Electrode assembly, battery cell, battery device, and electric device

Abstract

The application provides an electrode assembly, a battery monomer, a battery device and a power utilization device. The electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a solid electrolyte layer. The positive electrode sheet comprises a sheet body and an insulator. The sheet body comprises a positive electrode current collector and a positive electrode active material layer. The positive electrode current collector comprises an empty foil area beyond the positive electrode active material layer. The insulator comprises a first insulating part and a second insulating part. The first insulating part covers the outer side of the empty foil area. Two sides of the empty foil area are respectively provided with the second insulating part along the thickness direction of the electrode assembly. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer. The empty foil area is beyond the negative electrode current collector. The area of the positive electrode active material layer is greater than or smaller than the area of the negative electrode active material layer. The solid electrolyte layer is arranged between the positive electrode sheet and the negative electrode sheet. The area of the negative electrode active material layer is equal to the area of the solid electrolyte layer.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to an electrode assembly, a battery cell, a battery device, and an electrical device. Background Technology

[0002] 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

[0003] In view of the above problems, this application provides an electrode assembly, a battery cell, a battery device, and an electrical device, which helps to improve the safety of the battery device.

[0004] This application provides an electrode assembly, which includes a positive electrode, a negative electrode, and a solid electrolyte layer.

[0005] The positive electrode includes an electrode body and an insulator. The electrode body includes a positive current collector and a positive active material layer. The positive current collector includes an empty foil area extending beyond the positive active material layer. The insulator includes a first insulating portion and a second insulating portion. The first insulating portion covers the outer side of the empty foil area. Second insulating portions are respectively provided on both sides of the empty foil area along the thickness direction of the electrode assembly. The negative electrode includes a negative current collector and a negative active material layer. The empty foil area extends beyond the negative current collector. The area of ​​the positive active material layer is greater than or less than the area of ​​the negative active material layer. A solid electrolyte layer is disposed between the positive and negative electrode sheets. The area of ​​the negative active material layer is equal to that of the solid electrolyte layer.

[0006] In the electrode assembly of this application embodiment, an insulator is provided on the empty foil area of ​​the positive current collector. The first insulating part and the second insulating part of the insulator can protect and support the empty foil area, thereby reducing the possibility of short circuit between the positive and negative electrode plates due to warping or folding of the empty foil area under external extrusion pressure during the pressing process. At the same time, the first insulating part and the second insulating part can insulate and isolate the empty foil area from the negative current collector, reducing the possibility of the empty foil area directly contacting the negative current collector and causing a short circuit due to warping or folding of the empty foil area under external extrusion pressure. This is beneficial to improving the safety of the electrode assembly and the battery device.

[0007] In some feasible embodiments, the first insulating portion and the second insulating portion are each independently provided and connected to each other. Along the thickness direction of the electrode assembly, the thickness of the first insulating portion is greater than the thickness of the positive current collector, and the second insulating portion is provided between the first insulating portion and the positive active material layer.

[0008] Along the thickness direction of the electrode assembly, the first insulating portion extends beyond the positive current collector. A gap is formed between the first insulating portion and the positive active material layer. At least a portion of the second insulating portion is located within this gap. In a direction perpendicular to the thickness direction, the second insulating portion can be constrained by the first insulating portion and the positive active material layer, which helps to reduce the possibility of the second insulating portion shifting due to pressure during the pressing process.

[0009] The independent arrangement of the first and second insulating parts allows them to be matched relatively easily with the shape of the empty foil area, which helps to reduce the structural design and processing difficulty of the first and second insulating parts.

[0010] In some feasible implementations, the thickness of the first insulating portion is equal to the sum of the thickness of the positive current collector and the thickness of the positive active material layers on both sides of the positive current collector.

[0011] Along the thickness direction of the electrode assembly, the first insulating portion does not extend beyond the positive electrode active material layer, reducing the possibility that the first insulating portion will be raised due to its protrusion from the positive electrode active material layer, thereby reducing the possibility that the positive electrode active material layer will experience uneven pressure due to the raised first insulating portion.

[0012] In some feasible implementations, the first insulating part is a frame having a first receiving space, and both the electrode body and the second insulating part are located within the first receiving space.

[0013] The first insulating portion is arranged circumferentially around the positive current collector to increase the shielding area of ​​the empty foil area, thereby improving the protection, support, and insulation capabilities of the first insulating portion for the empty foil area. Along the thickness direction of the electrode assembly, the positive active material layer may not extend beyond the first insulating portion, and the entire empty foil area is located within the first accommodating space.

[0014] In some feasible ways, the second insulating portion does not extend beyond the positive electrode active material layer and the first insulating portion along the thickness direction of the electrode assembly.

[0015] Along the thickness direction of the electrode assembly, the second insulating portion does not extend beyond the positive electrode active material layer, reducing the possibility that the second insulating portion will be raised due to its protrusion from the positive electrode active material layer, thereby reducing the possibility that the positive electrode active material layer will experience uneven pressure due to the raised second insulating portion.

[0016] The second insulating portion does not extend beyond the positive electrode active material layer and the first insulating portion. The positive electrode active material layer and the first insulating portion can protect the second insulating portion, reducing the possibility that the second insulating portion may be scratched and peeled off from the empty foil area during the lamination process.

[0017] In some feasible ways, the thickness of the second insulating portion is equal to the thickness of the positive electrode active material layer.

[0018] In some feasible implementations, the empty foil region is an annular region surrounding the positive electrode active material layer, and the second insulating part is a frame with a second accommodating space, within which the positive electrode active material layer is located.

[0019] The second insulating portion can support the entire circumferential edge of the positive electrode active material layer. During the pressing process, the circumferential edge of the positive electrode active material layer can be constrained and supported by the second insulating portion, which helps to reduce the possibility of cracking or falling off the edge of the positive electrode active material layer.

[0020] In some feasible ways, the area of ​​the positive electrode active material layer is larger than the area of ​​the negative electrode active material layer, and the orthogonal projection of the negative electrode active material layer is located within the orthogonal projection of the second insulating part along the thickness direction of the electrode assembly.

[0021] In some feasible implementations, the area of ​​the positive electrode active material layer is smaller than that of the negative electrode active material layer, and a portion of the second insulating portion is located between the positive electrode current collector and the solid electrolyte layer. Along the thickness direction of the electrode assembly, the orthographic projection of the second insulating portion overlaps with the orthographic projection of the negative electrode active material layer.

[0022] Along the thickness direction of the electrode assembly, the solid electrolyte layer can support and limit the second insulating part, reducing the possibility of the second insulating part peeling off from the empty foil area due to the force applied to it, and improving the positional stability of the second insulating part.

[0023] In some feasible ways, the width of the second insulating portion is smaller than the width of the empty foil area.

[0024] The possibility of positional interference between the second insulating part and the first insulating part is not high, which helps to reduce the possibility that the second insulating part will squeeze the first insulating part and cause the first insulating part to peel off from the empty foil area.

[0025] In some feasible embodiments, there is a gap between the positive electrode active material layer and the second insulating portion, and the side of the second insulating portion facing away from the positive electrode active material layer is connected to the first insulating portion.

[0026] The first insulating part is connected to the second insulating part, forming an integral structure between them. This improves the overall load-bearing capacity of the insulator and its support for the empty foil area. The connection between the first and second insulating parts, and between the first insulating part and the empty foil area, results in a relatively large number of connection points for the first insulating part. This improves the connection stability of the first insulating part and makes it less prone to detachment.

[0027] In some feasible embodiments, the positive electrode active material layer is connected to the second insulating portion, and a portion of the first insulating portion extends to one side of the empty foil area and is connected to the side of the second insulating portion opposite to the positive electrode active material layer.

[0028] The positive electrode active material layer is in contact with the second insulating portion, allowing the first and second insulating portions to support the entire circumferential edge of the positive electrode active material layer. During the pressing process, the circumferential edge of the positive electrode active material layer is constrained and supported by the first and second insulating portions, which helps reduce the possibility of cracking or detachment of the positive electrode active material layer.

[0029] The first insulating part has a large connection area with the empty foil area, and the first insulating part is connected to the second insulating part, which helps to improve the connection stability of the first insulating part and makes it less likely for the first insulating part to fall off.

[0030] This application provides a battery cell that includes the electrode assembly described above.

[0031] This application provides a battery device that includes the aforementioned battery cell.

[0032] This application provides an electrical device including the battery device described above. The battery device is used to provide electrical energy. Attached Figure Description

[0033] 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:

[0034] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0035] Figure 2 This is a partially exploded structural diagram of a battery device provided in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0037] Figure 4 This is a partially exploded structural diagram of a battery cell provided in an embodiment of this application;

[0038] Figure 5 This is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0039] Figure 6 This is a partial structural schematic diagram of the electrode body provided in an embodiment of this application;

[0040] Figure 7 This is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0041] Figure 8 This is a partial cross-sectional view of the first insulating portion provided in an embodiment of this application;

[0042] Figure 9 This is a partial cross-sectional view of an insulator provided in an embodiment of this application;

[0043] Figure 10 This is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0044] Figure 11 This is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0045] Figure 12 This is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0046] Figure 13 This is a schematic diagram illustrating the manufacturing process of an electrode assembly provided in one embodiment of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Vehicle; 10. Battery assembly; 10a. Housing; 10b. First housing section; 10c. Second housing section;

[0049] 11. Controller; 12. Motor;

[0050] 20. Battery module;

[0051] 30. Battery cell;

[0052] 40. End cap; 41. Electrode terminal;

[0053] 50. Shell;

[0054] 60. Electrode assembly;

[0055] 70. Positive electrode sheet; 71. Electrode sheet body; 711. Positive electrode current collector; 711a. Empty foil region; 712. Positive electrode active material layer; 72. Insulator; 721. First insulating part; 7211. First accommodating space; 722. Second insulating part; 7221. Second accommodating space;

[0056] 80. Negative electrode sheet; 81. Negative electrode current collector; 82. Negative electrode active material layer;

[0057] 90. Solid electrolyte layer;

[0058] 100. Composite structure;

[0059] Z, thickness direction. Detailed Implementation

[0060] 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.

[0061] 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.

[0062] 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" and other indications of orientation or positional relationship are 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 are not intended to 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] A battery cell includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. The battery cell mainly relies on the movement of metal ions between the positive and negative electrode plates to function.

[0070] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector includes a positive electrode current collector section and a positive electrode tab connected to the current collector section. The current collector section is coated with the positive electrode active material layer. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum. The positive electrode active material layer includes the positive electrode active material. The positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0071] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode current collection section and a negative electrode tab connected to the negative electrode current collection section. The negative electrode current collection section is coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper. The negative electrode active material layer includes the negative electrode active material. The negative electrode active material can be carbon or silicon, etc.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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. For example, warm isostatic pressing (WIP) is used to press the stacked solid electrolyte layer and electrode. WIP involves high temperatures and high pressures. During pressing, compressive stress is applied along the thickness direction on both sides of the stacked solid electrolyte layer and electrode. However, the positive and negative electrode sheets, with opposite polarities, have different areas. The edge region of the larger positive electrode sheet extends beyond the smaller negative electrode sheet, forming an epitaxial portion. The edge region of the larger positive electrode sheet has an empty foil area. The empty foil area refers to the area on the positive current collector where no positive electrode active material is placed. During pressing, the empty foil area can warp and fold under external pressure, potentially connecting to the negative current collector and causing a short circuit between the positive and negative electrode sheets, affecting the safety of the electrode assembly.

[0076] To mitigate the problem of warping and folding of the empty foil area under external pressure during the pressing process, the empty foil area can be supported or insulated from the other electrode.

[0077] Based on the above considerations, to alleviate the problem of warping and folding of the empty foil area under external extrusion pressure during the pressing process, the inventors, after in-depth research, designed an electrode assembly. In this electrode assembly, an insulator is provided in the empty foil area of ​​the positive electrode. The insulator provides support for the empty foil area and isolates it from the other electrode, thereby reducing the possibility of short circuits between the positive and negative electrodes and improving the safety of the electrode assembly.

[0078] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0079] 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.

[0080] 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.

[0081] See Figure 1 As shown, 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.

[0082] 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.

[0083] 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.

[0084] See Figure 2 As shown, the battery device 10 includes a housing 10a and individual battery cells (not shown). The individual battery cells are housed within the housing 10a.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] In some embodiments, see Figure 3 As shown, there can be multiple battery cells 30. Multiple battery cells 30 are first connected in series, parallel, or in a mixed connection to form a battery module 20. Multiple battery modules 20 are then connected in series, parallel, or in a mixed connection to form a whole, which is housed in the casing 10a.

[0091] 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.

[0092] 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.

[0093] Battery cell 30 refers to the smallest unit that makes up battery device 10. See also Figure 4 As shown, the battery cell 30 includes an end cap 40, a housing 50, and an electrode assembly 60.

[0094] 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 electrode assembly 60 for outputting or inputting electrical energy into battery cell 30.

[0095] 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.

[0096] 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.

[0097] See Figure 5 , Figure 6 and Figure 7 As shown, this application provides an electrode assembly 60, which includes a positive electrode 70, a negative electrode 80, and a solid electrolyte layer 90.

[0098] The positive electrode 70 includes an electrode body 71 and an insulator 72. The electrode body 71 includes a positive current collector 711 and a positive active material layer 712. The positive current collector 711 includes an empty foil region 711a extending beyond the positive active material layer 712. The insulator 72 includes a first insulating portion 721 and a second insulating portion 722. The first insulating portion 721 covers the outer surface of the empty foil region 711a. Second insulating portions 722 are respectively provided on both sides of the empty foil region 711a along the thickness direction Z of the electrode assembly 60. The negative electrode 80 includes a negative current collector 81 and a negative active material layer 82. The empty foil region 711a extends beyond the negative current collector 81. The area of ​​the positive active material layer 712 is greater than or less than the area of ​​the negative active material layer 82. A solid electrolyte layer 90 is disposed between the positive electrode 70 and the negative electrode 80. The area of ​​the negative active material layer 82 is equal to the area of ​​the solid electrolyte layer 90.

[0099] The area of ​​the positive current collector 711 is different from the area of ​​the negative current collector 81. The area of ​​the positive active material layer 712 is different from the area of ​​the negative active material layer 82. The empty foil region 711a on the positive current collector 711 is located in the edge region. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the negative current collector 81 can lie within the orthographic projection of the positive current collector 711. The thickness direction Z of the electrode assembly 60 refers to the stacking direction of the positive electrode 70, the solid electrolyte layer 90, and the negative electrode 80.

[0100] The outer surface of the empty foil area 711a faces the first insulating portion 721. The first insulating portion 721 can cover and shield the outer surface of the empty foil area 711a, while the second insulating portions 722 on both sides of the empty foil area 711a along the thickness direction Z of the electrode assembly 60 can shield the empty foil area 711a.

[0101] In the electrode assembly 60 of this application embodiment, an insulator 72 is provided on the empty foil area 711a of the positive current collector 711. The first insulating portion 721 and the second insulating portion 722 of the insulator 72 can protect and support the empty foil area 711a, thereby reducing the possibility of a short circuit between the positive electrode 70 and the negative electrode 80 caused by warping or folding of the empty foil area 711a under external pressure during the pressing process. At the same time, the first insulating portion 721 and the second insulating portion 722 can insulate and isolate the empty foil area 711a from the negative current collector 81, reducing the possibility of the empty foil area 711a directly contacting the negative current collector 81 and causing a short circuit due to warping or folding of the empty foil area 711a under external pressure. This is beneficial to improving the safety of the electrode assembly 60 and the battery device 10.

[0102] During the processing of the positive electrode sheet 70, the positive current collector 711 can be processed by a cutting process. There is a possibility of debris residue remaining at the edge of the empty foil area 711a. The first insulating part 721 and the second insulating part 722 can block the debris in the empty foil area 711a, reducing the possibility of debris falling off and causing a short circuit between the positive current collector 711 and the negative current collector 81 through the debris.

[0103] In some feasible methods, the empty foil region 711a on the positive electrode 70 is formed by: providing a positive electrode 70, wherein a positive electrode active material layer 712 is coated on the positive electrode current collector 711 of the positive electrode 70. The positive electrode active material layer 712 completely covers the positive electrode current collector 711. A laser cleaning process is used to etch and clean the edge regions of the positive electrode active material layer 712 to remove some of the positive electrode active material, thereby exposing the edge regions of the positive electrode current collector 711 to form the empty foil region 711a.

[0104] Compared to the positive electrode active material layer 712, the negative electrode active material layer 82 has a relatively smaller thickness. If a laser cleaning process is used to etch and clean the edge area of ​​the negative electrode active material layer 82, there is a possibility that the laser will act on the negative electrode current collector 81 and etch it, which may result in the entire negative electrode sheet 80 being scrapped due to structural damage or thinning of the negative electrode current collector 81.

[0105] See also some of the possible implementation methods. Figure 7 As shown, the first insulating portion 721 and the second insulating portion 722 are each independently disposed and interconnected. Along the thickness direction Z of the electrode assembly 60, the thickness of the first insulating portion 721 is greater than the thickness of the positive electrode current collector 711. The second insulating portion 722 is disposed between the first insulating portion 721 and the positive electrode active material layer 712.

[0106] Along the thickness direction Z of the electrode assembly 60, the first insulating portion 721 extends beyond the positive electrode current collector 711. A gap is formed between the first insulating portion 721 and the positive electrode active material layer 712. At least a portion of the second insulating portion 722 is located within this gap. In a direction perpendicular to the thickness direction Z, the second insulating portion 722 can be constrained by the first insulating portion 721 and the positive electrode active material layer 712, which helps to reduce the possibility of the second insulating portion 722 shifting due to pressure during the pressing process.

[0107] The independent arrangement of the first insulating part 721 and the second insulating part 722 makes it relatively easy for the first insulating part 721 and the second insulating part 722 to match the shape of the empty foil area 711a, which helps to reduce the structural design and processing difficulty of the first insulating part 721 and the second insulating part 722.

[0108] In some examples, the connection method between the first insulating part 721 and the second insulating part 722 and the empty foil area 711a includes: firstly, connecting and fixing the second insulating part 722 to the empty foil area 711a, and then connecting the first insulating part 721 to the empty foil area 711a and the first insulating part 721 to the second insulating part 722.

[0109] In some examples, the connection method between the first insulating portion 721 and the second insulating portion 722 and the empty foil region 711a includes: firstly, the first insulating portion 721 is connected and fixed to the empty foil region 711a, forming a gap between the first insulating portion 721 and the positive electrode active material layer 712. This gap facilitates the positioning of the subsequently installed second insulating portion 722, enabling the second insulating portion 722 to be accurately positioned and reducing the difficulty of installing the second insulating portion 722. The second insulating portion 722 is then installed within this gap, connected to the empty foil region 711a and connected to the first insulating portion 721.

[0110] See also some of the possible implementation methods. Figure 7 As shown, the first insulating portion 721 is directly connected to the outer surface of the empty foil area 711a. There can be no gap between the first insulating portion 721 and the empty foil area 711a. This direct connection allows the first insulating portion 721 to form a single integral structure with the empty foil area 711a, facilitating direct support from the first insulating portion 721 and improving its support capacity. The empty foil area 711a provides a connection base for the first insulating portion 721, facilitating a stable connection between them. No additional connection structure is required between the first insulating portion 721 and the empty foil area 711a, reducing the number of connecting components.

[0111] In some examples, the first insulating portion 721 is bonded to the empty foil area 711a. The material of the first insulating portion 721 may include at least one of light-curing adhesive, hot melt adhesive, and tape.

[0112] For example, the material of the first insulating portion 721 may include a photocurable adhesive. After the photocurable adhesive is applied to the outside of the empty foil area 711a, it is irradiated with light (e.g., ultraviolet light) to cure the photocurable adhesive and form the first insulating portion 721.

[0113] For example, the material of the first insulating portion 721 may include hot melt adhesive. Molten hot melt adhesive is applied to the outer side of the empty foil area 711a. After the hot melt adhesive cools and solidifies, it forms the first insulating portion 721.

[0114] For example, the material of the first insulating portion 721 may include adhesive tape. Adhesive tape cut to a predetermined shape is directly pasted onto the empty foil area 711a to form the first insulating portion 721.

[0115] See also some of the possible implementation methods. Figure 7 As shown, the second insulating portion 722 is directly connected to the empty foil area 711a. There can be no gap between the second insulating portion 722 and the empty foil area 711a. This direct connection allows the second insulating portion 722 to form a single integral structure with the empty foil area 711a, facilitating direct support from the second insulating portion 722 and improving its support capacity. The empty foil area 711a provides a connection base for the second insulating portion 722, facilitating a stable connection between them. No additional connection structure is needed between the second insulating portion 722 and the empty foil area 711a, reducing the number of connecting components.

[0116] In some examples, the second insulating portion 722 is directly bonded to the empty foil area 711a, which helps to reduce the difficulty of connecting the second insulating portion 722 and the empty foil area 711a. The material of the second insulating portion 722 may include at least one of light-curing adhesive, hot melt adhesive, and tape.

[0117] For example, the material of the second insulating portion 722 may include a photocurable adhesive. After the photocurable adhesive is applied to the empty foil area 711a, it is irradiated with light (e.g., ultraviolet light) to cure the photocurable adhesive and form the second insulating portion 722.

[0118] For example, the material of the second insulating portion 722 may include hot melt adhesive. Molten hot melt adhesive is applied to the empty foil area 711a. After the hot melt adhesive cools and solidifies, it forms the second insulating portion 722.

[0119] For example, the material of the second insulating portion 722 may include adhesive tape. Adhesive tape cut to a predetermined shape is directly pasted onto the empty foil area 711a to form the second insulating portion 722.

[0120] In some feasible embodiments, the first insulating portion 721 is connected to the second insulating portion 722, so that the first insulating portion 721 and the second insulating portion 722 form an integral structure, which is beneficial to improving the overall load-bearing capacity of the insulator 72 and improving the support capacity of the insulator 72 for the empty foil area 711a.

[0121] See also some of the possible implementation methods. Figure 7 As shown, the thickness of the first insulating part 721 is equal to the sum of the thickness of the positive current collector 711 and the thickness of the positive active material layer 712 on both sides of the positive current collector 711.

[0122] Along the thickness direction Z of the electrode assembly 60, the first insulating portion 721 does not extend beyond the positive electrode active material layer 712, reducing the possibility that the first insulating portion 721 will be raised due to its protrusion from the positive electrode active material layer 712, thereby reducing the possibility that the positive electrode active material layer 712 will be subjected to uneven pressure due to the raised first insulating portion 721.

[0123] See also some of the possible implementation methods. Figure 7 and Figure 8 As shown, the first insulating portion 721 is a frame having a first receiving space 7211. The electrode body 71 and the second insulating portion 722 are both located within the first receiving space 7211.

[0124] The first insulating portion 721 is disposed circumferentially around the positive current collector 711 to increase the shielding area of ​​the empty foil region 711a, thereby improving the protective, supporting, and insulating capabilities of the first insulating portion 721 for the empty foil region 711a. Along the thickness direction Z of the electrode assembly 60, the positive active material layer 712 may not extend beyond the first insulating portion 721, and the empty foil region 711a is entirely located within the first accommodating space 7211.

[0125] In some examples, the empty foil region 711a can be an annular region surrounding the positive electrode active material layer 712. The first insulating portion 721 can be a closed annular frame or a non-closed annular frame.

[0126] In some feasible ways, along the thickness direction Z of the electrode assembly 60, the second insulating portion 722 does not extend beyond the positive electrode active material layer 712 and the first insulating portion 721.

[0127] Along the thickness direction Z of the electrode assembly 60, the second insulating portion 722 does not extend beyond the positive electrode active material layer 712, reducing the possibility that the second insulating portion 722 may be raised due to its protrusion from the positive electrode active material layer 712, thereby reducing the possibility that the positive electrode active material layer 712 may experience uneven pressure due to the raised second insulating portion 722.

[0128] The second insulating portion 722 does not extend beyond the positive electrode active material layer 712 and the first insulating portion 721. The positive electrode active material layer 712 and the first insulating portion 721 can protect the second insulating portion 722, reducing the possibility that the second insulating portion 722 may be scratched and peeled off from the empty foil area 711a during the stacking process.

[0129] In some examples, along the thickness direction Z of the electrode assembly 60, the thickness of the second insulating portion 722 is equal to the thickness of the positive electrode active material layer 712.

[0130] For example, along the thickness direction Z of the electrode assembly 60, the first insulating portion 721 and the second insulating portion 722 are flush.

[0131] See also some of the possible implementation methods. Figure 7 and Figure 9 As shown, the empty foil region 711a is an annular region surrounding the positive electrode active material layer 712, and the second insulating portion 722 is a frame having a second accommodating space 7221. The positive electrode active material layer 712 is located within the second accommodating space 7221.

[0132] The second insulating portion 722 can support the entire circumferential edge of the positive electrode active material layer 712. During the pressing process, the circumferential edge of the positive electrode active material layer 712 can be constrained and supported by the second insulating portion 722, which helps to reduce the possibility of cracking or falling off the edge of the positive electrode active material layer 712.

[0133] In some examples, the second insulating part 722 can be a closed annular frame or a non-closed annular frame.

[0134] See in some examples Figure 7 As shown, the area of ​​the positive electrode active material layer 712 is larger than the area of ​​the negative electrode active material layer 82. Along the thickness direction Z of the electrode assembly 60, the orthogonal projection of the negative electrode active material layer 82 lies within the orthogonal projection of the second insulating portion 722. The edge of the positive electrode active material layer 712 extends beyond the negative electrode active material layer 82. The edge of the positive electrode active material layer 712 extends beyond the solid electrolyte layer 90.

[0135] See in some examples Figure 10 As shown, the area of ​​the positive electrode active material layer 712 is smaller than the area of ​​the negative electrode active material layer 82. A portion of the second insulating portion 722 is located between the positive electrode current collector 711 and the solid electrolyte layer 90. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the second insulating portion 722 overlaps with the orthographic projection of the negative electrode active material layer 82.

[0136] Along the thickness direction Z of the electrode assembly 60, the solid electrolyte layer 90 can support and limit the second insulating part 722, reduce the possibility of the second insulating part 722 peeling off from the empty foil area 711a due to the force applied to it, and improve the positional stability of the second insulating part 722.

[0137] In some examples, along the thickness direction Z of the electrode assembly 60, the orthogonal projection of the positive electrode active material layer 712 lies within the orthogonal projection of the negative electrode active material layer 82.

[0138] In some examples, a portion of the second insulating portion 722 is located between the positive current collector 711 and the solid electrolyte layer 90, and a portion is located on the outside of the solid electrolyte layer 90.

[0139] See also some of the possible implementation methods. Figure 11 As shown, the width of the second insulating portion 722 is smaller than the width of the empty foil area 711a. The second insulating portion 722 and the first insulating portion 721 are less likely to experience positional interference, which helps reduce the possibility that the second insulating portion 722 might press against the first insulating portion 721, causing the first insulating portion 721 to peel off from the empty foil area 711a.

[0140] In some examples, the first insulating portion 721 is first connected to the empty foil area 711a. A gap is formed between the first insulating portion 721 and the positive electrode active material layer 712. Then, a second insulating portion 722 is disposed within the gap. Since the width of the second insulating portion 722 is smaller than the width of the empty foil area 711a, the second insulating portion 722 is less likely to compress the first insulating portion 721 during the disposal of the second insulating portion 722, thus reducing the possibility that the first insulating portion 721 may peel off from the empty foil area 711a due to compression from the second insulating portion 722.

[0141] In some examples, the second insulating portion 722 is first connected to the empty foil area 711a. Then, the first insulating portion 721 is provided on the outer periphery of the empty foil area 711a. Since the width of the second insulating portion 722 is smaller than the width of the empty foil area 711a, the second insulating portion 722 is less likely to compress the first insulating portion 721 during the provisioning of the first insulating portion 721, reducing the possibility that the first insulating portion 721 may peel off from the empty foil area 711a due to the second insulating portion 722 compressing the first insulating portion 721.

[0142] See in some examples Figure 11 As shown, there is a gap between the positive electrode active material layer 712 and the second insulating portion 722. The side of the second insulating portion 722 facing away from the positive electrode active material layer 712 is connected to the first insulating portion 721.

[0143] The first insulating part 721 is connected to the second insulating part 722, forming an integral structure between them. This improves the overall load-bearing capacity of the insulator 72 and enhances its support for the empty foil area 711a. The connection between the first insulating part 721 and the second insulating part 722, and between the first insulating part 721 and the empty foil area 711a, results in a relatively large number of connection points for the first insulating part 721. This improves the connection stability of the first insulating part 721 and makes it less prone to detachment.

[0144] See in some examples Figure 12As shown, the positive electrode active material layer 712 is connected to the second insulating portion 722. A portion of the first insulating portion 721 extends to one side of the empty foil region 711a and is connected to the side of the second insulating portion 722 opposite to the positive electrode active material layer 712.

[0145] The positive electrode active material layer 712 is in contact with the second insulating portion 722, so that the first insulating portion 721 and the second insulating portion 722 can support the entire circumferential edge of the positive electrode active material layer 712. During the pressing process, the circumferential edge of the positive electrode active material layer 712 can be constrained and supported by the first insulating portion 721 and the second insulating portion 722, which helps to reduce the possibility of cracking or falling off the edge of the positive electrode active material layer 712.

[0146] The first insulating part 721 has a large connection area with the empty foil area 711a, and the first insulating part 721 is connected to the second insulating part 722, which helps to improve the connection stability of the first insulating part 721 and makes the first insulating part 721 less likely to fall off.

[0147] See also some of the possible implementation methods. Figure 13 As shown, the manufacturing process of electrode assembly 60 includes:

[0148] <Making Positive Electrode Tablets 70>

[0149] Provides electrode body 71;

[0150] A second insulating portion 722 is provided on both sides of the empty foil area 711a;

[0151] A first insulating part 721 is provided along the circumference of the positive current collector 711.

[0152] <Fabrication of a composite structure 100 of negative electrode 80 and solid electrolyte layer 90>

[0153] Provide negative electrode plate 80;

[0154] A solid electrolyte layer 90 is provided, which is stacked with a negative electrode 80, and solid electrolyte layers are provided on both sides of the negative electrode 80.

[0155] The negative electrode 80 and the solid electrolyte layer 90 are pressed using a warm isostatic pressing process to form a composite structure 100.

[0156] <Making Electrode Components 60>

[0157] Place the bottom positive electrode plate 70;

[0158] A composite structure 100 is provided, consisting of a negative electrode 80 and a solid electrolyte layer 90, and the composite structure 100 is stacked with a positive electrode 70.

[0159] The positive electrode 70 and the composite structure 100 are alternately stacked;

[0160] The top positive electrode 70 is placed, and the positive electrode 70 and the composite structure 100 are stacked to form the component to be pressed;

[0161] The component to be pressed is pressed using a warm isostatic pressing process to form an electrode assembly 60.

[0162] In the manufacturing of the electrode assembly 60 in this application embodiment, the negative electrode 80 and the solid electrolyte layer 90 are pressed using a warm isostatic pressing process, which makes the connection between the negative electrode 80 and the solid electrolyte layer 90 stable, reduces the possibility that the solid electrolyte layer 90 will separate from the negative electrode 80 under its own gravity during the stacking process, reduces the stacking difficulty, and improves the stacking efficiency.

[0163] This application also provides a battery cell 30, which includes an electrode assembly 60 from any of the above embodiments.

[0164] This application also provides a battery device 10, including a battery cell 30 from any of the above embodiments.

[0165] 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.

[0166] 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, characterized in that, include: A positive electrode includes an electrode body and an insulator. The electrode body includes a positive current collector and a positive active material layer. The positive current collector includes an empty foil area extending beyond the positive active material layer. The insulator includes a first insulating portion and a second insulating portion. The first insulating portion covers the outer side of the empty foil area. The second insulating portion is provided on both sides of the empty foil area along the thickness direction of the electrode assembly. A negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, wherein the empty foil region extends beyond the negative electrode current collector, and the area of ​​the positive electrode active material layer is greater than or less than the area of ​​the negative electrode active material layer; A solid electrolyte layer is disposed between the positive electrode and the negative electrode, and the area of ​​the negative electrode active material layer is equal to that of the solid electrolyte layer.

2. The electrode assembly according to claim 1, characterized in that, The first insulating part and the second insulating part are each independently provided and connected to each other. Along the thickness direction of the electrode assembly, the thickness of the first insulating part is greater than the thickness of the positive current collector. The second insulating part is provided between the first insulating part and the positive active material layer.

3. The electrode assembly according to claim 2, characterized in that, The thickness of the first insulating portion is equal to the sum of the thickness of the positive current collector and the thickness of the positive active material layers on both sides of the positive current collector.

4. The electrode assembly according to claim 2 or 3, characterized in that, The first insulating part is a frame with a first accommodating space, and both the electrode body and the second insulating part are located within the first accommodating space.

5. The electrode assembly according to any one of claims 2 to 4, characterized in that, Along the thickness direction of the electrode assembly, the second insulating portion does not extend beyond the positive electrode active material layer and the first insulating portion.

6. The electrode assembly according to claim 5, characterized in that, The thickness of the second insulating portion is equal to the thickness of the positive electrode active material layer.

7. The electrode assembly according to any one of claims 4 to 6, characterized in that, The empty foil area is an annular region surrounding the positive electrode active material layer, and the second insulating part is a frame with a second accommodating space, in which the positive electrode active material layer is located.

8. The electrode assembly according to claim 7, characterized in that, The area of ​​the positive electrode active material layer is larger than the area of ​​the negative electrode active material layer, and along the thickness direction of the electrode assembly, the orthogonal projection of the negative electrode active material layer is located within the orthogonal projection of the second insulating portion.

9. The electrode assembly according to claim 7, characterized in that, The area of ​​the positive electrode active material layer is smaller than the area of ​​the negative electrode active material layer. A portion of the second insulating portion is located between the positive electrode current collector and the solid electrolyte layer. Along the thickness direction of the electrode assembly, the orthographic projection of the second insulating portion overlaps with the orthographic projection of the negative electrode active material layer.

10. The electrode assembly according to any one of claims 4 to 9, characterized in that, The width of the second insulating portion is smaller than the width of the empty foil area.

11. The electrode assembly according to claim 10, characterized in that, There is a gap between the positive electrode active material layer and the second insulating part, and the side of the second insulating part facing away from the positive electrode active material layer is connected to the first insulating part.

12. The electrode assembly according to claim 10, characterized in that, The positive electrode active material layer is connected to the second insulating portion, and a portion of the first insulating portion extends to one side of the empty foil area and is connected to the side of the second insulating portion opposite to the positive electrode active material layer.

13. A single battery cell, characterized in that, Includes the electrode assembly as described in any one of claims 1 to 12.

14. A battery device, characterized in that, Includes the battery cell as described in claim 13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

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