High-strength and high-elongation 1060 aluminum alloy battery foil blank and production method thereof

Abstract

The invention belongs to the technical field of production of 1060 aluminum alloy battery foils, and relates to a high-strength and high-elongation 1060 aluminum alloy battery foil blank and a production method thereof, and the high-strength and high-elongation 1060 aluminum alloy battery foil blank comprises the following components in percentage by mass: less than or equal to 0.07% of S , 0.15-0.20% of Fe, 0.03-0.05% of Cu, less than or equal to 0.01% of Mn, less than or equal to 0.01% of Mg, less than or equal to 0.02% of Zn, 0.03-0.05% of Zr, less than or equal to 0.02% of T and more than or equal to 99.60% of A < l >. The high-strength and high-elongation 1060 aluminum alloy battery foil blank disclosed by the invention has the characteristics of high tensile strength and high elongation.

Description

Technical Field

[0001] The present invention belongs to the technical field of the production of 1060 aluminum alloy battery foils, and relates to a high-strength and high-elongation 1060 aluminum alloy battery foil blank and a production method thereof. Background Art

[0002] With the rapid development of the new energy industry, as a key material for the current collector of lithium-ion batteries, battery aluminum foil has increasingly stringent requirements for its conductivity, mechanical properties and surface quality. For existing 1xxx series aluminum alloys, it is difficult to meet the requirements of high tensile strength and high elongation by adjusting the contents of elements such as silicon, iron, and copper within the national standard range. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems, and provide a high-strength and high-elongation 1060 aluminum alloy battery foil blank and a production method thereof.

[0004] To achieve the above purpose, the present invention provides a high-strength and high-elongation 1060 aluminum alloy battery foil blank, characterized by including the following components and mass percentages: Si≤0.07%, Fe 0.15 - 0.20%, Cu 0.03 - 0.05%, Mn≤0.01%, Mg≤0.01%, Zn≤0.02%, Zr 0.03 - 0.05%, Ti≤0.02%, Al≥99.60%.

[0005] The present invention also provides a production method of a high-strength and high-elongation 1060 aluminum alloy battery foil blank, including:

[0006] (1) Melting: Melting raw materials containing Si, Fe, Cu, Mn, Mg, Zn, Ti and Al, and adding AIZr5 alloy ingots according to the ratio when the melting temperature is 730 - 760°C, so that the content of Zr is 0.03 - 0.05%;

[0007] (2) Cast rolling: Cast rolling the melted material into an aluminum coil, and the finished thickness is 6.0 - 6.5 mm;

[0008] (3) Cold rolling: Subjecting the finished aluminum coil to multiple cold rolling passes and then performing intermediate annealing, and after annealing and cooling, performing multiple rolling passes again to form a blank finished product with a thickness of 0.2 - 0.25 mm;

[0009] (4) Finished product trimming and cleaning: Trimming and cleaning the blank finished product.

[0010] Further, in step (3), after cold rolling to a thickness of 1.8 - 2.3 mm in multiple passes, intermediate annealing is carried out. The annealing process is to heat up to 480 - 550 °C at a rate of 2.0 °C / min - 5.0 °C / min, hold for 700 - 900 min, cool in the furnace, and then roll the blank into a finished product with a thickness of 0.2 - 0.25 mm in multiple passes.

[0011] Further, in step (4), trimming and cleaning are carried out using a stretcher leveller. The production speed is controlled at 60 - 80 m / min, the water temperature is ≥80 °C, and the pH value is 8 - 10.

[0012] The high-strength and high-elongation 1060 aluminum alloy battery foil blank and its production method of the present invention have the following beneficial effects: By increasing the mass percentage of zirconium element in the aluminum alloy of the battery foil blank, adjusting the cold rolling process, annealing temperature, and finished product cleaning, the thickness of the battery foil blank product is 0.2 - 0.25 mm, the tensile strength is ≥180 mpa, the elongation is ≧4%, the end face of the finished product is neat, without burrs, warping edges, or wavy edges, and the surface has no defects such as roll marks, oil spots, or oil lines, meeting the product requirements of high tensile strength, high elongation, and low pinholes for the battery foil blank. Specific embodiments

[0013] The present invention provides a high-strength and high-elongation 1060 aluminum alloy battery foil blank and its production method. Among them, the high-strength and high-elongation 1060 aluminum alloy battery foil blank includes the following components and mass percentages: Si ≤ 0.07%, Fe 0.15 - 0.20%, Cu 0.03 - 0.05%, Mn ≤ 0.01%, Mg ≤ 0.01%, Zn ≤ 0.02%, Zr 0.03 - 0.05%, Ti ≤ 0.02%, Al ≥ 99.60%.

[0014] The present invention also provides a production method for the high-strength and high-elongation 1060 aluminum alloy battery foil blank, specifically including:

[0015] (1) Melting: Melting raw materials containing Si, Fe, Cu0, M, Mg, Zn, Ti, and Al, and adding AIZr5 alloy ingots according to the ratio when the melting temperature is 730 - 760 °C to make the content of Zr 0.03 - 0.05%;

[0016] (2) Cast rolling: Cast rolling the melted material into an aluminum coil with a finished thickness of 6.0 - 6.5 mm. Among them, in step (2), the cast rolling filter box uses a double-stage filtration of plate type plus tube type. The first-stage filter plate is ≧50 mesh, the second-stage filter plate is ≧60 mesh, and the tube type uses a 7-tube tube to filter melt impurities. The thickness of the aluminum coil is controlled at 6.0 - 6.5 mm;

[0017] (3) Cold rolling: The finished aluminum coil is subjected to intermediate annealing after multiple cold rollings, and then after annealing and cooling, it is further rolled multiple times to form a finished product of blank material with a thickness of 0.2 - 0.25 mm. Specifically, in step (3), during cold rolling, after rolling to a thickness of 1.8 - 2.3 mm in multiple passes, intermediate annealing is carried out. The annealing process is to heat up to 480 - 550 °C at a rate of 2.0 °C / min - 5.0 °C / min, hold for 700 - 900 min, and after cooling in the furnace, it is further rolled in multiple passes to form a finished product of blank material with a thickness of 0.2 - 0.25 mm.

[0018] (4) Finished product trimming and cleaning: The blank material of the finished product is trimmed and cleaned. The trimming and cleaning are carried out using a tension leveling machine, with the production speed controlled at 60 - 80 m / min, the water temperature ≥ 80 °C, and the pH value 8 - 10.

[0019] The following uses specific embodiments to elaborate in detail on the high-strength and high-elongation 1060 aluminum alloy battery foil of the present invention and its production method:

[0020] Example 1

[0021] First, control the composition and mass percentage of the battery foil blank material as follows: Si 0.03%, Fe 0.17%, Cu 0.04%, Mn 0.01%, Mg 0.01%, Zn 0.01%, Zr 0.03%, Ti 0.02%, Al 99.60%.

[0022] According to the above composition control, further obtain the battery foil blank material, and its specific preparation steps are as follows:

[0023] (1) Melting: During melting, the raw materials are fully stirred evenly, the melting temperature is 730 - 750 °C, add AIZr5 alloy ingots according to the ratio (ensuring the content of Zr), stand for 30 min, refine three times at 740 °C for 30 min each time in the melting furnace using a special granular refining agent, and after the composition adjustment meets the control requirements of the present invention, pour the furnace, and the pouring temperature is 745 °C;

[0024] (2) Cast rolling: During cast rolling production, the degassing box temperature is controlled at 730 °C, the gas flow rate is controlled at 10 L / min, the rotor speed is controlled at 380 revolutions / min, the filtration box temperature is controlled at 715 °C, use a 50 + 60 - mesh plate + 7 - tube tube - type filter plate for three - stage filtration, the fore - box temperature is 690 °C, the cast - rolling zone is controlled at 58 mm, the casting nozzle opening is controlled at 5.5 mm, the cast - rolling linear speed is controlled at 860 mm / min, and the thickness of the cast - rolled aluminum coil finished product is 6.3 mm;

[0025] (3) Cold rolling: The cast-rolled aluminum coil is rolled (process flow arrangement: aluminum coil thickness 6.3mm - 3.5mm - 2.0mm - annealing - 0.85mm - 0.4mm - 0.22mm). The thickness measurement mass flow is turned on throughout the process. Annealing is carried out at a thickness of 2.0mm. The annealing process heats up to 560°C at a rate of 2.0°C / min to 5.0°C / min and holds for 840 minutes, then cools after being taken out of the furnace, and is secondarily rolled to the finished thickness of 0.22mm;

[0026] (4) Trimming and cleaning: Produced using a tension leveling machine, the production speed is controlled at 80m / min, the water temperature is 90°C, the pH value is 9, and the trimming amount is 20mm * 2.

[0027] For the performance test of the finished product of the battery foil blank of the present invention above, the test method adopts "GB / T228.1 - 2021". The test results show that the tensile strength is 183mpa, the elongation is 4.2%, the end face of the finished product is neat, without burrs, warping edges or wavy edges, and there are no defects such as roll marks, oil spots, and oil lines on the surface.

[0028] Example 2

[0029] First, control its composition and mass percentage as follows: Si 0.04%, Fe 0.18%, Cu 0.045%, Mn 0.01%, Mg 0.01%, Zn 0.01%, Zr 0.05%, Ti 0.02%, Al 99.60%.

[0030] According to the above composition control, further obtain the battery foil blank, and its specific preparation steps are as follows:

[0031] (1) Melting: During melting, the raw materials are fully stirred evenly. The melting temperature is 730 - 750°C. Add AIZr5 alloy ingots according to the ratio, and let it stand for 30 minutes. Refine three times at 740°C for 30 minutes each time using a special granular refining agent in the melting furnace. After the composition adjustment meets the control requirements of the present invention, pour the furnace, and the pouring temperature is 745°C;

[0032] (2) Cast rolling: During cast rolling production, the degassing box temperature is controlled at 730°C, the gas flow rate is controlled at 10L / min, the rotor speed is controlled at 380 revolutions / min, the filtration box temperature is controlled at 715°C, and a 50 + 60 - mesh plate + 7 - tube tubular filter plate is used for three - stage filtration. The front box temperature is 690°C, the cast rolling zone is controlled at 58mm, the nozzle opening is controlled at 5.5mm, the cast rolling line speed is controlled at 860mm / min, and the thickness of the cast - rolled aluminum coil finished product is 6.3mm;

[0033] (3) Cold rolling: The continuously cast and rolled aluminum coil is rolled (process flow arrangement: 6.3 - 3.3 - 1.8 - annealing - 0.8 - 0.4 - 0.22 mm). The thickness measurement mass flow is turned on throughout the process. Annealing is carried out at a thickness of 1.8 mm. The annealing process heats up to 540°C at a rate of 2.0°C / min to 5.0°C / min and holds for 900 min, then cools after leaving the furnace, and is secondarily rolled to the finished thickness of 0.22 mm;

[0034] (4) Trimming and cleaning: Produced using a tension leveller, the production speed is controlled at 80 m / min, the water temperature is 90°C, the pH value is 9, and the trimming amount is 20 mm * 2.

[0035] For the performance test of the finished product of the battery foil blank of the present invention above, the test method adopts "GB / T228.1 - 2021". The test results show that the tensile strength is 185 mpa, the elongation is 4.5%. The end face of the finished product is neat, without burrs, warping edges or wavy edges, and there are no defects such as roll marks, oil spots, and oil lines on the surface.

[0036] Comparative Example 1

[0037] First, control the composition and mass percentage of the battery foil blank as follows: Si 0.03%, Fe 0.17%, Cu 0.04%, Mn 0.01%, Mg 0.01%, Zn 0.01%, Zr 0.01%, Ti 0.02%, Al 99.60%.

[0038] According to the above composition control, further obtain the battery foil blank, and its specific preparation steps are as follows:

[0039] (1) Melting: During melting, the raw materials are fully stirred evenly. The melting temperature is between 730 and 750°C. Add the AIZr5 alloy ingot according to the ratio (ensuring the content of Zr), and stand for 30 min. Refine three times at 740°C for 30 min each time in the melting furnace. After the composition adjustment meets the control requirements of the present invention, pour the furnace, and the pouring temperature is 745°C;

[0040] (2) Continuous casting and rolling: During continuous casting and rolling production, the temperature of the degassing box is controlled at 730°C, the gas flow rate is controlled at 10 L / min, the rotor speed is controlled at 380 revolutions / min, the temperature of the filter box is controlled at 715°C, and a 50 + 60 - mesh plate + 7 - tube tube - type filter plate is used for three - stage filtration. The temperature of the fore - tank is 690°C, the casting and rolling zone is controlled at 58 mm, the opening of the casting nozzle is controlled at 5.5 mm, the casting and rolling linear speed is controlled at 860 mm / min, and the thickness of the continuously cast and rolled aluminum coil finished product is 6.3 mm;

[0041] (3) Cold rolling: The continuously cast and rolled aluminum coil is rolled (process flow arrangement: aluminum coil thickness 6.3mm - 3.5mm - 2.0mm - annealing - 0.85mm - 0.4mm - 0.22mm). The thickness measurement mass flow is turned on throughout the process. Annealing is carried out at a thickness of 2.0mm. The annealing process heats up to 560°C at a rate of 2.0°C / min to 5.0°C / min and holds for 840 minutes, then cools after leaving the furnace and is secondarily rolled to the finished thickness of 0.22mm;

[0042] (4) Trimming and cleaning: Produced using a stretcher leveller. The production speed is controlled at 80m / min, the water temperature is 90°C, the pH value is 9, and the trimming amount is 20mm * 2.

[0043] The performance of the battery foil blank finished product of the present invention is tested above. The test method uses "GB / T228.1 - 2021". The test results show that the tensile strength is 175mpa, the elongation is 3.7%. The end face of the finished product is neat, without burrs, warping edges or wavy edges, and there are no defects such as roll marks, oil spots, and oil lines on the surface.

[0044] Comparative Example 2

[0045] First, control its composition and mass percentage as follows: Si 0.04%, Fe 0.18%, Cu 0.045%, Mn 0.01%, Mg 0.01%, Zn 0.01%, Zr 0.06%, Ti 0.02%, Al 99.60%.

[0046] According to the above composition control, further obtain the battery foil blank. The specific preparation steps are as follows:

[0047] (1) Melting: During melting, the raw materials are fully stirred evenly. The melting temperature is 730 - 750°C. Add the AIZr5 alloy ingot according to the ratio, and let it stand for 30 minutes. Refine three times at 740°C for 30 minutes each time in the melting furnace using a special granular refining agent. After the composition adjustment meets the control requirements of the present invention, pour the furnace. The pouring temperature is 745°C;

[0048] (2) Continuous casting and rolling: During continuous casting and rolling production, the degassing box temperature is controlled at 730°C, the gas flow rate is controlled at 10L / min, the rotor speed is controlled at 380 revolutions / min, the filtration box temperature is controlled at 715°C, and a 50 + 60 - mesh plate + 7 - tube tubular filter plate is used for three - stage filtration. The front box temperature is 690°C, the casting and rolling zone is controlled at 58mm, the casting nozzle opening is controlled at 5.5mm, the continuous casting and rolling line speed is controlled at 860mm / min, and the thickness of the continuously cast and rolled aluminum coil finished product is 6.3mm;

[0049] (3) Cold rolling: The cast-rolled aluminum coil is rolled (process flow arrangement: 6.3 - 3.3 - 1.8 - annealing - 0.8 - 0.4 - 0.22 mm). The thickness measurement mass flow is turned on throughout the process. Annealing is carried out at a thickness of 1.8 mm. The annealing process heats up to 540 °C at a rate of 2.0 °C / min to 5.0 °C / min and holds for 900 min, then cools after leaving the furnace and is rolled a second time to the finished thickness of 0.22 mm;

[0050] (4) Trimming and cleaning: Produced using a stretch-bending straightening machine, the production speed is controlled at 80 m / min, the water temperature is 90 °C, the pH value is 9, and the trimming amount is 20 mm * 2.

[0051] The performance of the finished product of the battery foil blank of the present invention is tested. The test method uses "GB / T228.1 - 2021". The test results show that the tensile strength is 184 mpa, the elongation is 4.4%. The end face of the finished product is neat, without burrs, warping or wavy edges, and the surface has no defects such as roll marks, oil spots, and oil lines.

[0052] As can be seen from the above, by increasing the mass percentage of zirconium element in the aluminum alloy of the battery foil blank of the present invention and adjusting the cold rolling process, annealing temperature and finished product cleaning, the thickness of the battery foil blank product is 0.2 - 0.25 mm, the tensile strength ≥ 180 mpa, the elongation ≥ 4%, the end face of the finished product is neat, without burrs, warping or wavy edges, and the surface has no defects such as roll marks, oil spots, and oil lines, meeting the product requirements of high tensile strength, high elongation and low pinholes for the battery foil blank.

[0053] The above is only one embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-strength, high-elongation 1060 aluminum alloy battery foil raw material, characterized in that: It includes the following components and mass percentages: Si≤0.07%, Fe0.15-0.20%, Cu0.03-0.05%, Mn≤0.01%, Mg≤0.01%, Zn≤0.02%, Zr0.03-0.05%, Ti≤0.02%, and Al≥99.60%.

2. A method for producing high-strength, high-elongation 1060 aluminum alloy battery foil wool as claimed in claim 1, characterized in that: include: (1) Smelting: Smelting raw materials containing Si, Fe, CuO, M, Mg, Zn, Ti and Al, and adding AIZr5 alloy ingots according to the proportion when the smelting temperature is 730-760°C so that the Zr content is 0.03-0.05%; (2) Casting and rolling: The smelted material is cast and rolled into aluminum coils, and the finished product thickness is 6.0-6.5 mm; (3) Cold rolling: The finished aluminum coil is cold rolled for multiple times and then annealed. After annealing and cooling, it is rolled again for multiple times to form a rough finished product with a thickness of 0.2 to 0.25 mm. (4) Finished product trimming and cleaning: trimming and cleaning of finished raw materials.

3. The production method according to claim 2, characterized in that: In step (3), after the cold rolling is repeated for multiple passes to a thickness of 1.8 to 2.3 mm, intermediate annealing is performed, the annealing process is to increase the temperature to 480 to 550° C. at 2.0° C. / min to 5.0° C. / min, and the heat preservation time is 700 to 900 minutes. After being cooled out of the furnace, the rough material is repeatedly rolled to a finished product with a thickness of 0.2 to 0.25 mm.

4. The production method according to claim 3, characterized in that: In step (4), the trimming and cleaning are performed using a bending and straightening machine, the production speed is controlled at 60-80 m / min, the water temperature is ≥80° C., and the pH value is 8-10.