Preparation method of aluminum alloy profile for new energy automobile battery

Abstract

The application discloses a preparation method of an aluminum alloy profile for a new energy automobile battery, and relates to the technical field of aluminum alloy materials.The alloy components are prepared according to mass percentages, and the alloy components include Si 0.87-1.02%, Mg 0.2-0.7%, Mn 0.15-0.2%, Fe 0.3-0.6%, Ti 0.03-0.04%, Ce 0.1-0.5%, Sr 0.01-0.03%, Sb 0.1-0.3%, V 0.015-0.07wt%, copper-coated mica powder 3-6% and the balance of Al; the copper-coated mica powder is added into a melt in batches, and potassium fluoroborate is added in a smelting process to perform secondary refining; after ultrasonic treatment, the following steps are sequentially performed: casting, homogenization treatment, extrusion forming, annealing treatment and aging treatment.The aluminum alloy profile prepared by the application has high strength, high fracture toughness and excellent impact resistance, can effectively resist collision deformation and prevent battery short circuit.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy materials technology, specifically to a method for preparing aluminum alloy profiles for new energy vehicle batteries. Background Technology

[0002] New energy vehicles place extremely high demands on the performance of battery packs and their structural components, especially requiring lightweight design, high strength, excellent impact resistance, and good heat dissipation. Aluminum alloys, due to their high specific strength and good machinability, are widely used in the manufacture of battery casings, trays, and cooling plates for new energy vehicles. Among these, Al-Si aluminum alloys are a common choice due to their good fluidity and excellent casting properties.

[0003] However, existing aluminum alloy profiles used in new energy vehicle batteries still have some technical defects. First, traditional Al-Si alloys often contain coarse primary silicon and needle-like iron phases. These brittle phases are prone to becoming crack initiation points under stress, resulting in insufficient tensile strength, fracture toughness, and impact absorption capacity of the material. This makes it difficult to meet the stringent requirements for the structural integrity of the battery pack under complex collision conditions and cannot effectively prevent the risk of battery short circuits caused by extrusion deformation.

[0004] Secondly, conventional refining or modification methods are relatively limited and have limited effects on refining the as-cast microstructure. They also struggle to fully coordinate and control the morphology and distribution of various intermetallic compounds, thus failing to fully realize the material's strengthening potential. Furthermore, solid particles (such as mica powder) added to improve the self-lubrication or wear resistance of aluminum alloys often have poor wettability with molten aluminum, easily leading to agglomeration, floating, or segregation. This not only affects their uniform dispersion in the matrix but may also exacerbate wear on equipment during smelting, ultimately reducing the mechanical properties and quality stability of the profiles. However, directly adding mica powder causes it to decompose at high smelting temperatures, generating hard oxides such as Al2O3, severely impairing the alloy's toughness. Therefore, the current technology lacks practical feasibility for using mica powder as a lubricant in cast aluminum alloys. Therefore, developing an aluminum alloy profile for new energy vehicle batteries that combines high strength, high toughness, good impact resistance, and a uniform and stable microstructure has significant practical application value. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing aluminum alloy profiles for new energy vehicle batteries, so as to solve the problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an aluminum alloy profile for new energy vehicle batteries, comprising the following alloy composition by mass percentage: Si 0.87-1.02wt%, Mg 0.2-0.7wt%, Mn 0.15-0.2wt%, Fe 0.3-0.6wt%, Ti 0.03-0.04wt%, Ce 0.1-0.5wt%, Sr 0.01-0.03wt%, V 0.015-0.07wt%, Sb 0.1-0.3wt%, copper-clad mica powder 3-6wt%, with the balance being Al, comprising the following steps: (1) Smelting; (2) Casting; (3) Homogenization treatment; (4) Extrusion molding; (5) Annealing treatment; (6) Time-sensitive processing.

[0007] Further, the specific steps of step (1) are as follows: prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 740-760℃, first melt pure aluminum, industrial silicon and magnesium ingots, hold for 20-30 minutes, then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 710-720℃, add one part of copper-coated mica powder, hold for 10-15 minutes, cool down to 700-710℃, add potassium borofluoride and another part of copper-coated mica powder, press into the bottom of the crucible with a tool to prevent burning on the liquid surface, hold for 30 minutes, and then ultrasonically treat the molten metal to remove the slag.

[0008] Furthermore, the copper-coated mica powder was prepared according to the embodiment of CN115365495B.

[0009] Furthermore, the amount of potassium borofluoride added is 0.2 to 1.8 parts per 100 parts of aluminum alloy.

[0010] Furthermore, the specific steps of step (2) are as follows: the temperature of the aluminum alloy melt obtained in step (1) is reduced to 680-700℃ to prepare for casting. The metal mold gravity casting process is adopted. The casting mold is heated to 210-230℃ in the oven. The aluminum melt is evenly added to each mold with a spoon to form the shape.

[0011] Further, the specific steps of step (3) are as follows: (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment, heated to 550-560℃, kept warm for 7-12 hours, then cooled by strong wind, cooled to 180℃ and then cooled by water mist.

[0012] Furthermore, the specific steps of step (4) are as follows: heating the homogenized aluminum alloy ingot to 485-495°C and heating the extrusion die to 475-485°C for extrusion.

[0013] Furthermore, the extrusion rate is 10-12 m / min, and the extrusion pressure is 120-150 MPa.

[0014] Furthermore, the specific steps of step (5) are as follows: the extruded aluminum alloy profile is annealed at 400~450℃ for 1~2 hours and then naturally cooled to room temperature.

[0015] Furthermore, the specific steps of step (6) are as follows: after the aluminum alloy profile is left to stand for 24-30 hours, it undergoes an aging treatment at a temperature of 175-185℃ for 6-8 hours, and finally cooled to room temperature.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) The present invention adds trace elements Ce, Sr and Sb. The three work together to refine and modify Al-Si and Al-Fe, form a more uniform stress distribution, enhance dispersion strengthening, and thus improve the tensile strength of aluminum alloy profiles, effectively achieving high strength and lightweight effect. At the same time, it improves fracture toughness and impact absorption, thereby resisting deformation during collision and preventing battery short circuit.

[0017] (2) In the melting stage, potassium borofluoride is added as a secondary refining agent to achieve double refining with trace elements, which ensures the full refinement of the as-cast structure and further improves the strength and impact resistance of the aluminum alloy.

[0018] (3) The present invention incorporates copper-coated mica powder. Due to the copper coating on the surface of the mica powder, a solid solution interface is formed between copper and aluminum, which significantly inhibits the decomposition reaction of mica during smelting. It also increases the wettability of mica powder with liquid aluminum alloy, thereby reducing the tendency for it to aggregate and float to become slag. The copper coating provides a thermal buffer, protecting the internal mica and ensuring its stable existence. At the same time, the copper-coated mica powder is added in batches in small amounts, which helps to disperse it more evenly throughout the melt. The wear resistance is improved through the dispersion strengthening of the hard phase. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 An aluminum alloy profile for new energy vehicle batteries has the following alloy composition by mass percentage: Si 0.87wt%, Mg 0.7wt%, Mn 0.15wt%, Fe 0.3wt%, Ti 0.03wt%, Ce 0.1wt%, Sr 0.01wt%, Sb 0.1wt%, copper-coated mica powder 3wt%, V 0.015wt%, with the balance being Al; the specific preparation steps are as follows: (1) Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 740°C, melt pure aluminum, industrial silicon and magnesium ingots first, keep warm for 20 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 715°C, add one part of copper-coated mica powder, keep warm for 10 minutes, and then cool down to 700°C. Add 0.2 parts of potassium borofluoride and one part of copper-coated mica powder for every 100 parts of aluminum alloy. Press it into the bottom of the crucible with a tool to prevent it from burning on the liquid surface. Keep warm for 30 minutes, and then ultrasonically treat the molten metal to remove the slag. The temperature drops to 680°C to prepare for casting. Use the metal mold gravity casting process. Heat the casting mold to 210°C in the oven and use a spoon to evenly add the aluminum liquid into each mold to form the shape. (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 550℃ and the temperature is held for 7 hours. Then it is cooled by strong wind and cooled to 180℃ before being cooled by water mist. (3) Heat the homogenized aluminum alloy ingot to 485°C and the extrusion die to 475°C for extrusion. The extrusion rate is 10 m / min and the extrusion pressure is 120 MPa. (4) Anneal the extruded aluminum alloy profile at 400℃ for 1 hour, and then let it cool naturally to room temperature. (5) After the aluminum alloy profiles are left to stand for 24 hours, they are subjected to aging treatment at a temperature of 175°C for 6 hours, and then cooled to room temperature.

[0021] Example 2 An aluminum alloy profile for new energy vehicle batteries has the following alloy composition by mass percentage: Si 1.02wt%, Mg 0.2wt%, Mn 0.2wt%, Fe 0.6wt%, Ti 0.04wt%, Ce 0.5wt%, Sr 0.03wt%, Sb 0.3wt%, copper-coated mica powder 6wt%, V 0.02wt%, with the balance being Al; the specific preparation steps are as follows: (1) Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 760°C, melt pure aluminum, industrial silicon and magnesium ingots first, keep warm for 30 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 710°C, add one part of copper-coated mica powder, keep warm for 15 minutes, and then cool down to 700°C. Add 1.8 parts of potassium borofluoride and one part of copper-coated mica powder for every 100 parts of aluminum alloy. Press the mixture into the bottom of the crucible with a tool to prevent it from burning on the liquid surface. Keep warm for 30 minutes, then ultrasonically treat the molten metal to remove the slag. Cool down to 700°C to prepare for casting. Use the metal mold gravity casting process. Heat the casting mold to 230°C in the oven and use a spoon to evenly add the aluminum liquid into each mold for forming. (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 560℃ and the temperature is held for 12 hours. Then it is cooled by strong wind and cooled to 180℃ before being cooled by water mist. (3) Heat the homogenized aluminum alloy ingot to 495°C and the extrusion die to 485°C for extrusion. The extrusion rate is 12 m / min and the extrusion pressure is 150 MPa. (4) Anneal the extruded aluminum alloy profile at 450℃ for 2 hours, and then let it cool naturally to room temperature. (5) After the aluminum alloy profiles are left to stand for 30 hours, they are subjected to aging treatment at a temperature of 185°C for 8 hours, and then cooled to room temperature.

[0022] Example 3 An aluminum alloy profile for new energy vehicle batteries has the following alloy composition by mass percentage: Si 0.92wt%, Mg 0.4wt%, Mn 0.18wt%, Fe 0.45wt%, Ti 0.035wt%, Ce 0.3wt%, Sr 0.02wt%, Sb 0.2wt%, copper-coated mica powder 4.5wt%, V 0.03wt%, with the balance being Al. The specific preparation steps are as follows: (1) Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 750°C, melt pure aluminum, industrial silicon and magnesium ingots first, keep warm for 25 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 715°C, add one part of copper-coated mica powder, keep warm for 13 minutes, and then cool down to 710°C. Add 1.0 part of potassium borofluoride and one part of copper-coated mica powder for every 100 parts of aluminum alloy. Press it into the bottom of the crucible with a tool to prevent it from burning on the liquid surface. Keep warm for 30 minutes, and then ultrasonically treat the molten metal to remove the slag. The temperature drops to 690°C to prepare for casting. Use the metal mold gravity casting process. Heat the casting mold to 220°C in the oven and use a spoon to evenly add the aluminum liquid into each mold to form the shape. (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 555℃ and the temperature is held for 10 hours. Then it is cooled by strong wind and cooled to 180℃ before being cooled by water mist. (3) Heat the homogenized aluminum alloy ingot to 490°C and the extrusion die to 480°C for extrusion. The extrusion rate is 11 m / min and the extrusion pressure is 135 MPa. (4) Anneal the extruded aluminum alloy profile at 425℃ for 1.5h, and then let it cool naturally to room temperature. (5) After the aluminum alloy profiles are left to stand for 27 hours, they are subjected to aging treatment at a temperature of 180°C for 7 hours, and then cooled to room temperature.

[0023] Example 4 An aluminum alloy profile for new energy vehicle batteries has the following alloy composition by mass percentage: Si 1.02wt%, Mg 0.5wt%, Mn 0.15wt%, Fe 0.3wt%, Ti 0.04wt%, Ce 0.1wt%, Sr 0.03wt%, Sb 0.3wt%, copper-coated mica powder 5.2wt%, V 0.05wt%, with the balance being Al. The specific preparation steps are as follows: (1) Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 755℃, melt pure aluminum, industrial silicon and magnesium ingots first, keep the temperature for 22 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 715℃, add one part of copper-coated mica powder, keep the temperature for 11 minutes, and then cool down to 705℃. Add 0.5 parts of potassium borofluoride and one part of copper-coated mica powder for every 100 parts of aluminum alloy. Press the mixture into the bottom of the crucible with a tool to prevent it from burning on the liquid surface. Keep the temperature for 30 minutes, and then ultrasonically treat the molten metal to remove the slag. The temperature drops to 685℃ to prepare for casting. Use the metal mold gravity casting process. Heat the casting mold to 215℃ in the oven and use a spoon to evenly add the aluminum liquid into each mold to form the shape. (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 552℃ and the temperature is held for 8 hours. Then it is cooled by strong wind and cooled to 180℃ before being cooled by water mist. (3) Heat the homogenized aluminum alloy ingot to 488°C and the extrusion die to 478°C for extrusion. The extrusion rate is 10.5 m / min and the extrusion pressure is 125 MPa. (4) Anneal the extruded aluminum alloy profile at 410℃ for 1.2h, and then let it cool naturally to room temperature. (5) After the aluminum alloy profiles are left to stand for 25 hours, they are subjected to aging treatment at a temperature of 177°C for 6.5 hours, and then cooled to room temperature.

[0024] Example 5 An aluminum alloy profile for new energy vehicle batteries has the following alloy composition by mass percentage: Si 0.90wt%, Mg 0.6wt%, Mn 0.2wt%, Fe 0.6wt%, Ti 0.03wt%, Ce 0.5wt%, Sr 0.01wt%, Sb 0.1wt%, copper-coated mica powder 3.8wt%, V 0.06wt%, with the balance being Al; the specific preparation steps are as follows: (1) Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 745°C, melt pure aluminum, industrial silicon and magnesium ingots first, keep warm for 28 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 710°C, add one part of copper-coated mica powder, keep warm for 14 minutes, and then cool down to 705°C. Add 1.5 parts of potassium borofluoride and one part of copper-coated mica powder for every 100 parts of aluminum alloy. Press the mixture into the bottom of the crucible with a tool to prevent it from burning on the liquid surface. Keep warm for 30 minutes, and then ultrasonically treat the molten metal to remove the slag. Cool down to 695°C to prepare for casting. Use the metal mold gravity casting process. Heat the casting mold to 225°C in the oven and use a spoon to evenly add the aluminum liquid into each mold for forming. (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 558℃ and the temperature is held for 11 hours. Then it is cooled by strong air and cooled to 180℃ before being cooled by water mist. (3) Heat the homogenized aluminum alloy ingot to 492°C and the extrusion die to 482°C for extrusion. The extrusion rate is 11.5 m / min and the extrusion pressure is 145 MPa. (4) Anneal the extruded aluminum alloy profile at 440℃ for 1.8h, and then let it cool naturally to room temperature. (5) After the aluminum alloy profiles are left to stand for 29 hours, they are subjected to aging treatment at a temperature of 183°C for 7.5 hours, and then cooled to room temperature.

[0025] Example 6 An aluminum alloy profile for new energy vehicle batteries has the following alloy composition by mass percentage: Si 0.98wt%, Mg 0.3wt%, Mn 0.17wt%, Fe 0.4wt%, Ti 0.035wt%, Ce 0.2wt%, Sr 0.025wt%, Sb 0.25wt%, copper-coated mica powder 5.0wt%, V 0.07wt%, with the balance being Al. The specific preparation steps are as follows: (1) Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 755℃, melt pure aluminum, industrial silicon and magnesium ingots first, keep the temperature for 25 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 710℃, add one part of copper-coated mica powder, keep the temperature for 12 minutes, and then cool down to 700℃. Add 1.2 parts of potassium borofluoride and one part of copper-coated mica powder for every 100 parts of aluminum alloy. Press the powder into the bottom of the crucible with a tool to prevent it from burning on the liquid surface. Keep the temperature for 30 minutes, and then ultrasonically treat the molten metal to remove the slag. The temperature drops to 690℃ to prepare for casting. Use the metal mold gravity casting process. Heat the casting mold to 220℃ in the oven and use a spoon to evenly add the aluminum liquid into each mold to form the shape. (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 555℃ and the temperature is held for 9 hours. Then it is cooled by strong wind and cooled to 180℃ before being cooled by water mist. (3) Heat the homogenized aluminum alloy ingot to 490°C and the extrusion die to 480°C for extrusion. The extrusion rate is 11 m / min and the extrusion pressure is 140 MPa. (4) Anneal the extruded aluminum alloy profile at 430℃ for 1.5h, and then let it cool naturally to room temperature. (5) After the aluminum alloy profiles are left to stand for 26 hours, they are subjected to aging treatment at a temperature of 182°C for 7.2 hours, and then cooled to room temperature.

[0026] Example 7 An aluminum alloy profile for new energy vehicle batteries has the following alloy composition by mass percentage: Si 0.95wt%, Mg 0.5wt%, Mn 0.19wt%, Fe 0.55wt%, Ti 0.036wt%, Ce 0.4wt%, Sr 0.028wt%, Sb 0.15wt%, copper-coated mica powder 4.0wt%, V 0.03wt%, with the balance being Al; the specific preparation steps are as follows: (1) Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 745°C, melt pure aluminum, industrial silicon and magnesium ingots first, keep warm for 23 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 710°C, add one part of copper-coated mica powder, keep warm for 14 minutes, and then cool down to 700°C. Add 0.8 parts of potassium borofluoride and one part of copper-coated mica powder for every 100 parts of aluminum alloy. Press the mixture into the bottom of the crucible with a tool to prevent it from burning on the liquid surface. Keep warm for 30 minutes, and then ultrasonically treat the molten metal to remove the slag. The temperature drops to 692°C to prepare for casting. Use the metal mold gravity casting process. Heat the casting mold to 218°C in the oven and use a spoon to evenly add the aluminum liquid into each mold for forming. (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 553℃ and the temperature is held for 8.5h. Then it is cooled by strong wind and cooled to 180℃ and then cooled by water mist. (3) The aluminum alloy ingot after homogenization treatment is heated to 487°C and the extrusion die is heated to 477°C for extrusion. The extrusion rate is 10.8 m / min and the extrusion pressure is 128 MPa. (4) Anneal the extruded aluminum alloy profile at 405℃ for 1.3h, and then let it cool naturally to room temperature. (5) After the aluminum alloy profiles are left to stand for 28 hours, they are subjected to aging treatment at a temperature of 178°C for 6.8 hours, and then cooled to room temperature.

[0027] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that Al-Ce master alloy is not added, while the other preparation steps are the same as in Example 3.

[0028] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that no Al-Sr master alloy is added, while the rest of the preparation steps are the same as in Example 3.

[0029] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that Al-Sb master alloy is not added, while the rest of the preparation steps are the same as in Example 3.

[0030] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that Al-Sb master alloy and Al-Sr master alloy are not added, while the other preparation steps are the same as in Example 3.

[0031] Comparative Example 5 The difference between Comparative Example 5 and Example 3 is that Al-Sb master alloy and Al-Ce master alloy are not added, while the other preparation steps are the same as in Example 3.

[0032] Comparative Example 6 The difference between Comparative Example 6 and Example 3 is that Al-Sr master alloy and Al-Ce master alloy are not added, while the other preparation steps are the same as in Example 3.

[0033] Comparative Example 7 The difference between Comparative Example 7 and Example 3 is that copper-coated mica powder is not added, while the rest of the preparation steps are the same as in Example 3.

[0034] Comparative Example 8 The difference between Comparative Example 8 and Example 3 lies in the preparation method of step (1). Step (1) is changed to: prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 750°C, melt pure aluminum, industrial silicon and magnesium ingots first, keep them at the temperature for 25 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 710°C, add 1.0 part of potassium borofluoride per 100 parts of aluminum alloy, press it into the bottom of the crucible with a tool to prevent it from burning on the liquid surface, keep it at the temperature for 30 minutes, and then ultrasonically treat the molten metal to remove the slag. The temperature is reduced to 690°C to prepare for casting. The metal mold gravity casting process is adopted. The casting mold is heated to 220°C in the oven. The aluminum liquid is evenly added into each mold with a spoon to form the shape. The rest of the preparation steps are the same as in Example 3.

[0035] Comparative Example 9 The difference between Comparative Example 9 and Example 3 is that mica powder is used instead of copper-coated mica powder, while the other preparation steps are the same as in Example 3.

[0036] Comparative Example 10 The difference between Comparative Example 10 and Example 3 is that potassium borofluoride is not added, while the rest of the preparation steps are the same as in Example 3.

[0037] Example of effect Table 1 below shows the performance analysis results of Examples 1 to 7 and Comparative Examples 1 to 12 of the present invention.

[0038] Table 1 It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. An aluminum alloy profile for new energy vehicle batteries, comprising the following alloy composition by mass percentage: Si 0.87-1.02wt%, Mg 0.2-0.7wt%, Mn 0.15-0.2wt%, Fe 0.3-0.6wt%, Ti 0.03-0.04wt%, Ce 0.1-0.5wt%, Sr 0.01-0.03wt%, Sb 0.1-0.3wt%, copper-clad mica powder 3-6wt%, V 0.015-0.07wt%, with the balance being Al, characterized in that, Includes the following steps: (1) Smelting; (2) Casting; (3) Homogenization treatment; (4) Extrusion molding; (5) Annealing treatment; (6) Time-sensitive processing.

2. The aluminum alloy profile for new energy vehicle batteries according to claim 1, characterized in that, The specific steps of step (1) are as follows: Prepare materials according to the alloy composition ratio and divide the copper-coated mica powder into two equal parts. Heat to 740-760℃, melt pure aluminum, industrial silicon and magnesium ingots first, keep them at the temperature for 20-30 minutes, and then add Al-V master alloy, Al-Mn master alloy, Al-Ti master alloy, Al-Sr master alloy, Al-Ce master alloy, Al-Fe master alloy and Al-Sb master alloy respectively for melting. After melting, cool down to 710-720℃, add one part of copper-coated mica powder, keep it at the temperature for 10-15 minutes, cool down to 700-710℃, add potassium borofluoride and add another part of copper-coated mica powder, press it into the bottom of the crucible with a tool to prevent it from burning on the liquid surface, keep it at the temperature for 30 minutes, and then ultrasonically treat the molten metal to remove the slag.

3. The aluminum alloy profile for new energy vehicle batteries according to claim 2, characterized in that, The amount of potassium borofluoride added is 0.2 to 1.8 parts per 100 parts of aluminum alloy.

4. The aluminum alloy profile for new energy vehicle batteries according to claim 1, characterized in that, The specific steps of step (2) are as follows: the temperature of the aluminum alloy melt obtained in step (1) is reduced to 680-700℃ to prepare for casting. The metal mold gravity casting process is adopted. The casting mold is heated to 210-230℃ in the oven. The aluminum melt is evenly added to each mold with a spoon to form the shape.

5. The aluminum alloy profile for new energy vehicle batteries according to claim 1, characterized in that, The specific steps of step (3) are as follows: (2) The cast aluminum alloy ingot is placed in a homogenization furnace for homogenization treatment. The heating temperature is 550-560℃, and the temperature is kept for 7-12 hours. Then, it is cooled by strong wind and cooled to 180℃ before being cooled by water mist.

6. The aluminum alloy profile for new energy vehicle batteries according to claim 1, characterized in that, The specific steps of step (4) are as follows: heat the homogenized aluminum alloy ingot to 485-495℃, heat the extrusion die to 475-485℃, and extrude it.

7. The aluminum alloy profile for new energy vehicle batteries according to claim 6, characterized in that, The extrusion rate is 10-12 m / min, and the extrusion pressure is 120-150 MPa.

8. The aluminum alloy profile for new energy vehicle batteries according to claim 1, characterized in that, The specific steps of step (5) are as follows: the extruded aluminum alloy profile is annealed at 400~450℃ for 1~2 hours and then naturally cooled to room temperature.

9. The aluminum alloy profile for new energy vehicle batteries according to claim 1, characterized in that, The specific steps of step (6) are as follows: after the aluminum alloy profile is left to stand for 24-30 hours, it is subjected to aging treatment at a temperature of 175-185℃ for 6-8 hours, and finally cooled to room temperature.

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