Pole piece winding device and pole piece defect detection system

Abstract

The utility model relates to a pole piece winding device and a pole piece defect detection system, the pole piece winding device comprises a substrate, a winding needle, a pole piece roll-in correction assembly and an image acquisition assembly, the winding needle is connected with the substrate, and the winding needle is used for winding a negative pole piece, a first diaphragm, a positive pole piece and a second diaphragm which are stacked in sequence; the pole piece rolling deviation rectifying assembly is connected with the substrate and is used for adjusting the position of the negative pole piece and / or the position of the positive pole piece; the image acquisition assembly is connected with the substrate and comprises a first camera and a second camera which are arranged on the same side, the first camera is used for shooting images around the winding needle, and the second camera is used for shooting images of the negative pole piece. According to the utility model, the pole piece image can be acquired in real time in the winding process of the pole piece, and defect detection can be carried out according to the pole piece image, so that the defects of the pole piece in the battery cell can be effectively detected on the premise that the battery cell is not disassembled.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of battery production, and particularly relates to a pole piece winding device and a pole piece defect detection system having the pole piece winding device. Background Art

[0002] With the rapid development of energy storage battery technology, the capacity of single cells has been significantly improved, and the quality requirements of batteries need to be increased to ensure battery safety. Major companies usually adopt the winding process to produce bare battery cores for assembling batteries. During the pole piece winding process, multiple levels of rectification (such as unwinding rectification, process rectification, winding-in rectification, etc.) are required from unwinding to the winding needle winding and forming to ensure the accurate alignment of the pole pieces. During the last level of rectification above the winding needle, the negative pole piece is more likely to have defects such as wrinkles or scratches. These defects not only affect the performance of the battery but may also pose a threat to the safety of the battery.

[0003] During the pole piece defect detection process of the finished battery core, the existing method is to manually check the inner circle and the outer appearance tail of the battery core at regular intervals. This method may cause the defects of the pole pieces in the middle of the battery core to not be detected in time, and the alignment degree of the pole pieces and the separator cannot be guaranteed. If you want to observe the state of the pole pieces inside the battery core, destructive disassembly of the battery core is required, and once the battery core is disassembled, the battery core will be scrapped. Currently, without disassembling the battery core, the defects of the pole pieces inside the battery core cannot be effectively detected. Summary of the Utility Model

[0004] The technical problem to be solved by this application is to provide a pole piece winding device and a pole piece defect detection system, which can obtain the pole piece image in real time during the pole piece winding process and perform defect detection based on the pole piece image, so that the defects of the pole pieces inside the battery core can be effectively detected without disassembling the battery core.

[0005] The technical solution adopted by this application to solve the above technical problem is a pole piece winding device, including a substrate, a winding needle, a pole piece winding-in rectification component, and an image acquisition component. Among them, the winding needle is connected to the substrate, and the winding needle is used to wind the negative pole piece, the first separator, the positive pole piece, and the second separator stacked in sequence; the pole piece winding-in rectification component is connected to the substrate, and the pole piece winding-in rectification component is used to adjust the position of the negative pole piece and / or the position of the positive pole piece; the image acquisition component is connected to the substrate, and the image acquisition component includes a first camera and a second camera arranged on the same side. The first camera is used to capture the image around the winding needle, and the second camera is used to capture the image of the negative pole piece.

[0006] In an embodiment of this application, the image acquisition component further includes a moving component, and the moving component is connected to the first camera and / or the second camera, and the moving component is used to control the movement of the first camera and / or the second camera.

[0007] In an embodiment of the present application, the moving component includes a moving drive motor, a lead screw, and a connecting member. The moving drive motor is connected to the lead screw. One side of the connecting member is sleeved on the lead screw, and the other side of the connecting member is connected to the first camera and / or the second camera. The moving drive motor is used to drive the lead screw to rotate so as to drive the connecting member to move.

[0008] In an embodiment of the present application, the image acquisition component further includes an illumination part, a bracket base, and a bracket connecting member. The bracket base is connected to the substrate. The illumination part is movably connected to the bracket base through the bracket connecting member. The illumination part is used to provide illumination for the first camera and / or the second camera.

[0009] In an embodiment of the present application, the illumination part is rectangular, and the width of the illumination part is greater than or equal to the width of the winding needle.

[0010] In an embodiment of the present application, the second camera is arranged facing the negative electrode plate. There is an included angle a between the center line of the lens of the second camera and the surface of the negative electrode plate. The range of the included angle a satisfies: 60° ≤ a ≤ 120°.

[0011] In an embodiment of the present application, the first camera is arranged facing the winding needle, and the center line of the lens of the first camera is aligned with the center point of the winding needle.

[0012] In an embodiment of the present application, the pole piece feeding and winding deviation rectifying component includes a first deviation rectifying bracket, a second deviation rectifying bracket, a deviation rectifying drive motor, a first deviation rectifying roller, and a second deviation rectifying roller. The first deviation rectifying bracket is connected to the substrate. The second deviation rectifying bracket is slidably connected to the first deviation rectifying bracket. The second deviation rectifying bracket is also respectively connected to the first deviation rectifying roller and the second deviation rectifying roller. The first deviation rectifying roller and the second deviation rectifying roller are arranged side by side. The negative electrode plate and / or the positive electrode plate can pass through the gap between the first deviation rectifying roller and the second deviation rectifying roller. The deviation rectifying drive motor is connected to the first deviation rectifying roller. The deviation rectifying drive motor is used to drive the first deviation rectifying roller to roll so as to drive the negative electrode plate and / or the positive electrode plate to move.

[0013] In an embodiment of the present application, the pole piece feeding and winding deviation rectifying component further includes a deviation rectifying roller bracket and a deviation rectifying roller sliding member. The deviation rectifying roller bracket is respectively connected to the deviation rectifying roller sliding member and the second deviation rectifying roller. A slide rail is arranged on the deviation rectifying roller sliding member, and a guide rail is arranged on the second deviation rectifying bracket. The deviation rectifying roller sliding member and the second deviation rectifying bracket are slidably connected through the slide rail and the guide rail.

[0014] In an embodiment of the present application, the pole piece winding device further includes a film combining roller assembly. The film combining roller assembly is connected to the substrate. The film combining roller assembly includes a film combining roller drive motor and a film combining roller supporting part. The film combining roller drive motor is connected to the film combining roller supporting part. The film combining roller supporting part is connected to the first separator and / or the second separator. The film combining roller drive motor is used to drive the film combining roller supporting part to move so as to drive the first separator and / or the second separator to move.

[0015] To solve the above technical problems, the present application also provides a pole piece defect detection system, including the above-mentioned pole piece winding device and a processor, which is used to detect defects of the negative pole piece and / or the positive pole piece according to the images captured by the image acquisition component.

[0016] Through the technical solution of the present application, by setting the pole piece in-roll deviation correction component, the position of the pole piece can be adjusted during the pole piece winding process to ensure the accuracy of the wound pole piece; by setting the image acquisition component, the first camera and the second camera can capture pole piece images from multiple perspectives during the pole piece winding process, and the defects and flaws of the negative pole piece and the positive pole piece can be detected in real time according to the pole piece images. The technical solution of the present application can monitor the entire pole piece winding process. For the film surface state of the pole piece before and after passing through the last-stage deviation correction and before entering the winding needle, the present application can timely capture the images of the pole piece state, which is convenient for detecting pole piece defects according to the pole piece images, thereby preventing defective battery cells from flowing out of the production line and improving the overall quality and safety performance of the battery cells. Description of the Drawings

[0017] To make the above objects, features, and advantages of the present application more obvious and understandable, the following detailed description of the specific embodiments of the present application is provided in conjunction with the accompanying drawings, where:

[0018] Figure 1 is the overall structural schematic diagram of the pole piece winding device according to an embodiment of the present application;

[0019] Figure 2 is the structural schematic diagram of the pole piece in-roll deviation correction component according to an embodiment of the present application;

[0020] Figure 3 is the structural schematic diagram of the image acquisition component according to an embodiment of the present application;

[0021] Figure 4 is the schematic diagram of the positional relationship between the second camera and the negative pole piece during the pole piece winding process according to an embodiment of the present application;

[0022] Figure 5 is the schematic diagram of the field of view area captured by the second camera during the pole piece winding process according to an embodiment of the present application;

[0023] Figure 6 is the schematic diagram of the positional relationship between the first camera and the winding needle during the pole piece winding process according to an embodiment of the present application;

[0024] Figure 7 is the schematic diagram of the field of view area captured by the first camera during the pole piece winding process according to an embodiment of the present application;

[0025] Figure 8 is the schematic diagram of the positional relationship between the first camera and the second camera when starting to wind the pole piece according to an embodiment of the present application;

[0026] Figure 9 It is a schematic diagram of the positional relationship between the first camera and the second camera when winding the end of the winding pole piece in an embodiment of the present application;

[0027] Figure 10 It is a schematic diagram when the negative pole piece is fed in an embodiment of the present application;

[0028] Figure 11 It is a schematic diagram when the cutting of the negative pole piece ends in an embodiment of the present application;

[0029] Figure 12 It is a schematic diagram when the positive pole piece is fed in an embodiment of the present application;

[0030] Figure 13 It is a schematic diagram when the cutting of the positive pole piece ends in an embodiment of the present application;

[0031] Figure 14 It is a schematic diagram of the pole piece defect detection system in an embodiment of the present application;

[0032] Figure 15 It is a schematic diagram of the pole piece image taken by the second camera in an embodiment of the present application;

[0033] Figure 16 It is a schematic diagram of the pole piece image taken by the first camera in an embodiment of the present application;

[0034] Figure 17 It is a flowchart of defect detection during the pole piece winding process in an embodiment of the present application;

[0035] Figure 18 It is a schematic diagram of cross shooting between the first camera and the second camera in an embodiment of the present application;

[0036] Figure 19 It is a schematic diagram of parallel shooting between the first camera and the second camera in an embodiment of the present application;

[0037] Figure 20 It is a schematic diagram when two first cameras are set in an embodiment of the present application.

[0038] Explanation of the reference numerals in the specific implementation manner:

[0039] 1. Substrate; 100. Electrode winding device; 12. Second camera; 121. Lens center line of the second camera; 14. Negative electrode; 145. Electrode feeding and winding deviation correction assembly; 15. First separator; 16. Positive electrode; 17. Second separator; 2. Turret; 3. Winding needle; 31. Center point of the winding needle; 41. Deviation correction drive motor; 42. First deviation correction roller; 43. Second deviation correction roller; 44. Deviation correction roller bracket; 45. Second deviation correction bracket; 451. Guide rail; 46. Deviation correction roller slider; 47. First deviation correction bracket; 6. Film combining roller assembly; 61. Film combining roller drive motor; 7. Film combining roller support; 801. Moving drive motor; 802. Lead screw; 811. Image acquisition assembly; 81111. Moving assembly; 82112. Connecting piece; 9. First camera; 91. Lens center line of the first camera; 101131. Bracket base; 102132. Bracket connecting piece; 103133. Lighting part; 1600. Electrode defect detection system; 1610. Processor; L1. Width of the lighting part; L2. Width of the winding needle. Detailed implementation manners

[0040] To make the above objects, features and advantages of the present application more obvious and understandable, the following detailed description of the specific implementation manners of the present application is provided in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a thorough understanding of the present application. However, the present application may be implemented in other ways different from those described herein, and thus the present application is not limited by the specific embodiments disclosed below.

[0042] As shown in the present application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0043] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be understood as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0046] Hereinafter, embodiments of the present application will be described based on the accompanying drawings. However, the embodiments shown below are illustrations of a pole piece winding device and a pole piece defect detection system for embodying the technical idea of ​​the present application, and the pole piece winding device and the pole piece defect detection system of the present application are not specific to the following contents. Furthermore, in order to facilitate the understanding of the scope of the claims, this specification assigns numbers corresponding to the components shown in the embodiments to the components shown in the "Claims" and "Application Contents" columns. However, the components shown in the claims are by no means specified as the components of the embodiments. In particular, the size, material, shape, and relative configuration of the constituent components recorded in the embodiments, if there is no specific record, is not intended to limit the scope of the present application to only this, but is only an illustrative example.

[0047] However, the dimensions or positional relationships of the components shown in the respective drawings are sometimes exaggerated for clarity. Further, in the following description, for the same names and symbols, the same or homogeneous components are appropriately described in detail. Further, each element constituting the present application may be configured such that a plurality of elements are constituted by the same component, and thus one component may be used in multiple elements. Conversely, the function of one component may be realized by sharing the function among a plurality of components. In addition, the content described in a part of the embodiments and implementation manners can also be used in other embodiments, implementation manners, etc. In addition, in this specification, "above" is not limited to the case where it is formed in contact with the upper surface, but also includes the case where it is formed separately above, and is also used in the sense that an intervening layer exists between layers.

[0048] The present application provides a pole piece winding device and a pole piece defect detection system, which can be applied to scenarios where it is necessary to detect whether defects such as wrinkles or scratches occur on the pole piece during the high-speed winding process of the pole piece.

[0049] Figure 1 It is a schematic diagram of the overall structure of the pole piece winding device according to an embodiment of the present application. Refer to Figure 1 As shown, the pole piece winding device 100 of this embodiment includes: a substrate 1, a winding needle 3, a pole piece feeding and winding deviation correction assembly 145, and an image acquisition assembly 811. Among them, the winding needle 3 is connected to the substrate 1, and the winding needle 3 is used for winding the sequentially stacked negative pole piece 14, the first separator 15, the positive pole piece 16, and the second separator 17; the pole piece feeding and winding deviation correction assembly 145 is connected to the substrate 1, and the pole piece feeding and winding deviation correction assembly 145 is used to adjust the position of the negative pole piece 14 and / or the position of the positive pole piece 16; the image acquisition assembly 811 is connected to the substrate 1, and the image acquisition assembly 811 includes a first camera 9 and a second camera 12 arranged on the same side. The first camera 9 is used to capture images around the winding needle 3, and the second camera 12 is used to capture images of the negative pole piece 14.

[0050] Exemplarily, Figure 1 The approximate range of the substrate 1 is marked with a dashed box in the figure, and the present application does not limit the size of the substrate 1. The pole piece winding device 100 further includes a turret 2, and the winding needle 3 is arranged on the turret 2, and the turret 2 can rotate circumferentially to adjust the position of the winding needle 3. Figure 1 In the shown embodiment, two pole piece feeding and winding deviation correction assemblies 145 are provided. Among them, the negative pole feeding and winding deviation correction assembly 4 is used to adjust the position of the negative pole piece 14, and the negative pole piece 14 can pass through the negative pole feeding and winding deviation correction assembly 4; the positive pole feeding and winding deviation correction assembly 5 is used to adjust the position of the positive pole piece 16, and the positive pole piece 16 can pass through the positive pole feeding and winding deviation correction assembly 5. In practical applications, one or more pole piece feeding and winding deviation correction assemblies can be set, and the present application does not make any restrictions.

[0051] The technical solution of the present application can adjust the position of the pole piece during the winding process of the pole piece by setting the pole piece in-roll deviation correction component 145, so as to ensure the accuracy of the wound pole piece; by setting the image acquisition component 811, the first camera 9 and the second camera 12 can capture pole piece images from multiple perspectives during the winding process of the pole piece, and the defects and flaws of the negative pole piece 14 and the positive pole piece 16 can be detected in real time according to the pole piece images. The technical solution of the present application can monitor the entire winding process of the pole piece. For the film surface state of the pole piece before and after the last-stage deviation correction and before entering the winding needle 3, the present application can timely capture the image of the pole piece state, which is convenient for detecting the pole piece defects according to the pole piece image, thereby preventing defective battery cells from flowing out of the production line and improving the overall quality and safety performance of the battery cells.

[0052] Figure 3 is a schematic structural diagram of the image acquisition component in an embodiment of the present application. Refer to Figure 3 As shown, in some embodiments, the image acquisition component 811 further includes a moving component 81111. The moving component 81111 is connected to the first camera 9 and / or the second camera 12, and the moving component 81111 is used to control the movement of the first camera 9 and / or the second camera 12. Exemplarily, Figure 3 two moving components 81111 are provided in the shown embodiment. The first moving component 81 is connected to the first camera 9, and the first moving component 81 is used to control the movement of the first camera 9; the second moving component 111 is connected to the second camera 12, and the second moving component 111 is used to control the movement of the second camera 12. The first moving component 81 and the second moving component 111 may include a servo motor and a lead screw. In practical applications, one or more moving components can be set, and the present application does not make any restrictions.

[0053] Figure 8 is a schematic diagram of the positional relationship between the first camera and the second camera when starting to wind the pole piece in an embodiment of the present application. Figure 9 is a schematic diagram of the positional relationship between the first camera and the second camera when ending the winding of the pole piece in an embodiment of the present application. Exemplarily, refer to Figure 3 、 Figure 8 、 Figure 9As shown, during the pole piece winding process, the thickness of the wound pole piece continuously increases. The moving component 81111 can be used to control the front and back movement of the first camera 9 and the second camera 12 to adjust the distances between the first camera 9, the second camera 12 and the positive pole piece 16, the negative pole piece 14, so as to capture pole piece images from different perspectives. For example: The pole piece incoming winding deviation rectifying component 145 sends the negative pole piece 14 and the positive pole piece 16 to the winding needle 3 for winding. When starting to wind the pole piece, the winding needle 3 is at the just-started position 20, the first camera 9 is at the starting shooting position 22, and the second camera 12 is at the starting shooting position 21; during the pole piece winding process, the first camera 9 can capture images of the positive pole piece 16 and the second separator 17 on the winding needle 3. As the winding at the winding needle 3 becomes thicker and thicker, the first moving component 81 can control the first camera 9 to gradually move away from the pole piece until it reaches the ending shooting position 25 of the first camera 9. Such a setting can adjust the focal length of the first camera 9 while gradually widening the shooting angle of view of the first camera 9, so that the first camera 9 can capture clearer pole piece images with an appropriate field of view.

[0054] Continue to refer to Figure 3 、 Figure 8 、 Figure 9 As shown, during the pole piece winding process, the second camera 12 can capture images of the negative pole piece 14 and the first separator 15 on the winding needle 3. As the winding at the winding needle 3 becomes thicker and thicker and the distance between the negative pole piece 14 and the second camera 12 gradually increases, the second moving component 111 can control the second camera 12 to gradually move closer to the pole piece until it reaches the ending shooting position 24 of the second camera 12. Such a setting can adjust the focal length of the second camera 12 while mainly focusing the shooting angle of view of the second camera 12 on the negative pole piece 14, so that the second camera 12 can capture clearer pole piece images with an appropriate field of view. When ending the winding of the pole piece, the winding needle 3 is at the winding ending position 23. By setting the moving component 81111 to control the movement of the first camera 9 and the second camera 12, the shooting angles of view of the first camera 9 and the second camera 12 can cover the maximum size of the entire winding needle 3 and the pole piece during the pole piece winding process, thus ensuring the effect of capturing pole piece images.

[0055] Figure 4 is a schematic diagram of the positional relationship between the second camera and the negative pole piece during the pole piece winding process in an embodiment of the present application, Figure 5 is a schematic diagram of the field of view area captured by the second camera during the pole piece winding process in an embodiment of the present application, Figure 6 is a schematic diagram of the positional relationship between the first camera and the winding needle during the pole piece winding process in an embodiment of the present application, Figure 7 is a schematic diagram of the field of view area captured by the first camera during the pole piece winding process in an embodiment of the present application. Exemplarily, refer to Figure 4 and Figure 5As shown, during the pole piece winding process, the second camera 12 can capture an image of the negative pole piece 14 on the winding needle 3. Figure 5 The dashed triangular region 18 in [reference] generally shows the shooting field of view region of the second camera 12. Figure 6 and Figure 7 As shown, during the pole piece winding process, the first camera 9 can capture an image around the winding needle 3. Figure 7 The dashed triangular region 19 in [reference] generally shows the shooting field of view region of the first camera 9.

[0056] Reference Figure 3 As shown, in some embodiments, the moving component 81111 includes a moving drive motor 801, a lead screw 802, and a connecting member 82112. The moving drive motor 801 is connected to the lead screw 802. One side of the connecting member 82112 is sleeved on the lead screw 802, and the other side of the connecting member 82112 is connected to the first camera 9 and / or the second camera 12. The moving drive motor 801 is used to drive the lead screw 802 to rotate, thereby driving the connecting member 82112 to move. Exemplarily, the moving drive motor 801 can be a servo motor, a DC motor, an AC motor, a stepper motor, etc. The first connecting member 82 in the first moving component 81 is connected to the first camera 9, and the second connecting member 112 in the second moving component 111 is connected to the second camera 12.

[0057] Continuing to refer to Figure 3 As shown, exemplarily, the working principle of the first moving component 81 is described herein as an example. When the moving drive motor 801 drives the lead screw 802 to rotate forward, it can drive the first connecting member 82 to move away from the moving drive motor 801, and the first camera 9 disposed on the first connecting member 82 also moves in the same direction; when the moving drive motor 801 drives the lead screw 802 to rotate reversely, it can drive the first connecting member 82 to move closer to the moving drive motor 801. The working principle of the second moving component 111 is similar to that of the first moving component 81, and will not be elaborated herein. In practical applications, it is possible to control only the movement of the first camera 9, or only the movement of the second camera 12, or the movement of both the first camera 9 and the second camera 12 according to needs, and the present application does not make any restrictions.

[0058] In some embodiments, the image acquisition component 811 further includes an illumination unit 103133, a bracket base 101131, and a bracket connection member 102132. The bracket base 101131 is connected to the substrate 1, and the illumination unit 103133 is movably connected to the bracket base 101131 through the bracket connection member 102132. The illumination unit 103133 is configured to provide illumination for the first camera 9 and / or the second camera 12. Exemplarily, the bracket base 101131 and the substrate 1 are fixedly connected, the illumination unit 103133 and the bracket connection member 102132 are fixedly connected, and the bracket connection member 102132 can rotate relative to the bracket base 101131 to adjust the illumination direction of the illumination unit 103133.

[0059] Figure 3 In the illustrated embodiment, two illumination units, two bracket bases, and two bracket connection members are provided. The first illumination unit 103 is movably connected to the first bracket base 101 through the first bracket connection member 102, and the first illumination unit 103 is configured to provide illumination for the first camera 9. The second illumination unit 133 is movably connected to the second bracket base 131 through the second bracket connection member 132, and the second illumination unit 133 is configured to provide illumination for the second camera 12. In practical applications, the number of illumination units, bracket bases, and bracket connection members can be set as needed, and the present application does not limit this.

[0060] Reference Figure 3 and Figure 5 As shown, in some embodiments, the illumination unit 103133 is rectangular, and the width L1 of the illumination unit is greater than or equal to the width L2 of the winding needle. Exemplarily, such a setting can increase the illumination range of the illumination unit 103133, ensure sufficient illumination near the winding needle 3, and thus improve the quality of the taken pole piece images. In practical applications, the illumination unit 103133 can also be set as cylindrical, etc., and the present application does not limit this.

[0061] Figure 18 is a schematic diagram of cross shooting between the first camera and the second camera in an embodiment of the present application, Figure 19 is a schematic diagram of parallel shooting between the first camera and the second camera in an embodiment of the present application. Reference Figure 18 and Figure 19 As shown, in some embodiments, the second camera 12 is arranged facing the negative pole piece 14, and there is an included angle a between the lens center line 121 of the second camera and the surface of the negative pole piece 14. The range of the included angle a satisfies: 60° ≤ a ≤ 120°. Exemplarily, the included angle a can be set to 60°, 70°, 80°, 90°, 100°, 110°, 120°, etc., and the present application does not limit this. Figure 18 In the illustrated embodiment, the included angle a is set to 90°; Figure 19 In the illustrated embodiment, the included angle a is set to 80°.

[0062] Reference Figure 18 As shown, in some embodiments, the first camera 9 is arranged facing the winding needle 3, and the lens center line 91 of the first camera is aligned with the center point 31 of the winding needle. Exemplarily, such an arrangement allows the first camera 9 to capture the pole piece images near the entire winding needle 3. Reference Figure 19 As shown, in practical applications, the first camera 9 can be arranged facing the winding needle 3 as needed, so that the lens center line 91 of the first camera falls on the surface of the negative pole piece 14. The present application does not limit the setting method of the first camera 9. Figure 18 In the embodiments shown, the setting methods of the first camera 9 and the second camera 12 can form a camera cross-shooting scheme; Figure 19 In the embodiments shown, the setting methods of the first camera 9 and the second camera 12 can form a camera parallel-shooting scheme, and either camera shooting scheme can be freely selected as needed.

[0063] Figure 20 is a schematic diagram of setting two first cameras in an embodiment of the present application. Reference Figure 20 As shown, in this embodiment, two first cameras 9 and one second camera 12 are shown. The two first cameras 9 can be arranged in parallel and face the winding needle 3. Such an arrangement can obtain pole piece images near the winding needle 3 from more different perspectives, which helps to improve the accuracy of subsequent pole piece defect detection. The first camera 9 and the second camera 12 can be line scan cameras or area array cameras, etc. The present application does not limit the number and type of the first camera and the second camera.

[0064] Figure 2 is a schematic diagram of the structure of the pole piece feeding and winding deviation correction assembly in an embodiment of the present application. Reference Figure 2 As shown, in some embodiments, the pole piece feeding and winding deviation correction assembly 145 includes a first deviation correction bracket 47, a second deviation correction bracket 45, a deviation correction drive motor 41, a first deviation correction roller 42, and a second deviation correction roller 43. The first deviation correction bracket 47 is connected to the substrate 1, the second deviation correction bracket 45 is slidably connected to the first deviation correction bracket 47, and the second deviation correction bracket 45 is also respectively connected to the first deviation correction roller 42 and the second deviation correction roller 43. The first deviation correction roller 42 and the second deviation correction roller 43 are arranged side by side, and the negative pole piece 14 and / or the positive pole piece 16 can pass through the gap between the first deviation correction roller 42 and the second deviation correction roller 43. The deviation correction drive motor 41 is connected to the first deviation correction roller 42, and the deviation correction drive motor 41 is used to drive the first deviation correction roller 42 to roll so as to drive the negative pole piece 14 and / or the positive pole piece 16 to move.

[0065] Continue to refer to Figure 2As shown, by way of example, the deviation correction drive motor 41 can be set as a servo motor, a stepper motor, etc. A slide rail (not shown) is provided on the second deviation correction bracket 45, and a guide rail (not shown) is provided on the first deviation correction bracket 47. The second deviation correction bracket 45 and the first deviation correction bracket 47 are slidably connected through the slide rail and the guide rail, so that the second deviation correction bracket 45 can slide relative to the first deviation correction bracket 47. The first deviation correction roller 42 can be set as a rubber roller, and the second deviation correction roller 43 can be set as an aluminum roller. There is a gap between the first deviation correction roller 42 and the second deviation correction roller 43 so that the negative electrode sheet 14 and the positive electrode sheet 16 can pass through it. The first deviation correction roller 42 is connected to the deviation correction drive motor 41 as a driving roller, and the second deviation correction roller 43 can be driven by the first deviation correction roller 42 or the electrode sheet to roll as a driven roller.

[0066] In some embodiments, the in-roll deviation correction assembly 145 of the electrode sheet further includes a deviation correction roller bracket 44 and a deviation correction roller slider 46. The deviation correction roller bracket 44 is respectively connected to the deviation correction roller slider 46 and the second deviation correction roller 43. A slide rail (not shown) is provided on the deviation correction roller slider 46, and a guide rail 451 is provided on the second deviation correction bracket 45. The deviation correction roller slider 46 and the second deviation correction bracket 45 are slidably connected through the slide rail and the guide rail 451. By way of example, the deviation correction roller slider 46 can be set as a slider. The deviation correction roller slider 46 can slide relative to the second deviation correction bracket 45. When the deviation correction roller slider 46 moves away from or closer to the first deviation correction roller 42, the deviation correction roller slider 46 can drive the deviation correction roller bracket 44 and the second deviation correction roller 43 to move synchronously, so that the gap size between the first deviation correction roller 42 and the second deviation correction roller 43 can be adjusted.

[0067] Reference Figure 1 and Figure 2 As shown, by way of example, both the negative in-roll deviation correction assembly 4 and the positive in-roll deviation correction assembly 5 can adopt the Figure 2 setting method of the in-roll deviation correction assembly 145 of the electrode sheet shown. The negative in-roll deviation correction assembly 4 can convey the negative electrode sheet 14 to the winding needle 3 for winding, and the positive in-roll deviation correction assembly 5 can convey the positive electrode sheet 16 to the winding needle 3 for winding. During the winding process of the electrode sheet, the in-roll deviation correction assembly 145 of the electrode sheet can correct the positive electrode material line and the negative electrode material line to ensure the alignment of the electrode sheet and the separator. The in-roll deviation correction assembly 145 of the present application can perform a coarse-grained position adjustment on the electrode sheet through the second deviation correction bracket 45, and perform a fine-grained position adjustment on the electrode sheet through the deviation correction roller slider 46 and the deviation correction roller bracket 44, so as to ensure that the alignment of the electrode sheet and the separator meets the production requirements and improve the production quality of the battery cell.

[0068] Reference Figure 1As shown, in some embodiments, the pole piece winding device 100 further includes a film combining roller assembly 6. The film combining roller assembly 6 is connected to the substrate 1. The film combining roller assembly 6 includes a film combining roller driving motor 61 and a film combining roller supporting part 7. The film combining roller driving motor 61 is connected to the film combining roller supporting part 7. The film combining roller supporting part 7 is connected to the first separator 15 and / or the second separator 17. The film combining roller driving motor 61 is configured to drive the film combining roller supporting part 7 to move so as to drive the first separator 15 and / or the second separator 17 to move. Exemplarily, the film combining roller driving motor 61 can be set as a servo motor, a stepper motor, etc. Figure 1 The film combining roller supporting part 7 shown in Figure 1 is in a rectangular strip shape. Figure 1 In the embodiment shown, only one film combining roller assembly 6 is shown. This film combining roller assembly 6 is used to control the movement of the second separator 17 so as to adjust the position of the second separator 17 on the winding needle 3. In practical applications, one or more film combining roller assemblies can be provided to adjust the positions of the first separator 15 and the second separator 17, and the present application does not make any limitations.

[0069] Figure 14 is a schematic diagram of a pole piece defect detection system according to an embodiment of the present application. Refer to Figure 14 As shown, an embodiment of the present application also discloses a pole piece defect detection system 1600, including the pole piece winding device 100 and a processor 1610 as described above. The processor 1610 is configured to perform defect detection on the negative pole piece 14 and / or the positive pole piece 16 according to the images captured by the image acquisition component 811. Exemplarily, the pole piece defects include breakage, scratches, foreign objects, etc. The processor 1610 can also detect the alignment degree among the negative pole piece 14, the first separator 15, the positive pole piece 16, and the second separator 17, so as to monitor the qualification status of the battery cell in real time.

[0070] Exemplarily, in some embodiments, the pole piece defect detection system can be set to include: an industrial personal computer, a camera, a light source, a device encoder, and a motion execution component (such as a programmable logic controller PLC). When the pole piece enters the camera shooting area, the device encoder is configured to send a signal to trigger the camera to start shooting the pole piece image and send it to the industrial personal computer. During the image acquisition process, the light source continuously supplements light to the camera shooting area. The industrial personal computer performs image processing on the pole piece image sent by the camera, obtains the defect detection result and feeds it back to the motion execution component. The motion execution component marks the battery cell according to the feedback result, marks the battery cell without defects as qualified, and marks the battery cell with defects as unqualified. The unqualified battery cells cannot flow out as finished products, and the defect detection result can be generated according to the defect identification in the pole piece image and stored in the industrial personal computer.

[0071] Figure 15 is a schematic diagram of a pole piece image captured by a second camera in an embodiment of the present application. Figure 16It is a schematic diagram of the pole piece image captured by the first camera in an embodiment of the present application. Refer to Figure 15 and Figure 16 As shown, exemplarily, during the process of pole piece defect detection, the overall film surface size and defects of the pole piece can be detected. When detecting the size of the pole piece, image processing can be performed on the original pole piece image captured by the camera, and the edge position of the pole piece can be determined according to the change of pixel values in the processed pole piece image, thereby obtaining the pole piece size. Figure 15 and Figure 16 The images shown are the images after image processing. Figure 15 The negative pole piece 14 and the first separator 15 are shown in Figure 16 The negative pole piece 14, the positive pole piece 16, and the second separator 17 are shown in . The pure black part is the image background that does not need to be concerned about during the defect detection process.

[0072] Exemplarily, when detecting pole piece defects, image processing can be performed on the original pole piece image captured by the camera, and possible defects in the pole piece image can be detected according to the image brightness, image geometric features, etc. In practical applications, the definition of pole piece defects can refer to: (1) Pole piece breakage: the breakage width ≥ 0.2 mm and the breakage height ≥ 0.2 mm or the breakage area ≥ 0.3 mm 2 ; (2) Fold scratch: the fold scratch width ≥ 1 mm and the fold scratch height ≥ 1 mm or the fold scratch area ≥ 25 mm 2 or the total EA area ≥ 10 mm 2 ; (3) Foreign object: the foreign object width ≥ 0.2 mm and the foreign object height ≥ 0.2 mm or the foreign object area ≥ 3 mm 2 ; where, mm represents millimeter, and EA (Electrode Area) represents the electrode area.

[0073] The timing of the first camera 9 and the second camera 12 capturing the pole piece image is introduced here. Figure 10 It is a schematic diagram when the negative pole piece is fed in an embodiment of the present application. Figure 11 It is a schematic diagram when the cutting of the negative pole piece ends in an embodiment of the present application. Figure 12 It is a schematic diagram when the positive pole piece is fed in an embodiment of the present application. Figure 13 It is a schematic diagram when the cutting of the positive pole piece ends in an embodiment of the present application. Exemplarily, refer to Figure 10 As shown, when the negative pole piece 14 reaches the negative feed detection position 26, the second camera 12 starts to capture the pole piece image. Refer to Figure 11 As shown, when the negative pole piece 14 ends winding and is located at the negative cutting end detection position 27, the second camera 12 stops capturing the pole piece image. Refer to Figure 12 As shown, when the positive pole piece 16 reaches the positive feed detection position 28, the first camera 9 starts to capture the pole piece image. Refer toFigure 13 As shown, when the positive electrode tab 16 finishes winding and is located at the positive electrode cutting end detection position 29, the first camera 9 stops taking pictures of the tab image.

[0074] Figure 17 It is a flowchart of defect detection during the tab winding process in an embodiment of the present application. Refer to Figure 17 as shown, Figure 17 There are two branches shown in it. The left branch includes steps S2321 to S2351, and the right branch includes steps S2322 to S2352. The left branch and the right branch can be executed synchronously. Exemplarily, in step S2310, the tab winding device starts to wind, and the positive electrode and the negative electrode are fed with tabs at the same time; in step S2321, the negative electrode tab enters the winding deviation correction component to feed the tab to the pre-winding position; in step S2331, an image acquisition signal is sent to the second camera to start taking pictures; in step S2341, the second camera starts to acquire images, and the tab defect detection system performs real-time processing on the acquired images and judges whether there are defects on the tab. If a defect is detected, the defect picture is saved and an alarm is issued; in step S2351, defect detection and the alignment degree detection between the separator and the negative electrode tab are performed throughout the winding process. After the negative electrode tab is cut off, the detection stops after the tail cutting position passes through the field of view area of the second camera.

[0075] Continue to refer to Figure 17 as shown, in step S2322, the positive electrode tab enters the winding deviation correction component to feed the tab to the winding needle for winding; in step S2332, an image acquisition signal is sent when the positive electrode tab enters the winding needle and rotates to the position detected by the first camera; in step S2342, the first camera starts to acquire images, and the tab defect detection system performs real-time processing on the acquired images and judges whether there are defects on the tab. If a defect is detected, the defect picture is saved and an alarm is issued; in step S2352, defect detection and the alignment degree detection between the separator and the positive electrode tab and the negative electrode tab are performed throughout the winding process. After the positive electrode tab is cut off, the detection stops after the tail cutting position passes through the field of view area of the first camera; in step S2360, the cell winding ends, and the detection result is output.

[0076] Although various examples are discussed in the above disclosure for some currently considered useful utility model embodiments, it should be understood that such details only serve the purpose of illustration. The appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that conform to the essence and scope of the embodiments of the present application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only through software solutions, such as installing the described system on existing servers or mobile devices.

[0077] Similarly, it should be noted that, in order to simplify the description disclosed in the present application and thus help the understanding of one or more utility model embodiments, in the foregoing description of the embodiments of the present application, sometimes multiple features are merged into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of the present application are more than those mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above.

[0078] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used for the description of embodiments are modified by the modifiers "about", "approximate" or "substantially" in some examples. Unless otherwise stated, "about", "approximate" or "substantially" indicate that the said numbers allow a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values may vary according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and parameters used in some embodiments of the present application to confirm the breadth of their scope are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0079] Although the present application has been described with reference to the current specific embodiments, those of ordinary skill in the art in the technical field of the present application should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications of the above embodiments are within the scope of the spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A pole piece winding device, characterized in that: It includes a substrate, a winding needle, a pole piece winding correction component and an image acquisition component, among which: The winding needle is connected to the substrate, and is used to wind the negative electrode sheet, the first separator, the positive electrode sheet and the second separator stacked in sequence; The pole piece winding correction assembly is connected to the substrate, and the pole piece winding correction assembly is used to adjust the position of the negative pole piece and / or the position of the positive pole piece; The image acquisition component is connected to the substrate, and the image acquisition component includes a first camera and a second camera arranged on the same side, the first camera is used to capture the image around the winding needle, and the second camera is used to capture the image of the negative electrode sheet; the image acquisition component also includes a moving component, the moving component is connected to the first camera and / or the second camera, and the moving component is used to control the movement of the first camera and / or the second camera.

2. The pole piece winding device according to claim 1, characterized in that: The moving assembly includes a moving drive motor, a screw rod and a connecting piece, wherein the moving drive motor is connected to the screw rod, one side of the connecting piece is sleeved on the screw rod, and the other side of the connecting piece is connected to the first camera and / or the second camera, and the moving drive motor is used to drive the screw rod to rotate, thereby driving the connecting piece to move.

3. The pole piece winding device according to claim 1, characterized in that: The image acquisition assembly also includes an illumination unit, a bracket base and a bracket connector. The bracket base is connected to the substrate. The illumination unit is movably connected to the bracket base via the bracket connector. The illumination unit is used to provide lighting for the first camera and / or the second camera.

4. The pole piece winding device according to claim 3, characterized in that: The illumination portion is rectangular, and the width of the illumination portion is greater than or equal to the width of the winding needle.

5. The pole piece winding device according to claim 1, characterized in that: The second camera is arranged toward the negative electrode plate, and an angle a is formed between a center line of a lens of the second camera and a surface of the negative electrode plate, and a range of the angle a satisfies: 60°≤a≤120°.

6. The pole piece winding device according to claim 1, characterized in that: The first camera is arranged toward the winding needle, and the center line of the lens of the first camera is aligned with the center point of the winding needle.

7. The pole piece winding device according to claim 1, characterized in that: The pole piece winding correction assembly includes a first correction bracket, a second correction bracket, a correction drive motor, a first correction roller and a second correction roller. The first correction bracket is connected to the substrate, the second correction bracket is slidably connected to the first correction bracket, and the second correction bracket is also respectively connected to the first correction roller and the second correction roller. The first correction roller and the second correction roller are arranged side by side, and the negative pole piece and / or the positive pole piece can pass through the gap between the first correction roller and the second correction roller. The correction drive motor is connected to the first correction roller, and the correction drive motor is used to drive the first correction roller to roll, thereby driving the negative pole piece and / or the positive pole piece to move.

8. The pole piece winding device according to claim 7, characterized in that: The pole piece winding correction assembly also includes a correction roller bracket and a correction roller sliding member, the correction roller bracket is respectively connected to the correction roller sliding member and the second correction roller, the correction roller sliding member is provided with a slide rail, the second correction bracket is provided with a guide rail, the correction roller sliding member and the second correction bracket are slidably connected through the slide rail and the guide rail.

9. The pole piece winding device according to claim 1, characterized in that: It also includes a film-joining roller assembly, which is connected to the substrate, and the film-joining roller assembly includes a film-joining roller drive motor and a film-joining roller support portion, the film-joining roller drive motor is connected to the film-joining roller support portion, and the film-joining roller support portion is connected to the first diaphragm and / or the second diaphragm, and the film-joining roller drive motor is used to drive the film-joining roller support portion to move, thereby driving the first diaphragm and / or the second diaphragm to move.

10. A pole piece defect detection system, characterized in that: It comprises a pole piece winding device and a processor as described in any one of claims 1 to 9, wherein the processor is used to perform defect detection on the negative pole piece and / or the positive pole piece according to an image taken by an image acquisition component.

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