A secondary battery includes an electrode assembly. The electrode assembly includes a first electrode plate provided with a first tab portion, a second electrode plate provided with a second tab portion, and a separator interposed between the electrode plates. In the electrode assembly, the width of the first or second tab portion is in the range from over 0.5 of the half of the width of each of the electrode plates to below the half of the width of each of the electrode plates, and the first or second tab portion is provided to have a spacing distance b from a central portion of the first or second electrode plate to a starting portion of the first or second tab portion. The spacing distance is in the range from over 0 mm to less than half of the half (¼) of the width of the first or second electrode plate.