Mylar film welding method and device and electronic equipment

Abstract

The embodiment of the invention provides a Mylar film welding method and device and electronic equipment, and belongs to the technical field of battery manufacturing. The method comprises the steps that edge features of a Mylar film and an object to be welded are obtained, and the position between the Mylar film and the object to be welded is adjusted according to the edge features, so that the Mylar film is aligned with the object to be welded; ultrasonic welding is conducted on the Mylar film and at least one preset area of the to-be-welded object, so that the Mylar film and the to-be-welded object are connected in a welded mode through the at least two preset areas; welding quality information of each preset area on the Mylar film is obtained, at least one piece of welding quality information is obtained, and the welding quality information comprises at least one of the welding power ratio and the effective welding area; and obtaining a welding result of the Mylar film according to the at least one piece of welding quality information. According to the method, the accuracy of judging the welding effect of the Mylar membrane can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a Mylar film welding method, device and electronic equipment. Background Art

[0002] Mylar film plays an important role in the production process of square power and energy storage batteries. Mylar film is usually firmly wrapped on the outer surface of the battery cell through hot-melt technology, forming an effective barrier to isolate the external environment and protect the battery cell structure.

[0003] In the prior art, it is usually performed manually to visually inspect whether there are defects in the welding area of ​​the Mylar film, and then determine the welding effect of the Mylar film.

[0004] However, existing welding effect determination methods are easily affected by subjective factors, resulting in low inspection accuracy. Summary of the invention

[0005] The embodiments of the present application provide a Mylar film welding method, device and electronic equipment, which can improve the accuracy of determining the Mylar film welding effect.

[0006] In a first aspect, an embodiment of the present application provides a Mylar film welding method, comprising:

[0007] Acquire edge features of the Mylar film and the object to be welded, and adjust the position between the Mylar film and the object to be welded according to the edge features so that the Mylar film is aligned with the object to be welded, wherein the object to be welded includes at least one of a battery bottom support sheet and a battery top support;

[0008] Performing ultrasonic welding on at least one preset area of ​​the Mylar film and the object to be welded, so that the Mylar film and the object to be welded are welded and connected through at least two of the preset areas;

[0009] Acquire welding quality information of each of the preset areas on the Mylar film to obtain at least one of the welding quality information, wherein the welding quality information includes at least one of a welding power ratio and an effective welding area;

[0010] The welding result of the Mylar film is obtained according to at least one of the welding quality information.

[0011] In a possible implementation manner, adjusting the position between the Mylar film and the object to be welded according to the edge feature includes:

[0012] Acquire characteristic points of the Mylar film and the object to be welded according to the edge features, wherein the characteristic points include at least one of a center point and a corner point;

[0013] Obtaining a relative position deviation between the Mylar film and the object to be welded according to the characteristic points of the Mylar film and the object to be welded;

[0014] The position between the Mylar film and the object to be welded is adjusted according to the relative position deviation.

[0015] In a possible implementation, the ultrasonic welding of the Mylar film and at least one predetermined area of ​​the object to be welded comprises:

[0016] Acquire the size of the object to be welded, and obtain the size of the Mylar film according to the size of the object to be welded;

[0017] According to the sizes of the object to be welded and the Mylar film, the number of the preset areas on the object to be welded and the Mylar film is obtained, and the number of the preset areas is greater than or equal to two;

[0018] Ultrasonic welding is performed on the object to be welded and at least one of the preset areas on the Mylar film.

[0019] In a possible implementation manner, the acquiring welding quality information of each of the preset areas on the Mylar film to obtain at least one piece of welding quality information includes:

[0020] For each of the preset areas on the Mylar film, obtaining a welding power ratio of the preset area during ultrasonic welding;

[0021] For each of the preset areas on the Mylar film, obtaining an effective welding area of ​​the preset area after ultrasonic welding;

[0022] At least one piece of welding quality information is obtained according to the welding power ratio and the effective welding area of ​​each preset area.

[0023] In a possible implementation manner, obtaining the welding power ratio of the preset area during ultrasonic welding includes:

[0024] Obtaining welding current and welding voltage of the preset area during ultrasonic welding;

[0025] According to the welding current and the welding voltage, an actual welding power of the preset area during ultrasonic welding is obtained;

[0026] The welding power ratio is obtained according to the ratio between the actual welding power and the preset welding power.

[0027] In a possible implementation manner, obtaining the effective welding area of ​​the preset area after ultrasonic welding includes:

[0028] Performing edge detection on the preset area after ultrasonic welding to obtain an edge detection result;

[0029] According to the edge detection result, the contour of the welding area is obtained;

[0030] The effective welding area is obtained according to the contour of the welding region.

[0031] In a possible implementation manner, obtaining the welding result of the Mylar film according to at least one welding quality information includes:

[0032] For each of the preset areas on the Mylar film, determining whether the welding power ratio of the preset area is within a preset range, and if so, continuing to determine whether the effective welding area of ​​the preset area is greater than a preset threshold, and if so, the preset area is determined to be a normal preset area;

[0033] If the welding power ratio of the preset area exceeds the preset range, or the effective welding area of ​​the preset area is smaller than the preset threshold, or the welding power ratio of the preset area exceeds the preset range and the effective welding area of ​​the preset area is smaller than the preset threshold, the preset area is determined to be an abnormal preset area;

[0034] The number of the normal preset areas in all the preset areas on the Mylar film is obtained, and the welding result of the Mylar film is obtained according to the number of the normal preset areas.

[0035] In a possible implementation manner, obtaining the welding result of the Mylar film according to the number of the normal preset areas includes:

[0036] Obtaining a ratio of the number of the normal preset area to the number of all preset areas;

[0037] When the quantity ratio is greater than or equal to a preset value, it is determined that the welding result of the Mylar film is normal.

[0038] In a second aspect, an embodiment of the present application provides a Mylar film welding device, comprising:

[0039] an acquisition module, for acquiring edge features of the Mylar film and the object to be welded, and adjusting the position between the Mylar film and the object to be welded according to the edge features so that the Mylar film and the object to be welded are aligned, wherein the object to be welded includes at least one of a bottom support sheet and a top support;

[0040] A welding module, used for ultrasonically welding the Mylar film and at least one preset area of ​​the object to be welded, so that the Mylar film and the object to be welded are welded and connected through at least two of the preset areas;

[0041] The acquisition module is further used to acquire welding quality information of each of the preset areas on the Mylar film to obtain at least one of the welding quality information, wherein the welding quality information includes at least one of a welding power ratio and an effective welding area;

[0042] An execution module is used to obtain a welding result of the Mylar film according to at least one welding quality information.

[0043] In a third aspect, an embodiment of the present application provides a Mylar film welding device, comprising: a processor, and a memory communicatively connected to the processor;

[0044] The memory stores computer-executable instructions;

[0045] The processor executes the computer-executable instructions stored in the memory, so that the processor executes the above first aspect and / or various possible implementations of the first aspect.

[0046] The Mylar film welding method, device and electronic device provided in the embodiment of the present application obtain the edge features of the Mylar film and the object to be welded, and automatically adjust the position between the Mylar film and the object to be welded according to these edge features, so that the Mylar film and the object to be welded are accurately aligned, thereby ensuring accurate positioning during the welding process. In addition, by ultrasonically welding the preset areas of the Mylar film and the object to be welded, and obtaining the welding quality information of each preset area (including welding power ratio and effective welding area, etc.), the quality status of the welding process can be monitored in real time, ensuring the consistency and reliability of the welding effect judgment, avoiding the influence of subjective factors in manual visual inspection, and improving the accuracy of the judgment of the Mylar film welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0048] Figure 1 System architecture diagram provided for this application;

[0049] Figure 2 Schematic diagram of the Mylar film welding method provided in this application Figure 1 ;

[0050] Figure 3 Schematic diagram of the Mylar film welding method provided in this application Figure 2 ;

[0051] Figure 4 Schematic diagram of the Mylar film welding method provided in this application Figure 3 ;

[0052] Figure 5 A graph showing the relationship between welding power and welding time for the Mylar film provided in this application;

[0053] Figure 6 Actual welding diagram of Mylar film provided for this application;

[0054] Figure 7 This is a schematic diagram of the structure of the Mylar film welding equipment provided in this application.

[0055] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0056] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0057] Mylar film is a polyester film (Polyethylene Terephthalate, PET), a very thin plastic film known for its excellent electrical insulation properties, thermal stability, chemical stability and mechanical strength. Mylar film is usually very transparent and has good dimensional stability and durability.

[0058] In the manufacturing process of batteries, Mylar film can be used to wrap individual cells. Cells are the basic units of lithium-ion batteries, including positive electrodes, negative electrodes, electrolytes and separators. Mylar film can be used as a protective layer or as a logo to help distinguish different cells.

[0059] Mylar film can also be used for battery packaging or isolation of internal components. For example, in the design of some soft-pack batteries, Mylar material may be used to enhance the stability of the battery structure and prevent short circuits caused by direct contact of internal components. As a material with good waterproof properties, Mylar film can also effectively prevent moisture from invading the interior of the battery, thereby avoiding performance degradation or failure of the battery cell caused by moisture. By welding the Mylar film to the bottom support and top bracket of the battery, additional mechanical support can be provided to the battery cell, ensuring the stable position of the battery cell in the battery pack and reducing displacement caused by vibration or collision.

[0060] In the prior art, the welding area of ​​the Mylar film is usually manually visually inspected to see if there are defects, and then the welding effect of the Mylar film is determined. However, the existing welding effect determination method is easily affected by subjective factors, resulting in low inspection accuracy.

[0061] The Mylar film welding method provided in the embodiment of the present application obtains the edge features of the Mylar film and the object to be welded, and automatically adjusts the position between the Mylar film and the object to be welded according to these edge features, so that the Mylar film and the object to be welded are accurately aligned, thereby ensuring accurate positioning during the welding process. In addition, by ultrasonically welding the preset areas of the Mylar film and the object to be welded, and obtaining the welding quality information of each preset area (including welding power ratio and effective welding area, etc.), the quality status of the welding process can be monitored in real time, ensuring the consistency and reliability of the welding effect, avoiding the influence of subjective factors in manual visual inspection, and improving the accuracy of judging the welding effect of the Mylar film.

[0062] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0063] Figure 1 The system architecture diagram provided for this application is as follows: Figure 1As shown, the Mylar film welding system of the present application includes an acquisition module 100, a data processing module 200, a control module 300, a position adjustment module 400, a welding module 500, and an execution module 600. The acquisition module 100 is used to acquire the edge features of the Mylar film and the object to be welded (such as the battery bottom bracket and the top bracket) to determine the edge position of the Mylar film and the object to be welded, and provide a basis for the subsequent position adjustment of the Mylar film and the object to be welded. The acquisition module 100 is also used to collect welding quality information (such as welding power ratio and effective welding area) of each preset area on the Mylar film during the welding process, and pass these data to the data processing module 200. The data processing module 200 is used to process the edge feature information provided by the acquisition module 100, calculate the relative position deviation between the Mylar film and the object to be welded, and provide data support for the position adjustment module 400. The data processing module 200 is also used to receive the welding quality information transmitted by the acquisition module 100 and process it. The processing content includes but is not limited to data cleaning, format conversion, statistical analysis, etc., to ensure that the data can be effectively used. The control module 300 is used to ensure that the entire welding process is carried out according to a predetermined procedure, and the welding accuracy is ensured by controlling the actions of each module. The control module 300 controls the operation of the position adjustment module 400 and the welding module 500 according to the information provided by the data processing module 200. The position adjustment module 400 can adjust the position between the Mylar film and the object to be welded according to the instructions of the control module 300 so that they are accurately aligned. The welding module 500 can perform ultrasonic welding on the preset area of ​​the Mylar film and the object to be welded. Through the ultrasonic welding technology, it is ensured that the Mylar film and the object to be welded are firmly connected in the preset area, thereby improving the welding strength and reliability. The execution module 600 can evaluate the welding results according to the welding quality information provided by the acquisition module 100, and output a qualified / unqualified judgment.

[0064] Figure 2 Schematic diagram of the Mylar film welding method provided in this application Figure 1 ,like Figure 2 As shown, the method includes:

[0065] S201, obtaining edge features of the Mylar film and the object to be welded, adjusting the position between the Mylar film and the object to be welded according to the edge features, so that the Mylar film is aligned with the object to be welded, wherein the object to be welded includes at least one of a battery bottom support sheet and a battery top support sheet.

[0066] Specifically, the battery bottom support usually refers to a planar structural member at the bottom of the battery pack, which is used to support the entire battery pack or battery module, provide mechanical support and protection, and ensure that the battery pack will not be deformed or damaged by external forces during installation and use. The bottom support can also serve as an insulating layer to prevent the bottom of the battery pack from making electrical contact with the vehicle chassis or other metal parts. The battery top support usually refers to a planar structural member on the top of the battery pack, which is used to fix the components inside the battery pack, such as battery cells, cooling plates, etc., and provide mechanical support on the top to ensure that the position of components such as battery cells in the battery pack is stable and reduce displacement caused by vibration or collision. The top support can also serve as an insulating layer to prevent the top of the battery pack from making electrical contact with the top of the vehicle or other metal parts.

[0067] In a possible design, the edge features of the Mylar film and the object to be welded can be obtained through high-resolution industrial cameras, light sources, image processing controllers and other equipment. Then, the feature points of the Mylar film and the object to be welded, including the center point and the corner points, are identified through image processing software, edge detection algorithms, feature point recognition algorithms and other methods. Then, the relative position deviation between the Mylar film and the object to be welded can be calculated based on the feature point data of the Mylar film and the object to be welded. The Mylar film welding system can adjust the position of the Mylar film through the position adjustment module based on the feature point data so that it is aligned with the object to be welded. In addition, the image can be taken again through high-resolution industrial cameras, light sources, image processing controllers and other equipment to confirm whether the Mylar film and the object to be welded are aligned.

[0068] S202, ultrasonically welding the Mylar film and at least one preset area of ​​the object to be welded, so that the Mylar film and the object to be welded are welded and connected through at least two preset areas.

[0069] Specifically, ultrasonic welding refers to a technology that uses high-frequency vibration energy (usually with a frequency of more than 20kHz) to weld two materials (usually plastic or film materials) through the heat generated by friction. During the welding process, no adhesive or flux is needed, but the molecular interaction force of the material itself is relied upon to achieve welding. Ultrasonic welding can be completed in a few seconds, which is faster than the traditional hot melt process (which requires heating and cooling time). In addition, ultrasonic welding generates strong frictional heat between material molecules through high-frequency vibration, forming a molecular-level bond, and the welding strength is higher. Through ultrasonic welding, high-frequency replacement of Teflon and cleaning of the head sealing heating strip can be avoided, and the risk of burns when replacing the heat sealing head and Teflon can also be avoided.

[0070] This application uses ultrasonic welding technology to achieve efficient and high-strength connection between Mylar film and objects to be welded (such as battery bottom bracket and top bracket). Compared with traditional hot melt process, ultrasonic welding has the advantages of fast speed, high strength, clean and environmental protection, low energy consumption and precise control. Ultrasonic welding can also reduce the demand for Teflon, thereby simplifying the process, improving production efficiency and reducing costs.

[0071] S203, obtaining welding quality information of each preset area on the Mylar film to obtain at least one welding quality information, wherein the welding quality information includes at least one of a welding power ratio and an effective welding area.

[0072] It is understandable that by obtaining the welding quality information (including at least one of the welding power ratio and the effective welding area) of each preset area on the Mylar film and making a comprehensive judgment on this information, the welding quality can be ensured. Specifically, through the comprehensive judgment of the welding test results and the visual test results, the product is judged to be qualified only when both test results meet the preset requirements; otherwise, if any test result is unqualified, the product is judged to be unqualified and will be rejected.

[0073] Specifically, Figure 5 As shown, during the ultrasonic welding process, under the premise of a certain energy, the welding power and welding time of the welding module are negatively correlated within a certain range, the optimal energy output time of ultrasonic welding is T1-T2, and the optimal welding power is between P1-P2. Optionally, T1-T2 can be 110ms-130ms. P1-P2 can be 870W-780W.

[0074] Further, within the known optimal energy output time range and the optimal welding power range, different welding powers can be selected for experiments, and the optimal welding power can be obtained by comparison. For example, within the optimal welding power range, the following welding powers can be selected for experiments: 780W, 790W, 800W, 810W, 820W, 830W, 840W, 850W, 860W, and 870W.

[0075] In the specific implementation process, during the ultrasonic welding process, the actual welding power can be obtained in real time and compared with the optimal welding power, and then the welding result can be determined according to the difference between the actual welding power and the optimal welding power. When the difference between the actual welding power and the optimal welding power does not exceed a preset range, the welding power can be considered qualified. Optionally, the preset range can be between ±20%.

[0076] S204, obtaining a welding result of the Mylar film according to at least one welding quality information.

[0077] In the specific implementation process, the welding quality can be determined by analyzing the two key indicators of welding power ratio and effective welding area. First, the actual welding power of each preset area is obtained, and the welding power ratio, that is, the ratio of the actual welding power to the optimal welding power, is calculated; then the effective welding area of ​​each preset area is obtained by visual inspection or image processing technology. For each preset area, if the difference between the actual welding power and the optimal welding power does not exceed the preset range, and the effective welding area is not less than the preset welding area, the welding quality of the preset area is considered to be qualified. If the welding quality information of all preset areas meets the preset standards, or the welding quality information of some preset areas exceeding the preset number meets the preset standards, the welding result of the Mylar film is determined to be qualified. In the above manner, it can be ensured that the welding quality of the Mylar film meets the expected standards, and the detection accuracy of the welding results is improved through real-time monitoring and comprehensive judgment.

[0078] This application obtains the edge features of the Mylar film and the object to be welded, and automatically adjusts the position between the Mylar film and the object to be welded according to these edge features, so that the Mylar film and the object to be welded are accurately aligned, thereby ensuring accurate positioning during the welding process. In addition, by ultrasonically welding the preset areas of the Mylar film and the object to be welded, and obtaining the welding quality information of each preset area (including welding power ratio and effective welding area, etc.), the quality status of the welding process can be monitored in real time to ensure the consistency and reliability of the welding effect, avoid the influence of subjective factors in manual visual inspection, and improve the accuracy of judging the welding effect of the Mylar film.

[0079] Figure 3 Schematic diagram of the Mylar film welding method provided in this application Figure 2 ,like Figure 3 As shown, in this embodiment Figure 2 Based on the embodiment, a process of obtaining edge features of the Mylar film and the object to be welded, adjusting the position between the Mylar film and the object to be welded according to the edge features, and ultrasonically welding the Mylar film and at least one preset area of ​​the object to be welded is described in detail. The method includes:

[0080] S301, obtaining edge features of the Mylar film and the object to be welded.

[0081] In the specific implementation process, a high-resolution industrial camera can be used to capture images of the Mylar film and the object to be welded (such as the bottom bracket or top bracket of the battery). The collected images of the Mylar film and the object to be welded are preprocessed, including grayscale, denoising, contrast enhancement, etc., to improve the effect of subsequent edge detection. The edge features of the Mylar film and the object to be welded are extracted using an image processing algorithm to identify the main contour lines of the Mylar film and the object to be welded.

[0082] S302, acquiring characteristic points of the Mylar film and the object to be welded according to edge features, wherein the characteristic points include at least one of a center point and a corner point.

[0083] In the specific implementation process, based on the extraction of the edge features of the Mylar film and the object to be welded, the key feature points of the Mylar film and the object to be welded are identified using a feature point detection algorithm. For example, the key feature points can be the center point and the corner point. The most significant feature points are selected from all the detected feature points, such as the four corner points of the Mylar film and the four corner points of the object to be welded, and the center point of the Mylar film and the object to be welded can also be identified. The coordinate positions of the above feature points in the image are recorded, such as (X1, Y1), (X2, Y2)... (Xn, Yn).

[0084] S303 , obtaining a relative position deviation between the Mylar film and the object to be welded according to the characteristic points of the Mylar film and the object to be welded.

[0085] In the specific implementation process, the relative position deviation between the Mylar film and the object to be welded is calculated based on the coordinates of the feature points. For example, the distance difference between the four corner points of the Mylar film and the four corner points of the object to be welded is calculated. The position deviation vector of the Mylar film relative to the object to be welded is calculated, including the position deviation vectors (ΔX, ΔY) in the horizontal direction (X axis) and the vertical direction (Y axis). For example, if the coordinates of a corner point of the Mylar film are (X1, Y1), and the corresponding coordinates of the corner point of the object to be welded are (X2, Y2), then the deviation is ΔX=X2-X1, ΔY=Y2-Y1. The position deviations of multiple feature points are summarized, and the average deviation is calculated or the maximum deviation is taken as a reference value.

[0086] S304, adjusting the position between the Mylar film and the object to be welded according to the relative position deviation.

[0087] In the specific implementation process, according to the position deviation of the above-mentioned multiple feature points, the position between the Mylar film and the object to be welded is adjusted by the position adjustment module. After the position is adjusted, the image is taken again to confirm whether the Mylar film is aligned. If it is not aligned, the above adjustment process is repeated until the Mylar film is aligned with the object to be welded.

[0088] S305 , obtaining the size of the object to be welded, and obtaining the size of the Mylar film according to the size of the object to be welded.

[0089] It is understood that in order to ensure the welding effect, the coverage of the Mylar film can be determined according to the size of the object to be welded. By obtaining the size of the object to be welded, it can be ensured that the Mylar film completely covers the object to be welded. If the size of the Mylar film is too small, the edge of the object to be welded will not be completely covered, thereby affecting the welding effect.

[0090] S306 , obtaining the number of preset areas on the object to be welded and the Mylar film according to the sizes of the object to be welded and the Mylar film, wherein the number of preset areas is greater than or equal to two.

[0091] It is understandable that in order to ensure the welding effect between the Mylar film and the object to be welded, multiple preset areas can be set on the object to be welded and the Mylar film for welding, which can ensure uniform distribution of welding, avoid local stress concentration, and improve the overall uniformity of welding. The number and position of the preset areas can be set according to the size of the object to be welded to meet different welding requirements, and this application is not limited here.

[0092] In the specific implementation process, the object to be welded and the Mylar film are divided into several preset areas according to their sizes to ensure uniformity and reliability of welding. The number of preset areas on the object to be welded is at least greater than one, and the number of preset areas on the Mylar film is at least greater than one, to ensure that the object to be welded and the Mylar film can be welded and connected through at least two preset areas.

[0093] S307 , ultrasonically weld the object to be welded and at least one preset area on the Mylar film.

[0094] S308, obtaining welding quality information of each preset area on the Mylar film to obtain at least one piece of welding quality information.

[0095] S309, obtaining a welding result of the Mylar film according to at least one welding quality information.

[0096] Steps S307-S309 and Figure 2 Steps S202 to S204 in the embodiment are similar and will not be described in detail in this embodiment.

[0097] The Mylar film welding method provided in the embodiment of the present application obtains the edge features of the Mylar film and the object to be welded, and adjusts the position between the Mylar film and the object to be welded according to the edge features to ensure the precise alignment of the two; then the size of the Mylar film is determined according to the size of the object to be welded, and on this basis, multiple preset areas are divided for ultrasonic welding to ensure the uniformity and reliability of welding; finally, the welding quality information of each preset area is comprehensively judged to ensure the consistency and stability of the welding effect judgment standard. This not only improves the welding accuracy and avoids local stress concentration, but also enhances the strength and stability of the welding part.

[0098] Figure 4 Schematic diagram of the Mylar film welding method provided in this application Figure 3 ,like Figure 4 As shown, in this embodiment Figure 2 Based on the embodiment, a process of obtaining welding quality information of each preset area on the Mylar film and obtaining a welding result of the Mylar film according to at least one welding quality information is described in detail. The method includes:

[0099] S401, obtaining edge features of the Mylar film and the object to be welded, and adjusting the position between the Mylar film and the object to be welded according to the edge features so that the Mylar film and the object to be welded are aligned.

[0100] S402, ultrasonically welding the Mylar film and at least one preset area of ​​the object to be welded, so that the Mylar film and the object to be welded are welded and connected through at least two preset areas.

[0101] Steps S401-S402 and Figure 2 Steps S201-S202 in the embodiment are similar and will not be described in detail in this embodiment.

[0102] S403 . For each preset area on the Mylar film, obtain a welding power ratio of the preset area during ultrasonic welding.

[0103] In a possible design, obtaining the welding power ratio of a preset area during ultrasonic welding may also include:

[0104] S403a, obtaining the welding current and welding voltage of the preset area during ultrasonic welding.

[0105] Specifically, the acquisition module can monitor the current and voltage in the welding process in real time. For example, the storage data format can be (I1, V1), (I2, V2)... (In, Vn).

[0106] S403b, obtaining the actual welding power of the preset area during ultrasonic welding according to the welding current and the welding voltage.

[0107] Specifically, the actual welding power of the preset area during ultrasonic welding can be obtained according to the product of the acquired real-time current and the real-time voltage.

[0108] S403c. Obtain a welding power ratio according to a ratio between the actual welding power and the preset welding power.

[0109] S404 . For each preset area on the Mylar film, obtain an effective welding area of ​​the preset area after ultrasonic welding.

[0110] In a possible design, obtaining the effective welding area of ​​the preset area after ultrasonic welding may also include:

[0111] S404a, performing edge detection on the preset area after ultrasonic welding to obtain edge detection results.

[0112] S404b, obtaining the contour of the welding area according to the edge detection result.

[0113] S404c, obtaining an effective welding area according to the contour of the welding area.

[0114] S405. For each preset area on the Mylar film, determine whether the welding power ratio of the preset area is within a preset range. If so, execute S406; if not, execute S411.

[0115] It is understandable that during the ultrasonic welding process, due to the accuracy of the equipment, the characteristics of the material and the influence of environmental factors, there may be certain fluctuations in the welding process. Within a certain energy range, there is a relatively stable linear relationship between the welding power and the welding effect. In other words, within a certain power range, the welding effect is predictable. For example, if the preset welding power is 800W, then the actual welding power between 640W and 960W (i.e. 800W±20%) can achieve similar welding effects. By setting a reasonable welding power ratio range, the consistency and reliability of welding can be ensured. Even if the actual welding power fluctuates, as long as it is within the preset range, the welding effect can be considered reliable.

[0116] In one possible design, if the welding power ratio of two consecutive preset areas exceeds the preset range, the Mylar film welding system can alarm or shut down for self-inspection to promptly discover and solve potential problems, prevent the continued production of defective products, and ensure the safe operation of production equipment. The alarm signal can be a sound prompt, a light indication, or a warning message displayed by the Mylar film welding system. After the alarm signal is issued, the Mylar film welding system can automatically stop the welding operation and enter the self-inspection mode. The self-inspection mode can include equipment status check, parameter review, historical data backtracking, etc. For example, check whether the equipment is faulty, whether the parameter settings are correct, and whether the historical welding data is abnormal.

[0117] S406, continue to determine whether the effective welding area of ​​the preset area is greater than the preset threshold, if so, execute S407; if not, execute S411.

[0118] Specifically, the effective welding area refers to the area occupied by the part where the materials are actually tightly bonded after welding. The material molecules in this area form a good connection, achieving the purpose of welding.

[0119] It is understandable that the size of the effective welding area is directly related to the strength and reliability of welding. If the effective welding area is too small, the welding point may not be strong enough and problems may easily occur during use.

[0120] In a possible design, the preset threshold for determining the effective welding area may be 50% of the preset welding area. That is, if the effective welding area of ​​the preset area is greater than 50% of the preset welding area, the welding is considered qualified. The preset welding area can be determined according to the requirements of the product design and the structural characteristics of the welding point, and this application does not limit this.

[0121] Furthermore, if Figure 6 As shown, Figure 6 The left part of the image is a welding effect diagram of a preset area. Figure 6 The right part of is a welding effect diagram of another preset area. When the preset threshold is 50% of the preset welding area, the effective welding areas of the above two preset areas are both greater than 50% of the preset welding area, and it is determined that the effective welding areas of the above two preset areas meet the qualified standards.

[0122] S407: The preset area is determined to be a normal preset area.

[0123] S408 , obtaining the number of normal preset areas among all preset areas on the Mylar film.

[0124] S409: Obtain the ratio of the number of normal preset areas to the number of all preset areas.

[0125] S410: When the quantity ratio is greater than or equal to a preset value, it is determined that the welding result of the Mylar film is normal.

[0126] Optionally, the preset value may be determined based on customer requirements for product quality and production experience, and this application does not limit this. For example, the preset value may be 0.8.

[0127] S411: The preset area is determined to be a non-normal preset area.

[0128] The Mylar film welding method provided in the embodiment of the present application monitors the current and voltage during the welding process in real time, and calculates the ratio between the actual welding power ratio and the preset welding power ratio to ensure that the welding power is within the preset range, thereby ensuring the consistency and reliability of the welding. In addition, by obtaining the effective welding area of ​​each preset area and comparing it with the preset threshold, the strength and reliability of the welding point are ensured. Moreover, by comprehensively determining the welding power ratio and the effective welding area, the welding quality can be evaluated in multiple dimensions. By monitoring the welding power ratio, welding power fluctuations caused by equipment aging, material changes or environmental factors can be discovered and corrected in a timely manner, thereby avoiding welding quality problems caused by unstable welding power. The monitoring of the effective welding area further ensures the actual bonding strength of the welding point, avoiding the situation where the actual welding effect is poor although the welding power meets the requirements. This comprehensive determination method not only improves the accuracy of determining the welding effect of the Mylar film, but also reduces the frequency of human intervention and improves production efficiency through the automatic adjustment and feedback mechanism of the system.

[0129] The Mylar film welding device provided in the embodiment of the present application may include: an acquisition module, a data processing module, a control module, a position adjustment module, a welding module, and an execution module.

[0130] Among them, the acquisition module is used to obtain the edge features of the Mylar film and the object to be welded, and adjust the position between the Mylar film and the object to be welded according to the edge features to align the Mylar film with the object to be welded. The object to be welded includes at least one of a bottom support sheet and a top support.

[0131] The welding module is used to perform ultrasonic welding on at least one preset area of ​​the Mylar film and the object to be welded, so that the Mylar film and the object to be welded are welded and connected through at least two preset areas.

[0132] The acquisition module is also used to acquire welding quality information of each preset area on the Mylar film to obtain at least one welding quality information, wherein the welding quality information includes at least one of a welding power ratio and an effective welding area.

[0133] The execution module is used to obtain the welding result of the Mylar film according to at least one welding quality information.

[0134] In a possible design, the acquisition module is further used to acquire characteristic points of the Mylar film and the object to be welded according to the edge characteristics. The data processing module is used to obtain the relative position deviation between the Mylar film and the object to be welded according to the characteristic points of the Mylar film and the object to be welded. The control module is used to control the position adjustment module to adjust the position between the Mylar film and the object to be welded according to the relative position deviation obtained by the data processing module.

[0135] In a possible design, the acquisition module is further used to acquire the size of the object to be welded, and obtain the size of the Mylar film according to the size of the object to be welded. The data processing module is used to obtain the number of preset areas on the object to be welded and the Mylar film according to the size of the object to be welded and the Mylar film. The control module is used to control the welding module to perform ultrasonic welding on at least one preset area on the object to be welded and the Mylar film according to the number of preset areas.

[0136] In a possible design, the acquisition module is further used to acquire, for each preset area on the Mylar film, a welding power ratio of the preset area during ultrasonic welding, and, for each preset area on the Mylar film, to acquire an effective welding area of ​​the preset area after ultrasonic welding. The data processing module is used to obtain at least one welding quality information according to the welding power ratio and the effective welding area of ​​each preset area.

[0137] In a possible design, the acquisition module is further used to acquire the welding current and welding voltage of the preset area during ultrasonic welding. The data processing module is used to obtain the actual welding power of the preset area during ultrasonic welding according to the welding current and welding voltage, and to obtain the welding power ratio according to the ratio between the actual welding power and the preset welding power.

[0138] In a possible design, the acquisition module is further used to perform edge detection on the preset area after ultrasonic welding to obtain edge detection results. The data processing module is used to obtain the contour of the welding area according to the edge detection results, and obtain the effective welding area according to the contour of the welding area.

[0139] In a possible design, the control module is also used to determine whether the welding power ratio of each preset area on the Mylar film is within a preset range. If so, continue to determine whether the effective welding area of ​​the preset area is greater than a preset threshold. If so, the control execution module determines the preset area as a normal preset area.

[0140] If the welding power ratio of the preset area exceeds the preset range, or the effective welding area of ​​the preset area is smaller than the preset threshold, or the welding power ratio of the preset area exceeds the preset range and the effective welding area of ​​the preset area is smaller than the preset threshold, the control module will control the execution module to determine the preset area as an abnormal preset area.

[0141] The control module can also obtain the number of normal preset areas in the preset areas on the Mylar film through the data processing module, and obtain the welding result of the Mylar film according to the number of normal preset areas.

[0142] In a possible design, the control module is also used to control the data processing module to obtain the quantitative ratio of the normal preset area to the preset area. When the quantitative ratio is greater than or equal to the preset value, the control module can also control the execution module to determine that the welding result of the Mylar film is normal.

[0143] In one possible design, the acquisition module may include a high-resolution industrial camera for capturing images of the Mylar film and the object to be welded, providing high-precision image data. The acquisition module may also include an LED ring light, a backlight, or other types of light sources for illuminating the Mylar film and the object to be welded, ensuring image quality.

[0144] In one possible design, the position adjustment module is mainly used to adjust the position between the Mylar film and the object to be welded to ensure that the two are aligned. For example, the position adjustment module may include a three-dimensional adjustment table to achieve the position adjustment of the Mylar film in the X-axis, Y-axis and Z-axis directions. The position adjustment module may also include a manual fine-tuning knob to fine-tune the position of the Mylar film to assist in alignment. The position adjustment module may also include a cylinder clamp to fix the Mylar film and the object to be welded to prevent movement during the adjustment process.

[0145] In one possible design, the welding module may include a high-frequency vibration welding head, which uses the high-frequency vibration generated by the ultrasonic generator to make the welding head contact with the Mylar film and transfer energy. The welding module may include a support platform for supporting the object to be welded so that it remains stable during the welding process. The welding module may include an electronic controller for controlling the output power and time of the ultrasonic generator to ensure accurate control of welding parameters.

[0146] Figure 7 The schematic diagram of the structure of the Mylar film welding equipment provided in this application. Figure 7 As shown, the Mylar film welding device 70 provided in this embodiment includes: at least one processor 701 and a memory 702. Optionally, the device 70 also includes a communication component 703. The processor 701, the memory 702 and the communication component 703 are connected via a bus 704.

[0147] In a specific implementation process, at least one processor 701 executes the computer-executable instructions stored in the memory 702, so that at least one processor 701 executes the above method.

[0148] The specific implementation process of the processor 701 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment will not be repeated here.

[0149] In the above embodiments, it should be understood that the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the invention can be directly implemented as a hardware processor, or can be implemented by a combination of hardware and software modules in the processor.

[0150] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (NVM), such as at least one disk storage.

[0151] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of this application is not limited to only one bus or one type of bus.

[0152] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0153] The above-mentioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0154] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0155] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0156] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0157] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0158] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0159] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

[0160] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A Mylar film welding method, characterized in that: include: Acquire edge features of the Mylar film and the object to be welded, and adjust the position between the Mylar film and the object to be welded according to the edge features so that the Mylar film is aligned with the object to be welded, wherein the object to be welded includes at least one of a battery bottom support sheet and a battery top support; Performing ultrasonic welding on at least one preset area of ​​the Mylar film and the object to be welded, so that the Mylar film and the object to be welded are welded and connected through at least two of the preset areas; Acquire welding quality information of each of the preset areas on the Mylar film to obtain at least one of the welding quality information, wherein the welding quality information includes at least one of a welding power ratio and an effective welding area; The welding result of the Mylar film is obtained according to at least one of the welding quality information.

2. The Mylar film welding method according to claim 1, characterized in that: The step of adjusting the position between the Mylar film and the object to be welded according to the edge feature comprises: Acquire characteristic points of the Mylar film and the object to be welded according to the edge features, wherein the characteristic points include at least one of a center point and a corner point; Obtaining a relative position deviation between the Mylar film and the object to be welded according to the characteristic points of the Mylar film and the object to be welded; The position between the Mylar film and the object to be welded is adjusted according to the relative position deviation.

3. The Mylar film welding method according to claim 1, characterized in that: The ultrasonic welding of the Mylar film and at least one predetermined area of ​​the object to be welded comprises: Acquire the size of the object to be welded, and obtain the size of the Mylar film according to the size of the object to be welded; According to the sizes of the object to be welded and the Mylar film, the number of the preset areas on the object to be welded and the Mylar film is obtained, and the number of the preset areas is greater than or equal to two; Ultrasonic welding is performed on the object to be welded and at least one of the preset areas on the Mylar film.

4. The Mylar film welding method according to claim 3, characterized in that: The step of acquiring the welding quality information of each of the preset areas on the Mylar film to obtain at least one piece of welding quality information includes: For each of the preset areas on the Mylar film, obtaining a welding power ratio of the preset area during ultrasonic welding; For each of the preset areas on the Mylar film, obtaining an effective welding area of ​​the preset area after ultrasonic welding; At least one piece of welding quality information is obtained according to the welding power ratio and the effective welding area of ​​each preset area.

5. The Mylar film welding method according to claim 4, characterized in that: The obtaining of the welding power ratio of the preset area during ultrasonic welding includes: Obtaining welding current and welding voltage of the preset area during ultrasonic welding; According to the welding current and the welding voltage, an actual welding power of the preset area during ultrasonic welding is obtained; The welding power ratio is obtained according to the ratio between the actual welding power and the preset welding power.

6. The Mylar film welding method according to claim 5, characterized in that: The obtaining of the effective welding area of ​​the preset area after ultrasonic welding comprises: Performing edge detection on the preset area after ultrasonic welding to obtain an edge detection result; According to the edge detection result, the contour of the welding area is obtained; The effective welding area is obtained according to the contour of the welding region.

7. The Mylar film welding method according to claim 6, characterized in that: The step of obtaining the welding result of the Mylar film according to at least one of the welding quality information comprises: For each of the preset areas on the Mylar film, determining whether the welding power ratio of the preset area is within a preset range, and if so, continuing to determine whether the effective welding area of ​​the preset area is greater than a preset threshold, and if so, the preset area is determined to be a normal preset area; If the welding power ratio of the preset area exceeds the preset range, or the effective welding area of ​​the preset area is smaller than the preset threshold, or the welding power ratio of the preset area exceeds the preset range and the effective welding area of ​​the preset area is smaller than the preset threshold, the preset area is determined to be an abnormal preset area; The number of the normal preset areas in all the preset areas on the Mylar film is obtained, and the welding result of the Mylar film is obtained according to the number of the normal preset areas.

8. The Mylar film welding method according to claim 7, characterized in that: The step of obtaining the welding result of the Mylar film according to the number of the normal preset areas comprises: Obtaining a ratio of the number of the normal preset area to the number of all preset areas; When the quantity ratio is greater than or equal to a preset value, it is determined that the welding result of the Mylar film is normal.

9. A Mylar film welding device, characterized in that: include: an acquisition module, for acquiring edge features of the Mylar film and the object to be welded, and adjusting the position between the Mylar film and the object to be welded according to the edge features so that the Mylar film and the object to be welded are aligned, wherein the object to be welded includes at least one of a bottom support sheet and a top support; A welding module, used for ultrasonically welding the Mylar film and at least one preset area of ​​the object to be welded, so that the Mylar film and the object to be welded are welded and connected through at least two of the preset areas; The acquisition module is further used to acquire welding quality information of each of the preset areas on the Mylar film to obtain at least one of the welding quality information, wherein the welding quality information includes at least one of a welding power ratio and an effective welding area; An execution module is used to obtain a welding result of the Mylar film according to at least one welding quality information.

10. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 8.

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