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

Patent metadata

Field	Value
Publication number	US-2018366691-A1
Application number	US-201615780862-A
Country	US
Kind code	A1
Filing date	Dec 5, 2016
Priority date	Dec 3, 2015
Publication date	Dec 20, 2018
Grant date	—

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

1 . A nickel-plated heat-treated steel sheet for a battery can, comprising:
a nickel layer with a nickel amount of 4.4 to 26.7 g/m 2 on a steel sheet, wherein 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 (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 less than 0.04 m, wherein the depth (D1) 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 (D2) 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 nickel-plated heat-treated steel sheet for a battery can according to claim 1 , wherein the ratio of the thickness of the iron-nickel diffusion layer to the thickness of the nickel layer (thickness of iron-nickel diffusion layer/thickness of nickel layer) is 0.08 or less.

3 . The nickel-plated heat-treated steel sheet for a battery can according to claim 1 , wherein the thickness of the nickel layer is more than 0.5 μm.

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

5 . A battery container made of the nickel-plated heat-treated steel sheet for a battery can according to claim 1 .

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

7 . A method for producing a nickel-plated heat-treated steel sheet for a battery can, comprising:
a nickel plating step of forming a nickel plating layer on a steel sheet with a nickel amount of 4.4 to 26.7 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 350° C. or higher and lower than 450° C. for 30 seconds to 2 minutes.

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

• H01M2/0287 Primary

  Electricity · mapped topic

• C25D3/12

  of nickel or cobalt · CPC title