| 摘要 |
A battery case houses an electrode group formed by winding a positive electrode plate where a positive electrode active material layer is provided on a positive electrode current collector and a negative electrode plate where a negative electrode active material layer is provided on a negative electrode current collector with a porous insulating layer interposed therebetween. The current collectors are made of metal foil of an identical material. An end of the positive electrode current collector has a first exposed portion provided with no positive electrode active material layer. An end of the negative electrode current collector has a second exposed portion provided with no negative electrode active material layer. The exposed portions and project from the porous insulating layer in opposite directions. The first and second exposed portions and are connected to positive and negative electrode current collector plates, respectively.
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