Electrode Detection and Control System

Abstract

This application provides a battery electrode detection and control system that can improve the yield of electrode sheets. The electrode detection and control system is applied to an electrode coating system, which includes an unwinding device, a first-side coating device, a first-side drying device, and a winding device arranged in sequence. The electrode detection and control system includes a first detection device disposed between the unwinding device and the first-side coating device. The first detection device is used to detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device, wherein the first surface is perpendicular to the thickness direction of the electrode substrate.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode detection and control system. Background Technology

[0002] With increasing environmental pollution, the new energy industry is attracting more and more attention. Within this industry, battery technology is a crucial factor in its development. The advancement of battery technology requires consideration of various design factors, such as energy density, cycle life, and yield.

[0003] The design of electrodes in a battery cell is crucial to its yield and performance. Therefore, improving electrode yield has become a pressing technical problem to be solved in this field. Summary of the Invention

[0004] This application provides an electrode detection and control system that can improve the yield of electrode sheets.

[0005] In a first aspect, an electrode detection and control system is provided, applied to an electrode coating system. The electrode coating system includes an unwinding device, a first-side coating device, a first-side drying device, and a winding device arranged in sequence. The electrode detection and control system includes a first detection device disposed between the unwinding device and the first-side coating device. The first detection device is used to detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device, wherein the first surface is perpendicular to the thickness direction of the electrode substrate.

[0006] In this embodiment, a first detection device is provided in the electrode detection and control system. The first detection device is used to detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device. The first surface is perpendicular to the thickness direction of the electrode substrate. The first detection device is disposed between the unwinding device and the first surface coating device. The electrode detection and control system can adjust the size of the coating film corresponding to the area to be coated on the first surface of the electrode substrate in the electrode substrate or the first surface coating device in a timely manner according to the detection result of the first detection device. This reduces the risk of electrode rejection due to untimely detection, improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0007] In some implementations, the electrode detection and control system further includes a first cutting device disposed between the first detection device and the first surface coating device. The first cutting device is used to adjust the size of the coating film in the first surface coating device corresponding to the area to be coated on the first surface of the electrode substrate according to the detection result of the first detection device.

[0008] In this embodiment of the application, a first cutting device is provided in the electrode detection and control system. The first cutting device is used to adjust the size of the coating film corresponding to the area to be coated on the first surface of the electrode substrate in the first coating device according to the detection result of the first detection device. The first cutting device is located between the first detection device and the first coating device. The first cutting device can adjust the size of the coating film corresponding to the area to be coated on the first surface of the electrode substrate in the first coating device in a timely manner according to the detection result of the first detection device, so as to reduce the risk of electrode rejection due to untimely detection, improve the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0009] In some implementations, the electrode detection and control system further includes a second detection device disposed between the first coating device and the first drying device, the second detection device being used to detect the size of the coating area on the first surface of the first electrode output by the first coating device.

[0010] In this embodiment of the application, a second detection device is provided in the electrode detection and control system. The second detection device is used to detect the size of the coating area on the first surface of the first electrode output by the first surface coating device. The second detection device is located between the first surface coating device and the first surface drying device. The electrode detection and control system can adjust the position of the electrode substrate output by the unwinding device in a timely manner according to the detection result of the second detection device, thereby reducing the risk of electrode scrap due to untimely detection, improving the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and improving the manufacturing efficiency of the electrode.

[0011] In some implementations, the electrode detection and control system further includes: a first correction device, which is disposed between the unwinding device and the first surface coating device, and is used to adjust the position of the electrode substrate output by the unwinding device according to the detection result of the second detection device.

[0012] In this embodiment of the application, a first correction device is provided in the electrode detection and control system. The first correction device is used to adjust the position of the electrode substrate output by the unwinding device according to the detection result of the second detection device. The first correction device is located between the unwinding device and the first side coating device. The first correction device can adjust the position of the electrode substrate output by the unwinding device in a timely manner according to the detection result of the second detection device, so that the position of the coating film in the first side coating device corresponding to the area to be coated on the first surface of the electrode substrate output by the unwinding device matches the position of the area to be coated on the first surface. This effectively reduces the risk of electrode rejection due to untimely detection, further improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0013] In some implementations, the electrode coating system further includes a second-side coating device and a second-side drying device arranged sequentially between the first-side drying device and the winding device. The electrode detection control system further includes a third detection device disposed between the first-side drying device and the second-side coating device. The third detection device is used to detect the size of the area to be coated on the second surface of the first electrode output from the first-side drying device, wherein the second surface is perpendicular to the thickness direction of the first electrode.

[0014] In this embodiment, a third detection device is provided in the electrode detection and control system. The third detection device is used to detect the size of the area to be coated on the second surface of the first electrode output from the first surface drying device. The third detection device is located between the first surface drying device and the second surface coating device. The electrode detection and control system can adjust the size of the area to be coated on the second surface of the first electrode output from the first surface drying device and the size of the coating film corresponding to the area to be coated on the second surface of the first electrode output from the first surface drying device in a timely manner according to the detection result of the third detection device. This reduces the risk of electrode scrap due to untimely detection, improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0015] In some implementations, the electrode detection and control system further includes a second cutting device disposed between the third detection device and the second surface coating device. The second cutting device is used to adjust the size of the coating film in the second surface coating device corresponding to the area to be coated on the second surface of the first electrode output by the first surface drying device according to the detection result of the third detection device.

[0016] In this embodiment, a second cutting device is provided in the electrode detection and control system. The second cutting device is used to adjust the size of the coating film in the second coating device corresponding to the area to be coated on the second surface of the first electrode output from the first drying device according to the detection result of the third detection device. The second cutting device is located between the third detection device and the second coating device. The second cutting device can adjust the size of the coating film in the second coating device corresponding to the area to be coated on the second surface of the first electrode output from the first drying device in a timely manner according to the detection result of the third detection device, so as to reduce the risk of electrode rejection due to untimely detection, improve the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0017] In some implementations, the electrode coating system further includes a second-side coating device and a second-side drying device arranged sequentially between the first-side drying device and the winding device. The electrode detection control system further includes a fourth detection device disposed between the second-side coating device and the second-side drying device. The fourth detection device is used to detect the size of the coating area on the second surface of the first electrode output by the second-side coating device.

[0018] In this embodiment of the application, a fourth detection device is provided in the electrode detection and control system. The fourth detection device is used to detect the size of the coating area on the second surface of the first electrode output by the second surface coating device. The fourth detection device is located between the second surface coating device and the second surface drying device. The electrode detection and control system can adjust the position of the first electrode output by the first surface drying device in a timely manner according to the detection result of the fourth detection device, thereby reducing the risk of electrode scrap due to untimely detection, improving the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and improving the manufacturing efficiency of the electrode.

[0019] In some implementations, the electrode detection and control system further includes a second correction device, which is disposed between the first side drying device and the second side coating device. The second correction device is used to adjust the position of the first electrode output by the first side drying device according to the detection result of the fourth detection device.

[0020] In this embodiment, a second correction device is provided in the electrode detection and control system. The second correction device is used to adjust the position of the first electrode output from the first side drying device according to the detection result of the fourth detection device. The second correction device is located between the first side drying device and the second side coating device. The second correction device can adjust the position of the first electrode output from the first side drying device in a timely manner according to the detection result of the fourth detection device, so that the position of the coating film in the second side coating device corresponding to the area to be coated on the second side of the first electrode output from the first side drying device matches the position of the area to be coated on the second side. This effectively reduces the risk of electrode rejection due to untimely detection, further improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0021] In some implementations, the electrode detection and control system further includes: a fifth detection device disposed between the first side drying device and the second side coating device, the fifth detection device being used to detect the size of the coating area on the first side of the first electrode output from the first side drying device; the second correction device is also used to adjust the position of the first electrode output from the first side drying device according to the detection results of the fifth detection device and the fourth detection device.

[0022] In this embodiment, a fifth detection device is provided in the electrode detection and control system. The fifth detection device is used to detect the size of the coating area on the first surface of the first electrode output from the first surface drying device. The fifth detection device is located between the first surface drying device and the second surface coating device. The electrode detection and control system can adjust the position of the first electrode output from the first surface drying device through the second correction device according to the detection results of the fifth detection device and the fourth detection device. This ensures that the misalignment size of the coating area on the first surface and the second surface of the first electrode output from the second surface coating device is within the specification range, thereby effectively reducing the risk of electrode scrap due to untimely detection, further improving the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and improving the manufacturing efficiency of the electrode.

[0023] In some implementations, the electrode detection control system further includes: a sixth detection device disposed between the first coating device and the first drying device, the sixth detection device being used to detect the weight and / or thickness of the first electrode output by the first coating device; the first coating device including at least two calendering rolls, the first coating device being used to adjust the distance between any two of the at least two calendering rolls and the roll pressure according to the detection result of the sixth detection device.

[0024] In this embodiment of the application, a sixth detection device is provided in the electrode detection and control system. The sixth detection device is used to detect the weight and / or thickness of the first electrode output by the first side coating device. The sixth detection device is located between the first side coating device and the first side drying device. The electrode detection and control system can adjust the distance between any two calendering rollers of at least two calendering rollers in the first side coating device and the rolling pressure according to the detection result of the sixth detection device, so as to improve the weight consistency of the first electrode output by the first side coating device, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0025] In some implementations, the electrode detection control system further includes: a seventh detection device disposed between the second-side coating device and the second-side drying device, the seventh detection device being used to detect the weight and / or thickness of the first electrode output by the second-side coating device; the second-side coating device including at least two calendering rolls, the second-side coating device being used to adjust the distance between any two of the at least two calendering rolls and the roll pressure according to the detection result of the seventh detection device.

[0026] In this embodiment of the application, a seventh detection device is provided in the electrode detection and control system. The seventh detection device is used to detect the weight and / or thickness of the first electrode output by the second side coating device. The seventh detection device is located between the second side coating device and the second side drying device. The electrode detection and control system can adjust the distance between any two calendering rollers of at least two calendering rollers in the second side coating device and the rolling pressure according to the detection result of the seventh detection device, so as to improve the weight consistency of the first electrode output by the second side coating device, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0027] In some implementations, at least one support roller may be provided on one or both sides of at least two calendering rollers in the first coating apparatus and / or the second coating apparatus, wherein the axis of the at least one support roller is in the same plane as the axis of the at least two calendering rollers and is parallel to each other.

[0028] In the embodiments of this application, when at least two calendering rolls in the first coating device and / or the second coating device rotate, the at least one support roll can rotate with the at least two calendering rolls to support the at least two calendering rolls, reduce the deformation of the calendering rolls in the thickness direction of the electrode sheet, improve the thickness uniformity of the electrode sheet, thereby improving the yield and quality of the electrode sheet, and at the same time improving the manufacturing efficiency of the electrode sheet. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the structure of a battery provided in one embodiment of this application.

[0032] Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0033] Figure 4 This is a schematic flowchart of an electrode detection and control system provided in one embodiment of this application.

[0034] Figure 5 This is a schematic block diagram of another electrode detection and control system provided in another embodiment of this application.

[0035] Figure 6 This is a flowchart illustrating another electrode detection and control system provided in another embodiment of this application.

[0036] The accompanying drawings are not drawn to scale. Detailed Implementation

[0037] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description and accompanying drawings of the following embodiments are used to illustrate the principles of the embodiments of this application by way of example, but should not be used to limit the scope of the embodiments of this application, that is, the embodiments of this application are not limited to the described embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application pertain; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application; the terms "comprising" and "having" and any variations thereof in the specification, claims and foregoing description of the drawings of this application are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

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

[0041] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0042] It should be understood that in the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0043] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0046] In this application, a battery refers to a physical module comprising one or more battery cells to provide electrical energy. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing can reduce the impact of liquids or other foreign matter on the charging or discharging of the battery cells.

[0047] It should be understood that the battery cells in the embodiments of this application include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0048] In some implementations, the battery cell in the embodiments of this application can be a metal battery. Specifically, the metal battery may include a lithium metal secondary battery, a sodium metal battery, or a magnesium metal battery, etc.

[0049] In some implementations, a single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0050] In some implementations, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0051] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0052] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0053] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. In some implementations, other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4, also known as LFP), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites.

[0054] As an example, the positive electrode active material may include at least one of sodium transition metal oxides, polyanionic compounds, and Prussian blue compounds:

[0055] In some implementations, the chemical formula of the sodium transition metal oxide can satisfy Na x MO2, where M is one or more of the following elements: Ti, V, Mn, Co, Ni, Fe, Zn, V, Zr, Ce, Cr, and Cu, where 0 < x ≤ 1. As an example, Na... x In MO2, x can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.

[0056] In some implementations, the sodium transition metal oxide can be a doped sodium transition metal oxide, and the doping modification of the sodium transition metal oxide can include at least one of sodium site doping modification, oxygen site doping modification, transition metal site doping modification, and surface coating modification.

[0057] In some implementations, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source materials, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, with the lithium source material being lithium metal and / or lithium-rich materials.

[0058] In some implementations, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0059] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can be formed by forming a metal material (copper, copper 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.).

[0060] In some implementations, the battery cell in the embodiments of this application may be a sodium-free secondary battery.

[0061] A negative electrode-less sodium secondary battery refers to a battery cell in which a negative electrode active material layer is not actively formed on the negative electrode side during the battery cell manufacturing process. For example, a sodium metal or carbonaceous active material layer is not formed at the negative electrode through coating or deposition processes during the battery cell manufacturing process. During the first charge, sodium ions gain electrons on the anode side to deposit on the current collector surface to form a sodium metal phase. During discharge, the metallic sodium can be converted into sodium ions and return to the positive electrode, achieving charge-discharge cycles. Compared with other sodium secondary batteries, a negative electrode-less sodium secondary battery cell can achieve a higher energy density because it lacks a negative electrode active material layer.

[0062] In some implementations, in order to improve the performance of individual cells, functional coatings such as carbonaceous materials, metal oxides, and alloys can be applied to the negative electrode side of the sodium-free secondary battery to improve the conductivity of the negative electrode current collector and the uniformity of the deposited sodium metal.

[0063] In some implementations, the CB value of a sodium-ion secondary battery without a negative electrode is less than or equal to 0.1.

[0064] Specifically, the CB value is the capacity per unit area of ​​the negative electrode in a secondary battery divided by the capacity per unit area of ​​the positive electrode. Since batteries without a negative electrode contain little or no functional coating, the capacity per unit area of ​​the negative electrode is relatively small, and the CB value of the secondary battery is less than or equal to 0.1.

[0065] In some implementations, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0066] In some implementations, the electrode assembly also includes an isolator disposed between the positive and negative electrodes.

[0067] In some implementations, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0068] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0069] In some implementations, the separator is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0070] In some implementations, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0071] In some implementations, the electrode assembly can be a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0072] In some implementations, the electrode assembly is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately.

[0073] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0074] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0075] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0076] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0077] In some implementations, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0078] In some implementations, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0079] In some implementations, the battery cell may include a casing. The casing is used to encapsulate components such as electrode assemblies and electrolytes. The casing can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0080] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0081] To meet different power demands, the battery in this embodiment may include multiple battery cells, which can be connected in series, parallel, or a combination thereof. Optionally, multiple battery cells can first be connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form a battery. That is, multiple battery cells can directly form a battery, or they can first be formed into a battery module, and then the battery modules can be formed into a battery. The battery is then further installed in electrical equipment to provide power to the equipment.

[0082] Currently, with the increasing severity of environmental pollution, the new energy industry is receiving more and more attention. Within this industry, battery technology is a crucial factor in its development. The development of battery technology requires consideration of various design factors, such as energy density, cycle life, and yield. Battery production is a complex process involving multiple steps, including mixing, coating, rolling, die-cutting, winding, electrolyte injection, and formation. Among these, the coating process is indispensable, significantly impacting battery performance. The stability, uniformity, and dimensions of the coating all affect the final battery performance. Specifically, the dimensions of the A and B sides of the coating, including positional dimensions, width dimensions, and A / B side misalignment dimensions, all have a significant impact on battery performance. The electrode design within the battery cell is crucial for the yield and performance of the battery cell.

[0083] While the battery industry is still in the early research stages of continuous electrode production, premixed powder cannot be uniformly formed into films, and after film formation, continuous winding is not possible. Roll pressing of powder to thin self-supporting films results in large weight fluctuations and poor consistency, reducing overall equipment efficiency and limiting mass production feasibility. Furthermore, pressing premixed fibrous materials into films of uniform thickness after feeding is difficult, with poor thickness consistency in the width direction. Wide-width roll pressing leads to uneven lateral thickness, resulting in low electrode yield. Simultaneously, the lack of effective testing equipment makes it difficult to inspect the dimensions of the coated areas on the first and second sides of the finished electrode, leading to poor dimensional consistency and excessively long debugging times after quality issues arise. Therefore, improving electrode yield has become a pressing technical problem in this field.

[0084] In view of this, this application provides an electrode detection and control system applied to an electrode coating system. The electrode coating system includes an unwinding device, a first-side coating device, a first-side drying device, and a rewinding device arranged sequentially. The electrode detection and control system includes a first detection device disposed between the unwinding device and the first-side coating device. The first detection device is used to detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device, where the first surface is perpendicular to the thickness direction of the electrode substrate. Thus, in this application embodiment, the electrode detection and control system can adjust the size of the electrode substrate or the coating film corresponding to the area to be coated on the first surface of the electrode substrate in a timely manner based on the detection result of the first detection device. This reduces the risk of electrode rejection due to untimely detection, improves the consistency of electrode coating dimensions, and thereby improves the yield and quality of the electrode, while also increasing the manufacturing efficiency of the electrode.

[0085] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0086] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical equipment described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of electrical equipment.

[0087] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery 10 can be installed inside vehicle 1. The controller 30 controls the battery 10 to supply power to the motor 40. For example, the battery 10 can be installed at the bottom, front, or rear of vehicle 1. The battery 10 can be used to power vehicle 1; for example, it can serve as the operating power source for the vehicle 1's electrical system, such as for the power requirements of starting, navigation, and operation. In another implementation of this application, the battery 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to vehicle 1.

[0088] To meet different power demands, the battery 10 in this embodiment can be either a group of battery cells or a battery pack. The battery 10 may include at least one group of battery cells, which in turn includes multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery 10. A combination of series and parallel connections is used. The battery 10 can also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules can be connected in series, parallel, or a combination thereof to form the battery 10. That is to say, multiple battery cells can be directly assembled into the battery 10, or they can be first assembled into battery modules, and then the battery modules can be assembled into the battery 10.

[0089] In some implementations, the battery 10 may include multiple battery cells. For example, such as Figure 2 The diagram shown is a structural schematic of a battery 10 according to an embodiment of this application. The battery 10 may include multiple battery cells 20. The battery 10 may also include a housing 11, which has a hollow interior, and the multiple battery cells 20 are housed within the housing 11. For example, the multiple battery cells 20 may be connected in parallel, series, or a combination thereof and then placed inside the housing 11.

[0090] In some implementations, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0091] In this embodiment, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery 10 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0092] like Figure 3 The diagram shown is a structural schematic of a battery cell 20 according to an embodiment of this application. The battery cell 20 includes one or more electrode assemblies 22, a housing 211, and a cover plate 212. The housing 211 and the cover plate 212 form an outer shell or battery box 21. The walls of the housing 211 and the cover plate 212 are both referred to as the walls of the battery cell 20. For a cuboid battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 depends on the shape of the combined one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one side of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open surface, that is, this plane does not have a wall, allowing communication between the inside and outside of the housing 211. When the housing 211 can be a hollow cylinder, the end face of the housing 211 is an open face, that is, the end face does not have a wall, so that the inside and outside of the housing 211 are connected. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0093] The battery cell 20 may also include two electrode terminals 214, which can be disposed on a cover plate 212. The cover plate 212 is typically flat, and the two electrode terminals 214 are fixed to the flat surface of the cover plate 212. The two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. Each electrode terminal 214 is provided with a corresponding connecting member, or current collector, which is located between the cover plate 212 and the electrode assembly 22, and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0094] like Figure 3 As shown, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive tab, the second tab 222a is a negative tab.

[0095] In this battery cell 20, depending on actual usage requirements, the electrode assembly 22 can be configured as a single unit or multiple units, such as... Figure 3 As shown, the battery cell 20 contains two independent electrode assemblies 22.

[0096] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0097] The pressure relief mechanism 213 can be any of the possible pressure relief structures. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0098] Figure 4 A schematic block diagram of an electrode detection and control system 100 provided in an embodiment of this application is shown.

[0099] In some implementations, such as Figure 4 As shown, the electrode detection and control system 100 can be applied to an electrode coating system. The electrode coating system includes an unwinding device 101, a first-side coating device 102, a first-side drying device 103, and a winding device 104 arranged in sequence. The electrode detection and control system 100 includes a first detection device 105, which is disposed between the unwinding device 101 and the first-side coating device 102. The first detection device 105 is used to detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device 101. The first surface is perpendicular to the thickness direction of the electrode substrate.

[0100] It should be understood that the electrode substrate in the embodiments of this application may include aluminum foil, and the electrode obtained based on the electrode substrate is a positive electrode. Alternatively, the electrode substrate may include copper foil, and the electrode obtained based on the electrode substrate is a negative electrode.

[0101] It should also be understood that the area to be coated on the first surface of the aforementioned electrode substrate is the area where the slurry needs to be applied. The first surface can be one of the surfaces on the electrode substrate to which the slurry is applied; it can be the front or the back of the electrode substrate. Secondly, the second surface of the electrode substrate can be a surface on the electrode substrate corresponding to the first surface. For example, if the first surface is the front of the electrode substrate, then the second surface is the back of the electrode substrate; if the first surface is the back of the electrode substrate, then the second surface is the front of the electrode substrate.

[0102] It should also be understood that the size of the area to be coated on the first surface of the electrode substrate in the embodiments of this application can be the size of the area to be coated along the width direction of the electrode substrate. The slurry in the embodiments of this application can also be referred to as the active material. If the electrode substrate includes aluminum foil, the slurry may include lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. If the electrode substrate includes copper foil, the slurry may include carbon or silicon, etc.

[0103] It should also be understood that, in some implementations, the first detection device 105 can also be used to detect the size of the tab-forming region on the first surface of the electrode substrate output by the unwinding device 101, the tab-forming region being used to form the tab portion of the electrode, and then determine the size of the area to be coated. The first detection device 105 can be any imaging device capable of performing the above functions; for example, the first detection device 105 can be a charge-coupled device (CCD) vision system.

[0104] In this embodiment, a first detection device 105 is provided in the electrode detection and control system 100. The first detection device 105 is used to detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device 101. The first surface is perpendicular to the thickness direction of the electrode substrate. The first detection device 105 is disposed between the unwinding device 101 and the first surface coating device 102. The electrode detection and control system 100 can adjust the size of the coating film corresponding to the area to be coated on the first surface of the electrode substrate in the electrode substrate or the first surface coating device 102 in a timely manner according to the detection result of the first detection device 105. This reduces the risk of electrode scrap due to untimely detection, improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0105] In some implementations, such as Figure 4 As shown, the electrode detection and control system 100 also includes a first cutting device 106, which is disposed between the first detection device 105 and the first surface coating device 102. The first cutting device 106 is used to adjust the size of the coating film in the first surface coating device 102 corresponding to the area to be coated on the first surface of the electrode substrate according to the detection result of the first detection device 105.

[0106] Specifically, in this embodiment, after the first detection device 105 and the first cutting device 106 are provided in the electrode detection and control system 100, the electrode detection and control system 100 can detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device 101 through the first detection device 105, and compare it with the size of the coated film output by the first surface coating device 102. A linear regression equation is then used to analyze whether the size of the area to be coated is within the process specifications. If the closed-loop adjustment amount is 0, the system waits for the next closed-loop data acquisition control cycle. The size of the area to be coated on the first surface of the electrode substrate output by the unwinding device 101 is then detected again by the first detection device 105. If the closed-loop adjustment amount is not 0, the first cutting device 106 is called to adjust the size of the coating film in the first surface coating device 102 corresponding to the area to be coated on the first surface of the electrode substrate. After the adjustment is completed, the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device 101 is detected again by the first detection device 105 after the next closed-loop data acquisition control cycle, so as to realize closed-loop control.

[0107] Thus, in this embodiment of the application, a first cutting device 106 is provided in the electrode detection and control system 100. The first cutting device 106 is used to adjust the size of the coating film corresponding to the area to be coated on the first surface of the electrode substrate in the first surface coating device 102 according to the detection result of the first detection device 105. The first cutting device 106 is located between the first detection device 105 and the first surface coating device 102. The first cutting device 106 can adjust the size of the coating film corresponding to the area to be coated on the first surface of the electrode substrate in the first surface coating device 102 in a timely manner according to the detection result of the first detection device 105, so as to reduce the risk of electrode scrap due to untimely detection, improve the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0108] In some implementations, such as Figure 4 As shown, the electrode detection and control system also includes a second detection device 107, which is disposed between the first surface coating device 102 and the first surface drying device 103. The second detection device 107 is used to detect the size of the coating area on the first surface of the first electrode output by the first surface coating device 102.

[0109] It should be understood that, in this embodiment, the coating area on the first surface of the first electrode sheet output by the first surface coating device 102 refers to the area formed after the first surface coating device 102 coats the first surface of the electrode sheet substrate. The size of the coating area on the first surface of the first electrode sheet output by the first surface coating device 102 in this embodiment can be the size along the width direction of the first electrode sheet. The second detection device 107 can be any imaging device capable of achieving the above functions; for example, the second detection device 107 can be a CCD vision system.

[0110] In this embodiment of the application, a second detection device 107 is provided in the electrode detection and control system 100. The second detection device 107 is used to detect the size of the coating area on the first surface of the first electrode output by the first surface coating device 102. The second detection device 107 is located between the first surface coating device 102 and the first surface drying device 103. The electrode detection and control system 100 can adjust the position of the electrode substrate output by the unwinding device 101 in a timely manner according to the detection result of the second detection device 107, thereby reducing the risk of electrode scrap due to untimely detection, improving the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and improving the manufacturing efficiency of the electrode.

[0111] In some implementations, such as Figure 4 As shown, the electrode detection and control system 100 also includes a first correction device 108, which is disposed between the unwinding device 101 and the first surface coating device 102. The first correction device 108 is used to adjust the position of the electrode substrate output by the unwinding device 101 according to the detection result of the second detection device 107.

[0112] In this embodiment, by setting a first correction device 108 in the electrode detection and control system 100, the first correction device 108 is used to adjust the position of the electrode substrate output by the unwinding device 101 according to the detection result of the second detection device 107. The first correction device 108 is located between the unwinding device 101 and the first surface coating device 102. The first correction device 108 can adjust the position of the electrode substrate output by the unwinding device 101 in a timely manner according to the detection result of the second detection device 107, so that the position of the coating film in the first surface coating device 102 corresponding to the area to be coated on the first surface of the electrode substrate output by the unwinding device 101 matches the position of the area to be coated on the first surface. This effectively reduces the risk of electrode scrap due to untimely detection, further improves the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and improving the manufacturing efficiency of the electrode.

[0113] Figure 5A schematic block diagram of an electrode detection and control system 300 according to another embodiment of this application is shown.

[0114] It should be understood that, in order to reduce redundancy in the embodiments of this application, Figure 4 The unwinding device 101, the first correction device 108, the first detection device 105, the first cutting device 106, the first surface coating device 102, the second detection device 107, and the first surface drying device 103 shown in the electrode detection and control system 100 can be replaced by the first device 200.

[0115] In some implementations, such as Figure 5 As shown, the electrode coating system also includes a second-side coating device 109 and a second-side drying device 110 arranged sequentially between the first-side drying device 103 and the winding device 104. The electrode detection control system 300 may include a third detection device 111, which is disposed between the first-side drying device 103 and the second-side coating device 109. The third detection device 111 is used to detect the size of the area to be coated on the second surface of the first electrode output by the first-side drying device 103, and the second surface is perpendicular to the thickness direction of the first electrode.

[0116] It should be understood that the area to be coated on the second surface of the first electrode is the area where the slurry needs to be applied. This second surface can be one of the surfaces on the electrode substrate to which the slurry is applied; it can be the front or the back of the electrode substrate. Furthermore, the second surface of the electrode substrate can be a surface on the electrode substrate corresponding to the first surface. For example, if the first surface is the front of the electrode substrate, then the second surface is the back of the electrode substrate; if the first surface is the back of the electrode substrate, then the second surface is the front of the electrode substrate.

[0117] It should also be understood that the size of the area to be coated on the second surface of the first electrode sheet output by the first surface drying device 103 in the embodiments of this application can be the size of the area to be coated along the width direction of the first electrode sheet.

[0118] It should also be understood that, in some implementations, the third detection device 111 can also be used to detect the size of the tab-forming area on the second surface of the first electrode sheet output by the first surface drying device 103, and then determine the size of the area to be coated. The third detection device 111 can be any imaging device capable of performing the above functions; for example, the third detection device 111 can be a CCD vision system.

[0119] In this embodiment, a third detection device 111 is provided in the electrode detection and control system 300. The third detection device 111 is used to detect the size of the area to be coated on the second surface of the first electrode output by the first surface drying device 103. The third detection device 111 is located between the first surface drying device 103 and the second surface coating device 109. The electrode detection and control system 300 can adjust the size of the area to be coated on the second surface of the first electrode output by the first surface drying device 103 and the size of the coating film corresponding to the area to be coated on the second surface of the first electrode output by the first surface drying device 103 in the second surface coating device 109 according to the detection result of the third detection device 111. This reduces the risk of electrode scrap due to untimely detection, improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0120] In some implementations, such as Figure 5 As shown, the electrode detection and control system 300 also includes a second cutting device 112, which is disposed between the third detection device 111 and the second surface coating device 109. The second cutting device 112 is used to adjust the size of the coating film in the second surface coating device 109 corresponding to the area to be coated on the second surface of the first electrode output by the first surface drying device 103 according to the detection result of the third detection device 111.

[0121] Specifically, in this embodiment, after the third detection device 111 and the second cutting device 112 are set in the electrode detection and control system 300, the electrode detection and control system 300 can detect the size of the area to be coated on the second surface of the first electrode output by the first surface drying device 103 through the third detection device 111, and compare it with the size of the coated film output by the second surface coating device 109. A linear regression equation is then used to analyze whether the size of the area to be coated is within the process specifications. If the closed-loop adjustment is 0, the system waits for the next closed-loop data acquisition control cycle before proceeding. The third detection device 111 detects the size of the area to be coated on the second surface of the first electrode output from the first drying device 103. If the closed-loop adjustment amount is not zero, the second cutting device 112 is called to adjust the size of the coating film in the second coating device 109 corresponding to the area to be coated on the second surface of the first electrode in a timely manner. After the adjustment is completed, the size of the area to be coated on the second surface of the first electrode output from the first drying device 103 is detected again by the third detection device 111 after the next closed-loop data acquisition control cycle, so as to realize closed-loop control.

[0122] In this embodiment, a second cutting device 112 is provided in the electrode detection and control system 300. The second cutting device 112 is used to adjust the size of the coating film in the second coating device 109 corresponding to the area to be coated on the second surface of the first electrode output by the first drying device 103 according to the detection result of the third detection device 111. The second cutting device 112 is located between the third detection device 111 and the second coating device 109. The second cutting device 112 can adjust the size of the coating film in the second coating device 109 corresponding to the area to be coated on the second surface of the first electrode output by the first drying device 103 in a timely manner according to the detection result of the third detection device 111, so as to reduce the risk of electrode scrap due to untimely detection, improve the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0123] In some implementations, such as Figure 5 As shown, the electrode coating system further includes a second-side coating device 109 and a second-side drying device 110 arranged sequentially between the first-side drying device 103 and the winding device 104. The electrode detection control system 300 further includes a fourth detection device 113, which is disposed between the second-side coating device 109 and the second-side drying device 110. The fourth detection device 113 is used to detect the size of the coating area on the second surface of the first electrode output by the second-side coating device 109.

[0124] It should be understood that, in this embodiment, the coated area on the second surface of the first electrode sheet output by the second surface coating device 109 refers to the area formed after the second surface coating device 109 coats the second surface of the first electrode sheet. The size of the coated area on the second surface of the first electrode sheet output by the second surface coating device 109 in this embodiment can be the size along the width direction of the first electrode sheet. The fourth detection device 113 can be any imaging device capable of achieving the above functions; for example, the fourth detection device 113 can be a CCD vision system.

[0125] In this embodiment, by providing a fourth detection device 113 in the electrode detection control 300 system, the fourth detection device 113 is used to detect the size of the coating area on the second surface of the first electrode output by the second surface coating device 109. The fourth detection device 113 is located between the second surface coating device 109 and the second surface drying device 110. The electrode detection control system 300 can adjust the position of the first electrode output by the first surface drying device 103 in a timely manner according to the detection result of the fourth detection device 113, thereby reducing the risk of electrode scrap due to untimely detection, improving the coating size consistency of the electrode, thereby improving the yield and quality of the electrode, and improving the manufacturing efficiency of the electrode.

[0126] In some implementations, such as Figure 5 As shown, the electrode detection and control system 300 also includes a second correction device 114, which is disposed between the first side drying device 103 and the second side coating device 109. The second correction device 114 is used to adjust the position of the first electrode output by the first side drying device 103 according to the detection result of the fourth detection device 113.

[0127] In this embodiment, a second correction device 114 is provided in the electrode detection and control system 300. The second correction device 114 is used to adjust the position of the first electrode output from the first side drying device 103 according to the detection result of the fourth detection device 113. The second correction device 114 is located between the first side drying device 103 and the second side coating device 109. The second correction device 114 can adjust the position of the first electrode output from the first side drying device 103 in a timely manner according to the detection result of the fourth detection device 113, so that the position of the coating film in the second side coating device 109 corresponding to the area to be coated on the second side of the first electrode output from the first side drying device 103 matches the position of the area to be coated on the second side. This effectively reduces the risk of electrode rejection due to untimely detection, further improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0128] In some implementations, such as Figure 5 As shown, the electrode detection and control system 300 further includes a fifth detection device 115, which is disposed between the first side drying device 103 and the second side coating device 109. The fifth detection device 115 is used to detect the size of the coating area on the first side of the first electrode output by the first side drying device 103. The second correction device 114 is also used to adjust the position of the first electrode output by the first side drying device 103 according to the detection results of the fifth detection device 115 and the fourth detection device 113.

[0129] Specifically, in this embodiment, after setting a fourth detection device 113, a second correction device 114, and a fifth detection device 115 in the electrode detection and control system 300, the fourth detection device 113 detects the size of the coating area on the second surface of the first electrode output by the second surface coating device 109, and the fifth detection device 115 detects the size of the coating area on the first surface of the first electrode output by the first surface drying device 103. Based on the detection results of the fourth detection device 113 and the fifth detection device 115, multiple dislocation values ​​are determined. The dislocation value can be the difference between the distance between the edge of the coating area on the first surface of the first electrode and the distance between the edge of the coating area on the second surface of the first electrode and the reference edge. Then, the closed-loop adjustment amount is determined according to the dislocation value and the preset correction amount. If the closed-loop adjustment amount is 0, the system waits for the next closed-loop data acquisition control cycle and then passes the fourth detection device again. The device 113 detects the size of the coating area on the second surface of the first electrode output by the second surface coating device 109, and the fifth detection device 115 detects the size of the coating area on the first surface of the first electrode output by the first surface drying device 103. If the closed-loop adjustment amount is not 0, the second correction device 114 is called to adjust the position of the first electrode output by the first surface drying device 103, so that the misalignment value between the coating areas on the first and second surfaces of the first electrode output by the second surface coating device 109 is within the specification range. After the adjustment is completed, the device waits for the next closed-loop data acquisition control cycle and then detects the size of the coating area on the second surface of the first electrode output by the second surface coating device 109 again by the fourth detection device 113, and the size of the coating area on the first surface of the first electrode output by the first surface drying device 103 again by the fifth detection device 115, so as to realize closed-loop control.

[0130] In this embodiment, a fifth detection device 115 is provided in the electrode detection and control system 300. The fifth detection device 115 is used to detect the size of the coating area on the first surface of the first electrode output by the first surface drying device 103. The fifth detection device 115 is located between the first surface drying device 103 and the second surface coating device 109. The electrode detection and control system 300 can adjust the position of the first electrode output by the first surface drying device 103 through the second correction device 114 according to the detection results of the fifth detection device 115 and the fourth detection device 113, so that the misalignment value between the coating area on the first surface and the second surface of the first electrode output by the second surface coating device 109 is within the specification range. This effectively reduces the risk of electrode scrap due to untimely detection, further improves the coating size consistency of the electrode, and thus improves the yield and quality of the electrode, while also improving the manufacturing efficiency of the electrode.

[0131] In some implementations, such as Figure 4 As shown, the electrode detection control system 100 further includes a sixth detection device 116, which is disposed between the first side coating device 102 and the first side drying device 103. The sixth detection device 116 is used to detect the weight and / or thickness of the first electrode output by the first side coating device 102. The first side coating device 102 includes at least two calendering rolls, and the first side coating device 102 is used to adjust the distance between any two of the at least two calendering rolls and the roll pressure according to the detection result of the sixth detection device 116.

[0132] It should be understood that the sixth detection device 116 in this application embodiment can be an automated measurement system. Using automated equipment and systems, the weight and / or thickness of the first electrode sheet output by the first coating device 102 are continuously or at high speed using sensors or weighing devices to improve detection efficiency and accuracy. Exemplarily, the sixth detection device 116 includes, but is not limited to, laser thickness measurement equipment, beta-ray or X-ray thickness measurement equipment.

[0133] It should also be understood that, in this embodiment of the application, when the electrode detection and control system 100 adjusts the distance between any two of the at least two calendering rollers in the first coating device 102 and the rolling pressure according to the sixth detection device 116, it will affect the size of the coating area on the first surface of the first electrode output by the first coating device 102 to a certain extent. Subsequently, the electrode detection and control system 100 can further control the first cutting device 106 and the first correction device 108 through the first detection device 105 and the second detection device 107 provided in the electrode detection and control system 100, so as to take into account the weight consistency and size consistency of the first electrode output by the first coating device 102, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0134] In this embodiment, a sixth detection device 116 is provided in the electrode detection control system 100. The sixth detection device 116 is used to detect the weight and / or thickness of the first electrode output by the first side coating device 102. The sixth detection device 116 is located between the first side coating device 102 and the first side drying device 103. The electrode detection control system 100 can adjust the distance between any two calendering rollers of at least two calendering rollers in the first side coating device 102 and the rolling pressure according to the detection result of the sixth detection device 116, so as to improve the weight consistency of the first electrode output by the first side coating device 102, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0135] In some implementations, such as Figure 5 As shown, the electrode detection control system 300 further includes: a seventh detection device 117, which is disposed between the second side coating device 109 and the second side drying device 110. The seventh detection device 117 is used to detect the weight and / or thickness of the first electrode output by the second side coating device 109. The second side coating device includes at least two calendering rolls, and the second side coating device 109 is used to adjust the distance between any two of the at least two calendering rolls and the roll pressure according to the detection result of the seventh detection device 117.

[0136] It should be understood that the seventh detection device 117 in this application embodiment can be an automated measurement system. Using automated equipment and systems, the weight and / or thickness of the first electrode sheet output by the second coating device 109 are continuously or at high speed measured via sensors or weighing devices to improve detection efficiency and accuracy. Exemplarily, the seventh detection device 117 includes, but is not limited to, laser thickness measurement equipment, beta-ray or X-ray thickness measurement equipment.

[0137] It should also be understood that, in this embodiment of the application, when the electrode detection and control system 300 adjusts the distance between any two of the at least two calendering rollers in the second coating device 109 and the rolling pressure according to the seventh detection device 117, it will affect the size of the coating area on the second surface of the first electrode output by the second coating device 109 to a certain extent. Subsequently, the electrode detection and control system 300 can further control the second cutting device 112 and the second correction device 114 through the third detection device 111 and the fourth detection device 113 provided in the electrode detection and control system 300, so as to take into account the weight consistency and size consistency of the first electrode output by the second coating device 109, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0138] In this embodiment, a seventh detection device 117 is provided in the electrode detection control system 300. The seventh detection device 117 is used to detect the weight and / or thickness of the first electrode output by the second side coating device 109. The seventh detection device 117 is located between the second side coating device 109 and the second side drying device 110. The electrode detection control system 300 can adjust the distance between any two calendering rollers of at least two calendering rollers in the second side coating device 109 and the rolling pressure according to the detection result of the seventh detection device 117, so as to improve the weight consistency of the first electrode output by the second side coating device 109, thereby improving the yield and quality of the electrode, and at the same time improving the manufacturing efficiency of the electrode.

[0139] In some implementations, at least one support roller may be provided on one or both sides of at least two calendering rolls in the first coating apparatus 102 or the second coating apparatus 109 of this application embodiment. The axis of the at least one support roller is coplanar with and parallel to the axes of the at least two calendering rolls. For example, a support roller may be provided on each of the left and right sides of the three consecutively arranged calendering rolls in the second coating apparatus 109. That is, the three consecutive horizontally arranged calendering rolls are disposed between the two support rollers, and the axes of the support rollers on the left and right sides are coplanar with and parallel to the axes of the three calendering rolls.

[0140] In this embodiment, when at least two calendering rolls in the first coating device 102 or the second coating device 109 rotate, the at least one support roll can rotate with the at least two calendering rolls to support the at least two calendering rolls, reduce the deformation of the calendering rolls in the thickness direction of the electrode sheet, improve the thickness uniformity of the electrode sheet, thereby improving the yield and quality of the electrode sheet, and at the same time improving the manufacturing efficiency of the electrode sheet.

[0141] In some implementations, such as Figure 6 As shown, the second-side coating apparatus 109 may include a thinning roller 1091, a transfer roller 1092, and a composite roller 1093 arranged in sequence. Because a reaction force exists on the calendering roller during the thinning of the film to be coated, causing roller deflection deformation, the thinning effect on the film is affected, reducing the yield of the electrode. In some implementations, such as... Figure 6 As shown, reducing the diameter of the thinning roller 1091 can lower the roller pressure, thereby improving the deflection deformation of the thinning roller 1091, reducing the impact on the uniformity of the film, and improving the yield and quality of the electrode. In other implementations, at least one support roller can be provided on the side of the thinning roller 1091 away from the transfer roller 1092 and the composite roller 1093 to support the thinning roller 1091, effectively reducing the deformation of the thinning roller 1091 during movement, thereby improving the thickness uniformity of the electrode, thus improving the yield and quality of the electrode, and simultaneously improving the manufacturing efficiency of the electrode.

[0142] Figure 6 This illustration shows a flowchart of an electrode detection and control system 400 according to another embodiment of this application. In some implementations, such as... Figure 6As shown, the electrode detection and control system 400 includes an unwinding device 101, a first correction device 108, a first detection device 105, a first cutting device 106, a first side coating device 102, a second detection device 107, a sixth detection device 116, a first side drying device 103, a second correction device 114, a fifth detection device 115, a third detection device 111, a second cutting device 112, a second side coating device 109, a fourth detection device 113, a seventh detection device 117, a second side drying device 110, and a winding device 104 arranged in sequence.

[0143] Although this application has been described with reference to the above embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pole piece detection control system, characterized by, The application is applied to a pole piece coating system, which comprises unwinding device, first surface coating device, first surface drying device and winding device arranged in sequence, and the pole piece detection control system comprises: a first detection device arranged between the unwinding device and the first surface coating device, which is used for detecting the size of the to-be-coated area on the first surface of the pole piece substrate output by the unwinding device, the first surface being perpendicular to the thickness direction of the pole piece substrate; a first cutting device arranged between the first detection device and the first surface coating device, which is used for adjusting the size of the coating film piece in the first surface coating device corresponding to the to-be-coated area on the first surface of the pole piece substrate output by the unwinding device according to the detection result of the first detection device.

2. The pole piece detection control system of claim 1, wherein The pole piece detection control system further comprises: a second detection device arranged between the first surface coating device and the first surface drying device, which is used for detecting the size of the coated area on the first surface of the first pole piece output by the first surface coating device.

3. The pole piece detection control system of claim 2, wherein, The pole piece detection control system further comprises: a first deviation rectifying device arranged between the unwinding device and the first surface coating device, which is used for adjusting the position of the pole piece substrate output by the unwinding device according to the detection result of the second detection device.

4. The pole piece detection control system of any one of claims 1-3, wherein, The pole piece coating system further comprises second surface coating device and second surface drying device arranged in sequence between the first surface drying device and the winding device, and the pole piece detection control system further comprises: a third detection device arranged between the first surface drying device and the second surface coating device, which is used for detecting the size of the to-be-coated area on the second surface of the first pole piece output by the first surface drying device, the second surface being perpendicular to the thickness direction of the first pole piece.

5. The pole piece detection control system of claim 4, wherein The pole piece detection control system further comprises: a second cutting device arranged between the third detection device and the second surface coating device, which is used for adjusting the size of the coating film piece in the second surface coating device corresponding to the to-be-coated area on the second surface of the first pole piece output by the first surface drying device according to the detection result of the third detection device.

6. The pole piece detection control system of any one of claims 1-3, wherein, The pole piece coating system further comprises second surface coating device and second surface drying device arranged in sequence between the first surface drying device and the winding device, and the pole piece detection control system further comprises: a fourth detection device arranged between the second surface coating device and the second surface drying device, which is used for detecting the size of the coated area on the second surface of the first pole piece output by the second surface coating device.

7. The pole piece detection control system of claim 6, wherein The pole piece detection control system further comprises: A second deviation rectifying device is arranged between the first surface drying device and the second surface coating device, and is configured to adjust the position of the first pole piece output from the first surface drying device according to the detection result of the fourth detection device.

8. The pole piece detection control system of claim 7, wherein, The pole piece detection control system further comprises: A fifth detection device is arranged between the first surface drying device and the second surface coating device, and is configured to detect the size of the coating area on the first surface of the first pole piece output from the first surface drying device. The second deviation rectifying device is further configured to adjust the position of the first pole piece output from the first surface drying device according to the detection results of the fifth detection device and the fourth detection device.

9. The pole piece detection control system of any one of claims 1-3, wherein, The pole piece detection control system further comprises: A sixth detection device is arranged between the first surface coating device and the first surface drying device, and is configured to detect the weight and / or thickness of the first pole piece output from the first surface coating device. The first surface coating device comprises at least two calender rollers, and is configured to adjust the distance between any two of the at least two calender rollers and the roll pressure according to the detection result of the sixth detection device.

10. The pole piece detection control system of claim 4, wherein, The pole piece detection control system further comprises: A seventh detection device is arranged between the second surface coating device and the second surface drying device, and is configured to detect the weight and / or thickness of the first pole piece output from the second surface coating device. The second surface coating device comprises at least two calender rollers, and is configured to adjust the distance between any two of the at least two calender rollers and the roll pressure according to the detection result of the seventh detection device.

11. The pole piece detection control system of claim 4, wherein, One side or both sides of at least two calender rollers in the first surface coating device and / or the second surface coating device are provided with at least one supporting roller, and the shaft center of the at least one supporting roller and the shaft center of the at least two calender rollers are in the same plane and parallel to each other.

Images