Tab shielding method and system in lithium battery material rectification process

Abstract

The present application relates to a kind of lithium battery material deviation correction process tab shielding method and system, specific method as follows: sensor is calibrated;According to the maximum and minimum of sensor detection value, obtain tab filter value FL and the value of tab amplitude threshold St;Lithium battery material is sampled using sensor, and the lateral displacement Sa of two adjacent sampling periods of sampling point A and sampling point B and Sb are obtained;Deviation correction controller receives lateral displacement Sa and Sb, and stores in FIFO buffer;Then by data analysis processing to Sa, Sb, FL and St, determine whether sampling point is in tab area;If sampling point is in tab area, deviation correction controller controls actuator to keep locking;If sampling point is not in tab area, deviation correction controller controls actuator to act.The present application can shield tab when sensor detects tab, do not carry out deviation correction action, ensure that tab passes through sensor normally when passing through sensor, deviation correction mechanism does not shake, improve deviation correction precision.

Description

Technical Field

[0001] This invention relates to the field of lithium battery materials technology, and in particular to a method and system for shielding the tabs during the correction process of lithium battery materials. Background Technology

[0002] Typically, web guiding systems require that the input web offset be a steady-state offset, meaning that the lateral displacement of the material is a steady-state, gradual process. For example... Figure 5 The lateral offset Sx at the edge of the rolled material is a steady-state offset around a certain center. In this case, by properly configuring the correction parameters, a very high correction accuracy can be achieved. However, in the production process of lithium battery materials, due to the special nature of the lithium battery material's manufacturing process, its edges... Figure 6 As shown.

[0003] When the material encounters a protruding tab during its journey, it causes a large abrupt change in lateral offset Sx. The lateral velocity of this instantaneous positional offset is infinite. The corrector will correct this instantaneous positional offset Sx at its maximum driving speed. The end result is that whenever the material encounters a tab or a gap, it will cause the corrector to oscillate during correction, resulting in the material not being aligned. In severe cases, it may damage the material and cause the entire roll of material to be scrapped.

[0004] During use, the correction device does not oscillate every time it encounters a tab. This is because each correction device has a sampling period. When the sampling time falls on the tab or notch, it will cause the correction device to oscillate. When the sampling time falls on the normal material edge, the correction device will correct the deviation normally. When the correction system encounters such materials, it cannot guarantee the correction accuracy.

[0005] Currently, common solutions involve adding two sensors for dual-point detection, or using a single custom-designed sensor (with two internal detection points) to detect the edges of normal materials and tabs. When a tab is encountered, the correction device locks in place; otherwise, it corrects the alignment normally. While this solution addresses the tab shielding issue, it increases costs for manufacturers. Furthermore, custom-designed sensors lack versatility; different applications require various specifications, such as V-holes and Mark holes, each with different dual-point detection installation methods, hindering later equipment maintenance and management. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for shielding the tabs during the correction process of lithium battery materials. The method sets two parameters: an adjustable tab filter value FL and a tab amplitude threshold St. The correction controller analyzes and processes the lateral displacements Sa, Sb, FL, and St collected by the sensor at adjacent sampling time points. When the sensor detects the tab, the tab is shielded and no correction action is performed, so as to ensure that the correction mechanism does not vibrate when the tab passes through the sensor, thereby improving the correction accuracy.

[0007] Firstly, to solve the above-mentioned technical problems, the present invention provides a method for shielding the tabs during the polarization correction process of lithium battery materials, the specific method of which is as follows: S1. Calibrate the sensor; S2. Obtain the maximum and minimum values ​​detected by the sensor, and calculate the values ​​of the tab filter value FL and the tab amplitude threshold value St based on the obtained maximum and minimum values; where, FL = (Maximum value - Minimum value) Kfl, where Kfl is a percentage coefficient; St = (Maximum value - Minimum value) Kst, where Kst is the percentage coefficient; S3. Use sensors to periodically sample the edge of the lithium battery material during its movement, obtain the lateral displacement of sampling point A and sampling point B in two adjacent sampling periods, and record the lateral displacement at sampling point A as Sa and the lateral displacement at sampling point B as Sb. S4. The correction controller receives the lateral displacement Sa at sampling point A and the lateral displacement Sb at sampling point B collected by the sensor, and stores Sa and Sb into the FIFO buffer. S5, the correction controller analyzes and processes the data of Sa, Sb, FL and St to determine whether the sampling point is in the tab region; If the sampling point is in the tab area, the correction controller controls the actuator to remain locked, and the correction mechanism does not correct the lithium battery material. If the sampling point is not located in the tab area, the correction controller controls the actuator to act, and the correction mechanism corrects the lithium battery material according to the actual deviation of the lithium battery material.

[0008] In one embodiment of the present invention, the value range of KFL in the tab filter value FL in step S1 is 5%-20%, and the value range of KSt in the tab amplitude threshold value St is 40%-70%.

[0009] In one embodiment of the present invention, in step S5, the method by which the correction controller determines whether the sampling point encounters a tab by analyzing Sa, Sb, FL, and St is as follows: S51. Calculate the lateral displacement difference ΔSab=|Sb-Sa|; S52. If ΔSab>St, it is determined that a sudden change in the lateral displacement of the lithium battery material occurs, and at this time one of sampling point A and sampling point B is located in the tab region; S53. If ΔSab<=St, it is determined that neither sampling point A nor sampling point B is located in the tab region.

[0010] In one embodiment of the present invention, in step S53, if the sampling points are not located in the tab region, it is necessary to determine whether the sampling points are located in the arc transition regions on both sides of the tab, and the specific method is as follows: Perform multiple samplings through the sensor, sequentially store the data into the FIFO buffer, then perform digital filtering processing on the sampled data to obtain the weighted average value △S of the offset data; If ΔS>=FL, it indicates that one of sampling point A and sampling point B of the lithium battery material is located in the arc transition region, and at this time the deviation correction controller controls the actuator to keep locked, and waits for the sensor to perform sampling detection again after the arc transition region moves out; If ΔS<FL, it indicates that no sampling point is located in the arc transition region, the deviation correction controller controls the actuator to act, and the deviation correction mechanism realizes normal deviation correction for the lithium battery material according to the actual deviation magnitude of the lithium battery material.

[0011] In one embodiment of the present invention, the specific method for performing digital filtering processing on the multiple sets of sampled data from the sensor is as follows: Sort the sampled data in ascending order, and store the sorted data into the FIFO buffer; Remove the 2 minimum values and 2 maximum values from the sorted data, then perform weighted averaging on the remaining data to obtain the final offset data △S.

[0012] In one embodiment of the present invention, when ΔSab<=St, the number of samplings performed by the sensor is at least 10.

[0013] In a second aspect, to solve the above technical problems, the present invention provides a lithium battery material deviation correction control system, which executes the tab shielding method in the lithium battery material deviation correction process according to the first aspect, comprising a deviation correction controller, a sensor, and an actuator, wherein the sensor is configured to detect the current position of the lithium battery material and feed position information back to the deviation correction controller, and the deviation correction controller drives the actuator to correct the position of the lithium battery material according to the position deviation magnitude of the lithium battery material.

[0014] In one embodiment of the present invention, the actuator is a servo driver, and the servo driver controls the deviation correction mechanism to complete the deviation correction action according to the control instruction sent by the deviation correction controller.

[0015] In one embodiment of the present invention, the scanning frequency of the sensor to obtain the lateral position offset of the lithium battery material is 200HZ-1000HZ.

[0016] In one embodiment of the present invention, the sampling period of the sensor is 1ms-5ms.

[0017] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: The present invention discloses a method for shielding the tabs during the correction process of lithium battery materials. This method is highly versatile, low-cost, and highly reliable, and is applicable to existing sensors. It sets two parameters: an adjustable tab filter value FL and a tab amplitude threshold St. The lateral displacements Sa and Sb at adjacent sampling time points are collected by the sensor. The correction controller analyzes and processes Sa, Sb, FL, and St. When a tab is detected, the lithium battery material tab is shielded, ensuring that the lithium battery material operates normally when the tab passes through the sensor. The correction mechanism does not vibrate, improving the correction accuracy and solving the problem of uneven correction or oscillation caused by the tab. Attached Figure Description

[0018] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a flowchart illustrating the electrode shielding method during the lithium battery material correction process in a preferred embodiment of the present invention. Figure 2 This is a schematic diagram of sampling point B located in the tab region in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of sampling point A located in the tab region in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the arc transition region where sampling point B is located on one side of the electrode in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram showing the movement of lithium battery materials without tabs at the edges; Figure 6 This is a schematic diagram showing the movement of lithium battery materials with tabs on their edges; Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0020] Example 1 Reference Figure 1 As shown, the present invention provides a method for shielding the tabs during the polarization correction process of lithium battery materials. The specific method is as follows: S1. Calibrate the sensor; S2. Obtain the maximum and minimum values ​​detected by the sensor, and calculate the values ​​of the tab filter value FL and the tab amplitude threshold value St based on the obtained maximum and minimum values; where, FL = (Maximum value - Minimum value) Kfl, where Kfl is a percentage coefficient; St = (Maximum value - Minimum value) Kst, where Kst is the percentage coefficient; S3. Use sensors to periodically sample the edge of the lithium battery material during its movement, and obtain the lateral displacement of sampling point A and sampling point B in two adjacent sampling periods. Record the lateral displacement at sampling point A as Sa and the lateral displacement at sampling point B as Sb. S4. The correction controller receives the lateral displacement Sa at sampling point A and the lateral displacement Sb at sampling point B collected by the sensor, and stores Sa and Sb into the FIFO buffer. S5, the correction controller analyzes and processes the data of Sa, Sb, FL and St to determine whether the sampling point is in the tab region; If the sampling point is in the tab area, the correction controller controls the actuator to remain locked, and the correction mechanism does not correct the lithium battery material. If the sampling point is not located in the tab area, the correction controller controls the actuator to act, and the correction mechanism corrects the lithium battery material according to the actual deviation of the lithium battery material.

[0021] In this embodiment, the value range of KFL in the tab filter value FL in step S1 is 5%, and the value range of KSt in the tab amplitude threshold value St is 50%. In actual applications, customers will modify the values ​​according to their own lithium battery materials.

[0022] Since both the maximum and minimum values ​​are the sensor's detected values, the effective detection range of the sensor can be obtained by subtracting the minimum value from the maximum value. For example, if the threshold St coefficient Kst is 50% and the threshold St coefficient Kst is 16 mm, then St = 8 mm; if the KFL coefficient in FL is 5%, then FL = 0.8 mm.

[0023] Specifically, in step S5, the method by which the correction controller determines whether a sampling point encounters a tab by analyzing Sa, Sb, FL, and St is as follows: S51. Calculate the lateral displacement difference ΔSab = |Sb - Sa|; S52. If ΔSab>St, then determine the sudden change in the lateral displacement of the lithium battery material. At this time, one of the sampling points A and B is located in the tab region. S53. If ΔSab<=St, it is determined that neither sampling point A nor sampling point B is located in the tab region.

[0024] Wherein, in step S53, if the sampling points are not located in the tab region, it is necessary to determine whether the sampling points are located in the arc transition regions on both sides of the tab, and the specific method is as follows: Perform multiple samplings through the sensor, store the data in the FIFO buffer in sequence, and then perform digital filtering processing on the sampled data to obtain the weighted average value ΔS of the offset data; If ΔS>=FL, it indicates that one of sampling point A and sampling point B of the lithium battery material is located in the arc transition region. At this time, the deviation correction controller controls the actuator to remain locked, and waits for the sensor to perform sampling detection after the arc transition region moves out; since the sensor performs periodic sampling, the deviation correction controller continuously detects and calculates the difference with the previously stored sampling value. If the difference is less than FL, it is considered that the arc transition region has moved out; If ΔS<FL, it indicates that no sampling point is located in the arc transition region, the deviation correction controller controls the actuator to act, and the deviation correction mechanism realizes normal deviation correction for the lithium battery material according to the actual deviation magnitude of the lithium battery material.

[0025] In this embodiment, the main purpose of determining whether the sampling points are located in the arc transition region is to filter out the arcs, so as to avoid the actuator jitter caused by performing deviation correction on the material when encountering an arc, which leads to transient errors of the material and affects subsequent processes. This method also avoids the limitation of special sensors that cannot filter arcs due to structural constraints. Special sensors generally use two or more detection points arranged side by side to detect tabs, and there will be detection blind areas between two adjacent detection points, making it impossible to filter relatively small arcs.

[0026] In this embodiment, the specific method for performing digital filtering processing on the multiple sets of sampled data from the sensor is as follows: Sort the sampled data in ascending order, and store the sorted data in the FIFO buffer; Remove 2 minimum values and 2 maximum values from the sorted data, then perform weighted averaging on the remaining data to obtain the final offset data ΔS.

[0027] Preferably, when ΔSab<=St, the number of sampling times performed by the sensor is 10.

[0028] In this embodiment, when the sensor performs 10 samplings, it acquires sampling data X1, X2, ... X10. X1, X2, ... X10 are hashed and sorted. The sorted data are then defined as Y1, Y2, ... Y10 in ascending order and placed into a FIFO buffer. A digital filtering algorithm for the FIFO data channel is used to remove the two minimum values ​​Y1 and Y2 and the two maximum values ​​Y9 and Y10 from the sorted data. Then, a weighted average is performed on the six data points Y3, Y4, ... Y7, Y8 to obtain the final offset data ΔS.

[0029] Based on the electrode shielding method in the lithium battery material correction process of this embodiment, two parameters can be set without changing the hardware of the correction mechanism: an adjustable electrode filter value FL and an electrode amplitude threshold St. The correction controller analyzes the offset data of adjacent sampling time points collected by the sensor to determine whether the electrode is detected. When the electrode is detected, the electrode of the lithium battery material is shielded to ensure that the lithium battery material runs normally when the electrode passes through the sensor. The correction mechanism will not vibrate, which effectively improves the correction accuracy. It has strong applicability, low cost, high reliability, and is applicable to existing sensors.

[0030] This embodiment only analyzes the protruding tabs. In actual applications, lithium battery materials will encounter not only protruding tabs but also edge gaps during their movement. The tab shielding method described in this embodiment during the lithium battery material correction process is also applicable to shielding edge gaps.

[0031] Example 2 This invention provides a lithium battery material correction control system, which executes the tab shielding method during the lithium battery material correction process as described in Embodiment 1. The system includes a correction controller, a sensor, and an actuator. The sensor is used to detect the current position of the lithium battery material and feed the position information back to the correction controller. The correction controller drives the actuator to correct the position of the lithium battery material according to the magnitude of the position deviation of the lithium battery material.

[0032] In this embodiment, the deviation of the lithium battery material refers to the deviation between the current position of the lithium battery material and the zero-point position of the sensor. The ultimate goal of the correction is to correct the lithium battery material to the zero-point position of the sensor (the zero-point position of the sensor is fixed and pre-set), which is equivalent to the reference position of the lithium battery material.

[0033] Preferably, the actuator is a servo driver, which controls the correction mechanism to complete the correction action according to the control command sent by the correction controller.

[0034] Preferably, the scanning frequency of the sensor to obtain the lateral positional offset of the lithium battery material is 200 Hz.

[0035] In this embodiment, the sampling period of the sensor is 1ms.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for shielding the tabs during the polarization correction process of lithium battery materials, characterized in that: The specific method is as follows: S1. Calibrate the sensor; S2. Acquire the maximum value and the minimum value of the detection value of the sensor, and calculate the value of the tab filter value FL and the tab amplitude threshold St according to the acquired maximum value and minimum value; wherein, FL = (Maximum value - Minimum value) Kfl, where Kfl is a percentage coefficient; St = (Maximum value - Minimum value) Kst, where Kst is the percentage coefficient; S3. Perform periodic data sampling on the edge of the lithium battery material in the traveling process by using the sensor, acquire the lateral displacements of sampling point A and sampling point B in two adjacent sampling periods, and record the lateral displacement at sampling point A as Sa and the lateral displacement at sampling point B as Sb; S4. The deviation correction controller receives the lateral displacement Sa at sampling point A and the lateral displacement Sb at sampling point B collected by the sensor, and stores Sa and Sb into the FIFO buffer; S5. The deviation correction controller performs data analysis and processing on Sa, Sb, FL and St to determine whether the sampling points are in the tab region; If the sampling points are in the tab region, the deviation correction controller controls the actuator to keep locked, and the deviation correction mechanism does not perform deviation correction on the lithium battery material; If the sampling points are not in the tab region, the deviation correction controller controls the actuator to act, and the deviation correction mechanism performs a deviation correction action on the lithium battery material according to the actual deviation magnitude of the lithium battery material.

2. The electrode shielding method during the polarization correction process of lithium battery materials according to claim 1, characterized in that: The value range of KFL in the tab filter value FL described in step S1 is 5%-20%, and the value range of KSt in the tab amplitude threshold St is 40%-70%.

3. The electrode shielding method during the polarization correction process of lithium battery materials according to claim 1, characterized in that: In step S5, the specific method for the deviation correction controller to determine whether the sampling points encounter a tab by analyzing and processing Sa, Sb, FL and St is as follows: S51. Calculate the lateral displacement difference ΔSab=|Sb-Sa|; S52. If ΔSab>St, it is determined that the lateral displacement of the lithium battery material has a sudden change, and at this time, one of sampling point A and sampling point B is in the tab region; S53. If ΔSab<=St, it is determined that neither sampling point A nor sampling point B is in the tab region.

4. The electrode shielding method during the polarization correction process of lithium battery materials according to claim 3, characterized in that: In step S53, if the sampling points are not in the tab region, it is necessary to determine whether the sampling points are in the arc transition regions on both sides of the tab, and the specific method is as follows: Perform multiple samplings through the sensor, store the data in the FIFO buffer in sequence, and then perform digital filtering processing on the sampled data to obtain the weighted average value ΔS of the offset data; If ΔS>=FL, it indicates that one of sampling point A and sampling point B of the lithium battery material is located in the arc transition region, at this time, the deviation correction controller controls the actuator to keep locked, and waits for the arc transition region to move out before the sensor performs sampling detection again; If ΔS<FL, it indicates that no sampling point is in the arc transition region, the deviation correction controller controls the actuator to act, and the deviation correction mechanism realizes normal deviation correction on the lithium battery material according to the actual deviation magnitude of the lithium battery material.

5. The electrode shielding method during the polarization correction process of lithium battery materials according to claim 4, characterized in that: The specific method for performing digital filtering processing on the multiple sampled data of the sensor is as follows: Sort the sampled data from small to large, and store the sorted data into the FIFO buffer; Remove 2 minimum values and 2 maximum values from the sorted data, then perform weighted averaging on the remaining data to obtain the final offset data ΔS.

6. The electrode shielding method during the polarization correction process of lithium battery materials according to claim 5, characterized in that: When ΔSab<=St, the number of samplings performed by the sensor is at least 10 times.

7. A lithium battery material correction control system, which executes the electrode shielding method during the lithium battery material correction process as described in any one of claims 1-6, characterized in that: It includes a correction controller, a sensor, and an actuator. The sensor is used to detect the current position of the lithium battery material and feed the position information back to the correction controller. The correction controller drives the actuator to correct the position of the lithium battery material according to the magnitude of the position deviation of the lithium battery material.

8. A lithium battery material correction control system according to claim 7, characterized in that: The actuator is a servo driver, which controls the correction mechanism to complete the correction action according to the control command sent by the correction controller.

9. A lithium battery material correction control system according to claim 7, characterized in that: The scanning frequency of the sensor to obtain the lateral positional offset of the lithium battery material is 200HZ-1000HZ.

10. A lithium battery material correction control system according to claim 7, characterized in that: The sampling period of the sensor is 1ms-5ms.

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