Battery cells, batteries, electrical equipment, and electrode coating equipment

Abstract

This application provides a battery cell, a battery, an electrical device, and an electrode coating device, belonging to the field of battery technology. The battery cell includes a casing and an electrode assembly disposed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a solid electrolyte layer. The positive and negative electrode are stacked along a first direction, and the solid electrolyte layer is disposed between the positive and negative electrode. The positive electrode includes a positive current collector and a positive active material layer. The positive current collector includes a coating area and a first empty foil area. The surface of the coating area is provided with the positive active material layer, and the surface of the first empty foil area is not provided with the positive active material layer. Along a second direction, the first empty foil area is disposed on at least one side of the coating area, and the second direction is perpendicular to the first direction. The positive electrode also includes a first insulating member that wraps around the first empty foil area to reduce the possibility of end-face short circuits caused by bending at the misalignment point when the positive and negative electrode stacks are misaligned, thereby improving the reliability of the battery cell.

Description

Technical Field

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

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

[0003] 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

[0004] In view of the above problems, this application provides a battery cell, a battery, an electrical device, and an electrode coating device for wrapping the empty foil area of ​​the positive electrode current collector, thereby improving the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising:

[0006] The outer casing; and

[0007] An electrode assembly is disposed within the housing. The electrode assembly has a stacked structure and includes a positive electrode, a negative electrode, and a solid electrolyte layer. The positive electrode and the negative electrode are stacked along a first direction, and the solid electrolyte layer is disposed between the positive electrode and the negative electrode.

[0008] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive current collector includes a coating area and a first empty foil area. The surface of the coating area is provided with the positive active material layer, and the surface of the first empty foil area is not provided with the positive active material layer. Along a second direction, the first empty foil area is located on at least one side of the coating area. The second direction is perpendicular to the first direction.

[0009] The positive electrode sheet further includes a first insulating element, which wraps around the first empty foil area.

[0010] The positive electrode current collector has a first surface and a second surface disposed opposite to each other along the first direction, the positive electrode active material layer is disposed on the first surface and the second surface, and the positive electrode current collector has a first side surface in the second direction, the first side surface being connected to the first surface and the second surface;

[0011] The first insulating member includes a first insulating portion, a second insulating portion, and a third insulating portion. The first insulating portion is disposed on the first surface, the second insulating portion is disposed on the second surface, and the third insulating portion is disposed on the first side surface. The third insulating portion connects the first insulating portion and the second insulating portion.

[0012] In the technical solution of this application embodiment, the positive electrode current collector has a first surface and a second surface in a first direction, and a first side surface connecting the first surface and the second surface in a second direction. The edge connecting the first surface and the first side surface, the edge connecting the second surface and the first side surface, and the first side surface together constitute a first empty foil area of ​​the positive electrode current collector. By setting a first insulating member in the first empty foil area of ​​the positive electrode current collector, and having the three insulating parts of the first insulating member respectively disposed on each surface and side surface, the first insulating member can wrap the entire first empty foil area. This reduces the possibility of end face overlap short circuit caused by bending at the misalignment point during isostatic pressing after the positive electrode and negative electrode are stacked and misaligned, improves the reliability of the battery cell, and also reduces the design size of the first insulating member, thereby increasing the energy density of the cell.

[0013] In some embodiments, the thickness of the first insulating portion, the thickness of the second insulating portion, and the thickness of the positive electrode active material layer are equal.

[0014] Since the positive electrode active material layer is disposed on the first surface and the second surface, by making the thickness of the first insulating part, the thickness of the second insulating part and the thickness of the positive electrode active material layer equal, the possibility of difficulty in stacking due to the first insulating part and the second insulating part protruding from the positive electrode active material layer can be reduced, and the possibility of gaps between the insulating part and the solid electrolyte layer due to the first insulating part and the second insulating part being recessed into the positive electrode active material layer can also be reduced.

[0015] In some embodiments, along the second direction, the width of the positive electrode active material layer is smaller than the width of the positive electrode current collector, and the widths of the first insulating portion and the second insulating portion are both greater than the width of the third insulating portion.

[0016] The first insulating element is C-shaped so that it can wrap around each side of the first empty foil area.

[0017] In some embodiments, along the second direction, the width of the first insulating portion is the same as the width of the second insulating portion.

[0018] The first insulating portion and the second insulating portion are symmetrically arranged about the positive current collector along the first direction to form a corresponding first insulating element.

[0019] In some embodiments, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is disposed on the surface of the negative electrode current collector;

[0020] The negative current collector has a second side surface in the second direction, and the side of the third insulating portion opposite to the positive current collector is flush with the second side surface.

[0021] The negative electrode sheet consists of a negative current collector and a layer of negative active material disposed on the surface of the negative current collector. By making the second side of the negative current collector flush with the side of the third insulating part that is away from the positive current collector, the size of the negative electrode sheet can be larger than that of the positive electrode sheet, reducing the occurrence of lithium plating during battery charging. At the same time, it can reduce the possibility of forming a protruding edge between the negative electrode sheet and the first insulating part, thereby improving the energy density of the cell.

[0022] In some embodiments, the width of the first empty foil area along the second direction is 0.5mm-2.5mm.

[0023] By setting the width of the first empty foil area to 0.5mm-2.5mm, such as 0.5mm, 0.8mm, 1.2mm, 1.5mm or 2mm, it can better serve as a support for insulating protection.

[0024] In some embodiments, the coating area is provided with the first empty foil area on both sides along the second direction, and the positive electrode sheet includes two first insulating members, which respectively wrap the two first empty foil areas.

[0025] By setting first empty foil areas on both sides of the coating area along the second direction, and ensuring that each first empty foil area can be wrapped around the corresponding first insulating element, the positive electrode sheet is insulated and protected on both sides along the second direction, reducing the possibility of end face overlap short circuit caused by bending at misalignment and improving the reliability of the battery cell.

[0026] In some embodiments, the first insulating element is UV insulating adhesive.

[0027] The first insulating component is made of UV insulating adhesive to achieve the insulating and supporting functions of the first insulating component.

[0028] In some embodiments, the positive current collector includes a main body and a positive electrode tab. The main body includes the coating area and the first empty foil area. The positive electrode tab extends from one end of the main body along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0029] The positive electrode tab is disposed on one side of the main body in a third direction to form a positive current collector.

[0030] In some embodiments, the main body further includes a second empty foil region, the surface of which is not provided with the positive electrode active material layer, and the second empty foil region is disposed on at least one side of the coating region along the third direction;

[0031] The positive electrode sheet further includes a second insulating element, which covers the second empty foil area.

[0032] By providing a second empty foil area on at least one side of the main body along a third direction and providing a second insulating member on the second empty foil area, the positive electrode sheet is provided with lateral insulation protection along a third direction, while the negative electrode sheet is supported, thereby improving the reliability of the battery cell.

[0033] In some embodiments, the coating area is provided with second empty foil areas on both sides along the third direction, and the positive electrode sheet includes two second insulating members, which respectively cover the two second empty foil areas.

[0034] By providing second empty foil areas on both sides of the main body along a third direction, and providing a second insulating element on each second empty foil area, insulation protection is provided on both sides of the positive electrode sheet along a third direction, while supporting the negative electrode sheet, thereby improving the reliability of the battery cell.

[0035] In some embodiments, the second insulating member is adjacent to the first insulating member.

[0036] By placing the second insulating element adjacent to the first insulating element, the second insulating element and the first insulating element can form a continuous insulating structure surrounding the positive electrode active material layer, thereby improving the reliability of the battery cell.

[0037] Secondly, this application provides a battery that includes the battery cell described in the above embodiments.

[0038] 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.

[0039] Thirdly, this application provides an electrical device that includes the battery described in the above embodiments.

[0040] 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.

[0041] Fourthly, this application provides an electrode coating apparatus for wrapping a first insulating member in the first empty foil area of ​​the positive electrode sheet of the battery cell in the above embodiments.

[0042] The electrode coating equipment includes a glue supply device and a coating nozzle. The coating nozzle is provided with a first flow channel, a second flow channel, and a spray cavity. The outlet of the first flow channel and the outlet of the second flow channel are respectively connected to the spray cavity, and the outlets of the first flow channel and the second flow channel are arranged opposite to each other along the first direction. The spray cavity is capable of allowing the first empty foil area of ​​the positive electrode to be inserted.

[0043] The adhesive supply device is used to provide insulating adhesive to the first flow channel and the second flow channel, so that the insulating adhesive can be sprayed through the first flow channel and the second flow channel to the first empty foil area of ​​the positive electrode sheet to form the first insulating component.

[0044] In the technical solution of this application embodiment, when wrapping the first insulating element in the first empty foil area, at least a portion of the first empty foil area can be inserted into the spraying chamber first. Then, an insulating adhesive is supplied to the first and second flow channels of the adhesive spraying nozzle through an adhesive supply device, so that the insulating adhesive can be sprayed onto the first empty foil area through each flow channel, thereby forming the first insulating element. This electrode coating equipment can realize rapid spraying of the first insulating element and improve the processing efficiency of the battery cell.

[0045] In some embodiments, the adhesive nozzle and the positive electrode sheet can slide relative to each other in a third direction;

[0046] The first direction, the second direction, and the third direction are perpendicular to each other.

[0047] By sliding the coating nozzle relative to the positive electrode sheet in a third direction, continuous spraying is performed on the first empty foil area located on the side of the coating area in the second direction, thereby improving the processing efficiency of the battery cell.

[0048] In some embodiments, the coating area of ​​the positive electrode sheet is provided with the first empty foil area on both sides along the second direction;

[0049] Two adhesive application nozzles are provided, and the two adhesive application nozzles are arranged opposite to each other along the second direction;

[0050] One of the first empty foil areas of the positive electrode sheet can be inserted into the spray chamber of one of the adhesive coating nozzles, and the other first empty foil area of ​​the positive electrode sheet can be inserted into the spray chamber of the other adhesive coating nozzle.

[0051] When the coating area has first empty foil areas on both sides along the second direction, two adhesive nozzles can be set up so that each first empty foil area is sprayed synchronously by the corresponding adhesive nozzle, thereby improving the processing efficiency of the battery cell.

[0052] 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

[0053] 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:

[0054] Figure 1 This is a schematic diagram of the vehicle structure in some embodiments of this application;

[0055] Figure 2 This is an exploded structural diagram of the battery in some embodiments of this application;

[0056] Figure 3 This is a schematic diagram showing the exploded structure of a single battery cell in some embodiments of this application;

[0057] Figure 4 This is a schematic diagram of the structure of the electrode assembly in a battery cell in some embodiments of this application;

[0058] Figure 5 This is a schematic diagram of the structure of the positive electrode in a single battery cell in some embodiments of this application;

[0059] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0060] Figure 7 This is a schematic diagram of the electrode coating equipment in some embodiments of this application wrapping a first insulating element in the first empty foil area of ​​a battery cell;

[0061] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0062] Figure 9 for Figure 7 Another perspective of the working diagram;

[0063] Figure 10 This is a schematic diagram of the electrode coating equipment in some embodiments of this application.

[0064] The reference numerals in the detailed embodiments are as follows:

[0065] 1000, vehicles;

[0066] 100. Battery; 200. Controller; 300. Motor;

[0067] 10. Box body; 11. First part; 12. Second part;

[0068] 20. Battery cell; 21. Casing; 211. End cap; 22. Electrode assembly; 221. Positive electrode; 2211. Positive current collector; a. Coated area; b. First empty foil area; c. Second empty foil area; S1. First surface; S2. Second surface; S3. First side surface; 22111. Main body; 22112. Positive electrode tab; 2212. Positive active material layer; 2213. First insulating component; 22131. First insulating part; 22132. Second insulating part; 22133. Third insulating part; 2214. Second insulating component; 222. Negative electrode; 2221. Negative current collector; 2222. Negative active material layer; S4. Second side surface; 223. Solid electrolyte layer; 23. Terminal post;

[0069] 400, Glue application nozzle; 401, First flow channel; 402, Second flow channel; 403, Spray chamber. Detailed Implementation

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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).

[0075] 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.

[0076] 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.

[0077] 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 widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0078] 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.

[0079] To reduce the above safety hazards, the applicant discovered that an insulating component can be placed at the edge of the positive electrode sheet, and the insulating component can wrap around the edge of the positive electrode sheet to reduce the possibility of end face short circuit caused by bending at the misaligned protrusion, thereby improving the reliability of the battery cell.

[0080] Based on the above considerations, in order to solve the problem of significant safety hazards in batteries, a battery cell was designed with a first insulating element in the empty foil area of ​​the positive electrode current collector, which can cover the entire first empty foil area. This reduces the possibility of end face short circuits caused by bending at the misalignment point during isostatic pressing after the positive and negative electrode plates are stacked and misaligned, thus improving the reliability of the battery cell. It also reduces the design size of the first insulating element and increases the energy density of the cell.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure 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 disposed 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.

[0085] 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.

[0086] 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.

[0087] Please refer to Figure 2 , Figure 2 This 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 have various structures.

[0088] 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.

[0089] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration 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 configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component (such as...). Figure 5 The first busbar 40 and the second busbar 50 shown are used to realize the electrical connection between multiple battery cells 20.

[0090] 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.

[0091] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3The battery cell 20 includes a casing 21, an electrode assembly 22, and other functional components.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figures 4 to 8 , Figure 4 This is a schematic diagram of the electrode assembly in a battery cell according to some embodiments of this application. Figure 5 and Figure 6 This is a schematic diagram of the structure of the positive electrode in a battery cell according to some embodiments of this application. Figure 7 and Figure 8 This is a schematic diagram illustrating the operation of an electrode coating apparatus according to some embodiments of this application, whereby a first insulating member is wrapped in the first empty foil area of ​​a battery cell. In the diagram, the z-direction is the first direction, the x-direction is the second direction, and the y-direction is the third direction.

[0097] This application provides a battery cell 20, including a housing 21 and an electrode assembly 22. The electrode assembly 22 is disposed inside the housing 21 and has a stacked structure. The electrode assembly 22 includes a positive electrode 221, a negative electrode 222 and a solid electrolyte layer 223. The positive electrode 221 and the negative electrode 222 are stacked along a first direction, and the solid electrolyte layer 223 is disposed between the positive electrode 221 and the negative electrode 222.

[0098] The positive electrode 221 includes a positive current collector 2211 and a positive active material layer 2212. The positive current collector 2211 includes a coating area a and a first empty foil area b. The surface of the coating area a is provided with the positive active material layer 2212, and the surface of the first empty foil area b is not provided with the positive active material layer 2212. Along the second direction, the first empty foil area b is located on at least one side of the coating area a. The second direction is perpendicular to the first direction.

[0099] The positive electrode 221 also includes a first insulating element 2213, which wraps the first empty foil area b.

[0100] The positive electrode current collector 2211 has a first surface S1 and a second surface S2 disposed opposite to each other along a first direction. The positive electrode active material layer 2212 is disposed on the first surface S1 and the second surface S2. The positive electrode current collector 2211 has a first side surface S3 in a second direction. The first side surface S3 is connected to the first surface S1 and the second surface S2.

[0101] The first insulating member 2213 includes a first insulating part 22131, a second insulating part 22132 and a third insulating part 22133. The first insulating part 22131 is disposed on the first surface S1, the second insulating part 22132 is disposed on the second surface S2, and the third insulating part 22133 is disposed on the first side surface S3. The third insulating part 22133 connects the first insulating part 22131 and the second insulating part 22132.

[0102] The 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.

[0103] The positive electrode current collector 2211 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.).

[0104] The positive electrode active material selected for the positive electrode active material layer 2212 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.

[0105] The first direction is the thickness direction of the electrode assembly 22, and the second direction is the width direction of the electrode assembly 22.

[0106] In the technical solution of this application embodiment, the positive electrode current collector 2211 has a first surface S1 and a second surface S2 in a first direction, and a first side surface S3 connecting the first surface S1 and the second surface S2 in a second direction. The edge connecting the first surface S1 and the first side surface S3, the edge connecting the second surface S2 and the first side surface S3, and the first side surface S3 together constitute the first empty foil area b of the positive electrode current collector 2211. By setting a first insulating member 2213 in the first empty foil area b of the positive electrode current collector 2211, and making the three insulating parts of the first insulating member 2213 respectively correspondingly disposed on each surface and side surface, the first insulating member 2213 can wrap the entire first empty foil area b. This reduces the possibility of end face overlap short circuit caused by bending at the misalignment when performing temperature isostatic pressing after the positive electrode sheet 221 and the negative electrode sheet 222 are stacked and misaligned, improves the reliability of the battery cell, and also reduces the design size of the first insulating member 2213, thereby increasing the energy density of the battery cell.

[0107] According to some embodiments of this application, optionally, please continue to refer to Figure 5 and Figure 6 The thickness of the first insulating part 22131, the thickness of the second insulating part 22132, and the thickness of the positive electrode active material layer 2212 are equal.

[0108] Since the positive electrode active material layer 2212 is disposed on the first surface S1 and the second surface S2, by making the thickness of the first insulating portion 22131, the thickness of the second insulating portion 22132 and the thickness of the positive electrode active material layer 2212 equal, the possibility of difficulty in stacking due to the first insulating portion 22131 and the second insulating portion 22132 protruding from the positive electrode active material layer 2212 can be reduced. It can also reduce the possibility of gaps between the insulating portion and the solid electrolyte layer 223 due to the first insulating portion 22131 and the second insulating portion 22132 being recessed into the positive electrode active material layer 2212.

[0109] According to some embodiments of this application, optionally, please continue to refer to Figure 5 and Figure 6 Along the second direction, the width of the positive electrode active material layer 2212 is smaller than the width of the positive electrode current collector 2211, and the widths of the first insulating part 22131 and the second insulating part 22132 are both greater than the width of the third insulating part 22133.

[0110] The first insulating member 2213 has a "C" shaped cross section so that it can wrap around each side of the first empty foil area b.

[0111] According to some embodiments of this application, optionally, please continue to refer to Figure 5 and Figure 6 Along the second direction, the width of the first insulating portion 22131 is the same as the width of the second insulating portion 22132.

[0112] The first insulating portion 22131 and the second insulating portion 22132 are symmetrically arranged along the first direction about the positive current collector 2211 to form a corresponding first insulating member 2213.

[0113] According to some embodiments of this application, optionally, please continue to refer to Figure 4 The negative electrode 222 includes a negative current collector 2221 and a negative active material layer 2222, with the negative active material layer 2222 disposed on the surface of the negative current collector 2221.

[0114] The negative current collector 2221 has a second side surface S4 in the second direction, and the side of the third insulating part 22133 facing away from the positive current collector 2211 is flush with the second side surface S4.

[0115] 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.

[0116] The negative electrode active material selected for the negative electrode active material layer 2222 can be any 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.

[0117] The negative electrode 222 is composed of a negative current collector 2221 and a negative active material layer 2222 disposed on the surface of the negative current collector 2221. By making the second side surface S4 of the negative current collector 2221 flush with the side surface of the third insulating part 22133 facing away from the positive current collector 2211, the size of the negative electrode 222 can be larger than the size of the positive electrode 221, reducing the occurrence of lithium plating during battery charging. At the same time, it can reduce the possibility of forming a protruding edge between the negative electrode 222 and the first insulating part 2213, thereby improving the energy density of the battery cell.

[0118] According to some embodiments of this application, optionally, the width of the first empty foil region b along the second direction is 0.5mm-2.5mm.

[0119] By setting the width of the first empty foil area b to 0.5mm-2.5mm, such as 0.5mm, 0.8mm, 1.2mm, 1.5mm or 2mm, it can better serve as a support for insulation protection.

[0120] According to some embodiments of this application, optionally, please continue to refer to Figure 7 The coating area a has a first empty foil area b on both sides along the second direction. The positive electrode plate 221 includes two first insulating members 2213, which respectively wrap the two first empty foil areas b.

[0121] By setting first empty foil areas b on both sides of the coating area a along the second direction, and ensuring that each first empty foil area b can be wrapped around the corresponding first insulating member 2213, the positive electrode sheet 221 is insulated and protected along the second direction, reducing the possibility of end face overlap short circuit caused by bending at the misalignment and improving the reliability of the battery cell.

[0122] According to some embodiments of this application, optionally, the first insulating element 2213 is a UV insulating adhesive.

[0123] The first insulating component 2213 is made of UV insulating adhesive to achieve the insulating and supporting functions of the first insulating component 2213.

[0124] According to some embodiments of this application, optionally, please continue to refer to Figure 7 The positive current collector 2211 includes a main body 22111 and a positive electrode tab 22112. The main body 22111 includes a coating area a and a first empty foil area b. The positive electrode tab 22112 extends from one end of the main body 22111 along a third direction, with the first direction, the second direction and the third direction being perpendicular to each other.

[0125] The third direction is the length direction of the electrode assembly 22.

[0126] The positive electrode tab 22112 is disposed on one side of the main body 22111 along a third direction to form the positive current collector 2211.

[0127] According to some embodiments of this application, optionally, please continue to refer to Figure 7 and Figure 8 The main body 22111 also includes a second empty foil region c, the surface of which is not provided with a positive electrode active material layer 2212, and along a third direction, the second empty foil region c is disposed on at least one side of the coating region a.

[0128] The positive electrode 221 also includes a second insulating element 2214, which covers the second empty foil area c.

[0129] By providing a second empty foil area c on at least one side of the main body 22111 along a third direction, and providing a second insulating member 2214 on the second empty foil area c, the positive electrode 221 is provided with lateral insulation protection along a third direction, while the negative electrode 222 is supported, thereby improving the reliability of the battery cell.

[0130] According to some embodiments of this application, optionally, please continue to refer to Figure 7 and Figure 8 The coating area a has two second empty foil areas c on both sides along the third direction. The positive electrode plate 221 includes two second insulating members 2214, which respectively cover the two second empty foil areas c.

[0131] By providing second empty foil areas c on both sides of the main body 22111 along the third direction, and providing a second insulating member 2214 on each second empty foil area c, the positive electrode 221 is insulated and protected on both sides along the third direction, while the negative electrode 222 is supported, thereby improving the reliability of the battery cell.

[0132] According to some embodiments of this application, optionally, the second insulating member 2214 is adjacent to the first insulating member 2213.

[0133] By connecting the second insulating member 2214 adjacent to the first insulating member 2213, the second insulating member 2214 and the first insulating member 2213 can form a continuous insulating structure surrounding the positive electrode active material layer 2212, thereby improving the reliability of the battery cell.

[0134] 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.

[0135] 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.

[0136] The electrical device can be any of the aforementioned battery-powered devices or systems.

[0137] Please refer to some embodiments of this application. Figures 7 to 10 , Figures 7 to 9 This is a schematic diagram illustrating the operation of an electrode coating apparatus according to some embodiments of this application, in which a first insulating member 2213 is wrapped around the first empty foil area b of a battery cell. Figure 10 This is a schematic diagram of an electrode coating apparatus according to some embodiments of this application. This application provides an electrode coating apparatus, including a first empty foil region b for wrapping a first insulating member 2213 around the positive electrode 221 of a battery cell in the above embodiments.

[0138] The electrode coating equipment includes a glue supply device and a coating nozzle 400. The coating nozzle 400 is provided with a first flow channel 401, a second flow channel 402, and a spray cavity 403. The outlets of the first flow channel 401 and the second flow channel 402 are respectively connected to the spray cavity 403, and the outlets of the first flow channel 401 and the second flow channel 402 are arranged opposite to each other along a first direction. The spray cavity 403 allows the first empty foil area b of the positive electrode 221 to be inserted.

[0139] The adhesive supply device is used to supply insulating adhesive to the first flow channel 401 and the second flow channel 402, so that the insulating adhesive can be sprayed through the first flow channel 401 and the second flow channel 402 onto the first empty foil area b of the positive electrode sheet 221 to form the first insulating element 2213.

[0140] In the technical solution of this application embodiment, when wrapping the first insulating element 2213 in the first empty foil area b, the first empty foil area b can be at least partially inserted into the spray cavity 403. Then, the insulating adhesive is supplied to the first flow channel 401 and the second flow channel 402 of the adhesive nozzle 400 through the adhesive supply device, so that the insulating adhesive can be sprayed onto the first empty foil area b through each flow channel, thereby forming the first insulating element 2213. This electrode coating equipment can realize the rapid spraying of the first insulating element 2213, improving the processing efficiency of the battery cell.

[0141] According to some embodiments of this application, optionally, please continue to refer to Figure 7 The adhesive nozzle 400 and the positive electrode 221 can slide relative to each other in a third direction.

[0142] The first direction, the second direction, and the third direction are perpendicular to each other.

[0143] By sliding the coating nozzle 400 relative to the positive electrode 221 in a third direction, continuous spraying is performed on the first empty foil area b located on the side of the coating area a in the second direction, thereby improving the processing efficiency of the battery cell.

[0144] According to some embodiments of this application, optionally, please continue to refer to Figure 5 , Figure 7 and Figure 8 The coating area a of the positive electrode 221 has a first empty foil area b on both sides along the second direction.

[0145] There are two adhesive application nozzles 400, which are arranged opposite each other along the second direction.

[0146] One of the first empty foil regions b of the positive electrode 221 can be inserted into the spray cavity 403 of one of the adhesive coating nozzles 400, and the other first empty foil region b of the positive electrode 221 can be inserted into the spray cavity 403 of another adhesive coating nozzle 400.

[0147] When the coating area a has first empty foil areas b on both sides along the second direction, the processing efficiency of the battery cell can be improved by setting two adhesive nozzles 400 so that each first empty foil area b is sprayed synchronously by the corresponding adhesive nozzle 400.

[0148] According to some embodiments of this application, see Figures 3 to 8 This application provides a battery cell 20, which includes a housing 21 and an electrode assembly 22 disposed within the housing 21. The electrode assembly 22 has a stacked structure and includes a positive electrode 221, a negative electrode 222 and a solid electrolyte layer 223. The positive electrode 221 and the negative electrode 222 are stacked along a first direction, and the solid electrolyte layer 223 is disposed between the positive electrode 221 and the negative electrode 222.

[0149] The positive electrode 221 includes a positive current collector 2211, a positive active material layer 2212, two first insulating members 2213, and two second insulating members 2214. The positive current collector 2211 includes a main body 22111 and a positive electrode tab 22112. The main body 22111 includes a coating area a, first empty foil areas b disposed on both sides of the coating area a along a second direction, and second empty foil areas c disposed on both sides of the coating area a along a third direction. The surface of the coating area a is provided with the positive active material layer 2212, while the surfaces of the first empty foil areas b and the second empty foil areas c are not provided with the positive active material layer 2212.

[0150] Two first insulating elements 2213 respectively wrap two first empty foil areas b, and two second insulating elements 2214 respectively cover two second empty foil areas c.

[0151] The positive electrode current collector 2211 has a first surface S1, a second surface S2 and a first side surface S3. The first surface S1 and the second surface S2 are arranged opposite to each other along a first direction. The first side surface S3 connects the first surface S1 and the second surface S2. The positive electrode active material layer 2212 is disposed on the first surface S1 and the second surface S2.

[0152] The first insulating member 2213 includes a first insulating portion 22131 disposed on the first surface S1, a second insulating portion 22132 disposed on the second surface S2, and a third insulating portion 22133 disposed on the first side surface S3. The third insulating portion 22133 connects the first insulating portion 22131 and the second insulating portion 22132. The cross-section of the first insulating member 2213 is C-shaped.

[0153] 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, The application relates to a battery electrode assembly, comprising: a shell; and an electrode assembly arranged in the shell, the electrode assembly being a laminated structure, the electrode assembly comprising a positive electrode sheet, a negative electrode sheet and a solid-state electrolyte layer, the positive electrode sheet and the negative electrode sheet being arranged in a first direction, and the solid-state electrolyte layer being arranged between the positive electrode sheet and the negative electrode sheet; the positive electrode sheet comprising a positive electrode current collector and a positive electrode active material layer, the positive electrode current collector comprising a coated area and a first empty foil area, the surface of the coated area being provided with the positive electrode active material layer, the surface of the first empty foil area being not provided with the positive electrode active material layer, the first empty foil area being arranged on at least one side of the coated area in a second direction, and the second direction being perpendicular to the first direction; wherein the positive electrode sheet further comprises a first insulating member, and the first insulating member wraps the first empty foil area; the positive electrode current collector having a first surface and a second surface arranged oppositely in the first direction, the positive electrode active material layer being arranged on the first surface and the second surface, and the positive electrode current collector having a first side surface in the second direction, the first side surface connecting the first surface and the second surface; the first insulating member comprising a first insulating part, a second insulating part and a third insulating part, the first insulating part being arranged on the first surface, the second insulating part being arranged on the second surface, and the third insulating part being arranged on the first side surface, and the third insulating part connecting the first insulating part and the second insulating part; the width of the first empty foil area being 0.8-2.5 mm in the second direction; the thickness of the first insulating part, the thickness of the second insulating part and the thickness of the positive electrode active material layer being equal; the first insulating member being a UV insulating adhesive, the first insulating member being formed by spraying through a sheet coating equipment, and the first insulating member being an integrally formed structure.

2. The battery cell of claim 1, wherein, the width of the positive electrode active material layer being smaller than the width of the positive electrode current collector in the second direction, and the width of the first insulating part and the width of the second insulating part being both larger than the width of the third insulating part.

3. The battery cell of claim 2, wherein, the width of the first insulating part being consistent with the width of the second insulating part in the second direction.

4. The battery cell of claim 1, wherein, the negative electrode sheet comprising a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer being arranged on the surface of the negative electrode current collector; the negative electrode current collector having a second side surface in the second direction, and the side of the third insulating part, which is away from the positive electrode current collector, being flush with the second side surface.

5. The battery cell of claim 1, wherein, both sides of the coated area in the second direction are provided with the first empty foil area, the positive electrode sheet comprising two first insulating members, and the two first insulating members wrapping the two first empty foil areas respectively.

6. The battery cell of claim 1, wherein, the positive electrode current collector comprising a main body part and a positive electrode tab, the main body part comprising the coated area and the first empty foil area, the positive electrode tab extending from one end of the main body part in a third direction, and the first direction, the second direction and the third direction being perpendicular to each other.

7. The battery cell of claim 6, wherein, The main body part further comprises a second empty foil area, a surface of the second empty foil area is not provided with the positive active material layer, and the second empty foil area is arranged on at least one side of the coated area along the third direction; The positive electrode tab further comprises a second insulating piece, and the second insulating piece covers the second empty foil area.

8. The battery cell of claim 7, wherein, The coated area is provided with the second empty foil area on both sides along the third direction, and the positive electrode tab comprises two second insulating pieces, and the two second insulating pieces respectively cover the two second empty foil areas.

9. The battery cell of claim 7, wherein, The second insulating piece is adjacent to the first insulating piece.

10. A battery, characterized by The battery cell comprises the battery cell as claimed in any one of claims 1-9.

11. An electrical device, characterized by The battery comprises the battery cell as claimed in any one of claims 1-9 or the battery as claimed in claim 10.

12. A pole piece gluing apparatus characterized by, The first empty foil area of the positive electrode tab of the battery cell as claimed in any one of claims 1-9 is wrapped with the first insulating piece; The tab gluing device comprises a glue supply device and a gluing nozzle, the gluing nozzle is provided with a first flow channel, a second flow channel and a spray cavity, the outlet of the first flow channel and the outlet of the second flow channel respectively communicate with the spray cavity, and the outlet of the first flow channel and the outlet of the second flow channel are oppositely arranged along the first direction; the spray cavity can be inserted with the first empty foil area of the positive electrode tab; The glue supply device is used to supply the insulating glue to the first flow channel and the second flow channel, so that the insulating glue can be sprayed to the first empty foil area of the positive electrode tab through the first flow channel and the second flow channel to form the first insulating piece.

13. The pole piece gluing apparatus according to claim 12, wherein The gluing nozzle and the positive electrode tab can slide relative to each other along the third direction; The first direction, the second direction and the third direction are perpendicular to each other.

14. The pole piece gluing apparatus according to claim 12 or 13, characterized by, The coated area of the positive electrode tab is provided with the first empty foil area on both sides along the second direction; The gluing nozzle is provided with two, and the two gluing nozzles are oppositely arranged along the second direction; One of the first empty foil areas of the positive electrode tab can be inserted into the spray cavity of one of the gluing nozzles, and the other of the first empty foil areas of the positive electrode tab can be inserted into the spray cavity of the other gluing nozzle.

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