Coating equipment, battery production line and coating method

Abstract

The invention discloses coating equipment, a battery production line and a coating method, and the coating equipment comprises a transmission roller which is configured to transmit a current collector to be coated with an active substance along a preset path; the coating part and the transmission roller are arranged at intervals in the radial direction of the transmission roller, and the coating part is configured to coat the surface of the current collector wound on the transmission roller with an active substance so as to form a film area coated with the active substance and a blank area not coated with the active substance on the surface of the current collector, and the film area and the blank area are arranged side by side in the width direction of the current collector; the width direction is perpendicular to a preset path; the measuring device is used for detecting the boundary of the film area and the blank area on the two surfaces of the current collector in the width direction and / or the position of the edge of the current collector in the width direction and obtaining the position difference value of the boundary of the two surfaces of the current collector, and the measuring device is arranged at one end, close to the coating component, of the preset path.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a coating device, a battery production line and a coating method. Background Art

[0002] The lithium battery coating process is a process of evenly coating the electrode materials (positive electrode, negative electrode) composed of the stirred active material on the conductive substrate (copper foil, aluminum foil, etc.) as the current collector. This process requires the formation of a uniform, smooth and dense electrode layer to improve the performance and stability of the lithium battery.

[0003] When double-sided coating is applied, due to the influence of slurry consistency, equipment stability, tension system, etc., there is a position difference (AB surface misalignment) between the active materials coated on the front and back sides of the current collector. Summary of the invention

[0004] The present application aims to provide a coating device, a battery production line and a coating method, so as to improve the problem of deviation in the distance between the membrane areas formed by the active materials coated on both sides existing in the prior art.

[0005] According to one aspect of the present application, a coating device is provided, which includes: a conveying roller, configured to convey a current collector to be coated with an active material along a predetermined path; a coating component, spaced apart from the conveying roller in the radial direction of the conveying roller, and configured to coat the active material onto the surface of the current collector wound on the conveying roller, so as to form a film area coated with the active material and a blank area not coated with the active material arranged side by side along the width direction of the current collector on the surface of the current collector, wherein the width direction is perpendicular to the predetermined path; a measuring device, arranged at one end of the predetermined path close to the coating component, the measuring device being configured to respectively detect the boundaries of the film area and the blank area on both sides of the current collector in the width direction and / or respectively detect the position of the edge of the current collector in the width direction, and obtain the position difference of the boundaries on both sides of the current collector, and the measuring device is arranged at one end of the predetermined path close to the coating component.

[0006] In some embodiments, the measuring device includes two position detection units, which respectively detect the positions of the boundaries and / or edges of the two sides of the current collector in the width direction; the coating equipment also includes a control device, which is signal-connected to the two position detection units, respectively, and is configured to calculate the position difference of the boundaries of the two sides of the current collector.

[0007] In some embodiments, the position detection unit includes: an identification component for detecting boundaries and / or edges; a motion mechanism connected to the identification component to drive the identification component to move along the width direction of the current collector; and a displacement detection component configured to detect the distance moved by the identification component along the width direction to determine the position of the boundaries and / or edges in the width direction.

[0008] In some embodiments, the recognition component includes a color difference sensor that recognizes a boundary based on a color difference between the film area and the blank area and / or recognizes an edge of the current collector based on a color difference between the current collector and the transfer roller.

[0009] In some embodiments, the position detection unit further includes a motor drivingly connected to the motion mechanism to drive the identification component to move along the width direction, and the displacement detection component is configured to detect the rotation amount of the motor.

[0010] In some embodiments, the displacement detection component includes an encoder that detects the amount of rotation of the motor.

[0011] In some embodiments, the motion mechanism includes a screw rod connected to the motor and a screw sleeve matched with the screw rod, and the screw sleeve is connected to the identification component to drive the identification component to move along the width direction.

[0012] In some embodiments, the coating device also includes a measuring device carrying portion for carrying the measuring device, the measuring device carrying portion including: a bracket; two rod-shaped components, which extend along the width direction of the current collector and are arranged at intervals to form a channel between the two rod-shaped components allowing the current collector to pass through; two position detection parts are respectively installed on the two rod-shaped components.

[0013] In some embodiments, the control device is further configured to calculate the difference in width between two blank areas located at two ends of the current collector in the width direction according to the position of the edge of the current collector and the position of the boundary.

[0014] In some embodiments, the coating equipment also includes a correction device, which is configured to: adjust the relative positions of the coating component and the current collector in the width direction of the current collector based on the position difference of the boundaries of the two sides of the current collector being greater than a first predetermined value; and / or adjust the relative positions of the coating component and the current collector in the width direction of the current collector based on the difference in width of the blank areas at both ends of one side of the current collector along the width direction being greater than a second predetermined value.

[0015] In some embodiments, the coating device also includes an alarm device, which is configured to: issue an alarm message based on the position difference of the boundaries of the two sides of the collector being greater than a first predetermined value; and / or issue an alarm message based on the difference in width of the blank areas at both ends of one side of the collector along the width direction being greater than a second predetermined value.

[0016] In some embodiments, the alarm device is disposed at one end of the transmission path of the current collector close to the coating component.

[0017] According to another aspect of the present application, a battery production line is also provided, and the battery production line includes the above-mentioned coating equipment.

[0018] According to another aspect of the present application, a coating method of the above-mentioned coating equipment is also provided, including: detecting the positions of the boundaries of the film area and the blank area on both sides of the current collector in the width direction, and calculating the position difference of the boundaries on both sides of the current collector; in response to the position difference of the boundaries on both sides of the current collector being greater than a first predetermined value, issuing an alarm message or adjusting the relative position of the coating component and the current collector in the width direction of the current collector.

[0019] In some embodiments, calculating the position difference of the boundaries on both sides of the current collector includes: detecting the position of the current collector along the width direction; taking the edge of the current collector along the width direction as the zero point, determining the position of the boundary relative to the boundary; calculating the position difference of the boundaries on both sides of the current collector.

[0020] In some embodiments, the coating method also includes: calculating the difference in width of two blank areas located at both ends of the current collector along the width direction according to the position of the edge of the current collector and the position of the boundary; in response to the difference in width of the blank areas at both ends of one side of the current collector along the width direction being greater than a second predetermined value, controlling the alarm device to issue an alarm message or adjust the relative position of the coating component and the current collector in the width direction of the current collector.

[0021] By applying the technical solution of the present application, the measuring device is arranged behind the coating component and located at one end of the transmission path of the electrode close to the coating component. After the electrode coating is completed, it is timely detected whether the film area and the blank area on both sides are aligned, which is conducive to timely taking adjustment measures to ensure the quality of the electrode coating and to improve the product qualification rate.

[0022] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A schematic structural diagram of an electric device disclosed in some embodiments of the present application is shown.

[0025] Figure 2 A schematic diagram of the exploded structure of a battery pack disclosed in some embodiments of the present application is shown.

[0026] Figure 3 A schematic structural diagram of a battery cell disclosed in some embodiments of the present application is shown.

[0027] Figure 4 A three-dimensional structural schematic diagram of a coating device disclosed in some embodiments of the present application is shown.

[0028] Figure 5 A schematic diagram of the main structure of a coating device disclosed in some embodiments of the present application is shown.

[0029] Figure 6 A schematic diagram of the top view of the structure of a coating device disclosed in some embodiments of the present application is shown.

[0030] Figure 7 A side structural schematic diagram of a coating device disclosed in some embodiments of the present application is shown.

[0031] Figure 8 A schematic diagram showing the working principle of a coating device disclosed in some embodiments of the present application is shown.

[0032] Fig. 9 A control system block diagram of a coating device disclosed in some embodiments of the present application is shown.

[0033] Fig.10 A flow chart of a coating method of a coating device disclosed in some embodiments of the present application is shown.

[0034] In the figure: 1000, vehicle; 100, battery pack; 110, box; 111, first part; 112, second part; 120, battery cell; 121, end cover; 121a, electrode terminal; 122, shell; 123, battery cell assembly; 123a, pole ear; 200, controller; 300, motor; 1, transmission roller; 2, pole piece; 21, current collector; 22, membrane area; 23, blank area; 24, boundary; 25, edge; 3, coating component; 4, measuring device; 41, identification component; 42, motion mechanism; 43, displacement detection component; 44, motor; 45, signal line; 46, power line; 5, transmission roller bearing part; 6, measuring device bearing part; 61, bracket; 62, rod-shaped component; 63, connecting component; 7, control device; 8, alarm device; 9, deviation correction device. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0037] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] Further, " scope " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be including end value or not including end value, and can be combined arbitrarily, that is, any lower limit can form a scope with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for a particular parameter, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 listed, and if the maximum range value 3,4 and 5 are listed, the following scope can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "ab" represents the abbreviation of any real number combination between a and b, wherein a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0039] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0040] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0041] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0042] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0043] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0044] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0045] Figure 1 FIG. 1 shows a schematic diagram of the structure of an electric device using a battery as a power source; Figure 1As shown, the power-consuming device of this embodiment includes a vehicle 1000, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery pack 100 is disposed inside the vehicle 1000, and the battery pack 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery pack 100 may be used to power the vehicle 1000, for example, the battery pack 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0046] In some embodiments of the present application, the battery pack 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0047] Please refer to Figure 2 , Figure 2 An exploded view of a battery pack 100 provided for some embodiments of the present application. The battery pack 100 includes a case 110 and a battery module disposed in the case 110, the battery module includes a plurality of battery cells 120, and the battery cells 120 are accommodated in the case 110. Among them, the case 110 is used to provide a storage space for the battery cells 120, and the case 110 can adopt a variety of structures. In some embodiments, the case 110 may include a first portion 111 and a second portion 112, the first portion 111 and the second portion 112 cover each other, and the first portion 111 and the second portion 112 jointly define a storage space for accommodating the battery cells 120.

[0048] Each battery cell 120 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 120 may be cylindrical, flat, rectangular, or in other shapes.

[0049] Please refer to Figure 3 , Figure 3 The schematic diagram of the decomposition structure of the battery cell 120 provided in some embodiments of the present application. The battery cell 120 refers to the smallest unit constituting the battery pack 100. Figure 3 The battery cell 120 includes an end cover 121, a shell 122, a battery cell assembly 123 and other functional components.

[0050] The end cap 121 refers to a component that covers the opening of the housing 122 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cap 121 can be adapted to the shape of the housing 122 to match the housing 122. Functional components such as electrode terminals 121a can be provided on the end cap 121. The electrode terminals 121a can be used to electrically connect to the battery cell assembly 123 to output or input the electrical energy of the battery cell 120.

[0051] The housing 122 is a component used to cooperate with the end cover 121 to form an internal environment of the battery cell 120 , wherein the formed internal environment can be used to accommodate the battery cell assembly 123 , electrolyte and other components.

[0052] The cell assembly 123 is a component where electrochemical reactions occur in the battery cell 120. The housing 122 may contain one or more cell assemblies 123. The cell assembly 123 is mainly formed by winding or stacking pole sheets, wherein the pole sheets include a positive pole sheet and a negative pole sheet, and a separator is usually provided between the positive pole sheet and the negative pole sheet.

[0053] The electrode sheet mainly includes a thin sheet-shaped current collector and an active material coated on the current collector. The parts of the positive electrode sheet, cathode electrode sheet and the negative electrode sheet, anode electrode sheet with active materials constitute the main body of the battery cell assembly, and the parts of the positive electrode sheet and negative electrode sheet without active materials each constitute a tab 123a. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery pack 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 123a connects the electrode terminal to form a current loop.

[0054] The inventors have discovered that if there is a deviation in the distance between the film areas formed by the active materials coated on both sides of the current collector, it may lead to: the risk of problems in the CTS (Current Test System) test due to decarbonization at the root of the pole ear of the negative electrode during the assembly process; and the risk of problems in the CTS (Current Test System) test due to the size of the active material of the negative electrode sheet exceeding the active material of the positive electrode sheet (overhang, OH for short) in the winding process of the positive electrode material, which does not meet the requirements.

[0055] The existing method for controlling the deviation of the film regions 22 on both sides of the electrode sheet 2 is generally as follows: At the beginning of the coating process (e.g. the first finished product of the electrode 2), take a sample that has been coated on both sides. Offline measure the position of the two sides of the electrode 2 (e.g. using an image measuring instrument), and start production after reaching the corresponding target value. Offline measurement, and only in the first inspection.

[0056] During the coating process, a soft ruler (accuracy 0.5mm) is used to measure the film width, but the accuracy is insufficient and is greatly affected by the measurement method.

[0057] The tail end of the existing coating equipment is also equipped with a CCD (Charge-coupled Device) for measuring the data of the film area 22 on both sides of the pole piece, and is linked with the correction equipment for correction. This process has a lag, resulting in the pole piece exceeding the specification from the head to the CCD measurement point, and the correction process also produces pole pieces exceeding the specification. It is impossible to respond in a timely manner.

[0058] In order to improve the problem of deviation in the distance between the membrane areas formed by the active materials coated on both sides of the current collector, the present application provides a coating device, see Figures 4 to 7 The coating device includes a transport roller 1 , a coating component 3 and a measuring device 4 .

[0059] The transport roller 1 is configured to transport the current collector 21 to be coated with the active material along a predetermined path. The coating component 3 is spaced apart from the transport roller 1 in the radial direction of the transport roller 1, and is configured to coat the active material on the surface of the current collector 21 wound on the transport roller 1, so as to form a film area 22 coated with the active material and a blank area 23 not coated with the active material arranged side by side along the width direction of the current collector 21 on the surface of the current collector 21, and the width direction is perpendicular to the predetermined path.

[0060] The measuring device 4 is arranged at one end of the predetermined path close to the coating component 3 (that is, one end of the head of the coating equipment), and the measuring device 4 is adjacent to the coating component 3 in the moving direction of the current collector 21. The measuring device 4 respectively detects the positions of the boundaries 24 of the membrane area 22 and the blank area 23 on the two sides (one side is called side A, and the other side is called side B) of the current collector 21 in the width direction and / or the edges 25 of the current collector 21 in the width direction, and obtains the position difference of the boundaries 24 on the two sides of the current collector 21.

[0061] The position of the boundary 24 of the film area 22 and the blank area 23 in the width direction of the pole piece 2 determines the position and size of the film area 22 and the blank area 23. There is a difference in the position of the boundary 24 on both sides of the pole piece 2, that is, the error caused by the size and / or position of the film area 22 or the blank on both sides of the pole piece 2. Accordingly, the boundaries 24 on both sides of the pole piece 2 are aligned in the width direction, and the film area 22 and the blank area 23 on both sides of the pole piece 2 are aligned.

[0062] In this embodiment, the measuring device 4 is arranged behind the coating component 3 and is located at one end of the transmission path of the electrode 2 close to the coating component 3. After the coating of the electrode 2 is completed, it is timely detected whether the film area 22 and the blank area 23 on both sides are aligned, which is conducive to timely taking adjustment measures to ensure the quality of electrode coating. Compared with setting the measuring device at the tail end of the coating equipment, it can reduce the number of unqualified products and is conducive to improving the product qualification rate.

[0063] In some embodiments, see further Fig. 9 , the measuring device 4 includes two position detection parts, and the coating device also includes a control device 7. The two position detection parts respectively detect the positions of the boundaries 24 and / or edges 25 on both sides of the current collector 21 in the width direction. The control device 7 is signal-connected to the two position detection parts, respectively, and is configured to calculate the position difference of the boundaries 24 on both sides of the current collector 21. In some embodiments, the control device 7 includes an industrial computer.

[0064] The two position detection units simultaneously detect the positions of the boundaries 24 of the film areas 22 and the blank areas 23 on both sides of the electrode 2, and timely calculate the position difference of the boundaries 24 on both sides of the electrode, so as to timely determine whether the film areas 22 and the blank areas 23 on both sides of the electrode 2 are aligned.

[0065] In some embodiments, the position detection unit includes an identification component 41, a motion mechanism 42, and a displacement detection component 43. The identification component 41 is used to detect the boundary 24 and / or the edge 25. The motion mechanism 42 is connected to the identification component 41 to drive the identification component 41 to move along the width direction of the current collector 21. The displacement detection component 43 is configured to detect the distance moved by the identification component 41 along the width direction to determine the position of the boundary 24 and / or the edge 25 in the width direction. Among them, the displacement detection component 43 is connected to the control device 7 through a signal line 45 to feed back the position of the edge 25 or boundary 24 identified by the identification component 41 to the control device 7.

[0066] Specifically, during the movement, the identification component 41 first determines the edge 25 of one end of the current collector 21 along the width direction, and uses the edge 25 as the zero point for reference, and then continues to move to the boundary 24 of the blank area 23 and the membrane area 22. The control device 7 determines the position of the above-mentioned boundary 24 relative to the above-mentioned zero point based on the distance moved during the process of the identification component 41 identifying the above-mentioned boundary 24 and edge 25. The process of determining other boundaries 24 is similar to the above-mentioned process and will not be repeated here.

[0067] In some embodiments, the identification component 41 includes a color difference sensor. The color difference sensor is mainly composed of three parts: a light source, an optical module, and a photodetector. The color difference sensor modulates the light source with a certain frequency intensity, and irradiates the modulated light source on the surface of the object, so that the reflected and transmitted light on the surface of the object are separated, and the light is shunted and adjusted through the optical module, and finally returned to the electrical detector, and then through image processing and computer algorithms, the color and characteristic parameters of the surface of the object are analyzed to identify the boundary of color change.

[0068] In some embodiments, the position detection unit further includes a motor 44 that is transmission-connected to the motion mechanism 42 to drive the identification component 41 to move in the width direction, and the displacement detection component 43 is configured to detect the rotation amount of the motor 44. In this embodiment, the displacement detection component 43 monitors the position of the identification component 41 by monitoring the rotation amount of the motor 44, so that the control device 7 can calculate the position of the above-mentioned boundary 24 and edge 25. The motor 44 is connected to the power supply through the power line 46.

[0069] In some embodiments, the displacement detection component 43 includes an encoder for detecting the rotation amount of the motor 44. The encoder converts the angular displacement of the motor into an electrical signal and transmits it to the control device 7. The control device 7 determines the position of the identification component 41 according to the displacement (rotation amount) of the motor, and then determines the position of the above-mentioned boundary 24 and / or edge 25, and then determines whether the film area 22 and the blank area 23 on both sides of the pole piece 2 are aligned, which is conducive to timely taking adjustment measures to ensure the coating quality of the pole piece and is conducive to improving the qualified rate of the product.

[0070] In some embodiments, the motion mechanism 42 includes a screw connected to the motor 44 and a screw sleeve matched with the screw, and the screw sleeve is connected to the identification component 41 to drive the identification component 41 to move along the width direction. The use of a mature screw (also called a lead screw or a lead screw) to drive the identification component 41 to move along the width direction of the pole piece 2 is conducive to reducing costs. In addition, the screw transmission mechanism has the advantages of high precision and low friction, which is conducive to improving the accurate detection of the position and size of the membrane area 22 and the blank area 23 to ensure the quality of the product.

[0071] In some embodiments, a measuring device carrying part 6 for carrying the measuring device 4 is further included, and the measuring device carrying part 6 includes a bracket 61 and two rod-shaped parts 62. The two rod-shaped parts 62 extend along the width direction of the current collector 21 and are arranged at intervals to form a channel between the two rod-shaped parts 62 for allowing the current collector 21 to pass through; and the two position detection parts are respectively installed on the two rod-shaped parts 62.

[0072] A passage is formed between two parallel and spaced rod-shaped parts 62 for allowing the pole piece 2 to pass through, and two measuring devices are respectively mounted on the two rod-shaped parts 62 and are both located on the side of the passage of the corresponding rod-shaped parts 62 away from the pole piece 2, and the two rod-shaped parts 62 are connected to the bracket 61 through the connecting part 63. The structure of the measuring device bearing part 6 of this embodiment is compact and tight, which can prevent the original function of the original coating equipment from being affected.

[0073] In some embodiments, both ends of the rod-shaped component 62 are connected to two brackets 61 through connecting components 63. Both ends of the transmission roller 1 are respectively mounted on two transmission roller bearing parts 5, and the brackets 61 at both ends of the rod-shaped component 62 are respectively connected to the two transmission roller bearing parts 5.

[0074] In some embodiments, the control device 7 is also configured to calculate the difference in width of two blank areas 23 located at both ends of the current collector 21 along the width direction according to the position of the edge 25 of the current collector 21 and the position of the boundary 24, which is beneficial to ensuring the quality of the battery cell and effectively reducing the risk of problems in the CTS (Current Test System) test caused by decarbonization at the root of the pole ear of the negative electrode during the assembly process; the risk of problems in the CTS (Current Test System) test caused by the size of the active material of the negative electrode sheet exceeding the active material of the positive electrode sheet (overhang, OH for short) in the winding process of the positive electrode material not meeting the requirements.

[0075] The coating equipment also includes a correction device 9, which is configured to: adjust the relative positions of the coating component 3 and the current collector 21 in the width direction of the current collector 21 based on the position difference of the boundaries 24 on both sides of the current collector 21 being greater than a first predetermined value; and / or adjust the relative positions of the coating component 3 and the current collector 21 in the width direction of the current collector 21 based on the difference in width of the blank areas 23 at both ends of one side of the current collector 21 along the width direction being greater than a second predetermined value.

[0076] The correcting device 9 adjusts the coating component 3 and the current collector 21, including adjusting the position of the coating component 3 along the width direction of the current collector 21 and / or adjusting the position of the current collector 21 along the width direction of the current collector. After the measuring device 4 detects that the position difference of the boundaries 24 on both sides of the current collector 21 is greater than a first predetermined value or the difference in width of the blank areas 23 at both ends of one side of the current collector 21 along the width direction is greater than a second predetermined value, the coating equipment promptly performs correction to reduce the number of unqualified products produced.

[0077] In other embodiments, the coating equipment also includes a correction device 9, and the control device 7 is connected to the correction device 9 by signal. The control device 7 is configured to: in response to the position difference of the boundaries 24 on both sides of the current collector 21 being greater than a first predetermined value, control the alarm device 8 to control the correction device 9 to adjust the relative position of the coating component 3 and the current collector 21 in the width direction of the current collector 21; and / or, in response to the difference in the width of the blank areas 23 at both ends of one side of the current collector 21 along the width direction being greater than a second predetermined value, control the correction device 9 to adjust the relative position of the coating component 3 and the current collector 21 in the width direction of the current collector 21.

[0078] In some embodiments, the coating equipment also includes an alarm device 8, which is configured to: issue an alarm message based on the position difference between the boundaries 24 on both sides of the current collector 21 being greater than a first predetermined value; and / or issue an alarm message based on the difference in width of the blank areas 23 at both ends of one side of the current collector 21 along the width direction being greater than a second predetermined value.

[0079] In some embodiments, the alarm device 8 is disposed at one end of the transmission path of the current collector 21 close to the coating component 3. In this embodiment, the alarm information is fed back to one end of the head of the coating device, which is conducive to timely detection of coating abnormalities and timely adjustment of the equipment to reduce the number of unqualified products.

[0080] When quality problems occur in the electrode after coating, timely alarm information is issued, which is conducive to timely taking adjustment measures to ensure the quality of electrode coating and to improve the qualified rate of products.

[0081] In other embodiments, the coating equipment also includes an alarm device 8, and the control device 7 is connected to the alarm device 8 signal and is configured to: in response to the position difference of the boundaries 24 on both sides of the current collector 21 being greater than a first predetermined value, control the alarm device 8 to issue an alarm message; and / or, in response to the difference in width of the blank areas 23 at both ends of one side of the current collector 21 along the width direction being greater than a second predetermined value, control the alarm device 8 to issue an alarm message.

[0082] See also Figure 4 and 8 The pole piece 2 of this embodiment includes two film areas 22 arranged side by side and spaced apart in the width direction, a blank area 23 is provided between the two film areas 22, and a blank area 23 is provided at the outer ends of the two film areas 22. The two film areas are respectively the first film area and the second film area arranged in sequence along the original zero point, and the blank areas are respectively the first blank area, the second blank area and the third blank area arranged in sequence away from the zero point.

[0083] Among them, the widths of the first film area and the second film area on one side of the electrode 2 are a1 and a2 respectively, and the first blank area, the second blank area and the third blank area are A1, A2 and A3 respectively; the widths of the first film area and the second film area on the other side are b1 and b2 respectively, and the first blank area, the second blank area and the third blank area are B1, B2 and B3 respectively.

[0084] After the motor rotates, it drives the identification component 41 to move along the above-mentioned width direction, and takes one end of the width direction of the pole piece 2 as the zero point. The identification component 41 detects the color difference between the "blank area" and the "film area" for measurement: A1-B1 obtains the misalignment distance (≤0.25mm); A1-A3 obtains the misalignment distance (<0.15mm), A2-B2 obtains the misalignment data, and is linked to the machine head for display reminders, and the machine head data is recorded, and the feedback correction system is used for automatic correction.

[0085] The coating equipment of this embodiment achieves the following technical effects.

[0086] 1. High misalignment measurement accuracy: the measurement accuracy of the soft tape is increased from 0.5mm to 0.1mm, and the AB surface can be measured simultaneously.

[0087] 2. Shorten the AB surface misalignment debugging time: 10min / time.

[0088] 3. Reduce material waste caused by adjusting coating equipment: >200m / time.

[0089] According to another aspect of the present invention, a battery production line is provided, and the battery production line includes the above-mentioned coating device.

[0090] According to another aspect of the present invention, a coating method for the above-mentioned coating equipment is also provided, the coating method comprising: detecting the positions of the boundaries 24 of the film area 22 and the blank area 23 on both sides of the current collector 21 in the width direction, and calculating the position difference of the boundaries 24 on both sides of the current collector 21; in response to the position difference of the boundaries 24 on both sides of the current collector 21 being greater than a first predetermined value, issuing an alarm message.

[0091] After the electrode 2 is coated, the film area 22 and the blank area 23 on both sides are promptly checked for alignment. If misalignment occurs, it is beneficial to take adjustment measures in time to ensure the coating quality of the electrode and improve the qualified rate of the product.

[0092] In some embodiments, calculating the position difference of the boundary 24 on both sides of the current collector 21 includes: detecting the position of the current collector 21 along the width direction; taking the edge of the current collector 21 along the width direction as the zero point, determining the position of the boundary 24 relative to the zero point; calculating the position difference of the boundary 24 on both sides of the current collector 21.

[0093] During the movement, the identification component 41 first determines the edge 25 of one end of the current collector 21 along the width direction, and uses the edge 25 as the zero point for reference, and then continues to move to the boundary 24 of the blank area 23 and the membrane area 22. The control device 7 determines the position of the above-mentioned boundary 24 relative to the above-mentioned zero point based on the distance moved in the process of the identification component 41 identifying the above-mentioned boundary 24 and edge 25. The process of determining other boundaries 24 is similar to the above-mentioned process and will not be repeated here.

[0094] In some embodiments, the coating method also includes: calculating the difference in width of two blank areas 23 located at both ends of the current collector 21 along the width direction according to the position of the edge 25 of the current collector 21 and the position of the boundary 24; in response to the difference in width of the blank areas 23 at both ends of the width direction of one side of the current collector 21 being greater than a second predetermined value, controlling the alarm device 8 to issue an alarm message.

[0095] It is beneficial to ensure the quality of battery cells and effectively reduce the risk of problems in CTS (Current Test System) testing due to decarbonization at the root of the pole ear during the assembly process of the negative electrode plate; and the risk of problems in CTS (Current Test System) testing due to the size of the active material of the negative electrode plate exceeding the active material of the positive electrode plate (overhang, OH for short) not meeting the requirements during the winding process of the positive electrode material.

[0096] See the application Figure 4 and Fig.10 , the coating method of the coating equipment of the present application is as follows.

[0097] In step S1 , the identification components 41 respectively located on both sides of the electrode sheet 2 move along the width direction of the current collector 21 to identify the edge 25 of one end of the current collector 21 along its width direction and the boundary 24 between the membrane area 22 and the blank area 23 .

[0098] In step S2, the control device 7 takes one end of the current collector 21 in the width direction as the zero point, and respectively calculates the positions of the boundaries 24 of the film area 22 and the blank area 23 on both sides of the current collector 21 relative to the zero point. In some embodiments, the identification components 41 located on both sides of the electrode 2 are respectively moved from the same end of the current collector 21 along the width direction toward the other end, and the movement start end of the current collector 21 located at the identification component 41 is taken as the zero point, and then the boundaries 24 of multiple film areas 22 and blank areas 23 are identified one by one.

[0099] Step S3 , respectively calculating the position difference between the boundary 24 of the film area 22 and the blank area 23 on both sides of the current collector 21 and the width difference of the blank area 23 at both ends of the current collector 21 in the width direction.

[0100] Step S4 , the control device 7 controls the alarm device 8 to issue an alarm message in response to the position difference of the boundary 24 being greater than a first predetermined value and the width difference being greater than a second predetermined value.

[0101] Finally, after receiving the alarm information, the operator corrects the coating equipment. The coating equipment and coating method of this embodiment are conducive to ensuring the coating quality and accuracy of the electrode and reducing the scrap rate.

[0102] The above are merely exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A coating device, characterized in that: include: A transport roller (1) configured to transport a current collector (21) to be coated with an active material along a predetermined path; a coating component (3) arranged at intervals from the transport roller (1) in the radial direction of the transport roller (1), and configured to coat the surface of the current collector (21) wound around the transport roller (1) with an active material, so as to form a film area (22) coated with the active material and a blank area (23) not coated with the active material arranged side by side along the width direction of the current collector (21) on the surface of the current collector (21), wherein the width direction is perpendicular to the predetermined path; as well as A measuring device (4) is arranged at one end of the predetermined path close to the coating component (3), and the measuring device (4) includes two position detection parts, and the two position detection parts are configured to respectively detect the boundaries (24) of the film area (22) and the blank area (23) on the two sides of the current collector (21) in the width direction and / or respectively detect the positions of the edges (25) of the current collector (21) in the width direction, so as to obtain the position difference of the boundaries (24) on the two sides of the current collector (21).

2. The coating device according to claim 1, characterized in that: It also includes a control device (7), which is connected to the two position detection parts via signals and is configured to calculate the position difference of the boundaries (24) on the two sides of the current collector (21).

3. The coating device according to claim 1, characterized in that: The position detection unit comprises: An identification component (41) for detecting the boundary (24) and / or the edge (25); a moving mechanism (42) connected to the identification component (41) to drive the identification component (41) to move along the width direction of the current collector (21); and The displacement detection component (43) is configured to detect the distance that the identification component (41) moves along the width direction, so as to determine the position of the boundary (24) and / or the edge (25) in the width direction.

4. The coating device according to claim 3, characterized in that: The identification component (41) comprises a color difference sensor, which identifies the boundary (24) based on the color difference between the film area (22) and the blank area (23) and / or identifies the edge of the current collector (21) based on the color difference between the current collector (21) and the transport roller (1).

5. The coating device according to claim 3, characterized in that: The position detection unit further comprises a motor (44) which is transmission-connected to the motion mechanism (42) to drive the identification component (41) to move along the width direction, and the displacement detection component (43) is configured to detect the rotation amount of the motor (44).

6. The coating device according to claim 5, characterized in that: The displacement detection component (43) includes an encoder for detecting the rotation amount of the motor (44).

7. The coating device according to claim 5, characterized in that: The motion mechanism (42) comprises a screw rod that is transmission-connected to the motor (44) and a screw sleeve that cooperates with the screw rod, and the screw sleeve is connected to the identification component (41) to drive the identification component (41) to move along the width direction.

8. The coating device according to claim 1, characterized in that: It also includes a measuring device carrying portion (6) for carrying the measuring device (4), the measuring device carrying portion (6) comprising: Bracket (61); Two rod-shaped components (62) extend respectively along the width direction of the current collector (21) and are arranged at intervals, so as to form a channel between the two rod-shaped components (62) that allows the current collector (21) to pass through; and the two position detection parts are respectively mounted on the two rod-shaped components (62).

9. The coating device according to claim 2, characterized in that: The control device (7) is also configured to calculate the difference in width between the two blank areas (23) located at the two ends of the current collector (21) along the width direction according to the position of the edge (25) of the current collector (21) and the position of the boundary (24).

10. The coating device according to claim 1, characterized in that: It also includes a deviation correction device (9), which is configured to: Based on the position difference of the boundaries (24) on both sides of the current collector (21) being greater than a first predetermined value, adjusting the relative position of the coating component (3) and the current collector (21) in the width direction of the current collector (21); and / or Based on the difference in width of the blank area (23) at both ends of one side of the current collector (21) along the width direction being greater than a second predetermined value, the relative positions of the coating component (3) and the current collector (21) in the width direction of the current collector (21) are adjusted.

11. The coating device according to claim 1, characterized in that: It also includes an alarm device (8), which is configured to: Based on the position difference of the boundaries (24) on the two sides of the current collector (21) being greater than a first predetermined value, issuing an alarm message; and / or Based on the fact that the difference in width of the blank area (23) at both ends of one side of the current collector (21) along the width direction is greater than a second predetermined value, an alarm message is issued.

12. The coating device according to claim 11, characterized in that The alarm device (8) is arranged at one end of the transmission path of the current collector (21) close to the coating component (3).

13. A battery production line, characterized in that: A coating device comprising any one of claims 1 to 12.

14. A coating method of the coating device according to any one of claims 1 to 12, characterized in that: include: Detecting the positions of the boundaries (24) between the film area (22) and the blank area (23) on both sides of the current collector (21) in the width direction, and calculating the position difference of the boundaries (24) on both sides of the current collector (21); In response to the position difference of the boundaries (24) on both sides of the current collector (21) being greater than a first predetermined value, an alarm message is issued or the relative position of the coating component (3) and the current collector (21) in the width direction of the current collector (21) is adjusted.

15. The coating method according to claim 14, characterized in that: Calculating the position difference of the boundaries (24) on both sides of the current collector (21) comprises: Obtaining the position of the current collector (21) along the width direction; Taking the edge (25) of the current collector (21) along the width direction as a zero point, calculating the position of the boundary (24) relative to the zero point; The position difference of the boundary (24) on both sides of the current collector (21) is calculated.

16. The coating method according to claim 14, characterized in that: Also includes: Calculating the difference in width between two blank areas (23) located at two ends of the current collector (21) along the width direction according to the position of the edge (25) of the current collector (21) and the position of the boundary (24); In response to the difference in width of the blank area (23) at both ends of one side of the current collector (21) along the width direction being greater than a second predetermined value, the alarm device (8) is controlled to issue an alarm message or adjust the relative position of the coating component (3) and the current collector (21) in the width direction of the current collector (21).

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