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Preparation method of nickel-silver alloy steel strip for battery case

A technology of battery shell and alloy steel, which is applied in the direction of battery pack components, circuits, electrical components, etc. It can solve problems affecting the corrosion resistance of accessories, conductivity and weldability, and affect the internal resistance of the battery shell, so as to enhance corrosion resistance properties, reducing internal resistance, and strong antioxidant capacity

Inactive Publication Date: 2009-12-09
HUNAN TOYO LEED MATERIAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional nickel-plated steel strip only electrodeposits a nickel layer on the cold-rolled steel strip. Since the nickel layer is exposed to the air for a long time, an oxide film is easily formed on the surface, so when making the battery case, due to the existence of the oxide film , which affects the internal resistance of the battery case; in addition, due to the existence of oxide film, when used as hardware accessories, it will affect the corrosion resistance, conductivity, solderability and other properties of the accessories

Method used

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  • Preparation method of nickel-silver alloy steel strip for battery case
  • Preparation method of nickel-silver alloy steel strip for battery case

Examples

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example 1

[0023] The cold-rolled steel strip (low carbon steel strip) of Baosteel (produced by Baoshan Iron and Steel Company, brand BDCK) with a thickness of 0.25mm is selected as the electroplating substrate, and nickel plating is carried out after chemical degreasing, electrolytic degreasing and pickling (all traditional processes). → Silver plating → Heat treatment → Finish rolling.

[0024] Nickel plated

[0025] Nickel sulfate 280g / L, nickel chloride 40g / L, boric acid 45g / L, saccharin 0.5g / L, pH 4.0, temperature 50℃, current density 5A / dm 2 , the plating time is 1 minute, and the plating thickness is 1 μm.

[0026] silver

[0027] Silver nitrate 45g / L, Ammonium thiosulfate 250g / L, SL-80 additive (developed by Guangzhou Electrical Apparatus Institute) 10ml / L, auxiliary agent (developed by Guangzhou Electrical Apparatus Institute) 0.4ml / L, pH value 5.5, temperature 35℃, current density 0.8A / dm 2 , the plating time is 1 minute, and the plating thickness is 0.1 μm.

[0028] heat ...

example 2

[0035] The thickness of the nickel coating is 3 μm, and the plating time is 3 minutes; the thickness of the silver coating is 0.5 μm, and the plating time is 2.5 minutes; the steel strip with nickel-silver coating is sent to a bell furnace for heat treatment, the temperature is 250 ° C, and the holding time is 5 hours. A nickel-silver alloy layer with a thickness of 0.5 μm is formed between it and the silver layer, and the rest is the same as that of Example 1.

example 3

[0037] The thickness of the nickel coating is 5 μm, and the plating time is 5 minutes; the thickness of the silver coating is 1 μm, and the plating time is 5 minutes; the steel strip with nickel-silver coating is sent to the bell furnace for heat treatment, the temperature is 300 ° C, and the holding time is 10 hours. A nickel-silver alloy layer with a thickness of 2 μm was formed between the silver layers, and the rest were the same as in Example 1.

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Abstract

The invention discloses a preparation method of nickel-silver alloy steel strip for battery case. The method uses mild-carbon steel strip as substrate through chemical degreasing, electrolytic degreasing and acid cleaning, characterized by the following steps: A. putting the mild-carbon steel strip in nickel plating bath, plating for 1 to 5min to form nickel coating layer with the sediment thickness of single side or double-side of 1 to 5 microns; B. putting the steel strip plated with nickel layer in the silver plating bath for 0.5 to 5min, controlling the silver coating layer settled on the nickel coating layer to be 0.1 to 1.0 microns; C. thermal treatment, putting the steel strip of nickel-silver coating layer in a bell type furnace to process thermal treatment at 200 to 300 DEG C, keeping temperature for 1 to 10 hours, forming a nickel-silver alloy steel strip with thickness of 0.1 to 2.0 microns; and D. finish rolling, conveying the nickel-silver alloy steel strip with timeliness during the thermal treatment to finishing mill to roll. The invention is mainly used to prepare nickel-silver alloy steel strip for battery case.

Description

technical field [0001] The invention relates to a method for preparing a nickel-silver alloy steel strip, more particularly, to a method for preparing a nickel-silver alloy steel strip for battery casings. Background technique [0002] Nickel-silver alloy steel strip is a material in which nickel coating is first electrodeposited on the base of low carbon steel strip, and then silver coating is electrodeposited on one or both sides of the nickel layer. It is characterized by excellent corrosion resistance, electrical conductivity, solderability and resistance welding performance. [0003] The traditional nickel-plated steel strip only electrodeposits a nickel layer on the cold-rolled steel strip. Since the nickel layer is exposed to the air for a long time, an oxide film is easily formed on the surface. , and affect the internal resistance of the battery shell; in addition, due to the existence of oxide film, when used as hardware accessories, it will affect the corrosion r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12C25D5/50C21D8/02H01M2/02H01M50/119H01M50/124H01M50/145
CPCY02E60/12Y02E60/10
Inventor 肖才振宁文敏晏建明何海波
Owner HUNAN TOYO LEED MATERIAL SCI & TECH CO LTD
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