| 摘要 |
PROBLEM TO BE SOLVED: To provide a square battery container superior in corrosion resistance to an electrolytic solution having a propylene carbonate salt of highly corrosive property as a main component. SOLUTION: This is a battery container in which a neck portion and a flange portion are formed at both end openings with no joint at side face, and a top lid and a bottom lid are double-wound fastened at the both end openings of the square barrel part. The square barrel part, the top lid, and the bottom lid are made of an aluminum sheet laminated with the following biaxially stretched polyester film at least on the inner face. In this case, the biaxially stretched polyester film has an X-ray diffraction strength ratio which satisfies 5≥I<SB>A</SB>/I<SB>B</SB>≥1, wherein, I<SB>A</SB>is an X-ray diffraction strength at a diffraction plane parallel to the polyester film of which plane distance is about 0.34 nm (CuKαX-ray diffraction angle is 24°to 28°), and I<SB>B</SB>is an X-ray diffraction strength at a diffraction plane parallel to the polyester film of which plane distance is about 0.39 nm (CuKαX-ray diffraction angle is 21.5°to 24°). COPYRIGHT: (C)2007,JPO&INPIT |
