A core winding system and correction method

Abstract

The application belongs to the technical field of batteries, and particularly relates to a winding core winding system and a correction method. The winding core winding system comprises a winding module, a die-cutting module, an embossing module and a correction module. The winding module comprises a winding needle, and the winding needle is used for winding a pole piece and a diaphragm to form a winding core. The die-cuting module comprises a laser die-cutting unit, and is used for die-cutting a tab on the edge of the pole piece. The embossing module comprises an embossing roller unit, and is used for constructing an embossed area on the pole piece. The correction module comprises a detection unit and a control unit. The detection unit is used for collecting a first time and a second time when two opposite side edges of the tab respectively pass through a certain point during the winding process. The control unit calculates an error of the winding core and a misalignment amount of the tab according to the data collected by the detection unit, a timing zero point, an angular velocity of the winding needle, a distance from the winding needle to the certain point and an entry position of the pole piece. Whether to correct the pole piece to be wound is determined based on the error of the winding core, and the laser die-cutting unit and the embossing roller unit are controlled to work according to the misalignment amount of the tab.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of batteries, and particularly relates to a winding system for a winding core and a correction method. BACKGROUND

[0002] With the development of lithium battery technology, the capacity requirement for single battery cells is getting higher and higher. High-capacity single battery cells bring an increase in the number of winding core winding layers and the number of tabs, which poses a great challenge to the control of tab misalignment during winding.

[0003] Current tab misalignment correction mostly relies on manual adjustment or automatic adjustment, such as the use of embossing rollers, die cutting variable pitch, or winding needle variable winding diameter alone. The above methods have limited effect on correcting tab misalignment, and automatic adjustment will accumulate errors during use, resulting in poor tab misalignment correction effect and the need for frequent manual intervention for correction.

[0004] Among them, manual correction requires relatively high requirements for operators, who need to have rich operating experience, otherwise a large number of winding cores will be scrapped. Secondly, the manual correction process (tearing and pasting Teflon or manually adjusting the tab spacing) requires the winding equipment to be shut down for operation, thereby affecting the normal work of the production line.

[0005] In addition, some automatic adjustment methods use a CCD (charge coupled device) camera to detect the misalignment of the tabs after cold pressing, and adjust the winding machine parameters accordingly to avoid batch production of defective battery cores. However, in actual application, there are usually 2-3 winding needles on the winding machine turret. When one winding core is unloaded from the winding needle to the CCD camera position, several winding cores have already been stacked. If the tab misalignment of one winding core is relatively serious, the misalignment of the following several winding cores is also likely to be relatively serious. Therefore, the tab misalignment of the winding core cannot be corrected in time, which seriously affects the yield of the winding core production. SUMMARY

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a tab misalignment correction method that can correct the tab misalignment of the next winding core in time and reduce the intervention of manual work. In addition, timely verification of the correction result of the tab misalignment greatly improves the reliability of the correction method.

[0007] To achieve the above object and other related objects, the present application provides a winding core winding system, comprising: a winding module, comprising a winding needle, the winding needle is used for winding the pole piece and the diaphragm to form a winding core; a die cutting module, comprising a laser die cutting unit, used for cutting out the tabs on the edge of the pole piece; an embossing module, comprising an embossing roller unit, used for constructing the embossing area on the pole piece; a correction module, comprising a detection unit and a control unit, the detection unit is used for collecting the first time and the second time when the opposite two side edges of the tab respectively pass through a certain point during the winding process, and outputting the collected data to the control unit; the control unit calculates the edge distance of the tab according to the data collected by the detection unit, and according to the timing zero point, the angular velocity of the winding needle, the distance from the winding needle to the fixed point, and the entry position of the pole piece; and the control unit also calculates the error of the corresponding winding core and the displacement amount of the tab according to the edge distance of all the tabs; the edge distance of the tab is the distance from the tab to the side edge of the winding core after cold pressing; the control unit is also used for judging whether to correct the pole piece to be wound based on the error of the winding core, and controlling the work of the laser die cutting unit and the embossing roller unit according to the displacement amount of the tab.

[0008] According to a specific embodiment of the present application, it further comprises a cold pressing module for pressing the winding core into a preset shape.

[0009] According to a specific embodiment of the present application, the correction module further comprises a verification unit for collecting the actual error of the winding core after cold pressing and the actual edge distance of the innermost tab, and outputting the collected data to the control unit.

[0010] According to a specific embodiment of the present application, the control unit is also used for optimizing its own calculation program and the working parameters of the detection unit according to the data collected by the verification unit and the error of the winding core and the edge distance of the innermost tab.

[0011] According to a specific embodiment of the present application, the detection unit comprises a positive electrode detection subunit and a negative electrode detection subunit, respectively used for collecting the first time and the second time when the positive tab and the negative tab pass through the corresponding fixed point; the laser die cutting unit comprises a positive electrode laser die cutting subunit and a negative electrode laser die cutting subunit, respectively used for cutting out the positive tab on the positive pole piece and the negative tab on the negative pole piece; the embossing roller unit comprises a positive electrode embossing subunit and a negative electrode embossing subunit, respectively used for constructing the embossing area on the positive pole piece and the negative pole piece.

[0012] According to a specific embodiment of the present application, the control unit calculates the positive error of the corresponding winding core and the misalignment amount of the positive lug according to the data collected by the positive detection subunit, the timing zero point, the angular velocity of the winding needle, the distance from the winding needle to the corresponding fixed point, and the entry position of the positive sheet; the control unit also calculates the negative error of the corresponding winding core and the misalignment amount of the negative lug according to the data collected by the negative detection subunit, the timing zero point, the angular velocity of the winding needle, the distance from the winding needle to the corresponding fixed point, and the entry position of the negative sheet; wherein the error of the winding core includes the positive error and the negative error, and the misalignment amount of the lug includes the misalignment amount of the positive lug and the misalignment amount of the negative lug.

[0013] According to a specific embodiment of the present application, the control unit judges whether to correct the positive sheet to be wound based on the positive error of the winding core, and counts the number of positive lugs that need to be corrected according to the misalignment amount of the positive lug, and controls the operation of the positive laser die-cutting subunit and the positive embossing subunit accordingly; the control unit also judges whether to correct the negative sheet to be wound based on the negative error of the winding core, and counts the number of negative lugs that need to be corrected according to the misalignment amount of the negative lug, and controls the operation of the negative laser die-cutting subunit and the negative embossing subunit accordingly.

[0014] A correction method of a winding core winding system, comprising: in the process of winding the sheet, collecting the first time and the second time when the two sides of each lug pass through a certain point by a detection unit, and calculating the position of each lug on the winding core according to the timing zero point and the entry position of the corresponding sheet; preprocessing the positions of all lugs to obtain the edge distance of each lug; comparing the edge distance of the innermost lug of the winding core with the edge distance of each remaining lug to obtain the misalignment amount corresponding to each remaining lug, and taking the maximum value of all misalignment amounts as the error of the winding core; judging whether the sheet to be wound needs to be corrected according to the error of the winding core and the error tolerance value of the standard winding core.

[0015] According to a specific embodiment of the present application, the step of collecting, by the detection unit, the first time and the second time when the two side edges of each tab pass through a certain point during the winding of the pole piece, and calculating the position of each tab on the winding core according to the timing zero point and the entry position of the corresponding pole piece, comprises: collecting the first time when one side edge of the positive tab passes through the corresponding fixed point, and the first time when one side edge of the negative tab passes through the corresponding fixed point; calculating the phase angle of the winding needle turned between the timing zero point and the first time according to the angular velocity of the winding needle, and converting it into the winding arc length of the pole piece, to obtain the winding arc length of the positive pole piece and the winding arc length of the negative pole piece respectively; collecting the second time when the other side edge of the positive tab passes through the corresponding fixed point, and the second time when the other side edge of the negative tab passes through the corresponding fixed point, and taking the corresponding second time as the new timing zero point respectively; calculating the phase angle of the winding needle turned between the first time and the second time according to the angular velocity of the winding needle, and converting it into the arc length of the tab, to obtain the arc length of the positive tab and the arc length of the negative tab respectively; calculating the position of the positive tab according to the distance from the corresponding fixed point to the winding needle, the entry position of the positive pole piece, or the position of the last positive tab, and the winding arc length of the positive pole piece and the arc length of the positive tab; and calculating the position of the negative tab according to the distance from the corresponding fixed point to the winding needle, the entry position of the negative pole piece, or the position of the last negative tab, and the winding arc length of the negative pole piece and the arc length of the negative tab; the position of the tab comprises the position of the positive tab and the position of the negative tab.

[0016] According to a specific embodiment of the present application, the step of preprocessing the positions of all the tabs to obtain the edge distance of each tab comprises: calculating the edge distance of the positive tab and the edge distance of the negative tab according to the position of the tab and the compensation parameter of the winding core after cold pressing respectively; the edge distance of the tab comprises the edge distance of the positive tab and the edge distance of the negative tab.

[0017] According to a specific embodiment of the present application, the step of comparing the edge distance of the innermost tab of the winding core with the edge distance of each of the remaining tabs to obtain the corresponding displacement amount of each of the remaining tabs, and taking the maximum value among all the displacement amounts as the error of the winding core, comprises: taking the difference between the edge distance of each of the remaining positive tabs and the edge distance of the innermost positive tab as the displacement amount of the corresponding positive tab, and taking the maximum value among all the displacement amounts of the positive tab as the positive error of the winding core; taking the difference between the edge distance of each of the remaining negative tabs and the edge distance of the innermost negative tab as the displacement amount of the corresponding negative tab, and taking the maximum value among all the displacement amounts of the negative tab as the negative error of the winding core; wherein the error of the winding core comprises the positive error and the negative error, and the displacement amount of the tab comprises the displacement amount of the positive tab and the displacement amount of the negative tab.

[0018] According to an embodiment of the present application, before determining whether the to-be-wound pole piece needs to be corrected according to the error of the winding core and the error tolerance of the standard winding core, the method further comprises: determining whether the entry position of the to-be-wound pole piece needs to be adjusted according to the edge distance of the innermost pole lug.

[0019] According to an embodiment of the present application, the step of determining whether the entry position of the to-be-wound pole piece needs to be adjusted according to the edge distance of the innermost pole lug comprises: calculating the difference between the edge distance of the innermost pole lug and the edge distance of the corresponding pole lug of the standard winding core; if the difference is greater than half of the error tolerance of the corresponding pole lug of the standard winding core, the entry position of the to-be-wound pole piece needs to be adjusted; otherwise, the entry position of the to-be-wound pole piece does not need to be adjusted.

[0020] According to an embodiment of the present application, the step of determining whether the to-be-wound pole piece needs to be corrected according to the error of the winding core and the error tolerance of the standard winding core comprises: when the positive error of the winding core is less than the positive error tolerance of the standard winding core and the negative error of the winding core is less than the negative error tolerance of the standard winding core, it is determined that the to-be-wound positive pole piece and negative pole piece do not need to be corrected; otherwise, the number of pole lugs that need to be corrected of the winding core is counted according to the displacement amount of the pole lugs, and the to-be-wound pole piece is corrected according to the next group of winding cores; wherein the error of the winding core comprises a positive error and a negative error, and the error tolerance of the standard winding core comprises a positive error tolerance and a negative error tolerance.

[0021] According to a specific embodiment of the present application, the step of counting the number of the tabs needing to be corrected according to the tab displacement amount of the core and correcting the tab to be wound according to the next group of cores includes: taking the positive tab whose tab displacement amount is greater than half of the positive error allowance as the positive tab needing to be corrected, and taking the negative tab whose tab displacement amount is greater than half of the negative error allowance as the negative tab needing to be corrected, and accumulating the number of the positive tabs needing to be corrected and the number of the negative tabs needing to be corrected; when the number of the positive tabs needing to be corrected is greater than or equal to half of the number of all the positive tabs except the innermost positive tab of the corresponding core, and the next group of cores repeatedly appears this situation, adjusting the distance between the positive tabs on the positive tab to be wound by the positive laser die cutter unit; when the number of the positive tabs needing to be corrected is less than half of the number of all the positive tabs except the innermost positive tab of the corresponding core, and the next group of cores repeatedly appears this situation, adjusting the thickness of the positive tab to be wound by the positive embossing unit; when the number of the negative tabs needing to be corrected is greater than or equal to half of the number of all the negative tabs except the innermost negative tab of the corresponding core, and the next group of cores repeatedly appears this situation, adjusting the distance between the negative tabs on the negative tab to be wound by the negative laser die cutter unit; when the number of the negative tabs needing to be corrected is less than half of the number of all the negative tabs except the innermost negative tab of the corresponding core, and the next group of cores repeatedly appears this situation, adjusting the thickness of the negative tab to be wound by the negative embossing unit; wherein the tab displacement amount includes the positive tab displacement amount and the negative tab displacement amount, and the number of the tabs needing to be corrected includes the number of the positive tabs needing to be corrected and the number of the negative tabs needing to be corrected.

[0022] According to a specific embodiment of the present application, the actual error and the actual edge distance of the innermost tab of the three consecutive cores after cold pressing are detected by the detection unit, and the calculation method of the detection unit, the position of the tab, the edge distance of the tab, and the error of the core and the tab displacement amount are optimized according to the calculated error of the corresponding core and the edge distance of the innermost tab.

[0023] According to a specific embodiment of the present application, the step of optimizing the calculation mode of the detection unit and the position of the tab, the tab-to-edge distance, and the error of the winding core and the tab displacement amount according to the actual error of the three winding cores after cold pressing and the actual tab-to-edge distance of the innermost layer of the tab and the corresponding error and tab-to-edge distance calculated is: calculating the difference between the actual error of each winding core and the corresponding error and the difference between the actual tab-to-edge distance of the innermost layer of the winding core and the corresponding tab-to-edge distance, and comparing them with the corresponding preset threshold values respectively; if the difference between the actual error of the three winding cores and the corresponding error is greater than the preset first threshold value, or the difference between the actual tab-to-edge distance of the innermost layer of the three winding cores and the corresponding tab-to-edge distance is greater than the preset second threshold value, the working parameters of the detection unit and the calculation mode of the position of the tab, the tab-to-edge distance, and the error of the winding core and the tab displacement amount are compensated.

[0024] The present application provides a correction method for tab displacement, which can detect whether the tab displacement of the winding core after winding is completed, and correct the positive and negative electrode sheets to be wound when the tab displacement exceeds the allowable value, greatly reducing the material scrap of the winding core. At the same time, the appropriate correction method can be automatically selected according to the size of the tab displacement amount for adjustment, the response speed is faster, and the normal production and manufacturing of the winding core will not be affected. In addition, the CCD camera can be used to check the tab displacement data again, and the photoelectric sensor for collecting tab data and the calculation program of the control terminal can be optimized, thereby enhancing the reliability and stability of the correction method, reducing the frequency of manual intervention, and reducing the labor input. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Process flow chart of a specific embodiment of the winding core forming provided by the present application;

[0026] Figure 2 Structure schematic diagram of a specific embodiment of the tab provided by the present application;

[0027] Figure 3 Structure schematic diagram of a specific embodiment of the winding core provided by the present application;

[0028] Figure 4 Structure schematic diagram of another specific embodiment of the winding core provided by the present application;

[0029] Figure 5 Flowchart of a specific embodiment of the correction method of the winding core winding system provided by the present application. DETAILED DESCRIPTION

[0030] The present application will be described with reference to the drawings and preferred embodiments to explain the principles of the application to a person skilled in the art. Other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure herein. The present application can also be implemented or applied in other different specific embodiments, and the details in the specification can be modified or changed in various ways based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0031] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, but not drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the layout pattern of the components can also be more complex.

[0032] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details, and in other embodiments, the known structures and devices are shown in the form of block diagrams rather than in the form of details, to avoid making the embodiments of the present application difficult to understand.

[0033] Embodiment 1

[0034] Please refer to Figure 1 As shown, the present embodiment provides a core winding system, which includes a winding module 10, a die-cutting module 20, an embossing module 30, a correction module 40, and a cold-pressing module 50. The winding module 10 is generally a winding machine, and a plurality of winding needles 11 are usually provided on the winding machine to simultaneously complete the production and manufacturing of the core. The core is wound by the positive plate, the negative plate, and the separator, and the die-cutting module 20 is used to cut a plurality of positive tabs on the positive plate and a plurality of negative tabs on the negative plate. During the winding process, the plurality of positive tabs and the plurality of negative tabs are continuously stacked, and finally the positive tabs and the negative tabs of the core are formed.

[0035] It should be noted that as the length of the positive plate and the negative plate increases, i.e. the number of winding layers increases, the capacity of the wound core is correspondingly increased. However, at the same time, the increase in the length of the positive plate and the negative plate will also lead to an increase in the number of positive tabs and negative tabs, which brings great difficulty to the control of tab misplacement during the winding process.

[0036] In addition, the winding module 10 further includes a positive plate feeding and unwinding unit 12, a negative plate feeding and unwinding unit 13, and a separator feeding and unwinding unit 14, which are respectively used to transmit the positive plate, the negative plate, and the separator to the winding needle 11, so that the winding needle 11 completes the winding work of the core.

[0037] Therefore, in the embodiment, the correction module 40 is configured to correct the next pole piece to be wound according to the tab misalignment data of the last winding core, so as to reduce the number of scrapped winding cores and improve the yield. Specifically, the correction module 40 comprises a detection unit 41 and a control unit 42. The detection unit 41 calculates the position of the tab on the winding core by collecting the first time and the second time when the two side edges of the tab pass through a certain point. In actual application, the detection unit 41 can be an optical sensor arranged on the moving path of the pole piece to detect the first time t1 and the second time t2 when the two side edges of each tab on the pole piece pass through the corresponding optical sensor. Specifically, as shown in Figure 2 .

[0038] In a specific embodiment, since the winding core contains positive pole pieces and negative pole pieces, it is necessary to detect the positive tab misalignment amount and the negative tab misalignment amount. Therefore, the detection unit 41 can comprise a positive detection subunit 411 and a negative detection subunit 412, which are respectively configured to collect the first time t1 and the second time t2 when the positive tab and the negative tab pass through the corresponding fixed point, i.e., an optical sensor is arranged on the moving path of each of the positive pole piece and the negative pole piece to detect the first time t1 and the second time t2 when the two side edges of each positive tab on the positive pole piece pass through the corresponding optical sensor, and the first time t1 and the second time t2 when the two side edges of each negative tab on the negative pole piece pass through the corresponding optical sensor, so as to facilitate the subsequent calculation steps.

[0039] It should be noted that in the embodiment, the optical sensor is used as the detection unit 41, and therefore the position of the fixed point is the position of the optical sensor. The detection unit 41 can also be a high-speed camera or other detection devices, i.e., a reference point can be arranged as the fixed point on the moving path of the pole piece to collect the time when the two side edges of the tab pass through the fixed point. The modifications and embellishments made by those skilled in the art to the embodiments of the present application without departing from the spirit of the present application still fall within the scope of the patent application for the present application.

[0040] The control unit 42 calculates the edge distance of the tab according to the data collected by the detection unit 41, the timing zero point, the angular velocity of the winding needle, the distance from the optical sensor to the winding needle, and the entry position of the pole piece. It should be noted that, as shown in Figure 3 , after the winding of the winding core is completed, the winding core needs to be pressed into a predetermined shape by the cold pressing module 50. Usually, the winding core is pressed according to the position of the tab, so as to press the tab flat. The two ends of the length direction of the cold-pressed winding core and the vertical direction of the axis of the length direction of the winding core are the two side edges of the winding core, and the distance from the positive tab to the same side edge is the edge distance d1 of the positive tab, and the distance from the negative tab to the same side edge is the edge distance d2 of the negative tab.

[0041] Figure 3 In the illustrated embodiment, the left side edge of the positive tab is selected as the reference position, and the distance to the left side edge of the winding core is recorded as the tab edge distance d1 of the positive tab, and the left side edge of the negative tab is selected as the reference position, and the distance to the winding core left side edge is recorded as the tab edge distance d2 of the negative tab. According to actual needs, any position on the tab can be selected as the reference position, and the distance from the reference position to the same side edge is taken as the tab edge distance. It is not necessary to take the distance from the positive tab to the left side edge of the winding core as the tab edge distance of the positive tab, and the distance from the negative tab to the left side edge of the winding core as the tab edge distance of the negative tab. Only the distance from all positive tabs or all negative tabs to the same side edge is taken as the tab edge distance. No further limitation is made.

[0042] The specific calculation method of the tab edge distance can be referred to as follows:

[0043] First, a position on the winding needle can be selected as the zero position, for example, the horizontal line of the winding core blanking position, as shown in Figure 4 It should be noted that in actual application, according to the rotation direction of the winding needle, the pole piece only starts to be wound after passing through the cutting point with the winding needle. Therefore, in this embodiment, the cutting point of the pole piece and the winding needle is taken as the entry position of the pole piece. If the entry position of the pole piece is to be changed, the angle between the pole piece and the winding needle needs to be adjusted to adjust the cutting point position of the pole piece and the winding needle.

[0044] At the same time, the photoelectric sensor is arranged on the moving path of the pole piece. Therefore, the distance from the winding needle to the fixed point is the distance from the photoelectric sensor to the cutting point of the pole piece and the winding needle, recorded as D; and the position of the cutting point of the pole piece and the winding needle is taken as the timing zero t0.

[0045] When the first side edge of the first positive tab passes through the photoelectric sensor, the first time t1 is collected. At this time, the positive pole piece has been wound on the winding needle, and the wound length is the arc length corresponding to the rotation angle of the winding needle within the time from t0 to t1.

[0046] Therefore, the winding arc length l1 of the positive pole piece is (t1-t0)*W*R,

[0047] Where W is the angular velocity of the winding needle, and R is the radius of the winding needle.

[0048] When the second side edge of the first positive tab passes through the photoelectric sensor, the second time t2 is collected. The time from t1 to t2 is the length of the first positive tab, corresponding to the arc length of the positive pole piece wound on the winding needle.

[0049] Therefore, the arc length l2 of the positive tab is (t2-t1)*W*R.

[0050] Based on the distance D from the winding needle to the fixed point, the winding arc length l1 of the positive electrode sheet, and the arc length l2 of the positive electrode lug, i.e. the length from the second side of the first positive electrode lug to the first end of the electrode sheet, the position of the first positive electrode lug can be obtained according to the position of the electrode sheet, i.e. the position of the intersection of the electrode sheet and the winding needle, and the circumference of the winding needle.

[0051] Further, the second time t2 of the first positive electrode lug is taken as the timing zero point of the next positive electrode lug to calculate the length from the second side of the second positive electrode lug to the second side of the first positive electrode lug, and the position of the second positive electrode lug can be calculated according to the position of the first positive electrode lug, the circumference of the winding needle, and the thickness of the positive electrode sheet.

[0052] It should be noted that each layer of the positive electrode sheet contains only one positive electrode lug. Therefore, the winding arc length l1 of the positive electrode sheet corresponding to the same positive electrode lug and the arc length l2 of the positive electrode lug are calculated using the same radius length.

[0053] Meanwhile, after the position of the first positive electrode lug is calculated, the radius of the winding needle starts to increase. Therefore, before the winding arc length l1 of the positive electrode sheet corresponding to the second positive electrode lug is calculated, whether the sum of the angle of rotation within the time t0 to t1 and the angle corresponding to the arc length from the first positive electrode lug to the first end of the electrode sheet is greater than 360 degrees can be determined, and if it is greater than 360 degrees, the angle of rotation within the time t0 to t1 of the second positive electrode lug can be decomposed, and the sum of the thickness of the positive electrode sheet and the radius of the winding needle can be taken as the new radius of the winding needle, so that the winding arc length l1 of the positive electrode sheet corresponding to the second positive electrode lug can be calculated; if it is less than or equal to 360 degrees, the arc length of the positive electrode lug corresponding to the second positive electrode lug can be calculated in the same way, and finally the length from the second side of the second positive electrode lug to the second side of the first positive electrode lug can be obtained, and the position of the second positive electrode lug can be obtained according to the position of the first positive electrode lug and the circumference of the winding needle calculated based on the new radius of the winding needle.

[0054] Similarly, the position of each positive electrode lug on the electrode sheet can be calculated.

[0055] Based on the position of each positive electrode lug on the winding core obtained above and the compensation parameter calculated according to the distance from the edge of the positive electrode lug of a standard winding core after cold pressing, the distance from the edge of the positive electrode lug can be converted. Specifically, in actual application, after the winding of the winding core is completed and before cold pressing, a reference line passing through the center of the winding core can be drawn in the vertical direction of the pressing direction of the cold pressing module 50, the arc length from any side of the positive electrode lug to the reference line can be calculated according to the position of the positive electrode lug on the winding core, and the distance from the edge of the positive electrode lug can be calculated according to the compensation parameter of the standard winding core.

[0056] Similarly, the position and the distance from the edge of each negative electrode lug on the winding core can also be calculated accordingly.

[0057] After the distances from the edge of all the positive tabs and the distances from the edge of all the negative tabs are calculated, the positive error and the negative error of the winding core, and the displacement of the positive tabs and the displacement of the negative tabs can be further calculated. Specifically, the distance from the edge of the first positive tab of the winding core, i.e. the innermost positive tab, is taken as the reference quantity, and the distances from the edge of the remaining positive tabs are compared with the distance from the edge of the innermost positive tab, i.e. the difference is calculated, to obtain the displacement of the remaining positive tabs. In a specific embodiment, if the difference is positive, i.e. the positive tab is shifted to the right, if the difference is negative, i.e. the positive tab is shifted to the left, and the absolute value of the difference reflects the displacement of the positive tab. Further, the maximum value of the displacement of all the positive tabs is taken as the positive error of the winding core. Similarly, the displacement of all the negative tabs and the negative error of the winding core are obtained.

[0058] The control unit 42 judges, based on the positive error and the negative error of the winding core obtained above, and the displacement of all the positive tabs and the displacement of all the negative tabs, whether the next to be wound positive plate and negative plate need to be corrected to reduce the displacement of the positive tabs and the negative tabs in the next to be wound positive plate and negative plate, and to avoid the winding core from being scrapped.

[0059] Specifically, according to the judgment of the positive error of the winding core and the positive error allowance value of the standard winding core, and the judgment of the negative error of the winding core and the negative error allowance value of the standard winding core: if the to be wound positive plate and / or negative plate need to be corrected, then according to the displacement of the positive tabs, the number of positive tabs that need to be corrected is counted, and according to the displacement of the negative tabs, the number of negative tabs that need to be corrected is counted, and the laser cutting unit in the die cutting module 20 and the embossing roller unit in the embossing module 30 are correspondingly controlled to work, to reduce the displacement of the tabs; if no correction is needed, the error and the displacement of the tabs of the next winding core are continued to be detected.

[0060] In a specific embodiment, since the positive plate and the negative plate need to be processed respectively, the laser cutting unit includes a positive laser cutting sub-unit 21 and a negative laser cutting sub-unit 22, which are respectively used to cut positive tabs on the to be wound positive plate and negative tabs on the to be wound negative plate, to adjust the distance between the positive tabs and the distance between the negative tabs. The embossing roller unit includes a positive embossing sub-unit and a negative embossing sub-unit, which are respectively used to construct embossing regions on the to be wound positive plate and the to be wound negative plate, to adjust the thickness of the positive plate and the thickness of the negative plate.

[0061] In addition, the correction module 40 further comprises a checking unit 43 configured to collect the actual positive electrode error and the actual negative electrode error of the cold-pressed core, and the actual edge distance of the innermost positive electrode tab and the actual edge distance of the innermost negative electrode tab. The control unit 42 identifies whether the deviation is too large according to the data collected by the checking unit 43 and the calculated positive electrode error and negative electrode error of the core, and the edge distance of the innermost positive electrode tab and the edge distance of the innermost negative electrode tab. In practical application, the checking unit 43 is usually a CCD camera, which can accurately collect the actual displacement of the tab, and the maximum value thereof is taken as the actual error of the core. At the same time, since the detection unit 41 and the control unit 42 work for a long time, the stability is prone to fluctuation. In order to avoid affecting the detection of the tab displacement, the data collected by the CCD camera is compared with the data calculated by the control unit 42, the calculation program of the control unit 42 and the working parameters of the detection unit 41 are optimized, the reliability of the system is improved, and the frequency of manual intervention is reduced.

[0062] In summary, the system can automatically select a suitable correction method, has a fast response speed, greatly reduces the material scrap in the core production process, and reduces the labor input.

[0063] Embodiment 2

[0064] Please refer to Figure 5 The present embodiment also provides a correction method of a core winding system, comprising:

[0065] Step S100, in the process of winding the pole piece, the detection unit collects the first time and the second time when the two sides of each tab pass through a certain point, and calculates the position of each tab on the core according to the timing zero point and the entering position of the corresponding pole piece.

[0066] Step S200, pre-process the positions of all the tabs to obtain the edge distance of each tab.

[0067] Step S300, compare the edge distance of the innermost tab of the core with the edge distance of each remaining tab to obtain the displacement amount of each remaining tab, and take the maximum value of all the displacement amounts as the error of the core.

[0068] Step S400, according to the error of the core and the error tolerance of the standard core, determine whether the pole piece to be wound needs to be corrected.

[0069] Wherein, by collecting the first time and the second time of each positive pole lug and the first time and the second time of each negative pole lug, the distance to the edge of all positive pole lugs and the distance to the edge of all negative pole lugs are calculated. Based on the distance to the edge of the positive pole lug and the distance to the edge of the negative pole lug, the positive error and the negative error of the roll core, and the displacement of the positive pole lug and the displacement of the negative pole lug are obtained, and it is judged whether the next to be wound positive plate and negative plate need to be corrected.

[0070] However, between judging whether the next to be wound positive plate and negative plate need to be corrected, it can also be judged whether the entry position of the to be wound positive plate and negative plate needs to be adjusted according to the distance to the edge of the innermost layer of the positive pole lug and the distance to the edge of the innermost layer of the negative pole lug, so as to avoid that the entry position of the plate has a serious impact on the displacement of the pole lug.

[0071] Specifically, the difference between the distance to the edge of the innermost layer of the positive pole lug and the distance to the edge of the standard roll core is calculated. If the difference is greater than half of the error allowable value of the standard roll core, the entry position of the next to be wound positive plate is adjusted to avoid the impact of the entry position of the plate on the pole lug, and it is detected whether the next roll core repeatedly appears the situation. When the next roll core returns to normal, the displacement correction of the pole lug of the roll core can be continued. When the above-mentioned situation appears in the continuous three roll cores, the winding module of the roll core may be malfunctioning, and the staff is reminded to repair in time, reducing the material scrap of the roll core. If the difference is less than or equal to half of the error allowable value of the standard roll core, no adjustment is needed, and the displacement correction of the pole lug of the roll core is continued.

[0072] In a specific embodiment, whether the to be wound plate needs to be corrected is judged according to the error of the roll core and the error allowable value of the standard roll core:

[0073] When the positive error of the roll core is less than the positive error allowable value of the standard roll core, and the negative error of the roll core is less than the negative error allowable value of the standard roll core, it is determined that the to be wound positive plate and negative plate do not need to be corrected.

[0074] When the positive error of the roll core is greater than the positive error allowable value of the standard roll core, the number of positive pole lugs that need to be corrected is counted according to the displacement of the positive pole lug, so as to correct the to be wound positive plate.

[0075] When the negative error of the roll core is greater than the negative error allowable value of the standard roll core, the number of negative pole lugs that need to be corrected is counted according to the displacement of the negative pole lug, so as to correct the to be wound negative plate.

[0076] Wherein, in order to avoid contingency, when the positive electrode error of the roll core is greater than the positive electrode error allowable value of the standard roll core, or the negative electrode error of the roll core is greater than the negative electrode error allowable value of the standard roll core, the next group of positive electrode sheets and negative electrode sheets are continuously wound, and the error of the roll core and the dislocation amount of the tabs are re-detected after winding is completed, if the error of the roll core is still greater than the error allowable value of the standard roll core, the positive electrode sheet or the negative electrode sheet to be wound needs to be corrected; if the error of the roll core returns to normal, it is indicated that other factors may cause the last group of winding to be abnormal, and correction is temporarily not required, thereby greatly improving the reliability of correction.

[0077] Specifically, when the positive electrode error of the roll core is greater than the positive electrode error allowable value of the standard roll core, the positive electrode tabs with a dislocation amount greater than half of the positive electrode error allowable value of the standard roll core are taken as the positive electrode tabs needing correction, and the number of the positive electrode tabs needing correction is accumulated.

[0078] Further, the positive electrode laser die-cutting unit and the positive electrode embossing unit are controlled according to the number of the positive electrode tabs needing correction:

[0079] When the number of the positive electrode tabs needing correction is greater than or equal to half of the number of all the positive electrode tabs in the roll core except the innermost layer of positive electrode tabs, the spacing between the positive electrode tabs on the positive electrode sheet to be wound is adjusted by the positive electrode laser die-cutting unit, so as to adjust the dislocation of the positive electrode tabs of the roll core.

[0080] When the number of the positive electrode tabs needing correction is less than half of the number of all the positive electrode tabs in the roll core except the innermost layer of positive electrode tabs, the thickness of the positive electrode sheet to be wound is adjusted by the positive electrode embossing unit, so as to adjust the dislocation of the positive electrode tabs of the roll core.

[0081] Correspondingly, in order to avoid contingency, when the number of the positive electrode tabs needing correction is greater than or equal to half of the number of all the positive electrode tabs in the roll core except the innermost layer of positive electrode tabs, or when the number of the positive electrode tabs needing correction is less than half of the number of all the positive electrode tabs in the roll core except the innermost layer of positive electrode tabs, it is detected whether the situation is repeatedly occurred, and after the situation is repeatedly occurred, the positive electrode laser die-cutting unit or the positive electrode embossing unit is adjusted.

[0082] Similarly, the number of the negative electrode tabs needing correction is counted, and the negative electrode laser die-cutting unit and the negative electrode embossing unit are controlled according to the number of the negative electrode tabs needing correction:

[0083] When the number of the negative electrode tabs needing correction is greater than or equal to half of the number of all the negative electrode tabs in the roll core except the innermost layer of negative electrode tabs, the spacing between the negative electrode tabs on the negative electrode sheet to be wound is adjusted by the negative electrode laser die-cutting unit, so as to adjust the dislocation of the negative electrode tabs of the roll core.

[0084] When the number of negative tabs needing correction is less than half of the number of all negative tabs in the roll core except the innermost negative tab, the thickness of the negative tab to be wound is adjusted by the negative embossing sub-unit, so as to adjust the dislocation of the positive tabs of the roll core.

[0085] Correspondingly, in order to avoid contingency, when the number of negative tabs needing correction is greater than or equal to half of the number of all negative tabs in the roll core except the innermost negative tab, or when the number of negative tabs needing correction is less than half of the number of all negative tabs in the roll core except the innermost negative tab, it is detected whether the next group of roll cores repeats the situation, and after the situation is repeated, the negative laser die-cutting sub-unit or the negative embossing sub-unit is adjusted.

[0086] It should be noted that the above adjustment of the distance between the tabs and the thickness of the tab can also be replaced by other methods, such as the method of changing the winding diameter of the winding needle to replace the adjustment of the distance between the tabs. In actual use, the product requirements can be selected, and the modifications and decorations made by the person skilled in the art without departing from the spirit of the present application still fall within the scope of the present application.

[0087] In addition, it also includes: detecting the actual error of the three consecutive roll cores after cold pressing and the actual edge distance of the innermost tab by the checking unit, and optimizing the calculation method of the detection unit and the position of the tab, the edge distance of the tab, and the error of the roll core and the dislocation amount of the tab according to the corresponding error of the roll core and the edge distance of the innermost tab.

[0088] Specifically, the difference between the actual positive error of each roll core and the corresponding positive error is calculated to obtain three difference values a1, a2, and a3. If the three difference values a1, a2, and a3 all exceed 5% of the positive error of the roll core, the calculation method of the positive error of the roll core is compensated.

[0089] The difference between the actual negative error of each roll core and the corresponding negative error is calculated to obtain three difference values b1, b2, and b3. If the three difference values b1, b2, and b3 all exceed 5% of the negative error of the roll core, the calculation method of the negative error of the roll core is compensated.

[0090] The difference between the actual edge distance of the innermost positive tab of each roll core and the corresponding edge distance is calculated to obtain three difference values c1, c2, and c3. If the three difference values c1, c2, and c3 are all greater than 5% of the edge distance of the innermost positive tab of the roll core, the calculation method of the edge distance of the innermost positive tab of the roll core is compensated.

[0091] The actual edge distance of the innermost layer of the negative tab of each winding core and the difference between the corresponding edge distance are calculated to obtain three difference values d1, d2 and d3, and if the three difference values d1, d2 and d3 are all greater than 5% of the edge distance of the innermost layer of the negative tab of the winding core, the calculation method of the edge distance of the innermost layer of the negative tab of the winding core is compensated.

[0092] In addition, the working parameters of the detection unit are adjusted according to the actual error and the corresponding error of each winding core, and the actual edge distance and the corresponding edge distance of the innermost layer of the tab, so as to avoid the influence caused by the reduced accuracy of the first moment and the second moment when the tab passes through.

[0093] The preset first threshold value is 5% of the error of the winding core, and the preset second threshold value is 5% of the edge distance of the innermost layer of the tab, which is only a preferred embodiment, and can be selected according to actual conditions, and the percentage can also be adjusted. The modification and decoration of the embodiments of the present application by those skilled in the art without departing from the spirit of the present application still fall within the scope of the patent application.

[0094] It should be noted that the step division of the above methods is only for the purpose of clear description, and can be combined into one step or some steps can be split and decomposed into multiple steps, as long as the same logical relationship is contained, and all fall within the protection scope of the present patent. Adding insignificant modifications or introducing insignificant designs in the algorithm or process, but not changing the core design of the algorithm and process, are within the protection scope of the present patent.

[0095] In summary, the present application provides a correction method for the tab misalignment phenomenon, which can detect whether the tab misalignment occurs after the winding is completed, and corrects the positive and negative plates to be wound when the tab misalignment exceeds the allowable value, greatly reducing the material scrap of the winding core. At the same time, the appropriate correction method can be automatically selected according to the size of the tab misalignment amount for adjustment, the response speed is faster, and the normal production and manufacturing of the winding core will not be affected. In addition, the misalignment data of the tab can be checked again by the CCD camera, and the photoelectric sensor for collecting the tab data and the calculation program of the control terminal can be optimized, so as to strengthen the reliability and stability of the correction method, reduce the frequency of manual intervention, and reduce the labor input.

[0096] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and category of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A core winding system, characterized by, The application relates to a winding module, a die-cutting module, an embossing module and a correction module. The winding module comprises a winding needle for winding the pole piece and the diaphragm to form a winding core. The die-cutting module comprises a laser die-cutting unit for die-cutting the pole lug on the edge of the pole piece. The embossing module comprises an embossing roller unit for constructing an embossed area on the pole piece. The correction module comprises a detection unit, a control unit and a verification unit. The detection unit is used for collecting the first time and the second time when the opposite two side edges of the pole lug pass through certain points during the winding process, and the steps comprise collecting the first time when the one side edge of the positive pole lug passes through the corresponding fixed point, collecting the first time when the one side edge of the negative pole lug passes through the corresponding fixed point, collecting the second time when the other side edge of the positive pole lug passes through the corresponding fixed point, collecting the second time when the other side edge of the negative pole lug passes through the corresponding fixed point, taking the corresponding second time as a new timing zero point, and outputting the collected data to the control unit. The control unit calculates the edge distance of the pole lug according to the data collected by the detection unit, the timing zero point, the angular velocity of the winding needle, the distance from the winding needle to the fixed point and the entry position of the pole piece, and the steps comprise: calculating the phase angle of the winding needle from the timing zero point to the first time according to the angular velocity of the winding needle, and converting the phase angle into the winding arc length of the pole piece to obtain the winding arc length of the positive pole piece and the winding arc length of the negative pole piece respectively; calculating the phase angle of the winding needle from the first time to the second time according to the angular velocity of the winding needle, and converting the phase angle into the arc length of the pole lug to obtain the arc length of the positive pole lug and the arc length of the negative pole lug respectively; calculating the position of the positive pole lug according to the distance from the corresponding fixed point to the winding needle, the entry position of the positive pole piece or the position of the previous positive pole lug, and the winding arc length of the positive pole piece and the arc length of the positive pole lug, and calculating the position of the negative pole lug according to the distance from the corresponding fixed point to the winding needle, the entry position of the negative pole piece or the position of the previous negative pole lug, and the winding arc length of the negative pole piece and the arc length of the negative pole lug; the position of the pole lug comprises the position of the positive pole lug and the position of the negative pole lug; calculating the corresponding edge distance of the positive pole lug according to the position of the positive pole lug, and calculating the corresponding edge distance of the negative pole lug according to the position of the negative pole lug; The edge distance of the pole lug is the distance from the pole lug to the side edge of the winding core after cold pressing. The control unit further calculates the error of the corresponding winding core and the misplacement amount of the pole lug according to the edge distance of all the pole lugs, and the steps comprise: taking the difference between the edge distance of each remaining positive pole lug and the edge distance of the innermost positive pole lug as the misplacement amount of the corresponding positive pole lug, and taking the maximum value in all the misplacement amounts of the positive pole lugs as the positive error of the winding core; taking the difference between the edge distance of each remaining negative pole lug and the edge distance of the innermost negative pole lug as the misplacement amount of the corresponding negative pole lug, and taking the maximum value in all the misplacement amounts of the negative pole lugs as the negative error of the winding core; The error of the winding core comprises the positive error and the negative error, and the misplacement amount of the pole lug comprises the misplacement amount of the positive pole lug and the misplacement amount of the negative pole lug. The control unit is further configured to determine whether to correct the to-be-wound pole piece based on the error of the winding core, and control the laser die-cutting unit and the embossing roller unit to work according to the dislocation amount of the tab. The checking unit is configured to collect actual errors of the winding cores after cold pressing and actual edge distances of the innermost tabs, including detecting actual errors of three continuous winding cores after cold pressing and actual edge distances of the innermost tabs, and outputting the collected data to the control unit. The control unit is further configured to optimize the calculation mode of the detection unit and the position of the tab, the edge distance of the tab, and the error of the winding core and the dislocation amount of the tab, and optimize the working parameters of the detection unit according to the data collected by the checking unit and the error of the winding core and the edge distance of the innermost tab, and the step includes: calculating the difference between the actual error and the corresponding error of each winding core, and the difference between the actual edge distance and the corresponding edge distance of the innermost tab, and comparing them with the corresponding preset threshold values respectively; If the difference between the actual error and the corresponding error of the three winding cores is greater than the preset first threshold value, or the difference between the actual edge distance and the corresponding edge distance of the innermost tab of the three winding cores is greater than the preset second threshold value, the working parameters of the detection unit and the calculation mode of the position of the tab, the edge distance of the tab, and the error of the winding core and the dislocation amount of the tab are compensated.

2. The core winding system according to claim 1, characterized in that Further comprising: a cold pressing module configured to press the winding core into a preset shape.

3. The core winding system according to claim 1, characterized in that The detection unit includes a positive detection subunit and a negative detection subunit for collecting the first time and the second time when the positive tab and the negative tab pass through the corresponding fixed point respectively. The laser die-cutting unit includes a positive laser die-cutting subunit and a negative laser die-cutting subunit for cutting the positive tab on the positive pole piece and the negative tab on the negative pole piece respectively. The embossing roller unit includes a positive embossing subunit and a negative embossing subunit for constructing an embossed area on the positive pole piece and the negative pole piece respectively.

4. The winding core winding system according to claim 3, wherein The control unit calculates the positive error of the corresponding winding core and the dislocation amount of the positive tab according to the data collected by the positive detection subunit and the timing zero point, the angular velocity of the winding needle, the distance from the winding needle to the corresponding fixed point, and the entering position of the positive pole piece. The control unit further calculates the negative error of the corresponding winding core and the dislocation amount of the negative tab according to the data collected by the negative detection subunit and the timing zero point, the angular velocity of the winding needle, the distance from the winding needle to the corresponding fixed point, and the entering position of the negative pole piece. The error of the winding core includes the positive error and the negative error, and the dislocation amount of the tab includes the dislocation amount of the positive tab and the dislocation amount of the negative tab.

5. The winding core winding system according to claim 4, wherein The control unit determines whether to correct the to-be-wound positive pole piece based on the positive error of the winding core, and controls the positive laser die-cutting subunit and the positive embossing subunit to work according to the number of positive tabs that need to be corrected and the dislocation amount of the positive tab. The control unit also judges whether to correct the negative electrode sheet to be wound based on the negative error of the core, and controls the negative laser die-cutting unit and the negative embossing unit to work according to the number of negative electrode tabs needing correction counted according to the displacement amount of the negative electrode tabs.

6. A method of correcting a core winding system, characterized by, The correction method is applied to the core winding system of any one of claims 1 to 5, and the correction method comprises: During the winding of the electrode sheet, the detection unit collects the first time and the second time when the two side edges of each electrode tab pass through a certain point, and calculates the position of each electrode tab on the core according to the timing zero point and the entry position of the corresponding electrode sheet; The positions of all the electrode tabs are preprocessed to obtain the edge distance of each electrode tab; The edge distance of the innermost electrode tab of the core is compared with the edge distance of each of the remaining electrode tabs to obtain the displacement amount corresponding to each of the remaining electrode tabs, and the maximum value among all the displacement amounts is taken as the error of the core; According to the error of the core and the error allowance of the standard core, it is judged whether the electrode sheet to be wound needs to be corrected.

7. The correction method of the core winding system according to claim 6, characterized by, The step of preprocessing the positions of all the electrode tabs to obtain the edge distance of each electrode tab comprises: The edge distance of the positive electrode tab and the edge distance of the negative electrode tab are calculated according to the position of the electrode tab and the compensation parameter of the core after cold pressing; the edge distance of the electrode tab includes the edge distance of the positive electrode tab and the edge distance of the negative electrode tab.

8. The correction method of the core winding system according to claim 6, characterized by, Before judging whether the electrode sheet to be wound needs to be corrected according to the error of the core and the error allowance of the standard core, the method further comprises: According to the edge distance of the innermost electrode tab, it is judged whether the entry position of the electrode sheet to be wound needs to be adjusted.

9. The correction method of the core winding system according to claim 8, characterized by, The step of judging whether the entry position of the electrode sheet to be wound needs to be adjusted according to the edge distance of the innermost electrode tab comprises: The difference between the edge distance of the innermost electrode tab and the edge distance of the corresponding electrode tab of the standard core is calculated: If the difference is greater than half of the error allowance of the corresponding electrode tab of the standard core, the entry position of the electrode sheet to be wound is adjusted accordingly; Otherwise, no adjustment is needed.

10. The correction method of the core winding system according to claim 6, characterized by, The step of judging whether the electrode sheet to be wound needs to be corrected according to the error of the core and the error allowance of the standard core comprises: When the positive error of the core is less than the positive error allowance of the standard core, and the negative error of the core is less than the negative error allowance of the standard core, it is determined that the positive electrode sheet and the negative electrode sheet to be wound do not need to be corrected; Otherwise, the number of electrode tabs needing correction of the core is counted according to the displacement amount of the electrode tab, and the electrode sheet to be wound is corrected according to the next group of cores; The error of the core includes the positive error and the negative error, and the error allowance of the standard core includes the positive error allowance and the negative error allowance.

11. The correction method of the core winding system according to claim 10, wherein The step of counting the number of electrode tabs needing correction of the core according to the displacement amount of the electrode tab, and correcting the electrode sheet to be wound according to the next group of cores comprises: all positive tab ears whose dislocation amount is greater than half of the positive error allowance value are taken as the positive tab ears needing correction, and all negative tab ears whose dislocation amount is greater than half of the negative error allowance value are taken as the negative tab ears needing correction, to obtain the number of positive tab ears needing correction and the number of negative tab ears needing correction: when the number of positive tab ears needing correction is greater than or equal to half of the number of all positive tab ears except the innermost positive tab ear of the corresponding core, and the next group of cores repeatedly appears this situation, the distance between the positive tab ears on the positive tab sheet to be wound is adjusted by the positive laser die cutter unit; when the number of positive tab ears needing correction is less than half of the number of all positive tab ears except the innermost positive tab ear of the corresponding core, and the next group of cores repeatedly appears this situation, the thickness of the positive tab sheet to be wound is adjusted by the positive embossing unit; when the number of negative tab ears needing correction is greater than or equal to half of the number of all negative tab ears except the innermost negative tab ear of the corresponding core, and the next group of cores repeatedly appears this situation, the distance between the negative tab ears on the negative tab sheet to be wound is adjusted by the negative laser die cutter unit; when the number of negative tab ears needing correction is less than half of the number of all negative tab ears except the innermost negative tab ear of the corresponding core, and the next group of cores repeatedly appears this situation, the thickness of the negative tab sheet to be wound is adjusted by the negative embossing unit; wherein the dislocation amount of the tab includes the dislocation amount of the positive tab and the dislocation amount of the negative tab, and the number of tabs needing correction includes the number of positive tab ears needing correction and the number of negative tab ears needing correction.

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