| abstract |
In a stacked battery, the width of a tab is made shorter than the length of the tab, thereby enhancing the manufacturability of electrode plates and suppressing temperature rise during discharge to provide a secondary battery having a high volume energy density, a large current, and a large capacity. The secondary battery has a stacked body and external terminals, wherein the stacked body is formed by alternately arranging: a first metal collector on which a negative electrode active material layer is formed; a negative electrode tab formed by extending a part of the negative electrode active material non-coated portion of the first metal collector; a separator for holding an electrolyte; a second metal collector on which a positive electrode active material layer is formed; and a positive electrode tab formed by extending a part of the positive electrode active material non-coated portion of the second metal collector. When the width dimension of the negative electrode tub is denoted by W', the width dimension of the positive electrode tub by W, the width dimension of a negative electrode collector plate by L', the width dimension of a positive electrode collector plate by L, the length of the negative electrode tab by T', and the length of the positive electrode tab by T, the secondary battery satisfies the following relationships:n45 > [(W/L) × 100] > 28 (1)n45 > [(W'/L') × 100] > 28 (2)nW/T > 1.8 (3)nW'/T' > 1.8 (4) |