Control method for winding process of energy storage battery cell and winding machine

Abstract

The embodiment of the present application relates to the field of energy storage cells, and provides a control method and a winding machine for winding processing of energy storage cells. The control method includes: obtaining the initial layer spacing, initial layer depth and initial layer length of the pole piece and the diaphragm in the initial winding core; constructing a mapping model y(d, h, L)=f(T, P) according to the initial temperature of the winding needle in the hot rolling process and the initial pressure P, d, h and L in the cold pressing process; and based on the actual value y1(d1, h1, L1) and the target value y'(d' , h', L'), obtain the deviation value y2=y1‑y'=(d2, h2, L2); set the adjustment threshold (ds, hs, Ls); if d'≤d2≤ds, h'≤h2≤hs and L'≤L2≤Ls, do not make any adjustments and continue monitoring; if d2>ds, T remains unchanged and P is increased; if h2>hs, T and P are increased in sequence; if L2>Ls, P remains unchanged and T is increased; until d is within the first preset range, h is within the second preset range, and L is within the third preset range.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage cells, and in particular to a control method and a winding machine for a winding process of an energy storage cell. Background Art

[0002] With the development of electronic technology and the vigorous promotion of the new energy industry, the production and manufacturing of lithium batteries has gradually become the focus of the manufacturing industry and the forefront of technological development. Lithium batteries usually have two appearances: cylindrical and square. The internal structure of lithium batteries generally adopts a spiral winding structure, and a very fine and highly permeable thin film isolation material is used to separate the positive and negative electrodes. The positive electrode includes a current collector composed of lithium cobalt oxide (or lithium nickel cobalt manganese oxide, lithium manganese oxide, lithium iron phosphate, etc.) and aluminum foil, and the negative electrode is composed of a current collector composed of graphitized carbon material and copper foil. The battery is filled with an organic electrolyte solution.

[0003] In the process of winding the above-mentioned thin film, positive electrode and negative electrode film layers, bumps occur and the interface effect between the thin film and the electrode sheet (the film layer where the positive electrode / negative electrode is located) is lost. One of the reasons for the loss of the interface effect is that the upper and lower large-surface contact heating is adopted in the hot pressing process, and the heat is transferred from the outside to the inside, so that the temperature inside is lower than that outside, and after the hot pressing is completed, stratification and wrinkles appear in the middle part of the core.

[0004] However, the existing energy storage battery cell winding production lines lack process detection, and it is difficult to manually check whether there are wrinkles during the high-speed winding process. The winding process yield and production efficiency are difficult to improve, which greatly restricts the development of battery companies. Summary of the invention

[0005] The embodiments of the present application provide a control method for winding an energy storage cell and a winding machine, which are at least beneficial to improving the yield rate of the energy storage cell.

[0006] According to some embodiments of the present application, on the one hand, the embodiments of the present application provide a control method for the winding process of an energy storage battery cell, wherein the winding process includes a loading process, an unwinding process, a hot rolling process, a cold pressing process, an interface detection process and a discharging process; the control method includes: obtaining a bottom image of the initial winding core after the cold pressing process, and obtaining the initial layer spacing, initial layer depth and initial layer length of the pole piece and the diaphragm in the initial winding core based on the bottom image; according to the initial temperature of the winding needle in the hot rolling process, the initial pressure of the cold pressing process, the initial layer spacing, initial layer depth and initial layer length of the pole piece and the diaphragm in the winding core, constructing a mapping model of y(d, h, L)=f(T, P); wherein d is the layer spacing of the winding core, h is the layer depth of the winding core. depth, L is the layer length of the core, T is the temperature of the winding needle in the hot coiling process, and P is the pressure of the cold pressing process; based on the mapping model, the temperature T of the winding needle in the hot coiling process of the core and the pressure P of the cold pressing process are adjusted until the layer spacing d of the core is within the first preset range, the layer depth h of the core is within the second preset range, and the layer length L of the core is within the third preset range; wherein y(d, h, L) includes an actual value y1(d1, h1, L1) and a target value y'(d', h', L'); the process steps of adjusting the temperature T of the winding needle in the hot coiling process of the core and the pressure P of the cold pressing process based on the mapping model at least include: based on the actual value y1(d1, h1, L1) and the target value y'(d', h', L'), obtaining a deviation value y2=y1- y'=(d2, h2, L2); set the adjustment threshold (ds, hs, Ls); if d'≤d2≤ds, h'≤h2≤hs and L'≤L2≤Ls, do not make any adjustments and continue monitoring; if d2>ds, T remains unchanged and P is increased; if h2>hs, T and P are increased in turn; if L2>Ls, P remains unchanged and T is increased.

[0007] In some embodiments, the process steps for obtaining the bottom image include: using a CCD camera in an area array type or a line array type to shoot a first bottom image, and obtaining the initial layer spacing and the initial layer length based on the first bottom image; using an ultra-depth of field microscope in an automatic zoom mode to shoot a second bottom image, and obtaining the initial layer depth based on the second bottom image.

[0008] In some embodiments, the process step of acquiring the initial layer spacing based on the first bottom image includes: calculating the initial layer spacing from the positions of the pole piece and the diaphragm in the first bottom image by using a grayscale algorithm and an AI algorithm.

[0009] In some embodiments, the bottom image of the initial roll core is partitioned to obtain the sub-layer spacing and the corresponding sub-layer depth of each area; outliers and noise are removed, and the average value of the sub-layer spacing of all areas is taken as the initial layer spacing, and the average value of the sub-layer depth of all areas is taken as the initial layer depth.

[0010] In some embodiments, after constructing the mapping model, the method further includes: calibrating the mapping model; the process steps of the calibration process include: designing a DOE experimental plan with 2 factors and n levels of T and P, where n is a natural number greater than 0; testing to obtain the corresponding d, h, and L values, and obtaining a (T, P, d, h, L) data set; randomly extracting M% data from the data set as a training set, training the mapping model, and using the remaining data in the data set as a validation set.

[0011] In some embodiments, the mapping model is any one of a machine learning model, a deep learning model, or a neural network model.

[0012] In some embodiments, the first preset range is 0 μm-10 μm; the second preset range is 0 μm-5 μm; and the third preset range is 0 μm-15 μm.

[0013] In some embodiments, the process steps of adjusting the temperature T of the coiling needle in the hot coiling process and the pressure P of the cold pressing process of the coil core based on the mapping model include: based on the actual temperature T1 and the actual pressure P1, obtaining the target temperature T' and the target pressure P' based on the target value y'(d', h', L'), obtaining the deviation temperature △T= T'-T1 and the deviation pressure △P= P'-P1; adjusting the parameters of the hot coiling process based on △T, and adjusting the parameters of the cold pressing process based on △P.

[0014] In some embodiments, after constructing the mapping model, it also includes: establishing a simulation model based on the process of the winding process; adjusting the process parameters of the simulation model based on the mapping model, and obtaining the first parameters of the winding process after simulation; continuing the simulation based on the first parameters of the winding process after simulation until the layer spacing d is within a first preset range, the layer depth h is within a second preset range, and the layer length L is within a third preset range, and obtaining the corresponding second parameters; adjusting the temperature T of the coiling needle in the hot coiling process and the pressure P of the cold pressing process based on the second parameters.

[0015] According to some embodiments of the present application, on the other hand, the embodiments of the present application also provide a winding machine for energy storage battery cell winding processing, including: a loading station, an unwinding station, a hot coiling station, a cold pressing station, an interface detection station and a discharging station; the interface detection station includes: a detection module, the detection module is used to obtain the bottom image of the core after being processed by the cold pressing station; a processing module, the processing module is used to establish a mapping model; an adjustment module, the adjustment module is used to adjust the process parameters of the hot coiling station and the process parameters of the cold pressing station according to the mapping model.

[0016] The technical solution provided by the embodiments of the present application has at least the following advantages:

[0017] The embodiment of the present application provides a control method for the winding process of an energy storage cell to reduce the probability of delamination between the pole piece and the diaphragm. First, the bottom image is acquired, and then a mapping model is established, and the process parameters are adjusted based on the mapping model. The process parameters can be monitored and adjusted in real time, thereby reducing the defective rate of the energy storage cell. Secondly, based on the image of the core obtained by the interface detection process, the closed-loop control and adjustment of the process parameters of the hot coiling can make the fit between the pole piece and the diaphragm in the core better, thereby avoiding undesirable conditions such as wrinkles and brown spots, and further enhancing the interface effect between the diaphragm and the pole piece, and improving the electrical performance and safety of the lithium-ion cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by the figures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the figures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A flow chart of a control method for winding a storage battery cell provided in one embodiment of the present application;

[0020] Figure 2 A flowchart of a winding process of an energy storage cell provided in one embodiment of the present application;

[0021] Figure 3 A cross-sectional view of a winding core provided in one embodiment of the present application;

[0022] Figure 4 for Figure 3 The first partial enlarged view of the diaphragm and the pole piece;

[0023] Figure 5 for Figure 3 Second partial enlargement of the diaphragm and pole piece. DETAILED DESCRIPTION

[0024] As can be seen from the background technology, there is a delamination problem between the diaphragm and the electrode in the current energy storage battery cell, which leads to a poor yield of the energy storage battery cell.

[0025] An embodiment of the present application provides a control method for the winding process of an energy storage battery cell, by adding an interface detection process on the production line and detecting the already formed winding core, and based on the detected data, closed-loop control of relevant parameters of the previous process is performed, thereby improving the problem of stratification between the electrode and the diaphragm.

[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] In the accompanying drawings corresponding to the embodiments of the present application, the thickness and area of ​​the layer are magnified for better understanding and ease of description. When describing a component (such as a layer, a film, a region or a substrate) on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or a third component may be present between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0033] In the description of the embodiments of the present application, when a component "includes" another component, unless otherwise specified, other components are not excluded, and other components may be further included. In addition, when a component such as a layer, film, region, or plate is referred to as "on / located on" another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may exist in between. In addition, when a component such as a layer, film, region, or plate is "directly located on" another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it means that no other components are located in between.

[0034] The terms used in the description of the various embodiments described herein are only used to describe specific embodiments and are not intended to be limiting. As used in the description of the various embodiments described and in the appended claims, "the part" is also intended to include the plural form unless the context clearly indicates otherwise. Among them, a component includes a layer, a film, a region, or a plate.

[0035] The following will describe the various embodiments of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present application, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed in the present application can be implemented.

[0036] Figure 1 A flow chart of a control method for winding a storage battery cell provided in one embodiment of the present application; Figure 2 A flow chart of a winding process of an energy storage cell provided in one embodiment of the present application.

[0037] According to some embodiments of the present application, on the one hand, a control method for winding a storage battery cell is provided. Figure 2 The winding process includes the loading process, unwinding process, hot coiling process, cold pressing process, interface detection process and unloading process. Figure 1The control method includes: obtaining a bottom image of the initial winding core after the cold pressing process, and obtaining the initial layer spacing, initial layer depth and initial layer length of the pole piece and the diaphragm in the initial winding core based on the bottom image; constructing a mapping model of y(d, h, L)=f(T, P) according to the initial temperature of the winding needle in the hot winding process, the initial pressure of the cold pressing process, the initial layer spacing, initial layer depth and initial layer length of the pole piece and the diaphragm in the winding core; wherein d is the layer spacing of the winding core, h is the layer depth of the winding core, L is the layer length of the winding core, T is the temperature of the winding needle in the hot winding process, and P is the pressure of the cold pressing process; based on the The mapping model adjusts the temperature T of the winding needle in the hot coiling process of the core and the pressure P of the cold pressing process until the layer spacing d of the core is within a first preset range, the layer depth h of the core is within a second preset range, and the layer length L of the core is within a third preset range; wherein y(d, h, L) includes an actual value y1(d1, h1, L1) and a target value y'(d', h', L'); the process steps of adjusting the temperature T of the winding needle in the hot coiling process of the core and the pressure P of the cold pressing process based on the mapping model at least include: based on the actual value y1(d1, h1, L1) and the target value y'(d', h', L'), obtaining a deviation value y2=y1- y'=(d2, h2, L2); set the adjustment threshold (ds, hs, Ls); if d'≤d2≤ds, h'≤h2≤hs and L'≤L2≤Ls, do not make any adjustments and continue monitoring; if d2>ds, T remains unchanged and P is increased; if h2>hs, T and P are increased in turn; if L2>Ls, P remains unchanged and T is increased.

[0038] The embodiment of the present application provides a control method for the winding process of an energy storage cell to reduce the probability of delamination between the pole piece and the diaphragm. First, the bottom image is acquired, and then a mapping model is established, and the process parameters are adjusted based on the mapping model. The process parameters can be monitored and adjusted in real time, thereby reducing the defective rate of the energy storage cell. Secondly, based on the image of the core obtained by the interface detection process, the closed-loop control and adjustment of the process parameters of the hot coiling can make the fit between the pole piece and the diaphragm in the core better, thereby avoiding undesirable conditions such as wrinkles and brown spots, and further enhancing the interface effect between the diaphragm and the pole piece, and improving the electrical performance and safety of the lithium-ion cell.

[0039] The above content will be further explained below in conjunction with the film layer structure in the winding core.

[0040] The present application provides a winding processing method for an energy storage battery cell, which includes the steps of loading process, unwinding process, hot winding process, cold pressing process, interface detection process and discharging process in sequence. Compared with the conventional winding process, the first improvement is that: during the winding process, a winding needle is used to heat the winding core being wound, that is, the diaphragm, positive electrode sheet and negative electrode sheet are heated by the winding needle. In this way, the heat emitted by the winding needle during the entire winding process is from the inside to the outside, and the winding needle continuously heats the diaphragm, positive electrode sheet and negative electrode sheet from the inside to the outside, activating the adhesive points on the diaphragm, positive electrode sheet and negative electrode sheet, so that the subsequent cold pressing process and the core forming effect are better, and the interface between the diaphragm and the positive electrode sheet and between the diaphragm and the negative electrode sheet is more tightly fitted. Secondly, compared with the conventional hot pressing process, that is, the large-area contact heating of the heating plate used, the heat is transferred from the outside to the inside, which can improve the stratification problem caused by the internal temperature being lower than the external temperature. The winding needle heating solution provided in the embodiment of the present application makes the temperature in the middle of the winding core higher, that is, the viscosity is better, and the cold pressing process can achieve the bonding of the middle of the winding core. Combined with the hot pressing process, the problem of middle stratification can be improved or solved.

[0041] In addition, in conventional processes, the upper and lower large surfaces and the R-corner area cannot be heated by direct contact, resulting in insufficient heating of the diaphragm glue points and insufficient viscosity. The hot coiling process adopted in the embodiment of the present application achieves 360°C full-surround heating during the winding process, so that the temperature consistency of each area in the core is good, the viscosity of the diaphragm glue points is uniform, and the R-corner interface wrinkle problem is effectively improved.

[0042] The second improvement is to set up an interface detection process, and based on the interface detection results, close-loop control of hot coil parameters and cold pressing parameters, so that the errors in the winding process can be updated in time and online, improving the interface consistency of continuously produced cores, and improving work efficiency and core yield.

[0043] The following will further explain how to control the hot coil parameters and cold pressing parameters in a closed loop based on the interface detection results.

[0044] Figure 3 A cross-sectional view of a winding core provided in one embodiment of the present application; Figure 4 for Figure 3 The first partial enlarged view of the diaphragm and the pole piece; Figure 5 for Figure 3 Second partial enlargement of the diaphragm and pole piece.

[0045] It should be noted that in order to explain and distinguish the diaphragm, the positive electrode sheet and the negative electrode sheet, Figure 3The dotted line indicates the separator, the thinner solid line indicates the negative electrode, and the thicker solid line indicates the positive electrode, but this does not represent the thickness relationship between the separator, the positive electrode, and the negative electrode. Figure 3 There are gaps between the middle diaphragm 3, the positive electrode sheet 1 and the negative electrode sheet 2. This is to clearly indicate the winding correspondence between the diaphragm 3, the positive electrode sheet 1 and the negative electrode sheet 2, but it does not mean that there must be a gap between the diaphragm 3 and the positive electrode sheet 1 or between the diaphragm 3 and the negative electrode sheet 2. In other words, the diaphragm 3 and the positive electrode sheet 1 can be in contact with each other, or the diaphragm 3 and the negative electrode sheet 2 can be in contact with each other.

[0046] Figure 4 The cross-sectional view of the interface correspondence between the qualified pole piece 10 and the diaphragm 3 shows that the pole piece 10 and the diaphragm 3 fit each other without any gap, so that the electrolyte and elements such as lithium ions can directly pass through the interface between the two, thereby improving the migration rate. Figure 3 One of the positive electrode sheet 1 or the negative electrode sheet 2.

[0047] Figure 5 It is a cross-sectional view of the interface correspondence between the unqualified pole piece 10 and the diaphragm 3. There is a delamination problem between the pole piece 10 and the diaphragm 3. Figure 5 The maximum layer distance between the pole piece 10 and the diaphragm 3 is used as the layer spacing, and it can also be the average value of multiple layer regions or the layer spacing of one layer region. Those skilled in the art can use the maximum layer distance in each partition as the layer spacing. For example, if the cross-sectional view includes two or more layer regions, the maximum layer distance in one layer region is selected as the layer spacing.

[0048] In some embodiments, the process step of obtaining the bottom image includes: using a CCD camera to shoot a first bottom image in a planar array type or a linear array type, and obtaining an initial layer spacing and an initial layer length based on the first bottom image; using an ultra-depth of field microscope to shoot a second bottom image in an automatic zoom mode, and obtaining an initial layer depth based on the second bottom image. The first bottom image and the second bottom image are obtained based on two devices, and the first bottom image is shot in a planar array type or a linear array type, which can improve the accuracy of the obtained initial layer spacing and initial layer length.

[0049] It should be noted that Figure 3 In the figure, d represents the layer spacing, L represents the layer length, and d and L are variable values; the initial layer spacing, initial layer length and initial layer depth mentioned above are specific values ​​actually measured.

[0050] The area array type refers to shooting with a pixel matrix. The linear type refers to shooting with a linear method, where the length is much longer than the width, that is, the width of the first bottom image obtained is shorter and the length is longer, thereby having a larger field of view and a higher precision in analyzing the size of the image obtained.

[0051] In some embodiments, the process step of obtaining the initial layer spacing based on the first bottom image includes: calculating the initial layer spacing from the positions of the pole piece and the diaphragm in the first bottom image by using a grayscale algorithm and an AI algorithm. Grayscale algorithm processing and AI algorithm processing of the graphics can avoid errors caused by manually defining the initial layer spacing, thereby improving the accuracy of the initial layer spacing.

[0052] In some embodiments, before acquiring the first bottom image and acquiring the initial layer spacing based on the first bottom image, the camera is calibrated and corrected to reduce errors.

[0053] In some embodiments, the bottom image of the initial roll core is partitioned to obtain the sub-layer spacing and the corresponding sub-layer depth of each area; outliers and noise are removed, and the average value of the sub-layer spacing of all areas is used as the initial layer spacing, and the average value of the sub-layer depth of all areas is used as the initial layer depth. In this way, the bottom image can be partitioned, and then micro-control is performed based on the average value to avoid the adverse effects caused by too little control or too much control caused by the selected area.

[0054] In some embodiments, the mapping model is any of a machine learning model, a deep learning model, or a neural network model.

[0055] Among them, machine learning models are a branch of artificial intelligence and computer science that focuses on using data and algorithms to enable AI to imitate the way humans learn and gradually improve accuracy. Specifically, the model is trained through massive training data so that the model can grasp the potential laws contained in the data and then accurately classify or predict the newly input data.

[0056] Deep learning learns the inherent laws and representation levels of sample data. Based on the acquired text and graphic information, the machine can have analytical learning capabilities like humans and can recognize data such as text, images and sounds. A deep learning model refers to learning the inherent laws and representation levels of sample data and establishing a model that conforms to the laws and levels.

[0057] Neural network is a mathematical model that simulates biological neural network for information processing. It is based on the results of physiological research on the brain, and its purpose is to simulate certain mechanisms and mechanisms of the brain to achieve some specific functions. Neural networks can be divided into three main types: feedforward neural network, feedback neural network and graph neural network.

[0058] In some embodiments, after constructing the mapping model, the mapping model is further calibrated. In this way, the accuracy of the mapping model can be improved, and the mapping model and the bottom image can be integrated based on the mutual conversion relationship between different coordinate systems, and the parameters in the process that affect each parameter in the bottom image can be adjusted based on the mapping model, so as to achieve one-to-one correspondence and multiple calibrations to improve the accuracy.

[0059] In some embodiments, the process steps of the calibration treatment include: designing a DOE experimental scheme of 2 factors of T and P with n levels, where n is a natural number greater than 0; testing to obtain the corresponding d, h, and L values, and obtaining a (T, P, d, h, L) data set; randomly extracting M% of the data from the data set as a training set, training the mapping model, and using the remaining data in the data set as a validation set. Factorial design is a design experiment used to simultaneously study the possible effects of multiple factors on a response. When performing the experiment, changing the levels of all factors at the same time (rather than changing one at a time) allows the interaction between factors to be studied. The one-to-one relationship between the parameters is regulated based on the factorial design, which further proves the accuracy and rationality of the mapping model.

[0060] In some embodiments, M is 50 to 95, wherein M can be 50, 60, 70, 80, 90 or 95.

[0061] In some embodiments, the first preset range is 0 μm to 10 μm. For example, the first preset range may be 0 μm, 3 μm, 5 μm, 7 μm, 9 μm or 10 μm. The value of the first preset range may reduce the gap between the diaphragm and the pole piece, thereby achieving a better interface effect.

[0062] The second preset range is 0 μm to 5 μm. For example, the second preset range may be 0 μm, 1.4 μm, 2.5 μm, 3.1 μm, 4.2 μm or 5 μm.

[0063] The third preset range is 0 μm to 15 μm. For example, the third preset range may be 0 μm, 6 μm, 8 μm, 11 μm, 13 μm or 15 μm.

[0064] In some embodiments, the process steps of adjusting the temperature T of the coiling needle in the hot coiling process and the pressure P in the cold pressing process of the coil core based on the mapping model include: based on the actual temperature T1 and the actual pressure P1, the target temperature T' and the target pressure P' are obtained based on the target value y'(d', h', L'), and the deviation temperature △T= T'-T1 and the deviation pressure △P= P'-P1 are obtained; the parameters of the hot coiling process are adjusted based on △T, and the parameters of the cold pressing process are adjusted based on △P. By adjusting the parameters based on the deviation value, the deviation can be intuitively and clearly seen, and the parameters can be adjusted appropriately, reducing the number of parameter adjustments, and improving the production rate and production cycle.

[0065] In some embodiments, after constructing the mapping model, the following further includes: establishing a simulation model based on the process of the winding process; adjusting the process parameters of the simulation model based on the mapping model, and obtaining the first parameters of the winding process after simulation; continuing the simulation based on the first parameters of the winding process after simulation until the layer spacing d is within the first preset range, the layer depth h is within the second preset range, and the layer length L is within the third preset range, and obtaining the corresponding second parameters; adjusting the temperature T of the coiling needle in the hot coiling process and the pressure P of the cold pressing process based on the second parameters. The process parameters are adjusted first by simulation, and then in actual operation, thereby reducing the preparation cost, and deficiencies can be found in the simulation, and then timely adjusted according to the deficiencies, thereby improving the yield of the battery cells prepared by the continuous process.

[0066] In some embodiments, the adjustment threshold ds is 0-0.1, the adjustment threshold hs is 0-0.05, and the adjustment threshold Ls is 0-0.05.

[0067] The control method for the winding process of the energy storage battery cell provided in the embodiment of the present application is to reduce the probability of stratification between the pole piece and the diaphragm. First, the bottom image is obtained, and then a mapping model is established, and the process parameters are adjusted based on the mapping model. The process parameters can be monitored and adjusted in real time, thereby reducing the defective rate of the energy storage battery cell. Secondly, based on the image of the core obtained by the interface detection process, the closed-loop control and adjustment of the process parameters of the hot coiling can make the fit between the pole piece and the diaphragm in the core better, thereby avoiding undesirable conditions such as wrinkles and brown spots, and then can enhance the interface effect between the diaphragm and the pole piece, and improve the electrical performance and safety of the lithium-ion battery cell.

[0068] Accordingly, according to some embodiments of the present application, the embodiments of the present application further provide a winding machine for energy storage battery cell winding processing, which is used to execute the control method provided in the previous embodiment.

[0069] The winding machine includes: a loading station, an unwinding station, a hot coiling station, a cold pressing station, an interface detection station and a discharging station; the interface detection station includes: a detection module, the detection module is used to obtain the bottom image of the coil core after being processed by the cold pressing station; a processing module, the processing module is used to establish a mapping model; and an adjustment module, the adjustment module is used to adjust the process parameters of the hot coiling station and the process parameters of the cold pressing station according to the mapping model.

[0070] The embodiment of the present application also discloses a terminal device, including a processor and a storage device, the storage device is used to store one or more programs; when one or more programs are executed by the processor, the processor implements the control method of the winding process of the energy storage battery cell. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The so-called processor is the control center of the test equipment, and various interfaces and lines are used to connect the various parts of the entire test equipment.

[0071] The storage device can be used to store computer programs and / or modules. The processor realizes various functions of the terminal device by running or executing the computer programs and / or modules stored in the storage device, and calling the data stored in the storage device. The storage device can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the terminal device, etc. In addition, the storage device can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0072] Among them, if the module / unit integrated in the battery winding detection equipment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in at least one computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0073] It should be noted that the embodiments of the devices and apparatuses described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0074] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present application, and in practical applications, various changes may be made to the embodiments in form and detail without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application, and therefore the scope of protection of the present application shall be subject to the scope defined in the claims.

Claims

1. A control method for winding a storage battery cell, characterized in that: The winding process includes a loading process, an unwinding process, a hot coiling process, a cold pressing process, an interface detection process and a discharging process; the control method includes: Acquire a bottom image of the initial winding core after the cold pressing process, and acquire an initial layer spacing, an initial layer depth, and an initial layer length between the pole piece and the diaphragm in the initial winding core based on the bottom image; According to the initial temperature of the winding needle in the hot rolling process, the initial pressure of the cold pressing process, the initial layer spacing between the pole piece and the diaphragm in the winding core, the initial layer depth and the initial layer length, a mapping model of y(d, h, L)=f(T, P) is constructed; wherein d is the layer spacing of the winding core, h is the layer depth of the winding core, L is the layer length of the winding core, T is the temperature of the winding needle in the hot rolling process, and P is the pressure of the cold pressing process; Adjusting the temperature T of the winding needle in the hot coiling process of the core and the pressure P of the cold pressing process based on the mapping model until the layer spacing d of the core is within a first preset range, the layer depth h of the core is within a second preset range, and the layer length L of the core is within a third preset range; Wherein, y (d, h, L) includes an actual value y1 (d1, h1, L1) and a target value y' (d', h', L'); the process steps of adjusting the temperature T of the coiling needle in the hot coiling process and the pressure P of the cold pressing process of the coil core based on the mapping model at least include: based on the actual value y1 (d1, h1, L1) and the target value y' (d', h', L'), obtaining a deviation value y2=y1- y'=(d2, h2, L2); setting an adjustment threshold (ds, hs, Ls); If d'≤d2≤ds, h'≤h2≤hs and L'≤L2≤Ls, do not make adjustments and continue monitoring; If d2>ds, T remains unchanged, increase P; If h2>hs, increase T and P successively; If L2>Ls, P remains unchanged and T increases.

2. The control method according to claim 1, characterized in that: The process steps for obtaining the bottom image include: using a CCD camera in an area array type or a line array type to shoot a first bottom image, and obtaining the initial layer spacing and the initial layer length based on the first bottom image; using an ultra-depth of field microscope in an automatic zoom mode to shoot a second bottom image, and obtaining the initial layer depth based on the second bottom image.

3. The control method according to claim 2, characterized in that: The process step of acquiring the initial layer spacing based on the first bottom image includes: calculating the initial layer spacing from the positions of the pole piece and the diaphragm in the first bottom image by using a grayscale algorithm and an AI algorithm.

4. The control method according to claim 3, characterized in that: Partitioning the bottom image of the initial core to obtain a sub-layer spacing and a corresponding sub-layer depth in each area; Outliers and noise are removed, and the average value of the sub-layer spacings of all regions is taken as the initial layer spacing, and the average value of the sub-layer depths of all regions is taken as the initial layer depth.

5. The control method according to claim 1, characterized in that: After constructing the mapping model, the method further includes: calibrating the mapping model; the process steps of the calibration process include: Design a DOE experimental plan with 2 factors and n levels of T and P, where n is a natural number greater than 0; The corresponding d, h, and L values ​​are obtained through testing, and the (T, P, d, h, L) data set is obtained; M% of the data is randomly selected from the data set as a training set to train the mapping model, and the remaining data in the data set is used as a validation set.

6. The control method according to claim 1, characterized in that: The mapping model is any one of a machine learning model, a deep learning model or a neural network model.

7. The control method according to claim 1, characterized in that: The first preset range is 0 μm to 10 μm; the second preset range is 0 μm to 5 μm; and the third preset range is 0 μm to 15 μm.

8. The control method according to claim 1, characterized in that: The process steps of adjusting the temperature T of the coiling needle in the hot coiling process and the pressure P of the cold pressing process of the coil core based on the mapping model include: based on the actual temperature T1 and the actual pressure P1, obtaining the target temperature T' and the target pressure P' based on the target value y'(d', h', L'), obtaining the deviation temperature △T= T'-T1 and the deviation pressure △P= P'-P1; adjusting the parameters of the hot coiling process based on △T, and adjusting the parameters of the cold pressing process based on △P.

9. The control method according to claim 1, characterized in that: After building the mapping model, it also includes: establishing a simulation model based on the process of the winding process; adjusting the process parameters of the simulation model based on the mapping model, and obtaining the first parameters of the winding process after simulation; continuing the simulation based on the first parameters of the winding process after simulation until the layer spacing d is within a first preset range, the layer depth h is within a second preset range, and the layer length L is within a third preset range, and obtaining the corresponding second parameters; adjusting the temperature T of the coiling needle in the hot coiling process and the pressure P of the cold pressing process based on the second parameters.

10. A winding machine for executing the control method for winding an energy storage battery core according to any one of claims 1 to 9, characterized in that: include: Loading station, unwinding station, hot coiling station, cold pressing station, interface detection station and discharging station; The interface detection station includes: A detection module, the detection module is used to obtain a bottom image of the core after being processed by the cold pressing station; A processing module, wherein the processing module is used to establish a mapping model; An adjustment module is used to adjust the process parameters of the hot coiling station and the process parameters of the cold pressing station according to the mapping model.

Images