Method for testing battery foil by using double thickness gauges of aluminum foil rolling mill

Abstract

The invention belongs to the technical field of battery foil rolling detection, and particularly relates to a method for testing a battery foil by using double thickness gauges of an aluminum foil rolling mill, which comprises the following steps of: mounting a sensor assembly on the aluminum foil rolling mill, and acquiring roller rotating speed, rolling force and roller vibration frequency of the aluminum foil rolling mill in real time; and the calculation equipment carries out filtering processing on the original thickness data of the battery foil collected by the thickness gauge based on the roller rotating speed, the rolling pressure and the roller vibration frequency of the aluminum foil rolling mill, instantaneous fluctuation data are filtered, and infrared detectors are arranged on the two sides of a discharging port of the aluminum foil rolling mill. Filtering processing is carried out on thickness data of the battery foil by combining operation parameters of a rolling mill, interference data of vibration of the battery foil on thickness detection in the roller operation process is recognized and removed, and meanwhile detection and cleaning correction are carried out on surface impurities, so that the thickness of a battery foil body and the thickness of the impurities are accurately distinguished; the effect of eliminating false fluctuation and impurity interference is achieved, and the authenticity of thickness detection data is improved.

Description

Technical Field

[0001] This invention belongs to the field of battery foil rolling inspection technology, specifically a method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill. Background Technology

[0002] Aluminum foil rolling mills for battery foil are specialized equipment used to process lithium-ion battery cathode current collectors. Through rolling processes, aluminum is processed into aluminum foil with a thickness of less than 0.2 mm. These mills employ casting or hot rolling processes to roll aluminum ingots into thin sheets, resulting in foils with high tensile strength, conductivity, and ductility, meeting the requirements of lithium-ion battery cathode current collectors. Battery aluminum foil thickness testing involves measuring the thickness of the aluminum foil to ensure it meets design requirements. The thickness of the battery aluminum foil directly affects its conductivity, mechanical strength, and thermal stability.

[0003] During the battery foil rolling process, the rolls vibrate during the operation of the aluminum foil rolling mill. At the same time, oil stains and oxide layers easily remain on the surface of the battery foil. Vibration causes the thickness data collected by the thickness gauge to contain instantaneous fluctuations. In addition, the thickness gauge cannot distinguish between the thickness of the main body and the thickness of impurities, and thus detects the thickness of the battery foil at the location where impurities exist. Both situations will result in the battery foil thickness being detected as being thick in one section and thin in another, making the thickness detection results of the battery foil inaccurate. This leads to a lag in the adjustment of rolling parameters, ultimately affecting the uniformity of the battery foil thickness, increasing product quality risks, and increasing production losses. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill, thereby solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill, characterized by comprising the following steps: S1. Install the sensor assembly on the aluminum foil rolling mill to collect the roll speed, rolling force and roll vibration frequency of the aluminum foil rolling mill in real time. The calculation device performs filtering processing on the original thickness data of the battery foil collected by the thickness gauge based on the roll speed, rolling pressure and roll vibration frequency of the aluminum foil rolling mill, filtering out instantaneous fluctuation data. S2. Infrared detectors are installed on both sides of the discharge port of the aluminum foil rolling mill. The infrared detectors detect the oil stains and oxide layer thickness on the upper and lower surfaces of the battery foil. When the infrared detector value exceeds a preset threshold, the cleaning component is triggered to clean the surface of the battery foil. S3. The two thickness gauges detect the thickness data of the battery foil and compare the two thickness data. When the thickness data detected by the two thickness gauges deviates and exceeds the threshold, the thickness data of the qualified battery foil in the past is called up, and the two thickness gauges are calibrated based on the standard thickness parameters of the battery foil of the same batch and specification in the thickness data. S4. An environmental sensor is installed on the aluminum foil rolling mill to collect the temperature and humidity of the environment around the aluminum foil rolling mill. Based on a preset environmental compensation model, the error parameters of the thickness gauge's detection environment are adjusted to further calibrate the thickness gauge. S5. After the thickness gauge is calibrated, the aluminum foil rolling mill starts rolling the battery foil. The thickness gauge detects the thickness of the battery foil and divides it into three detection areas based on the specifications of the battery foil. The thickness gauge collects data from the three detection areas, compares the data, confirms the thickness tolerance of the three detection areas, outputs the thickness detection result of the battery foil, and transmits the thickness detection result to the control module of the aluminum foil rolling mill for rolling parameter adjustment.

[0006] Preferably, the two thickness gauges are installed on both sides outside the discharge port of the aluminum foil rolling mill. The sensor assembly includes a speed sensor, a magnetic piezometer, and a vibration sensor. The speed sensor is installed at the roll bearing of the aluminum foil rolling mill, the magnetic piezometer is installed below the bearing seat of the roll of the aluminum foil rolling mill, and the vibration sensor is installed at the roll bearing of the aluminum foil rolling mill.

[0007] Preferably, the three detection areas are two edge areas and one middle area of ​​the battery foil, specifically divided according to the width direction of the battery foil.

[0008] Preferably, the infrared detector consists of a transmitter and a receiver, with two transmitters and two receivers. The two transmitters are installed at the outlet of the aluminum foil rolling mill near the upper and lower surfaces of the battery foil, and the two receivers are installed at the outlet of the aluminum foil rolling mill opposite to the transmitters.

[0009] Preferably, the instantaneous fluctuation data includes: incomplete rolling of the battery foil due to excessive rolling speed of the roll, incomplete rolling of the battery foil due to excessive or insufficient rolling force of the roll, and fluctuation in the rolling thickness of the battery foil due to excessive vibration parameters of the roll.

[0010] Preferably, the rolling parameter adjustment includes controlling and adjusting the rolling force, roll speed and roll vibration frequency of the aluminum foil rolling mill.

[0011] Preferably, the cleaning component in step S2 is a high-pressure jet generator, which is installed on the outer wall above and below the outlet of the aluminum foil rolling mill, and the air blowing direction of the high-pressure jet generator is towards the inside of the aluminum foil rolling mill.

[0012] Preferably, the historical qualified thickness data of the battery foil includes 1,000 sets of test data of the battery foil of the same batch and specification under qualified rolling conditions, and the thickness data deviation threshold of the two thickness gauges is 1-1.5μm.

[0013] Preferably, the environmental compensation model corrects errors based on the difference between the actual temperature and the standard temperature around the aluminum foil rolling mill, and also corrects errors based on the difference between the actual relative humidity and the standard humidity around the aluminum foil rolling mill. Furthermore, the correction parameters of the environmental compensation model are calibrated and corrected using the expansion coefficient of battery foil of the same specification under different temperature and humidity conditions.

[0014] Preferably, the filtering process is based on the increase of the vibration frequency of the roll, focusing on filtering out fluctuation data that are not related to the thickness change of the battery foil body caused by the vibration of the roll.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention filters the thickness data of battery foil by combining the operating parameters of aluminum foil rolling mill. By identifying and eliminating the interference data of battery foil vibration during the operation of the rolling mill, and at the same time detecting and cleaning the surface impurities, the thickness of the battery foil body and the impurities are accurately distinguished. This achieves the effect of eliminating false fluctuations and impurity interference, improving the authenticity of the thickness detection data, and providing a reliable basis for accurately judging the actual thickness of battery foil.

[0016] (2) By calling the historical qualified data of battery foil, the deviation of the dual probes is dynamically calibrated, and the test results are compensated and corrected in combination with environmental factors. This eliminates the influence of the difference between the two thickness gauge probes and the temperature and humidity changes on the test accuracy, reduces the systematic error of the thickness gauge, improves the stability of the test data, and ensures the consistency of the thickness test results under different working conditions.

[0017] (3) The thickness of the battery foil on both sides and in the middle is detected by three width areas to confirm whether there is a tolerance in the middle and edge positions of the battery foil during rolling. The results are used to adjust the rolling parameters so that the detection covers the full width of the battery foil and the abnormal feedback is timely. The local thickness characteristics are accurately captured and responded to quickly, so that the rolling parameters of the aluminum foil rolling mill are dynamically optimized during the rolling process, which helps to improve the uniformity of the overall thickness of the battery foil and reduce quality risks. Attached Figure Description

[0018] Figure 1This is a flowchart of the present invention; Figure 2 This is a flowchart illustrating the steps of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 Please see Figure 1 and 2 This invention provides a method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill. To achieve the above objective, this invention is implemented through the following technical solution: A method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill includes the following steps: S1. Install the sensor assembly on the aluminum foil rolling mill to collect the rolling speed, rolling force and rolling vibration frequency of the aluminum foil rolling mill in real time. The calculation device filters the original thickness data of the battery foil collected by the thickness gauge based on the rolling speed, rolling pressure and rolling vibration frequency of the aluminum foil rolling mill, and filters out instantaneous fluctuation data. S2. Infrared detectors are installed on both sides of the discharge port of the aluminum foil rolling mill. The infrared detectors detect the oil stains and oxide layer thickness on the upper and lower surfaces of the battery foil. When the infrared detector value exceeds the preset threshold, the cleaning component is triggered to clean the surface of the battery foil. S3. Two thickness gauges detect the thickness data of the battery foil and compare the two thickness data. When the thickness data detected by the two thickness gauges deviates and exceeds the threshold, the thickness data of historical qualified battery foil is called up, and the two thickness gauges are calibrated based on the standard thickness parameters of battery foil of the same batch and specification in the thickness data. S4. An environmental sensor is installed on the aluminum foil rolling mill to collect the temperature and humidity of the surrounding environment. Based on the preset environmental compensation model, the error parameters of the thickness gauge are adjusted to compensate for the influence of the environmental conditions on the thickness gauge. The thickness gauge is then further calibrated. S5. After the thickness gauge is calibrated, the aluminum foil rolling mill starts rolling the battery foil. The thickness gauge detects the thickness of the battery foil. Based on the specifications of the battery foil, it is divided into three detection areas. The thickness gauge collects data from the three detection areas and compares the data to confirm the thickness tolerance of the three detection areas. It outputs the thickness detection result of the battery foil and transmits the thickness detection result to the control module of the aluminum foil rolling mill for rolling parameter adjustment.

[0021] In this embodiment, specifically, before the battery foil is rolled, the roll speed, rolling force and vibration frequency are collected in real time. Two thickness gauges are symmetrically installed on both sides of the outer side of the aluminum foil rolling mill outlet. The transmitter and receiver of the infrared detector are respectively installed on the upper and lower outer walls of the outlet, corresponding to the upper and lower surfaces of the battery foil. The high-pressure jet is synchronously installed at the upper and lower positions of the outlet, with the blowing direction facing the inside of the aluminum foil rolling mill and at a 45° angle to the foil surface. The environmental sensor is fixed within 1m next to the thickness gauge to ensure the real temperature and humidity of the detection area. After the rolling process starts, the system enters the real-time detection stage. The sensor components collect aluminum foil rolling mill parameters at intervals, and the calculation equipment dynamically adjusts the filtering intensity based on the vibration frequency. The filter filters out instantaneous fluctuation data caused by vibration, and focuses on eliminating non-body thickness change signals generated by roll vibration. At the same time, the infrared detector continuously detects oil stains and oxide layers on the battery foil surface. When the detection value exceeds the preset threshold, the high-pressure jet is automatically started to clean with high-pressure airflow. After cleaning, the system is re-detected after a 5-second delay to confirm the effect. The dual thickness gauges continuously collect thickness data of the battery foil and compare it in real time. When the deviation exceeds the threshold of 1-1.5μm, the system automatically calls the historical qualified database and performs dynamic calibration of the detection head based on standard parameters. At the same time, the environmental sensor updates the temperature and humidity data in real time. The system corrects the detection error by using a preset compensation model and combining the actual temperature and humidity difference with the standard. The thickness gauge adopts a dual optical path redundancy design to ensure the reliability of single-point detection data. The data comparison adopts a sliding window algorithm. The calibration program is only started when the deviation of 5 consecutive detection points exceeds the threshold to avoid miscalibration caused by instantaneous interference. A gradual correction method is adopted during the calibration process, and the correction amount does not exceed 20% of the deviation value each time to prevent data mutations from affecting the rolling stability. Then, the thickness gauge divides the battery foil width into two edge regions and one central region at equal intervals. The three regions are inspected and corresponding regional data are generated. Data for each region is collected independently at a frequency of not less than 5Hz. The thickness tolerance of each region is confirmed by comparison after processing with a moving average. The final test results are transmitted to the aluminum foil rolling mill control equipment in both digital and analog form. The control equipment automatically adjusts the rolling parameters based on the results: adjusting the rolling force according to the thickness deviation ratio, adjusting the roll speed, and suppressing abnormal vibration frequencies through a damping device. This testing method significantly improves the accuracy and stability of battery foil thickness detection through interference suppression and detection calibration. Vibration filtering and environmental compensation technologies effectively eliminate the interference of external factors on the detection. Dynamic calibration of the detection head of the dual thickness gauges ensures the consistency of long-term operation of the dual thickness gauges. Zone detection and closed-loop control realize refined control of thickness quality, reduce product quality risks caused by detection errors, reduce the need for manual intervention, improve production efficiency, and make the quality of produced battery foil stable.

[0022] Example 2 Specifically, two thickness gauges are installed on both sides outside the discharge port of the aluminum foil rolling mill. The sensor assembly includes a speed sensor, a magnetic piezometer, and a vibration sensor. The speed sensor is installed at the roll bearing of the aluminum foil rolling mill, the magnetic piezometer is installed below the main roll bearing seat of the aluminum foil rolling mill, and the vibration sensor is installed at the roll bearing of the aluminum foil rolling mill. Instantaneous fluctuation data include: incomplete rolling of battery foil due to excessive rolling speed of the rolls, incomplete rolling of battery foil due to excessive or insufficient rolling force of the rolls, and fluctuations in the rolling thickness of battery foil due to excessive vibration parameters of the rolls. In step S2, the cleaning component is a high-pressure jet. The high-pressure jet is installed on the outer wall above and below the outlet of the aluminum foil rolling mill, and the air blowing direction of the high-pressure jet is towards the inside of the aluminum foil rolling mill. The infrared detector consists of a transmitter and a receiver, with two transmitters and two receivers. The two transmitters are installed near the upper and lower surfaces of the battery foil at the outlet of the aluminum foil rolling mill, and the two receivers are installed opposite the transmitters at the outlet of the aluminum foil rolling mill. In this embodiment, two thickness gauges are installed on both sides outside the discharge port of the aluminum foil rolling mill. The installation height is aligned with the center of the battery foil running path. The distance between the detection center of the thickness gauge and the discharge port is set to 1.5-2m to ensure that the battery foil is fully stable after leaving the roll before entering the detection area. The thickness gauge is installed by a bracket, and the bottom is fixed to the ground by expansion bolts. An anti-vibration pad is set between the bracket and the aluminum foil rolling mill body to reduce the transmission of vibration from the aluminum foil rolling mill to the thickness gauge. The outer shell of the thickness gauge is equipped with a heat dissipation device, and the working temperature is controlled at 20-30℃ to ensure that the detection accuracy is not affected by temperature changes. The speed sensor is installed at the roll bearing of the aluminum foil rolling mill. It is a non-contact magnetoelectric speed sensor. The detection gear is fixed at the end of the roll shaft, and the gap between the sensor and the gear is maintained at 1±0.2mm. The output signal is a sine wave, which is converted into a square wave by the signal shaping circuit and then connected to the counter to realize speed measurement. The piezomagnetic sensor is installed below the bearing seat of the roll of the aluminum foil rolling mill. It adopts the full-bridge measurement method. The rated load of the piezomagnetic sensor is 1.2 times the maximum rolling force of the aluminum foil rolling mill. The output signal is amplified and filtered before being connected to the A / D converter. The vibration sensor is installed at the roll bearing of the aluminum foil rolling mill. The frequency response is 1-10kHz. It is connected to the data acquisition card through a dedicated shielded cable. The sampling frequency is set to 25.6kHz to ensure complete capture of vibration spectrum characteristics. Instantaneous fluctuation data include incomplete rolling of the battery foil due to excessive rolling speed of the rolls. In this case, the deformation time of the battery foil in the roll entry zone is insufficient, resulting in the thickness of local areas not reaching the target value. The fluctuation characteristics are periodic fluctuations along the rolling direction. Incomplete rolling of the battery foil is caused by excessive or insufficient rolling force of the rolls. Excessive rolling force will increase the elastic deformation of the rolls, resulting in local over-rolling and thinning. Insufficient rolling force will result in insufficient deformation and local over-rolling and thickening. Fluctuations in the rolling thickness of the battery foil are caused by excessive vibration parameters of the rolls. Vibration causes periodic changes in the roll gap. The fluctuation period is consistent with the vibration period of the rolls. The amplitude increases with the increase of vibration intensity. The fluctuation data shows obvious peak characteristics in the frequency domain. The high-pressure jet generator is installed on the outer wall above and below the outlet of the aluminum foil rolling mill. The jet pipeline is made of stainless steel. The working pressure is adjusted by a pressure regulating valve. The jet pressure can be automatically adjusted according to the thickness and type of impurities of the battery foil. The air blowing direction of the high-pressure jet generator is towards the inside of the aluminum foil rolling mill, forming a 45° angle with the surface of the battery foil. The nozzle adopts a flat fan-shaped design, and the spray width matches the width of the battery foil to ensure full coverage and cleaning. The jet generator is equipped with a filter and dryer to prevent impurities and moisture in the air source from contaminating the surface of the battery foil. A pressure sensor is installed at the end of the air pipe to monitor the blowing pressure in real time and trigger an alarm when abnormal. The infrared detector consists of transmitters and receivers, with two transmitters and two receivers. The two transmitters are installed near the upper and lower surfaces of the battery foil at the outlet of the aluminum foil rolling mill, using adjustable focal length lenses with a focal length range of 100-300mm to ensure uniform beam focusing across the width of the battery foil. The transmitters use near-infrared lasers with a wavelength of 1300nm, an output power of 5mW, and a beam divergence angle ≤1mrad. The two receivers are installed at the outlet of the aluminum foil rolling mill opposite to the transmitters, and have built-in high-sensitivity photodiodes with a response wavelength of 900-1700nm. They are equipped with narrow-band filters to effectively suppress stray light. The receiver output signals are processed by a low-noise amplifier and an A / D converter before being connected to the control unit. By transmitting and receiving infrared light, the detector identifies oil stains and oxide layers that may obstruct the infrared light path, thereby confirming whether there are impurities on the surface of the battery foil that could affect thickness detection.

[0023] Example 3 Specifically, the three detection areas are the two edge areas and one middle area of ​​the battery foil, which are divided according to the width direction of the battery foil. The rolling parameter adjustment includes the control and adjustment of the rolling force, roll speed and roll vibration frequency of the aluminum foil rolling mill. The filtering process is based on the increase of the vibration frequency of the roll, and focuses on filtering the fluctuation data of non-battery foil body thickness changes caused by the roll vibration. In this embodiment, the logic of the three detection areas is based on the thickness distribution characteristics during the battery foil rolling process, including two edge areas and one middle area. The edge areas are more prone to thickness deviation due to the tension of the aluminum foil rolling mill. First, the actual width of the battery foil is obtained, and then the boundary is calculated according to the principle that the width of the edge areas is equal and accounts for 30% of the total width. Each area is set up with an independent data storage area to store the latest 100 sets of detection data for real-time statistical analysis. The rolling force is adjusted via an electro-hydraulic servo device. The servo valve has a rated flow rate of 100 L / min, a response time of ≤50 ms, and a control accuracy of ±0.5%FS. The adjustment amount is set in stages according to the absolute value of the thickness deviation. For example, fine adjustment is made when the deviation is <0.3 μm, medium adjustment is made when the deviation is 0.3-0.5 μm, and high adjustment is made when the deviation is >0.5 μm. The roll speed is adjusted by reducing or increasing the speed of the roll drive structure to avoid tension fluctuations caused by sudden changes in speed. The roll vibration frequency is adjusted by an electromagnetic damper installed in the roll bearing housing. The damper operates in the frequency range of 10-500 Hz, and the damping coefficient can be adjusted by the current. The damper parameters are adjusted in a targeted manner according to the main vibration frequency collected by the vibration sensor to suppress the resonant frequency components. The filtering process employs a dual-channel approach. Channel one is a Fast Fourier Transform (FFT) module that performs real-time spectral analysis on the vibration sensor signal to identify the main vibration frequencies. Channel two is an adaptive filter module that dynamically adjusts the filtering parameters based on the main frequencies identified by the FFT module. Filtering is automatically activated when the vibration frequency exceeds 100Hz. During the filtering process, signal distortion is monitored in real-time by comparing the change in the standard deviation of the signal before and after filtering. When the distortion exceeds 5%, the filtering intensity is automatically reduced to ensure that the true thickness change information is preserved.

[0024] Example 4 Specifically, the historical qualified thickness data of battery foil includes the test data of 1,000 sets of battery foil of the same batch and specifications under qualified rolling conditions, and the thickness data deviation threshold of the two thickness gauges is 1-1.5μm; The environmental compensation model corrects errors based on the difference between the actual temperature and the standard temperature around the aluminum foil rolling mill. At the same time, the environmental compensation model corrects errors based on the difference between the actual relative humidity and the standard humidity around the aluminum foil rolling mill. Furthermore, the correction parameters of the environmental compensation model are calibrated and corrected by the expansion coefficient of the same specification battery foil under different temperature and humidity conditions. In this embodiment, the historical qualified thickness data of the battery foil includes 1000 sets of test data of battery foil of the same batch and specification under qualified rolling conditions. Data collection must meet strict operating conditions, specifically, the aluminum foil rolling mill must run continuously and stably for ≥1 hour, the rolling speed and rolling force fluctuations must be ≤±2%, the ambient temperature must be 25±3℃, the humidity must be 50±10%, and the battery foil must pass the thickness inspection. Each set of data includes the processing and testing timestamp, the thickness value of the battery foil measured by the thickness gauge, the thickness values ​​of the three testing areas, rolling parameters, and environmental parameters. The data is updated monthly to supplement the latest qualified batch data, while historical data older than 6 months is removed to ensure data timeliness. The data validity verification adopts statistical methods to calculate the standard deviation of each set of data, remove outliers with a standard deviation >0.3μm, and retain valid data within the 95% confidence interval for calibration. The environmental compensation model considers the thermal expansion of aluminum foil (expansion coefficient 23.1×10). -6 The temperature drift of the thickness gauge sensor (0.02 μm / ℃) and the total temperature correction amount = thermal expansion of aluminum foil + sensor drift amount. Humidity compensation considers the influence of moisture in the air on the detection medium. Every 10% change in humidity leads to a detection deviation of 0.05 μm, as well as the change in the thickness of the water film adsorbed on the aluminum foil surface. The total humidity correction amount = medium influence amount + water film thickness amount. The correction parameters are obtained through temperature and humidity simulation experiments. Thickness calibration is performed every 5℃ and 10% humidity interval within the temperature range of 15-35℃ and humidity range of 30%-70%. The temperature coefficient and humidity coefficient are fitted and stored in the environmental compensation model parameters. The environmental compensation model adopts an online correction method, calculates the correction value based on real-time temperature and humidity, and superimposes it on the original detection data to achieve the correction calibration of thickness detection. By constructing a high-quality historical database, setting dynamic deviation thresholds, and implementing an environmental compensation model, reliable technical support was provided for thickness gauge calibration. The standardized collection and validity verification of historical data ensured the accuracy of the calibration benchmark. Dynamic threshold adjustments adapted to performance changes throughout the lifecycle of the two thickness gauges. The environmental compensation model, built based on material properties and experimental data, effectively offset the impact of temperature and humidity fluctuations on detection. These methods improved the long-term stability of the thickness gauges and the consistency of detection data from the two gauges, reduced detection errors caused by environmental factors, provided a solid guarantee for accurate detection of battery foil thickness, and significantly reduced quality misjudgments caused by dual thickness gauge deviations and environmental interference.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill, characterized in that, Includes the following steps: S1. Install the sensor assembly on the aluminum foil rolling mill to collect the roll speed, rolling force and roll vibration frequency of the aluminum foil rolling mill in real time. The calculation device performs filtering processing on the original thickness data of the battery foil collected by the thickness gauge based on the roll speed, rolling pressure and roll vibration frequency of the aluminum foil rolling mill, filtering out instantaneous fluctuation data. S2. Infrared detectors are installed on both sides of the discharge port of the aluminum foil rolling mill. The infrared detectors detect the oil stains and oxide layer thickness on the upper and lower surfaces of the battery foil. When the infrared detector value exceeds a preset threshold, the cleaning component is triggered to clean the surface of the battery foil. S3. The two thickness gauges detect the thickness data of the battery foil and compare the two thickness data. When the thickness data detected by the two thickness gauges deviates and exceeds the threshold, the thickness data of the qualified battery foil in the past is called up, and the two thickness gauges are calibrated based on the standard thickness parameters of the battery foil of the same batch and specification in the thickness data. S4. An environmental sensor is installed on the aluminum foil rolling mill to collect the temperature and humidity of the environment around the aluminum foil rolling mill. Based on a preset environmental compensation model, the error parameters of the thickness gauge's detection environment are adjusted to further calibrate the thickness gauge. S5. After the thickness gauge is calibrated, the aluminum foil rolling mill starts rolling the battery foil. The thickness gauge detects the thickness of the battery foil and divides it into three detection areas based on the specifications of the battery foil. The thickness gauge collects data from the three detection areas, compares the data, confirms the thickness tolerance of the three detection areas, outputs the thickness detection result of the battery foil, and transmits the thickness detection result to the control module of the aluminum foil rolling mill for rolling parameter adjustment.

2. The method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, Two thickness gauges are installed on both sides outside the discharge port of the aluminum foil rolling mill. The sensor assembly includes a speed sensor, a piezomagnetic sensor, and a vibration sensor. The speed sensor is installed at the roll bearing of the aluminum foil rolling mill, the piezomagnetic sensor is installed below the bearing seat of the roll of the aluminum foil rolling mill, and the vibration sensor is installed at the roll bearing of the aluminum foil rolling mill.

3. The method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The three detection areas are two edge areas and one middle area of ​​the battery foil, specifically divided according to the width direction of the battery foil.

4. The method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The infrared detector consists of a transmitter and a receiver, with two transmitters and two receivers. The two transmitters are installed at the outlet of the aluminum foil rolling mill near the upper and lower surfaces of the battery foil, and the two receivers are installed at the outlet of the aluminum foil rolling mill opposite to the transmitters.

5. The method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The instantaneous fluctuation data includes: the battery foil not being fully rolled due to excessive rolling speed of the roll, the battery foil not being fully rolled due to excessive or insufficient rolling force of the roll, and the battery foil rolling thickness fluctuation caused by excessive vibration parameters of the roll.

6. The method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The adjustment of rolling parameters includes the control and adjustment of the rolling force, roll speed and roll vibration frequency of the aluminum foil rolling mill.

7. The method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The cleaning component mentioned in step S2 is a high-pressure jet generator, which is installed on the outer wall above and below the outlet of the aluminum foil rolling mill, and the air blowing direction of the high-pressure jet generator is towards the inside of the aluminum foil rolling mill.

8. The method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The historical qualified thickness data of the battery foil includes the test data of 1,000 sets of battery foils of the same batch and specifications under qualified rolling conditions, and the thickness data deviation threshold of the two thickness gauges is 1-1.5μm.

9. A method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The environmental compensation model corrects errors based on the difference between the actual temperature and the standard temperature around the aluminum foil rolling mill. It also corrects errors based on the difference between the actual relative humidity and the standard humidity around the aluminum foil rolling mill. Furthermore, the correction parameters of the environmental compensation model are calibrated and corrected using the expansion coefficient of battery foil of the same specification under different temperature and humidity conditions.

10. A method for testing battery foil using a dual thickness gauge on an aluminum foil rolling mill according to claim 1, characterized in that, The filtering process is based on the increase in the vibration frequency of the roll, focusing on filtering out fluctuation data that are not related to the thickness change of the battery foil body caused by the vibration of the roll.

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