Ni-plated steel sheet with excellent pressability for battery can

A technology of battery cans and steel plates, applied in battery pack parts, battery boxes/jackets, battery box/cover materials, etc., can solve the problem of less frequent replacement of pressurized molds, and achieve the effect of inhibiting wear and tear

Active Publication Date: 2012-10-31
TOYO KOHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, Japanese Patent No. 3631143 (Patent Document 3) describes that the fluidity of the battery can is improved by performing glossy Ni-Co alloy plating on the outer surface of the battery can, and that the frequency of replacement of the pressurizing die is also low.

Method used

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  • Ni-plated steel sheet with excellent pressability for battery can
  • Ni-plated steel sheet with excellent pressability for battery can
  • Ni-plated steel sheet with excellent pressability for battery can

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] A steel plate having a plate thickness of 0.25 mm after cold-rolling with a low-carbon aluminum-killed hot-rolled coil and annealing was used. On the steel plate, the surface to be the outer surface of the battery can is plated with a thickness of 1.5g / m 2 Matte Ni plating.

[0121] In addition, 10g / m is applied to the surface that becomes the inner surface of the battery can 2 Matte Ni plating. After Ni plating, carry out continuous annealing at 700°C for 30 seconds to diffuse the Ni plating to form a Fe-Ni diffusion layer and a soft Ni layer thereon.

[0122] In addition, the Ni deposition amount of the Fe-Ni diffusion layer and the Ni layer thereon can be considered to be almost the same value as the deposition amount of the matte Ni plating layer before the diffusion treatment.

[0123] After the diffusion treatment, temper rolling was carried out so that the surface roughness Ra 2 obtained by a stylus type roughness measuring device became 0.3 μm with respect to...

Embodiment 2～12

[0128] In the same manner as in Example 1, Ni-plated steel sheets for battery cans of Examples 2 to 12 were formed.

[0129] However, in Examples 2 to 12, the matte Ni plating applied to the surface to be the outer surface of the battery can, and the surface to be the outer surface of the can formed by temper rolling were determined by a stylus type roughness measuring instrument. The surface roughness Ra2, the thickness of replating applied to the soft Ni layer, and the surface roughness Ra1 obtained by atomic force microscopy (AFM) after semi-bright Ni plating varied as shown in Table 2, respectively.

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PUM

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Abstract

Provided is a Ni-plated steel sheet which has excellent pressability and is highly inhibited from causing die wear and which gives an alkali battery that can retain the battery characteristics even after a lapse of time. The Ni-plated steel sheet for battery cans which has excellent pressability is characterized by having, on the surface corresponding to the outer surface of a battery can, an Fe-Ni diffusion layer and a Ni layer overlying the diffusion layer and further having a semi-glossy Ni deposit layer formed thereon, the amount of Ni deposited in the Fe-Ni diffusion layer and in the overlying Ni layer being equal to or less than the amount of the semi-glossy Ni deposit layer, and the amount of the semi-glossy Ni deposit layer being 2.25 g / m2 or more. The steel sheet is further characterized in that the surface of the semi-glossy Ni deposit layer has a surface roughness Ra1, determined through an examination of 2.5 [mu]m 2.5 [mu]m area with an atomic force microscope, in the range of 3-11 nm, and the surface roughness Ra of the semi-glossy Ni deposit layer includes a surface roughness Ra2, determined with a stylus type roughness meter, of 0.3-2.0 [mu]m.

Description

technical field [0001] The present invention relates to a Ni-plated steel sheet for battery cans that is excellent in pressurization properties and suppression of wear of dies. Background technique [0002] Conventionally, Ni-plated steel sheets have been widely used for battery cans, and the characteristics required for Ni-plated steel sheets for alkaline battery cans are excellent battery characteristics, corrosion resistance, and stable pressurization properties. Stable pressurization properties include no damage to the can during can production, no seizure on the mold, and the like. [0003] Therefore, as a characteristic of the material for cans, pressurability is an important factor in preventing stoppage of a press machine due to mold maintenance and improving productivity. [0004] Furthermore, when press-molding alkaline battery cans, it can be said that it is not cost-effective to not have a mold for 700,000 to 1,000,000 cans (shot). From the viewpoint of stable p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02C25D5/14C25D7/00H01M50/119H01M50/128H01M50/131
CPCY02E60/12C25D5/14H01M2/0257C25D7/00C25D3/12C25D5/50H01M2/0292C25D5/36H01M2/0287H01M2/0285Y02E60/10H01M50/124H01M50/1245C25D5/627C25D5/625C25D5/617C25D5/605C25D5/611H01M50/119H01M50/131H01M50/128C25D7/0614
Inventor 三奈木秀幸冈松荣次
Owner TOYO KOHAN CO LTD
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