Lithium battery pole piece thickness detection device with limiting function

Abstract

The invention discloses a lithium battery pole piece thickness detection device with a limiting function, and relates to the technical field of intelligent sensor detection. Comprising a base, a winding assembly, an electric sliding table, a support, a thickness gauge, a tensioning attaching mechanism and a lining plate, after a coiled material is adsorbed and fixed by negative pressure, a vacuum tensioning roller and a vacuum shaft are locked, the vacuum shaft is driven to deflect by a small angle, the vacuum tensioning roller is made to oppositely tension the two ends of the coiled material while the adsorption state is kept, and the thickness of the coiled material is measured. And the coiled material is unfolded and flatly laid on the lining plate, so that local wrinkles and waves are further eliminated, and the flatness of the coiled material in a spreading state is improved. Negative pressure adsorption is carried out on the coiled material through the vacuum tensioning roller, and the coiled material is supported by the lining plate, so that the whole coiled material is downwards attached and tightly pressed on the surface of the lining plate, the coiled material is prevented from tilting or suspending in the detection area due to self weight, residual tension or springback, and a stable thickness measuring plane is provided for thickness detection.

Description

Technical Field

[0001] This invention relates to the field of intelligent sensor detection technology, specifically a lithium battery electrode thickness detection device with a limiting function. Background Technology

[0002] A lithium battery electrode thickness detection device is a specialized instrument used to detect the thickness parameters of lithium battery electrodes. This device uses intelligent sensors installed inside to detect the thickness of the electrode within the detection area, and is suitable for electrode production and quality control processes. Lithium battery electrodes are functional sheets formed by uniformly coating positive or negative electrode active materials onto the surface of a thin metal foil, used to store and release electrical energy. The consistency of their thickness has a significant impact on battery performance.

[0003] Existing lithium battery electrode thickness detection devices are susceptible to problems during thickness measurement due to the flexibility of the coil material. The coil material is prone to warping, suspension, wrinkling, or misalignment within the detection area, leading to instability of the detection reference surface and affecting the accuracy and consistency of thickness measurement. Conventional mechanisms rely on guide rollers for conveying or fixing the coil material through the detection area, which makes it difficult to simultaneously ensure its flatness, positional stability, and alignment accuracy when the coil material is not being detected. Furthermore, fixing it by pressure can easily scratch the coating material. Summary of the Invention

[0004] The purpose of this invention is to provide a lithium battery electrode thickness detection device with a limiting function to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery electrode thickness detection device with a limiting function, comprising a base, a winding assembly mounted on the base, a bracket mounted on the base, an electric slide table mounted on the bracket, a thickness gauge mounted on the electric slide table, a liner plate mounted on the base, and tensioning and attaching mechanisms symmetrically mounted on the base. The tensioning and attaching mechanism includes two support rods and a vacuum tensioning roller. The support rods are symmetrically mounted on the base, and a vacuum shaft is rotatably mounted on the support rods. Bearings are symmetrically mounted on the vacuum shafts. The vacuum tensioning roller is rotatably mounted on the vacuum shafts via the bearings. A deflection motor is mounted on the support rods, and the output shaft of the deflection motor is connected to one end of the vacuum shaft. Locking devices are symmetrically mounted on the vacuum shafts.

[0006] The testing device is connected to an external control box, which houses a control system that operates the entire device. An electric slide table moves a thickness gauge along a guide rail, simultaneously measuring the thickness of the electrode roll. A liner is placed in the thickness measurement area to support the roll being tested.

[0007] During testing, the lithium battery electrode sheet roll is first installed on the winding assembly. The winding assembly moves the roll by winding and unwinding. The control system intermittently controls the start and stop of the winding assembly. When the winding assembly stops, the tensioning and attaching mechanism is used to adjust the posture of the roll in the thickness detection area. Then, the electric slide table and thickness gauge are started. The electric slide table moves the thickness gauge, which detects the thickness of the roll as it moves. After the detection is completed, the winding assembly is started again, moving the roll forward. This process is repeated to complete the thickness detection of the entire roll.

[0008] The tensioning and attaching mechanism also includes two sets of correction components. A sliding limit rod is installed on the support rod, and the correction components are slidably connected to the sliding limit rod. The vacuum shaft is symmetrically provided with threads, and the thread patterns are arranged opposite to each other. The vacuum shaft is threadedly connected to the correction components through the threads.

[0009] The vacuum shaft is equipped with a negative pressure shell, and the negative pressure shell contains a negative pressure cavity. The top of the negative pressure shell is equipped with several lower slot holes. The negative pressure shell is rotatably connected to the vacuum tensioning roller, and the lower slot holes are connected to the negative pressure cavity.

[0010] The vacuum tension roller is rotatably mounted on the vacuum shaft via bearings. As the roll material advances along the conveying direction, the bottom of the roll material contacts the top of the vacuum tension roller, driving the roller to rotate around the vacuum shaft, while the vacuum shaft remains stationary during this process. The vacuum shaft is positioned at its top and remains stationary along with the roller.

[0011] As the vacuum tensioning roller rotates continuously under the traction of the roll material, the highest point of its outer periphery in contact with the roll material changes continuously along the circumference of the roller body. Meanwhile, the negative pressure shell is always located in the area below the dynamic highest point of the outer periphery of the vacuum tensioning roller, so that the negative pressure adsorption effect of the lower slot hole always acts on the local upper slot hole in the area where the vacuum tensioning roller contacts the roll material.

[0012] Furthermore, the vacuum shaft has a hollow cavity that is connected to the negative pressure chamber, and one end of the vacuum shaft is connected to a vacuum pumping device via a rotating connector.

[0013] The vacuum pumping device is used to evacuate the hollow cavity inside the vacuum shaft. The rotating connector is used to ensure that the vacuum shaft remains connected to the vacuum pumping device when it deflects.

[0014] When the roll material to be tested stops in the thickness detection area, the control system activates the vacuum pump, which evacuates air from the hollow cavity inside the vacuum tension roller, creating a negative pressure state inside the cavity. Since the hollow cavity and the negative pressure cavity are interconnected, the negative pressure cavity is simultaneously under negative pressure. Under this negative pressure, the lower slot at the top of the negative pressure cavity generates a negative suction force, which is transmitted to the outer surface of the top of the vacuum tension roller through the upper slot in the corresponding area, causing the vacuum tension roller to adsorb and fix the roll material on it. The two symmetrically arranged vacuum tension rollers simultaneously apply a downward suction force to the roll material, causing the entire roll material to adhere downwards and be tightly pressed against the liner surface. This prevents the roll material from lifting or suspending itself in the detection area due to its own weight, residual tension, or rebound, thus providing a stable thickness measurement plane.

[0015] Furthermore, the correction component includes a sliding member, which is slidably connected to a sliding limit rod and threadedly connected to a vacuum shaft. A push rod is symmetrically and slidably mounted on the sliding member, and a correction push head is mounted on the push rod. The correction push head is provided with a correction groove, and a buffer spring is installed between the correction push head and the sliding member.

[0016] When the deflection motor drives the vacuum shaft to deflect at a small angle on the support rod, the thread on the vacuum shaft deflects synchronously with it. The thread engages with the sliding component, causing the vacuum shaft to drive the sliding component to slide linearly along the sliding limit rod direction during deflection. The sliding component further drives the push rod and the alignment push head to move synchronously. Because the threads on the vacuum shaft are symmetrically arranged, a single vacuum shaft can simultaneously drive two sets of sliding components to move closer together during deflection, allowing the alignment push heads on both sides to apply pressure to the sides of the roll material, thus achieving centering alignment of the roll material through synchronous double-sided pressure. Two vacuum shafts located at both ends of the roll material drive corresponding alignment components, allowing a total of four alignment push heads at both ends of the roll material to participate in centering and alignment simultaneously, improving the stability and accuracy of alignment. During the pressure application of the alignment push head to the sides of the roll material, the push rod can retract relative to the sliding component, compressing the buffer spring and thus buffering the lateral force applied by the alignment push head, preventing damage to the sides of the roll material due to excessive pressure.

[0017] After the roll material is tensioned, laid flat, and aligned, the control system activates the thickness gauge to detect the thickness.

[0018] Furthermore, the vacuum tensioning roller has several corrugated grooves at both ends, and the locking device is engaged with the corrugated grooves.

[0019] Furthermore, the locking device includes a housing, which is mounted on a vacuum shaft. Several sliding clips are slidably installed inside the housing. The ends of the sliding clips penetrate the housing and engage with corrugated grooves. A return spring is installed between the sliding clips and the housing. An electromagnetic ring is installed inside the housing.

[0020] Initially, several sliding clips engage with the corrugated grooves on the vacuum tension roller, locking the roller to the vacuum shaft and preventing it from rotating. When the testing operation begins, the control system activates the electromagnetic ring. The energized ring generates a magnetic force that attracts the tail end of the sliding clips, stretching the return spring. The sliding clips then slide and retract into the housing, breaking the engagement and locking with the vacuum tension roller, allowing it to rotate on the vacuum shaft.

[0021] After the vacuum tensioning roller completes the negative pressure adsorption of the roll material, the control system controls the electromagnetic ring to de-energize. After the electromagnetic ring is de-energized, the reset spring retracts and drives the sliding chuck to spring back outward, so that the sliding chuck extends out of the outer shell again and engages with the corrugated groove on the vacuum tensioning roller, thereby realizing the locking connection between the vacuum tensioning roller and the vacuum shaft.

[0022] After locking is completed, the control system starts the deflection motor, which drives the vacuum shaft to deflect at a small angle. The vacuum shaft, through the locking device, synchronously drives the vacuum tensioning roller to deflect at the same angle. The two sets of deflection motors located on both sides of the roll material drive the corresponding vacuum shafts to deflect in opposite directions. This allows the two vacuum tensioning rollers to maintain negative pressure adsorption on the roll material, pulling the two ends of the roll material in opposite directions. This causes the roll material to be unfolded and laid flat on the backing plate, further eliminating local wrinkles and waves, and improving the flatness of the rolled material in its unfolded state.

[0023] Furthermore, the vacuum tensioning roller is provided with several upper groove holes in the circumferential direction.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. After the roll material is fixed by negative pressure adsorption, the vacuum tensioning roller and the vacuum shaft are locked and the vacuum shaft is driven to deflect at a small angle. This allows the vacuum tensioning roller to tension both ends of the roll material in opposite directions while maintaining the adsorption state. This causes the roll material to be unfolded and laid flat on the backing plate, further eliminating local wrinkles and waves and improving the flatness of the roll material in its unfolded state.

[0025] 2. The vacuum tensioning roller applies negative pressure to the roll material, and with the support of the liner plate, the roll material is attached downwards and pressed tightly against the surface of the liner plate. This prevents the roll material from lifting or hanging in the detection area due to its own weight, residual tension or rebound, thus providing a stable thickness measurement plane for thickness detection.

[0026] 3. By utilizing the threaded transmission caused by the deflection of the vacuum shaft, the correction pusher moves synchronously to the side of the roll material during the tensioning process, and applies symmetrical compression to both sides of the roll material to achieve centering and correction of the roll material in the spread state, avoiding deviation caused by unilateral stretching or uneven tension.

[0027] 4. Four correction heads are driven by two vacuum shafts to simultaneously center and correct the web at both ends of the web, making the correction force more evenly distributed along the length of the web, reducing stress concentration caused by local correction, and improving the stability and accuracy of the correction process.

[0028] 5. When the correction pusher squeezes the side of the roll material, the lateral squeezing force is buffered by the retraction of the push rod and the compression of the buffer spring, so as to prevent the correction force from being too large and causing squeezing damage to the edge of the roll material, and improve the adaptability of the device to roll materials of different materials and thicknesses. Attached Figure Description

[0029] Figure 1 This is a perspective view of the thickness detection device of the present invention. Figure 2 This is a perspective view of the thickness detection device of the present invention; Figure 3 This is a perspective view of the tensioning and attaching mechanism of the present invention; Figure 4 For the present invention Figure 3 A magnified view of a portion of region A in the middle; Figure 5 This is a perspective view of the lock of the present invention; Figure 6 This is a perspective view of the frame pole of the present invention; Figure 7 For the present invention Figure 6 A magnified view of a portion of region B in the middle; Figure 8 This is a perspective view of the vacuum tensioning roller of the present invention; Figure 9 This is a perspective view of the vacuum shaft of the present invention.

[0030] In the diagram: 1. Base; 2. Rewinding assembly; 3. Electric slide table; 4. Support; 5. Thickness gauge; 6. Tensioning and attaching mechanism; 7. Liner plate; 61. Frame rod; 62. Vacuum shaft; 63. Vacuum tensioning roller; 64. Bearing; 65. Locking device; 66. Correction assembly; 67. Deflection motor; 611. Sliding limit rod; 621. Hollow cavity; 622. Thread; 623. Negative pressure shell; 624. Lower slot hole; 625. Negative pressure chamber; 631. Upper slot hole; 632. Corrugated groove; 651. Outer shell; 652. Sliding chuck; 653. Return spring; 654. Electromagnetic ring; 661. Sliding component; 662. Push rod; 663. Buffer spring; 664. Correction push head. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1-9 As shown, the present invention provides a technical solution for a lithium battery electrode thickness detection device with a limiting function: including a base 1, a winding assembly 2 installed on the base 1, a bracket 4 installed on the base 1, an electric slide 3 installed on the bracket 4, a thickness gauge 5 installed on the electric slide 3, a liner 7 installed on the base 1, and tensioning and attaching mechanisms 6 symmetrically installed on the base 1. The tensioning and attaching mechanism 6 includes two support rods 61 and a vacuum tensioning roller 63. The support rods 61 are symmetrically mounted on the base 1. A vacuum shaft 62 is rotatably mounted on the support rods 61. Bearings 64 are symmetrically mounted on the vacuum shaft 62. The vacuum tensioning roller 63 is rotatably mounted on the vacuum shaft 62 through the bearings 64. A deflection motor 67 is mounted on the support rods 61. The output shaft of the deflection motor 67 is connected to one end of the vacuum shaft 62. Locking devices 65 are symmetrically mounted on the vacuum shaft 62.

[0033] The testing device is connected to an external control box, which houses a control system that operates the entire testing device. An electric slide table 3 drives a thickness gauge 5 along a guide rail, and the thickness gauge 5 measures the thickness of the electrode roll material using an internal intelligent sensor as it moves. A liner plate 7 is placed in the thickness detection area to support the roll material to be tested.

[0034] The tensioning and attaching mechanism 6 also includes two sets of correction components 66. A sliding limit rod 611 is installed on the support rod 61. The correction component 66 is slidably connected to the sliding limit rod 611. The vacuum shaft 62 is symmetrically provided with threads 622. The threads 622 are arranged opposite to each other. The vacuum shaft 62 is connected to the correction component 66 through the threads 622.

[0035] The vacuum shaft 62 is provided with a negative pressure shell 623, and a negative pressure cavity 625 is provided inside the negative pressure shell 623. The top of the negative pressure shell 623 is provided with several lower groove holes 624. The negative pressure shell 623 is rotatably connected to the vacuum tension roller 63, and the lower groove holes 624 are connected to the negative pressure cavity 625.

[0036] The vacuum tensioning roller 63 is provided with several upper groove holes 631 in the circumferential direction.

[0037] The vacuum tension roller 63 is rotatably mounted on the vacuum shaft 62 via a bearing 64. As the roll material moves forward in the conveying direction, the bottom of the roll material contacts the top of the vacuum tension roller 63, driving the vacuum tension roller 63 to rotate around the vacuum shaft 62, while the vacuum shaft 62 remains stationary during this process. The vacuum shaft 62 is positioned at its top and remains stationary together with the vacuum shaft 62.

[0038] As the vacuum tension roller 63 rotates continuously under the traction of the roll material, the highest point of its outer periphery in contact with the roll material changes continuously along the circumference of the roller body. Meanwhile, the negative pressure shell 623 is always located in the area below the dynamic highest point of the outer periphery of the vacuum tension roller 63, so that the negative pressure adsorption effect of the lower slot hole 624 always acts on the local upper slot hole 631 in the area where the vacuum tension roller 63 contacts the roll material.

[0039] The vacuum shaft 62 has a hollow cavity 621 inside, which is connected to the negative pressure cavity 625. One end of the vacuum shaft 62 is connected to a vacuum pumping device via a rotating connector.

[0040] The vacuum pumping device is used to evacuate the hollow cavity 621 inside the vacuum shaft 62. The rotating connector is used to ensure that the vacuum shaft 62 remains connected to the vacuum pumping device when it deflects.

[0041] The vacuum tensioning roller 63 has several corrugated grooves 632 at both ends, and the locking device 65 is engaged with the corrugated grooves 632.

[0042] The locking device 65 includes a housing 651, which is mounted on a vacuum shaft 62. Several sliding heads 652 are slidably installed inside the housing 651. The ends of the sliding heads 652 penetrate the housing 651 and are engaged with the corrugated grooves 632. A return spring 653 is installed between the sliding heads 652 and the housing 651. An electromagnetic ring 654 is installed inside the housing 651.

[0043] In the initial state, several sliding clips 652 engage with the corrugated grooves 632 on the vacuum tension roller 63, thereby locking the vacuum tension roller 63 to the vacuum shaft 62, preventing the vacuum tension roller 63 from rotating on the vacuum shaft 62. When the testing operation begins, the control system activates the electromagnetic ring 654. The energized electromagnetic ring 654 generates a magnetic force that attracts the tail end of the sliding clip 652, stretching the return spring 653. The sliding clip 652 slides and retracts into the outer casing 651, thereby breaking the engagement lock with the vacuum tension roller 63, allowing the vacuum tension roller 63 to rotate on the vacuum shaft 62.

[0044] The correction assembly 66 includes a slider 661, which is slidably connected to a sliding limit rod 611. The slider 661 is threaded 622 to a vacuum shaft 62. A push rod 662 is symmetrically and slidably mounted on the slider 661. A correction push head 664 is mounted on the push rod 662. The correction push head 664 is provided with a correction groove. A buffer spring 663 is installed between the correction push head 664 and the slider 661.

[0045] The working principle of this invention is as follows: During testing, the lithium battery electrode sheet roll is first installed on the winding assembly 2. The winding assembly 2 moves the roll by winding and unwinding. The control system intermittently controls the start and stop of the winding assembly 2. When the winding assembly 2 stops, the tensioning and attaching mechanism 6 is used to adjust the posture of the roll in the thickness detection area. Then, the electric slide 3 and the thickness gauge 5 are started. The electric slide 3 moves the thickness gauge 5. The thickness gauge 5 detects the thickness of the roll while moving. After the detection is completed, the winding assembly 2 is started again, moving the roll forward. This process is repeated to complete the thickness detection of the entire roll.

[0046] When the roll material to be tested stops in the thickness detection area, the control system activates the vacuum pumping device. The vacuum pumping device evacuates air from the hollow cavity 621 inside the vacuum tension roller 63, creating a negative pressure state inside the hollow cavity 621. Since the hollow cavity 621 and the negative pressure cavity 625 are interconnected, the negative pressure cavity 625 is simultaneously under negative pressure. Under the action of negative pressure, the lower slot 624 at the top of the negative pressure cavity 625 generates negative pressure suction, which is transmitted to the outer peripheral surface of the top of the vacuum tension roller 63 through the upper slot 631 in the corresponding area, causing the vacuum tension roller 63 to adsorb and fix the roll material on it. The two symmetrically arranged vacuum tension rollers 63 simultaneously apply a downward adsorption force to the roll material, causing the entire roll material to adhere downwards and be tightly pressed against the surface of the liner 7, preventing the roll material from lifting or suspending in the detection area due to its own weight, residual tension, or rebound, thereby providing a stable thickness measurement plane for thickness detection.

[0047] After the vacuum tensioning roller 63 completes the negative pressure adsorption of the roll material, the control system controls the electromagnetic ring 654 to de-energize. After the electromagnetic ring 654 is de-energized, the reset spring 653 retracts and drives the sliding clamp 652 to spring outward, so that the sliding clamp 652 extends out of the outer shell 651 again and engages with the corrugated groove 632 on the vacuum tensioning roller 63, thereby realizing the locking connection between the vacuum tensioning roller 63 and the vacuum shaft 62.

[0048] After locking is completed, the control system starts the deflection motor 67, which drives the vacuum shaft 62 to deflect at a small angle. The vacuum shaft 62, through the locking device 65, synchronously drives the vacuum tension roller 63 to deflect at the same angle. The two sets of deflection motors 67 located on both sides of the roll material drive the corresponding vacuum shafts 62 to deflect in opposite directions, so that the two vacuum tension rollers 63, while maintaining negative pressure adsorption on the roll material, pull the two ends of the roll material in opposite directions, thereby unfolding and laying the roll material flat on the backing plate 7, further eliminating local wrinkles and waves, and improving the flatness of the roll material in the unfolded state.

[0049] When the deflection motor 67 drives the vacuum shaft 62 to deflect at a small angle on the support rod 61, the thread 622 on the vacuum shaft 62 deflects synchronously with the vacuum shaft 62. The thread 622 cooperates with the sliding member 661, so that during the deflection process, the vacuum shaft 62 drives the sliding member 661 to slide linearly along the direction of the sliding limit rod 611 through the thread 622 transmission. The sliding member 661 further drives the push rod 662 and the correction push head 664 to move synchronously. Since the thread 622 on the vacuum shaft 62 is symmetrically arranged, a single vacuum shaft 62 can simultaneously drive two sets of sliding components to move closer to each other during deflection, so that the correction push heads 664 on both sides apply extrusion force to the sides of the roll material, thereby achieving centering alignment of the roll material through synchronous extrusion on both sides. The two vacuum shafts 62 set at both ends of the roll material drive the corresponding correction components 66 respectively, so that a total of four correction push heads 664 at both ends of the roll material participate in centering and correction at the same time, improving the stability and accuracy of correction. During the process of the straightening push head 664 squeezing the side of the roll material, the push rod 662 can retract relative to the sliding member 661 and drive the buffer spring 663 to compress, thereby buffering the lateral force applied by the straightening push head 664 and preventing damage to the side of the roll material due to excessive squeezing force.

[0050] After the roll material is tensioned, laid flat, and aligned, the control system activates the thickness gauge 5 to detect the thickness.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A lithium battery electrode thickness detection device with a limiting function, comprising a base (1), a winding assembly (2) mounted on the base (1), a bracket (4) mounted on the base (1), an electric slide stage (3) mounted on the bracket (4), and a thickness gauge (5) mounted on the electric slide stage (3), characterized in that: A liner plate (7) is installed on the base (1), and a tensioning and attaching mechanism (6) is symmetrically installed on the base (1). The tensioning and attaching mechanism (6) includes two support rods (61) and a vacuum tensioning roller (63). The support rods (61) are symmetrically mounted on the base (1). A vacuum shaft (62) is rotatably mounted on the support rods (61). A bearing (64) is symmetrically mounted on the vacuum shaft (62). The vacuum tensioning roller (63) is rotatably mounted on the vacuum shaft (62) through the bearing (64). A deflection motor (67) is mounted on the support rods (61). The output shaft of the deflection motor (67) is connected to one end of the vacuum shaft (62). A locking device (65) is symmetrically mounted on the vacuum shaft (62).

2. The lithium battery electrode thickness detection device with limiting function according to claim 1, characterized in that: The tensioning and attaching mechanism (6) also includes two sets of correction components (66). A sliding limit rod (611) is installed on the support rod (61). The correction component (66) is slidably connected to the sliding limit rod (611). The vacuum shaft (62) is symmetrically provided with threads (622). The threads (622) are arranged opposite to each other. The vacuum shaft (62) is connected to the correction component (66) thread (622) through the threads (622).

3. The lithium battery electrode thickness detection device with limiting function according to claim 1, characterized in that: The vacuum shaft (62) is provided with a negative pressure shell (623), and a negative pressure cavity (625) is provided inside the negative pressure shell (623). The top of the negative pressure shell (623) is provided with a plurality of lower slot holes (624). The negative pressure shell (623) is rotatably connected to the vacuum tension roller (63), and the lower slot holes (624) are connected to the negative pressure cavity (625).

4. The lithium battery electrode thickness detection device with limiting function according to claim 3, characterized in that: The vacuum shaft (62) has a hollow cavity (621) inside, which is connected to the negative pressure cavity (625). One end of the vacuum shaft (62) is connected to a vacuum pumping device via a rotating connector.

5. A lithium battery electrode thickness detection device with limiting function according to claim 2, characterized in that: The correction assembly (66) includes a sliding member (661), which is slidably connected to a sliding limit rod (611). The sliding member (661) is threaded (622) to a vacuum shaft (62). A push rod (662) is symmetrically and slidably mounted on the sliding member (661). A correction push head (664) is mounted on the push rod (662). The correction push head (664) is provided with a correction groove. A buffer spring (663) is installed between the correction push head (664) and the sliding member (661).

6. The lithium battery electrode thickness detection device with limiting function according to claim 3, characterized in that: The vacuum tensioning roller (63) has several corrugated grooves (632) at both ends, and the locking device (65) is engaged with the corrugated grooves (632).

7. A lithium battery electrode thickness detection device with limiting function according to claim 6, characterized in that: The locking device (65) includes a housing (651) which is mounted on a vacuum shaft (62). A plurality of sliding clips (652) are slidably installed inside the housing (651). The ends of the sliding clips (652) penetrate the housing (651) and are fitted into a corrugated groove (632). A return spring (653) is installed between the sliding clips (652) and the housing (651). An electromagnetic ring (654) is installed inside the housing (651).

8. A lithium battery electrode thickness detection device with limiting function according to claim 3, characterized in that: The vacuum tensioning roller (63) is provided with several upper grooves (631) in the circumferential direction.

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