction Z of the electrode assembly 60. The insulating layer 100 surrounds the edge of the first body portion 71. In some examples, at least a portion of the first body portion 71 may be located within the space defined by the insulating layer 100.
[0128] The insulating layer 100 can protect the edge of the first main body 71. During the pressing process, the edge of the first main body 71 is less likely to crack or fall off, reducing the possibility of a short circuit between the first main body 71 and the second main body 81 due to the detached material.
[0129] In some examples, the first body portion 71 includes a first active material layer 712. An insulating layer 100 is disposed around the edge of the first active material layer 712. During the pressing process, the edge of the first active material layer 712 is less prone to material cracking or detachment, reducing the possibility of a short circuit occurring between the first body portion 71 and the second body portion 81 due to detached active material.
[0130] In some examples, as shown in Figure 14, the insulating layer 100 protrudes from the solid electrolyte layer 90 with a thickness of H0, and the first main body portion 71 has a thickness of H1, where H0 = H1 / 2.
[0131] Along the thickness direction Z of the electrode assembly 60, a second electrode 80 and a solid electrolyte layer 90 can be respectively disposed on both sides of the first electrode 70. An insulating layer 100 is disposed on each solid electrolyte layer 90. After the first electrode 70, the second electrode 80, the solid electrolyte layer 90 and the insulating layer 100 are stacked, two adjacent insulating layers 100 can contact each other, so that the two insulating layers 100 surround and enclose the first main body 71, which helps to improve the protective and isolation effect of the insulating layer 100 on the first main body 71.
[0132] In some examples, the surface of the solid electrolyte layer 90 facing the first electrode 70 is flat, resulting in a uniform overall thickness and good surface flatness. An insulating layer 100 is disposed on the solid electrolyte layer 90. The thickness of the insulating layer 100 is the thickness H0 protruding from the solid electrolyte layer 90.
[0133] In some examples, referring to Figure 15, the solid electrolyte layer 90 includes an edge thinning portion 91. A portion of the insulating layer 100 is disposed within the edge thinning portion 91. The edge thinning portion 91 does not penetrate the solid electrolyte layer 90 along the thickness direction Z of the electrode assembly 60.
[0134] The edge thinning portion 91 of the solid electrolyte layer 90 refers to the space formed after removing part of the material from the edge of the solid electrolyte layer 90. The thickness of the solid electrolyte layer 90 in the area of the edge thinning portion 91 can be less than the thickness of the area where the edge thinning portion 91 is not provided. Part of the insulating layer 100 is located within the edge thinning portion 91 and partially protrudes from the solid electrolyte layer 90. The insulating layer 100 can provide circumferential protection for the solid electrolyte layer 90, which helps to reduce the possibility of cracking or falling off the solid electrolyte layer 90 during the pressing process.
[0135] In some feasible implementations, as shown in Figures 10 and 14, the insulating layer 100 does not extend beyond the edge of the solid electrolyte layer 90. In the pressing process, an encapsulation film is used to encapsulate the stacked structure of the first electrode 70, the solid electrolyte layer 90, the second electrode 80, and the insulating layer 100 before pressing. The arrangement where the insulating layer 100 does not extend beyond the edge of the solid electrolyte layer 90 helps reduce the possibility of mutual compression between the insulating layer 100 and the encapsulation film.
[0136] In some examples, referring to Figure 10, both the first main body portion 71 and the second main body portion 81 are rectangular. The length of the first main body portion 71 is C2, and the length of the second main body portion 81 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 81 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. The edge of the insulating layer 100 is flush with the edge of the solid electrolyte layer 90. 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.
[0137] In some possible implementations, referring to Figures 9 and 16, the second electrode 80 includes a second tab 82. The second body portion 81 includes a second current collector 811 and a second active material layer 812. The second tab 82 is connected to the second current collector 811. The second current collector 811 is disposed with the second active material layer 812. A solid electrolyte layer 90 is disposed on the second active material layer 812. The area of the solid electrolyte layer 90 may be equal to the area of the second active material layer 812.
[0138] In some examples, a coating process is used to coat a solid electrolyte material onto the second active material layer 812 to form a solid electrolyte layer 90. The coating process allows for precise control of the amount of solid electrolyte material coated, which helps to improve the thickness consistency and surface smoothness of the formed solid electrolyte layer 90.
[0139] In some possible implementations, referring to Figure 17, the first electrode 72 and the second electrode 82 can be located on the same side of the first main body 71. The first electrode 72 and the second electrode 82 extend from the same side. The first electrode 72 and the second electrode 82 are spaced apart.
[0140] In some possible implementations, the first electrode 72 and the second electrode 82 are located on opposite sides of the first main body 71. The first electrode 72 and the second electrode 82 extend from opposite sides respectively.
[0141] In some feasible implementations, the first electrode 70 can be a positive electrode. The materials of the first tab 72 and the first current collector 711 can be aluminum. The first active material layer 712 can include a positive electrode active material. The positive electrode active material can include lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.
[0142] The second electrode 80 can be a negative electrode. The materials of the second electrode tab 82 and the second current collector 811 can be copper. The second active material layer 812 includes a negative electrode active material. The negative electrode active material can include carbon or silicon, etc.
[0143] In some feasible implementations, as shown in Figures 17 and 18, there is one first electrode 70 and two second electrodes 80. A first electrode 70 is positioned between the two second electrodes 80. A solid electrolyte layer 90 and an insulating layer 100 are disposed on one side of the second main body 81, meaning that a solid electrolyte layer 90 and an insulating layer 100 are disposed on one side of each second electrode 80.
[0144] In some feasible implementations, as shown in Figure 19, the number of first electrode plates 70 is two or more. The number of second electrode plates 80 is three or more. The second electrode plates 80 and the first electrode plates 70 are arranged alternately. On the two outermost second electrode plates 80, a solid electrolyte layer 90 and an insulating layer 100 are provided on one side of the second main body portion 81, that is, the solid electrolyte layer 90 and the insulating layer 100 are provided on one side of the second electrode plate 80. On the second electrode plates 80 located between adjacent first electrode plates 70, a solid electrolyte layer 90 and an insulating layer 100 are provided on both sides of the second main body portion 81, that is, the solid electrolyte layer 90 and the insulating layer 100 are provided on both sides of the second electrode plate 80.
[0145] This application also provides a battery cell 30, which includes an electrode assembly 60 from any of the above embodiments.
[0146] This application also provides a battery device 10, including a battery cell 30 from any of the above embodiments.
[0147] 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.
[0148] Referring to Figure 20, this application embodiment also provides a method for manufacturing an electrode assembly 60, which includes:
[0149] A first electrode 70 is provided, the first electrode 70 including a first main body portion 71 and a first electrode tab 72;
[0150] A second electrode 80 is provided, the first electrode 70 and the second electrode 80 have opposite polarities, the second electrode 80 includes a second main body portion 81, the area of the second main body portion 81 is larger than the area of the first main body portion 71;
[0151] A solid electrolyte layer 90 is provided on the second main body 81;
[0152] An insulating layer 100 is disposed on a solid electrolyte, the insulating layer 100 having a notch 101, and the second electrode 80, the solid electrolyte layer 90 and the insulating layer 100 form a composite structure.
[0153] The first electrode 70 and the composite structure are stacked, the solid electrolyte is located between the first main body 71 and the second main body 81, and the first electrode tab 72 is provided corresponding to the notch 101.
[0154] 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; The second electrode has the opposite polarity to the first electrode and the second electrode includes a second main body portion, the area of which is larger than the area of the first main body portion; A solid electrolyte layer is disposed on the second main body portion, and the solid electrolyte layer is located between the first main body portion and the second main body portion; An insulating layer is disposed at the edge of the solid electrolyte layer, with the insulating layer facing the first electrode. The insulating layer has 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 passes through the notch, and a portion of the first electrode tab is located within the notch.
3. The electrode assembly according to claim 2, wherein, The first electrode includes an isolation portion, the first electrode tab is disposed on the isolation portion, the isolation portion passes through the notch and extends beyond the insulating layer, and a portion of the isolation portion is located within the notch.
4. The electrode assembly according to claim 3, wherein, 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 portion. A portion of the first connecting segment is located within the notch. The first connecting segment extends beyond the insulating layer and is provided with the isolation portion.
5. The electrode assembly according to claim 4, wherein, The first main body includes a first current collection section and a first active material layer. The first current collection section is provided with the first active material layer. The first connecting section is connected to the first current collection section. The thickness of the isolation section is less than or equal to the thickness of the first active material layer.
6. The electrode assembly according to any one of claims 3 to 5, wherein, The isolation component includes at least one of a ceramic structure, an insulating tape, and a solid electrolyte structure.
7. The electrode assembly according to any one of claims 1 to 6, wherein, The width of the notch is greater than or equal to the width of the first tab.
8. The electrode assembly according to any one of claims 1 to 7, wherein, Along the thickness direction of the electrode assembly, the insulating layer protrudes from the solid electrolyte layer and surrounds the edge of the first main body.
9. The electrode assembly according to claim 8, wherein, The thickness of the insulating layer protruding from the solid electrolyte layer is H0, and the thickness of the first main body is H1, wherein H0 = H1 / 2.
10. The electrode assembly according to claim 8 or 9, wherein, The solid electrolyte layer includes an edge thinning portion, and a portion of the insulating layer is disposed within the edge thinning portion. Along the thickness direction of the electrode assembly, the edge thinning portion does not penetrate the solid electrolyte layer.
11. The electrode assembly according to any one of claims 1 to 10, wherein, The insulating layer does not extend beyond the edge of the solid electrolyte layer.
12. The electrode assembly according to any one of claims 1 to 11, wherein, The second electrode includes a second tab, the second main body includes a second current collector and a second active material layer, the second tab is connected to the second current collector, the second current collector is disposed of the second active material layer, and the solid electrolyte layer is disposed on the second active material layer.
13. The electrode assembly according to claim 12, 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.
14. The electrode assembly according to any one of claims 1 to 13, wherein, The first electrode is the positive electrode, and the second electrode is the negative electrode.
15. The electrode assembly according to any one of claims 1 to 14, wherein, The number of first electrodes is one, the number of second electrodes is two, and a first electrode is disposed between the two second electrodes. The solid electrolyte layer and the insulating layer are disposed on one side of the second main body. or, The number of first electrodes is two or more, and the number of second electrodes is three or more. The second electrodes and the first electrodes are arranged alternately. On the two outermost second electrodes, the solid electrolyte layer and the insulating layer are provided on one side of the second main body. On the second electrodes located between adjacent first electrodes, the solid electrolyte layer and the insulating layer are respectively provided on both sides of the second main body.
16. A single battery cell, wherein, Includes the electrode assembly as described in any one of claims 1 to 15.
17. A battery device, wherein, Includes the battery cell as described in claim 16.
18. An electrical appliance, wherein, Includes the battery device as described in claim 17, the battery device being used to provide electrical energy.
19. 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 second electrode is provided, wherein the polarity of the first electrode is opposite to that of the second electrode, and the second electrode includes a second main body portion, the area of which is larger than the area of the first main body portion; A solid electrolyte layer is provided on the second main body; An insulating layer is disposed on the solid electrolyte, the insulating layer having a notch, and the second electrode, the solid electrolyte layer, and the insulating layer form a composite structure. The first electrode and the composite structure are stacked, the solid electrolyte is located between the first main body and the second main body, and the first electrode tab is provided corresponding to the notch.