| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of internal short-circuiting while securing an excellent charge/discharge performance and a high energy density in a square battery having a laminated structure suitable for a large-sized square battery.SOLUTION: A square battery (C) includes: a positive electrode collector (3) and a negative electrode collector (5) which are oppositely disposed in parallel with each other and formed tabular; a plurality of tabular positive electrode bodies (13) which are formed by fixing a positive electrode mixture containing a cathode active material to a porous metallic substrate and disposed in contact substantially orthogonal to the positive electrode collector; and a plurality of tabular negative electrode bodies (15) which are disposed between the plurality of positive electrode bodies oppositely to the positive electrode bodies with pleats-like separators (11) therebetween and disposed in contact substantially orthogonally to the negative electrode collector. In an end portion of the positive electrode body at a side confronting a folded part of the separator, a sheet-like member (21) formed from an insulative material is provided which covers an end face, a corner formed between the end face and both principal surfaces, and a portion of both the principal surfaces continued to the corner. |
