A pole piece flexibility detection device and detection method

Abstract

The present application relates to a kind of pole piece flexibility detection equipment and method, it can be fixed in two ends by fixed seat and rotating seat cooperation, by controlling the action of folding motor, can be folded in one end of pole piece fixed on rotating seat, by roller and roller pressing support cooperation, it can guarantee that pole piece is folded in place by roller pressing to crease position.The pole piece folded in place is unfolded again, by detecting light source illumination, camera acquires picture, and the light transmission defect of crease position of pole piece is identified from picture by electric control board, by multiple times after pole piece folding, image acquisition analysis is carried out, and then the flexibility of pole piece is judged.The pole piece flexibility detection equipment of the present application can guarantee the standardization of pole piece folding, to improve detection precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery performance detection, and particularly relates to a pole piece flexibility detection device and a detection method. BACKGROUND

[0002] Lithium ion secondary battery has become a widely used power supply product due to its high single voltage, large energy and power density, long service life, light weight, no memory effect and no pollution. In recent years, with the application in electric vehicles, people have put forward higher performance requirements for lithium ion batteries. The pole piece coating flexibility of lithium ion battery has a great influence on the types of battery production, coating process, baking process and rolling process. Therefore, it is very important to test the flexibility of the pole piece during the research and production of the battery.

[0003] However, the current flexibility detection method of the pole piece is mostly detected by manual bending and winding, which has great subjectivity, non-standard test, many influencing factors, and sometimes great uncertainty of the flexibility detection result of the pole piece, and it is difficult to form a certain quantitative standard and make a judgment on the quality of the pole piece, which affects the further improvement of the quality of the lithium ion battery. SUMMARY

[0004] In view of the problems in the prior art, the purpose of the present application is to provide a pole piece flexibility detection device and a detection method to improve the detection accuracy.

[0005] In order to achieve the above purpose, the present application discloses a pole piece flexibility detection device, which comprises a shell and a folding mechanism, a rolling mechanism, a scanning mechanism and an electric control board arranged in the shell.

[0006] The scanning mechanism comprises a camera and a detection light source arranged at intervals in the Z-axis direction, and the camera and the detection light source are detection stations.

[0007] The rolling mechanism comprises a first Z-axis moving assembly, a rolling frame, a roller and a roller moving assembly, the first Z-axis moving assembly drives the rolling frame and the roller moving assembly to move synchronously along the Z-axis, the roller moving assembly comprises a second Z-axis moving assembly and a Y-axis moving assembly, the second Z-axis moving assembly drives the Y-axis moving assembly to move along the Z-axis, and the Y-axis moving assembly drives the roller to move along the Y-axis, the rolling frame is provided with a rolling support matched with the roller, and the rolling support is located below the roller, and the roller and the rolling support are a rolling station.

[0008] The folding mechanism comprises an X-axis moving assembly, a folding frame, a folding motor, a rotating seat and a fixing seat, the X-axis moving assembly drives the folding frame to move back and forth between a detection station and a rolling station; the folding motor and the fixing seat are connected to the folding frame, the rotating seat is rotatably connected to the folding frame, and the folding motor drives the rotating seat to rotate; the fixing seat is used for fixing one end of the pole piece, and the rotating seat is used for fixing the other end of the pole piece.

[0009] The camera, the detection light source, the first Z-axis moving assembly, the second Z-axis moving assembly, the Y-axis moving assembly, the X-axis moving assembly and the folding motor are all connected to the electric control board.

[0010] After the above settings, the pole piece can be fixed at both ends through the cooperation of the fixing seat and the rotating seat, the pole piece can be folded at one end fixed on the rotating seat through the control of the folding motor, and the rolling position of the fold can be rolled through the cooperation of the roller and the rolling support, so that the pole piece can be folded in place. The folded pole piece is unfolded again, illuminated by the detection light source, and the camera captures the picture, and the electric control board identifies the light transmission defect of the pole piece fold position from the picture. Through multiple image acquisition and analysis after folding the pole piece, the flexibility of the pole piece is judged. Through the above settings, the standardization of the pole piece folding can be ensured, so as to improve the detection accuracy.

[0011] It also comprises a camera displacement assembly for adjusting the position of the camera in the X-axis and Z-axis directions. This setting is conducive to dealing with different detection occasions.

[0012] The camera displacement assembly comprises a limiting sliding groove, a sliding plate, a fixed plate, a fixed support, an auxiliary support and a locking piece, the limiting sliding groove is arranged in the shell, and the length direction of the limiting sliding groove is the X-axis direction; the limiting sliding groove is provided with a limiting block matched with the cross-sectional shape of the limiting sliding groove, the sliding plate is screw-connected with the limiting block; the fixed plate is located below the sliding plate, the fixed plate is connected to the sliding plate through the fixed support and the auxiliary support, and the fixed support extends out of the fixed plate; the locking piece is located below the fixed plate, the locking piece is clamped on the fixed support, and the camera is connected to the locking piece. The camera displacement assembly is simple and reliable in structure.

[0013] The camera displacement assembly further comprises an adjusting cross rod, the length direction of the adjusting cross rod is the Y-axis direction, and the locking piece clamps the adjusting cross rod; the camera is mounted at the end of the adjusting cross rod. This setting can make the position adjustment range of the camera larger.

[0014] The rolling support is provided with a bending piece near one end of the folding mechanism for aligning the fold of the pole piece. By arranging the bending piece, the fold of the pole piece can be ensured to be on a straight line, and the position of the fold is more stable, so as to further improve the standardization of the pole piece folding, and facilitate to ensure the detection accuracy.

[0015] The roll pressing frame is also connected with a material placing support for supporting the pole piece in cooperation with the fixed seat and the rotating seat, the material placing support is located below the roll pressing support, and a supporting column is connected between the roll pressing support and the material placing support. When the pole piece is fed to the folding mechanism, the middle position of the pole piece is supported by the material placing support, so that the pole piece can maintain good flatness before being fixed, and the standardization of the pole piece folding is improved.

[0016] The connecting assembly is arranged between the Y-axis moving assembly and the roller, the connecting assembly comprises a counterweight seat and a guide shaft, the roller is rotationally connected to the lower end of the counterweight seat, the lower end of the guide shaft is connected to the counterweight seat, the upper end of the guide shaft is slidingly connected to the Y-axis moving assembly, and the upper end of the guide shaft is limitingly connected to the Y-axis moving assembly. The arrangement of the connecting assembly can ensure the safety of the roll pressing mechanism.

[0017] The end of the fixed seat away from the rotating seat is rotationally connected with a fixed seat pressing plate, the fixed seat pressing plate cooperates with the fixed seat to clamp and fix one end of the pole piece, and the end of the rotating seat away from the fixed seat is rotationally connected with a rotating seat pressing plate, the rotating seat pressing plate cooperates with the rotating seat to clamp and fix the other end of the pole piece. After such arrangement, the pole piece is fixed simply and conveniently.

[0018] A pole piece flexibility detection method is realized by using the pole piece flexibility detection device, and the pole piece flexibility detection method specifically comprises the following steps:

[0019] Step 1, fixing the pole piece on the rotating seat and the fixed seat of the folding mechanism;

[0020] Step 2, folding the pole piece forward by the folding mechanism;

[0021] Step 3, moving the pole piece to the roll pressing station, controlling the roller of the roll pressing mechanism to roll press the pole piece, and obtaining a 180-degree fold;

[0022] Step 4, moving the pole piece to the detection station, turning on the detection light source, and detecting the light transmission area of the pole piece fold by the camera, and recording the light transmission defects;

[0023] Step 5, moving the pole piece out of the detection station, and folding the pole piece reversely by the folding mechanism;

[0024] Step 6, moving the pole piece to the roll pressing station, controlling the roller of the roll pressing mechanism to roll press the pole piece, and obtaining a 180-degree fold;

[0025] Step 7, moving the pole piece to the detection station, turning on the detection light source, and detecting the light transmission area of the pole piece fold by the camera, and recording the light transmission defects;

[0026] Step 8, judging whether the preset folding cycle number is reached or whether the folding cycle number of the defect is reached, if yes, stopping the detection, otherwise, entering step 2, continuing the detection;

[0027] Step 9, after the detection, judging the flexibility of the pole piece according to the folding cycle number of the defect and the light transmission area.

[0028] In step 2, the forward folding operation is specifically as follows:

[0029] The folding motor drives the rotating seat to fold the pole piece upward by an angle a; the folding mechanism is moved to make the bending piece extend into the folding direction side of the pole piece, and the folding motor drives the rotating seat to fold the pole piece upward by an angle b again; the folding mechanism is moved to make the bending piece exit the pole piece.

[0030] In step 5, the reverse folding operation is specifically as follows:

[0031] The folding motor drives the rotating seat to fold the pole piece downward by an angle a; the folding mechanism is moved to make the bending piece extend into the folding direction side of the pole piece, and the folding motor drives the rotating seat to fold the pole piece downward by an angle b again; the folding mechanism is moved to make the bending piece exit the pole piece, wherein 0°<a≤30°, 100°<b≤150°.

[0032] After the above scheme is adopted, the pole piece can be fixed at both ends by the cooperation of the fixed seat and the rotating seat, the pole piece can be folded at one end fixed on the rotating seat by controlling the folding motor, the folding seam position can be rolled by the cooperation of the roller and the roller support, so that the pole piece can be folded in place. The folded pole piece is unfolded again, the light source is illuminated, the camera collects the picture, the control board identifies the light transmission defect of the pole piece folding seam position from the picture, the image collection and analysis are carried out after the pole piece is folded for many times, and then the flexibility of the pole piece is judged. The pole piece flexibility detection equipment can ensure the standardization of the pole piece folding, so as to improve the detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic view of the present application;

[0034] Figure 2 It is a schematic view of the present application when the hidden door;

[0035] Figure 3 It is a schematic view of the present application when the hidden door;

[0036] Figure 4 It is a schematic view of the present application when the hidden door;

[0037] Figure 5 It is a schematic view of the scanning mechanism (the detection light source is hidden);

[0038] Figure 6 is a schematic view of a folding mechanism;

[0039] Figure 7 is a schematic view of a rolling mechanism;

[0040] Figure 8 is a schematic view of the installation of a roller.

[0041] Explanation of main reference signs:

[0042] Housing 10, bottom plate 11, top plate 12, front plate 13, side plate 14, partition plate 15, door 16, control button 17, inner cover plate 18, mounting stand 19;

[0043] Scanning mechanism 20, fixed support 21, camera 22, detection light source 23, aluminum profile rod 24, limiting sliding groove 25, sliding plate 26, fixed plate 27, auxiliary support 28, locking piece 29, adjusting crossbar 2a;

[0044] Folding mechanism 30, X-axis moving assembly 31, folding frame 32, folding base 321, folding motor base 322, folding stand 323, folding motor 33, rotating seat 34, rotating seat pressing plate 341, fixed seat 35, fixed seat pressing plate 351, driving wheel 361, transmission belt 362, driven wheel 363, folding shaft 364, folding connecting block 365, folding photoelectric sensor 37, code disc 38;

[0045] Rolling mechanism 40, first Z-axis moving assembly 41, rolling base plate 421, discharging support 422, rolling support 423, support column 424, discharging support plate 425, support plate 426, bending piece 427, roller 43, second Z-axis moving assembly 44, Y-axis moving assembly 45, rolling guide seat 46, counterweight seat 47, guide shaft 48, linear bearing 49, limiting piece 4a;

[0046] Pole piece 50. DETAILED DESCRIPTION

[0047] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0048] As Figures 1-8As shown, the present application discloses a kind of pole piece flexibility detection equipment, it includes shell 10 and is arranged in shell 10 and turns over mechanism 30, roll mechanism 40 and scanning mechanism 20, turns over mechanism 30 is used to turn over pole piece 50, using roll mechanism 40 is rolled to the crease of pole piece 50, after turning over and rolling, the crease position of pole piece 50 is scanned to pole piece 50 by scanning mechanism 20, obtains pole piece 50 image, records the light transmission area of pole piece 50 image and turns over number, and the flexibility of pole piece 50 is judged by turns over number and light transmission area.

[0049] Detection space and electric control space are formed in shell 10, and detection space and electric control space are separated by partition 15.In detection space, turn over mechanism 30, roll mechanism 40 and scanning mechanism 20 are installed, and in electric control space, electric control board and heat dissipation assembly are installed, and heat dissipation assembly is connected to electric control board.Shell 10 is composed of bottom plate 11, top plate 12, back plate, front plate 13 and two side plates 14, and partition 15, bottom plate 11, top plate 12, back plate, front plate 13 and two side plates 14 cooperate to form the aforementioned detection space and electric control space.Front plate 13 is provided with door 16, one side of door 16 is hinged to front plate 13, and the other side is magnetically connected to front plate 13.Front plate 13 is also provided with control button 17, which is electrically connected to electric control board.Top plate 12 is provided with illuminating lamp, which is used to illuminate detection space to facilitate the placement operation of pole piece 50 to be detected.Illuminating lamp is connected to electric control board.

[0050] Scanning mechanism 20 includes fixed support 21, camera 22 and detection light source 23, fixed support 21 is fixed inside top plate 12 of shell 10, camera 22 is installed on fixed support 21, and detection light source 23 is installed directly below camera 22.Camera 22 and detection light source 23 form detection station.Detection light source 23 can be fixed directly on bottom plate 11 of shell 10, or fixed on inner sealing plate 18 described below.Camera 22 and detection light source 23 are connected to electric control board.

[0051] In this embodiment, an aluminum profile rod 24 is installed below the top plate 12 of the shell 10, and the aluminum profile rod 24 is provided with a limiting sliding groove 25 extending along the X-axis direction, a plurality of limiting blocks are slidingly connected in the limiting sliding groove 25, the cross-sectional shape of the limiting blocks is matched with the cross-sectional shape of the limiting sliding groove 25, so that the limiting blocks can only move in the length direction of the limiting sliding groove 25. A sliding plate 26, a fixed plate 27, an auxiliary support 28, a locking piece 29 and an adjusting cross rod 2a are provided below the aluminum profile rod 24, the sliding plate 26 is threadedly connected with the limiting blocks through a screw, and the sliding plate 26 is fixed relative to the aluminum profile rod 24 by tightening the screw, and the sliding plate 26 is slidingly connected relative to the aluminum profile rod 24 by slightly loosening the screw. The fixed support 21 and the auxiliary support 28 are connected with the sliding plate 26 and the fixed plate 27 through the shaft expansion sleeve, and the fixed plate 27 is located below the sliding plate 26. The length of the fixed support 21 is greater than the length of the auxiliary support 28, and the fixed support 21 penetrates out of the fixed plate 27. The locking piece 29 is located below the fixed plate 27, and the locking piece 29 is clamped with the fixed support 21. The adjusting cross rod 2a is also clamped with the locking piece 29, and the length direction of the adjusting cross rod 2a is the Z-axis direction. The camera 22 is installed at the end of the adjusting cross rod 2a. This setting can make the camera 22 be able to adjust the position in the three-axis direction to adapt to different application situations. The setting of the auxiliary support 28 can ensure the stability, and is more conducive to ensuring the stability when only the position of the camera 22 needs to be adjusted in the X-axis direction. The aluminum profile rod 24, the sliding plate 26, the fixed plate 27, the fixed support 21, the auxiliary support 28, the locking piece 29 and the adjusting cross rod 2a are the displacement components for the camera 22.

[0052] The folding mechanism 30 includes an X-axis moving assembly 31, a folding frame 32, a folding motor 33, a rotating seat 34 and a fixed seat 35. The X-axis moving assembly 31 is a linear moving module based on an electric mechanism, which is a prior art and will not be described in detail. The X-axis moving assembly 31 is connected with an electric control board. The X-axis moving assembly 31 can be directly fixed on the bottom plate 11 of the shell 10, and the X-axis moving assembly 31 drives the folding frame 32 to move linearly along the X-axis, so as to facilitate the cooperation of the folding mechanism 30 with the rolling mechanism 40 and the scanning assembly. In this embodiment, an inner sealing plate 18 is arranged on the bottom plate 11 of the shell 10, the X-axis moving assembly 31 is located between the inner sealing plate 18 and the bottom plate 11, and the folding frame 32, the folding motor 33, the rotating seat 34 and the fixed seat 35 are located above the inner sealing plate 18.

[0053] The folding motor 33 is fixed on the folding frame 32, and the folding motor 33 is electrically connected with the electric control board. The folding motor 33 is connected with and drives the rotating seat 34 to rotate. The fixed seat 35 is fixed on the folding frame 32, and the fixed seat 35 and the rotating seat 34 form a fixed space for the pole piece 50. The fixed seat 35 and the rotating seat 34 cooperate to fix the pole piece 50. When the pole piece 50 is folded, one end of the pole piece 50 is fixed on the fixed seat 35, and the other end is fixed on the rotating seat 34. After the folding motor 33 is started, the rotating seat 34 is driven to rotate, thereby driving the one end of the pole piece 50 fixed on the rotating seat 34 to fold upward (counterclockwise) or downward (clockwise).

[0054] The folding frame 32 includes a folding base 321, a folding motor 33 seat 322 and a folding upright plate 323. The folding upright plate 323 and the folding motor 33 seat 322 are fixed on the folding base 321, and the folding base 321 is connected with the X-axis moving assembly 31. The fixed seat 35 is installed on the folding upright plate 323. The fixed seat 35 is hinged with a fixed seat pressing plate 351. The fixed seat pressing plate 351 cooperates with the fixed seat 35 to clamp and fix one end of the pole piece 50. Correspondingly, the rotating seat 34 is hinged with a rotating seat pressing plate 341. The rotating seat pressing plate 341 cooperates with the rotating seat 34 to clamp and fix the other end of the pole piece 50. The folding motor 33 is fixed on the folding motor 33, and the folding motor 33 is connected with and drives the rotating seat 34 through a folding transmission assembly. Specifically, the folding transmission assembly includes a driving wheel 361, a transmission belt 362, a driven wheel 363, a folding shaft 364 and a folding connecting block 365. The driving wheel 361 is connected with the output shaft of the folding motor 33. The driven wheel 363 is connected with the driving wheel 361 through the transmission belt 362. The center shaft position of the driven wheel 363 is fixed with the folding shaft 364. The folding shaft 364 is rotatably fixed on the folding motor 33 seat 322, and the folding shaft 364 is connected with the rotating seat 34 through the folding connecting block 365. The folding motor 33 seat 322 is also provided with a folding photoelectric sensor 37 and a code disc 38. The code disc 38 is coaxially connected with the driving wheel 361 and rotates with the driving wheel 361. The folding photoelectric sensor 37 is matched on one side of the code disc 38. The folding photoelectric sensor 37 is connected with the electric control board.

[0055] The rolling mechanism 40 includes a first Z-axis moving assembly 41, a rolling frame, a roller moving assembly and a roller 43. The first Z-axis moving assembly 41 is fixed on the mounting upright plate 19, and the mounting upright plate 19 is fixed between the bottom plate 11 and the top plate 12 of the shell 10. The rolling frame is connected with the first Z-axis moving assembly 41, and the first Z-axis moving assembly 41 drives the rolling frame to move up and down. The rolling frame can be guided and matched with the mounting upright plate 19. The first Z-axis moving assembly 41 is also a linear moving module based on a motor, which is a prior art and will not be described in detail. The first Z-axis moving assembly 41 is connected with the electric control board.

[0056] The roller pressing frame comprises a roller pressing base plate 421, a feeding support 422, a roller pressing support 423 and a supporting column 424, the roller pressing base plate 421 is arranged in parallel with the mounting vertical plate 19, and the roller pressing base plate 421 is connected with the first Z-axis assembly. The feeding support 422 is connected at the lower end of the roller pressing base plate 421, and a feeding supporting plate 425 is arranged on the feeding support 422. The roller pressing support 423 is connected at one side of the roller pressing base plate 421 and is located above the feeding support 422, the upper end of the supporting column 424 is connected with the roller pressing support 423, and the lower end is connected with the feeding support 422. The upper end of the roller pressing support 423 is provided with a supporting plate 426, and the roller 43 and the supporting plate 426 form a roller pressing station therebetween. The end of the roller pressing support 423 away from the roller pressing base plate 421 is connected with a bending piece 427 for aligning the creases.

[0057] The roller moving assembly is installed on the roller pressing base plate 421, and comprises a second Z-axis moving assembly 44 and a Y-axis moving assembly 45, the second Z-axis moving assembly 44 is fixed on the roller pressing base plate 421 and connected with the Y-axis moving assembly 45 through a Z-axis moving seat, and the Y-axis moving assembly 45 is connected with the roller pressing guide seat 46 through an X-axis moving seat. The second Z-axis moving assembly 44 realizes the up-down movement of the roller 43, and the Y-axis moving assembly 45 realizes the front-back movement of the roller 43. The second Z-axis moving assembly 44 and the Y-axis moving assembly 45 are both linear moving modules based on motors, which are prior art and will not be described in detail, and the second Z-axis moving assembly 44 and the Y-axis moving assembly 45 are both connected with an electric control board.

[0058] The roller moving assembly is connected with the roller 43 through the roller pressing guide seat 46, and the roller 43 is located below the end of the roller pressing guide seat 46 away from the roller moving assembly. The roller 43 is connected with the roller pressing guide seat 46 through a connecting assembly, specifically, the connecting assembly comprises a counterweight seat 47 and a guide shaft 48, the roller 43 is rotatably connected below the counterweight seat 47, the lower end of the guide shaft 48 is connected with the upper end of the counterweight seat 47, the upper end of the guide shaft 48 penetrates through the roller pressing guide seat 46, the roller pressing guide seat 46 is provided with a linear bearing 49 in sliding fit with the guide shaft 48, and in addition, the upper end of the guide shaft 48 is provided with a limiting piece 4a in limiting fit with the linear bearing 49.

[0059] The working principle of the present application is as follows:

[0060] 1、X-axis moving assembly 31 moves to make fixed seat 35 and rotating seat 34 keep in line, and then first Z-axis moving assembly 41 moves to make discharging support plate 425 lift to keep in line with fixed seat 35 (fixed seat 35, rotating seat 34 and discharging support plate 425 are arranged staggeredly, so no collision occurs), at this time, rotating seat pressing plate 341 and fixed seat pressing plate 351 are opened manually, and the pole piece 50 to be detected is placed on fixed seat 35, discharging support plate 425 and rotating seat 34, and the arrangement of discharging support plate 425 can ensure that the pole piece 50 is placed stably. Rotating seat pressing plate 341 and fixed seat pressing plate 351 are rotated and lowered manually, so that the pole piece 50 is clamped and fixed.

[0061] 2、First Z-axis moving assembly 41 moves to make discharging support plate 425 and support plate 426 move downward, and X-axis moving assembly 31 moves to make fixed seat 35 and rotating seat 34 move to the left and return to the detection station.

[0062] 3、Folding motor 33 moves to make one end of the pole piece 50 fixed by rotating seat 34 turn a angle (for example, a = 30°) in a first direction, and then make bending piece 427 be arranged on the side of the turning direction of the pole piece 50 (by moving the pole piece 50 through X-axis moving assembly 31). Then, folding motor 33 moves to make one end of the pole piece 50 fixed by rotating seat 34 continue to turn b angle (for example, b = 120°) in the first direction, at this time, the pole piece 50 is preliminarily formed and can keep in line due to the blocking effect of bending piece 427 on the pole piece 50 (at this time, the pole piece 50 is bent by 150°). Bending piece 427 is withdrawn (by moving the pole piece 50 through X-axis moving assembly 31), and first Z-axis moving assembly 41 is controlled to move to make support plate 426 move downward, and then the pole piece 50 moves to the right, so that the pole piece 50 is arranged between support plate 426 and roller 43 (i.e. roller pressing station), and roller 43 is controlled to move downward to press the crease position of the pole piece 50, and the pressing direction is perpendicular to the length direction of the crease, so that the crease of 180° is obtained. Roller 43 moves upward, the pole piece 50 moves to the left between camera 22 and detection light source 23, and folding motor 33 moves to make the pole piece 50 open (i.e. make the motor turn (a+b) angle in a second direction, and the second direction is opposite to the first direction). Detection light source 23 is turned on, and camera 22 takes a picture to record the defect morphology and quantity at the crease. The first direction can be clockwise direction, and the second direction is counterclockwise direction; alternatively, the first direction is counterclockwise direction, and the second direction is clockwise direction.

[0063] 4. The folding motor 33 actuates, causing one end of the electrode 50 fixed by the rotating seat 34 to flip by an angle 'a' along the second direction, and then the bending piece 427 is placed on the folding direction side of the electrode 50. Afterwards, the folding motor 33 actuates again, causing one end of the electrode 50 fixed by the rotating seat 34 to continue flipping by an angle 'b' along the second direction. At this point, due to the blocking effect of the bending piece 427 on the electrode 50, the fold of the electrode 50 is initially formed and can maintain alignment. The bending piece 427 is then disengaged, and the first Z-axis moving assembly 41 is controlled to actuate, causing the support plate 426 to move downwards. Then, the electrode 50 moves to the right, placing it between the support plate 426 and the roller 43. The roller 43 is controlled to move downwards, rolling the fold of the electrode 50. The rolling direction is perpendicular to the length direction of the fold, thus obtaining a 180° fold. Roller 43 moves upward, and electrode 50 moves to the left between camera 22 and detection light source 23. At the same time, folding motor 33 is activated, causing electrode 50 to open (that is, the motor flips by an angle of (a+b) along the first direction). Detection light source 23 is turned on, and camera 22 takes pictures to record the morphology and number of defects at the fold.

[0064] 5. Keep the fixed seat 35 and the rotating seat 34 aligned. The X-axis moving component 31 moves the fixed seat 35 and the rotating seat 34 to the right above the feeding tray 425. Then, the first Z-axis moving component 41 raises the feeding tray 425 to be aligned with the fixed seat 35 (the fixed seat 35, the rotating seat 34, and the feeding tray 425 are staggered to prevent collision). At this point, the rotating seat pressure plate 341 and the fixed seat pressure plate 35 can be manually opened to unload the electrode 50 and reload the electrode 50 to be tested.

[0065] This invention also discloses a method for testing electrode flexibility, which can be implemented using the aforementioned electrode flexibility testing device. The method specifically includes the following steps:

[0066] Step 1: Fix the electrode 50 onto the rotating seat 34 and the fixed seat 35 of the folding mechanism 30.

[0067] Step 2: Fold the electrode 50 in the forward direction using the folding mechanism 30.

[0068] The forward folding operation is as follows:

[0069] The folding motor 33 drives the rotating seat 34 to fold the electrode 50 upward by an angle a; the folding mechanism 30 is moved so that the bending piece 427 extends into the folding direction side of the electrode 50, and the folding motor 33 drives the rotating seat 34 to fold the electrode 50 upward by an angle b again; the folding mechanism 30 is moved so that the bending piece 427 exits the electrode 50, where 0° < a ≤ 30°, 100° < b ≤ 150°.

[0070] Step 3, moving the pole piece 50 to the rolling station, controlling the roller 43 of the rolling mechanism to roll the pole piece 50, and obtaining a 180-degree folded crease.

[0071] Step 4, moving the pole piece 50 to the detection station, turning on the detection light source 23, and detecting the light transmission area of the crease of the pole piece 50 through the camera 22, and recording the light transmission defects.

[0072] Step 5, moving the pole piece 50 out of the detection station, and reversing the pole piece 50 through the folding mechanism 30.

[0073] The folding motor 33 drives the rotating seat 34 to fold the pole piece 50 downward by an angle a; moving the folding mechanism 30 to make the bending piece 427 extend into the folding direction side of the pole piece 50, and again folding the pole piece 50 downward by an angle b through the folding motor 33 driving the rotating seat 34, and moving the folding mechanism 30 to make the bending piece 427 exit the pole piece 50, wherein 0°<a≤30°, 100°<b≤150°.

[0074] Step 6, moving the pole piece 50 to the rolling station, controlling the roller 43 of the rolling mechanism to roll the pole piece 50, and obtaining a 180-degree folded crease.

[0075] Step 7, moving the pole piece 50 to the detection station, turning on the detection light source 23, and detecting the light transmission area of the crease of the pole piece 50 through the camera 22, and recording the light transmission defects.

[0076] Step 8, judging whether the preset folding cycle number is reached, or judging whether the folding cycle number of the defects is reached, if reached, stopping the detection, otherwise, entering step 2, and continuing the detection.

[0077] Step 9, after the detection is finished, judging the flexibility of the pole piece 50 according to the folding cycle number of the defects and the light transmission area.

[0078] The above is only an embodiment of the present application, and does not limit the technical range of the present application, so any slight modification, equivalent change and modification of the above embodiment according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A pole piece flexibility detection apparatus, characterized by: The shell, the folding mechanism, the rolling mechanism, the scanning mechanism and the electric control board arranged in the shell; The scanning mechanism comprises a camera and a detection light source arranged in the Z-axis direction, and a detection station is arranged between the camera and the detection light source; The rolling mechanism comprises a first Z-axis moving assembly, a rolling frame, a roller and a roller moving assembly, the first Z-axis moving assembly drives the rolling frame and the roller moving assembly to move along the Z-axis synchronously, the roller moving assembly comprises a second Z-axis moving assembly and a Y-axis moving assembly, the second Z-axis moving assembly drives the Y-axis moving assembly to move along the Z-axis, and the Y-axis moving assembly drives the roller to move along the Y-axis, the rolling frame comprises a rolling bottom plate, a feeding support and a rolling support, the rolling bottom plate is connected with the first Z-axis assembly, the feeding support is connected at the lower end of the rolling bottom plate, and a feeding supporting plate is arranged on the feeding support, the rolling support is connected at one side of the rolling bottom plate and located above the feeding support, a supporting plate is arranged at the upper end of the rolling support, and a rolling station is arranged between the roller and the supporting plate, and a bending piece for aligning the fold is connected at the end of the rolling support away from the rolling bottom plate; The folding mechanism comprises an X-axis moving assembly, a folding frame, a folding motor, a rotating seat and a fixing seat, the X-axis moving assembly drives the folding frame to reciprocate between the detection station and the rolling station, the folding motor and the fixing seat are connected on the folding frame, the rotating seat is rotatably connected with the folding frame, and the folding motor drives the rotating seat to rotate, the fixing seat is used for fixing one end of the pole piece, and the rotating seat is used for fixing the other end of the pole piece; The camera, the detection light source, the first Z-axis moving assembly, the second Z-axis moving assembly, the Y-axis moving assembly, the X-axis moving assembly and the folding motor are connected with the electric control board.

2. The pole piece flexibility detection apparatus of claim 1, wherein: A camera displacement assembly for adjusting the position of the camera in the X-axis and Z-axis directions is further included.

3. The pole piece flexibility detection apparatus of claim 2, wherein: The camera displacement assembly comprises a limiting sliding groove, a sliding plate, a fixing plate, a fixing support, an auxiliary support and a locking piece, the limiting sliding groove is arranged in the shell, and the length direction of the limiting sliding groove is the X-axis direction, a limiting block matched with the cross-sectional shape of the limiting sliding groove is arranged in the limiting sliding groove, and the sliding plate is screwed with the limiting block, the fixing plate is located below the sliding plate, the fixing plate is connected with the sliding plate through the fixing support and the auxiliary support, and the fixing support extends from the fixing plate, the locking piece is located below the fixing plate, the locking piece is clamped on the fixing support, and the camera is connected with the locking piece.

4. The pole piece flexibility detection apparatus of claim 3, wherein: The camera displacement assembly further comprises an adjusting cross rod, the length direction of the adjusting cross rod is the Y-axis direction, and the locking piece clamps the adjusting cross rod, and the camera is mounted at the end of the adjusting cross rod.

5. The pole piece flexibility detection apparatus of claim 1, wherein: A connecting assembly arranged between the Y-axis moving assembly and the roller is further included, the connecting assembly comprises a counterweight seat and a guide shaft, the roller is rotatably connected at the lower end of the counterweight seat, the lower end of the guide shaft is connected with the counterweight seat, the upper end of the guide shaft is slidably connected with the Y-axis moving assembly, and the upper end of the guide shaft is limitingly connected with the Y-axis moving assembly.

6. The pole piece flexibility detection apparatus of claim 1, wherein: The end of the fixed seat away from the rotating seat is rotationally connected with a fixed seat pressing plate, and the fixed seat pressing plate clamps one end of the fixed pole piece in cooperation with the fixed seat; the end of the rotating seat away from the fixed seat is rotationally connected with a rotating seat pressing plate, and the rotating seat pressing plate clamps the other end of the fixed pole piece in cooperation with the rotating seat.

7. A method of detecting the flexibility of an electrode sheet, characterized by: The pole piece flexibility detection method is implemented by using the pole piece flexibility detection equipment as claimed in any one of claims 1-6, and specifically includes the following steps: Step 1, fixing the pole piece on the rotating seat and the fixed seat of the folding mechanism; Step 2, folding the pole piece in the forward direction by the folding mechanism; Step 3, moving the pole piece to the roller pressing station, controlling the roller of the roller pressing mechanism to press the pole piece to obtain a 180-degree fold; Step 4, moving the pole piece to the detection station, turning on the detection light source, and detecting the light transmission area at the fold of the pole piece by the camera and recording the light transmission defects; Step 5, moving the pole piece out of the detection station, and folding the pole piece in the reverse direction by the folding mechanism; Step 6, moving the pole piece to the roller pressing station, controlling the roller of the roller pressing mechanism to press the pole piece to obtain a 180-degree fold; Step 7, moving the pole piece to the detection station, turning on the detection light source, and detecting the light transmission area at the fold of the pole piece by the camera and recording the light transmission defects; Step 8, judging whether the preset folding cycle number is reached, or judging whether the folding cycle number of the defects is reached, if yes, stopping the detection, otherwise, entering step 2 to continue the detection; Step 9, after the detection is completed, determining the flexibility of the pole piece according to the folding cycle number of the defects and the light transmission area.

8. The method of claim 7, wherein: In step 2, the forward folding operation is specifically as follows: The rotating seat is driven by the folding motor to fold the pole piece upward by an angle a; the folding mechanism is moved to make the bending piece extend into the folding direction side of the pole piece, and the rotating seat is driven again by the folding motor to continue to fold the pole piece upward by an angle b; the folding mechanism is moved to make the bending piece exit the pole piece; In step 5, the reverse folding operation is specifically as follows: The rotating seat is driven by the folding motor to fold the pole piece downward by an angle a; the folding mechanism is moved to make the bending piece extend into the folding direction side of the pole piece, and the rotating seat is driven again by the folding motor to continue to fold the pole piece downward by an angle b; the folding mechanism is moved to make the bending piece exit the pole piece, wherein 0°<a≤30°, 100°<b≤150°.

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