Lithium battery pole piece coating thickness detection device

Abstract

The invention discloses a lithium battery pole piece coating thickness detection device. The device comprises a frame; the two moving assemblies are symmetrically arranged on the frame, the two moving assemblies are arranged on the two sides of a pole piece respectively, first laser sensors are symmetrically arranged on the two moving assemblies, and the pair of first laser sensors are arranged vertically towards the pole piece and used for detecting the coating thickness of the pole piece; the driving part is arranged on one side of the frame and used for driving the moving assembly. The two first laser sensors arranged on the upper side and the lower side of the pole piece are used for detecting the thickness of the pole piece after coating, the thickness is indirectly detected, the pole piece is not affected, detection can be conducted without shutdown, continuous detection can be conducted, the detection precision is high, and the measurement speed is high; the driving part is used for driving the moving assembly to further drive the first laser sensor to move horizontally, the thicknesses of different positions of the pole piece can be detected, detection is more comprehensive, and the quality of the pole piece can be better monitored.

Description

Technical Field

[0001] The present invention belongs to the technical field of pole piece coating detection, and in particular relates to a lithium battery pole piece coating thickness detection device. Background Art

[0002] Under the international environment of energy conservation and emission reduction, countries around the world are striving to develop and apply green energy. Lithium-ion batteries, as a high-performance rechargeable green battery with high energy density, long cycle life, good rate performance, environmental friendliness and no pollution, have been increasingly used in various electronic products due to their advantages such as high single cell voltage, large capacity, small size, light weight and wide operating temperature range. The research and development of lithium-ion batteries has received great attention.

[0003] In the production process of lithium-ion batteries, pole piece coating is a relatively important link, and the pole piece coating production line is also one of the key equipment. In the pole piece coating production process, pole piece sampling and testing is another important link. The existing testing method is to use die sampling during the coating production interval, that is, when it pauses (drying process requirements), and then perform relevant process tests on the samples. Although this method is low-cost, sampling must be carried out during the coating production interval, which cannot reflect the quality status of the coating production in a timely manner, cannot monitor the coating quality in real time, and has large production losses and low detection efficiency.

[0004] The Chinese utility model patent with publication number CN218443762U discloses a negative electrode material coating thickness detection device, including a detection frame, a limit groove is opened in the middle of the bottom wall of the detection frame, a pole piece is placed in the limit groove, and a through opening is opened in the middle of the top of the detection frame; a slide rail is fixedly installed on the rear side of the through opening, and a slider is placed in the slide rail.

[0005] Although this negative electrode material coating thickness detection device can improve detection efficiency, it still requires stopping the machine for sampling and detection. Summary of the invention

[0006] The object of the present invention is to provide a device for detecting coating thickness of a lithium battery pole piece to solve at least one of the above-mentioned technical problems.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A lithium battery pole piece coating thickness detection device, comprising:

[0009] A frame, which is erected along the circumference of the pole piece so that the pole piece passes through;

[0010] Two groups of moving components are symmetrically arranged on the frame, the moving direction of each moving component is parallel to the width direction of the pole piece, the two groups of moving components are arranged on both sides of the pole piece, and the two groups of moving components are symmetrically provided with first laser sensors, and a pair of the first laser sensors are arranged vertically toward the pole piece, for detecting the coating thickness of the pole piece;

[0011] A driving part is arranged on one side of the frame and is used to drive the moving assembly.

[0012] The present invention uses a frame to install a moving component, a driving unit and a first laser sensor. Two first laser sensors arranged on the upper and lower sides of the pole piece are used to detect the thickness of the pole piece after coating, and the thickness is indirectly detected without affecting the pole piece. The detection can be performed without stopping the machine, and continuous detection is possible. The detection accuracy is high and the measurement speed is fast. The driving unit is used to drive the moving component, which in turn drives the first laser sensor to move horizontally, so that the thickness at different positions of the pole piece can be detected, the detection is more comprehensive, and the quality of the pole piece can be better monitored.

[0013] Specifically, the moving assembly includes a guide rod, a first screw rod, a connecting block and a first transmission wheel;

[0014] Wherein, the guide rod is fixedly arranged in the frame and is extended along the width direction of the pole piece;

[0015] The first screw rod is rotatably disposed in the frame, and one end of the first screw rod passes through the frame, and the first screw rod is parallel to the guide rod;

[0016] The first transmission wheel is coaxially arranged at the exit end of the first screw rod, and a pair of the first transmission wheels are located on the same side of the frame;

[0017] The connecting block is threadedly connected to the first screw rod, and the connecting block is slidably connected to the guide rod;

[0018] The first laser sensor is arranged on the corresponding connecting block.

[0019] The present invention cooperates with each other through the first screw rod, the guide rod and the connecting block. The guide rod and the first screw rod jointly limit the moving direction of the connecting block. The length direction of the first screw rod is consistent with that of the guide rod. The connecting block can only move along the length direction of the guide rod. The rotation of the first screw rod can drive the connecting block to move. The first laser sensor is arranged on the connecting block, which can drive the two first laser sensors to move synchronously.

[0020] Specifically, the driving unit includes a first driving motor and a second transmission wheel. The first driving motor is installed on one side of the frame in a horizontal direction. The second transmission wheel is coaxially arranged on the output shaft of the first driving motor. The second transmission wheel is connected to the two first transmission wheels. The first driving motor is used to drive the first transmission wheel, thereby driving the two first screw rods to rotate. One first driving motor drives the two first screw rods to rotate at the same time, so that the two first laser sensors can be better kept consistent during movement.

[0021] Furthermore, the distances from the output shaft of the first drive motor to the two first screw rods are consistent, so that the force transmitted from the first drive motor to the two first screw rods can be better kept consistent.

[0022] Furthermore, the second transmission wheel is connected to the two first transmission wheels via a belt, which is beneficial for evenly distributing the force of the first drive motor to the two first screw rods.

[0023] Preferably, a third transmission wheel is provided between the second transmission wheel and the first transmission wheel, and the third transmission wheel is respectively meshed with the first transmission wheel and the second transmission wheel, which is beneficial to evenly distribute the force of the first drive motor to the two first screw rods. The first transmission wheel, the second transmission wheel and the third transmission wheel are all gears, which are more durable.

[0024] Furthermore, a horizontally oriented second laser sensor is provided on the connecting block, and the two second laser sensors are symmetrically arranged along the pole piece; after the first laser sensor has been running for a long time, the relative positions of the two first laser sensors may deviate due to factors such as wear of various components, which may lead to an increase in the measurement error of the pole piece thickness; the second laser sensor is arranged to detect the distance from the first laser sensor to the side of the frame, and then monitor the consistency of the movement of the two first laser sensors in real time. When the deviation of the relative position of the two first laser sensors exceeds the allowable error range, it can remind the staff to carry out maintenance.

[0025] Further, a correction component is provided at one end of the connecting block close to the pole piece, and the correction component includes a mounting box, a second screw rod, a second drive motor, a slider and a mounting block. The second screw rod is rotatably provided in the mounting box along the length direction of the first screw rod, and the second drive motor is provided on one side of the mounting box. The output shaft of the second drive motor is coaxially fixed with the second screw rod. The slider is slidably connected in the mounting box, and the slider is threadedly connected to the second screw rod. The mounting block is provided outside the mounting box, and the mounting block is fixedly connected to the slider. The first laser sensor and the second laser sensor are both mounted on the mounting block; the correction component can automatically correct the relative position of the two first laser sensors in real time after the relative position of the two first laser sensors deviates, so as to maintain the detection accuracy of the first laser sensor; the second drive motor can drive the second screw rod to rotate, thereby driving the slider to slide in the mounting box, and the slider can drive the mounting block to move. The first laser sensor and the second laser sensor are both mounted on the mounting block, so as to achieve fine-tuning of the positions of the first laser sensor and the second laser sensor, so that the positions of the two first laser sensors correspond to each other, and the consistency of movement is maintained, so as to more accurately detect the thickness of the pole piece.

[0026] Furthermore, the two correction components are symmetrically arranged along the pole piece, which is conducive to better adjusting the positions of the first laser sensor and the second laser sensor, and is also convenient for maintaining the consistency of the movement of the first laser sensor and the second laser sensor, which is conducive to ensuring the consistency of the force applied to the first laser sensor and the second laser sensor.

[0027] Furthermore, the length directions of the guide rod, the first screw rod and the second screw rod are all perpendicular to the movement direction of the pole piece.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The present invention uses a frame to install a moving assembly, a driving unit and a first laser sensor. Two first laser sensors are arranged on the upper and lower sides of the pole piece to detect the thickness of the pole piece after coating. The thickness is detected indirectly without affecting the pole piece. The detection can be carried out without stopping the machine. The detection can be continuous, with high detection accuracy and fast measurement speed. The driving unit is used to drive the moving assembly, thereby driving the first laser sensor to move horizontally, so that the thickness at different positions of the pole piece can be detected. The detection is more comprehensive and the quality of the pole piece can be better monitored.

[0030] (2) The second laser sensor provided in the present invention is used to detect the distance from the first laser sensor to the side of the frame, thereby monitoring the consistency of the movement of the two first laser sensors in real time. When the deviation of the relative positions of the two first laser sensors exceeds the allowable error range, the staff can be reminded to perform maintenance.

[0031] (3) The second drive motor provided in the present invention can drive the second screw to rotate, thereby driving the slider to slide in the mounting box. The slider can drive the mounting block to move. The first laser sensor and the second laser sensor are both mounted on the mounting block, thereby enabling fine adjustment of the positions of the first laser sensor and the second laser sensor, so that the positions of the two first laser sensors correspond to each other and the consistency of movement is maintained, thereby enabling more accurate detection of the thickness of the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of a lithium battery pole piece coating thickness detection device in this embodiment;

[0033] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0034] Figure 3 is a position relationship diagram between the third transmission wheel, the first transmission wheel and the second transmission wheel in this embodiment;

[0035] In the figure: 1. frame; 2. moving component; 201. guide rod; 202. first screw rod; 203. connecting block; 204. first transmission wheel; 3. pole piece; 4. first laser sensor; 5. driving unit; 501. first driving motor; 502. second transmission wheel; 503. belt; 504. third transmission wheel; 6. second laser sensor; 7. correction component; 701. mounting box; 702. second screw rod; 703. second driving motor; 704. slider; 705. mounting block. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides a lithium battery pole piece coating thickness detection device, including a frame 1, two groups of moving components 2 and a driving part 5.

[0038] The frame 1 is erected along the circumference of the pole piece 3 so that the pole piece 3 passes through.

[0039] Two groups of mobile components 2 are symmetrically arranged on the frame 1, and the moving direction of each mobile component 2 is parallel to the width direction of the pole piece 3. The two groups of mobile components 2 are arranged on both sides of the pole piece 3. The two groups of mobile components 2 are symmetrically provided with first laser sensors 4. A pair of the first laser sensors 4 are arranged vertically toward the pole piece 3 for detecting the coating thickness of the pole piece 3.

[0040] Specifically, the moving assembly 2 includes a guide rod 201, a first screw rod 202, a connecting block 203 and a first transmission wheel 204;

[0041] The guide rod 201 is fixedly disposed in the frame 1 and is extended along the width direction of the pole piece 3;

[0042] The first screw rod 202 is rotatably disposed in the frame 1, and one end thereof passes through the frame 1, and the first screw rod 202 is parallel to the guide rod 201;

[0043] The first transmission wheel 204 is coaxially arranged at the exit end of the first screw rod 202, and a pair of the first transmission wheels 204 are located on the same side of the frame 1;

[0044] The connecting block 203 is threadedly connected to the first screw rod 202, and the connecting block 203 is slidably connected to the guide rod 201;

[0045] The first laser sensor 4 is disposed on the corresponding connecting block 203 .

[0046] The present invention cooperates with each other through the first screw rod 202, the guide rod 201 and the connecting block 203. The guide rod 201 and the first screw rod 202 jointly define the moving direction of the connecting block 203. The length direction of the first screw rod 202 is consistent with that of the guide rod 201. The connecting block 203 can only move along the length direction of the guide rod 201. The rotation of the first screw rod 202 can drive the connecting block 203 to move. The first laser sensor 4 is set on the connecting block 203, which can drive the two first laser sensors 4 to move synchronously.

[0047] The driving unit 5 is arranged on one side of the frame 1, and is used to drive the moving assembly 2. Specifically, the driving unit 5 includes a first driving motor 501 and a second transmission wheel 502. The first driving motor 501 is installed on one side of the frame 1 in the horizontal direction, and the second transmission wheel 502 is coaxially arranged on the output shaft of the first driving motor 501. The second transmission wheel 502 is connected to the two first transmission wheels 204 in a transmission manner. The first driving motor 501 is used to drive the first transmission wheel 204, thereby driving the two first screw rods 202 to rotate. One first driving motor 501 drives the two first screw rods 202 to rotate at the same time, so that the two first laser sensors 4 can be better kept consistent when moving. Further, the distance from the output shaft of the first driving motor 501 to the two first screw rods 202 is consistent, so that the force transmitted from the first driving motor 501 to the two first screw rods 202 is better kept consistent. Further, the second transmission wheel 502 is connected to the two first transmission wheels 204 in a transmission manner through a belt 503, which is conducive to evenly distributing the force of the first driving motor 501 to the two first screw rods 202. Preferably, if Figure 3 As shown, a third transmission wheel 504 can also be set between the second transmission wheel 502 and the first transmission wheel 204. The third transmission wheel 504 is respectively engaged with the first transmission wheel 204 and the second transmission wheel 502, which is beneficial to evenly distribute the force of the first drive motor 501 to the two first screw rods 202. The first transmission wheel 204, the second transmission wheel 502 and the third transmission wheel 504 are all gears, which are more durable.

[0048] In the present invention, a frame 1 is provided for installing a moving component 2, a driving unit 5 and a first laser sensor 4. Two first laser sensors 4 are provided on the upper and lower sides of the pole piece 3 to detect the thickness of the pole piece 3 after coating, and the thickness is indirectly detected without affecting the pole piece 3. The detection can be performed without stopping the machine, and the detection can be performed continuously with high detection accuracy and fast measurement speed. The driving unit 5 is provided to drive the moving component 2, thereby driving the first laser sensor 4 to move horizontally, so that the thickness at different positions of the pole piece 3 can be detected, the detection is more comprehensive, and the quality of the pole piece 3 can be better monitored.

[0049] Furthermore, a horizontally oriented second laser sensor 6 is provided on the connecting block 203, and the two second laser sensors 6 are symmetrically arranged along the pole piece 3; after the first laser sensor 4 has been running for a long time, the relative positions of the two first laser sensors 4 may deviate due to factors such as wear of various components, which may further increase the error in measuring the thickness of the pole piece 3; the second laser sensor 6 is arranged to detect the distance from the first laser sensor 4 to the side of the frame, and then monitor the consistency of the movement of the two first laser sensors 4 in real time. When the deviation of the relative positions of the two first laser sensors 4 exceeds the allowable error range, the staff can be reminded to repair.

[0050] Furthermore, a correction component 7 is provided at one end of the connecting block 203 close to the pole piece 3, and the correction component 7 includes an installation box 701, a second screw rod 702, a second drive motor 703, a slider 704 and a installation block 705. The second screw rod 702 is rotatably provided in the installation box 701 along the length direction of the first screw rod 202, and both ends of the second screw rod 702 are also rotatably connected to the side wall of the installation box 701 through bearings. The second drive motor 703 is provided on one side of the installation box 701, and the second drive motor 703 is located outside the installation box 701. The output shaft of the second drive motor 703 is coaxially fixed with the second screw rod 702. The slider 704 is slidably connected in the installation box 701, and the slider 704 can slide along the length direction of the second screw rod 702 in the installation box 701. The slider 704 is threadedly connected to the second screw rod 702. The installation box 701 is provided with the installation Block 705, a slot is provided on one side of the mounting box 701 close to the mounting block 705, and the mounting block 705 is fixedly connected to the slider 704 through the slot, and the first laser sensor 4 and the second laser sensor 6 are both mounted on the mounting block 705; the correction component 7 provided can automatically correct the deviation in real time after the relative positions of the two first laser sensors 4 deviate, so as to maintain the detection accuracy of the first laser sensor 4; the second drive motor 703 provided can drive the second screw rod 702 to rotate, thereby driving the slider 704 to slide in the mounting box 701, and the slider 704 can drive the mounting block 705 to move, and the first laser sensor 4 and the second laser sensor 6 are both mounted on the mounting block 705, so as to achieve fine-tuning of the positions of the first laser sensor 4 and the second laser sensor 6, so that the positions of the two first laser sensors 4 correspond to each other, and the consistency of movement is maintained, so that the thickness of the pole piece 3 can be detected more accurately. Furthermore, the two correction components 7 are symmetrically arranged along the pole piece 3, which is conducive to better adjusting the positions of the first laser sensor 4 and the second laser sensor 6, and is also convenient for maintaining the consistency of the movement of the first laser sensor 4 and the second laser sensor 6, which is conducive to ensuring the consistency of the force applied to the first laser sensor 4 and the second laser sensor 6.

[0051] Furthermore, the length directions of the guide rod 201 , the first screw rod 202 , and the second screw rod 702 are all perpendicular to the movement direction of the pole piece 3 .

[0052] Working principle: two first laser sensors 4 are set to measure the distance from both sides of the same position of the pole piece 3 at the same time. Since the distance between the two first laser sensors 4 is fixed, the thickness of the pole piece 3 can be obtained through the data measured by the two first laser sensors 4; the first driving motor 501 is set to drive the second transmission wheel 502 to rotate, and the second transmission wheel 502 can drive the first transmission wheel 204 to rotate, and then drive the first screw rod 202 to rotate. The rotating first screw rod 202 will drive the connecting block 203 to move along the length direction of the guide rod 201, drive the first laser sensor 4 and the second laser sensor 6 to move, and the first laser sensor 4 moves back and forth, and cooperates with the continuously moving pole piece 3. The first laser sensor 4 can form an "S"-shaped detection track on the pole piece 3; the second driving motor 703 can drive the second screw rod 702 to rotate, and then drive the slider 704 to move, and can fine-tune the position of the first laser sensor 4 and the second laser sensor 6.

[0053] It should be noted that although the present invention is disclosed as above by specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A lithium battery pole piece coating thickness detection device, characterized in that: include: A frame, which is erected along the circumference of the pole piece so that the pole piece passes through; Two groups of moving components are symmetrically arranged on the frame, the moving direction of each moving component is parallel to the width direction of the pole piece, the two groups of moving components are arranged on both sides of the pole piece, and the two groups of moving components are symmetrically provided with first laser sensors, and a pair of the first laser sensors are arranged vertically toward the pole piece, for detecting the coating thickness of the pole piece; A driving part is arranged on one side of the frame and is used to drive the moving assembly.

2. The lithium battery pole piece coating thickness detection device according to claim 1, characterized in that: The moving assembly includes a guide rod, a first screw rod, a connecting block and a first transmission wheel; Wherein, the guide rod is fixedly arranged in the frame and is extended along the width direction of the pole piece; The first screw rod is rotatably disposed in the frame, and one end of the first screw rod passes through the frame, and the first screw rod is parallel to the guide rod; The first transmission wheel is coaxially arranged at the exit end of the first screw rod, and a pair of the first transmission wheels are located on the same side of the frame; The connecting block is threadedly connected to the first screw rod, and the connecting block is slidably connected to the guide rod; The first laser sensor is arranged on the corresponding connecting block.

3. The lithium battery pole piece coating thickness detection device according to claim 2, characterized in that: The driving part includes a first driving motor and a second transmission wheel. The first driving motor is installed on one side of the frame along the horizontal direction. The second transmission wheel is coaxially arranged on the output shaft of the first driving motor. The second transmission wheel is connected to the two first transmission wheels in transmission.

4. The lithium battery pole piece coating thickness detection device according to claim 3, characterized in that: The distances from the output shaft of the first drive motor to the two first screw rods are consistent.

5. The lithium battery pole piece coating thickness detection device according to claim 3, characterized in that: The second transmission wheel is connected to the two first transmission wheels through a belt.

6. The lithium battery pole piece coating thickness detection device according to claim 3, characterized in that: A third transmission wheel is provided between the second transmission wheel and the first transmission wheel, and the third transmission wheel is meshed with the first transmission wheel and the second transmission wheel respectively.

7. The lithium battery pole piece coating thickness detection device according to claim 2, characterized in that: The connecting block is provided with a horizontally oriented second laser sensor, and two of the second laser sensors are symmetrically arranged along the pole piece.

8. The lithium battery pole piece coating thickness detection device according to claim 7, characterized in that: A correction assembly is provided at one end of the connecting block close to the pole piece, and the correction assembly includes a mounting box, a second screw rod, a second drive motor, a slider and a mounting block. The second screw rod is rotatably provided in the mounting box along the length direction of the first screw rod, and the second drive motor is provided on one side of the mounting box. The output shaft of the second drive motor is coaxially fixed with the second screw rod. The slider is slidably connected in the mounting box, and the slider is threadedly connected to the second screw rod. The mounting block is provided outside the mounting box, and the mounting block is fixedly connected to the slider. The first laser sensor and the second laser sensor are both mounted on the mounting block.

9. The lithium battery pole piece coating thickness detection device according to claim 8, characterized in that: The two correction components are symmetrically arranged along the pole piece.

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