A lithium battery pole piece thickness measurement system

Abstract

The present invention relates to the technical field of lithium battery pole piece thickness measurement, and in particular to a lithium battery pole piece thickness measurement system, comprising a workbench, a material receiving rod movably plugged into the workbench, an inner circle measuring rod fixedly connected to the workbench, a connecting rod slidingly arranged inside the inner circle measuring rod, a fixed measuring rod fixedly connected to the inner circle measuring rod, a measuring drive mechanism slidingly arranged on the fixed measuring rod, a movable measuring rod arranged on one side of the fixed measuring rod, a transmission mechanism rotatably connected to the inner circle measuring rod, a material discharge rod slidingly arranged on the inner circle measuring rod, and the provision of the inner circle measuring rod facilitates the placement of an annular pole piece. At the same time, in conjunction with the fixed measuring rod, the adjustable movable measuring rod and the outer circle measuring rod, the positioning and stability problems during the measurement of an annular pole piece can be effectively solved. By performing multi-point thickness measurements on the inner circle, outer circle and both sides, the thickness changes of the annular pole piece can be comprehensively evaluated.

Description

Technical Field

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

[0002] Lithium battery pole pieces are key components of lithium batteries, primarily comprising positive and negative electrodes. The quality and performance of pole pieces directly impact the capacity, efficiency, lifespan, and safety of lithium batteries. Pole pieces are formed by coating, drying, and rolling electrode materials, then bonding them to a metal foil substrate (aluminum foil for the positive electrode and copper foil for the negative electrode). Measuring the thickness of lithium battery pole pieces is a critical step in the lithium battery manufacturing process, as their thickness directly impacts the battery's performance, capacity, internal resistance, and cycle life. Excessively thin pole pieces can result in insufficient capacity, while excessively thick ones can increase the battery's internal resistance, impacting efficiency and safety.

[0003] In the prior art, document CN119164295A provides a device for measuring the coating thickness of a lithium battery electrode. This device uses two first laser sensors positioned on the upper and lower sides of the electrode to detect the thickness of the electrode after coating. This indirect detection method does not affect the electrode, enabling continuous testing without stopping the machine. It has the advantages of high detection accuracy and fast measurement speed. By providing a drive unit to drive the mobile assembly, which in turn drives the first laser sensor to move horizontally, it can detect the thickness of different positions on the electrode, making the detection more comprehensive and enabling better monitoring of electrode quality.

[0004] Existing laser sensors are typically used for flat surface inspection, making it difficult to accurately locate and effectively measure annular pole pieces. Due to the irregular geometry of the annular pole piece, the laser sensor may not always be accurately aligned with the measurement area of ​​the pole piece, affecting the accuracy and consistency of the measurement.

[0005] In summary, the prior art lacks a thickness measurement technology for annular pole pieces. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a lithium battery pole piece thickness measurement system.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: a lithium battery electrode thickness measurement system, including a workbench, a receiving rod is movably inserted into the workbench, an inner circle measuring rod is fixedly connected to the workbench, a connecting rod is slidingly provided inside the inner circle measuring rod, a fixed measuring rod is fixedly connected to the inner circle measuring rod, a measuring drive mechanism is slidingly provided on the fixed measuring rod, a movable measuring rod is provided on one side of the fixed measuring rod, a transmission mechanism is rotatably connected to the inner circle measuring rod, and a discharge rod is slidingly provided on the inner circle measuring rod.

[0008] Preferably, the recessed portion at the top end of the material receiving rod is matched with one end of the connecting rod, and the bottom end of the material receiving rod is fixedly connected with an inserting rod, and the inserting rod is movably connected to the workbench.

[0009] Preferably, one end of the connecting rod is rotatably connected to a connecting rod group, the other end of the connecting rod group is rotatably connected to the inner circle measuring rod, one end of the connecting rod group connected to the inner circle measuring rod is fixedly connected to a worm gear, one side of the worm gear is meshingly provided with a worm, the worm is rotatably connected to the inner circle measuring rod, and the top end of the worm is fixedly connected to a transmission wheel.

[0010] Preferably, a motor A is fixedly connected to the inner wall of the fixed measuring rod, and a threaded rod is fixedly connected to the output end of the motor A.

[0011] Preferably, the measuring drive mechanism includes a movable seat, the movable seat is slidingly matched with the fixed measuring rod, the movable seat is threadedly connected to the threaded rod, an outer circle measuring rod is fixedly connected to one side of the movable seat, a motor B is fixedly connected to the movable seat, a driving wheel is fixedly connected to the output end of the motor B, rubber wheels are rotatably connected on both sides of the movable seat, a driven wheel is fixedly connected to one end of the rubber wheel, and the driven wheel is meshed with the driving wheel for transmission.

[0012] Preferably, an adjustment seat is rotatably connected to the movable measuring rod, an electric push rod is fixedly connected to one end of the adjustment seat, the electric push rod is fixedly connected to the fixed measuring rod, a motor C is fixedly connected to one side of the adjustment seat, the output end of the motor C is fixedly connected to the movable measuring rod, and an arc-shaped rack is fixedly connected to the top of the movable measuring rod.

[0013] Preferably, the transmission mechanism includes a universal joint, which is rotatably connected to the inner circle measuring rod, a cylindrical cam is fixedly connected to one end of the universal joint, and a transmission rod is slidingly fitted at the other end of the universal joint, and the other end of the transmission rod passes through the fixed measuring rod and is rotatably connected to the adjustment seat.

[0014] Preferably, the transmission rod is located on one side of the adjustment seat and has a plurality of transmission teeth in a ring-shaped structure and is rotatably connected thereto. A tension spring is fixedly connected to the transmission rod, and the other end of the tension spring is fixedly connected to the transmission rod. A slotted gear is rotatably connected to the end of the transmission rod, and the tooth grooves on the inner wall of the slotted gear are movably engaged with the transmission teeth for transmission, and the slotted gear is engaged with the arc-shaped rack for transmission.

[0015] Preferably, a transmission rack is fixedly connected to one end of the blanking rod, and the transmission rack is meshed with the transmission wheel for transmission. A push rod is rotatably connected to the blanking rod, and a movable block is rotatably connected to the other end of the push rod. The protrusion on the inner wall of the movable block is slidably fitted with the inner wall of the annular groove on the cylindrical cam.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The inner circle measuring rod facilitates the placement of the annular pole piece. Furthermore, the combination of a fixed measuring rod, an adjustable movable measuring rod, and an outer circle measuring rod effectively addresses positioning and stability issues during annular pole piece measurement. Multi-point thickness measurements on the inner circle, outer circle, and both sides enable a comprehensive assessment of the thickness variation of the annular pole piece. The inner and outer circles of an annular pole piece typically have different thicknesses. This design covers different areas of the pole piece, ensuring comprehensive measurement, avoiding omissions in critical areas, and providing more accurate quality monitoring data. A rotating rubber wheel drives the annular pole piece to rotate, ensuring the sensor can measure every angle and position of the pole piece, improving the comprehensiveness and accuracy of detection. A feed rod is provided, and when the movable measuring rod rotates, the transmission mechanism drives the feed rod to move, automatically pushing the measured annular pole piece down. This not only improves detection accuracy and production efficiency, but also reduces manual intervention and error rates, adapting to the needs of large-scale production. 3. By setting up a connecting rod and a receiving rod, before the feeding rod moves to push the annular electrode to be fed, the connecting rod can be removed to bridge the gap between the inner circle measuring rod and the receiving rod, making it easier for multiple annular electrode pieces to be placed on the receiving rod. After the electrodes are fully placed, the receiving rod can be replaced. This not only improves production efficiency and stability, but also simplifies the operation process, reduces manual operations, and improves the automation level of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a lithium battery pole piece thickness measurement system of the present invention when measuring an annular pole piece;

[0019] Figure 2 A partial cross-sectional schematic diagram of a lithium battery electrode thickness measurement system according to the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of a lithium battery electrode thickness measurement system including a connecting rod according to the present invention;

[0021] Figure 4 This is a schematic diagram of the connecting rod structure of a lithium battery electrode thickness measurement system of the present invention;

[0022] Figure 5 This is a partial cross-sectional schematic diagram of the structure of a fixed measuring rod and a measuring drive mechanism of a lithium battery electrode thickness measurement system according to the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of a movable measuring rod and other components of a lithium battery electrode thickness measurement system according to the present invention;

[0024] Figure 7 This is a schematic diagram of the transmission mechanism structure of a lithium battery pole piece thickness measurement system of the present invention;

[0025] Figure 8 A lithium battery pole piece thickness measurement system of the present invention Figure 7 A schematic diagram of the cross-section and expansion of the structure A;

[0026] Figure 9 The figure is a schematic diagram of the blanking rod structure of a lithium battery pole piece thickness measurement system of the present invention.

[0027] The following are marked in the figure: 1. Workbench; 2. Material receiving rod; 3. Internal circle measuring rod; 4. Connecting rod; 5. Fixed measuring rod; 6. Measuring drive mechanism; 7. Movable measuring rod; 8. Transmission mechanism; 9. Material discharge rod; 201. Insertion rod; 401. Connecting rod assembly; 402. Worm gear; 403. Worm; 404. Transmission wheel; 501. Motor A; 502. Threaded rod; 601. Moving seat; 602. External circle measuring rod Rod; 603, motor B; 604, driving wheel; 605, rubber wheel; 606, driven wheel; 701, adjustment seat; 702, electric push rod; 703, motor C; 704, arc-shaped rack; 801, universal joint; 802, cylindrical cam; 803, transmission rod; 804, transmission tooth; 805, tension spring; 806, slotted gear; 901, transmission rack; 902, push rod; 903, movable block. DETAILED DESCRIPTION

[0028] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0029] like Figures 1-8The system for measuring the thickness of a lithium battery electrode sheet shown in FIG. 1 includes a workbench 1, with a material receiving rod 2 movably connected to the workbench 1, an inner diameter measuring rod 3 fixedly connected to the workbench 1, a connecting rod 4 slidingly arranged within the inner diameter measuring rod 3, a fixed measuring rod 5 fixedly connected to the inner diameter measuring rod 3, a measurement drive mechanism 6 slidingly arranged on the fixed measuring rod 5, a movable measuring rod 7 provided on one side of the fixed measuring rod 5, a transmission mechanism 8 rotatably connected to the inner diameter measuring rod 3, and a material discharge rod 9 slidingly arranged on the inner diameter measuring rod 3. The inner diameter measuring rod 3, fixed measuring rod 5, movable measuring rod 7, and outer diameter measuring rod 602 are all equipped with contact sensors on the side that contacts the annular electrode sheet to measure the thickness of the annular electrode sheet.

[0030] like Figure 3 As shown, the concave portion at the top of the material receiving rod 2 is matched with one end of the connecting rod 4 , and the bottom end of the material receiving rod 2 is fixedly connected with an inserting rod 201 , which is movably plugged into the workbench 1 .

[0031] like Figure 4 As shown, one end of the connecting rod 4 is rotatably connected to a connecting rod assembly 401, and the other end of the connecting rod assembly 401 is rotatably connected to the inner circle measuring rod 3. The end of the connecting rod assembly 401 connected to the inner circle measuring rod 3 is fixedly connected to a worm gear 402. A worm 403 is meshingly provided on one side of the worm gear 402. The worm 403 is rotatably connected to the inner circle measuring rod 3, and a transmission wheel 404 is fixedly connected to the top of the worm 403. The transmission rack 901 connected to the blanking rod 9 drives the transmission wheel 404 to rotate, so that the transmission wheel 404 drives the worm 403 to rotate, and the worm 403 drives the worm wheel 402 to rotate, which causes the connecting rod assembly 401 connected to the worm gear 402 to rotate, so that the connecting rod assembly 401 can drive the connecting rod 4 to move out.

[0032] like Figure 5 As shown, the inner wall of the fixed measuring rod 5 is fixedly connected to a motor A501, and the output end of the motor A501 is fixedly connected to a threaded rod 502. The motor A501 drives the connected threaded rod 502 to rotate, so that the threaded rod 502 can drive the moving base 601 to move downward.

[0033] like Figure 5As shown, the measuring drive mechanism 6 includes a moving seat 601, which is slidingly matched with the fixed measuring rod 5, and the moving seat 601 is threadedly connected to the threaded rod 502. An outer circular measuring rod 602 is fixedly connected to one side of the moving seat 601, and a motor B603 is fixedly connected to the moving seat 601. The output end of the motor B603 is fixedly connected to a driving wheel 604, and rubber wheels 605 are rotatably connected on both sides of the moving seat 601. A driven wheel 606 is fixedly connected to one end of the rubber wheel 605, and the driven wheel 606 is meshed with the driving wheel 604 for transmission. The movable seat 601 can drive the connected outer circle measuring rod 602 to contact the outer circle of the annular pole piece, and then use the electric push rod 702 to drive the adjustment seat 701 to move, thereby driving the movable measuring rod 7 to contact one side of the annular pole piece. During measurement, the motor B603 is used to drive the connected active wheel 604 to rotate, so that the active wheel 604 can drive the rubber wheel 605 connected to the driven wheel 606 to rotate, so that the rubber wheel 605 can drive the annular pole piece to rotate.

[0034] like Figure 6 As shown, the movable measuring rod 7 is rotatably connected to an adjustment seat 701. An electric push rod 702 is fixedly connected to one end of the adjustment seat 701. The electric push rod 702 is fixedly connected to the fixed measuring rod 5. A motor C703 is fixedly connected to one side of the adjustment seat 701. The output end of the motor C703 is fixedly connected to the movable measuring rod 7. An arc-shaped rack 704 is fixedly connected to the top of the movable measuring rod 7. The motor C703 drives the connected movable measuring rod 7 to rotate.

[0035] like Figure 7 、 Figure 8 As shown, the transmission mechanism 8 includes a universal joint 801, which is rotatably connected to the inner circle measuring rod 3. A cylindrical cam 802 is fixedly connected to one end of the universal joint 801, and a transmission rod 803 is slidingly fitted at the other end of the universal joint 801. The other end of the transmission rod 803 passes through the fixed measuring rod 5 and is rotatably connected to the adjustment seat 701.

[0036] One end of the transmission rod 803, located on one side of the adjustment base 701, is rotatably connected to a plurality of transmission teeth 804 in a ring-shaped structure. A tension spring 805 is fixedly connected to the transmission rod 803, and the other end of the tension spring 805 is fixedly connected to the transmission rod 803. A slotted gear 806 is rotatably connected to the end of the transmission rod 803. The teeth on the inner wall of the slotted gear 806 flexibly mesh with the transmission teeth 804, and the slotted gear 806 meshes with the arc-shaped rack 704. The tension spring 805 ensures that when the movable measuring rod 7 is lowered for measurement, it does not rotate the transmission rod 803. The slotted gear 806, through its internal teeth, drives the transmission rod 803, connected to the transmission teeth 804, to rotate, allowing the transmission rod 803 to rotate the cylindrical cam 802 connected to the universal joint 801.

[0037] like Figure 9 As shown, a transmission rack 901 is fixedly connected to one end of the blanking rod 9, which meshes with the transmission wheel 404 for transmission. A push rod 902 is rotatably connected to the blanking rod 9, and a movable block 903 is rotatably connected to the other end of the push rod 902. The protrusion on the inner wall of the movable block 903 slides in cooperation with the inner wall of the annular groove on the cylindrical cam 802. When the cylindrical cam 802 rotates half a turn, it drives the movable block 903 downward, causing the movable block 903 to move the blanking rod 9 connected to the push rod 902. At this time, the transmission rack 901 connected to the blanking rod 9 drives the transmission wheel 404 to rotate.

[0038] The inner circle measuring rod 3 facilitates the placement of the annular pole piece. Furthermore, the combination of the fixed measuring rod 5, the adjustable movable measuring rod 7, and the outer circle measuring rod 602 effectively addresses positioning and stability issues during annular pole piece measurement. Multi-point thickness measurements on the inner circle, outer circle, and both sides enable a comprehensive assessment of the thickness variation of the annular pole piece. The inner and outer areas of an annular pole piece typically have different thicknesses. This design ensures comprehensive coverage of different pole piece regions, avoiding omissions in critical areas and providing more accurate quality monitoring data.

[0039] Working principle: When it is necessary to measure the thickness of the annular pole piece, first place the annular pole piece to be measured on the inner circle measuring rod 3, and then use the motor A501 to drive the connected threaded rod 502 to rotate, so that the threaded rod 502 can drive the movable seat 601 to move downward, so that the movable seat 601 can drive the connected outer circle measuring rod 602 to contact the outer circle of the annular pole piece, and then use the electric push rod 702 to drive the adjustment seat 701 to move, thereby driving the movable measuring rod 7 to contact one side of the annular pole piece. During measurement, the motor B603 is used to drive the connected active wheel 604 to rotate, so that the active wheel 604 can drive the rubber wheel 605 connected to the driven wheel 606 to rotate, so that the rubber wheel 605 can drive the annular pole piece to rotate, and the annular pole piece is measured in all directions;

[0040] After the measurement is completed, the motor C703 is used to drive the connected movable measuring rod 7 to rotate, releasing the limit on the annular pole piece. Then, the movable measuring rod 7 will drive the slotted gear 806 to rotate through the connected arc-shaped rack 704. At this time, the slotted gear 806 will drive the transmission rod 803 connected to the transmission gear 804 to rotate through the internal tooth groove, so that the transmission rod 803 can drive the cylindrical cam 802 connected to the universal joint 801 to rotate one circle.

[0041] When the cylindrical cam 802 rotates half a circle, it will drive the movable block 903 to move downward, so that the movable block 903 drives the discharge rod 9 connected to the push rod 902 to move. At this time, the transmission rack 901 connected to the discharge rod 9 will drive the transmission wheel 404 to rotate, so that the transmission wheel 404 drives the worm 403 to rotate, so that the worm 403 drives the worm wheel 402 to rotate, so that the connecting rod group 401 connected to the worm wheel 402 rotates, so that the connecting rod group 401 can drive the connecting rod 4 to move out, so that one end of the connecting rod 4 is inserted into the recessed part at the top of the receiving rod 2, and then when the discharge rod 9 continues to move, it will contact and push the annular pole piece, push the annular pole piece onto the receiving rod 2 for placement, and then when the cylindrical cam 802 continues to rotate half a circle, it will drive the discharge rod 9 and the receiving rod 2 to be retracted.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery electrode thickness measurement system, comprising a workbench (1), characterized in that: The workbench (1) is provided with a material receiving rod (2) for movable insertion, the workbench (1) is provided with an inner circle measuring rod (3) for fixed connection, the inner circle measuring rod (3) is provided with a connecting rod (4) for sliding fit, one end of the connecting rod (4) is provided with a connecting rod group (401) for rotational connection, the other end of the connecting rod group (401) is provided with a rotatable connection to the inner circle measuring rod (3), one end of the connecting rod group (401) connected to the inner circle measuring rod (3) is provided with a worm gear (402) for fixed connection, one side of the worm gear (402) is provided with a worm (403) for meshing transmission, the worm gear (403) is provided with a rotatable connection to the inner circle measuring rod (3), the top end of the worm gear (403) is fixedly connected to the inner circle measuring rod (3), and the inner circle measuring rod (3) is provided with a worm gear (403) for meshing transmission. A transmission wheel (404) is provided, a fixed measuring rod (5) is fixedly connected to the inner circle measuring rod (3), a measuring drive mechanism (6) is slidably provided on the fixed measuring rod (5), a movable measuring rod (7) is provided on one side of the fixed measuring rod (5), an adjustment seat (701) is rotatably connected to the movable measuring rod (7), an electric push rod (702) is fixedly connected to one end of the adjustment seat (701), the electric push rod (702) is fixedly connected to the fixed measuring rod (5), a motor C (703) is fixedly connected to one side of the adjustment seat (701), an output end of the motor C (703) is fixedly connected to the movable measuring rod (7), and the movable measuring rod (7) is fixedly connected to the output end of the motor C (703). The top of the measuring rod (7) is fixedly connected with an arc-shaped rack (704), and the inner circle measuring rod (3) is rotatably connected with a transmission mechanism (8), and the transmission mechanism (8) includes a universal joint (801), and the universal joint (801) is rotatably connected with the inner circle measuring rod (3). One end of the universal joint (801) is fixedly connected with a cylindrical cam (802), and the other end of the universal joint (801) is slidably matched with a transmission rod (803), and the other end of the transmission rod (803) passes through the fixed measuring rod (5) and is rotatably connected with the adjustment seat (701). The end of the transmission rod (803) located on one side of the adjustment seat (701) is rotatably connected with a plurality of A transmission tooth (804) is provided, and a tension spring (805) is fixedly connected to the transmission rod (803). The other end of the tension spring (805) is fixedly connected to the transmission rod (803). A slotted gear (806) is rotatably connected to the end of the transmission rod (803). The tooth groove on the inner wall of the slotted gear (806) is movably engaged with the transmission tooth (804) for transmission. The slotted gear (806) is engaged with the arc-shaped rack (704) for transmission. A blanking rod (9) is slidably fitted on the inner circle measuring rod (3). One end of the blanking rod (9) is fixedly connected to a transmission rack (901). The transmission rack (901) is engaged with the transmission wheel (404) for transmission.

2. A lithium battery pole piece thickness measurement system according to claim 1, characterized in that: The top concave portion of the material receiving rod (2) is adapted to one end of the connecting rod (4); the bottom end of the material receiving rod (2) is fixedly connected to an inserting rod (201); and the inserting rod (201) is movably inserted into the workbench (1).

3. The lithium battery pole piece thickness measurement system according to claim 1, characterized in that: A motor A (501) is fixedly connected to the inner wall of the fixed measuring rod (5), and a threaded rod (502) is fixedly connected to the output end of the motor A (501).

4. A lithium battery pole piece thickness measurement system according to claim 3, characterized in that: The measuring drive mechanism (6) comprises a movable seat (601), the movable seat (601) is arranged to slide in cooperation with the fixed measuring rod (5), the movable seat (601) is threadedly connected to the threaded rod (502), one side of the movable seat (601) is fixedly connected to the outer circle measuring rod (602), the movable seat (601) is fixedly connected to the motor B (603), the output end of the motor B (603) is fixedly connected to the driving wheel (604), both sides of the movable seat (601) are rotatably connected to rubber wheels (605), one end of the rubber wheel (605) is fixedly connected to a driven wheel (606), and the driven wheel (606) is meshed with the driving wheel (604) for transmission.

5. The lithium battery pole piece thickness measurement system according to claim 1, characterized in that: A push rod (902) is rotatably connected to the discharge rod (9), and a movable block (903) is rotatably connected to the other end of the push rod (902). The protrusion on the inner wall of the movable block (903) is slidably matched with the inner wall of the annular groove on the cylindrical cam (802).

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