Patent ID: 8603193

Claim:
A method for producing a prismatic secondary cell, the prismatic secondary cell including: a flat electrode assembly having such a shape that a core-body exposed portion of a first electrode and a core-body exposed portion of a second electrode having a different polarity from a polarity of the first electrode protrude from a pair of opposing first and second edges of the flat electrode assembly; a prismatic cell case housing the flat electrode assembly; a sealing plate for sealing the prismatic cell case; and an external output terminal inserted through a through hole provided in the sealing plate and protruding outwardly from an inside of the cell, the external output terminal being connected to the first electrode in a conductible manner, the method comprising: an A step of disposing a first current-collecting member onto a first to-be-welded portion set at a flat portion of the first edge of the electrode assembly from which the core-body exposed portion of the first electrode protrudes, and resistive-welding the first current-collecting member and the core-body exposed portion of the first electrode together from a direction substantially perpendicular to a plane of the core-body exposed portion of the first electrode; a B step of disposing a second current-collecting member onto a second to-be-welded portion set at a position of the flat portion, the position being distanced from the first to-be-welded portion so that the first current-collecting member and the second current-collecting member do not come into contact with one another, and resistive-welding the second current-collecting member and the core-body exposed portion of the first electrode together from the direction substantially perpendicular to the plane of the core-body exposed portion of the first electrode; and a C step of, after completion of the above two steps, connecting the first current-collecting member and the second current-collecting member to one another in a conductible manner directly or through a conductive connecting member other than the core-body exposed portion of the first electrode, wherein one of the first current-collecting member and the second current-collecting member protrudes from a third edge of the flat electrode assembly, the third edge being on the sealing plate side; and an other of the first current-collecting member and the second current-collecting member does not protrude from the third edge of the flat electrode assembly, the third edge being on the sealing plate side.