Core winding system and correction method

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a roll core winding system and a correction method, and the roll core winding system comprises a winding module which comprises a winding needle which is used for winding a pole piece and a diaphragm to form a roll core; the die cutting module comprises a laser die cutting unit and is used for performing die cutting on the edge of the pole piece to form a pole lug; the knurling module comprises a knurling roller unit and is used for constructing a knurling area on the pole piece; the correction module comprises a detection unit and a control unit, and the detection unit is used for collecting a first moment and a second moment when the two opposite side edges of the tab pass through a fixed point respectively in the winding process; the control unit is used for calculating the error of the winding core and the dislocation amount of the tab according to the data acquired by the detection unit, the timing zero point, the angular speed of the winding needle, the distance from the winding needle to a fixed point and the feeding position of the pole piece; and whether the to-be-wound pole piece is corrected or not is judged based on the error of the winding core, and the laser die cutting unit and the embossing roller unit are correspondingly controlled to work according to the dislocation amount of the pole lug.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a core winding system and a correction method. Background Art

[0002] With the development of lithium battery technology, the requirements for the capacity of single cells are getting higher and higher. The high-capacity single cells bring about an increase in the number of winding layers and the number of tabs, which brings great challenges to the control of tab misalignment during the winding process.

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

[0004] Among them, manual correction has relatively high requirements on the operator, and requires rich operating experience, otherwise it will lead to a large number of cores being scrapped. Secondly, the manual correction process (tearing off Teflon or manually adjusting the distance between the tabs) requires the winding equipment to be shut down, which will affect the normal operation of the production line.

[0005] In addition, there are some automatic adjustment methods that use CCD (charge coupled device) cameras to detect the misalignment of the tabs after cold pressing, and adjust the winding machine parameters accordingly to avoid mass production of defective battery cells. However, in actual applications, there are generally 2-3 winding needles on the winding machine turret. When a core is loaded and unloaded from the winding needle to the CCD camera position, several cores have been piled up. If the tab of one of the cores is seriously misaligned, it is likely that the misalignment of the next few cores is also serious. The misalignment of the tab of the core cannot be corrected in time, which seriously affects the yield of the core production. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for correcting the misalignment of the tabs, which can timely correct the misalignment of the tabs of the next winding core and reduce manual intervention. In addition, timely checking the correction result of the misalignment of the tabs greatly improves the reliability of the correction method.

[0007] To achieve the above-mentioned purpose and other related purposes, the present invention provides a core winding system, including: a winding module, including a winding needle, the winding needle is used to wind the pole piece and the diaphragm to form a core; a die-cutting module, including a laser die-cutting unit, used to die-cut a pole ear at the edge of the pole piece; an embossing module, including an embossing roller unit, used to construct an embossing area on the pole piece; a correction module, including a detection unit and a control unit, the detection unit is used to collect the first moment and the second moment when the two opposite sides of the pole ear pass through a certain point respectively during the winding process, and output the collected data to the control unit; A control unit calculates the distance from the pole ear to the edge based on 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 control unit also calculates the corresponding winding core error and the misalignment of the pole ear based on the distances from the edges of all the pole ears; the distance from the edge of the pole ear is the distance from the pole ear to the side of the winding core after cold pressing; the control unit is also used to determine whether to correct the pole piece to be wound based on the error of the winding core, and control the operation of the laser die-cutting unit and the embossing roller unit accordingly according to the misalignment of the pole ear.

[0008] According to a specific embodiment of the present invention, it also includes: a cold pressing module, used for pressing the core into a preset shape.

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

[0010] According to a specific embodiment of the present invention, the control unit is also used to optimize its own calculation program and the working parameters of the detection unit according to the data collected by the verification unit, the calculated error of the winding core, and the distance from the innermost pole ear to the edge.

[0011] According to a specific embodiment of the present invention, the detection unit includes a positive pole detection subunit and a negative pole detection subunit, which are respectively used to collect the first moment and the second moment when the positive pole ear and the negative pole ear pass through the corresponding fixed point; the laser die-cutting unit includes a positive pole laser die-cutting subunit and a negative pole laser die-cutting subunit, which are respectively used to cut out the positive pole ear on the positive pole sheet and cut out the negative pole ear on the negative pole sheet; the embossing roller unit includes a positive pole embossing subunit and a negative pole embossing subunit, which are respectively used to construct embossing areas on the positive pole sheet and the negative pole sheet.

[0012] According to a specific embodiment of the present invention, the control unit calculates the positive electrode error of the corresponding winding core and the misalignment of the positive electrode ear according to the data collected by the positive electrode detection subunit, as well as 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 electrode sheet; the control unit also calculates the negative electrode error of the corresponding winding core and the misalignment of the negative electrode ear according to the data collected by the negative electrode detection subunit, as well as 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 electrode sheet; wherein the error of the winding core includes the positive electrode error and the negative electrode error, and the misalignment of the electrode ear includes the misalignment of the positive electrode ear and the misalignment of the negative electrode ear.

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

[0014] A correction method for a core winding system comprises: in a pole piece winding process, collecting the first moment and the second moment when the two sides of each pole ear pass through a certain point respectively through a detection unit, and calculating the position of each pole ear on the core according to the timing zero point and the entry position of the corresponding pole piece; pre-processing the positions of all the pole ears to obtain the distance to the edge of each pole ear; comparing the distance to the edge of the innermost pole ear of the core with the distance to the edge of each other pole ear to obtain the misalignment amount corresponding to each other pole ear, and taking the maximum value of all the misalignment amounts as the error of the core; judging whether the pole piece to be wound needs to be corrected according to the error of the core and the error allowable value of the standard core.

[0015] According to a specific embodiment of the present invention, during the winding process of the electrode sheet, the first moment and the second moment when the two sides of each electrode ear pass through a certain point are collected by the detection unit, and the position of each electrode ear on the winding core is calculated according to the timing zero point and the entry position of the corresponding electrode sheet. The steps include: collecting the first moment when one side of the positive electrode ear passes through the corresponding fixed point, and the first moment when one side of the negative electrode ear passes through the corresponding fixed point; calculating the phase angle of the winding needle between the timing zero point and the first moment according to the angular velocity of the winding needle, and converting it into the winding arc length of the electrode sheet, and obtaining the winding arc length of the positive electrode sheet and the winding arc length of the negative electrode sheet respectively; collecting the second moment when the other side of the positive electrode ear passes through the corresponding fixed point, and the second moment when the other side of the negative electrode ear passes through the corresponding fixed point respectively. The second moment of the fixed point should be calculated, and the corresponding second moment is used as the new timing zero point; according to the angular velocity of the winding needle, the phase angle of the winding needle between the first moment and the second moment is calculated, and converted into the arc length of the pole ear, and the arc length of the positive pole ear and the arc length of the negative pole ear are obtained respectively; the position of the positive pole ear is calculated according to the distance from the corresponding fixed point to the winding needle and the entry position of the positive pole sheet, or the position of the previous positive pole ear, and the winding arc length of the positive pole sheet and the arc length of the positive pole ear; and the position of the negative pole ear is calculated according to the distance from the corresponding fixed point to the winding needle and the entry position of the negative pole sheet, or the position of the previous negative pole ear, and the winding arc length of the negative pole sheet and the arc length of the negative pole ear; the position of the pole ear includes the position of the positive pole ear and the position of the negative pole ear.

[0016] According to a specific embodiment of the present invention, the step of preprocessing the positions of all the pole ears to obtain the distance to the edge of each pole ear includes: calculating the distance to the edge of the positive pole ear and the distance to the edge of the negative pole ear respectively according to the position of the pole ear and the compensation parameters of the winding core after cold pressing; the distance to the edge of the pole ear includes the distance to the edge of the positive pole ear and the distance to the edge of the negative pole ear.

[0017] According to a specific embodiment of the present invention, the step of comparing the edge distance of the innermost electrode ear of the winding core with the edge distance of each remaining electrode ear to obtain the corresponding misalignment amount of each remaining electrode ear, and taking the maximum value of all misalignment amounts as the error of the winding core includes: taking the difference between the edge distance of each remaining positive electrode ear and the edge distance of the innermost positive electrode ear as the corresponding misalignment amount of the positive electrode ear, and taking the maximum value of all the misalignment amounts of the positive electrode ears as the positive electrode error of the winding core; taking the difference between the edge distance of each remaining negative electrode ear and the edge distance of the innermost negative electrode ear as the corresponding misalignment amount of the negative electrode ear, and taking the maximum value of all the misalignment amounts of the negative electrode ears as the negative electrode error of the winding core; wherein the error of the winding core includes positive electrode error and negative electrode error, and the misalignment amount of the electrode ears includes positive electrode misalignment amount and negative electrode misalignment amount.

[0018] According to a specific embodiment of the present invention, before judging whether it is necessary to correct the pole piece to be wound based on the error of the winding core and the allowable error value of the standard winding core, it also includes: judging whether it is necessary to adjust the entry position of the pole piece to be wound based on the distance from the edge of the innermost pole ear.

[0019] According to a specific embodiment of the present invention, the step of judging whether it is necessary to adjust the entry position of the pole piece to be wound based on the edge distance of the innermost pole ear includes: calculating the difference between the edge distance of the innermost pole ear and the edge distance of the pole ear corresponding to the standard winding core: if the difference is greater than half of the allowable error value corresponding to the standard winding core, then adjusting the entry position of the pole piece to be wound accordingly; otherwise, no adjustment is required.

[0020] According to a specific embodiment of the present invention, the step of judging whether it is necessary to correct the electrode sheet to be wound based on the error of the winding core and the allowable error value of the standard winding core includes: when the positive pole error of the winding core is less than the allowable positive pole error value of the standard winding core, and the negative pole error of the winding core is less than the allowable negative pole error value of the standard winding core, it is judged that it is not necessary to correct the positive pole sheet and the negative pole sheet to be wound; otherwise, the number of pole ears that need to be corrected of the winding core is counted according to the misalignment amount of the pole ears, and the pole sheet to be wound is corrected based on the next group of winding cores; wherein the error of the winding core includes positive pole error and negative pole error, and the allowable error value of the standard winding core includes positive pole error allowable value and negative pole error allowable value.

[0021] According to a specific embodiment of the present invention, the step of counting the number of pole ears that need to be corrected on the winding core according to the misalignment of the pole ears, and correcting the pole sheet to be wound according to the next group of winding cores includes: taking the positive pole ears whose misalignment is greater than half of the allowable value of the positive electrode error among all the positive pole ears as the positive pole ears that need to be corrected, and taking the negative pole ears whose misalignment is greater than half of the allowable value of the negative electrode error among all the negative pole ears as the negative pole ears that need to be corrected, and accumulating the number of positive pole ears that need to be corrected and the number of negative pole ears that need to be corrected: when the number of positive pole ears that need to be corrected is greater than or equal to half of the number of all positive pole ears except the innermost positive pole ears of the corresponding winding core, and this situation is repeated in the next group of winding cores, the spacing between the positive pole ears on the positive electrode sheet to be wound is correspondingly adjusted by the positive electrode laser die-cutting subunit; when the number of positive pole ears that need to be corrected is less than the number of positive pole ears except the innermost positive pole ears of the corresponding winding core When the number of negative pole ears that need to be corrected is greater than or equal to half of the number of all negative pole ears on the corresponding winding core except the innermost negative pole ears, and this situation occurs repeatedly in the next group of winding cores, the thickness of the positive electrode sheet to be wound is adjusted accordingly by the positive electrode embossing sub-unit; when the number of negative pole ears that need to be corrected is greater than or equal to half of the number of all negative pole ears on the corresponding winding core except the innermost negative pole ears, and this situation occurs repeatedly in the next group of winding cores, the spacing between the negative pole ears on the negative electrode sheet to be wound is adjusted accordingly by the negative electrode laser die-cutting sub-unit; when the number of negative pole ears that need to be corrected is less than half of the number of all negative pole ears on the corresponding winding core except the innermost negative pole ears, and this situation occurs repeatedly in the next group of winding cores, the thickness of the negative electrode sheet to be wound is adjusted accordingly by the negative electrode embossing sub-unit; wherein, the misalignment amount of the pole ears includes the misalignment amount of the positive pole ears and the misalignment amount of the negative pole ears, and the number of pole ears that need to be corrected includes the number of positive pole ears that need to be corrected and the number of negative pole ears that need to be corrected.

[0022] According to a specific embodiment of the present invention, the actual error of the winding core after three consecutive cold pressing and the actual distance to the edge of the innermost pole ear are detected by a verification unit, and based on the calculated corresponding error of the winding core and the distance to the edge of the innermost pole ear, the position of the detection unit and the pole ear, the distance to the edge of the pole ear, and the calculation method of the error of the winding core and the misalignment of the pole ear are optimized.

[0023] According to a specific embodiment of the present invention, the step of detecting the actual error of three consecutive cold-pressed cores and the actual edge distance of the innermost lug through the verification unit, and optimizing the position of the detection unit and the lug, the edge distance of the lug, and the calculation method of the error of the core and the misalignment of the lug based on the calculated corresponding error of the core and the edge distance of the innermost lug includes: calculating the difference between the actual error and the corresponding error of each core, and the difference between the actual edge distance and the corresponding edge distance of the innermost lug, and comparing them with the corresponding preset thresholds respectively; if the difference between the actual error and the corresponding error of the three cores is greater than the preset first threshold, or the difference between the actual edge distance and the corresponding edge distance of the innermost lug of the three cores is greater than the preset second threshold, then the working parameters of the detection unit and the position of the lug, the edge distance of the lug, and the calculation method of the error of the core and the misalignment of the lug are compensated.

[0024] The present invention provides a correction method for the misalignment of the tabs, which can detect whether the tabs are misaligned in the winding core after winding is completed, and correct the positive and negative pole sheets to be wound after the misalignment exceeds the allowable value, which greatly reduces the scrapping of materials in the winding core. At the same time, the appropriate correction method can be automatically selected for adjustment according to the size of the misalignment of the tabs, and the response speed is faster, which will not affect the normal production of the core. In addition, the misalignment data of the tabs can be secondary verified by a CCD camera, and the photoelectric sensor for collecting the 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 manual input. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A process flow chart of a specific embodiment of core forming provided by the present invention;

[0026] Figure 2 A schematic structural diagram of a specific embodiment of a tab provided by the present invention;

[0027] Figure 3 This is a structural schematic diagram of a specific embodiment of the winding core provided by the present invention;

[0028] Figure 4 This is a schematic structural diagram of another specific embodiment of the winding core provided by the present invention;

[0029] Figure 5 The present invention provides a flow chart of a method for calibrating a core winding system according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

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

[0033] Example 1

[0034] See also Figure 1 As shown, this embodiment provides a core winding system, including: a winding module 10, a die-cutting module 20, an embossing module 30, a correction module 40, and a cold pressing module 50. Among them, the winding module 10 is generally a winding machine, and usually a plurality of winding needles 11 are provided on the winding machine, and the plurality of winding needles 11 work simultaneously to complete the production of the core. The core is wound by the positive electrode sheet, the negative electrode sheet, and the diaphragm, and the die-cutting module 20 is used to cut a plurality of positive electrode ears on the positive electrode sheet, and a plurality of negative electrode ears on the negative electrode sheet. During the winding process, a plurality of positive electrode ears and a plurality of negative electrode ears are continuously stacked to finally form the positive electrode ears and negative electrode ears of the core.

[0035] It should be noted that as the length of the positive and negative electrode sheets increases, that is, the number of winding layers increases, the capacity of the wound battery cell increases accordingly. However, at the same time, the increase in the length of the positive and negative electrode sheets will also lead to an increase in the number of positive and negative electrode ears, which brings great difficulties to the control of the ear misalignment during the winding process.

[0036] In addition, the winding module 10 also includes: a positive electrode loading and unwinding unit 12, a negative electrode loading and unwinding unit 13, and a diaphragm loading and unwinding unit 14, which are respectively used to transmit positive electrode sheets, negative electrode sheets, and diaphragms to the winding needle 11 so that the winding needle 11 completes the winding work of the core.

[0037] Therefore, in this embodiment, the correction module 40 is used to correct the next pole piece to be wound according to the pole piece misalignment data of the previous winding core, so as to reduce the number of scrapped winding cores and improve the yield rate. Specifically, the correction module 40 includes a detection unit 41 and a control unit 42. The detection unit 41 calculates the position of the pole piece on the winding core by collecting the first moment and the second moment when the two opposite sides of the pole piece pass through a certain point. In practical applications, the detection unit 41 can be a photoelectric sensor, which is arranged on the moving path of the pole piece, and is used to detect the first moment t1 and the second moment t2 when the two sides of each pole piece on the pole piece pass through the corresponding photoelectric sensor. Specifically, it can be as follows Figure 2 shown.

[0038] In a specific embodiment, since positive and negative electrode sheets are included, it is necessary to detect the misalignment of the positive and negative electrode ears of the winding core. Therefore, the detection unit 41 may include a positive electrode detection subunit 411 and a negative electrode detection subunit 412, which are respectively used to collect the first moment t1 and the second moment t2 when the positive and negative electrode ears pass through the corresponding fixed points, that is, a photoelectric sensor is respectively set on the moving path of the positive and negative electrode sheets to detect the first moment t1 and the second moment t2 when the two sides of each positive electrode ear on the positive electrode sheet pass through the corresponding photoelectric sensor, and the first moment t1 and the second moment t2 when the two sides of each negative electrode ear on the negative electrode sheet pass through the corresponding photoelectric sensor, so as to facilitate the subsequent calculation steps.

[0039] It should be noted that in this embodiment, a photoelectric sensor is used as the detection unit 41, so the position of the fixed point is the position of the photoelectric sensor. The detection unit 41 can also be other detection devices such as a high-speed camera, that is, a reference point can be set as a fixed point on the moving path of the pole piece to collect the moment when the two sides of the pole ear pass through the fixed point. The modifications and embellishments made to the embodiments of the present invention by those skilled in the art without departing from the spirit of the present invention still fall within the scope of the invention application of the present invention.

[0040] The control unit 42 calculates the distance from the pole ear to the edge based on the data collected by the detection unit 41, the timing zero point, the angular velocity of the winding needle, the distance from the photoelectric sensor to the winding needle, and the entry position of the pole piece. Figure 3 As shown, after the winding of the core is completed, it needs to be pressed into a preset shape by the cold pressing module 50. Usually, the core is pressed according to the position of the pole ear to press the pole ear flat. And the two ends of the core in the length direction after cold pressing, the perpendicular direction to the axis of the length direction of the core are the two sides of the core, and the distance from the positive pole ear to the same side is the positive pole ear to edge distance d1, and the distance from the negative pole ear to the same side is the negative pole ear to edge distance d2.

[0041] Figure 3 In the embodiment shown, the left side of the positive electrode ear is selected as the reference position, and the distance to the left side of the winding core is recorded as the positive electrode ear's edge distance d1, and the left side of the negative electrode ear is selected as the reference position, and the distance to the left side of the winding core is recorded as the negative electrode ear's edge distance d2. For this, according to actual needs, any position on the electrode ear can be selected as the reference position, and the distance from the reference position to the same side is used as the electrode ear's edge distance. There is no need to use the distance from the positive electrode ear to the left side of the winding core as the positive electrode ear's edge distance, and the distance from the negative electrode ear to the left side of the winding core as the negative electrode ear's edge distance. Only the distance from all positive electrode ears or all negative electrode ears to the same side is used as the electrode ear's edge distance, and no excessive restrictions are imposed on this.

[0042] Among them, the specific calculation method of the distance from the pole ear to the edge can be referred to as follows:

[0043] First, you can select the previous position of the winding needle as the zero position, such as the horizontal line of the winding core unloading position, such as Figure 4 It should be noted that, in actual applications, according to the rotation direction of the winding needle, the pole piece starts to be wound only after passing the tangent point with the winding needle. Therefore, in this embodiment, the tangent point between the pole piece and the winding needle is used 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 tangent point position between the pole piece and the winding needle.

[0044] At the same time, the photoelectric sensor is set 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 tangent point between the pole piece and the winding needle, recorded as D; and the tangent point between the pole piece and the winding needle is used as the timing zero point t0.

[0045] When the first side of the first positive electrode ear passes the photoelectric sensor, the first moment t1 is collected. At this time, the positive electrode sheet has been wound on the winding needle, and the winding length is the arc length corresponding to the rotation angle of the winding needle from t0 to t1.

[0046] Therefore, the winding arc length of the positive electrode sheet l1=(t1-t0)*W*R,

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

[0048] When the second side of the first positive electrode ear passes the photoelectric sensor, the second moment t2 is collected, and the time from t1 to t2 is the length of the first positive electrode ear, which corresponds to the arc length of the positive electrode sheet wound on the winding needle.

[0049] Therefore, the arc length of the positive electrode ear l2 = (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 sum of the arc length l2 of the positive electrode ear, that is, the length from the second side of the first positive electrode ear to the head end of the electrode sheet, and then according to the entry position of the electrode sheet, that is, the position of the intersection of the electrode sheet and the winding needle and the circumference of the winding needle, the position of the first positive electrode ear can be obtained.

[0051] Furthermore, the second moment t2 of the first positive ear is used as the timing zero point of the next positive ear to calculate the length from the second side of the second positive ear to the second side of the first positive ear, and then the position of the second positive ear can be calculated according to the position of the first positive ear, the circumference of the winding needle, and the thickness of the positive electrode sheet.

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

[0053] At the same time, after calculating the position of the first positive electrode ear, the radius of the winding needle begins to increase. Therefore, before calculating the winding arc length l1 of the positive electrode sheet corresponding to the second positive electrode ear, the size of the rotation angle from t0 to t1 and the sum of the angles corresponding to the arc length from the first positive electrode ear to the head end of the electrode sheet can be used to determine whether it is greater than 360 degrees. If it is greater than 360 degrees, the size of the rotation angle from t0 to t1 of the second positive electrode ear can be disassembled, and the sum of the thickness of the positive electrode sheet and the radius of the winding needle can be used as the new radius of the winding needle, so as to calculate the winding arc length l1 of the positive electrode sheet corresponding to the second positive electrode ear; if it is less than or equal to 360 degrees, the same method can be used for the arc length of the positive electrode ear corresponding to the second positive electrode ear, and finally the length from the second side of the second positive electrode ear to the second side of the first positive electrode ear is obtained, and then the position of the second positive electrode ear can be obtained by calculating the circumference of the winding needle based on the position of the first positive electrode ear and the new radius of the winding needle.

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

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

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

[0057] After calculating the distance to the edge of all positive ears on the winding core, and the distance to the edge of all negative ears, the positive electrode error and negative electrode error of the winding core, as well as the misalignment of the positive ear and the misalignment of the negative ear can be further calculated. Specifically, the distance to the edge of the first positive ear of the winding core, that is, the innermost positive ear, is used as a reference, and the distance to the edge of each remaining positive ear is compared with the distance to the edge of the innermost positive ear, that is, the difference is made, and the misalignment of each remaining positive ear can be obtained. In a specific embodiment, if the difference is a positive value, the positive ear is offset to the right, and if the difference is a negative value, the positive ear is offset to the left, and the absolute value of the difference reflects the misalignment of the positive ear. Further, the maximum value of the misalignment of all positive ears is used as the positive error of the winding core. Similarly, the misalignment of all negative ears and the negative error of the winding core are obtained.

[0058] The control unit 42 determines whether it is necessary to correct the next positive electrode sheet and negative electrode sheet to be wound based on the positive electrode error and negative electrode error of the wound core obtained as described above, as well as the misalignment of all positive electrode ears and the misalignment of all negative electrode ears, so as to reduce the misalignment of the positive electrode ears and negative electrode ears in the next positive electrode sheet and negative electrode sheet to be wound, and avoid scrapping the core.

[0059] Specifically, a judgment is made based on the positive pole error of the winding core and the allowable value of the positive pole error of the standard winding core, as well as the negative pole error of the winding core and the allowable value of the negative pole error of the standard winding core: if the positive electrode sheet and / or negative electrode sheet to be wound needs to be corrected, the number of positive pole ears that need to be corrected is counted according to the misalignment of the positive pole ears, and the number of negative pole ears that need to be corrected is counted according to the misalignment of the negative pole ears, and the laser die-cutting unit in the die-cutting module 20 and the embossing roller unit in the embossing module 30 are controlled to work accordingly to reduce the offset and misalignment of the pole ears; if no correction is required, the error of the next winding core and the misalignment of the pole ears are continuously detected.

[0060] In a specific embodiment, since the positive electrode sheet and the negative electrode sheet need to be processed separately, the laser die-cutting unit includes a positive electrode laser die-cutting subunit 21 and a negative electrode laser die-cutting subunit 22, which are respectively used to cut the positive electrode ears from the positive electrode sheet to be wound, and to cut the negative electrode ears from the negative electrode sheet to be wound, so as to adjust the spacing between the positive electrode ears and the spacing between the negative electrode ears. The embossing roller unit includes a positive electrode embossing subunit and a negative electrode embossing subunit, which are respectively used to construct embossing areas on the positive electrode sheet to be wound and the negative electrode sheet to adjust the thickness of the positive electrode sheet and the thickness of the negative electrode sheet.

[0061] In addition, the correction module 40 also includes a verification unit 43, which is used to collect the actual positive electrode error and the actual negative electrode error of the core after cold pressing, as well as the actual distance to the edge of the innermost positive ear and the actual distance to the edge of the innermost negative ear. The control unit 42 identifies whether the deviation is too large based on the data collected by the verification unit 43, as well as the calculated positive electrode error and negative electrode error of the core, the distance to the edge of the innermost positive ear and the distance to the edge of the innermost negative ear. In practical applications, the verification unit 43 mostly uses a CCD camera, which can accurately collect the actual misalignment of the ear, and use the maximum value 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 fluctuations. In order to avoid affecting the detection of the misalignment of the ear, by comparing the data collected by the CCD camera 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 correspondingly optimized to improve the reliability of the system and reduce the frequency of manual intervention.

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

[0063] Example 2

[0064] See also Figure 5 As shown, this embodiment also provides a calibration method for a core winding system, comprising:

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

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

[0067] Step S300, comparing the distance from the innermost tab of the winding core to the edge with the distance from each of the remaining tabs to the edge, obtaining the misalignment amount corresponding to each of the remaining tabs, and taking the maximum value of all the misalignment amounts as the error of the winding core.

[0068] Step S400: judging whether it is necessary to calibrate the pole piece to be wound according to the error of the winding core and the allowable error value of the standard winding core.

[0069] Among them, by collecting the first moment and the second moment of each positive ear, and the first moment and the second moment of each negative ear, the distance to the edge of all positive ears and the distance to the edge of all negative ears are calculated accordingly. Based on the distance to the edge of the positive ear and the distance to the edge of the negative ear, the positive electrode error and the negative electrode error of the winding core, as well as the misalignment of the positive ear and the misalignment of the negative ear are obtained to determine whether the next positive and negative sheets to be wound need to be corrected.

[0070] However, before judging whether the next positive electrode sheet and negative electrode sheet to be wound needs to be corrected, it is also possible to judge whether the entry position of the positive electrode sheet and negative electrode sheet to be wound needs to be adjusted based on the edge distance of the innermost positive electrode ear and the edge distance of the innermost negative electrode ear, so as to avoid serious influence of the entry position on the misalignment of the electrode ears.

[0071] Specifically, calculate the difference between the distance to the edge of the innermost positive pole ear and the distance to the edge of the positive pole ear of the standard core. If the difference is greater than half of the allowable error value of the standard core, adjust the entry position of the next positive electrode sheet to be wound to avoid the entry position of the electrode sheet affecting the ear, and detect whether the next core repeats this situation. When the next core returns to normal, the misalignment correction of the pole ear of the core can continue. When the above situation occurs for three consecutive cores, the winding module of the core may fail, and the staff should be reminded to perform maintenance in time to reduce the scrapping of materials in the core. If the difference is less than or equal to half of the allowable error value of the standard core, no adjustment is required, and the misalignment correction of the pole ear of the core continues.

[0072] In a specific embodiment, it is determined whether the pole piece to be wound needs to be corrected based on the error of the winding core and the allowable error value of the standard winding core:

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

[0074] When the positive electrode error of the winding core is greater than the allowable positive electrode error value of the standard winding core, the number of positive electrode ears that need to be corrected is counted according to the misalignment of the positive electrode ears, so as to correct the positive electrode sheet to be wound.

[0075] When the negative electrode error of the winding core is greater than the allowable value of the negative electrode error of the standard winding core, the number of negative electrode ears that need to be corrected is counted according to the misalignment of the negative electrode ears, so as to correct the negative electrode sheet to be wound.

[0076] Among them, in order to avoid contingency, when the positive pole error of the core is greater than the allowable value of the positive pole error of the standard core, or the negative pole error of the core is greater than the allowable value of the negative pole error of the standard core, the next group of positive and negative electrode sheets will continue to be wound, and the error of the core and the misalignment of the tabs will be re-checked after the winding is completed. If the error of the core is still greater than the allowable value of the error of the standard core, the positive or negative electrode sheet to be wound needs to be corrected; if the error of the core returns to normal, it means that other factors may have caused the abnormality of the previous group of windings, and no correction is needed for the time being, which greatly improves the reliability of the correction.

[0077] Specifically, when the positive electrode error of the winding core is greater than the allowable positive electrode error value of the standard winding core, the positive electrode ears whose misalignment amounts are greater than half of the allowable positive electrode error value of the standard winding core are taken as the positive electrode ears that need to be corrected, and the number of positive electrode ears that need to be corrected is accumulated.

[0078] Furthermore, the positive electrode laser die-cutting subunit and the positive electrode embossing subunit are controlled to work accordingly according to the number of positive electrode ears that need to be corrected:

[0079] When the number of positive electrode ears that need to be corrected is greater than or equal to half of the number of all positive electrode ears except the innermost positive electrode ears in the core, the positive electrode laser die-cutting sub-unit adjusts the spacing between the positive electrode ears on the positive electrode sheet to be wound, thereby adjusting the misalignment of the positive electrode ears in the core.

[0080] When the number of positive electrode ears that need to be corrected is less than half of the number of all positive electrode ears except the innermost positive electrode ears in the winding core, the thickness of the positive electrode sheet to be wound is adjusted accordingly by the positive electrode embossing sub-unit, thereby adjusting the misalignment of the positive electrode ears of the winding core.

[0081] Accordingly, to avoid contingency, when the number of positive electrode ears that need to be corrected is greater than or equal to half of the number of all positive electrode ears except the innermost positive electrode ears in the roll core, or when the number of positive electrode ears that need to be corrected is less than half of the number of all positive electrode ears except the innermost positive electrode ears in the roll core, it is detected whether the situation is repeated in the next group, and after the situation is repeated, adjustments are made through the positive electrode laser die-cutting sub-unit or the positive electrode embossing sub-unit.

[0082] Similarly, the number of negative pole ears that need to be corrected is counted, and the negative pole laser die-cutting subunit and the negative pole embossing subunit are controlled to work accordingly according to the number of negative pole ears that need to be corrected:

[0083] When the number of negative electrode ears that need to be corrected is greater than or equal to half of the number of all negative electrode ears except the innermost layer of negative electrode ears in the winding core, the spacing between the negative electrode ears on the negative electrode sheet to be wound is adjusted accordingly by the negative electrode laser die-cutting sub-unit, thereby adjusting the misalignment of the negative electrode ears in the winding core.

[0084] When the number of negative electrode ears that need to be corrected is less than half of the number of all negative electrode ears except the innermost negative electrode ears in the winding core, the thickness of the negative electrode sheet to be wound is adjusted accordingly by the negative electrode embossing sub-unit, thereby adjusting the misalignment of the positive electrode ears of the winding core.

[0085] Accordingly, to avoid contingency, when the number of negative electrode ears that need to be corrected is greater than or equal to half of the number of all negative electrode ears except the innermost negative electrode ears in the winding core, or when the number of negative electrode ears that need to be corrected is less than half of the number of all negative electrode ears except the innermost negative electrode ears in the winding core, it is detected whether the situation is repeated in the next group, and after the situation is repeated, adjustments are made through the negative electrode laser die-cutting sub-unit or the negative electrode embossing sub-unit.

[0086] It should be noted that the above-mentioned adjustment of the spacing between the pole ears and the thickness of the pole piece can also be replaced by other methods. For example, changing the winding diameter of the winding needle can replace the adjustment of the spacing between the pole ears. In actual use, it can be selected according to the needs of the product. The modifications and embellishments made to the embodiments of the present invention by those skilled in the art without departing from the spirit of the present invention still fall within the scope of the invention patent application of the present invention.

[0087] In addition, it also includes: detecting the actual error of three consecutive cold-pressed core windings and the actual distance to the edge of the innermost pole ear through a verification unit, and optimizing the position of the detection unit and the pole ear, the distance to the edge of the pole ear, and the calculation method of the error of the core winding and the misalignment of the pole ear based on the calculated corresponding error of the core winding and the distance to the edge of the innermost pole ear.

[0088] Specifically, the difference between the actual positive electrode error and the corresponding positive electrode error of each winding core 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 electrode error of the winding core, the calculation method of the positive electrode error of the winding core is compensated;

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

[0090] Calculate the difference between the actual distance to the edge of the innermost positive ear of each winding core and the corresponding distance to the edge, and obtain three difference values ​​c1, c2, and c3. If the three differences c1, c2, and c3 are all greater than 5% of the distance to the edge of the innermost positive ear of the winding core, then compensate for the calculation method of the distance to the edge of the innermost positive ear of the winding core.

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

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

[0093] Among them, the preset first threshold value uses 5% of the error of the winding core, and the preset second threshold value uses 5% of the distance from the innermost pole ear to the edge as only a preferred embodiment, which can be selected according to actual conditions, and the percentage can also be adjusted. Without departing from the spirit of the present invention, the modifications and embellishments made to the embodiments of the present invention by those skilled in the art still fall within the scope of the invention patent application of the present invention.

[0094] It should be noted that the step division of the above methods is only for clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they contain the same logical relationship, they are all within the scope of protection of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs without changing the core design of the algorithm and process are all within the scope of protection of this patent.

[0095] In summary, the present invention provides a correction method for the misalignment of the tabs, which can detect whether the tabs are misaligned in the winding core after winding is completed, and correct the positive and negative electrodes to be wound after the misalignment exceeds the allowable value, thereby greatly reducing the scrap of materials in the winding core. At the same time, the appropriate correction method can be automatically selected for adjustment according to the size of the misalignment of the tabs, with a faster response speed and without affecting the normal production of the core. In addition, the misalignment data of the tabs can be secondary verified by a CCD camera, and the photoelectric sensor for collecting the 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 manual input.

[0096] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A core winding system, characterized in that: include: A winding module, comprising a winding needle, wherein the winding needle is used to wind the pole piece and the diaphragm to form a winding core; A die-cutting module, including a laser die-cutting unit, for die-cutting a pole ear at the edge of the pole piece; An embossing module, comprising an embossing roller unit, for constructing an embossed area on the pole piece; A correction module, comprising a detection unit and a control unit, wherein the detection unit is used to collect the first moment and the second moment when the two opposite sides of the pole ear pass through a certain point respectively during the winding process, and output the collected data to the control unit; The control unit calculates the distance from the pole ear to the edge 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 control unit also calculates the error of the corresponding winding core and the misalignment of the pole ear according to the distances from the edges of all the pole ears; the distance from the edge of the pole ear is the distance from the pole ear to the side of the winding core after cold pressing; The control unit is also used to determine whether to correct the pole piece to be wound based on the error of the winding core, and to control the laser die-cutting unit and the embossing roller unit to work accordingly according to the misalignment amount of the pole ear.

2. The core winding system according to claim 1, characterized in that: Also includes: The cold pressing module is used to press the core into a preset shape.

3. The core winding system according to claim 1, characterized in that: The correction module also includes: The verification unit is used to collect the actual error of the winding core after cold pressing and the actual distance from the innermost tab to the edge, and output the collected data to the control unit.

4. The core winding system according to claim 3, characterized in that: The control unit is also used to optimize its own calculation program and the working parameters of the detection unit according to the data collected by the verification unit, the calculated error of the winding core, and the distance from the innermost pole ear to the edge.

5. The core winding system according to claim 1, characterized in that: The detection unit includes a positive electrode detection subunit and a negative electrode detection subunit, which are respectively used to collect the first moment and the second moment when the positive electrode ear and the negative electrode ear pass through the corresponding fixed point; The laser die-cutting unit comprises a positive electrode laser die-cutting sub-unit and a negative electrode laser die-cutting sub-unit, which are used to cut out positive electrode ears on the positive electrode sheet and cut out negative electrode ears on the negative electrode sheet respectively; The embossing roller unit comprises a positive electrode embossing sub-unit and a negative electrode embossing sub-unit, which are used to construct embossing areas on the positive electrode sheet and the negative electrode sheet respectively.

6. The core winding system according to claim 5, characterized in that: The control unit calculates the positive electrode error of the corresponding winding core and the misalignment amount of the positive electrode ear according to the data collected by the positive electrode 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 electrode sheet; The control unit also calculates the negative electrode error of the corresponding winding core and the misalignment of the negative electrode ear according to the data collected by the negative electrode 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 electrode sheet; The error of the winding core includes a positive electrode error and a negative electrode error, and the misalignment of the tabs includes a misalignment of the positive tab and a misalignment of the negative tab.

7. The core winding system according to claim 6, characterized in that: The control unit determines whether to correct the positive electrode sheet to be wound based on the positive electrode error of the winding core, and counts the number of positive electrode ears that need to be corrected according to the misalignment of the positive electrode ears, and controls the positive electrode laser die-cutting subunit and the positive electrode embossing subunit to work accordingly; The control unit also determines whether to correct the negative electrode sheet to be wound based on the negative electrode error of the winding core, and counts the number of negative electrode ears that need to be corrected according to the misalignment of the negative electrode ears, and controls the negative electrode laser die-cutting subunit and the negative electrode embossing subunit to work accordingly.

8. A method for calibrating a core winding system, characterized in that: include: During the winding process of the pole piece, the detection unit collects the first moment and the second moment when the two sides of each pole ear pass through a certain point, and calculates the position of each pole ear on the winding core according to the timing zero point and the entry position of the corresponding pole piece; Preprocessing the positions of all the tabs to obtain the distance from each tab to the edge; Compare the distance from the innermost tab of the winding core to the edge with the distance from each of the remaining tabs to the edge, obtain the misalignment amount corresponding to each of the remaining tabs, and take the maximum value of all the misalignment amounts as the error of the winding core; Based on the error of the winding core and the allowable error value of the standard winding core, it is determined whether the pole piece to be wound needs to be corrected.

9. The method for calibrating a core winding system according to claim 8, characterized in that: The step of collecting the first moment and the second moment when the two sides of each pole ear pass through a certain point respectively through the detection unit during the pole piece winding process, and calculating the position of each pole ear on the winding core according to the timing zero point and the entry position of the corresponding pole piece includes: The first moment when one side of the positive electrode ear passes through the corresponding fixed point and the first moment when one side of the negative electrode ear passes through the corresponding fixed point are respectively collected; According to the angular velocity of the winding needle, the phase angle of the winding needle between the timing zero point and the first moment is calculated and converted into the winding arc length of the electrode sheet, and the winding arc length of the positive electrode sheet and the winding arc length of the negative electrode sheet are obtained respectively; The second moment when the other side of the positive electrode ear passes the corresponding fixed point and the other side of the negative electrode ear are collected respectively. After the second moment of the corresponding fixed point, the corresponding second moment is respectively used as the new timing zero point; According to the angular velocity of the winding needle, the phase angle of the winding needle between the first moment and the second moment is calculated and converted into the arc length of the pole ear, and the arc length of the positive pole ear and the arc length of the negative pole ear are obtained respectively; The position of the positive electrode ear is calculated based on the distance from the corresponding fixed point to the winding needle and the entry position of the positive electrode sheet, or the position of the previous positive electrode ear, as well as the winding arc length of the positive electrode sheet and the arc length of the positive electrode ear; and the position of the negative electrode ear is calculated based on the distance from the corresponding fixed point to the winding needle and the entry position of the negative electrode sheet, or the position of the previous negative electrode ear, as well as the winding arc length of the negative electrode sheet and the arc length of the negative electrode ear; the positions of the electrode ears include the positions of the positive electrode ears and the negative electrode ears.

10. The method for calibrating a core winding system according to claim 8, characterized in that: The step of preprocessing the positions of all the tabs to obtain the distance to the edge of each tab comprises: According to the position of the pole ear and the compensation parameters of the winding core after cold pressing, the distance to the edge of the positive pole ear and the distance to the edge of the negative pole ear are calculated respectively; the distance to the edge of the pole ear includes the distance to the edge of the positive pole ear and the distance to the edge of the negative pole ear.

11. The method for calibrating a core winding system according to claim 8, characterized in that: The step of comparing the distance from the innermost tab to the edge of the winding core with the distance from the edge of each of the remaining tabs to obtain the misalignment amount corresponding to each of the remaining tabs, and taking the maximum value of all the misalignment amounts as the error of the winding core includes: The difference between the distance to the edge of each remaining positive electrode ear and the distance to the edge of the innermost positive electrode ear is used as the misalignment amount of the corresponding positive electrode ear, and the maximum value of the misalignment amounts of all the positive electrode ears is used as the positive electrode error of the winding core; The difference between the distance to the edge of each remaining negative electrode ear and the distance to the edge of the innermost negative electrode ear is used as the misalignment amount of the corresponding negative electrode ear, and the maximum value of the misalignment amounts of all the negative electrode ears is used as the negative electrode error of the winding core; The error of the winding core includes a positive electrode error and a negative electrode error, and the misalignment of the tabs includes a misalignment of the positive tab and a misalignment of the negative tab.

12. The method for calibrating a core winding system according to claim 8, characterized in that: Before judging whether it is necessary to correct the pole piece to be wound according to the error of the winding core and the allowable error value of the standard winding core, the method further includes: According to the distance from the innermost electrode ear to the edge, it is determined whether the entry position of the electrode sheet to be wound needs to be adjusted.

13. The method for calibrating a core winding system according to claim 12, characterized in that: The step of judging whether it is necessary to adjust the entry position of the electrode sheet to be wound according to the distance from the innermost electrode ear to the edge comprises: Calculate the difference between the distance from the innermost tab to the edge and the distance from the tab to the edge corresponding to the standard winding core: If the difference is greater than half of the allowable error value corresponding to the standard winding core, the entry position of the electrode to be wound is adjusted accordingly; Otherwise no adjustment is required.

14. The method for calibrating a core winding system according to claim 8, characterized in that: The step of judging whether the pole piece to be wound needs to be corrected based on the error of the winding core and the allowable error value of the standard winding core includes: When the positive electrode error of the winding core is less than the positive electrode error allowable value of the standard winding core, and the negative electrode error of the winding core is less than the negative electrode error allowable value of the standard winding 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 pole tabs that need to be corrected of the winding core is counted according to the misalignment amount of the pole tabs, and the pole pieces to be wound are corrected according to the next group of winding cores; The error of the winding core includes a positive pole error and a negative pole error, and the allowable error value of the standard winding core includes a positive pole error allowable value and a negative pole error allowable value.

15. The method for calibrating a core winding system according to claim 14, characterized in that: The step of counting the number of pole tabs that need to be corrected on the winding core according to the misalignment amount of the pole tabs, and correcting the pole pieces to be wound according to the next group of winding cores includes: The positive pole ears whose misalignment is greater than half of the allowable value of the positive pole error among all the positive pole ears are regarded as the positive pole ears that need to be corrected, and the negative pole ears whose misalignment is greater than half of the allowable value of the negative pole error among all the negative pole ears are regarded as the negative pole ears that need to be corrected, and the number of positive pole ears and the number of negative pole ears that need to be corrected are accumulated to obtain: When the number of positive electrode tabs that need to be corrected is greater than or equal to half of the number of all positive electrode tabs except the innermost positive electrode tabs of the corresponding winding core, and this situation occurs repeatedly in the next group of winding cores, the spacing between the positive electrode tabs on the positive electrode sheet to be wound is correspondingly adjusted by the positive electrode laser die-cutting sub-unit; When the number of positive electrode tabs that need to be corrected is less than half of the number of all positive electrode tabs except the innermost positive electrode tab of the corresponding winding core, and this situation occurs repeatedly in the next group of winding cores, the thickness of the positive electrode sheet to be wound is correspondingly adjusted by the positive electrode embossing sub-unit; When the number of negative electrode ears that need to be corrected is greater than or equal to half of the number of all negative electrode ears except the innermost negative electrode ears of the corresponding winding core, and this situation occurs repeatedly in the next group of winding cores, the spacing between the negative electrode ears on the negative electrode sheet to be wound is correspondingly adjusted by the negative electrode laser die-cutting subunit; When the number of negative electrode ears that need to be corrected is less than half of the number of all negative electrode ears except the innermost negative electrode ears of the corresponding winding core, and this situation occurs repeatedly in the next group of winding cores, the thickness of the negative electrode sheet to be wound is correspondingly adjusted by the negative electrode embossing sub-unit; The misalignment amount of the tabs includes the misalignment amount of the positive tabs and the misalignment amount of the negative tabs, and the number of tabs that need to be corrected includes the number of positive tabs that need to be corrected and the number of negative tabs that need to be corrected.

16. The method for calibrating a core winding system according to claim 8, characterized in that: Also includes: The actual error of the winding core after three consecutive cold pressing and the actual distance to the edge of the innermost lug are detected by the verification unit, and based on the calculated corresponding error of the winding core and the distance to the edge of the innermost lug, the position of the detection unit and the lug, the distance to the edge of the lug, and the calculation method of the error of the winding core and the misalignment of the lug are optimized.

17. The method for calibrating a core winding system according to claim 16, characterized in that: The step of detecting the actual error of three consecutive cold-pressed core windings and the actual distance from the innermost tab to the edge by a verification unit, and optimizing the position of the detection unit and the tab, the distance from the tab to the edge, and the calculation method of the error of the core winding and the misalignment of the tab according to the calculated corresponding error of the core winding and the distance from the innermost tab to the edge includes: Calculate the difference between the actual error and the corresponding error of each winding core, as well as the difference between the actual distance to the edge and the corresponding distance to the edge of the innermost tab, and compare them with the corresponding preset thresholds respectively; If the difference between the actual error and the corresponding error of the three winding cores is greater than the preset first threshold, or the difference between the actual distance to the edge and the corresponding distance to the edge of the innermost tab of the three winding cores is greater than the preset second threshold, the working parameters of the detection unit and the position of the tab, the distance to the edge of the tab, and the calculation method of the error of the winding core and the misalignment of the tab are compensated.

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