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EP-4737601-A1 - ALUMINUM ALLOY MATERIAL, ALUMINUM ALLOY STRUCTURAL PART AND PREPARATION METHOD THEREFOR, BATTERY BOX BODY, BATTERY SYSTEM, ELECTRIC DEVICE AND USE

EP4737601A1EP 4737601 A1EP4737601 A1EP 4737601A1EP-4737601-A1

Abstract

An aluminum alloy material, an aluminum alloy structural component, a preparation method of an aluminum alloy structural component, a battery box, a battery system, an electric apparatus (6), and an application are provided. By mass percentage, the aluminum alloy material includes silicon element, copper element, titanium element, magnesium element, zinc element, manganese element, strontium element, a matrix element Al, and unavoidable impurity elements. The aluminum alloy material includes no Al 2 Cu phase or includes a small amount of Al 2 Cu phase.

Inventors

  • JIA, Jun
  • WANG, QING
  • WANG, XIANG
  • LIN, Zhiquan
  • FENG, KAI
  • DU, Shangzhe

Assignees

  • Contemporary Amperex Technology Co., Limited
  • Shanghai Jiao Tong University

Dates

Publication Date
20260506
Application Date
20240904

Claims (20)

  1. An aluminum alloy material, wherein by mass percentage, the aluminum alloy material comprises the following constituent elements: 6%-11% of Si, 0.5%-0.9% of Cu, 0.1%-0.4% of Ti, 0.2%-0.6% of Mg, 0.25%-0.6% of Zn, 0.5%-1.1% of Mn, 0.01%-0.05% of Sr, a matrix element Al, and unavoidable impurity elements; wherein the aluminum alloy material comprises or does not comprise an Al 2 Cu phase, and a mass fraction of the Al 2 Cu phase in the aluminum alloy material is less than or equal to 1.3%.
  2. The aluminum alloy material according to claim 1, satisfying one or two of the following characteristics: a mass percentage of Cu element in the aluminum alloy material is 0.5% to 0.8%; and the aluminum alloy material comprises the Al 2 Cu phase, and the mass fraction of the Al 2 Cu phase in the aluminum alloy material is 0.1% to 1.3%.
  3. The aluminum alloy material according to claim 1 or 2, satisfying one or two of the following characteristics: a mass percentage of Cu element in the aluminum alloy material is 0.6% to 0.8%; and the aluminum alloy material comprises the Al 2 Cu phase, and the mass fraction of the Al 2 Cu phase in the aluminum alloy material is 0.8% to 1.3%.
  4. The aluminum alloy material according to any one of claims 1 to 3, wherein the aluminum alloy material comprises a fibrous Al-Si eutectic structure; and the aluminum alloy material comprises an Al 3 Ti strengthening phase.
  5. The aluminum alloy material according to claim 4, satisfying one, two, or three of the following characteristics: a mass percentage of Si element in the aluminum alloy material is 6.5% to 11%; a mass percentage of Ti element in the aluminum alloy material is 0.2% to 0.4%; and a mass fraction of the Al 3 Ti strengthening phase in the aluminum alloy material is 0.3% to 2%.
  6. The aluminum alloy material according to claim 4 or 5, satisfying one, two, or three of the following characteristics: a mass percentage of Si element in the aluminum alloy material is 8% to 11%; a mass percentage of Ti element in the aluminum alloy material is 0.25% to 0.4%; and a mass fraction of the Al 3 Ti strengthening phase in the aluminum alloy material is 0.3% to 1%, optionally 0.35% to 0.6%.
  7. The aluminum alloy material according to any one of claims 1 to 6, wherein the aluminum alloy material comprises or does not comprise an Mg 2 Si phase, and a mass fraction of the Mg 2 Si phase in the aluminum alloy material is less than or equal to 0.05%, optionally 0%.
  8. The aluminum alloy material according to claim 7, satisfying one, two, or three of the following characteristics: a mass percentage of Mg element in the aluminum alloy material is 0.3% to 0.6%; a mass percentage of Zn element in the aluminum alloy material is 0.3% to 0.6%; and a mass ratio of Mg element to Zn element in the aluminum alloy material is 1:(1.1-1.3).
  9. The aluminum alloy material according to claim 7 or 8, satisfying one or two of the following characteristics: a mass percentage of Mg element in the aluminum alloy material is 0.3% to 0.5%; a mass percentage of Zn element in the aluminum alloy material is 0.4% to 0.6%; and a mass ratio of Mg element to Zn element in the aluminum alloy material is 1:(1.1-1.25).
  10. The aluminum alloy material according to any one of claims 1 to 9, wherein the unavoidable impurity elements comprise Fe element.
  11. The aluminum alloy material according to any one of claims 1 to 10, satisfying one or two of the following characteristics: a mass percentage of Mn element in the aluminum alloy material is 0.7% to 1.1%, optionally 0.8% to 1.1%; and the aluminum alloy material comprises an AlSiMnFe phase; a mass fraction of the AlSiMnFe phase in the aluminum alloy material is less than or equal to 0.2%, optionally less than or equal to 0.1%; and optionally, the aluminum alloy material comprises an AlSiMnFe phase.
  12. The aluminum alloy material according to any one of claims 1 to 11, wherein a mass proportion of Sr element in the aluminum alloy material is 200 ppm to 500 ppm.
  13. The aluminum alloy material according to any one of claims 1 to 12, wherein by mass percentage, the aluminum alloy material comprises the following constituent elements: 6%-11% of Si, 0.5%-0.9% of Cu, 0.1%-0.4% of Ti, 0.3%-0.6% of Mg, 0.3%-0.6% of Zn, 0.5%-1.1% of Mn, 0.01%-0.05% of Sr, unavoidable impurity elements, and the balance of matrix element Al.
  14. The aluminum alloy material according to claim 13, wherein by mass percentage, the aluminum alloy material comprises the following constituent elements: 6.5%-11% of Si, 0.5%-0.8% of Cu, 0.2%-0.4% of Ti, 0.3%-0.6% of Mg, 0.3%-0.6% of Zn, 0.7%-1.1% of Mn, 0.02%-0.05% of Sr, unavoidable impurity elements, and the balance of matrix element Al.
  15. The aluminum alloy material according to claim 13, wherein by mass percentage, the aluminum alloy material comprises the following constituent elements: 8%-11% of Si, 0.6%-0.8% of Cu, 0.25%-0.4% of Ti, 0.3%-0.5% of Mg, 0.4%-0.6% of Zn, 0.8%-1.1% of Mn, 0.03%-0.05% of Sr, unavoidable impurity elements, and the balance of matrix element Al.
  16. An aluminum alloy structural component, wherein the aluminum alloy structural component is a formed body of the aluminum alloy material according to any one of claims 1 to 15.
  17. A preparation method of an aluminum alloy structural component, comprising the following steps: heating and melting an aluminum ingot, adding ingredients determined according to a nominal composition of the aluminum alloy material according to any one of claims 1 to 15 in a form of intermediate alloys, and performing melting and slag removal to prepare a refined aluminum alloy melt; performing cast molding on the refined aluminum alloy melt to prepare an aluminum alloy ingot; and performing heat treatment and cooling on the aluminum alloy ingot to obtain the aluminum alloy structural component.
  18. A battery box, wherein the battery box satisfies at least one of the following characteristics: at least part of structural components in the battery box comprise the aluminum alloy material according to any one of claims 1 to 15; the battery box comprises the aluminum alloy structural component according to claim 16; and the battery box comprises an aluminum alloy structural component prepared by the preparation method of an aluminum alloy structural component according to claim 17.
  19. A battery system, wherein the battery system comprises the battery box according to claim 18 and a battery cell located inside the battery box.
  20. The battery system according to claim 19, wherein the battery cell comprises a liquid electrolyte.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. CN2023116079934, filed on November 27, 2023, entitled "ALUMINUM ALLOY MATERIAL, ALUMINUM ALLOY STRUCTURAL COMPONENT AND PREPARATION METHOD THEREOF, BATTERY BOX, BATTERY SYSTEM, ELECTRIC APPARATUS, AND APPLICATION", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of aluminum alloy material technologies, further relates to the field of battery box material technologies, and more further relates to an aluminum alloy material, an aluminum alloy structural component, a preparation method of an aluminum alloy structural component, a battery box, a battery system, an electric apparatus, and an application. BACKGROUND The statements herein only provide background information related to this application and do not necessarily constitute the prior art. A battery box is a key component of a battery, playing an important role in protecting the battery. For a battery containing an electrolyte, a battery box is required not only to have good mechanical properties to reduce damage to the battery upon impact but also to have certain corrosion resistance to extend the service life of the battery. The corrosion resistance of current aluminum alloy materials needs further improvement. SUMMARY According to various implementations and embodiments of this application, an aluminum alloy material, an aluminum alloy structural component and preparation method thereof, a battery box, a battery system, an electric apparatus, and an application are provided in this application, where the aluminum alloy material has good mechanical properties and excellent corrosion resistance, can be used as a main material of a battery box, and is conducive to is conducive to extending the service life of the battery box. According to a first aspect, this application provides an aluminum alloy material, including silicon (Si) element, copper (Cu) element, titanium (Ti) element, magnesium (Mg) element, zinc (Zn) element, manganese (Mn) element, strontium (Sr) element, a matrix element Al, and unavoidable impurity elements, where the aluminum alloy material includes no Al2Cu phase or a small amount of Al2Cu phase, for example, a mass fraction of the Al2Cu phase in the aluminum alloy material is low (for example, ≤ 1.3%). In some implementations, the aluminum alloy material includes the following constituent elements: 6% to 11% of Si, 0.5% to 0.9% of Cu, 0.1% to 0.4% of Ti, 0.2% to 0.6% of Mg, 0.25% to 0.6% of Zn, 0.5% to 1.1% of Mn, 0.01% to 0.05% of Sr, a matrix element Al, and unavoidable impurity elements; where the aluminum alloy material includes no Al2Cu phase or a small amount of Al2Cu phase, for example, a content of the Al2Cu phase is less than or equal to 1.3%. In some implementations, an aluminum alloy material is provided, which includes, by mass percentage, the following constituent elements: 6% to 11% of Si, 0.5% to 0.9% of Cu, 0.1% to 0.4% of Ti, 0.2% to 0.6% of Mg, 0.25% to 0.6% of Zn, 0.5% to 1.1% of Mn, 0.01% to 0.05% of Sr, a matrix element Al, and unavoidable impurity elements; where the aluminum alloy material includes or does not include an Al2Cu phase, optionally, a mass fraction of the Al2Cu phase in the aluminum alloy material is less than or equal to 1.3%. The aluminum alloy material uses aluminum (Al) as a matrix element, and includes silicon (Si) element, copper (Cu) element, titanium (Ti) element, magnesium (Mg) element, zinc (Zn) element, manganese (Mn) element, and strontium (Sr) element. By controlling the constituent elements of the aluminum alloy material within the aforementioned content ranges, the matrix element Al in the aluminum alloy material forms an α-Al matrix phase, where the matrix phase is mainly distributed in a form of near-equiaxed crystals, and the Si element can form an Al-Si eutectic phase with the α-Al matrix phase, providing good basic mechanical properties. The introduction of the Cu element may form a bone-like or needle-like Al2Cu phase, where the Al2Cu phase has a certain strengthening effect. An increase in Cu content is conducive to enhancing the mechanical strength of the material, for example, altering the morphology of an impurity phase by being combined with the impurity phase so as to reduce deterioration to the mechanical properties caused by the impurity phase. However, a high Cu content is likely to reduce the corrosion resistance of the aluminum alloy material and is also likely to reduce an elongation of the aluminum alloy material. The Al2Cu phase has a more positive potential, and a matrix phase with a high Cu content also has a more positive potential. In this case, a matrix phase with a low Cu content serves as a cathode phase to form a local electrochemical microcell with a nearby Cu-rich matrix phase and the Al2Cu phase, causing continuous corrosion of a matrix phase portion of a Cu-lack solid solution. The c