Pole piece detection device

Abstract

When the pole piece detection device is used for detecting the edge area of a pole piece, a first light source assembly is a low-angle light source, light emitted by the first light source assembly irradiates the edge area of the pole piece at a low angle, and if the detected surface of the edge area of the pole piece is flat, the first light source assembly can be used for detecting the edge area of the pole piece. The light reflected by the detection surface of the edge area of the pole piece cannot enter a visual detection part (a camera lens), and the image effect shows that the gray value is low; if the detected surface of the edge area of the pole piece has an uneven part, the light reflected by the uneven part enters a visual detection part (a camera lens), so that the image effect of the edge area at the uneven position can be seen clearly, and the gray value is relatively high. Therefore, whether the foil leakage phenomenon exists on the detected surface of the edge area of the pole piece or not can be judged, the foil leakage position on the surface of the edge area of the pole piece is lightened, the light reflection phenomenon is avoided, and the detection reliability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery detection technical field, concretely relates to a pole piece detection device. BACKGROUND

[0002] The pole piece is a key component of the battery and exists in various types of batteries. It is an important link for converting chemical energy into electrical energy. The quality of the pole piece directly affects the performance of the battery. Once there is a defect in the pole piece in the battery cell, such as a residual piece or a missing foil, it is easy to cause a major product safety hazard such as thermal runaway of the battery cell. Therefore, quality detection during the production of the pole piece is crucial, especially the missing foil phenomenon at the edge of the pole piece. It is very easy to miss detection using ordinary detection devices.

[0003] How to maximize the detection of whether there is a missing foil at the edge of the pole piece is one of the important problems that technicians in the field are concerned about. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a pole piece detection device with high reliability for detecting whether there is a missing foil at the edge of the pole piece.

[0005] The embodiments of the present application provide a pole piece detection device, which comprises a rack and a pole piece detection station, and the following components are arranged on the rack:

[0006] A first light source assembly, which is a low-angle light source, comprises a first light exit surface, which is a surface light source, and the first light exit surface is located on one side of the pole piece to be detected;

[0007] A visual detection component is located above the pole piece detection station and the first light exit surface, and the visual detection component is used to obtain the light reflected by the first light exit surface and the pole piece.

[0008] When the pole piece detection device of the present application detects the edge area of the pole piece, the first light source assembly is a low-angle light source, and the light emitted by the first light source assembly is low-angle irradiation to the edge area of the pole piece. If the detected surface of the edge area of the pole piece is flat, the light reflected by the detected surface of the edge area of the pole piece cannot enter the visual detection component (camera lens), and the image effect shows a low gray value. If the detected surface of the edge area of the pole piece has an uneven part, the light reflected by the uneven part will enter the visual detection component (camera lens), so that the edge area image effect of the uneven position can be seen, and the gray value is high. In this way, it can be judged whether there is a missing foil phenomenon in the detected surface of the edge area of the pole piece. This detection method can illuminate the missing foil position on the surface of the edge area of the pole piece without causing a reflection phenomenon, and the detection reliability is high. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 A structure schematic view of the pole piece welding device provided in an embodiment of the present application is shown in FIG. 1;

[0010] Figure 2 A front view of the pole piece welding device shown in FIG. 1 is shown in FIG. 2; Figure 1

[0011] Figure 3 A side view of the pole piece welding device shown in FIG. 1 is shown in FIG. 3; Figure 2

[0012] Figure 4 A structure schematic view of the mounting body in the pole piece welding device shown in FIG. 1 is shown in FIG. 4; Figure 1

[0013] A structure schematic view of the pole piece welding device provided in another embodiment of the present application is shown in FIG. 5; Figure 5

[0014] A structure schematic view of the pole piece welding device provided in yet another embodiment of the present application is shown in FIG. 6; Figure 6

[0015] A schematic view of the low-angle light source irradiating the pole piece provided in the present application is shown in FIG. 7. Figure 7

[0016] The reference signs in the accompanying drawings are explained as follows: Figures 1-7 1 frame; 11 vertical beam; 12 first cross beam; 13 second cross beam; 131 sliding groove; 4 second light source assembly; 41 second light exit surface; 42 housing; 43 connecting assembly; 431 first shaft; 432 second shaft; 433 mounting body; 4331 first through hole; 4332 second through hole; 4334 second mounting hole; 4335 first mounting hole; 434 mounting seat; 5 first light source assembly; 6 visual detection component; 7 second locking component; 8 first locking component;

[0017] 2 pole piece detection station;

[0018] 3 pole piece.

[0019] DETAILED DESCRIPTION

[0020] The present inventor has conducted a large amount of research on the current pole piece detection method, and found that the current pole piece surface is mainly illuminated by a light method, and the defects on the pole piece surface are detected by a visual system. However, the surface features of the residual piece are very similar to those of the pole piece, and the contrast of the ordinary light method is relatively small, and the outline edge is not clear, resulting in relatively low reliability of the pole piece surface detection.

[0021] ​​​The application provides an electrode piece detection device which can adjust the angle of light source incident to the electrode piece according to specific environment, and can improve the reliability of electrode piece quality detection. In order to enable those skilled in the art to better understand the technical solutions of the application, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0022] Please refer to Figures 1 to 7 , Figure 1 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 2 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 1 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 3 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 2 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 4 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 1 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 5 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 6 The application provides an electrode piece welding device structure diagram in an embodiment; Figure 7 The application provides a low-angle light source irradiation electrode piece diagram.

[0023] The application provides an electrode piece production system, which has a unwinding device, a receiving platform, a deviation rectifying platform, an electrode piece punching device, an electrode piece cutting device for slitting, a size detection device for detecting the size of the electrode piece, and a storage device. In different process stages, the electrode piece may have a defect problem, so the surface quality of the electrode piece 3 is detected as much as possible in different process stages of the electrode piece production, so that the electrode piece with defects can be reduced into the electrode piece process.

[0024] The application provides an electrode piece detection device suitable for electrode piece 2 detection in different stations of an electrode piece production system, for example, applied to a Z-stacking type cutting and stacking integrated machine. The electrode piece production system includes a transmission belt which can move in a predetermined direction under the drive of a motor and the like, and the electrode piece 2 is placed on the transmission belt and can move synchronously with the transmission belt. In this embodiment, the length direction of the electrode piece 2 is consistent with the conveying direction (the length direction of the transmission belt) of the transmission belt, and of course, the width direction of the electrode piece 2 is consistent with the conveying direction of the transmission belt in other embodiments. One or more electrode piece detection stations can be arranged along the movement path of the transmission belt. One electrode piece detection device is arranged in one electrode piece detection station, and one or more electrode piece detection devices can be arranged along the transmission direction of the transmission belt. The electrode piece detection station can be located in the process of the unwinding device, the receiving platform, the deviation rectifying platform, the electrode piece punching device, the electrode piece cutting device for slitting, the size detection device for detecting the size of the electrode piece, and the storage device.

[0025] In the embodiment of the present application, the pole piece detection device comprises a rack 1, a first light source assembly 5, a second light source assembly 4 and a visual detection component 6. The rack 1 is arranged near the conveying belt, and the rack 1 mainly serves to support other components in the pole piece detection device, such as the first light source assembly 5 and the visual detection component 6, which are both mounted on the rack 1. The first light source assembly 5, the second light source assembly 4 and the visual detection component 6 are all located above the conveying belt. The number of the first light source assembly 5, the number of the second light source assembly 4 and the number of the visual detection component 6 can all be one or several.

[0026] In the embodiment of the present application, the rack 1 can be made of metal material, such as iron material with relatively high strength or aluminum material with relatively light weight. Of course, the rack 1 can also be made of plastic with relatively high strength.

[0027] In the embodiment of the present application, a specific implementation of the rack 1 is given, which comprises two vertical beams 11 and a first cross beam 12 and a second cross beam 13 connected between the two vertical beams 11, and the height of the first cross beam 12 is higher than that of the second cross beam 13. In order to improve the use strength of the vertical beam 11, the vertical beam 11 can adopt a profile structure with a hollow structure. The rack 1 is generally in the form of a frame, has high support strength, and also saves material and has relatively low manufacturing cost. Of course, the structure of the rack 1 is not limited to the description in the present application, as long as it meets the use requirements of the application environment of the pole piece detection device.

[0028] In the embodiment of the present application, the first light source assembly 5 is a low-angle light source, and the so-called low-angle light refers to the angle of the light emitted by the light source assembly to the surface of the pole piece being less than 45°. The low-angle light source in the embodiment of the present application is a high-brightness linear light source. The first light source assembly 5 comprises a first light emitting surface, and the first light emitting surface is a surface light source, that is, the light emitting surface is in the form of a plane, such as a flat surface or a curved surface. When the light emitting surface of the surface light source is a plane, the structure is relatively simple, and the light emitting direction is basically consistent. The first light emitting surface is located on one side of the pole piece to be detected, please refer to Figure 1 For a rectangular pole piece 2, the pole piece 2 has four sides, two long sides and two short sides. The direction in which the two long sides extend is the first direction, that is, the length direction of the pole piece 2, and the direction in which the two short sides extend is the second direction, that is, the width direction of the pole piece 2.

[0029] The first light emitting surface 51 can be approximately rectangular, with a length of approximately 460mm to 540mm and a width of approximately 50mm to 70mm. In this way, the detection requirements of all current sizes of pole pieces can be met.

[0030] In the embodiment of the present application, the visual detection component 6 is located above the pole piece detection station 2, for example, the visual detection component 6 can be installed on the rack 1 and located above the pole piece detection station. The visual detection component 6 is used to obtain the light emitted by the first light exit surface 51 and reflected by the pole piece. The visual detection component 6 can be a camera, for example, a CCD (Charge Coupled Device) camera or a CMOS (Complementary Metal Oxide Semiconductor) camera. The CCD camera has good imaging effect, and the edge area of the pole piece can be accurately judged by the formed picture whether there are phenomena such as foil leakage, scratches, powder falling, bubbles and pits.

[0031] When the pole piece detection device of the present application detects the pole piece, the first light source assembly 5 is a low-angle light source, and the light emitted by the first light source assembly 5 is low-angle irradiated to the pole piece. If the detected surface of the edge area of the pole piece is flat, the light reflected by the edge area of the pole piece 2 cannot enter the visual detection component 6 (camera lens), and the image effect is low in gray value. If the detected surface of the edge area of the pole piece has uneven parts, the light reflected by the uneven parts will enter the visual detection component 6 (camera lens), so that the edge area image effect of the uneven position can be seen, and the gray value is high. In this way, it can be judged whether the detected surface of the pole piece has defects such as foil leakage. This detection means can illuminate the foil leakage position of the surface of the edge area of the pole piece without producing reflection phenomenon, and has high detection reliability.

[0032] In the embodiment of the present application, the pole piece 2 can be provided with the first light source assembly 5 at one side, or can be provided with the first light source assembly 5 at two or more sides. In the embodiment of the present application, the number of the first light source assembly 5 is at least two, and the first light source assembly 5 is arranged at at least two side positions of the pole piece 2, Figure 1 and Figure 2 It is shown that the pole piece 2 has the first light source assembly 5 at the opposite two sides, Figure 1 It is shown that the pole piece 2 has the first light source assembly 5 at the two sides arranged along the X direction, Figure 5 It is shown that the pole piece 2 has the first light source assembly 5 at the two sides arranged along the Y direction, that is, the first light source assembly 5 is arranged at the opposite sides of the pole piece 2. Figure 6 It is shown that the pole piece has the first light source assembly 5 at the four sides, that is, the pole piece 2 has the first light source assembly 5 at each side. Of course, the pole piece 2 can be provided with the first light source assembly 5 at only three sides. Wherein the length direction of the pole piece 2 can be parallel to the Y direction, and the width direction of the pole piece 2 is parallel to the X direction.

[0033] The more sides of the pole piece 2 are provided with the first light source assembly 5, the more easily the edge area of the pole piece 2 is covered by light, and the reliability of the detection of the detected surface of the pole piece is improved.

[0034] Figure 1 And Figure 5 In the above-mentioned embodiment, the first light source assembly 5 is arranged on the opposite side edges of the pole piece 2, so that the number of the first light source assembly 5 is relatively small, and the space occupied by the pole piece detection device is relatively small.

[0035] In the embodiment of the present application, the distance H1 between the first light exit surface 51 and the pole piece 2 in the vertical direction is in the range of 6mm to 15mm, such as 6mm, 7mm, 8mm, 9mm, 10mm or 15mm, etc. The distance between the first light exit surface and the pole piece in the vertical direction can also be any value in the above distance range. The distance between the first light exit surface 51 and the pole piece 2 in the horizontal direction is in the range of 50mm-100mm, such as 50mm, 60mm, 70mm, 80mm, 90mm or 100mm, etc. The distance between the first light exit surface 51 and the pole piece 2 in the horizontal direction can also be any value in the above distance range. When the first light exit surface 51 is located in the above height range and the horizontal distance from the pole piece 2 is in the above range, the exit light is more likely to cover the entire surface of the pole piece 2.

[0036] In the embodiment of the present application, the angle between the light emitted by the first light exit surface 51 and the surface of the pole piece 2 is in the range of 0° to 45°, such as 0°, 3°, 10°, 20°, 25°, 30°, 40° or 45°, etc. In one embodiment, the angle between the light emitted by the first light exit surface 51 and the surface of the pole piece is in the range of 3° to 20°, so that the difference in imaging gray scale between the flat surface and the uneven surface of the edge region of the pole piece 2 is larger, and it is easier to judge whether the edge region of the pole piece has a foil leakage phenomenon.

[0037] In the embodiment of the present application, the visual detection component 6 includes a camera, and the distance H2 between the lens of the camera and the pole piece 2 in the vertical direction is in the range of 300mm to 400mm. The height of the camera is at this position, which can better obtain the profile of the pole piece.

[0038] Because the surface features of the pole piece with foil leakage are very similar to the surface features of the qualified pole piece, the contrast of the ordinary lighting method is very small, and the profile edge is not clear. The pole piece detection device is further set as follows in the embodiment of the present application.

[0039] In the embodiment of the present application, the pole piece detection device further comprises a second light source assembly 4, and the position of the second light source assembly 4 is higher than that of the first light source assembly 5. The second light source assembly 4 comprises a second light emitting surface 41, which is a surface light source and is located above the pole piece. The second light source assembly 4 is a high-angle light source, that is, the angle between the emitted light of the second light source assembly 4 and the pole piece is greater than or equal to 45°. The height of the second light emitting surface from the pole piece ranges from 100 mm to 150 mm. The extension direction of the second light source assembly 4 can be along the long side of the pole piece.

[0040] The method can make the surface of the pole piece bright as a whole, highlight the edge profile of the residual piece, reduce the difficulty of the visual algorithm, and reduce the misjudgment rate.

[0041] The second light emitting surface 41 can also be approximately rectangular, with a length ranging from 460 mm to 540 mm, such as 460 mm, 470 mm, 500 mm, 520 mm, or 540 mm, etc. The width ranges from 50 mm to 70 mm, such as 50 mm, 55 mm, 60 mm, 65 mm, or 70 mm. Of course, the size of the second light emitting surface 41 is not limited to the values listed herein, but can be any value within the above specific range.

[0042] In the embodiment of the present application, the second light emitting surface 41 is rotatably installed on the rack 1 to adjust the incident angle of the light incident on the pole piece. The rotation axis of the second light emitting surface 41 is parallel to the surface on which the pole piece is located. By adjusting the position of the second light emitting surface 41, a better imaging field of view can be obtained, which is beneficial to image analysis.

[0043] In the embodiment of the present application, the second light source assembly 4 comprises at least one connecting assembly 43, which comprises a first shaft 431 connected to the rack 1. The first shaft 431 extends in a first direction, and the second light emitting surface is rotatably installed on the first shaft 431 and can rotate around the first shaft 431. Specifically, the housing 42 fixedly connected with the second light emitting surface 41 is rotatably installed on the first shaft 431. The first direction is parallel to the length direction of the pole piece. The rotatable connection of the second light emitting surface to the first shaft 431 is simple in structure and convenient for adjustment and locking. Specifically, one end of the first shaft 431 can be provided with a mounting seat 434 which can slide along the sliding groove 131 of the cross beam.

[0044] In the embodiment of the present application, the connecting assembly 43 further comprises a mounting body 433, the mounting body 433 is provided with a first through hole 4331, the peripheral wall surrounding the first through hole 4331 is provided with a first opening, the first through hole 4331 is sleeved on the first shaft 431, and the first opening is provided with a first locking component 8 for locking the mounting body 433 and the first shaft 431. The first locking component 8 can be a bolt or a buckle or a pin-bolt or the like mechanical component. Figure 4 In the embodiment of the present application, the first locking component 8 is a bolt, the mounting body 433 is provided with a first mounting hole 4335, and the first locking component 8 is located inside the first mounting hole 4335. The first locking component 8 can apply a force to the two side walls forming the first opening to reduce the size of the first opening, thereby controlling the size of the first through hole 4331 to realize the interference fit between the first through hole 4331 and the first shaft 431, and thereby positionally lock the mounting body 433 and the first shaft 431. When the locking component does not apply a force to the two side walls forming the opening, the size of the first through hole 4331 is relatively large, so that the diameter of the first through hole 4331 can be greater than the outer diameter of the first shaft 431, and the mounting body 433 can rotate relative to the first shaft 431 to adjust the angular position of the second light emitting surface 41.

[0045] In the embodiment of the present application, the connecting assembly 43 further comprises a second shaft 432, the mounting body 433 is provided with a second through hole 4332, the peripheral wall surrounding the second through hole 4332 is provided with a second opening, the second through hole 4332 is sleeved on the second shaft 432 and can rotate relative to the second shaft 432, and the second opening is provided with a second locking component 7 for locking the mounting body 433 and the second shaft 432. The second locking component 7 can be a bolt or a buckle or a pin-bolt or the like mechanical component. Figure 4 In the embodiment of the present application, the second locking component 7 is a bolt, the mounting body 433 is provided with a second mounting hole 4334, and the second locking component 7 is located inside the second mounting hole 4334. The adjustment of the position of the mounting body 433 and the second shaft 432 can refer to the description of the adjustment of the position of the mounting body 433 and the first shaft 431, which will not be described here.

[0046] In the embodiment of the present application, the rack 1 comprises a cross beam, which is defined as a second cross beam 13 in the present application, and the two sides of the second cross beam 13 are provided with connecting assemblies 43, and the two first shafts 431 in the two connecting assemblies 43 are coaxial and are connected with the cross beam along the second direction. In this way, the assembly of various components in the pole piece detection device is relatively convenient.

[0047] In the embodiment of the present application, the number of the second light source assemblies 4 is two, the visual detection component 6 comprises two cameras, the two cameras are located at the intermediate positions of the two second light source assemblies 4, and the arrangement direction of the two cameras has an included angle with the arrangement direction of the two second light source assemblies 4. This arrangement avoids the shielding of the second light source assemblies 4 to the light reflected by the pole piece, and is conducive to the complete entry of the light reflected by the pole piece into the cameras.

[0048] Please refer to Figure 1 In the embodiments of the present application, the number of the first light source assemblies is two, the two first light source assemblies 5 are respectively located at opposite sides of the pole piece 2, and the first light source assemblies 5 extend along a first direction, the number of the second light source assemblies 4 is two, the two second light source assemblies 4 are arranged at intervals along the first direction, and the two second light source assemblies 4 extend along a second direction. The first direction is parallel to the length direction of the pole piece, and the second direction is parallel to the width direction of the pole piece.

[0049] In this embodiment, the pole piece detection device has a simple structure and is suitable for an environment in which the space of the pole piece detection station is limited.

[0050] Of course, the two first light source assemblies 5 can also be respectively located at two short sides of the pole piece 2, and the second light source assemblies 4 extend along the long side of the pole piece 2.

[0051] For other structures of the pole piece production system, please refer to the prior art, and no further description is made herein.

[0052] In the description of the embodiments of the present application, the terms “first”, “second” and the like are only used for the convenience of describing structures and / or functions that are the same or similar to two or more structures or components, and do not represent a certain special limitation on order and / or importance.

[0053] In the description of the embodiments of the present application, the terms “including”, “containing” or any other variants thereof are intended to cover non-exclusive containing, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0054] The above is only the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An electrode testing device, characterized in that, It includes a frame (1) and an electrode testing station, and the frame (1) is provided with the following components: The first light source assembly (5) is a low-angle light source. The first light source assembly (5) includes a first light emission surface (51), which is a surface light source. The first light emission surface (51) is located on one side of the electrode to be tested (2). A visual inspection component (6) is located above the electrode inspection station. The visual inspection component (6) is used to acquire the light emitted by the first light emitting surface (51) and reflected by the electrode (2).

2. The electrode testing device according to claim 1, characterized in that, The number of the first light source components (5) is at least two, and the first light source components (5) are provided on at least two sides of the electrode (2).

3. The electrode testing device according to claim 2, characterized in that, The electrode includes two sets of opposing sides, and the first light source component (5) is disposed at at least one set of the opposing sides.

4. The electrode testing device according to any one of claims 1 to 3, characterized in that, The vertical distance between the first light emitting surface (51) and the electrode is 6mm to 15mm, and the horizontal distance between the first light emitting surface (51) and the electrode is 50mm to 100mm.

5. The electrode testing device according to any one of claims 1 to 3, characterized in that, The angle between the light emitted from the first light-emitting surface (51) and the surface of the electrode is in the range of 0° to 45°.

6. The electrode testing device according to claim 5, characterized in that, The angle between the light emitted from the first light-emitting surface (51) and the surface of the electrode is in the range of 3° to 20°.

7. The electrode testing device according to any one of claims 1 to 3, characterized in that, It also includes a second light source component (4), and the position of the second light source component (4) is higher than that of the first light source component (5). The second light source component (4) is a high-angle light source. The second light source component (4) includes a second light emission surface (41), which is a surface light source and is located above the electrode.

8. The electrode testing device according to claim 7, characterized in that, The number of the second light source components (4) is two, and the visual detection component (6) includes two cameras. The two cameras are located in the middle of the two second light source components (4), and the arrangement direction of the two cameras is at an angle to the arrangement direction of the two second light source components (4).

9. The electrode testing device according to claim 7, characterized in that, The number of the first light source components is two, the first light source component (5) extends along the first direction, the number of the second light source components (4) is two, the two second light source components (4) are arranged at intervals along the first direction, and the second light source components (4) extend along the second direction.

10. The electrode testing device according to claim 9, characterized in that, The first direction is parallel to the length direction of the electrode, and the second direction is parallel to the width direction of the electrode (2).

Images