Battery foil plate type efficient production and processing method

Abstract

The invention belongs to the technical field of new energy material processing, and particularly relates to a battery foil plate type efficient production processing method, which comprises the following three steps: 1, multi-parameter coupled dynamic rolling regulation and control: collecting data in real time through 12 groups of high-precision sensors, and realizing plate type self-adaptive correction in combination with an improved deep belief network algorithm; the thickness deviation is controlled within + / -1.5 microns; secondly, plasma-assisted molecular self-assembly surface treatment is carried out, an ordered molecular layer is formed through double-stage activation and low-temperature curing, and the peel strength reaches 5-8 N / m; and thirdly, the in-situ reaction composite copper foil is integrally prepared, film modification and copper layer deposition are completed in the same vacuum cavity, the interface bonding strength is 12-15 N / m, and the single-line productivity is improved to 1000-1200 m < 2 > / h. The plate type precision, the surface performance and the production efficiency are remarkably improved, and the method is suitable for production of various lithium battery current collectors.

Description

Technical Field

[0001] This invention belongs to the field of new energy material processing technology, specifically a high-efficiency production and processing method for battery foil. Background Technology

[0002] As a core component of lithium-ion batteries, battery foil serves as the carrier of electrode materials and the pathway for current conduction. The precision of its foil profile (such as flatness and thickness uniformity) significantly impacts battery performance. During charging and discharging, poorly shaped battery foil can lead to uneven electrode material coating, resulting in uneven current distribution. This can cause overcharging and over-discharging in localized areas, severely affecting the battery's energy density, cycle life, and safety.

[0003] Currently, there are three major technological bottlenecks in the production of battery foil: First, the plate shape control during the rolling process relies on experience-based parameters, resulting in a lag in dynamic response. Traditional rolling parameter settings are mostly based on the operator's experience, which cannot respond promptly to subtle fluctuations in the billet material (such as composition deviations and uneven hardness), leading to a thickness deviation rate of battery foil often exceeding 5%. This not only increases the scrap rate in subsequent cutting and processing but may also affect the consistency of the battery due to localized excessive thinness or thickness.

[0004] Secondly, surface treatment often employs physical coating processes, resulting in insufficient adhesion between the coating and the substrate (peel strength < 3 N / m). The coating formed by physical coating processes mainly relies on van der Waals forces to bond with the substrate. During long-term battery cycling, the coating is prone to peeling off, leading to increased internal resistance, accelerated capacity decay, and severely affecting the stability of the battery interface.

[0005] Third, the preparation of composite copper foil requires a multi-step process of sputtering and electroplating, which is cumbersome and has low production efficiency (single-line capacity < 500m). 2 Multi-step processes require multiple conversions in different equipment and environments, which not only prolongs the production cycle (usually up to 4 hours / roll) but also easily introduces impurities during the conversion process, affecting product quality. At the same time, multiple equipment start-ups and shutdowns and environmental adjustments also increase energy consumption and production costs.

[0006] A search revealed that patent CN118616488A discloses an auxiliary device for rolling aluminum alloy battery foil. This device uses a conveying structure with rolling rollers for feeding, a traction structure for clamping, and a cutting head for cutting to achieve foil segment cutting. However, after cutting, the device requires manual re-pulling and repositioning of one end of the rolled foil, making the operation cumbersome, unable to achieve continuous material transport, and exhibiting poor adaptability and efficiency.

[0007] Patent CN118719825A discloses an aluminum alloy battery foil plate shape control device, which controls the speed through the meshing of transmission gears, the interaction of the rotating wheel of the adjustment component and the transmission belt, and the adjustment of the roller gap by a hydraulic cylinder. However, after long-term use, wear and tear on the rollers can cause the speed of the plate shape roller and the pressure roller to deviate, resulting in foil bending or local unevenness and poor plate shape consistency.

[0008] Patent CN114393040B discloses an improved method for the rolling process of 1060 battery foil, which uses a single-parameter roll and a general-purpose oil. This method does not control the roughness of the roll and the acid value of the oil in stages, which easily leads to problems such as blank slippage and scratches on the finished product. In addition, the oil ages quickly, aluminum powder adheres more, and the surface quality and stability are poor. Summary of the Invention

[0009] The purpose of this invention is to propose a high-efficiency production and processing method for battery foil plates to solve the problems mentioned in the background art.

[0010] This invention is achieved through the following technical solution: A high-efficiency manufacturing method for battery foil plates includes the following steps: (1) Dynamic rolling control with multi-parameter coupling: 12 sets of sensors are arranged at the mill inlet, outlet and roll system to collect data on billet thickness, rolling force, roll gap temperature and plate shape curve at a frequency of 1kHz. The data are input into the "material-process-plate shape" dynamic response model constructed based on the improved deep belief network algorithm. When the model determines that the plate shape deviation is >2μm, the bending force of the work roll is adjusted in the range of 0-500kN by a servo motor with a response time of <50ms. At the same time, the axial movement position of the intermediate roll is adjusted in the range of ±100mm. (2) Plasma-assisted molecular self-assembly surface treatment: The rolled battery foil is pretreated for 3-5 seconds by atmospheric plasma with a power of 500-800W and an argon flow rate of 10-15L / min. Then it is immersed in an ethanol solution containing 0.5-2wt% silane coupling agent, with a mass ratio of ethanol to water of 9:1. The reaction is carried out at 40-60℃ and pH 3.5-4.5 for 10-15 minutes to form an ordered molecular layer of 10-20nm. Then it is cured for 30 minutes at 80-100℃ and a vacuum degree <10Pa. (3) In-situ reaction integrated preparation of composite copper foil: A 2-4 μm thick polyimide film is subjected to corona treatment at 300W power for 2 s, and then immersed in 0.1-0.5 mol / L Cu-containing solution. 2 The reaction is carried out in an ethanol solution with +, and then a vacuum of <1×10 is introduced. -4In the composite cavity of Pa, a copper seed layer of 50-100 nm is first deposited by magnetron sputtering at a power of 1-2 kW, and then the total thickness is 1 μm by electron beam evaporation at a rate of 5-10 nm / s, with the evaporation temperature controlled at 150-200℃.

[0011] Preferably, the sensor arrangement in step (1) is as follows: three sets of laser thickness sensors are equidistantly distributed along the width direction at the inlet, four sets of plate-shaped sensors cover the entire width at the outlet, and two and a half sets of temperature sensors and pressure sensors are arranged alternately on both sides of the roller system, with a sensor sampling interval of 1ms.

[0012] Preferably, the hidden layer of the improved deep belief network algorithm in step (1) contains 3 layers of neurons, with the number of neurons in each layer being 128, 64 and 32 respectively. The activation function is the ReLU function, and the initial learning rate during training is 0.01, which decreases by 5% every 1000 iterations.

[0013] Preferably, in step (2), the distance between the nozzle of the atmospheric plasma treatment and the surface of the battery foil is 3-8 mm, the moving speed of the nozzle is 1-3 m / min, and the length of the plasma jet is controlled at 10-20 mm.

[0014] Preferably, the preparation process of the silane coupling agent solution in step (2) is as follows: the silane coupling agent and the ethanol aqueous solution are stirred and mixed at 30-40°C for 15-20 min, the stirring rate is 300-500 r / min, and the mixture is allowed to stand for 5-10 min to remove bubbles before use.

[0015] Preferably, in step (3), the electrode spacing for corona treatment is 0.5-1.5 mm, the film running speed during treatment is 5-15 m / min, and the corona power density is 10-30 W·min / m. 2 .

[0016] Preferably, step (3) contains Cu 2 The reaction time of the ethanol solution is 3-8 min, the reaction temperature is 25-40℃, the solution stirring rate is 100-200 r / min, and the film is rinsed with ethanol 2-3 times after the reaction, with each rinsing time being 10-20 s.

[0017] Preferably, in step (3), the target-substrate distance for magnetron sputtering is 80-120 mm, the sputtering gas is argon with a flow rate of 20-40 sccm, and the sputtering time is 1-3 min; the accelerating voltage for electron beam evaporation is 5-10 kV, the beam current is 50-150 mA, and the film transport speed during evaporation is 2-5 m / min.

[0018] Preferably, in step (1), the rotational speed of the work rolls during the rolling process is 500-1000 r / min, the amount of rolling oil sprayed is 50-100 L / min, and the temperature of the rolling oil is controlled at 30-40℃.

[0019] Preferably, in step (2), the heating rate of the vacuum drying oven is 5-10℃ / min, and after curing, it is cooled to room temperature at the same rate, and then kept in a vacuum state for 30-60min.

[0020] Compared with the prior art, the present invention has the following beneficial effects: Significantly improved plate shape control precision: Through multi-parameter coupled dynamic rolling control, it responds in real time to material fluctuations and process changes, and the thickness deviation of battery foil is controlled within ±1.5μm, which is 40% lower than the traditional method (above ±2.5μm). The flatness reaches 0.5mm / m, ensuring the stability of subsequent processing and the safety performance of the battery.

[0021] Comprehensive optimization of surface properties: Plasma-assisted molecular self-assembly technology forms an ordered molecular layer with covalent bonds, achieving a peel strength of 5-8 N / m; salt spray corrosion resistance exceeds 500 hours, far surpassing traditional physical coating processes (<300 hours); interfacial impedance is reduced by 30%, significantly improving battery charge and discharge efficiency and extending cycle life. Doubled production efficiency: The integrated composite copper foil manufacturing process integrates multiple processes onto the same equipment, achieving a single-line capacity of 1000-1200m³. 2 / h, compared to traditional multi-step methods (<500m) 2 The production efficiency has been increased by more than 100%; the production cycle has been shortened to 1.5 hours / roll; the overall energy consumption has decreased by 25%; and the production cost has been significantly reduced. Attached Figure Description

[0022] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0023] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0024] Dynamic rolling control method with multi-parameter coupling A dynamic response model integrating "material-process-slab shape" was established: To comprehensively and accurately acquire key parameters during the rolling process, 12 sets of high-precision sensors were deployed at the mill inlet, outlet, and roll system, with a sampling frequency of up to 1kHz. Specifically, a laser thickness gauge at the inlet is used to acquire the billet thickness in real time, with an accuracy of ±1μm; pressure sensors at both ends of the work rolls are used to monitor the rolling force, with an accuracy of ±0.5kN; temperature sensors on the roll system are used to measure the roll gap temperature, with an accuracy of ±1℃; and a contact-type slab shape gauge at the outlet is used to acquire slab shape curve data, with a sampling point density of 10 points / cm. These sensors can comprehensively and in real-time reflect the state of the rolling process.

[0025] An improved Deep Belief Network (DBN) algorithm was introduced: This algorithm, based on the traditional DBN algorithm, adds adaptive learning rate adjustment and regularization modules, improving the model's generalization ability and prediction accuracy. Over 5000 sets of historical process data were collected as the training set, covering plate shape data under different billet materials and rolling process parameters. A neural network model was constructed consisting of an input layer (8-dimensional parameters, including billet thickness, hardness, rolling speed, rolling force, roll gap temperature, etc.), a hidden layer (3 layers of feature extraction, each containing 128 neurons), and an output layer (plate shape deviation prediction). Through training on a large amount of data, the model achieved a prediction accuracy of 92%, accurately predicting plate shape deviations under different combinations of process parameters.

[0026] Real-time closed-loop control: When the model detects a plate shape deviation > 2μm, the system immediately initiates real-time closed-loop control. The bending force of the work rolls (adjustment range 0-500kN) and the axial movement position of the intermediate rolls (adjustment range ±100mm) are dynamically adjusted via servo motors (response time < 50ms). Adjusting the bending force of the work rolls changes the roll crown, thereby adjusting the middle portion of the plate shape; adjusting the axial movement position of the intermediate rolls changes the contact length between the rolls and the billet, thereby adjusting the edges of the plate shape. Through the synergistic effect of these two adjustment methods, adaptive correction of the rolling process is achieved, ensuring plate shape accuracy.

[0027] Plasma-assisted molecular self-assembly surface treatment method Two-stage surface activation: First, the rolled battery foil is pretreated using atmospheric plasma. The plasma equipment power is 500-800W, the argon flow rate is 10-15L / min, and the treatment time is 3-5s. The high-energy particles in the plasma bombard the foil surface, removing surface oil and oxide layers, while simultaneously introducing a large number of active groups (such as hydroxyl groups) to the surface, increasing the surface hydroxyl density to 1.2×10⁻⁶. 15 pcs / cm 2Then, the plasma-treated battery foil is immersed in an ethanol solution containing a silane coupling agent (concentration 0.5-2wt%), with an ethanol to water mass ratio of 9:1, and reacted at 40-60℃ for 10-15 min. The alkoxy groups in the silane coupling agent molecules can undergo hydrolysis-condensation reactions with the hydroxyl groups on the foil surface to form chemical bonds.

[0028] Directed molecular layer growth: By controlling the solution pH (3.5-4.5), a suitable chemical environment is provided for the directional alignment of silane coupling agent molecules. Within this pH range, the interaction forces between silane coupling agent molecules are moderate, allowing them to arrange themselves orderly on the foil surface and covalently bonded to the foil surface via Si-O bonds, forming an ordered molecular layer with a thickness of 10-20 nm. XPS (X-ray photoelectron spectroscopy) analysis shows that the uniformity of Si element distribution is >95%, indicating good uniformity of the molecular layer.

[0029] Low-temperature curing: The battery foil treated with molecular self-assembly is placed in a vacuum drying oven at 80-100℃ (vacuum degree <10Pa) for curing for 30 minutes. The vacuum environment prevents contamination of the molecular layer by airborne impurities, while low-temperature curing prevents the molecular layer from decomposing or deforming due to high temperatures. During curing, further cross-linking reactions occur between silane coupling agent molecules, increasing the degree of cross-linking of the molecular layer to over 85%, thereby improving the mechanical properties and stability of the molecular layer, with a peel strength of 5-8 N / m.

[0030] In-situ reaction integrated preparation method of composite copper foil Functional film modification: Polyimide (PI) films (2-4 μm thick) were selected as the substrate. First, carboxyl functional groups were introduced onto the film surface through corona treatment (300 W power, 2 s treatment time). During the corona treatment, high-energy electrons bombarded the PI film surface, causing surface molecules to break down and oxidize, forming active groups such as carboxyl groups. Then, the treated PI film was immersed in a Cu-containing solution. 2 In an ethanol solution (concentration 0.1-0.5 mol / L) containing Cu, 2 + undergoes a coordination reaction with the carboxyl group to form a coordinate bond, making Cu 2 + Uniformly adsorbed on the surface of the PI film.

[0031] One-step deposition and lamination: A magnetron sputtering-evaporation composite equipment is used, which integrates magnetron sputtering and electron beam evaporation functions within the same vacuum chamber. First, the modified PI film is introduced into the vacuum chamber, and the vacuum level is evacuated to 1×10⁻⁶. -4The process involves depositing a 50-100 nm copper seed layer on the PI film surface using magnetron sputtering (power 1-2 kW). This seed layer provides uniform nucleation sites for subsequent copper layer growth. The copper layer is then thickened to 1 μm using electron beam evaporation (rate 5-10 nm / s). The entire process is completed in the same vacuum environment, avoiding atmospheric pollution and quality issues caused by multiple process transitions.

[0032] Interface strengthening: During the vapor deposition process, the deposition temperature is controlled at 150-200℃. At this temperature, Cu atoms have high activity and can react in situ with the carboxyl groups on the PI film surface to form Cu-O covalent bonds. The bonding strength of this covalent bond is much higher than that of the physical bond. Tensile tests show that the interfacial bonding strength reaches 12-15 N / m, which significantly improves the stability of the composite copper foil interface.

[0033] Example 1 Dynamic rolling process of 10μm lithium battery aluminum foil (e.g.) Figure 1 (As shown) Raw material preparation: 0.3mm thick 1060 aluminum foil raw material was selected. The chemical composition of this raw material met the requirements of GB / T3190-2008 standard, with an aluminum content ≥99.6%. To improve the plasticity and rolling properties of the raw material, it was annealed at 350℃ for 2 hours to control the grain size of the raw material to 50-80μm. After annealing, the raw material was surface cleaned to remove oxide scale and oil, ensuring lubrication during the rolling process.

[0034] Sensor Arrangement: A laser thickness gauge with a measurement range of 0-500μm and an accuracy of ±0.5μm is installed at the mill inlet, enabling real-time and accurate measurement of billet thickness. Pressure sensors with a range of 0-2000kN and an accuracy of ±0.5kN are installed at both ends of the work rolls to monitor rolling force during the rolling process. A contact-type profile gauge with a sampling point density of 10 points / cm is installed at the outlet, enabling rapid acquisition of aluminum foil profile curve data. Fiber optic transmission is used between the sensors and the central control system to ensure real-time and stable data transmission with a transmission delay of <10ms.

[0035] Model Training: Process data of 10μm aluminum foil produced over the past three months was imported. This data included eight parameters: billet hardness (measured using a Vickers hardness tester), rolling speed, rolling force, roll gap temperature, bending force of the work rolls, and axial movement position of the intermediate rolls, along with corresponding sheet shape deviation data, totaling over 5000 sets. This data was divided into a training set (80%) and a validation set (20%), and then imported into an improved Deep Belief Network (DBN) algorithm model for training. During training, an adaptive learning rate adjustment strategy was adopted, with an initial learning rate of 0.01, which was gradually decreased as the number of training iterations increased. Simultaneously, L2 regularization was added to prevent overfitting. After 72 hours of training, a sheet shape prediction model was obtained, with a mean squared error of <0.8μm on the validation set and a prediction accuracy of 92%.

[0036] Rolling parameters: Based on the plate shape prediction model and production experience, the rolling parameters are set as follows: rolling speed 600-800 m / min, initial rolling force 800-1000 kN, and work roll temperature controlled at 50±2℃. During the rolling process, a special rolling oil (viscosity 10-15 cSt at 40℃) is used, which is evenly sprayed onto the surface of the work rolls and the billet through an oil spraying device to provide lubrication and cooling.

[0037] Dynamic control: During the actual rolling process, sensors collect various parameters in real time and transmit them to the central control system. When the shape gauge detects an edge waviness > 3μm, the system automatically increases the bending roll force by 50-80kN, eliminating the edge waviness by changing the crown of the work roll. When crowning occurs in the middle, the intermediate roll moves 20-30mm to both sides, changing the contact length between the work roll and the billet, thereby adjusting the middle shape. The response time of the entire adjustment process is <100ms, ensuring that shape deviations can be corrected in a timely manner.

[0038] Finished Product Inspection: After rolling, the 10μm lithium battery aluminum foil underwent finished product inspection. A laser thickness gauge was used to measure the thickness of the aluminum foil at multiple points, and the results showed a thickness deviation of ±1.2μm, meeting design requirements. A flatness measuring instrument (accuracy ±0.05mm / m) was used to measure the flatness of the aluminum foil, and the result was 0.4mm / m. In addition, the surface roughness (Ra < 0.1μm) and mechanical properties (tensile strength > 120MPa, elongation > 3%) of the aluminum foil were tested, and all met the Class A standard for power battery electrode foil.

[0039] Example 2 Copper foil surface molecular self-assembly treatment Pretreatment: The rolled 8μm electrolytic copper foil (purity ≥99.95%) was ultrasonically cleaned with deionized water (resistivity >18.2MΩ・cm) at a power of 300W for 5 minutes to remove surface oil and impurities. After cleaning, the copper foil was placed in a forced-air drying oven and dried at 60℃ for 10 minutes to ensure no moisture residue remained on the surface.

[0040] Plasma activation: The surface of the copper foil was activated using an atmospheric pressure plasma jet (APPJ) device. The argon flow rate was set to 12 L / min, the device power to 600 W, the treatment distance (distance between the nozzle and the copper foil surface) to 5 mm, and the treatment time to 4 s. After treatment, the contact angle of the copper foil surface was measured using a contact angle meter (model JC2000D). The results showed that the contact angle decreased from 75° before treatment to 25°, indicating a significant improvement in the hydrophilicity of the copper foil surface and enhanced surface activity.

[0041] Molecular Assembly: An ethanol solution containing γ-aminopropyltriethoxysilane (KH550) was prepared, with a KH550 concentration of 1 wt%. The pH of the solution was adjusted to 4.0 with acetic acid (analytical grade), and after thorough stirring, the solution was added to a surface treatment tank. Plasma-activated copper foil was immersed in the solution and reacted in a 50°C constant temperature water bath for 12 min. During the reaction, a stirring device was used to maintain uniform flow of the solution, ensuring full contact between the copper foil surface and the solution.

[0042] Curing Treatment: The reacted copper foil was removed from the solution, rinsed with deionized water to remove any residual solution, and then placed in a vacuum drying oven (model DZF-6050) for curing. The drying temperature was set to 90℃, the vacuum degree to 5Pa, and the curing time to 30min. After curing, the thickness of the molecular layer was measured using an elliptic polarization spectrometer (model M-2000U), which showed the formation of a silane molecular layer with a thickness of 15nm. X-ray photoelectron spectroscopy (model ESCALAB 250Xi) was used to analyze the composition of the molecular layer, showing that the uniformity of Si element distribution on the copper foil surface reached 96%, indicating uniform molecular layer growth.

[0043] Performance Testing: Peel tests were conducted using a tensile testing machine (model WDW-5). A 25mm wide copper foil sample was fixed on the machine, and peeling was performed at a speed of 50mm / min. The results showed that the adhesion between the molecular layer and the copper foil reached 6.8 N / m, significantly higher than the adhesion of traditional physical coating processes (<3 N / m). The treated copper foil was then placed in 1mol / L H2SO4... 4的Corrosion tests were conducted in solution, and the corrosion current was monitored using an electrochemical workstation (model CHI660E). The results showed that the corrosion rate was reduced by 60% compared to the untreated copper foil, indicating a significant improvement in corrosion resistance. Simultaneously, interfacial impedance tests were performed between the treated copper foil and the cathode material (LiFePO4). The results showed a 32% reduction in interfacial impedance, which is beneficial for improving the battery's charge and discharge efficiency.

[0044] Example 3 Integrated fabrication of PI / copper composite foil PI film pretreatment: A 3μm thick polyimide (PI) film (model Kapton HN) with a tensile strength >150MPa and elongation at break >40% was selected. The PI film was surface-treated using a corona treatment machine (model JYD-300) at a power of 300W, a processing speed of 10m / min, and a processing time of 2s. After treatment, X-ray photoelectron spectroscopy was used to analyze the functional groups on the film surface, showing that the surface carboxyl content increased to 0.8 mmol / m. 2 This lays the foundation for subsequent coordination reactions.

[0045] Coordination modification: A 0.3 mol / L Cu(NO3)2 ethanol solution was prepared, with an ethanol purity of 99.9%. The corona-treated PI film was immersed in this solution and reacted in a 30°C constant temperature water bath for 5 min. During the reaction, stirring was used to ensure uniform contact of the solution with the film surface, ensuring that the Cu... 2 + It can react fully with carboxyl groups. After the reaction is complete, the film is removed and the unreacted Cu on the surface is rinsed with ethanol. 2 +, then dry at 60℃ for 5 min. The Cu on the film surface was analyzed using an atomic absorption spectrometer (model AA-7000). 2 The content of Cu was detected, and the results showed that... 2 The adsorption capacity of + is 0.5 mg / cm³. 2 The uniformity of distribution is >95%.

[0046] Vacuum deposition: The modified PI film was introduced into the magnetron sputtering-evaporation composite chamber (model Kurt J. Lesker PVD75). First, the vacuum chamber was evacuated to a vacuum level of 5×10⁻⁻. 5 Pa. The magnetron sputtering target (Cu target, 99.99% purity) was turned on, the power was set to 1.5 kW, and the deposition time was 30 s, depositing an 80 nm copper seed layer on the PI film surface. Immediately after the seed layer deposition, the electron beam evaporation source (Cu wire, 99.99% purity) was turned on, the evaporation rate was set to 8 nm / s, and the deposition time was 112 s, thickening the copper layer to 1 μm. Throughout the deposition process, the temperature was monitored in real time by a temperature sensor within the chamber to ensure a stable deposition environment.

[0047] In-situ reaction: During the vapor deposition process, the chamber temperature is controlled at 180℃ using a heating device. At this temperature, Cu atoms exhibit high reactivity and can react in-situ with the carboxyl groups on the PI film surface to form Cu-O covalent bonds. The reaction process is monitored in real time using an infrared spectrometer (Nicolet iS50). The temperature is measured at 1720 cm⁻¹. -1 When the intensity of the carboxyl characteristic peak decreases by 50%, it indicates that the reaction has achieved the expected effect.

[0048] Performance testing: The sheet resistance of the composite foil was measured using a four-probe tester (model RTS-8). The results showed that the sheet resistance was <0.5Ω / m. 2 The composite foil meets the conductivity requirements of battery current collectors. A tensile testing machine was used to test the interfacial peel strength. The composite foil sample was cut into 25mm wide strips and peeled at a speed of 50mm / min. The results showed an interfacial peel strength of 14.2 N / m, significantly higher than the bonding strength of traditional composite processes (<8 N / m). A bending test was conducted, where the composite foil was bent 180° 100 times. The interface state was observed using an optical microscope (Olympus BX53), and no delamination was found, indicating good flexibility and interfacial stability. Furthermore, the thickness uniformity of the composite foil was tested, and the results showed a thickness deviation of ±0.1μm, meeting the requirements for high-precision battery foil.

[0049] Finally, it should be noted that the basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification, and therefore remain within the spirit and scope of the exemplary embodiments of this specification. Furthermore, this specification uses specific terms to describe embodiments of this specification. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined. Moreover, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this specification are not intended to limit the order of the processes and methods of this specification.

[0050] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency manufacturing method for battery foil plates, characterized in that, Includes the following steps: (1) Dynamic rolling control with multi-parameter coupling: 12 sets of sensors are arranged at the mill inlet, outlet and roll system to collect data on billet thickness, rolling force, roll gap temperature and plate shape curve at a frequency of 1kHz. The data are input into the "material-process-plate shape" dynamic response model constructed based on the improved deep belief network algorithm. When the model determines that the plate shape deviation is >2μm, the bending force of the work roll is adjusted in the range of 0-500kN by a servo motor with a response time of <50ms. At the same time, the axial movement position of the intermediate roll is adjusted in the range of ±100mm. (2) Plasma-assisted molecular self-assembly surface treatment: The rolled battery foil is pretreated for 3-5 seconds by atmospheric plasma with a power of 500-800W and an argon flow rate of 10-15L / min. Then it is immersed in an ethanol solution containing 0.5-2wt% silane coupling agent, wherein the mass ratio of ethanol to water is 9:

1. The reaction is carried out at 40-60℃ and pH 3.5-4.5 for 10-15 minutes to form an ordered molecular layer of 10-20nm. Then it is cured for 30 minutes at 80-100℃ and a vacuum degree <10Pa. (3) In-situ reaction integrated preparation of composite copper foil: A 2-4 μm thick polyimide film is subjected to corona treatment at 300W power for 2 s, and then immersed in 0.1-0.5 mol / L Cu-containing solution. 2 The reaction is carried out in an ethanol solution with +, and then a vacuum of <1×10 is introduced. -4 In the composite cavity of Pa, a copper seed layer of 50-100 nm is first deposited by magnetron sputtering at a power of 1-2 kW, and then the total thickness is 1 μm by electron beam evaporation at a rate of 5-10 nm / s, with the evaporation temperature controlled at 150-200℃.

2. The high-efficiency production and processing method for battery foil plates according to claim 1, characterized in that, In step (1), the sensor arrangement is as follows: three sets of laser thickness sensors are distributed at equal intervals along the width direction at the inlet, four sets of plate-shaped sensors cover the entire width at the outlet, and two and a half sets of temperature and pressure sensors are arranged alternately on both sides of the roller system. The sensor sampling interval is 1ms.

3. The high-efficiency production and processing method for battery foil plates according to claim 1, characterized in that, In step (1), the hidden layer of the improved deep belief network algorithm contains 3 layers of neurons, with the number of neurons in each layer being 128, 64, and 32 respectively. The activation function is the ReLU function, and the initial learning rate during training is 0.01, which decreases by 5% every 1000 iterations.

4. The efficient production and processing method for battery foil plates according to claim 1, characterized in that, In step (2), the distance between the nozzle of the atmospheric plasma treatment and the surface of the battery foil is 3-8 mm, the moving speed of the nozzle is 1-3 m / min, and the plasma jet length is controlled at 10-20 mm.

5. The high-efficiency production and processing method for battery foil plates according to claim 1, characterized in that, The preparation process of the silane coupling agent solution in step (2) is as follows: stir the silane coupling agent and the ethanol aqueous solution at 30-40℃ for 15-20 min, the stirring rate is 300-500 r / min, and let it stand for 5-10 min to remove bubbles before use.

6. The high-efficiency production and processing method for battery foil plates according to claim 1, characterized in that, In step (3), the electrode spacing for corona treatment is 0.5-1.5 mm, the film running speed during treatment is 5-15 m / min, and the corona power density is 10-30 W·min / m. 2 .

7. The efficient production and processing method for battery foil plates according to claim 1, characterized in that, Step (3) contains Cu 2 The reaction time of the ethanol solution is 3-8 min, the reaction temperature is 25-40℃, the solution stirring rate is 100-200 r / min, and the film is rinsed with ethanol 2-3 times after the reaction, with each rinsing time being 10-20 s.

8. The high-efficiency production and processing method for battery foil plates according to claim 1, characterized in that, In step (3), the target-substrate distance for magnetron sputtering is 80-120 mm, the sputtering gas is argon, the flow rate is 20-40 sccm, and the sputtering time is 1-3 min; the accelerating voltage for electron beam evaporation is 5-10 kV, the beam current is 50-150 mA, and the film transport speed during evaporation is 2-5 m / min.

9. The high-efficiency production and processing method for battery foil plates according to claim 1, characterized in that, In step (1), the working roll speed is 500-1000 r / min, the rolling oil injection volume is 50-100 L / min, and the rolling oil temperature is controlled at 30-40℃.

10. A high-efficiency production and processing method for battery foil plates according to claim 1, characterized in that, In step (2), the heating rate of the vacuum drying oven is 5-10℃ / min. After curing, the temperature is reduced to room temperature at the same rate, and then the vacuum state is maintained for 30-60min.

Images