A lithium battery pole piece cutting burr detection device and detection method

Abstract

The present invention proposes a lithium battery pole piece slitting burr detection device and detection method, comprising a fixed side plate and a roller assembly, the roller assembly being rotatably mounted on the fixed side plate, the roller assembly comprising a first drive roller, a second drive roller, and at least one tension roller; a burr detection assembly and a pole piece buffer assembly; wherein the burr detection assembly is located between the first drive roller and the tension roller, and is used to detect burrs on both sides of the pole piece passing through the first drive roller; the pole piece buffer assembly is disposed below the tension roller and can move up and down relative to the fixed side plate, and comprises a mounting plate and at least one floating roller rotatably mounted on the mounting plate. The slit pole piece passes through the first drive roller, the burr detection assembly, the tension roller, the floating roller, and the second drive roller in sequence and is connected to a winding mechanism. The present invention can meet the requirements of online pole piece burr detection, eliminates the need to invest in expensive hardware and software in industrial cameras, reduces production costs, and has high applicability and economy.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery detection, and in particular to a device and method for detecting burrs on lithium battery pole pieces. Background Art

[0002] In lithium battery production equipment, electrode slitting machines are prone to burrs when slitting copper or aluminum foil electrodes. When these burred lithium battery electrodes are used in batteries, the burrs can puncture the separator, causing the battery to short-circuit and become scrapped, and even create safety issues. Therefore, burr detection in lithium-ion battery electrodes is crucial.

[0003] Existing methods for detecting burrs on lithium battery pole pieces typically use industrial cameras to capture images of the pole piece edges, followed by detection algorithms. However, due to limitations in the frame rate and sampling accuracy of industrial cameras, these methods cannot meet the requirements for high-speed and high-precision burr detection. The slit pole pieces are reeled at high speed by a reeling mechanism, which operates at the same speed as the slitting mechanism. Under high-speed slitting conditions and with very small burr sizes, existing detection technologies cannot meet production requirements.

[0004] A Chinese patent with publication number CN113313713B discloses a method and system for online detection of burrs on lithium battery pole pieces. The method uses an array industrial camera with an extremely short exposure time, an extremely bright light source, and a telecentric lens with a large depth of field and high magnification. The system designs a method for selecting and arranging the camera, lens, and light source. By calculating and setting camera parameters, the acquisition frame rate is increased exponentially. A burr detection algorithm based on image projection analysis, combined with autofocus, enables high-speed online detection of pole piece burrs. Although the above-mentioned existing technical solutions can meet the requirements of high-precision online burr detection, they are essentially technical improvements on industrial cameras. They require customized development of high-performance cameras, as well as the construction of relatively complex detection algorithms in conjunction with the cameras. The hardware and software supporting investments are excessive, which undoubtedly leads to excessively high costs for detection devices during pole piece production, making them less applicable and economical. Summary of the Invention

[0005] In view of this, the present invention proposes a lithium battery pole piece cutting burr detection device and detection method to solve the problem that in the high-speed and high-precision burr detection process, the lithium battery pole piece cutting burr detection device in the existing technology requires customized development of high-performance cameras, the production cost is too high, and it does not have high applicability and economy.

[0006] The technical solution of the present invention is achieved as follows:

[0007] In one aspect, the present invention provides a lithium battery pole piece slitting burr detection device, the burr detection device comprising a fixed side plate and a roller assembly, the roller assembly being rotatably disposed on the fixed side plate;

[0008] The roller assembly includes a first transmission roller, a second transmission roller and at least one tension roller, wherein the at least one tension roller is located between the first transmission roller and the second transmission roller;

[0009] The burr detection device further includes a burr detection component and a pole piece buffer component; wherein the burr detection component is located between the first transmission roller and the tension roller;

[0010] The pole piece buffer assembly includes a mounting plate and at least one floating roller. The mounting plate is slidably arranged on the fixed side plate below the tension roller and can move up and down relative to the fixed side plate. At least one floating roller is rotatably arranged on the mounting plate. The slit pole piece passes around the first transmission roller, the burr detection assembly, the tension roller, the floating roller and the second transmission roller in sequence and is connected to the winding mechanism.

[0011] Based on the above technical solution, preferably, the first transmission roller and the second transmission roller are both provided with a rotary encoder for obtaining the pole piece position information, and the rotary encoder is installed at one end of the first transmission roller and the second transmission roller away from the fixed side plate to confirm the tape length of the pole piece.

[0012] Furthermore, preferably, positioning sensors are provided above the first transmission roller and the second transmission roller, and the positioning sensors are used to detect the identification holes on the pole pieces.

[0013] On the basis of the above technical solution, preferably, the burr detection assembly includes a fixed shaft, a detection roller and a camera unit. The fixed shaft is fixedly arranged on the fixed side plate and is parallel to the roller assembly. The detection roller is rotatably arranged on the fixed shaft for allowing the pole piece to pass through its outer peripheral surface. The camera unit is symmetrically arranged in two groups, which are respectively fixed on the fixed shaft on both sides of the detection roller, and are used to capture images of the edges on both sides of the pole piece passing on the detection roller.

[0014] Furthermore, preferably, thinning areas which are non-contacting with the edge surface of the pole piece are respectively provided on the outer peripheral walls at both ends in the length direction of the detection roller.

[0015] On the basis of the above technical solution, preferably, the burr detection component corresponds to a middle position between the tension roller and the floating roller in the horizontal direction.

[0016] On the basis of the above technical solution, preferably, the burr detection device also includes the marking component fixedly mounted on the fixed side plate, the marking component is located below the side of the second transmission roller away from the tension roller, the marking component includes a marking machine, a first follower roller and a second follower roller, the first follower roller and the second follower roller are arranged at intervals on the fixed side plate and are rotatably connected to the fixed side plate, the marking machine is located above the second follower roller and is fixedly connected to the fixed side plate, the pole piece conveyed by the second transmission roller bypasses the first follower roller and the second follower roller in turn and is connected to the winding mechanism, and the marking machine is used to mark the defective pole piece passing through the second follower roller.

[0017] Furthermore, preferably, a first sensing element and a second sensing element are fixedly provided on the marking machine respectively, the first sensing element is used to detect the marking paper on the marking machine, and the second sensing element is used to detect whether the labeling of the defective electrode is successful or not.

[0018] On the other hand, the present invention also discloses a method for detecting burrs in lithium battery pole piece cutting, comprising the following steps:

[0019] S1, the slit electrode sheet is passed through the first transmission roller, the burr detection assembly, the tension roller, the floating roller, the second transmission roller, the first follower roller and the second follower roller in sequence and connected to the winding mechanism;

[0020] S2. When the rotary encoder records a certain length of the pole piece tape, the burr detection component is triggered to detect the edge of the pole piece, and the speed of the pole piece tape after slitting is reduced. When the winding speed remains unchanged, the pole piece tape is buffered by the pole piece buffer component;

[0021] S3, marking the electrode area after cutting by positioning sensor, and associating the electrode burr defect area with the corresponding electrode segment;

[0022] S4. When the burr detection of the corresponding electrode area exceeds the standard, the electrode area passes through the second follower roller and is labeled as a defective electrode by the marking machine.

[0023] The present invention has the following beneficial effects compared to the prior art:

[0024] (1) The lithium battery electrode slitting burr detection device disclosed in the present invention is characterized in that a electrode buffer assembly is movably arranged on a fixed side plate below a tension roller, and a burr detection assembly is arranged between a first transmission roller and a tension roller. When the electrode is reeled after slitting, the slitting electrode is passed through the first transmission roller, the burr detection assembly, the tension roller, the floating roller and the second transmission roller in sequence and connected to the reeling mechanism. When the electrode is conveyed for a certain length, the burr detection assembly detects the edge of the electrode and reduces the conveying speed of the electrode after slitting. At this time, the reeling mechanism keeps the reeling speed of the electrode unchanged. When the reeling speed is greater than the conveying speed of the slitting electrode, the electrode pulls the floating roller toward the tension roller under the action of the tension roller, so that the electrode is in a floating tensioned state when conveyed on the burr detection device. At this time, the speed of the electrode is reduced when passing through the burr detection assembly. By configuring a low-performance industrial camera for the burr detection assembly, the electrode can be satisfied with online burr detection without investing in expensive hardware and software on the industrial camera, thereby reducing production costs and having high applicability and economy.

[0025] (2) Through the cooperation of the rotary encoder and the positioning sensor, the segmented pole pieces can be marked, and the pole piece burr detection area and the corresponding pole piece can be bound to facilitate the rapid acquisition of the pole piece burr defective segment, and the pole piece defective product can be labeled using the marking component to isolate the corresponding defective pole piece segment;

[0026] (3) Thinning areas that are not in contact with the edge surface of the pole piece are provided on the outer peripheral walls at both ends of the detection roller in the longitudinal direction, which facilitates imaging observation by the camera unit and avoids the detection roller from contacting the edge of the pole piece for a long time to generate dirt that interferes with the imaging of the camera unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the lithium battery pole piece cutting burr detection device disclosed in the present invention;

[0029] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0030] Figure 3 This is a schematic diagram of the planar structure of the lithium battery pole piece cutting burr detection device disclosed in the present invention;

[0031] Figure ID:

[0032] 1. Fixed side plate; 2. Roller assembly; 21. First drive roller; 22. Second drive roller; 23. Tension roller; 3. Burr detection assembly; 4. Pole piece buffer assembly; 41. Mounting plate; 42. Floating roller; 5. Rotary encoder; 6. Positioning sensor; 31. Fixed shaft; 32. Detection roller; 33. Camera unit; 321. Thinning area; 7. Marking assembly; 71. Marking machine; 72. First follower roller; 73. Second follower roller; 711. First sensing element; 712. Second sensing element. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, combined Figure 2-3 The present invention discloses a device for detecting burrs during slitting of lithium battery pole pieces. In actual use, the device is fixed between a slitting mechanism and a reeling mechanism. It receives the pole pieces cut by the slitting mechanism, performs burr detection, and then is reeled up by the reeling mechanism.

[0035] The burr detection device of this embodiment includes a fixed side plate 1 and a roller assembly 2. The fixed side plate 1 is vertically fixed between the slitting mechanism and the winding mechanism. The roller assembly 2 is rotatably mounted on the fixed side plate 1 and is used to roll the slit electrode. Specifically, the slit electrode is conveyed on the roller assembly 2 and then reeled by the winding mechanism. The slitting mechanism and the reeling mechanism involved in this embodiment are both conventional equipment in the prior art.

[0036] The roller assembly 2 of this embodiment includes a first transmission roller 21 , a second transmission roller 22 and at least one tension roller 23 . The at least one tension roller 23 is located between the first transmission roller 21 and the second transmission roller 22 .

[0037] The first transmission roller 21 is used to receive and transport the slit electrode sheets. The at least one tension roller 23 is used to receive the electrode sheets transmitted from the first transmission roller 21 and provide tension to the electrode sheets. In order to flatten and tension the electrode sheets during tape transport, multiple tension rollers 23 are provided in this embodiment, and the multiple tension rollers 23 are arranged horizontally at intervals. The second transmission roller 22 is used to transport the electrode sheets to the winding mechanism. It should be noted that the first transmission roller 21, the second transmission roller 22, and the at least one tension roller 23 are parallel to each other and all rotate passively.

[0038] In order to detect the burrs on the electrode after slitting, an industrial camera is usually installed during the winding and tape-feeding process of the electrode after slitting to obtain the burr image and make a judgment through an algorithm. However, in the electrode production process, the winding mechanism and the slitting mechanism are in high-speed operation. The frame rate and sampling accuracy of ordinary industrial cameras are limited and cannot meet production needs. In order to solve this problem, existing technologies often use technical improvements on industrial cameras, develop high-performance cameras through customization, and build more complex detection algorithms with cameras to achieve high-speed online detection of electrode burrs. As a result, the investment in supporting hardware and software of industrial cameras is too large, which will undoubtedly lead to excessive cost of detection equipment in the electrode production process, which is not highly applicable and economical.

[0039] To this end, the burr detection device of this embodiment is further provided with a burr detection component 3 and a pole piece buffer component 4 to solve the problems existing in the prior art.

[0040] Specifically, the burr detection assembly 3 is located between the first transmission roller 21 and the tension roller 23 group, and is used to detect burrs on both sides of the pole piece passing through the first transmission roller 21.

[0041] In this embodiment, as some preferred implementations, the burr detection assembly 3 includes a fixed shaft 31, a detection roller 32, and a camera unit 33. The fixed shaft 31 is fixedly mounted on the fixed side plate 1 and parallel to the roller assembly 2. The detection roller 32 is rotatably mounted on the fixed shaft 31, for the electrode to pass over its outer circumference. Two sets of camera units 33 are symmetrically arranged, fixed to the fixed shaft 31 on either side of the detection roller 32, for capturing images of both edges of the electrode passing over the detection roller 32. In actual use, the slitting mechanism conveys the slit electrode over the first transmission roller, around the detection roller 32, around the tension roller 23, and finally via the second transmission roller to the winding mechanism. As the electrode passes over the detection roller 32 during the tape feeding process, the camera units 33 at both ends of the detection roller 32 capture an image. The captured image is then used by a software algorithm to determine whether the electrode edge burrs meet the standards. The camera units 33 in this embodiment utilize industrial cameras, which can be area array cameras or other cameras.

[0042] Since the slitting mechanism and the winding mechanism run at high speed, the pole piece travels at high speed on the detection roller 32. The frame rate and sampling accuracy of the industrial camera are limited and cannot meet the requirements of normal image capture. In order not to affect the high-speed winding operation of the winding mechanism, this embodiment sets the pole piece buffer assembly 4 floating on the fixed side plate 1 below the tension roller 23.

[0043] The electrode buffer assembly 4 includes a mounting plate 41 and at least one floating roller 42. The mounting plate 41 is slidably mounted on the fixed side plate 1 below the tension roller 23 and can move up and down relative to the fixed side plate 1. The at least one floating roller 42 is rotatably mounted on the mounting plate 41. The slit electrode sheet passes through the first transmission roller 21, the detection roller 32, the tension roller 23, the floating roller 42, and the second transmission roller 22 in sequence, and is connected to the winding mechanism. In some preferred embodiments, the number of floating rollers 42 in this embodiment matches the number of tension rollers 23. The electrode sheet passes from the top surface of the first transmission roller 21, downward around the bottom surface of the detection roller 32, then around the top surface of the tension roller 23, downward around the bottom surface of the floating roller 42, and then around multiple sets of corresponding tension rollers 23 and floating rollers 42 in sequence, and finally around the top surface of the second transmission roller 22, and is connected to the winding mechanism. By providing multiple sets of corresponding tension rollers 23 and floating rollers 42, floating tension can be achieved as the electrode sheet passes through the rollers, and the electrode sheet travel speed can be easily controlled.

[0044] By adopting the above technical solution, when the electrode is conveyed for a certain length, the control system triggers the burr detection component 3 to detect the edge of the electrode, and at the same time reduces the conveying speed of the electrode after slitting. At this time, the winding mechanism keeps the winding speed of the electrode unchanged. When the winding speed is greater than the conveying speed of the slitting electrode, the winding mechanism pulls the electrode, causing the electrode to pull the floating roller 42 and approach the tension roller 23 under the action of the tension roller 23, so that the electrode is in a floating tensioned state when conveyed on the detection roller 32. At this time, the speed of the electrode is reduced when it is on the detection roller 32. By configuring a low-performance industrial camera, the online burr detection of the electrode can be met, without investing in expensive hardware and software on the industrial camera, thereby reducing production costs. When the camera unit 33 completes the burr detection, the slitting mechanism increases its speed. At this time, the pole piece's tape running speed on the detection roller 32 is accelerated, and the floating roller 42 presses the pole piece down under the action of gravity, causing the pole piece buffer assembly 4 to fall to its initial position, thereby ensuring the normal tape running and winding of the pole piece after slitting, reducing the impact on the slitting and winding efficiency, and at the same time, a low-performance industrial camera can be used to complete the pole piece edge burr detection, which has high applicability and economy.

[0045] In order to obtain the length of the pole piece tape, in this embodiment, a rotary encoder 5 for obtaining the pole piece position information is provided on both the first transmission roller 21 and the second transmission roller 22. The rotary encoder 5 is installed at one end of the first transmission roller 21 and the second transmission roller 22 away from the fixed side plate 1 to confirm the tape length of the pole piece. After obtaining a certain length of the pole piece tape, the rotary encoder 5 on the first transmission roller 21 can feed back the signal to the control system, such as a PLC, and the control system triggers the slitting mechanism to decelerate, and at the same time, the control system triggers the camera unit 33 to work. The rotary encoder 5 on the second transmission roller 22 is used to obtain the pole piece tape length between the first transmission roller 21 and the second transmission roller 22. Since the pole piece length between the two transmission rollers is in a real-time changing state, the pole piece tape length can be accurately located by the rotary encoder 5 on the first transmission roller 21 and the second transmission roller 22. At the same time, when the pole piece travels a certain length, the rotary encoder 5 on the first transmission roller 21 will trigger the camera unit to take pictures, that is, when the pole piece travels a certain length, the camera unit collects the pole piece image once and determines whether there is a burr defect through the system algorithm. The collection interval length is less than the pole piece travel length between the first transmission roller 21 and the second transmission roller 22. Therefore, through the two rotary encoders, the pole piece interval where the pole piece burr defect is located can be known.

[0046] To accurately determine which pole piece segment of the strip pole piece contains a defective burr, this embodiment provides positioning sensors 6 above both the first drive roller 21 and the second drive roller 22. These sensors are used to detect the identification holes on the pole piece. When the slit pole piece passes through the first drive roller 21, the positioning sensor 6 above the first drive roller 21 identifies the first identification hole on the pole piece. Simultaneously, the rotary encoder on the first drive roller 21 triggers the camera unit to capture images after the tape has traveled a certain length. When the pole piece passes through the second drive roller 22, the positioning sensor 6 on the second drive roller 22 detects the first identification hole, and the positioning sensor 6 above the first drive roller 21 detects the second identification hole adjacent to the first identification hole. The two positioning sensors 6 correlate with each other, allowing the corresponding pole piece to be identified as a complete tape-wound pole piece. If a burr is present within this pole piece, the defective pole piece can be identified by a marking mechanism during the subsequent winding process.

[0047] Based on the above technical solution, thinned areas 321 are respectively provided on the outer peripheral walls at both ends of the length direction of the detection roller 32, which are non-contact with the edge surface of the electrode. Specifically, the diameter of the thinned areas 321 is smaller than the diameter of the detection roller 32, and the width of the thinned areas 321 is 1mm-5mm. This configuration facilitates imaging observation by the camera unit 33 and prevents contamination caused by the detection roller 32 contacting the electrode edge for a long time, which could interfere with the imaging of the camera unit 33.

[0048] In some preferred embodiments, the burr detection assembly 3 is horizontally aligned with the center of the tension roller 23 and the floating roller 42. This arrangement facilitates the pole piece to pass around the bottom of the detection roller 32 and then pass around the top of the tension roller 23, ensuring that the entire pole piece is always in a tensioned state during the tape running process.

[0049] After completing the electrode burr detection, when the electrode burrs do not meet the standards, the defective electrode segments need to be isolated and marked to prevent the defective electrodes from being made into batteries during subsequent winding, resulting in defective batteries.

[0050] To this end, this embodiment further includes a marking assembly 7 fixedly mounted on the fixed side plate 1. The marking assembly 7 is located below the second transmission roller 22 on a side away from the tension roller 23. The marking assembly 7 includes a marking machine 71, a first follower roller 72, and a second follower roller 73. The first follower roller 72 and the second follower roller 73 are spaced apart on the fixed side plate 1 and rotatably connected to the fixed side plate 1. The marking machine 71 is located above the second follower roller 73 and fixedly connected to the fixed side plate 1. The electrode sheet conveyed by the second transmission roller 22 passes around the first follower roller 72 and the second follower roller 73 in sequence and is connected to the winding mechanism. The marking machine 71 is used to mark defective electrode sheets that pass through the second follower roller 73. In this embodiment, the first follower roller 72 and the second follower roller 73 are spaced apart. This not only allows tensioning of the electrode sheet, but also allows the electrode sheet to be flattened, making it easier to apply marking paper.

[0051] When the camera unit 33 obtains the edge image of the electrode, the system algorithm is used to determine whether the burr is marked. Usually, if the length of the burr is greater than half the thickness of the electrode, the burr is judged to be unqualified. When the system determines that the burr on the electrode does not meet the standard, the electrode passes through the second follower roller 73, and the marking machine 71 sticks the defective product label paper to the surface of the electrode. The marking machine 71 is connected to the control system and receives the control signal of the control system.

[0052] Specifically, when the equipment is working, the cut electrode piece is conveyed on the first transmission roller, and the rotary encoder starts to record the length of the material belt and triggers the camera unit to take pictures to detect the burrs on the cutting edges of the electrode piece. When the camera unit detects that the burrs exceed the standard, the electrode piece continues to move forward. When the positioning sensor 6 on the first transmission roller 21 and the positioning sensor on the second transmission roller 22 cooperate with each other to determine the corresponding electrode segment, if the burrs in the electrode area detected in the electrode segment exceed the standard, the system triggers the defective electrode segment to move to the appropriate position and be labeled as a defective product by the marking machine.

[0053] Specifically, there is a certain running distance between the second transmission roller 22 and the second follower roller 73. Therefore, when the two positioning sensors 6 distinguish the corresponding pole segment and there are burrs in the pole segment, the marking machine receives the system feedback signal to perform marking. At this time, the rotary encoder on the second transmission roller 22 can feed back the signal to the marking machine when the pole segment runs a certain length. After the defective pole segment walks onto the second follower roller 73, the marking machine performs the labeling paper operation to avoid the marking machine labeling in advance and sticking it to the previous pole segment, causing labeling errors.

[0054] It is worth noting that in this embodiment, the rotary encoder and positioning sensor on the second drive roller can also serve two purposes: 1. Precisely locate the marking position of the marking machine to avoid inaccurate positioning caused by the electrode buffer assembly. 2. Prevent the failure of the length of the electrode fragment in the buffer area during actual operation. After reconnecting the tape, the rotary encoder and positioning sensor on the second drive roller can relocate the position of the defective electrode fragment, ensuring accurate labeling.

[0055] As some preferred embodiments, the marking machine 71 is respectively fixed with a first sensing element 711 and a second sensing element 712. The first sensing element 711 is used to detect the marking paper on the marking machine 71. When the marking machine 71 is out of paper, a signal will be sent to the control system to prompt the control system to add marking paper. The second sensing element 712 is used to detect whether the labeling of defective electrodes is successful or not.

[0056] The present invention also discloses a method for detecting burrs during lithium battery pole piece cutting, which comprises the following steps:

[0057] S1. The slit electrode sheet is passed through the first transmission roller 21, the burr detection assembly 3, the tension roller 23, the floating roller 42, the second transmission roller 22, the first follower roller 72 and the second follower roller 73 in sequence and connected to the winding mechanism;

[0058] S2. When the rotary encoder 5 records a certain length of the pole piece tape, the burr detection component 3 is triggered to detect the edge of the pole piece, and the speed of the pole piece tape after slitting is reduced. When the winding speed remains unchanged, the pole piece tape is buffered by the pole piece buffer component 4;

[0059] S3, marking the electrode area after cutting by positioning sensor 6, and associating the electrode burr defect area with the corresponding electrode segment;

[0060] S4. When the burr detection of the corresponding electrode segment exceeds the standard, the electrode segment area is labeled as defective by the marking machine 71 when the electrode segment passes through the second follower roller 73.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lithium battery pole piece slitting burr detection device, the burr detection device comprising a fixed side plate (1) and a roller assembly (2), the roller assembly (2) being rotatably disposed on the fixed side plate (1); Its characteristics are: The roller assembly (2) comprises a first transmission roller (21), a second transmission roller (22) and at least one tension roller (23), wherein the at least one tension roller (23) is located between the first transmission roller (21) and the second transmission roller (22); The burr detection device further comprises a burr detection component (3) and a pole piece buffer component (4); wherein the burr detection component (3) is located between the first transmission roller (21) and the tension roller (23); The pole piece buffer assembly (4) includes a mounting plate (41) and at least one floating roller (42), wherein the mounting plate (41) is slidably arranged on the fixed side plate (1) below the tension roller (23) and can move up and down relative to the fixed side plate (1), and at least one floating roller (42) is rotatably arranged on the mounting plate (41), and the slit pole piece sequentially passes around the first transmission roller (21), the burr detection assembly (3), the tension roller (23), the floating roller (42) and the second transmission roller (22) and is connected to the winding mechanism; The burr detection assembly (3) comprises a fixed shaft (31), a detection roller (32) and a camera unit (33); the fixed shaft (31) is fixedly arranged on the fixed side plate (1) and is parallel to the roller assembly (2); the detection roller (32) is rotatably arranged on the fixed shaft (31) and is used for allowing the electrode to pass through its outer peripheral surface; the camera unit (33) is symmetrically arranged in two groups, which are respectively fixedly arranged on the fixed shaft (31) on both sides of the detection roller (32) and are used for capturing images of the edges on both sides of the electrode passing on the detection roller (32); The burr detection component (3) corresponds to a middle position between the tension roller (23) and the floating roller (42) in the horizontal direction; Thinning areas (321) that are non-contact with the edge surface of the pole piece are respectively provided on the outer peripheral walls at both ends in the length direction of the detection roller (32).

2. The lithium battery pole piece cutting burr detection device according to claim 1, characterized in that: The first transmission roller (21) and the second transmission roller (22) are both provided with a rotary encoder (5) for obtaining pole piece position information. The rotary encoder (5) is installed at one end of the first transmission roller (21) and the second transmission roller (22) away from the fixed side plate (1) and is used to confirm the running length of the pole piece.

3. The lithium battery pole piece cutting burr detection device according to claim 2, characterized in that: Positioning sensors (6) are provided above the first transmission roller (21) and the second transmission roller (22), and the positioning sensors (6) are used to detect the identification holes on the pole pieces.

4. The lithium battery pole piece cutting burr detection device according to claim 3, characterized in that: The burr detection device also includes a marking component (7) fixedly mounted on the fixed side plate (1), the marking component (7) is located below the side of the second transmission roller (22) away from the tension roller (23), the marking component (7) includes a marking machine (71), a first follower roller (72) and a second follower roller (73), the first follower roller (72) and the second follower roller (73) are arranged at intervals on the fixed side plate (1) and are rotatably connected to the fixed side plate (1), the marking machine (71) is located above the second follower roller (73) and is fixedly connected to the fixed side plate (1), the pole piece transported by the second transmission roller (22) bypasses the first follower roller (72) and the second follower roller (73) in turn and is connected to the winding mechanism, and the marking machine (71) is used to mark the defective pole piece passing through the second follower roller (73).

5. The lithium battery pole piece cutting burr detection device according to claim 4, characterized in that: A first sensing element (711) and a second sensing element (712) are fixedly provided on the marking machine (71), respectively. The first sensing element (711) is used to detect the label paper on the marking machine (71), and the second sensing element (712) is used to detect whether the labeling of defective electrodes is successful or not.

6. A method for detecting burrs during slitting of a lithium battery pole piece, utilizing the device for detecting burrs during slitting of a lithium battery pole piece as claimed in claim 4, characterized in that: The steps are as follows: S1, passing the slit electrode sheet around the first transmission roller (21), the burr detection assembly (3), the tension roller (23), the floating roller (42), the second transmission roller (22), the first follower roller (72) and the second follower roller (73) in sequence and connecting them to the winding mechanism; S2. When the rotary encoder (5) records a certain length of the pole piece tape, the burr detection component (3) is triggered to detect the edge of the pole piece, and the speed of the pole piece tape after slitting is reduced. When the winding speed remains unchanged, the pole piece tape is buffered by the pole piece buffer component (4); S3, marking the electrode area after cutting by the positioning sensor (6), and associating the electrode burr defect area with the corresponding electrode segment; S4. When the burr detection of the corresponding electrode area exceeds the standard, the electrode area passes through the second follower roller (73), and the electrode is labeled as a defective product through the marking machine (71).

Images