Method and apparatus for laminating electrode sheet of battery cell

Abstract

To provide a method and an apparatus for laminating electrode sheets of a battery cell.SOLUTION: An apparatus for laminating electrode sheets of a battery cell includes: a first transport assembly 11 and a second transport assembly 12 for transporting first electrode sheets 101 and second electrode sheets 102, respectively; a sheet stacking table 3; a first robot arm; a second robot arm; and a separator assembly 4 for coating. The first robot arm simultaneously grabs m×n first electrode sheets 101 having been corrected from a first position correction stage 21 and simultaneously places the m×n first electrode sheets 101 in m rows and n columns on a separator 41 of the same sheet stacking table 3 to perform sheet lamination. The second robot arm simultaneously grabs m×n second electrode sheets 102 having been corrected from a second position correction stage 22 and simultaneously places the m×n second electrode sheets 102 in m rows and n columns on a separator 41 of the same sheet stacking table 3 to perform the sheet lamination.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present application relates to the field of lithium ion battery technology, and in particular to a method and apparatus for laminating electrode sheets of battery cells. [Background technology]

[0002] In the related art, a battery cell is a core component of a battery, and a lithium-ion battery cell is formed by stacking multiple layers of electrode sheets and separators between the electrode sheets. Conventional sheet lamination methods using sheet lamination machines generally involve stacking sheets layer by layer or attaching some electrode sheets and then inserting the remaining electrode sheets during the sheet lamination process. The principle of layer by layer sheet lamination is to use a sheet lamination machine to fold a continuous separator into a Z-shape and embed the positive and negative electrode sheets at intervals into the separator's intermediate layer to form a sheet laminate. Conventional methods of attaching some electrode sheets and then inserting the remaining electrode sheets during the sheet lamination process generally involve first attaching the positive electrode sheet onto the separator, and then inserting the negative electrode sheet into the separator's intermediate layer during the separator folding process to form a sheet laminate. However, these two methods have slow sheet lamination speeds and low sheet lamination efficiency, making it difficult to meet the demand for high-efficiency production. Summary of the Invention [Problem to be solved by the invention]

[0003] The embodiments of the present application provide a method and apparatus for stacking electrode sheets of a battery cell, which aims to solve the problems of the slow sheet stacking speed and low sheet stacking efficiency of conventional sheet laminators. [Means for solving the problem]

[0004] The present application provides a method for laminating electrode sheets of a battery cell, the method comprising: a step in which a first robot arm simultaneously grabs m×n first electrode sheets from a first transport assembly and places them on a first position correction stage for position correction, and a second robot arm simultaneously grabs m×n second electrode sheets from a second transport assembly and places them on a second position correction stage for position correction, where m is a positive integer equal to or greater than 1 and n is a positive integer equal to or greater than 2; A step in which a separator assembly coats a first layer of separator on a sheet stacking base; the first robot arm simultaneously picking up the m×n first electrode sheets corrected from the first position correction stage, and simultaneously placing the m×n first electrode sheets in m rows and n columns on a first layer of separator on the same sheet stacking table; a separator assembly coating a second layer of separator onto the m×n first electrode sheets; the second robot arm simultaneously picking up the m×n second electrode sheets corrected from the second position correction stage, and simultaneously placing the m×n second electrode sheets in m rows and n columns on a second layer of separator on the same sheet stacking table, thereby completing one sheet stacking of the first electrode sheets and the second electrode sheets; and a step of repeatedly performing the sheet stacking step of the first electrode sheet and the second electrode sheet until a preset stopping condition is reached, to obtain a sheet stacked unit.

[0005] The present application further provides a stacking device for electrode sheets of a battery cell that is applicable to the above-mentioned method, the device including a first transport assembly for transporting a first electrode sheet, a second transport assembly for transporting a second electrode sheet, a first correction stage for correcting the position of the first electrode sheet, a second correction stage for correcting the position of the second electrode sheet, a sheet stacking table, a first robot arm, a second robot arm, and a separator assembly for coating, the first correction stage and the second correction stage being provided on both sides of the sheet stacking table, respectively, and the first transport assembly being configured to transport the first electrode sheet, the first robot arm is provided on a side of the correction stage away from the sheet stacking table, the second transport assembly is provided on a side of the second correction stage away from the sheet stacking table, the first robot arm is used to simultaneously grab and place a plurality of the first electrode sheets and transport the first electrode sheets by moving back and forth between the first transport assembly, the first correction stage, and the sheet stacking table, and the second robot arm is used to simultaneously grab and place a plurality of the second electrode sheets and transport the second electrode sheets by moving back and forth between the second transport assembly, the second correction stage, and the sheet stacking table. [Effects of the Invention]

[0006] In the present application, a separator assembly is repeatedly coated on a sheet stacking table, and a first robot arm and a second robot arm alternately stack first electrode sheets and second electrode sheets, ultimately obtaining a sheet stacking unit. By stacking m × n electrode sheets simultaneously on the same sheet stacking table in an arrangement of m rows and n columns, multiple electrode sheets can be stacked at once, significantly improving the sheet stacking speed and efficiency. [Brief explanation of the drawings]

[0007] In order to more clearly describe the technical solutions of the embodiments of the present application, the drawings that need to be used in the description of the embodiments are briefly introduced below. It is clear that the drawings in the following description are some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without any creative efforts.

[0008] [Figure 1] FIG. 2 is a schematic diagram of a stacking device for stacking electrode sheets of a battery cell according to an embodiment of the present application. [Figure 2] FIG. 10 is a schematic diagram of a stacking device for stacking electrode sheets of a battery cell according to another embodiment of the present application. [Figure 3] 1 is a schematic perspective view of first and second robot arms of a stacking device for electrode sheets of a battery cell according to an embodiment of the present application. FIG. [Figure 4] 1 is a schematic top view of first and second robot arms of a stacking device for electrode sheets of a battery cell according to an embodiment of the present application. FIG. [Figure 5] 2 is a schematic side view of first and second robot arms of a stacking device for electrode sheets of a battery cell according to an embodiment of the present application. FIG. [Figure 6] FIG. 4 is an enlarged view of part A in FIG. [Figure 7] FIG. 4 is an enlarged view of part B in FIG. [Figure 8] 1 is a flowchart of steps of a method for laminating electrode sheets of a battery cell according to an embodiment of the present application. [Figure 9] 4 is a flowchart of steps of a method for laminating electrode sheets of a battery cell according to another embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0009] 1 to 7, FIGS. 1 and 2 are schematic diagrams of a stacking device for stacking electrode sheets of a battery cell provided in an embodiment of the present application, and the stacking device for stacking electrode sheets of a battery cell includes a first transport assembly 11 for transporting a first electrode sheet 101, a second transport assembly 12 for transporting a second electrode sheet 102, a first correction stage 21 for correcting the position of the first electrode sheet 101, a second correction stage 22 for correcting the position of the second electrode sheet 102, a sheet stacking table 3, a first robot arm, a second robot arm, and a separator assembly 4 for coating, and the first correction stage 21 and the second correction stage 22 are provided on both sides of the sheet stacking table 3, respectively, and The first transport assembly 11 is provided on the side of the first correction stage 21 away from the sheet stacking table 3, and the second transport assembly 12 is provided on the side of the second correction stage 22 away from the sheet stacking table 3, and the first robot arm is used to simultaneously grab and place multiple first electrode sheets 101 and transport the first electrode sheets 101 by moving back and forth between the first transport assembly 11, the first correction stage 21, and the sheet stacking table 3, and the second robot arm is used to simultaneously grab and place multiple second electrode sheets 102 and transport the second electrode sheets 102 by moving back and forth between the second transport assembly 12, the second correction stage 22, and the sheet stacking table 3.

[0010] Specifically, the sheet stacking table 3 is a stage for stacking electrode sheets and is provided at a central position. The separator assembly 4 is provided above the sheet stacking table 3 and includes a separator 41 unwinding mechanism and a coating device that introduces the separator 41 onto the sheet stacking table 3. The coating device is used to fold the separator 41 into a Z-shape, and the separator 41 is continuously coated. The first correction stage 21 and the second correction stage 22 are provided on both the left and right sides of the sheet stacking table 3, respectively. For example, the first correction stage 21 is located on the left side of the sheet stacking table 3, and the second correction stage 22 is located on the right side of the sheet stacking table 3. The first transport assembly 11 is located on the left side of the first correction stage 21, and the second transport assembly 12 is located on the right side of the second correction stage 22. The first electrode sheet 101 passes from left to right through the first transport assembly 11 and the first correction stage 21 and then reaches the sheet stacking table 3. The second electrode sheet 102 passes from right to left through the second transport assembly 12 and the second correction stage 22 and then reaches the sheet stacking table 3. The first electrode sheet 101 is transported by a first robot arm, and the second electrode sheet 102 is transported by a second robot arm. The first robot arm can reciprocate between the first transport assembly 11, the first correction stage 21, and the sheet stacking table 3, and the second robot arm can reciprocate between the second transport assembly 12, the second correction stage 22, and the sheet stacking table 3. The first robot arm can simultaneously pick up and place multiple first electrode sheets 101, and the second robot arm can simultaneously pick up and place multiple second electrode sheets 102. The first robot arm and the second robot arm may have various structural forms, and no limitation is imposed here as long as they are able to simultaneously grasp and place multiple electrode sheets, regardless of the structure.On the same sheet stacking table 3, the separator assembly 4 folds the separator 41 into a Z-shape, and then the first robot arm and the second robot arm alternately place multiple first electrode sheets 101 and multiple second electrode sheets 102 between the folded separators 41, respectively, and separate the first electrode sheets 101 and the multiple second electrode sheets 102 using the separators 41. This process is repeated multiple times to finally form a lithium-ion battery cell with a consistent thickness. Note that the first electrode sheet 101 may be either a positive electrode sheet or a negative electrode sheet, and the second electrode sheet 102 may be either a positive electrode sheet or a negative electrode sheet. When the first electrode sheet 101 is a positive electrode sheet, the second electrode sheet 102 is a negative electrode sheet, and when the first electrode sheet 101 is a negative electrode sheet, the second electrode sheet 102 is a positive electrode sheet.

[0011] In this embodiment, the first robot arm and the second robot arm can simultaneously grasp and place multiple electrode sheets, so that when stacking the sheets, the first robot arm simultaneously stacks multiple first electrode sheets 101 on the same sheet stacking table 3, and the second robot arm simultaneously stacks multiple second electrode sheets 102 on the same sheet stacking table 3, thereby allowing multiple electrode sheets to be stacked at one time.While conventional robot arms can only stack one electrode sheet at a time on the sheet stacking table 3, this embodiment allows multiple electrode sheets to be placed on the sheet stacking table 3 at a time, enabling the operation of stacking multiple electrode sheets simultaneously, thereby significantly improving the sheet stacking speed and efficiency.

[0012] In one embodiment, a first CCD vision device is provided above the first correction stage 21 and a second CCD vision device is provided above the second correction stage 22 .

[0013] Specifically, this embodiment uses visual detection technology to perform position correction on the first electrode sheet 101 and the second electrode sheet 102. Visual detection involves converting the image of an object into an image signal using a machine vision product (i.e., an imaging device, e.g., CMOS or CCD) and transmitting it to a dedicated image processing system. The image signal is then converted into a digital signal based on information such as pixel distribution, brightness, and color. The imaging system then performs various calculations on these signals to extract the object's features and control the operation of on-site equipment based on the results of the discrimination. This embodiment specifically uses a CCD visual device. Specifically, a first CCD visual device is installed above the first correction stage 21, and a second CCD visual device is installed above the second correction stage 22. The CCD visual device is implemented based on a CCD image sensor. The CCD sensor converts light rays into electric charges, which are then converted into digital signals to form a digital image. The CCD sensor can collect images quickly and has relatively high sensitivity and resolution. The acquired digital images are processed using image processing algorithms, including noise removal, filtering, and enhancement, to optimize image quality and make the images more suitable for subsequent analysis and detection. After image processing, the CCD vision device extracts specific features and information from the image, such as color, shape, and size, based on the required detection task. The CCD vision device uses the feature information to detect and determine whether an object meets predetermined criteria, including tasks such as defect detection, product quality evaluation, and object localization. In this embodiment, the CCD vision device mainly performs the task of object localization, i.e., locating the first and second electrode sheets. After the first and second CCD vision devices locate the first and second electrode sheets, if any misalignment exists, the first and second correction stages 21 and 22 correct the positions.

[0014] In this embodiment, the first correction stage 21 and the second correction stage 22 are both UVW stages. The UVW stage is a precision optical alignment device primarily used for 3D localization and measurement of micro-objects. It consists of three mutually perpendicular stages called the U, V, and W stages, each equipped with three adjustable illumination systems and three movable measurement heads. Fine adjustment of these stages and illumination systems enables high-precision 3D localization and measurement of micro-objects. The UVW stage operates based on the three-point method, i.e., it uses the positional relationship of three measurement points to determine the 3D coordinates of the object to be measured. When measuring using a UVW stage, the object to be measured must first be placed on the U stage, and then the U stage must be rotated and flipped so that the measuring needle at the bottom of the U stage corresponds to the first measuring point on the object to be measured. Then, the V stage and W stage are adjusted respectively so that the measuring needles at their bottom correspond to the second and third measuring points on the object to be measured, respectively. During the adjustment process, the distance and angle between the three measuring needles must be kept constant. Once the three measuring needles correspond to three measuring points respectively, the distance and angle between these measuring points can be calculated to determine the three-dimensional coordinates of the object to be measured.

[0015] In a specific implementation, the number of UVW stages is the same as the number of electrode sheets, and the arrangement of the UVW stages is also the same as the arrangement of the electrode sheets. For example, if there are five first electrode sheets 101, five corresponding UVW stages are provided. If there are five second electrode sheets 102, five corresponding UVW stages are provided. That is, each electrode sheet is provided with one position correction stage. If five electrode sheets are arranged in parallel and spaced apart, five UVW stages are also similarly arranged in parallel and spaced apart. If ten electrode sheets are arranged in two rows and five columns, ten UVW stages are also similarly arranged in two rows and five columns. The UVW stages are corrected in conjunction with a CCD vision device. The CCD vision device first identifies the position of each electrode sheet and determines whether the electrode sheet is in the correct position. If a position deviation occurs, the UVW stage corresponding to the misaligned electrode sheet is used to correct the position of the misaligned electrode sheet individually. By disposing the UVW stage and correcting its position relative to the electrode sheets, the electrode sheets can be arranged side by side with intervals in the horizontal and vertical directions, with a certain gap between the electrode sheets.

[0016] Referring to FIG. 3 , in one embodiment, the first robot arm and the second robot arm each include a holder 51 and n suction units 52 connected to the holder 51, where the n suction units 52 are arranged in parallel and spaced apart in the horizontal direction, where n is a positive integer greater than or equal to 2. Specifically, the first robot and the second robot in this embodiment have the same structure and both include a holder 51 and suction units 52. The holder 51 is used to connect the moving stage and to support and connect the multiple suction units 52. The suction units 52 can generate a vacuum suction force to adsorb the electrode sheets. The number of suction units 52 is the same as the number of electrode sheets, and the arrangement of the suction units 52 is also the same as the arrangement of the electrode sheets. In this embodiment, the suction units 52 are arranged in a horizontally spaced arrangement, where the number of suction units 52 is n, where n is a positive integer greater than or equal to 2. For example, five suction units 52 are arranged in a horizontally spaced arrangement. In this embodiment, the multiple electrode sheets on the correction stage are also placed side by side at intervals in the horizontal direction. By providing multiple suction units 52 in parallel at intervals in the horizontal direction in this way, the robot arm can simultaneously suction multiple electrode sheets that are arranged in parallel at intervals in the horizontal direction, and further, it becomes easy to simultaneously arrange multiple electrode sheets in parallel at intervals in the horizontal direction.

[0017] 4 and 5 , in one embodiment, the first robot arm and the second robot arm each include a holder 51 and m×n suction units 52 connected to the holder 51. The suction units 52 are spaced apart in m rows and n columns, where m is a positive integer greater than or equal to 1 and n is a positive integer greater than or equal to 2. Specifically, the first robot and the second robot in this embodiment have the same structure and both include the holder 51 and the suction units 52. The holder 51 is used to connect the moving stage and also to support and connect the multiple suction units 52. The suction units 52 can generate a vacuum suction force to suction the electrode sheets. The number of suction units 52 is the same as the number of electrode sheets, and the arrangement of the suction units 52 is the same as the arrangement of the electrode sheets. In this embodiment, the suction units 52 are arranged vertically and horizontally at intervals so as to be spaced apart in m rows and n columns, where the number of suction units 52 is m×n, where m is a positive integer greater than or equal to 1 and n is a positive integer greater than or equal to 2. For example, 10 suction units 52 are arranged at intervals in 2 rows and 5 columns. In this embodiment, the multiple electrode sheets on the correction stage are also arranged at intervals in 2 rows and 5 columns. By arranging the multiple suction units 52 in parallel in the horizontal direction at intervals in this manner, the robot arm can simultaneously suction multiple electrode sheets arranged in parallel in the horizontal direction at intervals, and further, it becomes easier to simultaneously arrange multiple electrode sheets in parallel in the horizontal direction at intervals.

[0018] 6, in this embodiment, the suction unit 52 includes a suction plate 521, a suction nozzle 522, a first connecting member 523, and a second connecting member 524. The first connecting member 523 and the second connecting member 524 are arranged in layers vertically and fixedly connected to each other, with the first connecting member 523 on the upper layer and the second connecting member 524 on the lower layer. The first connecting member 523 is used to connect to the holder 51. The suction plate 521 is arranged below the second connecting member 524, and is connected to the first connecting member 523 via the suction nozzle 522. Specifically, two elongated connection holes 5231 are provided at both longitudinal ends of the first connecting member 523, and the elongated connection holes 5231 extend along the longitudinal direction of the first connecting member 523. The axial direction of the suction nozzles 522 is the same as the axial direction of the elongated connection holes 5231. That is, the suction nozzles 522 are arranged perpendicular to the first connecting member 523 and the second connecting member 524. One end of each of the two suction nozzles 522 is connected to the two elongated connection holes 5231, and the other end of each of the two suction nozzles 522 is connected to the back side of the suction plate 521. The front side of the suction plate 521 is used to adsorb the electrode sheet, and the front surface of the suction plate 521 is flat to ensure stable adsorption of the electrode sheet. Here, the suction plate 521 is rectangular, with outwardly protruding portions on the edges of the two short sides of the suction plate 521, and the suction nozzles 522 are connected to the protruding portions on the suction plate 521. The connecting slots 5231 allow the vertical position of the attraction plate 521 to be adjusted, and furthermore, maintain the alignment with the vertical position of the electrode sheet.

[0019] Referring to FIG. 7 , the plurality of suction units 52 are arranged at regular intervals in the horizontal direction, and the regular intervals between the suction units 52 are the same as the regular intervals between the electrode sheets. The plurality of suction units 52 are connected by a holder 51, and the entire holder 51 is perpendicular to the suction units 52. Specifically, the holder 51 is arranged along the width direction of the first connecting member 523. The holder 51 includes a third connecting member 511 and a fourth connecting member 512, which are arranged in layers, one above the other, with the third connecting member 511 in the upper layer and the fourth connecting member 512 in the lower layer. The upper side of the third connecting member 511 is used to connect to the moving stage, and the fourth connecting member 512 is connected to the suction unit 52. The moving stage is a mechanism for moving a robot arm, and its structure can be various, for example, a two-axis moving stage, a three-axis moving stage, etc., but is not limited thereto. The number of third connecting members 511 may be one or more, and is not limited thereto. The number of fourth connecting members 512 is the same as the number of suction units 52, and the fourth connecting members 512 are connected to the upper sides of the first connecting members 523 of the suction units 52. The lower layer of one third connecting member 511 can be connected to one or more fourth connecting members 512, i.e., can support multiple suction units 52. The fourth connecting member 512 and the third connecting member 511 can be fixedly or movably connected, for example, the fourth connecting member 512 can be a lockable sliding table, and the fourth connecting member 512 and the third connecting member 511 can be slidably connected, with the sliding direction of the fourth connecting member 512 aligned with the width direction of the first connecting member 523.In this embodiment, two fourth connecting members 512 are connected to the lower layer of one third connecting member 511, one of which is fixedly connected to the third connecting member 511, and the other fourth connecting member 512 is slidably connected to the third connecting member 511. That is, the sliding fourth connecting member 512 can slide laterally toward the fixed fourth connecting member 512 to shorten the distance between them, or the sliding fourth connecting member 512 can slide laterally away from the fixed fourth connecting member 512 to extend the distance between them. Thus, by driving the fourth connecting member 512, it is possible to adjust a certain gap between adjacent suction units 52 in the lateral direction, and further maintain compatibility with the lateral position of the electrode sheet.

[0020] In this embodiment, the suction plate 521 has an internal cavity, which is vacuumed when suction is applied, generating a vacuum suction force, and the front surface of the suction plate 521 has a plurality of suction holes through which the electrode sheets are suctioned. In another embodiment, the suction plates 521 of different suction units 52 can be connected via connecting pipes, allowing the plurality of suction plates 521 to simultaneously generate or release suction force when suction is applied. This allows the robot arm to simultaneously suction and place a plurality of electrode sheets, avoiding misalignment during the suction and lifting process and also avoiding misalignment during the suction and release process for dropping. This ensures synchronization of the suction and placement processes and eliminates the need for an air pump on each suction plate 521, thereby saving costs.

[0021] 8, an embodiment of the present invention further provides a method for stacking electrode sheets for battery cells, which is a flowchart of the steps of the method for stacking electrode sheets for battery cells provided in the embodiment of the present invention, and the method of this embodiment is applicable to the device for stacking electrode sheets for battery cells of the above embodiment. The method includes the following steps S1 to S6.

[0022] In S1, the first robot arm simultaneously grabs m x n first electrode sheets 101 from the first transport assembly 11 and places them on the first position correction stage for position correction, and the second robot arm simultaneously grabs m x n second electrode sheets 102 from the second transport assembly 12 and places them on the second position correction stage for position correction, where m is a positive integer greater than or equal to 1 and n is a positive integer greater than or equal to 2.

[0023] The electrode sheets placed on the first transport assembly 11 and the second transport assembly 12 have already been pre-processed. The pre-processing process includes controlling the tension of the rolled supply material after it is unwound to correct any deflection, die-cutting / cutting the deflected supply material into electrode sheets, surface brushing and dimensional inspection of the electrode sheets after die-cutting / cutting, removing electrode sheets that fail dimensional inspection, and transferring the non-defective electrode sheets after removing the non-defective ones to the transport assembly for temporary storage.

[0024] In one embodiment, the first transport assembly 11 is provided upstream of the first correction stage 21 and is responsible for transporting the first electrode sheet 101 near the first correction stage 21 so that a first robot arm can transport the first electrode sheet 101 between the first transport assembly 11 and the first correction stage 21. Similarly, the second transport assembly 12 is provided upstream of the second correction stage 22 and is responsible for transporting the second electrode sheet 102 near the second correction stage 22 so that a second robot arm can transport the second electrode sheet 102 between the second transport assembly 12 and the second correction stage 22. Both the first transport assembly 11 and the second transport assembly 12 are vacuum suction belts that can generate a vacuum suction force and adsorb and transport multiple electrode sheets by the vacuum suction force generated by the vacuum suction belts. The vacuum suction belt is provided with multiple groups of suction holes arranged at intervals in m rows and n columns, with each group of suction holes being used to adsorb one electrode sheet. Therefore, m×n electrode sheets can be arranged at intervals in m rows and n columns on the vacuum suction belt, and each electrode sheet is stably adsorbed to a corresponding suction hole, ensuring that the electrode sheets do not shift during transportation. Naturally, other adsorption structures may be used as long as the electrode sheets can be arranged at intervals in m rows and n columns, and are not limited thereto. Therefore, in the transportation step of the first transport assembly 11, the m×n first electrode sheets 101 are arranged in m rows and n columns, adsorbed onto the first transport assembly 11, and transported by the first transport assembly 11 to the side of the first position correction stage. In the transport step of the second transport assembly 12, m x n second electrode sheets 102 are arranged in m rows and n columns and adsorbed onto the second transport assembly 12, and transported by the second transport assembly 12 to the side of the second position correction stage.Because the first transport assembly 11 and the second transport assembly 12 arrange the first electrode sheets 101 and the second electrode sheets 102 in m rows and n columns during transport, the first robot arm and the second robot arm can simultaneously grasp the m×n first electrode sheets 101 and the second electrode sheets 102 arranged in m rows and n columns when grasping the first electrode sheets 101 and the second electrode sheets 102. Similarly, when the first robot arm and the second robot arm place the first electrode sheets 101 and the second electrode sheets 102 on the first correction stage 21 and the second correction stage 22, respectively, they can simultaneously place the m×n first electrode sheets 101 and the second electrode sheets 102 arranged in m rows and n columns, significantly improving transport efficiency. Furthermore, since the m × n electrode sheets are already placed on the correction stage in an m-row, n-column pattern, the positions of the m × n electrode sheets are almost accurate, and even if the electrode sheets are misaligned, only fine adjustment is required, greatly improving the efficiency of position identification.

[0025] In this embodiment, step S1 may specifically include steps S11 and S12. In step S11, a first CCD visual device performs visual position identification on the m×n first electrode sheets 101 and performs position correction based on the result of the visual position identification, and in step S12, a second CCD visual device performs visual position identification on the m×n second electrode sheets 102 and performs position correction based on the result of the visual position identification.

[0026] Specifically, the first CCD visual device is disposed above the first correction stage 21, which includes m×n UVW stages arranged in m rows and n columns. The first CCD visual device captures images of the first electrode sheets 101 on the m×n UVW stages, performs visual analysis, obtains visual analysis results on whether correction is required and the correction values, transmits the visual analysis results to the UVW stage corresponding to the first electrode sheet 101 that requires correction, and further performs correction based on the correction values given by the UVW stage from the visual analysis results, and finally ensures that the first electrode sheets 101 are arranged in m rows and n columns, and that a certain gap is maintained between adjacent first electrode sheets 101. Similarly, the second CCD vision device is arranged above the second correction stage 22, which includes m×n UVW stages arranged in m rows and n columns. The second CCD vision device takes images of the second electrode sheets 102 on the m×n UVW stages and performs visual analysis to obtain visual analysis results on whether correction is required and the correction values. The visual analysis results are transmitted to the UVW stages corresponding to the second electrode sheets 102 that require correction, and the UVW stages then perform correction based on the correction values given by the visual analysis results, ultimately ensuring that the second electrode sheets 102 are arranged in m rows and n columns and that a certain gap is maintained between adjacent second electrode sheets 102.

[0027] The UVW stage not only corrects the position of the electrode sheet, but also corrects the orientation of the tabs when placing the electrode sheet. The tab position varies depending on the type of lithium-ion battery. Therefore, when performing visual analysis, the CCD vision device also analyzes the orientation of the tabs on the electrode sheet. If the tab orientation is incorrect, the UVW stage will correct the position to ensure the tab position is accurate.

[0028] Referring to FIG. 2 , in one embodiment, the tabs of the first electrode sheet 101 are all oriented in a first direction, and the tabs of the second electrode sheet 102 are all oriented in a second direction, where the first direction and the second direction are opposite. Specifically, the positive and negative electrode tabs of this type of lithium-ion battery are located on both sides of the electrode sheet, respectively, so that the tabs of the first electrode sheet 101 and the tabs of the second electrode sheet 102 are oriented in opposite directions. If the tabs of the first electrode sheet 101 or the second electrode sheet 102 are oriented in the same direction, the incorrectly oriented electrode sheet is rotated 180° by a UVW stage to ensure that the orientations of the tabs are opposite.

[0029] Referring to FIG. 1 , in another embodiment, the tabs of the first electrode sheet 101 in the mth row and the tabs of the second electrode sheet 102 in the mth row both face a first direction, and the tabs of the first electrode sheet 101 in the (m+1)th row and the tabs of the second electrode sheet 102 in the (m+1)th row both face a second direction, where the first direction and the second direction are opposite. Specifically, the tabs of the positive and negative electrodes of such a lithium-ion battery are both located on the same side of the electrode sheet, and therefore the tabs of the first electrode sheet 101 and the tabs of the second electrode sheet 102 face in the same direction. If the tabs of the first electrode sheet 101 or the second electrode sheet 102 face in opposite directions, the incorrectly oriented electrode sheet is rotated 180° using a UVW stage to ensure that the orientations of both tabs are the same. When there are m rows of first electrode sheets 101 and second electrode sheets 102, the tabs of the m-th row of first electrode sheets 101 and second electrode sheets 102 and the tabs of the (m+1)-th row of first electrode sheets 101 and second electrode sheets 102 are opposite in orientation to those of the (m+1)-th row of first electrode sheets 101 and second electrode sheets 102. For example, if the first and second tabs of the first row are both facing upward, the first and second tabs of the second row are both required to face downward. Thus, the tabs of the electrode sheets of the first row and the second row are opposite in orientation to each other, leaving a space between the lower edge of the electrode sheets of the first row and the upper edge of the electrode sheets of the second row. Thus, when cutting, the slitting device does not cut all the way to the tabs, which prevents interference with the cutting by the tabs and ensures the reliability of the cut battery cells.

[0030] Furthermore, step S11 specifically includes the following steps S111 to S114: in S111, a first CCD visual device photographs m×n sheets of the first electrode sheet 101 to obtain a first image; in S112, visual position determination is performed on the first image to obtain the coordinates of each of the first electrode sheets 101; in S113, it is determined whether the first electrode sheet 101 is in the correct position based on the coordinates of each of the first electrode sheets 101 and the reference position determination coordinates corresponding to the first electrode sheet 101; and in S114, if the first electrode sheet 101 is not in the correct position, a position correction is performed on the first electrode sheet 101. Specifically, first, the first CCD visual device photographs a first image, which includes each of the first electrode sheets 101, and the coordinates D of each of the first electrode sheets 101 are obtained using an image segmentation or feature extraction method. m,n (x, y, z) is obtained, where m and n represent the row and column of the electrode sheet, x represents the horizontal coordinate, y represents the vertical coordinate, and z represents the vertical coordinate. All the first electrode sheets 101 may share one coordinate system, or an independent coordinate system may be established for each first electrode sheet 101. After obtaining the coordinates of each first electrode sheet 101, the coordinates of each first electrode sheet 101 are further converted into the reference position specifying coordinates D corresponding to the first electrode sheet 101. m,n The position of the first electrode sheet 101 is compared with (x', y', z') to determine whether it is correct. If it is correct, no correction is necessary, but if it is incorrect, correction is required.

[0031] Specifically, the correction process is as follows: m,n (x,y,z) and D m,nA correction value is obtained by calculating the difference between the two based on (x', y', z'), and the correction value is sent to the UVW stage, which then performs position correction on the first electrode sheet 101 based on the correction value, so that the first electrode sheet 101 is finally positioned accurately. For example, the correction values are xx' = -1.5, yy' = 1.5, zz' = 0, and the UVW stage adjusts the position of the first electrode sheet 101 so that xx' = 0, yy' = 0, zz' = 0.

[0032] Furthermore, step S113 may specifically include the following steps S1131 to S1134. In S1131, it is determined whether the coordinates of the first electrode sheet 101 and the reference position identification coordinates corresponding to the first electrode sheet 101 are within a predetermined error range; in S1132, it is determined whether the left-right spacing distance between two horizontally adjacent first electrode sheets 101 is within a predetermined left-right spacing distance range; in S1133, it is determined whether the up-down spacing distance between two vertically adjacent first electrode sheets 101 is within a predetermined up-down spacing distance range; and in S1134, if the difference value between the coordinates of the first electrode sheet 101 and the reference position identification coordinates corresponding to the first electrode sheet 101 is within the predetermined error range, and the left-right spacing distance between the two horizontally adjacent first electrode sheets 101 is within the predetermined left-right spacing distance range and the up-down spacing distance between the two vertically adjacent first electrode sheets 101 is within the predetermined up-down spacing distance range, it is determined that the first electrode sheet 101 is in the correct position.

[0033] Specifically, in this embodiment, in order to determine whether the first electrode sheet 101 is in the correct position, three conditions must be met: whether the coordinates of the first electrode sheet 101 and the reference position identification coordinates corresponding to the first electrode sheet 101 are within a predetermined error range; whether the left-right spacing distance between two adjacent first electrode sheets 101 on the left and right is within a predetermined left-right spacing distance range; and whether the vertical spacing distance between two adjacent first electrode sheets 101 on the top and bottom is within a predetermined vertical spacing distance range.If all three conditions are met simultaneously, it can be determined that the first electrode sheet 101 is in the correct position.

[0034] Specifically, first, the first condition is judged, i.e., the standard judgment is performed, and if the standard judgment satisfies the requirement, the subsequent judgment is performed, and if the standard judgment does not satisfy the requirement, the correction step is performed, and there is no need to judge the remaining two conditions, thereby saving computational resources. m,n (x,y,z) and D m,n The difference value between (x', y', z') is calculated, and it is determined whether the difference value is within a predetermined error range. If so, the condition is considered to be met; if not, the condition is not met. The predetermined error range is preset, for example (xx'<±0.5, yy'<±0.5, zz'=0). Naturally, other values may be used, and are not limited thereto. In a specific implementation, the geometric center coordinates of the first electrode sheet 101 are obtained, and reference position identifying coordinates corresponding to the geometric center coordinates are obtained. The difference value between the geometric center coordinates and the corresponding reference position identifying coordinates is calculated. If the difference value is within the predetermined error range, it is determined that the difference value between the coordinates of the first electrode sheet 101 and the reference position identifying coordinates corresponding to the first electrode sheet 101 is within the predetermined error range. By selecting the geometric center coordinates corresponding to the geometric center of the first electrode sheet 101 and calculating the difference value, only one coordinate is selected and calculated, rather than the need to calculate the difference values of multiple coordinates, thereby saving computational resources and improving correction efficiency.

[0035] Next, the second condition is determined, that is, a left-right spacing determination is performed to determine whether the gap between two horizontally adjacent first electrode sheets 101 is within a predetermined left-right spacing distance range. In a specific implementation, the coordinates of the lower right corner of the target first electrode sheet 101 are obtained, the coordinates of the lower left corner of the first electrode sheet 101 located to the right of the target first electrode sheet 101 are obtained, the left-right spacing distance between the lower right corner coordinate and the lower left corner coordinate is calculated, and if the left-right spacing distance is within the predetermined left-right spacing distance range, it is determined that the left-right spacing distance between the two horizontally adjacent first electrode sheets 101 is within the predetermined left-right spacing distance range. Specifically, the target first electrode sheet 101 is the first electrode sheet 101 located on the left side of the two horizontally adjacent first electrode sheets 101, and this left first electrode sheet 101 is selected as the target electrode sheet. Next, the coordinates of the lower right corner D of the left first electrode sheet 101 are obtained. m,n (x 右下隅 ,y 右下隅 ,z 右下隅 ) and the coordinates D of the bottom left corner of the first electrode sheet 101 on the right side m,n+1 (x 左下隅 ,y 左下隅 ,z 左下隅 ) and calculate the left-right distance between them, that is, x 左下隅 -x 右下隅 is calculated, and it is determined whether the left-right distance is within a predetermined left-right distance range. If the left-right distance range is within the predetermined left-right distance range, |4| <x 左下隅 -x 右下隅<|5|, and of course, other values are also acceptable and are not limited thereto. Because the coordinate of the lower right corner is located on the right side of the left-side first electrode sheet 101 and the coordinate of the lower left corner is located on the left side of the right-side first electrode sheet 101, the horizontal coordinate difference between the coordinates of the lower right corner and the coordinate of the lower left corner can represent the horizontal spacing between the two first electrode sheets 101. Therefore, the coordinates of the lower left and right corners of two adjacent first electrode sheets 101 are selected for calculation, and only one coordinate is selected for each first electrode sheet 101, eliminating the need to calculate multiple coordinate differences, thereby saving computational resources and improving correction efficiency. Of course, in other embodiments, other coordinates of the right side of the left-side first electrode sheet 101 and other coordinates of the left side of the right-side first electrode sheet 101 may be selected for calculation to determine the horizontal spacing.

[0036] Finally, the third condition is determined, i.e., the vertical spacing determination is performed to determine whether the gap between two vertically adjacent first electrode sheets 101 is within a predetermined vertical spacing distance range. In a specific implementation, the coordinates of the lower right corner of the target first electrode sheet 101 are obtained, the coordinates of the upper right corner of the first electrode sheet 101 located below the target first electrode sheet 101 are obtained, the vertical spacing distance between the lower right corner coordinate and the upper right corner coordinate is calculated, and if the vertical spacing distance is within the predetermined vertical spacing distance range, it is determined that the vertical spacing distance between the two vertically adjacent first electrode sheets 101 is within the predetermined vertical spacing distance range. Specifically, the target first electrode sheet 101 is the first electrode sheet 101 located at the upper position of the two vertically adjacent first electrode sheets 101, and this upper first electrode sheet 101 is selected as the target electrode sheet. Next, the coordinates of the lower right corner D of the upper first electrode sheet 101 are obtained. m,n (x 右下隅 ,y 右下隅 ,z 右下隅 ) and the upper right corner coordinate D of the lower first electrode sheet 101 m,n+1 (x 右上隅 ,y 右上隅 ,z 右上隅 ) and calculate the vertical distance between them, i.e., y 右下隅 -y右上隅 is calculated, and it is determined whether the vertical interval distance is within a predetermined vertical interval distance range. If the vertical interval distance is within the predetermined vertical interval distance range, |4| <y 右下隅 -y 右上隅 <|5|, and of course, other values are also acceptable and are not limited thereto. Because the lower right corner coordinate is located on the lower edge of the upper first electrode sheet 101 and the upper right corner coordinate is located on the upper edge of the lower first electrode sheet 101, the vertical coordinate difference between the lower right corner coordinate and the upper right corner coordinate can represent the vertical spacing between the two first electrode sheets 101. Therefore, the calculation is performed by selecting the coordinates of the upper right corners and the lower right corners of two adjacent first electrode sheets 101, and only one coordinate is selected and calculated for each first electrode sheet 101, eliminating the need to calculate multiple coordinate differences, thereby saving computational resources and improving correction efficiency. Of course, in other embodiments, other coordinates on the lower edge of the upper first electrode sheet 101 and other coordinates on the upper edge of the lower first electrode sheet 101 may be selected and calculated to determine the vertical spacing.

[0037] In addition, in a scene where m is two or more rows, the coordinate of the lower right corner of the target first electrode sheet 101 in the first row, i.e., the coordinate of the lower right corner of the upper first electrode sheet 101, has already been acquired in the process of executing the left-right interval determination. In other words, the coordinate of the lower right corner of the upper first electrode sheet 101 acquired under condition 3 is the coordinate of the lower right corner of the left first electrode sheet 101 acquired under condition 2. In other words, the coordinate of the lower right corner of the target first electrode sheet 101 acquired in the left-right interval determination and the up-down interval determination are the same, and both are D m,n (x 右下隅 ,y 右下隅 ,z 右下隅 ) In this way, there is no need to re-acquire the vertical distance when determining the vertical distance, and calculation can be performed using the same coordinates, saving calculation resources and improving correction efficiency.

[0038] Judging the three conditions, it is ensured that the first electrode sheet 101 is in an accurate position, and that there are certain gaps on the top, bottom, left and right sides, leaving cutting space for the slitting device.

[0039] Similarly, the correction step of the second electrode sheet 102 is the same in principle as the correction step of the first electrode sheet 101, i.e., step S12 is the same as the process of step S11, and for the sake of brevity of the specification, redundant explanations of the principles and processes of S12 will be omitted here.

[0040] In S2, the separator assembly 4 covers the sheet stacking table 3 with the first separator 41.

[0041] In this embodiment, the separator assembly 4 first covers the first layer of separator 41 on the sheet stacking table 3, and the first layer of separator 41 is positioned above the sheet stacking table 3, and then sheet stacking begins from the first layer of separator 41.

[0042] In S3, the first robot arm simultaneously grabs the m x n first electrode sheets 101 corrected from the first position correction stage, and simultaneously places the m x n first electrode sheets 101 in m rows and n columns on the first layer of separator 41 on the same sheet stacking table 3.

[0043] In this embodiment, after the first layer of separators 41 is coated on the sheet stacking table 3, the first robot arm moves to the first correction stage 21 and simultaneously grabs the m×n first electrode sheets 101 arranged in the corrected m rows and n columns, and then transports them to the sheet stacking table 3. The first robot arm uses suction to grab and place the first electrode sheets 101. Even during transportation, the first electrode sheets 101 are sucked by the suction unit 52 of the first robot arm in the m rows and n columns arrangement, and the m rows and n columns arrangement is always maintained. Next, the first robot arm moves above the sheet stacking table 3, releases the suction force, and simultaneously places the m rows and n columns of first electrode sheets 101 on the first layer of separators 41 on the sheet stacking table 3. In this way, placing multiple first electrode sheets 101 simultaneously on the same sheet stacking table 3 significantly improves the efficiency of sheet stacking compared to conventional sheet stacking machines, which place only one electrode sheet on the sheet stacking table 3 at a time.

[0044] In S4, the separator assembly 4 covers the m×n first electrode sheets 101 with the second separator 41.

[0045] In this embodiment, after the first electrode sheet 101 is laminated on the first layer of separator 41, the second layer of separator 41 is further covered by the separator assembly 4, the second layer of separator 41 is covered above the first electrode sheet 101, the second layer of separator 41 covers m × n first electrode sheets 101 at a time, and then the second layer of electrode sheet 102 is laminated on top of the second layer of separator 41, and the second layer of separator 41 separates and insulates the first electrode sheet 101 and the second electrode sheet 102. As a result, this embodiment improves coating efficiency by using a coating process in which multiple electrode sheets are covered at once using separator 41.

[0046] In S5, the second robot arm simultaneously grabs the m×n second electrode sheets 102 corrected from the second position correction stage, and simultaneously places the m×n second electrode sheets 102 in m rows and n columns on the second layer of separators 41 on the same sheet stacking table 3, thereby completing one sheet stacking of the first electrode sheets 101 and the second electrode sheets 102.

[0047] In this embodiment, after the second layer of separators 41 is coated on the sheet stacking table 3, the second robot arm moves to the second correction stage 22 and simultaneously grabs the m × n second electrode sheets 101 arranged in the corrected m rows and n columns, and then transports them to the sheet stacking table 3. The second robot arm then uses suction to grab and place the second electrode sheets 102. During transportation, the second electrode sheets 102 are attracted to the suction unit 52 of the second robot arm in an m rows and n columns arrangement, and the m rows and n columns arrangement is always maintained. The second robot arm then moves above the sheet stacking table 3, releases the suction force, and simultaneously places the m rows and n columns of second electrode sheets 102 on the sheet stacking table 3. In this way, placing multiple second electrode sheets 102 simultaneously on the same sheet stacking table 3 significantly improves the efficiency of sheet stacking compared to conventional sheet stacking machines, which place only one electrode sheet on the sheet stacking table 3 at a time. Here, one of the first electrode sheet 101 and the second electrode sheet 102 is a positive electrode sheet and the other is a negative electrode sheet. Either the positive electrode sheet or the negative electrode sheet may be stacked first; this is not limited here. After stacking, the first electrode sheet 101 and the second electrode sheet 102 above and below the separator 41 overlap, thereby completing one sheet stacking operation.

[0048] As shown in FIG. 2, exemplarily, the m rows and n columns may be 1 row and 5 columns, ie, five electrode sheets spaced apart in parallel in the horizontal direction.

[0049] As shown in FIG. 1, exemplarily, the m rows and n columns may be two rows and three columns, i.e., divided into two rows, with three electrode sheets spaced apart in parallel in each row, for a total of six electrode sheets.

[0050] In S6, the sheet stacking step of the first electrode sheet 101 and the second electrode sheet 102 is repeatedly performed until a preset stopping condition is met, thereby obtaining a sheet stack unit.

[0051] In this embodiment, after the second electrode sheet 102 is stacked on the second layer of separator 41, the third layer of separator 41 is further covered by the separator assembly 4, the third layer of separator 41 is covered on top of the second electrode sheet 102, the third layer of separator 41 covers m × n second electrode sheets 102 at a time, and then the first electrode sheet 101 is stacked on top of the third layer of separator 41, that is, steps S3 to S5 are performed again, that is, the separator 41 is folded into a Z shape by the reciprocating movement of the separator assembly 4, and the first electrode sheet 101 and the second electrode sheet 102 are alternately placed between the folded separators 41 by the first robot arm and the second robot arm, and the first electrode sheet 101 and the second electrode sheet 102 are separated by the separator 41, and the above process is repeated multiple times until a preset stopping condition is reached, and a sheet stacking unit is finally obtained. Here, the predetermined stopping condition may be, but is not limited to, that the number of separator 41 layers reaches a target number, that the number of sheet stackings reaches a target number, that the stacking time reaches a target time, or that the stack thickness reaches a target thickness. The sheet stacking unit is composed of multiple sheet stacks, and in this embodiment, the sheet stacking unit is composed of m x n sheet stacks. After obtaining the sheet stacking unit, the entire sheet stacking unit is further charged. In this way, multiple stacks are charged simultaneously, improving charging efficiency and reducing charging costs.

[0052] In the method for stacking electrode sheets for a battery cell of this embodiment, compared to the conventional stacking method in which pre-die-cut positive and negative electrode sheets and separators 41 are stacked one by one from bottom to top, the method of this embodiment allows multiple electrode sheets to be placed in parallel on the same sheet stacking table 3 at the same time, or multiple electrode sheets to be placed in both horizontal and vertical directions at the same time, allowing for high-speed sheet stacking, thereby significantly improving sheet stacking efficiency.

[0053] In another embodiment, as shown in FIG. 9 , the method for stacking electrode sheets for a battery cell includes steps S1 to S6 and further includes, after step S6, step S7, in which a slitting device is used to cut the separator 41 of the sheet stacking unit to obtain multiple sheet stacks. Specifically, the slitting device separates the sheet stack along slit lines, which include vertical and horizontal slit lines extending along the longitudinal and lateral directions of the sheet stacking unit, respectively. Specifically, the vertical slit line is provided between two adjacent electrode sheets on the left and right, and the horizontal slit line is provided between two adjacent electrode sheets on the top and bottom. The slitting device cuts along the vertical and horizontal slit lines to ultimately obtain m × n sheet stacks, which are then packaged to obtain battery cells. In this way, by stacking multiple electrode sheets at once according to their longitudinal and lateral distribution and then die-cutting them using the slitting device to obtain multiple sheet stacks, multiple battery cells can be manufactured simultaneously, significantly improving battery cell production efficiency.

[0054] In other embodiments, the number of sheet stacking tables 3 is not limited to one, but may be any natural number greater than one. For example, two sheet stacking tables 3, a first sheet stacking table and a second sheet stacking table, may be stacked simultaneously. Specifically, the overall steps are similar to S1 to S6, but there is a difference in the transport steps of the two robot arms. Specifically, the first robot arm transports the first electrode sheet 101 to the first sheet stacking table while the second robot arm transports the second electrode sheet 102 to the second sheet stacking table. Similarly, the first robot arm transports the first electrode sheet 101 to the second sheet stacking table while the second robot arm transports the second electrode sheet 102 to the first sheet stacking table. In this way, both robot arms are in operation at all times and are not stopped and waiting. When there is only one sheet stacking table 3, the first robot arm places the first sheet stack while the second robot arm is in a standby state, or the second robot arm places the second sheet stack while the first robot arm is in a standby state. Using two robot arms to simultaneously stack electrode sheets on the two sheet stacking tables 3 eliminates the need for stopping the two robot arms, reducing the time spent waiting and further improving the sheet stacking speed and efficiency. In this embodiment, the two sheet stacking tables 3 are both located between the first and second correction stages 21 and 22. The two sheet stacking tables 3 are spaced apart vertically at an angle in a plan view. Thus, the two sheet stacking tables 3 are not aligned on the same line as the first and second correction stages 21 and 22, but are offset by a certain distance. In this case, the moving stages corresponding to the two robot arms can be installed as a horizontal rotation mechanism, and after the correction stage grasps the electrode sheet, it rotates horizontally to place the electrode sheet on the sheet stacking table 3, and transports the electrode sheet by the horizontal rotation method, thereby reducing the movement stroke and improving the transport efficiency.

[0055] (Addendum) (Appendix 1) a step in which a first robot arm simultaneously grabs m×n first electrode sheets from a first transport assembly and places them on a first position correction stage for position correction, and a second robot arm simultaneously grabs m×n second electrode sheets from a second transport assembly and places them on a second position correction stage for position correction, where m is a positive integer equal to or greater than 1 and n is a positive integer equal to or greater than 2; A step in which a separator assembly coats a first layer of separator on a sheet stacking base; the first robot arm simultaneously picking up the m×n first electrode sheets corrected from the first position correction stage, and simultaneously placing the m×n first electrode sheets in m rows and n columns on a first layer of separator on the same sheet stacking table; a separator assembly coating a second layer of separator onto the m×n first electrode sheets; the second robot arm simultaneously picking up the m×n second electrode sheets corrected from the second position correction stage, and simultaneously placing the m×n second electrode sheets in m rows and n columns on a second layer of separator on the same sheet stacking table, thereby completing one sheet stacking of the first electrode sheets and the second electrode sheets; and a step of repeatedly performing the sheet stacking step of the first electrode sheet and the second electrode sheet until a preset stopping condition is reached, thereby obtaining a sheet stacking unit.

[0056] (Appendix 2) The position correction step includes: performing visual localization on the m×n first electrode sheets by a first CCD visual device, and performing position correction based on the results of the visual localization; The method described in Appendix 1, characterized in that it includes a step of performing visual position determination on the m x n second electrode sheets using a second CCD visual device and performing position correction based on the results of the visual position determination.

[0057] (Appendix 3) the tabs of the first electrode sheet are all oriented in a first direction and the tabs of the second electrode sheet are all oriented in a second direction, wherein the first direction and the second direction are opposite; or The method described in Appendix 1, wherein the tab of the first electrode sheet in the mth row and the tab of the second electrode sheet in the mth row both face a first direction, and the tab of the first electrode sheet in the (m+1)th row and the tab of the second electrode sheet in the (m+1)th row both face a second direction, and the first direction and the second direction are opposite to each other.

[0058] (Appendix 4) The method described in Appendix 1, characterized in that the first robot arm and the second robot arm use a suction method to grasp and place the first electrode sheet and the second electrode sheet.

[0059] (Appendix 5) Arranging m×n first electrode sheets in m rows and n columns, suctioning them onto the first transport assembly, and transporting them to the side of the first position correction stage by the first transport assembly; The method described in Appendix 1, further comprising the steps of arranging m×n second electrode sheets in m rows and n columns, adsorbing them onto the second transport assembly, and transporting them near the second position correction stage by the second transport assembly.

[0060] (Appendix 6) The method of claim 1, further comprising the step of cutting the separator of the sheet stacking unit with a slitting device to obtain a plurality of sheet stacks.

[0061] (Appendix 7) 7. A stacking device for electrode sheets of a battery cell applicable to the method according to any one of Supplementary Notes 1 to 6, comprising: a first transport assembly for transporting a first electrode sheet; a second transport assembly for transporting a second electrode sheet; a first correction stage for correcting the position of the first electrode sheet; a second correction stage for correcting the position of the second electrode sheet; a sheet stacking table; a first robot arm; a second robot arm; and a separator assembly for coating, wherein the first correction stage and the second correction stage are provided on both sides of the sheet stacking table, respectively; and the first transport assembly is configured to transport the separator assembly of the first correction stage. the first robot arm is used to simultaneously grasp and place a plurality of the first electrode sheets and transport the first electrode sheets by reciprocating between the first transport assembly, the first correction stage, and the sheet stacking table; and the second robot arm is used to simultaneously grasp and place a plurality of the second electrode sheets and transport the second electrode sheets by reciprocating between the second transport assembly, the second correction stage, and the sheet stacking table.

[0062] (Appendix 8) 8. The battery cell electrode sheet stacking device according to claim 7, wherein a first CCD visual device is provided above the first correction stage, and a second CCD visual device is provided above the second correction stage.

[0063] (Appendix 9) The battery cell electrode sheet stacking device described in Appendix 7, characterized in that the first robot arm and the second robot arm each include a holder and n suction units connected to the holder, the n suction units being arranged in parallel in the horizontal direction at intervals, and n being a positive integer greater than or equal to 2.

[0064] (Appendix 10) The battery cell electrode sheet stacking device described in Appendix 7, characterized in that the first robot arm and the second robot arm each include a holder and m×n suction units connected to the holder, the suction units are arranged at intervals in m rows and n columns, m is a positive integer greater than or equal to 1, and n is a positive integer greater than or equal to 2.

Claims

1. a step in which a first robot arm simultaneously grabs m×n first electrode sheets from a first transport assembly and places them on a first position correction stage for position correction, and a second robot arm simultaneously grabs m×n second electrode sheets from a second transport assembly and places them on a second position correction stage for position correction, where m is a positive integer equal to or greater than 1 and n is a positive integer equal to or greater than 2; A separator assembly is used to coat a first layer of separator onto a sheet stacking base; the first robot arm simultaneously picking up the m×n first electrode sheets corrected from the first position correction stage, and simultaneously placing the m×n first electrode sheets in m rows and n columns on a first layer of separator on the same sheet stacking table; a separator assembly coating a second layer of separator onto the m×n first electrode sheets; the second robot arm simultaneously picking up the m×n second electrode sheets corrected from the second position correction stage, and simultaneously placing the m×n second electrode sheets in m rows and n columns on a second layer of separator on the same sheet stacking table, thereby completing one sheet stacking of the first electrode sheets and the second electrode sheets; and a step of repeatedly performing the sheet stacking step of the first electrode sheet and the second electrode sheet until a preset stopping condition is reached, thereby obtaining a sheet stacking unit.

2. The position correction step includes: performing visual localization on the m×n first electrode sheets by a first CCD visual device, and performing position correction based on the results of the visual localization; 2. The method of claim 1, further comprising the step of: performing visual localization on the m×n second electrode sheets with a second CCD vision device; and performing position correction based on the results of the visual localization.

3. the tabs of the first electroded sheet are all oriented in a first direction and the tabs of the second electroded sheet are all oriented in a second direction, wherein the first direction and the second direction are opposite; or 2. The method of claim 1, wherein the tabs of the first electrode sheet in the mth row and the tabs of the second electrode sheet in the mth row both face a first direction, and the tabs of the first electrode sheet in the (m+1)th row and the tabs of the second electrode sheet in the (m+1)th row both face a second direction, and the first direction and the second direction are opposite to each other.

4. 2. The method of claim 1, wherein the first robot arm and the second robot arm use suction to grasp and place the first electrode sheet and the second electrode sheet.

5. Arranging m×n first electrode sheets in m rows and n columns, suctioning them onto the first transport assembly, and transporting them to the side of the first position correction stage by the first transport assembly; 2. The method of claim 1, further comprising the steps of: arranging m×n second electrode sheets in m rows and n columns, adsorbing them onto the second transport assembly, and transporting them by the second transport assembly to the side of the second position correction stage.

6. The method according to claim 1, further comprising the step of cutting the separator of the sheet stack unit with a slitting device to obtain a plurality of sheet stacks.

7. 7. A stacking device for electrode sheets of a battery cell applicable to the method according to claim 1, comprising: a first transport assembly for transporting a first electrode sheet; a second transport assembly for transporting a second electrode sheet; a first correction stage for correcting the position of the first electrode sheet; a second correction stage for correcting the position of the second electrode sheet; a sheet stacking table; a first robot arm; a second robot arm; and a separator assembly for coating, wherein the first correction stage and the second correction stage are provided on both sides of the sheet stacking table, respectively, and the first transport assembly is configured to transport the separator assembly of the first correction stage. the first robot arm is used to simultaneously grasp and place a plurality of the first electrode sheets and transport the first electrode sheets by reciprocating between the first transport assembly, the first correction stage, and the sheet stacking table; and the second robot arm is used to simultaneously grasp and place a plurality of the second electrode sheets and transport the second electrode sheets by reciprocating between the second transport assembly, the second correction stage, and the sheet stacking table.

8. 8. The battery cell electrode sheet stacking device according to claim 7, wherein a first CCD visual device is provided above the first correction stage, and a second CCD visual device is provided above the second correction stage.

9. 8. The battery cell electrode sheet stacking device according to claim 7, wherein the first robot arm and the second robot arm each include a holder and n suction units connected to the holder, the n suction units being arranged in parallel in the horizontal direction at intervals, and n being a positive integer greater than or equal to 2.

10. 8. The battery cell electrode sheet stacking device according to claim 7, wherein the first robot arm and the second robot arm each include a holder and m×n suction units connected to the holder, the suction units are spaced apart in m rows and n columns, m is a positive integer greater than or equal to 1, and n is a positive integer greater than or equal to 2.

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