Welding control method and device, electronic equipment, storage medium, program product and welding system

Abstract

The invention relates to a welding control method and device, electronic equipment, a storage medium, a program product and a welding system. The method comprises the following steps: in response to a welding instruction for a battery pole piece, obtaining welding stepping and pole piece information of the battery pole piece; according to the amplitude gain coefficient matched with the pole piece information and the welding stepping, the swing amplitude of the battery pole piece is determined; and carrying out swing welding on the battery pole piece and the collector plate matched with the battery pole piece based on the swing amplitude. By the adoption of the method, the fusion depth consistency and the welding stability in the collector plate welding process can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production control, and in particular to a welding control method, device, electronic equipment, storage medium, program product and welding system. Background Art

[0002] In the production process of cylindrical batteries, collector plate welding is a production step to achieve comprehensive connection between the positive and negative electrodes and the current collector. The welding quality of the collector plate welding can directly affect the stability and safety of battery use.

[0003] In order to improve the welding efficiency and welding quality of collector plate welding, the collector plate welding process currently uses laser welding technology to connect the battery cell end face of the electrode with the collector plate, using the advantages of high precision and high speed of laser welding to meet the technical requirements and quality control needs of collector plate welding.

[0004] However, in the process of using laser welding technology to weld the end face of the battery cell to the current collector, it is easy to increase the welding slag defect rate of the current collector due to excessive or uneven penetration. For example, excessive penetration causes spattering, or defects and unfused conditions occur, which reduces the welding stability of the cylindrical battery collector welding and thus affects the safety performance of the cylindrical battery cell. Summary of the invention

[0005] Based on this, it is necessary to provide a welding control method, device, electronic device, computer-readable storage medium, computer program product and welding system that can improve the penetration consistency and welding stability of the collecting plate welding process in order to solve the above-mentioned technical problems.

[0006] In a first aspect, the present application provides a welding control method, the method comprising:

[0007] In response to a welding instruction for a battery electrode sheet, obtaining welding steps and electrode sheet information of the battery electrode sheet;

[0008] Determining the swing amplitude of the battery electrode according to the amplitude gain coefficient matched with the electrode information and the welding step;

[0009] The battery pole piece and the current collecting plate matched with the battery pole piece are oscillated and welded based on the oscillation amplitude.

[0010] The above-mentioned welding control method can obtain the welding step and electrode information of the battery electrode when it is necessary to perform current collecting plate welding on the battery electrode, determine the amplitude gain coefficient of the battery electrode according to the electrode characteristics of the battery electrode reflected by the electrode information, determine the oscillation amplitude that meets the actual welding situation of the battery electrode based on the amplitude gain coefficient and the welding step of the battery electrode, and perform oscillation welding on the battery electrode and the current collecting plate matching the battery electrode according to the oscillation amplitude. The above welding control method, on the one hand, considers the two dimensions of the electrode characteristics of the battery electrode itself and the basic welding parameters during the welding process, and determines the oscillation amplitude that meets the actual welding conditions of the battery electrode, which can effectively balance the energy distribution during the welding process and reduce the probability of uneven penetration. On the other hand, the oscillation amplitude is determined based on the amplitude gain coefficient and the welding step, so that the final oscillation amplitude is not less than the welding step during the welding process. When oscillating welding is subsequently performed according to the oscillation amplitude, the welding trajectories of adjacent oscillation areas can overlap, further reducing the risk of uneven penetration or unfusion defects, effectively improving the penetration consistency and welding stability of the collector plate welding process, and thereby improving the safety performance of the cylindrical battery cell.

[0011] In some embodiments, the method further comprises:

[0012] Obtaining a welding oscillation frequency of the battery electrode sheet and a welding speed determined based on production parameters of the battery electrode sheet;

[0013] The ratio of the welding speed to the welding oscillation frequency is determined as the welding step of the battery electrode.

[0014] In the above embodiment, the welding step of the battery electrode is determined by the welding speed and welding oscillation frequency of the battery electrode, so that the subsequent oscillation amplitude determined based on the welding step can meet any welding speed requirements, that is, the production cycle requirements. Even in the case of high-speed welding, the stability of the welding process can be improved by welding based on the oscillation amplitude determined by the welding step.

[0015] In some embodiments, the swing welding of the battery pole piece and the current collecting plate matched with the battery pole piece based on the swing amplitude includes:

[0016] Flattening the battery electrode to obtain a flattened electrode end surface;

[0017] When it is determined that the oscillation amplitude satisfies an amplitude correction condition according to the end surface gap information of the flattened end surface of the electrode, an amplitude correction value of the oscillation amplitude is determined;

[0018] summing the amplitude correction value and the swing amplitude to obtain a target swing amplitude for performing a welding operation;

[0019] According to the target swing amplitude, the flattened end surface of the electrode and the current collecting plate matched with the battery electrode are oscillated and welded.

[0020] In the above embodiment, the amplitude of the swing amplitude is corrected by using the end surface pore gap information of the flattened end surface of the electrode, so that the final target swing amplitude can not only meet the welding requirements corresponding to the welding step, but also match the actual pore conditions of the flattened end surface of the electrode. When the target swing amplitude is subsequently used for swing welding, the penetration consistency and welding stability of the collector plate welding process can be effectively improved, thereby improving the safety performance of the cylindrical battery cell.

[0021] In some embodiments, the end surface pore information includes the pore diameter and pore position of each pore in the flattened end surface of the electrode; the method further includes:

[0022] Determining the welding quality correlation of each of the pores according to the position of each of the pores;

[0023] For each of the pores, when the welding quality correlation of the pore is greater than or equal to a preset correlation threshold, the pore is determined as a key pore of the electrode flattened end surface;

[0024] Comparing the pore diameter of each of the key pores with the theoretical pore specifications corresponding to the oscillation amplitude;

[0025] In the case that abnormal pores having pore diameters larger than the theoretical pore size exist in each of the key pores, it is determined that the oscillation amplitude satisfies the amplitude correction condition.

[0026] In the above embodiment, by calculating the welding quality correlation of each pore, the key pores that have a greater impact on the welding quality are determined from multiple end surface pores, and based on the pore diameters of the key pores, it is determined whether the oscillation amplitude meets the amplitude correction conditions, which can effectively reduce the correction amplitude of the oscillation amplitude and improve the accuracy and correction efficiency of the oscillation amplitude correction.

[0027] In some embodiments, determining the amplitude correction value of the swing amplitude includes:

[0028] According to the pore diameters of the abnormal pores, the abnormal pore with the largest pore diameter is determined as the corrected reference pore;

[0029] Calculating the diameter difference between the pore diameter of the modified reference pore and the diameter of the theoretical pore specification;

[0030] When the diameter difference is less than a correction threshold, determining the diameter difference as an amplitude correction value of the swing amplitude;

[0031] When the diameter difference is greater than or equal to the correction threshold, the correction threshold is determined as an amplitude correction value of the swing amplitude.

[0032] In the above embodiment, by setting the correction threshold of the swing amplitude, the risk of excessive correction of the swing amplitude can be effectively reduced, thereby improving the welding quality of the collector plate.

[0033] In some embodiments, the flattening of the battery electrode sheet to obtain the flattened electrode end surface includes:

[0034] Based on the oscillation amplitude, determining the theoretical pore size of the flattened end surface of the battery electrode;

[0035] Determining the flattening control parameters of the battery electrode sheet according to the theoretical pore specifications;

[0036] The battery electrode is flattened according to the flattening control parameters to obtain a flattened electrode end face.

[0037] In the above embodiment, by reversely determining the flattening parameters according to the oscillation amplitude determined by the welding step, the regularity of the flattened end surface of the electrode obtained by the flattening process can be more closely matched with the oscillation amplitude, thereby reducing the probability of abnormal pores on the flattened end surface of the electrode and improving the welding quality.

[0038] In some embodiments, the method further comprises:

[0039] Acquiring a kneaded end surface image of the kneaded end surface of the electrode;

[0040] Based on the flattened end surface image, end surface contaminant detection is performed on the flattened end surface of the electrode to obtain contamination information of the flattened end surface;

[0041] Determining cyclone dust removal parameters of the electrode flattened end surface before welding according to the flattened end surface dirt information;

[0042] The flattened end surface of the electrode is subjected to cyclone dust removal according to the cyclone dust removal parameters.

[0043] In the above embodiment, the flattened end face of the electrode is detected for end face contaminants by using the flattened end face image, so that the flattened end face contamination information of the electrode can be quickly obtained, and the cyclone dust removal parameters can be determined based on the flattened end face contamination information, so that the cyclone dust removal parameters can be matched with the actual contamination situation of the flattened end face, thereby improving the cyclone dust removal efficiency and reducing the energy consumption of the cyclone dust removal.

[0044] In some embodiments, the cyclone dust removal parameters include cyclone dust removal air pressure; the cyclone dust removal parameters of the electrode flattened end surface before welding are determined according to the flattened end surface dirt information, including:

[0045] Acquire the electrode piece welding failure information within a preset production cycle, the first air pressure related weight corresponding to the electrode piece welding failure information, and the second air pressure related weight corresponding to the flattened end surface contamination information;

[0046] Determine a first dust removal air pressure that matches the electrode piece welding failure information and a second dust removal air pressure that matches the flattened end surface dirt information;

[0047] The cyclone dust removal pressure of the electrode flattened end surface before welding is determined according to the first dust removal pressure, the first pressure-related weight, the second dust removal pressure, and the second pressure-related weight.

[0048] In the above embodiment, when determining the cyclone dust removal parameters, the relative importance of the flattened end face dirt information and the poor electrode welding information to the determination of the cyclone dust removal air pressure is taken into consideration, which can effectively improve the matching of the final determined cyclone dust removal air pressure with the battery electrode welding conditions, thereby improving the accuracy of the final determined cyclone dust removal air pressure.

[0049] In some embodiments, the method further comprises:

[0050] Acquire an end surface image of the electrode collector disk after welding;

[0051] According to the collector plate end surface image, end surface contaminant detection is performed on the end surface of the electrode collector plate to obtain contamination information of the collector plate end surface;

[0052] Determining brush dust removal parameters of the end surface of the electrode current collector disk based on the dirt information of the end surface of the current collector disk;

[0053] The end surface of the electrode current collecting plate is subjected to brush dust removal treatment according to the brush dust removal parameters.

[0054] In the above embodiment, the end face contaminants of the electrode collector plate are detected by using the end face image of the collector plate, so that the contamination information of the collector plate end face of the electrode flattened end face can be quickly obtained, and the brush dust removal parameters are determined according to the contamination information of the collector plate end face. The brush dust removal parameters can be matched with the actual contamination situation of the collector plate end face, thereby improving the dust removal efficiency of the brush and reducing the energy consumption of the dust removal by the brush.

[0055] In a second aspect, the present application also provides a welding control device, the device comprising:

[0056] An instruction response module, used for obtaining welding steps and electrode information of the battery electrode in response to a welding instruction for the battery electrode;

[0057] An amplitude determination module, used to determine the swing amplitude of the battery pole piece according to the amplitude gain coefficient matched with the pole piece information and the welding step;

[0058] A welding control module is used to perform swing welding on the battery pole piece and a current collecting plate matched with the battery pole piece based on the swing amplitude.

[0059] In a third aspect, the present application further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0060] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of the above method when executed by a processor.

[0061] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of the above method when executed by a processor.

[0062] In a sixth aspect, the present application further provides a welding system, the welding system comprising a welding assembly and a controller communicatively connected to the welding assembly;

[0063] The welding assembly is used to perform a swing welding operation on a battery electrode piece and a current collecting plate matched with the battery electrode piece;

[0064] The controller is used to implement the steps of the above method.

[0065] The above-mentioned welding control method, device, electronic device, storage medium, computer program product and welding system can obtain the welding step and electrode information of the battery electrode when it is necessary to perform current collector welding on the battery electrode, determine the amplitude gain coefficient of the battery electrode according to the electrode characteristics of the battery electrode reflected by the electrode information, determine the oscillation amplitude that meets the actual welding condition of the battery electrode based on the amplitude gain coefficient and the welding step of the battery electrode, and perform oscillation welding on the battery electrode and the current collector matching the battery electrode according to the oscillation amplitude. The above welding control method, on the one hand, considers the two dimensions of the electrode characteristics of the battery electrode itself and the basic welding parameters during the welding process, and determines the oscillation amplitude that meets the actual welding conditions of the battery electrode, which can effectively balance the energy distribution during the welding process and reduce the probability of uneven penetration. On the other hand, the oscillation amplitude is determined based on the amplitude gain coefficient and the welding step, so that the final oscillation amplitude is not less than the welding step during the welding process. When oscillating welding is subsequently performed according to the oscillation amplitude, the welding trajectories of adjacent oscillation areas can overlap, further reducing the risk of uneven penetration or unfusion defects, effectively improving the penetration consistency and welding stability of the collector plate welding process, and thereby improving the safety performance of the cylindrical battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 is a structural block diagram of a welding system in some embodiments;

[0067] Figure 2 A structural block diagram of a welding system in some other embodiments;

[0068] Figure 3 A schematic diagram of a welding control method in some embodiments;

[0069] Figure 4 It is a schematic diagram of a process of swing welding a battery pole piece and a current collecting plate matched with the battery pole piece based on the swing amplitude in some embodiments;

[0070] Figure 5 A schematic diagram of a flow chart of a welding control method in some other embodiments;

[0071] Figure 6 A schematic diagram of a flow chart for determining an amplitude correction value of a swing amplitude in some embodiments;

[0072] Figure 7 A schematic diagram of a process for flattening a battery electrode sheet to obtain a flattened electrode end surface in some embodiments;

[0073] Figure 8 A schematic diagram of a flow chart of a welding control method in some other embodiments;

[0074] Fig. 9 A schematic diagram of a process for determining cyclone dust removal parameters of the flattened end surface of the electrode before welding according to the dirt information of the flattened end surface in some embodiments;

[0075] Fig.10 A schematic diagram of a flow chart of a welding control method in some other embodiments;

[0076] Fig.11 A schematic diagram of a flow chart of a preparation stage of a welding control method in some embodiments;

[0077] Fig.12 A schematic diagram of the swing amplitude and the welding step in some embodiments;

[0078] Fig.13 A schematic diagram of a flow chart of an actual welding stage of a welding control method in some embodiments;

[0079] Fig.14 A schematic diagram of a flow chart of a post-welding detection phase of a welding control method in some embodiments;

[0080] Fig.15 A schematic diagram of a qualified swing trajectory in some embodiments;

[0081] Fig.16A schematic diagram showing a comparison of the metallographic morphology after swing welding and the metallographic morphology after conventional welding in some embodiments;

[0082] Fig.17 A schematic diagram of welding line distribution of welding tracks in some embodiments;

[0083] Fig.18 is a structural block diagram of a welding control device in some embodiments;

[0084] Fig.19 1 is a diagram of the internal structure of an electronic device in some embodiments. DETAILED DESCRIPTION

[0085] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0087] Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least some embodiments of the present application. The appearance of the phrase in various places 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.

[0088] 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).

[0089] 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.

[0090] 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.

[0091] Collector plate welding is a production step to achieve full connection between the positive and negative electrodes and the current collector. It refers to the battery production process of accurately connecting the cell end faces of the battery pole pieces with the collector plate to achieve full connection between the positive and negative electrodes of the battery and the current collector, so that the current can flow smoothly inside the battery.

[0092] At present, the collector plate welding process uses laser welding technology to connect the battery cell end face of the electrode with the collector plate. However, when using laser welding technology to weld the battery cell end face and the collector plate, traditional solutions use fixed-point laser welding, continuous laser welding, or swing welding with fixed swing parameters, which is prone to excessive penetration and uneven penetration, increasing the welding slag defect rate of the collector plate welding, reducing the welding stability of the cylindrical battery collector plate welding, and thus affecting the safety performance of the cylindrical battery cell.

[0093] In order to improve the safety performance of cylindrical battery cells, when it is necessary to weld the battery electrode to the collector plate, the welding step and electrode information of the battery electrode can be obtained, and the amplitude gain coefficient of the battery electrode can be determined according to the electrode characteristics of the battery electrode reflected by the electrode information. Based on the amplitude gain coefficient and the welding step of the battery electrode, the oscillation amplitude that meets the actual welding situation of the battery electrode is determined, and the battery electrode and the collector plate matching the battery electrode are oscillated according to the oscillation amplitude. The above welding control method, on the one hand, considers the two dimensions of the electrode characteristics of the battery electrode itself and the basic welding parameters during the welding process, and determines the oscillation amplitude that meets the actual welding conditions of the battery electrode, which can effectively balance the energy distribution during the welding process and reduce the probability of uneven penetration. On the other hand, the oscillation amplitude is determined based on the amplitude gain coefficient and the welding step, so that the final oscillation amplitude is not less than the welding step during the welding process. When oscillating welding is subsequently performed according to the oscillation amplitude, the welding trajectories of adjacent oscillation areas can overlap, further reducing the risk of uneven penetration or unfusion defects, effectively improving the penetration consistency and welding stability of the collector plate welding process, and thereby improving the safety performance of the cylindrical battery cell.

[0094] The welding control method provided in the embodiment of the present application can be applied to Figure 1 In the welding system shown in FIG. , the welding system includes a welding assembly 101 and a controller 102 which is in communication with the welding assembly 101 .

[0095] The welding assembly 101 is used to perform a swing welding operation on a battery electrode and a current collecting plate matching the battery electrode.

[0096] Among them, the welding assembly 101 is an equipment assembly that performs the swing welding task, which can generate and emit laser, focus the laser beam on the welding position of the battery pole piece and the collector plate, and heat the material at the welding position to a molten state through a high energy density heat source. During the melting process, the material will form a molten pool and mix with each other. As the laser beam moves, the molten pool gradually cools and solidifies to form a firm weld and complete the welding operation. It can be understood that the welding assembly 101 may include a laser for generating and emitting laser. The laser is the core device for generating a high-intensity laser beam in the welding assembly 101. The laser in the welding assembly 101 can be any laser that can emit a high-intensity laser beam, such as a multimode fiber laser.

[0097] In some embodiments, the welding assembly 101 may include a single-mode annular spot continuous fiber laser. A single-mode annular continuous fiber laser refers to an annular fiber laser that can generate a single mode of emitted light, and its beam quality factor, i.e., M 2 The factor is close to 1, the beam quality is high, the energy distribution is uniform, the divergence angle is small, it has the advantages of high spatial coherence, stable phase and polarization characteristics, and the single-mode ring continuous fiber laser has weak thermal penetration effect and high long-term operation stability, which is suitable for long-term continuous operation. Therefore, the use of single-mode ring spot continuous fiber laser can effectively improve the welding quality of battery pole piece and collector plate welding through its advantages of high precision, high stability and high energy density.

[0098] In some of the embodiments, the welding assembly 101 may further include a turning member for turning over the object to be welded, such as a turning machine, and a fixing member for fixing the object to be welded, such as a fixing clamp.

[0099] The controller 102 may be any control component with logic execution capability, such as an MCU, a micro control unit, etc.

[0100] In some embodiments, the controller 102 can respond to welding instructions for battery electrodes, obtain the welding step and electrode information of the battery electrode, determine the oscillation amplitude of the battery electrode according to the amplitude gain coefficient and the welding step matching the electrode information, and based on the oscillation amplitude and other welding parameters, such as welding step, welding frequency, etc., control the welding assembly 101 to perform oscillation welding on the battery electrode and the current collecting plate matching the battery electrode.

[0101] In the above embodiment, the controller 102 in the welding system can consider the two dimensions of the electrode characteristics of the battery electrode itself and the basic welding parameters during the welding process, and determine the oscillation amplitude that meets the actual welding conditions of the battery electrode. It can effectively balance the energy distribution during the welding process and reduce the probability of uneven penetration. The oscillation amplitude can also be determined based on the amplitude gain coefficient and the welding step, so that the final oscillation amplitude is not less than the welding step during the welding process. When oscillation welding is subsequently performed according to the oscillation amplitude, the welding trajectories of adjacent oscillation areas can overlap, further reducing the risk of uneven penetration or unfusion defects, effectively improving the penetration consistency and welding stability of the collector plate welding process, and thereby improving the safety performance of the cylindrical battery cell.

[0102] In some embodiments, the welding system further comprises a flattening assembly connected to the controller for communication. The flattening assembly is used to flatten the battery electrode to obtain a flattened electrode end surface.

[0103] Among them, the flattening treatment is a pretreatment operation before the welding of the battery pole piece and the collector plate. Its purpose is to shape and squeeze the full pole ears at both ends of the positive and negative poles of the battery core, so that the battery pole piece exposes the dense electrode end surface. Through shaping and squeezing, the contact area between the full pole ear and the collector plate can be made larger and more uniform, thereby improving the welding quality and stability. The flattening component is an equipment component that performs flattening treatment on the battery pole piece. For example, the flattening component may include a shaping component and a squeezing component, wherein the shaping component is used to shape the pole ears at both ends of the positive and negative poles of the battery core, so that it changes from a curled state to a flat state. The squeezing component is used to squeeze the full pole ear on the basis of shaping.

[0104] In some embodiments, the controller can control the flattening assembly to flatten the battery electrode to obtain a flattened electrode end face.

[0105] In some embodiments, the controller can determine the theoretical pore specification information of the flattened end face of the battery electrode based on the swing amplitude, determine the flattening control parameters of the battery electrode according to the theoretical pore specification information, and control the flattening component to flatten the battery electrode according to the flattening control parameters to obtain the flattened end face of the electrode.

[0106] In the above embodiment, the controller is connected to the flattening component through communication, and can reversely determine the flattening control parameters of the battery electrode during flattening pretreatment according to the obtained oscillation amplitude, which can improve the matching degree between the flattening process and the ideal oscillation amplitude, thereby improving the end surface quality of the flattened end surface of the electrode obtained after flattening.

[0107] In some embodiments, the welding system further comprises a cyclone dust removal component that is in communication connection with the controller. The cyclone dust removal component is used to perform cyclone dust removal on the flattened end surface of the electrode.

[0108] Among them, when welding the collector plate to the flattened end face of the electrode, due to the influence of the cleanliness of the welding environment and the inevitable movement operation during the welding process, it is easy for the flattened end face of the electrode to be adsorbed or contaminated with impurities. If the welding operation is directly performed on the flattened end face of the electrode with impurities, the welding quality of the collector plate will be greatly reduced, and the welding slag defect rate of the battery collector plate will be increased.

[0109] Taking the battery cathode of a cylindrical battery as an example, when welding the collector plate of a cylindrical battery, the collector plate is usually welded to the battery anode first, and then the battery cell is flipped over, and then the collector plate is welded to the battery cathode. During the flipping process, the flattened end face of the battery cathode will inevitably come into direct or indirect contact with equipment such as the support cup, logistics belt, and flip machine tooling, causing the flattened end face of the cathode to adsorb impurities, which is likely to form pinhole explosion points during welding, increasing the defective rate of welding slag, and thereby increasing the risk of battery self-discharge, seriously affecting the safety performance of the battery cell.

[0110] Therefore, in order to reduce the influence of impurities on the welding quality of the collector plate, a cyclone dust removal component can be set in the welding system to perform cyclone dust removal on the flattened end surface of the electrode before welding.

[0111] Among them, the dust removal principle of the cyclone dust removal assembly is to remove impurities, such as metal debris, dust and other pollutants, from the flattened end surface of the electrode by blowing out a cyclonic airflow and adding local vacuum adsorption. It can be understood that the cyclone dust removal assembly can be installed at any position of the welding system, as long as the flattened end surface of the electrode before welding can be subjected to cyclone dust removal. For example, the cyclone dust removal assembly can be arranged at the cell feed port of the electrode welding process, at a preset distance from the flattened end surface of the electrode. In some of the embodiments, the preset distance can range from 15 to 20 millimeters (mm), which can reduce the risk of bumping into the cell due to the close distance, and also reduce the risk of reduced dust removal effect due to the long distance between the cyclone dust removal assembly and the flattened end surface of the electrode.

[0112] In some embodiments, the cyclone dust removal device includes an air inlet pipe, a dust cover, an exhaust pipe, etc., wherein the dust cover is used to guide the dust removal airflow to improve the dust removal effect. In order to improve the overall dust removal effect of the flattened end surface of the electrode, it is understandable that the diameter of the dust cover can be designed to be larger than the cell diameter of the flattened end surface of the electrode.

[0113] In some of the embodiments, in addition to performing cyclone dust removal on the flattened end face of the electrode before welding, the cyclone dust removal device can also perform cyclone dust removal on the collecting plate before welding, so as to improve the overall welding effect by simultaneously improving the cleanliness of the flattened end face of the electrode and the collecting plate waiting to be welded before welding.

[0114] In some embodiments, the controller can control the cyclone dust removal assembly to perform cyclone dust removal on the flattened end surface of the electrode when the flattened end surface of the electrode is transmitted to the welding process.

[0115] In some embodiments, the controller can obtain a flattened end surface image of the electrode flattened end surface, perform end surface contaminant detection on the electrode flattened end surface based on the flattened end surface image, obtain flattened end surface contamination information, and determine the cyclone dust removal parameters of the electrode flattened end surface before welding according to the flattened end surface contamination information. Then, the cyclone dust removal component can be controlled to perform cyclone dust removal on the electrode flattened end surface according to the cyclone dust removal parameters.

[0116] In the above embodiment, by setting a cyclone dust removal component in the welding process, the flattened end face of the electrode flowing into the welding process ready for current collecting plate welding can be dusted, which can effectively improve the cleanliness of the end face of the electrode flattened end face during welding, thereby improving the subsequent welding quality of the electrode flattened end face and the current collecting plate.

[0117] In some embodiments, the welding system further comprises a brush dust removal assembly connected to the controller for brush dust removal on the end surface of the electrode collector plate obtained after the battery electrode sheet is welded.

[0118] Among them, after the current collector plate welding of the battery pole piece is completed and the electrode current collector plate end face is obtained, the electrode current collector plate end face is generally subjected to appearance inspection, for example, the image of the electrode current collector plate end face is collected by a charge coupled device (CCD), and the defect detection and judgment of the electrode current collector plate end face are performed based on the collected image. Only the products judged to be qualified, that is, OK, can enter the next production process.

[0119] Therefore, in order to improve the qualified rate of products after welding and reduce the probability of appearance inspection failure due to impurities adhering to the end surface of the electrode collector disk, a brush dust removal component can be set in the welding system to perform brush dust removal on the end surface of the electrode collector disk after welding.

[0120] Among them, the dust removal principle of the brush dust removal assembly is to remove impurities on the end surface of the electrode current collector disk, such as welding ash and slag generated during welding, by lifting and rotating the brush when it contacts the end surface of the electrode current collector disk. It can be understood that the brush dust removal assembly can be installed at any position of the welding system as long as the brush dust removal operation can be performed on the end surface of the electrode current collector disk after welding. For example, the brush dust removal assembly can be set at the discharge port of the electrode welding process.

[0121] In some of the embodiments, the brush dust removal assembly may include a driving member and a brush, the driving member is communicatively connected with the controller, and the brush can be lifted and rotated under the drive of the driving member.

[0122] In some of the embodiments, the brush dust removal assembly may further include a dust removal hood and a dust removal duct, and the impurities removed from the end surface of the electrode current collecting plate may pass through the dust removal hood, enter the dust removal duct and flow out of the production area.

[0123] In some embodiments, the controller can obtain an end face image of the electrode current collector disk after the battery electrode is welded and the end face of the electrode current collector disk is obtained; perform end face contaminant detection on the end face of the electrode current collector disk based on the end face image to obtain the degree of dirtiness of the end face of the current collector disk; determine the brush dust removal parameters of the end face of the electrode current collector disk based on the degree of dirtiness of the end face of the current collector disk; and control the brush dust removal component to perform brush dust removal on the end face of the electrode current collector disk according to the brush dust removal parameters.

[0124] In the above embodiment, by providing a brush dust removal assembly during the welding process, the end face of the electrode collector disk that is about to flow out of the welding process can be dusted, which can effectively improve the cleanliness of the end face of the product obtained after welding, thereby improving the pass rate of subsequent end face appearance inspection and reducing the welding slag defect rate of the battery collector disk welding.

[0125] In some embodiments, Figure 2 As shown, a welding system is provided, which includes a welding component 101, a flattening component 103, a cyclone dust removal component 104, a brush dust removal component 105, and a controller 102 which is communicatively connected to the welding component 101, the flattening component 103, the cyclone dust removal component 104 and the brush dust removal component 105 respectively.

[0126] Among them, the welding assembly 101 is used to perform an oscillating welding operation on the battery pole piece and the collector disk matched with the battery pole piece, and includes a heat source component for providing a welding heat source, such as a single-mode annular spot continuous fiber laser 1011 that provides a laser beam. The flattening assembly 103 is used to flatten the battery pole piece to obtain a flattened electrode end face. The cyclone dust removal assembly 104 is used to perform a cyclone dust removal on the flattened electrode end face before welding. The brush dust removal assembly 105 is used to perform a brush dust removal on the end face of the electrode collector disk obtained after the battery pole piece welding is completed.

[0127] The controller 102 will implement all control steps in the battery electrode collector plate welding process, and the specific implementation method is described in detail in the specific method embodiment of the welding control method below.

[0128] In some embodiments, Figure 3 As shown, a welding control method is provided, which is applied to Figure 1 Taking the controller 102 as an example, the method includes the following steps:

[0129] S302, in response to a welding instruction for a battery electrode, obtaining welding steps and electrode information of the battery electrode.

[0130] Among them, the welding instruction is a command signal for instructing the collector plate welding operation on the battery electrode. It can be understood that the welding instruction can be manually triggered by the production staff of the battery production based on the actual production situation, for example, the welding instruction for the battery electrode is sent to the controller through the work terminal of the production staff. It can also be automatically triggered by the monitoring system in the battery production process. For example, when the monitoring system detects that the battery electrode has been completed in the previous production process of the welding process, the welding instruction for the battery electrode can be automatically triggered.

[0131] Among them, the battery pole piece is the core part of the battery that converts chemical energy into electrical energy. A battery usually includes an anode pole piece and a cathode pole piece. During the welding process of the collector plate, the anode pole piece and the cathode pole piece of the battery need to be welded to their respective matching collector plates, so that the battery can efficiently transmit electrical energy during operation. The battery pole piece in this embodiment can be any pole piece in the battery that needs to be welded to the collector plate, that is, when the anode pole piece or the cathode pole piece in the battery is welded to the collector plate, the welding control method in this embodiment can be used to reduce the welding slag defect rate of the collector plate welding.

[0132] Among them, the welding step of the battery electrode is used to characterize the single movement distance generated by each swing of the welding laser beam generated by the welding assembly along the welding direction during the welding process of the battery electrode. In swing welding, the laser beam will move linearly along the weld direction, accompanied by swinging perpendicular to the weld direction. Therefore, the welding direction can be considered as the movement direction parallel to the weld, that is, the movement direction of the laser beam when it moves linearly.

[0133] In some of the embodiments, the welding step of the battery electrode can be set by the production personnel according to the actual production situation, and the controller can obtain the welding step manually set by the production personnel according to the electrode identification of the battery electrode.

[0134] Among them, the electrode information of the battery electrode is information data used to characterize the welding characteristics of the battery electrode. Different electrode information of the battery electrode has different corresponding welding characteristics, and the corresponding optimal welding control parameters during welding will also be different. Therefore, when welding the collector plate of the battery electrode, the welding characteristics reflected by the electrode information of the battery electrode can be considered to determine the swing amplitude for the battery electrode that is more in line with the actual situation of the battery electrode. For example, the electrode information may include the electrode material and / or electrode thickness of the battery electrode. If the electrode material or electrode thickness of the battery electrode is different, the corresponding swing amplitude will also be different.

[0135] In some of the embodiments, the controller may be connected to a production management system, and obtain the electrode information of the battery electrode from the production management system according to the electrode identification of the battery electrode.

[0136] In some embodiments, the controller may obtain the welding step and electrode information of the battery electrode in response to a welding instruction for the battery electrode.

[0137] S304, determining the swing amplitude of the battery pole piece according to the amplitude gain coefficient matched with the pole piece information and the welding step.

[0138] Among them, the swing amplitude is twice the maximum distance that the laser beam deviates from the center point in the swing trajectory during the welding process. The larger the swing amplitude, the wider the laser action area and the more dispersed the energy distribution, which helps to reduce the depth of penetration and increase the width of the weld. The smaller the swing amplitude, the more concentrated the energy will be, resulting in increased depth of penetration and possible spatter. Although a larger amplitude can correspond to a wider laser action area and a more uniform energy distribution, an excessively large swing amplitude can also lead to the problem of shallow penetration. In order to set the swing amplitude within a reasonable range, the basic swing amplitude corresponding to the welding step can be used as a benchmark to determine a reasonable welding swing amplitude.

[0139] Since the welding step represents the single movement distance generated by each swing of the welding laser beam generated by the welding assembly along the welding direction during the welding process of the battery electrode, it is only necessary to make the swing amplitude not less than the welding step. When the welding swings, the energy distribution during the swing welding can be adjusted, and the swing trajectory can be overlapped, thereby reducing the probability of uneven penetration or unfusion defects.

[0140] Among them, the amplitude gain coefficient is the amplitude coefficient used to amplify the basic swing amplitude obtained based on the welding step, which can be used to characterize the degree to which the amplitude needs to be amplified. After the basic swing amplitude corresponding to the welding step is determined according to the welding step, in order to improve the matching between the swing amplitude and the battery pole piece to be welded, it is also necessary to consider the welding characteristics of the battery pole piece due to its own characteristics. Therefore, the amplitude gain coefficient that matches the pole piece information can be determined based on the pole piece information. For example, the thicker the pole piece thickness of the battery pole piece, the larger the corresponding amplitude gain coefficient. Conversely, the thinner the pole piece thickness of the battery pole piece, the smaller the corresponding amplitude gain coefficient.

[0141] In some embodiments, the controller can determine the amplitude gain coefficient that matches the pole piece information based on the pole piece information of the battery pole piece, and at the same time determine the basic oscillation amplitude corresponding to the welding step, and based on the amplitude gain coefficient and the basic oscillation amplitude, determine the oscillation amplitude of the battery pole piece when performing the welding operation.

[0142] In some of the embodiments, the controller can obtain the preset correspondence between each pole piece information and each amplitude gain coefficient from the production management system according to the pole piece identification of the battery pole piece, and based on the pole piece information of the battery pole piece, search for the amplitude gain coefficient that matches the pole piece information of the battery pole piece from the preset correspondence.

[0143] In some of the embodiments, the controller may determine the product of the amplitude gain coefficient and the basic swing amplitude as the swing amplitude when the battery pole piece performs a welding operation, and the amplitude gain coefficient is greater than 1. For example, the controller determines that the basic swing amplitude is 0.3 according to the welding step, and the amplitude gain coefficient matching the pole piece information is 1.5, then the swing amplitude of the battery pole piece can be determined to be A=0.3×1.5=0.45.

[0144] In some embodiments, the controller may determine the sum of the amplitude gain coefficient and the basic swing amplitude as the swing amplitude when the battery pole piece performs a welding operation. For example, the controller determines that the basic swing amplitude is 0.3 according to the welding step, and the amplitude gain coefficient matching the pole piece information is 0.15, then the swing amplitude of the battery pole piece A=0.3+0.15=0.45 can be determined.

[0145] S306, performing swing welding on the battery pole piece and the current collecting plate matched with the battery pole piece based on the swing amplitude.

[0146] In some embodiments, after obtaining the swing amplitude, the controller can swing weld the battery pole piece and the current collecting plate matching the battery pole piece based on the swing amplitude. For example, the controller can directly control the welding assembly to emit a laser beam to swing weld the pre-treated battery pole piece and the current collecting plate matching the battery pole piece according to the swing amplitude and other welding control parameters, such as welding speed, welding swing frequency, etc.

[0147] In some of the embodiments, the swing welding process is a periodic swing welding process, and the controller can use any swing welding mode to perform the swing welding operation, and the swing welding mode includes but is not limited to circular swing, linear swing, figure 8 swing, infinity swing, etc.

[0148] In some of the embodiments, the swing welding mode used in the swing welding process is circular swing welding, that is, the laser beam moves in a circular motion around the center of the weld. This swinging mode enables the laser beam heat source to evenly heat the weld area, which helps to reduce welding deformation and weld metal coarsening.

[0149] The above-mentioned welding control method can obtain the welding step and electrode information of the battery electrode when it is necessary to perform current collecting plate welding on the battery electrode, determine the amplitude gain coefficient of the battery electrode according to the electrode characteristics of the battery electrode reflected by the electrode information, determine the oscillation amplitude that meets the actual welding situation of the battery electrode based on the amplitude gain coefficient and the welding step of the battery electrode, and perform oscillation welding on the battery electrode and the current collecting plate matching the battery electrode according to the oscillation amplitude. The above welding control method, on the one hand, considers the two dimensions of the electrode characteristics of the battery electrode itself and the basic welding parameters during the welding process, and determines the oscillation amplitude that meets the actual welding conditions of the battery electrode, which can effectively balance the energy distribution during the welding process and reduce the probability of uneven penetration. On the other hand, the oscillation amplitude is determined based on the amplitude gain coefficient and the welding step, so that the final oscillation amplitude is not less than the welding step during the welding process. When oscillating welding is subsequently performed according to the oscillation amplitude, the welding trajectories of adjacent oscillation areas can overlap, further reducing the risk of uneven penetration or unfusion defects, effectively improving the penetration consistency and welding stability of the collector plate welding process, and thereby improving the safety performance of the cylindrical battery cell.

[0150] The welding step is an important parameter for determining the basic oscillation amplitude and has a great influence on the welding quality. In some embodiments, the welding control method further includes: obtaining the welding oscillation frequency of the battery pole piece and the welding speed determined based on the production parameters of the battery pole piece. The ratio of the welding speed to the welding oscillation frequency is determined as the welding step of the battery pole piece.

[0151] Among them, the welding speed of the battery pole piece is a welding parameter used to measure the welding heat source during the welding process, that is, the speed of the laser beam moving, which can refer to the welding length completed per unit time. The welding speed of the battery pole piece is determined by the production parameters corresponding to the battery pole piece, such as the production cycle. When the production cycle is faster, the corresponding welding speed is faster, and when the production cycle is slower, the corresponding welding speed will also be slower.

[0152] In some of the embodiments, in order to meet the needs of high-speed production rhythm of current battery products, the welding speed during the welding process of the collector plate can be set to ≥250 mm / s, and such a setting can meet the needs of a production rhythm of >150 ppm.

[0153] The welding oscillation frequency refers to the number of times the welding heat source oscillates per unit time during welding, usually expressed in Hertz. The welding oscillation frequency is related to the oscillation period of the welding heat source. The oscillation period refers to the time required for the welding heat source to oscillate from one side to the other side and then return to the original position. The oscillation frequency can be considered as the reciprocal of the oscillation period.

[0154] In some embodiments, the controller can obtain the welding oscillation frequency of the battery electrode and the production parameters of the battery electrode, determine the welding speed based on the production parameters of the battery electrode, and determine the ratio of the welding speed to the welding oscillation frequency as the welding step of the battery electrode.

[0155] In the above embodiment, the welding step of the battery electrode is determined by the welding speed and welding oscillation frequency of the battery electrode, so that the subsequent oscillation amplitude determined based on the welding step can meet any welding speed requirements, that is, the production cycle requirements. Even in the case of high-speed welding, the stability of the welding process can be improved by welding based on the oscillation amplitude determined by the welding step.

[0156] During the welding process, the pore specifications of the end face gap in the end face to be welded also have a high correlation with the welding quality. Therefore, in the process of determining the welding control parameters, the pore specifications of the end face gap can be considered at the same time.

[0157] In some embodiments, Figure 4 As shown, S306, performing swing welding on the battery pole piece and the current collecting plate matching the battery pole piece based on the swing amplitude, including:

[0158] S402, flattening the battery electrode to obtain a flattened electrode end surface.

[0159] In some embodiments, the controller can control the flattening component of the welding system to flatten the battery electrode to obtain a flattened end face of the electrode.

[0160] S404, determining an amplitude correction value of the oscillation amplitude when it is determined that the oscillation amplitude satisfies an amplitude correction condition according to the end surface gap information of the electrode smoothed end surface.

[0161] The end surface gap information is information data used to characterize the specifications of each pore in the flattened end surface of the electrode. For example, the end surface gap information may include the pore diameter and pore position of each pore.

[0162] The amplitude correction condition is a preset judgment condition used to determine whether the swing amplitude needs to be corrected. The amplitude correction condition is related to the specifications of each pore in the electrode flattened end face. For example, the amplitude correction condition is that the pore specifications of each pore meet the preset theoretical pore specifications.

[0163] If the swing amplitude meets the amplitude correction condition, it means that if the current swing amplitude is used for swing welding, the effective contact area of ​​the welding area may be reduced due to excessive pores during the welding process, thereby affecting the welding quality. At this time, the swing amplitude needs to be corrected to improve the subsequent welding quality. If the swing amplitude does not meet the amplitude correction condition, it means that the current swing amplitude can meet the welding requirements and achieve higher welding quality.

[0164] Among them, the amplitude correction value is a specific parameter value used to correct the swing amplitude. The amplitude correction value can be determined based on the end surface gap information, that is, it is determined according to the specifications of each pore in the electrode flattened end surface reflected by the end surface gap information. It can be understood that in order to reduce the impact of the pores on the welding quality, the swing amplitude should be greater than or equal to the pore diameter of the pores as much as possible, so the amplitude correction value is a positive value.

[0165] In some embodiments, the controller can determine whether the swing amplitude meets the amplitude correction condition based on the end surface gap information of the electrode flattened end surface, and determine the amplitude correction value of the swing amplitude based on the end surface gap information if the swing amplitude meets the amplitude correction condition.

[0166] In some embodiments, the end face gap information may include the pore diameters of the pores in the electrode flattened end face. The controller may determine the reference pore diameter with the largest pore diameter based on the pore diameters of the pores, and determine the amplitude difference between the reference swing amplitude and the swing amplitude corresponding to the reference pore diameter as the amplitude correction value of the swing amplitude. The reference swing amplitude is the swing amplitude that can meet the welding requirements of the reference end face gap.

[0167] S406, summing the amplitude correction value and the swing amplitude to obtain a target swing amplitude for performing the welding operation.

[0168] In some embodiments, after obtaining the amplitude correction value, the controller may sum the amplitude correction value and the swing amplitude to obtain a target swing amplitude for performing a welding operation.

[0169] S408, performing swing welding on the flattened end surface of the electrode and the current collecting plate matched with the battery electrode according to the target swing amplitude.

[0170] In some embodiments, the controller can perform oscillation welding on the flattened end surface of the electrode and the current collecting plate matching the battery electrode according to the target oscillation amplitude in combination with other welding control parameters, such as welding speed and welding frequency.

[0171] In the above embodiment, the amplitude of the swing amplitude is corrected by using the end surface pore gap information of the flattened end surface of the electrode, so that the final target swing amplitude can not only meet the welding requirements corresponding to the welding step, but also match the actual pore conditions of the flattened end surface of the electrode. When the target swing amplitude is subsequently used for swing welding, the penetration consistency and welding stability of the collector plate welding process can be effectively improved, thereby improving the safety performance of the cylindrical battery cell.

[0172] In some embodiments, the end surface pore information includes the pore diameter and pore position of each pore in the flattened end surface of the electrode, such as Figure 5 As shown, the welding control method also includes:

[0173] S502, determining the welding quality correlation of each pore according to the position of each pore.

[0174] The pore position is a position parameter used to characterize the position of the pore on the flattened end surface of the electrode. It can be understood that the pore position can be the center position coordinate of the pore or a set of position coordinates used to characterize the pore area.

[0175] Among them, the welding quality correlation is a parameter used to characterize the degree of influence of the pores on the welding quality. The welding quality correlation is related to the pore position. For example, the closer the pore position is to the welding area of ​​the flattened end face of the electrode, the higher the welding quality correlation is, which means that the pore has a higher degree of influence on the welding quality of the subsequent collector plate welding. Conversely, the farther the pore position is from the welding area of ​​the flattened end face of the electrode, the lower the welding quality correlation is, which means that the pore has a lower degree of influence on the welding quality of the subsequent collector plate welding.

[0176] In some embodiments, the controller may determine the welding quality correlation of each pore according to the pore position of each pore in the kneaded end surface of the electrode.

[0177] In some of the embodiments, a correlation calculation model is pre-set in the controller, and the pore position of each pore can be input into the correlation calculation model to obtain the welding quality correlation of each pore.

[0178] S504, for each pore, when the welding quality correlation of the pore is greater than or equal to a preset correlation threshold, determine the pore as a key pore for the electrode flattening end surface.

[0179] Among them, the preset correlation threshold is a preset threshold parameter for judging whether the pore is a critical pore, which can be determined by the production personnel according to the actual welding quality requirements. When the welding quality correlation of the pore is greater than or equal to the preset correlation threshold, it can be considered that the pore has a high degree of influence on the welding quality of the collector plate welding, and the pore is determined as the critical pore of the electrode flattened end face. When the welding quality correlation of the pore is less than the preset correlation threshold, it can be considered that the pore has a low degree of influence on the welding quality of the collector plate welding, and the pore can be determined as a non-critical pore of the electrode flattened end face.

[0180] In some embodiments, for each pore, the controller may compare the welding quality correlation of the pore with a preset correlation threshold, and determine the pore as a key pore for flattening the end face of the electrode when the welding quality correlation of the pore is greater than or equal to the preset correlation threshold.

[0181] S506, comparing the pore diameter of each key pore with the theoretical pore specification corresponding to the oscillation amplitude.

[0182] Among them, the theoretical pore specification is the aperture specification parameter determined by the swing amplitude, that is, under the current swing amplitude, in order to meet the welding quality requirements, the aperture specifications that the pores of the key pores need to meet directly. As mentioned above, the swing amplitude needs to be ≥ the pore diameter to better meet the welding requirements. Therefore, the corresponding theoretical pore specification can be determined according to the swing amplitude. For example, the theoretical pore specification can be a theoretical aperture value, and its value is equal to the amplitude value of the swing amplitude. The theoretical pore specification can also be a theoretical aperture range, for example, the pore diameter is less than the amplitude value corresponding to the swing amplitude.

[0183] In some embodiments, after obtaining the pore diameter of each key pore, the controller can compare each pore diameter with the theoretical pore specification corresponding to the oscillation amplitude.

[0184] S508, when there are abnormal pores with pore diameters larger than theoretical pore specifications in each key pore, determine whether the oscillation amplitude satisfies the amplitude correction condition.

[0185] Among them, abnormal pores are key pores whose pore diameter is larger than the theoretical pore specification. If there are abnormal pores in the electrode flattened end face, it can be considered that swing welding according to the swing amplitude at this time cannot cover the key pores in the electrode flattened end face, which will have a greater impact on the welding quality. Therefore, it is necessary to perform amplitude correction on the swing amplitude. If there are no abnormal pores on the electrode flattened end face, it can be considered that swing welding according to the swing amplitude at this time can cover the key pores in the electrode flattened end face, which will not have a greater impact on the welding quality. The controller can determine that the swing amplitude does not meet the amplitude correction condition and directly perform swing welding according to the swing amplitude.

[0186] In some embodiments, the controller may determine key pores whose pore diameters are larger than theoretical pore specifications as abnormal pores. When it is determined that abnormal pores exist in each key pore, it may be determined that the swing amplitude meets the amplitude correction condition and amplitude correction of the swing amplitude is required.

[0187] In the above embodiment, by calculating the welding quality correlation of each pore, the key pores that have a greater impact on the welding quality are determined from multiple end surface pores, and based on the pore diameters of the key pores, it is determined whether the oscillation amplitude meets the amplitude correction conditions, which can effectively reduce the correction amplitude of the oscillation amplitude and improve the accuracy and correction efficiency of the oscillation amplitude correction.

[0188] In some embodiments, Figure 6 As shown, the amplitude correction value of the swing amplitude is determined, including:

[0189] S602, according to the pore diameters of the abnormal pores, determining the abnormal pore with the largest pore diameter as the corrected reference pore.

[0190] In some embodiments, when there are multiple abnormal pores on the flattened end surface of the battery, the controller can sort the abnormal pores according to their pore diameters and determine the abnormal pore with the largest pore diameter as the corrected reference pore.

[0191] S604, calculating the diameter difference between the pore diameter of the corrected reference pore and the diameter of the theoretical pore specification.

[0192] In some embodiments, the controller may calculate the diameter difference between the pore diameter of the modified reference pore and the theoretical pore size. It is understandable that, since the abnormal pore is a pore with a pore diameter greater than the theoretical pore size, the pore diameter of the modified reference pore is greater than the theoretical pore size, that is, the diameter difference is a positive value.

[0193] S606: When the diameter difference is smaller than the correction threshold, the diameter difference is determined as the amplitude correction value of the swing amplitude.

[0194] The correction threshold is the limit value of the swing amplitude that can be corrected when the swing amplitude is corrected. As mentioned above, although a larger swing amplitude helps to reduce the penetration depth and increase the weld width, an excessively large swing amplitude may also lead to the problem of shallow penetration depth. Therefore, in order to reduce the impact of the swing amplitude on the final welding quality due to the unlimited increase of the swing amplitude, a corresponding correction threshold can be set for the swing amplitude.

[0195] In some of the embodiments, the correction threshold of the swing amplitude can be directly set by production personnel according to actual welding conditions.

[0196] In some of the embodiments, the production personnel may set a corresponding amplitude range for the swing amplitude, and the controller may determine a correction threshold value corresponding to the current swing amplitude based on the amplitude range and the current swing amplitude.

[0197] In some embodiments, the controller may compare the calculated diameter difference with a correction threshold. When the diameter difference is smaller than the correction threshold, it indicates that the diameter difference may be directly used to correct the swing amplitude, and thus the diameter difference is determined as the correction value of the swing amplitude.

[0198] S608: When the diameter difference is greater than or equal to the correction threshold, the correction threshold is determined as the amplitude correction value of the swing amplitude.

[0199] In some embodiments, when the diameter difference is greater than or equal to the correction threshold, the controller may determine the correction threshold as the amplitude correction value of the swing amplitude. While reducing the risk of excessive swing amplitude, the influence of abnormal porosity on welding quality can also be reduced.

[0200] In the above embodiment, by setting the correction threshold of the swing amplitude, the risk of excessive correction of the swing amplitude can be effectively reduced, thereby improving the welding quality of the collector plate.

[0201] In some embodiments, Figure 7 As shown, S402, flattening the battery electrode to obtain a flattened electrode end surface, including:

[0202] S702, determining the theoretical pore size of the flattened end surface of the battery electrode based on the swing amplitude.

[0203] In some embodiments, the controller may determine the theoretical pore size of the flattened end surface of the battery electrode based on the swing amplitude. It is understandable that the theoretical pore size may be a pore diameter smaller than the amplitude value of the swing amplitude.

[0204] S704, determining the flattening control parameters of the battery electrode according to the theoretical pore specifications.

[0205] In some embodiments, after obtaining the theoretical pore size, the controller can determine the flattening control parameters of the battery electrode according to the theoretical pore size. The flattening control parameters are parameter information used to control the flattening component, and the flattening control parameters may include but are not limited to the feed amount, feed speed, rotation speed, etc. of the flattening roller.

[0206] S706, performing flattening processing on the battery electrode according to the flattening control parameters to obtain a flattened electrode end surface.

[0207] In some embodiments, after obtaining the flattening control parameters, the controller can control the operation of the flattening component according to the flattening control parameters to flatten the battery electrode sheet to obtain a flattened electrode end face.

[0208] In the above embodiment, by reversely determining the flattening parameters according to the oscillation amplitude determined by the welding step, the regularity of the flattened end surface of the electrode obtained by the flattening process can be more closely matched with the oscillation amplitude, thereby reducing the probability of abnormal pores on the flattened end surface of the electrode and improving the welding quality.

[0209] The above embodiment specifically describes how to determine the target swing amplitude and how to obtain high-quality electrode flattened end face operation steps. When welding the electrode flattened end face to the collector plate, due to the influence of the cleanliness of the welding environment and the inevitable movement operation during the welding process, it is easy to cause the electrode flattened end face to absorb or be contaminated with impurities. If the electrode flattened end face with impurities is directly welded, the welding quality of the collector plate welding will be greatly reduced, and the welding slag defect rate of the battery collector plate welding will be increased. Therefore, improving the cleanliness of the object to be welded is also an effective way to reduce the welding slag defect rate of the battery collector plate welding.

[0210] In some embodiments, Figure 8 As shown, the welding control method also includes the following steps:

[0211] S802, obtaining a kneaded end surface image of the kneaded end surface of the electrode.

[0212] In some embodiments, the controller can obtain a flattened end surface image of the flattened end surface of the electrode. For example, the controller can obtain a flattened end surface image captured and uploaded by an image acquisition device from a production management system based on the electrode surface identification of the battery electrode surface. For another example, the controller can be connected to the image acquisition device for communication and directly obtain the flattened end surface image captured by the image acquisition device.

[0213] S804, based on the flattened end surface image, performing end surface contaminant detection on the flattened end surface of the electrode to obtain contamination information of the flattened end surface.

[0214] Among them, the end face contamination detection is a detection operation for detecting whether there are contaminants on the end face. By performing the end face contamination detection on the electrode flattened end face, the flattened end face contamination information can be obtained. The flattened end face contamination information may include the contamination position, contamination degree, contamination type, etc. of the electrode flattened end face.

[0215] In some embodiments, a contaminant detection model is pre-set in the controller. After obtaining the flattened end face image, the controller can call the contaminant detection model to perform end face contaminant detection on the flattened end face of the electrode based on the flattened end face image to obtain the flattened end face contamination information output by the contaminant detection model.

[0216] S806, determining cyclone dust removal parameters for the flattened end surface of the electrode before welding according to the dirt information of the flattened end surface.

[0217] The cyclone dust removal parameters are control parameters used to control the operation of the cyclone dust removal component. The cyclone dust removal parameters may include but are not limited to cyclone dust removal pressure, dust removal power, etc.

[0218] In some embodiments, the controller can determine the cyclone dust removal parameters of the flattened end surface of the electrode before welding based on the dirt information of the flattened end surface.

[0219] S808, performing cyclone dust removal on the flattened end surface of the electrode according to cyclone dust removal parameters.

[0220] In some embodiments, the controller can control the operation of the cyclone dust removal component according to the cyclone dust removal parameters to perform cyclone dust removal on the flattened end surface of the electrode.

[0221] In the above embodiment, the flattened end face of the electrode is detected for end face contaminants by using the flattened end face image, so that the flattened end face contamination information of the electrode can be quickly obtained, and the cyclone dust removal parameters can be determined based on the flattened end face contamination information, so that the cyclone dust removal parameters can be matched with the actual contamination situation of the flattened end face, thereby improving the cyclone dust removal efficiency and reducing the energy consumption of the cyclone dust removal.

[0222] Further, in some embodiments, the cyclone dust collection parameters include cyclone dust collection pressure, such as Fig. 9 As shown, S806, determining the cyclone dust removal parameters of the electrode flattened end surface before welding according to the flattened end surface dirt information, including:

[0223] S902, obtaining the electrode piece welding failure information within a preset production cycle, the first gas pressure related weight corresponding to the electrode piece welding failure information, and the second gas pressure related weight corresponding to the flattened end surface contamination information.

[0224] Among them, the electrode welding failure information can represent the number of electrodes with unqualified welding within a preset production cycle. For example, the electrode welding failure information can be the electrode welding slag failure rate. The preset production cycle is the information reference cycle pre-set by the production personnel when counting the electrode welding failure information. By setting the preset production cycle, the amount of reference information can be reduced and the determination rate of the cyclone dust removal parameters can be increased.

[0225] The first air pressure related weight is a weight coefficient used to characterize the relative importance of the poor electrode welding information in the process of determining the cyclone dust removal pressure. The larger the first air pressure related weight, the higher the relative importance of the corresponding poor electrode welding information in the process of determining the cyclone dust removal pressure. Conversely, the smaller the first air pressure related weight, the lower the relative importance of the corresponding poor electrode welding information in the process of determining the cyclone dust removal pressure.

[0226] The second air pressure related weight is a weight coefficient used to characterize the relative importance of the flattened end surface dirt information in determining the cyclone dust removal pressure. Similarly, the larger the second air pressure related weight, the higher the relative importance of the corresponding flattened end surface dirt information in determining the cyclone dust removal pressure. Conversely, the smaller the second air pressure related weight, the lower the relative importance of the corresponding flattened end surface dirt information in determining the cyclone dust removal pressure.

[0227] In some embodiments, the controller can obtain information about poor electrode welding within a preset production cycle, a first air pressure-related weight corresponding to the poor electrode welding information, and a second air pressure-related weight corresponding to information about dirt on the flattened end surface.

[0228] In some of the embodiments, the first air pressure-related weight and the second air pressure-related weight are both fixed weight values, which are predetermined by production personnel according to actual production conditions and stored in the controller.

[0229] In some of the embodiments, the first air pressure related weight and the second air pressure related weight are non-fixed weight values, which can be determined in real time according to the actual production situation. For example, the first air pressure related weight and the second air pressure related weight can be related to the production time. For example, at the beginning of production, the welding environment is relatively clean. At this time, the cyclone dust removal air pressure can be determined based on the dirt information of the flattened end face. Therefore, the second air pressure related weight at this time will be greater than the first air pressure related weight. In the later stage of production, due to long-term welding, the welding environment will be more or less polluted. At this time, the cyclone dust removal air pressure can be assisted in determining based on the poor electrode welding information within the preset production cycle. At this time, the first air pressure related weight will be greater than the second air pressure related weight.

[0230] S904, determining a first dust removal air pressure that matches the electrode piece welding failure information and a second dust removal air pressure that matches the flattened end face dirt information.

[0231] In some embodiments, the controller can determine a first dust removal pressure that matches the poor electrode welding information, and a second dust removal pressure that matches the flattened end face dirt information. For example, a first air pressure calculation function that determines the first dust removal pressure according to the poor electrode welding information, and a second air pressure calculation function that determines the second dust removal pressure according to the flattened end face dirt information can be pre-set in the controller, and the first dust removal pressure that matches the poor electrode welding information is determined according to the first air pressure calculation function, and the second dust removal pressure that matches the flattened end face dirt information is determined according to the second air pressure calculation function. For another example, the controller pre-stores a first correspondence between each poor electrode welding information and each first dust removal pressure, and a second correspondence between each flattened end face dirt information and each second dust removal pressure. The controller can search the first correspondence to determine the first dust removal pressure that matches the poor electrode welding information, and search the second correspondence to determine the second dust removal pressure that matches the flattened end face dirt information.

[0232] S906, determining the cyclone dust removal pressure of the electrode flattened end surface before welding according to the first dust removal pressure, the first pressure-related weight, the second dust removal pressure and the second pressure-related weight.

[0233] In some embodiments, the controller may add the product of the first dust removal pressure and the first pressure-related weight and the product of the second dust removal pressure and the second pressure-related weight to determine the cyclone dust removal pressure of the electrode flattened end face before welding.

[0234] In the above embodiment, when determining the cyclone dust removal parameters, the relative importance of the flattened end face dirt information and the poor electrode welding information to the determination of the cyclone dust removal air pressure is taken into consideration, which can effectively improve the matching of the final determined cyclone dust removal air pressure with the battery electrode welding conditions, thereby improving the accuracy of the final determined cyclone dust removal air pressure.

[0235] In addition to cyclone dust removal on the flattened end surface of the electrode before welding, the dust removal operation after welding can also effectively reduce the welding slag defect rate of the battery electrode collector plate welding.

[0236] In some embodiments, Fig.10 As shown, the welding control method also includes the following steps:

[0237] S1002, obtaining an end surface image of the electrode current collector disk after welding.

[0238] In some embodiments, the controller can obtain an image of the collector plate end face of the electrode collector plate obtained after welding is completed. For example, the controller can obtain an image of the collector plate end face collected and uploaded by an image acquisition device from a production management system based on the electrode face identification of the battery electrode face. For another example, the controller can be connected to the image acquisition device for communication and directly obtain an image of the collector plate end face collected by the image acquisition device.

[0239] S1004, performing end surface contaminant detection on the end surface of the electrode current collecting disk according to the end surface image of the current collecting disk, and obtaining contamination information of the end surface of the current collecting disk.

[0240] The contamination information of the collector plate end surface is information data used to characterize the contamination condition of the electrode collector plate end surface, and may include the contamination position, contamination degree, contamination type, etc. of the electrode collector plate end surface.

[0241] In some embodiments, a contaminant detection model is pre-set in the controller. After obtaining the end face image of the collecting disk, the controller can call the contaminant detection model to perform end face contaminant detection on the flattened end face of the electrode based on the end face image of the collecting disk, and obtain the contamination information of the end face of the collecting disk output by the contaminant detection model.

[0242] S1006, determining brush dust removal parameters for the end surface of the electrode current collecting plate based on the contamination information of the end surface of the current collecting plate.

[0243] The brush dust removal parameters are control parameters used to control the operation of the brush dust removal component. The brush dust removal parameters may include but are not limited to the lifting range and rotation speed of the brush.

[0244] In some embodiments, the controller may determine brush dust removal parameters for the end surface of the electrode current collecting plate after welding based on the contamination information of the end surface of the current collecting plate.

[0245] In some embodiments, the dirtiness information of the end surface of the collecting plate may include the degree of dirtiness of the end surface of the collecting plate, and the controller may determine the descending depth of the brush and the rotation speed of the brush according to the degree of dirtiness.

[0246] S1008, performing brush dust removal processing on the end surface of the electrode current collecting plate according to brush dust removal parameters.

[0247] In some embodiments, the controller can control the operation of the brush dust removal assembly according to the brush dust removal parameters to perform brush dust removal on the end surface of the electrode current collecting plate.

[0248] In the above embodiment, the end face contaminants of the electrode collector plate are detected by using the end face image of the collector plate, so that the contamination information of the collector plate end face of the electrode flattened end face can be quickly obtained, and the brush dust removal parameters are determined according to the contamination information of the collector plate end face. The brush dust removal parameters can be matched with the actual contamination situation of the collector plate end face, thereby improving the dust removal efficiency of the brush and reducing the energy consumption of the dust removal by the brush.

[0249] In some embodiments, a welding control method is provided, wherein the welding control method is applied to Figure 2The welding system shown in the figure is used to weld the collector plate of the cathode of a cylindrical battery as an example. The welding control method can be divided into a preparation stage, an actual welding stage and a post-welding detection stage.

[0250] like Fig.11 As shown, the preparation phase specifically includes the following steps:

[0251] S1101, in response to a welding instruction for a cylindrical battery electrode sheet, obtaining a welding oscillation frequency of a battery cell cathode of the cylindrical battery and a welding speed determined based on production parameters of the battery cell cathode.

[0252] It is understandable that in order to meet the needs of high-speed production (>150ppm), the welding speed of the collector plate is generally ≥250mm / s.

[0253] S1102, determining the ratio of the welding speed to the welding oscillation frequency as the welding step of the cathode of the battery cell.

[0254] When setting the swing amplitude, the welding speed and the welding swing frequency also need to be matched. The relationship between the welding step and the welding speed and the welding swing frequency is: welding step = welding speed / swing frequency. The schematic diagram of the swing amplitude and welding step is as follows: Fig.12 As shown, V is the welding speed, f is the oscillation frequency, and A is the oscillation amplitude.

[0255] S1103, based on the swing amplitude, determine the theoretical pore size of the flattened end surface of the battery electrode.

[0256] S1104, determining the flattening control parameters of the battery electrode according to the theoretical pore specifications.

[0257] S1105, performing a flattening process on the anode and cathode of the cylindrical battery according to the flattening control parameters to obtain a flattened end surface of the anode and a flattened end surface of the cathode.

[0258] The controller can flatten the anode and cathode of the cylindrical battery according to the flattening control parameters, and after flattening the cathode and anode tabs of the battery, expose the compact flattened cathode and anode end faces. In some embodiments, the height of the flattened battery cell should be controlled to 90±1.5mm, the flatness of the flattened cathode and anode end faces should be controlled to ±0.5mm, and the maximum end face gap should be controlled to ≤0.4mm.

[0259] S1106, complete the welding of the anode collector plate and control the flipping machine to flip the end face of the battery cell.

[0260] Among them, since the anode collector plate welding is completed first, the anode collector plate welding does not need to flip the end face of the battery cell, and the possibility of contamination of the flattened end face of the anode is low. Therefore, in order to reduce welding costs, the anode collector plate welding can use traditional welding methods.

[0261] S1107, obtaining a kneaded end surface image of the cathode kneaded end surface.

[0262] S1108, based on the flattened end surface image, performing end surface contaminant detection on the cathode flattened end surface to obtain contamination information of the flattened end surface.

[0263] S1109, obtaining the electrode piece welding failure information within a preset production cycle, the first gas pressure related weight corresponding to the electrode piece welding failure information, and the second gas pressure related weight corresponding to the flattened end surface contamination information.

[0264] S1110, determining a first dust removal air pressure that matches the poor electrode welding information and a second dust removal air pressure that matches the dirt information of the flattened end surface.

[0265] S1111, determining the cyclone dust removal pressure of the electrode flattened end surface before welding according to the first dust removal pressure, the first pressure-related weight, the second dust removal pressure and the second pressure-related weight.

[0266] Among them, the necessity of the cyclone dust removal assembly to perform cyclone dust removal on the flattened end face of the cathode is that the battery cell holder has a center opening. Before the battery cell is flipped over, the flattened end face of the cathode contacts the bottom of the holder. Impurity particles on the logistics belt will contaminate the flattened end face of the cathode through the center hole, which will increase the risk of welding spatter and the defective rate of welding slag.

[0267] It can be understood that the cyclone dust removal pressure can be adjusted in real time according to the dirtiness of the cathode flattened end surface and the welding slag loss. In some embodiments, the cyclone dust removal pressure needs to be greater than 0.14Mpa.

[0268] S1112, according to the cyclone dust removal parameters, controlling the cyclone dust removal component to perform cyclone dust removal on the cathode flattened end surface.

[0269] like Fig.13 As shown, the actual cathode welding stage specifically includes the following steps:

[0270] S1301, obtaining the electrode information of the battery cell cathode.

[0271] S1302, determining the oscillation amplitude of the cathode of the battery cell according to the amplitude gain coefficient and the welding step that match the electrode information.

[0272] S1303, determining the welding quality correlation of each pore according to the pore position of each pore in the cathode kneaded end surface.

[0273] S1304, for each pore, when the welding quality correlation of the pore is greater than or equal to a preset correlation threshold, determine the pore as a key pore for the electrode flattening end face.

[0274] S1305, comparing the pore diameter of each key pore with the theoretical pore specification corresponding to the oscillation amplitude.

[0275] S1306, determine whether there are abnormal pores in each key pore, if not, execute S1307, if yes, execute S1308.

[0276] Among them, key pores with pore diameters larger than theoretical pore specifications are identified as abnormal pores.

[0277] S1307, according to the swing amplitude, control the welding assembly to swing weld the flattened end surface of the electrode and the current collecting plate matched with the battery electrode.

[0278] S1308, according to the pore diameters of the abnormal pores, determine the abnormal pore with the largest pore diameter as the corrected reference pore.

[0279] S1309, calculating the diameter difference between the pore diameter of the corrected reference pore and the diameter of the theoretical pore specification.

[0280] S1310, determine whether the diameter difference is less than the correction threshold. If so, execute S1311; if not, execute S1312.

[0281] S1311, determine the diameter difference as the amplitude correction value of the swing amplitude.

[0282] S1312: Determine the correction threshold as the amplitude correction value of the swing amplitude.

[0283] S1313, summing the amplitude correction value and the swing amplitude to obtain a target swing amplitude for performing the welding operation.

[0284] S1314, according to the target swing amplitude, control the welding assembly to perform swing welding on the flattened end surface of the electrode and the current collecting plate matching the battery electrode.

[0285] like Fig.14 As shown in the figure, the post-welding inspection stage specifically includes the following steps:

[0286] S1401, obtaining an end surface image of the cathode current collecting disk after welding.

[0287] S1402: Perform end surface contaminant detection on the cathode current collecting disk end surface according to the current collecting disk end surface image to obtain contamination information of the current collecting disk end surface.

[0288] S1403: Determine brush dust removal parameters for the cathode current collecting plate end surface based on the contamination information of the current collecting plate end surface.

[0289] S1404, performing brush dust removal processing on the end surface of the cathode current collecting plate according to the brush dust removal parameters.

[0290] S1405, performing weld appearance inspection on the cathode collector plate end surface obtained after brush dust removal.

[0291] S1406, determine whether the test result is qualified, if so, execute S1407, if not, execute S1408.

[0292] S1407, transport the cathode current collecting plate end surface to the next process.

[0293] Among them, the next process is X-ray inspection.

[0294] S1408, transport the cathode current collecting plate end surface to the unqualified material processing area.

[0295] If the test result is unqualified (NG), the cathode collector disc end face is determined to be a defective end face, and the cathode collector disc end face is transported to a defective material processing area for defective product processing.

[0296] The welding control method in the above embodiment adopts a single-mode ring swing welding method to improve the compatibility of welding with the porous structure of the flattened end face, reduce the flow rate and temperature gradient of the molten pool, improve the uniformity of energy distribution, and further improve the compatibility with the molten pool fluctuation caused by impurities, thereby improving welding stability, reducing the occurrence of pinhole explosion points, and reducing the welding slag defect rate. At the same time, the cleanliness of the cathode flattened end face and the cathode current collecting plate is improved from the generation end and the outflow end, and the welding quality is improved to the greatest extent in a collaborative way.

[0297] In some embodiments, the qualified swing trajectory obtained by the above welding control method is as follows: Fig.15 As shown in the figure, the metallographic morphology after swing welding is different from that of conventional welding. Fig.16 As shown in the figure, the two are obviously different. The effective weld width of swing welding is ≥0.4mm, and its welding trajectory is a staggered distribution of long and short welding lines, such as Fig.17 shown.

[0298] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0299] Based on the same inventive concept, the embodiment of the present application also provides a welding control device for implementing the welding control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more welding control device embodiments provided below can refer to the limitations on the welding control method above, and will not be repeated here.

[0300] In some embodiments, Fig.18 As shown, a welding control device 1800 is provided, comprising: a command response module 1801, an amplitude determination module 1802 and a welding control module 1803, wherein:

[0301] The instruction response module 1801 is used to respond to the welding instruction for the battery electrode and obtain the welding step and electrode information of the battery electrode.

[0302] The amplitude determination module 1802 is used to determine the swing amplitude of the battery pole piece according to the amplitude gain coefficient matched with the pole piece information and the welding step.

[0303] The welding control module 1803 is used to perform swing welding on the battery pole piece and the current collecting plate matched with the battery pole piece based on the swing amplitude.

[0304] In some embodiments, the welding control device 1800 further includes:

[0305] The basic welding parameter acquisition module is used to obtain the welding oscillation frequency of the battery pole piece and the welding speed determined based on the production parameters of the battery pole piece.

[0306] The welding step determination module is used to determine the ratio of the welding speed to the welding oscillation frequency as the welding step of the battery electrode.

[0307] In some embodiments, the welding control module 1803 is used to: flatten the battery electrode to obtain a flattened end face of the electrode; determine the amplitude correction value of the swing amplitude when it is determined that the swing amplitude meets the amplitude correction condition based on the end face gap information of the flattened end face of the electrode; sum the amplitude correction value and the swing amplitude to obtain the target swing amplitude for performing the welding operation; and perform swing welding on the flattened end face of the electrode and the current collecting plate matching the battery electrode according to the target swing amplitude.

[0308] In some embodiments, the end surface pore information includes the pore diameter and pore position of each pore in the electrode flattened end surface. The welding control device 1800 also includes:

[0309] The welding quality correlation determination module is used to determine the welding quality correlation of each pore according to the position of each pore.

[0310] The key pore determination module is used to determine, for each pore, the pore as a key pore of the electrode flattened end face when the welding quality correlation of the pore is greater than or equal to a preset correlation threshold.

[0311] The comparison module is used to compare the pore diameter of each key pore with the theoretical pore specification corresponding to the swing amplitude.

[0312] The condition judgment module is used to determine whether the swing amplitude meets the amplitude correction condition when there are abnormal pores with pore diameters larger than the theoretical pore specifications in each key pore.

[0313] In some embodiments, the welding control module 1803 is used to: determine the abnormal pore with the largest pore diameter as the corrected reference pore based on the pore diameter of each abnormal pore; calculate the diameter difference between the pore diameter of the corrected reference pore and the theoretical pore specification; when the diameter difference is less than a correction threshold, determine the diameter difference as the amplitude correction value of the swing amplitude; when the diameter difference is greater than or equal to the correction threshold, determine the correction threshold as the amplitude correction value of the swing amplitude.

[0314] In some embodiments, the welding control module 1803 is used to: determine the theoretical pore specifications of the flattened end face of the battery electrode based on the swing amplitude; determine the flattening control parameters of the battery electrode according to the theoretical pore specifications; and flatten the battery electrode according to the flattening control parameters to obtain the flattened end face of the electrode.

[0315] In some embodiments, the welding control device 1800 further includes:

[0316] The flattened end surface image acquisition module is used to acquire the flattened end surface image of the flattened end surface of the electrode.

[0317] The end face contaminant detection module is used to detect end face contaminants on the flattened end face of the electrode based on the flattened end face image to obtain contamination information of the flattened end face.

[0318] The cyclone dust removal parameter determination module is used to determine the cyclone dust removal parameters of the electrode flattened end surface before welding according to the dirt information of the flattened end surface.

[0319] The cyclone dust removal processing module is used to perform cyclone dust removal on the flattened end surface of the electrode according to the cyclone dust removal parameters.

[0320] In some embodiments, the cyclone dust removal parameters include cyclone dust removal air pressure. The cyclone dust removal parameter determination module is used to: obtain the poor electrode welding information within a preset production cycle, the first air pressure-related weight corresponding to the poor electrode welding information, and the second air pressure-related weight corresponding to the flattened end face dirt information; determine the first dust removal air pressure that matches the poor electrode welding information, and the second dust removal air pressure that matches the flattened end face dirt information; determine the cyclone dust removal air pressure of the electrode flattened end face before welding based on the first dust removal air pressure, the first air pressure-related weight, the second dust removal air pressure, and the second air pressure-related weight.

[0321] In some embodiments, the welding control device 1800 further includes:

[0322] The collector plate end face image acquisition module is used to acquire the collector plate end face image of the electrode collector plate end face obtained after welding is completed.

[0323] The end surface contaminant detection module is used to detect end surface contaminants on the end surface of the electrode current collecting disk according to the end surface image of the current collecting disk, and obtain contamination information on the end surface of the current collecting disk.

[0324] The brush dust removal parameter determination module is used to determine the brush dust removal parameters of the electrode collector plate end surface based on the dirt information of the collector plate end surface.

[0325] The brush dust removal processing module is used to perform brush dust removal processing on the end surface of the electrode collector plate according to the brush dust removal parameters.

[0326] Each module in the welding control device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in an electronic device in the form of hardware, or can be stored in a memory in the electronic device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0327] In some embodiments, an electronic device is provided. The electronic device may be a controller, and its internal structure diagram may be as follows: Fig.19As shown. The electronic device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic device is used to store data such as welding steps, pole piece information data, amplitude gain coefficients, and swing amplitudes. The network interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a welding control method is implemented.

[0328] Those skilled in the art will understand that Fig.19 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0329] In some embodiments, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the specific steps of the above-mentioned welding control method embodiment when executing the computer program.

[0330] In some embodiments, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the specific steps of the above-mentioned welding control method embodiment are implemented.

[0331] In some embodiments, a computer program product is provided, including a computer program, which implements the specific steps of the above-mentioned welding control method embodiment when executed by a processor.

[0332] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. In addition, the acquisition, storage, processing, and transmission of data are in compliance with relevant laws and regulations.

[0333] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0334] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0335] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A welding control method, characterized in that: The method comprises: In response to a welding instruction for a battery electrode sheet, obtaining welding steps and electrode sheet information of the battery electrode sheet; Determining the swing amplitude of the battery electrode according to the amplitude gain coefficient matched with the electrode information and the welding step; The battery pole piece and the current collecting plate matched with the battery pole piece are oscillated and welded based on the oscillation amplitude.

2. The method according to claim 1, characterized in that The method further comprises: Obtaining a welding oscillation frequency of the battery electrode sheet and a welding speed determined based on production parameters of the battery electrode sheet; The ratio of the welding speed to the welding oscillation frequency is determined as the welding step of the battery electrode.

3. The method according to claim 1, characterized in that The swing welding of the battery pole piece and the current collecting plate matched with the battery pole piece based on the swing amplitude comprises: Flattening the battery electrode to obtain a flattened electrode end surface; When it is determined that the oscillation amplitude satisfies an amplitude correction condition according to the end surface gap information of the flattened end surface of the electrode, an amplitude correction value of the oscillation amplitude is determined; summing the amplitude correction value and the swing amplitude to obtain a target swing amplitude for performing a welding operation; According to the target swing amplitude, the flattened end surface of the electrode and the current collecting plate matched with the battery electrode are oscillated and welded.

4. The method according to claim 3, characterized in that The end surface pore information includes the pore diameter and pore position of each pore in the flattened end surface of the electrode; the method further includes: Determining the welding quality correlation of each of the pores according to the position of each of the pores; For each of the pores, when the welding quality correlation of the pore is greater than or equal to a preset correlation threshold, the pore is determined as a key pore of the electrode flattened end surface; Comparing the pore diameter of each of the key pores with the theoretical pore specifications corresponding to the oscillation amplitude; In the case that abnormal pores having pore diameters larger than the theoretical pore size exist in each of the key pores, it is determined that the oscillation amplitude satisfies the amplitude correction condition.

5. The method according to claim 4, characterized in that The step of determining the amplitude correction value of the swing amplitude comprises: According to the pore diameters of the abnormal pores, the abnormal pore with the largest pore diameter is determined as the corrected reference pore; Calculating the diameter difference between the pore diameter of the modified reference pore and the diameter of the theoretical pore specification; When the diameter difference is less than a correction threshold, determining the diameter difference as an amplitude correction value of the swing amplitude; When the diameter difference is greater than or equal to the correction threshold, the correction threshold is determined as an amplitude correction value of the swing amplitude.

6. The method according to any one of claims 3 to 5, characterized in that: The step of flattening the battery electrode sheet to obtain a flattened electrode end surface comprises: Based on the oscillation amplitude, determining the theoretical pore size of the flattened end surface of the battery electrode; Determining the flattening control parameters of the battery electrode sheet according to the theoretical pore specifications; The battery electrode is flattened according to the flattening control parameters to obtain a flattened electrode end face.

7. The method according to claim 6, characterized in that The method further comprises: Acquiring a kneaded end surface image of the kneaded end surface of the electrode; Based on the flattened end surface image, end surface contaminant detection is performed on the flattened end surface of the electrode to obtain contamination information of the flattened end surface; Determining cyclone dust removal parameters of the electrode flattened end surface before welding according to the flattened end surface dirt information; The flattened end surface of the electrode is subjected to cyclone dust removal according to the cyclone dust removal parameters.

8. The method according to claim 7, characterized in that The cyclone dust removal parameters include cyclone dust removal air pressure; the cyclone dust removal parameters of the electrode flattened end surface before welding are determined according to the flattened end surface dirt information, including: Acquire the electrode piece welding failure information within a preset production cycle, the first air pressure related weight corresponding to the electrode piece welding failure information, and the second air pressure related weight corresponding to the flattened end surface contamination information; Determine a first dust removal air pressure that matches the electrode piece welding failure information and a second dust removal air pressure that matches the flattened end surface dirt information; The cyclone dust removal pressure of the electrode flattened end surface before welding is determined according to the first dust removal pressure, the first pressure-related weight, the second dust removal pressure, and the second pressure-related weight.

9. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Acquire an end surface image of the electrode collector disk after welding; According to the collector plate end surface image, end surface contaminant detection is performed on the end surface of the electrode collector plate to obtain contamination information of the collector plate end surface; Determining brush dust removal parameters of the end surface of the electrode current collector disk based on the dirt information of the end surface of the current collector disk; The end surface of the electrode current collecting plate is subjected to brush dust removal treatment according to the brush dust removal parameters.

10. A welding control device, characterized in that: The device comprises: An instruction response module, used for obtaining welding steps and electrode information of the battery electrode in response to a welding instruction for the battery electrode; An amplitude determination module, used to determine the swing amplitude of the battery pole piece according to the amplitude gain coefficient matched with the pole piece information and the welding step; A welding control module is used to perform swing welding on the battery pole piece and a current collecting plate matched with the battery pole piece based on the swing amplitude.

11. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

13. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

14. A welding system, characterized in that: The welding system includes a welding assembly and a controller in communication with the welding assembly; The welding assembly is used to perform a swing welding operation on a battery electrode piece and a current collecting plate matched with the battery electrode piece; The controller is used to implement the steps of the method according to any one of claims 1 to 8.

15. The welding system according to claim 14, characterized in that The welding system also includes a flattening component that is communicatively connected to the controller; The flattening assembly is used to flatten the battery electrode to obtain a flattened electrode end surface; The controller determines theoretical pore specification information of the flattened end face of the battery electrode based on the swing amplitude of the welding assembly, determines flattening control parameters of the battery surface according to the theoretical pore specification information, and controls the flattening assembly to flatten the battery electrode according to the flattening control parameters to obtain a flattened end face of the electrode.

16. The welding system according to claim 15, characterized in that The welding system also includes a cyclone dust removal component communicatively connected to the controller; The cyclone dust removal component is used to perform cyclone dust removal on the flattened end surface of the electrode; The controller obtains a flattened end face image of the flattened end face of the electrode; based on the flattened end face image, performs end face contaminant detection on the flattened end face of the electrode to obtain contamination information of the flattened end face; determines cyclone dust removal parameters of the flattened end face of the electrode before welding according to the contamination information of the flattened end face; and controls the cyclone dust removal component to perform cyclone dust removal on the flattened end face of the electrode according to the cyclone dust removal parameters.

17. The welding system according to claim 16, characterized in that The welding system also includes a brush dust removal assembly communicatively connected to the controller; The brush dust removal assembly is used to perform brush dust removal on the end surface of the electrode collector plate obtained after the battery electrode piece is welded; The controller obtains an end face image of the electrode collector disk; performs end face contaminant detection on the end face of the electrode collector disk based on the end face image to obtain a degree of contamination on the end face of the collector disk; determines brush dust removal parameters for the end face of the electrode collector disk based on the degree of contamination on the end face of the collector disk; and controls the brush dust removal component to perform brush dust removal on the end face of the electrode collector disk according to the brush dust removal parameters.

18. The welding system according to any one of claims 14 to 17, characterized in that: The welding assembly includes a single-mode annular spot continuous fiber laser.

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