Winding method and winding machine

Abstract

The application discloses a winding method and a winding machine. The winding method of the application comprises the following steps: for each tab cluster, based on the rotated angle of the reference winding needle corresponding to the reference tab pair of the reference winding body, the reference walking length of the reference tab, the plurality of tab walking lengths of the tab corresponding to the tab cluster, and the rotated angle of the corresponding winding needle, the dislocation amount of each tab is determined; the dislocation type of the tab cluster is determined according to the dislocation amount of the tab in the tab cluster; the dislocation amount of the tab cluster is determined according to the dislocation amount of the tab in the tab cluster and the dislocation type of the tab cluster; and the first rotating angle that the winding needle needs to continue rotating from the preset unloading angle after obtaining the winding body is determined according to the dislocation amount of the cathode tab cluster and the dislocation amount of the anode tab cluster, so that the winding body can be unloaded from the winding needle, and then unloaded to the pre-pressing position for pre-pressing, so that the winding body can be pre-pressed from a suitable angle, and the tab dislocation condition of the pre-pressed winding body is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a winding method and a winding machine. Background Technology

[0002] With the development of battery technology, the requirements for battery quality are becoming increasingly stringent.

[0003] In battery production, the manufacturing quality of the battery cell is crucial. The cell undergoes processes such as winding, pre-pressing, and cold pressing. However, as a vital component of the cell, the electrode tabs may become misaligned during production, impacting battery reliability.

[0004] Therefore, a solution is needed to improve electrode misalignment. Summary of the Invention

[0005] In a first aspect, this application provides a winding method for winding an anode electrode, a first diaphragm, a cathode electrode, and a second diaphragm using a nail to form a wound body. The wound body includes multiple tab clusters, which include anode tab clusters and cathode tab clusters. The anode electrode includes multiple anode tabs, which are formed by stacking multiple anode electrode layers in the wound body. The cathode electrode includes multiple cathode tabs, which are formed by stacking multiple cathode electrode layers in the wound body. The method includes: for each tab cluster, based on a reference to the wound body... The misalignment of each tab is determined by the rotation angle of the reference winding needle corresponding to the tab, the reference feed length of the reference tab, the feed lengths of multiple electrodes corresponding to the tab cluster, and the rotation angle of the corresponding winding needle. The misalignment type of the tab cluster is determined based on the misalignment of the tabs in the tab cluster. The misalignment of the tab cluster is determined based on the misalignment of the tabs in the tab cluster and the misalignment type of the tab cluster. Based on the misalignment of the cathode tab cluster and the anode tab cluster, the first rotation angle at which the winding needle needs to continue rotating from the preset feeding angle after the winding body is obtained is determined, so that the winding body can be fed from the winding needle.

[0006] Thus, this method, for each tab cluster, determines the misalignment amount of each tab based on the rotation angle of the reference needle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the tape lengths of multiple electrodes corresponding to the tab cluster, and the rotation angle of the corresponding needle. Based on the misalignment amount of the tabs in the tab cluster, the misalignment type of the tab cluster is determined. Based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster, the misalignment amount of the tab cluster is determined. Based on the misalignment amounts of the cathode tab cluster and the anode tab cluster, a first rotation angle is determined from the preset feeding angle so that the winding body can be fed from the needle. In this way, after obtaining the winding body, the needle can be controlled to continue rotating at this first rotation angle before feeding to the pre-pressing position for pre-pressing. This allows for pre-pressing of the winding body at an appropriate angle, improving the tab misalignment of the pre-pressed winding body.

[0007] In some embodiments, determining the misalignment type of a tab cluster based on the amount of misalignment of the tabs in the tab cluster includes: determining a first characteristic tab from a plurality of tabs included in the tab cluster; and determining the misalignment type of the tab cluster based on the amount of misalignment of the first characteristic tab.

[0008] Thus, judging the type of misalignment based on its misalignment amount can more accurately and efficiently capture the overall misalignment manifestation of the pole-to-pole ear cluster, making the judgment of the misalignment type more efficient and accurate.

[0009] In some embodiments, determining the misalignment amount of a tab cluster based on the misalignment amount and misalignment type of the tab cluster includes: determining a second characteristic tab from a plurality of tabs included in the tab cluster based on the misalignment type of the tab cluster; and determining the misalignment amount of the tab cluster based on the misalignment amount of the second characteristic tab.

[0010] Thus, by selectively choosing second characteristic tabs based on the type of misalignment, the misalignment amount of these second characteristic tabs can more accurately reflect the actual misalignment of the overall misalignment amount of the tab cluster. Calculating the misalignment amount of the tab cluster using the misalignment amount of these second characteristic tabs can effectively improve the accuracy of the misalignment amount of the tab cluster.

[0011] In some embodiments, the first characteristic tab includes at least the outermost tab and the innermost tab of the tab cluster. Based on the misalignment amount of the first characteristic tab, the misalignment type of the tab cluster is determined, including: calculating a first difference between the misalignment amount of the outermost tab and the misalignment amount of the innermost tab; if the first difference is greater than a first threshold, the misalignment type of the tab cluster is determined to be the first misalignment type.

[0012] In this way, by focusing on the difference in misalignment between the outermost and innermost tabs, the continuous accumulation of deviations in the tab clusters can be captured more accurately. Compared with a general analysis of all tabs, this improves the accuracy of misalignment type judgment, and requires fewer tabs to be analyzed, resulting in higher analysis efficiency.

[0013] In some embodiments, determining a second characteristic electrode from a plurality of electrodes included in an electrode cluster includes: determining each electrode included in the electrode cluster as a second characteristic electrode.

[0014] Thus, determining the overall misalignment of the tab cluster based on the misalignment of each tab can greatly improve the calculation accuracy.

[0015] In some embodiments, the first characteristic tab includes at least the outermost tab, the innermost tab, and the middle tab of the tab cluster. Based on the misalignment amount of the first characteristic tab, the misalignment type of the tab cluster is determined, including: calculating a second difference between the misalignment amount of the outermost tab and the misalignment amount of the middle tab, a third difference between the misalignment amount of the innermost tab and the misalignment amount of the middle tab, and a fourth difference between the misalignment amount of the outermost tab and the misalignment amount of the innermost tab; if the second difference and the third difference are both greater than a second threshold and the fourth difference is less than the third threshold, the misalignment type of the tab cluster is determined to be the second misalignment type.

[0016] In this way, the second type of misaligned pole ear clusters can be effectively captured, the analysis efficiency is high, the possibility of misjudgment is reduced, and the judgment results are more reliable.

[0017] In some embodiments, determining a second characteristic electrode from a plurality of electrodes included in an electrode cluster includes: determining the second characteristic electrode based on the outermost electrode, the innermost electrode, and the intermediate electrode of the electrode cluster.

[0018] Thus, by determining the second characteristic electrode based on the representative innermost, outermost, and middle layer electrodes, the overall misalignment of the electrode cluster can be determined based on the misalignment of the second characteristic electrode, greatly improving the calculation accuracy.

[0019] In some embodiments, the first characteristic tab includes at least the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster from the outermost to the innermost layer, and the tab located at 3 / 4 of the tab cluster from the outermost to the innermost layer. Based on the misalignment of the first characteristic tab, the misalignment type of the tab cluster is determined, including: calculating a fifth difference between the misalignment of the tab at 1 / 4 and the misalignment of the middle tab, a sixth difference between the misalignment of the middle tab and the misalignment of the tab at 3 / 4, and the misalignment of the innermost tab. The seventh difference between the position quantity and the misalignment quantity of the middle layer electrode, and the eighth difference between the misalignment quantity of the middle layer electrode and the misalignment quantity of the outermost electrode are calculated; the ninth difference between the misalignment quantity of the electrode at 1 / 4 and the misalignment quantity of the innermost electrode, and the tenth difference between the misalignment quantity of the electrode at 3 / 4 and the misalignment quantity of the outermost electrode are calculated; if the fifth, sixth, seventh, and eighth differences are all greater than the fourth threshold, and the ninth and tenth differences are both less than the fifth threshold, the misalignment type of the electrode cluster is determined to be the third misalignment type.

[0020] In this way, the third type of misaligned pole ear clusters can be effectively captured, the analysis efficiency is high, the possibility of misjudgment is reduced, and the judgment results are more reliable.

[0021] In some embodiments, determining a second characteristic electrode from a plurality of electrodes included in an electrode cluster includes: determining the second characteristic electrode based on the outermost electrode, the innermost electrode, the middle electrode, the electrode located at 1 / 4 of the electrode cluster, and the electrode located at 3 / 4 of the electrode cluster.

[0022] In this way, the overall misalignment of the tab cluster can be determined based on the misalignment of the second characteristic tab, which greatly improves the calculation accuracy.

[0023] In some embodiments, determining the misalignment of the tab cluster based on the misalignment of the second feature tab includes: determining the misalignment of the tab cluster based on the misalignment of the second feature tab, the hierarchy of the second feature tab in the tab cluster, and the total number of tabs included in the tab cluster.

[0024] Thus, by determining the misalignment of the second characteristic tab, the hierarchy of the second characteristic tab in the tab cluster, and the total number of tabs included in the tab cluster, a misalignment amount that comprehensively considers the overall structure and degree of misalignment of the tab cluster can be obtained, and the calculation result is more reasonable and accurate.

[0025] In some embodiments, the misalignment of each tab is determined based on the rotation angle of the reference winding needle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the multiple tape lengths of the electrode sheets corresponding to the tab cluster, and the rotation angle of the corresponding winding needle. This includes: for each tab included in the tab cluster, performing the following steps respectively: determining the tape length of the tab based on the multiple tape lengths of the electrode sheets corresponding to the tab cluster and the rotation angle of the corresponding winding needle; and determining the misalignment of the tab based on the tape length of the tab and the reference tape length of the reference tab.

[0026] In this way, by comparing the actual travel length of each electrode with the reference travel length of the reference electrode, the misalignment of each electrode can be accurately quantified.

[0027] In some embodiments, determining the travel length of the electrode tab based on the multiple electrode travel lengths of the electrode corresponding to the electrode cluster and the corresponding winding needle rotation angle includes: determining a first winding needle rotation angle and a second winding needle rotation angle adjacent to a reference winding needle rotation angle from the multiple winding needle rotation angles; determining a compensation coefficient based on the reference winding needle rotation angle, the first winding needle rotation angle, and the second winding needle rotation angle; determining a first compensation amount for the electrode travel length based on the first electrode travel length corresponding to the first winding needle rotation angle, the second electrode travel length corresponding to the second winding needle rotation angle, and the compensation coefficient; and compensating the second electrode travel length based on the first compensation amount to obtain the travel length of the electrode tab.

[0028] In this way, the travel length of the electrode was corrected, making the calculation of the electrode misalignment more accurate.

[0029] In some embodiments, the second electrode strip length is compensated based on a first compensation amount to obtain the strip length of the tab, including: determining a second compensation amount based on the strip length of the innermost tab of the tab cluster and the reference strip length of the innermost reference tab of the reference tab cluster; and compensating the second electrode strip length based on the first compensation amount and the second compensation amount to obtain the strip length of the tab.

[0030] This avoids the impact of feed position fluctuations on the accuracy of the electrode belt length.

[0031] In some embodiments, based on the misalignment of the cathode tab cluster and the anode tab cluster, a first rotation angle is determined so that the winding needle needs to continue rotating from the preset feeding angle after the winding body is obtained. This includes: determining the tab misalignment of the winding body based on the average of the misalignment of the cathode tab cluster and the anode tab cluster; and determining the first rotation angle so that the winding needle needs to continue rotating from the preset feeding angle after the winding body is obtained based on the tab misalignment of the winding body.

[0032] Thus, by determining the average of the misalignment of the cathode tab cluster and the anode tab cluster, the tab misalignment of the wound body can be determined. This allows for a more reasonable determination of the first rotation angle by considering the misalignment of both the cathode and anode tab clusters, thereby more effectively improving the tab misalignment of the wound body.

[0033] In some embodiments, based on the tab misalignment of the wound body, a first rotation angle is determined so that the winding needle needs to continue rotating from the preset feeding angle after the wound body is obtained. This includes: determining the first rotation angle so that the winding needle needs to continue rotating from the preset feeding angle after the wound body is obtained based on the tab misalignment of the wound body and the radius of the wound body.

[0034] Thus, by taking the offset of the loop of the winding body as the arc length and the radius of the winding body as the radius, the angle that the winding needle needs to rotate, i.e. the first rotation angle, can be accurately calculated according to the arc length formula.

[0035] In some embodiments, the method further includes: after the wound body is unloaded from the winding needle, controlling the winding needle to rotate to a preset unloading angle.

[0036] In this way, after feeding, the needle can be controlled to rotate to the preset feeding angle, thereby restoring the needle to a fixed position and avoiding the problem of not being able to determine the position of the recess in subsequent work processes.

[0037] In some embodiments, the anode tab and the cathode tab are located on the same side or opposite sides of the winding.

[0038] In this way, regardless of whether the anode and cathode tabs are located on the same side or opposite side of the winding body, the tab misalignment of the pre-compressed winding body can be improved.

[0039] Secondly, this application provides a winding machine, comprising: a winding needle for winding an anode electrode, a first diaphragm, a cathode electrode, and a second diaphragm to form a winding body, the winding body including multiple tab clusters, the multiple tab clusters including anode tab clusters and cathode tab clusters, the anode electrode including multiple anode tabs, the multiple anode tabs forming an anode tab cluster after being stacked in multiple layers of anode electrodes in the winding body, the cathode electrode including multiple cathode tabs, the multiple cathode tabs forming a cathode tab cluster after being stacked in multiple layers of cathode electrodes in the winding body; and a data acquisition device electrically connected to a processor for acquiring the multiple electrode travel lengths of the anode electrode, the multiple electrode travel lengths of the cathode electrode, the angle of rotation of the winding needle corresponding to the multiple electrode travel lengths of the anode electrode, and the angle of rotation of the cathode electrode. The rotation angles of the winding needle corresponding to the lengths of multiple electrode strips are sent to the processor. The processor, for each tab cluster, determines the misalignment amount of each tab based on the rotation angle of the reference winding needle corresponding to the reference tab of the reference winding body, the reference strip length of the reference tab, the multiple electrode strip lengths of the tabs corresponding to the tab cluster, and their corresponding rotation angles of the winding needle. The processor determines the misalignment type of the tab cluster based on the misalignment amount of the tabs in the tab cluster. Based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster, the processor determines the misalignment amount of the tab cluster. Based on the misalignment amount of the cathode tab cluster and the misalignment amount of the anode tab cluster, the processor determines the first rotation angle at which the winding needle needs to continue rotating from the preset unloading angle after the winding body is obtained, so that the winding body can be unloaded from the winding needle.

[0040] In this way, after the winding body is obtained, the winding machine can control the winding needle to continue rotating at the first rotation angle, and then feed the material to the pre-pressing position for pre-pressing. This allows the winding body to be pre-pressed at a suitable angle, thereby improving the misalignment of the tabs of the pre-pressed winding body.

[0041] In some embodiments, the acquisition device includes: an anode guide roller, disposed upstream of the winding needle, for guiding the anode electrode sheet's tape travel; an anode acquisition device, electrically connected to the anode guide roller and the processor, for acquiring multiple tape travel lengths of the anode electrode sheet via the anode guide roller and sending the data to the processor; a cathode guide roller, disposed upstream of the winding needle, for guiding the cathode electrode sheet's tape travel; a cathode acquisition device, electrically connected to the cathode guide roller and the processor, for acquiring multiple tape travel lengths of the cathode electrode sheet via the cathode guide roller and sending the data to the processor; and an angle acquisition device, electrically connected to the winding needle and the processor, for acquiring the winding needle rotation angles corresponding to the multiple tape travel lengths of the anode electrode sheet and the winding needle rotation angles corresponding to the multiple tape travel lengths of the cathode electrode sheet, and sending the data to the processor.

[0042] In this way, by setting up anode acquisition devices and cathode acquisition devices for the anode and cathode rollers respectively, the tape lengths of the anode and cathode plates can be accurately collected, ensuring the accuracy and real-time nature of the data.

[0043] In some embodiments, the outer peripheral surface of the winding needle is provided with a recess; the winding machine also includes a feeding clamp needle for extending into the recess, and a rotation gap is provided between the feeding clamp needle and the winding needle in the circumferential direction of the winding needle; with the central axis of the winding needle as a reference, the central angle corresponding to the rotation gap is greater than or equal to the first rotation angle.

[0044] Thus, a rotation gap is set between the feeding clamp needle and the winding needle in the recess. The central angle corresponding to the rotation gap is greater than or equal to the first rotation angle. This ensures that even if the portion of the recess deviates from the initial aligned position of the feeding clamp needle after the winding needle continues to rotate the first rotation angle after the winding body, the feeding clamp needle can still smoothly extend into the recess based on the space provided by the rotation gap because the rotation gap is large enough.

[0045] In some embodiments, the winding machine further includes: an anode through-beam sensor, disposed between the anode feed roller and the winding needle, electrically connected to the anode acquisition device and the angle acquisition device; the anode through-beam sensor is used to send a trigger signal to the anode acquisition device and the angle acquisition device when the edge of the anode tab is detected, so as to trigger the anode acquisition device to acquire the length of the anode sheet travel and the angle acquisition device to acquire the angle of the winding needle rotation; and a cathode through-beam sensor, disposed between the cathode feed roller and the winding needle, electrically connected to the cathode acquisition device and the angle acquisition device; the cathode through-beam sensor is used to send a trigger signal to the cathode acquisition device and the angle acquisition device when the edge of the cathode tab is detected, so as to trigger the cathode acquisition device to acquire the length of the cathode sheet travel and the angle acquisition device to acquire the angle of the winding needle rotation.

[0046] In this way, the anode and cathode through-beam sensors can accurately trigger the acquisition by detecting the edge of the electrode tab, ensuring that the acquired electrode tape length and the angle of the winding needle rotation correspond precisely to the position of the electrode tab. This allows for more accurate acquisition of relevant data on the electrode tape length and the rotation of the winding needle, providing an accurate basis for subsequent calculations of the electrode tab misalignment.

[0047] In some embodiments, the processor is configured to: for each tab included in the tab cluster, perform the following steps respectively: determine the tape length of the tab based on the reference needle rotation angle corresponding to the reference tab of the reference winding body, the tape length of the multiple pole pieces of the tab cluster and the corresponding needle rotation angle; and determine the misalignment of the tab according to the tape length of the tab and the reference tape length of the reference tab.

[0048] In this way, by comparing the actual travel length of each electrode with the reference travel length of the reference electrode, the misalignment of each electrode can be accurately quantified.

[0049] In some embodiments, the processor is configured to: determine, from a plurality of needle rotation angles, a first needle rotation angle and a second needle rotation angle adjacent to a reference needle rotation angle; determine a compensation coefficient based on the reference needle rotation angle, the first needle rotation angle, and the second needle rotation angle; determine a first compensation amount for the electrode travel length based on the first electrode travel length corresponding to the first needle rotation angle, the second electrode travel length corresponding to the second needle rotation angle, and the compensation coefficient; and compensate the second electrode travel length based on the first compensation amount to obtain the travel length of the electrode tab.

[0050] In this way, the travel length of the electrode was corrected, making the calculation of the electrode misalignment more accurate.

[0051] In some embodiments, the processor is configured to: determine a second compensation amount based on the travel length of the innermost tab of the tab cluster and the reference travel length of the innermost reference tab of the reference tab cluster; and compensate the travel length of the second electrode based on the first compensation amount and the second compensation amount to obtain the travel length of the tab.

[0052] This further avoids the impact of feed position fluctuations on the accuracy of the electrode belt length.

[0053] In some embodiments, the processor is a host computer, and the winding machine further includes a slave computer, which is electrically connected to the host computer and is used to receive a first rotation angle sent by the host computer and control the winding needle to continue rotating from a preset feeding angle based on the first rotation angle.

[0054] In this way, the processor, as the control center, coordinates the timing logic of various acquisition devices, sensors and lower-level machines, ensuring the precise execution of the winding process. Attached Figure Description

[0055] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0056] Figure 1a This is a schematic diagram of the pre-compression effect of a reference winding body according to an embodiment of this application;

[0057] Figure 1b This is a schematic diagram of the pre-compression effect of a single-sided misaligned winding body according to an embodiment of this application;

[0058] Figure 1c This is a schematic diagram of the pre-compression effect of the winding body with feed position deviation according to an embodiment of this application;

[0059] Figure 2 This is one of the structural schematic diagrams of a winding machine according to an embodiment of this application;

[0060] Figure 3 This is a schematic diagram of the winding needle operation position according to an embodiment of this application;

[0061] Figure 4 This is a schematic diagram comparing the material feeding angles according to an embodiment of this application;

[0062] Figure 5 This is a second schematic diagram of the structure of a winding machine according to an embodiment of this application;

[0063] Figure 6 This is a schematic diagram of the winding process of a winding machine according to an embodiment of this application;

[0064] Figure 7 This is a cross-sectional schematic diagram of a coiling needle according to an embodiment of this application;

[0065] Figure 8 This is the third schematic diagram of the structure of a winding machine according to an embodiment of this application;

[0066] Figure 9 This is the fourth schematic diagram of the structure of a winding machine according to an embodiment of this application;

[0067] Figure 10 This is a schematic flowchart of a winding method according to an embodiment of this application;

[0068] Figure 11a This is a schematic diagram of a first misaligned type of tab cluster according to an embodiment of this application;

[0069] Figure 11b This is a schematic diagram of a second misaligned type of electrode cluster according to an embodiment of this application;

[0070] Figure 11c This is a schematic diagram of a third misaligned type of electrode cluster according to an embodiment of this application;

[0071] Figure 12 This is a second schematic flowchart of a winding method according to an embodiment of this application;

[0072] Figure 13 This is a third schematic flowchart of a winding method according to an embodiment of this application;

[0073] Figure 14 This is a fourth schematic flowchart of a winding method according to an embodiment of this application;

[0074] Figure 15 This is the fifth schematic flowchart of a winding method according to an embodiment of this application;

[0075] Figure 16 This is a schematic flowchart of a winding method according to an embodiment of this application (Sixth).

[0076] Figure 17 This is the seventh schematic flowchart of a winding method according to an embodiment of this application;

[0077] Figure 18 This is the eighth schematic flowchart of a winding method according to an embodiment of this application;

[0078] Figure 19 This is a schematic flowchart of a winding method according to an embodiment of this application (number nine).

[0079] Figure 20 This is a schematic flowchart of a winding method according to an embodiment of this application.

[0080] Figure 21 This is eleventh of a flowchart illustrating a winding method according to an embodiment of this application.

[0081] The accompanying drawings are not necessarily drawn to scale. Detailed Implementation

[0082] 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.

[0083] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0084] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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).

[0091] 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.

[0092] Currently, with the development of battery technology, users have increasingly higher requirements for battery quality.

[0093] In battery production, the manufacturing quality of the battery cells is crucial. The production of battery cells involves processes such as winding, pre-pressing, and cold pressing. Among these, the winding process has a significant impact on the quality of the battery cells. Misalignment of the electrode tabs can occur during winding, thereby affecting the reliability of the battery.

[0094] During the winding process, misalignment of the electrode tabs can cause several problems. For example, in cell production, if the electrode sheets fail to align accurately with the preset position when entering the winding machine, misalignment of the electrode tabs will occur in the wound body. This misalignment will prevent the wound body from meeting process requirements in subsequent processes (such as pre-pressing), causing the tabs to exceed the allowable misalignment range, thus resulting in a defective cell. Even if the electrode sheets enter the winding machine at the normal feeding position, electrode tab misalignment may still occur. To solve the misalignment problem, some processes use a kneading method for correction. However, this method has hidden dangers. During the kneading process, the internal structure of the cell is easily damaged, resulting in wrinkling and disrupting the uniformity of the internal materials, thereby affecting the conductivity and stability of the cell. Simultaneously, it may also lead to decarburization of the electrode materials, reducing the cell's capacity and charge / discharge performance, affecting the cell's quality and lifespan.

[0095] According to the battery cell manufacturing process, after the winding body is unloaded from the winding needle and placed at the pre-pressing position, it undergoes pre-pressing. Research has found that the placement angle of the winding body during pre-pressing affects the final electrode misalignment of the battery cell. Therefore, the electrode misalignment of the battery cell can be improved by changing the placement angle of the winding body at the pre-pressing position. This placement angle can be controlled by changing the unloading angle of the winding body when it is unloaded from the winding needle. The magnitude of the unloading angle can be determined based on the misalignment of the electrode clusters within the winding body. In other words, different unloading angles for different degrees of electrode cluster misalignment have a significant impact on the final electrode misalignment of the battery cell.

[0096] Further research revealed that when the misalignment of the tabs within a tab cluster exhibits different characteristics, the overall misalignment of the tab cluster manifests differently, and the calculation method for the overall misalignment of the tab cluster is related to the overall misalignment manifestation. Therefore, tab clusters exhibiting different characteristics of tab misalignment can be classified into different misalignment types based on their overall misalignment manifestation, allowing for accurate determination of the misalignment amount of the tab cluster through its misalignment type.

[0097] In view of this, this application provides a winding method and a winding machine that, for each tab cluster of the wound body generated by winding, determines the misalignment amount of each tab based on the reference needle rotation angle corresponding to the reference tab of the reference wound body, the reference tape length of the reference tab, the tape lengths of multiple electrodes corresponding to the tab cluster, and the corresponding needle rotation angle. Based on the misalignment amount of the tabs in the tab cluster, the misalignment type of the tab cluster is determined. Based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster, the misalignment amount of the tab cluster is determined. Based on the misalignment amounts of the cathode tab cluster and the anode tab cluster, a first rotation angle is determined from which the needle needs to continue rotating from a preset feeding angle after the wound body is obtained, so that the wound body can be fed from the needle. In this way, after obtaining the wound body, the needle can be controlled to continue rotating at this first rotation angle before feeding to the pre-pressing position for pre-pressing. This allows for pre-pressing of the wound body at a suitable angle, improving the tab misalignment of the pre-pressed wound body.

[0098] For example, such as Figures 1a-1c The diagram shows the pre-compression effect of the wound body.

[0099] Figure 1a A schematic diagram illustrating the pre-compression effect of a reference wound is shown. The reference wound can be understood as a standard wound in an ideal state. For example... Figure 1a The reference wound body 102 shown, after pre-compression, did not exhibit any electrode misalignment in the tab clusters 180 within the wound body 102. Figure 1a In the process, when the reference winding body 102 is unloaded from the winding needle 120, it is located at a preset unloading angle, which is a fixed unloading angle set in advance. Since there is no misalignment of the electrode tabs, the reference winding body 102 is unloaded at the preset angle, and pre-pressing at the pre-pressing position can produce a normal battery cell.

[0100] Figure 1b A schematic diagram illustrating the pre-compression effect of a unilaterally misaligned wound body is shown. Unilateral misalignment refers to the misalignment of the tabs in the tab cluster in a certain direction. For example... Figure 1b The single-sided misaligned winding body 106 shown, before the feeding angle was improved, was located at a preset feeding angle when the reference winding body 106 was fed from the winding needle 120. After pre-pressing, the misalignment of the tab cluster 182 in the single-sided misaligned winding body 106 exceeded the threshold range. Figure 1bThe misalignment of the tab cluster 182 in the single-sided misaligned winding body 106 is indicated by the misalignment range mark 184. It can be seen that if the single-sided misaligned winding body 106 is cut at a preset cutting angle and pre-pressed at the pre-pressing position, it will produce unqualified battery cells.

[0101] Figure 1c This diagram illustrates the pre-compression effect of a wound body with feed position deviation. If feed position deviation occurs in the wound body, the entire tab cluster is misaligned, and the resulting wound body will resemble... Figure 1c The feed position deviation of the wound body 110 is shown. For example... Figure 1b The feed position deviation winding 110 shown, before the feed angle was improved, was located at a preset feed angle when it was fed from the winding needle 120. Due to the overall misalignment of the tab clusters in the feed position deviation winding 110, after pre-compression, the distance between the tab clusters 186 and the edge of the winding body in the feed position deviation winding 110 exceeded the threshold range. Figure 1c The misalignment of the tab cluster 186 in the feed position deviation winding body 110 is indicated by the misalignment range mark 188. It can be seen that if the feed position deviation winding body 110 is fed at a preset feeding angle, it will produce unqualified battery cells.

[0102] against Figure 1b and Figure 1c The illustrated winding body exhibits misalignment. According to the winding method provided in this application embodiment, a first rotation angle can be determined after obtaining the winding body, from which the winding needle needs to continue rotating from the preset unloading angle. The winding needle 120 is controlled to continue rotating from the first rotation angle to the improved unloading angle, thereby improving the unloading angle of the misaligned winding body and ensuring that the pre-pressed tab misalignment is within a threshold range. For... Figure 1b The single-sided misaligned winding body 106, after the winding needle 120 continues to rotate from the preset feeding angle to the first rotation angle, forms Figure 1b The single-sided misaligned winding body 106 shown has an improved cutting angle. Subsequent pre-pressing ensures that the pre-pressed electrode misalignment is within a threshold range, thus producing a normal battery cell. (This is in response to...) Figure 1c The feed position deviation of the winding body 110, the winding needle 120 continues to rotate from the preset feeding angle to the first rotation angle, forming Figure 1c The feed angle of the winding body 110 after the feed position deviation is improved, and then the feed body is pre-pressed, so that the misalignment of the electrode after pre-pressing is within the threshold range, thus producing a normal battery cell.

[0103] The winding method and winding machine provided in the embodiments of this application will be described in detail below.

[0104] Figure 2 This is a schematic diagram of the structure of a winding machine provided in some embodiments of this application.

[0105] like Figure 2As shown, the winding machine 200 may include: winding needle 210, collection device 220, and processor 230.

[0106] Among them, the winding needle 210 is used to wind the anode electrode 290, the first diaphragm 292, the cathode electrode 294 and the second diaphragm 296 to form a wound body 280.

[0107] The wound body 280 includes multiple tab clusters, including an anode tab cluster 281 and a cathode tab cluster 282. The anode electrode 290 includes multiple anode tabs, which form an anode tab cluster 281 after being stacked in multiple layers of anode electrodes in the wound body 280. The cathode electrode 294 includes multiple cathode tabs, which form a cathode tab cluster 282 after being stacked in multiple layers of cathode electrodes in the wound body 280.

[0108] The coil needle 210 can be any type of coil needle. For example, the surface of the coil needle 210 can be a smooth surface, an anti-stick coating surface, or a textured surface.

[0109] The acquisition device 220, which is electrically connected to the processor 230, is used to acquire the multiple electrode travel lengths of the anode electrode 290, the multiple electrode travel lengths of the cathode electrode 294, the rotation angle of the winding needle corresponding to the multiple electrode travel lengths of the anode electrode 290, and the rotation angle of the winding needle corresponding to the multiple electrode travel lengths of the cathode electrode 294, and send the data to the processor 230.

[0110] In practical applications, the data acquisition device 220 can manifest as one or more devices. For example... Figure 2 In the diagram, the data acquisition device 220 is illustrated by including two devices.

[0111] The data acquisition device 220 is used to acquire data such as the length of multiple electrode tapes and the rotation angle of the winding needle, and send this data to the processor. The data acquisition device 220 can be implemented using various types of sensors. For example, the data acquisition device 220 may include: a photoelectric encoder, a laser sensor, a displacement sensor, etc. In some embodiments, the data acquisition device 220 may be positioned between the winding needle 210 and the guide roller 298, that is, at the position where the electrode is about to enter the winding needle 210. In other embodiments, the data acquisition device 220 may be positioned on the side of the guide roller 298 away from the winding needle 210. The data transmission between the data acquisition device 220 and the processor 230 can be wired or wireless.

[0112] The processor 230 is configured to, for each tab cluster, determine the misalignment amount of each tab based on the reference needle rotation angle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the tape length of multiple electrodes corresponding to the tab cluster, and the corresponding needle rotation angle; determine the misalignment type of the tab cluster based on the misalignment amount of the tabs in the tab cluster; determine the misalignment amount of the tab cluster based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster; and determine the first rotation angle at which the needle needs to continue rotating from the preset feeding angle after the winding body is obtained, so that the winding body 280 can be fed from the needle 210, based on the misalignment amount of the cathode tab cluster and the anode tab cluster.

[0113] The angle that the winding needle has rotated can be the cumulative angle that the winding needle 210 has rotated since the start of winding.

[0114] The processor 230 can be a host computer or a slave computer, etc.

[0115] The processor 230 can receive and process data from the acquisition device 220 in real time, meeting the real-time control requirements of the winding machine 200.

[0116] In this embodiment, the reference winding can be understood as an ideal standard winding. The reference tape length of each reference tab of the reference winding can be considered as a standard, misaligned tape length, and parameters such as the reference tape length and the reference winding needle rotation angle all meet the requirements. By comparing the actual winding formed by the winding machine 200 with the reference winding, and analyzing the differences between the two in terms of electrode tape length, the tab misalignment of the actual winding can be determined. The reference winding needle rotation angle can be understood as the cumulative angle that the winding needle used in the standard winding process has rotated since the start of winding. The reference winding needle rotation angle is related to the formation of the reference winding and corresponds to the standard tape length of the tab, that is, the reference tape length of the tab. Thus, by comparing the actual winding needle rotation angle and the reference winding needle rotation angle of the winding machine 200, and combining the difference between the actual tape length and the reference tape length of the electrode, the amount of tab misalignment can be calculated.

[0117] Therefore, the winding machine 200 provided in this embodiment can determine the misalignment amount of each tab cluster based on the reference needle rotation angle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the tape length of multiple electrodes corresponding to the tab cluster, and the corresponding needle rotation angle. It then determines the misalignment type of the tab cluster based on the misalignment amount of the tabs in the tab cluster, and further determines the misalignment amount of the tab cluster based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster. Finally, based on the misalignment amounts of the cathode tab cluster and the anode tab cluster, it determines a first rotation angle at which the needle needs to continue rotating from the preset feeding angle after obtaining the winding body, so that the winding body can be fed from the needle. In this way, after obtaining the winding body, the needle can be controlled to continue rotating at this first rotation angle before feeding to the pre-pressing position for pre-pressing. This allows for pre-pressing of the winding body at a suitable angle, improving the tab misalignment situation of the pre-pressed winding body.

[0118] For example, such as Figure 3 The diagram shows the operating positions of the winding needle. These positions include: winding position 302, adhesive application position 304, and unloading position 306. Specifically, at the winding position, the winding needle of the winding machine winds the anode sheet, the first diaphragm, the cathode sheet, and the second diaphragm to form a wound body. Afterward, the wound body is moved to the adhesive application position, where adhesive material is applied to the wound body to fix and protect it, preventing it from loosening. After adhesive application, the wound body reaches the unloading position, where the unloading clamping needle of the winding machine enters the recess of the winding needle to position and clamp the wound body, unloading it accurately and stably.

[0119] During the above operations, such as Figure 4 The diagram shows a comparison of the feeding angles before and after the improvement. The wound body 410 reaches the feeding position at the preset feeding angle and is ready to be fed. At this point, if there is misalignment of the electrode tabs, the winding needle 412 can be controlled to continue rotating from the feeding position at the preset feeding angle by a first rotation angle until the improved feeding angle is reached. After feeding at the improved feeding angle, the wound body 410 is pre-compressed to improve the misalignment of the electrode tabs in the pre-compressed wound body.

[0120] Figure 5 This is a schematic diagram of the structure of a winding machine provided in some embodiments of this application. Figure 5 The dashed line in the middle represents the electrical connection.

[0121] like Figure 5 As shown, the data acquisition device 220 may include:

[0122] The anode roller 2201 is located upstream of the winding needle 210 and is used to guide the anode sheet on the conveyor belt.

[0123] The anode acquisition device 2202 is electrically connected to the anode roller 2201 and the processor 230. The anode acquisition device 2202 is used to acquire the length of multiple anode plates through the anode roller 2201 and send it to the processor 230.

[0124] The cathode roller 2203 is located upstream of the winding needle 210 and is used to guide the cathode electrode sheet on the conveyor belt.

[0125] The cathode acquisition device 2204 is electrically connected to the cathode roller 2203 and the processor 230. The cathode acquisition device 2204 is used to acquire the length of multiple cathode electrode strips through the cathode roller 2203 and send it to the processor 230.

[0126] In this embodiment, the anode roller 2201 and the cathode roller 2203 can rotate as the electrode moves during the electrode's conveyor belt movement by contacting the electrode sheet. The number of rotations of the anode roller 2201 and the cathode roller 2203 corresponds to the length of the electrode conveyor belt.

[0127] In some embodiments, the anode acquisition device and the cathode acquisition device may be represented as a photoelectric encoder or a displacement sensor, etc.

[0128] Angle acquisition device 2205 is electrically connected to the winding needle 210 and the processor 230. The angle acquisition device 2205 is used to acquire the winding needle rotation angle corresponding to the multiple electrode travel lengths of the anode electrode 290 and the winding needle rotation angle corresponding to the multiple electrode travel lengths of the cathode electrode 294, and send them to the processor 230.

[0129] In some embodiments, the angle acquisition device 2205 may be a rotary encoder or a rotary transformer. A rotary encoder converts the mechanical rotation of the winding needle into a digital signal output, accurately measuring the angle of rotation of the winding needle. A rotary transformer uses the principle of electromagnetic induction to convert the rotation angle of the winding needle into an electrical signal, which is output to a processor to obtain the angle of rotation of the winding needle corresponding to the length of the electrode feed.

[0130] For example, assuming the circumference of the anode roller is 10cm, when the anode plate drives the anode roller to rotate 5 times, the anode acquisition device detects that the mark point on the anode roller has moved 5 times through the encoder. Based on the relationship between the circumference and the number of rotations, the length of the anode plate can be calculated to be 50cm, and the data is sent to the processor 230.

[0131] As another example, suppose the angle acquisition device 2205 is implemented using a rotary encoder. When the winding needle 210 rotates, the rotary encoder converts its rotation angle into a pulse signal, such as generating 10 pulses for every 1 degree of rotation. When 50 pulses are detected, the rotary encoder can calculate that the winding needle has rotated 5 degrees and send this data to the processor 230.

[0132] In this embodiment, by setting an anode acquisition device 2202 and a cathode acquisition device 2204 for the anode roller 2201 and cathode roller 2203 respectively, the belt lengths of the anode electrode 290 and cathode electrode 294 can be accurately collected, ensuring the accuracy and real-time nature of the data.

[0133] For example, such as Figure 6 The diagram shows a schematic of the winding process of a winding machine. The winding process includes: the anode electrode 650, the first diaphragm 652, the cathode electrode 654, and the second diaphragm 656 being guided and conveyed by rollers at their respective turning positions 610 on their transport paths; optionally, they can also be corrected by components such as a correction sensor (not shown in the diagram); then, the anode electrode 650, the first diaphragm 652, the cathode electrode 654, and the second diaphragm 656 are guided and conveyed by rollers at their respective turning positions 620 on their transport paths; optionally, the tension during the conveying process can also be adjusted by components such as a tension measuring roller (not shown in the diagram); finally, the anode electrode... Anode sheet 650, first diaphragm 652, cathode sheet 654, and second diaphragm 656 are guided and conveyed by rollers at turning positions 630 on their respective conveying paths. Optionally, they can also pass through components such as magnetic rods and length measuring rollers (not shown in the figure) to perform operations such as tension fine-tuning and length measurement on the material. Subsequently, anode sheet 650, first diaphragm 652, cathode sheet 654, and second diaphragm 656 are guided and conveyed by rollers at turning positions 640 on their respective conveying paths, approaching the winding needle located at winding position 66. The winding needle winds the material at winding position 660 to form a wound body. After the wound body is formed, it is glued at adhesive application position 670. After adhesive application, the wound body is unloaded at unloading position 680. Thus, Figure 6 In this embodiment, the anode roller can be set at the turning position 640 on the transmission path of the anode electrode, and the cathode roller can be set at the turning position 640 on the transmission path of the cathode electrode.

[0134] Figure 7 This is a cross-sectional schematic diagram of the coiling needle 210 provided in some embodiments of this application.

[0135] like Figure 7 The cross-section of the coil needle 210 is shown, and a recess 250 is provided on the outer peripheral surface of the coil needle 210.

[0136] Thus, the winding machine also includes a feeding clamp needle, which is used to extend into the recess 250. A rotational gap is provided between the feeding clamp needle and the winding needle 210, which are housed within the recess 250, in the circumferential direction of the winding needle 210. With the central axis of the winding needle 210 as a reference, the central angle corresponding to the rotational gap is greater than or equal to a first rotational angle.

[0137] Understandably, after obtaining the wound body, the winding needle needs to continue rotating from the preset unwinding angle by a first rotation angle. Then, a unwinding clamping needle needs to be inserted through the recess to clamp the wound body to another position. However, in related technologies, the recessed space on the outer circumference of the winding needle is usually small. After obtaining the wound body, the continued rotation of the winding needle by the first rotation angle causes a change in the position of the recessed space relative to the unwinding clamping needle, thus preventing the unwinding clamping needle from inserting smoothly.

[0138] Therefore, in this embodiment of the application, in order to enable the feeding clamp needle to smoothly extend into the recess, a rotation gap is set between the feeding clamp needle and the winding needle in the recess. The central angle corresponding to the rotation gap is greater than or equal to the first rotation angle. This allows the winding needle to continue rotating after the winding body has reached the first rotation angle. Even if part of the space in the recess deviates from the initial aligned position of the feeding clamp needle, the feeding clamp needle can still extend into the recess based on the space provided by the rotation gap because the rotation gap is large enough, thus enabling subsequent operations such as clamping the winding body.

[0139] For example, assuming the first rotation angle is 30°, and the central angle corresponding to the recessed space that just accommodates the feeding needle is 10°, a recess with appropriate depth and width can be machined on the outer circumferential surface of the coiling needle. The central angle corresponding to the rotation gap in the recess can be 40°, which satisfies the requirement of being greater than the first rotation angle.

[0140] Figure 8 This is a schematic diagram of the structure of a winding machine provided in some embodiments of this application.

[0141] like Figure 8 As shown, the winding machine 200 may also include:

[0142] An anode through-beam sensor 2208 is disposed between the anode roller 2201 and the winding needle 210, and is electrically connected to the anode acquisition device 2202 and the angle acquisition device 2205. The anode through-beam sensor 2208 is used to send a trigger signal to the anode acquisition device 2202 and the angle acquisition device 2205 when the edge of the anode electrode tab is detected, so as to trigger the anode acquisition device 2202 to acquire the electrode length of the anode electrode, and trigger the angle acquisition device 2205 to acquire the rotation angle of the winding needle.

[0143] A cathode-beam sensor 2209 is disposed between the cathode roller 2203 and the winding needle 210, and is electrically connected to the cathode acquisition device 2204 and the angle acquisition device 2205. The cathode-beam sensor 2209 is used to send a trigger signal to the cathode acquisition device 2204 and the angle acquisition device 2205 when the edge of the cathode electrode tab is detected, so as to trigger the cathode acquisition device 2204 to acquire the electrode length of the cathode electrode, and trigger the angle acquisition device 2205 to acquire the rotation angle of the winding needle.

[0144] Among them, the anode through-beam sensor 2208 and the cathode through-beam sensor 2209 are sensor devices that work based on the through-beam principle. They can accurately detect the position of the electrode tab edge during the electrode winding process, thereby triggering the acquisition device to collect data.

[0145] The placement of the anode through-beam sensor 2208 and the cathode through-beam sensor 2209 can be implemented in various ways. In some embodiments, the anode through-beam sensor 2208 can be placed between the anode roller 2201 and the winding needle 210, as close as possible to the winding needle 210. This reduces the time and distance error from detecting the edge of the electrode tab to the electrode tab entering the winding needle, thus improving the accuracy of the acquired data. In other embodiments, the anode through-beam sensor 2208 can be placed between the anode roller 2201 and the winding needle 210, with the transmitting and receiving ends set at a certain angle (e.g., between 30° and 60°) to the direction of the anode electrode's movement. This increases the dwell time of the electrode tab edge within the detection area, improving the reliability of the detection. The cathode through-beam sensor 2209 is similar and will not be described further here. The electrical connection in this embodiment can be wired or wireless. In the case of a wired connection, the electrical connection can be achieved through conductive components such as wires or connectors.

[0146] The trigger signals sent by the anode through-beam sensor 2208 and the cathode through-beam sensor 2209 can be analog signals or digital signals.

[0147] For example, the operation of the anode through-beam sensor 2208 includes: when the anode through-beam sensor 2208 detects the edge of the tab of the first anode electrode, it triggers the anode acquisition device 2202 to acquire the tape length of the anode electrode, and simultaneously triggers the angle acquisition device 2205 to acquire the rotation angle of the winding needle; as the winding needle rotates, when the anode through-beam sensor 2208 detects the edge of the tab of the second anode electrode, it again triggers the anode acquisition device 2202 and the angle acquisition device 2205 to acquire data; through multiple acquisitions, the tape length of multiple anode electrodes and the rotation angle of the winding needle can be obtained. The operation of the cathode through-beam sensor 2209 is similar and will not be described in detail here.

[0148] Since the edge of the electrode tab is a key position marker during the electrode travel process, the anode through-beam sensor 2208 and cathode through-beam sensor 2209 in this embodiment can accurately trigger the acquisition by detecting the edge of the electrode tab. This ensures that the acquired electrode travel length and the angle of the winding needle rotation correspond precisely to the position of the electrode tab, thereby obtaining more accurate data on the electrode travel length and the rotation of the winding needle, providing an accurate basis for subsequent calculations of the electrode tab misalignment.

[0149] In some embodiments of this application, the processor 230 is used for:

[0150] For each electrode in the electrode cluster, perform the following steps:

[0151] The length of the electrode strip is determined based on the rotation angle of the reference needle corresponding to the reference electrode tab of the reference winding body, the multiple electrode strip lengths of the electrode strips corresponding to the electrode tab cluster, and the rotation angle of the corresponding needle.

[0152] The misalignment of the electrode is determined based on the travel length of the electrode tab and the reference travel length of the reference electrode tab.

[0153] This embodiment can accurately quantify the misalignment of each electrode by comparing the actual travel length of each electrode with the reference travel length of the reference electrode.

[0154] In some embodiments of this application, the processor 230 is used for:

[0155] From multiple angles in which the needle has rotated, determine the first and second angles in which the needle has rotated adjacent to the reference angle in which the needle has rotated.

[0156] The compensation coefficient is determined based on the reference needle rotation angle, the first needle rotation angle, and the second needle rotation angle.

[0157] Based on the first electrode travel length corresponding to the first winding needle rotation angle, the second electrode travel length corresponding to the second winding needle rotation angle, and the compensation coefficient, the first compensation amount for the electrode travel length is determined.

[0158] The length of the second electrode is obtained by compensating for the length of the second electrode based on the first compensation amount.

[0159] This embodiment modifies the travel length of the electrode tab, thereby making the calculation of the electrode tab misalignment more accurate.

[0160] In some embodiments of this application, the processor 230 is used for:

[0161] The second compensation amount is determined based on the travel length of the innermost electrode of the electrode cluster and the reference travel length of the innermost reference electrode of the reference electrode cluster.

[0162] Based on the first and second compensation amounts, the travel length of the second electrode is compensated to obtain the travel length of the electrode tab.

[0163] The processor 230 can be implemented as a controller in various ways.

[0164] Figure 9 This is a schematic diagram of the structure of a winding machine 200 provided in some embodiments of this application.

[0165] like Figure 9 As shown, processor 230 is the host computer, and winding machine 200 also includes:

[0166] The lower-level machine 260 is electrically connected to the upper-level machine and is used to receive the first rotation angle sent by the upper-level machine, and control the winding needle to continue rotating from the preset feeding angle based on the first rotation angle.

[0167] For example, the processor 230, acting as the host computer, calculates the first rotation angle by which the winding needle needs to continue rotating from the preset unloading angle. Then, it sends this first rotation angle to the slave computer 260 via a communication interface, such as a serial port, Ethernet, or industrial bus. The slave computer 260 can receive the first rotation angle sent by the host computer through a preset communication protocol, parse it into a control signal for the winding needle, and control the winding needle to rotate precisely, ensuring that the winding needle continues rotating from the preset unloading angle to complete the first rotation angle.

[0168] In some embodiments, the lower-level machine can be represented as a Programmable Logic Controller (PLC). A PLC is a digital computing electronic system used in industrial environments. It executes logic control, sequential operation, timing / counting, and arithmetic operation instructions through programmable memory to achieve automated control of mechanical equipment and production processes.

[0169] In addition, the lower-level computer can also feed back the execution status to the upper-level computer, such as rotation completion signal and abnormal alarm signal light, to form a closed-loop control.

[0170] In this embodiment, the processor 230 acts as the control center, coordinating the timing logic of various acquisition devices, sensors, and lower-level machines to ensure the precise execution of the winding process.

[0171] In other embodiments of this application, the automated control system of the multi-winding machine includes an industrial computer and multiple PLCs, with each winding machine having its own PLC. The PLC receives control instructions from the industrial computer and executes specific control tasks. In this embodiment, the processor 430 of the winding machine can be represented as a PLC. After calculating the first rotation angle that the winding needle needs to continue rotating from the preset feeding angle, it can directly control the winding needle to continue rotating from the preset feeding angle to complete the first rotation angle.

[0172] Based on the winding machine provided in the above embodiments, this application also provides embodiments of the winding method.

[0173] Figure 10This is a schematic flowchart of a winding method provided in some embodiments of this application. The winding method involves winding a pin around an anode sheet, a first diaphragm, a cathode sheet, and a second diaphragm to form a wound body. The wound body includes multiple tab clusters, which include anode tab clusters and cathode tab clusters. The anode sheet includes multiple anode tabs, which form anode tab clusters after being stacked in multiple layers of the wound body. The cathode sheet includes multiple cathode tabs, which form cathode tab clusters after being stacked in multiple layers of the wound body.

[0174] like Figure 10 As shown, the winding method may include the following steps:

[0175] S1010, for each tab cluster, based on the reference needle rotation angle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the multiple tape lengths of the electrode sheets corresponding to the tab cluster and their corresponding needle rotation angles, determine the misalignment amount of each tab.

[0176] The reference winding is a standard winding in an ideal state. The reference tape length of each reference tab of the reference winding can be regarded as a standard, misaligned tape length, and parameters such as the reference tape length and the rotation angle of the reference winding needle all meet the requirements. For example, the reference winding can be characterized as follows: Figure 1a The reference winding 102 is shown. The feed position of the reference winding is normal, the tabs are not misaligned, and normal battery cells can be produced.

[0177] By comparing the actual wound body with a reference wound body and analyzing the differences between them in aspects such as electrode travel length, the electrode tab misalignment of the actual wound body can be determined. The reference winding needle rotation angle can be understood as the cumulative rotation angle of the winding needle used in the standard winding process. The reference winding needle rotation angle is related to the formation of the reference wound body, and corresponds to the standard travel length of the electrode and the standard position of the electrode tab. Thus, by comparing the actual and reference winding needle rotation angles of the winding machine, and combining this with the difference between the actual and reference travel lengths of the electrode, the electrode tab misalignment can be calculated.

[0178] The misalignment of the electrode tab is used to characterize the degree of deviation between the actual position of the electrode tab (i.e., the length of the electrode tab's travel) and the ideal position (i.e., the reference length of the reference electrode tab of the reference winding body). It can be obtained by comparing parameters such as the electrode travel length and the rotation angle of the winding needle with the relevant parameters of the reference winding body, reflecting the positional shift of the electrode tab during the winding process.

[0179] In some embodiments, the misalignment of each tab can be calculated; in another embodiment, the misalignment of tabs that meet specified characteristics can be calculated.

[0180] In this step, the misalignment of each tab in the anode tab cluster can be determined for the anode tab cluster, and the misalignment of each tab in the cathode tab cluster can be determined for the cathode tab cluster.

[0181] S1020, determine the misalignment type of the electrode cluster based on the amount of misalignment of the electrodes in the electrode cluster.

[0182] The misalignment type of the tab cluster can be determined based on the characteristics of the misalignment amount of the tabs in the tab cluster, and is used to generally describe the overall misalignment manifestation of the tab cluster.

[0183] In some embodiments, the misalignment type of the tab cluster can be determined based on the misalignment amount of each tab. In other embodiments, the misalignment type of the tab cluster can be determined based on the misalignment amount of tabs with specified characteristics.

[0184] Different misalignment types characterize different overall misalignment manifestations of the tab clusters and have different misalignment meanings. In some embodiments, the misalignment types of the tab clusters may include: a first misalignment type, a second misalignment type, and a third misalignment type.

[0185] The first misalignment type is used to characterize the poles in the pole cluster being misaligned in a certain direction, and can also be called the unilateral misalignment type. More specifically, the unilateral misalignment type can be understood as the outer pole of the pole cluster being misaligned relative to the inner pole in a direction opposite to the winding direction, or the outer pole of the pole cluster being misaligned relative to the inner pole in the winding direction.

[0186] When the tabs in the tab cluster are misaligned in a certain direction, it indicates that there is a continuous accumulation of deviation during the winding process. Based on this continuous accumulation of deviation, the misalignment amount of the outermost tabs in the tab cluster will differ significantly from that of the innermost tabs. Therefore, based on this characteristic, the first type of misalignment can be identified.

[0187] Specifically, such as Figure 11a This is a schematic diagram of a first misaligned type of tab cluster provided in some embodiments of this application. For example... Figure 11a As shown, for the multi-layered tabs 1101 of the first misaligned type of tab cluster, except for the innermost tab, the other tabs are all misaligned in one direction relative to the innermost tab. Furthermore, in the order of the number of layers from the inside to the outside, the degree of offset between these tabs and the innermost tab gradually increases, forming a single-sided misaligned type of tab cluster.

[0188] The second misalignment type is used to characterize a significant misalignment between the middle layer tabs and the innermost and outermost tabs in a tab cluster, also known as a U-shaped misalignment type. This misalignment type can be understood as follows: the side of the tab cluster facing the other tab cluster in the winding body has a central depression or convexity. Because the middle layer tabs in this misalignment type exhibit a significant misalignment relative to the innermost and outermost tabs, the difference in misalignment between the middle layer tabs and the innermost and outermost tabs is relatively large, while the difference in misalignment between the innermost and outermost tabs is relatively small. Therefore, based on this characteristic, the second misalignment type can be identified.

[0189] An intermediate layer tab refers to a tab in a tab cluster whose relative position to the outermost and innermost tabs satisfies a preset condition for determining an intermediate tab. This preset condition can be implemented in various ways, such as having the same number of tab layers as or greater than a certain number of tab layers between it and the outermost and innermost tabs. An intermediate layer tab is typically a single tab, but in some cases, it can consist of multiple tabs.

[0190] Specifically, such as Figure 11b This is a schematic diagram of a second misaligned type of tab cluster provided in some embodiments of this application. For example... Figure 11b As shown, for the multilayer tabs 1101 of the second misaligned type of tab cluster, compared with the tabs of the middle layer, the remaining tabs on both sides are misaligned in one direction relative to the tabs of the middle layer, forming a U-shaped misalignment type.

[0191] The third type of misalignment is characterized by significant misalignment differences between the tabs at different positions (e.g., the outermost layer, the innermost layer, the outer 1 / 4, and the 3 / 4 from the innermost point) and the middle layer tabs within the tab cluster. These tabs are affected differently during winding compared to the middle layer tabs, resulting in substantial differences in misalignment. Furthermore, the misalignment difference between the outermost and 3 / 4 point tabs, and between the innermost and 1 / 4 point tabs, is relatively small; this can also be termed an S-shaped misalignment type. Based on this characteristic, the third type of misalignment can be identified. This misalignment type can be understood as follows: the side of the tab cluster facing the other tab cluster of the winding body comprises two parts, one with a central concave portion and the other with a central convex portion.

[0192] Specifically, Figure 11c This is a schematic diagram of a third misaligned type of tab cluster provided in some embodiments of this application. For example... Figure 11cAs shown, for the multi-layered tabs 1101 of the third misalignment type of tab cluster, starting from the innermost tab, as the number of layers increases from the inside out, each tab will initially shift in one direction, with the degree of shift gradually increasing compared to the innermost tab, until it reaches approximately 1 / 4 of the tab cluster. From 1 / 4 of the tab cluster, as the number of layers continues to increase, each tab will begin to shift in another direction, with the degree of shift gradually increasing compared to the tab at 1 / 4, until it reaches approximately 3 / 4 of the tab cluster. Then, starting from the tab at 3 / 4 of the tab cluster, as the number of layers increases from the inside out, each tab will shift in the first direction again, until it reaches the outermost layer, forming an S-shaped misalignment type.

[0193] It should be noted that, Figures 11a to 11c The examples listed here are merely for illustrative purposes. In practical applications, the specific number of electrode layers, the magnitude of the electrode misalignment in each layer, and the direction of the electrode offset from the inside out are not specifically limited and should be determined based on the actual situation. In practical applications, due to the different overall misalignment patterns of the electrode clusters, the misalignment types can be diverse. Besides the first, second, and third misalignment types mentioned above, other misalignment types are also possible. Different misalignment types can be determined by the different characteristics exhibited by the amount of electrode misalignment in the electrode cluster. These other misalignment types will not be listed here.

[0194] In this step, the misalignment type of the anode tab cluster can be determined for the anode tab cluster, and the misalignment type of the cathode tab cluster can be determined for the cathode tab cluster.

[0195] S1030, determine the misalignment amount of the electrode cluster based on the misalignment amount of the electrode cluster and the misalignment type of the electrode cluster.

[0196] In step S1030, the type of misalignment of the tab cluster helps to determine the calculation method of the overall misalignment of the tab cluster, thereby more accurately calculating the overall misalignment of the tab cluster.

[0197] The degree of misalignment of the tab cluster is determined by the degree of misalignment of the tabs in the tab cluster and the type of misalignment of the tab cluster, and is used to characterize the overall degree of misalignment of the tab cluster.

[0198] Understandably, the misalignment type of the tab cluster characterizes the overall misalignment pattern of the tab cluster, and different misalignment types indicate that the misalignment of the tabs within the tab cluster follows different patterns. Therefore, based on the misalignment type, the calculation method for calculating the misalignment amount of the tab cluster can be determined, and the misalignment amount of the tabs to be included in the calculation can be selected according to the calculation method, thereby calculating the misalignment amount of the tab cluster more accurately.

[0199] In this step, the misalignment of the anode tab cluster can be determined for the anode tab cluster, and the misalignment of the cathode tab cluster can be determined for the cathode tab cluster.

[0200] S1040, based on the misalignment of the cathode tab cluster and the anode tab cluster, determines the first rotation angle at which the winding needle needs to continue rotating from the preset feeding angle after the winding body is obtained, so that the winding body can be fed from the winding needle.

[0201] The preset feeding angle is a predetermined angle in the preset control strategy of the winding machine. After winding is completed, the winding needle will rotate to this angle to prepare for feeding the wound body.

[0202] The first rotation angle is calculated based on the misalignment of the cathode tab cluster and the anode tab cluster, which is the angle at which the winding needle needs to continue rotating from the preset feeding angle.

[0203] This method, for each tab cluster, determines the misalignment amount of each tab based on the rotation angle of the reference needle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the tape lengths of multiple electrodes corresponding to the tab cluster, and the rotation angle of the corresponding needle. Based on the misalignment amount of the tabs in the tab cluster, the misalignment type of the tab cluster is determined. Based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster, the misalignment amount of the tab cluster itself is determined. Based on the misalignment amounts of the cathode tab cluster and the anode tab cluster, a first rotation angle is determined from the preset feeding angle so that the winding body can be fed from the needle. In this way, after obtaining the winding body, the needle can be controlled to continue rotating at this first rotation angle before feeding to the pre-pressing position for pre-pressing. This allows for pre-pressing of the winding body at an appropriate angle, improving the tab misalignment of the pre-pressed winding body.

[0204] Figure 12 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. For example... Figure 12 As shown, step S1020 in other embodiments is specified as steps S1222-S1224 in this embodiment.

[0205] S1222, Identify a first characteristic pole ear from among the multiple pole ears included in the pole ear cluster.

[0206] The first characteristic electrode is the electrode used to identify the misalignment type of electrode clusters. It can be understood that electrode clusters with different misalignment types have different characteristics in the amount of misalignment of their electrodes. Electrodes with a characteristic amount of misalignment can be understood as the first characteristic electrode.

[0207] Taking the first misalignment type, the second misalignment type, and the third misalignment type as examples: For the first misalignment type, its corresponding first characteristic tab includes the outermost tab and the innermost tab; for the second misalignment type, its corresponding first characteristic tab includes the outermost tab, the innermost tab, and the middle tab; for the third misalignment type, its corresponding first characteristic tab includes the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster from the outer layer to the inner layer, and the tab located at 3 / 4 of the tab cluster from the outer layer to the inner layer.

[0208] In this step, for an anode tab cluster, a first characteristic tab of the anode tab cluster can be determined from among the multiple tabs it includes, and for a cathode tab cluster, a first characteristic tab of the cathode tab cluster can be determined from among the multiple tabs it includes.

[0209] S1224, Based on the misalignment amount of the first feature electrode, determine the misalignment type of the electrode cluster.

[0210] In some embodiments, the misalignment type of the tab cluster can be determined as the first misalignment type based on the misalignment amount of the outermost tab and the innermost tab.

[0211] In other embodiments, the misalignment type of the tab cluster can be determined as the second misalignment type based on the misalignment amount of the outermost tab, the innermost tab, and the middle tab.

[0212] In other embodiments, the misalignment type of the tab cluster can be determined as the third misalignment type based on the misalignment amount of the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster from the outer layer to the inner layer, and the tab located at 3 / 4 of the tab cluster from the outer layer to the inner layer.

[0213] In this step, for the anode tab cluster, the misalignment type of the anode tab cluster can be determined based on the misalignment amount of the first characteristic tab of the anode tab cluster, and for the cathode tab cluster, the misalignment type of the cathode tab cluster can be determined based on the misalignment amount of the first characteristic tab of the cathode tab cluster.

[0214] This embodiment selects a specific first characteristic pole from the multiple poles included in the pole cluster. The first characteristic pole is a pole with representative characteristics of the misalignment amount. Based on its misalignment amount, the misalignment type is determined, which can more accurately and efficiently capture the overall misalignment performance of the pole to pole cluster, making the judgment of the misalignment type more efficient and accurate.

[0215] Figure 13 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. For example... Figure 13 As shown, step S1030 in other embodiments is specified as steps S1332-S1334 in this embodiment.

[0216] S1332, Based on the misalignment type of the electrode cluster, determine the second characteristic electrode from the multiple electrodes included in the electrode cluster.

[0217] The second feature anode is used to determine the amount of misalignment in a cluster of anodes. It is understandable that, for the same cluster of anodes, the first feature anode that identifies its misalignment type and the second feature anode that determines its misalignment amount may be the same or different, depending on the method used to calculate the overall degree of misalignment of the cluster. Therefore, the second feature anode used in calculating the misalignment amount of a cluster of anodes can be selected based on the calculation method.

[0218] In this step, for the anode tab cluster, based on the misalignment type of the anode tab cluster, the second characteristic tab of the anode tab cluster can be determined from the multiple tabs included in the anode tab cluster; for the cathode tab cluster, based on the misalignment type of the cathode tab cluster, the second characteristic tab of the cathode tab cluster can be determined from the multiple tabs included in the cathode tab cluster.

[0219] In some embodiments of this application, each electrode included in the electrode cluster can be defined as a second characteristic electrode.

[0220] In other embodiments of this application, a portion of the electrodes included in the electrode cluster may be identified as the second characteristic electrodes.

[0221] S1334, Based on the misalignment of the second characteristic pole ear, determine the misalignment of the pole ear cluster.

[0222] Based on the misalignment of the second characteristic tab, the calculation method for the misalignment of the tab cluster is determined, and there are multiple calculation methods that can be used subsequently.

[0223] In one calculation method, the misalignment of each second characteristic tab can be summed to obtain the misalignment of the tab cluster.

[0224] In another calculation method, the misalignment of each second characteristic tab can be weighted and summed to obtain the misalignment of the tab cluster.

[0225] In another calculation method, the misalignment of each second characteristic tab can be averaged to obtain the misalignment of the tab cluster.

[0226] In step S1334, the misalignment amount of the anode tab cluster can be determined based on the second characteristic tab of the anode tab cluster, and the misalignment amount of the cathode tab cluster can be determined based on the second characteristic tab of the cathode tab cluster.

[0227] Since the misalignment type reflects the overall misalignment of the tab cluster, this embodiment selects second characteristic tabs in a targeted manner according to the misalignment type. The misalignment amount of these second characteristic tabs can more accurately reflect the actual misalignment of the overall misalignment of the tab cluster. Calculating the misalignment amount of the tab cluster using the misalignment amount of these second characteristic tabs can effectively improve the accuracy of the misalignment amount of the tab cluster.

[0228] Figure 14 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. In this embodiment, the first feature tab includes at least the outermost tab and the innermost tab of the tab cluster. For example... Figure 14 As shown, step S1224 in other embodiments is specified as steps S1424a-S1424b in this embodiment.

[0229] S1424a, calculate the first difference between the misalignment of the outermost tab and the misalignment of the innermost tab.

[0230] As can be seen from the exemplary description of the preceding embodiments, the first misalignment type is used to characterize the misalignment of the tabs in the tab cluster in a certain direction, indicating that there is a continuously accumulating deviation during the winding process. Based on the continuously accumulating deviation, the misalignment amount of the outermost tab and the innermost tab of the tab cluster will show a large difference. Therefore, this embodiment calculates a first difference between the misalignment amount of the outermost tab and the misalignment amount of the innermost tab, thereby quantifying the misalignment difference of the first characteristic tabs at these two key positions through the first difference, providing specific numerical basis for subsequent determination of the misalignment type of the tab cluster.

[0231] In this step, for the anode tab cluster, the first difference between the misalignment of the outermost tab and the innermost tab of the anode tab cluster can be calculated to obtain the first difference corresponding to the anode tab cluster. For the cathode tab cluster, the first difference between the misalignment of the outermost tab and the innermost tab of the cathode tab cluster can be calculated to obtain the first difference corresponding to the cathode tab cluster.

[0232] S1424b, if the first difference is greater than the first threshold, determine the misalignment type of the anode cluster as the first misalignment type.

[0233] The first threshold is a pre-set standard value used to determine the misalignment type of the tab cluster. By comparing the first difference with the first threshold, it can be determined whether the tab cluster belongs to the first misalignment type.

[0234] Furthermore, if the first difference is less than or equal to the first threshold, it can be determined that the misalignment type of the electrode cluster is not the first misalignment type.

[0235] There are multiple ways to determine the size of the first threshold.

[0236] In some embodiments, the size of the first threshold can be determined by statistical analysis of the experimental data through a winding experiment.

[0237] For example, electrode cluster samples can be manufactured under different combinations of process parameters. The misalignment of the outermost and innermost electrodes in each sample is then measured, and their difference is calculated to obtain experimental data. Statistical analysis is performed on a large amount of experimental data to plot a distribution curve of the first difference. From the distribution curve, the specific position of the first threshold on the distribution curve when the electrode cluster exhibits the first misalignment type can be determined, such as at the 90th or 95th quantile, thus determining the magnitude of the first threshold. Through the analysis of the experimental data, the first threshold used to identify the first misalignment type can be determined.

[0238] In other embodiments, the size of the first threshold can be determined by collecting the experience accumulated by technicians in long-term production practice.

[0239] In this step, the first difference corresponding to the anode tab cluster is compared with a first threshold. If the first difference of the anode tab cluster is greater than the first threshold, the misalignment type of the anode tab cluster is determined to be the first misalignment type. The first difference corresponding to the cathode tab cluster is also compared with the first threshold. If the first difference of the cathode tab cluster is greater than the first threshold, the misalignment type of the cathode tab cluster is determined to be the first misalignment type.

[0240] For example, the process of identifying the misalignment type of an anode tab cluster may include: obtaining the misalignment amount of the outermost tab of the anode tab cluster, assuming it is 6 mm, and the misalignment amount of the innermost tab, assuming it is 2 mm; calculating a first difference: first difference = 6 - 2 = 4 mm; assuming a pre-set first threshold of 3 mm, since 4 mm > 3 mm, the misalignment type of the anode tab cluster is determined to be the first misalignment type.

[0241] In this embodiment, by focusing on the difference in misalignment between the outermost and innermost tabs, the continuously accumulating deviation of the tab cluster can be captured more accurately. Compared with a general analysis of all tabs, this improves the accuracy of misalignment type judgment, and the number of tabs to be analyzed is smaller, resulting in higher analysis efficiency.

[0242] In some embodiments, when the tab cluster is determined to be of a first misalignment type, determining a second characteristic tab from among the multiple tabs included in the tab cluster may include:

[0243] Each electrode included in the electrode cluster is identified as a second characteristic electrode.

[0244] For example, assuming a first misaligned type of anode tab cluster includes 100 layers of tabs, all 100 layers of tabs can be used as second characteristic tabs.

[0245] It is understandable that the first type of misalignment is characterized by a continuous accumulation of deviation in one direction on one side of the entire tab cluster. Based on this, this embodiment determines the overall misalignment of the tab cluster based on the misalignment of each tab, which can greatly improve the calculation accuracy.

[0246] Figure 15 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. In this embodiment, the first feature tab includes at least the outermost tab, the innermost tab, and the middle tab of the tab cluster. For example... Figure 15 As shown, step S1224 in other embodiments is specified as steps S1524a-S1524b in this embodiment.

[0247] S1524a, calculate the second difference between the misalignment of the outermost electrode and the middle electrode, the third difference between the misalignment of the innermost electrode and the middle electrode, and the fourth difference between the misalignment of the outermost electrode and the innermost electrode.

[0248] As can be seen from the exemplary description of the preceding embodiments, the second misalignment type is used to characterize that the middle layer of electrodes in the electrode cluster exhibits a significant misalignment relative to the innermost and outermost electrodes. Based on this significant misalignment, the misalignment amount of the middle layer electrodes in the electrode cluster differs considerably from the misalignment amount of the innermost and outermost electrodes. Therefore, this embodiment calculates a second difference between the misalignment amount of the outermost electrode and the middle layer electrodes, a third difference between the misalignment amount of the innermost electrode and the middle layer electrodes, and a fourth difference between the misalignment amount of the outermost electrode and the innermost electrode. These second, third, and fourth differences quantify the difference in misalignment amount between the middle layer electrodes and the innermost and outermost electrodes, providing specific numerical basis for subsequently determining the misalignment type of the electrode cluster.

[0249] In this step, for the anode tab cluster, the second difference between the misalignment of the outermost tab and the middle tab, the third difference between the misalignment of the innermost tab and the middle tab, and the fourth difference between the misalignment of the outermost tab and the innermost tab can be calculated. For the cathode tab cluster, the second difference between the misalignment of the outermost tab and the middle tab, the third difference between the misalignment of the innermost tab and the middle tab, and the fourth difference between the misalignment of the outermost tab and the innermost tab can be calculated.

[0250] S1524b, when both the second and third differences are greater than the second threshold and the fourth difference is less than the third threshold, the misalignment type of the pole ear cluster is determined to be the second misalignment type.

[0251] The second and third thresholds are pre-set standard values ​​used to identify the second misalignment type of the tab cluster. By comparing the second and third differences with the second threshold, and the fourth difference with the third threshold, it can be determined whether the tab cluster belongs to the second misalignment type.

[0252] Furthermore, if the second difference is less than or equal to the second threshold, or if the third difference is less than or equal to the second threshold, or if the fourth difference is greater than or equal to the third threshold, it can be determined that the misalignment type of the pole ear cluster is not the second misalignment type.

[0253] There are multiple ways to determine the size of the second and third thresholds. For details, please refer to the method for determining the first threshold. It will not be elaborated here.

[0254] In this step, the second and third differences corresponding to the anode tab clusters are compared with the second threshold, and the fourth difference corresponding to the anode tab clusters is compared with the third threshold. If both the second and third differences of the anode tab clusters are greater than the second threshold, and the fourth difference is less than the third threshold, the misalignment type of the anode tab clusters is determined to be the second misalignment type. The process for determining the second misalignment type of the cathode tab clusters is similar and will not be described in detail here.

[0255] In this embodiment, when the second difference and the third difference are both greater than the second threshold and the fourth difference is less than the third threshold, it indicates that the outermost and innermost tabs are significantly misaligned relative to the middle tabs, and the misalignment difference between the outermost and innermost tabs is relatively small. This effectively captures the tab clusters of the second misalignment type, resulting in high analysis efficiency and reducing the possibility of misjudgment, making the judgment results more reliable.

[0256] In some embodiments, when the tab cluster is determined to be of the second misalignment type, determining the second characteristic tab from the plurality of tabs included in the tab cluster may include:

[0257] The second characteristic electrode is determined based on the outermost, innermost, and middle electrode clusters.

[0258] In some embodiments, the outermost tab, the innermost tab, and the middle tab can be selected as the second characteristic tab.

[0259] In other embodiments, the outermost electrode tab and its adjacent electrode tabs, the innermost electrode tab and its adjacent electrode tabs, and the middle electrode tab and its adjacent electrode tabs can be selected as the second characteristic electrode tabs.

[0260] For example, assuming a second misaligned type of anode tab cluster includes 100 tabs, the outermost tab, the innermost tab, and the fiftieth tab can be selected as the second characteristic tab.

[0261] It is understandable that the characteristic of the second misalignment type is that the innermost and outermost tabs are significantly misaligned relative to the middle tabs. Based on this, this embodiment determines the second characteristic tab based on the representative innermost, outermost, and middle tabs, and can determine the overall misalignment of the tab cluster based on the misalignment of the second characteristic tab, which greatly improves the calculation accuracy.

[0262] Figure 16 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. In this embodiment, the first characteristic tab includes at least the outermost tab, the innermost tab, the middle tab, a tab located at 1 / 4 of the distance from the outer layer to the inner layer of the tab cluster, and a tab located at 3 / 4 of the distance from the outer layer to the inner layer of the tab cluster. For example... Figure 16 As shown, step S1224 in other embodiments is specified as steps S1624a-S1624c in this embodiment.

[0263] S1624a, calculate the fifth difference between the misalignment of the tab at 1 / 4 and the misalignment of the middle tab, the sixth difference between the misalignment of the middle tab and the misalignment of the tab at 3 / 4, the seventh difference between the misalignment of the innermost tab and the misalignment of the middle tab, and the eighth difference between the misalignment of the middle tab and the misalignment of the outermost tab.

[0264] As can be seen from the exemplary description of the preceding embodiments, the third misalignment type is used to characterize that in the tab cluster, before and after the middle layer, there are tabs at different positions (such as the outermost layer, the innermost layer, the 1 / 4 position from the outside to the inside, and the 3 / 4 position) that have significant misalignment differences relative to the middle layer tabs. Therefore, based on this characteristic, this embodiment calculates the fifth difference between the misalignment amount of the tab at the 1 / 4 position and the misalignment amount of the middle layer tabs, the sixth difference between the misalignment amount of the middle layer tabs and the misalignment amount of the tabs at the 3 / 4 position, the seventh difference between the misalignment amount of the innermost tabs and the middle layer tabs, and the eighth difference between the misalignment amount of the middle layer tabs and the outermost tabs, quantifying the differences in the misalignment amount of these characteristic tabs, and providing specific numerical basis for subsequent determination of the misalignment type of the tab cluster.

[0265] In this step, for the anode tab cluster, the following values ​​can be calculated: the fifth difference between the misalignment of the tab at 1 / 4 of the anode tab cluster and the misalignment of the intermediate layer tabs; the sixth difference between the misalignment of the intermediate layer tabs and the misalignment of the tab at 3 / 4 of the anode tab cluster; the seventh difference between the misalignment of the innermost tab and the misalignment of the intermediate layer tabs; and the eighth difference between the misalignment of the intermediate layer tabs and the misalignment of the outermost tabs. Similarly, for the cathode tab, the following values ​​can be calculated: the fifth difference between the misalignment of the tab at 1 / 4 of the cathode tab cluster and the misalignment of the intermediate layer tabs; the sixth difference between the misalignment of the intermediate layer tab and the misalignment of the tab at 3 / 4 of the anode tab cluster; the seventh difference between the misalignment of the innermost tab and the intermediate layer tabs; and the eighth difference between the misalignment of the intermediate layer tab and the outermost tab.

[0266] S1624b, calculate the ninth difference between the misalignment of the tab at 1 / 4 and the misalignment of the innermost tab, and the tenth difference between the misalignment of the tab at 3 / 4 and the misalignment of the outermost tab.

[0267] As can be seen from the exemplary description of the previous embodiments, the third misalignment type also has the characteristics of small difference in misalignment between the outermost tab and the tab at 3 / 4, and small difference in misalignment between the innermost tab and the tab at 1 / 4. Therefore, this embodiment will calculate the ninth difference between the misalignment amount of the tab at 1 / 4 and the misalignment amount of the innermost tab, and the tenth difference between the misalignment amount of the tab at 3 / 4 and the misalignment amount of the outermost tab, to provide specific numerical basis for subsequent determination of the misalignment type of the tab cluster.

[0268] S1624c, when the fifth, sixth, seventh, and eighth differences are all greater than the fourth threshold, and the ninth and tenth differences are both less than the fifth threshold, the misalignment type of the pole ear cluster is determined to be the third misalignment type.

[0269] The fourth and fifth thresholds are pre-set standard values ​​used to identify the third misalignment type of the tab cluster. By comparing the fifth, sixth, seventh, and eighth differences with the fourth threshold, and the ninth and tenth differences with the fifth threshold, it can be determined whether the tab cluster belongs to the third misalignment type.

[0270] There are multiple ways to determine the size of the fourth and fifth thresholds. For details, please refer to the method for determining the first threshold. It will not be elaborated here.

[0271] In addition, if the fifth, sixth, seventh, or eighth difference is less than or equal to the fourth threshold, or if the ninth or tenth difference is greater than or equal to the fifth threshold, it can be determined that the misalignment type of the anode cluster is not the third misalignment type.

[0272] In this step, the fifth, sixth, seventh, and eighth differences corresponding to the anode tab cluster are compared with the fourth threshold, and the ninth and tenth differences are compared with the fifth threshold to determine whether the misalignment type of the anode tab cluster is the second misalignment type. The process for determining the third misalignment type of the cathode tab cluster is similar and will not be described in detail here.

[0273] In this embodiment, when the fifth, sixth, seventh, and eighth differences are all greater than the fourth threshold, and the ninth and tenth differences are both less than the fifth threshold, it indicates that the electrode cluster exhibits the characteristics of an S-shaped misalignment type. This effectively captures electrode clusters of the third misalignment type, resulting in high analysis efficiency, reduced possibility of misjudgment, and more reliable judgment results.

[0274] In some embodiments, when the tab cluster is determined to be of the third misalignment type, determining the second characteristic tab from the plurality of tabs included in the tab cluster may include:

[0275] The second characteristic electrode is determined based on the outermost electrode, the innermost electrode, the middle electrode, the electrode located at 1 / 4 of the electrode cluster, and the electrode located at 3 / 4 of the electrode cluster.

[0276] In some embodiments, the outermost tab, the innermost tab, the middle tab, the tab located at 1 / 4 of the tab cluster, and the tab located at 3 / 4 of the tab cluster can be selected as the second characteristic tab.

[0277] In other embodiments, the outermost electrode and its adjacent electrodes, the innermost electrode and its adjacent electrodes, the middle electrode and its adjacent electrodes, the electrode located at 1 / 4 of the electrode cluster and its adjacent electrodes, and the electrode located at 3 / 4 of the electrode cluster and its adjacent electrodes can be selected as the second characteristic electrodes.

[0278] For example, assuming a third misaligned type of anode tab cluster includes 100 tabs, the outermost tab, the innermost tab, the 25th tab, the 50th tab, and the 75th tab can be selected as the second characteristic tab.

[0279] It is understandable that the characteristic of the third misalignment type is that there are poles at different positions before and after the middle layer of the pole cluster, which have significant misalignment differences relative to the middle layer poles. Based on this, this embodiment determines the second characteristic pole based on the representative innermost, outermost, middle layer, poles located at 1 / 4 of the pole cluster, and poles located at 3 / 4 of the pole cluster. The overall misalignment of the pole cluster can be determined based on the misalignment of the second characteristic pole, which greatly improves the calculation accuracy.

[0280] In addition to the above Figure 14 , Figure 15 and Figure 16Besides the implementation method shown, misalignment types can also be identified in other ways. For example, by comprehensively analyzing the differences in misalignment of all the tabs in the tab cluster, the entire picture of the misalignment differences of the entire tab cluster can be captured, and any misalignment type such as the first misalignment type, the second misalignment type, and the third misalignment type can be identified.

[0281] In some embodiments, the misalignment of the electrode cluster can be determined based on the misalignment of the second feature electrode, the hierarchy of the second feature electrode in the electrode cluster, and the total number of electrodes included in the electrode cluster.

[0282] For example, taking the misalignment type of the tab cluster as the first misalignment type, the process of determining the misalignment amount of the tab cluster may include:

[0283] If the absolute value of the misalignment of the outermost tab is greater than the preset misalignment threshold (such as 2mm, 3mm, etc.), the average value of the misalignment of the outermost 3 tabs of the cathode tab cluster can be taken as the misalignment of the cathode tab cluster, and the average value of the misalignment of the outermost 3 tabs of the anode tab cluster can be taken as the misalignment of the anode tab cluster.

[0284] Since the outermost tab of the single-sided misaligned type of tab cluster is greatly affected by external factors during the winding process, its misalignment can reflect the overall single-sided offset trend to a certain extent. Therefore, this embodiment uses the misalignment of the outermost multi-layer tabs to calculate the overall single-sided misalignment, thereby obtaining a relatively accurate single-sided misalignment.

[0285] If the absolute value of the misalignment of the outermost tab is less than or equal to the preset misalignment threshold, determine whether the absolute value of the misalignment of all layers of the tab cluster is less than or equal to 2mm.

[0286] If so, it indicates that the overall misalignment is small and the misalignment of the tab cluster is minor, so no action is needed. In other words, normal feeding is allowed, and there is no need to continue rotating the winding needle.

[0287] If not, for example, if the absolute value of the misalignment of at least one tab is greater than 2 mm, the misalignment of that at least one tab can be multiplied by the layer level corresponding to that tab and then divided by the total layer level of all tabs in the tab cluster to obtain the misalignment component corresponding to that at least one tab. If the number of at least one tab is one layer, the misalignment component of that one tab can be used as the misalignment of the tab cluster; if the number of at least one tab is multiple layers, the misalignment components of the multiple tabs can be summed to obtain the misalignment of the tab cluster.

[0288] By multiplying the misalignment of a tab with a large misalignment by the corresponding layer level, the influence weight of that layer can be amplified. Then, by dividing by the total number of layers for normalization, a misalignment component that comprehensively considers the overall structure and degree of misalignment of the tab cluster can be obtained, resulting in a more reasonable and accurate calculation result.

[0289] It should be noted that other types of misaligned tab clusters can use the same or different misalignment calculation methods as the first misalignment type mentioned above.

[0290] In the above embodiments, by determining the misalignment of the second characteristic tab, the hierarchy of the second characteristic tab in the tab cluster, and the total number of tabs included in the tab cluster, a misalignment amount that comprehensively considers the overall structure and degree of misalignment of the tab cluster can be obtained, and the calculation result is more reasonable and accurate.

[0291] Figure 17 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. For example... Figure 17 As shown, step S1010 in other embodiments is specifically implemented in this embodiment as performing the following steps S1710a-S1710b for each electrode included in the electrode cluster.

[0292] S1710a, the tape length of the electrode is determined based on the rotation angle of the reference needle corresponding to the reference electrode tab of the reference winding body, the tape length of multiple electrode sheets corresponding to the electrode tab cluster, and the rotation angle of the corresponding needle.

[0293] In some embodiments, the length of the electrode corresponding to the tab cluster corresponds to the rotation angle of the winding needle during the winding process. Therefore, the rotation angle of the reference winding needle and the corresponding reference tape length corresponding to the reference tab of the reference winding body can be recorded, as well as the rotation angle of the winding needle and the corresponding tape lengths of multiple electrodes of the winding body to be improved can be recorded. Through the records of the reference winding body, the correspondence between the rotation angle of the winding needle and the tab can be determined. Based on this correspondence, the tab corresponding to the rotation angle of the winding needle of the winding body to be improved can be determined, and the tape lengths of multiple electrodes corresponding to that tab can be further determined. For example, when the tab cluster of the winding body to be improved is wound, when the winding needle rotates to 180°, the corresponding electrode tape length is 505mm, and in the records of the reference winding body, 180° corresponds to the Nth reference tab, where N is a positive integer greater than 1. Thus, the tape length corresponding to the Nth tab of the winding body to be improved is 505mm.

[0294] In other embodiments, considering that various external factors may lead to insufficient accuracy of the recorded data, the tape length of the electrode can be corrected by combining the standard data of the reference winding.

[0295] S1710b, the misalignment of the electrode tab is determined based on the travel length of the electrode tab and the reference travel length of the reference electrode tab.

[0296] By comparing the travel length of each electrode tab with the reference travel length of the corresponding reference electrode tab, the misalignment of each electrode tab can be calculated.

[0297] The reference winding body represents the ideal winding state, and the reference needle rotation angle and reference tape length corresponding to its reference tab are preset standard values. Based on the reference needle rotation angle corresponding to the reference tab of the reference winding body, the reference tape length corresponding to that reference tab can be directly determined. For example, if the needle rotation angle corresponding to reference tab A of the reference winding body is 180°, the corresponding reference tape length is 500mm; this is the standard tape length for reference tab A.

[0298] For example, the misalignment of the electrode can be obtained by subtracting the travel length of the reference electrode from the travel length of the reference electrode. The absolute value of this difference can be used as the misalignment. For instance, if the actual travel length of an electrode is 505mm and the reference travel length of the corresponding reference electrode is 500mm, then the misalignment of this electrode is 505 - 500 = 5mm, indicating that the misalignment of this electrode relative to the reference electrode is 5mm.

[0299] For example, the reference tape length and the corresponding reference winding needle rotation angle of the detected cathode and anode tab clusters at the rising (or falling) edge can be stored in real time. Then, when a cell with fully aligned tabs is observed at the pre-load position, the correspondence between the reference winding needle rotation angle and the reference tape length is recorded.

[0300] After obtaining the actual winding body to be improved, the tape length of the tabs of the tab cluster of the winding body to be improved can be compared with the reference tape length of the reference tab to obtain the misalignment of the tabs of the winding body to be improved.

[0301] In this embodiment, by comparing the actual travel length of each electrode with the reference travel length of the reference electrode, the misalignment of each electrode can be accurately quantified.

[0302] Figure 18 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. For example... Figure 18 As shown, step S1710a in other embodiments can be embodied as steps S1810c-S1810f.

[0303] S1810c, from a plurality of needle rotation angles, determine the first needle rotation angle and the second needle rotation angle that are adjacent to the reference needle rotation angle.

[0304] S1810d determines the compensation coefficient based on the reference needle rotation angle, the first needle rotation angle, and the second needle rotation angle.

[0305] S1810e, based on the first electrode travel length corresponding to the first winding needle rotation angle, the second electrode travel length corresponding to the second winding needle rotation angle, and the compensation coefficient, the first compensation amount of the electrode travel length is determined.

[0306] S1810f, based on the first compensation amount, compensates for the travel length of the second electrode to obtain the travel length of the electrode tab.

[0307] In this embodiment, the corresponding first compensation amount is calculated through the above steps S1810c-S1810f, and the directly acquired tape length is calibrated.

[0308] For example, assuming the compensation coefficient is k and the travel length P of the electrode tab is... 极耳 It can be calculated using the following formulas (1) and (2):

[0309] P 极耳 = P2+(P1- P2)*k (1)

[0310] k=(R 参考 - R2) / (R1-R2) (2)

[0311] Where P2 represents the travel length of the second electrode, P1 represents the travel length of the first electrode, and R... 参考 R1 represents the angle that the reference winding needle has rotated, R2 represents the angle that the second winding needle has rotated, R1 represents the angle that the first winding needle has rotated, and k can be a natural number between 0 and 1.

[0312] This embodiment takes into account the problem that the detected tape length may not be the accurate tape length of the tab due to factors such as the detection cycle refresh frequency in practical applications. The tape length of the tab has been corrected to make the calculation of the tab misalignment more accurate.

[0313] Figure 19 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. For example... Figure 19 As shown, step S1810f in other embodiments can be embodied as steps S1910g-S1910h.

[0314] S1910g, based on the travel length of the innermost tab of the tab cluster and the reference travel length of the innermost reference tab of the reference tab cluster, determines the second compensation amount.

[0315] S1910h, based on the first compensation amount and the second compensation amount, compensates for the travel length of the second electrode to obtain the travel length of the electrode tab.

[0316] In this embodiment, by using the above steps S1910g-S1910h, the impact of feed position fluctuations on the accuracy of the electrode belt length can be further avoided.

[0317] Due to the influence of feed position fluctuations, the collected electrode travel length may be inaccurate. Therefore, the calibration parameter corresponding to the feed position fluctuation, namely the second compensation amount, can be determined based on the travel length of the innermost electrode of the actual winding body to be improved and the reference travel length of the innermost electrode of the reference winding body. Thus, the electrode travel length can be corrected based on the second compensation amount.

[0318] Specifically, after compensating the second electrode's travel length based on the first compensation amount, the second compensation amount can be subtracted to obtain the final travel length of the electrode tab, which is P calculated in formulas (1) and (2). 极耳 Based on this, a second compensation amount is subtracted. This second compensation amount is equal to the difference between the travel length of the innermost tab of the tab cluster and the reference travel length of the innermost reference tab of the reference tab cluster.

[0319] Figure 20 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. For example... Figure 20 As shown, step S1040 in other embodiments can be embodied as steps S2040a-S2040b.

[0320] S2040a, the tab misalignment of the winding body is determined based on the average of the misalignment of the cathode tab cluster and the anode tab cluster.

[0321] S2040b, based on the offset of the tabs of the wound body, determines the first rotation angle at which the winding needle needs to continue rotating from the preset feeding angle after the wound body is obtained.

[0322] In this embodiment, through the above steps S2040a-S2040b, based on the average of the misalignment of the cathode tab cluster and the anode tab cluster, the first rotation angle at which the winding body needs to continue rotating is determined. This can take into account the misalignment of the cathode tab cluster and the anode tab cluster, and more reasonably determine the first rotation angle, so as to more effectively improve the tab misalignment of the winding body.

[0323] In some embodiments, step S2040b may specifically include:

[0324] Based on the offset of the tabs of the winding body and the radius of the winding body, the first rotation angle at which the winding needle needs to continue rotating from the preset feeding angle after the winding body is obtained is determined.

[0325] In this embodiment, the arc length can be determined by using the offset of the tabs of the winding body as the arc length and the radius of the winding body as the radius. The angle that the winding needle needs to rotate, i.e. the first rotation angle, can then be accurately calculated according to the arc length formula.

[0326] Wherein: the arc length formula is: L=r×θ. Where θ is the central angle subtended by the arc, in radians, L is the arc length, which is also the offset of the tabs of the winding body, r is the radius of the winding body, and α is the first rotation angle.

[0327] In other embodiments of this application, after step S1040, the method may further include the following steps:

[0328] After the wound body is unloaded from the winding needle, the winding needle is controlled to rotate to the preset unloading angle.

[0329] In this embodiment, since the winding needle continues to rotate from the preset feeding angle to the first rotation angle, after feeding, the winding needle is controlled to rotate to the preset feeding angle, thereby restoring the winding needle to a fixed position and avoiding the problem of not being able to determine the position of the recess in subsequent working processes.

[0330] In some embodiments of this application, the anode tab and the cathode tab may be located on the same side or opposite sides of the winding body.

[0331] In this embodiment, regardless of whether the anode tab and the cathode tab are located on the same side or opposite side of the winding body, the tab misalignment of the pre-compressed winding body can be improved.

[0332] Figure 21 This is a schematic flowchart illustrating a winding method provided in some embodiments of this application. For example... Figure 21 As shown, the method may include steps S2110-S2180.

[0333] S2110, collect the rotation angle of the winding needle used to form the winding body and the multiple electrode strip lengths of the electrode strips corresponding to the electrode clusters in the winding body.

[0334] For example, the anode roller and cathode roller can be set upstream of the winding needle. The anode acquisition device collects the lengths of multiple anode plates through the anode roller, and the cathode acquisition device collects the lengths of multiple cathode plates through the cathode roller.

[0335] For example, an angle acquisition device can be used to acquire the angles of the winding needle rotation corresponding to the lengths of the multiple electrode strips of the anode electrode and the angles of the winding needle rotation corresponding to the lengths of the multiple electrode strips of the cathode electrode.

[0336] S2120, during the winding process of the winding body, the rotation angle of the winding needle and the length of the electrode tape are collected in real time and cached.

[0337] S2130, determine whether the winding needle needs to continue rotating after the winding body is obtained.

[0338] In this step, a model can be used to determine whether angle adjustment is necessary. The model can be a mathematical model or an algorithmic model, used to determine whether the winding needle needs to continue rotating after obtaining the wound body, based on the collected rotation angle of the winding needle and the length of the electrode tape. For example, the misalignment of the tab cluster can be determined based on the collected rotation angle of the winding needle and the length of the electrode tape, and it can be determined whether the misalignment reaches a threshold for continued rotation. If the misalignment of the tab cluster reaches the threshold for continued rotation, it can be determined that the winding needle needs to continue rotating after obtaining the wound body; otherwise, it can be determined that the winding needle does not need to continue rotating after obtaining the wound body.

[0339] If so, proceed to step S2140.

[0340] If not, proceed to step S2150.

[0341] S2140, based on the already rotated angle of the buffered winding needle and the length of the electrode tape, determines the first rotation angle at which the winding needle needs to continue rotating from the preset feeding angle after obtaining the wound body, and controls the winding needle to continue rotating from the preset feeding angle to the first rotation angle.

[0342] Step S2140 can be implemented by referring to steps S1010-S1040 in other embodiments, and will not be described in detail here.

[0343] S2150, determine that after the winding body is obtained, the winding needle will feed from the preset feeding angle.

[0344] S2160 controls the feeding clamp needle to feed the wound body from the winding needle.

[0345] For example, the feeding clamp needle serves as the end effector of the battery cell feeding robot, working in conjunction with other parts of the battery cell feeding robot to complete the process of picking up and placing materials.

[0346] S2170: After feeding, control the spinning needle to rotate to the preset feeding angle.

[0347] In the steps, controlling the rotation of the spinning needle to the preset feeding angle can be understood as the return of the spinning needle to the preset feeding angle.

[0348] S2180, pre-presses the unwound coil into shape.

[0349] 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 winding method, characterized in that, A method for forming a wound body by winding anode sheet, a first diaphragm, cathode sheet, and a second diaphragm with a hook, the wound body comprising multiple tab clusters, the multiple tab clusters including anode tab clusters and cathode tab clusters, the anode sheet comprising multiple anode tabs, the multiple anode tabs forming anode tab clusters after being stacked in multiple layers of the wound body, the cathode sheet comprising multiple cathode tabs, the multiple cathode tabs forming cathode tab clusters after being stacked in multiple layers of the wound body, the method comprising: For each tab cluster, the misalignment amount of each tab is determined based on the reference needle rotation angle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the tape lengths of multiple pole pieces of the tab cluster, and the corresponding needle rotation angles. The misalignment type of the tab cluster is determined based on the misalignment amount of the tabs in the tab cluster. The misalignment amount of the tab cluster is determined based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster. Based on the misalignment of the cathode tab cluster and the anode tab cluster, a first rotation angle is determined so that the winding needle needs to continue rotating from the preset feeding angle after the winding body is obtained, so that the winding body can be fed from the winding needle.

2. The method according to claim 1, characterized in that, Determining the misalignment type of the electrode cluster based on the misalignment amount of the electrodes in the electrode cluster includes: A first characteristic electrode is determined from the plurality of electrodes included in the electrode cluster; Based on the misalignment amount of the first characteristic tab, the misalignment type of the tab cluster is determined.

3. The method according to claim 2, characterized in that, The step of determining the misalignment amount of the electrode cluster based on the misalignment amount of the electrodes in the electrode cluster and the misalignment type of the electrode cluster includes: Based on the misalignment type of the electrode cluster, a second characteristic electrode is determined from the plurality of electrodes included in the electrode cluster; The misalignment of the tab cluster is determined based on the misalignment of the second characteristic tab.

4. The method according to claim 3, characterized in that, The first characteristic tab includes at least the outermost tab and the innermost tab of the tab cluster. Determining the misalignment type of the tab cluster based on the misalignment amount of the first characteristic tab includes: Calculate the first difference between the misalignment of the outermost electrode and the misalignment of the innermost electrode; If the first difference is greater than the first threshold, the misalignment type of the electrode cluster is determined to be the first misalignment type.

5. The method according to claim 4, characterized in that, Determining the second characteristic pole ear from the plurality of pole ears included in the pole ear cluster includes: Each electrode included in the electrode cluster is identified as the second characteristic electrode.

6. The method according to any one of claims 3-5, characterized in that, The first characteristic tab includes at least the outermost tab, the innermost tab, and the middle tab of the tab cluster. Determining the misalignment type of the tab cluster based on the misalignment amount of the first characteristic tab includes: Calculate the second difference between the misalignment of the outermost electrode and the misalignment of the middle electrode, the third difference between the misalignment of the innermost electrode and the misalignment of the middle electrode, and the fourth difference between the misalignment of the outermost electrode and the misalignment of the innermost electrode. If both the second difference and the third difference are greater than the second threshold and the fourth difference is less than the third threshold, the misalignment type of the pole ear cluster is determined to be the second misalignment type.

7. The method according to claim 6, characterized in that, Determining the second characteristic pole ear from the plurality of pole ears included in the pole ear cluster includes: The second characteristic electrode is determined based on the outermost electrode, the innermost electrode, and the middle electrode of the electrode cluster.

8. The method according to any one of claims 3-7, characterized in that, The first characteristic tab includes at least the outermost tab, the innermost tab, the middle tab, a tab located at 1 / 4 of the distance from the outer layer to the inner layer of the tab cluster, and a tab located at 3 / 4 of the distance from the outer layer to the inner layer of the tab cluster. Determining the misalignment type of the tab cluster based on the misalignment amount of the first characteristic tab includes: Calculate the fifth difference between the misalignment of the tab at 1 / 4 and the misalignment of the intermediate tab, the sixth difference between the misalignment of the intermediate tab and the misalignment of the tab at 3 / 4, the seventh difference between the misalignment of the innermost tab and the misalignment of the intermediate tab, and the eighth difference between the misalignment of the intermediate tab and the misalignment of the outermost tab. Calculate the ninth difference between the misalignment of the tab at 1 / 4 and the misalignment of the innermost tab, and the tenth difference between the misalignment of the tab at 3 / 4 and the misalignment of the outermost tab. If the fifth, sixth, seventh, and eighth differences are all greater than the fourth threshold, and the ninth and tenth differences are both less than the fifth threshold, then the misalignment type of the pole ear cluster is determined to be the third misalignment type.

9. The method according to claim 8, characterized in that, Determining the second characteristic pole ear from the plurality of pole ears included in the pole ear cluster includes: The second characteristic electrode is determined based on the outermost electrode, the innermost electrode, the middle electrode, the electrode located at 1 / 4 of the electrode cluster, and the electrode located at 3 / 4 of the electrode cluster.

10. The method according to any one of claims 3-9, characterized in that, Determining the misalignment amount of the electrode cluster based on the misalignment amount of the second characteristic electrode includes: The misalignment of the electrode cluster is determined based on the misalignment of the second characteristic electrode, the hierarchy of the second characteristic electrode in the electrode cluster, and the total number of electrodes included in the electrode cluster.

11. The method according to any one of claims 1-10, characterized in that, The misalignment of each electrode tab is determined by the rotation angle of the reference winding needle corresponding to the reference electrode tab, the reference tape length of the reference electrode tab, the multiple tape lengths of the electrode sheets corresponding to the electrode tab cluster, and the rotation angle of the corresponding winding needle, including: For each electrode included in the electrode cluster, the following steps are performed: The length of the tape of the electrode is determined based on the rotation angle of the reference needle corresponding to the reference tab of the reference winding body, the tape length of multiple electrode sheets of the electrode sheet corresponding to the tab cluster, and the rotation angle of the corresponding needle. The misalignment of the electrode tab is determined based on the travel length of the electrode tab and the reference travel length of the reference electrode tab.

12. The method according to claim 11, characterized in that, Based on the rotation angle of the reference winding needle corresponding to the reference tab of the reference winding body, the multiple electrode strip lengths of the electrode sheets corresponding to the tab cluster, and the corresponding rotation angle of the winding needle, the strip length of the tab is determined, including: From the plurality of said needle rotation angles, determine the first needle rotation angle and the second needle rotation angle that are adjacent to the reference needle rotation angle; The compensation coefficient is determined based on the reference needle rotation angle, the first needle rotation angle, and the second needle rotation angle. Based on the first electrode travel length corresponding to the first rotation angle of the first winding needle, the second electrode travel length corresponding to the second rotation angle of the second winding needle, and the compensation coefficient, a first compensation amount for the electrode travel length is determined; The length of the second electrode travel is compensated based on the first compensation amount to obtain the length of the electrode tab.

13. The method according to claim 12, characterized in that, The step of compensating the tape length of the second electrode based on the first compensation amount to obtain the tape length relative to the electrode tab includes: The second compensation amount is determined based on the travel length of the innermost electrode of the electrode cluster and the reference travel length of the innermost reference electrode of the reference electrode cluster. Based on the first compensation amount and the second compensation amount, the travel length of the second electrode is compensated to obtain the travel length of the electrode tab.

14. The method according to any one of claims 1-13, characterized in that, The step of determining, based on the misalignment of the cathode tab cluster and the anode tab cluster, a first rotation angle at which the winding needle needs to continue rotating from the preset feeding angle after obtaining the wound body includes: The misalignment of the tabs of the winding body is determined based on the average of the misalignment of the cathode tab cluster and the anode tab cluster. Based on the offset of the tabs of the winding body, a first rotation angle is determined so that the winding needle can continue to rotate from the preset feeding angle after the winding body is obtained.

15. The method according to claim 14, characterized in that, The determination of the first rotation angle by which the winding needle needs to continue rotating from the preset feeding angle after obtaining the winding body, based on the electrode misalignment amount of the winding body, includes: Based on the tab misalignment of the winding body and the radius of the winding body, a first rotation angle is determined so that the winding needle can continue to rotate from the preset feeding angle after the winding body is obtained.

16. The method according to any one of claims 1-15, characterized in that, The method further includes: After the wound body is unloaded from the winding needle, the winding needle is controlled to rotate to the preset unloading angle.

17. The method according to any one of claims 1-16, characterized in that, The anode tab and the cathode tab are located on the same side or opposite side of the winding body.

18. A winding machine, characterized in that, include: roll A needle is used to wind an anode electrode, a first diaphragm, a cathode electrode, and a second diaphragm to form a wound body. The wound body includes multiple tab clusters, which include anode tab clusters and cathode tab clusters. The anode electrode includes multiple anode tabs, which form anode tab clusters after being stacked in multiple layers of the wound body. The cathode electrode includes multiple cathode tabs, which form cathode tab clusters after being stacked in multiple layers of the wound body. The data acquisition device, electrically connected to the processor, is used to acquire the multiple electrode travel lengths of the anode electrode, the multiple electrode travel lengths of the cathode electrode, the rotation angle of the winding needle corresponding to the multiple electrode travel lengths of the anode electrode, and the rotation angle of the winding needle corresponding to the multiple electrode travel lengths of the cathode electrode, and send the data to the processor. The processor is configured to, for each tab cluster, determine the misalignment amount of each tab based on the reference needle rotation angle corresponding to the reference tab of the reference winding body, the reference tape length of the reference tab, the tape lengths of multiple electrodes corresponding to the tab cluster, and the corresponding needle rotation angle; determine the misalignment type of the tab cluster based on the misalignment amount of the tabs in the tab cluster; determine the misalignment amount of the tab cluster based on the misalignment amount of the tabs in the tab cluster and the misalignment type of the tab cluster; and determine a first rotation angle by which the needle needs to continue rotating from a preset unloading angle after the winding body is obtained, so that the winding body can be unloaded from the needle, based on the misalignment amount of the cathode tab cluster and the misalignment amount of the anode tab cluster.

19. The winding machine according to claim 18, characterized in that, The data acquisition device includes: The anode roller is located upstream of the winding needle and is used to guide the anode sheet on the conveyor belt. An anode acquisition device is electrically connected to the anode roller and the processor. The anode acquisition device is used to acquire the multiple electrode belt lengths of the anode electrode through the anode roller and send them to the processor. The cathode roller is located upstream of the winding needle and is used to guide the cathode electrode sheet on the conveyor belt. A cathode acquisition device is electrically connected to the cathode roller and the processor. The cathode acquisition device is used to acquire the multiple electrode belt lengths of the cathode electrode through the cathode roller and send them to the processor. An angle acquisition device is electrically connected to the winding needle and the processor. The angle acquisition device is used to acquire the angles of the winding needle rotation corresponding to the multiple electrode travel lengths of the anode electrode and the multiple electrode travel lengths of the cathode electrode, and send them to the processor.

20. The winding machine according to claim 18 or 19, characterized in that, The outer peripheral surface of the coiling needle is provided with a recess; The winding machine also includes a feeding clamp needle, which is used to extend into the recess. In the circumferential direction of the winding needle, there is a rotation gap between the feeding clamp needle, which is housed in the recess, and the winding needle. With the central axis of the coiling needle as a reference, the central angle corresponding to the rotation gap is greater than or equal to the first rotation angle.

21. The winding machine according to any one of claims 19-20, characterized in that, The winding machine also includes: An anode through-beam sensor is disposed between the anode roller and the winding needle, and is electrically connected to the anode acquisition device and the angle acquisition device. The anode through-beam sensor is used to send a trigger signal to the anode acquisition device and the angle acquisition device when the edge of the anode tab is detected, so as to trigger the anode acquisition device to acquire the length of the anode tape, and trigger the angle acquisition device to acquire the angle of rotation of the winding needle. A cathode-beam sensor is disposed between the cathode roller and the winding needle, and is electrically connected to the cathode acquisition device and the angle acquisition device. The cathode-beam sensor is used to send a trigger signal to the cathode acquisition device and the angle acquisition device when it detects the edge of the cathode tab, so as to trigger the cathode acquisition device to acquire the length of the cathode tape, and trigger the angle acquisition device to acquire the angle of rotation of the winding needle.

22. The winding machine according to any one of claims 20-21, characterized in that, The processor is used for: For each electrode included in the electrode cluster, the following steps are performed: The length of the tape of the electrode is determined based on the rotation angle of the reference needle corresponding to the reference tab of the reference winding body, the tape length of multiple electrode sheets of the electrode sheet corresponding to the tab cluster, and the rotation angle of the corresponding needle. The misalignment of the electrode tab is determined based on the travel length of the electrode tab and the reference travel length of the reference electrode tab.

23. The winding machine according to claim 22, characterized in that, The processor is used for: From the plurality of said needle rotation angles, determine the first needle rotation angle and the second needle rotation angle that are adjacent to the reference needle rotation angle; The compensation coefficient is determined based on the reference needle rotation angle, the first needle rotation angle, and the second needle rotation angle. Based on the first electrode travel length corresponding to the first rotation angle of the first winding needle, the second electrode travel length corresponding to the second rotation angle of the second winding needle, and the compensation coefficient, a first compensation amount for the electrode travel length is determined; The length of the second electrode travel is compensated based on the first compensation amount to obtain the length of the electrode tab.

24. The winding machine according to claim 23, characterized in that, The processor is used for: The second compensation amount is determined based on the travel length of the innermost electrode of the electrode cluster and the reference travel length of the innermost reference electrode of the reference electrode cluster. Based on the first compensation amount and the second compensation amount, the travel length of the second electrode is compensated to obtain the travel length of the electrode tab.

25. The winding machine according to any one of claims 19-24, characterized in that, The processor is a host computer, and the winding machine further includes: The lower-level machine is electrically connected to the upper-level machine and is used to receive the first rotation angle sent by the upper-level machine, and control the winding needle to continue rotating from the preset feeding angle based on the first rotation angle.

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