CN115084750A - Preparation method of high-strength high-extensibility battery soft package aluminum-plastic film - Google Patents
Preparation method of high-strength high-extensibility battery soft package aluminum-plastic film Download PDFInfo
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- 239000002985 plastic film Substances 0.000 title claims abstract description 35
- 229920006255 plastic film Polymers 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 133
- 239000011888 foil Substances 0.000 claims abstract description 70
- 238000000137 annealing Methods 0.000 claims abstract description 44
- 238000005098 hot rolling Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 238000010008 shearing Methods 0.000 claims abstract description 12
- 238000005097 cold rolling Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 33
- 238000004321 preservation Methods 0.000 claims description 26
- 238000005520 cutting process Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000003801 milling Methods 0.000 claims description 14
- 230000001965 increasing effect Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000001953 recrystallisation Methods 0.000 claims description 8
- 238000009966 trimming Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 229910052787 antimony Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 230000007547 defect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910001245 Sb alloy Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002140 antimony alloy Substances 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
- H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
- H01M50/222—Inorganic material
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- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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Abstract
The invention provides a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film, which comprises the following steps: s1, smelting: putting materials into a smelting furnace according to the components for smelting, wherein Si0.02-0.06%; sb is less than or equal to 0.07 percent, and the mass ratio of Sb to Si is 0.5-4; s2, casting: forming a cast ingot by a casting machine; s3, sawing; s4, homogenizing and heat treating; s5, hot rolling; s6, cold rolling: comprises a cold rough rolling procedure and a cold finish rolling procedure; s7, foil rolling; s8, splitting and shearing; and S9, annealing the finished product. According to the preparation method, the components are optimized, the mass ratio of Sb to Si in the components is determined to be 0.5-4, and the final finished product has excellent mechanical properties by the steps of sawing the cast ingot, preheating before hot rolling, optimizing the process parameters of finished product annealing and the like, so that the preparation method is more favorable for application to battery soft packages.
Description
Technical Field
The invention relates to a preparation method of a battery soft package aluminum-plastic film, in particular to a preparation method of a high-strength high-extensibility battery soft package aluminum-plastic film.
Background
In recent years, the industries of new energy automobiles, smart phones and tablet personal computers are developing vigorously, and with the vigorous development of the lithium battery industry, the soft package battery is gradually applied to the fields of new energy automobiles, energy storage and the like due to the characteristics of good ductility and high energy density. The soft package battery constitutes the main downstream source demand of the aluminum-plastic film, and the aluminum-plastic film has the advantages of light weight, high battery mass specific energy, high space utilization rate and the like compared with a steel shell and an aluminum shell, but the quality requirement on the aluminum-plastic film is higher.
At present, the aluminum plastic film has the defects of poor surface quality, insufficient mechanical property and the like, so that the tape breaking is caused, the resource waste is caused, and the enterprise cost is increased.
Disclosure of Invention
In order to overcome the defects of poor surface quality, insufficient mechanical property and the like of the aluminum-plastic film in the prior art, the preparation method of the high-strength high-elongation battery soft package aluminum-plastic film is provided.
The specific scheme is as follows:
a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film comprises the following steps:
s1, smelting: feeding materials into a smelting furnace according to the components for smelting, wherein Si is 0.02-0.06%; sb is less than or equal to 0.07 percent, and the mass ratio of Sb to Si is 0.5-4; sb is a poor conductor of electricity and heat, is not easy to oxidize at normal temperature and has corrosion resistance, the hardness can be increased by adding Sb into the alloy, and the finished aluminum-plastic film finally obtains excellent mechanical property by adjusting the mass ratio of Sb to Si in the alloy;
s2, casting: forming a cast ingot by a casting machine;
s3, sawing: sawing the cast ingot in the step S2, specifically, cutting off the head part of the cast ingot, namely the gate part by about 120mm, milling the upper and lower large surfaces of the cast ingot, wherein the milling amount is 10-15 mm, and the side surface is not milled; the purpose of ingot sawing and milling is to remove the defects of cold shut, microcrack, segregation nodule, slag inclusion and the like on the surface layer of the ingot and to obtain a smooth and flat ingot surface after milling, thereby avoiding the defects of rough surface, peeling, surface crack, foaming and the like after the hot rolling process.
S4, homogenizing heat treatment: setting the annealing temperature to be 490-620 ℃, keeping the temperature for 5-13 h, and naturally cooling after discharging; the homogenizing annealing is to make elements in the alloy generate solid diffusion, reduce the condition of uneven chemical components, mainly reduce the unevenness of the chemical components in the grain size, improve the structural defects and residual stress caused in the casting process and prevent the deformation and cracking of the workpiece; meanwhile, the homogenization heat treatment also helps to improve the elongation of the material.
S5, hot rolling: preheating before hot rolling, controlling the temperature of furnace gas to be 480-520 ℃, keeping the temperature for 10-12 hours, and performing multi-pass rolling by using a hot rolling mill after preheating; during hot rolling, the deformed metal has the processes of hardening and softening simultaneously, and due to the influence of the deformation speed, if recovery and recrystallization cannot be carried out in time, the metal can generate certain work hardening along with the increase of the deformation degree, the deformation resistance can be reduced by preheating, the metal deformation energy consumption is greatly reduced, the rolling efficiency is improved, the rolling is optimized, and meanwhile, higher finish rolling temperature can be kept to obtain excellent mechanical performance;
s6, cold rolling: comprises a cold rough rolling procedure and a cold finish rolling procedure;
s7, foil rolling: transferring the aluminum foil after finish rolling into foil rolling process production, wherein the foil rolling is subjected to three rolling processes of rough rolling, intermediate rolling and finish rolling; and after the intermediate rolling, and then finish rolling by using an aluminum foil to obtain the single-sided smooth aluminum foil with a uniform and fine surface, wherein the upper surface is a bright surface, and the lower surface is a dark surface, so that the oil can be removed, the pollution to the aluminum foil is reduced, and the wettability of the surface of the aluminum foil is improved.
S8, splitting and cutting: after foil rolling, splitting and shearing are carried out through a splitting machine;
and S9, annealing the finished product.
Preferably, the specific process parameters of annealing of the finished product of S9 are as follows: the temperature is increased to 180-280 ℃ from the initial temperature within 0-10 h, the heat is preserved for 8-12 h, after the heat preservation is finished, the temperature is increased to 285-350 ℃ within 0-10 h, the heat is preserved for 20-40 h, after the heat preservation is finished, the temperature is reduced to 350-285 ℃ within 0-5 h, the heat is preserved for 20-40 h, and after the heat preservation is finished, the temperature is reduced to the initial temperature within 0-10 h. The purpose of the final annealing is on the one hand to carry out surface degreasing. The surface wettability is improved after oil removal, and on the other hand, the final finished product has excellent mechanical properties.
Preferably, the cold rough rolling process in S6 specifically comprises the following steps: cogging, carrying out multi-pass rolling, carrying out intermediate recrystallization annealing after trimming, setting the temperature to be 300-450 ℃, and carrying out heat preservation for about 1-2 hours by adopting a differential temperature ratio method, wherein the total annealing time is 10-15 hours, the roughness Ra is 0.4-0.7 mu m, and the convexity of a working roll is 0.02 mm; the temperature of the furnace gas can be quickly increased through the difference between the temperature of the furnace gas and the temperature of the metal, so that the temperature of the metal is increased, the annealing time is shortened, and the production efficiency is improved.
Preferably, the cold finish rolling in S6 specifically comprises the following steps: and cooling the aluminum coil subjected to the cold rough rolling to the normal temperature for finish rolling, wherein the roughness Ra is 0.2-0.4 mu m, and the convexity of the working roll is 0.06 mm.
Preferably, the roughness of the work roll in the rough rolling in S7 is 0.2 to 0.3 μm, the roughness of the work roll in the medium rolling is 0.1 to 0.2 μm, and the roughness of the work roll in the finish rolling is 0.05 to 0.09 μm.
Preferably, the mass percent of the rest components in S1 is Fe 1.3-1.7%, Cu is less than or equal to 0.05%, Mn is less than or equal to 0.03%, Zn is less than or equal to 0.05%, Ti is less than or equal to 0.02%, B is less than or equal to 0.005%, Mg is less than or equal to 0.0006%, and the balance is Al.
Preferably, the shearing process in the step S8 includes pre-slitting and fine-cutting, the pre-slitting divides the coil into two halves, which can eliminate the plate-shaped internal stress and ensure the quality of the cut edge and higher production speed, the pre-slitting sends the coiled material to the fine-cutting machine for fine-cutting, and the fine-cutting is performed in an on-line rotating moving-blade shearing manner to obtain the high-quality cut-edge aluminum foil.
Has the advantages that:
(1) according to the preparation method of the high-strength high-extensibility battery soft package aluminum-plastic film, provided by the invention, Sb element is added into alloy components, so that the hardness of the alloy is improved, the final alloy obtains excellent mechanical properties by controlling the mass ratio of Sb to Si to be 0.5-4, and a sample is characterized, and the low-silicon high-antimony alloy is adopted, so that the crystal grain structure is fine and uniform.
(2) The invention provides a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film, which adopts a control mode of timing and temperature setting in a finished product annealing process, and the specific process parameters are as follows: the temperature is increased to 180-280 ℃ from the initial temperature within 0-10 h, the heat is preserved for 8-12 h, after the heat preservation is finished, the temperature is increased to 285-350 ℃ within 0-10 h, the heat is preserved for 20-40 h, after the heat preservation is finished, the temperature is reduced to 350-285 ℃ within 0-5 h, the heat is preserved for 20-40 h, and after the heat preservation is finished, the temperature is reduced to the initial temperature within 0-10 h. The annealing process can obtain good annealing performance, the brushing grade reaches A +, the contact angle is less than 10 degrees, the surface wetting tension is more than or equal to 70dyne, and the annealed aluminum foil has the effects of no adhesion, no peculiar smell, no rising and the like.
(3) The invention improves the metal temperature by carrying out intermediate recrystallization annealing after rough rolling and rapidly increasing the furnace gas temperature by adopting a differential temperature ratio method, shortens the annealing time and improves the production efficiency.
(4) According to the preparation method of the high-strength and high-extensibility battery soft package aluminum-plastic film, the preheating program is set before hot rolling, so that the deformation degree of metal and the metal deformation energy consumption are reduced, the rolling efficiency is improved, and the rolling is optimized; meanwhile, the high finishing temperature can be kept, so that the final finished product has good mechanical properties.
(5) According to the preparation method of the high-strength and high-extensibility battery soft package aluminum-plastic film, in the shearing process, the shearing process is divided into pre-cutting and finish cutting, the pre-cutting divides a coil into two halves, the plate shape internal stress can be eliminated, the trimming quality and the high production speed are ensured, the coiled material is sent to a finish cutting machine for finish cutting after the pre-cutting, and the finish cutting is carried out in an on-line rotating movable cutter shearing mode, so that a high-quality trimming aluminum foil is obtained.
(6) The invention provides a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film, wherein in a foil rolling procedure, a foil rolled coil is subjected to three rolling processes of rough rolling, intermediate rolling and finish rolling; and after the intermediate rolling, and then finish rolling by using the aluminum foil to obtain the single-sided smooth aluminum foil with a uniform and fine surface, wherein the upper surface is a bright surface, and the lower surface is a dark surface, so that the oil can be removed, the pollution to the aluminum foil can be reduced, and the wettability of the surface of the aluminum foil can be improved.
Drawings
FIG. 1 is a graph of the grain size of the high-silicon low-antimony product 50 times the surface grain size in the example.
FIG. 2 is a graph of the surface grains of the high-silicon low-antimony article 200 times as large as those of the example.
FIG. 3 is a graph of the grain size of the low-silicon high-antimony product 50 times the surface grain size in the example.
FIG. 4 is a graph of the grain size of the low-silicon high-antimony product 200 times that of the example.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example 1:
a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film comprises the following steps:
s1, smelting:
the preparation method comprises the following steps of:
0.0212 percent of Si, 1.5 percent of Fe, 0.011 percent of Cu, 0.0056 percent of Mn, 0.0006 percent of Zn, 0.0036 percent of Ti, 0.004 percent of B, 0.063 percent of Sb, 0.0005 percent of Mg, and the balance of Al;
s2, casting: forming a cast ingot by a casting machine;
s3, sawing: sawing the cast ingot in the step S2, specifically, cutting off the head part of the cast ingot, namely the gate part by about 120mm, milling the upper and lower large surfaces of the cast ingot, wherein the milling amount is 13mm, and the side surface is not milled;
s4, homogenizing heat treatment: setting the annealing temperature at 500 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging;
s5, hot rolling: preheating before hot rolling, controlling the temperature of furnace gas at 500 ℃, keeping the temperature for 10 hours, and performing multi-pass rolling by using a hot rolling mill after preheating;
s6, cold rolling: rough rolling is carried out by adopting a working roll with the roughness Ra of 0.5 and the convexity of 0.02mm, cogging is carried out, a cold rolled coil with the thickness of 1.3mm is obtained for the first time after rolling, intermediate recrystallization annealing is carried out after trimming, nitrogen annealing is adopted for annealing, the temperature is controlled at 400 ℃, the heat preservation time is 1h, cooling is carried out to normal temperature after annealing, cold finish rolling is carried out, the production is carried out by adopting the working roll with the roughness Ra of 0.3 and the convexity of 0.06mm, and the cold finish rolling is finally carried out, so that a foil rolled coil with the thickness of 0.3mm is obtained;
s7, foil rolling: transferring the foil roll obtained in the step S6 into a foil rolling process, and carrying out aluminum foil rough rolling, medium rolling and finish rolling, wherein the roughness adopted by the rough rolling, the medium rolling and the finish rolling is 0.3, 0.2 and 0.05 respectively; rolling the rolled foil, performing intermediate rolling, then performing aluminum foil finish rolling to obtain a single-sided polished aluminum foil, wherein the thickness of the aluminum-plastic film foil finally obtained by foil rolling is 0.05 mm;
s8, splitting and cutting: after foil rolling, splitting and shearing are carried out through a splitting machine;
s9, annealing of finished products: heating to 280 ℃ from the initial temperature within 10h, keeping the temperature for 12h, continuing heating to 350 ℃ within 10h after the heat preservation is finished, keeping the temperature for 40h, cooling to 280 ℃ within 5h after the heat preservation is finished, keeping the temperature for 40h after the temperature is reduced, and cooling to the initial temperature within 10h after the heat preservation is finished. And finally obtaining a finished product.
Example 2:
a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film comprises the following steps:
s1, smelting: the preparation method comprises the following steps of:
0.0205% of Si, 1.54% of Fe, 0.007% of Cu, 0.005% of Mn, 0.0004% of Zn, 0.0053% of Ti, 0.003% of B, 0.003% of Sb, 0.00058% of Mg and the balance of Al;
s2, casting: forming a cast ingot by a casting machine;
s3, sawing: sawing the cast ingot in the step S2, specifically, cutting off the head part of the cast ingot, namely the gate part by about 120mm, milling the upper and lower large surfaces of the cast ingot, wherein the milling amount is 13mm, and the side surface is not milled;
s4, homogenizing heat treatment: setting the annealing temperature at 500 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging;
s5, hot rolling: preheating before hot rolling, controlling the temperature of furnace gas at 500 ℃, keeping the temperature for 10 hours, and performing multi-pass rolling by using a hot rolling mill after preheating;
s6, cold rolling: rough rolling is carried out by adopting a working roll with the roughness Ra of 0.5 and the convexity of 0.02mm, cogging is carried out, a cold rolled coil with the thickness of 1.3mm is obtained for the first time after rolling, intermediate recrystallization annealing is carried out after trimming, nitrogen annealing is adopted for annealing, the temperature is controlled at 400 ℃, the heat preservation time is 1h, cooling is carried out to normal temperature after annealing, cold finish rolling is carried out, the production is carried out by adopting the working roll with the roughness Ra of 0.3 and the convexity of 0.06mm, and the cold finish rolling is finally carried out, so that a foil rolled coil with the thickness of 0.3mm is obtained;
s7, foil rolling: transferring the foil roll obtained in the step S6 into a foil rolling process, and carrying out aluminum foil rough rolling, medium rolling and finish rolling, wherein the roughness adopted by the rough rolling, the medium rolling and the finish rolling is 0.3, 0.2 and 0.05 respectively; rolling the rolled foil, performing intermediate rolling, then performing aluminum foil finish rolling to obtain a single-sided polished aluminum foil, wherein the thickness of the aluminum-plastic film foil finally obtained by foil rolling is 0.05 mm;
s8, splitting and cutting: after foil rolling, splitting and shearing are carried out through a splitting machine;
s9, annealing of finished products: heating to 280 ℃ from the initial temperature within 10h, keeping the temperature for 12h, continuing heating to 350 ℃ within 10h after the heat preservation is finished, keeping the temperature for 40h, cooling to 280 ℃ within 5h after the heat preservation is finished, keeping the temperature for 40h after the temperature is reduced, and cooling to the initial temperature within 10h after the heat preservation is finished. And finally obtaining a finished product.
Example 3:
a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film comprises the following steps:
s1, smelting: the preparation method comprises the following steps of:
0.0623% of Si, 1.63% of Fe, 0.008% of Cu, 0.0035% of Mn, 0.0004% of Zn, 0.0053% of Ti, 0.002% of B, 0.06% of Sb, 0.00058% of Mg and the balance of Al;
s2, casting: forming a cast ingot by a casting machine;
s3, sawing: sawing the cast ingot in the step S2, specifically, cutting off the head part of the cast ingot, namely the gate part by about 120mm, milling the upper and lower large surfaces of the cast ingot, wherein the milling amount is 13mm, and the side surface is not milled;
s4, homogenizing heat treatment: setting the annealing temperature at 500 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging;
s5, hot rolling: preheating before hot rolling, controlling the temperature of furnace gas at 500 ℃, keeping the temperature for 10 hours, and performing multi-pass rolling by using a hot rolling mill after preheating;
s6, cold rolling: rough rolling is carried out by adopting a working roll with the roughness Ra of 0.5 and the convexity of 0.02mm, cogging is carried out, a cold rolled coil with the thickness of 1.3mm is obtained for the first time after rolling, intermediate recrystallization annealing is carried out after trimming, nitrogen annealing is adopted for annealing, the temperature is controlled at 400 ℃, the heat preservation time is 1h, cooling is carried out to normal temperature after annealing, cold finish rolling is carried out, the production is carried out by adopting the working roll with the roughness Ra of 0.3 and the convexity of 0.06mm, and the cold finish rolling is finally carried out, so that a foil rolled coil with the thickness of 0.3mm is obtained;
s7, foil rolling: transferring the foil roll obtained in the step S6 into a foil rolling process, and carrying out aluminum foil rough rolling, medium rolling and finish rolling, wherein the roughness adopted by the rough rolling, the medium rolling and the finish rolling is 0.3, 0.2 and 0.05 respectively; the foil rolling coil is rolled after middle rolling, aluminum foil finish rolling is carried out after the rolling coil, a single-sided smooth aluminum foil is obtained, and the thickness of the aluminum plastic film foil finally obtained through foil rolling is 0.05 mm;
s8, splitting and cutting: after foil rolling, coil splitting and shearing are carried out through a coil splitter;
s9, annealing of finished products: heating to 280 ℃ from the initial temperature within 10h, keeping the temperature for 12h, continuing heating to 350 ℃ within 10h after the heat preservation is finished, keeping the temperature for 40h, cooling to 280 ℃ within 5h after the heat preservation is finished, keeping the temperature for 40h after the temperature is reduced, and cooling to the initial temperature within 10h after the heat preservation is finished. And finally obtaining a finished product.
Example 4:
a preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film comprises the following steps:
s1, smelting: the materials are prepared according to the following mass percentage
0.0906% of Si, 1.39% of Fe, 0.006% of Cu, 0.002% of Mn, 0.0004% of Zn, 0.0053% of Ti, 0.001% of B, 0.053% of Sb, 0.00058% of Mg and the balance of Al;
s2, casting: forming a cast ingot by a casting machine;
s3, sawing: sawing the cast ingot in the step S2, namely cutting off the head part, namely the sprue part of the cast ingot by about 120mm, milling the upper and lower large surfaces of the cast ingot, wherein the milling amount is 13mm, and the side surface is not milled;
s4, homogenizing heat treatment: setting the annealing temperature at 500 ℃, keeping the temperature for 8 hours, and naturally cooling after discharging;
s5, hot rolling: preheating before hot rolling, controlling the temperature of furnace gas at 500 ℃, keeping the temperature for 10 hours, and performing multi-pass rolling by using a hot rolling mill after preheating;
s6, cold rolling: rough rolling is carried out by adopting a working roll with the roughness Ra of 0.5 and the convexity of 0.02mm, cogging is carried out, a cold rolled coil with the thickness of 1.3mm is obtained for the first time after rolling, intermediate recrystallization annealing is carried out after trimming, nitrogen annealing is adopted for annealing, the temperature is controlled at 400 ℃, the heat preservation time is 1h, cooling is carried out to normal temperature after annealing, cold finish rolling is carried out, the production is carried out by adopting the working roll with the roughness Ra of 0.3 and the convexity of 0.06mm, and the cold finish rolling is finally carried out, so that a foil rolled coil with the thickness of 0.3mm is obtained;
s7, foil rolling: transferring the foil roll obtained in the step S6 into a foil rolling process, and carrying out aluminum foil rough rolling, medium rolling and finish rolling, wherein the roughness adopted by the rough rolling, the medium rolling and the finish rolling is 0.3, 0.2 and 0.05 respectively; rolling the rolled foil, performing intermediate rolling, then performing aluminum foil finish rolling to obtain a single-sided polished aluminum foil, wherein the thickness of the aluminum-plastic film foil finally obtained by foil rolling is 0.05 mm;
s8, splitting and cutting: after foil rolling, splitting and shearing are carried out through a splitting machine;
s9, annealing of finished products: heating to 280 ℃ from the initial temperature within 10h, preserving heat for 12h, continuing heating to 350 ℃ within 10h after heat preservation is finished, preserving heat for 40h, cooling to 280 ℃ within 5h after heat preservation is finished, preserving heat for 40h, and cooling to the initial temperature within 10h after heat preservation is finished. And finally obtaining a finished product.
In the four examples, the alloy compositions of examples 1-2 are low-Si and high-Sb alloy compositions, and the alloy compositions of examples 3-4 are high-Si and low-Sb alloy compositions, and the mechanical properties of the samples prepared in the four examples are detected, and the detection results are shown in the following table:
according to the detection results, when the mass ratio of the low-silicon high-antimony components is adopted as the raw material components of the aluminum-plastic film, the aluminum-plastic film has more excellent mechanical properties compared with the high-silicon low-antimony components, such as yield strength, tensile strength and elongation; and simultaneously, the sample is characterized, the characterization results are shown in figures 1-4, and the comparison shows that the aluminum foil prepared by adopting low-silicon high-antimony has finer crystal grains and forms a compact and uniform tissue.
As a further improvement, the above-mentioned is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A preparation method of a high-strength and high-extensibility battery soft package aluminum-plastic film is characterized by comprising the following steps:
s1, smelting: feeding materials into a smelting furnace according to the components for smelting, wherein Si is 0.02-0.06%; sb is less than or equal to 0.07 percent, and the mass ratio of Sb to Si is 0.5-4;
s2, casting: forming a cast ingot by a casting machine;
s3, sawing: sawing the cast ingot in the step S2, specifically, cutting off the head part of the cast ingot, namely the gate part by about 120mm, milling the upper and lower large surfaces of the cast ingot, wherein the milling amount is 10-15 mm, and the side surface is not milled;
s4, homogenizing heat treatment: setting the annealing temperature to be 490-620 ℃, keeping the temperature for 5-13 h, and naturally cooling after discharging;
s5, hot rolling: preheating before hot rolling, controlling the temperature of furnace gas to be 480-520 ℃, keeping the temperature for 10-12 hours, and then performing multi-pass rolling by using a hot rolling mill;
s6, cold rolling: comprises a cold rough rolling procedure and a cold finish rolling procedure;
s7, foil rolling: transferring the aluminum foil after finish rolling into foil rolling process production, wherein the foil rolling is subjected to three rolling processes of rough rolling, intermediate rolling and finish rolling; after the intermediate rolling, carrying out coil combination, and then carrying out fine rolling on the aluminum foil;
s8, splitting and cutting: after foil rolling, splitting and shearing are carried out through a splitting machine;
and S9, annealing the finished product.
2. The preparation method of the high-strength high-ductility battery soft package aluminum-plastic film according to claim 1, wherein specific process parameters of annealing of the S9 finished product are as follows: the temperature is increased to 180-280 ℃ from the initial temperature within 0-10 h, the heat is preserved for 8-12 h, after the heat preservation is finished, the temperature is increased to 285-350 ℃ within 0-10 h, the heat is preserved for 20-40 h, after the heat preservation is finished, the temperature is reduced to 350-285 ℃ within 0-5 h, the heat is preserved for 20-40 h, and after the heat preservation is finished, the temperature is reduced to the initial temperature within 0-10 h.
3. The preparation method of the high-strength high-ductility battery soft package aluminum-plastic film according to claim 1, wherein the cold rough rolling in S6 specifically comprises the following steps: and cogging, carrying out multi-pass rolling, carrying out intermediate recrystallization annealing after trimming, setting the temperature to be 300-450 ℃, keeping the temperature for about 1-2 hours, setting the total annealing time to be 10-15 hours, setting the roughness Ra to be 0.4-0.7 mu m, and setting the convexity of a working roll to be 0.02 mm.
4. The preparation method of the high-strength high-ductility battery soft package aluminum-plastic film according to claim 1, wherein the cold finish rolling in S6 specifically comprises the following steps: and cooling the aluminum coil subjected to the cold rough rolling to the normal temperature for finish rolling, wherein the roughness Ra is 0.2-0.4 mu m, and the convexity of the working roll is 0.06 mm.
5. The method for preparing the high-strength and high-ductility soft package aluminum plastic film for the battery according to claim 1, wherein the roughness of the working roll in the S7 is 0.2 to 0.3 μm during rough rolling, the roughness of the working roll in the S7 is 0.1 to 0.2 μm during medium rolling, and the roughness of the working roll in the S7 is 0.05 to 0.09 μm during finish rolling.
6. The method for preparing the high-strength high-ductility battery soft package aluminum-plastic film according to claim 1, wherein the mass percentages of the remaining components in S1 are Fe 1.3-1.7%, Cu less than or equal to 0.05%, Mn less than or equal to 0.03%, Zn less than or equal to 0.05%, Ti less than or equal to 0.02%, B less than or equal to 0.005%, Mg less than or equal to 0.0006%, and the balance being Al.
7. The method for preparing the high-strength high-ductility battery soft package aluminum-plastic film as claimed in claim 1, wherein the cutting process in S8 includes pre-slitting and fine slitting.
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| CN116005018A (en) * | 2022-12-13 | 2023-04-25 | 江苏鼎胜新能源材料股份有限公司 | Low-cost high-brightness aluminum foil for milk powder sealing cover and preparation method thereof |
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