Preparation method of aluminum foil blank for 1060J alloy battery

Abstract

The invention relates to the technical field of aluminum alloy smelting and processing, in particular to a preparation method of an aluminum foil blank for a 1060J alloy battery, which comprises the steps of smelting and composition proportioning, heat preservation furnace refining, online treatment, cast rolling, cold rolling cogging, intermediate annealing, rolling after annealing, finished product rolling and the like, and the aluminum foil blank comprises the following alloy elements in percentage by mass: 0.17-0.20% of Fe, 0.02-0.05% of Si, 0.05-0.053% of Cu, 0.010-0.015% of Ti, less than or equal to 0.005% of Mn, less than or equal to 0.03% of V, less than or equal to 0.005% of Cr, 0.025-0.030% of Zn, less than or equal to 0.005% of Mg and more than or equal to 99.60% of Al; impurity elements such as V and Ti are controlled in the refining process, the thickness of the prepared high-conductivity 1060J aluminum alloy new energy battery aluminum foil blank ranges from 0.20 mm to 0.22 mm, the tensile strength Rm of the strip is detected to be larger than or equal to 170 MPa, the ductility A50 of the strip is detected to be larger than or equal to 3.5%, and the product performance completely meets the performance requirement of an aluminum foil for a current new energy automobile battery.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy strip preparation, and in particular to a method for preparing an aluminum foil blank for a 1060J alloy battery. Background Art

[0002] 1060 alloy aluminum sheet and strip has high purity and is industrial pure aluminum. It has good elongation and tensile strength, high plasticity, corrosion resistance, conductivity and thermal conductivity. With the rise of new energy vehicles in recent years, the application of 1060 alloy aluminum foil in power batteries has also become an important application field.

[0003] Due to its low alloy content, the conventional composition range of 1060 alloy has low strength and elongation performance after the thickness of new energy battery foil is 0.012-0.013mm, which cannot meet the use requirements. In view of the above problems, the present invention successfully develops a 1060J alloy high-strength and high-conductivity battery aluminum foil blank by adjusting the composition control range, optimizing the casting and rolling process, and improving the cold rolling and annealing process. The impurity elements such as V, Mn, Ti, and Cu that affect the conductivity are controlled. By reasonably matching the ratio of Cu and Zn elements and combining the annealing process principle of the second phase full analysis, the problem of low tensile strength and elongation of battery foil products can be effectively solved. The tensile strength of the obtained battery foil product at a thickness of 12 microns reaches 230MPa and the elongation reaches about 4%. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a 1060J alloy battery aluminum foil blank, which effectively solves the problem of low strength and elongation of conventional 1060 alloy battery foil, and realizes stable batch production of 1060 alloy high-strength and high-conductivity battery aluminum foil blanks.

[0005] In order to achieve the above object, the present invention provides a method for preparing a 1060J alloy battery aluminum foil blank, comprising the following steps: S1. Melting and composition ratio: The smelting furnace is charged with electrolytic aluminum liquid and remelted aluminum ingots as raw materials. The mass ratio of electrolytic aluminum liquid to remelted aluminum ingot is 30%:70%. The electrolytic aluminum liquid in the raw material is electrolytic aluminum liquid with Al99.80% or more; the remelted aluminum ingot in the raw material is remelted aluminum ingot with Al99.80% or more; Fe≤0.012%, Si≤0.05%, V≤0.03% in the raw material; after the charge is completely melted, the scum is scraped off, and after the scum is scraped to the mirror surface, the first refining is carried out when the temperature is raised to 725℃-735℃. The first refining adopts powder spray refining method, and argon + mixed refining agent is used to refine the melt. After the first refining is completed, the melt is formed after standing for 30 minutes. Adjust the proportion of each alloy element to Fe: 17% ~ 0.20%, Si: 0.02% ~ 0.05%, Cu: 0.05% ~ 0.053%, Ti ≤ 0.004%, Mn ≤ 0.005%, V ≤ 0.001%, Cr ≤ 0.005%, Zn: 0.025% ~ 0.030%, Mg ≤ 0.005%; after the composition adjustment meets the above requirements, use the powder spray refining method to use argon gas + remelting particle refining agent for the second refining, after the second refining, let it stand until the slag completely floats up, then skim the slag to the mirror surface, and after the aluminum liquid temperature reaches 750 ℃ ​​-755 ℃, pour the required aluminum alloy melt into the holding furnace; S2. Refining in a holding furnace: After the melt obtained in step S1 is poured into a holding furnace, melt refining is carried out in the holding furnace, and the melt is continuously provided to the casting and rolling mill; the holding furnace adopts air-permeable brick refining, and does not use artificial blowing technology. During the production period, the air-permeable bricks at the bottom of the furnace continue to work, and the aluminum melt is in a continuous blowing refining state; S3. Online processing: The melt obtained in step S2 is processed online. After the melt flows out of the holding furnace, it first passes through a degassing box. Al-Ti5-B1 ​​grain refiner wire rods are added to the degassing box inlet. After the Al-Ti5-B1 ​​grain refiner wire rods are preheated by flame, the degassing box uses a silicon nitride rotor for online degassing, and the online refining gas is argon; the aluminum liquid flows out of the degassing box and enters the first-stage filter box, and then flows out of the first-stage filter box and enters the second-stage filter box; S4. Casting and rolling: In order to improve the density of the grains of the cast-rolled billet strip, combined with actual production experience, the melt obtained in step S3 is cast and rolled, the casting zone length control range is set to 55mm-65mm, the casting nozzle opening is set to 9.5mm-12mm, and the casting speed is 800mm / min -950mm / min, using A-grade aluminum titanium boron wire according to the standard of 1.5kg / t·Al-2.5kg / t·Al for online addition, the casting and rolling cooling water temperature is 25℃-35℃, and the rolling force is increased after the plate is successfully erected to obtain 7.5mm-8.0mm casting and rolling billets, the proportion of each alloy element range is Fe: 0.17%~0.20%, Si: 0.02%~0.05%, Cu: 0.05%~0.053%, Ti: 0.010%~0.015%, Mn≤0.005%, V≤0.001%, Cr≤0.005%, Zn0.025%~0.030%, Mg≤0.005%, Al≥99.60%; S5. Cold rolling: cold rolling the cast strip obtained in step S4, the cold rolling process adopts the process of large processing rate in the first pass after the cogging pass and intermediate annealing, the cast strip obtained is rolled at a pass processing rate of 60% to obtain a 3.0mm-3.2mm billet, the roughness of the roller used is Ra0.55±0.02μm, the upper convex and lower flat combination is adopted, the upper roller has a convexity of 0.03mm, the lower roller has no convexity, and the rolling speed is controlled at 200 m / min-300m / min; S6. Intermediate annealing: The cold rolled blank obtained in step S5 is subjected to intermediate annealing by slowly heating up the blank. The intermediate annealing process is as follows: the strip is heated to a metal temperature of 400-430°C at a furnace temperature of 500°C and then transferred to a heat preservation stage for 4-5 hours and cooled out of the furnace; S7. Rolling after annealing: cold rolling the strip obtained in step S6 at a temperature below 40°C, performing intermediate pass processing at a pass processing rate of 40%-60% and then cooling naturally, the roughness of the roller used is 0.45±0.02μm, a double convex roller is used, the convexity of the upper roller is 0.02mm, the convexity of the lower roller is 0.02mm, and the rolling speed is controlled at 550m / min-650m / min to obtain a strip with a thickness of 1.2mm-1.9mm; S8. Finished product rolling: The strip obtained in step S7 is subjected to the last three processing steps at a temperature below 40°C and then naturally cooled. The roughness of the rollers used is 0.35±0.02μm. A double convex roller is used, with an upper roller convexity of 0.02mm and a lower roller convexity of 0.02mm. After the finished product is trimmed, the battery foil aluminum foil blank is processed. According to this process, the strip is rolled to the H18 state with a thickness of 0.20mm-0.22mm. The tensile strength of the strip is tested to be Rm≥170MPa, and the elongation A 50 ≥3.5%, the alloy battery foil blank is processed.

[0006] Furthermore, the specific components of the mixed refining agent in step S1 are remelting particle refining agent: KBF 4 =1:1; reduce the content of V and Ti in the melt through refining measures.

[0007] Furthermore, in step S, the first-stage filter box adopts a bipolar 40PPI+60PPI ceramic filter plate, and the second-stage filter box adopts a 70PPI tubular filter. The inclusion and gas content in the melt is controlled at a low level by the double filtration method. After the melt is treated online, the hydrogen content is controlled below 0.10ml / 100g·Al.

[0008] Furthermore, in step S8, the three rolling passes are all performed at high speed, and the rolling speed is all above 800 mm / min. The temperature of the strip during rolling deformation is controlled at 120°C-150°C. By adopting the technical measures of rolling and temperature control, the degree of recovery of the internal structure of the strip during the rolling process is controlled at a certain temperature, thereby improving the elongation performance of the 1060 alloy battery foil blank, and further improving the elongation performance of the battery foil finished product.

[0009] The beneficial effects of the present invention are as follows: the present invention reduces the contents of V and Ti in the melt through the refining measures in step S1; controls the contents of inclusions and gas in the melt at a relatively low level through a double filtration method; through the technical measures of controlled rolling and temperature control, the degree of recovery of the internal structure of the strip during the rolling process is controlled by a certain temperature, thereby improving the elongation performance of the 1060 alloy battery foil blank, and further improving the elongation performance of the battery foil finished product; the thickness of the high-conductivity 1060J aluminum alloy new energy battery aluminum foil blank prepared by the present invention is 0.20 mm-0.22 mm, the tensile strength of the strip is detected to be Rm≥170 MPa, and the elongation A is 50 ≥3.5%, the product performance fully meets the current performance requirements of aluminum foil for new energy vehicle batteries; the aluminum foil produced by the method of the present invention greatly improves the tensile strength of the aluminum foil on the basis of ensuring the elongation. DETAILED DESCRIPTION

[0010] The present invention provides a method for preparing a 1060J alloy battery aluminum foil blank, comprising the following steps: S1. Melting and composition ratio: The smelting furnace is charged with electrolytic aluminum liquid and remelted aluminum ingots as raw materials. The mass ratio of electrolytic aluminum liquid to remelted aluminum ingot is 30%:70%. The electrolytic aluminum liquid in the raw material is electrolytic aluminum liquid with Al99.80% or more; the remelted aluminum ingot in the raw material is remelted aluminum ingot with Al99.80% or more; Fe≤0.012%, Si≤0.05%, V≤0.03% in the raw material; after the charge is completely melted, the slag is scraped off, and after the slag is scraped to the mirror surface, the first refining is carried out when the temperature is raised to 725℃-735℃. The first refining adopts powder spray refining method, and argon + mixed refining agent is used to refine the melt. The specific composition of the mixed refining agent is remelting particle refining agent: KBF 4 =1:1, after the first refining is completed and the melt is allowed to stand for 30 minutes, the composition is adjusted, and the proportion of each alloy element is adjusted to Fe: 17% ~ 0.20%, Si: 0.02% ~ 0.05%, Cu: 0.05% ~ 0.053%, Ti ≤ 0.004%, Mn ≤ 0.005%, V ≤ 0.001%, Cr ≤ 0.005%, Zn: 0.025% ~ 0.030%, Mg ≤ 0.005%; after the composition adjustment meets the above requirements, the second refining is carried out by powder spraying refining using argon gas + remelting particle refining agent. After the second refining, stand and wait for the slag to float completely, then skim the slag to the mirror surface, and after the aluminum liquid temperature reaches 750 ℃ ​​-755 ℃, pour the required aluminum alloy melt into the holding furnace; S2. Refining in a holding furnace: After the melt obtained in step S1 is poured into a holding furnace, melt refining is carried out in the holding furnace, and the melt is continuously provided to the casting and rolling mill; the holding furnace adopts air-permeable brick refining, and does not use artificial blowing technology. During the production period, the air-permeable bricks at the bottom of the furnace continue to work, and the aluminum melt is in a continuous blowing refining state; S3. Online processing: The melt obtained in step S2 is processed online. After the melt flows out of the holding furnace, it first passes through a degassing box. Al-Ti5-B1 ​​grain refiner wire rods are added to the degassing box inlet. After the Al-Ti5-B1 ​​grain refiner wire rods are preheated by flame, the degassing box uses a silicon nitride rotor for online degassing, and the online refining gas is argon; after the aluminum liquid flows out of the degassing box, it enters the first-stage filter box, which uses a bipolar 40+60PPI ceramic filter plate, and after the aluminum liquid flows out of the first-stage filter box, it enters the second-stage filter box, which uses a 70PPI filter tube; after the melt is processed online, the hydrogen content is controlled below 0.10ml / 100g·Al; S4. Casting and rolling: In order to improve the density of the grains of the cast-rolled billet strip, combined with actual production experience, the melt obtained in step S3 is cast and rolled, the casting zone length control range is set to 55mm-65mm, the casting nozzle opening is set to 9.5mm-12mm, and the casting speed is 800mm / min -950mm / min, using A-grade aluminum titanium boron wire according to the standard of 1.5kg / t·Al-2.5kg / t·Al for online addition, the casting and rolling cooling water temperature is 25℃-35℃, and the rolling force is increased after the plate is successfully erected to obtain 7.5mm-8.0mm casting and rolling billets, the proportion of each alloy element range is Fe: 0.17%~0.20%, Si: 0.02%~0.05%, Cu: 0.05%~0.053%, Ti: 0.010%~0.015%, Mn≤0.005%, V≤0.001%, Cr≤0.005%, Zn0.025%~0.030%, Mg≤0.005%, Al≥99.60%; S5. Cold rolling: cold rolling the cast strip obtained in step S4, the cold rolling process adopts the process of large processing rate in the first pass after the cogging pass and intermediate annealing, the cast strip obtained is rolled at a pass processing rate of 60% to obtain a 3.0mm-3.2mm billet, the roughness of the roller used is Ra0.55±0.02μm, the upper convex and lower flat combination is adopted, the upper roller has a convexity of 0.03mm, the lower roller has no convexity, and the rolling speed is controlled at 200 m / min-300m / min; S6. Intermediate annealing: The cold rolled blank obtained in step S5 is subjected to intermediate annealing by slowly heating up the blank. The intermediate annealing process is as follows: the strip is heated to a metal temperature of 400-430°C at a furnace temperature of 500°C and then transferred to a heat preservation stage for 4-5 hours and cooled out of the furnace; S7. Rolling after annealing: cold rolling the strip obtained in step S6 at a temperature lower than 40°C, naturally cooling after intermediate processing at a processing rate of 40%-60%, the roughness of the roller used is 0.45±0.02μm, and a double convex roller is used, with an upper roller convexity of 0.02mm and a lower roller convexity of 0.02mm. The rolling speed is controlled at 550m / min-650m / min to obtain a strip with a thickness of 1.2mm-1.9mm.

[0011] S8. Finished product rolling: The strip obtained in step S7 is subjected to the last three processing steps at a temperature below 40°C and then naturally cooled. The three rolling steps are all performed at high speed, and the rolling speed is all above 800mm / min. The temperature of the strip during rolling deformation is controlled at 120°C-150°C. The roughness of the rollers used is 0.35±0.02μm, and a double convex roller is used, with an upper roller convexity of 0.02mm and a lower roller convexity of 0.02mm. After the finished product is trimmed, the processing of the battery foil aluminum foil blank is completed. According to this process, the strip is rolled to the H18 state, with a thickness of 0.20mm-0.22mm. The tensile strength of the strip is tested to be Rm≥170MPa, and the elongation A is 0.02mm. 50 ≥3.5%, the alloy battery foil blank is processed.

[0012] Embodiment 1: S1. The smelting furnace is charged with 30% electrolytic aluminum liquid with an Al content of more than 99.80% and 70% remelted aluminum ingots with an Al content of more than 99.80% as raw materials. Among the above raw materials, Fe: 0.10%, Si: 0.04%, V: 0.01%; after the charge is completely melted, the slag is scraped off, and after the slag is scraped to the mirror surface, the temperature is raised to 725℃ for the first refining. The powder spray refining method is adopted, and the melt is refined using argon gas + mixed refining agent. The specific composition of the mixed refining agent is remelting particle refining agent: KBF 4 =1:1, after refining and standing for 30 minutes, the composition of the melt is adjusted. According to the preparation method of 1060J alloy battery aluminum foil blank, the proportion of each alloy element is adjusted to the following range: Fe: 0.17%, Si: 0.02%, Cu: 0.05%, Ti: 0.002%, Mn: = 0.001%, V: 0.0005%, Cr: 0.001%, Zn: 0.025%, Mg: 0.001%. After the composition is configured in place, the second refining is carried out by using argon gas + remelting particle refining agent by powder spray refining. After refining, the slag is completely floated and then the slag is skimmed to the mirror surface. After the aluminum liquid temperature reaches 750°C, the required aluminum alloy melt is poured into the holding furnace.

[0013] S2. Refining in a holding furnace: Pour the melt obtained in step 1 into a holding furnace, carry out melt refining in the holding furnace, and continuously provide melt to the casting and rolling mill. The holding furnace adopts air-permeable brick refining technology, and does not use artificial blowing technology. During production, the air-permeable bricks at the bottom of the furnace continue to work, and the aluminum melt is in a continuous blowing refining state.

[0014] S3. Online processing: The melt obtained in step 2 is processed online. After the melt flows out of the holding furnace, it first passes through the degassing box. Al-Ti5-B1 ​​grain refiner wire rods are added to the degassing box entrance. After the Al-Ti5-B1 ​​grain refiner wire rods are preheated by flames, the degassing box uses a silicon nitride rotor for online degassing, and the online refining gas is argon. After the aluminum liquid flows out of the degassing box, it enters the first-stage filter box, which uses a bipolar 40+60PPI ceramic filter plate. After the aluminum liquid flows out of the first-stage filter box, it enters the second-stage filter box, which uses a 70PPI filter tube. After online processing, the hydrogen content is controlled at 0.085ml / 100g·Al.

[0015] S4. Casting and rolling: In order to improve the density of the grain structure of the cast-rolled billet strip, combined with the actual production experience, the melt obtained in step 3 was cast-rolled, the length control range of the casting and rolling zone was set to 55 mm, the casting nozzle opening was set to 9.5 mm, the casting and rolling speed was 800 mm / min, and grade A aluminum titanium boron wire was added online according to the standard of 1.5 kg / t·Al. The casting and rolling cooling water temperature was 25°C, and the rolling force was increased after the plate was successfully erected to obtain a 7.5 mm cast-rolled billet with a ratio range of alloy elements: Fe: 0.17%, Si: 0.02%, Cu: 0.05%, Ti: 0.010%, Mn: 0.005%, V: 0.001%, Cr: 0.005%, Zn: 0.025%, Mg: 0.005%, Al: 99.71%.

[0016] S5. Cold rolling: The cast strip obtained in step 4 is cold rolled. The cold rolling process adopts a large processing rate process for the first pass after the blanking pass and intermediate annealing. The cast strip obtained is rolled at a pass processing rate of 60% to obtain a 3.0 mm billet. The roughness of the roller used is Ra0.53μm. The upper convex and lower flat combination is adopted. The upper roller has a convexity of 0.03mm and a lower roller has a convexity of 0.00mm. The rolling speed is controlled at 200m / min.

[0017] S6. Intermediate annealing: The cold-rolled blank obtained in step 5 is subjected to intermediate annealing by slowly heating up the blank. The intermediate annealing process is as follows: the strip obtained in claim 1 is heated to a metal temperature of 400°C at a furnace gas temperature of 500°C and then transferred to a heat preservation stage for 4 hours and then cooled out of the furnace.

[0018] S7. Rolling after annealing: The strip obtained in S6 is cold rolled at a temperature below 40°C, and is naturally cooled after intermediate passes at a pass processing rate of 40%. The roughness of the roller used is Ra0.43μm. A double convex roller is used, with an upper roller convexity of 0.02mm and a lower roller convexity of 0.02mm. The rolling speed is controlled at 550m / min to obtain a strip with a thickness of 1.2mm.

[0019] S8. Finished product rolling: The strip obtained in step 7 is subjected to the last three processing steps at a temperature of 35°C and then naturally cooled. The three rolling steps are all high-speed rolling, and the rolling speed is 800mm / min. The temperature of the strip during rolling deformation is controlled at 120°C. The roughness of the roller used is Ra0.33μm, and a double convex roller is used. The convexity of the upper roller is 0.02mm, and the convexity of the lower roller is 0.02mm. After the finished product is trimmed, the processing of the battery foil aluminum foil blank is completed. According to this process, the strip is rolled to the H18 state with a thickness of 0.20mm. The tensile strength of the strip is tested to be Rm=170MPa, and the elongation A 50 =3.5%, 1060J alloy battery foil blank processing is completed.

[0020] Embodiment 2: S1. Melting and composition ratio: The smelting furnace is charged with 30% electrolytic aluminum liquid with Al99.85% content and 70% remelting aluminum ingot with Al99.85% content as raw materials. The above raw materials are required to contain 0.012% Fe, 0.05% Si and 0.03% V. After the charge is completely melted, the slag is removed. After the slag is removed to the mirror surface, the temperature is raised to 735℃ for the first refining. The powder spray refining method is adopted, and the melt is refined using argon gas + mixed refining agent. The specific composition of the mixed refining agent is remelting particle refining agent: KBF 4 =1:1, after refining and standing for 30 minutes, the composition of the melt is adjusted. According to the preparation method of 1060J alloy battery aluminum foil blank, the proportion of each alloy element is adjusted to the following range: Fe: 0.20%, Si: 0.05%, Cu: 0.053%, Ti: 0.004%, Mn: 0.005%, V: 0.001%, Cr: 0.005%, Zn: 0.030%, Mg: 0.005%. After the composition is configured in place, the second refining is carried out by using argon gas + remelting particle refining agent by powder spray refining. After refining, the slag is completely floated and then the slag is removed to the mirror surface. After the aluminum liquid temperature reaches 755℃, the required aluminum alloy melt is poured into the holding furnace.

[0021] S2. Refining in a holding furnace: Pour the melt obtained in step 1 into a holding furnace, carry out melt refining in the holding furnace, and continuously provide melt to the casting and rolling mill. The holding furnace adopts air-permeable brick refining technology, and does not use artificial blowing technology. During production, the air-permeable bricks at the bottom of the furnace continue to work, and the aluminum melt is in a continuous blowing refining state.

[0022] S3. Online processing: The melt obtained in step 2 is processed online. After the melt flows out of the holding furnace, it first passes through the degassing box. Al-Ti5-B1 ​​grain refiner wire rods are added to the degassing box entrance. After the Al-Ti5-B1 ​​grain refiner wire rods are preheated by flames, the degassing box uses a silicon nitride rotor for online degassing, and the online refining gas is argon. After the aluminum liquid flows out of the degassing box, it enters the first-stage filter box, which uses a bipolar 40+60PPI ceramic filter plate. After the aluminum liquid flows out of the first-stage filter box, it enters the second-stage filter box, which uses a 70PPI filter tube. After online processing, the hydrogen content is controlled at 0.10ml / 100g·Al.

[0023] S4. Casting and rolling: In order to improve the density of the grain structure of the cast-rolled billet strip, combined with the actual production experience, the melt obtained in step 3 was cast-rolled, the length control range of the casting and rolling zone was set to 65mm, the casting nozzle opening was set to 12mm, the casting and rolling speed was 950mm / min, and grade A aluminum titanium boron wire was added online according to the standard of 2.5kg / t·Al. The casting and rolling cooling water temperature was 35°C, and the rolling force was increased after the plate was successfully erected to obtain a 8.0mm cast-rolled billet with the following alloy element ratio ranges: Fe: 0.20%, Si: 0.05%, Cu: 0.053%, Ti: 0.015%, Mn: 0.005%, V: 0.001%, Cr: 0.005%, Zn: 0.030%, Mg: 0.005%, Al: 99.64%.

[0024] S5. Cold rolling: The cast strip obtained in step 4 is cold rolled. The cold rolling process adopts a large processing rate process for the first pass after the blanking pass and intermediate annealing. The cast strip obtained is rolled at a pass processing rate of 60% to obtain a 3.2 mm billet. The roughness of the roller used is Ra0.57μm. The upper convex and lower flat combination is adopted. The upper roller has a convexity of 0.03mm and a lower roller has a convexity of 0.00mm. The rolling speed is controlled at 300m / min.

[0025] S6. Intermediate annealing: The cold-rolled blank obtained in step 5 is subjected to intermediate annealing by slowly heating up the blank. The intermediate annealing process is as follows: the strip obtained in claim 1 is heated to a metal temperature of 430°C at a furnace temperature of 500°C and then transferred to a heat preservation stage for 5 hours and then cooled out of the furnace.

[0026] S7. Rolling after annealing: The strip obtained in step S6 is cold rolled at a temperature of 40°C, and is naturally cooled after intermediate passes at a pass processing rate of 60%. The roughness of the roller used is 0.47μm. A double convex roller is used, with an upper roller convexity of 0.02mm and a lower roller convexity of 0.02mm. The rolling speed is controlled at 650m / min to obtain a strip with a thickness of 1.9mm.

[0027] S8. Finished product rolling: The strip obtained in step 7 is subjected to the last three passes at a temperature of 40°C and then naturally cooled. The three passes are all high-speed rolling, and the rolling speed is 900 mm / min. The temperature of the strip during rolling deformation is controlled at 150°C. The roughness of the roller used is 0.37 μm, and a double convex roller is used. The convexity of the upper roller is 0.02 mm, and the convexity of the lower roller is 0.02 mm. After the finished product is trimmed, the processing of the battery foil aluminum foil blank is completed. According to this process, the strip is rolled to the H18 state with a thickness of 0.22 mm. The tensile strength of the strip is tested to be Rm=170 MPa, and the elongation A 50 =4.2%, 1060J alloy battery foil blank processing is completed.

[0028] The 0.22mm thick aluminum foil blank prepared by the method for preparing a 1060J alloy high-strength and high-conductivity battery aluminum foil blank of the present invention has a tensile strength of 160MPa-175MPa and an elongation of 4.0%-5.0%; when a 0.012mm thick double-sided light lithium ion battery foil is produced by foil rolling, its tensile strength is 210MPa-220MPa and the elongation is 4.0%-4.5%. The aluminum foil produced by the method of the present invention greatly improves the tensile strength of the aluminum foil on the basis of ensuring the elongation.

Claims

1. A method for preparing aluminum foil blank for 1060J alloy battery, characterized in that The processing steps include: S1. Melting and composition ratio: The smelting furnace is charged with electrolytic aluminum liquid and remelted aluminum ingots as raw materials. The mass ratio of electrolytic aluminum liquid to remelted aluminum ingot is 30%:70%. The electrolytic aluminum liquid in the raw material is electrolytic aluminum liquid with Al99.80% or more; the remelted aluminum ingot in the raw material is remelted aluminum ingot with Al99.80% or more; Fe≤0.012%, Si≤0.05%, V≤0.03% in the raw material; after the charge is completely melted, the scum is scraped off, and after the scum is scraped to the mirror surface, the first refining is carried out when the temperature is raised to 725℃-735℃. The first refining adopts powder spray refining method, and argon + mixed refining agent is used to refine the melt. After the first refining is completed, the melt is formed after standing for 30 minutes. Adjust the proportion of each alloy element to Fe: 17% ~ 0.20%, Si: 0.02% ~ 0.05%, Cu: 0.05% ~ 0.053%, Ti ≤ 0.004%, Mn ≤ 0.005%, V ≤ 0.001%, Cr ≤ 0.005%, Zn: 0.025% ~ 0.030%, Mg ≤ 0.005%; after the composition adjustment meets the above requirements, use the powder spray refining method to use argon gas + remelting particle refining agent for the second refining, after the second refining, let it stand until the slag completely floats up, then skim the slag to the mirror surface, and after the aluminum liquid temperature reaches 750 ℃ ​​-755 ℃, pour the required aluminum alloy melt into the holding furnace; S2. Refining in a holding furnace: After the melt obtained in step S1 is poured into a holding furnace, melt refining is carried out in the holding furnace, and the melt is continuously provided to the casting and rolling mill; the holding furnace adopts air-permeable brick refining, and does not use artificial blowing technology. During the production period, the air-permeable bricks at the bottom of the furnace continue to work, and the aluminum melt is in a continuous blowing refining state; S3. Online processing: The melt obtained in step S2 is processed online. After the melt flows out of the holding furnace, it first passes through a degassing box. Al-Ti5-B1 ​​grain refiner wire rods are added to the degassing box inlet. After the Al-Ti5-B1 ​​grain refiner wire rods are preheated by flame, the degassing box uses a silicon nitride rotor for online degassing, and the online refining gas is argon; the aluminum liquid flows out of the degassing box and enters the first-stage filter box, and then flows out of the first-stage filter box and enters the second-stage filter box; S4. Casting: The melt obtained in step S3 is cast and rolled, the casting zone length control range is set to 55mm-65mm, the casting nozzle opening is set to 9.5mm-12mm, and the casting speed is 800mm / min -950mm / min, using A-grade aluminum titanium boron wire according to the standard of 1.5kg / t·Al-2.5kg / t·Al for online addition, the casting and rolling cooling water temperature is 25℃-35℃, and the rolling force is increased after the plate is successfully erected to obtain 7.5mm-8.0mm casting and rolling billets, the proportion of each alloy element range is Fe: 0.17%~0.20%, Si: 0.02%~0.05%, Cu: 0.05%~0.053%, Ti: 0.010%~0.015%, Mn≤0.005%, V≤0.001%, Cr≤0.005%, Zn0.025%~0.030%, Mg≤0.005%, Al≥99.60%; S5. Cold rolling: cold rolling the cast strip obtained in step S4, the cold rolling process adopts the process of large processing rate in the first pass after the cogging pass and intermediate annealing, the cast strip obtained is rolled at a pass processing rate of 60% to obtain a 3.0mm-3.2mm billet, the roughness of the roller used is Ra0.55±0.02μm, the upper convex and lower flat combination is adopted, the upper roller has a convexity of 0.03mm, the lower roller has no convexity, and the rolling speed is controlled at 200 m / min-300m / min; S6. Intermediate annealing: The cold rolled blank obtained in step S5 is subjected to intermediate annealing by slowly heating up the blank. The intermediate annealing process is as follows: the strip is heated to a metal temperature of 400-430°C at a furnace temperature of 500°C and then transferred to a heat preservation stage for 4-5 hours and cooled out of the furnace; S7. Rolling after annealing: cold rolling the strip obtained in step S6 at a temperature below 40°C, performing intermediate pass processing at a pass processing rate of 40%-60% and then cooling naturally, the roughness of the roller used is 0.45±0.02μm, a double convex roller is used, the convexity of the upper roller is 0.02mm, the convexity of the lower roller is 0.02mm, and the rolling speed is controlled at 550m / min-650m / min to obtain a strip with a thickness of 1.2mm-1.9mm; S8. Finished product rolling: The strip obtained in step S7 is subjected to the last three processing steps at a temperature below 40°C and then naturally cooled. The roughness of the rollers used is 0.35±0.02μm. A double convex roller is used, with an upper roller convexity of 0.02mm and a lower roller convexity of 0.02mm. After the finished product is trimmed, the battery foil aluminum foil blank is processed. According to this process, the strip is rolled to the H18 state with a thickness of 0.20mm-0.22mm. The tensile strength of the strip is tested to be Rm≥170MPa, and the elongation A 50 ≥3.5%, the alloy battery foil blank is processed.

2. The method for preparing a 1060J alloy battery aluminum foil blank according to claim 1, characterized in that: The specific composition of the mixed refining agent in step S1 is remelting particle refining agent: KBF4=1:

1.

3. The method for preparing a 1060J alloy battery aluminum foil blank according to claim 1, characterized in that: In the step S, the first-stage filter box adopts a bipolar 40PPI+60PPI ceramic filter plate, and the second-stage filter box adopts a 70PPI tubular filter. After the melt is treated online, the hydrogen content is controlled below 0.10ml / 100g·Al.

4. The method for preparing a 1060J alloy battery aluminum foil blank according to claim 1, characterized in that: In step S8, the three rolling passes are all high-speed rolling, the rolling speed is all above 800 mm / min, and the temperature of the strip during rolling deformation is controlled at 120° C.-150° C.