Preparation equipment and preparation method of electrode plate, electrode plate and battery

Abstract

The embodiment of the invention provides preparation equipment and a preparation method of an electrode plate, the electrode plate and a battery, and relates to the technical field of batteries, and the electrode plate comprises a current collector and a diaphragm arranged on the surface of the current collector along the extension direction of the current collector. The preparation equipment of the electrode plate comprises a diaphragm feeding mechanism for conveying a diaphragm to a composite roller, a current collector feeding mechanism for outputting a current collector to the composite roller, the composite roller for compositing the diaphragm and the current collector to obtain the electrode plate, die cutting equipment for performing die cutting on the electrode plate, and a driving mechanism arranged on a walking belt and used for driving the composite roller to rotate, and the air knife is positioned between the die cutting equipment and the winding device and is used for blowing off a diaphragm in a spacer region on the electrode plate. The electrode slice with the periodically interrupted dressing layer is obtained through the preparation equipment of the electrode slice, the preparation efficiency of the electrode slice with the periodically interrupted dressing layer is improved, the material waste is reduced, and the production cost is reduced.

Description

Technical Field

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

[0002] As an innovative electrode preparation technology, electrode sheet fabrication represents the future direction of battery manufacturing. Its application and promotion will help promote technological upgrades and innovative development across the battery industry, playing a vital supporting role in the development of electric vehicles, energy storage, and other fields.

[0003] In practical applications, in response to the special needs of the battery cell structure, such as in some battery cell structures that need to optimize the internal space layout of the battery cell, improve heat dissipation performance, or achieve specific electrochemical performance, the electrode sheet with a periodic discontinuity in the dressing layer can better meet the design requirements. The existing equipment for preparing electrode sheets with periodic discontinuity in the dressing layer periodically feeds the material to the feeding mechanism through the diaphragm feeding mechanism, while the current collector feeding structure continuously feeds the composite mechanism, so that the diaphragm on the electrode sheet processed by the composite mechanism is periodically discontinuous. However, the mechanical characteristics of this preparation equipment make the efficiency of preparing electrode sheets low, which cannot meet the needs of efficient and large-scale production.

[0004] Therefore, providing a technical solution that can improve the preparation efficiency of electrode sheets with periodic discontinuous dressing layers is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The embodiments of the present application provide an electrode sheet preparation device, a preparation method, an electrode sheet and a battery, which are used to improve the efficiency of preparing electrode sheets with periodic discontinuous dressing layers, and further meet the needs of efficient and large-scale production.

[0006] In a first aspect, an embodiment of the present application provides an apparatus for preparing an electrode sheet, the electrode sheet comprising a current collector and a membrane arranged on a surface of the current collector along an extension direction of the current collector, the apparatus comprising:

[0007] A film feeding mechanism, used for conveying the film to the composite roller;

[0008] A current collector feeding mechanism, used for outputting the current collector to the composite roller;

[0009] The composite roller is used to composite the membrane and the current collector to obtain an electrode sheet;

[0010] A die-cutting device, provided on the conveyor belt between the composite roller and the winding device, for die-cutting the electrode sheet;

[0011] The air knife is arranged on the conveyor belt and located between the die-cutting device and the winding device, and is used to blow off the diaphragm in the spacer area on the electrode sheet, so as to obtain an electrode sheet with a periodically interrupted dressing layer.

[0012] In a possible implementation manner, the number of the diaphragm feeding mechanisms is one or two, and the number of the diaphragm feeding structures is the same as the number of the air knives.

[0013] In a possible implementation manner, when the number of the diaphragm feeding mechanisms and the number of the air knives are two, the two diaphragm feeding mechanisms are symmetrically arranged on both sides of the composite roller, and the two air knives are respectively arranged on both sides of the conveyor belt.

[0014] In a possible implementation manner, the die-cutting device includes at least two groups of die-cutting units;

[0015] The at least two groups of die-cutting units are sequentially arranged on the conveyor belt, and the die-cutting speed of each die-cutting unit is consistent with the speed of the electrode sheet on the conveyor belt.

[0016] In a possible implementation manner, the diaphragm feeding mechanism includes a feeding device and a film-forming roller;

[0017] The feeding device is used to convey the dry material to the film-forming roller;

[0018] The film-forming roller is used to perform film-forming treatment on the dry material to obtain a diaphragm, and convey the diaphragm to the composite roller.

[0019] In a possible implementation manner, the film-forming roller includes at least two laminating rollers, and the last laminating roller among the at least two laminating rollers and the composite roller jointly perform roller pressing and lamination on the diaphragm and the current collector.

[0020] In a second aspect, an embodiment of the present application provides a method for preparing an electrode sheet, which is applied to the electrode sheet preparation device according to any possible implementation manner in the first aspect. The method includes:

[0021] Controlling the current collector feeding mechanism to convey the current collector to the composite roller;

[0022] Controlling the diaphragm feeding mechanism to convey the diaphragm to the composite roller;

[0023] Controlling the composite roller to perform roller pressing and lamination on the current collector and the diaphragm to obtain an electrode sheet;

[0024] Controlling the die-cutting device to perform die-cutting on the dressing area and the spacer area of the diaphragm in the electrode sheet;

[0025] Controlling the air knife to blow off the diaphragm in the spacer area on the die-cut electrode sheet, so as to obtain an electrode sheet with a periodically interrupted dressing layer.

[0026] In a possible implementation, controlling the composite roller to perform roller compressing and laminating on the current collector and the diaphragm includes:

[0027] Controlling the composite roller to apply pressure and release pressure respectively according to a preset pressure application time interval and pressure release time interval, so as to perform roller compressing and laminating on the current collector and the diaphragm.

[0028] In a third aspect, an electrode sheet provided by an embodiment of the present application is obtained by the preparation device of the electrode sheet according to any possible one of the first aspect, and / or, the preparation method of the electrode sheet according to any possible one of the second aspect.

[0029] In a fourth aspect, an embodiment of the present application provides a control device, including: a memory, a processor;

[0030] The memory stores computer execution instructions;

[0031] The processor executes the computer execution instructions stored in the memory, so that the processor executes the above second aspect and / or various possible implementation manners of the second aspect.

[0032] In a fifth aspect, an embodiment of the present application provides a battery, including the electrode sheet described in the third aspect.

[0033] A preparation device, a preparation method, an electrode sheet and a battery of an electrode sheet provided by an embodiment of the present application. The electrode sheet includes a current collector and a diaphragm arranged on the surface of the current collector along the extension direction of the current collector. The preparation device of the electrode sheet includes a diaphragm feeding mechanism for feeding the diaphragm to a composite roller, a current collector feeding mechanism for outputting the current collector to the composite roller, a composite roller for laminating the diaphragm and the current collector to obtain the electrode sheet, a die-cutting device for die-cutting the electrode sheet, and an air knife arranged on a running belt and located between the die-cutting device and a winding device for blowing off the diaphragm in the spacer area of the electrode sheet. Through the preparation device of the electrode sheet, an electrode sheet with a periodically interrupted dressing layer is obtained, and at the same time, the preparation efficiency of the electrode sheet with a periodically interrupted dressing layer is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0035] Figure 1 Structural schematic of a preparation device of an electrode sheet provided by the present application Figure 1 ;

[0036] FIG. 2(a) is a second structural schematic diagram of a preparation device of an electrode sheet provided by the present application;

[0037] Figure 2(b) is a schematic structural diagram of a preparation device for an electrode sheet provided by the present application Figure 3 ;

[0038] Figure 3 is a schematic flow chart of a preparation method for an electrode sheet provided by the present application;

[0039] Figure 4(a) is a top view of an electrode sheet provided by the present application;

[0040] Figure 4(b) is a cross-section of an electrode sheet provided by the present application Figure 1 ;

[0041] Figure 4(c) is a second cross-sectional view of an electrode sheet provided by the present application;

[0042] Figure 5 is a schematic structural diagram of a control device provided by the present application.

[0043] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0044] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] First, the application background of the present application is explained as follows:

[0046] With the rapid development of renewable energy and electric vehicles, the demand for high-performance batteries is increasing day by day. As the core component of the battery, the performance of the electrode sheet directly affects the capacity, life, and safety of the battery. Preparing high-quality electrode sheets can not only improve the energy density and cycle life of the battery but also reduce costs, meeting the market's demand for efficient, reliable, and economical energy storage solutions.

[0047] The existing method for preparing electrode sheets generally includes mixing active materials, conductive agents, binders and other materials, forming the mixture into a fibrous structure through mechanical or physical methods, and then evenly spreading the fiberized mixture on the substrate to form a continuous dressing layer. Finally, the dressing layer is tightly combined with the substrate to form a stable electrode sheet. During the continuous tape-feeding process, the dressing layer on the electrode sheet is usually continuous, but in actual applications, in response to the special requirements of the battery cell structure, such as in some battery cell structures that need to optimize the internal space layout of the battery cell, improve heat dissipation performance or achieve specific electrochemical performance, the electrode sheet with a periodic discontinuous dressing layer can better meet the design requirements. The existing equipment for preparing electrode sheets with periodic discontinuous dressing layers uses a diaphragm feeding mechanism to periodically feed the feeding mechanism, while the current collector feeding mechanism continuously feeds the composite mechanism, so that the diaphragm on the electrode sheet processed by the composite mechanism is periodically discontinuous. However, the mechanical characteristics of this preparation equipment make the efficiency of preparing electrode sheets low, which cannot meet the needs of efficient and large-scale production.

[0048] Therefore, providing a technical solution that can improve the preparation efficiency of electrode sheets with periodic discontinuous dressing layers is a technical problem that needs to be solved urgently.

[0049] Based on the above technical problems, the inventors, in the process of studying the preparation equipment and preparation method of electrode sheets with periodic interruptions in the dressing layer, found that the coordinated work of the diaphragm feeding mechanism, the current collector feeding mechanism, the composite roller, the die-cutting equipment and the air knife can significantly improve the preparation efficiency. Specifically, by accurately controlling the pressure cycle and the pressure relief cycle of the composite roller, the periodic compounding of the diaphragm and the current collector can be achieved; the combination of the die-cutting equipment and the air knife can be used to accurately remove the diaphragm in the spacing area and optimize the dressing area. Not only can it improve the preparation efficiency of electrode sheets with periodic interruptions in the dressing layer, it also reduces material waste and reduces production costs, thereby effectively solving the deficiencies in the prior art. Based on this, the present application provides an electrode sheet preparation equipment, a preparation method, an electrode sheet and a battery.

[0050] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0051] Figure 1 A schematic diagram of the structure of an electrode sheet preparation device provided in this application Figure 1 ,like Figure 1 As shown, the preparation equipment includes:

[0052] The film feeding mechanism is used to convey the film to the composite roller.

[0053] The electrode sheet includes a current collector and a diaphragm arranged on the surface of the current collector along the extending direction of the current collector. The diaphragm feeding mechanism is used to output the diaphragm during the preparation of the electrode sheet. The diaphragm is used to act as an isolation layer between the positive electrode and the negative electrode in the battery to prevent the positive electrode and the negative electrode from contacting to avoid short circuit. The diaphragm has a microporous structure that allows electrolyte ions to pass through, thereby supporting the progress of the electrochemical reaction.

[0054] A current collector feeding mechanism for outputting the current collector to the composite roller.

[0055] The current collector feeding mechanism is used to output the current collector during the preparation of the electrode sheet. The current collector is used to conduct current in the battery, effectively collect and transmit the current generated by the active material to the external circuit. In addition, the current collector also provides mechanical support, helps maintain the integrity of the electrode structure, and promotes good contact between the electrode material and the electrolyte, thereby improving the overall performance and lifespan of the battery.

[0056] The composite roller is used to composite the diaphragm and the current collector to obtain the electrode sheet.

[0057] The composite roller is used to receive the diaphragm from the diaphragm feeding mechanism and receive the current collector from the current collector feeding mechanism, and roll and composite the diaphragm and the current collector to obtain the electrode sheet. Among them, the composite roller rolling and composite methods mainly include hot roll lamination, cold roll lamination, dry roll lamination, wet roll lamination, and vacuum roll lamination, etc.

[0058] Specifically, the composite roller is a roller that can control the application or removal of pressure, and periodically applies or removes pressure through an electric cylinder. When the composite roller is in the pressure application state, the diaphragm is composite to the current collector, and the pressure causes the diaphragm to physically combine or bond with the surface of the current collector at the micro level, thereby achieving a firm composite and forming a bonding area between the diaphragm and the current collector, that is, the dressing area. When the composite roller is in the pressure relief state, due to the lack of sufficient pressure, the diaphragm and the current collector remain separated, and the diaphragm is not composite to the current collector, forming an unbonded area between the diaphragm and the current collector, that is, the spacer area. For example, the composite roller is periodically operated through an electric cylinder, where the pressure application lasts for 3 seconds and then the pressure is relieved for 1 second. By precisely controlling the pressure application time interval and the pressure relief time interval, an electrode sheet with a fixed length of dressing area and spacer area can be obtained, meeting the requirements of an electrode sheet with periodic interruption of the dressing layer in a specific battery design, thereby optimizing the battery performance.

[0059] A die-cutting device is arranged on the conveyor belt between the composite roller and the winding device for die-cutting the electrode sheet.

[0060] The tape running refers to a belt conveyor device used to transport materials on the production line, ensuring the smooth movement of the electrode sheets at each processing stage. The winding device is used to wind the processed electrode sheets into rolls for subsequent storage, transportation, and handling. The die-cutting device is arranged on the tape running between the compounding roller and the winding device, and is used to die-cut the interface between the dressing area and the spacer area of the electrode sheet, precisely cutting off the spacer area of the electrode sheet. Among them, the die-cutting depth is the thickness of the film sheet, so the current collector will not be damaged. Through the die-cutting device, the effective dressing area of the electrode sheet is optimized, thereby improving the performance and consistency of the battery.

[0061] The air knife is arranged on the tape running and is located between the die-cutting device and the winding device, and is used to blow off the film sheet in the spacer area of the electrode sheet to obtain an electrode sheet with periodically interrupted dressing layers.

[0062] The air knife is a device that uses high-speed air flow to remove or dry the surface of materials. Through the strong air flow, the film sheet in the spacer area of the electrode sheet cut by the die-cutting device on the electrode sheet is blown off. Ensure that only the dressing area is retained, thereby obtaining an electrode sheet with periodically interrupted dressing layers. In addition, the spacer area film sheets blown off by the air knife can be collected, granulated and reused, improving the utilization rate of materials, reducing waste in the production process, and reducing production costs.

[0063] A preparation device for an electrode sheet provided by an embodiment of the present application includes a film sheet feeding mechanism, a current collector feeding mechanism, a compounding roller, a die-cutting device, an air knife, and a winding device. The film sheet feeding mechanism is used to transport the film sheet to the compounding roller, the current collector feeding mechanism is used to transport the current collector to the compounding roller, and the compounding roller is periodically pressurized and depressurized through an electric cylinder to compound the film sheet and the current collector into an electrode sheet including a dressing area and a spacer area. The die-cutting device is arranged on the tape running between the compounding roller and the winding device, precisely cutting off the film sheet in the spacer area of the electrode sheet and optimizing the effective dressing area of the electrode sheet. The air knife is located between the die-cutting device and the winding device, blowing off the spacer area film sheets through high-speed air flow and allowing them to be collected and reused. Through this preparation device for the electrode sheet, the preparation efficiency of the electrode sheet with periodically interrupted dressing layers is improved, and the prepared electrode sheet with periodically interrupted dressing layers can meet the specific battery design requirements, optimizing the performance and service life of the battery.

[0064] Based on the Figure 1 embodiment, the film sheet feeding mechanism in the preparation device for the electrode sheet specifically includes:

[0065] In a possible implementation manner, the film sheet feeding mechanism includes a feeding device and a film forming roller. The feeding device is used to transport the dry material to the film forming roller, and the film forming roller is used to perform film forming treatment on the dry material to obtain a film sheet and transport the film sheet to the compounding roller.

[0066] Dry materials usually refer to materials in the form of powders or granules that do not contain liquid components or solvents. During the preparation of electrode sheets, dry materials are prepared by mixing active substances, conductive agents, and binders using mixing equipment such as high-speed dispersers and performing preliminary fibrillation. When the active substance is the positive electrode, the prepared dry material is the positive electrode, and further the prepared electrode sheet is the positive electrode sheet; when the active substance is the negative electrode, the prepared dry material is the negative electrode, and further the prepared electrode sheet is the negative electrode sheet. In addition, if the prepared electrode sheet is used in a all-solid-state battery, a solid electrolyte also needs to be added. The feeding device is used to transport the dry material to the film-forming roller, and it can be a screw feeder, a vibrating feeder, a gravity feeder, etc.

[0067] The film-forming roller is a device used to process dry materials into films. It usually consists of one or more rollers. By applying pressure and controlling the temperature between the rollers, the dry material transported by the feeding device is pressed into a uniform film, and the obtained film sheet is transported to the compounding roller.

[0068] In a possible implementation manner, the film-forming roller includes at least two laminating rollers, and the last laminating roller among the at least two laminating rollers and the compounding roller jointly perform roller pressing and compounding on the film sheet and the current collector.

[0069] By adjusting the spacing, pressure, and temperature between at least two laminating rollers in the film-forming roller, the film-forming roller can precisely control the thickness and density of the film sheet. For example, if a thinner film sheet needs to be prepared, the dry material is passed through the laminating rollers in the film-forming roller multiple times. Each laminating roller will apply a certain pressure and temperature to the material, thereby gradually compressing and shaping the material to make it reach the required thinness. That is, by increasing the number of times passing through the laminating rollers, the thickness and uniformity of the film sheet can be precisely controlled. On the contrary, if a thinner film sheet does not need to be prepared, the number of times the dry material passes through the laminating rollers is reduced to improve production efficiency.

[0070] Subsequently, the film-forming roller transports the obtained film sheet to the compounding roller. The compounding roller performs roller pressing and compounding on the film sheet and the current collector transported by the current collector feeding mechanism, that is, by periodically applying pressure or releasing pressure, a bonding area between the film sheet and the current collector, that is, the dressing area, and a non-bonding area between the film sheet and the current collector, that is, the spacing area, are formed. By precisely controlling the pressure application interval and pressure release interval of the compounding roller, an electrode sheet with a fixed length of dressing area and spacing area can be obtained, thereby meeting the specific battery design requirements and improving production efficiency.

[0071] In a possible implementation manner, the die-cutting equipment includes at least two groups of die-cutting devices. The die-cutting devices are sequentially arranged on the conveyor belt, and the die-cutting speed of each die-cutting device is the same as the speed of the electrode sheet on the conveyor belt.

[0072] Such as Figure 1As described in the embodiments, the die-cutting device is arranged on the running belt between the compound roller and the winding device and is used for die-cutting the electrode sheet. Among them, the die-cutting device includes at least two groups of die-cutting devices arranged in sequence on the running belt, and the die-cutting speed of each die-cutting device is consistent with the speed of the electrode sheet on the running belt, thereby forming a cyclic working process to ensure that each interval area on the electrode sheet can be accurately cut off, improving the overall efficiency of the production line and the consistency of the electrode sheet.

[0073] Figure 2(a) is a second schematic structural diagram of a preparation device for an electrode sheet provided by the present application, and Figure 2(b) is a schematic structural diagram of a preparation device for an electrode sheet provided by the present application. Figure 3 In this embodiment Figure 1 On the basis of the embodiments, the structure of the preparation device for the electrode sheet is described in detail as follows:

[0074] In a possible implementation manner, the number of diaphragm feeding mechanisms is one or two, and the number of diaphragm feeding mechanisms is the same as the number of air knives.

[0075] When the number of diaphragm feeding mechanisms is one, that is, when the number of feeding devices and film-forming rollers is one group, the number of air knives is also one. At this time, the preparation device for the electrode sheet is a preparation device for a single-sided electrode sheet, and the prepared electrode sheet is a single-sided electrode sheet with periodically interrupted dressing layers.

[0076] The schematic structural diagram of the preparation device 20 for the single-sided electrode sheet is shown in Figure 2(a), and the specific working process is as follows:

[0077] The dry materials are transported to the first roll gap of the film-forming roller 202 through the feeding device 201 to complete preliminary film formation. After one or more thinning processes, a film sheet with a target thickness and a target surface density is obtained. The film-forming roller 202 transports the film sheet to the compound roller 203. The collector feeding mechanism, that is, the unwinding roller 204, transports the collector to the compound roller 203. When the last laminating roller of the film-forming roller 202 and the roll gap of the compound roller 203 jointly roll-press and compound the film sheet and the collector, the compound roller 203 periodically applies or removes pressure through the electric cylinder to obtain an electrode sheet with fixed-length dressing areas and interval areas. The electrode sheet runs to the die-cutting device 205, and the die-cutting device 205 die-cuts the interface between the dressing area and the interval area of the electrode sheet to accurately cut off the interval area of the electrode sheet. Among them, the die-cutting device 205 includes a first die-cutting device 205-1 and a second die-cutting device 205-2, and the die-cutting speeds of the first die-cutting device 205-1 and the second die-cutting device 205-2 are consistent with the speed of the electrode sheet on the running belt. The electrode sheet continues to run to the air knife 206, and the air knife 206 blows off the film sheet in the interval area on the electrode sheet to obtain a single-sided electrode sheet with periodically interrupted dressing layers. The winding device 207 winds the single-sided electrode sheet with periodically interrupted dressing layers into a roll for subsequent storage, transportation, and processing.

[0078] In a possible implementation, when the number of diaphragm feeding mechanisms and the number of air knives are two, the two diaphragm feeding mechanisms are symmetrically arranged on both sides of the composite roller, and the two air knives are respectively arranged on both sides of the running belt.

[0079] When the number of diaphragm feeding mechanisms is two, that is, when the number of feeding devices and film-forming rollers is two groups, the number of air knives is also two. At this time, the preparation equipment for the electrode sheet is the preparation equipment for double-sided electrode sheets, and the prepared electrode sheet is a double-sided electrode sheet with periodically interrupted dressing layers.

[0080] The structural schematic diagram of the preparation equipment 21 for the double-sided electrode sheet is shown in Fig. 2(b). The two diaphragm feeding mechanisms are arranged on both sides of the composite roller, and the two air knives are respectively arranged on both sides of the running belt. The working principle of the preparation equipment 21 for the double-sided electrode sheet is similar to that of the preparation equipment 20 for the single-sided electrode sheet. The specific working process is as follows:

[0081] The dry material is transported to the first roll gap of the film-forming roller 212-1 through the feeding device 211-1 to complete preliminary film formation. After one or more thinning processes, a film sheet with the target thickness and target surface density is obtained. The film-forming roller 212-1 transports the film sheet to the composite roller 213. On the other side, the dry material is transported to the first roll gap of the film-forming roller 212-2 through the feeding device 211-2 to complete preliminary film formation. After one or more thinning processes, a film sheet with the target thickness and target surface density is obtained. The film-forming roller 212-2 transports the film sheet to the composite roller 213. The current collector feeding mechanism, that is, the unwind roller 214 transports the current collector to the composite roller 213. When the film sheets on both sides and the current collector pass through the roll gap of the composite roller 213 together, the composite roller 213 periodically applies pressure or releases pressure through the electric cylinder to obtain an electrode sheet with fixed-length dressing areas and interval areas. The electrode sheet runs to the transfer roller 215. After the transfer roller 215 adjusts the direction of the electrode sheet, it continues to run to the die-cutting device 216. The die-cutting device 216 simultaneously die-cuts the interfaces of the dressing areas and interval areas on both sides of the electrode sheet to accurately cut off the interval areas of the electrode sheet. Among them, the die-cutting device 216 includes a first die-cutting device 216-1 and a second die-cutting device 216-2. The die-cutting speeds of the first die-cutting device 216-1 and the second die-cutting device 216-2 are the same as the speed of the electrode sheet on the running belt. The electrode sheet continues to run to the air knife 217. The air knife 217 simultaneously blows off the film sheets in the interval areas on both sides of the electrode sheet to obtain a double-sided electrode sheet with periodically interrupted dressing layers. The winding device 218 winds the double-sided electrode sheet with periodically interrupted dressing layers into a roll for subsequent storage, transportation, and processing.

[0082] An electrode sheet preparation device provided by an embodiment of the present application can produce a single-sided electrode sheet with periodically interrupted dressing layers and a double-sided electrode sheet with periodically interrupted dressing layers. In the preparation device for the single-sided electrode sheet, the dry materials are formed into a film through a single feeding device and a film-forming roller, and the film and the current collector are periodically laminated on a lamination roller to form an electrode sheet. The die-cutting device precisely cuts off the film in the spacer area of the electrode sheet, and the air knife blows off the film in the spacer area of the electrode sheet to obtain a single-sided electrode sheet with periodically interrupted dressing layers. The working principle of the preparation device for the double-sided electrode sheet is similar to that of the preparation device for the single-sided electrode sheet. Through this electrode sheet preparation device, an electrode sheet with periodically interrupted dressing layers is obtained, which further optimizes the performance of the battery and improves the preparation efficiency of the electrode sheet with periodically interrupted dressing layers at the same time.

[0083] Figure 3 It is a schematic flowchart of a method for preparing an electrode sheet provided by the present application, which is applied to the electrode sheet preparation device described in the above embodiment. Combining with the preparation device for the single-sided electrode sheet described in the embodiment of FIG. 2(a), as Figure 3 shown, the method includes:

[0084] S301: Control the current collector feeding mechanism to transport the current collector to the lamination roller.

[0085] Specifically, the control device controls the current collector feeding mechanism, that is, the unwinding roller 204, to transport the current collector to the lamination roller 203 to provide a raw material basis for preparing the electrode sheet.

[0086] S302: Control the film feeding mechanism to transport the film to the lamination roller.

[0087] Specifically, the control device controls the dry materials to be transported through the feeding device 201 to the first roller gap of the film-forming roller 202 to complete preliminary film formation. After one or more thinning processes, a film with a target thickness and a target surface density is obtained. The film-forming roller 202 transports the film to the lamination roller 203 to provide a raw material basis for preparing the electrode sheet.

[0088] S303: Control the lamination roller to roll and laminate the current collector and the film to obtain an electrode sheet.

[0089] In this step, when the last laminating roller of the film-forming roller 202 and the roller gap of the lamination roller 203 jointly roll and laminate the film and the current collector, the control device controls the lamination roller 203 to apply pressure and release pressure respectively according to a preset pressure application time interval and pressure release time interval to roll and laminate the current collector and the film.

[0090] Specifically, the control device controls the composite roller 203 to periodically apply pressure or relieve pressure through an electric cylinder. For example, it first applies pressure for 3 seconds and then relieves pressure for 1 second, and cyclically repeats this roll pressing and compounding operation until an electrode sheet with a fixed-length dressing area and spacer area is obtained, meeting the requirements for an electrode sheet with periodically intermittent dressing layers in a specific battery design, thereby optimizing the battery performance.

[0091] S304: Control the die-cutting device to die-cut the dressing area and spacer area of the diaphragm in the electrode sheet.

[0092] Specifically, the die-cutting device 205 die-cuts the interface between the dressing area and spacer area of the electrode sheet, precisely cutting off the spacer area of the electrode sheet. The die-cutting depth is the thickness of the diaphragm, so the current collector will not be damaged. Through the die-cutting device 205, the spacer area on the electrode sheet can be effectively removed, optimizing the effective dressing area of the electrode sheet.

[0093] S305: Control the air knife to blow off the diaphragm in the spacer area on the die-cut electrode sheet to obtain an electrode sheet with periodically intermittent dressing layers.

[0094] Specifically, the air knife 206 blows off the diaphragm in the spacer area on the electrode sheet to obtain an electrode sheet with periodically intermittent dressing layers. In addition, the spacer area diaphragms blown off by the air knife can be collected, granulated, and reused, improving the material utilization rate and reducing the production cost.

[0095] A method for preparing an electrode sheet provided by an embodiment of the present application provides a raw material basis for the preparation of the electrode sheet by transporting the current collector and the diaphragm to the composite roller through the feeding mechanism respectively. Under the action of the composite roller, the current collector and the diaphragm are roll-pressed and compounded to form an electrode sheet with a dressing area and a spacer area. By controlling the pressure application time interval and pressure relief time interval of the composite roller, the periodic intermittence of the dressing layer is achieved, meeting the requirements of a specific battery design. Subsequently, the die-cutting device precisely die-cuts the dressing area and spacer area of the electrode sheet, removing the spacer area without damaging the current collector, and optimizing the effective dressing area of the electrode sheet. Finally, the air knife blows off the die-cut spacer area diaphragms and collects these diaphragms for reuse, improving the material utilization rate and reducing the production cost. Through the above method, the preparation efficiency of the electrode sheet with periodically intermittent dressing layers is improved. The prepared electrode sheet with periodically intermittent dressing layers can meet the requirements of a specific battery design, and at the same time, a more economical production process is realized.

[0096] On the basis of the above embodiments, during the preparation process of the electrode sheet, the positive / negative active materials, conductive agents, and binders are mixed and processed using a mixing device such as a high-speed disperser, and preliminary fibrillation is carried out to prepare the positive / negative dry materials.

[0097] Among them, the positive electrode active materials include lithium nickel cobalt aluminum oxide, lithium nickel cobalt manganese oxide, LiFePO4, LiFe 0.2 Mn 0.8 PO4, LiMn2O4, LiCoPO4, LiNiO2, LiNi 0.5 Mn 1.5 At least one of O4, LiCoO2, LiTiS2, LiNiO2, elemental sulfur, and a sulfur-carbon mixture.

[0098] The negative electrode active material includes at least one of graphite, silicon, silicon oxide, graphene, soft carbon, and hard carbon.

[0099] The conductive agent includes at least one of Super P, VGCF, carbon nanotubes, acetylene black, Ketjen black, and conductive graphene.

[0100] The binder includes at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyimide (PI), polyacrylonitrile (PAN), polypropylene (PP), polyethylene (PE), and polystyrene (PS).

[0101] In addition, if the prepared electrode sheet is used in an all-solid-state battery, a solid electrolyte must be added. Solid electrolytes include sulfide solid electrolytes, oxide solid electrolytes, and halide electrolytes.

[0102] Among them, sulfide electrolytes include Li 10 GeP2S 12 、Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 、Li 9.6 P3S 12 、Li 7- y PS 6-y X y 、Li 1.4 Al 0.4 Ti 1.6 At least one of (PO4)3, wherein X is selected from any one of Cl, Br or I, and the value range of y is 0.8≤y≤2.0.

[0103] Oxide solid electrolytes include Li 7-x La3Zr 2-x Ta x O 12 、Li 7-2y La3Zr 2-y W y O 12 、Li7-z La3Zr 2- z Nb z O 12 、Li7La3Zr2O 12 、Li 1+m Al m Ti 2-m (PO4)3, LiPON and Li 1+n Al n Ge 2-n (PO4)3, where 0.2 < x < 2, 0.2 < y < 2, 0.2 < z <2, 0.2 < m < 2, 0.2 < n < 2.

[0104] The halide solid electrolyte includes at least one of Li3YCl6, Li3ErCl6, Li3YBr6, Li3InBr6 and Li3InCl6.

[0105] Furthermore, the positive electrode material is coated with a nano - coating layer, and the nano - coating layer includes at least one of Li3PO4, Al2O3, LiNbO3, LiAlO2, Li3BO3, Li2OZrO2, MgO, HfO2, Li2SiO3, B2O3, Li2O, Nb2O5, P2O5, SiO2, Sc2O3, TiO2, ZrO2.

[0106] Figure 4(a) is a top view of an electrode sheet provided by this application, and Figure 4(b) is a cross - section of an electrode sheet provided by this application Figure 1 , Figure 4(c) is the second cross - sectional view of an electrode sheet provided by this application. On the basis of the above - mentioned embodiments, the electrode sheet provided by this application is made by Figure 1 the preparation equipment of the electrode sheet described in the embodiment or Figure 2(a) or Figure 2(b), and / or is made by Figure 3 the preparation method of the electrode sheet described in the embodiment.

[0107] In practical applications, the preparation equipment of the electrode sheet is usually configured with a vision recognition system, a thickness monitoring system, a surface density monitoring system, a tension control system, etc., to ensure the quality and consistency of the electrode sheet made by this preparation equipment. Through Figure 1The top view of the electrode sheet prepared by the preparation device of the electrode sheet described in the embodiment is shown in Fig. 4(a). This electrode sheet may be a single-sided electrode sheet or a double-sided electrode sheet. Specifically, the cross-sectional view of the single-sided electrode sheet prepared by the single-sided electrode sheet preparation device 20 described in the embodiment of Fig. 2(a) is shown in Fig. 4(b), and the cross-sectional view of the double-sided electrode sheet prepared by the double-sided electrode sheet preparation device 21 described in the embodiment of Fig. 2(b) is shown in Fig. 4(c). Among them, in Fig. 4(a), Fig. 4(b), and Fig. 4(c), 401 all represents the positive / negative current collector, and 402 all represents the positive / negative dressing layer.

[0108] Figure 5 The structural schematic diagram of a control device provided by this application. As Figure 5 shown, the control device 50 provided in this embodiment includes: at least one processor 501 and a memory 502. Optionally, the control device 50 further includes a communication component 503. Among them, the processor 501, the memory 502, and the communication component 503 are connected through a bus 504.

[0109] In the specific implementation process, at least one processor 501 executes the computer execution instructions stored in the memory 502, so that at least one processor 501 executes the above method.

[0110] For the specific implementation process of the processor 501, reference can be made to the above method embodiment. The implementation principle and technical effect are similar, and will not be elaborated here in this embodiment.

[0111] In the above embodiment, it should be understood that the processor may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the invention can be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0112] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (Non-volatile Memory, NVM), such as at least one disk memory.

[0113] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the buses in the drawings of this application are not limited to only one bus or one type of bus.

[0114] This application also provides a battery, including the electrode sheet described in the foregoing embodiment. The battery can be a traditional liquid battery or a all-solid-state battery.

[0115] Finally, it should be noted that: After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily think of other embodiments of the present invention. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include common general knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A preparation device for an electrode sheet, characterized in that, The electrode sheet includes a current collector, and a diaphragm arranged on the surface of the current collector along the extending direction of the current collector. The preparation equipment includes: A diaphragm feeding mechanism for feeding a diaphragm to a compounding roller; A current collector feeding mechanism for outputting a current collector to the compounding roller; The compounding roller is used for compounding the diaphragm and the current collector to obtain an electrode sheet; A die-cutting device is arranged on the conveyor belt between the compounding roller and the winding device, and is used for die-cutting the electrode sheet; An air knife is arranged on the conveyor belt and is located between the die-cutting device and the winding device, and is used for blowing off the diaphragm in the spacer area on the electrode sheet to obtain an electrode sheet with periodically interrupted dressing layers.

2. The preparation device according to claim 1, characterized in that, The number of the diaphragm feeding mechanisms is one or two, and the number of the diaphragm feeding structures is the same as the number of the air knives.

3. The production equipment according to claim 2, characterized in that, When the number of the diaphragm feeding mechanisms and the number of the air knives are two, the two diaphragm feeding mechanisms are symmetrically arranged on both sides of the compounding roller, and the two air knives are respectively arranged on both sides of the conveyor belt.

4. The preparation device according to any one of claims 1 to 3, characterized in that, The die-cutting device includes at least two groups of die-cutting devices; The at least two groups of die-cutting devices are sequentially arranged on the conveyor belt, and the die-cutting speed of each die-cutting device is consistent with the speed of the electrode sheet on the conveyor belt.

5. The preparation device according to any one of claims 1 to 3, characterized in that The diaphragm feeding mechanism includes a feeding device and a film-forming roller; The feeding device is used for feeding dry materials to the film-forming roller; The film-forming roller is used for performing film-forming treatment on dry materials to obtain a diaphragm and feeding the diaphragm to the compounding roller.

6. The preparation device according to claim 5, characterized in that, The film-forming roller includes at least two laminating rollers, and the last laminating roller among the at least two laminating rollers and the compounding roller jointly perform roll pressing and compounding on the diaphragm and the current collector.

7. A method for preparing an electrode sheet, characterized in that, Applied to the preparation equipment of the electrode sheet according to any one of claims 1 to 6, the method includes: Controlling the current collector feeding mechanism to feed the current collector to the compounding roller; Controlling the diaphragm feeding mechanism to feed the diaphragm to the compounding roller; Controlling the compounding roller to perform roll pressing and compounding on the current collector and the diaphragm to obtain an electrode sheet; Controlling the die-cutting device to die-cut the dressing area and the spacer area of the diaphragm in the electrode sheet; Controlling the air knife to blow off the diaphragm in the spacer area on the die-cut electrode sheet to obtain an electrode sheet with periodically interrupted dressing layers.

8. The method according to claim 7, wherein The controlling the compounding roller to perform roll pressing and compounding on the current collector and the diaphragm includes: Controlling the compounding roller to perform pressing and pressure relief respectively according to a preset pressing time interval and pressure relief time interval to perform roll pressing and compounding on the current collector and the diaphragm.

9. An electrode sheet, characterized in that, The electrode sheet is obtained by the preparation equipment of the electrode sheet according to any one of claims 1 to 6, and / or, the preparation method of the electrode sheet according to claim 7 or 8.

10. A control device, characterized in that, Including: A processor and a memory, The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory, so that the processor executes the method according to claim 7 or 8.

11. A battery, characterized in that, Including the electrode sheet according to claim 9.

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