| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a secondary battery capable of improving productivity as well as simplifying an assembling process without increasing the number of components.SOLUTION: An insulation sheet 5 includes: a pair of first insulation sheets 15 and 16 interposed between a pair of metal foil exposed portions 41c and 42c which are formed at both ends of an electrode group 40 in a winding axis direction D and a battery can 4; and a second insulation sheet 14 which is thinner than the first insulation sheets 15 and 16, extends over between the pair of first insulation sheets 15 and 16 to be interposed between a mixture layer laminated region 40d and a battery can 4, and overlaps the first insulation sheets 15 and 16 between a pair of conductive portions 41c and 42c and the battery can 4. At least a part overlapping each other of the first insulation sheets 15 and 16 and the second insulation sheet 14 are connected with each other through thermal welding.</p> |
