| 摘要 |
The secondary battery of this invention includes: an electrode assembly comprising a first electrode and a second electrode which are wound or laminated with only a heat-resistant porous insulating layer interposed between the first electrode and the second electrode; and a first current collector plate electrically connected to the first electrode. The first electrode includes a first electrode mixture layer formed on a first electrode core member. The second electrode includes a second electrode mixture layer formed on a second electrode core member. An end of the first electrode protrudes from an end of the second electrode and an end of the porous insulating layer at an end face of the electrode assembly. The protruding end of the first electrode has a part where the first electrode core member is exposed. The part where the first electrode core member is exposed is welded to the first current collector plate. The end of the porous insulating layer protrudes from an end of the first electrode mixture layer and an end of the second electrode mixture layer. The distance between the first current collector plate and the end of the porous insulating layer on the first current collector plate side is 3 mm or less.
|
