Laser welding system, laser welding method, battery production system, storage medium

Abstract

The application discloses a laser welding system, a laser welding method, a battery production system and a storage medium. The laser welding method comprises the following steps: obtaining a first coordinate of a target electrode terminal based on a coordinate system perpendicular to a plane of a pressing direction of a pressing unit; calculating a deviation between the first coordinate and a preset first coordinate in a first calculation mode to determine an offset of a preset pressing position of a pressing nozzle relative to the target electrode terminal, according to the number of battery monomers in the same row being greater than an upper limit value of a first preset number; calculating the deviation in a second calculation mode to determine the offset, according to the number of battery monomers in the same row being within a range of the first preset number; and adjusting a relative position of the pressing nozzle and the target electrode terminal according to the offset. By obtaining the first coordinate and the preset first coordinate, calculating the offset of the two, and adjusting the position of the pressing nozzle relative to the target electrode terminal according to the offset, the possibility of laser irradiation to the pressing nozzle to cause a missed welding in a welding process is reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a laser welding system, a laser welding method, a battery production system, and a storage medium. Background Technology

[0002] In the battery production process, one of the battery assembly steps is to weld the electrode terminals of multiple battery cells to the busbar to achieve series and parallel connection between battery cells, thereby meeting the battery's power output requirements.

[0003] In related technologies, incomplete soldering between electrode terminals and busbars reduces the yield rate of batteries. Summary of the Invention

[0004] In view of the above problems, this application provides a laser welding system, a laser welding method, a battery production system, and a storage medium. The offset of the nozzle is determined according to a first coordinate and a preset first coordinate, and the position of the nozzle relative to the target electrode terminal is adjusted. This can reduce the possibility that the laser cannot weld the busbar and the electrode terminal due to excessive nozzle offset during the welding process, thereby improving the reliability of welding.

[0005] In a first aspect, this application provides a laser welding method for use in a laser welding system, the laser welding system including a pressing unit, the pressing unit including at least one pressing nozzle, the pressing nozzle being used to press a busbar onto a target electrode terminal of a battery cell, the laser welding method including:

[0006] The first coordinates of the target electrode terminal are obtained based on the first coordinate system, wherein the pressing direction of the pressing unit is perpendicular to the first coordinate system;

[0007] Based on the fact that the number of battery cells in the same row is greater than the upper limit of the first preset number, the deviation between the first coordinate and the preset first coordinate is calculated using the first calculation method to determine the offset of the preset pressing position of the nozzle relative to the target electrode terminal.

[0008] Based on the number of battery cells in the same row within a first preset quantity range, the deviation between the first coordinate and the preset first coordinate is calculated using a second calculation method to determine the offset of the preset pressing position of the nozzle relative to the target electrode terminal.

[0009] Adjust the relative position of the nozzle and the target electrode terminal according to the offset.

[0010] When multiple battery cells are grouped together, the center of the electrode terminal of each battery cell may deviate from the center of the nozzle. Due to the cumulative deviation, the laser may irradiate the nozzle with a larger offset relative to the electrode terminal during welding, causing incomplete welding of the busbar and electrode terminal. This application obtains a first coordinate and a preset first coordinate, calculates the offset between the two, and adjusts the position of the nozzle relative to the electrode terminal according to the offset to reduce the possibility of incomplete welding caused by the laser irradiating the nozzle during welding, thereby improving the reliability of welding. In addition, different deviation calculation methods are used to determine the offset for different ranges of the number of battery cells in the same row, so that the laser welding method can be adapted to the welding needs of battery cells with different group sizes. It can cover multiple production scenarios without changing the welding equipment, improving the versatility and adaptability of the laser welding system.

[0011] In some embodiments, the pressing unit includes a plurality of pressure nozzles arranged along a first direction, which intersects the height direction of the pressing unit. Along the first direction, the maximum distance between the two outermost pressure nozzles is set within a preset value. Based on the number of battery cells in the same row, which is outside a first preset range, a deviation is calculated using a first calculation method to determine the offset, including:

[0012] Obtain the first coordinate of each target electrode terminal corresponding to each nozzle;

[0013] The average value of the multiple first coordinates is obtained to get the average coordinate. The offset is determined based on the deviation between the average coordinate and the preset average coordinate.

[0014] By calculating the deviation value using an average value, the entire pressing unit can be adjusted. Setting preset values ​​allows for further control of the cumulative deviation of the nozzles relative to the target electrode terminal, reducing the possibility of individual nozzles exceeding the allowable range for laser welding due to adjustments made based on the average deviation value. Furthermore, the deviation between the average coordinates and preset average coordinates allows for overall adjustment of the nozzles in the pressing unit, eliminating the need for individual adjustments to each nozzle's position relative to the target electrode terminal. Adjusting the entire pressing unit ensures that the alignment deviation of all nozzles and their corresponding target electrode terminals is controlled within a preset range. This method reduces the time and computation required for individual nozzle adjustments, thus improving the efficiency of the laser welding system.

[0015] In some embodiments, the first coordinate system is a rectangular coordinate system, and the calculated average coordinates are (X... , The first preset coordinate is set as the preset average coordinate, and the preset average coordinate is (X0, Y0).

[0016] Adjust the relative position of the nozzle and the target electrode terminal according to the offset, including:

[0017] According to X Offset relative to X0 and / or Adjust the relative position of the nozzle and the target electrode terminal by the offset relative to Y0.

[0018] Therefore, the offset direction and offset amount of each nozzle can be accurately calculated, and the nozzle can be easily adjusted according to the offset direction and offset amount to reduce the offset of the nozzle relative to the target electrode terminal.

[0019] In some embodiments, the pressure nozzle that the pressing unit needs to press down is a target pressure nozzle, and the number of target pressure nozzles is at least one. Based on the number of battery cells in the same row within a first preset range, a deviation is calculated using a second calculation method to determine the offset, including:

[0020] Calculate the deviation between the first coordinate and the preset first coordinate to determine the offset.

[0021] Therefore, the position of the pressure nozzle can be adjusted according to the actual offset between each pressure nozzle and the corresponding target electrode terminal, so that the pressure nozzle is as concentric as possible with the target electrode terminal, thereby reducing the possibility of the laser irradiating the pressure nozzle during the welding process and causing incomplete welding.

[0022] In some embodiments, the first coordinate system is a rectangular coordinate system, the first coordinate of the i-th nozzle is (Xi, Yi), the preset pressing coordinate of the i-th nozzle is (Xpi, Ypi), and the preset first coordinate of the i-th nozzle is (X0i, Y0i), where i is an integer greater than or equal to 1. Based on the deviation between the first coordinate and the preset first coordinate, the offset of the preset pressing position of the nozzle relative to the target electrode terminal is determined, including:

[0023] Calculate the difference between Xi and X0i and the difference between Yi and Y0i. Use the difference between Xi and X0i or the absolute value of the difference as the offset of Xpi, and the difference between Yi and Y0i or the absolute value of the difference as the offset of Ypi.

[0024] The offset is used to compensate for the pressure nozzles Xi and / or Yi, and the preset pressing position of the pressure nozzles is adjusted so that the pressure nozzles are as concentric as possible with the target electrode terminals, thereby reducing the possibility of the laser irradiating the pressure nozzles during the welding process and thus reducing the possibility of incomplete welding.

[0025] In some embodiments, adjusting the relative position of the nozzle and the target electrode terminal until the offset is within a preset deviation range includes:

[0026] Adjust the position of the pressing unit relative to the target electrode terminal according to the offset, so that all the nozzles of the pressing unit move relative to the target electrode terminal.

[0027] By adjusting the position of the pressure unit relative to the target electrode terminal, the time required to adjust each pressure nozzle individually can be reduced, thereby shortening the waiting time for welding the corresponding welding area of ​​each pressure unit and improving the working efficiency of the laser welding system.

[0028] In some embodiments, the number of pressing units is multiple and forms at least one row, and adjusting the relative position of the nozzle and the target electrode terminal according to the offset includes:

[0029] Based on the offset of the nozzle of each pressing unit relative to the target electrode terminal, the position of each pressing unit relative to the target electrode terminal is adjusted sequentially along the arrangement direction of the multiple pressing units.

[0030] This allows for the adjustment of the position of the nozzle of each pressing unit relative to the target electrode terminal, and direct adjustment of the pressing unit to move multiple nozzles as a whole reduces the time required to adjust each nozzle individually, thus improving work efficiency. Furthermore, it also improves the consistency of welding.

[0031] In some embodiments, the laser welding system further includes a laser capable of moving along the arrangement direction of the nozzles and capable of welding the busbar and the target electrode terminal; the welding method further includes:

[0032] After adjusting the position of the nozzle of each pressing unit relative to the target electrode terminal, control each pressing unit to move simultaneously so that the nozzle presses the manifold onto the target electrode terminal.

[0033] The laser is controlled to perform welding operations on the busbar and the target electrode terminal.

[0034] By controlling each pressing unit to move the nozzle and sequentially welding the target electrode terminal corresponding to the nozzle of each pressing unit, the waiting time required to control the pressing unit to press down the target electrode terminal for each welding can be reduced, which is beneficial to improving the working efficiency of the laser welding system.

[0035] In some embodiments, controlling the laser to perform welding operations on the busbar and the target electrode terminal includes:

[0036] Welding operations are performed after compensating the preset laser emission position based on the offset.

[0037] This reduces the likelihood of a large welding position offset caused by excessive deviation between the target electrode terminal and the preset pressing position, and also reduces the possibility of incomplete welding caused by large laser beam deviation irradiating the nozzle, thereby improving welding reliability.

[0038] In some embodiments, obtaining the first coordinates of the target electrode terminal and the preset pressure nozzle coordinates includes:

[0039] Obtain the coordinates of the center point of the target electrode terminal

[0040] The coordinates of the center point of the target electrode terminal are used as the first coordinates.

[0041] Therefore, the offset can be directly calculated and determined based on the coordinates of the center point of the target electrode terminal and the center point of the nozzle, which simplifies the offset calculation process and makes the calculation simpler and more accurate.

[0042] Secondly, this application provides a laser welding system, comprising:

[0043] The acquisition module is used to obtain the first coordinates of the target electrode terminal;

[0044] A pressing device includes a pressing unit and a driving component. The pressing unit includes at least one pressing nozzle for pressing a busbar onto a target electrode terminal of a battery cell. The driving component is drivenly connected to the pressing unit and is configured to drive the pressing unit to move relative to the target electrode terminal along a first direction, a second direction, and the height direction of the pressing unit. The first direction and the second direction intersect, and the plane containing the first direction and the second direction intersects with the height direction of the pressing unit.

[0045] The control device is communicatively connected to the acquisition module and the drive component, respectively. It is used to determine the offset of the preset pressing position of the nozzle relative to the target electrode terminal based on the deviation between the first coordinate and the preset first coordinate. It is also used to adjust the relative position of the nozzle and the target electrode terminal by the drive component based on the offset. Furthermore, it is used to move the nozzle relative to the target electrode terminal along the height direction by the drive component.

[0046] The acquisition module obtains the first coordinates, calculates the offset between the two through the control device, and controls the drive component to adjust the position of the pressure nozzle based on the offset, so as to reduce the possibility of laser irradiation on the pressure nozzle and causing incomplete welding during the welding process, thereby improving the reliability of welding.

[0047] In some embodiments, the driving component includes a plurality of driving units arranged along a first direction, each driving unit being connected to a pressing unit, and each driving unit being configured to individually drive the pressing unit to move relative to the target electrode terminal along the first direction.

[0048] Therefore, the position of the nozzle of each pressing unit relative to the target electrode terminal along the first direction can be adjusted individually according to the offset, so that the nozzles of multiple pressing units can be adjusted to simultaneously press multiple battery cells, thereby reducing the time required to perform pressing operations sequentially and improving operating efficiency.

[0049] In some embodiments, the pressing unit includes a first connecting member and a second connecting member. The first connecting member is fixedly connected to the driving part. The pressing unit also includes a driving adjustment member. The driving adjustment member is drivenly connected to the second connecting member. The driving adjustment member can drive the second connecting member to move relative to the first connecting member in a second direction.

[0050] The drive adjustment component is communicatively connected to the control device, which can adjust the position of the nozzle relative to the target electrode terminal along the second direction through the drive adjustment component.

[0051] Therefore, the position of the nozzle of each pressing unit relative to the target electrode terminal along the second direction can be adjusted individually according to the offset, so that the nozzles of multiple pressing units can be adjusted to simultaneously press multiple battery cells, thereby reducing the time required for sequential pressing operations and improving operating efficiency.

[0052] Thirdly, this application provides a battery production system, including the laser welding method of the first aspect or the laser welding system including the second aspect.

[0053] Since the battery production system includes all the technical features of the above welding methods or laser welding systems, and the effect is the same as described above, it will not be repeated here.

[0054] Fourthly, this application provides a storage medium for storing a computer program, wherein the computer program employs the laser welding method of the first aspect when it is executed.

[0055] Since the storage medium stores the computer program, the laser welding method used when the computer program runs has the same effect as described above, and will not be repeated here.

[0056] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0057] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0058] Figure 1 This is a structural diagram of an example of multiple battery cells to be welded.

[0059] Figure 2 andFigure 3 This is a logic block diagram of a laser welding method according to some embodiments of this application;

[0060] Figure 4 This is a structural diagram of another example of multiple battery cells to be welded;

[0061] Figure 5 This is a top view of a laser welding apparatus according to some embodiments of this application;

[0062] Figure 6 This is a partial isometric view of a laser welding apparatus according to some embodiments of this application;

[0063] Figure 7 This is an isometric view of a pressing unit in a laser welding apparatus according to some embodiments of this application;

[0064] Figure 8 and Figure 9 This is a structural block diagram of a laser welding apparatus according to some embodiments of this application.

[0065] The reference numerals in the detailed embodiments are as follows:

[0066] 100. Laser welding system;

[0067] 10. Acquisition module; 20. Control device; 30. Pressing device; 31. Drive component; 311. First drive component; 312. Second drive component; 313. Third drive component; 314. Frame; 32. Pressing unit; 321. First connecting member; 322. Second connecting member; 323. Pressing nozzle; 333. Drive adjustment component; 40. Welding component; 41. Laser; 42. Welding drive component;

[0068] 200. Battery cell; 210. Electrode terminal;

[0069] X, first direction; Y, second direction; Z, altitude direction. Detailed Implementation

[0070] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0073] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0075] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0076] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] In battery production, multiple battery cells are assembled into groups. A crimping nozzle is used to press the busbar onto the electrode terminals. A laser passes through the cavity of the crimping nozzle for welding. Please refer to [the documentation / reference needed]. Figure 1 The spacing between the electrode terminals of different battery cells is inconsistent, causing the center of the electrode terminal to be misaligned with the center of the nozzle. If the cumulative deviation is too large, the laser will irradiate the inner surface of the nozzle during welding, resulting in incomplete welding.

[0079] In view of this, this application provides a laser welding method, which obtains a first coordinate and a preset first coordinate, calculates the offset between the two, and adjusts the position of the pressure nozzle according to the offset to reduce the offset of the pressure nozzle relative to the electrode terminal, thereby reducing the possibility of laser irradiation on the pressure nozzle and causing incomplete welding during the welding process, and thus improving the reliability of welding.

[0080] This application provides a laser welding system that can be used for welding cylindrical or prismatic battery cells, but is not limited to that used for welding.

[0081] For ease of explanation, the following embodiments use a laser welding method from some embodiments of this application as an example.

[0082] Please refer to Figures 5-7 The laser welding system 100 includes a pressing unit 32, which includes at least one pressing nozzle 323 for pressing the busbar onto the target electrode terminal of the battery cell 200. The pressing nozzle 323 of the pressing unit 32 can be one or more in a row. Please refer to... Figure 2 Laser welding methods include:

[0083] The first coordinates of the target electrode terminal are obtained based on the first coordinate system, wherein the pressing direction of the pressing unit 32 is perpendicular to the first coordinate system;

[0084] Based on the first coordinate and the preset first coordinate, determine the offset of the preset pressing position of the nozzle 323 relative to the target electrode terminal;

[0085] Adjust the relative position of the nozzle 323 and the target electrode terminal according to the offset.

[0086] The target electrode terminal refers to the electrode terminal 210 that is clamped by the corresponding pressure nozzle 323 to hold the busbar.

[0087] The first coordinate can be the coordinate of the center point of the top of the target electrode terminal. When the center of the preset welding position does not coincide with the center point of the target electrode terminal, the preset first coordinate can also be determined based on the welding position.

[0088] Before adjusting the pressure nozzle 323, the pressure nozzle 323 may be in a preset pressing position or may not be in a preset pressing position. When the pressure nozzle is in the preset pressing position, the position of the pressure nozzle 323 relative to the target electrode terminal can be adjusted directly according to the offset before pressing. When the pressure nozzle 323 is not in the preset pressing position, the pressure nozzle 323 can be moved to the preset pressing position first, and then the pressure nozzle 323 can be compensated according to the offset before pressing.

[0089] The pressure nozzle 323 has preset pressure nozzle coordinates at a preset pressing position. These preset pressure nozzle coordinates correspond one-to-one with a preset first coordinate. That is, during laser welding, when the pressure nozzle 323 is at the preset pressing position and the target electrode terminal is at the preset first coordinate, the laser will not irradiate the pressure nozzle 323. In actual welding, there is a deviation between the actual coordinates (first coordinate) of the target electrode terminal and the preset first coordinate. If the pressure nozzle 323 is also pressed down according to the preset pressure nozzle coordinate, the laser may irradiate the pressure nozzle. Therefore, the preset pressing position can be supplemented according to the offset, i.e., the preset pressure nozzle coordinates can be compensated.

[0090] A busbar is a component used to electrically connect the target electrode terminals of two battery cells 200. Through the busbar, multiple battery cells 200 can be connected in series and / or in parallel.

[0091] The coordinate system can be a rectangular coordinate system, a polar coordinate system, or a linear coordinate system (consisting of an origin and a coordinate axis). For example, a rectangular coordinate system can be established using the worktable of the laser welding system 100 as a reference surface, with the origin set. By taking pictures with a vision camera, the target electrode terminals of multiple battery cells 200 can be addressed to determine the first coordinate, and multiple pressure nozzles 323 can be photographed to determine the preset pressure nozzle coordinates. Alternatively, a separate addressing worktable can be set up, with its upper surface used as a reference surface to establish a rectangular coordinate system.

[0092] When the number of battery cells 200 is only one row and relatively small, only the abscissa of the target electrode terminal can be obtained, with the arrangement direction of the battery cells 200 as the extension direction of the abscissa axis. For example, when the number of battery cells 200 is 2-4, only the abscissa of the target electrode terminal can be obtained as the first coordinate.

[0093] When the number of battery cells 200 is in multiple rows, a rectangular coordinate system can be established, that is, the horizontal and vertical coordinates of the target electrode terminals can be obtained as the first coordinates.

[0094] The first coordinate and the preset first coordinate are obtained, and the offset between the two is calculated. The position of the pressure nozzle 323 is adjusted according to the offset to reduce the possibility of laser irradiation on the pressure nozzle 323 during the welding process, thereby improving the reliability of welding.

[0095] In some embodiments, the number of battery cells is multiple and forms at least one row. Determining the offset of a preset pressing position of the nozzle relative to the target electrode terminal based on the deviation between a first coordinate and a preset first coordinate includes:

[0096] The offset is determined by calculating the deviation using a first calculation method based on the fact that the number of battery cells in the same row is greater than the upper limit of the first preset quantity range, and based on the fact that there are multiple pressure nozzles that the pressing unit needs to press down.

[0097] Based on the number of individual battery cells in the same row within a first preset quantity range, the deviation is calculated using a second calculation method to determine the offset.

[0098] In one example, the first preset range can be 1-n, where n can be any integer from 2 to 10.

[0099] In one example, the pressing unit includes multiple pressing nozzles. The number of pressing nozzles that need to be pressed can be one, a portion of the pressing nozzles, or all of the pressing nozzles. Here, pressing refers to pressing the busbar onto the electrode terminals.

[0100] By setting the number of battery cells in the same row in different ranges and using different deviation calculation methods to determine the offset, the laser welding method can be adapted to the welding needs of battery cells of different batch sizes. It can cover multiple production scenarios without changing the welding equipment, thus improving the versatility and adaptability of the laser welding system.

[0101] In some embodiments, please refer to Figure 4 and Figure 7 The pressing unit 32 includes multiple pressure nozzles 323, which are arranged along a first direction X. The first direction X intersects the height direction Z of the pressing unit 32. Along the first direction X, the maximum distance between the two outermost pressure nozzles 323 is set within a preset value. Based on the number of battery cells 200 in the same row, which is outside the first preset number range, the deviation is calculated using a first calculation method to determine the offset, including:

[0102] Obtain the first coordinate of each target electrode terminal corresponding to each nozzle 323;

[0103] The average value of the multiple first coordinates is obtained to get the average coordinate. The offset is determined based on the deviation between the average coordinate and the preset average coordinate.

[0104] In one example, the preset value can be any value between 100mm and 600mm.

[0105] Different battery cells have different electrode terminal spacings between adjacent cells. The number of pressure nozzles 323 to be pressed down can be determined based on the spacing between the electrode terminals of adjacent cells. For example, when the battery cells 200 are small and numerous, all pressure nozzles 323 of the pressing unit 32 need to be pressed down. When the battery cells are large, only a portion of the pressure nozzles 323 can be pressed down. For example, with eight pressure nozzles, the first, third, fifth, and seventh pressure nozzles can be pressed down, leaving the remaining nozzles suspended. When obtaining the first coordinates, only the first coordinates of the target electrode terminals corresponding to the first, third, fifth, and seventh pressure nozzles need to be obtained.

[0106] When there are a large number of battery cells 200, such as more than 8 battery cells 200 in a row, the offset can be determined by the average coordinate. This reduces the time required to adjust each pressure nozzle 323 individually, thereby improving operational efficiency.

[0107] A two-dimensional rectangular coordinate system is established based on a plane perpendicular to the pressing direction of the pressing unit 32. The X-axis of the coordinate system is set to be parallel to the arrangement direction of the pressing nozzles 323, and the Y-axis is perpendicular to both the arrangement direction of the pressing nozzles 323 and the height direction of the battery cell 200. The preset average coordinates are (X0, Y0). The actual center coordinates of the target electrode terminals corresponding to each pressing nozzle 323 can be collected by the vision module. The first coordinates corresponding to the same pressing unit 32 are (X1, Y1), (X2, Y2)...(Xn, Yn), where n is the number of target electrode terminals and n is an integer greater than or equal to 2. The coordinates are obtained by calculating (X1+X2+...+Xn) / n. The result is obtained by calculating (Y1+Y2+Yn) / n. According to X The difference or absolute value between X0 and X0 determines the offset of nozzle 323 along the X-axis, according to... The difference or absolute value of Y0 determines the offset of the nozzle 323 along the Y-axis. In other examples, the Y-axis can also be parallel to the arrangement direction of the nozzles 323, and the X-axis can be perpendicular to the arrangement direction of the nozzles 323 and the height direction of the battery cell 200, respectively.

[0108] In other examples, when there is only one row of battery cells 200, a linear coordinate system is established, with the preset average value as X0. The first coordinates corresponding to the same down-pressing unit 32 are X1, X2, ..., Xn, respectively, calculated according to the above method. , The difference or absolute value between X0 and X0 is the offset.

[0109] By calculating the deviation value using an average value, the entire pressing unit 32 can be adjusted. Setting a preset value allows for further control of the cumulative deviation of the nozzles 323 relative to the target electrode terminal, based on the overall adjustment of the pressing unit 32. This reduces the possibility of individual nozzles 323 exceeding the allowable range for laser welding due to the deviation value determined by the average value being used to adjust the entire pressing unit 32. Furthermore, the deviation between the average coordinates and the preset average coordinates allows for the overall adjustment of the nozzles 323 in the pressing unit 32. Individual adjustments to the position of each nozzle 323 relative to the target electrode terminal are unnecessary; simply adjusting the pressing unit 32 as a whole ensures that the alignment deviation of all nozzles 323 within the preset range is achieved. This method reduces the time and computation required for individual adjustments of each nozzle 323, thus improving the efficiency of the laser welding system 100.

[0110] In some embodiments, the first coordinate system is a rectangular coordinate system, and the calculated average coordinates are ( , The first preset coordinate is set as the preset average coordinate, and the preset average coordinate is (X0, Y0).

[0111] Adjust the relative position of the nozzle 323 and the target electrode terminal according to the offset, including:

[0112] according to Offset relative to X0 and / or Adjust the relative position of the nozzle 323 and the target electrode terminal by the offset relative to Y0.

[0113] A two-dimensional rectangular coordinate system is established based on a plane perpendicular to the pressing direction of the pressing unit 32. The X-axis of the coordinate system is set to be parallel to the arrangement direction of the pressing nozzles 323, and the Y-axis is perpendicular to the arrangement direction of the pressing nozzles 323; the preset average coordinate is (X0, Y0). The actual center coordinates of the target electrode terminal corresponding to each pressing nozzle 323 are collected by the vision module, which are (X1, Y1), (X2, Y2)...(Xn, Yn), where n is the number of target electrode terminals and n is an integer greater than or equal to 2.

[0114] The preset average coordinates of the target electrode terminals corresponding to each pressing unit 32 can be different.

[0115] When | - X0 |>0, | When - Y0∣=0, with | - X0 | is the X-axis adjustment amount, which adjusts the position of the nozzle 323 relative to the target electrode terminal only along the X-axis direction.

[0116] When | - X0∣=0,∣ When Y0|>0, | - Y0| is used as the Y-axis adjustment amount to adjust the position of the nozzle 323 relative to the target electrode terminal along the Y-axis direction.

[0117] When | - X0 |>0, | When Y0|>0, | - X0 | is the adjustment value for the X-axis, | - Y0| is the Y-axis adjustment amount, which corresponds to adjusting the position of the nozzle 323 relative to the target electrode terminal along the X-axis and Y-axis directions, respectively.

[0118] When | - X0∣=0,∣ When Y0∣=0, there is no need to adjust the position of nozzle 323.

[0119] The average coordinate can be the average of the coordinates of a portion of the target electrode terminals corresponding to the pressure nozzles 323 of the pressing unit 32, or it can be the average of the coordinates of all the target electrode terminals corresponding to the pressure nozzles 323 of the pressing unit 32. For example, if the pressing unit 32 has 5 pressure nozzles 323, the average can be the average of the 5 target electrode terminals corresponding to the 5 pressure nozzles 323, or it can be calculated by selecting 3 or 4 coordinates from the first set of coordinates of the 5 target electrode terminals corresponding to the 5 pressure nozzles 323. For example, the first coordinate with the smallest deviation from the preset first coordinate can be removed, and the average of the remaining first coordinates can be taken.

[0120] Therefore, the offset direction and offset amount of each nozzle 323 relative to the target electrode terminal can be accurately calculated, and the nozzle 323 can be easily adjusted according to the offset direction and offset amount to reduce the offset amount of the nozzle 323 relative to the target electrode terminal.

[0121] In some embodiments, the pressure nozzle 323 that the pressing unit 32 needs to press down is a target pressure nozzle, and the number of target pressure nozzles is at least one. Based on the number of battery cells 200 in the same row within a first preset range, the deviation is calculated using a second calculation method to determine the offset, including:

[0122] Calculate the deviation between the first coordinate and the preset first coordinate to determine the offset.

[0123] The total number of nozzles 323 in the pressing unit 32 can be greater than or equal to the target number of nozzles. For example, if the target number of nozzles is one, the total number of nozzles in the pressing unit 32 can be one or more.

[0124] After determining the offset, the pressure nozzle can be adjusted according to the offset, or the entire pressing unit 32 can be adjusted to move the target pressure nozzle relative to the target electrode terminal to the preset pressing position.

[0125] In one example, a first coordinate, X1, can be obtained based on a linear coordinate system, and a preset first coordinate, X2, can be used. The offset is determined by calculating the deviation between X1 and X2. In another example, the deviation between the first coordinate and the preset first coordinate can also be calculated based on a polar coordinate system, or the deviation between the cylindrical coordinate and the preset first coordinate can be calculated based on a rectangular coordinate system.

[0126] Therefore, the position of the pressure nozzle 323 can be adjusted according to the actual offset between each pressure nozzle 323 and the corresponding target electrode terminal, so that the pressure nozzle 323 is as concentric as possible with the target electrode terminal, thereby reducing the possibility of laser irradiation on the pressure nozzle 323 during the welding process and causing the possibility of incomplete welding.

[0127] In some embodiments, the first coordinate system is a rectangular coordinate system, the first coordinate of the i-th nozzle is (Xi, Yi), the preset pressing coordinate of the i-th nozzle is (Xpi, Ypi), and the preset first coordinate of the i-th nozzle is (X0i, Y0i), where i is an integer greater than or equal to 1. Based on the deviation between the first coordinate and the preset first coordinate, the offset of the preset pressing position of the nozzle 323 relative to the target electrode terminal is determined, including:

[0128] Calculate the difference between Xi and X0i and the difference between Yi and Y0i. Use the difference between Xi and X0i or the absolute value of the difference as the offset of Xpi, and the difference between Yi and Y0i or the absolute value of the difference as the offset of Ypi.

[0129] Multiple first coordinates can be denoted as: (X1, Y1), (X2, Y2), ..., (Xi, Yi).

[0130] Multiple preset nozzle coordinates can be denoted as: (Xp1, Yp1), (Xp2, Yp2), ..., (Xpi, Ypi).

[0131] Multiple preset first coordinates are: (X01, Y01), (X02, Y02), ..., (X0i, Y0i).

[0132] When i=1, the first first coordinate obtained is (X1, Y1), the first preset pressure nozzle coordinate used to press the busbar onto the target electrode terminal is (Xp1, Yp1), and the first preset first coordinate corresponding to the first first coordinate is (X01, Y01). The difference between X1 and X01 and the difference between Y1 and Y01 are calculated. The difference between X1 and X01 or the absolute value of the difference is taken as the offset of Xp1, and the difference between Y1 and Y01 or the absolute value of the difference is taken as the offset of Yp1.

[0133] The offset is used to compensate for the Xpi and / or Ypi of the pressure nozzle 323, and the preset pressing position of the pressure nozzle 323 is adjusted so that the pressure nozzle 323 is as concentric as possible with the target electrode terminal, thereby reducing the possibility of laser irradiation on the pressure nozzle 323 during the welding process and thus reducing the possibility of missed welding.

[0134] In some embodiments, adjusting the relative position of the nozzle 323 and the target electrode terminal until the offset is within a preset deviation range includes:

[0135] Based on the offset, the position of the pressing unit 32 relative to the target electrode terminal is adjusted so that all the nozzles 323 of the pressing unit 32 move relative to the target electrode terminal.

[0136] When |Xi - X0i|>0 and |Yi - Y0i|>0, the position of nozzle 323 along the X-axis is adjusted by the value of |Xi - X0i|, and the position of nozzle 323 along the Y-axis is adjusted by the value of |Yi - Y0i|.

[0137] When |Xi - X0i|>0 and |Yi - Y0i|=0, the value of |Xi - X0i| is used as the adjustment amount to adjust the position of the nozzle 323 along the X-axis.

[0138] When |Xi - X0i| = 0 and |Yi - Y0i| > 0, the value of |Yi - Y0i| is used as the adjustment amount to adjust the position of the nozzle 323 along the Y-axis.

[0139] When |Xi - X0i| = 0 and |Yi - Y0i| = 0, there is no need to adjust the position of the nozzle 323.

[0140] By adjusting the position of the pressing unit 32 relative to the target electrode terminal, the time required to adjust each pressing nozzle 323 individually can be reduced, thereby shortening the waiting time for welding the corresponding welding area of ​​each pressing unit 32, which is beneficial to improving the working efficiency of the laser welding system 100.

[0141] In some embodiments, the number of pressing units 32 is multiple and arranged in a row. Adjusting the relative position of the pressing nozzle 323 and the target electrode terminal according to the offset includes:

[0142] Based on the offset of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal, the position of each pressing unit 32 relative to the target electrode terminal is adjusted sequentially along the arrangement direction of the plurality of pressing units 32.

[0143] Adjusting the position of the pressing unit 32 relative to the target electrode terminal refers to adjusting the position of the pressing unit 32 relative to the target electrode terminal corresponding to the pressing unit 32.

[0144] Multiple battery cells 200 can form multiple welding areas, and these welding areas can form at least one row. Each row of welding areas is arranged along a first direction X. The number of welding areas can also be greater than, equal to, or less than the number of pressing units 32.

[0145] Figure 4 The example shows that the welding area has multiple rows of P1-P10, and each row of welding areas includes four welding areas M1-M4. Each of the M1-M4 welding areas can correspond to a pressing unit 32.

[0146] The position of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal can be adjusted sequentially. After adjusting the position of the nozzle 323 of one pressing unit 32, the position of the nozzle 323 of the next pressing unit 32 can be adjusted. Alternatively, the nozzles 323 of multiple or all pressing units 32 can be adjusted simultaneously.

[0147] This allows for the adjustment of the position of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal, and direct adjustment of the pressing unit 32 to move multiple nozzles 323 as a whole reduces the time required to adjust each nozzle individually, thus improving work efficiency. Furthermore, it also improves the consistency of welding.

[0148] In some embodiments, please refer to Figure 5 and Figure 6 The laser welding system 100 also includes a laser 41, which is movable along the arrangement direction of the nozzles 323 and is capable of welding the busbar and the target electrode terminal. The welding method also includes:

[0149] After adjusting the position of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal, control each pressing unit 32 to move simultaneously so that the nozzle 323 presses the busbar onto the target electrode terminal.

[0150] The laser 41 is controlled to perform welding operations on the busbar and the target electrode terminal.

[0151] Multiple pressing units 32 can be installed on an XYZ axis robot or a multi-axis robot. By controlling the movement of the XYZ axis robot along the pressing direction, multiple pressing units 32 can move together to perform the pressing operation.

[0152] By controlling each pressing unit 32 to move the pressing nozzle 323 and sequentially welding the target electrode terminals corresponding to the pressing nozzle 323 of each pressing unit 32, the waiting time required to control the pressing unit 32 to press down the target electrode terminals for each welding can be reduced, which is beneficial to improving the working efficiency of the laser welding system 100.

[0153] In other embodiments, based on the offset of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal, the position of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal is sequentially adjusted along the arrangement direction of the plurality of pressing units 32 until the offset is within a preset deviation range, including:

[0154] Based on the offset of the nozzle 323 of the nth pressing unit 32 relative to the target electrode terminal, where n is an integer greater than 1, adjust the position of the nozzle 323 of the nth pressing unit 32 relative to the target electrode terminal until the offset is within the preset deviation range.

[0155] Before welding the welding area corresponding to the nth pressing unit 32, the position of the pressing nozzle 323 of the (n+1)th pressing unit 32 relative to the target electrode terminal is adjusted according to the offset of the pressing nozzle 323 of the (n+1)th pressing unit 32 relative to the target electrode terminal until the offset is within the preset deviation range.

[0156] Before welding, the position of the nozzles 323 of the multiple pressing units 32 relative to the target electrode terminal can be adjusted so that the multiple pressing units 32 can be pressed down sequentially or simultaneously before welding. This can reduce the waiting time during welding in the laser welding system 100 and improve welding efficiency.

[0157] In some embodiments, controlling the laser 41 to perform welding operations on the busbar and the target electrode terminal includes:

[0158] Welding operation is performed after compensating the preset light output position of laser 41 according to the offset.

[0159] In one example, taking |Xi - X0i| and |Yi - Y0i| from the example above, when both are greater than 0, the offset along the X-axis is |Xi - X0i|, and the offset along the Y-axis is |Yi - Y0i|. These offsets are used to compensate for the preset light-emitting position of laser 41, thus determining the actual light-emitting position of laser 41. Alternatively, the |Xi - X0i| from the other example above can also be used. - X0∣ and ∣ Taking Y0 as an example, when both are greater than 0, the offset along the X-axis is | - X0 |, the offset along the Y-axis is | -X0∣.

[0160] This reduces the possibility of a large welding position offset caused by excessive deviation between the target electrode terminal and the preset pressing position, and also reduces the possibility of incomplete welding caused by a large deviation in the laser beam output from the laser 41 irradiating the nozzle 323, thereby improving the reliability of welding.

[0161] In some embodiments, obtaining the first coordinates of the target electrode terminal and the preset pressure nozzle coordinates of the pressure nozzle 323 includes:

[0162] Obtain the coordinates of the center point of the target electrode terminal;

[0163] The coordinates of the center point of the target electrode terminal are used as the first coordinates.

[0164] Therefore, the offset can be directly calculated and determined based on the coordinates of the center point of the target electrode terminal and the center point of the nozzle 323, which simplifies the offset calculation process and makes the calculation simpler and more accurate.

[0165] For ease of explanation, the following embodiments use a laser welding system from some embodiments of this application as an example.

[0166] The above-described laser welding method can be used in laser welding system 100. Please refer to [the documentation / reference]. Figures 5-8 The laser welding system 100 includes a pressing device 30, a data acquisition module 10, and a control device 20. The data acquisition module 10 is used to acquire the first coordinates of the target electrode terminal. The pressing device 30 includes a pressing unit 32 and a driving component 31. The pressing unit 32 includes at least one pressure nozzle 323 for pressing the busbar onto the target electrode terminal of the battery cell 200. The driving component 31 is driven and connected to the pressing unit 32, and is configured to drive the pressing unit 32 to move relative to the target electrode terminal along a first direction X, a second direction Y, and a height direction Z of the pressing unit 32. The first direction X and the second direction Y intersect, and the plane containing both the first direction X and the second direction Y intersects with the height direction Z of the pressing unit 32. The control device 20 is communicatively connected to the acquisition module 10 and the drive component 31, respectively. It is used to determine the offset of the preset pressing position of the nozzle 323 relative to the target electrode terminal based on the deviation between the first coordinate and the preset first coordinate. It is also used to adjust the relative position of the nozzle 323 and the target electrode terminal through the drive component 31 according to the offset. Furthermore, it is used to move the nozzle 323 relative to the target electrode terminal along the height direction Z through the drive component 31.

[0167] The acquisition module 10 includes a CCD camera, an industrial CMOS camera, or a 3D camera, etc.

[0168] The control device 20 can be an industrial computer or a PLC programmable controller, etc.

[0169] The drive component 31 can be a multi-axis manipulator or an XYZ axis robot.

[0170] Taking a robot with drive component 31 as an example, specifically an XYZ axis robot, please refer to... Figures 5-7 , Figure 9 The laser welding system 100 includes a frame 314 and a driving component 31 including a first driving component 311, a second driving component 312, and a third driving component 313. The first driving component 311 is disposed on the frame 314 and is drivenly connected to the second driving component 312. The second driving component 312 is drivenly connected to the third driving component 313. The first driving component 311 is used to drive the second driving component 312 to move relative to the frame 314 along the second direction Y. The second driving component 312 is used to drive the third driving component 313 to move relative to the frame 314 along the height direction Z. The third driving component 313 is drivenly connected to the pressing unit 32 and is used to drive the pressing unit 32 to move along the first direction X.

[0171] The first drive component 311, the second drive component 312, and the third drive component 313 can all be linear modules or linear motors.

[0172] The acquisition module 10 acquires the first coordinates, calculates the offset between the two through the control device 20, and controls the drive component 31 to adjust the position of the pressure nozzle 323 according to the offset, so as to reduce the possibility of laser irradiation on the pressure nozzle 323 during the welding process and thus improve the reliability of welding.

[0173] In some embodiments, please refer to Figure 5 and Figure 6 The laser welding system 100 also includes a welding component 40, which includes a laser 41 and a welding drive component 42. The laser 41 is located on one side of the drive component 31 and is used to weld the busbar and target electrode terminals. The welding drive component 42 is driven and connected to the laser 41. The welding drive component 42 can be a multi-axis manipulator or an XYZ-axis robot. The control device 20 is driven and connected to the welding drive component 42 to compensate for the preset welding position of each target electrode terminal according to the offset, thereby improving the welding accuracy.

[0174] In some embodiments, please refer to Figure 5 and Figure 6 The driving component 31 includes a plurality of driving units arranged along the first direction X, each driving unit being connected to a pressing unit 32, and each driving unit being configured to individually drive the pressing unit 32 to move relative to the target electrode terminal along the first direction X.

[0175] Taking the aforementioned drive component 31, which includes a first drive component 311, a second drive component 312, and a third drive component 313, as an example, the third drive component 313 can be a linear motor with multiple movers, each mover serving as a drive unit. It is communicatively connected to the linear motor via a control device 20, enabling individual control of each drive unit. This allows for individual adjustment of the position of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal along the first direction X. In other examples, the third drive component 313 may include multiple sets of ball screw mechanisms. The screw of each ball screw mechanism is rotatably connected to the drive connection part of the second drive component 312, and the multiple pressing units 32 are slidably connected to the drive connection part along the first direction X. Each screw is rotatably connected to a nut, and each nut is fixedly connected to the pressing unit 32. Each screw is driven individually by a motor. In other words, the drive component 31 includes multiple first linear modules for driving multiple pressing units 32, with each pressing unit 32 being driven in a one-to-one correspondence through the first linear modules. The first linear module can be disposed in the drive connection part of the second drive component 312.

[0176] Therefore, the position of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal along the first direction X can be adjusted individually according to the offset, so that the nozzles 323 of multiple pressing units 32 can be adjusted to simultaneously press down on multiple target electrode terminals, thereby reducing the time required to perform pressing operations sequentially and improving operating efficiency.

[0177] In some embodiments, please refer to Figure 7 The pressing unit 32 includes a first connecting member 321 and a second connecting member 322. The first connecting member 321 is fixedly connected to the driving part. The pressing unit 32 also includes a driving adjustment member 333. The driving adjustment member 333 is drivingly connected to the second connecting member 322. The driving adjustment member 333 can drive the second connecting member 322 to move relative to the first connecting member 321 along the second direction Y.

[0178] The drive adjustment component 333 is communicatively connected to the control device 20, and the control device 20 can adjust the position of the nozzle 323 relative to the target electrode terminal along the second direction Y through the drive adjustment component 333.

[0179] The connection between the first connecting member 321 and the drive unit includes welding, screw connection or riveting.

[0180] The first connecting member 321 can be slidably connected to the second connecting member 322 along the second direction Y via a guide rail slider mechanism. Specifically, the guide rail can be fixedly installed on the first connecting member 321, and the slider can be fixedly installed on the second connecting member 322, with the slider slidably connected to the guide rail along the second direction Y. Alternatively, the guide rail can be installed on the second connecting member 322, and the slider can be installed on the first connecting member 321.

[0181] The drive adjustment component 333 can be an electric actuator, a hydraulic cylinder, or a linear module, etc.

[0182] Therefore, the position of the nozzle 323 of each pressing unit 32 relative to the target electrode terminal along the second direction Y can be adjusted individually according to the offset, so that the nozzles 323 of multiple pressing units 32 can be adjusted to simultaneously press down on multiple target electrode terminals, thereby reducing the time required to perform pressing operations sequentially and improving operating efficiency.

[0183] In some embodiments, the pressing unit 32 may include an XY-axis manipulator, which is mounted on the drive unit and drivenly connected to the nozzle 323. The XY-axis manipulator can drive the nozzle 323 to move relative to the battery cell 200 along the first direction X and the second direction Y, so as to realize the individual adjustment of the single nozzle 323. In the above laser welding method, by calculating the difference between Xi and X0i and calculating the difference between Yi and Y0i, the difference between Xi and X0i or the absolute value of the difference is used as the offset of Xpi, and the difference between Yi and Y0i or the absolute value of the difference is used as the offset of Ypi. The XY manipulator is controlled individually to adjust the offset of the nozzle 323 relative to the target electrode terminal.

[0184] For ease of explanation, the following embodiments use a battery production system from some embodiments of this application as an example.

[0185] A battery production system, including the laser welding methods of the above embodiments or the laser welding system 100 including the above embodiments.

[0186] Since the battery production system includes all the technical features of the above welding method or laser welding system 100, and has the same effect as described above, it will not be repeated here.

[0187] For ease of explanation, the following embodiments use a storage medium from some embodiments of this application as an example.

[0188] The storage medium is used to store the computer program, which is executed using the laser welding method described above.

[0189] Storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory, electrically erasable programmable read-only memory, erasable programmable read-only memory, programmable read-only memory, read-only memory, magnetic memory, flash memory, magnetic disk or optical disk, etc.

[0190] Since the storage medium stores the computer program, the laser welding method used when the computer program runs has the same effect as described above, and will not be repeated here.

[0191] In a specific optional embodiment of the laser welding method, the number of pressing units 32 is multiple and they are arranged in a row. Please refer to [reference needed]. Figure 4 The laser welding method includes the following steps:

[0192] S01: Based on a Cartesian coordinate system on a plane perpendicular to the pressing direction of the pressing unit 32, obtain the first coordinates corresponding to the nozzle 323 of each pressing unit 32, and record each first coordinate as (X1, Y1), (X2, Y2) ... (Xn, Yn).

[0193] S02: Take the average of the first coordinates of all target electrode terminals corresponding to each pressing unit 32, and calculate (X1+X2+ … + Xn) / n to obtain The result is obtained by calculating (Y1+Y2+Yn) / n. .

[0194] S03: Calculate the deviation between the average coordinate and the preset average coordinate. -X0 is the offset on the X-axis. -Y0 is the Y-axis offset.

[0195] S04: Based on the offset of the X-axis and the offset of the Y-axis and the offset direction of the nozzle 323 relative to the target electrode terminal, the preset pressing position of the nozzle 323 of each pressing unit 32 is compensated respectively, that is, the pressing unit 32 is offset from the preset pressing position according to the offset.

[0196] S05: Control each pressing unit 32 to perform pressing operation simultaneously, so that the pressing nozzle 323 presses the busbar onto the target electrode terminal.

[0197] S06: Compensate the preset welding coordinates of laser 41 based on the offset of the X-axis and the offset of the Y-axis.

[0198] S07: Control the laser 41 to perform welding operations sequentially along the arrangement direction of multiple pressing units 32 until the welding of the same row of target electrode terminals is completed.

[0199] S08: Control multiple pressing units 32 to move simultaneously above the next row of target electrode terminals, return to step S01, until all target electrode terminals of the battery are welded.

[0200] The preset pressing position of the pressure nozzle 323 corresponds to the preset first coordinate of the target electrode terminal. When the pressure nozzle 323 is at the preset pressing position and the target electrode terminal is at the preset first coordinate position, the two are concentric. After the stacking process of multiple battery cells 200, the actual first coordinate is obtained and offset from the preset first coordinate. By averaging the first coordinates corresponding to each pressing unit 32, the offset is determined by calculating the average value and the average value of the preset coordinates. Then, the pressing unit 32 is offset from the preset pressing position according to the offset to reduce the offset between each pressure nozzle 323 and the target electrode terminal corresponding to the pressure nozzle 323. This reduces the possibility of laser irradiation on the pressure nozzle 323 during the welding process, thereby reducing the possibility of incomplete welding. In addition, adjusting the pressing unit 32 according to the offset can reduce the adjustment time compared with adjusting each pressure nozzle 323 individually, which is beneficial to improving the working efficiency of the laser welding system 100.

[0201] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A laser welding method for use in a laser welding system, the laser welding system comprising a pressing unit, the pressing unit comprising at least one pressing nozzle, the pressing nozzle being used to press a busbar onto a target electrode terminal of a battery cell, the battery cells being a plurality of cells arranged in at least one row, characterized in that, The laser welding method includes: The first coordinates of the target electrode terminal are obtained based on the first coordinate system, wherein the pressing direction of the pressing unit is perpendicular to the first coordinate system; Based on the fact that the number of battery cells in the same row is greater than the upper limit of a first preset number, the deviation between the first coordinate and the preset first coordinate is calculated using a first calculation method to determine the offset of the preset pressing position of the nozzle relative to the target electrode terminal. The calculation of the deviation between the first coordinate and the preset first coordinate using the first calculation method includes: obtaining the first coordinate of the target electrode terminal corresponding to each nozzle; averaging the obtained multiple first coordinates to obtain the average coordinate; and calculating the deviation value between the average coordinate and the preset average coordinate. Based on the number of battery cells in the same row being within the first preset number range, the deviation is calculated using a second calculation method to determine the offset of the preset pressing position of the nozzle relative to the target electrode terminal. The second calculation method for calculating the deviation includes: calculating the deviation value between the first coordinate and the preset first coordinate. Adjust the relative position of the nozzle and the target electrode terminal according to the offset.

2. The laser welding method according to claim 1, characterized in that, The pressing unit includes a plurality of pressing nozzles, which are arranged along a first direction. The first direction intersects the height direction of the pressing unit. Along the first direction, the maximum distance between the two outermost pressing nozzles is set within a preset value. The deviation is calculated using the first calculation method based on the number of battery cells in the same row, which is outside a first preset number range.

3. The laser welding method according to claim 2, characterized in that, The first coordinate system is a rectangular coordinate system, and the calculated average coordinates are (X... Y The preset first coordinate is set as the preset average coordinate, and the preset average coordinate is (X0, Y0). Adjusting the relative position of the nozzle and the target electrode terminal according to the offset includes: According to X Offset relative to X0 and / or Y Adjust the relative position of the nozzle and the target electrode terminal by the offset relative to Y0.

4. The laser welding method according to claim 1, characterized in that, The pressure nozzle that the pressing unit needs to press down is the target pressure nozzle, and the number of the target pressure nozzles is at least one. The deviation is calculated using the second calculation method based on the number of battery cells in the same row being within the first preset number range.

5. The laser welding method according to claim 4, characterized in that, The first coordinate system is a rectangular coordinate system. The first coordinate of the i-th nozzle is (Xi, Yi), the preset pressing coordinate of the i-th nozzle is (Xpi, Ypi), and the preset first coordinate is (X0i, Y0i), where i is an integer greater than or equal to 1. Based on the deviation between the first coordinate and the preset first coordinate, the offset of the preset pressing position of the nozzle relative to the target electrode terminal is determined, including: Calculate the difference between Xi and X0i and the difference between Yi and Y0i. Use the difference between Xi and X0i or the absolute value of the difference as the offset of Xpi, and the difference between Yi and Y0i or the absolute value of the difference as the offset of Ypi.

6. The laser welding method according to any one of claims 1-5, characterized in that, Adjusting the relative position of the nozzle and the target electrode terminal includes: Based on the offset, the position of the pressing unit relative to the target electrode terminal is adjusted so that all the nozzles of the pressing unit move relative to the target electrode terminal.

7. The laser welding method according to any one of claims 1-5, wherein the number of pressing units is plurality of and forms at least one row, characterized in that, Adjusting the relative position of the nozzle and the target electrode terminal according to the offset includes: Based on the offset, the position of each of the pressing units relative to the target electrode terminal is adjusted sequentially along the arrangement direction of the plurality of pressing units.

8. The laser welding method according to claim 7, wherein the laser welding system further comprises a laser, the laser being movable along the arrangement direction of the nozzles and capable of welding the busbar and the target electrode terminal, characterized in that, The welding method further includes: After adjusting the position of the pressure nozzle of each of the pressing units relative to the target electrode terminal, control each of the pressing units to move simultaneously so that the pressure nozzle presses the busbar onto the target electrode terminal; The laser is controlled to perform welding operations on the busbar and the target electrode terminal.

9. The laser welding method according to claim 8, characterized in that, Controlling the laser to perform welding operations on the busbar and the target electrode terminal includes: Welding operation is performed after compensating the preset light emission position of the laser according to the offset.

10. The laser welding method according to any one of claims 1-5, characterized in that, Obtaining the first coordinates of the target electrode terminal and the preset coordinates of the pressure nozzle includes: Obtain the coordinates of the center point of the target electrode terminal; The coordinates of the center point of the target electrode terminal are used as the first coordinates.

11. A laser welding system for use in the laser welding method as described in any one of claims 1-10, characterized in that, The laser welding system includes: The acquisition module is used to obtain the first coordinates of the target electrode terminal; A pressing device includes a pressing unit and a driving component. The pressing unit includes at least one pressing nozzle for pressing a busbar onto a target electrode terminal of a battery cell. The driving component is drivenly connected to the pressing unit and is configured to drive the pressing unit to move relative to the target electrode terminal along a first direction, a second direction, and the height direction of the pressing unit. The first direction and the second direction intersect, and the plane containing the first direction and the second direction intersects with the height direction of the pressing unit. The control device is communicatively connected to the acquisition module and the drive component, respectively. It is used to determine the offset of the preset pressing position of the nozzle relative to the target electrode terminal based on the deviation between the first coordinate and the preset first coordinate. It is also used to adjust the relative position of the nozzle and the target electrode terminal through the drive component based on the offset. Furthermore, it is used to move the nozzle relative to the target electrode terminal along the height direction through the drive component.

12. The laser welding system according to claim 11, characterized in that, The driving component includes a plurality of driving units arranged along a first direction, each driving unit being connected to a pressing unit, and each driving unit being configured to individually drive the pressing unit to move relative to the target electrode terminal along the first direction.

13. The laser welding system according to claim 12, characterized in that, The pressing unit includes a first connecting member and a second connecting member. The first connecting member is fixedly connected to the driving part. The pressing unit also includes a driving adjustment component. The driving adjustment component is drivingly connected to the second connecting member. The driving adjustment component can drive the second connecting member to move relative to the first connecting member in the second direction. The drive adjustment component is communicatively connected to the control device, and the control device can adjust the position of the nozzle relative to the target electrode terminal along the second direction through the drive adjustment component.

14. A battery production system, characterized in that, Includes the laser welding method as described in any one of claims 1-10 or the laser welding system as described in claims 11-13.

15. A storage medium, characterized in that, The storage medium is used to store a computer program, which, when executed, employs the laser welding method as described in any one of claims 1-10.

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