Aluminum alloy plate strip for lithium battery cover plate and preparation method of aluminum alloy plate strip

An aluminum alloy strip and lithium battery technology, applied in the field of aluminum alloy processing, can solve problems such as being unsuitable for manufacturing an integrated cover plate, increasing material manufacturing costs, increasing raw material costs, etc., achieving good mechanical properties, improving corrosion resistance, The effect of improving purity

Inactive Publication Date: 2021-07-09
CHINALCO MATERIALS APPL RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This alloy is suitable for making battery cover plates, but due to the strict control of Si content (<0.05wt%), the cost of material manufacturing is increased, which is not conducive to the cost reduction of lithium batteries
[0006] Patent No. 201610885952.5 discloses materials for aluminum alloy explosion-proof valves for battery casings, containing 0.5-1.4wt% Fe, 0.2-1wt% Mn, <0.1wt% Si, and the content range of elements Fe and Mn is too wide, especially Mn The upper limit of the element is 1wt%, and the composition of some ranges (such as high Mn, low Fe) has no processing softening characteristics, and is not suitable for the manufacture of integrated cover plates
In addition, Bi and Sm elements are added. These two alloy elements are far more expensive than other commonly used aluminum alloy elements, which will undoubtedly increase the cost of raw materials and complicate the manufacturing process.

Method used

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  • Aluminum alloy plate strip for lithium battery cover plate and preparation method of aluminum alloy plate strip
  • Aluminum alloy plate strip for lithium battery cover plate and preparation method of aluminum alloy plate strip
  • Aluminum alloy plate strip for lithium battery cover plate and preparation method of aluminum alloy plate strip

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Experimental program
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Effect test

Embodiment 1

[0065] Pure aluminum, AlFe10, AlMn10, AlSi20, AlCa10, AlTi5B0.2 intermediate alloys are melted and cast into ingots (slabs) with the alloy composition given in Table 1, with a thickness of 490 mm; The heating rate of °C / h is raised to 580 °C for 20 hours, and then cooled to 500 °C with a cooling rate of 60 °C / h and kept for 5 hours; hot rolling is carried out, and the temperature of hot rolling is controlled at 270 °C; Rolled to 1.5mm, the cold rolling rate is 71%; for annealing treatment, the cold-rolled strip is heated to 350°C at a heating rate of 30°C / s and kept for 40s, and then cooled to below 100°C at a rate of 30°C / s; A fully annealed sheet and strip is obtained.

Embodiment 2

[0067] Melt and cast pure aluminum, AlFe10, AlMn10, AlSi20, AlCa10, AlTi5B0.2 master alloys into ingots with the alloy composition given in Table 1, with a thickness of 490mm; The heating rate is raised to 600°C for 12 hours, then cooled to 450°C at a cooling rate of 80°C / h and held for 10 hours; hot rolling is carried out, and the temperature of the hot final rolling is controlled at 270°C; the hot-rolled strip is cold-rolled to 1.5mm , the cold rolling rate is 71%; the cold-rolled strip is heated to 350°C at a heating rate of 15°C / s and kept for 40s, and then cooled to below 100°C at a rate of 30°C / s; a fully annealed strip is obtained .

Embodiment 3

[0069] Melt and cast pure aluminum, AlFe10, AlMn10, AlSi20, AlCa10, AlTi5B0.2 master alloys into ingots with the alloy composition given in Table 1, with a thickness of 490 mm; The heating rate is raised to 600°C for 12 hours, then cooled to 550°C at a cooling rate of 60°C / h and held for 7 hours; hot rolling is carried out, and the temperature of the hot final rolling is controlled at 270°C; the hot-rolled strip is cold-rolled to 1.5mm , the cold rolling rate is 89%; the cold-rolled strip is heated to 350°C at a heating rate of 50°C / s and kept for 40s, and then cooled to below 100°C at a rate of 30°C / s; a fully annealed strip is obtained .

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Abstract

The invention discloses an aluminum alloy plate strip for a lithium battery cover plate and a preparation method of the aluminum alloy plate strip. The aluminum alloy plate strip comprises the following components of, in percentage by mass, 1.18 wt%-1.8 wt% of Fe, Mn less than or equal to 0.395 wt% 0.03 wt%-0.08 wt% of Ca, 0.1 wt%-0.3 wt% of Si and the balance Al and inevitable impurities, wherein Fe + Mn is less than 2 wt%, Fe/Mn is more than or equal to 2.5, Mn + Si is less than 0.6 wt%, and (Fe + Mn + Ca)/Si is more than or equal to 2.5. According to the aluminum alloy plate strip for the lithium battery cover plate and the preparation method of the aluminum alloy plate strip, the alloy has good mechanical performance, forming performance and laser welding performance at the same time, especially the performance stability of a material can be improved, and a prepared explosion-proof valve has stable explosion pressure.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to an aluminum alloy plate and strip for a lithium battery cover plate and a preparation method thereof. Background technique [0002] Lithium-ion batteries have become the most important power source for new energy vehicles due to their small size and large specific capacity. The battery cover is one of the important structural parts of the lithium battery. It has the characteristics of anti-overvoltage, anti-overcurrent, and explosion-proof, and protects the safety of the power lithium battery. Automatic rupture and pressure relief to avoid battery explosion, with high technological content. Therefore, the performance and stability of the battery cover and explosion-proof disc are very important to the consistency and safety of the battery pack. It is not only required that the aluminum material for the cover plate and explosion-proof valve have good processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03C22F1/04H01M50/159
CPCC22C21/00C22C1/03C22C1/026C22F1/04
Inventor 潘琰峰陈伟赵丕植陈雨楠郭世杰
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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