Method and device for determining welding quality of composite current collector and electronic equipment

Abstract

The application provides a composite current collector welding quality determination method and device and electronic equipment. The composite current collector welding quality determination method comprises the following steps: determining the target data characteristics corresponding to the welding target copper foil of the to-be-detected composite current collector according to the roller position data, roller impact force data, roller vibration data, line speed data of the roller welding machine and line speed data of the front and rear pressure rollers in the to-be-detected composite current collector; inputting the target data characteristics into the trained welding quality detection model to determine the target welding quality score of the target copper foil, wherein the trained welding quality detection model is obtained by training the historical data characteristics of the to-be-detected composite current collector welding historical copper foil; and determining whether the welding quality of the target copper foil by the composite current collector is qualified based on the target welding quality score and the preset peak power of the roller welding machine. The application realizes real-time judgment and monitoring of the welding quality of the composite current collector.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical production, in particular to a composite current collector welding quality determination method and device and electronic equipment. BACKGROUND

[0002] Since the composite current collector has better flexibility and mechanical strength, the application of the composite current collector is more and more widely used in the market. However, the folding of the copper foil between the two layers of copper foil and the intermediate layer current collector often occurs during the welding process, or the welding equipment used is also prone to poor welding due to improper welding, so that the welding quality of the composite current collector cannot be judged in real time. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a composite current collector welding quality determination method and device and electronic equipment, which realizes real-time judgment and monitoring of the welding quality of the composite current collector.

[0004] The present application provides a composite current collector welding quality determination method, which comprises the following steps:

[0005] According to the roller position data, roller impact force data, roller vibration data, line speed data of the roller welding machine and line speed data of the front and rear pressure rollers in the composite current collector to be detected, the target data feature corresponding to the welding target copper foil of the composite current collector to be detected is determined;

[0006] The target data feature is input into the trained welding quality detection model to determine the target welding quality score of the target copper foil, wherein the trained welding quality detection model is trained according to the historical data features of the composite current collector to be detected welding historical copper foil;

[0007] Based on the target welding quality score, it is determined whether the welding quality of the composite current collector to the target copper foil is qualified.

[0008] Further, the trained welding quality detection model is determined by the following method:

[0009] According to the historical roller position data, historical roller impact force data, historical roller vibration data, historical line speed data of the roller welding machine and historical line speed data of the front and rear pressure rollers in the composite current collector to be detected, the historical initial data feature corresponding to the welding historical copper foil of the composite current collector to be detected is determined;

[0010] The historical initial data feature is standardized to determine the historical target data feature corresponding to the welding historical copper foil of the composite current collector to be detected.

[0011] inputting the historical target data features into an initial welding quality prediction classifier for model training to determine a trained welding quality detection model.

[0012] Further, the inputting the historical target data features into an initial welding quality prediction classifier for model training to determine a trained welding quality detection model comprises:

[0013] obtaining historical feature labels corresponding to the historical target data features, wherein the historical feature labels are used to represent real historical welding quality scores corresponding to the historical target data features;

[0014] inputting the historical target data features into an initial welding quality prediction classifier for model training to determine predicted historical welding quality scores corresponding to the historical target data features;

[0015] when a loss value between the predicted historical welding quality scores and the real historical welding quality scores is less than a preset threshold, training is stopped, and a trained welding quality detection model is determined.

[0016] Further, the standardization processing comprises noise processing, normalization processing, polynomial processing, and screening processing, and the standardization processing on the historical initial data features to determine historical target data features corresponding to the welding of the composite current collector on historical copper foils comprises:

[0017] noise processing on the historical initial data features to determine historical intermediate data features corresponding to the welding of the composite current collector on historical copper foils;

[0018] normalization processing and polynomial processing on the historical intermediate data features to determine historical standard data features corresponding to the welding of the composite current collector on historical copper foils;

[0019] screening processing on the historical standard data features to determine historical target data features corresponding to the welding of the composite current collector on historical copper foils.

[0020] Further, the determining whether the welding quality of the composite current collector on the target copper foil is qualified based on the target welding quality score comprises:

[0021] determining whether the target welding quality score exceeds a preset welding quality score threshold and determining whether a target peak power corresponding to the welding of the composite current collector on the target copper foil exceeds a preset peak power;

[0022] If the target welding quality score exceeds the preset welding quality score threshold, and the target peak power corresponding to the composite current collector to be detected when welding the target copper foil does not exceed the preset peak power, it is determined that the welding quality of the composite current collector to the target copper foil is qualified.

[0023] If the target welding quality score does not exceed the preset welding quality score threshold, and / or the target peak power corresponding to the composite current collector to be detected when welding the target copper foil exceeds the preset peak power, it is determined that the welding quality of the composite current collector to the target copper foil is unqualified.

[0024] Further, the target peak power corresponding to the composite current collector to be detected when welding the target copper foil is determined by the following method:

[0025] Obtaining the target amplitude and target vibration frequency of the ultrasonic welding head in the seam welder of the composite current collector to be detected;

[0026] According to the target amplitude and the target vibration frequency, the target peak power corresponding to the composite current collector to be detected when welding the target copper foil is determined.

[0027] Further, the method for determining the welding quality of the composite current collector further comprises:

[0028] Judging whether the composite current collector to be detected has been welded during the welding process of the target copper foil;

[0029] If yes, it is determined that the welding quality of the composite current collector to the target copper foil is unqualified.

[0030] The embodiment of the application also provides a device for determining the welding quality of the composite current collector, which comprises:

[0031] A first determining module is configured to determine the target data feature corresponding to the composite current collector to be detected when welding the target copper foil according to the roll wheel position data, roll wheel impact force data, roll wheel vibration data, roll wheel linear speed data and front and rear pressure roller linear speed data of the seam welder in the composite current collector to be detected;

[0032] A second determining module is configured to input the target data feature into a trained welding quality detection model to determine the target welding quality score of the target copper foil, wherein the trained welding quality detection model is trained according to the historical data features of the composite current collector to be detected when welding the historical copper foil;

[0033] A third determining module is configured to determine whether the welding quality of the composite current collector to the target copper foil is qualified based on the target welding quality score and the preset peak power of the seam welder.

[0034] The embodiment of the present application also provides an electronic device, comprising a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, and the machine readable instructions are executed by the processor to perform the steps of the composite current collector welding quality determination method.

[0035] The embodiment of the present application also provides a computer readable storage medium, the computer readable storage medium stores a computer program, and the computer program is executed by the processor to perform the steps of the composite current collector welding quality determination method.

[0036] The composite current collector welding quality determination method, device and electronic device provided by the embodiment of the present application, compared with the prior art, the embodiment provided by the present application inputs the target data features corresponding to the collected composite current collector when welding the target copper foil into the trained welding quality detection model, determines the target welding quality score, and determines whether the welding quality of the composite current collector on the target copper foil is qualified according to the target welding quality score and the preset peak power of the seam welding machine, so that the welding quality of the composite current collector is realized to be judged and monitored in real time.

[0037] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0039] Figure 1 One of the flowcharts of the composite current collector welding quality determination method provided by the embodiment of the present application is shown;

[0040] Figure 2 The second flowchart of the composite current collector welding quality determination method provided by the embodiment of the present application is shown;

[0041] Figure 3 The structural schematic diagram of the overwelding in the composite current collector welding quality determination method provided by the embodiment of the present application is shown;

[0042] Figure 4A structural block diagram of a composite current collector welding quality determination device provided by an embodiment of the application is shown.

[0043] Figure 5 A structural schematic diagram of an electronic device provided by an embodiment of the application is shown.

[0044] In the figure:

[0045] 400 - composite current collector welding quality determination device; 410 - first determination module; 420 - second determination module; 430 - third determination module; 440 - judgment module; 450 - fourth determination module; 500 - electronic device; 510 - processor; 520 - memory; 530 - bus. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and superiorities of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described below in connection with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. The components of the embodiments of the application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments of the application, every other embodiment obtained by a person skilled in the art without creative work falls within the scope of the application.

[0047] First, the application scenarios applicable to the application are introduced. The application can be applied to the technical field of mechanical production.

[0048] It is found through research that, because the composite current collector has better flexibility and mechanical strength, the application of the composite current collector is becoming more and more widespread on the market. However, the folding between the two copper foils in the composite current collector and the intermediate layer current collector often occurs during welding, or the welding equipment used is also prone to poor welding due to improper welding, so the welding quality of the composite current collector cannot be judged in real time.

[0049] Based on this, the embodiments of the application provide a composite current collector welding quality determination method and device and an electronic device, which realize real-time judgment and monitoring of the welding quality of the composite current collector.

[0050] Please refer to Figure 1 , Figure 1 One of the flowcharts of a composite current collector welding quality determination method provided by the embodiments of the application is shown. As shown in Figure 1As shown in the embodiments of the present application, the method for determining the welding quality of the composite current collector provided by the embodiments of the present application comprises the following steps:

[0051] In S101, according to the roller position data, the roller impact force data, the roller vibration data, the line speed data of the roller and the line speed data of the front and rear pressure rollers in the composite current collector to be detected, the target data feature corresponding to the composite current collector to be detected when welding the target copper foil is determined.

[0052] In this step, the roller position fluctuation curve of the roller is generated according to the roller position data in the composite current collector to be detected; the impact force curve is generated according to the roller impact force data; the vibration fluctuation curve is generated according to the roller vibration data; the line speed difference curve of the front and rear pressure rollers is generated according to the line speed data of the front and rear pressure rollers; the line speed difference curve of the roller is generated according to the line speed data of the roller, and then the target data feature corresponding to the composite current collector to be detected when welding the target copper foil is determined according to the above-mentioned pre-determination.

[0053] Here, the roller impact force data is obtained by the grating ruler installed on the upper and lower rollers of the roller, and the grating ruler is used to detect the up and down movement of the roller; the roller impact force data is obtained by the pressure sensor installed below the lower roller or above the upper roller; the roller vibration data is obtained by the high-frequency piezoelectric acceleration sensor installed on the lower roller or the upper roller of the roller, and the acceleration sensor is used to sense and obtain the vibration fluctuation of the lower roller or the upper roller in real time; the line speed data of the roller is obtained by the motor installed at the welding head of the roller (the embodiment of the present application is automatically collected by PLC); the line speed data of the front and rear pressure rollers is obtained by the two rotating motors of the front and rear pressure rollers controlled by PLC.

[0054] The grating ruler, also known as a grating ruler displacement sensor (grating ruler sensor), is a measurement feedback device working on the optical principle of grating. The grating ruler is often applied to the closed-loop servo system of numerical control machine tools and can be used for detecting linear displacement or angular displacement. The signal output by the grating ruler is digital pulse, and the grating ruler has the characteristics of large detection range, high detection precision and fast response speed.

[0055] The acceleration sensor is a sensor capable of measuring acceleration.

[0056] In this way, the composite current collector refers to a structure or part that collects current, mainly refers to metal foils such as copper foils and aluminum foils on lithium ion batteries, and can also include the tab.

[0057] S102, input the target data feature into the trained welding quality detection model to determine the target welding quality score of the target copper foil, wherein the trained welding quality detection model is trained according to the historical data features of the historical copper foil welded by the composite current collector to be detected.

[0058] In this step, the trained welding quality detection model is determined through the following sub-steps:

[0059] Sub-step 1, according to the historical roller position data of the seam welder in the composite current collector to be detected, the historical roller impact force data of the seam welder, the historical roller vibration data of the seam welder, the historical linear velocity data of the seam welder, and the historical linear velocity data of the front and rear pressure rollers, the corresponding historical initial data features of the composite current collector to be detected when welding the historical copper foil are determined.

[0060] In this step, the historical roller position data of the seam welder in the composite current collector to be detected can be collected and obtained in different application scenarios, for example, the historical roller position data in the embodiments provided in the present application can be determined by disassembling the composite current collector to be detected or manually detecting the target copper foil, and then determining whether the welding of each product is qualified and the corresponding historical initial data features.

[0061] Here, the product in the embodiments provided in the present application can be selected according to different application scenarios, assuming that the product in the embodiments provided in the present application is a target copper foil.

[0062] Sub-step 2, standardizing the historical initial data features to determine the historical target data features corresponding to the composite current collector to be detected when welding the historical copper foil.

[0063] In this step, before standardizing the historical initial data features, the historical initial data features are first classified to determine the training set, the validation set and the test set corresponding to the historical initial data features, so as to train the welding quality detection model subsequently.

[0064] Here, the training set and the validation set are used to train the welding quality detection model and to adjust the parameters of the welding quality detection model, therefore, the historical initial data features in the training set and the validation set will be constantly shuffled and randomly generated to avoid constant shuffling of the data model; however, since the historical initial data features in the test set are used to finally verify the effect of the trained welding quality detection model, they will not be changed and shuffled.

[0065] Wherein, sub-step 2 includes the following sub-steps:

[0066] Sub-step 21, noise processing is performed on the historical initial data characteristics, and the historical intermediate data characteristics corresponding to the welding of the composite set fluid on the historical copper foil are determined.

[0067] In this step, noise processing is performed on the historical initial data characteristics by principal component analysis, and the historical intermediate data characteristics corresponding to the welding of the composite set fluid on the historical copper foil are determined.

[0068] Here, principal component analysis aims to use the idea of dimensionality reduction to convert multiple indicators into a few comprehensive indicators to achieve noise reduction.

[0069] In statistics, principal component analysis is a technique for simplifying a data set, which is a linear transformation that transforms data into a new coordinate system, so that the first largest variance of any data projection is on the first coordinate (called the first principal component), the second largest variance is on the second coordinate (the second principal component), and so on. Principal component analysis is often used to reduce the dimensionality of a data set while retaining the characteristics of the data set that contribute most to the variance.

[0070] Sub-step 22, normalizing and polynomial processing are performed on the historical intermediate data characteristics, and the historical standard data characteristics corresponding to the welding of the composite set fluid on the historical copper foil are determined.

[0071] Sub-step 23, screening processing is performed on the historical standard data characteristics, and the historical target data characteristics corresponding to the welding of the composite set fluid on the historical copper foil are determined.

[0072] In this step, screening processing is performed on the historical standard data characteristics by variance test to determine the historical target data characteristics corresponding to the welding of the composite set fluid on the historical copper foil.

[0073] Here, the screening processing method in the embodiments provided by the present application can be customized according to different application scenarios. Assuming that the screening processing method in the embodiments provided by the present application is a variance test method.

[0074] Variance test is suitable for comparing two or more variable data samples, and variance test determines whether the difference between them is simply random or due to statistically significant differences between processes.

[0075] In this way, the historical target data characteristics may filter out some useless data characteristics compared to the historical initial data characteristics. For example, after obtaining the historical initial data characteristics, it is found that the voltage data characteristics in the historical initial data characteristics are useless, and the voltage type of historical initial data characteristics is deleted, and the remaining historical target data characteristics are used.

[0076] Substep 3, inputting the historical target data features into an initial welding quality prediction classifier for model training to determine a trained welding quality detection model.

[0077] In this step, substep 3 includes the following substeps:

[0078] Substep 31, obtaining a historical feature label corresponding to the historical target data features, wherein the historical feature label is used to represent a real historical welding quality score corresponding to the historical target data features.

[0079] Substep 32, inputting the historical target data features into an initial welding quality prediction classifier for model training to determine a predicted historical welding quality score corresponding to the historical target data features.

[0080] In this step, embodiments of the present application provide that the prediction classifier can be customized according to different use requirements. Assuming that the prediction classifier in the embodiments provided by the present application uses a random forest prediction classifier, and the embodiments provided by the present application use grid tuning (i.e., adjusting the loss value).

[0081] Here, the random forest prediction classifier refers to a prediction classifier that uses multiple trees to train and predict samples.

[0082] Substep 33, when the loss value between the predicted historical welding quality score and the real historical welding quality score is less than a preset threshold, the training is stopped, and a trained welding quality detection model is determined.

[0083] S103, determining whether the welding quality of the target copper foil by the composite current collector is qualified based on the target welding quality score.

[0084] In this step, the step S103 includes the following substeps:

[0085] Substep 1031, determining whether the target welding quality score exceeds a preset welding quality score threshold, and determining whether the target peak power corresponding to the welding target copper foil by the composite current collector to be detected exceeds a preset peak power.

[0086] In this step, the target peak power corresponding to the welding target copper foil by the composite current collector to be detected is determined in the following manner:

[0087] Obtaining a target amplitude and a target vibration frequency of an ultrasonic welding head in a seam welding machine of the composite current collector to be detected.

[0088] Here, the greater the target amplitude of the ultrasonic welding horn, the greater the corresponding target peak power when the composite current collector under test is welded to the target copper foil; if the target amplitude of the ultrasonic welding horn is the same, the greater the target frequency of the ultrasonic welding horn, the greater the corresponding target peak power when the composite current collector under test is welded to the target copper foil, that is, the target peak power increases with the increase of the target frequency.

[0089] And the target amplitude and the target vibration frequency of the ultrasonic welding horn fluctuate within a certain range, if the target amplitude and the target vibration frequency of the ultrasonic welding horn change, the target peak power will exceed the preset peak power.

[0090] According to the target amplitude and the target vibration frequency, the corresponding target peak power when the composite current collector under test is welded to the target copper foil is determined.

[0091] Sub-step 1032, if the target welding quality score exceeds the preset welding quality score threshold, and the corresponding target peak power when the composite current collector under test is welded to the target copper foil does not exceed the preset peak power, it is determined that the welding quality of the composite current collector to the target copper foil is qualified.

[0092] In this step, when the target welding quality score exceeds the preset welding quality score threshold, it means that the welding quality of the target copper foil determined by the trained welding quality detection model is qualified, but the detection structure of the welding quality determined by the single trained welding quality detection model is not accurate. Therefore, in the embodiments provided by the present application, the physical factor of the corresponding target peak power when the composite current collector under test is welded to the target copper foil is introduced, and the corresponding target peak power when the composite current collector under test is welded to the target copper foil is compared with the preset peak power to jointly determine the welding quality of the composite current collector to the target copper foil.

[0093] Sub-step 1033, if the target welding quality score does not exceed the preset welding quality score threshold, and / or the corresponding target peak power when the composite current collector under test is welded to the target copper foil exceeds the preset peak power, it is determined that the welding quality of the composite current collector to the target copper foil is unqualified.

[0094] In this step, when the target welding quality score does not exceed the preset welding quality score threshold and the corresponding target peak power when the composite current collector under test is welded to the target copper foil exceeds the preset peak power, it is determined that the welding quality of the composite current collector to the target copper foil is unqualified.

[0095] Here, when the target welding quality score does not exceed the preset welding quality score threshold, it is determined that the welding quality of the composite current collector to the target copper foil is unqualified.

[0096] wherein when the corresponding target peak power of the to-be-detected composite current collector during welding of the target copper foil exceeds the preset peak power, it is determined that the welding quality of the composite current collector on the target copper foil is unqualified.

[0097] Compared with the prior art, the method for determining the welding quality of the composite current collector provided in the embodiments of the present application inputs the collected target data features of the to-be-detected composite current collector during welding of the target copper foil into the trained welding quality detection model, determines the target welding quality score, and determines whether the welding quality of the composite current collector on the target copper foil is qualified according to the target welding quality score and the preset peak power of the seam welder, that is, the embodiments provided in the present application realize real-time judgment and monitoring of the welding quality of the composite current collector by analyzing the target data features and the curves corresponding to the target data features, improve the sensitivity of monitoring the welding quality, and thus realize early warning of the welding quality of the target copper foil.

[0098] Please refer to Figure 2 , Figure 2 FIG. 2 is a flowchart of a method for determining the welding quality of a composite current collector provided in the embodiments of the present application. As shown in FIG. 2, the method for determining the welding quality of the composite current collector provided in the embodiments of the present application comprises the following steps: Figure 2

[0099] S201, determining the target data features of the to-be-detected composite current collector during welding of the target copper foil according to the seam welder roller position data, the seam welder roller impact force data, the seam welder roller vibration data, the seam welder line speed data and the front and rear pressure roller line speed data in the to-be-detected composite current collector.

[0100] S202, inputting the target data features into the trained welding quality detection model to determine the target welding quality score of the target copper foil, wherein the trained welding quality detection model is trained according to the historical data features of the to-be-detected composite current collector during welding of the historical copper foil.

[0101] S203, determining whether the welding quality of the composite current collector on the target copper foil is qualified based on the target welding quality score.

[0102] S204, judging whether overwelding occurs in the process of welding the target copper foil by the to-be-detected composite current collector.

[0103] In this step, when judging whether overwelding occurs in the process of welding the target copper foil by the to-be-detected composite current collector, the embodiments provided in the present application can use, but are not limited to, a visual real-time detection device.

[0104] Please refer to Figure 3 ,​Figure 3 A structure diagram of over-welding in a composite current collector welding quality determination method provided by an embodiment of the present application is shown in the figure. Figure 3 As shown in the figure, the composite current collector welding quality determination method provided by the embodiment of the present application determines whether over-welding occurs to the target copper foil in the welding process through a camera on a visual real-time detection device. If over-welding occurs to the target copper foil in the welding process, the camera on the visual real-time detection device can identify the light source transmitted from the welding mark.

[0105] S205, if yes, determining that the welding quality of the composite current collector to the target copper foil is unqualified.

[0106] In this step, when the visual real-time detection device identifies that over-welding occurs to the target copper foil in the welding process, although it is determined that the welding quality of the composite current collector to the target copper foil is qualified based on the target welding quality score and the preset peak power of the seam welder, the welding quality of the composite current collector to the target copper foil can be directly determined as welding failure according to the identification result.

[0107] Here, over-welding is used to represent that the welding strip and the battery piece are not reliably released, indicating that the tin layer on the welding strip has been melted.

[0108] In this step, after it is determined that over-welding occurs, the reason for over-welding and the corresponding solution can be specifically analyzed.

[0109] The descriptions of S201 to S203 can refer to the descriptions of S101 to S103, and the same technical effects can be achieved, and thus will not be described herein.

[0110] Compared with the prior art, the composite current collector welding quality determination method provided by the embodiment of the present application inputs the collected target data features of the composite current collector when welding the target copper foil into the trained welding quality detection model, determines the target welding quality score, and determines whether the welding quality of the composite current collector to the target copper foil is qualified according to the target welding quality score and the preset peak power of the seam welder. That is, the embodiment provided by the present application realizes real-time judgment and monitoring of the welding quality of the composite current collector by analyzing the target data features and the curves corresponding to the target data features, improves the sensitivity of monitoring the welding quality, and further realizes the welding quality early warning of the target copper foil.

[0111] Please refer to Figure 4 , Figure 4 A structure block diagram of a composite current collector welding quality determination device provided by an embodiment of the present application is shown in the figure. Figure 4 As shown in the figure, the composite current collector welding quality determination device 400 includes:

[0112] The first determination module 410 is configured to determine target data features corresponding to the to-be-detected composite current collector when the to-be-detected composite current collector welds a target copper foil according to the roller position data of the roller welder, the roller impact force data of the roller welder, the roller vibration data of the roller welder, the line speed data of the roller welder, and the line speed data of the front and rear pressure rollers.

[0113] The second determination module 420 is configured to input the target data features into a trained welding quality detection model to determine a target welding quality score of the target copper foil, wherein the trained welding quality detection model is trained according to historical data features of the to-be-detected composite current collector when the to-be-detected composite current collector welds a historical copper foil.

[0114] Optionally, the second determination module 420 specifically determines the trained welding quality detection model in the following manner:

[0115] According to the historical roller position data of the roller welder, the historical roller impact force data of the roller welder, the historical roller vibration data of the roller welder, the historical line speed data of the roller welder, and the historical line speed data of the front and rear pressure rollers, the historical initial data features corresponding to the to-be-detected composite current collector when the to-be-detected composite current collector welds a historical copper foil are determined.

[0116] The historical initial data features are standardized to determine the historical target data features corresponding to the to-be-detected composite current collector when the to-be-detected composite current collector welds a historical copper foil.

[0117] The historical target data features are input into an initial welding quality prediction classifier for model training to determine the trained welding quality detection model.

[0118] Optionally, the inputting of the historical target data features into the initial welding quality prediction classifier for model training to determine the trained welding quality detection model comprises:

[0119] The historical feature labels corresponding to the historical target data features are obtained, wherein the historical feature labels are used to represent real historical welding quality scores corresponding to the historical target data features.

[0120] The historical target data features are input into the initial welding quality prediction classifier for model training to determine predicted historical welding quality scores corresponding to the historical target data features.

[0121] When a loss value between the predicted historical welding quality scores and the real historical welding quality scores is less than a preset threshold value, the training is stopped, and the trained welding quality detection model is determined.

[0122] Optionally, the standardization processing includes noise processing, normalization processing, polynomial processing, and screening processing, the standardization processing on the historical initial data features determines historical target data features corresponding to the to-be-detected composite current fluid when welding the historical copper foil, and includes:

[0123] The noise processing is performed on the historical initial data features to determine historical intermediate data features corresponding to the to-be-detected composite current fluid when welding the historical copper foil.

[0124] The normalization processing and the polynomial processing are performed on the historical intermediate data features to determine historical standard data features corresponding to the to-be-detected composite current fluid when welding the historical copper foil.

[0125] The screening processing is performed on the historical standard data features to determine the historical target data features corresponding to the to-be-detected composite current fluid when welding the historical copper foil.

[0126] The third determination module 430 is configured to determine whether the welding quality of the composite current fluid on the target copper foil is qualified based on the target welding quality score.

[0127] Optionally, the third determination module 430 is specifically configured to:

[0128] determine whether the target welding quality score exceeds a preset welding quality score threshold and whether a target peak power corresponding to the to-be-detected composite current fluid when welding the target copper foil exceeds a preset peak power.

[0129] If the target welding quality score exceeds the preset welding quality score threshold and the target peak power corresponding to the to-be-detected composite current fluid when welding the target copper foil does not exceed the preset peak power, it is determined that the welding quality of the composite current fluid on the target copper foil is qualified.

[0130] If the target welding quality score does not exceed the preset welding quality score threshold and / or the target peak power corresponding to the to-be-detected composite current fluid when welding the target copper foil exceeds the preset peak power, it is determined that the welding quality of the composite current fluid on the target copper foil is unqualified.

[0131] Optionally, the target peak power corresponding to the to-be-detected composite current fluid when welding the target copper foil is determined in the following manner:

[0132] The target amplitude and the target vibration frequency of an ultrasonic welding head in a seam welder of the to-be-detected composite current fluid are acquired.

[0133] The target peak power corresponding to the to-be-detected composite current fluid when welding the target copper foil is determined according to the target amplitude and the target vibration frequency.

[0134] The determining module 440 is configured to determine whether the welding of the target copper foil by the composite current collector has occurred.

[0135] The fourth determining module 450 is configured to determine that the welding quality of the target copper foil by the composite current collector is unqualified if the welding of the target copper foil by the composite current collector has occurred.

[0136] The composite current collector welding quality determination device 400 provided by the embodiments of the present application, compared with the prior art, inputs the collected target data features of the composite current collector when welding the target copper foil into the trained welding quality detection model, determines the target welding quality score, and determines whether the welding quality of the target copper foil by the composite current collector is qualified according to the target welding quality score and the preset peak power of the seam welder. That is, the embodiments provided by the present application realize real-time judgment and monitoring of the welding quality of the composite current collector by analyzing the target data features and the curves corresponding to the target data features, improve the sensitivity of monitoring the welding quality, and further realize the welding quality early warning of the target copper foil.

[0137] Please refer to Figure 5 , Figure 5 The electronic device 500 provided by the embodiments of the present application is shown in FIG. 5. As shown in FIG. 5, the electronic device 500 includes a processor 510, a memory 520 and a bus 530. Figure 5

[0138] The memory 520 stores machine readable instructions executable by the processor 510. When the electronic device 500 is running, the processor 510 and the memory 520 communicate through the bus 530. The machine readable instructions executed by the processor 510 can perform the steps of the composite current collector welding quality determination method in the method embodiments described above. For specific implementation, please refer to the method embodiments, which will not be described here. Figures 1 to 3

[0139] The embodiments of the present application also provide a computer readable storage medium, which stores a computer program. When the computer program is run by a processor, the steps of the composite current collector welding quality determination method in the method embodiments described above can be performed. For specific implementation, please refer to the method embodiments, which will not be described here. Figures 1 to 3

[0140] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be described here.

[0141] ​​​In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. The described device embodiments are merely schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, or the among different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0142] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0143] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit.

[0144] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various other media that can store program codes.

[0145] Finally, it should be noted that the above-described embodiments are merely specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit the same. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any person skilled in the art can make modifications or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features within the technical scope disclosed by the present application. The modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of determining the quality of a composite current collector weld, characterized in that, The composite current collector welding quality determination method comprises: According to the roller position data, the roller impact force data, the roller vibration data, the roller line speed data and the front and rear pressure roller line speed data of the composite current collector to be detected, the target data feature corresponding to the target copper foil welded by the composite current collector to be detected is determined; The target data feature is input into the trained welding quality detection model to determine the target welding quality score of the target copper foil, wherein the trained welding quality detection model is trained according to the historical data features of the historical copper foil welded by the composite current collector to be detected; Based on the target welding quality score, it is determined whether the welding quality of the composite current collector to the target copper foil is qualified; The target data feature corresponding to the target copper foil welded by the composite current collector to be detected is determined according to the following steps: According to the roller position data, the roller impact force data, the roller vibration data, the roller line speed data and the front and rear pressure roller line speed data, the target data feature corresponding to the target copper foil welded by the composite current collector to be detected is determined; The trained welding quality detection model is determined by the following method:

2. The method of claim 1, wherein, According to the historical roller position data, the historical roller impact force data, the historical roller vibration data, the historical line speed data and the historical line speed data of the front and rear pressure rollers of the roller welding machine, the historical initial data feature corresponding to the historical copper foil welded by the composite current collector to be detected is determined; The historical target data feature corresponding to the historical copper foil welded by the composite current collector to be detected is determined by standardizing the historical initial data feature; The historical target data feature is input into the initial welding quality prediction classifier for model training to determine the trained welding quality detection model. The historical target data feature is input into the initial welding quality prediction classifier for model training to determine the trained welding quality detection model, comprising:

3. The method of claim 2, wherein, Obtain the historical feature label corresponding to the historical target data feature, wherein the historical feature label is used to represent the real historical welding quality score corresponding to the historical target data feature; The historical target data feature is input into the initial welding quality prediction classifier for model training to determine the predicted historical welding quality score corresponding to the historical target data feature; When the loss value between the predicted historical welding quality score and the real historical welding quality score is less than a preset threshold, the training is stopped, and the trained welding quality detection model is determined. ​ 4. The method of claim 2, wherein, The standardization processing includes noise processing, normalization processing, polynomial processing and screening processing, the standardization processing is carried out on the historical initial data characteristics, the corresponding historical target data characteristics of the composite current collector fluid when welding the historical copper foil are determined, and the standardization processing includes: Noise processing is carried out on the historical initial data characteristics, and the corresponding historical intermediate data characteristics of the composite current collector fluid when welding the historical copper foil are determined; Normalization processing and polynomial processing are carried out on the historical intermediate data characteristics, and the corresponding historical standard data characteristics of the composite current collector fluid when welding the historical copper foil are determined; The historical standard data characteristics are screened to determine the corresponding historical target data characteristics of the composite current collector fluid when welding the historical copper foil.

5. The method of claim 1, wherein, The target welding quality score is determined based on the target welding quality score, and whether the welding quality of the composite current collector fluid on the target copper foil is qualified, including: Determine whether the target welding quality score exceeds the preset welding quality score threshold, and determine whether the target peak power corresponding to the composite current collector fluid when welding the target copper foil exceeds the preset peak power; If the target welding quality score exceeds the preset welding quality score threshold, and the target peak power corresponding to the composite current collector fluid when welding the target copper foil does not exceed the preset peak power, it is determined that the welding quality of the composite current collector fluid on the target copper foil is qualified; If the target welding quality score does not exceed the preset welding quality score threshold, and / or the target peak power corresponding to the composite current collector fluid when welding the target copper foil exceeds the preset peak power, it is determined that the welding quality of the composite current collector fluid on the target copper foil is unqualified.

6. The method of claim 5, wherein, The target peak power corresponding to the composite current collector fluid when welding the target copper foil is determined in the following way: The target amplitude and target vibration frequency of the ultrasonic welding head in the seam welding machine of the composite current collector fluid are obtained; According to the target amplitude and the target vibration frequency, the target peak power corresponding to the composite current collector fluid when welding the target copper foil is determined.

7. The method of claim 1, wherein The composite current collector fluid welding quality determination method further includes: Determine whether the composite current collector fluid has been welded during the welding process of the target copper foil; If yes, it is determined that the welding quality of the composite current collector fluid on the target copper foil is unqualified.

8. An apparatus for determining the quality of a composite current collector weld, the apparatus comprising: The composite current collector fluid welding quality determination device includes: A first determination module is used to determine the target data characteristics of the composite current collector fluid when welding the target copper foil according to the roll wheel position data, roll wheel impact force data, roll wheel vibration data, roll wheel linear speed data and front and rear pressure roller linear speed data of the composite current collector fluid; A second determination module is used to input the target data characteristics into the trained welding quality detection model to determine the target welding quality score of the target copper foil, wherein the trained welding quality detection model is trained according to the historical data characteristics of the composite current collector fluid when welding the historical copper foil; The third determination module is configured to determine whether the welding quality of the composite current collector to the target copper foil is qualified based on the target welding quality score and preset peak power of the seam welder. The first determination module is further configured to determine the target data feature corresponding to the composite current collector when welding the target copper foil according to the following steps: The upper and lower roller position fluctuation curve of the seam welder is generated according to the seam welder roller position data; the impact force curve is generated according to the seam welder roller impact force data; the vibration fluctuation curve is generated according to the seam welder roller vibration data; the front and rear pressure roller linear velocity difference curve is generated according to the front and rear pressure roller linear velocity data; the seam welding linear velocity difference curve is generated according to the seam welder linear velocity data; and the target data feature corresponding to the composite current collector when welding the target copper foil is determined according to the upper and lower roller position fluctuation curve, the impact force curve, the vibration fluctuation curve, the front and rear pressure roller linear velocity difference curve, and the seam welding linear velocity difference curve.

9. An electronic device, comprising: Comprise: A processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, the machine readable instructions are executed by the processor to perform the steps of the composite current collector welding quality determination method as claimed in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to perform the steps of the composite current collector welding quality determination method as claimed in any one of claims 1 to 7.

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