Patent ID: 8530079

Claim:
A rechargeable battery, comprising: an electrode group including a separator, a positive electrode, and a negative electrode; a case housing the electrode group; a cap plate for sealing the case, the cap plate including a terminal hole; an electrode terminal extending through the terminal hole; and a lead tab connecting the electrode terminal to the electrode group, the lead tab including: a horizontal part connected to the electrode terminal, a first vertical part and a second vertical part spaced apart from each other and extending from the horizontal part in a vertical direction along the electrode group, and a connection part connecting the first vertical part and the second vertical part, the connection part being spaced apart from the horizontal part to define a gas outlet that overlaps an end part of the electrode group, wherein: the end part includes edges of uncoated portions of the negative or positive electrodes, the first vertical part has a first surface facing the electrode group, the second vertical part has a second surface facing the electrode group, the first surface and the second surface face each other and are separated by a distance, and a width of the gas outlet is substantially equal to the distance.