Nickel-plated, heat-treated steel sheet for battery cans

Patent metadata

Field	Value
Publication number	US-10873061-B2
Application number	US-201615780862-A
Country	US
Kind code	B2
Filing date	Dec 5, 2016
Priority date	Dec 3, 2015
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A nickel-plated heat-treated steel sheet for a battery can, having a nickel layer with a nickel amount of 4.4 to 26.7 g/m2 on a steel sheet. When the Fe intensity and the Ni intensity are continuously measured along the depth direction from the surface of the nickel-plated heat-treated steel sheet for a battery can, by using a high frequency glow discharge optical emission spectrometric analyzer, 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 less than 0.04 μm.

First claim

The invention claimed is:

1. A nickel plated heat treated steel sheet for a battery can, comprising:
a bottomed cylindrical shaped article made of a surface-treated steel sheet, wherein the surface-treated steel sheet comprises:
a nickel layer constituting an outermost layer with a nickel amount of 4.4 to 26.7 g/m 2 deposed on an inner surface of the bottomed cylindrical shaped article,
wherein when a Fe intensity and a Ni intensity are continuously measured along depth direction from the inner surface of the bottomed cylindrical shaped article, by using a high frequency glow discharge optical emission spectrometric analyzer, a difference (D2−D1) between a depth (D1) at which the Fe intensity exhibits a first predetermined value and a depth (D2) at which the Ni intensity exhibits a second predetermined value is less than 0.04 μm,
wherein the depth (D1) exhibiting the first predetermined value is a depth exhibiting an intensity of 10% of a saturated value of the Fe intensity measured by the above-described measurement, and
the depth (D2) exhibiting the second predetermined value is a depth exhibiting an intensity of 10% of a 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 battery can according to claim 1 , wherein a ratio of a thickness of the iron-nickel diffusion layer to a thickness of the nickel layer (thickness of iron-nickel diffusion layer/thickness of nickel layer) is 0.08 or less.

3. The battery can according to claim 1 , wherein a thickness of the nickel layer is more than 0.5 μm.

4. The battery can according to claim 1 , wherein a Vickers hardness (HV) of the nickel layer measured with a load of 10 gf is more than 220.

5. A battery provided with the battery container according to claim 1 .

6. A method for producing a battery can having a nickel-plated heat-treated steel sheet, the method comprising:
forming a bottomed cylindrical shaped article having an inner surface, and
forming the nickel-plated heat-treated steel sheet by a method comprising:
forming a nickel plating layer on a surface of a steel sheet with a nickel amount of 4.4 to 26.7 g/m 2 , and
forming an iron-nickel diffusion layer and a nickel layer constituting an outermost layer by applying a heat treatment to the steel sheet having the nickel plating layer formed thereon by maintaining the steel sheet at a temperature of 350° C. to 450° C. for 30 seconds to 2 minutes,
wherein the nickel plating layer is formed on the inner surface of the bottomed cylindrical shaped article.

Assignees

• Toyo Kohan Co Ltd

Inventors

• Sadaki Kota
• Yoshioka Koh

Classifications

• H01M50/134

  Hardness · CPC title

• H01M50/133

  Thickness · CPC title

• H01M50/119

  Metals · CPC title

• C25D7/00

  Electroplating characterised by the article coated · CPC title

• H01M50/107

  having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) · CPC title