Nickel-plated steel strip, steel battery case manufactured from the steel strip, and method of manufacturing the steel battery case

Abstract

The invention relates to a nickel-plated steel strip, a steel battery case manufactured from the steel strip, and a method of manufacturing the steel battery case. In the invention, firstly, a pre-nickel-plating layer is formed on the inner surface of the steel strip; then through thermal treatment, a surface layer and a bottom Fe-Ni alloy layer are formed from the inter-permeated pre-nickel-plating layer and a contact surface, a part of the nickel-plating layer being reserved between the surface layer and the bottom Fe-Ni alloy layer, so that a problem that on the steel strip, during a steelcase stamping process, cracks are liable to generate in the plating layer is avoided; the surface layer and the bottom Fe-Ni alloy layer formed through the thermal treatment have compact structure, sothat not only is excellent anticorrosive performance achieved, but also the combining force between the Fe-Ni alloy layer and the Fe substrate is far higher than that between the plating layer and the Fe substrate in the prior art, so that by improving the combining force between the plating layer and the Fe substrate, the problem of forming cracks in the plating layer during the steel case stamping process is greatly solved, thus solving liquid leakage during long time storage of the battery. In addition, a part of the nickel-plating layer is reserved, thus preventing iron from dissolving out from the Fe-Ni alloy layer.

Description

technical field

[0001] The invention relates to the technical field of steel strips and steel cases for batteries, in particular to a Ni-plated steel strip, a battery steel case using the steel strip, and a preparation method for the steel case. Background technique

[0002] The steel case for batteries adopts the process of nickel-plating on the surface of the iron substrate, and the nickel-plating process is usually divided into two processes: pre-nickel plating and post-plating.

[0003] Foreign battery manufacturers mainly use pre-nickel plating process. This process is to first nickel-plate the surface of the steel strip, the raw material of the steel shell, to become a pre-nickel-plated steel strip, and then stretch and punch it to form a steel shell. The pre-nickel plating process has the following advantages:

[0004] (1) Since pre-plating is to electroplate the raw material steel strip of the steel shell earlier, the thickness of the electroplating layer on the su...

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