Method for welding control of an electric cell and welding system

Abstract

The application discloses a welding control method and a welding system of an electric core, which are applied to the field of batteries. After a first welding device welds a pole of the electric core according to a first welding parameter, the controller can obtain a weld seam image of a weld seam in the pole, obtain an actual offset of the weld seam relative to the contour of the pole based on the weld seam image, and then automatically compensate the first welding parameter of the first welding device based on the actual offset when the difference between the actual offset and a standard offset is outside a difference range, so as to realize automatic deviation correction of the weld seam. Compared with the related art, the method provided by the application is not affected by human subjective factors, improves the accuracy of the judgment on whether the deviation of the weld seam relative to the contour of the pole is large, improves the accuracy of the compensation of the first welding parameter of the first welding device, improves the accuracy of the deviation correction, and further improves the reliability of the welding control.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a welding control method and welding system for battery cells. Background Technology

[0002] Batteries are a crucial power component for new energy vehicles. During battery production, after welding the terminals of the battery cells using welding equipment to form welds, the deviation of the weld from the terminal's outline is typically observed manually. If the deviation is significant, the welding equipment parameters are manually adjusted to re-weld the terminal. This manual operation results in lower accuracy in correcting deviations. Summary of the Invention

[0003] This invention provides a welding control method and welding system for battery cells, which can solve the problem of low accuracy in correction in related technologies. The technical solution is as follows:

[0004] On the one hand, a method for controlling the welding of battery cells is provided, the method including:

[0005] Obtain the standard offset of the standard weld relative to the profile of the standard pole in the weld template image;

[0006] The first welding equipment is controlled to weld the terminals of the battery cell according to the first welding parameters;

[0007] Obtain the weld image of the weld seam in the pole post;

[0008] Based on the weld image, obtain the actual offset of the weld relative to the pole profile;

[0009] When the difference between the actual offset and the standard offset is outside the range of the difference, the first welding parameters of the first welding equipment are compensated based on the actual offset.

[0010] Optionally, before controlling the first welding equipment to weld the terminals of the battery cell according to the first welding parameters, the method further includes:

[0011] If the battery module to which the cell belongs meets the welding requirements, the battery module is moved to the first welding room;

[0012] If the battery module to which the cell belongs does not meet the welding requirements, the first alarm message will be issued.

[0013] Optionally, the battery module includes multiple battery cells; the method also includes:

[0014] If the terminals of multiple cells meet the preset conditions, the battery module is determined to meet the welding requirements.

[0015] If at least one cell's terminal does not meet the preset conditions, the battery module is determined to not meet the welding requirements.

[0016] The preset conditions include at least one of the following:

[0017] At least two target poles, the spacing between any two adjacent target poles in the cell width direction is within a first preset range, and the cells to which the at least two target poles belong are arranged along the cell width direction;

[0018] The distance between any two target terminals along the length of the cell is within a second preset range;

[0019] The height of each target pole is within the third preset range.

[0020] If, in at least two target terminals, the spacing between any two adjacent target terminals in the cell width direction is outside a first preset range, and / or, the spacing between any two target terminals in the cell length direction is outside a second preset range, the controller can determine that the position of the terminal in some cells of the battery module is deviated. If the terminal is welded, the weld will be located outside the terminal.

[0021] When the electrode height is too high (or too low), it will affect the defocusing of the galvanometer in the first welding equipment during the subsequent welding process. A high electrode height can lead to incomplete welds on that electrode. A low electrode height can result in deeper welds on that electrode, potentially causing cell leakage.

[0022] Optionally, before checking whether the battery module to which the cell belongs meets the welding requirements, the method also includes:

[0023] The cleaning equipment is controlled to clean each terminal in the battery module. This cleans the electrolyte from the terminal surface, ensuring a better welding result for the subsequent terminals.

[0024] Optionally, before controlling the cleaning equipment to clean the individual terminals in the battery module, the method further includes:

[0025] Perform low-voltage insulation testing on the battery module;

[0026] The cleaning equipment is controlled to clean each terminal in the battery module, including:

[0027] After the low-voltage insulation test of the battery module is passed, the cleaning equipment is controlled to clean each terminal in the battery module.

[0028] Optionally, if the difference between the actual offset and the standard offset for each of the multiple poles is within the range of difference, the method further includes:

[0029] Cell contact system (CCS) components are installed on each terminal post in the battery module to which the cell belongs.

[0030] After installing CCS modules on each terminal in the battery module to which the cell belongs, the method also includes:

[0031] Move the battery module to the second welding room;

[0032] The second welding equipment is controlled to weld the CCS components covering each pole according to the second welding parameters, so as to form welds on the CCS components.

[0033] In this case, the second welding power in the second welding parameter is greater than the first welding power in the first welding parameter.

[0034] When the difference between the actual offset and the standard offset for each of the multiple poles is within the specified range, the CCS assembly covering the poles is welded. This ensures the accuracy of the weld position on the poles and effectively prevents welding quality problems caused by weld trajectory deviation on the poles during high-power welding.

[0035] Optionally, the method further includes:

[0036] With the weld seam morphology on each CCS component meeting the preset requirements, the battery module is moved to the cleaning station, and the cleaning equipment is controlled to clean the window area of ​​each cell in the battery module.

[0037] If the weld morphology on at least one CCS component does not meet the preset requirements, a second alarm message will be issued.

[0038] Optionally, based on the weld image, the actual offset of the weld relative to the pole profile is obtained, including:

[0039] Obtain the weld seam and the outline of the pole in the weld seam image;

[0040] Based on the weld image, obtain the first position of the center point of the weld;

[0041] Based on the weld image, obtain the second position of the center point of the pole's profile;

[0042] The offsets of the first and second positions are taken as the actual offsets of the weld relative to the profile of the pole post.

[0043] Optionally, based on the weld image, the actual offset of the weld relative to the pole profile is obtained, including:

[0044] Obtain the weld seam and the outline of the pole in the weld seam image;

[0045] Obtain the first position of the center point of the weld;

[0046] Obtain the third position of the pole's outline;

[0047] The offsets of the first and third positions are taken as the actual offsets of the weld relative to the profile of the pole post.

[0048] On the other hand, a computer-readable storage medium is provided that stores a computer program thereon, which, when executed by a processor, implements the welding control method for the battery cell described above.

[0049] In another aspect, a controller is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the cell welding control method described above.

[0050] In another aspect, a welding system is provided, which includes a first welding device and the controller described above.

[0051] This application provides a welding control method and welding system for battery cells. In this method, after the controller welds the electrode post of the battery cell using a first welding device according to first welding parameters, it can acquire a weld image of the weld seam in the electrode post. Based on the weld image, it obtains the actual offset of the weld seam relative to the electrode post's contour. Then, if the difference between the actual offset and the standard offset is outside the acceptable range, it automatically compensates for the first welding parameters of the first welding device based on the actual offset, thereby achieving automatic weld seam correction. Compared to related technologies, the method provided in this application is not affected by subjective human factors, improving the accuracy of judging whether the deviation of the weld seam relative to the electrode post's contour is large, while also improving the accuracy of compensation for the first welding parameters of the first welding device, improving the accuracy of correction, and thus improving the reliability of welding control.

[0052] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0053] Figure 1 This is a flowchart of a battery cell welding control method provided in an embodiment of this application;

[0054] Figure 2This is a flowchart of another battery cell welding control method provided in an embodiment of this application;

[0055] Figure 3 This is a schematic diagram of a standard weld image provided in an embodiment of this application;

[0056] Figure 4 This is a schematic diagram of multiple battery cells provided in an embodiment of this application;

[0057] Figure 5 This is a schematic diagram of a weld image provided in an embodiment of this application;

[0058] Figure 6 This is a schematic diagram of the structure of a controller provided in an embodiment of this application;

[0059] Figure 7 This is a block diagram of a battery cell welding control device provided in an embodiment of the present invention. Detailed Implementation

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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).

[0066] 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," and "circumferential" 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 are not intended to 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.

[0067] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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.

[0068] Batteries are an important power component of new energy vehicles. During the battery production process, after welding the terminals of the battery cell using welding equipment to form a weld seam on the terminal, it is usually observed manually to see if the deviation of the weld seam from the outline of the terminal is large. If the deviation is large, the parameters of the welding equipment are adjusted manually so that the welding equipment can re-weld the terminal.

[0069] However, manual methods are affected by the subjective factors of the inspectors, resulting in lower accuracy in judging whether the deviation is large. At the same time, the accuracy of adjusting the parameters of the welding equipment is also low, leading to lower accuracy in correction.

[0070] This application provides a welding control method for battery cells. In this method, after the controller controls a first welding device to weld the electrode post of the battery cell according to first welding parameters, it can acquire a weld image of the weld seam in the electrode post. Based on the weld image, it obtains the actual offset of the weld seam relative to the electrode post's contour. Then, if the difference between the actual offset and the standard offset is outside the acceptable range, it automatically compensates for the first welding parameters of the first welding device based on the actual offset, thereby achieving automatic weld seam correction. Compared to related technologies, the method provided in this application is not affected by subjective human factors, improving the accuracy of judging whether the deviation of the weld seam relative to the electrode post's contour is large, while also improving the accuracy of compensation for the first welding parameters of the first welding device, improving the accuracy of correction, and thus improving the reliability of battery cell welding control.

[0071] Figure 1 This is a flowchart illustrating a welding control method for battery cells provided in an embodiment of this application. This method can be applied to a controller in a welding system. Figure 1 As shown, the method includes:

[0072] Step 101: Obtain the standard offset of the standard weld relative to the outline of the standard pole in the weld template image.

[0073] The weld template image includes a standard weld and a standard pole, with the standard weld located on the standard pole. The standard offset is the offset of the standard weld relative to the outline of the standard pole in the weld template image. The distance between the center point of the standard weld and the center point of the standard pole's outline is less than or equal to a preset distance; for example, the preset distance can be 0, meaning the center point of the standard weld coincides with the center point of the standard pole's outline. The controller can pre-store the weld template image and can identify the offset of the standard weld relative to the standard pole's outline in the weld template image. Alternatively, the controller can pre-store the standard offset.

[0074] Step 102: Control the first welding equipment to weld the electrode of the battery cell according to the first welding parameters, and obtain the weld image of the weld in the electrode.

[0075] After acquiring the standard offset, the controller can control the first welding equipment to weld the terminals of the battery cell according to the first welding parameters to form a weld on the terminals. The controller can pre-store the first welding parameters. Subsequently, the controller can acquire a weld image of the weld in the terminal, which can include the outline of the terminal and the weld itself.

[0076] Optionally, the controller can capture images of the weld seam by photographing the pole.

[0077] Step 103: Based on the weld image, obtain the actual offset of the weld relative to the pole profile.

[0078] After acquiring the weld seam image, the controller can obtain the actual offset of the weld seam relative to the pole post in the weld seam image.

[0079] Step 104: If the difference between the actual offset and the standard offset is outside the range of the difference, compensate the first welding parameters of the first welding equipment based on the actual offset.

[0080] After acquiring the actual offset of the weld seam relative to the pole post's contour, the controller can detect whether the difference between the actual offset and the standard offset is outside the acceptable range. If the difference is outside this range, the controller can determine that the deviation of the weld seam relative to the pole post's contour is significant. Therefore, the first welding parameters of the first welding equipment can be compensated based on the actual offset, allowing the first welding equipment to re-weld the pole post according to the compensated parameters. This ensures that the actual offset of the newly formed weld seam relative to the pole post's contour is within the acceptable range compared to the standard offset. This achieves automatic deviation correction.

[0081] In summary, this application provides a welding control method for battery cells. In this method, after the controller welds the electrode post of the battery cell using a first welding device according to first welding parameters, it can acquire a weld image of the weld seam in the electrode post. Based on the weld image, it obtains the actual offset of the weld seam relative to the electrode post's contour. Then, if the difference between the actual offset and the standard offset is outside the acceptable range, it automatically compensates for the first welding parameters of the first welding device based on the actual offset, thereby achieving automatic weld seam correction. Compared to related technologies, the method provided in this application is not affected by subjective human factors, improving the accuracy of judging whether the deviation of the weld seam relative to the electrode post's contour is large. It also improves the accuracy of compensating for the first welding parameters of the first welding device, enhancing the accuracy of weld seam correction, and thus improving the reliability of welding control.

[0082] Figure 2 This is a flowchart of another battery cell welding control method provided in an embodiment of this application. This method can be applied to the controller in a welding system. Figure 2 As shown, the method may include:

[0083] Step 201: Obtain the standard offset of the standard weld relative to the outline of the standard pole in the weld template image.

[0084] The controller can acquire a weld template image and obtain a standard offset based on the weld template image. Alternatively, the standard offset can be pre-stored in the controller.

[0085] Figure 3 This is a schematic diagram of a weld template image provided in an embodiment of this application, such as... Figure 3 As shown, the weld template image includes a standard weld 10 and a standard pole post 11, with the standard weld 10 located within the outline of the standard pole post 11. The standard offset is the offset of the standard weld 10 relative to the outline of the standard pole post 11 in the weld template image. The distance between the center point of the standard weld 10 and the center point of the outline of the standard pole post 11 is less than or equal to a preset distance; for example, the preset distance can be 0, meaning the center point of the standard weld 10 coincides with the center point of the outline of the standard pole post 11.

[0086] The controller can use image recognition to identify the standard weld and the outline of the standard pole in the weld template image, and use geometric calculation algorithms to obtain the offset of the standard weld relative to the outline of the standard pole in the weld template image.

[0087] In this embodiment, the standard offset can be the offset of the center point of the standard weld relative to the center point of the profile of the standard pole post, as referenced. Figure 3 The standard offset may include: the center point of the standard weld 10 and the center point of the outline of the standard pole post 11, a first standard offset in the cell width direction X, and a second standard offset in the cell length direction Y.

[0088] Alternatively, the standard offset is the offset of the center point of the standard weld relative to the profile of the standard pole. (Reference) Figure 3 The standard offset may include the center point of the standard weld 10 and the reference point on the outline of the standard pole post 11, a third standard offset in the cell width direction X, and a fourth standard offset in the cell length direction Y.

[0089] In this embodiment, the weld template image can be obtained by photographing a standard weld and a standard pole, with the standard weld located on the standard pole. The operator can perform at least one welding operation on the standard pole to form a standard weld.

[0090] Step 202: Perform a low-voltage insulation test on the battery module.

[0091] After installing multiple battery cells into a housing, a battery module is obtained. The battery modules contain an array of battery cells arranged in this array.

[0092] Afterwards, the controller can move the battery module to the insulation test station and perform a low-voltage insulation test on the battery module. If the low-voltage insulation test of the battery module passes, the controller can proceed to step 203. If the low-voltage insulation test of the battery module fails, the controller can issue a third alarm message. This third alarm message is used to indicate that the low-voltage insulation test of the battery module has failed.

[0093] Step 203: Control the cleaning equipment to clean each terminal in the battery module.

[0094] If the low-voltage insulation test of the battery module passes, the controller can move the battery module to the cleaning station and control the cleaning equipment to clean the terminals of each cell in the battery module to remove residual electrolyte on the terminal surface and ensure the subsequent welding effect of the terminals.

[0095] Optionally, the cleaning equipment can use a special cleaning solution to clean the terminals of each battery cell.

[0096] Step 204: Check whether the battery module meets the welding requirements.

[0097] After the controller controls the cleaning equipment to clean each terminal in the battery module, it can move the battery module to the pre-welding inspection station and check whether the battery module meets the welding requirements. If the battery module does not meet the welding requirements, the controller can execute step 205. If the battery module meets the welding requirements, the controller can execute step 206.

[0098] In this embodiment, if the terminals of multiple battery cells meet preset conditions, the controller can determine that the battery module meets the welding requirements. If the terminals of at least one battery cell do not meet the preset conditions, the controller can determine that the battery module does not meet the welding requirements. The preset conditions may include at least one of the following:

[0099] At least two target poles, the spacing between any two adjacent target poles in the cell width direction is within a first preset range, and the cells to which the at least two target poles belong are arranged along the cell width direction;

[0100] The distance between any two target terminals along the length of the cell is within a second preset range;

[0101] The height of each target pole is within the third preset range.

[0102] The target electrode post is positioned perpendicular to the bottom surface of the battery module's casing. This target electrode post height can be the distance between the top of the target electrode post and the top surface of the battery cell.

[0103] Both the top and bottom surfaces of the battery cell are parallel to the bottom surface of the battery module housing, with the top surface of the cell being further away from the bottom surface of the housing relative to its bottom surface. The width direction of the cell refers to the width of its top surface, and the length direction refers to the length of its top surface. The top of the target terminal post is further away from the bottom of the housing relative to the top surface of the cell.

[0104] The preset conditions can be used to detect the position of the electrode post and whether its height exceeds the preset range, thereby confirming whether the electrode post is qualified.

[0105] If, in at least two target terminals, the spacing between any two adjacent target terminals in the cell width direction is outside a first preset range, and / or, the spacing between any two target terminals in the cell length direction is outside a second preset range, the controller can determine that the position of the terminal in some cells of the battery module is deviated. If the terminal is welded, the weld will be located outside the terminal.

[0106] When the electrode height is too high (or too low), it will affect the defocusing of the galvanometer in the first welding equipment during the subsequent welding process. A high electrode height can lead to incomplete welds on that electrode. A low electrode height can result in deeper welds on that electrode, potentially causing cell leakage.

[0107] refer to Figure 4 The battery module may include six battery cells arranged in a 3×2 array. At least two cells arranged along the width direction X include cell A, cell B, and cell C. Cell A has a terminal A1, cell B has a terminal B1, and cell C has a terminal C1. The at least two target terminals may include terminal A1, terminal B1, and terminal C1.

[0108] In this embodiment of the application, the controller can control the first image acquisition device to take pictures of the top surface of each battery cell to obtain a first image. Based on the first image, it identifies whether the distance between any two adjacent target terminals in the width direction of the battery cell is within a first preset range, and whether the distance between any two target terminals in the length direction of the battery cell is within a second preset range.

[0109] Furthermore, the controller can control the second image acquisition device to take pictures of the height of each target pole along the height direction of the target pole, obtaining a second image, and then the height of the target pole can be identified based on the second image. For example, the first image acquisition device can be a 2D camera, and the second image acquisition device can be a 3D camera.

[0110] Step 205: Issue the first alarm message.

[0111] If the battery module does not meet the welding requirements, the controller can issue a first alarm message. This first alarm message indicates that the battery module does not meet the welding requirements, and therefore the controller can remove the battery module from the workstation.

[0112] Step 206: Move the battery module to the first welding chamber.

[0113] If the battery module meets the welding requirements, the controller can move the battery module to the first welding chamber. This allows for low-power welding of the terminals on each cell within the first welding chamber.

[0114] Step 207: Control the first welding equipment to perform welding on the electrode post of the battery cell according to the first welding parameters, so as to form a weld on the electrode post.

[0115] After the controller moves the battery module to the first welding chamber, it can respond to a correction command and control the first welding equipment to weld on the terminals of the battery cell according to the first welding parameters to form a weld on the terminals. The first welding parameters may include a first welding power, which is less than or equal to a power threshold, that is, low power is used to weld on the terminals of the battery cell.

[0116] The welding system may also include a first welding device, which may be a laser welding device, and the first welding parameters may include galvanometer deflection angle, oscillation amplitude, weld trajectory, etc.

[0117] In this embodiment of the application, the controller can control the first welding equipment to weld the terminals of multiple battery cells sequentially according to the first welding parameters and the first preset order, so as to form weld seams on each terminal.

[0118] Step 208: Obtain the weld image of the weld in the pole post, and based on the weld image, obtain the actual offset of the weld relative to the contour of the pole post.

[0119] After the controller performs welding on the electrode post of the battery cell according to the first welding parameters using the first welding equipment to form a weld seam on the electrode post, it can acquire an image of the weld seam in the electrode post in response to an image acquisition command. This image acquisition command can be manually triggered by an operator on a display device. (Referring to...) Figure 5 The weld image may include pole post 20 and weld 21 on pole post 20.

[0120] Optionally, the welding system may also include a third image acquisition device equipped with a ring light source. This third image acquisition device may be an area array camera. The controller controls the third image acquisition device to capture images of the pole and the weld seam to obtain weld seam images.

[0121] After acquiring the weld seam image, the controller can obtain the actual offset of the weld seam relative to the pole post profile based on the weld seam image.

[0122] Optionally, the controller can use image recognition and geometric calculation algorithms to obtain the actual offset of the weld seam relative to the pole post profile.

[0123] In one optional implementation of this application embodiment, the controller can acquire the weld seam and the outline of the pole in the weld seam image, acquire the first position of the center point of the weld seam based on the weld seam image, acquire the second position of the center point of the outline of the pole based on the weld seam image, and use the offset of the first position and the second position as the actual offset of the weld seam relative to the outline of the pole.

[0124] refer to Figure 5 The actual offset may include: the center point O1 of weld 21 and the center point O2 of the outline of electrode 20, and the first actual offset in the cell width direction X. Figure 5 (not shown), and a second actual offset D in the cell length direction Y.

[0125] It should be noted that, Figure 5 This is a schematic diagram where the first actual offset is 0, therefore the first actual offset is not marked.

[0126] The controller can establish a two-dimensional target coordinate system xy with the target point in the weld image as the origin. The target point of this target coordinate system xy can be the center point O2 of the electrode profile. The first axis x of this target coordinate system xy is parallel to the cell width direction X, and the second axis y is parallel to the cell length direction Y. The controller can use the difference between the coordinates on the first axis x at the first position and the coordinates on the first axis x at the second position as the first actual offset, and the difference between the coordinates on the second axis y at the first position and the coordinates on the second axis y at the second position as the second actual offset. This yields the actual offset.

[0127] The target coordinate system xy includes four quadrants: the first quadrant formed by the positive direction of the first axis x and the positive direction of the second axis y; the second quadrant formed by the negative direction of the first axis x and the positive direction of the second axis y; the third quadrant formed by the negative direction of the first axis x and the negative direction of the second axis y; and the fourth quadrant formed by the positive direction of the first axis x and the negative direction of the second axis y.

[0128] The center point O1 of weld 21 may be located in any of the four quadrants, and the signs of the first actual offset and the second actual offset may be different depending on which quadrant the center point O1 of weld 21 is located in.

[0129] In another optional implementation of this application embodiment, the controller can obtain a first position of the center point of the weld, obtain a third position of the pole profile, and use the offset between the first and third positions as the actual offset of the weld relative to the pole profile. The third position can be the position of a reference point on the pole profile.

[0130] The actual offset may include the center point of the weld and a reference point on the outline of the electrode post, a third actual offset in the cell width direction, and a fourth actual offset in the cell length direction.

[0131] The controller can use the difference between the coordinates on the first axis in the first position and the coordinates on the first axis in the third position as the third actual offset, and use the difference between the coordinates on the second axis in the first position and the coordinates on the second axis in the third position as the fourth actual offset.

[0132] In this embodiment, the controller captures the high-precision spatial coordinates of the relative position of the weld and the pole profile to ensure the accuracy and consistency of the actual offset obtained, avoiding human judgment errors, thereby providing a reliable data source for correction.

[0133] Step 209: Check whether the difference between the actual offset and the standard offset is outside the range of the difference.

[0134] If the difference between the actual offset and the standard offset is outside the acceptable range, the controller can determine that the deviation of the weld seam from the pole's profile is significant, and therefore can proceed to step 210. For example, from Figure 5 It can be seen that weld 21 deviates from the standard weld 10, and the deviation of weld 21 from the contour of pole post 20 is relatively large. When the difference between the actual offset and the standard offset is within the range of the difference, the controller can determine that the deviation of the weld from the contour of pole post is small, and therefore step 211 can be executed.

[0135] When the actual offset includes a first actual offset and a second actual offset, and the standard offset includes a first standard offset and a second standard offset, the difference range can include a first range and a second range. If the difference between the first actual offset and the first standard offset is outside the first range, and / or the difference between the second actual offset and the second standard offset is outside the second range, the controller can determine that the difference between the actual offset and the standard offset is outside the difference range. If the difference between the first actual offset and the first standard offset is within the first range, and the difference between the second actual offset and the second standard offset is within the second range, the controller can determine that the difference between the actual offset and the standard offset is within the difference range.

[0136] In one implementation, the center point of the weld coincides with the center point of the pole profile, meaning both the first and second actual offsets are 0. However, within the allowable error range, the center point of the weld can deviate from the center point of the pole profile by a certain distance, and the center point of the weld can be located in any quadrant of the target coordinate system. Therefore, it can be set that when the difference between the first actual offset and the first standard offset is within a first range, and the difference between the second actual offset and the second standard offset is within a second range, the weld is located at the center of the pole profile.

[0137] The lower limit of the first range and the lower limit of the second range can both be negative numbers, while the upper limit of the first range and the upper limit of the second range can both be positive numbers.

[0138] When the actual offset includes a third actual offset and a fourth actual offset, and the standard offset includes a third standard offset and a fourth standard offset, the difference range may include a third range and a fourth range. If the difference between the third actual offset and the third standard offset is outside the third range, and / or the difference between the fourth actual offset and the fourth standard offset is outside the fourth range, the controller can determine that the difference between the actual offset and the standard offset is outside the difference range. If the difference between the third actual offset and the third standard offset is within the third range, and the difference between the fourth actual offset and the fourth standard offset is within the fourth range, the controller can determine that the difference between the actual offset and the standard offset is within the difference range.

[0139] In this embodiment, if the difference between the actual offset and the standard offset is outside the range of the difference, and the absolute value of the difference is greater than a preset value, it can be determined that the deviation of the weld seam from the pole's contour is large, and even if the first welding parameter is compensated, the difference cannot be corrected to the range of the difference. Therefore, the battery module can be removed from the workstation, i.e., the following steps do not need to be performed, thereby avoiding welding quality risks. If the absolute value of the difference is greater than a preset value, it can be determined that the difference can be corrected to the range of the difference by compensating the first welding parameter, and therefore step 211 can be performed.

[0140] Step 210: Compensate the first welding parameters of the first welding equipment based on the actual offset.

[0141] If the difference between the actual offset and the standard offset is outside the range of the difference, the controller can determine that the deviation of the weld seam from the pole post contour is large. Therefore, the controller can compensate the first welding parameters of the first welding equipment based on the actual offset. Then, the controller can execute step 207 again so that the first welding equipment welds the pole post again according to the compensated first welding parameters. This makes the difference between the actual offset of the weld seam formed on the pole post and the standard offset within the range of the difference, thereby achieving automatic correction.

[0142] Optionally, the controller can adjust the deflection angle of the galvanometer in the first welding parameters based on the actual offset, thereby compensating for the first welding parameters and obtaining the compensated first welding parameters. By adjusting the deflection angle of the galvanometer, the direction of the laser beam emitted by the first welding equipment is adjusted, compensating for deviations during the welding process. At the same time, dynamic adjustment of the laser beam direction is achieved, enabling precise compensation of the electrode welding trajectory in the battery cell, completely eliminating manual intervention and reducing the product scrap rate to 0 (e.g., product scrap caused by the weld seam exceeding the electrode contour).

[0143] In one alternative implementation, the controller may also increase the first welding power in the first welding parameters, thereby forming a deeper weld on the pole.

[0144] When forming a weld for the first time on the pole post, since the weld may deviate from the center of the pole post's outline, a lower welding power can be used to form the weld. However, by compensating for the first welding parameters, simultaneously increasing the first welding power within the first welding parameters ensures both accurate weld positioning and weld quality, preventing quality problems caused by weld positional deviations when forming the weld with higher power.

[0145] In another alternative implementation, if the difference between the actual offset and the standard offset is within the range of the difference, the controller can obtain the third welding parameters and control the first welding equipment to weld the terminals of the battery cell according to the third welding parameters.

[0146] In this embodiment, the controller can update the first welding power in the compensated first welding parameters to the third welding power to obtain the third welding parameters.

[0147] The third welding power is greater than the first welding power. Optionally, the difference between the third welding power and the first welding power is less than or equal to a preset threshold.

[0148] When the difference between the actual offset and the standard offset is within the range of the difference, using a larger third welding power to form a weld on the pole can ensure the accuracy of the weld position and the quality of the weld, preventing quality problems caused by weld position deviation when using a larger power to form a weld.

[0149] Step 211: Control the first welding equipment to align with the first pole post.

[0150] If the difference between the actual offset and the standard offset is within the acceptable range, the controller can determine that the deviation of the weld seam from the pole post's contour is small. Therefore, it can control the first welding equipment to align with the first pole post and execute step 207 again. The first pole post is welded after the pole post in the welding sequence, and this pole post is the one welded in steps 207 to 210.

[0151] When the difference between the actual offset and the standard offset for each of the multiple terminals is within the specified range, the controller can move the battery module to the component installation station and install CCS components on each terminal of the battery module to which the cell belongs. Then, the battery module is moved to the second welding chamber, and the second welding equipment is controlled to weld the CCS components covering each terminal according to the second welding parameters, thereby forming weld seams on the CCS components.

[0152] When the difference between the actual offset and the standard offset of each terminal in the multiple terminals is within the range of the difference, the controller can determine that the deviation of the weld seam of each terminal in the battery module from the outline of the terminal is small. Therefore, CCS components can be installed on each terminal. Then, the second welding equipment is controlled to weld the CCS components covering each terminal according to the second welding parameters to form a weld seam on the CCS components.

[0153] In this design, the second welding power in the second welding parameter is greater than the first welding power, meaning that high-power welding is used. This CCS module is used to connect battery cells in series, ensuring that all welding parameters and quality meet standards, further improving the reliability and consistency of the manufactured products. The aluminum bars (aluminum connecting pieces) on the CCS module tightly cover the battery cell terminals, ensuring that the welding position on the CCS module is aligned with the geometric center of the terminals.

[0154] In some embodiments of this application, when the weld morphology on each CCS component conforms to a preset morphology, the controller can move the battery module to the cleaning station and control the cleaning equipment to clean the open areas of each cell in the battery module. If the weld morphology on at least one CCS component does not conform to the preset morphology, the controller can determine that there is a problem with the welding quality of the CCS module and therefore can issue a second alarm message. This second alarm message is used to indicate that the battery module does not meet the requirements and needs to be removed from the station.

[0155] The preset form may include at least one of the following:

[0156] The width of the weld on the CCS component is within the first numerical range;

[0157] The depth of the weld on the CCS component is within the second numerical range;

[0158] The CCS components were not damaged.

[0159] The weld seam on the CCS module can be either circular or quadrilateral. When the weld seam on the CCS module is circular, the width of the weld seam refers to the circumference of the weld. The depth of the weld seam is perpendicular to the bottom surface of the housing.

[0160] In this embodiment, the window area refers to a partial window on the top surface of the battery cell that is not fully encapsulated. The outer layer (nylon layer) and inner layer (heat-sealing layer) of the aluminum-plastic film in this window area are removed, exposing the intermediate aluminum layer. This window area can be used to achieve electrical connections.

[0161] After cleaning the window opening area, adhesive can be applied to the cleaned area, and then a pressure strip can be installed at the adhesive-coated location.

[0162] The controller can control the fourth image acquisition device to take pictures of the CCS component, obtain a surface image of the CCS component, and then identify the shape of the CCS component based on the surface image.

[0163] If the difference between the actual offset and the standard offset is outside the acceptable range, the controller compensates for the first welding parameters of the first welding equipment based on the actual offset and welds the pole again. Step 208 is then executed again to confirm the correction effect, thus establishing a complete closed-loop process, ensuring the reliability of the correction results, and preventing false or missed corrections. Furthermore, if the difference between the actual offset and the standard offset for each pole is within the acceptable range, CCS components are installed on each pole, and the CCS components covering the pole are welded. This ensures the accuracy of the weld position on the pole and effectively prevents welding quality problems caused by weld trajectory deviation on the pole during high-power welding.

[0164] In related technologies, the manual correction process is time-consuming (e.g., at least eight hours), resulting in low efficiency and requiring a large number of personnel. Automation levels are low, relying mainly on human experience for correction, making the results susceptible to human fatigue. Manual correction is prone to occasional weld misalignment issues, easily leading to defective products. For example, manual correction errors may cause welding to puncture the sealing ring, rendering the battery module unusable.

[0165] The method provided in this application significantly reduces correction time (e.g., less than 1 hour), greatly improving work efficiency and significantly reducing the required personnel. Its high level of automation reduces reliance on human experience, minimizes human error, and makes correction results more stable and reliable. Furthermore, it reduces defects caused by weld misalignment to zero, drastically lowering the defect rate and greatly improving product quality and yield in the production process. The method provided in this application can adapt to different weld types, thus demonstrating strong adaptability.

[0166] If the difference between the actual offset and the standard offset for each of the multiple poles is within the acceptable range, the correction effect can be manually verified. If the manual verification confirms a good correction effect, a CCS component can be installed on each pole, and a welding command can be triggered via a display device. Upon receiving the manually triggered welding command, the controller can confirm a good correction effect and, in response, use a second welding device to weld the CCS component covering the pole according to the second welding parameters to form a weld on the CCS component. For example, the weld can be manually verified to ensure it is centered on the pole's outline.

[0167] In summary, this application provides a welding control method for battery cells. In this method, after the controller welds the electrode post of the battery cell using a first welding device according to first welding parameters, it can acquire a weld image of the weld seam in the electrode post. Based on the weld image, it obtains the actual offset of the weld seam relative to the electrode post's contour. Then, if the difference between the actual offset and the standard offset is outside the acceptable range, it automatically compensates for the first welding parameters of the first welding device based on the actual offset, thereby achieving automatic weld seam correction. Compared to related technologies, the method provided in this application is not affected by subjective human factors, improving the accuracy of judging whether the deviation of the weld seam relative to the electrode post's contour is large. It also improves the accuracy of compensating for the first welding parameters of the first welding device, enhancing the accuracy of weld seam correction, and thus improving the reliability of welding control.

[0168] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the cell welding control method described in the above embodiments.

[0169] Figure 6 This is a schematic diagram of the structure of a controller provided in an embodiment of this application, such as... Figure 6 As shown, the control 60 may include a memory 601, a processor 602, and a computer program stored in the memory 601 and capable of running on the processor 602. When the processor executes the computer program, it implements the cell welding control method described in the above embodiments.

[0170] Figure 7 This is a block diagram of a welding control device for a battery cell provided in an embodiment of this application, such as... Figure 7 As shown, the device includes:

[0171] The first acquisition module 701 is used to acquire the standard offset of the standard weld relative to the outline of the standard pole in the weld template image.

[0172] The control module 702 is used to control the first welding equipment to weld the electrode posts of the battery cell according to the first welding parameters;

[0173] The second acquisition module 703 is used to acquire the weld image of the weld in the pole post;

[0174] The third acquisition module 704 is used to acquire the actual offset of the weld relative to the pole post based on the weld image;

[0175] The compensation module 705 is used to compensate the first welding parameters of the first welding equipment based on the actual offset when the difference between the actual offset and the standard offset is outside the range of the difference.

[0176] Optionally, the first welding power in the first welding parameters is less than or equal to the power threshold.

[0177] Optionally, control module 702 is used for:

[0178] Before controlling the first welding equipment to weld the terminals of the battery cell according to the first welding parameters, the method further includes:

[0179] If the battery module to which the cell belongs meets the welding requirements, the battery module is moved to the first welding room;

[0180] If the battery module to which the cell belongs does not meet the welding requirements, the first alarm message will be issued.

[0181] Optionally, the battery module includes multiple battery cells; the control module 702 is used for:

[0182] If the terminals of multiple cells meet the preset conditions, the battery module is determined to meet the welding requirements.

[0183] If at least one cell's terminal does not meet the preset conditions, the battery module is determined to not meet the welding requirements.

[0184] The preset conditions include at least one of the following:

[0185] At least two target poles, the spacing between any two adjacent target poles in the cell width direction is within a first preset range, and the cells to which the at least two target poles belong are arranged along the cell width direction;

[0186] The distance between any two target terminals along the length of the cell is within a second preset range;

[0187] The height of each target pole is within the third preset range.

[0188] Optionally, control module 702 is used for:

[0189] Before testing whether the battery module to which the battery cell belongs meets the welding requirements, the cleaning equipment is used to clean each terminal in the battery module.

[0190] Optionally, control module 702 is used for:

[0191] Before the cleaning equipment cleans each terminal in the battery module, a low-voltage insulation test is performed on the battery module.

[0192] After the low-voltage insulation test of the battery module is passed, the cleaning equipment is controlled to clean each terminal in the battery module.

[0193] Optionally, control module 702 is used for:

[0194] When the difference between the actual offset and the standard offset of each of the multiple terminals is within the range of the difference, CCS components are installed on each terminal in the battery module to which the cell belongs.

[0195] Optionally, control module 702 is used for:

[0196] After installing CCS components on each terminal post in the battery module to which the battery cell belongs, the battery module is moved to the second welding room.

[0197] The second welding equipment is controlled to weld the CCS components covering each pole according to the second welding parameters, so as to form welds on the CCS components.

[0198] In this case, the second welding power in the second welding parameter is greater than the first welding power in the first welding parameter.

[0199] Optionally, the control module 702 is used for:

[0200] With the weld seam morphology on each CCS component meeting the preset requirements, the battery module is moved to the cleaning station, and the cleaning equipment is controlled to clean the window area of ​​each cell in the battery module.

[0201] If the weld morphology on at least one CCS component does not meet the preset requirements, a second alarm message will be issued.

[0202] Optionally, the third acquisition module 704 is used for:

[0203] Obtain the weld seam and the outline of the pole in the weld seam image;

[0204] Based on the weld image, obtain the first position of the center point of the weld;

[0205] Based on the weld image, obtain the second position of the center point of the pole's profile;

[0206] The offsets of the first and second positions are taken as the actual offsets of the weld relative to the profile of the pole post.

[0207] Optionally, the third acquisition module 704 is used for:

[0208] Obtain the weld seam and the outline of the pole in the weld seam image;

[0209] Obtain the first position of the center point of the weld;

[0210] Obtain the third position of the pole's outline;

[0211] The offsets of the first and third positions are taken as the actual offsets of the weld relative to the profile of the pole post.

[0212] In summary, this application provides a welding control device for a battery cell. After the first welding equipment welds the electrode post of the battery cell according to the first welding parameters, the device can acquire a weld image of the weld seam in the electrode post. Based on the weld image, it obtains the actual offset of the weld seam relative to the contour of the electrode post. Then, if the difference between the actual offset and the standard offset is outside the range of the difference, it automatically compensates the first welding parameters of the first welding equipment based on the actual offset, thereby achieving automatic correction of the weld seam. Compared with related technologies, the method provided by this application is not affected by human subjective factors, improves the accuracy of judging whether the deviation of the weld seam relative to the contour of the electrode post is large, improves the accuracy of compensation of the first welding parameters of the first welding equipment, improves the accuracy of correction, and thus improves the reliability of welding control.

[0213] This application also provides a welding system, which may include a first welding device and the controller described in the above embodiments.

[0214] 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 welding control method of an electric chip, characterized by, The method comprises: obtaining a standard offset of a standard weld relative to a contour of a standard pole in a weld template image; controlling a first welding device to weld the poles of the battery cell according to first welding parameters in a first welding room; obtaining a weld image of the weld in the pole; based on the weld image, obtaining an actual offset of the weld relative to the contour of the pole; in the case that the difference between the actual offset and the standard offset is outside the difference range, compensating the first welding parameters of the first welding device based on the actual offset; in the case that the difference between the actual offset and the standard offset of each of the poles in the battery module is within the difference range, installing a CCS assembly on each of the poles in the battery module; moving the battery module to a second welding room and controlling a second welding device to weld the CCS assembly covering each of the poles according to second welding parameters to form a weld on the CCS assembly; in the case that the morphology of the weld on each of the CCS assemblies meets the preset morphology, moving the battery module to a cleaning station and controlling a cleaning device to clean the windowed area of each of the battery cells in the battery module; wherein the preset morphology includes at least one of the following: the width of the weld on the CCS assembly is within a first numerical range; the depth of the weld on the CCS assembly is within a second numerical range; the CCS assembly does not appear damaged; before detecting whether the battery module to which the battery cell belongs meets the welding requirement, the method further comprises: controlling a cleaning device to clean each of the poles in the battery module; in the case that the battery module to which the battery cell belongs meets the welding requirement, moving the battery module to the first welding room.

2. The method of claim 1, wherein, before controlling the first welding device to weld the poles of the battery cell according to the first welding parameters, the method further comprises: in the case that the battery module to which the battery cell belongs does not meet the welding requirement, issuing a first alarm information.

3. The method of claim 2, wherein, The battery module comprises a plurality of battery cells; the method further comprises: in the case that the poles of each of the battery cells meet the preset condition, determining that the battery module meets the welding requirement; in the case that the poles of at least one of the battery cells do not meet the preset condition, determining that the battery module does not meet the welding requirement; wherein the preset condition includes at least one of the following: in at least two target poles, every two adjacent target poles have a spacing in the battery cell width direction within a first preset range, and the battery cells to which the at least two target poles belong are arranged along the battery cell width direction; any two target poles have a spacing in the battery cell length direction within a second preset range; the height of each target pole is within a third preset range.

4. The method according to any one of claims 1 to 3, characterized in that, before controlling the cleaning device to clean each of the poles in the battery module, the method further comprises: performing a low-voltage insulation test on the battery module; controlling the cleaning device to clean each of the poles in the battery module, comprising: If the low-voltage insulation test of the battery module passes, the cleaning equipment is controlled to clean each of the terminals in the battery module.

5. The method according to any one of claims 1 to 3, characterized in that, wherein, The second welding power in the second welding parameter is greater than the first welding power in the first welding parameter.

6. The method according to any one of claims 1 to 3, characterized in that, The method further includes: If the weld shape on at least one of the CCS components does not conform to the preset shape, a second alarm message is issued.

7. The method according to any one of claims 1 to 3, characterized in that, The step of obtaining the actual offset of the weld relative to the contour of the pole based on the weld image includes: Obtain the weld seam and the outline of the pole in the weld seam image; Based on the weld image, obtain the first position of the center point of the weld; Based on the weld image, obtain the second position of the center point of the pole's outline; The offsets of the first and second positions are taken as the actual offsets of the weld relative to the profile of the pole post.

8. The method according to any one of claims 1 to 3, characterized in that, The step of obtaining the actual offset of the weld relative to the contour of the pole based on the weld image includes: Obtain the weld seam and the outline of the pole in the weld seam image; Obtain the first position of the center point of the weld; Obtain the third position of the outline of the pole post; The offsets of the first position and the third position are taken as the actual offsets of the weld relative to the profile of the pole post.

9. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the welding control method for the battery cell according to any one of claims 1-8.

10. A controller characterized by comprising: The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the welding control method for the battery cell according to any one of claims 1-8.

11. A welding system for an electrical cell, characterized by The welding system includes: a first welding device and a controller as described in claim 10.

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