Winding cell tab defect detection device and detection method

Abstract

The invention discloses a winding cell tab defect detection device which comprises a conveying mechanism, a first detection mechanism, a second detection mechanism and a processing unit, two detection stations are arranged on a conveying path of the conveying mechanism, and two cameras are arranged on each detection station. One camera of the first detection station shoots images of the end face and the first side face of the first tab, and the other camera shoots images of the end face and the second side face of the first tab; one camera of the second detection station shoots the images of the end face and the first side face of the second tab, and the other camera shoots the images of the end face and the second side face of the other tab; the processing unit is configured to process the image information sent by the four cameras so as to judge whether the two tabs have defects or not according to a processing result; the detection device can shoot the end face, the first side face and the second side face of the winding battery cell, and the accuracy and precision of winding battery cell tab defect detection are improved.

Description

Technical Field

[0001] This application belongs to the technical field of visual inspection of battery cells, and particularly relates to a device and method for detecting defects of the tabs of wound battery cells. Background Art

[0002] A wound battery cell is formed by winding materials such as the positive electrode, separator paper, and negative electrode of the battery. Wound battery cells can be divided into cylindrical battery cells and rectangular battery cells according to their shapes. A wound battery cell usually includes a battery cell body and two tabs spaced at one end of the battery cell body. The tabs are important components in the battery, and electrical connection between the inside and outside of the battery is achieved through the tabs.

[0003] During the production process of wound battery cells, it is necessary to detect the tabs of the multi-layer structure of the wound battery cells to determine whether there are defects such as folding and missing in each layer of tabs. The existing detection methods are mainly divided into manual detection and CCD visual detection. Manual detection has low detection efficiency and large detection errors; while the existing CCD visual detection usually only takes pictures of a single side of the tab, and processes and analyzes the pictures of the single side to determine whether there are defects in each layer of tabs, resulting in the problem of low detection accuracy. Summary of the Invention

[0004] The purpose of this application is to provide a device for detecting defects of the tabs of wound battery cells to solve the problem of low detection accuracy in the existing detection of defects of the tabs of wound battery cells. Another purpose of this application is to provide a detection method based on the device for detecting defects of the tabs of wound battery cells.

[0005] To achieve this purpose, this application adopts the following technical solutions:

[0006] In the first aspect, this application proposes a device for detecting defects of the tabs of wound battery cells. Two tabs are spaced at one end of the wound battery cell. The tab is a square structure as a whole. The tab includes an end face, a top face, a bottom face, a first side face, and a second side face. The device for detecting defects of the tabs of wound battery cells includes a conveying mechanism, a first detection mechanism, a second detection mechanism, and a processing unit, where:

[0007] A first detection station and a second detection station are arranged on the conveying path of the conveying mechanism. The conveying mechanism is configured to sequentially convey the wound battery cell along a first direction to the first detection station and the second detection station. The two tabs of the wound battery cell at the first detection station and the second detection station face the first side of the conveying mechanism;

[0008] The first detection mechanism is arranged at the first detection station and on the first side of the conveying mechanism. The first detection mechanism includes a first camera and a second camera. The first camera is configured to capture images of the end face and the first side face of the first tab and send the captured image information to the processing unit. The second camera is configured to capture images of the end face and the second side face of the first tab and send the captured image information to the processing unit;

[0009] The second detection mechanism is arranged at the second detection station and on the first side of the conveying mechanism. The second detection mechanism includes a third camera and a fourth camera. The third camera is configured to capture images of the end face and the first side face of the second tab and send the captured image information to the processing unit. The fourth camera is configured to capture images of the end face and the second side face of the second tab and send the captured image information to the processing unit;

[0010] The processing unit is configured to process the image information sent by the first camera, the second camera, the third camera and the fourth camera, and then judge whether there are defects in the two tabs according to the processing results.

[0011] Optionally, the first detection mechanism further includes a barcode scanner. The barcode scanner is installed above the first detection station. The barcode scanner is configured to scan the identification code on the upward-facing surface of the wound battery cell at the first detection station to identify the identity information of the wound battery cell at the first detection station.

[0012] Optionally, the second detection mechanism further includes a base, at least one fifth camera and two strip light sources, where:

[0013] The base is fixedly installed above the second detection station. The fifth camera is installed on the base. The shooting end of at least one fifth camera faces downward and the shooting range covers the upward-facing surface of the wound battery cell at the second detection station. The fifth camera is configured to capture the upward-facing surface of the wound battery cell at the second detection station to cooperate with the processing unit to perform appearance detection on the upward-facing surface of the wound battery cell;

[0014] The two strip light sources are respectively installed on both sides of the base. The strip light sources extend in the first direction. The two strip light sources are configured to emit light towards the wound battery cell when the fifth camera takes pictures.

[0015] Optionally, the winding cell tab defect detection device further includes a plurality of cell toolings, the cell toolings are configured to carry and position the winding cells, and the conveying mechanism is configured to carry and sequentially convey the cell toolings along a first direction to the first detection station and the second detection station, so that the winding cells on the cell toolings are sequentially moved to the first detection station and the second detection station.

[0016] Optionally, lifting assemblies are provided at both the first detection station and the second detection station on the conveying mechanism. The lifting assembly includes a first driving member and a lifting member, wherein: the lifting member is liftably installed on the conveying mechanism and is located below the cell tooling; the fixed end of the first driving member is installed on the conveying mechanism, the driving end of the first driving member is connected to the lifting member, the first driving member is configured to drive the lifting member to lift, and the first driving member drives the lifting member to rise by a preset height to lift the cell tooling at the first detection station or the second detection station to a suspended state.

[0017] Optionally, two sets of limiting assemblies are provided at both the first detection station and the second detection station on the conveying mechanism. The two sets of limiting assemblies are spaced along the first direction. The limiting assembly includes a second driving member and a limiting member, wherein: the limiting member is rotatably installed on the conveying mechanism, the driving end of the second driving member is connected to the limiting member, and the second driving member is configured to drive the limiting member to rotate so that the limiting member switches to a limiting state or an avoidance state;

[0018] The second driving members of the two sets of limiting assemblies drive the corresponding limiting members to rotate upward to the limiting state, so as to respectively abut against both sides of the cell tooling at the first detection station or the second detection station in the first direction, thereby positioning the cell tooling at the first detection station or the second detection station.

[0019] The second driving members of the two sets of limiting assemblies drive the corresponding limiting members to rotate downward to the avoidance state, so that the two limiting members move below the bottom surface of the cell tooling, thereby avoiding the removal of the detected winding cell from the first detection station or the second detection station and the entry of the next winding cell to be detected into the first detection station or the second detection station.

[0020] Optionally, the conveying mechanism is the first conveyor line of the battery cell production line of a battery cell manufacturer. The first conveyor line is configured to receive the wound battery cells from the previous process on the battery cell production line and sequentially convey the received wound battery cells in the first direction to the first detection station and the second detection station. The first conveyor line is further configured to convey the wound battery cells after being detected at the second detection station in the first direction to the next process of the battery cell production line.

[0021] Optionally, the conveying mechanism is the second conveyor line on the first conveyor line that docks with the battery cell production line of a battery cell manufacturer. The first conveyor line is configured to receive the wound battery cells from the previous process on the battery cell production line and convey the received wound battery cells in the first direction to the transfer station. The second conveyor line is configured to receive the wound battery cells at the transfer station and sequentially convey the received wound battery cells to the first detection station and the second detection station for pole ear defect detection. The second conveyor line is further configured to convey the wound battery cells after being detected at the second detection station to the first conveyor line. The first conveyor line is further configured to convey the received and detected wound battery cells in the first direction to the next process of the battery cell production line.

[0022] Optionally, the first camera and the second camera are arranged at intervals in the first direction. The shooting ends of the first camera and the second camera both face the first pole ear. The included angle between the shooting ends of the first camera and the second camera and the second direction is 45°. The first direction is perpendicular to the second direction;

[0023] The third camera and the fourth camera are arranged at intervals in the first direction. The shooting ends of the third camera and the fourth camera both face the second pole ear. The included angle between the shooting ends of the third camera and the fourth camera and the second direction is 45°.

[0024] In a second aspect, the present application provides a method for detecting pole ear defects of wound battery cells, which is implemented by the above-mentioned device for detecting pole ear defects of wound battery cells, and includes the following steps:

[0025] The conveying mechanism receives the wound battery cells to be tested and conveys the received wound battery cells to the first detection station;

[0026] The first camera shoots images of the end face and the first side face of the first pole ear and sends the shot image information to the processing unit. The second camera shoots images of the end face and the second side face of the first pole ear and sends the shot image information to the processing unit;

[0027] The conveying mechanism conveys the wound battery cells that have been photographed at the first detection station to the second detection station;

[0028] The third camera captures images of the end face and the first side face of the second tab and sends the captured image information to the processing unit, and the fourth camera captures images of the end face and the second side face of the second tab and sends the captured image information to the processing unit;

[0029] The processing unit processes the received images of the two tabs, and determines whether there are defects in the two tabs according to the processing results. When processing the two images of each tab, the processing unit includes performing image screening or image fusion processing on the end face part in the two images of the corresponding tab.

[0030] The beneficial effects of the winding battery cell tab defect detection device proposed in this application are as follows:

[0031] 1) It can capture the end face, the first side face and the second side face of the two tabs of the winding battery cell, process the images according to the image information of the three faces, and then determine whether there are defects in the two tabs of the winding battery cell, improving the accuracy and precision of the winding battery cell tab defect detection;

[0032] 2) The image information of the end face part included in both of the two images captured by the first camera and the second camera and the two images captured by the third camera and the fourth camera. The processing unit processes the image of the end face part in the two images of the same tab, further improving the accuracy and precision of the winding battery cell tab defect detection;

[0033] 3) Since the distance between the two tabs is relatively small, two detection stations are provided to perform defect detection on the two tabs of the winding battery cell respectively, improving the accuracy and precision of the winding battery cell tab defect detection;

[0034] 4) The first detection mechanism realizes the code scanning and identification of the winding battery cell to be detected, and the second detection mechanism realizes the appearance detection of the upper side of the winding battery cell. The function integration degree is high, which is beneficial to improving the detection efficiency of the winding battery cell;

[0035] 5) According to needs, the winding battery cell tab defect detection device can be an additional device for the original battery cell production line of the battery cell manufacturer, with low cost and good adaptability;

[0036] 6) According to needs, the winding battery cell tab defect detection device can also be used as an all-in-one machine for the battery cell production line of the battery cell manufacturer, which is easy to implement and has good flexibility. Description of the Drawings

[0037] Figure 1 is a schematic three-dimensional structure diagram of an existing winding battery cell;

[0038] Figure 2It is a schematic perspective view of the winding battery cell tab defect detection device provided by an embodiment of the present application;

[0039] Figure 3 It is a schematic side view of the winding battery cell tab defect detection device provided by an embodiment of the present application;

[0040] Figure 4 It is another schematic perspective view of the winding battery cell tab defect detection device provided by an embodiment of the present application;

[0041] Figure 5 is Figure 4 the partial enlarged view at A in

[0042] Figure 6 It is a schematic structural view of an implementation manner of the conveying mechanism of the winding battery cell tab defect detection device provided by an embodiment of the present application;

[0043] Figure 7 It is a schematic structural view of another implementation manner of the conveying mechanism of the winding battery cell tab defect detection device provided by an embodiment of the present application.

[0044] Figures 1 to 7 It includes the following reference numerals:

[0045] Winding battery cell 10: tab 11, end face 110, top face 111, bottom face 112, first side face 113, second side face 114;

[0046] Conveying mechanism 20: first detection station 21, second detection station 22, first driving member 23, lifting member 24, positioning column 240, second driving member 25, limiting member 26, roller 260, first conveying line 27, second conveying line 28, transfer station 29;

[0047] First detection mechanism 30: first camera 31, second camera 32, barcode scanner 33;

[0048] Second detection mechanism 40: third camera 41, fourth camera 42, base 43, fifth camera 44, bar-shaped light source 45, mounting bracket 46;

[0049] Battery cell tooling 50. Detailed implementation manners

[0050] To make the technical problems solved by the present application, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0051] This application proposes a winding battery cell tab defect detection device. Please refer to Figures 1 to 3 As shown, two tabs 11 are arranged at intervals at one end of the winding battery cell 10. The tabs 11 are of a multi-layer structure and are square as a whole. The tab 11 includes an end face 110, a top face 111, a bottom face 112, a first side face 113, and a second side face 114. The winding battery cell tab defect detection device includes a conveying mechanism 20, a first detection mechanism 30, a second detection mechanism 40, and a processing unit (not shown in the figure). A first detection station 21 and a second detection station 22 are arranged on the conveying path of the conveying mechanism 20. The conveying mechanism 20 is configured to sequentially convey the winding battery cell 10 to the first detection station 21 and the second detection station 22 along a first direction ( Figure 2 the X direction in the figure). The two tabs 11 of the winding battery cell 10 at the first detection station 21 and the second detection station 22 face the first side of the conveying mechanism 20; the first detection mechanism 30 is arranged at the first detection station 21 and is located on the first side of the conveying mechanism 20. The first detection mechanism 30 includes a first camera 31 and a second camera 32. The first camera 31 is configured to capture images of the end face 110 and the first side face 113 of the first tab 11 and send the captured image information to the processing unit. The second camera 32 is configured to capture images of the end face 110 and the second side face 114 of the first tab 11 and send the captured image information to the processing unit; the second detection mechanism 40 is arranged at the second detection station 22 and is located on the first side of the conveying mechanism 20. The second detection mechanism 40 includes a third camera 41 and a fourth camera 42. The third camera 41 is configured to capture images of the end face 110 and the first side face 113 of the second tab 11 and send the captured image information to the processing unit. The fourth camera 42 is configured to capture images of the end face 110 and the second side face 114 of the second tab 11 and send the captured image information to the processing unit; the processing unit is configured to process the image information sent by the first camera 31, the second camera 32, the third camera 41, and the fourth camera 42, and then determine whether there are defects in the two tabs 11 according to the processing results.

[0052] The ear defect detection device for wound battery cells proposed in the embodiments of the present application takes two photos of the L-shaped surfaces of the first ear 11 through the first detection mechanism 30, and takes two photos of the L-shaped surfaces of the second ear 11 through the second detection mechanism 40, realizing the photographing of the end faces 110, the first side faces 113 and the second side faces 114 of the two ears 11 of the wound battery cell 10. The images are processed according to the image information of the three faces, and then it is determined whether there are defects (such as folding, missing, etc.) in the two ears 11 of the wound battery cell 10, improving the accuracy and precision of the ear defect detection of the wound battery cell 10; at the same time, the image information of the end face 110 is included in both of the two images taken by the first detection mechanism 30 and the second detection mechanism 40. Therefore, two pieces of feature information of the end face 110 of the ear 11 can be obtained, and the processing unit processes the images of the end face parts in the two images, further improving the accuracy and precision of the ear defect detection of the wound battery cell; moreover, based on the feature that the distance between the two ears of the wound battery cell 10 is relatively small, two detection stations are provided to respectively perform defect detection on the two ears of the wound battery cell, improving the accuracy and precision of the ear 11 defect detection of the wound battery cell 10.

[0053] As an implementation manner, the first detection mechanism 30 further includes a barcode scanner 33. The barcode scanner 33 is installed above the first detection station 21, and the barcode scanner 33 is configured to scan the identification code on the upward-facing surface of the wound battery cell 10 at the first detection station 21 to identify the identity information of the wound battery cell 10 at the first detection station 21.

[0054] Specifically, the identification code can be any one of a two-dimensional code or a bar code.

[0055] By setting the barcode scanner 33, the identity identification of the wound battery cell 10 at the first detection station 21 is realized, which is convenient for subsequent control of the wound battery cell 10 after detection according to the detection results.

[0056] As an implementation manner, the second detection mechanism 40 further includes a base 43, at least one fifth camera 44 and two strip light sources 45. The base 43 is fixedly installed above the second detection station 22, the fifth camera 44 is installed on the base 43, the shooting end of at least one fifth camera 44 faces downward and the shooting range covers the upward-facing surface of the wound battery cell 10 at the second detection station 22. The fifth camera 44 is configured to take a photo of the upward-facing surface of the wound battery cell 10 at the second detection station 22 to cooperate with the processing unit to perform appearance detection on the upward-facing surface of the wound battery cell 10; the two strip light sources 45 are respectively installed on both sides of the base 43, the strip light sources 45 extend along the first direction, and the two strip light sources 45 are configured to illuminate the wound battery cell 10 when the fifth camera 44 takes a photo.

[0057] Specifically, a frame (not shown in the figure) is fixed above the conveying mechanism 20, and the base 43, the first camera 31, the second camera 32, the third camera 41, and the fourth camera 42 are all fixedly installed on the frame.

[0058] Specifically, since the wound battery cell 10 is relatively long in the first direction, in order to ensure that the shooting range of the fifth camera 44 covers the wound battery cell 10, two fifth cameras 44 are installed on the base 43 at intervals in the first direction, and the installation height of the fifth camera 44 on the base 43 is adjustable.

[0059] Specifically, a mounting frame 46 is installed on the base 43, and two strip-shaped light sources 45 are installed on the mounting frame 46 at intervals in the second direction ( Figure 1 the Y direction in the figure), and the installation angle of the strip-shaped light source 45 on the mounting frame 46 and its installation position in the second direction are adjustable.

[0060] Through the cooperation of the fifth camera 44 and the strip-shaped light source 45, the upward-facing surface of the wound battery cell 10 on the second detection station 22 is photographed and the wound battery cell 10 is supplemented with light when taking the photographed image, so that while detecting the ear defects of the wound battery cell 10, the appearance of a large surface of the wound battery cell 10 can also be detected, improving the detection efficiency of the wound battery cell 10; at the same time, the installation height of the fifth camera 44, the installation angle of the strip-shaped light source 45, and the installation of the strip-shaped light source 45 in the second direction are set to be adjustable, so that the fifth camera 44 is at a suitable shooting height and the strip-shaped light source 45 is at a suitable light supplementing position, ensuring the shooting accuracy and good adaptability.

[0061] As an implementation method, the wound battery cell ear defect detection device further includes a plurality of battery cell toolings 50. The battery cell toolings 50 are configured to carry and position the wound battery cells 10, and the conveying mechanism 20 is configured to carry and sequentially convey the battery cell toolings 50 in the first direction to the first detection station 21 and the second detection station 22, so that the wound battery cells 10 on the battery cell toolings 50 are sequentially moved to the first detection station 21 and the second detection station 22.

[0062] By providing a plurality of battery cell toolings 50, the automatic transfer and precise positioning of the wound battery cells 10 in each process are realized, which is beneficial to improving the accuracy of visual detection.

[0063] Please refer to Figures 3 to Figure 5As shown in the figure, lifting components are provided at both the first detection station 21 and the second detection station 22 on the conveying mechanism 20. The lifting component includes a first driving member 23 and a lifting member 24. The lifting member 24 is installed on the conveying mechanism 20 in a liftable manner and is located below the battery cell tooling 50. The fixed end of the first driving member 23 is installed on the conveying mechanism 20, and the driving end of the first driving member 23 is connected to the lifting member 24. The first driving member 23 is configured to drive the lifting member 24 to lift and lower. The first driving member 23 drives the lifting member 24 to rise by a preset height to lift the battery cell tooling 50 at the first detection station 21 or the second detection station 22 to a suspended state.

[0064] Specifically, the first driving member 23 is any one of a cylinder, a synchronous belt type linear module, or a ball screw type linear module.

[0065] Specifically, the lifting plate 24 is a horizontally arranged lifting plate. A plurality of positioning columns 240 are arranged at intervals on the lifting plate 24. A plurality of positioning holes are provided at the bottom of the battery cell tooling 50 in cooperation with the positioning columns 240. Each positioning column 240 corresponds to a positioning hole. After the first driving member 23 drives the lifting plate 24 to rise to a preset height, the positioning columns 240 are inserted into the corresponding positioning holes to realize the positioning of the battery cell tooling 50.

[0066] Through the cooperation of the first driving member 22 and the lifting member 23, the battery cell tooling 40 at the detection station 21 is lifted to a suspended state, facilitating the two groups of second detection components 32 to take pictures of the corresponding ear tabs 11.

[0067] As an implementation manner, two sets of limiting components are provided at both the first detection station 21 and the second detection station 22 on the conveying mechanism 20. The two sets of limiting components are arranged at intervals along the first direction. The limiting component includes a second driving member 25 and a limiting member 26. The limiting member 26 is installed on the conveying mechanism 20 in a rotatable manner. The driving end of the second driving member 25 is connected to the limiting member 26. The second driving member 25 is configured to drive the limiting member 26 to rotate so that the limiting member 26 switches to a limiting state or an avoidance state. The second driving members 25 of the two sets of limiting components drive the corresponding limiting members 26 to rotate upward to the limiting state to respectively abut against both sides of the battery cell tooling 50 at the first detection station 21 and the second detection station 22 in the first direction, thereby positioning the battery cell tooling 50 at the first detection station 21 and the second detection station 22. The second driving members 25 of the two sets of limiting components drive the corresponding limiting members 26 to rotate downward to the avoidance state, so that the two limiting members 26 move below the bottom surface of the battery cell tooling 50, thereby avoiding the removal of the wound battery cell 10 after detection from the first detection station 21 or the second detection station 22 and the entry of the next battery cell 10 to be detected into the first detection station 21 or the second detection station 22.

[0068] Specifically, a roller 260 is rotatably installed at the end of the limiting member 26, so that the contact between the limiting member 26 and the battery cell tooling 50 is a rolling contact, thereby reducing the wear on the battery cell tooling 50.

[0069] Specifically, the second driving member 25 is a tilting cylinder.

[0070] By providing two sets of limiting components, the battery cell tooling 50 is positioned at the first detection station 21 and the second detection station 22 through the limiting components, thereby improving the position accuracy of the wound battery cell 10 at the first detection station 21 and the second detection station 22 and enhancing the accuracy of detecting the wound battery cell 10.

[0071] Please refer to Figure 2 and Figure 6 As shown in the figure, as an implementation manner, the conveying mechanism 20 is the first conveyor line 27 of the battery cell production line of the battery cell manufacturer. The first conveyor line 27 is configured to receive the wound battery cell 10 from the previous process on the battery cell production line and sequentially convey the received wound battery cell 10 to the first detection station 21 and the second detection station 22 along the first direction. The first conveyor line 27 is further configured to convey the wound battery cell 10 after the ear defect detection at the second detection station 22 to the next process of the battery cell production line along the first direction.

[0072] By setting the conveying mechanism 20 as the first conveyor line 27 of the battery cell production line of the battery cell manufacturer, a wound battery cell ear defect detection device is provided that can be added to the original battery cell production line of the battery cell manufacturer. It has good adaptability and low cost, and can meet the different production rhythm requirements of the production line.

[0073] Please refer to Figure 2 and Figure 7 As shown in the figure, as an implementation manner, the conveying mechanism 20 is the second conveyor line 28 on the first conveyor line 27 that docks with the battery cell production line of the battery cell manufacturer. The first conveyor line 27 is configured to receive the wound battery cell 10 after being wound in the previous process on the battery cell production line and convey the received wound battery cell 10 to the transfer station 29 along the first direction. The second conveyor line 28 is configured to receive the wound battery cell 10 at the transfer station 29 and sequentially convey the received wound battery cell 10 to the first detection station 21 and the second detection station 22 for ear defect detection. The second conveyor line 28 is further configured to convey the wound battery cell 10 after the ear defect detection to the first conveyor line 27. The first conveyor line 27 is further configured to convey the received detected wound battery cell 10 to the next process of the battery cell production line along the first direction.

[0074] Specifically, a handling mechanism is usually provided at the transfer station 29 and the discharge end of the second conveyor line 28, and the handling mechanism is used to realize the transfer of the wound battery cell 10 between the first conveyor line 27 and the second conveyor line 28.

[0075] Specifically, both the first conveyor line 27 and the second conveyor line 28 adopt step-by-step conveyor lines.

[0076] By setting the conveying mechanism 20 as the second conveyor line 28 on the first conveyor line 27 that docks with the battery core production line of the battery core manufacturer, a winding battery core tab defect detection device that docks with the original battery core production line of the battery core manufacturer is provided. That is, the winding battery core tab defect detection device is an all-in-one machine, which is easy to implement and has good flexibility.

[0077] Please refer to Figure 1 and Figure 2 As shown in the figure, as an implementation manner, the first camera 31 and the second camera 32 are arranged at intervals along the first direction. The shooting ends of the first camera 31 and the second camera 32 both face the first tab 11. The included angle between the shooting ends of the first camera 31 and the second camera 32 and the second direction is 45°. The first direction is perpendicular to the second direction;

[0078] The third camera 41 and the fourth camera 42 are arranged at intervals along the first direction. The shooting ends of the third camera 41 and the fourth camera 42 both face the second tab 11. The included angle between the shooting ends of the third camera 41 and the fourth camera 42 and the second direction is 45°.

[0079] By setting the first camera 31, the second camera 32, the third camera 41, and the fourth camera 42, the first camera 31, the second camera 32, the third camera 41, and the fourth camera 42 are in the most suitable shooting angles, thereby improving the accuracy and precision of detection.

[0080] The general working principle of the winding battery core tab defect detection device proposed in the embodiment of the present application is as follows:

[0081] S1. The conveying mechanism 20 receives the winding battery core 10 to be tested and conveys the received winding battery core 10 to the first detection station 21;

[0082] S2. The first camera 31 shoots the images of the end face and the first side face of the first tab 11 and sends the shot image information to the processing unit. The second camera 32 shoots the images of the end face and the second side face of the first tab 11 and sends the shot image information to the processing unit;

[0083] S3. The conveying mechanism 20 conveys the winding battery core 10 that has completed shooting at the first detection station 21 to the second detection station 22;

[0084] S4. The third camera 41 shoots the images of the end face and the first side face of the second tab 11 and sends the shot image information to the processing unit. The fourth camera 42 shoots the images of the end face and the second side face of the second tab 11 and sends the shot image information to the processing unit;

[0085] In S5, the processing unit processes the images of the two tabs 11 received, and determines whether there are defects in the two tabs 11 according to the processing results. When the processing unit processes the two images of each tab 11, it includes performing image screening or image fusion processing on the end face portions in the two images of the corresponding tab 11;

[0086] In S6, the conveying mechanism 20 conveys the detected wound battery cell 10 to the next process.

[0087] The above embodiments only illustrate the basic principles and characteristics of the present application. The present application is not limited by the above examples. Without departing from the spirit and scope of the present application, there are various changes and modifications to the present application, and these changes and modifications all fall within the scope of the present application claimed. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A detecting device for the defects of the tabs of a wound battery cell. Two tabs are arranged at one end of the wound battery cell at intervals. The tabs are of an overall square structure and include an end face, a top face, a bottom face, a first side face and a second side face. It is characterized in that, The winding battery cell tab defect detection device includes a conveying mechanism, a first detection mechanism, a second detection mechanism, and a processing unit, where: A first detection station and a second detection station are provided on the conveying path of the conveying mechanism. The conveying mechanism is configured to sequentially convey the winding battery cell to the first detection station and the second detection station along a first direction. The two tabs of the winding battery cell at the first detection station and the second detection station face the first side of the conveying mechanism; The first detection mechanism is provided at the first detection station and on the first side of the conveying mechanism. The first detection mechanism includes a first camera and a second camera. The first camera is configured to capture images of the end face and the first side face of the first tab and send the captured image information to the processing unit. The second camera is configured to capture images of the end face and the second side face of the first tab and send the captured image information to the processing unit; The second detection mechanism is provided at the second detection station and on the first side of the conveying mechanism. The second detection mechanism includes a third camera and a fourth camera. The third camera is configured to capture images of the end face and the first side face of the second tab and send the captured image information to the processing unit. The fourth camera is configured to capture images of the end face and the second side face of the second tab and send the captured image information to the processing unit; The processing unit is configured to process the image information sent by the first camera, the second camera, the third camera, and the fourth camera, and then determine whether there are defects in the two tabs according to the processing results.

2. The ear defect detection device for wound electric cores according to claim 1, wherein The first detection mechanism further includes a barcode scanner. The barcode scanner is installed above the first detection station. The barcode scanner is configured to scan the identification code on the upward-facing surface of the winding battery cell at the first detection station to identify the identity information of the winding battery cell at the first detection station.

3. The ear defect detection device for the wound battery cell according to claim 1, wherein The second detection mechanism further includes a base, at least one fifth camera, and two strip light sources, where: The base is fixedly installed above the second detection station. The fifth camera is installed on the base. The shooting end of at least one fifth camera faces downward and the shooting range covers the upward-facing surface of the winding battery cell at the second detection station. The fifth camera is configured to capture the upward-facing surface of the winding battery cell at the second detection station to cooperate with the processing unit to perform appearance detection on the upward-facing surface of the winding battery cell; The two strip light sources are respectively installed on both sides of the base. The strip light sources extend along the first direction. The two strip light sources are configured to illuminate the winding battery cell when the fifth camera is shooting.

4. The ear defect detection device for the wound electric core according to claim 1, wherein, The winding battery cell tab defect detection device further includes a plurality of battery cell toolings. The battery cell toolings are configured to carry and position the winding battery cells. The conveying mechanism is configured to carry and sequentially convey the battery cell toolings to the first detection station and the second detection station along the first direction, so that the winding battery cells on the battery cell toolings are sequentially moved to the first detection station and the second detection station.

5. The winding cell tab defect detection device according to claim 1, characterized in that, The conveying mechanism is provided with a jacking assembly at both the first detection station and the second detection station. The jacking assembly includes a first driving member and a lifting member, wherein: the lifting member is installed on the conveying mechanism in a liftable manner and is located below the battery cell tooling; the fixed end of the first driving member is installed on the conveying mechanism, the driving end of the first driving member is connected to the lifting member, and the first driving member is configured to drive the lifting member to lift and lower. The first driving member drives the lifting member to rise by a preset height to jack up the battery cell tooling at the first detection station or the second detection station to a suspended state.

6. The winding battery cell tab defect detection device according to claim 5, wherein, The conveying mechanism is provided with two sets of limiting assemblies at both the first detection station and the second detection station. The two sets of limiting assemblies are arranged at intervals along the first direction. The limiting assembly includes a second driving member and a limiting member, wherein: the limiting member is rotatably installed on the conveying mechanism, the driving end of the second driving member is connected to the limiting member, and the second driving member is configured to drive the limiting member to rotate so that the limiting member switches to a limiting state or an avoidance state; The second driving members of the two sets of limiting assemblies drive the corresponding limiting members to rotate upward to the limiting state, so as to respectively abut against both sides of the battery cell tooling at the first detection station or the second detection station in the first direction through the two limiting members, thereby positioning the battery cell tooling at the first detection station or the second detection station. The second driving members of the two sets of limiting assemblies drive the corresponding limiting members to rotate downward to the avoidance state, so that the two limiting members move below the bottom surface of the battery cell tooling, thereby avoiding the removal of the wound battery cell after detection from the first detection station or the second detection station and the entry of the next wound battery cell to be detected into the first detection station or the second detection station.

7. The winding cell tab defect detection device according to claim 1, characterized in that, The conveying mechanism is the first conveying line of the battery cell production line of the battery cell manufacturer. The first conveying line is configured to receive the wound battery cell from the previous process of the battery cell production line and convey the received wound battery cell to the first detection station and the second detection station in sequence along the first direction. The first conveying line is also configured to convey the wound battery cell after detection at the second detection station to the next process of the battery cell production line along the first direction.

8. The winding battery cell tab defect detection device according to claim 1, wherein, The conveying mechanism is the second conveying line on the first conveying line that docks with the battery cell production line of the battery cell manufacturer. The first conveying line is configured to receive the wound battery cell from the previous process of the battery cell production line and convey the received wound battery cell to the transfer station along the first direction. The second conveying line is configured to receive the wound battery cell at the transfer station and convey the received wound battery cell to the first detection station and the second detection station in sequence to perform tab defect detection. The second conveying line is also configured to convey the wound battery cell after detection at the second detection station to the first conveying line. The first conveying line is also configured to convey the received detected wound battery cell to the next process of the battery cell production line along the first direction.

9. The winding battery cell tab defect detection device according to claim 1, wherein, The first camera and the second camera are arranged at intervals along the first direction, and the shooting ends of the first camera and the second camera both face the first tab. The included angle between the shooting ends of the first camera and the second camera and the second direction is 45°, and the first direction is perpendicular to the second direction. The third camera and the fourth camera are arranged at intervals along the first direction, and the shooting ends of the third camera and the fourth camera both face the second tab. The included angle between the shooting ends of the third camera and the fourth camera and the second direction is 45°.

10. A method for detecting defects of the tabs of a wound battery cell, characterized in that, The method for detecting the defects of the tabs of the wound battery cell is implemented by the device for detecting the defects of the tabs of the wound battery cell according to any one of claims 1-9, and includes the following steps: The conveying mechanism receives the wound battery cell to be measured and conveys the received wound battery cell to the first detection station. The first camera takes images of the end face and the first side face of the first tab and sends the captured image information to the processing unit, and the second camera takes images of the end face and the second side face of the first tab and sends the captured image information to the processing unit. The conveying mechanism conveys the wound battery cell that has completed shooting at the first detection station to the second detection station. The third camera takes images of the end face and the first side face of the second tab and sends the captured image information to the processing unit, and the fourth camera takes images of the end face and the second side face of the second tab and sends the captured image information to the processing unit. The processing unit processes the images of the two tabs received, and judges whether there are defects in the two tabs according to the processing results. When processing the two images of each tab, the processing unit includes performing image screening or image fusion processing on the end face part in the two images of the corresponding tab.

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