Surface-treated steel sheet for cell container

Patent metadata

Field	Value
Publication number	US-11799156-B2
Application number	US-202117162667-A
Country	US
Kind code	B2
Filing date	Jan 29, 2021
Priority date	Dec 3, 2015
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A surface-treated steel sheet for a battery container includes 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. 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 (D2−D1) between the depth (D1) at which the Fe intensity exhibits a first predetermined value and the depth (D2) 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 10.8 to 26.7 g/m2.

First claim

The invention claimed is:

1. A surface-treated steel sheet for a battery container, comprising:
a steel sheet;
an iron-nickel diffusion layer formed on a first surface of the steel sheet to be an inner surface of the battery container;
a first nickel layer formed on the iron-nickel diffusion layer and constituting an outermost layer, the first nickel layer consisting of nickel; and
a second nickel layer constituting an outermost layer on a second surface of the steel sheet to be an outer surface of the battery container, the second nickel layer consisting of nickel,
wherein when the Fe intensity and the Ni intensity are continuously measured from the first 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, a 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,
wherein a ratio of the thickness of the iron-nickel diffusion layer to a thickness of the first nickel layer is 0.013 to 0.5,
wherein a total amount of the nickel contained in the iron-nickel diffusion layer and the nickel contained in the first nickel layer is 10.8 to 26.7 g/m2,
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
wherein 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 thickness of the first nickel layer is 1.0 μm or more.

3. The surface-treated steel sheet for a battery container according to claim 1 , wherein the Vickers hardness (HV) of the first nickel layer measured with a load of 10 gf is 220 to 280.

4. The surface-treated steel sheet for a battery container according to claim 1 , wherein the thickness of the iron-nickel diffusion layer is 0.09 to 0.2 μm.

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 .

Assignees

• Toyo Kohan Co Ltd

Inventors

• Sadaki Kota
• Yoshioka Koh

Classifications

• H01M50/124 Primary

  having a layered structure · CPC title

• B32B15/013

  one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium · CPC title

• B32B15/015 Primary

  the said other metal being copper or nickel or an alloy thereof · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• B32B15/043

  of metal (B32B15/01 takes precedence) · CPC title