Patent ID: 9601781
Date: 2017-03-21
CPC Classifications: B23K,H01M,Y02E,Y02P

Claim:
1. A method for manufacturing a secondary battery including: an electrode laminated body formed of laminated electrode sheets each including a collector foil partially formed with an active material layer; and a collector member bonded to a collector foil laminated portion formed of a part of the electrode sheet, the part being unformed with the active material layer, wherein the method includes bonding the collector foil laminated portion to the collector member by resistance welding in which the collector foil laminated portion and the collector member are placed so that respective portions to be bonded overlap each other, the portions are clamped from both sides between resistance welding electrodes while the portions are being held in pressure contact, and an electric current is passed between the resistance welding electrodes, and wherein when the pressure contact direction is a projection direction, a projected area Xd of a contact surface of the resistance welding electrode, having a rounded tip, for pressing a surface of the collector foil laminated portion to the collector foil laminated portion and a projected area Yd of a contact surface of the resistance welding electrode for pressing the surface of the collector member to the collector member, an area ratio Yd/Xd is set within a range of 1.2 to 4 inclusive.