Battery can and battery using the same

Abstract

An Fe-Ni diffusion layer (3) is formed on the surface of a steel sheet (2) having an Fe content of not less than 98% by weight, while regulating the Fe / Ni ratio of the Fe-Ni diffusion layer (3) within the range of 0.1-2.5; and the resulting is formed into a battery can (1) having predetermined dimensions so that the Fe-Ni diffusion layer (3) serves as the inner surface of the can. When a battery is produced by using this battery can (1), the battery has excellent liquid leakage resistance by suppressing overdischarge erosion even when only a small amount of Ni is used therein.

Description

technical field [0001] The present invention relates to a battery can suitable for producing an aqueous solution-based battery such as an alkaline dry battery or a nickel-metal hydride storage battery, or a non-aqueous solution-based battery such as a lithium-ion secondary battery, and a battery using the battery can. Background technique [0002] Along with the diversification and higher functionality of portable electronic devices, batteries as their power sources are required to have higher reliability in addition to higher capacity and higher performance. Since batteries are mostly alkaline dry batteries using strong alkaline electrolytes and other batteries that use highly corrosive electrolytes, in order to prevent the battery cans from being corroded by the electrolyte and leaking, it is necessary to seal the battery on the inside of the battery can and on the base material. form a corrosion-resistant layer. In particular, when the battery can is composed of iron (he...

AI Technical Summary

Problems solved by technology

[0008] However, as shown in the above-mentioned prior art, even if only the Fe-Ni diffusion layer is formed, if pinholes can be formed on the surface of the Ni layer, the elution of Fe is easily carried out locally, and the above-mentioned local elution of Fe leads to pinhole-like holes reaching The outer surface of the battery can is pierced through, so that the electrolyte leaks from the hole, so it lacks leakage resistance

[0009] In addition, in the manufacturing process of the battery can and the battery using the battery can, the processing process of drawing or bending the sheet material is indispensable, and cracks may occur on the Ni plating layer formed on the surface of the sheet material during the processing process. or stripping etc.

[0010] In addition, there is another problem that it is difficult to suppress the production cost of the battery due to the increase in the amount of Ni used, which increases the price due to the increase in the demand, because the amount of Ni used is excessively increased.

Images