Battery appatatus and electric device

Abstract

Provided in the embodiments of the present application are a battery cell, a battery, an electric device, and a battery manufacturing device and method, belonging to the technical field of batteries. The battery cell comprises a housing and an electrode assembly disposed within the housing. The electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a first solid-state electrolyte layer, wherein the positive electrode sheet and the negative electrode sheet are stacked in a first direction. A first negative active material layer is provided in a coating region of a negative current collector of the negative electrode sheet, and the first solid-state electrolyte layer is disposed between the positive electrode sheet and the first negative active material layer; in the first direction, the projected area of the first negative active material layer on the negative current collector is greater than the projected area of the positive electrode sheet on the negative current collector. The electrode assembly further comprises a support member made of an insulating material. The support member is disposed in a bare foil region of the negative current collector and located on the outer periphery of the first negative active material layer, the first solid-state electrolyte layer, and the positive electrode sheet, so as to support the portion of the negative electrode sheet protruding beyond the positive electrode sheet, thereby improving the reliability of the battery cell.

Description

Battery devices and electrical equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510361777.9, filed on March 26, 2025, entitled “Battery cell, battery, electrical device, battery manufacturing equipment and method”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, specifically to a battery cell, battery, electrical device, battery manufacturing equipment and method. Background Technology

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

[0005] In battery technology, the reliability of individual battery cells is a crucial issue. Therefore, improving the reliability of individual battery cells is a pressing technical problem that needs to be solved. Summary of the Invention

[0006] In view of the above problems, this application provides a battery cell, a battery, an electrical device, a battery manufacturing apparatus and method to support the portion of the negative electrode sheet that protrudes from the positive electrode sheet, thereby improving the reliability of the battery cell.

[0007] In a first aspect, this application provides a battery cell, comprising: a casing and an electrode assembly, the electrode assembly being disposed within the casing, the electrode assembly including a positive electrode, a negative electrode, and a first solid electrolyte layer, the positive electrode and the negative electrode being stacked along a first direction; the negative electrode including a negative current collector and a first negative active material layer, the negative current collector having a first surface along the first direction, the first surface including a coated area and an empty foil area, the coated area being provided with the first negative active material layer, the empty foil area not being provided with the first negative active material layer, and the empty foil area being disposed on the coated area. The outer periphery of the coating area; the positive electrode sheet is located on the side of the first negative electrode active material layer facing away from the negative electrode current collector, and the first solid electrolyte layer is disposed between the positive electrode sheet and the first negative electrode active material layer; along the first direction, the projected area of ​​the first negative electrode active material layer on the negative electrode current collector is larger than the projected area of ​​the positive electrode sheet on the negative electrode current collector; wherein, the electrode assembly further includes a support member, the support member is made of insulating material, the support member is disposed in the empty foil area, and the support member is located on the outer periphery of the first negative electrode active material layer, the first solid electrolyte layer and the positive electrode sheet.

[0008] In the technical solution of this application embodiment, a support member is provided in the empty foil area of ​​the negative electrode current collector, and this support member is located on the outer periphery of the first negative electrode active material layer, the first solid electrolyte layer, and the positive electrode sheet. This supports the portion of the negative electrode sheet protruding from the positive electrode sheet, reducing the possibility of bending or breaking of this portion under pressure, thereby improving the reliability of the battery cell. Furthermore, a relatively stable connection can be established between the empty foil area of ​​the negative electrode current collector and the support member, further enhancing the reliability of the battery cell.

[0009] In some embodiments, the support includes a first support portion and a second support portion, the first support portion being connected between the empty foil area and the second support portion, the first support portion being arranged around the outer periphery of the first negative electrode active material layer and the first solid electrolyte layer, and the second support portion being arranged around the outer periphery of the positive electrode sheet.

[0010] The support consists of a first support portion and a second support portion. The first support portion can wrap around the first negative electrode active material layer and the first solid electrolyte layer along the circumference of the electrode assembly, while providing a relatively stable accommodating space for the first negative electrode active material layer and the first solid electrolyte layer. The second support portion can wrap around the positive electrode sheet along the circumference of the electrode assembly, while also providing a relatively stable accommodating space for the positive electrode sheet.

[0011] In some embodiments, along the first direction, the thickness of the first support portion is the same as the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer, and the thickness of the second support portion is the same as the thickness of the positive electrode sheet.

[0012] By making the thickness of the first support portion consistent with the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer, and the thickness of the second support portion consistent with the thickness of the positive electrode sheet, scratches between the first support portion and the positive electrode sheet, as well as scratches between the second support portion and the first solid electrolyte layer, can be avoided.

[0013] In some embodiments, the outer edges of the first support portion and the second support portion are flush with the outer edge of the negative electrode current collector.

[0014] By making the outer edges of the first support and the second support flush with the outer edge of the negative current collector, a relatively flat outer wall of the electrode assembly is formed.

[0015] In some embodiments, along the second direction, the width of the first support portion is smaller than the width of the second support portion; along the third direction, the width of the first support portion is smaller than the width of the second support portion; the first direction, the second direction, and the third direction are perpendicular to each other.

[0016] By making the width of the first support portion along both the second and third directions smaller than the width of the second support portion, the width of the first negative electrode active material layer along both the second and third directions can be made larger than the width of the second support portion. This allows the projected area of ​​the first negative electrode active material layer on the negative electrode current collector to be larger than the projected area of ​​the positive electrode sheet on the negative electrode current collector, thereby reducing the occurrence of lithium plating during battery charging.

[0017] In some embodiments, the negative current collector further has a second surface opposite to the first surface along the first direction; the negative electrode sheet further includes a second negative active material layer, the second negative active material layer is disposed on the second surface, and the outer edge of the second negative active material layer is flush with the outer edge of the negative current collector.

[0018] At this time, negative electrode active material layers will be provided on both sides of the negative electrode current collector along the first direction. By making the outer edge of the second negative electrode active material layer flush with the outer edge of the negative electrode current collector, the area of ​​the second negative electrode active material layer can be made consistent with the area of ​​the negative electrode current collector, reducing the possibility of a protruding edge forming between the negative electrode current collector and the second negative electrode active material layer due to inconsistent areas.

[0019] In some embodiments, the electrode assembly further includes a second solid electrolyte layer disposed on the side of the second negative electrode active material layer facing away from the negative electrode current collector, and the outer edge of the second solid electrolyte layer is flush with the outer edge of the second negative electrode active material layer.

[0020] By providing a second solid electrolyte layer on the side of the second negative electrode active material layer facing away from the negative electrode current collector, the possibility of short circuits between adjacent electrode components can be reduced when the electrode components are stacked. Furthermore, since the outer edge of the second solid electrolyte layer is flush with the outer edge of the second negative electrode active material layer, the area of ​​the second solid electrolyte layer can be made consistent with the area of ​​the second negative electrode active material layer, reducing the possibility of a protruding edge forming between the two layers due to area discrepancies.

[0021] In some embodiments, the positive electrode sheet includes a first positive active material layer, a positive current collector, and a second positive active material layer stacked along the first direction. The first positive active material layer and the second positive active material layer are respectively coated on opposite sides of the positive current collector along the first direction. Along the first direction, the projected area of ​​the first negative active material layer on the negative current collector is larger than the projected area of ​​the positive current collector on the negative current collector. The outer edges of the first positive active material layer and the second positive active material layer are flush with the outer edge of the positive current collector.

[0022] At this time, the positive electrode sheet is composed of a positive current collector and positive active material layers disposed on both sides of the positive current collector along the first direction. By making the projected area of ​​the first negative active material layer on the negative current collector larger than the projected area of ​​the positive current collector on the negative current collector, and making the outer edges of the first positive active material layer and the second positive active material layer flush with the outer edge of the positive current collector, the projected area of ​​the first negative active material layer on the negative current collector can be larger than the projected area of ​​the positive electrode sheet on the negative current collector, thereby reducing the occurrence of lithium plating during battery charging.

[0023] In some embodiments, the support is a UV insulating adhesive.

[0024] The support components are made of UV insulating adhesive to achieve both insulation and support functions.

[0025] Secondly, this application provides a battery that includes the battery cell described in the above embodiments.

[0026] The battery provided according to this application includes the battery cell described in any one of the first aspect embodiments, and therefore has the technical effects described in any of the above embodiments, which will not be repeated here.

[0027] Thirdly, this application provides an electrical device that includes the battery described in the above embodiments.

[0028] The electrical equipment provided according to this application includes the battery described in any one of the first aspect embodiments, and therefore has the technical effects described in any of the above embodiments, which will not be repeated here.

[0029] Fourthly, this application provides a battery manufacturing apparatus suitable for manufacturing electrode assemblies of battery cells in the above embodiments. The battery manufacturing apparatus includes a feeding device, a cleaning device, a filling device, and a cutting device. The feeding device is used to provide a substrate, which includes a negative electrode current collector layer, a first negative electrode active material layer coated on a first surface of the negative electrode current collector layer, and a first solid electrolyte layer coated on the first negative electrode active material layer. The cleaning device is used to clean the substrate to remove part of the first solid electrolyte layer and part of the first negative electrode active material layer, forming multiple coating areas with the first negative electrode active material layer and empty foil areas without the first negative electrode active material layer on the negative electrode current collector layer. The multiple coating areas are spaced apart from each other along the length direction of the substrate, and an empty foil area is arranged around the outer periphery of each coating area. The filling device is used to fill each empty foil area with support material to form a support member. The cutting device is used to cut the position between two adjacent coating areas after the support member is formed to form the negative electrode sheet with the support member.

[0030] In the technical solution of this application embodiment, during the manufacturing of the electrode assembly, the substrate is first cleaned by a cleaning device to expose the empty foil area of ​​the negative electrode current collector layer. Then, a filling device fills the empty foil area with supporting material to form a support. After the support is formed, a cutting device cuts the position between two adjacent coating areas to form a negative electrode sheet with the support. The negative electrode sheet and the support will form a stacking space suitable for stacking positive electrode sheets. The electrode assembly manufactured by this battery manufacturing equipment can establish a relatively stable connection between the empty foil area and the support, and can also support the part of the negative electrode sheet that protrudes from the positive electrode sheet, reducing the possibility of the part of the negative electrode sheet protruding from the positive electrode sheet bending or breaking under pressure, thereby improving the reliability of the battery cell.

[0031] In some embodiments, the support member includes a first support portion and a second support portion; the filling device includes a first filling mechanism and a second filling mechanism; the first filling mechanism is used to fill each of the empty foil areas with a support material whose thickness is consistent with the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer to form the first support portion; the second filling mechanism is used to fill the side of the first support portion opposite to the negative electrode current collector layer with a support material whose thickness is consistent with the thickness of the positive electrode sheet to form the second support portion.

[0032] Therefore, when the support is composed of a first support part and a second support part, the two support parts can be processed in steps by the first filling mechanism and the second filling mechanism respectively.

[0033] Fifthly, this application provides a battery manufacturing method applicable to manufacturing electrode assemblies for the battery cells described in the above embodiments, the battery manufacturing method comprising:

[0034] A substrate is provided; wherein the substrate includes at least a negative electrode current collector layer, a first negative electrode active material layer coated on a first surface of the negative electrode current collector layer, and a first solid electrolyte layer coated on the first negative electrode active material layer;

[0035] The substrate is cleaned to remove part of the first solid electrolyte layer and part of the first negative electrode active material layer. Multiple coating areas with the first negative electrode active material layer and empty foil areas without the first negative electrode active material layer are formed on the negative electrode current collector layer. The multiple coating areas are spaced apart from each other along the length direction of the substrate, and an empty foil area is arranged around the outer periphery of each coating area.

[0036] Fill each of the empty foil areas with support material to form a support member;

[0037] After the support is formed, the position between two adjacent coating areas is cut to form the negative electrode sheet with the support.

[0038] The positive electrode is stacked within the stacked space formed by the support and the negative electrode to form an electrode assembly.

[0039] In the technical solution of this application embodiment, during the manufacturing of the electrode assembly, the substrate is first cleaned to expose the empty foil area of ​​the negative electrode current collector layer, and then the empty foil area is filled with support material to form a support. After the support is formed, the position between two adjacent coating areas is cut to form a negative electrode sheet with the support. The negative electrode sheet and the support will form a stacking space suitable for stacking positive electrode sheets, so that the positive and negative electrode sheets can be stacked to form an electrode assembly. The electrode assembly manufactured by this battery manufacturing method can establish a relatively stable connection between the empty foil area and the support, and can also support the part of the negative electrode sheet that protrudes from the positive electrode sheet, reducing the possibility of the part of the negative electrode sheet protruding from the positive electrode sheet bending or breaking under pressure, thereby improving the reliability of the battery cell.

[0040] In some embodiments, the support member includes a first support portion and a second support portion;

[0041] The step of filling each of the empty foil areas with support material to form a support includes:

[0042] Each of the empty foil regions is filled with a support material whose thickness is the same as the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer, to form the first support portion;

[0043] A support material with a thickness consistent with that of the positive electrode sheet is filled into the side of the first support portion opposite to the negative electrode current collector layer to form the second support portion.

[0044] Therefore, when the support is composed of a first support part and a second support part, the two support parts can be processed in steps.

[0045] 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 other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. 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:

[0047] Figure 1 is a schematic diagram of the vehicle structure in some embodiments of this application;

[0048] Figure 2 is an exploded structural diagram of the battery in some embodiments of this application;

[0049] Figure 3 is a schematic diagram of the exploded structure of a battery cell in some embodiments of this application;

[0050] Figure 4 is a schematic diagram of the structure of the electrode assembly in a battery cell in some embodiments of this application;

[0051] Figure 5 is a schematic diagram of the structure of the positive electrode sheet in a battery cell in some embodiments of this application;

[0052] Figure 6 is a schematic diagram of the assembly of the negative electrode, the first solid electrolyte layer and the second solid electrolyte layer in a battery cell in some embodiments of this application.

[0053] Figure 7 is a schematic diagram of Figure 6 from another angle;

[0054] Figure 8 is a schematic diagram of the assembly of the negative electrode, the first solid electrolyte layer, the second solid electrolyte layer and the support in a battery cell in some embodiments of this application.

[0055] Figure 9 is a schematic diagram of the stacking of electrode components in a battery cell in some embodiments of this application;

[0056] Figure 10 is a schematic diagram of the structure of a battery manufacturing apparatus in some embodiments of this application;

[0057] Figure 11 is a schematic flowchart of a battery manufacturing method in some embodiments of this application.

[0058] The reference numerals in the detailed embodiments are as follows:

[0059] 1000, Vehicle; 100, Battery; 200, Controller; 300, Motor; 10, Housing; 11, First Part; 12, Second Part; 20, Battery Cell; 21, Shell; 211, End Cap; 212, Housing; 22, Electrode Assembly; 221, Positive Electrode; 2211, First Positive Active Material Layer; 2212, Positive Current Collector; 2213, Second Positive Active Material Layer; 222, Negative Electrode; 2221, Negative Current Collector; a, First Surface; a1, Coated Area; a2, Empty Foil Area; b, Second Surface; 2222, First Negative Active Material Layer; 2223, Second Negative Active Material Layer; 223, First Solid Electrolyte Layer; 224, Support; 2241, First Support Part; 2242, Second Support Part; 225, Second Solid Electrolyte Layer; 23, Terminal Post; 2000 Battery manufacturing equipment; 400 Feeding device; 500 Cleaning device; 600 Filling device; 601 First filling mechanism; 602 Second filling mechanism; 700 Cutting device. Embodiments of the present invention

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

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 description of the drawings are intended to cover non-exclusive inclusion.

[0062] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0063] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0064] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0065] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0067] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0068] The inventors have noted that in electrode assemblies, the negative electrode is typically larger than the positive electrode in at least one of the length and width directions. Because the protruding area of ​​the negative electrode has relatively weak overall structural strength, it can bend under pressure during isostatic pressing of the electrode assembly. After bending, fracture may occur at the boundary between the protruding area and the normal pressure zone, and the burrs generated at the fracture edge may puncture the separator. Furthermore, the protruding area may cause overlap between the positive and negative electrodes, resulting in a short circuit between them and posing a significant safety hazard to the battery.

[0069] To reduce the above safety hazards, the applicant discovered that insulating supports can be installed on both sides of the protruding area along the thickness direction of the negative electrode sheet, so as to cope with the pressure under isostatic pressure.

[0070] However, in existing technologies, to simplify the lamination process, the separator is typically coated directly onto both surfaces of the negative electrode during manufacturing, forming an assembly with the negative electrode. This assembly is then stacked with the positive electrode to form the electrode assembly. However, the separator has relatively weak adhesion. If the insulating support is directly placed on the separator, there is a significant risk of slippage, posing a considerable safety hazard to the battery.

[0071] Based on the above considerations, to address the significant safety hazards associated with batteries, a new battery cell was designed. A support component is placed in the empty foil area of ​​the negative electrode current collector, and this support component is positioned on the outer periphery of the first negative electrode active material layer, the first solid electrolyte layer, and the positive electrode sheet. This supports the portion of the negative electrode sheet protruding from the positive electrode sheet, reducing the likelihood of bending or breakage under pressure, thereby improving the reliability of the battery cell. Furthermore, a relatively stable connection can be established between the empty foil area of ​​the negative electrode current collector and the support component, further enhancing the reliability of the battery cell.

[0072] The batteries disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using batteries or similar components disclosed in this application.

[0073] The technical solutions described in this application are applicable to various battery-powered devices, such as 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.

[0074] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0075] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000, or it can be used in the vehicle 1000's electrical system, such as to meet the power requirements for starting, navigation, and operation of the vehicle 1000.

[0076] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0077] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides space for the battery cells 20, and the housing 10 can adopt various structures.

[0079] In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, and together define a receiving space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the receiving space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0080] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include current-connecting components (such as the first current-connecting component 40 and the second current-connecting component 50 shown in Figure 5) for electrical connection between the multiple battery cells 20.

[0081] Each battery cell 20 can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0082] Please refer to Figure 3, which is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. As shown in Figure 3, the battery cell 20 includes a casing 21, electrode components 22, and other functional parts.

[0083] The outer casing 21 includes an end cap 211 and a housing 212. The end cap 211 is a component that covers the opening of the housing 212 to isolate the internal environment of the battery cell 20 from the external environment. In any case, the shape of the end cap 211 may be adapted to the shape of the housing 212 to fit the housing 212.

[0084] Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy). This makes the end cap 211 less prone to deformation under pressure and impact, allowing the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as terminals 23 can be provided on the end cap 211. Terminals 23 can be used to electrically connect to the electrode assembly 22 for outputting or inputting electrical energy into the battery cell 20. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 211. The insulating member can be used to isolate the electrical connection components within the housing 212 from the end cap 211 to reduce the risk of short circuits. For example, the insulating member can be plastic, rubber, etc.

[0085] The housing 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 212 and the end cap 211 can be independent components. An opening can be provided on the housing 212, and the end cap 211 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 211 and the housing 212 can be integrated. Specifically, the end cap 211 and the housing 212 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 212, the end cap 211 closes the housing 212. The housing 212 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0086] Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur. The casing 212 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by stacking negative and positive electrode plates, and typically a separator is provided between the negative and positive electrode plates. The portions of the negative and positive electrode plates containing active material constitute the main body of the electrode assembly, while the portions of the negative and positive electrode plates without active material each constitute a tab. The negative and positive tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the negative and positive active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0087] According to some embodiments of this application, referring to FIG3, and further referring to FIGS. 4 to 9, FIG4 is a structural schematic diagram of the electrode assembly in a battery cell according to some embodiments of this application; FIG5 is a structural schematic diagram of the positive electrode in a battery cell according to some embodiments of this application; FIGS. 6 and 7 are assembly schematic diagrams of the negative electrode, the first solid electrolyte layer and the second solid electrolyte layer in a battery cell according to some embodiments of this application; FIG. 8 is an assembly schematic diagram of the negative electrode, the first solid electrolyte layer, the second solid electrolyte layer and the support member in a battery cell according to some embodiments of this application; FIG. 9 is a stacked schematic diagram of the electrode assembly in a battery cell according to some embodiments of this application. This application provides a battery cell 20, including a housing 21 and an electrode assembly 22. The electrode assembly 22 is disposed within the housing 21 and includes a positive electrode 221, a negative electrode 222 and a first solid electrolyte layer 223. The positive electrode 221 and the negative electrode 222 are stacked along a first direction.

[0088] The negative electrode 222 includes a negative current collector 2221 and a first negative active material layer 2222. The negative current collector 2221 has a first surface a along a first direction. The first surface a includes a coating area a1 and an empty foil area a2. The coating area a1 is provided with the first negative active material layer 2222, and the empty foil area a2 is not provided with the first negative active material layer 2222. The empty foil area a2 is located on the outer periphery of the coating area a1. The positive electrode 221 is located on the side of the first negative active material layer 2222 that faces away from the negative current collector 2221. A first solid electrolyte layer 223 is disposed between the positive electrode 221 and the first negative active material layer 2222. Along the first direction, the projected area of ​​the first negative active material layer 2222 on the negative current collector 2221 is larger than the projected area of ​​the positive electrode 221 on the negative current collector 2221.

[0089] The electrode assembly 22 also includes a support member 224, which is made of insulating material. The support member 224 is disposed in the empty foil area a2 and is located on the outer periphery of the first negative electrode active material layer 2222, the first solid electrolyte layer 223 and the positive electrode sheet 221.

[0090] The first solid electrolyte layer 223 uses a solid electrolyte as a separator. The solid electrolyte is placed between the positive and negative electrodes, and serves to both transport ions and isolate the positive and negative electrodes.

[0091] The negative electrode current collector 2221 can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc.

[0092] The negative electrode active material selected for the first negative electrode active material layer 2222 can be a negative electrode active material known in the art for use in batteries. 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 for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0093] In the technical solution of this application embodiment, a support member 224 is provided in the empty foil area a2 of the negative electrode current collector 2221, and the support member 224 is located on the outer periphery of the first negative electrode active material layer 2222, the first solid electrolyte layer 223, and the positive electrode sheet 221. This supports the portion of the negative electrode sheet 222 that protrudes from the positive electrode sheet 221, reducing the possibility of bending or breaking of the portion of the negative electrode sheet 222 protruding from the positive electrode sheet 221 under pressure, thereby improving the reliability of the battery cell 20. In addition, a relatively stable connection can be established between the empty foil area a2 of the negative electrode current collector 2221 and the support member 224, which can further improve the reliability of the battery cell 20.

[0094] According to some embodiments of this application, optionally, please continue to refer to FIG4 and FIG8, the support member 224 includes a first support portion 2241 and a second support portion 2242. The first support portion 2241 is connected between the empty foil region a2 and the second support portion 2242. The first support portion 2241 is disposed around the outer periphery of the first negative electrode active material layer 2222 and the first solid electrolyte layer 223, and the second support portion 2242 is disposed around the outer periphery of the positive electrode sheet 221.

[0095] The support member 224 is composed of a first support portion 2241 and a second support portion 2242. The first support portion 2241 can wrap around the first negative electrode active material layer 2222 and the first solid electrolyte layer 223 along the circumference of the electrode assembly 22, while providing a relatively stable accommodating space for the first negative electrode active material layer 2222 and the first solid electrolyte layer 223. The second support portion 2242 can wrap around the positive electrode sheet 221 along the circumference of the electrode assembly 22, while also providing a relatively stable accommodating space for the positive electrode sheet 221.

[0096] Optionally, according to some embodiments of this application, please continue to refer to FIG4 and FIG8, along the first direction, the thickness of the first support portion 2241 is consistent with the sum of the thicknesses of the first negative electrode active material layer 2222 and the first solid electrolyte layer 223, and the thickness of the second support portion 2242 is consistent with the thickness of the positive electrode sheet 221.

[0097] By making the thickness of the first support portion 2241 the same as the sum of the thicknesses of the first negative electrode active material layer 2222 and the first solid electrolyte layer 223, and the thickness of the second support portion 2242 the same as the thickness of the positive electrode sheet 221, friction between the first support portion 2241 and the positive electrode sheet 221 can be avoided, as can friction between the second support portion 2242 and the first solid electrolyte layer 223.

[0098] According to some embodiments of this application, optionally, please continue to refer to Figures 4 and 8, the outer edges of the first support portion 2241 and the second support portion 2242 are both flush with the outer edge of the negative electrode current collector 2221.

[0099] By making the outer edges of the first support portion 2241 and the second support portion 2242 flush with the outer edge of the negative electrode current collector 2221, the outer peripheral surfaces of the first support portion 2241 and the second support portion 2242 are smoothly connected to the outer peripheral surface of the negative electrode current collector 2221, thereby forming a relatively flat outer wall of the electrode assembly 22.

[0100] Optionally, according to some embodiments of this application, referring to Figures 5 to 7, along the second direction, the width of the first support portion 2241 is smaller than the width of the second support portion 2242. Along the third direction, the width of the first support portion 2241 is smaller than the width of the second support portion 2242. The first direction, the second direction, and the third direction are perpendicular to each other.

[0101] The second direction is the width direction of the electrode assembly 22, and the third direction is the length direction of the electrode assembly 22.

[0102] By making the width of the first support portion 2241 along both the second and third directions smaller than the width of the second support portion 2242, the width of the first negative electrode active material layer 2222 along both the second and third directions can be greater than the width of the second support portion 2242. This allows the projected area of ​​the first negative electrode active material layer 2222 on the negative electrode current collector 2221 to be greater than the projected area of ​​the positive electrode sheet 221 on the negative electrode current collector 2221, thereby reducing the occurrence of lithium plating during battery charging.

[0103] According to some embodiments of this application, optionally, please continue to refer to FIG4 and FIG8, the negative electrode current collector 2221 also has a second surface b opposite to the first surface a along the first direction.

[0104] The negative electrode 222 also includes a second negative electrode active material layer 2223, which is disposed on the second surface b, and the outer edge of the second negative electrode active material layer 2223 is flush with the outer edge of the negative electrode current collector 2221.

[0105] The negative electrode active material selected for the second negative electrode active material layer 2223 can be a negative electrode active material known in the art for use in batteries. 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 for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0106] At this time, negative electrode active material layers will be provided on both sides of the negative electrode current collector 2221 along the first direction. By making the outer edge of the second negative electrode active material layer 2223 flush with the outer edge of the negative electrode current collector 2221, the area of ​​the second negative electrode active material layer 2223 can be made consistent with the area of ​​the negative electrode current collector 2221, reducing the possibility of a protruding edge forming between the negative electrode current collector 2221 and the second negative electrode active material layer 2223 due to inconsistent areas.

[0107] According to some embodiments of this application, optionally, please continue to refer to Figures 4 to 9, the electrode assembly 22 further includes a second solid electrolyte layer 225, which is disposed on the side of the second negative electrode active material layer 2223 facing away from the negative electrode current collector 2221, and the outer edge of the second solid electrolyte layer 225 is flush with the outer edge of the second negative electrode active material layer 2223.

[0108] The second solid electrolyte layer 225 uses a solid electrolyte as a separator. When the electrode assemblies 22 are stacked, the second solid electrolyte layer 225 is disposed between the positive and negative electrodes of two adjacent electrode assemblies 22, and serves to both transport ions and isolate the positive and negative electrodes.

[0109] By providing a second solid electrolyte layer 225 on the side of the second negative electrode active material layer 2223 facing away from the negative electrode current collector 2221, the possibility of short circuits between adjacent electrode assemblies 22 can be reduced when the electrode assemblies 22 are stacked. Furthermore, since the outer edge of the second solid electrolyte layer 225 is flush with the outer edge of the second negative electrode active material layer 2223, the area of ​​the second solid electrolyte layer 225 can be made consistent with the area of ​​the second negative electrode active material layer 2223, reducing the possibility of a protruding edge forming between the second solid electrolyte layer 225 and the second negative electrode active material layer 2223 due to area discrepancies.

[0110] Optionally, according to some embodiments of this application, please continue to refer to Figures 4 to 9, the positive electrode 221 includes a first positive electrode active material layer 2211, a positive electrode current collector 2212, and a second positive electrode active material layer 2213 stacked along a first direction. The first positive electrode active material layer 2211 and the second positive electrode active material layer 2213 are respectively coated on opposite sides of the positive electrode current collector 2212 along the first direction. A first solid electrolyte layer 223 is disposed between the first positive electrode active material layer 2211 and the first negative electrode active material layer 2222.

[0111] Along the first direction, the projected area of ​​the first negative electrode active material layer 2222 on the negative electrode current collector 2221 is greater than the projected area of ​​the positive electrode current collector 2212 on the negative electrode current collector 2221.

[0112] The outer edges of the first positive electrode active material layer 2211 and the second positive electrode active material layer 2213 are flush with the outer edge of the positive electrode current collector 2212.

[0113] As an example, the positive electrode current collector 2212 can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. 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 alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0114] As an example, the positive electrode active material selected for the first positive electrode active material layer 2211 and the second positive electrode active material layer 2213 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 of batteries may also be used.

[0115] At this time, the positive electrode 221 consists of a positive current collector 2212 and positive active material layers disposed on both sides of the positive current collector 2212 along the first direction. By making the projected area of ​​the first negative active material layer 2222 on the negative current collector 2221 larger than the projected area of ​​the positive current collector 2212 on the negative current collector 2221, and by making the outer edges of the first positive active material layer 2211 and the second positive active material layer 2213 flush with the outer edge of the positive current collector 2212, the projected area of ​​the first negative active material layer 2222 on the negative current collector 2221 can be larger than the projected area of ​​the positive electrode 221 on the negative current collector 2221, thereby reducing the occurrence of lithium plating during battery charging.

[0116] According to some embodiments of this application, optionally, please continue to refer to Figures 4 to 9, the support member 224 is a UV (Ultraviolet Rays) insulating adhesive, that is, an ultraviolet light curing adhesive.

[0117] The support member 224 is made of UV insulating adhesive to achieve the insulation and support functions of the support member 224.

[0118] According to some embodiments of this application, this application provides a battery 100. The battery 100 includes a battery cell 20 according to any of the above embodiments.

[0119] According to some embodiments of this application, this application also provides an electrical device including a battery of any of the above-described schemes, and the battery is used to provide electrical energy to the electrical device.

[0120] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0121] According to some embodiments of this application, please refer to FIG10. This application provides a battery manufacturing equipment 2000, which is suitable for manufacturing electrode assembly 22 of battery cell 20 in any of the above schemes. The battery manufacturing equipment 2000 includes a feeding device 400, a cleaning device 500, a filling device 600, and a cutting device 700. The feeding device 400 is used to provide a substrate, which includes a negative electrode current collector layer, a first negative electrode active material layer 2222 coated on a first surface a of the negative electrode current collector layer, and a first solid electrolyte layer 223 coated on the first negative electrode active material layer 2222.

[0122] The feeding device 400 may include an unwinding mechanism, a roller mechanism, and a correction mechanism. The unwinding mechanism is used to provide the wound substrate, the roller mechanism is used to convey the substrate after it is unwound from the unwinding mechanism, and the correction mechanism is used to adjust the conveying direction of the substrate to prevent the substrate from tilting.

[0123] The cleaning device 500 is used to clean the substrate to remove part of the first solid electrolyte layer 223 and part of the first negative electrode active material layer 2222. Multiple coating areas a1 with the first negative electrode active material layer 2222 and empty foil areas a2 without the first negative electrode active material layer 2222 are formed on the negative electrode current collector layer. The multiple coating areas a1 are spaced apart from each other along the length direction of the substrate, and an empty foil area a2 is arranged around the outer periphery of each coating area a1.

[0124] The cleaning device 500 can be a laser cleaning device. Therefore, when cleaning the substrate, laser cleaning will be used to remove part of the first solid electrolyte layer 223 and part of the first negative electrode active material layer 2222.

[0125] The filling device 600 is used to fill each empty foil area a2 with support material to form a support 224.

[0126] The supporting material can be UV insulating adhesive.

[0127] The cutting device 700 is used to cut the position between two adjacent coating areas a1 after the support member 224 is formed, so as to form a negative electrode sheet 222 with the support member 224.

[0128] In the technical solution of this application embodiment, when manufacturing the electrode assembly 22, the substrate is first cleaned by the cleaning device 500 to expose the empty foil area a2 of the negative electrode current collector layer. Then, the empty foil area a2 is filled with support material by the filling device 600 to form a support member 224. After the support member 224 is formed, the position between two adjacent coating areas a1 is cut by the cutting device 700 to form a negative electrode sheet 222 with the support member 224. The negative electrode sheet 222 and the support member 224 will form a stacking space suitable for stacking the positive electrode sheet 221. The electrode assembly 22 manufactured by this battery manufacturing equipment 2000 can establish a relatively stable connection between the empty foil area a2 and the support member 224, and can also support the part of the negative electrode sheet 222 that protrudes from the positive electrode sheet 221, reducing the possibility of the part of the negative electrode sheet 222 protruding from the positive electrode sheet 221 bending or breaking under pressure, thereby improving the reliability of the battery cell 20.

[0129] According to some embodiments of this application, optionally, referring to FIG10, the support member 224 includes a first support portion 2241 and a second support portion 2242.

[0130] The filling device 600 includes a first filling mechanism 601 and a second filling mechanism 602.

[0131] The first filling mechanism 601 is used to fill each empty foil area a2 with a support material whose thickness is the same as the sum of the thicknesses of the first negative electrode active material layer 2222 and the first solid electrolyte layer 223, so as to form the first support portion 2241.

[0132] The second filling mechanism 602 is used to fill the side of the first support portion 2241 opposite to the negative electrode current collector layer with a support material of the same thickness as the positive electrode sheet 221, so as to form the second support portion 2242.

[0133] When the support material is selected as UV insulating adhesive, both the first filling mechanism 601 and the second filling mechanism 602 can be selected as UV printing mechanisms.

[0134] Therefore, when the support member 224 is composed of the first support part 2241 and the second support part 2242, the two support parts can be processed in steps by the first filling mechanism 601 and the second filling mechanism 602 respectively, so as to improve the processing accuracy.

[0135] According to some embodiments of this application, please refer to FIG11. This application provides a battery manufacturing method, which is applicable to manufacturing the electrode assembly 22 of the battery cell 20 in any of the above embodiments. The battery manufacturing method includes:

[0136] Step S1: Provide a substrate. The substrate includes at least a negative electrode current collector layer, a first negative electrode active material layer 2222 coated on a first surface a of the negative electrode current collector layer, and a first solid electrolyte layer 223 coated on the first negative electrode active material layer 2222.

[0137] Step S2: Clean the substrate to remove part of the first solid electrolyte layer 223 and part of the first negative electrode active material layer 2222. Multiple coating areas a1 with the first negative electrode active material layer 2222 and empty foil areas a2 without the first negative electrode active material layer 2222 are formed on the negative electrode current collector layer. The multiple coating areas a1 are spaced apart from each other along the length of the substrate, and an empty foil area a2 is arranged around the outer periphery of each coating area a1.

[0138] Step S3: Fill each empty foil area a2 with support material to form support 224.

[0139] Step S4: After the support member 224 is formed, the position between two adjacent coating areas a1 is cut to form a negative electrode sheet 222 with the support member 224.

[0140] Step S5: Stack the positive electrode 221 into the stacked space formed by the support member 224 and the negative electrode 222 to form the electrode assembly 22.

[0141] In the technical solution of this application embodiment, when manufacturing the electrode assembly 22, the substrate is first cleaned to expose the empty foil area a2 of the negative electrode current collector layer, and then the empty foil area a2 is filled with support material to form a support member 224. After the support member 224 is formed, the position between two adjacent coating areas a1 is cut to form a negative electrode sheet 222 with the support member 224. The negative electrode sheet 222 and the support member 224 will form a stacking space suitable for stacking the positive electrode sheet 221, so that the positive electrode sheet 221 and the negative electrode sheet 222 can be stacked to form the electrode assembly 22. The electrode assembly 22 manufactured by this battery manufacturing method can establish a relatively stable connection between the empty foil area a2 and the support member 224, and can also support the part of the negative electrode sheet 222 that protrudes from the positive electrode sheet 221, reducing the possibility of the part of the negative electrode sheet 222 protruding from the positive electrode sheet 221 bending or breaking under pressure, thereby improving the reliability of the battery cell 20.

[0142] According to some embodiments of this application, optionally, please continue to refer to Figures 5 to 7, the support member 224 includes a first support portion 2241 and a second support portion 2242.

[0143] The step of filling each empty foil area a2 with support material to form support 224 includes:

[0144] Each empty foil region a2 is filled with a support material whose thickness is the same as the sum of the thicknesses of the first negative electrode active material layer 2222 and the first solid electrolyte layer 223, to form a first support portion 2241.

[0145] A support material with the same thickness as the positive electrode sheet 221 is filled into the side of the first support portion 2241 opposite to the negative electrode current collector layer to form the second support portion 2242.

[0146] Therefore, when the support member 224 is composed of the first support part 2241 and the second support part 2242, the two support parts can be processed in steps to improve the processing accuracy.

[0147] According to some embodiments of this application, referring to Figures 2, 4 to 9, this application provides a battery 100, whose casing 10 includes a plurality of battery cells 20 arranged in a row and column. Each battery cell 20 includes a housing 21 and an electrode assembly 22 disposed within the housing 21. The electrode assembly 22 includes a positive electrode 221, a negative electrode 222, a first solid electrolyte layer 223, a support member 224, and a second solid electrolyte layer 225. The positive electrode 221 and the negative electrode 222 are stacked along a first direction.

[0148] The positive electrode 221 includes a first positive electrode active material layer 2211, a positive electrode current collector 2212, and a second positive electrode active material layer 2213. The first positive electrode active material layer 2211 and the second positive electrode active material layer 2213 are respectively coated on opposite sides of the positive electrode current collector 2212 along a first direction, and the outer edges of the first positive electrode active material layer 2211 and the second positive electrode active material layer 2213 are flush with the outer edge of the positive electrode current collector 2212.

[0149] The negative electrode 222 includes a negative current collector 2221, a first negative active material layer 2222, and a second negative active material layer 2223. The first surface a of the negative current collector 2221 includes a coating area a1 and an empty foil area a2. The coating area a1 is provided with the first negative active material layer 2222. Along the first direction, the projected area of ​​the first negative active material layer 2222 on the negative current collector 2221 is larger than the projected area of ​​the positive electrode 221 on the negative current collector 2221. The empty foil area a2 is provided with a support member 224, and the support member 224 is located on the outer periphery of the first negative active material layer 2222, the first solid electrolyte layer 223, and the positive electrode 221. The second negative active material layer 2223 is coated on the second surface b of the negative current collector 2221, and the outer edge of the second negative active material layer 2223 is flush with the outer edge of the negative current collector 2221.

[0150] A first solid electrolyte layer 223 is disposed between the positive electrode 221 and the first negative electrode active material layer 2222, with the outer edge of the first solid electrolyte layer 223 flush with the outer edge of the first negative electrode active material layer 2222. A second solid electrolyte layer 225 is disposed on the side of the second negative electrode active material layer 2223 facing away from the negative electrode current collector 2221, with the outer edge of the second solid electrolyte layer 225 flush with the outer edge of the second negative electrode active material layer 2223.

[0151] 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. 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, include: shell; as well as An electrode assembly is disposed within the housing. The electrode assembly includes a positive electrode, a negative electrode, and a first solid electrolyte layer. The positive electrode and the negative electrode are stacked along a first direction. The negative electrode includes a negative current collector and a first negative active material layer. The negative current collector has a first surface along the first direction. The first surface includes a coated area and an empty foil area. The coated area is provided with the first negative active material layer, and the empty foil area is not provided with the first negative active material layer. The empty foil area is located on the outer periphery of the coated area. The positive electrode is located on the side of the first negative active material layer facing away from the negative current collector. A first solid electrolyte layer is disposed between the positive electrode and the first negative active material layer. Along the first direction, the projected area of ​​the first negative active material layer on the negative current collector is larger than the projected area of ​​the positive electrode on the negative current collector. The electrode assembly further includes a support member made of insulating material. The support member is disposed in the empty foil area and is located on the outer periphery of the first negative electrode active material layer, the first solid electrolyte layer and the positive electrode sheet.

2. The battery cell of claim 1, wherein, The support includes a first support portion and a second support portion. The first support portion is connected between the empty foil area and the second support portion. The first support portion is arranged around the outer periphery of the first negative electrode active material layer and the first solid electrolyte layer. The second support portion is arranged around the outer periphery of the positive electrode sheet.

3. The battery cell of claim 2, wherein, Along the first direction, the thickness of the first support portion is the same as the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer, and the thickness of the second support portion is the same as the thickness of the positive electrode sheet.

4. The battery cell according to claim 2 or 3, characterized in that, The outer edges of the first support portion and the second support portion are flush with the outer edge of the negative electrode current collector.

5. The battery cell of claim 4, wherein, Along the second direction, the width of the first support is smaller than the width of the second support; along the third direction, the width of the first support is smaller than the width of the second support; the first direction, the second direction, and the third direction are perpendicular to each other.

6. The battery cell of any one of claims 1-5, wherein, The negative electrode current collector also has a second surface opposite to the first surface along the first direction; The negative electrode sheet further includes a second negative electrode active material layer, which is disposed on the second surface, and the outer edge of the second negative electrode active material layer is flush with the outer edge of the negative electrode current collector.

7. The battery cell of claim 6, wherein, The electrode assembly further includes a second solid electrolyte layer, which is disposed on the side of the second negative electrode active material layer facing away from the negative electrode current collector, and the outer edge of the second solid electrolyte layer is flush with the outer edge of the second negative electrode active material layer.

8. The battery cell of any one of claims 1-7, wherein, The positive electrode sheet includes a first positive electrode active material layer, a positive electrode current collector, and a second positive electrode active material layer stacked along the first direction. The first positive electrode active material layer and the second positive electrode active material layer are respectively coated on opposite sides of the positive electrode current collector along the first direction. Along the first direction, the projected area of ​​the first negative electrode active material layer on the negative electrode current collector is larger than the projected area of ​​the positive electrode current collector on the negative electrode current collector; The outer edges of the first positive electrode active material layer and the second positive electrode active material layer are both flush with the outer edge of the positive electrode current collector.

9. The battery cell of any one of claims 1-8, wherein, The support component is made of UV insulating adhesive.

10. A battery, characterized by Includes the battery cell as described in any one of claims 1-9.

11. An electrical device, characterized by It includes the battery cell as described in any one of claims 1-9, or the battery as described in claim 10.

12. A battery manufacturing apparatus, characterized by comprising: An electrode assembly suitable for manufacturing a battery cell as described in any one of claims 1-9, the battery manufacturing equipment includes a feeding device, a cleaning device, a filling device, and a cutting device, the feeding device being used to provide a substrate, the substrate including a negative electrode current collector layer, a first negative electrode active material layer coated on a first surface of the negative electrode current collector layer, and a first solid electrolyte layer coated on the first negative electrode active material layer. The cleaning device is used to clean the substrate to remove part of the first solid electrolyte layer and part of the first negative electrode active material layer. Multiple coating areas with the first negative electrode active material layer and empty foil areas without the first negative electrode active material layer are formed on the negative electrode current collector layer. The multiple coating areas are spaced apart from each other along the length direction of the substrate, and an empty foil area is arranged around the outer periphery of each coating area. The filling device is used to fill each of the empty foil areas with support material to form a support member; The cutting device is used to cut the position between two adjacent coating areas after the support is formed, so as to form the negative electrode sheet with the support.

13. The battery manufacturing apparatus according to claim 12, characterized by The support member includes a first support portion and a second support portion; The filling device includes a first filling mechanism and a second filling mechanism; The first filling mechanism is used to fill each of the empty foil areas with a support material whose thickness is the same as the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer, so as to form the first support portion; The second filling mechanism is used to fill the side of the first support portion opposite to the negative electrode current collector layer with a support material of the same thickness as the positive electrode sheet to form the second support portion.

14. A method of manufacturing a battery, characterized by, The method of manufacturing a battery cell suitable for producing an electrode assembly as described in any one of claims 1-9, wherein the battery manufacturing method comprises: A substrate is provided; wherein the substrate includes at least a negative electrode current collector layer, a first negative electrode active material layer coated on a first surface of the negative electrode current collector layer, and a first solid electrolyte layer coated on the first negative electrode active material layer; The substrate is cleaned to remove part of the first solid electrolyte layer and part of the first negative electrode active material layer. Multiple coating areas with the first negative electrode active material layer and empty foil areas without the first negative electrode active material layer are formed on the negative electrode current collector layer. The multiple coating areas are spaced apart from each other along the length direction of the substrate, and an empty foil area is arranged around the outer periphery of each coating area. Fill each of the empty foil areas with support material to form a support member; After the support is formed, the position between two adjacent coating areas is cut to form the negative electrode sheet with the support. The positive electrode is stacked within the stacked space formed by the support and the negative electrode to form an electrode assembly.

15. The method of claim 14, wherein The support member includes a first support portion and a second support portion; The step of filling each of the empty foil areas with support material to form a support includes: Each of the empty foil regions is filled with a support material whose thickness is the same as the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer, to form the first support portion; A support material with a thickness consistent with that of the positive electrode sheet is filled into the side of the first support portion opposite to the negative electrode current collector layer to form the second support portion.

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