| 摘要 |
PROBLEM TO BE SOLVED: To prevent liquid leakage after assembling a battery while improving corrosion resistance, lowering a rate of generation of crack by strong working such as deep drawing, and lowering the residual stress by using an austenitic stainless steel, including copper at a weight % in a specified range as a structural material for battery container. SOLUTION: As a structural material for battery container, austenitic stainless steel including 1.0-5.0 wt.% of copper is used. In order to restrict the working hardening characteristic of the austenitic group stainless steel, addition of copper has a large effect. Working hardening ratio is lowered by addition of 1.0 wt.% or more of copper and strong working such as deep drawing is facilitated. However, since addition of copper at a large quantity hinders toughness, welding property, hot working property and causes a cost increase. an upper limit of adding quantity is set at 5.0 wt.%. This container is used for oxyhalide - lithium battery having strong corrosion resistance. |
