Pole piece manufacturing method and equipment, pole piece, battery cell, battery and electrical device

Abstract

The present application provides a method and device for manufacturing a pole piece, a pole piece, a battery cell, a battery and an electrical device, belonging to the technical field of battery manufacturing. The method includes: along the moving direction of the substrate, forming a plurality of film coatings spaced from each other in sequence on at least one surface of the substrate, and during the movement of the substrate, detecting the moving trajectory of the substrate, and based on the detected deviation of the moving trajectory of the substrate from a preset trajectory, correcting the moving direction of the substrate so that the substrate moves along the preset trajectory; forming an active material layer on at least a part of the surface of the substrate where the film coatings are formed, and the active material layer covers the surface of the film coatings; removing the plurality of film coatings to form a plurality of blank areas on the surface of the substrate; cutting the substrate so that the substrate forms pole tabs of the pole piece in the plurality of blank areas respectively, and the remaining part of the substrate with the active material layer forms the main body part of the pole piece, and the pole tabs are located on at least one side of the main body part. The pole piece manufacturing method of the present application can improve the yield of the manufactured pole piece.

Description

Technical Field

[0001] This application relates to the technical field of battery manufacturing, and in particular, to a method and device for manufacturing an electrode sheet, an electrode sheet, a battery cell, a battery, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] A battery includes an electrode sheet. The part of the electrode sheet surface where an active material layer is formed constitutes the main body part, and the part without the active material layer constitutes the tab. The active material layer on the main body part can react with the electrolyte in the battery, and the tab is connected to the electrode terminal of the battery to form a current loop.

[0004] However, currently, the thickness of the active material layer at the edge of the tab of the electrode sheet is thinner than that of the active material layer of the main body part, which affects the performance of the battery and results in a low yield of the manufactured electrode sheet. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems existing in the background art. For this reason, an object of this application is to provide a method and device for manufacturing an electrode sheet, an electrode sheet, a battery cell, a battery, and an electrical device to solve the problem of low yield of the manufactured electrode sheet.

[0006] An embodiment of the first aspect of this application provides a method for manufacturing an electrode sheet, including: during the movement of a substrate, along the movement direction of the substrate, a plurality of film coatings spaced from each other are sequentially formed on at least one surface of the substrate, and during the movement of the substrate, the movement trajectory of the substrate is detected, and based on the detected movement trajectory of the substrate deviating from a preset trajectory, the movement direction of the substrate is corrected so that the substrate moves along the preset trajectory; an active material layer is formed on at least a part of the surface of the substrate where the film coatings are formed, and the active material layer covers the surface of the film coatings; the plurality of film coatings are removed to form a plurality of blank areas on the substrate surface; the substrate is cut so that the substrate forms tabs of the electrode sheet in the plurality of blank areas respectively, and the remaining part of the substrate with the active material layer forms the main body part of the electrode sheet, and the tabs are located on at least one side of the main body part.

[0007] In the technical solution of the embodiment of the present application, forming a plurality of coating films in sequence on a moving substrate can improve efficiency. The formed active material layer covers the surface of the coating film, and subsequently the coating film is removed to form a blank area without an active material layer, and the blank area forms a tab. That is to say, the position where the coating film is located is the tab position. In this way, in the step of removing the coating film, the thinner area in the active material layer formed at the tab position can be synchronously removed, so that the thickness of the active material layer at the edge of the formed tab is consistent with the thickness of the active material layer of the main body, improving the flatness of the main body part of the electrode sheet. Among them, by controlling the substrate to move along a preset trajectory, it is beneficial to control the position of the formed active material layer to meet the expectation, so that its positional relationship with the plurality of coating films meets the expectation, which is beneficial to improving the flatness of the main body part. At the same time, since the adjacent coating films in the embodiment of the present application are spaced apart from each other, even if the substrate is corrected during the formation of the plurality of coating films and the substrate is offset, the formed coating film will not pull the substrate, so as not to cause problems such as substrate breakage or wrinkling, thereby being able to ensure the integrity of the electrode sheet morphology to a certain extent, making the electrode sheet maintain good performance, and overall improving the yield of the electrode sheet.

[0008] In some embodiments, the plurality of coating films are located in the peripheral area of the active material layer. Due to process reasons, the thickness of the peripheral area of the active material layer is more easily thinned compared to the thickness of the central area. The coating film is located in the peripheral area of the active material layer, so that the thinner part of the active material layer can just cover the surface of the coating film. Subsequently, when the coating film is removed, the thinner part of the active material layer can be smoothly removed, making the thickness of the remaining part of the active material layer more consistent, and further improving the flatness of the main body part.

[0009] In some embodiments, forming an active material layer on at least a part of the surface of the substrate where the coating film is formed includes: forming an active material layer on at least a part of the surface of the moving substrate where the coating film is formed. Since the substrate is corrected during the movement of the substrate so that the substrate can move along a preset trajectory, in this way, the position of the active material layer formed during the movement of the substrate can also meet the expectation, so that the peripheral area in the active material layer can cover the coating film, and subsequently when the coating film is removed, the thinner part of the active material layer can be smoothly removed.

[0010] In some embodiments, forming an active material layer on at least a part of the surface of the substrate where the coating film is formed includes: coating an active material layer slurry on the surface of the substrate where the coating film is formed; drying the active material layer slurry to form an initial active material layer; extruding the initial active material layer to form an active material layer. During the process of moving the substrate, performing the above steps in sequence can save process time and improve the preparation efficiency of the electrode sheet.

[0011] In some embodiments, the coated film includes adhesive paper. Removing a plurality of coated films includes: during the drying process of the substrate and the active material layer slurry, heating the adhesive paper to make it separate from the surface of the substrate. In this way, there is no need to adopt additional process steps to remove the adhesive paper, saving procedures and further improving the preparation efficiency of the electrode sheet. In addition, since the coated film has separated from the substrate during the drying process, during the subsequent step of extruding the substrate, it is possible to avoid, to a certain extent, the problem that the extrusion force on the blank area is too large due to the presence of the coated film, resulting in deformation of the tab formed by the blank area in the subsequent process, so that the electrode sheet has a good morphology to maintain its excellent performance.

[0012] In some embodiments, the substrate includes opposite first and second surfaces. Forming a plurality of coated films on the first surface includes: forming a first coated film on the first surface through a coated film forming device; obtaining the position information of the first coated film; controlling the coated film forming device based on the position information of the first coated film, with the position of the first coated film as the starting reference position, and sequentially forming the remaining coated films at intervals of a preset distance. That is to say, among the plurality of coated films, the distance between adjacent coated films is a fixed distance, which is beneficial to subsequent cutting of the substrate to form electrode sheets with consistent specifications.

[0013] In some embodiments, forming a plurality of coated films on the first surface further includes: obtaining the first difference between the interval distance between the currently formed coated film and the previously formed coated film and the preset distance; in response to the first difference being greater than the preset threshold, controlling the coated film forming device to correct the forming position of the next coated film to be formed, so that the interval distance between the next coated film to be formed and the currently formed coated film is less than or equal to the preset threshold. In this way, it is beneficial to keep the interval distance between adjacent coated films consistent, so that the distance between adjacent coated films is a fixed distance. And in this way, only the first coated film needs to be positioned, and then only the remaining coated films need to be sequentially formed at intervals of a fixed preset distance to form a plurality of coated films with a fixed distance, simplifying the steps of forming the coated film and improving production efficiency.

[0014] In some embodiments, the substrate includes opposite first and second surfaces. Removing a plurality of coated films to form a plurality of blank areas on the substrate surface includes: forming a plurality of coated films on both the first surface and the second surface of the substrate, so that after removing the plurality of coated films, a plurality of blank areas are formed on both the first surface and the second surface. Among them, in the projection plane parallel to the substrate surface, the orthographic projections of the plurality of blank areas on the first surface coincide with the orthographic projections of the plurality of blank areas on the second surface. In this way, the first surface and the second surface are symmetric structures. During the subsequent cutting process of the substrate, only by cutting along the cutting area of the first surface or the second surface, the structures of the tab and the main body part on the first surface and the second surface can be made consistent, which is beneficial to improving the performance of the electrode sheet.

[0015] In some embodiments, the plurality of blank areas on the first surface are formed prior to the plurality of blank areas on the second surface. Forming the plurality of blank areas on the second surface includes: obtaining the position information of each blank area on the first surface, and forming a plurality of coating films on the second surface that correspond one-to-one in position to the plurality of blank areas on the first surface based on the obtained position information of the blank areas; forming an active material layer on the second surface; and removing the coating films on the second surface to form a plurality of blank areas on the second surface. Positioning the formation positions of each coating film on the second surface respectively based on the actual position information of the plurality of blank areas formed on the first surface can greatly increase the probability that the blank areas formed on the second surface and the blank areas formed on the first surface are in a symmetrical structure, and improve the consistency of the structures of the first surface and the second surface.

[0016] In some embodiments, cutting the substrate includes: determining a cutting line of the substrate, where the cutting line is used to form a cutting area of the substrate, and the cutting area at least includes the substrate between adjacent blank areas; and cutting the substrate along the cutting line. In this way, not only can adjacent blank areas be disconnected to form tabs respectively, but also the thinner areas of the active material layer on the substrate between adjacent blank areas can be removed, so that the overall thickness of the remaining active material layer is relatively consistent.

[0017] An embodiment of the second aspect of the present application provides a pole piece manufacturing device, which includes: a conveying device for moving the substrate; a coating film forming device for sequentially forming a plurality of coating films spaced apart from each other on at least one surface of the substrate along the moving direction of the substrate during the movement of the substrate; a deviation correction device for detecting the moving trajectory of the substrate during the movement of the substrate and correcting the moving direction of the substrate based on the detected deviation of the moving trajectory of the substrate from a preset trajectory so that the substrate moves along the preset trajectory; an active material layer forming device for forming an active material layer on at least a part of the surface of the substrate where the coating film is formed, and the active material layer covers the surface of the coating film; and a cutting device for cutting the substrate after removing the coating film, so that the substrate forms tabs of the pole piece in the areas covered by the coating film, and the remaining part of the substrate with the active material layer forms the main body of the pole piece, and the tabs are located on at least one side of the main body. That is to say, the position where the coating film is located is the tab position. During the process of removing the coating film, the thinner areas in the active material layer formed at the tab position can be synchronously removed, so that the thickness of the active material layer at the edge of the formed tab is consistent with the thickness of the active material layer of the main body, and the flatness of the main body of the pole piece is improved.

[0018] In some embodiments, a plurality of coating films are located in the peripheral region of the active material layer. In this way, the peripheral region with a smaller thickness in the active material layer can cover the surface of the coating film. Subsequently, when the coating film is removed, the part with a smaller thickness in the active material layer can be smoothly removed, so that the thickness of the remaining part in the active material layer is relatively consistent, further improving the flatness of the main body part.

[0019] In some embodiments, the active material layer forming device includes: a coating mechanism configured to coat the active material layer slurry on the surface of a moving substrate where the coating film is formed; a drying mechanism for drying the active material layer slurry on the surface of the moving substrate to form an initial active material layer; and an extrusion mechanism for extruding the initial active material layer to form the active material layer. The coating mechanism, the drying mechanism, and the extrusion mechanism process the substrate in sequence during the movement of the substrate, which can save process time and improve the preparation efficiency of the electrode sheet.

[0020] In some embodiments, the substrate includes: opposite first and second surfaces. The coating film forming device is used to form a plurality of coating films on the first surface. The electrode sheet manufacturing equipment further includes: a positioning mechanism for obtaining the position information of the first coating film formed by the coating film forming device on the surface of the substrate; and the coating film forming device is used to sequentially form the remaining coating films at a preset distance interval based on the position information of the first coating film with the position of the first coating film as the starting reference position. That is to say, among the plurality of coating films, the distance between adjacent coating films is a fixed distance, which is beneficial to subsequent cutting of the substrate to form electrode sheets with consistent specifications.

[0021] In some embodiments, the positioning mechanism is further used to obtain the position information of each blank area on the first surface after a plurality of coating films on the first surface are removed to form a plurality of blank areas, and the coating film forming device is further used to form a plurality of coating films on the second surface that correspond one-to-one with the positions of the plurality of blank areas on the first surface based on the position information of the blank areas. In this way, the probability that the blank areas formed on the second surface are structurally symmetric with the blank areas formed on the first surface can be greatly improved, and the structural consistency between the first surface and the second surface can be improved.

[0022] In some embodiments, the electrode sheet manufacturing equipment further includes: a measuring mechanism for obtaining the first difference between the interval distance between the currently formed coating film and the previously formed coating film and the preset distance; and the coating film forming device is used to correct the forming position of the next coating film to be formed in response to the first difference being greater than the preset threshold, so that the interval distance between the next coating film to be formed and the currently formed coating film is less than or equal to the preset threshold. In this way, it is beneficial to keep the interval distance between adjacent coating films consistent, so that the distance between adjacent coating films is a fixed distance.

[0023] In some embodiments, the coating film is adhesive paper, and the coating film forming device includes an adhesive pasting mechanism. In this way, the adhesive pasting mechanism only needs to paste the adhesive paper onto the substrate, simplifying the steps of forming the coating film. In addition, by using adhesive paper, during the drying process of the substrate by the drying mechanism, the adhesive paper can be separated from the substrate by heating, eliminating the need for additional processes to remove the adhesive paper, saving procedures and improving the preparation efficiency of the electrode sheet. Moreover, in the subsequent step of extruding the substrate by the extrusion mechanism, it can to a certain extent avoid the problem that the excessive extrusion force on the blank area caused by the presence of the coating film leads to deformation of the tab formed by the blank area in the subsequent process, enabling the electrode sheet to have a good morphology and maintaining its excellent performance.

[0024] Embodiments of the third aspect of the present application provide an electrode sheet, which is manufactured by using the electrode sheet manufacturing method in the above embodiments or by using the electrode sheet manufacturing equipment in the above embodiments. In this way, the flatness of the main body part of the electrode sheet can be improved, which is beneficial to enhancing the reliability of the electrode sheet during subsequent use.

[0025] Embodiments of the fourth aspect of the present application provide a battery cell, including the electrode sheet in the above embodiments. Since the flatness of the main body part of the electrode sheet is improved, the flatness of the battery cell is relatively high. When the battery cell is pressed, the force on the battery cell is relatively evenly distributed, greatly reducing the phenomena of crushing and fracturing of the battery cell, thereby improving the use stability of the battery cell.

[0026] The fifth aspect of the present application provides a battery, which includes the battery cell in the above embodiments.

[0027] Embodiments of the sixth aspect of the present application provide an electrical device, which includes the battery in the above embodiments, and the battery is used to provide electrical energy.

[0028] The above description is only an overview of the technical solutions of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically described. Description of the Drawings

[0029] In the drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed according to the present application and should not be regarded as limiting the scope of the present application.

[0030] Figure 1 It is a corresponding schematic diagram of the step of forming the active material layer in an electrode sheet manufacturing method;

[0031] Figure 2Schematic diagram corresponding to the steps of forming tabs and a main body in a method for manufacturing a pole piece;

[0032] Figure 3 Schematic diagram of the structure of a vehicle provided by some embodiments of the present application;

[0033] Figure 4 Schematic diagram of the structure of a solid-state battery provided by some embodiments of the present application;

[0034] Figure 5 One of the flowcharts of a method for manufacturing a pole piece provided by some embodiments of the present application;

[0035] Figure 6 One of the three-dimensional structure schematic diagrams corresponding to the step of forming an active material layer in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0036] Figure 7 Two of the three-dimensional structure schematic diagrams corresponding to the step of forming an active material layer in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0037] Figure 8 One of the structure schematic diagrams corresponding to the step of cutting a substrate in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0038] Figure 9 Two of the structure schematic diagrams corresponding to the step of cutting a substrate in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0039] Figure 10 Schematic diagram of the structure of a pole piece formed in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0040] Figure 11 One of the structure schematic diagrams corresponding to the step of forming a plurality of coating films spaced apart from each other on at least one surface of a substrate in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0041] Figure 12 Two of the structure schematic diagrams corresponding to the step of forming a plurality of coating films spaced apart from each other on at least one surface of a substrate in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0042] Figure 13 Three of the structure schematic diagrams corresponding to the step of forming a plurality of coating films spaced apart from each other on at least one surface of a substrate in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0043] Figure 14 Four of the structure schematic diagrams corresponding to the step of forming a plurality of coating films spaced apart from each other on at least one surface of a substrate in a method for manufacturing a pole piece provided by some embodiments of the present application;

[0044] Figure 15The second flowchart of the method for manufacturing an electrode sheet according to some embodiments of the present application;

[0045] Figure 16 The third flowchart of the method for manufacturing an electrode sheet according to some embodiments of the present application;

[0046] Figure 17 The first front view structural schematic diagram corresponding to the step of forming an active material layer in the method for manufacturing an electrode sheet according to some embodiments of the present application;

[0047] Figure 18 The fourth flowchart of the method for manufacturing an electrode sheet according to some embodiments of the present application;

[0048] Figure 19 The fifth flowchart of the method for manufacturing an electrode sheet according to some embodiments of the present application;

[0049] Figure 20 The second front view structural schematic diagram corresponding to the step of forming an active material layer in the method for manufacturing an electrode sheet according to some embodiments of the present application;

[0050] Figure 21 The sixth flowchart of the method for manufacturing an electrode sheet according to some embodiments of the present application.

[0051] Description of reference numerals:

[0052] Vehicle 1000;

[0053] Battery 100, film coating 101, blank area 102;

[0054] Controller 200;

[0055] Motor 300;

[0056] Substrate 10, main body portion 11, tab 12, active material layer 20, thinned area 20a, empty foil area 21;

[0057] Guide roller 30;

[0058] Coating roller 40;

[0059] Coating head 50;

[0060] First CCD camera 61, second CCD camera 62, third CCD camera 63;

[0061] First cutting line 71, second cutting line 72;

[0062] First surface 1, second surface 2;

[0063] Length direction X, width direction Y. Detailed implementation manners

[0064] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0066] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0067] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0068] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0069] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0070] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0071] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0072] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.

[0073] The battery includes a pole piece. The part of the pole piece surface where the active material layer is formed constitutes the main body part, and the part without the active material layer constitutes the pole ear. The active material layer on the main body part can react with the electrolyte in the battery, and the pole ear is connected to the electrode terminal of the battery to form a current loop.

[0074] Figure 1 It is a corresponding schematic diagram of the step of forming the active material layer in a method for manufacturing a pole piece. Figure 2 It is a corresponding schematic diagram of the steps of forming the pole ear and the main body part in a method for manufacturing a pole piece.

[0075] In some cases, the method for forming a pole piece includes the following steps:

[0076] As Figure 1 shown, first, an active material layer 20 is coated and formed on a part of the base material 10, and a blank foil area 21 is formed in the area on one side of the active material layer 20.

[0077] As Figure 2As shown in the figure, the empty foil area 21 is cut to form the tabs 12 arranged at intervals, and the substrate with the active material layer 20 forms the main body 11.

[0078] Due to process reasons, the edge of the active material layer 20 formed by coating is thinner than the center position, thus forming a thinning area 20a. That is to say, there is a thinning area 20a in the active material layer 20 at the edge close to the empty foil area 21. After cutting the empty foil area 21 to form the electrode sheet, the thinning area 20a is located in the area where the main body 11 is connected to the tab 12, resulting in a lower flatness of the main body 11, and further resulting in a lower yield of the manufactured electrode sheet. When the electrode sheet is wound or laminated to form a battery assembly, the height difference between the tab 12 side and the other positions of the battery assembly is large, affecting the stability of the battery.

[0079] Especially for solid-state batteries, if the overall flatness of the solid-state battery is low, the solid-state battery is prone to uneven stress under high voltage, resulting in the solid-state battery being easily crushed, cracked, and finally scrapped.

[0080] Based on the above considerations, the embodiment of the present application provides a method for manufacturing an electrode sheet. A plurality of films are sequentially formed on a moving substrate, and the formed active material layer covers the surface of the film. Subsequently, the film is removed to form a blank area without an active material layer, and the blank area forms the tab. The position where the film is located is the tab position. In this way, in the step of removing the film, the thinner area in the active material layer formed at the tab position can be synchronously removed, so that the thickness of the active material layer at the edge of the formed tab is the same as that of the active material layer of the main body, improving the flatness of the main body of the electrode sheet.

[0081] Moreover, by controlling the substrate to move along a preset trajectory, it is beneficial to control the position of the formed active material layer to meet the expectation, so that the positional relationship between it and the plurality of films meets the expectation, which is beneficial to improving the flatness of the main body. At the same time, since the adjacent films in the embodiment of the present application are spaced from each other, even if the substrate is corrected during the process of forming the plurality of films and the substrate is offset, the formed films will not pull the substrate, thus not causing problems such as substrate breakage or wrinkling, thereby being able to ensure the integrity of the morphology of the electrode sheet to a certain extent, enabling the electrode sheet to maintain good performance, and overall improving the yield of the electrode sheet.

[0082] The method for manufacturing an electrode sheet disclosed in the embodiment of the present application can be used for manufacturing the electrode sheet in a battery. The battery can be but is not limited to power-consuming devices such as vehicles, ships, or aircraft. A power supply system composed of a battery disclosed in the present application can be used to form the power-consuming device, which is beneficial to improving the use stability of the battery.

[0083] The embodiments of the present application provide an electrical device using a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0084] For the convenience of description in the following embodiments, a vehicle 1000, which is an electrical device according to an embodiment of the present application, is taken as an example for description.

[0085] Please refer to Figure 3 , Figure 3 , which is a schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0086] In some embodiments of the present application, the battery 100 may not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0087] The battery may include, but is not limited to, a solid-state battery. The structure of the battery will be described below taking the solid-state battery as an example.

[0088] Please refer to Figure 4 , Figure 4 , which is a schematic structural diagram of a solid-state battery provided by some embodiments of the present application.

[0089] The solid-state battery includes a positive electrode plate, a negative electrode plate and a solid electrolyte. The solid electrolyte is located between the positive electrode plate and the negative electrode plate and is used to form an ion channel between the positive electrode plate and the negative electrode plate to ensure the transfer and reaction of positive and negative ions. The material of the solid electrolyte may include oxides, phosphates, silicates, nitrides or sulfides, etc. The positive electrode plate, the negative electrode plate and the solid electrolyte located between the positive electrode plate and the negative electrode plate are wound or stacked to form a solid-state battery. Figure 1The structure of a solid-state battery is formed by laminating a positive electrode sheet, a negative electrode sheet, and a solid electrolyte. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body portion 11 of the solid-state battery, and the portions of the positive electrode sheet and the negative electrode sheet without active materials constitute the tabs 12. The tabs 12 can be located together at one end of the main body portion 11 or respectively at both ends of the main body portion 11. The shape of the solid-state battery can be rectangular, cylindrical, or other shapes.

[0090] Reference Figures 5 to 10 , Figure 5 is one of the flowcharts of the method for manufacturing an electrode sheet according to some embodiments of the present application; Figure 6 is one of the schematic three-dimensional structures corresponding to the step of forming an active material layer in the method for manufacturing an electrode sheet according to some embodiments of the present application; Figure 7 is the second schematic three-dimensional structure corresponding to the step of forming an active material layer in the method for manufacturing an electrode sheet according to some embodiments of the present application; Figure 8 is one of the schematic structures corresponding to the step of cutting a substrate in the method for manufacturing an electrode sheet according to some embodiments of the present application; Figure 9 is the second schematic structure corresponding to the step of cutting a substrate in the method for manufacturing an electrode sheet according to some embodiments of the present application; Figure 10 is the schematic structure of the electrode sheet formed in the method for manufacturing an electrode sheet according to some embodiments of the present application.

[0091] Among them, Figure 6 and Figure 7 the active material layer in is shown in a form with a certain transparency to facilitate the description of the positional relationship between the active material layer and the coating film. In the actual manufacturing method, the active material layer can be made of a transparent material or an opaque material.

[0092] Some embodiments of the present application provide a method for manufacturing an electrode sheet, including:

[0093] Step 110, as Figure 6 and Figure 7 shown, during the movement of the substrate 10, along the movement direction of the substrate 10, a plurality of coating films 101 spaced apart from each other are sequentially formed on at least one surface of the substrate 10, and during the movement of the substrate 10, the movement trajectory of the substrate 10 is detected, and based on the detected deviation of the movement trajectory of the substrate 10 from the preset trajectory, the movement direction of the substrate 10 is corrected so that the substrate 10 moves along the preset trajectory;

[0094] Step 120, as Figure 6 and Figure 7 shown, an active material layer 20 is formed on at least a part of the surface of the substrate 10 on which the coating film 101 is formed, and the active material layer 20 covers the surface of the coating film 101;

[0095] Step 130, asFigure 8 As shown, a plurality of coating films 101 are removed to form a plurality of blank areas 102 on the surface of the substrate 10;

[0096] Step 140, as Figure 9 and Figure 10 As shown, the substrate 10 is cut so that the substrate 10 forms the tabs 12 of the electrode plate at the plurality of blank areas 102 respectively, and the remaining part of the substrate 10 with the active material layer 20 forms the main body 11 of the electrode plate. The tabs 12 are located on at least one side of the main body 11.

[0097] In step 110, the position of the substrate 10 covered by the coating film 101 is the position of the tab 12. In some embodiments, the size of the coating film 101 may be the same as the size of the tab 12 formed subsequently. In other embodiments, the size of the coating film 101 may also be larger than the size of the tab 12 formed subsequently.

[0098] The material of the coating film 101 includes but is not limited to materials such as tapes, plastic films, metal films, papers, resin films, etc. that can cover the substrate 10.

[0099] The material of the substrate 10 may be a conductive material, and the conductive material includes but is not limited to metals or conductive semiconductor materials, etc. Exemplarily, the conductive material may include but is not limited to at least one of copper, aluminum, nickel, stainless steel, composite materials, conductive polymers, laminated composite thin film materials, conductive resins, carbon-coated metal foils, or other conductive materials.

[0100] The plurality of coating films 101 may be formed on one surface of the substrate 10, or may be formed on two opposite surfaces of the substrate 10.

[0101] The preset trajectory refers to the pre-set moving path of the substrate 10.

[0102] In some embodiments, in step 110, the substrate 10 may be moved by a conveying device. The conveying device may include an unwinding mechanism (not shown), a winding mechanism (not shown), and a guiding roller 30. One end of the substrate 10 may be wound around the unwinding mechanism, and the other end of the substrate 10 passes through the guiding roller 30 and is wound around the winding mechanism. The winding mechanism pulls the substrate 10 to realize the movement of the substrate 10.

[0103] In some embodiments, a deviation rectifying device may be used to detect the moving trajectory of the substrate 10 and rectify the deviation of the substrate 10. The deviation rectifying device may be any structure well-known to those skilled in the art that can rectify the moving direction of the moving substrate 10.

[0104] Exemplarily, the deviation correction device may include two sensors, a controller, and a deviation correction roller. The sensors may be located on opposite sides of the substrate 10 and are used to detect the distance between the substrate 10 and themselves. The deviation correction roller is used to guide the moving direction of the substrate 10. If the substrate 10 moves along a preset trajectory, the distances detected by the two sensors are the same. If there is a deviation in the distances detected by the two sensors, it indicates that the substrate 10 has shifted. The sensors send the detected distances to the controller. After receiving the data, the controller calculates the moving angle of the deviation correction roller according to a preset algorithm and program to correct the moving direction of the substrate 10.

[0105] If the substrate 10 is moved along the length direction of the substrate 10, the formed multiple coating films 101 are arranged at intervals along the length direction of the substrate 10. If the substrate 10 is moved along the width direction of the substrate 10, the formed multiple coating films 101 are arranged at intervals along the width direction of the substrate 10.

[0106] In some embodiments, if multiple coating films 101 are formed on the substrate 10 simultaneously, multiple rows of coating films 101 arranged at intervals can be formed. Each row of coating films 101 is arranged at intervals along the length direction or the width direction.

[0107] In some embodiments, a coating film forming working position is provided on the moving path of the substrate 10. The coating film forming working position is used to process the substrate 10 to form the coating film 101. The substrate 10 will pass through this coating film forming working position in sequence to form multiple coating films 101 in sequence. In this way, the efficiency of the step of forming the coating film 101 can be improved.

[0108] In some embodiments, the coating film forming working position may be provided with a coating film forming device. Whenever the substrate 10 passes by, the coating film forming device can form the coating film 101 on the substrate 10 passing by in sequence according to a preset rhythm.

[0109] It can be understood that if the substrate 10 shifts during the movement of the substrate 10, it may cause the positions of the formed multiple coating films 101 on the substrate 10 to not meet the expectations. Thus, there may be a deviation in the positional relationship between the subsequently formed active material layer 20 and the multiple coating films 101. For example, if the substrate 10 shifts and causes the formed multiple coating films 101 not to be arranged at intervals in the same direction, when the active material layer 20 is subsequently formed, it may cause some of the coating films 101 to be located in the peripheral area of the active material layer 20, and the remaining coating films 101 to be located in the central area of the active material layer 20.

[0110] Based on the above considerations, the substrate 10 is configured to be able to move along a preset trajectory so that the positions of the multiple coatings 101 formed along the moving direction of the substrate 10 are as expected. This not only improves the efficiency of forming the coating, but also helps to control the position of the tab 12 to be as expected, as well as control the positional relationship between the subsequently formed active material layer 20 and the multiple coatings 101 to be as expected.

[0111] In addition, since the multiple coatings 101 are formed at intervals along the moving direction of the substrate 10 in the embodiment of the present application, that is, there is no continuity between adjacent coatings 101, even if the substrate 10 is corrected during the process of forming the multiple coatings 101 and the substrate 10 is offset, it will not cause the substrate 10 to break or wrinkle, thereby ensuring the integrity of the electrode morphology to a certain extent, so that the electrode maintains good performance.

[0112] This is because, when the substrate 10 is deflected, the coating 101 is not deflected synchronously, resulting in the substrate 10 and the coating 101 not being deflected synchronously. If the coating 101 is a continuous strip, then after the substrate 10 is deflected, the relative position of the subsequently formed coating 101 and the substrate 10 will be offset. This will cause the coating 101 that has been formed on the substrate 10 to pull on the substrate 10, making the substrate 10 prone to wrinkling or even breaking. In the embodiment of the present application, multiple coatings 101 are spaced apart from each other. Even if the position of the substrate 10 is deflected, the previously formed coating 101 will form a tension barrier through the gaps between the coatings, thereby not pulling on the substrate 10, which can greatly reduce the risk of wrinkling or even breaking the substrate 10.

[0113] In step 120, the active material layer 20 covers not only the surface of the coating 101 but also at least a portion of the surface of the substrate 10 on which the coating 101 is formed, excluding the coating 101. Thus, after the coating 101 is subsequently removed, the portion of the substrate 10 containing the active material layer 20 constitutes the main body 11 of the electrode.

[0114] In some embodiments, the active material layer 20 may include a positive electrode active material layer and a negative electrode active material layer. The main body 11 formed with the positive electrode active material layer constitutes a positive electrode sheet, and the main body 11 formed with the negative electrode active material layer constitutes a negative electrode sheet. The material of the positive electrode active material layer may include, but is not limited to, at least one of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode active material may include, but is not limited to, at least one of carbon, silicon, metallic lithium, lithium titanate, or a composite negative electrode material.

[0115] In step 130, since the position of the substrate 10 where the film 101 is located is not formed with the active material layer 20 because it is covered by the film 101, after removing a plurality of films 101, a blank area 102 is formed at the original position of the film 101, and the blank area 102 is the position of the tab 12. In the embodiment of the present application, the active material layer 20 that should originally be entirely formed in the main body 11 is formed on the film 101 corresponding to the position of the tab 12, so that the thinning area originally formed at the connection position of the main body 11 and the tab 12 is transferred to the film 101. Thus, after removing the film 101, the thinning area can be removed together, so that the thickness of the remaining active material layer 20 is consistent.

[0116] In step 140, in the formed electrode sheet, the tab 12 can be located on only one side of the main body 11, or can be located on opposite sides of the main body 11. As Figure 9 shown, a plurality of spaced-apart tabs 12 can be connected to one side of the main body 11, or as Figure 10 shown, there can also be only one tab 12 on one side of the main body 11.

[0117] In the case where a plurality of tabs 12 are connected to one side of the main body 11, the electrode sheet can be wound to form an electrode assembly. In the case where there is only one tab 12 on one side of the main body 11, a plurality of electrode sheets can be stacked to form an electrode assembly.

[0118] In the above technical solution, in the step of removing the film 101, the thinner area in the active material layer 20 formed at the position of the tab 12 is synchronously removed, so that the thickness of the active material layer 20 at the edge of the formed tab 12 is the same as the thickness of the active material layer 20 of the main body 11, improving the flatness of the main body 11 of the electrode sheet. Among them, by controlling the movement of the substrate 10 along a preset trajectory, it is beneficial to control the position of the formed active material layer to meet the expectation, so that the positional relationship between it and a plurality of films 101 meets the expectation, which is beneficial to improving the flatness of the main body 11. At the same time, since the adjacent films 101 are spaced apart from each other in the embodiment of the present application, even if the substrate is corrected during the formation of a plurality of films and the substrate 10 is offset, the formed films will not pull on the substrate, so that the substrate 10 will not have problems such as broken belt or wrinkling. Thus, to a certain extent, the morphology integrity of the electrode sheet can be guaranteed, so that the electrode sheet maintains good performance, and the yield of the electrode sheet is improved as a whole.

[0119] According to some embodiments of the present application, a plurality of films 101 are located in the peripheral area of the active material layer 20.

[0120] The active material layer 20 can include a central area and a peripheral area surrounding the central area. In other words, the peripheral area is the area of the active material layer 20 close to the edge.

[0121] Due to process reasons, the thickness of the peripheral region of the active material layer 20 is more likely to be thinned compared to the thickness of the central region. That is, the thinned region is usually formed in the peripheral region of the active material layer 20. A plurality of coating films 101 are located in the peripheral region of the active material layer 20. That is, the peripheral region of the active material layer 20 covers the coating films 101. Subsequently, when the coating films 101 are removed, the thinned region in the active material layer 20 can be removed together.

[0122] It can be understood that the position of the coating films 101 on the substrate 10 can be adjusted according to different process requirements. Exemplarily, as Figure 11 shown, the coating films 101 can be formed in the region near the edge of the substrate 10, such as the edge in the length direction X of the substrate 10 or the edge in the width direction Y of the substrate 10. As Figure 12 shown, the coating films 101 can also be formed in the region far from the edge of the substrate 10, that is, formed in the region near the center of the substrate 10, as long as the peripheral region of the subsequently formed active material layer 20 covers the coating films 101.

[0123] The plurality of coating films 101 can be arranged at intervals along the length direction X of the substrate 10, or can be arranged at intervals along the width direction Y of the substrate 10.

[0124] As Figure 13 shown, in some embodiments, the plurality of coating films 101 can be arranged in adjacent multiple rows. Among them, each row of coating films 101 can be arranged at intervals along the length direction X of the substrate 10, and adjacent rows can be arranged at intervals along the width direction Y of the substrate 10. Or, as Figure 14 shown, each row of coating films 101 can be arranged at intervals along the width direction Y of the substrate 10, and adjacent rows can be arranged at intervals along the length direction X of the substrate 10.

[0125] In other embodiments, only one row of coating films 101 can be formed, and each row of coating films 101 is arranged at intervals along the length direction X of the substrate 10, or along the width direction Y of the substrate 10.

[0126] In other embodiments, the plurality of coating films 101 can also be arranged at intervals in a direction having an angle with the length direction X or the width direction Y of the substrate 10, rather than being limited to being arranged at intervals along the length direction X or the width direction Y of the substrate 10.

[0127] In the above technical solution, the coating films 101 are located in the peripheral region of the active material layer 20, so that the portion with a smaller thickness in the active material layer 20 can just cover the surface of the coating films 101. Subsequently, when the coating films 101 are removed, the portion with a smaller thickness in the active material layer 20 can be smoothly removed, so that the thickness of the remaining portion in the active material layer 20 is relatively uniform, further improving the flatness of the main body portion 11.

[0128] According to some embodiments of the present application, step 120 includes:

[0129] Forming an active material layer 20 on at least a part of the surface of the moving substrate 10 where the coating film 101 is formed.

[0130] That is to say, during the movement of the substrate 10, the coating film 101 and the active material layer 20 are sequentially formed on the substrate 10.

[0131] Reference Figure 6 And Figure 7 , in some embodiments, the conveying device further includes a coating roller 40, and the substrate 10 passes between the guiding roller 30 and the coating roller 40, so that the substrate 10 is unfolded from the unwinding mechanism and sequentially passes through the guiding roller 30 and the coating roller 40, and finally is wound onto the winding mechanism. When the substrate 10 moves between the unwinding mechanism and the guiding roller 30, the coating film 101 is formed on the substrate 10. The substrate 10 with the coating film 101 continues to move and passes between the guiding roller 30 and the coating roller 40, and the substrate 10 wound around the surface of the coating roller 40 is coated to form the active material layer 20. In this way, the formed active material layer 20 can cover the surface of the coating film 101.

[0132] In the above technical solution, since the substrate 10 is corrected during the movement of the substrate 10 so that the substrate 10 can move along a preset trajectory, thus, the position of the active material layer 20 formed during the movement of the substrate 10 can also meet the expectation, so that the peripheral area in the active material layer 20 can cover the coating film 101, so that when the coating film 101 is removed later, the part with a smaller thickness in the active material layer 20 can be smoothly removed.

[0133] Reference Figure 15 , Figure 15 This is the second flowchart of the method for manufacturing a pole piece according to some embodiments of the present application.

[0134] According to some embodiments of the present application, step 120 includes:

[0135] Step 310, coating the slurry of the active material layer on the surface of the substrate where the coating film is formed;

[0136] Step 320, drying the slurry of the active material layer to form an initial active material layer;

[0137] Step 330, extruding the initial active material layer to form the active material layer.

[0138] In step 310, the active material layer slurry can be formed on the surface of the substrate 10 where the film 101 is formed by coating. In some embodiments, the active material layer slurry can include an active material and a binder, and the binder can firmly adhere the active material layer slurry to the surface of the substrate 10.

[0139] The active material can include a positive electrode active material and a negative electrode active material. The positive electrode active material can include at least one of, but is not limited to, lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode active material includes at least one of, but is not limited to, carbon, silicon, metallic lithium, lithium titanate, or a composite negative electrode material, etc.

[0140] Reference Figure 6 and Figure 7 , in some embodiments, a coating mechanism can be used to coat the surface of the substrate 10 to form the active material layer slurry. The conveying device can be a part of the coating mechanism. The coating mechanism has a coating head 50 and a supply system. The coating head 50 is arranged opposite to the coating roller 40. The supply system of the coating mechanism is loaded with the active material slurry. When the substrate 10 passes through the coating roller 40, the active material slurry in the supply system will be conveyed to the coating head 50, and the coating head 50 will evenly release the active material slurry onto the surface of the substrate 10 to form the active material layer slurry.

[0141] In step 320, a drying mechanism can be used to dry the active material layer slurry to cure the active material layer slurry and form an initial active material layer. In this way, the moisture in the active material layer slurry can be reduced, and the residual stress of the active material layer 20 after extrusion can be reduced in the subsequent process, and the rebound of the active material layer 20 can be reduced.

[0142] In some embodiments, the drying mechanism can be an oven, and the oven can be arranged between the winding mechanism and the coating roller 40. After the active material layer slurry is coated on the substrate 10, the moving substrate 10 continues to pass through the oven and is dried.

[0143] In step 330, by extruding the initial active material layer, the density of the active material layer 20 can be increased, the volume of the electrode sheet can be reduced, and thus the energy density of the battery can be improved.

[0144] In some embodiments, the initial active material layer can be extruded to form the active material layer 20 by either a roller pressing process or a calendering process.

[0145] In some embodiments, the roller pressing equipment or the calendering equipment can be arranged between the drying mechanism and the coating roller 40, so that after the substrate 10 is dried, it moves to the roller pressing equipment or the calendering equipment to be extruded.

[0146] In the above technical solution, during the process of moving the substrate 10, the above steps are performed in sequence, which can save process time and improve the preparation efficiency of the electrode sheet.

[0147] According to some embodiments of the present application, the film coating 101 includes adhesive paper, and step 130 includes:

[0148] During the drying process of the substrate 10 and the active material layer slurry, the adhesive paper is heated and separated from the surface of the substrate 10.

[0149] When forming the film coating 101, the sticky side of the adhesive paper can be attached to the substrate 10. During the drying process of the substrate 10 and the active material layer slurry, the sticky side of the adhesive paper loses its stickiness and thus separates from the surface of the substrate 10.

[0150] That is to say, the selected adhesive paper is an adhesive paper that loses its stickiness when heated. In some embodiments, the adhesive paper can lose its stickiness at 50°C to 100°C. Exemplarily, the adhesive paper loses its stickiness at 65°C to 90°C.

[0151] Exemplarily, in some embodiments, the composition of the adhesive layer in the adhesive paper includes but is not limited to at least one of silica gel, polyvinyl alcohol, polyvinylpyrrolidone, and sodium carboxymethylcellulose, so that the adhesive paper loses its stickiness when heated.

[0152] In some embodiments, a tape sticking mechanism can be used to remove the adhesive paper from the release paper, and the sticky adhesive layer in the adhesive paper is exposed due to being removed from the release paper.

[0153] In some embodiments, in order to make the size of the removed adhesive paper conform to the size of the required tab 12, the release paper on which the adhesive paper is located can be pre-cut to obtain the adhesive paper with the required shape and size.

[0154] In some embodiments, the tape sticking mechanism can include a manipulator and a tape sticking component. The manipulator can move the tape sticking component so that the tape sticking component removes the adhesive paper from the release paper and moves the adhesive paper to the position on the substrate 10 where the film coating 101 is to be formed.

[0155] Exemplarily, the tape sticking component can include an adsorption device. The adsorption device can remove the adhesive paper from the release paper by means of negative pressure adsorption and paste it to the position on the substrate 10 where the film coating 101 is to be formed.

[0156] The structure for adsorbing the adhesive paper in the adsorption device includes but is not limited to a suction cup.

[0157] In some embodiments, after drying the substrate 10 and the active material layer slurry, the method further includes: cleaning the surface of the substrate 10 to remove the detached adhesive tape from the surface of the substrate 10. Exemplarily, the detached adhesive tape can be removed from the surface of the substrate 10 by means of blowing or brushing.

[0158] In some embodiments, the oven includes an opposite inlet and an outlet. The substrate 10 enters from the inlet and exits from the outlet after drying treatment. A cleaning mechanism such as an air knife or a brush can be provided on the outlet side of the oven to blow or sweep the detached adhesive tape off the surface of the substrate 10, effectively avoiding damage to the surface of the substrate 10 caused by the adhesive tape.

[0159] In the above technical solution, there is no need to adopt an additional process step to remove the adhesive tape, saving procedures and further improving the preparation efficiency of the electrode sheet. In addition, since the film 101 has detached from the substrate 10 during the drying process, it can, to a certain extent, avoid the problem that the excessive extrusion force on the position of the blank area 102 caused by the presence of the film 101 during the subsequent extrusion step of the substrate 10, resulting in the deformation of the tab 12 formed by the blank area 102 subsequently, so that the electrode sheet has a good morphology to maintain its excellent performance.

[0160] Reference Figure 16 and Figure 17 , Figure 16 is the third flowchart of the electrode sheet manufacturing method according to some embodiments of the present application; Figure 17 is one of the front view structural diagrams corresponding to the step of forming the active material layer in the electrode sheet manufacturing method according to some embodiments of the present application.

[0161] According to some embodiments of the present application, the substrate 10 includes opposite first surface 1 and second surface 2. Forming a plurality of films 101 on the first surface 1 includes:

[0162] Step 410, forming the first film on the first surface through a film forming device;

[0163] Step 420, obtaining the position information of the first film;

[0164] Step 430, controlling the film forming device to sequentially form the remaining films at a preset distance with the position of the first film as the starting reference position based on the position information of the first film.

[0165] In step 410, the film forming device can form the first film at any position on the first surface 1. Exemplarily, the film forming device can form the first film at a position close to the edge of the first surface 1, so that the peripheral area in the subsequently formed active material layer 20 can cover the surface of the film 101.

[0166] In step 420, the position information of the first film coating is obtained, which may be the coordinate information of the first film coating. Exemplarily, a unified coordinate system may be established, and the coordinate information of the first film coating in this coordinate system is obtained to position the first film coating.

[0167] In some embodiments, obtaining the coordinate information of the first film coating may be obtaining the coordinate range of the area where the first film coating is located in this coordinate system.

[0168] In some other embodiments, obtaining the coordinate information of the first film coating may also be obtaining the coordinate information of a certain reference point or a certain side in the first film coating.

[0169] In some embodiments, a first CCD (Charge Coupled Device) camera may be used to position the first film coating to obtain the position information of the first film coating.

[0170] In step 430, according to the coordinate information of the first film coating and a preset distance, the film coating forming device can position the forming positions of the remaining film coatings 101.

[0171] Exemplarily, in the established coordinate system, the X-axis may be the length direction of the substrate 10, and the Y-axis may be the width direction of the substrate 10. Taking the center of the first film coating as a reference point, the coordinate information of the center of the first film coating is obtained as (x1, y1), and the preset distance is d.

[0172] If multiple film coatings 101 are arranged at intervals along the length direction of the substrate 10, the coordinate information of the centers of the remaining film coatings 101 are respectively (x1 + d, y1), (x1 + 2d, y1), (x1 + 3d, y1)..., and so on.

[0173] If multiple film coatings 101 are arranged at intervals along the width direction of the substrate 10, the coordinate information of the centers of the remaining film coatings 101 are respectively (x1, y1 + d), (x1, y1 + 2d), (x1, y1 + 3d)..., and so on.

[0174] In the process of forming the remaining film coatings 101, it is only necessary to sequentially move the centers of the remaining film coatings 101 to the above coordinate positions.

[0175] It can be understood that the above-obtained coordinate information is only an example. In other embodiments, one side of the film coating 101 may also be used as a reference position, the coordinate information of one side of the first film coating is obtained, and based on this coordinate information, the coordinate information of the remaining film coatings 101 is obtained. Subsequently, in the process of forming the remaining film coatings 101, the corresponding sides of the remaining film coatings 101 are sequentially moved to the corresponding coordinates.

[0176] In some embodiments, the film coating forming device may include a control system and a film coating forming component. The control system includes a first CCD camera 61, an image processing unit, and a control unit. The first CCD camera 61 converts an optical signal into a digital signal by capturing a first film coating image to form a digital image. The image processing unit analyzes the image to obtain the coordinate information of the film coating 101 in the image, and sends the coordinate information to the control unit. The control unit calculates the coordinate information of the remaining film coating 101 based on the coordinate information of the first film coating, and controls the movement of the film coating forming component so that the film coating forming component sequentially forms the remaining film coating 101 at the corresponding coordinate positions.

[0177] Exemplarily, the film coating forming component includes a glue sticking mechanism. The control unit drives the glue sticking component to sequentially form the remaining film coating 101 at the corresponding coordinate positions by controlling the movement of the manipulator in the glue sticking mechanism.

[0178] In the above technical solution, among the multiple film coatings 101, the spacing between adjacent film coatings 101 is a fixed spacing, which is beneficial for subsequent cutting of the base material 10 to form pole pieces with consistent specifications. And, in this way, only the first film coating needs to be positioned, and then only the remaining film coatings 101 need to be sequentially formed at fixed preset intervals, so as to form multiple film coatings 101 with a fixed spacing, simplifying the steps of forming the film coating 101 and improving production efficiency.

[0179] Reference Figure 17 And Figure 18 , Figure 18 is the fourth flowchart of the pole piece manufacturing method according to some embodiments of the present application.

[0180] According to some embodiments of the present application, forming multiple film coatings 101 on the first surface 1 further includes:

[0181] Step 431, obtaining a first difference between the interval distance between the currently formed film coating and the previously formed film coating and a preset distance;

[0182] Step 432, in response to the first difference being greater than a preset threshold, controlling the film coating forming device to correct the forming position of the next film coating 101 to be formed, so that the interval distance between the next film coating to be formed and the currently formed film coating is less than or equal to the preset threshold.

[0183] During the process of moving the substrate 10, a plurality of film laminates 101 are sequentially formed on the surface of the substrate 10. Since the substrate 10 is prone to deviation, when the remaining film laminates 101 are sequentially formed at a preset interval, once the substrate 10 deviates, it is likely to cause the interval distance between adjacent film laminates 101 to be inconsistent with the preset distance. Based on this, in the embodiments of the present application, the first difference between the interval distance between the currently formed film laminate 101 and the next to be formed film laminate 101 and the preset distance is obtained, and the interval distance between the next to be formed film laminate 101 and the currently formed film laminate 101 is adjusted based on the first difference being greater than the preset threshold, so that the intervals between the formed plurality of film laminates 101 are fixed intervals or close to fixed intervals.

[0184] The currently formed film laminate refers to the last formed film laminate among the plurality of already formed film laminates. The previously formed film laminate refers to the film laminate formed before the currently formed film laminate. The next to be formed film laminate refers to the next film laminate to be formed after the currently formed film laminate.

[0185] In step 431, after each film laminate 101 is formed, the first difference between the interval distance between the currently formed film laminate and the previously formed film laminate and the preset distance is obtained.

[0186] In some embodiments, a second CCD camera 62 can be used to obtain the first difference. The second CCD camera 62 can be placed above the second formed film laminate 101 of the substrate 10. In this way, the substrate 10 passes through the second CCD camera 62 in sequence, so that after each film laminate 101 is formed, the currently formed film laminate 101 will pass through the second CCD camera 62.

[0187] The second CCD camera 62 takes pictures at preset intervals. The preset time is equal to the preset distance divided by the moving speed of the substrate 10. Since the moving speed of the substrate 10 is fixed and a plurality of film laminates 101 are formed at fixed preset intervals, therefore, each time the second CCD camera 62 takes a picture, the obtained image will include the currently formed film laminate 101. The second CCD camera 62 analyzes the image to obtain the first difference. Exemplarily, the second CCD camera 62 includes alignment coordinates, and marking points are set on the film laminate 101. For example, the center of the film laminate 101 can be used as the marking point. If the first difference is 0, the center of the currently formed film laminate 101 should be aligned with the center of the alignment coordinates. If there is an offset between the center of the currently formed film laminate 101 and the center of the alignment coordinates, the offset amount is the first difference.

[0188] In step 432, in response to the first difference being greater than a preset threshold, the second CCD camera 62 may convert the offset between the center of the currently formed film covering 101 and the center of the alignment coordinates into an electrical signal, and send the electrical signal to the film covering forming device. The film covering forming device adjusts the forming position of the next film covering 101 to be formed based on this offset.

[0189] In some embodiments, the film covering forming device includes a glue pasting mechanism. Then, the robotic arm in the glue pasting mechanism adjusts the movement of the moving glue pasting component based on this electrical signal, thereby adjusting the glue pasting position of the next film covering 101 to be formed.

[0190] Exemplarily, if the interval distance between the currently formed film covering 101 and the previously formed film covering 101 is less than the preset distance, the robotic arm increases the interval distance between the glue pasting position of the next film covering 101 to be formed and the currently formed film covering 101.

[0191] If the interval distance between the currently formed film covering 101 and the previously formed film covering 101 is greater than the preset distance, the robotic arm decreases the interval distance between the glue pasting position of the next film covering 101 to be formed and the currently formed film covering 101.

[0192] Exemplarily, the preset threshold may be 3 mm.

[0193] In the above technical solution, it is beneficial to keep the interval distances between adjacent film coverings 101 consistent, so that the interval distances between adjacent film coverings 101 are fixed interval distances.

[0194] According to some embodiments of the present application, the substrate 10 includes opposite first surface 1 and second surface 2, and step 130 includes:

[0195] Forming a plurality of film coverings 101 on both the first surface 1 and the second surface 2 of the substrate 10, so that after removing the plurality of film coverings 101, a plurality of blank areas 102 are formed on both the first surface 1 and the second surface 2. Among them, in the projection plane parallel to the surface of the substrate 10, the orthographic projections of the plurality of blank areas 102 on the first surface 1 coincide with the orthographic projections of the plurality of blank areas 102 on the second surface 2.

[0196] It can be understood that in the embodiments of the present application, a plurality of film coverings 101 may be formed only on the first surface 1, or only on the second surface 2, or a plurality of film coverings 101 may be formed on both the first surface 1 and the second surface 2.

[0197] When a plurality of coating films 101 are formed on both the first surface 1 and the second surface 2, an active material layer 20 is formed on both the first surface 1 and the second surface 2, and after removing the active material layer 20 on the first surface 1 and the second surface 2, a plurality of blank areas 102 are respectively formed on the first surface 1 and the second surface 2.

[0198] It can be understood that when a plurality of coating films 101 are formed on both the first surface 1 and the second surface 2, the steps of forming a plurality of coating films 101 on the first surface 1 and the steps of forming a plurality of coating films 101 on the second surface 2 can be continuous. That is, after forming a plurality of coating films 101 on the first surface 1, a plurality of coating films 101 are immediately formed on the second surface 2. Then, an active material layer 20 is respectively formed on the first surface 1 and the second surface 2, and the coating films 101 on the first surface 1 and the second surface 2 are removed to form a plurality of blank areas 102.

[0199] Alternatively, the steps of forming a plurality of coating films 101 on the first surface 1 and the steps of forming a plurality of coating films 101 on the second surface 2 may not be continuous. That is, after forming a plurality of coating films 101 on the first surface 1, an active material layer 20 is first formed on the first surface 1, and the coating films 101 on the first surface 1 are removed to form a plurality of blank areas 102. Then, a plurality of coating films 101 are formed on the second surface 2, and an active material layer 20 is formed on the second surface 2. After removing the coating films 101, a plurality of blank areas 102 are formed.

[0200] Or, the sequence of steps of forming a plurality of blank areas 102 on the first surface 1 and forming a plurality of blank areas 102 on the second surface 2 may also not be limited to the sequence exemplified above, as long as a plurality of blank areas 102 can be respectively formed on the first surface 1 and the second surface 2.

[0201] In the projection plane parallel to the surface of the substrate 10, the orthographic projections of the plurality of blank areas 102 on the first surface 1 coincide with the orthographic projections of the plurality of blank areas 102 on the second surface 2. That is, the plurality of blank areas 102 on the first surface 1 and the plurality of blank areas 102 on the second surface 2 are in a one-to-one symmetric structure.

[0202] In the above technical solution, the first surface 1 and the second surface 2 are in a symmetric structure. During the subsequent cutting process of the substrate 10, only by cutting along the cutting area of the first surface 1 or the second surface 2, the structures of the tab 12 and the main body portion 11 on the first surface 1 and the second surface 2 can be made consistent, which is beneficial to improving the performance of the electrode sheet. And because the coating films 101 are formed on both the first surface 1 and the second surface 2 before forming the active material layer 20, the flatness of the active material layer 20 on both the first surface 1 and the second surface 2 is relatively high. After using this electrode sheet to form an electrode assembly, it is beneficial to further improve the stability of the performance of the electrode assembly.

[0203] Reference Figure 19 and Figure 20 , Figure 19 is the fifth flowchart of the method for manufacturing a pole piece according to some embodiments of the present application; Figure 20 is the second front view structural schematic diagram corresponding to the step of forming the active material layer in the method for manufacturing a pole piece according to some embodiments of the present application.

[0204] According to some embodiments of the present application, a plurality of blank areas 102 on the first surface 1 are formed prior to a plurality of blank areas 102 on the second surface 2. Forming a plurality of blank areas 102 on the second surface 2 includes:

[0205] Step 510, obtaining the position information of each blank area 102 on the first surface 1, and forming a plurality of coating films 101 on the second surface 2 that correspond one-to-one with the positions of the plurality of blank areas 102 on the first surface 1 based on the obtained position information of the blank areas 102;

[0206] Step 520, forming an active material layer 20 on the second surface 2;

[0207] Step 530, removing the coating film 101 on the second surface 2 to form a plurality of blank areas 102 on the second surface 2.

[0208] That is to say, first, steps 110 to 130 are performed on the first surface 1 to form a plurality of blank areas 102.

[0209] After that, steps 110 to 130 are performed on the second surface 2 to form a plurality of blank areas 102.

[0210] In step 510, the coordinate information of each blank area 102 can be obtained as the position information, and this coordinate information is the position to be formed of the coating film 101 to be formed on the second surface 2. This coordinate information can be two-dimensional coordinate information. The abscissa in the coordinate information can be the length direction of the substrate 10, and the ordinate can be the width direction of the substrate 10. It can be understood that the first surface 1 and the second surface 2 are two opposite surfaces of the substrate 10 itself. In the same coordinate system, the two-dimensional coordinates of the first surface 1 are the same as those of the second surface 2. Therefore, using the coordinate information of the blank area 102 on the first surface 1 as the position to be formed of the coating film 101 to be formed on the second surface 2 enables the orthographic projection of the coating film 101 on the second surface 2 on the projection plane parallel to the surface of the substrate 10 to coincide with the orthographic projection of the blank area 102 on the first surface 1 on the projection plane parallel to the surface of the substrate 10.

[0211] In some embodiments, a third CCD camera 63 can be used to obtain the coordinate information of the blank area 102 on the first surface 1.

[0212] In some embodiments, the coordinate information of all blank areas 102 of the first surface 1 may be obtained first. Then, based on the coordinate information of different obtained blank areas 102, a plurality of coating films 101 are respectively formed on the corresponding second surface 2.

[0213] In other embodiments, for each obtained coordinate information of a blank area 102 of the first surface 1, a corresponding coating film 101 is formed on the second surface 2 until a plurality of coating films 101 corresponding one-to-one to the positions of the plurality of blank areas 102 of the first surface 1 are formed.

[0214] For the description of the coating film forming device forming the coating film 101 based on the coordinate information, reference may be made to the above relevant description, which will not be elaborated hereinafter.

[0215] In step 520, for the method of forming the active material layer 20 on the second surface 2, reference may be made to the description of the method of forming the active material layer 20 on the first surface 1 above, which will not be elaborated hereinafter.

[0216] In step 530, for the description of the method of removing the coating film 101 on the second surface 2, reference may be made to the description of the method of removing the coating film 101 on the first surface 1 above, which will not be elaborated hereinafter.

[0217] In the above technical solution, by respectively positioning the forming positions of each coating film 101 on the second surface 2 based on the actual position information of the plurality of blank areas 102 formed on the first surface 1, the probability that the blank areas 102 formed on the second surface 2 and the blank areas 102 formed on the first surface 1 are symmetric structures can be greatly improved, and the consistency of the structures of the first surface 1 and the second surface 2 is improved.

[0218] Reference Figure 21 , Figure 21 is the sixth flowchart of the method for manufacturing a pole piece according to some embodiments of the present application.

[0219] According to some embodiments of the present application, step 140 includes:

[0220] Step 610, determining a cutting line of the substrate 10, the cutting line being used to form a cutting area of the substrate 10, and the cutting area at least including the substrate 10 between adjacent blank areas 102;

[0221] Step 620, cutting the substrate 10 along the cutting line.

[0222] As Figure 8 shown, in some embodiments, the cutting line may include a first cutting line 71. By cutting the substrate 10 along the first cutting line 71, the obtained pole piece includes: a main body portion 11 and a plurality of pole ears 12 located on at least one side of the main body portion 11.

[0223] The cutting area formed by the first cutting line 71 may only include the substrate 10 between adjacent blank areas 102. The first cutting line 71 may include a straight segment and a bent segment. The straight segment is located between adjacent blank areas 102 and extends along the arrangement direction of the adjacent blank areas 102. The bent segment protrudes compared to the straight segment, and the bent segment is bent into a rectangular shape and coincides with three sides of the blank area 102.

[0224] As Figure 8 shown, the bent segment may also be located in the blank area 102 and is disposed adjacent to the edge of the blank area 102. That is, the cutting area formed by the first cutting line 71 may also include a part of the edge portion of the blank area 102, so that when the substrate 10 is actually cut, a part of the blank area 102 can also be cut. This is because, in the cutting process, there may be cutting errors. If the first cutting line 71 completely coincides with the edge of the blank area 102, during actual cutting, it may not be completely cut along the first cutting line 71, resulting in the substrate 10 between adjacent blank areas 102 not being completely removed, and thus a part of the active material layer 20 remains on the formed tab 12. Based on this, setting the cutting area to also include the edge portion of the blank area 102, in this way, when actually cutting, a part of the blank area 102 can be cut more, which can ensure to a certain extent that the substrate 10 between adjacent blank areas 102 is removed.

[0225] It can be understood that in the case where the coating film 101 is located in the peripheral area of the active material layer 20, the active material layer 20 between adjacent blank areas 102 is also located in the peripheral area. That is, the active material layer 20 between adjacent blank areas 102 is also a thinned area. Removing the substrate 10 between adjacent blank areas 102, along with removing the active material layer 20 on the substrate 10 between adjacent blank areas 102, can thus remove the remaining thinned areas in the active material layer 20 and make the formed adjacent tabs 12 disconnected from each other.

[0226] As Figure 9 shown, in some other embodiments, the cutting line further includes a second cutting line 72. The second cutting line 72 is located between adjacent blank areas 102 and extends in a direction perpendicular to the arrangement direction of the adjacent blank areas 102. Exemplarily, if a plurality of blank areas 102 extend along the length direction of the substrate 10, then the second cutting line 72 extends along the width direction of the substrate 10.

[0227] There may be multiple second cutting lines 72. Each second cutting line 72 is located between adjacent blank areas 102. After cutting along the first cutting line 71 and then cutting along the second cutting line 72, a plurality of pole pieces can be obtained, and each pole piece includes: a main body portion 11 and a tab 12 located on at least one side of the main body portion 11.

[0228] In some embodiments, the substrate 10 may be cut along the first cutting line 71 by a die-cutting process, and the substrate 10 may be cut along the second cutting line 72 by a trimming process.

[0229] In the above technical solution, not only can the adjacent blank areas 102 be disconnected to respectively form the tabs 12, but also the thinner regions of the active material layer 20 on the substrate 10 between the adjacent blank areas 102 can be removed, so that the overall thickness of the remaining active material layer 20 is relatively consistent.

[0230] Reference Figures 6 to 10 , an electrode sheet manufacturing apparatus is provided in an embodiment of the present application, which includes: a conveying device for moving the substrate; a film laminating forming device for sequentially forming a plurality of spaced-apart films 101 on at least one surface of the substrate 10 along the moving direction of the substrate during the movement of the substrate; a deviation correcting device for detecting the moving trajectory of the substrate during the movement of the substrate, and correcting the moving direction of the substrate based on the detected deviation of the moving trajectory of the substrate from a preset trajectory, so that the substrate moves along the preset trajectory; an active material layer forming device for forming an active material layer 20 on at least a part of the surface of the substrate 10 on which the film 101 is formed, and the active material layer 20 covers the surface of the film 101; a cutting device for cutting the substrate 10 after removing the film 101, so that the substrate 10 forms the tabs 12 of the electrode sheet in the area covered by the film 101, and the remaining part of the substrate 10 with the active material layer 20 forms the main body 11 of the electrode sheet, and the tabs 12 are located on at least one side of the main body 11.

[0231] The film laminating forming device may be used to execute step 110 in the above embodiment. The active material layer forming device may be used to execute step 120 in the above embodiment. The cutting device may be used to execute step 140 in the above embodiment.

[0232] For the structures of the film 101, the substrate 10, the active material layer 20, and the formed electrode sheet, reference may be made to the relevant descriptions in the above embodiments, and details are not described herein again.

[0233] The conveying device and the deviation correcting device may be used to execute step 110 in the above embodiment.

[0234] The conveying device may include an unwinding mechanism, a winding mechanism, and a guide roller 30. One end of the substrate 10 may be wound around the unwinding mechanism, and the other end of the substrate 10 passes through the guide roller 30 and is wound around the winding mechanism. The winding mechanism pulls the substrate 10 to realize the movement of the substrate 10.

[0235] The deviation correction device can be any structure well-known to those skilled in the art that can correct the moving direction of the moving substrate 10. Exemplarily, the deviation correction device can include two sensors, a controller, and a deviation correction roller. The sensors can be located on opposite sides of the substrate 10 and are used to detect the distance between the substrate 10 and themselves. The deviation correction roller is used to guide the moving direction of the substrate 10. If the substrate 10 moves along a preset trajectory, the distances detected by the two sensors are the same. If there is a deviation in the distances detected by the two sensors, it indicates that the substrate 10 has shifted. The sensors send the detected distances to the controller. After receiving the data, the controller calculates the moving angle of the deviation correction roller according to a preset algorithm and program to correct the movement of the substrate 10.

[0236] In some embodiments, the film forming device can be arranged facing the moving path of the substrate 10. Exemplarily, the film forming device can be correspondingly placed at a position between the unwinding mechanism and the guiding roller 30, so as to be able to form a film 101 on the substrate 10 during the movement of the substrate 10.

[0237] The cutting device can be a die-cutting device or a cutting device to perform die-cutting or cutting on the substrate 10.

[0238] In the above technical solution, the position where the film 101 is located is the position of the tab 12. During the process of removing the film 101, the thinner regions in the active material layer 20 formed at the position of the tab 12 can be synchronously removed, so that the thickness of the active material layer 20 at the edge of the formed tab 12 is the same as the thickness of the active material layer 20 of the main body portion 11, improving the flatness of the main body portion 11 of the electrode sheet. Among them, by controlling the substrate 10 to move along a preset trajectory, it is beneficial to control the position of the formed active material layer to meet the expectation, so that the positional relationship between it and the multiple films 101 meets the expectation, which is beneficial to improving the flatness of the main body portion 11. At the same time, since the adjacent films 101 are spaced apart from each other in the embodiments of the present application, even if the substrate is corrected during the formation of multiple films and the substrate 10 shifts, the formed films will not pull on the substrate, thus not causing problems such as the substrate 10 breaking or wrinkling, and thus being able to ensure the integrity of the morphology of the electrode sheet to a certain extent, enabling the electrode sheet to maintain good performance and overall improving the yield of the electrode sheet.

[0239] According to some embodiments of the present application, multiple films 101 are located in the peripheral region of the active material layer 20.

[0240] The definition of the peripheral region can refer to the relevant description in the above embodiments and will not be elaborated below.

[0241] The position of the multiple films 101 in the peripheral region of the active material layer 20 can refer to the relevant description in the above embodiments and will not be elaborated below.

[0242] In the above technical solution, the peripheral region with a smaller thickness in the active material layer 20 can cover the surface of the coating film 101. Subsequently, when the coating film 101 is removed, the part with a smaller thickness in the active material layer 20 can be smoothly removed, so that the thickness of the remaining part in the active material layer 20 is relatively consistent, further improving the flatness of the main body 11.

[0243] According to some embodiments of the present application, the active material layer forming device includes: a coating mechanism configured to coat an active material layer slurry on the surface of the moving substrate 10 where the coating film 101 is formed; a drying mechanism for drying the active material layer slurry on the surface of the moving substrate 10 to form an initial active material layer; and an extrusion mechanism for extruding the initial active material layer to form the active material layer 20.

[0244] The coating mechanism can be used to perform step 310 in the above embodiments, the drying mechanism can be used to perform step 320 in the above embodiments, and the extrusion mechanism can be used to perform step 330 in the above embodiments.

[0245] Regarding the structures of the coating mechanism and the drying mechanism, as well as the method of coating the active material layer slurry on the substrate 10 by the coating mechanism and the method of drying the active material layer slurry by the drying mechanism, reference can be made to the relevant descriptions in the above embodiments, which will not be elaborated below.

[0246] The extrusion mechanism can be any one of a rolling device or a calendering device. The rolling device can perform rolling treatment on the active material layer slurry, and the calendering device can perform calendering treatment on the active material layer slurry.

[0247] Both the rolling device and the calendering device are well-known devices to those skilled in the art.

[0248] In the above technical solution, the coating mechanism, the drying mechanism, and the extrusion mechanism sequentially process the substrate 10 during the movement of the substrate 10, which can save process time and improve the preparation efficiency of the electrode sheet.

[0249] According to some embodiments of the present application, the substrate 10 includes: opposite first surface 1 and second surface 2. The coating film forming device is used to form a plurality of coating films 101 on the first surface 1. The electrode sheet manufacturing equipment further includes: a positioning mechanism for obtaining the position information of the first coating film formed on the surface of the substrate 10 by the coating film forming device; and the coating film forming device is used to sequentially form the remaining coating films 101 at a preset distance based on the position information of the first coating film with the position of the first coating film as the starting reference position.

[0250] The method for forming a plurality of coating films 101 on the first surface 1 by the coating film forming device may refer to the relevant description of the method for forming a plurality of coating films 101 on the first surface 1 in the above embodiments.

[0251] The positioning mechanism can be used to perform step 420 in the above embodiments.

[0252] Reference Figure 17 , the positioning mechanism may include a first CCD camera 61. The coating film forming device may include a control system and a coating film forming component. The control system includes a first CCD camera 61, an image processing unit, and a control unit. The first CCD camera 61 converts the optical signal into a digital signal by taking a first coating film image to form a digital image. The image processing unit analyzes the image, obtains the coordinate information of the coating film 101 in the image, and sends the coordinate information to the control unit. The control unit calculates the coordinate information of the remaining coating films 101 based on the coordinate information of the first coating film, and controls the movement of the coating film forming component so that the coating film forming component sequentially forms the remaining coating films 101 at the corresponding coordinate positions.

[0253] In the above technical solution, among the plurality of coating films 101, the distance between adjacent coating films 101 is a fixed distance, which is beneficial to subsequent cutting of the substrate 10 to form pole pieces with consistent specifications.

[0254] According to some embodiments of the present application, the positioning mechanism is further used to obtain the position information of each blank area 102 on the first surface 1 after a plurality of coating films 101 on the first surface 1 are removed to form a plurality of blank areas 102. Moreover, the coating film forming device is further used to form a plurality of coating films 101 on the second surface 2 that correspond one-to-one with the positions of the plurality of blank areas 102 on the first surface 1 based on the position information of the blank areas 102.

[0255] The positioning mechanism can also be used to perform step 510 in the above embodiments. The method for the positioning mechanism and the coating film forming device to form a plurality of coating films 101 on the second surface 2 may refer to the relevant description of step 510 in the above embodiments, and will not be elaborated herein.

[0256] Reference Figure 20 , wherein, the positioning mechanism may include a third CCD camera 63, and the coordinate information of the blank area 102 on the first surface 1 is obtained through the third CCD camera 63.

[0257] The third CCD camera 63 and the first CCD camera 61 can be respectively located on two opposite surfaces of the base material 10. In the step of forming the coating film 101 on the first surface 1, the first surface 1 is arranged facing the first CCD camera 61 so that the first CCD camera 61 can obtain the position information of the first coating film formed on the first surface 1. In the step of forming the coating film 101 on the second surface 2, the first surface 1 is arranged facing the third CCD camera 63 so that the third CCD camera 63 can respectively obtain the position information of each blank area 102 on the first surface 1.

[0258] In the above technical solution, the probability that the blank area 102 formed on the second surface 2 is symmetric with the blank area 102 formed on the first surface 1 can be greatly improved, and the consistency of the structures of the first surface 1 and the second surface 2 can be improved.

[0259] According to some embodiments of the present application, the pole piece manufacturing equipment further includes: a measuring mechanism for obtaining a first difference between the interval distance between the currently formed coating film 101 and the previously formed coating film 101 and a preset distance; a coating film forming device for correcting the forming position of the next coating film 101 to be formed in response to the first difference being greater than a preset threshold, so that the interval distance between the next coating film 101 to be formed and the currently formed coating film 101 is less than or equal to the preset threshold.

[0260] The measuring mechanism can be used to execute step 431 in the above embodiments, and the coating film forming device can also be used to execute step 432 in the above embodiments. The method for the measuring machine to obtain the first difference between the interval distance between the currently formed coating film 101 and the previously formed coating film 101 and the preset distance can refer to the relevant description of step 431 in the above embodiments, and the method for the coating film forming device to correct the forming position of the next coating film 101 to be formed in response to the first difference being greater than the preset threshold can refer to the relevant description of step 432 in the above embodiments.

[0261] Reference Figure 17 , wherein, the measuring device can include a second CCD camera 62, and the second CCD camera 62 can be located on the same side of the base material 10 as the first CCD camera 61 and arranged at intervals. In this way, in the step of forming the coating film 101 on the first surface 1, the second CCD is also arranged facing the first surface 1 so that the second CCD can detect the position of the currently formed coating film 101.

[0262] In the above technical solution, by obtaining the first difference through the measuring device and the coating film forming device correcting the forming position of the next coating film 101 to be formed in response to the first difference being greater than the preset threshold, it is beneficial to keep the interval distance between adjacent coating films 101 consistent, so that the distance between adjacent coating films 101 is a fixed distance.

[0263] According to some embodiments of the present application, the coating film 101 is an adhesive tape, and the coating film forming device includes an adhesive tape pasting mechanism.

[0264] For the structure of the adhesive tape pasting mechanism, the method of pasting the adhesive tape, and the structure of the adhesive tape, reference can be made to the relevant descriptions in the above embodiments, which will not be elaborated hereinafter.

[0265] The adhesive tape pasting mechanism only needs to paste the adhesive tape onto the substrate 10, simplifying the steps of forming the coating film 101. In addition, using the adhesive tape enables the adhesive tape to be thermally separated from the substrate 10 during the drying process of the substrate 10 by the drying mechanism, eliminating the need for additional processes to remove the adhesive tape, saving procedures and improving the preparation efficiency of the electrode sheet. Moreover, in the subsequent step of extruding the substrate 10 by the extrusion mechanism, it is possible to avoid, to a certain extent, the problem that the excessive extrusion force on the position of the blank area 102 caused by the presence of the coating film 101 leads to the deformation of the tab 12 formed by the subsequent blank area 102, enabling the electrode sheet to have a good morphology to maintain its excellent performance.

[0266] The embodiments of the present application provide an electrode sheet manufactured by using the electrode sheet manufacturing method in the above embodiments or manufactured by using the electrode sheet manufacturing equipment in the above embodiments.

[0267] The electrode sheet includes a main body portion and tabs. The tabs can be located on one side of the main body portion or on opposite sides of the main body portion. A plurality of spaced-apart tabs can be connected to one side of the main body portion, or there can be only one tab on one side of the main body portion.

[0268] The electrode sheet can include a positive electrode sheet and a negative electrode sheet. A positive electrode active material layer is formed on the main body portion of the positive electrode sheet, and a negative electrode active material layer is formed on the main body portion of the negative electrode sheet. For the descriptions of the positive electrode active material layer and the negative electrode active material layer, reference can be made to the relevant descriptions in the above embodiments.

[0269] By improving the flatness of the main body portion of the electrode sheet, it is beneficial to improve the reliability and stability of the battery assembly after the subsequent formation of the battery assembly.

[0270] The embodiments of the present application provide a battery cell including the electrode sheet in the above embodiments.

[0271] The battery cell can include an end cap, a housing, an electrode assembly, and other functional components.

[0272] The end cap refers to a component that covers the opening of the housing to isolate the internal environment of the battery cell from the external environment. Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used to electrically connect to the electrode assembly for outputting or inputting the electrical energy of the battery cell.

[0273] The housing is a component used to cooperate with the end cap to form the internal environment of the battery cell.

[0274] The electrode assembly is a component in a battery cell where electrochemical reactions occur. The housing can contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab connects to the electrode terminal to form a current loop.

[0275] The battery cell can be a solid-state battery cell, and a solid electrolyte is further included between the positive electrode sheet and the negative electrode sheet of the electrode assembly of the solid-state battery cell.

[0276] Since the flatness of the main body of the electrode sheet is improved, the flatness of the battery cell is relatively high. When the battery cell is under pressure, the force on the battery cell is relatively uniform, greatly reducing the phenomenon of the battery cell being crushed or cracked, thereby improving the use stability of the battery cell.

[0277] The embodiment of the present application provides a battery, which includes the battery cell in the above embodiment.

[0278] In the battery, there can be multiple battery cells. The multiple battery cells can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells is accommodated in a box; of course, the battery can also be in the form that multiple battery cells are first connected in series, in parallel, or in a hybrid connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in a box. The battery can also include other structures. For example, the battery can also include a busbar component for realizing the electrical connection among the multiple battery cells.

[0279] The battery can be a solid-state battery.

[0280] The embodiment of the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0281] The description of the electrical device can refer to the relevant description in the above embodiment, and will not be elaborated below.

[0282] The embodiment of the present application provides a method for manufacturing an electrode sheet, referring to Figures 6 to 10 , Figure 17 and Figure 20 , including:

[0283] Step 110: During the movement of the substrate 10, along the moving direction of the substrate 10, a plurality of film coatings 101 spaced apart from each other are sequentially formed on at least one surface of the substrate 10. During the movement of the substrate 10, the moving trajectory of the substrate 10 is detected, and based on the detected deviation of the moving trajectory of the substrate 10 from the preset trajectory, the moving direction of the substrate 10 is corrected so that the substrate 10 moves along the preset trajectory;

[0284] Step 120: An active material layer 20 is formed on at least a part of the surface of the substrate 10 where the film coating 101 is formed, and the active material layer 20 covers the surface of the film coating 101;

[0285] Step 130: The plurality of film coatings 101 are removed to form a plurality of blank areas 102 on the surface of the substrate 10;

[0286] Step 140: The substrate 10 is cut so that the substrate 10 forms the tabs 12 of the electrode in the plurality of blank areas 102 respectively, and the remaining part of the substrate 10 with the active material layer 20 forms the main body 11 of the electrode, and the tabs 12 are located on at least one side of the main body 11.

[0287] In step 110, the plurality of film coatings 101 are located in the peripheral area of the active material layer 20.

[0288] Step 120 includes:

[0289] Step 310: Coating the slurry of the active material layer on the surface of the substrate 10 where the film coating 101 is formed;

[0290] Step 320: Drying the slurry of the active material layer to form an initial active material layer;

[0291] Step 330: Extruding the initial active material layer to form the active material layer 20.

[0292] Step 130 includes:

[0293] Using a heat-debonding adhesive tape, during the drying process of the substrate 10 and the slurry of the active material layer, the adhesive tape is heated and detached from the surface of the substrate 10.

[0294] In step 110, the substrate 10 includes opposite first surface 1 and second surface 2. Forming a plurality of film coatings 101 on the first surface 1 includes:

[0295] Step 410: Forming the first film coating on the first surface 1 through a film coating forming device;

[0296] Step 420: Obtaining the position information of the first film coating;

[0297] Step 430: Based on the position information of the first coating film, with the position of the first coating film as the starting reference position, the coating film forming device sequentially forms the remaining coating films 101 at a preset distance interval.

[0298] Forming a plurality of coating films 101 on the first surface 1 further includes:

[0299] Step 431: Obtain a first difference between the interval distance between the currently formed coating film 101 and the previously formed coating film 101 and the preset distance;

[0300] Step 432: In response to the first difference being greater than the preset threshold, the coating film forming device corrects the forming position of the next coating film 101 to be formed, so that the interval distance between the next coating film 101 to be formed and the currently formed coating film 101 is less than or equal to the preset threshold.

[0301] The substrate 10 includes opposite first surface 1 and second surface 2, and step 130 includes:

[0302] Form a plurality of coating films 101 on both the first surface 1 and the second surface 2 of the substrate 10, so that after removing the plurality of coating films 101, a plurality of blank areas 102 are formed on both the first surface 1 and the second surface 2. Among them, in the projection plane parallel to the surface of the substrate 10, the orthographic projections of the plurality of blank areas 102 on the first surface 1 coincide with the orthographic projections of the plurality of blank areas 102 on the second surface 2.

[0303] Among them, the plurality of blank areas 102 on the first surface 1 are formed prior to the plurality of blank areas 102 on the second surface 2. Forming the plurality of blank areas 102 on the second surface 2 includes:

[0304] Step 510: Obtain the position information of each blank area 102 on the first surface 1, and based on the obtained position information of the blank areas 102, form a plurality of coating films 101 on the second surface 2 that correspond one-to-one with the positions of the plurality of blank areas 102 on the first surface 1;

[0305] Step 520: Form an active material layer 20 on the second surface 2;

[0306] Step 530: Remove the coating films 101 on the second surface 2 to form a plurality of blank areas 102 on the second surface 2.

[0307] Step 140 includes:

[0308] Step 610: Determine the cutting line of the substrate 10. The cutting line is used to form a cutting area of the substrate 10, and the cutting area includes at least the substrate 10 between adjacent blank areas 102;

[0309] Step 620: Cut the substrate 10 along the cutting line.

[0310] In step 610, the cutting line may include a first cutting line 71 and a second cutting line 72. The first cutting line 71 may include a straight segment and a bent segment. The straight segment is located between adjacent blank areas 102 and extends along the arrangement direction of the adjacent blank areas 102. The bent segment protrudes compared to the straight segment, and the bent segment is bent into a rectangular shape and coincides with three sides of the blank area 102.

[0311] The second cutting line 72 is located between adjacent blank areas 102 and extends along a direction perpendicular to the arrangement direction of the adjacent blank areas 102. There may be multiple second cutting lines 72, and each second cutting line 72 is located between adjacent blank areas 102.

[0312] In step 620, after cutting along the first cutting line 71 and then cutting along the second cutting line 72, a plurality of pole pieces can be obtained, and each pole piece includes: a main body portion 11 and at least one pole ear 12 located on at least one side of the main body portion 11. The substrate 10 can be cut along the first cutting line 71 by a die-cutting process, and the substrate 10 can be cut along the second cutting line 72 by a cutting process.

[0313] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some 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 all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for manufacturing an electrode sheet, characterized in that, The method includes: During the movement of the substrate, along the movement direction of the substrate, a plurality of film laminates spaced from each other are sequentially formed on at least one surface of the substrate, and during the movement of the substrate, the movement trajectory of the substrate is detected, and based on the detected movement trajectory of the substrate deviating from a preset trajectory, the movement direction of the substrate is corrected so that the substrate moves along the preset trajectory; An active material layer is formed on at least a part of the surface of the substrate on which the film laminate is formed, the active material layer covers the surface of the film laminate, and the plurality of film laminates are located in the peripheral area of the active material layer; The plurality of film laminates are removed to form a plurality of blank areas on the surface of the substrate; wherein, the substrate includes opposite first and second surfaces, and the removing the plurality of film laminates to form a plurality of blank areas on the surface of the substrate includes: The plurality of film laminates are formed on both the first surface and the second surface of the substrate so that after the plurality of film laminates are removed, the plurality of blank areas are formed on both the first surface and the second surface, and wherein, in a projection plane parallel to the surface of the substrate, the orthographic projection of the plurality of blank areas on the first surface coincides with the orthographic projection of the plurality of blank areas on the second surface; The plurality of blank areas on the first surface are formed prior to the plurality of blank areas on the second surface, and forming the plurality of blank areas on the second surface includes: Using a third CCD camera to obtain the coordinate information of the blank areas on the first surface, and the coordinate information of the blank areas on the first surface is used as the position where the film laminate on the second surface is to be formed, and for each piece of coordinate information of the blank areas on the first surface obtained, a corresponding film laminate is formed on the second surface; wherein, in the step of forming the film laminate on the second surface, the first surface is arranged facing the third CCD camera; An active material layer is formed on the second surface; The film laminates on the second surface are removed to form the plurality of blank areas on the second surface; The method further includes: Cutting the substrate so that the substrate forms the tabs of the electrode plate respectively in the plurality of blank areas, and the remaining part of the substrate with the active material layer forms the main body part of the electrode plate, and the tabs are located on at least one side of the main body part.

2. The method for manufacturing a pole piece according to claim 1, characterized in that The forming an active material layer on at least a part of the surface of the substrate on which the film laminate is formed includes: Forming the active material layer on at least a part of the surface of the moving substrate on which the film laminate is formed.

3. The method for manufacturing an electrode sheet according to claim 2, characterized in that, The forming an active material layer on at least a part of the surface of the substrate on which the film laminate is formed includes: Coating an active material layer slurry on the surface of the substrate on which the film laminate is formed; Performing a drying treatment on the active material layer slurry to form an initial active material layer; Performing an extrusion on the initial active material layer to form the active material layer.

4. The method for manufacturing a pole piece according to claim 3, characterized in that, The film laminate includes adhesive paper, and the removing the plurality of film laminates includes: During the drying treatment of the substrate and the active material layer slurry, heating the adhesive paper to make it detach from the surface of the substrate.

5. The method for manufacturing a pole piece according to claim 1, wherein, The substrate includes opposite first and second surfaces. Forming the plurality of coating films on the first surface includes: Forming a first coating film on the first surface by a coating film forming device; Obtaining position information of the first coating film; Controlling the coating film forming device to sequentially form the remaining coating films at a preset distance interval with the position of the first coating film as the starting reference position based on the position information of the first coating film.

6. The method for manufacturing a pole piece according to claim 5, wherein, Forming the plurality of coating films on the first surface further includes: Obtaining a first difference between an interval distance between the currently formed coating film and the previously formed coating film and the preset distance; In response to the first difference being greater than a preset threshold, controlling the coating film forming device to correct the forming position of the next coating film to be formed so that the interval distance between the next coating film to be formed and the currently formed coating film is equal to the preset distance.

7. The method for manufacturing a pole piece according to any one of claims 1-6, characterized in that, Cutting the substrate includes: Determining a cutting line of the substrate, the cutting line being used to form a cutting area of the substrate, the cutting area at least including the substrate between adjacent blank areas; Cutting the substrate along the cutting line.

8. A pole piece manufacturing device, characterized in that, Including: A conveying device for moving the substrate; A coating film forming device for sequentially forming a plurality of mutually spaced coating films on at least one surface of the substrate along the moving direction of the substrate during the movement of the substrate; wherein, the substrate includes opposite first and second surfaces, and the coating film forming device is used to form the plurality of coating films on the first surface; A deviation correction device for detecting the moving trajectory of the substrate during the movement of the substrate and correcting the moving direction of the substrate based on the detected deviation of the moving trajectory of the substrate from a preset trajectory so that the substrate moves along the preset trajectory; An active material layer forming device for forming an active material layer on at least a part of the surface of the substrate where the coating film is formed, the active material layer covering the surface of the coating film, and the plurality of coating films being located in the peripheral area of the active material layer; A positioning mechanism including a third CCD camera for obtaining coordinate information of the blank areas on the first surface after the plurality of coating films on the first surface are removed to form a plurality of blank areas, and the coordinate information of the blank areas on the first surface is used as the position to be formed of the coating film on the second surface. Wherein, in the step of forming the coating film on the second surface, the first surface is arranged facing the third CCD camera, and the coating film forming device is configured to form the corresponding coating film on the second surface every time the coordinate information of a blank area on the first surface is obtained; A cutting device for cutting the substrate after removing the coating film so that the substrate forms a tab of the electrode plate in the area covered by the coating film, and the remaining part of the substrate with the active material layer forms the main body part of the electrode plate, and the tab is located on at least one side of the main body part.

9. The pole piece manufacturing equipment according to claim 8, characterized in that, The active material layer forming device includes: A coating mechanism, configured to coat a slurry of an active material layer on the surface of the moving substrate where the film coating is formed; A drying mechanism, used to dry the slurry of the active material layer on the surface of the moving substrate to form an initial active material layer; An extrusion mechanism, used to extrude the initial active material layer to form the active material layer.

10. The pole piece manufacturing equipment according to claim 8 or 9, characterized in that, The positioning mechanism is further configured to obtain the position information of the first film coating formed by the film coating forming device on the surface of the substrate; 11. The pole piece manufacturing equipment according to claim 10, characterized in that, The film coating forming device is configured to sequentially form the remaining film coatings at a preset distance interval with the position of the first film coating as the starting reference position based on the position information of the first film coating. The electrode sheet manufacturing equipment further includes: A measuring mechanism, configured to obtain a first difference between the interval distance between the currently formed film coating and the previously formed film coating and the preset distance; 12. The pole piece manufacturing equipment according to claim 8 or 9, characterized in that, The film coating forming device is configured to correct the forming position of the next film coating to be formed in response to the first difference being greater than a preset threshold, so that the interval distance between the next film coating to be formed and the currently formed film coating is equal to the preset distance.

13. A pole piece, characterized in that, The film coating is a sticker, and the film coating forming device includes a sticker pasting mechanism.

14. A battery cell, characterized in that, Manufactured by using the electrode sheet manufacturing method according to any one of claims 1-7 above, or manufactured by using the electrode sheet manufacturing equipment according to any one of claims 8-12 above.

15. A battery, characterized in that, Including the electrode sheet according to claim 13.

16. An electrical device, characterized in that, Including the battery cell according to claim 14. The electrical device includes the battery according to claim 15, and the battery is used to provide electrical energy.

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