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

Abstract

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

Description

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

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411807410.7, filed on December 10, 2024, entitled “Electrode Assembly, Battery Cell, Battery Device, Electrical Device and Manufacturing Method”, the entire contents of which are incorporated herein by reference. Technical Field

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

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

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

[0006] This application provides an electrode assembly, which includes a first electrode, a first solid electrolyte layer, a second electrode, a second solid electrolyte layer, and an insulating layer.

[0007] The first electrode includes a first main body and a first electrode tab. A first solid electrolyte layer is disposed on the first main body.

[0008] The first electrode and the second electrode have opposite polarities. The second electrode includes a second main body portion. The area of ​​the second main body portion is larger than the area of ​​the first main body portion. A second solid electrolyte layer is disposed on the second main body portion. The second solid electrolyte layer is located between the first solid electrolyte layer and the second main body portion. The area of ​​the second solid electrolyte layer is larger than the area of ​​the first solid electrolyte layer. An insulating layer is disposed at the edge of the second solid electrolyte layer. The insulating layer faces the first electrode. The insulating layer has a notch. A first tab is disposed corresponding to the notch.

[0009] In the electrode assembly of this application embodiment, an insulating layer is provided at the edge of the second solid electrolyte layer. The area of ​​the second solid electrolyte layer is larger than the area of ​​the first solid electrolyte layer. The insulating layer can protect and support the edges of both the first and second solid electrolyte layers, reducing the possibility of short circuits or lithium plating between the first and second main bodies due to cracking or detachment of at least one of the first and second solid electrolyte layers during the pressing process. A notch is provided on the insulating layer. The notch corresponds to the position of the first electrode tab. After the first electrode tab is closed, the notch can be used to avoid contact between the first electrode tab and the insulating layer. The insulating layer does not raise the first electrode tab in the thickness direction of the electrode assembly, thereby reducing the possibility of uneven stress on the first electrode sheet caused by the insulating layer after folding, leading to local cracking, which is beneficial to improving the safety of the electrode assembly.

[0010] In some feasible ways, the first electrode tab passes through the notch, with a portion of the first electrode tab located within the notch.

[0011] The notch can serve as a lead-out space for the first tab. The first tab does not need to cross the insulating layer, preventing the insulating layer from raising the first tab in the thickness direction of the electrode assembly. The first tab can reuse the space of the notch, reducing its space occupancy in the thickness direction Z of the electrode assembly.

[0012] 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.

[0013] The insulating portion provides protection for the first electrode tab. When the first electrode tab is retracted, both the first electrode tab and the insulating portion can deform simultaneously, such as by bending. After the first electrode tab is retracted, the insulating portion isolates the first electrode tab from the second solid electrolyte layer, reducing the possibility of direct contact between the first electrode tab and the second solid electrolyte layer affecting the electrical performance of the electrode assembly. After the first electrode tab is retracted, the insulating portion also isolates the first electrode tab from the second main body, reducing the possibility of a short circuit between the first electrode tab and the second electrode plate caused by direct contact between the first electrode tab and the second main body.

[0014] 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, the first connecting segment extending beyond the insulating layer, and the first connecting segment having an isolation portion.

[0015] The isolation section provides protection for the first connecting segment. When the first tab is retracted, the first connecting segment and the isolation section can deform simultaneously, for example, by bending. After the first tab is retracted, the isolation section can separate the first connecting segment from the second solid electrolyte layer, reducing the possibility of the electrical performance of the electrode assembly being affected by direct contact between the second solid electrolyte layer and the first connecting segment. After the first tab is retracted, the isolation section can also separate 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.

[0016] In some feasible embodiments, the first electrode includes a first active material layer, the first main body includes a first current collector and a first active material layer, the first connecting section is connected to the first current collector, the first active material layer is disposed on both the first connecting section and the first current collector, and the first solid electrolyte layer and the isolation section are disposed on the first active material layer.

[0017] The first active material layer provided on the first connecting section can play a thickness compensation role, which is beneficial to reduce the height difference between the first solid electrolyte layer and the isolation part in the thickness direction of the electrode assembly.

[0018] In some feasible ways, the thickness of the isolation portion is less than or equal to the thickness of the first solid electrolyte layer.

[0019] If the thickness of the insulating portion is greater than the thickness of the first solid electrolyte layer, the insulating portion extends beyond the first solid electrolyte layer along the thickness direction of the electrode assembly. The portion of the insulating portion located at the notch contacts the second solid electrolyte layer and forms a raised area, potentially leading to a lack of contact between the edge of the first solid electrolyte layer near the insulating portion and the second solid electrolyte layer, affecting the electrical performance between the first and second solid electrolyte layers. Having an insulating portion thickness less than or equal to the thickness of the first solid electrolyte layer can help reduce the likelihood of the aforementioned technical problem.

[0020] In some feasible implementations, the isolation element includes at least one of a ceramic structure, an insulating tape, and a solid electrolyte structure.

[0021] In some feasible implementations, the isolation section includes a solid electrolyte structure, and the isolation section and the first solid electrolyte layer are integrally formed.

[0022] In the same processing step, the first solid electrolyte layer and the isolation part can be formed simultaneously using the same solid electrolyte material, which helps to reduce processing steps and reduce the processing difficulty of the isolation part.

[0023] In some feasible ways, the width of the notch is greater than or equal to the width of the first tab, so that the notch in the insulation layer can avoid the first tab and reduce the possibility of the insulation layer and the first tab coming into contact.

[0024] In some feasible embodiments, an insulating layer protrudes from the solid electrolyte layer along the thickness direction of the electrode assembly, the insulating layer having a receiving space, and a portion of the first solid electrolyte layer and the first main body portion being located within the receiving space.

[0025] The first main body and the first solid electrolyte layer can form a first electrode assembly. Along the thickness direction of the electrode assembly, the insulating layer can compensate for the height difference between the first electrode assembly and the second solid electrolyte layer. During the pressing process, the insulating layer can support the edge of the second solid electrolyte layer, reducing the possibility of crushing, cracking, or detachment of the edge of the second solid electrolyte layer.

[0026] The insulating layer can protect the edges of the first solid electrolyte layer and the first main body. During the pressing process, the edges of the first solid electrolyte layer and the first main body are less prone to material cracking or detachment, reducing the possibility that the electrical performance of the electrode assembly may be affected by cracking or detachment of the edges of the first solid electrolyte layer and the first main body.

[0027] In some feasible implementations, the thickness of the insulating layer protruding from the solid electrolyte layer is H0, the thickness of the first main body is H1, and the thickness of the first solid electrolyte layer is H2, where H0 = H1 / 2 + H2.

[0028] Along the thickness direction of the electrode assembly, a second electrode and a second solid electrolyte layer can be respectively disposed on both sides of the first electrode. An insulating layer is disposed on each second solid electrolyte layer. After the first electrode, the first solid electrolyte layer, the second electrode, the second solid electrolyte layer and the insulating layer are stacked, two adjacent insulating layers can contact each other, so that the two insulating layers surround and enclose the first solid electrolyte layer and the first main body, which helps to improve the protective and isolation effect of the insulating layer on the first solid electrolyte layer and the first main body.

[0029] In some feasible embodiments, the second 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 second solid electrolyte layer along the thickness direction of the electrode assembly.

[0030] Part of the insulating layer is located within the edge thinning portion, while a portion protrudes beyond the second solid electrolyte layer. The insulating layer can provide circumferential protection for the second solid electrolyte layer, which helps reduce the possibility of cracking or detachment of the second solid electrolyte layer during the pressing process.

[0031] In some feasible ways, the insulating layer does not extend beyond the edge of the second solid electrolyte layer.

[0032] In the pressing process, an encapsulation film is used to encapsulate the stacked structure of the first electrode, the first solid electrolyte layer, the second solid electrolyte layer, the second electrode, and the insulating layer before pressing. Ensuring that the insulating layer does not extend beyond the edge of the second solid electrolyte layer helps reduce the possibility of mutual compression between the insulating layer and the encapsulation film.

[0033] 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 disposed of the second active material layer, and a second solid electrolyte layer is disposed on the second active material layer.

[0034] 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.

[0035] In some feasible implementations, the first electrode is the positive electrode and the second electrode is the negative electrode.

[0036] In some feasible implementations, there is one first electrode, two second electrodes, a first electrode is disposed between the two second electrodes, and a second solid electrolyte layer and an insulating layer are disposed on one side of the second main body.

[0037] 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 second 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 second solid electrolyte layer and an insulating layer are provided on both sides of the second main body.

[0038] This application provides a battery cell that includes the electrode assembly described above.

[0039] This application provides a battery device comprising a battery cell as described above.

[0040] This application provides an electrical device including the battery device described above. The battery device is used to provide electrical energy.

[0041] This application provides a method for manufacturing an electrode assembly, which includes:

[0042] A first electrode plate is provided, comprising a first main body and a first electrode tab;

[0043] A first solid electrolyte is disposed on a first main body, and a first electrode and a first solid electrolyte layer form a first electrode assembly;

[0044] 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;

[0045] A second solid electrolyte layer is provided on the second main body, and the area of ​​the second solid electrolyte layer is larger than the area of ​​the first solid electrolyte layer.

[0046] An insulating layer is disposed on the second solid electrolyte, the insulating layer having a notch, and the second electrode, the second solid electrolyte layer and the insulating layer form a second electrode assembly;

[0047] The first electrode assembly and the second electrode assembly are stacked, and the second solid electrolyte layer is located between the first solid electrolyte layer and the second main body. The first electrode tab is provided with a corresponding notch. Attached Figure Description

[0048] 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:

[0049] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0050] Figure 2 is a partially exploded structural diagram of a battery device provided in an embodiment of this application;

[0051] Figure 3 is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0052] Figure 4 is a partial exploded view of a battery cell provided in an embodiment of this application;

[0053] Figure 5 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0054] Figure 6 is an enlarged schematic diagram of point M in Figure 5;

[0055] Figure 7 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0056] Figure 8 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0057] Figure 9 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0058] Figure 10 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0059] Figure 11 is a partial structural schematic diagram of an electrode assembly provided in an embodiment of this application;

[0060] Figure 12 is a partially exploded structural diagram of an electrode assembly provided in an embodiment of this application;

[0061] Figure 13 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.

[0062] Figure 14 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0063] Figure 15 is a partial cross-sectional view of an electrode assembly provided in one embodiment of this application;

[0064] Figure 16 is a partially exploded structural diagram of the second electrode provided in an embodiment of this application;

[0065] Figure 17 is a schematic diagram of the structure of an electrode assembly provided in an embodiment of this application;

[0066] Figure 18 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0067] Figure 19 is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0068] Figure 20 is a schematic diagram of the manufacturing process of an electrode assembly provided in one embodiment of this application.

[0069] 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; 701. First active material layer; 71. First main body section; 711. First current collector; 72. First tab; 721. First connecting section; 722. Second connecting section; 73. Isolation section; 80. First solid electrolyte layer; 90. Second electrode; 91. Second main body section; 911. Second current collector; 912. Second active material layer; 92. Second tab; 100. Second solid electrolyte layer; 101. Edge thinning section; 110. Insulating layer; 111. Notch; X. Length direction; Y. Width direction; Z. Thickness direction. Detailed Implementation

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] Referring to Figures 5 to 9, this application provides an electrode assembly 60, which includes a first electrode 70, a first solid electrolyte layer 80, a second electrode 90, and a second solid electrolyte layer 100.

[0108] The first electrode 70 includes a first body portion 71 and a first tab 72. A first solid electrolyte layer 80 is disposed on the first body portion 71. The first electrode 70 and the second electrode 90 have opposite polarities. The second electrode 90 includes a second body portion 91. The area of ​​the second body portion 91 is larger than the area of ​​the first body portion 71. A second solid electrolyte layer 100 is disposed on the second body portion 91. The second solid electrolyte layer 100 is located between the first solid electrolyte layer 80 and the second body portion 91. The area of ​​the second solid electrolyte layer 100 is larger than the area of ​​the first solid electrolyte layer 80. An insulating layer 110 is disposed at the edge of the second solid electrolyte layer 100. The insulating layer 110 faces the first electrode 70. The insulating layer 110 has a notch 111. The first tab 72 is disposed corresponding to the notch 111.

[0109] In this embodiment, after the first electrode 70, the first solid electrolyte layer 80, the second electrode 90, and the second solid electrolyte layer 100 are stacked and pressed, the first main body 71 is in contact with the first solid electrolyte layer 80, the first solid electrolyte layer 80 is in contact with the second solid electrolyte layer 100, and the second main body 91 is in contact with the second solid electrolyte layer 100. An insulating layer 110 is located on the side of the second solid electrolyte layer 100 facing the first electrode 70. The insulating layer 110 can support the edges of the first solid electrolyte layer 80 and the second solid electrolyte layer 100. The insulating layer 110 can isolate the first main body 71 and the second main body 91, reducing the possibility of a short circuit or lithium plating between the first main body 71 and the second main body 91 due to cracking or detachment of the edges of at least one of the first solid electrolyte layer 80 and the second solid electrolyte layer 100 during the pressing process.

[0110] The first tab 72 is positioned corresponding to the notch 111, meaning the lead-out position of the first tab 72 corresponds to the position of the notch 111. The areas of the first main body 71 and the second main body 91 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 91. The thickness direction Z of the electrode assembly 60 refers to the stacking direction of the first main body 71, the first solid electrolyte layer 80, the second solid electrolyte layer 100, and the second main body 91. A stepped structure is formed between the first main body 71 and the second main body 91. The second main body 91 has a portion extending beyond the first main body 71, and the root region of the first tab 72 extends across the portion of the second main body 91 that extends beyond the first main body 71 and is led out.

[0111] 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 111 of the insulating layer 110 can avoid the first tab 72, which helps to reduce the possibility that the insulating layer 110 will apply compressive stress to the first tab 72 due to contact between the first tab 72 and the insulating layer 110.

[0112] In the electrode assembly 60 of this application embodiment, an insulating layer 110 is provided at the edge of the second solid electrolyte layer 100. The area of ​​the second solid electrolyte layer 100 is larger than the area of ​​the first solid electrolyte layer 80. The insulating layer 110 can protect and support the edges of the first solid electrolyte layer 80 and the second solid electrolyte layer 100, reducing the possibility of a short circuit or lithium plating between the first main body portion 71 and the second main body portion 91 due to cracking or detachment of at least one of the first solid electrolyte layer 80 and the second solid electrolyte layer 100 during the pressing process. A notch 111 is provided on the insulating layer 110. The notch 111 corresponds to the position of the first electrode tab 72. After the first electrode tab 72 is closed, the notch 111 can be used to avoid the first electrode tab 72, making it difficult for the first electrode tab 72 to come into contact with the insulating layer 110. The insulating layer 110 does not raise the first tab 72 in the thickness direction Z of the electrode assembly 60, thereby reducing the possibility of uneven stress on the first electrode 70 caused by the insulating layer 110 after it is closed, which could lead to local cracking. This is beneficial to improving the safety of the electrode assembly 60. The way in which the first electrode 70 and the second electrode 90 of the electrode assembly 60 are simultaneously provided with the first solid electrolyte layer 80 and the second solid electrolyte layer 100 is beneficial to improving the electrical performance between the first electrode 70 and the second electrode 90.

[0113] In some feasible implementations, the insulating layer 110 can be a non-closed annular structure. The insulating layer 110 can be discontinuous at the notch 111.

[0114] In some feasible ways, the material of the insulating layer 110 may be one or more of polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber, including but not limited to polyethylene, polypropylene, polymethyl methacrylate, polyethylene terephthalate, and rubber.

[0115] In some feasible implementations, referring to Figures 10 and 11, both the first main body portion 71 and the second main body portion 91 can be rectangular. The length of the first main body portion 71 is C2, and the length of the second main body portion 91 is C1, where C1 is greater than C2. The width of the first main body portion 71 is L2, and the width of the second main body portion 91 is L1, where L1 is greater than L2. In the length direction X, both ends of the second main body portion 91 extend beyond the first main body portion 71, and both ends of the second solid electrolyte layer 100 extend beyond the first solid electrolyte layer 80. In the width direction Y, both ends of the second main body portion 91 extend beyond the first main body portion 71, and both ends of the second solid electrolyte layer 100 extend beyond the first solid electrolyte layer 80.

[0116] In some feasible implementations, as shown in Figures 7 and 12, the first tab 72 passes through the notch 111. A portion of the first tab 72 is located within the notch 111. The notch 111 can serve as an exit space for the first tab 72. The first tab 72 does not need to cross the insulating layer 110, so that the insulating layer 110 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 111, reducing the space occupancy of the first tab 72 in the thickness direction Z of the electrode assembly 60.

[0117] In some possible implementations, as shown in Figures 12 and 13, 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 111 and beyond the insulating layer 110. A portion of the isolation portion 73 is located within the notch 111.

[0118] 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 second solid electrolyte layer 100, 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 second solid electrolyte layer 100. 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 91, reducing the possibility that a short circuit may occur between the first electrode tab 72 and the second electrode plate 90 due to direct contact between the first electrode tab 72 and the second main body portion 91.

[0119] In some possible implementations, referring to FIG13, 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 91 beyond the first main body portion 71 and is extended outward. The first connecting segment 721 extends beyond the insulating layer 110. An isolation portion 73 is provided on the first connecting segment 721. The isolation portion 73 extends beyond the insulating layer 110.

[0120] 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.

[0121] 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 second solid electrolyte layer 100, reducing the possibility that the electrical performance of the electrode assembly 60 may be affected due to direct contact between the second solid electrolyte layer 100 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 91, reducing the possibility that a short circuit may occur between the first tab 72 and the second electrode 90 due to direct contact between the first connecting segment 721 and the second main body 91.

[0122] In some examples, a portion of the first connecting segment 721 is located within the notch 111. 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.

[0123] In some examples, referring to Figures 10 and 11, both the first main body 71 and the second main body 91 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 91 is C1. In the length direction X, the length of the first tab 72 is W1. In the length direction X, the dimension W of the insulating portion 73 is greater than (C1 - C2) / 2 and less than W1, so that the insulating portion 73 extends beyond the insulating layer 110. The width of the first main body 71 is L2, and the width of the second main body 91 is L1, wherein L1 is greater than L2. In the width direction Y, the width of the first tab 72 may be equal to the width of the insulating portion 73. In the width direction Y, the dimension of the insulating portion 73 is B.

[0124] In some possible implementations, as shown in Figures 12, 13, and 14, the first electrode 70 includes a first active material layer 701. The first main body 71 includes a first current collector 711 and the first active material layer 701. A first connecting segment 721 is connected to the first current collector 711. The first active material layer 701 is disposed on both the first connecting segment 721 and the first current collector 711. A first solid electrolyte layer 80 and an isolation portion 73 are both disposed on the first active material layer 701. The area of ​​the first solid electrolyte layer 80 may be equal to the area of ​​the first main body 71.

[0125] The first active material layer 701 provided on the first connecting section 721 can play a thickness compensation role, which is beneficial to reduce the height difference between the first solid electrolyte layer 80 and the isolation part 73 in the thickness direction Z of the electrode assembly 60.

[0126] In some examples, a coating process is used to coat a solid electrolyte material onto the first active material layer 701 to form a first solid electrolyte layer 80. 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 first solid electrolyte layer 80.

[0127] In some examples, a first active material layer 701 is provided on both sides of the first current collector 711 along the thickness direction Z of the electrode assembly 60.

[0128] In some examples, the thickness of the isolation portion 73 is less than or equal to the thickness of the first solid electrolyte layer 80.

[0129] The thickness of the isolation portion 73 is equal to the thickness of the first solid electrolyte layer 80, and the isolation portion 73 and the first solid electrolyte layer 80 can be flush. Along the thickness direction Z of the electrode assembly 60, the notch 111 can penetrate the insulating layer 110. The portion of the isolation portion 73 located at the notch 111 and the first solid electrolyte layer 80 are in contact with the second solid electrolyte layer 100.

[0130] The thickness of the insulating portion 73 is less than the thickness of the first solid electrolyte layer 80. Along the thickness direction Z of the electrode assembly 60, the insulating portion 73 is lower than the first solid electrolyte layer 80. There is a height difference between the insulating portion 73 and the first solid electrolyte layer 80. The insulating portion 73 is less likely to create a raised area in the thickness direction Z of the electrode assembly 60, which is beneficial for the first solid electrolyte layer 80 and the second solid electrolyte layer 100 to maintain good contact.

[0131] If the thickness of the insulating portion 73 is greater than the thickness of the first solid electrolyte layer 80, the insulating portion 73 extends beyond the first solid electrolyte layer 80 along the thickness direction Z of the electrode assembly 60. The portion of the insulating portion 73 located at the notch 111 contacts the second solid electrolyte layer 100 and forms a raised area, potentially causing a lack of contact between the edge of the first solid electrolyte layer 80 near the insulating portion 73 and the second solid electrolyte layer 100, affecting the electrical performance between the first solid electrolyte layer 80 and the second solid electrolyte. Having the thickness of the insulating portion 73 less than or equal to the thickness of the first solid electrolyte layer 80 can help reduce the likelihood of the aforementioned technical problem occurring.

[0132] 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.

[0133] In some examples, the materials of the ceramic structure include, but are not limited to, alumina. Exemplarily, a ceramic material is coated onto the first tab 72 or the first active material layer 701 using a coating process to form an isolation portion 73.

[0134] 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 or the first active material layer 701.

[0135] The materials of the solid electrolyte structure, the first solid electrolyte layer 80, and the second solid electrolyte layer 100 can be the same, so that the isolation portion 73, the first solid electrolyte layer 80, and the second solid electrolyte layer 100 can be formed using the same materials. When the isolation portion 73 and the second solid electrolyte layer 100 come into contact at the notch 111, no chemical reaction will occur between them because the isolation portion 73 and the second solid electrolyte layer 100 are made of the same material.

[0136] In some examples, a coating process is used to coat the solid electrolyte material onto the first tab 72 or the first active material layer 701 to form an isolation portion 73.

[0137] In some examples, the isolation portion 73 includes a solid electrolyte structure. The isolation portion 73 and the first solid electrolyte layer 80 are integrally formed. In the same processing step, the first solid electrolyte layer 80 and the isolation portion 73 can be formed simultaneously using the same solid electrolyte material, which helps to reduce processing steps and lower the processing difficulty of the isolation portion 73. In some examples, a coating process is used to coat the solid electrolyte material onto the first active material layer 701 to form the first solid electrolyte layer 80 and the isolation portion 73.

[0138] In some examples, the width of the notch 111 is greater than or equal to the width of the first tab 72, so that the notch 111 of the insulating layer 110 can avoid the first tab 72, reducing the possibility of contact between the insulating layer 110 and the first tab 72. For example, when the first electrode 70 is stacked, a portion of the first tab 72 can relatively easily enter the notch 111, reducing the difficulty of positioning and matching the first tab 72 with the notch 111.

[0139] In some feasible embodiments, the insulating layer 110 protrudes from the second solid electrolyte layer 100 along the thickness direction Z of the electrode assembly 60. A height difference exists between the insulating layer 110 and the second solid electrolyte layer 100 along the thickness direction Z of the electrode assembly 60. The insulating layer 110 has a receiving space. A portion of the first solid electrolyte layer 80 and the first body portion 71 are located within the receiving space. The insulating layer 110 surrounds the first solid electrolyte layer 80 and the first body portion 71.

[0140] The first main body 71 and the first solid electrolyte layer 80 can form a first electrode 70 assembly. Along the thickness direction Z of the electrode assembly 60, the insulating layer 110 can compensate for the height difference between the first electrode 70 assembly and the second solid electrolyte layer 100. During the pressing process, the insulating layer 110 can support the edge of the second solid electrolyte layer 100, reducing the possibility of crushing, cracking, or detachment of the edge of the second solid electrolyte layer 100.

[0141] The insulating layer 110 can protect the edges of the first solid electrolyte layer 80 and the first main body 71. During the pressing process, the edges of the first solid electrolyte layer 80 and the first main body 71 are less prone to material cracking or falling off, reducing the possibility that the electrical performance of the electrode assembly 60 will be affected by cracking or falling off of the edges of the first solid electrolyte layer 80 and the first main body 71.

[0142] In some examples, as shown in Figure 14, the thickness of the insulating layer 110 protruding from the solid electrolyte layer is H0, the thickness of the first main body 71 is H1, and the thickness of the first solid electrolyte layer 80 is H2, where H0 = H1 / 2 + H2.

[0143] Along the thickness direction Z of the electrode assembly 60, a second electrode 90 and a second solid electrolyte layer 100 can be respectively disposed on both sides of the first electrode 70. An insulating layer 110 is disposed on each of the second solid electrolyte layers 100. After the first electrode 70, the first solid electrolyte layer 80, the second electrode 90, the second solid electrolyte layer 100 and the insulating layer 110 are stacked, two adjacent insulating layers 110 can contact each other, so that the two insulating layers 110 surround and enclose the first solid electrolyte layer 80 and the first main body 71, which helps to improve the protective and isolation effect of the insulating layer 110 on the first solid electrolyte layer 80 and the first main body 71.

[0144] In some examples, the surface of the second solid electrolyte layer 100 facing the first electrode 70 is flat, resulting in a uniform overall thickness and good surface flatness. An insulating layer 110 is disposed on the second solid electrolyte layer 100. The thickness of the insulating layer 110 is the thickness H0 protruding from the second solid electrolyte layer 100.

[0145] In some examples, referring to FIG15, the second solid electrolyte layer 100 includes an edge thinning portion 101. A portion of the insulating layer 110 is disposed within the edge thinning portion 101. The edge thinning portion 101 does not penetrate the second solid electrolyte layer 100 along the thickness direction Z of the electrode assembly 60.

[0146] The edge thinning portion 101 of the second solid electrolyte layer 100 refers to the space formed after removing a portion of the material from the edge of the second solid electrolyte layer 100. The thickness of the second solid electrolyte layer 100 in the region of the edge thinning portion 101 can be less than the thickness of the region where the edge thinning portion 101 is not provided. Part of the insulating layer 110 is located within the edge thinning portion 101 and partially protrudes from the second solid electrolyte layer 100. The insulating layer 110 can provide circumferential protection for the second solid electrolyte layer 100, which helps to reduce the possibility of cracking or detachment of the second solid electrolyte layer 100 during the pressing process.

[0147] In some feasible implementations, the insulating layer 110 does not extend beyond the edge of the second solid electrolyte layer 100. In the pressing process, an encapsulation film is used to encapsulate the stacked structure of the first electrode 70, the first solid electrolyte layer 80, the second solid electrolyte layer 100, the second electrode 90, and the insulating layer 110 before pressing. The arrangement that the insulating layer 110 does not extend beyond the edge of the second solid electrolyte layer 100 helps reduce the possibility of mutual compression between the insulating layer 110 and the encapsulation film.

[0148] In some examples, referring to Figures 10 and 11, both the first main body portion 71 and the second main body portion 91 are rectangular. The length of the first main body portion 71 is C2, and the length of the second main body portion 91 is C1, where C1 is greater than C2. The width of the first main body portion 71 is L2, and the width of the second main body portion 91 is L1, where L1 is greater than L2. Exemplarily, the width of the insulating layer 110 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 110 is flush with the edge of the second solid electrolyte layer 100. 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 110.

[0149] In some possible implementations, referring to Figure 16, the second electrode 90 includes a second tab 92. The second main body 91 includes a second current collector 911 and a second active material layer 912. The second tab 92 is connected to the second current collector 911. The second current collector 911 is disposed with the second active material layer 912. A second solid electrolyte layer 100 is disposed on the second active material layer 912. The area of ​​the second solid electrolyte layer 100 may be equal to the area of ​​the second active material layer 912.

[0150] In some examples, a coating process is used to coat a solid electrolyte material onto the second active material layer 912 to form a second solid electrolyte layer 100. 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 second solid electrolyte layer 100.

[0151] In some examples, the material of the first solid electrolyte layer 80 is the same as that of the second solid electrolyte layer 100.

[0152] In some possible implementations, referring to Figure 17, the first electrode 72 and the second electrode 92 can be located on the same side of the first main body 71. The first electrode 72 and the second electrode 92 extend from the same side. The first electrode 72 and the second electrode 92 are spaced apart.

[0153] In some possible implementations, the first electrode 72 and the second electrode 92 are located on opposite sides of the first main body 71. The first electrode 72 and the second electrode 92 extend from opposite sides respectively.

[0154] 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 701 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.

[0155] The second electrode 90 can be a negative electrode. The materials of the second electrode tab 92 and the second current collector 911 can be copper. The second active material layer 912 includes a negative electrode active material. The negative electrode active material can include carbon or silicon, etc.

[0156] In some possible implementations, as shown in Figures 17 and 18, there is one first electrode 70 and two second electrodes 90. A first electrode 70 is positioned between the two second electrodes 90. A second solid electrolyte layer 100 and an insulating layer 110 are disposed on one side of the second main body 91, that is, the second solid electrolyte layer 100 and the insulating layer 110 are disposed on one side of the second electrode 90.

[0157] 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 90 is three or more. The second electrode plates 90 and the first electrode plates 70 are arranged alternately. On the two outermost second electrode plates 90, a second solid electrolyte layer 100 and an insulating layer 110 are provided on one side of the second main body portion 91, that is, the second solid electrolyte layer 100 and the insulating layer 110 are provided on one side of the second electrode plate 90. On the second electrode plates 90 located between adjacent first electrode plates 70, the second solid electrolyte layer 100 and the insulating layer 110 are respectively provided on both sides of the second main body portion 91, that is, the second solid electrolyte layer 100 and the insulating layer 110 are provided on both sides of the second electrode plate 90.

[0158] This application also provides a battery cell 30, which includes an electrode assembly 60 from any of the above embodiments.

[0159] This application also provides a battery device 10, including a battery cell 30 from any of the above embodiments.

[0160] 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.

[0161] Referring to Figure 20, this application embodiment also provides a method for manufacturing an electrode assembly 60, which includes:

[0162] A first electrode plate 70 is provided, including a first main body portion 71 and a first electrode tab 72;

[0163] A first solid electrolyte is disposed on the first main body 71, and a first electrode 70 and a first solid electrolyte layer 80 form a first electrode 70 assembly;

[0164] A second electrode 90 is provided, the first electrode 70 and the second electrode 90 have opposite polarities, the second electrode 90 includes a second main body portion 91, the area of ​​the second main body portion 91 is larger than the area of ​​the first main body portion 71;

[0165] A second solid electrolyte layer 100 is provided on the second main body 91, and the area of ​​the second solid electrolyte layer 100 is larger than the area of ​​the first solid electrolyte layer 80.

[0166] An insulating layer 110 is disposed on the second solid electrolyte, the insulating layer 110 having a notch 111, and the second electrode 90, the second solid electrolyte layer 100 and the insulating layer 110 form a second electrode 90 assembly;

[0167] The first electrode 70 assembly and the second electrode 90 assembly are stacked, the second solid electrolyte layer 100 is located between the first solid electrolyte layer 80 and the second main body 91, and the first tab 72 is provided with a corresponding notch 111.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electrode assembly, wherein, include: The first electrode plate includes a first main body and a first electrode tab; A first solid electrolyte layer is disposed on the first main body portion; The second electrode has the opposite polarity to the first electrode 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 second solid electrolyte layer is disposed on the second main body portion. The second solid electrolyte layer is located between the first solid electrolyte layer and the second main body portion. The area of ​​the second solid electrolyte layer is larger than the area of ​​the first solid electrolyte layer. An insulating layer is disposed at the edge of the second solid electrolyte layer, the insulating layer facing the first electrode, the insulating layer having a notch, and the first electrode tab being 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 1 or 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 and extends beyond the insulating layer. The first connecting segment is provided with the isolation portion.

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

6. The electrode assembly according to claim 5, wherein, The thickness of the isolation portion is less than or equal to the thickness of the first solid electrolyte layer.

7. The electrode assembly according to any one of claims 3 to 6, wherein, The isolation component includes at least one of a ceramic structure, an insulating tape, and a solid electrolyte structure.

8. The electrode assembly according to any one of claims 3 to 6, wherein, The isolation section includes a solid electrolyte structure, and the isolation section and the first solid electrolyte layer are integrally formed.

9. The electrode assembly according to any one of claims 1 to 8, wherein, The width of the notch is greater than or equal to the width of the first tab.

10. The electrode assembly according to any one of claims 1 to 9, wherein, Along the thickness direction of the electrode assembly, the insulating layer protrudes from the solid electrolyte layer and has a receiving space, within which the first solid electrolyte layer and a portion of the first main body are located.

11. The electrode assembly of claim 10, wherein, The thickness of the insulating layer protruding from the solid electrolyte layer is H0, the thickness of the first main body is H1, and the thickness of the first solid electrolyte layer is H2, wherein H0 = H1 / 2 + H2.

12. The electrode assembly according to claim 10 or 11, wherein, The second 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 second solid electrolyte layer.

13. The electrode assembly according to any one of claims 1 to 12, wherein, The insulating layer does not extend beyond the edge of the second solid electrolyte layer.

14. The electrode assembly according to any one of claims 1 to 13, wherein, The second electrode includes a second tab, and 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 second solid electrolyte layer is disposed on the second active material layer.

15. The electrode assembly of claim 14, 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.

16. The electrode assembly according to any one of claims 1 to 15, wherein, The first electrode is the positive electrode, and the second electrode is the negative electrode.

17. The electrode assembly according to any one of claims 1 to 16, 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. A second 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 second 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 second solid electrolyte layer and the insulating layer are respectively provided on both sides of the second main body.

18. A single battery cell, wherein, Includes the electrode assembly as described in any one of claims 1 to 17.

19. A battery device, wherein, Includes the battery cell as described in claim 18.

20. An electrical appliance, wherein, Includes the battery device as described in claim 19, the battery device being used to provide electrical energy.

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

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