Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell and an electrode assembly, the electrode assembly comprises a pole piece, a solid-state electrolyte and a first insulation component, the pole piece comprises a first pole piece and a second pole piece, the first pole piece comprises a first pole piece main body and a first pole lug, the first pole lug is connected to one side of the first pole piece main body along a first direction, the second pole piece comprises a second pole piece main body and a second pole lug, the second pole lug is connected to one side of the second pole piece main body along the first direction, the first insulation component comprises a first insulator and a second insulator, the first insulator is formed on the surface of the first pole lug along the thickness direction of the pole piece and is arranged at one end of the second pole piece main body close to the first pole lug along the first direction, and the second insulator is formed on the surface of the second pole lug along the thickness direction of the pole piece and is arranged at one end of the first pole piece main body close to the second pole lug along the first direction. According to the application, the reliability of the battery monomer can be effectively improved.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] In the development of battery technology, improving the reliability of individual battery cells is a continuous research direction. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, which includes a casing and an electrode assembly. The electrode assembly is housed within the casing and includes an electrode sheet, a solid electrolyte, and a first insulating component. The electrode sheet includes a first electrode sheet and a second electrode sheet, which are staggered along the thickness direction of the electrode sheet and have opposite polarities. The solid electrolyte is disposed between the first electrode sheet and the second electrode sheet.

[0006] The first electrode includes a first electrode body and a first electrode tab, the first electrode tab being connected to one side of the first electrode body along a first direction. The second electrode includes a second electrode body and a second electrode tab, the second electrode tab being connected to one side of the second electrode body along a first direction, the first direction being perpendicular to the thickness direction of the electrode.

[0007] The first insulating component includes a first insulator and a second insulator. The first insulator is disposed at one end of the second electrode body along the first direction near the first electrode tab and is used to insulate the first electrode tab and the second electrode body. The second insulator is disposed at one end of the first electrode body along the first direction near the second electrode tab and is used to insulate the second electrode tab and the first electrode body.

[0008] The first insulator is formed on the surface of the first tab along the thickness direction of the electrode sheet, and the second insulator is formed on the surface of the second tab along the thickness direction of the electrode sheet.

[0009] The above technical solution introduces a first insulating component, which isolates and protects the first tab and the second electrode body, reducing the risk of short circuits caused by the overlap of the first tab and the second electrode body. Similarly, a second insulator isolates and protects the second tab and the first electrode body, reducing the risk of short circuits caused by their overlap. This effectively improves the reliability and yield of the battery cell. Furthermore, it not only reduces the difficulty of setting up the first and second insulators but also improves the structural compactness of the electrode assembly, contributing to an increase in the energy density of the battery cell.

[0010] In some embodiments of the first aspect, the projection of the first insulator along the first direction covers the projection of the second electrode body along the first direction; and / or, the projection of the second insulator along the first direction covers the projection of the first electrode body along the first direction.

[0011] This design allows the first insulator to completely cover the end of the second electrode body near the first tab along the first direction, thereby further improving the isolation and protection effect of the first insulator on the first tab and the second electrode body. Similarly, this design allows the second insulator to completely cover the end of the first electrode body near the second tab along the first direction, thereby further improving the isolation and protection effect of the second insulator on the second tab and the first electrode body.

[0012] In some embodiments of the first aspect, the first electrode body includes a first current collector, a first active material layer and a second active material layer, the first active material layer and the second active material layer are respectively coated on two opposite sides of the first current collector along the thickness direction, and a first insulator is connected to the side of the first electrode tab close to the first active material layer and protrudes from the side surface of the first active material layer opposite to the first current collector.

[0013] The second electrode body includes a second current collector, a third active material layer, and a fourth active material layer. The third and fourth active material layers are respectively connected to opposite surfaces of the second current collector along its thickness direction. A second insulator is connected to the side of the second electrode tab closest to the third active material layer and protrudes from the side surface of the third active material layer opposite to the second current collector. The first and third active material layers are arranged opposite to each other, as are the second and fourth active material layers.

[0014] The above technical solution, by providing a first insulator only on one side of the first electrode tab along the thickness direction and a second insulator only on one side of the second electrode tab along the thickness direction, enables the first electrode and the second electrode to form a splicing assembly structure, which helps to simplify the manufacturing process of the electrode assembly and reduce costs.

[0015] In some embodiments of the first aspect, the projection of the second active material layer along the thickness direction overlaps with the projection of the first insulator along the thickness direction; and / or, the projection of the fourth active material layer along the thickness direction overlaps with the projection of the second insulator along the thickness direction.

[0016] This allows the second active material layer to fill the gap between the first insulator and the first tab to a certain extent, improving the overall structural compactness and stability of the electrode assembly. Similarly, the fourth active material layer allows the fourth active material layer to fill the gap between the second insulator and the second tab to a certain extent, further improving the overall structural compactness and stability of the electrode assembly.

[0017] In some embodiments of the first aspect, the first dimension L1 of the first active material layer along the first direction, the second dimension L2 of the second active material layer along the first direction, and the third dimension L3 of the first insulator along the first direction satisfy the relationship: L2≤L1+L3.

[0018] The above technical solution can, to a certain extent, avoid the situation where the size of the second active material layer along the first direction is too large, resulting in the effective size of the first electrode tab being too small, thereby reducing the processing and assembly difficulty of the electrode assembly.

[0019] In some embodiments of the first aspect, the first dimension L1 satisfies the relationship: 20mm≤L1≤2000mm, and the third dimension L3 satisfies the relationship: 15μm≤L3≤2000μm.

[0020] The above technical solution, by setting the first dimension L1 and the third dimension L3 within the above range, can reduce the impact of the first insulator on the energy density of the battery cell while ensuring that the first insulator has a reliable insulating spacing effect.

[0021] In some embodiments of the first aspect, the first dimension L1 satisfies the relationship: 40mm ≤ L1 ≤ 1000mm, and the third dimension L3 satisfies the relationship: 30μm ≤ L3 ≤ 1000μm. This can further improve the balance between the reliability and energy density of the battery cell.

[0022] In some embodiments of the first aspect, the fourth dimension L4 of the third active material layer along the first direction, the fifth dimension L5 of the fourth active material layer along the first direction, and the sixth dimension L6 of the second insulator along the first direction satisfy the relationship: L5≤L4+L6.

[0023] The above technical solution can, to a certain extent, avoid the situation where the size of the fourth active material layer along the first direction is too large, resulting in the effective size of the second electrode being too small, thereby reducing the processing and assembly difficulty of the electrode assembly.

[0024] In some embodiments of the first aspect, the fourth dimension L4 satisfies the relationship: 20mm≤L4≤2000mm, and the sixth dimension L6 satisfies the relationship: 15μm≤L6≤2000μm.

[0025] The above technical solution, by setting the fourth dimension L4 and the sixth dimension L6 within the above range, can reduce the impact of the second insulator on the energy density of the battery cell while ensuring that the second insulator has a reliable insulating spacing effect.

[0026] In some embodiments of the first aspect, the fourth dimension L4 satisfies the relationship: 40mm ≤ L4 ≤ 1000mm, and the sixth dimension L6 satisfies the relationship: 30μm ≤ L6 ≤ 1000μm. This can further improve the balance between the reliability and energy density of the battery cell.

[0027] In some embodiments of the first aspect, the first dimension L1 of the first active material layer along the first direction and the fourth dimension L4 of the third active material layer along the first direction satisfy the relationship: -2mm≤L1-L4≤2mm.

[0028] The above technical solution reduces the gaps inside the electrode assembly and improves the reliability of the electrode assembly by setting the difference between the first dimension L1 and the fourth dimension L4 within the above range.

[0029] In some embodiments of the first aspect, the first dimension L1 and the fourth dimension L4 satisfy the relationship: -0.5mm≤L1-L4≤0.5mm.

[0030] This can further reduce the gaps inside the electrode assembly, thereby further improving the reliability of the electrode assembly.

[0031] In some embodiments of the first aspect, the surface of the first insulator away from the first current collector along the thickness direction is flush with the surface of the fourth active material layer away from the second current collector along the thickness direction; and / or, the surface of the second insulator away from the second current collector along the thickness direction is flush with the surface of the first active material layer away from the first current collector along the thickness direction.

[0032] It can effectively improve the structural consistency and compactness of the electrode assembly, which helps to further improve the reliability of the electrode assembly.

[0033] In some embodiments of the first aspect, the solid electrolyte includes a first electrolyte layer and a second electrolyte layer, which are respectively coated on opposite sides of the second electrode body along the thickness direction.

[0034] By directly coating the solid electrolyte onto the second electrode body, the fabrication process of the electrode assembly can be simplified, which helps to reduce costs.

[0035] In some embodiments of the first aspect, the first electrode and the second electrode are wound along a winding direction, and the first electrode tab and the second electrode tab are arranged opposite to each other along a first direction. The first electrode tab is wound along the winding direction and includes multiple turns of the first electrode tab layer, the second electrode tab is wound along the winding direction and includes multiple turns of the second electrode tab layer, a first insulator is disposed between two adjacent turns of the first electrode tab layer, and a second insulator is disposed between two adjacent turns of the second electrode tab layer.

[0036] The above technical solution can greatly reduce the risk of short circuits in the wound electrode assembly, improve the shortcomings of solid-state battery cells with wound electrode assemblies, and effectively improve the economic benefits of solid-state battery cells with wound electrode assemblies.

[0037] In some embodiments of the first aspect, the battery cell further includes a support member, with a first electrode and a second electrode wound around the support member.

[0038] The support component is used to support the first and second electrodes to reduce the risk of inward deformation or collapse of the first and second electrodes under external force, thereby improving the reliability of the battery cell.

[0039] In some embodiments of the first aspect, the surface of the first insulator away from the second electrode body along the first direction is flush with the end face of the support member near the first tab along the first direction; and / or, the surface of the second insulator away from the first electrode body along the first direction is flush with the end face of the support member near the second tab along the first direction. This can improve the structural consistency of the electrode assembly and reduce the difficulty of processing or assembling the electrode assembly.

[0040] In some embodiments of the first aspect, both ends of the second electrode extend beyond both ends of the first electrode in the winding direction. The electrode assembly further includes a second insulating member connected to both ends of the first electrode in the winding direction and used to insulate both ends of the first electrode in the winding direction and the second electrode.

[0041] The above technical solution, by introducing a second insulating component, can further reduce the risk of short circuit between the first and second electrodes, thereby further improving the reliability of the battery cell.

[0042] Secondly, this application provides a battery device that includes a battery cell provided in any of the embodiments of the first aspect.

[0043] Thirdly, this application provides an electrical device that includes a battery cell provided in any embodiment of the first aspect or a battery device provided in any embodiment of the second aspect, wherein the battery cell or battery device is used to store or provide electrical energy.

[0044] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0045] 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:

[0046] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0047] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0048] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0049] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in some embodiments of this application;

[0050] Figure 5 This is a cross-sectional schematic diagram of an electrode assembly for a battery cell provided in some embodiments of this application;

[0051] Figure 6 This application provides schematic diagrams of the structure of a first electrode and a second electrode of a battery cell, as shown in some embodiments.

[0052] Figure 7 This is a partial structural diagram of the engagement of a first electrode and a second electrode in a battery cell, provided in some embodiments of this application.

[0053] Figure 8 A cross-sectional schematic diagram of an electrode assembly for a battery cell provided for some embodiments of this application;

[0054] Figure 9 This is a schematic diagram of the winding structure of the first and second electrodes of a battery cell provided in some embodiments of this application.

[0055] The reference numerals in the detailed embodiments are as follows:

[0056] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing; 5b. Second housing; 6. Battery module; 7. Battery cell;

[0057] 10. Outer casing;

[0058] 20. Electrode assembly;

[0059] 21. First electrode; 211. First electrode body; 2111. First current collector; 2112. First active material layer; 2113. Second active material layer; 212. First tab;

[0060] 22. Second electrode; 221. Second electrode body; 2211. Second current collector; 2212. Third active material layer; 2213. Fourth active material layer; 222. Second electrode tab;

[0061] 23. Solid electrolyte; 231. First electrolyte layer; 232. Second electrolyte layer;

[0062] 24. First insulating component; 241. First insulator; 242. Second insulator;

[0063] 30. Supporting components;

[0064] 40. Second insulating component;

[0065] X, thickness direction; Y, first direction; V, winding direction. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0068] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0070] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0072] In this application, "multiple" means two or more (including two).

[0073] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0074] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0075] In the development of battery technology, improving the reliability of individual battery cells is a continuous research direction.

[0076] In related technologies, the solid electrolyte in a solid-state battery cell can provide insulation between the positive and negative electrodes. Therefore, solid-state battery cells typically do not require a separator to isolate the positive and negative electrodes. However, solid electrolytes are sensitive to mechanical stress. During densification processes such as compaction or hot pressing of the electrode assembly, or when the battery cell is subjected to vibration or impact during use, the solid electrolyte located at the edge of the electrode is easily damaged. Simultaneously, under mechanical stress, the positive tab can easily contact the negative current collector of the negative electrode, or vice versa, leading to a short circuit risk and severely impacting the reliability of the battery cell.

[0077] Based on the above considerations, this application designs a battery cell, which includes a casing and an electrode assembly. The electrode assembly is housed within the casing and includes an electrode sheet, a solid electrolyte, and a first insulating component. The electrode sheet includes a first electrode sheet and a second electrode sheet. The first electrode sheet and the second electrode sheet are staggered along the thickness direction of the electrode sheet and have opposite polarities. The solid electrolyte is disposed between the first electrode sheet and the second electrode sheet.

[0078] The first electrode includes a first electrode body and a first electrode tab, the first electrode tab being connected to one side of the first electrode body along a first direction. The second electrode includes a second electrode body and a second electrode tab, the second electrode tab being connected to one side of the second electrode body along a first direction, the first direction being perpendicular to the thickness direction of the electrode.

[0079] The first insulating component includes a first insulator and a second insulator. The first insulator is disposed at one end of the second electrode body along the first direction near the first electrode tab and is used to insulate the first electrode tab and the second electrode body. The second insulator is disposed at one end of the first electrode body along the first direction near the second electrode tab and is used to insulate the second electrode tab and the first electrode body.

[0080] The above technical solution introduces a first insulating component, which can isolate and protect the first tab and the second electrode body to reduce the risk of short circuit caused by the first tab and the second electrode body overlapping; the second insulator can isolate and protect the second tab and the first electrode body to reduce the risk of short circuit caused by the second tab and the first electrode body overlapping, which can effectively improve the reliability of the battery cell and the product yield.

[0081] The battery cells described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment can be devices that use battery devices as a power source or various energy storage systems that use battery devices as energy storage elements. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0082] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0083] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0084] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0085] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0086] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0087] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0088] In some embodiments, the battery device 2 may include one or more battery cell assemblies for providing voltage and capacity.

[0089] A battery cell assembly may include multiple battery cells ( Figure 2 (Not shown), multiple battery cells are connected in series, parallel, or mixed connection through a busbar. Mixed connection refers to multiple battery cells being connected in both series and parallel.

[0090] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0091] As an example, a single battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0092] As an example, a battery cell can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0093] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module 6, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module 6 can be formed by bundling multiple battery cells together with cable ties.

[0094] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 5 and one or more battery cell assemblies housed within the housing 5. As an example, the battery cell assembly may be a battery module 6, which can be housed within the housing by securing the battery module 6 to the housing. Alternatively, the battery cell assembly may be housed within the housing by directly securing multiple battery cells to the housing.

[0095] In some embodiments, the housing 5 is used to house individual battery cells, and the housing 5 can have various structures.

[0096] In some embodiments, the housing 5 may include a first housing 5a and a second housing 5b. The first housing 5a and the second housing 5b are fastened together to form a closed space inside the housing 5 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0097] In some embodiments, the housing 5 may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, forming an enclosed space inside the housing to accommodate individual battery cells. As an example, the frame may include multiple side beams.

[0098] In some embodiments, the housing 5 may be part of the vehicle's chassis structure. For example, a portion of the housing 5 may be at least a portion of the vehicle's floor, or a portion of the housing 5 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0099] In some embodiments, the battery device 2 may be an energy storage device.

[0100] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0101] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0102] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0103] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 7, which are first connected in series, parallel, or a combination of both to form a battery module 6. These battery modules 6 are then connected in series, parallel, or a combination of both to form a whole, which is housed within the casing.

[0104] Multiple battery cells 7 in battery module 6 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of multiple battery cells 7 in battery module 6. There can be one or more busbars, each used to electrically connect at least two battery cells 7.

[0105] This application provides a battery cell that includes a housing and an electrode assembly housed within the housing.

[0106] In some embodiments, the outer casing may be a steel casing, an aluminum casing, or a composite metal casing (such as a copper-aluminum composite casing).

[0107] The outer shell can be a hollow structure, with an internal cavity for accommodating the electrode assembly and electrolyte.

[0108] In some embodiments, the casing of the battery cell is a cylindrical casing, a square casing, a prismatic casing, or a casing of other shapes.

[0109] In some embodiments, the housing includes a housing and an end cap, the housing having an opening and the end cap being connected to the housing and covering the opening;

[0110] The housing is a component used to fit the end cap to form the internal cavity of the battery cell. The formed internal cavity can be used to house the electrode assembly, electrolyte, and other components.

[0111] The housing and end cap can be separate components. For example, an opening can be provided on the housing, and the end cap can be used to close the opening to form an internal cavity for the battery cell.

[0112] The housing can come in various shapes and sizes, such as cuboid or cylindrical. Specifically, the shape of the housing can be determined based on the specific shape and size of the electrode assembly. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, and aluminum alloy.

[0113] The shape of the end cap can be adapted to the shape of the housing to fit the housing. The material of the end cap can be the same as or different from that of the housing. Optionally, the end cap can be made of a material with a certain degree of hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.), so that the end cap is not easily deformed when subjected to compression and impact, enabling the battery cell to have higher structural strength and improve reliability.

[0114] The end caps are attached to the housing by welding, bonding, snap-fitting, or other means.

[0115] The housing may be open at one end or at both ends. In some examples, the housing may be a structure with an opening on one side, with one end cap fitting over the housing. In other examples, the housing may be a structure with openings on both sides, with two end caps fitting over the two openings of the housing, respectively.

[0116] Electrode assemblies are the components within a single battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies.

[0117] In some embodiments, the electrode assembly includes a positive electrode and a negative electrode, wherein the positive electrode and the negative electrode have opposite polarities.

[0118] In some embodiments, the positive electrode may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector.

[0119] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive electrode film layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0120] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0121] As an example, the positive electrode film layer includes a positive electrode active material, which may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0122] In some embodiments, the negative electrode may include a negative current collector.

[0123] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0124] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector.

[0125] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0126] As an example, the negative electrode film layer includes a negative electrode active material, which may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0127] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0128] In some embodiments, the electrode assembly further includes a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrode plates, serving both to transport ions and to isolate the positive and negative electrodes.

[0129] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0130] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0131] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0132] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0133] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0134] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0135] In some implementations, the electrode assembly is a stacked structure.

[0136] As an example, multiple positive and negative electrode plates can be set, with multiple positive and multiple negative electrode plates stacked alternately. As an example, multiple positive electrode plates can be set, and negative electrode plates are folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0137] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0138] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0139] In some embodiments, the positive current collector may include a positive tab, and the negative current collector may include a negative tab. The positive and negative tabs can be used to transmit current. As an example, at least a portion of the positive tab is not coated with a positive film layer, and at least a portion of the negative tab is not coated with a negative film layer.

[0140] In some embodiments, the electrode assembly is a wound structure. The positive electrode tab is wound multiple turns along the winding direction. Optionally, the end of the positive electrode tab is bent by a flattening or smoothing process to form a multi-layered structure stacked in the axial direction of the electrode assembly. Optionally, the positive electrode tab is annular.

[0141] In some embodiments, the negative electrode tab is wound multiple turns along the winding direction. Optionally, the end of the negative electrode tab is bent by a flattening or smoothing process to form a multi-layered structure stacked in the axial direction of the electrode assembly. The negative electrode tab is annular.

[0142] In some embodiments, the electrode assembly includes an electrode body. As an example, the electrode body includes a positive electrode film, a portion of a positive current collector covered by the positive electrode film, a negative electrode film, and a portion of a negative current collector covered by the negative electrode film.

[0143] The positive and negative tabs can be drawn from the same end of the electrode body, or they can be drawn from opposite ends of the electrode body.

[0144] In some embodiments, a battery cell includes a positive electrode lead and a negative electrode lead, wherein the positive electrode lead is electrically connected to a positive electrode plate and the negative electrode lead is electrically connected to a negative electrode plate.

[0145] The positive and negative leads are used to connect to the external circuit to enable charging or discharging of the battery cells.

[0146] In some embodiments, the positive lead-out portion includes a positive terminal. At least a portion of the positive terminal is exposed to the outside of the battery cell to facilitate connection with a busbar.

[0147] As an example, the positive terminal may be a separately molded component that is mounted on the housing. Alternatively, the positive terminal may also be part of the housing.

[0148] In some examples, the positive terminal is directly connected to the positive plate; in other examples, the positive terminal and the positive plate are indirectly connected through other conductive structures, such as a positive adapter plate.

[0149] In some embodiments, the positive terminal is attached to the end cap by welding, riveting, snap-fitting, or other means.

[0150] In some embodiments, the negative lead-out portion includes a negative terminal. At least a portion of the negative terminal is exposed to the outside of the battery cell to facilitate connection with a busbar.

[0151] As an example, the negative terminal can be a separately molded component that is mounted on the housing. Alternatively, the negative terminal can also be part of the housing.

[0152] In some examples, the negative terminal is directly connected to the negative electrode plate; in other examples, the negative lead-out section also includes other conductive structures connecting the negative terminal and the negative electrode plate, such as a negative electrode adapter plate.

[0153] In some embodiments, the negative terminal is attached to the end cap by welding, riveting, snap-fitting, or other means.

[0154] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in some embodiments of this application. Figure 5 This is a cross-sectional schematic diagram of an electrode assembly for a battery cell provided in some embodiments of this application. Figure 6This is a schematic diagram of the structure of the first and second electrodes of a battery cell provided in some embodiments of this application. Figure 7 This is a partial structural diagram of the first and second electrodes of a battery cell provided in some embodiments of this application.

[0155] Continue to refer to Figures 4 to 7 This application provides a battery cell 7, which includes a housing 10 and an electrode assembly 20. The electrode assembly 20 is housed within the housing 10 and includes an electrode sheet, a solid electrolyte 23, and a first insulating component 24. The electrode sheet includes a first electrode sheet 21 and a second electrode sheet 22. The first electrode sheet 21 and the second electrode sheet 22 are staggered along the thickness direction X of the electrode sheet and have opposite polarities. The solid electrolyte 23 is disposed between the first electrode sheet 21 and the second electrode sheet 22.

[0156] The first electrode 21 includes a first electrode body 211 and a first electrode tab 212. The first electrode tab 212 is connected to one side of the first electrode body 211 along the first direction Y. The second electrode 22 includes a second electrode body 221 and a second electrode tab 222. The second electrode tab 222 is connected to one side of the second electrode body 221 along the first direction Y. The first direction Y is perpendicular to the thickness direction X of the electrode.

[0157] The first insulating component 24 includes a first insulator 241 and a second insulator 242. The first insulator 241 is disposed at one end of the second electrode body 221 along the first direction Y near the first electrode tab 212 and is used to insulate the first electrode tab 212 and the second electrode body 221. The second insulator 242 is disposed at one end of the first electrode body 211 along the first direction Y near the second electrode tab 222 and is used to insulate the second electrode tab 222 and the first electrode body 211.

[0158] One of the first electrode 21 and the second electrode 22 is the positive electrode, and the other is the negative electrode. The relevant structures of the positive and negative electrodes are described above and will not be repeated here.

[0159] The electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0160] As an example, the electrode assembly 20 has a wound structure, with the first electrode 21 and the second electrode 22 wound into a wound structure. In the wound structure, the first electrode 21 and the second electrode 22 are arranged adjacent to each other along the thickness direction X of the electrode, which means that multiple turns of the first electrode 21 and multiple turns of the second electrode 22 are alternately stacked in sequence.

[0161] As an example, the electrode assembly 20 has a stacked structure, and multiple first electrodes 21 and multiple second electrodes 22 can be provided respectively, with multiple first electrodes 21 and multiple second electrodes 22 being stacked alternately. In the stacked structure, the first electrodes 21 and the second electrodes 22 being arranged adjacent to each other along the thickness direction X of the electrodes means that multiple first electrodes 21 and multiple second electrodes 22 are stacked alternately in sequence.

[0162] Solid electrolyte 23 has multiple configuration options.

[0163] As an example, a solid electrolyte 23 can be coated on both sides of the first electrode 21 opposite to each other along the thickness direction X, and then the first electrode 21 and the second electrode 22 can be assembled so that the solid electrolyte 23 is connected between the first electrode 21 and the second electrode 22.

[0164] As an example, solid electrolyte 23 can be coated on both sides of the second electrode 22 opposite to each other along the thickness direction X, and then the first electrode 21 and the second electrode 22 can be assembled so that the solid electrolyte 23 is connected between the first electrode 21 and the second electrode 22.

[0165] As an example, it is also possible to coat the solid electrolyte 23 on both sides of the first electrode 21 opposite to each other along the thickness direction X, and to coat the solid electrolyte 23 on both sides of the second electrode 22 opposite to each other along the thickness direction X, and then assemble the first electrode 21 and the second electrode 22 so that the solid electrolyte 23 is connected between the first electrode 21 and the second electrode 22.

[0166] The first electrode 21 may include a first current collector 2111 and a first film layer disposed on at least one surface of the first current collector 2111. The portion of the first current collector 2111 without the first film layer constitutes a first electrode tab 212, and the portion of the first current collector 2111 covered with the first film layer and the first film layer constitute the first electrode body 211.

[0167] The second electrode 22 may include a second current collector 2211 and a second film layer disposed on at least one surface of the second current collector 2211. The portion of the second current collector 2211 without the second film layer constitutes a second electrode tab 222, and the portion of the second current collector 2211 covered with the second film layer and the second film layer constitute the second electrode body 221.

[0168] Understandably, the first tab 212 is prone to deformation or movement along the direction close to the second electrode body 221 under mechanical stress, which could lead to a short circuit due to the first tab 212 overlapping with the second electrode body 221. Similarly, the second tab 222 is prone to deformation or movement along the direction close to the first electrode body 211 under mechanical stress, which could also lead to a short circuit due to the second tab 222 overlapping with the first electrode body 211.

[0169] The first insulator 241 is disposed at one end of the second electrode body 221 along the first direction Y near the first electrode tab 212. There are various specific arrangements of the first insulator 241.

[0170] As an example, the first insulator 241 may be connected to the second electrode body 221 and located on the side of the first electrode tab 212 close to the second electrode body 221, and the first insulator 241 and the first electrode tab 212 are spaced apart, that is, there is a gap between the first insulator 241 and the first electrode tab 212.

[0171] As an example, the first insulator 241 can also be connected to both the first tab 212 and the second electrode body 221. That is, the first insulator 241 is connected between the first tab 212 and the second electrode body 221.

[0172] The second insulator 242 is disposed at one end of the first electrode body 211 along the first direction Y near the second electrode tab 222. There are various specific arrangements of the second insulator 242.

[0173] As an example, the second insulator 242 may be connected to the first electrode body 211 and located on the side of the second electrode tab 222 close to the first electrode body 211, and the second insulator 242 and the second electrode tab 222 are spaced apart, that is, there is a gap between the second insulator 242 and the second electrode tab 222.

[0174] As an example, the second insulator 242 can also be connected to both the second tab 222 and the first electrode body 211. That is, the second insulator 242 is connected between the second tab 222 and the first electrode body 211.

[0175] The material of the first insulating component 24 includes, but is not limited to, various organic insulating materials such as epoxy acrylate, polyurethane acrylate, resin adhesive, and rubber, as well as various inorganic insulating materials such as mica and asbestos, and insulating materials formed by mixing the above-mentioned organic insulating materials and the above-mentioned inorganic insulating materials.

[0176] Even if the first tab 212 deforms or moves in the direction close to the second electrode body 221 under mechanical stress, the first insulator 241 can provide insulation support for the first tab 212, reducing the risk of the first tab 212 overlapping with the second electrode body 221.

[0177] Even if the second tab 222 deforms or moves in the direction close to the first electrode body 211 under mechanical stress, the second insulator 242 can provide insulation support for the second tab 222, reducing the risk of overlap between the first tab 212 and the second electrode body 221.

[0178] Thus, the introduction of the first insulating component 24 can reduce the risk of short circuit due to overlap between the first electrode 21 and the second electrode 22. During the densification process of the electrode assembly 20, such as compaction or hot pressing, the scrap rate of the electrode assembly 20 can be reduced, which helps to improve the product yield of the battery cell 7. During the use of the battery cell 7, the reliability of the battery cell 7 can be improved.

[0179] The above technical solution introduces a first insulating component 24. The first insulator 241 can isolate and protect the first tab 212 and the second electrode body 221, thereby reducing the risk of short circuit caused by the first tab 212 and the second electrode body 221 overlapping. The second insulator 242 can isolate and protect the second tab 222 and the first electrode body 211, thereby reducing the risk of short circuit caused by the second tab 222 and the first electrode body 211 overlapping. This can effectively improve the reliability and product yield of the battery cell 7.

[0180] In some embodiments, the projection of the first insulator 241 along the first direction Y covers the projection of the second electrode body 221 along the first direction Y. This allows the first insulator 241 to completely cover the end of the second electrode body 221 along the first direction Y near the first tab 212, thereby further improving the isolation and protection effect of the first insulator 241 on the first tab 212 and the second electrode body 221.

[0181] In some embodiments, the projection of the second insulator 242 along the first direction Y covers the projection of the first electrode body 211 along the first direction Y. This allows the second insulator 242 to completely cover the end of the first electrode body 211 along the first direction Y near the second tab 222, thereby further improving the isolation and protection effect of the second insulator 242 on the second tab 222 and the first electrode body 211.

[0182] In some embodiments, a first insulator 241 is connected to a first tab 212, and a second insulator 242 is connected to a second tab 222. In other words, the first insulator 241 is formed on the surface of the first tab 212 along the thickness direction X, and the second insulator 242 is formed on the surface of the second tab 222 along the thickness direction X.

[0183] For example, an insulating material may be coated or sprayed onto the surface of the first electrode 212 along the thickness direction X to form a first insulator 241, and an insulating material may be coated or sprayed onto the surface of the second electrode 222 along the thickness direction X to form a second insulator 242. Then, the first electrode 21 and the second electrode 22 are assembled such that the first insulator 241 is disposed at one end of the second electrode body 221 along the first direction Y near the first electrode 212, and the second insulator 242 is disposed at one end of the first electrode body 211 along the first direction Y near the second electrode 222.

[0184] After the first electrode 21 and the second electrode 22 are assembled, a splicing structure can be formed between the first insulator 241, the second insulator 242, the first electrode body 211, and the second electrode body 221, resulting in a high degree of compactness of the electrode assembly 20.

[0185] Furthermore, it is readily understood that, prior to the densification process such as compaction or hot pressing on the electrode assembly 20, the aforementioned technical solution already forms a first insulator 241 on the surface of the first tab 212 along the thickness direction X, and a second insulator 242 on the surface of the second tab 222 along the thickness direction X. Thus, during the densification process of the electrode assembly 20, the first insulator 241 can isolate and protect the first tab 212 and the second electrode body 221, reducing the risk of a short circuit due to the overlap of the first tab 212 and the second electrode body 221. Similarly, the second insulator 242 can isolate and protect the second tab 222 and the first electrode body 211, reducing the risk of a short circuit due to the overlap of the second tab 222 and the first electrode body 211.

[0186] As an example, the first insulator 241 may be connected to one side surface of the first tab 212 along the thickness direction X and protrude from one side surface of the first electrode body 211 along the thickness direction X.

[0187] As an example, the first insulator 241 may also be connected to the two opposite surfaces of the first tab 212 along the thickness direction X, and protrude from the two opposite surfaces of the first electrode body 211 along the thickness direction X.

[0188] As an example, the second insulator 242 may be connected to one side surface of the second tab 222 along the thickness direction X and protrude from one side surface of the second electrode body 221 along the thickness direction X.

[0189] As an example, the second insulator 242 may also be connected to the two opposite surfaces of the second tab 222 along the thickness direction X, and protrude from the two opposite surfaces of the second electrode body 221 along the thickness direction X.

[0190] It is understandable that the electrode is relatively thin. Compared with the end of the first electrode 21 along the first direction Y, the surface of the first electrode tab 212 along the thickness direction X has a relatively large installation space. The first insulator 241 is connected to the first electrode tab 212, which helps to reduce the installation difficulty of the first insulator 241.

[0191] Compared to the end of the second electrode 22 along the first direction Y, the surface of the second electrode tab 222 along the thickness direction X has a relatively large installation space. The second insulator 242 is connected to the second electrode tab 222, which helps to reduce the installation difficulty of the second insulator 242.

[0192] Thus, the above technical solution can not only reduce the difficulty of setting the first insulator 241 and the second insulator 242, but also improve the structural compactness of the electrode assembly 20, which helps to improve the energy density of the battery cell 7.

[0193] In some embodiments, at least a portion of the end of the second electrode body 221 facing away from the second electrode tab 222 abuts against the first insulator 241.

[0194] For example, the end of the second electrode body 221 facing away from the second electrode tab 222 may be partially abutted against the first insulator 241, or it may be entirely abutted against the first insulator 241.

[0195] The above technical solution enables the first insulator 241 to limit the displacement of the second electrode 22 along the first direction Y to a certain extent, thereby improving the overall structural stability of the electrode assembly 20.

[0196] In some embodiments, at least a portion of the end of the first electrode body 211 facing away from the first electrode tab 212 abuts against the second insulator 242.

[0197] For example, the end of the first electrode body 211 facing away from the first electrode tab 212 may be partially abutted against the first insulator 241, or it may be completely abutted against the first insulator 241.

[0198] The above technical solution enables the second insulator 242 to limit the displacement of the first electrode 21 along the first direction Y to a certain extent, thereby improving the overall structural stability of the electrode assembly 20.

[0199] In some embodiments, the first electrode body 211 includes a first current collector 2111, a first active material layer 2112, and a second active material layer 2113. The first active material layer 2112 and the second active material layer 2113 are respectively coated on the two opposite surfaces of the first current collector 2111 along the thickness direction X. The first insulator 241 is connected to the side of the first electrode tab 212 near the first active material layer 2112 and protrudes from the side surface of the first active material layer 2112 opposite to the first current collector 2111.

[0200] The second electrode body 221 includes a second current collector 2211, a third active material layer 2212 and a fourth active material layer 2213. The third active material layer 2212 and the fourth active material layer 2213 are respectively connected to the two opposite surfaces of the second current collector 2211 along the thickness direction X. The second insulator 242 is connected to the side of the second electrode tab 222 near the third active material layer 2212 and protrudes from the side surface of the third active material layer 2212 opposite to the second current collector 2211.

[0201] The first active material layer 2112 and the third active material layer 2212 are arranged opposite to each other, and the second active material layer 2113 and the fourth active material layer 2213 are arranged opposite to each other.

[0202] For example, the first insulator 241 is located on the side of the first active material layer 2112 along the first direction Y, close to the first tab 212. After the first electrode 21 and the second electrode 22 are assembled to form the electrode assembly 20, the second electrode body 221 is located on the side of the first insulator 241 along the first direction Y, close to the first electrode body 211. The second insulator 242 is located on the side of the third active material layer 2212 along the first direction Y, close to the second tab 222. After the first electrode 21 and the second electrode 22 are assembled to form the electrode assembly 20, the first electrode body 211 is located on the side of the second insulator 242 along the first direction Y, close to the second electrode body 221.

[0203] The first active material layer 2112 and the third active material layer 2212 are arranged opposite to each other. This can be understood as follows: after the first electrode 21 and the second electrode 22 are assembled to form the electrode assembly 20, the first active material layer 2112 and the third active material layer 2212 are opposite to each other along the thickness direction X.

[0204] The second active material layer 2113 and the fourth active material layer 2213 are arranged opposite to each other. This can be understood as follows: after the first electrode 21 and the second electrode 22 are assembled to form the electrode assembly 20, the second active material layer 2113 and the fourth active material layer 2213 are opposite to each other along the thickness direction X.

[0205] The second electrode body 221 is located on the side of the first insulator 241 along the first direction Y, close to the first electrode body 211, and there are several specific arrangements.

[0206] As an example, the third active material layer 2212 may be located on the side of the first insulator 241 along the first direction Y, close to the first electrode body 211. In other words, the projection of the first insulator 241 along the first direction Y overlaps with the projection of the third active material layer 2212 along the first direction Y.

[0207] Furthermore, the end of the third active material layer 2212 facing away from the second electrode 222 abuts against the first insulator 241.

[0208] As an example, the third active material layer 2212 and the second current collector 2211 can both be located on the side of the first insulator 241 along the first direction Y, close to the first electrode body 211. In other words, the projection of the first insulator 241 along the first direction Y overlaps with the projection of the third active material layer 2212 along the first direction Y, and the projection of the first insulator 241 along the first direction Y overlaps with the projection of the second current collector 2211 along the first direction Y.

[0209] Furthermore, the end of the third active material layer 2212 facing away from the second electrode 222 and the end of the second current collector 2211 facing away from the second electrode 222 are both in contact with the first insulator 241.

[0210] As an example, the third active material layer 2212, the second current collector 2211, and the fourth active material layer 2213 can all be located on the side of the first insulator 241 along the first direction Y, close to the first electrode body 211. In other words, the projection of the first insulator 241 along the first direction Y overlaps with the projection of the third active material layer 2212 along the first direction Y, the projection of the first insulator 241 along the first direction Y overlaps with the projection of the second current collector 2211 along the first direction Y, and the projection of the first insulator 241 along the first direction Y overlaps with the projection of the fourth active material layer 2213 along the first direction Y.

[0211] Furthermore, the end of the third active material layer 2212 facing away from the second electrode 222, the end of the second current collector 2211 facing away from the second electrode 222, and the end of the fourth active material layer 2213 facing away from the second electrode 222 all abut against the first insulator 241.

[0212] The first electrode body 211 is located on the side of the second insulator 242 along the first direction Y, close to the second electrode body 221, and there are several specific arrangements.

[0213] As an example, the first active material layer 2112 may be located on the side of the second insulator 242 along the first direction Y, close to the second electrode body 221. In other words, the projection of the second insulator 242 along the first direction Y overlaps with the projection of the first active material layer 2112 along the first direction Y.

[0214] Furthermore, the end of the first active material layer 2112 facing away from the first tab 212 abuts against the second insulator 242.

[0215] As an example, the first active material layer 2112 and the first current collector 2111 can both be located on the side of the second insulator 242 along the first direction Y, close to the second electrode body 221. In other words, the projection of the second insulator 242 along the first direction Y overlaps with the projection of the first active material layer 2112 along the first direction Y, and the projection of the second insulator 242 along the first direction Y overlaps with the projection of the first current collector 2111 along the first direction Y.

[0216] Furthermore, the end of the first active material layer 2112 facing away from the first tab 212 and the end of the first current collector 2111 facing away from the first tab 212 are both in contact with the second insulator 242.

[0217] As an example, the first active material layer 2112, the first current collector 2111, and the second active material layer 2113 can all be located on the side of the second insulator 242 along the first direction Y, close to the second electrode body 221. In other words, the projection of the second insulator 242 along the first direction Y overlaps with the projection of the first active material layer 2112 along the first direction Y, the projection of the second insulator 242 along the first direction Y overlaps with the projection of the first current collector 2111 along the first direction Y, and the projection of the second insulator 242 along the first direction Y overlaps with the projection of the second active material layer 2113 along the first direction Y.

[0218] Furthermore, the end of the first active material layer 2112 facing away from the first tab 212, the end of the first current collector 2111 facing away from the first tab 212, and the end of the second active material layer 2113 facing away from the first tab 212 are all in contact with the second insulator 242.

[0219] The above technical solution provides a first insulator 241 on only one side of the first electrode tab 212 along the thickness direction X, and a second insulator 242 on only one side of the second electrode tab 222 along the thickness direction X, so that the first electrode 21 and the second electrode 22 form a splicing assembly structure, which helps to simplify the manufacturing process of the electrode assembly 20 and reduce costs.

[0220] In some embodiments, the projection of the second active material layer 2113 along the thickness direction X overlaps with the projection of the first insulator 241 along the thickness direction X. This allows the second active material layer 2113 to fill the gap between the first insulator 241 and the first tab 212 to a certain extent, improving the overall structural compactness and stability of the electrode assembly 20.

[0221] In some embodiments, the projection of the fourth active material layer 2213 along the thickness direction X overlaps with the projection of the second insulator 242 along the thickness direction X. This allows the fourth active material layer 2213 to fill the gap between the second insulator 242 and the second tab 222 to a certain extent, improving the overall structural compactness and stability of the electrode assembly 20.

[0222] In some embodiments, the projection of the second active material layer 2113 along the thickness direction X does not overlap with the projection of the first insulator 241 along the thickness direction X. This allows the first active material layer 2112 and the second active material layer 2113 to be configured with the same coating width, which helps to reduce the fabrication difficulty of the first electrode 21.

[0223] In some embodiments, the projection of the fourth active material layer 2213 along the thickness direction X does not overlap with the projection of the second insulator 242 along the thickness direction X. This allows the third active material layer 2212 and the fourth active material layer 2213 to be configured with the same coating width, which helps to reduce the fabrication difficulty of the second electrode 22.

[0224] In some embodiments, the first dimension L1 of the first active material layer 2112 along the first direction Y, the second dimension L2 of the second active material layer 2113 along the first direction Y, and the third dimension L3 of the first insulator 241 along the first direction Y satisfy the relationship: L2≤L1+L3.

[0225] For example, the first dimension L1 of the first active material layer 2112 along the first direction Y can be understood as the coating width of the first active material layer 2112, the second dimension L2 of the second active material layer 2113 along the first direction Y can be understood as the coating width of the second active material layer 2113, and the third dimension L3 of the first insulator 241 along the first direction Y can be understood as the coating width of the first insulator 241. Here, width refers to the length of the electrode relative to its length; for example, in a wound structure, the dimension of the electrode along the winding direction V is its length.

[0226] Understandably, the first tab 212 is the portion of the first current collector 2111 that does not have an active material layer. The larger the size of the active material layer along the first direction Y, the smaller the effective size of the first tab 212. The effective size of the first tab 212 will affect the subsequent processing and assembly difficulty of the electrode assembly 20, such as the flattening process of the first tab 212 and the connection between the first tab 212 and the electrode terminal. The smaller the effective size of the first tab 212, the greater the subsequent processing and assembly difficulty of the electrode assembly 20.

[0227] Thus, the above technical solution can, to a certain extent, avoid the second active material layer 2113 being too large along the first direction Y, which would result in the effective size of the first electrode tab 212 being too small, thereby reducing the processing and assembly difficulty of the electrode assembly 20.

[0228] In some embodiments, the first dimension L1 satisfies the relationship: 20mm≤L1≤2000mm, and the third dimension L3 satisfies the relationship: 15μm≤L3≤2000μm.

[0229] As an example, the first dimension L1 can be, but is not limited to, 20mm, 100mm, 200mm, 500mm, 1000mm, 1500mm, 2000mm, etc. The third dimension L3 can be, but is not limited to, 15μm, 50μm, 100μm, 500μm, 1000μm, 1500μm, 2000μm, etc.

[0230] It is understandable that the larger the first size L1 is, the greater the energy density of the battery cell 7, and the smaller the settable range of the first insulator 241; the larger the third size L3 is, the better the insulation spacing effect of the first insulator 241, and the smaller the settable range of the first active material layer 2112.

[0231] The above technical solution, by setting the first dimension L1 and the third dimension L3 within the above range, can reduce the impact of the first insulator 241 on the energy density of the battery cell 7 while ensuring that the first insulator 241 has a reliable insulation spacing effect.

[0232] In some embodiments, the first dimension L1 satisfies the relationship: 40mm≤L1≤1000mm, and the third dimension L3 satisfies the relationship: 30μm≤L3≤1000μm. This can further improve the balance between the reliability and energy density of the battery cell 7.

[0233] As an example, the first dimension L1 can be, but is not limited to, 40mm, 300mm, 500mm, 700mm, 800mm, 900mm, 1000mm, etc. The third dimension L3 can be, but is not limited to, 30μm, 40μm, 200μm, 600μm, 800μm, 1000μm, etc.

[0234] In some embodiments, the fourth dimension L4 of the third active material layer 2212 along the first direction Y, the fifth dimension L5 of the fourth active material layer 2213 along the first direction Y, and the sixth dimension L6 of the second insulator 242 along the first direction Y satisfy the relationship: L5≤L4+L6.

[0235] For example, the fourth dimension L4 of the third active material layer 2212 along the first direction Y can be understood as the coating width of the third active material layer 2212, the fifth dimension L5 of the fourth active material layer 2213 along the first direction Y can be understood as the coating width of the fourth active material layer 2213, and the sixth dimension L6 of the second insulator 242 along the first direction Y can be understood as the coating width of the second insulator 242.

[0236] Understandably, the second tab 222 is the portion of the second current collector 2211 without the active material layer. The larger the size of the active material layer along the first direction Y, the smaller the effective size of the second tab 222. The effective size of the second tab 222 affects the subsequent processing and assembly difficulty of the electrode assembly 20, such as the flattening process of the second tab 222 and the connection between the second tab 222 and the electrode terminal. The smaller the effective size of the second tab 222, the greater the subsequent processing and assembly difficulty of the electrode assembly 20.

[0237] Thus, the above technical solution can, to a certain extent, avoid the fourth active material layer 2213 being too large along the first direction Y, which would result in the second tab 222 being too small in effective size, thereby reducing the processing and assembly difficulty of the electrode assembly 20.

[0238] In some embodiments, the fourth dimension L4 satisfies the relationship: 20mm≤L4≤2000mm, and the sixth dimension L6 satisfies the relationship: 15μm≤L6≤2000μm.

[0239] As an example, the fourth dimension L4 can be, but is not limited to, 20mm, 100mm, 200mm, 500mm, 1000mm, 1500mm, 2000mm, etc. The sixth dimension L6 can be, but is not limited to, 15μm, 50μm, 100μm, 500μm, 1000μm, 1500μm, 2000μm, etc.

[0240] It is understandable that the larger the fourth dimension L4 is, the greater the energy density of the battery cell 7, and the smaller the settable range of the second insulator 242; the larger the sixth dimension L6 is, the better the insulation spacing effect of the second insulator 242, and the smaller the settable range of the third active material layer 2212.

[0241] The above technical solution, by setting the fourth dimension L4 and the sixth dimension L6 within the above range, can reduce the impact of the second insulator 242 on the energy density of the battery cell 7 while ensuring that the second insulator 242 has a reliable insulation spacing effect.

[0242] In some embodiments, the fourth dimension L4 satisfies the relationship: 40mm≤L4≤1000mm, and the sixth dimension L6 satisfies the relationship: 30μm≤L6≤1000μm. This can further improve the balance between the reliability and energy density of the battery cell 7.

[0243] As an example, the fourth dimension L4 can be, but is not limited to, 40mm, 300mm, 500mm, 700mm, 800mm, 900mm, 1000mm, etc. The sixth dimension L6 can be, but is not limited to, 30μm, 40μm, 200μm, 600μm, 800μm, 1000μm, etc.

[0244] In some embodiments, the first dimension L1 of the first active material layer 2112 along the first direction Y and the fourth dimension L4 of the third active material layer 2212 along the first direction Y satisfy the relationship: -2mm≤L1-L4≤2mm.

[0245] As an example, L1-L4 can be, but is not limited to, -2mm, -1mm, -0.5mm, 0, 0.5mm, 1mm, 2mm, etc.

[0246] It is understandable that the greater the difference between the first dimension L1 of the first active material layer 2112 along the first direction Y and the fourth dimension L4 of the third active material layer 2212 along the first direction Y, the larger the gap inside the electrode assembly 20 will be after the first electrode 21 and the second electrode 22 are assembled to form the electrode assembly 20. During the densification process of the electrode assembly 20, such as compaction or hot pressing, or when the battery cell 7 is subjected to vibration or impact during use, the risk of deformation or collapse of the electrode assembly 20 will be greater.

[0247] Thus, by setting the difference between the first dimension L1 and the fourth dimension L4 within the aforementioned range, the above-mentioned technical solution can reduce the gaps inside the electrode assembly 20 and improve the reliability of the electrode assembly 20.

[0248] In some embodiments, the first dimension L1 and the fourth dimension L4 satisfy the relationship: -0.5mm ≤ L1 - L4 ≤ 0.5mm. This can further reduce the gaps inside the electrode assembly 20, thereby further improving the reliability of the electrode assembly 20.

[0249] As an example, L1-L4 can be, but is not limited to, -0.5mm, -0.4mm, -0.3mm, -0.2mm, -0.1mm, 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0250] In some embodiments, the surface of the first insulator 241 away from the first current collector 2111 along the thickness direction X is flush with the surface of the fourth active material layer 2213 away from the second current collector 2211 along the thickness direction X. This effectively improves the structural consistency and compactness of the electrode assembly 20, contributing to further improvements in the reliability of the electrode assembly 20.

[0251] In some embodiments, the surface of the second insulator 242 away from the second current collector 2211 along the thickness direction X is flush with the surface of the first active material layer 2112 away from the first current collector 2111 along the thickness direction X. This effectively improves the structural consistency and compactness of the electrode assembly 20, contributing to further improvements in the reliability of the electrode assembly 20.

[0252] In some embodiments, the solid electrolyte 23 includes a first electrolyte layer 231 and a second electrolyte layer 232, which are respectively coated on the two opposite surfaces of the second electrode body 221 along the thickness direction X.

[0253] For example, during the preparation of the second electrode 22, a third active material layer 2212 and a fourth active material layer 2213 are first coated on the two opposite surfaces of the second current collector 2211 along the thickness direction X. Then, a solid electrolyte 23 is coated on the side surface of the third active material layer 2212 facing away from the second current collector 2211 to form a first electrolyte layer 231. A solid electrolyte 23 is coated on the side surface of the fourth active material layer 2213 facing away from the second current collector 2211 to form a second electrolyte layer 232.

[0254] By directly coating the solid electrolyte 23 onto the second electrode body 221, the fabrication process of the electrode assembly 20 can be simplified, which helps to reduce costs.

[0255] In some embodiments, the first electrode 21 and the second electrode 22 are wound along the winding direction V, and the first electrode tab 212 and the second electrode tab 222 are arranged opposite to each other along the first direction Y.

[0256] The first tab 212 is wound along the winding direction V and includes multiple turns of the first tab layer; the second tab 222 is wound along the winding direction V and includes multiple turns of the second tab layer; the first insulator 241 is disposed between two adjacent turns of the first tab layer; and the second insulator 242 is disposed between two adjacent turns of the second tab layer.

[0257] For example, the electrode assembly 20 formed by winding the first electrode 21 and the second electrode 22 along the winding direction V can be cylindrical. The first electrode body 211 and the second electrode body 221 are wound to form the electrode body. The first electrode tab 212 and the second electrode tab 222 are arranged opposite to each other along the first direction Y, which means that the first electrode tab 212 and the second electrode tab 222 are respectively led out from the two ends opposite to each other along the first direction Y of the electrode body.

[0258] The first tab 212 has an inner end and an outer end at its two ends along the winding direction V. In this embodiment, the first tab layer is divided based on the inner end of the first tab 212. The winding direction V is perpendicular to the winding axis.

[0259] Specifically, the inner end of the first tab 212 is the beginning end of the first loop of the first tab layer, and the tail end of the first loop of the first tab layer is aligned radially with the beginning end of the first loop of the first tab layer. The first loop of the first tab layer wraps around the winding axis once. Correspondingly, the tail end of the first loop of the first tab layer is the beginning end of the second loop of the first tab layer, and so on, with multiple loops of the first tab layer connected end-to-end along the winding direction V. When dividing the first tab layer, the beginning end of each loop of the first tab layer is aligned radially with the inner end of the first tab 212. The radial direction of the first tab 212 is perpendicular to and passes through the winding axis.

[0260] For example, the inner and outer ends of the first tab 212 are aligned radially, such that each tab layer wraps around the winding axis once.

[0261] Of course, alternatively, the tail of the first tab 212 may have a portion that wraps around the winding axis less than one turn, for example, the portion may wrap around the winding axis 1 / 3 turn, 1 / 2 turn, 2 / 3 turn or 3 / 4 turn.

[0262] After winding, the first tab 212 is generally cylindrical, with a gap between adjacent turns of the first tab layer. The first insulator 241 is disposed between adjacent turns of the first tab layer, which can be understood as the first insulator 241 being disposed in the gap between adjacent turns of the first tab layer.

[0263] As an example, the first insulator 241 is connected between two adjacent turns of the first tab layer in a direction perpendicular to the winding axis.

[0264] The second tab 222 has an inner end and an outer end at its two ends along the winding direction V. In this embodiment, the second tab layer is divided based on the inner end of the second tab 222. The winding direction V is perpendicular to the winding axis.

[0265] Specifically, the inner end of the second tab 222 is the beginning end of the first loop of the second tab layer. The tail end of the first loop of the second tab layer is aligned radially with the beginning end of the first loop of the second tab layer. The first loop of the second tab layer wraps around the winding axis once. Correspondingly, the tail end of the first loop of the second tab layer is the beginning end of the second loop of the second tab layer, and so on, with multiple loops of the second tab layer connected end-to-end along the winding direction V. When dividing the second tab layers, the beginning end of each loop of the second tab layer is aligned radially with the inner end of the second tab 222. The radial direction of the second tab 222 is perpendicular to and passes through the winding axis.

[0266] For example, the inner and outer ends of the second tab 222 are aligned radially with the second tab 222, such that each tab layer wraps around the winding axis once.

[0267] Of course, alternatively, the tail of the second tab 222 may have a portion that wraps around the winding axis less than one turn, for example, the portion may wrap around the winding axis 1 / 3 turn, 1 / 2 turn, 2 / 3 turn or 3 / 4 turn.

[0268] After winding, the second tab 222 is generally cylindrical, with a gap between adjacent turns of the second tab layer. The first insulator 241 is disposed between adjacent turns of the second tab layer, which can be understood as the first insulator 241 being disposed in the gap between adjacent turns of the second tab layer.

[0269] As an example, the first insulator 241 is connected between two adjacent turns of the second tab layer in a direction perpendicular to the winding axis.

[0270] It is understandable that, compared to the stacked electrode assembly 20, the wound electrode assembly 20 has a larger tab area. Therefore, during the densification process of the electrode assembly 20, such as compaction or hot pressing, or when the battery cell 7 is subjected to vibration or impact during use, the tab of the wound electrode assembly 20 is more likely to deform or collapse, resulting in a greater risk of short circuit.

[0271] Thus, the above technical solution can greatly reduce the risk of short circuit in the wound electrode assembly 20, improve the shortcomings of the solid-state battery cell 7 with the wound electrode assembly 20, and effectively improve the economic benefits of the solid-state battery cell 7 with the wound electrode assembly 20.

[0272] Figure 8 This is a cross-sectional schematic diagram of an electrode assembly for a battery cell provided for some embodiments of this application.

[0273] Continue to refer to Figure 8In some embodiments, the battery cell 7 further includes a support member 30, with the first electrode 21 and the second electrode 22 wound around the support member 30.

[0274] The support component 30 is used to support the first electrode 21 and the second electrode 22 to reduce the risk of the first electrode 21 and the second electrode 22 deforming or collapsing inward under external force, thereby improving the reliability of the battery cell 7.

[0275] As an example, the support component 30 is made of an insulating material, which includes, but is not limited to, various organic insulating materials such as epoxy acrylate, polyurethane acrylate, resin glue, and rubber, as well as various inorganic insulating materials such as mica and asbestos, and insulating materials formed by a mixture of the above-mentioned organic insulating materials and the above-mentioned inorganic insulating materials.

[0276] As an example, the support component 30 is a cylindrical structure.

[0277] In some embodiments, the surface of the first insulator 241 away from the second electrode body 221 along the first direction Y is flush with the end face of the support member 30 near the first tab 212 along the first direction Y. This can improve the structural consistency of the electrode assembly 20 and reduce the processing or assembly difficulty of the electrode assembly 20.

[0278] In some embodiments, the surface of the second insulator 242 away from the first electrode body 211 along the first direction Y is flush with the end face of the support member 30 near the second electrode tab 222 along the first direction Y. This can improve the structural consistency of the electrode assembly 20 and reduce the processing or assembly difficulty of the electrode assembly 20.

[0279] Figure 9 This is a schematic diagram of the winding structure of the first and second electrodes of a battery cell provided in some embodiments of this application.

[0280] Continue to refer to Figure 9 In some embodiments, both ends of the second electrode 22 extend beyond both ends of the first electrode 21 in the winding direction V. The electrode assembly 20 also includes a second insulating component 40, which is connected to both ends of the first electrode 21 in the winding direction V and is used to insulate both ends of the first electrode 21 in the winding direction V and the second electrode 22.

[0281] In this embodiment, the first electrode 21 is a positive electrode and the second electrode 22 is a negative electrode.

[0282] For example, the first electrode 21 has a beginning end and a end end at its two ends along the winding direction V. The second insulating component 40 is connected to the beginning end of the first electrode 21 along the winding direction V. In a direction perpendicular to the winding axis, even if the second electrode 22 located on both sides of the beginning end of the first electrode 21 along the winding direction V deforms or moves under mechanical stress in a direction close to the beginning end of the first electrode 21 along the winding direction V, the second insulating component 40 can provide insulation support for the second electrode 22, reducing the risk of overlap between the beginning end of the first electrode 21 and the second electrode 22 along the winding direction V.

[0283] The second insulating component 40 is connected to the tail end of the first electrode 21 along the winding direction V. In the direction perpendicular to the winding axis, even if the second electrode 22 located on both sides of the tail end of the first electrode 21 along the winding direction V deforms or moves under mechanical stress in the direction close to the tail end of the first electrode 21 along the winding direction V, the second insulating component 40 can provide insulation support for the second electrode 22, reducing the risk of overlap between the tail end of the first electrode 21 along the winding direction V and the second electrode 22.

[0284] As an example, the second insulating component 40 can be insulating tape or insulating adhesive.

[0285] The above technical solution, by introducing a second insulating component 40, can further reduce the risk of short circuit between the first electrode 21 and the second electrode 22, thereby further improving the reliability of the battery cell 7.

[0286] According to some embodiments of this application, this application also provides a battery device including a battery cell 7 of any of the above schemes.

[0287] According to some embodiments of this application, this application also provides an electrical device, including a battery cell 7 or a battery device of any of the above schemes, wherein the battery cell 7 or the battery device is used to store or provide electrical energy.

[0288] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. All technical features and optional technical features of this application can be combined to form new technical solutions.

[0289] To better understand the battery cell 7 provided in the embodiments of this application, based on the same inventive concept, embodiments of the battery cell 7 in practical applications are provided here for illustration.

[0290] This application provides a battery cell 7, which includes a housing 10 and an electrode assembly 20. The electrode assembly 20 is housed within the housing 10 and includes an electrode sheet, a solid electrolyte 23, and a first insulating component 24. The electrode sheet includes a first electrode sheet 21 and a second electrode sheet 22. The first electrode sheet 21 and the second electrode sheet 22 are staggered along the thickness direction X of the electrode sheet and have opposite polarities. The solid electrolyte 23 is disposed between the first electrode sheet 21 and the second electrode sheet 22.

[0291] The first electrode 21 includes a first electrode body 211 and a first electrode tab 212. The first electrode tab 212 is connected to one side of the first electrode body 211 along a first direction Y. The second electrode 22 includes a second electrode body 221 and a second electrode tab 222. The second electrode tab 222 is connected to one side of the second electrode body 221 along a first direction Y, which is perpendicular to the thickness direction X of the electrode. The first electrode 21 and the second electrode 22 are wound along a winding direction V. The first electrode tab 212 is connected to one side of the first electrode body 211 along the first direction Y, and the second electrode tab 222 is connected to one side of the second electrode body 221 along the first direction Y, and the first electrode tab 212 and the second electrode tab 222 are arranged opposite to each other along the first direction Y. The first electrode tab 212 is wound along the winding direction V and includes multiple turns of the first electrode tab layer, and the second electrode tab 222 is wound along the winding direction V and includes multiple turns of the second electrode tab layer.

[0292] The first insulating component 24 includes a first insulator 241 and a second insulator 242. The first insulator 241 is disposed at one end of the second electrode body 221 along the first direction Y, near the first tab 212 and located between two adjacent layers of first tabs 212, and is used to insulate the first tab 212 and the second electrode body 221. The second insulator 242 is disposed at one end of the first electrode body 211 along the first direction Y, near the second tab 222 and located between two adjacent layers of second tabs 222, and is used to insulate the second tab 222 and the first electrode body 211. The end of the second electrode body 221 facing away from the second tab 222 abuts against the side of the first insulator 241 along the first direction Y, near the first electrode body 211. The end of the first electrode body 211 facing away from the first tab 212 abuts against the side of the second insulator 242 along the first direction Y, near the second electrode body 221.

[0293] The above technical solution introduces a first insulating component 24. The first insulator 241 can isolate and protect the first tab 212 and the second electrode body 221, thereby reducing the risk of short circuit caused by the first tab 212 and the second electrode body 221 overlapping. The second insulator 242 can isolate and protect the second tab 222 and the first electrode body 211, thereby reducing the risk of short circuit caused by the second tab 222 and the first electrode body 211 overlapping. This can effectively improve the reliability and product yield of the battery cell 7.

[0294] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0295] 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 battery cell, characterized by, The application relates to a battery, comprising: a housing; an electrode assembly accommodated in the housing, the electrode assembly comprising a tab, a solid-state electrolyte and a first insulating component, the tab comprising a first tab and a second tab, the first tab and the second tab being staggered and opposite in polarity along the thickness direction of the tab, the solid-state electrolyte being arranged between the first tab and the second tab, the first tab comprising a first tab body and a first lug connected to one side of the first tab body along a first direction, the second tab comprising a second tab body and a second lug connected to one side of the second tab body along the first direction, the first direction being perpendicular to the thickness direction of the tab, the first insulating component comprising a first insulator and a second insulator, the first insulator being arranged at one end of the second tab body close to the first lug along the first direction and used for insulating the first lug and the second tab body, the second insulator being arranged at one end of the first tab body close to the second lug along the first direction and used for insulating the second lug and the first tab body; wherein the first insulator is formed on the surface of the first lug along the thickness direction of the tab, and the second insulator is formed on the surface of the second lug along the thickness direction of the tab; wherein the first tab and the second tab are arranged in a winding direction, and the first lug and the second lug are arranged opposite to each other along the first direction; the first lug is wound along the winding direction and comprises a plurality of layers of the first lug, the second lug is wound along the winding direction and comprises a plurality of layers of the second lug, the first insulator is arranged between two adjacent layers of the first lug, and the second insulator is arranged between two adjacent layers of the second lug.

2. The battery cell of claim 1, wherein, a projection of the first insulator along the first direction covers a projection of the second tab body along the first direction; and / or a projection of the second insulator along the first direction covers a projection of the first tab body along the first direction.

3. The battery cell of claim 1, wherein, the first tab body comprises a first current collector, a first active material layer and a second active material layer, the first active material layer and the second active material layer are respectively coated on two side surfaces of the first current collector opposite to each other along the thickness direction, the first insulator is connected to one side of the first lug close to the first active material layer and protrudes from one side surface of the first active material layer away from the first current collector; the second tab body comprises a second current collector, a third active material layer and a fourth active material layer, the third active material layer and the fourth active material layer are respectively connected to two side surfaces of the second current collector opposite to each other along the thickness direction, and the second insulator is connected to one side of the second lug close to the third active material layer and protrudes from one side surface of the third active material layer away from the second current collector; wherein the first active material layer and the third active material layer are oppositely arranged, and the second active material layer and the fourth active material layer are oppositely arranged.

4. The battery cell of claim 3, wherein, a projection of the second active material layer along the thickness direction partially overlaps with a projection of the first insulator along the thickness direction; and / or, a projection of the fourth active material layer along the thickness direction partially overlaps with a projection of the second insulator along the thickness direction.

5. The battery cell of claim 3, wherein, a first dimension L1 of the first active material layer along the first direction, a second dimension L2 of the second active material layer along the first direction, and a third dimension L3 of the first insulator along the first direction satisfy a relationship: L2≤L1+L3.

6. The battery cell of claim 5, wherein, the first dimension L1 satisfies a relationship: 20mm≤L1≤2000mm, and the third dimension L3 satisfies a relationship: 15μm≤L3≤2000μm.

7. The battery cell of claim 6, wherein, the first dimension L1 satisfies a relationship: 40mm≤L1≤1000mm, and the third dimension L3 satisfies a relationship: 30μm≤L3≤1000μm.

8. The battery cell of claim 3, wherein, a fourth dimension L4 of the third active material layer along the first direction, a fifth dimension L5 of the fourth active material layer along the first direction, and a sixth dimension L6 of the second insulator along the first direction satisfy a relationship: L5≤L4+L6.

9. The battery cell of claim 8, wherein, the fourth dimension L4 satisfies a relationship: 20mm≤L4≤2000mm, and the sixth dimension L6 satisfies a relationship: 15μm≤L6≤2000μm.

10. The battery cell of claim 9, wherein, the fourth dimension L4 satisfies a relationship: 40mm≤L4≤1000mm, and the sixth dimension L6 satisfies a relationship: 30μm≤L6≤1000μm.

11. The battery cell of claim 3, wherein, a first dimension L1 of the first active material layer along the first direction and a fourth dimension L4 of the third active material layer along the first direction satisfy a relationship: -2mm≤L1-L4≤2mm.

12. The battery cell of claim 11, wherein, the first dimension L1 and the fourth dimension L4 satisfy a relationship: -0.5mm≤L1-L4≤0.5mm.

13. The battery cell of claim 3, wherein, a side surface of the first insulator along the thickness direction away from the first current collector is flush with a side surface of the fourth active material layer along the thickness direction away from the second current collector; and / or, a side surface of the second insulator along the thickness direction away from the second current collector is flush with a side surface of the first active material layer along the thickness direction away from the first current collector.

14. The battery cell of claim 1, wherein, the solid-state electrolyte includes a first electrolyte layer and a second electrolyte layer, the first electrolyte layer and the second electrolyte layer being respectively coated on two side surfaces of the second tab body along the thickness direction.

15. The battery cell of claim 1, wherein, the battery monomer further includes a support component, the first tab and the second tab being wound around the support component.

16. The battery cell of claim 15, wherein, a side surface of the first insulator along the first direction away from the second tab body is flush with a side end surface of the support component along the first direction close to the first lug; and / or, a side surface of the second insulator along the first direction away from the first tab body is flush with a side end surface of the support component along the first direction close to the second lug.

17. The battery cell of claim 1, wherein, in the winding direction, both ends of the second tab exceed both ends of the first tab; The electrode assembly further includes a second insulating member connected to both ends of the first tab in the winding direction and insulating the first tab and the second tab.

18. A battery device characterized by comprising: A plurality of the battery cell according to any one of claims 1 to 17.

19. An electrical device, comprising: The battery cell according to any one of claims 1 to 17 or the battery device according to claim 18, for storing or providing electric power.

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