Steel for battery negative electrode bottom cover and preparation method thereof

The invention relates to steel for a battery negative electrode bottom cover and a preparation method thereof. The steel for the battery negative electrode bottom cover comprises the following components in percentage by weight: 0.02-0.06% of C; si < = 0.1%; mn: 0.1%-1.0%; p is less than or equal to 0.02%; s is less than or equal to 0.02%; 0.01% to 0.1% of Al; n: 0.004% to 0.01%; and the balance of Fe and inevitable inclusions. According to the steel for the battery negative electrode bottom cover, precious alloys such as Nb and Ti do not need to be added, decarburization treatment is not needed, and the alloy smelting and process cost is relatively low; and moreover, through optimal design of the components and the weight percentage, the hardness is properly improved, so that the performance of the punching sheet is improved, the speed of punching and processing the battery negative electrode bottom cover is favorably improved, and the production efficiency is improved. 本发明涉及一种电池负极底盖用钢及其制备方法。该电池负极底盖用钢的组分及重量百