Defect detection device and battery production line

Abstract

The utility model relates to the field of detection equipment, in particular to a defect detection device and a battery production line. The defect detection device comprises a shell, a transfer device and a linear scanning type detection mechanism; the transferring device is installed in the shell, the shell is provided with a feeding station and a discharging station, and the transferring device is used for transferring a to-be-detected object on the feeding station to the discharging station so as to form a transferring path; the linear scanning type detection mechanism is installed in the shell and located on the transfer path, and the to-be-detected object can pass through the linear scanning type detection mechanism. According to the defect detection device provided by the invention, the line scanning type detection mechanism is arranged to dynamically detect the battery cell, imaging is carried out in a line scanning integration mode, the detection speed is higher, and the detection efficiency is higher. And when the width of the battery cell is fixed, the length direction is not limited, so that more types of battery cells can be detected. And distortion regions on two sides of the battery cell can be effectively reduced through a line scanning type detection imaging mode, so that the purpose of widening the detection range is achieved.

Description

Technical Field

[0001] The present application relates to the field of detection equipment, and in particular to a defect detection device and a battery production line. Background Art

[0002] Currently, in the lithium battery production process, positive and negative electrodes and separators are wound together to form a core. During this winding process, internal defects such as tab insertion, electrode tearing, and electrode wrinkling can occur. These defects are easily missed after winding, resulting in risks such as high pressure differentials and lithium deposition when shipped to the customer. Therefore, X-ray equipment is often equipped to detect internal defects in bare cells.

[0003] Currently, the traditional internal defect detection function of bare battery cells is achieved by adding an area array detection device to the X-ray machine. This device usually includes a light tube and an area array detector. The light tube emits X-rays. When a defect such as a tear appears inside the bare battery cell, the density of the defect location changes compared to other places, the absorbed X-ray energy changes, and the remaining energy reaching the area array detector changes, thus forming a picture with varying brightness and darkness to achieve the purpose of detection. This solution requires stopping for detection each time the object to be detected reaches between the light tube and the area array detector. This step-by-step detection method is generally inefficient. When the battery cell model is larger than the area array detector, two sets of devices are required for detection. Because the light tube is a point light source, the image after irradiation is distorted, resulting in the inability to properly image the outermost 10mm detection area, posing a risk of missed detection. Utility Model Content

[0004] The purpose of this application is to provide a defect detection device and a battery production line, which can improve the detection efficiency, effectively reduce the distortion area of ​​the detection, and expand the detection range.

[0005] The present application provides a defect detection device, comprising a housing, a transfer device, and a line scanning detection mechanism;

[0006] The transfer device is installed in the housing, and the housing is provided with a loading station and an unloading station. The transfer device is used to transfer the object to be detected at the loading station to the unloading station to form a transfer path;

[0007] The line scanning detection mechanism is installed in the housing and is located on the transfer path. The object to be detected can pass through the line scanning detection mechanism.

[0008] In the above technical solution, further, the transfer device includes a rotating tray and a driving device;

[0009] A plurality of supporting members are provided around the rotating tray, and the supporting members are used to carry the objects to be detected; the supporting members and the inner wall of the shell are surrounded to form an isolation chamber;

[0010] The driving device is used to drive the rotating tray to rotate so that the plurality of supporting parts can flow between the loading station and the unloading station.

[0011] In the above technical solution, further, at least one buffer station is provided on the transfer path; the line scanning detection mechanism is located between the loading station and the buffer station, or the line scanning detection mechanism is located between adjacent buffer stations, or the line scanning detection mechanism is located between the unloading station and the buffer station; the buffer station evenly divides the rotation angle corresponding to the transfer path to form a single step angle of the rotating tray;

[0012] The plurality of material supports circulating on the same transfer path form at least one transfer group, the number of the material supports constituting the transfer group is 2 more than the number of the cache stations on the transfer path, and among the plurality of material supports in the transfer group, the angle between adjacent material supports is the single step angle.

[0013] In the above technical solution, further, it also includes a static detection mechanism, and the static detection mechanism is located at the cache station.

[0014] In the above technical solution, further, the plurality of supporting members of the rotating tray are evenly arranged, and the angle between adjacent supporting members is the single step angle;

[0015] A spacing area is provided between adjacent supporting members, and the sector angle corresponding to the spacing area is the same as the sector angle corresponding to the supporting member.

[0016] In the above technical solution, further, at least one detection area is provided on the circumference of the rotating tray;

[0017] The number of the detection zones is set corresponding to the number of the transfer groups;

[0018] Any of the detection areas is provided with the corresponding loading station, the buffer station, the line scanning detection mechanism and the unloading station; the loading stations and the unloading stations of multiple detection areas are alternately arranged along the rotation direction of the rotating pallet.

[0019] In the above technical solution, further, the rotating tray includes a rotating shaft and at least one tray body;

[0020] A plurality of the material supporting members are arranged around the circumference of the tray body; the rotating shaft is connected to the rotation center of the tray body, and the rotating shaft is connected to the driving device;

[0021] When there are multiple pallet bodies, the multiple pallet bodies are spaced apart along the length direction of the rotating shaft; the shell is correspondingly provided with the loading station and the unloading station on the rotation path of each pallet body.

[0022] In the above technical solution, further, the line scanning detection mechanism includes a ray light source and a TDI detection module, and when the object to be detected is inspected, the material support is located between the ray light source and the TDI detection module;

[0023] The supporting member comprises a bottom plate and two side plates connected to the bottom plate, and the bottom plate is provided with a through window.

[0024] In the above technical solution, further, the material supporting member is installed with an internal logistics line, and the internal logistics line is used to connect with the external logistics line arranged at the loading station and the unloading station.

[0025] The present application also provides a battery production line, including the defect detection device described in the above solution.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The defect detection device provided in this application uses a line-scanning detection mechanism to dynamically detect battery cells and uses line-scan integration to generate images, resulting in faster detection speeds and higher detection efficiency. When the width of a battery cell is fixed, its length is not restricted, allowing for detection of a wider range of battery cell types. Furthermore, the line-scanning detection imaging method can effectively reduce the distortion areas on both sides of the battery cell, thereby increasing the detection range.

[0028] The present application also provides a battery production line, including the defect detection device described in the above solution. Based on the above analysis, it can be seen that the battery production line also has the above beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 This is a schematic diagram of the first structure of the defect detection device provided by this application;

[0031] Figure 2 A second structural diagram of the defect detection device provided by this application;

[0032] Figure 3 This is a third structural diagram of the defect detection device provided by this application;

[0033] Figure 4 A first structural schematic diagram of the rotating tray provided in this application;

[0034] Figure 5 A second structural schematic diagram of the rotating tray provided in this application;

[0035] Figure 6 This is a third structural schematic diagram of the rotating tray provided in this application.

[0036] In the figure: 101-shell; 102-external logistics line; 103-line scanning detection mechanism; 104-loading station; 105-unloading station; 106-rotating tray; 107-material supporting piece; 108-cache station; 109-internal logistics line; 110-spacer; 111-rotating shaft; 112-tray body; 113-ray light source; 114-TDI detection module; 115-bottom plate; 116-side plate; 117-through window. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] Example 1

[0041] See also Figures 1 to 6 As shown, the defect detection device provided in this application can be used to detect internal defects of battery cells to reduce battery quality problems.

[0042] The defect detection device includes a housing 101, a transfer device, and a line-scanning detection mechanism 103. The transfer device is installed within the housing 101, which is equipped with a loading station 104 and an unloading station 105. The transfer device is used to transfer battery cells from the loading station 104 to the unloading station 105, forming a transfer path. The line-scanning detection mechanism 103 is installed within the housing 101 and is located on the transfer path, allowing the battery cells to pass through the line-scanning detection mechanism 103.

[0043] Specifically, the shell 101 is a lead room that prevents X-ray leakage. The lead room is provided with an imaging area, and the line scanning detection mechanism 103 is located in the imaging area. The line scanning detection mechanism 103 includes a ray light source 113 and a TDI detection module 114 that are spaced apart. The ray light source 113 is specifically a light tube that emits X-rays and is installed above the lead room. The TDI detection module 114 is specifically a TDI linear array detector and is installed below the lead room. The battery cells can be transported between the two so that the line scanning detection mechanism 103 can dynamically detect the battery cells. Compared with the area array detection device, both have the same point light source light tube, but the area array detector is replaced with a TDI linear array detector. The imaging is different from the direct imaging of the area array detector. TDI performs imaging by line scanning integration.

[0044] Preferably, the X-ray light source 113 is installed above the lead room through a movable bracket, and the TDI detection module 114 is installed below the lead room through a movable bracket. The movable bracket can enable the X-ray light source 113 and the TDI detection module 114 to move in three dimensions to achieve the purpose of compatibility with different types of battery cell detection.

[0045] When the entire system is in operation, the battery cell enters the lead chamber and then moves at a constant speed between the light tube and the TDI linear array detector. At the same moment, after the radiation emitted by the light tube passes through the battery cell, the remaining radiation reaches the TDI linear array detector, completing the image of the battery cell at that moment. Once the battery cell has completely passed through the imaging area, the images at each moment are integrated into the final image of the battery cell in the software system. The advantage of this imaging method is that its uniform motion is more efficient than the stepping motion of area array imaging. Furthermore, when the battery cell width is fixed, its length is not restricted. When inspecting large bare batteries, the battery cell can be transported along its length, eliminating the need for two imaging systems as required for area array imaging. Furthermore, compared to area array imaging, line scan imaging effectively reduces the distortion areas on both sides of the battery cell, thereby increasing the detection range.

[0046] In an optional solution of this embodiment, the transfer device includes a rotating tray 106 and a drive device. A plurality of supports 107 are arranged around the circumference of the rotating tray 106, and the supports 107 are used to support the battery cells. Preferably, the circumferential edge of the rotating tray 106 is aligned with the inner wall of the housing 101, so that the supports 107 and the inner wall of the housing 101 form an isolation chamber to isolate the battery cells.

[0047] Specifically, the support 107 includes a base plate 115 and two side plates 116 connected to the base plate 115. The base plate 115 and the side plates 116 are connected to form a cavity, and an opening is formed toward the housing 101. When the support 107 moves the battery cells to the imaging area, the base plate 115, the side plates 116, and the housing 101 form an isolated chamber, and the X-rays emitted by the radiation source 113 are not easily leaked. When the support 107 moves the battery cells to the loading station 104 and the unloading station 105, the battery cells can enter the cavity through the opening of the support 107. The base plate 115 is provided with a through window 117, so that light passing through the battery cells passes through the through window 117 and reaches the TDI linear array detector.

[0048] Furthermore, the imaging area is located between the loading station 104 and the unloading station 105. A drive mechanism is used to drive a rotating tray 106, allowing multiple support members 107 to flow between the loading station 104 and the unloading station 105. Battery cells can then enter the lead room from the loading station 104, then be transported to the imaging area for inspection, and finally be removed from the lead room at the unloading station 105, completing the assembly line process.

[0049] In an optional solution of this embodiment, at least one cache station 108 is provided on the transfer path; the line scanning detection mechanism 103 is located between the loading station 104 and the cache station 108, or the line scanning detection mechanism 103 is located between adjacent cache stations 108, or the line scanning detection mechanism 103 is located between the unloading station 105 and the cache station 108; the cache station 108 evenly divides the rotation angle corresponding to the transfer path to form a single step angle of the rotating tray 106.

[0050] Multiple material supports 107 circulating on the same transfer path form at least one transfer group. The number of material supports 107 constituting the transfer group is 2 more than the number of buffer stations 108 on the transfer path, and among the multiple material supports 107 in the transfer group, the angle between adjacent material supports 107 is a single step angle.

[0051] Optionally, the multiple support members 107 of the rotating tray 106 are evenly arranged, and the angle between adjacent support members 107 is a single step angle; a spacing area 110 is provided between adjacent support members 107, and the sector angle corresponding to the spacing area 110 is the same as the sector angle corresponding to the support member 107.

[0052] In this embodiment, see Figure 5 and Figure 6 As shown, one transfer group in the figure occupies the entire circumference of the rotating tray 106 . Figure 5 Two cache stations 108 are set between the middle loading station 104 and the cache station 108. The number of material supports 107 that make up the transfer group is 4. The angle between adjacent material supports 107 is 90 degrees. The sector angle corresponding to the spacing area 110 and the sector angle corresponding to the material support 107 are both 45 degrees. The single step angle of the rotating tray 106 is 90 degrees. Figure 6 A cache station 108 is set between the middle loading station 104 and the cache station 108. The number of material supports 107 that make up the transfer group is 3. The angle between adjacent material supports 107 is 120 degrees. The sector angle corresponding to the spacing area 110 and the sector angle corresponding to the material support 107 are both 60 degrees. The single step angle of the rotating tray 106 is 120 degrees.

[0053] When one of the supporting parts 107 moves to the loading station 104, the supporting part 107 at the end of the transfer path happens to move to the unloading station 105. At this time, the battery cells can be loaded from the loading station 104, and the battery cells after inspection can be unloaded synchronously from the unloading station 105. After loading, the supporting part 107 rotates once to the buffer station, and after unloading, the supporting part 107 rotates once to the loading station for loading, and the line scanning detection mechanism 103 can detect the battery cells during their movement. In this way, each rotation can achieve the loading, unloading and detection steps. Setting the buffer station 108 can increase the number of battery cells entering the lead room, thereby increasing the loading and unloading frequency of the battery cells and improving the detection efficiency.

[0054] In an optional solution of this embodiment, the defect detection device further includes a static detection mechanism, which is located at the buffer station 108 .

[0055] In this embodiment, during the loading and unloading process of the battery cells, the rotating tray 106 is stationary. Other static detection devices are provided at the buffer station 108. Static detection of the battery cells in the buffer station 108 is performed during the loading and unloading process, saving unnecessary time. Dynamic detection of the battery cells can be performed while the rotating tray 106 is rotating.

[0056] In an optional solution of this embodiment, at least one detection area is provided on the circumference of the rotating pallet 106; the number of detection areas is set corresponding to the number of transfer groups; any detection area is provided with a corresponding loading station 104, a buffer station 108, a line scanning detection mechanism 103 and an unloading station 105; the loading stations 104 and the unloading stations 105 of the multiple detection areas are alternately arranged along the rotation direction of the rotating pallet 106; the angle that the rotating pallet 106 rotates between the non-corresponding unloading station 105 and the loading station 104 is a single step angle.

[0057] In this embodiment, see Figure 4 As shown in the figure, there are two inspection areas (delimited by a dotted line), with two transfer groups located in each inspection area, evenly dividing the entire circumference of the rotating tray 106. This arrangement can double the inspection efficiency. Of course, the number of transfer groups needs to be set according to actual conditions and needs to meet the space requirements of the line scanning inspection mechanism 103 so that the rotating tray 106 can scan the entire battery cell with one rotation.

[0058] for Figure 4 Structurally, each transfer group is equipped with a buffer station 108. The number of supports 107 that make up one transfer group is three, and the number of supports 107 that make up two transfer groups is six. The six supports 107 are evenly arranged, and the angle between adjacent supports 107 is 60 degrees. The sector angle corresponding to the spacing area 110 and the sector angle corresponding to the supports 107 are both 30 degrees. After each 60-degree rotation of the rotating tray 106, the multiple supports 107 are moved to the corresponding functional area, which includes the loading station 104, the buffer station 108, and the unloading station 105. This allows the multiple supports 107 on the rotating tray 106 to synchronously perform the corresponding loading, unloading, and buffer detection steps.

[0059] In an optional solution of this embodiment, the rotating tray 106 includes a rotating shaft 111 and at least one tray body 112; a plurality of supporting members 107 are arranged circumferentially of the tray body 112; the rotating shaft 111 is connected to the rotation center of the tray body 112, and the rotating shaft 111 is connected to the driving device. The driving device is specifically a servo motor, which is used to drive the rotating shaft 111 and the tray body 112 to rotate periodically. When there are multiple tray bodies 112, the multiple tray bodies 112 are arranged at intervals along the length direction of the rotating shaft 111; the shell 101 is correspondingly provided with a loading station 104 and an unloading station 105 on the rotation path of each tray body 112. That is, the multiple tray bodies 112 rotate at different heights to detect the battery cells, and the number of detected battery cells is multiplied, which can further improve the detection efficiency.

[0060] Example 2

[0061] The defect detection device in this second embodiment is an improvement based on the above embodiment. The technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in this second embodiment.

[0062] In an optional solution of this embodiment, the material supporting member 107 is installed with an internal logistics line 109, and the internal logistics line 109 is used to connect with the external logistics line 102 set at the loading station 104 and the unloading station 105.

[0063] In this embodiment, the lead room is provided with multiple through-holes, corresponding to the loading station 104 and the unloading station 105, respectively. External logistics lines 102 are provided at the through-holes. When the support member 107 moves to the through-holes, the internal logistics line 109 docks with the external logistics line 102 to load and unload the battery cells. Optionally, the internal logistics line 109 is provided with a beam sensor and a limit block to ensure that the internal logistics line 109 and the external logistics line 102 are reliably docked and the battery cells can be limited to prevent the battery cells from falling from the support member 107.

[0064] Example 3

[0065] Embodiment 3 of the present application provides a battery production line, including a defect detection device of any of the above embodiments, and thus has all the beneficial technical effects of the defect detection device of any of the above embodiments, which will not be repeated here.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. In addition, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means that they are within the scope of the present application and form different embodiments.

Claims

1. A defect detection device, characterized in that: It comprises a housing (101), a transfer device and a line-scanning detection mechanism (103); The transfer device is installed in the housing (101), and the housing (101) is provided with a loading station (104) and a unloading station (105). The transfer device is used to transfer the object to be detected at the loading station (104) to the unloading station (105) to form a transfer path; The line-scanning detection mechanism (103) is installed in the housing (101) and is located on the transfer path, and the object to be detected can pass through the line-scanning detection mechanism (103).

2. The defect detection device according to claim 1, characterized in that The transfer device includes a rotating tray (106) and a driving device; A plurality of supporting members (107) are provided around the rotating tray (106), and the supporting members (107) are used to carry the object to be detected; the supporting members (107) and the inner wall of the housing (101) are arranged to form an isolation chamber; The driving device is used to drive the rotating tray (106) to rotate so that the plurality of material supporting members (107) can flow between the loading station (104) and the unloading station (105).

3. The defect detection device according to claim 2, characterized in that: At least one buffer station (108) is provided on the transfer path; the line scanning detection mechanism (103) is located between the loading station (104) and the buffer station (108), or the line scanning detection mechanism (103) is located between adjacent buffer stations (108), or the line scanning detection mechanism (103) is located between the unloading station (105) and the buffer station (108); the buffer station (108) evenly divides the rotation angle corresponding to the transfer path to form a single step angle of the rotating tray (106); The plurality of material supports (107) circulating on the same transfer path form at least one transfer group, the number of the material supports (107) constituting the transfer group is 2 more than the number of the buffer stations (108) on the transfer path, and among the plurality of material supports (107) in the transfer group, the angle between adjacent material supports (107) is the single step angle.

4. The defect detection device according to claim 3, characterized in that: It also includes a static detection mechanism, which is located at the cache station (108).

5. The defect detection device according to claim 3, characterized in that: The plurality of supporting members (107) of the rotating tray (106) are evenly arranged, and the angle between adjacent supporting members (107) is the single step angle; A spacing area (110) is provided between adjacent supporting members (107), and the sector angle corresponding to the spacing area (110) is the same as the sector angle corresponding to the supporting member (107).

6. The defect detection device according to claim 3, characterized in that: At least one detection area is provided on the circumference of the rotating tray (106); The number of the detection zones is set corresponding to the number of the transfer groups; Any of the detection areas is provided with the corresponding loading station (104), the buffer station (108), the line scanning detection mechanism (103) and the unloading station (105); the loading stations (104) and the unloading stations (105) of the multiple detection areas are alternately arranged along the rotation direction of the rotating tray (106).

7. The defect detection device according to claim 2, characterized in that: The rotating tray (106) includes a rotating shaft (111) and at least one tray body (112); A plurality of the material supporting members (107) are arranged around the tray body (112); the rotating shaft (111) is connected to the rotation center of the tray body (112), and the rotating shaft (111) is connected to the driving device; When there are multiple tray bodies (112), the multiple tray bodies (112) are spaced apart along the length direction of the rotating shaft (111); the shell (101) is correspondingly provided with the loading station (104) and the unloading station (105) on the rotation path of each tray body (112).

8. The defect detection device according to claim 2, characterized in that: The line scanning detection mechanism (103) includes a ray light source (113) and a TDI detection module (114); when the object to be detected is being detected, the material support (107) is located between the ray light source (113) and the TDI detection module (114); The supporting member (107) comprises a bottom plate (115) and two side plates (116) connected to the bottom plate (115), and the bottom plate (115) is provided with a through window (117).

9. The defect detection device according to claim 2, characterized in that: The supporting member (107) is equipped with an internal logistics line (109), and the internal logistics line (109) is used to connect with the external logistics line (102) provided at the loading station (104) and the unloading station (105).

10. A battery production line, characterized in that: Comprising the defect detection device according to any one of claims 1 to 9.

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