Pole piece thickness measuring method and system

Abstract

The invention discloses a pole piece thickness measuring method and system, and the method comprises the steps: recording a first rotation angle of a passing roller on which a first pole piece is placed through an encoder, and transmitting the first rotation angle to a processor; under the condition that the passing roller is located at the first rotating angle, the first thickness of a pole piece area, located on the passing roller, of the first pole piece is measured through a thickness gauge, and the first thickness is sent to a processor; a first thickness compensation coefficient corresponding to the first rotation angle is determined through the processor based on a preset corresponding relation, the first thickness is compensated based on the first thickness compensation coefficient, the target thickness of the pole piece area is obtained, and the preset corresponding relation comprises the corresponding relation between the rotation angle calibrated in advance and the thickness compensation coefficient. Therefore, the accuracy of pole piece thickness measurement can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method and system for measuring electrode thickness. Background Technology

[0002] With the development of battery technology, users have increasingly higher requirements for battery quality.

[0003] In the battery production process, the thickness of the electrode sheet needs to be measured in processes such as coating, cold pressing, slitting, die cutting, and winding. If the thickness of the electrode sheet is not measured accurately, it may lead to misalignment of the electrode tabs, causing safety hazards.

[0004] Therefore, in order to avoid electrode misalignment and improve safety, a solution that can accurately measure electrode thickness is needed. Summary of the Invention

[0005] This application provides a method, system, and apparatus for measuring electrode thickness, which can achieve accurate measurement of electrode thickness.

[0006] In a first aspect, this application provides a method for measuring electrode thickness. The method includes: recording a first rotation angle of a roller on which a first electrode is placed using an encoder, and sending the first rotation angle to a processor; measuring the first thickness of the electrode region on the roller using a thickness gauge when the roller is at the first rotation angle, and sending the first thickness to the processor; determining a first thickness compensation coefficient corresponding to the first rotation angle using a processor based on a preset correspondence, and compensating the first thickness based on the first thickness compensation coefficient to obtain a target thickness of the electrode region. The preset correspondence includes a pre-calibrated correspondence between the rotation angle and the thickness compensation coefficient.

[0007] Therefore, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle can be determined. Then, based on the first thickness compensation coefficient, the first thickness of the electrode region on the roller in the first electrode sheet is compensated when the roller is located at the first rotation angle. In this way, if there is circular runout of the roller, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle of the roller can be determined. This allows for targeted circular runout compensation, avoiding inaccurate electrode sheet thickness measurement caused by roller runout, thereby improving the accuracy of electrode sheet thickness measurement and preventing electrode tab misalignment caused by inaccurate electrode sheet thickness measurement, which could lead to safety issues.

[0008] In some embodiments, the preset correspondence includes the correspondence between multiple target rotation angles and their respective thickness compensation coefficients. The preset correspondence is obtained by the following method: the processor obtains the second thickness corresponding to each of the multiple target rotation angles. The second thickness corresponding to the target rotation angle is measured when the roller without the electrode is at the target rotation angle. All multiple target rotation angles are greater than or equal to 0° and less than 360°. The processor obtains the third thickness corresponding to each of the multiple target rotation angles. The third thickness corresponding to the target rotation angle is measured when the roller with the second electrode is at the target rotation angle. For each of the multiple target rotation angles, the processor determines the thickness compensation coefficient corresponding to the target rotation angle based on the fourth thickness of the second electrode, the second thickness corresponding to the target rotation angle, and the third thickness corresponding to the target rotation angle, thus obtaining the preset correspondence.

[0009] In this way, through the above process, the thickness compensation coefficients corresponding to multiple target rotation angles can be accurately calibrated, that is, the preset correspondence can be used to compensate for the thickness measurement values ​​corresponding to different rotation angles when measuring the electrode thickness.

[0010] In some embodiments, before obtaining the second thickness corresponding to the multiple target rotation angles by the processor, the method further includes: recording multiple target rotation angles of the roller without electrode plates by an encoder and sending the multiple target rotation angles to the processor; for each of the multiple target rotation angles, when the roller is located at the target rotation angle, measuring the second thickness of the roller without electrode plates by a thickness gauge and sending the second thickness to the processor; and determining the second thickness corresponding to the multiple target rotation angles by the processor.

[0011] In this way, by recording the rotation angle of the roller with an encoder, measuring the thickness of the roller without electrode plates with a thickness gauge, and then matching multiple target rotation angles with multiple second thicknesses with a processor, the second thickness corresponding to each of the multiple target rotation angles can be accurately determined.

[0012] In some embodiments, determining the second thickness corresponding to multiple target rotation angles by a processor includes: acquiring multiple preset rotation angles arranged in a target order by a processor, wherein all preset rotation angles are greater than or equal to 0° and less than 360°; acquiring the second rotation angle of the roller by a processor; determining the second rotation angle as the target rotation angle by a processor when the second rotation angle is greater than the first preset rotation angle and less than or equal to the second preset rotation angle, and determining the second thickness corresponding to the target rotation angle, wherein the first preset rotation angle is less than the second preset rotation angle, and the first preset rotation angle and the second preset rotation angle are two adjacent preset rotation angles among the multiple preset rotation angles; updating the first preset rotation angle to the second preset rotation angle by a processor, updating the second preset rotation angle to the third preset rotation angle by a processor, and returning to the process of acquiring the second rotation angle of the roller by a processor until the number of target rotation angles reaches a first threshold, thereby obtaining the second thickness corresponding to multiple target rotation angles, wherein the second preset rotation angle is less than the third preset rotation angle, and the second preset rotation angle and the third preset rotation angle are two adjacent preset rotation angles among the multiple preset rotation angles.

[0013] Thus, through the above process, the thickness of the roller without electrode plates at multiple target rotation angles can be automatically calibrated without manual calibration, which is highly efficient and accurate. Furthermore, the target rotation angles to be calibrated can be reasonably selected to avoid calibrating angles that are too close together, thus avoiding wasting computing resources.

[0014] In some embodiments, after obtaining the second rotation angle of the roller through the processor, the method further includes: determining, through the processor, the duration for which the second rotation angle is less than the first preset rotation angle; and, if the duration is greater than a second threshold, outputting a first prompt message through the processor, the first prompt message being used to indicate that the roller has a rotational abnormality.

[0015] Thus, through the above process, when the rollers rotate abnormally, a first prompt message can be output to indicate that the rollers are rotating abnormally, so that users can promptly detect the abnormality and take appropriate measures.

[0016] In some embodiments, the method further includes: acquiring thickness data measured by a thickness gauge in response to an input to start a calibration program via a processor; determining whether an electrode sheet is placed on the roller based on the thickness data via a processor; and calibrating a preset correspondence if no electrode sheet is placed on the roller.

[0017] Thus, through the above process, the user can flexibly control whether to perform the calibration of the preset correspondence, and can automatically determine whether there are electrode sheets on the roller. If it is determined that there are no electrode sheets on the roller, the calibration of the preset correspondence will begin, thus avoiding the impact on normal production due to the start of the calibration program.

[0018] In some embodiments, the method further includes: when an electrode sheet is placed on the roller, outputting a second prompt message through a processor, the second prompt message being used to prompt the removal of the electrode sheet placed on the roller.

[0019] Thus, by outputting a second prompt message when an electrode is placed on the roller, prompting the user to remove the electrode placed on the roller, the user can promptly detect and remove the electrode if it is not removed, thus avoiding affecting the calibration of the preset correspondence.

[0020] In some embodiments, before obtaining the third thickness corresponding to the multiple target rotation angles through the processor, the method further includes: recording multiple target rotation angles of the roller on which the second electrode is placed through an encoder, and sending the multiple target rotation angles to the processor; for each of the multiple target rotation angles, when the roller is located at the target rotation angle, measuring the third thickness of the roller on which the second electrode is placed through a thickness gauge, and sending the third thickness to the processor; and determining the third thickness corresponding to the multiple target rotation angles through the processor.

[0021] In this way, by recording the rotation angle of the roller by the encoder, measuring the thickness of the roller on which the second pole piece is placed by the thickness gauge, and then matching the multiple target rotation angles with the multiple third thicknesses by the processor, the third thicknesses corresponding to the multiple target rotation angles can be accurately determined.

[0022] In some embodiments, after determining the thickness compensation coefficient corresponding to the target rotation angle, the method further includes: determining the range of the second thickness corresponding to the multiple target rotation angles by a processor; for each thickness compensation coefficient among the multiple target rotation angles, determining the circular runout value of the roller based on the thickness compensation coefficient and the range by a processor to obtain multiple circular runout values; if any circular runout value among the multiple circular runout values ​​is greater than a third threshold, outputting a third prompt message by a processor, the third prompt message being used to indicate that the roller has a circular runout abnormality.

[0023] In this way, by calculating the circular runout value, it is possible to accurately determine whether there is an abnormality in the circular runout of the roller. When an abnormality in the circular runout of the roller occurs, a third prompt message is output to indicate that an abnormality has occurred, so that users can detect the abnormality in time and take corresponding measures.

[0024] In some embodiments, the method further includes: recalibrating the preset correspondence of the rollers when the electrode sheet placed on the roller travels a preset length.

[0025] In this way, through the above process, the preset correspondence can be recalibrated after the rollers have worn to a certain extent, thus avoiding inaccurate electrode thickness measurement due to roller wear.

[0026] In some embodiments, the method further includes: receiving a third rotation angle of the roller on which the first electrode is placed by a processor, wherein the time interval between the time corresponding to the third rotation angle and the time corresponding to the first rotation angle is a preset time interval; the above-mentioned determining a first thickness compensation coefficient corresponding to the first rotation angle by the processor based on a preset correspondence, and compensating the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode region includes: when the difference between the first rotation angle and the third rotation angle is greater than or equal to a fourth threshold, determining a first thickness compensation coefficient corresponding to the first rotation angle by the processor based on a preset correspondence, and compensating the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode region.

[0027] Thus, through the above process, electrode thickness measurement can be performed only when the roller is confirmed to be rotating normally with the electrode belt, avoiding inaccurate electrode thickness measurement due to abnormal roller rotation.

[0028] In some embodiments, the method further includes: if the difference between the first rotation angle and the third rotation angle is less than a fourth threshold, outputting a fourth prompt message through the processor, the fourth prompt message being used to indicate that the roller has a rotational abnormality.

[0029] Thus, through the above process, a fourth prompt message can be output when the roller rotates abnormally, indicating that the roller has rotated abnormally, so that the user can detect the abnormality in time and take corresponding measures.

[0030] In some embodiments, the processor determines the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, including: when the first rotation angle is equal to a first target rotation angle among a plurality of target rotation angles, determining the thickness compensation coefficient corresponding to the first target rotation angle as the first thickness compensation coefficient corresponding to the first rotation angle; when the first rotation angle is not equal to any of the plurality of target rotation angles, determining the first thickness compensation coefficient corresponding to the first rotation angle based on the thickness compensation coefficient corresponding to the second target rotation angle, wherein the plurality of target rotation angles include the second target rotation angle, and the difference between the second target rotation angle and the first rotation angle is less than a fifth threshold.

[0031] Thus, through the above process, the first thickness compensation coefficient can be determined more reasonably when the first rotation angle is not equal to any target rotation angle, so as to accurately determine the electrode thickness.

[0032] Secondly, this application provides an electrode thickness measurement system, which includes: an encoder electrically connected to a processor, used to record a first rotation angle of a roller on which a first electrode is placed, and to send the first rotation angle to the processor; a thickness gauge electrically connected to the processor, used to measure the first thickness of the electrode region on the roller when the roller is at the first rotation angle, and to send the first thickness to the processor; and a processor used to determine a first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain a target thickness of the electrode region, wherein the preset correspondence includes a pre-calibrated correspondence between the rotation angle and the thickness compensation coefficient.

[0033] Therefore, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle can be determined. Then, based on the first thickness compensation coefficient, the first thickness of the electrode region on the roller in the first electrode sheet is compensated when the roller is located at the first rotation angle. In this way, if there is circular runout of the roller, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle of the roller can be determined. This allows for targeted circular runout compensation, avoiding inaccurate electrode sheet thickness measurement caused by roller runout, thereby improving the accuracy of electrode sheet thickness measurement and preventing electrode tab misalignment caused by inaccurate electrode sheet thickness measurement, which could lead to safety issues.

[0034] In some embodiments, the system further includes a drive member, mechanically connected to the roller, for driving the roller to rotate.

[0035] In this way, the roller can be driven to rotate by the drive component, so as to efficiently control the rotation of the roller and accurately control the rotation angle of the roller.

[0036] In some embodiments, the system includes a servo motor, which includes a driver and an encoder. The driver is electrically connected to the encoder, which is used to record the angle at which the driver drives the roller to rotate.

[0037] In this way, the rotation angle of the roller can be accurately recorded by driving the roller rotation with a servo motor.

[0038] In some embodiments, the driving element is a drive motor, which is electrically connected to an encoder. The encoder is used to record the angle at which the drive motor drives the roller to rotate.

[0039] In this way, by equipping an additional encoder, the rotation angle of the roller can be recorded even when the roller is driven by an active motor, thus enabling the measurement of electrode thickness using a low-cost active motor.

[0040] In some embodiments, the processor includes a lower-level machine, which is electrically connected to the encoder and the thickness gauge respectively; the lower-level machine is used to determine the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

[0041] In this way, the electrode thickness can be determined by receiving the first rotation angle sent by the encoder and the first thickness sent by the thickness gauge from the lower-level machine. The time delay is small, and the electrode thickness can be determined in a timely manner.

[0042] In some embodiments, the processor includes a host computer, and the system further includes a slave computer. The host computer and the slave computer are electrically connected, and the slave computer is electrically connected to an encoder and a thickness gauge, respectively. The slave computer is used to receive a first rotation angle sent by the encoder and a first thickness sent by the thickness gauge, and to send the first rotation angle and the first thickness to the host computer. The host computer is used to determine a first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate for the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

[0043] In this way, calculating the electrode thickness via the host computer avoids consuming resources of the slave computer, thereby preventing any impact on production.

[0044] In some embodiments, it is used in at least one of a coating system, a rolling system, a slitting system, a die-cutting system, and a winding system.

[0045] This improves the accuracy of electrode thickness measurement during coating, rolling, slitting, die-cutting, and winding processes.

[0046] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0048] Figure 1A schematic diagram of the structure of an electrode thickness measurement system provided in some embodiments of this application;

[0049] Figure 2 A schematic diagram of the installation position of a thickness gauge provided for some embodiments of this application;

[0050] Figure 3 A flowchart illustrating a method for measuring electrode thickness provided in some embodiments of this application;

[0051] Figure 4 A flowchart illustrating a predefined correspondence relationship provided for some embodiments of this application;

[0052] Figure 5 A flowchart illustrating a recalibration of a preset correspondence relationship is provided for some embodiments of this application;

[0053] Figure 6 This is a flowchart illustrating the measurement of electrode thickness for some embodiments of this application.

[0054] The accompanying drawings are not necessarily drawn to scale. Detailed Implementation

[0055] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0056] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0057] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0058] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0065] Currently, with the development of battery technology, users have increasingly higher requirements for battery quality.

[0066] The inventors of this application have noted that the thickness of the electrode sheet needs to be measured in processes such as coating, cold pressing, slitting, die-cutting, and winding during battery production. Inaccurate measurement of the electrode sheet thickness can lead to misalignment of the tabs, posing a safety hazard. Therefore, to avoid tab misalignment and improve safety, a solution capable of accurately measuring the electrode sheet thickness is needed.

[0067] To address the aforementioned technical problems, the inventors of this application discovered that when measuring electrode thickness, it is necessary to first measure the total thickness of the electrode and the guide roller, and then subtract the thickness of the guide roller from the total thickness to obtain the electrode thickness. However, if the guide roller exhibits circular runout, the obtained electrode thickness will be inaccurate. Therefore, the inventors of this application conducted further research and found that the installation of the guide roller requires a high degree of concentricity; otherwise, circular runout is easily caused. However, simply improving the installation accuracy, processing accuracy, and wear resistance of the guide roller cannot effectively solve the problem of circular runout, and therefore, accurate measurement of electrode thickness is still not possible.

[0068] Based on the above findings, the inventors of this application propose a method, system, and apparatus for measuring electrode thickness. This method determines a first thickness compensation coefficient corresponding to a first rotation angle based on a pre-calibrated correspondence between rotation angles and thickness compensation coefficients. Then, based on this first thickness compensation coefficient, it compensates for the first thickness of the electrode region located on the roller when the roller is at the first rotation angle. Thus, if the roller experiences circular runout, the first thickness compensation coefficient corresponding to the first rotation angle of the roller can be determined based on the pre-calibrated correspondence between rotation angles and thickness compensation coefficients. This allows for targeted compensation for circular runout, preventing inaccurate electrode thickness measurement due to roller runout, thereby improving the accuracy of electrode thickness measurement and preventing electrode tab misalignment caused by inaccurate thickness measurement, which could lead to safety issues.

[0069] The electrode thickness measurement method and system provided in the embodiments of this application will be described in detail below.

[0070] Figure 1 This is a schematic diagram of the structure of an electrode thickness measurement system provided in some embodiments of this application.

[0071] like Figure 1 As shown, the electrode thickness measurement system 100 may include: an encoder 110, a thickness gauge 120, and a processor 130.

[0072] The encoder 110 can be electrically connected to the processor 130 and can be used to record the first rotation angle of the roller on which the first pole piece is placed, and send the first rotation angle to the processor 130.

[0073] Specifically, encoder 110 can record the rotation angle of the roller and send the rotation angle of the roller to processor 130. The rotation angle of the roller recorded by encoder 110 may include a first rotation angle.

[0074] The thickness gauge 120 can be electrically connected to the processor 130 and can be used to measure the first thickness of the electrode region on the roller when the roller is at a first rotation angle, and send the first thickness to the processor 130.

[0075] The thickness gauge 120 can measure the thickness of the electrode area located on the roller and send the thickness to the processor 130. The thickness measured by the thickness gauge 120 may include a first thickness.

[0076] The thickness gauge 120 can be a contact thickness gauge or a non-contact thickness gauge.

[0077] For example, such as Figure 2 As shown, the detection direction of the thickness gauge 120 can be perpendicular to the electrode area located on the roller 300 in the first electrode 200.

[0078] The processor 130 can be used to determine the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode region.

[0079] The guide roller can be a circular roller. The guide roller can be a driven roller or a driven roller.

[0080] Therefore, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle can be determined. Then, based on the first thickness compensation coefficient, the first thickness of the electrode area on the roller in the first electrode sheet is compensated when the roller is located at the first rotation angle. In this way, if there is circular runout of the roller, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle of the roller can be determined. This allows for targeted circular runout compensation, avoiding inaccurate electrode sheet thickness measurement caused by roller runout, thereby improving the accuracy of electrode sheet thickness measurement and preventing electrode tab misalignment caused by inaccurate electrode sheet thickness measurement, which could lead to safety issues.

[0081] In some embodiments of this application, the electrode thickness measurement system may further include a driving element.

[0082] This drive unit can be mechanically connected to the roller and can be used to drive the roller to rotate.

[0083] Specifically, when the roller is an active roller, it can rotate without the need for a driving component. However, if the roller is a passive roller, it needs to be driven by a driving component to rotate. Therefore, the electrode thickness measurement system may also include a driving component.

[0084] For example, the drive unit can drive the roller to rotate at a low and uniform speed.

[0085] In this way, the roller can be driven to rotate by the drive component, so as to efficiently control the rotation of the roller and accurately control the rotation angle of the roller.

[0086] In some embodiments of this application, the electrode thickness measurement system may include a servo motor, which may include a driver and an encoder. The driver may be electrically connected to the encoder, and the encoder may be used to record the angle at which the driver drives the roller to rotate.

[0087] Specifically, when the roller is a passive roller, the electrode thickness measurement system may include a servo motor. The servo motor may include a drive unit and an encoder. In this way, the roller can be driven to rotate by the drive unit in the servo motor, and the rotation angle of the roller can be recorded by the encoder built into the servo motor.

[0088] In this way, the rotation angle of the roller can be accurately recorded by driving the roller rotation with a servo motor.

[0089] In some embodiments of this application, the driving component can be an active motor, which can be electrically connected to an encoder, and the encoder can be used to record the angle at which the active motor drives the roller to rotate.

[0090] Specifically, when the roller is a passive roller, the driving component can be an active motor, which can be used to drive the roller to rotate.

[0091] Since the active motor itself does not include an encoder, an additional encoder is required. The encoder is electrically connected to the active motor so that the encoder can record the angle of rotation of the roller driven by the active motor.

[0092] In this way, by equipping an additional encoder, the rotation angle of the roller can be recorded even when the roller is driven by an active motor, thus enabling the measurement of electrode thickness using a low-cost active motor.

[0093] In some embodiments of this application, the processor may include a lower-level machine.

[0094] The lower-level machine can be electrically connected to the encoder and the thickness gauge respectively.

[0095] The lower-level machine can be used to determine the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

[0096] Here, the lower-level device can be a programmable logic controller (PLC).

[0097] In this way, the electrode thickness can be determined by receiving the first rotation angle sent by the encoder and the first thickness sent by the thickness gauge from the lower-level machine. The time delay is small, and the electrode thickness can be determined in a timely manner.

[0098] In some embodiments of this application, the processor may include a host computer, and the electrode thickness measurement system may also include a slave computer. The host computer may be electrically connected to the slave computer, and the slave computer may be electrically connected to the encoder and the thickness gauge, respectively.

[0099] The lower-level machine can be used to receive the first rotation angle sent by the encoder and the first thickness sent by the thickness gauge, and send the first rotation angle and the first thickness to the upper-level machine;

[0100] The host computer can be used to determine the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

[0101] Here, the host computer can be an industrial computer or an edge controller. The slave computer can be a PLC.

[0102] In this way, calculating the electrode thickness via the host computer avoids consuming resources of the slave computer, thereby preventing any impact on production.

[0103] In some embodiments of this application, the electrode thickness measurement system is applied in at least one of a coating system, a rolling system, a slitting system, a die-cutting system, and a winding system.

[0104] Here, the coating system, rolling system, slitting system, die-cutting system, and winding system can all be systems used to process the electrode sheets during the battery production process.

[0105] The coating system can be applied to the coating process to coat active materials onto electrodes and to measure electrode thickness before, after, and / or during coating.

[0106] Roll forming systems can be applied to the rolling process to roll electrodes, and can measure electrode thickness before, after and / or during the rolling process.

[0107] The slitting system can be applied to the slitting process to slit the electrode sheet into multiple electrode sheets, and can measure the electrode sheet thickness before, after and / or during slitting.

[0108] Die-cutting systems can be applied to the die-cutting process, cutting tabs on the electrode sheet and measuring the electrode sheet thickness before, after, and / or during die-cutting.

[0109] The winding system can be applied to the winding process to wind the electrode sheet and can measure the electrode sheet thickness before, after and / or during the winding process.

[0110] This improves the accuracy of electrode thickness measurement during coating, rolling, slitting, die-cutting, and winding processes.

[0111] In addition, this electrode thickness measurement system can also be applied to other systems that require electrode thickness measurement.

[0112] This application also provides a method for measuring electrode thickness. The subject of this method can be an electrode thickness measurement system. The electrode thickness measurement method provided in this application is described below.

[0113] Figure 3 This is a flowchart illustrating a method for measuring electrode thickness provided in some embodiments of this application.

[0114] like Figure 3 As shown, the electrode thickness measurement method may include the following steps:

[0115] S310 records the first rotation angle of the roller on which the first pole piece is placed by the encoder and sends the first rotation angle to the processor.

[0116] S320, when the roller is at the first rotation angle, the thickness of the first electrode area located on the roller is measured by a thickness gauge and the first thickness is sent to the processor.

[0117] S330, the processor determines the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and compensates the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

[0118] Here, the first thickness can be the thickness of the electrode region on the roller where the first electrode is placed when the roller is at the first rotation angle.

[0119] The preset correspondence can include a pre-calibrated correspondence between rotation angles and thickness compensation coefficients. This preset correspondence can take the form of a table, curve, or formula. Specifically, it can be a table storing multiple rotation angles and their corresponding thickness compensation coefficients, a curve with the rotation angle on the horizontal axis and the thickness compensation coefficient on the vertical axis, or a formula for calculating the thickness compensation coefficient based on the rotation angle.

[0120] The thickness compensation coefficient can be used to compensate for circular runout of the electrode thickness obtained from actual measurements.

[0121] The first thickness can be the actual measured thickness. The target thickness can be closer to the true thickness.

[0122] The first thickness can be obtained by subtracting the thickness of the roller from the total thickness of the roller and electrode area. The thickness of the roller can be the diameter of the roller that has been measured in advance. However, due to the influence of the processing accuracy, installation accuracy and wear of the roller, the roller may have circular runout. This will cause the thickness of the roller measured by the thickness gauge to be different when the roller is at different rotation angles. It may not be equal to the diameter of the roller that has been measured in advance. Therefore, the first thickness obtained by subtracting the diameter of the roller that has been measured in advance from the total thickness measured by the thickness gauge is not accurate and needs to be compensated.

[0123] Because the thickness measured by the thickness gauge varies depending on the rotation angle of the roller, different thickness compensation coefficients are needed for different rotation angles. Here, based on a pre-calibrated correspondence between rotation angles and thickness compensation coefficients, a first thickness compensation coefficient corresponding to the first rotation angle is determined. Then, the first thickness is compensated based on this first thickness compensation coefficient to obtain the target thickness. This reduces the influence of circular runout on thickness measurement, making the target thickness closer to the true thickness of the electrode region.

[0124] For example, the formula for calculating the target thickness can be:

[0125] fi=(d-yi)*k

[0126] Where fi is the target thickness, d is the total thickness of the roller and the first electrode sheet measured by the thickness gauge, yi is the thickness of the roller measured by the thickness gauge, (d-yi) is the first thickness, and k is the first thickness compensation coefficient.

[0127] Therefore, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle can be determined. Then, based on the first thickness compensation coefficient, the first thickness of the electrode area on the roller in the first electrode sheet is compensated when the roller is located at the first rotation angle. In this way, if there is circular runout of the roller, based on the pre-calibrated correspondence between rotation angle and thickness compensation coefficient, the first thickness compensation coefficient corresponding to the first rotation angle of the roller can be determined. This allows for targeted circular runout compensation, avoiding inaccurate electrode sheet thickness measurement caused by roller runout, thereby improving the accuracy of electrode sheet thickness measurement and preventing electrode tab misalignment caused by inaccurate electrode sheet thickness measurement, which could lead to safety issues.

[0128] In some embodiments of this application, the preset correspondence may include the correspondence between multiple target rotation angles and their corresponding thickness compensation coefficients, and the preset correspondence can be calibrated by the following method:

[0129] S270, the processor obtains the second thickness corresponding to the rotation angles of multiple targets respectively;

[0130] S280, the processor obtains the third thickness corresponding to the rotation angles of multiple targets respectively;

[0131] S290, for each of the multiple target rotation angles, the processor determines the thickness compensation coefficient corresponding to the target rotation angle based on the fourth thickness of the second electrode, the second thickness corresponding to the target rotation angle, and the third thickness corresponding to the target rotation angle, and obtains the preset correspondence.

[0132] Here, the rotation angles of multiple targets can all be greater than or equal to 0° and less than 360°. The rotation angles of multiple targets can be evenly or relatively evenly distributed between 0° and 360°.

[0133] The second electrode can be an electrode with a standard thickness.

[0134] Specifically, before measuring the electrode thickness, a preset correspondence can be established, that is, the thickness compensation coefficient corresponding to each of the multiple target rotation angles can be established. The thickness compensation coefficient corresponding to each target rotation angle can be calculated based on the second thickness, the third thickness, and the fourth thickness of the second electrode corresponding to that target rotation angle.

[0135] The second thickness corresponding to the target rotation angle can be measured when the roller without the electrode is at the target rotation angle. The third thickness corresponding to the target rotation angle can be measured when the roller with the second electrode is at the target rotation angle.

[0136] For example, the formula for calculating the thickness compensation coefficient corresponding to the target rotation angle can be:

[0137]

[0138] Where k is the thickness compensation coefficient corresponding to the target rotation angle, w2 is the third thickness corresponding to the target rotation angle, w1 is the second thickness corresponding to the target rotation angle, and h is the fourth thickness of the second electrode.

[0139] In this way, through the above process, the thickness compensation coefficients corresponding to multiple target rotation angles can be accurately calibrated, that is, the preset correspondence can be used to compensate for the thickness measurement values ​​corresponding to different rotation angles when measuring the electrode thickness.

[0140] In some embodiments of this application, prior to S270, the method may further include:

[0141] S210 records multiple target rotation angles of the roller without electrode plates by an encoder and sends the multiple target rotation angles to the processor;

[0142] S220, for each of the multiple target rotation angles, when the roller is located at the target rotation angle, measures the second thickness of the roller without electrode plates by a thickness gauge and sends the second thickness to the processor;

[0143] S230, the processor determines the second thickness corresponding to the rotation angle of multiple targets respectively.

[0144] Here, the roller can be rotated when no electrode is placed on it, and the encoder can record the rotation angle of the roller. The rotation angle recorded by the encoder can include multiple target rotation angles.

[0145] A thickness gauge can measure the thickness of a roller, and the thickness measured by the thickness gauge can include multiple secondary thicknesses.

[0146] Multiple target rotation angles can be correlated one-to-one with multiple second thicknesses, and the processor can determine the second thickness corresponding to each of the multiple target rotation angles.

[0147] In this way, by recording the rotation angle of the roller with an encoder, measuring the thickness of the roller without electrode plates with a thickness gauge, and then matching multiple target rotation angles with multiple second thicknesses with a processor, the second thickness corresponding to each of the multiple target rotation angles can be accurately determined.

[0148] In some embodiments of this application, S230 may include:

[0149] S231, the processor obtains multiple preset rotation angles arranged in the target order.

[0150] S232, the processor obtains the second rotation angle of the roller.

[0151] S233, when the second rotation angle is greater than the first preset rotation angle and less than or equal to the second preset rotation angle, the processor determines the second rotation angle as the target rotation angle and determines the second thickness corresponding to the target rotation angle.

[0152] S234, the processor updates the first preset rotation angle to the second preset rotation angle, updates the second preset rotation angle to the third preset rotation angle, and returns to execute the process of obtaining the second rotation angle of the roller through the processor until the number of target rotation angles reaches the first threshold, and obtains the second thickness corresponding to the multiple target rotation angles respectively.

[0153] Here, the order of the targets can be from smallest to largest.

[0154] Multiple preset rotation angles can be preset rotation angles to be calibrated. However, since the actual rotation angle of the roller may not be exactly equal to the preset rotation angle during the subsequent calibration process, the calibration can be performed based on the actual rotation angle of the roller.

[0155] Multiple preset rotation angles can all be greater than or equal to 0° and less than 360°. These preset rotation angles can be evenly or relatively evenly distributed between 0° and 360°. For example, the multiple preset rotation angles may include 0°, 0.1°, 0.2°, 0.3°…359.9°.

[0156] The second rotation angle can be the current actual rotation angle of the roller.

[0157] The first preset rotation angle can be smaller than the second preset rotation angle. The first preset rotation angle and the second preset rotation angle can be two adjacent preset rotation angles from a plurality of preset rotation angles.

[0158] The second preset rotation angle can be smaller than the third preset rotation angle, and the second preset rotation angle and the third preset rotation angle can be two adjacent preset rotation angles among multiple preset rotation angles.

[0159] For example, when the first preset rotation angle is 0° and the second preset rotation angle is 0.1°, if the second rotation angle is 0.02°, then 0.02° can be used as a target rotation angle, and the second thickness corresponding to 0.02° can be determined. Then, when the third preset rotation angle is 0.2°, the first preset rotation angle can be updated to 0.1°, the second preset rotation angle can be updated to 0.2°, and the second rotation angle of the roller can be obtained again. If the second rotation angle of the roller is 0.15° at this time, then 0.15° can be used as a target rotation angle, and the second thickness corresponding to 0.15° can be determined. If the second rotation angle of the roller is 0.09° at this time, then the second rotation angle of the roller can be obtained again. The above process is iterated until the number of target rotation angles reaches a first threshold, and then the second thickness corresponding to multiple target rotation angles is obtained.

[0160] The first threshold can be set according to actual needs; for example, the first threshold can be 3600.

[0161] For example, the above-mentioned determination of the second thickness corresponding to multiple target rotation angles by the processor may include: obtaining N preset rotation angles arranged in target order by the processor; determining the i-th preset rotation angle among the N preset rotation angles by the processor; determining whether i is less than N by the processor; if i is less than N, and the second rotation angle is greater than the (i+1)-th preset rotation angle but not greater than the i-th preset rotation angle, determining the second rotation angle as the target rotation angle by the processor, and determining the second thickness corresponding to the target rotation angle; updating i to i+1 by the processor, and returning to the step of determining the i-th preset rotation angle among the N preset rotation angles by the processor, until i equals N.

[0162] Here, N can be a positive integer, and the initial value of i can be 1.

[0163] Specifically, the processor can pre-set N preset rotation angles arranged in ascending order, then select the i-th preset rotation angle from the N preset rotation angles arranged in a second order, and determine whether i is less than N. If i is less than N, it indicates that for the roller without an electrode, there are still some rotation angles for which the thickness needs to be measured; if i is equal to N, it indicates that for the roller without an electrode, the thickness measurement has been completed.

[0164] If i is less than N, then determine whether the second rotation angle is greater than the (i+1)th preset rotation angle and not greater than the ith preset rotation angle. If yes, it indicates that the current second rotation angle has rotated a certain angle from the previous calibrated rotation angle, and the target rotation angle can be determined again. Therefore, the second rotation angle can be determined as the target rotation angle, and the second thickness corresponding to the target rotation angle can be determined. Then, i is updated to i+1, and the process returns to execute the step of determining the ith preset rotation angle among N preset rotation angles by the processor. If no, it indicates that the current second rotation angle has not rotated a certain angle from the previous calibrated rotation angle, and the thickness compensation coefficient between two such close angles is very small. There is no need to calibrate two such close angles, so the second rotation angle does not need to be determined as the target rotation angle.

[0165] If i equals N, then the calibration of the second thickness can be stopped.

[0166] For example, N can be 3600. An array a[xi,yi] can be pre-set and initialized. After initialization, xi = 0, 0.1, 0.2…359.9; yi = 0 (i = 1, 2, 3…3600). Here, after initialization, xi can be N preset rotation angles, and yi can be used to store the second thickness. The second rotation angle can be θ. If θ is determined as the target rotation angle, xi can be updated with θ, so that in the final array a[xi,yi], xi represents the target rotation angle, and yi can be the second thickness corresponding to xi.

[0167] Thus, through the above process, the thickness of the roller without electrode plates at multiple target rotation angles can be automatically calibrated without manual calibration, which is highly efficient and accurate. Furthermore, the target rotation angles to be calibrated can be reasonably selected to avoid calibrating angles that are too close together, thus avoiding wasting computing resources.

[0168] In some embodiments of this application, after S232, the method may further include:

[0169] S235, the processor determines the duration during which the second rotation angle is less than the first preset rotation angle;

[0170] S236, if the duration exceeds the second threshold, the processor outputs the first prompt message.

[0171] Here, the first prompt message can be used to indicate that the roller is rotating abnormally.

[0172] For example, the output form of the first prompt information can be at least one of text, image, sound, and vibration.

[0173] If the second rotation angle is continuously less than the first preset rotation angle, it can indicate that the roller has not rotated to the next rotation angle range. If the duration of the second rotation angle being continuously less than the first preset rotation angle is greater than the second threshold, it can indicate that the roller has not rotated to the next rotation angle range after a long period of time. The roller may be rotating abnormally. Therefore, the first prompt message can be output to indicate that the roller is rotating abnormally.

[0174] For example, after the processor determines whether i is less than N, if i is less than N, the processor determines the duration for which the second rotation angle is less than the (i+1)th preset rotation angle; if the duration is greater than the second threshold, the processor outputs the first prompt information.

[0175] Specifically, i being less than N indicates that for rollers without electrodes, there are certain rotation angles corresponding to thicknesses that need to be measured. In this case, the duration for which the second rotation angle is less than the (i+1)th preset rotation angle can be monitored, and it can be determined whether the duration exceeds a second threshold. If the duration exceeds the second threshold, it indicates that the roller has not rotated to the next rotation angle range after a relatively long time, and the roller may be experiencing a rotational abnormality. Therefore, a first prompt message can be output to indicate that the roller is experiencing a rotational abnormality.

[0176] Thus, through the above process, when the rollers rotate abnormally, a first prompt message can be output to indicate that the rollers are rotating abnormally, so that users can promptly detect the abnormality and take appropriate measures.

[0177] In some embodiments of this application, prior to S210, the method may further include:

[0178] S201, the processor responds to the input to start the calibration program and acquires the thickness data measured by the thickness gauge;

[0179] S202, the processor determines whether there are electrode sheets placed on the roller based on thickness data;

[0180] S203, calibrate the preset correspondence when no electrode sheet is placed on the roller.

[0181] Here, the input to start the calibration program can be used to start a program that calibrates a preset correspondence.

[0182] The thickness data measured by the thickness gauge is different when there are electrode sheets on the roller and when there are no electrode sheets. Therefore, it is possible to determine whether there are electrode sheets on the roller based on the thickness data measured by the thickness gauge.

[0183] Specifically, if no electrode is placed on the roller, the preset correspondence can be calibrated; if an electrode is placed on the roller, the preset correspondence can be left uncalibrated.

[0184] For example, the input to start the calibration procedure may refer to the user clicking a control or button to start the calibration procedure.

[0185] Thus, through the above process, the user can flexibly control whether to perform the calibration of the preset correspondence, and can automatically determine whether there are electrode sheets on the roller. If it is determined that there are no electrode sheets on the roller, the calibration of the preset correspondence will begin, thus avoiding the impact on normal production due to the start of the calibration program.

[0186] In some embodiments of this application, after S202, the method may further include:

[0187] S204, when an electrode sheet is placed on the roller, the processor outputs a second prompt message.

[0188] Here, the second prompt can be used to indicate that the electrode placed on the roller should be removed.

[0189] For example, the output form of the second prompt information can be at least one of text, image, sound, and vibration.

[0190] Specifically, since the electrode sheets placed on the roller cannot be calibrated according to the preset correspondence, if there are electrode sheets placed on the roller, a second prompt message can be output to prompt the user to remove the electrode sheets placed on the roller so that the preset correspondence can be calibrated.

[0191] In addition, after outputting the second prompt message, the process can return to execute the step of obtaining the thickness data measured by the thickness gauge through the processor; and then use the processor to determine whether there is an electrode on the roller based on the thickness data, so that after the electrode is removed, it can be promptly detected that no electrode is placed on the roller, and the preset correspondence can be calibrated in a timely manner.

[0192] Thus, by outputting a second prompt message when an electrode is placed on the roller, prompting the user to remove the electrode placed on the roller, the user can promptly detect and remove the electrode if it is not removed, thus avoiding affecting the calibration of the preset correspondence.

[0193] In some embodiments of this application, prior to S280, the method may further include:

[0194] S240 records multiple target rotation angles of the roller on which the second pole piece is placed using an encoder, and sends the multiple target rotation angles to the processor;

[0195] S250, for each of the multiple target rotation angles, when the roller is located at the target rotation angle, measures the third thickness of the roller on which the second electrode is placed by a thickness gauge and sends the third thickness to the processor.

[0196] S260 uses a processor to determine the third thickness corresponding to the rotation angles of multiple targets.

[0197] Here, the roller can be rotated when a second pole piece is placed on it. The encoder can record the rotation angle of the roller, and the recorded rotation angle can include multiple target rotation angles.

[0198] A thickness gauge can measure the thickness of a roller, and the thickness measured by the thickness gauge can include multiple third thicknesses.

[0199] Multiple target rotation angles can be correlated one-to-one with multiple third thicknesses, and the processor can determine the third thickness corresponding to each of the multiple target rotation angles.

[0200] In this way, by recording the rotation angle of the roller by the encoder, measuring the thickness of the roller on which the second pole piece is placed by the thickness gauge, and then matching the multiple target rotation angles with the multiple third thicknesses by the processor, the third thicknesses corresponding to the multiple target rotation angles can be accurately determined.

[0201] In some embodiments of this application, after S290, the method may further include:

[0202] S291, the processor determines the range of the second thickness corresponding to the rotation angles of multiple targets respectively;

[0203] S292, for each thickness compensation coefficient in the thickness compensation coefficient corresponding to multiple target rotation angles, the processor determines the circular runout value of the roller based on the thickness compensation coefficient and the range, and obtains multiple circular runout values;

[0204] S293, if any one of the multiple circular jump values ​​is greater than the third threshold, the processor outputs a third prompt message.

[0205] Here, the third prompt can be used to indicate abnormal circular runout of the roller.

[0206] For example, the output form of the third prompt information can be at least one of text, image, sound, and vibration.

[0207] The third threshold can be set according to actual needs.

[0208] Specifically, after determining the thickness compensation coefficients corresponding to multiple target rotation angles, for each thickness compensation coefficient corresponding to the multiple target rotation angles, the circular runout value can be determined based on the range of the second thickness corresponding to the multiple target rotation angles and the thickness compensation coefficient, resulting in multiple circular runout values. If any circular runout value is greater than the third threshold, it can indicate that there is a circular runout abnormality in the roller, and therefore a third prompt message can be output to indicate that there is a circular runout abnormality in the roller.

[0209] For example, the formula for calculating any circular runout value can be: e = R * k. Where e is the circular runout value, R is the range of the second thickness corresponding to the rotation angles of multiple targets, and k is the thickness compensation coefficient.

[0210] In this way, by calculating the circular runout value, it is possible to accurately determine whether there is an abnormality in the circular runout of the roller. When an abnormality in the circular runout of the roller occurs, a third prompt message is output to indicate that an abnormality has occurred, so that users can detect the abnormality in time and take corresponding measures.

[0211] In some embodiments of this application, the method may further include:

[0212] S200, under the condition that the electrode sheet placed on the roller travels a preset length, the preset correspondence of the roller is recalibrated.

[0213] Here, the preset length can be set according to actual needs; for example, the preset length can be 50,000 meters.

[0214] Specifically, for each preset length of the belt traveled by the electrode sheet placed on the roller, it can be assumed that the roller has already experienced a certain amount of wear. Since wear affects the thickness of the roller, it leads to inaccurate measurement of the electrode sheet thickness. Therefore, it is necessary to recalibrate the thickness compensation coefficient corresponding to different target rotation angles of the roller, that is, to recalibrate the preset correspondence.

[0215] In this way, through the above process, the preset correspondence can be recalibrated after the rollers have worn to a certain extent, thus avoiding inaccurate electrode thickness measurement due to roller wear.

[0216] In some embodiments of this application, the method may further include: calibrating a preset correspondence when it is determined that the electrode sheet placed on the roller is in a non-belt-running state. This avoids calibration during normal production, thus preventing disruption to normal production.

[0217] In some embodiments of this application, when the electrode placed on the roller travels a preset length and is in a non-traffic state, a second prompt message can be output; then, the processor responds to the input to start the calibration program, obtains the thickness data measured by the thickness gauge, determines whether an electrode is placed on the roller based on the thickness data, and performs calibration of the preset correspondence if no electrode is placed on the roller.

[0218] In some embodiments of this application, prior to S330, the method may further include:

[0219] S300 receives the third rotation angle of the roller on which the first electrode is placed via a processor;

[0220] S330 may include:

[0221] S331, when the difference between the first rotation angle and the third rotation angle is greater than or equal to the fourth threshold, the processor determines the first thickness compensation coefficient corresponding to the first rotation angle based on the preset correspondence, and compensates the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

[0222] Here, the third rotation angle can be recorded by the encoder and sent to the processor.

[0223] The time interval between the moment corresponding to the third rotation angle and the moment corresponding to the first rotation angle can be a preset time interval.

[0224] Both the preset duration and the fourth threshold can be set according to actual needs.

[0225] If the difference between the first rotation angle and the third rotation angle is greater than or equal to the fourth threshold, it can indicate that the rotation angle of the roller within the preset time period is greater than or equal to the fourth threshold. This indicates that the roller is rotating normally with the electrode sheet, and therefore the electrode sheet thickness can be measured.

[0226] Thus, through the above process, electrode thickness measurement can be performed only when the roller is confirmed to be rotating normally with the electrode belt, avoiding inaccurate electrode thickness measurement due to abnormal roller rotation.

[0227] In some embodiments of this application, after S300, the method may further include:

[0228] S340, if the difference between the first rotation angle and the third rotation angle is less than the fourth threshold, the processor outputs the fourth prompt message.

[0229] Here, the fourth prompt can be used to indicate that the roller is rotating abnormally.

[0230] For example, the output form of the fourth prompt information can be at least one of text, image, sound, and vibration.

[0231] Specifically, if the difference between the first rotation angle and the third rotation angle is less than the fourth threshold, it can indicate that the rotation angle of the roller within the preset time is less than the fourth threshold. This indicates that the roller rotation is abnormal and it does not rotate normally with the electrode belt. Therefore, the electrode thickness measurement can be omitted, and instead, a fourth prompt message can be output to indicate that the roller rotation is abnormal.

[0232] Thus, through the above process, a fourth prompt message can be output when the roller rotates abnormally, indicating that the roller has rotated abnormally, so that the user can detect the abnormality in time and take corresponding measures.

[0233] In some embodiments of this application, the above-mentioned determination of the first thickness compensation coefficient corresponding to the first rotation angle by the processor based on a preset correspondence may include:

[0234] S332, when the first rotation angle is equal to the first target rotation angle among multiple target rotation angles, the thickness compensation coefficient corresponding to the first target rotation angle is determined as the first thickness compensation coefficient corresponding to the first rotation angle.

[0235] S333, when the first rotation angle is not equal to any of the multiple target rotation angles, the first thickness compensation coefficient corresponding to the first rotation angle is determined based on the thickness compensation coefficient corresponding to the second target rotation angle.

[0236] Here, the multiple target rotation angles may include the first target rotation angle. If the first rotation angle is equal to the first target rotation angle among the multiple target rotation angles, then the thickness compensation coefficient corresponding to the first target rotation angle can be determined as the first thickness compensation coefficient corresponding to the first rotation angle.

[0237] Since the first rotation angle is not necessarily exactly equal to a certain target rotation angle, if the first rotation angle is not equal to any of the multiple target rotation angles, the first thickness compensation coefficient corresponding to the first rotation angle can be determined based on the thickness compensation coefficient corresponding to the target rotation angle that is close to the first rotation angle.

[0238] A target rotation angle close to the first rotation angle can be a second target rotation angle. Multiple target rotation angles can include the second target rotation angle. The difference between the second target rotation angle and the first rotation angle can be less than the fifth threshold.

[0239] Specifically, the second target rotation angle can be the target rotation angle with the smallest difference from the first rotation angle among multiple target rotation angles. In this way, the thickness compensation coefficient corresponding to the second target rotation angle can be determined as the first thickness compensation coefficient corresponding to the first rotation angle.

[0240] The second target rotation angle can be the target rotation angle with the smallest difference from the first rotation angle that is greater than the first rotation angle. In this way, the thickness compensation coefficient corresponding to the second target rotation angle can be determined as the first thickness compensation coefficient corresponding to the first rotation angle.

[0241] The second target rotation angle can be the target rotation angle with the smallest difference from the first rotation angle that is smaller than the first rotation angle. In this way, the thickness compensation coefficient corresponding to the second target rotation angle can be determined as the first thickness compensation coefficient corresponding to the first rotation angle.

[0242] The second target rotation angle can include target rotation angles greater than the first rotation angle with the smallest difference from the first rotation angle, and target rotation angles less than the first rotation angle with the smallest difference from the first rotation angle. Thus, the first thickness compensation coefficient corresponding to the first rotation angle can be determined based on the thickness compensation coefficients corresponding to the two target rotation angles included in the second target rotation angle. Specifically, the average value of the thickness compensation coefficients corresponding to the two target rotation angles included in the second target rotation angle can be determined as the first thickness compensation coefficient corresponding to the first rotation angle; alternatively, a linear function can be obtained by fitting the two target rotation angles included in the second target rotation angle and their corresponding thickness compensation coefficients, and the first thickness compensation coefficient corresponding to the first rotation angle can be calculated based on this linear function.

[0243] For example, the first rotation angle is 0.12°, and 0.1° is the target rotation angle with the smallest difference from 0.12° among those less than 0.12°. Therefore, 0.1° is the second target rotation angle, and the thickness compensation coefficient corresponding to 0.1° can be determined as the first thickness compensation coefficient corresponding to 0.12°.

[0244] Thus, through the above process, the first thickness compensation coefficient can be determined more reasonably when the first rotation angle is not equal to any target rotation angle, so as to accurately determine the electrode thickness.

[0245] To better describe the entire solution, based on the above embodiments, a specific example is given to provide a detailed description of the process for marking the preset correspondence in the embodiments of this application.

[0246] like Figure 4 As shown, the process for calibrating the preset correspondence can include S401-S412, which will be explained in detail below.

[0247] S401, Obtain N preset rotation angles arranged in the target order.

[0248] S402, determine the i-th preset rotation angle among N preset rotation angles.

[0249] S403, determine if i is less than N.

[0250] If yes, then execute S404; otherwise, execute S408.

[0251] S404, obtain the second rotation angle.

[0252] S405, determine whether the second rotation angle is greater than the (i+1)th preset rotation angle and not greater than the ith preset rotation angle.

[0253] If yes, then execute S406; otherwise, return to execute S404.

[0254] S406, the second rotation angle is determined as the target rotation angle, and the target rotation angle and its corresponding second thickness are saved.

[0255] S407, i = i + 1, and return to execute S402.

[0256] S408, obtain the third thickness corresponding to the rotation angle of multiple targets respectively.

[0257] S409, for each of the multiple target rotation angles, the processor determines the thickness compensation coefficient corresponding to the target rotation angle based on the fourth thickness of the second electrode, the second thickness corresponding to the target rotation angle, and the third thickness corresponding to the target rotation angle.

[0258] S410, for each thickness compensation coefficient in the thickness compensation coefficient corresponding to the multiple target rotation angles, the processor determines the circular runout value of the roller based on the range of the thickness compensation coefficient and the second thickness corresponding to the multiple target rotation angles, and obtains multiple circular runout values.

[0259] S411, determine whether there is a circular jump value greater than the third threshold among multiple circular jump values.

[0260] If yes, then execute S412; otherwise, end.

[0261] S412, output the third prompt message.

[0262] The specific processes of S401-S412 can be found in the above embodiments, and will not be repeated here.

[0263] To better describe the entire solution, based on the above embodiments, a specific example is given to provide a detailed description of the process for recalibrating the preset correspondence in the embodiments of this application.

[0264] like Figure 5 As shown, the process of recalibrating the preset correspondence may include S510-S560, which will be explained in detail below.

[0265] S510: Obtain the belt running status of the electrode sheet on the roller and the length of the belt running of the electrode sheet after the roller has been calibrated and preset correspondence most recently.

[0266] S520, determine whether the roller meets the preset conditions.

[0267] The preset conditions may include that the electrode placed on the roller is in a non-carrying state, and that the roller drives the electrode to carry a belt to a preset length after the most recent calibration of the preset correspondence.

[0268] If yes, then execute S530; otherwise, return to execute S510.

[0269] S530, output the second prompt message.

[0270] S540, in response to the input to start the calibration program, acquires the thickness data measured by the thickness gauge.

[0271] S550 determines whether there are electrode sheets placed on the roller based on thickness data.

[0272] If yes, then return to execute S530; otherwise, execute S560.

[0273] S560 performs the calibration of the preset correspondence.

[0274] The specific processes of S510-S560 can be found in the above embodiments, and will not be repeated here.

[0275] To better describe the entire scheme, based on the above embodiments, a specific example is given to provide a detailed description of the process for measuring electrode thickness in the embodiments of this application.

[0276] like Figure 6 As shown, the process for measuring electrode thickness can include steps S610-S660, which will be explained in detail below.

[0277] S610, obtain the first rotation angle.

[0278] S620, determine whether the difference between the first rotation angle and the third rotation angle is greater than or equal to the fourth threshold.

[0279] If yes, then execute S630; otherwise, execute S660.

[0280] S630, determine the first thickness compensation coefficient corresponding to the first rotation angle based on the preset correspondence.

[0281] S640, the first thickness is compensated based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

[0282] S650, determines whether the electrode thickness measurement function is enabled.

[0283] If yes, then return to execute S610; otherwise, end.

[0284] S660, output the fourth prompt message.

[0285] The specific processes of S610-S660 can be found in the above embodiments, and will not be repeated here.

[0286] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for measuring electrode thickness, characterized in that, include: The encoder records the first rotation angle of the roller on which the first pole piece is placed, and sends the first rotation angle to the processor; When the roller is at the first rotation angle, the first thickness of the electrode region located on the roller in the first electrode is measured by a thickness gauge, and the first thickness is sent to the processor. The processor determines the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and compensates for the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode region. The preset correspondence includes a pre-calibrated correspondence between the rotation angle and the thickness compensation coefficient.

2. The method according to claim 1, characterized in that, The preset correspondence includes the correspondence between multiple target rotation angles and their corresponding thickness compensation coefficients. The preset correspondence is obtained by the following method: The processor obtains the second thickness corresponding to the plurality of target rotation angles respectively. The second thickness corresponding to the target rotation angle is measured when the roller without electrode is located at the target rotation angle. The plurality of target rotation angles are all greater than or equal to 0° and less than 360°. The processor obtains the third thickness corresponding to each of the plurality of target rotation angles. The third thickness corresponding to the target rotation angle is measured when the roller on which the second electrode is placed is located at the target rotation angle. For each of the plurality of target rotation angles, the processor determines the thickness compensation coefficient corresponding to the target rotation angle based on the fourth thickness of the second electrode, the second thickness corresponding to the target rotation angle, and the third thickness corresponding to the target rotation angle, thereby obtaining the preset correspondence.

3. The method according to claim 2, characterized in that, Before obtaining the second thickness corresponding to the rotation angles of the plurality of targets through the processor, the method further includes: The encoder records multiple target rotation angles of the roller without electrode plates and sends the multiple target rotation angles to the processor. For each of the plurality of target rotation angles, when the roller is located at the target rotation angle, the second thickness of the roller without electrode plates is measured by a thickness gauge and the second thickness is sent to the processor. The processor determines the second thickness corresponding to the rotation angle of each of the plurality of targets.

4. The method according to claim 3, characterized in that, The step of determining the second thickness corresponding to the rotation angles of the plurality of targets by the processor includes: The processor acquires multiple preset rotation angles arranged in a target order, wherein each preset rotation angle is greater than or equal to 0° and less than 360°. The processor obtains the second rotation angle of the roller. When the second rotation angle is greater than the first preset rotation angle and less than or equal to the second preset rotation angle, the processor determines the second rotation angle as the target rotation angle and determines the second thickness corresponding to the target rotation angle. The first preset rotation angle is less than the second preset rotation angle, and the first preset rotation angle and the second preset rotation angle are two adjacent preset rotation angles among the plurality of preset rotation angles. The processor updates the first preset rotation angle to the second preset rotation angle, updates the second preset rotation angle to the third preset rotation angle, and returns to execute the process of obtaining the second rotation angle of the roller through the processor until the number of target rotation angles reaches a first threshold, thereby obtaining the second thickness corresponding to the plurality of target rotation angles respectively. The second preset rotation angle is less than the third preset rotation angle, and the second preset rotation angle and the third preset rotation angle are two adjacent preset rotation angles among the plurality of preset rotation angles.

5. The method according to claim 4, characterized in that, After obtaining the second rotation angle of the roller through the processor, the method further includes: The processor determines the duration during which the second rotation angle is less than the first preset rotation angle; If the duration exceeds the second threshold, the processor outputs a first prompt message, which is used to indicate that the roller has a rotational abnormality.

6. The method according to claim 2, characterized in that, The method further includes: The processor responds to the input to start the calibration program and acquires the thickness data measured by the thickness gauge. The processor determines whether an electrode sheet is placed on the roller based on the thickness data. When no electrode sheet is placed on the roller, the preset correspondence is calibrated.

7. The method according to claim 6, characterized in that, The method further includes: When an electrode sheet is placed on the roller, the processor outputs a second prompt message, which prompts the removal of the electrode sheet placed on the roller.

8. The method according to claim 2, characterized in that, Before obtaining the third thickness corresponding to the rotation angles of the plurality of targets through the processor, the method further includes: The encoder records multiple target rotation angles of the roller on which the second pole piece is placed, and sends the multiple target rotation angles to the processor; For each of the plurality of target rotation angles, when the roller is located at the target rotation angle, the third thickness of the roller on which the second electrode is placed is measured by the thickness gauge, and the third thickness is sent to the processor; The processor determines the third thickness corresponding to the rotation angle of each of the multiple targets.

9. The method according to claim 2, characterized in that, After determining the thickness compensation coefficient corresponding to the target rotation angle, the method further includes: The processor determines the range of the second thickness corresponding to the rotation angles of the plurality of targets, respectively; For each thickness compensation coefficient corresponding to the plurality of target rotation angles, the processor determines the circular runout value of the roller based on the thickness compensation coefficient and the range, thereby obtaining a plurality of circular runout values; If any one of the plurality of circular runout values ​​is greater than a third threshold, the processor outputs a third prompt message, which is used to indicate that the roller has a circular runout abnormality.

10. The method according to any one of claims 2-9, characterized in that, The method further includes: With each electrode sheet placed on the roller traveling a predetermined length, the predetermined correspondence of the roller is recalibrated.

11. The method according to claim 1, characterized in that, The method further includes: The processor receives the third rotation angle of the roller on which the first electrode is placed, and the duration between the time corresponding to the third rotation angle and the time corresponding to the first rotation angle is a preset duration. The step of determining a first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence by the processor, and compensating for the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode region includes: When the difference between the first rotation angle and the third rotation angle is greater than or equal to a fourth threshold, the processor determines the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and compensates the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode region.

12. The method according to claim 11, characterized in that, The method further includes: If the difference between the first rotation angle and the third rotation angle is less than the fourth threshold, the processor outputs a fourth prompt message, which is used to indicate that the roller has a rotational abnormality.

13. The method according to claim 2, characterized in that, The step of determining the first thickness compensation coefficient corresponding to the first rotation angle by the processor based on a preset correspondence includes: When the first rotation angle is equal to the first target rotation angle among the plurality of target rotation angles, the thickness compensation coefficient corresponding to the first target rotation angle is determined as the first thickness compensation coefficient corresponding to the first rotation angle. When the first rotation angle is not equal to any of the plurality of target rotation angles, a first thickness compensation coefficient corresponding to the first rotation angle is determined based on the thickness compensation coefficient corresponding to the second target rotation angle. The plurality of target rotation angles include the second target rotation angle, and the difference between the second target rotation angle and the first rotation angle is less than a fifth threshold.

14. An electrode thickness measurement system, characterized in that, include: An encoder, electrically connected to a processor, is used to record the first rotation angle of the roller on which the first pole piece is placed, and to send the first rotation angle to the processor. A thickness gauge, electrically connected to the processor, is used to measure the first thickness of the electrode region on the roller when the roller is at a first rotation angle, and to send the first thickness to the processor. The processor is configured to determine a first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode region. The preset correspondence includes a pre-calibrated correspondence between the rotation angle and the thickness compensation coefficient.

15. The system according to claim 14, characterized in that, The system also includes: A drive unit, mechanically connected to the roller, is used to drive the roller to rotate.

16. The system according to claim 15, characterized in that, The system includes a servo motor, which includes a drive unit and an encoder. The drive unit is electrically connected to the encoder, and the encoder is used to record the angle at which the drive unit drives the roller to rotate.

17. The system according to claim 15, characterized in that, The driving component is an active motor, which is electrically connected to the encoder. The encoder is used to record the angle at which the active motor drives the roller to rotate.

18. The system according to claim 14, characterized in that, The processor includes a lower-level machine, which is electrically connected to the encoder and the thickness gauge respectively. The lower-level machine is used to determine the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

19. The system according to claim 14, characterized in that, The processor includes a host computer, and the system also includes a slave computer. The host computer is electrically connected to the slave computer, and the slave computer is electrically connected to the encoder and the thickness gauge, respectively. The lower-level machine is used to receive the first rotation angle sent by the encoder and the first thickness sent by the thickness gauge, and send the first rotation angle and the first thickness to the upper-level machine; The host computer is used to determine the first thickness compensation coefficient corresponding to the first rotation angle based on a preset correspondence, and to compensate the first thickness based on the first thickness compensation coefficient to obtain the target thickness of the electrode area.

20. The system according to any one of claims 14 to 19, applied in at least one of a coating system, a rolling system, a slitting system, a die-cutting system, and a winding system.

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