Aluminum alloy material for battery explosion-proof valve and preparation method of aluminum alloy material

Abstract

The invention relates to the technical field of aluminum alloy preparation, in particular to an aluminum alloy material for a battery explosion-proof valve and a preparation method thereof.The aluminum alloy material for the battery explosion-proof valve comprises, by mass, less than or equal to 0.1 wt% of Si, 0.8-1.6 wt% of Fe, less than or equal to 0.05 wt% of Cu, 0.3-0.8 wt% of Mn, less than or equal to 0.01 wt% of Zn, 0.01-0.16 wt% of Ti and the balance aluminum and inevitable impurities, and the single content of the impurities is less than 0.05 wt%. By controlling the components and the mass percent thereof, the tensile strength of the prepared aluminum alloy is 95 MPa or above, the ductility is 40% or above, and the average size of recrystallized grains is 10-25 microns.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and relates to a lithium-ion battery with an aluminum alloy shell structure. When the internal pressure of the battery reaches a safe upper limit, the explosion-proof valve of the battery made of the aluminum alloy material ruptures preferentially, so as to protect the lithium ion battery. The invention discloses the protective effect of shell explosion caused by excessive battery pressure, and specifically relates to an aluminum alloy material used for a battery explosion-proof valve and a preparation method thereof. Background technique [0002] At present, with the promotion of new energy vehicles, the demand for lithium-ion batteries for vehicles is increasing. Since lithium-ion batteries may produce high-temperature and high-pressure gas during use, if they cannot be discharged to the outside of the lithium-ion battery, an explosion may occur The fire caused a serious safety...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent: An aluminum alloy strip for a new energy battery cover explosion-proof valve and its preparation method, authorized announcement number: CN107502787 A, authorized announcement date: December 22, 2017, developed a The aluminum alloy strip for new energy battery cover explosion-proof valves with stable burst pressure and excellent laser welding performance is suitable for the current production requirements and production methods of battery cover explosion-proof sheets, but its elongation rate is between 35.6% and 37.2%, which cannot To meet the ductility production requirements of the current battery cover explosion-proof valve, it is necessary to design an aluminum alloy material for battery explosion-proof valve and its preparation method to solve the above problems