CN112893464A - Processing method of aluminum foil for power battery - Google Patents
Processing method of aluminum foil for power battery Download PDFInfo
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- CN112893464A CN112893464A CN202110044841.2A CN202110044841A CN112893464A CN 112893464 A CN112893464 A CN 112893464A CN 202110044841 A CN202110044841 A CN 202110044841A CN 112893464 A CN112893464 A CN 112893464A
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- 239000011888 foil Substances 0.000 title claims abstract description 112
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 95
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 238000003672 processing method Methods 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 119
- 238000000137 annealing Methods 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 47
- 238000005520 cutting process Methods 0.000 claims abstract description 30
- 238000005097 cold rolling Methods 0.000 claims abstract description 29
- 238000005266 casting Methods 0.000 claims abstract description 22
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 19
- 238000004806 packaging method and process Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims description 30
- 238000004140 cleaning Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 21
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 16
- 239000003921 oil Substances 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 14
- 238000010008 shearing Methods 0.000 claims description 13
- 239000010731 rolling oil Substances 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 238000011068 loading method Methods 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 7
- 238000002834 transmittance Methods 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000002199 base oil Substances 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract description 4
- 238000009966 trimming Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 54
- 230000007547 defect Effects 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 239000002893 slag Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000009736 wetting Methods 0.000 description 5
- 238000010408 sweeping Methods 0.000 description 4
- 240000002853 Nelumbo nucifera Species 0.000 description 3
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 3
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
- B21B45/0203—Cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/001—Aluminium or its alloys
-
- 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
- B21B2015/0021—Cutting or shearing the product in the rolling direction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geometry (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a processing method of an aluminum foil for a power battery, which comprises the following steps: smelting, casting and rolling, cold rolling, annealing, cold rolling, trimming, foil rolling, cutting of finished products and packaging. The invention properly improves the Cu content to 0.04-0.05% by adjusting the proportion of alloy components, improves the performance of the finished aluminum foil for the power battery, performs intermediate low-temperature annealing when the blank is rolled to about 0.7mm, the annealing temperature is 180-200 ℃, the heat preservation time is 14-16 h, the aluminum foil is discharged after being cooled for 2h, improves the subsequent workability of the material, adjusts the intermediate annealing thickness, adopts low-temperature intermediate annealing to facilitate subsequent rolling, improves the tensile strength of the aluminum foil for the power battery, and is cooled for 24h after the foil is rolled to an intermediate pass, releases the stress of the material, reduces the surface adhesion of the material, and solves the problems of rib forming and poor model in continuous rolling.
Description
Technical Field
The invention relates to the technical field of aluminum foil processing, in particular to a processing method of an aluminum foil for a power battery.
Background
With the rapid development of new energy automobiles, as a core part of the new energy automobiles, the demand of the power battery is huge, and the quality of the power battery directly influences the development of enterprises. The anode electronic current collector of the power battery is an aluminum foil material. Along with the increase of the mileage requirement of new energy automobiles, the energy ratio of the power battery is higher and higher, and the aluminum foil for the power battery is used as an important material of the power battery, so that the required tensile strength is higher, and the thickness is thinner. 1235, 1060 and 1070 alloy aluminum foils are commonly used in the industry at present, and the common thickness is 0.012-0.02 mm. The main production process of the aluminum foil for the existing 1060 alloy power battery comprises the following steps: the thickness of a cast-rolled blank is 7.0mm, the cast-rolled blank is cold rolled to be 1.0-2.5 mm, then high-temperature annealing is carried out, when the cast-rolled blank is cold rolled to be 0.24mm of the thickness of a base material, the edge cutting is carried out, the foil rolling is carried out, the tensile strength of a finished product is 170-190 Mpa, the rolling force of the finished product is small because the material is soft, the oil quantity on the surface of an aluminum foil is large, the surface wetting tension can only reach about 31, and the problems of scrapping or battery performance reduction caused by insufficient strength and poor surface adhesion force during subsequent carbon coating production are caused.
Therefore, the processing method of the aluminum foil for the power battery is provided, the tensile strength of the aluminum foil can be improved under the condition that the thickness of the aluminum foil is reduced, the phenomenon of wrinkling and coating leakage during carbon coating compaction is avoided, the surface wetting tension of the aluminum foil for the power battery can be improved, the phenomenon of coating leakage easily occurring during downstream carbon coating production is avoided, and the influence on the performance of the battery is reduced.
Disclosure of Invention
The invention mainly aims to provide a processing method of an aluminum foil for a power battery, which can effectively solve the problem that wrinkling and coating leakage are easy to occur in the downstream production of carbon coating under the conditions that the thickness of the aluminum foil for the power battery is continuously reduced and the surface wetting tension of the aluminum foil for the power battery is low in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a processing method of an aluminum foil for a power battery comprises the following steps: smelting, casting and rolling, cold rolling, annealing, cold rolling, trimming, foil rolling, finished product slitting and packaging, wherein the processing method of the aluminum foil for the power battery comprises the following steps:
the method comprises the following steps: smelting: during smelting, the components of the alloy are adjusted, the Cu component is increased to 0.04-0.05% so as to improve the performance of a finished product, the temperature of a smelting guide furnace is controlled within the range of 745 +/-5 ℃, the components are uniform, and the component percentage of the alloy is as follows: si: 0.06% -0.09%; fe: 0.10 to 0.15 percent; cu: 0.04 to 0.05 percent; mn: 0.01 percent; mg: 0.01 percent; cr: 0.01 percent; zn: 0.01 percent; ti: 0.02% -0.03%; more than or equal to 99.60 percent of Al, the balance being impurity content, the upper limit and the lower limit of the content being alloy elements, and when the content is a single numerical value, other impurities have the highest value. Degassing, removing slag, stirring thoroughly and uniformly, and controlling the hydrogen content below 0.12ml/100g & Al;
step two: casting and rolling: during casting and rolling production, online degassing is performed by adopting a rotary blowing method, 30PPi +50PPi double-stage filtration is adopted for filtration, an imported Al-5 Ti-0.2B titanium wire is adopted as an alterant, the addition of the alterant is strictly controlled, a low rolling speed is selected during production, metallurgical defects such as hydrogen content, slag inclusion, loose tissue and the like in a cast and rolled blank are effectively eliminated and controlled, a proper casting and rolling area and a mouth roller gap are adopted to ensure good casting and rolling surface quality and internal grain tissue, and the thickness of a cast and rolled finished product is controlled to be 7.0 +/-0.1 mm;
step three: cold rolling: during cold rolling production, the surface of each roller in the guide path is cleaned by blowing and sweeping, no residual oil stain exists, when the blank is rolled to the thickness of 0.65-0.75 mm by four passes, low-temperature intermediate annealing is carried out, and after annealing and cooling, the blank is rolled to the thickness of 0.24mm by 2 passes and then edge cutting is carried out;
step four: longitudinally shearing edges: cleaning each guide roller in the guide way during longitudinal edge shearing, and cleaning each guide roller by using alcohol or acetone to ensure that the surface of the aluminum coil cannot be marked, adhered with aluminum, scratched or scratched, burrs, turriforms, lotus leaf edges, small broken waves at the edges and the like cannot appear on the end surface, and the middle edge shearing staggered layer is less than 2 mm;
step five: annealing: sealing the non-detachable layer by using a high-temperature-resistant aluminum foil adhesive tape during annealing, and then loading the material rack for furnace loading and annealing; and (3) intermediate annealing process: when the thickness is 0.65-0.75 mm, keeping the temperature for 14-16 hours at the temperature of 180-200 ℃, cooling for 2 hours, discharging the annealed material from the furnace, and feeding the annealed material to a rolling mill for production when the annealed material is completely cooled;
step six: foil rolling: when the base material with the thickness of 0.24mm is rolled by foil rolling, the slower rolling speed and the smaller tension are ensured, and the defects of marking, sticking, large thickness difference fluctuation and the like on the surface of an aluminum plate during rolling are prevented; rolling is carried out after 3 passes of rolling, after foil rough rolling is finished, the foil is cooled for 24 hours and then rolled, and the defects of surface ribbing, sticking and the like during subsequent rolling are reduced; replacing the working roll during the pass rolling of the finished product, cleaning each roll in the guide way, replacing the supporting roll when the surface of the supporting roll is not accordant, adjusting a blowing tuyere of the rolling mill when the finished product is discharged, and ensuring that the surface of the aluminum foil has no continuous oil spots;
step seven: and (4) cutting a finished product: when cutting, cleaning each guide roller in the guide path, and cleaning each guide roller by alcohol or acetone; ensuring that the surface of the aluminum coil cannot be marked, adhered with aluminum, scratched or scratched, performing first-time cutting of materials discharged from a rolling mill for production, and performing cutting after the rolling mill discharges finished products and starts to cut, wherein the interval between the two steps cannot be more than 30 min;
step eight: and (3) inspection and packaging: when a finished product is inspected, the thickness and the width of the aluminum foil are mainly inspected to be not beyond the tolerance range, burrs and turned edges cannot exist on the end face, the end face is damaged by collision, the staggered layer cannot exceed 0.5mm, the specification and the material of the sleeve meet the requirements, the two sides of the sleeve extend out of the end face of the aluminum foil by 5mm respectively, and the aluminum foil is packaged according to the packaging requirements of the battery foil after the aluminum foil is inspected to be qualified.
Further, in the sixth step, the finished rolling oil additive is 80# base oil, 2-3% of high-performance additive with model number of 625W3 is added, wherein the ester content is 95%, and the other 5%, the light transmittance of the rolling oil is detected before the finished rolling, the light transmittance is not less than 97% for production, online dynamic oil bottles are observed during rolling, the oil quality is found to be dark, and the machine is stopped immediately for paper replacement.
Further, in the sixth step, when the finished product is rolled, the working roll has the roughness Ra0.08 μm.
And further, in the seventh step, after the finished product is rolled and discharged, a splitting machine is mounted on the finished product for splitting within 20min, and the material discharged from the rolling mill has residual temperature, so that rolling oil attached to the surface of the finished product can be volatilized, and the surface wettability is improved.
Further, in the third step, the casting rolling coil with the thickness of 7.0mm is rolled into a cold rolling coil with the thickness of 0.24mm during cold rolling.
Further, in the sixth step, the 0.24mm cold-rolled coil is rolled to a finished coil through foil after intermediate annealing.
Further, in the rolling process of each cold rolling pass of the thick cold-rolled coil, the intermediate annealing process is that the temperature of annealing furnace gas is raised to 190 ℃ after 2 hours, the temperature is kept for 15 hours, and then the thick cold-rolled coil is cooled for 2 hours and discharged.
Compared with the prior art, the invention has the following beneficial effects:
1. by adjusting the proportion of alloy components, properly improving the Cu content to 0.04-0.05%, and improving the performance of the aluminum foil finished product for the power battery;
2. intermediate low-temperature annealing is carried out when the blank is rolled to about 0.7mm, the annealing temperature is 180-200 ℃, the heat preservation time is 14-16 h, the blank is discharged after being cooled for 2h, the subsequent workability of the material is improved, the intermediate annealing thickness is adjusted, the low-temperature intermediate annealing is adopted, the subsequent rolling is facilitated, and the tensile strength of the aluminum foil for the power battery is improved;
3. cooling for 24 hours from foil rolling to intermediate pass, releasing material stress, reducing material surface adhesion damage, and causing problems of rib formation and poor plate type in continuous rolling;
4. the roughness Ra0.08 mu m is used by the working roll when the finished product is rolled, so that the surface quality of the finished product is improved, and the rolling oil attached to the surface of the finished product is reduced;
5. after the finished product is rolled and discharged, a splitting machine is mounted on the machine within 20min for splitting, and the material discharged from the rolling mill has residual temperature, so that rolling oil attached to the surface of the finished product can be volatilized, and the surface wettability is improved;
6. the finished aluminum foil product for the power battery, which is prepared by the invention, has high tensile strength, is more than 215Mpa, has surface wetting tension more than or equal to 34 dyne value, and reduces the defects of crushing and coating leakage when the downstream process is used for carbon coating production.
Detailed Description
The present invention is further described with reference to specific embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work are within the scope of the present invention.
Example 1
A processing method of an aluminum foil for a power battery comprises the following steps: smelting, casting and rolling, cold rolling, annealing, cold rolling, trimming, foil rolling, finished product slitting and packaging, wherein the processing method of the aluminum foil for the power battery comprises the following steps:
the method comprises the following steps: smelting: during smelting, the components of the alloy are adjusted, the Cu component is increased to 0.04-0.05% so as to improve the performance of a finished product, the temperature of a smelting guide furnace is controlled within the range of 745 +/-5 ℃, the components are uniform, and the component percentage of the alloy is as follows: si: 0.06% -0.09%; fe: 0.10 to 0.15 percent; cu: 0.04 to 0.05 percent; mn: 0.01 percent; mg: 0.01 percent; cr: 0.01 percent; zn: 0.01 percent; ti: 0.02% -0.03%; more than or equal to 99.60 percent of Al, the balance being impurity content, the upper limit and the lower limit of the content being alloy elements, and when the content is a single numerical value, other impurities have the highest value. Degassing, removing slag, stirring thoroughly and uniformly, and controlling the hydrogen content below 0.12ml/100g & Al;
by adjusting the proportion of alloy components, the Cu content is properly increased to 0.04-0.05%, and the performance of the aluminum foil finished product for the power battery is improved.
Step two: casting and rolling: during casting and rolling production, a rotary blowing method is adopted for online degassing, 30PPi +50PPi double-stage filtration is adopted for filtration, an imported Al-5 Ti-0.2B titanium wire is adopted as an alterant, the addition of the alterant is strictly controlled, a low rolling speed is selected during production to effectively eliminate and control metallurgical defects such as hydrogen content, slag inclusion, loose structure and the like in a cast-rolling blank, a proper casting and rolling area and a suitable nozzle roller gap are adopted to ensure good casting and rolling surface quality and internal grain structure, and the thickness of a cast-rolling finished product is controlled to be 7.0 +/-0.1 mm.
Step three: cold rolling: during cold rolling production, the surface of each roller in the guide path is cleaned by blowing and sweeping, no residual oil stain exists, when the blank is rolled to the thickness of 0.65-0.75 mm by four times, low-temperature intermediate annealing is carried out, and after annealing and cooling, the blank is rolled to the thickness of 0.24mm by 2 times and then edge cutting is carried out.
Step four: longitudinally shearing edges: cleaning each guide roller in the guide way during longitudinal edge shearing, and cleaning each guide roller by using alcohol or acetone to ensure that the surface of the aluminum coil cannot be marked, adhered with aluminum, scratched or scratched, burrs, turriforms, lotus leaf edges, small broken waves at the edges and the like cannot appear on the end surface, and the middle edge shearing staggered layer is less than 2 mm.
Step five: annealing: sealing the non-detachable layer by using a high-temperature-resistant aluminum foil adhesive tape during annealing, and then loading the material rack for furnace loading and annealing; and (3) intermediate annealing process: when the thickness is 0.65-0.75 mm, keeping the temperature for 14-16 hours at the temperature of 180-200 ℃, cooling for 2 hours, discharging the annealed material from the furnace, and feeding the annealed material to a rolling mill for production when the annealed material is completely cooled;
the blank is rolled to about 0.7mm to carry out intermediate low-temperature annealing, the annealing temperature is 180-200 ℃, the heat preservation time is 14-16 h, the blank is discharged after being cooled for 2h, the subsequent workability of the material is improved, the intermediate annealing thickness is adjusted, the low-temperature intermediate annealing is adopted, the subsequent rolling is facilitated, and the tensile strength of the aluminum foil for the power battery is improved.
Step six: foil rolling: when the base material with the thickness of 0.24mm is rolled by foil rolling, the slower rolling speed and the smaller tension are ensured, and the defects of marking, sticking, large thickness difference fluctuation and the like on the surface of an aluminum plate during rolling are prevented; rolling is carried out after 3 passes of rolling, after foil rough rolling is finished, the foil is cooled for 24 hours and then rolled, and the defects of surface ribbing, sticking and the like during subsequent rolling are reduced; replacing the working roll during the pass rolling of the finished product, cleaning each roll in the guide way, replacing the supporting roll when the surface of the supporting roll is not accordant, adjusting a blowing tuyere of the rolling mill when the finished product is discharged, and ensuring that the surface of the aluminum foil has no continuous oil spots;
in the sixth step, the finished product rolling oil additive is 80# base oil, 2-3% of high-performance additive with model number of 625W3 is added, wherein the ester content is 95%, the other 5% of high-performance additive is produced by detecting the light transmittance of the rolling oil before rolling, the light transmittance is more than or equal to 97%, an online dynamic oil bottle is observed during rolling, the oil quality is darkened when the oil is observed, and the machine is stopped immediately for changing paper;
in the sixth step, after intermediate annealing, rolling the 0.24mm cold-rolled coil into a finished coil through foil rolling;
in the rolling process of each cold rolling pass of the thick cold-rolled coil, the intermediate annealing process is that the temperature of annealing furnace gas is raised to 190 ℃ after 2 hours, the temperature is kept for 15 hours, and then the thick cold-rolled coil is cooled for 2 hours and discharged;
step six, when rolling the finished product, using a working roll with the roughness Ra0.08 mu m;
step seven: and (4) cutting a finished product: when cutting, cleaning each guide roller in the guide path, and cleaning each guide roller by alcohol or acetone; ensuring that the surface of the aluminum coil cannot be marked, adhered with aluminum, scratched or scratched, performing first-time cutting of materials discharged from a rolling mill for production, and performing cutting after the rolling mill discharges finished products and starts to cut, wherein the interval between the two steps cannot be more than 30 min;
step eight: and (3) inspection and packaging: when a finished product is inspected, the thickness and the width of the aluminum foil are mainly inspected to be not beyond the tolerance range, burrs and turned edges cannot exist on the end face, the end face is damaged by collision, the staggered layer cannot exceed 0.5mm, the specification and the material of the sleeve meet the requirements, the two sides of the sleeve extend out of the end face of the aluminum foil by 5mm respectively, and the aluminum foil is packaged according to the packaging requirements of the battery foil after the aluminum foil is inspected to be qualified.
By adopting the technical scheme: cooling for 24 hours from foil rolling to intermediate pass, releasing material stress, reducing material surface adhesion damage, and causing problems of rib formation and poor layout in continuous rolling; the roughness Ra0.08 mu m of the working roll is used during the rolling of the finished product, so that the surface quality of the finished product is improved, and the rolling oil attached to the surface of the finished product is reduced.
Example 2
A processing method of an aluminum foil for a power battery is characterized by comprising the following steps: the method comprises the following steps:
step one, smelting: during smelting, the components of the alloy are adjusted, the Cu component is increased to 0.04-0.05%, and the hydrogen content is controlled to be below 0.12ml/100 g.Al;
step two, casting and rolling: performing online degassing by adopting a rotary blowing method, filtering by adopting 30PPi +50PPi two-stage filtration, wherein a modifier is Al-5 Ti-0.2B titanium wire, selecting a low rolling speed during production, and controlling the thickness of a cast-rolled finished product to be 7.0 +/-0.1 mm;
step three, cold rolling: during cold rolling production, when the blank is rolled to the thickness of 0.65-0.75 mm by four passes, low-temperature intermediate annealing is carried out, and after annealing and cooling, the blank is rolled to the thickness of 0.24mm by 2 passes and then edge cutting is carried out;
step four, longitudinally shearing edges: cleaning each guide roller in the guide way during longitudinal edge shearing, cleaning each guide roller by using alcohol or acetone, and cutting the middle edge and staggering the layer to be less than 2 mm;
step five, annealing: sealing the non-detachable layer by using a high-temperature-resistant aluminum foil adhesive tape during annealing, and then loading the material rack for furnace loading and annealing;
step six, foil rolling: when foil rolling is carried out on the base material with the thickness of 0.24mm, rolling is carried out for 3 passes, after foil rough rolling is completed, cooling is carried out for 24 hours, and then rolling is carried out; adjusting a blowing tuyere of the rolling mill when a finished product is obtained, wherein the surface of the aluminum foil has no continuous oil spots;
step seven, cutting a finished product: when cutting, cleaning each guide roller in the guide path, and cleaning each guide roller by alcohol or acetone; the material discharged from the rolling mill is cut at the first time for production, and the interval between the discharge of the finished product from the rolling mill and the start of cutting cannot be more than 30 min;
step eight, checking and packaging: when a finished product is inspected, the thickness and the width of the aluminum foil are mainly inspected to be not more than the tolerance range, the end face cannot be burred, flanged and damaged by collision, the staggered layer cannot be more than 0.5mm, the two sides of the sleeve extend out of the end face of the aluminum foil by 5mm respectively, and the aluminum foil is packaged according to the packaging requirements of the battery foil after the aluminum foil is inspected to be qualified.
Further, in step three, cold rolling: during cold rolling production, the surface of each roller in the guide path is cleaned by blowing and sweeping, no residual oil stain exists, when the blank is rolled to the thickness of 0.65-0.75 mm by four times, low-temperature intermediate annealing is carried out, and after annealing and cooling, the blank is rolled to the thickness of 0.24mm by 2 times and then edge cutting is carried out.
Further, in the third step, a 7.0mm thick cast-rolled coil is rolled into a 0.24mm cold-rolled coil during cold rolling.
Example 3
A processing method of an aluminum foil for a power battery comprises the following steps: smelting, casting and rolling, cold rolling, annealing, cold rolling, trimming, foil rolling, finished product slitting and packaging, wherein the processing method of the aluminum foil for the power battery comprises the following steps:
the method comprises the following steps: smelting: during smelting, the components of the alloy are adjusted, the Cu component is increased to 0.04-0.05% so as to improve the performance of a finished product, the temperature of a smelting guide furnace is controlled within the range of 745 +/-5 ℃, the components are uniform, and the component percentage of the alloy is as follows: si: 0.06% -0.09%; fe: 0.10 to 0.15 percent; cu: 0.04 to 0.05 percent; mn: 0.01 percent; mg: 0.01 percent; cr: 0.01 percent; zn: 0.01 percent; ti: 0.02% -0.03%; more than or equal to 99.60 percent of Al, the balance being impurity content, the upper limit and the lower limit of the content being alloy elements, and when the content is a single numerical value, other impurities have the highest value. Degassing, removing slag, stirring thoroughly and uniformly, and controlling the hydrogen content below 0.12ml/100g & Al;
by adjusting the proportion of alloy components, the Cu content is properly increased to 0.04-0.05%, and the performance of the aluminum foil finished product for the power battery is improved.
Step two: casting and rolling: during casting and rolling production, a rotary blowing method is adopted for online degassing, 30PPi +50PPi double-stage filtration is adopted for filtration, an imported Al-5 Ti-0.2B titanium wire is adopted as an alterant, the addition of the alterant is strictly controlled, a low rolling speed is selected during production to effectively eliminate and control metallurgical defects such as hydrogen content, slag inclusion, loose structure and the like in a cast-rolling blank, a proper casting and rolling area and a suitable nozzle roller gap are adopted to ensure good casting and rolling surface quality and internal grain structure, and the thickness of a cast-rolling finished product is controlled to be 7.0 +/-0.1 mm.
Step three: cold rolling: during cold rolling production, the surface of each roller in the guide path is cleaned by blowing and sweeping, no residual oil stain exists, when the blank is rolled to the thickness of 0.65-0.75 mm by four times, low-temperature intermediate annealing is carried out, and after annealing and cooling, the blank is rolled to the thickness of 0.24mm by 2 times and then edge cutting is carried out.
Step four: longitudinally shearing edges: cleaning each guide roller in the guide way during longitudinal edge shearing, and cleaning each guide roller by using alcohol or acetone to ensure that the surface of the aluminum coil cannot be marked, adhered with aluminum, scratched or scratched, burrs, turriforms, lotus leaf edges, small broken waves at the edges and the like cannot appear on the end surface, and the middle edge shearing staggered layer is less than 2 mm.
Step five: annealing: sealing the non-detachable layer by using a high-temperature-resistant aluminum foil adhesive tape during annealing, and then loading the material rack for furnace loading and annealing; and (3) intermediate annealing process: when the thickness is 0.65-0.75 mm, keeping the temperature for 14-16 hours at the temperature of 180-200 ℃, cooling for 2 hours, discharging the annealed material from the furnace, and feeding the annealed material to a rolling mill for production when the annealed material is completely cooled;
the blank is rolled to about 0.7mm to carry out intermediate low-temperature annealing, the annealing temperature is 180-200 ℃, the heat preservation time is 14-16 h, the blank is discharged after being cooled for 2h, the subsequent workability of the material is improved, the intermediate annealing thickness is adjusted, the low-temperature intermediate annealing is adopted, the subsequent rolling is facilitated, and the tensile strength of the aluminum foil for the power battery is improved.
Step six: foil rolling: when the base material with the thickness of 0.24mm is rolled by foil rolling, the slower rolling speed and the smaller tension are ensured, and the defects of marking, sticking, large thickness difference fluctuation and the like on the surface of an aluminum plate during rolling are prevented; rolling is carried out after 3 passes of rolling, after foil rough rolling is finished, the foil is cooled for 24 hours and then rolled, and the defects of surface ribbing, sticking and the like during subsequent rolling are reduced; replacing the working roll during the pass rolling of the finished product, cleaning each roll in the guide way, replacing the supporting roll when the surface of the supporting roll is not accordant, adjusting a blowing tuyere of the rolling mill when the finished product is discharged, and ensuring that the surface of the aluminum foil has no continuous oil spots;
step seven: and (4) cutting a finished product: when cutting, cleaning each guide roller in the guide path, and cleaning each guide roller by alcohol or acetone; ensuring that the surface of the aluminum coil cannot be marked, adhered with aluminum, scratched or scratched, performing first-time cutting of materials discharged from a rolling mill for production, and performing cutting after the rolling mill discharges finished products and starts to cut, wherein the interval between the two steps cannot be more than 30 min;
step seven, after the finished product is rolled and is discharged, a splitting machine is mounted for splitting within 20 min;
step eight: and (3) inspection and packaging: when a finished product is inspected, the thickness and the width of the aluminum foil are mainly inspected to be not beyond the tolerance range, burrs and turned edges cannot exist on the end face, the end face is damaged by collision, the staggered layer cannot exceed 0.5mm, the specification and the material of the sleeve meet the requirements, the two sides of the sleeve extend out of the end face of the aluminum foil by 5mm respectively, and the aluminum foil is packaged according to the packaging requirements of the battery foil after the aluminum foil is inspected to be qualified.
By adopting the technical scheme: after the finished product is rolled and discharged, the finished product is cut by a splitting machine within 20min, and the material discharged from the rolling mill has residual temperature, so that rolling oil attached to the surface of the finished product can be volatilized, and the surface wettability is improved.
Example 4
A processing method of an aluminum foil for a power battery comprises the following steps:
the method comprises the following steps: the alloy components of the adjusting and preparing are 0.13 percent of Fe, and the weight ratio of Si: 0.08%, Ti: 0.027%, Cu: 0.039 percent and less than or equal to 0.01 percent of other elements, and transferring the mixture to a casting and rolling process after a series of degassing and purifying treatments, wherein the casting temperature is 695 ℃, the casting and rolling speed is 680mm/min, and the slab thickness is 7.0 mm;
step two: the cold rolling process comprises the following process flows: 7.0-4.0-2.1-1.2-0.7-intermediate annealing-0.4-0.24-edge cutting;
step three: after 0.24 foil rolling, the foil rolling process flow is as follows: 0.24-0.14-0.07-0.036-cooling for 24 h-0.021-0.013-cutting and packaging the finished product;
step four: the intermediate annealing process comprises the following steps: and (4) raising the temperature of annealing furnace gas to 190 ℃ within 2h, preserving the heat for 15h, cooling for 2h, and discharging.
The aluminum foil for power batteries prepared in this example was subjected to a performance test, and the final product had the following properties: the tensile strength is 215-223 Mpa, the elongation is 2.8-3.2%, and the surface wetting tension is 34 dyne value.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A processing method of an aluminum foil for a power battery is characterized by comprising the following steps: the method comprises the following steps:
step one, smelting: during smelting, the components of the alloy are adjusted, the Cu component is increased to 0.04-0.05%, and the hydrogen content is controlled to be below 0.12ml/100 g.Al;
step two, casting and rolling: performing online degassing by adopting a rotary blowing method, filtering by adopting 30PPi +50PPi two-stage filtration, wherein a modifier is Al-5 Ti-0.2B titanium wire, selecting a low rolling speed during production, and controlling the thickness of a cast-rolled finished product to be 7.0 +/-0.1 mm;
step three, cold rolling: during cold rolling production, when the blank is rolled to the thickness of 0.65-0.75 mm by four passes, low-temperature intermediate annealing is carried out, and after annealing and cooling, the blank is rolled to the thickness of 0.24mm by 2 passes and then edge cutting is carried out;
step four, longitudinally shearing edges: cleaning each guide roller in the guide way during longitudinal edge shearing, cleaning each guide roller by using alcohol or acetone, and cutting the middle edge and staggering the layer to be less than 2 mm;
step five, annealing: sealing the non-detachable layer by using a high-temperature-resistant aluminum foil adhesive tape during annealing, and then loading the material rack for furnace loading and annealing;
step six, foil rolling: when foil rolling is carried out on the base material with the thickness of 0.24mm, rolling is carried out for 3 passes, after foil rough rolling is completed, cooling is carried out for 24 hours, and then rolling is carried out; adjusting a blowing tuyere of the rolling mill when a finished product is obtained, wherein the surface of the aluminum foil has no continuous oil spots;
step seven, cutting a finished product: when cutting, cleaning each guide roller in the guide path, and cleaning each guide roller by alcohol or acetone; the material discharged from the rolling mill is cut at the first time for production, and the interval between the discharge of the finished product from the rolling mill and the start of cutting cannot be more than 30 min;
step eight, checking and packaging: when a finished product is inspected, the thickness and the width of the aluminum foil are mainly inspected to be not more than the tolerance range, the end face cannot be burred, flanged and damaged by collision, the staggered layer cannot be more than 0.5mm, the two sides of the sleeve extend out of the end face of the aluminum foil by 5mm respectively, and the aluminum foil is packaged according to the packaging requirements of the battery foil after the aluminum foil is inspected to be qualified.
2. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: in the first step, the temperature of the smelting guide furnace is controlled within the range of 745 +/-5 ℃, degassing and deslagging are required to be carried out, stirring is carried out fully and uniformly, and the temperature of the smelting guide furnace is controlled within the range of 745 +/-5 ℃.
3. The processing method of the aluminum foil for the power battery according to claim 2, characterized in that: the alloy has uniform components and comprises the following components in percentage by weight: si: 0.06% -0.09%; fe: 0.10 to 0.15 percent; cu: 0.04 to 0.05 percent; mn: 0.01 percent; mg: 0.01 percent; cr: 0.01 percent; zn: 0.01 percent; ti: 0.02% -0.03%; more than or equal to 99.60 percent of Al, the balance being impurity content, the upper limit and the lower limit of the content being alloy elements, and when the content is a single numerical value, other impurities have the highest value.
4. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: in the fifth step: and (3) intermediate annealing process: when the thickness is 0.65-0.75 mm, keeping the temperature for 14-16 hours at 180-200 ℃, cooling for 2 hours, discharging the annealed material from the furnace, and feeding the annealed material onto a rolling mill for production when the annealed material is completely cooled.
5. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: in the sixth step, the finished product rolling oil additive is 80# base oil, 2-3% of high-performance additive with model number of 625W3 is added, wherein the ester content is 95%, the other 5%, the light transmittance of the rolling oil is detected before rolling the finished product, and the light transmittance is more than or equal to 97% for production.
6. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: in the sixth step, when the finished product is rolled, the working roll has the roughness Ra0.08 mu m.
7. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: and seventhly, after the finished product is rolled and is discharged, a splitting machine is mounted for splitting within 20 min.
8. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: in the third step, the casting-rolling coil with the thickness of 7.0mm is rolled into a cold-rolling coil with the thickness of 0.24mm during cold rolling.
9. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: in the sixth step, the 0.24mm cold-rolled coil is rolled to a finished coil through foil after intermediate annealing.
10. The processing method of the aluminum foil for the power battery according to claim 1, characterized in that: in the rolling process of each cold rolling pass of the thick cold-rolled coil, the intermediate annealing process is that the temperature of annealing furnace gas is raised to 190 ℃ after 2 hours, the temperature is kept for 15 hours, and then the thick cold-rolled coil is cooled for 2 hours and discharged.
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