Method for manufacturing electrode assembly, battery cell, battery device, and electric device

Abstract

The application provides a manufacturing method of an electrode assembly, a battery monomer, a battery device and a power utilization device. The manufacturing method of the electrode assembly comprises the following steps: providing an insulating substrate; disposing an electrolyte material on the insulating substrate and forming a solid-state electrolyte layer, the solid-state electrolyte layer has opposite first and second surfaces, and the insulating substrate is connected with the second surface; removing a middle region of the insulating substrate to form an insulating layer with a containing space, and the second surface is exposed to the containing space; providing a first pole piece, the first pole piece is arranged on the first surface; and providing a second pole piece, at least part of the second pole piece is located in the containing space, and the second pole piece is arranged on the second surface.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a method for manufacturing 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 the electrical performance of battery devices has always been a research direction in battery technology development. Summary of the Invention

[0003] In view of the above problems, this application provides a method for manufacturing an electrode assembly, a battery cell, a battery device, and an electrical device, which can help improve the electrical performance of the battery device.

[0004] This application provides a method for manufacturing an electrode assembly, comprising:

[0005] Provide insulating substrate;

[0006] An electrolyte material is disposed on an insulating substrate and a solid electrolyte layer is formed thereon. The solid electrolyte layer has a first surface and a second surface opposite to each other, and the insulating substrate is connected to the second surface.

[0007] The middle region of the insulating substrate is removed to form an insulating layer with a receiving space, and the second surface is exposed in the receiving space;

[0008] A first electrode is provided, and the first electrode is disposed on a first surface;

[0009] A second electrode is provided, at least a portion of which is located within a receiving space, and the second electrode is disposed on a second surface.

[0010] The electrode assembly manufacturing method of this application embodiment involves providing an insulating substrate as a base, then depositing an electrolyte material on the insulating substrate and forming a solid electrolyte layer. After removing the material in the middle region of the insulating substrate, an insulating layer is formed. Because the insulating substrate itself has good surface flatness, the solid electrolyte layer formed on the insulating substrate has good thickness consistency, uniform thickness, and good surface flatness. This facilitates good electrochemical reaction performance between the first electrode, the solid electrolyte layer, and the second electrode, thereby improving the electrical performance of the electrode assembly.

[0011] The electrolyte material itself possesses adhesive properties, allowing it to bond firmly to the insulating substrate, making it difficult for the formed solid electrolyte layer to separate from the insulating substrate. The formed insulating layer provides circumferential insulation to the edges of the second electrode. The tight fit between the formed insulating layer and the solid electrolyte layer reduces the possibility of gaps between them, improving the insulation effect and thus reducing the likelihood of short circuits caused by burrs penetrating gaps at the electrode edges, thereby enhancing the safety of the electrode assembly.

[0012] In some feasible methods, the surface roughness of the insulating substrate ranges from 0.04 micrometers to 2.0 micrometers.

[0013] The smaller the surface roughness of the insulating substrate, the higher its surface flatness, resulting in a more uniform thickness and better surface flatness of the formed solid electrolyte layer. When the surface roughness of the insulating substrate is less than 0.04 micrometers, the processing difficulty of the insulating substrate becomes relatively high, leading to increased processing costs. When the surface roughness of the insulating substrate is greater than 2.0 micrometers, the surface flatness of the insulating substrate decreases, affecting the thickness uniformity of the solid electrolyte layer. In the embodiments of this application, the surface roughness of the insulating substrate is set between 0.04 micrometers and 2.0 micrometers, which helps to reduce the possibility of the above problems.

[0014] In some feasible ways, the thickness of the insulating layer is less than the thickness of the second electrode.

[0015] After the second electrode is placed on the second surface, the second electrode and the solid electrolyte layer need to be pressed together. There is a height difference between the surface of the insulating layer and the surface of the second electrode. During the pressing process, the insulating layer is less likely to bear pressure, reducing the possibility of insufficient pressure on the second electrode due to the insulating layer bearing pressure. This reduces the possibility of deviations in the adhesion between the second electrode and the solid electrolyte layer caused by insufficient pressure on the second electrode. Deviations in the adhesion between the second electrode and the solid electrolyte layer will affect the electrical performance of the two layers.

[0016] In some feasible implementations, the thickness of the insulating layer is D, and the thickness of the second electrode is H, where 0 < D < H / 2.

[0017] An insulating layer and a solid electrolyte layer form a first composite structure. A second electrode is disposed on the solid electrolyte layer of one first composite structure. One first electrode, two first composite structures, and one second electrode form a second composite structure. Two or more second composite structures can be stacked to form an electrode assembly. In the electrode assembly, a number of first electrodes have solid electrolyte layers disposed on both sides, and the insulating layers disposed on each of the two solid electrolyte layers face each other. Since D < H / 2, during the pressing process, it is unlikely that the two insulating layers facing each other will come into contact and press against each other. On the one hand, this reduces the possibility of insufficient pressure on the second electrode due to contact and pressing between the two insulating layers, thereby reducing the possibility of poor adhesion between the second electrode and the solid electrolyte layer due to insufficient pressure on the second electrode; on the other hand, it reduces the possibility of compression deformation of the insulating layer due to contact and pressing between the two insulating layers. In the case of compression deformation of the insulating layer, the insulating layer will squeeze the second electrode, and there is a possibility that the active material of the second electrode may peel off or fall off due to pressure.

[0018] In some feasible embodiments, the second electrode includes a second current collector and a second active material layer disposed on the second current collector, the thickness of the second active material layer being greater than the thickness of the insulating layer.

[0019] The second current collector is located outside the housing space of the insulating layer. The second current collector will not come into contact with the insulating layer. During the placement of the second electrode into the housing space and during the pressing process, the second current collector will not come into contact with the insulating layer, reducing the possibility of scratches or damage to the insulating layer caused by the second current collector scraping against it.

[0020] In some feasible ways, the insulating layer contacts the side surface of the second electrode against the inner wall of the accommodating space.

[0021] The insulating layer contacts the second electrode, ensuring there are no gaps between them. During the manufacturing process of the second electrode, burrs may form at its edges. The insulating layer blocks these burrs, reducing the likelihood of a short circuit between the first and second electrodes caused by burrs connecting them, thus improving the safety of the electrode assembly.

[0022] The insulating layer supports the edge region of the second electrode. The second active material layer of the second electrode is located within the space contained in the insulating layer. During the pressing process, the insulating layer can limit the outward extension of the second active material layer under pressure, reducing the possibility of cracking or peeling of the second active material layer under pressure.

[0023] In some feasible implementations, the second surface has a surface area exposed in the containment space, and the projected area of ​​the second electrode on the solid electrolyte layer is the same as the area of ​​the surface area.

[0024] The projection of the second electrode onto the solid electrolyte layer overlaps with the surface area. The inner wall of the insulating layer facing the receiving space can be a vertical wall, which facilitates the placement of the second electrode within the receiving space.

[0025] In some feasible methods, the width W of the insulating layer is in the range of 3 mm to 5 mm, which gives the insulating layer itself good structural strength and insulation performance. At the same time, it can also help reduce the occupancy rate of the insulating layer on the second surface of the solid electrolyte layer, so that the contact area between the second surface and the second electrode is relatively large, which is beneficial to improving the energy density of the electrode assembly.

[0026] In some feasible ways, the material of the insulating substrate includes plastic.

[0027] Plastics are easy to process and mold, which reduces the processing difficulty of insulating substrates. At the same time, it is relatively easy to mold insulating substrates with relatively small surface roughness, so that the insulating substrate itself has good surface flatness.

[0028] In some feasible methods, an electrolyte material is coated onto an insulating substrate using a coating process to form a solid electrolyte layer.

[0029] The coating process allows for precise control of the electrolyte material coating amount. Therefore, after coating the electrolyte material onto the insulating substrate, this process improves the thickness uniformity and surface smoothness of the electrolyte material. By using an insulating substrate with good surface smoothness as the base and employing a coating process with precisely controllable coating thickness, the thickness uniformity and surface smoothness of the formed solid electrolyte layer can be effectively improved.

[0030] In some feasible implementations, the first electrode is the negative electrode and the second electrode is the positive electrode.

[0031] In some feasible ways, an insulating layer and a solid electrolyte layer form a first composite structure, a first composite structure is disposed on each side of a first electrode, a first electrode, two first composite structures and a second electrode form a second composite structure, and two or more second composite structures are stacked to form an electrode assembly.

[0032] This application provides a battery cell that includes a casing and an electrode assembly.

[0033] The electrode assembly is disposed within the housing. The electrode assembly includes a first electrode, a solid electrolyte layer, a second electrode, and an insulating layer. The first electrode, the solid electrolyte layer, and the second electrode are stacked on top of each other. The solid electrolyte layer has a first surface and a second surface. The first electrode is disposed on the first surface, and the second electrode and the insulating layer are disposed on the second surface. The insulating layer extends circumferentially along the second electrode, and the thickness of the insulating layer is less than the thickness of the second electrode.

[0034] After the second electrode is placed on the second surface, the second electrode and the solid electrolyte layer need to be pressed together. There is a height difference between the surface of the insulating layer and the surface of the second electrode. During the pressing process, the insulating layer is less likely to bear pressure, reducing the possibility of insufficient pressure on the second electrode due to the insulating layer bearing pressure. This reduces the possibility of deviations in the adhesion between the second electrode and the solid electrolyte layer caused by insufficient pressure on the second electrode. Deviations in the adhesion between the second electrode and the solid electrolyte layer will affect the electrical performance of the two layers.

[0035] In some feasible implementations, the thickness of the insulating layer is D, and the thickness of the second electrode is H, where 0 < D < H / 2.

[0036] An insulating layer and a solid electrolyte layer form a first composite structure. A second electrode is disposed on the solid electrolyte layer of one first composite structure. One first electrode, two first composite structures, and one second electrode form a second composite structure. Two or more second composite structures can be stacked to form an electrode assembly. In the electrode assembly, when a portion of the first electrodes have solid electrolyte layers disposed on both sides, the insulating layers disposed on each of the two solid electrolyte layers face each other. Since D < H / 2, during the pressing process, it is less likely that the two insulating layers facing each other will come into contact and press against each other. On the one hand, this reduces the possibility of insufficient pressure on the second electrode due to contact and pressing between the two insulating layers, thereby reducing the possibility of deviation in the tightness of the fit between the second electrode and the solid electrolyte layer due to insufficient pressure on the second electrode. On the other hand, it reduces the possibility of compression deformation of the insulating layer due to contact and pressing between the two insulating layers. If the insulating layer is compressed and deformed, the insulating layer will squeeze the second electrode, and there is a possibility that the active material of the second electrode may peel off or fall off due to pressure.

[0037] In some feasible embodiments, the second electrode includes a second current collector and a second active material layer disposed on the second current collector, the thickness of the second active material layer being greater than the thickness of the insulating layer.

[0038] The second current collector is located outside the housing space of the insulating layer. The second current collector will not come into contact with the insulating layer. During the placement of the second electrode into the housing space and during the pressing process, the second current collector will not come into contact with the insulating layer, reducing the possibility of scratches or damage to the insulating layer caused by the second current collector scraping against it.

[0039] This application provides a battery device that includes the aforementioned battery cell.

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

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

[0042] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

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

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

[0045] Figure 4 This is a partially exploded structural diagram of a battery cell provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the manufacturing process of an electrode assembly provided in an embodiment of this application;

[0047] Figure 6 This is a partial cross-sectional view of an electrode assembly provided in an embodiment of this application;

[0048] Figure 7 This is a schematic diagram of the manufacturing process of an electrode assembly provided in an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Vehicle; 10. Battery assembly; 10a. Housing; 10b. First housing section; 10c. Second housing section;

[0051] 11. Controller; 12. Motor;

[0052] 20. Battery module;

[0053] 30. Battery cell;

[0054] 40. End cap; 41. Electrode terminal;

[0055] 50. Shell;

[0056] 60. Electrode assembly; 61. First electrode; 611. First current collector; 612. First active material layer; 62. Second electrode; 621. Second current collector; 622. Second active material layer; 63. Solid electrolyte layer; 631. First surface; 632. Second surface; 64. Insulating layer; 641. Receiving space; 642. Inner wall;

[0057] 100. Insulating substrate;

[0058] 110. First composite structure;

[0059] 120. Second composite structure. Detailed Implementation

[0060] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0061] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0062] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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.

[0063] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0067] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0068] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. The battery device mentioned in this application can be a battery pack. For example, the battery device mentioned in this application can include battery modules, etc. A battery device generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0069] A 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.

[0070] 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 collection section and a positive electrode tab connected to the current collection section. The positive current collection section is coated with the positive active material layer. The positive electrode tab is not 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.

[0071] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode current collection section and a negative electrode tab connected to the negative electrode current collection section. The negative electrode current collection section is coated with the negative electrode active material layer. The negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper. The negative electrode active material layer includes the negative electrode active material. The negative electrode active material can be carbon or silicon, etc.

[0072] An electrode assembly is the component in a battery cell where electrochemical reactions occur. An electrode assembly includes a stacked positive electrode, a negative electrode, and an interlayer dielectric layer. Typically, an interlayer dielectric layer is provided between the positive and negative electrode. The interlayer dielectric layer may include a solid electrolyte layer. When the electrode assembly formed by stacking the positive electrode, solid electrolyte layer, and negative electrode is applied to a battery cell, the battery cell is a solid-state battery, thus eliminating the need for liquid electrolyte filling within the battery cell. Exemplarily, the solid electrolyte layer may be a sulfide-based solid electrolyte, an oxide-based solid electrolyte, or a polymer-based solid electrolyte.

[0073] For example, the portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly. The portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends of the main body. 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.

[0074] In a stacked state of positive electrode, solid electrolyte layer and negative electrode, the positive electrode, solid electrolyte layer and negative electrode are pressed to ensure tight contact between each layer of the positive electrode, solid electrolyte layer and negative electrode.

[0075] In related technologies, the battery cell is a solid-state battery. During the battery cell processing, electrolyte material is directly coated onto the active material layer of the electrode and dried and cured to form a solid electrolyte layer. Due to the relatively uneven surface of the active material layer and the relatively small thickness of the solid electrolyte layer, the poor surface unevenness of the active material layer leads to inconsistent thickness of the solid electrolyte layer, thus affecting the electrical performance of the electrode assembly. Furthermore, during battery cell processing, the electrode is pressed, and the active material layer at the edge of the electrode may peel off. This peeled active material layer can cause a short circuit between electrodes with opposite polarities. To reduce the possibility of short circuits between electrodes with opposite polarities, one method is to make the area of ​​the positive electrode smaller than that of the negative electrode. The area of ​​the positive electrode is smaller than that of the solid electrolyte layer. First, an insulating material is directly coated onto the edge of the positive electrode to form an insulating layer surrounding it. Then, the positive electrode with the insulating layer, the solid electrolyte layer, and the negative electrode are stacked together. The stacked positive electrode, solid electrolyte layer, and negative electrode are then pressed. Insulating layers can help reduce the likelihood of short circuits between electrodes with opposite polarities. However, due to variations in the thickness consistency of the solid electrolyte, the adhesion between the insulating layer and the solid electrolyte varies, resulting in gaps between them. This reduces the insulation effect of the insulating layer and affects the safety of the electrode assembly.

[0076] To mitigate the impact on the electrical performance and safety of electrode assemblies, electrolyte materials can be placed on an insulating substrate during the electrode assembly manufacturing process. This ensures that the solid electrolyte layer has a uniform thickness after molding and that the solid electrolyte layer adheres tightly to the insulating layer, thereby improving the electrical performance and safety of the electrode assembly.

[0077] Based on the above considerations, to alleviate the problem of compromised electrical performance and safety of electrode assemblies, the inventors, after in-depth research, designed a manufacturing method for electrode assemblies. An electrolyte material is deposited on a formed insulating substrate. The electrolyte material is then cured to form a solid electrolyte layer. Part of the insulating material on the insulating substrate is removed, leaving an insulating layer. The insulating layer and the solid electrolyte layer form a composite structure. This composite structure is used to connect with the first and second electrodes. The insulating substrate itself has good surface flatness, which helps improve the thickness uniformity of the solid electrolyte layer and enhances the electrical performance of the electrode assembly. The insulating layer and the solid electrolyte layer are tightly bonded, reducing the possibility of gaps between them and improving the safety of the electrode assembly.

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

[0079] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0080] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0081] See Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. The battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12. For example, this is for the power needs of vehicle 1 during starting, navigation, and driving.

[0082] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0083] To meet different power demands, the battery device 10 may include multiple battery cells. A battery cell is the smallest unit that makes up a battery module or battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery device mentioned in this application includes a battery module or battery pack. Multiple battery cells can be connected in series, parallel, or a combination thereof. A combination thereof refers to a mix of series and parallel connections. In the embodiments of this application, multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into a battery module, and then the battery modules can be assembled into a battery pack.

[0084] See Figure 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.

[0085] The housing 10a can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10a can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0086] The housing 10a is used to accommodate individual battery cells, and the housing 10a can have various structures. In some embodiments, the housing 10a may include a first housing portion 10b and a second housing portion 10c. The first housing portion 10b and the second housing portion 10c overlap each other. The first housing portion 10b and the second housing portion 10c together define a receiving space for accommodating the individual battery cells. The second housing portion 10c may be a hollow structure with one open end. In some embodiments, the first housing portion 10b is a plate-like structure. The first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. In some embodiments, both the first housing portion 10b and the second housing portion 10c may also be hollow structures with one open side. The open side of the first housing portion 10b overlaps the open side of the second housing portion 10c to form a housing 10a with a receiving space. Of course, the first housing portion 10b and the second housing portion 10c can have various shapes, such as cylinders, cuboids, etc.

[0087] To improve the sealing performance after the first housing part 10b and the second housing part 10c are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 10b and the second housing part 10c.

[0088] In some embodiments, the first housing portion 10b covers the top of the second housing portion 10c. The first housing portion 10b may also be referred to as the upper housing cover, and the second housing portion 10c may also be referred to as the lower housing.

[0089] In the battery device 10, there can be one or more battery cells. When there are multiple battery cells, they can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or in a mixed configuration and then housed within the housing 10a. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery module. Multiple battery modules can then be connected in series, parallel, or in a mixed configuration to form a whole and housed within the housing 10a.

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

[0091] Multiple battery cells 30 in the battery module 20 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 30 in the battery module 20.

[0092] In this embodiment, the battery cell 30 may include a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this embodiment is not limited thereto. The battery cell 30 may be flat, cuboid, or other shapes, and this embodiment is not limited thereto either. However, for the sake of brevity, the following embodiment uses a cuboid battery cell 30 as an example for illustration.

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

[0094] End cap 40 refers to a component that covers the opening of housing 50 to isolate the internal environment of battery cell 30 from the external environment. Exemplarily, the shape of end cap 40 can be adapted to the shape of housing 50 to fit the housing 50. Exemplarily, end cap 40 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 40 is not easily deformed under pressure or impact, enabling battery cell 30 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 41 can be provided on end cap 40. Electrode terminals 41 can be used for electrical connection with electrode assembly 60 for outputting or inputting electrical energy into battery cell 30.

[0095] In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold. The end cap 40 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40. The insulating component can be used to isolate the electrical connection components within the housing 50 from the end cap 40 to reduce the risk of short circuits. Exemplarily, the insulating component can be plastic, rubber, etc.

[0096] The housing 50 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 30. The formed internal environment can accommodate the electrode assembly 60 and other components. The housing 50 and the end cap 40 can be independent components. An opening can be provided on the housing 50, and the end cap 40 closes the opening to form the internal environment of the battery cell 30. Alternatively, the end cap 40 and the housing 50 can be integrated. Specifically, the end cap 40 and the housing 50 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 50, the end cap 40 closes the housing 50. The housing 50 can have various shapes and sizes, such as cuboid, hexagonal prism, etc. Specifically, the shape of the housing 50 can be determined according to the specific shape and size of the electrode assembly 60. The material of the housing 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0097] See Figure 5 As shown, this application embodiment provides a method for manufacturing an electrode assembly 60, which includes:

[0098] Provide insulating substrate 100;

[0099] An electrolyte material is disposed on an insulating substrate 100 and a solid electrolyte layer 63 is formed thereon. The solid electrolyte layer 63 has a first surface 631 and a second surface 632 opposite to each other. The insulating substrate 100 is connected to the second surface 632.

[0100] The middle region of the insulating substrate 100 is removed to form an insulating layer 64 with a receiving space 641, and the second surface 632 is exposed in the receiving space 641.

[0101] A first electrode 61 is provided, which is disposed on the first surface 631 and is in contact with the solid electrolyte layer 63.

[0102] A second electrode 62 is provided, at least a portion of which is located within a receiving space 641. The second electrode 62 is disposed on a second surface 632 and is in contact with a solid electrolyte layer 63.

[0103] The insulating substrate 100 of this embodiment has good insulating properties. The insulating substrate 100 can be a single sheet film structure. The insulating substrate 100 can be manufactured by extrusion or calendering processes to achieve good surface flatness. The surface flatness of the insulating substrate 100 can be characterized by its surface roughness.

[0104] An electrolyte material is disposed on an insulating substrate 100, and the electrolyte material can cover the surface of the insulating substrate 100. The electrolyte material itself has adhesive force, which allows the electrolyte material to adhere to the insulating substrate 100, and the solid electrolyte layer 63 after molding is not easily separated from the insulating substrate 100.

[0105] The insulating material in the central region of the insulating substrate 100 is removed, while the insulating material in the edge regions is retained. Exemplarily, the insulating material can be removed using a laser removal process or machining. The insulating material in the edge regions forms an insulating layer 64. The insulating layer 64 extends circumferentially along the solid electrolyte layer 63. Exemplarily, the insulating layer 64 can be a closed annular structure. The solid electrolyte layer 63 can be observed through the accommodating space 641 of the insulating layer 64. There is essentially no electrochemical reaction between the solid electrolyte layer 63 and the insulating layer 64.

[0106] After the first electrode 61 is disposed on the first surface 631, the first electrode 61 and the solid electrolyte layer 63 need to be pressed together to ensure close contact between them. This ensures that the first electrode 61 and the first surface 631 of the solid electrolyte layer 63 are in good, flat contact, providing an ion transport channel. Similarly, after the second electrode 62 is disposed on the second surface 632, the second electrode 62 and the solid electrolyte layer 63 need to be pressed together to ensure close contact between them. This ensures that the second electrode 62 and the second surface 632 of the solid electrolyte layer 63 are in good, flat contact, providing an ion transport channel.

[0107] The manufacturing method of the electrode assembly 60 in this application embodiment involves providing an insulating substrate 100 as a base, then depositing an electrolyte material on the insulating substrate 100 and forming a solid electrolyte layer 63. After removing the material in the middle region of the insulating substrate 100, an insulating layer 64 is formed. Because the insulating substrate 100 itself has good surface flatness, the solid electrolyte layer 63 formed on the insulating substrate 100 has good thickness consistency, uniform thickness, and good surface flatness. This facilitates good electrochemical reaction performance between the first electrode 61, the solid electrolyte layer 63, and the second electrode 62, thereby improving the electrical performance of the electrode assembly 60.

[0108] The electrolyte material itself has adhesive properties, allowing it to bond with the insulating substrate 100. The formed solid electrolyte layer 63 is not easily separated from the insulating substrate 100. The formed insulating layer 64 provides insulation and isolation to the edges of the second electrode 62 in the circumferential direction. The tight fit between the formed insulating layer 64 and the solid electrolyte layer 63 reduces the possibility of gaps between them, improving the insulation effect of the insulating layer 64. This, in turn, reduces the possibility of short circuits caused by burrs penetrating gaps at the electrode edges, thus enhancing the safety of the electrode assembly 60.

[0109] The molding method of the solid electrolyte layer 63 and insulating layer 64 in this embodiment can replace the method of coating insulating material or applying adhesive to the electrode in related technologies. The insulating substrate 100 can simultaneously serve as a support substrate and form the insulating layer 64, which helps to simplify the processing technology and make efficient use of insulating materials.

[0110] See also some of the possible implementation methods. Figure 6 As shown, the solid electrolyte layer 63 and the insulating layer 64 can form a composite structure. A first electrode 61, a second electrode 62, and the composite structure form an electrode assembly 60. At least a portion of the second electrode 62 is located within the receiving space 641 of the insulating layer 64.

[0111] See also some of the possible implementation methods. Figure 7 As shown, the insulating layer 64 and the solid electrolyte layer 63 form a first composite structure 110. A first composite structure 110 is disposed on each side of the first electrode 61. A second electrode 62 is disposed on the solid electrolyte layer 63 of one first composite structure 110. One first electrode 61, two first composite structures 110, and one second electrode 62 can form a second composite structure 120. Two or more second composite structures 120 are stacked to form an electrode assembly 60.

[0112] In some feasible implementations, the surface roughness of the insulating substrate 100 can range from 0.04 micrometers (μm) to 2.0 micrometers. In some examples, the surface roughness of the insulating substrate 100 can be 0.05 micrometers, 0.06 micrometers, 0.07 micrometers, 0.08 micrometers, 0.09 micrometers, 0.1 micrometers, 0.3 micrometers, 0.5 micrometers, 0.7 micrometers, 0.9 micrometers, 1.0 micrometers, 1.2 micrometers, 1.4 micrometers, 1.6 micrometers, or 1.8 micrometers.

[0113] The smaller the surface roughness of the insulating substrate 100, the higher its surface flatness, resulting in greater thickness uniformity and better surface flatness of the formed solid electrolyte layer 63. When the surface roughness of the insulating substrate 100 is less than 0.04 micrometers, the processing difficulty of the insulating substrate 100 becomes relatively high, leading to increased processing costs. When the surface roughness of the insulating substrate 100 is greater than 2.0 micrometers, the surface flatness of the insulating substrate 100 decreases, affecting the thickness uniformity of the solid electrolyte layer 63. In this embodiment, the surface roughness of the insulating substrate 100 is set between 0.04 micrometers and 2.0 micrometers, which helps to reduce the possibility of the above-mentioned problems.

[0114] See also some of the possible implementation methods. Figure 6 As shown, the thickness D of the insulating layer 64 is less than the thickness H of the second electrode 62. After the second electrode 62 is disposed on the second surface 632, the second electrode 62 and the solid electrolyte layer 63 need to be pressed. There is a height difference between the surface of the insulating layer 64 and the surface of the second electrode 62. During the pressing process, the insulating layer 64 is less likely to bear pressure, reducing the possibility that the pressure on the second electrode 62 may be too low due to the insulating layer 64 bearing pressure, thereby reducing the possibility that the adhesion between the second electrode 62 and the solid electrolyte layer 63 may be deviated due to the pressure on the second electrode 62 being too low. Deviation in the adhesion between the second electrode 62 and the solid electrolyte layer 63 will affect the electrical performance between the second electrode 62 and the solid electrolyte layer 63.

[0115] In some examples, the thickness of the second electrode 62 itself can range from 100 micrometers to 650 micrometers. The thickness of the solid electrolyte layer 63 can range from 5 micrometers to 400 micrometers.

[0116] See in some examples Figure 6 and Figure 7 As shown, the thickness of the insulating layer 64 is D, and the thickness of the second electrode 62 is H, where 0 < D < H / 2.

[0117] An insulating layer 64 and a solid electrolyte layer 63 form a first composite structure 110. A second electrode 62 is disposed on the solid electrolyte layer 63 of one first composite structure 110. A first electrode 61, two first composite structures 110, and a second electrode 62 form a second composite structure 120. Two or more second composite structures 120 can be stacked to form an electrode assembly 60. In the electrode assembly 60, a portion of the first electrodes 61 have solid electrolyte layers 63 disposed on both sides, and the insulating layers 64 disposed on each of the two solid electrolyte layers 63 face each other. Since D < H / 2, during the pressing process, the two insulating layers 64 facing each other are less likely to come into contact and press against each other. On the one hand, this reduces the possibility of insufficient pressure on the second electrode 62 due to the two insulating layers 64 coming into contact and pressing against each other, thereby reducing the possibility of deviation in the tightness of the adhesion between the second electrode 62 and the solid electrolyte layer 63 due to insufficient pressure on the second electrode 62. On the other hand, it reduces the possibility of compression deformation of the insulating layers 64 due to the two insulating layers 64 coming into contact and pressing against each other. If the insulating layer 64 is compressed and deformed, it will squeeze the second electrode 62, and there is a possibility that the active material of the second electrode 62 may peel off or fall off due to pressure.

[0118] See also some of the possible implementation methods. Figure 6 As shown, the second electrode 62 includes a second current collector 621 and a second active material layer 622. The second active material layer 622 is disposed on the second current collector 621. The thickness of the second active material layer 622 is greater than the thickness of the insulating layer 64. The second current collector 621 is a metal structural component. The second current collector 621 is located outside the receiving space 641 of the insulating layer 64. The second current collector 621 will not come into contact with the insulating layer 64. During the process of placing the second electrode 62 into the receiving space 641 and during the pressing process, the second current collector 621 will not come into contact with the insulating layer 64. This helps to reduce the possibility of positional interference between the insulating layer 64 and the tabs on the second current collector 621 due to contact, and also helps to reduce the possibility of scratches or damage to the insulating layer 64 caused by the second current collector 621 scraping against it.

[0119] In some examples, the first electrode 61 can be a negative electrode. The first electrode 61 may include a first current collector 611 and a first active material layer 612. The first active material layer 612 is disposed on the first current collector 611. The first current collector 611 is a metallic structure. Exemplarily, the material of the first current collector 611 can be copper. The first active material layer 612 includes a negative electrode active material. The negative electrode active material can be carbon or silicon, etc.

[0120] The second electrode 62 can be a positive electrode. The material of the second current collector 621 can be aluminum. The second active material layer 622 includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0121] In some examples, the thickness of the first current collector 611 can range from 4 micrometers to 40 micrometers. The thickness of the first active material layer 612 can range from 1 micrometer to 100 micrometers. The thickness of the second current collector 621 can range from 4 micrometers to 60 micrometers. The thickness of the second active material layer 622 can range from 10 micrometers to 450 micrometers.

[0122] See also some of the possible implementation methods. Figure 6 As shown, the insulating layer 64, facing the inner wall 642 of the receiving space 641, contacts the side surface of the second electrode 62. The contact between the insulating layer 64 and the second electrode 62 ensures there are no gaps between them. During the manufacturing process of the second electrode 62, there is a possibility of burrs forming at its edges. The insulating layer 64 can block these burrs, reducing the likelihood of a short circuit between the first electrode 61 and the second electrode 62 due to burrs connecting them, thus improving the safety of the electrode assembly 60.

[0123] The insulating layer 64 can support the edge region of the second electrode 62. The second active material layer 622 of the second electrode 62 is located within the receiving space 641 of the insulating layer 64. During the pressing process, the insulating layer 64 can limit the outward extension of the second active material layer 622 under pressure, reducing the possibility of the second active material layer 622 cracking or peeling under pressure. Exemplarily, the insulating layer 64 is a ring-shaped structure surrounding the second electrode 62, which is beneficial to improving the insulation consistency of the second electrode 62 in the circumferential direction. Exemplarily, the insulating layer 64 can be a rectangular ring structure. The solid electrolyte layer 63, the first electrode 61, and the second electrode 62 can all be rectangular.

[0124] In some possible implementations, the second surface 632 has a surface area exposed in the receiving space 641. The projection of the second electrode 62 onto the solid electrolyte layer 63 overlaps with the surface area. The projected area of ​​the second electrode 62 onto the solid electrolyte layer 63 is the same as the area of ​​the surface area.

[0125] The projected area of ​​the second electrode 62 on the solid electrolyte layer 63 is smaller than the area of ​​the second surface 632. The sum of the projected area of ​​the second electrode 62 on the solid electrolyte layer 63 and the projected area of ​​the insulating layer 64 on the solid electrolyte layer 63 can be equal to the area of ​​the second surface 632.

[0126] The projection of the second electrode 62 onto the solid electrolyte layer 63 overlaps with the surface area. The inner wall 642 of the insulating layer 64 facing the receiving space 641 can be a vertical wall, which facilitates the placement of the second electrode 62 within the receiving space 641.

[0127] In some examples, the first electrode 61 can be a negative electrode, and the second electrode 62 can be a positive electrode. The projected area of ​​the first electrode 61 on the solid electrolyte layer 63 can be equal to the area of ​​the first surface 631. The projected area of ​​the second electrode 62 on the solid electrolyte layer 63 is smaller than that of the first electrode 61 on the solid electrolyte layer 63, which helps to reduce the possibility of lithium plating on the second electrode 62.

[0128] See also some of the possible implementation methods. Figure 6 As shown, the width W of the insulating layer 64 ranges from 3 mm to 5 mm, which gives the insulating layer 64 good structural strength and insulation performance. At the same time, it can also help reduce the occupancy rate of the insulating layer 64 on the second surface 632 of the solid electrolyte layer 63, so that the contact area between the second surface 632 and the second electrode 62 is relatively large, which is beneficial to improving the energy density of the electrode assembly 60.

[0129] In some examples, the width W of the insulating layer 64 can be 3.5 mm, 4.0 mm, or 4.5 mm.

[0130] In some feasible ways, the material of the insulating substrate 100 includes plastic. Plastic has the property of being easy to process and mold, which reduces the processing difficulty of the insulating substrate 100, and at the same time, it is relatively easy to mold the insulating substrate 100 with a relatively small surface roughness, so that the insulating substrate 100 itself has good surface flatness.

[0131] In some examples, the material of the insulating substrate 100 may include, but is not limited to, at least one of the following: a copolymer of tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride (THV), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyethylene (PE), perfluoroalkoxyethylene (PFA), tetrafluoroethylene (PTFE), polyvinyl fluoride (PVF), and ethylene-tetrafluoroethylene copolymer (ETFE).

[0132] In some feasible ways, an electrolyte material is coated onto an insulating substrate 100 using a coating process to form a solid electrolyte layer 63.

[0133] The coating process allows for precise control of the electrolyte material coating amount. Therefore, after coating the electrolyte material onto the insulating substrate 100, this process improves the thickness uniformity and surface smoothness of the electrolyte material. By using an insulating substrate 100 with good surface smoothness as the base and employing a coating process with precisely controllable coating thickness, the thickness uniformity and surface smoothness of the formed solid electrolyte layer 63 can be effectively improved.

[0134] In some examples, the coating process includes, but is not limited to, transfer coating and extrusion coating.

[0135] See Figure 4 and Figure 6 As shown, this application embodiment provides a battery cell 30, which includes a housing 50 and an electrode assembly 60. The electrode assembly 60 can be manufactured using the above-described manufacturing method for the electrode assembly 60. The electrode assembly 60 is disposed within the housing 50. The electrode assembly 60 includes a first electrode 61, a solid electrolyte layer 63, a second electrode 62, and an insulating layer 64. The first electrode 61, the solid electrolyte layer 63, and the second electrode 62 are stacked on top of each other. The solid electrolyte layer 63 has a first surface 631 and a second surface 632. The first electrode 61 is disposed on the first surface 631. The second electrode 62 and the insulating layer 64 are disposed on the second surface 632. The insulating layer 64 extends circumferentially along the second electrode 62. The thickness of the insulating layer 64 is less than the thickness of the second electrode 62.

[0136] After the second electrode 62 is disposed on the second surface 632, the second electrode 62 and the solid electrolyte layer 63 need to be pressed together. There is a height difference between the surface of the insulating layer 64 and the surface of the second electrode 62. During the pressing process, the insulating layer 64 is less likely to bear pressure, reducing the possibility of insufficient pressure on the second electrode 62 due to the insulating layer 64 bearing pressure. This reduces the possibility of deviation in the bonding tightness between the second electrode 62 and the solid electrolyte layer 63 due to insufficient pressure on the second electrode 62. Deviation in the bonding tightness between the second electrode 62 and the solid electrolyte layer 63 will affect the electrical performance between them.

[0137] See also some of the possible implementation methods. Figure 6 As shown, the thickness of the insulating layer 64 is D, and the thickness of the second electrode 62 is H, where 0 < D < H / 2.

[0138] See Figure 7As shown, the insulating layer 64 and the solid electrolyte layer 63 form a first composite structure 110. A second electrode 62 is disposed on the solid electrolyte layer 63 of one first composite structure 110. One first electrode 61, two first composite structures 110, and one second electrode 62 form a second composite structure 120. Two or more second composite structures 120 can be stacked to form an electrode assembly 60. In the electrode assembly 60, when a portion of the first electrode 61 has a solid electrolyte layer 63 disposed on both sides, the insulating layers 64 disposed on each of the two solid electrolyte layers 63 face each other. Since D < H / 2, during the pressing process, the two insulating layers 64 facing each other are less likely to come into contact and press against each other. On the one hand, this reduces the possibility of insufficient pressure on the second electrode 62 due to the two insulating layers 64 coming into contact and pressing against each other, thereby reducing the possibility of deviation in the tightness of the adhesion between the second electrode 62 and the solid electrolyte layer 63 due to insufficient pressure on the second electrode 62. On the other hand, it reduces the possibility of compression deformation of the insulating layers 64 due to the two insulating layers 64 coming into contact and pressing against each other. If the insulating layer 64 is compressed and deformed, it will squeeze the second electrode 62, and there is a possibility that the active material of the second electrode 62 may peel off or fall off due to pressure.

[0139] See also some of the possible implementation methods. Figure 6 As shown, the second electrode 62 includes a second current collector 621 and a second active material layer 622. The second active material layer 622 is disposed on the second current collector 621. The thickness of the second active material layer 622 is greater than the thickness of the insulating layer 64. The second current collector 621 is a metal structural component. The second current collector 621 is located outside the receiving space 641 of the insulating layer 64. The second current collector 621 will not come into contact with the insulating layer 64. During the process of placing the second electrode 62 into the receiving space 641 and during the pressing process, the second current collector 621 will not come into contact with the insulating layer 64, reducing the possibility of scratches or damage to the insulating layer 64 caused by the second current collector 621 scraping against it.

[0140] This application provides a battery device 10, which includes a battery cell 30 according to any of the above embodiments.

[0141] According to some embodiments of this application, this application also provides an electrical device including a battery device 10 of any of the above-described 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.

[0142] 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. A method for manufacturing an electrode assembly, characterized in that, include: Provide insulating substrate; An electrolyte material is disposed on the insulating substrate to form a solid electrolyte layer, the solid electrolyte layer having a first surface and a second surface opposite to each other, and the insulating substrate being connected to the second surface; The middle region of the insulating substrate is removed to form an insulating layer with a receiving space, and the second surface is exposed in the receiving space; A first electrode is provided, the first electrode being disposed on the first surface; A second electrode is provided, at least a portion of which is located within the receiving space, and the second electrode is disposed on the second surface.

2. The method for manufacturing the electrode assembly according to claim 1, characterized in that, The surface roughness of the insulating substrate ranges from 0.04 micrometers to 2.0 micrometers.

3. The method for manufacturing the electrode assembly according to claim 1 or 2, characterized in that, The thickness of the insulating layer is less than the thickness of the second electrode.

4. The method for manufacturing the electrode assembly according to claim 3, characterized in that, The thickness of the insulating layer is D, and the thickness of the second electrode is H, where 0 < D < H / 2.

5. The method for manufacturing the electrode assembly according to claim 4, characterized in that, The second electrode includes a second current collector and a second active material layer, the second active material layer being disposed on the second current collector, and the thickness of the second active material layer being greater than the thickness of the insulating layer.

6. The method for manufacturing an electrode assembly according to any one of claims 1 to 5, characterized in that, The insulating layer contacts the side surface of the second electrode plate on the inner wall of the receiving space.

7. The method for manufacturing an electrode assembly according to any one of claims 1 to 6, characterized in that, The second surface has a surface area exposed in the receiving space, the projection of the second electrode on the solid electrolyte layer overlaps with the surface area, and the projected area of ​​the second electrode on the solid electrolyte layer is the same as the area of ​​the surface area.

8. A method for manufacturing an electrode assembly according to any one of claims 1 to 7, characterized in that, The width W of the insulating layer ranges from 3 mm to 5 mm.

9. A method for manufacturing an electrode assembly according to any one of claims 1 to 8, characterized in that, The insulating substrate is made of plastic.

10. A method for manufacturing an electrode assembly according to any one of claims 1 to 9, characterized in that, The electrolyte material is coated onto the insulating substrate using a coating process to form the solid electrolyte layer.

11. A method for manufacturing an electrode assembly according to any one of claims 1 to 10, characterized in that, The first electrode is the negative electrode, and the second electrode is the positive electrode.

12. A method for manufacturing an electrode assembly according to any one of claims 1 to 11, characterized in that, The insulating layer and the solid electrolyte layer form a first composite structure. A first composite structure is disposed on each side of the first electrode. A first electrode, two first composite structures and a second electrode form a second composite structure. Two or more second composite structures are stacked to form an electrode assembly.

13. A single battery cell, characterized in that, include: case; An electrode assembly is disposed within the housing. The electrode assembly includes a first electrode, a solid electrolyte layer, a second electrode, and an insulating layer. The first electrode, the solid electrolyte layer, and the second electrode are stacked on top of each other. The solid electrolyte layer has a first surface and a second surface. The first electrode is disposed on the first surface, and the second electrode and the insulating layer are disposed on the second surface. The insulating layer extends circumferentially along the second electrode, and the thickness of the insulating layer is less than the thickness of the second electrode.

14. The battery cell according to claim 13, characterized in that, The thickness of the insulating layer is D, and the thickness of the second electrode is H, where 0 < D < H / 2.

15. The battery cell according to claim 14, characterized in that, The second electrode includes a second current collector and a second active material layer, the second active material layer being disposed on the second current collector, and the thickness of the second active material layer being greater than the thickness of the insulating layer.

16. A battery device, characterized in that, Includes the battery cell as described in claim 14 or 15.

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

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