Preparation method of 6101 aluminum alloy composite plate for new energy automobile conductive bar

Abstract

This invention relates to a method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles, addressing the problem that conductive materials for new energy vehicles struggle to simultaneously achieve high conductivity and high strength, and that interfacial bonding is weak. The aluminum alloy composite plate comprises two cladding alloy layers and a core alloy layer disposed between the two cladding alloy layers, with the two cladding alloy layers and the core alloy layer stacked together. The preparation method includes: hot-rolling a composite treatment of an aluminum alloy ingot and a high-conductivity pure aluminum ingot to generate a hot-rolled coil, wherein the outer layer is made of 1070 high-conductivity pure aluminum, and the core layer is made of 6101 aluminum alloy; the hot-rolled coil undergoes a first cold rolling, solution quenching, a first aging, a second cold rolling, a second aging, and straightening and cutting. This invention achieves a synergistic improvement in conductivity and mechanical strength through a three-layer composite structure. The hot-rolling composite process and subsequent heat treatment ensure metallurgical bonding at the interface, resulting in a material with advantages such as strong interfacial bonding, stable process, and suitability for large-scale production.

Description

Technical Field

[0001] This invention belongs to the field of metal materials technology, and in particular relates to a method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, higher requirements have been placed on the materials used in vehicle-mounted high-voltage conductive systems (such as battery connectors and busbars): on the one hand, they need to have excellent conductivity to reduce energy loss; on the other hand, they need to have sufficient mechanical strength to ensure structural safety and assembly reliability. Traditional pure aluminum (such as 1070) has high conductivity (≥62% IACS), but its strength is relatively low (tensile strength is usually <80 MPa), making it difficult to meet the requirements of structural components; while high-strength aluminum alloys (such as 6101) can have a tensile strength of over 200 MPa, but their conductivity is generally only 50-55% IACS, limiting their application in high-conductivity scenarios.

[0003] Chinese Patent Publication No. CN119876793A discloses a high-strength, high-conductivity, and heat-resistant aluminum-based composite material, which is formed by sintering 90-95 wt% of an aluminum alloy matrix and 5-10 wt% of a conductive fiber membrane. The conductive fiber membrane is a polyaniline / polyacrylonitrile composite conductive fiber membrane doped with nano-copper particles and cerium oxide particles. However, this solution does not elucidate the interfacial bonding mechanism between the organic fiber membrane and the metal matrix, nor does it provide methods for matching thermal expansion coefficients, controlling interfacial reactions, or quantitatively evaluating bonding strength, thus posing risks such as interfacial debonding and electromigration failure at high temperatures.

[0004] Chinese Patent Publication No. CN119040871A discloses a method for preparing an aluminum-based conductive coating on the surface of a composite material, employing a low-pressure cold spraying process. Such methods rely on precise control of powder particle size, composition, and spraying parameters, resulting in a narrow process window, poor material performance consistency, and limited bonding strength between the coating and the substrate, making it difficult to meet the requirements of highly reliable conductive components.

[0005] Chinese patent publication CN104773093B discloses a copper-aluminum composite conductive rail and its manufacturing method, which achieves connection by drilling holes in the copper-aluminum composite plate and mechanically fastening it with copper bolts. This structure is complex, has high contact resistance, and is costly, and is not suitable for new energy vehicle applications that require high current density and lightweight design.

[0006] Existing technologies employ methods such as coating, spraying, or mechanical bonding to improve the overall performance of materials. However, these methods have significant limitations: coating is prone to weak interfacial bonding, potentially leading to delamination during long-term use; spraying has poor process stability, making it difficult to guarantee consistent material properties; and mechanical bonding involves complex processes and high production costs. Therefore, there is an urgent need for a novel aluminum alloy composite conductive material that exhibits strong interfacial metallurgical bonding, synergistic improvement in conductivity and strength, stable processing, and suitability for continuous large-scale production. Summary of the Invention

[0007] The present invention addresses the problems existing in the prior art, namely, the technical problem to be solved by the present invention is to provide a method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles, the 6101 aluminum alloy composite plate comprising two cladding alloy layers and a core alloy layer disposed between the two cladding alloy layers, the two cladding alloy layers and the core alloy layer being laminated together; the preparation method includes the following steps: Step S1: Mill and cut the core alloy ingot and cladding alloy ingot respectively to obtain core alloy ingot blanks and cladding alloy ingot blanks with flat surfaces; wherein the core alloy ingot is a 6101 alloy ingot and the cladding alloy ingot is a 1070 alloy ingot. Step S2: Stack the three ingots in the order of “cladding alloy ingot – core alloy ingot – cladding alloy ingot”, and weld the two cladding alloy ingots and the core alloy ingot at the edge to obtain a composite alloy ingot. Step S3: The composite alloy ingot is subjected to homogenization heat treatment, hot rolling, cold rolling once, solution quenching, aging once, cold rolling twice, aging twice, straightening and cutting to finally obtain 6101 aluminum alloy composite plate.

[0009] Furthermore, the core alloy comprises the following components by weight percentage: Si 0.40–0.70%, Fe 0.30–0.50%, Cu 0.1–0.2%, Mn ≤0.03%, Mg 0.4–0.8%, Cr ≤0.03%, Zn ≤0.10%, Ti 0.02–0.03%, with the balance being aluminum and unavoidable impurities.

[0010] Furthermore, the aluminum alloy composite plate has a tensile strength ≥230MPa, a yield strength ≥210MPa, and an electrical conductivity ≥62%IACS.

[0011] Furthermore, the specific steps of step S2 include: grinding the surfaces of the cladding alloy ingot and the core alloy ingot to a surface roughness Ra≤2.0μm, and cleaning the surface of the alloy ingot with anhydrous ethanol to remove oil stains; and using aluminum wire welding to weld the contact surfaces of the cladding alloy ingot and the core alloy ingot in sections.

[0012] Furthermore, the specific steps of step S3 include: Step S31: The composite alloy billet is subjected to homogenization heat treatment at 560℃ for 2 to 4 hours in a vertical pusher furnace. Step S32: Immediately after exiting the furnace, hot rolling is carried out, with the final rolling temperature controlled at 240-290℃, to roll into hot-rolled coils with a thickness of 6-8mm; Step S33: Cold roll the obtained hot-rolled coil to a thickness of 2-5 mm; Step S34: The coil is subjected to solution treatment, quenching and pre-stretching in a continuous air cushion furnace to obtain a supersaturated solution-treated coil. Step S35: Perform an aging treatment by holding the solution-treated aluminum coil at 160-200℃ for 2-6 hours; Step S36: Perform a second cold rolling on the coil after the first aging treatment to obtain a cold-worked aluminum coil; Step S37: The cold-worked aluminum coil is kept at 160-200℃ for 6-12 hours for a second aging treatment; Step S38: The roll material that has undergone secondary aging treatment is straightened and cross-cut into the required specifications to obtain the finished 6101 aluminum alloy composite plate.

[0013] Furthermore, in step S34, the solution temperature is 530–555℃, and the holding time is 30–60s; the quenching treatment uses water quenching, and the cooling rate is ≥50℃ / s.

[0014] Furthermore, in step S36, the secondary cold rolling rate is 15-25%.

[0015] Furthermore, in step S2, the thickness ratio of the cladding alloy ingot, the core alloy ingot, and the cladding alloy ingot is 50:430:50.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed, and the 6101 aluminum alloy composite plate prepared has both high conductivity and high strength, and the interface is firmly bonded, overcoming the defects of the prior art such as single material properties, poor interface bonding and complex process. Attached Figure Description

[0017] Figure 1 The core and cladding alloy ingots before hot rolling; Figure 2 This is a metallographic cross-sectional image of a 6101 aluminum alloy composite plate. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] This invention discloses a method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles. Addressing the problem that conductive materials for new energy vehicles often suffer from a lack of both high conductivity and high strength, and that interfacial bonding is weak, the 6101 aluminum alloy composite plate comprises two cladding alloy layers and a core alloy layer disposed between the two cladding alloy layers. The two cladding alloy layers and the core alloy layer are stacked together and welded to the edges. The core alloy layer is made of 6101 aluminum alloy; the cladding alloy layer is made of 1070 aluminum alloy.

[0021] The preparation method includes the following steps: Step S1, Ingot pretreatment: The core alloy ingot and the cladding alloy ingot are milled and cut respectively to obtain core alloy ingots and cladding alloy ingots with flat surfaces; wherein the core alloy ingot is a 6101 alloy ingot and the cladding alloy ingot is a 1070 alloy ingot. Step S2, Stacking and Edge Welding: Stack the three ingots in the order of "cladding alloy ingot – core alloy ingot – cladding alloy ingot". Grind and polish the surfaces of the cladding alloy ingot and the core alloy ingot to a surface roughness Ra≤2.0μm, and clean the surface of the alloy ingot with anhydrous ethanol to remove oil stains. Use aluminum wire welding to weld the cladding alloy ingot and the core alloy ingot in sections along the contact surface edge to obtain a composite alloy ingot. Step S3, thermo-mechanical treatment: The composite alloy billet is subjected to homogenization heat treatment, hot rolling, first cold rolling, solution quenching, first aging, second cold rolling, second aging, straightening and cutting in sequence.

[0022] Specifically, the core alloy comprises the following components by weight percentage: Si 0.40–0.70%, Fe 0.30–0.50%, Cu 0.1–0.2%, Mn ≤0.03%, Mg 0.4–0.8%, Cr ≤0.03%, Zn ≤0.10%, Ti 0.02–0.03%, with the balance being aluminum and unavoidable impurities.

[0023] The aluminum alloy composite plate has a tensile strength ≥230MPa, a yield strength ≥210MPa, and an electrical conductivity ≥62%IACS.

[0024] This invention achieves a synergistic improvement in conductivity and mechanical strength through a three-layer composite structure (the outer layer is made of 1070 high-conductivity pure aluminum, and the core layer is made of 6101 aluminum alloy). The hot-rolled composite process and subsequent heat treatment ensure a strong interfacial metallurgical bond, resulting in a material with advantages such as robust interfacial bonding, stable processing, and suitability for large-scale production. Specifically, step S3 includes the following steps: Step S31: The composite alloy billet is subjected to homogenization heat treatment at 560℃ for 2 to 4 hours in a vertical pusher furnace. Step S32: Immediately after exiting the furnace, hot rolling is carried out, with the final rolling temperature controlled at 240-290℃, to roll into hot-rolled coils with a thickness of 6-8mm; Step S33: Cold roll the obtained hot-rolled coil to a thickness of 2-5 mm; Step S34: The coil is subjected to solution treatment, quenching and pre-stretching in a continuous air cushion furnace to obtain a supersaturated solution-treated coil. Step S35: Perform an aging treatment by holding the solution-treated aluminum coil at 160-200℃ for 2-6 hours; Step S36: Perform a second cold rolling on the coil after the first aging treatment to obtain a cold-worked aluminum coil; Step S37: The cold-worked aluminum coil is kept at 160-200℃ for 6-12 hours for a second aging treatment; Step S38: Finally, the rolled material that has undergone secondary aging treatment is straightened and cross-cut into the required specifications to obtain the finished 6101 aluminum alloy composite plate.

[0025] Specifically, in step S34, the solution temperature is 530–555℃ and the holding time is 30–60s; the quenching treatment uses water quenching with a cooling rate ≥50℃ / s to ensure the formation of a fully supersaturated solid solution, laying the foundation for subsequent aging strengthening.

[0026] Specifically, in step S36, work hardening is introduced, and the total processing rate of the secondary cold rolling is 15-25%.

[0027] Specifically, in step S2, the thickness ratio of the cladding alloy ingot, the core alloy ingot, and the cladding alloy ingot is 50:430:50.

[0028] The advantages of this invention are: (1) The resulting composite plate simultaneously meets the technical indicators of tensile strength ≥230 MPa, yield strength ≥210 MPa, and electrical conductivity ≥62% IACS, successfully breaking through the performance bottleneck of "strong but not conductive, conductive but not strong" of single materials. (2) Through edge welding and fixing before hot rolling and atomic interdiffusion during high-temperature hot rolling, a continuous and dense metallurgical bonding interface is formed. After 180° bending, impact and other tests, there is no delamination or cracking, and the interface bonding strength is high. (3) The whole process is based on conventional aluminum processing production lines (vertical pusher furnace, hot rolling mill, cold rolling mill, continuous air cushion furnace, etc.), without special equipment or complex post-processing. The process window is wide, the batch consistency is good, and it has good prospects for large-scale production. (4) The outer layer of the resulting composite plate, 1070 pure aluminum, provides a high electrical conductivity path and good corrosion resistance, while the core layer, 6101 aluminum alloy, provides structural support and strength guarantee. The thickness ratio is optimized to ensure performance while taking into account material cost and processing efficiency.

[0029] Example 1 Raw material preparation: Core alloy ingot: 6101 alloy ingot, chemical composition (wt%): Si 0.58%, Fe 0.32%, Cu 0.15%, Mn 0.02%, Mg 0.65%, Cr 0.02%, Zn 0.08%, Ti 0.025%, balance Al and unavoidable impurities; Cladding alloy ingot: 1070 alloy ingot (Al content ≥99.7%). Ingot pretreatment. The surface segregation layer of the 6101 alloy ingot was milled off using a milling machine, and the ingot was cut into ingot blanks with dimensions of 430mm (thickness) × 5000mm (length) × 1300mm (width). The surface segregation layer of the 1070 alloy ingot was milled off using a milling machine, and the ingot blanks were cut into ingot blanks with dimensions of 50mm (thickness) × 5000mm (length) × 1300mm (width). The surfaces were ground with a belt sander until the surface roughness Ra ≤ 2.0μm, then cleaned with anhydrous ethanol to remove oil stains from the ingot surface, and allowed to air dry naturally. Stacking and welding: Stack three ingots in the order of "1070-6101-1070", and spot weld them every 15 cm along the four sides with pure aluminum welding wire with a diameter of 1.2 mm, for a total of 12 welding points, to ensure that the ingots do not slip relative to each other during the heating process; Heat-Mechanical Treatment: Homogenization: Placed in a vertical pusher furnace and held at 560℃ for 3 hours; Hot Rolling: Immediately after exiting the furnace, hot rolled to 7.0 mm, with a final rolling temperature of 265℃; First Cold Rolling: Cold rolled to 4.0 mm; Solution Treatment + Quenching: Heated at 530℃ for 1 minute in a continuous air cushion furnace, and immediately water quenched at the exit (measured cooling rate 58℃ / s), while simultaneously performing 1.0% pre-stretching; First Aging: Heated at 180℃ for 4 hours; Second Cold Rolling: Reduction rate of 25% to obtain a 3.0 mm cold-worked hardened coil; Second Aging: Heated at 185℃ for 8 hours; After straightening, cross-cut into 6101 aluminum alloy composite plates with specifications of 3.0 mm × 1000 mm × 2000 mm. The test results of the sheet are as follows: tensile strength 246MPa, yield strength 220MPa, electrical conductivity (20℃): 62.5% IACS, interface bonding performance: after 180° bending (bending radius d=1.0 t, t is the sheet thickness), there is no delamination or cracks; microscopic analysis: SEM observation shows that the core layer and cladding layer interface is continuous and without pores.

[0030] Comparative Example 1 Raw material preparation: 6101 alloy ingot, chemical composition (wt%) is: Si 0.60%, Fe 0.30%, Cu 0.10%, Mn 0.02%, Mg 0.65%, Cr 0.02%, Zn 0.08%, Ti 0.025%, balance is Al and unavoidable impurities; Ingot pretreatment. The surface segregation layer of the 6101 alloy ingot is removed by milling, and it is cut into ingot blanks with dimensions of 430mm (thickness) × 5000mm (length) × 1300mm (width); Heat-Mechanical Treatment: Homogenization: Placed in a vertical pusher furnace and held at 560℃ for 3 hours; Hot Rolling: Immediately after exiting the furnace, hot rolled to 7.0 mm, with a final rolling temperature of 265℃; First Cold Rolling: Cold rolled to 4.0 mm; Solution Treatment + Quenching: Heated at 530℃ for 1 minute in a continuous air cushion furnace, and immediately water quenched at the exit (actual cooling rate 58℃ / s), while simultaneously performing 1.0% pre-stretching; First Aging: Heated at 180℃ for 4 hours; Second Cold Rolling: Reduction rate of 25% to obtain a 3.0 mm cold-worked hardened coil; Second Aging: Heated at 185℃ for 8 hours; After straightening, cross-cut into 6101 aluminum alloy sheets with specifications of 3.0 mm × 1000 mm × 2000 mm.

[0031] Example 2 Raw material preparation. Core alloy ingot: 6101 alloy ingot, chemical composition (wt%): Si 0.60%, Fe 0.35%, Cu 0.10%, Mn 0.02%, Mg 0.50%, Cr 0.01%, Zn 0.05%, Ti 0.02%, balance Al and unavoidable impurities; Cladding alloy ingot: 1070 alloy ingot (Al content ≥99.7%). Ingot pretreatment: The surface segregation layer of the 6101 alloy ingot is removed by milling, and it is cut into ingot blanks with dimensions of 430mm (thickness) × 5000mm (length) × 1300mm (width). The surface segregation layer of the 1070 alloy ingot is removed by milling, and it is cut into ingot blanks with dimensions of 50mm (thickness) × 5000mm (length) × 1300mm (width). The surface is ground with a belt sander until the surface roughness Ra ≤ 1.6μm, then cleaned with anhydrous ethanol to remove oil stains from the ingot surface, and allowed to air dry naturally. Stacking and welding: Stack three ingots in the order of “1070-6101-1070”, and spot weld them every 15 cm along the four sides with pure aluminum welding wire with a diameter of 1.2 mm, for a total of 12 welding points, to ensure that the ingots do not slip relative to each other during the heating process.

[0032] Heat-Mechanical Treatment: Homogenization: Placed in a vertical pusher furnace and held at 560℃ for 2 hours; Hot Rolling: Immediately after exiting the furnace, hot rolled to 6.0 mm, with a final rolling temperature of 280℃; First Cold Rolling: Cold rolled to 3.0 mm; Solution Treatment + Quenching: Heated at 555℃ for 30 seconds in a continuous air cushion furnace, and immediately water quenched at the exit (actual cooling rate 60℃ / s), while simultaneously performing 1.5% pre-stretching; First Aging: Heated at 200℃ for 4 hours; Second Cold Rolling: Reduction rate of 20% to obtain a 2.4 mm cold-worked hardened coil; Second Aging: Heated at 160℃ for 12 hours; After straightening, cross-cut into 6101 aluminum alloy composite plates with specifications of 2.4 mm × 1000 mm × 2000 mm. The test results of the sheet are as follows: tensile strength 235MPa, yield strength 210MPa, electrical conductivity (20℃): 62% IACS, interface bonding performance: after 180° bending (bending radius d=1.0t, t is the sheet thickness), there is no delamination or cracks; microscopic analysis: SEM observation shows that the core layer and cladding layer interface is continuous and without pores.

[0033] Comparative Example 2 Raw material preparation. The chemical composition (wt%) of the 6101 alloy ingot is: Si 0.60%, Fe 0.35%, Cu 0.10%, Mn 0.02%, Mg 0.50%, Cr 0.01%, Zn 0.05%, Ti 0.02%, with the balance being Al and unavoidable impurities. Ingot pretreatment: The surface segregation layer of the 6101 alloy ingot is removed by milling machine and cut into ingot blanks with dimensions of 430mm (thickness) × 5000mm (length) × 1300mm (width).

[0034] Heat-Mechanical Treatment: Homogenization: Placed in a vertical pusher furnace and held at 560℃ for 2 hours; Hot Rolling: Immediately after exiting the furnace, hot rolled to 6.0 mm, with a final rolling temperature of 280℃; First Cold Rolling: Cold rolled to 3.0 mm; Solution Treatment + Quenching: Heated at 555℃ for 30 seconds in a continuous air cushion furnace, and immediately water quenched at the exit (actual cooling rate 60℃ / s), while simultaneously performing 1.5% pre-stretching; First Aging: Heated at 200℃ for 4 hours; Second Cold Rolling: Reduction rate of 20% to obtain a 2.4 mm cold-worked coil; Second Aging: Heated at 160℃ for 12 hours; After straightening, cross-cut into 6101 aluminum alloy sheets with specifications of 2.4 mm × 1000 mm × 2000 mm.

[0035] The test data of mechanical and electrical properties of the aluminum alloy sheets of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1.

[0036] Table 1 As can be seen from the comparison in Table 1, while maintaining high strength, the electrical conductivity of the present invention is significantly improved by nearly 10% IACS, which fully verifies the effectiveness and superiority of the 6101 and 1070 composite plate.

[0037] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0038] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0039] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles, characterized in that: The 6101 aluminum alloy composite plate comprises two cladding alloy layers and a core alloy layer disposed between the two cladding alloy layers, wherein the two cladding alloy layers and the core alloy layer are laminated together; the preparation method includes the following steps: Step S1: Mill and cut the core alloy ingot and cladding alloy ingot respectively to obtain core alloy ingot blanks and cladding alloy ingot blanks with flat surfaces; wherein the core alloy ingot is a 6101 alloy ingot and the cladding alloy ingot is a 1070 alloy ingot. Step S2: Stack the three ingots in the order of "cladding alloy ingot – core alloy ingot – cladding alloy ingot", and weld the two cladding alloy ingots and the core alloy ingot at the edge to obtain a composite alloy ingot; use aluminum wire welding to weld the contact surfaces of the cladding alloy ingot and the core alloy ingot in sections. Step S3: The composite alloy billet is subjected to homogenization heat treatment, hot rolling, cold rolling once, solution quenching, aging once, cold rolling twice, aging twice, straightening and cutting to finally obtain 6101 aluminum alloy composite plate. The specific steps of step S3 include: Step S31: The composite alloy billet is subjected to homogenization heat treatment by entering a vertical pusher furnace and holding at 560℃ for 2 to 4 hours. Step S32: Immediately after exiting the furnace, hot rolling is carried out, with the final rolling temperature controlled at 240-290℃, to produce hot-rolled coils with a thickness of 6-8 mm; Step S33: Cold roll the obtained hot-rolled coil to a thickness of 2-5 mm; Step S34: The coil is subjected to solution treatment, quenching and pre-stretching in a continuous air cushion furnace to obtain a supersaturated solution-treated coil. Step S35: Perform an aging treatment by keeping the supersaturated solution-treated roll material at 160-200℃ for 2-6 hours; Step S36: Perform a second cold rolling on the coil after the first aging treatment to obtain a cold-worked aluminum coil; Step S37: The cold-worked aluminum coil is subjected to a second aging treatment by holding it at 160-200℃ for 6-12 hours; Step S38: The roll material that has undergone secondary aging treatment is straightened and cross-cut into the required specifications to obtain the finished 6101 aluminum alloy composite plate. In step S34, the solution temperature is 530–555℃, and the holding time is 30–60 s; the quenching treatment uses water quenching, and the cooling rate is ≥50℃ / s. In step S36, the secondary cold rolling rate is 15-25%.

2. The method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles according to claim 1, characterized in that: The core alloy comprises the following components by weight percentage: Si 0.40–0.70%, Fe 0.30–0.50%, Cu 0.1–0.2%, Mn ≤0.03%, Mg 0.4–0.8%, Cr ≤0.03%, Zn ≤0.10%, Ti 0.02–0.03%, with the balance being aluminum and unavoidable impurities.

3. The method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles according to claim 1, characterized in that: The aluminum alloy composite plate has a tensile strength ≥230MPa, a yield strength ≥210MPa, and an electrical conductivity ≥62%IACS.

4. The method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles according to claim 1, characterized in that: The specific steps of step S2 include: grinding the surfaces of the cladding alloy ingot and the core alloy ingot to a surface roughness Ra≤2.0μm, cleaning the surface of the alloy ingot with anhydrous ethanol to remove oil stains, and then stacking and welding them.

5. The method for preparing a 6101 aluminum alloy composite plate for conductive busbars in new energy vehicles according to claim 1, characterized in that: In step S2, the thickness ratio of the cladding alloy ingot, the core alloy ingot, and the cladding alloy ingot is 50:430:50.

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