Method, device, equipment and storage medium for preparing battery pole piece

Abstract

The application relates to the technical field of battery processing, and discloses a preparation method, device and equipment of a battery pole piece and a storage medium. The method comprises the following steps: after a laser is emitted by a laser emitter, the splitting mode of a beam splitter is determined based on a processing drawing of the battery pole piece, the laser is subjected to splitting and splitting processing according to the splitting mode, the transmission path of the laser after the splitting and splitting processing is adjusted through a galvanometer, the laser is controlled to generate a conductive structure on the battery pole piece, and a target pole piece is obtained. Through improvement on the light emission frequency of the laser emitter, the splitting mode of the beam splitter, the splicing and vibration frequency of the galvanometer, the electrode material is kept in a plane, the laser is attached to the vertical running direction, the depth-diameter ratio in the punching process is increased, the processing efficiency of the galvanometer during pole piece preparation is improved, and the thermal influence in the battery pole piece preparation process is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery processing, and in particular to a battery pole piece preparation method, device, equipment and storage medium. BACKGROUND

[0002] Generating a conductive structure on the battery pole piece coating area by using a laser can increase the porosity of the battery pole piece, thereby improving the effective conductivity of lithium ions. In the prior art, when the laser performs surface treatment, the width of the pole piece or foil is relatively wide. At this time, when the laser treatment range is relatively large, problems such as alignment deviation, spot distortion and limited range size may occur. When punching is performed, using a larger range of field mirror configuration may cause the spot to become larger and the punching effect to become worse. When scribing is performed, due to the fast tape running speed, the pole piece scribing may deviate obliquely. In addition, in the process of using a laser to perform pole piece surface treatment to achieve pole piece preparation, the galvanometer speed may limit the laser surface treatment efficiency. SUMMARY

[0003] The main purpose of the present application is to solve the technical problems of slow efficiency, large heat influence and easy to cause wrinkles or bulges in the existing battery pole piece preparation process.

[0004] The first aspect of the present application provides a battery pole piece preparation method applied to a battery pole piece processing device, wherein the battery pole piece processing device comprises a laser, a beam splitter and a galvanometer. The method comprises the following steps: after the laser emits laser, determining a beam splitting mode of the beam splitter based on a processing drawing of the battery pole piece, and performing beam splitting treatment on the laser according to the beam splitting mode; adjusting a transmission path of the laser after the beam splitting treatment by using the galvanometer, and controlling the laser to generate a conductive structure on the battery pole piece based on the transmission path to obtain a target pole piece.

[0005] Optionally, in the first implementation manner of the first aspect of the present application, the method further comprises the following steps: determining a type of the conductive structure based on the processing drawing of the battery pole piece, determining a frequency range of the laser based on the type, reducing a center frequency of the frequency range to obtain a target frequency of the laser, and controlling the laser to emit laser at the target frequency.

[0006] Optionally, in the second implementation manner of the first aspect of the present application, before the step of adjusting the transmission path of the laser after the beam splitting treatment by using the galvanometer, the method further comprises the following steps: judging whether the battery pole piece is a large-range battery pole piece according to a pole piece size of the battery pole piece; if yes, splicing each galvanometer, and performing normalization processing on the spliced galvanometers to obtain an integrated galvanometer.

[0007] Optionally, in a third implementation form of the first aspect of the present application, the splicing the mirrors and the normalization processing of the spliced mirrors comprises: correcting the horizontal state of each mirror based on a processing platform in the battery tab processing device, and determining a reference mirror; taking the reference mirror as a standard, correcting the horizontal state of each mirror adjacent to the reference mirror, and correcting the horizontal state of the remaining mirrors in turn; obtaining a sub-coordinate system corresponding to each mirror, and determining the positional relationship of each sub-coordinate system based on the relative positions of the mirrors; taking the sub-coordinate system corresponding to the reference mirror as a reference coordinate system, and performing normalization processing on the spliced mirrors based on the reference coordinate system and the positional relationship, to obtain an integrated mirror.

[0008] Optionally, in a fourth implementation form of the first aspect of the present application, the adjusting the transmission path of the laser processed by the light splitting and beam splitting to control the laser to generate the conductive structure on the battery tab to obtain the target tab comprises: splitting a processing file of the battery tab based on the arrangement position of the conductive structure in the processing file, to obtain at least two sub-processing files; determining the transmission path of the laser based on each sub-processing file, and adjusting the vibration frequency of the mirror based on the transmission path to control the laser to generate the conductive structure on the battery tab to obtain the target tab.

[0009] Optionally, in a fifth implementation form of the first aspect of the present application, the adjusting the vibration frequency of the mirror based on the transmission path to control the laser to generate the conductive structure on the battery tab to obtain the target tab comprises: when performing the scribing processing on the battery tab, obtaining the running speed of the battery tab processing device and a preset laser scribing speed; calculating the deviation angle according to the running speed and the preset laser scribing speed; adjusting the vibration frequency of the mirror based on the transmission path, and adjusting the incidence angle of the laser based on the deviation angle; and controlling the laser to perform scribing on the battery tab based on the vibration frequency and the incidence angle to generate the conductive structure and obtain the target tab.

[0010] Optionally, in a sixth implementation form of the first aspect of the present application, the adjusting the vibration frequency of the mirror based on the transmission path to control the laser to generate the conductive structure on the battery tab to obtain the target tab comprises: when performing the punching processing on the battery tab, determining the hole spacing and the hole size based on a processing file of the battery tab, and determining the vibration frequency of the mirror based on the hole spacing, the hole size and the transmission path; and controlling the mirror to vibrate at the vibration frequency based on the vibration frequency, to adjust the transmission path of the laser processed by the light splitting and beam splitting, and control the laser to punch on the battery tab to generate the conductive structure and obtain the target tab.

[0011] The second aspect of the present application provides a battery tab preparation device, which comprises:

[0012] The beam splitting module is configured to determine a beam splitting mode of a beam splitter based on a processing file of the battery electrode sheet after the laser emits the laser beam, and split the laser beam according to the beam splitting mode.

[0013] The generating module is configured to adjust a transmission path of the split laser beam by the galvanometer, control the laser beam to generate the conductive structure on the battery electrode sheet, and obtain the target electrode sheet.

[0014] Optionally, in the first implementation manner of the second aspect of the present application, the device further comprises:

[0015] The control module is configured to determine a type of the conductive structure based on the processing file of the battery electrode sheet, determine a frequency range of the laser based on the type, reduce a center frequency of the frequency range to obtain a target frequency of the laser, and control the laser to emit the laser beam at the target frequency.

[0016] Optionally, in the second implementation manner of the second aspect of the present application, the beam splitting module comprises:

[0017] The judging unit is configured to determine whether the battery electrode sheet is a large-format battery electrode sheet according to a size of the battery electrode sheet.

[0018] The splicing unit is configured to splice the galvanometers if the battery electrode sheet is the large-format battery electrode sheet, and normalize the spliced galvanometers to obtain the integrated galvanometers.

[0019] Optionally, in the third implementation manner of the second aspect of the present application, the splicing unit comprises:

[0020] The correction subunit is specifically configured to horizontally correct the galvanometers based on a processing platform in the battery electrode sheet processing device, determine a reference galvanometer, correct the horizontal states of the galvanometers adjacent to the reference galvanometer based on the reference galvanometer as a standard, and sequentially correct the horizontal states of the remaining galvanometers.

[0021] The processing subunit is specifically configured to obtain a sub-coordinate system corresponding to each galvanometer, determine a positional relationship of the sub-coordinate systems based on relative positions of the galvanometers, determine a sub-coordinate system corresponding to the reference galvanometer as a reference coordinate system, and normalize the spliced galvanometers based on the reference coordinate system and the positional relationship to obtain the integrated galvanometers.

[0022] Optionally, in the fourth implementation manner of the second aspect of the present application, the generating module comprises:

[0023] The splitting unit is configured to split the processing file based on arrangement positions of the conductive structures in the processing file of the battery electrode sheet to obtain at least two sub-processing files.

[0024] An adjusting unit is configured to determine a transmission path of the laser based on the sub-processing profile of each battery tab, and adjust a vibration frequency of the galvanometer based on the transmission path, so as to control the laser to generate the conductive structure on the battery tab to obtain the target tab.

[0025] Optionally, in a fifth implementation form of the second aspect of the present application, the adjusting unit comprises:

[0026] The first adjusting sub-unit is specifically configured to obtain a running speed of the battery tab processing device and a preset laser scribing speed when scribing the battery tab, and calculate a deviation angle based on the running speed and the preset laser scribing speed; adjust the vibration frequency of the galvanometer based on the transmission path, and adjust an incident angle of the laser based on the deviation angle; and control the laser to scribe on the battery tab based on the vibration frequency and the incident angle to generate the conductive structure, so as to obtain the target tab.

[0027] Optionally, in a sixth implementation form of the second aspect of the present application, the adjusting unit further comprises:

[0028] The second adjusting sub-unit is specifically configured to determine a hole spacing and a hole size based on the processing profile of the battery tab when punching the battery tab, and determine the vibration frequency of the galvanometer based on the hole spacing, the hole size and the transmission path; control the galvanometer to vibrate at the vibration frequency based on the vibration frequency, so as to adjust the transmission path of the laser after the light splitting and beam splitting processing, control the laser to punch on the battery tab to generate the conductive structure, and obtain the target tab.

[0029] The third aspect of the present application provides a battery tab preparation device, which comprises a memory and at least one processor, and the memory stores instructions; the at least one processor invokes the instructions in the memory, so that the battery tab preparation device performs each step of the battery tab preparation method as described above.

[0030] The fourth aspect of the present application provides a computer readable storage medium, which stores instructions, and the instructions are executed by a processor to realize each step of the battery tab preparation method as described above.

[0031] The technical scheme provided by the present application comprises the following steps: determining the beam splitting mode of the beam splitter based on the processing drawing of the battery pole piece after the laser is emitted by the laser device, performing beam splitting treatment on the laser according to the beam splitting mode, adjusting the transmission path of the laser after the beam splitting treatment by the galvanometer, controlling the laser to generate a conductive structure on the battery pole piece, and obtaining a target pole piece. The present application improves the light emission frequency of the laser device, the beam splitting mode of the beam splitter, the splicing and vibration frequency of the galvanometer, keeps the electrode material in a plane and the laser in a vertical web direction, increases the depth-diameter ratio in the punching process, improves the processing efficiency of the galvanometer in the pole piece preparation process, reduces the heat effect in the battery pole piece preparation process, reduces the preparation cost of the battery pole piece, and improves the preparation efficiency and convenience of the battery pole piece. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The first embodiment schematic diagram of the battery pole piece preparation method provided by the embodiment of the present application is shown in the figure.

[0033] Figure 2 The second embodiment schematic diagram of the battery pole piece preparation method provided by the embodiment of the present application is shown in the figure.

[0034] Figure 3 The schematic diagram of the superimposed scribe line provided by the embodiment of the present application is shown in the figure.

[0035] Figure 4 The schematic diagram of the scribe line deviation angle provided by the embodiment of the present application is shown in the figure.

[0036] Figure 5 The size example diagram of the punching and small deep groove provided by the embodiment of the present application is shown in the figure.

[0037] Figure 6 The structural schematic diagram of the battery pole piece preparation device provided by the embodiment of the present application is shown in the figure.

[0038] Figure 7 The structural schematic diagram of the battery pole piece preparation device provided by the embodiment of the present application is shown in the figure.

[0039] Figure 8 The structural schematic diagram of the battery pole piece preparation device provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0040] For the existing preparation method of the battery pole piece, the application determines the beam splitting mode of the beam splitter based on the processing drawing file of the battery pole piece, and performs light splitting and beam splitting processing on the laser according to the beam splitting mode, adjusts the transmission path of the laser after light splitting and beam splitting processing through the galvanometer, controls the laser to generate a conductive structure on the battery pole piece, and obtains a target pole piece. Through the improvement of the light frequency of the laser, the beam splitting mode of the beam splitter, the splicing and vibration frequency of the galvanometer, the electrode material is kept in the plane and the laser is attached to the vertical running direction, the depth-diameter ratio in the punching process is increased, the processing efficiency of the galvanometer in the pole piece preparation is improved, the heat effect in the battery pole piece preparation process is reduced, the preparation cost of the battery pole piece is reduced, and the preparation efficiency and convenience of the battery pole piece are improved.

[0041] The terms "first", "second", "third", "fourth" and the like in the description and claims of the present application, and above drawings (if any), are used to distinguish similar objects, and do not necessarily have to be used to describe a particular sequential or chronological order. It should be understood that the data thus used can be interchanged, where appropriate, so that the embodiments described herein can be carried out in sequences other than those illustrated or described herein. Furthermore, the terms "comprise" or "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, device, product, or apparatus that includes a list of steps or units as an element of such processes, methods, products, or apparatuses not necessarily limited to those clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products, or apparatuses.

[0042] For the convenience of understanding, the specific flow of the embodiments of the application is described below. Please refer to Figure 1 The first embodiment of the preparation method of the battery pole piece provided by the embodiments of the application is shown in the figure, and the method specifically includes the following steps:

[0043] 101, after the laser emits laser, determine the beam splitting mode of the beam splitter based on the processing drawing file of the battery pole piece, and perform light splitting and beam splitting processing on the laser according to the beam splitting mode.

[0044] The beam splitter comprises a beam splitting material group for beam splitting, and the laser emitted by the laser emits at least two beams of laser after passing through the beam splitter. For determining the beam splitting mode of the beam splitter based on the processing map of the battery electrode sheet, first, the electrode sheet characteristics of the battery electrode sheet and the type of the processing map are determined based on the processing map, it is judged whether the electrode sheet characteristics of the battery electrode sheet meet the beam splitting condition, if yes, the controller is turned on to split the laser emitted by the laser, the processing map is analyzed, the type of the processing map is determined, and when the type of the processing map is a punching processing map, it is confirmed that the beam splitting mode of the laser is a dot matrix mode. In actual application, the processing map can be analyzed, and the preparation efficiency of the target battery electrode sheet under each beam splitting mode can be predicted to determine the optimal beam splitting mode corresponding to the processing map. Wherein, the beam splitting condition is that the size of the battery electrode sheet is a large format size, and the material of the battery electrode sheet is a thin thermal sensitive material, the electrode sheet characteristics include the size and material of the battery electrode sheet, the type of the processing map includes a punching processing map and a scribing processing map, the beam splitting mode includes a single row mode and a dot matrix mode, the single row mode refers to splitting one beam of laser into at least two beams of laser arranged in a row, in the single row mode, the injection trace of the split laser column on the battery electrode sheet is perpendicular / parallel to the running direction of the conveying belt, and the dot matrix mode refers to splitting one beam of laser into at least four beams of laser arranged in a dot matrix, in the dot matrix mode, the split laser dot matrix is a square, and the multiple beams of laser after passing through the beam splitter vertically enter the battery electrode sheet on the conveying belt.

[0045] For splitting the laser based on the beam splitting mode, after determining the beam splitting mode of the beam splitter, the arrangement and combination mode of each beam splitting material group in the beam splitter is adjusted by the controller to adjust the beam splitter to switch the corresponding beam splitting mode, and the corresponding number of laser beams is obtained.

[0046] 102. The transmission path of the laser after the beam splitting processing is adjusted by the galvanometer, and the conductive structure on the battery electrode sheet is generated based on the transmission path control, and the target electrode sheet is obtained.

[0047] Before adjusting the transmission path of the laser after the beam splitting processing by the galvanometer, the parameters of the galvanometer need to be set and the position of the galvanometer needs to be adjusted, specifically, the output end position of the laser after passing through the beam splitter is determined, and the height and rotation direction of the galvanometer are adjusted based on the position of the output end and the position of the conveying belt, the laser beam is controlled to enter the beam expander after being reflected by the galvanometer, and then transmitted to the battery electrode sheet through the total reflection mirror, the output mirror and the Q switch and other optical elements, and the position and angle of the total reflection mirror and the output mirror are adjusted to make the laser beam transmit to the battery electrode sheet in the required direction, and ensure the quality of the laser beam and the beam quality, and the position and angle of the flat field scanning lens are adjusted to control the laser beam to irradiate the battery electrode sheet in the required scanning range and speed.

[0048] The conductive structure includes a hole structure and a line structure, which can be generated by punching or scribing the battery electrode sheet.

[0049] The scheme uses laser to punch and scribe the entire electrode sheet coating area of the negative electrode, and by adjusting the laser process parameters, the hole depth, hole diameter and hole spacing value range are adjusted while ensuring the efficiency, so that the holes uniformly cover the entire electrode sheet coating area.

[0050] In actual application, when punching, a pulse laser is used to emit pulsed laser, and a beam splitter is controlled to switch dot matrix mode to perform beam splitting processing on the laser; when scribing, a pulse laser or a continuous laser is used to control the beam splitter to switch single row mode to perform beam splitting processing on the laser.

[0051] The scheme uses laser to punch and scribe the entire electrode sheet coating area of the negative electrode, and by adjusting the laser process parameters, the hole depth, hole diameter and hole spacing value range are adjusted while ensuring the efficiency, so that the holes uniformly cover the entire electrode sheet coating area.

[0052] Please refer to Figure 2 The second embodiment of the preparation method of the battery electrode sheet provided by the embodiment of the application is schematically shown, and the method specifically includes the following steps:

[0053] 201, control the laser to emit laser at a target frequency.

[0054] Based on the processing drawing file of the battery electrode sheet, the type of the conductive structure is determined, and based on the type, the frequency range of the laser is determined, and the center frequency of the frequency range is reduced to obtain the target frequency of the laser, and the laser is controlled to emit laser at the target frequency. The processing drawing file is analyzed to obtain the type of the conductive structure in the processing drawing file, wherein the type of the conductive structure includes a hole conductive structure and a line conductive structure, and the corresponding laser frequency range of each type of conductive structure is determined in advance, after the type of the conductive structure is determined, the corresponding laser frequency range is obtained, and the laser is parameterized to adjust the center frequency of the laser.

[0055] The laser emits light at a fixed frequency, and through the uniform movement of the galvanometer or rotating mirror, a uniform and equidistant point or line is generated. The interval is the galvanometer speed divided by the laser frequency, that is, the interval of the points, and the line interval is the software-guided point / line interval. In actual production, the point interval is controlled by changing the galvanometer running speed and the laser frequency. When the point interval is smaller than the point size, the final effect can be converted from punching to scribing. At the same time, if the fixed punching interval is fixed, it means that the scribing speed and the frequency ratio are fixed. When the fixed punching interval is fixed, the ordinary galvanometer angular velocity is limited, and the F100-F160 field mirror speed is generally within 10000 mm / s, and the F254-F330 field mirror has a larger spot and a poor punching effect, and the high-speed galvanometer speed can only reach 20000-30000 mm / s. In this case, the center frequency of the laser is reduced, and a lower frequency is used for punching. For example, when the punching frequency of the laser is 20khz-200khz, the center frequency of the laser is set to 50khz, the punching efficiency is improved, and the power waste of the laser is reduced.

[0056] 202. The laser is split by the beam splitter based on the splitting mode to obtain at least two beams of laser.

[0057] The beam splitter has two splitting modes, one is a single row mode, and the other is a dot array mode. In the single row mode, the beam splitter can divide one beam of light into 2-20 beams, and the multiple beams of laser are arranged in turn along the walking direction of the conveying belt for punching / scribing. In the dot array mode, the beam splitter can divide one beam of light into a 2*2-20*20 beam dot array. In this way, multiple rows of laser at the same position are arranged in turn and multiple times of pulsed punching, and the small energy and multiple punching / scribing scheme is used to replace the single pulse and high energy scheme, so that the problem of large hole diameter and poor consistency caused by the overflow of punching gas when a single strong pulse laser is used for punching can be avoided, and the efficiency and energy of dot scribing are balanced.

[0058] After determining the splitting mode of the beam splitter, the splitting angle of each beam of laser is adjusted by rotating or translating the beam splitter, so as to adjust the angle and position of each beam of laser and ensure that the optical paths of each beam of laser are aligned. After the splitting angle is adjusted and the optical paths are aligned, the beam splitter is fixed at the corresponding position by using a fixing device.

[0059] 203. When the battery pole piece is a large-format battery pole piece, the galvanometers are spliced, and the normalized processing is performed on the spliced galvanometers to obtain an integrated galvanometer.

[0060] The horizontal states of the mirrors adjacent to the reference mirror are corrected based on the reference mirror as the standard, and the horizontal states of the remaining mirrors are sequentially corrected; the corresponding sub-coordinate systems of the mirrors are obtained, and the positional relationship of the sub-coordinate systems is determined based on the relative positions of the mirrors; the sub-coordinate system corresponding to the reference mirror is determined as the reference coordinate system, the normalized processing is performed on the spliced mirrors based on the reference coordinate system and the positional relationship, and the integrated mirror is obtained.

[0061] First, the precise positioning correction is performed on a mirror, the mirror is confirmed as the reference mirror, the horizontal states of the mirrors adjacent to the reference mirror are adjusted according to the position and angle of the reference mirror, the position and angle data of each mirror are measured and recorded when the horizontal states of the adjacent mirrors are adjusted, the position and angle of each adjacent mirror are measured and verified by using a laser interferometer, a photoelectric encoder and the like after the horizontal state adjustment of the adjacent mirrors is completed. After the horizontal correction of all the mirrors is completed, the positional relationship of the sub-coordinate systems corresponding to the mirrors is the coincidence relationship, the normalized processing is performed on the spliced mirrors, a reference coordinate system is determined for the spliced mirrors, and a fixed point in the laser processing device is usually taken as the origin. For each mirror, a sub-coordinate system fixedly connected to the mirror is set, and the origin of the sub-coordinate system is usually located at a fixed position of the mirror, for example, the rotation center of the mirror. The accurate position and attitude of each mirror relative to the reference coordinate system are measured, a mathematical model is established based on the measured relative position data, and the integrated mirror is obtained. The model usually includes a translation vector and a rotation matrix, which are used to describe the transformation of each sub-coordinate system relative to the reference coordinate system.

[0062] Specifically, the mechanical structure of each galvanometer is leveled using a leveling ruler to ensure that the galvanometer and the processing stage are within an acceptable error range, specifically 0.03mm. Then, the galvanometers are leveled relative to each other, ensuring the level of their mechanical structures is within an acceptable error range, specifically 0.05mm. Using the first galvanometer as a reference, the two adjacent galvanometers are leveled, and so on, until all galvanometers are relatively level. After the galvanometer mechanical structures are relatively level, laser emission is performed. Each individual galvanometer requires high-precision calibration to ensure that the maximum displacement of the galvanometer during vibration, i.e., the accuracy of the amplitude, is within 0.03mm. Next, each galvanometer is stitched together with its corresponding BOX. Specifically, the stitching order, points, and angles are first determined. Based on the stitching scheme, the parameters of the laser equipment, including laser power, frequency, and scanning speed, are adjusted to ensure consistent processing results for each BOX. The BOXes to be stitched are positioned and fixed, and auxiliary tools are used to ensure the accurate position and angle of each BOX. Following the stitching scheme, each BOX is processed sequentially to ensure alignment and connection of the stitching points. In practical applications, using the first laser as a reference, the stitching of BOXes between two adjacent galvanometers is corrected to ensure complete overlap of the edges of the two BOXes. Then, BOX stitching is performed between the corrected galvanometer and another adjacent galvanometer, achieving absolute parallelism between all BOXes and absolute overlap of the edges of adjacent BOXes, resulting in uniformity across multiple galvanometers. Finally, the coordinate system is normalized using software, ensuring that the coordinate positions of multiple galvanometers are based on the stitched large BOX.

[0063] Furthermore, the position of the battery electrode is detected by a sensor or CCD, and the deviation data is transmitted to the galvanometer through a negative feedback function. The galvanometer compensates for the coordinate position to ensure that the stitched position is a whole offset.

[0064] 204. Split the processing drawings of the battery electrode to obtain at least two sub-processing drawings, and determine the laser transmission path based on each sub-processing drawing.

[0065] When splitting the processing drawings of battery electrodes, the processing drawings are first parsed to extract conductive structures with the same spacing. Then, using the initial conductive structure as a reference and the spacing between conductive structures as the splitting condition, conductive structures with the same spacing are extracted to obtain sub-processing drawings. Please refer to [link to relevant documentation]. Figure 3The schematic diagram of the superimposed scribe line provided by the embodiment of the present application is obtained by splitting the machining drawing file to obtain a sub-machining drawing file 1 and a sub-machining drawing file 2, performing punching / scribing based on the sub-machining drawing file respectively, and then superimposing the results of the two punching / scribing operations to obtain the target battery pole piece. In actual application, for the preparation process of the battery pole piece based on the laser generated conductive structure to obtain the target structure, only the machining drawing file is changed, and a double-layer drawing file is set to achieve a substantial reduction in heat effect accumulation and avoid the problem of focal plane deviation caused by bulging. Specifically, the splitting of the machining drawing file can be achieved by interlaced misplacement, and a double drawing file is set in the marking software. First, the first drawing file is used to perform wide-interval scribing / punching, and then the second drawing file is used to perform wide-interval misplacement superimposition. The effect can achieve the purpose of smaller heat accumulation, and finally reduce the occurrence of problems such as foil or pole piece wrinkling and embrittlement.

[0066] Further, when performing the punching operation, a single strong pulse generates gas overflow, resulting in an excessively wide hole diameter. A multiple-pulse punching method can be used to make the bottom of the battery pole piece uniform. Based on the pole piece characteristics of the battery pole piece, it is determined whether the battery pole piece meets the repeated punching condition. If yes, the conveying belt is controlled to be stationary, the energy of the laser emitted by the laser is reduced, and multiple rows of lasers are used to perform multiple-pulse punching at the same position of the battery pole piece. That is, a small-energy, multiple-punching / scribing scheme is used to replace the single-pulse, high-energy scheme during the punching operation, thereby avoiding the problem of excessively large hole diameter and poor consistency caused by gas overflow during single strong pulse laser punching, and achieving a balance between the efficiency and energy of the dot scribing.

[0067] 205. Determine the vibration frequency of the galvanometer based on the transmission path, and control the vibration of the galvanometer based on the vibration frequency to adjust the transmission path of the laser.

[0068] Please refer to Figure 4The schematic diagram of the line deviation angle provided by the embodiment of the present application, in the laser line process, if only the angle of the laser entering the battery pole piece is controlled to be vertical, due to the influence of the conveying belt speed, the actual line effect will be deviated, according to the conveying belt speed and the laser line speed in the line design direction of the conveying belt and the line direction, the deviation angle is calculated, and the laser entering angle is adjusted based on the deviation angle, the vibration frequency of the galvanometer is adjusted, and the target vibration frequency and the target entering angle of the galvanometer are obtained. Specifically, assuming that the conveying belt speed is V1, the laser line speed is V2, and the line design length is Y, the deviation length X=Y / V2*V1 can be calculated, the deviation angle is α=arctanX / Y=arctanV1 / V2, the preset reverse line angle of the laser β=-α=-arctanV1 / V2 is calculated based on the deviation angle, and the laser angle of the output end of the galvanometer is adjusted based on the preset reverse line angle. Further, according to the real-time feedback of the conveying belt speed and the laser line speed, the line is deviated by a certain angle through the drawing file, and the actual angle is recognized through the recognizer to realize signal feedback, so that the line is always perpendicular to the conveying direction when the conveying speed and the line speed change, and the problem of line deviation caused by high speed and large format line is avoided.

[0069] For determining the vibration frequency of the galvanometer based on the transmission path, first, the straight-line distance from the output end of the galvanometer in the battery pole piece preparation device to the battery pole piece is determined, the length of the transmission path is obtained, and the number of times of reflection of the laser beam in the galvanometer and the vibration frequency are determined according to the length of the transmission path, the vibration frequency is controlled based on the vibration frequency, and the transmission path of the laser is adjusted. Specifically, first, the transmission path of the laser is determined, including the emission point of the laser, the galvanometer passed through and the target point finally reached, the relationship between the vibration frequency and the transmission path is analyzed, and the initial vibration frequency of the galvanometer is set according to the target transmission path, in the laser transmission process, the sensor is used to monitor the transmission state of the laser in real time, such as the stability and position of the light beam, and a feedback control system is established based on the detection data, and the vibration frequency of the galvanometer is automatically adjusted according to the monitoring data.

[0070] 206, based on the laser after adjusting the path, the battery pole piece is perforated and lined, a conductive structure is generated, and a target pole piece is obtained.

[0071] Please refer to Figure 5The size example diagram of the punching and small deep groove provided by the embodiment of the present application, when the laser is used to punch a round hole, there may be a light spot distortion condition, at this time, the scribe line width fluctuation is still within the range of plus or minus 10 mu m, but the punching hole diameter fluctuation exceeds the standard, resulting in that the round hole is distorted into an oval hole, at this time, the hole spacing can be reduced to reduce the influence of the round hole distortion, or a small deep groove is punched on the battery pole piece by the laser, at this time, the conductive structure is a groove-shaped conductive structure. Specifically, the small deep groove is between the punching scribe lines and is in the shape of a cuboid, the groove depth is 2 um-200 um, and the groove width is 2-500 um, so as to reduce the influence of the light spot distortion caused by the large area edge light blocking or the material belt shaking, and at the same time, the low loss of the material area during the laser surface treatment is considered.

[0072] The battery pole piece processing device includes a laser, a beam splitter and a galvanometer. After the light beam is emitted from the laser, the laser is divided into multiple beams by the beam splitter and enters the galvanometer. Through the high-speed swing of the XY axis of the galvanometer, the reflection and focusing of the laser beam are achieved, and finally the uniform punching is realized. Specifically, the pole piece is fed to the laser punching station, the laser parameters and the laser control software are adjusted, the laser beam enters the light hole through the rotating mirror, and then the laser is reflected to the high-speed rotating multi-faceted prism surface through the reflecting mirror. Through the high-speed rotation of the prism, the laser beam is reflected and focused on the pole piece coating area through the field lens, so as to realize the high-speed and uniform laser punching on the pole piece.

[0073] The scheme uses laser to punch and scribe on the coating layer of the lithium battery pole piece, increases the porosity of the pole piece, thereby increasing the volume fraction of the electrolyte in the electrode, increasing the effective conductivity of lithium ions, improving the charge and discharge efficiency and energy density of the battery, cutting off the current conduction between the upper and lower parts, and improving the safety performance of the battery.

[0074] The preparation method of the battery pole piece in the embodiment of the present application is described above, and the preparation device of the battery pole piece in the embodiment of the present application is described in detail from the perspective of the modular functional entity. Please refer to Figure 6 The preparation device of the battery pole piece provided by the embodiment of the present application includes:

[0075] The beam splitting module 310 is used to determine the beam splitting mode of the beam splitter based on the processing drawing of the battery pole piece after the laser is emitted by the laser, and performs beam splitting processing on the laser according to the beam splitting mode.

[0076] The generation module 320 is used to adjust the transmission path of the laser after the beam splitting processing, control the laser to generate the conductive structure on the battery pole piece, and obtain the target pole piece.

[0077] The scheme is based on the processing file of the battery pole piece to determine the beam splitting mode of the beam splitter, and the laser is split and processed according to the beam splitting mode, the transmission path of the laser after the splitting and processing is adjusted by the galvanometer, the laser is controlled to generate a conductive structure on the battery pole piece to obtain a target pole piece, and the preparation of the battery pole piece is realized.

[0078] Please refer to Figure 7 The embodiment of the application provides another structural schematic diagram of the preparation device of the battery pole piece, which comprises:

[0079] The beam splitting module 410 is configured to determine the beam splitting mode of the beam splitter based on the processing file of the battery pole piece after the laser is emitted by the laser, and split and process the laser according to the beam splitting mode.

[0080] The generation module 420 is configured to adjust the transmission path of the laser after the splitting and processing by the galvanometer, control the laser to generate a conductive structure on the battery pole piece, and obtain a target pole piece.

[0081] In the embodiment, the device further comprises:

[0082] The control module 430 is configured to determine the type of the conductive structure based on the processing file of the battery pole piece, determine the frequency range of the laser based on the type, reduce the center frequency of the frequency range to obtain a target frequency of the laser, and control the laser to emit the laser at the target frequency.

[0083] In the embodiment, the beam splitting module 410 comprises:

[0084] The judgment unit 411 is configured to determine whether the battery pole piece is a large-format battery pole piece according to the pole piece size of the battery pole piece.

[0085] The splicing unit 412 is configured to splice each galvanometer if the battery pole piece is a large-format battery pole piece, and perform normalization processing on the spliced galvanometers to obtain an integrated galvanometer.

[0086] In the embodiment, the splicing unit 412 comprises:

[0087] The correction sub-unit 4121 is configured to perform horizontal correction on each galvanometer based on the processing platform in the battery pole piece processing device, determine a reference galvanometer, correct the horizontal state of each galvanometer adjacent to the reference galvanometer based on the reference galvanometer as a standard, and sequentially correct the horizontal state of the remaining galvanometers.

[0088] The processing sub-unit 4122 is configured to obtain a sub-coordinate system corresponding to each galvanometer, determine the positional relationship of each sub-coordinate system based on the relative positions of the galvanometers, determine the sub-coordinate system corresponding to the reference galvanometer as a reference coordinate system, and perform normalization processing on the spliced galvanometers based on the reference coordinate system and the positional relationship to obtain an integrated galvanometer.

[0089] In the embodiment, the generating module 420 comprises:

[0090] The splitting unit 421 is configured to split the processing map of the battery pole piece based on the arrangement position of the conductive structure in the processing map, to obtain at least two sub-processing maps.

[0091] The adjusting unit 422 is configured to determine the transmission path of the laser based on each sub-processing map, and adjust the vibration frequency of the galvanometer based on the transmission path, to control the laser to generate the conductive structure on the battery pole piece, to obtain the target pole piece.

[0092] In the embodiment, the adjusting unit 422 comprises:

[0093] The first adjusting sub-unit 4221 is specifically configured to, when performing the scribing process on the battery pole piece, acquire the running speed of the battery pole piece processing device and a preset laser scribing speed, calculate the deviation angle based on the running speed and the preset laser scribing speed, adjust the vibration frequency of the galvanometer based on the transmission path, and adjust the incidence angle of the laser based on the deviation angle, and control the laser to perform scribing on the battery pole piece based on the vibration frequency and the incidence angle, to generate the conductive structure, to obtain the target pole piece.

[0094] In the embodiment, the adjusting unit 422 further comprises:

[0095] The second adjusting sub-unit 4222 is specifically configured to, when performing the punching process on the battery pole piece, determine the hole spacing and the hole size based on the processing map of the battery pole piece, and determine the vibration frequency of the galvanometer based on the hole spacing, the hole size and the transmission path, and control the galvanometer to vibrate at the vibration frequency based on the vibration frequency, to adjust the transmission path of the laser after the light splitting and beam splitting process, to control the laser to punch on the battery pole piece, to generate the conductive structure, to obtain the target pole piece.

[0096] The scheme improves the light frequency of the laser, the beam splitting mode of the beam splitter, the splicing and vibration frequency of the galvanometer, keeps the electrode material in a plane and the laser adheres to the vertical running direction, increases the depth-diameter ratio in the punching process, improves the processing efficiency of the galvanometer when preparing the pole piece, and reduces the thermal influence in the preparation process of the battery pole piece.

[0097] The above Figures 6-7 The battery pole piece preparation device in the embodiment of the application is described in detail from the perspective of the modular functional entity, and the battery pole piece preparation device in the embodiment of the application is described in detail from the perspective of hardware processing.

[0098] Referring to Figure 8As shown, the battery pole piece preparation device includes a processor 800 and a memory 801, the memory 801 stores machine executable instructions capable of being executed by the processor 800, and the processor 800 executes the machine executable instructions to implement the battery pole piece preparation method described above.

[0099] Further, Figure 8 The battery pole piece preparation device as shown further includes a bus 802 and a communication interface 803, and the processor 800, the communication interface 803 and the memory 801 are connected through the bus 802.

[0100] The memory 801 can include a high-speed random access memory (RAM), and can also include a non-volatile memory, for example, at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 803 (which can be wired or wireless), and the Internet, a wide area network, a local area network, a metropolitan area network, etc. can be used. The bus 802 can be an ISA bus, a PCI bus, an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one bidirectional arrow is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0101] The processor 800 can be an integrated circuit chip having a processing capability of signals. In the implementation process, each step of the above method can be completed by the integrated logic circuit of hardware in the processor 800 or the instruction in the form of software. The processor 800 described above can be a general processor, including a central processing unit (CPU), a network processor (NP), etc.; can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. Each method, step and logic block disclosed in the embodiments of the present disclosure can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiments of the present disclosure can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the memory 801, and the processor 800 reads the information in the memory 801, and combines the hardware to complete the method steps of the above embodiments.

[0102] The present application also provides a computer readable storage medium, which can be a non-volatile computer readable storage medium, and can also be a volatile computer readable storage medium, and the computer readable storage medium has instructions stored therein, and when the instructions are run on a computer, the computer executes each step of the preparation method of the battery pole piece provided by each embodiment.

[0103] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described device or apparatus, unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0104] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the entire or part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0105] The above-described embodiments are merely used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some of the technical features; and these modifications or replacements do not cause the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preparing a battery pole piece, applied to a battery pole piece processing device, characterized in that, The battery pole piece processing device comprises a laser, a beam splitter and a galvanometer, and the preparation method comprises the following steps: After the laser emits laser light, the splitting mode of the beam splitter is determined based on the processing file of the battery pole piece, and the laser light is subjected to splitting and splitting processing according to the splitting mode; The transmission path of the laser light after the splitting and splitting processing is adjusted by the galvanometer, and the galvanometer is controlled to generate a conductive structure on the battery pole piece based on the transmission path, thereby obtaining a target pole piece; Before the transmission path of the laser light after the splitting and splitting processing is adjusted by the galvanometer, the following steps are further included: determining whether the battery pole piece is a large-format battery pole piece according to the pole piece size of the battery pole piece; if so, the horizontal state of each galvanometer is corrected based on the processing platform in the battery pole piece processing device, a reference galvanometer is determined, the horizontal state of each galvanometer adjacent to the reference galvanometer is corrected based on the reference galvanometer as a standard, and the horizontal state of the remaining galvanometers is sequentially corrected; the corresponding sub-coordinate system of each galvanometer is obtained, and the positional relationship of each sub-coordinate system is determined based on the relative positions of the galvanometers; the sub-coordinate system corresponding to the reference galvanometer is determined as a reference coordinate system, and the normalized processing of the spliced galvanometers is performed based on the reference coordinate system and the positional relationship, thereby obtaining an integrated galvanometer; The transmission path of the laser light after the splitting and splitting processing is adjusted by the galvanometer, and the galvanometer is controlled to generate a conductive structure on the battery pole piece based on the transmission path, thereby obtaining a target pole piece, which comprises the following steps: the processing file is split based on the arrangement position of the conductive structure in the processing file of the battery pole piece, thereby obtaining at least two sub-processing files; the transmission path of the laser light is determined based on each sub-processing file, and the vibration frequency of the galvanometer is adjusted based on the transmission path, thereby controlling the laser light to generate a conductive structure on the battery pole piece, thereby obtaining a target pole piece.

2. The method of claim 1, wherein the method further comprises: The preparation method further comprises the following steps: The type of the conductive structure is determined based on the processing file of the battery pole piece, the frequency range of the laser is determined based on the type, the center frequency of the frequency range is reduced, thereby obtaining the target frequency of the laser, and the laser is controlled to emit laser light at the target frequency.

3. The method for preparing battery electrode sheets according to claim 1, characterized in that, The transmission path of the laser light after the splitting and splitting processing is adjusted by the galvanometer, and the galvanometer is controlled to generate a conductive structure on the battery pole piece based on the transmission path, thereby obtaining a target pole piece, which comprises the following steps: When performing scribing processing on the battery pole piece, the running speed of the battery pole piece processing device and the preset laser scribing speed are obtained; The deviation angle is obtained by calculating based on the running speed and the preset laser scribing speed; The vibration frequency of the galvanometer is adjusted based on the transmission path, and the incidence angle of the laser light is adjusted based on the deviation angle; The laser light is controlled to perform scribing on the battery pole piece based on the vibration frequency and the incidence angle, thereby generating a conductive structure and obtaining a target pole piece.

4. The method of claim 1, wherein the method further comprises: The transmission path of the laser light after the splitting and splitting processing is adjusted by the galvanometer, and the galvanometer is controlled to generate a conductive structure on the battery pole piece based on the transmission path, thereby obtaining a target pole piece, which comprises the following steps: When performing punching processing on the battery pole piece, the hole spacing and the hole size are determined based on the processing file of the battery pole piece, and the vibration frequency of the galvanometer is determined based on the hole spacing, the hole size and the transmission path; The galvanometer is controlled to vibrate at the vibration frequency based on the vibration frequency, the transmission path of the laser after the beam splitting and splitting processing is adjusted, the laser is controlled to punch holes on the battery pole piece, a conductive structure is generated, and a target pole piece is obtained.

5. An apparatus for preparing battery electrodes, characterized in that, The preparation device of the battery pole piece comprises: A beam splitting module is configured to determine a beam splitting mode of a beam splitter based on a processing file of the battery pole piece after the laser is emitted by a laser, and perform beam splitting and splitting processing on the laser according to the beam splitting mode. A generation module is configured to adjust the transmission path of the laser after the beam splitting and splitting processing by a galvanometer, control the laser to generate a conductive structure on the battery pole piece, and obtain a target pole piece. Before the transmission path of the laser after the beam splitting and splitting processing is adjusted by the galvanometer, the method further comprises: determining whether the battery pole piece is a large-format battery pole piece according to the size of the pole piece; if yes, horizontally correcting each galvanometer based on a processing platform in a battery pole piece processing device, determining a reference galvanometer, taking the reference galvanometer as a standard to correct the horizontal state of each galvanometer adjacent to the reference galvanometer, and sequentially correcting the horizontal state of the remaining galvanometers; obtaining a sub-coordinate system corresponding to each galvanometer, and determining the positional relationship of each sub-coordinate system based on the relative positions of the galvanometers; determining the sub-coordinate system corresponding to the reference galvanometer as a reference coordinate system, performing normalization processing on each galvanometer after splicing based on the reference coordinate system and the positional relationship, and obtaining an integrated galvanometer. The generation module comprises: a splitting unit configured to split the processing file based on the arrangement position of the conductive structure in the processing file of the battery pole piece, and obtain at least two sub-processing files; and an adjustment unit configured to determine the transmission path of the laser based on each sub-processing file, adjust the vibration frequency of the galvanometer based on the transmission path, control the laser to generate a conductive structure on the battery pole piece, and obtain a target pole piece.

6. A device for preparing battery electrode sheets, characterized in that, The preparation device of the battery pole piece comprises a memory and at least one processor, and the memory stores instructions; the at least one processor invokes the instructions in the memory to enable the preparation device of the battery pole piece to perform each step of the preparation method of the battery pole piece according to any one of claims 1-4.

7. A computer-readable storage medium having stored thereon instructions, the computer-readable storage medium comprising: The instructions are executed by the processor to implement each step of the preparation method of the battery pole piece according to any one of claims 1-4.

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