CN115896500A - Aluminum foil for battery and preparation method thereof - Google Patents
Aluminum foil for battery and preparation method thereof Download PDFInfo
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- CN115896500A CN115896500A CN202211625256.2A CN202211625256A CN115896500A CN 115896500 A CN115896500 A CN 115896500A CN 202211625256 A CN202211625256 A CN 202211625256A CN 115896500 A CN115896500 A CN 115896500A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 156
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 239000011888 foil Substances 0.000 title claims abstract description 133
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims description 66
- 238000007670 refining Methods 0.000 claims description 44
- 238000003723 Smelting Methods 0.000 claims description 43
- 238000003825 pressing Methods 0.000 claims description 43
- 239000002994 raw material Substances 0.000 claims description 38
- 238000005097 cold rolling Methods 0.000 claims description 33
- 238000005266 casting Methods 0.000 claims description 30
- 238000001914 filtration Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000956 alloy Substances 0.000 abstract description 8
- 229910045601 alloy Inorganic materials 0.000 abstract description 7
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 18
- 229910001416 lithium ion Inorganic materials 0.000 description 18
- 239000000155 melt Substances 0.000 description 14
- 229910052802 copper Inorganic materials 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to an aluminum foil for a battery and a preparation method thereof. By adjusting the alloy components and the heat treatment process, the tensile strength of the aluminum foil for the primary battery is improved from 145MPa to 170-185MPa from the original tensile strength of 1060 and 1070 aluminum alloys, the aluminum foil for the primary battery has moderate strength, the elongation is improved from the original 2.5% to the existing 3.0%, the tensile strength and the elongation both reach the first-class level, and the band breakage rate of the aluminum foil in the battery coating process is greatly reduced, so that the aims of improving the efficiency and stabilizing the quality are fulfilled. The obtained aluminum foil has wide application prospect in the field of batteries.
Description
Technical Field
The invention relates to the field of aluminum foil materials, in particular to an aluminum foil for a battery and a preparation method thereof.
Background
The aluminum foil is mainly prepared from 1060 or 1070 aluminum alloy as a raw material in the preparation process, the material is simply smelted and cast-rolled to obtain a proper cast blank plate, and other alloys are not added in the casting process to strengthen the material, so that the material is generally low in strength, large in structure crystal grains, low in elongation and poor in comprehensive mechanical property. Conventionally produced 1060 or 1070 aluminum foils are often difficult to stabilize at tensile strengths in excess of 145MPa, often resulting in the alloy foil breaking due to insufficient strength.
If a higher-strength aluminum alloy such as 1100 or 3003 alloy is used, the tensile strength of the alloy reaches over 240MPa, but because the strength of the material is high, the offset deformation resistance is large in the rolling process, so that the large rolling force is forced to be used for production in the rolling process, the rolling roll shape is disordered in the rolling process, the shape of the foil is abnormal, local edge tightening and strip breaking are caused, and the strip breaking rate of the alloy cannot be reduced. How to develop an aluminum foil preparation technology with good mechanical properties and low strip breakage rate in the preparation process is a technical hotspot and difficulty in the current industry.
Disclosure of Invention
In view of the problems in the prior art, one aspect of the present invention provides a method for preparing an aluminum foil for a battery, the method having a low tape breakage rate during preparation and excellent aluminum foil properties, and the method comprising:
preparing an aluminum foil by smelting, casting and rolling, cold rolling and foil binding processes of an aluminum foil raw material;
the cold rolling procedure is a seven-pass cold rolling procedure;
the aluminum foil raw material comprises the following components in percentage by weight:
Fe:0.3-0.5％；
Si:0.1-0.2％；
Cu:≤0.05％；
Mn:≤0.05％；
Mg:≤0.05％；
Zn:≤0.1％；
Ti:0.02-0.03％；
more than or equal to 99.35 percent of Al, and the balance of inevitable impurities.
The preparation method of the aluminum foil for the battery can reduce the generation rate of pinholes on the basis of ensuring the comprehensive performance of the product by optimizing the formula of raw materials:
according to the preparation method of the aluminum foil for the battery provided by the invention, preferably, the aluminum foil raw material comprises the following components in percentage by weight: 0.48 percent of Fe; 0.12 percent of Si; cu is less than or equal to 0.05 percent; mn is less than or equal to 0.05 percent; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.02 percent of Ti; more than or equal to 99.35 percent of Al, and the balance of inevitable impurities.
According to the preparation method of the aluminum foil for the battery provided by the invention, preferably, the aluminum foil raw material comprises the following components in percentage by weight: 0.5 percent of Fe; 0.18 percent of Si; cu is less than or equal to 0.05 percent; mn is less than or equal to 0.05 percent; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.03 percent of Ti; more than or equal to 99.35 percent of Al, and the balance of inevitable impurities.
According to the preparation method of the aluminum foil for the battery provided by the invention, preferably, the aluminum foil raw material comprises the following components in percentage by weight: 0.42 percent of Fe; 0.12 percent of Si; cu is less than or equal to 0.05 percent; mn is less than or equal to 0.05 percent; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.025 percent of Ti; more than or equal to 99.35 percent of Al, and the balance of inevitable impurities.
According to the preparation method of the aluminum foil for the battery provided by the invention, preferably, the smelting process comprises the steps of refining each aluminum foil raw material at the refining temperature of 720-750 ℃, and standing for 1-3 hours after the refining is finished to obtain an aluminum melt.
According to the method for preparing the aluminum foil for the battery, the raw material of the aluminum foil preferably comprises an electrolytic aluminum melt.
According to the method for preparing the aluminum foil for the battery provided by the invention, the mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is preferably 0.3-0.6: 1, refining for 15-25 minutes, and refining once every 2 hours.
According to the method for preparing the aluminum foil for the battery provided by the invention, preferably, the step of casting and rolling comprises the following steps: degassing and filtering the aluminum melt obtained in the smelting step, and casting and rolling to obtain a blank with the thickness of 6.8-7.2 mm.
According to the preparation method of the aluminum foil for the battery provided by the invention, preferably, the filtering treatment is double-layer plate type filtering in a filtering box, and the specifications of the filtering plates are 50ppi and 60ppi; the temperature of the filter box is controlled between 705 ℃ and 725 ℃.
According to the preparation method of the aluminum foil for the battery provided by the invention, the temperature of the box before the casting and rolling process is preferably controlled to be 690-698 ℃.
According to the preparation method of the aluminum foil for the battery, provided by the invention, the cold rolling procedure is preferably seven-pass cold rolling, and comprises the steps of pressing the blank from the initial thickness of the blank to 68% -72% of the initial thickness in a first pass, from 69% -73% of the initial thickness to 52% -55% of the initial thickness in a second pass, from 62% -55% of the initial thickness to 23% -27% of the initial thickness in a third pass, from 22% -27% of the initial thickness to 14% -17% of the initial thickness in a fourth pass, from 14% -17% of the initial thickness to 7% -10% of the initial thickness in a fifth pass, from 7% -10% of the initial thickness to 4% -6% of the initial thickness in a sixth pass, and from 4% -6% of the initial thickness to 2% -4% of the initial thickness in a seventh pass to obtain the cold-rolled aluminum foil.
According to the preparation method of the aluminum foil for the battery, provided by the invention, the cold rolling procedure is preferably seven-pass cold rolling, and comprises the steps of pressing the blank from 7.0mm to 5.0mm in the first pass, from 5.0mm to 3.8mm in the second pass, from 3.8mm to 1.8mm in the third pass, from 1.8mm to 1.1mm in the fourth pass, from 1.1mm to 0.6mm in the fifth pass, from 0.6mm to 0.35mm in the sixth pass and from 0.35mm to 0.22mm in the seventh pass, so as to obtain the cold-rolled aluminum foil.
Researches find that the seven-pass rolling can realize better aluminum foil performance and low strip breakage rate, and more or fewer passes can bring adverse effects on the product performance and the strip breakage rate.
According to the preparation method of the aluminum foil for the battery, provided by the invention, preferably, the heat treatment is carried out during the second pass, the temperature of furnace gas is controlled to be 550-560 ℃, the temperature of the furnace gas is adjusted to be 535 ℃ when the temperature of the material reaches 530-540 ℃, the temperature is kept for 3-5 hours at the temperature, and the material is discharged after being cooled for 2 hours along with the furnace; cooling for 12 hours or more after the fourth pass.
According to the method for preparing the aluminum foil for the battery provided by the invention, preferably, the foil rolling process comprises the step of rolling the cold-rolled aluminum foil into the aluminum foil with the thickness of 0.009-0.02 mm.
According to the preparation method of the aluminum foil for the battery provided by the invention, the thickness of the cold-rolled aluminum foil is preferably 0.22mm.
According to the method for preparing the aluminum foil for the battery provided by the invention, preferably, when the aluminum foil with the thickness of 0.009-0.01 mm is prepared in the foil rolling process, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.009-0.01 mm.
According to the preparation method of the aluminum foil for the battery provided by the invention, preferably, when the aluminum foil with the thickness of 0.011-0.015 mm is prepared in the foil rolling procedure, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, the fourth pass is pressed from 0.030mm to 0.018mm, and the fifth pass is pressed from 0.018mm to 0.011-0.015 mm.
According to the method for preparing the aluminum foil for the battery provided by the invention, preferably, when the aluminum foil with the thickness of 0.016-0.02 is prepared in the foil rolling process, the following steps are allocated: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.030mm, and the fourth pass is from 0.030mm to 0.016-0.02 mm.
Another aspect of the present invention provides an aluminum foil for a battery, which is prepared by the above-described preparation method.
Compared with the prior art, the invention has the following beneficial effects:
the invention adjusts the alloy components and the heat treatment process, the tensile strength of the aluminum foil for the primary battery is improved from 145MPa to 170-185MPa from the original tensile strength of 1060 and 1070 aluminum alloys, the strength is moderate, the elongation is improved from the original 2.5 percent to the existing 3.0 percent, the tensile strength and the elongation both reach the first-class level, the band breakage rate of the aluminum foil in the battery coating process is greatly reduced, and the purposes of improving the efficiency and stabilizing the quality are achieved.
The invention adopts the liquid-solid ratio of (0.2-0.6): 1, keeps the solid-liquid ratio reasonable, ensures the foil strength, reduces the impurity content of the original structure and reduces the production of foil pinholes, and the purity of the original aluminum reaches more than 99.90 percent.
The invention adopts a novel heat treatment process and high-temperature annealing, improves the internal structure of the aluminum alloy material, optimizes the mechanical property and ensures that the aluminum foil has stronger machinability in the subsequent production process.
The invention optimizes the pass distribution, effectively improves the mechanical property of the material, optimizes the shape of the plate and improves the production efficiency of the product.
Drawings
Fig. 1 is a photograph of an aluminum foil prepared in example 1.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Throughout the present invention, unless otherwise specified, the contents of the respective components are all weight percentages, and the ratios of the respective components are all weight percentages.
The following examples and comparative examples were tested for performance using the national standard GB/T228-2010 and were analyzed by tensile testing, the data of which are shown in Table 1.
Example 1:
the aluminum foil for the lithium ion battery provided by the embodiment is prepared from the following raw materials in percentage by mass: 0.42 percent of Fe; s i:0.1%; 0.02 percent of Cu; 0.05 percent of Mn; 0.05 percent of Mg; 0.02 percent of Zn; 0.023 percent of Ti; 99.35 percent of Al and the balance of inevitable impurity content.
The preparation method of the aluminum foil for the lithium ion battery provided by the embodiment comprises the steps of smelting, casting and rolling, cold rolling and foil rolling, wherein the cold rolling pass distribution is as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to be 550 ℃, when the temperature of materials reaches 530 ℃, the temperature of the furnace gas is adjusted to be 535 ℃, heat preservation is carried out for 3 hours at the temperature, and the materials are discharged after being cooled for 2 hours along with the furnace; cooling for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula amount, wherein the aluminum is electrolytic aluminum melt, refining is carried out at the refining temperature of 720 ℃, and standing for 1 hour after the refining is finished to obtain the melt.
The mass ratio of the solid raw materials to the electrolytic aluminum melt during smelting is 0.3:1, refining time is 15 minutes, and refining is carried out every 2 hours.
The specific method of casting and rolling comprises the following steps: degassing and filtering the melt obtained in the smelting step to obtain 6.8mm of blank.
Adopting double-layer plate type filtration, wherein the specifications of the filter plates are 50ppi and 60ppi; the filter box temperature was controlled at 705 ℃.
The temperature of the box before the casting and rolling process is controlled at 690 ℃.
The specific method for rolling the aluminum foil comprises the following steps: the aluminum foil for the lithium ion Chi Bo of 0.009mm is produced by rolling after cold rolling.
When the aluminum foil with the thickness of 0.009mm is produced, the pass distribution is as follows: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.032mm, the fourth pass is from 0.032mm to 0.019mm, the fifth pass is from 0.019mm to 0.013mm, and the sixth pass is from 0.013mm to 0.009mm.
Example 2:
the aluminum foil for the lithium ion battery provided by the embodiment is prepared from the following raw materials in percentage by mass: 0.47 percent of Fe; 0.2 percent of Si; 0.04 percent of Cu; 0.04 percent of Mn; 0.04 percent of Mg; 0.01 percent of Zn; 0.03 percent of Ti; 99.35 percent of Al and the balance of inevitable impurity content.
The preparation method of the aluminum foil for the lithium ion battery provided by the embodiment comprises the steps of smelting, casting and rolling, cold rolling and foil rolling, wherein the cold rolling pass distribution is as follows: pressing from 7.0mm to 5.0mm in the first pass, pressing from 5.0mm to 3.8mm in the second pass, pressing from 3.8mm to 1.8mm in the third pass, pressing from 1.8mm to 1.1mm in the fourth pass, pressing from 1.1mm to 0.6mm in the fifth pass, pressing from 0.6mm to 0.35mm in the sixth pass, pressing from 0.35mm to 0.22mm in the seventh pass, performing heat treatment in the second pass, controlling the furnace gas temperature to be 560 ℃, adjusting the furnace gas temperature to be 535 ℃ when the material temperature reaches 540 ℃, preserving heat for 5 hours at the temperature, cooling with the furnace for 2 hours, and discharging; cooling 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula amount, wherein the aluminum is an electrolytic aluminum melt, refining is carried out at the refining temperature of 750 ℃, and standing for 3 hours after the refining is finished to obtain the melt.
The mass ratio of the solid raw materials to the electrolytic aluminum melt during smelting is 0.6: refining time was 25 minutes, and refining was performed every 2 hours.
The specific method of casting and rolling comprises the following steps: degassing and filtering the melt obtained in the smelting step to obtain a 7.2mm blank.
Adopting double-layer plate type filtration, wherein the specifications of the filter plates are 50ppi and 60ppi; the temperature of the filter box was controlled at 725 ℃.
The temperature of the box before the casting and rolling process is controlled at 698 ℃.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, 0.02mm of aluminum foil for lithium ion Chi Bo is produced by rolling.
When the aluminum foil with the thickness of 0.02mm is produced, the pass distribution is as follows: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.030mm, and the fourth pass is from 0.030mm to 0.02mm.
Example 3:
the aluminum foil for the lithium ion battery provided by the embodiment is prepared from the following raw materials in percentage by mass: 0.41 percent of Fe; 0.12 percent of Si; 0.04 percent of Cu; 0.05 percent of Mn; 0.05 percent of Mg; 0.02 percent of Zn; 0.025 percent of Ti; 99.35 percent of Al and the balance of inevitable impurity content.
The preparation method of the aluminum foil for the lithium ion battery comprises the steps of smelting, casting rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: the first pass is pressed from 7.0mm to 5.0mm, the second pass is pressed from 5.0mm to 3.8mm, the third pass is pressed from 3.8mm to 1.8mm, the fourth pass is pressed from 1.8mm to 1.1mm, the fifth pass is pressed from 1.1mm to 0.6mm, the sixth pass is pressed from 0.6mm to 0.35mm, the seventh pass is pressed from 0.35mm to 0.22mm, heat treatment is carried out in the second pass, the temperature of furnace gas is controlled to 555 ℃, when the temperature of materials reaches 535 ℃, the temperature of the furnace gas is adjusted to 535 ℃, heat preservation is carried out for 4 hours at the temperature, and the materials are discharged after being cooled for 2 hours along with the furnace; cooling for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula amount, wherein the aluminum is an electrolytic aluminum melt, refining is carried out at the refining temperature of 730 ℃, and standing for 2 hours after the refining is finished to obtain the melt.
The mass ratio of the solid raw materials to the electrolytic aluminum melt during smelting is 0.5: refining time was 20 minutes, and refining was performed every 2 hours.
The specific method of casting and rolling comprises the following steps: degassing and filtering the melt obtained in the smelting step to obtain a 7mm blank.
Adopting double-layer plate type filtration, wherein the specifications of filter plates are 50ppi and 60ppi; the temperature of the filter box was controlled at 720 ℃.
The temperature of the box before the casting and rolling process is controlled to be 695 ℃.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, 0.012mm of aluminum foil for lithium ion Chi Bo is produced by rolling.
When the aluminum foil with the thickness of 0.012mm is produced, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, the fourth pass is pressed from 0.031mm to 0.017mm, and the fifth pass is pressed from 0.017mm to 0.012mm.
Example 4:
the aluminum foil for the lithium ion battery provided by the embodiment is prepared from the following raw materials in percentage by mass: 0.48 percent of Fe; 0.12 percent of Si; 0.04 percent of Cu; 0.05 percent of Mn; 0.05 percent of Mg; 0.02 percent of Zn; 0.02 percent of Ti; 99.35 percent of Al and the balance of inevitable impurity content.
The preparation method of the aluminum foil for the lithium ion battery provided by the embodiment comprises the steps of smelting, casting and rolling, cold rolling and foil rolling, wherein the cold rolling pass distribution is as follows: pressing from 7.0mm to 5.0mm in the first pass, pressing from 5.0mm to 3.8mm in the second pass, pressing from 3.8mm to 1.8mm in the third pass, pressing from 1.8mm to 1.1mm in the fourth pass, pressing from 1.1mm to 0.6mm in the fifth pass, pressing from 0.6mm to 0.35mm in the sixth pass, pressing from 0.35mm to 0.22mm in the seventh pass, performing heat treatment in the second pass, controlling the furnace gas temperature to be 560 ℃, adjusting the furnace gas temperature to be 535 ℃ when the material temperature reaches 530 ℃, preserving heat for 3 hours at the temperature, cooling with the furnace for 2 hours, and discharging; cooling for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula amount, wherein the aluminum is an electrolytic aluminum melt, refining is carried out at the refining temperature of 750 ℃, and standing for 1 hour after the refining is finished to obtain the melt.
The mass ratio of the solid raw materials to the electrolytic aluminum melt during smelting is 0.6: refining time was 25 minutes, and refining was performed every 2 hours.
The specific method of casting and rolling comprises the following steps: degassing and filtering the melt obtained in the smelting step to obtain 6.8mm of blank.
Adopting double-layer plate type filtration, wherein the specifications of the filter plates are 50ppi and 60ppi; the temperature of the filter box was controlled at 725 ℃.
The temperature of the box before the casting and rolling process is controlled at 690 ℃.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, 0.01mm of aluminum foil for lithium ion Chi Bo is produced by rolling.
When the aluminum foil with the thickness of 0.01mm is produced, the pass distribution is as follows: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.032mm, the fourth pass is from 0.032mm to 0.019mm, the fifth pass is from 0.019mm to 0.013mm, and the sixth pass is from 0.013mm to 0.01mm.
Example 5:
the aluminum foil for the lithium ion battery provided by the embodiment is prepared from the following raw materials in percentage by mass: 0.5 percent of Fe; 0.18 percent of Si; 0.04 percent of Cu; 0.05 percent of Mn; 0.05 percent of Mg; 0.02 percent of Zn; 0.025 percent of Ti; 99.35 percent of Al and the balance of inevitable impurity content.
The preparation method of the aluminum foil for the lithium ion battery provided by the embodiment comprises the steps of smelting, casting and rolling, cold rolling and foil rolling, wherein the cold rolling pass distribution is as follows: pressing from 7.0mm to 5.0mm in the first pass, pressing from 5.0mm to 3.8mm in the second pass, pressing from 3.8mm to 1.8mm in the third pass, pressing from 1.8mm to 1.1mm in the fourth pass, pressing from 1.1mm to 0.6mm in the fifth pass, pressing from 0.6mm to 0.35mm in the sixth pass, pressing from 0.35mm to 0.22mm in the seventh pass, performing heat treatment in the second pass, controlling the furnace gas temperature to 555 ℃, adjusting the furnace gas temperature to 535 ℃ when the material temperature reaches 535 ℃, preserving heat for 4 hours at the temperature, cooling for 2 hours along with the furnace, and discharging; cooling 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula amount, wherein the aluminum is an electrolytic aluminum melt, refining is carried out at the refining temperature of 730 ℃, and standing for 2 hours after the refining is finished to obtain the melt.
The mass ratio of the solid raw materials to the electrolytic aluminum melt during smelting is 0.4: refining time was 20 minutes, and refining was performed every 2 hours.
The specific method of casting and rolling comprises the following steps: and degassing and filtering the melt obtained in the smelting step to obtain a 7mm blank.
Adopting double-layer plate type filtration, wherein the specifications of the filter plates are 50ppi and 60ppi; the temperature of the filter box was controlled at 720 ℃.
The box temperature before the casting and rolling process is controlled at 695 ℃.
The specific method for rolling the aluminum foil comprises the following steps: after cold rolling, 0.012mm of aluminum foil for lithium ion Chi Bo is produced by rolling.
When the aluminum foil with the thickness of 0.012mm is produced, the pass distribution is as follows: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.032mm, the fourth pass is from 0.031mm to 0.017mm, and the fifth pass is from 0.017mm to 0.012mm.
Comparative example 1:
the aluminum foil for the ion battery is prepared from the following raw materials in percentage by mass: 0.42 percent of Fe; s i:0.1%; 0.11 percent of Cu; 0.05 percent of Mn; 0.05 percent of Mg; 0.02 percent of Zn; 0.01 percent of Ti; 99.35 percent of Al and the balance of inevitable impurity content.
The preparation method of the aluminum foil for the ion battery comprises the steps of smelting, casting and rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: pressing from 7.0mm to 4.0mm in the first pass, pressing from 4.0mm to 1.8mm in the second pass, pressing from 1.8mm to 1.1mm in the third pass, pressing from 1.1mm to 0.7mm in the fourth pass, pressing from 0.7mm to 0.4mm in the fifth pass, pressing from 0.4mm to 0.22mm in the sixth pass, performing heat treatment in the second pass, controlling the furnace gas temperature to be 550 ℃, adjusting the furnace gas temperature to be 535 ℃ when the material temperature reaches 530 ℃, preserving heat at the temperature for 3 hours, cooling with the furnace for 2 hours, and then discharging; cooling for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula amount, wherein the aluminum is electrolytic aluminum melt, refining is carried out at the temperature of 720 ℃, and standing for 1 hour is carried out after the refining is finished, so as to obtain the melt.
The mass ratio of the solid raw materials to the electrolytic aluminum melt during smelting is 0.3:1, refining time is 15 minutes, and refining is carried out every 2 hours.
The specific method of casting and rolling comprises the following steps: degassing and filtering the melt obtained in the smelting step to obtain 6.8mm of blank.
Adopting double-layer plate type filtration, wherein the specifications of the filter plates are 50ppi and 60ppi; the filter box temperature was controlled at 705 ℃.
The temperature of the box before the casting and rolling process is controlled at 690 ℃.
The specific method for rolling the aluminum foil comprises the following steps: the aluminum foil for 0.009mm lithium ion Chi Bo is produced by rolling after cold rolling.
When the aluminum foil with the thickness of 0.009mm is produced, the pass distribution is as follows: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.032mm, the fourth pass is from 0.032mm to 0.019mm, the fifth pass is from 0.019mm to 0.013mm, and the sixth pass is from 0.013mm to 0.009mm.
Comparative example 2
The aluminum foil for the lithium ion battery provided by the embodiment is prepared from the following raw materials in percentage by mass: 0.42 percent of Fe; s i:0.1%; 0.11 percent of Cu; 0.05 percent of Mn; 0.05 percent of Mg; 0.02 percent of Zn; 0.01 percent of Ti; 99.35 percent of Al and the balance of inevitable impurity content.
The preparation method of the aluminum foil for the ion battery comprises the steps of smelting, casting and rolling, cold rolling and foil rolling, wherein the cold rolling passes are distributed as follows: pressing from 7.0mm to 5.0mm in the first pass, pressing from 5.0mm to 3.8mm in the second pass, pressing from 3.8mm to 1.8mm in the third pass, pressing from 1.8mm to 1.1mm in the fourth pass, pressing from 1.1mm to 0.6mm in the fifth pass, pressing from 0.6mm to 0.35mm in the sixth pass, pressing from 0.35mm to 0.22mm in the seventh pass, performing heat treatment in the third pass, controlling the furnace gas temperature to be 550 ℃, adjusting the furnace gas temperature to 535 ℃ when the material temperature reaches 530 ℃, preserving heat for 3 hours at the temperature, cooling for 2 hours along with the furnace, and discharging; cooling for 12 hours after the end of the fourth pass.
The smelting method comprises the following steps: smelting the raw materials according to the formula amount, wherein the aluminum is electrolytic aluminum melt, refining is carried out at the refining temperature of 720 ℃, and standing for 1 hour after the refining is finished to obtain the melt.
The mass ratio of the solid raw materials to the electrolytic aluminum melt during smelting is 0.9:1, refining time is 15 minutes, and refining is carried out every 2 hours.
The specific method of casting and rolling comprises the following steps: degassing and filtering the melt obtained in the smelting step to obtain 6.8mm of blank.
Adopting double-layer plate type filtration, wherein the specifications of the filter plates are 50ppi and 60ppi; the filter box temperature was controlled at 705 ℃.
The temperature of the box before the casting and rolling process is controlled at 690 ℃.
The specific method for rolling the aluminum foil comprises the following steps: the aluminum foil for the lithium ion Chi Bo of 0.009mm is produced by rolling after cold rolling.
When the aluminum foil with the thickness of 0.009mm is produced, the pass distribution is as follows: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.032mm, the fourth pass is from 0.032mm to 0.019mm, the fifth pass is from 0.019mm to 0.013mm, and the sixth pass is from 0.013mm to 0.009mm.
TABLE 1 test data for examples and comparative examples
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A preparation method of an aluminum foil for a battery is characterized by comprising the following steps:
preparing an aluminum foil by smelting, casting and rolling, cold rolling and foil binding processes of an aluminum foil raw material;
the cold rolling procedure is seven-pass cold rolling;
the aluminum foil raw material comprises the following components in percentage by weight:
Fe:0.3-0.5％；
Si:0.1-0.2％；
Cu:≤0.05％；
Mn:≤0.05％；
Mg:≤0.05％；
Zn:≤0.1％；
Ti:0.02-0.03％；
more than or equal to 99.35 percent of Al, and the balance of inevitable impurities.
2. The method for preparing an aluminum foil for batteries according to claim 1, wherein:
the aluminum foil raw material comprises the following components in percentage by weight: 0.48 percent of Fe; 0.12 percent of Si; cu is less than or equal to 0.05 percent; mn is less than or equal to 0.05 percent; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.02 percent of Ti; more than or equal to 99.35 percent of Al, and the balance of inevitable impurities;
or, the aluminum foil raw material comprises the following components in percentage by weight: 0.5 percent of Fe; 0.18 percent of Si; cu is less than or equal to 0.05 percent; mn is less than or equal to 0.05 percent; mg is less than or equal to 0.05 percent; zn is less than or equal to 0.02 percent; 0.03 percent of Ti; more than or equal to 99.35 percent of Al, and the balance of inevitable impurities.
3. The method for preparing an aluminum foil for batteries according to claim 1, wherein: the smelting process comprises the steps of refining each aluminum foil raw material at the refining temperature of 720-750 ℃, and standing for 1-3 hours after the refining is finished to obtain an aluminum melt.
4. The method of manufacturing an aluminum foil for batteries according to claim 3, wherein: the aluminum foil raw material comprises an electrolytic aluminum melt, and the mass ratio of the solid raw material to the electrolytic aluminum melt during smelting is 0.3-0.6: 1, refining for 15-25 minutes, and refining once every 2 hours.
5. The method of manufacturing an aluminum foil for a battery according to claim 3, characterized in that: the casting and rolling step comprises the following steps: degassing and filtering the aluminum melt obtained in the smelting step, and casting and rolling to obtain a blank with the thickness of 6.8-7.2 mm.
6. The method of manufacturing an aluminum foil for a battery according to claim 5, characterized in that: the filtration treatment is double-layer plate filtration in a filter box, and the specifications of filter plates are 50ppi and 60ppi; the temperature of the filter box is controlled to be 705-725 ℃, and the temperature of the box before the casting and rolling process is controlled to be 690-698 ℃.
7. The method for preparing an aluminum foil for a battery according to claim 1, wherein: the cold rolling procedure is seven-pass cold rolling, and comprises the steps of pressing the blank from the initial thickness of the blank to 68% -72% of the initial thickness in a first pass, pressing from 69% -73% of the initial thickness to 52% -55% of the initial thickness in a second pass, pressing from 62% -55% of the initial thickness to 23% -27% of the initial thickness in a third pass, pressing from 22% -27% of the initial thickness to 14% -17% of the initial thickness in a fourth pass, pressing from 14% -17% of the initial thickness to 7% -10% of the initial thickness in a fifth pass, pressing from 7% -10% of the initial thickness to 4% -6% of the initial thickness in a sixth pass, and pressing from 4% -6% of the initial thickness to 2% -4% of the initial thickness in a seventh pass to obtain the cold-rolled aluminum foil.
8. The method of manufacturing an aluminum foil for a battery according to claim 7, characterized in that: performing heat treatment in the second pass, controlling the temperature of furnace gas to be 550-560 ℃, adjusting the temperature of the furnace gas to be 535 ℃ when the temperature of the material reaches 530-540 ℃, preserving the heat for 3-5 hours at the temperature, cooling for 2 hours along with the furnace, and discharging; and cooling for more than 12 hours after the fourth pass is finished.
9. The method for preparing an aluminum foil for batteries according to claim 8, wherein: the foil rolling process comprises the steps of rolling the cold-rolled aluminum foil into an aluminum foil with the thickness of 0.009-0.02 mm;
when the foil rolling process is used for preparing an aluminum foil with the thickness of 0.009-0.01 mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.032mm, the fourth pass is pressed from 0.032mm to 0.019mm, the fifth pass is pressed from 0.019mm to 0.013mm, and the sixth pass is pressed from 0.013mm to 0.009-0.01 mm;
when the foil rolling process is used for preparing an aluminum foil with the thickness of 0.011-0.015 mm, the pass distribution is as follows: the first pass is pressed from 0.22mm to 0.11mm, the second pass is pressed from 0.11mm to 0.055mm, the third pass is pressed from 0.055mm to 0.030mm, the fourth pass is pressed from 0.030mm to 0.018mm, and the fifth pass is pressed from 0.018mm to 0.011-0.015 mm;
when the foil rolling process is used for preparing an aluminum foil with the thickness of 0.016-0.02, the pass distribution is as follows: the first pass is from 0.22mm to 0.11mm, the second pass is from 0.11mm to 0.055mm, the third pass is from 0.055mm to 0.030mm, and the fourth pass is from 0.030mm to 0.016-0.02 mm.
10. An aluminum foil for batteries, characterized in that it is produced by the production method as recited in any one of claims 1 to 9.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11217656A (en) * | 1998-01-29 | 1999-08-10 | Furukawa Electric Co Ltd:The | Production of aluminum alloy foil excellent in foil rollability |
| JP2003239052A (en) * | 2002-02-15 | 2003-08-27 | Nippon Light Metal Co Ltd | Method for producing aluminum foil base material and method for producing aluminum foil |
| CN107217175A (en) * | 2017-05-08 | 2017-09-29 | 永杰新材料股份有限公司 | A kind of battery high-performance aluminium foil and its production method |
| CN110863162A (en) * | 2019-12-10 | 2020-03-06 | 山东德利铝业科技有限公司 | Aluminum foil for high-performance 1100 alloy lithium ion battery and preparation method thereof |
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2022
- 2022-12-16 CN CN202211625256.2A patent/CN115896500A/en active Pending
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|---|---|---|---|---|
| JPH11217656A (en) * | 1998-01-29 | 1999-08-10 | Furukawa Electric Co Ltd:The | Production of aluminum alloy foil excellent in foil rollability |
| JP2003239052A (en) * | 2002-02-15 | 2003-08-27 | Nippon Light Metal Co Ltd | Method for producing aluminum foil base material and method for producing aluminum foil |
| CN107217175A (en) * | 2017-05-08 | 2017-09-29 | 永杰新材料股份有限公司 | A kind of battery high-performance aluminium foil and its production method |
| CN110863162A (en) * | 2019-12-10 | 2020-03-06 | 山东德利铝业科技有限公司 | Aluminum foil for high-performance 1100 alloy lithium ion battery and preparation method thereof |
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