Electrode assembly, battery cell, battery device, and electric device
Patent Information
- Application Number
- CN202510525337.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2026-10-27
Smart Images
Figure CN122991973A_ABST
Abstract
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 first composite structural member.
[0005] The first composite structural component includes a first electrode, a second electrode, an insulating component, and a solid electrolyte layer.
[0006] The first electrode includes a first main body portion. The first electrode and the second electrode have opposite polarities. The second electrode includes a second main body portion. The area of the first main body portion is smaller than the area of the second main body portion. The second main body portion includes an extension portion extending beyond the first main body portion. The insulating member is an integrally formed structure. The insulating member includes a first insulating portion and a second insulating portion. Along the thickness direction of the electrode assembly, the first insulating portion is disposed on the side of the extension portion facing the first main body portion. The first insulating portion covers the outer surface of the first main body portion. The second insulating portion covers the outer surface of the second main body portion. Along the thickness direction of the electrode assembly, the orthographic projection of the first insulating portion does not overlap with the orthographic projection of the first main body portion, and the orthographic projection of the second insulating portion does not overlap with the orthographic projection of the second main body portion. Along the thickness direction of the electrode assembly, the first main body portion, the solid electrolyte layer, and the second main body portion are stacked.
[0007] In the electrode assembly of this application embodiment, an integrally formed insulating member is provided on the outer extension portion of the second main body. The first and second insulating portions of the insulating member can protect and support the outer extension portion, thereby reducing the possibility of a short circuit between the first and second electrodes caused by warping or folding of the outer extension portion under external extrusion pressure during the pressing process. At the same time, the first and second insulating portions can insulate and isolate the outer extension portion from the first electrode, reducing the possibility of the outer extension portion directly contacting the first electrode and causing a short circuit due to warping or folding of the outer extension portion under external extrusion pressure. This is beneficial to improving the safety of the electrode assembly and the battery device.
[0008] In some feasible embodiments, the first insulating portion is a frame having a first receiving hole, and the first main body portion is located within the first receiving hole along the thickness direction of the electrode assembly.
[0009] The first insulating part extends circumferentially along the first main body to increase the shielding area of the first insulating part on the first main body, thereby improving the protective, supporting and insulating isolation capabilities of the first insulating part on the first main body.
[0010] In some feasible embodiments, the second insulating portion is a frame having a second receiving hole, and the second main body portion is located within the second receiving hole along the thickness direction of the electrode assembly.
[0011] The second insulating part extends circumferentially along the second main body to increase the shielding area of the second insulating part on the second main body, thereby improving the protective, supporting and insulating isolation capabilities of the second insulating part on the second main body.
[0012] In some feasible ways, a solid electrolyte layer is disposed in at least one of the first receiving hole and the second receiving hole.
[0013] Depending on the design requirements of the electrode assembly, the arrangement of the solid electrolyte layer can be selected to ensure that the electrode assembly maintains good electrochemical performance.
[0014] In some feasible embodiments, solid electrolyte layers are respectively provided on both sides of the second main body along the thickness direction of the electrode assembly. The area of the solid electrolyte layer is larger than the area of the first main body. The solid electrolyte layer is located in the second receiving hole and covers at least part of the outer extension. Along the thickness direction of the electrode assembly, the orthographic projection of the first insulating portion and the orthographic projection of the solid electrolyte layer have an overlapping area.
[0015] Both the insulating component and the solid electrolyte layer provide protection and support for the epitaxial portion, enhancing its support capacity and resistance to compression. This reduces the likelihood of short circuits between the first and second electrodes caused by warping or folding of the epitaxial portion under external compressive force during pressing. The insulating component also provides protection and isolation for the solid electrolyte layer, reducing the possibility of cracking or detachment at the edges of the solid electrolyte layer during pressing.
[0016] In some feasible embodiments, the electrode assembly further includes a second composite structure, which includes a second electrode, a solid electrolyte layer, and an insulating frame. The second main body and the solid electrolyte layer are both located within the insulating frame. Along the thickness direction of the electrode assembly, the first composite structure and the second composite structure are stacked, with the first main body of the first composite structure facing the second composite structure.
[0017] During the manufacturing process of the electrode assembly, a first composite structural component and a second composite structural component can be pre-formed. Then, the first and second composite structural components are stacked together. In the manufacturing process of the electrode assembly, both the first and second composite structural components are used as a single, integrated structure, which helps improve the processing efficiency of the electrode assembly.
[0018] In some feasible embodiments, solid electrolyte layers are respectively provided on both sides of the first main body along the thickness direction of the electrode assembly. The area of the solid electrolyte layer is smaller than the area of the second main body. The solid electrolyte layer is located in the first receiving hole. Along the thickness direction of the electrode assembly, the orthographic projection of the first insulating part does not overlap with the orthographic projection of the solid electrolyte layer.
[0019] The first insulating part has a protective and isolating effect on the solid electrolyte layer, reducing the possibility of cracking or falling off the edges of the solid electrolyte layer during the pressing process.
[0020] In some feasible embodiments, the electrode assembly further includes a second composite structure, which includes a second electrode and an insulating frame, with a second main body located within the insulating frame. The first and second composite structures are stacked along the thickness direction of the electrode assembly, with the first main body of the first composite structure facing the second composite structure.
[0021] During the manufacturing process of the electrode assembly, a first composite structural component and a second composite structural component can be pre-formed. Then, the first and second composite structural components are stacked together. In the manufacturing process of the electrode assembly, both the first and second composite structural components are used as a single, integrated structure, which helps improve the processing efficiency of the electrode assembly.
[0022] In some feasible ways, two or more first composite structural members are stacked along the thickness direction of the electrode assembly, and a second composite structural member is stacked with the outermost first composite structural member.
[0023] During the manufacturing process of the electrode assembly, a first composite structural component and a second composite structural component can be pre-formed. Then, the first composite structural components are stacked together. After the stacking process is completed, the second composite structural component is stacked on the outermost first composite structural component. In the manufacturing process of the electrode assembly, both the first and second composite structural components are used as a single, integrated structure, which helps improve the processing efficiency of the electrode assembly.
[0024] In some feasible ways, the insulating frame and the insulating element are in contact with each other along the thickness direction of the electrode assembly.
[0025] Both the insulating components and the insulating frame can protect and support the epitaxial portion, which helps to improve the support capacity of the epitaxial portion and the extrusion resistance of the epitaxial portion. This reduces the possibility of a short circuit between the first and second electrodes caused by warping or folding of the epitaxial portion under external extrusion pressure during the pressing process.
[0026] In some feasible embodiments, the first insulating part is in contact with the outer surface of the first main body, and the second insulating part is in contact with the outer surface of the second main body.
[0027] If there are gaps between the outer surfaces of the first and second main bodies and the inner surfaces of the insulating member, there is a possibility that lithium material included in the active material may deposit lithium and form lithium dendrites within these gaps. The formed lithium dendrites could connect the first and second electrodes, causing a short circuit between them and affecting the safety of the electrode assembly. The arrangement of the outer surfaces of the first and second main bodies in contact with the inner surfaces of the insulating member helps to reduce the likelihood of this problem occurring.
[0028] In some feasible embodiments, the second body portion includes a second current collector and a second active material layer, the portions of the second current collector and the second active material layer extending beyond the first body portion forming an epitaxial portion.
[0029] The epitaxial portion may include a portion of the second current collector and a portion of the second active material layer, such that the epitaxial portion itself has a relatively large thickness along the thickness direction of the electrode assembly, and the epitaxial portion itself has a large rigidity and strong resistance to extrusion. At the same time, the insulating component and the solid electrolyte layer can provide auxiliary support for the epitaxial portion, thereby further reducing the possibility of warping or folding of the epitaxial portion during the pressing process.
[0030] This application provides a battery cell that includes the electrode assembly described in the above embodiments.
[0031] This application provides a battery device that includes the battery cell described in the above embodiments.
[0032] This application provides an electrical device that includes the battery device described in the above embodiments, the battery device being 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 1This 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 cross-sectional view of the first composite structural member provided in an embodiment of this application;
[0040] Figure 7 This is a partial cross-sectional structural schematic diagram of an insulating member provided in an embodiment of this application;
[0041] Figure 8 This is a partial cross-sectional view of a second composite structural member provided in an embodiment of this application;
[0042] Figure 9 This is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;
[0043] Figure 10 This is a partial cross-sectional view of the first composite structural member provided in an embodiment of this application;
[0044] Figure 11 This is a partial cross-sectional view of a second composite structural member 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 of the manufacturing process of an electrode assembly provided in an embodiment of this application;
[0047] Figure 14 This is a schematic diagram of the manufacturing process of an electrode assembly provided in an embodiment of this application.
[0048] Explanation of reference numerals in the attached figures:
[0049] 1. Vehicle; 10. Battery unit; 10a. Housing; 10b. First housing section; 10c. Second housing section; 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; 61. First composite structural component; 62. Second composite structural component;
[0055] 70. First electrode; 71. First main body; 711. First current collector; 712. First active material layer;
[0056] 80. Second electrode; 81. Second main body; 810. Epitaxial portion; 811. Second current collector; 812. Second active material layer;
[0057] 90. Solid electrolyte layer;
[0058] 100. Insulating component; 101. First insulating part; 1011. First receiving hole; 102. Second insulating part; 1021. Second receiving hole;
[0059] 110. Insulating frame;
[0060] 210. First component;
[0061] 220. Second component;
[0062] 230. The third component;
[0063] Z, thickness direction. Detailed Implementation
[0064] 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.
[0065] 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.
[0066] 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.
[0067] 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.
[0068] 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.
[0069] 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.
[0070] 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.
[0071] 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.
[0072] 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.
[0073] 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.
[0074] 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.
[0075] 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.
[0076] 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.
[0077] 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.
[0078] 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.
[0079] In related technologies, for solid-state batteries, to improve the contact between the solid electrolyte layer and the electrodes, a pressing process is required to press the stacked solid electrolyte layer and electrodes. For example, warm isostatic pressing (WIP) is used to press the stacked solid electrolyte layer and electrodes. WIP involves high temperatures and high pressures. During pressing, compressive stress is applied along the thickness direction to both sides of the stacked solid electrolyte layer and electrodes. However, electrodes with opposite polarities have different areas, and the edge region of the larger electrode may extend beyond the smaller electrode, forming an epitaxial portion. During pressing, this epitaxial portion can warp and fold under external pressure, potentially causing a short circuit between electrodes with opposite polarities and affecting the safety of the electrode assembly.
[0080] To mitigate the problem of warping and folding of the epitaxial portion when subjected to external extrusion during the pressing process, the epitaxial portion can be supported or insulated from the other electrode.
[0081] Based on the above considerations, in order to alleviate the problem of warping and folding of the epitaxial portion under external extrusion pressure during the pressing process, the inventors, after in-depth research, designed an electrode assembly. In this electrode assembly, an insulating component is provided on the epitaxial portion of the electrode. The insulating component provides support for the epitaxial portion and isolates it from the other electrode, thereby reducing the possibility of short circuits between electrodes with opposite polarities and improving the safety of the electrode assembly.
[0082] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.
[0083] 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.
[0084] 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.
[0085] 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.
[0086] 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.
[0087] 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.
[0088] See Figure 2As 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.
[0089] 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.
[0090] 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.
[0091] 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.
[0092] 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.
[0093] 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.
[0094] 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.
[0095] 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.
[0096] 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.
[0097] 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.
[0098] 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.
[0099] 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.
[0100] 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.
[0101] See Figure 5 , Figure 6 and Figure 7 As shown, this application embodiment provides an electrode assembly 60, which includes a first composite structural member 61.
[0102] The first composite structural component 61 includes a first electrode 70, a second electrode 80, an insulating component 100, and a solid electrolyte layer 90.
[0103] The first electrode 70 includes a first main body portion 71. The first electrode 70 and the second electrode 80 have opposite polarities. The second electrode 80 includes a second main body portion 81. The area of the first main body portion 71 is smaller than the area of the second main body portion 81. The second main body portion 81 includes an extension portion 810 extending beyond the first main body portion 71. The insulating member 100 is an integrally formed structure. The insulating member 100 includes a first insulating portion 101 and a second insulating portion 102. Along the thickness direction Z of the electrode assembly 60, the first insulating portion 101 is disposed on the side of the extension portion 810 facing the first main body portion 71. The first insulating portion 101 covers the outer surface of the first main body portion 71. The second insulating portion 102 covers the outer surface of the second main body portion 81. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the first insulating portion 101 does not overlap with the orthographic projection of the first main body portion 71, and the orthographic projection of the second insulating portion 102 does not overlap with the orthographic projection of the second main body portion 81. Along the thickness direction Z of the electrode assembly 60, the first main body 71, the solid electrolyte layer 90, and the second main body 81 are stacked.
[0104] In this embodiment, the areas of the first main body portion 71 and the second main body portion 81 are different. A stepped structure is formed between the first main body portion 71 and the second main body portion 81, so that along the thickness direction Z of the electrode assembly 60, the side of the extension portion 810 facing the first main body portion 71 can form a space for accommodating the first insulating portion 101. The thickness direction Z of the electrode assembly 60 refers to the stacking direction of the first main body portion 71, the solid electrolyte layer 90, and the second main body portion 81.
[0105] In some feasible embodiments, the orthographic projection of the first main body portion 71 along the thickness direction Z of the electrode assembly 60 may lie within the orthographic projection of the second main body portion 81. The second main body portion 81 includes an extension portion 810 extending beyond the first main body portion 71. The orthographic projection of the extension portion 810 along the thickness direction Z of the electrode assembly 60 does not overlap with the orthographic projection of the first main body portion 71. The orthographic projection of the extension portion 810 along the thickness direction Z of the electrode assembly 60 overlaps with the orthographic projection of the first insulating portion 101.
[0106] The first insulating portion 101 is disposed correspondingly to the outer surface of the first main body portion 71. "Correspondingly disposed" means that the position of the first insulating portion 101 corresponds to the outer surface of the first main body portion 71, with the outer surface of the first main body portion 71 facing the first insulating portion 101. The first insulating portion 101 can cover or shield the outer surface of the first main body portion 71. Along the thickness direction Z of the electrode assembly 60, the first insulating portion 101 can cover or shield the epitaxial portion 810.
[0107] The second insulating portion 102 is disposed correspondingly to the outer surface of the extension portion 810. "Correspondingly disposed" means that the position of the second insulating portion 102 corresponds to the outer surface of the extension portion 810, with the outer surface of the extension portion 810 facing the second insulating portion 102. The second insulating portion 102 can cover or shield the outer surface of the extension portion 810.
[0108] In some feasible embodiments, the surface of the first insulating portion 101 facing away from the second main body portion 81 may be flush with the surface of the first main body portion 71 facing away from the second main body portion 81. Along the thickness direction Z of the electrode assembly 60, the thickness of the first insulating portion 101 may be equal to the thickness of the first main body portion 71.
[0109] In this embodiment, the first electrode 70, the second electrode 80, the insulating component 100, and the solid electrolyte layer 90 can be pre-formed into a first composite structure 61. During the forming process of the electrode assembly 60, the first composite structure 61 is used as an integral structure, which helps to improve the processing efficiency of the electrode assembly 60.
[0110] In some possible implementations, the electrode assembly 60 may include two or more first composite structural members 61. Along the thickness direction Z of the electrode assembly 60, two or more first composite structural members 61 are stacked sequentially. In any two adjacent first composite structural members 61, the first main body portion 71 of one faces the second main body portion 81 of the other.
[0111] In the electrode assembly 60 of this application embodiment, an integrally formed insulating member 100 is correspondingly provided on the extension portion 810 of the second main body portion 81. The first insulating portion 101 and the second insulating portion 102 of the insulating member 100 can protect and support the extension portion 810, thereby reducing the possibility of a short circuit between the first electrode 70 and the second electrode 80 due to warping or folding of the extension portion 810 under external extrusion pressure during the pressing process. At the same time, the first insulating portion 101 and the second insulating portion 102 can insulate and isolate the extension portion 810 from the first electrode 70, reducing the possibility of the extension portion 810 directly contacting the first electrode 70 and causing a short circuit due to warping or folding of the extension portion 810 under external extrusion pressure. This is beneficial to improving the safety of the electrode assembly 60 and the battery device 10.
[0112] In the battery cell 30 including the electrode assembly 60 of the present application embodiment, the first electrode 70 and the second electrode 80 expand or contract during charging or discharging. The insulating member 100 can support the epitaxial portion 810, so that when the first electrode 70 and the second electrode 80 expand or contract, the insulating member 100 can provide support for the epitaxial portion 810, reducing the possibility of short circuit between the first electrode 70 and the second electrode 80 due to warping or folding caused by the epitaxial portion 810 being subjected to compressive force, thereby improving the safety and cycle stability of the battery cell 30.
[0113] In some feasible ways, the orthographic projections of the first main body 71, the second main body 81, and the solid electrolyte layer 90 along the thickness direction Z of the electrode assembly 60 can all be rectangles.
[0114] In some examples, the second main body 81 can be rectangular. The extension 810 can be a rectangular ring structure with four sides. At least one side of the extension 810 can be provided with a first insulating part 101 and a second insulating part 102.
[0115] See also some of the possible implementation methods. Figure 6 and Figure 7As shown, the first insulating portion 101 is a frame having a first receiving hole 1011. Along the thickness direction Z of the electrode assembly 60, the first main body portion 71 is located within the first receiving hole 1011. Along the thickness direction Z of the electrode assembly 60, the first main body portion 71 does not extend beyond the first insulating portion 101.
[0116] The first insulating portion 101 extends circumferentially along the first main body portion 71 to increase the shielding area of the first insulating portion 101 on the first main body portion 71, thereby improving the protective, supporting, and insulating isolation capabilities of the first insulating portion 101 on the first main body portion 71. The first insulating portion 101 can cover the outer surface of the first main body portion 71.
[0117] See in some examples Figure 6 As shown, the first main body 71 includes a first current collector 711 and a first active material layer 712. The first active material layer 712 is respectively disposed on both sides of the first current collector 711. The area of the first current collector 711 can be equal to the area of the first active material layer 712.
[0118] The first insulating portion 101 can extend circumferentially along the first main body portion 71, so that the first insulating portion 101 can protect and isolate the first active material layer 712, which helps to reduce the possibility of material cracking and falling off at the edge of the first active material layer 712 during the pressing process.
[0119] In some examples, the extension portion 810 can be a ring structure. The edges of the second main body portion 81 all extend beyond the first main body portion 71. The first insulating portion 101 can be a closed ring frame or a non-closed ring frame.
[0120] For example, the second main body portion 81 can be rectangular. The extension portion 810 can be a rectangular ring structure with four sides. The first insulating portion 101 can be a non-closed annular frame with three sides. The first insulating portion 101 is respectively provided on the three sides of the extension portion 810. The first insulating portion 101 can also be a closed annular frame with four sides. The first insulating portion 101 is respectively provided on the four sides of the extension portion 810.
[0121] See also some of the possible implementation methods. Figure 6 and Figure 7 As shown, the second insulating portion 102 is a frame having a second receiving hole 1021, and the second main body portion 81 is located within the second receiving hole 1021 along the thickness direction Z of the electrode assembly 60. The second main body portion 81 does not extend beyond the second insulating portion 102 along the thickness direction Z of the electrode assembly 60.
[0122] The second insulating portion 102 extends circumferentially along the second main body portion 81 to increase the shielding area of the second insulating portion 102 on the second main body portion 81, thereby improving the protective, supporting, and insulating isolation capabilities of the second insulating portion 102 on the second main body portion 81. The second insulating portion 102 can cover the outer surface of the second main body portion 81.
[0123] See in some examples Figure 6 As shown, the second main body 81 includes a second current collector 811 and a second active material layer 812. The second active material layer 812 is disposed on both sides of the second current collector 811. The area of the second current collector 811 can be equal to the area of the second active material layer 812.
[0124] The second insulating portion 102 can extend circumferentially along the second main body portion 81, so that the second insulating portion 102 can protect and isolate the second active material layer 812, which helps to reduce the possibility of material cracking and falling off at the edge of the second active material layer 812 during the pressing process.
[0125] In some examples, the extension portion 810 can be a ring structure. The edges of the second main body portion 81 all extend beyond the first main body portion 71. The second insulating portion 102 can be a closed ring frame or a non-closed ring frame.
[0126] For example, the second main body portion 81 can be rectangular. The extension portion 810 can be a rectangular ring structure with four sides. The second insulating portion 102 can be a non-closed annular frame with three sides. The second insulating portion 102 is respectively provided on the three sides of the extension portion 810. The second insulating portion 102 can also be a closed annular frame with four sides. The second insulating portion 102 is respectively provided on the four sides of the extension portion 810.
[0127] In some possible implementations, a solid electrolyte layer 90 is disposed in at least one of the first receiving hole 1011 and the second receiving hole 1021.
[0128] According to the design requirements of the electrode assembly 60, the arrangement of the solid electrolyte layer 90 can be selected to ensure that the electrode assembly 60 maintains good electrochemical performance.
[0129] In some examples, a solid electrolyte layer 90 is disposed in the second receiving hole 1021. Alternatively, a solid electrolyte layer 90 is disposed in the first receiving hole 1011. Alternatively, solid electrolyte layers 90 are disposed in both the first receiving hole 1011 and the second receiving hole 1021.
[0130] See in some examples Figure 6As shown, along the thickness direction Z of the electrode assembly 60, solid electrolyte layers 90 are respectively provided on both sides of the second main body 81. The area of the solid electrolyte layer 90 is larger than the area of the first main body 71. The solid electrolyte layer 90 is located within the second receiving hole 1021. The solid electrolyte layer 90 covers at least a portion of the outer extension 810. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the first insulating portion 101 and the orthographic projection of the solid electrolyte layer 90 have an overlapping area.
[0131] Both the insulating component 100 and the solid electrolyte layer 90 provide protection and support for the epitaxial portion 810, which helps to improve the support capacity of the epitaxial portion 810 and its resistance to compression. This reduces the possibility of a short circuit between the first electrode 70 and the second electrode 80 caused by warping or folding of the epitaxial portion 810 under external extrusion pressure during the pressing process. The insulating component 100 also provides protection and isolation for the solid electrolyte layer 90, reducing the possibility of cracking or detachment of the edges of the solid electrolyte layer 90 during the pressing process.
[0132] For example, a solid electrolyte layer 90 covers the entire epitaxial portion 810. The solid electrolyte layer 90 is disposed between the epitaxial portion 810 and the first insulating portion 101. The solid electrolyte layer 90 isolates the epitaxial portion 810 and the first insulating portion 101.
[0133] For example, the area of the solid electrolyte layer 90 is equal to the area of the second body portion 81.
[0134] See in some examples Figure 8 and Figure 9 As shown, the electrode assembly 60 also includes a second composite structure 62. The second composite structure 62 includes a second electrode 80, a solid electrolyte layer 90, and an insulating frame 110. The second main body portion 81 and the solid electrolyte layer 90 are both located within the insulating frame 110. Along the thickness direction Z of the electrode assembly 60, the first composite structure 61 and the second composite structure 62 are stacked, with the first main body portion 71 of the first composite structure 61 facing the second composite structure 62.
[0135] During the manufacturing process of the electrode assembly 60, a first composite structural component 61 and a second composite structural component 62 can be pre-formed. Then, the first composite structural component 61 and the second composite structural component 62 are stacked. In the manufacturing process of the electrode assembly 60, both the first composite structural component 61 and the second composite structural component 62 are used as a single integral structure, which helps to improve the manufacturing efficiency of the electrode assembly 60.
[0136] Both the second main body portion 81 and the solid electrolyte layer 90 are located within the insulating frame 110. Along the thickness direction Z of the electrode assembly 60, neither the second main body portion 81 nor the solid electrolyte layer 90 extends beyond the insulating frame 110. Along the thickness direction Z of the electrode assembly 60, the orthographic projections of the second main body portion 81 and the solid electrolyte layer 90 do not overlap with the orthographic projection of the insulating frame 110.
[0137] In the second composite structural component 62, the insulating frame 110 provides protection, support, and insulation to the second main body 81 and the solid electrolyte layer 90. The insulating frame 110 can cover the outer surfaces of the second main body 81 and the solid electrolyte layer 90. The insulating frame 110 provides protection and insulation to the solid electrolyte layer 90, reducing the possibility of cracking or detachment of the edges of the solid electrolyte layer 90 during the pressing process.
[0138] In some examples, in the second composite structure 62, solid electrolyte layers 90 are respectively provided on both sides of the second main body 81 along the thickness direction Z of the electrode assembly 60.
[0139] See in some examples Figure 9 As shown, along the thickness direction Z of the electrode assembly 60, two or more first composite structural members 61 are stacked, and a second composite structural member 62 is stacked with the outermost first composite structural member 61.
[0140] During the manufacturing process of the electrode assembly 60, the first composite structural component 61 and the second composite structural component 62 can be pre-formed. Then, the first composite structural components 61 are stacked. After the stacking process of the first composite structural components 61 is completed, the second composite structural component 62 is stacked on the outermost first composite structural component 61. In the manufacturing process of the electrode assembly 60, both the first composite structural component 61 and the second composite structural component 62 are used as a single integral structure, which helps to improve the manufacturing efficiency of the electrode assembly 60.
[0141] See in some examples Figure 9 As shown, in the first composite structure 61, the solid electrolyte layer 90 can cover the entire epitaxial portion 810. In any two adjacent first composite structures 61, the first insulating portion 101 of one is in direct contact with the solid electrolyte layer 90 of the other.
[0142] See in some examples Figure 9 As shown, along the thickness direction Z of the electrode assembly 60, the insulating frame 110 and the insulating member 100 are in contact with each other. Exemplarily, along the thickness direction Z of the electrode assembly 60, the orthographic projection of the insulating frame 110 overlaps with the orthographic projection of the second insulating portion 102. Exemplarily, along the thickness direction Z of the electrode assembly 60, the orthographic projection of the insulating frame 110 does not overlap with the orthographic projection of the first insulating portion 101.
[0143] Both the insulating component 100 and the insulating frame 110 can protect and support the epitaxial portion 810, which helps to improve the support capacity of the epitaxial portion 810 and the extrusion resistance of the epitaxial portion 810. This reduces the possibility of a short circuit between the first electrode 70 and the second electrode 80 caused by warping or folding of the epitaxial portion 810 under external extrusion pressure during the pressing process.
[0144] In some feasible ways, one of the first electrode 70 and the second electrode 80 is a positive electrode and the other is a negative electrode.
[0145] See in some examples Figure 10 As shown, along the thickness direction Z of the electrode assembly 60, solid electrolyte layers 90 are respectively provided on both sides of the first main body 71. The area of the solid electrolyte layer 90 is smaller than the area of the second main body 81. The solid electrolyte layer 90 is located within the first receiving hole 1011. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the first insulating portion 101 does not overlap with the orthographic projection of the solid electrolyte layer 90.
[0146] The first insulating part 101 has a protective and insulating effect on the solid electrolyte layer 90, reducing the possibility of cracking or falling off the edge of the solid electrolyte layer 90 during the pressing process.
[0147] For example, the area of the solid electrolyte layer 90 is equal to the area of the first main body portion 71. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the extension portion 810 does not overlap with the orthographic projection of the solid electrolyte layer 90.
[0148] See in some examples Figure 11 and Figure 12 As shown, the electrode assembly 60 also includes a second composite structure 62. The second composite structure 62 includes a second electrode 80 and an insulating frame 110. A second main body portion 81 is located within the insulating frame 110. The first composite structure 61 and the second composite structure 62 are stacked along the thickness direction Z of the electrode assembly 60. The first main body portion 71 of the first composite structure 61 faces the second composite structure 62.
[0149] During the manufacturing process of the electrode assembly 60, a first composite structural component 61 and a second composite structural component 62 can be pre-formed. Then, the first composite structural component 61 and the second composite structural component 62 are stacked. In the manufacturing process of the electrode assembly 60, both the first composite structural component 61 and the second composite structural component 62 are used as a single integral structure, which helps to improve the manufacturing efficiency of the electrode assembly 60.
[0150] In the second composite structure 62, the second main body 81 is located within the insulating frame 110. Along the thickness direction Z of the electrode assembly 60, the second main body 81 does not extend beyond the insulating frame 110. Along the thickness direction Z of the electrode assembly 60, the orthographic projection of the second main body 81 does not overlap with the orthographic projection of the insulating frame 110.
[0151] The insulating frame 110 provides protection, support, and insulation to the second main body 81. The insulating frame 110 can cover the outer surface of the second main body 81, which helps to reduce the possibility of cracking or falling off the edge of the second active material layer 812 in the second main body 81 during the pressing process.
[0152] See in some examples Figure 12 As shown, along the thickness direction Z of the electrode assembly 60, two or more first composite structural members 61 are stacked, and a second composite structural member 62 is stacked with the outermost first composite structural member 61.
[0153] For example, the solid electrolyte layer 90 is located within the first receiving hole 1011. In the first composite structure 61, the first insulating portion 101 is in direct contact with the epitaxial portion 810. In any two adjacent first composite structures 61, the first insulating portion 101 of one is in direct contact with the epitaxial portion 810 of the other. For example, in any two adjacent first composite structures 61, the first insulating portion 101 of one is in direct contact with the second active material layer 812 of the other.
[0154] See in some examples Figure 12 As shown, along the thickness direction Z of the electrode assembly 60, the insulating frame 110 and the insulating member 100 are in contact with each other. Exemplarily, along the thickness direction Z of the electrode assembly 60, the orthographic projection of the insulating frame 110 overlaps with the orthographic projection of the second insulating portion 102. Exemplarily, along the thickness direction Z of the electrode assembly 60, the orthographic projection of the insulating frame 110 does not overlap with the orthographic projection of the first insulating portion 101.
[0155] Both the insulating component 100 and the insulating frame 110 can protect and support the epitaxial portion 810, which helps to improve the support capacity of the epitaxial portion 810 and the extrusion resistance of the epitaxial portion 810. This reduces the possibility of a short circuit between the first electrode 70 and the second electrode 80 caused by warping or folding of the epitaxial portion 810 under external extrusion pressure during the pressing process.
[0156] In some feasible ways, the insulating element 100 and the insulating frame 110 may each be, but are not limited to, at least one of light-curing adhesive, hot melt adhesive and tape.
[0157] In some examples, the insulating element 100 may include a photocurable adhesive. After the photocurable adhesive is applied to the epitaxial portion 810, it is irradiated with light (e.g., ultraviolet light) to cure the photocurable adhesive and form the insulating element 100.
[0158] The insulating frame 110 may include a photocurable adhesive. After the photocurable adhesive is applied circumferentially to the integral structure formed by the second body portion 81 and the solid electrolyte layer 90, light (e.g., ultraviolet light) is used to irradiate the photocurable adhesive to cure it and form the insulating frame 110. Alternatively, after the photocurable adhesive is applied circumferentially to the second body portion 81, light (e.g., ultraviolet light) is used to irradiate the photocurable adhesive to cure it and form the insulating frame 110.
[0159] In some examples, the insulating element 100 may include hot melt adhesive. Molten hot melt adhesive is applied to the epitaxial portion 810. The hot melt adhesive cools and solidifies to form the insulating element 100.
[0160] The insulating frame 110 may include hot melt adhesive. A molten hot melt adhesive is applied circumferentially to the integral structure formed between the second body portion 81 and the solid electrolyte layer 90. The hot melt adhesive cools and solidifies to form the insulating frame 110. Alternatively, a molten hot melt adhesive is applied circumferentially to the second body portion 81. The hot melt adhesive cools and solidifies to form the insulating frame 110.
[0161] In some examples, the insulating element 100 may include adhesive tape. The tape, cut to a predetermined shape, is directly adhered to the extension 810 to form the insulating element 100.
[0162] The insulating frame 110 may include adhesive tape. Adhesive tape cut to a predetermined shape is directly adhered circumferentially to the integral structure formed by the second main body 81 and the solid electrolyte layer 90 to form the insulating frame 110. Alternatively, adhesive tape cut to a predetermined shape is directly adhered circumferentially to the second main body 81 to form the insulating frame 110.
[0163] See also some of the possible implementation methods. Figure 12 As shown, the first insulating portion 101 is in contact with the outer surface of the first main body portion 71. The second insulating portion 102 is in contact with the outer surface of the second main body portion 81. There is no gap between the outer surfaces of the first main body portion 71 and the second main body portion 81 and the inner surface of the insulating member 100.
[0164] If there are gaps between the outer surfaces of the first main body portion 71 and the second main body portion 81 and the inner surface of the insulating member 100, there is a possibility that lithium material included in the active material may deposit lithium and form lithium dendrites within these gaps. The formed lithium dendrites could connect the first electrode 70 and the second electrode 80, causing a short circuit between them and affecting the safety of the electrode assembly 60. The arrangement of the outer surfaces of the first main body portion 71 and the second main body portion 81 in contact with the inner surface of the insulating member 100 helps to reduce the likelihood of this problem occurring.
[0165] See also some of the possible implementation methods. Figure 12 As shown, the second main body portion 81 includes a second current collector 811 and a second active material layer 812. The portions of the second current collector 811 and the second active material layer 812 that extend beyond the first main body portion 71 form an epitaxial portion 810.
[0166] The epitaxial portion 810 may include a portion of the second current collector 811 and a portion of the second active material layer 812, such that the thickness of the epitaxial portion 810 is relatively large along the thickness direction Z of the electrode assembly 60, the epitaxial portion 810 itself has greater rigidity and stronger resistance to extrusion, and the insulating component 100 and the solid electrolyte layer 90 can provide auxiliary support for the epitaxial portion 810, thereby further reducing the possibility of warping or folding of the epitaxial portion 810 during the pressing process.
[0167] In some examples, a second active material layer 812 is provided on both sides of the second current collector 811 along the thickness direction Z of the electrode assembly 60.
[0168] In some examples, the second current collector 811 does not extend beyond the second active material layer 812 in a direction perpendicular to the thickness direction Z. The outer surface of the second current collector 811 is flush with the outer surface of the second active material layer 812. The second active material layer 812 covers the entire second current collector 811.
[0169] In some possible implementations, the electrode assembly 60 includes a first composite structure 61 and a second composite structure 62. In the first composite structure 61, solid electrolyte layers 90 are respectively disposed on both sides of the second main body portion 81 along the thickness direction Z of the electrode assembly 60, and the solid electrolyte layers 90 are located within the second receiving hole 1021.
[0170] See in some examples Figure 13 As shown, the manufacturing process of electrode assembly 60 includes:
[0171] <Fabrication of the First Composite Structural Component 61>
[0172] A second electrode 80 and a solid electrolyte layer 90 are provided, and the second main body 81 and the solid electrolyte layer 90 are stacked to form a first component 210.
[0173] The first component 210 is pressed using a warm isostatic pressing process;
[0174] A first electrode 70 is provided, and the first electrode 70 and the first component 210 are stacked together.
[0175] An insulating member 100 is provided on the outer extension 810 of the second main body 81 to form a first composite structural member 61;
[0176] <Fabrication of the second composite structural component 62>
[0177] Provide a second electrode plate of 80;
[0178] A solid electrolyte layer 90 is provided, and the second main body 81 and the solid electrolyte layer 90 are stacked to form a second component 220;
[0179] The second component 220 is pressed using a warm isostatic pressing process;
[0180] An insulating frame 110 is provided around the second component 220 to form a second composite structural component 62.
[0181] <Making Electrode Components 60>
[0182] Two or more first composite structural components 61 are stacked together;
[0183] A second composite structural member 62 is stacked on the outermost first composite structural member 61;
[0184] The first composite structural component 61 and the second composite structural component 62 are pressed using a warm isostatic pressing process to form the electrode assembly 60.
[0185] In some possible implementations, the electrode assembly 60 includes a first composite structure 61 and a second composite structure 62. In the first composite structure 61, solid electrolyte layers 90 are respectively disposed on both sides of the first main body portion 71 along the thickness direction Z of the electrode assembly 60. The solid electrolyte layers 90 are located within the first receiving hole 1011.
[0186] See in some examples Figure 14 As shown, the manufacturing process of electrode assembly 60 includes:
[0187] <Fabrication of the First Composite Structural Component 61>
[0188] A first electrode 70 and a solid electrolyte layer 90 are provided, and the first main body 71 and the solid electrolyte layer 90 are stacked to form a third component 230.
[0189] The third component 230 is pressed using a warm isostatic pressing process;
[0190] Provide a second electrode plate of 80;
[0191] The second pole piece 80 and the third component 230 are stacked together.
[0192] An insulating member 100 is provided on the outer extension 810 of the second main body 81 to form a first composite structural member 61;
[0193] <Fabrication of the second composite structural component 62>
[0194] Provide a second electrode plate of 80;
[0195] An insulating frame 110 is provided around the second main body 81 to form a second composite structural component 62;
[0196] <Making Electrode Components 60>
[0197] Two or more first composite structural components 61 are stacked together;
[0198] A second composite structure 62 is stacked on the outermost first composite structure 61; the first composite structure 61 and the second composite structure 62 are pressed using a warm isostatic pressing process to form the electrode assembly 60.
[0199] This application also provides a battery cell 30, which includes an electrode assembly 60 from any of the above embodiments.
[0200] This application also provides a battery device 10, including a battery cell 30 from any of the above embodiments.
[0201] 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.
[0202] 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: The first composite structural component includes: The first electrode includes the first main body; The second electrode has opposite polarities to the first electrode and the second electrode. The second electrode includes a second main body portion, the area of the first main body portion is smaller than the area of the second main body portion, and the second main body portion includes an extension portion that extends beyond the first main body portion. An insulating component, wherein the insulating component is an integrally formed structure, the insulating component includes a first insulating portion and a second insulating portion. Along the thickness direction of the electrode assembly, the first insulating portion is disposed on the side of the extension portion facing the first main body portion, the first insulating portion covers the outer side surface of the first main body portion, and the second insulating portion covers the outer side surface of the second main body portion. Along the thickness direction of the electrode assembly, the orthographic projection of the first insulating portion does not overlap with the orthographic projection of the first main body portion, and the orthographic projection of the second insulating portion does not overlap with the orthographic projection of the second main body portion. A solid electrolyte layer is provided, wherein the first main body, the solid electrolyte layer and the second main body are stacked along the thickness direction of the electrode assembly.
2. The electrode assembly according to claim 1, characterized in that, The first insulating part is a frame with a first receiving hole, and the first main body is located in the first receiving hole along the thickness direction of the electrode assembly.
3. The electrode assembly according to claim 2, characterized in that, The second insulating part is a frame with a second receiving hole, and the second main body is located in the second receiving hole along the thickness direction of the electrode assembly.
4. The electrode assembly according to claim 3, characterized in that, The solid electrolyte layer is disposed in at least one of the first receiving hole and the second receiving hole.
5. The electrode assembly according to claim 4, characterized in that, Along the thickness direction of the electrode assembly, solid electrolyte layers are respectively disposed on both sides of the second main body. The area of the solid electrolyte layer is larger than the area of the first main body, and the solid electrolyte layer is located within the second receiving hole. The solid electrolyte layer covers at least a portion of the epitaxial portion, and along the thickness direction of the electrode assembly, the orthographic projection of the first insulating portion overlaps with the orthographic projection of the solid electrolyte layer.
6. The electrode assembly according to claim 5, characterized in that, The electrode assembly further includes a second composite structure, which comprises a second electrode, the solid electrolyte layer, and an insulating frame. The second main body and the solid electrolyte layer are both located within the insulating frame. Along the thickness direction of the electrode assembly, the first composite structural member and the second composite structural member are stacked, with the first main body portion of the first composite structural member facing the second composite structural member.
7. The electrode assembly according to claim 4, characterized in that, Along the thickness direction of the electrode assembly, solid electrolyte layers are respectively disposed on both sides of the first main body portion. The area of the solid electrolyte layer is smaller than the area of the second main body portion, and the solid electrolyte layer is located within the first receiving hole. Along the thickness direction of the electrode assembly, the orthographic projection of the first insulating portion does not overlap with the orthographic projection of the solid electrolyte layer.
8. The electrode assembly according to claim 7, characterized in that, The electrode assembly further includes a second composite structural component, which comprises a second electrode plate and an insulating frame, with the second main body located within the insulating frame. Along the thickness direction of the electrode assembly, the first composite structural member and the second composite structural member are stacked, with the first main body portion of the first composite structural member facing the second composite structural member.
9. The electrode assembly according to claim 6 or 8, characterized in that, Along the thickness direction of the electrode assembly, two or more first composite structural members are stacked together, and the second composite structural member is stacked with the outermost first composite structural member.
10. The electrode assembly according to claim 6, 8 or 9, characterized in that, Along the thickness direction of the electrode assembly, the insulating frame is in contact with the insulating element.
11. The electrode assembly according to any one of claims 1 to 10, characterized in that, The first insulating part is in contact with the outer side of the first main body, and the second insulating part is in contact with the outer side of the second main body.
12. The electrode assembly according to any one of claims 1 to 11, characterized in that, The second main body includes a second current collector and a second active material layer, the portions of the second current collector and the second active material layer extending beyond the first main body forming the epitaxial portion.
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.