| 摘要 |
A lithium-ion secondary battery comprising a positive electrode with a comb-like shaped positive electrode lead piece (2), a negative electrode with a comb-like shaped negative electrode lead piece (3), an electrode assembly in which said positive and negative electrodes are rolled up interposing a separator therebetween, and said positive and negative electrode lead pieces (2;3) are directed in the mutually opposite directions at opposite sides of said electrodes, said positive electrode lead piece (2) being joined to an outer periphery part a ring-like shaped positive electrode collector (11), a ring-like shaped negative electrode collector (5) disposed on the other end side of said electrode assembly at the opposite position to said positive electrode collector (11), said negative electrode lead piece (3) being joined to an outer periphery part of a ring-like shaped negative electrode collector (5), a battery lid (13) for sealing a battery container (7) via a gasket (15), and an insulator (10) laid over at least extent from the outer surface of said positive or negative electrode collector (5,11) disposed between said electrode assembly and said battery lid (13) so as to cover said positive or negative electrode lead piece (2;3). |
