A new method for manufacturing aluminum alloy strip for battery protection

Abstract

A method for manufacturing a novel aluminum alloy strip for battery protection belongs to the field of aluminum alloy processing. It solves the problem of easy cracking and poor explosion resistance of existing aluminum alloy strips during stamping. Method: 1. Prepare square ingot billets; 2. Heat and roll into 0.2mm thin plates; 3. Anneal and cut to obtain strips with a width of 50-60mm. The novel alloy prepared in the present invention is annealed after rolling, which meets the requirements of battery protection products for the plastic forming performance of the novel alloy strip. The prepared aluminum alloy strip has excellent plasticity and structure in industrial production. After annealing heat treatment, the strip obtains a more uniform recrystallized structure and ideal grain size control, which makes the alloy strip have better plastic forming ability, which is beneficial to the processing and forming of battery protection products and improves the protection performance. It is not easy to crack during stamping and has strong explosion resistance, which meets the high forming performance and protection requirements of the aluminum alloy strip for new batteries.

Description

Technical Field

[0001] The invention belongs to the field of aluminum alloy processing, and particularly relates to a method for manufacturing a novel aluminum alloy strip for battery protection. Background Art

[0002] Aluminum alloy battery protection sheets are thin sheets that are resistant to strong ultrasonic shocks and can effectively prevent battery explosions. They are primarily used in power batteries and energy storage batteries, particularly in new energy vehicles. With the rapid development of new energy vehicles in my country, safety and protection requirements are becoming increasingly stringent, leading to increasingly stringent demands for material blast resistance and formability. However, existing commonly used aluminum alloy strips for battery protection suffer from low plasticity, resulting in cracking during stamping and poor blast resistance, making them unable to meet the high performance and protection requirements of new energy vehicles. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for manufacturing a novel aluminum alloy strip for battery protection, so as to solve the problems of easy cracking and poor explosion resistance of existing aluminum alloy strips during stamping.

[0004] A method for manufacturing a novel aluminum alloy strip for battery protection is carried out according to the following steps:

[0005] 1. Blank preparation:

[0006] The blank composition is as follows: Fe: 1.0% to 1.6%, Mn: 0.2% to 0.6%, Ti: 0.01% to 0.1%, V: 0.03% to 0.15% and the balance Al; raw materials are weighed according to the blank composition and then smelted; and a semi-continuous casting method is used to prepare a square ingot blank;

[0007] 2. Heating and rolling:

[0008] The square ingot was placed in a resistance heating furnace for heating, and then rolled on a two-roll hot rolling mill at room temperature to obtain a thin plate with a thickness of 0.2 mm.

[0009] 3. Annealing and slitting:

[0010] The 0.2mm thick sheet is placed in an air cushion heating furnace and heated at 400°C for 60-90s to obtain an annealed sheet. After cleaning, it is cut into strips with a width of 50-60mm, thus completing the manufacture of the new aluminum alloy strip for battery protection.

[0011] Furthermore, in step 1, the composition of the blank is as follows: Fe: 1.5%, Mn: 0.3%, Ti: 0.05%, V: 0.1% and the balance Al in terms of mass percentage.

[0012] Furthermore, the dimensions of the Chinese ingot in step 1 are: thickness 500 mm, width 1200 mm.

[0013] Furthermore, the heating in step 2 is: heating at 600° C. for 5 to 20 hours, then cooling to 450 to 500° C. at a rate of 10 to 50° C. / h, and then heating for 5 to 20 hours.

[0014] Furthermore, the room temperature rolling in step 2 is as follows: at room temperature, the steel sheet is rolled on a two-roll hot rolling mill through 10 to 20 passes to a thickness of 5 mm, and after coiling, the steel sheet is further rolled on a two-roll cold rolling mill through 2 to 5 passes to a thickness of 0.2 mm.

[0015] Furthermore, the operating speed of the air cushion heating furnace in step three is 20 to 30 m / s.

[0016] Furthermore, the slitting in step three is performed using a precision shearing machine.

[0017] Beneficial effects of the present invention:

[0018] 1. Based on the original 8 series aluminum alloy, the present invention optimizes the content of main elements and trace elements and adds V elements that enhance superplasticity to form a new alloy. After rolling, the alloy is annealed and uses methods such as fine grain strengthening, substructure strengthening and deformation strengthening to meet the plastic forming performance requirements of battery protection products for new alloy strips. The prepared aluminum alloy strip has excellent plasticity and structure in industrial production.

[0019] 2. This invention utilizes V and Ti elements to refine grains and enhance plasticity, facilitating forming. Furthermore, rolling deformation and annealing treatments achieve fine grain control and significantly enhance plasticity in the alloy strip. Annealing heat treatment results in a more uniform recrystallized structure and ideally controlled grain size, giving the alloy strip excellent plastic forming capabilities. This facilitates the processing and forming of battery protection products, improving their protective properties. Stamping also reduces cracking and offers strong explosion resistance, meeting the high formability and protective requirements of aluminum alloy strips for new batteries.

[0020] 3. The tensile strength of the 0.2mm thick strip in the O state tested in accordance with GB / T16865 "Test specimens and methods for tensile testing of deformed aluminum, magnesium and their alloy products" is 106-112MPa, the yield strength is 57-71MPa, and the elongation after fracture is 45-53%, which is 22.5% higher than that of 8014 aluminum alloy strip; the stamping and blasting value at room temperature is 5.0-5.5MPa, which is more than 17% higher than that of 8014 aluminum alloy strip.

[0021] The invention is suitable for manufacturing aluminum alloy strips for battery protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The recrystallization structure diagram of the strip prepared in the embodiment is shown in FIG. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.

[0024] Specific embodiment 1: This embodiment is a method for manufacturing a new type of aluminum alloy strip for battery protection, which is carried out according to the following steps:

[0025] 1. Blank preparation:

[0026] The blank composition is as follows: Fe: 1.0% to 1.6%, Mn: 0.2% to 0.6%, Ti: 0.01% to 0.1%, V: 0.03% to 0.15% and the balance Al; raw materials are weighed according to the blank composition and then smelted; and a semi-continuous casting method is used to prepare a square ingot blank;

[0027] 2. Heating and rolling:

[0028] The square ingot was placed in a resistance heating furnace for heating, and then rolled on a two-roll hot rolling mill at room temperature to obtain a thin plate with a thickness of 0.2 mm.

[0029] 3. Annealing and slitting:

[0030] The 0.2mm thick sheet is placed in an air cushion heating furnace and heated at 400°C for 60-90s to obtain an annealed sheet. After cleaning, it is cut into strips with a width of 50-60mm, thus completing the manufacture of the new aluminum alloy strip for battery protection.

[0031] In step 1 of this embodiment, some inevitable impurity elements may exist in the blank composition, and the impurity content is less than 0.001%.

[0032] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the blank composition in step 1 is as follows: Fe: 1.5%, Mn: 0.3%, Ti: 0.05%, V: 0.1% by mass, and the balance is Al. The other steps and parameters are the same as those in specific embodiment 1.

[0033] Specific embodiment 3: This embodiment differs from specific embodiment 1 in that the blank composition in step 1 is as follows: Fe: 1.4%, Mn: 0.4%, Ti: 0.05%, V: 0.12% by mass, and the balance is Al. The other steps and parameters are the same as those in specific embodiment 1.

[0034] Specific embodiment 4: This embodiment differs from specific embodiment 1 in that the size of the Chinese ingot in step 1 is: thickness 500 mm, width 1200 mm. Other steps and parameters are the same as those in specific embodiment 1.

[0035] Specific embodiment 5: This embodiment differs from specific embodiment 1 in that the heating in step 2 is performed at 600°C for 5 to 20 hours, followed by cooling to 450 to 500°C at a rate of 10 to 50°C / h, and then heating for another 5 to 20 hours. The other steps and parameters are the same as those in specific embodiment 1.

[0036] Specific embodiment 6: This embodiment differs from specific embodiment 5 in that the heating in step 2 is performed at 600°C for 10 hours, then cooled to 480°C at a rate of 20°C / hour, and then heated for another 10 hours. The other steps and parameters are the same as those in specific embodiment 5.

[0037] Specific Embodiment 7: This embodiment differs from Specific Embodiment 1 in that, in step 2, room temperature rolling is performed on a two-roll hot rolling mill at room temperature in 10 to 20 passes to a thickness of 5 mm. After coiling, the steel is further rolled on a two-roll cold rolling mill at room temperature in 2 to 5 passes to a thickness of 0.2 mm. Other steps and parameters are the same as those in Specific Embodiment 1.

[0038] Specific Embodiment 8: This embodiment differs from Specific Embodiment 7 in that, in step 2, room temperature rolling is performed on a two-roll hot rolling mill at room temperature through 15 passes to a thickness of 5 mm. After coiling, the steel is further room temperature rolled on a two-roll cold rolling mill through four passes to a thickness of 0.2 mm. Other steps and parameters are the same as those in Specific Embodiment 7.

[0039] Specific embodiment 9: This embodiment differs from specific embodiment 1 in that the operating speed of the air cushion heating furnace in step 3 is 20-30 m / s. Other steps and parameters are the same as those in specific embodiment 1.

[0040] Specific embodiment 10: This embodiment differs from specific embodiment 1 in that the slitting in step 3 is performed using a fine shearing machine. The other steps and parameters are the same as those in specific embodiment 1.

[0041] The beneficial effects of the present invention are verified by the following examples:

[0042] Example:

[0043] A method for manufacturing a novel aluminum alloy strip for battery protection is carried out according to the following steps:

[0044] 1. Blank preparation:

[0045] The blank composition is as follows: Fe: 1.5%, Mn: 0.3%, Ti: 0.05%, V: 0.1% and the balance Al by weight, and then the raw materials are weighed according to the blank composition and smelted, and then a semi-continuous casting method is used to prepare the square ingot blank;

[0046] 2. Heating and rolling:

[0047] The square ingot was placed in a resistance heating furnace for heating, and then rolled on a two-roll hot rolling mill at room temperature to obtain a thin plate with a thickness of 0.2 mm.

[0048] 3. Annealing and slitting:

[0049] The 0.2mm thick sheet was placed in an air cushion heating furnace and heated at 400°C for 70 seconds to obtain an annealed sheet. After cleaning, it was cut into strips with a width of 55mm, completing the manufacture of the new aluminum alloy strip for battery protection.

[0050] In step 1 of this embodiment, the composition of the blank is as follows: Fe: 1.5%, Mn: 0.3%, Ti: 0.05%, V: 0.1% and the balance Al in terms of mass percentage.

[0051] The dimensions of the Chinese ingot in step 1 of this embodiment are: thickness 500 mm, width 1200 mm.

[0052] The heating in step 2 of this embodiment is as follows: heating at 600° C. for 10 h, then cooling to 480° C. at a rate of 20° C. / h, and heating for another 10 h.

[0053] The room temperature rolling in step 2 of this embodiment is as follows: at room temperature, the steel sheet is rolled on a two-roll hot rolling mill through 15 passes to a thickness of 5 mm, and then, after coiling, is continuously rolled on a two-roll cold rolling mill at room temperature for another 4 passes to a thickness of 0.2 mm.

[0054] The operating speed of the air cushion heating furnace in step 3 of this embodiment is 25 m / s.

[0055] The slitting described in step 3 of this embodiment uses a precision shearing machine.

[0056] The 55mm wide strip prepared in this embodiment is in the O state and 0.2mm thick. It is tested according to GB / T16865 "Test specimens and methods for tensile testing of deformed aluminum, magnesium and their alloy products". The tensile strength is 110MPa, the yield strength is 62MPa, and the elongation after fracture is 49%, which is 22.5% higher than that of 8014 aluminum alloy strip at room temperature. The recrystallized grain size in the strip structure is relatively small (such as Figure 1 The stamping blasting value is increased by more than 17% compared with 8014 aluminum alloy strip.

[0057] Table 1 0.2mm thickness strip performance comparison

[0058]

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for manufacturing a novel aluminum alloy strip for battery protection, characterized in that It proceeds as follows:

1. Blank preparation: The blank composition is as follows: Fe: 1.0% to 1.6%, Mn: 0.2% to 0.6%, Ti: 0.01% to 0.1%, V: 0.03% to 0.15% and the balance Al; raw materials are weighed according to the blank composition and then smelted; and a semi-continuous casting method is used to prepare a square ingot blank; 2. Heating and rolling: The square ingot was placed in a resistance heating furnace for heating, and then rolled on a two-roll hot rolling mill at room temperature to obtain a thin plate with a thickness of 0.2 mm.

3. Annealing and slitting: The 0.2 mm thick sheet is placed in an air cushion heating furnace and heated at 400°C for 60-90 seconds to obtain an annealed sheet. After cleaning, it is cut into strips with a width of 50-60 mm, thus completing the production of the new battery protection aluminum alloy strip. The size of the ingot in step 1 is: thickness 500mm, width 1200mm; The heating in step 2 is as follows: heating at 600°C for 5 to 20 hours, then cooling at a rate of 10 to 50°C / h to 450 to 500°C, and then heating for another 5 to 20 hours; The room temperature rolling in step 2: rolling the steel sheet to a thickness of 5 mm on a two-roll hot rolling mill through 10 to 20 passes at room temperature, and then rolling the steel sheet to a thickness of 0.2 mm on a two-roll cold rolling mill through 2 to 5 passes after coiling. The operating speed of the air cushion heating furnace in step 3 is 20-30 m / s; The slitting described in step 3 is performed using a precision shearing machine.

2. The method for manufacturing a novel aluminum alloy strip for battery protection according to claim 1, characterized in that In step 1, the composition of the blank is as follows: Fe: 1.5%, Mn: 0.3%, Ti: 0.05%, V: 0.1% and the balance Al in terms of mass percentage.

3. The method for manufacturing a novel aluminum alloy strip for battery protection according to claim 1, characterized in that In step 1, the composition of the blank is as follows: Fe: 1.4%, Mn: 0.4%, Ti: 0.05%, V: 0.12% and the balance Al in terms of mass percentage.

4. The method for manufacturing a novel aluminum alloy strip for battery protection according to claim 1, characterized in that The heating in step 2 was as follows: heating at 600°C for 10 h, then cooling to 480°C at a rate of 20°C / h, and heating for another 10 h.

5. The method for manufacturing a novel aluminum alloy strip for battery protection according to claim 1, characterized in that The room temperature rolling in step 2 is as follows: at room temperature, the steel sheet is rolled on a two-roll hot rolling mill through 15 passes to a thickness of 5 mm, and then, after coiling, is continuously rolled on a two-roll cold rolling mill at room temperature and rolled through 4 passes to a thickness of 0.2 mm.

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