CN116237363A - Process for producing aluminum foil for high-strength double-light lithium battery in four passes - Google Patents
Process for producing aluminum foil for high-strength double-light lithium battery in four passes Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
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Abstract
The invention belongs to the technical field of light alloy, and relates to a process for producing aluminum foil for a high-strength double-light lithium battery by four passes, which comprises the following steps: the thickness of the blank is 0.26-0.3 mm, the hardness state H18 is that the content of the trace alloy element copper is adjusted from 0.05-0.1% to 0.1-0.15%; the blank is subjected to distributed rolling according to a 4-pass process, wherein the rough rolling and the middle rolling are performed for 3 passes, and the finish rolling is performed for 1 pass; taking a blank with the thickness of 0.26mm as an example, rough rolling and middle rolling are arranged on the same rolling mill, 3-pass rolling is carried out to obtain an aluminum foil with the thickness of 0.025mm, 1-pass finish rolling is carried out to obtain a double-photocell foil with the thickness of 0.012mm, and the rolling passes are distributed as follows: 0.26mm, 0.115mm, 0.055mm, 0.025mm, 0.012mm, cutting, corona, inspecting and packaging. According to the invention, the copper content in the blank is improved, the 95# base oil is matched with the additive W3H, and the superposition ratio of the actual plate shape and the target plate shape is more than 95%. And the roller process and the high oil temperature are regulated, the volatilization and corona of the foil oil film are increased, the surface dyne value of the finished product is more than 32, the yield is improved by 10-15%, and the comprehensive yield is more than 80%.
Description
Technical Field
The invention belongs to the technical field of light alloy, relates to aluminum foil production, and particularly relates to a four-pass process for producing aluminum foil for a high-strength double-light lithium battery.
Background
With the rapid development of new energy electric vehicles, the lithium battery as a core component has a strong demand, and the aluminum foil as a positive electrode material of the lithium battery is required to have higher performance and quality requirements. The requirements of various technical indexes of the battery foil are strict, and the requirements of customers on the thickness, strength, shape, cleanliness and the like of the battery foil reach the limit, so that the production difficulty is high. Domestic aluminum foil for high-strength double-light lithium batteries generally requires: the thickness is 15, 13 and 12 mu m, and the finished product has the performance tensile strength of more than or equal to 250N/mm 2 The elongation is more than or equal to 3.0%, the collapse amount of the plate form is less than or equal to 8mm, and the surface wetting tension is more than or equal to 32dyn.
The current battery foil manufacturing technology is mostly optimized on the basis of the common aluminum foil rolling technology, and is approximately as follows: 1. the rolling pass is increased, the pass reduction rate is reduced, and the high tensile strength of the finished product is achieved through a multi-pass work hardening method; 2. in order to improve the surface wetting tension of the battery foil, the rolling mill adopts 80# and 82# base oil to simultaneously match with the special additive for the battery foil, and a high-power lamp box is adopted for baking and corona treatment in the slitting process.
The problems are mainly:
(1) High strength lithium battery foil rolling is difficult: when 80# or 82# base oil is used in the traditional process, the problem that high-strength battery foil rolling is not carried out or pass processing cannot be achieved exists, so that most manufacturers adopt processes of increasing rolling passes and reducing blank thickness, 5 or 6 rolling passes are commonly adopted in industry, and the blank thickness is less than or equal to 0.24 mm. Thus, the production efficiency is greatly reduced, and the production cost is also greatly increased.
(2) The flatness of the product plate is unstable, and the phenomenon of local tightness change is obvious: the high-end battery foil client has extremely high requirements on the form of the battery foil, and the off-line form detector needs to load 8N/mm at a measuring interval of 2m 2 After the force, laserThe maximum collapse of the scanning foil surface is less than or equal to 8mm. The unevenness of the plate shape can influence the uniformity and consistency of the carbon coating process of the battery, and is a key technical index of the energy density of the battery. Along with the development of industry, the requirements on the shape accuracy of the lithium battery foil are continuously improved, and when 80# or 82# base oil is used, the abrasion resistance and lubrication of rolling oil can not completely adapt to the rolling requirements due to the fact that the kinematic viscosity is only about 1.75, so that the roller is uneven in hot bulge, and finally the shape of the foil surface is poor. In fact, battery foil users are very much complaining and returning of quality for plate types. The plate type quality of the product is continuously improved through process optimization and technical innovation, and the plate type quality is an important subject faced by battery foil manufacturers.
(3) Surface wetting tension: insufficient surface wetting tension can seriously affect the carbon coating quality of the battery foil. Defects such as missing coating, delamination and the like can occur in the carbon coating process when the wetting tension does not reach the standard, and the defects can directly lead to product scrapping, so that the wetting tension is more than or equal to 32dyn for foil surface detection.
These problems lead to low comprehensive yield in the production of the battery foil, high production cost and many difficulties for manufacturers of lithium battery aluminum foils. Along with the rapid rise of new energy automobiles, the aluminum foil requirement of the lithium battery is greatly improved, and the development and production of the aluminum foil of the lithium battery with high quality and adaptability to market requirements are imperative.
Disclosure of Invention
Aiming at the problems of high rolling difficulty, low production efficiency and high production cost of the existing aluminum foil for producing lithium batteries, the invention aims to disclose a process for producing the aluminum foil for the high-strength double-light lithium batteries in four passes.
A process for producing aluminum foil for a high-strength double-light lithium battery by four passes comprises the following steps:
the thickness of the blank is 0.26-0.3 mm, the hardness state H18 is that the content of the trace alloy element copper is adjusted from 0.05-0.1% to 0.1-0.15%;
the blank is subjected to distributed rolling according to a 4-pass process, wherein the rough rolling and the middle rolling are performed for 3 passes, and the finish rolling is performed for 1 pass; taking a blank with the thickness of 0.26mm as an example, rough rolling and middle rolling are arranged on the same rolling mill, 3-pass rolling is carried out to obtain an aluminum foil with the thickness of 0.025mm, 1-pass finish rolling is carried out to obtain a double-photocell foil with the thickness of 0.012mm, and the rolling passes are distributed as follows:
0.26mm→0.115mm→0.055mm→0.025mm→0.012mm，
cutting, corona, inspecting and packaging the finished product to obtain the finished product of the lithium battery foil.
In the preferred embodiment of the invention, the tensile strength of the blank in the step A is more than or equal to 195/mm 2 The performance elongation is more than or equal to 3.0 percent, and meets the requirement that the finished product of the blank reaches high strength under 4-pass rolling.
Further, the alloy brand of the blank is 1100 alloy.
In the preferred embodiment of the present invention, in the step B, parameters of the rolls used in each pass are as follows:
roughing work roll roughness was selected at Ra: between 0.26 and 0.28 mu m, convexity is selected from Cr:0.035mm;
the roughness of the middle rolling working roll is selected at Ra: between 0.16 and 0.17 mu m, convexity is selected from Cr:0.05mm;
coarseness Ra of backup roll used for rough and medium rolling: between 0.60 and 0.65 mu m, convexity is selected from Cr:0.04mm;
the target plate profile curve value of rough rolling pass is less than or equal to 13N/mm 2 The target plate profile curve value of the intermediate rolling pass is less than or equal to 11N/mm 2 。
In the preferred embodiment of the invention, the rolling oil used in the first 3 passes in the step B is formed by mixing 95# base oil with alcohol and ester additive, wherein the alcohol content in the additive is 3-5% by mass and takes C12 lauryl alcohol as the main component; the content of the ester is 3-5 percent, and the butyl stearate is the main component.
Further, the temperature of the rolling oil is controlled to be 50-55 ℃ in the first 3-pass rolling.
In the preferred disclosed example of the invention, in the step B, a single aluminum foil with the thickness of 0.025mm obtained by medium rolling is taken as an example, and the roughness of a finish rolling working roll is Ra of 0.12-0.13 mu m, and convexity Cr:0.06mm;
finishing mill backing roll roughness Ra: 0.60-0.65 mu m, convexity Cr0.04mm;
the target plate profile curve value of the finish rolling pass is less than or equal to 7N/mm 2 。
In the preferred embodiment of the invention, the rolling oil used in the 4 th pass finish rolling in the step B is 95# base oil and 5-7% of ester additive W3H, wherein the ester content in the additive W3H is 70%, and the rolling oil is purchased from Xintai specialty oil Co. The temperature of the rolling oil is controlled to be 60-65 ℃ during rolling.
In the preferred embodiment of the invention, the corona in the step C belongs to a battery foil surface treatment device, and has the functions of cleaning a small amount of residual oil on the surface of an aluminum foil, reducing the thickness of an oil film on the surface of the aluminum foil, improving the surface wetting tension, preventing the carbon coating process from generating coating omission and the like. And carrying out surface corona by adopting corona equipment with the power of 7-10 kW and the output voltage of 25 kV.
Advantageous effects
The invention is different from the conventional battery foil production process in that after the copper content in the battery blank is increased, 95# base oil with the viscosity of 2.05 is matched with a novel additive W3H, and the wear resistance and the lubricating property of the rolling oil are stronger. The high-performance battery foil produced by 4 passes is realized, and the coincidence ratio of the actual plate shape and the target plate shape reaches more than 95%. By means of roller technology and high oil temperature regulation, volatilization of the foil oil film is increased, and then precise cutting corona is matched, so that the surface dyne value of the product is more than 32, the yield is improved by 10-15%, and the comprehensive yield is more than 80%. Meanwhile, the rolling process is continuous and stable, the production efficiency and the product quality are improved, the production cost of the battery foil is reduced, the method is a benefit growth point with the highest potential in the future, and technical support is provided for high-quality large-batch production of the battery foil.
Detailed Description
The present technology will be described in detail with reference to examples so that those skilled in the art can better understand the present technology, but the present technology is not limited to the following examples.
Example 1
A process for producing aluminum foil for a high-strength double-light lithium battery by four passes comprises the following steps:
step one, rough middle rolling, namely rough rolling rough materials with the thickness of 0.30 multiplied by 1200 mm of alloy 1100H18 in 2 passes and rough rolling in 1 pass to Shan Zhangbo with the thickness of 0.032mm, wherein the tensile strength of the blank is actually measured to be 195N/mm 2 Extending by 3.0%;
the quality requirements of the finished product are as follows: the thickness is 15 mu m plus or minus 3 percent, and the tensile strength is more than or equal to 250N/mm 2 The elongation is more than or equal to 3.5 percent, and the surface dyne value is more than or equal to 32dyn; plate-type leveling, off-line plate-type grade A (roll gap 2m, tension 8N/mm) 2 ) Collapse is less than or equal to 5mm; the surface color is uniform and clean; the pinhole number below 0.1mm is less than or equal to 10 pinholes/m 2 。
And (3) rolling pass distribution: 0.30mm, 0.140mm, 0.066mm, 0.032mm and 0.015mm;
the parameters of the roller used in the first step are as follows:
working roll roughness Ra of 0.26-0.28 mu m adopted in rough rolling 1-2 passes, and working roll convexity Cr:0.035mm (35%o);
roughness Ra of the work rolls in pass 3: 0.16-0.17 mu m, working roll convexity Cr:0.03mm (50%;
the roughness Ra of the backup roll used for rough intermediate rolling: 0.60-0.65 mu m, and the convexity Cr of the supporting roller: 0.04mm (40%;
rough rolling 1, 2 pass target plate shape curve value 13N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the Intermediate rolling 3-pass target plate profile curve value 11N/mm 2. 。
The rolling oil adopts 95# base oil, 3-5% ester additive and 3-5% alcohol additive to be evenly mixed as lubricating oil.
In the production process, the first pass speed of rough rolling is 800-850 m/min, and the oil temperature is 50 ℃. The plate type is stable, the superposition ratio of the actual plate type and the target plate type reaches 99%, the whole roll production has no broken belt, and the surface quality is good; the speed of the rough rolling second pass is 1000-1100 m/min, and the oil temperature is 52 ℃. The plate type is stable, the superposition ratio of the actual plate type and the target plate type reaches 99%, the whole roll production has no broken belt, and the surface quality is good; the speed of the third pass of the middle rolling is 1200-1300 m/min, and the oil temperature is 54 ℃. The plate type is stable, the superposition ratio of the actual plate type and the target plate type reaches 98%, the whole roll production has no broken belt, and the surface quality is good;
step two, rolling the obtained aluminum foil with the thickness of 0.032mm in a finishing mill for the 4 th pass to obtain a finished product of the double-sided light high-strength lithium battery foil with the thickness of 0.015mm;
the roughness of the used finishing roller is Ra 0.13-0.135 mu m, and the convexity is Cr:0.06mm (60%;
backing roll roughness Ra for finish rolling: 0.60-0.65 mu m, convexity Cr:0.04mm (40%;
finish pass targetThe plate profile value was set to 7N/mm 2 ；
The rolling oil adopts 95# base oil to prepare 5-7% of W3H additive;
in the production process, the 4 th pass speed of finish rolling is 1000-1200 m/min, and the oil temperature is 60 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 96%, the whole roll production has no broken belt, and the surface quality is good; the measured surface wetting tension of the blanking is 32 and 32dyn, the measured thickness is 15.05 mu m, and the tensile strength is 260N/mm 2 Elongation is 4.5%, pinhole number is less than 10/m 2 And the quality requirement of the battery foil is met by the finish rolling blanking inspection.
And thirdly, cutting, corona and packaging the finished product.
And (3) in the process of slitting by the slitting machine, the battery foil produced in the step two has flat plate shape, uniform plate surface waves and no rib loosening and partial loosening. The standard offline plate type detection collapse amount is less than or equal to 5mm, the A-stage plate type can be achieved according to the industry standard, and the quality requirement of the battery foil plate type is completely met.
In the process of cutting corona, the corona power parameters of the surfaces of the upper and lower aluminum foils are 8KW/8KW, the cutting speed is 120m/min, and the upper and lower surface wetting tension 34 and 34dyn are actually measured in the blanking process, so that the requirement of the surface wetting tension of the battery foil is met.
Example 2
A process for producing aluminum foil for a high-strength double-light lithium battery by four passes comprises the following steps:
step one, rough and medium rolling, namely rough rolling the blank with the thickness of 0.27 multiplied by 1200 mm for 2 times to Shan Zhangbo with the thickness of 0.026mm plus or minus 3 percent in 1 time, wherein the tensile strength of the blank is measured to be 197N/mm 2 Extending by 2.7%;
the quality requirements of the finished product are as follows: thickness 13 μm + -3%, tensile strength more than or equal to 240N/mm 2 The elongation rate is more than or equal to 3.0 percent, and the surface dyne value is more than or equal to 32dyn; plate-type leveling, off-line plate-type grade A (roll gap 2m, tension 8N/mm) 2 ) Collapse is less than or equal to 5mm; the surface color is uniform and clean; the pinhole number below 0.1mm is less than or equal to 10 pinholes/m 2 。
And (3) rolling pass distribution: 0.27 mm- > 0.128 mm- > 0.058 mm- > 0.026 mm- > 0.013mm;
the parameters of the roller used in the first step are as follows:
working roll roughness Ra of 0.26-0.28 mu m adopted in rough rolling 1-2 passes, and working roll convexity Cr:0.035mm (35%o);
roughness Ra of the work rolls in pass 3: 0.16-0.17 mu m, working roll convexity Cr:0.05mm (50%;
the roughness Ra of the backup roll used for rough intermediate rolling: 0.60-0.65 mu m, and the convexity Cr of the supporting roller: 0.04mm (40%;
rough rolling 1, 2 pass target plate shape curve value 13N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the Intermediate rolling 3-pass target plate profile curve value 11N/mm 2. 。
The rolling oil is prepared by uniformly mixing 95# base oil with 4-5% of ester additive and 3-5% of alcohol additive.
In the production process, the first pass speed of rough rolling is 800-900 m/min, and the oil temperature is 50 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 97%, the whole roll production has no broken belt, and the surface quality is good; the speed of the rough rolling second pass is 1000-1100 m/min, and the oil temperature is 50 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 98%, the whole roll production has no broken belt, and the surface quality is good; the speed of the third pass of the middle rolling is 1200-1300 m/min, and the oil temperature is 53 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 96%, the whole roll production has no broken belt, and the surface quality is good;
step two, rolling the obtained aluminum foil with the thickness of 0.026mm on a finishing mill for the 4 th pass to obtain a finished product of the double-sided light high-strength lithium battery foil with the thickness of 0.013mm;
the roughness of the used finishing roller is Ra 0.13-0.135 mu m, and the convexity is Cr:0.06mm (60%;
backing roll roughness Ra for finish rolling: 0.60-0.65 mu m, convexity Cr:0.04mm (40%;
setting the target plate profile value of the finish rolling pass to 7N/mm 2 ；
The rolling oil adopts 95# base oil to prepare 5-7% of W3H additive;
in the production process, the 4 th pass speed of finish rolling is 1000-1100 m/min, and the oil temperature is 63 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 95%, the whole roll production has no broken belt, and the surface quality is good; actually measured surface wetting sheet for blankingThe force is 31 and 32dyn, the measured thickness is 13.1 mu m, the tensile strength is 254N/mm 2 Elongation is 3.5%, pinhole number is less than 10/m 2 And the quality requirement of the battery foil is met by the finish rolling blanking inspection.
And thirdly, cutting, corona and packaging the finished product.
And (3) in the process of slitting by the slitting machine, the battery foil produced in the step two has flat plate shape, uniform plate surface waves and no rib loosening and partial loosening. The collapse amount of the standard offline plate type detection is less than or equal to 5mm, the A-plate type can be achieved according to the industry standard, the quality requirement of the battery foil plate type is completely met,
in the process of cutting corona, the corona power parameters of the surfaces of the upper and lower aluminum foils are 8KW/8KW, the cutting speed is 110m/min, and the upper and lower surface wetting tension is 33 and 34dyn in the actual measurement of blanking, so that the requirement of the surface wetting tension of the battery foil is met.
Example 3
A process for producing aluminum foil for a high-strength double-light lithium battery by four passes comprises the following steps:
step one, rough and medium rolling
Rough rolling the alloy 1100H18 with the thickness of 0.26 multiplied by 1200 mm in 2 passes and rolling to Shan Zhangbo with the thickness of 0.025mm plus or minus 3% in 1 pass, wherein the tensile strength of the blank is measured to be 197N/mm 2 Extending by 4.2%;
the quality requirements of the finished product are as follows: thickness of 12 μm + -3%, tensile strength of more than or equal to 240N/mm 2 The elongation rate is more than or equal to 3.0 percent, and the surface dyne value is more than or equal to 32dyn; plate-type leveling, off-line plate-type grade A (roll gap 2m, tension 8N/mm) 2 ) Collapse is less than or equal to 8mm; the surface color is uniform and clean; the pinhole number below 0.1mm is less than or equal to 10 pinholes/m 2 。
And (3) rolling pass distribution: 0.24 mm- & gt 0.115 mm- & gt 0.055 mm- & gt 0.024 mm- & gt 0.012mm;
the parameters of the roller used in the first step are as follows:
working roll roughness Ra of 0.26-0.28 mu m adopted in rough rolling 1-2 passes, and working roll convexity Cr:0.035mm (35%o);
roughness Ra of the work rolls in pass 3: 0.16-0.17 mu m, working roll convexity Cr:0.05mm (50%;
the roughness Ra of the backup roll used for rough intermediate rolling: 0.6-0.65 mu m, and the convexity Cr of the supporting roller: 0.04mm (40%;
rough rolling 1, 2 pass target plate shape curve value 13N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the Intermediate rolling 3-pass target plate profile curve value 11N/mm 2. 。
The rolling oil adopts 95# base oil, 3-5% ester additive and 3-5% alcohol additive to be evenly mixed as lubricating oil.
In the production process, the first pass speed of rough rolling is 800-850 m/min, and the oil temperature is 53 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 98%, the whole roll production has no broken belt, and the surface quality is good; the speed of the rough rolling second pass is 1000-1100 m/min, and the oil temperature is 53 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 98%, the whole roll production has no broken belt, and the surface quality is good; the speed of the third pass of the middle rolling is 1200-1300 m/min, and the oil temperature is 55 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 96%, the whole coil production has no broken belt, and the surface quality is good.
Step two, rolling the obtained aluminum foil with the thickness of 0.024mm on a finishing mill for the 4 th pass to obtain a finished product of the 0.012 mm-thick double-sided light high-strength lithium battery foil;
the roughness of the used finishing roller is Ra 0.13-0.135 mu m, convexity Cr:0.06mm (60%;
backing roll roughness Ra for finish rolling: 0.60-0.65 mu m, convexity Cr:0.04mm (40%;
setting the target plate profile value of the finish rolling pass to 7N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The rolling oil adopts 95# base oil to be matched with 5 to 7 percent of W3H additive;
in the production process, the 4 th pass speed of finish rolling is 1000-1100 m/min, and the oil temperature is 63 ℃. The plate shape is stable, the matching degree of the actual plate shape and the target plate shape reaches 95%, the whole roll production has no broken belt, and the surface quality is good; the measured surface wetting tension of the blanking is 30 and 31dyn, the measured thickness is 12.05μm, and the tensile strength is 252N/mm 2 Elongation is 3.35%, pinhole number is less than 10/m 2 And the quality requirement of the battery foil is met by the finish rolling blanking inspection.
And thirdly, cutting, corona and packaging the finished product.
And (3) in the process of slitting by the slitting machine, the battery foil produced in the step two has flat plate shape, uniform plate surface waves and no rib loosening and partial loosening. The collapse amount of the standard offline plate type detection is less than or equal to 5mm, the A-plate type can be achieved according to the industry standard, the quality requirement of the battery foil plate type is completely met,
in the process of cutting corona, the corona power parameters of the surfaces of the upper and lower aluminum foils are 8KW/8KW, the cutting speed is 100m/min, and the upper and lower surface wetting tension is 32 and 33dyn in the actual measurement of blanking, so that the requirement of the surface wetting tension of the battery foil is met.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. The process for producing the aluminum foil for the high-strength double-light lithium battery by four passes is characterized by comprising the following steps of:
A. the thickness of the blank is 0.26-0.3 mm, the hardness state H18 is that the content of the trace alloy element copper is adjusted from 0.05-0.1% to 0.1-0.15%;
B. the blank is subjected to distributed rolling according to a 4-pass process, wherein the rough rolling and the middle rolling are performed for 3 passes, and the finish rolling is performed for 1 pass; taking a blank with the thickness of 0.26mm as an example, rough rolling and middle rolling are arranged on the same rolling mill, 3-pass rolling is carried out to obtain an aluminum foil with the thickness of 0.025mm, 1-pass finish rolling is carried out to obtain a double-photocell foil with the thickness of 0.012mm, and the rolling passes are distributed as follows:
0.26mm→0.115mm→0.055mm→0.025mm→0.012mm；
C. cutting, corona, inspecting and packaging the finished product to obtain the finished product of the lithium battery foil.
2. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: the tensile strength of the blank in the step A is more than or equal to 195/mm 2 The performance elongation is more than or equal to 3.0 percent.
3. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: the alloy mark of the blank in the step A is 1100 alloy.
4. The process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein in step B, parameters of the rolls used in each pass are:
roughing work roll roughness was selected at Ra: between 0.26 and 0.28 mu m, convexity is selected from Cr:0.035mm;
the roughness of the middle rolling working roll is selected at Ra: between 0.16 and 0.17 mu m, convexity is selected from Cr:0.05mm;
coarseness Ra of backup roll used for rough and medium rolling: between 0.60 and 0.65 mu m, convexity is selected from Cr:0.04mm;
the target plate profile curve value of rough rolling pass is less than or equal to 13N/mm 2 The target plate profile curve value of the intermediate rolling pass is less than or equal to 11N/mm 2 。
5. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: the rolling oil used in the first 3 passes in the step B is formed by mixing 95# base oil with alcohol and ester additives, wherein the alcohol content in the additives is 3-5% by mass and takes C12 lauryl alcohol as the main component; the content of the ester is 3-5 percent, and the butyl stearate is the main component.
6. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: in the step B, the temperature of the rolling oil is controlled to be 50-55 ℃ in the first 3-pass rolling.
7. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: taking a single aluminum foil with the thickness of 0.025mm obtained by medium rolling as an example, wherein the roughness of the finish rolling working roller is Ra of 0.12-0.13 mu m, and convexity Cr:0.06mm; finishing mill backing roll roughness Ra: 0.60-0.65 mu m, convexity Cr0.04mm; the target plate profile curve value of the finish rolling pass is less than or equal to 7N/mm 2 。
8. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: the rolling oil used in the 4 th pass of finish rolling in the step B is 95# base oil and 5-7% of ester additive W3H, wherein the ester content in the additive W3H is 70%, and the rolling oil is purchased from Shijia Xintai special oil Co.
9. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: and in the step B, the temperature of the rolling oil is controlled to be 60-65 ℃ in the 4 th pass rolling.
10. The four-pass process for producing aluminum foil for high-strength double-light lithium battery according to claim 1, wherein: and C, carrying out surface corona by adopting corona equipment with the power of 7-10 kW and the output voltage of 25 kV.
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| CN116851444A (en) * | 2023-07-21 | 2023-10-10 | 陇西西北铝铝箔有限公司 | Preparation method of uniform matte battery foil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116851444A (en) * | 2023-07-21 | 2023-10-10 | 陇西西北铝铝箔有限公司 | Preparation method of uniform matte battery foil |
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