Roll changing device and battery production plant

Abstract

This application relates to a winding device and battery production equipment, and is applied in the field of battery production technology. One aspect of the winding device includes: a winding module for winding electrode sheets to form an electrode sheet roll; an unwinding module for unwinding the electrode sheet roll; an identification module disposed on the unwinding path of the unwinding module for identifying preset marks on the electrode sheets; and a control module communicatively connected to the identification module, which can control the unwinding module to stop or continue unwinding based on the identification status of the preset marks. The winding device of this application can improve unwinding efficiency.

Description

Technical Field

[0001] This application relates to the technical field of battery production, and in particular to a rewinding device and battery production equipment. Background Technology

[0002] The production process of lithium battery electrode sheets includes coating, rolling, slitting, sheet making, and tab forming. Between coating, rolling, and slitting processes, after the current process is completed, the electrode sheets need to be rolled into electrode rolls, and then the electrode rolls are transferred to the next process for unwinding.

[0003] In the existing technology, the winding device monitors the diameter of the electrode roll using an ultrasonic sensor during the unwinding process. When the roll diameter reaches the set value, the machine automatically stops, and then the roll is manually changed. However, the ultrasonic detection of the roll diameter has a certain degree of fluctuation, which leads to problems such as the material strip carrying the electrode roll running empty without stopping or a large amount of tail material when the machine stops, resulting in a large amount of scrap during the roll change. As a result, the unwinding efficiency of the winding device is low. Utility Model Content

[0004] Therefore, it is necessary to provide a winding device and battery production equipment that can improve unwinding efficiency, addressing the problems in the existing technology.

[0005] Firstly, this application provides a roll changing device, which adopts the following technical solution:

[0006] A roll changing device, comprising:

[0007] The winding module is used to wind up the electrode sheets to form electrode sheet rolls;

[0008] The unwinding module is used to unwind the electrode sheet rolls;

[0009] An identification module, positioned along the unwinding path of the unwinding module, is used to identify preset marks on the electrode; and

[0010] The control module communicates with the recognition module and can control the unwinding module to stop or continue unwinding based on the recognition status of the preset marks.

[0011] In one embodiment, the winding device further includes a labeling module, which is disposed on the winding path of the winding module for adding preset marks to the electrode.

[0012] In one embodiment, the labeling module includes:

[0013] A position marking unit is used to add position marks at preset positions on the electrode.

[0014] The defect marking unit is used to add defect marks at the defect locations of the electrode sheet based on the defect detection results of the current process.

[0015] Preset markers include location markers and / or defect markers.

[0016] In one embodiment, the identification module includes:

[0017] Location identification unit, used to identify location markers;

[0018] The defect identification unit, located adjacent to the location identification unit, is used to identify defect marks.

[0019] In one embodiment, the location marker is a shape marker or a color marker, and the defect marker is a shape marker or a color marker; the shape of the location marker is different from the shape of the defect marker, and / or the color of the location marker is different from the color of the defect marker.

[0020] In one embodiment, the location identification unit is a color mark or a photoelectric sensor, and the defect identification unit is a color mark or a photoelectric sensor.

[0021] In one embodiment, the preset position is located at the core of the electrode roll, and / or the preset position is the preset cutting position of the electrode.

[0022] Secondly, this application provides a battery production apparatus, including the roll changing device as described in the first aspect.

[0023] In the aforementioned winding device and battery production equipment, as the winding module winds the electrode sheets into an electrode roll, a preset mark on the electrode sheet is wound inside the electrode roll and unwound during the unwinding process. If the identification module recognizes the mark, it indicates that the unwound electrode sheet has moved to the set position and can be transferred to the next process. If the identification module does not recognize the mark, it indicates that the unwinding is not yet complete, and the unwinding module continues to work, avoiding premature shutdown that would result in excessive tail material and material waste. Thus, the winding device in this embodiment can accurately and effectively control the unwinding process of the electrode sheets, preventing the strip from running empty and reducing the number of rolls scrapped, thereby effectively improving unwinding efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the winding structure of a winding device in one embodiment;

[0025] Figure 2 This is a schematic diagram of the unwinding structure of a winding device in one embodiment.

[0026] Attached image annotations:

[0027] 1. Electrode; 2. Labeling module; 3. Rewinding module; 41. Winding machine; 42. Unwinding strip; 5. Position recognition unit; 6. Defect recognition unit; 7. Needle collection module; 8. Conveyor belt. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] The following is in conjunction with the appendix Figure 1-2 The embodiments of this application will be described in further detail.

[0035] Figure 1 A schematic diagram of the winding structure of a winding device according to an embodiment of this application is shown; Figure 2 A schematic diagram of the unwinding structure of a winding device according to an embodiment of this application is shown. (See also...) Figure 1 and Figure 2 An embodiment of this application provides a rewinding device, comprising: a winding module 3 for winding the electrode sheet 1 to form an electrode sheet roll; an unwinding module for unwinding the electrode sheet roll; an identification module disposed on the unwinding path of the unwinding module for identifying a preset mark on the electrode sheet 1; and a control module communicatively connected to the identification module, wherein the control module can control the unwinding module to stop or continue unwinding according to the identification status of the preset mark.

[0036] The roll changing device can be located between the output end of the current process and the input end of the next process.

[0037] For example, the current process can be a coating process in lithium battery production, and the next process can be a rolling process. In the current process, the positive and negative electrode slurries are uniformly coated on the metal foil, dried, and then coated electrode sheet 1 is obtained. After the coating process is completed, electrode sheet 1 needs to be rolled into an electrode roll, and then the electrode roll is transferred to the unwinding module to be unwound and restored to electrode sheet 1, and then enters the equipment corresponding to the next process for rolling. For another example, the current process can be a rolling process, and the next process can be a slitting process.

[0038] In one possible implementation, the roll changing device further includes a labeling module 2, which is disposed on the winding path of the winding module 3 for the electrode 1, and is used to add a preset mark to the electrode 1.

[0039] In one possible implementation, the labeling module 2 includes: a position marking unit for adding a position mark at a preset position of the electrode 1; and a defect marking unit for adding a defect mark at a defect position of the electrode 1 according to the defect detection status of the current process; the preset marks include position marks and / or defect marks.

[0040] In this process, a conveyor belt 8 is provided, connected to the winding module 3, and extends along the winding path of the electrode sheet. A position marking unit can be fixedly installed on the top of the conveyor belt 8, adding a position mark at the beginning or a specific position of each electrode sheet 1 output from the current process. For example, the position mark can be added to the core at the beginning end of the electrode sheet 1, and is wound into the inner ring during the winding process and unwound at the end of the unwinding stage, allowing the identification module to recognize and determine the unwinding status of the electrode sheet 1.

[0041] In one possible implementation, a defect detection area is set up after the operation steps in the current process are completed. The defect detection area can be equipped with an industrial vision system, including a line scan or area scan camera and a high-brightness LED light source. When the electrode 1 on the conveyor belt 8 passes through the defect detection area, the vision system captures images in real time and identifies defects such as burrs, missing corners, dimensional abnormalities, indentations, and dirt on the surface of the electrode 1 through image processing algorithms. The vision system is set with multiple defect types and corresponding defect judgment thresholds. When the electrode 1 has a defect that exceeds the judgment threshold, the vision system will identify the location of the defect and generate a corresponding marking signal. Then, the marking signal is used to control the defect marking unit to add a defect mark at the defect location.

[0042] For example, the labeling module 2 may include a labeling tape, a peeling mechanism, and a driving mechanism. The labels are typically stored in a roll on the labeling tape before being applied. The labeling head of the peeling mechanism separates the backing paper from the label and adds the label to the target location. A labeling signal controls the peeling mechanism to peel the label from the labeling tape at a set time and add it to the electrode 1, thereby marking a specific location or defect location on the electrode 1.

[0043] The driving mechanism can be a cylinder controlled by a solenoid valve or a servo motor; the labeling head of the peeling mechanism can be a rotary labeling head, a translational labeling head, or a robotic arm labeling head. The rotary labeling head rotates along a certain arc under the drive of the driving mechanism to add the label; the translational labeling head moves back and forth on a fixed track, delivering the label to the surface of the electrode 1, where a pressing mechanism completes the label pressing; the robotic arm labeling head can work with a vision positioning system to identify the position of the electrode 1 and then perform automatic labeling operations at multiple angles and multiple label positions. The labeling mechanism can add labels using hot melt adhesive, electrostatic adsorption, automatic pressing, etc.

[0044] Optionally, the defect marking units can be positioned at a preset distance after the defect detection area to ensure that marking can be successfully applied when the defect location precisely passes the labeling point of the defect marking unit. Optionally, the position marking units in the labeling module 2 can be positioned adjacent to the defect marking units or at a preset distance apart; the position marking units and defect marking units can be integrated into one device or can be two independent devices.

[0045] Correspondingly, the identification module includes: a location identification unit 5, used to identify location markers; and a defect identification unit 6, which is arranged adjacent to the location identification unit 5 and used to identify defect markers.

[0046] In one possible implementation, the location marker is a shape marker or a color marker, and the defect marker is a shape marker or a color marker; the shape of the location marker is different from the shape of the defect marker, and / or the color of the location marker is different from the color of the defect marker.

[0047] In one possible implementation, the location identification unit is a color mark or a photoelectric sensor, and the defect identification unit is a color mark or a photoelectric sensor.

[0048] In one possible implementation, the preset position is located at the core of the electrode roll, and / or the preset position is the preset cutting position of the electrode.

[0049] The color markings can be specific colors that distinguish them from electrode 1, such as red for position markings and yellow for defect markings, showing a significant color difference from electrode 1. Shape markings can be easily identifiable and affixed, such as triangles or circles. Correspondingly, the position recognition unit 5 and defect recognition unit 6 can be color marks or photoelectric sensors, utilizing the principle of photoelectric reflection to identify instantaneous changes in the color or shape of the electrode 1 surface.

[0050] The color mark sensor continuously emits a light beam onto the surface of electrode 1 and receives the reflected light. It detects the intensity and color change of the reflected light in real time to detect the color change on the surface of electrode 1. When a color change is detected, the reflection characteristics change abruptly, and the sensor immediately outputs a high-level or low-level signal to indicate that the detection result is that a mark has been detected.

[0051] Photoelectric sensors convert light intensity changes into electrical signals. By reading and analyzing changes in electrical signals, the shape of the marker is determined. For example, if the electrical signal shows characteristics of long-term occlusion, it may be a rectangular marker; if the occlusion signal shows sharp changes, it may be a triangular marker; if the occlusion time is short and the curve is smooth, it may be a circular marker.

[0052] Optionally, the marking can also be a barcode, QR code, or RFID (Radio Frequency Identification) tag, and the identification module corresponds to a barcode, QR code, or RFID identification device.

[0053] In this embodiment, the defect marking unit can accurately mark the defective segments of the electrode 1, which are then used by the defect identification unit 6 for defect identification. This facilitates the identification and removal of defects by operators, thereby enabling the identification and processing of defective segments and effectively improving the product yield in the battery production process.

[0054] The control module is connected to the identification module. When a mark is detected, the identification module can send a stop command to the control module to indicate that the unwinding is finished. The control module is also connected to the unwinding module to control the unwinding module to stop and prompt manual or automatic replacement of the new roll.

[0055] The rewinding device provided in this embodiment uses a labeling device to add a mark to the electrode sheet 1. As the winding module 3 winds the electrode sheet 1 into an electrode sheet roll, the mark is wound onto the core of the electrode sheet roll and / or wound onto the preset cutting position of the electrode sheet. It is then unwound during the unwinding process of the unwinding module. If the identification module recognizes the mark, it indicates that the unwound electrode sheet 1 has moved to the set position and can proceed to the next process. If the identification module does not recognize the mark, it indicates that unwinding is not yet complete, and the unwinding module continues to work, avoiding premature shutdown that would result in excessive tail material and material waste. Thus, the rewinding device in this embodiment can accurately and effectively control the unwinding process of the electrode sheet 1, preventing the strip from running empty and reducing rewinding waste, thereby effectively improving unwinding efficiency.

[0056] In an exemplary embodiment, the winding module 3 may include a winding needle and a winding support structure. The winding needle may be sleeved or clamped on the winding support structure. Before winding the electrode 1, the winding support structure fixes the winding needle. After the end of the electrode 1 contacts the winding needle, the winding support structure drives the winding needle to rotate, thereby winding the electrode 1 around the outside of the winding needle to form an electrode roll.

[0057] For example, the winding needle can be made of disposable material or a reusable metal structure. Disposable winding needles can be paper tubes or plastic tubes, while metal winding needles can be made of steel or aluminum alloy. The winding needle is equipped with a positioning groove, a guide groove, or an air-expansion structure to facilitate a tight fit with the winding support structure or the unwinding support structure in the unwinding module, preventing slippage.

[0058] For example, the winding support structure can adopt an air-expanding shaft or a mechanical clamping shaft structure, which has the functions of quick clamping, expansion and fixation, and automatic release. It can also quickly release the winding needle after winding is completed, so that the electrode roll can be removed and the winding needle replaced for winding the next electrode 1. Taking an air-expanding shaft as an example, the winding support structure fixes the winding needle through an internal expansion mechanism to prevent it from slipping during rotation. When the end of the electrode 1 contacts the winding needle, a clamping device such as a vacuum suction plate or mechanical grippers can fix the front end of the electrode 1 onto the winding needle. At the same time, the winding support structure drives the winding needle to rotate slowly, causing the electrode 1 to begin winding.

[0059] Optionally, the winding module 3 also includes a controller, which matches the speed at which the conveyor belt 8 conveys the electrode 1 according to the tension data of the electrode 1 during the winding process, so as to avoid "conical winding" or "snake-like edge" caused by inertia or tension imbalance.

[0060] Optionally, the winding module 3 also includes an end detection device for identifying the tail end of the electrode 1 so that the machine can slow down and automatically stop when winding is near completion. The winding support structure releases the winding needle and guides the operator to unload the electrode material roll formed by the winding needle and the electrode 1 wound around the winding needle, and switch to the next winding needle.

[0061] In one possible implementation, the input end of the winding module 3 is arranged in a horizontal direction, and when the electrode 1 enters the winding module 3, it is arranged at an angle to the input end of the winding module 3.

[0062] In this process, the electrode sheet 1, after being marked by the labeling module 2, is conveyed along the conveyor belt 8 to the winding module 3, such as... Figure 1 As shown, when electrode 1 enters the winding module 3, the angle between it and the input end of the winding module 3 is greater than 90°. It enters the winding module 3 at an angle with a downward slope, and uses gravity to naturally attach electrode 1 to the conveyor belt 8, reducing gaps and improving the adhesion and flatness of electrode 1. A horizontal conveyor section is set before the entrance of the winding device, which is conducive to the precise positioning of the left and right edges of electrode 1, so that electrode 1 keeps coaxial and at the same height when it contacts the winding needle, improving the initial bonding stability. This allows the winding device to stably and neatly wind electrode 1 into a tightly structured, uniformly tensioned, and edge-aligned electrode roll, avoiding warping or bending, wrinkles or local bulges, and problems such as uneven stacking and internal stress accumulation.

[0063] In an exemplary embodiment, the unwinding module includes: a winding machine 41 for unwinding the electrode roll; and an unwinding strip 42 connected to the output end of the winding machine 41 for transmitting the unwound electrode 1 and the winding needle.

[0064] The winding machine 41 includes an unwinding support structure for fixing the winding needles of the electrode roll. The unwinding support structure is similar to the winding support structure and can be either an air-expanding shaft or a mechanical clamping shaft. During the unwinding process, the winding machine 41 can adjust its rotation speed according to the diameter of the electrode roll to achieve unwinding.

[0065] Optionally, the winding machine 41 may include a tension control structure to dynamically adjust the unwinding support structure and the rotational speed of the unwinding strip 42 based on the tension data of the electrode roll, thereby maintaining a stable output tension. The unwinding strip 42 extends along the unwinding path of the electrode 1.

[0066] In this embodiment, the winding machine 41 in the unwinding module unwinds the electrode roll, and the unwound electrode 1 is conveyed by the unwinding belt 42. The mark added on the electrode 1 is exposed and moves with the unwinding belt 42 until it is recognized by the identification module and a mark signal is generated.

[0067] For example, during the unwinding process of the winding machine 41, a position marker signal sent by the identification module is received, indicating that the marked position of the electrode 1 has been identified by the identification module, the electrode 1 has been conveyed to the preset position and unwinding is completed, and the winding machine 41 in the module can stop rotating based on the unwinding status of the electrode 1 and unload the winding needle so that the operator can add the next electrode roll to the winding machine 41 for unwinding. As another example, during the unwinding process of the winding machine 41, a defect marker signal is received, indicating that the defect position of the electrode 1 has been identified by the identification module, the electrode 1 has been conveyed to the preset position, and the winding machine 41 and / or the unwinding strip 42 in the module can stop rotating based on the defect status of the electrode 1 and unload the winding needle so that the operator can pick out the defective electrode 1 or remove the defect in time, improving the yield of the electrode 1 entering the next process.

[0068] In one possible implementation, the winding device further includes a winding needle collection module 7, which is disposed at the end of the unwinding strip 42.

[0069] If the winding needle is a single-use material, it will be discarded or collected in a centralized manner; if it is a reusable rigid core tube, it also needs to be inspected and sorted for recycling, waiting to be reused when the next batch of electrode 1 is wound. After being unwound by the unwinding module, the electrode 1 enters the equipment corresponding to the next process for operation, and the winding needle continues to move along the unwinding material belt 42 until it enters the winding needle collection module 7.

[0070] In one possible implementation, such as Figure 2As shown, a ramp is provided between the needle collection module 7 and the unwinding belt 42. The needles slide towards the needle collection module 7 through the ramp at the end of the unwinding belt 42, which can quickly and efficiently recover the needles.

[0071] In one exemplary embodiment, the rewinding device has at least two identification modules, which are distributed on both sides of the unwinding strip 42.

[0072] During the unwinding process of the electrode roll, problems such as lateral deviation, slight shaking, or label misalignment may occur. By distributing the identification modules on both sides of the unwinding strip 42, multiple identification modules can identify simultaneously, enabling simultaneous detection and identification of the markings on both sides of the electrode 1. This can effectively expand the identification area and improve the identification accuracy.

[0073] Optionally, the identification modules on both sides of the unwinding tape 42 can have one side as the main identification module and the other side as a backup identification module, automatically switching to the backup module when the main identification module fails. Alternatively, both sides must be identified simultaneously to trigger a stop or roll change, preventing misjudgment on one side.

[0074] In one possible implementation, the orientation of each identification module is perpendicular to the extension direction of the unwound strip 42. For example... Figure 1 As shown, the two position recognition units 5 in the recognition module are set perpendicular to the extension direction of the unwinding strip 42; the two defect recognition units 6 are set perpendicular to the extension direction of the unwinding strip 42. In this way, the recognition units in the recognition module work together to form a complete and clear recognition field of view, avoid missing marks, and improve recognition accuracy.

[0075] Combination Figure 1 and Figure 2 As shown, one embodiment of this application provides a roll changing device including:

[0076] Labeling module 2, located on the winding path of the winding module for the electrode sheet, is used to add preset marks to the electrode sheet. Labeling module 2 includes: a position marking unit for adding position marks at preset positions on the electrode sheet 1; and a defect marking unit for adding defect marks at defect positions on the electrode sheet 1 based on the defect detection results of the current process. The preset marks include position marks and / or defect marks. The preset positions are located at the core of the electrode roll, and / or the preset positions are the preset cutting positions of the electrode sheet.

[0077] The winding module 3 is used to wind up the electrode sheet 1 to form an electrode sheet roll. The input end of the winding module 3 is set in the horizontal direction, and when the electrode sheet 1 enters the winding module 3, it is set at an angle to the input end of the winding module 3.

[0078] The unwinding module is used to unwind the electrode roll; the unwinding module includes: a winding machine 41, used to unwind the electrode roll; and an unwinding strip 42, connected to the output end of the winding machine 41, used to transport the unwound electrode 1.

[0079] An identification module, positioned along the unwinding path of the electrode sheet by the unwinding module, is used to identify preset marks on the electrode sheet. The identification module includes: a position identification unit 5 for identifying position marks; and a defect identification unit 6, adjacent to the position identification unit 5, for identifying defect marks. At least two identification modules are distributed on both sides of the unwinding strip 42. The orientation of each identification module is perpendicular to the extension direction of the unwinding strip 42. Position marks are either shape marks or color marks, and defect marks are either shape marks or color marks; the shape of the position mark differs from the shape of the defect mark, and / or, the color of the position mark differs from the color of the defect mark. The position identification unit is a color mark or a photoelectric sensor, and the defect identification unit is a color mark or a photoelectric sensor.

[0080] The control module communicates with the recognition module and can control the unwinding module to stop or continue unwinding based on the recognition status of the preset marks.

[0081] In one exemplary embodiment, a battery production apparatus is provided, including the roll changing device described in the above embodiment.

[0082] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0083] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A roll changing device, characterized in that, The roll changing device includes: The winding module is used to wind up the electrode sheets to form electrode sheet rolls; An unwinding module is used to unwind the electrode sheet roll; An identification module, disposed along the unwinding path of the unwinding module for the electrode sheet, is used to identify preset marks on the electrode sheet; and The control module is communicatively connected to the identification module, and the control module can control the unwinding module to stop or continue unwinding according to the identification status of the preset mark.

2. The roll changing device according to claim 1, characterized in that, The winding device further includes a labeling module, which is disposed on the winding path of the winding module for adding the preset mark to the electrode.

3. The roll changing device according to claim 2, characterized in that, The labeling module includes: A position marking unit is used to add a position mark at a preset position on the electrode; The defect marking unit is used to add defect marks to the defect locations of the electrode sheet according to the defect detection results of the current process. The preset markers include the location markers and / or the defect markers.

4. The roll changing device according to claim 3, characterized in that, The identification module includes: A location identification unit, used to identify the location marker; A defect identification unit is disposed adjacent to the location identification unit and is used to identify the defect mark.

5. The roll changing device according to claim 4, characterized in that, The location marker is a shape marker or a color marker, and the defect marker is a shape marker or a color marker; the shape of the location marker is different from the shape of the defect marker, and / or the color of the location marker is different from the color of the defect marker.

6. The roll changing device according to claim 4, characterized in that, The location identification unit is a color mark or a photoelectric sensor, and the defect identification unit is a color mark or a photoelectric sensor.

7. The roll changing device according to claim 3, characterized in that, The preset position is located at the core of the electrode roll, and / or the preset position is the preset cutting position of the electrode.

8. The roll changing device according to claim 1, characterized in that, Also includes: A conveyor belt is connected to the winding module, and the conveyor belt extends along the winding path of the electrode sheet.

9. The roll changing device according to claim 1, characterized in that, At least two identification modules are distributed on both sides of the unwinding path of the electrode sheet.

10. A battery manufacturing apparatus, characterized in that, Includes the roll changing device as described in any one of claims 1-9.

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