Battery cell, battery, electric equipment, and battery manufacturing equipment and method

Abstract

The embodiment of the invention provides a battery monomer, a battery, electric equipment, and battery manufacturing equipment and method, and belongs to the technical field of batteries. The battery monomer comprises a shell and an electrode assembly arranged in the shell, the electrode assembly comprises a positive pole piece, a negative pole piece and a first solid electrolyte layer, and the positive pole piece and the negative pole piece are laminated along a first direction; a first negative electrode active material layer is arranged in a coating area of a negative electrode current collector of the negative electrode plate; the first solid electrolyte layer is arranged between the positive pole piece and the first negative active material layer; in the first direction, the projection area of the first negative electrode active material layer on the negative electrode current collector is larger than that of the positive electrode piece on the negative electrode current collector; and the electrode assembly further comprises a supporting piece made of an insulating material, and the supporting piece is arranged in an empty foil area of the negative electrode current collector and is positioned on the peripheries of the first negative electrode active material layer, the first solid electrolyte layer and the positive electrode plate, so that the part, protruding out of the positive electrode plate, of the negative electrode plate is supported, and the reliability of the single battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, an electrical device, a battery manufacturing device and a method. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In battery technology, the reliability of battery cells is an issue that cannot be ignored. Therefore, how to improve the reliability of battery cells is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] In view of the above problems, the present application provides a battery cell, a battery, an electrical device, a battery manufacturing device and a method for supporting the portion of the negative electrode plate protruding from the positive electrode plate, thereby improving the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising: housing; and an electrode assembly disposed in the housing, the electrode assembly comprising a positive electrode sheet, a negative electrode sheet, and a first solid electrolyte layer, the positive electrode sheet and the negative electrode sheet being stacked along a first direction; The negative electrode plate includes a negative electrode current collector and a first negative electrode active material layer. The negative electrode current collector has a first surface along the first direction, the first surface including a coated area and a hollow foil area. The coated area is provided with the first negative electrode active material layer, and the hollow foil area is not provided with the first negative electrode active material layer. The hollow foil area is provided on the periphery of the coated area. The positive electrode plate 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 provided between the positive electrode plate 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 plate on the negative electrode current collector. Wherein, the electrode assembly further includes a support member, which is made of insulating material and is arranged in the empty foil area. The support member is located at the periphery of the first negative electrode active material layer, the first solid electrolyte layer and the positive electrode plate.

[0006] In the technical solution of the embodiments of this application, a support member is provided in the hollow foil area of ​​the negative electrode current collector. This support member can be located at the 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 the portion of the negative electrode sheet protruding from the positive electrode sheet under pressure, thereby improving the reliability of the battery cell. In addition, a relatively stable connection can be established between the hollow foil area of ​​the negative electrode current collector and the support member, further improving the reliability of the battery cell.

[0007] In some embodiments, the support member 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 periphery of the first negative electrode active material layer and the first solid electrolyte layer, and the second support portion is arranged around the periphery of the positive electrode sheet.

[0008] The support member consists of a first support portion and a second support portion. The first support portion wraps 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 accommodation space for the first negative electrode active material layer and the first solid electrolyte layer. The second support portion wraps around the positive electrode sheet along the circumference of the electrode assembly, while providing a relatively stable accommodation space for the positive electrode sheet.

[0009] In some embodiments, along the first direction, the thickness of the first supporting portion is 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 supporting portion is consistent with the thickness of the positive electrode sheet.

[0010] By ensuring that the thickness of the first support portion is consistent with the sum of the thicknesses of the first negative electrode active material layer and the first solid electrolyte layer, and that the thickness of the second support portion is 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.

[0011] In some embodiments, an outer edge of the first supporting portion and an outer edge of the second supporting portion are flush with an outer edge of the negative electrode current collector.

[0012] By making the outer edges of the first supporting portion and the second supporting portion flush with the outer edge of the negative electrode current collector, a relatively flat outer wall of the electrode assembly is formed.

[0013] 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.

[0014] By making the width of the first support portion along the second direction and the third direction smaller than the width of the second support portion, the width of the first negative electrode active material layer along the second direction and the third direction can be made larger than the width of the second support portion, thereby making the projected area of ​​the first negative electrode active material layer on the negative electrode current collector 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.

[0015] In some embodiments, the negative electrode current collector further has a second surface opposite to the first surface along the first direction; The negative electrode plate further includes a second negative electrode active material layer, which is disposed on the second surface. The outer edge of the second negative electrode active material layer is flush with the outer edge of the negative electrode current collector.

[0016] At this time, negative electrode active material layers will be provided on both side surfaces of the negative electrode 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 collector, the area of ​​the second negative electrode active material layer can be made consistent with the area of ​​the negative electrode collector, reducing the possibility of a protruding edge forming between the negative electrode collector and the second negative electrode active material layer due to inconsistent areas.

[0017] In some embodiments, 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.

[0018] By disposing 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 assemblies when the electrode assemblies are stacked can be reduced. Furthermore, because 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 and the area of ​​the second negative electrode active material layer are consistent, reducing the possibility of a protruding edge between the second solid electrolyte layer and the second negative electrode active material layer due to the area discrepancy.

[0019] In some embodiments, 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, and 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, a projected area of ​​the first negative electrode active material layer on the negative electrode current collector is larger than a projected area of ​​the positive electrode current collector on the negative electrode current collector; The outer edge of the first positive electrode active material layer and the outer edge of the second positive electrode active material layer are both flush with the outer edge of the positive electrode current collector.

[0020] At this time, the positive electrode sheet is composed of a positive electrode collector and a positive electrode active material layer arranged on the two side surfaces of the positive electrode collector along a first direction. By making the projected area of ​​the first negative electrode active material layer on the negative electrode collector larger than the projected area of ​​the positive electrode collector on the negative electrode collector, and making the outer edge of the first positive electrode active material layer and the outer edge of the second positive electrode active material layer flush with the outer edge of the positive electrode collector, so that the projected area of ​​the first negative electrode active material layer on the negative electrode collector can be larger than the projected area of ​​the positive electrode sheet on the negative electrode collector, the occurrence of lithium plating during battery charging is reduced.

[0021] In some embodiments, the support member is UV insulating glue.

[0022] The support is made of UV insulating glue to achieve the insulation and supporting function of the support.

[0023] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0024] The battery provided in the present application includes the battery cell described in any one of the embodiments of the first aspect, and thus has the technical effects described in any one of the above embodiments, which will not be described in detail here.

[0025] In a third aspect, the present application provides an electrical device comprising the battery in the above embodiment.

[0026] The electrical equipment provided in the present application includes the battery described in any one of the embodiments of the first aspect, and thus has the technical effects described in any one of the above embodiments, which will not be described in detail here.

[0027] In a fourth aspect, the present application provides a battery manufacturing apparatus suitable for manufacturing the electrode assembly of the battery cell in the above-mentioned embodiment, the battery manufacturing apparatus comprising a feeding device, a cleaning device, a filling device, and a cutting device, the feeding device being used to provide a substrate, the substrate comprising 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 a portion of the first solid electrolyte layer and a portion of the first negative electrode active material layer, and form a plurality of coating areas provided with the first negative electrode active material layer and a hollow foil area not provided with the first negative electrode active material layer on the negative electrode current collector layer, wherein the plurality of coating areas are spaced apart from each other along the length direction of the substrate, and each of the coating areas is surrounded by a hollow foil area; The filling device is used to fill the supporting material into each of the empty foil areas to form a supporting member; The cutting device is used to cut the position between two adjacent coating areas after the support member is formed, so as to form the negative electrode sheet provided with the support member.

[0028] In the technical solution of the embodiment of the present application, when manufacturing 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, and then the empty foil area is filled with a supporting material by a filling device to form a support member. After the support member is formed, the position between two adjacent coating areas is cut by a cutting device to form a negative electrode pole piece provided with a support member. A stacking space suitable for stacking positive electrode pole pieces will be enclosed between the negative electrode pole piece and the support member. The electrode assembly manufactured by this battery manufacturing equipment can establish a relatively stable connection between the empty foil area and the support member, and can also support the portion of the negative electrode pole piece protruding from the positive electrode pole piece, thereby reducing the possibility of the portion of the negative electrode pole piece protruding from the positive electrode pole piece being bent or broken under pressure, thereby improving the reliability of the battery cell.

[0029] 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 supporting material having a thickness 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 supporting portion; The second filling mechanism is used to fill a support material having a thickness consistent with that of the positive electrode sheet into the side of the first support portion facing away from the negative electrode current collector layer, so as to form the second support portion.

[0030] Therefore, when the support member is composed of a first support portion and a second support portion, the two support portions can be processed step by step by the first filling mechanism and the second filling mechanism respectively.

[0031] In a fifth aspect, the present application provides a battery manufacturing method, which is suitable for manufacturing the electrode assembly of the battery cell in the above embodiment, and the battery manufacturing method comprises: Providing a substrate; wherein the substrate at least 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; Cleaning the substrate to remove a portion of the first solid electrolyte layer and a portion of the first negative electrode active material layer, and forming a plurality of coating areas provided with the first negative electrode active material layer and a hollow foil area not provided with the first negative electrode active material layer on the negative electrode current collector layer, wherein the plurality of coating areas are spaced apart from each other along the length direction of the substrate, and each coating area is surrounded by a hollow foil area; filling each of the empty foil areas with a support material to form a support member; After the support member is formed, cutting the area between two adjacent coating areas to form the negative electrode sheet provided with the support member; The positive electrode sheet is stacked in the stacking space surrounded by the support member and the negative electrode sheet to form an electrode assembly.

[0032] In the technical solution of the embodiment of the present application, when manufacturing 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 a supporting material to form a support member. After the support member is formed, the position between two adjacent coating areas is cut to form a negative electrode plate provided with a support member. A stacking space suitable for stacking positive electrode plates will be enclosed between the negative electrode plate and the support member, so that the positive electrode plate and the negative electrode plate 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 member, and can also support the portion of the negative electrode plate protruding from the positive electrode plate, thereby reducing the possibility of the portion of the negative electrode plate protruding from the positive electrode plate being bent or broken under pressure, thereby improving the reliability of the battery cell.

[0033] In some embodiments, the support member includes a first support portion and a second support portion; The step of filling each of the empty foil areas with a supporting material to form a supporting member comprises: Filling each of the empty foil areas with a support material having a thickness 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; A support material having a thickness consistent with the thickness of the positive electrode sheet is filled into the side of the first support portion facing away from the negative electrode current collector layer to form the second support portion.

[0034] Therefore, when the support member is composed of the first support portion and the second support portion, the two support portions can be processed in steps.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic structural diagram of a vehicle in some embodiments of the present application; Figure 2 Schematic diagram of the exploded structure of the battery in some embodiments of the present application; Figure 3 Schematic diagram of the exploded structure of a battery cell in some embodiments of the present application; Figure 4 Schematic diagram of the structure of the electrode assembly in the battery cell in some embodiments of the present application; Figure 5 Schematic diagram of the structure of the positive electrode sheet in a battery cell in some embodiments of the present application; Figure 6 Schematic diagram of the assembly of the negative electrode sheet, the first solid electrolyte layer, and the second solid electrolyte layer in a battery cell in some embodiments of the present application; Figure 7 for Figure 6 A schematic diagram from another angle; Figure 8 Schematic diagram of the assembly of the negative electrode sheet, the first solid electrolyte layer, the second solid electrolyte layer, and the support member in a battery cell in some embodiments of the present application; Figure 9 Schematic diagram of the stacking of electrode assemblies in a battery cell in some embodiments of the present application; Figure 10 This is a schematic structural diagram of a battery manufacturing device in some embodiments of the present application; Figure 11 Schematic diagram of the process of manufacturing a battery in some embodiments of the present application.

[0037] The accompanying drawings in the specific implementation manner are as follows: 1000. Vehicle; 100, battery; 200, controller; 300, motor; 10. Box body; 11. First part; 12. Second part; 20. Battery cell; 21. Housing; 211. End cap; 212. Housing; 22. Electrode assembly; 221. Positive electrode sheet; 2211. First positive electrode active material layer; 2212. Positive electrode current collector; 2213. Second positive electrode active material layer; 222. Negative electrode sheet; 2221. Negative electrode current collector; a. First surface; a1. Coating area; a2. Empty foil area; b. Second surface; 2222. First negative electrode active material layer; 2223. Second negative electrode active material layer; 223. First solid electrolyte layer; 224. Support member; 2241. First support portion; 2242. Second support portion; 225. Second solid electrolyte layer; 23. 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; DETAILED DESCRIPTION The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0044] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0045] The inventors have noted that in electrode assemblies, the negative electrode sheet is typically larger than the positive electrode sheet in at least one of its length and width directions. Because the protruding area of ​​the negative electrode sheet has relatively weak overall structural strength, the protruding area can bend under the pressure during warm isostatic pressing of the electrode assembly. This bending can cause fractures at the junction of the protruding area and the normally compressed area, and burrs generated by these fractured edges can puncture the separator. Furthermore, the protruding area can cause overlap between the positive and negative electrode sheets, resulting in a short circuit between the positive and negative electrode sheets, posing a significant safety hazard to the battery.

[0046] In order to reduce the above safety hazards, the applicant has found that insulating supports can be provided on both sides of the protruding area along the thickness direction of the negative electrode sheet to cope with the pressure during warm isostatic pressing through the insulating supports.

[0047] However, to simplify the lamination process, conventional techniques typically apply a separator directly to both sides of the negative electrode sheet during manufacturing. This creates a composite assembly, which is then laminated with the positive electrode sheet to form the electrode assembly. However, separators have weak adhesion, and if insulating supports are attached directly to the separators, there is a significant risk of them slipping off, posing a significant safety hazard to the battery.

[0048] Based on the above considerations, and to address the significant safety risks posed by batteries, a battery cell has been designed. A support member is provided in the hollow foil area of ​​the negative electrode current collector. This support member can be positioned around the periphery of the first negative electrode active material layer, the first solid electrolyte layer, and the positive electrode tab. This supports the portion of the negative electrode tab that protrudes from the positive electrode tab, reducing the likelihood of bending or breaking under pressure in the protruding portion of the negative electrode tab, thereby improving the reliability of the battery cell. Furthermore, a relatively stable connection is established between the hollow foil area of ​​the negative electrode current collector and the support member, further enhancing the reliability of the battery cell.

[0049] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. The power supply system of the electrical equipment can be composed of the battery disclosed in the present application.

[0050] The technical solutions described in the embodiments of this application are applicable to various battery-powered electrical devices, such as mobile phones, tablets, laptop computers, electric toys, power tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0051] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0052] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of vehicle 1000 provided for some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside vehicle 1000. Battery 100 can be provided at the bottom, head or tail of vehicle 1000. Battery 100 can be used to power vehicle 1000. For example, battery 100 can be used as an operating power source for vehicle 1000. Alternatively, it can be used in the circuit system of vehicle 1000, such as for the working power requirements of vehicle 1000 during startup, navigation and operation.

[0053] The vehicle 1000 may further 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, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0054] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0055] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, wherein the battery cell 20 is accommodated in the housing 10. The housing 10 is used to provide a space for accommodating the battery cell 20, and the housing 10 can adopt various structures.

[0056] In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which cover each other and together define a storage space for accommodating the battery cells 20. The second portion 12 may be a hollow structure with one end open, 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 a storage space. The first portion 11 and the second portion 12 may also be hollow structures with one end open, 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 have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0057] In the battery 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 10. The battery 100 can also include other structures. For example, the battery 100 can also include a confluence component (such as Figure 5 The first busbar 40 and the second busbar 50 shown in FIG are used to realize electrical connection between the plurality of battery cells 20 .

[0058] Each battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0059] Please refer to Figure 3 , Figure 3 The following is a schematic diagram of the decomposition structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. Figure 3The battery cell 20 includes a housing 21, an electrode assembly 22 and other functional components.

[0060] The housing 21 includes an end cap 211 and a shell 212. The end cap 211 covers the opening of the shell 212 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212.

[0061] Optionally, the end cap 211 can be made of a material with a certain degree of hardness and strength (such as aluminum alloy). This makes the end cap 211 less susceptible to deformation when subjected to compression or collision, providing the battery cell 20 with greater structural strength and improved safety. Functional components such as the terminal post 23 can be provided on the end cap 211. The terminal post 23 can be used to electrically connect to the electrode assembly 22 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 211 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, although this is not particularly limited in this embodiment of the present application. In some embodiments, an insulating member can be provided inside the end cap 211 to isolate the electrical connection components within the housing 212 from the end cap 211, thereby reducing the risk of short circuits. Exemplary insulating members can be made of plastic, rubber, or the like.

[0062] The housing 212 is a component that cooperates with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The housing 212 and end cap 211 can be separate components. An opening can be provided in the housing 212, and the end cap 211 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 211 and housing 212 can be integrated. Specifically, the end cap 211 and housing 212 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 212 is to be enclosed, the end cap 211 is placed over the housing 212. The housing 212 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 212 can be determined based on the specific shape and size of the electrode assembly 22. The housing 212 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this embodiment of the present application does not impose any particular limitations on this.

[0063] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 212. The electrode assembly 22 is mainly formed by stacking negative electrode sheets and positive electrode sheets, and a separator is usually provided between the negative electrode sheets and the positive electrode sheets. The parts of the negative electrode sheets and the positive electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the negative electrode sheets and the positive electrode sheets without active materials each constitute a tab. The negative electrode tab and the positive electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the negative electrode active material and the positive electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0064] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figures 4 to 9 , Figure 4 is a schematic structural diagram of an electrode assembly in a battery cell according to some embodiments of the present application. Figure 5 Schematic diagram of the structure of the positive electrode sheet in a battery cell according to some embodiments of the present application. Figure 6 and Figure 7 According to the assembly diagram of the negative electrode sheet, the first solid electrolyte layer and the second solid electrolyte layer in the battery cell in some embodiments of the present application, Figure 8 According to the assembly diagram of the negative electrode sheet, the first solid electrolyte layer, the second solid electrolyte layer and the support member in the battery cell in some embodiments of the present application, Figure 9 According to a schematic diagram of the stacking of electrode assemblies in a battery cell in some embodiments of the present application, the present application provides a battery cell 20, comprising a housing 21 and an electrode assembly 22. The electrode assembly 22 is disposed within the housing 21 and comprises a positive electrode sheet 221, a negative electrode sheet 222, and a first solid electrolyte layer 223. The positive electrode sheet 221 and the negative electrode sheet 222 are stacked along a first direction.

[0065] The negative electrode sheet 222 includes a negative electrode current collector 2221 and a first negative electrode active material layer 2222. The negative electrode current collector 2221 has a first surface a along a first direction. The first surface a includes a coated area a1 and a bare foil area a2. The coated area a1 is provided with the first negative electrode active material layer 2222, while the bare foil area a2 is not provided with the first negative electrode active material layer 2222. The bare foil area a2 is disposed on the periphery of the coated area a1. The positive electrode sheet 221 is located on the side of the first negative electrode active material layer 2222 facing away from the negative electrode current collector 2221. The first solid electrolyte layer 223 is disposed between the positive electrode sheet 221 and the first negative electrode active material layer 2222. Along the first direction, the projected area of ​​the first negative electrode active material layer 2222 on the negative electrode current collector 2221 is larger than the projected area of ​​the positive electrode sheet 221 on the negative electrode current collector 2221.

[0066] The electrode assembly 22 further includes a support member 224 . The support member 224 is made of insulating material and is disposed in the empty foil area a2 . The support member 224 is located around the first negative active material layer 2222 , the first solid electrolyte layer 223 and the positive electrode sheet 221 .

[0067] The first solid electrolyte layer 223 uses a solid electrolyte as an insulator. The solid electrolyte is arranged between the positive electrode and the negative electrode, and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0068] The negative electrode current collector 2221 can be a metal foil or a composite current collector. For example, the metal foil can be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0069] The negative electrode active material selected for the first negative electrode active material layer 2222 can be a negative electrode active material for batteries that is well known in the art. 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. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0070] In the technical solution of the embodiment of the present application, a support member 224 is provided in the hollow foil area a2 of the negative electrode current collector 2221. The support member 224 can be located at the 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 protruding from the positive electrode sheet 221, reducing the possibility of the portion of the negative electrode sheet 222 protruding from the positive electrode sheet 221 being bent or broken under pressure, thereby improving the reliability of the battery cell 20. In addition, a relatively stable connection can be established between the hollow foil area a2 of the negative electrode current collector 2221 and the support member 224, further improving the reliability of the battery cell 20.

[0071] According to some embodiments of this application, optionally, please continue to refer to Figure 4 and Figure 8 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 area a2 and the second support portion 2242. The first support portion 2241 is arranged around the periphery of the first negative electrode active material layer 2222 and the first solid electrolyte layer 223. The second support portion 2242 is arranged around the periphery of the positive electrode sheet 221.

[0072] 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 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 accommodation space for the first negative electrode active material layer 2222 and the first solid electrolyte layer 223. The second support portion 2242 can wrap the positive electrode sheet 221 along the circumference of the electrode assembly 22, while providing a relatively stable accommodation space for the positive electrode sheet 221.

[0073] According to some embodiments of this application, optionally, please continue to refer to Figure 4 and Figure 8 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 .

[0074] By ensuring that 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, scratches between the first support portion 2241 and the positive electrode sheet 221 and between the second support portion 2242 and the first solid electrolyte layer 223 can be avoided.

[0075] According to some embodiments of this application, optionally, please continue to refer to Figure 4 and Figure 8 The outer edge of the first support portion 2241 and the outer edge of the second support portion 2242 are both flush with the outer edge of the negative electrode current collector 2221 .

[0076] 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 evenly connected to the outer peripheral surface of the negative electrode current collector 2221 to form a relatively flat outer wall of the electrode assembly 22.

[0077] According to some embodiments of this application, optionally, please continue to refer 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.

[0078] 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 .

[0079] By making the width of the first support portion 2241 along the second direction and the third direction smaller than the width of the second support portion 2242, the width of the first negative electrode active material layer 2222 along the second direction and the third direction can be made larger than the width of the second support portion 2242, thereby making the projected area of ​​the first negative electrode active material layer 2222 on the negative electrode current collector 2221 larger 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.

[0080] According to some embodiments of this application, optionally, please continue to refer to Figure 4 and Figure 8 The negative electrode current collector 2221 further has a second surface b opposite to the first surface a along the first direction.

[0081] The negative electrode sheet 222 further includes a second negative electrode active material layer 2223 . The second negative electrode active material layer 2223 is disposed on the second surface b. 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 .

[0082] The negative electrode active material selected for the second negative electrode active material layer 2223 can be a negative electrode active material for batteries that is well known in the art. 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. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0083] At this time, negative electrode active material layers will be provided on both side surfaces of the negative electrode 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 collector 2221, the area of ​​the second negative electrode active material layer 2223 can be made consistent with the area of ​​the negative electrode collector 2221, reducing the possibility of a protruding edge forming between the negative electrode collector 2221 and the second negative electrode active material layer 2223 due to inconsistent areas.

[0084] 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 .

[0085] The second solid electrolyte layer 225 uses a solid electrolyte as an insulator. 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 simultaneously plays the role of transmitting ions and isolating the positive and negative electrodes.

[0086] By disposing the 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 a short circuit between two adjacent electrode assemblies 22 can be reduced when the electrode assemblies 22 are stacked. In addition, because 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 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 the inconsistent area.

[0087] According to some embodiments of this application, optionally, please continue to refer to Figures 4 to 9 The positive electrode sheet 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 coated on opposite sides of the positive electrode current collector 2212 along the first direction. The 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.

[0088] 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 current collector 2212 on the negative current collector 2221 .

[0089] The outer edges of the first positive electrode active material layer 2211 and the second positive electrode active material layer 2213 are both flush with the outer edge of the positive electrode current collector 2212 .

[0090] As an example, the positive electrode current collector 2212 can be a metal foil or a composite current collector. For example, the metal foil can be made of silver-plated stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. The composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0091] 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-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, this application is not limited to these materials; other conventional materials that can be used as battery positive electrode active materials may also be used.

[0092] At this time, the positive electrode sheet 221 is composed of a positive electrode collector 2212 and a positive electrode active material layer arranged on the two side surfaces of the positive electrode collector 2212 along the first direction. By making the projected area of ​​the first negative electrode active material layer 2222 on the negative electrode collector 2221 larger than the projected area of ​​the positive electrode collector 2212 on the negative electrode collector 2221, and making the outer edge of the first positive electrode active material layer 2211 and the outer edge of the second positive electrode active material layer 2213 both flush with the outer edge of the positive electrode collector 2212, so that the projected area of ​​the first negative electrode active material layer 2222 on the negative electrode collector 2221 can be larger than the projected area of ​​the positive electrode sheet 221 on the negative electrode collector 2221, the occurrence of lithium plating during battery charging is reduced.

[0093] According to some embodiments of this application, optionally, please continue to refer to Figures 4 to 9 The support member 224 is UV (Ultraviolet Rays) insulating adhesive, that is, UV curing adhesive.

[0094] The support member 224 is made of UV insulating adhesive to achieve the insulation and support functions of the support member 224 .

[0095] According to some embodiments of the present application, the present application provides a battery 100. The battery 100 includes a battery cell 20 according to any of the above solutions.

[0096] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery according to any of the above solutions, and the battery is used to provide electrical energy to the electrical device.

[0097] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0098] According to some embodiments of this application, please refer to Figure 10 The present application provides a battery manufacturing device 2000, which is suitable for manufacturing the electrode assembly 22 of the battery cell 20 in any of the above schemes. The battery manufacturing device 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 the 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.

[0099] The feeding device 400 may include a reeling mechanism, a roller mechanism, and a deflection correction mechanism. The reeling mechanism is used to provide a wound substrate. The roller mechanism is used to convey the substrate after it is unfolded from the reeling mechanism. The deflection correction mechanism is used to adjust the conveying direction of the substrate to prevent the substrate from tilting.

[0100] 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, and form a plurality of coating areas a1 provided with the first negative electrode active material layer 2222 and empty foil areas a2 not provided with the first negative electrode active material layer 2222 on the negative electrode current collector layer. The plurality of coating areas a1 are spaced apart from each other along the length direction of the substrate, and an empty foil area a2 is provided around the periphery of each coating area a1.

[0101] The cleaning device 500 may be a laser cleaning device. Thus, when cleaning the substrate, laser cleaning is used to remove a portion of the first solid electrolyte layer 223 and a portion of the first negative electrode active material layer 2222 .

[0102] The filling device 600 is used to fill each empty foil area a2 with a supporting material to form a supporting member 224 .

[0103] The supporting material can be selected as UV insulating glue.

[0104] 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 the negative electrode sheet 222 provided with the support member 224 .

[0105] In the technical solution of the embodiment of the present application, when manufacturing the electrode assembly 22, the substrate is first cleaned by a cleaning device 500 to expose the empty foil area a2 of the negative current collector layer. The empty foil area a2 is then filled with a support material by a filling device 600 to form a support member 224. After the support member 224 is formed, the position between two adjacent coated areas a1 is cut by a cutting device 700 to form a negative electrode sheet 222 with a support member 224. The space between the negative electrode sheet 222 and the support member 224 is formed to form a stacking space suitable for stacking the positive electrode sheet 221. The electrode assembly 22 manufactured by the 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 portion of the negative electrode sheet 222 protruding from the positive electrode sheet 221, reducing the possibility of the portion of the negative electrode sheet 222 protruding from the positive electrode sheet 221 being bent or broken under pressure, thereby improving the reliability of the battery cell 20.

[0106] According to some embodiments of this application, optionally, please continue to refer to Figure 10 The support member 224 includes a first support portion 2241 and a second support portion 2242 .

[0107] The filling device 600 includes a first filling mechanism 601 and a second filling mechanism 602 .

[0108] The first filling mechanism 601 is used to fill each empty foil area a2 with a supporting material having a thickness consistent with 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 supporting portion 2241 .

[0109] The second filling mechanism 602 is used to fill a support material having a thickness consistent with that of the positive electrode sheet 221 into the side of the first support portion 2241 facing away from the negative electrode current collector layer, so as to form the second support portion 2242 .

[0110] When the supporting material is UV insulating glue, both the first filling mechanism 601 and the second filling mechanism 602 can be UV printing mechanisms.

[0111] Therefore, when the support member 224 is composed of the first support portion 2241 and the second support portion 2242 , the two support portions can be processed step by step by the first filling mechanism 601 and the second filling mechanism 602 respectively, so as to improve the processing accuracy.

[0112] According to some embodiments of this application, please refer to Figure 11 The present application provides a battery manufacturing method, which is suitable for manufacturing the electrode assembly 22 of the battery cell 20 in any of the above solutions. The battery manufacturing method includes: Step S1: providing a substrate, wherein the substrate at least comprises 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 .

[0113] 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, and form a plurality of coating areas a1 provided with the first negative electrode active material layer 2222 and empty foil areas a2 not provided with the first negative electrode active material layer 2222 on the negative electrode current collector layer. The plurality of coating areas a1 are spaced apart from each other along the length direction of the substrate, and an empty foil area a2 is provided around the periphery of each coating area a1.

[0114] Step S3 , filling each empty foil area a2 with a supporting material to form a supporting member 224 .

[0115] Step S4 : After the support member 224 is formed, the position between two adjacent coating areas a1 is cut to form the negative electrode sheet 222 provided with the support member 224 .

[0116] Step S5 : stacking the positive electrode sheet 221 in the stacking space enclosed by the support member 224 and the negative electrode sheet 222 to form the electrode assembly 22 .

[0117] In the technical solution of the embodiment of the present application, 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 a 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 plate 222 provided with a support member 224. A stacking space suitable for stacking the positive electrode plate 221 is formed between the negative electrode plate 222 and the support member 224, so that the positive electrode plate 221 and the negative electrode plate 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 portion of the negative electrode plate 222 protruding from the positive electrode plate 221, thereby reducing the possibility of the portion of the negative electrode plate 222 protruding from the positive electrode plate 221 being bent or broken under pressure, thereby improving the reliability of the battery cell 20.

[0118] 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 .

[0119] The step of filling each empty foil area a2 with a supporting material to form a supporting member 224 comprises: Each empty foil area a2 is filled with a supporting material having a thickness that is consistent with 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 supporting portion 2241 .

[0120] A support material having a thickness consistent with that of the positive electrode sheet 221 is filled on the side of the first support portion 2241 facing away from the negative electrode current collector layer to form a second support portion 2242 .

[0121] Therefore, when the support member 224 is composed of the first support portion 2241 and the second support portion 2242 , the two support portions can be processed in steps to improve the processing accuracy.

[0122] According to some embodiments of the present application, see Figure 2 、 Figures 4 to 9The present application provides a battery 100, wherein a housing 10 includes a plurality of battery cells 20 arranged in a matrix. The battery cells 20 include a housing 21 and an electrode assembly 22 disposed within the housing 21. The electrode assembly 22 includes a positive electrode sheet 221, a negative electrode sheet 222, a first solid electrolyte layer 223, a support member 224, and a second solid electrolyte layer 225. The positive electrode sheet 221 and the negative electrode sheet 222 are stacked along a first direction.

[0123] The positive electrode sheet 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 outer edges of the second positive electrode active material layer 2213 are both flush with the outer edge of the positive electrode current collector 2212.

[0124] The negative electrode sheet 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 coated area a1 and a hollow foil area a2. The first negative active material layer 2222 is provided in the coated area a1. 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 sheet 221 on the negative current collector 2221. The hollow foil area a2 is provided with a support member 224, which is located around the first negative active material layer 2222, the first solid electrolyte layer 223, and the positive electrode sheet 221. The second negative active material layer 2223 is applied to 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.

[0125] The first solid electrolyte layer 223 is disposed between the positive electrode sheet 221 and the first negative electrode active material layer 2222. The outer edge of the first solid electrolyte layer 223 is flush with the outer edge of the first negative electrode active material layer 2222. The 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. 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.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; as well as An electrode assembly is disposed in the housing, the electrode assembly comprising a positive electrode sheet, a negative electrode sheet and a first solid electrolyte layer, the positive electrode sheet and the negative electrode sheet are stacked along a first direction; The negative electrode plate comprises a negative electrode current collector and a first negative electrode active material layer, the negative electrode current collector has a first surface along the first direction, the first surface comprises a coating area and a hollow foil area, the coating area is provided with the first negative electrode active material layer, the hollow foil area is not provided with the first negative electrode active material layer, and the hollow foil area is provided at the periphery of the coating area; the positive electrode plate 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 provided between the positive electrode plate 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 plate on the negative electrode current collector; Wherein, the electrode assembly also includes a support member, which is made of insulating material. The support member is arranged in the empty foil area, and the support member is located at the periphery of the first negative electrode active material layer, the first solid electrolyte layer and the positive electrode plate.

2. The battery cell according to claim 1, characterized in that: The support member 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 periphery of the first negative electrode active material layer and the first solid electrolyte layer, and the second support portion is arranged around the periphery of the positive electrode plate.

3. The battery cell according to claim 2, characterized in that: Along the first direction, the thickness of the first supporting portion is 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 supporting portion is consistent with the thickness of the positive electrode sheet.

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

5. The battery cell according to claim 4, characterized in that: 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.

6. The battery cell according to claim 1, characterized in that: The negative electrode current collector also has a second surface opposite to the first surface along the first direction; The negative electrode plate further includes a second negative electrode active material layer, which is disposed on the second surface, and an outer edge of the second negative electrode active material layer is flush with an outer edge of the negative electrode collector.

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

8. The battery cell according to claim 1, characterized in that: The positive electrode sheet comprises 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, wherein 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, a projected area of ​​the first negative electrode active material layer on the negative electrode current collector is larger than a projected area of ​​the positive electrode current collector on the negative electrode current collector; The outer edge of the first positive electrode active material layer and the outer edge of the second positive electrode active material layer are both flush with the outer edge of the positive electrode current collector.

9. The battery cell according to claim 1, characterized in that: The supporting member is UV insulating glue.

10. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: The method comprises a battery cell as claimed in any one of claims 1 to 9, or a battery as claimed in claim 10.

12. A battery manufacturing device, characterized in that: Suitable for manufacturing an electrode assembly of a battery cell as described in any one of claims 1 to 9, the battery manufacturing equipment comprising a feeding device, a cleaning device, a filling device and a cutting device, the feeding device is used to provide a substrate, the substrate comprising 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, and form a plurality of coating areas provided with the first negative electrode active material layer and an empty foil area without the first negative electrode active material layer on the negative electrode current collector layer, wherein the plurality of coating areas are arranged at intervals along the length direction of the substrate, and an empty foil area is arranged around the periphery of each coating area; The filling device is used to fill the supporting material into each of the empty foil areas to form a supporting member; The cutting device is used to cut the position between two adjacent coating areas after the support member is formed, so as to form the negative electrode sheet provided with the support member.

13. The battery manufacturing equipment according to claim 12, characterized in that: The support member includes a first support portion and a second support portion; The filling device comprises 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 supporting material having a thickness consistent with the sum of the thickness of the first negative electrode active material layer and the first solid electrolyte layer to form the first supporting portion; The second filling mechanism is used to fill a support material having a thickness consistent with that of the positive electrode sheet into the side of the first support portion facing away from the negative electrode current collector layer, so as to form the second support portion.

14. A battery manufacturing method, characterized in that: Suitable for manufacturing an electrode assembly of a battery cell according to any one of claims 1 to 9, the battery manufacturing method comprising: Providing a substrate; wherein the substrate at least comprises 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, and a plurality of coating areas provided with the first negative electrode active material layer and an empty foil area without the first negative electrode active material layer are formed on the negative electrode current collector layer, wherein the plurality of coating areas are arranged at intervals along the length direction of the substrate, and an empty foil area is arranged around the periphery of each coating area; filling each of the empty foil areas with a support material to form a support member; After the support member is formed, cutting the position between two adjacent coating areas to form the negative electrode sheet provided with the support member; The positive electrode sheet is stacked in the stacking space surrounded by the support member and the negative electrode sheet to form an electrode assembly.

15. The battery manufacturing method according to claim 14, characterized in that: The support member includes a first support portion and a second support portion; The step of filling each of the empty foil areas with a supporting material to form a supporting member comprises: Filling each of the empty foil regions with a support material having a thickness consistent with the sum of the thickness of the first negative electrode active material layer and the first solid electrolyte layer to form the first support portion; A support material having a thickness consistent with the thickness of the positive electrode sheet is filled into a side of the first support portion facing away from the negative electrode current collector layer to form the second support portion.

Images