| 摘要 |
The present invention provides a battery in which, when a flat wound electrode assembly abnormally generates heat, a short-circuit can be appropriately prevented from occurring on the positive electrode protrusion wound portion side (one side of an axial line) of the positive electrode innermost circumference curved portion of the electrode assembly. According to the present invention, a flat electrode assembly (30) of a battery (10) has a one-side curved end (30f) positioned on one side (GA) of the electrode assembly width direction (GH) and an other-side curved end (30g) positioned on the other side (GB) thereof. A positive electrode innermost circumference curved portion (31r) of a positive electrode plate (31) is disposed inside the one-side curved end (30f). When the dimension from a positive electrode connection portion (30cj) to the end (30ft) on the one side (GA) of the electrode assembly is defined as a distance (Ha) and the dimension from the positive electrode connection portion to the end (30gt) on the other side (GB) of the electrode assembly is defined as a distance (Hb), the positive electrode connection portion (30cj) being in the positive electrode protrusion wound portion (30c) of the electrode assembly and connected to the terminal connection portion (61j) of a positive electrode terminal member (60), the terminal connection portion is connected to the positive electrode connection portion at a position satisfying the condition Ha ‰¥ 1.1Hb. |
