| 摘要 |
In a battery, an electrode group (4) and an electrolyte are together sealed in a battery case (10). The electrode group (4) includes a positive electrode (1) and the negative electrode (2) which are wound or stacked with a separator (3) interposed therebetween. At least one of the positive electrode (1) and the negative electrode (2) includes a current collector (2A) and an active material layer (2B), and a lead (6) is electrically connected to an exposed portion (21) of the current collector (2A). The lead (6) is arranged to extend from the exposed portion (21) to the outside of the current collector (2A) such that the lead (6) straddles a first edge (21a) which is one of edges constituting the exposed portion (21), and is welded to the exposed portion (21) at a position close to the first edge (21a).
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