Patent ID: 9728787
Date: 2017-08-08
CPC Classifications: H01M,Y02E,Y02P

Claim:
1. A current collecting structure for a secondary battery including an electrode group including a plurality of electrodes each having a tab and stacked via a separator, the current collecting structure comprising: a plurality of current collecting plates to which the tabs of the electrodes of the same polarity are welded; and a terminal including a terminal body portion to which the current collecting plates are attached, and a terminal portion, the plurality of current collecting plates each including a fixed portion and a welded portion onto which the tabs are welded in an overlapping manner, wherein the fixed portions of the current collecting plates are stacked to form a current collecting plate stacking portion to be fixed to the terminal body portion, the plurality of current collecting plates being each bent so as to form a bent portion having a predetermined angle between the fixed portion and the welded portion, wherein: the plurality of current collecting plates are divided into a first divided group located closer to the terminal body portion and a second divided group located farther from the terminal body portion; the welded portion of each current collecting plate belonging to the first divided group is bent toward the terminal body portion between the fixed portion and the welded portion, and predetermined angle for the bent portions of the current collecting plates belonging to the first divided group is determined such that the predetermined angle of the bent portion of one of two adjacent current collecting plates that is located closer to the terminal body portion is smaller than the predetermined angle of the bent portion of the other current collecting plate that is located farther from the terminal body portion; and the welded portion of each current collecting plate belonging to the second divided group is bent away from the terminal body portion between the fixed portion and the welded portion, and the predetermined angle for the bent portions of the current collecting plates belonging to the second divided group is determined such that the predetermined angle of the bent portion of one of two adjacent current collecting plates that is located closer to the terminal body portion is larger than the predetermined angle of the bent portion of the other current collecting plate that is located farther from the terminal body portion.