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CN-121988608-A - High-speed rolling process for battery aluminum foil

CN121988608ACN 121988608 ACN121988608 ACN 121988608ACN-121988608-A

Abstract

The invention discloses a high-speed rolling process of a battery aluminum foil, which adopts a multi-pass rolling method, adopts gradually-increased deformation, traction tension and rolling speed at the initial stage of rolling, adopts gradually-decreased deformation, traction tension and rolling speed at the final stage of rolling, and simultaneously ensures that the ratio of the thinning rate of a blank to the rolling speed and the traction tension in the multi-pass rolling process meets an exponential function relation. The reduction rate range, inlet/outlet tension and rolling speed of each pass are accurately set, a cogging roll, a middle roll and a finished product roll with specific convexity are configured, gradient control of the temperature of each pass roll and the rolling oil jet flow is matched, and meanwhile, a degreasing roll with adjustable frequency subsonic vibration function is arranged on a rolling line. According to the technical scheme, the high-efficiency production is ensured under the high-speed condition that the average rolling speed is 800m/min, the risk of belt breakage is reduced, and the residual of foil surface rolling oil is reduced.

Inventors

  • ZENG CHAOLIN
  • WANG CHUNSHENG

Assignees

  • 江阴新仁铝箔科技有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (10)

  1. 1. The battery aluminum foil rolling process is characterized by comprising the steps of carrying out multi-pass rolling on a blank, wherein the blank is provided with an increasing deformation amount, a traction tension and a rolling speed in the initial rolling stage; Wherein, during multi-pass rolling, the ratio of the thinning rate of the blank relative to the rolling speed and the traction tension meets the exponential function relation, and the fitting degree is more than or equal to 0.98.
  2. 2. The battery aluminum foil rolling process according to claim 1, comprising the following steps in order: S001, rolling the blank, controlling the thinning rate of the rolled blank to be 47.4% -52.3% compared with the original thickness of the blank, controlling the inlet tension of the blank to be 12% -50N/mm 2 , the outlet tension to be 16% -45N/mm 2 , and controlling the rolling speed to be 450% -800 m/min; s002, rolling the blank for the second time, wherein the thickness of the blank after the second time rolling is controlled to be 53.3% -57.1% compared with the thickness of the blank after the first time rolling, the inlet tension of the blank is 16% -50N/mm 2 , the outlet tension of the blank is 22% -45N/mm 2 , and the rolling speed is controlled to be 650% -1200 m/min; S003, rolling the blank for three times, wherein the thickness of the blank after the three times of rolling is controlled to be 48.3% -55.8% smaller than that of the blank after the second times of rolling, the inlet tension of the blank is 22-50N/mm 2 , the outlet tension of the blank is 28-45N/mm 2 , and the rolling speed is controlled to be 800-1200 m/min; S004, rolling the blank for four times, wherein the thickness of the blank after four times of rolling is controlled to be 34.8% -46.8% thinner than the thickness of the blank after three times of rolling, the inlet tension of the blank is 24-50N/mm 2 , the outlet tension of the blank is 18-55N/mm 2 , and the rolling speed is controlled to be 600-950 m/min.
  3. 3. The battery aluminum foil rolling process according to claim 1, wherein the ratio T/V of the reduction ratio r to the rolling speed and the traction tension satisfies: Wherein r is the thinning rate, the unit is%T is the traction tension, V is the rolling speed, and a, k and c are the undetermined constants respectively.
  4. 4. The battery aluminum foil rolling process according to claim 3, wherein 0.05≤ ≤0.2,50≤ ≤80,45≤ ≤55。
  5. 5. The battery aluminum foil rolling process according to claim 2, wherein the temperature control of the roller spray rolling oil during the rolling process comprises: In S001, the temperature of the roller is controlled to be 55-60 ℃ and the jet flow is 300-400L/min; In S002, the temperature of the roller is controlled at 58-63 ℃ and the jet flow is 380-480L/min; in S003, the temperature of the roller is controlled to be 60-65 ℃ and the jet flow is 450-550L/min; in S004, the temperature of the roller is controlled at 45-50 ℃ and the jet flow is 320-420L/min.
  6. 6. The battery aluminum foil rolling process according to claim 2, wherein the blank is annealed between two adjacent rolling steps, the annealing process comprises heating the blank to 300-350 ℃ at a temperature rising rate of 30-50 ℃ per hour, preserving heat for 6-12 hours, cooling to below 150 ℃ along with a furnace, discharging from the furnace, and air cooling to room temperature.
  7. 7. The rolling process of the battery aluminum foil according to claim 6, wherein in each rolling process, a cogging roll, a middle roll and a finished roll are sequentially arranged along a rolling line, wherein the convexity of the cogging roll is 48-52 mu m, the convexity of the middle roll is 58-62 mu m and the convexity of the finished roll is 78-82 mu m.
  8. 8. The battery aluminum foil rolling process according to claim 7, wherein in each rolling, a degreasing roller which is tangentially attached to one side of the blank is arranged on a rolling line, the degreasing roller is provided with an infrasonic wave generating device arranged on the inner wall of the degreasing roller, and the infrasonic wave generating device is configured to generate vibration with the frequency f of 200-1000 Hz.
  9. 9. The battery aluminum foil rolling process according to claim 8, wherein the vibration frequency of the infrasonic wave generating device is matched with the rolling speed of the pass, and the method is as follows: Wherein f is real-time vibration frequency, V is rolling speed, L is effective roll surface length of the oil removing roll, the unit is m, f 0 is basic frequency, the value is 200Hz, n is frequency matching coefficient and is less than or equal to 3 ≤10。
  10. 10. A battery aluminum foil, characterized by being produced by the production process according to any one of claims 1 to 9.

Description

High-speed rolling process for battery aluminum foil Technical Field The invention relates to the technical field of aluminum foil production and manufacturing, in particular to a high-speed rolling process of a battery aluminum foil. Background With the development of high energy density of lithium ion batteries, the market has increasingly demanded extremely thin battery aluminum foils (thickness 13 μm and below). In order to improve the production efficiency, the average speed of aluminum foil rolling is continuously increased to 800m/min. Under the high-speed rolling condition, the production process faces two technical problems, namely, the risk of breakage is increased sharply, and the oil on the foil surface is difficult to control effectively. In the aspect of the risk of breakage, the total processing rate is extremely high because the aluminum foil is rolled from the initial thickness to the thickness of the finished product, so that the risk of breakage is also increased, the breakage of the strip not only causes direct scrapping of materials, but also causes interruption of the production line for a plurality of hours, and huge economic loss is brought. In the aspect of oil control, high-speed rolling relies on a large amount of rolling oil for cooling and lubrication, but if the rolling oil is not sufficiently volatilized and purged, the rolling oil remains on the surface of the foil. The greasy dirt residue of the finished aluminum foil easily affects the adhesive force of the active material in the subsequent battery pole piece coating process, so that the overall performance and safety of the battery are damaged. At present, the industry usually regards the belt breakage and the belt oil as two independent problems to deal with, so that the belt breakage prevention tends to adopt a higher tension and strong lubrication process, but the rolling oil residue is aggravated, and in order to reduce the belt oil quantity, the oil supply is required to be reduced, the oil temperature is required to be increased to promote volatilization, the lubrication and cooling effects are weakened, and the instability and the belt breakage risk of the rolling process are increased. Therefore, it is necessary to provide a high-speed rolling process for battery aluminum foil with a smaller residual oil content while the breakage rate is lower. Disclosure of Invention The present invention aims to overcome at least one of the problems described in the background. In order to achieve the above purpose, the technical scheme provided by the invention is as follows. The battery aluminum foil rolling process comprises the steps of carrying out multi-pass rolling on a blank, wherein the blank is provided with an increasing deformation amount, a traction tension and a rolling speed in the initial rolling stage; Wherein, during multi-pass rolling, the ratio of the thinning rate of the blank relative to the rolling speed and the traction tension meets the exponential function relation, and the fitting degree is more than or equal to 0.98. As a preferable technical scheme, the battery aluminum foil rolling process sequentially comprises the following steps: S001, rolling the blank, controlling the thinning rate of the rolled blank to be 47.4% -52.3% compared with the original thickness of the blank, controlling the inlet tension of the blank to be 12% -50N/mm 2, the outlet tension to be 16% -45N/mm 2, and controlling the rolling speed to be 450% -800 m/min; s002, rolling the blank for the second time, wherein the thickness of the blank after the second time rolling is controlled to be 53.3% -57.1% compared with the thickness of the blank after the first time rolling, the inlet tension of the blank is 16% -50N/mm 2, the outlet tension of the blank is 22% -45N/mm 2, and the rolling speed is controlled to be 650% -1200 m/min; S003, rolling the blank for three times, wherein the thickness of the blank after the three times of rolling is controlled to be 48.3% -55.8% smaller than that of the blank after the second times of rolling, the inlet tension of the blank is 22-50N/mm 2, the outlet tension of the blank is 28-45N/mm 2, and the rolling speed is controlled to be 800-1200 m/min; S004, rolling the blank for four times, wherein the thickness of the blank after four times of rolling is controlled to be 34.8% -46.8% thinner than the thickness of the blank after three times of rolling, the inlet tension of the blank is 24-50N/mm 2, the outlet tension of the blank is 18-55N/mm 2, and the rolling speed is controlled to be 600-950 m/min. As a preferable technical scheme, the ratio T/V of the reduction ratio r to the rolling speed and the traction tension satisfies: Wherein r is the thinning rate, the unit is%T is the traction tension, V is the rolling speed, and a, k and c are the undetermined constants respectively. As a preferable technical scheme, the content of the active ingredients is less than or equal to 0.05%≤0.2,50≤≤80,45≤≤