Surface-treated steel plate for cell container

Patent metadata

Field	Value
Publication number	US-2018351138-A1
Application number	US-201615780935-A
Country	US
Kind code	A1
Filing date	Dec 5, 2016
Priority date	Dec 3, 2015
Publication date	Dec 6, 2018
Grant date	—

Abstract

A surface-treated steel sheet for a battery container, including a steel sheet, an iron-nickel diffusion layer formed on the steel sheet, and a nickel layer formed on the iron-nickel diffusion layer and constituting the outermost layer, wherein when the Fe intensity and the Ni intensity are continuously measured from the surface of the surface-treated steel sheet for a battery container along the depth direction with a high frequency glow discharge optical emission spectrometric analyzer, the thickness of the iron-nickel diffusion layer being the difference between the depth at which the Fe intensity exhibits a first predetermined value and the depth at which the Ni intensity exhibits a second predetermined value is 0.04 to 0.31 μm; and the total amount of the nickel contained in the iron-nickel diffusion layer and the nickel contained in the nickel layer is 4.4 g/m2 or more and less than 10.8 g/m2.

First claim

1 . A surface-treated steel sheet for a battery container, comprising:
a steel sheet, an iron-nickel diffusion layer formed on the steel sheet; and a nickel layer formed on the iron-nickel diffusion layer and constituting the outermost layer, wherein when the Fe intensity and the Ni intensity are continuously measured from the surface of the surface-treated steel sheet for a battery container along the depth direction with a high frequency glow discharge optical emission spectrometric analyzer, the thickness of the iron-nickel diffusion layer being the difference (D 2 −D 1 ) between the depth (D 1 ) at which the Fe intensity exhibits a first predetermined value and the depth (D 2 ) at which the Ni intensity exhibits a second predetermined value is 0.04 to 0.31 μm; and the total amount of the nickel contained in the iron-nickel diffusion layer and the nickel contained in the nickel layer is 4.4 g/m 2 or more and less than 10.8 g/m 2 , wherein the depth (D 1 ) exhibiting the first predetermined value is the depth exhibiting an intensity of 10% of the saturated value of the Fe intensity measured by the above-described measurement, and the depth (D 2 ) exhibiting the second predetermined value is the depth exhibiting an intensity of 10% of the maximum value when the measurement is further performed along the depth direction after the Ni intensity shows the maximum value by the above-described measurement.

2 . The surface-treated steel sheet for a battery container according to claim 1 , wherein the average crystal grain size in the surface portion of the nickel layer is 0.2 to 0.6 μm.

3 . The surface-treated steel sheet for a battery container according to claim 1 , wherein the thickness of the nickel layer is 0.4 to 1.2 μm.

4 . The surface-treated steel sheet for a battery container according to claim 1 , wherein the Vickers hardness (HV) of the nickel layer measured with a load of 10 gf is 200 to 280.

5 . A battery container made of the surface-treated steel sheet for a battery container according to claim 1 .

6 . A battery provided with the battery container according to claim 5 .

7 . A method for producing a surface-treated steel sheet for a battery container, comprising:
a nickel plating step of forming a nickel plating layer on a steel sheet with a nickel amount of 4.4 g/m 2 or more and less than 10.8 g/m 2 ; and a heat treatment step of applying a heat treatment to the steel sheet having the nickel plating layer formed thereon by maintaining the steel sheet at a temperature of 450 to 600° C. for 30 seconds to 2 minutes to thereby form an iron-nickel diffusion layer having a thickness of 0.04 to 0.31 μm.

Assignees

• Toyo Kohan Co Ltd

Inventors

• Asada Kengo
• Suda Masao
• Sadaki Kota
• Minagi Hideyuki

Classifications

• H01M50/134

  Hardness · CPC title

• H01M50/133

  Thickness · CPC title

• H01M50/119

  Metals · CPC title

• C25D5/50 Primary

  by heat-treatment · CPC title

• H01M2002/0297

  Electricity · mapped topic