CN117230348B - 1100B high-strength battery foil and preparation method thereof - Google Patents
1100B high-strength battery foil and preparation method thereof Download PDFInfo
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- 239000011888 foil Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 52
- 238000007670 refining Methods 0.000 claims abstract description 39
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 29
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 238000005097 cold rolling Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 9
- 230000007547 defect Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000003851 corona treatment Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 abstract description 3
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 239000011159 matrix material Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000005012 migration Effects 0.000 description 5
- 238000013508 migration Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000010731 rolling oil Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
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- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical group [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
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- 238000001228 spectrum Methods 0.000 description 2
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Abstract
The invention discloses 1100B high-strength battery foil and a preparation method thereof, and belongs to the technical field of aluminum alloy preparation. 1100B high-strength battery foil comprises the following components in percentage by mass: si:0.1% -0.2%, fe:0.40% -0.55%, cu:0.10% -0.15%, mn: less than or equal to 0.05 percent, mg:0.04% -0.08%, zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, ti: less than or equal to 0.03 percent, single impurity element less than or equal to 0.03 percent, and the balance of aluminum. The preparation method of the 1100B high-strength battery foil comprises the following steps: batching, smelting, refining, filtering, casting and rolling, cold rolling, foil rolling, slitting, packaging and warehousing. The aluminum foil is subjected to homogenization annealing treatment in the cold rolling process. The 1100B high-strength battery foil and the preparation method thereof can solve the problem of low tensile strength of the existing aluminum foil.
Description
Technical Field
The invention relates to the technical field of aluminum alloy preparation, in particular to 1100B high-strength battery foil and a preparation method thereof.
Background
The development of green and environment-friendly new energy is an important power resource and development foundation for promoting human survival and sustainable and healthy development of global economy. The lithium ion battery has the important advantages of high voltage and high capacity, and is a green and environment-friendly new energy material with the most development prospect at present, and the cycle life is long and the safety performance is good. Lithium ion batteries are widely applied to portable electronic equipment, electric automobiles, space technology, national defense industry and other aspects, and are research hotspots in recent years. With the development requirements of high-efficiency lithium ion batteries with higher energy density and higher safety, the quality and performance of key constituent materials of the lithium ion batteries are continuously improved. The aluminum foil material for the positive electrode current collector has the most important index, namely mechanical property, besides continuously improving the requirements on plate shape quality, surface quality and surface cleanliness, and continuously improving the tensile strength and the elongation. The tensile strength of the existing 1070/1060 alloy series is 190-220MPa, and the tensile strength of the 1235 alloy series is 240-260MPa, but the tensile strength can not meet the requirement of the battery aluminum foil on higher tensile strength.
Disclosure of Invention
The invention aims to provide a 1100B high-strength battery foil and a preparation method thereof, which solve the problem of low tensile strength of the existing aluminum foil.
In order to achieve the above purpose, the invention provides a 1100B high-strength battery foil, which comprises the following components in percentage by mass: si:0.1% -0.2%, fe:0.40% -0.55%, cu:0.10% -0.15%, mn: less than or equal to 0.05 percent, mg:0.04% -0.08%, zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, ti: less than or equal to 0.03 percent, less than or equal to 0.03 percent of other single impurity elements and the balance of aluminum.
Preferably, the mass percentage of aluminum is more than or equal to 99 percent.
The preparation method of the 1100B high-strength battery foil comprises the following steps:
S1, batching, namely weighing corresponding raw materials according to component design;
S2, smelting, namely putting the prepared raw materials into a smelting furnace for smelting;
s3, refining, namely refining the aluminum alloy liquid after the aluminum alloy liquid is completely melted;
S4, filtering, namely performing double filtration by adopting an RB-level tubular filter box and a ceramic filter disc;
S5, casting and rolling, namely pouring the filtered aluminum alloy liquid into a casting and rolling machine through a flow groove to perform continuous casting and rolling to obtain a cast and rolled plate with the thickness of 6.5-8.0 mm;
s6, cold rolling, namely cold rolling the cast-rolled sheet, wherein homogenizing annealing treatment is carried out in the cold rolling process, and the thickness of the cold-rolled sheet with the finished product of 0.2-0.3mm is obtained after cold rolling;
s7, foil rolling, namely foil rolling the cold-rolled sheet to obtain a foil with the thickness of 0.012-0.015 mm;
s8, slitting, namely putting the foil into a slitting machine for slitting, and detecting pinhole defects of the product by an aluminum foil through a pinhole detector in the slitting process; fine cutting is carried out after cutting, and surface corona treatment is carried out in the fine cutting process;
S9, packaging and warehousing.
Preferably, in the step S1, the raw materials include aluminum alloy scraps with a mass percentage not higher than 25%, and the rest aluminum is pure aluminum ingots.
Preferably, in the step S3, pure argon is used to spray a refining agent into the melt for refining, and the refining times are as follows: refining in a smelting furnace for 1-2 times, standing for 1-2 times, and performing overcurrent refining when pouring; refining time: smelting furnace is more than or equal to 30 min/time, and standing furnace is more than or equal to 20 min/time; refining frequency: 4-5 h/time; refining temperature: not less than 730 ℃; the hydrogen content in the aluminum alloy is less than or equal to 0.12ml/100gAl.
Preferably, the refining agent is a sodium potassium based chloride refining agent.
Preferably, in the step S5, the casting speed is 900+/-50 mm/min, the length of a casting area is 55-70mm, and the temperature of the roll surface is 70-110 ℃; the same plate difference of the obtained cast-rolled plate is 0-0.03mm, the longitudinal plate difference is 0-0.12mm, and the convexity is 0-0.05mm.
Preferably, in the step S6, the reduction pass of the cold rolling is (6.5-8.0) mm- (3.5-4.6) mm- (2.0-2.5) mm-homogenizing annealing- (1.0-1.3) mm- (0.55-0.75) mm- (0.3-0.4) mm- (0.2-0.3) mm; the homogenizing annealing temperature is 500-560 ℃ and the heat preservation time is 18-22 h.
Preferably, in the step S7, the reduction pass with the thickness of the foil of 0.015mm is (0.2-0.3) mm- (0.11-0.14) mm- (0.055-0.070) mm- (0.030-0.038) mm-0.020mm-0.015mm.
Preferably, in the step S7, the reduction pass with the thickness of the foil of 0.012mm is (0.2-0.3) mm- (0.11-0.14) mm- (0.043-0.065) mm- (0.030-0.034) mm-0.018-0.012 mm.
The 1100B high-strength battery foil and the preparation method thereof have the advantages and positive effects that:
1. According to the invention, the contents of Fe and Si are improved in the aluminum alloy, the content ratio of alpha phase, beta phase and Al 3 Fe hard phase is increased, and under the condition of multi-pass rolling strong plastic deformation, the hard phases can be dispersed and distributed in a matrix after being crushed, so that the tensile strength can be improved, and the elongation rate can be enhanced.
2. According to the invention, the content of Cu element is improved, the Cu element generates a second phase such as Al 6 (Cu, fe) phase, al 7Cu2 Fe phase, al (Cu, fe) Si phase and the like in the aluminum alloy, the aluminum foil is subjected to multi-pass strong plastic deformation, the second phase is crushed, so that the aluminum foil is uniformly distributed in an aluminum matrix, nucleation is promoted through particles, recrystallization power is promoted, fine grains are formed, and the mechanical property is improved.
3. According to the invention, the content of Mg element is improved, the solid solubility of the Mg element in aluminum is high, solid solution strengthening is easy to generate, the Mg and Si have better binding force, a fine dispersed Mg 2 Si strengthening phase is separated out, and the migration of grain boundaries is blocked by generating a Zener pinning effect in the annealing process, so that the mechanical property is improved.
4. According to the invention, the homogenization annealing is carried out in the cold rolling intermediate pass, and the alloy element is subjected to solid solution in the homogenization annealing process, so that the alloy element is dissolved in the aluminum matrix, the work hardening in the subsequent processing process is reduced, the subsequent precipitated second phase is more uniformly dispersed, and the tensile strength and the elongation of the aluminum alloy are improved. In addition, the homogenizing annealing can lead the aluminum alloy structure and components to be more uniform and stable through atomic diffusion and migration, and eliminate segregation.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a photograph of a second phase scanning electron microscope of a 1100B high strength battery foil cast-rolled plate according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a graph of a second phase energy spectrum component analysis of a 1100B high-intensity battery foil according to the present invention;
fig. 4 is a diagram showing a second phase energy spectrum component analysis of a 1100B high-strength battery foil according to the present invention.
Detailed Description
The technical scheme of the invention is further described below through the attached drawings and the embodiments.
1100B aluminum alloy: based on the components of the national standard 1100 alloy grade aluminum alloy, the alloy components are adjusted, and finally the pure aluminum content is not less than 99.00 percent, which is marked as 1100B different from the 1100 alloy grade.
The conventional aluminum foil for lithium batteries requires the tensile strength to be in the range of 190-240Mpa, and cannot meet the requirement of high tensile strength of the aluminum foil. How to ensure the purity of the aluminum to be more than 99 percent and improve the tensile strength of the double-sided light aluminum foil has great difficulty for the design of alloy components.
A 1100B high strength battery foil comprising the following components in percentage by mass: si:0.1% -0.2%, fe:0.40% -0.55%, cu:0.10% -0.15%, mn: less than or equal to 0.05 percent, mg:0.04% -0.08%, zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, ti: less than or equal to 0.03 percent, less than or equal to 0.03 percent of other single impurity elements and the balance of aluminum.
The mass percentage of aluminum is more than or equal to 99 percent.
The 1100B alloy is added with more Fe, si elements and a certain amount of Cu, and a certain amount of Mg. The content of Fe and Si is improved, the content ratio of alpha phase, beta phase and Al 3 Fe hard phase is increased, and under the condition of multi-pass rolling strong plastic deformation, the hard phases can be dispersed and distributed in a matrix after being crushed, so that the tensile strength can be improved, and the extensibility can be enhanced.
The Cu element generates Al 6 (Cu, fe) phase, al 7Cu2 Fe phase, al (Cu, fe) Si phase and other second phases in the aluminum alloy, the aluminum foil is subjected to multi-pass strong plastic deformation, the second phases are crushed, so that the second phases are uniformly distributed in an aluminum matrix, the coarser second phases (more than 1 mu m) are subjected to particle nucleation (PSN) promotion, recrystallization power is promoted, fine grains are formed, and the mechanical property is promoted.
The solid solubility of Mg alloy elements in aluminum is large, solid solution strengthening is easy to generate, mg and Si have better binding force, a fine dispersed Mg 2 Si strengthening phase is separated out, and the migration of grain boundaries is blocked by generating a Zener pinning effect in the annealing process, so that the mechanical property is improved. In addition, the homogenizing annealing can lead the aluminum alloy structure and components to be more uniform and stable through atomic diffusion and migration, and eliminate segregation.
The preparation method of the 1100B high-strength battery foil comprises the following steps:
s1, proportioning, and weighing corresponding raw materials according to component design.
The raw materials comprise aluminum alloy scraps with the mass percentage not higher than 25 percent, and the rest aluminum is pure aluminum ingots. Higher scrap ratios affect melt quality.
S2, smelting, namely putting the prepared raw materials into a smelting furnace for smelting.
The Mg element is added in the form of Mg ingot or AlMg master alloy. Because the density of Mg is lighter and the burning loss is larger, the addition amount of Mg alloy elements is controlled to be higher than the upper limit.
S3, refining, namely refining the aluminum alloy liquid after the aluminum alloy liquid is completely melted.
The furnace burden is kept clean, the melt quality is good, and the production requirement of aluminum foil is met. Adopting pure argon to spray refining agent into melt for refining, wherein the refining times are as follows: refining in a smelting furnace for 1-2 times, standing for 1-2 times, and performing overcurrent refining when pouring. Refining time: smelting furnace is more than or equal to 30 min/time, and standing furnace is more than or equal to 20 min/time; refining frequency: 4-5 h/time. Refining temperature: and the temperature is more than or equal to 730 ℃.
The refining adopts powder spraying refining. The refining agent is sodium-potassium based chloride refining agent. Because cci 4 reacts with Mg, mg alloying elements are consumed and cci 4 is not used for refining.
In the refining process, the hydrogen content in the aluminum solution is controlled to be less than or equal to 0.12ml/100gAl.
S4, filtering, namely performing double filtration by adopting an RB-level tubular filter box and a ceramic filter disc.
S5, casting and rolling, and injecting the filtered aluminum alloy liquid into a casting and rolling machine through a flow groove to perform continuous casting and rolling to obtain a cast and rolled plate with the thickness of 6.5-8.0 mm.
The casting speed is 900+/-50 mm/min, the length of a casting area is 55-70mm, and the temperature of the roll surface is 70-110 ℃. The same plate difference of the obtained cast-rolled plate is 0-0.03mm, the longitudinal plate difference is 0-0.12mm, and the convexity is 0-0.05mm. Detecting a round plate shape of the rear cutting roller of the vertical plate, and rolling a finished product roll after the plate shape is qualified; detecting online plate shapes every two rolls; detecting offline plate shape of each roll of cast-rolled stock; and cutting the product into a circle after 10 rolls are produced, and rechecking whether the product is qualified.
S6, cold rolling, namely cold rolling the cast-rolled sheet, wherein homogenizing annealing treatment is carried out in the cold rolling process, and the thickness of the cold-rolled sheet with the finished product of 0.2-0.3mm is obtained after cold rolling.
The cold rolling reduction pass is (6.5-8.0) mm- (3.5-4.6) mm- (2.0-2.5) mm-homogenizing annealing- (1.0-1.3) mm- (0.55-0.75) mm- (0.3-0.4) mm- (0.2-0.3) mm.
The homogenizing annealing temperature is 500-560 ℃ and the heat preservation time is 18-22 h. The alloy element is in solid solution in the homogenizing annealing process, so that the alloy element is in solid solution in the aluminum matrix, the work hardening in the subsequent processing process is reduced, the subsequent precipitated second phase is more uniformly dispersed, and the tensile strength and the elongation of the aluminum alloy are improved. In addition, the homogenizing annealing can lead the aluminum alloy structure and components to be more uniform and stable through atomic diffusion and migration, and eliminate segregation.
The process parameters for cold rolling are shown in table 1.
TABLE 1 1100B high strength battery foil cold rolling process parameters
Plate shape quality control during cold rolling:
① After each working roll replacement, the preheating roll is maintained for more than 10 minutes, and 2-3 rolls of thick materials are produced before the finished product passes, so that the thermal convexity of the roll is improved, and the roll shape is stabilized.
② When the rollers are replaced and maintained regularly, the normal plate shape control system is ensured.
Surface quality control during cold rolling:
① The coil is cleaned before feeding, so that no dust and foreign matters are ensured.
② The roller is cleaned when the roller is replaced, and the five rollers, the guide roller and the plate type roller are cleaned before production.
③ Before the finished product is discharged, whether the state of the roller meets the surface requirement of the product is confirmed, and the first pass of the finished product is checked to see whether the surface has defects such as roller marks, surface stripes and the like, so that batch surface defects are avoided.
④ Ensuring the normal rolling oil filtration system to ensure the rolling surface quality.
S7, foil rolling, namely foil rolling the cold-rolled sheet to obtain the double-sided smooth foil with the thickness of 0.012-0.015 mm.
The plate shape requirement does not allow for obvious plate shape defects such as edge looseness, intermediate looseness, edge collapse, lotus leaf edge and the like, and even requires that under the condition of low tension, no local plate shape quality defects exist. Under the tension of 0.8kgf/mm 2 as the detection standard of the plate shape detector, the collapse amount is less than or equal to 2mm. For aluminum alloys with high tensile strength and high work hardening, control of the plate shape during rolling is more difficult.
The reduction pass with the foil thickness of 0.015mm is (0.2-0.3) mm- (0.11-0.14) mm- (0.055-0.070) mm- (0.030-0.038) mm-0.020mm-0.015mm.
The reduction pass with the foil thickness of 0.012mm is (0.2-0.3) mm- (0.11-0.14) mm- (0.043-0.065) mm- (0.030-0.034) mm-0.018-0.012 mm.
The final pass rolls are shown in table 2.
Table 2 1100b high strength battery foil finished pass mill roll conditions
| Thickness of finished product is mm | Roller convexity mill | Roll roughness (Ra) μm |
| 0.015 | 65 | 0.12-0.15 |
| 0.012 | 65 | 0.10-0.13 |
The rolling oil requirements during foil rolling are shown in table 3.
Table 3 110 b rolling oil requirements in high strength battery foil rolling production
S8, slitting, namely putting the foil into a slitting machine for slitting, and dividing the aluminum foil into small rolls of 10000-20000 m. In the slitting process, the pinhole defect of the product is detected by the aluminum foil through a pinhole detector, so that the pinhole quality of the product is ensured to be good. And in the slitting process, the oil is removed by a baking surface oil removing device, so that the oil quantity on the surface of the aluminum foil is reduced. And (3) carrying out fine cutting after cutting, and carrying out surface corona treatment in the fine cutting process so as to improve the index of the surface dyne value of the aluminum foil.
The surface of the aluminum foil is required to have no large-area residual oil, the surface wetting tension reaches 33 dynes, obvious oil lines and oil points are not allowed to exist, and surface quality defects such as scratches, damage, bright spots and the like are not allowed to exist. The aluminum foil has the phenomena of high tensile strength, high processing hardening degree, high speed in production, uncontrolled plate shape and the like, and the difficulty is increased for meeting the surface quality requirement of the product.
S9, packaging and warehousing.
As shown in FIG. 1 and FIG. 2, more second phases exist in the cast-rolled plate, the main forms are irregular strip-shaped and spherical distribution, the length of the strip-shaped distribution is generally less than or equal to 10 mu m, the width is generally less than or equal to 2 mu m, and a small amount of second phases with the length of 15 mu m or the width of 4-5 mu m exist. The second phase is deformed to a certain extent due to a certain rolling force during the casting, rolling and solidification. The second phases are crushed into smaller sizes after being subjected to subsequent cold rolling and foil rolling for multiple times, so that the second phases are uniformly distributed in an aluminum plate or an aluminum foil, and the mechanical property is improved.
The spectral components of each detection position in fig. 3 were analyzed, and the results are shown in table 4. The spectral components of each detection position in fig. 4 were analyzed, and the results are shown in table 5.
Table 4 results of analysis of spectral components at the detection sites of FIG. 3
Table 5 results of analysis of spectral components at the detection sites of FIG. 4
According to the result of energy spectrum analysis, the phases in the aluminum matrix are AlFeCuSi quaternary phases. Because the Mg content is less than 0.1%, mg is present in the aluminum matrix in solid solution or dispersed in the aluminum matrix in a form of a second phase of smaller size.
The present invention will be further described with reference to the following examples, which are given by way of illustration of detailed embodiments and specific procedures, but the scope of the present invention is not limited to the following examples. The composition ratios of the aluminum alloys in examples 1 to 4 are shown in Table 6.
Table 6 table 1100b composition table of high strength battery foil examples
| Alloying element | Si | Fe | Cu | Mn | Mg | Zn | V | Ti | Al |
| Example 1 | 0.19 | 0.55 | 0.10 | ＜0.01 | 0.043 | 0.01 | 0.001 | 0.017 | Allowance of |
| Example two | 0.16 | 0.47 | 0.15 | ＜0.01 | 0.058 | 0.02 | 0.01 | 0.02 | Allowance of |
| Example III | 0.10 | 0.54 | 0.14 | ＜0.01 | 0.069 | 0.01 | 0.01 | 0.026 | Allowance of |
| Example IV | 0.17 | 0.42 | 0.14 | ＜0.01 | 0.078 | 0.03 | 0.005 | 0.015 | Allowance of |
The aluminum alloy of the above example was rolled into a double-sided polished aluminum foil with a thickness of 0.015mm and 0.012mm by the above preparation method, and the mechanical properties were measured, and the results are shown in Table 7.
Table 7 mechanical properties of 1100b high strength battery foil examples
The aluminum foil with the thickness of 0.015mm prepared by the 1100B high-strength battery foil and the preparation method thereof has the tensile strength of more than or equal to 280MPa and the elongation rate of more than or equal to 1.8%; the prepared double-sided light aluminum foil with the thickness of 0.012mm has the tensile strength of more than or equal to 284MPa and the elongation of more than or equal to 1.5 percent. The tensile strength of the produced aluminum foil is greatly improved on the basis of ensuring the elongation.
The 1100B high-strength battery foil produced by the invention is suitable for lithium ion battery current collectors, and is mainly applied to the fields of batteries for digital electronic products such as mobile phones, tablets, notebook computers and the like, lithium battery energy storage batteries, batteries for new energy power automobiles and the like.
Therefore, the 1100B high-strength battery foil and the preparation method thereof can solve the problem of low tensile strength of the existing aluminum foil.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (7)
1. A 1100B high strength battery foil, characterized by: comprises the following components in percentage by mass: si:0.1% -0.2%, fe:0.47% -0.54%, cu:0.10% -0.15%, mn: less than or equal to 0.05 percent, mg:0.069% -0.08%, zn: less than or equal to 0.05 percent, V: less than or equal to 0.05 percent, ti: less than or equal to 0.03 percent, single impurity element less than or equal to 0.03 percent, and the balance of aluminum; the preparation method of the 1100B high-strength battery foil comprises the following steps:
S1, batching, namely weighing corresponding raw materials according to component design;
S2, smelting, namely putting the prepared raw materials into a smelting furnace for smelting;
s3, refining, namely refining the aluminum alloy liquid after the aluminum alloy liquid is completely melted;
S4, filtering, namely performing double filtration by adopting an RB-level tubular filter box and a ceramic filter disc;
S5, casting and rolling, namely pouring the filtered aluminum alloy liquid into a casting and rolling machine through a flow groove to perform continuous casting and rolling to obtain a cast and rolled plate with the thickness of 6.5-8.0 mm;
s6, cold rolling, namely cold rolling the cast-rolled sheet, wherein homogenizing annealing treatment is carried out in the cold rolling process, and the thickness of the cold-rolled sheet with the finished product of 0.2-0.3mm is obtained after cold rolling;
s7, foil rolling, namely foil rolling the cold-rolled sheet to obtain a foil with the thickness of 0.012-0.015 mm;
s8, slitting, namely putting the foil into a slitting machine for slitting, and detecting pinhole defects of the product by an aluminum foil through a pinhole detector in the slitting process; fine cutting is carried out after cutting, and surface corona treatment is carried out in the fine cutting process;
S9, packaging and warehousing;
In the step S6, the reduction pass of cold rolling is (6.5-8.0) mm- (3.5-4.6) mm- (2.0-2.5) mm-homogenizing annealing- (1.0-1.3) mm- (0.55-0.75) mm- (0.3-0.4) mm- (0.2-0.3) mm; the homogenizing annealing temperature is 500-560 ℃ and the heat preservation time is 18-22 h.
2. A 1100B high strength battery foil as claimed in claim 1, wherein: the mass percentage of the aluminum is more than or equal to 99 percent.
3. A 1100B high strength battery foil as claimed in claim 1, wherein: in the step S1, the raw materials comprise aluminum alloy scraps with the mass percent not higher than 25%, and the rest aluminum is pure aluminum ingots.
4. A 1100B high strength battery foil as claimed in claim 1, wherein: in the step S3, pure argon is adopted to spray a refining agent into the melt for refining, and the refining times are as follows: refining in a smelting furnace for 1-2 times, standing for 1-2 times, and performing overcurrent refining when pouring; refining time: smelting furnace is more than or equal to 30 min/time, and standing furnace is more than or equal to 20 min/time; refining frequency: 4-5 h/time; refining temperature: not less than 730 ℃; the hydrogen content in the aluminum alloy is less than or equal to 0.12ml/100gAl.
5. A 1100B high strength battery foil as claimed in claim 1, wherein: in the step S5, the casting and rolling speed is 900+/-50 mm/min, the length of a casting and rolling area is 55-70mm, and the temperature of the roll surface is 70-110 ℃; the same plate difference of the obtained cast-rolled plate is 0-0.03mm, the longitudinal plate difference is 0-0.12mm, and the convexity is 0-0.05mm.
6. A 1100B high strength battery foil as claimed in claim 1, wherein: in the S7, the reduction pass with the thickness of the foil of 0.015mm is (0.2-0.3) mm- (0.11-0.14) mm- (0.055-0.070) mm- (0.030-0.038) mm-0.020mm-0.015mm.
7. A 1100B high strength battery foil as claimed in claim 1, wherein: in S7, the reduction pass with the thickness of 0.012mm is (0.2-0.3) mm- (0.11-0.14) mm- (0.043-0.065) mm- (0.030-0.034) mm-0.018mm-0.012mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358311A (en) * | 2007-07-19 | 2009-02-04 | 古河Sky株式会社 | Aluminum alloy brazing sheet having high-strength and production method therefore |
| CN109161730A (en) * | 2018-09-28 | 2019-01-08 | 华北电力大学 | Bus duct aluminum-alloy conductor material and preparation method thereof |
| CN111793759A (en) * | 2020-08-11 | 2020-10-20 | 华北铝业有限公司 | 1070 high-performance aluminum foil for lithium ion battery and preparation method thereof |
| CN113564425A (en) * | 2021-08-09 | 2021-10-29 | 江苏鼎胜新能源材料股份有限公司 | Aluminum foil for 1N00 lithium battery and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT410946B (en) * | 2001-11-07 | 2003-08-25 | Miba Gleitlager Gmbh | ALUMINUM ALLOY FOR A SLIDE ELEMENT |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358311A (en) * | 2007-07-19 | 2009-02-04 | 古河Sky株式会社 | Aluminum alloy brazing sheet having high-strength and production method therefore |
| CN109161730A (en) * | 2018-09-28 | 2019-01-08 | 华北电力大学 | Bus duct aluminum-alloy conductor material and preparation method thereof |
| CN111793759A (en) * | 2020-08-11 | 2020-10-20 | 华北铝业有限公司 | 1070 high-performance aluminum foil for lithium ion battery and preparation method thereof |
| CN113564425A (en) * | 2021-08-09 | 2021-10-29 | 江苏鼎胜新能源材料股份有限公司 | Aluminum foil for 1N00 lithium battery and preparation method thereof |
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