Importance

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Abstract

A secondary battery includes an electrode wound body. The electrode wound body includes a stacked body including a positive electrode, a negative electrode, and a separator and wound along a longitudinal direction thereof, and has a through hole in a width direction. The positive electrode includes a positive electrode active material layer, and a positive electrode current collector including a positive electrode covered region and a positive electrode exposed region. The positive electrode covered region is covered with the positive electrode active material layer. The positive electrode exposed region is covered with no positive electrode active material layer and extends in the width direction from the positive electrode active material layer. The positive electrode active material layer includes a first thin part, and a first thick part having a thickness greater than that of the first thin part and being adjacent to the first thin part in the width direction.

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First Claim