Battery monomer, battery, electric equipment, and battery processing equipment and method

Abstract

The embodiment of the invention provides a battery monomer, a battery, electric equipment, and battery processing equipment and method, and belongs to the technical field of batteries. The battery monomer comprises a shell; the electrode assembly is arranged in the shell, the electrode assembly comprises a negative pole piece and a positive pole piece, and the negative pole piece and the positive pole piece are arranged in a stacked mode in the first direction; the negative electrode plate comprises a negative electrode current collector, a negative electrode active material layer coated on at least one side surface of the negative electrode current collector along the first direction, and a solid electrolyte layer coated on the negative electrode active material layer; wherein the edge of one side, facing the solid electrolyte layer, of the negative electrode active material layer is provided with a supporting piece, and the supporting piece is made of an insulating material; in the first direction, the supporting piece is located between the negative active material layer and the solid electrolyte layer and is used for reducing the possibility that the edge of the negative pole piece is bent or broken, so that the reliability of the battery monomer 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 processing device and a method. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important 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 in battery technology. 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 processing device and a method to reduce the possibility of bending or breaking of the edge of the negative electrode plate, thereby improving the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery, comprising: Housing; and An electrode assembly is disposed in the housing, the electrode assembly comprising a negative electrode sheet and a positive electrode sheet, the negative electrode sheet and the positive electrode sheet are stacked along a first direction; the negative electrode sheet comprises a negative electrode current collector, a negative electrode active material layer coated on at least one side of the negative electrode current collector along the first direction, and a solid electrolyte layer coated on the negative electrode active material layer; A support is provided on the edge of the negative electrode active material layer facing the solid electrolyte layer, and the support is made of insulating material; along the first direction, the support is located between the negative electrode active material layer and the solid electrolyte layer.

[0006] In the technical solution of the embodiment of the present application, the insulating material can be first coated on the edge of one side of the negative electrode active material layer, and then the electrolyte material can be coated on the insulating material and the portion of the negative electrode active material layer exposed from the insulating material, so that an insulating support can be formed on the edge of the negative electrode active material layer facing the solid electrolyte layer, and the support is located between the negative electrode active material layer and the solid electrolyte layer along the first direction, so as to support the edge of the negative electrode plate, reduce the possibility of bending or breaking of the edge of the negative electrode plate under pressure, and thus improve the reliability of the battery cell. In addition, since the electrolyte material is coated after the insulating material, the surface of the negative electrode plate can be smoother, reducing the possibility of short circuit caused by bending or breaking of the plate under pressure due to the thickness error of the support member or the thickness error of the negative electrode plate during lamination, further improving the reliability of the battery cell.

[0007] In some embodiments, the solid electrolyte layer includes an edge region and a center region; along the first direction, the center region is adjacent to the negative electrode active material layer, the support member is located between the negative electrode active material layer and the edge region, and the side of the edge region facing away from the negative electrode current collector is flush with the side of the center region facing away from the negative electrode current collector.

[0008] After the support is arranged at the edge area of ​​the solid electrolyte layer, the central area will be exposed from the support, so that after the electrolyte material is coated, the central area can be adjacent to the negative electrode active material layer, and the support is located between the negative electrode active material layer and the edge area. By making the side of the edge area facing away from the negative electrode current collector and the side of the central area facing away from the negative electrode current collector flush, the surface of the negative electrode plate is made smoother.

[0009] In some embodiments, the support member is annular and is disposed around an edge of the negative electrode active material layer.

[0010] The support member is arranged in a ring shape and is arranged around the edge of the negative electrode active material layer to support the edge of the negative electrode plate. In this case, the edge area can be arranged around the periphery of the central area, and the edge area is annular, so that the support member is arranged between the negative electrode active material layer and the edge area.

[0011] In some embodiments, the outer edge of the negative electrode active material layer, the outer edge of the solid electrolyte layer, and the outer edge of the support member are all flush with the outer edge of the negative electrode current collector.

[0012] The outer edge of the negative electrode active material layer, the outer edge of the solid electrolyte layer and the outer edge of the support are all flush with the outer edge of the negative electrode collector to form a relatively flat outer wall of the negative electrode plate.

[0013] In some embodiments, both side surfaces of the negative electrode current collector along the first direction are coated with the negative electrode active material layer, and the side surface of each negative electrode active material layer facing away from the negative electrode current collector is coated with the solid electrolyte layer.

[0014] The negative electrode sheet is formed by coating negative electrode active material layers on both sides of the negative electrode current collector along the first direction, and coating the solid electrolyte layer on each negative electrode active material layer.

[0015] In some embodiments, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on both side surfaces of the positive electrode current collector along the first direction. At this time, the positive electrode sheet is composed of a positive electrode current collector and positive electrode active material layers disposed on both side surfaces of the positive electrode current collector.

[0016] In some embodiments, the support member is made of UV insulating glue.

[0017] The support is made of UV insulating glue to achieve the insulation and supporting function of the support.

[0018] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0019] The battery provided in the present application comprises the battery monomer described in any one of the embodiments of the first aspect, and thus has the technical effects described in any one of the embodiments above, which will not be described in detail herein.

[0020] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment.

[0021] 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 embodiments above, which will not be described in detail here.

[0022] In a fourth aspect, the present application provides a battery processing device, which is suitable for processing the electrode assembly of the battery monomer described in any of the above embodiments, the battery processing device includes a feeding device, a first coating device, a second coating device and a cutting device, the feeding device is used to provide a substrate, the substrate includes a current collector layer and a negative electrode active material coated on at least one side of the current collector layer; The first coating device is used to coat the insulating material on the negative electrode active material to form an insulating layer; the insulating layer includes two first insulating parts respectively arranged along the two long sides of the substrate, and a plurality of second insulating parts spaced apart between the two first insulating parts; The second coating device is used to coat the electrolyte material on the negative electrode active material exposed on the insulating material and the insulating material to form a material to be cut; The cutting device is used to cut the material to be cut along the center line of each second insulating portion to form the negative electrode sheet provided with a support member composed of the insulating material and a solid electrolyte layer composed of the electrolyte material.

[0023] In the technical solution of the embodiment of the present application, when processing the electrode assembly, the insulating material is first coated on the negative electrode active material by the first coating device to form an insulating layer, and then the electrolyte material is coated on the negative electrode active material and the insulating material exposed to the insulating material by the second coating device to form the material to be cut. After the material to be cut is formed, the material to be cut is cut along the center line of each second insulating portion of the insulating layer by the cutting device to form a negative electrode sheet provided with a support. The surface of the negative electrode sheet of the electrode assembly processed by the battery processing equipment can be smoother, and the possibility of bending or breaking of the edge of the negative electrode sheet can be reduced, thereby improving the reliability of the battery cell.

[0024] In some embodiments, the feeding device includes a feeding roller, and the substrate is wound around the feeding roller.

[0025] The feeding device is composed of a feeding roller to provide the wound substrate.

[0026] In some embodiments, the first coating device includes a coating mechanism and a curing mechanism, the coating mechanism is used to coat the insulating material on the negative electrode active material, and the curing mechanism is used to cure the insulating material coated on the negative electrode active material to form the insulating layer.

[0027] When the first coating device is coating the insulating material, the insulating material can be first coated on the negative electrode active material by the coating mechanism, and then the insulating material coated on the negative electrode active material can be cured and shaped by the curing mechanism to avoid deformation of the insulating layer when the second coating device is coating the electrolyte material, thereby affecting the performance of the negative electrode plate.

[0028] In some embodiments, the coating mechanism is used to apply the insulating material by screen printing or spraying.

[0029] The insulating material can be coated on the negative electrode active material by screen printing or spraying. When screen printing is used, the coating mechanism is a screen printing mechanism; when spraying is used, the coating mechanism is a spraying mechanism.

[0030] In some embodiments, the first coating device is further used to apply marking points on the outside of the center line of each of the second insulating parts; The cutting device is used to cut the material to be cut according to each of the marking points.

[0031] By dotting marking points on the outside of the center line of each second insulating part, the position of the center line of each second insulating part can be marked to facilitate the subsequent cutting work of the cutting device.

[0032] In a fifth aspect, the present application provides a battery processing method, which is suitable for processing the electrode assembly of the battery cell described in any of the above embodiments, and the battery processing method comprises: Providing a substrate; wherein the substrate comprises a current collector layer and a negative electrode active material coated on at least one side surface of the current collector layer; An insulating material is coated on the negative electrode active material to form an insulating layer; the insulating layer comprises two first insulating portions respectively arranged along the two long sides of the substrate, and a plurality of second insulating portions spaced apart between the two first insulating portions; Coating an electrolyte material on the negative electrode active material exposed from the insulating material and the insulating material to form a material to be cut; Cutting the material to be cut along the center line of each second insulating portion to form the negative electrode sheet provided with a support member made of the insulating material and a solid electrolyte layer made of the electrolyte material; preparing a positive electrode sheet; The negative electrode sheet and the positive electrode sheet are stacked to form an electrode assembly.

[0033] In the technical solution of the embodiment of the present application, when processing the electrode assembly, an insulating material is first coated on the negative electrode active material to form an insulating layer, and then an electrolyte material is coated on the negative electrode active material and the insulating material exposed to the insulating material to form a material to be cut. After the material to be cut is formed, the material to be cut is cut along the center line of each second insulating portion of the insulating layer to form a negative electrode sheet provided with a support. Afterwards, the negative electrode sheet and the positive electrode sheet are stacked to form an electrode assembly. The surface of the negative electrode sheet of the electrode assembly processed by the battery processing equipment can be smoother, and the possibility of bending or breaking of the edge of the negative electrode sheet can be reduced, thereby improving the reliability of the battery cell.

[0034] In some embodiments, in the step of coating the insulating material on the negative electrode active material to form the insulating layer, the insulating material is coated by screen printing or spraying.

[0035] Thus, the insulating material can be coated on the negative electrode active material by screen printing or spraying.

[0036] In some embodiments, during the step of coating the insulating material on the negative electrode active material to form the insulating layer, marking points are dotted outside the center line of each second insulating portion; In the step of cutting the material to be cut along the center line of each second insulating portion, the material to be cut is cut according to each marking point.

[0037] By dotting marking points on the outside of the center line of each second insulating part, the position of the center line of each second insulating part can be marked to facilitate the subsequent cutting work of the cutting device.

[0038] 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

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic diagram of the structure 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 A schematic diagram of the exploded structure of a battery cell in some embodiments of the present application; Figure 4 A schematic diagram of the structure of an electrode assembly in a battery cell in some embodiments of the present application; Figure 5 A schematic diagram of the structure of a negative electrode sheet in a battery cell in some embodiments of the present application; Figure 6 This is a schematic diagram of the structure of a substrate in some embodiments of the present application; Figure 7 It is a schematic diagram of the structure of the battery processing equipment in some embodiments of the present application; Figure 8 A schematic diagram of the working principle of a battery processing device in some embodiments of the present application; Fig. 9 for Figure 8 Schematic diagram of coating of the substrate; Fig.10 Schematic diagram of the process of battery processing in some embodiments of the present application.

[0040] The reference numerals in the specific implementation manner are as follows: 1000. Vehicles; 100, battery; 200, controller; 300, motor; 10. Box body; 11. First part; 12. Second part; 20. Battery cell; 21. Shell; 211. End cap; 212. Shell; 22. Electrode assembly; 23. Post; 221. Negative electrode sheet; 2211. Negative current collector; 2212. Negative active material layer; 2213. Solid electrolyte layer; 22131. Edge region; 22132. Center region; 222. Positive electrode sheet; 2221. Positive current collector; 2222. Positive active material layer; 223. Support member; 2000, battery processing equipment; 400, feeding device; 401, feeding roller; 500, first coating device; 501, coating mechanism; 502, curing mechanism; 600, second coating device; a, substrate; a1, current collector layer; a2, negative electrode active material; b, insulating layer; b1, first insulating part; b2, second insulating part; c, electrolyte material; d, marking point. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] 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).

[0046] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0049] The inventors of the present invention have noticed that in an electrode assembly, the size of the negative electrode sheet in at least one of the length and width directions is usually larger than that of the positive electrode sheet. Since the overall structural strength of the protruding area of ​​the negative electrode sheet is relatively weak, the protruding area will bend under the action of pressure when the electrode assembly is subjected to warm isostatic pressing. After bending, the protruding area may break at the junction with the normal pressure area, and the burrs generated by the broken edge may pierce the diaphragm; in addition, the protruding area may also cause the overlap of the positive and negative electrode sheets, thereby causing a short circuit between the positive and negative electrode sheets, resulting in a greater safety hazard for the battery.

[0050] 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, so as to cope with the pressure during warm isostatic pressing through the insulating supports.

[0051] Based on the above considerations, in order to solve the problem of the great safety hazard of the battery, a battery cell is designed, in which an insulating support is formed at the edge of the negative electrode active material layer facing the solid electrolyte layer, and the support is located between the negative electrode active material layer and the solid electrolyte layer along the first direction, so as to support the edge of the negative electrode plate, reduce the possibility of bending or breaking of the edge of the negative electrode plate under pressure, and thus improve the reliability of the battery cell. In addition, since the electrolyte material is coated after the insulating material, the surface of the negative electrode plate can be smoother, reducing the possibility of short circuit caused by bending or breaking of the plate under pressure due to the thickness error of the support member or the thickness error of the negative electrode plate during lamination, further improving the reliability of the battery cell.

[0052] The battery disclosed in the embodiment of the present application can be used in, but not limited to, 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.

[0053] The technical solutions described in the embodiments of the present application are applicable to various battery-powered electrical devices, such as mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0055] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, or may be used in the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0056] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein 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 starting, navigating, and driving the vehicle 1000 .

[0057] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0058] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. The box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can adopt a variety of structures.

[0059] In some embodiments, the box body 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 jointly define a storage space for accommodating the battery cell 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, the first portion 11 covers the open side of the second portion 12, so that the first portion 11 and the second portion 12 jointly define a storage space; the first portion 11 and the second portion 12 may also be hollow structures with one side open, and the open side of the first portion 11 covers the open side of the second portion 12. Of course, the box body 10 formed by the first portion 11 and the second portion 12 may be in various shapes, such as a cylinder, a cuboid, etc.

[0060] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may 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 may also be a battery module formed by 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 may also include other structures, for example, the battery 100 may also include a converging component (such as Figure 5 The first busbar 40 and the second busbar 50 shown in FIG. 1 are used to realize electrical connection between multiple battery cells 20.

[0061] 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.

[0062] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes a housing 21, an electrode assembly 22 and other functional components.

[0063] The housing 21 includes an end cap 211 and a shell 212. The end cap 211 is a component that 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.

[0064] Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as poles 23 can be provided on the end cap 211. The pole 23 can be used to electrically connect with the electrode assembly 22 for outputting or inputting the electric energy of the battery cell 20. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing the 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 a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 211, and the insulating member can be used to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0065] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 212 and the end cap 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 211 at the opening. Without limitation, the end cap 211 and the shell 212 can also be integrated. Specifically, the end cap 211 and the shell 212 can form a common connection surface before other components are put into the shell, and when the interior of the shell 212 needs to be encapsulated, the end cap 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0066] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included 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 lug. The negative electrode lug and the positive electrode lug 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 lugs connect the electrode terminals to form a current loop.

[0067] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figures 4 to 5 , Figure 4 is a schematic diagram of the structure of an electrode assembly in a battery cell according to some embodiments of the present application, Figure 5 The present invention is a schematic diagram of the structure of the negative electrode sheet in the battery cell according to some embodiments of the present application. The present application provides a battery cell 20, including a housing 21 and an electrode assembly 22, wherein the electrode assembly 22 is disposed in the housing 21, and the electrode assembly 22 includes a negative electrode sheet 221 and a positive electrode sheet 222, wherein the negative electrode sheet 221 and the positive electrode sheet 222 are stacked along a first direction. The negative electrode sheet 221 includes a negative electrode current collector 2211, a negative electrode active material layer 2212 coated on at least one side surface of the negative electrode current collector 2211 along the first direction, and a solid electrolyte layer 2213 coated on the negative electrode active material layer 2212.

[0068] A support 223 is disposed on the edge of the negative electrode active material layer 2212 facing the solid electrolyte layer 2213 . The support 223 is made of insulating material and is located between the negative electrode active material layer 2212 and the solid electrolyte layer 2213 along the first direction.

[0069] As an example, the solid electrolyte layer 2213 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.

[0070] As an example, the negative electrode current collector 2211 may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium may be used.

[0071] As an example, the negative electrode active material selected for the negative electrode active material layer 2212 may be a negative electrode active material for a battery 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, lithium titanate, etc. The silicon-based material may 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 may 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 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0072] In the technical solution of the embodiment of the present application, the insulating material can be first coated on the edge of one side of the negative active material layer 2212, and then the electrolyte material can be coated on the insulating material and the portion of the negative active material layer 2212 exposed from the insulating material, so that an insulating support member 223 can be formed on the edge of the negative active material layer 2212 facing the solid electrolyte layer 2213, and the support member 223 is located between the negative active material layer 2212 and the solid electrolyte layer 2213 along the first direction, so as to support the edge of the negative electrode sheet 221, reduce the possibility of bending or breaking of the edge of the negative electrode sheet 221 under pressure, and thus improve the reliability of the battery cell 20. In addition, since the electrolyte material is coated after the insulating material, the surface of the negative electrode sheet 221 can be made smoother, reduce the possibility of short circuit caused by bending or breaking of the sheet under pressure due to thickness error of the support member 223 or thickness error of the negative electrode sheet 221 during lamination, and further improve the reliability of the battery cell 20.

[0073] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 The solid electrolyte layer 2213 includes an edge region 22131 and a central region 22132. Along the first direction, the central region 22132 is adjacent to the negative electrode active material layer 2212, the support member 223 is located between the negative electrode active material layer 2212 and the edge region 22131, and the side of the edge region 22131 facing away from the negative electrode current collector 2211 is flush with the side of the central region 22132 facing away from the negative electrode current collector 2211.

[0074] After the support member 223 is disposed in the edge region 22131 of the solid electrolyte layer 2213, the central region 22132 will be exposed from the support member 223, so that after the electrolyte material is coated, the central region 22132 can be adjacent to the negative electrode active material layer 2212, and the support member 223 is located between the negative electrode active material layer 2212 and the edge region 22131. By making the side of the edge region 22131 facing away from the negative electrode current collector 2211 and the side of the central region 22132 facing away from the negative electrode current collector 2211 flush, the surface of the negative electrode sheet 221 is made smoother.

[0075] According to some embodiments of the present application, optionally, the support member 223 is ring-shaped, and the support member 223 is disposed around the edge of the negative electrode active material layer 2212 .

[0076] The support member 223 is set in a ring shape and can be set around the edge of the negative electrode active material layer 2212 to support the edge of the negative electrode plate 221. At this time, the edge area 22131 can be set around the periphery of the central area 22132, and the edge area 22131 is ring-shaped, so that the support member 223 is set between the negative electrode active material layer 2212 and the edge area 22131.

[0077] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 The outer edge of the negative electrode active material layer 2212 , the outer edge of the solid electrolyte layer 2213 , and the outer edge of the support member 223 are all flush with the outer edge of the negative electrode current collector 2211 .

[0078] By making the outer edge of the negative active material layer 2212, the outer edge of the solid electrolyte layer 2213 and the outer edge of the support member 223 flush with the outer edge of the negative current collector 2211, the outer peripheral surface of the negative active material layer 2212, the outer peripheral surface of the solid electrolyte layer 2213 and the outer peripheral surface of the support member 223 are all smoothly connected to the outer peripheral surface of the negative current collector 2211, so as to form a relatively flat outer wall of the negative electrode plate 221.

[0079] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 and Figure 5 Both side surfaces of the negative electrode current collector 2211 along the first direction are coated with a negative electrode active material layer 2212 , and the side surface of each negative electrode active material layer 2212 facing away from the negative electrode current collector 2211 is coated with a solid electrolyte layer 2213 .

[0080] The negative electrode sheet 221 is formed by coating the negative electrode active material layer 2212 on both sides of the negative electrode current collector 2211 along the first direction, and coating the solid electrolyte layer 2213 on each negative electrode active material layer 2212 .

[0081] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 The positive electrode sheet 222 includes a positive electrode current collector 2221 and a positive electrode active material layer 2222 coated on both side surfaces of the positive electrode current collector 2221 along a first direction. As an example, the positive electrode current collector 2221 may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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.).

[0082] As an example, the positive active material selected for the positive active material layer 2222 may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive active materials for batteries may also be used.

[0083] At this time, the positive electrode sheet 222 is composed of a positive electrode current collector 2221 and a positive electrode active material layer 2222 disposed on both side surfaces of the positive electrode current collector 2221 .

[0084] According to some embodiments of the present application, optionally, the support member 223 is made of UV (Ultraviolet Rays) insulating glue.

[0085] The support member 223 is made of UV insulating adhesive to achieve the insulation and support functions of the support member 223 .

[0086] 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.

[0087] According to some embodiments of the present application, the present application also provides an electrical device, comprising a battery according to any of the above schemes, and the battery is used to provide electrical energy to the electrical device.

[0088] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0089] According to some embodiments of this application, please refer to Figures 6 to 9 , Figure 6 is a schematic structural diagram of a substrate according to some embodiments of the present application, Figure 7 is a schematic diagram of the structure of a battery processing device according to some embodiments of the present application. Figure 8 and Fig. 9Schematic diagram of the working principle of battery processing equipment according to some embodiments of the present application. The present application provides a battery processing equipment 2000, which is suitable for processing the electrode assembly 22 of the battery cell 20 of any of the above embodiments, and the battery processing equipment 2000 includes a feeding device 400, a first coating device 500, a second coating device 600 and a cutting device, and the feeding device 400 is used to provide a substrate a, and the substrate a includes a current collector layer a1 and a negative electrode active material a2 coated on at least one side of the current collector layer a1.

[0090] The first coating device 500 is used to coat the insulating material on the negative active material a2 to form an insulating layer b. The insulating layer b includes two first insulating portions b1 respectively arranged along the two long sides of the substrate a, and a plurality of second insulating portions b2 spaced between the two first insulating portions b1.

[0091] The second coating device 600 is used to coat the electrolyte material c on the negative electrode active material a2 exposed from the insulating material and the insulating material to form the material to be cut.

[0092] The cutting device is used to cut the material to be cut along the center line of each second insulating portion b2 to form a negative electrode sheet 221 provided with a support member 223. The support member 223 is made of insulating material; in the negative electrode sheet 221, the negative electrode current collector 2211 is made of the current collector layer a1, the negative electrode active material layer 2212 is made of the negative electrode active material a2, and the solid electrolyte layer 2213 is made of the electrolyte material c.

[0093] As an example, the two first insulating portions b1 are parallel to each other, and the second insulating portion b2 is perpendicular to the first insulating portion b1. At this time, the center line of the second insulating portion b2 is parallel to the width direction of the substrate a.

[0094] In the technical solution of the embodiment of the present application, when processing the electrode assembly 22, the insulating material is first coated on the negative electrode active material a2 by the first coating device 500 to form an insulating layer b, and then the electrolyte material c is coated on the negative electrode active material a2 and the insulating material exposed to the insulating material by the second coating device 600 to form the material to be cut. After the material to be cut is formed, the material to be cut is cut along the center line of each second insulating portion b2 of the insulating layer b by the cutting device to form a negative electrode sheet 221 provided with a support 223. The surface of the negative electrode sheet 221 of the electrode assembly 22 processed by the battery processing equipment 2000 can be smoother, and the possibility of bending or breaking of the edge of the negative electrode sheet 221 can be reduced, thereby improving the reliability of the battery cell 20. In addition, before the material to be cut is cut, since the insulating material is wrapped inside the electrolyte material c, it is difficult for the insulating materials to contact and adhere to each other when the material to be cut is rolled up.

[0095] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 The feeding device 400 includes a feeding roller 401 , and the substrate a is wound around the feeding roller 401 .

[0096] The feeding device 400 is composed of a feeding roller 401 to provide the wound substrate a.

[0097] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 and Figure 8 The first coating device 500 includes a coating mechanism 501 and a curing mechanism 502. The coating mechanism 501 is used to coat the insulating material on the negative electrode active material a2. The curing mechanism 502 is used to cure the insulating material coated on the negative electrode active material a2 to form an insulating layer b.

[0098] When the first coating device 500 is coating the insulating material, the coating mechanism 501 can first coat the insulating material on the negative electrode active material a2, and then the curing mechanism 502 can cure and shape the insulating material coated on the negative electrode active material a2, so as to avoid deformation of the insulating layer b when the second coating device 600 is coating the electrolyte material c, thereby affecting the performance of the negative electrode plate 221.

[0099] According to some embodiments of the present application, optionally, the coating mechanism 501 is used to coat the insulating material by screen printing or spraying.

[0100] The insulating material can be coated on the negative electrode active material a2 by screen printing or spraying. When screen printing is used, the coating mechanism 501 is a screen printing mechanism. When spraying is used, the coating mechanism 501 is a spraying mechanism.

[0101] According to some embodiments of the present application, optionally, please continue to refer to Fig. 9 The first coating device 500 is also used to apply marking points d on the outside of the center line of each second insulating part b2.

[0102] The cutting device is used to cut the material to be cut according to each marking point d.

[0103] When the electrolyte material c is applied, the electrolyte material c will cover the second insulating portion b2 of the insulating layer b, making cutting inconvenient. By applying a marking point d on the outside of the center line of each second insulating portion b2, the position of the center line of each second insulating portion b2 can be marked to facilitate the subsequent cutting work of the cutting device.

[0104] According to some embodiments of this application, please refer to Fig.10 The present application provides a battery processing method, which is suitable for processing the electrode assembly 22 of the battery cell 20 of any of the above embodiments, and the battery processing method includes: Step S1, providing a substrate a. The substrate a comprises a current collector layer a1 and a negative electrode active material a2 coated on at least one side of the current collector layer a1.

[0105] Step S2, coating the negative active material a2 with an insulating material to form an insulating layer b. The insulating layer b includes two first insulating portions b1 respectively disposed along the two long sides of the substrate a, and a plurality of second insulating portions b2 spaced apart between the two first insulating portions b1.

[0106] Step S3: coating the electrolyte material c on the negative electrode active material a2 exposed on the insulating material and the insulating material to form a material to be cut.

[0107] Step S4, cutting the material to be cut along the center line of each second insulating portion b2 to form a negative electrode sheet 221 having a support member 223 made of an insulating material and a solid electrolyte layer 2213 made of an electrolyte material c.

[0108] Step S5: preparing the positive electrode sheet 222.

[0109] Step S6: stack the negative electrode sheet 221 and the positive electrode sheet 222 to form the electrode assembly 22 .

[0110] In the technical solution of the embodiment of the present application, when processing the electrode assembly 22, an insulating material is first coated on the negative electrode active material a2 to form an insulating layer b, and then an electrolyte material c is coated on the negative electrode active material a2 and the insulating material exposed to the insulating material to form a material to be cut. After the material to be cut is formed, the material to be cut is cut along the center line of each second insulating portion b2 of the insulating layer b to form a negative electrode sheet 221 provided with a support 223. Afterwards, the negative electrode sheet 221 and the positive electrode sheet 222 are stacked to form an electrode assembly 22. The surface of the negative electrode sheet 221 of the electrode assembly 22 processed by the battery processing equipment 2000 can be smoother, and the possibility of bending or breaking of the edge of the negative electrode sheet 221 can be reduced, thereby improving the reliability of the battery cell 20. In addition, before the material to be cut is cut, since the insulating material is wrapped inside the electrolyte material c, it is difficult for the insulating materials to contact and adhere to each other when the material to be cut is rolled up.

[0111] According to some embodiments of the present application, optionally, if both sides of the current collector layer a1 are coated with negative electrode active material a2, then when performing steps S2 and S3, the insulating material and electrolyte material c may be coated on the surface of the negative electrode active material a2 on one side of the current collector layer a1 first, and after the single-side coating is completed, the film is rolled up, and then steps S2 and S3 are repeated to coat the insulating material and electrolyte material c on the surface of the negative electrode active material a2 on the other side of the current collector layer a1, until the negative electrode active material a2 on both sides of the current collector layer a1 is coated with the insulating material and electrolyte material c. Alternatively, when performing steps S2 and S3, the insulating material and electrolyte material c may be coated on the surface of the negative electrode active material a2 on both sides of the current collector layer a1 simultaneously.

[0112] According to some embodiments of the present application, optionally, in the step of coating an insulating material on the negative electrode active material a2 to form the insulating layer b, the insulating material is coated by screen printing or spraying.

[0113] Thus, the insulating material can be coated on the negative electrode active material a2 by screen printing or spraying.

[0114] According to some embodiments of the present application, optionally, please continue to refer to Fig. 9 In the step of coating the insulating material on the negative electrode active material a2 to form the insulating layer b, a marking point d is dotted outside the center line of each second insulating portion b2.

[0115] In the step of cutting the material to be cut along the center line of each second insulating portion b2, the material to be cut is cut according to each marking point d.

[0116] By marking a marking point d on the outside of the center line of each second insulating portion b2, the position of the center line of each second insulating portion b2 can be marked to facilitate the subsequent cutting work of the cutting device.

[0117] According to some embodiments of the present application, see Figures 2 to 6 The present application provides a battery 100, wherein a housing 10 includes a plurality of battery cells 20, and the plurality of battery cells 20 are arranged in a matrix. The battery cell 20 includes a housing 21 and an electrode assembly 22 disposed in the housing 21, and the electrode assembly 22 includes a negative electrode sheet 221 and a positive electrode sheet 222, and the negative electrode sheet 221 and the positive electrode sheet 222 are stacked along a first direction. The negative electrode sheet 221 includes a negative electrode current collector 2211, a negative electrode active material layer 2212 coated on both side surfaces of the negative electrode current collector 2211 along the first direction, and a solid electrolyte layer 2213 coated on each negative electrode active material layer 2212.

[0118] An annular support member 223 is disposed on the edge of each negative electrode active material layer 2212 facing the solid electrolyte layer 2213 . The support member 223 is made of insulating material and is disposed around the edge of the negative electrode active material layer 2212 .

[0119] Along the first direction, each support member 223 is located between each negative electrode active material layer 2212 and an adjacent solid electrolyte layer 2213 .

[0120] The positive electrode sheet 222 includes a positive current collector 2221 and a positive active material layer 2222 coated on both side surfaces of the positive current collector 2221 along a first direction.

[0121] 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, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the 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 negative electrode sheet and a positive electrode sheet, the negative electrode sheet and the positive electrode sheet are stacked along a first direction; the negative electrode sheet comprises a negative electrode current collector, a negative electrode active material layer coated on at least one side of the negative electrode current collector along the first direction, and a solid electrolyte layer coated on the negative electrode active material layer; A support is provided on the edge of the negative electrode active material layer facing the solid electrolyte layer, and the support is made of insulating material; along the first direction, the support is located between the negative electrode active material layer and the solid electrolyte layer.

2. The battery cell according to claim 1, characterized in that: The solid electrolyte layer includes an edge region and a center region; along the first direction, the center region is adjacent to the negative electrode active material layer, the support member is located between the negative electrode active material layer and the edge region, and the side of the edge region facing away from the negative electrode current collector is flush with the side of the center region facing away from the negative electrode current collector.

3. The battery cell according to claim 1, characterized in that: The support member is annular and is arranged around the edge of the negative electrode active material layer.

4. The battery cell according to claim 3, characterized in that: The outer edge of the negative electrode active material layer, the outer edge of the solid electrolyte layer and the outer edge of the support are all flush with the outer edge of the negative electrode current collector.

5. The battery cell according to claim 1, characterized in that: Both side surfaces of the negative electrode current collector along the first direction are coated with the negative electrode active material layer, and the side surface of each negative electrode active material layer facing away from the negative electrode current collector is coated with the solid electrolyte layer.

6. The battery cell according to claim 1, characterized in that: The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer coated on both side surfaces of the positive electrode collector along the first direction.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The support member is made of UV insulating glue.

8. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 7.

9. An electrical device, characterized in that: The method comprises a battery cell as claimed in any one of claims 1 to 7, or a battery as claimed in claim 8.

10. A battery processing device, characterized in that: Suitable for processing the electrode assembly of the battery monomer according to any one of claims 1 to 7, the battery processing equipment comprises a feeding device, a first coating device, a second coating device and a cutting device, the feeding device is used to provide a substrate, the substrate comprises a current collector layer and a negative electrode active material coated on at least one side of the current collector layer; The first coating device is used to coat the insulating material on the negative electrode active material to form an insulating layer; the insulating layer includes two first insulating parts respectively arranged along the two long sides of the substrate, and a plurality of second insulating parts spaced apart between the two first insulating parts; The second coating device is used to coat the electrolyte material on the negative electrode active material exposed on the insulating material and the insulating material to form a material to be cut; The cutting device is used to cut the material to be cut along the center line of each second insulating portion to form the negative electrode sheet provided with a support member composed of the insulating material and a solid electrolyte layer composed of the electrolyte material.

11. The battery processing equipment according to claim 10, characterized in that: The feeding device comprises a feeding roller, and the substrate is wound around the feeding roller.

12. The battery processing equipment according to claim 10, characterized in that: The first coating device includes a coating mechanism and a curing mechanism. The coating mechanism is used to coat the insulating material on the negative electrode active material. The curing mechanism is used to cure the insulating material coated on the negative electrode active material to form the insulating layer.

13. The battery processing equipment according to claim 12, characterized in that: The coating mechanism is used for coating the insulating material by screen printing or spraying.

14. The battery processing equipment according to claim 10, characterized in that: The first coating device is also used to apply marking points on the outside of the center line of each of the second insulating parts; The cutting device is used to cut the material to be cut according to each of the marking points.

15. A battery processing method, characterized in that: Suitable for processing the electrode assembly of the battery cell according to any one of claims 1 to 7, the battery processing method comprising: Providing a substrate; wherein the substrate comprises a current collector layer and a negative electrode active material coated on at least one side surface of the current collector layer; An insulating material is coated on the negative electrode active material to form an insulating layer; the insulating layer comprises two first insulating portions respectively arranged along the two long sides of the substrate, and a plurality of second insulating portions spaced apart between the two first insulating portions; Coating an electrolyte material on the negative electrode active material exposed from the insulating material and the insulating material to form a material to be cut; Cutting the material to be cut along the center line of each second insulating portion to form the negative electrode sheet provided with a support member made of the insulating material and a solid electrolyte layer made of the electrolyte material; preparing a positive electrode sheet; The negative electrode sheet and the positive electrode sheet are stacked to form an electrode assembly.

16. The battery processing method according to claim 15, characterized in that: In the step of coating the insulating material on the negative electrode active material to form the insulating layer, the insulating material is coated by screen printing or spraying.

17. The battery processing method according to claim 15, characterized in that: In the step of coating the insulating material on the negative electrode active material to form the insulating layer, marking points are dotted outside the center line of each of the second insulating portions; In the step of cutting the material to be cut along the center line of each second insulating portion, the material to be cut is cut according to each marking point.

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