Fluorescent coating apparatus and method, battery winding inspection method and apparatus

Abstract

The application provides a fluorescent coating device, a fluorescent coating method, a battery winding detection method, a battery winding device and a battery monomer. The fluorescent coating device comprises a unwinding mechanism, a transmission roller and a coating unit. The unwinding mechanism is used for unwinding a battery pole piece. The transmission roller is configured to transmit the battery pole piece. The coating unit is configured to coat a fluorescent agent to the edge of an active material area of the battery pole piece.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a fluorescent coating device, a fluorescent coating method, a battery winding detection method, a battery winding device, and a battery cell. Background Technology

[0002] In the battery manufacturing industry, battery winding equipment winds the anode, cathode, first separator, and second separator together to form a battery cell. This cell is then processed through a series of steps, including hot pressing, welding tabs, and electrolyte injection, to produce the finished battery. Cell winding is the core process in battery manufacturing, directly determining battery performance. During the winding process, the condition of each membrane roll in the electrode assembly needs to be inspected to ensure that the battery quality meets production standards.

[0003] With the continuous development and improvement of battery technology, problems such as uneven lighting and unclear imaging may occur when using visible light to illuminate battery electrodes and taking pictures with a camera for detection. This leads to distortion in the image detection results of battery electrodes, making it difficult to meet current detection requirements. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide a fluorescent coating apparatus, a fluorescent coating method, a battery winding detection method, a battery winding apparatus, and a battery cell, to improve the accuracy of battery electrode detection.

[0005] An embodiment of the first aspect of this application provides a fluorescent coating apparatus, which includes an unwinding mechanism, a transfer roller, and a coating unit. The unwinding mechanism is used to unwind a battery electrode sheet, the transfer roller is configured to transfer the battery electrode sheet, a driving mechanism is configured to drive the transfer roller to rotate, and the coating unit is configured to coat a fluorescent agent onto the edge of the active material region of the battery electrode sheet.

[0006] In the technical solution of this application embodiment, the battery electrode sheet is unwound by an unwinding mechanism and transported by a transfer roller. During the winding process of the battery electrode sheet, the coating unit applies fluorescent agent to the edge of the active material area of ​​the battery electrode sheet, making the edge features of the active material area of ​​the battery electrode sheet easier to identify in the detection image, thereby improving the accuracy of image detection. Moreover, by directly applying the fluorescent material to the target detection area—the edge of the active material area—it can save fluorescent material and make the detection object more targeted.

[0007] In some embodiments, the coating unit includes an extrusion head configured to abut against the edge of the active material region of the battery electrode. By abutting the edge of the active material region of the battery electrode with the extrusion head, the fluorescent agent can be accurately applied to the edge of the active material region of the battery electrode, thereby facilitating the recognition of detection images.

[0008] In some embodiments, the coating unit further includes a pressure sensor for detecting the contact pressure between the extrusion head and the edge of the active material region of the battery electrode. By detecting the contact pressure between the extrusion head and the edge of the active material region of the battery electrode using the pressure sensor included in the coating unit, the contact pressure between the extrusion head and the edge of the active material region of the battery electrode can be monitored in real time. This allows for real-time understanding of the edge contact status between the extrusion head and the active material region of the battery electrode. Detecting the contact pressure can help determine the coating quality of the fluorescent agent and improve the coating effect.

[0009] In some embodiments, the extrusion head and the transfer roller are respectively disposed on opposite sides of the battery electrode. By disposing the extrusion head and the transfer roller on opposite sides of the battery electrode, the extrusion head can better apply the fluorescent agent to the edge of the active material area of ​​the battery electrode, thereby giving the fluorescent coating device a better coating effect.

[0010] In some embodiments, the fluorescent coating apparatus further includes a first adjustment unit configured to drive the extrusion head closer to or further away from the active material region, such that the contact pressure between the extrusion head and the edge of the active material region of the battery electrode is maintained within a preset pressure range. By driving the extrusion head closer to or further away from the active material region through the first adjustment unit, the contact pressure between the extrusion head and the edge of the active material region of the battery electrode is maintained within the preset pressure range, allowing the extrusion head to adapt to changes in the thickness of the active material region of the electrode, thus ensuring the coating effect of the fluorescent agent.

[0011] In some embodiments, the fluorescent coating apparatus further includes a second adjustment unit configured to drive the coating unit to move along the width direction of the battery electrode. By driving the coating unit to move along the width direction of the battery electrode, the edge of the active material region of the battery electrode remains at least partially in contact with the coating unit, thereby ensuring that the coating unit can still apply the fluorescent agent to the target location even if the battery electrode shifts.

[0012] In some embodiments, the battery electrode includes a first side and a second side facing each other; the coating unit includes a first coating unit and a second coating unit, wherein the first coating unit includes a first extrusion head and a second extrusion head arranged axially spaced along the transfer roller, the first extrusion head and the second extrusion head respectively contacting the edge of the active material region on the first side; the second coating unit includes a third extrusion head and a fourth extrusion head arranged axially spaced along the transfer roller, the third extrusion head and the fourth extrusion head respectively contacting the edge of the active material region on the second side. By having the first extrusion head and the second extrusion head arranged axially spaced along the transfer roller in the first coating unit contact the edge of the active material region on the first side; and the third extrusion head and the fourth extrusion head arranged axially spaced along the transfer roller in the second coating unit respectively contact the edge of the active material region on the second side, fluorescent material can be coated on the active material regions on both opposite sides of the battery electrode simultaneously, improving the coating efficiency.

[0013] An embodiment of the second aspect of this application provides a fluorescent coating method for a battery electrode, including positioning a coating unit at the edge of the active material region of the battery electrode; and controlling the coating unit to coat a fluorescent agent to the edge of the active material region of the battery electrode in a transport state.

[0014] In this embodiment, by positioning the coating unit at the edge of the active material region of the battery electrode, the coating unit is controlled to apply the fluorescent agent to the edge of the active material region of the battery electrode in the transport state. This makes the edge features of the active material region of the battery electrode easier to identify in the detection image, thereby improving the accuracy of image detection. Moreover, by directly applying the fluorescent agent to the target detection area—the edge of the active material region—fluorescent material can be saved, making the detection target more targeted.

[0015] In some embodiments, the coating unit is moved to a position corresponding to the edge of the active material region of the battery electrode; the coating unit is moved to make contact with the edge of the active material region of the battery electrode, and the contact pressure between the two is adjusted to a preset pressure range. By moving the coating unit to a position corresponding to the edge of the active material region of the battery electrode; moving the coating unit to make contact with the edge of the active material region of the battery electrode, and adjusting the contact pressure between the two to a preset pressure range, the coating unit can more accurately apply the fluorescent agent to the edge of the active material region of the battery electrode 400.

[0016] In some embodiments, the contact pressure between the coating unit and the battery electrode is acquired; in response to the contact pressure exceeding a preset pressure range, a coating abnormality signal is output. Acquiring the contact pressure between the coating unit and the battery electrode using a pressure sensor, and outputting a coating abnormality signal in response to the contact pressure exceeding a preset pressure range, allows relevant personnel to promptly understand the coating status and take timely and proactive response measures when abnormalities occur.

[0017] In some embodiments, after outputting a coating abnormality signal in response to a contact pressure exceeding a preset pressure range, the method further includes: adjusting the contact pressure between the coating unit and the battery electrode to a preset pressure range based on the coating abnormality signal. Adjusting the contact pressure between the coating unit and the battery electrode to a preset pressure range based on the coating abnormality signal makes the contact pressure between the coating unit and the battery electrode more consistent with the coating pressure requirements.

[0018] In some embodiments, controlling the coating unit to apply fluorescent agent to the edge of the active material region of the battery electrode in the transport state further includes: acquiring offset information of the edge of the active material region of the battery electrode relative to the coating unit; and, based on the offset information, controlling the battery electrode and / or the coating unit to move so that the edge of the active material region of the battery electrode at least partially contacts the coating unit. By acquiring the offset information of the edge of the active material region of the battery electrode relative to the coating unit, and controlling the movement of the battery electrode and / or the coating unit based on the offset information, the coating unit can still apply fluorescent agent to the target position even when the battery electrode is offset.

[0019] In some embodiments, obtaining the offset information of the edge of the active material region of the battery electrode relative to the coating unit includes: obtaining the width information of the fluorescent region of the edge of the active material region of the battery electrode; and determining the offset information of the edge of the active material region of the battery electrode relative to the coating unit based on the width information of the fluorescent region. By obtaining the width information of the fluorescent region of the edge of the active material region of the battery electrode and determining the offset information of the edge of the active material region of the battery electrode relative to the coating unit based on the width information of the fluorescent region, the determined offset information can be more accurate.

[0020] In some embodiments, controlling the movement of the battery electrode and / or coating unit based on offset information to at least partially contact the edge of the active material region of the battery electrode with the coating unit includes: the offset information including an offset distance; controlling the movement of the coating unit to at least partially contact the edge of the active material region of the battery electrode with the coating unit in response to an offset distance greater than a first preset distance and less than a second preset distance; and controlling the movement of the battery electrode to at least partially contact the edge of the active material region of the battery electrode with the coating unit in response to an offset distance greater than or equal to the second preset distance. Controlling the movement of the coating unit or the battery electrode by using an offset distance to at least partially contact the edge of the active material region of the battery electrode with the coating unit simplifies the control process.

[0021] In some embodiments, the width information of the fluorescent region at the edge of the active material region of the battery electrode is obtained; based on the width information of the fluorescent layer, the movement of the battery electrode and / or coating unit is controlled so that the edge of the active material region of the battery electrode at least partially contacts the coating unit. By detecting the width information of the fluorescent region, the movement of the battery electrode and / or coating unit can be controlled so that the edge of the active material region of the battery electrode at least partially contacts the coating unit, making the control process simpler.

[0022] In some embodiments, the edge of the active material region of the battery electrode is at least partially in contact with the coating unit so that the width of the fluorescent region formed at the edge of the active material region of the battery electrode is greater than or equal to a preset threshold. By having the edge of the active material region of the battery electrode at least partially in contact with the coating unit so that the width of the fluorescent region formed at the edge of the active material region of the battery electrode is greater than or equal to the preset threshold, the fluorescent region can be better detected.

[0023] An embodiment of the third aspect of this application provides a battery winding detection method, including applying a fluorescent agent to the edge of the active material region of the battery electrode; acquiring a fluorescence detection image of the edge of the active material region of the battery electrode; and determining the winding state of the battery based on the fluorescence detection image. By using the fluorescence detection image of the edge of the active material region of the battery electrode, it is possible to determine whether there are any abnormalities in the battery winding state, which is beneficial for real-time monitoring of the working status of the winding process and improving production efficiency.

[0024] In some embodiments, the battery electrode includes a first electrode and a second electrode, and the fluorescence detection image includes the first electrode at least partially wound on the winding needle and the second electrode not yet wound on the winding needle. The fluorescence detection image includes the first electrode at least wound on the winding needle and the second electrode not yet wound on the winding needle, allowing the state of both electrodes to be captured at one location, thereby simplifying the process of determining whether there is an abnormality in the battery winding state.

[0025] In some embodiments, determining the winding state of the battery based on a fluorescence detection image includes: determining the positional relationship between the edge of the first electrode and the edge of the second electrode based on the fluorescence detection image; and determining the winding state of the battery based on the positional relationship between the edges of the first electrode and the second electrode. Determining the positional relationship between the edges of the first electrode and the second electrode based on the fluorescence detection image, and determining the winding state of the battery based on the positional relationship between the edges of the first electrode and the second electrode, can improve the accuracy of determining the winding state of the battery.

[0026] An embodiment of the fourth aspect of this application provides a battery winding apparatus, including a fluorescent coating device, a detection light source, an image acquisition device, and a processing unit. The fluorescent coating device is configured to coat a fluorescent agent onto the edge of the active material region of the battery electrode. The detection light source is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode. The image acquisition device is configured to acquire a fluorescent detection image of the edge of the active material region of the battery electrode. The processing unit identifies the fluorescent detection image and determines the winding state of the battery. By using the fluorescent detection image of the edge of the active material region of the battery electrode, it is possible to determine whether there is an abnormality in the battery winding state, which is beneficial for real-time monitoring of the working status of the winding process and improving production efficiency.

[0027] In some embodiments, the battery winding apparatus further includes a winding assembly, which includes a winding needle and a conveying assembly. The conveying assembly is configured to wind the battery electrode sheet onto the surface of the winding needle. The detection light source includes a first light source group and a second light source group. The first light source group is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode sheet located at a first end of the winding needle. The second light source group is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode sheet located at a second end of the winding needle. The first end and the second end are respectively located at both ends of the winding needle along the width direction of the electrode assembly. By using the first light source group and the second light source group, fluorescent laser light sources projected onto the edges of the active material regions of the battery electrode sheets located at both ends of the winding needle along the width direction of the electrode assembly can be provided simultaneously, enabling comprehensive detection of the battery winding state and improving the accuracy of the detection results.

[0028] In some embodiments, the battery electrode includes a first electrode and a second electrode, and the image acquisition device includes a first imaging unit and a second imaging unit. The first imaging unit is configured to acquire a first fluorescence detection image, which includes a first electrode at least partially wound around a first end of a winding needle and a second electrode not yet wound around the first end of the winding needle. The second imaging unit is configured to acquire a second fluorescence detection image, which includes a first electrode at least partially wound around a second end of the winding needle and a second electrode not yet wound around the second end of the winding needle. Through the first imaging unit and the second imaging unit, first fluorescence detection images and second fluorescence detection images are respectively acquired at both ends of the winding needle along the width direction of the electrode assembly, representing the first electrode wound around the winding needle and the second electrode not yet wound around the winding needle. Since there is no crosstalk between the first imaging unit and the second imaging unit, the detection results can be mutually verified, improving the efficiency and accuracy of the detection.

[0029] An embodiment of the fifth aspect of this application provides a battery cell, including: an electrode assembly, the electrode assembly including a battery electrode sheet, wherein the edge of the active material region of the battery electrode sheet has a fluorescent material.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0032] Figure 1 A schematic diagram of the structure of a fluorescent coating device provided in some embodiments of this application;

[0033] Figure 2 A schematic diagram of a battery electrode cross-section is provided for some embodiments of this application;

[0034] Figure 3 Schematic diagram of an extrusion head provided for some embodiments of this application;

[0035] Figure 4 A schematic diagram of another fluorescent coating apparatus provided in some embodiments of this application;

[0036] Figure 5 A schematic diagram of a fluorescent coating device provided for other embodiments of this application;

[0037] Figure 6 A flowchart illustrating a fluorescent coating method for battery electrodes provided for some embodiments of this application;

[0038] Figure 7 A flowchart illustrating another method for fluorescent coating of battery electrodes provided in some embodiments of this application;

[0039] Figure 8 A flowchart illustrating a fluorescent coating method for a battery electrode provided for other embodiments of this application;

[0040] Figure 9 A flowchart of a battery winding detection method provided in some embodiments of this application;

[0041] Figure 10 A schematic diagram of a battery winding device provided for some embodiments of this application;

[0042] Figure 11 A schematic diagram of a battery winding device provided for other embodiments of this application;

[0043] Figure 12 A flowchart illustrating another method for fluorescent coating of a battery electrode provided for other embodiments of this application;

[0044] Figure 13 This is a schematic diagram of another battery winding device provided for some embodiments of this application.

[0045] Explanation of reference numerals in the attached figures:

[0046] 10, 1001, Fluorescent Coating Device;

[0047] 100. Transfer roller; 200. Unwinding mechanism; 300. Coating unit; 400. Battery electrode sheet;

[0048] 310. First coating unit; 320. Second coating unit; 301. Extrusion head; 302. Pressure sensor; 303. First adjustment unit; 304. Second adjustment unit; 410. Anode plate; 420. Cathode plate;

[0049] 3031, First drive unit; 3032, First transmission unit; 3041, Second drive unit; 3042, Second transmission unit; 311, First extrusion head; 312, Second extrusion head; 321, Third extrusion head; 322, Fourth extrusion head;

[0050] 411. Anode active material; 412. Anode metal foil; 4111. Anode active material area; 4112. Side of anode electrode; 421. Cathode active material; 422. Cathode metal foil; 4211. Cathode active material area; 4213. Ceramic coating area; 4212. Side of cathode electrode; 431. Anode fluorescent area; 432. Cathode fluorescent area;

[0051] 1000, Battery winding device; 1002, Detection light source; 1003, Image acquisition device; 1004, Processing unit; 1005, Winding assembly; 10051, Winding needle; 10052, Conveying assembly; 10021, First light source group; 10022, Second light source group; 10031, First imaging unit; 10032, Second imaging unit. Detailed Implementation

[0052] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0055] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0057] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0058] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0059] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0060] Currently, battery manufacturing involves a winding process, which winds the anode, cathode, and separator components into a complete semi-cell. During winding, the alignment of the anode, cathode, and separator must be within a preset range, such as ±0.5 mm. Exceeding this range poses a risk of short circuits, which could even cause fires and explosions during use. Therefore, reliable detection methods are needed to monitor the winding process in real time and prevent oversized cells from entering subsequent processes.

[0061] In related technologies, battery electrode alignment monitoring systems heavily rely on image clarity and edge detection algorithms. Changes in light source brightness, irregular material edges, or camera tilt can cause the visual monitoring system to malfunction, leading to false alignment detections. Furthermore, typical electrode alignment cameras require layer-by-layer calibration of the areas detecting electrode edges to verify the camera's accuracy. This stage necessitates system shutdown for calibration, impacting cell production efficiency.

[0062] Therefore, this application proposes a fluorescent coating device, which enhances the target or feature to be tested by coating a fluorescent agent onto the edge of the active material area of ​​the battery electrode, thereby making the detection object more targeted.

[0063] The fluorescent coating device disclosed in this application can be applied to, but is not limited to, winding machine systems and the winding process in battery manufacturing. The coating unit of this fluorescent coating device applies fluorescent agent to the edge of the active material area of ​​the battery electrode. The fluorescence emitted by the fluorescent agent under the excitation of a specific wavelength light source can enhance the edge features of the active material area in the detection image, thereby enabling simpler and more accurate detection of the battery electrode position. At the same time, the fluorescent agent is directly applied to the edge of the active material area of ​​the battery electrode, which can greatly reduce the amount of fluorescent agent used and make the detection target more targeted.

[0064] Figure 1 This is a schematic diagram of the structure of a fluorescent coating device 10 provided in some embodiments of this application. For example... Figure 1 As shown, the fluorescent coating apparatus 10 includes an unwinding mechanism 200, a transfer roller 100, and a coating unit 300. The unwinding mechanism 200 is used to unwind the battery electrode 400, and the transfer roller 100 is configured to transfer the battery electrode 400. The coating unit 300 is configured to coat the fluorescent agent onto the edge of the active material region of the battery electrode 400.

[0065] In the embodiments of this application, the battery electrode 400 is an important part of the electrode assembly in the battery cell. Figure 2 This application provides a schematic diagram of a cross-section of a battery electrode 400, as shown in some embodiments. Figure 2As shown, the battery electrode 400 includes an anode electrode 410 and a cathode electrode 420. The anode electrode 410 and cathode electrode 420 are arranged by winding or stacking to form an electrode assembly, and a first separator and a second separator are typically provided between the anode electrode 410 and the cathode electrode 420. The portions of the anode electrode 410 and the cathode electrode 420 containing active material constitute the main body of the electrode assembly, while the portions of the anode electrode 410 and the cathode electrode 420 without active material each constitute a tab. During the charging and discharging process of the battery, the anode active material and the cathode active material react with the electrolyte, and the tabs connect to the electrode terminals to form a current circuit. When the battery electrode 400 is wound to form the electrode assembly, the anode electrode 410, the first separator, the cathode electrode 420, and the second separator are stacked sequentially and wound onto the surface of a winding needle by a winding mechanism. During winding, the battery electrode 400 must ensure that the anode electrode 410 and cathode electrode 420 are spaced apart and completely covered between the first and second separators to prevent them from contacting each other or being exposed outside the first and second separators. Because the anode electrode 410, the first separator, the cathode electrode 420, and the second separator are all prone to swaying during transport, they deviate from their normal transport positions, resulting in extremely poor edge alignment of the wound battery cell and severely affecting the quality of the wound battery cell.

[0066] To detect the alignment of the battery electrode 400, fluorescent material can be added to the active material region of the battery electrode 400. Irradiated with a specific light source, the reflected fluorescence of a specific wavelength is captured by a camera through a polarizer, and the alignment of the battery electrode 400 is detected by identifying the image of the active material region containing the fluorescent material. In one example, the fluorescent material can be mixed into the electrode slurry during the manufacturing process of the battery electrode 400, and then the slurry containing the fluorescent material can be coated onto the current collector foil to form the active material region. However, this requires a large amount of fluorescent material, and it is difficult to ensure that the edges of the active material region have sufficient fluorescent material for identification during detection. In this embodiment, a fluorescent coating device 10 can be used to coat the fluorescent agent onto the edges of the active material region of the battery electrode 400, which facilitates the identification of target features during alignment detection.

[0067] In this embodiment, the battery electrode 400 includes a metal foil and an active material located on at least one side of the metal foil, wherein the region where the active material is located is the active material region of the battery electrode 400. In one example, such as... Figure 2As shown, the anode electrode 410 is composed of an anode metal foil 412 and anode active materials 411 on both sides. The area where the anode active materials 411 are located is the anode active material region 4111 of the anode electrode 410. The cathode electrode 420 is composed of a cathode metal foil 422, cathode active materials 421 on both sides of the cathode metal foil 422, and a ceramic coating. The area where the cathode active materials 421 are located is the cathode active material region 4211, and the area where the ceramic coating is located is the ceramic coating region 4213. The ceramic coating region 4213 is adjacent to the cathode active material region 4211. In this embodiment, the edge of the active material region of the battery electrode 400 refers to the edge region of the anode active material region 4111 or the cathode active material region 4211. Specifically, it refers to the part of the region extending away from the anode active material region 4111 and the anode electrode side surface 4112 extending along the thickness direction of the anode electrode 410, or the part of the region extending away from the cathode electrode side surface 4212 extending along the thickness direction of the cathode electrode 420, or the part of the region extending away from the cathode electrode side surface 4212 extending along the thickness direction of the cathode electrode 420, or the part of the region extending away from the ceramic coating region 4213 at the boundary of the cathode active material region 4211 and the ceramic coating region 4213.

[0068] In this embodiment, the unwinding mechanism 200 can be any type of mechanism capable of unwinding the battery electrode 400. Multiple transfer rollers 100 can be used to transfer the battery electrode 400. In one example, the transfer roller 100 may include a take-up roller and a conveyor roller. Multiple coating units 300 can be used, and each coating unit 300 can simultaneously coat a fluorescent agent onto multiple edges of the active material region of the battery electrode 400. For example, coating the edge of the anode active material region 4111 forms an anode fluorescent region 431, and coating the edge of the cathode active material region 4211 forms a cathode fluorescent region 432. The fluorescent agent is a fluorescent material that emits a fluorescent signal under irradiation from an excitation source of a specific frequency.

[0069] In this embodiment, the unwinding mechanism 200 unwinds the battery electrode 400, and the transfer roller 100 transfers the battery electrode 400 during rotation, that is, it drives the battery electrode 400 to move continuously. During the movement of the battery electrode 400, the coating unit 300 can apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400.

[0070] In this embodiment, the battery electrode 400 is unwound by the unwinding mechanism 200 and transported by the transfer roller 100. During the winding process, the coating unit 300 applies fluorescent agent to the edge of the active material region of the battery electrode 400, making the edge features of the active material region of the battery electrode 400 easier to identify in the detection image, thereby improving the accuracy of image detection. Moreover, applying the fluorescent agent directly to the target detection area—the edge of the active material region—saves fluorescent material and makes the detection more targeted.

[0071] According to some embodiments of this application, the coating unit 300 includes an extrusion head 301 configured to abut against the edge of the active material region of the battery electrode 400.

[0072] In this embodiment, as the battery electrode 400 is continuously moved by the transfer roller 100, its position may change. Simultaneously, due to variations in the thickness of the active material region, the thickness of the battery electrode 400 may also change. During the fluorescent agent coating process, the fluorescent agent needs to be continuously applied to the edge of the active material region of the battery electrode 400 to facilitate subsequent edge detection.

[0073] The coating unit 300 includes an extrusion head 301, which is used to abut against the edge of the active material region of the battery electrode 400 to coat the fluorescent agent onto the edge of the active material region of the battery electrode 400. In one example, the extrusion head 301 includes an extrusion head body and a receiving cavity located within the extrusion head body. The receiving cavity is used to contain the fluorescent agent and is connected to an external supply pipeline. The extrusion head body has a discharge port, and the end of the discharge port has a normally closed control valve. When the extrusion head body abuts against the battery electrode 400, the contact pressure between the two will open the control valve, causing the fluorescent agent in the receiving cavity to flow out and be coated onto the surface of the edge of the active material region of the battery electrode 400.

[0074] In this embodiment of the application, the coating unit 300 may include one or more extrusion heads 301, each extrusion head 301 may abut against an edge of the active material region of the battery electrode 400.

[0075] In this embodiment, by pressing the extrusion head 301 against the edge of the active material area of ​​the battery electrode 400, the fluorescent agent can be accurately applied to the edge of the active material area of ​​the battery electrode 400, thereby facilitating image detection and recognition.

[0076] According to some embodiments of this application, the coating unit 300 further includes a pressure sensor 302, which is used to detect the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400.

[0077] In this embodiment, because the extrusion head 301 abuts against the edge of the active material region of the battery electrode 400, excessive contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 may cause damage to the coating of the battery electrode 400. Conversely, insufficient contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 may result in no contact, preventing the extrusion head 301 from applying the fluorescent agent to the edge of the active material region of the battery electrode 400.

[0078] Figure 3 This is a schematic diagram of an extrusion head 301 provided in some embodiments of this application. For example... Figure 3 As shown, to facilitate the detection of the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400, the pressure sensor 302 can be located at the end where the extrusion head 301 contacts the battery electrode 400. In another example, the pressure sensor 302 can also be located inside the extrusion head 301, indirectly obtaining the contact pressure between the extrusion head 301 and the battery electrode 400 by detecting the pressure change of the liquid in the containment cavity.

[0079] In this embodiment, the number of pressure sensors 302 can be multiple, and the number of pressure sensors 302 can correspond to the number of extrusion heads 301.

[0080] In this embodiment, the pressure sensor 302 included in the coating unit 300 is used to detect the contact pressure between the extrusion head 301 and the edge of the active material area of ​​the battery electrode 400. The contact pressure between the extrusion head 301 and the edge of the active material area of ​​the battery electrode 400 can be detected in real time, thereby understanding the edge contact status between the extrusion head 301 and the active material area of ​​the battery electrode 400 in real time. By detecting the contact pressure, the coating quality of the fluorescent agent can be judged, and the coating effect of the fluorescent agent can be improved.

[0081] like Figure 1 As shown, in some embodiments, the extrusion head 301 and the transfer roller 100 are respectively disposed on opposite sides of the battery electrode 400.

[0082] In this embodiment, by placing the extrusion head 301 and the transfer roller 100 on opposite sides of the battery electrode 400, the extrusion head 301 can better apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400, thereby giving the fluorescent coating device 10 a better coating effect.

[0083] Figure 4 This is a schematic diagram of the structure of another fluorescent coating device 10 provided in some embodiments of this application, as shown below. Figure 4 As shown, the fluorescent coating device 10 also includes a first adjustment unit 303, which is configured to drive the extrusion head 301 closer to or further away from the active material region, so that the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 is maintained within a preset pressure range.

[0084] In this embodiment, the first adjustment unit 303 can be connected to the pressure sensor 302. The first adjustment unit 303 can drive the extrusion head 301 to move closer to or away from the active material area based on the contact pressure between the extrusion head 301 and the edge of the active material area of ​​the battery electrode 400 detected by the pressure sensor 302.

[0085] In this embodiment, the first adjustment unit 303 can be connected to the coating unit 300. When the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 exceeds a preset pressure range, the first adjustment unit 303 can adjust the position of the coating unit 300, driving the extrusion head 301 closer to or further away from the active material region of the battery electrode 400, thereby restoring the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 to the preset pressure range. Alternatively, the first adjustment unit 303 can be located within the coating unit 300 and connected to the extrusion head 301. When the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 exceeds a preset pressure range, the first adjustment unit 303 can directly drive the extrusion head 301 closer to or further away from the active material region of the battery electrode 400, restoring the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 to the preset pressure range.

[0086] In this embodiment, the extrusion head 301 is driven to move closer to or further away from the active material area of ​​the battery electrode 400 by the first adjustment unit 303, so that the contact pressure between the extrusion head 301 and the edge of the active material area of ​​the battery electrode 400 is maintained within a preset pressure range, so that the extrusion head 301 can adapt to the thickness change of the active material area of ​​the electrode and ensure the coating effect of the fluorescent agent.

[0087] In some embodiments, such as Figure 4 As shown, the first adjustment unit 303 includes a first drive unit 3031 and a first transmission unit 3032. The first transmission unit 3032 is connected to the first drive unit 3031 and the extrusion head 301 respectively. The first drive unit 3031 is configured to drive the extrusion head 301 to move through the first transmission unit 3032 so that the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 is maintained within a preset pressure range.

[0088] In this embodiment, the first drive unit 3031 can be modular and can be combined with various components to provide power to the first transmission unit 3032, thereby driving the first transmission unit 3032 to move. The first drive unit 3031 can be connected to multiple first transmission units 3032 simultaneously, and the first transmission unit 3032 can also be connected to multiple extrusion heads 301 simultaneously.

[0089] In this embodiment, the first driving unit 3031 can simultaneously drive multiple extrusion heads 301 to move through the first transmission unit 3032, so that the contact pressure between the multiple extrusion heads 301 and the edge of the active material region of the battery electrode 400 is maintained within a preset pressure range.

[0090] In this embodiment, the first driving unit 3031 drives the first transmission unit 3032, thereby driving the extrusion head 301 to move, so that the contact pressure between the extrusion head 301 and the edge of the active material area of ​​the battery electrode 400 is maintained within a preset pressure range, so as to ensure the coating effect of the fluorescent agent under different thickness fluctuations of the battery electrode 400.

[0091] In some embodiments, such as Figure 4 As shown, the fluorescent coating device 10 also includes a second adjustment unit 304, which is configured to drive the coating unit 300 to move along the width direction of the battery electrode 400.

[0092] During the transport of the battery electrode 400, it is inevitable that the battery electrode 400 will shift, for example, along the axial direction of the transport roller 100. When the shift of the battery electrode 400 is too large, the edge of the active material area may no longer be in contact with the coating unit 300, and the coating unit 300 will be unable to apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400. Therefore, if it is necessary to form a continuous fluorescent area at the edge of the active material area of ​​the battery electrode 400, the edge of the active material area of ​​the battery electrode 400 must be kept in at least partial contact with the coating unit 300 during the transport of the battery electrode 400, so that the coating unit 300 can apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400.

[0093] In this embodiment, the second adjustment unit 304 can drive the coating unit 300 to move along the width direction of the battery electrode 400, so that the edge of the active material region of the battery electrode 400 is at least partially in contact with the coating unit 300.

[0094] In this embodiment of the application, the second adjustment unit 304 drives the coating unit 300 to move along the width direction of the battery electrode 400, so that the edge of the active material region of the battery electrode 400 is at least partially in contact with the coating unit 300, so that even if the battery electrode 400 is offset, the coating unit 300 can still apply the fluorescent agent to the target position.

[0095] In some embodiments, such as Figure 4 As shown, the second adjustment unit 304 includes a second drive unit 3041 and a second transmission unit 3042. The second transmission unit 3042 is connected to the second drive unit 3041 and the coating unit 300, respectively. The first drive unit 3031 is configured to drive the coating unit 300 to move via the second transmission unit 3042, so that the edge of the active material region of the battery electrode 400 at least partially contacts the coating unit 300.

[0096] In this embodiment, the second drive unit 3041 can be modular and can be combined with various components to provide power to the second transmission unit 3042, such as a motor or pump set. The second transmission unit 3042 can be various types of transmission components that transmit power to the coating unit 300, such as a lead screw drive unit, a gear drive unit, etc. The second drive unit 3041 can be connected to multiple second transmission units 3042 simultaneously, and the second transmission unit 3042 can also be connected to one or more coating units 300 simultaneously.

[0097] The second drive unit 3041 can be a power component of the same type as the first drive unit 3031, or it can be a power component of a different type. In one example, the second drive unit 3041 can be a multiplexed version of the first drive unit 3031, that is, the first drive unit 3031 is multiplexed into the second drive unit 3041. The coating unit 300 is driven to move in different directions through the first transmission unit 3032 and the second transmission unit 3043 respectively, so as to achieve the adjustment of contact pressure and contact position.

[0098] In this embodiment, the second driving unit 3041 can drive the coating unit 300 to move through the second transmission unit 3042, so that the edge of the active material region of the battery electrode 400 is at least partially in contact with the coating unit 300, so that the coating unit 300 can coat the fluorescent agent to the edge of the active material region of the battery electrode 400.

[0099] In some embodiments, the width of the fluorescent region formed by the coating unit 300 coating the edge of the active material region of the battery electrode 400 is greater than or equal to a preset threshold.

[0100] like Figure 2As shown, the width of the anode fluorescent region 431 formed by coating unit 300 at the edge of the anode active material region 4111 on the surface of anode electrode 410 is d1. Since the cathode active material region 4211 is adjacent to the ceramic coating region 4213, the cathode fluorescent region 432 formed during coating may have part located on the surface of the ceramic coating region 4213 and another part located on the surface of the edge of the cathode active material region 4211. The width of the cathode fluorescent region 432 formed by coating unit 300 at the edge of the cathode active material region 4211 on the surface of cathode electrode 420, located on the surface of the cathode active material region 4211, is d2. In this embodiment, the width of the fluorescent region formed by coating at the edge of the active material region of battery electrode 400 refers to the width of the portion formed on the surface of the active material region of battery electrode.

[0101] In this embodiment, the width of the fluorescent area formed by the coating unit 300 at the edge of the active material area of ​​the battery electrode 400 is greater than or equal to a preset threshold. This allows the edge of the active material area to form a fluorescent area of ​​sufficient width so that the edge position of the battery electrode 400 can be determined by feature recognition during image detection, thereby more accurately evaluating the alignment of the battery electrode 400.

[0102] Figure 5 This is a schematic diagram of a fluorescent coating device 10 provided in other embodiments of this application, such as... Figure 5 As shown, the battery electrode 400 includes a first side and a second side opposite to each other; the coating unit 300 includes a first coating unit 310 and a second coating unit 320, wherein the first coating unit 310 includes a first extrusion head 311 and a second extrusion head 312 arranged at intervals along the axial direction of the transfer roller 100, and the first extrusion head 311 and the second extrusion head 312 respectively contact the edge of the active material area on the first side; the second coating unit 320 includes a third extrusion head 321 and a fourth extrusion head 322 arranged at intervals along the axial direction of the transfer roller 100, and the third extrusion head 321 and the fourth extrusion head 322 respectively contact the edge of the active material area on the second side.

[0103] The first extrusion head 311, the second extrusion head 312, the third extrusion head 321, and the fourth extrusion head 322 can be the same extrusion head or extrusion heads of different types. The first extrusion head 311 and the second extrusion head 312 can be connected to the transfer roller 100 through a connecting structure, and the third extrusion head 321 and the fourth extrusion head 322 can be connected to the transfer roller 100 through another connecting structure. In one example, the first coating unit 310 and the second coating unit 320 can be connected to corresponding adjustment mechanisms to realize the movement of the first extrusion head 311, the second extrusion head 312, the third extrusion head 321, and the fourth extrusion head 322 to accommodate the thickness changes of the battery electrode sheet 400 and the offset along the axial direction of the transfer roller 100.

[0104] In this embodiment, the first extrusion head 311 and the second extrusion head 312, which are arranged at intervals along the axial direction of the transfer roller 100, of the first coating unit 310 contact the edge of the active material area on the first side, respectively; the third extrusion head 321 and the fourth extrusion head 322, which are arranged at intervals along the axial direction of the transfer roller 100, of the second coating unit 320 contact the edge of the active material area on the second side, respectively. This allows for the simultaneous coating of fluorescent materials on the active material areas on the two opposite sides of the battery electrode 400, thereby improving coating efficiency.

[0105] An embodiment of the second aspect of this application provides a method for fluorescent coating of a battery electrode 400. Figure 6 A flowchart of a fluorescent coating method for a battery electrode 400 provided in some embodiments of this application is shown below. Figure 6 As shown, the application method includes:

[0106] Step S601: Position the edge of the active material area of ​​the coating unit 300 and the battery electrode 400.

[0107] Step S602: Control the coating unit 300 to apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400 in the transport state.

[0108] In this embodiment, the coating unit 300 may be the coating unit 300 described in the above embodiments. In one example, combined with Figure 1 As shown, the coating unit 300 includes an extrusion head 301, which moves the coating unit 300 to a position that aligns with the edge of the active material area of ​​the battery electrode 400. This means that the extrusion head 301 is moved to a position corresponding to the edge of the active material area of ​​the battery electrode 400 and comes into contact with it, thereby completing the positioning of the coating unit 300 to the active material area of ​​the battery electrode 400.

[0109] In this embodiment of the application, the battery electrode 400 is in a conveying state during the winding process. The battery electrode 400 moves continuously. During the movement of the battery electrode 400, the coating unit 300 can apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400.

[0110] In this embodiment, by positioning the coating unit 300 at the edge of the active material region of the battery electrode 400, the coating unit 300 is controlled to apply the fluorescent agent to the edge of the active material region of the battery electrode 400 in the transport state. This makes the edge features of the active material region of the battery electrode 400 easier to identify in the detection image, thereby improving the accuracy of image detection. Moreover, by directly applying the fluorescent material to the target detection area—the edge of the active material region—it saves fluorescent material and makes the detection more targeted.

[0111] In some embodiments, step S601 includes: moving the coating unit 300 to a position corresponding to the edge of the active material region of the battery electrode 400; moving the coating unit 300 to make the coating unit 300 contact the edge of the active material region of the battery electrode 400, and adjusting the contact pressure between the two to a preset pressure range.

[0112] During the transport of the battery electrode 400, it is inevitable that the battery electrode 400 will shift, for example, along the axial direction of the transport roller 100. When the shift of the battery electrode 400 is too large, the edge of the active material area of ​​the battery electrode 400 may no longer be in contact with the coating unit 300. In this case, the coating unit 300 may not be able to apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400, and the fluorescent agent may be applied to the outside of the battery electrode 400 or completely to the active material area of ​​the battery electrode 400. Therefore, if it is necessary to form a continuous fluorescent area at the edge of the active material area of ​​the battery electrode 400, the edge of the active material area of ​​the battery electrode 400 must be kept in at least partial contact with the coating unit 300 during the transport of the battery electrode 400, so that the coating unit 300 can apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400.

[0113] In this embodiment, since the extrusion head 301 in the coating unit 300 abuts against the edge of the active material area of ​​the battery electrode 400, excessive contact pressure between the extrusion head 301 and the edge of the active material area of ​​the battery electrode 400 may cause damage to the coating of the battery electrode 400. Conversely, insufficient contact pressure may result in no contact between the extrusion head 301 and the edge of the active material area of ​​the battery electrode 400, preventing the extrusion head 301 from applying the fluorescent agent to the edge of the active material area of ​​the battery electrode 400. The preset pressure range can be a pressure range within which the extrusion head in the coating unit 300 can apply the fluorescent agent to the edge of the active material area of ​​the battery electrode 400 without causing damage to the battery electrode 400.

[0114] In this embodiment, by moving the coating unit 300 to the position corresponding to the edge of the active material region of the battery electrode 400; by moving the coating unit 300 to make the coating unit 300 contact the edge of the active material region of the battery electrode 400, and adjusting the contact pressure between the two to a preset pressure range, the coating unit 300 can more accurately coat the fluorescent material onto the edge of the active material region of the battery electrode 400.

[0115] In some embodiments, step S602 further includes: obtaining the contact pressure between the coating unit 300 and the battery electrode 400; and outputting a coating abnormality signal in response to the contact pressure being greater than a preset pressure range.

[0116] In this embodiment, the contact pressure between the coating unit 300 and the battery electrode 400 can be obtained by a pressure sensor 302 located inside the coating unit 300. Coating abnormality signals can be output via voice broadcast, screen display, or by sending information to a maintenance personnel's mobile phone; the abnormality signal may include whether the pressure exceeds a preset pressure range, and may also include a specific pressure value.

[0117] In this embodiment, the contact pressure between the coating unit 300 and the battery electrode 400 is obtained by the pressure sensor 302. In response to the contact pressure being greater than the preset pressure range, a coating abnormality signal is output, which can enable relevant personnel to understand the coating situation in a timely manner and take positive response measures in time when there is an abnormality.

[0118] In some embodiments, after outputting a coating abnormality signal in response to a contact pressure exceeding a preset pressure range, the method further includes: adjusting the contact pressure between the coating unit 300 and the battery electrode 400 to a preset pressure range based on the coating abnormality signal.

[0119] In one example, the contact pressure between the coating unit 300 and the battery electrode 400 can be adjusted by adjusting the distance between the coating unit 300 and the battery electrode 400.

[0120] In this embodiment, a first adjustment unit 303 can be used to adjust the contact pressure between the coating unit 300 and the battery electrode 400. The first adjustment unit 303 can adjust the position of the coating unit 300, for example, by adjusting the position of the extrusion head 301, so that the contact pressure between the coating unit 300 and the edge of the active material region of the battery electrode 400 returns to a preset pressure range. The first adjustment unit 303 can also adjust the position of the battery electrode 400, so that the contact pressure between the coating unit 300 and the edge of the active material region of the battery electrode 400 returns to a preset pressure range.

[0121] In this embodiment, based on the coating abnormality signal, the contact pressure between the coating unit 300 and the battery electrode 400 is adjusted to a preset pressure range according to the actual contact situation, so as to ensure the coating effect of the fluorescent agent under different thickness fluctuations of the battery electrode 400.

[0122] The fluorescent coating method of this application will be further described below with reference to a specific embodiment. Figure 7 A flowchart illustrating another fluorescent coating method for a battery electrode 400 provided in some embodiments of this application; as shown below. Figure 7 As shown, the fluorescent coating method includes the following steps:

[0123] Step S701, Start: Move the coating unit 300 to the position corresponding to the edge of the active material area of ​​the battery electrode 400, move the coating unit 300 so that the coating unit 300 contacts the edge of the active material area of ​​the coating unit 300 of the battery electrode 400, and adjust the contact pressure between the two to a preset pressure range.

[0124] Step S702, electrode movement: The battery electrode 400 is moved by the transfer roller 100.

[0125] Step S703, whether the pressure fluctuation between the extrusion head 301 and the battery electrode 400 is qualified: obtain the contact pressure between the extrusion head 301 and the battery electrode 400, and determine whether the pressure fluctuation between the extrusion head 301 and the battery electrode 400 is greater than the preset pressure range. If yes, proceed to step S704; otherwise, proceed to step S705.

[0126] Step S704, alarm prompts engineer for maintenance: output coating abnormality signal, the engineer or adjustment device adjusts the contact pressure between the extrusion head 301 and the battery electrode 400 to the preset pressure range based on the coating abnormality signal, and then proceeds to step S706.

[0127] Step S705, Normal conveyor belt movement: Control the movement of the battery electrode 400 so that the edge of the active material region of the battery electrode 400 is at least partially in contact with the extrusion head 301.

[0128] Step S706, Fluorescent area coating width qualified: The edge of the active material area of ​​the battery electrode 400 is at least partially in contact with the coating unit 300 so that the width of the fluorescent area formed at the edge of the active material area of ​​the battery electrode 400 is greater than or equal to a preset threshold.

[0129] Step S707, End: until the fluorescent coating of the battery electrode 400 is completed.

[0130] In some embodiments, step S602 further includes: obtaining offset information of the edge of the active material region of the battery electrode 400 relative to the coating unit 300; and controlling the battery electrode 400 and / or the coating unit 300 to move so that the edge of the active material region of the battery electrode 400 at least partially contacts the coating unit 300 based on the offset information.

[0131] In this embodiment, the offset information refers to the positional relationship between the edge of the active material region of the battery electrode 400 and the coating unit 300, such as an offset distance. When the offset information indicates that the edge of the active material region of the battery electrode 400 may no longer be in contact with the coating unit 300, the coating unit 300 will be unable to apply the fluorescent agent to the edge of the active material region of the battery electrode 400. Therefore, if it is necessary to form a continuous fluorescent region at the edge of the active material region of the battery electrode 400, the edge of the active material region of the battery electrode 400 must at least partially remain in contact with the coating unit 300 during the transport of the battery electrode 400 so that the coating unit 300 can apply the fluorescent agent to the edge of the active material region of the battery electrode 400.

[0132] In this embodiment, the second adjustment unit 304 can adjust the position of the battery electrode 400 based on offset information. In another example, the second adjustment unit 304 can adjust the position of the coating unit 300 based on offset information. In yet another example, the second adjustment unit 304 can also simultaneously adjust the position of the battery electrode 400 and the position of the coating unit 300 based on offset information, such that the edge of the active material region of the battery electrode 400 remains at least partially in contact with the coating unit 300.

[0133] The fluorescent coating method for the battery electrode 400 in this application will be further described below with reference to a specific embodiment. Figure 8 A flowchart illustrating a fluorescent coating method for a battery electrode 400 provided in other embodiments of this application; such as Figure 8 As shown, the fluorescent coating method includes the following steps:

[0134] Step S801, Start: Align and position the coating unit 300 with the edge of the active material area of ​​the battery electrode 400.

[0135] Step S802, electrode movement: The battery electrode 400 is moved by the transfer roller 100.

[0136] Step S803: Monitor whether the electrode sheet is offset: The offset information of the edge of the active material area of ​​the battery electrode sheet 400 relative to the coating unit 300 can be obtained by an image detection device or the like; the offset information may include the offset distance between the extrusion head 301 and the battery electrode sheet 400 along the axial direction of the transfer roller 100. When the offset distance does not exceed the set range, proceed to step S805; when the offset distance exceeds the set range, proceed to step S804 or step S806.

[0137] Step S804, Extrusion head correction: When the offset distance of the battery electrode 400 exceeds the set range, control the extrusion head 301 to move in the opposite direction to the offset direction of the battery electrode 400, so that the edge of the active material area of ​​the battery electrode 400 at least partially contacts the extrusion head 301.

[0138] Step S805, normal movement: When the offset distance of the battery electrode 400 does not exceed the set range, the battery electrode 400 continues to be conveyed by the transmission roller 100.

[0139] Step S806, electrode correction: When the offset distance of the battery electrode 400 exceeds the set range, control the battery electrode 400 to move in the opposite direction to the offset direction so that the edge of the active material area of ​​the battery electrode 400 at least partially contacts the extrusion head 301.

[0140] Step S807, the positional relationship between the extrusion head 301 and the battery electrode 400 is qualified: the edge of the active material area of ​​the battery electrode 400 is at least partially in contact with the extrusion head 301.

[0141] Step S808, End.

[0142] In this embodiment, the offset information of the edge of the active material region of the battery electrode 400 relative to the coating unit 300 is obtained; based on the offset information, the movement of the battery electrode 400 and / or the coating unit 300 is controlled so that even if the battery electrode 400 is offset, the coating unit 300 can still apply the fluorescent agent to the target position.

[0143] In some embodiments, obtaining the offset information of the edge of the active material region of the battery electrode 400 relative to the coating unit 300 includes: obtaining the width information of the fluorescent region of the edge of the active material region of the battery electrode 400; and determining the offset information of the edge of the active material region of the battery electrode 400 relative to the coating unit 300 based on the width information of the fluorescent region.

[0144] The width information of the fluorescent region refers to the width of the fluorescent region formed by the fluorescent agent on the surface of the active material region of the battery electrode 400, along a direction parallel to the surface of the battery electrode 400. Figure 2 As shown, the width information can be the width d1 of the anodic fluorescent region 431 at the edge of the active material region of the anode electrode 410, or the width d2 of the cathodic fluorescent region 432 at the edge of the active material region of the cathode electrode 420. When either d1 or d2 is less than a certain threshold, it indicates that an offset has occurred. The offset information can be the offset distance; by using the width information of the fluorescent region, the offset distance of the edge of the active material region of the battery electrode 400 relative to the coating unit 300 can be determined.

[0145] In this embodiment, by obtaining the width information of the fluorescent region at the edge of the active material region of the battery electrode 400, and based on the width information of the fluorescent region, the offset information of the edge of the active material region of the battery electrode 400 relative to the coating unit 300 is determined, which can make the determined offset information more accurate.

[0146] In some embodiments, controlling the movement of the battery electrode 400 and / or the coating unit 300 based on offset information to make the edge of the active material region of the battery electrode 400 at least partially contact the coating unit 300 includes: the offset information including an offset distance; controlling the movement of the coating unit 300 to make the edge of the active material region of the battery electrode 400 at least partially contact the coating unit 300 in response to the offset distance being greater than a first preset distance and less than a second preset distance; and controlling the movement of the battery electrode 400 to make the edge of the active material region of the battery electrode 400 at least partially contact the coating unit 300 in response to the offset distance being greater than or equal to the second preset distance.

[0147] In this embodiment, the first preset distance can be 0.5 mm, and the second preset distance can be 1.5 mm. When the offset distance is greater than the first preset distance and less than the second preset distance, the edge of the active material region of the battery electrode 400 is offset relatively small relative to the coating unit 300. In this case, it is only necessary to control the movement of the coating unit 300 to make the edge of the active material region of the battery electrode 400 at least partially contact the coating unit 300. When the offset distance is greater than or equal to the second preset distance, the edge of the active material region of the battery electrode 400 is offset relatively large relative to the coating unit 300. In this case, controlling the movement of the coating unit 300 cannot make the edge of the active material region of the battery electrode 400 at least partially contact the coating unit 300. It is necessary to control the movement of the battery electrode 400 to make the edge of the active material region of the battery electrode 400 at least partially contact the coating unit 300.

[0148] In this embodiment, controlling the movement of the coating unit 300 or the battery electrode 400 by offset distance so that the edge of the active material region of the battery electrode 400 at least partially contacts the coating unit 300 can simplify the control process.

[0149] According to some embodiments of this application, step S602 further includes: obtaining width information of the fluorescent region at the edge of the active material region of the battery electrode 400; and controlling the battery electrode 400 and / or coating unit 300 to move based on the width information of the fluorescent layer so that the edge of the active material region of the battery electrode 400 at least partially contacts the coating unit 300.

[0150] When the battery electrode 400 shifts, the contact position between the edge of the active material area of ​​the battery electrode 400 and the coating unit 300 changes. This leads to a change in the width of the fluorescent area formed by the fluorescent agent at the edge of the active material area of ​​the battery electrode, for example, it may become smaller or equal to 0 (i.e., no fluorescent area is formed at the edge). On the other hand, the contact pressure between the coating unit 300 and the battery electrode 400 is directly related to the discharge gap between them. When the contact pressure changes, it means that both the coating gap between the coating unit 300 and the battery electrode 400 and the amount of fluorescent agent applied have changed, resulting in a change in the width of the formed fluorescent area. Therefore, the width information of the fluorescent area can be used to determine whether the current state of the fluorescent agent application by the coating unit 300 is abnormal, and corresponding control commands can be generated for adjustment. In one example, the detection of the width of the fluorescent area, the detection of the contact pressure between the coating unit 300 and the battery electrode 400, and the detection of the shift information of the battery electrode 400 can be combined to improve the coating effect of the fluorescent agent.

[0151] In this embodiment, by detecting the width information of the fluorescent region, the movement of the battery electrode 400 and / or the coating unit 300 can be controlled so that the edge of the active material region of the battery electrode 400 at least partially contacts the coating unit 300, making the control process simpler.

[0152] In some embodiments, the edge of the active material region of the battery electrode 400 is at least partially in contact with the coating unit 300 so that the width of the fluorescent region formed at the edge of the active material region of the battery electrode 400 is greater than or equal to a preset threshold.

[0153] In this embodiment, by having at least a portion of the edge of the active material region of the battery electrode 400 contact the coating unit 300 so that the width of the fluorescent region formed at the edge of the active material region of the battery electrode 400 is greater than or equal to a preset threshold, the fluorescent region can be better detected.

[0154] An embodiment of the third aspect of this application provides a battery winding detection method. Figure 9 A flowchart of a battery winding detection method provided in some embodiments of this application is shown below. Figure 9 As shown, the detection method includes:

[0155] Step S901: Apply fluorescent agent to the edge of the active material region of the battery electrode 400 using a fluorescent coating method.

[0156] Step S902: Obtain a fluorescence detection image of the edge of the active material region of the battery electrode 400.

[0157] Step S903: Determine the winding state of the battery based on the fluorescence detection image.

[0158] In this embodiment, the fluorescent coating method or apparatus described in the above embodiments can be used to coat the fluorescent agent onto the edge of the active material region of the battery electrode 400, so that a fluorescent region with a sufficient width is formed on the surface of the edge of the active material region of the battery electrode 400.

[0159] In this embodiment, since the fluorescent material is coated on the surface of the edge of the active material region of the battery electrode 400, the obtained fluorescence detection image also includes the image features of the edge of the active material region of the battery electrode 400. In one example, a laser source can be used to irradiate the electrode to excite the fluorescent material at the edge of the active material region of the battery electrode 400, thereby emitting light of a specific wavelength, which passes through a polarizer and enters the camera to form a fluorescence detection image.

[0160] In this embodiment, by identifying the edge features of the active material region in the fluorescence detection image, the position information of the battery electrode 400 can be obtained, and the winding state of the battery can be determined based on this position information. For example, the alignment degree of the battery electrode 400 can be calculated using the position information of the battery electrode 400, and the calculation result can be compared with a preset judgment threshold. If the alignment degree does not exceed the range of the judgment threshold, the alignment degree of the battery electrode 400 is determined to be normal, that is, the winding state of the battery is normal; otherwise, the alignment degree of the battery electrode 400 is determined to be abnormal, that is, the winding state of the battery is abnormal.

[0161] In this embodiment of the application, the fluorescence detection image of the edge of the active material region of the battery electrode 400 can be used to determine whether there is an abnormality in the battery winding state, which is beneficial for real-time monitoring of the working status of the winding process and improving production efficiency.

[0162] In some embodiments, the battery electrode 400 includes a first electrode and a second electrode, and the fluorescence detection image includes the first electrode at least partially wound on a winding needle and the second electrode not yet wound on the winding needle.

[0163] In this embodiment, the first electrode can be a cathode electrode 420, and the second electrode can be an anode electrode 410.

[0164] In this embodiment, the fluorescence detection image includes at least a first electrode wrapped around a winding needle and a second electrode that has not yet been wound onto the winding needle, enabling the state of both electrodes to be captured at one location, thereby simplifying the process of determining whether there is an abnormality in the battery winding state.

[0165] In some embodiments, step S903 includes: determining the positional relationship between the edge of the first electrode and the edge of the second electrode based on the fluorescence detection image; and determining the winding state of the battery based on the positional relationship between the edge of the first electrode and the edge of the second electrode.

[0166] In this embodiment, the positional relationship between the edge of the first electrode and the edge of the second electrode can include alignment and misalignment. For example, when the distance between the edge of the first electrode and the edge of the second electrode meets a preset threshold, the positional relationship between the edge of the first electrode and the edge of the second electrode can be considered aligned, and the winding state of the battery is normal; when the distance between the edge of the first electrode and the edge of the second electrode does not meet the preset threshold, the positional relationship between the edge of the first electrode and the edge of the second electrode can be considered misaligned, and the winding state of the battery is abnormal.

[0167] In this embodiment, the positional relationship between the edge of the first electrode and the edge of the second electrode is determined based on the fluorescence detection image, and the winding state of the battery is determined based on the positional relationship between the edge of the first electrode and the edge of the second electrode, which can improve the accuracy of judging the winding state of the battery.

[0168] An embodiment of the fourth aspect of this application provides a battery winding device. Figure 10 A schematic diagram of a battery winding device 1000 provided for some embodiments of this application, such as... Figure 10 As shown, the battery winding apparatus 1000 includes a fluorescent coating device 1001, a detection light source 1002, an image acquisition device 1003, and a processing unit 1004. The fluorescent coating device 1001 is configured to coat a fluorescent agent onto the edge of the active material region of the battery electrode 400; the detection light source 1002 is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode 400; the image acquisition device 1003 is configured to acquire a fluorescent detection image of the edge of the active material region of the battery electrode 400; and the processing unit 1004 is configured to identify the fluorescent detection image and determine the winding state of the battery.

[0169] The fluorescent coating device 1001 in this embodiment corresponds to the fluorescent coating device 10 in the previous embodiment, and the specific implementation details will not be repeated here.

[0170] In this embodiment of the application, the fluorescence detection image of the edge of the active material region of the battery electrode 400 can be used to determine whether there is an abnormality in the battery winding state, which is beneficial for real-time monitoring of the working status of the winding process and improving production efficiency.

[0171] Figure 11 A schematic diagram of a battery winding device 1000 provided for other embodiments of this application, such as... Figure 11As shown, the battery winding device 1000 further includes a winding assembly 1005, which includes a winding needle 10051 and a conveying assembly 10052. The conveying assembly 10052 is configured to wind the battery electrode 400 onto the surface of the winding needle 10051. The detection light source 1002 includes a first light source group 10021 and a second light source group 10022. The first light source group 10021 is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode 400 located at the first end of the winding needle 10051. The second light source group 10022 is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode 400 located at the second end of the winding needle. The first end and the second end are respectively located at both ends of the winding needle 10051 along the width direction of the electrode assembly.

[0172] In this embodiment, the conveying component 10052 may be composed of the conveying roller 100 and the unwinding mechanism 200 in the aforementioned embodiments, and is used to unwind the battery electrode 400, convey the battery electrode 400, and wind the battery electrode 400 onto the surface of the winding needle 10051.

[0173] In this embodiment, the first light source group 10021 and the second light source group 10022 can be the same, which can be any fluorescent laser light source that can project onto the edge of the active material region of the battery electrode 400. The positions of the first light source group 10021 and the second light source group 10022 are different. The first light source group 10021 provides a fluorescent laser light source that projects onto the edge of the active material region of the battery electrode 400 located at the first end of the winding needle 10051, and the second light source group 10022 provides a fluorescent laser light source that projects onto the edge of the active material region of the battery electrode 400 located at the second end of the winding needle 10051.

[0174] In this embodiment, the first light source group 10021 and the second light source group 10022 can simultaneously provide fluorescent laser light sources that are projected onto the edges of the active material regions of the battery electrode 400 located at both ends of the winding needle 10051 along the width direction of the electrode assembly. This allows for comprehensive detection of the battery winding state and improves the accuracy of the detection results.

[0175] In some embodiments, the battery electrode includes a first electrode and a second electrode, such as... Figure 11As shown, the image acquisition device 1003 includes a first imaging unit 10031 and a second imaging unit 10032; the first imaging unit 10031 is configured to acquire a first fluorescence detection image, the first fluorescence detection image including a first electrode at least partially wound around a first end of a winding needle 10051 and a second electrode not yet wound around the first end of the winding needle 10051; the second imaging unit 10032 is configured to acquire a second fluorescence detection image, the second fluorescence detection image including a first electrode at least partially wound around a second end of the winding needle 10051 and a second electrode not yet wound around the second end of the winding needle 10051.

[0176] In this embodiment, the first imaging unit 10031 and the second imaging unit 10032 respectively acquire the first fluorescence detection image and the second fluorescence detection image of the first electrode sheet wound around the first electrode sheet of the winding needle 10051 and the second electrode sheet not yet wound around the second electrode sheet of the winding needle 10051 at both ends along the width direction of the electrode assembly. Since there is no crosstalk between the first imaging unit 10031 and the second imaging unit 10032, the detection results can be mutually verified, which improves the efficiency and accuracy of detection.

[0177] Some embodiments of this application also provide a battery cell, the battery cell including: an electrode assembly, the electrode assembly including a battery electrode 400, wherein the edge of the active material region of the battery electrode 400 has a fluorescent material.

[0178] The technical solution of this application will be further described below through a specific embodiment, such as... Figures 1 to 11 As shown, the battery winding apparatus 1000 includes a fluorescent coating apparatus 10, a detection light source 1002, an image acquisition device 1003, and a processing unit 1004. The detection light source 1002 is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode 400; the image acquisition device 1003 is configured to acquire a fluorescent detection image of the edge of the active material region of the battery electrode; and the processing unit 1004 identifies the fluorescent detection image and determines the winding state of the battery.

[0179] The fluorescent coating apparatus 10 includes a transfer roller 100, an unwinding mechanism 200, and a coating unit 300. The unwinding mechanism 200 is used to unwind the battery electrode 400, and the transfer roller 100 is configured to transfer the battery electrode 400. The coating unit 300 is configured to coat the fluorescent agent onto the edge of the active material region of the battery electrode 400. The width of the fluorescent region formed by the coating unit 300 at the edge of the active material region of the battery electrode 400 is greater than or equal to a preset threshold.

[0180] The coating unit 300 includes an extrusion head 301 and a pressure sensor 302. The extrusion head 301 is configured to abut against the edge of the active material region of the battery electrode 400. The extrusion head 301 and the transfer roller 100 are respectively disposed on opposite sides of the battery electrode 400. The pressure sensor 302 is used to detect the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400.

[0181] The fluorescent coating device 10 also includes a first adjustment unit 303, which includes a first drive unit 3031 and a first transmission unit 3032. The first transmission unit 3032 is connected to the first drive unit 3031 and the extrusion head 301 respectively. The first drive unit 3031 is configured to drive the extrusion head 301 to move through the first transmission unit 3032 so that the contact pressure between the extrusion head 301 and the edge of the active material region of the battery electrode 400 is maintained within a preset pressure range.

[0182] The fluorescent coating device 10 also includes a second adjustment unit 304, which includes a second drive unit 3041 and a second transmission unit 3042. The second transmission unit 3042 is connected to the second drive unit 3041 and the coating unit 300, respectively. The first drive unit 3031 is configured to drive the coating unit 300 to move via the second transmission unit 3042 so that the edge of the active material region of the battery electrode 400 at least partially contacts the coating unit 300.

[0183] The battery electrode 400 includes a first side and a second side opposite to each other; the coating unit 300 includes a first coating unit 310 and a second coating unit 320, wherein the first coating unit 310 includes a first extrusion head 311 and a second extrusion head 312 arranged at intervals along the axial direction of the transfer roller 100, which respectively contact the edge of the active material area on the first side; the second coating unit 320 includes a third extrusion head 321 and a fourth extrusion head 322 arranged at intervals along the axial direction of the transfer roller 100, which respectively contact the edge of the active material area on the second side.

[0184] Battery winding detection methods include:

[0185] A fluorescent coating method is used to coat the fluorescent agent onto the edge of the active material region of the battery electrode 400.

[0186] Figure 12 A flowchart of another fluorescent coating method provided in some embodiments of this application is shown, such as Figure 12 As shown, the fluorescent coating method includes the following steps:

[0187] Step S1201, Start: Move the coating unit 300 to the position corresponding to the edge of the active material area of ​​the battery electrode 400; move the coating unit 300 to make the coating unit 300 contact the edge of the active material area of ​​the battery electrode 400, and adjust the contact pressure between the two to a preset pressure range, and proceed to step S1102.

[0188] Step S1202, electrode movement: the unwinding mechanism 200 unwinds the battery electrode 400, and the battery electrode 400 is driven to move by the transfer roller 100.

[0189] Step S1203, detect whether the electrode is offset: obtain the contact pressure between the coating unit 300 and the battery electrode 400, obtain the offset information of the edge of the active material area of ​​the battery electrode 400 relative to the coating unit 300, the offset information includes the offset distance, in response to the offset distance being greater than the first preset distance and less than the second preset distance, proceed to step S1205; in response to the offset distance being greater than or equal to the second preset distance, proceed to step S1207; in response to the offset distance being less than the first preset distance, proceed to step S1206.

[0190] Step S1204, check whether the contact pressure between the extrusion head 301 and the electrode is qualified: determine whether the contact pressure fluctuation between the extrusion head 301 and the battery electrode 400 is greater than the preset pressure range. If yes, proceed to step S1209; otherwise, proceed to step S1208.

[0191] Step S1205, Extrusion head 301 correction: Control the movement of the extrusion head 301 so that the edge of the active material region of the battery electrode 400 is at least partially in contact with the extrusion head 301, and proceed to step S1110.

[0192] Step S1206, normal belt feeding: The battery electrode 400 moves continuously under the drive of the transmission roller 100, proceeding to step S1210.

[0193] Step S1207, electrode correction: control the battery electrode 400 to move in the opposite direction to the offset direction so that the edge of the active material area of ​​the battery electrode 400 is at least partially in contact with the coating unit 300, and proceed to step S1110.

[0194] Step S1208, normal belt feeding: The battery electrode 400 moves continuously under the drive of the transmission roller 100, proceeding to step S1210.

[0195] Step S1209, alarm prompts engineer maintenance: output coating abnormality signal, based on the coating abnormality signal, the staff or other adjustment equipment adjust the contact pressure between the extrusion head 301 and the battery electrode 400 to the preset pressure range, and proceed to step S1210.

[0196] Step S1210, Fluorescent area coating size qualified: The edge of the active material area corresponding to the battery electrode 400 is at least partially in contact with the coating unit 300 so that the width of the fluorescent area formed at the edge of the active material area of ​​the battery electrode 400 is greater than or equal to a preset threshold.

[0197] Step S1211, End.

[0198] Step S902: Obtain a fluorescence detection image of the edge of the active material region of the battery electrode 400.

[0199] Figure 13 A schematic diagram of a battery winding device 1000 provided for other embodiments of this application, such as... Figure 13 As shown, the conveying assembly 10052 is configured to wind the battery electrode 400 onto the surface of the winding needle 10051. The detection light source 1002 and the image acquisition device 1003 are fixed at a certain distance from the winding needle 10051 using a bracket. The image acquisition device 1003 may include a first imaging unit 10031 and a second imaging unit 10032. The first imaging unit 10031 and the second imaging unit 10032 can be cameras. One imaging unit is used to capture images of the cathode electrode 420 wound on the winding needle 10051 and the anode electrode 410 not yet wound onto the winding needle 10051 at the same end of the winding needle 10051 along the width direction of the electrode assembly. This allows for simultaneous monitoring of the cathode electrode 420 wound on the winding needle 10051 and the anode electrode 410 not yet wound onto the winding needle 10051 at both ends of the winding needle 10051 along the width direction of the electrode assembly during winding, in order to determine the winding state of the battery. The detection light source 1002 is located around the image acquisition device 1003. The detection light source 1002 includes a first light source group 10021 and a second light source group 10022. The first light source group 10021 is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode 400 located at the first end of the winding needle 10051. The second light source group 10022 is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode 400 located at the second end of the winding needle 10051. A polarizer is fixed approximately 15 to 20 millimeters in front of the image acquisition device 1003 to selectively transmit fluorescent reflected light from the edge of the active material region of the battery electrode 400, ensuring image quality.

[0200] Step S903: Determine the winding state of the battery based on the fluorescence detection image.

[0201] The fluorescence detection image is used to determine whether the winding state is normal or abnormal. When the winding state is abnormal, manual re-inspection or other methods of re-inspection are required.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for fluorescent coating of battery electrodes, characterized in that, include: Position the coating unit at the edge of the active material area of ​​the battery electrode; The coating unit is controlled to apply the fluorescent agent to the edge of the active material area of ​​the battery electrode in the transport state; Obtain the offset information of the edge of the active material region of the battery electrode relative to the coating unit; Based on the offset information, the battery electrode and / or the coating unit are controlled to move so that the edge of the active material region of the battery electrode at least partially contacts the coating unit; The offset information includes an offset distance. In response to the offset distance being greater than a first preset distance and less than a second preset distance, the coating unit is controlled to move so that the edge of the active material region of the battery electrode at least partially contacts the coating unit. In response to the offset distance being greater than or equal to the second preset distance, the battery electrode is controlled to move so that the edge of the active material region of the battery electrode at least partially contacts the coating unit.

2. The fluorescent coating method according to claim 1, characterized in that, The positioning of the edges of the coating unit and the active material region of the battery electrode includes: Move the coating unit to the position corresponding to the edge of the active material area of ​​the battery electrode; Move the coating unit to make it contact the edge of the active material region of the battery electrode, and adjust the contact pressure between the two to a preset pressure range.

3. The fluorescent coating method according to claim 1 or 2, characterized in that, The method of controlling the coating unit to apply the fluorescent agent to the edge of the active material region of the battery electrode in the transport state further includes: Obtain the contact pressure between the coating unit and the battery electrode; In response to the contact pressure exceeding a preset pressure range, an abnormal coating signal is output.

4. The fluorescent coating method according to claim 3, characterized in that, The method of responding to a coating abnormality signal when the contact pressure exceeds a preset pressure range further includes: Based on the coating abnormality signal, the contact pressure between the coating unit and the battery electrode is adjusted to a preset pressure range.

5. The fluorescent coating method according to claim 1, characterized in that, The step of obtaining the offset information of the edge of the active material region of the battery electrode relative to the coating unit includes: Obtain the width information of the fluorescent region at the edge of the active material region of the battery electrode; Based on the width information of the fluorescent region, the offset information of the edge of the active material region of the battery electrode relative to the coating unit is determined.

6. The fluorescent coating method according to claim 1 or 2, characterized in that, Controlling the coating unit to apply the fluorescent agent to the edge of the active material region of the battery electrode in the transport state further includes: Obtain the width information of the fluorescent region at the edge of the active material region of the battery electrode; Based on the width information of the fluorescent region, the battery electrode and / or the coating unit are controlled to move so that the edge of the active material region of the battery electrode at least partially contacts the coating unit.

7. A battery winding detection method, characterized in that, include: The fluorescent agent is applied to the edge of the active material region of the battery electrode using the fluorescent coating method as described in any one of claims 1 to 6. Obtain a fluorescence detection image of the edge of the active material region of the battery electrode; The winding state of the battery is determined based on the fluorescence detection image.

8. The battery winding detection method according to claim 7, characterized in that, The battery electrode includes a first electrode and a second electrode; The fluorescence detection image includes a first electrode that is at least partially wound onto the needle and a second electrode that is not yet wound onto the needle.

9. The battery winding detection method according to claim 8, characterized in that, Determining the winding state of the battery based on the fluorescence detection image includes: Based on the fluorescence detection image, the positional relationship between the edge of the first electrode and the edge of the second electrode is determined; The winding state of the battery is determined based on the positional relationship between the edges of the first electrode and the edges of the second electrode.

10. A fluorescent coating device, characterized in that, include: Unwinding mechanism, used for unwinding battery electrodes; A transfer roller is configured to transfer the battery electrodes; A coating unit is configured to coat a fluorescent agent onto the edge of the active material region of the battery electrode, and to coat the battery electrode using the fluorescent coating method as described in any one of claims 1 to 6.

11. The fluorescent coating apparatus according to claim 10, characterized in that, The coating unit includes an extrusion head configured to abut against the edge of the active material region of the battery electrode.

12. The fluorescent coating apparatus according to claim 11, characterized in that, The coating unit also includes a pressure sensor for detecting the contact pressure between the extrusion head and the edge of the active material region of the battery electrode.

13. The fluorescent coating apparatus according to claim 11 or 12, characterized in that, The extrusion head and the transfer roller are respectively disposed on opposite sides of the battery electrode.

14. The fluorescent coating apparatus according to claim 11 or 12, characterized in that, The fluorescent coating device further includes a first adjustment unit, which is configured to drive the extrusion head closer to or further away from the active material region, so that the contact pressure between the extrusion head and the edge of the active material region of the battery electrode is maintained within a preset pressure range.

15. The fluorescent coating apparatus according to claim 10 or 12, characterized in that, The fluorescent coating device further includes a second adjustment unit configured to drive the coating unit to move along the width direction of the battery electrode.

16. The fluorescent coating apparatus according to claim 10 or 12, characterized in that, The battery electrode includes a first side and a second side opposite to each other; The coating unit includes a first coating unit and a second coating unit. The first coating unit includes a first extrusion head and a second extrusion head arranged at intervals along the axial direction of the transfer roller, the first extrusion head and the second extrusion head respectively contacting the edge of the active material area on the first side; the second coating unit includes a third extrusion head and a fourth extrusion head arranged at intervals along the axial direction of the transfer roller, the third extrusion head and the fourth extrusion head respectively contacting the edge of the active material area on the second side.

17. A battery winding device, characterized in that, include: The fluorescent coating apparatus according to any one of claims 10 to 16, wherein the fluorescent coating apparatus is configured to coat the fluorescent agent onto the edge of the active material region of the battery electrode; The detection light source is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode; An image acquisition device is configured to acquire fluorescence detection images of the edges of the active material regions of the battery electrode. The processing unit is configured to identify the fluorescence detection image and determine the winding state of the battery.

18. The battery winding apparatus according to claim 17, characterized in that, The battery winding device further includes a winding assembly, which includes a winding needle and a conveying assembly, the conveying assembly being configured to wind the battery electrode onto the surface of the winding needle; the detection light source includes a first light source group and a second light source group. The first light source group is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode located at the first end of the coil needle; The second light source group is configured to provide a fluorescent laser light source projected onto the edge of the active material region of the battery electrode located at the second end of the coil needle; wherein the first end and the second end are respectively located at both ends of the coil needle along the width direction of the electrode assembly.

19. The battery winding apparatus according to claim 18, characterized in that, The battery electrode includes a first electrode and a second electrode, and the image acquisition device includes a first imaging unit and a second imaging unit. The first imaging unit is configured to acquire a first fluorescence detection image, the first fluorescence detection image including at least a first electrode wrapped around a first end of the needle and a second electrode not yet wrapped around the first end of the needle; The second imaging unit is configured to acquire a second fluorescence detection image, the second fluorescence detection image including at least a portion of the first electrode wrapped around the second end of the needle and the second electrode not yet wrapped around the second end of the needle.

20. A single battery cell, characterized in that, include: An electrode assembly comprising a battery electrode sheet, wherein the edge of the active material region of the battery electrode sheet has a fluorescent material, and the battery electrode sheet is coated with a fluorescent coating method as described in any one of claims 1 to 6.

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