System and method for reducing tension roll chatter of lithium battery separator

Abstract

The present application relates to the technical field of lithium battery diaphragm preparation, and discloses a system and method for reducing the stretch roller disturbance of a lithium battery diaphragm. The system for reducing the stretch roller disturbance of a lithium battery diaphragm comprises two roller bodies, a correction device and a detection device. A gap is arranged between the two roller bodies. The two roller bodies are arranged on a driving device, and the driving device drives the pair of roller bodies to rotate. The correction device is arranged on the roller body. The detection device comprises a radiation emitting end, a radiation receiving end and a plurality of detection ends. The plurality of detection ends are arranged in the roller body along the axis of the roller body. The radiation emitting end and the radiation receiving end are arranged at the two ends of the roller body, respectively. The method for reducing the stretch roller disturbance of a lithium battery diaphragm comprises the following steps: the radiation emitting end emits radiation towards the radiation receiving end; the radiation is received by the feedback part on the two sides of the micropore, and the feedback offset is fed back to the corrector; and the corrector adjusts the roller body disturbance to the point where the radiation passes through the micropore. The technical problem that the real-time deformation of the roller body is difficult to monitor and compensate during the stretching of the lithium battery diaphragm in the related art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery separator preparation, and in particular to a system and method for reducing the disturbance of a lithium battery separator stretching roller. BACKGROUND

[0002] In the stretching process of a lithium battery separator, the static disturbance of the stretching roller (especially a large, high-speed roller body) and the dynamic disturbance generated under the coupling action of heat and force result in the inability to dynamically detect and correct the disturbance of the roller body in real time, making it difficult to monitor and compensate for the real-time deformation of the roller body during production, and thus the actual precision during the stretching of the separator cannot be guaranteed. SUMMARY

[0003] The present application discloses a system and method for reducing the disturbance of a lithium battery separator stretching roller to solve the technical problem of the inability to monitor and compensate for the real-time deformation of the roller body during the stretching of the lithium battery separator in the related art.

[0004] To solve the above problems, the present application adopts the following technical solutions:

[0005] In a first aspect, the present application discloses a system for reducing the disturbance of a lithium battery separator stretching roller, comprising:

[0006] Two roller bodies are provided with a gap between them for the passage and stretching of the separator; the two roller bodies are arranged on a driving device, and the driving device drives the pair of roller bodies to rotate;

[0007] A correction device is arranged on the roller body for adjusting the disturbance of the roller body;

[0008] A detection device comprises a ray emitting end, a ray receiving end, and a plurality of detection ends; the plurality of detection ends are arranged in the roller body along the axis of the roller body; the ray emitting end and the ray receiving end are arranged at the two ends of the roller body, respectively;

[0009] The rays emitted by the ray emitting end pass through the plurality of detection ends in sequence along a preset path and reach the ray receiving end; the detection ends feed back the ray offset to the correction device.

[0010] Optionally, the correction device comprises a plurality of correctors; the plurality of correctors are arranged on the roller body along the axis of the roller body; the correctors are electrically connected to the detection ends in correspondence.

[0011] Optionally, the detection ends are arranged around the axis of the roller body and are located near the side wall of the roller body in the roller body;

[0012] The positions of the correctors are consistent with the positions of the detection ends, and the action points of each corrector correspond to the positions of the corresponding detection ends in the axial direction of the roller body.

[0013] Optionally, the detection end comprises a micro-hole and a feedback part; the feedback part is arranged on both sides of the micro-hole and is arranged along the radial direction of the roller body.

[0014] When the rays emitted by the ray emitting end are received by the feedback part, the ray deviation amount signal is fed back to the corrector through electrical connection.

[0015] Optionally, the corrector comprises a driving assembly and a contact piece; the driving assembly drives the contact piece to move along the radial direction of the roller body; and the contact piece is arranged in close contact with the outer sidewall of the roller body.

[0016] Optionally, the corrector further comprises a control unit; the feedback part transmits the ray deviation amount signal to the control unit; the control unit sends a driving instruction to the driving assembly of the corrector according to the deviation amount signal, and pushes or stretches along the radial direction of the roller body to adjust the eccentricity of the roller body until the rays emitted by the ray emitting end are received by the ray receiving end in turn.

[0017] Optionally, the contact piece comprises a clamp ring arranged on the side of the roller body away from the diaphragm and in sliding connection with the roller body.

[0018] Optionally, the driving assembly comprises a telescopic rod connected with the clamp ring, and drives the clamp ring to push or stretch along the radial direction of the roller body to adjust the eccentricity of the roller body.

[0019] In a second aspect, the application also discloses a method for reducing the eccentricity of a lithium battery diaphragm stretching roller, which is applied to the system for reducing the eccentricity of a lithium battery diaphragm stretching roller in the first aspect and comprises the following steps.

[0020] S1: Start the ray emitting end to make it emit rays to be transmitted along a preset path towards the ray receiving end;

[0021] S2: If the ray receiving end receives the rays that have passed through each detection end in turn, it is determined that the eccentricity of the roller body meets the standard, and the diaphragm stretching can be performed.

[0022] S3: If the rays are received by the detection end, the detection end detects and feeds back the ray deviation amount to the corresponding correction device.

[0023] S4: The correction device pushes or stretches the roller body along the radial direction of the roller body according to the ray deviation amount, and repeats steps S1-S3 until the rays can pass through each detection end.

[0024] Optionally, in step S1, when the roller body rotates under the driving of the driving device, the rays emitted by the ray emitting end pass through the detection ends arranged around the axis of the roller body in turn.

[0025] The technical scheme adopted by the application can achieve the following beneficial effects:

[0026] The present invention discloses a system and method for reducing the deflection of a lithium battery separator stretching roller. Through a closed-loop control logic of "detection-feedback-correction", the roller can continuously monitor its shape changes during operation and initiate a correction program in real time. By using a ray path that penetrates the inside of the roller and a detection end with micropores, and taking advantage of the principle that the ray path remains unchanged, the system can sensitively capture micron-level ray path deviations in a non-contact manner, thereby controlling the deflection of the roller through a correction device. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 These are schematic diagrams of the main structures disclosed in some embodiments of this application;

[0029] Figure 2 It is attached Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is a side view diagram of some embodiments disclosed in this application;

[0031] Figure 4 It is attached Figure 3 Enlarged view of section B in the middle.

[0032] In the figure: 1-roller body, 101-rotating shaft, 2-correction device, 201-contact element, 202-drive assembly, 301-radiation emitting end, 302-radiation receiving end, 303-feedback unit, 304-micropore, 4-mounting base, 5-diaphragm. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0034] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0035] Since it is difficult to monitor and compensate for the real-time deformation of the roller 1 when the lithium battery separator 5 is stretched, a device is needed that can detect the deflection of the roller 1 at different positions and correct it in real time.

[0036] The following is in conjunction with the appendix Figures 1 to 4 The present application provides a detailed description of a system and method for reducing the deflection of a stretching roller in a lithium battery separator through specific embodiments and application scenarios.

[0037] like Figure 1 As shown, a system for reducing the deflection of a lithium battery separator stretching roller includes two rollers 1, a straightening device 2, and a detection device; at least one of the two rollers 1 is used for actively traction of the separator 5. In this embodiment, a pair of adjacent rollers 1 with a gap between them is used as an example. The rotating shafts 101 at both ends of the two rollers 1 are connected to an external drive device, which is preferably a servo motor and a reducer, not shown in the figure, and is only used to drive the rollers 1 to rotate. It is not an innovation of this application and will not be described in detail here; the drive device drives the two rollers 1 to rotate in opposite directions, and the separator 5 passes through the gap between them. The separator 5 undergoes plastic deformation through high-intensity pressure and frictional shear force, thereby completing the stretching of the separator 5.

[0038] Preferably, the roller body 1 is a large hollow roller, which facilitates the installation of detection devices on its inner side. The roller body 1 is provided with reinforcing ribs to enhance rigidity. The drive devices connected to the rotating shaft 101 at both ends of the roller body 1 are supported by the mounting base 4 to ensure that they can rotate smoothly. The mounting base 4 is used to support the roller body 1 and is not an improvement of this application, so it will not be described in detail here.

[0039] The correction device 2 is installed on the two rollers 1. Due to the static deflection of the rollers 1 themselves and the dynamic deflection generated under the action of thermal and mechanical coupling, the correction device 2 is used to adjust the deflection of the rollers 1 in real time so that the produced diaphragm 5 meets the standard.

[0040] The detection device is used for detecting the eccentricity of the roller body 1 in real time and feeding back the detection result to the correction device 2, so that the correction device 2 adjusts the eccentricity of the roller body 1; the detection device comprises a ray emitting end 301, a ray receiving end 302 and a plurality of detection ends; the eccentricity of the roller body 1 is detected and verified through the principle that the ray propagates along a straight line; the plurality of detection ends are arranged in the roller body 1 along the axis of the roller body 1, the eccentricity of each point of the roller body 1 is detected through the plurality of detection ends arranged at multiple points; the ray emitting end 301 and the ray receiving end 302 are arranged at two ends of the roller body 1 respectively;

[0041] Specifically, the ray emitting end 301 is fixedly installed on a non-rotating base at one end of the roller body 1, preferably, the ray emitting end 301 is fixed on a support outside the mounting seat 4; the ray emitting end 301 is preferably a high collimation laser emitter, the laser beam emitted thereby has a very small divergence angle, energy concentration and good directivity; in other embodiments, an X-ray source or the like can also be used; it should be noted that the ray emitting end 301 and the ray receiving end 302 are respectively used for providing and receiving rays, and are only used for calibrating the roller body 1, the structure thereof is prior art and is not the improvement point of the present application, and will not be described here;

[0042] Specifically, the rays emitted by the ray emitting end 301 pass through the plurality of detection ends in sequence along a preset path and reach the ray receiving end 302; the detection ends arranged in the roller body 1 feed back the offset amount of the rays when the rays are transmitted to different detection ends, and transmit signals to the correction device 2, so that the correction device 2 adjusts the eccentricity of the roller body 1 until the rays reach the ray receiving end 302 along the preset path.

[0043] As shown in Figure 2 in an embodiment, the detection ends detect the eccentricity changes of multiple points of the roller body 1, and the correction device 2 needs to correct the eccentricity of the multiple points of the roller body 1 more specifically;

[0044] The correction device 2 comprises a plurality of correctors, the plurality of correctors are arranged on the roller body 1 along the axis of the roller body 1 and are correspondingly arranged with the detection ends of the multiple points, and the correctors are correspondingly electrically connected with the detection ends; the detection ends detect the ray offset amount, transmit signals to the corresponding correctors through electrical connection, and the correctors adjust the roller body 1 until the rays can normally pass through the corresponding detection ends.

[0045] As shown in Figure 3 in an embodiment, the detection ends need to accurately feed back the eccentricity of the roller body 1 and reflect the eccentricity changes of the roller body 1 at the contact position with the diaphragm 5;

[0046] The detection end is arranged around the axis of the roller body 1 and is located inside the roller body 1 near its side wall. The deflection change of the roller body 1 at the detection end can be directly converted into the displacement change of the detection end. By determining the displacement change of the detection end, the offset of the ray can be reflected.

[0047] The position of the corrector is consistent with the position of the detection end. The point of action of each corrector corresponds to the position of the corresponding detection end on the axial direction of the roller body 1, so that the corrector can perform correction at the corresponding position after the offset of the ray is fed back by the detection end.

[0048] like Figure 4 As shown, in one embodiment, when the roller 1 has deflection, the deflection of the roller 1 needs to be reflected more intuitively by the offset of the detection end, and the offset is transmitted to the corrector through the detection end.

[0049] The detection ends are distributed and built into the cavity of the roller body 1 at a certain interval along the axial direction of the roller body 1, and are evenly arranged around the circumference of the roller body 1; preferably, the detection ends are set at a position close to the inner sidewall of the roller body 1, so as to more sensitively detect the deformation of the roller body 1 shell;

[0050] The detection end includes a micro-hole 304 and a feedback unit 303. The feedback unit 303 is located on both sides of the micro-hole 304 and is arranged radially along the roller body 1. When the deflection of the roller body 1 meets the standard, the rays emitted by the ray emitting end 301 can pass through the micro-holes 304 of the detection end at each point in sequence and reach the ray receiving end 302, so that the roller body 1 can meet the standard when processing the diaphragm 5. When the deflection of the roller body 1 is large, the rays emitted by the ray emitting end 301 are received by the feedback unit 303. The feedback unit 303 identifies and determines the ray offset and feeds back its signal to the corrector through an electrical connection.

[0051] like Figure 2 As shown, in one embodiment, the straightener needs to be able to perform correction at different positions of the roller 1, and it is necessary to prevent the roller 1 from detaching from the straightener;

[0052] The straightener includes a drive assembly 202 and a contact 201. The drive assembly 202 is connected to the contact 201 and can drive the contact 201 to move in the radial direction of the roller body 1 to change the deflection of the roller body 1 at that location. The contact 201 is fitted to the outer wall of the roller body 1 and moves under the drive of the drive assembly 202, thereby driving the roller body 1 connected to it.

[0053] Specifically, the contact element 201 needs to have a tighter contact with the roller body 1 without interfering with the normal rotation of the roller body 1. The contact element 201 is preferably a clamp, which is located on the side of the roller body 1 away from the diaphragm 5.

[0054] Specifically, the inner wall of the hoop is embedded with wear-resistant material with low friction coefficient, preferably polytetrafluoroethylene or graphite copper sleeve, so that the inner wall of the hoop is in sliding connection with the outer wall of the roller body 1, which can exert force in the radial direction without hindering the normal rotation of the roller body 1.

[0055] Specifically, the driving assembly 202 includes a telescopic rod connected with the hoop, which drives the hoop to push or stretch along the radial direction of the roller body 1 to adjust the degree of distortion of the roller body 1.

[0056] Specifically, the telescopic rod is preferably a high-precision electric servo push rod, which can provide a larger traction force and the telescopic length is controllable; the corrector further includes a control unit arranged on the telescopic rod, which can adopt PLC (Programmable Logic Controller) or industrial computer. The control unit is electrically connected with all feedback parts 303 of the detection ends and all correctors through signal lines or wireless mode, for receiving signals and controlling the work of the servo push rod;

[0057] Specifically, after the feedback part 303 receives the ray, it transmits the ray offset signal to the control unit, which sends a driving instruction to the hydraulic telescopic rod of the corrector according to the offset signal, to push or stretch along the radial direction of the roller body 1 to control the movement of the hoop, and then adjust the degree of distortion of the roller body 1, until the ray emitted by the ray emitting end 301 is received by the ray receiving end 302 in turn through the micro hole 304.

[0058] Specifically, the feedback part 303 preferably adopts high-sensitivity area array photoelectric sensors, which are symmetrically arranged on both sides of the micro hole 304 along the circumferential direction of the roller body 1. When the roller body 1 has no distortion, the ray precisely passes through the micro hole 304, and the feedback part 303 has no signal; when the roller body 1 is distorted or bent, the ray beam deviates from the micro hole 304 and irradiates on one of the feedback parts 303, which transmits the signal to the corrector for calibration.

[0059] The application also discloses a method for reducing the distortion degree of a lithium battery separator stretching roller, which is applied to the system for reducing the distortion degree of a lithium battery separator stretching roller and includes the following steps:

[0060] S1, start the production line, and drive the roller body 1 to rotate. At the same time, start the ray emitting end 301 to emit a high collimation degree laser beam. The laser beam is transmitted along a preset path coinciding with the theoretical axis of the roller body 1 towards the ray receiving end 302. During the rotation of the roller body 1, the laser beam will periodically scan through the detection ends arranged around the axis;

[0061] S2: The ray receiving end 302 monitors in real time. If the ray receiving end 302 can stably and continuously receive the laser signal passing through all the detection end micro-holes 304, it is determined that the dynamic disturbance of the roller body 1 in the current state meets the production process standard, the system maintains the current state, and the diaphragm 5 stretching operation continues to be performed;

[0062] S3: If the laser beam at any detection end does not pass through the micro-hole 304 due to the deformation of the roller body 1 during the rotation of the roller body 1, and is received by the feedback part 303 on one side of the micro-hole 304, the feedback part 303 will immediately act and accurately detect the offset amount of the ray, and the offset amount signal will be fed back to the control unit in real time through electrical connection;

[0063] S4: The control unit calculates and generates a driving instruction according to the received offset amount signal; the instruction is sent to the corrector corresponding to the position of the detection end that sends the signal. The driving assembly 202 (servo push rod) of the corrector drives the contact 201 (hoop) to move along the radial direction of the roller body 1, and applies an accurate pushing force or pulling force to the specific position of the roller body 1;

[0064] S5: After performing a correction action, the process automatically returns to step S1 and continues to detect; through such closed-loop control, the system repeatedly performs steps S1 to S4 until the ray can stably pass through all the micro-holes 304 of the detection end again, at which time it is marked that the disturbance at this position has been successfully corrected. The system enters a stable monitoring state and starts the correction cycle again when a deviation is detected next time.

[0065] It should be noted that in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles, or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element.

[0066] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0067] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A system for reducing the deflection of a stretching roller in a lithium battery separator, characterized in that, include: Two rollers, with a gap between them, for the diaphragm to pass through and be stretched; The two rollers are disposed on a drive device, which drives the pair of rollers to rotate. A correction device is provided on the roller body for adjusting the roller body deflection; The detection device includes a radiation emitting end, a radiation receiving end, and a plurality of detection ends; the plurality of detection ends are distributed and disposed within the roller body along the axis of the roller body; the radiation emitting end and the radiation receiving end are respectively disposed at both ends of the roller body; the detection ends are disposed around the axis of the roller body and are located within the roller body near its sidewall; The radiation emitted by the radiation emitting end passes through several of the detection ends in sequence along a preset path and arrives at the radiation receiving end; the detection end feeds back the radiation offset to the correction device.

2. The system for reducing the deflection of a lithium battery separator stretching roller according to claim 1, characterized in that, The correction device includes a plurality of correctors; the plurality of correctors are distributed on the roller body along the axis of the roller body; the correctors are electrically connected to the detection end.

3. The system for reducing the deflection of a lithium battery separator stretching roller according to claim 2, characterized in that, The position of the corrector is consistent with the position of the detection end, and the point of action of each corrector corresponds to the position of the corresponding detection end on the axial direction of the roller.

4. The system for reducing the deflection of a lithium battery separator stretching roller according to claim 3, characterized in that, The detection end includes a micro-hole and a feedback section; the feedback section is located on both sides of the micro-hole and is arranged radially along the roller body. When the radiation emitted by the radiation emitting end is received by the feedback unit, the radiation offset signal is fed back to the corrector through an electrical connection.

5. The system for reducing the deflection of a lithium battery separator stretching roller according to claim 4, characterized in that, The corrector includes a drive assembly and a contact element; the drive assembly drives the contact element to move radially along the roller body; the contact element is fitted against the outer wall of the roller body.

6. The system for reducing the deflection of a lithium battery separator stretching roller according to claim 5, characterized in that, The corrector also includes a control unit. The feedback unit transmits the ray offset signal to the control unit. The control unit sends a drive command to the drive component of the corrector according to the offset signal, pushing or stretching the roller radially to adjust the roller deflection until the rays emitted by the ray emitting end pass through the micro-holes and are received by the ray receiving end.

7. The system for reducing the deflection of a lithium battery separator stretching roller according to claim 6, characterized in that, The contact element includes a clamp, which is located on the side of the roller body away from the diaphragm and is slidably connected to the roller body.

8. The system for reducing the deflection of a lithium battery separator stretching roller according to claim 7, characterized in that, The drive assembly includes a telescopic rod connected to a clamp, which drives the clamp to push or stretch radially along the roller body to adjust the roller body deflection.

9. A method for reducing the deflection of a lithium battery separator stretching roller, based on the system for reducing the deflection of a lithium battery separator stretching roller according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Activate the ray emitting end, so that the emitted ray is transmitted towards the ray receiving end along a preset path; S2: If the X-ray receiving end receives X-rays that pass through each of the detection ends in sequence, it is determined that the roller body deflection meets the standard and the diaphragm stretching can be performed. S3: If the radiation is received by the detection end, the detection end detects and feeds back the radiation offset to the corresponding correction device; S4: The correction device pushes or stretches the roller body radially according to the ray offset, repeating steps S1-S3 until the ray can pass through each of the detection ends.

10. A method for reducing the deflection of a lithium battery separator stretching roller according to claim 9, characterized in that, In step S1, when the roller rotates under the drive of the driving device, the rays emitted by the ray emitting end pass through the detection end arranged around the axis of the roller in sequence.

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