An electrode sheet wrinkling detection device and a battery cell production apparatus

Abstract

This invention provides an electrode wrinkling detection device and a battery cell production equipment, belonging to the field of battery technology. The electrode wrinkling detection device includes a CCD detection mechanism and a moving mechanism. The moving mechanism moves the CCD detection mechanism on the winding machine table in the area facing the battery cell and adjusts the shooting angle of the CCD detection mechanism. The CCD detection mechanism includes a connected CCD camera and a detection module. The CCD camera takes pictures of the battery cell to obtain a battery cell image and transmits the image to the detection module. The detection module detects whether there is electrode wrinkling in the battery cell image based on a grayscale algorithm and outputs the detection result. This device can accurately output detection results, promptly identify problematic battery cells, avoid continuing to produce wrinkled battery cells, effectively reduce the investment of manpower and resources, and improve the accuracy of the detection results.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, and more specifically, relates to an electrode wrinkling detection device and a battery cell production equipment. Background Technology

[0002] Existing battery winding processes often exhibit various defects, such as electrode wrinkling, electrode folding, and tab folding. Among these, cells with wrinkled electrodes pose risks like lithium plating, short circuits, and low capacity, making them a primary concern during production. A common method involves aggregating cells from each winding machine onto a logistics line and manually inspecting their appearance and disassembling them to determine if wrinkling is present. This method is inaccurate and resource-intensive. Furthermore, problematic cells are continuously generated during this process, and adjusting the machine only after wrinkling is detected introduces a delay.

[0003] Therefore, there is an urgent need for a device that can automatically detect the wrinkling of battery cell electrodes in a timely and accurate manner. Summary of the Invention

[0004] The purpose of this invention is to provide an electrode wrinkling detection device and a cell production equipment to solve the problem that the existing technology cannot achieve automated detection of electrode wrinkling.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides an electrode wrinkling detection device, including a CCD detection mechanism and a moving mechanism. The moving mechanism is used to drive the CCD detection mechanism to move on the winding machine table in the area facing the battery cell, and to adjust the shooting angle of the CCD detection mechanism.

[0006] The CCD testing facility includes a connected CCD camera and a testing module. The CCD camera is used to take pictures of the battery cell to obtain battery cell images, and then transmits the battery cell images to the testing module.

[0007] The detection module is used to detect whether there is electrode wrinkling in the battery cell image based on the grayscale algorithm, and outputs the detection result.

[0008] The electrode wrinkling detection device provided by this invention includes a CCD detection mechanism and a moving mechanism. The CCD detection mechanism takes pictures of the battery cells on the winding machine and performs detection using a grayscale algorithm. It can detect the presence of electrode wrinkling through the diaphragm and accurately output the detection results. This allows for the timely identification of problematic battery cells and prompts operators to perform debugging, preventing the continued production of wrinkled battery cells. This effectively reduces the investment of manpower and resources and improves the accuracy of the detection results. The moving mechanism can move the CCD detection mechanism in a plane parallel to the winding needle and adjust the shooting angle of the CCD detection mechanism, thereby adapting to the detection needs of battery cells of different specifications.

[0009] In one embodiment, the CCD inspection mechanism further includes an optical lens and a light source. The optical lens is mounted on the lens interface of the CCD camera, and the relative positions of the light source and the optical lens are fixed. By setting the light source, when the CCD inspection mechanism takes pictures of the battery cell during the winding process, the light field of the imaging area can be adjusted to improve the quality of the obtained battery cell images. This reduces the difficulty of subsequent inspection and analysis of the battery cell images by the inspection module and improves the accuracy of the inspection results.

[0010] In one embodiment, the CCD camera is positioned towards the winding needle and / or the electrode tangent to the winding needle on the winding machine. Generally, setting the CCD camera's shooting direction towards the winding needle is sufficient, especially towards the side of the winding needle opposite to the electrode entry point. This setting allows for obtaining images of the wound cell without obstructing the winding process. However, there is another situation where, due to process variations, the separator may have striations or stains that do not affect cell quality but can interfere with the detection of electrode wrinkling. Therefore, by adjusting the CCD camera's shooting direction to face the electrode tangent to the winding needle, more accurate and detailed images of the cell can be obtained.

[0011] In one embodiment, the moving mechanism includes a slide rail, a slider, and a connecting seat. The slide rail is parallel to the winding needle, the slider is slidably mounted on the slide rail, and the connecting seat is slidably mounted on the slider and moves in a direction close to or away from the winding needle. The CCD camera is connected to the connecting seat. Through the cooperation of the slide rail, the slider, and the connecting seat, the shooting position of the CCD camera in the direction parallel to the winding needle and in the direction close to or away from the winding needle can be adjusted, thereby adapting to battery cells of different diameters, heights, and other specifications.

[0012] In one embodiment, the connector includes a vertically connected side plate and a base plate. A rotating shaft parallel to the winding needle is provided on the side plate, and the CCD camera is connected to the side plate via the rotating shaft. The connector is slidably mounted on a slider via the base plate. Specifically, the vertically connected side plate and base plate provide mounting positions for connecting the CCD camera and the slider. The rotating shaft allows for adjustment of the CCD camera's shooting angle to accommodate various usage needs.

[0013] In one embodiment, a through groove extending from the edge of the side plate to the connection between the side plate and the rotating shaft is also provided on the side plate. The through groove is used to set a limiting member. The limiting member passes through the through groove and abuts against the rotating shaft to prevent the rotating shaft from rotating. In order to maintain the angle of the CCD camera after it has been adjusted, the limiting member can be inserted from the through groove to the circumferential surface of the rotating shaft.

[0014] In one embodiment, a plurality of first through holes are provided on the side of the slider that contacts the base plate. The plurality of first through holes are evenly distributed on the slider in an array along a direction perpendicular to the winding needle. The purpose of providing a plurality of first through holes on the slider is to enable the CDD camera to move toward or away from the winding needle.

[0015] In one embodiment, a plurality of second through holes are provided on the base plate, and the plurality of second through holes are evenly distributed on the base plate in an array along a direction perpendicular to the winding needle;

[0016] The first through hole and the second through hole are connected by a first connector. By adjusting the first connector to pass through the first and second through holes at different positions, the relative position of the CCD camera and the slider can be adjusted, thereby moving the CCD camera closer to or further away from the winding needle. Corresponding to the slider, the base plate of the connector is provided with a second through hole. The cooperation of the first through hole, the second through hole, and the first connector allows for stepped adjustment of the movement distance of the CCD camera in the direction of moving closer to or further away from the winding needle.

[0017] In one embodiment, the base plate is provided with a second connector and a groove perpendicular to the winding direction. One end of the second connector is slidably disposed within the groove, and the other end is embedded in a first through hole. To achieve stepless adjustment of the CCD camera's movement distance in the direction approaching or away from the winding needle, in this embodiment, the aforementioned second through hole is replaced with a groove. Through the cooperation of the first through hole, the groove, and the second connector, irregular or minute adjustments to the CCD camera's movement distance in the direction approaching or away from the winding needle can be achieved.

[0018] In one embodiment, scales are provided on both the slide rail and the side plate to indicate the adjustment values, thereby facilitating precise management of the detection process.

[0019] A second aspect of the present invention provides a battery cell production apparatus, including a winding machine and at least one electrode wrinkling detection device as described above;

[0020] The winding machine includes a first support plate and a second support plate arranged opposite to each other, and a winding needle is arranged between the first support plate and the second support plate. The winding needle is used to wind the battery cell.

[0021] The slide rail is positioned between the first support plate and the second support plate;

[0022] The CCD camera is directed toward the winding needles and / or electrode plates tangent to the winding needles on the winding machine.

[0023] The battery cell production equipment provided by this invention places an electrode wrinkling detection device on the winding machine to photograph the battery cell during the winding process and obtain a battery cell image. Then, a grayscale algorithm is used to detect whether electrode wrinkling exists in the battery cell image, providing accurate and rapid detection results, greatly reducing the investment of manpower and resources. Furthermore, the detection of electrode wrinkling helps to promptly identify the problematic winding machine, allowing for timely restart and debugging, and preventing the continuous production of defective battery cells. The position of the electrode wrinkling detection device can be adjusted according to actual production needs, thereby adjusting the shooting direction of the CCD camera.

[0024] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the battery cell production equipment provided in Embodiment 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the connecting seat in Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of a battery cell with wrinkled electrode sheets provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the battery cell production equipment provided in Embodiment 2 of the present invention;

[0030] Figure 5 This is a schematic diagram of the connecting seat in Embodiment 2 of the present invention;

[0031] Figure 6 This is a schematic diagram of a battery cell with wrinkled electrode plates provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the battery cell production equipment provided in Embodiment 3 of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of the battery cell production equipment provided in Embodiment 4 of the present invention.

[0034] The following are the labeling elements in the figure:

[0035] 1-CCD detection mechanism, 2-slide rail, 3-slider, 31-first through hole, 4-connecting seat, 41-side plate, 411-through groove, 42-bottom plate, 421a-second through hole, 421b-slide groove, 5-rotating shaft, 6-limiting component;

[0036] 7-Winding machine platform, 71-First support plate, 72-Second support plate, 73-Winding needle;

[0037] 8-Battery cell, 81-First diaphragm, 82-Anode plate, 83-Second diaphragm, 84-Cathode plate. Detailed Implementation

[0038] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0041] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0044] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0047] Battery production involves the manufacturing of battery cells, and the quality of the cells directly affects the quality of the battery. The manufacturing process of wound cells involves arranging pre-cut electrode sheets and separators in sequence, then using a winding needle to roll the electrode sheets and separators into a coiled core, which is the battery cell. Various defects can occur during the winding process, such as electrode wrinkling, electrode folding, and tab folding. Among these, cells with wrinkled electrodes pose risks such as lithium plating, short circuits, and low capacity, requiring special attention.

[0048] The inventors have noted that in existing technologies, after a batch of battery cells is wound, the cells produced by each winding machine are aggregated onto a logistics line. The presence of wrinkled electrodes is then detected manually by observing the cell appearance and by disassembling the cells. Manual observation of the cell appearance is not only inaccurate but also prone to errors and omissions, leading to the release of defective cells. Disassembling the cells, on the other hand, can result in the loss of normal cells and is a waste of significant manpower and resources in distinguishing between normal and defective cells. Furthermore, the process from the generation of cells to the detection of wrinkled electrodes is time-consuming, during which the winding machine that produced the defective cells continues to produce cells with wrinkled electrodes, increasing production costs.

[0049] In order to promptly identify problematic battery cells and the corresponding winding machines that produced them, the applicant discovered that the condition of the electrodes can be detected during the battery cell winding process. By detecting electrode wrinkling early, problematic battery cells and the corresponding winding machines that produced them can be identified at an earlier stage. Based on the above considerations, the inventors, after in-depth research, designed an electrode wrinkling detection device and battery cell production equipment using this device.

[0050] This invention provides an electrode wrinkling detection device, comprising a CCD detection mechanism and a moving mechanism. The moving mechanism is used to move the CCD detection mechanism on the winding machine table in the area facing the battery cell and to adjust the shooting angle of the CCD detection mechanism. The CCD detection mechanism includes a connected CCD camera and a detection module. The CCD camera is used to take pictures of the battery cell to obtain a battery cell image and transmit the battery cell image to the detection module. The detection module is used to detect whether there is electrode wrinkling in the battery cell image according to a grayscale algorithm and output the detection result.

[0051] The electrode wrinkling detection device provided by this invention includes a CCD detection mechanism and a moving mechanism. The CCD detection mechanism takes pictures of the battery cells on the winding machine and performs detection using a grayscale algorithm. It can detect the presence of electrode wrinkling through the diaphragm and accurately output the detection results. This allows for timely identification of problematic battery cells and the winding machine that caused the problem, promptly alerting operators to perform adjustments and preventing continued production of wrinkled battery cells. This effectively reduces the investment of manpower and resources and improves the accuracy of the detection results. The moving mechanism can move the CCD detection mechanism in a plane parallel to the winding needle and adjust the shooting angle of the CCD detection mechanism, thereby adapting to the detection needs of battery cells of different specifications. Specifically, the grayscale algorithm determines the presence of electrode wrinkling by comparing the grayscale values ​​of the wrinkled area with those of the normal area.

[0052] It's important to understand that electrodes are divided into anode plates and cathode plates. In the case of lithium-ion batteries, the anode plate is coated with one or more slurries, such as graphite, silicon, silicon oxide, or a graphite-silicon mixture, to form the anode active material coating layer. The cathode plate is coated with a slurry containing lithium ions to form the cathode active material coating layer. A separator is sandwiched between the anode and cathode plates.

[0053] A separator is a thin film used to separate the positive and negative electrodes during electrolysis, preventing direct reaction and energy loss in the electrolytic cell. In the structure of a lithium-ion battery, the separator is one of the key internal components. The performance of the separator determines the battery's interface structure, internal resistance, and other characteristics, directly affecting the battery's capacity, cycle life, and safety performance. A high-performance separator plays a crucial role in improving the overall performance of the battery.

[0054] A battery cell is an electrochemical cell containing positive and negative electrodes, formed by stacking or winding electrodes and separators in a certain order. It is generally not used directly.

[0055] The electrode wrinkling detection device disclosed in this application can be used, but is not limited to, in the manufacturing process of battery cells such as lithium-ion batteries and sodium-ion batteries that have a winding process. Based on the electrode wrinkling detection device provided in this application, it is beneficial to promptly detect wrinkled electrodes during the battery cell manufacturing process, thereby promptly identifying problematic battery cells and the winding machine that produced them. This allows for accurate picking out of problematic battery cells and adjustment of the winding machine that produced them, preventing the continuous production of problematic battery cells and reducing production losses while preventing problematic battery cells from being released.

[0056] The present invention provides a detailed description of an electrode wrinkling detection device and a battery cell production equipment, with reference to specific embodiments.

[0057] Example 1:

[0058] Please see Figure 1 Embodiment 1 of the present invention provides an electrode wrinkling detection device, including a CCD detection mechanism 1 and a moving mechanism. The CCD detection mechanism 1 includes a connected CCD camera and a detection module. The CCD camera is used to take pictures of the battery cell 8 during the winding process to obtain an image of the battery cell 8, and transmits the image of the battery cell 8 to the detection module. The detection module is used to detect whether there is electrode wrinkling in the image of the battery cell 8 according to a grayscale algorithm, and outputs the detection result. The CCD camera has an optical lens on its lens interface, which can be replaced according to actual needs. The CCD camera also has a light source, which can be an LED light source. The LED light source is used to adjust the light field of the imaging area, and in conjunction with the moving mechanism, the obtained image of the battery cell 8 can be clearer, which is helpful for subsequent inspection.

[0059] In this embodiment, the moving mechanism is used to move the CCD detection mechanism 1 on the winding machine 7 in the area facing the battery cell 8, and to adjust the shooting angle of the CCD detection mechanism 1. Specifically, the moving mechanism includes a slide rail 2, a slider 3, and a connecting seat 4. The slide rail 2 is parallel to the winding needle 73, the slider 3 is slidably disposed on the slide rail 2, and the connecting seat 4 is slidably disposed on the slider 3 and moves in a direction close to or away from the winding needle 73. The slide rail 2 may include two support rails parallel to the winding needle 73, and the bottom of the slider 3 is provided with a protrusion that is slidably disposed between the two support rails, thereby allowing the slider 3 to slide relatively stably and reliably on the slide rail 2. The CCD camera is disposed on the connecting seat 4, which includes a side plate 41 and a bottom plate 42 connected vertically. The side plate 41 is provided with a rotating shaft 5 parallel to the winding needle 73, and the CCD camera is connected to the side plate 41 through the rotating shaft 5 to realize the adjustable shooting angle of the CCD camera. To maintain the shooting angle after adjustment, a through groove 411 extending from the edge of the side plate 41 to the connection point between the side plate 41 and the rotating shaft 5 is provided on the side plate 41. The through groove 411 is used to install a limiting member 6; the limiting member 6 passes through the through groove 411 and abuts against the rotating shaft 5 to prevent the rotating shaft 5 from rotating. The limiting member 6 can be a bolt. A scale is provided on the outer side of the connection point between the side plate 41 and the rotating shaft 5 to achieve precise adjustment of the shooting angle and to know the adjusted angle. The connecting seat 4 is slidably mounted on the slider 3 via the base plate 42.

[0060] In this embodiment, a plurality of first through holes 31 are provided on the side of the slider 3 that is in contact with the base plate 42. The plurality of first through holes 31 are evenly distributed on the slider 3 in an array along a direction perpendicular to the winding needle 73. The specific structure of the connecting seat 4 is as follows. Figure 2As shown, the base plate 42 has several second through holes 421a, which are also evenly distributed in an array on the base plate 42 along a direction perpendicular to the winding needle 73. The first through hole 31 and the second through hole 421a are connected by a first connector; by adjusting the first connector to pass through the first through hole 31 and the second through hole 421a at different positions, the relative position of the CCD camera and the slider 3 can be adjusted, thereby allowing the CCD camera to move closer to or further away from the winding needle 73 to achieve stepped adjustment. The adjustment values ​​mentioned above are known.

[0061] As can be seen, with the cooperation of slide rail 2, slider 3, and connecting seat 4, the CCD camera can move horizontally on slide rail 2 via slider 3 and vertically on slider 3 via connecting seat 4, depending on the shooting needs. Furthermore, the shooting angle of the CCD camera can be adjusted by rotating the pivot 5. Combined with the use of LED light source, clearer and higher quality images of the battery cell 8 can be obtained.

[0062] In this embodiment, the present invention also provides a battery cell 8 production equipment using the electrode wrinkling detection device. The battery cell 8 production equipment further includes a winding machine 7, which includes a first support plate 71 and a second support plate 72 arranged opposite to each other. A winding needle 73 is disposed between the first support plate 71 and the second support plate 72, and the winding needle 73 is used to wind the battery cell 8. The first diaphragm 81, anode sheet 82, second diaphragm 83, and cathode sheet 84 are wound onto the winding needle 73 in the order of distance from far to near. During the winding process, the winding needle 73 drives the first diaphragm 81, anode sheet 82, second diaphragm 83, and cathode sheet 84 to rotate at high speed, so that the four are tightly wound together to form the battery cell 8. Because the diaphragm material is thin and soft, if the electrode wrinkles, it can be seen through the diaphragm. In this embodiment, the CCD camera's shooting direction is towards the winding needle 73 to obtain an image of the wound battery cell 8. For example, an image of the battery cell 8 with wrinkled electrodes is shown below. Figure 3As shown, the detection module then uses a grayscale algorithm to analyze and determine electrode wrinkling based on the difference in grayscale values ​​between the wrinkled area and the normal area. Specifically, a Region of Interest (ROI) is drawn within the detection range of the cell 8 image, and the grayscale values ​​within the ROI are monitored. When electrode wrinkling occurs, the grayscale value within the ROI will change significantly. The correlation between grayscale value and electrode wrinkling is determined experimentally, and a grayscale value threshold is finally determined to determine electrode wrinkling, thereby achieving automated detection of electrode wrinkling. In this embodiment, the wrinkling of the anode sheet 82 can be observed through the first diaphragm 81. After electrode wrinkling occurs, the operator can adjust the machine in time to reduce the problem of subsequent electrode wrinkling in the cell 8 caused by response lag. More specifically, to eliminate the influence of winding speed on electrode wrinkling detection, a photo is taken every 40mm of anode sheet 82. In actual production, the CCD detection mechanism 1 in the electrode wrinkling detection device can be connected to the winding machine 7, so that the detection results can be transmitted to the winding machine 7. When the detection result is that the electrode is wrinkled, the winding machine 7 will automatically mark the cell 8 that is determined to have wrinkled electrode with a defect code and put it into the NG slot to distinguish it from the normal cell 8.

[0063] Example 2:

[0064] Due to manufacturing processes, issues such as separator streaks and stains may occur in the separator, which do not affect the quality of the battery cell 8 but interfere with the detection of electrode wrinkling. Embodiment 2 of this invention provides a battery cell 8 production equipment, such as... Figure 4 As shown. The first diaphragm 81, cathode plate 84, second diaphragm 83, and anode plate 82 are wound onto the winding needle 73 in the order of far to near. During the winding process, the winding needle 73 drives the first diaphragm 81, cathode plate 84, second diaphragm 83, and anode plate 82 to rotate at high speed, so that the four are tightly wound together to form the battery cell 8.

[0065] Due to the material properties, the cathode sheet 84 is relatively hard and less prone to wrinkling during the winding process, while the anode sheet 82 is more prone to wrinkling. After the first diaphragm 81, cathode sheet 84, second diaphragm 83, and anode sheet 82 are wound in the above sequence, the cathode sheet 84 is located on the outer layer of the anode sheet 82. If the detection position in Embodiment 1 is still used to detect the cell 8, the condition of the anode sheet 82 cannot be clearly observed. Therefore, in this embodiment, the shooting direction of the CCD camera can be adjusted slightly upward by rotating the shaft 5 to capture an image of the electrode tangent to the winding needle 73.

[0066] In this embodiment, a plurality of first through holes 31 are provided on the side of the slider 3 that is in contact with the base plate 42. The plurality of first through holes 31 are evenly distributed on the slider 3 in an array along a direction perpendicular to the winding needle 73. Figure 5As shown, the base plate 42 is provided with a second connector and a groove 421b perpendicular to the direction of the winding needle 73. One end of the second connector is slidably disposed in the groove 421b, and the other end is embedded in the first through hole 31. By adjusting the position of the second connector in the groove 421b, the relative position of the CCD camera and the slider 3 can be adjusted, thereby allowing the CCD camera to move closer to or further away from the winding needle 73 for stepless adjustment. Compared with Embodiment 1, the connector 4 provided in Embodiment 2, due to the setting of the groove 421b, is not limited to a fixed value when adjusting the distance of the CCD camera closer to or further away from the winding needle 73, thus offering greater flexibility and facilitating the adjustment of minute distances. With corresponding scales set next to the groove 421b, the value of the adjustment distance can still be easily determined. In addition, in order to ensure the stability of the relative movement between the slider 3 and the connecting seat 4, two parallel grooves 421b can be set on the base plate 42. The two first through holes 31 on the corresponding slider 3 are each embedded with a second connector, thereby ensuring that a second connector is slidably connected in each groove 421b, so that the connecting seat 4 and the slider 3 will not rotate relative to each other, and finally achieve the stability and reliability of the connecting seat 4 sliding on the slider 3.

[0067] In this embodiment, an image of the unwound anode sheet at position 82 can be directly captured, such as... Figure 6 As shown. It is understandable that if the captured image reveals wrinkles on the anode sheet 82 before winding, the wrinkling will persist as the winding needle 73 continues to wind the separator and electrode sheet into the battery cell 8, resulting in a wrinkled battery cell 8. Therefore, considering issues with the separator itself (such as separator streaks or stains that do not affect the quality of the battery cell 8), the order of the electrode sheet and separator, and even other considerations in the production process, the shooting direction of the CCD camera can be adjusted in a timely manner to obtain images of the battery cell 8 that provide an accurate basis for subsequent detection of electrode wrinkling. Analyzing the obtained images of the battery cell 8 by comparing the grayscale values ​​of the wrinkled and normal areas allows for automated detection of electrode wrinkling and eliminates interference from problematic separators.

[0068] The other settings are the same as in Example 1, and will not be repeated here.

[0069] Example 3:

[0070] Embodiment 3 of the present invention provides a battery cell production equipment, such as... Figure 7As shown, its electrode wrinkling detection device includes a CCD detection mechanism 1 and a moving mechanism. The CCD detection mechanism 1 includes a connected CCD camera and a detection module. The CCD camera is used to take pictures of the battery cell 8 during the winding process to obtain an image of the battery cell 8, and then transmits the image of the battery cell 8 to the detection module. The detection module is used to detect whether there is electrode wrinkling in the image of the battery cell 8 according to a grayscale algorithm, and outputs the detection result. The CCD camera has an optical lens on its lens interface, which can be replaced according to actual needs. The CCD camera also has a light source, which can be an LED light source. Using the LED light source to adjust the light field of the imaging area, combined with the moving mechanism, can make the obtained image of the battery cell 8 clearer, which is helpful for subsequent inspection.

[0071] In this embodiment, the moving mechanism is used to move the CCD detection mechanism 1 on the winding machine 7 in the area facing the battery cell 8, and to adjust the shooting angle of the CCD detection mechanism 1. Specifically, the moving mechanism includes a slide rail 2, a slider 3, and a connecting seat 4. The slide rail 2 is parallel to the winding needle 73, the slider 3 is slidably mounted on the slide rail 2, and the connecting seat 4 is slidably mounted on the slider 3 and moves in a direction close to or away from the winding needle 73. The slide rail 2 may include two support rails parallel to the winding needle 73, one of which is engraved with a scale. The bottom of the slider 3 is provided with a protrusion, which is slidably mounted between the two support rails, so that the slider 3 can slide relatively stably and reliably on the slide rail 2. The CCD camera is mounted on the connecting seat 4, which includes a side plate 41 and a bottom plate 42 connected vertically. The side plate 41 is provided with a rotating shaft 5 parallel to the winding needle 73. The CCD camera is connected to the side plate 41 through the rotating shaft 5 to realize the adjustable shooting angle of the CCD camera. To maintain the shooting angle after adjustment, a through groove 411 extending from the edge of the side plate 41 to the connection between the side plate 41 and the rotating shaft 5 is provided on the side plate 41. The through groove 411 is used to install a limiting member 6; the limiting member 6 passes through the through groove 411 and abuts against the rotating shaft 5 to prevent the rotating shaft 5 from rotating. The limiting member 6 can be a bolt. A scale is provided on the outer side of the connection between the side plate 41 and the rotating shaft 5 to achieve precise adjustment of the shooting angle. The connecting seat 4 is slidably mounted on the slider 3 via the base plate 42.

[0072] In this embodiment, a plurality of first through holes 31 are provided on the side of the slider 3 that is in contact with the base plate 42. These first through holes 31 are evenly distributed in an array on the slider 3 along a direction perpendicular to the winding needle 73. The base plate 42 is provided with a second connector and a groove 421b perpendicular to the winding needle 73. One end of the second connector is slidably disposed within the groove 421b, and the other end is embedded within the first through holes 31. By adjusting the position of the second connector within the groove 421b, the relative position of the CCD camera and the slider 3 is adjusted, thereby allowing the CCD camera to move closer to or further away from the winding needle 73, achieving stepless adjustment. Figure 5As shown, the structure of the connecting seat 4 in this embodiment is the same as that in Embodiment 2. Both use a stepless adjustment method to adjust the distance the connecting seat 4 moves on the slider 3. The adjustment values ​​mentioned above are known.

[0073] As can be seen, with the cooperation of slide rail 2, slider 3, and connecting seat 4, the CCD camera can move horizontally on slide rail 2 via slider 3 and vertically on slider 3 via connecting seat 4, depending on the shooting needs. Furthermore, the shooting angle of the CCD camera can be adjusted by rotating the pivot 5. Combined with the use of LED light source, clearer and higher quality images of the battery cell 8 can be obtained.

[0074] In this embodiment, the winding machine 7 includes a first support plate 71 and a second support plate 72 arranged opposite to each other. A winding needle 73 is disposed between the first support plate 71 and the second support plate 72, and the winding needle 73 is used to wind the battery cell 8. The battery cell 8 is wound onto the winding needle 73 in the order of the first diaphragm 81, the anode sheet 82, the second diaphragm 83, and the cathode sheet 84, from far to near. During the winding process, the winding needle 73 drives the first diaphragm 81, the anode sheet 82, the second diaphragm 83, and the cathode sheet 84 to rotate at high speed, so that the four are tightly wound together to form the battery cell 8. Because the diaphragm material is thin and soft, if the electrode sheet wrinkles, it can be seen through the diaphragm. In this embodiment, the CCD camera is pointed towards the electrode sheet tangent to the winding needle 73 (located on the other side of the winding needle 73, symmetrical to the position of the electrode sheet wrinkling detection device in Embodiment 1) to obtain an image of the wound battery cell 8. This embodiment is similar to Embodiment 1, also observing the wrinkling of the anode sheet 82 through the first diaphragm 81. Then, the detection module uses a grayscale algorithm to analyze and determine electrode wrinkling based on the difference in grayscale values ​​between the wrinkled area and the normal area. Specifically, a Region of Interest (ROI) is drawn within the detection range of the cell 8 image, and the grayscale values ​​within the ROI are monitored. When electrode wrinkling occurs, the grayscale value within the ROI will change significantly. Through experiments, the correspondence between grayscale values ​​and electrode wrinkling is determined, and a grayscale value threshold is finally determined to determine electrode wrinkling, thus achieving automated detection of electrode wrinkling. Due to material properties, the cathode sheet 84 is relatively hard and less prone to wrinkling during the winding process, while the anode sheet 82 is more prone to wrinkling. In this embodiment, the wrinkling of the anode sheet 82 can be observed through the first diaphragm 81. After electrode wrinkling occurs, the operator can adjust the machine in time to reduce the problem of subsequent electrode wrinkling in the cells 8 caused by reaction lag. More specifically, to eliminate the influence of winding speed on electrode wrinkling detection, a photo is taken every 40mm of anode sheet 82. The winding machine 7 automatically marks the defective codes of the battery cells 8 with wrinkled electrode sheets and puts them into the NG slot to distinguish them from the normal battery cells 8.

[0075] Example 4:

[0076] Embodiment 4 of the present invention provides a battery cell production equipment, such as... Figure 8 As shown, on the winding machine 7, the first diaphragm 81, anode sheet 82, second diaphragm 83, and cathode sheet 84 are wound onto the winding needle 73 in the order of farthest to near. During the winding process, the winding needle 73 drives the first diaphragm 81, anode sheet 82, second diaphragm 83, and cathode sheet 84 to rotate at high speed, so that the four are tightly wound together to form the battery cell 8. In this embodiment, an electrode wrinkling detection device is provided on each of the left and right sides of the winding machine 7. The CCD camera in one electrode wrinkling detection device is pointed towards the winding needle 73, and the CCD camera in the other electrode wrinkling detection device is pointed towards the electrode tangent to the winding needle 73. When the winding begins, the electrode and the diaphragm are tightly wound together from a separated state. If electrode wrinkling occurs, the folds will extend at the part where the electrode is tangent to the winding needle 73. The diaphragm material is thin and soft, so electrode wrinkling can also be seen through the diaphragm wrinkling. By taking separate images of cell 8 and cathode plate 84, and analyzing the difference in grayscale values ​​between the wrinkled area and the normal area, the detection of electrode wrinkling can be automated. Once electrode wrinkling is detected, the operator can adjust the machine promptly, reducing the occurrence of wrinkling due to lag.

[0077] An electrode wrinkling detection device is installed on each of the left and right sides of the winding machine 7. This allows images of the battery cell 8 to be obtained from the left and right sides of the winding needle 73 of the winding machine 7. Through experiments, the correlation between grayscale values ​​and electrode wrinkling is determined, and the grayscale value thresholds for both devices are finally established. The wrinkling status is then judged and cross-validated. If the grayscale value of the image captured by either CCD camera is outside the normal grayscale value range, it is judged as electrode wrinkling. The winding machine automatically marks the wrinkled battery cell 8 with a defect code and places it in the NG slot, distinguishing it from the normal battery cell 8.

[0078] The other settings are the same as in Example 3, and will not be repeated here.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for detecting wrinkles in electrode sheets, characterized in that, It includes a CCD (Charge Coupled Device) detection mechanism and a moving mechanism. The moving mechanism is used to move the CCD detection mechanism on the winding machine table in the area facing the battery cell and to adjust the shooting angle of the CCD detection mechanism. The CCD inspection mechanism includes a connected CCD camera and an inspection module. The CCD camera is used to take pictures of the battery cell during the winding process to obtain battery cell images, and then transmits the battery cell images to the inspection module. The detection module is used to detect whether there is electrode wrinkling in the cell image based on the grayscale algorithm, and output the detection result; The moving mechanism is configured to allow the CCD camera to switch between a position facing the winding needle on the winding machine table and a position facing the electrode sheet tangent to the winding needle.

2. The electrode wrinkling detection device according to claim 1, characterized in that, The CCD inspection mechanism also includes an optical lens and a light source. The optical lens is mounted on the lens interface of the CCD camera, and the relative position of the light source and the optical lens is fixed.

3. The electrode wrinkling detection device according to claim 1, characterized in that, The moving mechanism includes a slide rail, a slider, and a connecting seat. The slide rail is parallel to the winding needle, the slider is slidably disposed on the slide rail, and the connecting seat is slidably disposed on the slider and moves in a direction close to or away from the winding needle. The CCD camera is connected to the connecting seat.

4. The electrode wrinkling detection device according to claim 3, characterized in that: The connecting seat includes a side plate and a base plate that are vertically connected. A rotating shaft parallel to the winding needle is provided on the side plate, and the CCD camera is connected to the side plate through the rotating shaft. The connecting seat is slidably mounted on the slider through the base plate.

5. The electrode wrinkling detection device according to claim 4, characterized in that, The side plate is also provided with a through groove extending from the edge of the side plate to the connection between the side plate and the rotating shaft. The through groove is used to set a limiting member. The limiting member passes through the through groove and abuts against the rotating shaft to prevent the rotating shaft from rotating.

6. The electrode wrinkling detection device according to claim 5, characterized in that, The slider has several first through holes on the side that is in contact with the base plate. The several first through holes are evenly distributed on the slider in an array along a direction perpendicular to the winding needle.

7. The electrode wrinkling detection device according to claim 6, characterized in that, The base plate is provided with a plurality of second through holes, which are evenly distributed in an array on the base plate along a direction perpendicular to the winding needle; the first through holes and the second through holes are connected by a first connector; by adjusting the first connector to pass through the first through holes and the second through holes at different positions, the relative position of the CCD camera and the slider is adjusted, thereby making the CCD camera move closer to or further away from the winding needle.

8. The electrode wrinkling detection device according to claim 6, characterized in that, The base plate is provided with a second connector and a groove perpendicular to the direction of the winding needle. One end of the second connector is slidably disposed in the groove, and the other end is embedded in the first through hole.

9. The electrode wrinkling detection device according to claim 7 or 8, characterized in that, The slide rail and side plate are both equipped with scales.

10. A battery cell manufacturing equipment, characterized in that, Includes a winding machine and at least one electrode wrinkling detection device as described in any one of claims 3-9; The winding machine includes a first support plate and a second support plate arranged opposite to each other, and a winding needle is arranged between the first support plate and the second support plate. The winding needle is used to wind the battery cell. The slide rail is disposed between the first support plate and the second support plate.

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