New energy automobile battery tray aluminum alloy profile and preparation method thereof

Abstract

The invention discloses a new energy automobile battery tray aluminum alloy profile and a preparation method thereof.The new energy automobile battery tray aluminum alloy profile comprises, by mass, 0.5 wt%-0.8 wt% of Mg, 0.4 wt%-0.6 wt% of Si, 0.1 wt%-0.35 wt% of Fe, 0.01 wt%-0.08 wt% of Ti, 0.01 wt%-0.09 wt% of Sc, smaller than or equal to 0.1 wt% of Mn, smaller than or equal to 0.1 wt% of Cu, smaller than or equal to 0.1 wt% of Zn, smaller than or equal to 0.15 wt% of the total amount of impurities and the balance Al. According to the new energy automobile battery tray aluminum alloy profile and the preparation method thereof, the mechanical property and the extrusion precision of the aluminum profile are effectively improved by adopting a newly designed alloy formula and matching with a specific production process, and the problems that the section of a new energy automobile battery tray is wide and large, and the extrusion precision of a special-shaped cavity structure is reduced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy profiles for battery trays of new energy vehicles, and in particular to an aluminum alloy profile for battery trays of new energy vehicles and a preparation method thereof. Background Art

[0002] As the core component of electric vehicles, the performance and safety of batteries are directly related to the operation and safety of the entire vehicle. Therefore, as a key component for carrying and protecting batteries, the research and development technology of battery aluminum trays is particularly important.

[0003] At present, most traditional battery trays on the market are steel structures. Although they have strong load-bearing capacity, they are heavy, costly, and prone to corrosion, making it difficult to meet the needs of lightweight, high-efficiency, and long life for new energy commercial electric vehicles. Aluminum alloy materials have gradually become a new choice for the development of battery trays due to their excellent properties such as light weight, high strength, and corrosion resistance. However, there are still many challenges in the research and development technology of aluminum alloy battery trays. The aluminum alloy profiles of new energy vehicle battery trays are larger than those of ordinary new energy vehicles, and the profile cross-section is wide. They often use a structure that alternates between the cavity and the solid. The extrusion accuracy of the special-shaped cavity structure is poor. The finished product yield of heavy truck battery tray profiles produced using conventional alloy manufacturing processes is low and the quality is unstable. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an aluminum alloy profile for a battery tray of a new energy vehicle, in which the mechanical strength, welding performance, hardness and mechanical properties at all locations are kept consistent.

[0005] The technical problem to be solved by the present invention is also to provide a method for preparing an aluminum alloy profile for a battery tray of a new energy vehicle, wherein the mechanical strength, welding performance, hardness and mechanical properties of the prepared aluminum alloy profile remain consistent.

[0006] In order to solve the above problems, the present invention provides a new energy vehicle battery tray aluminum alloy profile, which includes the following components in mass percentage: Mg 0.5wt%~0.8wt%, Si 0.4wt%~0.6wt%, Fe0.1wt%~0.35wt%, Ti 0.01wt%~0.08wt%, Sc 0.01wt%~0.09wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0007] In order to solve the above problems, the present invention provides a method for preparing an aluminum alloy profile for a battery tray of a new energy vehicle, comprising the following steps:

[0008] Provide aluminum ingots;

[0009] Smelting the aluminum ingot to obtain aluminum liquid;

[0010] Adding alloy components to the aluminum liquid to meet a preset formula to obtain a first aluminum liquid;

[0011] The first aluminum liquid is subjected to refining treatment and static treatment to obtain a melt;

[0012] The melt is subjected to casting treatment to obtain an ingot;

[0013] The ingot is homogenized, extruded, quenched and aged to obtain a finished product;

[0014] The preset formula includes the following components in terms of mass percentage: Mg 0.5wt%-0.8wt%, Si 0.4wt%-0.6wt%, Fe 0.1wt%-0.35wt%, Ti 0.01wt%-0.08wt%, Sc 0.01wt%-0.09wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0015] In one embodiment, the refining process includes: adding a refining accelerator to the second aluminum liquid for refining at 730° C. to 745° C.;

[0016] The refining time is 25min to 30min.

[0017] In one embodiment, the refining accelerator comprises the following components in terms of mass percentage: KCl 35-39%, NaCl 25-31%, Na3AlF6 11-24%, Na2SO4 7-13%, CaCO3 4-10%.

[0018] In one embodiment, the refining accelerator is added in an amount of 0.1 wt% to 0.15 wt%.

[0019] In one embodiment, the standing temperature of the standing treatment is 720° C. to 740° C., and the standing time is 30 min to 40 min.

[0020] In one embodiment, the casting temperature of the casting process is 690°C to 720°C;

[0021] During the casting process, aluminum titanium boron wire containing Sc is added;

[0022] The added amount of the Sc-containing aluminum titanium boron wire is 0.01wt% to 0.1wt%.

[0023] In one embodiment, the temperature of the homogenization treatment is 545° C. to 555° C., and the holding time is 10 h to 12 h.

[0024] In one embodiment, the extrusion temperature is 515° C. to 525° C., and the extrusion speed is 6 mm / min to 13 mm / min.

[0025] In one embodiment, the aging treatment temperature is 180° C. to 190° C., and the holding time is 7 h to 9 h.

[0026] The implementation of the present invention has the following beneficial effects:

[0027] The aluminum alloy profile for a battery tray for a new energy vehicle provided by the present invention and the preparation method thereof effectively improve the mechanical properties and extrusion precision of the aluminum material by adopting a newly designed alloy formula in combination with a specific production process. The mechanical strength, welding performance, hardness and mechanical properties of the aluminum alloy profile obtained thereby are kept consistent, thus solving the problem that the cross-section of the battery tray for a new energy vehicle is wide and the extrusion precision of the special-shaped cavity structure is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a process flow chart of a method for preparing aluminum alloy profiles for battery trays of new energy vehicles. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The present invention provides a new energy vehicle battery tray aluminum alloy profile, which includes the following components in mass percentage: Mg 0.5wt%-0.8wt%, Si 0.4wt%-0.6wt%, Fe 0.1wt%-0.35wt%, Ti 0.01wt%-0.08wt%, Sc 0.01wt%-0.09wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0031] The present invention is optimized on the basis of 6 series AL-MgSi alloy to obtain an aluminum alloy profile with appropriate strength and good extrusion precision.

[0032] The magnesium element is used to improve the strength and hardness of the alloy, and silicon forms a Mg2Si phase with magnesium to further enhance the strength of the alloy. Preferably, the Mg component is 0.6wt% to 0.7wt%, and the Si component is 0.45wt% to 0.55wt%.

[0033] Iron exists as an impurity element, and its content should be controlled at a relatively low level. Preferably, the Fe component is 0.15 wt% to 0.25 wt%.

[0034] Titanium can refine grains and control recrystallization structure, which helps to improve the extrusion accuracy of the finished product. Preferably, the Ti component is 0.02wt% to 0.07wt%.

[0035] The present invention creatively adds Sc element to the formula, which can not only refine the grains, but also improve the strength and extrusion accuracy of the aluminum alloy, form dispersed particles in the aluminum alloy, and effectively improve the extrusion toughness of the aluminum alloy. Preferably, the Sc component is 0.02wt% to 0.08wt%.

[0036] The addition of manganese can neutralize the harmful effects of iron and improve the mechanical properties of the alloy. Preferably, Mn≤0.05wt%.

[0037] Adding a small amount of copper can improve the strength of the alloy, but it will also reduce its corrosion resistance. Preferably, Cu≤0.05wt%.

[0038] Zinc can increase the fluidity of aluminum alloys and help improve the extrusion properties of the alloys. Preferably, Zn≤0.05wt%.

[0039] Accordingly, if Figure 1 As shown, the present invention provides a method for preparing an aluminum alloy profile for a battery tray of a new energy vehicle, comprising the following steps:

[0040] S1. Provide aluminum ingots;

[0041] The ingredients are 100% aluminum ingots with a purity of 99.80%.

[0042] S2, smelting the aluminum ingot to obtain aluminum liquid;

[0043] In one embodiment, the furnace is heated to a measured furnace temperature ≥ 710°C and then continuously baked for 1-2 hours to evaporate the water molecules in the furnace. The aluminum ingots are then evenly distributed into the furnace and neatly arranged. After the furnace door is closed, the furnace is heated to 730-750°C for smelting to convert solid aluminum into liquid aluminum.

[0044] Preferably, a refining slag remover is placed in the 720-750°C liquid aluminum, and high-purity argon inert gas is continuously introduced into the middle and lower parts of the liquid aluminum in the furnace to remove slag and slag, and the ventilation pressure is controlled according to the rolling height of the aluminum liquid ≤30cm, and the process lasts for 30 to 40 minutes. The present invention does not limit the refining slag remover, and it is a commercially available slag remover.

[0045] S3, adding alloy components to the aluminum liquid to meet a preset formula to obtain a first aluminum liquid;

[0046] The preset formula includes the following components in terms of mass percentage: Mg 0.5wt%-0.8wt%, Si 0.4wt%-0.6wt%, Fe 0.1wt%-0.35wt%, Ti 0.01wt%-0.08wt%, Sc 0.01wt%-0.09wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0047] The first aluminum liquid is sampled and tested. When sampling, aluminum liquids from no less than three zones in the smelting furnace should be tested and averaged for comparison. The intermediate alloy components added in proportion according to the test meet the design value and are qualified.

[0048] S4, the first aluminum liquid is subjected to refining treatment and static treatment to obtain a melt;

[0049] In one embodiment, the refining treatment includes: adding a refining promoter to the second aluminum liquid at 730°C to 745°C for refining; the refining time is 25min to 30min. In one embodiment, the refining promoter includes the following components in terms of mass percentage: KCl 35-39%, NaCl 25-31%, Na3AlF6 11-24%, Na2SO4 7-13%, and CaCO3 4-10%. NaCl and KCl can spread well on the surface of the melt, break and adsorb the oxide film on the surface of the melt, thereby improving the refining effect. Na3AlF6 can adsorb and dissolve aluminum oxides and react with the melt to form gaseous fluorides. These gaseous fluorides can separate the aluminum oxide film from the aluminum melt through mechanical action, thereby improving the refining effect. Na2SO4 can reduce the melting point of the melt, increase the fluidity of the melt, and react with the oxides therein to form soluble sulfates, thereby removing the oxides from the melt. CaCO3 can reduce the content of harmful elements such as sulfur and phosphorus in the melt during the refining process. In one embodiment, the amount of the refining accelerator added is 0.1wt% to 0.15wt%. The addition of the refining accelerator helps to accelerate the homogenization of the melt composition and the good promotion of the liquid structure. After the refining treatment, the sample is taken again for testing to confirm that the composition meets the design standards, and then enters the static state. In one embodiment, the static temperature of the static treatment is 720℃ to 740℃, and the static time is 30min to 40min.

[0050] S5, the melt is cast to obtain an ingot;

[0051] In one embodiment, the casting temperature of the casting process is 690°C to 720°C.

[0052] In one embodiment, Sc-containing aluminum titanium boron wire is added during the casting process; the amount of Sc-containing aluminum titanium boron wire added is 0.01wt% to 0.1wt%. The present invention adds Sc-containing aluminum titanium boron wire during the casting process, which can not only further refine the grains and improve the mechanical properties of the aluminum alloy, but also improve the extrusion toughness and ductility of the aluminum alloy, making it more suitable for preparing heavy truck battery pack trays, and greatly improving the extrusion accuracy of special-shaped cavity structures. Preferably, the amount of Sc-containing aluminum titanium boron wire added is 0.02wt% to 0.08wt%.

[0053] S6, the ingot is homogenized, extruded, quenched and aged to obtain a finished product;

[0054] In one embodiment, the temperature of the homogenization treatment is 545° C. to 555° C., and the holding time is 10 h to 12 h. Under the above homogenization treatment conditions, the aluminum alloy grains can be significantly refined, and the mechanical properties and corrosion resistance can be improved.

[0055] In one embodiment, the extrusion temperature is 515°C to 525°C, and the extrusion speed is 6mm / min to 13mm / min. Extrusion at too high a temperature will result in coarse grains, and its tensile strength and hardness will be reduced; while low-temperature extrusion will aggravate the formation of coarse grain rings, resulting in deterioration of the mechanical properties of the aluminum profile. Preferably, the extrusion temperature is 520°C to 524°C. Excessively fast extrusion speed may cause the material to not have enough time to flow evenly, forming an incomplete or defective profile. Preferably, the extrusion speed is 7mm / min to 12mm / min.

[0056] Aging temperature is an important factor affecting the aging hardening effect of aluminum alloys. At a suitable aging temperature, the precipitation phase in the aluminum alloy can be formed uniformly and stably, thereby improving the strength, hardness and corrosion resistance of the alloy. In one embodiment, the aging treatment temperature is 180°C to 190°C, and the holding time is 7h to 9h.

[0057] The present invention is further described below with reference to specific embodiments.

[0058] Example 1

[0059] This embodiment provides a method for preparing an aluminum alloy profile for a battery tray of a new energy vehicle, comprising the following steps:

[0060] S1. Provide aluminum ingots;

[0061] S2, smelting the aluminum ingot to obtain aluminum liquid;

[0062] S3, adding alloy components to the aluminum liquid to meet a preset formula to obtain a first aluminum liquid;

[0063] The preset formula includes the following components in terms of mass percentage: Mg 0.75wt%, Si 0.55wt%, Fe0.25wt%, Ti 0.07wt%, Sc 0.06wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0064] S4, the first aluminum liquid is subjected to refining treatment and static treatment to obtain a melt;

[0065] The refining treatment includes: adding a refining accelerator to the second aluminum liquid at 735°C for refining; the refining time is 30 minutes. The refining accelerator includes the following components in terms of mass percentage: KCl 36%, NaCl 28%, Na3AlF617%, Na2SO4 11%, CaCO3 8%. The amount of the refining accelerator added is 0.1wt%

[0066] The standing temperature of the standing treatment is 730° C., and the standing time is 35 min.

[0067] S5, the melt is cast to obtain an ingot;

[0068] The casting temperature of the casting process is 710° C., and Sc-containing aluminum titanium boron wire is added during the casting process; the added amount of the Sc-containing aluminum titanium boron wire is 0.05wt%.

[0069] S6, the ingot is homogenized, extruded, quenched and aged to obtain a finished product;

[0070] The temperature of the homogenization treatment is 550°C, and the holding time is 11 hours; the temperature of the extrusion is 520°C, and the extrusion speed is 10 mm / min; the temperature of the aging treatment is 185°C, and the holding time is 8 hours.

[0071] Example 2

[0072] This embodiment provides a method for preparing an aluminum alloy profile for a battery tray of a new energy vehicle, comprising the following steps:

[0073] S1. Provide aluminum ingots;

[0074] S2, smelting the aluminum ingot to obtain aluminum liquid;

[0075] S3, adding alloy components to the aluminum liquid to meet a preset formula to obtain a first aluminum liquid;

[0076] The preset formula includes the following components in terms of mass percentage: Mg 0.6wt%, Si 0.5wt%, Fe0.2wt%, Ti 0.02wt%, Sc 0.03wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0077] S4, the first aluminum liquid is subjected to refining treatment and static treatment to obtain a melt;

[0078] The refining treatment includes: adding a refining accelerator to the second aluminum liquid at 735°C for refining; the refining time is 30 minutes. The refining accelerator includes the following components in terms of mass percentage: KCl 36%, NaCl 28%, Na3AlF617%, Na2SO4 11%, CaCO3 8%. The amount of the refining accelerator added is 0.1wt%

[0079] The standing temperature of the standing treatment is 730° C., and the standing time is 35 min.

[0080] S5, the melt is cast to obtain an ingot;

[0081] The casting temperature of the casting process is 710° C., and Sc-containing aluminum titanium boron wire is added during the casting process; the added amount of the Sc-containing aluminum titanium boron wire is 0.05wt%.

[0082] S6, the ingot is homogenized, extruded, quenched and aged to obtain a finished product;

[0083] The temperature of the homogenization treatment is 550°C, and the holding time is 11 hours; the temperature of the extrusion is 520°C, and the extrusion speed is 10 mm / min; the temperature of the aging treatment is 185°C, and the holding time is 8 hours.

[0084] Example 3

[0085] This embodiment provides a method for preparing an aluminum alloy profile for a battery tray of a new energy vehicle, comprising the following steps:

[0086] S1. Provide aluminum ingots;

[0087] S2, smelting the aluminum ingot to obtain aluminum liquid;

[0088] S3, adding alloy components to the aluminum liquid to meet a preset formula to obtain a first aluminum liquid;

[0089] The preset formula includes the following components in terms of mass percentage: Mg 0.66wt%, Si 0.57wt%, Fe0.29wt%, Ti 0.08wt%, Sc 0.09wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

[0090] S4, the first aluminum liquid is subjected to refining treatment and static treatment to obtain a melt;

[0091] The refining treatment includes: adding a refining accelerator to the second aluminum liquid at 735°C for refining; the refining time is 30 minutes. The refining accelerator includes the following components in terms of mass percentage: KCl 36%, NaCl 28%, Na3AlF617%, Na2SO4 11%, CaCO3 8%. The amount of the refining accelerator added is 0.1wt%

[0092] The standing temperature of the standing treatment is 730° C., and the standing time is 35 min.

[0093] S5, the melt is cast to obtain an ingot;

[0094] The casting temperature of the casting process is 710° C., and Sc-containing aluminum titanium boron wire is added during the casting process; the added amount of the Sc-containing aluminum titanium boron wire is 0.05wt%.

[0095] S6, the ingot is homogenized, extruded, quenched and aged to obtain a finished product;

[0096] The temperature of the homogenization treatment is 550°C, and the holding time is 11 hours; the temperature of the extrusion is 520°C, and the extrusion speed is 10 mm / min; the temperature of the aging treatment is 185°C, and the holding time is 8 hours.

[0097] Comparative Example 1

[0098] This comparative example provides a method for preparing an aluminum alloy profile for a battery tray of a new energy vehicle, comprising the following steps:

[0099] S1. Provide aluminum ingots;

[0100] S2, smelting the aluminum ingot to obtain aluminum liquid;

[0101] S3, adding alloy components to the aluminum liquid to meet a preset formula to obtain a first aluminum liquid;

[0102] The preset formula includes the following components in terms of mass percentage: Mg 0.1wt%, Si 0.3wt%, Fe0.1wt%, Ti 0.01wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity content≤0.15wt%, and the balance is Al.

[0103] S4, the first aluminum liquid is subjected to refining treatment and static treatment to obtain a melt;

[0104] The refining treatment includes: adding a refining accelerator to the second aluminum liquid at 735°C for refining; the refining time is 30 minutes. The refining accelerator includes the following components in terms of mass percentage: KCl 36%, NaCl 28%, Na3AlF617%, Na2SO4 11%, CaCO3 8%. The amount of the refining accelerator added is 0.1wt%

[0105] The standing temperature of the standing treatment is 730° C., and the standing time is 35 min.

[0106] S5, the melt is cast to obtain an ingot;

[0107] The casting temperature of the casting process is 710° C., and Sc-containing aluminum titanium boron wire is added during the casting process; the added amount of the Sc-containing aluminum titanium boron wire is 0.05wt%.

[0108] S6, the ingot is homogenized, extruded, quenched and aged to obtain a finished product;

[0109] The temperature of the homogenization treatment is 550°C, and the holding time is 11 hours; the temperature of the extrusion is 520°C, and the extrusion speed is 10 mm / min; the temperature of the aging treatment is 185°C, and the holding time is 8 hours.

[0110] The aluminum alloy profiles of the new energy vehicle battery tray prepared in Examples 1 to 3 and Comparative Example 1 were subjected to mechanical property tests, and then extruded to prepare the battery pack tray. The dimensions of the extruded finished product were measured, and the finished product yield was calculated. The test results are shown in Table 1.

[0111] Table 1 Mechanical properties and finished product yield of aluminum alloy profiles for new energy vehicle battery trays obtained in Examples 1 to 3 and Comparative Example 1

[0112]

[0113]

[0114] In summary, the aluminum alloy profile for the battery tray of new energy vehicles and the preparation method thereof provided by the present invention effectively improve the mechanical properties and extrusion precision of the aluminum material by adopting a newly designed alloy formula and a specific production process, thereby solving the problem that the cross-section of the battery tray of new energy vehicles is wide and the extrusion precision of the special-shaped cavity structure is reduced.

[0115] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A new energy vehicle battery tray aluminum alloy profile, characterized in that: Calculated by mass percentage, it includes the following components: Mg 0.5wt%~0.8wt%, Si 0.4wt%~0.6wt%, Fe 0.1wt%~0.35wt%, Ti 0.01wt%~0.08wt%, Sc 0.01wt%~0.09wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

2. A method for preparing the aluminum alloy profile of the new energy vehicle battery tray as claimed in claim 1, characterized in that: The following steps are involved: Provide aluminum ingots; Smelting the aluminum ingot to obtain aluminum liquid; Adding alloy components to the aluminum liquid to meet a preset formula to obtain a first aluminum liquid; The first aluminum liquid is subjected to refining treatment and static treatment to obtain a melt; The melt is subjected to casting treatment to obtain an ingot; The ingot is homogenized, extruded, quenched and aged to obtain a finished product; The preset formula includes the following components in terms of mass percentage: Mg 0.5wt%-0.8wt%, Si 0.4wt%-0.6wt%, Fe 0.1wt%-0.35wt%, Ti 0.01wt%-0.08wt%, Sc 0.01wt%-0.09wt%, Mn≤0.1wt%, Cu≤0.1wt%, Zn≤0.1wt%, total impurity amount≤0.15wt%, and the balance is Al.

3. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 2, characterized in that: The refining treatment includes: adding a refining accelerator to the second aluminum liquid at 730° C. to 745° C. for refining; The refining time is 25min to 30min.

4. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 3, characterized in that: The refining accelerator comprises the following components in terms of mass percentage: 35-39% of KCl, 25-31% of NaCl, 11-24% of Na3AlF6, 7-13% of Na2SO4 and 4-10% of CaCO3.

5. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 3, characterized in that: The addition amount of the refining accelerator is 0.1wt% to 0.15wt%.

6. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 2, characterized in that: The standing temperature of the standing treatment is 720° C. to 740° C., and the standing time is 30 min to 40 min.

7. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 2, characterized in that: The casting temperature of the casting process is 690°C to 720°C; During the casting process, aluminum titanium boron wire containing Sc is added; The added amount of the Sc-containing aluminum titanium boron wire is 0.01wt% to 0.1wt%.

8. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 2, characterized in that: The temperature of the homogenization treatment is 545°C ~ 555°C, and the insulation time is 10h ~ 12h.

9. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 2, characterized in that: The extrusion temperature is 515° C. to 525° C., and the extrusion speed is 6 mm / min to 13 mm / min.

10. The method for preparing the aluminum alloy profile of the battery tray of the new energy vehicle according to claim 2, characterized in that: The temperature of the aging treatment is 180° C. to 190° C., and the insulation time is 7 h to 9 h.

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