LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of suppressing a damage of a tab part.SOLUTION: A lithium ion secondary battery 1 comprises: at least a pair of electrodes 30 and 40; and a case 10 that houses the pair of electrodes 30 and 40. The electrode 30 includes: a collector 32; and a tab part 34 that is projected from the collector 32. The tab part 34 is folded in a folding line 36 extended in a direction crossing to a projection direction D1 of the tab part 34, and is connected to an inductive member 60 in a tip side than the folding line 36. The tab part 34 is formed by a rolled metal foil, and the folding line 36 is along with a rolling direction D2 of the metal foil.SELECTED DRAWING: Figure 3