Patent ID: 8142922

Claim:
A method for manufacturing a secondary battery including an electrode group having a positive electrode plate and a negative electrode plate arranged with a porous insulating layer interposed therebetween, the method comprising the steps of: (a) preparing the electrode group having the positive electrode plate and the negative electrode plate arranged in such a manner that the porous insulating layer is interposed therebetween and an end portion of at least one of the positive and negative electrode plates protrudes from the porous insulating layer; (b) preparing a current collector plate provided with a projection formed on one principle surface of the current collector plate and having a gap thereinside; (c) bringing the end portion of the electrode plate protruding from the porous insulating layer into contact with the other principle surface of the current collector plate; and (d) joining the end portion of the electrode plate to the current collector plate by locally heating the projection, wherein the end portion of the electrode plate is welded to the current collector plate in the step (d) with a fused material obtained by fusing the projection.