| 摘要 |
A battery comprising an electricity-generating element comprising a strip-form positive electrode, a strip-form negative electrode, and a strip-form separator, said positive electrode and said negative electrode being spirally wound through said separator and said positive electrode and said negative electrode respectively having current collecting lugs protruding from a side thereof, wherein the pitches of the current collecting lugs become longer toward the outer periphery side, and the at least one current collecting lug that located on the outer side has a larger width than that located on the inner side. In this battery, the electricity-generating element has at least one current collecting lug which has a larger width than the adjacent current collecting lug located on the inner side thereof. Consequently, although the current collecting lugs in an outer region are located at a longer pitch and the area to be covered by each current collecting lug in that region is wide, charge/discharge current can sufficiently flow through the active material throughout the whole area in that region. Therefore, charge/discharge current can evenly flow through the electrodes including their inner and outer parts, whereby the active materials can have an even reaction distribution.
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