Electrode sheet production system, and slurry repair coating apparatus and method

Abstract

An electrode sheet production system, a slurry repair coating apparatus, and a slurry repair coating method. The slurry repair coating apparatus comprises a first detection device and a slurry repair coating device. The first detection device performs detection on an active material layer of an electrode sheet to obtain slurry deficiency information of the active material layer. On the basis of the slurry deficiency information, the slurry repair coating device performs slurry repair coating on slurry-deficient positions of the active material layer. The first detection device and the slurry repair coating device work cooperatively to realize mechanical repair coating on slurry-deficient positions of the active material layer, so as to fill the slurry-deficient positions of the active material layer with the slurry, such that electrode sheets with slurry deficiencies in active material layers can be used normally, thereby effectively alleviating the problem of waste of materials and manpower. The slurry repair coating apparatus can also be integrated into various steps of electrode sheet production processes, thereby improving the yield of electrode sheets, and improving the production efficiency.

Description

Pole piece production system, and slurry supplement coating device and method

[0001] This application refers to the Chinese Patent Application No. 202410799783.8, filed on June 20, 2024, entitled “Pole piece production system, and slurry supplement coating device and method”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of batteries, and in particular relates to a pole piece production system, and a slurry supplement coating device and method. BACKGROUND

[0003] A battery is generally composed of a plurality of battery cells, and the electrode assembly of a battery cell is formed by winding or folding a plurality of electrode pole pieces and separators. Therefore, the electrode pole piece is an important component of the battery cell.

[0004] The electrode pole piece generally includes a current collector and an active material layer covering the surface of the current collector. Defects such as missing coating, scratches, and bubbles in the active material layer during the manufacturing process will directly affect the performance of the electrode pole piece, thereby affecting the normal use of the battery cell.

[0005] The above statements are only used to provide background information related to the present application, and do not necessarily constitute the prior art.

[0006] SUMMARY

[0007] The purpose of the embodiments of the present application is to provide a pole piece production system, and a slurry supplement coating device and method, which includes but is not limited to solving the technical problem of affecting the performance of the electrode pole piece due to the defects such as missing coating, scratches, and bubbles in the active material layer of the electrode pole piece.

[0008] The technical solution adopted by the embodiments of the present application is:

[0009] In a first aspect, a slurry supplement coating device is provided, comprising:

[0010] A first detection device is configured to detect the active material layer of the electrode pole piece to obtain slurry defect information of the active material layer;

[0011] A slurry supplement coating device is in communication connection with the first detection device and is configured to supplement the slurry of the slurry defect position of the active material layer according to the slurry defect information.

[0012] The slurry supplementing and coating device of the embodiment of the present application comprises a first detection device and a slurry supplementing and coating device, wherein the first detection device is configured to detect the active material layer of the electrode tab, so as to obtain the slurry defect information of the active material layer; the slurry supplementing and coating device is communicatively connected with the first detection device, and is configured to supplement and coat the slurry on the slurry defect position of the active material layer according to the slurry defect information obtained by the first detection device. In this way, the first detection device and the slurry supplementing and coating device work cooperatively, so that the mechanical supplementing and coating of the slurry on the slurry defect position of the active material layer of the electrode tab can be realized, so that the slurry defect position of the active material layer is filled with the slurry, and the electrode tab with the slurry defect of the active material layer can be normally used, thereby effectively alleviating the problems of material and labor waste. In addition, the slurry supplementing and coating device of the active material layer can also be integrated into each process of the production process of the electrode tab, so as to realize the real-time and dynamic detection and slurry supplementing and coating on each electrode tab in different states (such as a large roll-shaped electrode tab, a single film area roll material obtained after pre-cutting, a small roll-shaped electrode tab obtained after die cutting and slitting, etc.) obtained in each process, so as to improve the yield of the electrode tab, and further improve the production efficiency of the electrode tab.

[0013] In some embodiments, the first detection device comprises at least one of a camera detection device, a laser detection device, an infrared detection device, an X-ray detection device, and an ultrasonic detection device.

[0014] By using the technical scheme of the embodiment, any one of the camera detection device, the laser detection device, the infrared detection device, the X-ray detection device, and the ultrasonic detection device can be used to detect the active material layer of the electrode tab, so as to obtain the slurry defect information of the active material layer.

[0015] In some embodiments, the first detection device is a CCD vision detector or a 3D profile instrument.

[0016] By using the technical scheme of the embodiment, the CCD vision detector or the 3D profile instrument is used for visual detection of the active material layer of the electrode tab, so as to obtain the slurry defect information of the active material layer.

[0017] In some embodiments, the slurry supplementing and coating device comprises a displacement driving mechanism and a slurry supplementing and coating mechanism, both of which are communicatively connected with the first detection device, and the displacement driving mechanism is drivingly connected with the slurry supplementing and coating mechanism, so as to drive the slurry supplementing and coating mechanism to move and supplement and coat the slurry on the slurry defect position.

[0018] By using the technical scheme of the embodiment, the displacement driving component drives the slurry supplementing and coating mechanism to move according to the slurry defect information of the first detection device, and the slurry supplementing and coating mechanism supplements and coats the slurry on the slurry defect position of the active material layer according to the slurry defect information.

[0019] In some embodiments, the slurry coating device further comprises a slurry supply device, the slurry coating mechanism comprises a slurry delivery pump and a coating head mounted at an outlet of the slurry delivery pump, the slurry delivery pump is configured to deliver slurry from the slurry supply device to the coating head, and the displacement driving mechanism is drivingly connected with the coating head.

[0020] By adopting the technical scheme of this embodiment, the slurry delivery pump delivers slurry from the slurry supply device to the coating head, and the displacement driving mechanism drives the coating head to move according to the slurry coating information, so as to complete the slurry coating of the slurry defect position.

[0021] In some embodiments, the coating head comprises at least one of an extrusion head and a spraying head.

[0022] By adopting the technical scheme of this embodiment, the slurry is uniformly coated on the slurry defect position by using the extrusion head to extrude the slurry, or the slurry is sprayed to the slurry defect position by using the spraying head.

[0023] In some embodiments, the slurry coating mechanism comprises a 3D printer.

[0024] By adopting the technical scheme of this embodiment, the slurry is coated by using the 3D printing technology, the slurry is delivered into a material cavity of the 3D printer for containing printing materials, the first detection device is communicatively connected with the 3D printer, and the 3D printer prints the slurry in the material cavity layer by layer and adds to the slurry defect position according to the slurry defect information, so as to realize the automatic coating of the slurry on the slurry defect position.

[0025] In some embodiments, the slurry coating device further comprises a feeding mechanism, the feeding mechanism is configured to sequentially deliver the electrode sheet to be coated with slurry to the first detection device and the slurry coating device.

[0026] By adopting the technical scheme of this embodiment, the feeding mechanism sequentially delivers the electrode sheet to the first detection device and the slurry coating device, the collection of the slurry defect information and the slurry coating are orderly performed, forming a streamlined operation, which helps to improve the slurry coating efficiency of the electrode sheet.

[0027] In some embodiments, the slurry coating device further comprises a drying mechanism, the drying mechanism is configured to perform a drying operation on the electrode sheet after the slurry coating by the slurry coating device.

[0028] By adopting the technical scheme of this embodiment, the electrode sheet after the slurry coating is subjected to a drying operation, and a dried electrode sheet is obtained.

[0029] In some embodiments, the slurry coating device further comprises a second detection device, the second detection device is configured to detect the active material layer of the electrode sheet after the drying operation by the drying mechanism.

[0030] By adopting the technical scheme of the embodiment, the electrode tab is detected by the second detection device after being coated with the slurry and dried, so as to determine whether the active material layer of the electrode tab still has slurry defects. For the electrode tab still having slurry defects, the slurry coating device can be used for further slurry coating. For the electrode tab without slurry defects detected by the second detection device, the electrode tab can be subjected to material collection treatment.

[0031] In some embodiments, the first detection device and the second detection device have the same structure.

[0032] By adopting the technical scheme of the embodiment, the electrode tab is detected by the second detection device after being coated with the slurry and dried, so as to determine whether the active material layer of the electrode tab still has slurry defects. For the electrode tab still having slurry defects, the slurry coating device can be used for further slurry coating. For the electrode tab without slurry defects detected by the second detection device, the electrode tab can be subjected to material collection treatment.

[0033] In some embodiments, the first detection device, the slurry coating device, the drying mechanism and the second detection device are sequentially arranged along the feeding direction of the feeding mechanism.

[0034] By adopting the technical scheme of the embodiment, the electrode tab is detected by the second detection device after being coated with the slurry and dried, so as to determine whether the active material layer of the electrode tab still has slurry defects. For the electrode tab still having slurry defects, the slurry coating device can be used for further slurry coating. For the electrode tab without slurry defects detected by the second detection device, the electrode tab can be subjected to material collection treatment.

[0035] In some embodiments, the slurry coating device comprises:

[0036] Two first detection devices are arranged at the side portions of the opposite surfaces of the electrode tab, and are respectively configured to detect the active material layers of the opposite surfaces of the electrode tab.

[0037] Two slurry coating devices are arranged at the side portions of the opposite surfaces of the electrode tab, and are respectively configured to coat the active material layers of the opposite surfaces of the electrode tab with the slurry.

[0038] By adopting the technical scheme of the embodiment, two first detection devices are arranged to detect the active material layers on the opposite two side surfaces of the electrode tab, and the two first detection devices can be arranged at intervals along the conveying direction of the electrode tab. Meanwhile, two slurry supplementing devices are arranged to supplement slurry to the active material layers on the opposite two side surfaces of the electrode tab, and the two slurry supplementing devices can be arranged at intervals along the conveying direction of the electrode tab. In this way, since the opposite two surfaces of the electrode tab are both provided with the active material layer, one first detection device and one slurry supplementing device are sequentially arranged to detect and supplement slurry to the active material layer on one side surface of the electrode tab, and another first detection device and another slurry supplementing device are sequentially arranged to detect and supplement slurry to the active material layer on the opposite side surface of the electrode tab, so that the slurry supplementing operations of the active material layers on the opposite two sides of the electrode tab do not interfere with each other, and the effect of slurry supplementing can be further improved.

[0039] In a second aspect, a slurry supplementing method for an electrode tab is provided, which comprises:

[0040] detecting the active material layer of the electrode tab to obtain slurry defect information of the active material layer;

[0041] supplementing slurry to the slurry defect position of the active material layer according to the slurry defect information.

[0042] The slurry supplementing method for the electrode tab provided in the embodiments of the present application can detect the active material layer of the electrode tab to obtain slurry defect information of the active material layer, and then supplement slurry to the slurry defect position of the active material layer, so that the slurry defect position of the active material layer of the electrode tab is filled with slurry, and the electrode tab with slurry defect in the active material layer can be normally used, which effectively alleviates the problems of material and labor waste, and helps to improve the yield of the electrode tab.

[0043] In a third aspect, an electrode tab production system is provided, which comprises the slurry supplementing device described above and / or adopts the slurry supplementing method described above.

[0044] The electrode tab production system provided in the embodiments of the present application can integrate the slurry supplementing device and / or the slurry supplementing method for the active material layer into each process of the production process of the electrode tab, and perform real-time dynamic detection and slurry supplementing on each electrode tab in different states (such as a large roll-shaped electrode tab, a single film area roll material obtained after pre-cutting, a small roll-shaped electrode tab obtained after die cutting and slitting, etc.) obtained in each process, so that the yield of the electrode tab can be improved, and the production efficiency of the electrode tab can be improved.

[0045] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0047] Fig. 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0048] Fig. 2 is a sectional structural schematic diagram of an electrode tab according to an embodiment of the present application;

[0049] Fig. 3 is a structural schematic diagram of a slurry re-coating device according to an embodiment of the present application;

[0050] Fig. 4 is a front structural schematic diagram of the slurry re-coating device shown in Fig. 3;

[0051] Fig. 5 is a structural schematic diagram of a slurry re-coating device of the slurry re-coating device shown in Fig. 3;

[0052] Fig. 6 is an enlarged view of A in Fig. 4;

[0053] Fig. 7 is a structural schematic diagram of a slurry supply device of the slurry re-coating device shown in Fig. 3;

[0054] Fig. 8 is a flowchart of a slurry re-coating method of an electrode tab according to an embodiment of the present application;

[0055] Fig. 9 is a flowchart of a slurry re-coating method of an electrode tab according to another embodiment of the present application;

[0056] Fig. 10 is a flowchart of a slurry re-coating method of an electrode tab according to still another embodiment of the present application;

[0057] Fig. 11 is a flowchart of a slurry re-coating method of an electrode tab according to still another embodiment of the present application;

[0058] Fig. 12 is a flowchart of a slurry re-coating method of an electrode tab according to still another embodiment of the present application.

[0059] In the figure, reference numerals: 1, battery; 2, controller; 3, motor; 10, electrode tab; 11, current collector; 12, active material layer; 121, front paste layer; 122, back paste layer; 20, first detection device; 30, paste re-coating device; 31, displacement driving mechanism; 311, first driving member; 312, second driving member; 313, third driving member; 314, guide rail; 315, sliding block; 316, motor; 32, paste re-coating mechanism; 321, paste delivery pump; 322, re-coating head; 40, feeding mechanism; 41, first roller; 42, second roller; 50, drying mechanism; 51, oven; 511, box body; 512, feeding hole; 513, discharging hole; 514, heat dissipation hole; 515, exhaust fan; 60, second detection device; 70, paste supply device; 71, stirring tank; 72, stirring motor; 73, feeding port; 74, discharging port; 75, discharging valve. DETAILED DESCRIPTION

[0060] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings 1 to 12 and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, and are not intended to limit the present application.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the present specification and claims and the aforementioned description of the drawings, the terms "comprising" and "having" and any variations thereof, are intended to cover not exclusively inclusive.

[0062] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0063] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least some embodiments of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined in any suitable manner with other embodiments.

[0064] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.

[0065] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces). The meaning of "several" is one or more, unless otherwise explicitly specified.

[0066] In the description of the embodiments of the present 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" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0067] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0068] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0069] In the related art, a battery cell generally includes an electrode assembly composed of a positive electrode tab, a negative electrode tab, and a separator. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The positive electrode tab and the negative electrode tab can be collectively referred to as an electrode tab, the positive electrode current collector and the negative electrode current collector are collectively referred to as a current collector, and the positive electrode active material layer and the negative electrode active material layer are collectively referred to as an active material layer.

[0070] Generally, the generation process of the electrode tab is roughly as follows: first, a current collector is prepared, then electrode slurry is coated on the upper and lower surfaces of the current collector, and finally the coated electrode slurry is dried to form a large roll-shaped electrode tab with active material layers on both upper and lower surfaces. In the subsequent battery production process, the large roll-shaped electrode tab also needs to be pre-cut into single-film area roll stock, and finally the single-film area roll stock is obtained by die cutting and slitting, and the small roll-shaped electrode tab obtained after die cutting and slitting is formed into an electrode assembly by winding or stacking.

[0071] In the manufacturing process of the electrode tab, such as slurry coating, slurry drying, large roll cutting, and die cutting and slitting, the active material layer is prone to be missing, scratched, or have bubbles due to various reasons. The missing and scratched active material layer will cause the active material layer of the electrode tab to have obvious defects, and when there are bubbles, the electrode tab will also be damaged during the drying process, which will also cause the active material layer to have defects. On the one hand, the defects of the active material layer will reduce the output power of the battery (the output power of the battery refers to the output current and voltage of the battery under certain working conditions, which is an important indicator to measure the performance of the battery), and shorten the service life of the battery. For example, the uneven surface of the electrode tab caused by missing, scratching, bubbles, and bubble explosion will increase the internal resistance and current density of the battery, thereby affecting the conductivity and stability of the battery, resulting in a decrease in the output power of the battery. In addition, the defects of the active material layer will also affect the tightness and conductivity of the active material layer (positive electrode active material layer and negative electrode active material layer), causing uneven distribution of active materials in the active material layer, thereby affecting the capacity of the battery, causing the battery to be prone to deformation or cracking during charging and discharging, and seriously shortening the service life of the battery. On the other hand, the defects of the active material layer will also cause the imbalance of the battery, thereby causing the performance of the battery to be unstable, increasing the risk of thermal runaway of the battery.

[0072] However, the current electrode tab production process cannot well avoid the above problems. The electrode tab with the defective active material layer can only be removed through quality inspection and cannot be normally used, thereby causing waste of labor and materials.

[0073] Therefore, based on this, the embodiments of the present application provide a slurry supplementing and coating device. The device comprises a first detection device and a slurry supplementing and coating device. The first detection device detects the active material layer of the electrode tab, thereby obtaining the slurry defect information of the active material layer. The slurry supplementing and coating device is communicatively connected with the first detection device and supplements and coats the slurry on the slurry defect position of the active material layer according to the slurry defect information obtained by the first detection device. The first detection device and the slurry supplementing and coating device work cooperatively, which can realize mechanical supplementing and coating of the slurry on the slurry defect position of the active material layer of the electrode tab, thereby filling the slurry on the defect position of the active material layer. The electrode tab with the defective active material layer can be normally used, thereby effectively alleviating the problem of waste of materials and labor.

[0074] The technical solution described in the embodiments of the present application is suitable for supplementing and coating the slurry on the defects such as missing coating, scratches and bubbles existing in the active material layer of the electrode tab, thereby obtaining the electrode tab with the complete and uniform active material layer. The obtained electrode tab can be used in a battery monomer. The battery monomer can be used in a battery and an electric device using the battery.

[0075] The battery can be widely used in various electronic devices, including mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircrafts, electric ships, electric toy cars, electric toy ships, electric toy aircrafts and electric tools, etc. The battery is a device capable of storing and releasing electric energy, providing the required power for these electronic devices. The battery can also be an energy storage device. The energy storage device includes energy storage containers, energy storage cabinets, etc.

[0076] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric car toy, an electric ship toy and an electric aircraft toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, a power drill, a power grinder, a power wrench, a power screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc.

[0077] The following embodiments take a vehicle as an example for convenience of description.

[0078] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle is internally provided with a battery 1, which can be arranged at the bottom, the head, or the tail of the vehicle. The battery 1 is used to supply power to the vehicle, for example, the battery 1 can be used as an operating power supply of the vehicle. The vehicle can further include a controller 2 and a motor 3, and the controller 2 is used to control the battery 1 to supply power to the motor 3, for example, to meet the power demand of the vehicle during starting, navigation, and driving.

[0079] In the embodiments of the present application, the battery 1 can not only be used as an operating power supply of the vehicle, but also be used as a driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0080] In the battery 1, the battery monomers can be multiple, and the multiple battery monomers can be connected in series, in parallel, or in a mixed connection. The mixed connection means that there are both series connection and parallel connection among the multiple battery monomers.

[0081] In an embodiment, the multiple battery monomers can be directly connected in series, in parallel, or in a mixed connection, and the whole formed by the multiple battery monomers is accommodated therein. Of course, the battery 1 can also be that the multiple battery monomers are first connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated therein. The battery 1 can further include other structures, for example, the battery 1 can further include a current combing component, which is used to realize the electrical connection among the multiple battery monomers.

[0082] Each battery monomer can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0083] The battery monomer in the embodiments of the present application includes an electrode assembly and a shell, and the electrode assembly is installed in the shell to protect the electrode assembly by the shell.

[0084] The electrode assembly is composed of a positive electrode tab, a negative electrode tab and a separator. The electrode assembly mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the part of the positive electrode current collector which is not coated with the positive electrode active material layer protrudes from the part which is coated with the positive electrode active material layer, and the part which is not coated with the positive electrode active material layer serves as a positive electrode tab, or a metal conductor is welded on the positive electrode current collector and led out as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the part of the negative electrode current collector which is not coated with the negative electrode active material layer protrudes from the part which is coated with the negative electrode active material layer, and the part which is not coated with the negative electrode active material layer serves as a negative electrode tab, or a metal conductor is welded on the negative electrode current collector and led out as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. When the battery cell is charged, the current converts electrical energy into chemical energy and stores it in the battery cell through the chemical reaction between the electrolyte and the electrode assembly, and in the discharging process, the chemical energy is converted into electrical energy and released.

[0085] Hereinafter, the slurry recoating equipment of the present application will be described in detail in combination with the drawings 2 to 7 and specific embodiments.

[0086] In the embodiment of the present application, as shown in FIGS. 2 to 4, the slurry recoating equipment includes a first detection device 20 and a slurry recoating device 30. The first detection device 20 is configured to detect the active material layer 12 of the electrode tab 10 to obtain the slurry defect information of the active material layer 12; the slurry recoating device 30 is in communication connection with the first detection device 20, and is configured to recoat the slurry defect position of the active material layer 12 according to the slurry defect information.

[0087] It should be noted that in the present embodiment, the first detection device 20 is configured to detect the active material layer 12 of the electrode tab 10 to obtain the slurry defect information of the active material layer 12, which means that the first detection device 20 is an image detection mechanism, which detects the image of the active material layer 12 of the electrode tab 10 through machine vision to obtain the information of the active material layer 12, and the first detection device 20 stores preset information of the active material layer 12, such as the profile information, the thickness information, the area density (mass per unit area of the material of a specified thickness) information and the roughness information of the active material layer 12, etc. The preset information is the information of the standard active material layer 12 that meets the use requirements, and the first detection device 20 compares the detected information with the preset information stored in the device to obtain the slurry defect information of the active material layer 12. The slurry defect information means that the first detection device 20 compares the information of the active material layer 12 obtained by detection with the preset information to obtain the difference information. For example, the first detection device 20 detects the thickness value of the slurry at the slurry defect position and the area value corresponding to the profile of the slurry defect position, compares the thickness value and the area value with the preset thickness value and area value one by one, and calculates the thickness difference and the area difference, which correspond to the slurry defect information.

[0088] For example, the profile information and the thickness information of the standard active material layer 12 are input and stored in the first detection device 20 in advance, the first detection device 20 detects the active material layer 12 and obtains the profile information and the thickness information of the active material layer 12 in the current state, compares the detected profile information and thickness information with the preset information stored in advance, and when the detected information is consistent with the preset information, it indicates that the currently detected active material layer 12 does not have slurry defects, and when the detected information is inconsistent with the preset information, it indicates that the currently detected active material layer 12 has slurry defects. For example, when the active material layer 12 has a missing coating, a scratch or a bubble (the bubble bursts when drying, so the direct manifestation of the bubble on the active material layer 12 is that the bubble position has a missing coating of slurry), it will change the profile and thickness of the active material layer 12, so that the detected information is inconsistent with the preset information.

[0089] It should be noted that in the present embodiment, the communication connection between the slurry supplementing device 30 and the first detection device 20 means that the slurry supplementing device 30 and the first detection device 20 interact through the transmission of signals, and a communication is formed between the two, so that the signal transmission between the slurry supplementing device 30 and the first detection device 20 can be realized. Exemplarily, the communication connection between the slurry supplementing device 30 and the first detection device 20 can be wired communication connection, or wireless communication connection, or a central control device such as a computer or a PLC controller can be arranged to connect the slurry supplementing device 30 and the first detection device 20 respectively.

[0090] It should be noted that in the present embodiment, the slurry supplementing device 30 is configured to supplement the slurry to the slurry defect position of the active material layer 12 according to the slurry defect information, which means that the first detection device 20 compares the detected slurry defect information with the preset information, when the two are inconsistent, the slurry defect information is transmitted to the slurry supplementing device 30, and the slurry supplementing device 30 supplements the slurry to the slurry defect position of the active material layer 12 according to the obtained slurry defect information. Exemplarily, the first detection device 20 detects the thickness value of the slurry at the slurry defect position and the area value corresponding to the profile of the slurry defect position, compares the thickness value and the area value with the preset thickness value and area value one by one, and calculates the thickness difference and the area difference, the first detection device 20 transmits the thickness difference and the area difference to the slurry supplementing device 30 as the slurry defect information, and the slurry supplementing device 30 positions the slurry defect position according to the thickness difference and the area difference, and supplements the slurry to the slurry defect position again, so that the slurry fills the profile of the slurry defect position, and the thickness of the slurry at the slurry defect position is equal to the preset thickness. Alternatively, the first detection device 20 and the slurry supplementing device 30 are communicatively connected through a central control device, the first detection device 20 transmits the thickness value of the slurry at the slurry defect position and the area value corresponding to the profile of the slurry defect position to the central control device, the central control device compares the thickness value and the area value with the preset thickness value and area value one by one, and calculates the thickness difference and the area difference, and the central control device transmits the thickness difference and the area difference to the slurry supplementing device 30 as the slurry defect information, and the slurry supplementing device 30 supplements the slurry to the slurry defect position according to the thickness difference and the area difference.

[0091] The slurry coating equipment of the embodiment of the present application comprises a first detection device 20 and a slurry coating device 30, wherein the first detection device 20 is used to detect the active material layer 12 of the electrode tab 10, so as to obtain the slurry defect information of the active material layer 12, the slurry coating device 30 is in communication connection with the first detection device 20, and is used to perform slurry coating on the slurry defect position of the active material layer 12 according to the slurry defect information obtained by the first detection device 20. In this way, the first detection device 20 and the slurry coating device 30 work cooperatively, so that the mechanical coating of the slurry defect position of the active material layer 12 of the electrode tab 10 can be realized, so that the slurry defect position of the active material layer 12 is filled with slurry, and the electrode tab 10 with slurry defects in the active material layer 12 can be normally used, effectively alleviating the problems of material and labor waste. In addition, the slurry coating equipment can also be integrated into each process of the production process of the electrode tab 10, and real-time dynamic detection and slurry coating can be performed on the electrode tabs 10 in different states (such as large roll-shaped electrode tabs, single-film area roll materials obtained after pre-cutting, small roll-shaped electrode tabs obtained after die cutting and slitting, etc.) processed in each process, so that the yield of the electrode tab 10 can be improved, and the production efficiency of the electrode tab 10 can be improved.

[0092] In some embodiments, the first detection device 20 comprises at least one of a camera detection device, a laser detection device, an infrared detection device, and an ultrasonic detection device.

[0093] In the embodiment, the first detection device 20 can adopt any one of a camera detection device, a laser detection device, an infrared detection device, an X-ray detection device, and an ultrasonic detection device. Any one of the camera detection device, the laser detection device, the infrared detection device, and the ultrasonic detection device can be used to detect the active material layer 12 of the electrode tab 10, so as to obtain the slurry defect information of the active material layer 12.

[0094] In some embodiments, the first detection device 20 can adopt a camera detection device, which is one of the relatively mature and commonly used detection devices. The camera detection device collects the image of an object through an optical sensor, and extracts feature information such as contour, thickness, texture, rough group, color, etc. through an image processing algorithm, so as to realize the detection, recognition and analysis of the object.

[0095] In the present embodiment, the camera detection device collects images of the active material layer 12 of the electrode tab 10 through an optical sensor, and extracts feature information of the active material layer 12 through an image processing algorithm, which includes but is not limited to contour information, thickness information, areal density information, and roughness information, etc. For example, the camera detection device extracts thickness information of the active material layer 12, and compares the detected thickness information with preset thickness information to calculate a difference value of the thickness information, or extracts contour information of the active material layer 12, and compares the detected contour information with preset contour information to calculate a difference value of the area of the contour, etc.

[0096] In another embodiment, the first detection device 20 can employ a laser detection device, which uses a laser beam to scan the object and obtains the shape and surface features of the object by measuring the reflection or scattering of the laser beam. The laser detection device has the characteristics of high precision, non-contact and high speed, and is widely used in the fields of three-dimensional detection, contour detection and surface defect detection, etc.

[0097] In the present embodiment, the laser detection device collects images of the active material layer 12 of the electrode tab 10 through the reflection or scattering of the laser beam, and extracts feature information of the active material layer 12 through an image processing algorithm, which includes but is not limited to contour information, thickness information, areal density information, and roughness information, etc.

[0098] In other embodiments, the first detection device 20 can employ an infrared detection device, which uses infrared light to scan the object and obtains the thermal characteristics and infrared images of the object by measuring the infrared radiation or reflection. In the present embodiment, the infrared detection device collects images of the active material layer 12 of the electrode tab 10 through the infrared radiation or reflection, and extracts feature information of the active material layer 12 through an image processing algorithm, which includes but is not limited to contour information, thickness information, areal density information, and roughness information, etc.

[0099] In some embodiments, the first detection device 20 can employ an X-ray detection device, which uses X-rays to penetrate the object and obtains the internal structure and composition information of the object by measuring the absorption and scattering of X-rays. In the present embodiment, the X-ray detection device collects images of the active material layer 12 of the electrode tab 10 through the absorption and scattering of X-rays, and extracts feature information of the active material layer 12 through an image processing algorithm, which includes but is not limited to contour information, thickness information, areal density information, and roughness information, etc.

[0100] In other embodiments, the first detection device 20 can also adopt an ultrasonic detection device, which uses ultrasonic beams to scan objects and obtains internal structure and defect information of the objects by measuring the propagation speed and reflection intensity of the ultrasonic waves. In this embodiment, the ultrasonic detection device collects images of the active material layer 12 of the electrode tab 10 through the propagation speed and reflection intensity of the ultrasonic waves, and extracts feature information of the active material layer 12 through an image processing algorithm, which includes but is not limited to contour information, thickness information, surface density information, roughness information, etc.

[0101] In some embodiments, the first detection device 20 is a CCD visual detection instrument or a 3D profiler.

[0102] By using the CCD visual detection instrument or the 3D profiler to visually detect the active material layer 12 of the electrode tab 10, the slurry defect information of the active material layer 12 can be obtained.

[0103] In specific implementation, the first detection device can adopt a CCD visual detection instrument, which is an instrument that detects the appearance of an object through a display by using a CCD component. The machine vision detection system of the CCD detection device has a measurement function and can automatically measure the appearance size of the active material layer 12, such as the measurement of contour, area, thickness, aperture, etc. Therefore, by using the CCD detection device to visually detect the active material layer 12 of the electrode tab 10, the slurry defect information of the active material layer 12 can be obtained.

[0104] In other embodiments, the first detection device 20 can adopt a 3D profiler, which is a high-precision measuring instrument. The 3D profiler uses the principle of laser triangulation, projects a laser plane from a laser emitter to the surface of the object to be measured, and the reflected laser light passes through the lens and is collected by the image sensor. Subsequently, the 3D shape of the object to be measured is reconstructed by image processing of the image data collected by the image sensor, so as to realize high-precision measurement and detection. Therefore, by using the 3D profiler to visually detect the active material layer 12 of the electrode tab 10, the slurry defect information of the active material layer 12 can be obtained.

[0105] In some embodiments, as shown in FIGS. 3 to 5, the slurry coating device 30 includes a displacement driving mechanism 31 and a slurry coating mechanism 32, both of which are in communication connection with the first detection device 20. The displacement driving mechanism 31 is drivingly connected with the slurry coating mechanism 32 to drive the slurry coating mechanism 32 to move and perform slurry coating on the slurry defect position.

[0106] Thus, the displacement driving assembly drives the slurry coating mechanism 32 to move according to the slurry defect information of the first detection device 20, and the slurry coating mechanism 32 performs slurry coating on the slurry defect position of the active material layer 12 according to the slurry defect information, so that the slurry coating on the slurry defect position is realized.

[0107] It should be noted that:

[0108] The communication connection between the displacement driving mechanism 31 and the first detection device 20 means that the displacement driving mechanism 31 and the first detection device 20 interact through signal transmission, and a communication is formed between them, so that the signal transmission between the displacement driving mechanism 31 and the first detection device 20 can be realized. Exemplarily, the communication connection between the displacement driving mechanism 31 and the first detection device 20 can be wired communication connection, or wireless communication connection, or a central control device such as a computer or a PLC controller can be arranged to connect the displacement driving mechanism 31 and the first detection device 20 respectively.

[0109] The displacement driving mechanism 31 drives the slurry coating mechanism 32 to move means that the displacement driving mechanism 31 drives the slurry coating mechanism 32 to move according to the slurry defect information transmitted by the first detection device 20. Exemplarily, the first detection device 20 converts the slurry defect information into coordinate or distance information, and the displacement driving mechanism 31 drives the slurry coating mechanism 32 to move according to the coordinate information or distance information.

[0110] The communication connection between the slurry coating mechanism 32 and the first detection device 20 means that the slurry coating mechanism 32 and the first detection device 20 interact through signal transmission, and a communication is formed between them, so that the signal transmission between the slurry coating mechanism 32 and the first detection device 20 can be realized. Exemplarily, the communication connection between the slurry coating mechanism 32 and the first detection device 20 can be wired communication connection, or wireless communication connection, or a central control device such as a computer or a PLC controller can be arranged to connect the slurry coating mechanism 32 and the first detection device 20 respectively.

[0111] The slurry coating mechanism 32 moves and performs slurry coating on the slurry defect position means that the slurry coating mechanism 32 performs slurry coating on the slurry defect position according to the slurry defect information transmitted by the first detection device 20. Exemplarily, the first detection device 20 converts the slurry defect information into area difference and thickness difference, and the slurry coating mechanism 32 moves and performs slurry coating under the driving of the displacement driving mechanism 31 according to the area difference and the thickness difference.

[0112] In some embodiments, as shown in FIG. 4 and FIG. 5, the displacement driving mechanism 31 comprises a first driving member 311, a second driving member 312 and a third driving member 313, wherein the slurry coating mechanism 32 is installed on the driving end of the third driving member 313, the third driving member 313 is installed on the driving end of the second driving member 312, the second driving member 312 is installed on the driving end of the first driving member 311, the first driving member 311 drives the second driving member 312, the third driving member 313 and the slurry coating mechanism 32 to reciprocate along the X direction, the second driving member 312 drives the first driving member 311 and the slurry coating mechanism 32 to reciprocate along the Y direction, and the third driving member 313 drives the slurry coating mechanism 32 to reciprocate along the Z direction, so that the slurry coating mechanism 32 can be driven to move in three-dimensional space through the cooperation of the first driving member 311, the second driving member 312 and the third driving member 313, so as to realize the slurry coating of the sauce loss part at any position. The X direction, the Y direction and the Z direction are perpendicular to each other, and the X direction, the Y direction and the Z direction are shown in the coordinate system in FIG. 4 as the directions of arrows F1, F2 and F3.

[0113] In specific embodiments, as shown in FIG. 4 and FIG. 5, the first driving member 311, the second driving member 312 and the third driving member 313 can adopt a linear module, which comprises a rotatable screw rod arranged along the driving direction, a displacement nut threadedly connected to the screw rod, a sliding block 315 fixedly connected to the displacement nut and connected to the driving part as the driving end, and a motor 316 connected to one end of the screw rod, so that the motor 316 operates to drive the screw rod to rotate, drive the displacement nut to move linearly along the driving direction, and the driving part fixed to the sliding plate can realize linear motion, as shown in FIG. 5. Generally, the first driving member 311, the second driving member 312 and the third driving member 313 each further comprise a slide rail for guiding and supporting, and the sliding plate and the sliding block 315 are adapted for sliding connection, thereby guiding the movement of the driving part.

[0114] Exemplarily, as shown in FIG. 5, the first driving member 311 comprises a guide rail 314 extending along the X direction, a sliding block 315 slidingly installed on the guide rail 314, a motor 316 installed on the guide rail 314, and a rotatable screw rod installed on the guide rail 314 respectively, a displacement nut threadedly connected to the screw rod, the second driving member 312 slidingly installed on the guide rail 314 through the sliding block 315, the sliding block 315 threadedly connected to the screw rod through the displacement nut, and the motor 316 connected to one end of the screw rod. When the motor 316 operates, the screw rod rotates, the displacement nut moves linearly along the X direction, the sliding block 315 moves linearly along the X direction, the second driving member 312 connected to the sliding block 315 moves along the X direction, and the third driving member 313 and the slurry recoating mechanism 32 move synchronously along the X direction. In specific embodiments, one sliding rail can be provided, or two sliding rails can be provided at intervals along the Y direction, and the second driving member 312 is slidingly connected to the two sliding rails through the two sliding blocks 315 respectively.

[0115] It can be understood that when the second driving member 312 and the third driving member 313 are linear modules, they can have similar structures as the first driving member 311, which will not be described here.

[0116] In other embodiments, the first driving member 311, the second driving member 312 and the third driving member 313 can also be X-direction driving members, Y-direction driving members and Z-direction driving members of a three-dimensional mechanical arm, i.e., the first driving member 311, the second driving member 312 and the third driving member 313 are integrated into a mechanical arm structure, the mechanical arm can at least realize free movement in the X direction, the Y direction and the Z direction, and the slurry recoating mechanism 32 is installed on the output end of the mechanical arm. Alternatively, in other more embodiments, the first driving member 311, the second driving member 312 and the third driving member 313 can also be driving members of other structural forms, and the specific structures of the first driving member 311, the second driving member 312 and the third driving member 313 are not uniquely limited here.

[0117] In some embodiments, as shown in FIGS. 4, 5 and 7, the slurry recoating device further comprises a slurry supply device 70, the slurry recoating mechanism 32 comprises a slurry delivery pump 321 and a recoating head 322 installed on the outlet of the slurry delivery pump 321, the slurry delivery pump 321 is configured to deliver slurry from the slurry supply device 70 to the recoating head 322, and the displacement driving mechanism 31 is drivingly connected to the recoating head 322.

[0118] Wherein, it can be understood that the driving connection between the displacement driving mechanism 31 and the repair head 322 means that the repair head 322 is installed on the power output end of the displacement driving mechanism 31. For example, when the displacement driving mechanism 31 includes the first driving member 311, the second driving member 312 and the third driving member 313 in the above embodiment, the repair head 322 is installed on the output end of the third driving member 313. When the third driving member 313 is a linear module, the repair head 322 is installed on the sliding block 315. Alternatively, when the displacement driving mechanism 31 is a three-dimensional mechanical arm, the repair head 322 is installed on the gripper position of the mechanical arm.

[0119] It should be noted that the slurry conveying pump 321 configured to convey the slurry from the slurry supply device 70 to the repair head 322 means that the slurry conveying pump 321 quantitatively pumps the slurry from the slurry supply device 70 according to the slurry defect information provided by the first detection device 20, and pressurizes and conveys the pumped slurry to the repair head 322 to output to the slurry defect position, thereby achieving slurry repair. Wherein, the slurry conveying pump 321 can be a high-precision screw pump or a small-flow centrifugal pump, etc.

[0120] In this embodiment, the slurry conveying pump 321 conveys the slurry from the slurry supply device 70 to the repair head 322, and the displacement driving mechanism 31 drives the repair head 322 to move according to the slurry repair information, thereby completing the slurry repair of the slurry defect position.

[0121] In some embodiments, the repair head 322 includes at least one of an extrusion discharge head and a spraying head.

[0122] In specific embodiments, the repair head 322 includes an extrusion discharge head. The extrusion discharge head provides an extrusion force through the slurry conveying pump 321 to extrude the slurry to the outlet of the extrusion discharge head, and the slurry is extruded and output. By controlling the extrusion force and the amount of slurry output in a single extrusion, the displacement driving mechanism 31 can be driven to move in a specific direction to achieve uniform layer-by-layer repair of the slurry defect position.

[0123] In some other embodiments, the repair head 322 includes a spraying head.

[0124] In this embodiment, the spraying head provides a pressure through the slurry conveying pump 321 to extrude the slurry to be sprayed from the spraying head, and the slurry is sprayed to the slurry defect position. By controlling the spraying pressure and the amount of slurry sprayed in a single spraying, the displacement driving mechanism 31 can be driven to move in a specific direction to achieve uniform layer-by-layer repair of the slurry defect position.

[0125] In other embodiments, the slurry repair device 30 is a 3D printer.

[0126] In the embodiment, the slurry is printed to the slurry defect site by the 3D printer to realize slurry recoating. In this way, the slurry is delivered to the material cavity of the 3D printer for slurry recoating by using the 3D printing technology. The first detection device 20 is communicatively connected with the 3D printer. The 3D printer prints the slurry in the material cavity layer by layer to the slurry defect site according to the slurry defect information, thereby realizing automatic slurry recoating of the slurry defect site. The 3D printing technology is a rapid prototyping technology, also known as additive manufacturing technology. The first detection device 20 is communicatively connected with the 3D printer and transmits the slurry defect information to the 3D printer. The 3D printer reads the obtained slurry defect information, such as the contour information and thickness information of the slurry defect site, to obtain the cross-sectional information of the slurry defect site. Then, the 3D printer prints the cross sections obtained by reading layer by layer to the slurry defect site by using the slurry in the material cavity, thereby completing the slurry recoating.

[0127] It can be understood that, in the embodiment, the displacement driving mechanism 31 and the slurry recoating mechanism 32 can be integrated, that is, the 3D printer itself is provided with the displacement driving mechanism 31 and the slurry recoating mechanism 32, and it is not necessary to provide a displacement driving mechanism 31 independent of the 3D printer to perform the driving action of printing, so that the equipment has high integration degree and is convenient for maintenance and management.

[0128] It can be understood that, in the above embodiment, the slurry feeding device 70 can be a slurry feeding device used in the pole piece production system, or can be a feeding device separately provided for feeding the slurry recoating device.

[0129] Exemplarily, the slurry feeding device 70 includes a stirring tank 71 for containing the slurry, a stirring paddle arranged in the stirring tank 71 and used for stirring the slurry, and a stirring motor 72 connected with the stirring paddle and used for driving the stirring paddle to rotate, etc. The stirring tank 71 is provided with a feeding port 73 and a discharging port 74. The material cavity of the 3D printer or the inlet of the slurry delivery pump 321 is in communication with the discharging port 74. The discharging port 74 is provided with a discharging valve 75 and a liquid level sensor. The liquid level sensor cooperates with the discharging valve 75 to quantitatively deliver the slurry to the material cavity of the 3D printer or the slurry delivery pump 321. The stirring paddle stirs the slurry to improve the activity of the slurry for recoating.

[0130] In some embodiments, as shown in FIGS. 3 and 4, the slurry recoating device further includes a feeding mechanism 40 configured to sequentially deliver the electrode pole piece 10 to be recoated with the slurry to the first detection device 20 and the slurry recoating device 30.

[0131] By adopting the technical scheme of the embodiment, the electrode tab 10 is moved by the feeding mechanism 40, when the electrode tab 10 passes through the first detection device 20, the first detection device 20 acquires the slurry defect information of the active material layer 12 of the electrode tab 10, after passing through the first detection device 20, the electrode tab 10 continues to move to the slurry coating device 30, the slurry coating device 30 performs slurry coating on the slurry defect position according to the slurry defect information provided by the first detection device 20, the feeding mechanism 40 sequentially transports the electrode tab 10 through the first detection device 20 and the slurry coating device 30, the acquisition of the slurry defect information and the slurry coating are orderly performed, forming a flow production, which is helpful to improve the slurry coating efficiency of the electrode tab 10.

[0132] In specific embodiments, as shown in FIGS. 4 and 5, the feeding mechanism 40 includes a plurality of transmission rollers driven by motors or air cylinders, etc., which are arranged along the conveying direction of the electrode tab 10 to roll and convey the electrode tab 10. For example, the feeding mechanism 40 includes a plurality of first rollers 41 and a plurality of second rollers 42, the plurality of first rollers 41 are arranged on one side of the electrode tab 10 along the conveying direction of the electrode tab 10 and roll and contact the side surface of the electrode tab 10, for example, the first rollers 41 are located on the side of the positive slurry layer of the electrode tab 10 and roll and contact the positive slurry layer, the plurality of second rollers 42 are arranged on the opposite side of the electrode tab 10 along the conveying direction of the electrode tab 10 and roll and contact the opposite side surface of the electrode tab 10, for example, the second rollers 42 are located on the side of the negative slurry layer of the electrode tab 10 and roll and contact the negative slurry layer, adjacent first rollers 41 and second rollers 42 are arranged along the direction perpendicular to the active material layer 12 of the electrode tab 10, in this way, the shafts of the first rollers 41 and the shafts of the second rollers 42 rotate in the same direction and at the same speed, so as to realize the transmission of the electrode tab 10. The conveying direction of the electrode tab 10 is along the direction indicated by the dashed arrow in FIG. 3.

[0133] In specific embodiments, along the conveying direction of the electrode tab 10, the first detection device 20 is arranged in front of the slurry coating device 30, in this way, the first detection device 20 first detects and acquires the slurry defect information of the active material layer 12 in a lengthwise region of the electrode tab 10, then the feeding mechanism 40 conveys the region to the slurry coating device 30, and the slurry coating device 30 performs slurry coating on the slurry defect position in the region. The lengthwise direction of the electrode tab 10 is in the same direction as the conveying direction of the electrode tab 10.

[0134] It can be understood that, in specific embodiments, the electrode tab 10 can be moved at a slow and uniform speed, the first detection device 20 detects the slurry defect information during the movement of the electrode tab 10, and the slurry coating device 30 also performs slurry coating on the slurry defect position during the movement of the electrode tab 10. The movement speed of the electrode tab 10, the detection speed of the first detection device 20, and the slurry coating speed of the slurry coating device 30 can be set and adjusted and controlled in real time as needed to achieve dynamic slurry coating. Of course, in other embodiments, the feeding mechanism 40 can also intermittently feed the electrode tab 10, the first detection device 20 detects the slurry defect information of the static electrode tab 10, and the slurry coating device 30 performs slurry coating on the static electrode tab 10.

[0135] In some embodiments, as shown in FIGS. 3, 4 and 6, the slurry coating device further comprises a drying mechanism 50 configured to perform a drying operation on the electrode tab 10 after the slurry coating by the slurry coating device 30. The drying mechanism 50 is used to dry the active material layer 12 after the slurry coating.

[0136] It should be noted that, in the present embodiment, the drying mechanism 50 configured to perform a drying operation on the electrode tab 10 after the slurry coating by the slurry coating device 30 means that after the active material layer 12 of the electrode tab 10 is coated with slurry by the slurry coating device 30, the drying mechanism 50 performs a drying operation on the electrode tab 10 coated with slurry. When performing the drying operation, the electrode tab 10 can enter the drying mechanism 50 as a whole or in part, and the parameters of the drying mechanism 50 for performing the drying operation can be set according to the amount of slurry coating to make the drying effect of the part of the active material layer 12 after the slurry coating consistent with the drying effect of the part of the active material layer 12 without the slurry coating. The drying mechanism 50 can be a device such as an oven 51, a furnace, etc. that dries the active material layer 12 by increasing the ambient temperature.

[0137] Exemplarily, as shown in FIG. 5 and FIG. 6, the drying mechanism 50 comprises a box body 511 and a heater installed in the box body 511, one end of the box body 511 is provided with an inlet hole 512 for the electrode tab 10 to pass in, the opposite end of the box body 511 is provided with an outlet hole 513 for the electrode tab 10 to pass out, the inlet hole 512 and the outlet hole 513 are arranged opposite along the conveying direction of the electrode tab 10, so that the electrode tab 10 can pass in from the inlet hole 512 and then pass out from the outlet hole 513 under the driving of the feeding mechanism 40, and a plurality of heat dissipation holes 514 are also formed in the box body 511, the heat dissipation holes 514 are in communication with the internal space of the box body 511, for dissipating the heat in the box body 511, so as to keep the temperature in the box body 511 relatively constant. A plurality of exhaust fans 515 are also provided on the box body 511, the exhaust fans 515 are installed on the side wall of the box body 511 at intervals, and the exhaust fans 515 are used for circulating the gas in the box body 511, so as to uniformly distribute the heat in the box body 511, keep the temperature in the box body 511 uniform, and provide guarantee for the drying effect of the electrode tab 10. In addition, the exhaust fans 515 can also be used for heat dissipation of the internal space of the box body 511, especially when the temperature in the box body 511 is too high and exceeds the temperature for drying the electrode tab 10, the exhaust fans 515 can be started to dissipate heat and reduce the temperature in the box body 511 in time.

[0138] In some embodiments, the slurry coating supplementing device further comprises a second detection device 60, which is configured to detect the active material layer 12 of the electrode tab 10 after being dried by the drying mechanism 50.

[0139] In the present embodiment, as shown in FIG. 3 and FIG. 4, after the electrode tab 10 is coated with slurry and dried, the second detection device 60 is used for detection, so as to determine whether the active material layer 12 of the electrode tab 10 still has slurry defects. For the electrode tab 10 still having slurry defects, the slurry coating supplementing device 30 can be used for further slurry coating supplementing, and for the electrode tab 10 without slurry defects detected by the second detection device 60, the electrode tab 10 can be subjected to material collection treatment.

[0140] It can be understood that the second detection device 60 is an image detection mechanism, which obtains information of the active material layer 12 by image detection of the active material layer 12 of the electrode tab 10. The second detection device 60 stores preset information of the active material layer 12, such as profile information, thickness information, surface density information and roughness information of the active material layer 12. The preset information is information of the standard active material layer 12 meeting the use requirement. The second detection device 60 compares the detected information with the preset information stored in the device, and when the comparison result is consistent, it indicates that the active material layer 12 of the current detected electrode tab 10 does not have slurry defects, and when the comparison result is inconsistent, it indicates that the active material layer 12 of the current detected electrode tab 10 still has slurry defects.

[0141] In some embodiments, the first detection device 20 and the second detection device 60 have the same structure.

[0142] In this way, the same structure of detection device is used to detect the electrode tab 10 before and after the paste supplement, the detection deviation between devices is small, the consistency of data detection of the same parameter is higher, and the paste supplement effect of the electrode tab 10 is improved.

[0143] For example, in specific embodiments, the first detection device 20 and the second detection device 60 can both use a CCD vision detector, or the first detection device 20 and the second detection device 60 can both use a 3D profile gauge.

[0144] It can be understood that when the first detection device 20 and the second detection device 60 have the same structure, i.e., the second detection device 60 can also obtain the paste defect information of the electrode tab 10, the second detection device 60 can also be in communication connection with the paste supplement device 30, and the electrode tab 10 can be directly conveyed to the paste supplement device 30 without passing through the first detection device 20 after being detected by the second detection device 60, and the paste supplement device 30 can perform paste supplement according to the paste defect information transmitted by the second detection device 60.

[0145] It should be noted that in other embodiments, the first detection device 20 and the second detection device 60 can also use different devices, and the detection of the active material layer 12 of the electrode tab 10 is accurate. For example, in specific embodiments, the second detection device 60 can be used only for image detection of the electrode tab 10 to determine whether the electrode tab 10 has paste defects, and does not need to have the ability to obtain paste defect information, i.e., the second detection device 60 only obtains the information of the active material layer 12 and compares it with the preset information of the active material layer 12 stored in the second detection device 60, without calculating the difference between the two information. When the second detection device 60 detects that the active material layer 12 of the electrode tab 10 has paste defects, the electrode tab 10 is conveyed to the first detection device 20, and the first detection device 20 detects and calculates the paste defect information again.

[0146] In some embodiments, as shown in FIGS. 3 and 4, the first detection device 20, the paste supplement device 30, the drying mechanism 50, and the second detection device 60 are sequentially arranged along the feeding direction of the feeding mechanism 40.

[0147] In this way, the electrode tab 10 sequentially passes through the first detection device 20, the slurry coating device 30, the drying mechanism 50 and the second detection device 60 along the conveying direction of the electrode tab 10, so that the slurry defect information detection, the slurry coating, the drying and the judgment of whether the electrode tab 10 still has the slurry defect are sequentially performed, so as to improve the efficiency and quality of the slurry coating of the electrode tab 10.

[0148] In some embodiments, as shown in FIGS. 3 and 4, the slurry coating device includes two first detection devices 20 and two slurry coating devices 30, wherein the two first detection devices 20 are respectively arranged at the side portions of the opposite surfaces of the electrode tab 10 and are respectively configured to detect the active material layer 12 of the opposite surfaces of the electrode tab 10, and the two slurry coating devices 30 are respectively arranged at the side portions of the opposite surfaces of the electrode tab 10 and are respectively configured to perform the slurry coating on the active material layer 12 of the opposite surfaces of the electrode tab 10.

[0149] In the present embodiment, the two first detection devices 20 are respectively arranged to detect the active material layer 12 of the opposite surfaces of the electrode tab 10, and the two first detection devices 20 can be arranged at intervals along the conveying direction of the electrode tab 10. Meanwhile, the two slurry coating devices 30 are respectively arranged to perform the slurry coating on the active material layer 12 of the opposite surfaces of the electrode tab 10, and the two slurry coating devices 30 can be arranged at intervals along the conveying direction of the electrode tab 10. In this way, since the opposite surfaces of the electrode tab 10 are both provided with the active material layer 12, i.e., the active material layer 12 of the electrode tab 10 includes the front slurry layer 121 and the back slurry layer 122 arranged at the opposite surfaces of the current collector 11, as shown in FIG. 2, a first detection device 20 and a slurry coating device 30 are sequentially arranged to detect and perform the slurry coating on the front slurry layer 121 of the electrode tab 10, and another first detection device 20 and another slurry coating device 30 are sequentially arranged to detect and perform the slurry coating on the back slurry layer 122 of the electrode tab 10, so that the slurry coating operations on the opposite surfaces of the electrode tab 10 do not interfere with each other, thereby further improving the effect of the slurry coating.

[0150] It can be understood that the drying mechanism 50 can also be arranged after the two slurry coating devices 30, wherein the front drying mechanism 50 is used to dry the front slurry layer 121 after the slurry coating, and the rear second detection device 60 is used to dry the back slurry layer 122 after the slurry coating.

[0151] It can be understood that the second detection device 60 can also be arranged after the two drying mechanisms 50, wherein the front second detection device 60 is used to detect and judge whether the front slurry layer 121 still has the slurry defect, and the rear second detection device 60 is used to detect and judge whether the back slurry layer 122 still has the slurry defect.

[0152] Exemplarily, in specific embodiments, as shown in FIG. 3 and FIG. 4, the first detection device 20, the slurry supplementing device 30, the drying mechanism 50, the second detection device 60, the first detection device 20, the slurry supplementing device 30, the drying mechanism 50 and the second detection device 60 are sequentially arranged along the conveying direction of the electrode tab 10, wherein the former four are used for slurry supplementing the front slurry layer 121 of the electrode tab 10, and the latter four are used for slurry supplementing the back slurry layer 122 of the electrode tab 10.

[0153] Referring to FIG. 4 and FIG. 8 to FIG. 12, another embodiment of the present application further provides a slurry supplementing method of an electrode tab 10, comprising the following steps:

[0154] S10, detecting the active material layer 12 of the electrode tab 10 to obtain slurry defect information of the active material layer 12;

[0155] S10, supplementing slurry to the slurry defect position of the active material layer 12 according to the slurry defect information.

[0156] It should be noted that:

[0157] In step S10, detecting the active material layer 12 of the electrode tab 10 to obtain slurry defect information of the active material layer 12 means that the image detection device or the like can be used to detect the image of the active material layer 12 of the electrode tab 10, so as to obtain the information of the active material layer 12. The image detection device or the like stores preset information of the active material layer 12, such as the profile information, the thickness information, the surface density information and the roughness information of the active material layer 12. The preset information is the information of the standard active material layer 12 that meets the use requirements. The image detection device or the like compares the detected information with the preset information stored in the device, so as to obtain the slurry defect information of the active material layer 12. The slurry defect information is basically the same as the slurry defect information in each of the above embodiments.

[0158] Exemplarily, in specific embodiments, the first detection device 20 in each of the above embodiments can be used to detect the image of the active material layer 12 of the electrode tab 10, so as to obtain the slurry defect information of the active material layer 12.

[0159] In step S20, the slurry filling of the slurry defect position of the active material layer 12 according to the slurry defect information refers to that the detection device transmits the slurry defect information to the slurry filling device 30, and the slurry filling device 30 fills the slurry to the slurry defect position of the active material layer 12 according to the obtained slurry defect information. For example, the slurry filling device 30 in each of the above embodiments can be used to fill the slurry to the slurry defect position, for example, when the first detection device 20 in any of the above embodiments is used to obtain the slurry defect information, the first detection device 20 transmits the detected slurry defect information to the slurry filling device 30, and the slurry filling device 30 fills the slurry to the slurry defect position according to the slurry defect information transmitted by the first detection device 20, so that the slurry fills the outline of the slurry defect position and the thickness of the slurry defect position is equal to the preset thickness.

[0160] For example, in specific embodiments, the profile, thickness, surface density and surface roughness of the active material layer 12 can be detected by using a camera detection device, a laser detection device, an infrared detection device, an X-ray detection device and an ultrasonic detection device.

[0161] The slurry filling method of the electrode tab of the embodiment of the present application detects the active material layer 12 of the electrode tab 10 to obtain the slurry defect information of the active material layer 12, and then fills the slurry to the slurry defect position of the active material layer 12, so that the slurry defect position of the active material layer 12 of the electrode tab 10 is filled with the slurry, and the electrode tab 10 with the slurry defect of the active material layer 12 can be normally used, which effectively alleviates the waste of materials and manpower and helps to improve the yield of the electrode tab 10.

[0162] In some embodiments, in step S10, detecting the active material layer 12 of the electrode tab 10 at least includes detecting one or more of the profile, thickness, surface density and surface roughness of the active material layer 12.

[0163] By detecting one or more of the profile, thickness, surface density and surface roughness of the active material layer 12, the slurry defect information of the active material layer 12 is obtained.

[0164] In some embodiments, in step S10, obtaining the slurry defect information of the active material layer 12 includes at least obtaining the profile information and the thickness information of the slurry defect position of the active material layer 12.

[0165] By detecting the profile information and the thickness information of the active material layer 12, and comparing the acquired profile information and thickness information with preset information, the slurry defect information of the active material layer 12 can be obtained. For the slurry defect, by determining the area corresponding to the profile of the slurry defect position and the slurry thickness value at each position in the profile range, the amount of slurry defect in the slurry defect position can be obtained, and the slurry coating device 30 can perform slurry coating on the slurry defect position according to the profile information and the thickness information.

[0166] In some embodiments, in step S20, the slurry coating on the slurry defect position of the active material layer 12 according to the slurry defect information at least includes: according to the thickness information and the profile information, performing slurry coating along the profile of the slurry defect position, so that the slurry defect position is filled with slurry and the slurry thickness is equal to the preset slurry thickness of the active material layer 12.

[0167] According to the profile information, the slurry coating is performed along the profile of the slurry defect position, and according to the thickness information, the slurry is coated to fill the slurry defect position with slurry and to make the slurry thickness of the slurry defect position equal to the preset thickness, so that the slurry coating on the slurry defect position is completed.

[0168] In some embodiments, in the step of obtaining the slurry defect information of the active material layer 12, the information value obtained by detecting the active material layer 12 is compared with the preset information value, and the difference between the detected information value and the preset information value is calculated, and the slurry defect information includes the difference.

[0169] By calculating the difference between the obtained information value and the preset information, the slurry defect information of the slurry defect position can be obtained, and the slurry can be coated according to the slurry defect information.

[0170] For example, the first detection device 20 of any of the above embodiments is used to detect the active material layer 12, the first detection device 20 detects the thickness value of the slurry of the slurry defect position and the area value corresponding to the profile of the slurry defect position, compares the thickness value and the area value with the preset thickness value and area value one by one, and calculates the thickness difference and the area difference, the first detection device 20 transmits the thickness difference and the area difference to the slurry coating device 30 as the slurry defect information, and the slurry coating device 30 performs slurry coating on the slurry defect position according to the thickness difference and the area difference, so that the slurry fills the profile of the slurry defect position and the slurry thickness of the slurry defect position is equal to the preset thickness.

[0171] In some embodiments, obtaining the slurry defect information of the active material layer 12 includes: respectively obtaining the slurry defect information of the active material layer 12 on the opposite sides of the electrode tab 10.

[0172] The active material layers 12 on the opposite two side surfaces of the electrode tab 10 (the front side paste layer 121 and the back side paste layer 122) are detected respectively, so that the paste defect information of the front side paste layer 121 and the back side paste layer 122 of the electrode tab 10 is obtained respectively, and the paste defect information of the opposite two side surfaces of the electrode tab 10 is obtained without affecting each other, so that the effect of the paste re-coating can be further improved.

[0173] In some embodiments, the paste re-coating of the paste defect position of the active material layer 12 according to the paste defect information includes: respectively re-coating the paste of the paste defect position of the active material layer 12 on the opposite two sides of the electrode tab 10.

[0174] The active material layers 12 on the opposite two side surfaces of the electrode tab 10 (the front side paste layer 121 and the back side paste layer 122) are detected respectively, so that the paste defect information of the front side paste layer 121 and the back side paste layer 122 of the electrode tab 10 is obtained respectively, and the paste defect information of the opposite two side surfaces of the electrode tab 10 is obtained without affecting each other, so that the effect of the paste re-coating can be further improved.

[0175] In some embodiments, the paste re-coating of the paste defect position of the active material layer 12 according to the paste defect information includes: respectively re-coating the paste of the paste defect position of the active material layer 12 on the opposite two sides of the electrode tab 10.

[0176] In some embodiments, as shown in FIG. 9, after the paste re-coating of the paste defect position of the active material layer 12 according to the paste defect information, that is, after step S20, it further includes: S30, drying the electrode tab 10 after the paste re-coating.

[0177] The electrode tab 10 after the paste re-coating is dried by the drying mechanism 50 to obtain a dried electrode tab 10. In this way, after the active material layer 12 of the electrode tab 10 is re-coated by the paste re-coating device 30, the electrode tab 10 after the paste re-coating is dried by the drying mechanism 50. When the drying operation is performed, the electrode tab 10 can enter the drying mechanism 50 as a whole or in part, and the parameters of the drying mechanism 50 for performing the drying operation can be set according to the amount of the re-coated paste, so that the drying effect of the part of the active material layer 12 after the paste re-coating is completely consistent with the drying effect of the part of the active material layer 12 without the paste re-coating. The drying mechanism 50 can be the drying mechanism 50 in the above embodiments.

[0178] In the specific embodiments, the front paste layer 121 and the back paste layer 122 of the electrode tab 10 are baked respectively, so that the baking operations of the opposite two side surfaces of the electrode tab 10 do not interfere with each other.

[0179] In some embodiments, as shown in FIG. 9, after the electrode tab 10 after the paste supplementing is baked, that is, after step S30, it further includes: S40, detecting the active material layer 12 after baking and determining whether the active material layer 12 after baking still has paste defect sites.

[0180] The electrode tab 10 is detected again after the paste supplementing and baking to determine whether the active material layer 12 of the electrode tab 10 still has paste defects. For the electrode tab 10 still having paste defects, the paste supplementing can be continued. When the second detection does not find the electrode tab 10 having paste defects, the material can be collected for processing.

[0181] In the specific embodiments, the image detection device can also be used to detect the active material layer 12 of the electrode tab 10 after the paste supplementing and baking, such as the first detection device 20 or the second detection device 60 in the above embodiments.

[0182] In some embodiments, in step S40, detecting the active material layer 12 after baking at least includes detecting one or more of the profile, the thickness, the area density and the surface roughness of the active material layer 12.

[0183] By detecting one or more of the profile, the thickness, the area density and the surface roughness of the active material layer 12, the paste defect information of the active material layer 12 is obtained, so that whether the active material layer 12 has paste defects is determined.

[0184] In some embodiments, as shown in FIG. 11, after the active material layer 12 after baking is detected, that is, after step S40, it further includes:

[0185] S50, when the active material layer 12 is detected to have paste defect sites, the paste defect information of the paste defect sites is obtained, the paste supplementing is performed on the paste defect sites of the active material layer 12 according to the paste defect information, and the electrode tab 10 after the paste supplementing is baked.

[0186] In this way, the electrode tab 10 still having paste defects after the first paste supplementing is subjected to the second or multiple times of paste supplementing until the electrode tab 10 does not have paste defects, and the reliability of the paste supplementing is improved.

[0187] In some embodiments, as shown in FIG. 12, after the detection of the active material layer 12 after drying, i.e., after step S40, further comprising:

[0188] S50', when it is detected that there is no slurry defect site on the active material layer 12 of the opposite two surfaces of the electrode tab 10, the electrode tab 10 is collected.

[0189] It should be noted that in the above embodiments, the detection device for obtaining the slurry defect information of the active material layer 12 of the electrode tab 10 can use the first detection device 20 in the above embodiments, or other detection devices, as long as the required information and data can be obtained, which is not limited here. The slurry coating device 30 for coating the slurry defect site can use the slurry coating device 30 in the above embodiments, or other coating devices, as long as the slurry defect site can be accurately coated with slurry, which is not limited here.

[0190] Another embodiment of the present application also provides an electrode tab production system, which comprises the slurry coating device in any of the above embodiments.

[0191] The electrode tab production system of the present embodiment can improve the yield of the electrode tab 10 and thus improve the production efficiency of the electrode tab 10 by integrating the slurry coating device for the active material layer 12 into each process of the production process of the electrode tab 10 and dynamically detecting and coating the slurry of the electrode tab 10 in each different state (such as a large roll-shaped electrode tab, a single film area roll after pre-cutting, a small roll-shaped electrode tab after die cutting and slitting, etc.) obtained in each process.

[0192] Since the electrode tab production system adopts the slurry coating device of the above embodiments, the electrode tab production system at least has all the beneficial effects of the above slurry coating device, which will not be repeated here.

[0193] Another embodiment of the present application also provides an electrode tab production system, which comprises the slurry coating method in any of the above embodiments.

[0194] The electrode tab production system of the present embodiment can improve the yield of the electrode tab 10 and thus improve the production efficiency of the electrode tab 10 by integrating the slurry coating device for the active material layer 12 into each process of the production process of the electrode tab 10 and dynamically detecting and coating the slurry of the electrode tab 10 in each different state (such as a large roll-shaped electrode tab, a single film area roll after pre-cutting, a small roll-shaped electrode tab after die cutting and slitting, etc.) obtained in each process.

[0195] Since the pole piece production system adopts the slurry supplement coating method of the above-mentioned embodiments, the pole piece production system at least has all the beneficial effects of the above-mentioned slurry supplement coating equipment, which will not be repeated here.

[0196] The above description of the embodiments tends to emphasize the differences between the embodiments, and the same or similar parts can be referred to each other, which will not be repeated here for the sake of brevity.

[0197] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present 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 slurry repair coating device, wherein, include: The first detection device is configured to detect the active material layer of the electrode sheet to obtain information on slurry defects in the active material layer. The slurry repair device is communicatively connected to the first detection device and configured to repair the slurry defects in the active material layer based on the slurry defect information.

2. The slurry repair coating equipment according to claim 1, wherein: The first detection device includes at least one of a camera detection device, a laser detection device, an infrared detection device, an X-ray detection device, and an ultrasonic detection device.

3. The slurry repair coating equipment according to claim 1 or 2, wherein: The first detection device is a CCD vision inspection instrument or a 3D profilometer.

4. The slurry repair coating equipment according to any one of claims 1 to 3, wherein: The slurry repair device includes a displacement driving mechanism and a slurry repair mechanism, both of which are communicatively connected to the first detection device. The displacement driving mechanism is driven to move the slurry repair mechanism and repair the slurry defects.

5. The slurry repair coating equipment according to claim 4, wherein: The slurry repair coating equipment also includes a slurry feeding device. The slurry repair coating mechanism includes a slurry conveying pump and a repair coating head installed at the outlet of the slurry conveying pump. The slurry conveying pump is configured to convey slurry from the slurry feeding device to the repair coating head. The displacement driving mechanism is drivenly connected to the repair coating head. The slurry conveying pump is communicatively connected to the first detection device.

6. The slurry repair coating equipment according to claim 5, wherein: The touch-up head includes at least one of an extrusion head and a spray head.

7. The slurry repair coating equipment according to any one of claims 4 to 6, wherein: The slurry coating device is a 3D printer.

8. The slurry repair coating equipment according to any one of claims 1 to 7, wherein: The slurry recoating equipment also includes a feeding mechanism, which is configured to sequentially transport the electrode sheets to be recoated to the first detection device and the slurry recoating device.

9. The slurry repair coating equipment according to claim 8, wherein: The slurry recoating equipment also includes a drying mechanism, which is configured to dry the electrode sheet after it has been recoated by the slurry recoating device.

10. The slurry repair coating equipment according to claim 9, wherein: The slurry recoating equipment also includes a second detection device, which is configured to detect the active material layer of the electrode sheet after it has been dried by the drying mechanism.

11. The slurry repair coating equipment according to claim 10, wherein: The first detection device and the second detection device have the same structure.

12. The slurry repair coating equipment according to claim 10 or 11, wherein: The first detection device, the slurry recoating device, the drying mechanism, and the second detection device are arranged sequentially along the feeding direction of the feeding mechanism.

13. The slurry repair coating equipment according to any one of claims 1 to 12, wherein: The slurry repair coating equipment includes: The two first detection devices are respectively disposed on opposite surfaces of the electrode plates. The sides are respectively configured to detect the active material layers on the opposite two surfaces of the electrode sheet; The two slurry recoating devices are respectively disposed on the sides of opposite surfaces of the electrode sheet and are respectively configured to recoat the active material layer on opposite surfaces of the electrode sheet with slurry.

14. A method for repairing slurry application, wherein, include: The active material layer of the electrode sheet is inspected to obtain information on slurry defects in the active material layer; Based on the slurry defect information, the slurry defects in the active material layer are repaired by applying slurry.

15. The slurry repair coating method according to claim 14, wherein: The detection of the active material layer of the electrode sheet includes at least one of the following: detecting the contour, thickness, areal density, and surface roughness of the active material layer.

16. The slurry repair method according to claim 14 or 15, wherein: The process of obtaining the slurry defect information of the active material layer includes: obtaining at least the contour information and thickness information of the slurry defect area of ​​the active material layer.

17. The slurry repair coating method according to claim 16, wherein: The step of applying slurry to the slurry defect area of ​​the active material layer according to the slurry defect information includes at least: applying slurry along the contour of the slurry defect area according to the thickness information and the contour information, so that the slurry defect area is filled with slurry and the slurry thickness is equal to the preset slurry thickness of the active material layer.

18. The slurry repair coating method according to any one of claims 14 to 17, wherein: In the step of obtaining the slurry defect information of the active material layer, the information value obtained by detecting the active material layer is compared with a preset information value, and the difference between the detected information value and the preset information value is calculated. The slurry defect information includes the difference.

19. The slurry repair coating method according to any one of claims 14 to 18, wherein: The step of obtaining the slurry defect information of the active material layer includes: obtaining the slurry defect information of the active material layer on both sides of the electrode sheet respectively.

20. The slurry repair coating method according to any one of claims 14 to 19, wherein: The step of applying slurry to the slurry defect area of ​​the active material layer according to the slurry defect information includes applying slurry to the slurry defect area of ​​the active material layer on both sides of the electrode sheet respectively.

21. The slurry repair coating method according to any one of claims 14 to 20, wherein: After applying slurry to the defective parts of the active material layer according to the slurry defect information, the method further includes: drying the electrode sheet after slurry application.

22. The slurry repair method according to claim 21, wherein: After drying the electrode sheet after the slurry recoating, the method further includes: inspecting the dried active material layer and determining whether there are still slurry defects in the dried active material layer.

23. The slurry repair method according to claim 22, wherein: The inspection of the dried active material layer includes at least one of the following: inspecting the contour, thickness, areal density, and surface roughness of the active material layer.

24. The slurry repair coating method according to claim 22 or 23, wherein: The process further includes, after testing the dried active material layer: When a slurry defect is detected in the active material layer, slurry defect information is obtained for the slurry defect, and slurry is applied to the slurry defect according to the slurry defect information. The electrode sheet after slurry application is then dried. When it is detected that there are no slurry defects in the active material layer of the electrode sheet, the electrode sheet is collected.

25. An electrode production system, wherein, Includes the slurry repair equipment as described in any one of claims 1 to 13, and / or employs the slurry repair method as described in any one of claims 14 to 24.

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